CN220585174U

CN220585174U - Novel contact mechanism and closed fuse

Info

Publication number: CN220585174U
Application number: CN202322159810.9U
Authority: CN
Inventors: 秦军; 戴健; 朱振; 周志强; 陈凯; 张之源; 陈均
Original assignee: Shanghai Fenglian Electrical Equipment Co ltd
Current assignee: Shanghai Fenglian Electrical Equipment Co ltd
Priority date: 2023-08-11
Filing date: 2023-08-11
Publication date: 2024-03-12
Anticipated expiration: 2033-08-11

Abstract

The utility model relates to the technical field of fuses and discloses a novel contact mechanism and a closed fuse. The novel contact mechanism comprises a first connector and a second connector, wherein the first connector comprises an upper connecting seat and an upper contact which is elastically connected with the upper connecting seat through a first elastic part, the upper connecting seat and the upper contact are electrically connected through a wire, the upper contact and one end of a fusion tube form surface contact, and the upper contact and the first contact of the fusion tube are electrically connected.

Description

Novel contact mechanism and closed fuse

Technical Field

The utility model relates to the technical field of fuses, in particular to a novel contact mechanism and a closed fuse.

Background

The fuse is an electric appliance which fuses a melt by heat generated by the fuse when a power grid or electric equipment has short circuit fault or overload, and breaks a circuit. The fuse is widely applied to a high-low voltage distribution system, a control system and electric equipment, when a power grid or the electric equipment has short-circuit fault or overload, the circuit can be automatically cut off, the damage of the electric equipment is avoided, the accident is prevented from spreading, and the fuse is one of the most common protection devices when being used as a protector for short-circuit and overcurrent.

Along with the continuous rise of the reliability requirement of the fuse, most of the conventional power distribution lines are totally enclosed fuses, and the main characteristics and working principles are as follows:

(1) Working principle: the melt is fused to form an electric arc, the gas generating material in the arc extinguishing pipe is gasified instantly to generate a large amount of gas under the action of the high temperature of the electric arc, the electric arc is blown out when the current crosses zero by means of the gas, the melt pipe is pushed out by the action of a spring to form an isolation fracture, a circuit is broken, and a fault line or fault equipment is cut off.

(2) Structural features: the upper contact and the lower contact are all sealed inside the insulating base to form a totally-sealed and totally-insulating structure, and the opening for loading and unloading the fuse is arranged right below the sheath and is provided with a sealing cover to prevent foreign matters from entering.

(3) Structural design: the structural form design of the upper contact and the lower contact is adopted, and the current-carrying capacity and the breaking current tolerance are calculated and verified; designing a static contact mounting structure; the design of the insulation, mechanical strength and sealing structure of the base; the design of external insulation; the design of the fuse carrying piece contact and the installation mode, etc.

The existing closed fuse contacts are designed by adopting petal-type contact pieces, the contact pressure between the existing closed fuse contacts and the fuse carrier contacts can only be maintained by means of the elasticity of the materials of the contact pieces, the fatigue strength of the contact pieces is limited, the elasticity is easy to lose efficacy after long-time operation, the contact pressure is reduced, the contact resistance between the contact pieces and the fuse carrier contacts is increased, the contact points are easy to heat in the operation process, and the contact points are hot-melted in the short-circuit current breaking process due to overlarge resistance. In addition, the petal-shaped contact piece has poor mechanical strength, and the melt carrying piece has insufficient mechanical stability in the breaking process and is easy to burn and deform.

If the authorized bulletin number is: the chinese patent application publication CN109841465B discloses an outdoor closed fuse, which comprises a first connector, one end of the first connector is fixedly connected with the first connecting terminal, the other end of the first connector is fixedly connected with a first contact finger, the inner side wall of the first contact finger is matched with the shape of a fuse cap of a fuse tube, and is used for clamping the fuse cap, and the first connector, the first contact finger, the fuse cap and the slider are all made of metal materials, so that current is conducted sequentially through the first connecting terminal, the first connector, the first contact finger, the fuse cap, the fuse in the fuse tube body and the slider. The fuse wire is connected with the fuse wire cap through the first contact finger in a clamping way, so that an electric connection structure is formed, the electric connection structure is maintained by means of elasticity of the material of the first contact finger, the elasticity is easy to lose efficacy after long-time operation, the contact pressure is reduced, the contact resistance between the fuse wire and the fuse wire contact is increased, the contact is easy to heat in the operation process, and the contact is also hot-melted due to overlarge resistance in the short-circuit current opening process.

