CN112992626A

CN112992626A - Bounce type fuse

Info

Publication number: CN112992626A
Application number: CN202110061747.8A
Authority: CN
Inventors: 段少波; 王欣; 戈西斌; 石晓光
Original assignee: Xian Zhongrong Electric Co Ltd
Current assignee: Xian Zhongrong Electric Co Ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2021-06-18

Abstract

A bounce type fuse comprises a base, an upper cover which is detachably covered on the base, and a melt and a conductive elastic piece connected with the melt are arranged in a cavity formed by the base and the upper cover; when the melt is fused, the conductive elastic part can enlarge the fusing fracture, and the melt and the two ends of the conductive elastic part are respectively connected with the conductive terminals arranged between the base and the upper cover in a penetrating way. The bouncing fuse protector is simple in structure, quick in fusing and high in arc extinguishing capability.

Description

Bounce type fuse

Technical Field

The invention relates to the field of power control and electric automobiles, in particular to a structure of a fuse for electric power, electric automobiles and the like.

Background

At present, a hot-melt fuse is generally used by an electric vehicle battery pack as a protection device of a circuit, and the structure of the hot-melt fuse comprises a contact knife, a gland, a melt, an arc extinguishing medium, a porcelain tube, a pressure cap and the like. The working principle is as follows: when the current in the line exceeds a specified value, namely when fault current occurs, the line current passes through the melt through the contact knife, and a current sensing point (narrow neck) arranged on the melt is melted and disconnected in a certain time by utilizing the current heat accumulation effect, so that the arc is extinguished, and the fault current is safely cut off.

It presents major problems and drawbacks:

1. the tube shell of the fuse usually adopts a porcelain tube, the whole weight is heavier, and under the condition of larger current, the volume of the fuse is also larger, and the application environment with high requirements on weight and volume cannot be met.

2. The general fuse can operate only when the rated current reaches more than 3 times, and the fuse cannot be fused at a later time due to the slow heat accumulation of the narrow diameter of the fuse under the current of lower multiple, the fusing time is long, and the rapid protection cannot be realized.

3. At present, fuses mostly adopt multi-row narrow-diameter melts, when the multi-row narrow-diameter fuses, because the clearance at the position of a narrow-diameter fusing point is small, the lap-joint adhesion of fusing points between different narrow diameters can occur, electric arcs can not be extinguished quickly, and the insulation performance after the fusing is not facilitated.

Disclosure of Invention

The invention aims to provide a bouncing fuse, which can bounce and draw a fusing fracture from a fusing part by an elastic piece at the fusing part after fusing, so as to facilitate rapid arc extinction.

In order to achieve the purpose, the technical scheme provided by the invention is that the bouncing fuse protector is characterized by comprising a base and an upper cover which is detachably covered on the base, wherein a melt and a conductive elastic piece connected with the melt are arranged in a cavity formed by the base and the upper cover; when the melt is fused, the conductive elastic part can enlarge the fusing fracture, and the melt and the two ends of the conductive elastic part are respectively connected with the conductive terminals arranged between the base and the upper cover in a penetrating way.

The melt, the conductive terminal and the conductive elastic piece are integrally formed.

The melt is a filamentous structure.

The conductive elastic part is integrally connected with the conductive terminals positioned on the same side of the conductive elastic part; notches are respectively formed in two sides of one end of the conductive terminal and one end of the conductive elastic part which are connected with the melt, and two ends of the melt are respectively wound and fixed on the notches; the conductive terminal and the conductive elastic piece are both of plate-shaped structures.

Vertical side walls are arranged on two sides of the base, and the upper cover is clamped between the two vertical side walls; the vertical side wall closes two sides of the upper cover; the conductive terminal is arranged between the lower end of the upper cover and the base in a penetrating way.

The lower ends of the two sides of the upper cover are provided with clamping hooks, and the upper cover is clamped on the vertical side wall through the clamping hooks.

