A rapid deployment hot vacuum test apparatus

Abstract

The application discloses a kind of quick deployment hot vacuum test device, including vacuum container and vacuum air extractor unit, the vacuum container is installed on support platform, the inner side wall of the vacuum container is provided with same body heat sink, the inner side of the same body heat sink is provided with cold plate, the front end of the vacuum container is hingedly provided with container cover plate, the support platform is fixedly installed with electric control cabinet, the vacuum container is fixedly connected with support platform by mounting assembly.The application adopts PID temperature control mode to divide the vacuum container into five areas, including container cover plate, vacuum container three stages and container bottom end, for temperature control heating, which achieves temperature uniformity and improves energy utilization rate. The cold plate is used for heat conduction auxiliary temperature control, which improves the temperature rising and falling rate of the product.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum experiment, in particular to a thermal vacuum test device capable of rapid deployment. BACKGROUND

[0002] The vacuum test box is an environmental test device for simulating space vacuum and temperature environment, mainly used for the high-temperature and low-temperature cycle test, vacuum discharge test and micro-discharge test of electronic components and parts of spacecraft in simulated vacuum environment, and is an essential high-tech environmental test device for satellites, spaceships and moon exploration projects in China. A large number of electronic components and parts of spacecraft need to be tested in a low-temperature cold black vacuum environment. Since the vacuum test box is mainly used for testing space instruments, the system is an oil-free and magnetic-free vacuum system to prevent the tested devices from being contaminated. The device is installed in a clean room, has small environmental pollution and noise.

[0003] The existing thermal vacuum test equipment cannot ensure the uniformity of the temperature inside the vacuum container, has large power consumption, and is inconvenient for the thermal vacuum test. SUMMARY

[0004] The present application aims to provide a thermal vacuum test device capable of rapid deployment to solve the problems in the background art.

[0005] To solve the above technical problems, the present application provides the following technical scheme: a thermal vacuum test device capable of rapid deployment, comprising a vacuum container and a vacuum air extractor unit, the vacuum container is installed on a support platform, a same-body heat sink is arranged on the inner side wall of the vacuum container, a cold plate is arranged on the inner side of the same-body heat sink, a container cover plate is hingedly arranged at the front end of the vacuum container, an electric control cabinet is fixedly installed on the support platform, and the vacuum container is fixedly connected with the support platform through a mounting assembly.

[0006] In a preferred embodiment, a door heat sink is fixedly installed on the inner side wall of the container cover plate, and a bottom heat sink is arranged at the tail end of the same-body heat sink away from the container cover plate.

[0007] In a preferred embodiment, a plurality of flange interfaces are arranged on the outer side wall of the vacuum container, and the plurality of flange interfaces include a vacuum extraction interface, a vacuum measurement interface, a functional interface and a test flange interface.

[0008] In a preferred embodiment, the same-body heat sink and the door heat sink are fixedly arranged on the vacuum container and the container cover plate, respectively.

[0009] In a preferred embodiment, the same body heat sink is internally provided with a cold plate made of metal material, both ends of the cold plate are provided with a four fluorine wheel, the four fluorine wheel is slidingly arranged on the guide rail, the cold plate is cooled by liquid nitrogen, and the inside is provided with a heating wire.

[0010] In a preferred embodiment, the vacuum air exhaust unit comprises a molecular pump exhaust system and a low temperature pump exhaust system, the molecular pump exhaust system comprises a rough vacuum pre-pump and a molecular pump, both the rough vacuum pre-pump and the molecular pump are communicated with the vacuum container through metal bellows, a rough pumping valve and a molecular pump valve are respectively arranged on the two metal bellows, the low temperature pump exhaust system comprises a front stage dry pump and a low temperature pump, both the front stage dry pump and the low temperature pump are communicated with the vacuum container through a metal bellows, a gas discharge valve and a low temperature pump main valve are arranged on the metal bellows, a pre-pumping valve is arranged between the low temperature pump and the front stage dry pump, and a front stage valve is arranged between the front stage dry pump and the molecular pump.

