Circuit breaker loop resistance test clamp

Abstract

The embodiment of the utility model provides a circuit breaker loop resistance test clamp, and the clamp comprises a test clamp body which is used for fixing a device and is connected with external equipment; the heat insulation protection assembly is arranged in the test clamp main body and is used for blocking heat transfer, and the heat insulation protection assembly is of a multi-layer composite structure so as to optimize heat distribution; the inner wall of the heat insulation protection assembly is of a sawtooth-shaped structure so that the heat conduction path can be prolonged, and the heat insulation protection assembly is of a modular segmented structure so that the convenience of installation and maintenance can be improved. One end of the pressure spring is connected to the test clamp main body, and the other end of the pressure spring is connected with the conductive clamping piece; and the conductive clamping piece is arranged in the test clamp main body, is located at the center of the heat insulation protection assembly, and is used for pressing the wiring terminal of the circuit breaker to be tested so as to realize stable electric contact. Through the scheme of the embodiment of the invention, the durability under the high-temperature extreme working condition can be enhanced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical measurement, in particular to a circuit breaker loop resistance test clamp. BACKGROUND

[0002] The circuit breaker loop resistance test clamp is a special tool for measuring the contact resistance of the main loop of the circuit breaker. It can accurately detect the resistance value by clamping the conductor and stably applying current, providing important data support for power equipment maintenance. However, in high-temperature extreme working conditions, this test clamp may face the problem of insufficient durability, which is manifested in material thermal aging, mechanical performance degradation, or connection stability affected, etc. These problems may restrict its application life and reliability in harsh environments. SUMMARY

[0003] Therefore, the circuit breaker loop resistance test clamp provided by the embodiments of the present application at least partially solves the problems existing in the prior art.

[0004] The circuit breaker loop resistance test clamp provided by the present application comprises:

[0005] A test clamp body for fixing the device and connecting with external equipment;

[0006] A heat insulation protection assembly arranged inside the test clamp body for blocking heat transfer, wherein the heat insulation protection assembly is a multi-layer composite structure to optimize heat distribution, the inner wall of the heat insulation protection assembly is a sawtooth structure to prolong the heat conduction path, and the heat insulation protection assembly is modularized and segmented to improve the convenience of installation and maintenance;

[0007] A compression spring connected to one end of the test clamp body and connected to the other end of the conductive clamp;

[0008] A conductive clamp arranged inside the test clamp body and located at the center of the heat insulation protection assembly, for compressing the terminal of the circuit breaker to be tested to achieve stable electrical contact;

[0009] A fastening bolt assembly arranged above the test clamp body and located outside the conductive clamp for fixing the position of the conductive clamp;

[0010] The conductive clamp is simultaneously pushed by the compression spring and cooperates with the fastening bolt assembly to complete the position adjustment.

[0011] Preferably, the multi-layer composite structure of the heat insulation protection assembly comprises an outer high-temperature resistant layer, an intermediate insulating and heat insulation layer, and an inner reflective heat insulation layer, each layer is combined to form an integrated structure by a high-strength adhesive to enhance the heat blocking effect.

[0012] Preferably, the sawtooth structure of the heat protection assembly has irregular intervals and alternating angles in the range of 30°-60°, thereby increasing the complexity of the heat transfer path.

[0013] Preferably, the modular segmented structure of the heat protection assembly is detachably assembled by a plurality of heat insulation modules through buckle connectors, so that each heat insulation module can be individually replaced and adjusted in position.

[0014] Preferably, the compression spring is connected to the test clamp body through a fixing seat.

[0015] Preferably, the compression spring is externally sleeved with a protective sleeve with elasticity.

[0016] Preferably, the contact end face of the conductive clamp is covered with an anti-corrosion conductive layer.

[0017] Preferably, a heat insulation pressing plate is arranged between the fastening bolt assembly and the conductive clamp, for fixing the position of the conductive clamp and avoiding direct heat conduction to the outside during the fastening process.

[0018] Preferably, the heat protection assembly is fixed inside the test clamp body through a diagonal support frame, so that the heat therein is evenly dispersed.

