CN217694188U

CN217694188U - Combined electromagnetic shielding cover

Info

Publication number: CN217694188U
Application number: CN202220015580.1U
Authority: CN
Inventors: 熊志飞; 文微; 廖俊安
Original assignee: Edan Instruments Inc
Current assignee: Edan Instruments Inc
Priority date: 2022-01-04
Filing date: 2022-01-04
Publication date: 2022-10-28
Anticipated expiration: 2032-01-04

Abstract

The utility model discloses a combination electromagnetic shield cover, establish including shielding box and lid shielding lid on the shielding box, the shielding box with the surface coating of shielding lid has the electrically conductive paint layer, the shielding box with the hookup location department of shielding lid is equipped with sealedly the shielding box with the electrically conductive liner in gap between the shielding lid. By the design, the conductive gasket can seal a connecting gap between the shielding box and the shielding cover, so that the whole shielding cover is ensured to form a complete and continuous conductor, and the electromagnetic shielding requirement of medical electronic equipment under a complex electromagnetic environment can be met.

Description

Combined electromagnetic shielding cover

Technical Field

The utility model relates to the technical field of medical equipment, concretely relates to combination electromagnetic shield cover.

Background

Shielding is used to electromagnetically isolate two spatial regions by a metal material (or a metal coating on an insulating material), and the purpose is two: one is to prevent extraneous electromagnetic radiation from entering the device (or system); secondly, the radiated electromagnetic interference inside the equipment (or system) is limited in a certain area.

The presence of a large number of sensitive electronic components in the medical electronic device may cause malfunction or even damage due to external complex electromagnetic interference, or may radiate electromagnetic waves to other types of external sensitive electronic devices. Rectangular metal shields are widely used to protect circuits in medical electronics due to their low cost and simple process.

However, in practice, the protection circuit inside the metal shielding case must be electrically connected with the outside, and holes or gaps are inevitably formed in the metal shielding case due to the processing problem, so that the shielding effect of the existing metal shielding case is poor, and the requirements of medical electronic equipment on complex electromagnetic environments cannot be met in some occasions.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the defect that the shielding effect of metal shield cover is poor among the prior art, is not enough to satisfy medical electronic equipment to complicated electromagnetic environment's shielding requirement to a combination electromagnetic shield cover is provided.

In order to solve the technical problem, the technical scheme of the utility model as follows:

the utility model provides a combination electromagnetic shield cover, is established including shielding box and lid shielding lid on the shielding box, the shielding box with the hookup location department of shielding lid is equipped with sealedly the shielding box with the electrically conductive gasket in gap between the shielding lid.

Further, the conductive gasket comprises an elastic body and conductive cloth coated on the periphery of the elastic body.

Further, surfaces of the shield case and the shield cover are coated with a conductive paint layer.

Further, the conductive paint layer is graphite conductive paint.

Further, wave-absorbing material layers are attached to the inner surfaces of the shielding box and the shielding cover.

Furthermore, the wave-absorbing frequency range of the wave-absorbing material layer is 10MHz-6GHz.

Further, the material of the shielding box and the shielding cover is metal aluminum.

Further, the shielding box comprises a box body main body with an opening at the top and an extending edge extending from the top of the box body main body to the outer side of the shielding box; extend the edge and be equipped with a plurality of shielding box connecting hole, the shielding cover be equipped with a plurality of shielding cover connecting hole that shielding box connecting hole position one-to-one set up, shielding cover connecting hole with wear to establish between the shielding box connecting hole and be fixed with electrically conductive connecting piece.

Furthermore, a plurality of shielding box lug holes are further formed in the extending edges, and a plurality of connecting lug plates which are inserted into the shielding box lug holes corresponding to the positions are formed in the shielding cover in a bending mode.

Furthermore, the shielding cover comprises a cover plate main body and a flanging which is integrally formed on the edge of the cover plate main body, and the flanging is attached to the inner side wall of the shielding box.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a combination electromagnetic shield cover sets up electrically conductive liner in the hookup location department of shielding box and shielding lid, and electrically conductive liner can seal the connection gap between shielding box and the shielding lid, guarantees that whole shielding cover forms a complete, continuous electric conductor, can satisfy medical electronic equipment's under the complicated electromagnetic environment shielding demand.

2. The utility model provides a combination electromagnetic shield cover, electrically conductive liner include elastomer and the cladding at the electrically conductive cloth of elastomer periphery, and electrically conductive cloth can satisfy the electrically conductive demand in electrically conductive liner surface, and the elastomer can realize shielding box and shielding lid between well sealed, guarantees that the shield cover can form a complete continuous electric conductor.

