Electromagnetic shielding lightweight low-frequency cable assembly and processing technology method thereof

Abstract

The invention belongs to the technical field of electrical interconnection processes, and particularly relates to an electromagnetic shielding lightweight low-frequency cable assembly and a processing process method thereof. The low-frequency cable assembly comprises a low-frequency connector and a plurality of wires, wherein a core wire, an inner insulating sheath and a wire shielding layer are sequentially exposed out of the end part of each wire; the exposed core wire is arranged in a low-frequency connector, and a silk thread is wound and bound in an inner insulating sheath area; a flexible shielding braided sleeve outgoing line is placed in a wire shielding layer closing-up area, and a flexible shielding braided sleeve is wound and bound at the wire shielding layer closing-up position; the low-frequency connector is connected with a shielding tail accessory, the wire is sleeved with a wave-proof sleeve, and a pressing ring of the shielding tail accessory presses the wave-proof sleeve. And the flexible shielding braided sleeve outgoing line is folded, wound and bound on the wave-proof sleeve. According to the electromagnetic shielding lightweight low-frequency cable assembly and the processing technology method thereof, the electromagnetic shielding effect of the low-frequency cable assembly can be effectively guaranteed, and the lightweight requirement of the low-frequency cable assembly can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of electrical interconnection technology, and in particular relates to an electromagnetically shielded lightweight low-frequency cable assembly and a processing method thereof. Background Art

[0002] With the widespread application of electronic equipment, low-frequency cable assemblies have been widely used in aerospace, electronic information and other communication and control fields. However, low-frequency cable assemblies are susceptible to external electromagnetic interference during signal transmission, which affects the stability and accuracy of signal transmission. Therefore, low-frequency cable assemblies need to be effectively electromagnetically shielded to reduce the impact of external electromagnetic interference on signal transmission.

[0003] The principle of electromagnetic shielding is to reduce the propagation and interference of electromagnetic waves inside the component through mechanisms such as reflection, absorption and isolation, so as to ensure its normal operation. For low-frequency cable components, the electromagnetic shielding treatment method is mainly to achieve reflection and isolation through shielding materials. Through shielding materials with good conductivity, an isolation area is formed inside the low-frequency cable component. When electromagnetic waves encounter shielding materials with good conductivity, the electromagnetic waves are reflected by the shielding materials and it is difficult to penetrate the shielding materials. The electromagnetic waves are confined to a specific area, and the interior of the low-frequency cable component is effectively protected from interference from external electromagnetic waves. At the same time, it also prevents the internal electromagnetic waves from spreading to the surrounding space and affecting other cable components or equipment.

[0004] The shielding treatment method for low-frequency cable assemblies is generally to put a metal shielding material on the outside of the cable. The length of low-frequency cable assemblies is usually several meters to tens of meters or even hundreds of meters. This method will greatly increase the weight of the cable, making it difficult to install and maintain, and cannot meet the development needs of the equipment. Gu Yichang of the Shanghai Satellite Equipment Research Institute invented the "Electromagnetic Shielding Method for Satellite Cables CN103687463B", which uses electromagnetic wave shielding fabric materials to cover the low-frequency electrical connectors and cable bundles as a whole through pasting and molding. By reducing the redundancy of the sheathing, it can play a certain role in reducing weight, but it is very limited. At the same time, this method is similar to the overall sheathing method. Its operation process is relatively cumbersome, maintenance is difficult, and the cost is high. It is not suitable for large-scale production and use. Therefore, the current mainstream method for electromagnetic shielding treatment of low-frequency cable assemblies is still to cover the shielding material on the outside of the cable as a whole, and there is no innovative and mature method for application.

[0005] The electromagnetic shielding treatment method of covering the entire exterior of low-frequency cable assemblies with shielding materials has problems such as heavy weight, difficult process control, and unsatisfactory electromagnetic shielding effect, which makes it difficult to meet the needs of modern electronic equipment for high performance, lightweight, and miniaturization. Therefore, how to ensure the electromagnetic shielding effect of low-frequency cable assemblies while achieving the lightweight requirements of low-frequency cable assemblies has become an urgent problem to be solved. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide an electromagnetically shielded lightweight low-frequency cable assembly and a processing method thereof, which can effectively ensure the electromagnetic shielding effect of the low-frequency cable assembly and achieve the lightweight requirements of the low-frequency cable assembly.

