Reciprocating type clearance motion contact device

Abstract

The utility model discloses a reciprocating type clearance motion contact device, which relates to the field of on-load tap-changers and comprises a frame body, a rotary driving lever rotationally mounted on the frame body, a swing frame rotationally mounted on the frame body, a moving contact fixed on the swing frame and a static contact fixed on the frame body. The swing frame is arranged on the circumferential side of the rotating track of the rotating deflector rod, swing deflector rods poked by the rotating deflector rod are arranged on the two sides of the swing frame, and at least one of the swing deflector rods on the same swing frame is located on the rotating track of the rotating deflector rod so as to be driven by the rotating deflector rod; the moving contacts and the static contacts are arranged in pairs and are communicated through abutting, two groups of contact pairs are arranged, the two moving contacts are respectively arranged corresponding to the positions of the two swinging driving levers on the two swinging frames, and the two static contacts are respectively arranged corresponding to the positions of the two moving contacts and are switched to be communicated with the moving and static contact pairs along with swinging of the swinging frames. The on-load tap-changer has the effect of preventing arc discharge in the contact switching process, and the performance of the on-load tap-changer can be optimized.

Description

Technical Field

[0001] The present application relates to the field of on-load tap changers, and in particular to a reciprocating gap motion contact device. Background Art

[0002] At present, the on-load tap changers used in transformers for rectification, smelting, and railway traction in China are mostly fast resistor switching, and work on the principle that the arc contact system extinguishes the arc when the current passes through the zero point. This switching principle is particularly severe under the condition of frequent transformer switching. The tap changer contacts are burned severely, the switch failure rate is high, and the oil carbonization speed is fast, which adds a lot of daily maintenance workload to the power supply department. The oil-immersed combined vacuum switch was created to completely solve this problem, which can significantly reduce operating costs and improve operational reliability and safety.

[0003] Conventional oil-immersed vacuum combination tap changers mainly rely on vacuum tubes to extinguish arcs, that is, the vacuum tubes are activated before the mechanical contacts are switched, thus ensuring that there is no load when the mechanical contacts are switched, thereby achieving the purpose of switching without arcs. However, if the mechanical contacts are switched when the vacuum tubes are not completely extinguished, arcing may occur due to charged slippage, which poses a certain safety hazard. For example, a polarity selector with a vacuum tube is disclosed in the domestic utility model patent with publication number CN219998080U.

[0004] In view of the above-mentioned related technologies, the switching mode of the traditional on-load tap changer mechanical contacts is sliding. The mechanical contacts are easily worn during the sliding process. The wear of the mechanical contacts will affect the contact and separation time of the contacts, and then affect the switching time. The inventor has designed a new mechanical contact device structure for use in on-load tap changers. Utility Model Content

[0005] In order to prevent the mechanical contacts in the on-load tap changer from slipping while being energized, the present application provides a reciprocating gap motion contact device, which has the effect of preventing relative slippage of the mechanical contacts during the switching process.

[0006] The present application provides a reciprocating gap motion contact device adopts the following technical solution:

[0007] A reciprocating gap motion contact device comprises a frame, a rotating lever rotatably mounted on the frame, a swing frame rotatably mounted on the frame, a moving contact fixed on the swing frame and a stationary contact fixed on the frame; the swing frame is arranged on the circumferential side of the rotation track of the rotating lever, and swing levers driven by the rotating lever are arranged on both sides of the swing frame, and at least one of the swing levers on the same swing frame is located on the rotation track of the rotating lever so as to be driven by the rotating lever; the moving contact and the stationary contact are arranged in pairs and connected by abutment, and two groups of contact pairs are arranged, and the two moving contacts are respectively arranged corresponding to the positions of the two swing levers on the two swing frames, and the two stationary contacts are respectively arranged corresponding to the positions of the two moving contacts and are a moving and stationary contact pair that is switched and connected with the swinging of the swing frame.

[0008] By adopting the above technical solution, the swing lever on the swing frame is driven by the rotation of the rotating lever, thereby driving the swing frame to rotate. The rotation of the swing frame will drive the moving contact thereon to follow and make a circular motion, so that the moving contact and the static contact can be directly separated or abutted. The connection and disconnection of the moving contact and the static contact are achieved by opening and closing actions. There will be no relative slip between the moving contact and the static contact, and the contact wear is effectively reduced, which helps to extend the service life of the on-load tap changer; it helps to prevent the occurrence of arcing.

