CN213401074U

CN213401074U - Fuse capable of ensuring centered melt

Info

Publication number: CN213401074U
Application number: CN202022742055.3U
Authority: CN
Inventors: 陈聪莉; 赵希华
Original assignee: Xi'an Suyuan Electric Power Equipment Co ltd
Current assignee: Xi'an Suyuan Electric Power Equipment Co ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-06-08
Anticipated expiration: 2030-11-24

Abstract

The utility model belongs to the technical field of fuses, and relates to a fuse for ensuring the melt to be placed in the middle, which comprises a tube shell, a melt, an inner cap, an outer cap and arc extinguishing filler, wherein the end face of the inner cap is provided with a melt through hole and a filler hole, the inner hole wall of the outer cap is a second-order step hole which is gradually reduced from outside to inside, the second-order step hole of the inner wall of the outer cap is divided into a first step hole and a second step hole from outside to inside, the inner wall of the first step hole is provided with an internal thread, the axial depth of the second step hole is not less than the axial height of the inner cap, the inner diameter of the second step hole is equal to the outer diameter of the inner cap, the outer circumferences of the two ends of the tube shell are provided with external threads matched with the internal thread, the melt is in a flaky strip shape, the two ends of the melt are respectively buckled and buckled on the outer end face of the inner cap, the mode of adopting outer cap threaded connection tube shell is more reliable convenient and fast than before.

Description

Fuse capable of ensuring centered melt

Technical Field

The utility model belongs to the fuse field relates to a ensure fuse-element fuse placed in the middle.

Background

The fuse is an electric appliance which fuses a melt by heat generated by itself to open a circuit when a current exceeds a predetermined value. The fuse melts the melt by the heat generated by the fuse after the current exceeds a specified value for a period of time, so as to cut off the circuit; a current protector is made by applying the principle. The fuse is widely applied to high and low voltage distribution systems, control systems and electric equipment, and is one of the most commonly applied protection devices as a short circuit and overcurrent protector.

The fuse basically has a structure that end caps are sleeved at two ends of a tube shell, a fuse body is connected between the end caps, and fuse filler is filled between the fuse body and the inner wall of the tube shell. In the existing fuse processing process, the common method is to fix the melt in the fuse tube shell, then encapsulate, and fill arc-extinguishing material into the fuse tube shell through a filling port at one end after encapsulation. The fuse body is of a slender structure, and two ends of the fuse body are respectively fixed on one side of the end wall of the fuse tube shell. Thus, during filling, the arc quenching material presses the melt against the inner wall of the fuse housing. When the fuse body generates heat, the fuse tube shell is easy to burst due to the heat generated by the fuse body, and for the fuse with higher voltage and slender tube shell, the phenomenon of burst due to the fact that the fuse body is close to the inner wall of the fuse tube shell is particularly serious. It has been a problem how to avoid the occurrence of cracking due to the melt approaching the inner wall of the vessel.

Disclosure of Invention

The utility model aims to solve the technical problem that a fuse-element is ensured placed in the middle is provided for the fuse-element can not take place to be close to and hug closely the condition of pipe wall even, therefore has good electrical property, security performance.

The utility model provides a technical scheme that technical problem took is: a fuse ensuring the melt to be centered comprises a tube shell 1, a melt 2, an inner cap 3, an outer cap 4 and arc extinguishing filler 5, wherein the inner cap 3 and the outer cap 4 are respectively sleeved at two ends of the tube shell 1 from inside to outside in sequence, a melt through hole 6 and a filler hole 7 are arranged on the end surface of the inner cap 3, the inner hole wall of the outer cap 4 is a two-step hole type which is sequentially reduced from outside to inside along the axial direction, the two-step hole on the inner wall of the outer cap 4 is divided into a first step hole 8 and a second step hole 9 from outside to inside, the inner wall of the first step hole 8 is provided with an internal thread 10, the axial depth of the second step hole 9 is not less than the axial height of the inner cap 3, the inner diameter of the second step hole 9 is equal to the outer diameter of the inner cap 3, external threads 11 matched with the internal thread 10 are arranged at two ends of the tube shell 1, the melt 2 is in a flaky elongated shape, the melt 2 extends out of, the outer cap 4 is screwed with the end of the pipe shell 1 through the internal thread 10 and the external thread 11 and fastens and presses the inner cap 3 on the end of the pipe shell 1.

Preferably, the part of the melt 2 extending out of the outer end face of the inner cap 3 is in an open double-fork shape.

Preferably, the fork heads of the opening bifurcations of the melt 2 are respectively reversely bent and buckled on the outer end face of the inner cap 3.

Preferably, the bending positions of the two ends of the melt 2 are provided with bending lines 12.

Preferably, the sheet-like strip of the melt 2 is provided with a plurality of melt holes 13.

