CN220041679U - Load switch and gas-insulated switchgear with same - Google Patents

Abstract

The utility model relates to a gas-insulated switchgear for a load switch and a load switch having the same. The disconnecting link device of the load switch comprises: a pair of movable contacts arranged in a side-by-side spaced relation to each other and extending into the recess of the main shaft; a guide pin crossing the pair of movable contacts and having both ends respectively abutted to the inner walls of the recess; a limiting part clamped to a section of the guide pin between the pair of movable contact pieces, and two ends of the limiting part respectively contact with the movable contact pieces so as to limit the pair of movable contact pieces to move relative to the guide pin under the condition that the pair of movable contact pieces are not subjected to external force; the thickness of the thickness change area of the end part of the fixed contact adjacent to the pair of movable contact pieces is changed from being smaller than the interval between the pair of movable contact pieces to at least equal to the interval between the pair of movable contact pieces, so that when the pair of movable contact pieces are driven by the main shaft to move to the thickness change area of the contact fixed contact, the thickness change area forces the pair of movable contact pieces in the non-centering position to push the limiting part to move relative to the guide pin until the limiting part moves to the centering position.

Description

Load switch and gas-insulated switchgear with same

Technical Field

The utility model relates to the technical field of electronic components, in particular to a load switch and a gas-insulated switchgear with the load switch.

Background

With the construction and transformation of urban power grids, the gas-insulated switchgear is widely applied to various occasions such as a ring network power supply system by virtue of the advantages of compact structure, high reliability, convenience in installation and the like. Gas insulated switchgear cabinets may generally include an air box and load switches or the like enclosed within the air box by an insulating gas, sulfur hexafluoride. However, sulfur hexafluoride gas is limited in emission as a high temperature room effect gas, and thus existing gas insulated switchgear gradually adopts an environment-friendly gas such as nitrogen or dry air instead of sulfur hexafluoride. Compared with sulfur hexafluoride, the erosion of the knife switch device of the load switch in the environment-friendly gas is more serious when the knife switch device is opened and closed, which requires the knife switch device of the load switch to have higher switching-on and switching-off speed, and correspondingly higher centering is required.

Accordingly, there is a need in the art for a knife switch assembly having excellent versus neutral properties.

Disclosure of Invention

The present utility model aims to provide a load switch which can solve at least some of the problems described above.

The utility model also aims to provide a gas-insulated switchgear employing the improved load switch.

According to one aspect of the present utility model, there is provided a load switch comprising a support frame, a stationary contact fixedly mounted to the support frame, a main shaft rotatably mounted to the support frame and a knife switch device driven by the main shaft into and out of engagement with the stationary contact, the main shaft being provided with a recess for receiving the knife switch device, the knife switch device comprising: a pair of movable contacts arranged in a side-by-side spaced relationship with respect to each other and extending into the recess; a guide pin crossing the pair of movable contacts and abutting both ends respectively to inner walls of the recess such that the pair of movable contacts are connected to the main shaft via the guide pin; a limiting member which is clamped to a section of the guide pin between the pair of movable contacts and both ends of which are respectively contacted with the movable contacts, so as to limit the movement of the pair of movable contacts relative to the guide pin under the condition that the pair of movable contacts are not subjected to external force; the thickness change area forces the pair of movable contact pieces in the non-centering position to push the limiting part to move relative to the guide pin until the limiting part moves to the centering position.

Compared with the prior art, the load switch provided by the utility model can be matched with a pair of movable contact pieces and a limiting part between the pair of movable contact pieces in the disconnecting link device through the thickness change area on the fixed contact, so that the disconnecting link device can slowly move relative to the fixed contact when the load switch is assembled, the movable contact piece in a non-centering position is forced to move to a centering position by the thickness change area, and the movable contact piece is kept in the centering position by the limiting part after being disengaged from the fixed contact.

Preferably, the thickness variation region includes a guide section adjacent to the pair of movable contacts and a connection section extending from the guide section away from the pair of movable contacts, the connection section having a thickness greater than a spacing between the pair of movable contacts, the guide section having a thickness gradually decreasing from the thickness of the connection section to less than the spacing between the pair of movable contacts.

Preferably, the limiting component comprises a limiting sleeve which is sleeved on the guide pin in a sliding manner and a limiting clamp spring which is clamped on the guide pin, and the axial dimension of the guide pin and the limiting clamp spring is equal to the interval between the pair of movable contact pieces.

