CN219626532U - Compact low-wear long-service-life turntable type isolation switch structure - Google Patents

Abstract

The utility model relates to the field of tapping switches of primary electric equipment, in particular to a compact type low-abrasion long-service-life rotary disc type isolation switch structure, which comprises a fixed contact insulation supporting disc fixed on a switch support, wherein a concave cavity for installing a movable contact insulation rotary disc is formed in the fixed contact insulation supporting disc, 6 lower fixed contacts are distributed on the bottom surface of the concave cavity at intervals along the circumferential direction, 3 arc-shaped movable contacts are uniformly distributed on the upper end surface and the lower end surface of the movable contact insulation rotary disc along the circumference respectively, the two arc-shaped movable contacts corresponding to the upper end surface and the lower end surface are in conductive connection, 3 upper fixed contacts are uniformly distributed on the upper end surface of the fixed contact insulation supporting disc along the circumference, and one end of each upper fixed contact is respectively abutted against one arc-shaped movable contact positioned on the upper end surface of the movable contact insulation rotary disc. The isolating change-over switch is beneficial to enabling the vacuum on-load tapping switch to be compact in structure and solving the insulation problem of a small space range.

Description

Compact low-wear long-service-life turntable type isolation switch structure

Technical Field

The utility model relates to the field of tapping switches of primary electric equipment, in particular to a compact low-abrasion long-service-life turntable type isolation change-over switch structure.

Background

In order to ensure the stability of the power supply voltage of the power system, 80% of large main transformer is provided with an on-load tap switch for automatic voltage regulation. The basic principle of the on-load tap-changer is that the tap of the transformer winding is switched under the condition of not interrupting load current, and the number of turns of the winding is changed, so that the voltage transformation ratio is changed, and the voltage is adjusted. To enable an on-load tap changer to perform tap change under loaded conditions, it is necessary to be satisfied that during switching, the load current cannot be interrupted, and short circuits cannot occur between taps; the working circuit comprises a transition circuit, a selection circuit and a voltage regulating circuit. The operating conditions of the tap changer require frequent operation and the electrical lifetime requires hundreds of thousands of times.

As an important component of the vacuum on-load tap-changer, the reliability and service life of the isolating switch greatly influence the reliability and service life of the vacuum on-load tap-changer. For each tap change operation of the on-load tap changer, the isolating switch also needs to perform a switching operation, as shown in fig. 1, the isolating switch J needs to perform a switching operation from J1 to J2 or from J2 to J1, so that the service life of the isolating switch is also required to be hundreds of thousands of times.

Since the change-over switch J is a two-way switch, there are three contact terminals: j1, J2 and the common terminal J, in order to ensure the insulation strength between the three contact terminals, a certain space distance between the three contact terminals must be ensured during design. The on-load tap-changer is of a three-phase structure, so that 9 ends are arranged, and a certain space distance between the two ends is ensured, so that the on-load tap-changer is large in size.

And because the conventional change-over switch adopts an opening disconnecting link form, the contact pressure of the disconnecting link and the fixed contact is maintained by a spring of the disconnecting link after the switch is closed in place, and the opening spacing of the disconnecting link is slightly smaller than the thickness of the fixed contact during the opening so as to ensure that the opening of the disconnecting link is jacked by the fixed contact after the switch is closed in place, so that the contact pressure is maintained, and larger impact force can be generated during the closing process, thereby influencing the mechanical life of the switch.

Disclosure of Invention

The utility model aims to provide a compact low-abrasion long-service-life turntable type isolation switch structure, which is beneficial to enabling a vacuum on-load tap-changer to be compact in structure and solving the insulation problem of a small space range.

The technical scheme of the utility model is as follows: the utility model provides a compact low wearing and tearing high life carousel formula isolation switch structure, includes the fixed insulating supporting disk of static contact on the switch support, be provided with the cavity that is used for installing the insulating carousel of moving contact on the insulating supporting disk of static contact, the bottom surface of cavity is along the circumference interval distribution 6 down static contact, the upper and lower terminal surface of the insulating carousel of moving contact is along the circumference respectively 3 arc movable contact of equipartition, and the two arc movable contact conductive connection that upper and lower terminal surface corresponds, the even distribution of static contact up end along circumference has 3 upper static contacts, the one end of upper static contact respectively with one be located the arc movable contact looks butt of the insulating carousel up end of moving contact.

Further, the lower static contact plates are uniformly distributed and embedded on the bottom surface of the concave cavity of the static contact insulating support disc, and an insulating material friction plate with a low friction coefficient is embedded between two lower static contact plates of the same phase, and the surface height of the insulating material friction plate is flush with the surface of the lower static contact plate.

