Circuit breaker for gas-insulated switchgear and gas-insulated switchgear

Abstract

The utility model discloses a circuit breaker with a self-lubricating function for a gas-insulated switchgear. According to the technical scheme, the circuit breaker comprises side plates arranged oppositely, an upper cross beam connected to the upper ends of the side plates, a driving shaft connected to the middles of the side plates and a lower cross beam connected to the lower ends of the side plates, the upper cross beam is provided with three-phase distributed static contacts, and the lower cross beam is provided with three-phase distributed moving contacts. The driving shaft is provided with a crank arm for driving the moving contact to act, the end part of the driving shaft is rotatably connected with the side plate through a self-lubricating shaft sleeve assembly, and the self-lubricating shaft sleeve assembly comprises a shaft sleeve, two bearings arranged in the shaft sleeve and oil seal pieces arranged at the two ends of the shaft sleeve.

Description

Technical Field

[0001] The utility model belongs to the electrical field, and in particular relates to a circuit breaker for a gas-insulated switchgear. Background Technology

[0002] The circuit breaker is a crucial component of a gas-insulated switchgear. Its structure includes: opposing side plates, an upper crossbeam connected to the upper part of the side plates, a drive shaft connected to the middle of the side plates, and a lower crossbeam connected to the lower end of the side plates. The upper crossbeam has stationary contacts arranged in a three-phase configuration, and the lower crossbeam has moving contacts arranged in a three-phase configuration. The drive shaft has a crank arm that actuates the moving contacts. Rotating the drive shaft causes the moving contacts to close or open with the stationary contacts. A drawback of traditional gas-insulated switchgear circuit breakers is that the drive shaft is connected to the side plates via a single-structure bushing, resulting in high rotational resistance and requiring frequent lubrication to maintain smooth operation. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a circuit breaker for gas-filled switchgear with self-lubricating function.

[0004] To solve the above problems, the technical solution adopted by this utility model includes: a side plate arranged opposite to each other, an upper crossbeam connected to the upper part of the side plate, a drive shaft connected to the middle part of the side plate, and a lower crossbeam connected to the lower part of the side plate. The upper crossbeam is provided with three-phase distributed stationary contacts, and the lower crossbeam is provided with three-phase distributed moving contacts. The drive shaft is provided with a crank arm that drives the moving contacts to move. The characteristic is that: the end of the drive shaft is rotatably connected to the side plate through a self-lubricating bushing assembly. The self-lubricating bushing assembly includes a bushing, two bearings disposed in the bushing, and oil seals disposed at both ends of the bushing. A positioning flange is provided in the bushing corresponding to the bearings. A coupling connected to the drive shaft is riveted in the bearing. The inner end of the coupling is provided with a square hole that sleeves with the drive shaft.

[0005] The circuit breaker for the gas-insulated switchgear is characterized in that: the side wall of the bushing is provided with external threads and the rear end is provided with a flange, and a sealing ring is provided inside the flange.

[0006] The circuit breaker for the gas-insulated switchgear is characterized in that: three independent crank arm mounting sleeves are provided outside the drive shaft, and the crank arm mounting sleeves are riveted or welded with hinge seats that are hinged to the crank arms.

[0007] The circuit breaker for the gas-insulated switchgear is characterized in that: the bushing is filled with lubricating oil.

[0008] The circuit breaker for the gas-insulated switchgear is characterized in that: the outer end face of the flange is provided with circumferentially arranged disassembly and assembly grooves.

[0009] The circuit breaker for the gas-insulated switchgear is characterized in that: the inner end face of the flange is provided with circumferentially arranged conical tips.

[0010] The circuit breaker for the gas-insulated switchgear is characterized in that: a retaining ring is provided at the outer end of the coupling.

[0011] An inflatable switchgear includes a cabinet body, characterized in that: a circuit breaker for an inflatable switchgear as described in any one of the above claims is installed inside the cabinet body.

[0012] The advantages of the circuit breaker and gas-insulated switchgear of this utility model are as follows: the drive shaft is rotatably connected to the side plate through a self-lubricating bushing assembly, which makes the rotation of the drive shaft smoother and can maintain a lubricated state for a long time.

[0013] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the circuit breaker for the gas-filled switchgear of this utility model;

[0015] Figure 2 This is a cross-sectional view of the circuit breaker for the gas-insulated switchgear of this utility model;

[0016] Figure 3 This is a structural schematic diagram of the self-lubricating bushing assembly of this utility model;

[0017] Figure 4 This is an exploded view of the circuit breaker for the gas-insulated switchgear of this utility model;

[0018] Figure 5 This is a schematic diagram of the structure of the crank arm mounting sleeve of this utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the bushing of this utility model;

[0020] Figure 7 This is a schematic diagram of the structure of the coupling of this utility model;

[0021] Figure 8 This is a structural schematic diagram of the gas-filled cabinet of this utility model. Detailed Implementation Example 1:

