Manual switching device for circuit breaker and circuit breaker for closing resistance detection

Abstract

The application relates to a circuit breaker manual opening and closing device for closing resistance detection and a circuit breaker, wherein the circuit breaker manual opening and closing device comprises two door frame connecting plates for being installed on the door frame of the circuit breaker; a reducer mounting seat is installed on the door frame connecting plate; a reducer with a self-locking function is installed on the reducer mounting seat; the reducer is provided with an output end and an input end; a transmission shaft is connected to the output end; an outer crank arm connecting seat for driving the outer crank arm of the arc extinguishing chamber of the circuit breaker is connected to the end of the transmission shaft; one of the door frame connecting plate and the reducer mounting seat is provided with a first long hole, and the other is provided with a second long hole; the first long hole is perpendicular to the second long hole; a connecting bolt is arranged to fix two corresponding components among the door frame, the door frame connecting plate and the reducer mounting seat and adjust the horizontal and vertical positions of the transmission shaft, so that the transmission shaft is aligned with the swing axis of the outer crank arm.

Description

Technical Field

[0001] This invention relates to the field of resistance value detection of circuit breaker closing resistor, and specifically to a device for manually opening and closing circuit breakers. Background Technology

[0002] The closing resistor in the arc-extinguishing chamber of a circuit breaker suppresses overvoltage generated when the resistive moving contact and resistive stationary contact of the main circuit in the arc-extinguishing chamber close. With prolonged operation, the resistance value may change significantly, potentially failing to meet the requirement that "the closing resistance value should not exceed ±5% of the factory value" during power grid operation. Therefore, it is necessary to measure the closing resistor value during circuit breaker use to ensure that the resistance value meets the requirements. During testing, the closing resistor circuit must be in the connected state while the main circuit is in the disconnected state.

[0003] Currently, the power grid has increasingly stringent requirements for the testing of operating power plants, necessitating the testing of the closing resistance of circuit breakers in a non-disassembled state according to power grid equipment technical standards. Therefore, it is essential to design a device for testing the closing resistance value in a non-disassembled state.

[0004] Since the main circuit of the circuit breaker needs to be grounded at both ends, the closing resistance can be measured with a multimeter using the grounding switches on both sides of the circuit breaker, achieving testing without disassembly. The operating mechanism drives the resistor circuit and the main circuit to connect sequentially. Under the drive of the operating mechanism, the resistor circuit connects before the main circuit. Therefore, as long as the driving mechanism stops driving the main circuit after connecting the resistor circuit, the operator can indirectly measure the closing resistance in the closed state by measuring the grounding switches on both sides of the circuit breaker. However, the resistor circuit and the main circuit in the circuit breaker use the same operating mechanism. While the operating mechanism is driving the resistor circuit to connect, it also drives the main circuit to connect. Since the operating mechanism cannot stop at the position between opening and closing, the normal operation of the operating mechanism cannot achieve the state where the closing resistor makes electrical contact while the main contacts are not in contact.

[0005] The current arc-extinguishing chamber has a crank arm box on its moving end. The crank arm box has an external crank arm for transmission connection with the operating mechanism. If manual operation of the external crank arm is considered to achieve manual closing, manual operation is not possible due to friction on the transmission path and large insertion force of the closing resistor contacts. Furthermore, when the moving contact of the closing resistor contacts the stationary contact of the closing resistor, the closing spring on the stationary contact of the closing resistor will have a rebound force, making it difficult to maintain an accurate closing resistor detection position. Summary of the Invention

[0006] The purpose of this invention is to provide a manual opening and closing device for circuit breakers for detecting closing resistance, thereby solving the technical problems in the prior art where the outer crank arm cannot be manually driven and the closing resistance detection position is difficult to maintain during closing resistance detection. This invention also provides a circuit breaker to solve the technical problems in the prior art where the outer crank arm cannot be manually driven and the closing resistance detection position is difficult to maintain during closing resistance detection.

[0007] To achieve the above objectives, the technical solution of the circuit breaker manual opening and closing device for detecting closing resistance provided by the present invention is as follows: The circuit breaker manual opening and closing device for detecting closing resistance includes two door frame connecting plates for installation on the door frame of the circuit breaker. A reducer mounting base is installed on the door frame connecting plates, and a reducer with a self-locking function is installed on the reducer mounting base. The reducer has an output end and an input end. The output end is connected to a drive shaft, and the end of the drive shaft is connected to an outer crank arm connecting base for driving the outer crank arm of the circuit breaker's arc-extinguishing chamber. The door frame connecting plates and the reducer mounting base... One of the mounting bases has a first elongated hole and the other has a second elongated hole, and / or, one of the door frame connecting plates and the door frame has a first elongated hole and the other has a second elongated hole, and / or, the part of the door frame connecting plate used for connecting with the reducer mounting base has a first elongated hole and the part used for connecting with the door frame has a second elongated hole. The first elongated hole and the second elongated hole are perpendicular to each other, allowing connecting bolts to pass through to fix two corresponding components in the door frame, the door frame connecting plate and the reducer mounting base and to adjust the horizontal and vertical positions of the drive shaft so that the drive shaft is aligned with the swing axis of the outer crank arm.

