A free tripping device for a high-voltage circuit breaker mechanism

Abstract

This utility model discloses a free-tripping device for a high-voltage circuit breaker mechanism, including a manual push plate, a return spring, a pressure block, an interlocking pressure plate, and a linkage plate. One end of the return spring is fixed, and the other end is connected to the manual push plate. The pressure block is fixed to the lever shaft. One end of the linkage plate is connected to the closing drive structure, and the other end is connected to the interlocking pressure plate. The middle part of the linkage plate is rotatably connected to the second panel, and a protrusion is provided in the middle of the linkage plate. When the free-tripping device is activated, the manual push plate pushes the opening lever to rotate. After the pressure block rotates, it pushes the interlocking pressure plate to move. The interlocking pressure plate drives the linkage plate to rotate, causing the protrusion to rotate onto the closing rotation path of the closing lever, thereby inhibiting closing. This utility model is compatible with the design of existing modular mechanisms and does not affect the original function and use of the circuit breaker mechanism. Each component is set close to the circuit breaker panel, and torque is transmitted by the lever shaft, so it will not interfere with the functional structure between the two panels.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker design technology, and in particular to a free tripping device for a high-voltage circuit breaker mechanism. Background Technology

[0002] The free trip device of a circuit breaker is used to cut off the power supply in case of emergencies. It is commonly used in medium and low voltage lines, but less so in high voltage circuit breakers. High voltage circuit breakers usually have their own closing and opening switches, and their internal structure is relatively complex. With the increasing requirements for production safety, more and more customers are requesting the addition of a free trip device in high voltage circuit breakers to suppress closing.

[0003] While existing technologies have disclosed related technologies, such as the free release device disclosed in patent number CN213042857U, all components in this device are new parts, thus significantly increasing the cost. Furthermore, since this device spans between two side plates, it is prone to interfering with the original functional structure.

[0004] In addition, most existing free-release devices are mainly operated manually, or can only achieve a single operation mode of manual or automatic, and cannot combine the two.

[0005] Therefore, it is necessary to design a free tripping device suitable for high-voltage circuit breakers that requires few new parts and does not interfere with the original functional structure. Utility Model Content

[0006] To address the technical problems of existing free tripping devices, such as numerous additional parts, complex structures, and easy interference with the original functional structure, this utility model provides a free tripping device for a high-voltage circuit breaker mechanism to solve the above problems.

[0007] The technical solution adopted by this utility model to solve its technical problem is: a free tripping device for a high-voltage circuit breaker mechanism, including a manual push plate, a return spring, a pressure block, an interlocking pressure plate and a linkage plate. The manual push plate and the return spring are located on the first panel of the circuit breaker, and the pressure block and the interlocking pressure plate are located on the second panel of the circuit breaker. The manual push plate and the interlocking pressure plate are slidably arranged on the corresponding panels. One end of the return spring is fixed and the other end is connected to the manual push plate. The pressure block is fixed to the lever shaft.

[0008] One end of the linkage plate is connected to the closing drive structure, and the other end is connected to the interlocking pressure plate. The middle part of the linkage plate is rotatably connected to the second panel, and a protrusion is provided in the middle part of the linkage plate. When the free trip device is activated, the manual push plate pushes the opening paddle to rotate. After the pressure block rotates, it pushes the interlocking pressure plate to move. The interlocking pressure plate drives the linkage plate to rotate, so that the protrusion rotates to the closing rotation path of the closing paddle, thereby inhibiting closing.

[0009] In an optional embodiment of this utility model, the manual push plate is located on the surface of the first panel facing the second panel, and the manual push plate has a baffle that pushes the opening lever to rotate, the baffle extending in a direction parallel to the lever axis.

[0010] In an optional embodiment of this utility model, the pressure block and the interlocking pressure plate are located on the surface of the second panel facing away from the first panel.

[0011] In an optional embodiment of this utility model, the pressure block is sleeved on the paddle shaft, and the outer peripheral surface of the pressure block is a non-circular surface.

[0012] In an optional embodiment of this utility model, the second panel has a waist-shaped groove, and the interlocking pressure plate has a pressure column passing through the waist-shaped groove. When the free release device is activated, the pressure column contacts the linkage plate and drives the linkage plate to rotate.

