High-voltage switch cabinet anti-lock grounding knife switch
By adopting a sliding contact structure between the moving and stationary contacts and a push rod handle design in the grounding switch of the high-voltage switchgear, the problem of jamming and seizing caused by corrosion of the grounding switch is solved, achieving stable and reliable grounding operation and improving ease of use and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANDAN IRON & STEEL GROUP CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-08-04
AI Technical Summary
The grounding switches of existing high-voltage switchgear are prone to jamming and seizing due to corrosion, and the fixing effect after closing is poor, posing a safety hazard.
A high-voltage switchgear anti-lock grounding switch was designed, which adopts a sliding contact structure between the moving contact and the stationary contact. The connection stability is enhanced by the top spring and the convex point embedded in the groove, and the opening and closing operation is achieved by the push rod and the handle.
This effectively avoids the phenomenon of moving contacts seizing up, improves the reliability and safety of the connection, ensures reliable grounding of the high-voltage switchgear, and enhances ease of use and operational safety.
Smart Images
Figure CN224595429U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a grounding switch for a high-voltage switchgear, belonging to the technical field of high-voltage switchgear equipment. Background Technology
[0002] Grounding switch is an important electrical device, mainly used to isolate equipment from the power system during equipment maintenance or fault handling to ensure the safety of personnel and equipment. It is usually installed in the distribution cabinet to achieve the grounding function when the incoming line of the high voltage switch cabinet is a handcart type or cable incoming line. The correct operation of the grounding switch is crucial to maintaining the stability and safety of the power system.
[0003] Chinese Patent Publication No. CN215644257U discloses a grounding switch, which includes an insulating column, a fixed base, a support frame, and a switch rod. The fixed base is mounted on the insulating column, and the support frame is connected to the fixed base. The support frame supports the switch rod when it falls, preventing it from loosening due to repeated closing and effectively extending its service life. This grounding switch has the following shortcomings: First, after a period of use, the grounding switch is prone to corrosion, leading to jamming, difficulty in opening and closing, and even seizing. Its anti-seizing performance is poor, making the switch prone to seizing and affecting the energization of the high-voltage switchgear. Second, the switch's fixation after closing is poor. After prolonged use, the switch may loosen due to vibration or other reasons, causing the grounding function to be shut down and increasing the maintenance risk of the switchgear. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an anti-lock grounding switch for high-voltage switchgear. This grounding switch can prevent the switch from jamming and locking due to corrosion, ensuring that the high-voltage switchgear can be energized smoothly, improving ease of use, and improving the connection effect between the moving contact and the stationary contact. This can prevent the switch from loosening and accidentally opening, improve the reliability of grounding, and ensure the operational safety of maintenance personnel.
[0005] The technical solution to the above technical problem is:
[0006] A high-voltage switchgear anti-lock grounding switch includes a base, insulator, connecting plate, stationary contact, bottom plate, gate arm support plate, rotating shaft, gate arm, moving contact frame, moving contact, top spring, push rod, and handle. The base is rectangular. The lower end of the insulator is fixed to the upper surface of the base, and the upper end of the insulator is connected to one end of the connecting plate. The other end of the connecting plate is connected to the stationary contact, which is an upright rectangular plate. The bottom plate is rectangular and fixed to one side of the base. Two gate arm support plates are vertically fixed to the upper surface of the bottom plate. The two gate arm support plates are parallel, and each of the two gate arm support plates has a shaft hole at its center. The two ends of the rotating shaft are fixed in the shaft holes of the two gate arm support plates. The gate arm is a rectangular straight rod with a rotating hole at its lower end. The rotating hole at the end is fitted onto the rotating shaft between the two gate arm support plates. The gate arm and the rotating shaft are in a rotating fit. The upper end of the gate arm is connected to the moving contact frame. The moving contact frame is an upright square plate frame. The two moving contacts are rectangular plates. The two moving contacts are placed vertically and parallel inside the plate frame of the moving contact frame. The inner sides of the top and bottom surfaces of the moving contact frame on the outer side of the two moving contacts have sliding grooves. Four top springs are placed in the sliding grooves. The front ends of the four top springs are respectively connected to the outer sides of the two moving contacts. The stationary contact extends into the frame of the moving contact frame. The top springs push and clamp the two moving contacts on both sides of the stationary contact. The top surface of the frame of the moving contact frame has a round hole. The push rod is inserted into the round hole. The push rod and the round hole are in a sliding fit. The handle is fixed to the upper end of the push rod.
