CN111463084A

CN111463084A - Recoverable fuse with short circuit prevention and overload prevention functions

Info

Publication number: CN111463084A
Application number: CN202010308363.7A
Authority: CN
Inventors: 张春丽; 冷辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-04-18
Filing date: 2020-04-18
Publication date: 2020-07-28

Abstract

The invention discloses a recoverable fuse with short circuit prevention and overload prevention functions, which comprises a shell, wherein two side walls of the shell are respectively provided with a positive pole column and a negative pole column, the side wall of the positive pole column, which is positioned in the shell, is fixedly connected with a resistance wire through a conducting wire, the inner wall of the shell is connected with a movable plate in a sealing sliding manner, the side wall of the movable plate, which is far away from one end of the positive pole column, is fixedly connected with a connecting rod, the inner wall of the shell is fixedly connected with two guide plates, one ends of the two guide plates, which are far away from the inner wall of the shell, are jointly and fixedly connected with a control box, the side wall of the control box, which is far away from one end of the. The invention can realize the on-off of the fuse according to different circuit faults, is convenient to use and saves the economic cost.

Description

Recoverable fuse with short circuit prevention and overload prevention functions

Technical Field

The invention relates to the technical field of power equipment, in particular to a recoverable fuse with short circuit prevention and overload prevention functions.

Background

In an electric power system, in order to protect electric equipment from being damaged when a circuit fails, fuses are generally provided, and conventional fuses are roughly divided into two types, namely, an unrecoverable disposable fuse and a recoverable fuse, but the two types of fuses have the following problems:

1. for a disposable fuse, when a circuit fails, the circuit can be disconnected in time, but the fuse or an internal fuse wire needs to be replaced manually by people, so that the disposable fuse is inconvenient to use, and certain economy is needed to buy new fuse equipment;

2. for the existing recoverable fuse, the fuse is generally a bimetallic fuse, the fuse controls the on-off of a circuit by the contact and separation of two metal sheets with different thermal deformation temperatures, although the circuit can be disconnected when the circuit is in failure and can be automatically recovered when the temperature is reduced, in the real life, the circuit failure is roughly divided into two types, one type is that the temperature of the circuit is increased due to the overload of electrical equipment, the influence caused by the failure is small, the normal use can be recovered only by closing one or two pieces of electrical equipment, the damage caused by the overload of the circuit can be prevented by the existing fuse, the other type is that the temperature is increased very fast when the circuit is in short circuit due to the failure caused by the short circuit, and if the temperature is reduced after the circuit is disconnected, the circuit can be short-circuited again under the condition that no one sees, so that the circuit can be short-disconnected ceaselessly, it is very likely to burn the circuit and even cause fire.

Therefore, it is necessary to design a recoverable fuse having short-circuit prevention and overload prevention functions to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a recoverable fuse with short circuit prevention and overload prevention functions.

In order to achieve the purpose, the invention adopts the following technical scheme:

a recoverable fuse with short circuit prevention and overload prevention functions comprises a shell, wherein two side walls of the shell are respectively provided with a positive pole column and a negative pole column, the side wall of the positive pole column, which is positioned in the shell, is fixedly connected with a resistance wire through a conducting wire, the inner wall of the shell is hermetically and slidably connected with a movable plate, the side wall, which is far away from one end of the positive pole column, of the movable plate is fixedly connected with a connecting rod, the inner wall of the shell is fixedly connected with two guide plates, one ends, far away from the inner wall of the shell, of the two guide plates are jointly and fixedly connected with a control box, the side wall, far away from one end of the movable plate, of the control box is provided with a plurality of air holes, one end, far away from the, the two side walls opposite to the installation blocks are fixedly connected with current conducting plates, the two current conducting plates are located in the control box and are in contact with the side walls of the current conducting blocks, the side walls of the current conducting plates at the lower ends are connected with one ends, away from the positive pole, of the resistance wires through wires, the current conducting plates at the upper ends are connected with the negative pole through wires, and limiting mechanisms used for limiting the movement of the installation blocks are arranged inside the fixed blocks at the upper ends.

Preferably, stop gear is including setting up the standing groove at installation piece lateral wall, be equipped with the slidable fixture block in the standing groove, and the fixture block has magnetism, the mounting groove inner wall is equipped with the draw-in groove that matches with the fixture block, the inside control chamber that is equipped with of fixed block, the inside magnetic stripe that can rotate that is equipped with of control chamber, magnetic stripe upper wall fixedly connected with pivot, the casing upper wall is equipped with the adjustment tank, the pivot extends to in the adjustment tank and fixedly connected with turn button.

