Shielding device

Abstract

The present invention provides a shielding device, including a bracket, a shielding cover movably arranged on the bracket, a shielding screen fixed on the bracket, an absorbing module and a test frame, the shielding cover is a hollow structure and has an opening connected to the outside, the shielding screen and the opening are adapted to close the shielding cover through the opening, the shielding cover is on the bracket to be able to move towards or away from the shielding screen, the absorbing module is respectively arranged on the inner wall of the shielding cover and the inner wall of the shielding screen, and the test frame is arranged on the inner wall of the shielding screen. Among them, the test frame is used to place the test piece, and the shielding cover is moved so that the shielding cover and the shielding screen cooperate to form a closed space that can accommodate the test piece, and the absorbing module is respectively arranged on the inner wall of the shielding cover and the shielding screen, so that the absorbing module can surround the test piece in multiple directions to better absorb the electromagnetic waves generated when the test piece is subjected to a thermal vacuum test, thereby avoiding microwave damage to the test personnel or interference with other test equipment caused by the electromagnetic waves.

Description

Technical Field

[0001] The present invention belongs to the technical field of electromagnetic shielding, and more specifically, relates to a shielding device. Background Art

[0002] Thermal vacuum test refers to a test to verify the various performance and functions of a spacecraft and its components under vacuum and certain temperature conditions. In order to obtain accurate thermal vacuum test data, during the simulation test, most of the spacecraft specimens are in normal working conditions.

[0003] However, when some spacecraft components are tested (such as active antennas), electromagnetic radiation will occur when they are in normal working condition. The electromagnetic waves generated will not only cause microwave damage to testers, but also interfere with other test equipment, affecting the normal progress of the test. Summary of the invention

[0004] The purpose of the present invention is to provide a shielding device, which is intended to solve the problem that when some components of a spacecraft are subjected to thermal vacuum tests, electromagnetic radiation may occur, causing microwave damage to test personnel and interfering with other test equipment.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: to provide a shielding device, including a bracket, a shielding cover movably arranged on the bracket, a shielding screen fixed on the bracket, an absorbing module and a test frame, the shielding cover is a hollow structure and has an opening connected to the outside, the shielding screen is adapted to the opening and is used to close the shielding cover through the opening, the shielding cover is used on the bracket to approach or move away from the shielding screen, the absorbing modules are respectively arranged on the inner wall of the shielding cover and the inner wall of the shielding screen, and the test frame is arranged on the inner wall of the shielding screen.

[0006] In one embodiment, the bracket includes a linear track and a fixing frame arranged adjacent to the linear track, the shielding cover is used to reciprocate along the extension direction of the linear track, and the shielding screen is fixed to the fixing frame and is located on the movement track of the shielding cover.

[0007] In one embodiment, the linear track includes two guide rails arranged at intervals and a connecting rod for fixing the two guide rails, and the bottom surface of the shielding cover is movably connected to the two guide rails; the shielding device also includes a driving motor and a rack meshingly connected to the rotor of the driving motor, the driving motor is fixed to the guide rails, and the rack is arranged on the bottom surface of the shielding cover and parallel to the guide rails.

[0008] In one embodiment, the inner wall and the outer wall opposite to the inner wall of the shielding screen are respectively provided with a first connection port and a second connection port, and the first connection port is electrically connected to the second connection port.

[0009] In one embodiment, the shielding cover includes a frame having an opening on one side, a shielding layer disposed on the inner side of the frame and cooperating with the opening to form a semi-enclosed cavity, and a decorative layer disposed on the outer side of the frame.

[0010] In one embodiment, the frame is provided with a first sealing ring body and a second sealing ring body which are layered and enclosed around the outer periphery of the opening, the first sealing ring body and the second sealing ring body both extend in a direction toward the shielding screen, and elastic members are respectively provided on a side of the first sealing ring body facing the second sealing ring body and a side of the second sealing ring body facing the first sealing ring body, the shielding screen is provided with a third sealing ring body corresponding to the first sealing ring body, and a fourth sealing ring body corresponding to the second sealing ring body, and the third sealing ring body and the fourth sealing ring body both extend in a direction toward the frame;

[0011] When the shielding screen closes the opening, the third sealing ring body and the fourth sealing ring body extend into the gap formed by the first sealing ring body and the second sealing ring body, and elastically abut against the first sealing ring body and the second sealing ring respectively through the elastic member.

