A cable wall hole sealing and electromagnetic shielding device

Abstract

The present invention relates to a cable wall hole sealing and electromagnetic shielding device, comprising a metal fixing frame, a shielding elastomer, a shielding brush, a metal tube shell, a rubber sealing tube and a clamping nut; the shielding elastomer is clamped in the metal fixing frame, and the metal tube shell is fixed on the shielding elastomer; during installation, the cable is first passed through the shielding elastomer and the metal tube shell, and then the shielding brush and the rubber sealing tube are sequentially sleeved on the cable, and then the shielding brush is positioned at the exposed shielding layer of the cable, and finally the clamping nut is installed and screwed on the metal tube shell. The modular installation method is convenient for disassembly and subsequent maintenance; there is no need to disconnect the cable, and sealing and shielding are directly achieved, so that the effect of cable transmission signal is not affected; good sealing performance and electromagnetic shielding performance are combined together, which can well meet the sealing and electromagnetic shielding needs of the electrical cabinet.

Description

Technical Field

[0001] The invention belongs to the technical field of electronic products and relates to a cable wall hole sealing and electromagnetic shielding device. Background Art

[0002] The cable passing through the wall of the electrical cabinet will cause problems with the sealing and electromagnetic signal interference of the original components inside the electrical cabinet, which is not conducive to the corrosion of the components inside the electrical cabinet by the external harsh environment, and at the same time prevents the external electromagnetic signals from interfering with the work of the internal electrical components. At present, the methods used on the market are difficult to take into account the protection level and electromagnetic shielding effect of the threading position, and have the following defects and shortcomings: 1. The existing technology usually cuts the cable before sealing and shielding, which will affect the effect of cable transmission signal; 2. The sealing and shielding treatment of the existing technology will make it impossible to disassemble the position repeatedly, affecting the subsequent equipment maintenance; 3. The installation method of the existing technology is cumbersome. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a cable wall hole sealing and electromagnetic shielding device with a modular installation method, which is convenient for disassembly and subsequent maintenance; there is no need to disconnect the cable, and sealing and shielding can be achieved directly, which does not affect the effect of cable transmission signals; good sealing performance and electromagnetic shielding performance are combined together, which can well meet the sealing and electromagnetic shielding needs of electrical cabinets.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a cable wall hole sealing and electromagnetic shielding device, including a metal fixing frame, a shielding elastomer, a shielding brush, a metal tube shell, a rubber sealing tube and a clamping nut; the shielding elastomer is clamped in the metal fixing frame, and the metal tube shell is fixed on the shielding elastomer; during installation, the cable is first passed through the shielding elastomer and the metal tube shell, and then the shielding brush and the rubber sealing tube are successively put on the cable, and then the shielding brush is positioned at the exposed shielding layer of the cable, and finally the clamping nut is installed and screwed on the metal tube shell.

[0005] The outer circumferential surface of the metal tube shell is provided with external threads; the metal tube shell is fixed on the shielding elastomer by using an injection molding process.

[0006] The shielding elastic body is provided with a threading hole, and a positioning step ring is provided at the rear end of the threading hole; and snap-fit ​​ear plates are symmetrically provided on both sides of the shielding elastic body.

[0007] The shielding elastomer contains 60% to 80% of rubber and 20% to 30% of metal powder; the metal powder is evenly distributed in the shielding elastomer.

[0008] The metal powder is silver powder or copper powder; the particle size of the metal powder is 0.01 mm to 0.03 mm.

[0009] The outer diameter of the rubber sealing tube is smaller than the inner diameter of the metal tube shell, and the inner diameter of the rubber sealing tube is larger than the outer diameter of the shielding brush.

[0010] The shielding brush comprises a ring body, a contact body and an elastic groove, wherein the contact body is fixed inside the ring body and the elastic grooves are spaced between the contact bodies; the shielding brush contains 60% to 80% rubber and 20% to 30% metal powder; the metal powder is evenly distributed in the shielding brush.

[0011] The shielding brush is made of copper material.

[0012] The front end of the contact body is in an inner arc shape, and both ends of the inner arc are rounded corners of C2mm to C5mm.

[0013] The metal fixing frame includes a base and an upper pressure block, and the upper pressure block is fixed to the base by bolts; the base includes a bottom plate, side plates and vertical clamping plates; the side plates are fixed at both ends of the bottom plate, and the vertical clamping plates are distributed between the side plates; the widths of the side plates and the vertical clamping plates match the spacing of the snap-fit ​​ear plates.

[0014] The side plate is provided with fixing holes for mounting the device on the wall of the electrical cabinet. The wall of the electrical cabinet is provided with corresponding connection holes. Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0015] 1. The combined use of shielding elastomer and shielding brush can lead the interference current generated on the cable through the grounding line of the electrical cabinet, which can solve both the conductive problem and the sealing problem.

