Circuit breaker tripping device and switchgear

Abstract

The present disclosure discloses a tripping device and a switchgear for a circuit breaker, wherein the switchgear includes the tripping device of the circuit breaker. The tripping device of the circuit breaker includes a fixed support, a drive assembly, a tripping crank arm and an external input plate. The fixed support is fixed to the bottom plate of the circuit breaker mechanism chamber, and the circuit breaker mechanism chamber is located on one side of the circuit breaker chassis in the cabinet of the switchgear. The drive assembly can be rotatably mounted on the fixed support. The tripping crank arm is sleeved and fixed to the tripping half-axis of the circuit breaker. One end of the external input plate penetrates into the bottom plate of the circuit breaker mechanism chamber and is movably connected to the fixed support, and the other end penetrates out of the cabinet for external operation. Under the action of external force, the external input plate pushes the drive assembly to rotate around the fixed support toward the tripping crank arm. When the drive assembly rotates to contact the tripping crank arm, it pushes the tripping crank arm to rotate to drive the tripping half-axis to rotate in the tripping direction, thereby realizing the tripping of the circuit breaker.

Description

Technical Field

[0001] The present disclosure relates to the field of power equipment, and in particular to a tripping device and a switchgear for a circuit breaker. Background Art

[0002] Switchgear is typically used to open and close, control, and protect electrical equipment in power systems. Switchgear typically includes a cabinet and electrical devices such as circuit breakers and earthing switches installed within the cabinet. Typically, circuit breakers are disconnected by electrical tripping. However, if there is no external secondary power supply, electrical tripping may not be possible and the circuit breaker must be manually tripped, requiring the cabinet door to be opened. This poses a safety hazard. Furthermore, in power switchgear, especially fixed switchgear, during routine maintenance and inspection door opening operations, it is also necessary to ensure that the circuit breaker is in the tripped state during the work process to ensure the safety of maintenance and inspection personnel. Summary of the Invention

[0003] In order to solve the problem in the related art that manually opening a circuit breaker requires opening a cabinet door, which poses a safety hazard, the present disclosure provides a circuit breaker opening device and a switchgear.

[0004] The present disclosure provides a circuit breaker tripping device, comprising:

[0005] A fixed support, fixed to a bottom plate of a circuit breaker mechanism chamber, wherein the circuit breaker mechanism chamber is located on one side of a circuit breaker chassis in a cabinet of the switchgear;

[0006] A driving assembly, rotatably mounted on the fixed support;

[0007] The tripping arm is mounted on and fixed to the tripping half-shaft of the circuit breaker;

[0008] An external input plate, one end of which passes through the bottom plate of the circuit breaker mechanism chamber and is movably connected to the fixed support, and the other end passes through the cabinet for external operation. Under the action of external force, the external input plate pushes the driving component to rotate around the fixed support toward the opening crank arm. When the driving component rotates to contact the opening crank arm, it pushes the opening crank arm to rotate to drive the opening semi-axis to rotate in the opening direction, thereby realizing the opening of the circuit breaker.

[0009] Optionally, the switchgear is a fixed switch cabinet, a circuit breaker operating mechanism is installed on one side of the circuit breaker chassis, and a circuit breaker body is installed on the other side of the circuit breaker.

[0010] Optionally, the tripping device further includes a driving plate, through which the external input plate is movably connected to the fixed support. The driving plate is mounted on the fixed support and can move up and down relative to the fixed support, and drives the driving assembly to rotate during the up and down movement.

[0011] Optionally, a long hole is provided on the driving plate, and a fixing pin is protruding from the fixed support, one end of the fixing pin is fixed to the fixed support, and the other end passes through the long hole, so that the driving plate is installed on the fixed support, and the outer diameter of the pin rod of the fixing pin is smaller than the width of the long hole, so that the driving plate can slide up and down relative to the fixing pin under the push of the outer input plate.

[0012] Optionally, the driving plate includes a vertical surface and a horizontal surface bent relative to the vertical surface, the lower area of ​​the vertical surface is provided with a connecting hole connected to the external input plate, and the long hole is provided on the vertical surface and spaced apart from the connecting hole.

