High and cold high-altitude environment simulation device for testing electronic and electrical equipment

Abstract

The utility model discloses a high-cold high-altitude environment simulation device for testing electronic and electrical equipment, which belongs to the technical field of environment applicability testing of the electronic and electrical equipment and comprises an external air connecting header pipe, a liquid nitrogen tank and an environment simulation testing room, and a six-degree-of-freedom vibration simulation platform and a fan are arranged in the environment simulation testing room. A rainwater generating device and an ice and snow generating device are arranged on the top frame, and a side wall opening is connected with a pressure adjusting device; an inlet of the external air connecting header pipe is communicated with an external environment, an outlet of the external air connecting header pipe is connected with a first input port of the mixer, an outlet of the liquid nitrogen tank is connected with a second input port of the mixer through a liquid nitrogen pipeline, and an output port of the mixer is communicated with the environment simulation test room through a plurality of branch pipelines.

Description

Technical Field

[0001] The utility model belongs to the technical field of environmental applicability testing of electronic and electrical equipment, and particularly relates to an alpine and high-altitude environment simulation device for testing electronic and electrical equipment. Background Technique

[0002] Electronic and electrical equipment in high-altitude areas is mainly affected by aspects such as reduced atmospheric pressure, strong rain and snow, ice and snow coverage, low temperature, strong wind, low air density, and active earthquakes. The insulation, temperature rise, mechanical strength, material properties, etc. of electrical equipment will change greatly. Therefore, carrying out basic research on related technologies of electronic and electrical equipment in high-altitude and alpine environments can, on the one hand, establish more accurate theoretical support and physical parameter data in the early stage of design based on existing high-altitude electronic and electrical equipment, improve the accuracy of design and simulation, and propose targeted structural solutions. On the other hand, it can help make the altitude correction standard of electronic and electrical equipment more reasonable and contribute to the technological progress of high-altitude electronic and electrical equipment.

[0003] At present, there are many conventional environmental simulation devices. Usually, the product is placed in a constant temperature box that can heat, cool, and adjust humidity. Usually, electronic and electrical equipment is debugged and tested at conventional altitudes, and the obtained test data cannot be applied to alpine and high-altitude environments, so targeted design changes cannot be made according to the specific environmental conditions. In addition, for extreme climates, the existing technology is a large-scale wind tunnel for simulating extreme climate environments established for the automotive and aerospace fields. It can simulate climate conditions with a temperature range of -40°C to 60°C, a relative humidity range of 5% to 95%, and a maximum wind speed of 200 km / h. It can accurately simulate climate conditions such as sunlight, rain, and snow, and is used for performance testing of automobiles and aircraft in extreme climate environments. However, there are problems such as a huge space, a complicated testing process, and inability to move quickly. For the environmental simulation laboratory or device for testing electronic and electrical equipment, the simulated parameters are limited to high and low temperature conditions under normal pressure, and cannot accurately match the climate characteristics at high altitude and in alpine regions. There is a lack of a flexible and efficient ground simulation device for alpine and high-altitude climate environments. Summary of the Invention

[0004] The utility model provides an alpine and high-altitude environment simulation device for testing electronic and electrical equipment, which can simulate the operating environment of electronic and electrical equipment in alpine and high-altitude regions and can solve the problem of environmental reproduction encountered by related enterprises in developing electronic and electrical equipment for alpine and high-altitude environments.

[0005] To achieve the above object, the present utility model relates to an alpine and high altitude environment simulation device for testing electronic and electrical equipment, which includes an external air connection main pipe, a liquid nitrogen tank, and an environment simulation test chamber. A six-degree-of-freedom vibration simulation platform and a fan are arranged in the environment simulation test chamber, and a rain generating device and a snow and ice generating device are installed on the top, and the side wall is provided with an opening connected to a pressure regulating device; the inlet of the external air connection main pipe is communicated with the external environment, and the outlet is connected to the first input port of a mixer. The outlet of the liquid nitrogen tank is connected to the second input port of the mixer through a liquid nitrogen pipeline, and the output port of the mixer is communicated with the environment simulation test chamber through a plurality of branch pipelines.

