Structural characteristics of temperature and humidity control test chamber
Suitable for various small electrical appliances, instruments, materials, and components for wet heat testing, it is also suitable for conducting aging tests. This test chamber adopts the most reasonable structure and stable and reliable control method currently available, making it aesthetically pleasing, easy to operate, safe, and with high precision in temperature and humidity control. It is an ideal equipment for conducting constant temperature and humidity tests.
(1) The test box body is in the form of an integral structure, with the refrigeration system located at the lower rear of the box and the control system located at the upper part of the test box.
(2) Inside the air duct interlayer at one end of the studio, there are devices such as heaters, refrigeration evaporators, and fan blades distributed; On the left side of the test box, there is a Ø 50 cable hole, and the test box is a single door (stainless steel embedded door handle)
(3) The double-layer high temperature and anti-aging silicone rubber seal can effectively ensure the temperature loss of the test chamber
(4) There are observation windows, frost prevention devices, and switchable lighting fixtures on the box door. The observation window adopts multi-layer hollow tempered glass, and the inner adhesive sheet conductive film is heated and defrosted. The lighting fixtures adopt imported brand Philips lamps, which can effectively observe the experimental changes in the studio from all angles.
The refrigeration cycle of the temperature and humidity control box adopts the reverse Carnot cycle, which consists of two isothermal processes and two adiabatic processes. The process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, and the work consumed increases the exhaust temperature. Then, the refrigerant exchanges heat with the surrounding medium through the condenser and transfers heat to the surrounding medium. After the refrigerant undergoes adiabatic expansion through the shut-off valve, the temperature of the refrigerant decreases. Finally, the refrigerant absorbs heat from the object at a higher temperature through the evaporator, causing the temperature of the cooled object to decrease. This cycle repeats itself to achieve the goal of cooling down.
The refrigeration system design of this test chamber applies energy regulation technology, which can ensure the normal operation of the refrigeration unit and effectively adjust the energy consumption and refrigeration capacity of the refrigeration system, so as to maintain the refrigeration system in the optimal operating state. By using Balanced Temperature Control (BTC), the control system automatically calculates the output of the heater based on the set temperature point through PID calculation when the refrigeration system is working continuously, ultimately achieving a dynamic balance.
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Hello, our company is a high-quality development team with strong technical strength, providing high-quality products, complete solutions, and excellent technical services to our customers. The main products include walk-in constant temperature and humidity testing chambers, UV accelerated aging testing machines, rapid temperature change testing chambers, walk-in environmental testing chambers, UV aging testers, constant temperature and humidity chambers, etc. Our company adheres to the principle of building a business with integrity, maintaining quality, and striving for progress. With a more determined pace, we continuously climb new heights and contribute to the national automation industry. We welcome new and old customers to confidently choose the products they like. We will serve you wholeheartedly!
Service conditions for high, low temperature, and low pressure test chambers
One of the usage conditions for high, low temperature, and low pressure test chambers: environmental conditions
a、 Temperature: 15 ℃~35 ℃;
b、 Relative humidity: not exceeding 85%;
c、 Atmospheric pressure: 80kPa~106kPa
d、 There is no strong vibration or corrosive gas in the surrounding area;
e、 No direct sunlight exposure or direct radiation from other cold or heat sources;
f、 There is no strong airflow around, and when the surrounding air needs to be forced to flow, the airflow should not be directly blown onto the box;
g、 The influence of magnetic field on the control circuit of the interference free test box in the surrounding area;
h、 There is no high concentration of dust or corrosive substances in the surrounding area.
Condition 2 for the use of high, low temperature, and low pressure test chambers: Power supply conditions
a、 AC voltage: 220V ± 22V or 380V ± 38V;
b、 Frequency: 50HZ ± 0.5HZ
Condition Three for the Use of High, Low Temperature, and Low Pressure Test Chambers: Water Supply Conditions
It is advisable to use tap water or circulating water that meets the following conditions:
a、 Water temperature: not higher than 30 ℃;
b、 Water pressure: 0.1MPa~0.3MPa;
c、 Water quality: meets industrial water standards.
Condition 4 for the use of high, low temperature, and low pressure test chambers: Test load conditions
The load of the test chamber should meet the following conditions every week:
a、 The total mass of the load shall not exceed 80KG per cubic meter within the working chamber volume
b、 The total volume of the load shall not exceed 5/1 of the working chamber volume
c、 On any cross-section perpendicular to the prevailing wind direction, the sum of the load areas should not exceed 3/1 of the cross-sectional area of the working chamber at that location, and the load should not obstruct the flow of airflow when placed.
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Our company has products such as rapid temperature change test chambers, UV accelerated weather resistance testing machines, and temperature and humidity control chambers. You can call our service hotline through our website to learn more about our products. Our pursuit is endless, and we welcome new and old customers to choose their favorite products with confidence. We will be dedicated to serving you!
User selection environment test box must read
1、 Equipment selection criteria
There is currently no exact number of natural environmental factors and induced environmental factors that exist on the surface of the Earth and in the atmosphere, among which there are no less than a dozen factors that have a significant impact on the use and lifespan of engineering products (equipment). Engineers engaged in the study of environmental conditions for engineering products have compiled and summarized the environmental conditions that exist in nature and are induced by human activities into a series of testing standards and specifications to guide the environmental and reliability testing of engineering products. For example, GJB150- the National Military Standard of the People's Republic of China for Environmental Testing of Military Equipment, and GB2423- the National Standard of the People's Republic of China for Environmental Testing of Electrical and Electronic Products, which guides environmental testing of electrical and electronic products. Therefore, the main basis for selecting environmental and reliability testing equipment is the testing specifications and standards of engineering products.
