A three-phase column type vacuum circuit breaker

Abstract

The present invention discloses a three-phase column-type vacuum circuit breaker, comprising a mechanism housing, three sealed poles and three operating mechanisms, each operating mechanism comprising a permanent magnet device and a trip spring, a drive spindle being provided in the mechanism housing along the arrangement direction of the three operating mechanisms, the drive spindle being synchronously linked with the three insulating pull rods through a linkage structure, a transmission crank arm being fixed to one end of the drive spindle, a trip handle being provided on the outside of the mechanism housing, a driving member being provided inside the mechanism housing, the transmission crank arm being on the rotation path of the driving member, and the driving member abutting against the transmission crank arm to drive the drive spindle to rotate when the trip handle is rotated to trip. The structure of the vacuum circuit breaker of the present invention has been optimized, a drive spindle is provided in the mechanism housing and a suitable trip handle is configured, and the manual trip operation is convenient and reliable through the synchronous linkage between the drive spindle and the three operating mechanisms, and has good practicality and generalizability.

Description

Technical Field

[0001] The invention relates to a three-phase column type vacuum circuit breaker, belonging to the technical field of vacuum circuit breaker structure design. Background Art

[0002] An outdoor vacuum circuit breaker is a circuit breaker installed and used outdoors, usually installed on a pole tower. As a switching device for controlling the disconnection of high-voltage lines, vacuum circuit breakers are widely used in high-voltage power transmission and distribution systems. The permanent magnetic operating mechanism of a traditional three-phase column-type vacuum circuit breaker usually has only one permanent magnetic device (such as the structure disclosed in patent document CN202905591U). The permanent magnetic device is used to control the three-phase synchronous closing of the vacuum circuit breaker, and the opening is driven by the elastic force released by the opening spring to control the three-phase synchronous opening of the vacuum circuit breaker. In order to achieve manual opening in an emergency, the vacuum circuit breaker is also equipped with a manual opening mechanism. However, the manual opening mechanism currently used in three-phase vacuum circuit breakers is difficult to directly match and use in the permanent magnetic operating mechanism containing three permanent magnetic devices. Therefore, it is necessary to design a suitable manual opening structure. Summary of the Invention

[0003] In view of the problems pointed out in the background technology, the present invention provides a three-phase column type vacuum circuit breaker with a rationally optimized structure.

[0004] The technical solution for achieving the purpose of the present invention is:

[0005] A three-phase column-type vacuum circuit breaker comprises a mechanism box, three sealed poles fixed on the mechanism box, and an operating mechanism installed in the mechanism box. There are three operating mechanisms, and each of them is connected to a moving contact on a vacuum interrupter in each sealed pole through an insulating pull rod. Each operating mechanism comprises a permanent magnet device and a trip spring. When the permanent magnet device is energized, it drives the insulating pull rod to control the closing of the vacuum interrupter. When the permanent magnet device is de-energized, the trip spring drives the insulating pull rod to control the opening of the vacuum interrupter. A drive main shaft is provided in the mechanism box along the arrangement direction of the three operating mechanisms. The drive main shaft is synchronously linked to the three insulating pull rods through a linkage structure. A transmission crank arm is fixed to one end of the drive main shaft. A trip handle is provided on the outside of the mechanism box. A driving member linked to the trip handle is provided inside the mechanism box. The transmission crank arm is on the rotation path of the driving member. When the trip handle rotates to open, the driving member abuts against the transmission crank arm to drive the drive main shaft to rotate.

[0006] The above solution further includes a reset spring. Under the action of the reset spring, the trip handle is in an initial position. In this state, the driving member does not block the rotation of the transmission arm.

[0007] In the above scheme, a rotating shaft is rotatably mounted on the mechanism box, and the driving member and the trip handle are respectively fixed at the inner and outer ends of the rotating shaft; the driving member includes a fixing block fixedly connected to the rotating shaft and a driving shaft fixed to the fixing block, and a limiting column is fixed on the inner wall of the mechanism box, and when the trip handle is in the initial position, the fixing block abuts against the limiting column.

