CN220138190U - Grounding switch for combined isolating switch - Google Patents

Abstract

The utility model provides a grounding switch for a combined isolating switch, wherein the combined isolating switch comprises a first mounting cavity, and the grounding switch comprises: the shell is internally provided with a second installation cavity, and the shell is installed on the combined isolating switch so as to enable the second installation cavity to be communicated with the first installation cavity; the fixed contact is fixedly arranged in the first mounting cavity; the movable contact is positioned in the second mounting cavity and comprises a main connecting plate, and the movable contact is rotatably arranged around a preset axis positioned at the first end of the main connecting plate so as to be contacted with or separated from the fixed contact; wherein the main connecting plate is an arc-shaped plate body; or the main connecting plate comprises a first plate body and a second plate body which are mutually perpendicular and connected, so that the problems of complex overall structure, large volume and high manufacturing cost of the grounding switch for the combined isolating switch in the prior art are solved.

Description

Grounding switch for combined isolating switch

Technical Field

The utility model relates to the technical field of gas-insulated metal-enclosed switchgear, in particular to a grounding switch for a combined isolating switch.

Background

In the field of gas-insulated metal-enclosed switchgear, the earthing switch for a combined disconnector has the following roles:

(1) When the switch equipment needs to be overhauled, the switch equipment and the loop thereof are safely grounded.

(2) When the switch equipment is subjected to acceptance test and annual overhaul, main loop resistance measurement is required to be carried out on the circuit breaker and the disconnecting switch which need to be overhauled through the grounding switch for combining the disconnecting switch.

(3) When equipment is checked and accepted and leaves a factory, the corresponding isolating and circuit breaker fracture is required to be subjected to power frequency withstand voltage and lightning impulse tests by closing the grounding switches used for combining the isolating switches at different positions.

(4) In addition, there is a class of grounding switches for combination disconnectors that have the ability to switch off the induced current in the line and to switch off the short-circuit current at least 2 times.

In order to meet the basic performance requirements of the grounding switch for the combined isolating switch, when the grounding switch for the combined isolating switch is designed, a movable contact, a fixed contact and a transmission sealing structure which can be separated and combined are needed, and the traditional grounding switch for the combined isolating switch can be designed into a metal shell for sealing gas, a movable contact capable of realizing separation and closing actions, a fixed contact corresponding to the movable contact, a contact seat, an insulating grounding terminal, an operating mechanism, a limit structure for limiting the travel of the switch and other parts. Because the movable contact needs to form a large enough safety distance with the fixed contact to meet the insulation performance requirement between the breaks when the movable contact is separated from the fixed contact, the voltage class is often about high, the volume of the grounding switch for the combined isolating switch is about large, and in some practical applications, the overall cost of the grounding switch body structure is increased because the grounding switch for the combined isolating switch has to be too large for independently designing a shell and matching the shell.

In a grounding switch for a combination disconnector as described in patent (ZL 112563065 a), the composition of the switch comprises: the shell, the moving contact sliding electric connecting device, the fixed contact, the moving contact transmission structure and other parts, and the number of parts of the whole structure is large; the movable side body part of the grounding switch for the combined isolating switch is still of a traditional round bar contact telescopic structure, the movable contact is converted into linear motion of the contact by a rotary sealing shaft through a transmission structure, the movable contact is cylindrical and adopts telescopic reciprocating motion to realize closing and opening, and the fixed contact adopts a circular profile, so that the switch shell needs to be designed to be large enough to accommodate the movable contact and the transmission structure which shrink back during opening, and the fixed contact adopts the circular profile, so that the whole structure is complex, the volume is large, and the manufacturing cost is high.

Disclosure of Invention

The utility model mainly aims to provide a grounding switch for a combined isolating switch, which solves the problems of complex overall structure, large volume and high manufacturing cost of the grounding switch for the combined isolating switch in the prior art.

