CN215644366U

CN215644366U - Fuse tube

Info

Publication number: CN215644366U
Application number: CN202122337643.3U
Authority: CN
Inventors: 张云根; 郑君; 熊小利
Original assignee: Zhejiang Leian Electric Co ltd
Current assignee: Zhejiang Leian Electric Co ltd
Priority date: 2021-09-26
Filing date: 2021-09-26
Publication date: 2022-01-25
Anticipated expiration: 2031-09-26

Abstract

The utility model provides a fuse tube, and belongs to the technical field of electrical insulation. It has solved the not enough problem of security. It includes lower extreme open-ended barrel and all inlays metal connection terminal and a plurality of metal inserts of locating in the barrel upper end, each metal insert arranges around the leading-out terminal of metal connection terminal, the lower extreme of each metal insert flushes mutually and is less than the leading-out terminal bottom surface of metal connection terminal, still inlay in the barrel upper end and be equipped with the metal shield cover, the metal shield cover is bowl form and its opening down, the metal connection terminal is located metal shield cover inboard and both are fixed mutually, the metal shield cover covers each metal insert and the lower extreme of metal shield cover is less than the bottom surface of each metal insert, still have the metal wire that switches on the leading-out terminal of metal connection terminal and each metal insert mutually in the barrel upper end. It has the advantages of high safety, good insulating property and the like.

Description

Fuse tube

Technical Field

The utility model belongs to the technical field of electrical insulation, and relates to a fuse tube.

Background

The fuse tube is an important fitting on the gas high-voltage switch cabinet, is cylindrical, is made of insulating materials, can be internally provided with connecting pieces such as a fuse tube and a contact to stretch into, be connected and conducted, and is protected and insulated through an external insulating tube body. For example, the fuse tube disclosed in patent application No. 201520008919.5 includes a cylindrical body, the front end of the body is open, the inner side of the rear end of the body is fixedly connected with a positioning seat, the inner side of the body is also fixedly connected with a circular guide member coaxially arranged with the body, the inner side of the guide member is provided with a conical guide surface, and the diameter of the guide surface is gradually reduced from front to back. During the use, stretch into this internal with the positioning seat with the connecting rod and be connected, the guide can lead the connecting rod to make the connecting rod more stable at this internal connection.

Wherein, the guide part is including being annular connecting portion of circle and being coniform guide part, in order to fix the guide part at this internal, just need the metal insert of a plurality of threaded holes of internal fixation, cooperate through fastener and metal insert's screw hole and fix the connecting portion of guide part. The fastener and the metal insert are both made of metal materials, so when the fuse tube is in a working state, discharge can be generated at the joint of the fastener and the metal insert, the insulating property is affected, and the safety is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a fuse tube aiming at the problems in the prior art, and solves the problem of insufficient safety.

The purpose of the utility model can be realized by the following technical scheme:

a fuse section of thick bamboo, including lower extreme open-ended barrel and all inlay metal connection terminal and a plurality of metal inserts of locating in the barrel upper end, each metal insert arranges around the leading-out terminal of metal connection terminal, the lower extreme of each metal insert flushes mutually and is less than the leading-out terminal bottom surface of metal connection terminal, its characterized in that, barrel upper end in still inlay and be equipped with metal shielding cover, metal shielding cover is bowl form and its opening down, metal connection terminal is located metal shielding cover inboard and both are fixed mutually, metal shielding cover covers each metal insert and the lower extreme of metal shielding cover is less than the bottom surface of each metal insert, still have the wire that switches on the leading-out terminal of metal connection terminal and each metal insert mutually in the barrel upper end.

In the fuse tube, the metal wires are utilized to conduct the metal inserts and the wire outlet ends of the metal wire holders, namely, the metal inserts are conducted with each other, and the metal shielding covers cover the wire outlet ends of the metal inserts and the metal wire holders at the same time, so that discharge generated between the metal inserts and the fasteners due to fixing of the guide pieces can be eliminated, the insulating property is guaranteed, and the use safety is improved.

