Backup high-voltage current-limiting fuse

Abstract

The utility model relates to the technical field of fuses, and discloses a backup high-voltage current-limiting fuse, which comprises a protective tube and a base, a fixed flange is fixedly mounted at the bottom of the protective tube, a sealing ring is movably mounted on the protective tube above the fixed flange, and a porcelain sleeve is fixedly mounted at the top of the sealing ring. Two fixing seats are fixedly installed on the outer side of the base, pull rods are movably installed on one sides of the two fixing seats respectively, a handle is fixedly connected between the two pull rods, and a first side plate is movably installed on one side of one pull rod. The base and the porcelain sleeve are installed in the protection tube through the two pull rods, and the second side plate and the insertion block are arranged on one side of one pull rod, so that the clamping seat on one side of the bottom of the second side plate can be clamped into the clamping seat along with rotation of the pull rods, and the effect of preventing mistaken touch and pulling on the pull rods can be achieved; and the first side plate, the second side plate and the clamping seat can move conveniently to relieve rotation limiting of the pull rod.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a backup type high-voltage current-limiting fuse. Background Art

[0002] A fuse is an electrical protection device. When the fuse is arranged in a transformer, when the current of the transformer abnormally increases due to abnormal conditions such as overload and short circuit, the fuse can quickly respond and cut off the circuit by melting the fuse inside, thereby effectively preventing the transformer from being damaged due to excessive current;

[0003] The oil-immersed fully enclosed high-voltage current-limiting fuse adopts an oil-immersed cooling method, and the internal fuse can quickly melt when the circuit is overloaded or short-circuited, cutting off the fault current and protecting power equipment such as transformers from damage. For example, the Chinese utility model patent with the publication number CN205582870U discloses: an oil-immersed fully enclosed high-voltage current-limiting fuse. This application includes a cylindrical base with a one-way opening and a fuse carrier and a fuse element arranged in sequence from the opening of the base inward. The base is composed of a front cylinder and a base with an opening. An installation seat is arranged at the opening of the base, the base and the installation seat are integrally manufactured, and a conical sealing plug and a circular cover plate are also arranged at the opening of the base. A pressing wrench is arranged on the cover plate, the pressing wrench is installed on the outer side of the cover plate through a positioning screw, an arc-shaped buckle groove is arranged on the pressing wrench, and the arc-shaped buckle groove is locked with a radial cylindrical pin arranged on the outer wall at the opening of the base. Therefore, after the cover plate, the sealing plug and the insulating connecting rod are inserted and installed in the base, the arc-shaped buckle groove in the pressing wrench is buckled on the cylindrical pin. However, since there is no limiting mechanism after the inner wall of the arc-shaped buckle groove is in contact with the cylindrical pressure, it is easy to cause the pressing wrench to be stressed during inspection, and thus it is easy to slip or shift, which may cause the pressing wrench to be accidentally pulled and rotated, resulting in an accident. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a backup type high-voltage current-limiting fuse, which can effectively solve the problems in the background art.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A standby high-voltage current-limiting fuse, comprising a protection tube and a base. A fixed flange is fixedly installed at the bottom of the protection tube. A sealing ring is movably installed on the protection tube at a position above the fixed flange. A porcelain bushing is fixedly installed at the top of the sealing ring. Two fixed seats are fixedly installed on the outer side of the base. A pull rod is movably installed on one side of each of the two fixed seats. A handle is fixedly connected between the two pull rods. A first side plate is movably installed on one side of one of the pull rods. A second side plate is movably installed behind the first side plate. An insertion block is movably installed in the handle. The porcelain bushing is inserted and installed in the protection tube through the base. A first terminal is fixedly installed on the outer side of the porcelain bushing. The first terminal passes through the protection tube and extends to the outside of the protection tube. A second terminal is fixedly installed at the top of the porcelain bushing, and the second terminal also passes through the protection tube and extends to the outside of the protection tube.