In order to achieve the above object, the present utility model provides a grounding switch for a combination disconnecting switch, the combination disconnecting switch including a first mounting cavity, the grounding switch including: the shell is internally provided with a second installation cavity, and the shell is installed on the combined isolating switch so as to enable the second installation cavity to be communicated with the first installation cavity; the fixed contact is fixedly arranged in the first mounting cavity; the movable contact is positioned in the second mounting cavity and comprises a main connecting plate, and the movable contact is rotatably arranged around a preset axis positioned at the first end of the main connecting plate so as to be contacted with or separated from the fixed contact; wherein the main connecting plate is an arc-shaped plate body; or the main connecting plate is composed of a first plate body and a second plate body which are mutually perpendicular and connected.

Further, the grounding switch for the combined disconnecting switch comprises a shielding piece, the shielding piece is arranged in the second mounting cavity and is located on one side, close to the first mounting cavity, of the second mounting cavity, an avoidance groove is formed in the shielding piece, the first end of the main connecting plate is rotatably mounted in the second mounting cavity around a preset axis, and accordingly the second end of the main connecting plate moves between the first mounting cavity and the second mounting cavity through the avoidance groove.

Further, the shielding piece is an arc-shaped plate body protruding towards one side far away from the fixed contact, and the part of the bottom surface of the cavity of the shell for forming the second installation cavity is also of an arc-shaped structure so as to jointly enclose an arc-shaped cavity.

Further, the grounding switch for the combined isolating switch comprises a transmission structure and a sealing shaft sleeve, wherein the sealing shaft sleeve is fixedly connected with the shell, and the transmission structure comprises a rotating shaft which is rotatably arranged in the sealing shaft sleeve and used for being connected with the first end of the moving contact, so that the moving contact is driven to rotate by rotating the rotating shaft, and the second end of the moving contact is contacted with or separated from the fixed contact.

Further, the first end of the main connecting plate is used for being connected with the rotating shaft; the second end of the main connecting plate is provided with an elastic contact finger; the fixed contact is provided with an opening part for inserting the second end of the main connecting plate to be in electric contact with the elastic contact guide.

Further, a first end of the main connecting plate is provided with a rotary connecting contact which is rotatably inserted into the sealing shaft sleeve and is detachably connected with the rotating shaft; and/or the transmission structure comprises a first sealing ring and a second sealing ring which are clamped between the rotating shaft and the sealing shaft sleeve and are arranged at intervals, the first sealing ring is positioned at one end of the rotating shaft far away from the moving contact, and the second sealing ring is positioned at one end of the rotating shaft close to the moving contact.

Further, the grounding switch for the combined disconnecting switch comprises a conductive connection part arranged between the rotary connection contact and the sealing shaft sleeve so as to realize conductive connection between the rotary connection contact and the sealing shaft sleeve; and/or the grounding switch for the combined disconnecting switch comprises an annular supporting part arranged between the rotary connecting contact and the sealing shaft sleeve so as to support the rotary connecting contact and realize relative rotation between the rotary connecting contact and the sealing shaft sleeve.

Further, the sealing shaft sleeve is a cylindrical barrel and a connecting flange arranged on the outer side of the cylindrical barrel, and a rotating shaft mounting hole for clearance fit with the rotating shaft is formed in the cylindrical barrel; the connecting flange is connected with the shell through a first fastener, and the connecting flange is in conductive contact with the shell.

Further, the transmission structure further comprises a position fixing part, wherein the position fixing part comprises a limiting state and a releasing state, the limiting state is installed at one end, far away from the moving contact, of the rotating shaft and is fixedly connected with the sealing shaft sleeve to limit the rotating shaft, and the releasing state is detached from the rotating shaft and the sealing shaft sleeve to release the rotating shaft.

