Military power supply box body with high electromagnetic shielding property

Abstract

The utility model provides a military power supply box with high electromagnetic shielding performance, and relates to the field of military electromagnetic shielding equipment, and the power supply box comprises a box body which is provided with a sealing groove at the top; the cover plate is detachably connected with the top of the box body; the sealing rubber strip is embedded in the sealing groove, and at least part of the sealing rubber strip protrudes out of the top surface of the box body; the sealing rubber strip comprises a rubber strip body made of a non-conductive material; the conductive adhesive layer covers one side of the adhesive tape body, the bottom of the conductive adhesive layer is in contact with the bottom of the sealing groove of the box body, and the top of the conductive adhesive layer is in contact with the cover plate; and the back adhesive is arranged on one side, far away from the conductive adhesive layer, of the adhesive tape body and is used for bonding the adhesive tape body in the sealing groove. The power supply box has the effect of improving the electromagnetic shielding performance of the power supply box.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of military electromagnetic shielding equipment, and in particular to a military high-electromagnetic-shielding power supply box. BACKGROUND

[0002] In modern military equipment, electromagnetic compatibility (EMC) and anti-electromagnetic interference capability (EMI) are one of the core technologies to ensure the reliable operation of key electronic equipment. As a core component of power supply, the military power supply box not only needs to provide stable power output, but also must have extremely high electromagnetic shielding performance to prevent external electromagnetic interference from entering the device interior, while suppressing the electromagnetic leakage of the device itself to avoid exposure or affecting the normal operation of other devices. In the electromagnetic shielding design, the sealing structure of the power supply box body and the box cover is the key link of the electromagnetic shielding performance. Since the electromagnetic shielding of the power supply box usually relies on a complete metal shielding shell or a continuous shielding layer composed of conductive materials, the joint between the box body and the box cover is prone to become a "weak point" of electromagnetic leakage.

[0003] In the related art, the Chinese utility model patent with the application number 201920690726.0 proposes a military anti-stretch B-type conductive adhesive tape body, which sets the B-type adhesive tape body and sets the conductive rubber on one side of the adhesive tape body to form an electromagnetic shielding sealed cavity, sets the high-strength wire for anti-stretching in the adhesive tape body, sets the cavity for elastic deformation in the cross-section direction in the adhesive tape body, and sets the double-sided adhesive tape on the bottom of the adhesive tape body. In actual application, the cover plate extrudes the adhesive tape body to deform horizontally, so that the two sides of the adhesive tape body are tightly attached to the side walls of the box body groove to increase the electromagnetic shielding performance.

[0004] In the related art, since the double-sided adhesive tape is arranged at the bottom of the adhesive tape body, the deformation amounts of the two sides of the adhesive tape body are almost the same during the extrusion and deformation of the adhesive tape body, and the deformation of the side of the adhesive tape body away from the conductive rubber does not actually help to improve the electromagnetic shielding capability, but occupies almost half of the deformation allowance of the adhesive tape body. With the extension of the use time and the increase of the number of opening and closing of the cover, the electromagnetic shielding capability of the box gradually decreases. UTILITY MODEL CONTENT

[0005] In order to improve the problem that the electromagnetic shielding performance of the box decreases with the extension of the use time, the application provides a military high-electromagnetic-shielding power supply box.

[0006] The military high-electromagnetic-shielding power supply box provided by the application adopts the following technical scheme:

[0007] A military high-electromagnetic-shielding power supply box comprises:

[0008] The box body is provided with a sealing groove at the top;

[0009] a cover plate detachably connected to the top of the box body; and

[0010] a sealing rubber strip embedded in the sealing groove and protruding at least partially from the top surface of the box body;

[0011] The sealing rubber strip comprises:

[0012] a rubber strip body made of non-conductive material;

[0013] a conductive rubber layer covering one side of the rubber strip body, the bottom of the conductive rubber layer being in contact with the bottom of the sealing groove of the box body, and the top of the conductive rubber layer being in contact with the cover plate;

[0014] a back adhesive provided on the side of the rubber strip body away from the conductive rubber layer, for bonding the rubber strip body in the sealing groove.

[0015] Further, the conductive rubber layer is located on the side of the rubber strip body close to the inner side of the box body.