[0012] In one embodiment, the absorbing module includes a mounting plate and an array of absorbing cones arranged on the mounting plate, and the mounting plate is arranged on the inner wall of the shielding layer and the inner wall of the shielding screen.

[0013] In one embodiment, the wave absorbing cone includes a cone portion and a fixing portion arranged at the bottom end of the cone portion, and the mounting plate is provided with a plurality of fixing grooves arranged at intervals for plugging and cooperating with the fixing portion.

[0014] In one embodiment, the wave absorbing module further includes a silicone rubber layer disposed between the fixing portion and the fixing groove.

[0015] In one embodiment, the absorbing module further includes a first snap-in ear and a second snap-in ear snap-fitted to the first snap-in ear, one snap-in ear is arranged on the side of the mounting plate facing away from the absorbing cone, and the second snap-in ear is respectively arranged on the inner wall of the shielding screen and the inner wall of the shielding layer.

[0016] The beneficial effect of the shielding device provided by the present invention is that: in the above-mentioned shielding device, the test frame for fixing the test piece is arranged on the inner wall of the shielding screen, and the shielding cover is moved so that the shielding cover and the shielding screen cooperate to form a closed space that can accommodate the test piece, and the absorbing module is respectively arranged on the inner wall of the shielding cover and the shielding screen, so that the absorbing module can surround the test piece in multiple directions to better absorb the electromagnetic waves generated when the test piece is subjected to a thermal vacuum test, thereby avoiding microwave damage to the test personnel or interference with other test equipment caused by the electromagnetic waves. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A perspective schematic diagram of a shielding device provided by an embodiment of the present invention when it is opened;

[0019] Figure 2 for Figure 1 A perspective schematic diagram of the shielding device when it is closed;

[0020] Figure 3 for Figure 1 A schematic diagram of the connection structure between the shielding cover and the linear track in the shielding device shown;

[0021] Figure 4 for Figure 1 A schematic diagram of the assembly structure of the shielding cover and the absorbing module in the shielding device shown;

[0022] Figure 5 for Figure 1 A schematic diagram of the structure of a shielding cover in the shielding device shown;

[0023] Figure 6 for Figure 1 A schematic structural diagram of the shielding device when the first sealing ring body and the second sealing ring body are elastically abutted against the third sealing ring body and the fourth sealing ring body respectively;

[0024] Figure 7 for Figure 4 A partial enlarged schematic diagram of point a in the middle;

[0025] Figure 8 for Figure 4 A partial enlarged schematic diagram of point b in the middle.

[0026] In the figure: 10, shielding device; 100, bracket; 110, linear track; 111, guide rail; 112, connecting rod; 120, fixing frame; 200, shielding cover; 205, opening; 210, frame; 211, first sealing ring body; 212, second sealing ring body; 213, elastic member; 220, shielding layer; 230, decorative layer; 300, shielding screen; 301, third sealing ring body; 302, fourth sealing ring body; 400, absorbing module; 410, mounting plate; 415, fixing groove; 420, absorbing cone; 421, cone part; 422, fixing part; 430, first connecting ear; 440, second connecting ear; 500, test frame; 600, drive motor; 700, rack. DETAILED DESCRIPTION

