CN110491692B

CN110491692B - Operating handle of grounding switch

Info

Publication number: CN110491692B
Application number: CN201810460767.0A
Authority: CN
Inventors: 王玉军; 王腊洪; 刘晓丽
Original assignee: Eaton Electrical Equipment Co Ltd
Current assignee: Eaton Electrical Equipment Co Ltd
Priority date: 2018-05-14
Filing date: 2018-05-14
Publication date: 2022-02-08
Anticipated expiration: 2038-05-14
Also published as: CN110491692A

Abstract

The invention provides a grounding switch operating handle, comprising: the device comprises an operating handle rod, a sleeve, a joint, a guide shaft and a return spring; wherein the invention achieves the extraction of the joint by axially displacing the sleeve from its operative position to its angular adjustment position, and in this angular adjustment position allows the rotation of the sleeve relative to the joint to change the angular relationship therebetween, and automatically resets after the angular relationship is adjusted. By utilizing the earthing switch operating handle, an operator can rotationally drive the joint at any suitable operating position, and the ergonomic requirement of the earthing switch operating handle is greatly met even in a narrow environment.

Description

Operating handle of grounding switch

Technical Field

The invention relates to the field of high and medium voltage switchgear, in particular to a handle for operating an earthing switch in high voltage switchgear.

Background

During operation of a conventional high-medium voltage switchgear, such as a medium voltage switchgear, an operator typically operates the closing and opening of the earthing switch using an earthing switch operating handle. A known operating handle is, for example, an operating handle disclosed in chinese utility model patent CN 204809067U. As shown in the above-mentioned patent documents, the operating handle comprises a first rod and a second rod in the form of one piece at a first angle to each other. The first end of the first rod has at least two grooves in the axial direction, and the first rod has an annular recess with a smaller cross-sectional diameter than the first rod end at the end portions of the two grooves. A protrusion in the switch cabinet may cooperate with the two recesses and the annular recess such that the handle device can be inserted into or withdrawn from the operating opening and operated.

In practical use, it is found that for the reason of ensuring the operation safety, an operator is usually required to insert the operating handle in the horizontal position, rotate the operating handle clockwise by 180 degrees after the operating handle is stably connected with the grounding switch, and then pull out the operating handle in the horizontal position, so that the handle can be opened and closed in the horizontal position. This brings about the following inconvenience: the operator is inconvenienced, especially in narrow operating environments which are disadvantageous or even do not allow the operating handle to be rotated through 180 °. In other words, the existing operating handle is not ergonomically designed.

Accordingly, there exists a need in the industry to improve at least one of the above-described deficiencies of the earthing switch operating handle to facilitate reliable operation by an operator in a variety of operating environments.

Disclosure of Invention

The present invention seeks to provide an earthing switch operating handle which at least partially addresses the above-mentioned deficiencies of the prior art.

According to an aspect of the present invention, there is provided an earthing switch operating handle comprising: an operating handle lever; a sleeve having a through hole at one end thereof through which the operating handle rod passes, and a plurality of recesses provided at intervals along an outer circumference of the sleeve on an end surface at the other end thereof, the sleeve further having a counter bore opened toward the recesses; a connector provided at an end thereof facing the sleeve with a boss which positively engages the plurality of recesses to transmit torque when engaged therewith, the connector being provided at an end remote from the sleeve with an interface for engaging the earthing switch, the connector further having a central bore which opens towards the sleeve; a guide shaft having one end freely rotatably accommodated in the center hole of the joint and the other end accommodated in a counter bore of the sleeve and connected to the sleeve in a relatively non-rotatable manner, the sleeve being displaceable along the guide shaft in an axial direction thereof between an operating position in which the notch is engaged with the boss and an angle adjusting position in which the notch is disengaged from the boss, an angle of the operating handle lever relative to the joint being adjustable via rotation of the sleeve relative to the joint when the sleeve is at the angle adjusting position; a return spring configured to return the sleeve from the angular adjustment position to the operating position.

In contrast to the prior art, the joint of the earthing switch operating handle according to the present invention is extractable relative to the sleeve. In other words, when the joint of the operating handle is coupled with the switch in the switchgear cabinet, the extraction of the joint is achieved by the axial displacement of the sleeve from its operating position to its angular adjustment position, in which the rotation of the sleeve with respect to the joint is allowed to change the angular relationship between the two, and automatically reset after the angular relationship is adjusted. By utilizing the earthing switch operating handle, an operator can rotationally drive the joint at any suitable operating position, and the ergonomic requirement of the earthing switch operating handle is greatly met even in a narrow environment.