[0007] In the aforementioned high-voltage switchgear anti-lock grounding switch, the upper and lower ends of the two moving contacts are respectively fixedly connected to sliders. The sliders are embedded in the sliding grooves on the inner side of the top and bottom surfaces of the moving contact frame. The top spring is pressed against the outer side of the slider, and the slider and the sliding groove are in sliding fit.
[0008] The aforementioned high-voltage switchgear anti-lock grounding switch has grooves on both sides of the front of the stationary contact. The grooves are along the length of the stationary contact and open at the front end of the stationary contact. The cross-section of the groove is semi-circular. The two moving contacts have hemispherical protrusions on one side opposite the stationary contact. The protrusions are opposite to the grooves on both sides of the stationary contact. The protrusions of the moving contacts are embedded in the grooves of the stationary contacts, and the protrusions of the moving contacts and the grooves of the stationary contacts are in a sliding fit.
[0009] In the aforementioned high-voltage switchgear anti-lock grounding switch, the two moving contacts have protruding push blocks on opposite sides of their upper parts. The upper end of the push blocks is an inclined surface. The lower end of the push rod inserted on the top surface of the moving contact frame has a top block. The lower end of the top block is triangular, and the triangular lower end of the top block matches and aligns with the inclined surfaces of the push blocks on the inner sides of the two moving contacts.
[0010] The handle at the upper end of the push rod of the aforementioned high-voltage switchgear anti-lock grounding switch is an insulator.
[0011] The beneficial effects of this utility model are:
[0012] In this invention, the lower end of the gate arm is rotatably fixed between two gate arm support plates. The gate arm can rotate via a rotating shaft, causing the moving contact at the upper end of the gate arm to move, allowing the moving contact to be tightly connected with the stationary contact. The upper and lower ends of the moving contact brackets on the outer sides of the two moving contacts have sliding grooves, in which top springs are installed. The top springs can push the moving contacts towards the center, allowing the moving contacts to clamp the stationary contact with elastic force, preventing the moving contacts from seizing the stationary contact. Grooves are provided on both sides of the stationary contact, and protrusions are embedded in the contact surfaces of the two moving contacts and the stationary contact. The groove in the stationary contact enhances the connection between the moving and stationary contacts, preventing the disconnector from loosening and improving the grounding reliability of the high-voltage switchgear. The upper end of the push block inside the two moving contacts is inclined, and the lower end of the top block at the bottom of the push rod is triangular. The triangular lower end of the top block can be inserted between the two push blocks to separate the moving contacts connected on both sides of the two push blocks, avoiding the phenomenon of the moving and stationary contacts seizing and unable to disconnect, thus achieving the purpose of disconnecting the grounding. The handle at the top of the push rod is an insulator, ensuring the safety of operators when opening and closing the switch.
[0013] This utility model has a simple structure and is easy to use. It can avoid the situation of knife switch seizing, ensure that the high-voltage switchgear can be energized smoothly, improve the ease of use, and at the same time improve the connection effect between the moving contact and the stationary contact, which can prevent the knife switch from loosening and accidentally opening, improve the reliability of grounding, and ensure the operation safety of maintenance personnel. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 yes Figure 1 The front view;
[0016] Figure 3 yes Figure 1 Side view;
[0017] Figure 4 yes Figure 3 An enlarged schematic diagram of the structure at point A.
