Rotary moving end device and three-station isolation grounding switch

Abstract

The invention relates to the technical field of gas insulation switch devices, in particular to a rotary moving end device and a three-station isolation grounding switch. The three-station isolation grounding switch comprises a rotary moving end device, the rotary moving end device comprises a support, a moving contact rotationally connected with the support and a transmission shaft in rotation stopping fit with the moving contact, the support is provided with an installation groove used for installing the moving contact, and installation holes are formed in the corresponding positions of the two sides of the installation groove. A mounting hole is formed in the support, a contact finger ring with a hole in the center is fixedly mounted in the mounting hole, a contact finger groove is formed in one side, facing the moving contact, of the contact finger ring, a contact finger is arranged in the contact finger groove, and an elastic piece is connected to the contact finger, so that stable contact of the contact finger, the moving contact and the support can be ensured, and the rotary moving end device can ensure better through-current capability and realize higher female rotation parameters.

Description

Technical Field

[0001] The invention relates to the technical field of gas insulated switchgear, and in particular to a rotary moving end device and a three-position isolating grounding switch. Background Art

[0002] HGIS (Hybrid Gas Insulated Switchgear) is a composite gas insulated switchgear, which is a new type of high-voltage switchgear between GIS (gas insulated metal-enclosed switchgear) and AIS (air insulated open switchgear). Compared with GIS, HGIS omits busbar equipment, and the busbar is exposed, which has the advantages of clear, simple, compact wiring, convenient installation and maintenance, and high operational reliability. The transformation and expansion of power grid transmission and substations have an increasing demand for the use of HGIS switchgear. The three-position switch with isolation and grounding function is an important part of HGIS equipment, and the requirements for its related technical parameters are getting higher and higher. At present, the design of the three-position isolation and grounding switch is mainly divided into linear and rotary types according to the movement mode of the moving contact. The linear three-position isolation and grounding switch has a large friction force when opening and closing, and has high requirements for the output power of the mechanism; while the rotary three-position isolation and grounding switch has a simple structure, the position of the moving contact is visible, the opening and closing state is easy to observe, the friction between the moving and static contacts is small, the movement resistance is small, and the output power requirement of the mechanism is low.

[0003] The Chinese invention patent with the authorization announcement number CN114649161B and the authorization announcement date April 5, 2024 discloses a three-station isolating grounding switch and an isolating static contact. The three-station isolating grounding switch adopts a rotary structure. The three-station isolating grounding switch includes a housing, a moving contact seat extending in the vertical direction is provided in the housing, the lower end of the moving contact seat is rotatably connected with the moving contact, the upper end of the moving contact seat is fixed to the top of the housing, and the housing is also fixed with an isolating static contact and a grounding static contact. By rotating the moving contact, the switching of closing, opening and grounding can be realized. The moving contact and the moving contact seat of the three-station isolating switch adopt surface contact between the moving contact and the moving contact seat for electrical conduction, which cannot guarantee stable flow conduction capacity, has poor flow capacity, and is difficult to achieve the mother-transfer technical parameters of 1600A and 100V, resulting in a reduction in the service life of the product, a significant increase in the maintenance frequency and cost, difficulty in product maintenance, and loss of market competitiveness. Summary of the invention

[0004] The object of the present invention is to provide a rotary movable end device to solve the problem that the existing movable end device cannot meet the requirements of the female rotation parameters of the isolating grounding switch.

[0005] The present invention also aims to provide a three-position isolating grounding switch to solve the above-mentioned problem.

[0006] The rotary moving end device of the present invention adopts the following technical solutions: A rotary moving end device comprises a support, a moving contact rotatably connected to the support and a transmission shaft cooperated with the moving contact to stop rotation, the support is provided with a mounting groove for mounting the moving contact, mounting holes are provided at corresponding positions on both sides of the mounting groove, a finger ring with a central opening is fixedly installed in the mounting hole, a finger groove is provided on the side of the finger ring facing the moving contact, a finger is provided in the finger groove, and an elastic member is connected to the finger to ensure stable contact between the finger, the moving contact and the support.