[0008] The beneficial effects are as follows: The manual opening and closing device for circuit breaker used for closing resistance detection provided by this invention mounts a self-locking reducer on the door frame connecting plate via a reducer mounting base. This allows for relative fixation between the reducer and the door frame connecting plate, facilitating stable torque output from the reducer. The transmission shaft configuration increases the lever arm for driving the outer crank arm, reducing the driving force required to drive the outer crank arm. Operation is simple. The reducer's self-locking function prevents rebound after the closing resistance is closed, improving the efficiency of closing resistance detection and keeping the closing resistance in the closed position. The alignment of the transmission shaft's axial direction with the swing axis of the outer crank arm maximizes the lever arm between the reducer's output end and the outer crank arm, improving torque transmission efficiency between the reducer's output end and the outer crank arm. Compared with existing technologies, this invention allows the main circuit to be disconnected while the resistance circuit in the arc-extinguishing chamber is connected, thus meeting the state requirements for detecting the closing resistance value.

[0009] As a further improvement, the outer crank arm connecting seat is a U-shaped structure, including a base plate and side plates disposed on both sides of the base plate, for fastening onto the outer crank arm in a manner where the base plate is perpendicular to the swing axis of the outer crank arm, and the side plates are used to snap onto both sides of the swing direction of the outer crank arm.

[0010] The beneficial effects are: the outer crank arm connector is connected to the outer crank arm in a snap-fit ​​manner, which is convenient and also helps to reduce the weight of the outer crank arm connector, thus saving production costs.

[0011] As a further improvement, the outer crank arm connector is provided with a fixing arm, which is used to connect with the outer crank arm screw.

[0012] The beneficial effect is that the outer crank arm connector is connected to the outer crank arm through the fixed arm, which helps to improve the connection strength between the outer crank arm connector and the outer crank arm.

[0013] As a further improvement, the drive shaft is a telescopic structure used to adjust the distance between the output end of the reducer and the outer crank arm connecting seat to accommodate assembly errors.

[0014] The beneficial effects are: the telescopic transmission makes the distance between the reducer output end and the outer crank arm connecting seat adjustable, which can not only adapt to assembly errors, but also make the device adaptable to the door frame of circuit breakers and the outer crank arm of arc extinguisher with different spacing, which helps to improve the applicability of the device.

[0015] As a further improvement, the drive shaft includes a shaft body and a bushing. The bushing is connected to the output end of the reducer. The shaft body is slidably mounted in the bushing along the axial direction and is limited in the bushing along the circumferential direction. The end of the shaft body extending out of the bushing is connected to the outer crank arm connecting seat.

[0016] The beneficial effects are: the transmission consists of a bushing and a shaft body, which has a simple structure and is easy to manufacture.

[0017] As a further improvement, both door frame connecting plates are provided with two rows of L-shaped fixing holes. The vertically arranged fixing holes are used to fix the door frame connecting plate to the side door frame of the circuit breaker, and the horizontally arranged fixing holes are used to fix the door frame connecting plate to the bottom door frame of the circuit breaker.

[0018] The beneficial effects are: the door frame connecting plate is fixedly connected to the side door frame and bottom door frame of the circuit breaker, which helps to improve the connection strength between the door frame connecting plate and the door frame of the circuit breaker, helps to prevent the door frame from falling off, and thus helps to ensure stable opening and closing of the circuit breaker by maintaining the closing resistance.

[0019] As a further improvement, the reducer mounting base includes a transverse connecting plate for connecting with the door frame connecting plate, and a stiffening plate perpendicular to the plane of the transverse connecting plate.

[0020] The beneficial effects are: the addition of stiffeners helps to increase the overall strength of the reducer mounting base, which helps to improve the stability of the reducer, and thus helps to ensure the stability of the closing resistor during opening and closing.

