Three-position grounding switch

Abstract

The utility model relates to the technical field of high-voltage switches, in particular to a three-station grounding switch. Comprising a shell, the shell is of a horn-shaped structure, the front end of the shell is provided with a flange, the rear portion of the shell is connected with a driving device, three moving arc contacts are installed at the front ends of three moving contact rods respectively, the three moving contact rods are fixedly connected with a connecting plate, the tail end of the middle moving contact rod is connected with the driving device, one side of a guide contact is provided with a guide hole, and the other side of the guide contact is provided with a connecting plate. And the moving contact rod passes through a guide hole of the guide contact, the other side of the guide contact is fixedly connected with the grounding insulator, and the grounding insulator is fixed on the shell. Compared with the prior art, the grounding insulator is arranged on the trumpet-shaped shell and is connected with the moving contact rod through the guide contact, so that the number of parts is reduced, the structure is simple, convenient and reliable, the space occupied by the whole structure is small, and the miniaturization design of equipment is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of high-voltage switches, in particular to a three-position grounding switch. Background Art

[0002] Gas-insulated metal-enclosed switchgear is one of the important power transmission and transformation equipment for the power grid. Its safety and reliability are crucial to the safe operation of the power grid. The function of the grounding switch in the gas-insulated metal-enclosed switchgear is: when a leakage occurs in the casing of the electrical equipment, the grounding switch can cut off the grounding circuit in time to prevent the current from passing through the human body, ensure personal safety, avoid the expansion of the fault, and protect the safe operation of the power equipment.

[0003] Existing grounding switch structures, such as the grounding switch assembly in a gas-insulated metal-enclosed switchgear disclosed in publication number CN203491176U, have a rectangular grounding switch housing that occupies a large space, and the grounding switch contacts are connected to the grounding insulator via a copper busbar. There are many parts and components, making installation complex. Summary of the Invention

[0004] The utility model provides a three-position grounding switch to overcome the deficiencies of the prior art.

[0005] To achieve the above-mentioned purpose, a three-position grounding switch is designed, comprising a shell, the shell being a trumpet-shaped structure, a flange being provided at the front end of the shell, the rear end of the shell being connected to a driving device, three moving arc contacts being respectively mounted at the front ends of three moving contact rods, the three moving contact rods being fixedly connected to a connecting plate, the tail end of the middle moving contact rod being connected to the driving device, a guide hole being provided on one side of the guide contact, the moving contact rod passing through the guide hole of the guide contact, the other side of the guide contact being fixedly connected to a grounding insulator, and the grounding insulator being fixed to the shell.

[0006] A plurality of grooves are provided in the guide hole of the guide contact, an annular spring is arranged in the groove, and the moving contact rod passes through the annular spring.

[0007] A mounting hole is provided on the other side of the guide contact, which is fixedly connected to the grounding insulator through the mounting hole with screws.

[0008] The tail of the middle moving contact rod is rotatably connected to one end of the connecting block, the other end of the connecting block is rotatably connected to one end of the crank arm, and the other end of the crank arm is fixedly connected to the rotating shaft, which is driven to rotate by the driving device.

[0009] The driving device is a servo motor.

[0010] Compared with the prior art, the utility model sets the grounding insulator on the trumpet-shaped housing and connects it with the moving contact rod through a guide contact, which reduces the number of parts, has a simple structure, is convenient and reliable, and the overall structure occupies less space, which is conducive to the miniaturization design of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is the main purpose of the present invention.

[0012] Figure 2 It is a bottom view of the present utility model.

[0013] Figure 3 It is a right view of the utility model.

[0014] Figure 4 Schematic diagram of the guide contact.

[0015] Figure 5 Schematic diagram of an annular spring.

[0016] Figure 6 This is a schematic diagram of the arcing contact extended state.

[0017] Figure 7 Schematic diagram of the moving arc contact retracted state.

[0018] Figure 8 This is a schematic diagram of the use of the present invention.

[0019] See also Figures 1-8 , where 1 is the housing, 1-1 is the flange, 2 is the drive device, 3 is the moving arc contact, 4 is the moving contact rod, 5 is the connecting plate, 6 is the guide contact, 6-1 is the guide hole, 6-2 is the groove, 6-3 is the annular spring, 6-4 is the mounting hole, 7 is the grounding insulator, 8 is the connecting block, 9 is the crank arm, 10 is the rotating shaft, 11 is the gas-insulated metal-enclosed switch, and 11-1 is the static contact. DETAILED DESCRIPTION

[0020] The present invention will be further described below with reference to the accompanying drawings.