In a preferred embodiment, the guide shaft is connected to the joint via a first pin, wherein a ring groove is further formed in the joint for the first pin to rotate therein, wherein an axial length of the ring groove is substantially equal to an axial length of the first pin, so as to prevent relative displacement of the guide shaft and the joint in the axial direction. Thereby, the following movement between the guide shaft and the joint is achieved with a simple structure: allowing free relative pivoting but not axial displacement therebetween.

In a preferred embodiment, the guide shaft is connected to the sleeve via a second pin, and a first through hole and a second through hole through which the second pin is inserted are further opened in the guide shaft and the sleeve, respectively, wherein a length of the first through hole in the axial direction is different from a length of the second through hole in the axial direction, so as to allow the sleeve to be displaced in the axial direction thereof along the guide shaft. In a further preferred embodiment, the guide shaft is further connected to the sleeve via a third pin axially spaced from the second pin, and the guide shaft and the sleeve are further respectively opened with a third through hole and a fourth through hole through which the third pin is inserted, wherein a length of the third through hole in the axial direction is different from a length of the fourth through hole in the axial direction to allow the sleeve to be displaced in the axial direction thereof along the guide shaft. Thereby, the extraction of the joint is achieved with a simple structure allowing the sleeve to be axially displaced from its operative position to its angular adjustment position, which in turn allows the rotation of the sleeve relative to the joint to change the angular relationship therebetween.

In a preferred embodiment, the return spring is a spring sandwiched between the second pin and the third pin, one end of the spring is connected to the second pin, the other end of the spring is connected to the third pin, and the spring is configured to pull the sleeve to an operating position. This allows an automatic resetting of the connection relative to the sleeve with a simple construction.

In a preferred embodiment, the sleeve is further provided with a pin hole arranged transversely to the insertion direction of the operating handle lever for receiving a fastening pin, wherein the fastening pin is configured to detachably connect the operating handle lever to the sleeve. Thus, the grounding switch operating handle can be operated by an operator at various different angles through a simple structure.

Additional features and advantages of the invention 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 invention.

Drawings

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

fig. 1 shows a perspective view of an earthing switch operating handle according to the present invention, with a part of the material of the operating handle removed in order to show the internal structure of the operating handle;

FIG. 2 shows a cross-sectional elevation view of the earthing switch operating handle of FIG. 1;

FIG. 3 shows a top view of a bushing of the earthing switch operating handle according to the present invention and a cross-sectional view thereof taken along the line B-B;

fig. 4 shows a plan view of a guide shaft of the earthing switch operating handle according to the present invention;

fig. 5 shows a top view of the earthing switch operating handle according to the present invention.

List of reference numerals

10. Earthing switch operating handle 1, operating handle rod 2, sleeve 3, joint 4 and guide shaft

5. Reset spring 21, through hole 22, notch 23, counter bore 24 and second through hole

25. Fourth through hole 26, pin hole 31, boss 32, interface 33 and central hole

34. Ring groove 41, first through hole 42, third through hole 61, first pin 62, and second pin

63. Third pin 64, fastening pin

Detailed Description

Referring now to the drawings, an illustrative version of the disclosed earthing switch operating handle will be described in detail. Although the drawings are provided to present some embodiments of the invention, 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 "front," "back," "inner," "outer," "above," "below," and other directional terms, will be understood to have their normal meaning and refer to those directions as normally contemplated by 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.

In fig. 1-5 there is shown an earthing switch operating handle 10 according to the present invention, which differs from the one-piece operating handle of the prior art in that it comprises: an operating handle lever 1, which may be made of, for example, a common steel tube or a crowbar, for an operator to apply torque to the earthing switch operating handle; a sleeve 2 having a through hole 21 at one end thereof through which the operating handle lever is inserted, as shown in fig. 3, a pin hole 26 is provided at a center position of the through hole 21 in a manner to penetrate the sleeve 2 in a direction transverse to an insertion direction of the operating handle lever 10, and after the operating handle lever 1 is inserted into the through hole 21, the operating handle lever 1 is detachably connected to the sleeve 2 by inserting a fastening pin 64 shown in fig. 1 into the pin hole 26. When the earthing switch operating handle 10 is stopped from being used, the fastening pin can be pulled out, so that the operating handle lever 1 and the sleeve 2 can be disassembled for storage.

