A three-position isolating switch and high-voltage AC vacuum ring network cabinet

Abstract

The present invention provides a three-position disconnector and a high-voltage AC vacuum ring network cabinet, comprising: a contact knife, which can be installed on the switch body in a linear manner up and down; a main shaft, which drives the contact knife to move through a gear rack assembly; a closing static contact, an intermediate static contact and a grounding static contact, which are arranged on the switch body from top to bottom in sequence, and each has a slot for inserting the contact knife, and a straight conductive spring is installed on the inner wall of the slot, and the length extension direction of the straight conductive spring is arranged parallel to the contact knife surface on the side of the contact knife, wherein, when the contact knife is inserted into the slot, the side of the straight conductive spring is squeezed by the contact knife surface and is in close contact with it. In addition to providing contact pressure, the straight conductive spring is also used for conductive connection between the static contact and the moving contact. When the current increases, the length of the straight conductive spring only needs to be slightly increased to increase the contact area between the static contact and the contact knife, and the contact pressure increased in this way is small, making the contact process of opening and closing more labor-saving.

Description

Technical Field

[0001] The invention relates to the technical field of switch cabinets, and in particular to a three-position isolating switch and a high-voltage AC vacuum ring network cabinet. Background Art

[0002] The existing three-position isolating switch includes a blade, an isolating static contact and a grounding static contact. The blade is arranged on a main shaft and driven by the main shaft to rotate, thereby contacting or disconnecting with the isolating static contact and the grounding static contact respectively. Since the blade is rotated, the width of the cabinet is relatively large, which increases the cost of the cabinet. In addition, Chinese patent document CN108511212A discloses a high-voltage switch contact blade assembly and a high-voltage switch, such as Figure 8 As shown, it includes a stationary contact 01 and a contact blade assembly, the contact blade assembly includes two blades 02 arranged opposite to each other, an insertion space for inserting the stationary contact 01 is formed between the two blades 02, the two blades 02 are penetrated by a support rod 03, and both ends of the support rod 03 are respectively installed on the outer sides of the two blades 02 with springs 04 that provide a force for the two blades 02 to approach each other. Since the three-phase contacts A, B, and C need to maintain a suitable phase-to-phase distance to ensure electrical insulation performance, the existence of the support rod 03 makes the entire switch larger in size, increasing the production cost. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of large size of the large current isolating switch in the prior art, thereby providing a three-position isolating switch and a high-voltage AC vacuum ring network cabinet.

[0004] To this end, the present invention provides a three-position isolating switch, comprising a contact knife, a main shaft, a closing static contact, an intermediate static contact, and a grounding static contact, wherein the contact knife is installed on a switch body so as to be movable linearly up and down; the main shaft is rotatably installed on the switch body, and drives the contact knife to move through a gear rack assembly; the closing static contact, the intermediate static contact, and the grounding static contact are sequentially arranged on the switch body from top to bottom, and each has a slot for inserting the contact knife, and a straight conductive spring is installed on the inner wall of the slot, and the length extension direction of the straight conductive spring is arranged parallel to the contact knife surface on the side of the contact knife, wherein when the contact knife is inserted into the slot, the side surface of the straight conductive spring is squeezed by the contact knife surface and is in close contact with it.

[0005] The cross-section of the straight conductive spring is elliptical, and an installation groove for installing the straight conductive spring is provided on the inner wall of the slot, and the installation groove has a first contact surface arranged parallel to the moving direction of the touch knife, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to the first contact surface, wherein when one side surface of the elliptical straight conductive spring is squeezed by the touch knife, the other side surface thereof is in contact with the first contact surface, the second contact surface and the third contact surface respectively.

[0006] The closing static contact, the middle static contact and the grounding static contact all have two groups of the straight conductive springs located on both sides of the slot, and each group includes a plurality of the straight conductive springs spaced apart and distributed along the moving direction of the contact blade.

[0007] The rack and pinion assembly includes a rack and a transmission gear assembly, wherein the rack is arranged on the side of the touch knife and extends along the height direction of the touch knife; the transmission gear assembly is arranged between the main shaft and the rack, and the transmission gear assembly is suitable for converting the rotation of the main shaft into a force that drives the rack to move up and down.

[0008] The transmission gear assembly includes a main gear, a driven gear and an intermediate gear. The main gear is fixed on the main shaft and rotates in conjunction with the main shaft; the driven gear is meshed and connected with the rack; the intermediate gear is coaxially arranged with the driven gear, the intermediate gear is meshed and connected with the main gear, and the main gear drives the driven gear to rotate through the intermediate gear.

[0009] A vertically arranged guide sleeve is arranged in the switch body. The guide sleeve is formed with a slide groove for the contact knife to move up and down, and an opening located in the middle thereof for the middle static contact to extend into.