[0006] Further, a liquid nitrogen regulating valve is arranged on the liquid nitrogen pipeline, and an electric regulating valve is arranged between the output port of the mixer and the plurality of branch pipelines. The nitrogen regulating valve, the electric regulating valve, the fan, the rain generating device, the snow and ice generating device, the pressure regulating device, and the six-degree-of-freedom vibration simulation platform are all electrically connected to a measurement and control system.

[0007] Further, a plurality of temperature sensors, pressure sensors, and wind speed sensors are arranged in the environment simulation test chamber, and the temperature sensors, pressure sensors, and wind speed sensors are connected to the measurement and control system.

[0008] Further, the external air connection main pipe, the liquid nitrogen tank, the mixer, the pressure regulating device, and the environment simulation test chamber are all installed on a skid-mounted environmental test laboratory.

[0009] Further, the liquid nitrogen tank is spherical or cylindrical.

[0010] Further, the liquid nitrogen tank has a vacuum insulation structure.

[0011] Further, the liquid nitrogen tank has a self-pressurizing system.

[0012] Further, the wall surface of the environment simulation test chamber is covered with a heat-insulating material.

[0013] Further, the fan is a variable-frequency fan.

[0014] Further, the rain generating device and the snow and ice generating device have nozzles with different diameters for spraying water droplets with different particle sizes and flow rates, and the nozzle directions are adjustable. The nozzles on the rain generating device and the snow and ice generating device are connected to respective branch pipes, and each branch pipe converges to a main pipe through its own regulating valve and is connected to a water tank through the main pipe.

[0015] Compared with the prior art, the present utility model has at least the following beneficial technical effects:

[0016] (1) The utility model directly contacts liquid nitrogen and air for heat exchange in the mixing chamber, and achieves the purpose of rapid cooling through the rapid evaporation of liquid nitrogen (latent heat and sensible heat). Compared with the cryogenic unit and air-conditioning unit (indirect heat exchange) used in the environmental wind tunnel, this cooling method is simple, fast, accurate, has high heat exchange efficiency, and is easy to adjust, and is very suitable for scenarios with small cooling space and small space heat load.

[0017] (2) The utility model places the liquid nitrogen tank, liquid nitrogen regulating valve, mixer, electric regulating valve, vacuum pump and connected pipelines outside the environmental simulation test chamber, and only retains the equipment necessary for environmental simulation in the environmental simulation test chamber, which is beneficial to reducing the volume of the environmental simulation test chamber, improving the utilization rate of the space, realizing the miniaturization of the environmental simulation device, being small and flexible, having the advantages of shortening the system regulation time, enhancing the system regulation sensitivity, etc., having strong scene adaptability, and being able to quickly adjust environmental parameters.

[0018] (3) The utility model uses the principle of directly sucking the gas in the environmental simulation test chamber by a vacuum pump or an ejector to form a low pressure in the environmental simulation test chamber, and then uses the pressure difference to suck the outside air into the environmental simulation test chamber, without using high-energy-consuming rotating machinery such as blowers and compressors.

[0019] (4) The environmental simulation device of the utility model can be quickly moved. Compared with the large floor area, complex system and high energy consumption of the environmental wind tunnel, it is more suitable for the testing of small electronic and electrical equipment products.

[0020] (5) The utility model uses a six-degree-of-freedom vibration simulation platform to simulate the occurrence of earthquakes, which is a function not possessed by large environmental wind tunnels.

[0021] (6) The utility model simultaneously simulates one or several of the environments such as low air pressure, strong rain and snow, low temperature, strong wind, and earthquake in alpine and high-altitude regions, achieving full coverage of environmental characteristics from sea level to alpine and high-altitude environments, and having high adaptability and universality. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the following will briefly introduce the drawings required for the description of the embodiments of the utility model. Obviously, the drawings in the following description are only some embodiments of the utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0023] Figure 1 It is a system schematic diagram of an alpine and high-altitude environmental simulation device for testing electronic and electrical equipment according to some embodiments of the utility model.

[0024] Figure 1In the figure, the reference numerals represent: 1. Main external air connection pipe; 2. Liquid nitrogen tank; 3. Liquid nitrogen regulating valve; 4. Mixer; 5. Electric regulating valve; 6. Fan; 7. Rainwater generating device; 8. Ice and snow generating device; 9. Measurement and control system; 10. Vacuum pump; 11. Electronic and electrical equipment; 12. Six-degree-of-freedom vibration simulation platform; 13. Pipeline drainage system; 14. Environmental simulation test chamber; 15. Skid-mounted environmental test laboratory.