[0021] The technical solution of the circuit breaker provided by this invention is as follows: The circuit breaker includes an arc-extinguishing chamber, within which a closing resistor circuit is provided. An external crank arm is provided outside the arc-extinguishing resistor to drive the closing resistor circuit to close. The circuit breaker also includes a manual opening and closing device for driving the external crank arm. The manual opening and closing device includes two door frame connecting plates for mounting on the door frame of the circuit breaker. A reducer mounting base is mounted on the door frame connecting plates. A reducer with a self-locking function is mounted on the reducer mounting base. The reducer has an output end and an input end. The output end is connected to a drive shaft, and the end of the drive shaft is connected to an external crank arm for driving the arc-extinguishing chamber of the circuit breaker. The outer crank arm connecting seat for crank arm movement; one of the door frame connecting plate and the reducer mounting seat is provided with a first elongated hole and the other is provided with a second elongated hole, and / or, one of the door frame connecting plate and the door frame is provided with a first elongated hole and the other is provided with a second elongated hole, and / or, the part of the door frame connecting plate used for connecting with the reducer mounting seat is provided with a first elongated hole and the part used for connecting with the door frame is provided with a second elongated hole, the first elongated hole and the second elongated hole are perpendicular to each other, so that connecting bolts can pass through to fix two corresponding components in the door frame, the door frame connecting plate and the reducer mounting seat and adjust the horizontal and vertical positions of the drive shaft so that the drive shaft is aligned with the swing axis of the outer crank arm.

[0022] The beneficial effects are as follows: The circuit breaker provided by this invention mounts a self-locking reducer on the door frame connecting plate via a reducer mounting base, which can achieve relative fixation between the reducer and the door frame connecting plate. This facilitates stable torque output from the reducer. The transmission shaft configuration increases the lever arm for driving the outer crank arm, reducing the driving force required to drive the outer crank arm. Operation is simple. The self-locking function of the reducer prevents rebound after the closing resistor is closed, which improves the efficiency of closing resistor detection and keeps the closing resistor in the closed position. The axial direction of the transmission shaft is aligned with the swing axis of the outer crank arm, which maximizes the lever arm between the reducer output end and the outer crank arm, improving the torque transmission efficiency between the reducer output end and the outer crank arm. Compared with the prior art, this invention allows the main circuit to be disconnected while the resistance circuit in the arc-extinguishing chamber is connected, thus meeting the state requirements for detecting the closing resistor value.

[0023] As a further improvement, the outer crank arm connecting seat is a U-shaped structure, including a base plate and side plates disposed on both sides of the base plate, for fastening onto the outer crank arm in a manner where the base plate is perpendicular to the swing axis of the outer crank arm, and the side plates are used to snap onto both sides of the swing direction of the outer crank arm.

[0024] The beneficial effects are: the outer crank arm connector is connected to the outer crank arm in a snap-fit ​​manner, which is convenient and also helps to reduce the weight of the outer crank arm connector, thus saving production costs.

[0025] As a further improvement, the outer crank arm connector is provided with a fixing arm, which is used to connect with the outer crank arm screw.

[0026] The beneficial effect is that the outer crank arm connector is connected to the outer crank arm through the fixed arm, which helps to improve the connection strength between the outer crank arm connector and the outer crank arm.

[0027] As a further improvement, the drive shaft is a telescopic structure used to adjust the distance between the output end of the reducer and the outer crank arm connecting seat to accommodate assembly errors.

[0028] The beneficial effects are: the telescopic transmission makes the distance between the reducer output end and the outer crank arm connecting seat adjustable, which can not only adapt to assembly errors, but also make the device adaptable to the door frame of circuit breakers and the outer crank arm of arc extinguisher with different spacing, which helps to improve the applicability of the device.

[0029] As a further improvement, the drive shaft includes a shaft body and a bushing. The bushing is connected to the output end of the reducer. The shaft body is slidably mounted in the bushing along the axial direction and is limited in the bushing along the circumferential direction. The end of the shaft body extending out of the bushing is connected to the outer crank arm connecting seat.

[0030] The beneficial effects are: the transmission consists of a bushing and a shaft body, which has a simple structure and is easy to manufacture.

[0031] As a further improvement, both door frame connecting plates are provided with two rows of L-shaped fixing holes. The vertically arranged fixing holes are used to fix the door frame connecting plate to the side door frame of the circuit breaker, and the horizontally arranged fixing holes are used to fix the door frame connecting plate to the bottom door frame of the circuit breaker.

[0032] The beneficial effects are: the door frame connecting plate is fixedly connected to the side door frame and bottom door frame of the circuit breaker, which helps to improve the connection strength between the door frame connecting plate and the door frame of the circuit breaker, helps to prevent the door frame from falling off, and thus helps to ensure stable opening and closing of the circuit breaker by maintaining the closing resistance.