Further, the arc movable contact pieces are respectively embedded on the upper end face and the lower end face of the movable contact insulating turntable, and the two arc movable contact pieces corresponding to the upper end face and the lower end face are electrically connected through conductive rivets.

Further, the length of the arc-shaped movable contact piece positioned on the upper end face of the movable contact insulating turntable is longer than the distance between two adjacent lower static contact pieces.

Further, the fixed contact insulating support plate is provided with mounting grooves which are radially led into the concave cavity at intervals along the circumferential direction, and the other end of the upper fixed contact is mounted in the mounting grooves.

Further, the other ends of the upper fixed contacts are respectively connected with a wire inlet seat.

Further, the fixed contact insulating support disc is also provided with a pressing mechanism which enables the upper fixed contact to be pressed on the arc-shaped movable contact piece on the upper end face of the movable contact insulating rotary disc and applies pressure downwards to realize conductive contact.

Further, the pressing mechanism comprises a stud vertically penetrating through the upper fixed contact and in threaded connection with the fixed contact insulation support disc, and a contact pressure spring with the lower end propped against the upper fixed contact is sleeved on the stud.

Compared with the prior art, the utility model has the following advantages:

1. according to the change-over switch for the vacuum on-load tap-changer, three groups of change-over movable contact pieces are circumferentially and uniformly distributed on the upper surface and the lower surface of the insulating rotary disk, the conductive contact pieces on the upper surface and the lower surface of each group are riveted through conductive rivets embedded in the insulating rotary disk, conductive connection and mechanical fixation are realized, three groups of 6 lower static contact pieces (three groups J1 and J2) and three groups of 3 upper static contact pieces (three common ends J) corresponding to the conductive contact pieces are respectively arranged on the upper surface and the lower surface of the insulating rotary disk of the static contact pieces, and a sufficient distance is kept between the 6 lower static contact pieces and the 3 upper static contact pieces, so that 9 ends are ensured to be in a limited space, the space distance between different potential conductors is ensured, sufficient insulating strength is ensured, and the insulation problem of a small space range is solved.

2. According to the change-over switch, the contacts are in planar sliding contact, contact abrasion is small, insulating materials with low friction coefficient, which are flush with the lower static contact, are embedded between the two lower static contact pieces of the same phase in the static contact insulating support disc, so that smooth transition of the lower arc-shaped movable contact piece from one lower static contact piece to the other lower static contact piece is ensured to be free from impact, the rotation power consumption of the insulating turntable is reduced, and the service life of the switch is prolonged.

Drawings

FIG. 1 is a schematic diagram of the operation of an isolating switch;

FIG. 2 is a schematic diagram of the structure of the present utility model;

FIG. 3 is an A-direction view of FIG. 2 in accordance with the present utility model;

FIG. 4 is a cross-sectional E-E view of FIG. 3 in accordance with the present utility model;

FIG. 5 is a cross-sectional view of F-F of FIG. 3 in accordance with the present utility model;

FIG. 6 is a first structure diagram of the cooperation of the fixed contact insulating support disc and the movable contact insulating rotary disc;

fig. 7 is a second matching structure diagram of the fixed contact insulation supporting disc and the moving contact insulation rotating disc;

FIG. 8 is a schematic view of a structure of a static contact insulation support plate according to the present utility model;

FIG. 9 is a top partial cross-sectional view of the stationary contact insulation support plate of the present utility model;

FIG. 10 is a schematic diagram of a mechanism for mating a movable contact insulating turret with an upper stationary contact and a lower stationary contact according to the present utility model;

fig. 11 is a bottom view of the moving contact insulating turntable of the present utility model;

in the figure: 10. a static contact insulation supporting disc; 11. a cavity; 12. a phase A lower static contact a1;13. a phase A lower static contact a 2; 14. a static contact on the A phase; 15. an insulating material friction plate; 16. a connecting end; 17. a mounting groove; 18. a wire inlet seat; 20. a moving contact insulating rotary table; 21. a moving contact piece on the phase A; 22. a phase A lower movable contact piece; 23. a conductive rivet; 24. a rotating shaft; 31. a stud; 32. and a contact pressure spring.

Detailed Description

In order to make the above features and advantages of the present utility model more comprehensible, embodiments accompanied with figures are described in detail below, but the present utility model is not limited thereto.

