Grounding switch

Abstract

The invention relates to the field of grounding devices, in particular to a grounding switch. The grounding switch is used for solving the problem that a grounding switch moving contact assembly in the prior art is heavy and affects the closing speed of the grounding switch. The grounding switch comprises a static contact assembly, a moving contact assembly and a transmission assembly, the static contact assembly comprises a first static contact, a second static contact and a third static contact which are electrically connected with a three-phase main loop respectively, the moving contact assembly comprises a first moving contact and a second moving contact, the two moving contacts are each provided with two conductive contact parts, and after closing, the transmission assembly is connected with the first moving contact and the second moving contact. The two conductive contact parts of the first moving contact are in conductive contact with the first static contact and the second static contact respectively, and the two conductive contact parts of the second moving contact are in conductive contact with the second static contact and the third static contact respectively. The two moving contacts respectively provided with the two conductive contact parts are contacted with the three-phase static contacts, so that the weight of the moving contact assembly is reduced, the load of the transmission assembly is also reduced, and the closing speed of the moving contacts and the static contacts can be effectively improved.

Description

Technical Field

[0001] The invention relates to the field of grounding devices, and in particular to a grounding switch. Background Art

[0002] Switchgear plays a key role in the power system. With the rapid development of the intelligent distribution network, switchgear is developing towards intelligence, environmental protection and miniaturization. As an important component of switchgear, grounding switch plays an important role in protecting the personal safety of switchgear and operators. Therefore, higher requirements are put forward for the rationality of the structure and reliability of the performance of grounding switch.

[0003] The Chinese utility model patent with the authorization announcement number CN209015971U discloses a direct-acting electric grounding switch, including a chassis, a main shaft, a three-phase moving contact, a three-phase static contact, a swing arm, a driving motor and a sliding shaft moving mechanism. The main shaft is provided with a swing arm, and the driving motor drives the main shaft to rotate when it is started, and the main shaft drives the swing arm to rotate. The swing arm is provided with a longitudinal groove, and the lower end of the three-phase moving contact is fixedly connected to the sliding shaft moving mechanism (which can be regarded as a slider). The sliding shaft moving mechanism is provided with a push rod, and the push rod can cooperate with the longitudinal groove on the swing arm to push the push rod when the swing arm rotates to make the sliding shaft moving mechanism move linearly, and finally realize the opening and closing of the moving contact and the static contact. Among them, the position and number of the three-phase moving contact and the three-phase moving and static contacts correspond one to one. The three-phase moving contact is usually made of copper or alloy material, which is heavy and affects the closing speed of the grounding switch. Summary of the invention

[0004] The object of the present invention is to provide a grounding switch to solve the problem in the prior art that the moving contact assembly of the grounding switch is heavy and affects the closing speed of the grounding switch.

[0005] In order to solve the above technical problems, a grounding switch of the present invention includes a static contact assembly, a moving contact assembly and a transmission assembly. The static contact assembly includes a first static contact, a second static contact and a third static contact which are electrically connected to the three-phase main circuit respectively. The moving contact assembly includes a first moving contact and a second moving contact. Both moving contacts have two conductive contact parts. After the transmission assembly drives the moving contact to close, the two conductive contact parts of the first moving contact are in conductive contact with the first static contact and the second static contact respectively, and the two conductive contact parts of the second moving contact are in conductive contact with the second static contact and the third static contact respectively.

[0006] The present invention proposes a new technical solution to the problem that the moving contact assembly of the grounding switch in the prior art is heavy and affects the closing speed of the grounding switch. Two moving contacts each having two conductive contact parts are used to contact the three-phase static contacts. The two conductive contact parts of the first moving contact are in conductive contact with the first static contact and the second static contact respectively, and the two conductive contact parts of the second moving contact are in conductive contact with the second static contact and the third static contact respectively. When the switch is closed, the three-phase static contacts are reliably grounded. At the same time, such a moving contact assembly is light in weight, which reduces the load of the transmission assembly and can effectively improve the closing speed of the moving contact and the static contact.

