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, Hochlasttank mit konstanter Temperatur und Luftfeuchtigkeit (800 l)ProjektTypSerieＭＨＰＭ－ＷFunktionTemperatur- und LuftfeuchtigkeitsmodusDer Weg des nassen BallsTemperaturbereich-40 ～ + 100 ℃Luftfeuchtigkeitsbereich20 ～ 98 % relative Luftfeuchtigkeit(Gemäß den Anaphase-3-Items)Änderungen der Temperatur und Luftfeuchtigkeit± 0,3 ℃ ／ ±2,5 % RHTemperatur- und Luftfeuchtigkeitsverteilung± 0,5 ℃ ／ ±5,0 % RHDie Temperatur verringert die Zeit+20 ～ -40 ℃75 Jahre altTemperaturanstiegszeit-40 ～ + 100 ℃50 MonateDas Innenvolumen der Gebärmutter wurde getestet800 ＬTestraum-Zoll-Methode (Breite, Tiefe und Höhe)1000 mm × 800 mm × 1000 mmProdukt-Zoll-Methode (Breite, Tiefe und Höhe)1400 mm × 1190 mm × 1795 mmMachen Sie das MaterialÄußeres OutfitBedienfeld für den PrüfraumMaschinenraumKaltstahlplatte, Kaltstahlplatte beige(Farbtabelle 2,5Y8/2)InnenEdelstahlplatte (SUS304,2B poliert)Defektes WärmematerialTesten Sie die GebärmutterHartes Kunstharz―TürHarte Kunstharzschaum-Baumwolle, GlasbaumwolleProjektTypSerieＭＨＰＭ－ＷKühlentnahme, Nassgerät Abkühlmethode Mechanischer Abschnittsschrumpfungsmodus KühlmediumＲ４０４ＡDie Maschine kann sich selbst schrumpfenOutput (Anzahl der Mitarbeiter)1,5 kW (１）)Kühlung und LuftentfeuchterMehrkanaliger gemischter KühlkörpertypDer KondensatorMehrkanaliger gemischter Kühlkörper (Luftkühlung）KaloriererBildenHeizgerät aus hitzebeständiger Nickel-Chrom-LegierungVolumen3,5 kW Luftbefeuchter BildenDampferzeugungVolumen1,8 kW×2GebläseBildenMehrkanaliger gemischter Kühlkörper (Luftkühlung）Motorleistung40WSpeisewassereinheitDer Wasserversorgungszylinder. WasserversorgungsmethodeWasserqualitätReines Wasser ＊ Automatische Wasserversorgung（„Bitte beachten Sie die automatische Wasserversorgung.“）Volumen Schwerkrafttyp Feuchtigkeitsspendende Scheibe Schwerkrafttyp ReglerTemperatur-Einstellbereich-42,0 ～ + 102,0 ℃Einstellbereich der Luftfeuchtigkeit0 ～ 98 % RH (Trockenkugeltemperatur 10 ～ 85 ℃)Zeiteinstellbereich0 ～ 999Zeit von 59 Minuten (Programmeinstellungstyp) 0 ～ 20000 Zeit von 59 Minuten (Der Werttyp)Zersetzungsenergie einstellenTemperatur 0,1℃, Luftfeuchtigkeit 1 % RH für 1 MinuteGeben Sie die Genauigkeit anTemperatur ± 0,8℃ (TPM), Luftfeuchtigkeit ± 1 % RH (TPM), Zeit ± 100 PPMUrlaubsartWert oder ProgrammEtappennummer20 Stufen / 1 ProgrammDie Anzahl der VerfahrenDie maximale Anzahl eingehender Kraftprogramme (RAM) beträgt 32 ProgrammeDie maximale Anzahl interner ROM-Programme beträgt 13 ProgrammeHin- und Rückfahrtnummer Maximal 98 Mal oder unbegrenztAnzahl der Roundtrip-WiederholungenMaximal 3 schwerVerschieben Sie das EndePt 100Ω (bei 0 ℃), Güteklasse (JIS C 1604-1997)KontrollaktionBeim Aufteilen der PID-AktionInterne FunktionFrühzeitige Lieferfunktion, Standby-Funktion, Einstellwert-Wartungsfunktion, Stromausfall-Schutzfunktion,Power-Action-Auswahlfunktion, Wartungsfunktion, Transport-Round-Trip-Funktion,Zeitlieferfunktion, Zeitsignalausgabefunktion, Überhitzungs- und Überkühlungsschutzfunktion,Abnormale Darstellungsfunktion, externe Alarmausgangsfunktion, Einstellungsparadigmendarstellungsfunktion,Funktion zur Auswahl des Transporttyps, die Berechnungszeit stellt die Funktion dar, die SchlitzlampenlampenfunktionProjektTypSerieＭＨＰＭ－ＷBedienfeldAusrüstungsmaschineLCD-Bedienfeld (Typ Kontaktpanel),Steht für Lampe (Strom, Transport, abnormal), Teststromversorgungsanschluss, externen Alarmanschluss,Zeitsignal-Ausgangsanschluss, Netzkabelanschluss Schutzvorrichtung