High-voltage device main power cable crimping terminal structure

Abstract

The utility model relates to a kind of crimping structure for the cable and connecting end in the main power loop of high-voltage device (such as frequency converter, energy storage converter, high-voltage power supply etc.), belong to high-voltage electrical equipment manufacturing technical field.A kind of high-voltage device main power cable crimping terminal structure, its structure includes terminal main body, cable conductor pressing plate;Terminal main body is U-shaped groove, its radius matches conductor radius, and guide groove is set in the opposite position of U-shaped groove inner surface, guide groove extends along the length direction of U-shaped groove and is close to U-shaped groove mouth;The two sides of cable conductor pressing plate are inserted into guide groove, so as to constrain conductor in terminal main body.The utility model has the following advantages: solve the problem of traditional crimping process consistency and safety hazard;Crimping quality is stable, contact resistance is low, and tensile strength is high.

Description

Technical Field

[0001] This utility model relates to a crimping structure for cables and connection ends in the main power circuit of high-voltage devices (such as frequency converters, energy storage converters, high-voltage power supplies, etc.), and belongs to the field of high-voltage electrical equipment manufacturing technology. Background Technology

[0002] The following problems exist in the cables and connections of the main power circuits of existing high-voltage devices (such as frequency converters, energy storage converters, high-voltage power supplies, etc.): 1) Electrical performance defects: Under high voltage and high current scenarios, traditional crimping is prone to uneven contact resistance distribution, local overheating, accelerated insulation aging, and arc discharge; 2) Insufficient process reliability: The quality of crimping relies too much on manual experience, the consistency of process parameters is poor, the conductor is easily damaged or broken, and the current carrying capacity is reduced; 3) Insufficient mechanical strength: The tensile strength of the crimped joint is low, and there is a risk of connection loosening under long-term vibration. Utility Model Content

[0003] The purpose of this invention is to provide a high-voltage device main power cable crimping terminal structure that features stable crimping quality, low contact resistance, high tensile strength, and continuous crimping of cables for multiple devices without interruption.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a crimping terminal structure for a main power cable of a high-voltage device, the structure of which includes a terminal body and a cable conductor pressure plate; the terminal body is a U-shaped groove, the radius of which matches the radius of the conductor, and a guide groove is provided at a relative position on the inner surface of the U-shaped groove, the guide groove extending along the length direction of the U-shaped groove and close to the opening of the U-shaped groove; the two sides of the cable conductor pressure plate are inserted into the guide groove, thereby constraining the conductor within the terminal body.

[0005] Preferably, a threaded hole is provided on the cable conductor pressure plate, and the threaded hole extends through its upper and lower surfaces; a wire clamp nut pressure plate is provided in the U-shaped groove above the cable conductor pressure plate, and the bottom of the bolt on the wire clamp nut pressure plate is screwed out of the bottom of the threaded hole.

[0006] Preferably, it also includes a wire clamp buckle, which is installed on the wire clamp nut pressure plate and is installed at intervals with the bolts on the wire clamp nut pressure plate. Its two ends are snapped onto the two sides of the terminal body to axially lock the terminal body.

[0007] Preferably, it also includes a terminal insulation box holder and a terminal insulation box cover; the terminal insulation box holder is located below the terminal body, and the terminal insulation box cover is located above the terminal body, and the two are fastened together to complete the insulation protection.

[0008] Compared with the prior art, this utility model has the following advantages: it solves the problems of poor consistency and safety hazards in traditional crimping processes; it provides stable crimping quality, low contact resistance, and high tensile strength. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model; Figure 2 yes Figure 1 AA view; Figure 3 This is a schematic diagram of the structure of an embodiment of the present utility model (excluding the terminal insulation box cover); Figure 1-3 In the middle, 101, terminal body; 102, wire clamp nut pressure plate; 103, wire clamp upper buckle; 104, cable conductor pressure plate; 105, terminal insulation box base; 106, terminal insulation box cover. Detailed Implementation

[0010] It should be noted that the terms "upper" and "lower" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product is usually placed during use. They are only used for the convenience of describing this utility model and simplifying the description, and therefore should not be construed as limiting this utility model. Those skilled in the art should interpret them in accordance with the solution of this utility model.

