A double-acting arc-extinguishing chamber based on ball screw drive

Abstract

This utility model relates to a double-acting arc-extinguishing chamber based on ball screw transmission, including a housing, a moving contact and a stationary contact disposed within the housing, a ball screw rotatably disposed within the housing, a first fixed block fixedly connected to the moving contact, and a second fixed block fixedly connected to the stationary contact. One end of the ball screw is connected to a drive device. The ball screw has a first threaded section and a second threaded section with opposite directions of rotation. The first fixed block is threadedly connected to the first threaded section, and the second fixed block is threadedly connected to the second threaded section. A first guide rail is fixedly disposed on the housing, slidingly engaging with the first fixed block, and a second guide rail is slidably engaged with the second fixed block. This utility model, through ball screw transmission, converts rotational motion into linear motion of the first and second fixed blocks, realizing the opposite or opposite movements of the moving and stationary contacts, improving the closing and opening speeds of the arc-extinguishing chamber, shortening the breaking time, and effectively improving the breaking capacity of the circuit breaker.

Description

Technical Field

[0001] This utility model relates to the field of high-voltage circuit breaker technology, and in particular to a double-acting arc-extinguishing chamber structure based on ball screw drive, specifically a double-acting arc-extinguishing chamber based on ball screw drive. Background Technology

[0002] High-voltage circuit breakers are critical switching devices in power systems, used to disconnect and connect circuits under normal and fault conditions.

[0003] Traditional high-voltage circuit breakers mostly adopt a single-action scheme, that is, only the moving contact moves while the stationary contact remains stationary. During the breaking process, in order to ensure the breaking capacity and the ability to restore voltage, the moving contact needs to have a large movement speed, which leads to a large operating work of the mechanism, an increase in the strength and weight of the transmission components, and a decrease in equipment reliability.

[0004] Furthermore, traditional single-action solutions are difficult to achieve high short-circuit current interruption. Limited by equipment size, inflation pressure, and mechanism operating power, they cannot meet the demands of modern power grids for high-capacity interruption technology. Utility Model Content

[0005] This invention addresses the shortcomings of existing technologies by providing a double-action arc-extinguishing chamber based on ball screw transmission, which realizes double-action in the breaking process and improves the breaking capacity and reliability of the circuit breaker.

[0006] This utility model is achieved through the following technical solution: a double-acting arc-extinguishing chamber based on ball screw transmission is provided, including a housing, and a moving contact and a stationary contact disposed inside the housing and arranged axially opposite to each other. It also includes a ball screw rotatably disposed inside the housing, a first fixing block fixedly connected to the moving contact, and a second fixing block fixedly connected to the stationary contact. One end of the ball screw is connected to a driving device. The ball screw has a first threaded section and a second threaded section with opposite directions of rotation. The first fixing block is sleeved on the ball screw and threadedly connected to the first threaded section. The second fixing block is sleeved on the ball screw and threadedly connected to the second threaded section. A first guide rail that slides against the first fixing block and a second guide rail that slides against the second fixing block are fixed on the housing.

[0007] In use, this solution utilizes the rotation of the ball screw to drive the first and second fixed blocks to move relative to or away from each other, thereby causing the moving contact and the stationary contact to move away from or towards each other to complete the breaking action. This increases the relative speed between the moving contact and the stationary contact, thus improving the breaking capacity and reliability.

[0008] As an optimization, the portion of the moving contact fixed to the first fixed block is located on one side of the ball screw, while the portion of the stationary contact fixed to the second fixed block is located on the other side of the ball screw. This optimized solution places the connection portion of the moving contact and the first fixed block on different sides of the connection portion of the stationary contact and the second fixed block, avoiding mutual interference when the moving and stationary contacts move, and further improving the reliability of the switching action.

[0009] As an optimization, the drive device includes a drive motor mounted on the housing. The output shaft of the drive motor is connected to a ball screw via a coupling. Both ends of the ball screw are rotatably connected to the housing via bearing seats. This optimized solution uses a drive motor as the drive device and connects it to the ball screw via a coupling. The structure is simple and easy to install. By adding bearing seats, the stability of the ball screw is improved, and the frictional resistance during rotation is reduced.