Preferably, the edge of the sheet-like strip of melt 2 is provided with a plurality of concave arcs 14.

Preferably, the second stepped hole 9 and the inner cap 3 are in interference fit.

Preferably, the arc-extinguishing filler 5 comprises quartz sand.

The utility model has the advantages that:

1. the utility model discloses a set up fuse-element clearing hole and filled hole at interior cap terminal surface, before filling the arc extinguishing filler, buckle the hasp with the fuse-element both ends including cap both ends face, make the fuse-element body receive balanced two opposite direction pulling forces at both ends, straighten the fuse-element between two parties, then fill the arc extinguishing filler, guaranteed that the arc extinguishing filler in-process fuse-element can not produce the condition emergence that a lopsidedness is close to the fuse-element tube, consequently the utility model discloses longer life has to and better security performance.

2. The utility model discloses an adopt the fuse-element both ends to stretch out the outer terminal surface part of interior cap and be the opening bifurcate type, and with the prong of bifurcate reverse buckle the outer terminal surface of cap in the hasp respectively, and be equipped with the line of buckling that local size reduces in the department of buckling, make the outer terminal surface of the back fuse-element of buckling angle and interior cap laminate more, set up to interference fit between the second step hole of outer cap and interior cap simultaneously, can fasten firm extrusion interior cap and fuse-element after having guaranteed outer cap threaded connection tube, guaranteed the electric conductivity of outer cap, fuse-element, interior cap, consequently, the utility model discloses better electrical property has.

3. The utility model discloses a mode of outer cap threaded connection tube realizes the connection of outer cap and tube, and more reliable convenient and fast than pressfitting in the past, connected modes such as bonding, consequently, the utility model discloses better production efficiency has.

Drawings

FIG. 1 is an axial cross-sectional view of an end of a fuse to ensure melt centering;

FIG. 2 is a schematic perspective view of a fuse;

FIG. 3 is a schematic view of a melt;

FIG. 4 is a schematic view of melt bending.

In the figure: 1. a pipe shell; 2. melting the materials; 3. an inner cap; 4. an outer cap; 5. an arc suppressing filler; 6. the melt passes through the holes; 7. a filler hole; 8. a first stepped bore; 9. a second stepped bore; 10. an internal thread; 11. an external thread; 12. a bending line; 13. a fusion hole; 14. a circular arc.

Detailed Description

The related art in the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is to be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 4, a fuse ensuring a melt centered includes a tube shell 1, a melt 2, an inner cap 3, an outer cap 4, and an arc extinguishing filler 5, wherein the inner cap 3 and the outer cap 4 are respectively sleeved on two ends of the tube shell 1 from inside to outside in sequence, a melt through hole 6 and a filler hole 7 are arranged on an end surface of the inner cap 3, an inner hole wall of the outer cap 4 is a second-step hole type which is sequentially reduced from outside to inside along an axial direction, the second-step hole on an inner wall of the outer cap 4 is divided into a first step hole 8 and a second step hole 9 from outside to inside, an inner thread 10 is arranged on an inner wall of the first step hole 8, an axial depth of the second step hole 9 is not less than an axial height of the inner cap 3, an inner diameter of the second step hole 9 is equal to an outer diameter of the inner cap 3, outer circumferences of two ends of the tube shell 1 are provided with outer threads 11 matching with the inner thread 10, the melt 2 is in a sheet-like elongated shape, the outer cap 4 is in threaded connection with the end of the tube shell 1 through the inner thread 10 and the outer thread 11 and tightly presses the inner cap 3 at the end of the tube shell 1 in a buckling mode, the firm extrusion of the inner cap and the melt is achieved through threaded connection of the outer cap and the tube shell, and the conductivity of the outer cap, the melt and the inner cap is guaranteed.

Further, the part of the melt 2 extending out of the outer end face of the inner cap 3 is in an opening double-fork shape.

Furthermore, the fork heads of the opening bifurcations of the melt 2 are respectively reversely bent and buckled on the outer end surface of the inner cap 3.

Furthermore, bending lines 12 are arranged at the bending positions of the two ends of the melt 2.

Furthermore, a plurality of melt holes 13 are formed on the sheet-shaped strip of the melt 2.

Further, the edge of the sheet-like strip of the melt 2 is provided with a plurality of concave arcs 14.

Further, the second stepped hole 9 and the inner cap 3 are in interference fit.

Further, the arc extinguishing filler 5 includes quartz sand.

