Mechanical lock for circuit breaker

Abstract

The utility model relates to the technical field of mechanical locks, and discloses a mechanical lock for a circuit breaker, which comprises a mounting seat, a rotating shaft, a first connecting assembly, a second connecting assembly and a limiting piece, and is characterized in that the first connecting assembly and the second connecting assembly are respectively arranged at two ends of the rotating shaft; the first connecting assembly and the second connecting assembly are arranged in a central symmetry mode with the rotating shaft center as the symmetry center. The limiting piece comprises a connecting piece, a first blocking rod and a second blocking rod, and the first blocking rod and the second blocking rod are fixedly connected through the connecting piece; the limiting piece is installed on the front side of the installation base and can slide left and right relative to the installation base, and therefore the first crank or the second crank is selectively limited to swing forwards. By adopting the mechanical locking device, the unexpected circuit breaker switching-on condition caused by the fact that an electrical worker pulls a circuit breaker brake handle by mistake in the operation process can be effectively avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical locks, in particular to a mechanical lock for a circuit breaker. Background Art

[0002] Mechanical interlocking refers to a type of structural component that uses mechanical transmission to perform interlocking control between electrical equipment. The working principle is: when the mechanical transmission reaches a specified position, it will cause the machine connected to it to move, or restrict its movement, or lock it, etc., that is, this mechanical action causes changes in the machine connected to it.

[0003] In order to meet the demand for uninterrupted power supply during line power supply, power distribution users are usually equipped with more than two independent power supply devices. However, if two power supplies are supplied to the load at the same time, it will cause serious line problems. Mechanical interlocks for circuit breakers are mainly used in dual power supply circuits to ensure that the two circuit breakers cannot be closed and energized at the same time. When one of the circuit breakers is in the closed state, the interlocked circuit breaker cannot be closed, thus avoiding short circuit failures caused by circuit misoperation.

[0004] The Chinese patent with the announcement number CN219553460U discloses an electrical interlock for electrical maintenance, including a circuit breaker, a connecting assembly, a rotating seat, a mounting member and a base plate, wherein the circuit breaker is arranged in a cooperative connection with the connecting assembly. When the knife handle of one of the circuit breakers is closed, the knife handle on the other circuit breaker remains in an open state due to the cooperative connection of the connecting assembly. The electrical interlock for electrical maintenance can prevent the two circuit breakers from being closed at the same time through the design of the connecting assembly, thereby improving the safety of electricity use. However, when using the electrical interlock, the circuit breaker knife handle can be directly pulled to operate, which may cause the electrician to close the circuit breaker unexpectedly during the operation. In addition, during the maintenance process, the circuit breaker state may change due to accidental touching of the knife handle, which poses a great safety hazard. Therefore, a new type of mechanical interlock for circuit breakers is urgently needed to solve these problems. Utility Model Content

[0005] In view of the above deficiencies in the prior art, the utility model provides a mechanical lock for a circuit breaker. By designing a limiter that can slide left and right relative to a mounting seat, the locking device can selectively limit the first crank or the second crank from swinging forward, thereby improving operational safety and reducing the risk of misoperation.

[0006] The utility model discloses a mechanical lock for a circuit breaker, comprising a mounting seat and a rotating shaft rotatably connected to the mounting seat, and also comprising a first connecting component, a second connecting component and a limiting member.

[0007] The first connecting component and the second connecting component are respectively arranged at two ends of the rotating shaft, and the first connecting component and the second connecting component are centrally symmetrically arranged with the center of the rotating shaft as the symmetry center, and the first connecting component and the second connecting component are respectively located on the left and right sides of the mounting seat;

[0008] The first connecting assembly comprises a first crank and a first connecting rod, wherein the first crank is fixedly connected to the rotating shaft, the first connecting rod is rotatably connected to the first crank, and a first connecting ring is provided at the right end of the first connecting rod; the second connecting assembly comprises a second crank and a second connecting rod, wherein the second crank is fixedly connected to the rotating shaft, the second connecting rod is rotatably connected to the second crank, and a second connecting ring is provided at the left end of the second connecting rod;

[0009] The limit member includes a connecting member, a first gear rod and a second gear rod, and the first gear rod and the second gear rod are fixedly connected by the connecting member; the limit member is installed on the front side of the support seat, and the limit member can slide left and right relative to the mounting seat, thereby selectively limiting the first crank or the second crank from swinging forward.