Preferably, both ends of the pair of movable contact pieces are respectively provided with a pressure adjusting part and a conductive connecting part.

Preferably, the pressure regulating member includes a first screw rod crossing the pair of movable contacts, a first nut connected to an end portion of the first screw rod penetrating the pair of movable contacts, a support sleeve slidably sleeved to a section of the first screw rod located between the pair of movable contacts, and a first compression spring arranged at a section of the first screw rod located between the movable contacts adjacent to the first nut and the first nut.

Preferably, the conductive connection member includes a second screw rod crossing the pair of movable contacts, a second nut connected to an end portion of the second screw rod penetrating out of the pair of movable contacts to be arranged at a section of the second screw rod between the movable contacts adjacent to the second nut and the second nut.

Preferably, the load switch further comprises a conductive mount rotatably connected to a section of the second screw located between the pair of movable contacts.

Preferably, the regions of the pair of movable contacts adjacent to the second screw extend towards each other to contact the protrusions of the conductive mount located therein.

Preferably, the fixed contact is a closing fixed contact and/or a grounding fixed contact of the load switch.

According to another aspect of the present utility model, there is also provided a gas insulated switchgear comprising the load switch as described above.

Additional features and advantages of the utility model 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 utility model.

Drawings

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

fig. 1 is a perspective view of a load switch according to the present utility model;

FIG. 2 is a side view of a load switch according to the present utility model;

FIG. 3 is a cross-sectional view of a load switch according to the present utility model;

fig. 4 is a side view of a knife switch device of a load switch according to the present utility model.

Reference numerals illustrate:

10-load switch; 11-a support frame; 12-closing fixed contact; 121-a thickness variation region; 121 a-a guide section; 121 b-a connecting segment; 13-grounding static contact; 14-a main shaft; 141-a crank arm; 142-a rotating shaft; 143-recesses; 15-a knife switch device; 151-movable contact pieces; 152-guide pins; 153-a limiting component; 3 a-a limit sleeve; 153 b-limiting snap springs; 154-pressure regulating means; 154 a-a first screw; 154 b-a first nut; 154 c-a support sleeve; 154 d-a first compression spring; 154 e-first gasket; 155-conductive connection means; 155 a-a second screw; 155 b-a second nut; 155 c-a second compression spring; 155 d-a second gasket; 155 e-protrusions; 16-conductive base.

Detailed Description

Referring now to the drawings, exemplary aspects of the disclosed load switch are described in detail. Although the drawings are provided to present some embodiments of the utility model, 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 by means of an intermediate layer such as an adhesive, a solder, or the like, or an intermediate member such as a connecting member, a transition member, or the like, and also two components being directly joined together without any intermediate layer such as an adhesive, a solder, or the like, or an intermediate member such as a connecting member, a transition member, or the like.

Fig. 1 to 4 show, by way of example, a load switch 10 of the present utility model, in which the load switch 10 can easily adjust the centering of the knife switch device 15 with respect to the stationary contact at the time of assembly, so that the on-off speed of the knife switch device 15 of the load switch 10 can be improved while the assembly efficiency can be improved. As shown, the load switch 10 may include a support frame 11, a stationary contact, a main shaft 14, and a knife switch device 15.

In particular, the support frame 11 may be formed by welding a plurality of plates formed by casting an insulating material such as epoxy resin or may be integrally cast by a mold. The stationary contact may be fixedly connected to the support frame 11, for example by means of screws, and both ends of the main shaft 14 may be rotatably connected to the support frame 11 by means of bushings, so as to drive the knife switch device 15 mounted thereon to move towards the stationary contact to engage with the stationary contact or to move away from the stationary contact to disengage from the stationary contact.

As shown in fig. 1 and 2, the load switch 10 in the present embodiment is a three-position switch, and the fixed contacts may include a closing fixed contact 12 and a grounding fixed contact 13 located at both sides of the rotation locus circumference of the knife switch device 15, so that the knife switch device 15 may be rotated to a closing position where the closing fixed contact 12 is engaged, an isolating position between the closing fixed contact 12 and the grounding fixed contact 13, and a grounding position where the grounding fixed contact 13 is engaged. In an embodiment not shown, the load switch 10 is a three-position switch, and the stationary contact may be a closing stationary contact 12 or a grounding stationary contact 13. In an embodiment not shown, the load switch 10 may be a disconnector, and the stationary contact may be a closing stationary contact 12. In an embodiment not shown, the load switch 10 may be a ground switch, and the stationary contact may be a ground stationary contact 13.