KühlkreislaufÜberlastschutzgerät, HochblockiergerätKaloriererTemperaturüberschreitungsschutzvorrichtung, TemperatursicherungLuftbefeuchter Vorrichtung zur Vermeidung von Luftverbrennungen, Wasserstandsregler mit BefeuchtungsscheibeGebläseÜberlastschutzgerätBedienfeldLeckageschutzschalter für Stromversorgung, Sicherung (für Heizung, Luftbefeuchter),Sicherung (für die Betriebsschleife), Temperaturanstiegsschutzgerät (für Tests),Gerät zur Verhinderung von Überkühlung bei Temperaturanstieg (Testmaterial, im Mikrocomputer)Nebenprodukte (Sets)Hausempfänger (4), Hausbrett (2), Nassballdocht (15), Bedienungsanleitung (1)AusrüstungsprodukteAdventitiaHartes Borosilikatglas 800 mm× 800 mm2KabellochBohrungsgröße 50 mm１Die Wanne im Inneren der LampeAC100V 15W Weiße heiße Kugel２Rad ４Horizontale Anpassung ４Eigenschaften des ElektrovirusQuelle Wechselstrom dreiphasig 380V 50HzMaximaler Laststrom25AKapazität des Fehlerstromschutzschalters für die Stromversorgung50ASensorischer Strom 30mADicke der Stromverteilung14mm2Gummi-IsolierschlauchGrobheit des Erdungskabels5,5 mm2SchläucheAbflussrohrPT1/2 Produktqualität550kg
Tägliche Wartungstipps für Hoch- und Niedertemperatur-Prüfkammern und abwechselnde Hoch- und Niedertemperatur-Prüfkammern1. Prüfkammern für hohe und niedrige Temperaturen sind im Allgemeinen relativ hoch und wir empfehlen, sie in einer relativ angenehmen Temperaturumgebung aufzustellen. Unser Erfahrungstemperaturwert liegt bei 8℃~23℃. Für Labore, die diese Voraussetzung nicht erfüllen, müssen entsprechende Klimaanlagen oder Kühltürme ausgestattet sein.2. Es ist notwendig, eine professionelle Führung durch engagiertes Personal einzuhalten. Einheiten mit Bedingungen sollten regelmäßig engagiertes Personal zur Schulung und Schulung in die Fabrik des Lieferanten schicken, um mehr Berufserfahrung und Fähigkeiten bei der Wartung und Reparatur von Hongzhan-Instrumenten zu sammeln.3. Reinigen Sie den Kondensator regelmäßig alle 3 Monate: Bei Kompressoren mit luftgekühlter Kühlung sollte der Kondensatorlüfter regelmäßig überprüft und der Kondensator gereinigt und entstaubt werden, um eine gute Belüftung und Wärmeübertragungsleistung zu gewährleisten; Bei Kompressoren, die eine wassergekühlte Kühlung verwenden, muss neben der Sicherstellung des Wassereinlassdrucks und der Wassertemperatur auch die entsprechende Durchflussrate sichergestellt werden. Um eine kontinuierliche Wärmeübertragungsleistung zu gewährleisten, ist außerdem eine regelmäßige Reinigung und Entkalkung des Kondensatorinneren erforderlich.4. Reinigen Sie den Verdampfer regelmäßig: Aufgrund der unterschiedlichen Reinheitsgrade der Prüflinge sammeln sich bei erzwungener Luftzirkulation viele kleine Partikel wie Staub am Verdampfer an und sollten regelmäßig gereinigt werden.5. Reinigung und Auswuchten von Umluftflügeln und Kondensatorventilatoren: Ähnlich wie bei der Reinigung von Verdampfern können sich aufgrund der unterschiedlichen Arbeitsumgebungen der Prüfkammer viele kleine Partikel wie Staub auf den Umluftflügeln und Kondensatorventilatoren ansammeln und sollten gereinigt werden regelmäßig.6. Reinigung des Wasserwegs und des Luftbefeuchters: Wenn der Wasserweg nicht glatt ist und der Luftbefeuchter verkalkt, kann der Luftbefeuchter leicht austrocknen und verbrennen, was zu Schäden am Luftbefeuchter führen kann. Daher ist es notwendig, den Wasserweg und den Luftbefeuchter regelmäßig zu reinigen.7. Stellen Sie nach jedem Experiment die Temperatur nahe der Umgebungstemperatur ein, arbeiten Sie etwa 30 Minuten