Low resistance insulating bushing

Abstract

The utility model discloses a kind of low-resistance insulating bushings, the low-resistance insulating bushings include insulating tube, integrated structure's conducting core, the insulating tube is connected fixed by injection molding with conducting core, the conducting core is equipped with connecting hole, the inner wall of the conducting core is equipped with scalable compression plate, the both sides of the connecting hole are equipped with fastening screw, the fastening screw is pivotally arranged in compression plate. Through integrated conducting core, realize continuous electrically conductive channel, reduce contact interface, reduce loop resistance, reduce partial discharge;When conducting core is connected with vacuum circuit breaker conducting rod, by fastening screw driving compression plate to exert pre-tightening force, ensure that both connection is stable, enhance mechanical fastening, improve connection stability, the design simplifies manufacturing process, reduces manufacturing cost, reduces assembly error.

Description

Technical Field

[0001] This utility model relates to the field of insulating sleeve technology, and in particular to a low-resistance insulating sleeve. Background Technology

[0002] As an important component of vacuum circuit breakers, the structural design of insulating bushings directly affects the electrical performance and operational reliability of the equipment.

[0003] In existing technologies, the conductive core of the insulating sleeve is composed of multiple conductive units, which are electrically connected to each other via threads. This structure suffers from complex assembly processes and a large number of connection points, leading to an increase in contact interfaces, increased contact circuit resistance, and a higher susceptibility to partial discharge.

[0004] Furthermore, during equipment operation, vibration may be transmitted to the connection between the insulating bushing and the vacuum circuit breaker, causing slight relative displacement or loosening at the connection interface. Under long-term or high-frequency vibration conditions, fretting wear and fatigue relaxation will occur at the contact interface, reducing the mechanical stability of the connection and leading to poor contact or loosening. Therefore, the applicant has made beneficial designs and found a solution to the above problems. The technical solution described below was developed in this context. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the traditional insulating sleeve design and to provide a product with low circuit resistance, low manufacturing cost, and stable connection.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A low-resistance insulating sleeve includes an insulating tube and an integrated conductive core. The insulating tube is connected and fixed to the conductive core by injection molding. The conductive core has a connection hole. The inner wall of the conductive core has a retractable clamping plate. Fastening screws are provided on both sides of the connection hole. The fastening screws are pivotally mounted on the clamping plate.

[0008] Preferably, the outer wall of the insulating tube is provided with a plurality of equally spaced umbrella skirts from top to bottom.

[0009] Preferably, the outer wall of the insulating tube is provided with an expansion portion, which is located below the last umbrella skirt, and the outer wall of the expansion portion is provided with a plurality of equally spaced protrusions from top to bottom.

[0010] Preferably, the conductive core has a connecting portion, and the connecting portion has at least one mounting hole.

[0011] Preferably, the inner wall of the connecting hole is provided with a groove for accommodating the clamping plate, the groove is provided with a threaded hole, and the outside of the threaded hole is provided with a countersunk hole.

[0012] Preferably, the fastening screw is threaded into a threaded hole, and the outer wall of the shank of the fastening screw near the end is provided with a relief groove.

[0013] Preferably, the pressing plate is provided with an abutting part, and a first groove and a second groove with an opening are stacked on the upper and lower sides of the back of the pressing plate. The first groove abuts against the shank of the fastening screw, and the second groove abuts against the relief groove.

[0014] Preferably, plugs are provided at the entrances of the first groove and the second groove.

[0015] Beneficial effects:

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] This invention employs an integrated conductive core structure to achieve continuity of the conductive channel, eliminating the segmented connection links between multiple conductive units and reducing the number of contact interfaces. This design lowers the contact circuit resistance and reduces the possibility of partial discharge. Furthermore, after the conductive rod of the vacuum circuit breaker is assembled with the connection hole, rotating the fastening screw drives the clamping plate to apply radial preload to the conductive rod, ensuring a tight connection with the conductive core. This structure enhances the mechanical fastening between the conductive rod and the conductive core, improves the stability of the connection interface, and helps maintain a long-term reliable electrical connection. At the same time, the integrated structure simplifies the manufacturing process, reduces manufacturing costs, and reduces assembly errors caused by the large number of connection parts. Attached Figure Description

[0018] Figure 1 This is a side cross-sectional view of a low-resistance insulating sleeve according to the present invention.