[0013] In an optional embodiment of this utility model, a trip coil is further provided on the surface of the second panel facing away from the first panel. When the trip coil is activated, the output end of the trip coil drives the pressure block to rotate.

[0014] In an optional embodiment of this utility model, a transfer pressure plate is fixed on the paddle shaft located outside the pressure block. The transfer pressure plate includes a first straight plate facing the output end of the trip coil and a second straight plate extending toward the pressure block. The second straight plate is located above the end of the pressure block.

[0015] In an optional embodiment of this utility model, the manual push plate is arranged vertically on the horizontal surface with a paddle shaft, and a guide groove is provided on the manual push plate, with a guide stud passing through the guide groove and connecting to the first panel.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model is compatible with the design of existing modular mechanisms and does not affect the original function and use of the circuit breaker mechanism. Each component is set close to the circuit breaker panel and relies on the lever shaft to transmit torque, which will not interfere with the functional structure between the two panels.

[0018] (2) The reset spring and linkage plate in this utility model are the original materials of the circuit breaker. No additional mold processing is required. Only three parts need to be added: manual push plate, pressure block and interlocking pressure plate. By adding a small number of parts and borrowing a small number of existing mechanism parts, the free disengagement function is realized, which improves the standardization rate of the mechanism and reduces the cost increase caused by the increase in the use of functions.

[0019] (3) This utility model combines manual tripping and automatic tripping by adding a small number of parts, which fundamentally solves the functional requirements of mechanical and electrical combination of free tripping and meets the requirements of safe operation of high voltage circuit breakers. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a perspective view of a specific embodiment of the free tripping device of the high-voltage circuit breaker mechanism described in this utility model;

[0022] Figure 2 This is a front view of a specific embodiment of the free tripping device of the high-voltage circuit breaker mechanism described in this utility model;

[0023] Figure 3 yes Figure 2 Sectional view along axis AA;

[0024] Figure 4 yes Figure 2 BB-direction sectional view;

[0025] Figure 5 This is a schematic diagram showing the position of the linkage plate when the circuit is closed.

[0026] In the diagram, 1. Manual push plate, 101. Baffle, 2. Reset spring, 3. Pressure block, 4. Interlocking pressure plate, 401. Pressure column, 5. Linkage plate, 501. Protrusion, 6. First panel, 7. Second panel, 8. Closing lever, 9. Opening lever, 10. Lever shaft, 11. Waist-shaped groove, 12. First rotating shaft, 13. Guide slide groove, 14. Guide stud, 15. Tripping coil, 16. Transfer pressure plate, 1601. First straight plate, 1602. Second straight plate, 17. Closing drive structure. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0028] The high-voltage circuit breaker has two vertical panels. A lever shaft 10 for mounting the closing lever 8 and the opening lever 9 is connected between the two panels. The free-tripping device described in this invention is installed on these two panels. For ease of description, the two panels are named the first panel 6 and the second panel 7, respectively. The first panel 6 is located near the opening lever 9, and the second panel 7 is located near the closing lever 8. The opening lever 9 is the component within the circuit breaker that performs the opening function. In the opening function, the opening lever 9 is driven by the opening drive structure. The closing lever 8 is the component within the circuit breaker that performs the closing function. In the closing function, the closing lever 8 is driven by the closing drive structure 17. This invention does not change the original functional structure of the circuit breaker; therefore, the closing and opening functions are not described further.

[0029] This utility model discloses a free tripping device for a high-voltage circuit breaker mechanism, which will be described below with reference to specific embodiments.

[0030] Example 1

[0031] This embodiment is a manual tripping solution. For example... Figures 1-4 As shown, the circuit breaker includes a manual push plate 1, a reset spring 2, a pressure block 3, an interlocking pressure plate 4, and a linkage plate 5. The manual push plate 1 and the reset spring 2 are located on the first panel 6 of the circuit breaker, and the pressure block 3 and the interlocking pressure plate 4 are located on the second panel 7 of the circuit breaker. The manual push plate 1 and the interlocking pressure plate 4 are slidably mounted on their respective panels. One end of the reset spring 2 is fixed, and the other end is connected to the manual push plate 1. The pressure block 3 is fixed to the lever shaft 10.