[0019] The circuit breaker loop resistance test clamp provided by the embodiments of the present disclosure comprises: a test clamp body for fixing a device and connecting with an external device; a heat protection assembly arranged inside the test clamp body for blocking heat transfer, wherein the heat protection assembly is a multi-layer composite structure to optimize heat distribution, the inner wall of the heat protection assembly is a sawtooth structure to lengthen the heat conduction path, and the heat protection assembly is of a modular segmented structure to improve the convenience of installation and maintenance; a compression spring connected to one end of the test clamp body and connected to the other end of the conductive clamp; a conductive clamp arranged inside the test clamp body and located at the center of the heat protection assembly, for compressing the terminal of the circuit breaker to be tested to achieve stable electrical contact; a fastening bolt assembly arranged above the test clamp body and located outside the conductive clamp, for fixing the position of the conductive clamp; and the conductive clamp is simultaneously pushed by the compression spring and adjusted in position in cooperation with the fastening bolt assembly. Through the scheme of the embodiments of the present disclosure, the durability under high-temperature extreme working conditions can be enhanced BRIEF DESCRIPTION OF DRAWINGS

[0020] In the drawings, like reference numerals designate like elements or elements throughout the several views. The drawings are not necessarily to scale. It is to be understood that these drawings only depict some embodiments in accordance with the disclosure and should not be considered to be limiting of the scope of the disclosure.

[0021] Figure 1 is a structural schematic view of the circuit breaker loop resistance test clamp of the utility model;

[0022] Figure 2 is a semi-sectional view of the circuit breaker loop resistance test clamp of the utility model;

[0023] Figure 3 is a structural schematic view of the heat insulation module in the circuit breaker loop resistance test clamp of the utility model;

[0024] Figure 4 is Figure 2 the enlarged schematic view of A of

[0025] Figure 5 is Figure 2 the enlarged schematic view of B of

[0026] In the figure: 1, test clamp main body; 2, heat protection assembly; 3, compression spring; 4, conductive clamping piece; 5, fastening bolt assembly; 6, outer high-temperature-resistant layer; 7, middle insulation heat insulation layer; 8, inner reflective heat insulation layer; 9, buckle connecting piece; 11, fixed seat; 12, protective sleeve; 13, corrosion-resistant conductive layer; 16, heat insulation pressing plate; 17, oblique support frame; 22, sawtooth structure; 23, heat insulation module DETAILED DESCRIPTION

[0027] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0028] The embodiments of the present disclosure will be described in detail below with reference to the drawings.

[0029] As shown in Figure 1 , a circuit breaker loop resistance test clamp of the present application includes a test clamp main body 1, a heat protection assembly 2, a compression spring 3, a conductive clamping piece 4, and a fastening bolt assembly 5. Each component will be described in detail below.

[0030] The test clip body 1 is used for the fixation of the overall device and is connected to the relevant equipment through external structures to achieve positioning and mounting functions. It has a solid mechanical structure, usually made of high-strength alloy materials, capable of resisting the effects of vibration and pressure in the working environment. In actual implementation, effective fixation of the test clip body 1 with other components can be achieved through the design of threaded interfaces or hooks, ensuring stable and reliable operation of the entire device.

[0031] The thermal protection assembly 2 is located inside the test clip body 1 (see Figure 3 for details), and its main function is to prevent heat transfer, thereby improving the performance stability of the device under extreme temperature conditions. This assembly adopts a multi-layer composite structure, where the outer layer can be composed of high-temperature-resistant ceramic fibers to withstand external heat radiation; the middle layer can use thermal insulation foam to further optimize internal heat distribution; and the inner layer is a metal sheet with a sawtooth structure 22, which not only prolongs the heat conduction path but also enhances the heat resistance effect. This modular design also facilitates independent replacement or repair of damaged parts, significantly improving the maintenance efficiency and economy of the device.

[0032] The compression spring 3 is installed at one end inside the test clip body 1 and is connected to the conductive clamp 4 at the other end. Its main function is to provide a certain compression force to the conductive clamp 4, ensuring good electrical contact between the terminal under test and the test device, preventing poor contact due to looseness. Technically, by selecting an appropriate spring stiffness coefficient and accurately adjusting its compression stroke, the conductive clamp 4 can obtain the required clamping force. To accommodate various sizes and materials of the terminal under test, some adjustment parameters can be added to the initial length or free state of the compression spring 3 to improve its versatility.

