CN112093076A - High-altitude environment test parameter control system under large-flow ventilation environment - Google Patents
High-altitude environment test parameter control system under large-flow ventilation environment Download PDFInfo
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- CN112093076A CN112093076A CN202010961014.5A CN202010961014A CN112093076A CN 112093076 A CN112093076 A CN 112093076A CN 202010961014 A CN202010961014 A CN 202010961014A CN 112093076 A CN112093076 A CN 112093076A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64F—GROUND OR AIRCRAFT-CARRIER-DECK INSTALLATIONS SPECIALLY ADAPTED FOR USE IN CONNECTION WITH AIRCRAFT; DESIGNING, MANUFACTURING, ASSEMBLING, CLEANING, MAINTAINING OR REPAIRING AIRCRAFT, NOT OTHERWISE PROVIDED FOR; HANDLING, TRANSPORTING, TESTING OR INSPECTING AIRCRAFT COMPONENTS, NOT OTHERWISE PROVIDED FOR
- B64F5/00—Designing, manufacturing, assembling, cleaning, maintaining or repairing aircraft, not otherwise provided for; Handling, transporting, testing or inspecting aircraft components, not otherwise provided for
- B64F5/60—Testing or inspecting aircraft components or systems
Abstract
The application provides a high-altitude environment test parameter control system under a large-flow ventilation environment, which comprises a box body, wherein the box body is divided into a test room and an air conditioning room through an air duct partition plate, and a fence air supply outlet and an air return inlet are respectively arranged on the air duct partition plate; the temperature-adjusting heat sink is arranged in the test room, the variable frequency motor, the centrifugal wind wheel, the electric heater, the refrigeration evaporator and the dehumidification evaporator are arranged in the air-conditioning room, and the output end of the variable frequency motor is connected with the centrifugal wind wheel; an air supply unit, a humidification unit, a vacuumizing unit, a refrigerating unit, a heat transfer oil heat exchange unit and a measurement control unit are arranged on the outer side of the box body. The beneficial effect of this application is: the air circulation in the air conditioning room gets into the laboratory, can satisfy the comprehensive test system of the required dynamic temperature of high altitude environment test simulation, height, humidity parameter control, realizes the accurate regulation and control to the laboratory environment through measuring the control unit, and the control system energy consumption is low, can accurately simulate aviation machine carries electronic equipment actual work condition.
Description
Technical Field
The disclosure relates to the technical field of comprehensive environment tests of aviation onboard products, in particular to a high-altitude environment test parameter control system in a large-flow ventilation environment.
Background
The basic principle of the reliability test of the aviation product is to simulate the influence of environmental factors on the product in the actual use process as truly as possible, thereby exposing the defects of the product. Many high-power electronic products in airborne equipment need to be ventilated and cooled by an environmental control system to ensure the reliability of the high-power electronic products in the using process, so that the reliability test of the high-power electronic products also simulates real working conditions.
In the real working process of the airborne equipment, the cooling ventilation gas is directly discharged into the high-altitude atmosphere, and in the artificial simulation test environment, the cooling ventilation gas also needs to be directly discharged into the artificial simulation high-altitude environment. At present, reliability test equipment for aviation products in the market can only simulate a closed and stable high-altitude environment test device, lacks the control capability of high-altitude environment parameters under the condition of dynamic ventilation and cooling and cannot simulate a real environment, so that a method for accumulating examination item by a single environment test is mostly adopted in an aviation onboard ventilation and cooling test. However, the accumulated error of the comprehensive environmental effect and the single environmental effect acting on the test piece is very large, so that the test result of the test piece is distorted, and even the complete machine fails, and therefore, a set of high-altitude environmental test parameter control system in a large-flow ventilation environment is urgently needed to be developed.
Disclosure of Invention
The application aims to solve the problems and provides a high-altitude environment test parameter control system in a large-flow ventilation environment.