[0018] The following components are marked in the diagram: 1. Base; 2. Insulator; 3. Connecting plate; 4. Stationary contact; 5. Base plate; 6. Gate arm support plate; 7. Rotating shaft; 8. Gate arm; 9. Moving contact frame; 10. Moving contact; 11. Top spring; 12. Push rod; 13. Handle; 14. Sliding groove; 15. Sliding block; 16. Round hole; 17. Groove; 18. Protrusion; 19. Push block; 20. Top block. Detailed Implementation
[0019] This utility model consists of: a base 1, an insulator 2, a connecting plate 3, a stationary contact 4, a base plate 5, a gate arm support plate 6, a rotating shaft 7, a gate arm 8, a moving contact frame 9, a moving contact 10, a top spring 11, a push rod 12, a handle 13, a slider 15, a groove 17, a protrusion 18, a push block 19, and a top block 20.
[0020] Figure 1 , 2 The display shows that the base 1 is a cuboid, and the lower end of the insulator 2 is fixed to the upper surface of the base 1. The upper end of the insulator 2 is connected to one end of the connecting plate 3, and the other end of the connecting plate 3 is connected to the stationary contact 4, which is an upright cuboid plate. The stationary contact 4 is fixed to the upper end of the base 1 through the connecting plate 3 and the insulator 2, maintaining insulation from the outside environment. The stationary contact 4 is connected to the connecting plate 3 through a wire, and the connection between the stationary contact 4 and the moving contact 10 grounds the high-voltage switchgear.
[0021] Figure 1 , 2 The display shows that the base plate 5 is a rectangular plate, fixedly connected to one side of the base 1. Two gate arm support plates 6, also square plates, are vertically fixed to the upper surface of the base plate 5. The two gate arm support plates 6 are parallel and have shaft holes at their centers. The two ends of the rotating shaft 7 are respectively fixed into the shaft holes of the two gate arm support plates 6. The gate arm 8 is a rectangular straight rod with a rotating hole at its lower end. The rotating hole of the gate arm 8 is fitted onto the rotating shaft 7 between the two gate arm support plates 6, forming a rotatable fit between the gate arm 8 and the rotating shaft 7. The gate arm 8 can rotate around the rotating shaft 7, causing the moving contact 10 to move and open / close with the stationary contact 4.
[0022] Figure 1 , 2 The display shows that the upper end of the gate arm 8 is connected to the moving contact frame 9, which is an upright square plate frame. The two moving contacts 10 are rectangular plates, placed vertically and parallel within the plate frame of the moving contact frame 9. The moving contacts 10 and the moving contact frame 9 are connected by wires. There is a gap between the two moving contacts 10, which matches the thickness of the stationary contact 4. The stationary contact 4 can be inserted between the two moving contacts 10 to make contact and achieve electrical continuity.
[0023] Figure 3 , 4The diagram shows that the top and bottom inner surfaces of the moving contact frame 9 on the outer sides of the two moving contacts 10 each have sliding grooves 14. Four top springs 11 are placed in the sliding grooves 14. Slider blocks 15 are fixedly connected to the upper and lower ends of the two moving contacts 10, respectively. The sliders 15 are embedded in the sliding grooves 14 on the top and bottom inner surfaces of the moving contact frame 9. The top springs 11 press against the outer side of the sliders 16, and the sliders 15 and sliding grooves 14 are in sliding engagement. The top springs 11 can push the moving contacts 10 towards the center, enabling the moving contacts 10 to clamp the stationary contact 4, ensuring the reliability of the connection between the stationary contact 4 and the moving contacts 10. Simultaneously, the moving contacts 10 can clamp the stationary contact 4 through the elastic force of the top springs 11, preventing the moving contacts 10 from seizing the stationary contact 4.