[0022] Reference Figure 1-7The gas-insulated switchgear circuit breaker of this utility model includes a side plate 1 arranged opposite to each other, an upper crossbeam 2 connected to the upper end of the side plate 1, a drive shaft 3 connected to the middle of the side plate 1, and a lower crossbeam 4 connected to the lower end of the side plate 1. The upper crossbeam 2 is provided with stationary contacts 6 distributed in three phases, and the lower crossbeam 4 is provided with moving contacts 7 distributed in three phases. The drive shaft 3 is provided with a crank arm 8 that drives the moving contacts 7. The end of the drive shaft 3 is rotatably connected to the side plate 1 via a self-lubricating bushing assembly 9. The self-lubricating bushing assembly 9 includes a bushing 10, two bearings 11 disposed within the bushing 10, and oil seals 12 disposed at both ends of the bushing 10. The oil seals 12 are rubber or metal parts. A positioning flange 13 is provided within the bushing 10 corresponding to the bearings, which positions the bearings 11 and simultaneously forms an oil reservoir between the bearings 11 for storing lubricating oil. In application, the bushing 10 is filled with lubricating oil. A coupling 14, connected to the drive shaft 3, is riveted inside the bearing 11. The inner end of the coupling 14 has a square hole 15 for engaging with the drive shaft 3. During assembly, the end of the drive shaft 3 is simply inserted into the square hole 15 of the coupling 14.

[0023] Preferably, the bushing 10 has an external thread 16 on its side wall that is threaded to the side plate 1, and a flange 17 is provided at the rear end of the bushing 10. A sealing ring 18 is provided inside the flange 17 to achieve a sealed connection between the bushing 10 and the side plate 1.

[0024] Preferably, the drive shaft 3 is provided with three independent crank arm mounting sleeves 19, and each crank arm mounting sleeve 19 is riveted or welded with a hinge seat 20 that is hinged to the crank arm 8. Compared with the traditional installation method of directly fixing the crank arm to the drive shaft 3, this installation method is simpler and has better strength.

[0025] Preferably, the outer end face of the flange 17 is provided with circumferentially arranged disassembly grooves 21. By inserting a corresponding disassembly tool into the disassembly groove 21, the bushing 10 can be rotated.

[0026] Preferably, the inner end face of the flange 17 is provided with circumferentially arranged tapered tips 22. When the bushing 10 is tightened, the tapered tips 22 penetrate the surface of the side plate 1 to prevent the bushing 10 from loosening.

[0027] Preferably, the outer end of the coupling 14 is provided with a retaining ring 23 to position the internal oil seal 12. Example 2:

[0028] Reference Figure 8The gas-filled cabinet of this utility model includes a cabinet body 24, and the gas-filled cabinet circuit breaker a described in Embodiment 1 is installed inside the cabinet body 24. The installation method is a known technology and will not be described in detail here.

[0029] The foregoing is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A circuit breaker for a gas-insulated switchgear, comprising a side plate (1) disposed opposite to each other, an upper crossbeam (2) connected to the upper end of the side plate (1), a drive shaft (3) connected to the middle of the side plate (1), and a lower crossbeam (4) connected to the lower end of the side plate (1), wherein the upper crossbeam (2) is provided with three-phase distributed stationary contacts (6), the lower crossbeam (4) is provided with three-phase distributed moving contacts (7), and the drive shaft (3) is provided with a crank arm (8) for driving the moving contacts (7) to move, characterized in that: The end of the drive shaft (3) is rotatably connected to the side plate (1) through a self-lubricating bushing assembly (9). The self-lubricating bushing assembly (9) includes a bushing (10), two bearings (11) disposed in the bushing (10), and oil seals (12) disposed at both ends of the bushing (10). A positioning flange (13) is provided in the bushing (10) corresponding to the bearings. A coupling (14) connected to the drive shaft (3) is riveted in the bearing (11). A square hole (15) is provided at the inner end of the coupling (14) to be sleeved with the drive shaft (3).

2. The circuit breaker for a gas-insulated switchgear according to claim 1, characterized in that: The bushing (10) has an external thread (16) on its side wall and a flange (17) at its rear end. A sealing ring (18) is provided inside the flange (17).

3. The circuit breaker for a gas-insulated switchgear according to claim 1, characterized in that: The drive shaft (3) is provided with three independent crank arm mounting sleeves (19), and the crank arm mounting sleeves (19) are riveted or welded with hinge seats (20) that are hinged to the crank arm (8).

4. The circuit breaker for a gas-insulated switchgear according to claim 1, characterized in that: The bushing (10) is filled with lubricating oil.

5. The circuit breaker for a gas-insulated switchgear according to claim 2, characterized in that: The flange (17) has circumferentially arranged disassembly and assembly grooves (21) on its outer end face.

6. The circuit breaker for a gas-insulated switchgear according to claim 1, characterized in that: The inner end face of the flange (17) is provided with circumferentially arranged conical tips (22).

7. The circuit breaker for a gas-insulated switchgear according to claim 1, characterized in that: The coupling (14) is provided with a retaining ring (23) at its outer end.

8. An air-filled cabinet, comprising a cabinet body (24), characterized in that: The cabinet (24) is equipped with a circuit breaker (a) for an inflatable cabinet as described in any one of claims 1-7.

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