CN215681524U - Interlocking mechanism for a switching device and switching device - Google Patents

Abstract

The utility model relates to an interlocking mechanism for a switching device and the switching device. The switching device includes: a cabinet having a cabinet body and a cabinet door capable of opening and closing the cabinet body; the handcart can move in and out of the cabinet body and is provided with a test position and a working position in the cabinet body. The interlocking mechanism includes: the support is suitable for being fixed in the cabinet body; the movable part is movably arranged on the support and provided with a locking part facing the cabinet door and a joint part facing the inside of the cabinet body, wherein the movable part is configured to be capable of abutting against a handcart moving from the test position to the working position or in the working position through the joint part so that the movable part is switched to an interlocking posture that the locking part is locked with the cabinet door, and the movable part is further configured to be capable of being switched to an unlocking posture that the locking part is separated from the cabinet door when the handcart is in the test position.

Description

Interlocking mechanism for a switching device and switching device

Technical Field

The utility model relates to the technical field of electrical equipment, in particular to an interlocking mechanism for a switching device and the switching device.

Background

A handcart or a switchgear (or called a mobile switchgear) is widely used due to advantages of easy maintenance and reliable power supply, and generally includes a fixed cabinet and a handcart that can be moved into and out of the cabinet. The handcart is provided with electric elements such as a circuit breaker, a mutual inductor and the like, and is used for being electrically connected with the electric elements in the cabinet to conduct a loop. The hand truck has three positions relative to the cabinet, namely a working position, a testing position and a disconnection position (also called a maintenance position). The disconnected position is located outside the cabinet, where the hand truck does not establish any connection with the electrical components within the cabinet. The test position and the working position are both positioned in the cabinet, and in the test position and the working position, a loop between the handcart and the electric element in the cabinet is partially or completely conducted. According to the industry standard, when the handcart leaves the test position and moves towards the direction close to the working position, the cabinet door of the cabinet needs to be timely and reliably locked to protect the safety of the operator.

Therefore, there is a need in the industry to design an interlocking mechanism between a hand truck and a cabinet door.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to an interlock mechanism for a switchgear that solves at least some of the above problems.

The present invention is also directed to a switching device employing the improved interlock mechanism described above.

According to an aspect of the present invention, there is provided an interlock mechanism for a switching device, wherein the switching device comprises: a cabinet having a cabinet body and a cabinet door capable of opening and closing the cabinet body; the handcart can move in and out of the cabinet body and is provided with a test position and a working position in the cabinet body; wherein the interlock mechanism comprises: the support is suitable for being fixed in the cabinet body; the movable part is movably arranged on the support and provided with a locking part facing the cabinet door and a joint part facing the inside of the cabinet body, wherein the movable part is configured to be capable of abutting against a handcart moving from the test position to the working position or in the working position through the joint part so that the movable part is switched to an interlocking posture that the locking part is locked with the cabinet door, and the movable part is further configured to be capable of being switched to an unlocking posture that the locking part is separated from the cabinet door when the handcart is in the test position.

According to the scheme, when the handcart leaves the test position and moves towards the working position, the handcart abuts against the joint part of the moving part and pushes the moving part to switch to the interlocking posture, so that the locking part of the moving part moves to the position capable of being locked with the cabinet door. The process of locking the movable part and the cabinet door is carried out along with the movement of the handcart from the test position to the working position, namely, the process is called 'interlocking', the process does not need additional locking action of an operator, and only needs to normally push the handcart into the working position. Through the size of rational design moving part and/or the position for the cupboard, can accomplish in case the handcart leaves the experimental position, just butt moving part and begin to promote the moving part and switch to interlocking gesture, accomplish in time of closure process. The locking process is only related to the movement of the handcart between the test position and the working position, and is not related to subjective factors such as the state and experience of an operator, so that the interlocking process is stable and reliable. The whole locking process is mechanical, so that the operator is effectively protected, and the risk that the cabinet door is opened accidentally is reduced.

In some embodiments, the moveable member includes a first projecting section, an end of the first projecting section configured as a first engagement adapted to abut the hand truck moving from the testing position to the operating position.

In some embodiments, the end of the first projecting section is provided with a first roller adapted to form a rolling friction fit with a hand truck moving from the testing position to the operating position.

