CN117133562A - Interlocking device for switch cabinet and switch cabinet with interlocking device - Google Patents

Abstract

The application relates to an interlocking device for a switch cabinet and the switch cabinet with the interlocking device, wherein the interlocking device comprises: a door lock member including a main body portion and a lock lever movably mounted to the main body portion, the lock lever being locked to the cabinet door in a closed position; the first end of the first transmission rod is connected to the lock rod, and the second end of the first transmission rod transversely extends to the lower part of the isolation grounding mechanism; a second transmission rod, the first end of which is connected to the first transmission rod and the second end of which extends longitudinally to be opposite to a notch of the isolating grounding mechanism at the grounding position, the second transmission rod being longitudinally provided with a closing interlocking part along the second transmission rod, and the circuit breaker mechanism being configured to allow the closing interlocking part to move when at the closing position; when the lock rod moves to the unlocking position under the action of external force, the first transmission rod drives the second transmission rod to move to the notch of the isolation grounding mechanism, so that when the lock rod moves to the unlocking position, the second end of the second transmission rod moves to the notch of the isolation grounding mechanism, and the lock rod and the cabinet door are unlocked to allow the cabinet door to be opened.

Description

Interlocking device for switch cabinet and switch cabinet with interlocking device

Technical Field

The application relates to the technical field of electrical equipment, in particular to an interlocking device for a switch cabinet and the switch cabinet with the interlocking device.

Background

Switch cabinets, particularly upper isolation lower circuit breaker ring cabinets, are widely used as an important electrical device. In order to ensure personal safety of operators, the upper isolation lower circuit breaker ring main unit requires that a primary line side in the ring main unit can be opened after being grounded when being installed and maintained, and the primary line side can be electrified after the cable chamber door is required to be closed after the overhaul is completed.

Specifically, the isolating switch and the grounding switch of the upper isolating lower circuit breaker ring main unit are generally arranged above the cabinet body, the circuit breaker is arranged below the cabinet body, and when installation and maintenance are carried out, the circuit breaker opening, the isolating switch opening, the grounding switch closing and the circuit breaker closing are required to be operated sequentially, the cable chamber door is opened again, and after maintenance is completed, the cable chamber door is required to be closed, the circuit breaker opening, the grounding switch opening, the isolating switch closing and the circuit breaker closing are required to be operated sequentially. Because the interlocking device is not arranged between the grounding switch and the breaker cable chamber door in the upper isolation lower breaker ring main unit in the prior art, the complex operation is carried out only by operators according to the operation specification, and the defects of operation redundancy and lower reliability of the switch cabinet are obviously caused.

There is therefore a need in the art for an interlock between a ground switch and a cable room door within a switchgear cabinet.

Disclosure of Invention

The present application aims to provide an interlock that solves at least some of the problems described above.

The application also aims to provide a switch cabinet applying the improved interlocking device.

According to an aspect of the present application, there is provided an interlock device for a switchgear including a cabinet body, a cabinet door mounted to the cabinet body, and an isolated grounding mechanism and a circuit breaker operating mechanism housed in the cabinet body, the interlock device being mounted to the cabinet body and including: a door lock member including a main body portion and a lock lever movably mounted to the main body portion, the lock lever being locked to the cabinet door in a closed position; a first transmission rod, a first end of which is connected to the lock rod and a second end of which transversely extends below the isolation grounding mechanism; a second transmission rod, a first end of which is connected to the transverse transmission rod and a second end of which extends longitudinally to be opposite to a notch of the isolating and grounding mechanism at a grounding position, the second transmission rod being longitudinally provided with a closing interlocking part along the second transmission rod, and the circuit breaker mechanism being configured to allow the closing interlocking part to move when at the closing position; when the lock rod moves to the unlocking position under the action of external force, the first transmission rod drives the second transmission rod to move to the notch of the isolation grounding mechanism, so that when the lock rod moves to the unlocking position, the second end of the second transmission rod moves into the notch of the isolation grounding mechanism, and the lock rod and the cabinet door are unlocked to allow the cabinet door to be opened.

Compared with the prior art, the interlocking device can open the cabinet door to maintain and overhaul only under the condition that the isolation grounding mechanism is in the grounding state and the circuit breaker operating mechanism is in the closing state through the door lock component, the first transmission rod and the second transmission rod which are in linkage with each other, and compared with the prior art, the interlocking device is operated only by the experience of operators, and the reliability is greatly improved. In addition, the door lock component, the first transmission rod and the second transmission rod of the interlocking device are simple in structure, small in occupied space in the cabinet body, and the first transmission rod extending transversely can enable the interlocking device to be particularly suitable for a switch cabinet with the isolation grounding mechanism and the breaker operating mechanism not in the same longitudinal plane, so that the applicability is wide.