Further, the position fixing part is detachably connected with the sealing shaft sleeve through a second fastener; the position fixing part is provided with a first polygonal hole, and one end of the rotating shaft, which is close to the position fixing part, is provided with a first polygonal shaft section for being in plug-in fit with the first polygonal hole; and/or one side of the position fixing part far away from the rotating shaft is provided with a position indicating structure for indicating that the grounding switch for combining the isolating switch is at a switching-off position or a switching-on position when the position fixing part is in a limiting state; and/or the position fixing part is provided with an installation lock hole for hanging the five-prevention lock.

By applying the technical scheme of the utility model, the grounding switch for the combined isolating switch comprises a first mounting cavity, and the grounding switch comprises: the shell is internally provided with a second installation cavity, and the shell is installed on the combined isolating switch so as to enable the second installation cavity to be communicated with the first installation cavity; the fixed contact is fixedly arranged in the first mounting cavity; the movable contact is positioned in the second mounting cavity and comprises a main connecting plate, and the movable contact is rotatably arranged around a preset axis positioned at the first end of the main connecting plate so as to be contacted with or separated from the fixed contact; wherein the main connecting plate is an arc-shaped plate body; or the main connecting plate is composed of a first plate body and a second plate body which are mutually perpendicular and connected. Therefore, the grounding switch for the combined isolating switch reduces the space occupied by the motion of the moving contact and the volume of the grounding switch for the combined isolating switch by arranging the main connecting plate of the moving contact as the arc-shaped plate body or a structure formed by the first plate body and the second plate body which are mutually perpendicular, and solves the problems of complex integral structure, large volume and high manufacturing cost of the grounding switch for the combined isolating switch in the prior art.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

FIG. 1 shows a schematic view of an embodiment of a grounding switch for a combination disconnector according to the utility model in a breaking position;

fig. 2 shows a schematic view of an embodiment of a grounding switch for a combination disconnector according to the utility model in a closed position;

FIG. 3 shows a cross-sectional view of the grounding switch for the combination disconnector shown in FIG. 1;

fig. 4 shows a front view of the stationary contact of the grounding switch for the combination disconnector shown in fig. 1;

fig. 5 shows an assembled schematic view of the housing, moving contact and shield of the grounding switch for the combination disconnector shown in fig. 1.

Wherein the above figures include the following reference numerals:

1. a housing; 11. a second mounting cavity;

2. a moving contact; 20. a main connecting plate; 21. an elastic contact finger; 22. a rotary connection contact;

3. a transmission structure; 30. a third fastener; 31. a position fixing part; 32. a first seal ring; 33. a rotating shaft; 34. a second seal ring;

4. a stationary contact; 41. an opening portion;

5. sealing the shaft sleeve; 51. a cylindrical barrel; 52. a connecting flange; 53. a rotation shaft mounting hole; 54. a conductive mounting groove; 55. a support portion mounting groove; 56. a contact mounting hole; 57. a first annular groove; 58. a second annular groove;

6. a conductive connection portion; 7. a shield; 8. an annular support portion; 9. a first mounting cavity.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1 to 5, the present utility model provides a grounding switch for a combination disconnector comprising a first mounting cavity 9, the grounding switch comprising: the shell 1, there is second installation cavity 11 in the shell 1, the shell 1 is installed on the combined isolating switch, in order to make the second installation cavity 11 communicate with first installation cavity 9; the fixed contact 4, the fixed contact 4 is fixedly installed in the first installation cavity 9; a moving contact 2, the moving contact 2 being located in the second installation cavity 11, the moving contact 2 including a main connection plate 20, the moving contact 2 being rotatably disposed about a predetermined axis located at a first end of the main connection plate 20 to be in contact with or separated from the stationary contact 4; wherein the main connecting plate 20 is an arc plate body; or the main connection plate 20 is composed of a first plate body and a second plate body which are perpendicular to each other and connected.

In this way, the grounding switch for the combined isolating switch reduces the space occupied by the motion of the moving contact 2 and the volume of the grounding switch for the combined isolating switch by arranging the main connecting plate 20 of the moving contact 2 into the arc-shaped plate body or a structure formed by the first plate body and the second plate body which are perpendicular to each other, and solves the problems of complex integral structure, large volume and high manufacturing cost of the grounding switch for the combined isolating switch in the prior art.