Secondly, in order to standardize the tolerance of environmental testing conditions in experimental equipment and ensure the control accuracy of environmental parameters, national technical supervision agencies and various industrial departments have also formulated a series of calibration regulations for environmental testing equipment and detection instruments. Such as the national standard GB5170 of the People's Republic of China "Basic Parameter Calibration Method for Environmental Testing Equipment of Electrical and Electronic Products", and JJG190-89 "Trial Calibration Regulations for Electric Vibration Test Stand System" issued and implemented by the State Administration of Technical Supervision. These verification regulations are also an important basis for selecting environmental and reliability testing equipment. Testing equipment that does not meet the requirements of these verification regulations is not allowed to be put into use.
2、 Basic principles for equipment selection
The selection of environmental and reliability testing equipment should follow the following five basic principles:
1. Reproducibility of environmental conditions
It is impossible to fully and accurately reproduce the environmental conditions that exist in nature in the laboratory. However, within a certain tolerance range, people can accurately and approximately simulate the external environmental conditions that engineering products undergo during use, storage, transportation, and other processes. This passage can be summarized in engineering language as follows: "The environmental conditions (including platform environment) created by the testing equipment around the tested product should meet the requirements of the environmental conditions and their tolerances specified in the product testing specifications. The temperature box used for military product testing should not only meet the requirements of the national military standards GJB150.3-86 and GJB150.4-86 for different uniformity and temperature control accuracy. Only in this way can the reproducibility of environmental conditions be ensured in environmental testing.
2. Repeatability of environmental conditions
An environmental testing equipment may be used for multiple tests of the same type of product, and a tested engineering product may also be tested in different environmental testing equipment. In order to ensure the comparability of test results obtained for the same product under the same environmental testing conditions specified in the testing specifications, it is necessary to require the environmental conditions provided by the environmental testing equipment to be reproducible. This means that the stress levels (such as thermal stress, vibration stress, electrical stress, etc.) applied by environmental testing equipment to the tested product are consistent with the requirements of the same testing specification.
The repeatability of environmental conditions provided by environmental testing equipment is guaranteed by the national metrological verification department after passing the verification according to the verification regulations formulated by the national technical supervision agency. Therefore, it is necessary to require environmental testing equipment to meet the requirements of various technical indicators and accuracy indicators in the calibration regulations, and to not exceed the time limit specified in the calibration cycle in terms of usage time. If a very common electric vibration table is used, in addition to meeting technical indicators such as excitation force, frequency range, and load capacity, it must also meet the requirements of precision indicators such as lateral vibration ratio, table acceleration uniformity, and harmonic distortion specified in the calibration regulations. Moreover, the service life after each calibration is two years, and after two years, it must be re calibrated and qualified before being put into use.
3. Measurability of environmental condition parameters
The environmental conditions provided by any environmental testing equipment must be observable and controllable. This is not only to limit the environmental parameters within a certain tolerance range and ensure the reproducibility and repeatability of the test conditions, but also necessary for the safety of product testing, in order to prevent damage to the tested product caused by uncontrolled environmental conditions and unnecessary losses. At present, various experimental standards generally require that the accuracy of parameter testing should not be less than one-third of the allowable error under experimental conditions.
4. Exclusion of environmental testing conditions
Every time an environmental or reliability test is conducted, there are strict regulations on the category, magnitude, and tolerance of environmental factors, and non test required environmental factors are excluded from penetrating into it, in order to provide a definite basis for judging and analyzing product failure and fault modes during or after the test. Therefore, it is required that environmental testing equipment not only provide the specified environmental conditions, but also not allow any other environmental stress interference to be added to the tested product. As defined in the verification regulations for electric vibration tables, the table leakage magnetic flux, acceleration signal-to-noise ratio, and total root mean square value ratio of in band and out of band acceleration. The accuracy indicators such as random signal verification and harmonic distortion are all established as verification items to ensure the uniqueness of environmental testing conditions.
5. Safety and reliability of experimental equipment
Environmental testing, especially reliability testing, has a long testing cycle and sometimes targets high-value military products. During the testing process, testing personnel often need to operate, inspect or test around the site. Therefore, it is required that environmental testing equipment must have the characteristics of safe operation, convenient operation, reliable use, and long working life to ensure the normal progress of the testing itself. The various protection, alarm measures, and safety interlock devices of the testing equipment should be complete and reliable to ensure the safety and reliability of the testing personnel, the tested products, and the testing equipment itself.
3、 Selection of Temperature and Humidity Chamber
1. Selection of Capacity
When placing the test product (components, assemblies, parts or whole machine) into a climate chamber for testing, in order to ensure that the atmosphere around the test product can meet the environmental testing conditions specified in the test specifications, the working dimensions of the climate chamber and the overall dimensions of the test product should follow the following regulations:
a) The volume of the tested product (W × D × H) shall not exceed (20-35)% of the effective working space of the test chamber (20% is recommended). For products that generate heat during testing, it is recommended to use no more than 10%.
b) The ratio of the windward cross-sectional area of the tested product to the total area of the test chamber on that section shall not exceed (35-50)% (35% is recommended).
c) The distance between the outer surface of the tested product and the wall of the test chamber should be kept at least 100-150mm (recommended 150mm).
The above three provisions are actually interdependent and unified. Taking a 1 cubic meter cube box as an example, an area ratio of 1: (0.35-0.5) is equivalent to a volume ratio of 1: (0.207-0.354). A distance of 100-150mm from the box wall is equivalent to a volume ratio of 1: (0.343-0.512).
