CN111986963A

CN111986963A - Short-circuit protection fuse

Info

Publication number: CN111986963A
Application number: CN202010918655.2A
Authority: CN
Inventors: 赵丽丽
Original assignee: Zhejiang Shengna Intelligent Technology Co Ltd
Current assignee: Zhejiang Shengna Intelligent Technology Co Ltd
Priority date: 2020-09-04
Filing date: 2020-09-04
Publication date: 2020-11-24

Abstract

The invention discloses a short-circuit protection fuse, which comprises a shell, wherein a first electric connecting plate and a second electric connecting plate are respectively fixed on two symmetrical inner walls of the shell, the side wall of the second electric connecting plate is connected with a reset plate through a short-circuit spring, a delay block is fixed on the side wall of the first electric connecting plate, a sliding groove is formed in the side wall of the delay block in a penetrating mode, the side wall of the first electric connecting plate is connected with a sliding block located in the sliding groove through an extrusion spring, and the sliding block is connected with the inner wall of the sliding groove in a sealing and sliding mode. Has the advantages that: through setting up out liquid hole and backward flow hole for the slider will promote the inside fluid of spout when circuit fault removes and enter into the stock solution chamber through going out the liquid hole, when making the slider reset, need take the fluid in the stock solution chamber out for balanced atmospheric pressure, make during fluid gets back to the spout through the backward flow hole, and the aperture in backward flow hole is less, and fluid backward flow speed is slow, therefore the slider resets and needs certain time, gives the user sufficient time to handle the overload.

Description

Short-circuit protection fuse

Technical Field

The invention relates to the technical field of power equipment, in particular to a short-circuit protection fuse.

Background

The fuse is widely applied to high-low voltage distribution systems, control systems and electric equipment, is used as a short-circuit and overcurrent protector, and is one of the most commonly applied protective devices;

the existing fuse is divided into a disposable fuse and a recoverable fuse, power-off action is realized by heating, certain response time is needed, the disposable fuse needs to be frequently replaced by a fuse wire for use, the recoverable fuse can automatically recover after the temperature is reduced, different actions cannot be performed according to overload and short circuit, and the short circuit still can automatically recover to bring strong impact to a circuit, so that the circuit is seriously damaged.

Disclosure of Invention

The invention aims to solve the problem of limited protection effect of a fuse in the prior art, and provides a short-circuit protection fuse.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a short-circuit protection fuse, includes the shell, the bisymmetry inner wall of shell is fixed with first electroplax and second respectively and connects the electroplax, the second connects the lateral wall of electroplax to have the board that resets through short circuit spring coupling, the lateral wall of first electroplax is fixed with the delay block, the lateral wall of delay block runs through and has seted up the spout, the lateral wall of first electroplax has the slider that is located the spout inside through extrusion spring coupling, slider and the sealed sliding connection of spout inner wall, the stock solution chamber has been seted up to the inside of delay block, the lateral wall in stock solution chamber runs through and sets up liquid outlet hole and the backward flow hole with the inside intercommunication of spout, the inner wall of shell is fixed with the short-circuit pipe, the inside short-circuit limiting mechanism that is equipped with of short-circuit.

In foretell short-circuit protection fuse, short-circuit limiting mechanism is including the fixed plate that is fixed in the short-circuit tube inner wall, the inlet port has been seted up in the lateral wall of fixed plate run through, the inner wall of inlet port is fixed with the check valve, the inner wall sealing sliding connection of short-circuit tube has the slide, the one end that the fixed plate was kept away from to the slide is fixed with the push pedal of "L" shape, the push pedal all offsets with board and the slider that resets.

In the short-circuit protection fuse, an exhaust pipe communicated with the inside of the short-circuit pipe is inserted through the outer wall of the housing, and a sealing plug is abutted against the inner wall of the exhaust pipe.

In foretell short-circuit protection fuse, it all is equipped with the check valve and leads to conversely to go out liquid hole and return current hole inside, the aperture of return current hole is less than out the liquid hole.

Compared with the prior art, the invention has the advantages that:

1. according to the invention, the short-circuit spring and the extrusion spring are arranged, so that when the overload current of the circuit is increased, the short-circuit spring and the extrusion spring are instantaneously contracted, the reset plate is separated from the sliding block, the whole circuit is quickly disconnected, the circuit damage is quickly avoided in response, and the service life of the circuit is prolonged;

2. according to the invention, the liquid outlet hole and the backflow hole are arranged, so that when the sliding block moves due to a circuit fault, oil liquid in the sliding chute is pushed to enter the liquid storage cavity through the liquid outlet hole, when the sliding block is reset, the oil liquid in the liquid storage cavity needs to be pumped out in order to balance air pressure, the oil liquid returns to the sliding chute through the backflow hole, the aperture of the backflow hole is small, the oil liquid backflow speed is low, and therefore, a certain time is required for resetting the sliding block, namely, a certain time is required for circuit restoration, and a user is given enough time to handle overload;