The invention has the following beneficial effects:

1. compared with a disposable fuse, the movable plate can be pushed to move when the circuit fault temperature rises, so that the conductive blocks are driven to move, the conductive blocks are separated from the two conductive plates, the circuit is disconnected, and the movable plate is pushed to move to the right under the action of air pressure on the left side of the movable plate when the temperature is reduced, so that the conductive blocks are in contact with the conductive plates, the circuit is automatically recovered, the fuse or a fuse wire does not need to be manually slid more, the use is convenient, and the economic cost is saved;

2. compared with the existing recoverable fuse, the fuse can be switched on and off according to different circuit faults, when the circuit is overloaded, the circuit can be automatically recovered after the temperature is reduced, when the circuit is short-circuited, the position of the current conducting plate at the upper end can be limited by the limiting mechanism, the situation that the circuit is automatically recovered to cause secondary short circuit when the temperature is reduced is prevented, the circuit can be continuously short-circuited and disconnected only after the circuit fault is eliminated, the situation that electric equipment is not burnt out when the circuit is short-circuited is prevented through manual recovery, and dangers such as fire disasters and the like cannot occur.

Drawings

FIG. 1 is a schematic diagram of a recoverable fuse with short circuit and overload protection according to the present invention;

fig. 2 is an enlarged view of a structure at a position a of a recoverable fuse having short-circuit prevention and overload prevention functions according to the present invention.

In the figure: the device comprises a shell 1, a moving plate 2, a positive pole column 3, a negative pole column 4, a resistance wire 5, a connecting rod 6, a guide plate 7, a control box 8, a fixing block 9, a conductive block 10, a conductive plate 11, a mounting block 12, a mounting groove 13, a rotating shaft 14, an adjusting groove 15, a control cavity 16, a magnetic stripe 17, a clamping groove 18, a placing groove 19 and a clamping block 20.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Referring to fig. 1-2, a recoverable fuse with short circuit prevention and overload prevention functions comprises a shell 1, wherein a positive pole post 3 and a negative pole post 4 are respectively arranged on two side walls of the shell 1, and the positive pole post 3 and the negative pole post 4 are both connected with an external circuit through leads.

The side wall of the positive pole 3 in the shell 1 is fixedly connected with a resistance wire 5 through a conducting wire, the inner wall of the shell 1 is connected with a movable plate 2 in a sealing and sliding manner, the side wall of the movable plate 2 far away from one end of the positive pole 3 is fixedly connected with a connecting rod 6, the inner wall of the shell 1 is fixedly connected with two guide plates 7, the guide plates 7 are obliquely arranged to conveniently extrude gas into a control box 8 when the movable plate 2 moves, one ends of the two guide plates 7 far away from the inner wall of the shell 1 are fixedly connected with the control box 8 together, the side wall of the control box 8 far away from one end of the movable plate 2 is provided with a plurality of air holes, the caliber of the air holes is small, so that the air cannot be discharged out of the control box 8 through the air holes instantly when the movable plate 2 moves rapidly, one end of the connecting rod, two mounting grooves 13 inner walls all have installation piece 12 through spring elastic connection, the equal fixedly connected with current conducting plate 11 of the relative lateral wall of two installation pieces 12, two current conducting plates 11 all are located control box 8, and the relative lateral wall of two current conducting plates 11 all contacts with current conducting block 10 lateral wall, the current conducting plate 11 lateral wall that is located the lower extreme keeps away from 3 one ends of positive post through wire and resistance wire 5 and is connected, the wire runs through movable block 2, and the wire will be long enough, guarantee that movable block 2 can remove smoothly, current conducting plate 11 that is located the upper end passes through the wire and is connected with negative pole post 4.

The inside stop gear who is used for restricting installation piece 12 and removes that is equipped with of fixed block 9 that is located the upper end, stop gear is including setting up the standing groove 19 at installation piece 12 lateral wall, be equipped with slidable fixture block 20 in the standing groove 19, and fixture block 20 has magnetism, mounting groove 13 inner wall is equipped with the draw-in groove 18 that matches with fixture block 20, the inside control chamber 16 that is equipped with of fixed block 9, the inside magnetic stripe 17 that can rotate that is equipped with of control chamber 16, under the initial condition, the magnetic pole that magnetic stripe 17 and fixture block 20 are close to each other is heteropolar, magnetic stripe 17 upper wall fixedly connected with pivot 14, casing 1 upper wall is equipped with adjustment tank 15, pivot 14 extends to in adjustment tank 15 and fixedly.