[0008] In the above solution, the reset spring is a tension spring connected between the fixing block and the tension spring hook, and the tension spring hook is fixed on the mechanism box.

[0009] In the above scheme, the bottom end of each insulating pull rod is connected to a connecting block and the connecting block is fixed on the moving iron core of the permanent magnet device. A connecting arm is fixed at a position corresponding to each connecting block on the driving main shaft. A connecting slot is provided on the connecting block, and a connecting arm is provided on the connecting arm. The connecting slot and the connecting arm are plugged into each other to form the linkage structure.

[0010] In the above solution, a plurality of connection slots are arranged at intervals on each connection block, and ribs are formed between adjacent connection slots. The number of the connection arms is equal to the number of the connection slots, and the plurality of connection arms are plugged into the plurality of connection slots in a one-to-one correspondence.

[0011] The present invention has positive effects: in the three-phase column-type vacuum circuit breaker of the present invention, a driving spindle is set in the mechanism box and a suitable tripping handle is configured, and the three-phase action synchronization is realized by connecting the driving spindle and the three operating mechanisms. When opening, the tripping handle is rotated to drive the driving spindle to rotate and drive the insulating pull rods in the three operating mechanisms to open the circuit. The structural design of the present invention is reasonable, can better adapt to installation and use in three-phase column-type vacuum circuit breakers, and has good practicality and popularization. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 Schematic diagram of the three-dimensional structure of the vacuum circuit breaker in the present invention;

[0013] Figure 2 It is a schematic structural diagram of the vacuum circuit breaker of the present invention after omitting the mechanism box and the sealed pole;

[0014] Figure 3 It is a partial structural diagram of the three-phase column type vacuum circuit breaker in the present invention;

[0015] Figure 4 This is a schematic diagram of the three-dimensional structure of the opening handle, the driving member and the rotating shaft when they are connected in coordination in the present invention;

[0016] Figure 5 Schematic diagram of the three-dimensional structure of the transmission crank arm in the present invention;

[0017] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting block in the present invention.

[0018] The reference numerals shown in the figure are: 1-mechanism box; 11-limiting column; 12-tension spring hook; 2-sealed pole; 3-operating mechanism; 31-permanent magnet device; 32-trip spring; 4-insulating pull rod; 41-connecting block; 411-connecting slot; 5-driving main shaft; 51-transmission crank arm; 52-connecting crank arm; 521-connecting arm; 6-trip handle; 7-driving member; 71-fixed connection block; 72-driving shaft; 8-reset spring; 9-rotating shaft. DETAILED DESCRIPTION

[0019] The specific structure of the present invention is described below with reference to the accompanying drawings:

[0020] A three-phase column type vacuum circuit breaker, such as Figures 1 to 6As shown, it includes a mechanism box 1, three sealed poles 2 fixed on the mechanism box 1, and an operating mechanism 3 installed in the mechanism box 1. There are three operating mechanisms 3, and each of them is connected to the moving contact on the vacuum interrupter in each sealed pole 2 through an insulating pull rod 4. Each operating mechanism 3 includes a permanent magnet device 31 and a trip spring 32. When the permanent magnet device 31 is energized, it drives the moving iron core to move and then drives the insulating pull rod 4 to control the closing of the vacuum interrupter. When the permanent magnet device 31 is de-energized, the trip spring 32 drives the insulating pull rod 4 to close the vacuum interrupter. Rod 4 controls the opening of the vacuum interrupter. A driving spindle 5 is provided in the mechanism box 1 along the arrangement direction of the three operating mechanisms 3. The driving spindle 5 is synchronously linked with the three insulating pull rods 4 through a linkage structure. A transmission crank arm 51 is fixed to one end of the driving spindle 5. A trip handle 6 is installed outside the mechanism box 1. A driving member 7 linked to the trip handle 6 is provided inside the mechanism box 1. The transmission crank arm 51 is on the rotation path of the driving member 7. When the trip handle 6 rotates to open, it is driven by the driving member 7. The driving shaft 5 is driven by the driving member 7 linked to the opening handle 6 and the driving member 7 is driven by the driving member 7 to rotate in the opening direction. During the rotation of the driving shaft 5, a downward driving force is generated on the insulating rod 4, so that the insulating rod 4 drives the moving contact in the vacuum interrupter to move downward and separate from the static contact, thereby driving the three vacuum interrupters to open synchronously. In addition, in actual use, when one operating mechanism 3 fails, due to the linkage effect of the driving shaft 5, the three-phase vacuum circuit breaker can still be driven to work when the other two operating mechanisms 3 are operating normally. Therefore, the manual opening structure design in this embodiment is more suitable for the use of three-phase vacuum circuit breakers and has good practicality.