lang, unterbrechen Sie dann den Strom und reinigen Sie die Innenwand der Werkstatt.Wenn die Ausrüstung verlagert werden muss, sollte dies am besten unter Anleitung des technischen Personals der Hongzhan Company erfolgen, um unnötige Schäden oder Schäden an der Ausrüstung zu vermeiden.Wenn das Produkt über einen längeren Zeitraum nicht verwendet wird, sollte es regelmäßig alle halben Monate eingeschaltet werden und die Einschaltzeit sollte nicht weniger als 1 Stunde betragen.10. Wartungsprinzip:Da Hoch- und Niedertemperaturprüfkammern hauptsächlich aus elektrischen, Kühl- und mechanischen Systemen bestehen, sollte bei einem Problem mit der Ausrüstung eine umfassende Inspektion und Analyse des gesamten Ausrüstungssystems durchgeführt werden.Im Allgemeinen kann der Prozess der Analyse und Beurteilung mit „extern“ und dann „intern“ beginnen, d. h. nach Ausschluss externer Faktoren kann das Gerät basierend auf dem Fehlerphänomen systematisch zerlegt werden. Anschließend kann das System umfassend analysiert und beurteilt werden. Alternativ kann auch die umgekehrte Argumentationsmethode verwendet werden, um die Fehlerursache zu finden: Zuerst anhand des elektrischen Schaltplans prüfen, ob ein Problem mit der elektrischen Anlage vorliegt, und schließlich prüfen, ob ein Problem mit der Kühlanlage vorliegt. Bevor die Fehlerursache geklärt ist, ist es nicht ratsam, Komponenten blind zu zerlegen oder auszutauschen, um unnötige Probleme zu vermeiden.
Die erste Vereisungsteststation in natürlicher Umgebung in China, die gemeinsam von der Chongqing-Universität und dem Huaihua Electric Power Bureau gebaut wurde, hat sich am Berg Xuefeng niedergelassen!Am 16. Januar fand in Huaihua das gemeinsam von der Universität Chongqing und dem Hunan Huaihua Electric Power Design Institute organisierte Austauschseminar „Xuefengshan Natural Ice Cover Test Station“ zum Austausch von Isolator-Eisbedeckungstests statt. Experten für Übertragungs- und Verteilungsleitungen und Isolationstechnologie von renommierten Universitäten im ganzen Land sowie Elektroexperten des japanischen Unternehmens NGK kamen zusammen, um die offizielle Fertigstellung der weltweit einzigen und Chinas ersten Teststation für natürliche Eisbedeckung in Huaihua zu feiern. Hunan und zur Erörterung weiterer Forschungsangelegenheiten.Bei dem Treffen drückte Professor Jiang Die anwesenden Experten hörten sich den Bericht von außerordentlichem Professor Zhang Zhijin über den Bau der Xuefengshan Natural Ice Cover Test Station und den Ice Cover Test 2009 an, teilten die Eisbeobachtungs- und Forschungsergebnisse auf der Testbasis im Laufe des Jahres 2009 und führten ausführliche Diskussionen und Untersuchungen durch über die bestehenden Probleme. Nach dem Treffen begaben sich die Experten auch zur „Xuefengshan Natural Ice Cover Test Station“, um vor Ort Untersuchungen durchzuführen, und die Vertreter brachten ihre Zustimmung zur Standortwahl und zum Bau der Teststation zum Ausdruck.Professor Jiang Xingliang stellte vor, dass das Ministerium für Science and Technology of China hat die Netzvereisungs- und Schutztechnologie als eines der wichtigen Forschungsthemen des National Key Basic Research and Development Plan (973-Plan) aufgeführt. Mit Unterstützung von Projekten wie „Ice Cover, Deicing, and Melting Mechanisms of Transmission Lines“ der State Grid Corporation of China führte das Forschungsteam von Professor Jiang Xingliang eine umfassende Untersuchung typischer Eisbedeckungsbedingungen in China durch, analysierte