In the fuse tube, two ends of each metal wire are respectively provided with a metal connecting sheet, the metal insert and the metal wire are fixed by screws which penetrate through the corresponding metal connecting sheets and into the metal insert, and the metal wire holder and the metal wire are fixed by screws which penetrate through the corresponding metal connecting sheets and into the wire outlet ends of the metal wire holder.

The metal connecting sheet is arranged, so that the metal lead can be firmly fixed with the metal insert and the metal wiring seat.

In the fuse tube, the wire inlet end part of the metal wire holder extends out of the upper end side part of the tube body, and a creepage shed is arranged on the upper end side part of the tube body right below the wire inlet end of the metal wire holder.

The inlet wire end part of metal wire holder stretches out outside the upper end lateral part of barrel, means that the inlet wire end of metal wire holder is not covered by metal shield cover, consequently sets up through valve body upper end lateral part under the inlet wire end of metal wire holder and climbs the full skirt and can prevent here that the electric arc flashover from appearing, has improved safety in utilization.

In the fuse tube, the creepage umbrella skirt comprises three bulges distributed along the axis direction of the tube body, the distance between the highest points of the two adjacent bulges is equal, the wire inlet end of the metal wire holder is provided with a connecting hole with internal threads, and the distance between the central line of the connecting hole and the highest point of the bulge positioned at the uppermost part is equal to the distance between the highest points of the bulge positioned at the uppermost part and the highest point of the bulge positioned at the lowermost part.

Through the arrangement, the effect of preventing the electric arc from flashover is better.

In the fuse tube, the center of the top of the tube body is provided with a convex hull, and the outer surface of the convex hull is a spherical surface.

Compared with the prior art, the fuse tube conducts the metal inserts and the wire outlet ends of the metal wire holders by using the metal wires, and the metal shielding covers cover the metal inserts and the wire outlet ends of the metal wire holders, so that discharge generated between the metal inserts and the fasteners due to the fixing of the guide pieces can be eliminated, and the insulating property is ensured, and the use safety is improved.

Drawings

FIG. 1 is a cross-sectional view of the present fuse cartridge.

In the figure, 1, a cylinder; 1a, climbing an umbrella skirt; 1a1, convex; 1b, convex hull; 2. a metal wire holder; 2a, a wire outlet end; 2b, a wire inlet end; 2b1, connecting hole; 3. a metal insert; 4. a metal shield case; 5. a metal wire; 5a, metal connecting sheets.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, the fuse tube includes a tube body 1 with an opening at a lower end, and a metal wire holder 2 and a plurality of metal inserts 3 both embedded in an upper end of the tube body 1, a convex hull 1b is provided at a central position of a top of the tube body 1, an outer surface of the convex hull 1b is a spherical surface, the metal wire holder 2 has a wire outlet end 2a and a wire inlet end 2b, each metal insert 3 is arranged around the wire outlet end 2a of the metal wire holder 2, a lower end of each metal insert 3 is flush with and lower than a bottom surface of the wire outlet end 2a of the metal wire holder 2, and each metal insert 3 is used for installing and fixing a guide piece in the tube body 1. Still inlay in the barrel 1 upper end and be equipped with metal shield cover 4, metal shield cover 4 is the bowl form and its opening is down, and metal connection terminal 2 is located metal shield cover 4 inboard and both are fixed mutually (specifically can adopt the fastener to fix), and metal shield cover 4 covers each metal inserts 3 and the lower extreme of metal shield cover 4 is less than the bottom surface of each metal inserts 3, still has the metal wire 5 that switches on leading-out terminal 2a of metal connection terminal 2 and each metal inserts 3 mutually in the barrel 1 upper end. Specifically, both ends of each metal wire 5 are respectively provided with a metal connecting piece 5a, the metal insert 3 and the metal wire 5 are fixed by screws which pass through the corresponding metal connecting piece 5a and penetrate into the metal insert 3, and the metal wire holder 2 and the metal wire 5 are fixed by screws which pass through the corresponding metal connecting piece 5a and penetrate into the wire outlet end 2a of the metal wire holder 2. In the present embodiment, each metal component (e.g., the metal insert 3, the metal wire holder 2, the metal shield case 4, etc.) is placed in the cavity of the mold, and then the barrel 1 is molded by epoxy casting.

