A connecting fixture for power frequency withstand voltage testing

Abstract

This utility model belongs to the field of tooling technology, specifically referring to a connection tooling for power frequency withstand voltage testing; it includes: an insulating substrate, one end of which is a hollow nested end, and the other end is a test connection end; a conductive core rod, coaxially disposed within the insulating substrate, with anchoring structures formed by mechanical interlocking with the insulating substrate at axial intervals along the outer periphery of the conductive core rod; wherein, the conductive core rod and the insulating substrate are integrally cast and fixed into a whole. This utility model, through the above technical solution, provides a connection tooling for power frequency withstand voltage testing that eliminates assembly gaps and achieves integration of the insulating and conductive structures.

Description

Technical Field

[0001] This utility model belongs to the field of tooling technology, specifically referring to a connecting tooling for power frequency withstand voltage testing. Background Technology

[0002] The connection fixture used for power frequency withstand voltage testing is a component that enables electrical connection between the test equipment and the test object in high-voltage electrical testing. Its function is to ensure insulation isolation on the high-voltage side while transmitting the test voltage, thereby ensuring the safety of the test process and the validity of the results.

[0003] In existing technologies, common test connection fixtures often employ a split structure, consisting of an insulating sleeve and long bolts. Due to the assembly gap between the insulating sleeve and the bolts, dust and moisture easily accumulate in this gap after prolonged use, which can easily lead to surface flashover under high voltage conditions. Furthermore, the insulating sleeve is prone to displacement or even detachment after repeated insertion and removal, posing a serious risk of electric shock. Therefore, there is an urgent need for a connection fixture that can eliminate assembly gaps and integrate the insulating and conductive structures. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by integrally casting and fixing the conductive core rod and the insulating body into a whole, and setting an anchoring structure on the outer periphery of the conductive core rod to form a mechanical interlock with the insulating body, thereby eliminating assembly gaps and preventing relative displacement.

[0005] The purpose of this utility model is achieved as follows: a connection fixture for power frequency withstand voltage testing, comprising:

[0006] An insulating substrate, one end of which is a hollow nested end, and the other end is a test connection end;

[0007] A conductive core rod is coaxially disposed within the insulating substrate, and the outer periphery of the conductive core rod is provided with anchoring structures that form a mechanical interlock with the insulating substrate at axial intervals.

[0008] The conductive core rod and the insulating substrate are integrally cast and fixed together as a whole.

[0009] The present invention is further configured such that the anchoring structure includes an anchoring groove disposed on the conductive core rod, and an anchoring boss disposed on the insulating substrate and adapted to the anchoring groove.

[0010] The present invention is further configured such that the groove wall of the anchoring groove and the platform wall of the anchoring boss are both inclined surfaces.

[0011] The present invention is further configured such that the portion of the conductive core rod located at the test connection end extends out of the insulating substrate and forms a threaded connection portion, the threaded connection portion being equipped with a locking nut.

[0012] The present invention is further provided with a flared guide structure at the opening of the cavity of the hollow nested end for guiding the conductive core rod to align with the test interface.

[0013] The present invention is further configured such that the flared guide structure is a tapered guide surface, and the tapered guide surface gradually tapers towards the bottom of the cavity along the cavity opening.

[0014] The present invention is further configured such that the insulating substrate is integrally cast from epoxy resin or silicone rubber.

[0015] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0016] 1. By integrally casting the conductive core rod and the insulating substrate and using an anchoring structure, a seamless integrated structure is formed, which improves insulation reliability and safety in use.

[0017] 2. By setting a conical guide surface at the hollow nested end, rapid blind insertion and docking can be achieved, improving the efficiency of test operations.

[0018] 3. By completely covering the conductive core rod with an insulating substrate and smoothly transitioning the inclined surface of the anchoring structure, electric field concentration is avoided, thus improving the accuracy of the test results. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0020] Figure 2 This is a partial cross-sectional schematic diagram of the present invention.

