High-reliability shielding cable type filter

Abstract

The utility model discloses a high-reliability shielding cable type filter, which comprises a filter shell, a filter element, a shielding shell, a shielding type output cable and a crimping sleeve, the filter element is arranged in the filter shell, the shielding type output cable comprises a shielding net, an insulating sheath and a lead from outside to inside, the shielding shell is provided with crimping convex columns, and the crimping convex columns are arranged on the shielding shell. The crimping protruding column is provided with a crimping through hole, the crimping sleeve is arranged in the crimping through hole, the insulating sheath penetrates through the crimping sleeve, and the shielding net is located between the outer wall of the crimping sleeve and the inner wall of the crimping protruding column. The end, close to the filter shell, of the crimping sleeve is riveted to form a riveting part, the riveting part enables the end of the shielding net to abut against the corresponding inner wall of the filter shell, and the connecting portion between the wire and the filter element and the filter element are fixedly sealed in the filter shell through epoxy resin. According to the utility model, the connection parts between the whole filter and the cable are all in an efficient shielding state, and the signal shielding effect of the filter is obviously improved.

Description

Technical Field

[0001] This utility model relates to a filter with signal shielding function, and more particularly to a high-reliability shielded cable filter. Background Technology

[0002] A filter has a built-in filtering circuit (most commonly a filtering circuit composed of capacitors, inductors and / or resistors, the simplest of which only requires a filtering capacitor) to effectively filter out a specific frequency point or frequencies other than that in a power line or signal line, so as to obtain an electrical signal of a specific frequency, or to eliminate an electrical signal of a specific frequency.

[0003] To achieve better signal shielding, it is often necessary to add signal shielding structures to filters. For example, shielded cables with a shielding mesh (also known as a wave shield) are used at the output end. This type of traditional filter has a tail accessory at the output end, which clamps the wires of the shielded cable and grounds the shielding mesh. This type of traditional filter has the following drawbacks: the tail accessory is usually directly clamped to the output cable, which always leaves gaps and poses a risk of electromagnetic signal leakage. Moreover, the contact reliability between the shielding mesh and the shielding shell is insufficient, making it difficult to achieve a satisfactory shielding effect. Utility Model Content

[0004] The purpose of this invention is to provide a highly reliable shielded cable filter with better shielding effect in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A high-reliability shielded cable filter includes a filter housing, a filter element, a shielding housing, and a shielded output cable. The filter element is housed within the filter housing, and the shielding housing is connected to the filter housing. The shielded output cable includes, from the outside in, a shielding mesh, an insulating sheath, and a conductor. The conductor is connected to the output end of the filter element, and the shielding mesh of the shielded output cable is connected to the shielding housing. The high-reliability shielded cable filter also includes a crimping sleeve. A protruding crimping protrusion is provided at one end of the shielding housing away from the filter housing. The crimping protrusion has a crimping through-hole communicating with the inner cavity of the shielding housing. A section of the through-hole wall away from the filter housing thins from the inside out, and the portion of the crimping protrusion corresponding to this thinning area forms a protrusion thinner section. The crimping sleeve is placed inside the crimping through hole with both having the same axis. The insulating sheath passes through the central through hole of the crimping sleeve. The outer wall of the crimping sleeve near the filter housing is thinned to form a thin-walled section of the sleeve. The shielding mesh is located between the outer wall of the crimping sleeve and the inner wall of the crimping protrusion. The section of the crimping sleeve away from the filter housing is located within the thin-walled section of the protrusion. The section of the crimping protrusion near the filter housing is located within the thin-walled section of the sleeve. The end of the thin-walled section of the sleeve near the filter housing is riveted to form a riveted part, and the riveted part presses the end of the shielding mesh against the corresponding inner wall of the filter housing. The connection between the wire and the output end of the filter element and the filter element are both sealed in the filter housing with epoxy resin.

[0007] Preferably, in order to achieve filtering and signal shielding functions for multiple conductors, the high-reliability shielded cable filter includes multiple shielded output cables that correspond one-to-one with each other, multiple crimping protrusions and multiple crimping sleeves. The filtering element includes plate-type filter capacitors and contacts. The multiple contacts pass through the central through holes of the multiple plate-type filter capacitors and are in close contact. The conductors of the multiple shielded output cables are respectively welded to the output ends of the multiple contacts.

[0008] Preferably, in order to achieve a better sealing effect between the shielding shell and the shielded output cable, each of the shielding meshes is covered with a braided protective sleeve, and each of the crimping protrusions is close to the corresponding braided protective sleeve and is covered with heat shrink tubing in that area.

[0009] Preferably, in order to facilitate quick and reliable connection between the shielding housing and the filter housing, the shielding housing has a protruding shielding housing flange at one end near the filter housing, and the filter housing has a protruding filter housing flange at one end near the shielding housing. The shielding housing flange and the filter housing flange are connected by connecting bolts and connecting nuts.