As shown in fig. 1, the sleeve 2 is provided with a plurality of notches 22 at intervals along the outer periphery of the sleeve 2 on the end surface of the other end thereof. Preferably, the notches 22 are evenly spaced at the same included angle on the outer circumference; further, as shown in fig. 3, the sleeve is also provided with a counter bore 23 which opens towards the recesses 22. Further, the sleeve 2 is provided with a second through hole 24 and a fourth through hole 25 at intervals in the axial direction thereof, wherein the lengths of the second through hole 24 and the fourth through hole 25 in the axial direction are different, as a non-limiting example, wherein the length of the second through hole 24 in the axial direction is smaller than the length of the fourth through hole 25.

The operating handle 10 also includes a connector 3 configured to engage with a grounding switch. As shown in fig. 5, the joint 3 is provided at an end thereof facing the sleeve 2 with a plurality of bosses 31 which are engaged with the plurality of recesses 22 in a shape to transmit torque when engaged with the recesses 22, and preferably, the number of the recesses 22 is the same as the number of the bosses 31 and there is a one-to-one correspondence therebetween. Of course, it will also be appreciated that the number of bosses 31 may be less than the number of recesses in a multiple relationship to achieve different angular relationships of the fitting relative to the sleeve via the bosses 31 mating with different recesses. As further shown in fig. 1, the terminal 3 is provided at an end remote from the sleeve 2 with an interface 32 for engaging an earthing switch (not shown here), wherein the inner contour of the interface 32 is configured to be adapted to the outer contour of the earthing switch, the terminal 3 further having a central bore 33 which opens out towards the sleeve 2. Further, as shown in fig. 1 and 2, the joint 3 is provided with a pin hole for passing a first pin serving as a positioning pin therethrough and a ring groove 34 connected to the pin hole, and the ring groove 34 has a diameter larger than the height of the first pin so as to allow the first pin to freely rotate in the ring groove. Preferably, the axial length of the annular groove 34 is substantially equal to the axial length of the first pin.

As shown in fig. 1, the operating handle 10 further includes a guide shaft 4 accommodated in the counterbore 23 and the center hole 33 of the sleeve 2. Specifically, the guide shaft 4 is accommodated with one end thereof freely rotatably in the center hole 33 of the joint 3 and with the other end thereof accommodated in the counterbore 23 of the sleeve 2 and connected to the sleeve 2 in a relatively non-rotatable manner. In the present embodiment, fastening the guide shaft 4 in the axial direction so as not to be relatively displaceable with respect to the joint 3 is achieved via the first pin by the first pin 61 being inserted through the first pin hole and the ring groove 34 and being opened in the through hole at one end of the guide shaft 4, which further allows the guide shaft 4 to freely rotate with respect to the joint 3 since the first pin 61 can freely rotate within the ring groove 34.

On this basis, in the present embodiment, the guide shaft is made non-rotatable with respect to the sleeve 2 via the second pin 62 fastened to the sleeve 2 and pierced through the guide shaft 4. Wherein a first through hole 41 is opened on the guide shaft 4 for the second pin 62 to pass through, wherein the length of the first through hole 41 in the axial direction is different from the length of the second through hole 24 in the axial direction. Thereby, after the guide shaft 4 is inserted into the counterbore 23 in the sleeve 2 and the second pin 62 is inserted, relative rotation between the sleeve 2 and the guide shaft 4 can be made non-rotatable. Meanwhile, due to the difference in length in the axial direction of the first through hole 41 and the second through hole 24, the guide shaft 4 has a moving space displaced in the axial direction with respect to the sleeve 2, the moving space having a length in the axial direction equal to the difference in axial length of the first through hole 41 and the second through hole 24. The sleeve 2 is made displaceable along the guide shaft 4 in its axial direction between an operating position where the notch 22 is engaged with the boss 31 and an angle adjusting position where the notch 22 is disengaged from the boss 31 via displacement of the sleeve in the axial direction. The angular adjustment position is a position in which the notches 22 can clear the bosses 31 and come out of contact with each other, which enables the angle of the operating handle lever 1 relative to the joint 3 to be adjusted via rotation of the sleeve 2 relative to the joint 3 when the sleeve 2 is in the angular adjustment position, thereby allowing the operator to operate the earthing switch operating handle in a user-friendly manner.