[0021] The figures are labeled as follows: 1. Insulating substrate; 2. Hollow nested end; 3. Test connection end; 4. Conductive core rod; 5. Anchoring structure; 50. Anchoring groove; 51. Anchoring boss; 6. Threaded connection part; 7. Locking nut; 8. Flared guide structure; 80. Conical guide surface. Detailed Implementation

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-2 :

[0023] Example 1:

[0024] This embodiment provides a connection fixture for power frequency withstand voltage testing, including:

[0025] An insulating substrate 1 has a hollow nested end 2 at one end and a test connection end 3 at the other end;

[0026] The conductive core rod 4 is coaxially disposed within the insulating substrate 1, and the outer periphery of the conductive core rod 4 is provided with anchoring structures 5 that form a mechanical interlock with the insulating substrate 1 at axial intervals;

[0027] The conductive core rod 4 and the insulating substrate 1 are integrally cast and fixed together as a whole.

[0028] This connecting fixture adopts an integrated structure and is used to achieve conductive connection and electrical isolation between the test object and the test device during the power frequency withstand voltage test of high-voltage electrical equipment, while ensuring positioning accuracy and structural stability during the assembly process.

[0029] The insulating substrate 1 is the external main structure of the tooling, made of epoxy resin or silicone rubber. Both epoxy resin and silicone rubber have good dielectric insulation properties and integral casting molding properties, which can be adapted to the high-voltage working environment of power frequency withstand voltage test. At the same time, this type of material has good bonding with the conductive core rod 4. After integral casting, it can form a gapless solid connection structure, ensuring the dual reliability of insulation and mechanical connection. The insulating substrate 1 has a rod-like structure, divided into two functional sections along its length. One end is a hollow nested end 2, and the other end is a test connection end 3. The hollow nested end 2 and the test connection end 3 are sequentially distributed along the axial direction of the insulating substrate 1, forming a continuous integral structure. The hollow nested end 2 has a cavity inside to accommodate the mating part of the test object. A flared guide structure 8 is provided at the opening of the cavity. The flared guide structure 8 is constructed as a conical guide surface 80, which gradually tapers from the opening of the cavity to the bottom of the cavity. This guide surface 80 can guide the mating part of the test object into the cavity during assembly, aligning the end of the conductive core rod 4 with the test interface of the test object. The internal space of the cavity of the hollow nested end 2 is adapted to the shape of the mating part of the test object, enabling a nested fit and insertion positioning. The bottom of the cavity of the hollow nested end 2 is flush with the end of the conductive core rod 4, allowing the mating part of the test object to directly contact the end of the conductive core rod 4 after insertion into the cavity, forming a stable conductive path and avoiding poor conductivity caused by contact position deviation.

[0030] The radial dimension of the hollow nested end 2 is larger than that of the test connection end 3, so that the insulating substrate 1 forms a stepped rod-like structure. The hollow nested end 2 with a larger radial dimension can adapt to the docking seat structure of the test object, providing sufficient space for nesting and mating. At the same time, the stepped structure can ensure the overall mechanical strength of the insulating substrate 1.

[0031] The conductive core rod 4 is coaxially arranged inside the insulating substrate 1 along its axial direction. The conductive core rod 4 is a long, strip-shaped conductive component made of conductive metal, possessing excellent conductivity, and is used to form a conduction path for the test voltage. Anchoring structures 5 are spaced axially along the outer periphery of the conductive core rod 4. Each anchoring structure 5 includes an anchoring groove 50 on the outer periphery of the conductive core rod 4 and an anchoring boss 51 formed inside the insulating substrate 1 and adapted to the anchoring groove 50. Both the groove wall of the anchoring groove 50 and the platform wall of the anchoring boss 51 are constructed as inclined surfaces. The anchoring groove 50 and the anchoring boss 51 interlock with each other to form a mechanical interlocking relationship, preventing the conductive core rod 4 from axially moving or rotating circumferentially relative to the insulating substrate 1. The conductive core rod 4 and the insulating substrate 1 are integrated into an inseparable whole through an integral casting process. During casting, the material of the insulating substrate 1 fills the interior of the anchoring groove 50 and solidifies to form the anchoring boss 51, ensuring a stable interlocking state between the anchoring boss 51 and the anchoring groove 50. The inclined surface structure causes the anchoring groove 50 and the anchoring boss 51 to generate radial component force when subjected to axial tension, further enhancing the tightness of the fit.