[0010] The beneficial effects of this utility model are as follows:

[0011] This invention utilizes a crimping sleeve inside a shielding shell and crimping protrusions on the shielding shell. The steps formed by the matching thinning structure between the crimping sleeve and the crimping protrusions, along with the riveting part of the crimping sleeve, firmly and reliably press the shielding mesh onto the inner wall of the shielding shell. This significantly improves the contact reliability between the shielding mesh and the shielding shell. Simultaneously, the connection points between the wires and the output ends of the filter elements, as well as the filter elements themselves, are all sealed within the filter shell using epoxy resin. This ensures that all connections between the filter and the cable are under highly efficient shielding, significantly improving the signal shielding effect of the filter and enhancing the equipment's anti-interference capability. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the main structure of the high-reliability shielded cable filter described in this utility model;

[0013] Figure 2 This is a schematic diagram of the front cross-sectional structure of the high-reliability shielded cable filter described in this utility model, with a viewing angle of... Figure 1 same. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings:

[0015] like Figure 1 and Figure 2As shown, the high-reliability shielded cable filter of this utility model includes a filter housing 8, a filter element, a shielding housing 5, a shielded output cable, and a crimping sleeve 10. The filter element is placed inside the filter housing 8, and the shielding housing 5 is connected to the filter housing 8. The shielded output cable includes, from the outside to the inside, a shielding mesh 2, an insulating sheath 1, and a conductor 15. The conductor 15 (more specifically, the core of the conductor 15) is connected to the output end of the filter element. The shielding mesh 2 of the shielded output cable is connected to the shielding housing 5. A protruding crimping protrusion 12 is provided at one end of the shielding housing 5 away from the filter housing 8. A crimping through hole (not marked in the figure) communicating with the inner cavity of the shielding housing 5 is provided in the middle of the crimping protrusion 12. A section of the wall of the crimping through hole away from the filter housing 8 thins from the inside out, and the crimping protrusion 12 corresponds to this thinning area. The portion of the crimping sleeve 12 forms a thin-walled section 11 with a protruding column. The crimping sleeve 10 is placed inside the crimping through hole and the two are axially aligned. The insulating sleeve 1 passes through the central through hole of the crimping sleeve 10. The outer wall of the crimping sleeve 10 near the filter housing 8 is thinned to form a thin-walled section 13. The shielding mesh 2 is located between the outer wall of the crimping sleeve 10 and the inner wall of the crimping protrusion 12. The portion of the crimping sleeve 10 away from the filter housing 8 is located inside the thin-walled section 11 with the protruding column. The portion of the crimping protrusion 12 near the filter housing 8 is located inside the thin-walled section 13. The end of the thin-walled section 13 near the filter housing 8 is riveted to form a riveted part 14, and the riveted part 14 presses the end of the shielding mesh 2 against the corresponding inner wall of the filter housing 8. The connection between the wire 15 and the output end of the filter element and the filter element are both sealed in the filter housing 8 with epoxy resin 18.

[0016] like Figure 1 and Figure 2 As shown, this utility model also discloses the following more optimized specific structures:

[0017] To achieve filtering and signal shielding functions for multiple conductors 15, the high-reliability shielded cable filter includes multiple shielded output cables that correspond one-to-one with each other, multiple crimping protrusions 12, and multiple crimping sleeves 10. The filtering element includes plate-type filter capacitors 16 and contacts 17. Multiple contacts 17 pass through the central through holes of multiple plate-type filter capacitors 16 and are in close contact. The conductors 15 (more specifically, the cores of the conductors 15) of the multiple shielded output cables are respectively soldered to the output ends of the multiple contacts 17.

[0018] To achieve a better sealing effect between the shielding shell 5 and the shielded output cable, each shielding mesh 2 is covered with a braided protective sleeve 3, and each crimping protrusion 12 is close to the corresponding braided protective sleeve 3 and is covered with heat shrink tubing 4 in this area.

[0019] To facilitate quick and reliable connection between the shielding housing 5 and the filter housing 8, the shielding housing 5 has a protruding shielding housing flange (not marked in the figure) at one end near the filter housing 8, and the filter housing 8 has a protruding filter housing flange (not marked in the figure) at one end near the shielding housing 5. The shielding housing flange and the filter housing flange are connected by connecting bolts 6 and connecting nuts 7.

[0020] Figure 1 and Figure 2 The diagram also shows multiple input wires 9 corresponding one-to-one with the multiple output wires 15. The multiple input wires 9 (more specifically, the cores of the input wires 9) are respectively welded to the corresponding ends of multiple contacts 17, and the connection points are located within the epoxy resin 18.