3. in the invention, after the circuit is disconnected due to overload, the sliding block is slowly reset under the action of the elastic force of the extrusion spring, and the reset plate is reset under the action of the elastic force of the short-circuit spring, so that the reset plate and the sliding block are propped against the push plate again, an external circuit is automatically restored without human intervention, the self loss is avoided, and the service life is long;

4. in the invention, when a short circuit occurs in the circuit, the current in the circuit is increased rapidly, so that the air between the fixed plate and the sliding plate is punctured and expanded, the sliding plate drives the push plate to move, and meanwhile, the external air is sucked in, so that the sliding plate cannot be automatically reset, the push plate and the sliding block are thoroughly separated, the power supply of an external circuit cannot be restored, the short circuit high current is prevented from impacting the circuit, and the purpose of protecting the circuit is achieved.

Drawings

Fig. 1 is a schematic structural diagram of a short-circuit protection fuse according to the present invention;

fig. 2 is a schematic structural diagram of another state of the short-circuit protection fuse according to the present invention.

In the figure: the device comprises a shell 1, a first electric board 2, a second electric board 3, a short circuit spring 4, a reset board 5, a delay block 6, a sliding chute 7, an extrusion spring 8, a sliding block 9, a short circuit pipe 10, a fixed board 11, a sliding board 12, a push board 13, an air inlet 14, an exhaust pipe 15, a closed plug 16, a liquid storage cavity 17, a liquid outlet 18 and a backflow hole 19.

Detailed Description

The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

Examples

Referring to fig. 1-2, a short-circuit protection fuse, including shell 1, the two symmetrical inner walls of shell 1 are fixed with first electroplax 2 and second electroplax 3 respectively, the lateral wall that the second connects electroplax 3 is connected with reset plate 5 through short-circuit spring 4, the lateral wall that first electroplax 2 is fixed with delay block 6, the lateral wall of delay block 6 runs through and has seted up spout 7, the lateral wall that first electroplax 2 is connected with the slider 9 that is located spout 7 inside through extrusion spring 8, slider 9 and spout 7 inner wall sealing sliding connection, stock solution chamber 17 has been seted up to the inside of delay block 6, the lateral wall of stock solution chamber 17 runs through and sets up play liquid hole 18 and backward flow hole 19 with the inside intercommunication of spout 7, the inner wall of shell 1 is fixed with short-circuit pipe 10, the inside short-circuit limiting mechanism that is equipped with of short-circuit pipe 10.

The short circuit limiting mechanism comprises a fixing plate 11 fixed on the inner wall of the short circuit pipe 10, an air inlet 14 penetrates through the side wall of the fixing plate 11, a one-way valve is fixed on the inner wall of the air inlet 14, the inner wall of the short circuit pipe 10 is connected with a sliding plate 12 in a sealing and sliding mode, the fixing plate 11 partitions the inner space of the short circuit pipe 10, the fixing plate 11 and the sliding plate 12 are connected into a circuit to form a parallel plate capacitor, the parallel plate capacitor can be punctured to enable the air inside the parallel plate capacitor to expand when the circuit is in a short circuit fault, an L-shaped push plate 13 is fixed at one end of the sliding plate 12, which is far; the outer wall of shell 1 runs through to insert and is equipped with the blast pipe 15 with the inside intercommunication of short circuit pipe 10, and blast pipe 15 inner wall offsets there is closing plug 16, and closing plug 16 blocks up blast pipe 15, will suck the outside air when slide 12 removes for the outside air passes through inlet port 14 and enters into the two clearance department, and can't directly discharge, makes slide 12 remove the back and can't directly reset, makes and keeps the open circuit state after the short circuit.

Go out

liquid hole

18 and 19 inside check valves that all are equipped with of backward flow hole and lead to conversely, the aperture of backward flow hole 19 is less than out liquid hole 18 for during the pressurized that the inside fluid of spout 7 can be relaxed enters into stock solution chamber 17, and the fluid in stock solution chamber 17 will need longer time when getting back to spout 7 through backward flow hole 19, make slider 9 can shift fast but need the certain time just to reset, give user's time and handle overload problem.