[0007] Furthermore, the contact finger is provided with a tip portion, and two sides of the tip portion are arc surfaces for conductive connection with the support and the moving contact.

[0008] Furthermore, a connection hole for connecting an elastic member is opened in the center of the contact finger. The elastic member is a compression spring. An "L"-shaped connection section is arranged at one end of the compression spring. The compression spring is plugged into the contact finger through the connection section.

[0009] Furthermore, a circular hole is opened in the contact finger groove along the elastic movement direction of the contact finger, and one end of the compression spring away from the connecting section is inserted into the circular hole to limit the displacement of the spring.

[0010] Furthermore, a retaining ring groove for limiting the axial displacement of the finger ring along the transmission shaft is formed on the inner wall of the mounting hole, and an elastic retaining ring is arranged in the retaining ring groove.

[0011] Furthermore, the outer wall of the finger ring is provided with a radially protruding portion, the mounting hole is provided with a rotation-stopping hole corresponding to the protruding portion, and a limiting plate is provided in the rotation-stopping hole.

[0012] Furthermore, a spline groove is provided at the matching position between the moving contact and the transmission shaft, and a spline section is provided on the transmission shaft to achieve the anti-rotation matching between the moving contact and the transmission shaft.

[0013] Furthermore, the transmission shaft includes a spline section and a cylindrical section, the cylindrical section is located on both sides of the spline section, the diameter of the cylindrical section is smaller than the outer diameter of the spline section, and an annular boss is provided in the middle of the side of the contact ring facing the moving contact, the inner diameter of the boss is smaller than the outer diameter of the spline section and greater than or equal to the diameter of the cylindrical section, so as to achieve axial limitation of the transmission shaft.

[0014] Furthermore, an arc-starting block is provided at one end of the moving contact away from the transmission shaft.

[0015] Beneficial effects: The rotary moving end device of the present invention is an improved invention. The rotary moving end device of the present invention includes a support, a moving contact rotatably connected to the support, and a transmission shaft that cooperates with the moving contact to stop rotation. The support is provided with a mounting groove for mounting the moving contact. The groove-shaped structure can limit the moving contact and prevent the moving contact from swinging or deflecting in a non-working direction. Mounting holes are provided at corresponding positions on both sides of the mounting groove. A finger ring with a central opening is fixedly installed in the mounting hole. A higher female rotation parameter can be achieved by changing the connection structure. A finger groove is provided on the side of the finger ring facing the moving contact. A finger is provided in the finger groove. Good flow can be achieved through the finger. An elastic member is connected to the finger to ensure stable contact between the finger, the moving contact, and the support. The rotary moving end device can ensure better flow capacity and achieve higher female rotation parameters.

[0016] The three-position isolating grounding switch of the present invention adopts the following technical solutions: A three-station isolating and grounding switch comprises a rotary moving end device, the rotary moving end device comprises a support, a moving contact rotatably connected to the support and a transmission shaft cooperated with the moving contact to stop rotation, the support is provided with a mounting groove for mounting the moving contact, mounting holes are provided at corresponding positions on both sides of the mounting groove, a finger ring with a central opening is fixedly installed in the mounting hole, a finger groove is provided on the side of the finger ring facing the moving contact, a finger is provided in the finger groove, and an elastic member is connected to the finger to ensure stable contact between the finger, the moving contact and the support.

[0017] Furthermore, the contact finger is provided with a tip portion, and two sides of the tip portion are arc surfaces for conductive connection with the support and the moving contact.

[0018] Furthermore, a connection hole for connecting an elastic member is opened in the center of the contact finger. The elastic member is a compression spring. An "L"-shaped connection section is arranged at one end of the compression spring. The compression spring is plugged into the contact finger through the connection section.

[0019] Furthermore, a circular hole is opened in the contact finger groove along the elastic movement direction of the contact finger, and one end of the compression spring away from the connecting section is inserted into the circular hole to limit the displacement of the spring.

[0020] Furthermore, a retaining ring groove for limiting the axial displacement of the finger ring along the transmission shaft is formed on the inner wall of the mounting hole, and an elastic retaining ring is arranged in the retaining ring groove.

