Ground box wire entry clamp

Abstract

This utility model discloses a grounding box inlet clamp, comprising a fixed base, a movable clamping block, and a locking bolt. The fixed base is mounted on an insulating plate and has an arc-shaped mounting groove. A locking platform and a guide block are provided on the mounting groove, and a screw hole is provided on the locking platform. The movable clamping block has a limiting groove opposite to the mounting groove. Raised ridges are spaced apart on the inner edges of the limiting groove and the mounting groove. A guide groove adapted to the guide block is provided at the end of the movable clamping block. This utility model improves the clamp by providing a movable clamping block and a fixed base on the insulating plate, and by improving the mounting groove and limiting groove that contact the cable, by providing wavy raised ridges inside. This creates a corrugated toothed contact between the cable and the mounting groove and limiting groove, increasing the contact area between the movable clamp / fixed base and the wire core, thereby reducing contact resistance, improving current carrying capacity, and preventing thermal annealing that could affect stability.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage grounding technology, and more specifically, to a grounding box inlet clamp. Background Technology

[0002] A cable grounding box is used for the protective grounding of the cable sheath. It is a specialized device to protect the cable sheath and prevent damage from lightning strikes and induced overvoltages. The cable grounding box contains connecting copper busbars, copper terminals, clamps, and the cable sheath itself.

[0003] In existing cable grounding boxes, the cable is inserted into the clamp and fixed with bolts. However, traditional ordinary clamps have an effective contact area of ​​less than 30% between the cable and the clamp, and the measured contact resistance is 52-75μΩ. This results in insufficient current carrying capacity, making the cable prone to thermal breakage under short-circuit current impact. When the voltage is overloaded, the cable's load-bearing capacity is limited, and the outer sheath insulation of the cable is easily broken down, causing multiple grounding faults in the cable's metal sheath and affecting the normal operation of the power cable.

[0004] Therefore, it is necessary to propose a grounding box inlet clamp to solve the above-mentioned technical problems. Utility Model Content

[0005] This utility model provides a grounding box inlet clamp to solve the technical problem that insufficient contact area between the cable and the clamp at the wiring point of the existing grounding box leads to increased contact resistance and easy thermal breakage.

[0006] According to one aspect of this utility model, a grounding box inlet clamp is provided, which is installed on the insulating plate of the grounding box for locking the connection of the grounding box cable. The grounding box inlet clamp includes a fixed base, a movable clamping block, and a locking bolt. The fixed base is installed on the insulating plate and has an arc-shaped mounting groove. A locking platform and a guide block are provided on the mounting groove. A screw hole is provided on the locking platform. The movable clamping block has a limiting groove opposite to the mounting groove. The inner edges of the limiting groove and the mounting groove are provided with protruding ridges at intervals. The end of the movable clamping block has a guide groove adapted to the guide block. A locking hole opposite to the screw hole is provided on the movable clamping block and opposite to the locking platform. The locking bolt passes through the locking hole and is inserted into the screw hole.

[0007] Preferably, based on the above scheme, the cross-section of the protruding ridge is arc-shaped.

[0008] Preferably, based on the above scheme, a protrusion is provided in the middle of the mounting groove, and the two end faces of the protrusion form a limiting edge.

[0009] Based on the above scheme, preferably, the movable clamping block is a copper block with a tin-plated surface, and the fixed base is a copper base with a tin-plated surface.

[0010] Based on the above scheme, preferably, the cross-section of the protruding ridge is arc-shaped, and the radius of curvature of the protruding ridge is 0.95 to 1.05 times the radius of the cable core.

[0011] This utility model discloses a grounding box inlet clamp. By improving the clamp, a movable clamping block and a fixed seat are set on the insulating plate. The mounting groove and limiting groove that contact the cable are improved by setting wavy protrusions inside them. This makes the cable form a corrugated tooth pair contact after contacting the mounting groove and limiting groove, thereby increasing the contact area between the movable clamp and the fixed seat and the wire core, reducing contact resistance, improving current carrying capacity, and avoiding thermal annealing that affects its stability. Attached Figure Description

[0012] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0013] Figure 1 This is a schematic diagram of the grounding box inlet of this utility model;

[0014] Figure 2 This is an exploded view of the grounding box inlet clamp of this utility model.

[0015] Figure 3 This is a schematic diagram of the installation of the grounding box inlet clamp of this utility model;

[0016] Explanation of icon numbers:

[0017] 1. Grounding box; 2. Insulating board;

[0018] 30. Fixed base; 31. Mounting groove; 32. Locking platform; 33. Guide block; 34. Screw hole; 40. Movable clamping block; 41. Limiting groove; 42. Protruding ridge; 43. Guide groove; 44. Locking hole; 45. Protrusion; 50. Locking bolt. Detailed Implementation

[0019] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0020] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0021] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0022] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0023] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0026] Please see Figure 1 and combined Figure 2 and Figure 3 As shown, the present invention provides a grounding box 1 inlet clamp, which is installed on the insulating plate 2 of the grounding box 1 and used for locking the connection of the grounding box 1 cable. The grounding box 1 inlet clamp includes a fixed base 30, a movable clamping block 40 and a locking bolt 50. The fixed base 30 is installed on the insulating plate 2 to provide an installation base, while the locking bolt 50 acts on the movable clamping block 40 to achieve the purpose of assembling and locking the movable clamping block 40 and the fixed base 30.

[0027] like Figure 2 As shown, this utility model is designed to connect 6 cables to the grounding box 1. They have the same structure. For ease of explanation, the following will take the installation of one of the fixed seats 30 and the movable clamp 40 as an example for detailed explanation.