In the invention, when the circuit normally works, the push plate 13 is abutted against the slide block 9 and the reset plate 5, so that an external circuit is in a communicated use state, in the state, the inside of the chute 7 is filled with hydraulic oil, the inside of the liquid storage cavity 17 is in an unfilled state, the fixed plate 11 and the sliding plate 12 are respectively communicated with a circuit through a lead and the push plate 13, so that the fixed plate 11 and the sliding plate 12 form a parallel plate capacitor, and the intermediate medium is air;

when the circuit current is increased due to overload of an external circuit, the short circuit spring 4 and the extrusion spring 8 both shrink to a certain degree due to the increase of the current, so that the reset plate 5 and the slide block 9 move to be separated from the push plate 13, the external circuit is well disconnected, safety accidents caused by damage to the circuit due to overload are avoided, hydraulic oil in the chute 7 can easily enter the liquid storage cavity 17 due to the large aperture of the liquid outlet hole 18, the extrusion spring 8 shrinks to drive the slide block 9 to move without being blocked excessively, meanwhile, the hydraulic oil in the chute 7 can be extruded into the liquid storage cavity 17, after power failure, the extrusion spring 8 can restore to deform to push the slide block 9 to reset, due to the existence of external air pressure, the hydraulic oil in the liquid storage cavity 17 needs to be pumped into the chute 7 in the resetting process of the slide block 9, and accordingly, smooth movement of the difference of internal and external pressure is compensated, therefore, the resetting speed of the sliding block 9 depends on the speed of hydraulic oil entering the sliding groove 7, the aperture of the liquid outlet hole 18 is small, the transferring speed of the hydraulic oil is limited, the sliding block 9 needs a certain time to reset, and finally the sliding block 9 resets to conduct an external circuit again, so that overload power-off protection is formed, a protection mechanism for automatically recovering power supply after a certain time is formed, timely protection can be realized, manual repair and replacement are not needed, and sufficient time is provided for a user to deal with the overload problem;

when the short circuit fault occurs in the circuit, the current in the circuit will be suddenly increased instantly, so that the parallel plate capacitor is broken down, that is, the air between the fixed plate 11 and the sliding plate 12 is broken down and expanded, so that the sliding plate 12 slides towards the side far away from the fixed plate 11 under the pushing of the gas, so that the external air is sucked through the air inlet hole 14 and supplemented into the gap between the fixed plate and the sliding plate, the movement of the sliding plate 12 will drive the push plate 13 to move, the air in the gap between the fixed plate 11 and the sliding plate 12 cannot be discharged due to the blocking plug 16 blocking the exhaust pipe 15, so that the distance between the sliding plate 12 and the fixed plate 11 will be kept unchanged, that the push plate 13 cannot be reset after being moved, and due to the sudden increase of the current, both the short circuit spring 4 and the extrusion spring 8 will contract, so that the reset plate 5 moves, and the displacement of the push plate 13, and then make whole circuit form the outage that lasts after the short circuit, can not automatic recovery, avoid the short circuit to strike destruction circuit, arouse the conflagration, after handling the short-circuit fault for the user, open closing plug 16 and can discharge the unnecessary air in fixed plate 11 and slide 12 clearance for slide 12 and push pedal 13 reset, thereby make reset plate 5 reset, make whole circuit resume the circular telegram.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. A short-circuit protection fuse comprises a shell (1) and is characterized in that a first electric connection plate (2) and a second electric connection plate (3) are fixed on two symmetrical inner walls of the shell (1) respectively, a reset plate (5) is connected to the side wall of the second electric connection plate (3) through a short-circuit spring (4), a delay block (6) is fixed on the side wall of the first electric connection plate (2), a sliding groove (7) is formed in the side wall of the delay block (6) in a penetrating mode, a sliding block (9) located inside the sliding groove (7) is connected to the side wall of the first electric connection plate (2) through an extrusion spring (8), the sliding block (9) is connected with the inner wall of the sliding groove (7) in a sealing and sliding mode, a liquid storage cavity (17) is formed in the delay block (6), a liquid outlet hole (18) and a backflow hole (19) which are communicated with the inside of the sliding groove (7) are formed in a penetrating mode, the inner wall of shell (1) is fixed with short-circuit tube (10), short-circuit tube (10) inside is equipped with short-circuit limiting mechanism.

2. The short-circuit protection fuse as claimed in claim 1, wherein the short-circuit limiting mechanism comprises a fixing plate (11) fixed to an inner wall of the short-circuit tube (10), an air inlet (14) is formed through a side wall of the fixing plate (11), a one-way valve is fixed to the inner wall of the air inlet (14), a sliding plate (12) is connected to the inner wall of the short-circuit tube (10) in a sealing and sliding manner, an L-shaped push plate (13) is fixed to one end, far away from the fixing plate (11), of the sliding plate (12), and the push plate (13) abuts against both the reset plate (5) and the sliding block (9).

3. A short-circuit protection fuse as per claim 2, characterised in that the outer wall of the casing (1) is inserted through an exhaust pipe (15) communicating with the inside of the short-circuit tube (10), the inner wall of the exhaust pipe (15) bearing against a closing plug (16).

4. A short-circuit protection fuse as claimed in claim 1, characterized in that the exit opening (18) and the return opening (19) are each provided with a one-way valve and open to the opposite, the return opening (19) having a smaller diameter than the exit opening (18).