If the authorized bulletin number is: in the chinese patent application publication CN 208208708U, a closed fuse is disclosed, and preferably, a first fixed contact is disposed at the upper end of a first moving contact. The bottom of the first fixed contact is provided with a plurality of elastic sheets which are abutted with the first moving contact along the circumferential direction of the bottom. The fuse further comprises a second fixed contact which is arranged in a propping way with the second movable contact. The top of the second fixed contact is provided with a plurality of elastic pieces which can be abutted with the second moving contact along the circumferential direction of the second fixed contact. The utility model adopts the design of self-closing force contact. Preferably, the outer diameter of the fusion pipe is larger than the inner diameter of a cavity surrounded by a plurality of elastic sheets in a loose state of the first fixed contact and the second fixed contact, so that when the fusion pipe is inserted into the first fixed contact and the second fixed contact, the elastic sheets of the first fixed contact and the second fixed contact are expanded and deformed, and accordingly the impact of the reaction force of the elastic sheets is received, and the conductive pressure is increased. The connection mode between the first moving contact and the first fixed contact, the elasticity of the first fixed contact spring piece is easy to lose efficacy after long-time operation, the contact pressure is reduced, the contact resistance between the first moving contact and the first fixed contact is increased, the contact is easy to generate heat in the operation process, and the contact is also hot-melted due to overlarge resistance in the short-circuit current opening process. In addition, the petal type contact is insufficient in mechanical stability in the power-on and power-off process, and is easy to burn and deform.

Disclosure of Invention

The utility model aims to provide a novel contact mechanism and a closed fuse, so that contact resistance between contacts is stable, and the risk of overheat melting of the contacts caused by the increase of the contact resistance in the use process is reduced.

In order to solve the technical problems, the embodiment of the utility model provides a technical scheme as follows:

the utility model provides a novel contact mechanism, includes first connector and second connector, first connector includes the connecting seat to and go up the contact through first elastomeric element and last connecting seat elastic connection, go up and form the electricity through the wire between connecting seat and the last contact and be connected, go up the contact and form the face contact with the first contact of fusion tube one end, go up the contact and be connected with first contact electricity.

Further, the second connector comprises a lower connecting seat and an elastic contact piece fixedly arranged along the circumferential direction of the lower connecting seat, the elastic contact piece forms a cavity structure with an opening, one end of the fusion tube opposite to the first contact is provided with a second contact, and the second contact is inserted and arranged in the cavity structure.

Further, the middle part of the cavity structure is contracted inwards to form a neck, and the neck is provided with a second elastic part in a surrounding mode.

Further, a clamping groove is formed in the outer side of the neck, and the second elastic component is arranged in the clamping groove in a surrounding mode.

Further, the second elastic component is an annular spring contact finger and is used for increasing and maintaining the clamping force of the cavity structure.

Further, the upper contact can axially displace relative to the upper connecting seat under the action of the first elastic component.

Further, the one end of going up the connecting seat towards the upper contact is equipped with the boss, the one end of going up the connecting seat towards last contact is equipped with the recess, the one end cover of first elastomeric element is established on the boss, and one end holding is in the recess, two tip stops of first elastomeric element are fixed go up the opposite one end of connecting seat and upper contact.

Further, the wire is flexible, and permanent connection is formed between the wire and the upper connecting seat and between the wire and the upper contact in a crimping manner.

Further, the first elastic member is a compression spring.

The utility model also provides a technical scheme, the sealed fuse comprises an upper wiring terminal, a lower wiring terminal, a fusion pipe positioned between the upper wiring terminal and the lower wiring terminal, the novel contact mechanism, and an insulating layer which is arranged by coating a part of the novel contact mechanism, the fusion pipe, the upper wiring terminal and a part of the lower wiring terminal.