[0033] As a further improvement, the reducer mounting base includes a transverse connecting plate for connecting with the door frame connecting plate, and a stiffening plate perpendicular to the plane of the transverse connecting plate.

[0034] The beneficial effects are: the addition of stiffeners helps to increase the overall strength of the reducer mounting base, which helps to improve the stability of the reducer, and thus helps to ensure the stability of the closing resistor during opening and closing.

[0035] As a further improvement, the outer crank arm is a plate-shaped structure, and the outer crank arm is provided with a snap-fit ​​surface on both sides of its own swing direction for the outer crank arm connecting seat in the manual opening and closing device of the circuit breaker to snap into.

[0036] The beneficial effects are: the plate-shaped outer crank arm is easy to manufacture and form, which helps to reduce manufacturing costs; and the mating structure between the outer crank arm and the outer crank arm connecting seat is planar, which helps to increase the contact area between the outer crank arm connecting seat and the outer crank arm, thereby helping to improve the connection strength between the two.

[0037] As a further improvement, the outer crank arm is provided with a pivot hole for rotating and fitting onto the arc-extinguishing chamber. A groove is provided on one side of the pivot hole on the outer crank arm, which divides the outer crank arm on one side of the pivot hole into two clamping plates. One clamping plate is provided with a light hole, and the other clamping plate is provided with a threaded hole. The light hole and the threaded hole are connected to each other.

[0038] The beneficial effects are: when the two clamping plates are separated, it is beneficial to appropriately enlarge the size of the rotating shaft hole to match the rotating shaft on the arc-extinguishing chamber, which is beneficial to improve the applicability of the outer crank arm connecting seat. Furthermore, the smooth hole and threaded hole can be used to pass through the fixing arm and the connecting screw of the outer crank arm connecting seat, which is beneficial to simplify the structure. Attached Figure Description

[0039] Figure 1 A schematic diagram of the structure of a manual circuit breaker opening and closing device according to an embodiment of the circuit breaker provided by the present invention;

[0040] Figure 2 for Figure 1 Top view;

[0041] Figure 3 This is a structural schematic diagram of the door frame of a circuit breaker.

[0042] Figure 4 This is a schematic diagram of the outer crank arm of a circuit breaker;

[0043] Figure 5 for Figure 2 Schematic diagram of the structure of the connecting seat for the inner and outer crank arms;

[0044] Figure 6 This is a schematic diagram of the assembly of the outer crank arm connecting seat and the outer crank arm;

[0045] Figure 7 for Figure 2 A schematic diagram of the drive shaft.

[0046] Explanation of reference numerals in the attached drawings: 1. Door frame connecting plate; 2. Horizontal elongated hole; 3. Vertical elongated hole; 4. Reducer mounting base; 5. Door frame connecting part; 6. Mounting base connecting part; 7. Output end; 8. Handle; 9. Reducer; 10. Drive shaft; 11. Outer crank arm connecting base; 12. Outer crank arm; 13. Rotary shaft hole; 14. Groove; 15. Threaded hole; 16. Smooth hole; 17. Clamping plate; 18. Side plate; 19. Base plate; 20. Fixed arm; 21. Slot hole; 22. Shaft body; 23. Bushing; 24. Fixed groove; 25. Square hole; 26. Door frame; 27. Side door frame; 28. Bottom door frame; 29. ​​Rib plate; 30. Horizontal connecting plate; 31. Snap-fit ​​plane. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0048] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0049] It should be noted that, in specific embodiments of the present invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply such an actual relationship or order between these entities or operations. Furthermore, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, the use of phrases such as "comprising a…" to define an element does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0050] In the description of this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0051] In the description of this invention, unless otherwise explicitly specified and limited, the term "provided with" should be interpreted broadly. For example, the object "provided with" can be a part of the body, or it can be separately arranged from the body and connected to the body. This connection can be a detachable connection or a non-detachable connection. Those skilled in the art can understand the specific meaning of the above terms in this invention through specific circumstances.

[0052] The present invention will be further described in detail below with reference to the embodiments.

[0053] Embodiment 1 of the circuit breaker provided in this invention:

[0054] The circuit breaker includes an arc-extinguishing chamber and a manual circuit breaker opening and closing device. The arc-extinguishing chamber is equipped with a closing resistor circuit, and an outer crank arm 12 is provided outside the arc-extinguishing resistor to drive the closing resistor circuit to be connected. The manual circuit breaker opening and closing device is used to drive the outer crank arm 12 to move, thereby driving the closing resistor circuit to be connected.

