High-voltage circuit breaker transmission structure adopting gear and rack

Abstract

The high-voltage circuit breaker transmission structure comprises a circuit breaker mechanism and three arc extinguish chambers arranged side by side, a mechanism output rod of the circuit breaker mechanism is coaxially and fixedly connected with a connecting rod assembly, arc extinguish chamber direct-acting pull rods of the arc extinguish chambers are coaxially and fixedly connected with double-sided racks, and the double-sided racks are coaxially and fixedly connected with the connecting rod assembly. The two sides of the double-face rack are meshed with a first gear and a second gear respectively, the first gear is fixedly connected with a third gear, the connecting rod assembly comprises three transmission racks which are coaxially connected, and the three transmission racks are meshed with the three third gears respectively. Reliable opening and closing actions of the circuit breaker are realized through perfect cooperation of the gear rack and the double-sided rack, the circuit breaker has the characteristics of high transmission precision, high efficiency and low vibration, the risk of air leakage of the direct-acting connecting rod of the arc extinguish chamber body is reduced, the overall quality and reliability of the circuit breaker are improved, and the circuit breaker has great practical and economic significance.

Description

Technical Field

[0001] The invention relates to the technical field of high-voltage circuit breakers, and in particular to a transmission structure of a high-voltage circuit breaker using a gear rack. Background Art

[0002] Almost all three-phase linked high-voltage circuit breakers of 220 kV and below on the market use a quadrilateral mechanism with a connecting rod and a crank arm. Regardless of whether the circuit breaker is equipped with a hydraulic mechanism, a permanent magnet mechanism or a spring mechanism, the intermediate transmission device between the mechanism and the three-phase arc extinguishing chamber uses a connecting rod and a crank arm transmission. The only difference is that the crank arm has different structural forms, different strokes, and different processes.

[0003] For example, the mechanism described in the patent "A vacuum circuit breaker transmission mechanism" (patent application number 201410464698.2) by Shu Longsheng adopts a transmission structure in which a connecting rod and a crank arm cooperate; Li Junfeng adopts a transmission structure in which a connecting rod and a crank arm cooperate in "Circuit breaker transmission structure and circuit breaker equipment using the same" (patent application number 201810031297.6); Qin Baoping adopts a transmission structure in which a connecting rod and a crank arm cooperate in "A circuit breaker transmission mechanism" (patent application number 201911249037.7). Dynamic structure; Chen Yueyun used a transmission structure in which a connecting rod and a crank arm cooperated in “A high-voltage circuit breaker and a high-voltage circuit breaker transmission part” (application number 202310009293.9); Hou Xiaomo used a transmission structure in which a connecting rod and a crank arm cooperated in “Circuit breaker transmission device and circuit breaker” (application number 202310278654.X); Ma Feiyue used a transmission structure in which a connecting rod and a crank arm cooperated in “A double-acting high-voltage sulfur hexafluoride circuit breaker transmission device” (application number 202311516679.5).

[0004] The main features of the existing transmission method are simple structure and low cost, but there is a serious defect. The crank arm is connected to the direct-acting pull rod on the arc extinguishing chamber body. When the pull rod moves, it bears a large radial force brought by the crank arm, causing the circuit breaker connecting rod to vibrate and transmit to the arc extinguishing chamber. At the same time, the radial force of the connecting rod will make the direct-acting sealing of the connecting rod and the arc extinguishing chamber difficult. If the number of actions is too many, there is a risk of gas leakage. In high-voltage circuit breakers, SF6 gas, as a breaking and insulating medium, plays a vital role in ensuring the breaking capacity and safe operation of the circuit breaker. Once a leak occurs, it will affect the breaking capacity and normal operation of the circuit breaker. In severe cases, it may even cause a system short circuit or the circuit breaker cannot be broken. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a high-voltage circuit breaker transmission structure using a gear rack. The gear rack transmission is utilized, and a connecting rod connected to a circuit breaker body and a double-sided toothed rack are connected together, so that the radial force of the connecting rod is offset. The transmission scheme has the characteristics of high transmission efficiency, high precision and low vibration.

[0006] The present invention is achieved through the following technical scheme, which provides a high-voltage circuit breaker transmission structure using a gear rack, including a circuit breaker mechanism and three parallel arc extinguishing chambers, a connecting rod assembly is coaxially fixed to the mechanism output rod of the circuit breaker mechanism, a double-sided rack is coaxially fixed to the arc extinguishing chamber direct-acting pull rod of the arc extinguishing chamber, a first gear and a second gear are respectively meshed on both sides of the double-sided rack, a third gear is fixed to the first gear, and the connecting rod assembly includes three coaxially connected transmission racks, and the three transmission racks are respectively meshed with three third gears.