Compared with the prior art, the novel contact mechanism and the closed fuse provided by the utility model have the advantages that the upper contact and the first contact of the fusion tube are stably contacted by virtue of the elastic connection between the upper connecting seat and the upper contact and the design of the electric connection of the lead, so that the stability of the electric connection between the upper contact and the first contact of the fusion tube is improved, and the risk of overheat melting of the contact caused by the increase of contact resistance is reduced; through the design of the second elastic component, the pressure stability between the elastic contact piece and the second contact of the fusion tube is increased, the problem that the contact is heated easily due to the fact that the resistance between the elastic contact piece and the second contact is increased due to the elastic attenuation of the elastic contact piece is effectively solved, and the mechanical stability of the connection between the second connector and the fusion tube is also improved.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic view of the whole structure of a closed type fuse tube in an embodiment of the present utility model after assembly;

FIG. 2 is a schematic view of the first connector when the fusion pipe is not assembled in accordance with an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a second connector according to an embodiment of the present utility model;

fig. 4 is a schematic structural view of the second connector with the second elastic member removed in the embodiment of the present utility model.

Reference numerals illustrate: 100. a first connector; 101. an upper connecting seat; 102. an upper contact; 103. a first elastic member; 104. a wire; 200. a second connector; 201. a lower connecting seat; 202. an elastic contact; 203. a second elastic member; 204. a clamping groove; 300. a fusion pipe; 301. a first contact; 302. a second contact; 303. a fuse; 400. an upper wiring terminal; 500. a lower connection terminal; 600. an insulating layer.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present utility model more apparent, embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art will understand that in various embodiments of the present utility model, numerous technical details have been set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be realized without these technical details and various changes and modifications based on the following embodiments.

As shown in fig. 1, according to an embodiment of the present utility model, which is a schematic overall structure of a fuse tube assembled with a closed fuse, the closed fuse provided in the present utility model includes an upper terminal 400, a lower terminal 500, and a fuse tube 300 disposed between the upper terminal 400 and the lower terminal 500, wherein the upper terminal 400 is electrically connected to one end of the fuse tube 300 through a first connector 100, and the lower terminal 500 is electrically connected to the other end of the fuse tube 300 through a second connector 200, so that a circuit for communication is formed between the upper terminal 400 and the lower terminal 500, and an insulating layer 600 is coated on the periphery of the first connector 100, the fuse tube 300, the second connector 200, a portion of the upper terminal 400, and a portion of the lower terminal 500, so that the fuse has good insulation and sealing properties, and safety and stability in use of the closed fuse are increased.

As shown in fig. 1 to 4, the novel contact mechanism provided in the embodiment of the utility model includes a first connector 100 and a second connector 200, where the first connector 100 includes an upper connection seat 101, one end of the upper connection seat 101 is used for being fixedly connected with an upper connection terminal 400, the other end of the upper connection seat 101 is elastically connected with an upper contact 102 through a first elastic component 103, an electrical connection is formed between the upper connection seat 101 and the upper contact 102 through a wire 104, the upper contact 102 forms a surface contact with a first contact 301 of a fusion tube 300, and the upper contact 102 is electrically connected with the first contact 301 of the fusion tube 300.

In one embodiment, the wire 104 is made of a flexible material, and a permanent fixed connection is formed between the wire 104 and the upper connection base 101, and between the wire 104 and the upper contact 102 in a crimping manner. The one end that goes up connecting seat 101 towards last contact 102 is equipped with the boss, the one end that goes up contact 102 towards last connecting seat 101 is equipped with the recess, the one end cover of first elastomeric element 103 is established on the boss, and one end holding is in the recess, the both ends stop of first elastomeric element 103 is fixed go up connecting seat 101 and the relative one end of last contact 102. The upper contact 102 can axially displace relative to the upper connection seat 101 under the action of the first elastic component 103, so that the contact pressure between the upper contact 102 and the first contact 301 of the fusion tube 300 can be increased and maintained in the process of the mutual matching of the fusion tube 300 and the first connector 100, the contact area between the upper contact 102 and the first contact 301 is stable, and the risk of overheat melting of the contact point caused by the increase of contact resistance in the operation process is reduced; preferably, the first elastic member 103 is a compression spring, and when the fuse element 303 in the fuse tube 300 is fused, deformation of the first elastic member 103 can release to push the fuse tube 300 downwards, so that a part of the fuse tube 300 is exposed out of the base of the closed fuse, and a maintenance person can conveniently identify the state of the fuse.