As a further preferable mode, the guide shaft 4 may also be made non-rotatable with respect to the sleeve 2 via a third pin 63 fastened to the guide shaft 4 and pierced through the guide shaft 4. A third through hole 42 is formed in the guide shaft 4, through which the third pin 63 is inserted, wherein the length of the third through hole 42 in the axial direction is different from the length of the fourth through hole 25 in the axial direction. In this embodiment, the length of the fourth through hole 25 is greater than the length of the third through hole 32 in the axial direction. With this, after the guide shaft 4 is inserted into the counterbore 23 in the sleeve 2 and the third pin 63 is inserted, relative rotation between the sleeve 2 and the guide shaft 4 can be made non-rotatable. Meanwhile, the guide shaft 4 has a moving space displaced in the axial direction with respect to the sleeve 2 due to the difference in length in the axial direction of the third through hole 42 and the fourth through hole 25. The sleeve 2 is made displaceable along the guide shaft 4 in its axial direction between an operating position in which the notch 22 is engaged with the boss 31 and an angle adjusting position in which the notch 22 is disengaged from the boss 31 via displacement of the sleeve in the axial direction, thereby allowing an operator to operate the earthing switch operating handle in a user-friendly manner.

It is to be noted that although in the embodiment it is shown that a first pair of through holes consisting of the first through hole 41 and the second through hole 24 and a second pair of through holes consisting of the third through hole 42 and the fourth through hole 25 are provided at the same time, a person skilled in the art will appreciate that it is not necessary to provide the first and second pairs of through holes at the same time, as this is not necessary to achieve the axial displaceability of the sleeve 2 with respect to the guide shaft 4. Those skilled in the art can appreciate that the axial displacement of the sleeve 2 can be achieved as long as a movable space in the axial direction is formed between the guide shaft 4 and the sleeve 2.

As shown in fig. 1-2, the earthing switch operating handle 10 further includes a return spring 5 configured to return the sleeve 2 from the above-described angle adjusting position to the operating position. Specifically, the return spring 5 may be a spring 5 interposed between the above-described second pin 62 and third pin 63, wherein one end of the spring is connected to the second pin 62 and the other end thereof is connected to the third pin 63, wherein the spring 5 applies a pulling force to the second pin 62 and the third pin 63 in the axial direction to bring them close to each other, so as to pull the sleeve 2 back to the operating position after the sleeve 2 has been axially displaced with respect to the guide shaft 4.

The method of using the earthing switch operating handle 10 according to the present invention will be described in detail with reference to fig. 1-2.

When it is desired to operate the earthing switch of a switchgear cabinet in, for example, a confined space, the operator can first engage the earthing switch handle 10 with the interface of its connector 3 to the earthing switch. When an operator rotates the joint 3 by a certain angle by operating the handle lever 1, it is desirable to change the operating angular relationship between the operating handle lever 1 and the joint 3, for example, to avoid unnecessary interference or to facilitate the operation of the operator, if there is a situation such as interference or inconvenience in operation. To do so, the operator may pull the ground switch handle 10 hard outward. Due to the engagement relationship of the interface of the joint 3 and the grounding switch, pulling out the grounding switch handle 10 will cause the joint 3 to be pulled out with respect to the sleeve 2, i.e. the sleeve 2 is moved to an angular adjustment position, in which the notch 22 of the sleeve 2 is disengaged from the boss 31 of the joint 3, via axial displacement of the sleeve 2 with respect to the guide shaft. In this process, on the one hand, the guide shaft 4 and the joint 3 are not displaced in the axial direction, which is achieved by the first pin 61 fastening the guide shaft 4 to the joint 3. On the other hand, since there is an axial movement space between the sleeve 2 and the guide shaft 4 brought about by the first through hole 41 and the second through hole 24 and/or the third through hole 42 and the fourth through hole 25, the sleeve 2 is displaced in the axial direction relative to the guide shaft 4 and the return spring is stretched during the displacement. After the sleeve 2 is axially displaced relative to the guide shaft 4 to an angular adjustment position where the boss 31 of the joint 3 is disengaged, the operator can change the angular relationship of the sleeve 2 relative to the joint 3 and thus the handle lever 1 relative to the joint 3 by rotating the sleeve 2 together with the guide shaft 4. That is, such rotation of the sleeve 2 with respect to the joint 3 is achieved via free rotation of the guide shaft 4 with respect to the joint 3 and accompanying rotation of the guide shaft 4 and the sleeve 2. When the sleeve 2 is rotated to the appropriate angle relative to the joint 3, the operator releases the handle 1, so that the sleeve 2 and the joint 3 are reset under the action of the spring 5, i.e. the notches 22 of the sleeve 2 and the bosses 31 of the joint 3 come back into engagement, thereby allowing the handle 1 to drive the joint 3 in a changed angular relationship relative to the joint 3. It can thus be seen that the extraction of the joint 3 is achieved according to the invention by axial displacement of the sleeve 2 from its operative position to its angular adjustment position, in which rotation of the sleeve relative to the joint is permitted to change the angular relationship therebetween, and automatic resetting occurs after adjustment of the angular relationship. With the earthing switch operating handle 10 of the present invention, the operator can rotationally drive the joint at any suitable operating position, even in a narrow environment, which greatly meets the ergonomic requirements of the earthing switch operating handle.