As shown in fig. 1, 2 and 5, the grounding switch for the combined disconnecting switch comprises a shielding member 7, wherein the shielding member 7 is arranged in a second mounting cavity 11 and is positioned on one side of the second mounting cavity 11, which is close to a first mounting cavity 9, an avoidance groove is formed in the shielding member 7, a first end of a main connecting plate 20 is rotatably arranged in the second mounting cavity 11 around a preset axis, so that a second end of the main connecting plate 20 moves between the first cavity and the second cavity through the avoidance groove, and when the grounding switch for the combined disconnecting switch is in a switching-off position, a movable contact 2 can be contracted in the second mounting cavity 11 of a shell 1, so that reasonable electric field distribution is facilitated, and the safety performance of the grounding switch for the combined disconnecting switch is improved.

Preferably, when the main connection board 20 is an arc-shaped board, the shielding member 7 is an arc-shaped board protruding toward a side far away from the fixed contact 4, and a portion of the housing 1 for forming the bottom surface of the second mounting cavity 11 is also an arc-shaped structure so as to jointly enclose an arc-shaped cavity adapted to the shape of the main connection board 20.

The grounding switch for the combined isolating switch comprises a transmission structure 3 and a sealing shaft sleeve 5, wherein the sealing shaft sleeve 5 is fixedly connected with a shell 1, the transmission structure 3 comprises a rotating shaft 33 rotatably arranged in the sealing shaft sleeve 5 and used for being connected with the first end of a moving contact 2, and the moving contact 2 is driven to rotate by rotating the rotating shaft 33 so as to enable the second end of the moving contact 2 to be contacted with or separated from a fixed contact 4.

In the grounding switch for the combined disconnecting switch, the rotating shaft 33 is driven to rotate manually or electrically to drive the movable contact 2 fixed on the rotating shaft 33 inside the shell 1 to swing, so that the movable contact 2 and the fixed contact 4 are electrically connected or disconnected, and the electrical equipment connected with the fixed contact 4 is electrically connected or disconnected with a grounding system through the movable contact 2 and the shell 1, so that the safe grounding of the electrical equipment is realized.

The shell 1 is used for fixing, accommodating and shielding the moving contact 2, the transmission structure 3 and the like, the moving contact 2 and the elastic contact finger 21 attached to the moving contact are contracted in the shell 1 so as to be used for closing and communicating the fixed contact 4, so that the purpose that a conductor is grounded through a grounding switch for combining a disconnecting switch is achieved, the shell 1 plays a role in shielding the moving contact, an electric field between the arc part of the moving contact 2 and the fixed contact 4 is uniformly distributed, and the sealing shaft sleeve 5 is used for installing the rotatable moving contact 2 so as to realize electric connection between the moving contact 2 and the shell 1 through rotary electric connection.

Specifically, the housing 1 may be an aluminum alloy casting structure or a machined structure, the outline of which is hemispherical, one surface of the housing 1 may be used to butt-joint a flange surface of a housing of the combined isolating switch, and the housing 1 is provided with a hole parallel to the flange surface for fixing the sealing sleeve 5.

As shown in fig. 1 and 2, a first end of the main connection plate 20 is used to connect with a rotation shaft 33; wherein, the second end of the main connecting plate 20 is provided with an elastic contact finger 21; the stationary contact 4 is provided with an opening 41 for inserting the second end of the main connection plate 20 into conductive contact with the elastic contact finger 21.

Specifically, the second end of the main connection plate 20 is provided with an elastic contact finger mounting groove for mounting the elastic contact finger 21; the cross section of the opening 41 is U-shaped, and silver plating layers are arranged on the two side surfaces of the opening 41 to improve the reliability of electrical connection between the moving contact 2 and the fixed contact 4.

