Anti-closing bounce device and vacuum circuit breaker comprising same

Abstract

The utility model provides a prevent closing bounce device and including its vacuum circuit breaker. The prevent closing bounce device includes: support, is fixed on the frame of vacuum circuit breaker and includes through -hole, guide rod, passes through the through -hole of support to extend towards the pull rod of vacuum circuit breaker, and movable in the through -hole, gyro wheel support, the first end part of guide rod near pull rod is fixedly connected, thereby more close pull rod than support, gyro wheel, rotatably installed to gyro wheel support, spring, along the axial sleeve of guide rod is connected on the outer periphery of guide rod, make gyro wheel abut on pull rod by the elastic force of spring, wherein, when the movable contact of vacuum circuit breaker closes, pull rod moves along its axial upward, and drives gyro wheel to roll, make pull rod receive the friction along its axial force.

Description

Technical Field

[0001] This utility model relates to an anti-closing bounce device and a vacuum circuit breaker including the same. Background Technology

[0002] Vacuum circuit breakers are electrical devices used to cut off the current in a part of a circuit to distribute medium and high voltage (i.e., voltages exceeding 1kV). They have advantages such as small size, light weight, and suitability for frequent operation.

[0003] The repeated bouncing of the moving contact during the closing of a vacuum circuit breaker is called closing bounce. The longer the closing bounce lasts, the longer the pre-breakdown time, and consequently the longer the ablation time, leading to a decrease in the breaking capacity and electrical life of the vacuum interrupter. To reduce closing bounce to within acceptable limits, the compression of the overtravel spring is usually adjusted, thereby changing the force applied to the moving and stationary contacts of the vacuum interrupter. However, existing methods cannot effectively solve the closing bounce problem and can also cause loosening of the pull rod in the vacuum circuit breaker's drive system. Utility Model Content

[0004] Therefore, in order to address the above problems, this utility model provides an anti-closing bounce device and a vacuum circuit breaker including the same.

[0005] This utility model provides an anti-closing bounce device, which may include: a bracket fixed to the frame of a vacuum circuit breaker and including a through hole; a guide rod extending through the through hole of the bracket toward the pull rod of the vacuum circuit breaker and movable in the through hole; a roller bracket fixedly connected to a first end of the guide rod near the pull rod, thereby being closer to the pull rod than the bracket; a roller rotatably mounted on the roller bracket; and a spring sleeved on the outer periphery of the guide rod along the axial direction, such that the roller abuts against the pull rod by means of the spring force, wherein when the moving contact of the vacuum circuit breaker closes, the pull rod moves upward along its axial direction and drives the roller to roll, so that the pull rod is subjected to frictional force along its axial direction.

[0006] In one embodiment, the bracket may further include a guide sleeve fixed to the bracket, which passes through a through-hole in the bracket and extends beyond the through-hole, such that the guide rod passes through the guide sleeve to be movable in a direction perpendicular to the axial direction of the pull rod.

[0007] In one embodiment, the spring and roller are arranged on the same side of the bracket, with one end of the spring abutting against the roller bracket and the other end of the spring abutting against the guide sleeve, so that the spring can apply a spring force to the roller bracket to press the roller against the pull rod.

[0008] In one embodiment, the roller bracket may be formed in a U-shape, including a bottom wall and two opposite side walls connected to the bottom wall, a spring abutting against the bottom wall, and a pin passing through the two opposite side walls of the roller bracket and the roller to mount the roller on the roller bracket, the roller being rotatable about the pin.

[0009] In one embodiment, the spring and the roller can be respectively disposed on opposite sides of the bracket. One end of the spring is fixed to the second end of the guide rod opposite to the first end, and the other end of the spring is fixed to the guide sleeve, so that the spring can apply elastic force to the guide rod to press the roller against the pull rod.

[0010] In one embodiment, the roller may abut against a portion of the outer peripheral surface near the lower end of the pull rod that extends beyond the vacuum interrupter.

[0011] In one embodiment, the outer peripheral surface of the roller may be shaped to make surface contact with the outer peripheral surface of the pull rod.

