Electromagnetic shielding box in electromagnetic compatibility field

Abstract

The utility model discloses an electromagnetic shielding box in the field of electromagnetic compatibility, which belongs to the technical field of electromagnetic compatibility and comprises an electromagnetic sealing groove, a lead, a wiring shielding box, a shielding box bottom plate, conductive foam and a shielding box body, the bottom of the electromagnetic sealing groove is connected with the shielding box bottom plate, and the conductive foam is mounted in the electromagnetic sealing groove. The wiring shielding box is installed on the bottom surface of the shielding box bottom plate, a plurality of wires are arranged in the wiring shielding box, the bottom of the shielding box body is inserted into the electromagnetic sealing groove, the shielding box body is arranged at the upper end of the conductive foam, and the interior of the shielding box body is of a hollow structure. And the other end of the wire passes through the shielding box bottom plate and is arranged in the hollow structure. The problem that the shielding effect of the shielding box cannot be judged due to the fact that the shielding box cannot be completely opened and cannot completely receive signals without shielding in the prior art is solved. Practicality of the shielding box is improved, and pre-detection test and rectification of detected equipment can be conveniently carried out.

Description

Technical Field

[0001] The utility model relates to the technical field of electromagnetic compatibility, and particularly relates to an electromagnetic shielding box in the field of electromagnetic compatibility. Background Art

[0002] A shielding box is a shielding body made of conductive or magnetic materials in various shapes such as shells, plates, and sleeves, which confines the electromagnetic ability within a certain space range, is a metal body used to suppress radiation interference, and processes conduction and radiation to provide a non-interference test environment for the wireless communication device under test.

[0003] Currently, in the field of electromagnetic compatibility, traditional electromagnetic shielding boxes have complex structures and cannot be fully opened, which is inconvenient for pre-testing, rectifying, etc. of the device under test. Moreover, when only a part of the shielding box is opened, radio signals will enter at the opening, and the rest is blocked by the shielding box body, so that the wireless signal cannot enter, resulting in the internal receiving antenna can only receive external signals from one angle, and the received signal cannot be compared with the signal when it is fully shielded, thus the shielding effect of the shielding box cannot be judged.

[0004] Therefore, how to provide an electromagnetic shielding box in the field of electromagnetic compatibility to solve the defects of the existing electromagnetic shielding box is an urgent technical problem for those skilled in the art. Summary of the Utility Model

[0005] For this reason, the utility model provides an electromagnetic shielding box in the field of electromagnetic compatibility to solve the problem that the shielding effect of the shielding box cannot be judged due to the fact that the shielding box cannot be fully opened and cannot fully receive the signal without shielding in the prior art.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] The utility model discloses an electromagnetic shielding box in the field of electromagnetic compatibility, comprising:

[0008] An electromagnetic sealing groove, the bottom of which is connected to the shielding box bottom plate;

[0009] A conductive foam, installed in the electromagnetic sealing groove;

[0010] A wiring shielding box, installed on the bottom surface of the shielding box bottom plate, and a plurality of wires are arranged in the wiring shielding box;

[0011] A shielding box body, the bottom of which is inserted into the electromagnetic sealing groove, the shielding box body is arranged above the conductive foam, and the inside of the shielding box body is a hollow structure;

[0012] One end of the wire passes through the wiring shielding box, and the other end of the wire passes through the bottom plate of the shielding box and is arranged in the hollow structure.

[0013] In a possible implementation, the electromagnetic sealing groove includes:

[0014] A connecting block, with an outer groove edge installed at the upper end;

[0015] An inner groove edge, installed above the connecting block, the inner groove edge is arranged inside the outer groove edge, a notch is formed between the inner groove edge, the outer groove edge and the connecting block, a conductive foam is installed at the bottom of the notch, and the upper end of the conductive foam is in contact with the bottom surface of the shielding box body.

[0016] In a possible implementation, the top ends of the inner groove edge and the outer groove edge are provided with 45° chamfers, the gap width between the side plate of the shielding box body and the inner groove edge is 0.2 mm, and the height of the outer groove edge is three times the width of the notch.

[0017] In a possible implementation, the wiring shielding box includes:

[0018] A box body, with an extended outer edge provided at the top, and the top of the extended outer edge is installed on the bottom surface of the bottom plate of the shielding box;

[0019] A plurality of threaded holes are opened on the surface of the extended outer edge;

[0020] A plurality of wiring holes are opened on the side plate of the box body, and the wire is inserted into the wiring holes.

[0021] In a possible implementation, the threaded holes are arranged at intervals of 15 cm, the diameter of the wiring holes is 6.5 mm, and the wall thickness of the box body is 1.5 mm.