In summary, the working chamber volume of the climate environment test chamber should be at least 3-5 times the external volume of the tested product. The reasons for making such regulations are as follows:
After the test piece is placed in the box, it occupies the smooth channel, and narrowing the channel will lead to an increase in airflow velocity. Accelerate the heat exchange between the airflow and the test piece. This is inconsistent with the reproduction of environmental conditions, as relevant standards stipulate that the air flow velocity around the test specimen in the test chamber should not exceed 1.7m/s for temperature environmental tests, in order to prevent the test specimen and the surrounding atmosphere from generating heat conduction that is not in line with reality. When unloaded, the average wind speed inside the test chamber is 0.6-0.8m/s, not exceeding 1m/s. When the space and area ratio specified in points a) and b) are met, the wind speed in the flow field may increase by (50-100)%, with an average maximum wind speed of (1-1.7) m/s. Meet the requirements specified in the standards. If the volume or windward cross-sectional area of the test piece is increased without restrictions during the experiment, the actual airflow speed during the test will exceed the maximum wind speed specified in the test standard, and the validity of the test results will be questioned.
The accuracy indicators of environmental parameters in the working chamber of the climate chamber, such as temperature, humidity, salt spray settling rate, etc., are all measured under no-load conditions. Once the test piece is placed, it will have an impact on the uniformity of the environmental parameters in the working chamber of the test chamber. The larger the space occupied by the test piece, the more severe this impact will be. Experimental data shows that the temperature difference between the windward and leeward sides in the flow field can reach 3-8 ℃, and in severe cases, it can be as high as 10 ℃ or more. Therefore, it is necessary to meet the requirements of a] and b] as much as possible to ensure the uniformity of environmental parameters around the tested product.
According to the principle of heat conduction, the temperature of the airflow near the box wall is usually 2-3 ℃ different from the temperature at the center of the flow field, and may even reach 5 ℃ at the upper and lower limits of high and low temperatures. The temperature of the box wall differs from the temperature of the flow field near the box wall by 2-3 ℃ (depending on the structure and material of the box wall). The greater the difference between the test temperature and the external atmospheric environment, the greater the temperature difference. Therefore, the space within a distance of 100-150mm from the box wall is unusable.
2. Selection of temperature range
At present, the range of temperature test chambers abroad is generally -73 to+177 ℃, or -70 to+180 ℃. Most domestic manufacturers generally operate at -80 to+130 ℃, -60 to+130 ℃, -40 to+130 ℃, and there are also high temperatures up to 150 ℃. These temperature ranges can usually meet the temperature testing needs of the vast majority of military and civilian products in China. Unless there are special requirements, such as products installed near heat sources such as engines, the upper temperature limit should not be blindly increased. Because the higher the upper limit temperature, the greater the temperature difference between the inside and outside of the box, and the poorer the uniformity of the flow field inside the box. The smaller the available studio size. On the other hand, the higher the upper limit temperature value, the higher the heat resistance requirements for insulation materials (such as glass wool) in the interlayer of the box wall. The higher the requirement for the sealing of the box, the higher the production cost of the box.
3. Selection of humidity range
The humidity indicators given by domestic and foreign environmental test chambers are mostly 20-98% RH or 30-98% RH. If the humid heat test chamber does not have a dehumidification system, the humidity range is 60-98%. This type of test chamber can only perform high humidity tests, but its price is much lower. It is worth noting that the corresponding temperature range or minimum dew point temperature should be indicated after the humidity index. Because relative humidity is directly related to temperature, for the same absolute humidity, the higher the temperature, the lower the relative humidity. For example, if the absolute humidity is 5g/Kg (referring to 5g of water vapor in 1kg of dry air), when the temperature is 29 ℃, the relative humidity is 20% RH, and when the temperature is 6 ℃, the relative humidity is 90% RH. When the temperature drops below 4 ℃ and the relative humidity exceeds 100%, condensation will occur inside the box.
To achieve high temperature and high humidity, simply spray steam or atomized water droplets into the air of the box for humidification. Low temperature and humidity are relatively difficult to control because the absolute humidity at this time is very low, sometimes much lower than the absolute humidity in the atmosphere. It is necessary to dehumidify the air flowing inside the box to make it dry. At present, the vast majority of temperature and humidity chambers both domestically and internationally adopt the principle of refrigeration and dehumidification, which involves adding a set of refrigeration light pipes to the air conditioning room of the chamber. When humid air passes through a cold pipe, its relative humidity will reach 100% RH, as the air saturates and condenses on the light pipe, making the air drier. This dehumidification method theoretically can reach dew point temperatures below zero degrees, but when the surface temperature of the cold spot reaches 0 ℃, the water droplets condensed on the surface of the light pipe will freeze, affecting the heat exchange on the surface of the light pipe and reducing the dehumidification capacity. Also, because the box cannot be completely sealed, humid air from the atmosphere will seep into the box, causing the dew point temperature to rise. On the other hand, the moist air flowing between the light tubes only reaches saturation at the moment of contact with the light tubes (cold spots) and releases water vapor, so this dehumidification method is difficult to keep the dew point temperature inside the box below 0 ℃. The actual minimum dew point temperature achieved is 5-7 ℃. A dew point temperature of 5 ℃ is equivalent to an absolute moisture content of 0.0055g/Kg, corresponding to a relative humidity of 20% RH at a temperature of 30 ℃. If a temperature of 20 ℃ and a relative humidity of 20% RH are required, with a dew point temperature of -3 ℃, it is difficult to use refrigeration for dehumidification, and an air drying system must be selected to achieve it.
