Interlocking mechanism between circuit breaker, disconnector and earthing switch

Abstract

The present invention provides an interlocking mechanism for a circuit breaker, an isolating switch and an earthing switch, which includes an isolating shaft and an earthing shaft, wherein the isolating shaft is connected to the isolating switch through an isolating operating mechanism, and the earthing shaft is connected to the earthing switch through an earthing operating mechanism, wherein the isolating shaft sleeve is provided with a closing interlocking plate that cooperates with the isolating shaft, and the earthing interlocking plate that cooperates with the earthing shaft sleeve is provided with a earthing interlocking plate that cooperates with the earthing interlocking plate, wherein the lower end of the closing interlocking plate is provided with a first latching part, and the upper end of the earthing interlocking plate is provided with a second latching part, and an interlocking roller is provided between the first latching part and the second latching part, wherein the interlocking roller has a first state of limited position cooperation with the earthing interlocking plate when the first latching part is pressed, and a second state of limited position cooperation with the closing interlocking plate when the second latching part is pressed. Through the design of the latching part and the interlocking roller of the closing interlocking plate, the interlocking of the earthing switch and the isolating switch can be realized to avoid misoperation.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum circuit breakers, and in particular to an interlocking mechanism between a circuit breaker and an isolating switch and a grounding switch. Background Art

[0002] Vacuum circuit breakers are circuit breakers that use vacuum as the insulating and arc-extinguishing medium between contacts. They are widely used in distribution networks due to their small size and light weight. Many industrial and mining enterprises, power plants, and substations use vacuum circuit breakers for the protection and control of electrical equipment.

[0003] When the vacuum circuit breaker is in the closed state, the grounding switch cannot be grounded, otherwise it may cause accidents. Therefore, it is very important to develop an interlocking mechanism between the circuit breaker, the isolating switch and the grounding switch to ensure that the grounding switch will not be closed by mistake in the closed state. Summary of the invention

[0004] In order to overcome the above technical deficiencies, the present invention provides an interlocking mechanism between a circuit breaker and an isolating switch and a grounding switch.

[0005] The present invention provides an interlocking mechanism for a circuit breaker, an isolating switch and an earthing switch, comprising an isolating shaft and an earthing shaft, wherein the isolating shaft is connected to the isolating switch via an isolating operating mechanism, and the earthing shaft is connected to the earthing switch via an earthing operating mechanism, the isolating shaft sleeve is provided with a closing interlocking plate which cooperates with the isolating shaft, the earthing shaft sleeve is provided with an earthing interlocking plate which cooperates with the earthing interlocking plate, a first latching portion is provided at the lower end of the closing interlocking plate, a second latching portion is provided at the upper end of the earthing interlocking plate, an interlocking roller is provided between the first latching portion and the second latching portion, and the interlocking roller has a first state in which the interlocking roller cooperates with the earthing interlocking plate in a limiting manner when the first latching portion is pressed, and a second state in which the interlocking roller cooperates with the closing interlocking plate in a limiting manner when the second latching portion is pressed.

[0006] The upper end of the closing interlocking plate is provided with an interlocking mechanism linked with the circuit breaker operating mechanism.

[0007] Both sides of the upper end of the closing interlocking plate are provided with interlocking grooves which form a limiting match with the interlocking mechanism, and the two interlocking grooves respectively form a limiting match with the interlocking mechanism when closing and opening the switch.

[0008] A displacement groove is provided at the bottom end of the grounding interlocking plate, and a limit pin is provided in the displacement groove. The limit pin can slide along the displacement groove, and the two ends of the displacement groove correspond to the grounding open state and the grounding closed state respectively.

[0009] The interlocking mechanism comprises an interlocking operating mechanism which cooperates with a interlocking rod. The interlocking rod is driven by the interlocking operating mechanism to have a first state of being limited with a closing interlocking plate and a second state of being released from being limited with the closing interlocking plate.

[0010] The interlocking operating mechanism comprises an operating shaft, an interlocking crank arm linked with the operating shaft, a gate-opening roller linked with the operating shaft, and a gate-opening cam linked with the gate-opening roller. The interlocking crank arm is linked with a locking rod.