[0016] Further, the top surface of the box body is provided with a folded edge inwardly, and the sealing groove is located on the folded edge.

[0017] Further, the top of the box body is provided with a plurality of screw holes outside the sealing groove, and the cover plate is provided with a plurality of through holes, the plurality of through holes corresponding one-to-one to the plurality of screw holes.

[0018] Further, the rubber strip body has a B-shaped cross section, and a certain thickness of space is reserved on one side of the B-shaped cross section, and the conductive rubber layer covers the space to form a symmetrical B-shaped cross section together with the rubber strip body.

[0019] Further, the rubber strip body is provided with high-strength wires inside along the length direction of the rubber strip body to prevent excessive stretching.

[0020] Further, the high-strength wires are metal wires or high-strength fibers.

[0021] Further, the high-strength wires are nickel-copper metal wires.

[0022] Further, the rubber strip body is provided with a cavity inside along the length direction of the rubber strip body for elastic deformation of the rubber strip body along the cross-sectional direction.

[0023] Further, the rubber strip body is made of non-conductive rubber or non-conductive silicone material, and the conductive rubber layer is made of conductive rubber or conductive silicone material.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. By setting the back glue on the side of the rubber strip body close to the side away from the conductive glue layer, the deformation allowance of the rubber strip body is almost all deviated to the side of the conductive glue layer when being extruded, so that the conductive glue layer is tightly attached to the inner wall of the sealing groove, thereby greatly improving the electromagnetic sealing performance of the power box body;

[0026] 2. The back glue is arranged on the side of the rubber strip body, compared with being arranged on the bottom of the rubber strip body, the back glue does not need to have conductive performance, thereby saving material cost, and also reducing the influence on the conductivity of the conductive glue layer, so that the sealing body has better conductivity, and the electromagnetic sealing performance of the power box body is further improved;

[0027] 3. By setting the inner folding edge on the top surface of the box body, setting the groove on the folding edge, and setting a plurality of screw holes outside the sealing groove, the cover plate is locked on the box body through the screws, and since this side has a certain elasticity, a certain contact pressure is maintained between the cover plate and the box body, so that the possibility of relaxation of the sealing strip compression force caused by rigid fixation, or the possibility of failure of the sealing strip without compression force caused by loosening of the screws is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the present application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0029] Figure 1 is an overall structure explosion schematic diagram of the embodiment of the present application.

[0030] Figure 2 is a front view of the box body of the embodiment of the present application.

[0031] Figure 3 is Figure 2 is an enlarged schematic diagram of part A in

[0032] Fig. 1, box; 11, sealing groove; 12, folding edge; 13, screw hole; 2, cover plate; 21, through hole; 3, sealing rubber strip; 31, rubber strip body; 311, cavity; 32, conductive glue layer; 33, back glue; 34, high-strength wire. DETAILED DESCRIPTION

[0033] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below in conjunction with the drawings in the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] The embodiments of the present application disclose a military high electromagnetic shielding power supply box. Please refer to Figure 1 The military high electromagnetic shielding power supply box comprises a box body 1, a cover plate 2 and a sealing rubber strip 3. The box body 1 is a rectangular box. A sealing groove 11 is formed in the top of the box body 1. The sealing groove 11 is a rectangular ring and is used for placing a sealing member. The cover plate 2 is a rectangular plate with a cross section size adapted to the box body 1. The cover plate 2 is detachably connected with the box body 1. The sealing rubber strip 3 is embedded in the sealing groove 11 and at least partially protrudes from the top surface of the box body 1. In actual use, the sealing rubber strip 3 at least partially protrudes from the top surface of the box body 1, so that the cover plate 2 is in full contact with the sealing rubber strip 3, thereby realizing the sealing function.

