On-load tap-changer with leakage-proof effect

Abstract

The utility model provides an on-load tap-changer with a leakage-proof effect, which relates to the technical field of oil leakage prevention of the on-load tap-changer, and comprises a handle, two straight gears are symmetrically and rotatably connected in the handle, a double-sided rack meshed with the two straight gears is inserted in the handle, and the double-sided rack is meshed with the two straight gears through the two straight gears and rotation of the two straight gears. Under the driving action of the connecting arm, the two arc-shaped blocks are rotated and opened, a worker can conveniently place the nut from the side edge of the nut on the tap switch, the nut on the tap switch can be clamped by the two arc-shaped blocks through reverse rotation of the straight gear, the arc-shaped blocks are driven by the handle to rotate to tighten the nut, and oil leakage of the tap switch is prevented.

Description

Technical Field

[0001] This utility model relates to the field of oil leakage prevention technology for on-load tap changers, and in particular to an on-load tap changer with leakage prevention effect. Background Technology

[0002] An on-load tap changer is a power device used to change the tap ratio of a transformer without interrupting power supply, thereby adjusting the transformer's output voltage. It consists of the switch body, the switch oil chamber (referred to as the oil chamber), and the tap selector (with or without a polarity selector). In actual operation, oil leakage may occur due to equipment or operating load problems, so it is necessary to tighten the nuts on the tap changer.

[0003] Therefore, the portable 10kV distribution transformer tap changer oil leakage prevention fastener, with publication number CN207415282U, firstly slides the slide cylinder out of the sleeve, aligns the first and second insertion holes, and passes the pin through the first and second insertion holes to fix the slide cylinder and sleeve together. Then, the sleeve is placed on the fastening nut of the tap changer, so that the flat boss on the inner wall of the sleeve contacts the notch of the fastening nut, allowing the sleeve to enclose the fastening nut. Then, the long handle is inserted into the third insertion hole at the top of the slide cylinder, and the long handle is rotated to tighten the fastening nut, thus solving the oil leakage problem.

[0004] Existing technology prevents oil leakage by tightening the tap changer nut. However, in actual operation, the sleeve needs to be fitted onto the nut perpendicular to its end face. Given the complex internal structure of the tap changer, difficulties may arise during nut installation. Specifically, the presence of other components inside the tap changer can affect the process of fitting the sleeve onto the nut. These components may occupy space, preventing the sleeve from fitting smoothly. In such cases, adjustments to the positions of other components or redesigning the sleeve's shape may be necessary to ensure proper fit. Utility Model Content

[0005] The purpose of this invention is to solve the problems existing in the prior art by proposing an on-load tap changer with leakage prevention effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an on-load tap changer with leakage prevention effect, comprising a handle, two spur gears symmetrically rotatably connected inside the handle, a double-sided rack inserted inside the handle and meshing with the two spur gears, a connecting arm fixedly connected to the tooth surface of the spur gears, the connecting arm extending outside the handle and fixedly connected to an arc-shaped block, the opposing inner arc surfaces of the two arc blocks combining to form a regular hexagon for clamping a fastening bolt, a pull rope penetrating through the outer arc surface of one of the arc blocks, one end of the pull rope extending to the connecting arm and the other end connected to a plug inserted into the end of the arc block away from the connecting arm, a spring piece connected between one side of the plug and one of the arc blocks, and the other side inserted into the end of the other arc block.

[0007] Preferably, the connecting arm is hollow near the arc-shaped block, and two limiting blocks for passing through the handle are symmetrically arranged in the hollow.

[0008] Preferably, spring rods are connected to both sides of the opposite surfaces of the two limiting blocks, and a spring piece is also provided near one of the spring rods. The middle and two ends of the spring piece in the hollow part of the connecting arm are respectively fixed to the connecting arm and the two limiting blocks.

[0009] Preferably, a wedge is inserted between the two limiting blocks, one side of the wedge extends outside the connecting arm, and a push rod for pushing the extension of the wedge is provided through the double-sided rack.

[0010] Preferably, the arc-shaped block is also hollow inside, and a clamping block is provided at each plane position on the inner arc surface of the arc-shaped block. Several threaded rods extending into the arc-shaped block are fixedly connected to one side of the clamping block, and a threaded sleeve that is threadedly connected to one of the threaded rods on the clamping block is rotatably connected inside the arc-shaped block.