[0032] One end of the linkage plate 5 is connected to the closing drive structure 17, and the other end is connected to the interlocking pressure plate 4. The middle part of the linkage plate 5 is rotatably connected to the second panel 7, and the middle part of the linkage plate 5 is provided with a protrusion 501. When the free trip device is started, the manual push plate 1 pushes the opening paddle 9 to rotate. After the pressure block 3 rotates, it pushes the interlocking pressure plate 4 to move. The interlocking pressure plate 4 drives the linkage plate 5 to rotate, so that the protrusion 501 rotates to the closing rotation path of the closing paddle 8, thereby suppressing the closing.

[0033] The manual push plate 1 is the direct action element during manual operation. The reset spring 2 is used for the automatic reset of the manual push plate 1. The linkage plate 5 and the second panel 7 are rotatably connected through the first rotating shaft 12. The protrusion 501 is used to transmit the rotational torque of the paddle shaft 10 and drive the interlocking pressure plate 4 to move through the rotation of the protrusion 501. The interlocking pressure plate 4 transmits the displacement to the linkage plate 5 on the inner side of the second panel 7, so that the linkage plate 5 rotates around the first rotating shaft 12. The linkage plate 5 is located below the closing paddle 8. When the protrusion 501 on the linkage plate 5 rotates to the closing path of the closing paddle 8, the effect of suppressing closing is achieved.

[0034] The manual push plate 1 and the return spring 2 are installed on the first panel 6, and the pressure block 3 and the interlocking pressure plate 4 are installed on the second panel 7. These four components occupy a small space between the first panel 6 and the second panel 7 and will not affect the installation and use of other functional components.

[0035] In terms of cost control, the original circuit breaker structure requires springs in several places. The reset spring 2 here can be the same model as the springs in other functional structures, without the need for separate mold making. The linkage plate 5 is also a component present in the original circuit breaker structure. The difference is that the original linkage plate 5 is only connected to the closing drive structure 17. The linkage plate 5 rotates under the driving force of the closing drive structure 17, causing the protrusion 501 to avoid the closing rotation path of the closing lever 8. After the closing drive structure 17 is released, it is reset by the spring. This invention adds the driving force of the interlocking pressure plate 4 to the original linkage plate 5, meaning that the linkage plate 5 can be driven not only by the closing drive structure 17 but also by the interlocking pressure plate 4. In the free state, the protrusion 501 of the linkage plate 5 is on the closing rotation path of the closing lever 8, i.e., it is in... Figure 4 As shown, when the free-tripping device is activated, the interlocking pressure plate 4 holds the linkage plate 5 in this position, and the closing drive structure 17 cannot drive the closing lever 8 to perform the closing operation. When the free-tripping device is closed, the pressure block 3 has no clamping force on the interlocking pressure plate 4, and the closing drive structure 17 can drive the linkage plate 5 to rotate, causing the protrusion 501 to avoid the closing rotation path of the closing lever 8, i.e. Figure 5 At the position shown, the closing operation can be completed.

[0036] In summary, this utility model only requires the addition of three parts: a manual push plate 1, a pressure block 3, and an interlocking pressure plate 4. These new parts are arranged on the inner side of the first panel 6 and the outer side of the second panel 7. The three parts occupy little space and can be installed simply by drilling holes in the first panel 6 and the second panel 7. The installation positions of the original parts do not need to be changed, and each part can perform its own function. The free-release device described in this utility model can be installed according to user needs; when this function is not required, it does not affect the normal operation of the mechanism.

[0037] This invention utilizes existing mechanism parts as much as possible, reduces the types of new parts, improves the overall standardization rate of the mechanism, and minimizes the cost increase due to the addition of functions.

[0038] The manual push plate 1 needs to push the trip lever 9 to rotate. Therefore, the manual push plate 1 is preferably located on the surface of the first panel 6 facing the second panel 7, that is, on the inner side of the first panel 6. The manual push plate 1 has a baffle 101 for pushing the trip lever 9 to rotate, and the baffle 101 extends in a direction parallel to the lever shaft 10. Figure 3As shown, when the manual push plate 1 is pushed, the baffle 101 pushes the trip lever 9 to the left, and the trip lever 9 drives the lever shaft 10 to rotate counterclockwise, thereby driving the pressure block 3 on the side of the second panel 7 to rotate.