[0011] The following is in conjunction with the appendix Figure 1-3 The present invention is further described in detail as follows: A crimping terminal structure for a main power cable of a high-voltage device includes a terminal body 101 and a cable conductor pressure plate 104. The terminal body 101 is a U-shaped groove with a radius matching the standard radius of the copper core of the conductor. A guide groove is opened at a relative position on the inner surface of the U-shaped groove, extending along the length of the U-shaped groove and close to the opening of the U-shaped groove. The two sides of the cable conductor pressure plate 104 are inserted into the guide groove, thereby constraining the conductor within the terminal body 101.

[0012] As a preferred embodiment of this invention, it also includes a wire clamp nut plate 102, a wire clamp buckle 103, and bolts. Multiple threaded holes are formed along the length of the wire clamp nut plate 102. In this embodiment, there are 5 threaded holes, 2 wire clamp buckles, and 3 bolts. After the conductor and cable conductor plate 104 are placed into the U-shaped groove of the terminal body, the wire clamp nut plate 102 is quickly pressed into the guide groove using F-type quick crimping pliers, achieving high-precision crimping under an operating force of ≤200N (compared to ≥1500N with traditional hydraulic pliers). After the wire clamp nut plate 102 is pressed in, the 3 threaded holes on the cable conductor plate 104 are aligned with the middle and end threaded holes on the wire clamp nut plate 102, and the two are fixed together by bolts. Simultaneously, the bolt ends pass through the bottom of the threaded holes in the cable conductor plate 104 and press against the conductor. The wire clamp buckle 103 is installed on the wire clamp nut plate 102, spaced apart from the bolts.

[0013] In a preferred embodiment of this invention, notches are provided at corresponding positions of the terminal body 101 and the wire clamp buckle 103, so that the two ends of the wire clamp buckle 103 are engaged with the notches on both sides of the terminal body 101 to achieve axial locking.

[0014] In a preferred embodiment of this invention, in order to achieve double insulation protection, a terminal insulation box cover 106 and a terminal insulation box base 105 are respectively provided above and below the terminal body, and the two are fastened together.

[0015] How to use the structure: 1) Cable pretreatment: Remove the outer insulation and shielding layers of the cable, with a stripping length of L+D (L is the crimping length, and D is the insulation withstand voltage isolation length, calculated at 10kV / mm, taking 30mm~40mm); grind away the ionization layer on the surface of the inner insulation layer, insert a withstand voltage heat shrink tubing, and heat-seal the shielding layer boundary. 2) Press-fit assembly: Embed the cable conductor into the U-shaped groove of the terminal body 101, and cover the cable conductor pressure plate 104; push the wire clamp nut pressure plate 102 along the guide groove, and use F-type crimping pliers to crimp to the mechanical limit; 3) Insulating encapsulation: The terminal insulation box base 105 and the terminal insulation box cover 106 are closed and secured with cable ties to complete full insulation protection.

Claims

1. A crimp terminal structure for the main power cable of a high-voltage device, characterized in that: Its structure includes a terminal body and a cable conductor pressure plate; the terminal body is a U-shaped groove with a radius matching the conductor radius, and a guide groove is provided at a relative position on the inner surface of the U-shaped groove. The guide groove extends along the length of the U-shaped groove and is close to the opening of the U-shaped groove; the two sides of the cable conductor pressure plate are inserted into the guide groove, thereby constraining the conductor within the terminal body.

2. The high-voltage device main power cable crimping terminal structure according to claim 1, characterized in that: A threaded hole is provided on the cable conductor pressure plate, and the threaded hole extends through its upper and lower surfaces; a wire clamp nut pressure plate is installed in the U-shaped groove above the cable conductor pressure plate, and the bottom of the bolt on the wire clamp nut pressure plate is screwed out of the bottom of the threaded hole.

3. The high-voltage device main power cable crimping terminal structure according to claim 2, characterized in that: It also includes a wire clamp buckle, which is installed on the wire clamp nut pressure plate and spaced apart from the bolts on the wire clamp nut pressure plate. Its two ends are snapped onto the two sides of the terminal body to axially lock the terminal body.

4. The high-voltage device main power cable crimping terminal structure according to claim 1, characterized in that: It also includes a terminal insulation box holder and a terminal insulation box cover; the terminal insulation box holder is located below the terminal body, and the terminal insulation box cover is located above the terminal body. The two are fastened together to complete the insulation protection.

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