As shown in fig. 1, the load switch 10 in the present embodiment may be a three-phase unit, the insulating main shaft 14 may include a rotating shaft 142 with two ends rotatably connected to the supporting frame 11 and three-phase crank arms 141 spaced apart along the axial direction of the rotating shaft 142, the number of the knife switch devices 15 may be three to be respectively disposed in each of the crank arms 141, and the number of the stationary contacts may be set to be three accordingly. The three-phase crank arm 141 may be formed by casting epoxy resin together with the rotation shaft 142. Each of the bell crank arms 141 may have a recess 143 formed therein extending in a radial direction of the shaft 142 to receive the knife switch 15.

As shown in fig. 2 to 4, the knife switch device 15 may include a pair of movable contact pieces 151, a guide pin 152, and a limiting member 153. The movable contacts 151 may be symmetrically arranged with respect to each other and arranged at a side-by-side interval with respect to each other, and the interval thereof may be defined by the spacing members 153 therebetween. The movable contact pieces 151 may extend into the recess 143 of the crank arm 141 in the longitudinal direction, and the guide pin 152 may traverse the pair of movable contact pieces 151 and both ends respectively abut against the inner walls of the recess 143, whereby the pair of movable contact pieces 151 may be connected to the crank arm 141 of the main shaft 14 via the guide pin 152. As shown, the longitudinal direction is a direction extending along the radial direction of the shaft 142, and the transverse direction is a direction substantially perpendicular to the radial direction of the shaft 142.

The limiting member 153 may be snapped to a section of the guide pin 152 between the pair of movable contacts 151 and both ends may just contact each movable contact 151. When the movable contact pieces 151 are not subjected to external force as shown in the drawing, the stopper 153 prevents the movable contact pieces 151 located on both sides of the stopper 153 from moving to either side along the guide pin 152, thereby restricting the positions of the pair of movable contact pieces 151 with respect to the guide pin 152 and thus with respect to the crank arm 141.

The end of the stationary contact adjacent to the pair of movable contacts 151 may be provided with a thickness variation region 121 having an increased thickness from the end side adjacent to the pair of movable contacts 151, and the thickness variation region 121 may vary from less than the pitch of the movable contacts 151 to at least equal to the pitch between the pair of movable contacts 151. Therefore, when the load switch 10 in the present embodiment is assembled, the knife switch device 15 may be driven by the main shaft 14 to turn to the closing fixed contact 12, the thickness variation region 121 of the closing fixed contact 12 first enters between the pair of movable contacts 151, and as the knife switch device 15 and the closing fixed contact 12 are further engaged, the thickness variation region 121 contacts the pair of movable contacts 151, at this time, if the pair of movable contacts 151 are at the non-centering position with respect to the closing fixed contact 12, the thickness variation region 121 applies a force to the movable contacts 151, so as to force the pair of movable contacts 151 to move to the centering position against the friction force between the limiting member 153 and the guide pin 152, and the limiting member 153 is correspondingly pushed to the centering position by the pair of movable contacts 151. Finally, when the pair of movable contact pieces 151 continue to be engaged with the closing fixed contact 12 to the closing position and reversely rotate to be disengaged from the closing position, the limiting member 153 still clamps to the guide pin 152 to be at the centering position, so that the pair of movable contact pieces 151 still are at the centering position, and in the following closing and opening operation, the pair of movable contact pieces 151 can be directly engaged with the closing fixed contact 12 due to being at the centering position, and the centering adjustment process cannot exist.

Alternatively, the thickness variation region 121 may include a guide section 121a adjacent to the pair of movable contacts 151 and a connection section 121b extending away from the pair of movable contacts 151 from the guide section 121 a. The thickness of the connection section 121b may be constant and larger than the interval between the pair of movable contacts 151. The guide section 121a may be rounded with the connecting section 121b and gradually change in thickness, i.e., gradually decrease from the thickness of the connecting section 121b to be smaller than the distance between the pair of movable contacts 151. The guide section 121a is preferably centered with respect to the thickness direction of the connection section 121b so as to apply a force to the pair of movable contacts 151 that are offset in either direction.