[0007] As a further preferred solution of the present invention, two fixing pins are fixedly installed on the outer side of the protection tube, and a card seat is fixedly installed at the top of the fixing pins.

[0008] As a further preferred solution of the present invention, a buckle rod is fixedly installed on one side of the top of the pull rod. The buckle rod is in an arc structure. The side of the pull rod away from the handle is rotatably installed on one side of the corresponding fixed seat through a screw.

[0009] Based on this, by rotatably installing the pull rod on one side of the fixed seat and cooperating with the buckle rod and the fixing pin, the base can be stably inserted and installed at the bottom inside the protection tube.

[0010] As a further preferred solution of the present invention, an installation groove is opened in the handle. A jack is opened on one side of the installation groove, and a screw groove is opened on the other side of the installation groove.

[0011] As a further preferred solution of the present invention, a metal elastic sheet is fixedly installed on one side of the top of the first side plate. A clamping block is fixedly installed on one side of the bottom of the second side plate. The first side plate and the second side plate are rotatably connected through a pin shaft, and the side of the first side plate away from the second side plate is inserted into the installation groove.

[0012] As a further preferred solution of the present invention, a button is fixedly installed on one side of the insertion block. A counterbore is opened in the insertion block and the button. A connecting screw is inserted into the second side plate and the connecting screw. One side of the insertion block is inserted into the jack. One side of the connecting screw is threadedly connected to the screw groove. A compression spring is sleeved on the connecting screw between one side of the installation groove and the first side plate.

[0013] Based on this, by setting the first side plate and the second side plate on one side of the pull rod, when the pull rod is buckled on the fixed pin through the buckle rod, the clamping block at the bottom of the second side plate can be clamped into the clamping seat, which can limit the rotation of the pull rod and prevent the handle and the pull rod from being accidentally pulled, so that the base and the porcelain bushing are separated from the protection tube.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] For a standby type high-voltage current-limiting fuse of the utility model, the base and the porcelain bushing are installed in the protection tube through two pull rods, and a second side plate and an insertion block are arranged on one side of one of the pull rods, so that the clamping seat on one side of the bottom of the second side plate can be clamped into the clamping seat following the rotation of the pull rod, which can play a role in preventing the pull rod from being accidentally touched and pulled. At the same time, with the arrangement of the insertion block, the button and the compression spring, it is also convenient for the first side plate, the second side plate and the clamping seat to displace to release the rotation limit of the pull rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 is a schematic diagram of the split structure of the pull rod and the handle of the utility model;

[0018] Figure 3 is a schematic diagram of the split structure of the first side plate, the second side plate and the insertion block of the utility model;

[0019] Figure 4 is a schematic diagram of a partial structure of the protection tube of the utility model.

[0020] In the figure: 1. protection tube; 2. first terminal; 3. second terminal; 4. fixed flange; 5. sealing ring; 6. base; 7. porcelain bushing; 8. fixed seat; 9. pull rod; 10. handle; 11. first side plate; 12. second side plate; 13. insertion block; 14. fixed pin; 15. clamping seat; 16. buckle rod; 17. installation groove; 18. jack; 19. screw groove; 20. clamping block; 21. metal elastic sheet; 22. button; 23. connecting screw; 24. compression spring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] In order to make the technical means, creative features, achieved purposes and functions of the utility model easy to understand, the utility model will be further described below in conjunction with specific embodiments.