[0011] In a preferred embodiment, two liquid nitrogen storage tanks are further included, the two liquid nitrogen storage tanks are connected with the cold plate, the same body heat sink, the door heat sink and the bottom heat sink inside the vacuum container through low temperature hoses, control valve systems are arranged on the low temperature hoses, temperature control display intelligent instruments, vacuum measurement display instruments, vacuum system control power supplies, switch state display lamps and fault alarm warning lamps are arranged inside the electric control cabinet, the PID temperature control mode inside the vacuum container is electrically connected with the electric control cabinet, and the electric control cabinet is electrically connected with the vacuum air exhaust unit and the control valve systems on the low temperature hoses.

[0012] In a preferred embodiment, the mounting assembly comprises a fixing piece fixedly arranged at the upper end of the support platform, an arc-shaped supporting piece is fixedly arranged at the upper end of the fixing piece, a cavity is formed in the middle position of the fixing piece, a jack rod is arranged inside the cavity, the upper end of the jack rod penetrates through the arc-shaped supporting piece, the lower end of the jack rod is fixedly connected with a lifting plate arranged inside the cavity, a connecting rod is arranged at one end of the lifting plate, a clamping piece is hingedly arranged at the upper end of the connecting rod, one end of the clamping piece penetrates through the arc-shaped supporting piece and is clamped into a clamping groove in the outer side wall of the vacuum container.

[0013] In a preferred embodiment, a sliding groove is formed in the inner side wall of the cavity, a sliding block is fixedly arranged on the outer side wall of the lifting plate, the sliding block is slidingly arranged in the sliding groove, and a return spring is fixedly arranged at the bottom end of the lifting plate.

[0014] In a preferred embodiment, a mounting groove is formed in the side wall of the lifting plate, an extrusion spring is fixedly arranged in the mounting groove, one end of the extrusion spring is fixedly connected with the connecting rod, a plurality of locking holes are formed in the connecting rod, and a locking bolt is arranged at the locking hole.

[0015] Compared with the prior art, the present application has the advantages of:

[0016] The present application can form an optically shielded cold black environment inside the vacuum container by providing a same-body heat sink plate, a door heat sink, a bottom heat sink and a cold plate inside the vacuum container. The cold plate has temperature rising and falling functions by being provided with steel pipes and heating wires. The vacuum degree inside the vacuum container is controlled by a vacuum air extractor set composed of a molecular pump air extraction system and a low-temperature pump air extraction system. The two air extraction systems can be independently operated or jointly used, so that the vacuum performance of the vacuum container is stable. The vacuum container is divided into five areas, i.e. a container cover plate, a vacuum container three-area and a container bottom end, for temperature control and heating by using a PID temperature control method, so that temperature uniformity is achieved and energy utilization is improved.

[0017] The vacuum container is installed on the support platform by the installation assembly. When the vacuum container is pressed on the top rod under the action of gravity, the top rod moves downward, so that the lifting plate and the connecting rod move downward, so that the clamping piece is clamped into the clamping groove outside the vacuum container, the clamping and fixing of the vacuum container are realized, the installation and dismounting of the vacuum container are facilitated, and the replacement or maintenance of the vacuum container is facilitated. DETAILED DESCRIPTION

[0018] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate the present application and explain the principles of the present application, and do not constitute a limitation of the present application. In the drawings:

[0019] Figure 1 is a schematic diagram of the overall structure of the present application;

[0020] Figure 2 is a schematic diagram of the local structure of the cold plate inside the vacuum container of the present application;

[0021] Figure 3 is a schematic diagram of the structure of the vacuum air extractor set of the present application;

[0022] Figure 4 is a schematic diagram of the installation structure of the vacuum container of the present application;

[0023] Figure 5 is an enlarged schematic diagram of the structure at A in the present application; Figure 4

[0024] Figure 6 is a schematic diagram of the connection structure of the lifting plate and the connecting rod of the present application;