[0016] 2. The combination of rubber sealing tube and shielding elastomer further optimizes the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The technical solution of the present invention is further described below in conjunction with the accompanying drawings: Figure 1 It is a schematic diagram of the structure of the invention patent; Figure 2 is a schematic diagram of the contact brush structure; Figure 3 It is a schematic diagram of the outer structure of the shielding elastomer; Figure 4 is a schematic diagram of a cross-sectional structure of a shielding elastomer; Figure 5 This is a schematic diagram of the appearance structure of the metal fixed frame; Figure 6 It is a schematic diagram of the cross-sectional structure after the device is installed.

[0018] In the figure: 1. bolt; 2. upper pressure block; 3. side plate; 4. fixing hole; 5. base; 6. vertical clamping plate; 7. clamping nut; 8. rubber sealing tube; 9. shielding brush; 10. metal tube shell; 11. shielding elastomer; 12. ring body; 13. contact body; 14. elastic groove; 15. inner arc; 16. snap-fit ​​ear plate; 17. positioning step ring; A. electrical cabinet wall; B. cable. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments.

[0020] like Figures 1 to 6 As shown, it includes a metal fixing frame, a shielding elastic body 11, a shielding brush 9, a metal tube shell 10, a rubber sealing tube 8 and a clamping nut 7; the shielding elastic body 11 is engaged in the metal fixing frame, and the metal tube shell 10 is fixed on the shielding elastic body 11; during installation, the cable is first passed through the shielding elastic body 11 and the metal tube shell 10, and then the shielding brush 9 and the rubber sealing tube 8 are sequentially mounted on the cable B, and then the shielding brush 9 is positioned at the exposed shielding layer of the cable B, and finally the clamping nut 7 is installed and screwed on the metal tube shell 10. At this time, the device connects the shielding layer of the cable B with the wall A of the electrical cabinet through the shielding brush 9, the clamping nut 7, the metal tube shell 10 and the shielding elastic body 11 to form a grounding loop (electrical cabinet grounding), and the interference charge formed on the cable B is cleared in time, achieving a good shielding effect.

[0021] At the same time, the rubber sealing tube 8 will be squeezed and deformed by the compression nut 7 during the installation process, and most of its body will enter the coaxial threading hole of the metal tube shell 10 and the shielding elastic body 11, and block the threading hole under the action of pressure (the cable has been inserted at this time). Since the end of the inner cavity is provided with a positioning step ring 17, the rubber sealing tube 8 will form a tighter sealing surface after being contacted and squeezed with the end face of the positioning step ring 17, further improving the sealing effect.

[0022] To achieve the charge conduction effect, such as Figure 4 As shown, the shielding brush 9 is deformed under the direct action of the compression nut 7 so as to be in close contact with the shielding layer of the cable B.

[0023] An external thread is arranged on the outer circumferential surface of the metal tube shell 10; the metal tube shell 10 is fixed on the shielding elastic body 11 by using an injection molding process.

[0024] The shielding elastic body 11 is provided with a threading hole, and a positioning step ring 17 is provided at the rear end of the threading hole; and snap-fit ​​ear plates 16 are symmetrically provided on both sides of the shielding elastic body 11. The snap-fit ​​ear plates 16 are matched with the shielding elastic body 11 for use.

[0025] The shielding elastic body 11 comprises 60% to 80% of rubber and 20% to 30% of metal powder, and the metal powder is evenly distributed in the shielding elastic body 11. This material combination makes the shielding elastic body 11 have certain elasticity and certain conductivity, and takes into account both sealing and conductive (shielding) properties.

[0026] Furthermore, the metal powder is silver powder or copper powder; the particle size of the metal powder is 0.01 mm to 0.03 mm.

[0027] Furthermore, the outer diameter of the rubber sealing tube 8 is smaller than the inner diameter of the metal tube shell 10, so that the rubber sealing tube 8 can easily enter the threading hole; the inner diameter of the rubber sealing tube 8 is larger than the outer diameter of the shielding brush 9, and the rubber sealing tube 8 passes over the shielding brush 9 under the action of the clamping nut 7, thereby making the shielding brush 9 and the clamping nut 7 contact to form a conductive circuit.

[0028] The shielding brush includes a ring body 12, a contact body 13 and an elastic groove 14, the contact body 13 is fixed inside the ring body 12, and the elastic grooves 14 are spaced between the contact bodies 13; the shielding brush 9 contains 60% to 80% rubber and 20% to 30% metal powder; the metal powder is evenly distributed in the shielding brush, and the metal powder is silver powder or copper powder; the particle size of the metal powder is 0.01mm to 0.03mm.

[0029] The contact body 13 can be pressed tightly against the shielding layer of the cable B under pressure. During installation, the outer protective layer of the cable B at the corresponding position needs to be peeled off to expose its own shielding layer.

[0030] The shielding brush 9 can also be made of copper material.

