CN111446139A

CN111446139A - Nondestructive recoverable fuse

Info

Publication number: CN111446139A
Application number: CN202010383909.5A
Authority: CN
Inventors: 吴军; 张琼
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2020-07-24

Abstract

The invention discloses a nondestructive recoverable fuse which comprises a shell and an outer cover arranged on the shell, wherein a conductive column is fixed on the inner wall of the shell, a conductive block is fixed on the circumferential side wall of the conductive column, a lead screw is rotatably connected on the inner wall of one side of the shell, which is far away from the conductive column, a sliding block is in threaded connection with the circumferential side wall of the lead screw, a spring is fixed on the side wall of the sliding block, and an electric connecting piece embedded on the side wall of the shell is fixed at one end, which is far away from the sliding block. Has the advantages that: when the circuit broke down and lead to the short circuit, the electric current in the circuit will increase by a wide margin to make the spring shrink by a wide margin, and the electro-magnet is very big to the appeal in the twinkling of an eye of slider, make the slider can promote and cross the baffle, make the slider by the baffle separation after the motion, thereby make the circuit keep the state of opening circuit after breaking, thereby protect the safety of user and circuit, the user only need open the enclosing cover manual recovery slider and can resume the power supply after the fault handling finishes.

Description

Nondestructive recoverable fuse

Technical Field

The invention relates to the technical field of fuses, in particular to a lossless recoverable fuse.

Background

The fuse is an electric appliance which fuses a melt by heat generated by the fuse when the current exceeds a specified value and disconnects a circuit; in an electric power system, in order to prevent the damage of a line caused by excessive current in the electric power system, a fuse is generally required.

The current fuses mainly comprise disposable fuses and recoverable fuses; once the existing disposable fuse is blown, the whole fuse needs to be replaced, so that the existing disposable fuse is very inconvenient, is very inconvenient to replace manually and has certain potential safety hazard; the current recoverable fuse is mainly in the form of a bimetallic strip thermal relay, an on-off component of the recoverable fuse is composed of bimetallic strips with different thermal deformation coefficients, when the current is too high, the bimetallic strips are disconnected due to deformation and are connected after being cooled, but when an external circuit is short-circuited, short-circuit faults are not easy to check, long processing time is needed, and if the current is quickly recovered, short circuit is caused again, so that the circuit is continuously damaged.

Disclosure of Invention

The invention aims to solve the problem of high maintenance cost of a fuse in the prior art, and provides a lossless and recoverable fuse.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a harmless recoverable fuse, includes the shell and installs the enclosing cover on the shell, the inner wall of shell is fixed with and leads electrical pillar, the circumference lateral wall that leads electrical pillar is fixed with the conducting block, the shell is kept away from one side inner wall that leads electrical pillar and is rotated and be connected with the lead screw, the circumference lateral wall threaded connection of lead screw has the slider, the lateral wall of slider is fixed with the spring, the one end that the slider was kept away from to the spring is fixed with inlays the electric piece of establishing on the shell lateral wall, the lead screw rotates jointly with the one end that leads electrical pillar and is close to each other and is connected with the connecting block, the upper and lower both ends of connecting block all are fixed with the bearing box, the upper end of connecting block runs through and sets up the drippa.

In the nondestructive recoverable fuse, a bearing plate is fixed on the inner wall of one side, provided with the lead screw, of the shell, an electromagnet is fixed at the upper end of the bearing plate, and a baffle is rotatably connected to the upper end of the bearing plate through a torsional spring.

In the nondestructive recoverable fuse, the lead screw is rotationally connected with the connecting block through the one-way bearing, the lead screw is a ball lead screw, the electric connecting piece and the electric conducting post are communicated with an external circuit through a conducting wire, mercury is filled in one of the bearing boxes, the two conducting pieces positioned at the lower part are respectively abutted against the conducting block and the sliding block, and the connecting block and the two bearing boxes are made of non-metal materials.

