A space environment simulator for multiple sample hot vacuum testing

Abstract

The application discloses a space environment simulator for multiple sample hot vacuum tests, and relates to the field of spacecraft thermal environment test simulation devices.The space environment simulator comprises a box body and a box door, and heat sink plates are arranged on the inner walls of the box body and the box door.A plurality of horizontal heat sink partitions and a plurality of vertical heat sink partitions are arranged in the box body, and the horizontal heat sink partitions and the vertical heat sink partitions divide the internal space of the box body into a plurality of sample spaces.A loading platform and a heating device are arranged in each of the sample spaces.Liquid nitrogen pipelines are arranged in the heat sink plates, the horizontal heat sink partitions and the vertical heat sink partitions, and the liquid nitrogen pipelines are connected to a liquid nitrogen storage tank outside the box body through pipelines.The space in the box body is divided into a plurality of temperature-independent sample spaces by the horizontal heat sink partitions and the vertical heat sink partitions, the temperature control in each sample space is relatively independent, the mutual influence of temperature adjustment in the spaces between products can be eliminated, and the cost of tests is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spacecraft thermal environment test simulation devices, in particular to a space environment simulator for multi-sample thermal vacuum test. BACKGROUND

[0002] Before launch, aerospace products from components, subsystems to satellites need to be subjected to thermal vacuum test to verify whether the working performance indicators of the aerospace products in various working modes in orbit meet the requirements. The thermal vacuum test generally lasts for several days to more than ten days, and the cost of the test is relatively high because the equipment needs to use liquid nitrogen all the time. With the increase of batch type model tasks and the demand for low-cost civil aerospace, how to perform thermal vacuum test on multiple single machines in one vacuum tank, reduce the test cost, shorten the test period, and at the same time ensure that the temperature control of different products does not affect each other, has gradually become a research focus of environmental engineers.

[0003] In the prior art, when testing multiple samples, a thin electric heater is generally attached to the samples to independently control the temperature of each sample. However, this method is only suitable for samples with flat surfaces, and the samples need to be separated by a certain distance, which occupies a large area. In addition, the space between the samples leads to heat loss, resulting in high energy consumption and cost during the test. The second method is to independently install a heating cage for each product: multiple heating cages independently control the temperature. Compared with the product surface attached with a thin film type electric heater, this method does not have the requirement of product shape. Both methods have the problem of blocking, affecting heat dissipation and temperature control, and there is a limitation that the temperature needs to be raised and lowered simultaneously during the test, which requires a pre-test plan and reasonable layout. The disclosed "multi-device thermal vacuum test device" with publication number CN201711441359.2 can effectively improve the efficiency and save the cost by installing several devices on a heat conduction plate. However, all the samples tested can only achieve the same temperature, and there is no universality when the test temperatures and heating rates of multiple samples are different. SUMMARY

[0004] In view of the above shortcomings of the prior art, the present application provides a space environment simulator for multi-sample thermal vacuum test, which can independently control the test temperature of each sample and avoid the mutual influence of multiple samples.

[0005] To achieve the above-mentioned application purposes, the technical solution adopted by the present application is as follows:

[0006] A space environment simulator for multi-sample thermal vacuum testing is provided, comprising a chamber and a door. The inner walls of the chamber and the door are lined with heat sink plates. The chamber contains several horizontal and vertical heat sink partitions, which divide the internal space of the chamber into several sample spaces. Each sample space is equipped with a loading platform and heating equipment. Liquid nitrogen pipelines are installed inside the heat sink plates, the horizontal and vertical heat sink partitions, and the liquid nitrogen pipelines are connected to a liquid nitrogen storage tank located outside the chamber via pipes.

[0007] Furthermore, the bottom of the platform is equipped with pulleys; the top surface of the transverse heat sink baffle is provided with guide grooves that cooperate with the pulleys. The platform and pulleys facilitate the loading of samples into the sample space.

[0008] Furthermore, each of the aforementioned pipes is equipped with a valve, and the valve is located outside the casing.

[0009] Furthermore, it also includes a vacuum pump, which is located on the outside of the chamber and is connected to the interior space of the chamber through a suction pipe.

[0010] Furthermore, heat-resistant sealing strips are installed at the joints between the cabinet doors.

[0011] Furthermore, the surfaces of the heat sink plate, several horizontal heat sink partitions, and several vertical heat sink partitions are all covered with an aerospace black paint layer, the surface emissivity of which is greater than or equal to 0.88.

[0012] Furthermore, the bottom surface of the transverse heat sink partition is provided with reinforcing ribs.

[0013] Furthermore, the heating device is an infrared heating cage or a standard heating element 7.

[0014] Furthermore, liquid nitrogen loop pipes are installed inside the heat sink plate, several horizontal heat sink partitions, and several vertical heat sink partitions. The liquid nitrogen loop pipes are connected to the liquid nitrogen pipeline, and the output end of the liquid nitrogen loop pipes is connected to the input end of the liquid nitrogen storage tank.