[0025] ​In the figure: 1 vacuum container; 2 vacuum air extractor set; 3 locking bolt; 4 same-body heat sink; 5 container cover plate; 6 support platform; 7 electric control cabinet; 8 door heat sink; 9 flange interface; 10 cold plate; 11 four-fluorine wheel; 12 guide rail; 13 rough vacuum pre-extraction pump; 14 molecular pump; 15 rough extraction valve; 16 molecular pump valve; 17 front-stage dry pump; 18 cryogenic pump; 19 air release valve; 20 cryogenic pump main valve; 21 pre-extraction valve; 22 front-stage valve; 23 liquid nitrogen storage tank; 24 fixing piece; 25 arc-shaped support piece; 26 cavity; 27 top rod; 28 lifting plate; 29 connecting rod; 30 clamping piece; 31 clamping groove; 32 sliding block; 33 return spring; 34 mounting groove; 35 extrusion spring; 36 locking hole. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0027] Please refer to Figures 1-6 The present application provides a rapid deployment thermal vacuum test device, which comprises a vacuum container 1 and a vacuum air extractor set 2. The vacuum container 1 is installed on a support platform 6. A same-body heat sink 4 is arranged on the inner side wall of the vacuum container 1. The inner side of the same-body heat sink 4 is provided with a cold plate 10. The front end of the vacuum container 1 is hingedly provided with a container cover plate 5. An electric control cabinet 7 is fixedly installed on the support platform 6. The vacuum container 1 is fixedly connected with the support platform 6 through a mounting assembly.

[0028] In a preferred embodiment, a door heat sink 8 is fixedly installed on the inner side wall of the container cover plate 5. A bottom heat sink is arranged at the tail end of the same-body heat sink 4 away from the container cover plate 5.

[0029] In specific implementation, the same-body heat sink 4 and the door heat sink 8 simulate the cold black environment of space. The same-body heat sink 4, the door heat sink 8 and the bottom heat sink form a cold black environment with optical shielding. The inside is sprayed with aviation black paint to improve the radiation capacity of temperature. The same-body heat sink 4, the door heat sink 8, the bottom heat sink and the cold plate 10 are divided into four groups to realize the function of liquid nitrogen deep cooling, so as to save power consumption and improve efficiency.

[0030] In a preferred embodiment, a plurality of flange interfaces 9 are arranged on the outer side wall of the vacuum container 1. The plurality of flange interfaces 9 include a vacuum extraction interface, a vacuum measurement interface, a functional interface and a test flange interface. In specific implementation, the number of flange interfaces can be increased or decreased according to actual needs.

[0031] In a preferred embodiment, the same body heat sink 4 and the door heat sink 8 are fixedly arranged on the vacuum container 1 and the container cover plate 5 respectively.

[0032] In a preferred embodiment, the inside lower end of the same body heat sink 4 is provided with a cold plate 10 made of metal material, both ends of the cold plate 10 are provided with a Teflon wheel 11 which is slidingly arranged on a guide rail 12, the cold plate 10 is cooled by liquid nitrogen and is internally provided with a heating wire.

[0033] In a specific implementation, the cold plate 10 is made of metal material, the plate is folded (to improve strength and reduce heat capacity) and is welded with a copper pipe by using silver copper solder, the surface of the welding point is smooth to reduce the air output and improve the vacuum performance of the equipment, the inside has a heating wire for heating the cold plate 10, the cold plate 10 is located at the inside lower end of the same body heat sink 4 and slides on the guide rail 12 through the Teflon wheel 11 (which has a heat insulation effect), when the workpiece is loaded, the cold plate is moved out by using a corrugated hose at the tail of the cold plate, which is convenient for loading and unloading, the cold plate has a temperature rising and falling function, and the temperature control range is 90K-350K.

[0034] In a preferred embodiment, the vacuum air exhaust unit 2 comprises a molecular pump air exhaust system and a low temperature pump air exhaust system, the molecular pump air exhaust system comprises a rough vacuum pre-pumping pump 13 and a molecular pump 14, the rough vacuum pre-pumping pump 13 and the molecular pump 14 are both communicated with the vacuum container 1 through metal bellows, the two metal bellows are respectively provided with a rough pumping valve 15 and a molecular pump valve 16, the low temperature pump air exhaust system comprises a front-stage dry pump 17 and a low temperature pump 18, the front-stage dry pump 17 and the low temperature pump 18 are both communicated with the vacuum container 1 through metal bellows, the metal bellows is provided with a gas exhaust valve 19 and a low temperature pump main valve 20, a pre-pumping valve 21 is arranged between the low temperature pump 18 and the front-stage dry pump 17, and a front-stage valve 22 is arranged between the front-stage dry pump 17 and the molecular pump 14.

