Dual power vacuum circuit breaker

Abstract

The present invention relates to a dual-power vacuum circuit breaker, comprising a mechanism frame, a dual-power sealed pole, a common power operating mechanism, and a backup power operating mechanism. The common power operating mechanism and the backup power operating mechanism both comprise a circuit breaker operating module, a switching main shaft, a crank arm, a connecting plate, and a force reduction connecting arm. One end of the force reduction connecting arm is arranged on the connecting plate, and the connecting plate and the force reduction connecting arm are linked together. A switching spring is arranged between one end of the force reduction connecting arm close to the connecting plate and the mechanism frame. The dual-power sealed pole moves with the force reduction connecting arm and can realize the connection or disconnection of two power supplies of the dual-power sealed pole. An interlocking mechanism is arranged between the common power operating mechanism and the backup power operating mechanism, and the interlocking mechanism can prevent the common power operating mechanism and the backup power operating mechanism from performing the closing action at the same time. The present invention has the advantages of simple structure, stable and reliable performance, compact structure, high safety, and high breaking capacity.

Description

Technical Field

[0001] The invention relates to a vacuum circuit breaker, in particular to a dual-power supply vacuum circuit breaker. Background Art

[0002] With the development of society, in the power distribution system, there are many users who have high requirements for power supply reliability, such as coal mines and refineries. Once a power outage occurs in these units, it will cause significant economic losses to the units and even cause casualties. Therefore, in the power supply systems of these units, it is necessary to have a common power supply and a backup power supply. When a power outage occurs in the common power supply, the backup power supply must be immediately put into use to restore power supply. In order to achieve this goal, it is necessary to automatically switch between the common power supply and the backup power supply through a dual power switching mechanism. The dual power vacuum circuit breaker is used in the medium voltage power distribution system to open, close, carry load current, overload current, short-circuit current and automatically switch between common and backup power supplies. It is widely used in power plants, power grids, petrochemicals, metallurgy, subways, airports, buildings, etc. The existing dual power vacuum circuit breaker includes a mechanism frame, a common power operating mechanism set on the mechanism frame, a dual power solid-sealed pole set on the mechanism frame, a common power operating mechanism and a backup power operating mechanism respectively set on the mechanism frame and used to control the on and off of the dual power solid-sealed pole, and an interlocking mechanism set between the common power operating mechanism and the backup power operating mechanism. The interlock mechanism of the existing dual-power vacuum circuit breaker has a complex structure design, cumbersome operation, and unreliable interlocking. In addition, the dual-power vacuum circuit breaker has the defects of complex structure, unreliable performance, and low safety. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects of the prior art and provide a dual-power vacuum circuit breaker with simple structure, stable and reliable performance, compact structure, high safety and high breaking capacity.

[0004] To achieve the above-mentioned object, the present invention adopts a dual-power vacuum circuit breaker, comprising a mechanism frame, at least one dual-power sealed pole arranged on one side of the mechanism frame and having two power supply circuits, a common power operating mechanism and a backup power operating mechanism symmetrically arranged on the mechanism frame and used to drive the dual-power sealed pole to be turned on and off, the common power operating mechanism and the backup power operating mechanism both comprising a circuit breaker operating module, a switching main shaft linked with the circuit breaker operating module, a crank arm linked with the switching main shaft, a connecting plate linked with the crank arm, and a force reducing connecting arm rotatably arranged on the mechanism frame at the corresponding connecting plate, the force reducing connecting arm One end of the force connecting arm is arranged on the connecting plate, and constitutes a linkage cooperation between the connecting plate and the force reducing connecting arm. A disconnecting spring is arranged between the end of the force reducing connecting arm close to the connecting plate and the mechanism frame. The force reducing connecting arms of the common power supply operating mechanism and the backup power supply operating mechanism are respectively and linkage-arranged on the two ends of the dual power supply sealed pole. The dual power supply sealed pole moves with the force reducing connecting arm and can realize the connection or disconnection of the two power supplies of the dual power supply sealed pole. An interlocking mechanism is arranged between the common power supply operating mechanism and the backup power supply operating mechanism, and the interlocking mechanism can prevent the common power supply operating mechanism and the backup power supply operating mechanism from performing the closing action at the same time.