In some embodiments, the movable member includes a second projecting section angled from the first projecting section, an end of the second projecting section configured as a second engagement adapted to rest on a hand truck in an operating position.

In some embodiments, the second engagement is further adapted to abut with the first engagement to the hand truck during movement of the hand truck from the testing position to the operating position.

In some embodiments, the end of the second projection section is provided with a second roller adapted to abut against or form a rolling friction fit with the hand truck.

In some embodiments, the support is provided with a limiting member, and the movable member abuts against the limiting member under the action of gravity in the unlocking posture.

In some embodiments, the moveable member is pivotally mounted on the support.

According to another aspect of the present invention, there is provided a switching apparatus including: a cabinet having a cabinet body and a cabinet door capable of opening and closing the cabinet body; the handcart can move in and out of the cabinet body and is provided with a test position and a working position in the cabinet body; wherein the switching device further comprises the aforementioned interlocking mechanism.

In some embodiments, the cabinet door has a projection projecting toward the interior of the cabinet body, the projection having an opening adapted to receive the latch portion of the movable member.

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

Drawings

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

fig. 1 is a schematic diagram of a switching apparatus according to an embodiment of the utility model, wherein the hand truck is in a testing position and the interlock mechanism is in an unlocked attitude;

FIG. 2 is an enlarged view at A of FIG. 1;

fig. 3 is a schematic diagram of a switching arrangement in which the hand truck begins to move from a testing position to an operating position in accordance with an embodiment of the present invention;

FIG. 4 is an enlarged view at B of FIG. 3;

fig. 5 is a schematic diagram of a switching arrangement in which the hand truck continues to approach the operating position and the interlock mechanism enters the interlock position, according to an embodiment of the present invention;

FIG. 6 is an enlarged view at C of FIG. 5;

fig. 7 is a schematic diagram of a switching arrangement according to an embodiment of the utility model, in which the hand truck continues to approach the operating position;

FIG. 8 is an enlarged view at D of FIG. 7;

fig. 9 is a schematic view of a switching device according to an embodiment of the utility model, with the hand truck in an operating position;

fig. 10 is an enlarged view of fig. 9 at E.

Description of reference numerals:

1. a switching device; 2. a cabinet; 21. a cabinet body; 22. a cabinet door; 221. a protrusion; 3. an interlock mechanism; 31. a support; 32. a limiting member; 33. a movable member; 331. a first projection section; 332. a first roller; 333. a first pivot; 334. a second projection section; 335. a second roller; 336. a second pivot; 337. a third projection section; 34. a pivotal shaft; 4. hand cart

Detailed Description

Referring now to the drawings, illustrative aspects of the disclosed interlock mechanism for a switchgear and the switchgear will be described in detail. Although the drawings are provided to present some embodiments of the utility model, the drawings are not necessarily to scale of particular embodiments, and certain features may be exaggerated, removed, or partially sectioned to better illustrate and explain the present disclosure. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings 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 normally relate to when viewing the drawings. Unless otherwise indicated, the 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.

Fig. 1 to 10 show an exemplary switching device 1 according to the utility model. As shown, the switchgear 1 includes a cabinet 2, a hand truck 4, and an interlock mechanism 3. Such a switching device 1 may be, for example, a high-voltage switching device. The cabinet 2 includes a cabinet body 21 defining an interior space and an opening communicating with the interior space, at which a cabinet door 22 is provided that is movable to open or close the interior space. Electrical components such as stationary contacts are disposed in the interior space of the cabinet 2. The cabinet door 22 is, for example, pivotably, translatably or detachably mounted to the cabinet body 21 at the opening. When the cabinet door 22 is opened, the hand truck 4 may be moved into or out of the interior space of the cabinet 2. In one embodiment, tracks may be provided on the cabinet 21 and the hand truck 4 moved along the tracks by means of an external actuating and/or transmission mechanism to access the interior space of the cabinet 2. The hand truck 4 has a disconnect position, a testing position and a working position in association with the cabinet 2. When the handcart 4 is in the disconnection position, the handcart 4 moves out of the inner space and leaves the cabinet 2, and at the moment, the handcart 4 is not connected with the electric elements in the cabinet 2, so that the handcart 4 can be overhauled. Both the testing position and the working position are located in the interior space of the cabinet 2. In the test position, a part of the circuit (e.g., a secondary circuit) between the hand truck 4 and the electrical components in the cabinet 2 is conducted. In the working position, all circuits (such as the primary circuit and the secondary circuit) between the handcart 4 and the electric elements in the cabinet 2 are conducted. In the solution according to the utility model, the functions of the off position, the test position and the operating position of the switching device 1 are the same as in the prior art and are not described here again.

