Three-phase circuit breaker transmission device and three-phase circuit breaker

Abstract

The invention relates to the technical field of high-voltage or large-current switches with arc extinguishing or arc preventing devices, in particular to a three-phase circuit breaker transmission device and a three-phase circuit breaker. The three-phase circuit breaker comprises a three-phase circuit breaker transmission device, the three-phase circuit breaker transmission device comprises a butt joint device, one end of the butt joint device is a fixing part, the fixing part is provided with a hole for an insulating pull rod to penetrate through, and the fixing part extends out of a matching part in the direction perpendicular to the fixing part. Limiting grooves are formed in the two sides, in the three-phase arrangement direction of the circuit breaker body, of the matching part, a mounting part is arranged at one end of the matching part, a mounting plate is fixedly connected to the mounting part, a reserved hole for the transmission rod to penetrate through is formed in the mounting plate, and a synchronous block is rotationally connected to one end of the transmission rod; compared with a traditional transmission structure, the transmission structure has the advantages that the design of a crank arm box is reduced, the structure is simple, and the cost is relatively low.

Description

Technical Field

[0001] The present invention relates to the technical field of high-voltage or high-current switches with arc extinguishing or arc protection devices, and in particular to a three-phase circuit breaker transmission device and a three-phase circuit breaker. Background Art

[0002] The three-phase circuit breaker mainly consists of three parts: the circuit breaker body, the operating mechanism and the transmission device. The circuit breaker body consists of two side phases and one middle phase, and usually contains contacts, arc extinguishing devices and other parts. It is used for overload protection, short circuit protection and ground fault protection in three-phase circuits. The operating mechanism is an important component of the three-phase circuit breaker, which is used to provide the energy and operating force required for the opening and closing of the circuit breaker. The transmission mechanism is the key part connecting the operating mechanism and the circuit breaker body, which is used to transmit the action of the operating mechanism to the circuit breaker body, thereby realizing the opening and closing operations of the circuit breaker.

[0003] Currently, common transmission devices are direct-connected mechanisms or planar four-bar linkages. Direct-connected mechanisms are mechanisms in which the output shaft bracket is directly connected to the transmission shaft of the high-voltage switchgear, while planar four-bar linkages are mechanisms in which the output shaft is connected to the crank arm of the high-voltage switchgear through an output crank arm and a connecting rod, thereby driving the rotation of the transmission shaft to complete the on-off operation of the equipment.

[0004] A Chinese invention patent application with application publication number CN110323097A and application publication date October 11, 2019 discloses a center-mounted high-voltage circuit breaker operating mechanism and a high-voltage circuit breaker. The transmission mechanism of the high-voltage circuit breaker adopts a planar four-bar structure. A crank box is arranged at the end of the circuit breaker body close to the operating mechanism. The input end of the crank box is rotatably connected to the planar four-bar. The rotational motion output by the operating mechanism is converted into linear motion of the insulating pull rod in the circuit breaker body through the crank box. A phase crank arm is arranged between the planar four-bar and the crank box, which is simultaneously connected to the crank boxes of the three-phase circuit breaker. The precise and synchronous breaking function of the three-phase circuit breaker is achieved by controlling the phase crank arm. The use of a planar four-bar structure requires a crank box to be provided at one end of the circuit breaker body close to the operating mechanism. The operating mechanism is arranged parallel to the crank box, and the output shaft of the operating mechanism is arranged parallel to the transmission shaft of the crank box, which places requirements on the position of the operating mechanism. When a direct-connected structure is used, it is necessary to ensure that the output shaft of the operating mechanism is coaxially installed with the transmission shaft of the crank box, and the operating mechanism needs to be installed laterally on the circuit breaker body. Regardless of the planar four-bar structure or the direct-connected structure, a crank box needs to be provided at one end of the circuit breaker body. The crank box includes a transmission shaft, an inner crank arm, an outer crank arm, a bearing, a sealing structure, etc. The structure is relatively complex and the cost is relatively high. Summary of the invention

[0005] The object of the present invention is to provide a three-phase circuit breaker transmission device to reduce the cost of the three-phase circuit breaker transmission device.

[0006] The present invention also aims to provide a three-phase circuit breaker to solve the above-mentioned problem.