[0009] Optionally, an arc groove with a smooth transition is arranged between the two swing levers, and the end of the rotating lever always abuts against the side wall of the arc groove.

[0010] By adopting the above technical solution, when the rotating lever switches and drives the two swing levers, it can drive the swing frame to rotate more smoothly when passing through the arc groove. The arc groove can play a switching transition role, ensuring the stability of the switching process.

[0011] Optionally, a roller is rotatably mounted on the abutting end of the rotating lever close to the swing lever, and the rotating axis of the roller is parallel to the rotating axis of the swing lever.

[0012] By adopting the above technical solution and installing rollers, the structural wear during the fluctuation process is reduced, thereby ensuring the stability and service life of the contact switching structure.

[0013] Optionally, the frame includes a barrel shell and a circular ring frame; a main shaft is coaxially mounted in the barrel shell, and the rotating lever is fixed on the main shaft; the static contact is fixed on the inner barrel wall of the barrel shell; the circular ring frame is fixed on the inner barrel wall of the barrel shell, the axial position of the circular ring frame is different from that of the static contact, and the swinging lever is rotatably mounted on the end face of the circular ring frame.

[0014] By adopting the above technical solution, the mechanical drive structure of the reciprocating gap motion contact device is installed in the barrel shell of the on-load tap changer.

[0015] Optionally, the rotating lever includes a sleeve and a rod body fixed on the circumferential side of the sleeve, the sleeve is fixed on the main shaft, and multiple rod bodies are arranged along the circumference of the sleeve; multiple swing levers are arranged along the circumference corresponding to the rod body; and multiple groups of moving contacts and static contacts are arranged along the circumference corresponding to the swing levers.

[0016] By adopting the above technical solution, multiple groups of moving and static contact pairs are synchronously driven to switch, so as to adapt to the control requirements of the on-load tap changer.

[0017] Optionally, the shaft sleeve includes a limit sleeve and a connecting sleeve; the connecting sleeve is a circular ring sleeve, and the rod body and the connecting sleeve are integrally arranged; the top of the limit sleeve is provided with an outer ring convexity, the limit sleeve is inserted in the connecting sleeve, the outer ring convexity of the limit sleeve abuts against the end face of the connecting sleeve and is circumferentially fixed by inserting a positioning connector, an insertion hole is penetrated through the connecting sleeve corresponding to the positioning connector, and an arc-shaped waist hole is penetrated through the outer ring convexity corresponding to the arc of the positioning connector and the connecting sleeve.

[0018] By adopting the above technical solution, the mounting hole of the positioning connector on the limit sleeve is set as an arc-shaped waist hole. After the positioning connector is used to connect the limit sleeve and the connecting sleeve, when the main shaft rotates to drive the limit sleeve to move, the limit sleeve will not directly drive the positioning connector and the connecting sleeve to rotate until the positioning connector abuts against the edge of the arc-shaped waist hole, and then the positioning connector and the connecting sleeve will be driven to rotate; when the limit sleeve is reversed, the limit sleeve rotates first, and the positioning connector abuts against the other end of the arc-shaped waist hole before the connecting sleeve and the rod body thereon are driven to move, and then the contact is switched. In the control process of the on-load tap changer, the vacuum tube is generally required to be disconnected first and then the contact is switched, that is, first disconnected and then connected, and the disconnection of the vacuum tube is also achieved by the rotation of the main shaft and the cam disk. The arc-shaped waist hole is set to achieve a large delayed movement of the rotating lever body, and a gap is generated between the disconnection action of the vacuum tube and the contact switching action, ensuring the control logic of first disconnection and then connection.

[0019] Optionally, a plurality of limiting convex strips are evenly arranged on the circumferential side wall of the main shaft along the circumferential direction; and a plurality of limiting grooves are arranged on the inner side of the sleeve corresponding to the limiting convex strips.

[0020] By adopting the above technical solution, the shaft sleeve and the main shaft are circumferentially fixed, so that the shaft sleeve and the rod body are driven to rotate by the main shaft.