[0010] As an optimization, the end of the moving contact that contacts the stationary contact, and the end of the stationary contact that contacts the moving contact, are respectively provided with a conductive plating layer. This optimization scheme improves the conductivity and arc erosion resistance of the contacts by providing conductive plating layers.

[0011] As an optimization, the moving contact includes a contact body and a connecting arm fixedly connected to the contact body. The connecting arm extends from one side of the second fixing block to the first fixing block and is fixedly connected to the first fixing block. This optimized solution, by providing a connecting arm, facilitates the relative fixed connection between the moving contact and the first fixing block, so that when the first fixing block and the second fixing block are close together, the moving contact is disconnected from the stationary contact, and when the first fixing block and the second fixing block are far apart, the moving contact is in contact with the stationary contact.

[0012] As an optimization, the first guide rail is fixed with a front limit block I and a rear limit block I, which are arranged along the moving direction of the first fixed block. The distance between the front limit block I and the rear limit block I is adapted to the maximum stroke of the first fixed block. This optimization scheme, by setting the front limit block I and the rear limit block I, forms an extreme limit on the movement of the first fixed block, preventing the first fixed block from slipping off the first guide rail.

[0013] As an optimization, the second guide rail is fixed with a front limit block II and a rear limit block II arranged along the moving direction of the second fixed block. The distance between the front limit block II and the rear limit block II is adapted to the maximum stroke of the second fixed block. This optimization scheme, by setting the front limit block II and the rear limit block II, forms an extreme limit on the movement of the second fixed block, preventing the second fixed block from slipping off the second guide rail.

[0014] The beneficial effects of this utility model are as follows: by using ball screw transmission, the rotational motion is converted into the linear motion of the first fixed block and the second fixed block, realizing the opposite or opposite motion of the moving contact and the stationary contact, which improves the closing and opening speed of the arc-extinguishing chamber, shortens the breaking time, and effectively improves the breaking capacity of the circuit breaker. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the closed state of this utility model;

[0016] Figure 2 This is a schematic diagram of the tripped state of this utility model;

[0017] Figure 3 This is a schematic diagram of the structure at the guide rail.

[0018] Figure 4 This is a top view of the guide rail.

[0019] As shown in the figure:

[0020] 1. Ball screw, 2. First fixed block, 3. Second fixed block, 4. Second guide rail, 5. Moving contact, 6. Stationary contact, 7. Bearing housing, 8. Drive unit, 9. Coupling, 10. Housing, 11. First threaded section, 12. Second threaded section, 41. Limiting block II. Detailed Implementation

[0021] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0022] like Figure 1 The double-acting arc-extinguishing chamber based on ball screw drive is shown, including a housing 10, and a moving contact 5 and a stationary contact 6 disposed inside the housing 10 and arranged opposite each other along the axial direction. The end of the moving contact that contacts the stationary contact and the end of the stationary contact that contacts the moving contact are respectively provided with a conductive coating. The conductive coating has good conductivity to improve the conductivity and arc erosion resistance of the contacts.

[0023] This embodiment also includes a ball screw 1 rotatably disposed inside the housing 10, a first fixing block 2 fixedly connected to the moving contact 5, and a second fixing block 3 fixedly connected to the stationary contact 6. The first fixing block and the second fixing block are respectively provided with mounting holes for mounting the moving contact and the stationary contact. The moving contact 5 and the stationary contact 6 are fixedly connected to the fixing blocks by bolts or rivets.