[0035] In a specific implementation, the rough vacuum pre-pumping pump 13 selects a dry vacuum pump with a pumping speed of 630m 3 / H, the molecular pump 14 selects a magnetic suspension turbine molecular pump with a pumping speed of 2200m 3 / H, and the low temperature pump 18 has a pumping speed of 10000m 3 / H.

[0036] In a preferred embodiment, two liquid nitrogen storage tanks 23 are further included, which are connected with the same heat sink 4, cold plate 10, door heat sink 8 and bottom heat sink inside the vacuum container 1 through low-temperature hoses, and a control valve system is arranged on the low-temperature hoses, and a temperature control display intelligent instrument, vacuum measurement display instrument, vacuum system control power supply, switch state display lamp and fault alarm warning lamp are arranged inside the electric control cabinet 7, the PID temperature control mode inside the vacuum container 1 is electrically connected with the electric control cabinet 7, and the electric control cabinet 7 is electrically connected with the vacuum air extractor set 2 and the control valve system on the low-temperature hoses.

[0037] When the low-temperature test is performed inside the vacuum container 1, the wall temperature of the heat sink is reduced to about -90℃, and there are three temperatures of the heat sink wall temperature, space temperature and test piece temperature in the vacuum container 1 during the test. The temperature error allowed by the test piece cold immersion test is automatically controlled by the computer, and when the test piece reaches the temperature, the heat sink wall temperature and the temperature change on the test piece are basically consistent in the case of automatic stop; when the upper limit of the test piece temperature error (the value can be arbitrarily set) is reached, the three cascade refrigeration machine systems are automatically started by the computer electric contact point instruction control;

[0038] When the test piece liquid nitrogen flow does the low-temperature test, the wall temperature of the heat sink needs to be reduced to about -180℃, at which time the liquid nitrogen flow is started. The liquid nitrogen flow is composed of two 495L horizontal liquid nitrogen storage tanks, four low-temperature valves and low-temperature hoses, etc. The liquid nitrogen in the liquid nitrogen storage tank 23 enters the heat sink plate through the electromagnetic valve, and the pressure difference of the liquid nitrogen in the storage tank is used to press the liquid nitrogen into the heat sink plate to achieve the purpose of cooling. The operation process is to close the vent valve and open the liquid outlet valve to press the liquid nitrogen into the heat sink plate. The computer controls the opening and closing of the electromagnetic valve through the temperature feedback signal, so as to realize the purpose of temperature control and adjustment. The two liquid nitrogen tanks are used alternately to ensure the continuous operation of the test;

[0039] During the test process, the heating system adopts Ni80Cr20 wire heating, which is divided into five heating modes of door cover, cylinder body 3 paths and cylinder bottom, which can not only achieve temperature uniformity but also improve the energy utilization rate. The temperature control mode adopts the PID temperature control mode of the temperature control instrument, compares the measured heat sink wall temperature with the measured value, outputs a pulse signal to trigger a solid-state relay, and changes the on-off ratio of the solid-state relay to change the heating power of the resistance wire;

[0040] The temperature measurement data during the test process of the application are as follows:

[0041] The temperature deviation of the equipment is +0.51C~-1.33C at +150℃;

[0042] +1.09C~-0.54C at +60℃;

[0043] +1.8C ~-2.46℃ at -40℃;

[0044] +2.75 ~ -2.98 °C at -150 °C.

[0045] Device temperature fluctuation: 0.03 °C at +150 °C;

[0046] 0.48 °C at +60 °C;

[0047] 0.07 °C at -40 °C;

[0048] 0.02 °C at -150 °C.

