阅读说明：本技术 一种动触头基体和三工位隔离接地开关 (Moving contact substrate and three-station isolation grounding switch ) 是由 王小东 朱传运 张皓祺 李伟强 董斌 黄鑫 秦泳 于 2020-05-14 设计创作，主要内容包括：本发明涉及电气设备技术领域,具体涉及一种动触头基体和三工位隔离接地开关。动触头基体为细长管状结构,管壁上设有相对布置的两个长孔,长孔的延伸方向与动触头基体的长度方向一致,至少一个长孔的至少一个端部设有引导面,引导面用于引导触头座上安装的触指滑过而使触指顺利压缩,引导面包括与长孔侧部壁面连接的侧部引导面和与长孔的端部壁面连接的端部引导面,在动触头基体相对动触头座导向移动、且触指经过长孔端部时,引导面可引导触指滑过长孔端部,端部引导面和侧部引导面对触指的压缩具有引导作用,可实现触指顺利压缩,上述动触头基体应用在三工位隔离接地开关中,可提高动触头与动触头座在相对滑动过程中导电接触的可靠性和稳定性。(The invention relates to the technical field of electrical equipment, in particular to a moving contact substrate and a three-station isolation grounding switch. The moving contact base body is of a slender tubular structure, two long holes which are oppositely arranged are arranged on the tube wall, the extending direction of each long hole is consistent with the length direction of the moving contact base body, at least one end part of at least one long hole is provided with a guide surface, the guide surface is used for guiding a contact finger arranged on the contact seat to slide so as to enable the contact finger to be smoothly compressed, the guide surface comprises a side part guide surface connected with the side part wall surface of the long hole and an end part guide surface connected with the end part wall surface of the, when the moving contact base body moves relative to the moving contact seat in a guiding way and the contact finger passes through the end part of the long hole, the guide surface can guide the contact finger to slide through the end part of the long hole, the guide surface of the end part and the guide surface of the side part have a guide function on the compression of the contact finger, the contact finger can be smoothly compressed, the moving contact matrix is applied to the three-station isolation grounding switch, the reliability and the stability of the conductive contact of the moving contact and the moving contact seat in the relative sliding process can be improved.)

1. A movable contact base body is of an elongated tubular structure, two long holes are oppositely arranged on a tube wall, the extending direction of each long hole is consistent with the length direction of the movable contact base body, and the movable contact base body is characterized in that at least one end part of at least one long hole is provided with a guide surface, the guide surface is used for guiding a contact finger installed on a contact seat to slide through so as to enable the contact finger to be smoothly compressed, and the guide surface comprises a side part guide surface connected with the side part wall surface of the long hole and an end part guide surface connected with the end part wall surface of.

2. The movable contact base body of claim 1 wherein the side guide surface is a flared surface extending in the longitudinal direction of the elongated hole and gradually sloping outward in the width direction of the elongated hole.

3. The movable contact base body according to claim 1 or 2, wherein the side guide surface is an arc-shaped guide surface transitionally connected with an outer wall surface of the movable contact base body.

4. The movable contact base body according to claim 1 or 2, wherein two of the side guide surfaces at the same end of the elongated hole are provided, and are respectively located on both sides in the width direction of the elongated hole.

5. The movable contact base body according to claim 1 or 2, wherein the end guide surface is an inclined surface extending gradually radially outward from the end wall surface of the elongated hole to the outer wall surface of the movable contact base body.

6. The movable contact substrate according to claim 1 or 2, wherein at least one of the elongated holes is provided with a notch for allowing the gear to enter and exit the movable contact substrate.

7. The movable contact substrate of claim 6 wherein the notch is located at one end of the slot and the guide surface is located at an end of the slot opposite the notch.

8. A three-position isolating grounding switch comprising:

a housing;

the movable contact seat is arranged in the shell and is provided with a guide channel;

the moving contact is movably assembled in the guide channel;

the rack is fixed on the movable contact;

the gear is positioned in the moving contact and is provided with a gear shaft, the gear shaft penetrates through the moving contact, and the gear shaft penetrates through two ends of the moving contact and is rotatably assembled on the moving contact seat;

its characterized in that, three station isolation earthing switch still include:

the contact finger is arranged on the movable contact seat;

the moving contact comprises a moving contact substrate, and the moving contact substrate is the moving contact substrate in any one of claims 1 to 5;

the gear shaft penetrates through the two long holes in the moving contact base body.