[0033] The conductive clamp 4 is located inside the test clip body 1 and is at the center of the thermal protection assembly 2, directly acting on the terminal of the circuit breaker under test, forming a stable current conduction path. It is generally made of copper material with high electrical conductivity, and the surface may need to be plated with nickel or tin to reduce oxidation loss problems during long-term use. To achieve good mechanical clamping force, the conductive clamp 4 is usually designed in the form of a clamp or other similar structures, such as designs with arc-shaped teeth grooves, which can be clamped to the terminal surface after applying sufficient compression force, ensuring the quality of electrical contact. In addition, elastic contact structures or ball-type compression mechanisms can be introduced in some special cases to further improve the stability of the contact.

[0034] The fastening bolt assembly 5 is arranged above the test clamp body 1 and distributed around the periphery of the conductive clamp 4, which serves to accurately fix and fine-tune the position of the conductive clamp 4. The assembly generally includes a rotating fastening screw and a corresponding force-bearing flat plate. Users can manually adjust the tightness of the conductive clamp 4 to adapt to different specifications of the test pieces by operating the knob. Technically, this requires designing a standard pitch or fine-tuning pitch screw pair structure on the fastening bolt assembly 5 and considering how to eliminate the deviation caused by friction, such as using lubricating grease or low-friction gaskets.

[0035] The above-mentioned components work together to solve an important technical problem, namely, how to enhance the durability under extreme high-temperature conditions. To solve this problem, the device starts with the specific structure of the heat insulation protection assembly 2, adopts a multi-layer insulation design combined with a modular installation method, effectively reduces the influence of external heat transfer on internal precision parts, and especially ensures that the performance indicators of the test clamp are not disturbed under extreme high temperatures. In addition, by arranging the sawtooth structure 22 on the inner wall, the heat transfer distance is further lengthened, and the accumulation of heat in the core part is reduced. At the same time, due to the modular segmented design, the damaged heat insulation area can be replaced individually without the need to update the entire device, thereby prolonging the overall service life and reducing the user's operation and maintenance costs.

[0036] As shown in Figure 3 In one embodiment, the heat insulation protection assembly 2 of the circuit breaker loop resistance test clamp of the present application adopts a multi-layer composite structure design, including an outer high-temperature resistant layer 6, an intermediate insulating and heat insulation layer 7, and an inner reflective heat insulation layer 8. Each layer of the multi-layer composite structure is composed of a specific material, and the material is reasonably selected to meet the heat resistance requirements under complex working conditions. Among them, the outer high-temperature resistant layer 6 is directly exposed to the external environment and has the ability to resist high-temperature radiation and mechanical wear; the intermediate insulating and heat insulation layer 7 mainly has low thermal conductivity to reduce heat transfer; and the inner reflective heat insulation layer 8 uses the surface high reflection characteristic to reflect most of the heat to the outside. The layers are connected by a high-strength adhesive to form an integrated structure, thereby ensuring the stability of the overall structure and enhancing the blocking effect of heat.

[0037] Specifically, the above-mentioned three-layer structure can be nested and installed in the designated area of the test clamp body 1, and the joint between the layers needs to be uniform and firm to avoid the risk of separation due to stress concentration. For example, reliable multi-layer composite connection can be achieved by pre-treating the material surface, selecting appropriate adhesive curing process, and other technical means. In addition, in order to ensure the consistency of the heat insulation performance, the thickness tolerance and flatness deviation of each layer can be controlled during assembly. Such an installation method not only simplifies the manufacturing process, but also helps to improve the reliability and durability of the final product in actual use.

[0038] AsFigure 3 As shown, in one embodiment, the thermal protection assembly 2 of the circuit breaker loop resistance test clip of the present application adopts an innovative zigzag structure 22 design, in which the zigzag structure 22 has irregular spacing characteristics and is arranged in an alternating manner on the inner wall of the thermal protection assembly 2. By controlling the zigzag angle to be within the range of 30°-60°, this structure can significantly increase the complexity of the heat transfer path, thereby improving the overall thermal insulation performance of the device. The thermal protection assembly 2 is installed inside the test clip main body 1, specifically covering the peripheral area of the conductive clamp 4, while maintaining relative independence between it and the compression spring 3 to avoid interference with the compression function.