[0007] The three-phase circuit breaker transmission device of the present invention adopts the following technical solutions: A three-phase circuit breaker transmission device comprises a docking device arranged corresponding to the circuit breaker body, one end of the docking device is a fixing part for fixedly connecting with the circuit breaker body, the fixing part is provided with a hole for passing an insulating pull rod, the fixing part is provided with a matching part extending in a direction perpendicular to the fixing part, limiting grooves are arranged on both sides of the matching part in the three-phase arrangement direction of the circuit breaker body, an installation part is arranged at one end of the matching part away from the fixing part, a mounting plate for installing an operating mechanism is fixedly connected to the mounting part, a reserved hole corresponding to the middle of the circuit breaker body for passing a transmission rod is arranged on the mounting plate, one end of the transmission rod is rotatably connected with a synchronization block, the synchronization block is located in the limiting groove of the matching part, a bolt hole for corresponding installation with the insulating pull rod is arranged on the side of the synchronization block away from the transmission rod, and the other end of the transmission rod is rotatably connected with a mechanism crank arm for connecting with the output shaft of the operating mechanism.

[0008] Furthermore, the mounting plate is a cross structure, including a vertical portion and a horizontal portion, the vertical portion is provided with bolt holes for fixed connection with the operating mechanism, and the horizontal portion is provided with bolt holes for fixed installation of the docking device.

[0009] Furthermore, the matching part is a hollow structure, and at least one slide rail along the moving direction of the synchronization block is arranged in the matching part, a slider is arranged on the slide rail, and the synchronization block and the slider are fixedly connected by a connecting block.

[0010] Furthermore, two slide rails are provided, which are respectively located on the docking devices on both sides.

[0011] Furthermore, an operating hole for fixedly connecting the synchronization block and the slider is provided on the matching portion.

[0012] Furthermore, a connecting block is installed on the synchronization block, the cross-sectional shape of the connecting block is L-shaped, one side of the connecting block is provided with a bolt hole for fixed connection with the synchronization block, and the other side is provided with a bolt hole for fixed connection with the slider.

[0013] Furthermore, a spline groove for spline connection with an output shaft of the operating mechanism is provided on the mechanism crank arm.

[0014] Furthermore, the mounting plate is provided with bolt holes for connecting with the operating mechanism.

[0015] Furthermore, a groove is formed on the synchronization block, a bolt hole for connecting with the insulating pull rod is provided at the bottom of the groove, a connecting plate is provided on one side of the top of the groove, and a connecting hole for rotationally connecting with the mechanism crank arm is provided on the connecting plate.

[0016] Beneficial effects: The three-phase circuit breaker transmission device of the present invention is an improved invention. The three-phase circuit breaker transmission device of the present invention includes a docking device corresponding to the circuit breaker body, and precise operation is achieved by synchronously operating the three phases of the circuit breaker body. One end of the docking device is a fixing part for fixed connection with the circuit breaker body, and the fixing part is provided with a hole for the insulating pull rod to pass through. The fixing part extends with a mating part in a direction perpendicular to the fixing part. The mating part is provided with limiting grooves on both sides of the mating part in the three-phase arrangement direction of the circuit breaker body. The end of the mating part away from the fixing part is provided with a mounting part, and a mounting plate for mounting the operating mechanism is fixedly connected to the mounting part, and the mounting plate is provided with a mounting plate for mounting the circuit breaker. A corresponding reserved hole is provided in the middle of the device body for the transmission rod to pass through, one end of the transmission rod is rotatably connected with a synchronization block, the synchronization block is located in the limiting groove of the matching part, and the groove structure is used to limit the travel direction of the synchronization block, and a bolt hole for corresponding installation with the insulating pull rod is provided on the side of the synchronization block away from the transmission rod, and the other end of the transmission rod is rotatably connected with a mechanism crank arm for connecting with the output shaft of the operating mechanism, and the mechanism crank arm and the transmission rod convert the output of the output shaft of the operating mechanism into the translational motion of the synchronization block. Compared with the traditional transmission structure, the present device reduces the design of the crank arm box, has a simple structure and low cost.