As shown in fig. 4, if the pair of movable contacts 151 are biased to the right with respect to the centering position, the movable contact 151 on the right will first contact the guiding section 121a when the knife switch device 15 moves to the closing fixed contact 12, the guiding section 121a forces the movable contact 151 on the right to move to the left along the guiding pin 152, and the movable contact 151 on the left is driven by the movable contact 151 on the right to push the limiting member 153 to move to the left until the pair of movable contacts 151 and the limiting member 153 therebetween move to the centering position, and the guiding section 121a no longer applies a force to the movable contact 151.

Alternatively, the limiting member 153 may include a limiting sleeve 153a slidably coupled to the guide pin 152 and a limiting snap spring 153b snapped to the guide pin 152. The limit clamp spring 153b may be an elastic ring with an opening. The dimensions of the limit clamp spring 153b and the limit sleeve 153a along the axial direction of the guide pin 152 can be exactly equal to the distance between the pair of movable contact pieces 151, so that the movable contact pieces 151 positioned on either side of the limit part 153 can be pushed. It will be appreciated that although the stop collar 153a is shown on the left side and the stop clip 153b is shown on the right side in fig. 3 and 4, the positions of the stop collar 153a and the stop clip 153b may be interchanged in practice.

Alternatively, both ends of the pair of movable contacts 151 may be provided with a pressure adjusting part 154 and a conductive connecting part 155, respectively. The pressure adjusting member 154 and the conductive connecting member 155 may maintain a space between the pair of movable contacts 151 during an absence of an external force and until the movable contacts 151 are moved toward the guide section 121a to be equal to the space between the pair of movable contacts 151, on the one hand, and the pressure adjusting member 154 may clamp the pair of movable contacts 151 to the closing fixed contact 12, and the conductive connecting member 155 may be used to connect the conductive holder 16, on the other hand.

As shown in fig. 3 and 4, the pressure adjusting part 154 may include a first screw 154a, a first nut 154b, a support sleeve 154c, and a first compression spring 154d. The first screw 154a may pass through the pair of movable contact pieces 151 in a right direction as viewed in the drawing, and an outer surface of a front end, i.e., a right end portion thereof may be provided with threads to be coupled with the first nut 154b. The section of the first screw 154a between the pair of movable contacts 151 is slidably coupled with the supporting sleeve 154c, and the section extending beyond the movable contacts 151 is coupled with the first compression spring 154d.

The conductive connection part 155 may include a second screw 155a, a second nut 155b, and a second compression spring 155c. The second screw 155a may pass through the pair of movable contacts 151 in a right direction as viewed in the drawing, and an outer surface of a front end thereof may be provided with threads to be coupled with the second nut 155b. The section of the second screw 155a located between the pair of movable contacts 151 may be rotatably coupled with the conductive base 16, and the section extending beyond the movable contacts 151 may be coupled with the second compression spring 155c.

When the knife switch 15 moves from the thickness of the guiding section 121a equal to the distance between the pair of movable contact pieces 151 to the connecting section 121b, the pair of movable contact pieces 151 can be separated from each other by the closing fixed contact 12 positioned therein against the force of the first pressure spring 154d and the second pressure spring 155c, so that the knife switch 15 in the closing position can provide the pressure of the pair of movable contact pieces 151 to the closing fixed contact 12 by the first pressure spring 154d and the second pressure spring 155c. As can be appreciated, when the disconnecting operation is performed to disengage the disconnecting link 15 from the closing stationary contact 12, the first compression spring 154d and the second compression spring 155c return to the initial state, and the supporting sleeves 154c and the conductive seats 16 at both ends of the pair of movable contacts 151 and the limiting member 153 at the substantially longitudinal middle portion can move the pair of movable contacts 151 to the initial spacing with respect to each other.

Alternatively, as shown in fig. 3 and 4, a first spacer 154e may be provided between the head of the first screw 154a and the movable contact 151 and between the movable contact 151 and the first compression spring 154d, and a second spacer 155d may be provided between the movable contact 151 and the second compression spring 155c to increase the contact area between the pressure adjusting member 154 and the conductive connecting member 155 and the movable contact 151.

Alternatively, as shown in fig. 3 and 4, the region where the pair of movable contacts 151 is connected to the second screw 155a may be provided with protrusions 155e extending toward each other, and the protrusions 155e of each movable contact 151 may contact the conductive sockets 16 located therein. In this way, firstly, it is possible to facilitate distinguishing between the end for connecting the pressure regulating member 154 and the end for connecting the conductive connecting member 155, and secondly, it is possible to reduce the contact area between the movable contact piece 151 and the conductive holder 16 to facilitate the relative rotation between the conductive holder 16 and the movable contact piece 151.