4. Selection of control mode
There are two types of temperature and humidity test chambers: constant test chamber and alternating test chamber.
The ordinary high and low temperature test chamber generally refers to a constant high and low temperature test chamber, which is controlled by setting a target temperature and has the ability to automatically maintain a constant temperature to the target temperature point. The control method of the constant temperature and humidity test chamber is also similar, setting a target temperature and humidity point, and the test chamber has the ability to automatically maintain a constant temperature to the target temperature and humidity point. The high and low temperature alternating test chamber has one or more programs for setting high and low temperature changes and cycles. The test chamber has the ability to complete the test process according to the preset curve, and can accurately control the heating and cooling rates within the maximum heating and cooling rate capability range, that is, the heating and cooling rates can be controlled according to the slope of the set curve. Similarly, the high and low temperature alternating humidity test chamber also has preset temperature and humidity curves, and the ability to control them according to the preset. Of course, alternating test chambers have the function of constant test chambers, but the manufacturing cost of alternating test chambers is relatively high because they need to be equipped with curve automatic recording devices, program controllers, and solve problems such as turning on the refrigeration machine when the temperature in the working room is high. Therefore, the price of alternating test chambers is generally more than 20% higher than that of constant test chambers. Therefore, we should take the need for experimental methods as the starting point and choose a constant test chamber or an alternating test chamber.
5. Selection of variable temperature rate
Ordinary high and low temperature test chambers do not have a cooling rate indicator, and the time from the ambient temperature to the nominal lowest temperature is generally 90-120 minutes. The high and low temperature alternating test chamber, as well as the high and low temperature alternating wet heat test chamber, both have temperature change speed requirements. The temperature change speed is generally required to be 1 ℃/min, and the speed can be adjusted within this speed range. The rapid temperature change test chamber has a fast temperature change rate, with heating and cooling rates ranging from 3 ℃/min to 15 ℃/min. In certain temperature ranges, the heating and cooling rates can even reach over 30 ℃/min.
The temperature range of various specifications and speeds of rapid temperature change test chambers is generally the same, that is, -60 to+130 ℃. However, the temperature range for assessing the cooling rate is not the same. According to different test requirements, the temperature range of rapid temperature change test chambers is -55 to+80 ℃, while others are -40 to+80 ℃.
There are two methods for determining the temperature change rate of the rapid temperature change test chamber: one is the average temperature rise and fall rate throughout the entire process, and the other is the linear temperature rise and fall rate (actually the average speed every 5 minutes). The average speed throughout the entire process refers to the ratio of the difference between the highest and lowest temperatures within the temperature range of the test chamber to the time. At present, the technical parameters of temperature change rate provided by various environmental testing equipment manufacturers abroad refer to the average rate throughout the entire process. The linear temperature rise and fall rate refers to the guaranteed temperature change rate within any 5-minute time period. In fact, for the rapid temperature change test chamber, the most difficult and critical stage to ensure the linear temperature rise and fall speed is the cooling rate that the test chamber can achieve during the last 5 minutes of the cooling period. From a certain perspective, the linear heating and cooling speed (average speed every 5 minutes) is more scientific. Therefore, it is best for the experimental equipment to have two parameters: the average temperature rise and fall speed throughout the entire process and the linear temperature rise and fall speed (average speed every 5 minutes). Generally speaking, the linear heating and cooling speed (average speed every 5 minutes) is half of the average heating and cooling speed throughout the entire process.
6. Wind speed
According to relevant standards, the wind speed inside the temperature and humidity chamber during environmental testing should be less than 1.7m/s. For the test itself, the lower the wind speed, the better. If the wind speed is too high, it will accelerate the heat exchange between the surface of the test piece and the airflow inside the chamber, which is not conducive to the authenticity of the test. But in order to ensure uniformity within the testing chamber, it is necessary to have circulating air inside the testing chamber. However, for rapid temperature change test chambers and comprehensive environmental test chambers with multiple factors such as temperature, humidity, and vibration, in order to pursue the rate of temperature change, it is necessary to accelerate the flow velocity of the circulating airflow inside the chamber, usually at a speed of 2-3m/s. Therefore, the wind speed limit varies for different usage purposes.
7. Temperature fluctuation
Temperature fluctuation is a relatively easy parameter to implement, and most test chambers produced by environmental testing equipment manufacturers can actually control temperature fluctuations within a range of ± 0.3 ℃.
8. Uniformity of temperature field
In order to simulate the actual environmental conditions that products experience in nature more accurately, it is necessary to ensure that the surrounding area of the tested product is under the same temperature environment conditions during environmental testing. Therefore, it is necessary to limit the temperature gradient and temperature fluctuation inside the test chamber. In the General Principles of Environmental Test Methods for Military Equipment (GJB150.1-86) of the National Military Standard, it is clearly stipulated that "the temperature of the measurement system near the test sample should be within ± 2 ℃ of the test temperature, and its temperature should not exceed 1 ℃/m or the total maximum value should be 2.2 ℃ (when the test sample is not working).
9. Precision control of humidity
The humidity measurement in the environmental testing chamber mostly adopts the dry wet bulb method. The manufacturing standard GB10586 for environmental testing equipment requires that the relative humidity deviation should be within ± 23% RH. To meet the requirements of humidity control accuracy, the temperature control accuracy of the humidity test chamber is relatively high, and the temperature fluctuation is generally less than ± 0.2 ℃. Otherwise, it will be difficult to meet the requirements for humidity control accuracy.
10. Cooling method selection
If the test chamber is equipped with a refrigeration system, the refrigeration system needs to be cooled. There are two forms of test chambers: air-cooled and water-cooled.