[0010] Furthermore, the mounting seat is provided with a first mounting block and a second mounting block, the first mounting block is provided with a first adjustment hole, the second mounting block is provided with a second adjustment hole, the first gear lever is slidably matched with the first adjustment hole, and the second gear lever is slidably matched with the second adjustment hole.

[0011] Furthermore, the first connecting assembly further comprises a first sleeve fixed on the first crank, the first connecting rod is sleeved in the first sleeve, and the first connecting rod can rotate and slide axially relative to the first sleeve;

[0012] The second connecting assembly also includes a second sleeve fixed on the second crank, the second connecting rod is sleeved in the second sleeve, and the second connecting rod can rotate and slide axially relative to the second sleeve.

[0013] Furthermore, the mounting seat includes a base and a support seat, and the rotating shaft is arranged on the support seat.

[0014] Furthermore, the base is in a rectangular shape, and mounting holes are provided at the four corners of the base.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) The limiter can slide left and right relative to the mounting base, thereby selectively limiting the first crank or the second crank from swinging forward. With this design, when choosing to close the first circuit breaker or the second circuit breaker, it is necessary to first slide the limiter and then pull the gate handle of the first circuit breaker or the gate handle of the second circuit breaker, and the operation of sliding the limiter will not directly lead to unexpected closing of the circuit breaker. Therefore, this can effectively avoid unexpected closing of the circuit breaker due to the electrician's mistaken pulling of the circuit breaker gate handle during operation.

[0017] (2) During the maintenance process, the limiter can selectively limit the forward swing of the first crank or the second crank. Combined with the linkage of the gate handle of the first circuit breaker and the gate handle of the second circuit breaker, it can effectively prevent the circuit breaker state from changing due to accidental touching of the gate handle, thereby eliminating safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of Example 1;

[0019] Figure 2 for Figure 1 A schematic diagram of the structure of the middle limiter;

[0020] Figure 3 for Figure 1 A schematic diagram of the structure of the first mounting block;

[0021] Figure 4 for Figure 1 Schematic diagram of the structure of the first connection component.

[0022] In the figure, 1-rotating shaft, 2-limiting member, 201-connecting member, 202-first gear rod, 203-second gear rod, 301-first crank, 302-first connecting rod, 303-first sleeve, 304-first retaining ring, 305-first limiting protrusion, 306-first connecting ring, 401-second crank, 402-second connecting rod, 403-second sleeve, 404-second connecting ring, 501-first circuit breaker, 502-second circuit breaker, 503-gate handle of the first circuit breaker, 504-gate handle of the second circuit breaker, 6-first mounting block, 601-first adjusting hole, 7-second mounting block, 8-base, 801-mounting hole, 9-support seat. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0024] For the description of the required spatial relationship, three orthogonal directions of "front and back", "left and right", and "up and down (or vertical)" can be defined, and the spatial rectangular coordinate system can be defined through the relative position relationship.

[0025] Figure 1 to Figure 4 Embodiment 1 of the present utility model is shown.

[0026] like Figure 1 As shown, the utility model discloses a mechanical interlock for a circuit breaker suitable for linkage of a first circuit breaker 501 and a second circuit breaker 502. The first circuit breaker 501 and the second circuit breaker 502 are two circuit breakers arranged in parallel in a dual power supply circuit. The first circuit breaker 501 is provided with a gate handle 503 of the first circuit breaker. When the gate handle 503 of the first circuit breaker is moved forward to the closing position, the first circuit breaker 501 is energized; when the gate handle 503 of the first circuit breaker is moved backward to the opening position, the first circuit breaker 501 is de-energized. The second circuit breaker 502 is provided with a gate handle 504 of the second circuit breaker. When the gate handle 502 of the second circuit breaker is moved forward to the closing position, the second circuit breaker 502 is energized; when the gate handle 504 of the second circuit breaker is moved backward to the opening position, the second circuit breaker 502 is de-energized.

[0027] The mechanical lock for circuit breaker is installed between the first circuit breaker 501 and the second circuit breaker 502 , and the mechanical lock for circuit breaker includes a mounting seat, a rotating shaft 1 , a first connecting assembly, a second connecting assembly and a limiting member 2 .

[0028] The mounting base includes a base 8 and a support base 9, and the base 8 and the support base 9 can be connected by bolts, or by the connection method disclosed in the patent document with the announcement number CN219553460U. The base 8 is in the shape of a rectangular parallelepiped, and mounting holes 801 are provided at the four corners of the base 8, and the mounting holes 801 are used to install the base 8 in the distribution box.