[0007] The technical solution adopted by the present invention is:

[0008] A lightweight low-frequency cable assembly with electromagnetic shielding comprises a low-frequency connector and a plurality of conductors, wherein the ends of the conductors are stripped of outer insulating sheaths to expose the core wire, inner insulating sheath and conductor shielding layer in sequence; the exposed core wire of the conductor is installed in the low-frequency connector, and a silk thread is wound and tied along the axial direction of the low-frequency connector in the exposed inner insulating sheath area; a flexible shielding braided sleeve lead-out wire is placed in the closing area of ​​the conductor shielding layer, and a flexible shielding braided sleeve is wound and tied along the axial direction of the low-frequency connector at the closing position of the conductor shielding layer; a shielding tail accessory is connected to one end of the low-frequency connector facing the conductor, a wave-proof sleeve is provided on the conductor, and a pressure ring of the shielding tail accessory presses the wave-proof sleeve; the flexible shielding braided sleeve lead-out wire passes through the tail end of the wave-proof sleeve, and one end of the flexible shielding braided sleeve lead-out wire extending out of the wave-proof sleeve is folded and wound and tied on the wave-proof sleeve.

[0009] The present invention divides the original overall electromagnetic shielding area of ​​the low-frequency cable assembly into a small area at the tail of the low-frequency connector and a wire shielding layer area. The small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately and then effectively connected. The present invention not only achieves electromagnetic shielding effectiveness through the shielding treatment of multiple interfaces, but also avoids the entire low-frequency cable assembly from being covered with a wave-proof sleeve, thereby greatly reducing the weight of the low-frequency cable assembly. At the same time, the present invention is simple to operate and low in cost, and is suitable for large-scale production and use.

[0010] As a preferred solution of the present invention, the direction of the lead-out wire of the flexible shielding braided sleeve is toward the opposite direction of the low-frequency connector.

[0011] As a preferred solution of the present invention, the winding and binding width of the flexible shielding braided sleeve is not less than the diameter of the wound wire harness, and the flexible shielding braided sleeve is dense and has no overlap.

[0012] As a preferred solution of the present invention, the wave-proof sleeve is inserted along the length direction of the wire and covers the threaded joint of the low-frequency connector.

[0013] As a preferred solution of the present invention, the wire clamp portion of the shielding tail accessory is tightened, and the lead wire of the flexible shielding braided sleeve is in complete contact with the wave-proof sleeve.

[0014] As a preferred solution of the present invention, the winding and binding width of the flexible shielding braided sleeve lead-out wire on the wave-proof sleeve is 1 to 1.5 times the outer diameter of the wound wire harness.

[0015] As a preferred solution of the present invention, the winding layer formed by the lead wires of the flexible shielding braided sleeve is tight and flat without overlap.

[0016] A processing method for a lightweight electromagnetic shielding low-frequency cable assembly comprises the following steps:

[0017] S1: Electromagnetic shielding area division: The original overall electromagnetic shielding area of ​​the low-frequency cable assembly is divided into a small area at the tail of the low-frequency connector and a wire shielding layer area. The small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately.

[0018] S2: Shielding of a small area at the tail of a low-frequency connector: Using a low-frequency connector, shielding tail accessories, wave-proof sleeves, and flexible shielding braided sleeves, effective electrical continuity of the connection interface in a small area at the tail of the low-frequency connector is achieved to achieve electromagnetic shielding in a small area at the tail of the connector;

[0019] S3: The small area at the tail of the low-frequency connector is connected to the wire shielding layer area: the lead wire of the flexible shielding braided sleeve passes through the tail end of the wave-proof sleeve, is folded, wrapped and tied to the wave-proof sleeve.

[0020] As a preferred embodiment of the present invention, step S2 is specifically:

[0021] S21: Strip off the outer insulation sheath of the wire to expose the core wire, inner insulation sheath and wire shielding layer;

[0022] S22: several wires are installed into the low-frequency connector, and all the wires are straightened and closed; silk threads are used to wrap and bind the inner insulating sheath area of ​​the wires along the axis direction of the low-frequency connector to form a bundle;

[0023] S23: placing the lead wire of the flexible shielding braided sleeve in the closing area of ​​the wire shielding layer, with the direction of the lead wire of the flexible shielding braided sleeve facing the opposite direction of the connector;

[0024] S24: Use a flexible shielding braided sleeve to wrap and bind the shielding layer of the wire along the axis of the low-frequency connector at the closing position of the wire shielding layer. The wrapping width should not be less than the wire harness diameter, and the wrapping layer should be dense and without overlap. When wrapping, the shielded wire harness should be tied and gathered into a bundle simultaneously.