Preferably, the door lock member further includes a reverse blocking plate elastically mounted to the main body portion, the reverse blocking plate applying a biasing force to the lock lever in the unlocking position to prevent the lock lever from moving toward the locking position.

Preferably, the lock lever is provided with a radially inward concave engagement groove on an outer surface thereof in an axial direction, the engagement groove being engaged to the anti-lock plate when the lock lever is in the unlock position.

Preferably, a brake release interlocking part which is arranged at intervals with the brake closing interlocking part is arranged on the second transmission rod along the axial direction of the second transmission rod, and the brake release interlocking part moves to lock the brake release mechanism of the switch cabinet when the lock rod moves to the unlocking position.

Preferably, the interlocking device for the switch cabinet further comprises a locking plate mounted on the inner side of the cabinet door, and a locking opening allowing the locking rod to pass through when the cabinet door is closed in place is formed in the locking plate.

Preferably, two ends of the first transmission rod are connected to the lock rod and the second transmission rod via crank arms, respectively.

Preferably, the closing interlocking part is fixedly connected to the second transmission rod.

Preferably, the opening interlocking part is rotatably mounted to the second transmission rod.

According to another aspect of the present application, there is provided a switchgear comprising a cabinet body, a cabinet door mounted to the cabinet body, and an isolated grounding mechanism and a circuit breaker operating mechanism housed in the cabinet body, and the aforementioned interlocking device for the switchgear.

Preferably, the isolating grounding switch is a three-position switch.

Additional features and advantages of the application will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following, or may be learned from the practice of the application.

Drawings

Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein:

fig. 1 is a first schematic view of a switchgear cabinet according to the application, with the isolating grounding mechanism in the grounding position, the circuit breaker operating mechanism in the closing position, the interlock in the locking position, the cabinet door closed and partially removed to show detail;

FIG. 2a is a front view of the switch cabinet of FIG. 1, wherein the cabinet door is fully shown;

FIG. 2B is a cross-sectional view of the switch cabinet of FIG. 2a taken along line B-B;

fig. 3 is a second schematic view of the switchgear according to the application, wherein the isolating grounding mechanism is in the grounding position, the circuit breaker operating mechanism is in the closing position, the interlock is in the unlocking position, and the cabinet door is opened;

fig. 4a is a front view of the switch cabinet of fig. 3;

fig. 4b is a side view of the switch cabinet of fig. 3.

Reference numerals illustrate:

100-a switch cabinet; 10-an interlocking device; 11-a door lock member; 111-a main body; 112-locking bar; 112 a-engagement groove; 113-a reverse locking plate; 12-a first transmission rod; 13-a second transmission rod; 131-closing interlocking part; 132-a split interlock; 14-turning arms; 20-isolating the grounding mechanism; 21-notch; 30-a circuit breaker operating mechanism; 40, a cabinet door; 41-locking plate; 42-locking; 50-a brake release mechanism.

Detailed Description

Referring now to the drawings, illustrative aspects of the disclosed switch cabinet and interlock arrangement thereof will be described in detail. Although the drawings are provided to present some embodiments of the application, the drawings are not necessarily to scale and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of part of components in the drawings can be adjusted according to actual requirements on the premise of not affecting the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification do not necessarily refer to all figures or examples.

Certain directional terms used hereinafter to describe the drawings, such as "inner", "outer", "above", "below" and other directional terms, will be understood to have their normal meaning and refer to those directions as they would be when viewing the drawings. Unless otherwise indicated, directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another.

The terms "joined," "connected," and the like as used herein, include both two components being indirectly joined together via an intermediate layer (e.g., an adhesive, a solder, etc.) or an intermediate member (e.g., a connecting member, a transition member, etc.), and also two components being directly joined together without any intermediate layer (e.g., an adhesive, a solder, etc.) or intermediate member (e.g., a connecting member, a transition member, etc.).