[0017] The three-phase circuit breaker of the present invention adopts the following technical solutions: A three-phase circuit breaker comprises a three-phase circuit breaker transmission device, the three-phase circuit breaker transmission device comprises a docking device arranged corresponding to the circuit breaker body, one end of the docking device is a fixing part for fixing with the circuit breaker body, the fixing part is provided with a hole for passing an insulating pull rod, the fixing part is provided with a matching part extending in a direction perpendicular to the fixing part, limiting grooves are arranged on both sides of the matching part in the three-phase arrangement direction of the circuit breaker body, an installation part is arranged at one end of the matching part away from the fixing part, a mounting plate for installing an operating mechanism is fixedly connected to the mounting part, a reserved hole corresponding to the middle of the circuit breaker body for passing a driving rod is arranged on the mounting plate, one end of the driving rod is rotatably connected with a synchronization block, the synchronization block is located in the limiting groove of the matching part, a bolt hole for corresponding installation with the insulating pull rod is arranged on the side of the synchronization block away from the driving rod, and the other end of the driving rod is rotatably connected with a mechanism crank arm for connecting with the output shaft of the operating mechanism.

[0018] Furthermore, the mounting plate is a cross structure, including a vertical portion and a horizontal portion, the vertical portion is provided with bolt holes for fixed connection with the operating mechanism, and the horizontal portion is provided with bolt holes for fixed installation of the docking device.

[0019] Furthermore, the matching part is a hollow structure, and at least one slide rail along the moving direction of the synchronization block is arranged in the matching part, a slider is arranged on the slide rail, and the synchronization block and the slider are fixedly connected by a connecting block.

[0020] Furthermore, two slide rails are provided, which are respectively located on the docking devices on both sides.

[0021] Furthermore, an operating hole for fixedly connecting the synchronization block and the slider is provided on the matching portion.

[0022] Furthermore, a connecting block is installed on the synchronization block, the cross-sectional shape of the connecting block is L-shaped, one side of the connecting block is provided with a bolt hole for fixed connection with the synchronization block, and the other side is provided with a bolt hole for fixed connection with the slider.

[0023] Furthermore, a spline groove for spline connection with an output shaft of the operating mechanism is provided on the mechanism crank arm.

[0024] Furthermore, the mounting plate is provided with bolt holes for connecting with the operating mechanism.

[0025] Furthermore, a groove is formed on the synchronization block, a bolt hole for connecting with the insulating pull rod is provided at the bottom of the groove, a connecting plate is provided on one side of the top of the groove, and a connecting hole for rotationally connecting with the mechanism crank arm is provided on the connecting plate.

[0026] Beneficial effect: The three-phase circuit breaker of the present invention is an improved invention. The three-phase circuit breaker of the present invention includes a three-phase circuit breaker transmission device, which includes a docking device arranged corresponding to the circuit breaker body. Precise operation is achieved by synchronously operating the three phases of the circuit breaker body. One end of the docking device is a fixing portion for fixed connection with the circuit breaker body. The fixing portion is provided with a hole for the insulating pull rod to pass through. The fixing portion extends with a mating portion in a direction perpendicular to the fixing portion. The mating portion is provided with limiting grooves on both sides of the three-phase arrangement direction of the circuit breaker body. An installation portion is provided at one end of the mating portion away from the fixing portion. A mounting plate for mounting an operating mechanism is fixedly connected to the mounting portion. The mounting plate is provided with a mounting plate for mounting an operating mechanism. The plate is provided with a reserved hole corresponding to the middle of the circuit breaker body for the transmission rod to pass through, one end of the transmission rod is rotatably connected with a synchronization block, the synchronization block is located in the limiting groove of the matching part, and the groove structure is used to limit the travel direction of the synchronization block, and a bolt hole for corresponding installation with the insulating pull rod is provided on the side of the synchronization block away from the transmission rod, and the other end of the transmission rod is rotatably connected with a mechanism crank arm for connecting with the output shaft of the operating mechanism, and the mechanism crank arm and the transmission rod convert the output of the output shaft of the operating mechanism into the translational motion of the synchronization block. Compared with the traditional transmission structure, the device reduces the design of the crank arm box, has a simple structure and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a structural schematic diagram of an embodiment of a three-phase circuit breaker of the present invention; Figure 2 for Figure 1 A partial enlarged view of Figure 3It is a structural diagram of a synchronization block; Figure 4 It is a structural schematic diagram of the mounting plate; Figure 5 is a schematic diagram of the structure of the transmission rod; Figure 6 is a structural schematic diagram of a docking device; Figure 7 It is a structural schematic diagram of the mechanism crank arm; Figure 8 A schematic diagram of the connection block structure.