[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0029] It should be understood that the orientation or positional relationship indicated by the terms "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention 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 therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0031] See also Figure 1 and Figure 2 Now, a shielding device 10 provided in an embodiment of the present invention is described. The shielding device 10 includes a bracket 100, a shielding cover 200, a shielding screen 300, and an absorbing module 400 (for easy observation, Figure 1 and Figure 2 Only a part of the absorbing module 400 and the test frame 500 are shown in the figure, wherein the shielding cover 200 is a hollow structure and has an opening 205 connected to the outside, the shielding screen 300 is adapted to the shape (structure) of the opening 205, and is used to shield the opening 205 so as to close the shielding cover 200 to form a closed space, and the shielding screen 300 is fixed on the bracket 100, the shielding cover 200 is movably arranged on the bracket 100 and the side with the opening 205 is arranged opposite to the shielding screen 300, so that the shielding cover 200 is used to approach or move away from the shielding screen 300 on the bracket 100, so as to shield or open the opening 205 of the shielding cover 200 through the shielding screen 300, and in addition, the absorbing module 400 is respectively arranged on the inner walls of the shielding cover 200 and the shielding screen 300, and the test frame 500 is arranged on the inner wall of the shielding screen 300.

[0032] The shielding device 10 provided by the present invention has the beneficial effect that: when conducting a thermal vacuum test, the test piece can be placed on the test frame 500, and the shielding cover 200 can be moved in the direction toward the shielding screen 300, so that the shielding cover 200 and the shielding screen 300 can form a closed space, and the test piece can be accommodated in the closed space. Moreover, since the absorbing module 400 is respectively arranged on the inner wall of the shielding cover 200 and the shielding screen 300, it can surround the test piece in multiple directions, thereby improving the absorption effect of the electromagnetic waves generated by the test piece, and avoiding the phenomenon that the electromagnetic waves of the test piece cause microwave harm to the test personnel or interfere with other test equipment.

[0033] Furthermore, in this embodiment, the above-mentioned bracket 100 includes a linear rail 110 and a fixed frame 120, wherein the linear rail 110 is arranged adjacent to the fixed frame 120, the shielding cover 200 is movably arranged on the linear rail 110 to reciprocate along the extension direction of the linear rail 110, and the shielding screen 300 is arranged on the fixed frame 120 and is located on the movement trajectory of the shielding cover 200 on the linear rail 110.

[0034] Specifically, in this embodiment, Figure 1 Taking the perspective as an example, the fixing frame 120 is arranged at the end of the linear track 110 along the extension direction of the linear track 110 , and the shielding screen 300 is fixed on the fixing frame 120 in the vertical direction and suspended above one end of the linear track 110 to face the opening 205 of the shielding cover 200 .

[0035] See also Figure 3 ( Figure 3 (a bottom view), in this embodiment, the linear track 110 includes two guide rails 111 that are spaced apart and arranged in parallel, and a plurality of connecting rods 112 that connect and fix the guide rails 111, and the bottom surface of the shielding cover 200 is movably connected to the two guide rails 111; the shielding device 10 also includes a driving motor 600 and a rack 700, wherein the driving motor 600 is fixed to the guide rails 111, and the rotor (not shown) of the driving motor 600 is meshed and connected with the rack 700, and the rack 700 is arranged on the bottom surface of the shielding cover 200 and parallel to the guide rails 111, so that the shielding cover 200 can be driven by the driving motor 600 to perform linear reciprocating motion on the two guide rails 111. Specifically, the driving motor 600 is fixed between the two guide rails 111.

[0036] See also Figure 5 In this embodiment, the shielding cover 200 includes a frame 210 having an opening 205 on one side, a shielding layer 220 and a decorative layer 230, wherein the shielding layer 220 is arranged on the inner side of the frame 210 and cooperates with the opening 205 to form a semi-closed cavity structure, and the decorative layer 230 is arranged on the outer side of the frame 210 to cover the outer surface of the frame 210.

[0037] Specifically, in this embodiment, the frame 210 is a rectangular structure composed of keels, the opening 205 is also a rectangle, the shielding layer 220 is an aluminum plate respectively arranged on the inner side of the frame 210, and the decorative layer 230 is a patterned aluminum plate respectively arranged on the outer side of the frame 210. In some other embodiments, in order to adapt to the shape and size of the test piece, the shape and size of the frame 210 and / or the opening 205 can be adaptively adjusted, and the shielding screen 300 can be kept adapted to the opening 205. For example, in some specific embodiments, the frame 210 can be a cylindrical structure composed of keels.