[0007] Furthermore, the first static contact, the second static contact and the third static contact are arranged in a straight line at intervals, the first moving contact corresponds to the position between the first and second static contacts, the second moving contact corresponds to the position between the second and third static contacts, and the moving contact enters and exits between the corresponding two adjacent static contacts when opening and closing the circuit.

[0008] Furthermore, the two conductive contact parts of the moving contact are independently arranged, and an elastic member is arranged between the two to provide a tightening force when the two conductive contact parts are in contact with the stationary contact.

[0009] Furthermore, the conductive contact portion is an L-shaped contact having a cross-sectional shape including a vertical side and a horizontal side. The two L-shaped contacts are arranged back to back, and the vertical sides are parallel and juxtaposed, and the horizontal sides extend in opposite directions so that the moving contact is T-shaped as a whole, and the elastic member is arranged between the two vertical sides of the L-shaped contact arranged back to back.

[0010] Furthermore, the contact point between the conductive contact portion and the static contact is an arc surface.

[0011] Furthermore, the static contact comprises a static main contact and a static contact pressure grading cover fixedly connected to the front of the static main contact, and when the moving contact is in the closing position, it contacts the static contact pressure grading cover to achieve closing of the moving contact and the static contact.

[0012] Furthermore, the static contact pressure equalizing cover is divided into left and right halves, and the left and right halves are symmetrically installed at the front end of the static main contact.

[0013] Furthermore, the moving contact assembly includes a moving main contact, and an insertion hole is provided on the moving main contact on the side facing the static contact assembly. The vertical edges of the two L-shaped contacts are inserted into the insertion hole and are connected by a connecting pin that radially passes through the L-shaped contact and the moving main contact at the same time.

[0014] Furthermore, the moving contact assembly further comprises a moving contact pressure equalizing cover which covers the vertical edge of the L-shaped contact and the connection position between the L-shaped contact and the moving main contact.

[0015] Furthermore, both ends of the connecting pin pass through the moving contact pressure equalizing cover respectively, and a stopper is installed at the end of the connecting pin to fix the moving contact pressure equalizing cover.

[0016] Furthermore, a balancing pin is radially installed on the vertical edge of the L-shaped contact, and both ends of the balancing pin pass through the moving contact pressure equalizing cover respectively, and a stopper is installed at the end of the balancing pin to achieve relative fixation of the L-shaped contact and the moving contact pressure equalizing cover.

[0017] Furthermore, the stopping member is a C-shaped retaining ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a grounding switch of the present invention when it is in an open state;

[0019] Figure 2 It is a structural schematic diagram of a grounding switch of the present invention when it is in a closed state;

[0020] Figure 3 It is a structural schematic diagram of a moving contact, a moving main contact and a moving contact voltage grading cover of a grounding switch of the present invention;

[0021] Figure 4 for Figure 3 Top view of the moving contact.

[0022] In the figure: 1. static contact; 101. first static contact; 102. second static contact; 103. third static contact; 2. static contact equalizing cover; 3. moving contact; 301. first moving contact; 302. second moving contact; 4. compression spring; 5. moving contact equalizing cover; 6. bearing; 7. support guide block; 8. rotating main shaft; 9. connecting copper plate; 10. tension spring; 11. grounding switch bracket; 12. slider; 13. swing arm; 14. moving main contact; 15. conductive contact part; 16. connecting pin; 17. balance pin. DETAILED DESCRIPTION