[0025] Figure 1 The dotted line in the figure represents the control line. Specific embodiments

[0026] In order to make the objectives and technical solutions of the present utility model clearer and easier to understand, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. The specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0027] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more. In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] The alpine and high-altitude environment refers to an area with climatic characteristics such as cold, low air pressure, heavy rain and snow, strong wind, and frequent earthquake activities, such as the Sichuan-Tibet Plateau. Therefore, the basic solution of the present utility model is to simulate the above climatic characteristics under normal conditions through technical means to facilitate the test and research and development of electronic and electrical equipment in alpine and high-altitude environments.

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. The description of at least one exemplary embodiment is actually only illustrative and in no way limits the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0030] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, these technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0031] In the description of the present utility model, it should be understood that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, these terms have no special meanings and thus cannot be construed as limiting the scope of protection of the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the orientation terms is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description. Without otherwise stating, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the scope of protection of the present utility model.

[0033] Embodiment 1

[0034] As Figure 1As shown in the figure, this embodiment discloses an alpine and high-altitude environment simulation device for testing electronic and electrical equipment. The device includes: an external air connection main pipe 1, a liquid nitrogen tank 2, a liquid nitrogen regulating valve 3, a mixer 4, an electric regulating valve 5, a fan 6, a rainwater generating device 7, an ice and snow generating device 8; a measurement and control system 9, a vacuum pump 10, a six-degree-of-freedom vibration simulation platform 12, a pipeline drainage system 13, an environment simulation test chamber 14, and a skid-mounted environment test laboratory 15.

[0035] An environment simulation test chamber 14 is placed inside the skid-mounted environment test laboratory 15. A pipeline drainage system 13 for drainage is laid in the interlayer between the ground and the bottom plate of the environment simulation test chamber. A six-degree-of-freedom vibration simulation platform 12 is placed on the bottom surface of the environment simulation test chamber 14. Multiple fans 6 are placed inside the environment simulation test chamber 14, and a rainwater generating device 7 and an ice and snow generating device 8 are installed on the top. The side wall is provided with openings and is connected to multiple vacuum pumps 10; the inlet of the external air connection main pipe 1 is communicated with the external environment, and the outlet is connected to the first input port of the mixer 4. The outlet of the liquid nitrogen tank 2 is connected to the second input port of the mixer 4 through a liquid nitrogen pipeline, and a liquid nitrogen regulating valve 3 is arranged on the liquid nitrogen pipeline. The output port of the mixer 4 is connected to the inlet end of the electric regulating valve 5, and the outlet end of the electric regulating valve 5 is communicated with the environment simulation test chamber 14 through several branch pipelines.

[0036] The external air is diverted into the mixer 4 through the external air connection main pipe 1 under the driving of the pressure difference inside and outside the environment simulation test chamber 14. The liquid nitrogen flows out of the liquid nitrogen tank 2 and mixes with the air in the mixer 4 through the liquid nitrogen regulating valve 3 and several jet holes on the inner wall of the mixer 4, so as to carry out phase change heat exchange and quickly generate low-temperature mixed gas, which enters the environment simulation test chamber 14 through the shunt pipeline via the electric regulating valve 5. Several temperature sensors, pressure sensors, and wind speed sensors are arranged inside the environment simulation test chamber 14. The temperature sensors, pressure sensors, and wind speed sensors are connected to the measurement and control system 9. The measurement and control system 9 includes a host computer and an electrical control cabinet, and the host computer can display specific values in real time. One end of the electrical control cabinet of the measurement and control system 9 is connected to the liquid nitrogen regulating valve 3, the electric regulating valve 5, the fan 6, the rainwater generating device 7, the ice and snow generating device 8, the vacuum pump 10, and the six-degree-of-freedom vibration simulation platform 12 through circuits, and the other end is connected to the host computer through an NI acquisition board. The rotation speeds of the regulating valves, fans, and vacuum pumps and the servo mechanism of the six-degree-of-freedom vibration simulation platform can be controlled through the electrical control cabinet, and data such as pressure, temperature, wind speed, and vibration inside the environment simulation test chamber 14 can be collected through the NI acquisition board.