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 utility model and is not to be construed as limiting the scope of the utility model. 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 utility model, and it is intended to be within the scope of the utility model.

Claims (10)

1. A load switch (10), the load switch (10) comprising a support frame (11), a stationary contact fixedly mounted to the support frame (11), a main shaft (14) rotatably mounted to the support frame (11), and a knife switch device (15) driven by the main shaft (14) to engage with or disengage from the stationary contact, characterized in that the main shaft (14) is provided with a recess (143) for accommodating the knife switch device (15), the knife switch device (15) comprising:

a pair of movable contacts (151) arranged in a side-by-side spaced relation to each other and extending into the recess (143);

a guide pin (152) that traverses the pair of movable contacts (151) and both ends of which are respectively abutted to the inner walls of the recess (143), such that the pair of movable contacts (151) is connected to the main shaft (14) via the guide pin (152);

a limiting member (153) which is clamped to a section of the guide pin (152) between the pair of movable contacts (151) and both ends of which are respectively contacted with the movable contacts (151) so as to limit the movement of the pair of movable contacts (151) relative to the guide pin (152) under the condition that the pair of movable contacts (151) are not subjected to external force;

the thickness change area (121) is arranged at the end part of the fixed contact adjacent to the pair of movable contact pieces (151), the thickness of the thickness change area (121) is changed from being smaller than the distance between the pair of movable contact pieces (151) to at least equal to the distance between the pair of movable contact pieces (151), so that when the pair of movable contact pieces (151) are driven by the main shaft (14) to move to contact the thickness change area (121) of the fixed contact, the thickness change area (121) forces the pair of movable contact pieces (151) at the non-centering position to push the limiting part (153) to move relative to the guide pin (152) until the limiting part (153) moves to the centering position.

2. The load switch (10) according to claim 1, wherein the thickness variation region (121) includes a guide section (121 a) adjacent to the pair of movable contacts (151) and a connection section (121 b) extending from the guide section (121 a) away from the pair of movable contacts (151), the connection section (121 b) having a thickness greater than a spacing between the pair of movable contacts (151), the guide section (121 a) having a thickness that tapers from the thickness of the connection section (121 b) to less than the spacing between the pair of movable contacts (151).

3. The load switch (10) according to claim 1, wherein the limit member (153) includes a limit sleeve (153 a) slidably fitted to the guide pin (152) and a limit clip (153 b) snap-fitted to the guide pin (152), and the guide pin (152) and the limit clip (153 b) are equal in size in an axial direction of the guide pin (152) to a distance between the pair of movable contacts (151).

4. The load switch (10) according to claim 2, wherein both ends of the pair of movable contacts (151) are provided with a pressure adjusting member (154) and a conductive connecting member (155), respectively.

5. The load switch (10) of claim 4, wherein the pressure regulating member (154) includes a first screw (154 a) traversing the pair of movable contacts (151), a first nut (154 b) connected to the first screw (154 a) passing out of an end of the pair of movable contacts (151), a support sleeve (154 c) slidably sleeved to a section of the first screw (154 a) between the pair of movable contacts (151), and a first compression spring (154 d) disposed at a section of the first screw (154 a) between the movable contacts (151) adjacent to the first nut (154 b) and the first nut (154 b).

6. The load switch (10) of claim 4, wherein the electrically conductive connection member (155) includes a second screw (155 a) traversing the pair of movable contacts (151), a second nut (155 b) connected to an end of the second screw (155 a) that passes out of the pair of movable contacts (151) to be disposed at a section of the second screw (155 a) between the movable contacts (151) adjacent to the second nut (155 b) and the second nut (155 b).

7. The load switch (10) of claim 6, wherein the load switch (10) further comprises a conductive mount (16) rotatably connected to a section of the second screw (155 a) located between the pair of moving contacts (151).

8. The load switch (10) of claim 7, wherein regions of the pair of movable contacts (151) adjacent the second screw (155 a) extend toward each other to contact the protrusion (155 e) of the conductive socket (16) therein.

9. Load switch (10) according to claim 1, characterized in that the stationary contact is a closing stationary contact (12) and/or a grounding stationary contact (13) of the load switch (10).

10. Gas-insulated switchgear, characterized in that it comprises a load switch (10) according to any one of claims 1 to 9.