[0038] Please participate Figure 1 , Figure 2 and Figure 6 In this embodiment, the frame 210 has a first sealing ring body 211 and a second sealing ring body 212 which surround the outer periphery of the opening 205 layer by layer, that is, the first sealing ring body 211 surrounds the outer periphery of the opening 205, and the second sealing ring body 212 is spaced and surrounded by the outer periphery of the first sealing ring body 211, and the first sealing ring body 211 and the second sealing ring body 212 both extend in a direction toward the shielding screen 300, and the first sealing ring body 211 is disposed on one side of the second sealing ring body 212, and the second sealing ring body 212 is disposed on one side of the first sealing ring body 211; the shielding screen 300 is provided with an elastic member 213; The third sealing ring body 301 corresponding to the first sealing ring body 211, and the fourth sealing ring body 302 corresponding to the second sealing ring body 212, the third sealing ring body 301 and the fourth sealing ring body 302 both extend in the direction toward the frame 210; when the shielding screen 300 covers the opening 205, the third sealing ring body 301 and the fourth sealing ring body 302 both extend into the gap formed between the first sealing ring body 211 and the second sealing ring body 212, and elastically abut against the first sealing ring body 211 and the second sealing ring body 212 respectively through the elastic member 213, so that the shielding cover 200 and the shielding screen 300 are tightly fixed.

[0039] Furthermore, in some other embodiments, a first locking piece (not shown in the figure) and a second locking piece (not shown in the figure) adapted to be locked and fixed with the first locking piece may be respectively provided on the decorative layer 230 and the shielding screen 300, so that when the shielding screen 300 covers the opening 205, the shielding cover 200 and the shielding screen 300 are fixed by the cooperation of the first locking piece and the second locking piece.

[0040] Furthermore, in this embodiment, the shielding cover 200 further includes a waveguide (not shown), which sequentially penetrates the decorative layer 230, the frame 210 and the shielding layer 220, so that the inside of the shielding cover 200 is connected to the outside through the waveguide.

[0041] Furthermore, in the present embodiment, the inner wall of the shielding screen 300 and the outer wall opposite to the inner wall are respectively provided with a first connection port (not shown in the figure) and a second connection port (not shown in the figure), and the first connection port and the second connection port are electrically connected. Thus, when the shielding screen 300 covers the opening 205, the test piece located in the shielding device 10 can be electrically connected to the external circuit structure or other equipment through the first connection port and the second connection port.

[0042] See also Figure 4 and Figure 7 (For ease of observation, Figure 4 In the perspective view, the absorbing module 400 disposed in the direction of the opening 205 has been omitted). In this embodiment, the absorbing module 400 includes a mounting plate 410 and an absorbing cone 420 arrayed on the mounting plate 410. The mounting plate 410 is fixed on the inner wall of the shielding layer 220 and the inner wall of the shielding screen 300. Specifically, the absorbing cone 420 is made of a high temperature resistant and low outgassing silicon carbide absorbing material through sintering.

[0043] See also Figure 8 In this embodiment, the mounting plate 410 is provided with a plurality of fixed grooves 415 arranged at intervals for fixing the wave absorbing cones 420. The wave absorbing cones 420 include a cone portion 421 and a fixing portion 422 disposed at the bottom end of the cone portion 421. The fixing portion 422 is inserted and fixed in the fixing groove 415. Specifically, the fixing portion 422 is clearance-matched with the fixing groove 415, and a plurality of the wave absorbing cones 420 are fixed in one row of the fixing grooves 415.

[0044] Furthermore, the wave absorbing module 400 further includes a silicone rubber (not shown) disposed between the fixing portion 422 and the fixing groove 415 , so as to enhance the fixing strength and thermal conductivity between the fixing portion 422 and the fixing groove 415 .