Example (b):

in this embodiment, fuse tube 1 is rectangular tubular structure, establishes interior cap 3 at the both ends cover of fuse tube 1, establishes outer cap 4 in the outside cover of interior cap 3. The inner cap 3 has a melt passage opening 6 in its end face, which is circular in the present exemplary embodiment, for the melt 2 to pass out of the fuse housing 1. The melt 2 passes through the fuse tube shell 1 and the melt through hole 6 on the inner cap 3, and then the two ends are buckled on the outer end face of the inner cap 3. The fuse housing 1 is then filled with an arc-extinguishing material 5. Wherein, the melt 2 is a sheet-shaped strip-shaped structure. Symmetrical inward-sunken circular arcs 14, namely arc edges, are arranged on two long side edges of the melt 2 body at intervals, and the melt holes 13 are arranged on the melt 2 where each group of symmetrical arc edges are arranged. Each set of the arc 14 and hole 13 structure may first melt as a weak point of the melt 2 when the circuit is overloaded. Two ends of the melt 2 are respectively made into an opening double fork type. Be equipped with the bend line 12 in 2 punishment in fuse-element, can follow the orderly bending of bend line 12 when 2 both ends of fuse-element are buckled, guarantee that the back fuse-element 2 of buckling is laminated with the outer terminal surface of interior cap 3 more. Because the kink branch at 2 both ends of fuse-element is bent the back and is fixed to opposite direction, produce the pulling force of two opposite directions to 2 bodies of fuse-element, these two-phase opposite direction's pulling force equals, make 2 bodies of fuse-element receive the equal pulling force that comes from two opposite directions, under the pulling force effect of this equilibrium, 2 bodies of fuse-element then can be stretched out straightly, thereby avoid filling arc extinguishing filler 5 before back fuse-element 2 to any direction slope in fuse tube 1, and then guarantee can not cause because of 2 contact tubes 1 of fuse-element explodes the phenomenon of splitting. After the arc extinguishing filler 5 is filled, the outer cap 4 is in threaded connection with the tube shell 1, the outer cap 4 is firmly fastened to extrude the inner cap 3 and the melt 1 along with the gradual screwing of the threaded connection, and the conductivity of the outer cap 4, the melt 2 and the inner cap 3 and the centering performance of the melt are guaranteed.

To sum up, the utility model provides an ensure fuse-element fuse placed in middle, the fuse-element in the past has better fuse-element and occupies neutrality, has avoided appearing exploding the condition emergence of splitting because of the fuse-element is close to fuse tube inner wall, simultaneously, adopts the mode of outer cap threaded connection tube more reliable convenient and fast in the past, consequently the utility model discloses possess extensive application prospect.

It is to be emphasized that: the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form, and any simple modifications, equivalent changes and modifications made by the technical spirit of the present invention to the above embodiments are all within the scope of the technical solution of the present invention.

Claims

1. A fuse capable of ensuring centered melt comprises a tube shell (1), a melt body (2), an inner cap (3), an outer cap (4) and arc extinguishing filler (5), wherein the inner cap (3) and the outer cap (4) are respectively sleeved at two ends of the tube shell (1) from inside to outside in sequence, the fuse is characterized in that a melt body passing hole (6) and a filler hole (7) are formed in the end face of the inner cap (3), an inner hole wall of the outer cap (4) is a two-step hole type which is sequentially reduced from outside to inside along the axial direction, the two-step hole on the inner wall of the outer cap (4) is divided into a first step hole (8) and a second step hole (9) from outside to inside, an internal thread (10) is formed in the inner wall of the first step hole (8), the axial depth of the second step hole (9) is not less than the axial height of the inner cap (3), and the inner diameter of the second step hole (9) is equal to the, the outer circumference at tube shell (1) both ends be equipped with external screw thread (11) that internal thread (10) match, fuse-element (2) are slice rectangular type, fuse-element (2) stretch out tube shell (1) back both ends through fuse-element clearing hole (6) buckle respectively the hasp outer terminal surface at interior cap (3), outer cap (4) are through the tip of internal thread (10), external screw thread (11) threaded connection tube shell (1) and compress tightly the tip at tube shell (1) with interior cap (3) lock.

2. A fuse ensuring melt centring as claimed in claim 1, characterized in that the part of the melt (2) protruding beyond the outer end face of the inner cap (3) is of the split double-pronged type.

3. A fuse element as claimed in claim 2, characterized in that the split ends of the split bifurcations of the fuse element (2) are respectively snapped back on the outer end face of the inner cap (3).

4. A fuse element as claimed in claim 1, characterized in that the bends at the ends of the fuse element (2) are provided with bend lines (12).

5. A fuse element as claimed in claim 1, characterized in that the melt (2) is provided with a plurality of fuse holes (13) in the strip.

6. A fuse element as claimed in claim 1, characterized in that the edges of the strip of the fuse element (2) are provided with a plurality of concave arcs (14).

7. A fuse ensuring melt centring as claimed in claim 1, characterised in that the second stepped bore (9) is an interference fit with the inner cap (3).

8. A fuse ensuring melt centring as claimed in claim 1, characterized in that the arc suppressing filler (5) comprises quartz sand.