[0012] In one embodiment, the outer peripheral surface of the roller can be shaped as an arc surface that fits into contact with the outer peripheral surface of the pull rod.

[0013] In one embodiment, the bracket may be an L-shaped plate, which includes a first side plate and a second side plate. The first side plate is fixedly connected to the frame of the vacuum circuit breaker by screws, and a through hole is formed in the second side plate.

[0014] This utility model provides a vacuum circuit breaker, which may include: a pull rod that moves up and down with the moving contact and has a lower end that extends out of the vacuum interrupter chamber; and an anti-closing bounce device as described in the above embodiment, which is disposed adjacent to the lower end of the pull rod.

[0015] The advantages of this invention are that the anti-closing bounce device can be configured as a separate device independent of the vacuum circuit breaker body, achieving the function of reducing or preventing closing bounce. This anti-closing bounce device achieves excellent anti-closing bounce function through a simple and compact structure and few components, without changing the structure of the circuit breaker body or affecting its assembly. Furthermore, this anti-closing bounce device ensures that the pull rod is subjected to axial frictional force during circuit breaker closing, unaffected by installation deviations. It provides damping for the closing process of the moving contact and absorbs the closing vibration of the moving contact of the vacuum interrupter, thereby reducing or preventing closing bounce. Attached Figure Description

[0016] Figure 1 A perspective view of a vacuum circuit breaker including an anti-closing bounce device, according to an embodiment of the present invention;

[0017] Figure 2This is a partial structural diagram of a vacuum circuit breaker including an anti-closing bounce device, according to an embodiment of the present invention.

[0018] Figure 3 This is a schematic diagram of the anti-closing bounce device according to an embodiment of the present invention;

[0019] Figure 4 This is an exploded view of the anti-closing bounce device according to an embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0021] Compared to the embodiments shown in the accompanying drawings, feasible embodiments within the scope of this disclosure may have fewer components, other components not shown in the drawings, different components, components arranged differently, or components with different connections, etc. Furthermore, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0022] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Where the number of components is not specified, the number of components may be one or more; similarly, the terms “a,” “the,” “described,” and similar terms do not necessarily indicate a quantity limitation. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the word encompasses the element or object listed following the word and its equivalents, without excluding other elements or objects. The terms “install,” “set,” “connect,” or “link,” and similar terms are not limited to physical or mechanical installation, setting, or connection, but may include electrical installation, setting, or connection, whether direct or indirect. “Above,” “below,” “left,” “right,” etc., are used only to indicate the relative positional relationship of the equipment during use or the positional relationship shown in the accompanying drawings; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0023] Figure 1This is a perspective view of a vacuum circuit breaker including an anti-closing bounce device, according to an embodiment of the present invention. Figure 2 This is a partial structural diagram of a vacuum circuit breaker including an anti-closing bounce device according to an embodiment of the present invention. The anti-closing bounce device 10 of the present invention is used on circuit breakers, particularly in vacuum circuit breakers, to reduce or prevent the moving contact from bouncing during closing of the vacuum circuit breaker. Figure 1 and 2 As shown, the vacuum circuit breaker 1 may include a vacuum interrupter, a stationary contact, a moving contact, a pull rod assembly 20 for driving the moving contact, a frame 30 for supporting the vacuum interrupter and the pull rod assembly, and an anti-closing bounce device 10. The pull rod assembly 20 may include a pull rod 21, which is capable of moving up and down following the opening and closing operations of the moving contact. The pull rod 21 may have a lower end extending beyond the vacuum interrupter. The anti-closing bounce device 10 may be mounted on the frame 30 of the vacuum circuit breaker 1 and disposed adjacent to the lower end of the pull rod 21.

[0024] Figure 3 A schematic diagram of the anti-closing bounce device according to the present invention is shown. Figure 4 This is an exploded view of the anti-closing bounce device according to an embodiment of the present invention. A specific embodiment will be used for further explanation below.