[0024] Figure 3 , 4 As shown, to ensure a more stable connection between the stationary contact 4 and the moving contact 10, grooves 17 and protrusions 18 are provided between them for connection. Grooves 17 are provided on both sides of the front of the stationary contact 4, extending along its length. The grooves 17 open at the front end of the stationary contact 4, and their cross-section is semi-circular. Correspondingly, each of the two moving contacts 10 has a hemispherical protrusion 18 on one side opposite the stationary contact 4. The protrusions 18 of the moving contacts 10 correspond to the grooves 17 on both sides of the stationary contact 4, and the hemispherical shape of the protrusions 18 matches the curvature of the grooves 17. When the stationary contact 4 and the moving contact 10 are connected, the protrusions 18 of the moving contacts 10 are embedded in the grooves 17 of the stationary contact 4, forming a sliding fit.
[0025] Figure 1 , 2 The display shows that the top surface of the moving contact frame 9 has a circular hole 16, into which the push rod 12 is inserted. The push rod 12 and the circular hole 16 are in a sliding fit. The handle 13 is fixed to the upper end of the push rod 12 and is an insulator. The operator can move the moving contact frame 9 by using the handle 13 and the push rod 12 to realize the insertion and separation of the moving contact 10 and the stationary contact 4. The insulator nature of the handle 13 ensures the safety of the operator when opening and closing the circuit breaker.
[0026] Figure 3 , 4As shown, each of the two moving contacts 10 has a protruding push block 19 on its upper opposite side, with the upper end of the push block 19 being an inclined surface. The lower end of the push rod 12 inserted into the top surface of the moving contact frame 9 has a top block 20, the lower end of which is triangular. This triangular lower end of the top block 20 matches and aligns with the inclined surfaces of the push blocks 19 on the inner sides of the two moving contacts 10. The function of the push blocks 10 and the top blocks 20 is to facilitate the separation of the moving contacts 10 from the stationary contacts 4, preventing the moving contacts 10 from seizing and becoming unable to disengage from the stationary contacts 4. With the stationary contact 4 and the moving contact 10 in the plugged state, the top spring 11 presses the moving contact 10 and the stationary contact 4 tightly together. When it is necessary to separate the moving contact 10 from the stationary contact 4, push the push rod 12 downward. The triangular base of the top block 20 at the lower end of the push rod 12 is inserted between the push blocks 19 on the sides of the two moving contacts 10, pushing the two push blocks 19 to the sides. The two push blocks 19 drive the two moving contacts 10 to move to the sides and separate from the stationary contact 4. Then, by pulling the moving contact frame 9 outward with the handle 13 and the push rod 12, the connection between the stationary contact 4 and the moving contact 10 can be broken.
[0027] The usage process of this utility model is as follows:
[0028] When grounding the high-voltage switchgear, the moving contact frame 9 can be pushed forward using the handle 13 and push rod 12. The switch rod 8 at the lower end of the moving contact frame 9 rotates around the rotating shaft 7, causing the moving contact 10 to move. The two moving contacts 10 then engage with the stationary contact 4 to complete the closing operation and ground the high-voltage switchgear, facilitating maintenance and repair. During closing, the protrusion 18 on the side of the moving contact 10 can be engaged into the groove 17 on the side of the stationary contact under the elastic force of the top spring 11, improving the engagement stability of the moving contact 10 and the stationary contact 4 and preventing accidental loosening of the moving contact 10.
[0029] When opening the gate, the push rod 12 can be pressed by the handle 13. The triangular base of the top block 21 at the lower end of the push rod 12 is inserted between the push blocks 19 on the side of the two moving contacts 10, pushing the two moving contacts 10 away from each other against the elastic force of the top spring 11, so that the moving contacts 10 are smoothly separated from the stationary contacts 4, preventing the gate from locking up when opening and improving the safety of use.