3. The utility model provides a combination electromagnetic shield cover, the surface coating conductive paint layer of shielding box and shielding lid can prevent that the metallic material of shielding box and shielding lid from by the oxidation and influencing electromagnetic shielding performance's problem.

4. The utility model provides a combination electromagnetic shield cover, graphite conductive paint not only have good electric conductivity, are difficult for taking place the oxidation moreover.

5. The utility model provides a combination electromagnetic shield cover, the internal surface of shielding box and shielding lid is attached to have a wave-absorbing material layer, and the wave-absorbing material layer can absorb the electromagnetic wave, is showing the anti-electromagnetic interference ability that improves medical electronic equipment.

6. The utility model provides a combination electromagnetic shield cover, the material of shielding box and shielding lid are metallic aluminum, and metallic aluminum is strong to electromagnetic radiation's reflective capability, is favorable to improving the shielding effect of shielding cover.

7. The utility model provides a combination electromagnetic shield cover sets up the extension limit on the shielding box, and the shielding lid is fixed through electrically conductive connecting piece with the extension limit, can guarantee the connection reliability of shielding lid and shielding box, and electrically conductive connecting piece can also put through the shielding cover to ground, forms a combination shielding cover that has good ground plane, shielding effectiveness height.

8. The utility model provides a combined electromagnetic shielding cover, a plurality of shielding box ear holes are arranged on the extending edge, and a plurality of connecting ear plates inserted on the shielding box ear holes corresponding to the positions are formed on the shielding cover in a bending way; in the assembling process, the connecting lug plate on the shielding cover is inserted into the lug hole of the shielding box on the extending edge, and then the connecting lug plate is bent by a tool, so that the shielding cover and the extending edge can be tightly attached.

9. The utility model provides a combination electromagnetic shield cover, the inboard edge of shielding lid edge turn-ups and shielding box is laminated mutually, can make shielding lid and shielding box form good electric overlap joint structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is an exploded view of a combined electromagnetic shield according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a shielding box according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a shielding cover according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a conductive pad according to an embodiment of the present invention.

Description of reference numerals: 1. a shield case; 11. a box body main body; 111. a connector interface aperture; 12. an extension edge; 121. a shield case connection hole; 122. shielding the box ear hole; 13. connecting columns; 2. a shield cover; 21. connecting the ear plates; 22. flanging; 201. a shield cover connection hole; 3. a conductive pad; 31. a gasket broadside; 311. a pad connection hole; 312. cushion ear holes; 32. a gasket narrow edge; 4. and the wave-absorbing material layer.

Detailed Description

The technical solutions of the present invention will be described more clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as a specific case by those skilled in the art.

A combination electromagnetic shield as shown in fig. 1-4 includes a shield can 1, a shield cover 2, and a conductive gasket 3. The shielding cover 2 is covered at the opening position of the shielding box 1, and the conductive gasket 3 is sealed and arranged at the connecting gap between the shielding box 1 and the shielding cover 2.

According to the combined electromagnetic shielding case, the conductive gasket 3 is arranged at the connecting position of the shielding box 1 and the shielding cover 2, the conductive gasket 3 can ensure that the whole shielding case forms a complete and continuous conductor, and the shielding requirement of medical electronic equipment under a complex electromagnetic environment can be met.

In some embodiments, the materials of the shield case 1 and the shield cover 2 are both metallic aluminum. In an alternative embodiment, the shielding box 1 and the shielding cover 2 may also adopt a structure of an insulating material + an outer-clad metal aluminum plate. The metal aluminum has strong reflection capability to electromagnetic radiation, and is beneficial to improving the shielding effect of the shielding case.

In some embodiments, the inner and outer surfaces of the shielding box 1 and the shielding cover 2 are coated with a conductive paint layer, preferably a graphite conductive paint, which not only has good conductivity, but also has high stability and is not easy to be oxidized. In an alternative embodiment, paint containing composite particles of copper, silver and the like and having good conductivity can also be used as the conductive paint layer. The conductive paint layer can prevent the problem that the metal materials of the shielding box 1 and the shielding cover 2 are oxidized to affect the electromagnetic shielding performance.