[0022] In a possible implementation, the bottom plate of the shielding box includes:

[0023] A rectangular plate, installed at the bottom of the electromagnetic sealing groove;

[0024] A plurality of connection grooves are opened on the rectangular plate, and one end of the wire passes through the connection grooves.

[0025] In a possible implementation, the diameter of the connection grooves is 6.5 mm.

[0026] In a possible implementation, the conductive foam is composed of conductive fibers and foam materials.

[0027] In the present utility model, the shielding box body is inserted into the electromagnetic sealing groove. The insertion method facilitates the removal and installation of the shielding box body. When the shielding box body is removed, the receiving antenna can be completely exposed to the air. The receiving antenna can receive wireless signals from all positions, collect the received signals, and then install the shielding box body again. At this time, the receiving antenna cannot receive wireless signals in the air. After collecting the data and comparing it with the situation when the shielding box body is removed, the shielding effect of the shielding box can be significantly seen. At the same time, the setting of the conductive foam reduces the impact and friction between the shielding box body and the electromagnetic sealing groove when repeatedly inserting and removing the shielding box body. Moreover, due to the close contact between the conductive foam and the shielding box body, the shielding effect is better. Not only that, the setting of the shielding box bottom plate is used to shield the electromagnetic waves that may leak from the wiring holes on the shielding box bottom plate, which improves the practicality and facilitates the detection of the shielding effect of the shielding box. Description of the Drawings

[0028] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained based on the provided drawings.

[0029] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limiting conditions under which the present utility model can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present utility model.

[0030] Figure 1 It is a three-dimensional view of the electromagnetic shielding box in the electromagnetic compatibility field provided by the present utility model;

[0031] Figure 2 It is a cross-sectional view of the electromagnetic sealing groove provided by the present utility model;

[0032] Figure 3 It is a three-dimensional view of the wiring shielding box provided by the present utility model;

[0033] Figure 4 It is a three-dimensional view of the shielding box bottom plate provided by the present utility model;

[0034] In the figure: 1 electromagnetic sealing groove; 11 inner groove edge; 12 groove opening; 13 outer groove edge; 14 connecting block; 2 wire; 3 wiring shielding box; 31 wiring hole; 32 box body; 33 threaded hole; 34 extended outer edge; 4 shielding box bottom plate; 41 rectangular plate; 42 wiring groove; 5 conductive foam; 6 shielding box body. Detailed implementation mode

[0035] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] Please refer to Figures 1-4 , and now an electromagnetic shielding box in the field of electromagnetic compatibility disclosed by the present invention will be described. The present invention is composed of six parts, as Figure 1 , including an electromagnetic sealing groove 1, a wire 2, a wiring shielding box 3, a shielding box bottom plate 4, a conductive foam 5 and a shielding box body 6. The bottom of the electromagnetic sealing groove 1 is connected to the shielding box bottom plate 4. The conductive foam 5 is installed in the electromagnetic sealing groove 1. The wiring shielding box 3 is installed on the bottom surface of the shielding box bottom plate 4. A plurality of wires 2 are arranged in the wiring shielding box 3. The bottom of the shielding box body 6 is inserted into the electromagnetic sealing groove 1. The shielding box body 6 is arranged on the upper end of the conductive foam 5. The inside of the shielding box body 6 is a hollow structure. One end of the wire 2 passes through the wiring shielding box 3, and the other end of the wire 2 passes through the shielding box bottom plate 4 and is arranged in the hollow structure.

[0037] When the utility model is in use, assuming that the spectrum in the frequency range of 100KHz - 1GHz is detected, the skin depth of 100KHz electromagnetic wave is about 0.2mm, and the thickness of the metal plate is 10 times the skin depth of 100KHz electromagnetic wave, then the shielding box can shield electromagnetic waves above 100KHz. If it is necessary to shield electromagnetic waves of lower frequencies, the thickness of the main metal plate of the shielding box can be thickened as required to make it much larger than the skin depth of the required shielding frequency. A shielding box with an appropriate thickness is made according to the electromagnetic wave frequency range. In the shielding box within the above frequency range, the thickness of the side plate 6 of the shielding box body should be 2mm, and the thickness of the bottom plate 4 of the shielding box should be 5mm. After the shielding box is made, a monopole antenna with a length of about 5cm is connected to the plug of the internal wire 2 of the shielding box to receive radio signals in space. The plug of the external wire 2 of the shielding box is connected to a spectrum analyzer with a 1-meter RF cable. When the shielding box body 6 is removed and when the shielding box body 6 is installed at the notch 12 at the bottom, the radio signals received by the monopole antenna are respectively detected, and the shielding effect of the shielding box is judged by comparing the radio signals received after shielding, and it is judged whether the shielding box meets the design requirements. The spectrum analyzer will display the radio signal spectrum lines before and after shielding.

