CN219123172U

CN219123172U - Fastening type fuse electric connection terminal

Info

Publication number: CN219123172U
Application number: CN202223437910.5U
Authority: CN
Inventors: 郭浪; 刘彬彬; 吴伟军
Original assignee: Calf Electric Suzhou Co ltd
Current assignee: Calf Electric Suzhou Co ltd
Priority date: 2022-12-22
Filing date: 2022-12-22
Publication date: 2023-06-02
Anticipated expiration: 2032-12-22

Abstract

The utility model provides a fastening type fuse electric connection terminal, which is respectively arranged at two ends of a cylindrical fuse, and comprises an outer metal piece and a crown spring; the outer metal piece comprises a fuse connecting part and a cable connecting part, the fuse connecting part of the outer metal piece is changed into a cylindrical sleeve-shaped plug-in terminal which is matched with a cylindrical structure of the end part of the fuse, and the end part of the cylindrical fuse can be wrapped and tightly clamped by the plug-in connection through the crown spring, so that the contact area is larger, the resistance is smaller, the tightness is stronger, and meanwhile, the convenience and the rapidness in installation can be ensured, and the fuse can be detached and replaced conveniently.

Description

Fastening type fuse electric connection terminal

Technical Field

The present utility model relates to electrical connection of fuses, and more particularly, to a fastening type electrical fuse connection terminal.

Background

The fuse is a common component in the circuit, plays an overload protection role, and can be fused to cut off the current when the current abnormally rises to a certain current value and heat, so that the circuit is protected from running safely. Photovoltaic power generation is a mainstream sustainable energy source at present, and electric energy generated by a solar panel needs to be transmitted to a converter or a combination box, so that a safe and environment-friendly connection mode is needed to ensure the stability of power generation. In the conventional photovoltaic power station construction process, in view of practical installation condition limitation and cost control, cables around a junction box, an inverter and the like are generally connected in a direct current junction mode, but the safety performance of the system is reduced in this mode. At present, for the importance of using safety of a photovoltaic system, fuses are usually added on positive or negative cables of peripheral cable equipment such as a junction box, an inverter and the like to carry out overload protection.

Fuses used in photovoltaic systems are generally cylindrical in shape, with the ends of the fuse being secured to respective fuse clips/mounts, which are in turn secured to electrical cables or other electrical structures. The fuse clip commonly used as a wiring terminal is a conventional open terminal, and two elastic pieces arranged opposite to each other are clamped at the end of the fuse, so that clamping and fixing as well as electrical connection are realized. The fuse clip/seat is convenient to install and replace, but has small contact area with the end part of the fuse, so that the resistance is larger; in addition, the open-type clamping terminal is extremely easy to lead to the falling of the fuse, and the fixing effect is poor. To overcome the above-mentioned drawbacks, there is a need for an electrical connection terminal that is easy to install and can be fastened to both ends of a fuse, and is not easy to fall off.

Disclosure of Invention

The utility model aims to solve the problems that a fuse clip used as a fuse electric connecting terminal at present has small contact area with a fuse, large resistance and unstable clamping and is easy to fall off.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

the fastening type fuse electric connection terminal is respectively arranged at two ends of the cylindrical fuse and comprises an outer metal piece and a crown spring; the outer metal piece comprises a fuse connecting part and a cable connecting part, one end of the fuse connecting part is opened and is internally provided with a cylindrical cavity, the crown spring is arranged in the cavity of the fuse connecting part, the crown spring is of a drum spring elastic structure and comprises a plurality of contact spring pieces which are distributed at intervals, and the contact spring pieces are protruded towards the inside of the crown spring; the fuse connecting part is connected with the end part of the cylindrical fuse in a plug-in mode, the contact elastic piece of the crown spring wraps and abuts against the end part of the cylindrical fuse, and the cable connecting part is connected with the cable.

Preferably, the contact spring pieces of the crown springs form a straight stripe-shaped or inclined stripe-shaped or curved stripe-shaped or grid-shaped structure.

Preferably, the contact spring pieces of the crown spring are uniformly distributed at intervals.

Preferably, the maximum diameter of the two ends of the crown spring is equal to the inner diameter of the fuse connecting part, and the crown spring is coaxially clamped and fixed in the cavity of the fuse connecting part.

Preferably, the opening edge of the fuse connecting part is provided with an inward flange, and the end part of the crown spring is clamped and fixed inside the flange.

Preferably, the axial length of the crown spring is equal to the axial length of the internal cavity of the fuse connection.

Preferably, the outer metal piece is an integrally formed structure.

Preferably, the fuse connection portion and the cable connection portion are both cylindrical and integrally connected in the axial direction.

Preferably, the cable wire is riveted with the cable connection.