[0019] Figure 2 This utility model Figure 1 A partial enlarged view A of a low-resistance insulating bushing;

[0020] Figure 3 This is an exploded structural diagram of a low-resistance insulating sleeve according to the present invention.

[0021] The correspondence between the labels and component names in the attached figures is as follows:

[0022] Reference numerals: 1. Insulating tube; 2. Conductive core; 3. Pressing plate; 4. Fastening screw; 5. Plug; 11. Umbrella skirt; 12. Expansion part; 13. Protrusion; 21. Connecting hole; 22. Connecting part; 23. Mounting hole; 24. Groove; 25. Threaded hole; 26. Countersunk hole; 31. Abutting part; 32. First groove; 33. Second groove; 41. Relief groove. Detailed Implementation

[0023] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In this embodiment of the utility model, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0026] Reference example Figures 1 to 3 A low-resistance insulating sleeve includes an insulating tube 1 and an integrated conductive core 2. The insulating tube 1 is connected and fixed to the conductive core 2 by injection molding. The conductive core 2 is provided with a connection hole 21. The inner wall of the conductive core 2 is provided with a retractable clamping plate 3. Fastening screws 4 are provided on both sides of the connection hole 21. The fastening screws 4 are pivotally mounted on the clamping plate 3.

[0027] The integrated conductive core 2 achieves continuity of the conductive channel, eliminating the segmented connection links between multiple conductive units and reducing the number of contact interfaces. This design reduces the contact circuit resistance and the possibility of partial discharge. Furthermore, after the conductive rod of the vacuum circuit breaker is assembled with the connection hole 21, rotating the fastening screw 4 drives the clamping plate 3 to apply radial preload to the conductive rod, ensuring a tight connection with the conductive core 2. This structure enhances the mechanical fastening between the conductive rod and the conductive core 2, improves the stability of the connection interface, and helps maintain a long-term reliable electrical connection. Simultaneously, the integrated structure simplifies the manufacturing process, reduces manufacturing costs, and minimizes assembly errors caused by the large number of connection points 22.

[0028] It is worth mentioning that the outer wall of the insulating tube 1 is provided with several equally spaced umbrella skirts 11 from top to bottom. The umbrella skirts 11 are designed to extend the leakage path of the current on the surface of the insulating sleeve and increase the distance required for the current to flow from the high voltage conductor to the grounding part. This can effectively improve the insulation level of the insulating sleeve and prevent the occurrence of surface flashover. Flashover refers to the arc discharge formed by the current passing through the insulating surface, which may lead to equipment failure.

[0029] It is worth mentioning that the outer wall of the insulating tube 1 is provided with an expansion portion 12, which is located below the last umbrella skirt 11. The outer wall of the expansion portion 12 is provided with several equally spaced protrusions 13 from top to bottom. The expansion portion 12 and the protrusions 13 further extend the leakage path of the current and increase the creepage distance of the current.

[0030] It is worth mentioning that the conductive core 2 is provided with a connecting part 22, and the connecting part 22 is provided with at least one mounting hole 23. The integrated conductive core 2 can be made by stamping or casting. The conductive core 2 is provided with mounting holes 23 for establishing electrical connections with external electrical equipment.

[0031] It is worth mentioning that the inner wall of the connecting hole 21 is provided with a groove 24 for accommodating the clamping plate 3. The groove 24 is provided with a threaded hole 25, and the outside of the threaded hole 25 is provided with a countersunk hole 26. After the clamping plate 3 is assembled with the fastening screw 4, the clamping plate 3 is always in the groove 24 to avoid interfering with the conductive rod entering the connecting hole 21. The countersunk hole 26 limits the distance that the fastening screw 4 drives the clamping plate 3 to move.