[0023] The Chinese utility model patent with the authorization announcement number CN209015971U discloses a direct-acting electric grounding switch, which has a one-to-one correspondence between a three-phase static contact and a three-phase moving contact, the lower end of the three-phase moving contact is fixedly connected to a sliding shaft moving mechanism, a push rod is vertically arranged on the sliding shaft moving mechanism, and the grounding switch also includes a driving device and a transmission assembly, the transmission assembly includes a main shaft, a swing arm is arranged on the main shaft, and a longitudinal groove is arranged on the swing arm, which can cooperate with the push rod on the sliding shaft moving mechanism to push the push rod when the swing arm rotates to make the sliding shaft moving mechanism move linearly, thereby driving the moving contact to move linearly, and finally realizing the opening and closing of the moving contact and the static contact. Among them, the positions and quantities of the three-phase static contacts and the three-phase moving contacts correspond one-to-one, and the three-phase moving contacts are usually made of copper or alloy material, which is heavy and affects the closing speed of the grounding switch.

[0024] The present invention proposes a brand-new technical solution to the problems existing in the above-mentioned technical solutions. The core concept of the present invention is: using two moving contacts each having two conductive contact parts to contact the three-phase static contacts, the two conductive contact parts of the first moving contact are respectively in conductive contact with the first static contact and the second static contact, the two conductive contact parts of the second moving contact are respectively in conductive contact with the second static contact and the third static contact, the three-phase static contacts can be reliably grounded when the circuit is closed, and at the same time, such a moving contact assembly is light in weight, which reduces the load of the transmission assembly and can effectively improve the closing speed of the moving contact and the static contact.

[0025] Based on the above invention concept, a grounding switch of this embodiment includes a static contact assembly, a moving contact assembly and a transmission assembly, wherein the static contact assembly includes the following components which are electrically connected to the three-phase main circuit: Figure 1 The first stationary contact 101, the second stationary contact 102 and the third stationary contact 103 are shown in FIG. 1 , and the moving contact assembly includes a first moving contact 301 and a second moving contact 302. Both moving contacts 3 have the following Figure 3 The two conductive contact parts 15 shown, when closing, the two conductive contact parts 15 of the first moving contact 301 are in conductive contact with the first static contact 101 and the second static contact 102 respectively, and the two conductive contact parts 15 of the second moving contact 302 are in conductive contact with the second static contact 102 and the third static contact 103 respectively. Using two moving contacts 3 with two conductive contact parts 15 to contact the three-phase static contacts reduces the number of moving contacts, reduces the weight of the moving contact assembly, and also reduces the load of the transmission assembly, which can effectively improve the closing speed of the moving and static contacts.

[0026] In this embodiment, the first static contact 101, the second static contact 102 and the third static contact 103 are arranged in a straight line at intervals, the first moving contact 301 corresponds to the position between the first and second static contacts, the second moving contact 302 corresponds to the position between the second and third static contacts, and the moving contact 3 enters and exits between the corresponding two adjacent static contacts 1 when opening and closing. The moving contact 3 of this embodiment moves linearly under the push of the transmission component, so that when the moving contact 3 moves linearly into the space between the two adjacent static contacts, the two conductive contact parts 15 can contact the side surfaces of the adjacent static contacts respectively. In this way, the movement trajectory of the moving contact 3 is simplified, so that the opening and closing between the moving contact 3 and the static contact 1 is simple and efficient. In addition, in other embodiments, the moving contact can also move under the push of the transmission component until the moving contact reaches the relative front side of the static contact, at which time, the two conductive contact parts contact the front side end surface of the static contact to complete the opening and closing of the grounding switch. Of course, in other embodiments, the moving contact can also swing under the action of the transmission assembly to realize the opening and closing of the grounding switch. The moving contact is located at a position corresponding to between two adjacent static contacts. When swinging to the closed position, the two conductive contact parts can contact the side or front end faces of the adjacent static contacts to complete the opening and closing of the grounding switch.