In some embodiments, a wave absorbing material layer 4 is attached to the inner surface of the shielding box 1 and the shielding cover 2; for example, when the shield is in the form of a cuboid, a layer 4 of wave-absorbing material is attached to each of the six inner walls of the shield. The wave-absorbing material layer 4 can absorb electromagnetic waves, and the anti-electromagnetic interference capability of the medical electronic equipment is obviously improved. The wave-absorbing material layer 4 is made of wave-absorbing material with the magnetic permeability of 120 mu under the frequency of 1MHz, and the application frequency range of the wave-absorbing material layer 4 is 10MHz-6GHz. The wave-absorbing material layer 4 is preferably made of a wave-absorbing material which has good flexibility, bending resistance, easy die cutting and low thermal resistance and meets the RoHS and HF standards.

In some embodiments, the conductive pad 3 includes an elastomer and a conductive cloth coated on the periphery of the elastomer; the elastomer may specifically be a foamed rubber. The conductive cloth can meet the surface conductive requirement of the conductive gasket 3, the elastic body can realize good sealing between the shielding box 1 and the shielding cover 2, and the shielding cover can form a complete and continuous conductive body.

In some embodiments, the shield case 1 has a rectangular parallelepiped shape, the shield case 1 includes a case body main body 11 and an extension side 12, a top of the case body main body 11 has an opening, and the extension side 12 extends from the top of the case body main body 11 to an outer side of the shield case 1. The extending edges 12 are perpendicular to the side walls of the box body 11, and two extending edges 12 are formed integrally with two long side walls of the box body 11. The two ends of the two extending sides 12 in the length direction are both provided with shielding box connecting holes 121. The shielding cover 2 is square, and four shielding cover connection holes 201 are formed at four corners of the shielding cover 2. The conductive gasket 3 is in a shape of Chinese character 'hui', the conductive gasket 3 comprises two gasket wide sides 31 and two gasket narrow sides 32, the two gasket wide sides 31 and the two extending sides 12 are correspondingly arranged, the gasket wide sides 31 and the extending sides 12 are identical in size, and the width of the gasket narrow sides 32 is identical to the wall thickness of the short side walls of the box body main body 11. Both ends of the two gasket wide sides 31 in the length direction are provided with gasket connecting holes 311, and the positions of the four shielding box connecting holes 121, the four gasket connecting holes 311 and the four shielding cover connecting holes 201 are arranged in a one-to-one correspondence manner. Conductive connectors are fixedly inserted between a corresponding set of the shield cover coupling holes 201, the gasket coupling holes 311, and the shield case coupling holes 121. The conductive connecting piece is fixed between the extending edges 12 of the shielding cover 2 and the shielding box 1, so that the shielding cover 2 and the shielding box 1 are matched to compress the conductive gasket 3 to ensure the sealing performance of the connecting position of the shielding cover 2 and the shielding box 1, and the conductive connecting piece can connect the shielding cover to the ground to form a combined shielding cover with a good grounding plane and high shielding efficiency. Specifically, the shield cover connecting hole 201 and the shield box connecting hole 121 are both threaded holes, and the conductive connecting piece is a metal screw; of course, the shielding cover connecting hole 201 and the shielding box connecting hole 121 may also be circular holes, the conductive connecting member is a metal bolt, the outer diameter of the screw of the metal bolt is the same as the diameter of the circular hole, the two ends of the screw are in threaded connection with the metal bolt, and the extending edges 12 of the shielding cover 2 and the shielding box 1 can be matched to compress the conductive gasket 3 by adjusting the two metal bolts. It is understood that the shape of the shield case 1 is not limited to the rectangular parallelepiped shape, but may be any shape such as a cylindrical shape, and accordingly, the outer shapes of the conductive pad 3 and the cover plate are adapted to the outer shape of the shield case 1.

In some embodiments, two shielding box ear holes 122 are further formed on the extending edge 12, and the two shielding box ear holes 122 are located between the two shielding box connecting holes 121; each gasket broadside 31 is provided with two gasket ear holes 312 which are in one-to-one correspondence with the positions of the two shielding box ear holes 122, each of the shielding box ear holes 122 and the gasket ear holes 312 is a strip-shaped hole and has the same size and shape, and the shielding cover 2 is bent and formed with four connecting ear plates 21 which are inserted into the shielding box ear holes 122 and the gasket ear holes 312 corresponding to the positions. The shield cover 2 is not assembled before the shield case 1, and the extending direction of the four connecting lug plates 21 is perpendicular to the shield cover 2; in the assembly process of the shielding cover 2 and the shielding box 1, the connecting ear plate 21 is inserted into the gasket ear hole 312 and the shielding box ear hole 122, and then the part of the connecting ear plate 21 penetrating out of the shielding box ear hole 122 is bent by a tool, which is beneficial for the shielding cover 2 and the extending edge 12 to be matched and pressed on the conductive lining plate.