[0021] like Figure 1-Figure 7As shown, the shell 1 is a trumpet-shaped structure. The front end of the shell 1 is provided with a flange 1-1. The rear part of the shell 1 is connected to the driving device 2. The three moving arc contacts 3 are respectively installed at the front ends of the three moving contact rods 4. The three moving contact rods 4 are fixedly connected to a connecting plate 5. A guide hole 6-1 is provided on one side of the guide contact 6. The moving contact rod 4 passes through the guide hole 6-1 of the guide contact 6. The driving device 2 drives the middle moving contact rod 4 to move back and forth along the guide hole 6-1. The other side of the guide contact 6 is fixedly connected to the grounding insulator 7. The grounding insulator 7 is fixed on the shell 1. The grounding insulator 7 is connected to the external ground. The moving contact rod 4 is arranged in the through hole on one side of the guide contact 6, and the other side is directly fixedly connected to the grounding insulator 7. The conduction is carried out through the guide contact 6, which reduces the number of intermediate connecting parts and makes the structure simpler and more reliable. As shown Figure 6 As shown, the moving arc contact 3 can be provided with a mounting hole and fixed to the front end of the moving contact rod 4 by screws. At the same time, the connecting plate 5 is pressed and fixed to the front end of the moving contact rod 4 by the moving arc contact 3. The connecting plate 5 enables the three moving contact rods 4 to move synchronously, and the driving device 2 drives the moving contact rod 4 to move for a quick grounding operation.

[0022] The guide contact 6 has a plurality of annular grooves 6-2, and an annular spring 6-3 is provided in the groove 6-2. The moving contact rod 4 passes through the annular spring 6-3. The structure of the annular spring 6-3 is as follows: Figure 5 As shown, it refers to an annular spring structure formed by connecting the head and tail ends of a cylindrical coil spring to each other. After being placed in the annular groove 6-2, it can apply a centripetal elastic force to the moving contact rod 4. The annular spring 6-3 is made of metal material and contacts the moving contact rod 4 for electrical conduction. Multiple annular springs 6-3 can ensure the axial positioning of the guide contact 6 and can float when the static contact 11-1 is inserted.

[0023] The other side of the guide contact 6 is provided with a mounting hole 6-4, which is screwed through the mounting hole 6-4 to be fixedly connected to the ground insulator 7. The guide contact 6 is directly in electrical contact with the ground insulator 7 and is fastened with screws for easy installation and removal.

[0024] The tail of the middle moving contact rod 4 is rotatably connected to one end of the connecting block 8, the other end of the connecting block 8 is rotatably connected to one end of the crank arm 9, the other end of the crank arm 9 is fixedly connected to the rotating shaft 10, and the rotating shaft 10 is driven to rotate by the driving device 2. The driving device 2 drives the rotating shaft 10 to drive the crank arm 9 to rotate, and the crank arm 9 drives the connecting block 8 to move, and the connecting block 8 drives the moving contact rod 4 to move back and forth. Since the two ends of the connecting block 8 are rotatably connected, the angle can be automatically adjusted between the back and forth movement of the moving contact rod 4 and the circular motion of the crank arm 9 to prevent jamming. The two ends of the connecting block 8 can be rotatably connected to the tail of the moving contact rod 4 and the crank arm 9 respectively through a pin structure, and the connection structure is reliable.

[0025] The driving device 2 is a servo motor, which is convenient for controlling the angle of rotation of the rotating shaft 10.

[0026] When the utility model is used, Figure 8 As shown, the housing 1 is mounted on one side of the gas-insulated metal-enclosed switch 11 through the flange 2. The driving device 2 drives the middle moving contact rod 4 to extend, and the connecting plate 5 enables the three moving contact rods 4 to be linked. The moving arcing contact 3 contacts and conducts with the corresponding static contact 11-1 in the gas-insulated metal-enclosed switch 11. The moving contact rod 4 is grounded through the guide contact 6 and the grounding insulator 7, thereby realizing rapid grounding of the grounding switch.

Claims

1. A three-position grounding switch, comprising a housing, characterized in that: The housing (1) is a trumpet-shaped structure. The front end of the housing (1) is provided with a flange (1-1). The rear part of the housing (1) is connected to the driving device (2). Three moving arc contacts (3) are respectively installed at the front ends of three moving contact rods (4). The three moving contact rods (4) are fixedly connected to a connecting plate (5). A guide hole (6-1) is provided on one side of the guide contact (6). The moving contact rod (4) passes through the guide hole (6-1) of the guide contact (6). The driving device (2) drives the middle moving contact rod (4) to move forward and backward along the guide hole (6-1). The other side of the guide contact (6) is fixedly connected to the grounding insulator (7). The grounding insulator (7) is fixed to the housing (1).

2. The three-position grounding switch according to claim 1, characterized in that: A plurality of annular grooves (6-2) are provided in the guide hole (6-1) of the guide contact (6), an annular spring (6-3) is provided in the groove (6-2), and the moving contact rod (4) passes through the annular spring (6-3).

3. The three-position grounding switch according to claim 1, characterized in that: The other side of the guide contact (6) is provided with a mounting hole (6-4), which is fixedly connected to the grounding insulator (7) by means of screws passing through the mounting hole (6-4).

4. The three-position grounding switch according to claim 1, characterized in that: The tail of the middle moving contact rod (4) is rotatably connected to one end of the connecting block (8), the other end of the connecting block (8) is rotatably connected to one end of the crank arm (9), the other end of the crank arm (9) is fixedly connected to the rotating shaft (10), and the rotating shaft (10) is driven to rotate by the driving device (2).

5. The three-position grounding switch according to claim 4, characterized in that: The driving device (2) is a servo motor.

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