The interlocking mechanism 3 serves to effectively close the cabinet door 22 and prohibit the cabinet door 22 from being opened in a simple manner in time during movement of the hand truck 4 from the testing position to the working position to protect the field operator. As shown in fig. 1 to 10, the holder 31 of the interlocking mechanism 3 is fixedly mounted on an inner wall (a horizontally extending inner wall in the drawings) of the cabinet 21. The fastening means may be a permanent connection, such as welding, gluing, or a detachable connection, such as a snap connection, a bolt connection, etc. The seat 31 may include, for example, a first seat for fixing to an inner wall of the cabinet 21 and a second seat connected to the first seat at an angle (e.g., vertically). The seat 31 may be made of sheet metal and may be formed integrally, for example by bending, to control costs and simplify manufacturing difficulties.

A pivot shaft 34 is arranged on the second seat body of the support 31, and the movable element 33 is sleeved on the pivot shaft 34 and can rotate around the central axis of the pivot shaft 34. As shown, the mobile element 33 has a first projecting section 331 projecting, the end of which section 331 faces the internal space of the cabinet 2 and forms a first engagement portion of the mobile element 33, and the mobile element 33 also has a second projecting section 334 projecting, the second projecting section 334 being arranged at an angle to the first projecting section 331. The end of the second protruding section 334 faces the internal space of the cabinet 2 and forms a second engagement portion of the mobile element 33. A third projection 337 is formed at the end of the movable element 33 facing away from the first projection 331 and the second projection 334 (i.e., toward the end of the cabinet door 22). The end of the third projecting section 337 forms a locking portion of the movable member 33. The first, second and third protruding sections 331, 334 and 337 are arranged such that the second and third protruding sections 334 and 337 are located on opposite sides of the first protruding section 331, respectively.

The working principle of the interlocking mechanism 3 of the switching device 1 according to the utility model is described in detail below with reference to fig. 1 to 10.

As shown in fig. 1 and 2, the hand truck 4 is in a testing position. At this time, the movable piece 33 of the interlock mechanism 3 is in the unlocking posture (or may also be referred to as a rest posture or an initial posture). In this position, the interlock mechanism 3 is not in contact with the hand truck 4, or is only in contact with the hand truck 4 but no interaction is generated between them. At this point, first and second projecting sections 331 and 334 of movable member 33 naturally sag to a position below the highest point or plane of hand truck 4 due to the force of gravity. In other words, first and second projecting sections 331 and 334 of mobile element 33 in the rest position droop to a position capable of interfering with further advancement of hand truck 4. In the rest position, third projecting portion 337 is correspondingly tilted so that the locking portion of movable element 33 is moved away from door 22, for example away from projection 221 with an opening in door 22. The cabinet door 22 can be opened or closed at this time. To stably achieve the desired resting position, pivot axis 34 may be inserted on movable member 33 offset from the center (center of mass) of movable member 33 and near the end of third projecting section 337. In order to accurately control the deflection angle of the movable element 33 around the pivot axis 34 in the resting posture so as to stably realize the linkage effect between the subsequent movable element 33 and the handcart 4, a limiting element 32 may be disposed on the support 31. In the illustrated embodiment, the limiting member 32 is disposed on the second seat of the support 31. In the rest position, the upper side surface of the third protruding section of the movable member 33 abuts against the stopper 32 to control the deflection angle of the movable member 33 about the pivot shaft 34. In an embodiment, not shown, the limiting element 32 may be configured as an arc-shaped groove formed on one of the support 31 and the movable element 33 and a limiting pin formed on the other of the support 31 and the movable element 33, the limiting pin is inserted into the arc-shaped groove, and the limitation of the deflection angle of the movable element 33 around the pivot axis 34 can also be realized by designing the radian of the arc-shaped groove.