As shown in fig. 3, the first end of the main connection plate 20 is provided with a rotary connection contact 22, and the main connection plate 20 and the rotary connection contact 22 are integrally formed or detachably connected, and the rotary connection contact 22 is rotatably inserted in the sealing sleeve 5 and detachably connected with the rotation shaft 33.

As shown in fig. 3, the ground switch for the combination disconnecting switch includes a conductive connection portion 6 provided between the rotary connection contact 22 and the seal bushing 5 to achieve a conductive connection between the rotary connection contact 22 and the seal bushing 5; and/or the earthing switch for the combined disconnecting switch includes an annular supporting portion 8 provided between the rotary connection contact 22 and the seal bushing 5 to support the rotary connection contact 22 and to effect relative rotation between the rotary connection contact 22 and the seal bushing 5.

Alternatively, the conductive connection 6 is a spring finger or a watchband finger or a structure capable of achieving flexible conductive connection.

As shown in fig. 3, the rotary connection contact 22 and the rotating shaft 33 are connected by a third fastener 30, a fastener through hole through which the third fastener 30 passes is provided in the rotary connection contact 22, a fastener threaded hole for threaded connection with the third fastener 30 is provided in the rotating shaft 33, and the third fastener 30 passes through the fastener through hole and is screwed into the fastener threaded hole.

Specifically, a second polygonal hole is disposed at an end of the rotary connection contact 22 near the rotation shaft 33, and a second polygonal shaft section for being in plug-in fit with the second polygonal hole is disposed at an end of the rotation shaft 33 near the rotary connection contact 22, so that relative rotation between the rotary connection contact 22 and the rotation shaft 33 is limited by plug-in fit of the second polygonal hole and the second polygonal shaft section.

As shown in fig. 3, the transmission structure 3 includes a first sealing ring 32 and a second sealing ring 34 which are interposed between the rotating shaft 33 and the sealing sleeve 5 and are disposed at intervals, the first sealing ring 32 is located at one end of the rotating shaft 33 away from the moving contact 2, and the second sealing ring 34 is located at one end of the rotating shaft 33 close to the moving contact 2.

As shown in fig. 3, the sealing sleeve 5 is a cylindrical tube 51 and a connecting flange 52 provided outside the cylindrical tube 51, and a rotation shaft mounting hole 53 for clearance fit with the rotation shaft 33 is provided in the cylindrical tube 51.

Wherein the connection flange 52 is connected to the housing 1 by a first fastener, and the connection flange 52 is in conductive contact with the housing 1.

As shown in fig. 3, a first annular groove 57 for mounting the first seal ring 32 is further provided on the inner wall surface of the rotation shaft mounting hole 53, the first annular groove 57 being located at one end of the rotation shaft mounting hole 53 away from the moving contact 2; the inner wall surface of the rotation shaft mounting hole 53 is also provided with a second annular groove 58 for mounting the second seal ring 34, and the second annular groove 58 is positioned at one end of the rotation shaft mounting hole 53 close to the moving contact 2.

As shown in fig. 3, the inner wall surface of the contact mounting hole 56 is provided with a plurality of conductive mounting grooves 54 for mounting the conductive connection portions 6 and a plurality of support portion mounting grooves 55 for mounting the annular support portion 8, and the plurality of conductive mounting grooves 54 are provided at intervals on one side of the support portion mounting grooves 55 close to the rotation shaft mounting hole 53 for mounting the plurality of sets of conductive connection portions 6, respectively.

As shown in fig. 3, the transmission structure 3 further includes a position fixing portion 31, and the position fixing portion 31 includes a limit state of being mounted at one end of the rotation shaft 33 away from the moving contact 2 and fixedly connected with the sealing sleeve 5 to limit the rotation shaft 33, and a release state of being detached from the rotation shaft 33 and the sealing sleeve 5 to release the rotation shaft 33, so as to lock or unlock a closing position or a opening position of the grounding switch for the combination disconnecting switch.