[0035] The sealing rubber strip 3 comprises a rubber strip body 31, a conductive rubber layer 32 and a back adhesive 33. As shown in Figure 3 The rubber strip body 31 is made of a non-conductive material, specifically a non-conductive rubber or a silica gel base material with an additive with corrosion resistance. The conductive rubber layer 32 is made of a high polymer material with aluminum silver particles, which is made of a rubber or a silica gel base material. The rubber strip body 31 has a deformable double peak at the top. The cross section of the rubber strip body 31 is similar to a B type. The conductive rubber layer 32 and the rubber strip body 31 are formed by a co-extrusion process, which is coated on one peak, a corresponding side and a part of the bottom of the rubber strip body 31, and forms a sealing rubber strip 3 with a B type symmetrical cross section structure. When the sealing rubber strip 3 is installed in the sealing groove 11, the bottom of the conductive rubber layer 32 is in contact with the bottom of the sealing groove 11 of the box body 1, and the top is in contact with the bottom surface of the cover plate 2, so as to realize the conduction between the cover plate 2 and the box body 1 when sealing, thereby making the box body 1 have good electromagnetic shielding function. The back adhesive 33 is a conventional back adhesive 33, which is arranged on the side of the rubber strip body 31 away from the conductive rubber layer 32, and is used for bonding and fixing the rubber strip body 31 on the side wall of the sealing groove 11.

[0036] The back adhesive 33 is arranged on the side of the adhesive strip body 31 away from the conductive adhesive layer 32, so that when the cover plate 2 presses the adhesive strip body 31, almost all the deformation of the adhesive strip body 31 directly acts on the conductive side, so that the conductive adhesive layer 32 is in close contact with the side wall of the sealing groove 11, thereby greatly improving the electromagnetic shielding performance of the product. Compared with before the improvement, about 20% of the products have electromagnetic shielding performance degradation after about two years of use, and after the improvement, the electromagnetic shielding failure rate is reduced by about 50% after about two years of use, and only about 10% of the products cannot meet the harsh requirements of the military. And because the back adhesive 33 is arranged on the non-conductive side, the back adhesive 33 does not need to have conductive performance and will not affect the electromagnetic shielding performance of the overall sealing structure, so that the back adhesive 33 can use conventional back adhesive 33 (such as ordinary double-sided adhesive), compared with the conductive adhesive tape arranged on the bottom of the adhesive strip body 31 before, it can effectively save material cost and not affect the conductivity of the box body 1 and the box cover, thereby improving the electromagnetic shielding performance of the product.

[0037] In the embodiment, the conductive adhesive layer 32 is arranged on the side of the adhesive strip body 31 close to the inner side of the box body 1, that is, the conductive adhesive layer 32 is arranged on the inner side of the adhesive strip body 31, and the back adhesive 33 is arranged on the outer side of the adhesive strip body 31. When the cover plate 2 presses the sealing adhesive strip 3, the top double peaks of the sealing adhesive strip 3 are in contact with the cover plate 2 to form double sealing, the top of the conductive adhesive layer 32 is located on the inner side peak, and the side and bottom can be tightly attached to the inner wall close to the inner side of the sealing groove 11, so that the conductive adhesive layer 32 is basically isolated from the external environment, and even in harsh environments such as high altitude or underwater, the electromagnetic shielding performance required by the military can be maintained.

[0038] In the embodiment, please refer to Figure 3 In one B-type cross section of the sealing adhesive strip 3, at the bottom, one part close to the outer side is the adhesive strip body 31 of non-conductive material, one part close to the inner side is the conductive adhesive layer 32 of conductive material, on the outer side, it is the adhesive strip body 31 and the back adhesive 33 adhered thereto, on the inner side, it is the conductive adhesive layer 32, at the top, one part close to the outer side is the adhesive strip body 31, and one part close to the inner side is the conductive adhesive layer 32. The B-type sealing structure with double peaks has the effects of water vapor sealing and electromagnetic sealing, and can also adapt to differential pressure sealing effect under different internal and external pressures, can better cope with underwater equipment sealing or sealing in other pressure difference occasions, and can be widely used in special fields such as aerospace, weapons and ships, national defense technology, etc.