[0010] Two parallel supporting arms are arranged on the outer wall of the guide sleeve, a rotating shaft is arranged between the two supporting arms, and the driven gear and the intermediate gear are sleeved on the rotating shaft.

[0011] The present invention also provides a high-voltage AC vacuum ring network cabinet, comprising a sealed pole and the three-position isolating switch as described above.

[0012] The sealed pole comprises an epoxy resin cover and a vacuum interrupter arranged in the epoxy resin cover. The middle static contact is arranged on the top of the vacuum interrupter. The middle static contact and the vacuum interrupter are integrally cast to form the epoxy resin cover.

[0013] An insulating pull rod is provided below the moving end of the vacuum interrupter, and the moving conductive end of the vacuum interrupter is connected to the insulating pull rod through a flexible connection with an outgoing busbar. The insulating pull rod, the flexible connection and the outgoing busbar are all located inside the epoxy resin cover.

[0014] The technical solution of the present invention has the following advantages:

[0015] 1. The three-position disconnector provided by the present invention comprises a contact blade, a main shaft, a closing static contact, an intermediate static contact and a grounding static contact, wherein the three static contacts all have a slot for the contact blade to be inserted, and at least one straight conductive spring is installed on the inner wall of the slot, and the length extension direction of the straight conductive spring is arranged parallel to the contact blade surface on the side of the contact blade, wherein when the contact blade is inserted into the slot, the side surface of the straight conductive spring is squeezed by the contact blade surface and is in close contact with it. In addition to providing contact pressure, the straight conductive spring is also used for the conductive connection between the static contact and the moving contact. When the current increases, the contact area between the static contact and the contact blade can be increased by only increasing the length of the straight conductive spring a little, and the contact pressure increased in this way is small, making the contact process of opening and closing the switch more labor-saving; in addition, since the setting direction of the straight conductive spring of the present application is parallel to the contact blade surface on the side of the contact blade, the increase in the length of the straight conductive spring will not increase the width of each phase contact. While ensuring the electrical gap between the two adjacent phase contacts, compared with the prior art, the size of the switch body is smaller, reducing the cost; in addition, when the main shaft drives the contact blade to move up and down through the gear rack assembly, the opening and closing of the isolating switch and the earthing switch can be realized. Since the contact blade adopts a linear reciprocating movement, compared with the prior art method of realizing opening and closing by rotating the contact blade, this occupies less space, further reducing the cost of the switch body.

[0016] 2. In the three-position isolating switch provided by the present invention, the cross-section of the straight conductive spring is elliptical, and an installation groove for installing the straight conductive spring is provided on the inner wall of the slot, the installation groove has a first contact surface arranged parallel to the moving direction of the touch knife, and a second contact surface and a third contact surface arranged on the upper and lower sides of the first contact surface and inclined to the first contact surface, wherein when one side surface of the elliptical straight conductive spring is squeezed by the touch knife, the other side surface thereof is in contact with the first contact surface, the second contact surface and the third contact surface respectively, so that the contact points between the straight conductive spring and the touch knife are increased by at least twice, thereby reducing the contact resistance, increasing the conductivity, and reducing the temperature rise, and the three-point contact makes the positioning of the straight conductive spring more accurate, thereby ensuring the connection reliability.

[0017] 3. The vacuum ring main unit provided by the present invention has a sealed pole including a vacuum arc extinguishing chamber arranged in an epoxy resin cover, an intermediate static contact is provided on the top of the vacuum arc extinguishing chamber, and the intermediate static contact and the vacuum arc extinguishing chamber are integrally cast to form an epoxy resin cover, thereby forming an integral core component, which fundamentally guarantees the quality of subsequent products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a three-dimensional diagram of the ring main unit of the present invention;

[0020] Figure 2 It is a schematic diagram of the assembly of the stationary contact, the straight conductive spring and the contact blade;

[0021] Figure 3 It is a schematic diagram of the explosion structure of the static contact and the straight conductive spring;

[0022] Figure 4 It is a schematic diagram of the assembly of the main shaft, the gear rack assembly, the guide sleeve and the sealed pole;

[0023] Figure 5 A disassembled schematic diagram of the assembly schematic diagram of the main shaft, the gear rack assembly, the guide sleeve and the sealed pole;

[0024] Figure 6 It is a schematic diagram of the explosion structure of the sealed pole;

[0025] Figure 7 It is a schematic diagram of the exploded structure of the contact blade, the gear rack assembly and the intermediate static contact;

[0026] Figure 8 It is a schematic diagram of the structure of a stationary contact and a contact blade assembly in the prior art.