[0055] like Figure 4 As shown, the outer crank arm 12 is a plate-like structure with flat sides serving as snap-fit ​​surfaces 31 for cooperation with the manual opening and closing device. The outer crank arm 12 has a pivot hole 13 for mounting onto a pivot on the outer wall of the arc-extinguishing chamber. A groove 14 is provided on one side of the pivot hole 13, dividing the outer crank arm 12 into two clamping plates 17. These clamping plates 17 have a clearance to allow for mutual separation, thus appropriately enlarging the size of the pivot hole 13. One of the clamping plates 17 on the outer crank arm 12 is provided with a threaded hole 15, and the other clamping plate 17 is provided with a clear hole 16 corresponding to the threaded hole 15. Through-hole fastening screws are installed, allowing the two clamping plates 17 to clamp the pivot on the arc-extinguishing chamber.

[0056] like Figure 1 and Figure 2As shown, the circuit breaker manual opening and closing device includes a door frame connecting plate 1, a reducer mounting base 4, and a reducer 9 mounted on the reducer mounting base 4. The output end 7 of the reducer 9 is connected to an outer crank arm connecting base 11 via a transmission shaft 10. The outer crank arm connecting base 11 is used to connect to an outer crank arm 12. Under the drive of the reducer 9, the outer crank arm connecting base 11 drives the outer crank arm 12 to move so that the closing resistor in the arc extinguishing chamber closes.

[0057] Two door frame connecting plates 1 are provided, and the two door frame connecting plates 1 have identical structures. Each door frame connecting plate 1 has a door frame connecting part 5, which has two rows of fixing holes arranged vertically and horizontally in an L-shape. The vertically arranged fixing holes correspond to the connecting holes on the side door frame 27 of the circuit breaker, and the horizontally arranged fixing holes correspond to the connecting holes on the bottom door frame 28. During connection, fastening screws are inserted through the corresponding fixing holes and connecting holes to connect the door frame connecting plate 1 to the door frame 26 of the circuit breaker. Figure 3 As shown, the side door frame 27 and the bottom door frame 28 together form the door frame 26 of the circuit breaker. The part of the door frame connecting part 5 surrounded by the vertically arranged fixing holes and the two horizontally arranged fixing holes forms the mounting base connecting part 6. The mounting base connecting part 6 is provided with a horizontal elongated hole 2 extending in the vertical direction and located in the plane of the door frame 26 of the circuit breaker. The horizontal elongated hole 2 serves as the first elongated hole for the reducer mounting base 4 to be connected.

[0058] The reducer mounting base 4 is a plate-like structure, including a horizontal connecting plate 30 on which the reducer 9 is mounted. Vertical elongated holes 3 are provided on both the left and right sides of the horizontal connecting plate 30 on the reducer mounting base 4. These vertical elongated holes 3 serve as secondary elongated holes, and their positions correspond to the positions of the horizontal elongated holes 2 on the two door frame connecting plates 1. The reducer mounting base 4 can be fixed to the two door frame connecting plates 1 by inserting fastening screws through the horizontal elongated holes 2 and vertical elongated holes 3. Furthermore, because the diameter of the fastening screws is small, the vertical elongated holes 3 provide vertical movement space for the screws, allowing the reducer mounting base 4 to be adjusted vertically relative to the door frame connecting plates 1. The horizontal elongated holes 2 provide horizontal movement space for the screws, allowing the reducer mounting base 4 to be adjusted horizontally relative to the door frame connecting plates 1.

[0059] The transverse connecting plate 30 of the reducer mounting base 4 is also provided with multiple stiffening plates 29 arranged at intervals along the transverse direction. The plane of each stiffening plate 29 is perpendicular to the plane of the door frame connecting plate 1, which is used to increase the overall structural strength of the reducer mounting base 4.

[0060] like Figure 5As shown, the outer crank arm connecting seat 11 has a U-shaped structure. The outer crank arm connecting seat 11 includes two side plates 18 arranged at intervals, a base plate 19, and a fixing arm 20. The roots of the two side plates 18 are connected together through the base plate 19. The specific shape of the two side plates 18 is adapted to the shape of the snapping plane 31 of the outer crank arm 12. The interval between the two side plates 18 is adapted to the size of the outer crank arm 12 so that the two side plates 18 can clamp the outer crank arm 12.