Claims
1. A high-voltage switchgear anti-lock grounding switch, characterized in that: It includes a base (1), an insulator (2), a connecting plate (3), a stationary contact (4), a base plate (5), a gate arm support plate (6), a rotating shaft (7), a gate arm (8), a moving contact frame (9), a moving contact (10), a top spring (11), a push rod (12), and a handle (13). The base (1) is a cuboid. The lower end of the insulator (2) is fixed to the upper surface of the base (1). The upper end of the insulator (2) is connected to one end of the connecting plate (3), and the other end of the connecting plate (3) is connected to the stationary contact (4). The stationary contact (4) is an upright cuboid plate, and the base plate (5) is a rectangular plate. The base plate (5) is fixedly connected to one side of the base (1). Two gate rod support plates (6) are vertically fixedly connected to the upper surface of the base plate (5). The two gate rod support plates (6) are parallel, and the center of each of the two gate rod support plates (6) has a shaft hole. The two ends of the rotating shaft (7) are fixed in the shaft holes of the two gate rod support plates (6). The gate rod (8) is a rectangular straight rod. The lower end of the gate rod (8) has a rotating hole. The rotating hole at the lower end of the gate rod (8) is fitted into the two gate rod support plates (6). On the rotating shaft (7) between the rod support plate (6), the gate rod (8) and the rotating shaft (7) are in rotational engagement. The upper end of the gate rod (8) is connected to the moving contact frame (9). The moving contact frame (9) is an upright square plate frame. The two moving contacts (10) are rectangular plates. The two moving contacts (10) are placed vertically and parallel inside the plate frame of the moving contact frame (9). The top and bottom inner surfaces of the moving contact frame (9) outside the two moving contacts (10) have sliding grooves (14). Four top springs (11) are placed on the sliding grooves. In the moving groove (14), the front ends of the four top springs (11) are respectively connected to the outer sides of the two moving contacts (10). The front end of the stationary contact (4) extends into the frame of the moving contact frame (9). The top springs (11) push the two moving contacts (10) to clamp them on both sides of the stationary contact (4). There is a round hole (16) on the top surface of the frame of the moving contact frame (9). The push rod (12) is inserted into the round hole (16). The push rod (12) and the round hole (16) are in sliding fit. The handle (13) is fixed on the upper end of the push rod (12).
2. The anti-lock grounding switch of the high-voltage switchgear according to claim 1, characterized in that: The upper and lower ends of the two moving contacts (10) are respectively fixedly connected to sliders (15). The sliders (15) are embedded in the sliding grooves (14) on the inner side of the top and bottom surfaces of the moving contact frame (9). The top spring (11) is pressed against the outside of the slider (15). The slider (15) and the sliding groove (14) are in sliding fit.
3. The anti-lock grounding switch of the high-voltage switchgear according to claim 1, characterized in that: The stationary contact (4) has grooves (17) on both sides of its front part. The grooves (17) are along the length of the stationary contact (4) and open at the front end of the stationary contact (4). The cross section of the grooves (17) is semi-circular. The two moving contacts (10) have hemispherical protrusions (18) on one side of the stationary contact (4) respectively. The protrusions (18) are opposite to the grooves (17) on both sides of the stationary contact (4). The protrusions (18) of the moving contacts (10) are embedded in the grooves (17) of the stationary contact (4). The protrusions (18) of the moving contacts (10) and the grooves (17) of the stationary contact (4) are in sliding fit.
4. The anti-lock grounding switch of the high-voltage switchgear according to claim 1, characterized in that: The two moving contacts (10) have protruding push blocks (19) on opposite sides of their upper parts. The upper end of the push block (19) is an inclined surface. The lower end of the push rod (12) inserted on the top surface of the moving contact frame (9) has a top block (20). The lower end of the top block (20) is triangular. The lower triangle of the top block (20) matches and is opposite to the inclined surface of the push block (19) on the inner side of the two moving contacts (10).
5. The anti-lock grounding switch of the high-voltage switchgear according to claim 1, characterized in that: The handle (13) at the upper end of the push rod (12) is an insulator.