Furthermore, the wire inlet end 2b of the metal wire holder 2 partially extends out of the upper end side of the cylinder 1, and a creepage shed 1a is arranged on the upper end side of the cylinder 1 under the wire inlet end 2b of the metal wire holder 2. In this embodiment, the creepage umbrella skirt 1a includes three protrusions 1a1 distributed along the axial direction of the barrel 1, the distance between the highest points of two adjacent protrusions 1a1 is equal, the wire inlet end 2b of the metal wire holder 2 is provided with a connecting hole 2b1 with internal threads, and the distance between the center line of the connecting hole 2b1 and the highest point of the uppermost protrusion 1a1 is equal to the distance between the highest point of the uppermost protrusion 1a1 and the highest point of the lowermost protrusion 1a 1. For convenience of description, the uppermost protrusion 1a1 is referred to as a first protrusion, and the lowermost protrusion is referred to as a third protrusion, wherein the distance between the center line of the connecting hole 2b1 and the highest point of the first protrusion is 30cm, and the distance between the highest point of the first protrusion and the highest point of the third protrusion is 30 cm.

In the fuse cylinder, the metal wires 5 are utilized to conduct the metal inserts 3 with the wire outlet end 2a of the metal wire holder 2, namely, the metal inserts 3 are conducted with each other, and the metal shielding cover 4 covers the metal inserts 3 and the wire outlet end 2a of the metal wire holder 2 at the same time, so that the discharge generated between the metal inserts 3 and a fastener due to the fixing of a guide piece can be eliminated, the insulating property is ensured, and the use safety is improved.

The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.

Claims

1. The fuse tube comprises a tube body (1) with an opening at the lower end, a metal wire holder (2) and a plurality of metal inserts (3), wherein the metal wire holder (2) and the metal inserts (3) are embedded in the upper end of the tube body (1), each metal insert (3) is arranged around a wire outlet end (2a) of the metal wire holder (2), the lower ends of the metal inserts (3) are flush with each other and are lower than the bottom surface of the wire outlet end (2a) of the metal wire holder (2), the metal wire holder is characterized in that a metal shielding cover (4) is further embedded in the upper end of the barrel body (1), the metal shielding cover (4) is bowl-shaped, the opening of the metal shielding cover faces downwards, the metal wire holder (2) is located on the inner side of the metal shielding cover (4) and fixed to the metal shielding cover, the metal shielding cover (4) covers the metal inserts (3), the lower end of the metal shielding cover (4) is lower than the bottom face of each metal insert (3), and a metal wire (5) which enables a wire outlet end (2a) of the metal wire holder (2) to be communicated with each metal insert (3) is further arranged in the upper end of the barrel body (1).

2. The fuse tube according to claim 1, characterized in that each metal wire (5) has metal connecting pieces (5a) at both ends, the metal insert (3) and the metal wire (5) are fixed by screws passing through the corresponding metal connecting pieces (5a) and penetrating into the metal insert (3), and the metal wire holder (2) and the metal wire (5) are fixed by screws passing through the corresponding metal connecting pieces (5a) and penetrating into the wire outlet ends (2a) of the metal wire holder (2).

3. The fuse tube according to claim 1 or 2, characterized in that the wire inlet end (2b) of the metal wire holder (2) partially extends out of the upper end side of the tube body (1), and the upper end side of the tube body (1) is provided with a creepage shed (1a) right below the wire inlet end (2b) of the metal wire holder (2).

4. The fuse tube as claimed in claim 3, wherein the creepage shed (1a) comprises three protrusions (1a1) distributed along the axis direction of the tube body (1), the distance between the highest points of two adjacent protrusions (1a1) is equal, the wire inlet end (2b) of the metal wire holder (2) is provided with a connecting hole with internal thread, the distance between the center line of the connecting hole and the highest point of the uppermost protrusion (1a1) is equal to the distance between the highest points of the uppermost protrusion (1a1) and the lowest protrusion (1a 1).

5. The fuse tube according to claim 1 or 2, characterized in that the central position of the top of the tube body (1) is provided with a convex hull (1b), and the outer surface of the convex hull (1b) is a spherical surface.