[0005] The beneficial effects of the above structure are: the force reduction connecting arm of the common power operating mechanism and the backup power operating mechanism adopts a lever-type structure to drive the dual power sealed pole, which can achieve the output of the operating force of the common power operating mechanism and the backup power operating mechanism, which is conducive to speeding up the closing speed, and the force reduction connecting arm is provided with a gate opening spring. When the gate is opened, the gate opening spring releases energy, and the gate opening speed is faster, which is conducive to improving the breaking capacity of the dual power vacuum circuit breaker. And the dual power vacuum circuit breaker has the advantages of simple structure, stable and reliable performance, compact structure, high safety, and high breaking capacity.

[0006] In particular, the interlocking mechanism includes a spare interlocking crank arm linked to the opening and closing main shaft of the common power operating mechanism, a spare locking connecting rod linked to the spare interlocking crank arm, a common interlocking crank arm linked to the opening and closing main shaft of the spare power operating mechanism, and a common locking connecting rod linked to the common interlocking crank arm, one end of the spare locking connecting rod is provided with a first driving protrusion linked to the spare closing latch of the spare power operating mechanism, and one end of the common locking connecting rod is provided with a second driving protrusion linked to the common closing latch of the common power operating mechanism. An interlocking mechanism is provided between the common power operating mechanism and the backup power operating mechanism, so as to prevent the common power operating mechanism and the backup power operating mechanism from performing the closing action at the same time, which is beneficial to improving the safety performance of the dual power vacuum circuit breaker. During operation, when the common power operating mechanism is in the closing state, the backup locking link abuts against the backup closing latch. At this time, the backup power operating mechanism is in the opening state and cannot perform the closing action; only when the common power operating mechanism is in the opening state, the backup locking link is unlocked, and the backup power operating mechanism adopts the closing action. When the backup power operating mechanism is in the closing state, the common locking link abuts against the common closing latch. At this time, the common power operating mechanism is in the opening state and cannot perform the closing action.

[0007] In particular, a first spring seat is provided on the force reducing connecting arm at one end corresponding to the opening spring, a second spring seat is provided on the mechanism frame at the other end corresponding to the opening spring, and both ends of the opening spring are respectively arranged in the first spring seat and the second spring seat. The opening spring can enhance the opening force of the common power supply operating mechanism and the backup power supply operating mechanism, which is beneficial to improve the breaking capacity of the dual power supply vacuum circuit breaker.

[0008] In particular, the dual power sealed pole includes an insulating column arranged on a mechanism frame, a first insulating pull rod arranged in linkage with a force reducing link arm of a common power operating mechanism, a first conductive block, a first vacuum arc extinguishing chamber, a conductive clamp, a second vacuum arc extinguishing chamber, a second conductive block, and a second insulating pull rod arranged in linkage with a force reducing link arm of a backup power operating mechanism; the first insulating pull rod, the first conductive block, the first vacuum arc extinguishing chamber, the conductive clamp, the second vacuum arc extinguishing chamber, the second conductive block, and the second insulating pull rod are arranged in sequence from top to bottom in the insulating column; the first moving contact in the first vacuum arc extinguishing chamber cooperates with the first insulating pull rod in linkage; the second moving contact in the second vacuum arc extinguishing chamber cooperates with the second insulating pull rod in linkage; the insulating column is respectively provided with a common power incoming line contact, an outgoing line contact, and a backup power contact electrically connected to the first conductive block, the conductive clamp, and the second conductive block. The dual-power sealed pole is provided with a first vacuum arc extinguishing chamber and a second vacuum arc extinguishing chamber respectively. The common power supply operating mechanism and the backup power supply operating mechanism drive the first vacuum arc extinguishing chamber and the second vacuum arc extinguishing chamber respectively through an insulating pull rod, thereby realizing the control of connecting or disconnecting the two power supply circuits of the dual-power sealed pole. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a left view of an embodiment of the present invention.

[0010] Figure 2 It is a front view of the internal structure of an embodiment of the present invention.