Fig. 1-4 illustrate by way of example a switchgear 100 of the present application and an interlock device 10 thereof, the switchgear 100 may include a cabinet body, a cabinet door 40 movably mounted to the cabinet body to form a closed space with the cabinet body mated, and an isolated grounding mechanism 20, particularly a three-position switch and circuit breaker operating mechanism 30, housed within the closed space. The switch cabinet 100 may be, for example, an upper isolation lower circuit breaker ring main unit, and in particular an upper isolation lower circuit breaker ring main unit in which the isolation grounding mechanism 20 and the circuit breaker mechanism are not in the same longitudinal plane. In the illustrated embodiment, the interlock device 10 may be mounted to the cabinet interior and may include a door lock member 11, a first drive rod 12, and a second drive rod 13.

As shown, the door lock member 11 may include a main body portion 111 and a lock lever 112 movably mounted, e.g., slidably mounted, to the main body portion 111, the lock lever 112 being slidable relative to the main body portion 111 to a locked position shown in fig. 1 or an unlocked position shown in fig. 3, as controlled by an external force, e.g., an operator or an operating mechanism. The lock lever 112 passes through the locking notch 42 on the locking plate 41 mounted to the inner side of the cabinet door 40 in the locked position to lock the cabinet door 40 to the cabinet body to be prevented from being opened, and moves the locking notch 42 to unlock with the locking plate 41 and thus with the cabinet door 40 in the unlocked position, thereby allowing the cabinet door 40 to be opened. Wherein the locking notch 42 is sized to permit passage of the locking bar 112 only when the door 40 is in place relative to the cabinet door when the door 40 is again closed from the open condition.

The first end of the first transmission rod 12 is mounted to the lock rod 112, for example via the crank arm 14, so as to rotate following the sliding movement of the lock rod 112, and the second end of the first transmission rod 12 extends laterally below the isolating grounding mechanism 20 to facilitate engagement of the second transmission rod 13 with the isolating grounding mechanism 20. The first end of the second transmission rod 13 may also be connected to the second end of the first transmission rod 12, for example via a crank arm 14, so that the second transmission rod 13 may move following the rotation of the first transmission rod 12. As shown in fig. 1, the second transmission rod 13 is thus movable in synchronization with the lock rod 112. The second end of the second drive rod 13 extends longitudinally from its first end to a notch 21 adjacent the isolated grounding mechanism 20. The combination of the transverse arrangement of the first transmission rod 12 and the longitudinal arrangement of the second transmission rod 13 not only can greatly reduce the occupied space of the interlocking device 10 in the cabinet body, but also can be suitable for the situation that the isolation grounding mechanism 20 and the circuit breaker operating mechanism 30 are not located on the same longitudinal plane, and has wider applicability.

Further, a closing interlocking part 131, such as a closing interlocking plate fixedly connected to the second transmission rod 13 and extending radially outward from the second transmission rod 13, is provided on the outer circumference of the second transmission rod 13. The closing interlocking part 131 on the second transmission rod 13 is designed to cooperate with a shaft pin on the breaker operating mechanism 30, for example, a main shaft transmission member of the breaker, so that when the breaker operating mechanism 30 is not moved to the closing position, the breaker operating mechanism 30 is located in a moving path of the closing interlocking part 131 to prevent the closing interlocking part 131 and thus the second transmission rod 13 from moving, and when the breaker operating mechanism 30 is moved to the closing position, the breaker operating mechanism 30 is unseated to allow the closing interlocking part 131 and allow the second transmission rod 13 to move, as shown in fig. 1 to 3.

Further, as shown in fig. 1 to 2b, when the isolating earthing mechanism 20 is moved to the earthing position, the notch 21 provided with the periphery of the disc of the isolating earthing mechanism 20 is correspondingly moved downward to be opposite to the second end of the second transmission rod 13, thereby allowing the second end of the second transmission rod 13 to be moved into the notch 21 as shown in fig. 3 to 4b, and accordingly, the isolating earthing mechanism 20 is prevented from being moved away from the earthing position. Accordingly, when the isolating grounding mechanism 20 is moved to the grounding position, the isolating grounding mechanism 20 will abut against the second end of the second transmission rod 13, thereby preventing the movement of the second transmission rod 13.