Forced air cooling
Water-cooling
Working conditions
The equipment is easy to install, only need to power on.
The ambient temperature should be lower than 28℃. If the ambient temperature is higher than 28℃, it has a certain impact on the refrigeration effect (preferably with air conditioning), the circulating cooling water system should be configured.
Heat exchange effect
Poor (relative to the water-cooling mode)
Stable, good
Noise
Large (relative to the water-cooling mode)
Less
The walk-in high and low temperature (humid and hot) laboratory also needs maintenance
Reminder: Remember to maintain the walk-in high and low temperature (humid and hot) laboratory as well!
1. The temperature and humidity testing system of the walk-in high and low temperature (humid and hot) laboratory must be operated and maintained by a dedicated person. Strictly follow the operating procedures of the system and avoid others from operating the system illegally.
2. Long term shutdown of the walk-in high and low temperature (humid and hot) laboratory can affect the effective service life of the system. Therefore, the system should be turned on and operated at least once every 10 days; Do not repeatedly stop the system in a short period of time. The number of starts per hour should be less than 5 times, and the time interval between each start stop should not be less than 3 times; Do not open the door of the walk-in temperature and humidity testing system at low temperatures to prevent damage to the door sealing tape.
3. A system usage file should be established to facilitate system maintenance and repair. The use of archives should record the start and end time (date) of each system operation, the type of experiment, and the ambient temperature; When the system malfunctions, provide a detailed description of the fault phenomenon as much as possible; The maintenance and repair of the system should also be recorded in as much detail as possible.
4. Conduct a monthly main power switch (leakage circuit breaker) operation test to ensure that the switch is used as a leakage protector while meeting the load capacity. The specific steps are as follows: first, please confirm that the main power switch is turned to "ON", which means the system is powered on, and then press the test button. If the switch lever of the residual current circuit breaker falls down, this function is normal.
5. The main box of the walk-in temperature and humidity testing system should be protected during use and should not be subjected to strong impacts from sharp or blunt objects.
6. To ensure the normal and clean supply of cooling water, the cooling water filter of the refrigeration unit should be cleaned every 30 days. If the local air quality is poor and the dust content in the air is high, the cooling water tower reservoir should generally be cleaned every 7 days.
7. The leakage, overload, and short-circuit protection characteristics of the residual current switch are set by Lab Companion manufacturer and cannot be adjusted arbitrarily during use to avoid affecting performance; After the leakage switch is disconnected due to a short circuit, the contacts need to be checked. If the main contacts are severely burned or have pits, maintenance is required.
8. The test products placed in the walk-in temperature and humidity testing system should be kept at a certain distance from the suction and exhaust ports of the air conditioning channel to avoid obstructing air circulation.
9. Overtemperature protector action test. Set the temperature of the over temperature protector to be lower than the temperature of the box. If there is an E0.0 alarm and buzzing sound, it indicates that its function is normal. After completing the above experiment, the temperature protection setting should be reset appropriately, otherwise it may cause inappropriate termination.
10. Once a year, use a vacuum cleaner to clean and remove dust from the distribution room and water circuit room. Once a month, use a dry cloth to clean the accumulated water in the water tray of the refrigeration unit.
EC-85MHPM-W, Tanque de temperatura y humedad constante correspondiente a carga alta (800 L)ProyectoTipoSerieＭＨＰＭ－ＷFunciónModo de temperatura y humedad.El camino de la pelota mojadarango de temperatura-40 ～ + 100 ℃Rango de humedad20 ~ 98% HR(Según la anafase 3 ítems)Cambios de temperatura y humedad.± 0,3 ℃ ／ ±2,5% HRDistribución de temperatura y humedad.± 0,5 ℃ ／ ±5,0% HRLa temperatura baja el tiempo.+20 ～ -40 ℃75 añosTiempo de aumento de temperatura-40 ～ + 100 ℃50 añosSe analizó el volumen interno del útero.800ＬMétodo de pulgadas de la sala de prueba (ancho, profundidad y altura)1000 mm × 800 mm × 1000 mmMétodo de pulgadas del producto (ancho, profundidad y altura)1400 mm × 1190 mm × 1795 mmhacer el materialEquipo externoPanel de control de la sala de pruebassala de maquinasPlaca de acero fría, placa de acero fría beige(Tabla de colores 2.5Y8/2)AdentroPlaca de acero inoxidable (SUS304,2B pulida)Material de calor rotoPrueba de úteroresina sintética dura―PuertaAlgodón espuma de resina sintética dura, algodón de vidrioProyectoTipoSerieＭＨＰＭ－ＷEliminación de enfriamiento, dispositivo húmedo Método de enfriamiento Modo de contracción de sección mecánica. Medio de enfriamientoＲ４０４ＡUno mismo puede encoger la máquina.Producción (número de empleados)1,5kW（１）Refrigeración y deshumidificadorTipo de disipador de calor mixto multicanalel condensadorDisipador de radiador mixto multicanal (refrigeración por aire）calorificadorFormaCalentador de aleación de níquel-cromo resistente al calorVolumen3,5kW humidificador Formageneración de vaporVolumen1.8Kw×2SopladorFormaDisipador de radiador mixto multicanal (refrigeración por aire）Capacidad del motor40WUnidad de agua de alimentaciónEl cilindro de suministro de agua Método de suministro de aguaCalidad del aguaAgua pura ＊ Suministro de agua automático("Consulte el suministro automático de agua.")Volumen tipo de gravedad Disco hidratante tipo de gravedad ControladorRango de ajuste de temperatura-42,0 ～ + 102,0 ℃Rango de ajuste de humedad0 ~ 98% HR (temperatura de bulbo seco 10 ~ 85 ℃)Rango de tiempo establecido0 ～ 999 Tiempo de 59 min (tipo de configuración del programa) 0 ～ 20000 Tiempo de 59 min (el tipo de valor)Establecer energía de descomposiciónTemperatura 0,1 ℃, humedad 1% RH durante 1 minIndicar precisiónTemperatura ± 0,8 ℃ (tp.), humedad ± 1% RH (tp.), tiempo ± 100 PPMTipo de vacacionesValor o programaNúmero de etapa20 etapas / 1 programaEl número de procedimientosEl número máximo de programas