[0027] In this embodiment, the two conductive contact parts 15 of the moving contact 3 are independently provided, and an elastic member 4 is provided between the two to provide a clamping force when the moving contact 3 contacts the stationary contact 1. The two conductive contact parts 15 of the moving contact 3 of this embodiment are connected by a compression spring 4. The presence of the compression spring 4 can ensure that when the two-phase moving contact 3 and the three-phase stationary contact 1 are closed, the compression spring 4 is in a compressed state and provides a clamping force to both sides, thereby improving the reliability of the closing of the moving contact 3 and the stationary contact 1.

[0028] In this embodiment, the conductive contact portion 15 is L-shaped with a cross-sectional shape including a vertical side and a horizontal side. The two L-shaped conductive contact portions 15 are arranged back to back, and the vertical sides are parallel and juxtaposed, and the horizontal sides extend in opposite directions, so that the moving contact is T-shaped as a whole, and the elastic member 4 is arranged between the two vertical sides of the L-shaped contact that are arranged back to back. The moving contact 3 is T-shaped as a whole, which can reduce the weight of the moving contact 3. If a moving contact with the same front and rear ends is used, its volume is large and its weight is also heavy. Therefore, in this embodiment, a T-shaped moving contact 3 is used, which reduces the volume of the moving contact 3, and the weight of the moving contact assembly is also reduced, which is conducive to improving the closing speed of the grounding switch. In addition, in other embodiments, a linear moving contact and a static contact can also be used to close the circuit breaker. The linear moving contact includes two cylindrical conductive contact parts with an arc-shaped contact surface at one end and a step at the other end. It also includes a mounting sleeve with support holes on both sides. The conductive contact part is sleeved in the mounting sleeve. The step at one end is stopped by the support hole, and the arc-shaped contact surface at the other end extends out of the support hole and contacts with the static contact. A compression spring is installed between the two opposite side surfaces of the step. It is sufficient to ensure that the moving contact and the static contact can be reliably closed when they are in contact.

[0029] In this embodiment, the contact point between the conductive contact portion 15 and the static contact 1 is an arc surface. Figure 4 The rectangular parallelepiped shown in the figure has an arc surface at the edge of the upper outer side, and contacts with the static contact through the arc surface, so that the contact between the moving contact 3 and the static contact 1 is smoother and more stable when the moving contact 3 is pushed upward, and the impact of the moving contact on the static contact 1 can be reduced. Of course, the horizontal part of the conductive contact part can also be semi-cylindrical, and the edge of the upper outer side is set as an arc surface. In addition, in other embodiments, an inclined slope can be set on the conductive contact part, as long as the moving contact and the static contact are in stable contact.

[0030] In the present embodiment, the static contact 1 includes a static main contact and a static contact voltage-equalizing cover 2 fixedly connected to the front of the static main contact. When the moving contact 3 is in the closing position, it contacts the static contact voltage-equalizing cover 2 to achieve the closing of the moving contact 3 and the static contact 1. The front and rear end surfaces of the static contact voltage-equalizing cover of the present embodiment are both circular curved surfaces, and the middle part is a cylindrical outer peripheral surface. The static contact voltage-equalizing cover 2 of the present embodiment is made of copper. In other embodiments, the static contact voltage-equalizing cover can also be made of copper alloy. The front and rear ends of the static contact voltage-equalizing cover 2 are circular curved surfaces, which can avoid the phenomenon of tip discharge caused by the small curvature radius and high surface charge density of the static contact electrode surface. Such a setting makes the electric field distribution around the static contact more uniform, shortens the pre-breakdown distance, and reduces the arc ablation of the contact, which is beneficial for the grounding switch to complete the short-circuit closing process. At the same time, during the short-circuit closing process of the grounding switch, the arc surface of the conductive contact portion 15 contacts the circular curved surface at the front end of the static contact voltage-equalizing cover 2, and the circular curved surface is conducive to good contact between the static contact 1 and the moving contact 3, which can improve the smoothness and stability during closing. In addition, in other embodiments, the closing position of the moving contact and the static contact can be moved backward so that the conductive contact portion contacts the cylindrical outer peripheral surface in the middle of the static contact voltage-equalizing cover, and it is only necessary to ensure that the moving contact can be closed with the static contact.