[0011] Figure 3 It is a right view of the internal structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0012] like Figures 1 to 3As shown, the embodiment of the present invention is a dual-power vacuum circuit breaker, comprising a mechanism frame 10, at least one dual-power sealed pole 11 arranged on one side of the mechanism frame 10 and having two power supply circuits, a common power operating mechanism 20 and a backup power operating mechanism 21 symmetrically arranged on the mechanism frame 10 and used to drive the dual-power sealed pole 11 to be turned on and off, the common power operating mechanism 20 and the backup power operating mechanism 21 both comprising a circuit breaker operating module 200, a switching main shaft 201 arranged in linkage with the circuit breaker operating module 200, a crank arm 202 arranged in linkage with the switching main shaft 201, a connecting plate 203 arranged in linkage with the crank arm 202, and a force reducing connecting arm 204 arranged on the mechanism frame 10 at a position corresponding to the connecting plate 203, wherein the force reducing connecting arm 204 is rotatably arranged on the mechanism frame 10. One end of 04 is arranged on the connecting plate 203, and constitutes the linkage cooperation between the connecting plate 203 and the force reduction connecting arm 204. A disconnecting spring 205 is arranged between the end of the force reduction connecting arm 204 close to the connecting plate 203 and the mechanism frame 10. The force reduction connecting arms 204 of the common power supply operating mechanism 20 and the backup power supply operating mechanism 21 are respectively arranged on the two ends of the dual power supply solid-sealed pole 11 in linkage. The dual power supply solid-sealed pole 11 moves with the force reduction connecting arm 204 and can realize the connection or disconnection of the two power supplies of the dual power supply solid-sealed pole 11. An interlocking mechanism 30 is arranged between the common power supply operating mechanism 20 and the backup power supply operating mechanism 21. The interlocking mechanism 30 can prevent the common power supply operating mechanism 20 and the backup power supply operating mechanism 21 from performing the closing action at the same time. The number of the dual power supply solid-sealed poles 11 is 3, and the three dual power supply solid-sealed poles 11 are arranged side by side and spaced apart on one side of the mechanism frame 10.

[0013] like Figure 3As shown, the interlocking mechanism 30 includes a spare interlocking crank arm 31 which is interlockedly arranged on the opening and closing main shaft 201 of the normal power operating mechanism 20, a spare locking connecting rod 32 which is interlockedly arranged with the spare interlocking crank arm 31, a normal interlocking crank arm 33 which is interlockedly arranged on the opening and closing main shaft 201 of the standby power operating mechanism 21, and a normal locking connecting rod 34 which is interlockedly arranged with the normal interlocking crank arm 33, one end of the spare locking connecting rod 32 is provided with a first driving protrusion 321 which is interlockedly cooperated with the spare closing latch 211 of the standby power operating mechanism 21, and one end of the normal locking connecting rod 34 is provided with a second driving protrusion 341 which is interlockedly cooperated with the normal closing latch 206 of the normal power operating mechanism 20. An interlocking mechanism is provided between the common power operating mechanism and the backup power operating mechanism, so as to prevent the common power operating mechanism and the backup power operating mechanism from performing the closing action at the same time, which is beneficial to improving the safety performance of the dual power vacuum circuit breaker. During operation, when the common power operating mechanism is in the closing state, the backup locking link abuts against the backup closing latch. At this time, the backup power operating mechanism is in the opening state and cannot perform the closing action; only when the common power operating mechanism is in the opening state, the backup locking link is unlocked, and the backup power operating mechanism adopts the closing action. When the backup power operating mechanism is in the closing state, the common locking link abuts against the common closing latch. At this time, the common power operating mechanism is in the opening state and cannot perform the closing action. A first spring seat 207 is provided on the force reducing connecting arm 204 at one end corresponding to the opening spring 205, and a second spring seat 208 is provided on the mechanism frame 10 at the other end corresponding to the opening spring 205. Both ends of the opening spring 205 are respectively arranged in the first spring seat 207 and the second spring seat 208. The opening spring can enhance the opening force of the common power supply operating mechanism and the backup power supply operating mechanism, which is beneficial to improving the breaking capacity of the dual power supply vacuum circuit breaker.The dual power supply sealed pole 11 includes an insulating column 111 arranged on the mechanism frame 10, a first insulating pull rod 112 arranged in linkage with the force reduction arm 204 of the common power supply operating mechanism 20, a first conductive block 113, a first vacuum interrupter 114, a conductive clamp 115, a second vacuum interrupter 116, a second conductive block 117, and a second insulating pull rod 118 arranged in linkage with the force reduction arm 204 of the backup power supply operating mechanism 21, the first insulating pull rod 112, the first conductive block 113, the first vacuum interrupter 114, the conductive clamp 115, The second vacuum interrupter 116, the second conductive block 117, and the second insulating rod 118 are sequentially arranged in the insulating column 111 from top to bottom. The first moving contact in the first vacuum interrupter 114 cooperates with the first insulating rod 112, and the second moving contact in the second vacuum interrupter 116 cooperates with the second insulating rod 118. The insulating column 111 is respectively provided with a common power supply incoming line contact 12, an outgoing line contact 13, and a standby power supply contact 14 electrically connected to the first conductive block 113, the conductive clip 115, and the second conductive block 117. The first vacuum interrupter and the second vacuum interrupter are respectively arranged on the dual power supply sealed pole. The common power supply operating mechanism and the standby power supply operating mechanism drive the first vacuum interrupter and the second vacuum interrupter respectively through the insulating rod, so as to realize the control of the connection or disconnection of the two power supply circuits of the dual power supply sealed pole.