[0028] In the figure: 1. circuit breaker body; 2. docking device; 3. mounting plate; 4. docking pin; 5. operating mechanism; 6. mechanism crank arm; 7. crank arm pin; 8. mechanism output shaft; 9. transmission rod; 10. slide rail; 11. synchronization block; 12. connecting block; 13. insulating pull rod; 14. connecting hole; 15. connecting plate; 16. reserved hole; 17. operating hole; 18. fixing part; 19. matching part; 20. mounting part. DETAILED DESCRIPTION

[0029] The features and performance of the present invention are further described in detail below in conjunction with the embodiments.

[0030] The transmission device of the three-phase circuit breaker selects different transmission forms according to different use conditions. The idea of ​​the present invention is to realize the synchronous breaking of the three-phase circuit breaker by setting a transmission device that converts rotational motion into translational motion. The specific implementation of the three-phase circuit breaker transmission device of the present invention is as follows: Based on the above ideas, Figure 1 , 2, 5, 6, and 7, in a basic embodiment, the three-phase circuit breaker transmission device of the present invention includes a docking device corresponding to the circuit breaker body 1, and precise operation is achieved by synchronously operating the three phases of the circuit breaker body. One end of the docking device 2 is a fixing portion 18 for fixing with the circuit breaker body 1, and the fixing portion 18 is provided with a hole for the insulating pull rod 13 to pass through. The fixing portion 18 extends with a matching portion 19 in a direction perpendicular to the fixing portion 18. The matching portion 19 is provided with limited position grooves on both sides of the three-phase arrangement direction of the circuit breaker body 1. The matching portion 19 is provided with a mounting portion 20 at one end away from the fixing portion 18. The mounting portion 20 is fixedly connected with a mounting plate 3 for mounting the operating mechanism 5, and the mounting plate 3 is provided with a corresponding middle portion of the circuit breaker body 1 for providing The transmission rod passes through the reserved hole 16 of 9, and one end of the transmission rod 9 is rotatably connected with a synchronization block 11, which is located in the limiting groove of the matching part. The groove structure is used to limit the travel direction of the synchronization block 11. The side of the synchronization block 11 away from the transmission rod 9 is provided with a bolt hole for corresponding installation with the insulating pull rod 13. The other end of the transmission rod 9 is rotatably connected with a mechanism crank arm 6 for connecting with the output shaft 7 of the operating mechanism. The output of the output shaft 7 of the operating mechanism is converted into a translational motion of the synchronization block 11 through the mechanism crank arm 6 and the transmission rod 9, which can meet the relative position relationship of the operating mechanism 5 installed at one end of the circuit breaker body 1. At the same time, compared with the traditional transmission structure, the device reduces the design of the crank box, has a simple structure and low cost.

[0031] like Figure 4 As shown, in a preferred embodiment, the mounting plate 3 is a cross structure, including a vertical portion and a horizontal portion, the vertical portion is provided with a bolt hole for fixed connection with the operating mechanism 5, the vertical portion cooperates with the side of the operating mechanism 5, and is provided with a hole for inserting a cable, and the horizontal portion is provided with a bolt hole for fixing and installing the docking device 2, and the horizontal portion is designed according to the spacing of the circuit breaker body, which can save costs while ensuring stability. In other embodiments, the mounting plate 3 can adopt a square structure, although it will increase the production material and transportation costs, it can also work normally.