[0039] For example, the inner wall with precise zigzag angles and uneven spacing can be formed by precision machining, and the thermal protection assembly 2 can be made of high-temperature resistant materials. When installing such components, the zigzag structure 22 of the inner wall must face the internal heat source completely to ensure the best heat conduction regulation effect. Specifically, the modular segmented structure design of the thermal protection assembly 2 makes it easy to disassemble from the inside of the test clip main body 1, while ensuring that the geometric characteristics of the zigzag structure 22 are consistent.

[0040] As shown, Figures 1-3 In one embodiment, the thermal protection assembly 2 of the circuit breaker loop resistance test clip of the present application adopts a modular segmented structure. This structure is composed of multiple groups of thermal insulation modules 23, and each thermal insulation module 23 is detachably assembled through the buckle connector 9, thereby having good assembly flexibility and maintenance convenience. Specifically, these thermal insulation modules 23 are independent of each other in physical form, but are connected as a whole through the carefully designed buckle connection form, so that each segmented module can be replaced or adjusted in position individually when needed. This modular structure helps to reduce overall maintenance costs and enhance the versatility of the product.

[0041] For example, during actual assembly, a group of thermal insulation modules 23 are first fixed together with adjacent thermal insulation modules 23 through the buckle connector 9, and then other segmented modules are sequentially spliced until the complete thermal protection assembly 2 is formed. The specific structure of the buckle connector 9 includes protrusions and grooves that engage with each other, which are distributed on the edge areas of the modules, thereby ensuring the tight connection and stability between the modules. On this basis, the overall thermal protection assembly 2 can be stably nested inside the test clip main body 1, while not hindering the functional cooperation of other components such as the conductive clamp 4 and the compression spring 3.

[0042] As shown, Figure 4As shown, in one embodiment, the compression spring 3 of the circuit breaker loop resistance test clip of the present application is connected to the test clip body 1 through a fixing seat 11, which is arranged at one side position inside the test clip body 1 and firmly combined with one end of the compression spring 3. The fixing seat 11 is made of high-temperature-resistant material, which can effectively avoid the influence of environmental temperature change on the normal operation of the device under extreme working conditions. Specifically, such high-temperature-resistant material can include but is not limited to alumina ceramic, high-temperature alloy or composite material with similar properties to meet the temperature and electrical requirements in complex working conditions.

[0043] For example, the fixing seat 11 can be integrally formed inside the test clip body 1, or modularly assembled through bolts or buckles, so as to facilitate the later maintenance or replacement operation. At the same time, the other end of the compression spring 3 is connected to the conductive clamp 4 to form an effective thrust transmission link. In this configuration, the compression spring 3 can ensure that the conductive clamp 4 always maintains a certain contact pressure, thereby providing reliable electrical contact conditions for the circuit breaker terminal.

[0044] As shown in Figure 4 and Figure 5 In one embodiment, the compression spring 3 of the circuit breaker loop resistance test clip of the present application is externally provided with an elastic protective sleeve 12 surrounding the outside of the compression spring 3. Through this design, the protective sleeve 12 can effectively protect the compression spring 3 from being eroded or contaminated by external factors such as dust, liquid and other media. In addition, the elastic properties of the protective sleeve 12 itself enable it to adapt to the compression and stretching process of the compression spring 3 to a certain extent, maintaining a relatively stable wrapping state. This installation form does not need to change the existing structure, and the protective sleeve 12 is directly sleeved outside the spring and does not affect the rest of the components.

[0045] Specifically, the protective sleeve 12 is made of flexible and highly elastic material, such as silicone or rubber, one end of which is tightly fitted to the test clip body 1, and the other end extends to the vicinity of the conductive clamp 4. To ensure that the working range of the compression spring 3 is completely within the coverage area of the protective sleeve 12. For example, by selecting appropriate inner diameter size and length specifications, and adjusting the axial position of the protective sleeve 12 during assembly, it can be ensured that it perfectly fits the compression spring 3. In addition, during actual installation, the protective sleeve 12 can be slightly stretched to match the connection points of both ends of the spring, so that the entire component combination is more compact and reliable.