According to the first aspect, the application provides a high-altitude environment test parameter control system in a large-flow ventilation environment, which comprises a box body, wherein an air channel partition plate is arranged in the box body, the box body is divided into a test room and an air conditioning room through the air channel partition plate, a fence air supply opening is formed in the air channel partition plate corresponding to the top end of the box body, and a return air opening is formed in the air channel partition plate corresponding to the bottom end of the box body; the temperature-adjusting heat sink is arranged in the test chamber and covers the outer part of the test piece, the variable frequency motor, the centrifugal wind wheel, the electric heater, the refrigeration evaporator and the dehumidification evaporator are arranged in the air conditioning chamber, the output end of the variable frequency motor is connected with the centrifugal wind wheel, and the variable frequency motor is sealed at the top end of the outer side of the box body through the magnetic fluid; an air supply unit, a humidification unit, a vacuumizing unit, a refrigerating unit, a heat conduction oil heat exchange unit and a measurement control unit are arranged on the outer side of the box body; the air supply unit is used for supplying air to a test piece in the test room, the humidification unit is used for humidifying the air conditioning room, the vacuumizing unit is used for vacuumizing the air conditioning room, the refrigerating unit is used for providing a refrigerant for the refrigeration evaporator, the dehumidification evaporator and the heat conduction oil heat exchange unit, and the heat conduction oil heat exchange unit is used for providing heat conduction oil for the temperature-adjusting heat sink.
According to the technical scheme provided by the embodiment of the application, the temperature-adjusting heat sink is arranged as a stainless steel jacket device, a honeycomb type flow channel is arranged in the temperature-adjusting heat sink, and the heat-conducting oil is input into the honeycomb type flow channel by the heat-conducting oil heat exchange unit.
According to the technical scheme provided by the embodiment of the application, the air supply unit comprises a filtering subunit, a pressure reducing subunit, a flow control subunit, a refrigerating subunit and a heating subunit; air of an air source enters the pressure reduction subunit for pressure reduction after being dried and purified by the filtering subunit, is subjected to flow regulation by the flow control subunit, is subjected to temperature regulation by matching of the refrigeration subunit and the heating subunit, and is conveyed into a test piece in a test room through a pipeline after temperature regulation.
According to the technical scheme provided by the embodiment of the application, the nozzle is arranged in the air conditioning chamber by the humidifying unit, the ultra-cold water ultrasonic humidifier is adopted to form a negative pressure area at the nozzle, deionized water is attracted to the nozzle, and water molecule groups are formed to be mixed with air in the air conditioning chamber.
According to the technical scheme that this application embodiment provided, the output of evacuation unit is connected to the air condition room, the evacuation unit includes oil-free vacuum pump group and connects the vacuum pipe on vacuum pump group, and the tip of vacuum pipe extends to the air condition indoor, is equipped with vacuum valve on the vacuum pipe, carries out the speed of evacuation in to the air condition room through the aperture control of adjusting vacuum valve.
According to the technical scheme provided by the embodiment of the application, the refrigerating unit adopts a two-stage cascade type evaporation refrigerating cycle system.
According to the technical scheme provided by the embodiment of the application, the electric heater is a nichrome heating wire type heater.
According to the technical scheme that this application embodiment provided, the box includes the pressure-bearing layer, sets up at the apparent adiabatic heat preservation of pressure-bearing layer and sets up at the apparent shell of adiabatic heat preservation.
The invention has the following beneficial effects:
1. the air supply unit sends cold air into the air conditioning chamber and then quickly passes through the vacuumizing unit to reduce the disturbance of the temperature, the humidity and the pressure in the air conditioning chamber, so that the air conditioning chamber can quickly reach a stable state;
2. when a low-pressure low-temperature test is carried out, the refrigerating unit can simultaneously provide a coolant for the refrigeration evaporator, the dehumidification evaporator and the heat conduction oil heat exchange unit, and the low-temperature heat conduction oil in the temperature-adjusting heat sink is used for carrying out radiation refrigeration on a test room to make up for the defect that the refrigeration evaporator is insufficient in heat exchange capacity in a low-pressure environment;
3. air in the air conditioning chamber circularly enters the test chamber, a comprehensive test environment controlled by dynamic temperature, height and humidity parameters required by high-altitude environment test simulation can be met, accurate regulation and control of the environment in the test chamber are realized through the measurement control unit, the energy consumption of a control system is low, and the actual working condition of the airborne electronic equipment can be accurately simulated.
