CN116435159A - Novel drop-out fuse based on memory alloy temperature deformation spring - Google Patents

Abstract

The utility model discloses a novel drop-out fuse based on a memory alloy temperature deformation spring, which belongs to the technical field of drop-out fuses, and comprises a temperature deformation spring protection structure and a fuse protection structure which are mutually connected in series, wherein the temperature deformation spring protection structure comprises a deformation spring which contracts along with the temperature rise, two ends of the deformation spring are respectively and fixedly connected with a rain cover and an elastic contact piece with electric conductivity, and the rain cover with fixed positions is connected with an external circuit; the fuse protection structure comprises a fuse, a rigid fuse tube is arranged outside the fuse, the fuse tube is rotationally arranged on an external circuit, the fuse tube is provided with an opening end and a closing end, the closing end is made of conductive materials, the fuse is in contact connection with one side of the closing end, the other side of the closing end is in butt joint or disconnection with an elastic contact piece, the fuse penetrates through the opening end to be fixedly connected with the external circuit, the fusing temperature of the fuse is higher than the deformation temperature of a temperature deformation spring, and the working reliability of the protection circuit is improved under the double protection of the two protection structures.

Description

A new drop-out fuse based on memory alloy temperature deformation spring

technical field

The invention relates to the technical field of dropout fuses, in particular to a novel dropout fuse based on memory alloy temperature deformation springs.

Background technique

Drop-out fuses are widely used in power systems for their safety, reliability and superior cost performance, and play a protective role in power systems. Existing drop-out fuses such as the utility model with the application number 201820321726.9 and the utility model with the application number 201920770384.3 all use the fuse to cut off the circuit, and after the fuse is blown, the staff needs to climb to the tower to replace the fuse In order to recover, the workload of the staff is relatively large and the nature of the work is dangerous. The replacement of the fuse needs to be replaced by a power outage. Modern life is inseparable from electricity all the time. A power outage will cause some economic and social losses to the user, and bring a lot of inconvenience to the work and life of the user; A large number of fuses increase economic loss. Therefore, in order to solve the above problems, the present invention provides a new dropout fuse based on memory alloy temperature deformation spring.

Contents of the invention

The object of the present invention is to aim at the defects and deficiencies in the prior art, to provide a new drop-out fuse based on memory alloy temperature deformation spring, under the double protection of memory alloy temperature deformation spring protection structure and fuse protection structure, improve The working reliability of the protection circuit.

In order to achieve the above object, the technical scheme adopted in the present invention is:

The present invention provides a novel drop-out fuse based on memory alloy temperature deformation spring, which includes memory alloy temperature deformation spring protection structure and fuse protection structure connected in series, and the memory alloy temperature deformation spring protection structure includes Shrunken memory alloy temperature deformation spring, the two ends of the memory alloy temperature deformation spring are respectively fixedly connected to the rainproof cover and the elastic contact piece with conductive properties, and the fixed position of the rainproof cover is connected to the incoming line terminal/ The outlet ends are connected; the fuse protection structure includes a fuse with conductive properties, and a rigid fuse tube is provided outside the fuse, and the fuse tube is rotatably arranged on an external circuit, and the fuse tube has an open end and a closed end, the closed end is made of conductive material, the fuse is in contact with one side of the closed end, and the other side of the closed end is in contact with or disconnected from the elastic contact piece, the The fuse passes through the open end and is fixedly connected to the outlet end/inlet end of the external circuit, and the fusing temperature of the fuse is higher than the deformation temperature of the memory alloy temperature deformation spring;

Preferably, the fuse is provided with a conductive disk, the conductive disk is fixedly connected to the fuse tube, and the conductive disk is connected to the closed end;

Preferably, a cap is detachably installed on the closed end of the melting tube, the cap is made of conductive material, one end of the cap is in contact with the conductive disk, and the other end of the cap Connect or disconnect with the elastic contact piece;

Preferably, a protrusion is provided on the cap, and a groove matching the protrusion is provided on the elastic contact piece;