In some embodiments, the shielding cover 2 has flanges 22 at the edges of the two short sides, the flanges 22 are perpendicular to the main body of the shielding cover 2, and after the shielding cover 2 and the shielding box 1 are assembled together, the flanges 22 are attached to the inner side walls of the shielding box 1. By adopting the design, the shielding cover 2 and the shielding box 1 are favorable for forming a good electrical lap joint structure.

In some embodiments, the four corners of the bottom wall of the box body main body 11 are provided with the connection posts 13, the connection posts 13 are provided with threaded holes, and the circuit board is placed on the four connection posts 13 and fixed on the threaded holes of the connection posts 13 through metal screws, so as to ensure good contact between the circuit board and the connection posts 13. A connector interface hole 111 is further formed in the side wall of the box body main body 11, and a hole with the same shape as the connector interface hole 111 is also formed in the wave-absorbing material layer 4 corresponding to the side wall; the connector interface hole 111 is used for connecting with a connector inserted into the main body 11, and a cable connected to the circuit board is electrically connected to an external circuit through the connector.

In summary, the combined electromagnetic shielding case comprises a shielding box 1, a shielding cover 2, a conductive gasket 3 and a wave-absorbing material layer 4. The shielding box 1 is made of metal aluminum, graphite conductive paint is sprayed on the inner side and the outer side of the shielding box 1 and the shielding cover 2, then a wave absorbing material layer 4 with high magnetic conductivity is attached, and the shielding box 1 is in contact with the shielding cover 2 and is pressed by a conductive gasket 3. The electromagnetic shielding cover effectively utilizes the high electromagnetic reflection loss of the metallic aluminum shielding cover, and solves the problems that the metallic aluminum electromagnetic shielding cover is easy to oxidize and has insufficient shielding effectiveness by spraying the graphite conductive paint on the surface of the metallic aluminum shielding cover; and shielding box 1 and shielding lid 2 use the reasonable overlap joint of electrically conductive liner 3, make the combination shield cover have better electrically conductive continuity, laminating high magnetic conductivity absorbing material layer 4 then can further decay the magnetic field, can show improvement medical electronic equipment anti-electromagnetic interference ability.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. The utility model provides a combination electromagnetic shield cover, its characterized in that is established including shielding box (1) and lid shielding lid (2) on shielding box (1), shielding box (1) with the hookup location department of shielding lid (2) is equipped with sealedly shielding box (1) with electrically conductive gasket (3) in gap between shielding lid (2).

2. The combination electromagnetic shield of claim 1, wherein the conductive gasket (3) comprises an elastomer and a conductive cloth covering the periphery of the elastomer.

3. A combined electromagnetic shielding according to claim 1, characterized in that the surfaces of the shielding box (1) and the shielding cover (2) are coated with a layer of conductive paint.

4. The combination electromagnetic shield of claim 3, wherein the layer of conductive paint is a graphite conductive paint.

5. A combined electromagnetic shield according to claim 1, characterized in that a layer of wave-absorbing material (4) is attached to the inner surface of the shield can (1) and the shield cover (2).

6. A combined electromagnetic shield according to claim 5, characterised in that the wave-absorbing material layer (4) has a wave-absorbing frequency in the range of 10MHz-6GHz.

7. A combined electromagnetic shield according to claim 1, characterized in that the material of the shield can (1) and the shield cover (2) is metallic aluminum.

8. The combination electromagnetic shield according to claim 1, wherein the shield box (1) comprises a box body (11) having an opening at the top and an extending edge (12) extending from the top of the box body (11) to the outside of the shield box (1); extend and be equipped with a plurality of shielding box connecting hole (121) on limit (12), be equipped with on shielding lid (2) with a plurality of shielding box connecting hole (121) a plurality of shielding lid connecting hole (201) that position one-to-one set up, shielding lid connecting hole (201) with wear to establish between shielding box connecting hole (121) and be fixed with conductive connecting piece.

9. The combined electromagnetic shielding cover according to claim 8, wherein the extension edge (12) is further provided with a plurality of shielding box ear holes (122), and the shielding cover (2) is formed with a plurality of connecting ear plates (21) inserted into the shielding box ear holes (122) at corresponding positions in a bending manner.

10. A combined electromagnetic shielding case according to claim 8, characterized in that the shielding cover (2) is provided with a flange (22) at the edge, and the flange (22) is attached to the inner side wall of the shielding box (1).