9. The three-position isolating grounding switch of claim 8, wherein the two long holes are a first long hole and a second long hole respectively, the guide surface is disposed on the first long hole, the second long hole is provided with a notch for the gear to enter and exit from the interior of the movable contact base body, and two ends of the contact finger are circumferentially disposed on two sides of the second long hole in the width direction and circumferentially bypass the first long hole.

10. The three-position disconnecting and grounding switch according to claim 9, wherein the notch is located at one end of the second long hole, and the guide surface is located at the end of the long hole opposite to the notch.

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a moving contact substrate and a three-station isolation grounding switch.

Background

The three-station isolating and grounding switch integrates the functions of the isolating switch and the grounding switch, has the advantages of low cost, small size, high safety and the like, and gradually replaces the traditional isolating switch and the grounding switch which are independently arranged.

The invention patent application document with the publication number of CN102254730B and publication date of 2013, 11 and 27 discloses a three-position isolation grounding switch, the three-station isolation grounding switch comprises a shell, wherein a movable contact seat is arranged in the shell, a guide channel is arranged in the movable contact seat, a movable contact is movably guided and assembled in the guide channel, a grounding fixed contact and an isolation fixed contact are respectively arranged at two ends of the guide channel of the movable contact seat in the shell, an installation chamber is arranged in the movable contact, a rack is arranged in the installation chamber and extends along the moving direction of the movable contact, two guide long holes which are oppositely arranged are arranged on the outer wall of the movable contact, an insulating rod penetrates through the two guide long holes and is rotatably assembled on the movable contact seat, a gear is rotatably assembled on the insulating rod and is meshed with the rack, so as to drive the rack and the whole moving contact to reciprocate in the guide channel through the rotation of the insulating rod driving gear to realize the switching among the three stations.

The three-station isolation grounding switch has the advantages that the gear structure for driving the moving contact is arranged in the moving contact, the structure is relatively compact, the moving contact is in sliding contact with the guide channel of the moving contact seat to achieve electric conduction, the electric conduction stability and the reliability are poor, and the problems of concentrated heating and contact ablation are easily caused.

Disclosure of Invention

The invention aims to provide a three-station isolation grounding switch, which aims to solve the technical problems of poor conductive stability and poor reliability of sliding conductive contact between a moving contact and a moving contact seat in the existing three-station isolation grounding switch; the invention also aims to provide a moving contact substrate which is suitable for the three-station isolating grounding switch and ensures stable and reliable conductive contact between the moving contact and the moving contact seat when in use.

The three-station isolation grounding switch adopts the following technical scheme: three station isolation earthing switch includes: a housing; the movable contact seat is arranged in the shell and is provided with a guide channel; the moving contact is movably assembled in the guide channel; the rack is fixed on the movable contact; the gear is positioned in the moving contact and is provided with a gear shaft, the gear shaft penetrates through the moving contact, and the gear shaft penetrates through two ends of the moving contact and is rotatably assembled on the moving contact seat; the contact finger is arranged on the movable contact seat; the moving contact comprises a moving contact base body, the moving contact base body is of a slender tubular structure, two long holes which are oppositely arranged are arranged on the tube wall, the extending direction of each long hole is consistent with the length direction of the moving contact base body, at least one end part of at least one long hole is provided with a guide surface, the guide surface is used for guiding a contact finger installed on the contact seat to slide so as to enable the contact finger to be smoothly compressed, and the guide surface comprises a side part guide surface connected with the side part wall surface of the long hole and an end part guide surface connected with the end; the gear shaft penetrates through the two long holes in the moving contact base body.

The invention has the beneficial effects that: in three-station isolation earthing switch, be provided with on the movable contact seat and touch the finger, the accessible touches reliability and the stability that the finger improves conductive contact between moving contact and the moving contact seat, and at the gliding in-process of moving contact base member relative movable contact seat, the guide face can guide to touch the finger and slide the slot hole tip, when touching the finger through the slot hole tip, tip guide face and lateral part guide face on the slot hole have the guide effect to the compression of touching the finger, help realizing touching the smooth compression of finger, can improve moving contact and movable contact seat in relative slip in-process conductive contact's reliability and stability, and then improve three-station isolation earthing switch work's reliability.