[0046] As shown in Figure 5As shown, in one embodiment, the contact end face of the conductive clamp 4 of the circuit breaker circuit resistance test clamp of this application is covered with an anti-corrosion conductive layer 13. The anti-corrosion conductive layer 13 is made of a specific material and is tightly attached to the contact end face of the conductive clamp 4. This part is in direct contact with the terminal of the circuit breaker under test to reduce the influence of environmental factors on conductivity. This design not only ensures good conductivity but also extends the service life of the equipment under complex operating conditions. The conductive clamp 4 is located at the center of the heat insulation protection assembly 2 and is provided with continuous clamping force by the compression spring 3, so that the conductive clamp 4 always maintains a stable contact state. In addition, when the position of the conductive clamp 4 is adjusted from the outside by the fastening bolt assembly 5, the anti-corrosion conductive layer 13 will not fall off or crack due to uneven force distribution.

[0047] For example, an anti-corrosion conductive layer 13 can be applied to the contact surface of the conductive clamp 4 using vacuum coating or physical vapor deposition processes. Highly conductive materials such as silver plating or nickel plating alloys can be selected for the specific processing, thereby ensuring excellent corrosion resistance and conductivity. This combination of materials and processes can meet the requirements of high-voltage, high-current testing while ensuring structural stability and long-term reliability.

[0048] like Figure 1 and Figure 2 As shown, in one embodiment, the conductive clamping member 4 of the circuit breaker loop resistance test clamp of this application is fixed in position by a fastening bolt assembly 5, and a heat-insulating pressure plate 16 is provided between the two. The function of the heat-insulating pressure plate 16 is to fix the position of the conductive clamping member 4 and prevent the heat generated by the fastening bolt assembly 5 during adjustment and tightening from being directly conducted to the outside. This structure ensures that the temperature characteristics of the test clamp are stable during use and reduces the uncertainty caused by heat transfer.

[0049] The conductive clamp 4 is positioned at the center of the thermal insulation component 2, while the fastening bolt assembly 5 is located on its outer side and connected to the top of the test clamp body 1. A thermal insulation plate 16 is installed at the contact area between the fastening bolt assembly 5 and the conductive clamp 4. Specifically, it is a plate with high thermal insulation properties or a similar structure, directly embedded at the interface between the two. This assembly method ensures that the conductive clamp 4 is reliably fixed while simultaneously preventing heat from diffusing outwards from the fastening operation area. The thermal insulation plate 16 fits tightly against the side components, possibly with a certain amount of pressure to ensure good contact.

[0050] For example, by choosing a thermal insulation material with a lower thermal conductivity to make the thermal insulation plate 16 and placing it accurately on the side where the fastening bolt assembly 5 exerts force, it can ensure that good thermal insulation and fixation can be achieved during actual installation and debugging. At this time, the specific size of the thermal insulation plate 16 will be matched according to the relative position and structure of the conductive clamp 4 and the fastening bolt assembly 5, achieving the functional design requirements while not affecting the spatial arrangement of the entire device.

[0051] As shown in Figure 1 In one embodiment, the thermal protection assembly 2 of the circuit breaker loop resistance test clamp of the present application is fixed inside the test clamp body 1 by the inclined support frame 17 to achieve uniform heat dispersion under high temperature working conditions. Specifically, the thermal protection assembly 2 adopts a multi-layer composite structure design, and the outer material has a lower thermal conductivity, which can effectively block the transfer of heat energy. Inside the test clamp body 1, the thermal protection assembly 2 uses the zigzag structure 22 to extend the heat conduction path, further reducing the heat concentration phenomenon. At the same time, the modular segmented design makes the assembly can be easily disassembled and installed without the support of complex auxiliary tools.

[0052] For example, the thermal protection assembly 2 can be connected by forming stable fixed points with the inner wall of the test clamp body 1 through multiple inclined support frames 17, and combined with appropriate positioning holes to ensure that the thermal protection assembly 2 is in the ideal position. One end of the inclined support frame 17 is embedded in the inner wall of the test clamp body 1, and the other end is in close contact with the thermal protection assembly 2, thereby avoiding the generation of high-temperature hot spots caused by excessive local stress. This installation method ensures the close cooperation between components and the need for uniform heat distribution.