When the circuit is overloaded due to the access of excessive electric appliances, the electric appliance is connected in parallel when the circuit is accessed into the circuit, and the total resistance of the parallel circuit is smaller than the resistance of any one circuit according to the characteristics of the parallel circuit, so the total current of the parallel circuit is increased, the heat released by the resistance wire 5 when the resistance wire is electrified is slowly increased, the air on the right side of the moving plate 2 is gradually expanded, the moving plate 2 is pushed to slowly move leftwards, when the moving plate 2 moves leftwards, the air is extruded into the control box 8 and is discharged out of the control box 8 from the air holes on the side wall of the control box 8, when the moving plate 2 moves leftwards, the conductive block 10 is driven to move leftwards through the connecting rod 6, when the conductive block 10 leaves the two conductive plates 11, the circuit is disconnected, and the circuit is prevented from being burnt due to overload, when the temperature on the right side of the moving plate 2 is reduced to the normal temperature, the air on the right side is contracted, the air pressure on the left side is greater than that on the right side, the moving plate 2 is pushed to move rightwards, the conductive block 10 is in contact with the conductive plate 11 again, and the circuit is restored.

When a circuit is short-circuited, different from circuit overload, current is increased instantly when the circuit is short-circuited, resistance wire 5 releases larger heat instantly, so that moving plate 2 is pushed to move leftwards quickly, air cannot be discharged through air holes in time because moving plate 2 moves faster, therefore, when conducting block 10 moves rightwards, air can extrude two conducting plates 11, conducting plates 11 are extruded into mounting groove 13, further mounting block 12 is driven to move into mounting groove 13, when placing groove 19 on side wall of mounting block 12 at upper end moves to position right facing clamping groove 18, clamping block 20 in placing groove 19 moves leftwards under attraction of magnetic stripe 17, enters clamping groove 18, circuit is disconnected timely, when temperature on right side of moving plate 2 recovers, mounting block 12 cannot move downwards, and therefore conducting plate 11 at upper end cannot contact conducting block 10, the circuit is still in disconnected state, the situation that the circuit automatically recovers to be short-circuited again is prevented from occurring.

Only after people restore circuit fault, through people's manual rotatory knob to drive magnetic stripe 17 through pivot 14 and rotate, make magnetic stripe 17's magnetic pole change, fixture block 20 receives magnetic stripe 17's repulsion force, moves to standing groove 19 in, and installation piece 12 moves down under the spring action of spring, drives the current conducting plate 11 of upper end and moves down, and contacts with conducting block 10, just can make the circuit resume normal.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a recoverable fuse with prevent short circuit and overload protection function, includes casing (1), casing (1) both sides wall is equipped with anodal post (3) and negative pole post (4) respectively, its characterized in that: the side wall of the positive pole (3) in the shell (1) is fixedly connected with a resistance wire (5) through a wire, the inner wall of the shell (1) is connected with a movable plate (2) in a sealing and sliding manner, the side wall of the movable plate (2) far away from one end of the positive pole (3) is fixedly connected with a connecting rod (6), the inner wall of the shell (1) is fixedly connected with two guide plates (7), two guide plates (7) are fixedly connected with a control box (8) together at the end far away from the inner wall of the shell (1), the side wall of the control box (8) far away from one end of the movable plate (2) is provided with a plurality of air holes, one end of the connecting rod (6) far away from the movable plate (2) is fixedly connected with a conductive block (10), the inner wall of the shell (1) is fixedly connected with two fixed blocks (9), the two opposite side walls of, two equal fixedly connected with current conducting plate (11) of lateral wall that installation piece (12) is relative, two current conducting plate (11) all is located control box (8), and two current conducting plate (11) relative lateral walls all with current conducting block (10) lateral wall contact, are located the lower extreme current conducting plate (11) lateral wall is kept away from anodal post (3) one end through wire and resistance wire (5) and is connected, is located the upper end current conducting plate (11) are connected with negative pole post (4) through the wire, are located the upper end fixed block (9) inside is equipped with the stop gear who is used for restricting installation piece (12) and removes.

2. A recoverable fuse having short circuit and overload protection according to claim 1, wherein: stop gear is including setting up standing groove (19) at installation piece (12) lateral wall, be equipped with slidable fixture block (20) in standing groove (19), and fixture block (20) have magnetism, mounting groove (13) inner wall is equipped with draw-in groove (18) that match with fixture block (20), fixed block (9) inside is equipped with control chamber (16), control chamber (16) inside is equipped with can pivoted magnetic stripe (17), magnetic stripe (17) upper wall fixedly connected with pivot (14), casing (1) upper wall is equipped with adjustment tank (15), pivot (14) extend to adjustment tank (15) in and fixedly connected with turn-button.