The second connector 200 includes a lower connection seat 201, and an elastic contact piece 202 fixedly connected with the lower connection seat 201, where the elastic contact piece 202 is circumferentially arranged along the lower connection seat 201 to form a cavity structure with an opening, the second contact 302 of the fusion tube 300 is inserted and arranged in the cavity structure with the opening, and the elastic contact piece 202 is abutted with the second contact 302 of the fusion tube 300 to form an electrical connection. Preferably, the elastic contact 202 is riveted and fixed with the lower connecting seat 201, the middle part of the cavity structure is shrunk inwards to form a neck, the neck is provided with a clamping groove 204, a second elastic component 203 is annularly arranged along the neck clamping groove 204, preferably, the second elastic component 203 is an annular spring contact finger, and the annular spring contact finger is used for increasing and maintaining the clamping force of the cavity structure and increasing the mechanical stability of the connection between the second connector 200 and the fusion tube 300.

When the fuse element 303 in the fusion tube 300 is broken, deformation of the first elastic component 103 can be released, the upper contact 102 and the first contact 301 are pushed to axially displace synchronously, the mechanical stability is good, and burning loss and deformation are not easy to occur. The second connector 200 increases the pressure stability between the elastic contact 202 and the second contact 302 of the fusion tube 300 by adding the design of the second elastic component 203, so that the problem that the contact is easy to generate heat due to the increase of the resistance between the contact and the second contact 302 caused by the elastic attenuation of the elastic contact 202 is effectively solved, and the mechanical stability of the elastic contact 202 is also improved.

Compared with the prior art, the novel contact mechanism and the closed fuse provided by the utility model have the advantages that the upper contact and the first contact of the fusion tube are stably contacted by virtue of the elastic connection between the upper connecting seat and the upper contact and the design of the electric connection of the lead, so that the stability of the electric connection between the upper contact and the first contact of the fusion tube is improved, and the risk of overheat melting of the contact caused by the increase of contact resistance is reduced; through the design of the second elastic component, the pressure stability between the elastic contact piece and the second contact of the fusion tube is increased, the problem that the contact is heated easily due to the fact that the resistance between the contact piece and the second contact is increased due to the elastic attenuation of the contact piece is effectively solved, and the mechanical stability of the connection between the second connector and the fusion tube is also improved.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the utility model and that various changes in form and details may be made therein without departing from the spirit and scope of the utility model.

Claims

1. The utility model provides a novel contact mechanism, its characterized in that includes first connector and second connector, first connector includes the connecting seat to and go up connecting seat elastic connection's last contact through first elastomeric element, go up and form electric connection through the wire between connecting seat and the last contact, go up the contact and form the face contact with the first contact of fusion tube one end, go up the contact and be connected with first contact electricity.

2. The novel contact mechanism according to claim 1, wherein the second connector comprises a lower connecting seat and an elastic contact piece fixedly arranged along the circumferential direction of the lower connecting seat, the elastic contact piece forms a cavity structure with an opening, one end of the fusion tube opposite to the first contact is provided with a second contact, and the second contact is inserted and arranged in the cavity structure.

3. The novel contact mechanism of claim 2, wherein the central portion of the cavity structure is inwardly contracted to form a neck portion, and the neck portion is looped with a second resilient member.

4. The novel contact mechanism according to claim 3, wherein a clamping groove is formed in the outer side of the neck portion, and the second elastic component is arranged in the clamping groove in a surrounding mode.

5. A novel contact mechanism according to claim 3, wherein the second resilient member is an annular spring finger for increasing and maintaining the clamping force of the cavity structure.

6. The novel contact mechanism of claim 1, wherein the upper contact is axially displaceable relative to the upper connector under the action of the first resilient member.

7. The novel contact mechanism according to claim 6, wherein a boss is arranged at one end of the upper connecting seat facing the upper contact, a groove is arranged at one end of the upper contact facing the upper connecting seat, one end of the first elastic component is sleeved on the boss, one end of the first elastic component is accommodated in the groove, and two end parts of the first elastic component are blocked and fixed at one end of the upper connecting seat opposite to the upper contact.

8. The novel contact mechanism of claim 1, wherein the wire is a flexible material, and the permanent connection is formed between the wire and the upper connection seat and between the wire and the upper contact in a crimping manner.

9. The novel contact mechanism of claim 1, wherein the first resilient member is a compression spring.

10. The utility model provides a closed fuse, its characterized in that includes binding post and lower binding post, and is located go up binding post and lower binding post between the fusion tube, still include the novel contact mechanism of any one of claims 1-8, go up binding post and lower binding post and pass through novel contact mechanism and fusion tube formation electricity are connected, novel contact mechanism, fusion tube, go up binding post's a part and a part cladding of lower line terminal set up the insulating layer.