Drawings
FIG. 1 is a schematic block diagram of a first embodiment of the present application;
the text labels in the figures are represented as: 1. a box body; 2. temperature-adjusting heat sink; 3. an air duct partition plate; 4. a variable frequency motor; 5. a magnetic fluid; 6. a centrifugal wind wheel; 7. an electric heater; 8. a refrigeration evaporator; 9. a dehumidification evaporator; 10. an air supply unit; 11. a humidifying unit; 12. a vacuum pumping unit; 13. a refrigeration unit; 14. a heat transfer oil heat exchange unit; 15. a measurement control unit; 16. and (5) testing the part.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the following detailed description of the present invention is provided in conjunction with the accompanying drawings, and the description of the present section is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention in any way.
Fig. 1 shows a schematic diagram of a first embodiment of the present application, which includes a box body 1, an air duct partition plate 3 is arranged in the box body 1, the box body 1 is separated into a laboratory and an air conditioning room by the air duct partition plate 3, a fence air supply outlet is arranged at the top end of the air duct partition plate 3 corresponding to the box body 1, and a return air inlet is arranged at the bottom end of the air duct partition plate 3 corresponding to the box body 1. In this embodiment, preferably, the box body 1 includes a pressure-bearing layer, a heat insulation layer disposed on an outer surface of the pressure-bearing layer, and an outer shell disposed on an outer surface of the heat insulation layer. In this embodiment, the box body 1 is further provided with a box door, an observation window, a vacuum flange, a measurement and control flange, a water outlet and other interfaces. In this embodiment, the air in the air-conditioning room enters the laboratory through the fence air supply outlet, and circulates back to the air-conditioning room through the air return inlet after the circulation in the laboratory is finished.
The testing room is internally provided with a temperature-adjusting heat sink 2 covering the outside of the test piece 16, the air conditioning room is internally provided with a variable frequency motor 4, a centrifugal wind wheel 6, an electric heater 7, a refrigeration evaporator 8 and a dehumidification evaporator 9, the output end of the variable frequency motor 4 is connected with the centrifugal wind wheel 6, and the variable frequency motor 4 is sealed at the top end of the outer side of the box body 1 through a magnetic fluid 5. An air supply unit 10, a humidification unit 11, a vacuum pumping unit 12, a refrigerating unit 13, a heat conduction oil heat exchange unit 14 and a measurement control unit 15 are arranged on the outer side of the box body 1; the air supply unit 10 is used for supplying air to a test piece 16 in a test room, the humidification unit 11 is used for humidifying an air conditioning room, the vacuumizing unit 12 is used for vacuumizing the air conditioning room, the refrigerating unit 13 is used for providing a refrigerant for the refrigeration evaporator 8, the dehumidification evaporator 9 and the heat conduction oil heat exchange unit 14, and the heat conduction oil heat exchange unit 14 is used for providing heat conduction oil with a certain flow and a certain temperature for the temperature-adjusting heat sink 2.
In this embodiment, preferably, the temperature-adjusting heat sink 2 is a stainless steel jacket device, a honeycomb-shaped flow channel is arranged in the temperature-adjusting heat sink, and the heat-conducting oil is input into the honeycomb-shaped flow channel by the heat-conducting oil heat exchanging unit 14. The temperature can be adjusted within the range of-70 ℃ to +250 ℃ according to the test requirements. In this embodiment, the test piece 16 is placed inside the temperature-controlled heat sink 2.
In this embodiment, the centrifugal wind wheel 6 is driven by the variable frequency motor 4 sealed by the magnetic fluid 5 outside the box body 1, and air is stirred to enable the air in the test room to enter the air conditioning room through the air return opening. In this embodiment, the humidity in the air-conditioning room is reduced by the dehumidification evaporator 9, the temperature in the air-conditioning room is reduced by the refrigeration evaporator 8, the temperature in the air-conditioning room is increased by the electric heater 7, and the humidity in the air-conditioning room can be increased by sending water vapor into the air-conditioning room by the humidification unit 11. In this embodiment, air with a specific temperature and humidity is sucked by the centrifugal wind wheel 6, and is sent into the test room through the grid air supply outlet at the upper part of the air duct partition plate 3, so as to adjust the temperature and humidity of the space where the test piece 16 is located, and achieve the temperature and humidity environment required by the test.