[0021] Furthermore, the outer wall of the finger ring is provided with a radially protruding portion, the mounting hole is provided with a rotation-stopping hole corresponding to the protruding portion, and a limiting plate is provided in the rotation-stopping hole.

[0022] Furthermore, a spline groove is provided at the matching position between the moving contact and the transmission shaft, and a spline section is provided on the transmission shaft to achieve the anti-rotation matching between the moving contact and the transmission shaft.

[0023] Furthermore, the transmission shaft includes a spline section and a cylindrical section, the cylindrical section is located on both sides of the spline section, the diameter of the cylindrical section is smaller than the outer diameter of the spline section, and an annular boss is provided in the middle of the side of the contact ring facing the moving contact, the inner diameter of the boss is smaller than the outer diameter of the spline section and greater than or equal to the diameter of the cylindrical section, so as to achieve axial limitation of the transmission shaft.

[0024] Furthermore, an arc-starting block is provided at one end of the moving contact away from the transmission shaft.

[0025] Beneficial effects: The three-station isolating grounding switch of the present invention is an improved invention. The three-station isolating grounding switch of the present invention includes a rotary moving end device, which includes a support, a moving contact rotatably connected to the support, and a transmission shaft that cooperates with the moving contact to stop rotation. The support is provided with a mounting groove for mounting the moving contact. The groove-shaped structure can limit the moving contact and prevent the moving contact from swinging or deflecting in a non-working direction. Mounting holes are provided at corresponding positions on both sides of the mounting groove. A finger ring with a central opening is fixedly installed in the mounting hole. A higher female rotation parameter is achieved by changing the connection structure. A finger groove is provided on the side of the finger ring facing the moving contact. A finger is provided in the finger groove. Good flow can be achieved through the finger. An elastic member is connected to the finger to ensure stable contact between the finger, the moving contact, and the support. The rotary moving end device can ensure better flow capacity and achieve higher female rotation parameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the rotary moving end device of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure located at different workstations; Figure 3 for Figure 2 Schematic diagram of the structure of AA; Figure 4 for Figure 1 Schematic diagram of the structure after the support is removed; Figure 5 for Figure 1 Only the structural schematic diagram of the moving contact and the transmission shaft is retained; Figure 6 is a schematic diagram of the structure of the finger ring; Figure 7 This is a schematic diagram of the structure of the finger ring after the finger is removed; Figure 8 for Figure 7 Schematic diagram of the structure with the compression spring removed; Fig. 9 It is a schematic diagram of the assembly of the contact finger and the compression spring; Fig.10 It is a structural schematic diagram of the moving contact; Fig.11It is a schematic diagram of the structure of the transmission shaft; Fig.12 is a schematic diagram of the structure of the touch finger; Fig.13 It is a structural schematic diagram of a compression spring; Fig.14 This is a schematic diagram of the support structure.

[0027] In the figure: 1. support; 2. moving contact; 3. transmission shaft; 4. mounting groove; 5. mounting hole; 6. contact finger ring; 7. contact finger groove; 8. contact finger; 9. compression spring; 10. connecting hole; 11. connecting section; 12. round hole; 13. retaining ring slot; 14. elastic retaining ring; 15. raised part; 16. anti-rotation hole; 17. limit plate; 18. spline groove; 19. spline section; 20. boss; 21. arc-starting block; 22. shielding cover. DETAILED DESCRIPTION

[0028] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0029] The existing rotary movable end device cannot meet the requirements of the female rotation parameter, and the connection structure of the movable end device has a great influence on the female rotation parameter. The idea of ​​the present invention is to enhance its flow capacity by changing the rotary conductive structure of the rotary movable end device to achieve a higher female rotation parameter.

