Pre-insulated terminal

Abstract

The utility model relates to a wiring terminal, in particular to a pre-insulated terminal. A pre-insulation terminal comprises an insulation tube and a conductor tube, the insulation tube is provided with an axially penetrating through hole, the conductor tube is provided with an equal-outer-diameter section and an inner section, the through hole at least comprises an equal-inner-diameter section, a reducing section, an expanding section and a matching section in sequence in the axial direction, and a horn mouth of the inner section is limited to the position where the expanding section and the matching section are close to each other. The maximum inner edge of the horn mouth of the inner section is relatively located on the circumferential outer side of the minimum inner edge of the reducing section, and at least the inner wall of the matching section is attached to part of the outer wall of the inner section or part of the outer wall of the equal-outer-diameter section. The included angle formed between the inner wall of the reducing section and the inner wall of the equal-inner-diameter section is larger than 120 degrees and smaller than the included angle formed between the inner wall of the horn mouth of the inner section and the inner wall of the equal-inner-diameter section. The positioning device has the advantage that the positioning coaxial precision and the positioning and fixing stability of the tubular part with the inner convex ring at the end part can be ensured.

Description

Technical Field

[0001] The utility model relates to a wiring terminal, in particular to a pre-insulated terminal. Background Art

[0002] Chinese Patent with application number 202121627513.7 discloses a convenient wire-passing type insulating terminal, which includes an insulating tube and a conductor tube. A first connecting portion is arranged on the outer side of the lower end of the conductor tube, and a second connecting portion cooperating with the first connecting portion is arranged on the inner wall of the insulating tube. The inner wall at the lower end opening of the conductor tube is a trumpet-shaped first guiding surface that gradually narrows upward, and the included angle A formed by the trumpet-shaped first guiding surface and the inner wall of the insulating tube is greater than 90°.

[0003] When a wire harness is passed through, the wire harness penetrates into the insulating tube from the lower end opening of the insulating tube and finally passes out from the upper end opening of the conductor tube. During the process that the wire harness enters the conductor tube in the insulating tube, the copper wires of the wire harness abut against the trumpet-shaped first guiding surface and are bent by the trumpet-shaped first guiding surface. The bending direction is obliquely upward bending, so that the copper wires of the wire harness can enter the conductor tube without being blocked to form reverse wires.

[0004] However, the above scheme has the following defects: The conductor tube has a first connecting portion extending radially outward in the circumferential direction, and the insulating tube has a second connecting portion for cooperating with the first connecting portion. For the convenience of assembly, the insulating tube is directly injection-molded outside the conductor tube. If the insulating tube or the conductor tube is damaged, the entire pre-insulated terminal needs to be replaced, and the production cost is relatively high. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a pre-insulated terminal that is convenient for maintenance and has a relatively low production cost.

[0006] To achieve the above purpose, the utility model adopts the following technical scheme: A pre-insulated terminal includes an insulating tube and a conductor tube. The insulating tube has an axially penetrating through-hole. The conductor tube has an equal outer diameter section and an inner section with a trumpet-shaped end located in the through-hole. The through-hole axially sequentially includes at least an equal inner diameter section, a reduced diameter section, an enlarged diameter section, and a matching section. The maximum inner diameter of the reduced diameter section and the maximum inner diameter of the enlarged diameter section are both greater than the maximum outer diameter of the inner section. The inner diameter at the end of the matching section and the outer diameter of the equal outer diameter section are both smaller than the maximum outer diameter of the inner section. When the insulating tube is connected to the conductor tube, the trumpet-shaped opening of the inner section is restricted at the position where the enlarged diameter section and the matching section are close to each other. The maximum inner edge of the trumpet-shaped opening of the inner section is circumferentially outside the minimum inner edge of the reduced diameter section. At least the inner wall of the matching section is in contact with part of the outer wall of the inner section or part of the outer wall of the equal outer diameter section. The included angle formed between the inner wall at the reduced diameter section and the inner wall at the equal inner diameter section is α, and the included angle formed between the inner wall at the trumpet-shaped opening of the inner section and the inner wall at the equal inner diameter section is β. β > α, and α is greater than 120°.

[0007] Preferably, the fitting section includes a first fitting section and a second fitting section. The first fitting section is located between the diameter-expanding section and the second fitting section. The inner diameter of the first fitting section gradually decreases from the diameter-expanding section side to the second fitting section side. The inner diameter of the second fitting section is smaller than that of the first fitting section. The included angle formed between the inner wall at the first fitting section and the inner wall at the equal-inner-diameter section is greater than β.

[0008] The inner diameter of the first fitting section gradually decreases from the diameter-expanding section side to the second fitting section side. When the conductor tube cannot contact the diameter-expanding section due to processing or dimensional problems at the bell mouth, or when the conductor tube moves excessively due to assembly problems, it can contact the first fitting section side, which can achieve progressive fastening between the conductor tube and the insulating tube, improving the tightness and stability of the connection. Through the design of different inner diameters of the first fitting section, conductors of different sizes can be adapted, increasing the versatility and applicability of the terminal. The second fitting section is used to increase the contact area with the conductor tube.

[0009] The included angle formed between the inner wall at the first fitting section and the inner wall at the equal-inner-diameter section is greater than β. The optimized angle design helps improve the connection strength and electrical performance of the terminal, while reducing stress concentration during installation.

[0010] Preferably, the maximum inner diameter of the diameter-expanding section is smaller than the maximum inner diameter of the diameter-reducing section.