Preferably, the elastic contact piece is provided with a through hole, and the rainproof cover is provided with an intermediate movable steel body adapted to the through hole, the intermediate movable steel body is inserted into the through hole, and the intermediate movable steel body The end of the body does not exceed the contact surface of the elastic contact piece and the pipe cap, and the contact point between the elastic contact piece and the pipe cap is located on the extension line of the middle movable steel body; the front and back of the fusion pipe Both ends are provided with limit rods, and an opening for limiting the moving path of the melting tube is provided between the two limit rods, and the contact point between the elastic contact piece and the tube cap is located on the path defined by the opening, and the The size of the opening is adapted to the diameter of the melting tube;

Preferably, the melting tube is provided with an operating ring to facilitate the installation of the melting tube to the state of circuit connection, and the operating ring is adapted to the operating rod used by the staff;

Preferably, a lower static contact is fixed on the outgoing line end/incoming line end, and a lower moving contact is installed on the lower static contact, and one end of the lower moving contact is rotatably connected to the melting tube , the other end of the lower moving contact is fixedly connected to the fuse;

Preferably, the lower moving contact is provided with a pop-up piece for tensioning the fuse, and the length of the pop-up piece is adapted to the tightness of the fuse;

Preferably, the ejection piece is rotatably mounted on the lower moving contact;

Preferably, one side of the new drop-out fuse is provided with an insulator, one end of the insulator is fixedly connected to the rainproof cover, and the other end of the insulator is fixedly connected to the lower static contact.

Compared with the prior art, the present invention has achieved the following technical effects:

1. The present invention can produce the following technical effects by setting the memory alloy temperature deformation spring protection structure and the fuse protection structure connected in series, and the deformation temperature of the memory alloy temperature deformation spring is lower than the fusing temperature of the fuse wire: first, when the memory alloy When the alloy temperature deformation spring is working normally, the heat generated by the high current first causes the memory alloy temperature deformation spring to shrink and deform, and drives the elastic contact piece to move upwards to break away from the contact with the fusion tube, thereby cutting off the fault line and protecting the circuit. Because the fuse is not blown at the time, it is not necessary to replace the fuse when the circuit is restored, which solves the inconvenience caused by replacing the fuse in the prior art and reduces the maintenance cost; secondly, when the memory alloy temperature deformation spring breaks down When the staff did not discover or replace the memory alloy temperature deformation spring in time in the future, the heat generated by the high current will blow the fuse, causing the fuse tube to fall under the action of gravity, cut off the faulty line, and protect the line; Under the interaction of the temperature deformation spring protection structure and the fuse protection structure, the new drop-out fuse of the present invention can implement double protection for the circuit, which improves the reliability of circuit protection;

2. In the present invention, by setting the middle movable steel body in a vertical state, a through hole for passing through the middle movable steel body is set on the elastic contact piece, and the clamping position of the elastic contact piece and the fusion pipe is at the center of the middle movable steel body. The method on the extension line limits the reset path of the elastic contact piece and improves the position accuracy of the elastic contact piece after reset; by setting limit rods on the front and rear sides of the fusion tube, a formation is formed between the two limit rods to limit the movement of the fusion tube The opening of the path, and the clamping position of the elastic contact piece and the melting tube are on the path defined by the opening, which limits the reset path of the melting tube and improves the position accuracy of the melting tube after reset. Under the joint action of the two, The working efficiency of re-connecting the circuit is improved when the temperature-deformed spring of the memory alloy works normally.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Figure 1 is a schematic diagram of the overall structure of the new drop-out fuse;

Fig. 2 is the cross-sectional structure schematic diagram of place A;

Figure 3 is a schematic diagram of the axial side structure at A;

Figure 4 is a schematic diagram of the axial side structure at B;

Figure 5 is a schematic diagram of the axial structure at B in the other direction