Preferably, both ends of the cylindrical fuse are wrapped with cylindrical metal caps, the fuse connecting part is connected with the metal caps in a plug-in mode, and the crown spring is tightly hooped on the periphery of the metal caps.

Compared with the prior art, the utility model improves the traditional open-type fuse clip formed by two shrapnel into a cylindrical wrapped terminal structure, and the inside of the fuse clip is provided with the crown spring. The electric fuse can be directly inserted into the end part of the cylindrical fuse during installation, the fuse connecting part is wrapped at the end part of the fuse, and the internal crown spring can elastically abut against and press the cylindrical end part of the fuse, so that the contact area between the electric connecting terminal and the fuse is increased, and the resistance is reduced; meanwhile, the connection is more firm, the fuse is not easy to fall off, and the electric connection effect is better; in addition, the utility model adopts a plug-in connection mode, has simple installation mode and high installation speed, and is convenient for replacing the fuse.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a mounting structure of a fastening type fuse electrical connection terminal;

FIG. 2 is a schematic view of an explosive mounting structure of a fastening type fuse electrical connection terminal;

FIG. 3 is a schematic structural view of an outer metal piece;

fig. 4 is a schematic structural view of the crown spring.

The electric connection terminal 100, the fuse 200, the outer metal piece 110, the fuse connection part 111, the cable connection part 112, the flange 113, the crown spring 120, the contact spring piece 121 and the metal cap 210.

Detailed Description

For a further understanding of the objects, construction, features, and functions of the utility model, reference should be made to the following detailed description of the preferred embodiments.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to fig. 1-4, a fastening type fuse electric connection terminal, the electric connection terminal 100 is respectively installed at two ends of a cylindrical fuse 200, and includes an outer metal member 110 and a crown spring 120; the outer metal piece 110 comprises a fuse connecting part 112 and a cable connecting part 112, one end of the fuse connecting part 112 is opened and is internally provided with a cylindrical cavity, the crown spring 120 is arranged in the cavity of the fuse connecting part 112, the crown spring 120 is of a drum spring elastic structure and comprises a plurality of contact elastic pieces 121 which are distributed at intervals, and the contact elastic pieces 121 are protruded towards the inside of the crown spring 120; the fuse connecting part 112 is connected with the end part of the cylindrical fuse 200 in a plug-in way, the contact elastic sheet 121 of the crown spring 120 wraps and abuts against the end part of the cylindrical fuse 200, and the cable connecting part 112 is connected with a cable.

The electrical connection terminals 100 are mounted at both ends of the cylindrical fuse 200, one end of which is used to connect the fuse 200 and the other end of which is used to connect a cable or other electrical element, thereby connecting the fuse 200 into a circuit. The fuse connection part 112 of the electric connection terminal 100 is designed into a hollow cylinder shape, one end of the fuse connection part is opened for plug connection with the end part of the fuse 200, and the crown spring 120 is also arranged in the cavity, and the crown spring 120 is a structure with a contact spring piece 121 protruding inwards, and the minimum diameter of the crown spring 120 is smaller than the diameter of the end part of the cylindrical fuse 200, so when the fuse connection part 112 of the outer metal piece 110 is inserted opposite to the end part of the cylindrical fuse 200, the crown spring 120 is gradually wrapped around the end part of the fuse 200 and the contact spring piece 121 is extruded and pressed against the end part of the fuse 200. Compared with the current common connection mode that the open-type fuse 200 is clamped at two sides of the fuse 200, the electric connection terminal 100 is changed into plug-in connection, the cylindrical fuse 200 metal piece is wrapped at the end of the fuse 200, the internal crown spring 120 abuts against the end of the extruded fuse 200, the contact area and friction force are increased, the connection firmness is improved, the connection terminal is not easy to fall off, the reliability of electric connection is enhanced, meanwhile, the resistance is reduced due to the increase of the contact area, so that the electric connection effect is better, and the circuit is safer. In addition, the electrical connection terminal 100 of the present utility model is a plug-in type installation method, which is also simple and quick to install, and facilitates the disassembly and replacement of the fuse 200.

In one embodiment, the contact spring pieces 121 of the crown spring 120 form a straight stripe or oblique stripe or curved stripe or grid structure; the contact spring piece 121 of the crown spring 120 can be in any shape, and only needs to integrally meet the two characteristics of inward bulge and easy elastic deformation, when the fuse 200 and the electric connection terminal 100 are installed in a plugging manner, the crown spring 120 is spread by the end of the fuse 200 and tightly hooped at the end of the fuse 200, and the contact spring piece 121 of the crown spring 120 is restored to the original shape after being pulled out.

In a preferred embodiment, the contact spring pieces 121 of the crown spring 120 are uniformly distributed at intervals, so that the crown spring 120 can be ensured to be uniformly stressed on the periphery when being tightly clamped at the end of the fuse 200, and the connection effect is better.