[0007] As an optimization, the first gear and the third gear are fixedly connected to the first rotating shaft, the second gear is fixedly connected to the second rotating shaft, and the first rotating shaft and the second rotating shaft are both axially connected in the circuit breaker beam.

[0008] As an optimization, a rack guide plate is fixedly connected inside the circuit breaker crossbeam, and a guide groove adapted to the transmission rack is opened on the rack guide plate.

[0009] As an optimization, the connecting rod assembly also includes interlaced connecting rods connected between adjacent transmission racks, and the mechanism output rod is connected to the transmission rack at the end through a mechanism connecting rod.

[0010] As an optimization, the two ends of the mechanism connecting rod are respectively connected to the mechanism output rod and the transmission rack through threads, and the threads at the two ends of the mechanism connecting rod have opposite rotation directions.

[0011] As an optimization, the two ends of the interphase connecting rod are respectively connected to two transmission racks through threads, and the threads at the two ends of the interphase connecting rod have opposite rotation directions.

[0012] As an optimization, a closing limiter adapted to the end of the connecting rod assembly is fixedly connected in the circuit breaker crossbeam.

[0013] As an optimization, an oil buffer adapted to the end of the double-sided rack is fixedly connected in the circuit breaker crossbeam.

[0014] As an optimization, a trip spring assembly is installed in the circuit breaker crossbeam, and a trip spring arm connected to the trip spring assembly is fixedly connected to the first rotating shaft or the second rotating shaft.

[0015] The beneficial effects of the present invention are as follows: a high-voltage circuit breaker transmission structure using a gear rack is suitable for the transmission system of a conventional three-phase linkage high-voltage circuit breaker, and the reliable opening and closing action of the circuit breaker is realized through the perfect cooperation of the gear rack and the double-sided rack. The patent of the present invention has the characteristics of high transmission accuracy, high efficiency and low vibration, reduces the risk of leakage of the direct-acting connecting rod of the arc extinguishing chamber body, improves the overall quality and reliability of the circuit breaker, and has great practical and economic significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the internal structure of Embodiment 1 of the present invention; Figure 2 For the present invention Figure 1 Middle partial enlarged picture; Figure 3 For the present invention Figure 2 Side view of Figure 4 This is a schematic diagram of the internal structure of Embodiment 2 of the present invention; Figure 5 For the present invention Figure 4 Middle partial enlarged picture; Figure 6 For the present invention Figure 5 Side view of Figure 7 Another schematic diagram of the internal structure of Embodiment 2 of the present invention; As shown in the figure: 1. Circuit breaker mechanism, 2. Arc extinguishing chamber, 3. Arc extinguishing chamber direct-acting pull rod, 4. Double-sided rack, 5. First gear, 6. Second gear, 7. Transmission rack, 8. First rotating shaft, 9. Second rotating shaft, 10. Mechanism output rod, 11. Mechanism connecting rod, 12. Interphase connecting rod, 13. Third gear, 14. Rack guide plate, 15. Closing limit, 16. Oil buffer, 17. Circuit breaker crossbeam, 18. Opening spring arm, 19. Opening spring assembly. DETAILED DESCRIPTION

[0017] In order to clearly illustrate the technical features of this solution, this solution is described below through a specific implementation method.

[0018] Embodiment 1: like Figures 1 to 7 As shown, a high-voltage circuit breaker transmission structure using a gear rack of the present invention includes a circuit breaker mechanism 1 and three arc extinguishing chambers 2 arranged side by side, the three arc extinguishing chambers 2 are installed side by side on the circuit breaker cross beam 17, the extension direction of the mechanism output rod 10 of the circuit breaker mechanism 1 is consistent with the arrangement direction of the three arc extinguishing chambers 2, and the extension direction of the arc extinguishing chamber direct-acting pull rod 3 in the arc extinguishing chamber 2 is perpendicular to the extension direction of the mechanism output rod 10. The present application is used to realize that the extension of the mechanism output rod 10 drives the three arc extinguishing chamber direct-acting pull rods 3 to extend and retract synchronously.

[0019] A connecting rod assembly is coaxially fixed to the mechanism output rod 10 of the circuit breaker mechanism 1, and the connecting rod assembly includes three coaxially connected transmission racks 7 and interphase connecting rods 12 connected between adjacent transmission racks 7. The mechanism output rod 10 is connected to the transmission rack 7 at the end through a mechanism connecting rod 11.

[0020] The two ends of the mechanism connecting rod 11 are connected to the mechanism output rod 10 and the transmission rack 7 through threads, that is, one end of the mechanism connecting rod 11 is connected to the threaded hole at the end of the mechanism output rod 10 through threads, and the other end of the mechanism connecting rod 11 is connected to the threaded hole at the end of the transmission rack 7 through threads, and the threads at the two ends of the mechanism connecting rod 11 are rotated in opposite directions. Therefore, by rotating the mechanism connecting rod 11, the distance between the mechanism output rod 10 and the transmission rack 7 can be adjusted, thereby adjusting the spacing between the mechanism output rod 10 and the connecting rod assembly, thereby adjusting the adjustment amount of the extension and retraction of the mechanism output rod 10 and the extension and retraction of the three arc extinguishing chamber direct-acting pull rods 3.