In this embodiment, the temperature-adjusting heat sink 2 is mainly used for radiation refrigeration in a low-pressure environment, and can play a role in stabilizing a temperature field when a large amount of cooling ventilation gas is introduced into the test space. The heat conduction oil heat exchange unit 14 provides heat conduction oil for the temperature-adjusting heat sink 2, and the heat conduction oil realizes closed circulation in the temperature-adjusting heat sink 2 through an oil circulation system.
In this embodiment, the measurement control unit 15 adopts a two-stage control structure: local control and remote control. The local control and the remote control are interlocked, the functions are completely the same, the control of starting and stopping control of all controllable devices of the system, temperature and humidity in the test box, pressure control and an air supply system are realized, the PLC is used as a core control framework, the monitoring of the running state of the devices and the acquisition and control of test data are realized, and the undisturbed switching of the local control and the remote control is realized. In this embodiment, the measurement control unit 15 performs comprehensive and real-time control on the entire system, and realizes monitoring of the running state of the local device and acquisition and logic control of test data. The controlled equipment mainly comprises execution equipment, a sensor, a control unit, an operation cabinet and a touch screen in the system. The measurement control unit 15 is responsible for controlling different climate parameters such as temperature and humidity control and pressure control of the box body 1, illumination of the box body 1, an electric valve and the like. The control panel is provided with a touch screen, an audible and visual alarm, a button switch and the like, so that local start-stop operation, emergency stop operation, control parameter display and setting, alarm and the like are realized.
In this embodiment, a CFD fluid calculation simulation method is adopted to perform simulation optimization on the air circulation duct in the test space, and an optimal channel is established, so that the cooling ventilation gas can be evacuated by the evacuation unit 12 as soon as possible after entering the test space, the disturbance of the cooling ventilation gas on the temperature, humidity and pressure in the test space is reduced, and a stable state can be quickly achieved.
In a preferred embodiment, the air supply unit 10 includes a filtering subunit, a pressure reducing subunit, a flow control subunit, a refrigerating subunit, and a heating subunit; air of an air source enters the pressure reduction subunit for pressure reduction after being dried and purified by the filtering subunit, is subjected to flow regulation by the flow control subunit, is subjected to temperature regulation by matching of the refrigeration subunit and the heating subunit, and is conveyed into a test piece 16 in a test room through a pipeline after temperature regulation. In the embodiment, the air with specific flow and temperature required in the airborne ventilation test can be accurately simulated through the air supply unit 10, the air supply unit 10 in the embodiment adopts a multi-stage branch control principle, and the flow can be adjusted between 0kg/h and 250 kg/h.
In this embodiment, the air supply unit 10 outside the box 1 supplies fresh air into the test piece 16 through the box 1 via a pipeline. The main function of the unit is to provide dry gas with temperature, and the full-automatic temperature control is realized by adopting PLC control. The air supply unit 10 is provided with a plurality of flow control branches, each flow control branch can accurately regulate the air flow within a certain range, and the flow accuracy is not more than 1.5% within the range of 0-100 kg/h.
In a preferred embodiment, the humidifying unit 11 is provided with a nozzle in the air conditioning chamber, and forms a negative pressure region at the nozzle by using an ultra-cold water ultrasonic humidifier, and draws deionized water to the nozzle to form water molecule groups to be mixed with air in the air conditioning chamber. In this embodiment, the humidifying unit 11 adopts a spray type humidifying principle, forms a negative pressure region near the nozzle by using high-speed flowing gas, attracts deionized water to the nozzle, and atomizes the water into water molecule groups under the driving of high-speed airflow to be mixed with the gas in the environment. The water molecular groups are rapidly gasified, and the absolute moisture content in the air is rapidly increased. The mode is the same as evaporative humidification, is isenthalpic humidification, has the characteristics of high speed, high control precision and the like, and has the characteristics of high safety, no extra increase of heat in a test space and the like.