In a preferred embodiment, the maximum diameter of the two ends of the crown spring 120 is equal to the inner diameter of the fuse connecting part 112, the crown spring 120 is coaxially clamped in the cavity of the fuse connecting part 112, and the crown spring 120 is simple and convenient to install because the structure of the crown spring 120 has elastic deformation capability. Further, the opening edge of the fuse connecting portion 112 is provided with an inward flange 113, the end of the crown spring 120 is clamped and fixed inside the flange 113, the process is simple, and the crown spring 120 can be effectively prevented from falling off from the fuse connecting portion 112.

Preferably, the axial length of the crown spring 120 is equal to the axial length of the internal cavity of the fuse connecting part 112, so that the two ends of the crown spring 120 just abut against the two internal ends of the fuse connecting part 112, preventing the crown spring 120 from moving in the cavity, and facilitating the plug-in installation.

In one embodiment, the outer metal 110 is a unitary structure. Preferably, the fuse connection part 112 and the cable connection part 112 are both cylindrical and integrally connected along the axial direction, one end is connected with the fuse 200, and the other end is connected with the cable, so that the installation is more convenient. The cable wires and the cable connecting part 112 can be connected by riveting, or can be connected by plugging, bonding, welding and the like.

In an embodiment, both ends of the cylindrical fuse 200 are wrapped with the cylindrical metal cap 210, the fuse connecting portion 112 is connected with the metal cap 210 in a plug-in manner, the crown spring 120 is tightly fastened on the periphery of the metal cap 210, so as to enhance the matching degree and the connection tightness between the fuse connecting portion 112 and the fuse 200.

In summary, the utility model improves the structure of the existing electric connection terminal of the fuse, changes the traditional open-type fuse clip into a cylindrical sleeve-shaped plug-in terminal, is matched with the cylindrical structure of the end part of the fuse, is internally provided with the crown spring, is connected in a plug-in manner and can wrap the end part of the cylindrical fuse in a tightly-hooped manner, so that the contact area is larger, the resistance is smaller, the tightness is stronger, and meanwhile, the installation is simple, convenient and quick, and the fuse is convenient to detach and replace.

The utility model has been described with respect to the above-described embodiments, however, the above-described embodiments are merely examples of practicing the utility model. It should be noted that the disclosed embodiments do not limit the scope of the utility model. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims

1. Fastening type fuse electric connection terminal, electric connection terminal installs at cylindrical fuse's both ends, its characterized in that respectively: comprises an outer metal piece and a crown spring; the outer metal piece comprises a fuse connecting part and a cable connecting part, one end of the fuse connecting part is opened and is internally provided with a cylindrical cavity, the crown spring is arranged in the cavity of the fuse connecting part, the crown spring is of a drum spring elastic structure and comprises a plurality of contact spring pieces which are distributed at intervals, and the contact spring pieces are protruded towards the inside of the crown spring; the fuse connecting part is connected with the end part of the cylindrical fuse in a plug-in mode, the contact elastic piece of the crown spring wraps and abuts against the end part of the cylindrical fuse, and the cable connecting part is connected with the cable.

2. The fastened-type fuse electrical connection terminal of claim 1, wherein: the contact spring pieces of the crown springs form a straight stripe-shaped or inclined stripe-shaped or bent stripe-shaped or grid-shaped structure.

3. The fastened-type fuse electrical connection terminal of claim 2, wherein: the contact spring pieces of the crown springs are uniformly distributed at intervals.

4. The fastened-type fuse electrical connection terminal of claim 1, wherein: the maximum diameter of the two ends of the crown spring is equal to the inner diameter of the fuse connecting part, and the crown spring is coaxially clamped and fixed in the cavity of the fuse connecting part.

5. The fastened-type fuse electrical connection terminal of claim 4, wherein: the edge of the opening of the fuse connecting part is provided with an inward flange, and the end part of the crown spring is clamped and fixed on the inner side of the flange.

6. The fastened-type fuse electrical connection terminal of claim 5, wherein: the axial length of the crown spring is equal to the axial length of the internal cavity of the fuse connection.

7. The fastened-type fuse electrical connection terminal of claim 1, wherein: the outer metal piece is of an integrated structure.

8. The fastened-type fuse electrical connection terminal of claim 7, wherein: the fuse connecting portion and the cable connecting portion are cylindrical and integrally connected along the axis direction.

9. The fastened-type fuse electrical connection terminal of claim 8, wherein: and the cable wire is riveted with the cable connecting part.

10. The fastened-type fuse electrical connection terminal of claim 1, wherein: the two ends of the cylindrical fuse are wrapped with cylindrical metal caps, the fuse connecting part is connected with the metal caps in a plug-in mode, and the crown springs are tightly hooped on the periphery of the metal caps.