[0013] Optionally, there are two long holes, and the two long holes are arranged along the vertical direction of the vertical surface;

[0014] A spacer sleeve is sleeved on the fixing pin, and the driving plate is sleeved on the spacer sleeve.

[0015] Optionally, a push rod is provided on the top of the horizontal surface portion, and when the driving plate moves upward, the push rod lifts the first end portion of the driving assembly to rotate the driving assembly.

[0016] Optionally, the drive assembly includes a turn pin fixed to and passing through the fixed support and a tripping drive plate installed on the turn pin and capable of rotating around the turn pin, the first end of the tripping drive plate is located above the drive plate, the second end of the tripping drive plate is located above the handle of the tripping arm, and the third end of the tripping drive plate is installed on the turn pin.

[0017] Optionally, the first end of the opening brake driving plate forms an L-shaped lifting portion, and the L-shaped lifting portion is located above the top rod of the driving plate.

[0018] Optionally, a second end portion of the opening brake drive plate is provided with an opening brake drive pin for driving the opening brake arm to rotate, and the opening brake drive pin passes through the opening brake drive plate.

[0019] Optionally, a limit arm is provided at one end of the rotation pin located on the opening drive plate, and the limit arm can rotate along with the opening drive plate;

[0020] A limit screw is provided on the fixed support, and the limit screw is located on the path of the limit arm rotating toward the opening half axis to limit the rotation stroke of the opening drive plate when resetting;

[0021] The rotation pin is located on the other end of the fixed support and is sleeved with a reset torsion spring, one end of the reset torsion spring is located below the opening drive pin, and the other end is located on the positioning pin of the fixed support;

[0022] When the external force of the external input plate is removed, the reset torsion spring drives the opening drive pin to rotate in the opposite direction of the opening. When it rotates to a predetermined angle, the limit arm is limited by the limit screw, and the opening drive plate stops rotating, thereby achieving the reset of the opening drive plate.

[0023] The present disclosure further provides a switchgear, which includes a cabinet, a circuit breaker arranged in the cabinet, and a tripping device of the circuit breaker. The circuit breaker is installed in the circuit breaker chamber of the cabinet, and the tripping half-axis of the tripping device of the circuit breaker is connected to the circuit breaker body of the circuit breaker for opening or closing the circuit breaker.

[0024] The technical solutions provided by the embodiments of the present disclosure may have the following beneficial effects:

[0025] The present invention provides a fixed support, a driving assembly and a tripping crank arm in a cabinet, wherein the fixed support is fixed to the bottom plate of the circuit breaker mechanism chamber in the cabinet, the circuit breaker mechanism chamber is located on one side of the circuit breaker chassis in the cabinet of the switchgear, the driving assembly can be rotatably mounted on the fixed support, the tripping crank arm is sleeved on and fixed to the tripping half-axis of the circuit breaker, and the external input plate passing through the cabinet body pushes the driving assembly in the cabinet body to rotate around the fixed support, so that the rotated driving assembly can contact the tripping crank arm, push the tripping crank arm to drive the tripping half-axis to rotate in the tripping direction, thereby realizing the tripping of the circuit breaker. In this way, the circuit breaker can be operated to trip outside the cabinet through the external input plate, so that the circuit breaker can be tripped without opening the cabinet door, thereby ensuring the safety of personnel.

[0026] The present disclosure provides a switchgear comprising a cabinet, a circuit breaker disposed within the cabinet, and a tripping device for the circuit breaker. The tripping half-shaft of the circuit breaker tripping device is connected to the circuit breaker body of the circuit breaker and is used to open or close the circuit breaker. Because the switchgear utilizes the tripping device, the circuit breaker can be operated from outside the cabinet via an external input panel, enabling the circuit breaker to be tripped without opening the cabinet door, thereby ensuring personnel safety.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0029] Figure 1 1 is a left side schematic diagram showing an opening device of a circuit breaker in a closed state according to an exemplary embodiment of the present disclosure.