In this way, only in the case where the isolating earthing mechanism 20 is in the earthing state and the circuit breaker operating mechanism 30 is in the closing state, the movement of the second transmission lever 13 is not blocked by the circuit breaker operating mechanism 30 and the isolating earthing mechanism 20, and therefore, the lock lever 112 can be moved from the locking position to the unlocking position by the external force, the second transmission lever 13 is moved toward the notch 21 of the isolating earthing mechanism 20 via the first transmission lever 12 in response to the movement of the lock lever 112, so that when the lock lever 112 is moved to the unlocking position, the second end of the second transmission lever 13 is moved into the notch 21 of the isolating earthing mechanism 20, and the lock lever 112 achieves unlocking with the cabinet door 40 to allow the cabinet door 40 to be opened. It will be appreciated that when the isolating grounding mechanism 20 is not in the grounding position or the circuit breaker operating mechanism 30 is not in the closing position, the locking lever 112 cannot be moved and therefore the cabinet door 40 cannot be opened. In summary, by the mechanical interlocking of the door lock member 11, the first transmission rod 12 and the second transmission rod 13, an interlocking relationship among the grounding switch, the circuit breaker and the cabinet door 40 is achieved, the reliability of the switch cabinet 100 to which the interlocking device 10 is applied is greatly improved, and the operation is extremely simple.

Optionally, as shown in fig. 1, on the outer surface of the second transmission rod 13, a brake release interlocking portion 132 is further disposed, which is axially spaced with respect to the brake release interlocking portion 131, and the brake release interlocking portion 132 may be configured as a brake release interlocking plate extending radially outward from the second transmission rod 13. Specifically, the first end of the opening interlocking part 132 is rotatably connected to the second transmission rod 13 and the second end is freely suspended, and an intermediate region between the first end and the second end of the opening interlocking part 132 is rotatably connected to the cabinet body, so that when the second transmission rod 13 moves, the opening interlocking part 132 can rotate about its connection point with the cabinet body, so that the second end of the opening interlocking part 132 moves to a position locked (as shown in fig. 3a to 4) or unlocked (as shown in fig. 1 to 2 b) with the opening trip mechanism 50 of the switch cabinet 100.

Specifically, when the lock lever 112 moves to the unlock position, the second transmission lever 13 moves along with the lock lever 112 via the first transmission lever 12, and the opening interlocking part 132 is correspondingly driven to lock the opening tripping mechanism 50, so that when the switch cabinet 100 is overhauled and maintained, the opening of the circuit breaker of the switch cabinet 100 is prevented, and the safety of operators is ensured. Accordingly, the trip interlock 132 is also designed such that the trip interlock 132 is unlocked from the trip release mechanism 50 when the lock lever 112 is returned to the locked position again, thereby allowing the circuit breaker to trip. In this way, an interlocking relationship is achieved in which the opening operation of the circuit breaker is performed only when the door 40 is closed in place relative to the cabinet.

Alternatively, as shown in fig. 1 to 3, the door lock member 11 may further include an anti-locking plate 113 mounted to the main body portion 111 via an elastic member, the anti-locking plate 113 abutting to the outside of the locking lever 112 to bias the locking lever 112 moved to the unlocking position to prevent the locking lever 112 from falling back to the locking position. Preferably, a side of the outer surface of the lock lever 112 facing the anti-locking plate 113 may be provided with a radially inward engaging groove 112a in an axial direction, the engaging groove 112a may engage the locking plate when the lock lever 112 is moved to the unlocking position, and an upper end side thereof may be engaged with the anti-locking plate 113 to enhance the ability of the anti-locking plate 113 to prevent the lock lever 112 from being moved to the locking position. Thus, when the lock lever 112 is to be moved from the unlocked position to the locked position, the lock lever 112 must be moved to the unlocked position by pushing the anti-lock plate 113 open and the cabinet door 40 must be closed in place relative to the cabinet body so that the lock lever 112 can pass through the locking notch 42.

In the practical application process, as shown in fig. 1 to 2b, when the isolating grounding mechanism 20 moves to the grounding position and the circuit breaker operating mechanism 30 moves to the closing position, the lock lever 112 can be moved upwards, the lock lever 112 moves out of the locking opening 42 of the locking plate 41, meanwhile, the first transmission rod 12 rotates and drives the second transmission rod 13 to move upwards, the second end of the second transmission rod 13 moves into the notch 21 of the isolating grounding mechanism 20, and the opening interlocking part 132 is driven to lock the opening tripping mechanism 50, as shown in fig. 3 to 4b, and at this time, the operator can open the cabinet door 40 for maintenance.