und verglich die Eisbedeckung Phänomene und Mikrometeorologie in Liupanshui, Guizhou, den Qinling-Bergen, Shaanxi, Jingmen, Sichuan und Lushan, Jiangxi. Basierend auf der Repräsentativität, Dauer und Transportbedingungen der Eisbedeckung wurde beschlossen, in Xuefengshan, Hunan, eine „Testbasis für die natürliche Eisbedeckung“ einzurichten. Es wurde angenommen, dass die natürlichen Bedingungen von Pingshantang in Xuefengshan und die technische Stärke des Huaihua Design Institute die Anforderungen für den Bau von Testbasen für die natürliche Eisbedeckung erfüllten. Abschließend wurden die Standortauswahl und der Kooperationspartner festgelegt.Im Jahr 2009 führten Professor Jiang Xingliang, Associate Professor Zhang Zhijin und Dr Arbeit und Leben unter rauen natürlichen Bedingungen. Sie arbeiteten mit dem Huaihua Bureau Design Institute zusammen, um eine natürliche experimentelle Basis zu schaffen und gleichzeitig experimentelle Forschung durchzuführen. Im ersten Jahr des Experiments wurden die Vereisungs-, Auftau- und Enteisungsprozesse von sechs typischen Spezifikationen von Leitern untersucht, die üblicherweise in Hochspannungs-, Ultrahochspannungs- und Ultrahochspannungsübertragungsleitungen verwendet werden. Die Vereisungsprozesse verschiedener Isolatortypen wurden beobachtet und verglichen. Mehrere technische Maßnahmen zur Verhinderung der Vereisung von Leitern, wie mechanische und hydrophobe Beschichtungen sowie Beschichtungen zur Verhinderung der Vereisung von Isolatoren und Unterschiede in der Anordnung der Vereisung von Isolatoren, wurden experimentell untersucht. Der Verdrillungsprozess und der Mechanismus der Leitervereisung wurden analysiert, und die Spannungsänderungen und Eiswindlaständerungen nach der Leitervereisung wurden analysiert. Darüber hinaus wurden AC- und DC-Vereisungstests in natürlichen Umgebungen durchgeführt. Zur Überwindung des Weltklasseproblems der Vereisung des Stromnetzes wurde eine große Menge wichtiger experimenteller Daten gesammelt und viele wirksame Studien und Untersuchungen durchgeführt.Toshiyuki Nakajima, Chefingenieur der Electric Power Division der NGK Corporation in Japan, erklärte in einem Interview mit Reportern während seiner Inspektion der Xuefengshan Natural Ice Cover Test Station, dass er in den Vereinigten Staaten an der Erforschung der Eisbedeckung des Stromnetzes beteiligt sei 10 Jahre. Obwohl internationale Experten langfristige Untersuchungen zur Eisbedeckung von Stromnetzen unter künstlichen Simulationsbedingungen im Labor durchgeführt haben, sind sie sich einig, dass ein erheblicher Fehler zwischen der Eisbedeckungsform in der künstlichen Simulationsumgebung und der tatsächlichen Situation in der natürlichen Umgebung besteht. Die erste in Xuefengshan errichtete Teststation für die natürliche Eisbedeckung wird zweifellos den Forschungsprozess der Eisbedeckung und der Schmelzmechanismen von Übertragungsleitungen sowie die Eisschutzfähigkeit von Stromnetzen in China und international erheblich vorantreiben. Er wünscht seinen chinesischen Amtskollegen, dass sie bald die Grundlage für die Eisbedeckung von Übertragungsleitungen in natürlichen Umgebungen schaffen. Daten schließen die Lücke in der internationalen Forschung auf diesem Gebiet und meistern so schnell wie möglich die Weltklasse-Herausforderung des Vereisungsmechanismus und der Vereisungsschutztechnologie für Stromnetze.Zhang Jiwu, Präsident des Design Institute des Huaihua Electric Power Bureau, erklärte, dass mit der