Further, the side guide surface is an expanding surface extending in the longitudinal direction of the long hole and gradually inclining outward in the width direction of the long hole.

The beneficial effects are as follows: the structure setting of above-mentioned flaring face can play the guide effect to the compression of touching the finger in slot hole width direction, helps touching the smooth compression of finger, helps realizing three station isolation earthing switch's normal work.

Furthermore, the side guide surface is an arc guide surface transitionally connected with the outer wall surface of the moving contact base body.

The beneficial effects are as follows: the structure of the arc-shaped guide surface can be used for homogenizing the electric field at the position of the side guide surface on the moving contact base body, reducing the discharge breakdown at the position of the side guide surface and improving the reliability of the three-station isolation grounding switch.

Further, two side guide surfaces at the same end of the long hole are provided and are respectively positioned at two sides of the long hole in the width direction.

The beneficial effects are as follows: above-mentioned structural arrangement can be when touching the finger like watchband touches the finger and the assembly of spring touch finger, need not to consider the incline direction when touching the finger compression, can reduce the assembly skill requirement to the assembly workman, the three station isolation earthing switch's of being convenient for assembly.

Furthermore, the end guide surface is an inclined surface which gradually inclines outwards from the end wall surface of the long hole to the outer wall surface of the moving contact base body.

The beneficial effects are as follows: the inclined plane is convenient to process, has a good guiding effect on the compression of the contact finger, and is beneficial to realizing the normal work of the three-station isolation grounding switch.

Furthermore, the two long holes are respectively a first long hole and a second long hole, the guide surface is arranged on the first long hole, the second long hole is provided with a notch, the notch is used for enabling the gear to enter and exit the inside of the moving contact base body, and two ends of the contact finger are circumferentially positioned on two sides of the second long hole in the width direction and circumferentially bypass the first long hole.

The beneficial effects are as follows: the structure setting of above-mentioned opening can make things convenient for the gear dismouting, and the dismouting of the three-station isolation earthing switch of being convenient for, the structure setting of touching the finger can make the touch finger avoid the second slot hole, avoids the second slot hole to influence the slip of the relative moving contact base member of touch finger on the movable contact seat.

Furthermore, the notch is arranged at one end of the second long hole, and the guide surface is arranged at one end of the long hole, which is opposite to the notch.

The beneficial effects are as follows: the structure can ensure that the contact finger on the moving contact seat has larger sliding stroke relative to the moving contact base body in the process that the moving contact base body slides relative to the moving contact seat.

Furthermore, the guide surface arranged on the moving contact base body and the contact finger arranged on the moving contact seat are positioned on the same side of the gear shaft and are only positioned on one side of the gear shaft.

The beneficial effects are as follows: the structure arrangement can ensure that the contact finger on the movable contact seat has larger sliding stroke relative to the movable contact base body while avoiding the opening.

Furthermore, the moving contact base is provided with at least two guide sleeves, and the at least two guide sleeves are respectively arranged on two sides of the gear shaft.

The beneficial effects are as follows: the guiding sleeve and the guiding sleeve are arranged at positions which can ensure the guidance of relative sliding between the moving contact base body and the moving contact seat, and ensure the structural stability of the three-station isolation grounding switch in the working process.

The moving contact matrix adopts the following technical scheme: the moving contact base body is of a slender tubular structure, two long holes which are oppositely arranged are formed in the tube wall, the extending direction of each long hole is consistent with the length direction of the moving contact base body, at least one end portion of at least one long hole is provided with a guide surface, the guide surface is used for guiding a contact finger installed on the contact seat to slide so as to enable the contact finger to be smoothly compressed, and the guide surface comprises a side portion guide surface connected with the side portion wall surface of the long hole and an end portion guide surface connected with the end portion wall surface of the.