[0053] In actual operation, when the device is in use, the circuit breaker terminal to be tested can be placed in the conductive clamp 4, and stable electrical contact between the conductive clamp 4 and the circuit breaker terminal to be tested is achieved through the compression force provided by the compression spring 3. The test clamp body 1 is used to fix the entire device and realizes the docking with other test equipment through its external connection. The thermal protection assembly 2 can effectively block heat transfer, protect the internal structure under extreme working conditions and optimize heat distribution, and the zigzag structure 22 of the inner wall can extend the heat conduction path, and the modular segmented design helps installation and maintenance convenience. The fastening bolt assembly 5 is used to further fix the position of the conductive clamp 4, ensuring stability and reliability during testing. During the entire operation process, the components work together to finally complete the accurate test of the circuit breaker loop resistance.

[0054] The above specific embodiments further explain the purposes, technical solutions and beneficial effects of the embodiments of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not used to limit the protection scope of the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present disclosure shall be included in the protection scope of the embodiments of the present disclosure.

Claims

1. A circuit breaker loop resistance test clip, comprising: The utility model relates to a test clamp body (1) for fixing device and connecting with external equipment, heat insulation protection assembly (2) is arranged in the test clamp body (1) inside for blocking heat transfer, wherein the heat insulation protection assembly (2) is multilayer composite structure to optimize heat distribution, the inner wall of heat insulation protection assembly (2) is sawtooth structure (22) to extend heat conduction path, heat insulation protection assembly (2) passes through modular segmented structure to improve the convenience of installation and maintenance, compression spring (3) one end is connected to the test clamp body (1), the other end is connected with the electrically conductive holder (4), electrically conductive holder (4) is arranged in the inside of test clamp body (1) and is located the center of heat insulation protection assembly (2), is used for compressing the terminal of the circuit breaker under test to realize stable electric contact, fastening bolt assembly (5) is located the outside of electrically conductive holder (4) and is located above test clamp body (1) and is used for fixing the position of electrically conductive holder (4), electrically conductive holder (4) is pushed by compression spring (3) simultaneously and is adjusted with fastening bolt assembly (5) cooperation to complete position. The multilayer composite structure of the heat insulation protection assembly (2) includes an outer high-temperature-resistant layer (6), an intermediate insulating layer (7), and an inner reflective insulating layer (8), each layer is combined into an integrated structure by a high-strength adhesive to enhance the heat blocking effect. The sawtooth structure (22) of the heat insulation protection assembly (2) has irregular intervals and alternating angles ranging from 30 to 60 degrees, thereby increasing the complexity of the heat transfer path. The modular segmented structure of the heat insulation protection assembly (2) is detachably assembled by a plurality of heat insulation modules (23) through buckle connectors (9), so that each heat insulation module (23) can be replaced and adjusted individually. The compression spring (3) is connected to the test clamp body (1) through a fixing seat (11). The compression spring (3) is externally sleeved with a protective sleeve (12) having elasticity. The contact end face of the electrically conductive holder (4) is covered with an anti-corrosion conductive layer (13).

2. A circuit breaker loop resistance test clip according to claim 1, wherein: The fastening bolt assembly (5) and the electrically conductive holder (4) are provided with a heat insulation pressing plate (16) for fixing the position of the electrically conductive holder (4) and avoiding direct heat conduction to the outside during the fastening process.

3. The circuit breaker loop resistance test clip of claim 1, wherein: The heat insulation protection assembly (2) is fixed inside the test clamp body (1) by a diagonal support frame (17), so that the heat is evenly dispersed.

4. The circuit breaker loop resistance test clip of claim 1, wherein: ​ 5. The circuit breaker loop resistance test clip of claim 1, wherein: ​ 6. The circuit breaker loop resistance test clip of claim 1, wherein: ​ 7. The circuit breaker loop resistance test clip of claim 1, wherein: ​ 8. The circuit breaker loop resistance test clip of claim 1, wherein: ​ 9. The circuit breaker loop resistance test clip of claim 1, wherein: ​

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