[0030] Figure 2 1 is a schematic diagram on the right side showing an opening device of a circuit breaker in a closed state according to an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION

[0031] In order to further illustrate the principle and structure of the present disclosure, preferred embodiments of the present disclosure are now described in detail with reference to the accompanying drawings.

[0032] Combine Figure 1 and Figure 2 As shown, the present disclosure provides a tripping device 100 for a circuit breaker, which includes a fixed support 11 fixed on a bottom plate 101 of a circuit breaker mechanism chamber, a drive assembly 13, a tripping arm 15, and an external input plate 12. The circuit breaker mechanism chamber is located on one side of the circuit breaker chassis in the cabinet of the switchgear. The drive assembly 13 can be rotatably mounted on the fixed support 11, the tripping arm 15 is sleeved on and fixed to the tripping half-shaft 14 of the circuit breaker, and the external input plate 12 penetrates the cabinet and is inserted into the circuit breaker mechanism chamber. Under the action of external force, the drive assembly 13 is pushed to rotate around the fixed support 11 toward the tripping arm 15. When the drive assembly 13 rotates to contact the tripping arm 15, the tripping arm 15 is pushed to rotate to drive the tripping half-shaft 14 to rotate, thereby realizing the tripping of the circuit breaker.

[0033] The cabinet houses components such as circuit breakers and earthing switches. The cabinet has multiple functional compartments, such as a circuit breaker compartment, a low-voltage compartment, and a cable compartment. The circuit breaker is installed within the compartment. The circuit breaker can be a fixed-type circuit breaker, comprising a breaker housing, a circuit breaker operating mechanism mounted on one side of the housing, and a circuit breaker body mounted on the other side of the housing. The breaker body includes electrical components such as poles, contact arms, and plum blossom contacts. Accordingly, one side of the housing houses the breaker mechanism compartment, and a baseplate at the bottom of the compartment is used to mount the aforementioned fixed support 11.

[0034] The fixed support 11 is secured to the base plate 101 of the circuit breaker mechanism chamber via fasteners 112, such as bolts or screws. The fixed support 11 comprises a first panel 11a connected to the base plate 101, a second panel 11b extending upward from the first panel 11a, and a third panel 11c formed by bending one side of the second panel 11b toward the first panel 11a. A fixing pin 111 is provided on the third panel 11c. One end of the fixing pin 111 is fixed to the fixed support 11, and the other end extends through the third panel 11c, away from the second panel 11b. This protruding portion is provided with a spacer 111a.

[0035] One end of the external input plate 12 extends through the bottom plate 101 (i.e., into the cabinet) and is movably connected to the fixed support 11. The other end extends through the bottom plate 101 (i.e., out of the cabinet) to facilitate external operation. For example, an external driver or operator applies an upward thrust to the external input plate from outside the cabinet. Specifically, the external input plate 12 is inserted from the outside of the bottom plate of the circuit breaker mechanism chamber into the circuit breaker mechanism chamber within the cabinet.

[0036] In one embodiment, the outer input plate 12 can be directly and movably connected to the fixed support 11, for example, by being connected to the fixed support 11 through a pivot, a movable hinge or other structure, so that the outer input plate 12 can move up and down relative to the fixed support 11, so that when the outer input plate 12 moves upward and contacts the drive assembly, it can push the drive assembly 13 to rotate.

[0037] In one embodiment, if Figure 1 As shown, the tripping device 100 also includes a driving plate 18, and the external input plate 12 is movably connected to the fixed support 11 through the driving plate 18. The driving plate 18 is installed on the fixed support 11 and can move up and down relative to the fixed support 11, and push the driving assembly 13 to rotate during the up and down movement.