[0025] S25: Put the anti-wave sleeve along the length direction of the wire and cover the threaded joint of the low-frequency connector;

[0026] S26: Use the pressure ring of the shielding tail accessory to press the anti-wave sleeve, and tighten the wire clamp part of the shielding tail accessory, while ensuring that the lead wire of the flexible shielding braided sleeve is in complete contact with the anti-wave sleeve.

[0027] As a preferred embodiment of the present invention, in step S3, the winding and binding width of the lead wires of the flexible shielding braided sleeve is 1 to 1.5 times the outer diameter of the wound wire harness.

[0028] The beneficial effects of the present invention are:

[0029] The present invention divides the original overall electromagnetic shielding area of ​​the low-frequency cable assembly into a small area at the tail of the low-frequency connector and a wire shielding layer area. The small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately and then effectively connected. The present invention not only achieves electromagnetic shielding effectiveness through the shielding treatment of multiple interfaces, but also avoids the entire low-frequency cable assembly from being covered with a wave-proof sleeve, thereby greatly reducing the weight of the low-frequency cable assembly. At the same time, the present invention is simple to operate and low in cost, and is suitable for large-scale production and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the electromagnetic shielding area segmentation method;

[0031] Figure 2 This is a schematic diagram of the shielding method for a small area at the tail of a low-frequency connector;

[0032] Figure 3 It is a schematic diagram of the processing of a single wire;

[0033] Figure 4 It is a schematic diagram of the processing of multiple wires into bundles;

[0034] Figure 5 It is a schematic diagram of the processing of the flexible shielding braided sleeve and the wire shielding layer;

[0035] Figure 6 This is a schematic diagram of the low-frequency connector and wave-proof sleeve processing;

[0036] Figure 7 It is a schematic diagram of the connection between the small area at the tail of the low-frequency connector and the shielding layer area of ​​the wire.

[0037] In the figure: 1- low frequency connector; 2- conductor; 3- silk thread; 4- flexible shielding braided sleeve lead wire; 5- flexible shielding braided sleeve; 6- shielding tail accessory; 7- wave-proof sleeve; 21- core wire; 22- inner insulating sheath; 23- conductor shielding layer; 24- outer insulating sheath. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0040] like Figure 1 to Figure 7 As shown, the electromagnetic shielding lightweight low-frequency cable assembly of this embodiment includes a low-frequency connector 1 and a plurality of conductors 2, the ends of the conductors 2 are peeled back the outer insulating sheath 24 and the core wire 21, the inner insulating sheath 22 and the conductor shielding layer 23 are exposed in sequence; the exposed core wire 21 of the conductor 2 is installed in the low-frequency connector 1, and the silk thread 3 is wound and tied along the axial direction of the low-frequency connector 1 in the exposed inner insulating sheath 22 area; a flexible shielding braided sleeve lead-out wire 4 is placed in the closing area of ​​the conductor shielding layer 23, and a flexible shielding braided sleeve 5 is wound and tied along the axial direction of the low-frequency connector 1 at the closing position of the conductor shielding layer 23; a shielding tail accessory 6 is connected to one end of the low-frequency connector 1 toward the conductor 2, and a wave-proof sleeve 7 is provided on the conductor 2, and the pressure ring of the shielding tail accessory 6 presses the wave-proof sleeve 7; the flexible shielding braided sleeve lead-out wire 4 passes through the tail end of the wave-proof sleeve 7, and the end of the flexible shielding braided sleeve lead-out wire 4 extending out of the wave-proof sleeve 7 is folded and wrapped and tied on the wave-proof sleeve 7.

[0041] The present invention divides the original overall electromagnetic shielding area of ​​the low-frequency cable assembly into a small area at the tail of the low-frequency connector and a wire shielding layer area. The small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately and then effectively connected. The present invention not only achieves electromagnetic shielding effectiveness through the shielding treatment of multiple interfaces, but also avoids the entire low-frequency cable assembly from being sheathed with a wave-proof sleeve 7, thereby greatly reducing the weight of the low-frequency cable assembly. At the same time, the present invention is simple to operate and low in cost, and is suitable for large-scale production and use.

[0042] The direction of the flexible shielding braided sleeve lead wire 4 is in the opposite direction of the low-frequency connector 1 .

[0043] The winding and binding width of the flexible shielding braided sleeve 5 is not less than the diameter of the wound wire harness, and the flexible shielding braided sleeve 5 is dense and has no overlap.