[0039] In order to further improve the electromagnetic shielding performance of the product, please refer to Figure 1 and Figure 2The top surface of the box body 1 is provided with a folded edge 12 on the inner side, and the sealing groove 11 is arranged on the folded edge 12. The cover plate 2 is fixedly connected with the box body 1 by screws. That is, the outer side of the box body 1 and the sealing groove 11 is provided with a plurality of screw holes 13, and the cover plate 2 is provided with a plurality of through holes 21. The plurality of through holes 21 correspond to the plurality of screw holes 13 one by one. In the embodiment, the screw holes 13 and the through holes 21 are both provided with four, which are located at the four corners of the box body 1 or the cover plate 2. When the cover plate 2 is installed on the box body 1, the screw holes 13 are aligned with the through holes 21, and the cover plate 2 and the box body 1 can be fixed by screws. Because the bottom of the folded edge 12 is in a suspended state, and the metal material has a certain elasticity, there is a certain contact pressure between the cover plate 2 and the box body 1 in the fastened state by the screws. The possibility that the electromagnetic shielding performance of the product is invalid due to the relaxation of the compression force of the rubber strip body 31 or the loosening of the screws is reduced.

[0040] In order to avoid the rubber strip body 31 from being excessively stretched in the length direction, a high-strength wire 34 is arranged inside the rubber strip body 31 along the length direction of the rubber strip body 31. The high-strength wire 34 is made of a metal wire or a high-strength fiber. In the embodiment, the high-strength wire 34 is made of a nickel-copper metal wire which has good processing and practical effects. By arranging the high-strength wire 34, the rubber strip body 31 is difficult to stretch in the length direction, so as to facilitate the accurate installation of the rubber strip body 31, and the deformation direction is concentrated in the cross-sectional direction, the adhesion degree of the conductive adhesive layer 32 to the inner wall of the sealing groove 11 is improved, and the electromagnetic shielding performance of the product is further improved.

[0041] In order to improve the deformation ability of the rubber strip body 31 in the cross-sectional direction, a cavity 311 for elastic deformation of the rubber strip body 31 in the cross-sectional direction is arranged in the middle of the rubber strip body 31 along the length direction of the rubber strip body 31. When the cover plate 2 extrudes the rubber strip body 31, the conductive adhesive layer 32 can be fully adhered to the sealing groove 11, so as to ensure the sealing and electromagnetic shielding performance.

[0042] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A military high electromagnetic shielding power supply case characterized by, The utility model relates to a box with a sealing groove in the top, a detachable cover plate, and a sealing rubber strip embedded in the sealing groove and protruding from the top surface of the box. The sealing rubber strip comprises: a rubber strip body made of non-conductive material, a conductive rubber layer covering one side of the rubber strip body, with the bottom contacting the bottom of the sealing groove and the top contacting the cover plate, and a back adhesive on the side of the rubber strip body away from the conductive rubber layer, used to bond the rubber strip body in the sealing groove. The conductive rubber layer is located on the side of the rubber strip body close to the inner side of the box. The top surface of the box is provided with a folded edge on the inner side, and the sealing groove is located on the folded edge. The top of the box is provided with a plurality of screw holes on the outer side of the sealing groove, and the cover plate is provided with a plurality of through holes corresponding to the screw holes. The rubber strip body has a B-shaped cross section, and a certain thickness of space is reserved on one side of the B-shaped cross section, and the conductive rubber layer covers the space to form a symmetrical B-shaped cross section with the rubber strip body.

2. The military high electromagnetic shielding power supply box according to claim 1, characterized in that, High-strength wires are arranged in the rubber strip body along the length direction to prevent excessive stretching.

3. The military high electromagnetic shielding power supply box of claim 1, wherein, The high-strength wires can be metal wires or high-strength fibers.

4. The military high electromagnetic shielding power supply box according to claim 3, characterized in that, The high-strength wires can be nickel-copper metal wires.

5. The military high electromagnetic shielding power supply box of claim 1, wherein, The rubber strip body is internally provided with cavities along the length direction for elastic deformation in the cross-sectional direction.

6. The military high electromagnetic shielding power supply box according to claim 5, wherein The rubber strip body is made of non-conductive rubber or non-conductive silicone material, and the conductive rubber layer is made of conductive rubber or conductive silicone material.

7. The military high electromagnetic shielding power supply box according to claim 6, wherein ​ 8. The military high electromagnetic shielding power supply box of claim 6, wherein, ​ 9. The military high electromagnetic shielding power supply box of claim 5, wherein, ​ 10. The military high electromagnetic shielding power supply box of claim 5, wherein, ​

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