[0038] The drive plate 18 is provided with a long hole 181, and the other end of the fixing pin 111 passes through the long hole 181, so that the drive plate 18 is installed on the fixed support 11. The other end of the fixing pin 111 passing through the long hole 181 is provided with a pin cap. The outer diameter of the pin cap is larger than the width of the long hole 181 to prevent the drive plate 18 from sliding out. The outer diameter of the pin rod of the fixing pin 111 is smaller than the width of the long hole 181, so that the drive plate 18 can slide up and down relative to the fixing pin 111 under the push of the outer input plate 12. The length of the long hole 181 in the vertical direction is determined by the stroke required for the circuit breaker to open. Therefore, the stroke of the drive plate 18 is fixed due to the length of the long hole 181. There can be two long holes 181, and the corresponding fixed support 11 is provided with two fixing pins 111. The fixing pin 111 may be sleeved with a spacer sleeve 111 a , and the driving plate 18 is sleeved outside the spacer sleeve 111 a , so as to reduce the contact surface between the driving plate 18 and the fixing pin 111 and reduce the friction between them.

[0039] The drive plate 18 includes a vertical surface 18a and a horizontal surface 18b that bends relative to the vertical surface 18a. A connection hole for connecting to the outer input plate 12 is provided in the lower region of the vertical surface 18a. The outer input plate 12 is connected to the drive plate 18 through this connection hole. An elongated hole 181 is provided in the vertical surface 18a, spaced apart from the connection hole. Two elongated holes 181 are arranged vertically above and below the vertical surface 18a.

[0040] The horizontal surface 18b is formed by bending a portion of the edge of the vertical surface 18a, so that the vertical surface 18a and the horizontal surface 18b generally form an L-shaped structure. A top rod 182 is provided on the horizontal surface 18b.

[0041] The driving assembly 13 includes a rotation pin 13a fixed to and passing through the fixed support 11 and a brake-opening driving plate 13b mounted on the rotation pin 13a and capable of rotating around the rotation pin 13a.

[0042] The opening drive plate 13b is located on the side of the fixed support 11 that is different from the first panel 11a. Figure 2 As shown, the opening drive plate 13b has a first end 131a, a second end 131b and a third end 131c. The third end 131c is mounted on the rotation pin 13a, the first end 131a is located above the drive plate 18, and the second end 131b is located above the opening arm 15.

[0043] The first end portion 131a forms an L-shaped lifting portion, the horizontal portion of which is located above the lift rod 182 of the drive plate 18. Thus, when the outer input plate 12 pushes the drive plate 18 upward, the lift rod 182 lifts the first end portion 131a of the opening drive plate 13b, causing it to tilt upward, and the second end portion 131b moves downward and rotates toward the opening crank arm 15.

[0044] In one embodiment, after being pushed and rotated, the second end portion 131 b of the opening drive plate 13 b can directly contact the opening crank arm 15 , thereby pushing the opening crank arm 15 to rotate.

[0045] In another embodiment, a trip drive pin 13c may be further provided at the second end portion 131b of the trip drive plate 13b. The trip drive pin 13c penetrates the trip drive plate 13b, and the trip drive plate 13b drives the trip arm 15 to rotate via the trip drive pin 13c.

[0046] The tripping arm 15 is mounted on the tripping half-shaft 14 of the circuit breaker. Controlling the rotational direction of the tripping half-shaft 14 enables the circuit breaker to be opened and closed. The tripping arm 15 comprises a collar 151 and a handle 152. The collar 151 is fixedly mounted on the outer periphery of the tripping half-shaft 14, while the handle 152 faces the tripping drive plate 13b. When the tripping drive pin 13c contacts the handle 152, rotating the tripping arm 15, it drives the tripping half-shaft 14 in the opening direction, effectively opening the circuit breaker.

[0047] The rotation pin 13a passes through the second panel 11b of the fixed support 11 and the trip drive plate 13b. A limit crank arm 172 is provided at one end of the rotation pin 13a located on the trip drive plate 13b. The limit crank arm 172 can rotate with the trip drive plate 13b. The head end of the limit crank arm 172 is sleeved onto the rotation pin 13a. The protrusion of the limit crank arm 172 extends from the rotation pin 13a to the bottom of the fixed support 11, and its direction faces away from the drive plate 18. A limit screw 171 is provided on the fixed support 11. The limit screw 171 is located on the path of the limit crank arm 172 rotating toward the trip half-shaft 14, which is used to limit the rotation travel of the trip drive plate 13b when it is reset.