[0024] One end of the ball screw is connected to the drive device 8. The ball screw 1 has a first threaded section 11 and a second threaded section 12 with opposite directions of rotation. The first fixing block 2 is sleeved on the ball screw and threadedly connected to the first threaded section 11, and the second fixing block 3 is sleeved on the ball screw and threadedly connected to the second threaded section 12. A first guide rail that slides with the first fixing block and a second guide rail 4 that slides with the second fixing block are fixed on the outer casing. The second guide rail has a groove that extends axially and is adapted to the second fixing block, and the first guide rail has a groove that extends axially and is adapted to the first fixing block. The first guide rail guides the movement of the first fixing block and prevents the first fixing block from rotating with the ball screw. The thread action of the screw causes the first fixing block to move axially. The second guide rail guides the movement of the second fixing block and prevents the second fixing block from rotating with the ball screw. The thread action of the screw causes the second fixing block to move axially. When the ball screw rotates, the first threaded section 11 and the second threaded section 12 rotate in opposite directions, causing the first fixed block and the second fixed block to move closer to or further apart.

[0025] The portion of the moving contact that is fixed to the first fixed block is located on one side of the ball screw, while the portion of the stationary contact that is fixed to the second fixed block is located on the other side of the ball screw. This avoids interference between the portion of the moving contact that is connected to the first fixed block and the portion of the stationary contact that is connected to the second fixed block when the first fixed block and the second fixed block move relative to or away from each other.

[0026] In this embodiment, the moving contact includes a contact body and a connecting arm fixedly connected to the contact body. The connecting arm extends from one side of the second fixing block to the first fixing block and is fixedly connected to the first fixing block.

[0027] The first guide rail is fixed with a front limit block I and a rear limit block I arranged along the moving direction of the first fixed block. The distance between the front limit block I and the rear limit block I is adapted to the maximum stroke of the first fixed block to prevent the first fixed block from detaching from the first guide rail.

[0028] The second guide rail is fixed with a front limit block II and a rear limit block II 41 arranged along the moving direction of the second fixed block. The distance between the front limit block II and the rear limit block II is adapted to the maximum stroke of the second fixed block 3 to prevent the second fixed block from detaching from the second guide rail.

[0029] The drive device 8 in this embodiment includes a drive motor mounted on the housing. The output shaft of the drive motor is connected to a ball screw via a coupling 9. Both ends of the ball screw are rotatably connected to the housing via bearing seats 7. Specifically, one end of the coupling is fixedly connected to the output shaft of the drive motor, and the other end of the coupling is fixedly connected to the ball screw. The coupling, the ball screw, and the output shaft of the drive motor are coaxially arranged.

[0030] The ball screw 1 is driven to rotate by the drive device 8. When the drive device 8 drives the ball screw 1 to rotate, the first fixed block 2 and the second fixed block 3 move towards or away from each other along the axial direction of the ball screw 1 under the action of the thread of the ball screw 1 and the restriction of the guide rail. This causes the moving contact 5 and the stationary contact 6 to move towards or away from each other, thereby realizing the closing or opening operation of the arc extinguishing chamber.

[0031] During the closing process, the drive device 8 drives the ball screw 1 to rotate, causing the first fixed block 2 and the second fixed block 3 to move away from each other, which in turn causes the moving contact 5 and the stationary contact 6 to move closer together and make contact, thus completing the closing operation. During the opening process, the drive device 8 drives the ball screw 1 to rotate in the opposite direction, causing the moving contact fixing part 2 and the stationary contact fixing part 3 to move closer together, which in turn causes the moving contact 5 and the stationary contact 6 to move away from each other and separate, thus completing the opening operation.

[0032] This invention utilizes ball screw transmission to convert rotary motion into linear motion, enabling the moving and stationary contacts to move in opposite directions or away from each other. This improves the closing and opening speed of the arc-extinguishing chamber, shortens the breaking time, and effectively enhances the circuit breaker's breaking capacity. The high transmission precision of the ball screw ensures the synchronization and accuracy of the moving and stationary contacts, resulting in uniform contact pressure between the contacts and improving the reliability and service life of the arc-extinguishing chamber. Furthermore, the self-locking property of the ball screw allows it to maintain its position after opening or closing, eliminating the need for additional locking devices, simplifying the arc-extinguishing chamber's structure, and reducing the failure rate.