[0037] The liquid nitrogen tank 2 is spherical or cylindrical and has a vacuum insulation structure and a self-pressurization system.

[0038] The skid-mounted environmental test laboratory 15 can be moved to each electronic and electrical equipment test center as needed. The environmental simulation test chamber 14 is an enclosed space with large visual observation windows at the front and back, and meets the requirements of grounding and insulation. The pipelines and wire interfaces passing through the chamber wall are designed as sealed structures. The wall surface of the environmental simulation test chamber is lined with multiple layers of thermal insulation materials to improve the overall heat insulation performance, reduce the cold loss in the chamber, and save the consumption of liquid nitrogen during the operation of the system.

[0039] Multiple vacuum pumps 10 are connected to the inside of the environmental simulation test chamber 14 through openings on the side wall of the environmental simulation test chamber 14, and have frequency conversion adjustment and pressure holding functions. They can adjust the pressure inside the environmental simulation test chamber 14 in real time, and can form a set low-pressure environment inside the environmental simulation test chamber, and stabilize the pressure at the required negative pressure value.

[0040] Two mixers 4 are arranged in parallel. One end is connected to the outside air connection main pipe 1 through a branch pipe, and the other end is connected to the electric control valve 5 through a branch pipe. The outside air enters the mixer 4 under the drive of the pressure difference between the outside atmospheric environment and the environmental simulation test chamber 14. At the same time, the liquid nitrogen stored in the liquid nitrogen tank 2 enters the mixer 4 through the liquid nitrogen control valve 3 under the drive of the internal pressure. The mixed low-temperature gas enters the environmental simulation test chamber 14 through the electric control valve 5.

[0041] The fan 6 is a variable-frequency fan 6, and multiple fans 6 are set as needed. The placement position is determined according to the simulated wind speed and direction; multiple fans 6 stir the low-temperature gas in the environmental simulation test chamber 14 to reconstruct the airflow field in the environmental simulation test chamber 14 to simulate the required environmental wind speed.

[0042] The rain generating device 7 and the ice and snow generating device 8 are nozzles of different models and diameters, used to spray water droplets of different particle sizes and flow rates, and the nozzle directions can be adjusted. The nozzles on the rain generating device 7 and the ice and snow generating device 8 are connected to each branch pipe, and each branch pipe converges to the main pipe through its own control valve and is further connected to the water tank in the skid-mounted environmental test laboratory. Under the influence of the temperature in the environmental simulation test chamber 14, the required rainy or snowy environment is formed, and the rain is discharged from the environmental simulation test chamber 14 through the pipeline drainage system 13.

[0043] Several temperature sensors, pressure sensors and wind speed sensors are arranged in the environmental simulation test chamber 14. The temperature sensors, pressure sensors and wind speed sensors are connected to the measurement and control system 9, and the specific values are displayed in real time in the upper computer.

[0044] A six-degree-of-freedom vibration simulation platform 12 is placed on the ground of the environmental simulation test room 14. The six-degree-of-freedom vibration simulation platform 12 can adjust the amount of movement in the six-degree-of-freedom direction, and can also simulate earthquake environments of different frequencies and amplitudes according to a predetermined motion curve. The six-degree-of-freedom vibration simulation platform can choose the six-degree-of-freedom simulation dynamic platform model KCSJ-00588 of Guangzhou Kaichuang Vision Technology Co., Ltd., or the MOTION 1000 six-degree-of-freedom (6-DOF) digital control platform. During the test, the electronic and electrical equipment 11 is placed on the six-degree-of-freedom vibration simulation platform 12, and the electronic and electrical equipment 11 is connected to the test power supply through the side wall of the environmental simulation test room 14 through a wire. According to the wind speed, temperature, and pressure sensors in the environmental simulation test room 14, the staff controls the start and stop and operation status of the equipment such as the liquid nitrogen regulating valve 3, the low-temperature mixer 4, the electric regulating valve 5, the rainwater generating device 7, the ice and snow generating device 8, the vacuum pump 10, and the six-degree-of-freedom vibration simulation platform 12 to form the required comprehensive climate environment.