[0011] Preferably, a bevel gear ring is fixedly connected to the outer wall of the threaded sleeve, and a double-headed bevel gear is rotatably connected to the arc-shaped block at the position of the bevel gear ring. One end of the double-headed bevel gear meshes with the bevel gear ring, and the other end extends to the outside of the arc-shaped block.

[0012] Preferably, a drive shaft is rotatably connected between the other ends of two adjacent double-headed bevel gear components outside the arc-shaped block. Three bevel gear blocks are distributed on the drive shaft located in the middle position, and the bevel gear block in the middle position meshes with the other end of the double-headed bevel gear component located in the middle position of the arc-shaped block. Two bevel gear blocks are distributed on the drive shafts located on both sides, and the two bevel gear blocks mesh with the other end of the double-headed bevel gear component located on the side of the arc-shaped block and with the bevel gear block at the end of the drive shaft located in the middle position, respectively.

[0013] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0014] 1. In this utility model, two spur gears are used to rotate, which, under the driving action of the connecting arm, enables the two arc-shaped blocks to rotate and open, making it easy for personnel to insert the nut on the tap changer from the side. Then, by rotating the spur gears in the opposite direction, the two arc-shaped blocks can clamp the nut on the tap changer. The handle is used to drive the arc-shaped blocks to rotate, thereby tightening the nut and preventing the tap changer from leaking oil.

[0015] 2. In this utility model, the three transmission shafts and bevel gear blocks set on the arc block can realize the simultaneous rotation of the three double-headed bevel gear components on the arc block. When the double-headed bevel gear components rotate, the bevel gear part located in the arc block will drive the bevel gear ring to rotate, thereby realizing the rotation of the threaded sleeve. This allows the threaded rod to drive the clamping block to move. By adjusting the position of the clamping block, it is convenient to use the clamping block to clamp the head of nuts of different sizes. Attached Figure Description

[0016] Figure 1 A three-dimensional structural diagram of an on-load tap changer with leakage prevention effect is provided for this utility model.

[0017] Figure 2 This invention proposes an on-load tap changer with leakage prevention effect. Figure 1 A schematic diagram of the cross-sectional structure;

[0018] Figure 3 This invention proposes an on-load tap changer with leakage prevention effect. Figure 2 A schematic diagram of the cross-sectional structure;

[0019] Figure 4 This is a schematic diagram of the internal structure of the connecting arm.

[0020] Legend: 1. Handle; 2. Connecting arm; 3. Pull rope; 4. Spur gear; 5. Arc block; 6. Clamping block; 7. Drive shaft; 8. Bevel gear block; 9. Double-headed bevel gear component; 10. Insert block; 11. Spring; 12. Push rod; 13. Double-sided rack; 14. Bevel gear ring; 15. Threaded sleeve; 16. Threaded rod; 17. Limiting block; 18. Spring rod; 19. Wedge block. Detailed Implementation

[0021] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0022] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0023] like Figure 1-4 As shown, an on-load tap changer with leakage prevention includes a handle 1. Two spur gears 4 are symmetrically rotatably connected inside the handle 1. A double-sided rack 13, meshing with the two spur gears 4, is inserted into the handle 1. A connecting arm 2 is fixedly connected to the tooth surface of the spur gears 4. The connecting arm 2 extends outside the handle 1 and is fixedly connected to an arc-shaped block 5. The opposing inner arc surfaces of the two arc-shaped blocks 5 combine to form a regular hexagon for clamping fastening bolts. A pull rope 3 is threaded through the outer arc surface of one of the arc-shaped blocks 5. One end of the pull rope 3 extends to the connecting arm 2, and the other end is connected to a plug 10 inserted into the end of the arc-shaped block 5 away from the connecting arm 2. A spring piece 11 is connected between one side of the plug 10 and one of the arc-shaped blocks 5, and the other side is inserted into the end of the other arc-shaped block 5.

[0024] In actual use, pushing the double-sided rack 13 causes the two spur gears 4 meshing with the rack 13 to rotate in opposite directions, thereby causing the two connecting arms 2 to swing (i.e., the included angle increases). Therefore, when the two connecting arms 2 swing, they will cause the corresponding arc-shaped blocks 5 to swing open, making it easier for personnel to insert the nut from the side. Then, pulling the double-sided rack 13 causes the spur gears 4 to rotate, thereby causing the connecting arms 2 to swing the arc-shaped blocks 5 to clamp the nut head. Then, releasing the pull rope 3, under the elastic force of the spring piece 11, pushes the insert block 10 to insert into another arc-shaped block 5, which can prevent the two arc-shaped blocks 5 from rotating open. Then, the two arc-shaped blocks 5 can be rotated by the handle 1, thereby tightening the nut on the tap changer.