[0049] Device temperature uniformity: 1.78 °C at +150 °C;

[0050] 0.99 °C at +60 °C;

[0051] 4.11 °C at -40 °C;

[0052] 5.64 °C at -150 °C.

[0053] The heat sink heating rate reaches 3.5 °C / min, and the cooling rate reaches 4.7 °C / min (note: load 50 Kg aluminum ingot + 200 W heat source).

[0054] In a preferred embodiment, the mounting assembly comprises a fixed part 24 fixedly arranged at the upper end of the support platform 6, the upper end of the fixed part 24 is fixedly arranged with an arc-shaped support part 25, a cavity 26 is arranged at the middle position of the fixed part 24, a top rod 27 is arranged inside the cavity 26, the upper end of the top rod 27 penetrates through the arc-shaped support part 25, the lower end of the top rod 27 is fixedly connected with a lifting plate 28 arranged inside the cavity 26, one end of the lifting plate 28 is provided with a connecting rod 29, the upper end of the connecting rod 29 is hingedly arranged with a clamping part 30, one end of the clamping part 30 penetrates through the arc-shaped support part 25 and is clamped in a clamping groove 31 arranged on the outer side wall of the vacuum container 1.

[0055] In a preferred embodiment, a sliding groove is arranged on the inner side wall of the cavity 26, a sliding block 32 is fixedly arranged on the outer side wall of the lifting plate 28, the sliding block 32 is slidingly arranged in the sliding groove, and a reset spring 33 is fixedly arranged at the bottom end of the lifting plate 28.

[0056] In a preferred embodiment, a mounting groove 34 is arranged on the side wall of the lifting plate 28, an extrusion spring 35 is fixedly arranged inside the mounting groove 34, one end of the extrusion spring 35 is fixedly connected with the connecting rod 29, a plurality of locking holes 36 are arranged on the connecting rod 29, and a locking bolt 3 is arranged at the locking hole 36.

[0057] The working principle of the present application is as follows: when the vacuum container 1 is installed, the vacuum container 1 is placed on the arc-shaped support 25, the top rod 27 is in contact with the side wall of the vacuum container 1, and the top rod 27 moves downward under the pressure of the vacuum container 1; when the top rod 27 moves downward, the lifting plate 28 drives the connecting rod 29 to move downward, the connecting rod 29 moves downward, the clamping piece 30 moves upward in an arc shape, the clamping piece 30 gradually moves to the outside of the clamping groove 31 of the vacuum container 1, when the outer wall of the vacuum container 1 is in contact with the arc-shaped support 25, the arc-shaped support 25 supports the vacuum container 1, at this time, the clamping piece 30 is completely clamped into the clamping groove 31, the clamping piece 30 can clamp and fix the vacuum container 1, prevent the vacuum container 1 from moving in the horizontal direction and the vertical direction, then the connecting rod 29 is fixed by using the locking bolt 3.

[0058] When the vacuum container 1 is disassembled, the locking bolt 3 is removed, the connecting rod 29 is lifted upward, the clamping piece 30 is withdrawn from the clamping groove 31, and then the vacuum container 1 is removed from the arc-shaped support 25.

[0059] Finally, it should be noted that: the above only describes the preferred embodiments of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A rapid deployment thermal vacuum testing device, characterized by: The invention comprises a vacuum container (1) and a vacuum pumping unit (2), wherein the vacuum container (1) is mounted on a supporting platform (6), a heat sink (4) is provided on the inner side wall of the vacuum container (1), a cold plate (10) is provided on the inner side of the heat sink (4), a container cover (5) is hingedly provided at the front end of the vacuum container (1), an electric control cabinet (7) is fixedly mounted on the supporting platform (6), and the vacuum container (1) is fixedly connected to the supporting platform (6) via a mounting assembly; The mounting assembly includes a fixing member (24) fixedly arranged on the upper end of the support platform (6), an arc-shaped support member (25) is fixedly arranged on the upper end of the fixing member (24), a cavity (26) is opened in the middle position of the fixing member (24), a push rod (27) is arranged inside the cavity (26), the upper end of the push rod (27) passes through the arc-shaped support member (25), the lower end of the push rod (27) is fixedly connected to a lifting plate (28) arranged inside the cavity (26), one end of the lifting plate (28) is provided with a connecting rod (29), the upper end of the connecting rod (29) is hingedly provided with a clamping member (30), one end of the clamping member (30) passes through the arc-shaped support member (25) and is clamped in a clamping groove (31) on the outer wall of the vacuum container (1); The side wall of the lifting plate (28) is provided with a mounting groove (34), an extrusion spring (35) is fixedly provided inside the mounting groove (34), one end of the extrusion spring (35) is fixedly connected to the connecting rod (29), and a plurality of locking holes (36) are provided on the connecting rod (29), and a locking bolt (3) is provided at each of the locking holes (36).