Wherein the position fixing part 31 is detachably connected with the sealing shaft sleeve 5 through a second fastener; the position fixing portion 31 is provided with a first polygonal hole, and one end of the rotating shaft 33, which is close to the position fixing portion 31, is provided with a first polygonal shaft section for being in plug-in fit with the first polygonal hole.

Specifically, a position indicating structure is provided on a side of the position fixing portion 31 away from the rotation shaft 33 to indicate that the grounding switch for combining the disconnecting switch is in the opening position or the closing position when the position fixing portion 31 is in the limit state; and/or the position fixing part 31 is provided with an installation lock hole for hanging the five-prevention lock, and when the five-prevention lock is locked, one of the second fasteners for connecting the position fixing part 31 and the sealing shaft sleeve 5 cannot be removed, so that the purpose of preventing misoperation is achieved.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

by applying the technical scheme of the utility model, the grounding switch for the combined isolating switch comprises a first mounting cavity 9, and the grounding switch comprises: the shell 1, there is second installation cavity 11 in the shell 1, the shell 1 is installed on the combined isolating switch, in order to make the second installation cavity 11 communicate with first installation cavity 9; the fixed contact 4, the fixed contact 4 is fixedly installed in the first installation cavity 9; a moving contact 2, the moving contact 2 being located in the second installation cavity 11, the moving contact 2 including a main connection plate 20, the moving contact 2 being rotatably disposed about a predetermined axis located at a first end of the main connection plate 20 to be in contact with or separated from the stationary contact 4; wherein the main connecting plate 20 is an arc plate body; or the main connection plate 20 is composed of a first plate body and a second plate body which are perpendicular to each other and connected. In this way, the grounding switch for the combined isolating switch reduces the space occupied by the motion of the moving contact 2 and the volume of the grounding switch for the combined isolating switch by arranging the main connecting plate 20 of the moving contact 2 into the arc-shaped plate body or a structure formed by the first plate body and the second plate body which are perpendicular to each other, and solves the problems of complex integral structure, large volume and high manufacturing cost of the grounding switch for the combined isolating switch in the prior art.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present utility model. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present utility model, it should be understood that the azimuth or positional relationships indicated by the azimuth terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal", and "top, bottom", etc., are generally based on the azimuth or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present utility model; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present utility model.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (10)

1. A grounding switch for a combination disconnector, characterized in that the combination disconnector comprises a first mounting cavity (9), the grounding switch comprising:

the shell (1), there is second installation cavity (11) in the said shell (1), the said shell (1) is installed on the said combination isolating switch, in order to make the said second installation cavity (11) communicate with said first installation cavity (9);

the fixed contact (4) is fixedly arranged in the first mounting cavity (9);

a moving contact (2), wherein the moving contact (2) is positioned in the second mounting cavity (11), the moving contact (2) comprises a main connecting plate (20), and the moving contact (2) is rotatably arranged around a preset axis positioned at the first end of the main connecting plate (20) so as to be contacted with or separated from the fixed contact (4);

wherein,

the main connecting plate (20) is an arc-shaped plate body; or alternatively

The main connecting plate (20) is composed of a first plate body and a second plate body which are mutually perpendicular and connected.

2. The earthing switch for a combination disconnector according to claim 1, characterized in that the earthing switch for a combination disconnector comprises a shielding member (7), said shielding member (7) being arranged in said second mounting cavity (11) and being located at a side of said second mounting cavity (11) close to said first mounting cavity (9), said shielding member (7) being provided with a relief groove, a first end of said main connection plate (20) being rotatably mounted in said second mounting cavity (11) about said predetermined axis, such that a second end of said main connection plate (20) is moved between said first mounting cavity (9) and said second mounting cavity (11) through said relief groove.

3. Grounding switch for a combined disconnector according to claim 2, characterized in that the shield (7) is an arc-shaped plate body protruding towards the side remote from the stationary contact (4), the part of the housing (1) forming the bottom surface of the second mounting cavity (11) also being of arc-shaped construction so as to together enclose an arc-shaped cavity.