[0025] Furthermore: The connecting arm 2 is hollow near the arc-shaped block 5, and two limiting blocks 17 for penetrating the handle 1 are symmetrically arranged in the hollow. Spring rods 18 are connected to both sides of the opposite face of the two limiting blocks 17, and a spring piece 11 is also provided near one of the spring rods 18. The middle and two ends of the spring piece 11 in the hollow of the connecting arm 2 are fixed to the connecting arm 2 and the two limiting blocks 17 respectively. A wedge 19 is inserted between the two limiting blocks 17. One side of the wedge 19 extends to the outside of the connecting arm 2, and a push rod 12 for pushing the extension of the wedge 19 is provided through the double-sided rack 13.

[0026] In actual use: When the two arc-shaped blocks 5 overlap and clamp the nut head, in order to prevent the arc-shaped blocks 5 from opening during the tightening of the nut, the extension end of the wedge block 19 can be pushed towards the arc-shaped block 5 by pushing the push rod 12. When moving, the two wedge blocks 19 are pushed to overcome the elastic force of the spring piece 11 and the elastic force of the spring rod 18 in this scheme, so that the two limit blocks 17 can move towards each other and be inserted into both sides of the handle 1 respectively, so that the relative position of the other end of the two arc-shaped blocks 5 can be fixed.

[0027] Furthermore: the interior of the arc-shaped block 5 is also hollow, and a clamping block 6 is provided at each plane position on the inner arc surface of the arc-shaped block 5. Several threaded rods 16 extending into the arc-shaped block 5 are fixedly connected to one side of the clamping block 6. A threaded sleeve 15 is rotatably connected to one of the threaded rods 16 on the clamping block 6 inside the arc-shaped block 5. A bevel gear ring 14 is fixedly connected to the outer wall of the threaded sleeve 15. A double-headed bevel gear component 9 is rotatably connected through the bevel gear ring 14 outside the arc-shaped block 5 at the position of the bevel gear ring 14. One bevel gear of the double-headed bevel gear component 9 meshes with the bevel gear ring 14. The other end extends beyond the arc-shaped block 5. A drive shaft 7 is rotatably connected between the other ends of two adjacent double-headed bevel gear components 9 outside the arc-shaped block 5. Three bevel gear blocks 8 are distributed on the drive shaft 7 located in the middle position, and the bevel gear block 8 in the middle position meshes with the other end of the double-headed bevel gear component 9 located in the middle position of the arc-shaped block 5. Two bevel gear blocks 8 are distributed on the drive shafts 7 located on both sides, and the two bevel gear blocks 8 mesh with the other end of the double-headed bevel gear component 9 located on the side of the arc-shaped block 5 and with the bevel gear block 8 at the end of the drive shaft 7 located in the middle position, respectively.

[0028] In practical use, for other sizes of nut heads, such as Figure 1 and Figure 3 As shown, by rotating the drive shaft 7 located in the middle of the arc-shaped block 5, the bevel gear blocks 8 at both ends and the middle of its surface can be rotated. The bevel gear block 8 at the middle of the drive shaft 7 will drive the double-headed bevel gear 9 located in the middle of the arc-shaped block 5 to rotate. The bevel gear blocks 8 at both ends will drive the bevel gear block 8 at one end of the drive shaft 7 on the side of the arc-shaped block 5 to rotate. Under the driving action of the side drive shaft 7, the bevel gear block 8 at the other end of the side drive shaft 7 will rotate, thereby realizing the rotation of the double-headed bevel gear 9 located on the side of the arc-shaped block 5. That is, by setting three drive shafts 7 and bevel gear blocks 8 on the arc-shaped block 5, the three double-headed bevel gear 9 on the arc-shaped block 5 can be rotated simultaneously. When the double-headed bevel gear 9 rotates, the bevel gear part located in the arc-shaped block 5 will drive the bevel gear ring 14 to rotate, thereby realizing the rotation of the threaded sleeve 15. This will enable the threaded rod 16 to drive the clamping block 6 to move. By adjusting the position of the clamping block 6, it is convenient to use the clamping block 6 to clamp the head of nuts of different sizes.

