Low-frequency electromagnetic shielding device

Abstract

The utility model discloses a low-frequency electromagnetic shielding device, and belongs to the technical field of electromagnetic shielding. The device comprises a shielding box, the shielding box is provided with a temperature adjusting mechanism used for adjusting the internal temperature of the shielding box, the shielding box is internally provided with a detection mounting assembly, the detection mounting assembly comprises a mounting base and a signal receiving socket which are arranged at the inner bottom of the shielding box, the mounting base is provided with a plurality of groups of mounting sockets, and the signal receiving socket is connected with the signal receiving socket. Wherein an electromagnetic wave signal interference simulation device is mounted on one group of mounting sockets, and an opening is formed in the shielding box. When the shielding box is used, electromagnetic waves generated by the outside are isolated under the action of the metal isolation box and the metal plate, so that a closed environment capable of shielding external electromagnetic interference is created in the shielding box. Through the electromagnetic wave signal interference simulation device, electromagnetic wave interference signals in different environments and different degrees in life can be simulated, and the use conditions of the detection circuit module in various environments can be determined.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic shielding technology, and in particular to a low-frequency electromagnetic shielding device. Background Technology

[0002] Electromagnetic shielding refers to a measure that uses shells, plates, sleeves, etc., made of conductive or magnetic materials to confine electromagnetic energy within a certain space, thereby preventing its propagation or reducing its impact on the outside world. It is mainly used to protect electronic equipment from interference from external electromagnetic fields, or to prevent the electromagnetic fields generated by electronic equipment from causing adverse effects on the outside world.

[0003] In laboratory environments, electromagnetic shielding boxes are indispensable testing equipment when testing critical electronic components such as 5G communication circuit modules, high-precision current transformers, communication circuit modules for mobile phones and tablets, and wireless receiver modules for walkie-talkies. These components need to be placed in a closed environment that shields them from external electromagnetic interference during testing to ensure the accuracy and reliability of the test results. Electromagnetic shielding boxes provide such an interference-free testing space, enabling researchers to accurately evaluate the performance of these components.

[0004] The shortcomings of the existing technical solutions are as follows: While electromagnetic shielding boxes can simulate an interference-free working environment for testing the performance of electromagnetic signal output or receiving devices, this is far from sufficient for devices used in extreme environments (such as high-temperature radar flowmeter signal processing circuit modules and wide-temperature-range microwave modulator signal processing circuit modules on spacecraft). These limited testing conditions cannot fully meet the needs for further optimization and performance improvement of the equipment. Utility Model Content

[0005] This invention provides a low-frequency electromagnetic shielding device that can solve the problem in the existing electromagnetic shielding boxes that cannot create a controllable and relatively extreme test environment according to optimization needs.

[0006] A low-frequency electromagnetic shielding device includes a shielding box, a temperature regulating mechanism for adjusting the internal temperature of the shielding box, a detection and installation assembly inside the shielding box, the detection and installation assembly including a mounting base and a signal receiving socket located at the bottom of the shielding box, multiple sets of mounting sockets on the mounting base, one set of which is equipped with an electromagnetic wave signal interference simulation device, and an opening on the shielding box, with a cover plate for blocking the opening.

[0007] As a further embodiment of this utility model: the shielding box includes an outer shell, a metal isolation box is fixedly disposed inside the outer shell, a detection chamber is disposed inside the metal isolation box, and the temperature control mechanism is disposed between the metal isolation box and the outer shell.

[0008] As a further embodiment of this utility model: the temperature regulating mechanism includes a heat-conducting pipe surrounding the side of the isolation box, the space between the heat-conducting pipe and the metal isolation box is filled with a heat-conducting medium, one end of the heat-conducting pipe is connected to a heat-transmitting pipe for conveying a heat source, the other end of the heat-transmitting pipe is connected to a heat source generating device, and the other end of the heat-conducting pipe is connected to an output pipe.

[0009] As a further embodiment of this utility model: a conductive cavity is provided at the bottom of the outer shell, and a conductive component for supplying power to the mounting base and signal receiving socket is provided inside the conductive cavity, and a base plate is detachably connected to the opening of the conductive cavity.

[0010] As a further embodiment of this utility model: the conductive component includes a first clamping member and a second clamping member fixedly disposed inside the conductive cavity. Each set of the first clamping member and the second clamping member is fixedly disposed with a set of wires. Multiple sets of wiring sockets are provided on one side of the housing. Each set of wiring sockets is electrically connected to the corresponding wires. The other end of each set of wires is disposed through the bottom of the metal isolation box. The mounting socket and the signal receiving socket are both electrically connected to the corresponding wires.

[0011] As a further embodiment of this utility model, the metal isolation box is electrically connected to a grounding wire.

