CN-224217461-U - Fuse base

Abstract

The utility model discloses a fuse base, which comprises a shell and a terminal assembly, wherein terminal installation cavities are arranged at two ends of the shell, fastening holes are formed in the upper sides of the terminal installation cavities, wiring holes are formed in the outer side walls of the terminal installation cavities, and the terminal assembly comprises a wiring ring, a '匚' type compression ring, fastening screws, a wiring part and a clamping ring. The screw bolt fastening device is characterized in that guide ribs are arranged on the side walls of two sides of the mounting cavity, the guide ribs are abutted against the side faces of the 匚 -shaped compression ring, and an arc-shaped positioning concave surface matched with the screw bolt fastening head is arranged on a positioning block on the guide ribs. The structure can effectively prevent '匚' type compression ring from deviating and fasten screw heads from deviating, ensure even wire pressing force, improve wiring reliability and terminal assembly installation stability, reduce potential safety hazard, prolong service life and provide guarantee for safe operation of a circuit.

Inventors

• ZHANG HAILONG
• Peng Xuqiang
• ZHAO CHUANWANG
• LIN YIFENG

Assignees

• 多格电气有限公司

Dates

Publication Date

20260508

Application Date

20250729

Claims (7)

1. 1. The fuse base comprises a shell and a terminal assembly, wherein terminal installation cavities are formed in two ends of the shell, fastening holes are formed in the upper sides of the terminal installation cavities, wiring holes are formed in the outer side walls of the installation cavities, the terminal assembly comprises a wire connecting ring, a 匚 -type compression ring, fastening screws, a wiring part and a clamping ring.
2. 2. The fuse holder of claim 1, wherein the number of guide ribs is two and arranged in parallel.
3. 3. The fuse holder of claim 1, wherein the bottom of the guide rib extends to form a side contact portion that contacts the side wall of the grommet and a lower contact portion that contacts the bottom wall of the grommet, and a ventilation gap is provided between the lower contact portion and the bottom wall of the grommet.
4. 4. The fuse holder of claim 1, wherein one end of the 匚 'type pressure ring extends into the wire connecting ring to be abutted against the bottom of the fastening screw, one end of the fastening screw is in threaded connection with a screw hole on the wire connecting ring, and the other end extends out of a through hole on the upper side of the 匚' type pressure ring.
5. 5. The fuse holder of claim 1 or 4, wherein the connection part comprises a connection piece connected with the connection ring and a U-shaped part integrally formed at one end of the connection piece, the clamping ring is clamped outside the U-shaped part, side positioning parts and bottom positioning parts are arranged on the outer wall and the bottom wall of the U-shaped part, and positioning grooves for positioning the clamping ring are arranged in the middle of the side positioning parts and the bottom positioning parts.
6. 6. The fuse holder of claim 5, wherein the housing has a first slot and a second slot for receiving the connecting piece, and a step between the first slot and the second slot has a recess for receiving the clamping ring and the bottom positioning portion.
7. 7. The fuse holder of claim 6, wherein said tab and said 匚 are provided with a plurality of ribs spaced apart on opposite ends of said tab and said ring.

Description

Fuse base Technical Field The utility model relates to the technical field of circuit breakers, in particular to a fuse base. Background In the field of circuit protection of power systems and electrical equipment, a fuse is widely applied to various distribution lines and electrical equipment as a key overcurrent protection device so as to prevent equipment damage and even safety accidents caused by faults such as overload or short circuit of the circuit. The fuse base is used as a matched mounting component of the fuse, and the fuse base has the main functions of realizing reliable connection of the fuse and an external circuit, providing stable mounting support for the fuse and ensuring that the fuse can work normally in the circuit. The fuse base in the prior art generally comprises a housing and a terminal assembly, wherein terminal installation cavities at two ends of the housing are used for accommodating the terminal assembly, and an external wire is fixedly connected with a wiring part of the terminal assembly through a structure of a '匚' type press ring and the like matched with a fastening screw in a fastening hole (as disclosed in application number CN 201820533450.0). However, such fuse bases present some significant problems during actual installation and use. Specifically, when the "匚" type press ring is tightened by the tightening screw to fix the wire, lateral offset or tilting easily occurs during the stress due to the lack of an effective guiding and positioning structure of the "匚" type press ring in the terminal installation cavity. The offset not only can reduce the matching precision between the 匚 -shaped compression ring and the wiring part, but also can lead to uneven distribution of the compression force of the wire, influence the reliability of wiring, even possibly cause poor contact of the wire and increase of contact resistance, and further cause potential safety hazards such as local heating and the like. Meanwhile, in the tightening process of the fastening screw, the screw head of the fastening screw is deflected due to lack of positioning, so that the position deviation of the 匚 -shaped compression ring is further increased, and the installation stability of the whole terminal assembly is reduced. In addition, when the fuse is used for a long time or is influenced by external vibration and other factors, the problem of the offset of the '匚' type compression ring can be serious, so that the service life of the fuse base is influenced, and the safety operation of the whole circuit is threatened. Therefore, how to optimize the structure of the fuse base, especially to provide an effective guiding and positioning structure for the "匚" type press ring and the fastening screw, so as to improve the installation stability and the wiring reliability of the terminal assembly, is a technical problem to be solved by those skilled in the art. Disclosure of utility model Aiming at the defects in the background technology, the utility model provides a fuse base. The fuse base comprises a shell and a terminal assembly, wherein terminal installation cavities are formed in two ends of the shell, fastening holes are formed in the upper sides of the terminal installation cavities, wiring holes are formed in the outer side walls of the installation cavities, the terminal assembly comprises a wire connecting ring, a 匚 'type compression ring, fastening screws, a wiring part and a clamping ring, guide ribs are arranged on the side walls of two sides of the installation cavities, the guide ribs are abutted to the side faces of the 匚' type compression ring, positioning blocks are arranged on the guide ribs, and arc-shaped positioning concave faces matched with screw heads of the fastening screws are arranged on the positioning blocks. Furthermore, the number of the guide ribs is two, and the guide ribs are arranged in parallel. Further, the bottom of the guide rib is extended with a side abutting part abutting against the side wall of the wiring ring and a lower abutting part abutting against the bottom wall of the wiring ring, and a ventilation gap is reserved between the lower abutting part and the bottom wall of the wiring ring. Further, one end of the 匚 -shaped compression ring stretches into the wire connecting ring to be abutted against the bottom of the fastening screw, one end of the fastening screw is in threaded connection with a screw hole on the wire connecting ring, and the other end of the fastening screw stretches out from a through hole on the upper side of the 匚 -shaped compression ring. Further, the wiring portion includes the connection piece that is connected with the wiring ring and integrated into one piece is at the "U" type portion on connection piece one end, the clamp ring centre gripping is outside "U" type portion, be provided with side location portion and end location portion on the outer wall and the diapire of "U" type portion, side location portion and end location p