[0021] Optionally, the moving contacts and the stationary contacts are arranged in a plurality of groups along the axial direction of the main shaft; and the corresponding contact pairs of the rotating lever and the swinging lever are arranged in a plurality of groups along the axial direction of the main shaft.

[0022] By adopting the above technical solution, according to the design of the on-load tap changer, multiple sets of moving contacts and stationary contacts are generally arranged along the axial direction.

[0023] Optionally, the frame further includes a contact fixing frame, the static contacts with the same circumferential position and different axial positions are fixed on the same contact fixing frame, and the contact fixing frame is fixed on the inner wall of the barrel shell.

[0024] By adopting the above technical solution, contacts in the same row are fixed on the contact fixing frame, which facilitates the installation and position unification of the contacts.

[0025] In summary, the present application has at least one of the following beneficial technical effects:

[0026] 1. The present application discloses a reciprocating gap motion contact device, which uses a rotatably mounted swing frame to fix a moving contact, and utilizes the swing of the swing frame to drive the moving contact and the static contact to switch the on-off state by directly opening and closing. There is no sliding or rolling friction during the contact switching process, which effectively avoids the arcing phenomenon of the traditional contact sliding structure, helps to optimize the performance of the on-load tap changer, and prolongs the service life of the on-load tap changer.

[0027] 2. The circumferential positioning accuracy during the driving process is guaranteed by the cooperation of the limiting convex strip on the main shaft and the limiting groove in the shaft sleeve; an arc groove is arranged on the swing frame to cooperate with the drive of the rotating lever, and a rotatably mounted roller is adopted at the end of the rod body, and the cooperation between the roller and the arc groove is stable and reliable.

[0028] 3. By setting an arc-shaped waist hole on the limit sleeve, a gap is created between the movement of the rotating lever and the spindle drive, so that the contact switching action can be performed after the vacuum tube is disconnected; the length of the annular waist hole can be adjusted according to the control requirements, thereby controlling the duration of the movement gap. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of an embodiment of the present application (top view, with the top circular ring frame hidden);

[0030] Figure 2 yes Figure 1 AA section view;

[0031] Figure 3 It is a schematic diagram of the coordination relationship between the rotating lever and the swing frame;

[0032] Figure 4 It is a structural schematic diagram of a limit sleeve.

[0033] Figure numerals: 1. main shaft; 11. limiting convex strip; 2. rotating lever; 21. shaft sleeve; 22. rod body; 23. roller; 24. limiting sleeve; 241. outer ring convex; 242. arc-shaped waist hole; 243. limiting groove; 25. connecting sleeve; 3. swing frame; 31. swing lever; 32. arc-shaped groove; 4. moving contact; 5. static contact; 6. contact fixing frame; 7. barrel shell; 8. circular ring frame; 9. positioning pin. DETAILED DESCRIPTION

[0034] The following is combined with Figure 1-4 This application is described in further detail.

[0035] The present application embodiment discloses a reciprocating gap motion contact device, referring to Figure 1 and Figure 2 , including a frame, which includes a barrel shell 7, a ring frame 8 and a contact fixing frame 6 of the on-load tap changer; a main shaft 1 is coaxially mounted in the barrel shell 7 for rotation, the ring frame 8 is coaxially fixed in the barrel shell 7 and the barrel shell 7 and the ring frame 8 are fixed by bolts, and the main shaft 1 passes through the center of the ring frame 8; the contact fixing frame 6 is a rectangular frame, and the length direction of the contact fixing frame 6 is arranged along the axial direction of the main shaft 1, and the contact fixing frame 6 is fixed to the inner wall of the barrel shell 7 with bolts.

[0036] The reciprocating gap motion contact 4 device also includes a rotating lever 2 fixed on the main shaft 1, a swing frame 3 rotatably mounted on the circular frame 8, a moving contact 4 fixed on the swing frame 3 and a stationary contact 5 fixed on the contact fixing frame 6; the rotating lever 2 and the swing frame 3 are arranged in two groups along the axial direction of the main shaft 1; two stationary contacts 5 are fixed on a single contact fixing frame 6, and the two stationary contacts 5 are arranged along the axial direction.