[0048] A return torsion spring 16 is sleeved on the other end of the rotation pin 13a located on the fixed support 11. One end of the return torsion spring 16 is located below the tripping actuation pin 13c, and the other end is positioned above a positioning pin 113 on the fixed support 11. The positioning pin 113 protrudes from the second panel 11b of the fixed support 11 and is used to position the other end of the return torsion spring 16.

[0049] When the external force of the external input plate 12 is removed, the reset torsion spring 16 drives the opening drive pin 13c to rotate in the opposite direction of the opening. When it rotates to a predetermined angle, the limit arm 172 is blocked by the limit screw 171, and the opening drive plate 13b stops rotating, so that the opening drive plate 13b returns to its initial position, thereby resetting the opening drive plate 13b. Here, the reset rotation of the opening drive plate 13b is limited by the limit screw 171, and its reset stroke is fixed, so that the opening drive plate 13b can return to its initial position. At the same time, the drive plate 18 is reset by the force of the opening drive plate 13b on the top rod 182 and the force of the gravity of the external input plate 12. Due to the limitation of the length of the long hole 181, the reset stroke of the drive plate 18 is also fixed, so it can also be reset to its initial position.

[0050] Furthermore, there is a predetermined gap between the opening driving pin 13c and the opening lever 15, so that when the manual opening function is not required, the circuit breaker maintains its original function without being affected.

[0051] When external force is applied to the external input plate 12, pushing the drive plate 18 upward, the push rod 182 on the drive plate 18 moves upward, causing the trip drive plate 13b to rotate about the rotation pin 13a. When the trip drive plate 13b rotates to a predetermined angle, the trip drive pin 13c contacts the trip arm 15, causing the trip half-shaft 14 to rotate clockwise, thereby opening the circuit breaker. At the same time, the travel of the drive plate 18 is fixed, limited by the elongated hole 181 on the drive plate 18.

[0052] When the cabinet door is opened, the outer input plate 12 is held in an elevated position by an external mechanism, so that the opening half-shaft 14 can always be in an opening state.

[0053] In this way, the outer input plate 12 drives the opening half-shaft 14 to rotate, thereby realizing the opening of the circuit breaker.

[0054] Therefore, the present invention provides a fixed support, a driving assembly and a tripping arm in the cabinet, wherein the fixed support is fixed in the cabinet, the driving assembly can be rotatably mounted on the fixed support, the tripping arm is sleeved on and fixed to the tripping half-shaft of the circuit breaker, and the external input plate passing through the cabinet body pushes the driving assembly in the cabinet body to rotate around the fixed support, so that the rotated driving assembly can contact the tripping arm, push the tripping arm to drive the tripping half-shaft to rotate in the tripping direction, thereby realizing the tripping of the circuit breaker. In this way, the circuit breaker can be operated to trip outside the cabinet through the external input plate, so that the circuit breaker can be tripped without opening the cabinet door, ensuring the safety of personnel.

[0055] Furthermore, the present disclosure also provides a switching device, including a cabinet, a circuit breaker (not shown) arranged in the cabinet, and the above-mentioned circuit breaker tripping device 100, the tripping half-axis 14 of the circuit breaker tripping device 100 is connected to the circuit breaker body of the circuit breaker for tripping the circuit breaker.

[0056] The above are only preferred feasible embodiments of the present disclosure and are not intended to limit the protection scope of the present disclosure. Any equivalent structural changes made using the contents of the present disclosure and the drawings are included in the protection scope of the present disclosure.