[0039] For the assembly of the manual push plate 1: the manual push plate 1 is preferably arranged vertically to the paddle shaft 10 within a horizontal surface. The manual push plate 1 is provided with a guide groove 13, and a guide stud 14 passes through the guide groove 13 to connect with the first panel 6. The manual push plate 1 can reciprocate relative to the guide stud 14 along the guide groove 13. Since the guide groove 13 is located on the manual push plate 1, only mounting holes need to be machined on the first panel 6, resulting in less modification to the original circuit breaker structure. Similarly, when installing the interlocking pressure plate 4, a guide groove 13 is also provided on the interlocking pressure plate 4, and the guide stud 14 passes through the guide groove 13 on the interlocking pressure plate 4 to connect with the second panel 7.

[0040] The pressure block 3 and the interlocking pressure plate 4 can be located inside or outside the second panel 7. To avoid occupying the inner space of the paddle shaft 10, it is preferable that the pressure block 3 and the interlocking pressure plate 4 are located on the surface of the second panel 7 facing away from the first panel 6. In a further design, the second panel 7 has a waist-shaped groove 11, and the interlocking pressure plate 4 has a pressure post 401 passing through the waist-shaped groove 11. When the free-release device is activated, the pressure post 401 contacts the end of the linkage plate 5 and drives the linkage plate 5 to rotate around the first rotating shaft 12. Figure 4 As shown, the pressure column 401 is located above the linkage plate 5. When the pressure column 401 moves downward, the linkage plate 5 cannot rotate counterclockwise under the restriction of the pressure column 401. The protrusion 501 is always located below the closing lever 8, which plays the role of suppressing closing.

[0041] The pressure block 3 converts the rotational motion into the translational motion of the interlocking pressure plate 4, therefore the outer circumferential surface of the pressure block 3 is a non-circular surface. For example... Figure 1 As shown, the pressure block 3 is fitted onto the paddle shaft 10, and the interlocking pressure plate 4 is located below the pressure block 3. One end of the pressure block 3 extends outward into a strip shape. When the pressure block 3 rotates, the contact surfaces of the pressure block 3 and the interlocking pressure plate 4 are at different heights, thereby realizing the up-and-down movement of the interlocking pressure plate 4.

[0042] The specific work process is as follows:

[0043] When the circuit breaker is closing or before receiving a closing signal, pushing the manual push plate 1 inward causes the tripping lever 9 to rotate counterclockwise. Simultaneously, the lever shaft 10 also rotates counterclockwise, causing the circuit breaker's closing holding system to trip. This ensures the priority execution of the tripping (opening) command, preventing the circuit breaker from closing and maintaining its open state, thus achieving manual free tripping. Because of the counterclockwise rotation of the lever shaft 10, the pressure block 3 also rotates counterclockwise, pressing the interlocking pressure plate 4 downwards, causing... Figure 5The linkage plate 5 rotates clockwise, and the limit closing lever 8 rotates counterclockwise, so that after the circuit breaker has freely tripped, it can no longer execute the closing command, and the circuit breaker remains in the open state. When the external manual free trip command (action) is cancelled, the above-mentioned moving parts return to their initial positions under the action of the return spring 2 and the spring on the lever shaft 10, and the circuit breaker returns to its normal state.

[0044] Example 2

[0045] This embodiment is a solution that combines manual tripping and electrical tripping.

[0046] Based on the structure described in the above embodiment, a trip coil 15 is also provided on the surface of the second panel 7 facing away from the first panel 6. When the trip coil 15 is activated, the output end of the trip coil 15 drives the pressure block 3 to rotate. Figure 1 and Figure 2 As shown, the trip coil 15 is installed on the outside of the second panel 7, without occupying the space of the functional structure inside the second panel 7. The electrical tripping scheme can directly use the parts from the manual tripping scheme without adding extra parts, making the free tripping operation more flexible. For high-voltage circuit breakers, remote operation is often used, so the use of the electrical tripping scheme is more important. In case of emergency power outage, manual tripping can also be used for emergency response.