[0029] The rotating shaft 1 is rotatably connected to the support seat 9, and the first connecting component and the second connecting component are respectively arranged at both ends of the rotating shaft 1, and the first connecting component and the second connecting component are centrally symmetrically arranged with the center of the rotating shaft 1 as the symmetry center, and the first connecting component and the second connecting component are respectively located on the left and right sides of the mounting seat.

[0030] The first connecting assembly includes a first crank 301 and a first connecting rod 302. The first crank 301 is fixedly connected to the rotating shaft 1, and the first connecting rod 302 is rotatably connected to the first crank 301. A first connecting ring 306 is provided at the right end of the first connecting rod 302, and the first connecting ring 306 is slidably connected to the gate handle 503 of the first circuit breaker. The second connecting assembly includes a second crank 401 and a second connecting rod 402. The second crank 401 is fixedly connected to the rotating shaft 1, and the second connecting rod 402 is rotatably connected to the second crank 401. A second connecting ring 404 is provided at the left end of the second connecting rod 402, and the second connecting rod 402 is slidably connected to the gate handle 504 of the second circuit breaker.

[0031] Preferably, Figure 4 As shown, in order to meet the adaptation requirements of different spacings between the first circuit breaker 501 and the second circuit breaker 502, the first crank 301 is provided with a first sleeve 303, and the first sleeve 303 can be fixed to the first crank 301 by welding or bolting. The first connecting rod 302 is sleeved in the first sleeve 303, and the first connecting rod 302 can rotate and slide axially relative to the first sleeve 303. The first sleeve 303 is provided with a first limiting ring 304, and the first connecting rod 302 is provided with a first limiting protrusion 305 adapted to the first limiting ring 304, and the first limiting ring 304 blocks the first limiting protrusion 305 to prevent the first connecting rod 302 from being separated from the first sleeve 303. Similarly, the second crank 401 is provided with a second sleeve 403, and the second sleeve 403 can be fixed to the second crank 401 by welding or bolting. The connection mode and matching relationship between the second connecting rod 402 and the second sleeve 403 are the same as those between the first connecting rod 302 and the first sleeve 303, and will not be described again here.

[0032] The position-limiting member 2 comprises a connecting member 201, a first gear rod 202 and a second gear rod 203, wherein the first gear rod 202 and the second gear rod 203 are fixedly connected by the connecting member 201. Preferably, the position-limiting member 2 is in a Z-shape. Specifically, the first gear rod 202 and the first gear rod 203 are rods extending in the left-right direction and arranged at intervals, and the connecting member 201 is an inclined rod, and its two ends are respectively connected to the first gear rod 202 and the first gear rod 203. The position-limiting member 2 is integrally formed.

[0033] The position-limiting member 2 is installed on the front side of the support seat 9, and the position-limiting member 2 can slide left and right relative to the support seat 9. Specifically, the support seat 9 is provided with a first mounting block 6 and a second mounting block 7, the first mounting block 6 is provided with a first adjustment hole 601, the second mounting block 7 is provided with a second adjustment hole, the first gear lever 202 is slidably matched with the first adjustment hole 601, and the second gear lever 203 is slidably matched with the second adjustment hole.

[0034] The limiting member is used to selectively limit the first crank 301 or the second crank 401 from swinging forward. When the limiting member 2 is slid to the right until the first gear rod 202 is located in front of the first crank 301, the first gear rod 202 can limit the first crank 301 from swinging forward, and the second gear rod 203 does not limit the second crank 401 from swinging forward; when the limiting member 2 is slid to the left until the second gear rod 203 is located in front of the second crank 401, the second gear rod 203 can limit the second crank 401 from swinging forward, and the first gear rod 202 does not limit the first crank 301 from swinging forward.

[0035] In the specific design, the minimum distance between the first gear lever 202 and the axis of the rotating shaft 1 is smaller than the maximum distance between the first crank 301 and the axis of the rotating shaft 1 , and the minimum distance between the second gear lever 203 and the axis of the rotating shaft 1 is smaller than the maximum distance between the second crank 401 and the axis of the rotating shaft 1 .