In this embodiment, the humidity in the test space is increased by humidifying with an ultra-cold water ultrasonic humidifier. The ultra-cold water ultrasonic humidifier adopts an ultrasonic high-frequency oscillation principle to atomize water into 1-5 mu m ultra-micro particles, ensures that the ambient temperature is still in a liquid state at the lowest temperature of-40 ℃ by an ultra-cold technology, and is matched with a nozzle device to diffuse water mist to a low-pressure low-temperature (or high-temperature) environment so as to achieve the purpose of uniform humidification. The ultra-cold water ultrasonic humidifier adopts unique humidity control, automatically adjusts the humidification quantity along with the humidity change, and automatically stops humidifying when the relative humidity is higher than a set upper limit H, so that the environment is always in a constant humidity state. The ultra-cold water ultrasonic humidifier is characterized in that a filter, a pump unit, a water tank, an ultrasonic device, an ultra-cold water device and a control box of the humidifier are installed outside a box body 1, and a spraying system (a nozzle, a pipeline, a capacitive humidity sensor) and the like are installed in an air conditioning chamber of the box body 1 for humidification. The humidifying mode is that purified water is pressurized by a humidifier host machine, is subjected to superfine filtration, is atomized by a special high-pressure nozzle through a super-cold water and ultrasonic device and is sprayed at high speed to form water mist particles of 1-5 mu m, and the water mist particles and flowing air are subjected to heat-humidity and cold-humidity exchange to realize humidity control under different temperature and pressure states in the box body 1.
In a preferred embodiment, the output end of the vacuum pumping unit 12 is connected to an air conditioning chamber, the vacuum pumping unit 12 comprises an oil-free vacuum pump set and a vacuum pipeline connected to the vacuum pump set, the end of the vacuum pipeline extends into the air conditioning chamber, a vacuum valve is arranged on the vacuum pipeline, and the rate of vacuum pumping in the air conditioning chamber is controlled by adjusting the opening degree of the vacuum valve.
In this embodiment, the pressure inside the box 1 is simulated by pumping or inflating air into the sealed test environment. And configuring a vacuum pump set and matched process equipment thereof according to the height or pressure requirements of different tests. The pressure reduction (height increase) is mainly carried out by controlling the air pumping speed, and the pressure increase (height decrease) is mainly carried out by controlling the re-pressing speed. The specific implementation process is as follows: the cabin body is provided with a vacuum pressure sensor, and an adjustable vacuum valve is arranged between the vacuum pump set and the cabin section. The pressure sensor is responsible for measuring the current vacuum degree in the container and feeding back to the control system, and the pressure control system controls and adjusts the aperture of the vacuum valve according to the feedback result, thereby realizes the adjustment and the maintenance of the appointed pressure value or the appointed rising rate through the balance of air exhaust and air intake. The descending speed adjustment in the descending process is mainly realized by the process of realizing controllable re-pressure of the cabin body through a controllable vacuum valve.
In a preferred embodiment, the refrigeration unit 13 employs a two-stage cascade type evaporative refrigeration cycle. In this embodiment, the refrigerant can change the flow through the regulation of solenoid valve to accurate control refrigeration volume.
In a preferred embodiment, the electric heater 7 is provided as a nichrome wire heater.
The principles and embodiments of the present application are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts of the present application. The foregoing is only a preferred embodiment of the present application, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present application, and the technical features described above may be combined in a suitable manner; such modifications, variations, combinations, or adaptations of the invention using its spirit and scope, as defined by the claims, may be directed to other uses and embodiments, or may be learned by practice of the invention.
Claims (8)
1. The high-altitude environment test parameter control system under the large-flow ventilation environment is characterized by comprising a box body (1), wherein an air channel partition plate (3) is arranged in the box body (1), the box body (1) is divided into a test room and an air conditioning room through the air channel partition plate (3), a fence air supply outlet is arranged at the top end of the air channel partition plate (3) corresponding to the box body (1), and a return air inlet is arranged at the bottom end of the air channel partition plate (3) corresponding to the box body (1); the temperature-adjusting heat sink (2) covered outside the test piece (16) is arranged in the test room, the variable frequency motor (4), the centrifugal wind wheel (6), the electric heater (7), the refrigeration evaporator (8) and the dehumidification evaporator (9) are arranged in the air-conditioning room, the output end of the variable frequency motor (4) is connected with the centrifugal wind wheel (6), and the variable frequency motor (4) is sealed at the top end of the outer side of the box body (1) through the magnetic fluid (5);
an air supply unit (10), a humidification unit (11), a vacuum pumping unit (12), a refrigerating unit (13), a heat transfer oil heat exchange unit (14) and a measurement control unit (15) are arranged on the outer side of the box body (1);
the air supply unit (10) is used for supplying air to a test piece (16) in a test room, the humidification unit (11) is used for humidifying an air conditioning room, the vacuumizing unit (12) is used for vacuumizing the air conditioning room, the refrigerating unit (13) is used for providing a refrigerant for the refrigerating evaporator (8), the dehumidifying evaporator (9) and the heat conduction oil heat exchange unit (14), and the heat conduction oil heat exchange unit (14) is used for providing heat conduction oil for the temperature adjusting heat sink (2).
2. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, wherein the temperature-adjusting heat sink (2) is arranged as a stainless steel jacket device, a honeycomb-type flow channel is arranged in the temperature-adjusting heat sink, and the heat-conducting oil heat exchange unit (14) inputs heat-conducting oil into the honeycomb-type flow channel.
3. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, wherein the air supply unit (10) comprises a filtering subunit, a pressure reducing subunit, a flow control subunit, a refrigerating subunit and a heating subunit; air of an air source enters the pressure reduction subunit for pressure reduction after being dried and purified by the filtering subunit, is subjected to flow regulation by the flow control subunit, is subjected to temperature regulation by matching of the refrigeration subunit and the heating subunit, and is conveyed into a test piece (16) in a test room through a pipeline after temperature regulation.
4. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, wherein the humidifying unit (11) is provided with a nozzle in the air conditioning chamber, and adopts an ultra-cold water ultrasonic humidifier to form a negative pressure region at the nozzle and attract deionized water to the nozzle to form water molecule clusters to be mixed with air in the air conditioning chamber.
5. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, wherein an output end of the vacuumizing unit (12) is connected to the air conditioning chamber, the vacuumizing unit (12) comprises an oil-free vacuum pump set and a vacuum pipeline connected to the vacuum pump set, an end of the vacuum pipeline extends into the air conditioning chamber, a vacuum valve is arranged on the vacuum pipeline, and the vacuumizing rate in the air conditioning chamber is controlled by adjusting the opening degree of the vacuum valve.
6. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, characterized in that the refrigerating unit (13) adopts a two-stage cascade type evaporation refrigerating cycle system.
7. The high-altitude environment test parameter control system in the high-flow ventilation environment according to claim 1, wherein the electric heater (7) is a nichrome heating wire heater.
8. The high-altitude environment test parameter control system in the large-flow ventilation environment according to claim 1, wherein the box body (1) comprises a pressure bearing layer, a heat insulation layer arranged on the outer surface of the pressure bearing layer and a shell arranged on the outer surface of the heat insulation layer.
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| CN202010961014.5A CN112093076A (en) | 2020-09-14 | 2020-09-14 | High-altitude environment test parameter control system under large-flow ventilation environment |
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| CN112729147A (en) * | 2020-12-28 | 2021-04-30 | 南京航空航天大学 | Blade strain measurement test system and method under complex environment |
| CN112798311A (en) * | 2020-12-31 | 2021-05-14 | 广东申菱环境系统股份有限公司 | Heat pump testing device |
| CN112881823A (en) * | 2021-01-08 | 2021-06-01 | 天地（常州）自动化股份有限公司 | Underground working condition environment simulation test system and test method |
| CN113009114A (en) * | 2021-03-10 | 2021-06-22 | 中国水利水电科学研究院 | Test device for generating, transmitting and monitoring temperature-controlled water vapor in soil body gradual humidification test |
| CN113734464A (en) * | 2021-09-08 | 2021-12-03 | 北京卫星环境工程研究所 | Vacuum air pumping system and method for high-altitude ignition test |
| CN114253324A (en) * | 2021-12-20 | 2022-03-29 | 中国人民解放军63921部队 | System and method for simulating high-temperature and low-temperature air environment of multi-temperature zone of environmental chamber |
| CN114405560A (en) * | 2022-02-18 | 2022-04-29 | 江苏拓米洛环境试验设备有限公司 | Temperature and humidity environment test box |
| CN114646586A (en) * | 2022-03-15 | 2022-06-21 | 中国电子科技集团公司第十研究所 | Airborne antenna temperature-humidity-altitude environment test device |
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| CN114646586A (en) * | 2022-03-15 | 2022-06-21 | 中国电子科技集团公司第十研究所 | Airborne antenna temperature-humidity-altitude environment test device |
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