[0047] In a further design, since the thickness of the pressure block 3 is small and the size of the trip coil 15 is large, the output shaft of the trip coil 15 may not be able to contact the pressure block 3. Therefore, in this embodiment, a transfer pressure plate 16 is fixed on the paddle shaft 10 located outside the pressure block 3. The transfer pressure plate 16 includes a first straight plate 1601 facing the output end of the trip coil 15 and a second straight plate 1602 extending toward the pressure block 3. The second straight plate 1602 is located above the end of the pressure block 3.

[0048] The specific working process of electrical tripping is as follows:

[0049] When the circuit breaker is closing or before receiving a closing signal, the trip coil 15 receives a free trip command. The output shaft of the trip coil 15 moves downward, striking the transfer pressure plate 16, causing the lever shaft 10 to rotate counterclockwise. The opening lever 9 rotates counterclockwise, causing the circuit breaker's closing holding system to trip, ensuring the priority execution of the opening (tripping) command. The circuit breaker cannot be closed and remains in the open state, achieving the electric free trip function. Simultaneously, the pressure block 3 drives the interlocking pressure plate 4 to move downward, causing... Figure 5 When the linkage plate 5 rotates clockwise, the protrusion 501 on the top of the linkage plate 5 limits the closing lever 8 to rotate counterclockwise, so that after the circuit breaker is free-tripped, it can no longer execute the closing command, and the circuit breaker remains in the open state.

[0050] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0051] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be interpreted as indicating or implying relative importance.

[0052] In this specification, the illustrative expressions of the terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments.

[0053] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A free trip device for a high voltage circuit breaker mechanism, characterized by: It includes a manual push plate, a return spring, a pressure block, an interlocking pressure plate, and a linkage plate. The manual push plate and the return spring are located on the first panel of the circuit breaker, and the pressure block and the interlocking pressure plate are located on the second panel of the circuit breaker. The manual push plate and the interlocking pressure plate are slidably mounted on their respective panels. One end of the return spring is fixed, and the other end is connected to the manual push plate. The pressure block is fixed to the lever shaft. One end of the linkage plate is connected to the closing drive structure, and the other end is connected to the interlocking pressure plate. The middle part of the linkage plate is rotatably connected to the second panel, and a protrusion is provided in the middle part of the linkage plate. When the free trip device is activated, the manual push plate pushes the opening paddle to rotate. After the pressure block rotates, it pushes the interlocking pressure plate to move. The interlocking pressure plate drives the linkage plate to rotate, so that the protrusion rotates to the closing rotation path of the closing paddle, thereby inhibiting closing.

2. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized in that: The manual push plate is located on the surface of the first panel facing the second panel. The manual push plate has a baffle that pushes the opening lever to rotate, and the baffle extends in a direction parallel to the lever axis.

3. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized in that: The pressure block and interlocking pressure plate are located on the surface of the second panel facing away from the first panel.

4. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized in that: The pressure block is fitted onto the paddle shaft, and the outer circumferential surface of the pressure block is a non-circular surface.

5. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized by: The second panel has a waist-shaped groove, and the interlocking pressure plate has a pressure column passing through the waist-shaped groove. When the free release device is activated, the pressure column contacts the interlocking plate and drives the interlocking plate to rotate.

6. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized by: A trip coil is also provided on the surface of the second panel facing away from the first panel. When the trip coil is activated, the output end of the trip coil drives the pressure block to rotate.

7. The free trip unit of a high voltage circuit breaker mechanism according to claim 6, characterized by: A transfer pressure plate is fixed on the paddle shaft located outside the pressure block. The transfer pressure plate includes a first straight plate facing the output end of the trip coil and a second straight plate extending toward the pressure block. The second straight plate is located above the end of the pressure block.

8. The free trip unit of a high voltage circuit breaker mechanism according to claim 1, characterized by: The manual push plate is arranged vertically on the paddle shaft within the horizontal surface. The manual push plate is provided with a guide groove, and the guide stud passes through the guide groove and connects to the first panel.

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