Among them, 1. Memory alloy temperature deformation spring; 2. Rainproof cover; 3. Elastic contact piece; 4. Incoming wire end; 5. Outgoing wire end; Closed end; 10, conductive disc; 11, cap; 13, protrusion; 14, groove; 15, limit bracket; 16, limit rod; 17, operating ring; 18, lower static contact; 19, Lower moving contact; 20, first rotating shaft; 21, second rotating shaft; 22, lug; 23, pop-up piece; 24, insulator; 25, middle movable steel body; 26, screw; 27, opening.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figures 1 to 5, the present invention provides a novel drop-out fuse based on memory alloy temperature-deformation springs, including memory alloy temperature-deformation spring protection structures and fuse protection structures connected in series, and memory alloy temperature-deformation spring protection structures It includes a memory alloy temperature deformation spring 1 that shrinks as the temperature rises, and the two ends of the memory alloy temperature deformation spring 1 are respectively fixedly connected to the rainproof cover 2 and the elastic contact piece 3 with conductive properties, and the rainproof cover 2 with a fixed position is connected to the The inlet terminal 4/outlet terminal 5 of the external circuit are connected; the fuse protection structure includes a fuse 6 with electrical conductivity, and a rigid fuse tube 7 is provided outside the fuse 6, and the fuse tube 7 is rotatably arranged on the external circuit. The fuse tube 7 has an open end 8 and a closed end 9, the closed end 9 is made of conductive material, the fuse 6 is connected to one side of the closed end 9, and the other side of the closed end 9 is in contact with the elastic contact piece 3 or disconnected. Open the connection, the fuse 6 passes through the open end 8 and is fixedly connected to the outlet terminal 5/incoming terminal 4 of the external circuit, when the rainproof cover 2 is connected to the input terminal 4, the fuse 6 is connected to the outlet terminal 5, and the rainproof cover 2 is connected to When the outlet terminal 5, the fuse 6 is connected to the inlet terminal 4, and the fusing temperature of the fuse 6 is higher than the deformation temperature of the memory alloy temperature deformation spring 1; when there is a large current passing through the line, the large current makes the memory alloy temperature deformation spring 1 When the temperature rises, when the temperature reaches the deformation critical point of the memory alloy temperature deformation spring 1, the memory alloy temperature deformation spring 1 shrinks and deforms, and the deformed memory alloy temperature deformation spring 1 drives the elastic contact piece 3 to move upward, so that the melting tube The closed end 9 of 7 is separated from the elastic contact piece 3, and the fusion pipe 7 that has lost the support of the elastic contact piece 3 rotates downward around its fulcrum, thereby cutting off the fault line. The deformation temperature of the memory alloy temperature deformation spring 1 is set to be lower than the fusing temperature of the fuse 6, under the condition that the memory alloy temperature deformation spring 1 works normally, the fault circuit can be cut off by the contraction of the memory alloy temperature deformation spring 1, because at this time The fuse 6 is not blown, so after troubleshooting, the contact connection between the fuse tube 7 and the elastic contact piece 3 can be directly connected to the entire circuit, which is convenient for maintenance, and the memory alloy temperature deformation spring 1 can be reused, and the upper limit of reuse is high. It is suitable for lines of various voltage levels and does not need to be replaced frequently, which can reduce the number of maintenance, improve the safety factor of the staff, and improve economic benefits; secondly, when a large current has occurred, but the memory alloy temperature deformation spring 1 has not contracted and deformed, The high current will blow the fuse 6, and after losing the tension of the fuse 6, the fuse 7 will fall rapidly under the action of its own gravity, thereby cutting off the faulty line. This setting can implement double protection for the line and greatly improve the reliability of circuit protection , as a preferred embodiment of the present invention, the characteristic of memory alloy temperature deformation spring 1 is that the temperature rises to make it shrink, and the temperature falls to make it return to the elongated state.

One end of the fuse 6 is provided with a conductive disc 10. As a preferred embodiment of the present invention, the fuse 6 and the conductive disc 10 are of an integrated structure, and the end of the fuse tube 7 away from the open end 8 is detachably mounted with a cap 11. Use a cap 11 to close the mouth of the fusion tube 7 to form a closed end 9. The diameter of the conductive disk 10 is adapted to the inner diameter of the mouth of the fusion pipe 7, so that the conductive disk 10 can be clamped on the pipe of the fusion pipe 7. The opening of the fuse 6 plays the role of fixing the fuse 6. When replacing the fuse 6, after the end of the fuse 6 passes through the fuse tube 7 from top to bottom, the conductive disk 10 is clamped on the nozzle of the fuse tube 7, and then the tube is tightened. Cap 11, after the cap 11 is tightened, the inner surface of the cap 11 is in contact with the axial surface of the conductive disk 10, the cap 11 is made of conductive material, when the circuit is connected, the cap 11 is far away from the conductive disk 10 The outer surface of the outer surface is in contact with the elastic contact piece 3; the memory alloy temperature deformation spring 1 shrinks, so that when the circuit is in the disconnected state, the outer surface of the tube cap 11 away from the conductive disc 10 is separated from the elastic contact piece 3; in order to improve the tube cap 11 The contact performance with the elastic contact piece 3, the present invention is provided with a protrusion 13 on the cap 11, and the elastic contact piece 3 is provided with a groove 14 matching the protrusion 13, and the protrusion 13 is assembled in the groove At 14, the contact stability between the cap 11 and the elastic contact piece 3 is improved.