[0012] As a further embodiment of this utility model, a heat insulation layer is provided between the outer shell and the heat-conducting pipe.

[0013] As a further embodiment of this utility model: the cover plate includes a top shell, and an insulation board and a metal plate are fixedly disposed at the bottom of the top shell. The insulation board is located between the metal plate and the top shell, and the edge of the metal plate cooperates with the metal isolation box.

[0014] As a further embodiment of this utility model: the inner wall of the metal isolation box is provided with a first wave-absorbing layer, and the bottom of the metal plate is fixedly provided with a second wave-absorbing layer.

[0015] As a further embodiment of this utility model: a lifting device for driving the cover plate to move up and down is connected above the top shell.

[0016] The beneficial effects of this utility model are:

[0017] 1. In use, this utility model isolates external electromagnetic waves through the metal isolation box and metal plate, creating a closed environment inside the shielding box that can shield against external electromagnetic interference. The electromagnetic interference simulation device can simulate electromagnetic interference signals of different levels and environments in daily life, determining the performance of the detection circuit module under various conditions.

[0018] 2. When this utility model is in use, the heat source generating device will deliver a heat source into the heat delivery pipe, and then deliver the heat source into the heat conduction pipe. The heat conduction pipe will then provide heat to the metal isolation box, raising the temperature sequentially to 40℃, 50℃, 60℃, 70℃, etc. Each temperature point will be operated continuously for a period of time to ensure that the device is fully heated and reaches a stable state. Afterwards, the electromagnetic wave transmission and reception at each temperature range will be detected to determine the usage of the electromagnetic wave generating circuit module at different temperatures. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of a low-frequency electromagnetic shielding device provided by this utility model;

[0020] Figure 2 A schematic diagram of the overall longitudinal section structure of a low-frequency electromagnetic shielding device provided by this utility model;

[0021] Figure 3 A top view of the detection and installation assembly of a low-frequency electromagnetic shielding device provided by this utility model;

[0022] Figure 4 A schematic diagram of the conductive component structure of a low-frequency electromagnetic shielding device provided by this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Shielding box; 101. Outer shell; 102. Detection chamber; 103. First absorbing layer; 104. Metal isolation box; 105. Heat-conducting medium; 106. Insulation layer; 107. Conductive cavity; 108. Base plate; 2. Temperature control mechanism; 201. Heat supply pipe; 202. Heat conduction pipe; 203. Output pipe; 3. Cover plate; 301. Top shell; 302. Insulation board; 303. Metal plate; 304. Second absorbing layer; 4. Lifting device; 5. Detection and installation components; 501. Mounting base; 502. Mounting socket; 503. Electromagnetic wave signal interference simulation device; 504. Signal receiving socket; 6. Conductive components; 601. First clamping component; 602. Second clamping component; 603. Wiring socket; 604. Wire; 7. Grounding wire. Detailed Implementation

[0025] The specific embodiments of this utility model are described in detail below, but it should be understood that the protection scope of this utility model is not limited to the specific embodiments.

[0026] like Figures 1 to 4 As shown in the figure, this utility model provides a low-frequency electromagnetic shielding device, including a shielding box 1. The shielding box 1 includes a shell 101, and a metal isolation box 104 is fixedly disposed inside the shell 101. A detection cavity 102 is disposed inside the metal isolation box 104 to prevent external electromagnetic interference. A first absorbing layer 103 is disposed on the inner wall of the metal isolation box 104 to absorb electromagnetic waves, such as... Figure 2 As shown, the shielding box 1 has an opening, and a cover plate 3 is provided at the opening to block it. The metal isolation box 104 is electrically connected to a grounding wire 7. When electromagnetic interference is generated inside the electromagnetic shielding box 1, the grounding wire 7 can guide the interference current to the ground, thereby preventing the interference current from affecting the electromagnetic wave generating circuit module under test.