[0032] In a preferred embodiment, the matching part 19 is a hollow structure, and at least one slide rail 10 is arranged in the matching part 19 along the direction of travel of the synchronization block 11, and a slider is arranged on the slide rail 10. The synchronization block 11 and the slider are fixedly connected by the connecting block 12. By setting the slide rail 10 and the slider, the reliable translation of the synchronization block 11 can be guaranteed, and the synchronization block 11 can be prevented from swinging and causing damage to the docking device 2, which affects the opening and closing of the three-phase circuit breaker. In other embodiments, the slide rail 10 is not provided, and the vertical direction of the synchronization block 11 is limited only by the long groove. Although the service life of the transmission device will be reduced, it can also work normally. Two slide rails 10 are provided, which are respectively located on the docking devices 2 on both sides. The limited positioning of the synchronization block 11 is achieved by the slide rails 10 at both ends. Because the synchronization block 11 spans the three-phase docking device 2 of the circuit breaker body 1, the slide rails 10 and the slider are provided at both ends to achieve reliable translation, and the production cost and the realization effect are relatively balanced.

[0033] In a preferred embodiment, the mating portion 19 is provided with an operating hole 17 for fixing the synchronous block 11 and the slider, and the synchronous block 11 and the slider can be quickly disassembled and assembled through the operating hole 17, which reduces the difficulty of installation and facilitates maintenance and replacement. In other embodiments, the operating hole 17 is not provided on the mating section, which may increase the difficulty of installation and may require the use of special tools, but it can also work normally.

[0034] like Figure 8 As shown, in a preferred embodiment, a connection block 12 is installed on the synchronization block 11, and the cross-sectional shape of the connection block 12 is L-shaped. A bolt hole for fixed connection with the slider is provided on one side of the connection block 12, and a bolt hole for fixed connection with the synchronization block 11 is provided on the other side. By providing the connection block 12, the difficulty of fixed connection and installation between the synchronization block 11 and the slider can be reduced, and the synchronization block 11 can be ensured to move along the slide rail 10 to realize the breaking control of the circuit breaker body 1. In other embodiments, the connection block 12 may not be provided, and the synchronization block 11 and the slider are bonded and fixed, which can achieve a similar effect.

[0035] In a preferred embodiment, a spline groove for spline connection with the operating mechanism output shaft 8 is provided on the mechanism crank arm, and the mechanism crank arm is connected to the output shaft of the operating mechanism 5 through the spline, which can achieve reliable and accurate transmission, and at the same time, the required torque is small, thereby improving the service life of the transmission device. In other embodiments, although the torque required for rotation is large and the service life is reduced by using a key connection, it can also work normally.

[0036] In a preferred embodiment, the mounting plate 3 is provided with bolt holes for connecting with the operating mechanism 5, and the mounting holes are fixedly connected to the operating mechanism 5 by bolts, so that a reliable connection can be achieved, and at the same time, the relative position between the operating mechanism 5 and the circuit breaker body 1 is fixed. In other embodiments, the mounting plate 3 can be fixed to the operating mechanism 5 by welding, which can work normally although maintenance and replacement are more difficult.

[0037] like Figure 3 As shown, in a preferred embodiment, a groove is provided on the synchronization block 11, and a bolt hole for connecting to the insulating pull rod 13 is provided at the bottom of the groove, and a connecting plate 15 is provided on one side of the top of the groove, and a connecting hole 14 for rotatably connecting to the mechanism crank arm 6 is provided on the connecting plate. The side where the synchronization block 11 cooperates with the pull rod joint 12 is a straight edge, and the synchronization block 11 is rotatably connected to the transmission rod 9 through the connecting plate 15. The side where the connecting plate 15 is located is distributed in a "human" shape, and the matching position of the synchronization block 11 and the transmission rod 9 is the midpoint of this side, so as to avoid collision or friction damage between the synchronization block 11 and the docking device 2, resulting in asynchronous disconnection of the three-phase circuit breaker.

[0038] During installation, first install the mounting plate 3 on the operating mechanism 5, install the docking device 2 with the slide rail 10 installed on the mounting plate 3, install the connecting block 12 on the synchronous block 11, insert the synchronous block 11 into the docking device 2, and fix the connecting block 12 and the slider through the operation hole reserved on the docking device 2. Connect the mechanism crank arm 6 to the operating mechanism output shaft 8 through a spline stop, connect the transmission rod 9 to the mechanism crank arm 6 through the crank arm pin 7, and connect the transmission rod 9 to the synchronous block 11 through the docking pin shaft 4. Then, fix the insulating pull rod 13 to the synchronous block 11, and fix the docking device 2 to the three phases of the circuit breaker body 1 through the flange to complete the installation.