[0031] The front end of the contact body 13 is in the shape of an inner arc, and both ends of the inner arc are rounded with a radius of C2 mm to C5 mm.

[0032] The metal fixing frame includes a base 5 and an upper pressure block 2, and the upper pressure block 2 is fixed to the base 5 by bolts 1; the base 5 includes a bottom plate, side plates 3 and vertical clamping plates 6; the side plates 3 are fixed at both ends of the bottom plate, and the vertical clamping plates 6 are distributed between the side plates 3; the widths of the side plates 3 and the vertical clamping plates 6 match the spacing of the snap-fit ​​ear plates 16.

[0033] The side plate 3 is provided with a fixing hole 4 for mounting the device on the electrical cabinet wall A. The electrical cabinet wall A is provided with a corresponding connection hole. When in use, the cable shielding layer is connected to the shielding brush 9. The cable shielding layer, the shielding brush 9 and the metal fixing frame are all conductive materials and can form an effective grounding with the electrical cabinet. The shielding brush 9 is filled with silver powder and other materials to effectively shield electromagnetic signals. After the shielding brush 9 and the metal fixing frame are assembled as a whole, there is no gap, and the entire incoming line position can effectively shield electromagnetic signals.

[0034] The metal fixing frame can not only conduct electricity but also shield electromagnetic signals. Its structure is detachable, which is convenient for combining the shielding brushes 9 on different cables and also convenient for subsequent replacement of cables without affecting the sealing and shielding effects.

[0035] The shielding elastic body 11 and the metal fixing frame can be interference-fitted to achieve a sealing effect and can shield electromagnetic signals.

[0036] Furthermore, when using, first peel off the outer sheath of the shielded cable B, pass the cable B through the shielding elastomer 11, match the exposed shielding layer and the shielding brush 9, then tighten the cable B with the clamping nut 7, and finally crimp the cable end to the connector that needs to be crimped.

[0037] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A cable wall hole sealing and electromagnetic shielding device, characterized in that: It includes a metal fixing frame, a shielding elastic body, a shielding brush, a metal tube shell, a rubber sealing tube and a compression nut; the shielding elastic body is clamped in the metal fixing frame, and the metal tube shell is fixed on the shielding elastic body; during installation, the cable is first passed through the shielding elastic body and the metal tube shell, and then the shielding brush and the rubber sealing tube are sequentially mounted on the cable, and then the shielding brush is positioned at the exposed shielding layer of the cable, and finally the compression nut is installed and screwed on the metal tube shell; The shielding elastic body is provided with a threading hole, and a positioning step ring is provided at the rear end of the threading hole; and snap-fit ​​ear plates are symmetrically provided on both sides of the shielding elastic body; The metal fixing frame includes a base and an upper pressing block, and the upper pressing block is fixed to the base by bolts; the base includes a bottom plate, side plates and vertical clamping plates; the side plates are fixed to the two ends of the bottom plate, and the vertical clamping plates are distributed between the side plates; the widths of the side plates and the vertical clamping plates match the spacing of the snap-fit ​​ear plates; the side plates are provided with fixing holes for mounting the device on the wall of the electrical cabinet, and the device connects the shielding layer of the cable to the wall of the electrical cabinet through a shielding brush, a clamping nut, a metal tube shell, and a shielding elastomer to form a grounding loop.

2. The cable wall hole sealing and electromagnetic shielding device according to claim 1, characterized in that: The outer circumferential surface of the metal tube shell is provided with external threads; the metal tube shell is fixed on the shielding elastomer by using an injection molding process.

3. The cable wall hole sealing and electromagnetic shielding device according to claim 1, characterized in that: The shielding elastomer contains 60% to 80% of rubber and 20% to 30% of metal powder; the metal powder is evenly distributed in the shielding elastomer.

4. The cable wall hole sealing and electromagnetic shielding device according to claim 3, characterized in that: The metal powder is silver powder or copper powder; the particle size of the metal powder is 0.01 mm to 0.03 mm.

5. The cable wall hole sealing and electromagnetic shielding device according to claim 1, characterized in that : The outer diameter of the rubber sealing tube is smaller than the inner diameter of the metal tube shell, and the inner diameter of the rubber sealing tube is larger than the outer diameter of the shielding brush.

6. The cable wall hole sealing and electromagnetic shielding device according to claim 1, characterized in that :The shielding brush includes a ring body, a contact body and an elastic groove, the contact body is fixed inside the ring body, and the elastic grooves are distributed between the contact bodies at intervals; the shielding brush contains 60% to 80% rubber and 20% to 30% metal powder; the metal powder is evenly distributed in the shielding brush.

7. The cable wall hole sealing and electromagnetic shielding device according to claim 6, characterized in that : The shielding brush is made of copper material; the front end of the contact body is in the shape of an inner arc, and the two ends of the inner arc are fillets of C2mm to C5mm.

Images