[0011] The interlocking operating mechanism is also provided with an auxiliary switch, and the auxiliary switch is linked with the operating shaft through a connecting rod mechanism.

[0012] The interlocking operating mechanism is also provided with a interlocking plate, which is linked with the operating shaft through a buffer crank arm. The interlocking plate has a first state in which it forms a limiting cooperation with the lock plate on the surface of the box body when the interlocking rod is extended, and a second state in which it releases the limiting cooperation with the lock plate on the surface of the box body when the interlocking rod is retracted.

[0013] The closing interlocking plate is provided with a guide groove, and a guide pin shaft is provided in the guide groove.

[0014] The beneficial effects of the present invention are as follows: through the design of the latch part and the interlocking roller of the closing interlocking plate, when closing the switch, the latch part of the closing interlocking plate causes the interlocking roller to form a limit fit with the latch part of the grounding interlocking plate, so that the grounding interlocking plate can be locked to prevent the grounding switch from being misoperated in the closed state. Only in the open state will the locked state of the grounding interlocking plate be released and safe operation can be performed. At the same time, when the grounding switch is closed, the latch part of the grounding interlocking plate causes the interlocking roller to form a limit fit with the closing interlocking plate, so that the isolating switch can be prevented from being misoperated after the grounding switch is closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the grounding state of the present invention.

[0016] Figure 2 It is a schematic diagram of the isolated state of the present invention.

[0017] Figure 3 It is a schematic diagram of the isolated and grounded states of the present invention.

[0018] Figure 4 It is a structural schematic diagram of a closing interlocking plate and a grounding interlocking plate of the present invention.

[0019] Figure 5 It is a rear view of the present invention.

[0020] Figure 6 yes Figure 5 A magnified schematic diagram of center A.

[0021] Figure 7 It is a partially enlarged schematic diagram of the interlocking operating mechanism of the present invention.

[0022] Figure 8It is a structural schematic diagram of the closing interlocking plate of the present invention.

[0023] Fig. 9 It is a structural schematic diagram of the grounding interlocking plate of the present invention.

[0024] Fig.10 It is a structural schematic diagram of the interlocking plate and the locking plate of the present invention. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0026] As shown in the figure, the present invention provides an interlocking mechanism of a circuit breaker, an isolating switch and an earthing switch, which includes an isolating shaft 4 and an earthing shaft 7. The isolating shaft 4 is connected to the isolating switch through an isolating operating mechanism. The isolating operating mechanism includes a first isolating crank arm 21 that cooperates with the isolating shaft 4. The first isolating crank arm 21 is connected to the second isolating crank arm 23 through an isolating linkage shaft 22. The second isolating crank arm 23 is connected to the isolating shaft I1. The isolating shaft I1 cooperates with the isolating blade 9, and the isolating shaft I1 is connected to a tension spring through a third isolating crank arm 24. The other end of the tension spring is fixed to the housing.

[0027] The grounding shaft 7 is connected to the grounding switch 8 through a grounding operating mechanism. The grounding operating mechanism includes a grounding crank arm that cooperates with the grounding shaft. The grounding crank arm is connected to the housing through a tension spring.

[0028] The isolating shaft 4 is sleeved with a closing interlock plate 3 which cooperates with it, the grounding shaft 7 is sleeved with a grounding interlock plate 6 which cooperates with it, and the lower end of the closing interlock plate 3 is provided with a first latch part 18, and the first latch part 18 is a structure with one end recessed and the other end protruding.

[0029] The upper end of the grounding interlocking plate 6 is provided with a second latch portion 20 , which is also a structure with one end recessed and the other end protruding.

[0030] A locking roller 5 is provided between the first locking portion 18 and the second locking portion 20 , and one end of the locking roller 5 is hinged to the housing.

[0031] The interlocking roller 5 has a first state in which it cooperates with the grounding interlocking plate 6 when the first latch portion 18 is pressed, and a second state in which it cooperates with the closing interlocking plate 3 when the second latch portion 20 is pressed.