[0032] The walls of the anchoring groove 50 and the anchoring boss 51 of the anchoring structure 5 are both inclined surfaces, which eliminates the angular structure at the junction of the conductive core rod 4 and the insulating substrate 1. At the same time, the insulating substrate 1 fully encloses the conductive core rod 4, with no conductive parts exposed. The combination of the two structurally eliminates the point of electric field concentration, thereby avoiding electric field concentration.

[0033] The conductive core rod 4 extends from the end face of the insulating substrate 1 toward the test connection end 3, and forms a threaded connection part 6 at the protruding part. The outer circumferential surface of the threaded connection part 6 has a continuous thread structure. A locking nut 7 is provided for the threaded connection part 6. The locking nut 7 and the threaded connection part 6 are screwed together to connect the fixture to the external test device and maintain a stable connection. After the locking nut 7 is screwed on, it abuts against the end face of the insulating substrate 1, keeping the connection between the threaded connection part 6 and the test device in a compressed state. An elastic washer is also provided between the locking nut 7 and the terminal of the test device. The elastic washer remains compressed after the locking nut 7 is tightened, continuously providing axial preload.

[0034] During operation, the hollow nested end 2 is moved toward the test object. With the guidance of the flared guide structure 8, the mating part of the test object enters the cavity of the hollow nested end 2 to achieve plug-in mating. At this time, the end of the conductive core rod 4 is aligned with the test interface of the test object. Then, the threaded connection part 6 is connected to the external test device and the locking nut 7 is tightened to complete the assembly of the tooling and the test device. The power frequency voltage output by the test device is transmitted to the conductive core rod 4 through the threaded connection part 6, and then transmitted to the test object by the conductive core rod 4. The insulating substrate 1 is wrapped around the outside of the conductive core rod 4 to form an electrical isolation barrier, preventing the high voltage part from directly contacting the external environment. The anchoring structure 5 maintains the relative position stability between the conductive core rod 4 and the insulating substrate 1 through the interlocking anchoring grooves 50 and anchoring bosses 51, preventing loosening or displacement during use, thereby ensuring the continuity of the conductive path and the reliability of the insulation isolation.

[0035] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A connecting tool for a power frequency voltage withstand test, characterized by, include: An insulating substrate (1) has a hollow nested end (2) at one end and a test connection end (3) at the other end. The conductive core rod (4) is coaxially disposed within the insulating substrate (1), and the outer periphery of the conductive core rod (4) is provided with an anchoring structure (5) that forms a mechanical interlock with the insulating substrate (1) at axial intervals. The conductive core rod (4) and the insulating substrate (1) are integrally cast and fixed together as a whole.

2. The connecting tool for power frequency voltage withstand test according to claim 1, characterized in that, The anchoring structure (5) includes an anchoring groove (50) provided on the conductive core rod (4) and an anchoring boss (51) provided on the insulating substrate (1) and adapted to the anchoring groove (50).

3. The connecting tool for power frequency voltage withstanding test according to claim 2, characterized in that, The groove wall of the anchoring groove (50) and the platform wall of the anchoring boss (51) are both inclined surfaces.

4. The connecting tool for power frequency voltage withstanding test according to claim 1, characterized in that, The portion of the conductive core rod (4) located at the test connection end (3) extends out of the insulating substrate (1) and forms a threaded connection (6), which is equipped with a lock nut (7).

5. The connecting tool for power frequency voltage withstanding test according to claim 1, characterized in that, The hollow nested end (2) has a flared guide structure (8) at the cavity opening for guiding the conductive core rod (4) to align with the test interface.

6. The connection tool for power frequency voltage proof test according to claim 5, characterized in that, The flared guide structure (8) is a tapered guide surface (80), which gradually tapers towards the bottom of the chamber along the opening of the chamber.

7. The connecting tool for power frequency voltage withstanding test according to claim 1, characterized in that, The insulating substrate (1) is integrally cast from epoxy resin or silicone rubber.

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