[0030] The specific implementation of the rotary moving end device of the present invention is as follows: Based on the above ideas, Figure 1 , 2 As shown in Figures 3 and 4, in a basic embodiment, the rotary moving end device of the present invention includes a support 1, a moving contact 2 rotatably connected to the support 1, and a transmission shaft 3 that cooperates with the moving contact 2 to stop rotation. The support 1 is provided with a mounting groove 4 for mounting the moving contact 2. The groove structure prevents the moving contact 2 from moving in the axial direction of the transmission shaft 3. The mounting groove 4 adopts a U-shaped groove structure, which can limit the movement trajectory of the moving contact 2 and prevent the moving contact 2 from swinging or deflecting in a non-working direction. Mounting holes 5 are provided at corresponding positions on both sides of the mounting groove 4. A contact finger ring 6 with a central opening is fixedly installed in the mounting hole 5. A higher female rotation parameter is achieved by changing the connection structure. A contact finger groove 7 is provided on the side of the contact finger ring 6 facing the moving contact 2. A contact finger 8 is provided in the contact finger groove 7. Good flow can be achieved through the contact finger 8. An elastic member is connected to the contact finger 8 to ensure stable contact between the contact finger 8 and the moving contact 2 and the support 1. The rotary moving end device can ensure better flow capacity to achieve higher female rotation parameters.

[0031] In a preferred embodiment, the contact finger 8 is provided with a tip portion, and both sides of the tip portion are arc surfaces for conductive connection with the support 1 and the moving contact 2, and the arc surfaces are used for conductive contact with the side surface of the moving contact 2 and the inner wall of the mounting hole 5 on the support 1, thereby ensuring that the contact finger 8 is always conductively contacted with the moving contact 2 and the support 1 through line contact during the rotation of the moving contact 2. Compared with a plane designed as a plane and the plane is conductively contacted with the moving contact 2, the arc surface designed as a surface is subjected to less friction during rotation, and the torque required for the rotation of the moving contact 2 is also reduced, thereby improving the stability of the conductive connection between the moving contact 2 and the support 1.

[0032] In other embodiments, the contact surface between the contact finger 8 and the moving contact 2 and the support 1 is designed to be a plane, which has better flow capacity. Although it will increase the friction force received by the moving contact 2 when it rotates, the torque required for the rotation of the moving contact 2 is greater, which reduces the mechanical reliability of the rotary moving end device, it can still work normally.

[0033] like Fig. 9 , 12 As shown in Figures 13, in a preferred embodiment, a connecting hole 10 for connecting an elastic member is opened at the center of the contact finger 8, and the connecting hole 10 is used to connect with the elastic member. The elastic member is a compression spring 9, and an "L"-shaped connecting section 11 is arranged at one end of the compression spring 9. The compression spring 9 is plugged into the contact finger 8 through the connecting section 11. The "L"-shaped connecting section 11 is used to hook the contact finger 8, so as to constrain the contact finger 8 to move only along the compression and stretching directions of the spring and to rotate around the "L"-shaped connecting section 11.

[0034] In other embodiments, the contact finger 8 and the compression spring 9 are fixed together by gluing, which is not conducive to maintenance and fixation, and the installation is complicated, but it can also achieve similar effects and work normally.

[0035] like Figure 6 , 7 As shown in FIG. 8 , in a preferred embodiment, a circular hole 12 is opened in the finger groove 7 along the elastic movement direction of the finger 8, and the end of the compression spring 9 away from the connecting section 11 is inserted into the circular hole 12 to prevent the compression spring 9 from moving in the finger groove 7, and limit the compression spring 9 to move only in the compression and tension directions. In other embodiments, the end of the compression spring 9 away from the connecting section 11 can be glued and fixed to the bottom of the finger groove 7. Although this may cause the spring to vibrate and deviate during compression, causing the finger 8 to leave the control position, it can also achieve a similar effect and work normally.

[0036] like Fig.14As shown, in a preferred embodiment, a retaining ring groove 13 for limiting the axial displacement of the contact finger ring 6 along the transmission shaft 3 is opened on the inner wall of the mounting hole 5, and an elastic retaining ring 14 is arranged in the retaining ring groove 13. The elastic retaining ring 14 is arranged to limit the axial position of the contact finger ring 6, so as to prevent the contact finger ring 6 from axially moving, thereby avoiding the poor contact between the contact finger 8 and the moving contact 2 and the support 1 due to the displacement of the contact finger ring 6, thereby affecting the normal and stable operation of the power system.