[0031] In this embodiment, the static contact voltage grading cover 2 is divided into left and right halves, and the left and right halves are symmetrically installed in front of the grounding switch static contact 1. The horizontal cross-section of the static contact voltage grading cover 2 of this embodiment is nearly elliptical and is divided into left and right halves. In this way, it is convenient to install and disassemble the static contact voltage grading cover 2, which can save the cost of disassembly and assembly. Of course, the static contact voltage grading cover is also integrally arranged and installed in front of the static contact.

[0032] In this embodiment, the moving contact assembly includes: Figure 3The moving main contact 14 shown has an insertion hole on the side of the moving main contact 14 facing the stationary contact assembly, and the vertical sides of the two L-shaped contacts are inserted into the insertion hole. When the L-shaped contact is inserted into the insertion hole, the pressing force of the compression spring inside the L-shaped contact is used to achieve reliable contact with the moving main contact 14, and the connecting pin 16 that radially passes through the L-shaped contact and the moving main contact 14 at the same time is used to achieve a reliable connection between the two. In this way, it is helpful to prevent the L-shaped contact from loosening at the connection with the moving main contact 14 due to the vibration generated by the movement when closing and opening the switch, thereby ensuring the reliability of the connection between the two. In this embodiment, three evenly arranged compression springs 4 are provided between the vertical sides of the L-shaped contact. When the L-shaped contact is inserted into the insertion hole of the moving main contact 14, the compression spring 4 at the bottom is located at a relative position of the overlapping part of the L-shaped contact and the moving main contact 14, and the axis of the connecting pin 16 coincides with the axis of the compression spring 4, that is, when the connecting pin 16 passes through the L-shaped contact, it also passes through the compression spring 4 at the bottom.

[0033] In this embodiment, the moving contact assembly further includes a moving contact voltage grading cover 5 that covers the vertical edge of the L-shaped contact and the connection position between the L-shaped contact and the moving main contact 14. The moving contact voltage grading cover 5 can cover the junction of the L-shaped contact and the moving main contact and the connection between the two, thereby avoiding the phenomenon of tip discharge caused by sudden changes in the shape of the junction or the connection, making the electric field at the junction and the connection more uniform. At the same time, the moving contact voltage grading cover 5 also has good thermal conductivity and heat dissipation, which helps to dissipate the heat generated by the moving contact 3 and the moving main contact 14 in the working process in time and maintain the normal operating temperature of the equipment.

[0034] In the present embodiment, both ends of the connecting pin 16 pass through the moving contact voltage equalizing cover 5 respectively, and a stopper is installed at the end of the connecting pin 16 to fix the moving contact voltage equalizing cover 5. When both ends of the connecting pin 16 pass through the moving contact voltage equalizing cover 5, sharp spikes will be formed, causing the phenomenon of tip discharge. Therefore, the length of the connecting pin 16 of the present embodiment is only slightly larger than the size of the moving contact voltage equalizing cover 5. At the same time, the moving contact voltage equalizing cover 5 of the present embodiment is made of aluminum, in the shape of a rectangular tube, and its lateral size is smaller than the size of the horizontal sides of the two L-shaped contacts. In this way, the horizontal sides of the L-shaped contacts can be used to diffuse the electric lines outward, offsetting and shielding the electric field distortion at the connecting pins on both sides of the moving contact voltage equalizing cover 5 (which can be regarded as the tip). Both ends of the connecting pin 16 pass through the moving contact voltage equalizing cover and a stopper is installed at the end of the connecting pin 16. In this way, the reliability of the moving contact voltage equalizing cover set is guaranteed.