Referring to fig. 2 to 11

The utility model provides a compact low wearing and tearing high life carousel formula isolation switch structure, includes the fixed insulating supporting disk 10 of static contact on the switch support, be provided with the cavity 11 that is used for installing the insulating carousel of moving contact on the insulating supporting disk of static contact, the bottom surface of cavity has set up 6 static contact down along the circumferencial direction interval. The 6 lower static contact pieces are an A-phase lower static contact piece a1 12 and an A-phase lower static contact piece a2 13 respectively, the other four lower static contact pieces are a B-phase lower static contact piece B1, a B-phase lower static contact piece B2, a C-phase lower static contact piece C1 and a C-phase lower static contact piece C2, and the two lower static contact pieces with the same phase are adjacently arranged. The upper end face and the lower end face of the movable contact insulating turntable are respectively and uniformly distributed with 3 arc-shaped movable contact pieces along the circumference, and the two arc-shaped movable contact pieces corresponding to the upper end face and the lower end face are in conductive connection. The 3 arc movable contact pieces positioned on the upper end face are respectively an A-phase upper movable contact piece 21, a B-phase upper movable contact piece and a C-phase upper movable contact piece, and the 3 arc movable contact pieces positioned on the lower end face are respectively an A-phase lower movable contact piece 22, a B-phase lower movable contact piece and a C-phase lower movable contact piece. The upper end face of the static contact insulation support disc is uniformly provided with 3 upper static contacts along the circumference, and the 3 upper static contacts are A-phase upper static contacts 14. One end of the upper static contact is respectively abutted with an arc-shaped movable contact piece positioned on the upper end face of the movable contact insulating rotary table, so that the upper static contact is in conductive contact with the arc-shaped movable contact piece positioned on the upper end face of the movable contact insulating rotary table.

In this embodiment, in order to better install the lower static contact, the lower static contact is uniformly distributed and embedded on the bottom surface of the concave cavity of the static contact insulation supporting disc, and an insulating material friction plate 15 with a low friction coefficient is embedded between two lower static contact of the same phase, so that insulation is realized between two lower static contact of the same phase. The upper surface of the insulating material friction plate is flush with the upper surface of the lower static contact plate, so that smooth transition is ensured to be free from impact when the arc movable contact plate positioned on the lower end surface is transferred from one lower static contact plate to the other lower static contact plate, the rotation power consumption of the insulating turntable is reduced, and the service life of the switch is prolonged.

In this embodiment, the insulating material friction plate may be made of a low friction coefficient material such as polytetrafluoroethylene.

In this embodiment, the lower stationary contact has a connection end 16 extending from a side wall of the cavity of the stationary contact insulating support plate to facilitate wire connection.

In this embodiment, the arc movable contact pieces are respectively embedded on the upper and lower end surfaces of the movable contact insulating turntable, and the conductive connection is realized between the two arc movable contact pieces corresponding to the upper and lower end surfaces through the conductive rivet 23 embedded on the movable contact insulating turntable.

In this embodiment, the length of the arc-shaped movable contact piece positioned on the upper end surface of the movable contact insulating turntable is greater than the distance between two adjacent lower static contact pieces. The length of the arc-shaped movable contact piece positioned on the lower end surface of the movable contact insulating turntable is the same as or slightly shorter than that of the lower static contact piece.

In this embodiment, in order to drive the moving contact insulating turntable to rotate, a rotating shaft 24 penetrating downward through the fixed contact insulating supporting disk is fixed on the moving contact insulating turntable, so that the moving contact insulating turntable rotates around the center of the rotating shaft with the rotating shaft as a support.

In this embodiment, the fixed contact insulating support plate is provided with mounting grooves 17 radially led into the concave cavity at intervals along the circumferential direction at the periphery of the concave cavity, and the other ends of the upper fixed contacts are mounted in the mounting grooves and respectively connected with a wire inlet seat 18 so as to introduce power.

In this embodiment, in order to better apply pressure to the arc movable contact with the upper fixed contact, ensure reliable conductive contact, the fixed contact insulation supporting plate is further provided with a pressing mechanism that makes the upper fixed contact press on the arc movable contact on the upper end surface of the movable contact insulation turntable and applies pressure downward to realize conductive contact.

Specifically, the compressing mechanism comprises a stud 13 vertically penetrating through one end of the upper fixed contact and being in threaded connection with the fixed contact insulation supporting disc, a structure for cushioning the other end of the upper fixed contact is arranged between the lower end face of the upper fixed contact and the fixed contact insulation supporting disc (the bottom face of the mounting groove), a contact pressure spring with the lower end being in butt joint with the upper fixed contact is sleeved on the stud, and one end of the upper fixed contact is always pressed on the corresponding arc-shaped movable contact through the contact pressure spring. And the movable contact piece 21 on the A phase and the fixed contact on the A phase are reliably in conductive contact under the acting force of a contact pressure spring, the spring force is transmitted through the movable contact insulating turntable, and the movable contact piece 22 on the A phase and the fixed contact piece a1 12 on the A phase or the fixed contact piece a2 on the A phase are reliably in conductive contact.