[0025] refer to Figures 2 to 4In this embodiment, the anti-closing bounce device 10 may include: a bracket 100, a guide rod 200, a spring 300, a roller bracket 400, and a roller 500. Specifically, the bracket 100 may be fixed to the frame 30 of the vacuum circuit breaker 1, for example, by screws, and includes a through hole 110. For example, the bracket 100 may be an L-shaped plate, which may include a first side plate 130 and a second side plate 140. The first side plate 130 may be disposed facing the frame 30 and fixedly connected to the frame 30 by screws. The second side plate 140 may be bent from the first side plate 130 to face the pull rod 21, and the through hole 110 may be formed in the second side plate 140. The guide rod 200 may pass through the through hole 110 of the bracket 100 to extend toward the pull rod 21 of the vacuum circuit breaker 1, and the guide rod 200 is movable in the through hole 110. The roller bracket 400 can be fixedly connected to the first end 210 of the guide rod 200 near the pull rod 21, thus being closer to the pull rod 21 than the bracket 100. For example, the roller bracket 400 can be fixedly connected to the first end 210 of the guide rod 200 by using screws. The roller 500 is rotatably mounted on the roller bracket 400. The spring 300 can be sleeved on the outer periphery of the guide rod 200 along the axial direction of the guide rod 200, so that the roller 500 abuts against the pull rod 21 by the elastic force of the spring 300. When the moving contact of the vacuum circuit breaker 1 performs a closing operation, the pull rod 21 moves with the moving contact, for example, the pull rod 21 moves upward along its axial direction, thereby causing the roller 500 abutting against it to roll. Due to the relative movement between the pull rod 21 and the roller 500, the pull rod 21 is subjected to a frictional force along its axial direction. This frictional force can dampen the closing process of the moving contact, absorb the closing vibration of the moving contact in the vacuum interrupter, and thus reduce closing bounce.

[0026] According to one embodiment of the present invention, the bracket 100 may further include a guide sleeve 120 fixed to the bracket 100, which passes through the through hole 110 of the bracket 100 and extends out of the through hole 110. For example, the guide sleeve 120 may be welded to the through hole 110 of the bracket 100, such that one end of the guide sleeve 120 inserted into the through hole 110 is flush with the surface of the bracket 100, while the other end extends out of the through hole 110, for example, protruding out of the bracket 100 in a direction away from the pull rod 21. The guide rod 200 can pass through the through hole 110 by passing through the guide sleeve 120. Due to the limiting effect of the guide sleeve 120 on the guide rod 200, the guide rod 200 can move in a direction toward the pull rod 21, for example, it can move in a direction perpendicular to the axial direction of the pull rod 21. For example, the inner diameter of the guide sleeve 120 is approximately equal to the outer diameter of the guide rod 200, allowing the guide rod 200 to move only within the guide sleeve 120 along the axial direction perpendicular to the pull rod 21, without wobbling in other directions. Therefore, by providing the guide sleeve 120 on the bracket 100, the guide rod 200 can be better limited, facilitating its movement along the axial direction perpendicular to the pull rod without wobbling in other directions. This, in turn, facilitates the application of pressure to the pull rod 21 via the roller 500, providing a damping effect when the pull rod moves upward.

[0027] According to one embodiment of the present invention, the spring 300 and the roller 500 can be disposed on the same side of the bracket 100, for example, as shown below. Figure 2 As shown, it can be positioned on the left side of the bracket 100, that is, closer to the pull rod 21. The spring 300 is sleeved on the outer periphery of the guide rod 200, with one end abutting against the roller bracket 400 and the other end abutting against the bracket 100, for example, against the guide sleeve 120 in the bracket 100. At this time, the spring 300 is sandwiched between the roller bracket 400 and the bracket 100 and is compressed. Thus, the compressed spring 300 can apply a spring force to the roller bracket 400 to press the roller 500 on the roller bracket 400 against the pull rod 21. Since the spring 300 is sleeved on the outer periphery of the guide rod 200, the spring 300 can apply a spring force (i.e., the normal force of the pull rod) in a direction perpendicular to the axial direction of the pull rod to press the roller 500 against the pull rod 21, thereby ensuring that the pull rod can be subjected to the frictional force along its axial direction generated by the above-mentioned normal force when the vacuum circuit breaker is closed, thereby reducing the closing bounce.