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

1. in the invention, when an overload phenomenon occurs in the circuit, the current in the circuit is increased, so that the spring is contracted to a certain extent under the action of an induction magnetic field generated by the spring, the sliding block moves along with the spring to be separated from the conducting strip, the circuit is in a disconnected state at the moment of current increase, the response speed is high, and the continuous damage of high current to an electric appliance and the circuit is effectively avoided;

2. in the invention, after overload, the sliding of the sliding block drives the screw rod to rotate, so that the screw rod drives the connecting block to rotate, the bearing boxes at the upper end and the lower end of the connecting block rotate to replace positions, mercury originally positioned at the lower part moves to the upper end and gradually drops downwards through the dropping hole, sufficient mercury is not available in the bearing boxes positioned at the lower part after overturning to connect the conducting strips, and the circuit is always in a power-off state within a certain time, so that the circuit cannot be immediately powered on even if the recovery speed of the spring is high, sufficient time is provided for a user to handle overload electric appliances, and high current impact is avoided;

3. in the invention, mercury at the upper part gradually drops after overload, so that the circuit can be electrified again after a certain time, manual power supply recovery is not needed, the risk of manpower operation is reduced, meanwhile, a fuse is not needed to be replaced, no loss part is needed in the whole process, no part is needed to be replaced, the service life of the whole device is greatly prolonged, and the replacement and maintenance cost is reduced;

4. in the invention, when the short circuit is caused by the fault of the circuit, the current in the circuit is greatly increased, so that the spring is greatly contracted, the instant attraction of the electromagnet to the sliding block is very large, the sliding block is pushed to pass over the baffle, the sliding block is blocked by the baffle after moving, and the sliding block cannot be reset under the action of the elastic force of the spring even if the circuit is powered off, so that the circuit is kept in an open circuit state after being powered off, the safety of a user and the circuit is protected, and the power supply can be recovered by only opening the outer cover to manually recover the sliding block after the fault is processed.

Drawings

FIG. 1 is a schematic structural diagram of a non-destructive recoverable fuse in accordance with the present invention;

fig. 2 is a side sectional view of a non-destructively recoverable fuse in accordance with the present invention.

In the figure: the device comprises a shell 1, an outer cover 2, a lead screw 3, a conductive column 4, a conductive block 5, a sliding block 6, a spring 7, an electric connecting piece 8, a connecting block 9, a bearing box 10, a dripping hole 11, a conductive sheet 12, a bearing plate 13, an electromagnet 14 and a baffle 15.

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 nondestructive recoverable fuse, including shell 1 and the enclosing cover 2 of installing on shell 1, the inner wall of shell 1 is fixed with and leads electrical pillar 4, the circumference lateral wall of leading electrical pillar 4 is fixed with conducting block 5, shell 1 keeps away from one side inner wall of leading electrical pillar 4 and rotates and is connected with lead screw 3, the circumference lateral wall threaded connection of lead screw 3 has slider 6, the lateral wall of slider 6 is fixed with spring 7, the one end that slider 6 was kept away from to spring 7 is fixed with the electric connecting plate 8 of inlaying and establishing on shell 1 lateral wall, the one end that lead screw 3 and lead electrical pillar 4 are close to each other rotates jointly and is connected with connecting block 9, the upper and lower both ends of connecting block 9 all are fixed with bearing box 10, the upper end of connecting block 9 runs through and sets up the hole 11 that drips of connecting two bearing.

The inner wall of one side that shell 1 was equipped with lead screw 3 is fixed with loading board 13, and the upper end of loading board 13 is fixed with electro-magnet 14, and the upper end of loading board 13 is connected with baffle 15 through the torsional spring rotation, and loading board 13 is "L" shaped plate, blocks the one end that electro-magnet 14 was kept away from to baffle 15 for baffle 15 can only deflect to electro-magnet 14 one side, and can turn around automatically.

Lead screw 3 is connected through one-way bearing rotation with connecting block 9, can't drive connecting block 9 during antiport and rotate, lead screw 3 is ball screw, can't auto-lock, connect electric plate 8 and lead electrical pillar 4 and all communicate through wire and external circuit, one of them bears the inside packing of case 10 and has mercury, utilize two conducting strips 12 of the electric conductivity nature of mercury to accomplish switching on of circuit, two conducting strips 12 that are located the lower part offset with conducting block 5 and slider 6 respectively, and conducting block 5 and slider 6 all do not connect connecting block 9 with conducting strip 12 on upper portion and two bear case 10 and be non-metallic material and make, and can't electrically conduct, guarantee to bear case 10 and only play the bearing effect and connecting block 9 only plays the connection effect and can not electrically conduct, lead to the circular telegram.