[0021] The two ends of the interphase connecting rod 12 are connected to two transmission racks 7 by threads, and the threads at the two ends of the interphase connecting rod 12 are in opposite directions. By rotating the interphase connecting rod 12, the distance between adjacent transmission racks 7 can be adjusted, thereby achieving synchronization of the three arc extinguishing chamber direct-acting pull rods 3.

[0022] In order to guide the transmission rack 7, a rack guide plate 14 is fixedly connected to the circuit breaker crossbeam 17. The rack guide plate 14 is provided with a guide groove adapted to the transmission rack 7. The transmission rack 7 moves axially in the guide groove, thereby constraining its movement trajectory and achieving a better meshing effect.

[0023] A double-sided rack 4 is coaxially fixed to the arc-extinguishing chamber direct-acting pull rod 3 of the arc-extinguishing chamber 2, and the end of the double-sided rack 4 is fixed to the end of the arc-extinguishing chamber direct-acting pull rod 3. The two sides of the double-sided rack 4 are respectively meshed with a first gear 5 and a second gear 6. The first gear 5 and the second gear 6 are symmetrically distributed, and the main function is to improve the stress state of the double-sided rack 4. The first gear 5 and the second gear 6 preferably have the same diameter and module, so as to ensure that the stress state of the double-sided rack is the best and there is no radial force. The double-sided rack 4 of the present invention is not limited to a pair of gears, and can be matched with two or more pairs of gears to ensure that the rack is well stressed.

[0024] The first gear 5 is fixedly connected to the third gear 13, and the three transmission racks 7 are respectively meshed with the three third gears 13. The first gear 5 and the third gear 13 can be a separate structure or an integrated structure. In this embodiment, the first gear 5 and the third gear 13 are separate structures and fixedly connected to the first rotating shaft 8, and the first rotating shaft 8 is axially connected in the circuit breaker beam 17. The second gear 6 is fixedly connected to the second rotating shaft 9, and the second rotating shaft 9 is axially connected in the circuit breaker beam 17.

[0025] The gear of the present application is preferably an involute gear, which has the characteristics of high transmission efficiency, constant transmission ratio, stable transmission, small vibration, large load bearing, etc.

[0026] A closing limiter 15 adapted to the end of the connecting rod assembly is fixedly connected in the circuit breaker cross beam 17. When closing the circuit, the transmission rack 7 away from the circuit breaker mechanism moves to the right and hits the closing limiter 15, and the closing is terminated.

[0027] An oil buffer 16 adapted to the end of the double-sided rack 4 is fixedly connected in the circuit breaker cross beam 17. When the circuit breaker is opened, the double-sided rack 4 moves vertically downward and hits the oil buffer 16 to complete energy dissipation and position limiting.

[0028] Method of use of the present invention: When closing the circuit breaker, the output rod 10 of the mechanism extends to the right, pushing the transmission rack 7 to move horizontally to the right, and the transmission rack 7 drives the third gear 13 to rotate counterclockwise. The rotation of the third gear 13 drives the coaxial first gear 5 to rotate counterclockwise. The counterclockwise rotation of the first gear 5 drives the vertical double-sided rack 4 to move upward to close the circuit breaker. The double-sided rack 4 away from the mechanism moves to the right and hits the closing limit, and the closing is terminated. The second gear 6 is symmetrically distributed with the first gear 5. Its main function is to improve the stress state of the double-sided rack.

[0029] When opening the gate, the output rod 10 of the mechanism retracts to the left, pulling the transmission rack 7 to the left. The movement of the transmission rack 7 drives the third gear 13 to rotate clockwise. The rotation of the third gear 13 drives the first gear 5 to move synchronously. The clockwise movement of the first gear 5 drives the double-sided rack 4 to move vertically downward, and the impact oil buffer completes energy unloading and limiting. Since the transmission systems of circuit breakers, isolating switches and grounding switches in the high-voltage electrical appliance industry are similar, the present invention is not limited to the transmission mechanism of circuit breakers, but can also be used in other equipment.

[0030] Embodiment 2: For circuit breaker mechanisms with built-in closing springs and opening springs, there is no need to set an opening spring assembly in the patented crossbeam.

[0031] like Figure 4-7 As shown, in this embodiment, a trip spring assembly 19 is installed in the circuit breaker crossbeam 17 , and a trip spring arm 18 connected to the trip spring assembly 19 is fixedly connected to the first rotating shaft 8 or the second rotating shaft 9 .