[0035] In this embodiment, a balancing pin 17 is radially installed on the vertical side of the L-shaped contact, and the two ends of the balancing pin 17 pass through the moving contact equalizing cover 5 respectively, and a stopper is installed at the end of the balancing pin 17 to achieve the relative fixation of the L-shaped contact and the moving contact equalizing cover 5. There are two balancing pins 17 in this embodiment, and their axes coincide with the axes of the compression springs 4, that is, when the balancing pin 17 passes through the L-shaped contact in the radial direction, it also passes through the two compression springs at the upper part between the two L-shaped contacts respectively. In this way, it is ensured that when the L-shaped contact contacts the static contact equalizing cover, the movement trajectory of the L-shaped contact moves in the axial direction of the balancing pin 17 (that is, the axial direction of the compression spring 4), so as to avoid the relative deflection of the L-shaped contact around the bottom.

[0036] In this embodiment, the stopper is a C-shaped retaining ring. The C-shaped retaining ring has a simple structure and is reliably connected to the balancing pin 17 or the connecting pin 16. In addition, in other embodiments, the stopper may also be a split pin, and a stopper hole is radially arranged at the end of the balancing pin or the connecting pin, and the split pin is inserted into the stopper hole to fix the moving contact pressure equalizing cover. Of course, in other embodiments, the stopper may also be a nut, and a bolt is used to radially pass through the L-shaped contact, the moving main contact and the moving contact pressure equalizing cover, and a nut is used at the end of the bolt to fix the moving contact pressure equalizing cover.

[0037] Since the transmission assembly does not involve the improvement of the present invention, the transmission assembly can adopt the transmission assembly published in the Chinese invention patent with the announcement number CN209015971U. Of course, this embodiment also provides a transmission assembly, which includes a grounding switch bracket 11, a support guide block 7, a rotating main shaft 8, a slider 12, a swing arm 13, a tension spring 10, a connecting copper plate 9, a bearing 6, and an insulating pin. The support guide block 7 is located at the front end of the grounding switch bracket 11 and is fixedly connected to the grounding switch bracket 11 by screws, and is arranged parallel to the direction of the rotating main shaft 8. A circular hole is provided on the support guide block 7, and the circular hole is coaxial with the static contact 12 of the grounding switch, which can guide the reciprocating motion of the moving contact 3 of the grounding switch. The moving contact 3 of the grounding switch passes through the circular hole of the support guide block 7 and can slide in the circular hole; the moving main contact 14 is fixedly connected to the slider 12, and vertical guide grooves are provided on both sides of the slider 12. The rotating main shaft 8 is connected to the grounding switch bracket 11 through a bearing 6. Swing arms 13 arranged in pairs are fixed on the rotating main shaft 8, and insulating pins are provided at the end of the swing arms 13. The guide grooves on the slider 12 can cooperate with the insulating pins at the end of the swing arms 13. When the rotating main shaft 8 rotates, the swing arm 13 rotates, and the insulating pins at the end of the swing arm 13 push the slider 12 to move linearly, thereby realizing the linear motion of the moving contact 3 of the grounding switch and finally realizing the closing of the grounding switch. The end of the slider 12 is connected to a connecting copper plate 9, one end of the reset spring 10 is connected to the support guide block 7, and the other end is connected to the connecting copper plate 9. During the opening process, the rotating main shaft 8 rotates clockwise, driving the swing arm on the rotating main shaft to rotate clockwise, and the insulating pin at the end of the swing arm cooperates with the slider 12 to push the slider 12 downward, and the slider 12 drives the moving contact 3 to move downward, and finally Figure 2 As shown, the moving contact 3 and the static contact 1 are disconnected, and the tension spring 10 is stretched and accumulates elastic potential energy; during the closing process, the rotating main shaft 8 rotates counterclockwise, driving the swing arm 13 on the rotating main shaft 8 to rotate counterclockwise, and the insulating pin at the end of the swing arm 13 cooperates with the slider 12 to push the slider 12 upward, and the slider 12 drives the moving contact 3 to also push upward to finally realize the closing of the moving contact 3 and the static contact 1. At this time, the elastic potential energy of the tension spring 10 is released, which improves the closing speed and reduces the closing time. In addition, in other embodiments, the opening and closing of the grounding switch can be realized by cooperating with a gear and a rack. The gear can be installed on the rotating main shaft and the rack can be installed on the lower side of the moving contact. When the rotating main shaft rotates, the gear on the rotating main shaft will drive the rack to move linearly to finally realize the opening and closing of the grounding switch.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A grounding switch, characterized in that: It includes a static contact assembly, a moving contact assembly and a transmission assembly. The static contact assembly includes a first static contact, a second static contact and a third static contact which are electrically connected to the three-phase main circuit respectively. The moving contact assembly includes a first moving contact and a second moving contact. Both moving contacts have two conductive contact parts. After the transmission assembly drives the moving contact to close, the two conductive contact parts of the first moving contact are in conductive contact with the first static contact and the second static contact respectively, and the two conductive contact parts of the second moving contact are in conductive contact with the second static contact and the third static contact respectively.