[0022] As Figures 1 - 4As shown in the figure, a backup type high-voltage current-limiting fuse provided by the utility model includes a protection tube 1 and a base 6. A fixed flange 4 is fixedly installed at the bottom of the protection tube 1. A sealing ring 5 is movably installed on the protection tube 1 above the fixed flange 4. A porcelain bushing 7 is fixedly installed at the top of the sealing ring 5. Two fixed seats 8 are fixedly installed on the outside of the base 6. A pull rod 9 is movably installed on one side of each of the two fixed seats 8. A handle 10 is fixedly connected between the two pull rods 9. A first side plate 11 is movably installed on one side of one of the pull rods 9. A second side plate 12 is movably installed behind the first side plate 11. An insertion block 13 is movably installed in the handle 10. The porcelain bushing 7 is inserted and installed in the protection tube 1 through the base 6. A first terminal 2 is fixedly installed on the outside of the porcelain bushing 7. The first terminal 2 passes through the protection tube 1 and extends to the outside of the protection tube 1. A second terminal 3 is fixedly installed at the top of the porcelain bushing 7, and the second terminal 3 also passes through the protection tube 1 and extends to the outside of the protection tube 1.

[0023] Two fixing pins 14 are fixedly installed on the outside of the protection tube 1. A clamping seat 15 is fixedly installed at the top of the fixing pins 14. A buckle rod 16 is fixedly installed on one side of the top of the pull rod 9. The buckle rod 16 is in an arc structure. One side of the pull rod 9 away from the handle 10 is rotatably installed on one side of the corresponding fixed seat 8 through a screw. Based on this, the pull rod 9 is rotatably installed on one side of the fixed seat 8, and in cooperation with the buckle rod 16 and the fixing pin 14, the base 6 can be stably inserted and installed at the bottom inside the protection tube 1.

[0024] As Figures 2 - 4 shown, an installation groove 17 is opened in the handle 10. A jack 18 is opened on one side inside the installation groove 17. A threaded groove 19 is opened on the other side inside the installation groove 17. A metal elastic sheet 21 is fixedly installed on one side of the top of the first side plate 11. A clamping block 20 is fixedly installed on one side of the bottom of the second side plate 12. The first side plate 11 and the second side plate 12 are rotatably connected through a pin shaft, and one side of the first side plate 11 away from the second side plate 12 is inserted into the installation groove 17. A button 22 is fixedly installed on one side of the insertion block 13. A counterbore is opened in the insertion block 13 and the button 22, and a connecting screw 23 is inserted through the second side plate 12 and the connecting screw 23. One side of the insertion block 13 is inserted into the jack 18. One side of the connecting screw 23 is threadedly connected to the threaded groove 19. A compression spring 24 is sleeved on the connecting screw 23 between one side inside the installation groove 17 and the first side plate 11. Based on this, by arranging the first side plate 11 and the second side plate 12 on one side of the pull rod 9, when the pull rod 9 is buckled on the fixing pin 14 through the buckle rod 16, the clamping block 20 at the bottom of the second side plate 12 can be clamped into the clamping seat 15, so as to limit the rotation of the pull rod 9 and prevent the handle 10 and the pull rod 9 from being accidentally pulled, causing the base 6 and the porcelain bushing 7 to be separated from the protection tube 1.

[0025] It should be noted that the present utility model is a standby type high-voltage current-limiting fuse. When installing the porcelain bushing 7, the porcelain bushing 7 can be inserted and installed in the protection tube 1 through the base 6, and the first terminal 2 and the second terminal 3 are respectively fixedly installed on the connection ends on the outer side and the top of the porcelain bushing 7 from the outside. Then, the handle 10 can be manually rotated, so that the handle 10 drives the two pull rods 9 to rotate on one side of the corresponding fixed seat 8. Thus, the two pull rods 9 are respectively buckled on the corresponding fixed pins 14 on the outer side of the protection tube 1 through the buckle rods 16 on one side of the top, and the base 6 and the porcelain bushing 7 can be fixed in the protection tube 1. While one of the pull rods 9 rotates, the first side plate 11 and the second side plate 12 are driven to rotate synchronously in cooperation with the handle 10, and the block 20 at the bottom of the second side plate 12 rotates on one side of the first side plate 11 and bends the metal elastic sheet 21 after being squeezed by the card seat 15. Thus, the block 20 at the bottom of the second side plate 12 is clamped into the horizontal L-shaped groove in the card seat 15, and the rotation of the pull rod 9 can be restricted. When it is necessary to disassemble the base 6 and the porcelain bushing 7 from the protection tube 1, the handle 10 can be held with one hand, and the button 22 is pressed to one side. Then, the button 22 drives the insertion block 13 to move to one side in the insertion hole 18, and the insertion block 13 pushes the first side plate 11 to one side. Thus, the first side plate 11 compresses the compression spring 24 to one side in the installation groove 17. At the same time, the first side plate 11 drives the second side plate 12 to move to one side, and the actual block 20 can be horizontally displaced and separated from the horizontal L-shaped groove in the card seat 15. Then, the handle 10 can be held to drive the two pull rods 9 to rotate on one side of the corresponding fixed seat 8, and the buckle rod 16 can be disengaged from the fixed pin 14.