The invention has the beneficial effects that: at least one tip of at least one slot hole of moving contact base member is equipped with the guide face, this guide face includes lateral part guide face and end guide face, at the in-process that the moving contact base member moved relatively the moving contact seat direction, the guide face can guide to touch the finger and slide the slot hole tip, and when touching the finger and passing through the slot hole tip, end guide face and lateral part guide face have the guide effect to the compression of touching the finger, help realizing touching the smooth compression of finger, above-mentioned moving contact base member is used in three-station isolation earthing switch, can improve the reliability and the stability of moving contact and moving contact seat in relative slip in-process conductive contact.

Further, the side guide surface is an expanding surface extending in the longitudinal direction of the long hole and gradually inclining outward in the width direction of the long hole.

The beneficial effects are as follows: the structure of the outward-expanding surface can guide the compression of the contact finger in the width direction of the long hole, and the smooth compression of the contact finger is facilitated.

Furthermore, the side guide surface is an arc guide surface transitionally connected with the outer wall surface of the moving contact base body.

The beneficial effects are as follows: the structure of the arc guide surface can homogenize the electric field at the position of the guide surface of the upper side part of the moving contact base body, reduce the discharge breakdown at the position of the guide surface of the side part,

further, two side guide surfaces at the same end of the long hole are provided and are respectively positioned at two sides of the long hole in the width direction.

The beneficial effects are as follows: the structure can be used for assembling contact fingers such as watchband contact fingers and spring contact fingers without considering the inclined direction of the contact fingers during compression, and can reduce the requirement on the assembling skill of an assembling worker

Furthermore, the end guide surface is an inclined surface which gradually inclines outwards from the end wall surface of the long hole to the outer wall surface of the moving contact base body.

The beneficial effects are as follows: the inclined plane is convenient to process, and the inclined plane has a good guiding effect on the compression of the contact finger.

Furthermore, at least one slot hole is provided with a notch, and the notch is used for enabling the gear to enter and exit the moving contact base body.

The beneficial effects are as follows: the structure of the opening can facilitate the disassembly and assembly of the gear.

Furthermore, the notch is arranged at one end of the long hole, and the guide surface is arranged at one end of the long hole, which is opposite to the notch.

The beneficial effects are as follows: the structure can enable the contact finger on the moving contact seat to have larger sliding stroke relative to the moving contact base body in the process of sliding relative to the moving contact base body.

Drawings

Fig. 1 is a schematic structural diagram of a three-position isolating and grounding switch in embodiment 1 of the invention;

fig. 2 is a schematic structural diagram of the moving contact assembly in embodiment 1 of the three-position isolating grounding switch of the present invention;

fig. 3 is a schematic structural diagram of positions among a moving contact base, a contact finger and a moving contact base in embodiment 1 of the three-position disconnecting and grounding switch of the present invention, wherein the moving contact base does not show a structure for assembling a rack;

fig. 4 is a schematic structural diagram of a moving contact substrate in the embodiment 1 of the three-position isolating and grounding switch of the present invention;

fig. 5 is a schematic structural view of another angle of the moving contact base body in the embodiment 1 of the three-position isolating and grounding switch of the invention;

FIG. 6 is an enlarged view of the structure at A in FIG. 5;

in the figure: the structure comprises a shell 1, a shell 2, an operating mechanism 3, a basin insulator 4, a movable contact seat 5, a movable contact base body 6, a central insert 7, a grounding movable contact 8, an isolating movable contact 9, a rack 10, a gear 11, a gear shaft 12, a first long hole 12, a second long hole 13, a gap 14, a groove 15, a contact finger 16, a side wall 17, an end wall 18, an end guide surface 19, a side guide surface 20 and an arc transition surface 21.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.

It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The features and properties of the present invention are described in further detail below with reference to examples.

The specific embodiment 1 of the three-position isolating grounding switch of the invention:

as shown in fig. 1, the three-position isolation grounding switch includes a housing 1 and an operating mechanism 2 connected to the housing 1, the housing 1 is a hollow cavity, a basin-type insulator 3 is hermetically installed on the housing 1, and a moving contact assembly fixedly connected to the basin-type insulator 3 is disposed in the housing 1.