[0015] The beneficial effects of this invention are as follows:

[0016] This invention divides the internal space of the chamber into several temperature-independent sample spaces via horizontal and vertical heat sink partitions. Liquid nitrogen is pumped into the heat sinks, horizontal and vertical partitions through pipes, thereby blocking heat exchange between adjacent sample spaces. Heating equipment is used to raise or lower the temperature of the samples within each space, ensuring relatively independent temperature control in each sample space. This eliminates mutual influence between the temperature control of different sample spaces, enabling precise temperature control for each sample during batch thermal vacuum testing. Furthermore, this device has a simple structure, with multiple sample spaces compactly arranged, resulting in high space utilization and minimizing the need for a large testing area, thus effectively saving testing costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the transverse heat sink partition;

[0020] Figure 4 This is a top sectional view of the transverse heat sink partition.

[0021] The components include: 1. Box body; 2. Box door; 3. Heat sink plate; 4. Horizontal heat sink partition; 5. Vertical heat sink partition; 6. Sample space; 7. Standard heating element; 8. Liquid nitrogen pipeline; 9. Loading platform; 10. Pulley; 11. Guide groove; 12. Valve; 13. Vacuum pump; 14. Evacuation pipe; 15. Heat-resistant sealing strip; 17. Reinforcing rib; 18. Liquid nitrogen loop pipeline; 19. Liquid nitrogen storage tank. Detailed Implementation

[0022] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0023] like Figures 1-4As shown, a space environment simulator for multi-sample thermal vacuum testing includes a housing 1 and a door 2. Heat sink plates 3 are laid on the inner walls of both the housing 1 and the door 2. Several horizontal heat sink partitions 4 and several vertical heat sink partitions 5 are arranged inside the housing 1, dividing the internal space of the housing 1 into several sample spaces 6. First grooves that mate with the horizontal heat sink partitions 4 are provided on the side walls of the housing 1, and the horizontal heat sink partitions 4 are engaged in the first grooves on the side walls of the housing 1. The top and bottom surfaces of the horizontal heat sink partitions 4 are provided with grooves that mate with the vertical heat sink partitions 5. The vertical heat sink partition 5 is engaged in the second groove on the horizontal heat sink partition 4, or in the third groove on the top or bottom surface of the housing 1. Simultaneously, the side of the vertical heat sink partition 5 also has a fourth groove that engages with the horizontal heat sink partition 4, enabling the subdivision of the sample space 6. The horizontal heat sink partition 4 and the vertical heat sink partition 5 are adjustable through the engagement, facilitating the adjustment of the size of each sample space 6. This allows for easy adjustment of the sample space 6 according to the number and size of samples during actual use, improving the space utilization rate within the housing 1. The bottom surface of the horizontal heat sink partition 4 is provided with reinforcing ribs 1 to increase the supporting force of the horizontal heat sink partition 4 and prevent the samples loaded in the sample space 6 from bending and damaging the horizontal heat sink partition 4.

[0024] Each of the sample spaces 6 is equipped with a loading platform 9 and heating equipment. Depending on actual cost and temperature requirements, the heating equipment can be an infrared heating cage or a standard heating element 7. The infrared heating cage can achieve a higher temperature in the sample space 6 compared to the standard heating element 7, but its cost is higher. In this embodiment, the standard heating element 7 is used. Liquid nitrogen pipelines 8 are installed inside the heat sink plate 3, several horizontal heat sink partitions 4, and several vertical heat sink partitions 5. These liquid nitrogen pipelines 8 are connected to a liquid nitrogen storage tank 19 located outside the housing 1 via pipes. Figure 4 As shown in the top sectional view of the transverse heat sink baffle 4, the liquid nitrogen pipeline 8 is S-shaped. The internal structure of the heat sink plate 3 and the vertical heat sink baffle 5 is similar to that of the transverse heat sink baffle 4, so they are not illustrated in the figure.

[0025] The bottom of the loading platform 9 is provided with a pulley 10; the top surface of the transverse heat sink partition 4 is provided with a guide groove 11 that cooperates with the pulley 10. The pulley 10 and the guide groove 11 prevent the sample from contacting and rubbing against the surface of the transverse heat sink partition 4 when loading the sample, thereby effectively preventing the aerospace black paint layer on the surface of the transverse heat sink partition 4 from being scratched when loading the sample.

[0026] Each of the aforementioned pipes is equipped with a valve 12, which is located outside the housing 1. By controlling the degree of closure of the valve 12, the flow rate of liquid nitrogen is adjusted, thereby controlling the temperature of the two adjacent sample spaces 6 that are isolated from each other.

[0027] It also includes a vacuum pump 13, which is located on the outside of the housing 1 and is connected to the interior space of the housing 1 through a vacuum pipe 14.

[0028] A heat-resistant sealing strip 15 is provided at the connection between the two doors 2. The heat-resistant sealing strip 15 is made of silicone rubber ring.