[0033] Compared to the traditional single-action solution, this invention increases the relative speed of the moving and stationary contacts by moving simultaneously without increasing the operational work of the mechanism. This improves the breaking capacity of the arc-extinguishing chamber, reduces the requirements for the strength and weight of the transmission components, and enhances the reliability and safety of the equipment. The guide rail guides and restricts the movement of the fixed block, ensuring that it can only move forward or backward along the axial direction of the ball screw, preventing deflection during movement and improving stability and accuracy.

[0034] Furthermore, the ball screw transmission structure of this invention effectively solves the problems existing in the current linkage transmission type of double-acting arc-extinguishing chamber. In the linkage transmission type, the connecting rod is subjected to a large lateral force during movement, which can easily lead to deformation of the connecting rod and affect the transmission accuracy and reliability. However, the ball screw transmission scheme of this invention, through the threaded engagement between the ball screw and the fixed part, and the restriction of the fixed part's movement by the guide rail, greatly reduces the lateral force during transmission and avoids the problem of connecting rod deformation. At the same time, the ball screw is relatively easy to manufacture and has high precision, which can effectively reduce the manufacturing difficulty and cost of parts and improve the mechanical reliability of the entire arc-extinguishing chamber.

[0035] This invention improves the breaking capacity, reliability, and service life of the arc-extinguishing chamber by adopting a double-acting arc-extinguishing chamber structure with ball screw drive, providing an advanced solution in the field of high-voltage circuit breaker technology.

[0036] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A double-mover arc-extinguishing chamber based on ball screw drive, comprising a housing (10), and a movable contact (5) and a static contact (6) disposed in the housing (10) and disposed in opposite directions along the axial direction, characterized in that: It also includes a ball screw (1) rotatably disposed in the housing, a first fixed block (2) fixedly connected to the moving contact (5), and a second fixed block (3) fixedly connected to the stationary contact (6). One end of the ball screw is connected to a drive device (8). The ball screw is provided with a first threaded section (11) and a second threaded section (12) with opposite directions of rotation. The first fixed block (2) is sleeved on the ball screw and threadedly connected to the first threaded section (11). The second fixed block (3) is sleeved on the ball screw and threadedly connected to the second threaded section (12). The housing is fixedly provided with a first guide rail that slides with the first fixed block and a second guide rail (4) that slides with the second fixed block.

2. A double-moving arc-quenching chamber based on ball screw drive according to claim 1, characterized in that: The portion of the moving contact that is fixed to the first fixed block is located on one side of the ball screw, and the portion of the stationary contact that is fixed to the second fixed block is located on the other side of the ball screw.

3. The double-acting arc-extinguishing chamber based on ball screw transmission according to claim 1, characterized in that: The drive device includes a drive motor mounted on the housing. The output shaft of the drive motor is connected to a ball screw via a coupling (9). The two ends of the ball screw are rotatably connected to the housing via bearing seats (7).

4. The double-moving arc-quenching chamber based on ball screw drive according to claim 1, characterized in that: The end of the moving contact that contacts the stationary contact, and the end of the stationary contact that contacts the moving contact, are respectively provided with a conductive plating layer.

5. The dual moving arc quenching chamber based on ball screw drive according to claim 1, characterized in that: The moving contact includes a contact body and a connecting arm fixedly connected to the contact body. The connecting arm extends from one side of the second fixing block to the first fixing block and is fixedly connected to the first fixing block.

6. A double-moving arc-quenching chamber based on ball screw drive according to claim 5, characterized in that: The first guide rail is fixed with a front limit block I and a rear limit block I arranged along the moving direction of the first fixed block. The distance between the front limit block I and the rear limit block I is adapted to the maximum stroke of the first fixed block.

7. The dual moving arc quenching chamber based on ball screw drive according to claim 5, characterized in that: The second guide rail is fixed with a front limit block II and a rear limit block II (41) arranged along the moving direction of the second fixed block. The distance between the front limit block II and the rear limit block II is adapted to the maximum stroke of the second fixed block (3).

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