In this embodiment, as shown in fig. 2, the movable contact assembly includes a movable contact base 4 and a movable contact, and the movable contact base 4 is fixed on the basin-shaped insulator 3 and is electrically connected to the central insert 6 at the central position of the basin-shaped insulator 3. The movable contact seat 4 is provided with an internal guide channel, and the movable contact is arranged in the guide channel and can move in a guide way relative to the movable contact seat 4 under the driving action of the operating mechanism 2.

In this embodiment, as shown in fig. 1 and 2, a grounding fixed contact and an isolating fixed contact are further installed at two ends of the housing 1 in the length direction of the guiding channel, the moving contact includes a moving contact base 5, the moving contact base 5 is arranged to extend along the length direction of the guiding channel, the moving contact further includes a grounding moving contact 7 and an isolating moving contact 8 respectively fixed at two ends of the moving contact base 5 in the length direction, the grounding moving contact 7 is electrically inserted into the grounding fixed contact after the moving contact moves to a certain position relative to the moving contact base 4 towards the grounding fixed contact, so that the three-position isolating grounding switch is at a grounding position where the main break of the grounding switch is connected, the isolating moving contact 8 is electrically inserted into the isolating fixed contact after the moving contact moves to a certain position relative to the moving contact base 4 towards the isolating fixed contact, so that the three-position isolating, when the moving contact is located at the middle position of the guide channel, the main fracture of the isolating switch and the main fracture of the grounding switch are disconnected.

In this embodiment, as shown in fig. 2 to 4, the movable contact base 5 is a slender circular tube structure, an installation chamber is provided in the movable contact base 5, a rack 9 is installed in the installation chamber, the rack 9 is fixed on the inner side wall of the movable contact base 5, and the rack 9 extends along the length direction of the movable contact base 5, a gear 10 meshed with the rack 9 is further provided in the corresponding installation chamber, the gear 10 is configured with a gear shaft 11, the gear 10 is in running-stop fit with the gear shaft 11, both ends of the gear shaft 11 penetrate through the outer wall surface of the movable contact base 5, two long holes arranged along the radial direction of the movable contact base 5 are provided on the outer wall surface of the movable contact base 5, the two long holes are used for avoiding the gear shaft 11 penetrating through the movable contact base 5, so as to realize the guiding movement of the movable contact base 5 relative to the movable. The two ends of the gear shaft 11 penetrating through the moving contact base body 5 are respectively assembled with the moving contact base 4 in a rotating mode through bearings, one end of the gear shaft 11 is rotatably inserted into the inner wall face of the moving contact base 4, the other end of the gear shaft passes through the moving contact base 4, the end portion of the gear shaft 11 passing through the moving contact base 4 is in transmission connection with an output shaft of the operating mechanism 2, a square groove is formed in the end portion of the gear shaft 11 passing through the moving contact base 4 and used for being matched with an insulating rod (not shown) in a rotation stopping insertion mode, and therefore the output shaft of the operating mechanism 2 drives the gear.

In this embodiment, as shown in fig. 4, the two long holes are arranged in the vertical direction, the two long holes are respectively a first long hole 12 far away from the operating mechanism 2 and a second long hole 13 close to the operating mechanism 2, a notch 14 is formed in one end of the second long hole 13 close to the grounding fixed contact, the notch 14 is communicated with the second long hole 13, and the notch 14 is used for the gear 10 to pass through and enables the gear 10 to be located in the installation chamber and meshed with the rack 9, so that the gear 10 is convenient to disassemble and assemble, and further, the whole three-station isolation grounding switch is convenient to assemble. The meshing teeth on the rack 9 protrude the inner wall surface of the moving contact base body 5 to avoid interference with the inner wall surface of the moving contact base body 5 in the rotating process of the gear 10.

In this embodiment, as shown in fig. 2, the moving contact base 5 slides in the guiding channel in a guiding manner, a groove 15 is formed on the moving contact base 4 and on an inner wall surface contacting with the moving contact base 5, a guiding sleeve is installed in the groove 15, the guiding sleeve is made of an abrasion-resistant material, the moving contact base 5 and the moving contact base 4 are in guiding sliding fit through the guiding sleeve, and can avoid the abrasion and ablation of the moving contact matrix 5 to reduce the service life of the moving contact and the whole three-station isolation grounding switch in the process that the moving contact matrix 5 slides relative to the moving contact seat 4 in a guiding way, three guiding sleeves are arranged in the embodiment and are positioned at two sides of the gear shaft 11 in the length direction of the guiding channel, one side of the moving contact base body is provided with one, and the other side of the moving contact base body is provided with two, so that a good guiding effect can be provided for guiding movement of the moving contact base body 5 in the moving contact base 4, and the service life of the moving contact component can be prolonged.