One end of the elastic contact piece 3 away from its fixed point with the memory alloy temperature deformation spring 1 is fixedly connected with the rainproof cover 2, and the rainproof cover 2 is also fixedly provided with a limit bracket 15, and the limit bracket 15 has two limit rods 16, The two limit rods 16 are respectively located on the front and rear sides of the melting tube 7. The position of the limit rods 16 matches the position where the protrusion 13 snaps into the groove 14. There is an opening between the two limit rods 16. 27. The clamping position of the melting tube 7 and the elastic contact piece 3 is just on the path defined by the opening 27. When the melting tube 7 is reinstalled, under the limitation of the opening 27, the melting tube 7 is in its vertical state. The clamping position with the elastic contact piece 3, the distance between the limit rod 16 and the melting tube 7 in the front and rear direction should be as small as possible, so as to reduce the time when the melting tube 7 is loaded into the position clamped with the elastic contact piece 3. The position deviation produced in the lateral direction; in addition, the middle part of the memory alloy temperature deformation spring 1 runs through the middle movable steel body 25, and one end of the middle movable steel body 25 is fixedly arranged on the rainproof cover 2, and the other end is inserted into the installation on the elastic contact piece 3 In the hole, and when the memory alloy temperature deformation spring 1 is in an elongated state, the end of the middle movable steel body 25 will not exceed the inner surface of the elastic contact piece 3, so that it will not produce thrust to the melting tube 7. When the memory alloy temperature deformation When the spring 1 is in the contracted state, the elastic contact piece 3 moves along the direction defined by the middle movable steel body 25, the middle movable steel body 25 is vertically arranged, and the clamping position of the elastic contact piece 3 and the melting tube 7 is just located in the middle movable steel body. on the extension line of body 25; when the circuit is cut off due to the contraction of the memory alloy temperature deformation spring 1, after the fault is eliminated and the length of the memory alloy temperature deformation spring 1 returns to the elongated state, there is no need to power off, and the staff use a special The tool connects the fusion tube 7 back to the circuit, and the protrusion 13 is snapped into the groove 14 to connect the circuit again. During this process, the push-back direction of the fusion tube 7 is limited through the opening 27, and the middle movable steel body 25 Limit the moving direction of the elastic contact piece 3, thereby improving the installation efficiency of the reassembly of the melting tube 7 and the elastic contact piece 3; in order to facilitate the staff to push back the melting tube 7, the present invention is provided with an operating ring 17 on the melting tube 7 , The size and shape of the operating ring 17 are compatible with the insulating operating rod used by the staff. When the circuit is connected again, use the insulating operating rod to hook the operating ring 17 to connect the fusion tube 7 back to the circuit.

As a preferred embodiment of the present invention, the rainproof cover 2 is connected to the incoming wire end 4, and the lower static contact 18 is fixed on the outgoing wire end 5, and the lower static contact 18 is provided with a seat for accommodating the lower moving contact 19. Cavity, the lower moving contact 19 is placed in this cavity, the lower moving contact 19 is provided with a first rotating shaft 20 and a second rotating shaft 21, and the melting tube 7 is provided with a lug 22, and the lug 22 is connected with the second rotating shaft A rotating shaft 20 is rotationally connected, the lower static contact 18 is provided with a chute for accommodating the second rotating shaft 21, and the second rotating shaft 21 is detachably installed in the chute; the lower moving contact 19 is provided with a chute for winding The protrusion of the fuse 6, after the upper end of the fuse 6 is fixed on the nozzle of the fusion pipe 7, its lower end is wound and fixed on this protrusion, as a preferred embodiment of the present invention, the protrusion is assembled on the lower The screw 26 on the contact 19 and the pop-up piece 23 for tensioning the fuse 6 are arranged on the lower moving contact 19. Tightly fix the fuse 6 inside the fuse tube 7 and make good contact with the elastic contact piece 3 and the lower moving contact 19 . Preferably, the pop-up piece 23 is rotatably installed on the lower moving contact 19 .