4. The earthing switch for a combination disconnector according to claim 1, characterized in that the earthing switch for a combination disconnector comprises a transmission structure (3) and a sealing sleeve (5), the sealing sleeve (5) being fixedly connected with the housing (1), the transmission structure (3) comprising a rotation shaft (33) rotatably arranged in the sealing sleeve (5) for connection with a first end of the moving contact (2) for driving the moving contact (2) in rotation by rotating the rotation shaft (33) for bringing a second end of the moving contact (2) into contact with or separating from the stationary contact (4).

5. The earthing switch for a combination disconnector according to claim 4, characterized in that a first end of the main connection plate (20) is adapted to be connected with the rotation shaft (33); wherein,

the second end of the main connecting plate (20) is provided with an elastic contact finger (21);

the fixed contact (4) is provided with an opening (41) for inserting the second end of the main connecting plate (20) to be in conductive contact with the elastic contact finger (21).

6. A grounding switch for a combination disconnector as claimed in claim 4,

a first end of the main connecting plate (20) is provided with a rotary connecting contact (22), and the rotary connecting contact (22) is rotatably inserted into the sealing shaft sleeve (5) and is detachably connected with the rotating shaft (33); and/or

The transmission structure (3) comprises a first sealing ring (32) and a second sealing ring (34) which are arranged between the rotating shaft (33) and the sealing shaft sleeve (5) in a clamping mode at intervals, the first sealing ring (32) is located at one end, far away from the moving contact (2), of the rotating shaft (33), and the second sealing ring (34) is located at one end, close to the moving contact (2), of the rotating shaft (33).

7. The grounding switch for a combination disconnector as claimed in claim 6, characterized in that,

the grounding switch for the combined disconnecting switch comprises a conductive connecting part (6) arranged between the rotary connecting contact (22) and the sealing shaft sleeve (5) so as to realize conductive connection between the rotary connecting contact (22) and the sealing shaft sleeve (5); and/or

The earthing switch for the combined disconnecting switch comprises an annular supporting part (8) arranged between the rotary connecting contact (22) and the sealing shaft sleeve (5) so as to support the rotary connecting contact (22) and realize relative rotation between the rotary connecting contact (22) and the sealing shaft sleeve (5).

8. The grounding switch for a combination disconnector according to claim 4, characterized in that the sealing sleeve (5) is a cylindrical body (51) and a connecting flange (52) arranged outside the cylindrical body (51), a rotation shaft mounting hole (53) for clearance fit with the rotation shaft (33) being provided in the cylindrical body (51); the connecting flange (52) is connected with the shell (1) through a first fastener, and the connecting flange (52) is in conductive contact with the shell (1).

9. The earthing switch for a combination disconnector according to claim 4, characterized in that the transmission structure (3) further comprises a position fixing part (31), the position fixing part (31) comprising a limit state mounted at an end of the rotating shaft (33) remote from the moving contact (2) and fixedly connected with the sealing sleeve (5) to limit the rotating shaft (33) and a release state detached from the rotating shaft (33) and the sealing sleeve (5) to release the rotating shaft (33).

10. The grounding switch for a combination disconnector as claimed in claim 9,

the position fixing part (31) is detachably connected with the sealing shaft sleeve (5) through a second fastener; the position fixing part (31) is provided with a first polygonal hole, and one end, close to the position fixing part (31), of the rotating shaft (33) is provided with a first polygonal shaft section which is used for being in plug-in fit with the first polygonal hole; and/or

A position indicating structure is arranged on one side of the position fixing part (31) far away from the rotating shaft (33) so as to indicate that the grounding switch for combining the isolating switch is at a switching-off position or a switching-on position when the position fixing part (31) is in the limit state; and/or

The position fixing part (31) is provided with an installation lock hole for hanging the five-prevention lock.