[0061] The fixed arm 20 has an L-shaped structure and is located beside the base plate 19, parallel to the side plate 18, for connection with the outer crank arm 12. Specifically, as shown... Figure 6 As shown, the fixed arm 20 is provided with screw holes. During connection, the fastening screws are passed through the screw holes, the smooth hole 16 and the threaded hole 15 on the fixed arm 20 in sequence. With the fastening screws tightened, the outer crank arm connecting seat 11 is fixed on the outer crank arm 12.

[0062] like Figure 7 As shown, the drive shaft 10 includes a shaft body 22 and a bushing 23. The shaft body 22 is a square shaft, and one end of the shaft body 22 near the outer crank arm connecting seat 11 is used to connect to the outer crank arm connecting seat 11. Specifically, the end of the shaft body 22 is provided with a fixing groove 24, and the center of the bottom plate 19 of the outer crank arm connecting seat 11 is provided with a square hole 25. The corners of the bottom plate 19 and the two side plates 18 of the outer crank arm connecting seat 11 are provided with L-shaped slots 21. The bottom wall of the slot 21 is provided with screw holes that communicate with the square holes 25. By inserting fastening screws through the screw holes, the fastening screws are pressed tightly against the bottom of the fixing groove 24 on the shaft body 22 to connect the shaft body 22 to the outer crank arm 12.

[0063] The bushing 23 has a square cylindrical structure. The end of the bushing 23 facing away from the outer crank arm connecting seat 11 has a flat keyway for keyed connection with the output end 7 of the reducer 9. One end of the shaft body 22 facing away from the outer crank arm connecting seat 11 is inserted into the bushing 23 and can slide within the bushing 23 to adjust the distance between the reducer output end 7 and the outer crank arm connecting seat 11. The bushing 23 has screw holes for screwing screws into after the shaft body 22 has slid to a suitable position within the bushing 23. The end of the screw presses tightly against the outer circumferential surface of the shaft body 22 to axially limit its movement.

[0064] The reducer 9 has a self-locking function. In this embodiment, the reducer 9 is a worm gear reducer. The reducer 9 has an input end and an output end 7. The output end 7 of the reducer 9 is inserted into the bushing 23 and connected to the bushing 23 by a flat key, so that the output end 7 stops rotating from the bushing 23, allowing the output end 7 of the reducer 9 to drive the bushing 23 to rotate. The input end of the reducer 9 is provided with a handle 8, which is T-shaped and includes a horizontal part and a vertical part. The vertical part is fixed to the input end of the reducer 9, and the horizontal part is operated by the operator to drive the input end of the reducer 9 to rotate. Worm gear reducers are existing technology and will not be described in detail here.

[0065] Before testing the closing resistance of the circuit breaker, first fix the outer crank arm connecting seat 11 to the outer crank arm 12 outside the arc extinguishing chamber of the circuit breaker, and then connect the shaft body 22 of the drive shaft 10 to the outer crank arm connecting seat 11; then install the reducer 9 on the reducer mounting seat 4, connect the bushing 23 of the drive shaft 10 to the output end 7 of the reducer 9, and fit the bushing 23 onto the shaft body 22, fix the two door frame connecting plates 1 to the two door frames 26 of the circuit breaker respectively, then adjust the relative position of the reducer mounting seat 4 and the door frame connecting plate 1 according to the actual situation, and let the bushing 23 move along the axial direction of the shaft body 22 so that the output end 7 of the reducer 9 on the reducer mounting seat 4 is aligned with the swing axis of the outer crank arm 12, and the output end 7 of the reducer 9 and the outer crank arm connecting seat 11 reach a suitable distance, then fix the reducer mounting seat 4 to the two door frame connecting plates 1, and then fix the bushing 23 to the shaft body 22.

[0066] When testing the closing resistance of the circuit breaker, the operator manually and slowly rotates handle 8. The rotating handle 8 drives the internal structure of the reducer 9 to move, transmitting torque to the output end 7 of the reducer 9. The output end 7 of the reducer 9 drives the bushing 23 to drive the shaft body 22, which in turn drives the outer crank arm connecting seat 11 to rotate. The outer crank arm connecting seat 11 drives the outer crank arm 12 to swing. The swinging outer crank arm 12 drives the moving contact of the closing resistor in the arc-extinguishing chamber to slowly approach the stationary contact of the closing resistor through the transmission rod inside the arc-extinguishing chamber, so that the resistance circuit is closed. After the resistance circuit is closed, handle 8 is no longer operated, so that the main circuit is in the open state. Under the self-locking function of the worm gear reducer, the moving contact of the closing resistor remains in the closed position. Then, the resistance value of the closing resistor is measured by a multimeter using the grounding switches on both sides of the main circuit.