[0027] Description of reference numerals: 01, static contact; 02, blade; 03, support rod; 04, spring;

[0028] 1. Contact knife; 2. Switch body; 3. Main shaft; 4. Gear rack assembly; 5. Closing static contact; 6. Intermediate static contact; 7. Grounding static contact; 8. Slot; 9. Straight conductive spring; 10. Mounting slot; 11. First contact surface; 12. Second contact surface; 13. Third contact surface; 14. Rack; 15. Main gear; 16. Driven gear; 17. Intermediate gear; 18. Guide sleeve; 19. Slide groove; 20. Opening; 21. Support arm; 22. Sealed pole; 24. Vacuum interrupter; 25. Insulating pull rod; 26. Flexible connection; 27. Outgoing busbar; 43. Epoxy resin cover; 110. Contact knife surface. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0033] Example 1

[0034] This embodiment provides a three-position isolating switch, such as Figure 1 and Figure 5 As shown, it includes a contact blade 1, a main shaft 3, a closing static contact 5, an intermediate static contact 6 and a grounding static contact 7.

[0035] The contact knife 1 is installed on the switch body 2 so as to be movable up and down. Since the contact knife 1 adopts a linear reciprocating motion, compared with the prior art method of realizing opening and closing by rotating the contact knife 1, it occupies less space and reduces the cost of the switch body 2.

[0036] The main shaft 3 is rotatably mounted on the switch body 2 and drives the contact knife 1 to move through the gear rack assembly 4. Figure 4 and Figure 5 As shown, the rack and gear assembly 4 includes: a rack 14, which is arranged on the side of the touch knife 1 and extends along the height direction of the touch knife 1; a transmission gear assembly, which is arranged between the main shaft 3 and the rack 14, and the transmission gear assembly is suitable for converting the rotation of the main shaft 3 into a force to drive the rack 14 to move up and down, and the transmission gear assembly includes: a main gear 15, which is fixed on the main shaft 3 and rotates in conjunction with the main shaft 3; a driven gear 16, which is meshed and connected with the rack 14; an intermediate gear 17, which is coaxially arranged with the driven gear 16, and the intermediate gear 17 is meshed and connected with the main gear 15, and the main gear 15 drives the driven gear 16 to rotate through the intermediate gear 17. The diameter of the main gear 15 is larger than the diameter of the driven gear 16, and the diameter of the driven gear 16 is larger than the diameter of the intermediate gear 17. Since the spring operating mechanism drives the main shaft 3 to rotate very quickly when opening and closing the switch, the speed change transmission is realized through the large gear, small gear and middle gear, which is more compatible with the spring operating mechanism.

[0037] like Figure 5 As shown, a guide sleeve 18 arranged vertically is fixedly disposed on the outer wall of the sealed pole 22 of the switch body 2. Figure 7 As shown, the guide sleeve 18 is formed with a slide groove 19 for the contact knife 1 to move up and down, and an opening 20 located in the middle for the intermediate static contact 6 to extend into. Two parallel support arms 21 are provided on the outer wall of the guide sleeve 18, and a rotating shaft is provided between the two support arms 21. The driven gear 16 and the intermediate gear 17 are sleeved on the rotating shaft.

[0038] The closing static contact 5, the middle static contact 6 and the grounding static contact 7 are sequentially arranged on the switch body 2 from top to bottom. Figure 2 and Figure 3 As shown, the three stationary contacts all have a slot 8 for the stylus 1 to be inserted into, and a straight conductive spring 9 is installed on the inner wall of the slot 8. The length extension direction of the straight conductive spring 9 is arranged parallel to the stylus surface 110 on the side of the stylus 1. When the stylus 1 is inserted into the slot 8, the side of the straight conductive spring 9 is pressed by the stylus surface 110 and is in close contact with it. In this embodiment, Figure 2As shown, the cross section of the straight conductive spring 9 is elliptical, and the inner wall of the slot 8 is provided with a mounting groove 10 for mounting the straight conductive spring 9, and the mounting groove 10 has a first contact surface 11 arranged parallel to the moving direction of the contact blade 1, and a second contact surface 12 and a third contact surface 13 arranged on the upper and lower sides of the first contact surface 11 and inclined thereto, wherein when one side of the elliptical straight conductive spring 9 is squeezed by the contact blade 1, the other side thereof is respectively in contact with the first contact surface 11, the second contact surface 12 and the third contact surface 13, so that the contact points between the straight conductive spring 9 and the contact blade 1 are increased by at least one time, thereby reducing the contact resistance, increasing the conductivity, and reducing the temperature rise, and the three-point contact makes the position positioning of the straight conductive spring more accurate, ensuring the connection reliability. The closing static contact 5, the intermediate static contact 6 and the grounding static contact 7 all have two groups of the straight conductive springs 9 located on both sides of the slot 8, and each group includes a plurality of the straight conductive springs 9 spaced apart along the moving direction of the contact blade 1.

[0039] Example 2

[0040] This embodiment also provides a high-voltage AC vacuum ring main unit, including a sealed pole 22 and a three-position isolating switch as described in Embodiment 1.