[0027] The shielding box 1 is equipped with a temperature regulating mechanism 2 for adjusting the internal temperature of the shielding box 1. The temperature regulating mechanism 2 is located between the metal isolation box 104 and the outer shell 101. Figure 2 As shown, the temperature control mechanism 2 includes a heat-conducting pipe 202 surrounding the side of the isolation box. A heat-conducting medium 105 is filled between the heat-conducting pipe 202 and the metal isolation box 104. The heat-conducting medium 105 can be made of thermally conductive silicone grease, which is lightweight, corrosion-resistant, and has good thermal conductivity. Other materials with the same function are also within the scope of this solution. One end of the heat-conducting pipe 202 is connected to a heat-transmitting pipe 201, and the other end of the heat-transmitting pipe 201 is connected to a heat-generating device. The heat-generating device can be a steam generator or a hot water reheating device for circulating hot water, used to heat the heat-conducting pipe 202, thereby transferring heat to the interior of the metal isolation box 104 through the heat-conducting medium 105, changing its detection environment. Other devices with the same function are also within the scope of this solution. The other end of the heat pipe 202 is connected to an output pipe 203. During use, the heat source is transferred from the heat supply pipe 201 to the interior of the heat pipe 202, achieving a heating effect on the metal isolation box 104. The heat source is output from the output pipe 203, achieving a circulating heating effect, sequentially raising the temperature to 40℃, 50℃, 60℃, 70℃, etc. Each temperature point is operated continuously for a period of time to ensure the device is fully heated and reaches a stable state. Then, the electromagnetic wave transmission and reception at each temperature range are detected to determine the performance of the electromagnetic wave generating circuit module at different temperatures. A heat insulation layer 106 is provided between the outer shell 101 and the heat pipe 202 to reduce the impact of the heat pipe 202 on the external environment and prevent burns to the operator.

[0028] The shielded enclosure 1 contains a testing and installation assembly 5. The assembly includes a mounting base 501 and a signal receiving socket 504 located at the bottom of the enclosure 1. Both the mounting base 501 and the signal receiving socket 504 have plastic-ceramic shells, ensuring they will not deform at high temperatures, thus maintaining testing effectiveness. The mounting base 501 has multiple sets of mounting sockets 502, facilitating simultaneous testing of multiple electromagnetic wave generating circuit modules. Figure 3 As shown, one set of mounting sockets 502 is equipped with an electromagnetic wave signal interference simulation device 503. The electromagnetic wave signal interference simulation device 503 is used to simulate electromagnetic wave interference signals of different environments and degrees in daily life, and to determine the usage of the electromagnetic wave generating circuit module in various environments. The electromagnetic wave signal interference simulation device 503 can be an electromagnetic interference simulator (such as the Wobbe HPSG-600 portable electromagnetic interference radiation source) or a jammer (such as the FX10 jamming unit).

[0029] A conductive cavity 107 is provided at the bottom of the outer casing 101, and a base plate 108 is detachably connected to the opening of the conductive cavity 107. Figure 2 As shown, a conductive assembly 6 for supplying power to the mounting base 501 and the signal receiving socket 504 is provided inside the conductive cavity 107. The conductive assembly 6 includes a first clamping member 601 and a second clamping member 602 fixedly disposed inside the conductive cavity 107. Each set of the first clamping member 601 and the second clamping member 602 has a set of wires 604 fixedly disposed on it. That is, the first clamping member 601 and the second clamping member 602 are used to fix the corresponding wires 604, allowing the wires 604 to pass through the metal isolation box 104 and connect to the corresponding detection component. Multiple sets of wiring sockets 603 are provided on one side of the outer casing 101. Each set of wiring sockets 603 is electrically connected to the corresponding wires 604, specifically as follows... Figure 4 As shown, both the mounting socket 502 and the signal receiving socket 504 are electrically connected to the corresponding wires 604.

[0030] The cover plate 3 includes a top shell 301. A lifting device 4 is connected above the top shell 301 to drive the cover plate 3 up and down, ensuring that there are no gaps at the edges after the cover plate 3 is fastened to the shielding box 1. An insulation plate 302 and a metal plate 303 are fixedly installed at the bottom of the top shell 301. The insulation plate 302 is located between the metal plate 303 and the top shell 301. The edge of the metal plate 303 cooperates with the metal isolation box 104. A second wave-absorbing layer 304 is fixedly installed at the bottom of the metal plate 303. The first wave-absorbing layer 103 and the second wave-absorbing layer 304 can be a conical wave absorber, wave-absorbing cotton, or other materials that can absorb electromagnetic waves, all of which fall within the protection scope of this patent.

[0031] Working Principle: During use, the lifting device 4 controls the cover plate 3 to move upward, causing the cover plate 3 to detach from the shielding box 1, exposing the detection and installation assembly 5 inside the shielding box 1. The electromagnetic wave generating circuit module to be tested is installed in the mounting socket 502, ensuring that the circuit input terminal is electrically connected to the mounting socket 502. Then, the electromagnetic wave receiving circuit module is installed on the signal receiving socket 504. During testing, the electromagnetic wave receiving circuit module receives the signal emitted by the electromagnetic wave generating circuit module. The electromagnetic wave signal interference simulation device 503 is activated, which then drives the cover plate 3 to close the shielding box 1, ensuring full contact between the metal isolation box 104 and the metal plate 303. External electromagnetic waves are isolated by the action of the metal isolation box 104 and the metal plate 303, thus creating a closed environment inside the shielding box 1 that can shield against external electromagnetic interference. An electrical signal is sent to the wire 604 electrically connected to the electromagnetic wave signal interference simulation device 503, allowing the electromagnetic wave signal interference simulation device 503 to simulate electromagnetic wave interference signals of different environments and degrees in daily life, determining the performance of the detection circuit module in various environments.