2. The grounding switch according to claim 1, characterized in that: The first static contact, the second static contact and the third static contact are arranged in a straight line at intervals, the first moving contact corresponds to the position between the first and second static contacts, the second moving contact corresponds to the position between the second and third static contacts, and the moving contact enters and exits between the corresponding two adjacent static contacts when opening and closing the circuit breaker.

3. The grounding switch according to claim 1, characterized in that: The two conductive contact parts of the moving contact are independently arranged, and an elastic member is arranged between the two to provide a tightening force when the two conductive contact parts are in contact with the stationary contact.

4. The grounding switch according to claim 3, characterized in that: The conductive contact portion is an L-shaped contact having a cross-sectional shape including a vertical side and a horizontal side. The two L-shaped contacts are arranged back to back, and the vertical sides are parallel and juxtaposed, while the horizontal sides extend in opposite directions so that the moving contact is T-shaped as a whole. The elastic member is arranged between the two vertical sides of the L-shaped contact arranged back to back.

5. The grounding switch according to any one of claims 1 to 4, characterized in that: The contact point between the conductive contact portion and the stationary contact is an arc surface.

6. The grounding switch according to any one of claims 1 to 4, characterized in that: The static contact comprises a static main contact and a static contact pressure grading cover fixedly connected to the front of the static main contact. When the moving contact is in the closing position, it contacts the static contact pressure grading cover to achieve closing of the moving contact and the static contact.

7. The grounding switch according to claim 6, characterized in that: The static contact pressure equalizing cover is divided into a left half and a right half, and the left half and the right half are symmetrically installed at the front end of the static main contact.

8. The grounding switch according to claim 4, characterized in that: The moving contact assembly includes a moving main contact, and an insertion hole is provided on the moving main contact on the side facing the stationary contact assembly. The vertical edges of the two L-shaped contacts are inserted into the insertion hole and connected by a connecting pin that radially passes through the L-shaped contact and the moving main contact at the same time.

9. The grounding switch according to claim 8, characterized in that: The moving contact assembly also includes a moving contact pressure equalizing cover which covers the vertical edge of the L-shaped contact and the connection position between the L-shaped contact and the moving main contact.

10. The grounding switch according to claim 9, characterized in that: Both ends of the connecting pin pass through the moving contact pressure equalizing cover respectively, and a stopper is installed at the end of the connecting pin to fix the moving contact pressure equalizing cover.

11. The grounding switch according to claim 10, characterized in that: A balancing pin is radially installed on the vertical edge of the L-shaped contact, and both ends of the balancing pin pass through the moving contact pressure equalizing cover respectively, and a stopper is installed at the end of the balancing pin to achieve relative fixation of the L-shaped contact and the moving contact pressure equalizing cover.

12. The grounding switch according to claim 10 or 11, characterized in that: The stopping member is a C-shaped retaining ring.

Images