[0021] In order to enable the trip handle 6 to automatically rotate back to its original position when the manual trip operation is completed, a reset spring 8 is further provided in this embodiment. Under the action of the reset spring 8, the trip handle 6 is in its initial position. In this state, the driving member 7 does not block the rotation of the transmission crank arm 51. That is, when the trip handle 6 is in its initial position, the driving member 7 does not interfere with the normal operation of the operating mechanism in the three-phase vacuum circuit breaker. When manual tripping is performed, the trip handle 6 is rotated and the reset spring 8 is stored in the process. After the manual trip is completed, the trip handle 6 is released, and the reset spring 8 releases the stored energy, driving the trip handle 6 to rotate and return to its initial position. In the absence of the reset spring 8, the trip handle 6 can be manually reset.

[0022] As a further preferred embodiment of this embodiment, Figure 3 As shown, the mechanism box 1 is rotatably provided with a rotating shaft 9, and the driving member 7 and the trip handle 6 are respectively fixed at the inner and outer ends of the rotating shaft 9, and the synchronous rotation linkage of the driving member 7 and the trip handle 6 is realized through the rotating shaft 9. A bearing can be provided between the rotating shaft 9 and the mechanism box 1 to ensure the flexibility of rotation; the driving member 7 includes a connecting block 71 fixedly connected to the rotating shaft 9 and a driving shaft 72 fixed to the connecting block 71, and a limiting column 11 is fixed on the inner wall of the mechanism box 1. When the trip handle 6 is in the initial position, the connecting block 71 abuts against the limiting column 11, thereby playing a role in resisting and limiting the trip handle 6 when it is in the initial position.

[0023] As a specific solution in the above implementation scheme, the reset spring 8 in this embodiment adopts a tension spring, which is connected between the fixing block 71 and the tension spring hook 12. The tension spring hook 12 is fixed on the mechanism box 1, so that the tension spring is suspended and installed.

[0024] In a preferred embodiment of this embodiment, Figures 5 and 6 As shown, the bottom end of each insulating pull rod 4 is connected to a connecting block 41 and the connecting block 41 is fixed on the moving iron core of the permanent magnet device 31, and a connecting crank arm 52 is fixed at a position corresponding to each connecting block 41 on the driving main shaft 5, and a connecting slot 411 is provided on the connecting block 41, and a connecting arm 521 is provided on the connecting crank arm 52. The connecting slot 411 and the connecting arm 521 are plugged together to form the linkage structure; the connecting crank arm 52 in this scheme is plugged and connected with the connecting slot 411, thereby linking the rotation of the driving main shaft 5 with the up and down movement of the insulating pull rod 4.