An arc isolating plate is arranged between two vertical side walls of the base, the melt and the conductive elastic part are respectively positioned at two sides of the arc isolating plate, and the conductive elastic part extends through the upper end of the arc isolating plate to be connected with the melt; and a gap for the conductive elastic piece to rebound is reserved between the upper end of the flash barrier and the top of the upper cover.

The upper cover is made of transparent material.

The bouncing fuse protector adopts the conductive elastic part to be connected with the fuse body, and when the bouncing fuse protector is fused, the formation of a fuse fracture of the fuse body is accelerated under the elastic action of conductive elastic force, and the fuse fracture is enlarged, so that the fusing time is shortened, and the arc extinguishing capability is improved; the upper cover is of an external buckle type structure, and forms a relatively closed cavity with the base, so that electric arcs generated during breaking are prevented from flying outside the product. The base has the flash barrier in the middle part, and both sides electric arc splashes when avoiding fusing and leads to the short circuit state. The lower end of the upper cover is matched with the base in shape, and the assembly and the positioning are realized through the flash barrier in the middle of the base. The upper cover can be made of transparent materials, and the product state can be conveniently observed, such as whether the product is fused or not. The upper cover and the base are connected by the clamping hook, so that the assembly and disassembly are convenient, and only the conductive elastic piece can be replaced after the fuse.

Drawings

FIG. 1 is a schematic diagram of an explosion structure of a pop-up fuse.

FIG. 2 is a schematic cross-sectional view of the pop-up fuse.

FIG. 3 is a schematic cross-sectional view of a pop-up fuse after fuse disconnection

FIG. 4 is a schematic view of a structure of a linear melt and a conductive elastic member.

Detailed Description

With respect to the above technical solutions, preferred embodiments will be described in detail with reference to the drawings. Referring to fig. 1-4, wherein:

the base 10, rectangular platelike structure is provided with vertical lateral wall 11 at the relative both sides parallel interval of base, is provided with flash barrier 12 on the base between vertical lateral wall, and the flash barrier is connected with two vertical lateral walls. The upper surface of the base at two sides of the flash barrier is provided with a limit groove 13 for placing a conductive terminal. Fixing holes 14 for fixing the conductive terminals are respectively formed at two ends of the limiting groove. Bayonets 15 penetrating through the vertical side walls are respectively arranged on two sides of the two vertical side walls, and the bayonets on the two vertical side walls on the same side are the same in size and position.

The upper cover 20 is made of transparent materials, the width of the upper cover is equal to the distance between the two vertical side walls, an open groove 21 for the arc isolation plate to penetrate is formed in the position of the opposite arc isolation plate of the side wall of the upper cover, and clamping hooks 22 are arranged on the two sides of the end heads at the two ends of the upper cover and on the bayonet of the opposite vertical side walls. After the upper cover is clamped on the vertical side wall of the base, the vertical side wall can seal two sides of the upper cover. In order to conveniently take and place the upper cover, a plurality of convex ribs 23 are correspondingly arranged on the outer side surfaces of the two ends of the upper cover, so that the upper cover can be conveniently held by hands to take and place.

The conductive terminal 30 is a flat structure, and the shape of the conductive terminal is matched with that of the limiting groove 13 on the base. One end of the conductive terminal 30 is opened with a through hole 31 corresponding to the fixing hole 14. Two conductive terminals 30 are respectively placed in the limiting grooves 13 on the base at the two sides of the arc isolating plate 12, one end of each conductive terminal is positioned in the upper cover, and the other end of each conductive terminal is positioned outside the upper cover. One end of the conductive elastic part 40 is integrally connected with one end of the conductive terminal in the upper cover, the other end of the conductive elastic part extends through the upper end of the flash barrier after being bent and is fixedly connected with one end of the melt 50 positioned on the other side of the flash barrier, and the other end of the melt is fixedly connected with one end of the conductive terminal on the same side of the melt.