[0044] The anti-wave sleeve 7 is inserted along the length direction of the wire 2 and covers the threaded joint of the low-frequency connector 1 .

[0045] The wire clamp part of the shielding tail accessory 6 is tightened, and the flexible shielding braided sleeve lead wire 4 is in complete contact with the wave-proof sleeve 7.

[0046] The wrapping and binding width of the flexible shielding braided sleeve lead-out wire 4 on the wave-proof sleeve 7 is 1 to 1.5 times the outer diameter of the wrapped wire harness.

[0047] The winding layer formed by the flexible shielding braided sleeve lead wire 4 is tight and flat without overlap.

[0048] The processing method of the electromagnetic shielding lightweight low-frequency cable assembly of this embodiment includes the following steps:

[0049] S1: Figure 1 As shown, the electromagnetic shielding area is divided: the original overall electromagnetic shielding area of ​​the low-frequency cable assembly is divided into a small area at the tail of the low-frequency connector and a wire shielding layer area, and the small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately;

[0050] S2: Figure 2 As shown, the small area of ​​the tail of the low-frequency connector is shielded: the low-frequency connector 1, the shielding tail accessory 6, the wave-proof sleeve 7, and the flexible shielding braided sleeve 5 are used to achieve effective electrical continuity of the connection interface in the small area of ​​the tail of the low-frequency connector, thereby realizing electromagnetic shielding in the small area of ​​the tail of the connector;

[0051] S21: Figure 3 As shown, the outer insulating sheath 24 of the conductor 2 is stripped to expose the core wire 21, the inner insulating sheath 22 and the conductor shielding layer 23;

[0052] S22: Figure 4 As shown, several wires 2 are installed into the low-frequency connector 1, and all the wires 2 are straightened and closed; a silk thread 3 is used to wrap and bind the inner insulating sheath 22 area of ​​the wire 2 along the axial direction of the low-frequency connector 1 to gather into a bundle;

[0053] S23: Figure 5 As shown, the flexible shielding braided sleeve lead wire 4 is placed in the closing area of ​​the wire shielding layer 23, and the direction of the flexible shielding braided sleeve lead wire 4 is facing the opposite direction of the connector;

[0054] S24: Figure 5 As shown, a flexible shielding braided sleeve 5 is used to wrap and bind the wire shielding layer 23 at the closing position along the axial direction of the low-frequency connector 1. The wrapping and binding width is not less than the wire harness diameter, and the wrapping layer is dense and has no overlap. When wrapping, the shielded wire 2 harness is simultaneously tied and gathered into a bundle.

[0055] S25: Figure 6 As shown, the wave-proof sleeve 7 is inserted along the length direction of the wire 2 and covers the threaded joint of the low-frequency connector 1;

[0056] S26: Figure 6 As shown, the wave-proof sleeve 7 is pressed with the pressure ring of the shielding tail accessory 6, and the wire clamp part of the shielding tail accessory 6 is tightened, while ensuring that the flexible shielding braided sleeve lead wire 4 is in complete contact with the wave-proof sleeve 7;

[0057] S3: Figure 7 As shown, a small area at the tail of the low-frequency connector is connected to the conductor shielding layer area: the lead-out wire 4 of the flexible shielding braided sleeve passes through the tail end of the wave-proof sleeve 7, is folded, wrapped and tied on the wave-proof sleeve 7; the wrapping and binding width of the lead-out wire 4 of the flexible shielding braided sleeve is 1 to 1.5 times the outer diameter of the wrapped wire harness; the wrapping layer is tight and flat without overlap, and the metal wire of the wire harness cannot be exposed from the wrapping layer after the wave-proof sleeve 7 is folded.

[0058] The present invention is not limited to the above-mentioned optional implementation modes. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that fall within the scope defined by the claims of the present invention fall within the protection scope of the present invention.

Claims

1. An electromagnetically shielded lightweight low-frequency cable assembly, characterized in that: The invention comprises a low-frequency connector (1) and a plurality of conductors (2); the ends of the conductors (2) are stripped of an outer insulating sheath (24) to expose a core wire (21), an inner insulating sheath (22) and a conductor shielding layer (23) in sequence; the exposed core wire (21) of the conductor (2) is inserted into the low-frequency connector (1); a wire (3) is wound and tied around the exposed inner insulating sheath (22) along the axial direction of the low-frequency connector (1); a flexible shielding braided sleeve lead-out wire (4) is placed in the closing area of ​​the conductor shielding layer (23); (23) A flexible shielding braided sleeve (5) is wrapped and tied at the closing position along the axial direction of the low-frequency connector (1); a shielding tail accessory (6) is connected to one end of the low-frequency connector (1) facing the wire (2), a wave-proof sleeve (7) is provided on the wire (2), and a pressure ring of the shielding tail accessory (6) presses the wave-proof sleeve (7); the lead wire (4) of the flexible shielding braided sleeve passes through the tail end of the wave-proof sleeve (7), and one end of the lead wire (4) of the flexible shielding braided sleeve extending out of the wave-proof sleeve (7) is folded and wrapped and tied on the wave-proof sleeve (7).

2. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The direction of the flexible shielding braided sleeve lead wire (4) is toward the opposite direction of the low-frequency connector (1).

3. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The winding and binding width of the flexible shielding braided sleeve (5) is not less than the diameter of the wound wire harness, and the flexible shielding braided sleeve (5) is dense and has no overlap.

4. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The wave-proof sleeve (7) is inserted along the length direction of the conductor (2) and covers the threaded joint of the low-frequency connector (1).

5. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The wire clamp part of the shielding tail accessory (6) is tightened, and the flexible shielding braided sleeve lead wire (4) is in complete contact with the wave-proof sleeve (7).

6. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The wrapping and binding width of the flexible shielding braided sleeve lead-out wire (4) on the wave-proof sleeve (7) is 1 to 1.5 times the outer diameter of the wrapped wire harness.

7. The electromagnetic shielding lightweight low-frequency cable assembly according to claim 1, characterized in that: The winding layer formed by the flexible shielding braided sleeve lead wire (4) is tight and flat without overlap.

8. A processing method for an electromagnetic shielding lightweight low-frequency cable assembly, used for manufacturing an electromagnetic shielding lightweight low-frequency cable assembly as claimed in claim 1, characterized in that: The following steps are involved: S1: Electromagnetic shielding area division: The original overall electromagnetic shielding area of ​​the low-frequency cable assembly is divided into a small area at the tail of the low-frequency connector and a wire shielding layer area. The small area at the tail of the low-frequency connector and the wire shielding layer area are shielded separately. S2: Shielding of a small area at the tail of a low-frequency connector: Using a low-frequency connector (1), a shielding tail accessory (6), a wave-proof sleeve (7), and a flexible shielding braided sleeve (5), effective electrical continuity of the connection interface in a small area at the tail of the low-frequency connector is achieved to achieve electromagnetic shielding in a small area at the tail of the connector; S3: The small area at the tail of the low-frequency connector is connected to the conductor shielding layer area: the flexible shielding braided sleeve lead wire (4) passes through the tail end of the wave-proof sleeve (7), is folded, wrapped and tied to the wave-proof sleeve (7).

9. The processing method of a lightweight electromagnetic shielding low-frequency cable assembly according to claim 8, characterized in that: Step S2 is specifically as follows: S21: stripping off the outer insulating sheath (24) of the conductor (2) to expose the core wire (21), the inner insulating sheath (22) and the conductor shielding layer (23); S22: inserting a plurality of conductors (2) into the low-frequency connector (1), and straightening and closing all the conductors (2); using a silk thread (3) to wrap and bind the inner insulating sheath (22) of the conductors (2) along the axis direction of the low-frequency connector (1) to form a bundle; S23: placing the flexible shielding braided sleeve lead wire (4) in the closing area of ​​the wire shielding layer (23), with the flexible shielding braided sleeve lead wire (4) facing the opposite direction of the connector; S24: Using a flexible shielding braided sleeve (5), wrapping and binding at the closing position of the wire shielding layer (23) along the axial direction of the low-frequency connector (1), the wrapping and binding width is not less than the wire bundle diameter, and the wrapping layers are dense and have no overlap; while wrapping, the shielded wire (2) wire bundle is simultaneously bound and closed to form a bundle; S25: inserting the wave-proof sleeve (7) along the length direction of the conductor (2) and covering the threaded joint of the low-frequency connector (1); S26: Use the pressure ring of the shielding tail accessory (6) to press the wave-proof sleeve (7), and tighten the wire clamp part of the shielding tail accessory (6), while ensuring that the flexible shielding braided sleeve lead wire (4) is in complete contact with the wave-proof sleeve (7).

10. The processing method of a lightweight electromagnetic shielding low-frequency cable assembly according to claim 8, characterized in that: In step S3, the flexible shielding braided sleeve lead wire (4) is wound and bound to a width of 1 to 1.5 times the outer diameter of the wound wire harness.

Images