In the present embodiment, as shown in fig. 2 and 3, in order to achieve stable and reliable conductive contact between the movable contact base body 5 and the movable contact base 4 during the guiding movement of the movable contact base body relative to the movable contact base. The moving contact seat 4 is provided with a concave part on the inner wall surface of the guide channel, the concave part is positioned at the side of the gear shaft 11 and is close to the isolated static contact, the concave part is internally provided with a contact finger 16, the contact finger 16 is a watchband contact finger, and the moving contact base body 5 and the moving contact seat 4 are in conductive contact through the contact finger 16, so that the stability and reliability of the conductive contact between the moving contact and the moving contact seat can be improved, and the phenomena of concentrated heating and ablation of the moving contact are reduced. The contact finger 16 is arranged around the outer peripheral surface of the movable contact base body 5, two ends of the contact finger 16 are circumferentially positioned at two sides of the width direction of the second long hole 13, and the contact finger 16 circumferentially bypasses the first long hole 12, so that the contact finger 16 avoids the second long hole 13, and the influence of the second long hole 13 on the sliding of the contact finger 16 relative to the movable contact base body 5 is avoided.

In this embodiment, in the three-station isolated ground switch with the above structure, the movable contact base 5 has a relatively long stroke that slides relative to the movable contact base 4, the contact finger located in the first long hole 12 is in an uncompressed free state, and in the process that the movable contact base 5 moves towards the grounded fixed contact, the uncompressed contact finger can cross the end of the first long hole 12, and the contact finger in the free state can be compressed after crossing the end of the first long hole 12.

In this embodiment, in order to prevent the free contact finger from being blocked by the wall surface of the first long hole 12 when the free contact finger passes over the end of the first long hole 12, as shown in fig. 5 and 6, a guide surface is provided at the end of the first long hole 12 close to the isolated fixed contact, the guide surface can guide the contact finger to pass through the hole section of the first long hole, and the guide surface has a guiding function for the compression of the contact finger, which helps to smoothly compress the contact finger 16 passing through the end of the first long hole 12. Specifically, the two long holes are each an oblong hole, the hole wall surface of the long hole includes two side wall surfaces 17 extending in the long hole length direction, and further includes two end wall surfaces 18 located at the ends in the long hole length direction and connecting the two side wall surfaces 17, the end wall surfaces 18 are semicircular arc surfaces, the guide surface includes a side guide surface 20 connected to the side wall surface 17 of the first long hole 12 and an end guide surface 19 connected to the end wall surface 18 of the first long hole 12 near the isolated stationary contact side, the side guide surfaces 20 are provided in two, the two side guide surfaces 20 are located on both sides in the width direction of the first long hole 12, and are connected to the two side wall surfaces 17 of the first long hole 12, respectively. In this embodiment, the two side guide surfaces 20 can be arranged in the assembling process of the watchband contact finger or the spring contact finger in other embodiments, the inclined direction of the contact finger during compression is not required to be considered, the assembling skill requirement on an assembling worker can be reduced, and the three-position isolating grounding switch can be assembled conveniently.