[0026] The above shows and describes the basic principles, main features and advantages of the present utility model. Those skilled in the art of this industry should understand that the present utility model is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A standby high-voltage current-limiting fuse, characterized in that: It includes a protection tube (1) and a base (6). A fixed flange (4) is fixedly installed at the bottom of the protection tube (1). A sealing ring (5) is movably installed on the protection tube (1) at a position above the fixed flange (4). A porcelain bushing (7) is fixedly installed at the top of the sealing ring (5). Two fixed seats (8) are fixedly installed on the outer side of the base (6). A pull rod (9) is movably installed on one side of each of the two fixed seats (8). A handle (10) is fixedly connected between the two pull rods (9). A first side plate (11) is movably installed on one side of one of the pull rods (9). A second side plate (12) is movably installed at the rear of the first side plate (11). An insertion block (13) is movably installed in the handle (10). The porcelain bushing (7) is inserted and installed in the protection tube (1) through the base (6). A first terminal (2) is fixedly installed on the outer side of the porcelain bushing (7). The first terminal (2) passes through the protection tube (1) and extends to the outside of the protection tube (1). A second terminal (3) is fixedly installed at the top of the porcelain bushing (7), and the second terminal (3) also passes through the protection tube (1) and extends to the outside of the protection tube (1).

2. The backup type high voltage current limiting fuse according to claim 1, characterized in that: Two fixed pins (14) are fixedly installed on the outer side of the protection tube (1). A card seat (15) is fixedly installed at the top of the fixed pin (14).

3. The backup type high voltage current limiting fuse according to claim 2, characterized in that: A buckle rod (16) is fixedly installed on one side at the top of the pull rod (9). The buckle rod (16) is in an arc structure. The side of the pull rod (9) away from the handle (10) is rotatably installed on one side of the corresponding fixed seat (8) through a screw.

4. A standby high-voltage current-limiting fuse according to claim 3, characterized in that: An installation groove (17) is formed in the handle (10). An insertion hole (18) is formed on one side in the installation groove (17). A screw groove (19) is formed on the other side in the installation groove (17).

5. The backup type high voltage current limiting fuse according to claim 4, wherein: A metal elastic sheet (21) is fixedly installed on one side at the top of the first side plate (11). A clamping block (20) is fixedly installed on one side at the bottom of the second side plate (12). The first side plate (11) and the second side plate (12) are rotatably connected by a pin shaft, and the side of the first side plate (11) away from the second side plate (12) is inserted into the installation groove (17).

6. The backup type high voltage current limiting fuse according to claim 5, wherein: A button (22) is fixedly installed on one side of the insertion block (13). A counterbore is formed in the insertion block (13) and the button (22), and a connecting screw (23) is inserted into the second side plate (12) and the button (22). One side of the insertion block (13) is inserted into the insertion hole (18). One side of the connecting screw (23) is threadedly connected in the screw groove (19). A compression spring (24) is sleeved on the connecting screw (23) between one side in the installation groove (17) and the first side plate (11).

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