[0032] It is worth mentioning that the fastening screw 4 is threaded into the threaded hole 25, and the outer wall of the shank of the fastening screw 4 near the end is provided with a relief groove 41;

[0033] It is worth mentioning that the clamping plate 3 is provided with an abutment part 31. The back of the clamping plate 3 is stacked with a first groove 32 and a second groove 33 with openings. The first groove 32 abuts against the shank of the fastening screw 4, and the second groove 33 abuts against the relief groove 41. The shape of the abutment part 3 is designed to conform to the shape of the conductive rod, thereby increasing the contact area and friction between the two. The connection between the clamping plate 3 and the fastening screw 4 is automated, which effectively reduces the assembly cost of this part. Specifically, the fastening screw 4 is first screwed into the threaded hole 25 and abuts against the countersunk hole 26, so that the shank of the fastening screw 4 is close to the axis of the connecting hole 21. The pneumatic gripper aligns the first groove 32 and the second groove 33 with the fastening screw 4. The pneumatic gripper pushes the clamping plate 3 into the fastening screw 4. By strictly controlling the dimensional tolerances of the first groove 32 and the second groove 33, it ensures that the fastening screw 4 fits tightly with the groove wall. The fastening screw 4 is rotated to adjust the direction of the entrance of the first groove 32 and the second groove 33 and face the entrance of the connecting hole 21. Then, the support cylinder goes into the connecting hole 21 and clamps the clamping plate 3 to provide support. The pressing cylinder presses the block into the first groove 32 and the second groove 33. Then, the fastening screw 4 rotates and moves away from the end face of the countersunk hole 26. The servo motor drives the support cylinder to follow the movement of the clamping plate 3 until the clamping plate 3 partially enters the groove 24. Then, the support cylinder resets and leaves the connecting hole 21.

[0034] It is worth mentioning that plugs 5 are provided at the entrances of the first groove 32 and the second groove 33. The plugs 5 prevent the fastening screws 4 from disengaging from the connection of the pressure plate 3.

[0035] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present utility model. It should not be construed that the specific implementation of the present utility model is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present utility model, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted by the present utility model.

Claims

1. A low-resistance insulating sleeve, comprising an insulating tube (1) and an integrally structured conductive core (2), wherein the insulating tube (1) is connected and fixed to the conductive core (2) by injection molding, characterized in that: The conductive core (2) is provided with a connection hole (21), and the inner wall of the conductive core (2) is provided with a retractable clamping plate (3). Fastening screws (4) are provided on both sides of the connection hole (21), and the fastening screws (4) are pivotally mounted on the clamping plate (3).

2. The low-resistance insulating sleeve according to claim 1, characterized in that: The outer wall of the insulating tube (1) is provided with several equally spaced umbrella skirts (11) from top to bottom.

3. The low-resistance insulating sleeve according to claim 2, characterized in that: The outer wall of the insulating tube (1) is provided with an expansion portion (12) and is located below the last umbrella skirt (11). The outer wall of the expansion portion (12) is provided with a number of equally spaced protrusions (13) from top to bottom.

4. The low-resistance insulating sleeve according to claim 1, characterized in that: The conductive core (2) is provided with a connecting part (22), and the connecting part (22) is provided with at least one mounting hole (23).

5. The low-resistance insulating sleeve according to claim 1, characterized in that: The inner wall of the connecting hole (21) is provided with a groove (24) for accommodating the pressing plate (3), the groove (24) is provided with a threaded hole (25), and the outside of the threaded hole (25) is provided with a countersunk hole (26).

6. The low-resistance insulating sleeve according to claim 5, characterized in that: The fastening screw (4) is threaded into the threaded hole (25), and the outer wall of the shank of the fastening screw (4) near the end is provided with a relief groove (41).

7. The low-resistance insulating sleeve according to claim 6, characterized in that: The pressing plate (3) is provided with an abutting part (31). The back of the pressing plate (3) is provided with a first groove (32) and a second groove (33) with openings stacked on top of each other. The first groove (32) abuts against the rod of the fastening screw (4), and the second groove (33) abuts against the relief groove (41).

8. The low-resistance insulating sleeve according to claim 7, characterized in that: A plug (5) is provided at the entrance of the first groove (32) and the second groove (33).

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