[0037] The swing frame 3 is arranged around the rotation track of the rotating lever 2, and a swing lever 31 driven by the rotating lever 2 is arranged on each side of the swing frame 3; at any action stage, at least one of the swing levers 31 on the swing frame 3 is located on the rotation track of the end of the rotating lever 2, so that the rotating lever 2 drives the swing frame 3 to rotate. The moving contact 4 and the stationary contact 5 are arranged in pairs and connected by abutment. The contact pairs composed of the moving contact 4 and the stationary contact 5 are arranged in two groups corresponding to the two swing directions of the single swing frame 3. The two moving contacts 4 are arranged corresponding to the positions of the two swing levers 31 on the two swing frames 3, respectively. The moving contact 4 is fixed to the end of the swing lever 31 away from the rotating lever 2 on the side with a bolt connector.

[0038] refer to Figure 2 and Figure 3A roller 23 is rotatably mounted on the abutting end of the rotating lever 2 close to the swing lever 31, and the rotating axis of the roller 23 is parallel to the rotating axis of the swing lever 31; a smoothly transitioned arc groove 32 is set between the two swing levers 31, and the end of the rotating lever 2 always abuts against the side wall of the arc groove 32.

[0039] refer to Figure 3 and Figure 4 The rotating lever 2 includes a sleeve 21 and a rod body 22 fixed on the circumferential side of the sleeve 21, the sleeve 21 is fixed on the main shaft 1, and three rod bodies 22 are arranged along the circumference of the sleeve 21; a plurality of swing levers 31 are arranged along the circumferential direction corresponding to the rod body 22, and a plurality of contacts composed of a moving contact 4 and a stationary contact 5 are arranged along the circumferential direction corresponding to the swing lever 31.

[0040] A plurality of limiting convex strips 11 are evenly arranged on the circumferential side wall of the main shaft 1. The shaft sleeve 21 includes a limiting sleeve 24 and a connecting sleeve 25; the connecting sleeve 25 is a circular ring sleeve, and the rod body 22 and the connecting sleeve 25 are integrally arranged; an outer ring convex 241 is arranged at the top of the limiting sleeve 24, and the limiting sleeve 24 is inserted in the connecting sleeve 25, and a plurality of limiting grooves 243 are arranged on the inner side of the limiting sleeve 24 corresponding to the limiting convex strips 11. The outer ring protrusion 241 of the limit sleeve 24 abuts against the end surface of the connecting sleeve 25 and is circumferentially fixed by inserting a positioning connector. The positioning connector is a T-shaped positioning pin 9, and the lower end of the positioning pin 9 is fixed with a retaining spring. A plug-in hole is penetrated through the connecting sleeve 25 corresponding to the positioning connector, and an arc-shaped waist hole 242 is penetrated through the arc of the outer ring protrusion 241 corresponding to the positioning connector and the connecting sleeve 25. The arc-shaped waist hole 242 can make a gap between the movement of the limit sleeve 24 and the connecting sleeve 25 to cooperate with the first-break-before-make required by the on-load tap changer control. There is a gap between the starting movement of the connecting sleeve 25 and the rod body 22 thereon and the starting movement of the main shaft 1. This gap movement can make time for the vacuum tube disconnection action of the on-load tap changer.

[0041] The implementation principle of a reciprocating gap motion contact device disclosed in the embodiment of the present application is: using a rotatably mounted swing frame 3 to fix the moving contact 4, using the swing of the swing frame 3 to drive the moving contact 4 and the static contact 5 to switch the on-off state by directly opening and closing, effectively avoiding the arcing phenomenon of the traditional contact sliding structure, and helping to optimize the performance of the on-load tap changer. The arc-shaped waist hole on the limit sleeve 24 allows the main shaft 1 to drive the rotating lever 2 to perform gap motion as a whole, that is, there is a gap between the start of the main shaft movement and the movement time of the rod body 22 of the rotating lever 2, and the switching action of the contact is also started after the main shaft starts to move, so that it can be ensured that the main shaft controls the vacuum tube to disconnect first, and then the mechanical contact structure is disconnected, which can further avoid the occurrence of arcing.