[0036] The working principle of this embodiment is as follows:

[0037] See also Figure 1 When the second circuit breaker 502 needs to be opened and the first circuit breaker 501 needs to be closed, the limiter 2 is slid to the left to make the second lever 203 located in front of the second crank 401, and at the same time, the restriction of the first lever 202 on the forward rotation of the first crank 301 is released. Subsequently, the gate handle 503 of the first circuit breaker is pulled forward until the first circuit breaker 501 is in the closed state. At this time, the gate handle 504 of the second circuit breaker swings backward under the linkage of the rotating shaft 1, the first connecting component and the second connecting component, so that the second circuit breaker 502 is in the open state. Since the second lever 203 is located in front of the second crank 401, it can limit the second crank 401 from swinging forward. Therefore, during the maintenance process, even if the gate handle of any circuit breaker is accidentally touched, the second circuit breaker 502 will not be closed, eliminating the safety hazard during maintenance.

[0038] When the first circuit breaker 501 needs to be opened and the second circuit breaker 502 needs to be closed, the gate handle 504 of the second circuit breaker is pulled forward. When the gate handle 504 of the second circuit breaker is adjusted to be in the middle position of the second circuit breaker 502 (such as Figure 1 When the first lever 202 is in the state of the gate handle 504 of the second circuit breaker, the limiter 2 is slid to the right to make the first lever 202 located in front of the first crank 301, and the restriction of the second lever 203 on the forward rotation of the second crank 401 is released. Then, the gate handle 504 of the second circuit breaker is continued to be pulled until the second circuit breaker 502 is in the closed state. At this time, the gate handle 503 of the first circuit breaker swings backward under the linkage action of the rotating shaft 1, the first connecting assembly and the second connecting assembly, so that the first circuit breaker 501 is in the open state. Since the first lever 202 is located in front of the first crank 301, it can limit the forward rotation of the first crank 301. Therefore, during the maintenance process, even if the gate handle on any circuit breaker is accidentally touched, it will not cause the first circuit breaker 501 to be closed, eliminating the safety hazard during maintenance.

Claims

1. A mechanical lock for a circuit breaker, comprising a mounting seat and a rotating shaft (1) rotatably connected to the mounting seat, characterized in that: It also includes a first connecting component, a second connecting component and a limiting member (2), The first connecting component and the second connecting component are respectively arranged at two ends of the rotating shaft (1), and the first connecting component and the second connecting component are centrally symmetrically arranged with the center of the rotating shaft (1) as the symmetry center, and the first connecting component and the second connecting component are respectively located on the left and right sides of the mounting seat; The first connecting assembly comprises a first crank (301) and a first connecting rod (302), wherein the first crank (301) is fixedly connected to the rotating shaft (1), the first connecting rod (302) is rotatably connected to the first crank (301), and a first connecting ring (306) is provided at the right end of the first connecting rod (302); the second connecting assembly comprises a second crank (401) and a second connecting rod (402), wherein the second crank (401) is fixedly connected to the rotating shaft (1), the second connecting rod (402) is rotatably connected to the second crank (401), and a second connecting ring (404) is provided at the left end of the second connecting rod (402); The limiting member (2) comprises a connecting member (201), a first gear rod (202) and a second gear rod (203), wherein the first gear rod (202) and the second gear rod (203) are fixedly connected via the connecting member (201); the limiting member (2) is mounted on the front side of the mounting seat, and the limiting member (2) can slide left and right relative to the mounting seat, thereby selectively limiting the first crank (301) or the second crank (401) from swinging forward.

2. The mechanical lock for a circuit breaker according to claim 1, characterized in that: The mounting seat is provided with a first mounting block (6) and a second mounting block (7); the first mounting block (6) is provided with a first adjustment hole (601); the second mounting block (7) is provided with a second adjustment hole; the first gear lever (202) is slidably matched with the first adjustment hole (601); and the second gear lever (203) is slidably matched with the second adjustment hole.

3. The mechanical lock for a circuit breaker according to claim 1, characterized in that: The first connecting assembly further comprises a first sleeve (303) fixedly mounted on the first crank (301), the first connecting rod (302) being sleeved in the first sleeve (303), and the first connecting rod (302) being capable of rotating and axially sliding relative to the first sleeve (303); The second connecting assembly also includes a second sleeve (403) fixed on the second crank (401), the second connecting rod (402) is sleeved in the second sleeve (403), and the second connecting rod (402) can rotate and slide axially relative to the second sleeve (403).

4. The mechanical lock for a circuit breaker according to claim 1, characterized in that: The mounting seat comprises a base (8) and a support seat (9), and the rotating shaft (1) is arranged on the support seat (9).

5. The mechanical lock for a circuit breaker according to claim 4, characterized in that: The base (8) is in the shape of a rectangular parallelepiped, and mounting holes (801) are provided at the four corners of the base (8).

Images