[0029] Working principle: Adjust the position of the clamping block 6 inside the arc-shaped block 5 according to the size of the nut head to be tightened, push the double-sided rack 13, and realize that the two spur gears 4 meshing with the double-sided rack 13 rotate in opposite directions, thereby realizing the swing of the two connecting arms 2 (i.e., the included angle increases). Therefore, when the two connecting arms 2 swing, they will drive the corresponding arc-shaped block 5 to swing open. The personnel are inserted from the side of the nut, and then the double-sided rack 13 is pulled to realize the rotation of the spur gear 4, thereby realizing that the connecting arm 2 drives the arc-shaped block 5 to swing to clamp the nut head. Then, release the pull rope 3, and under the elastic force of the spring piece 11, push the insert block 10 to insert into the other arc-shaped block 5, which can prevent the two arc-shaped blocks 5 from rotating open. Then, the two arc-shaped blocks 5 can be rotated by the handle 1, thereby realizing the tightening of the nut on the tap changer.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An on-load tap changer with leakage prevention effect, characterized in that: Includes a handle (1), and two spur gears (4) are symmetrically rotatably connected inside the handle (1); The handle (1) is fitted with a double-sided rack (13) that meshes with two spur gears (4). The tooth surface of the spur gears (4) is fixedly connected to a connecting arm (2). The connecting arm (2) extends out of the handle (1) and is fixedly connected to an arc-shaped block (5). The two arc blocks (5) are combined with their inner arc surfaces to form a regular hexagon and are used to clamp the fastening bolt. A pull rope (3) is provided through the outer arc surface of one of the arc blocks (5). One end of the pull rope (3) extends to the connecting arm (2), and the other end is connected to a plug (10) inserted into the arc block (5) away from the connecting arm (2). One side of the insert (10) is connected to one of the arc-shaped blocks (5) by a spring piece (11), and the other side is inserted into the end of another arc-shaped block (5).

2. The on-load tap changer with leakage prevention effect according to claim 1, characterized in that: The connecting arm (2) is hollow near the arc-shaped block (5), and two limiting blocks (17) for passing through the handle (1) are symmetrically arranged in the hollow.

3. The on-load tap changer with leakage prevention effect according to claim 2, characterized in that: Both sides of the two limiting blocks (17) are connected to spring rods (18), and a spring piece (11) is also provided near one of the spring rods (18). The middle part and two ends of the spring piece (11) in the hollow part of the connecting arm (2) are fixed to the connecting arm (2) and the two limiting blocks (17) respectively.

4. The on-load tap changer with leakage prevention effect according to claim 2, characterized in that: A wedge (19) is inserted between the two limiting blocks (17), one side of the wedge (19) extends outside the connecting arm (2), and a push rod (12) for pushing the extension of the wedge (19) is provided through the double-sided rack (13).

5. The on-load tap changer with leakage prevention effect according to claim 1, characterized in that: The arc-shaped block (5) is also hollow inside, and a clamping block (6) is provided at each plane position on the inner arc surface of the arc-shaped block (5). Several threaded rods (16) extending into the arc-shaped block (5) are fixedly connected to one side of the clamping block (6). A threaded sleeve (15) that is threadedly connected to one of the threaded rods (16) on the clamping block (6) is rotatably connected inside the arc-shaped block (5).

6. The on-load tap changer with leakage prevention effect according to claim 5, characterized in that: The outer wall of the threaded sleeve (15) is fixedly connected to a bevel gear ring (14). The arc block (5) is rotatably connected to a double-headed bevel gear component (9) located outside the bevel gear ring (14). One end of the double-headed bevel gear component (9) meshes with the bevel gear ring (14), and the other end extends to the outside of the arc block (5).

7. The on-load tap changer with leakage prevention effect according to claim 6, characterized in that: The arc-shaped block (5) is rotatably connected to the other end of two adjacent double-headed bevel gear pieces (9). Three bevel gear blocks (8) are distributed on the transmission shaft (7) located in the middle position, and the bevel gear block (8) in the middle position meshes with the other end of the double-headed bevel gear piece (9) located in the middle position of the arc-shaped block (5). Two bevel gear blocks (8) are distributed on the transmission shafts (7) located on both sides, and the two bevel gear blocks (8) mesh with the other end of the double-headed bevel gear piece (9) located on the side of the arc-shaped block (5) and with the bevel gear block (8) at the end of the transmission shaft (7) in the middle position, respectively.

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