[0037] In other embodiments, a cover is installed on the outer side of the mounting hole 5 on the support 1 to clamp and fix the finger ring 6. Although the installation is complicated and the status cannot be observed, it can still achieve a similar effect and can work normally.

[0038] In a preferred embodiment, the outer wall of the finger ring 6 is provided with a radial protrusion 15, the mounting hole 5 is provided with a stop hole 16 corresponding to the protrusion 15, and a limit plate 17 is provided in the stop hole 16. By providing the protrusion 15 and the corresponding stop hole 16, the finger ring 6 can be prevented from rotating in the mounting hole 5 to affect the flow effect. In other embodiments, the protrusion and the stop hole 16 are not provided, and the finger ring 6 is fixedly installed in the mounting hole 5 by gluing, which can also achieve the anti-rotation function. Although the installation and subsequent maintenance are complicated and not conducive to disassembly and replacement, it can also achieve a similar effect and can work normally.

[0039] like Figure 5 As shown, in a preferred embodiment, a spline groove 18 is provided at the matching position of the moving contact 2 and the transmission shaft 3, and a spline segment 19 is provided on the transmission shaft 3 to achieve the anti-rotation fit between the moving contact 2 and the transmission shaft 3. The moving contact 2 and the transmission shaft 3 are connected by a spline, so that there is no relative rotation between the two, so that the rotation movement of the moving contact 2 is reliable. In other embodiments, the moving contact 2 and the transmission shaft 3 are connected by a key to achieve anti-rotation fit, which can achieve a similar effect. Although the torque required for the rotation of the moving contact 2 will increase, it can also work normally.

[0040] like Fig.10 , 11 As shown, in a preferred embodiment, the transmission shaft 3 includes a spline section 19 and a cylindrical section, the cylindrical section is located on both sides of the spline section 19, the diameter of the cylindrical section is smaller than the outer diameter of the spline section 19, and an annular boss 20 is provided in the middle of the side of the contact ring 6 facing the moving contact 2. The inner diameter of the boss 20 is smaller than the outer diameter of the spline section 19 and greater than or equal to the diameter of the cylindrical section. The end face of the boss 20 close to one end of the moving contact 2 cooperates with one end of the spline section 19, and the axial limitation of the transmission shaft 3 is achieved by clamping and fixing on both sides.

[0041] In other embodiments, the boss 20 is not provided, and sleeves for cooperating with the finger ring 6 are provided at both ends of the spline segment 19, which can also achieve axial limitation of the transmission shaft 3. Although the structure is more complicated and difficult to install on site, it can also work normally.

[0042] In a preferred embodiment, an arc-starting block 21 is provided at one end of the moving contact 2 away from the transmission shaft 3, and the arc-starting function of the arc-starting block 21 reduces the erosion of the main contact. During the busbar switching operation, before the moving contact 2 of the disconnector is separated from the conductive contact fingers 8 of the stationary contact, the main circuit is conductive through the main contact on the moving contact 2; after the moving contact 2 is separated from the stationary contact fingers 8, a large current is concentrated on the contact surface between the arc-starting block 21 of the moving contact 2 and the stationary contact fingers 8. When the arc-starting block 21 of the moving contact 2 is completely separated from the stationary contact fingers 8, an arc begins to be generated. At this time, the arc burns the arc-starting block 21 of the moving contact 2, thereby effectively reducing the erosion of the main contact by the arc and increasing the service life of the moving contact 2 of the disconnector.

[0043] A shielding cover 22 is fixedly installed on the end of the transmission shaft 3 that is not connected to the operating mechanism. The shielding cover 22 can shield the electric field distortion caused by the exposure of the transmission shaft 3; 27 contact finger grooves 7 are evenly distributed on the circumferential surface of one side of the contact finger ring 6, and contact fingers 8 are correspondingly installed in the contact finger grooves 7, which can ensure the stability of the flow conduction capacity of each workstation.