[0045] The low pressure environment in the high-cold and high-altitude areas is ensured by the start and stop and speed changes of multiple vacuum pumps 10; the low temperature environment in the high-cold and high-altitude areas is ensured by the ratio of air and liquid nitrogen entering the mixer 4; the wind speed in the high-cold and high-altitude areas is jointly ensured by the flow of low-temperature gas passing through the electric regulating valve 5 and the position, direction and speed changes of multiple fans 6; the earthquake intensity environment in the high-cold and high-altitude areas is ensured by the motion trajectory of the six-degree-of-freedom vibration simulation platform 12; the rain and freezing environment in the high-cold and high-altitude areas are jointly ensured by the rainwater generating device 7, the ice and snow generating device 8 and the temperature in the environmental simulation test room 14. When the temperature in the environmental simulation test room 14 is not low enough to freeze water droplets, it is rainy weather. The size of the rain is achieved by replacing nozzles of different diameters and controlling the flow of the nozzles, and the falling rain is discharged through the ground pipe drainage system 13. On the contrary, when the temperature in the environmental simulation test room 14 is low enough to freeze water droplets quickly, it is ice and snow weather.

[0046] The accurate simulation of the above environmental conditions is achieved by controlling the opening of the liquid nitrogen regulating valve 3, the opening of the electric regulating valve 5, the direction and speed of the multiple fans 6, and the start and stop and speed changes of the multiple vacuum pumps 10.

[0047] To sum up, according to the specific situation, one or more of the low pressure, heavy rain and snow, low temperature, strong wind, earthquake and other environments in high-altitude and cold areas can be simulated at the same time, in order to achieve full coverage of the actual environment and expand the adaptability and breadth of the invention.

[0048] The high-cold and high-altitude environment simulation device can simulate low pressure, low temperature, rain and snow, strong winds, earthquakes and other scenes in the corresponding areas simultaneously or individually, and has the ability to operate continuously.

[0049] It should be noted that the environmental simulation test chamber 14 ensures airtightness through methods such as pipeline sealing rings, box body sealants, and flexible nested structures. Especially at the positions where pipelines and lines interact, it prevents external air from seeping in through the gaps in the box wall, resulting in the inability of the air flow pressure and temperature in the environmental simulation test chamber 14 to reach the set values.

[0050] The application range of the alpine and high altitude environmental simulation device for electronic and electrical equipment testing proposed by the present utility model is: altitude 0 - 4000m, wind speed 0 - 30m / s, temperature -50 - 60°C, earthquake intensity 2 - 8 magnitude. It achieves full coverage of environmental characteristics from sea level to alpine and high altitude, and has the advantages of a wide parameter coverage range, fast response time, small environmental impact, and high automation. Moreover, this device can be flexibly moved and has strong applicability. It can be used in the design and test stages of electronic and electrical equipment for alpine and high altitude regions, greatly reducing the development cycle and test cost of electronic and electrical equipment for alpine and high altitude environments, and can fully verify the product performance of related equipment.

[0051] Embodiment 2

[0052] The difference between this embodiment and Embodiment 1 is as follows:

[0053] In Embodiment 1, multiple vacuum pumps are used for suction to achieve a low-pressure environment in the environmental simulation test chamber. In this embodiment, an ejector is used to achieve a low-pressure environment in the environmental simulation test chamber.

[0054] Specifically, the first end (secondary fluid) of the ejector is connected to the side wall opening of the environmental simulation test chamber 14, the second end (primary fluid) is connected to a high-pressure air source, and the third end (ejector outlet) is connected to the outside atmosphere. Relying on the ejecting effect of the high-pressure air source, a negative pressure is formed in the cavity where the low-pressure fluid is located, and the air in the environmental simulation test chamber 14 is continuously pumped out to the outside environment, forming a low-pressure effect in the environmental simulation test chamber 14.