de fuerza entrante (RAM) es 32 programasEl número máximo de programas ROM internos es de 13 programas.Número de ida y vuelta 98 veces máximo o ilimitadoNúmero de repeticiones de ida y vueltaMáximo 3 pesadosDesplazar el finalPt 100Ω (a 0 ℃), grado (JIS C 1604-1997)Acción de controlAl dividir la acción PIDFunción internaFunción de entrega anticipada, función de espera, función de mantenimiento del valor de configuración, función de protección contra cortes de energía,Función de selección de acción de potencia, función de mantenimiento, función de transporte de ida y vuelta,Función de entrega de tiempo, función de salida de señal de tiempo, función de prevención de sobrecalentamiento y sobreenfriamiento,Función de representación anormal, función de salida de alarma externa, función de representación de paradigma de configuración,Función de selección del tipo de transporte, el tiempo de cálculo representa la función, la función de la lámpara de la lámpara de ranuraProyectoTipoSerieＭＨＰＭ－ＷPanel de controlmaquina de equipoPanel de operación LCD (tipo panel de contacto),Representa lámpara (alimentación, transporte, anormal), terminal de fuente de alimentación de prueba, terminal de alarma externa,Terminal de salida de señal horaria, conector del cable de alimentación Dispositivo protector Ciclo frigoríficoDispositivo de protección contra sobrecargas, dispositivo de bloqueo alto.calorificadorDispositivo de protección contra sobrecalentamiento, fusible de temperaturahumidificador Dispositivo de prevención de quemaduras de aire, regulador de nivel de agua de disco humidificadorSopladorDispositivo de protección contra sobrecargaPanel de controlDisyuntor de fugas para fuente de alimentación, fusible (para calentador, humidificador),Fusible (para circuito de operación), dispositivo de protección contra aumento de temperatura (para prueba),Dispositivo de prevención de sobreenfriamiento por aumento de temperatura (material de prueba, en microcomputadora)Subproductos (conjuntos)Receptor de la casa (4), tablero de la casa (2), mecha de bola húmeda (15), manual de operación (1)Productos de equipamientoAdventiciaVidrio de borosilicato duro 800 mm × 800 mm2Orificio para cablesTamaño del orificio 50 mm１El comedero dentro de la lámpara.AC100V 15W Bola blanca caliente２Rueda ４Ajuste horizontal ４Características del electrovirusFuente CA trifásica 380V 50HzCorriente de carga máxima25ACapacidad del disyuntor de fugas para el suministro de energía.50ACorriente sensorial 30mAEspesor de distribución de energía14mm2Manguera aislante de cauchoGrosor del cable de tierra5,5 mm2TuberíaTubo de desagüePT1/2
Consejos de mantenimiento diario para cámaras de prueba de alta y baja temperatura y cámaras de prueba alternadas de alta y baja temperatura1. Cámaras de prueba de alta y baja temperatura. son generalmente relativamente altos y recomendamos colocarlos en un ambiente de temperatura relativamente benigna. Nuestro valor de temperatura de experiencia es de 8 ℃ ~ 23 ℃. Para los laboratorios que no cuenten con esta condición, se deberán equipar aires acondicionados o torres de enfriamiento adecuados.2. Es necesario adherirse a una gestión profesional por parte de personal dedicado. Las unidades con condiciones deben enviar periódicamente personal dedicado a la fábrica del proveedor para capacitación y aprendizaje, con el fin de obtener más experiencia y capacidad profesional en el mantenimiento y reparación de instrumentos Hongzhan.3. Limpie periódicamente el condensador cada 3 meses: para los compresores que utilizan refrigeración por aire, el ventilador del condensador debe inspeccionarse periódicamente y el condensador debe limpiarse y quitarse el polvo para garantizar una buena ventilación y rendimiento de transferencia de calor; Para los compresores que utilizan refrigeración por agua, además de asegurar la presión y temperatura del agua de entrada, también es necesario asegurar el caudal correspondiente. También es necesaria una limpieza y desincrustación periódica del interior del condensador para obtener su rendimiento continuo de transferencia de calor.4. Limpie periódicamente el evaporador: debido a los diferentes niveles de limpieza de las muestras de prueba, se acumularán muchas partículas pequeñas, como polvo, en el evaporador bajo la circulación de aire forzado y deben limpiarse con regularidad.5. Limpieza y equilibrio de las aspas de aire circulante y los ventiladores del condensador: de manera similar a la limpieza de los evaporadores, debido a los diferentes entornos de trabajo de la cámara de prueba, muchas partículas pequeñas, como polvo, pueden acumularse en las aspas de aire circulante y los ventiladores del condensador, y deben limpiarse. regularmente.6. Limpieza del conducto de agua y del humidificador: Si el conducto de agua no es liso y el humidificador se incrusta, es fácil que el humidificador se seque y se queme, lo que puede dañarlo. Por lo tanto, es necesario limpiar periódicamente el conducto de agua y el humidificador.7. Después de cada experimento, ajuste la temperatura cerca de la temperatura ambiente, trabaje durante unos 30 minutos, luego corte la energía y limpie la pared interior del taller.Si es necesario reubicar el equipo, es mejor hacerlo bajo la guía del personal técnico de Hongzhan Company para evitar daños innecesarios o daños al equipo.Cuando el producto no esté en uso durante un largo período de tiempo, se debe encender regularmente cada medio mes y el tiempo de encendido no debe ser inferior a 1 hora.10. Principio de mantenimiento:Debido a que las cámaras de prueba de alta y baja temperatura se componen principalmente de sistemas eléctricos, de refrigeración y mecánicos, una vez que hay un problema con el equipo, se debe realizar una inspección y un análisis exhaustivos de todo el sistema del equipo.En términos generales, el proceso de análisis y juicio puede comenzar con "externo" y luego con "interno", es decir, después de excluir los factores externos, el equipo se puede descomponer sistemáticamente en función del fenómeno de falla. Entonces, el sistema podrá analizarse y juzgarse exhaustivamente. Alternativamente, se puede utilizar el método de razonamiento inverso para encontrar la causa de la falla: primero, verifique si hay un problema con el sistema eléctrico de acuerdo con el diagrama de cableado eléctrico y, finalmente, verifique si hay un problema con el sistema de refrigeración. Antes de comprender la causa de la falla, no es aconsejable desmontar o reemplazar componentes a ciegas para evitar problemas innecesarios.