[0042] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A reciprocating gap motion contact device, characterized in that: The invention comprises a frame, a rotary lever (2) rotatably mounted on the frame, a swing frame (3) rotatably mounted on the frame, a moving contact (4) fixed on the swing frame (3), and a stationary contact (5) fixed on the frame; the swing frame (3) is arranged on the peripheral side of the rotation track of the rotary lever (2); swing levers (31) driven by the rotary lever (2) are arranged on both sides of the swing frame (3); at least one of the swing levers (31) on the same swing frame (3) is located on the rotation track of the rotary lever (2) so as to be driven by the rotary lever (2); the moving contact (4) and the stationary contact (5) are arranged in pairs and connected by abutment; two groups of contact pairs are arranged; the two moving contacts (4) are arranged corresponding to the positions of the two swing levers (31) on the two swing frames (3), and the two stationary contacts (5) are arranged corresponding to the positions of the two moving contacts (4) and are a pair of moving and stationary contacts (5) switched on with the swing of the swing frame (3).

2. A reciprocating gap motion contact device according to claim 1, characterized in that: An arc-shaped groove (32) with a smooth transition is provided between the two swing levers (31), and the end of the rotary lever (2) always abuts against the side wall of the arc-shaped groove (32).

3. A reciprocating gap motion contact device according to claim 2, characterized in that: A roller (23) is rotatably mounted on the abutting end of the rotary lever (2) close to the swing lever (31), and the rotation axis of the roller (23) is parallel to the rotation axis of the swing lever (31).

4. A reciprocating gap motion contact device according to claim 1, characterized in that: The frame comprises a barrel shell (7) and a circular frame (8); a main shaft (1) is coaxially rotatably mounted in the barrel shell (7), and the rotating lever (2) is fixed on the main shaft (1); the stationary contact (5) is fixed on the inner barrel wall of the barrel shell (7); the circular frame (8) is fixed on the inner barrel wall of the barrel shell (7), the circular frame (8) and the stationary contact (5) are at different axial positions, and the swing lever (31) is rotatably mounted on the end surface of the circular frame (8).

5. A reciprocating gap motion contact device according to claim 4, characterized in that: The rotary lever (2) comprises a shaft sleeve (21) and a rod body (22) fixed on the circumferential side of the shaft sleeve (21); the shaft sleeve (21) is fixed on the main shaft (1); a plurality of the rod bodies (22) are arranged along the circumference of the shaft sleeve (21); a plurality of the swing levers (31) are arranged along the circumference corresponding to the rod bodies (22); and a plurality of the moving contacts (4) and the stationary contacts (5) are arranged along the circumference corresponding to the swing levers (31).

6. A reciprocating gap motion contact device according to claim 5, characterized in that: The shaft sleeve (21) comprises a limiting sleeve (24) and a connecting sleeve (25); the connecting sleeve (25) is a circular ring sleeve, and the rod body (22) and the connecting sleeve (25) are integrally arranged; an outer ring protrusion (241) is arranged at the top end of the limiting sleeve (24), the limiting sleeve (24) is inserted into the connecting sleeve (25), the outer ring protrusion (241) of the limiting sleeve (24) abuts against the end surface of the connecting sleeve (25) and is circumferentially fixed by inserting a positioning connecting piece, a plug-in hole is penetrated through the connecting sleeve (25) corresponding to the positioning connecting piece, and an arc-shaped waist hole (242) is penetrated through the outer ring protrusion (241) corresponding to the arc of the positioning connecting piece and the connecting sleeve (25).

7. A reciprocating gap motion contact device according to claim 5, characterized in that: A plurality of limiting convex strips (11) are evenly arranged along the circumferential direction on the circumferential side wall of the main shaft (1); and a plurality of limiting grooves (243) are arranged on the inner side of the shaft sleeve (21) corresponding to the limiting convex strips (11).

8. A reciprocating gap motion contact device according to claim 7, characterized in that: The movable contacts (4) and the stationary contacts (5) are arranged in a plurality of groups along the axial direction of the main shaft (1); and the corresponding contact pairs of the rotating lever (2) and the swing lever (31) are arranged in a plurality of groups along the axial direction of the main shaft (1).

9. A reciprocating gap motion contact device according to claim 8, characterized in that: The frame body also includes a contact fixing frame (6), the stationary contacts (5) having the same circumferential position but different axial positions are fixed on the same contact fixing frame (6), and the contact fixing frame (6) is fixed on the inner wall of the barrel shell (7).

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