[0014] The force reduction arm of the common power operating mechanism and the backup power operating mechanism adopts a lever-type structure to drive the dual power sealed pole, which can achieve the output of the operating force of the common power operating mechanism and the backup power operating mechanism, which is conducive to speeding up the closing speed, and the force reduction arm is provided with a gate opening spring. When opening, the gate opening spring releases energy, and the gate opening speed is faster, which is conducive to improving the breaking capacity of the dual power vacuum circuit breaker. And the dual power vacuum circuit breaker has the advantages of simple structure, stable and reliable performance, compact structure, high safety, and high breaking capacity.

Claims

1. A dual-power vacuum circuit breaker, comprising a mechanism frame, at least one dual-power sealed pole arranged on one side of the mechanism frame and having two power supply circuits, a common power operating mechanism and a backup power operating mechanism symmetrically arranged on the mechanism frame and used to drive the dual-power sealed pole to turn on and off, characterized in that: The common power supply operating mechanism and the backup power supply operating mechanism both include a circuit breaker operating module, a switching main shaft linked with the circuit breaker operating module, a crank arm linked with the switching main shaft, a connecting plate linked with the crank arm, and a force reduction connecting arm rotatably arranged on the mechanism frame at the corresponding connecting plate, one end of the force reduction connecting arm is arranged on the connecting plate, and the connecting plate and the force reduction connecting arm are linked together, and a switching spring is arranged between the end of the force reduction connecting arm close to the connecting plate and the mechanism frame, and the force reduction connecting arms of the common power supply operating mechanism and the backup power supply operating mechanism are respectively linked and arranged on the two ends of the dual power supply sealed pole, and the dual power supply sealed pole moves with the force reduction connecting arm and can realize the connection or disconnection of the two power supplies of the dual power supply sealed pole, and an interlocking mechanism is arranged between the common power supply operating mechanism and the backup power supply operating mechanism, and the interlocking mechanism can prevent the common power supply operating mechanism and the backup power supply operating mechanism from performing the closing action at the same time; The interlocking mechanism comprises a spare interlocking crank arm linked to the opening and closing main shaft of the common power operating mechanism, a spare locking connecting rod linked to the spare interlocking crank arm, a common interlocking crank arm linked to the opening and closing main shaft of the spare power operating mechanism, and a common locking connecting rod linked to the common interlocking crank arm, one end of the spare locking connecting rod is provided with a first driving protrusion linked to the spare closing pawl of the spare power operating mechanism, and one end of the common locking connecting rod is provided with a second driving protrusion linked to the common closing pawl of the common power operating mechanism; A first spring seat is arranged on the force reducing connecting arm at one end corresponding to the opening spring, and a second spring seat is arranged on the mechanism frame at the other end corresponding to the opening spring, and both ends of the opening spring are arranged in the first spring seat and the second spring seat respectively; The dual power sealed pole includes an insulating column arranged on a mechanism frame, a first insulating pull rod arranged in linkage with a force reducing link arm of a common power operating mechanism, a first conductive block, a first vacuum arc extinguishing chamber, a conductive clamp, a second vacuum arc extinguishing chamber, a second conductive block, and a second insulating pull rod arranged in linkage with a force reducing link arm of a backup power operating mechanism. The first insulating pull rod, the first conductive block, the first vacuum arc extinguishing chamber, the conductive clamp, the second vacuum arc extinguishing chamber, the second conductive block, and the second insulating pull rod are arranged in sequence from top to bottom in the insulating column. The first moving contact in the first vacuum arc extinguishing chamber cooperates with the first insulating pull rod, and the second moving contact in the second vacuum arc extinguishing chamber cooperates with the second insulating pull rod. The insulating column is respectively provided with a common power incoming line contact, an outgoing line contact, and a backup power contact electrically connected to the first conductive block, the conductive clamp, and the second conductive block.

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