In this embodiment, the structure that the other end of the upper static contact is filled up is for setting up in inlet wire seat one end and turning into the connecting portion of mounting groove, connecting portion is located between the other end bottom surface of the upper static contact and the bottom surface of mounting groove, and through the locking of screw fixed to make the space that forms between upper static contact one end and the bottom surface of mounting groove, so that contact pressure spring has the space of application of force pushing down.

The working principle of the rotary disc type change-over switch is as follows:

the A-phase lower static contact a1 is in conductive contact with the A-phase lower movable contact 22, and the A-phase lower movable contact 22 is in conductive connection with the A-phase upper movable contact 21 through a conductive rivet. The A-phase upper movable contact piece 21 and the A-phase upper fixed contact 14 keep in contact all the time, and at the moment, the A-phase lower fixed contact piece a1 of the change-over switch is conducted with the incoming line seat J (18) on the A-phase; the same B, C two phases are in the same state as a. When the switch needs to be switched, the movable contact insulating turntable rotates clockwise by a certain angle under the drive of the mechanism, the A-phase lower static contact a2 13 is in conductive contact with the A-phase lower dynamic contact 22, and at the moment, the A-phase lower static contact a2 13 is conducted with the wire inlet seat J (18) on the A-phase to finish one-time switching operation; the phase B and the phase C are the same as the phase A.

If the utility model discloses or relates to components or structures fixedly connected with each other, then unless otherwise stated, the fixed connection is understood as: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).

In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.

Any part provided by the utility model can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.

The foregoing description is only of the preferred embodiments of the utility model, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (8)

1. The utility model provides a compact low wearing and tearing high life carousel formula isolation switch structure, includes the fixed insulating supporting disk of static contact on the switch support, its characterized in that is provided with the cavity that is used for installing the insulating carousel of moving contact on the insulating supporting disk of static contact, the bottom surface of cavity is along the circumferencial direction interval distribution 6 down static contact, the upper and lower terminal surface of the insulating carousel of moving contact is along the circumference respectively 3 arc movable contact of equipartition, and the two arc movable contact conductive connection that upper and lower terminal surface corresponds, the even distribution of static contact up end is provided with 3 upper static contacts along circumference on the insulating supporting disk of static contact, the one end of upper static contact respectively with one be located the arc movable contact looks butt of the insulating carousel up end of moving contact.

2. The compact low-wear long-life rotary disc type isolation switch structure according to claim 1, wherein the lower static contact plates are uniformly embedded in the bottom surface of a concave cavity of the static contact insulation support disc, and an insulating material friction plate with a low friction coefficient is embedded between two lower static contact plates of the same phase, and the surface height of the insulating material friction plate is level with the surface of the lower static contact plates.

3. The compact low-wear long-life rotary disc type isolation switch structure according to claim 1 or 2, wherein the arc-shaped movable contact pieces are respectively embedded on the upper end face and the lower end face of the movable contact insulating rotary disc, and the two arc-shaped movable contact pieces corresponding to the upper end face and the lower end face are electrically connected through conductive rivets.

4. The compact, low wear, long life rotary disc type isolation switch structure of claim 1, wherein the length of the arcuate movable contact positioned on the upper surface of the movable contact insulating rotary disc is greater than the distance between two adjacent lower stationary contacts.

5. The compact rotary disc type isolation switch structure with low abrasion and long service life according to claim 1, 2 or 4, wherein the fixed contact insulation supporting disc is provided with mounting grooves which are radially led into the concave cavity along the circumferential direction at intervals, and the other end of the upper fixed contact is mounted in the mounting grooves.

6. The compact, low wear, long life rotary disc type isolation switch structure of claim 5, wherein the other ends of said upper stationary contacts are connected to a wire inlet seat, respectively.

7. The compact low-wear long-life rotary disc type isolation switch structure according to claim 1, 2, 4 or 6, wherein the fixed contact insulation supporting disc is further provided with a pressing mechanism which enables the upper fixed contact to be pressed on the arc-shaped movable contact piece on the upper end face of the movable contact insulation rotary disc and applies downward pressure to achieve conductive contact.

8. The compact, low wear, long life rotary disc type isolation switch structure of claim 7, wherein said hold down mechanism comprises a stud vertically passing through the upper stationary contact and screwed to the stationary contact insulating support disc, said stud being sleeved with a contact pressure spring having a lower end abutting the upper stationary contact.