¡La primera estación de prueba de formación de hielo en un entorno natural en China, construida conjuntamente por la Universidad de Chongqing y la Oficina de Energía Eléctrica de Huaihua, se ha instalado en la montaña Xuefeng!El 16 de enero, se llevó a cabo en Huaihua el seminario de intercambio de tecnología de prueba de cubierta de hielo aislante "Estación de prueba de cubierta de hielo natural Xuefengshan", organizado conjuntamente por la Universidad de Chongqing y el Instituto de Diseño de Energía Eléctrica Hunan Huaihua. Expertos en líneas de transmisión y distribución y tecnología de aislamiento de reconocidas universidades de todo el país, así como expertos en electricidad de la compañía japonesa NGK, se reunieron para celebrar la finalización oficial de la única estación de prueba de capa de hielo natural del mundo y la primera de China en Huaihua. Hunan, y para discutir cuestiones de investigación de seguimiento.En la reunión, el profesor Jiang Xingliang, supervisor doctoral de la Universidad de Chongqing, expresó en primer lugar su agradecimiento a la Oficina de Energía Eléctrica de Huaihua y a varias unidades del sistema eléctrico por su firme apoyo y asistencia en el diseño básico y la construcción de la base experimental. Los expertos asistentes escucharon el informe del profesor asociado Zhang Zhijin sobre la construcción de la estación de prueba de la capa de hielo natural de Xuefengshan y la prueba de la capa de hielo de 2009, compartieron los resultados de la observación y la investigación del hielo en la base de pruebas a lo largo de 2009 y llevaron a cabo debates e investigaciones en profundidad. sobre los problemas existentes. Después de la reunión, los expertos también fueron a la "Estación de prueba de la capa de hielo natural de Xuefengshan" para realizar una investigación in situ, y los representantes expresaron su afirmación sobre la selección del sitio y la construcción de la estación de prueba.El profesor Jiang Xingliang explicó que desde el desastre del hielo de 2008, para evitar un gran número de desconexiones de líneas, derrumbes de torres y accidentes causados por congelaciones severas, y para mantener el funcionamiento seguro y estable de la red eléctrica, el Ministerio de Ciencia y Tecnología de China ha incluido la tecnología de protección y formación de hielo en la red como uno de los temas de investigación importantes del Plan Nacional Clave de Investigación y Desarrollo Básico (Plan 973). Con el apoyo de proyectos como "Cubierta de hielo, deshielo y mecanismos de fusión de líneas de transmisión" de State Grid Corporation de China, el equipo de investigación del profesor Jiang Xingliang llevó a cabo una investigación exhaustiva de las condiciones típicas de la capa de hielo en China, analizó y comparó la capa de hielo. fenómenos y micrometeorología en Liupanshui, Guizhou, montañas Qinling, Shaanxi, Jingmen, Sichuan y Lushan, Jiangxi. Sobre la base de la representatividad, duración y condiciones de transporte de la capa de hielo, se determinó establecer una "base de prueba de la capa de hielo natural" en Xuefengshan, Hunan. Se creía que las condiciones naturales de Pingshantang en Xuefengshan y la solidez técnica del Instituto de Diseño Huaihua cumplían los requisitos para la construcción de bases de prueba de la capa de hielo natural. Finalmente se determinó la selección del sitio y el socio de cooperación.En 2009, el profesor Jiang Xingliang, el profesor asociado Zhang Zhijin y el Dr. Hu Jianlin, entre otros miembros clave del grupo de investigación, dirigieron a más de diez estudiantes graduados del Departamento de Alto Voltaje y Tecnología de Aislamiento de la Universidad de Chongqing para superar diversas dificultades en trabajo y vida en duras condiciones naturales. Trabajaron junto con el Huaihua Bureau Design Institute para construir una base experimental natural mientras realizaban investigaciones experimentales. En el primer año del experimento, se estudiaron los procesos de formación de hielo, descongelación y deshielo de seis especificaciones típicas de conductores comúnmente utilizados en líneas de transmisión de alto voltaje, voltaje ultra alto y voltaje ultra alto. Se observaron y compararon los procesos de formación de hielo de varios tipos de aisladores. Se investigaron experimentalmente múltiples medidas técnicas para prevenir la formación de hielo en los conductores, como recubrimientos mecánicos e hidrofóbicos, así como recubrimientos para prevenir la formación de hielo en los aisladores y diferencias en las disposiciones de formación de hielo en los aisladores. Se analizaron el proceso de torsión y el mecanismo de formación de hielo en los conductores, y se analizaron los cambios de tensión y los cambios en la carga del viento helado después de la formación de hielo en los conductores. Además, se realizaron pruebas de formación de hielo en CA y CC en entornos naturales. Se acumuló una gran cantidad de datos experimentales clave para superar el problema mundial de la formación de hielo en las redes eléctricas, y se realizaron muchos