As shown in fig. 5 and 6, the side guide surfaces 20 are arranged to extend in the longitudinal direction of the first long hole 12, and the side guide surfaces 20 are gradually inclined toward the outside of the first long hole 12 in the width direction of the first long hole 12, so that the two side guide surfaces 20 form two outwardly-expanded surfaces. The end guide surface 18 extends in the longitudinal direction of the first long hole 12, and the end guide surface 18 is an inclined surface extending from the end wall surface of the first long hole 12 to the outer wall surface of the movable contact base body while gradually inclining outward. In the process that the movable contact base body 5 moves towards the isolation fixed contact, the end guide surface 19 can guide the contact finger to slide through the end of the first long hole, when the contact finger 16 passes through the end of the first long hole 12, the end guide surface 19 and the two side guide surfaces can play a role in guiding compression of the contact finger in the length direction of the first long hole 12, the arrangement of the side guide surface 20 which is an outward expanding surface can also play a role in guiding compression of the contact finger in the width direction of the first long hole 12, the smooth compression of the contact finger 16 is facilitated, the phenomena that the contact finger is blocked and damaged or the movable contact is scratched by the contact finger 16 due to blocking of the contact finger 16 and the wall surface of the first long hole 12 can be reduced, and the stability and the reliability of the conductive connection between the movable contact and the movable contact base in the three-station grounding switch are facilitated.

As shown in fig. 5 and 6, an arc transition surface 21 is provided between the hole wall surface and the outer wall surface of the movable contact base body at the two long hole positions, so as to reduce the local discharge breakdown phenomenon at the hole edge position by equalizing the electric field intensity at the long hole edge position, in this embodiment, the side guide surface 20 is an arc guide surface, the arc transition surface 21 between the side wall surface 17 of the first long hole 12 and the outer wall surface of the movable contact base body is transitionally connected with the arc guide surface, and the arc guide surface is transitionally connected with the outer wall surface of the movable contact base body, so that the processing of the side guide surface 20 is facilitated, the electric field intensity at the connecting position of the side guide surface 20 and the outer wall surface of the movable contact base body.

As shown in fig. 5 and 6, the end guide surface 19 and the outer wall surface of the movable contact base body, the end guide surface 19 and the end wall surface 18, and the end guide surface 19 and the side guide surface 20 are connected by arc transition so as to equalize the electric field intensity at the end portion of the second elongated hole 13 close to the isolated stationary contact side and reduce the occurrence of the discharge breakdown phenomenon.

The specific embodiment 2 of the three-position isolating grounding switch of the invention:

it differs from the specific example 1 in that: in order to improve the conductive connection between the movable contact seat and the movable contact, contact fingers are installed between the movable contact base bodies on two sides of the gear shaft and the movable contact seat, guide surfaces are arranged at two ends of the first long hole, and the movable contact base bodies are used for moving towards the fixed contacts at the two ends, so that the contact fingers smoothly pass through the corresponding end parts of the first long hole, the smooth compression of the contact fingers is facilitated, the clamping stagnation of the contact fingers, the damage of the contact fingers or the scratch of the movable contact fingers can be reduced, and the normal work of the three-station isolation grounding switch can be facilitated.

In this embodiment, the two ends of the contact finger close to the grounded static contact in the circumferential direction are respectively located at the two sides of the opening in the width direction of the second long hole, so that the contact finger avoids the opening, and the opening is prevented from influencing the sliding of the contact finger relative to the moving contact base body.

Specific embodiment 3 of the triplexer isolation grounding switch of the present invention:

it differs from the specific example 1 in that: the contact finger that realizes electrically conductive contact between moving contact base member and the moving contact seat is the spring contact finger, and the spring contact finger arranges around moving contact base member outer peripheral face, and the spring contact finger is walked around first slot hole and second slot hole, all sets up the guide face at the tip that is close to the isolation static contact of first slot hole and second slot hole to the guide spring contact finger draws the tip of first slot hole and second slot hole, and when the spring contact finger crossed first slot hole tip and second slot hole tip, the guide spring contact finger compressed.

Specific embodiment 4 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: in the structure shown in fig. 3, the fingers are each arranged obliquely toward the clockwise direction, and since the fingers are easily caught by the side wall surface at the front side in the clockwise direction and are not caught by the side wall surface at the rear side in the clockwise direction in the process that the fingers pass through the end portion of the first long hole, only one side guide surface is provided, and the side guide surface is transitionally connected to the side wall surface at the front side in the clockwise direction.

In other embodiments, in the structure shown in fig. 3, when the finger is obliquely arranged toward the counterclockwise direction, the side guide surface is transitionally connected with the side wall surface at the front side in the counterclockwise direction.