[0032] When the isolating switch is closed, the closing interlock plate 3 is driven to rotate by the isolating shaft 4. At the same time, the protrusion of the first latch portion 18 of the closing interlock plate 3 presses the interlock roller into the depression of the second latch portion 20 of the grounding interlock plate. Since the first latch portion 18 presses against the interlock roller, the grounding interlock plate is limited by the interlock roller 5 and cannot rotate. At this time, the grounding switch cannot be operated.

[0033] When the isolating switch is opened, the closing interlock plate 3 is rotated by the isolating shaft, and the protrusion of the first latch part 18 of the closing interlock plate 3 leaves the upper end of the interlock roller 5. At this time, the limit of the interlock roller 5 on the grounding interlock plate is released. At this time, the grounding interlock plate can be selected, so the grounding switch can be operated.

[0034] When the grounding switch is closed, the grounding shaft 7 drives the grounding interlock plate to rotate. At this time, the protrusion of the second latch part of the grounding interlock plate presses the interlock roller upward, so that the interlock roller is embedded in the recess of the first latch part of the closing interlock plate, thereby realizing the limiting of the closing interlock plate by the interlock roller, so that the isolating switch cannot be operated.

[0035] The upper end of the closing interlocking plate is provided with an interlocking mechanism linked with the circuit breaker operating mechanism. The interlocking mechanism can limit the closing interlocking plate when the disconnector is opened or closed, so as to avoid misoperation during opening or closing.

[0036] Both sides of the upper end of the closing interlock plate 3 are provided with interlock grooves 16 that form a limit fit with the interlock mechanism, and the two interlock grooves 16 form a limit fit with the interlock mechanism when closing and opening the switch, respectively. That is, the interlock mechanism is used to achieve two state restrictions, that is, when the switch is closed, the interlock mechanism limits the closing interlock plate so that it cannot be opened manually, or when the switch is opened, the interlock mechanism limits the closing interlock plate so that it cannot be closed manually.

[0037] The closing interlock plate 3 is provided with a guide groove 17, in which a guide pin shaft 10 is provided. The guide groove 17 is an arc-shaped structure, distributed with the isolation shaft as the center, and limits the movement trajectory of the closing interlock plate.

[0038] A displacement groove 19 is provided at the bottom end of the grounding interlocking plate, and a limit pin 11 is provided in the displacement groove 19. The limit pin 11 can slide along the displacement groove, and the two ends of the displacement groove 19 correspond to the two states of grounding open and grounding closed respectively, and are distributed in an arc with the grounding axis as the center, so as to limit the moving trajectory of the grounding interlocking plate.

[0039] The interlocking mechanism includes an interlocking operating mechanism that cooperates with the interlocking rod 2. The interlocking rod is driven by the interlocking operating mechanism to have a first state of limiting with the closing interlocking plate and a second state of releasing the limiting with the closing interlocking plate. The interlocking rod can be pulled, extended or retracted by the interlocking operating mechanism, thereby limiting and releasing the limiting of the closing interlocking plate.

[0040] The interlocking operating mechanism includes an operating shaft 25, which is directly used to control the operating mechanism in the phase pole, and an interlocking crank arm 14 is arranged on the operating shaft 25, and the interlocking crank arm 14 is connected to the interlocking rod 2, and is used to drive the interlocking rod 2 to move, and a trip roller 15 is arranged on the operating shaft, and a trip cam 12 is arranged correspondingly at the upper end of the trip roller 15. When the trip cam 12 rotates, it will touch the trip roller, driving the operating shaft to rotate, so that the interlocking rod retracts and releases the limit on the closing interlocking plate, that is, after the automatic opening, the locking of the interlocking rod is released, and the disconnector can be manually opened and closed to avoid human operation in the closed state.

[0041] At the same time, the interlocking operating mechanism is also provided with an auxiliary switch, which is linked to the operating shaft through a connecting rod mechanism. The connecting rod mechanism includes an auxiliary switch crank arm linked to the auxiliary switch. The auxiliary switch crank arm is linked to the crank arm arranged on the operating shaft through a connecting rod. The extension and retraction operations of the interlocking rod can also be realized by using the auxiliary switch.