As shown in fig. 3 and 4, the hand truck 4 leaves the test position and is pushed to the working position. At this time, the end of the first projection of the movable element 33 (the first engagement portion of the movable element 33) abuts against the handcart 4. As the hand truck 4 approaches the operating position, the movable member 33 is urged by the hand truck 4 to rotate in a clockwise direction as viewed in the drawings. Further, the end of the third protruding section 337 of the movable member 33 (i.e., the locking portion of the movable member 33) starts to be locked with the cabinet door 22. According to the illustrated embodiment, the locking may be provided by inserting an end of the third protruding section 337 into an opening of a protrusion 221 on the cabinet door 22, thereby serving to restrict the opening of the cabinet door 22. In another embodiment, the door 22 and the hinge 33 are formed as hooks, and the hooks are hooked together to form a lock. The movable element 33 at this time enters the interlocking posture. In this posture, since the handcart 4 always presses against the first protruding portion of the movable member 33 and applies a force to the movable member 33 to move the movable member 33 clockwise in the drawing, the movable member 33 is prohibited from moving counterclockwise, and the end of the third protruding section 337 cannot be disengaged from the opening of the protrusion 221 of the cabinet door 22, so that the movable member 33 and the cabinet door 22 are stably and reliably locked.

As shown in fig. 5 and 6, the hand truck 4 is propelled further toward the operating position. The first projecting section 331 of the movable member 33 comes to abut against and move along the top surface of the hand truck 4, while the end of the third projecting section 337 is further inserted in the opening of the projection 221 of the cabinet door 22, maintaining the interlocked attitude of the movable member 33.

In one embodiment, a first roller 332 may be connected to an end of the first protruding section 331 through a first pivot 333. By moving the first roller 332 along the top surface of the hand truck 4, rolling friction is formed between the first roller 332 and the top surface of the hand truck 4, which may effectively reduce wear on the hand truck 4 during abutment of the hand truck 4 with the first protruding section 331.

As shown in fig. 7 and 8, as the hand truck 4 is further propelled in a direction closer to the operating position, the first projecting section 331 of the moveable member 33 continues to move along the top surface of the hand truck 4. When the hand truck 4 is advanced to a certain extent, the end of the second projection section 334 (the second engagement portion of the movable piece 33) starts to enter a state of abutting against the hand truck 4 in a state where the first projection section 331 is still abutting against the hand truck 4. In this way, the second projection abuts against the hand truck 4 together with the first projection, and keeps the movable piece 33 continuously held in the interlocked posture.

In one embodiment, a second roller 335 may be coupled to the end of the second protruding section 334 by a second pivot 336. By moving the second roller 335 along the top surface of the hand truck 4, rolling friction is formed between the second roller 335 and the top surface of the hand truck 4, which may effectively reduce wear on the hand truck 4 during abutment of the hand truck 4 with the second protruding section 334.

As shown in fig. 9 and 10, the hand truck 4 is pushed to the working position, in which the first protruding section 331 of the movable member 33 is separated from the hand truck 4, the second protruding section 334 is held in abutment with the hand truck 4, the third protruding section 337 is held in locking engagement with the cabinet door 22, and the movable member 33 is positioned in the interlocking posture.

As can be seen from the above description, the locking of the movable member 33 with the cabinet door 22 occurs automatically and mechanically as the hand truck 4 advances from the test position to the working position, and is not affected by the subjective factors of the operator. This locking of the cabinet door 22, which occurs automatically as the hand truck 4 is pushed into the operating position, is an "interlock" in the sense of the present application. As long as the hand truck 4 is close to the working position, the cabinet door 22 isolates the high-pressure state of the space inside the cabinet 2 from the outside operator, which isolation is not breakable unless the hand truck 4 is pulled out of the working position back to the testing position, which means a timely and reliable protection of the operator.

Although the configuration and the operation principle of the interlock mechanism in the switchgear of the present invention are described above by way of specific embodiments, those skilled in the art will appreciate that there may be many variations of the interlock mechanism and combinations thereof with each other according to the operation principle described above.