[0025] In a further preferred embodiment of this embodiment, Figures 5 and 6 As shown, in this embodiment, a plurality of connecting slots 411 are arranged at intervals on each connecting block 41, and ribs are formed between adjacent connecting slots 411. The number of the connecting arms 521 is equal to the number of the connecting slots 411, and the plurality of connecting arms 521 are plugged in one-to-one with the plurality of connecting slots 411. The one-to-one plug-in cooperation of the plurality of connecting slots 411 and the plurality of connecting crook arms 52 makes the connection reliable and effective, and can withstand greater force. The presence of the ribs ensures the strength of the connecting block 41.

[0026] Obviously, the above embodiments of the present invention are merely examples for the purpose of illustrating the present invention, and are not intended to limit the embodiments of the present invention. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all embodiments here. However, obvious variations or modifications arising from the essence of the present invention remain within the scope of protection of the present invention.

Claims

1. A three-phase column type vacuum circuit breaker, comprising a mechanism box (1), three sealed poles (2) fixed on the mechanism box (1), and an operating mechanism (3) installed in the mechanism box (1), wherein the number of the operating mechanisms (3) is three, and each of the operating mechanisms (3) is connected to a moving contact on a vacuum interrupter in each sealed pole (2) via an insulating pull rod (4), each operating mechanism (3) comprises a permanent magnet device (31) and a trip spring (32), wherein when the permanent magnet device (31) is energized, the insulating pull rod (4) drives the vacuum interrupter to close, and when the permanent magnet device (31) is de-energized, the trip spring (32) drives the insulating pull rod (4) to open, wherein the circuit breaker is characterized in that: A driving main shaft (5) is provided in the mechanism box (1) along the arrangement direction of the three operating mechanisms (3). The driving main shaft (5) is synchronously linked with the three insulating pull rods (4) through a linkage structure. A transmission crank arm (51) is fixed to one end of the driving main shaft (5). A trip handle (6) is provided on the outside of the mechanism box (1). A driving member (7) linked with the trip handle (6) is provided inside the mechanism box (1). The transmission crank arm (51) is on the rotation path of the driving member (7). When the trip handle (6) rotates to trip, the driving member (7) abuts against the transmission crank arm (51) to drive the driving main shaft (5) to rotate. The bottom end of each insulating pull rod (4) is connected to the driving member (7). A connecting block (41) is connected and fixed to the moving iron core of the permanent magnet device (31); a connecting arm (52) is fixed to a position on the driving main shaft (5) corresponding to each connecting block (41); a connecting slot (411) is provided on the connecting block (41); a connecting arm (521) is provided on the connecting arm (52); the connecting slot (411) and the connecting arm (521) are plugged and matched to form the linkage structure; a rotating shaft (9) is rotatably mounted on the mechanism housing (1); the driving member (7) and the trip handle (6) are respectively fixed to the inner and outer ends of the rotating shaft (9); a circular hole is provided on the end of the trip handle (6) away from the rotating shaft (9).

2. The three-phase column type vacuum circuit breaker according to claim 1, characterized in that: It also includes a reset spring (8), under the action of which the trip handle (6) is in an initial position. In this state, the driving member (7) does not block the rotation of the transmission crank arm (51).

3. The three-phase column type vacuum circuit breaker according to claim 2, characterized in that: The driving member (7) comprises a connecting block (71) fixedly connected to the rotating shaft (9) and a driving shaft (72) fixed to the connecting block (71); a limiting column (11) is fixed on the inner wall of the mechanism housing (1); and when the trip handle (6) is in the initial position, the connecting block (71) abuts against the limiting column (11).

4. The three-phase column type vacuum circuit breaker according to claim 3, characterized in that: The return spring (8) is a tension spring connected between the fixing block (71) and the tension spring hook (12), and the tension spring hook (12) is fixed on the mechanism box (1).

5. The three-phase column type vacuum circuit breaker according to claim 1, characterized in that: A plurality of connection slots (411) are arranged at intervals on each connection block (41), and ribs are formed between adjacent connection slots (411). The number of the connection arms (521) is equal to the number of the connection slots (411), and the plurality of connection arms (521) are plugged into the plurality of connection slots (411) in a one-to-one correspondence.

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