2. The rapid deployment thermal vacuum testing device according to claim 1, characterized in that: A door heat sink (8) is fixedly mounted on the inner side wall of the container cover (5), and a bottom heat sink is provided at the rear end of the body heat sink (4) away from the container cover (5).

3. The rapid deployment thermal vacuum testing device according to claim 1, characterized in that: A plurality of flange interfaces (9) are provided on the outer side wall of the vacuum container (1), and the plurality of flange interfaces (9) include a vacuum extraction interface, a vacuum measurement interface, a functional interface, and a testing flange interface.

4. The rapid deployment thermal vacuum testing device according to claim 2, characterized in that: The body heat sink (4) and the door heat sink (8) are fixedly arranged on the vacuum container (1) and the container cover plate (5), respectively.

5. The rapid deployment thermal vacuum testing device according to claim 3, characterized in that: A cold plate (10) is provided at the lower end of the interior of the heat sink (4), and the cold plate (10) is made of a metal material. Both ends of the cold plate (10) are provided with polytetrafluoroethylene wheels (11), and the polytetrafluoroethylene wheels (11) are slidably provided on a guide rail (12). The cold plate (10) is cooled by liquid nitrogen and a heating wire is provided inside.

6. The rapid deployment thermal vacuum testing device according to claim 1, characterized in that: The vacuum pumping unit (2) includes a molecular pump pumping system and a cryogenic pump pumping system, the molecular pump pumping system includes a rough vacuum pre-pump (13) and a molecular pump (14), the rough vacuum pre-pump (13) and the molecular pump (14) are both connected to the vacuum container (1) through a metal bellows, and a rough pumping valve (15) and a molecular pump valve (16) are respectively provided on the two metal bellows, the cryogenic pump pumping system includes a front-stage dry pump (17) and a cryogenic pump (18), the front-stage dry pump (17) and the cryogenic pump (18) are both connected to the vacuum container (1) through the metal bellows, and a vent valve (19) and a cryogenic pump main valve (20) are provided on the metal bellows, a pre-pumping valve (21) is provided between the cryogenic pump (18) and the front-stage dry pump (17), and a front-stage valve (22) is provided between the front-stage dry pump (17) and the molecular pump (14).

7. The rapid deployment thermal vacuum testing device according to claim 6, characterized in that: The invention also includes two liquid nitrogen storage tanks (23), which are connected to the cold plate (10), the body heat sink (4), the door heat sink (8) and the bottom heat sink inside the vacuum container (1) through a low-temperature hose. A control valve system is provided on the low-temperature hose. The electric control cabinet (7) is provided with a temperature control display intelligent instrument, a vacuum measurement display instrument, a vacuum system control power supply, a switch status display light and a fault alarm warning light. The PID temperature control mode inside the vacuum container (1) is electrically connected to the electric control cabinet (7), and the electric control cabinet (7) is electrically connected to the vacuum pumping unit (2) and the control valve system on the low-temperature hose.

8. The rapid deployment thermal vacuum testing device according to claim 1, characterized in that: A sliding groove is provided on the inner side wall of the cavity (26), a sliding block (32) is fixedly provided on the outer side wall of the lifting plate (28), the sliding block (32) is slidably provided in the sliding groove, and a return spring (33) is fixedly provided at the bottom end of the lifting plate (28).

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