It is to be understood that while the specification has been described in terms of various embodiments, it is not intended that each embodiment comprises a separate embodiment, and such descriptions are provided for clarity only and should be taken as a whole by those skilled in the art, and that the embodiments may be combined to form other embodiments as will be apparent to 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. Equivalent alterations, modifications and combinations will occur to those skilled in the art without departing from the spirit and principles of the invention.

Claims

1. An earthing switch operating handle, comprising:

an operating handle lever;

the sleeve is provided with a through hole for the operating handle rod to penetrate through at one end, a plurality of notches are arranged on the end face of the other end at intervals along the periphery of the sleeve, and the sleeve is further provided with counter bores which are opened towards the notches;

a connector having a boss at an end thereof facing the sleeve which is form-fitted with the plurality of recesses to transmit torque when engaged with the recesses, the connector having an interface at an end remote from the sleeve for engaging the earthing switch, the connector further having a central bore which opens to the sleeve;

a guide shaft having one end freely rotatably accommodated in the center hole of the joint and the other end accommodated in a counter bore of the sleeve and connected to the sleeve in a relatively non-rotatable manner, the sleeve being displaceable along the guide shaft in an axial direction thereof between an operating position in which the notch is engaged with the boss and an angle adjusting position in which the notch is disengaged from the boss, so that an angle of the operating handle lever with respect to the joint can be adjusted via rotation of the sleeve with respect to the joint when the sleeve is at the angle adjusting position;

a return spring configured to return the sleeve from the angular adjustment position to the operating position;

wherein the guide shaft is connected to the sleeve via a second pin and the guide shaft is further connected to the sleeve via a third pin axially spaced from the second pin, and a third through hole and a fourth through hole through which the third pin is inserted are further opened on the guide shaft and the sleeve, respectively, wherein an axial length of the third through hole is different from an axial length of the fourth through hole to allow the sleeve to be axially displaced along the guide shaft.

2. The operating handle according to claim 1, wherein the guide shaft is connected to the joint via a first pin, wherein a ring groove in which the first pin rotates is further formed in the joint, and an axial length of the ring groove is substantially equal to an axial length of the first pin, so that the guide shaft and the joint are prevented from being relatively displaced in the axial direction.

3. The operating handle according to claim 2, wherein the guide shaft is connected to the sleeve via a second pin, and a first through hole and a second through hole through which the second pin is inserted are further opened in the guide shaft and the sleeve, respectively, wherein an axial length of the first through hole is different from an axial length of the second through hole to allow the sleeve to be axially displaced along the guide shaft.

4. The operating handle according to claim 1, wherein the return spring is a spring sandwiched between the second pin and the third pin, one end of the spring is connected to the second pin, the other end of the spring is connected to the third pin, and the spring is configured to pull the sleeve to the operating position.

5. Operating handle according to any of claims 1 to 4, characterized in that the sleeve is further provided with a pin hole arranged through it transversely to the insertion direction of the operating handle lever for receiving a fastening pin, wherein the fastening pin is configured to connect the operating handle lever to the sleeve in a detachable manner.