[0032] The opening spring assembly 19 can be appropriately reduced according to the energy storage situation of the circuit breaker mechanism, and an opening spring assembly of two side phases can be used, or the type of the opening spring can be changed.

[0033] When closing the circuit breaker, the closing coil activates the unlocking mechanism locking mechanism, the transmission rack 7 transmits power to the third gear 13, the third gear 13 drives the first gear 5 to rotate, the first gear 5 transmits power to the double-sided rack 4, the double-sided rack 4 moves upward to close the circuit breaker, and at the same time of closing the circuit breaker, the double-sided rack 4 drives the second gear 6 to rotate, the second gear 6 drives the opening spring crank arm 18 to move, and the opening spring crank arm 18 stores energy in the opening spring assembly 19.

[0034] When the gate is opened, the power output direction is opposite. When the gate is opened, the opening coil activates the unlocking mechanism locking mechanism, the energy release of the opening spring drives the opening spring crank arm 18 to move, the rotation of the opening spring crank arm 18 drives the second gear 6 to move, the movement of the second gear 6 drives the double-sided rack 4 to move downward to achieve opening, the movement of the double-sided rack 4 drives the first gear 5 to rotate, the movement of the first gear 5 drives the third gear 13 to move, the movement of the third gear 13 drives the transmission rack 7 to move horizontally, and the mechanism is reset.

[0035] Of course, the above description is not limited to the above examples. Technical features not described in the present invention can be achieved by or by using existing technologies, which will not be described here. The above embodiments and drawings are only used to illustrate the technical scheme of the present invention and are not limitations of the present invention. The present invention is described in detail with reference to the preferred implementation methods. Ordinary technicians in this field should understand that changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention do not depart from the purpose of the present invention, and should also fall within the scope of protection of the claims of the present invention.

Claims

1. A high-voltage circuit breaker transmission structure using a gear rack, comprising a circuit breaker mechanism (1) and three parallel arc extinguishing chambers (2), characterized in that: A connecting rod assembly is coaxially fixedly connected to the mechanism output rod (10) of the circuit breaker mechanism (1), a double-sided rack (4) is coaxially fixedly connected to the arc extinguishing chamber direct-acting pull rod (3) of the arc extinguishing chamber (2), a first gear (5) and a second gear (6) are respectively meshed on both sides of the double-sided rack (4), a third gear (13) is fixedly connected to the first gear (5), and the connecting rod assembly includes three coaxially connected transmission racks (7), and the three transmission racks (7) are respectively meshed with three third gears (13).

2. A high-voltage circuit breaker transmission structure using a gear rack according to claim 1, characterized in that: The first gear (5) and the third gear (13) are fixedly connected to the first rotating shaft (8), the second gear (6) is fixedly connected to the second rotating shaft (9), and the first rotating shaft (8) and the second rotating shaft (9) are both axially connected to the circuit breaker crossbeam (17).

3. A high-voltage circuit breaker transmission structure using a gear rack according to claim 2, characterized in that: A rack guide plate (14) is fixedly connected inside the circuit breaker cross beam (17), and a guide groove adapted to the transmission rack (7) is formed on the rack guide plate (14).

4. A high-voltage circuit breaker transmission structure using a gear rack according to claim 2, characterized in that: The connecting rod assembly also includes interlaced connecting rods (12) connected between adjacent transmission racks (7), and the mechanism output rod (10) is connected to the transmission rack (7) at the end via a mechanism connecting rod (11).

5. A high-voltage circuit breaker transmission structure using a gear rack according to claim 4, characterized in that: The two ends of the mechanism connecting rod (11) are respectively connected to the mechanism output rod (10) and the transmission rack (7) via threads, and the threads at the two ends of the mechanism connecting rod (11) have opposite rotation directions.

6. A high voltage circuit breaker transmission structure using a gear rack according to claim 4, characterized in that: The two ends of the interphase connecting rod (12) are respectively connected to two transmission racks (7) via threads, and the threads at the two ends of the interphase connecting rod (12) have opposite rotation directions.

7. The high-voltage circuit breaker transmission structure using a gear rack according to claim 2, characterized in that: A closing limiter (15) adapted to the end of the connecting rod assembly is fixedly connected inside the circuit breaker crossbeam (17).

8. The high-voltage circuit breaker transmission structure using a gear rack according to claim 2, characterized in that: An oil buffer (16) adapted to the end of the double-sided rack (4) is fixedly connected inside the circuit breaker crossbeam (17).

9. The high-voltage circuit breaker transmission structure using a gear rack according to claim 2, characterized in that: The circuit breaker crossbeam (17) contains a disconnecting spring assembly (19), and the first rotating shaft (8) or the second rotating shaft (9) is fixedly connected with a disconnecting spring arm (18) connected to the disconnecting spring assembly (19).

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