[0039] During operation, the operating mechanism 5 receives the external model, and the rotation of the output shaft inputs torque to the transmission device, which is then converted into a translational motion of the synchronization block 11 through the mechanism arm 6 and the transmission rod 9. The synchronization block 11 pushes the insulating pull rod 13 to move inward and outward to realize the opening and closing switching of the three-phase circuit breaker.

[0040] The specific implementation of the three-phase circuit breaker of the present invention is as follows: In a basic embodiment, the three-phase circuit breaker of the present invention includes a transmission device, and the transmission device is a three-phase circuit breaker transmission device. The specific implementation of the three-phase circuit breaker transmission device is as described above and will not be repeated.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The patent protection scope of the present invention shall be based on the claims. All equivalent structural changes made using the contents of the description and drawings of the present invention should also be included in the protection scope of the present invention.

Claims

1. A three-phase circuit breaker transmission device, characterized in that: The three-phase circuit breaker transmission device includes a docking device arranged corresponding to the circuit breaker body, one end of the docking device is a fixing part for fixedly connecting with the circuit breaker body, the fixing part is provided with a hole for the insulating pull rod to pass through, the fixing part is provided with a matching part extending in a direction perpendicular to the fixing part, and the matching part is provided with limiting grooves on both sides in the three-phase arrangement direction of the circuit breaker body, and an installation part is provided at one end of the matching part away from the fixing part, and a mounting plate for installing an operating mechanism is fixedly connected to the mounting part, and a reserved hole corresponding to the middle of the circuit breaker body for the transmission rod to pass through is provided on the mounting plate, one end of the transmission rod is rotatably connected with a synchronization block, the synchronization block is located in the limiting groove of the matching part, and a bolt hole for corresponding installation with the insulating pull rod is provided on the side of the synchronization block away from the transmission rod, and the other end of the transmission rod is rotatably connected with a mechanism crank arm for connecting with the output shaft of the operating mechanism.

2. The three-phase circuit breaker transmission device according to claim 1, characterized in that: The mounting plate is a cross structure, including a vertical portion and a horizontal portion. The vertical portion is provided with bolt holes for fixed connection with the operating mechanism, and the horizontal portion is provided with bolt holes for fixed installation of the docking device.

3. The three-phase circuit breaker transmission device according to claim 1 or 2, characterized in that: The matching part is a hollow structure, and at least one slide rail along the moving direction of the synchronization block is arranged in the matching part. A slider is arranged on the slide rail, and the synchronization block and the slider are fixedly connected by a connecting block.

4. The three-phase circuit breaker transmission device according to claim 3, characterized in that: The slide rails are provided in two pieces and are respectively located on the docking devices at both sides.

5. The three-phase circuit breaker transmission device according to claim 3, characterized in that: The matching portion is provided with an operating hole for fixedly connecting the synchronization block and the slider.

6. The three-phase circuit breaker transmission device according to claim 3, characterized in that: A connecting block is installed on the synchronization block, and the cross-sectional shape of the connecting block is L-shaped. One side of the connecting block is provided with a bolt hole for fixed connection with the synchronization block, and the other side is provided with a bolt hole for fixed connection with the slider.

7. The three-phase circuit breaker transmission device according to claim 1 or 2, characterized in that: The mechanism crank arm is provided with a spline groove for spline connection with the output shaft of the operating mechanism.

8. The three-phase circuit breaker transmission device according to claim 1 or 2, characterized in that: The mounting plate is provided with bolt holes for connecting with the operating mechanism.

9. The three-phase circuit breaker transmission device according to claim 1 or 2, characterized in that: The synchronization block is provided with a groove, the bottom of the groove is provided with a bolt hole for connecting with the insulating pull rod, a connecting plate is provided on one side of the top of the groove, and the connecting plate is provided with a connecting hole for rotationally connecting with the mechanism crank arm.

10. A three-phase circuit breaker, comprising a three-phase circuit breaker transmission device, characterized in that: The three-phase circuit breaker transmission device is the three-phase circuit breaker transmission device according to any one of claims 1-9.

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