Specific embodiment 5 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: two lateral part guide surfaces extend on the length direction of first slot hole and arrange, and on the length direction of first slot hole, the distance between two lateral part guide surfaces is equal, two lateral part guide surfaces are the arc guide surface, in-process that the finger passes through first slot hole tip is being touched, arc guide surface and tip guide surface have the guide effect to the compression of touching the finger in the length direction of first slot hole, help realizing touching the smooth compression of finger, can reduce and touch the finger jamming, touch the finger damage or touch the probability that the finger fish tail moved contact, help improving three-station isolation earthing switch moving contact and moving contact base between conductive connection's reliability and stability, can ensure three-station isolation earthing switch's normal work.

Specific embodiment 6 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: a chamfer is arranged between the hole wall surface of the first long hole and the outer wall surface of the moving contact base body, the chamfer is respectively in arc transitional connection with the hole wall surface and the outer wall surface of the moving contact base body, two corresponding side guide surfaces are inclined guide surfaces in arc transitional connection with the chamfer, and the inclined guide surfaces are respectively in arc transitional connection with the outer wall surface of the moving contact base body and the outer wall surface of the end part, so that the electric field intensity at the end part of the first long hole is uniform, and the occurrence of the local breakdown discharge phenomenon is reduced. And in the process that the contact finger passes through the end part of the first long hole, the contact finger is beneficial to realizing the smooth compression of the contact finger under the matching action of the inclined guide surface and the end part guide surface, the probability that the contact finger is blocked, the contact finger is damaged or the contact finger scratches the moving contact can be reduced, the reliability and the stability of the conductive connection between the moving contact and the moving contact seat in the three-station isolation grounding switch can be improved, and the normal work of the three-station isolation grounding switch can be ensured.

Specific embodiment 7 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: the second slot hole is not provided with a notch, the width dimension of the second slot hole is larger than the radial dimension of the gear, so that the gear can enter the mounting chamber of the moving contact base body through the second slot hole.

The specific embodiment 8 of the three-position isolating grounding switch of the invention:

it differs from the specific example 1 in that: the tip guide face extends to arrange on the length direction of first slot hole, and the tip guide face for the tip wall face of following first slot hole extends to the arcwall face of moving contact base member outer wall face to the outside slope gradually, when the tip that the finger passed through first slot hole, the arcwall face has the guide effect to the compression of touching the finger on the length direction of first slot hole, helps realizing touching the smooth compression of finger.

Embodiment 9 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: the opening is arranged in the length direction of the second long hole and is positioned in the middle of the second long hole section of the gear shaft close to the grounding static contact side, and the contact finger is positioned at the end part of the movable contact seat close to the isolation static contact, so that the contact finger is prevented from passing through the opening when the movable contact base body moves relative to the movable contact seat.

The specific embodiment 10 of the three-position isolating grounding switch of the invention:

it differs from the specific example 1 in that: the opening is arranged on the length direction of the second long hole and close to the end part of the isolation static contact, and the two ends of the contact finger in the circumferential direction are positioned on the two sides of the opening in the width direction of the second long hole, so that the opening influences the smooth compression of the contact finger in the moving process of the moving contact to the grounding static contact.

The specific embodiment 11 of the three-position isolating grounding switch of the present invention:

it differs from the specific example 1 in that: the moving contact base body is in guiding sliding fit with the moving contact seat, and a guide sleeve is not arranged on the moving contact seat.

Embodiment 12 of the three-position disconnecting and grounding switch of the present invention:

it differs from the specific example 1 in that: the guide sleeve is only provided with one guide sleeve, is close to the middle position of the movable contact seat in the length direction of the guide channel, and has a certain length so as to guide the movement of the movable contact matrix in the movable contact seat.

In other embodiments, the number of the guide sleeves is two, and the two guide sleeves are respectively arranged on two sides of the gear shaft in the length direction of the guide channel.

The invention relates to a concrete implementation mode of a moving contact substrate, which comprises the following steps:

the structure of the moving contact base body is the same as that of the moving contact base body in embodiments 1 to 12 of the three-position isolation grounding switch, and details are not repeated here.

The above description is only a preferred embodiment of the present invention, and not intended to limit the present invention, the scope of the present invention is defined by the appended claims, and all structural changes that can be made by using the contents of the description and the drawings of the present invention are intended to be embraced therein.