[0021] like Figure 1 and Figure 2 As shown, during assembly, multiple crimping sleeves 10 are first fitted over the corresponding insulating sheaths 1, and the corresponding shielding mesh 2 is expanded to cover the crimping sleeves 10. The braided protective sleeves 3 overlapping with the crimping sleeves 10 are cut off. Then, the thin-walled section 13 of the sleeve and the outer shielding mesh 2 are passed through the crimping through holes of the corresponding crimping protrusions 12. The end of the thin-walled section 13 of the sleeve is then riveted using a conventional riveting tool to form a riveted part 14. The riveted part 14 is used to press the corresponding shielding mesh 2 and the inner wall of the crimping protrusion 12 together to form a very stable and reliable connection. Then, each crimping sleeve 10 is assembled with a 14-folded riveting part 14. Heat shrink tubing 4 is wrapped around the area where the protruding post 12 and the corresponding braided protective sleeve 3 are close to each other; then all the plate filter capacitors 16 and contacts 17 are connected, then all the wires 15 are soldered to the corresponding contacts 17, and all the input wires 9 are soldered to the corresponding contacts 17. Then the assembled plate filter capacitors 16 and contacts 17 are placed inside the filter housing 8, and then epoxy resin 18 is filled to complete the sealing; finally, the shielding housing flange and the filter housing flange are firmly connected by connecting bolts 6 and connecting nuts 7 (the connecting bolts 6 are also fitted with flat washers and spring washers), thus completing the assembly of the entire filter.

[0022] In use, connect the multiple input wires 9 to the cables that need to be filtered or use them directly as the cables that need to be filtered. Connect the multiple wires 15 to the electrical equipment that needs to be connected after filtering. This will achieve efficient signal shielding while completing the filtering function.

[0023] Note: In the diagram, the section of each shielded output cable furthest from the shielding outer shell should actually have a tight fit between the shielding mesh and the insulating sheath. The shielding mesh outside the crimped sleeve is artificially expanded to cover the crimped sleeve. However, for ease of visual representation, the shielding mesh, braided protective sleeve, and heat shrink tubing are all presented as straight tubes in the diagram, which differs slightly from the actual mid-bend structure. Additionally, Figure 2 The insulating sheath 1 and wire 15 are not shown in cross-section, but only to better illustrate the product structure.

[0024] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A high-reliability shielded cable filter, comprising a filter housing, a filter element, a shielding housing, and a shielded output cable, wherein the filter element is disposed within the filter housing, the shielding housing is connected to the filter housing, the shielded output cable comprises, from the outside to the inside, a shielding mesh, an insulating sheath, and a conductor, the conductor being connected to the output end of the filter element, and the shielding mesh of the shielded output cable being connected to the shielding housing, characterized in that: The high-reliability shielded cable filter also includes a crimp sleeve. The shielding housing has a protruding crimping protrusion at one end away from the filter housing. The crimping protrusion has a crimping through-hole communicating with the inner cavity of the shielding housing. A section of the through-hole wall away from the filter housing thins from the inside out, and the portion of the crimping protrusion corresponding to this thinned area forms a thin-walled section. The crimp sleeve is placed inside the crimping through-hole, and both are axially aligned. The insulating sheath passes through the central through-hole of the crimp sleeve. A section of the outer wall of the crimp sleeve near the filter housing is thinned to form a sleeve. The tube has a thin-walled section, with the shielding mesh located between the outer wall of the crimped sleeve and the inner wall of the crimping protrusion. A section of the crimped sleeve away from the filter housing is located within the thin-walled section of the protrusion, and a section of the crimping protrusion near the filter housing is located within the thin-walled section of the sleeve. The end of the thin-walled section of the sleeve near the filter housing is riveted to form a riveted portion, which presses the end of the shielding mesh against the corresponding inner wall of the filter housing. The connection between the wire and the output end of the filter element, as well as the filter element itself, are all sealed within the filter housing using epoxy resin.

2. The high-reliability shielded cable filter according to claim 1, characterized in that: The high-reliability shielded cable filter includes multiple shielded output cables that correspond one-to-one with each other, multiple crimping protrusions and multiple crimping sleeves. The filter element includes plate-type filter capacitors and contacts. The multiple contacts pass through the central through holes of the multiple plate-type filter capacitors and are in close contact. The conductors of the multiple shielded output cables are respectively welded to the output ends of the multiple contacts.

3. The high-reliability shielded cable filter according to claim 1 or 2, characterized in that: Each of the shielding meshes is covered with a braided protective sleeve, and each of the crimping protrusions is close to the corresponding braided protective sleeve and is covered with heat shrink tubing in that area.

4. The high-reliability shielded cable filter according to claim 1 or 2, characterized in that: The shielding housing has a protruding shielding housing flange at one end near the filter housing, and the filter housing has a protruding filter housing flange at one end near the shielding housing. The shielding housing flange and the filter housing flange are connected by connecting bolts and connecting nuts.

Images