In the invention, when the circuit normally operates, mercury is positioned in the lower bearing box 10 under the action of gravity, and the two conducting strips 12 at the lower part are both contacted with the mercury so as to realize electrical connection, and the whole circuit is in a power-on state;

when the current in the circuit is increased due to overload, the current passing through the spring 7 and the electromagnet 14 is increased, so that the spring 7 is contracted under the action of magnetic field force generated by the spring 7, and meanwhile, the slide block 6 is influenced by the magnetic force of the electromagnet 14 and tends to move towards the electromagnet, so that the slide block 6 slides on the screw rod 3 along with the contraction of the spring 7, the whole circuit is powered off at the moment that the slide block 6 is separated from the conducting plate 12, the effect of protecting the circuit and an electric appliance is realized, and the response speed is extremely high and can be finished at the moment that the current is increased;

while the slide block 6 slides, the screw rod 3 rotates under the action of the spiral thrust, so as to drive the connecting block 9 connected with the screw rod to rotate, thereby enabling the upper and lower carrying boxes 10 to be overturned and transposed, enabling the carrying box 10 filled with mercury to move to the upper end, after power failure, the spring 7 gradually recovers deformation, so as to push the slide block 6 to move reversely, so that the slide block 6 drives the screw rod 3 to rotate reversely, because the screw rod 3 is connected with the connecting block 9 through the one-way bearing, the overturned screw rod 3 can not drive the connecting block 9, so that the two carrying cases 10 are kept in a turned state, in which the two lower conducting strips 12 are electrically disconnected due to the absence of mercury, therefore, the whole circuit is still in a power-off state, and the damage to electric appliances and circuits caused by the fact that a user does not respond and process time due to instant recovery after power-off is avoided;

after the two bearing boxes 10 are turned over in case of power failure, mercury in the upper bearing box 10 slowly drops into the lower bearing box 10 through the dropping hole 11, so that mercury in the lower bearing box 10 is gradually increased and accumulated until the mercury in the lower bearing box 10 reaches the position of the lower conducting strip 12, the two conducting strips 12 are electrically connected, and the circuit can be powered back again;

when a short circuit is caused by a fault in a circuit, the current in the circuit is increased sharply and is far larger than the overload current, so the spring 7 contracts sharply, the attraction of the electromagnet 14 to the slider 6 increases sharply, the slider 6 is pushed to cross the baffle 15, the baffle 15 is connected by using a torsion spring, one end of the baffle 15 is blocked by the bearing plate 13, the baffle 15 can only deflect towards one side and automatically rotates after deflecting, the slider 6 crosses the baffle 15 and is blocked by the baffle 15, so the slider 6 cannot be contacted with the conducting plate 12, power supply cannot be recovered even after subsequent mercury drops, when the fault which cannot be easily solved such as the short circuit occurs in the circuit, the open circuit is kept, the fault which is not processed when power supply is recovered generates large impact and damage to the circuit again, after the fault is discharged, a user can open the outer cover 2 to manually push the baffle 15 to release the slider 6 to recover power supply, the safety of the circuit is ensured.

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. The lossless recoverable fuse comprises a shell (1) and an outer cover (2) installed on the shell (1), and is characterized in that a conductive column (4) is fixed on the inner wall of the shell (1), a conductive block (5) is fixed on the circumferential side wall of the conductive column (4), a lead screw (3) is rotatably connected to the inner wall of one side, away from the conductive column (4), of the shell (1), a sliding block (6) is in threaded connection with the circumferential side wall of the lead screw (3), a spring (7) is fixed on the side wall of the sliding block (6), a power connection piece (8) embedded on the side wall of the shell (1) is fixed at one end, away from the sliding block (6), of the lead screw (3) and the conductive column (4), close to each other, a connecting block (9) is connected in a rotating mode, and bearing boxes (10) are fixed at the upper end and the, the upper end of the connecting block (9) is provided with a dripping hole (11) for connecting the two bearing boxes (10) in a penetrating way, and the side walls of the two bearing boxes (10) are provided with two symmetrically arranged conducting strips (12) in a penetrating way.

2. The nondestructive recoverable fuse of claim 1, wherein a bearing plate (13) is fixed to the inner wall of the housing (1) on the side provided with the lead screw (3), an electromagnet (14) is fixed to the upper end of the bearing plate (13), and a baffle (15) is rotatably connected to the upper end of the bearing plate (13) through a torsion spring.

3. The lossless recoverable fuse is characterized in that the lead screw (3) is rotatably connected with the connecting block (9) through a one-way bearing, the lead screw (3) is a ball screw, the electric connecting piece (8) and the conductive column (4) are communicated with an external circuit through a lead, mercury is filled in one of the bearing boxes (10), two conductive sheets (12) positioned at the lower part are respectively abutted against the conductive block (5) and the sliding block (6), and the connecting block (9) and the two bearing boxes (10) are made of non-metal materials.