[0028] The fixing base 30 of this utility model is installed on the insulating plate 2, and the fixing base 30 is provided with an arc-shaped mounting groove 31. A locking platform 32 and a guide block 33 are provided on the mounting groove 31. In this embodiment, the locking platform 32 is designed on the upper part of the mounting groove 31, and the guide block 33 is located on the upper part of the locking platform 32. Of course, depending on actual needs, it is not excluded that the locking platform 32 and the guide block 33 are placed on the lower part of the mounting groove 31, or the locking platform 32 and the guide block 33 are designed on both sides of the mounting groove 31.

[0029] Specifically, the locking platform 32 of this utility model is provided with a screw hole 34; the movable clamping block is provided with a limiting groove 41 that is opposite to the mounting groove 31, the inner edge surfaces of the limiting groove 41 and the mounting groove 31 are provided with protruding ridges 42 at intervals, the end of the movable clamping block 40 is provided with a guide groove 43 that is adapted to the guide block 33, and a locking hole 44 that is opposite to the screw hole 34 is provided at the position where the movable clamping block 40 is opposite to the locking platform 32, and the locking bolt 50 passes through the locking hole 44 and is inserted into the screw hole 34.

[0030] In use, the battery core of the cable 6 to be inserted is pressed into the mounting groove 31 and the guide groove 43. By tightening the locking bolt 50, the protruding rib 42 in the mounting groove 31 and the guide groove 43 comes into contact with the battery core of the cable 6 to increase the contact area. In order to ensure the contact effect and heat dissipation effect, the cross section of the protruding rib 42 of this utility model adopts an arc structure. At the same time, the movable clamping block 40 is a copper block with a tin-plated surface, and the fixed seat 30 is a copper seat with a tin-plated surface.

[0031] The mounting groove 31 of this utility model has a protrusion 45 in the middle. The two end faces of the protrusion 45 form a limiting edge. The limiting edge abuts against the outer sheath of the cable 6. The core of the cable 6 is clamped in the mounting groove 31 and the limiting groove 41. The gap between the protrusions 42 forms a ventilation and heat dissipation channel to reduce the heat generated during the power-on process. Furthermore, the cross-section of the protrusion 42 is arc-shaped, and the radius of curvature of the protrusion 42 is 0.95 to 1.05 times the radius of the cable 6 core to improve the current carrying capacity.

[0032] This utility model discloses a grounding box 1 inlet clamp. By improving the clamp, a movable clamping block 40 and a fixed seat 30 are set on the insulating plate 2. The mounting groove 31 and the limiting groove 41 that contact the cable 6 are improved by setting a wavy protrusion 42 inside them. This makes the cable 6 form a corrugated tooth pair contact after contacting the mounting groove 31 and the limiting groove 41. This increases the contact area between the movable clamp and the fixed seat 30 and the wire core, thereby reducing the contact resistance, improving the current carrying capacity, and avoiding thermal annealing that affects its stability.

[0033] Compared with the prior art, the grounding box 1 inlet clamp of this utility model has the following advantages:

[0034] Large contact area and low contact resistance: The convex ridges 42 on the inner edge of the mounting groove 31 and the limiting groove 41 form a wave-shaped toothed contact structure that fits tightly with the surface of the cable core 6, significantly increasing the contact area, reducing contact resistance, reducing heat generation during current flow, and avoiding "thermal tempering" that affects stability.

[0035] Stable clamping: The cooperation between the guide block 33 and the guide groove 43 ensures the precise relative position of the movable clamping block 40 and the fixed seat 30, and the clamping force can be applied evenly when the locking bolt 50 is tightened; the protrusion 45 and the limiting edge in the middle of the mounting groove 31 can further restrict the axial movement of the cable 6 and improve the clamping reliability.

[0036] Excellent conductivity: The movable clamp 40 and the fixed base 30 are made of copper and tin-plated. Copper has excellent conductivity, and the tin plating layer can prevent oxidation and corrosion, ensuring long-term stable conductivity.

[0037] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A grounding box inlet clamp, mounted on the insulating plate of the grounding box, for locking the grounding box cable, characterized in that, The grounding box inlet clamp includes a fixed base, a movable clamping block, and a locking bolt. The fixed base is mounted on the insulating plate and has an arc-shaped mounting groove. A locking platform and a guide block are provided on the mounting groove, and a screw hole is provided on the locking platform. The movable clamping block has a limiting groove opposite to the mounting groove. The inner edges of the limiting groove and the mounting groove are provided with protruding ridges at intervals. The end of the movable clamping block has a guide groove that matches the guide block. A locking hole opposite to the screw hole is provided on the movable clamping block and opposite to the locking platform. The locking bolt passes through the locking hole and is inserted into the screw hole.

2. The grounding box inlet clamp as described in claim 1, characterized in that, The cross-section of the protruding ridge is arc-shaped.

3. The grounding box inlet clamp as described in claim 1, characterized in that, A protrusion is provided in the middle of the mounting groove, and the two end faces of the protrusion form limiting edges.

4. The grounding box inlet clamp as described in claim 1, characterized in that, The movable clamping block is a copper block with a tin-plated surface, and the fixed base is a copper base with a tin-plated surface.

5. A grounding box inlet clamp as described in claim 1, characterized in that, The cross-section of the protruding ridge is arc-shaped, and the radius of curvature of the protruding ridge is 0.95 to 1.05 times the radius of the cable core.

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