Claims

1. A circuit breaker tripping device, characterized in that: include: A fixed support, fixed to a bottom plate of a circuit breaker mechanism chamber, wherein the circuit breaker mechanism chamber is located on one side of a circuit breaker chassis in a cabinet of the switchgear; A driving assembly, rotatably mounted on the fixed support; The tripping arm is mounted on and fixed to the tripping half-shaft of the circuit breaker; An external input plate, one end of which penetrates the bottom plate of the circuit breaker mechanism chamber and is movably connected to the fixed support, and the other end of which penetrates the cabinet body for external operation. Under the action of external force, the external input plate pushes the driving assembly to rotate around the fixed support toward the opening crank arm. When the driving assembly rotates to contact the opening crank arm, it pushes the opening crank arm to rotate, thereby driving the opening semi-axial shaft to rotate in the opening direction, thereby realizing the opening of the circuit breaker; as well as The driving plate, the outer input plate is movably connected to the fixed support through the driving plate, the driving plate is installed on the fixed support, and can move up and down relative to the fixed support, and push the driving assembly to rotate during the up and down movement; a long hole is provided on the driving plate, and a fixing pin is protruding from the fixed support, one end of the fixing pin is fixed on the fixed support, and the other end passes through the long hole, so that the driving plate is installed on the fixed support, and the outer diameter of the pin rod of the fixing pin is smaller than the width of the long hole, so that the driving plate can slide up and down relative to the fixing pin under the push of the outer input plate; the driving plate includes a vertical surface and a horizontal surface bent relative to the vertical surface, and the lower area of ​​the vertical surface is provided with a connecting hole connected to the outer input plate, and the long hole is provided on the vertical surface and is spaced apart from the connecting hole.

2. The circuit breaker tripping device according to claim 1, characterized in that: The switchgear is a fixed switch cabinet, a circuit breaker operating mechanism is installed on one side of the circuit breaker chassis, and a circuit breaker body is installed on the other side of the circuit breaker.

3. The circuit breaker tripping device according to claim 1, characterized in that: There are two long holes, and the two long holes are arranged along the vertical direction of the vertical surface; A spacer sleeve is sleeved on the fixing pin, and the driving plate is sleeved on the spacer sleeve.

4. The circuit breaker tripping device according to claim 1, characterized in that: A push rod is provided on the top of the horizontal surface portion. When the driving plate moves upward, the push rod pushes up the first end portion of the driving assembly to rotate the driving assembly.

5. The circuit breaker tripping device according to claim 1, characterized in that: The driving assembly includes a rotating pin fixed to and passing through the fixed support and a tripping drive plate installed on the rotating pin and capable of rotating around the rotating pin. The first end of the tripping drive plate is located above the drive plate, the second end of the tripping drive plate is located above the handle of the tripping arm, and the third end of the tripping drive plate is installed on the rotating pin.

6. The circuit breaker tripping device according to claim 5, characterized in that: The first end of the opening drive plate forms an L-shaped jacking portion, and the L-shaped jacking portion is located above the top rod of the drive plate.

7. The opening device of the circuit breaker according to claim 5, characterized in that: The second end of the opening brake driving plate is provided with an opening brake driving pin for driving the opening brake arm to rotate, and the opening brake driving pin passes through the opening brake driving plate.

8. The circuit breaker tripping device according to claim 7, characterized in that: The rotation pin is located at one end of the opening drive plate and is provided with a limit arm, and the limit arm can rotate with the opening drive plate; A limit screw is provided on the fixed support, and the limit screw is located on the path of the limit arm rotating toward the opening half axis to limit the rotation stroke of the opening drive plate when resetting; The rotation pin is located on the other end of the fixed support and is sleeved with a reset torsion spring, one end of the reset torsion spring is located below the opening drive pin, and the other end is located on the positioning pin of the fixed support; When the external force of the external input plate is removed, the reset torsion spring drives the opening drive pin to rotate in the opposite direction of the opening. When it rotates to a predetermined angle, the limit arm is limited by the limit screw, and the opening drive plate stops rotating, thereby achieving the reset of the opening drive plate.

9. A switchgear, characterized in that: It comprises a cabinet, a circuit breaker arranged in the cabinet, and a tripping device of the circuit breaker according to any one of claims 1 to 8, wherein the tripping half-shaft of the tripping device of the circuit breaker is connected to the circuit breaker body of the circuit breaker for opening or closing the circuit breaker.

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