[0038] In a specific embodiment, such as Figure 2 , the electromagnetic sealing groove 1 includes an inner groove edge 11, a notch 12, an outer groove edge 13 and a connecting block 14. The outer groove edge 13 is installed at the upper end of the connecting block 14, the inner groove edge 11 is installed above the connecting block 14, the inner groove edge 11 is arranged inside the outer groove edge 13, and a notch 12 is formed between the inner groove edge 11, the outer groove edge 13 and the connecting block 14. A conductive foam 5 is installed at the bottom of the notch 12, and the upper end of the conductive foam 5 is in contact with the bottom of the shielding box body 6. The notch 12 is used for inserting the bottom of the shielding box body 6, and the shielding box body 6 can be easily installed and removed through the insertion structure.

[0039] Based on the previous embodiment, 45° chamfers are provided at the top of the inner groove edge 11 and the outer groove edge 13. The gap width between the side plate of the shielding box body 6 and the inner groove edge 11 is 0.2 mm, and the height of the outer groove edge 13 is three times the width of the slot opening 12. The height of the inner groove edge 11 is greater than the gap width between the side plate of the shielding box body 6 and the inner groove edge 11. The gap width between the side plate of the shielding box body 6 and the inner groove edge 11 is 0.2 mm, and the height of the inner groove edge 11 is 10 cm, further blocking the electromagnetic waves that may leak from the contact gap between the electromagnetic sealing groove 1 and the shielding box body 6. There is a 45-degree chamfer on the inner side of the inner groove edge 11 of the electromagnetic sealing groove 1, which facilitates the placement of the shielding box body 6 into the electromagnetic sealing groove 1. The height of the outer groove edge 13 is lower than that of the inner groove edge 11, but the height of the outer groove edge 13 is about three times larger than the width of the slot opening 12. According to the gap width, the height of the outer groove edge 13 should be taken as 5 cm. The main function is to clamp the shielding box body 6 and the slot opening 12 to prevent the displacement of the shielding box body 6 and further improve the shielding performance. Moreover, there are 45° chamfers on the inner sides of both the inner and outer groove edges of the electromagnetic sealing groove, and the height of the outer groove edge 13 is lower than that of the inner groove edge 11, which facilitates the placement of the shielding box body 6 into the electromagnetic sealing groove 1.

[0040] In a specific embodiment, such as Figure 3 , the wiring shielding box 3 includes a wiring hole 31, a box body 32, a threaded hole 33, and an extended outer edge 34. An extended outer edge 34 is provided at the top of the box body 32, and the top of the extended outer edge 34 is mounted on the bottom surface of the shielding box bottom plate 4. A number of threaded holes 33 are opened on the surface of the extended outer edge 34, and a number of wiring holes 31 are opened on the side plate of the box body 32. A wire 2 is inserted into the wiring hole 31. Through the setting of the threaded holes 33 and then in cooperation with bolts, the wiring shielding box 3 is installed at the bottom end of the shielding box bottom plate 4. Through the design of the wiring holes 31, the wire 2 is installed. The wire 2 is generally a power line, a signal line, etc. The wire 2 is used to supply power to the antenna in the central control structure and transmit signals. Moreover, wiring heads are connected to both ends of the wire 2 to facilitate the connection of various devices. Various filters and other electrical appliances can also be installed in the box body 32 to prevent external electromagnetic interference from entering the shielding box through conduction.

[0041] Based on the previous embodiment, the threaded holes 33 are arranged at intervals of 15 cm, the diameter of the wiring hole 31 is 6.5 mm, and the wall thickness of the box body 32 is 1.5 mm. The number and diameter of the wiring holes 31 can be increased or decreased according to actual requirements.

[0042] In a specific embodiment, such as Figure 4, the bottom plate 4 of the shielding box includes a rectangular plate 41 and a connection groove 42. The rectangular plate 41 is installed at the bottom of the electromagnetic sealing groove 1, and a number of connection grooves 42 are formed on the rectangular plate 41. One end of the wire 2 passes through the connection groove 42. The electromagnetic sealing groove 1 is connected to the bottom plate 4 of the shielding box by welding or screwing to ensure that the electromagnetic sealing groove 1 is in close contact with the bottom plate 4 of the shielding box, forming a whole metal base. To further ensure the close contact between the electromagnetic sealing groove 1 and the bottom plate 4 of the shielding box, the electromagnetic sealing groove 1 and the bottom plate 4 of the shielding box can also be integrally formed by CNC machining from a whole metal plate. The seams between the metal plates of the shielding box body 6 are connected into one body by welding. The shielding box body 6 can also be made by other methods such as die-casting, as long as it is ensured that the main body of the shielding box is a whole, there is no gap at the joints of the five metal plates, and at the same time, the shielding box body 6 can also be integrally formed by CNC machining from a whole metal plate. Generally, aluminum plates or copper plates are used for the metal plates.