starken Unterstützung von Sekretär Liang Liqing vom Parteikomitee des Huaihua Electric Power Bureau die Xuefengshan Natural Ice Cover Test Station in Zusammenarbeit mit der Universität Chongqing gebaut wurde. Einerseits kann es einen eigenen Beitrag zur Forschung zur Verbesserung der Eisbeständigkeit des Stromnetzes leisten und das gesellschaftliche Verantwortungsbewusstsein des Unternehmens widerspiegeln; Andererseits kann es durch Zusammenarbeit und Austausch auch seine eigene technologische Stärke und den Ruf des Unternehmens stärken, seine externe Wettbewerbsfähigkeit verbessern und eine Win-Win-Situation erreichen. Es handelt sich um ein Modell der „Industrie-Universitätsforschung“-Kooperation zwischen Unternehmen und Hochschuleinrichtungen. (Shu Daisong und Zhang Deming)Informationsquelle: Hunan Electric Power CompanyLab Companion verfügt über eine Forschungseinrichtung, die sich auf die Entwicklung von Umwelttestgeräten spezialisiert hat und über ausgereifte Forschungsmethoden und Labore für Umwelttests verfügt. Es hat eine Gruppe hervorragender Talente und bekannter Experten der Branche versammelt, und ein starkes Forschungs- und Entwicklungsteam leitet die Entwicklungsrichtung der heimischen Umweltprüftechnologie. Derzeit verfügt das Unternehmen über unabhängige geistige Eigentumsrechte an Umweltprüfgeräten, Zuverlässigkeitsprüfgeräten, Prüfkammern für hohe und niedrige Temperaturen, Prüfkammern für Luftfeuchtigkeit bei hohen und niedrigen Temperaturen, Prüfkammern für konstante Temperatur und Luftfeuchtigkeit, Prüfkammern für schnelle Temperaturänderungen, kalt und heiß Schockprüfkammern, drei umfassende Prüfkammern, Hoch- und Niedertemperatur- und Niederdruckprüfkammern, Prüfkammern für Sonneneinstrahlung, Industrieöfen, Kalt- und Heißschockprüfkammern, begehbare Prüfkammern für konstante Temperatur und Luftfeuchtigkeit, Prüfkammern für Umweltbelastungstests, begehbare Prüfkammern für konstante Temperatur und Luftfeuchtigkeit, Schlagprüfkammern für hohe und niedrige Temperaturen, Prüfmaschinen für konstante Temperatur und Luftfeuchtigkeit, Prüfkammern für konstante Temperatur und Luftfeuchtigkeit, Prüfkammern für Sonneneinstrahlung, Prüfkammern für hohe und niedrige Luftfeuchtigkeit, Temperatur- und Feuchtigkeitskontrollkammern , UV-beschleunigte Alterungsprüfmaschinen, UV-beschleunigte Bewitterungsprüfmaschinen, begehbare Prüfkammern, begehbare Umweltprüfkammern. Raum, begehbares Labor für hohe und niedrige Temperaturen, Prüfkammer für Temperatur- und Feuchtigkeitskontrolle, Prüfkammer für UV-Wetterbeständigkeit, UV-Alterungstester, Prüfgeräte für die Klimaumgebung und kundenspezifische Produkte, einschließlich hohe, niedrige Temperatur und Niederdruckprüfkammern, Schnelltemperaturwechselprüfkammern, begehbare Testkammern für konstante Temperatur und Luftfeuchtigkeit, begehbare Testkammern für hohe, niedrige Temperatur und Luftfeuchtigkeit, Präzisionsöfen, programmierbare Testkammern für konstante Temperatur und Luftfeuchtigkeit, programmierbare Testmaschinen für konstante Temperatur und Luftfeuchtigkeit, Alterungstestkammern für Xenonlampen, hohe und Prüfkammern für wechselnde Luftfeuchtigkeit bei niedrigen Temperaturen, Prüfkammern für konstante Temperatur und Luftfeuchtigkeit, begehbare Prüfkammern für Luftfeuchtigkeit bei hohen und niedrigen Temperaturen sowie Regenprüfkammern für hohe Windgeschwindigkeiten stehen an der Spitze nationaler und internationaler Standards. 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