[0067] The circuit breaker provided by this invention mounts a self-locking reducer 9 onto a door frame connecting plate 1 via a reducer mounting base 4. This allows for relative fixation between the reducer 9 and the door frame connecting plate 1, facilitating stable torque output from the reducer 9. The transmission shaft 10 increases the lever arm for driving the outer crank arm 12, reducing the driving force required to drive the outer crank arm 12. This simplifies operation. The self-locking function of the reducer 9 prevents rebound after the closing resistor is closed, improving the efficiency of closing resistor detection and keeping the closing resistor in the closed position. The axial direction of the transmission shaft 10 is aligned with the swing axis of the outer crank arm 12, maximizing the lever arm between the output end 7 of the reducer 9 and the outer crank arm 12, thus improving the torque transmission efficiency between the output end 7 of the reducer 9 and the outer crank arm 12. Compared with existing technologies, this invention allows the main circuit to be disconnected while the resistance circuit in the arc-extinguishing chamber is connected, meeting the state requirements for detecting the closing resistor value.

[0068] The circuit breaker manual opening and closing device provided by this invention can be provided to customers as a maintenance spare part or an auxiliary tool for new substations, thus meeting users' needs for closing resistance detection.

[0069] Embodiment 2 of the circuit breaker provided in this invention:

[0070] The difference between this embodiment and Embodiment 1 is as follows: In Embodiment 1, the door frame connecting plate 1 has a horizontal elongated hole 2, and the reducer mounting base 4 has a vertical elongated hole 3, with the horizontal elongated hole 2 and the vertical elongated hole 3 serving as the first elongated hole and the second elongated hole, respectively. In this embodiment, the mounting base connecting part 6 of the door frame connecting plate 1 has a horizontal elongated hole, and the door frame 26 connecting part of the door frame connecting plate 1 has a vertical elongated hole. The reducer mounting base 4 is fixed to the door frame connecting plate 1 through the horizontal elongated hole, with the horizontal elongated hole and the vertical elongated hole serving as the first elongated hole and the second elongated hole, respectively.

[0071] Of course, in other embodiments, a horizontal elongated hole may be provided on the mounting base connecting part 6 of the door frame connecting plate 1, and a vertical elongated hole may be provided on the side door frame 27.

[0072] Embodiment 3 of the circuit breaker provided in this invention:

[0073] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the outer crank arm connecting seat 11 has a U-shaped structure and is snapped onto the outer crank arm 12. In this embodiment, the outer crank arm 12 has an L-shaped structure, including a side plate and a bottom plate, both of which are screwed to the outer crank arm 12.

[0074] Embodiment 4 of the circuit breaker provided in this invention:

[0075] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the drive shaft 10 is a telescopic structure. However, in this embodiment, the length of the drive shaft 10 is not adjustable, and it is only suitable for environments where there is a fixed distance between the output end 7 of the reducer 9 and the outer crank arm 12.

[0076] Embodiment 5 of the circuit breaker provided in this invention:

[0077] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the bushing 23 of the drive shaft 10 is connected to the output end 7 of the reducer 9, and the shaft body 22 is connected to the outer crank arm connecting seat 11. In this embodiment, the shaft body 22 of the drive shaft 10 has a mounting groove near the end of the reducer 9, and the groove wall has a connecting hole. It is connected to the output end 7 of the reducer 9 by screws, and the square bushing 23 is connected to the outer crank arm connecting seat 11 by screws.

[0078] Embodiment 6 of the circuit breaker provided in this invention:

[0079] The difference between this embodiment and Embodiment 1 is that in Embodiment 1, the door frame connecting plate 1 has two rows of L-shaped fixing holes. In this embodiment, the door frame connecting plate 1 only has vertically distributed fixing holes for connecting the door frame connecting plate 1 to the side door frame 27 of the circuit breaker.

[0080] This invention also provides an embodiment of a manual circuit breaker opening and closing device for detecting closing resistance:

[0081] The structure of the circuit breaker manual opening and closing device for detecting closing resistance in this embodiment is the same as that in the circuit breaker manual opening and closing device in embodiment 1 above, and will not be described again here.