[0045] See also Figure 7 In this embodiment, the wave absorbing module 400 further includes a first snap-in ear 430 and a second snap-in ear 440 adapted to snap-in and fix with the first snap-in ear 430. The first snap-in ear 430 is arranged on the side of the mounting plate 410 facing away from the wave absorbing cone 420, and the second snap-in ear 440 is arranged on the inner wall of the shielding screen 300 and the inner wall of the shielding layer 220. The number of the first snap-in ear 430 and the second snap-in ear 440 can be flexibly arranged and correspond to each other according to the size of the mounting plate 410. During the long-term use of the shielding device 10, if the wave absorbing cone 420 is broken, the fixing of the first snap-in ear 430 and the second snap-in ear 440 can be released, and the mounting plate 410 and the wave absorbing cone 420 on the mounting plate 410 can be replaced.

[0046] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A shielding device, characterized in that: It comprises a bracket, a shielding cover movably arranged on the bracket, a shielding screen fixed on the bracket, an absorbing module and a test stand, wherein the shielding cover is a hollow structure and has an opening communicating with the outside, the shielding screen is adapted to the opening and is used to close the shielding cover through the opening, the shielding cover is used on the bracket to approach or move away from the shielding screen, the absorbing modules are respectively arranged on the inner wall of the shielding cover and the inner wall of the shielding screen, and the test stand is arranged on the inner wall of the shielding screen; The bracket includes a linear track and a fixing frame arranged adjacent to the linear track, the shielding cover is used to reciprocate along the extension direction of the linear track, and the shielding screen is fixed to the fixing frame and is located on the movement track of the shielding cover; The linear track includes two guide rails arranged at intervals and a connecting rod for fixing the two guide rails, and the bottom surface of the shielding cover is movably connected to the two guide rails; the shielding device also includes a driving motor and a rack meshingly connected to the rotor of the driving motor, the driving motor is fixed to the guide rails, and the rack is arranged on the bottom surface of the shielding cover and parallel to the guide rails.

2. The shielding device according to claim 1, characterized in that The inner wall of the shielding screen and the outer wall opposite to the inner wall are respectively provided with a first connection port and a second connection port, and the first connection port is electrically connected to the second connection port.

3. The shielding device according to claim 1, characterized in that: The shielding cover comprises a frame having the opening on one side, a shielding layer arranged on the inner side of the frame and cooperating with the opening to form a semi-enclosed cavity, and a decorative layer arranged on the outer side of the frame.

4. The shielding device according to claim 3, characterized in that: The frame is provided with a first sealing ring body and a second sealing ring body which are enclosed layer by layer on the outer periphery of the opening, the first sealing ring body and the second sealing ring body both extend in a direction toward the shielding screen, and elastic members are respectively provided on a side of the first sealing ring body facing the second sealing ring body and a side of the second sealing ring body facing the first sealing ring body, the shielding screen is provided with a third sealing ring body corresponding to the first sealing ring body, and a fourth sealing ring body corresponding to the second sealing ring body, and the third sealing ring body and the fourth sealing ring body both extend in a direction toward the frame; When the shielding screen closes the opening, the third sealing ring body and the fourth sealing ring body extend into the gap formed by the first sealing ring body and the second sealing ring body, and elastically abut against the first sealing ring body and the second sealing ring respectively through the elastic member.

5. The shielding device according to claim 3, characterized in that: The wave absorbing module comprises a mounting plate and wave absorbing cones arranged in an array on the mounting plate. The mounting plate is arranged on the inner wall of the shielding layer and the inner wall of the shielding screen.

6. The shielding device according to claim 5, characterized in that The wave absorbing cone comprises a cone portion and a fixing portion arranged at the bottom end of the cone portion, and the mounting plate is provided with a plurality of fixing grooves arranged at intervals and used for plugging and matching with the fixing portion.

7. The shielding device according to claim 6, characterized in that The wave absorbing module further includes a silicone rubber layer arranged between the fixing portion and the fixing groove.

8. The shielding device according to claim 5, characterized in that: The wave absorbing module also includes a first snap-in ear and a second snap-in ear snap-fitted and fixed to the first snap-in ear, wherein the first snap-in ear is arranged on a side of the mounting plate facing away from the wave absorbing cone, and the second snap-in ear is respectively arranged on the inner wall of the shielding screen and the inner wall of the shielding layer.

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