[0044] During the installation process, first install the moving contact 2 into the mounting groove of the support 1, then pass the transmission shaft 3 through the mounting hole 5, make the spline segment 19 and the spline groove 18 cooperate to install, then install the contact finger ring 6 with the contact finger structure installed into the mounting hole 5, position the contact finger ring 6 through the limit plate 17 in the stop hole 16, insert the protrusion 15 into the corresponding stop hole 16, use the tool to install the elastic retaining ring 14 into the retaining ring slot 13, install the shielding cover 22 on the corresponding shaft end, and complete the assembly of the rotary moving end device.

[0045] When in working state, the operating mechanism transmits torque to the transmission shaft 3. The rotation of the transmission shaft 3 drives the moving contact 2 to rotate through the spline connection. The conversion of the three different working positions of closing, opening and grounding is realized by rotating the moving contact 2 at different angles and the position relationship with the static contact and the grounding static contact. During the process of the moving and static contacts contacting and conducting, the working process of the arc striking block 21 is as described above and will not be repeated.

[0046] The specific implementation of the three-position isolating grounding switch of the present invention is as follows: In a basic embodiment, the three-position isolating and grounding switch of the present invention includes a rotary movable end device, and the specific implementation of the rotary movable end device is as described above and will not be repeated.

[0047] 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 rotary moving end device, comprising a support, a moving contact rotatably connected to the support, and a transmission shaft engaged with the moving contact, characterized in that: The support is provided with an installation groove for installing the moving contact, and installation holes are provided at corresponding positions on both sides of the installation groove. A contact finger ring with a central opening is fixedly installed in the installation hole, and a contact finger groove is provided on the side of the contact finger ring facing the moving contact. A contact finger is provided in the contact finger groove, and an elastic member is connected to the contact finger to ensure stable contact between the contact finger, the moving contact and the support.

2. The rotary moving end device according to claim 1, characterized in that: The contact finger is provided with a tip portion, and both sides of the tip portion are arc surfaces for conducting connection with the support and the moving contact.

3. The rotary moving end device according to claim 1 or 2, characterized in that: A connection hole for connecting an elastic member is provided at the center of the contact finger. The elastic member is a compression spring. An "L"-shaped connection section is arranged at one end of the compression spring. The compression spring is plugged into the contact finger through the connection section.

4. The rotary moving end device according to claim 3, characterized in that: A circular hole is opened in the contact finger groove along the elastic movement direction of the contact finger, and one end of the compression spring away from the connecting section is inserted into the circular hole to limit the radial displacement of the spring.

5. The rotary moving end device according to claim 1, 2 or 4, characterized in that: A retaining ring groove for limiting the axial displacement of the finger ring along the transmission shaft is formed on the inner wall of the mounting hole, and an elastic retaining ring is arranged in the retaining ring groove.

6. The rotary moving end device according to claim 1, 2 or 4, characterized in that: The outer wall of the finger ring is provided with a radially protruding portion, the mounting hole is provided with a rotation-stopping hole corresponding to the protruding portion, and a limiting plate is provided in the rotation-stopping hole.

7. The rotary moving end device according to claim 1, 2 or 4, characterized in that: A spline groove is provided at the matching position between the moving contact and the transmission shaft, and a spline section is provided on the transmission shaft to achieve the anti-rotation matching between the moving contact and the transmission shaft.

8. The rotary moving end device according to claim 7, characterized in that: The transmission shaft includes a spline section and a cylindrical section. The cylindrical section is located on both sides of the spline section. The diameter of the cylindrical section is smaller than the outer diameter of the spline section. An annular boss is provided in the middle of the side of the contact ring facing the moving contact. The inner diameter of the boss is smaller than the outer diameter of the spline section and greater than or equal to the diameter of the cylindrical section to achieve axial limitation of the transmission shaft.

9. The rotary moving end device according to claim 1, 2, 4 or 8, characterized in that: An arc-starting block is arranged at one end of the moving contact away from the transmission shaft.

10. A three-position isolating grounding switch, comprising a moving end device, characterized in that: The movable end device is a rotary movable end device as described in any one of claims 1-9.

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