One side of the new drop-out fuse is provided with an insulator 24, one end of the insulator 24 is fixedly connected to the rainproof cover 2, the other end of the insulator 24 is fixedly connected to the lower static contact 18, and the function of the insulator 24 is support and protection, which can be Provide convenience and protection for personnel during maintenance.

It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. . Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the invention, and any reference sign in a claim shall not be construed as limiting the claim concerned.

Claims (10)

1. A novel drop-out fuse based on memory alloy temperature-deformation springs, characterized in that: comprising memory alloy temperature-deformation spring protection structures and fuse protection structures connected in series, said memory alloy temperature-deformation spring protection structures include The memory alloy temperature deformation spring that rises and shrinks, the two ends of the memory alloy temperature deformation spring are respectively fixedly connected with the rainproof cover and the elastic contact piece with conductive properties, and the fixed position of the rainproof cover is connected with the external circuit. The wire end/outlet end are connected; the fuse protection structure includes a conductive fuse, and the outside of the fuse is provided with a rigid fuse tube, and the fuse tube is rotatably arranged on an external circuit, and the fuse tube It has an open end and a closed end, the closed end is made of conductive material, the fuse is in contact with one side of the closed end, and the other side of the closed end is in contact with or disconnected from the elastic contact piece , the fuse passes through the open end and is fixedly connected to the outlet end/inlet end of the external circuit, and the fusing temperature of the fuse is higher than the deformation temperature of the memory alloy temperature deformation spring. 2. The new drop-out fuse according to claim 1, characterized in that: the fuse is provided with a conductive disk, the conductive disk is fixedly connected to the fuse tube, and the conductive disk is connected to the fuse The closed-end contact connection described above. 3. The new drop-out fuse according to claim 2, characterized in that: a cap is detachably installed on the closed end of the melting tube, the cap is made of conductive material, and one end of the cap is The other end of the tube cap is connected to or disconnected from the elastic contact piece. 4. The new drop-out fuse according to claim 3, wherein a protrusion is provided on the cap, and a groove matching the protrusion is provided on the elastic contact piece. 5. The new drop-out fuse according to claim 3, characterized in that: the elastic contact piece is provided with a through hole, and the rainproof cover is provided with an intermediate movable steel body matching the through hole, so The middle movable steel body is inserted into the through hole, the end of the middle movable steel body does not exceed the contact surface of the elastic contact piece and the pipe cap, and the contact point between the elastic contact piece and the pipe cap is located at the The extension line of the movable steel body in the middle; the front and rear ends of the melting pipe are provided with limit rods, and an opening for limiting the moving path of the melting pipe is arranged between the two limit rods. The contact point of the cap is located on the path defined by the opening, and the size of the opening is adapted to the diameter of the melting tube. 6. The new drop-out fuse according to claim 5, characterized in that: the melting tube is provided with an operating ring for easy installation of the melting tube to the circuit-connected state, and the operating ring is used by the staff Compatible with the joystick. 7. The new drop-out fuse according to claim 1, characterized in that: a lower static contact is fixed on the outlet end/incoming wire end, and a lower dynamic contact is installed on the lower static contact. One end of the lower moving contact is rotatably connected to the fusion tube, and the other end of the lower moving contact is fixedly connected to the fuse. 8. The new drop-out fuse according to claim 7, characterized in that: the lower moving contact is provided with a pop-up piece for tensioning the fuse, and the length of the pop-up piece is the same as that of the fuse suitable for tightness. 9. The new drop-out fuse according to claim 8, wherein the pop-up piece is rotatably mounted on the lower moving contact. 10. The new drop-out fuse according to claim 7, characterized in that: one side of the new drop-out fuse is provided with an insulator, one end of the insulator is fixedly connected to the rainproof cover, and the insulator The other end is fixedly connected with the lower static contact.

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