The melt may be a plate-shaped structure integrally connected with the conductive terminal and the conductive elastic member, which is shown in fig. 1 to 3. The fuse element may be a single wire-like structure, and referring to fig. 4, the conductive terminals 60 and the wire-like fuse element 70 located on the same side of the arc-isolating plate are separate parts, and the conductive terminals are plate-like. The conductive elastic member 80 located at the other side of the arc-isolating plate and the conductive terminal 90 are integrally connected to form a plate-shaped structure. The conductive elastic element 80 and the conductive terminal 60 are respectively provided with notches (81, 61) at two sides of the end connected with the linear melt for winding and fixing the linear melt.

Assembling the fuse: placing two conductive terminals in the limit grooves on the base at two sides of the flash barrier respectively, so that one end of the conductive elastic part extends through the upper end of the flash barrier and is connected with the melt into a whole; then the upper cover is buckled between two vertical side walls of the base, the flash barrier is embedded into the open slot 21 of the upper cover, and the hook of the upper cover is clamped at the bayonet on the vertical side walls.

The upper cover is of an external buckle type structure, and forms a relatively closed cavity with the base, so that electric arcs generated during breaking are prevented from flying outside the product. The base has the flash barrier in the middle part, and both sides electric arc splashes when avoiding fusing and leads to the short circuit state. The lower end of the upper cover is matched with the base in shape, and the assembly and the positioning are realized through the flash barrier in the middle of the base. The upper cover can be made of transparent materials, and the product state can be conveniently observed, such as whether the product is fused or not. The upper cover and the base are connected by the clamping hook, so that the assembly and disassembly are convenient, and only the conductive elastic piece can be replaced after the fuse.

After the fuse is assembled, the conductive elastic part is in a bending compression state when the fuse body is not fused; when the melt is fused, the formation of the fused fracture can be accelerated due to the stretching elasticity of the conductive elastic part, after the fused fracture is formed, the fracture at the fused part is enlarged under the action of the conductive elastic part, the electric arc at the fracture is elongated, the arc resistance is increased, the fault current is reduced to be difficult to hold the arc, the electric arc is completely extinguished, and the fault current is cut off.

Claims

1. A bounce fuse is characterized by comprising a base, an upper cover which is detachably covered on the base, and a melt and a conductive elastic piece connected with the melt are arranged in a cavity formed by the base and the upper cover; when the melt is fused, the conductive elastic part can enlarge the fusing fracture, and the melt and the two ends of the conductive elastic part are respectively connected with the conductive terminals arranged between the base and the upper cover in a penetrating way.

2. The pop-up fuse of claim 1, wherein the fuse body, the conductive terminal, and the conductive resilient member are integrally formed.

3. The pop-up fuse of claim 1, wherein the fuse element is a filamentary structure.

4. The pop-up fuse of claim 3, wherein said conductive spring member is integrally connected to said conductive terminals on the same side thereof; notches are respectively formed in two sides of one end of the conductive terminal and one end of the conductive elastic part which are connected with the melt, and two ends of the melt are respectively wound and fixed on the notches; the conductive terminal and the conductive elastic piece are both of plate-shaped structures.

5. The pop-up fuse of claim 1, wherein said base has vertical sidewalls disposed on opposite sides thereof, and said top cover is captured between said vertical sidewalls; the vertical side wall closes two sides of the upper cover; the conductive terminal is arranged between the lower end of the upper cover and the base in a penetrating way.

6. The pop-up fuse as claimed in claim 4, wherein hooks are provided at lower ends of both sides of the upper cover, and the upper cover is hooked on the vertical side walls by the hooks.

7. The pop-up fuse as recited in claim 1, wherein an arc barrier is disposed between two vertical sidewalls of said base, said fuse element and said conductive elastic member are disposed on two sides of said arc barrier, respectively, said conductive elastic member extends over an upper end of said arc barrier to connect with said fuse element; and a gap for the conductive elastic piece to rebound is reserved between the upper end of the flash barrier and the top of the upper cover.

8. The pop-up fuse of claim 1, wherein said cover is made of a transparent material.