After maintenance is completed, the operator can close the cabinet door 40 in place, the lock lever 112 is moved downwards, the lock lever 112 is moved into the locking notch 42 of the locking plate 41, meanwhile, the first transmission rod 12 rotates to drive the second transmission rod 13 to move downwards, the second end of the second transmission rod 13 moves out of the notch 21 of the isolating grounding mechanism 20, the opening interlocking part 132 is driven to unlock the opening tripping mechanism 50, as shown in fig. 1 to 2b, at this time, the operator can operate the circuit breaker operating mechanism 30 to move to the opening position, the isolating grounding mechanism 20 to move to the closing position, and the circuit breaker operating mechanism 30 to move to the closing position again.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment is provided with a separate technical solution, and this description is for clarity only, and those skilled in the art should consider the disclosure as a whole, and the technical solutions in the various embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing is illustrative of the present application and is not to be construed as limiting the scope of the application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of this application, and it is intended to be within the scope of the application.

Claims (10)

1. An interlock device (10) for a switchgear (100), the switchgear (100) comprising a cabinet body, a cabinet door (40) mounted to the cabinet body, and an isolated grounding mechanism (20) and a circuit breaker operating mechanism (30) housed in the cabinet body, characterized in that the switchgear (100) is mounted to the cabinet body with the interlock device (10) and comprises:

a door lock member (11) comprising a main body portion (111) and a lock lever (112) movably mounted to the main body portion (111), the lock lever (112) being locked to the cabinet door (40) in a closed position;

a first drive rod (12) having a first end connected to the lock rod (112) and a second end extending transversely below the isolating grounding mechanism (20);

a second transmission rod (13) having a first end connected to the first transmission rod (12) and a second end extending longitudinally to be opposite to a notch (21) of the isolating and grounding mechanism (20) in a grounding position, the second transmission rod (13) being provided with a closing interlock (131) along its longitudinal direction, the circuit breaker mechanism being configured to allow movement of the closing interlock (131) when in a closing position;

when the lock rod (112) moves to the unlocking position under the action of external force, the lock rod (112) can drive the second transmission rod (13) to move to the notch (21) of the isolation grounding mechanism (20) through the first transmission rod (12), so that when the lock rod (112) moves to the unlocking position, the second end of the second transmission rod (13) moves into the notch (21) of the isolation grounding mechanism (20), and the lock rod (112) and the cabinet door (40) are unlocked to allow the cabinet door (40) to be opened.

2. The interlock device (10) for a switch cabinet (100) according to claim 1, wherein the door lock member (11) further includes a reverse locking plate (113) elastically mounted to the main body portion (111), the reverse locking plate (113) exerting a biasing force on the lock lever (112) located at an unlock position to prevent the lock lever (112) from moving toward a lock position.

3. The interlock device (10) for a switch cabinet (100) according to claim 2, wherein an engagement groove (112 a) recessed radially is provided on an outer surface of the lock lever (112) in an axial direction thereof, the engagement groove (112 a) being engaged to the anti-lock plate (113) when the lock lever (112) is in the unlock position.

4. The interlocking device (10) for a switchgear (100) according to claim 1, wherein a release interlocking portion (132) spaced from the closing interlocking portion (131) is provided on the second transmission rod (13) along an axial direction thereof, and the release interlocking portion (132) moves to a release tripping mechanism (50) for locking the switchgear (100) when the lock lever (112) moves to an unlocking position.

5. The interlocking device (10) for a switchgear cabinet (100) according to claim 1, wherein the interlocking device (10) for a switchgear cabinet (100) further comprises a locking plate (41) mounted to the inner side of the cabinet door (40), and a locking opening (42) allowing the lock rod (112) to pass through when the cabinet door (40) is closed in place is formed in the locking plate (41).

6. Interlocking device (10) for a switchgear (100) according to claim 1, characterized in that the two ends of the first transmission rod (12) are connected to the locking rod (112) and the second transmission rod (13) via respectively a lever (14).

7. Interlocking device (10) for a switchgear (100) according to claim 1, characterized in that the closing interlocking part (131) is fixedly connected to the second transmission rod (13).

8. The interlocking device (10) for a switchgear (100) according to claim 4, characterized in that the opening interlocking portion (132) is rotatably mounted to the second transmission rod (13).

9. A switchgear (100), characterized in that the switchgear (100) comprises a cabinet body, a cabinet door (40) mounted to the cabinet body, and an isolating grounding mechanism (20) and a circuit breaker operating mechanism (30) housed in the cabinet body, and an interlock device (10) for the switchgear (100) according to any one of claims 1 to 8.

10. The interlock device (10) for a switchgear cabinet (100) of claim 9 wherein said isolated ground switch is a three-position switch.