[0043] Based on the previous embodiment, the diameter of the connection groove 42 is 6.5 mm. The same kind of wire will be installed in the connection groove 42 and the wiring hole 31, so generally the diameters of the connection groove 42 and the wiring hole 31 are the same. The opening diameters of the connection groove 42 and the wiring hole 31 are determined according to the diameter and quantity of the wire 2.

[0044] In a specific embodiment, the conductive foam 5 is composed of conductive fibers and foam materials. The conductive foam refers to a flame-retardant sponge wrapped with conductive cloth, which has good surface conductivity after a series of treatments. The shielding box body 6 is placed into the electromagnetic sealing groove 1 from the upper part of the electromagnetic sealing groove 1. Depending on the weight of the shielding box body 6, the upper surface of the conductive foam 5 is in close contact with the lower edge of the shielding box body 6, thus forming a complete metal shielding box body to achieve the purpose of shielding the electromagnetic waves outside the shielding box body. The setting of the foam material can also prevent the bottom of the shielding box body 6 from directly contacting the bottom of the slot opening 12, effectively avoiding damage caused by friction, and can also slow down the impact force when the shielding box body 6 is inserted into the electromagnetic sealing groove 1.

[0045] Although the present invention has been described in detail above with general descriptions and specific embodiments, on the basis of the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

Claims

1. An electromagnetic shielding box in the field of electromagnetic compatibility, characterized in that: include: The electromagnetic sealing groove (1) has a bottom connected to a shielding box bottom plate (4); Conductive foam (5), installed in the electromagnetic sealing groove (1); A wiring shielding box (3) is mounted on the bottom surface of the shielding box bottom plate (4), wherein a plurality of wires (2) are arranged in the wiring shielding box (3); A shielding box (6), the bottom of which is inserted into the electromagnetic sealing groove (1), the shielding box (6) is arranged on the upper end of the conductive foam (5), and the interior of the shielding box (6) is a hollow structure; One end of the wire (2) passes through the wiring shielding box (3), and the other end of the wire (2) passes through the shielding box bottom plate (4) and is arranged in the hollow structure.

2. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 1, characterized in that: The electromagnetic sealing groove (1) comprises: A connecting block (14) having an outer groove edge (13) mounted on the upper end; An inner groove edge (11) is installed above the connecting block (14); the inner groove edge (11) is arranged inside the outer groove edge (13); a notch (12) is formed between the inner groove edge (11), the outer groove edge (13) and the connecting block (14); a conductive foam (5) is installed at the bottom of the notch (12); the upper end of the conductive foam (5) is in contact with the bottom of the shielding box (6).

3. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 2, characterized in that: The top ends of the inner groove edge (11) and the outer groove edge (13) are provided with a 45° chamfer, the width of the gap between the side plate of the shielding box (6) and the inner groove edge (11) is 0.2 mm, and the height of the outer groove edge (13) is three times the width of the slot (12).

4. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 1, characterized in that: The wiring shielding box (3) comprises: The box body (32) is provided with an extended outer edge (34) at the top, and the top of the extended outer edge (34) is mounted on the bottom surface of the shielding box bottom plate (4); A plurality of threaded holes (33) are provided on the surface of the extended outer edge (34); A plurality of wiring holes (31) are provided on the side plate of the box body (32), and the wires (2) are inserted into the wiring holes (31).

5. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 4, characterized in that: The threaded holes (33) are arranged at intervals of 15 cm, the wiring hole (31) has a diameter of 6.5 mm, and the wall thickness of the box body (32) is 1.5 mm.

6. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 1, characterized in that: The shielding box bottom plate (4) comprises: A rectangular plate (41) mounted on the bottom of the electromagnetic sealing groove (1); A plurality of wiring grooves (42) are provided on the rectangular plate (41), and one end of the wire (2) passes through the wiring groove (42).

7. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 6, characterized in that: The diameter of the wiring groove (42) is 6.5 mm.

8. The electromagnetic shielding box in the field of electromagnetic compatibility as claimed in claim 1, characterized in that: The conductive foam (5) is composed of conductive fibers and foam material.

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