[0029] The surfaces of the heat sink plate 3, several transverse heat sink partitions 4, and several vertical heat sink partitions 5 are all covered with an aerospace black paint layer, the surface emissivity of which is greater than or equal to 0.88. In actual use, the surface of the reinforcing rib 1 is also covered with an aerospace black paint layer to prevent the reinforcing rib 1 from accumulating heat, which would lead to uneven heat distribution in the sample space 6, thus avoiding a decrease in test accuracy.

[0030] The heat sink plate 3, several horizontal heat sink partitions 4, and several vertical heat sink partitions 5 are all equipped with liquid nitrogen loop pipes 18. The liquid nitrogen loop pipes 18 are connected to the liquid nitrogen pipeline 8, and the output end of the liquid nitrogen loop pipes 18 is connected to the input end of the liquid nitrogen storage tank 19. The liquid nitrogen loop pipes 18 recover excess liquid nitrogen in the liquid nitrogen pipeline 8; on the other hand, they can discharge the nitrogen gas generated after the liquid nitrogen undergoes heat exchange, without affecting the gas pressure in the chamber 1; furthermore, the flowing liquid nitrogen can achieve faster heat exchange, quickly creating a low-temperature environment for the sample space, which is convenient for sample cooling.

[0031] The usage process and working principle of this invention:

[0032] The number and size of the horizontal heat sink partitions 4 and vertical heat sink partitions 5 are determined according to the number and size of the samples. Several horizontal heat sink partitions 4 and several vertical heat sink partitions 5 are loaded into the housing 1, dividing the space inside the housing 1 into several sample spaces 6. Heating equipment is installed in each sample space 6. In actual use, each sample space 6 is also equipped with a temperature sensor. Outside the housing 1, the samples are loaded onto the loading platform 9. The loading platform 9 is pushed, and the pulleys 10, guided by the guide grooves 11, cause the loading platform 9 to carry the samples onto the loading platform. In space 6, the chamber door 2 is closed, and the vacuum pump 13 operates to simulate a vacuum environment inside chamber 1 according to the test settings. The liquid nitrogen storage tank 19 operates to pump liquid nitrogen into the liquid nitrogen pipeline 8 inside the heat sink plate 3, several horizontal heat sink partitions 4, and several vertical heat sink partitions 5. Excess liquid nitrogen and generated nitrogen gas flow out from the liquid nitrogen loop pipeline 18 through heat-resistant and pressure-resistant pipelines. The heating equipment operates to heat the sample in the sample space 6. The power of the heating equipment in the corresponding sample space 6 is adjusted according to the temperature feedback from the temperature sensor to complete the heating and cooling process set in the test and complete the thermal vacuum test.

Claims

1. A space environment simulator for multi-sample thermal vacuum testing, characterized in that, The enclosure includes a box body (1) and a door (2). The inner walls of the box body (1) and the door (2) are covered with heat sink plates (3). The box body (1) is provided with several horizontal heat sink partitions (4) and several vertical heat sink partitions (5). The several horizontal heat sink partitions (4) and several vertical heat sink partitions (5) divide the internal space of the box body (1) into several sample spaces (6). Each of the several sample spaces (6) is provided with a loading platform (9) and a heating device. The heat sink plates (3), several horizontal heat sink partitions (4) and several vertical heat sink partitions (5) are all provided with liquid nitrogen pipelines (8). The several liquid nitrogen pipelines (8) are respectively connected to the liquid nitrogen storage tank (19) located outside the box body (1) through pipes. The bottom end of the loading platform (9) is provided with a pulley (10); the top surface of the transverse heat sink partition (4) is provided with a guide groove (11) that cooperates with the pulley (10). The heat sink plate (3), several horizontal heat sink partitions (4) and several vertical heat sink partitions (5) are all equipped with liquid nitrogen circuit pipes (18). The liquid nitrogen circuit pipes (18) are connected to the liquid nitrogen pipeline (8), and the output end of the liquid nitrogen circuit pipes (18) is connected to the input end of the liquid nitrogen storage tank (19).

2. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, Each of the pipes is equipped with a valve (12), and the valve (12) is located outside the housing (1).

3. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, It also includes a vacuum pump (13), which is located outside the housing (1) and is connected to the interior space of the housing (1) through a suction pipe (14).

4. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, A heat-resistant sealing strip (15) is provided at the connection between the door (2) and the body (1).

5. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, The surfaces of the heat sink plate (3), several horizontal heat sink partitions (4) and several vertical heat sink partitions (5) are all covered with an aerospace black paint layer, and the surface emissivity of the aerospace black paint layer is greater than or equal to 0.

88.

6. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, The bottom surface of the transverse heat sink partition (4) is provided with reinforcing ribs (17).

7. The space environment simulator for multi-sample thermal vacuum testing according to claim 1, characterized in that, The heating device is an infrared heating cage or a standard heating element (7).

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