[0028] According to one embodiment of the present invention, such as Figure 3 and 4As shown, the roller bracket 400 can be U-shaped and may include a bottom wall 410 and two opposing side walls 420 connected to the bottom wall 410. A screw can pass through a through hole in the bottom wall 410 and be fixedly connected to the first end 210 of the guide rod 200 to securely connect the bottom wall 410 to the first end 210 of the guide rod 200. At this time, the spring 300 can abut against the bottom wall 410 to apply a spring force to the bottom wall 410. A pin 700 passes through the two opposing side walls 420 of the roller bracket 400 and the roller 500 to mount the roller 500 onto the roller bracket 400. For example, the first end of the pin 700 sequentially passes through one of the two opposing side walls 420, the roller 500, and the other of the two opposing side walls 420. Then, a stop 600 can be provided on the first end of the pin 700 that extends beyond the side wall 420 to prevent the roller 500 from falling off during movement. As a result, the roller 500 can rotate around the pin 700, and the outer circumferential surface of the roller 500 contacts the pull rod 21, thereby applying a frictional force to the pull rod 21.

[0029] According to one embodiment of the present invention, the spring 300 and the roller 500 can be respectively disposed on opposite sides of the bracket 100. For example, the roller 500 can be disposed on the left side of the bracket 100, that is, on the side relatively closer to the pull rod 21, while the spring 300 can be disposed on the right side of the bracket 100, that is, on the side relatively farther away from the pull rod 21. One end of the spring 300 can be fixed to the second end 220 of the guide rod 200 opposite to the first end 210, and the other end of the spring 300 can be fixed to the guide sleeve 120 protruding from the bracket 100. At this time, the spring 300 is located between the guide sleeve 120 of the bracket 100 and the second end 220 of the guide rod 200 and is stretched. The spring 300 in the stretched state can apply elastic force to the guide rod 200, pulling the guide rod 200, the roller bracket 400 and the roller 500 together toward the pull rod 21, so that the roller 500 abuts against the pull rod 21. Therefore, the spring 300 can apply a spring force (i.e., the normal force of the pull rod) in a direction perpendicular to the axis of the pull rod to press the roller 500 against the pull rod 21, thereby ensuring that the pull rod can be subjected to the frictional force along its axis generated by the above-mentioned normal force when the vacuum circuit breaker is closed, thereby reducing the closing bounce.

[0030] According to one embodiment of the present invention, the anti-closing bounce device 10 can be installed on the frame 30 of the vacuum circuit breaker 1 at a position adjacent to the lower end of the pull rod 21. The roller 500 can abut against a portion of the outer peripheral surface of the lower end of the pull rod 21 near the vacuum interrupter chamber. In one embodiment, the outer peripheral surface of the roller 500 can be shaped to make surface contact with the outer peripheral surface of the pull rod 21, thereby facilitating the application of frictional force to the pull rod in a larger surface contact area when the pull rod moves upward due to the closing of the vacuum circuit breaker. In another embodiment, the outer peripheral surface of the roller 500 can be shaped as an arc surface capable of fitting and contacting the outer peripheral surface of the pull rod 200. This arc surface of the roller 500 enables automatic positioning and contact with the pull rod 200, and the spring force acting on the pull rod is unaffected by installation deviations. This ensures sufficient contact between the roller and the pull rod, so that the frictional force on the pull rod 200 is always along its axial direction. Based on this structure, the anti-closing bounce device can absorb the closing vibration of the moving contact of the vacuum interrupter, thereby reducing closing bounce.

[0031] The anti-closing bounce device according to embodiments of this utility model can be configured as a separate device independent of the vacuum circuit breaker body, realizing the function of reducing or preventing closing bounce. After the vacuum circuit breaker body is assembled, when it is necessary to reduce or prevent closing bounce, the anti-closing bounce device of this utility model can be installed on the frame of the vacuum circuit breaker near the lower end of the transmission rod. Furthermore, the anti-closing bounce device according to embodiments of this utility model can also be configured as part of the vacuum circuit breaker, as an anti-closing bounce module.