[0011] The above setting facilitates the abutment of the inner bell mouth of the conductor tube against the inner wall of the diameter-expanding section, enabling it to grip the inner section of the conductor tube more tightly during connection, thereby improving the stability and reliability of the connection. At the same time, it can improve the structural strength of the insulating tube at the connection with the conductor tube.

[0012] Preferably, there is an arc transition between the equal-outer-diameter section and the inner section.

[0013] The above setting helps for better contact between the wire and the conductor tube, reducing the possibility of poor contact, thereby improving the reliability of the electrical connection. At the same time, it can improve the structural strength at the connection between the inner section and the equal-outer-diameter section.

[0014] The utility model can ensure the advantages of positioning coaxial accuracy and positioning and fixing stability of the tubular part with an inner convex ring at the end. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a cross-sectional view of a pre-insulated terminal of the utility model.

[0016] Figure 2 is an enlarged view of the connection between the insulating tube and the conductor tube in this embodiment.

[0017] Figure 3 is a schematic structural view of this embodiment. DETAILED DESCRIPTION

[0018] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0019] Depend on Figures 1 to 3 As shown, this embodiment discloses a joint pre-insulated terminal, including a connecting strip 100 and a plurality of pre-insulated terminals 200 fixed to the connecting strip 100, each pre-insulated terminal including an insulating tube 1 and a conductor tube 2. The conductor tube 2 has a uniform outer diameter section 21 and an inner section 22 with a flared end and located in the through hole, and the uniform outer diameter section 21 and the inner section 22 have an arc transition.

[0020] The insulating tube 1 has a through hole 10 axially passing through both ends. The through hole 10 includes at least a constant inner diameter section 11, a reduced diameter section 12, an expanded diameter section 13 and a matching section in the axial direction. The matching section includes a first matching section 14 and a second matching section 15.

[0021] The first matching section 14 is located between the expanding diameter section 13 and the second matching section 15. The inner diameter of the first matching section 14 gradually decreases from the expanding diameter section side to the second matching section 15 side. The inner diameter of the second matching section 15 is smaller than the inner diameter of the first matching section 14. The maximum inner diameter of the reducing diameter section 12 and the maximum inner diameter of the expanding diameter section 13 are both larger than the maximum outer diameter of the inner section 22. The inner diameter at the second matching section 15 and the outer diameter of the equal outer diameter section 21 are both smaller than the maximum outer diameter of the inner section 22. The maximum inner diameter of the expanding diameter section 13 is smaller than the maximum inner diameter of the reducing diameter section 12.

[0022] When the insulating tube 1 is connected to the conductor tube 2, the bell mouth of the inner section 22 is limited to the position where the expanded diameter section 13 and the first matching section 14 are close to each other, the maximum inner edge of the bell mouth of the inner section 22 is relatively located on the circumferential outside of the minimum inner edge of the reduced diameter section 12, the inner wall of the second matching section 15 is in contact with part of the outer wall of the equal outer diameter section 21, the angle formed by the inner wall at the reduced diameter section 12 and the inner wall at the equal inner diameter section 11 is α, the angle formed by the inner wall at the bell mouth of the inner section 22 and the inner wall at the equal inner diameter section 11 is β, and the angle γ formed by the inner wall at the first matching section and the inner wall at the equal inner diameter section is greater than β, β>α, and α is greater than 120°.

[0023] This embodiment has the advantage of being able to ensure the positioning coaxial accuracy and positioning and fixing stability of the tubular member having an inner convex ring at the end.

Claims

1. A pre-insulated terminal, comprising an insulating tube and a conductor tube. The insulating tube has a through hole axially penetrating therethrough, and the conductor tube has a section with an equal outer diameter and an inner section with a flared end located within the through hole. It is characterized in that: The through hole sequentially includes at least an equal inner diameter section, a reduced diameter section, an enlarged diameter section, and a mating section along the axial direction. The maximum inner diameter of the reduced diameter section and the maximum inner diameter of the enlarged diameter section are both greater than the maximum outer diameter of the inner section. The inner diameter at the end of the mating section and the outer diameter of the equal outer diameter section are both smaller than the maximum outer diameter of the inner section. When the insulating tube is connected to the conductor tube, the flare of the inner section is restricted at the position where the enlarged diameter section and the mating section approach each other. The maximum inner edge of the flare of the inner section is circumferentially outside the minimum inner edge of the reduced diameter section. At least the inner wall of the mating section is in contact with the outer wall of part of the inner section or part of the outer wall of the equal outer diameter section. The included angle formed between the inner wall at the reduced diameter section and the inner wall at the equal inner diameter section is α. The included angle formed between the inner wall at the flare of the inner section and the inner wall at the equal inner diameter section is β. β > α, and α is greater than 120°.

2. The pre-insulated terminal according to claim 1, characterized in that: The mating section includes a first mating section and a second mating section. The first mating section is located between the enlarged diameter section and the second mating section. The inner diameter of the first mating section gradually decreases from the enlarged diameter section side to the second mating section side. The inner diameter of the second mating section is smaller than the inner diameter of the first mating section. The included angle formed between the inner wall at the first mating section and the inner wall at the equal inner diameter section is greater than β.

3. The pre-insulated terminal according to claim 1 or 2, characterized in that: The maximum inner diameter of the enlarged diameter section is smaller than the maximum inner diameter of the reduced diameter section.

4. The pre-insulated terminal according to claim 1 or 2, characterized in that: The equal outer diameter section and the inner section are in arc transition.

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