[0041] The sealed pole 22, such as Figure 6 As shown, it includes an epoxy resin cover 43, and a vacuum interrupter 24 arranged in the epoxy resin cover 43, the top of the vacuum interrupter 24 is provided with the intermediate static contact 6, and the intermediate static contact 6 and the vacuum interrupter 24 are integrally cast to form the epoxy resin cover 43. An insulating pull rod 25 is provided below the moving end of the vacuum interrupter 24, and the moving conductive end of the vacuum interrupter 24 and the insulating pull rod 25 are connected to the outgoing busbar 27 through a flexible connection 26, and the insulating pull rod 25, the flexible connection 26 and the outgoing busbar 27 are all located inside the epoxy resin cover 43.

[0042] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A three-position isolating switch, characterized in that: include: The contact blade (1) is mounted on the switch body (2) so as to be movable in a straight line up and down; A main shaft (3) is rotatably mounted on the switch body (2) and drives the contact knife (1) to move via a gear rack assembly (4); The closing static contact (5), the intermediate static contact (6) and the grounding static contact (7) are arranged on the switch body (2) in sequence from top to bottom, and each has a slot (8) for the contact blade (1) to be inserted, and a straight conductive spring (9) is installed on the inner wall of the slot (8), and the length extension direction of the straight conductive spring (9) is arranged parallel to the contact blade surface (110) on the side of the contact blade (1), wherein when the contact blade (1) is inserted into the slot (8), the side surface of the straight conductive spring (9) is pressed by the contact blade surface (110) and is in close contact with it; The rack and gear assembly (4) comprises: a rack (14) provided on a side surface of the touch knife (1) and extending in a height direction of the touch knife (1); a transmission gear assembly provided between the main shaft (3) and the rack (14), the transmission gear assembly being suitable for converting the rotation of the main shaft (3) into a force driving the rack (14) to move up and down, the transmission gear assembly comprising: a main gear (15) fixed on the main shaft (3) and rotating in conjunction with the main shaft (3); a driven gear (16) meshingly connected with the rack (14); an intermediate gear (17) coaxially arranged with the driven gear (16), the intermediate gear (17) meshingly connected with the main gear (15), the main gear (15) driving the driven gear (16) to rotate via the intermediate gear (17); The switch body (2) is provided with a guide sleeve (18) arranged vertically, wherein the guide sleeve (18) is formed with a slide groove (19) for the contact blade (1) to move up and down, and an opening (20) located in the middle thereof for the middle stationary contact (6) to extend into.

2. The three-position isolating switch according to claim 1, characterized in that: The cross section of the straight conductive spring (9) is elliptical. The inner wall of the slot (8) is provided with a mounting groove (10) for mounting the straight conductive spring (9). The mounting groove (10) has a first contact surface (11) arranged parallel to the moving direction of the touch knife (1), and a second contact surface (12) and a third contact surface (13) arranged on the upper and lower sides of the first contact surface (11) and inclined thereto. When one side surface of the elliptical straight conductive spring (9) is squeezed by the touch knife (1), the other side surface thereof is in contact with the first contact surface (11), the second contact surface (12) and the third contact surface (13), respectively.

3. The three-position disconnector according to claim 1 or 2, characterized in that: The closing static contact (5), the intermediate static contact (6) and the grounding static contact (7) each have two groups of the straight conductive springs (9) located on both sides of the slot (8), and each group includes a plurality of the straight conductive springs (9) distributed at intervals along the moving direction of the contact blade (1).

4. The three-position isolating switch according to claim 1, characterized in that: Two parallel supporting arms (21) are provided on the outer wall of the guide sleeve (18), a rotating shaft is provided between the two supporting arms (21), and the driven gear (16) and the intermediate gear (17) are sleeved on the rotating shaft.

5. A high voltage AC vacuum ring main unit, characterized in that: It comprises a sealed pole (22) and a three-position disconnector as claimed in any one of claims 1 to 4.

6. The high-voltage AC vacuum ring main unit according to claim 5, characterized in that: The sealed pole (22) comprises an epoxy resin cover (43) and a vacuum interrupter (24) arranged in the epoxy resin cover (43); the middle stationary contact (6) is arranged on the top of the vacuum interrupter (24); the middle stationary contact (6) and the vacuum interrupter (24) are integrally cast to form the epoxy resin cover (43).

7. The high-voltage AC vacuum ring main unit according to claim 6, characterized in that: An insulating pull rod (25) is provided below the moving end of the vacuum interrupter (24); the moving conductive end of the vacuum interrupter (24) and the insulating pull rod (25) are connected to an outgoing bus bar (27) via a flexible connection (26); the insulating pull rod (25), the flexible connection (26) and the outgoing bus bar (27) are all located inside the epoxy resin cover (43).

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