For example, in one embodiment, not shown, the moveable member is linearly movably connected to the support. The moveable member is a split member wherein the first portion has a first protruding section as described above and the second portion has a third protruding section as described above. The second part of the movable piece can be connected to the first part through a transmission piece and can approach the cabinet door along with the movement of the first part to the working position. During the handcart moves from the test position to the working position, the first protruding section of the moving part is pressed to enable the first protruding section to be close to the working position, and therefore the third protruding section of the moving part can be close to the cabinet door and further enables the third protruding section to be locked with the cabinet door.

In a further embodiment, which is not shown, the first and second projecting sections can be integrated into one projecting section, the end of which (the joint of the movable part) is designed with a sufficient length and configuration to be able to always abut against the hand truck during its passage from the test position into the operating position and when it is in the operating position. Such a protruding section may be provided with a plurality of rollers (e.g. a row) at its sufficiently long end to form a rolling friction fit with the hand truck, or may be provided with only one roller.

It should be understood that although the description is in terms of various embodiments, not every embodiment includes only a single embodiment, and such description is for clarity purposes only, and those skilled in the art will recognize that the embodiments described herein may be combined as suitable to form other embodiments, as will be appreciated by those skilled in the art.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the utility model.

Claims (10)

1. An interlock mechanism for a switching device, wherein the switching device (1) comprises:

a cabinet (2) having a cabinet body (21) and a cabinet door (22) that can open and close the cabinet body (21);

a hand truck (4) movable into and out of the cabinet (21) and having a testing position and a working position within the cabinet (21);

characterized in that said interlocking mechanism (3) comprises:

a seat (31) suitable for being fixed inside the cabinet body (21);

a movable member (33) movably mounted on the support (31) and having a locking portion facing the cabinet door (22) and an engaging portion facing the inside of the cabinet body (21), wherein the movable member (33) is configured to be capable of abutting with the engaging portion a handcart (4) moving from the test position to the working position or in the working position to shift the movable member (33) to an interlocking posture in which the locking portion is locked with the cabinet door (22), and the movable member (33) is further configured to be capable of shifting to an unlocking posture in which the locking portion is disengaged from the cabinet door (22) during the period in which the handcart (4) is in the test position.

2. Interlocking mechanism according to claim 1, characterized in that the mobile element (33) comprises a first protruding section (331), the end of the first protruding section (331) being configured as a first engagement adapted to abut the hand truck (4) moving from the test position to the work position.

3. Interlocking mechanism according to claim 2, characterized in that the end of the first protruding section (331) is provided with a first roller (332), the first roller (332) being adapted to form a rolling friction fit with a hand truck (4) moving from the test position to the working position.

4. Interlocking mechanism according to claim 2, characterized in that the moving member (33) comprises a second projecting section (334) angled with respect to the first projecting section (331), the end of the second projecting section (334) being configured as a second engagement adapted to rest against the hand truck (4) in the working position.

5. The interlock mechanism according to claim 4, wherein the second engagement portion is further adapted to abut to the hand truck (4) together with the first engagement portion during movement of the hand truck (4) from the testing position to the operating position.

6. Interlocking mechanism according to claim 5, characterized in that the end of the second protruding section (334) is provided with a second roller (335), the second roller (335) being adapted to abut against the hand truck (4) or to form a rolling friction fit with the hand truck (4).

7. Interlocking mechanism according to one of claims 1 to 6, characterized in that the support (31) is provided with a stop (32), the movable element (33) bearing against the stop (32) under the action of gravity in the unlocking position.

8. Interlocking mechanism according to one of claims 1 to 6, characterized in that the movable element (33) is pivotably mounted on the support (31).

9. A switching device, comprising:

a cabinet (2) having a cabinet body (21) and a cabinet door (22) that can open and close the cabinet body (21);

a hand truck (4) movable into and out of the cabinet (21) and having a testing position and a working position within the cabinet (21);

characterized in that the switching device (1) further comprises an interlocking mechanism (3) according to any one of claims 1 to 8.

10. The switching device according to claim 9, wherein the cabinet door (22) has a projection (221) projecting towards the inside of the cabinet body (21), the projection (221) having an opening adapted to receive the blocking portion of the mobile element (33).

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