estudios y exploraciones eficaces.Toshiyuki Nakajima, ingeniero jefe de la división de energía eléctrica de NGK Corporation en Japón, declaró en una entrevista con periodistas durante su inspección de la estación de pruebas de la capa de hielo natural de Xuefengshan que ha estado involucrado en investigaciones sobre la capa de hielo de la red eléctrica en los Estados Unidos durante 10 años. Aunque los expertos internacionales han realizado investigaciones a largo plazo sobre la capa de hielo de la red eléctrica en condiciones de simulación artificial de laboratorio, creen unánimemente que existe un error significativo entre la forma de la capa de hielo en el entorno de simulación artificial y la situación real en el entorno natural. La primera estación de prueba de la capa de hielo natural construida en Xuefengshan promoverá sin duda en gran medida el proceso de investigación de la capa de hielo y los mecanismos de derretimiento de las líneas de transmisión y la capacidad antihielo de las redes eléctricas en China e internacionalmente. Desea que sus homólogos chinos obtengan pronto la base de la capa de hielo en las líneas de transmisión en entornos naturales. Los datos llenan el vacío en la investigación internacional en este campo y superan el desafío de clase mundial del mecanismo de formación de hielo de la red eléctrica y la tecnología antihielo lo antes posible.Zhang Jiwu, presidente del Instituto de Diseño de la Oficina de Energía Eléctrica de Huaihua, afirmó que con el fuerte apoyo del secretario Liang Liqing del Comité del Partido de la Oficina de Energía Eléctrica de Huaihua, se construyó la estación de prueba de la capa de hielo natural de Xuefengshan en cooperación con la Universidad de Chongqing. Por un lado, puede contribuir a la investigación sobre la mejora de la resistencia al hielo de la red eléctrica y reflejar el sentido de responsabilidad social de la empresa; Por otro lado, también puede mejorar su propia fortaleza tecnológica y reputación corporativa a través de la cooperación y el intercambio, mejorar su competitividad externa y lograr una situación en la que todos ganen. Es un modelo de cooperación de "investigación universitaria industrial" entre empresas e instituciones de educación superior. (Shu Daisong y Zhang Deming)Fuente de información: Compañía de energía eléctrica de HunanLab Companion tiene una institución de investigación especializada en el desarrollo de equipos de pruebas ambientales, con laboratorios y métodos de investigación de pruebas ambientales maduros. Ha reunido a un grupo de excelentes talentos y reconocidos expertos en la industria, y un sólido equipo de I+D está liderando la dirección de desarrollo de la tecnología de pruebas ambientales nacionales. En la actualidad, la empresa tiene derechos de propiedad intelectual independientes en equipos de prueba ambiental, equipos de prueba de confiabilidad, cámaras de prueba de alta y baja temperatura, cámaras de prueba de humedad de alta y baja temperatura, cámaras de prueba de temperatura y humedad constantes, cámaras de prueba de cambio rápido de temperatura, frío y calor. cámaras de prueba de choque, tres cámaras de prueba integrales, cámaras de prueba de alta y baja temperatura y baja presión, cámaras de prueba de radiación solar, hornos industriales, cámaras de prueba de choque frío y caliente, cámaras de prueba de temperatura y humedad constantes, cámaras de prueba de detección de estrés ambiental, cámaras de prueba de temperatura y humedad constantes, cámaras de prueba de impacto de temperatura alta y baja, máquinas de prueba de humedad y temperatura constantes, cámaras de prueba de humedad y temperatura constante, cámaras de prueba de radiación solar, cámaras de prueba de humedad de temperatura alta y baja, cámaras de control de temperatura y humedad , Máquinas de prueba de envejecimiento acelerado por UV, máquinas de prueba de intemperismo acelerado por UV, cámaras de prueba sin cita previa, cámaras de prueba ambientales sin cita previa. Sala, laboratorio de alta y baja temperatura, cámara de prueba de control de temperatura y humedad, cámara de prueba de resistencia a la intemperie UV, probador de envejecimiento UV, equipo de prueba del entorno climático y productos personalizados, incluidos temperatura alta, baja y cámaras de prueba de baja presión, cámaras de prueba de ciclos rápidos de temperatura, cámaras de prueba de temperatura y humedad constantes, cámaras de prueba de humedad y temperatura constantes, hornos de precisión, cámaras de prueba de humedad y temperatura constantes programables, máquinas de prueba de humedad y temperatura constantes programables, cámaras de prueba de envejecimiento de lámparas de xenón, alta y Las cámaras de prueba de humedad alterna de baja temperatura, las cámaras de prueba de humedad y temperatura constante, las cámaras de prueba de humedad de temperatura alta y baja y las cámaras de prueba de lluvia de alta velocidad del viento están a la vanguardia de los estándares nacionales e internacionales. 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