[0042] The interlocking operating mechanism is also provided with an interlocking plate 13, which is linked with the operating shaft through a buffer crank arm, and has a first state in which the interlocking plate forms a limit fit with the lock plate 26 on the surface of the box body when the interlocking rod is extended, and a second state in which the limit fit with the lock plate on the surface of the box body is released when the interlocking rod is retracted. The interlocking plate is driven by the operating shaft, and a slide groove is provided on it, and a positioning pin is provided in the slide groove, so as to determine the movement trajectory of the interlocking plate. When the interlocking rod is extended to form a limit fit with the closing interlocking plate, the end of the interlocking plate is placed on the upper end of the lock plate, pressing the lock plate to prevent it from opening upward from the outside, so as to avoid someone opening the lock plate manually in the closing state, and only when the interlocking rod is retracted to release the limit state of the closing interlocking plate, the interlocking plate is driven to move inward, and is no longer located in the movement direction of the lock plate, so that the lock plate can be opened for manual closing and opening or grounding operations.

[0043] The embodiments should not be regarded as limiting the present invention, and any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. An interlocking mechanism between a circuit breaker and an isolating switch and a grounding switch, comprising an isolating shaft and a grounding shaft, wherein the isolating shaft is connected to the isolating switch through an isolating operating mechanism, and the grounding shaft is connected to the grounding switch through a grounding operating mechanism, characterized in that: The isolation sleeve is provided with a closing interlock plate which cooperates with it, and the grounding shaft is sleeved with a grounding interlock plate which cooperates with it. The lower end of the closing interlock plate is provided with a first latch part, and the upper end of the grounding interlock plate is provided with a second latch part. A interlocking roller is provided between the first latch part and the second latch part. The interlocking roller has a first state in which it cooperates with the grounding interlock plate in a limiting manner when the first latch part is pressed, and a second state in which it cooperates with the closing interlock plate in a limiting manner when the second latch part is pressed.

2. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 1, characterized in that: The upper end of the closing interlocking plate is provided with an interlocking mechanism linked with the circuit breaker operating mechanism.

3. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 1, characterized in that: Both sides of the upper end of the closing interlocking plate are provided with interlocking grooves which form a limiting match with the interlocking mechanism, and the two interlocking grooves respectively form a limiting match with the interlocking mechanism when closing and opening the switch.

4. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 1, characterized in that: A displacement groove is provided at the bottom end of the grounding interlocking plate, and a limit pin is provided in the displacement groove. The limit pin can slide along the displacement groove, and the two ends of the displacement groove correspond to the grounding open state and the grounding closed state respectively.

5. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 2, characterized in that: The interlocking mechanism comprises an interlocking operating mechanism which cooperates with a interlocking rod. The interlocking rod is driven by the interlocking operating mechanism to have a first state of being limited with a closing interlocking plate and a second state of being released from being limited with the closing interlocking plate.

6. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 5, characterized in that: The interlocking operating mechanism comprises an operating shaft, an interlocking crank arm linked with the operating shaft, a gate-opening roller linked with the operating shaft, and a gate-opening cam linked with the gate-opening roller. The interlocking crank arm is linked with a locking rod.

7. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 6, characterized in that: The interlocking operating mechanism is also provided with an auxiliary switch, and the auxiliary switch is linked with the operating shaft through a connecting rod mechanism.

8. The interlocking mechanism of the circuit breaker, disconnector and earthing switch according to claim 6 or 7, characterized in that: The interlocking operating mechanism is also provided with a interlocking plate, which is linked with the operating shaft through a buffer crank arm. The interlocking plate has a first state in which it forms a limiting cooperation with the lock plate on the surface of the box body when the interlocking rod is extended, and a second state in which it releases the limiting cooperation with the lock plate on the surface of the box body when the interlocking rod is retracted.

9. The interlocking mechanism of the circuit breaker, the isolating switch and the earthing switch according to claim 1 or 3, characterized in that: The closing interlocking plate is provided with a guide groove, and a guide pin shaft is provided in the guide groove.

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