[0082] Of course, in other embodiments, the circuit breaker manual opening and closing device for detecting closing resistance can also use the structure of the circuit breaker manual opening and closing device in any of the embodiments 2 to 6, which will not be described again here.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A manual opening and closing device for circuit breakers used for detecting closing resistance, characterized in that, The device includes two door frame connecting plates (1) for mounting on the door frame (26) of the circuit breaker. A reducer mounting seat (4) is mounted on the door frame connecting plate (1), and a reducer (9) with a self-locking function is mounted on the reducer mounting seat (4). The reducer (9) has an output end (7) and an input end. The output end (7) is connected to a drive shaft (10), and the end of the drive shaft (10) is connected to an outer crank arm connecting seat (11) for driving the outer crank arm (12) of the circuit breaker arc-extinguishing chamber. One of the door frame connecting plates (1) and the reducer mounting seat (4) is provided with a first elongated hole, and the other is provided with a second elongated hole. And / or, one of the door frame connecting plate (1) and the door frame (26) is provided with a first long hole and the other is provided with a second long hole, and / or, the part of the door frame connecting plate (1) for connecting with the reducer mounting base (4) is provided with a first long hole and the part for connecting with the door frame (26) is provided with a second long hole, the first long hole and the second long hole are perpendicular to each other, so that connecting bolts can pass through to fix the two corresponding components in the door frame (26), the door frame connecting plate (1) and the reducer mounting base (4) and adjust the horizontal and vertical positions of the drive shaft (10) so that the drive shaft (10) is aligned with the swing axis of the outer crank arm (12).

2. The manual opening and closing device for circuit breaker used for detecting closing resistance according to claim 1, characterized in that, The outer crank arm connecting seat (11) has a U-shaped structure, including a base plate (19) and side plates (18) on both sides of the base plate (19). The base plate (19) is fastened to the outer crank arm (12) in a manner perpendicular to the swing axis of the outer crank arm (12). The side plates (18) are used to snap onto both sides of the swing direction of the outer crank arm (12).

3. The circuit breaker manual opening and closing device for detecting closing resistance according to claim 2, characterized in that, The outer crank arm connecting seat (11) is provided with a fixing arm (20), which is used to connect with the outer crank arm (12) by screws.

4. The manual opening and closing device for circuit breaker used for detecting closing resistance according to claim 1, 2, or 3, characterized in that, The drive shaft (10) is a telescopic structure used to adjust the distance between the output end (7) of the reducer (9) and the outer crank arm connecting seat (11) to accommodate assembly errors.

5. The manual opening and closing device for circuit breaker used for detecting closing resistance according to claim 4, characterized in that, The drive shaft (10) includes a shaft body (22) and a bushing (23). The bushing (23) is connected to the output end (7) of the reducer (9). The shaft body (22) is slidably mounted in the bushing (23) along the axial direction and is limited in the bushing (23) along the circumferential direction. The end of the shaft body (22) extending out of the bushing (23) is connected to the outer crank arm connecting seat (11).

6. The manual opening and closing device for circuit breaker used for detecting closing resistance according to claim 1, 2, or 3, characterized in that, Both door frame connecting plates (1) are provided with two rows of L-shaped fixing holes. The vertically arranged fixing holes are used to fix the door frame connecting plate (1) to the side door frame (27) of the circuit breaker, and the horizontally arranged fixing holes are used to fix the door frame connecting plate (1) to the bottom door frame (28) of the circuit breaker.

7. The manual opening and closing device for circuit breaker used for detecting closing resistance according to claim 1, 2, or 3, characterized in that, The reducer mounting base (4) includes a transverse connecting plate (30) for connecting with the door frame connecting plate (1) and a stiffening plate (29) perpendicular to the plane of the transverse connecting plate.

8. A circuit breaker, comprising an arc-extinguishing chamber and a manual circuit breaker opening and closing device, wherein a closing resistor circuit is provided in the arc-extinguishing chamber, and an external crank arm (12) for driving the closing resistor circuit to close is provided outside the arc-extinguishing resistor; the circuit breaker further comprises a manual circuit breaker opening and closing device for driving the external crank arm (12) to operate, characterized in that, The circuit breaker manual opening and closing device is the circuit breaker manual opening and closing device for detecting closing resistance as described in any one of claims 1 to 7.

9. The circuit breaker according to claim 8, characterized in that, The outer crank arm (12) is a plate-shaped structure. The outer crank arm (12) has a snap-fit ​​surface (31) on both sides of its swing direction for the outer crank arm connecting seat (11) in the manual opening and closing device of the circuit breaker to snap into.

10. The circuit breaker according to claim 8, characterized in that, The outer crank arm (12) is provided with a pivot hole (13) for rotating and mounting on the arc-extinguishing chamber. The outer crank arm (12) is provided with a groove (14) on one side of the pivot hole (13). The groove (14) divides the outer crank arm (12) on one side of the pivot hole (13) into two clamping plates (17). One clamping plate (17) is provided with a light hole (16), and the other clamping plate (17) is provided with a threaded hole (15). The light hole (16) and the threaded hole (15) are connected to each other.

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