[0032] In use, the heat source generating device delivers heat to the inside of the heat supply pipe 201, which then delivers the heat to the inside of the heat conduction pipe 202. The heat conduction pipe 202 provides heat to the metal isolation box 104, raising the temperature sequentially to 40℃, 50℃, 60℃, 70℃, etc. Each temperature point is operated continuously for a period of time to ensure that the device is fully heated and reaches a stable state. Then, the electromagnetic wave transmission and reception at each temperature range are detected to determine the usage of the electromagnetic wave generating circuit module at different temperatures.

[0033] The above-disclosed embodiments are only a few specific examples of the present utility model. However, the embodiments of the present utility model are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present utility model.

Claims

1. A low-frequency electromagnetic shielding device, comprising a shielding box (1), characterized in that, The shielding box (1) is provided with a temperature regulating mechanism (2) for adjusting the internal temperature of the shielding box (1). The shielding box (1) is provided with a detection installation assembly (5). The detection installation assembly (5) includes a mounting base (501) and a signal receiving socket (504) located at the bottom of the shielding box (1). The mounting base (501) is provided with multiple sets of mounting sockets (502). One set of mounting sockets (502) is equipped with an electromagnetic wave signal interference simulation device (503). The shielding box (1) has an opening, and a cover plate (3) is provided at the opening for blocking the opening.

2. The low-frequency electromagnetic shielding device as described in claim 1, characterized in that, The shielding box (1) includes an outer shell (101), a metal isolation box (104) is fixedly installed inside the outer shell (101), a detection chamber (102) is installed inside the metal isolation box (104), and the temperature control mechanism (2) is installed between the metal isolation box (104) and the outer shell (101).

3. A low-frequency electromagnetic shielding device as described in claim 2, characterized in that, The temperature control mechanism (2) includes a heat-conducting pipe (202) surrounding the side of the isolation box. A heat-conducting medium (105) is filled between the heat-conducting pipe (202) and the metal isolation box (104). One end of the heat-conducting pipe (202) is connected to a heat-transmitting pipe (201) for conveying a heat source. The other end of the heat-transmitting pipe (201) is connected to a heat source generating device. The other end of the heat-conducting pipe (202) is connected to an output pipe (203).

4. A low-frequency electromagnetic shielding device as described in claim 2 or 3, characterized in that, The bottom of the outer shell (101) is provided with a conductive cavity (107), and the conductive cavity (107) is provided with a conductive component (6) for supplying power to the mounting base (501) and the signal receiving socket (504). A base plate (108) is detachably connected to the opening of the conductive cavity (107).

5. A low-frequency electromagnetic shielding device as described in claim 4, characterized in that, The conductive component (6) includes a first clamping member (601) and a second clamping member (602) fixedly disposed inside the conductive cavity (107). Each set of the first clamping member (601) and the second clamping member (602) is fixedly disposed with a set of wires (604). Multiple sets of wiring sockets (603) are provided on one side of the outer shell (101). Each set of wiring sockets (603) is electrically connected to the corresponding wires (604). The other end of each set of wires (604) is disposed through the bottom of the metal isolation box (104). The mounting socket (502) and the signal receiving socket (504) are both electrically connected to the corresponding wires (604).

6. A low-frequency electromagnetic shielding device as described in claim 4, characterized in that, The metal isolation box (104) is electrically connected to a grounding wire (7).

7. A low-frequency electromagnetic shielding device as described in claim 3, characterized in that, A heat insulation layer (106) is provided between the outer shell (101) and the heat pipe (202).

8. A low-frequency electromagnetic shielding device as described in claim 2, characterized in that, The cover plate (3) includes a top shell (301), and a heat insulation plate (302) and a metal plate (303) are fixedly installed at the bottom of the top shell (301). The heat insulation plate (302) is located between the metal plate (303) and the top shell (301), and the edge of the metal plate (303) is matched with the metal isolation box (104).

9. A low-frequency electromagnetic shielding device as described in claim 8, characterized in that, The inner wall of the metal isolation box (104) is provided with a first wave-absorbing layer (103), and the bottom of the metal plate (303) is fixedly provided with a second wave-absorbing layer (304).

10. A low-frequency electromagnetic shielding device as described in claim 8, characterized in that, A lifting device (4) for driving the cover plate (3) to move up and down is connected above the top shell (301).

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