[0032] This invention's anti-closing bounce device achieves excellent anti-closing bounce functionality through a simple and compact structure and few components, without altering the circuit breaker's structure or affecting its assembly. Furthermore, this anti-closing bounce device ensures that the pull rod is subjected to axial frictional force during circuit breaker closing, unaffected by installation deviations. It dampens the closing process of the moving contact and absorbs the closing vibration of the moving contact in the vacuum interrupter, thereby reducing or preventing closing bounce.

[0033] While the present invention has been specifically shown and described with reference to exemplary embodiments thereof, those skilled in the art will understand that different changes in form and detail may be made without departing from the spirit and scope of the present invention as defined by the claims.

Claims

1. A device for preventing circuit breaker bounce upon closing, characterized in that, include: The bracket, fixed to the frame of the vacuum circuit breaker, includes through holes; A guide rod extends through a through-hole in the bracket toward the pull rod of the vacuum circuit breaker and is movable within the through-hole; A roller bracket is fixedly connected to the first end of the guide rod near the pull rod, thereby being closer to the pull rod than the bracket itself; The roller is rotatably mounted on the roller bracket; A spring is sleeved around the outer periphery of the guide rod along its axial direction, so that the roller abuts against the pull rod by means of the spring's elastic force. When the moving contact of the vacuum circuit breaker closes, the pull rod moves upward along its axis and drives the roller to roll, so that the pull rod is subjected to frictional force along its axis.

2. The anti-closing bounce device according to claim 1, characterized in that, The bracket also includes a guide sleeve fixed to the bracket, which passes through the through hole of the bracket and extends out of the through hole, such that the guide rod passes through the guide sleeve to be movable in a direction perpendicular to the axial direction of the pull rod.

3. The anti-closing bounce device according to claim 2, characterized in that, The spring and the roller are disposed on the same side of the bracket. One end of the spring abuts against the roller bracket, and the other end of the spring abuts against the guide sleeve, so that the spring can apply elastic force to the roller bracket to press the roller against the pull rod.

4. The anti-closing bounce device according to claim 3, characterized in that, The roller bracket is U-shaped and includes a bottom wall and two opposite side walls connected to the bottom wall. The spring abuts against the bottom wall, and a pin passes through the two opposite side walls of the roller bracket and the roller to mount the roller on the roller bracket. The roller is rotatable about the pin.

5. The anti-closing bounce device according to claim 2, characterized in that, The spring and the roller are respectively disposed on opposite sides of the bracket. One end of the spring is fixed to the second end of the guide rod opposite to the first end, and the other end of the spring is fixed to the guide sleeve, so that the spring can apply elastic force to the guide rod to press the roller against the pull rod.

6. The anti-closing bounce device according to any one of claims 1-5, characterized in that, The roller abuts against a portion of the outer peripheral surface near the lower end of the pull rod that extends outside the vacuum interrupter chamber.

7. The anti-closing bounce device according to any one of claims 1-5, characterized in that, The outer peripheral surface of the roller is shaped to make surface contact with the outer peripheral surface of the pull rod.

8. The anti-closing bounce device according to any one of claims 1-5, characterized in that, The outer circumferential surface of the roller is shaped into an arc surface that fits and contacts the outer circumferential surface of the pull rod.

9. The anti-closing bounce device according to any one of claims 1-5, characterized in that, The bracket is an L-shaped plate, which includes a first side plate and a second side plate. The first side plate is fixedly connected to the frame of the vacuum circuit breaker by screws, and the through hole is formed in the second side plate.

10. A vacuum circuit breaker, characterized in that, include: The lever moves up and down with the moving contact and has a lower end that extends beyond the vacuum interrupter. and The anti-closing bounce device as described in any one of claims 1-9 is disposed adjacent to the lower end of the pull rod.

Images