[0055] The working principle of the ejector is as follows: The fluid with a higher pressure is the working fluid (also known as the primary fluid), which flows out of the nozzle at a very high speed and enters the mixing chamber. Under the turbulent diffusion effect of the jet, it entrains the surrounding fluid with a lower pressure. The fluid with a lower pressure being inhaled is the entrained fluid (also known as the secondary fluid). The working fluid and the entrained fluid are mixed in the mixing chamber, and momentum exchange occurs. During the flow process, the velocity distribution gradually becomes uniform, and often accompanied by an increase in pressure. Subsequently, the mixed fluid enters the diffuser chamber, and the pressure increases due to the decrease in flow velocity. At the outlet of the diffuser chamber, the pressure of the mixed fluid is higher than the pressure of the entrained fluid entering the receiving chamber. Simply put, it is to use a high-pressure fluid to eject another low-pressure fluid, which can form a negative pressure in the cavity where the low-pressure fluid is located, achieving the effect of low air pressure in a high-altitude environment.

[0056] The most important advantage of an ejector is that it does not directly consume mechanical energy and electrical energy. The main disadvantage of an ejector is its relatively low energy transfer efficiency, which is due to the large energy losses generated when the two fluid streams are mixed, and the fact that a high-pressure fluid (primary fluid) source is not easily obtained. Additionally, it is not easily adjustable during operation due to the lack of moving parts.

[0057] Embodiment 3

[0058] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, liquid nitrogen and air are directly contacted and heat exchanged in the mixing chamber to achieve rapid cooling through the rapid evaporation (latent heat and sensible heat) of liquid nitrogen. In this embodiment, a compact cryogenic air conditioner unit is used to achieve the same purpose.

[0059] Although some specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

[0060] The above content is only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any modification made on the basis of the technical solution according to the technical idea proposed by the present invention falls within the protection scope of the claims of the present invention.

Claims

1. A high-cold and high-altitude environment simulation device for testing electronic and electrical equipment, characterized in that: The invention comprises an external air connection main pipe (1), a liquid nitrogen tank (2), and an environmental simulation test room (14); a six-degree-of-freedom vibration simulation platform (12) and a fan (6) are arranged in the environmental simulation test room (14); a rainwater generating device (7) and an ice and snow generating device (8) are arranged on the top; and a side wall opening is connected to a pressure regulating device; The inlet of the external air connection main pipe (1) is connected to the external environment, and the outlet is connected to the first input port of the mixer (4); the outlet of the liquid nitrogen tank (2) is connected to the second input port of the mixer (4) through a liquid nitrogen pipeline; and the output port of the mixer (4) is connected to the environmental simulation test room (14) through a plurality of branch pipelines.

2. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: A liquid nitrogen regulating valve (3) is provided on the liquid nitrogen pipeline, an electric regulating valve (5) is provided between the output port of the mixer (4) and the plurality of branch pipelines, and the nitrogen regulating valve (3), the electric regulating valve (5), the fan (6), the rainwater generating device (7), the ice and snow generating device (8), the pressure regulating device, and the six-degree-of-freedom vibration simulation platform (12) are all electrically connected to a measurement and control system (9).

3. A high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1 or 2, characterized in that: A plurality of temperature sensors, pressure sensors and wind speed sensors are arranged in the environmental simulation test room (14), and the temperature sensors, pressure sensors and wind speed sensors are connected to the measurement and control system (9).

4. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: The external air connection main pipe (1), the liquid nitrogen tank (2), the mixer (4), the pressure regulating device and the environmental simulation test room (14) are all installed on the skid-mounted environmental test laboratory (15).

5. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: The liquid nitrogen tank (2) is spherical or cylindrical.

6. A high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1 or 5, characterized in that: The liquid nitrogen tank (2) has a vacuum heat-insulating structure.

7. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 6, characterized in that: The liquid nitrogen tank (2) has a self-pressurizing system.

8. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: The wall surface of the environmental simulation test room (14) is covered with thermal insulation material.

9. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: The fan (6) is a variable frequency fan.

10. The high-cold and high-altitude environment simulation device for testing electronic and electrical equipment according to claim 1, characterized in that: The rainwater generating device (7) and the ice and snow generating device (8) have nozzles of different diameters for spraying water droplets of different particle sizes and flow rates, and the directions of the nozzles are adjustable. The nozzles on the rainwater generating device (7) and the ice and snow generating device (8) are connected to the branch pipes, and the branch pipes are connected to the main pipe through their own regulating valves, and are connected to the water tank through the main pipe.

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