CN116504555A

CN116504555A - Change-over switch

Info

Publication number: CN116504555A
Application number: CN202210060610.5A
Authority: CN
Inventors: 黄文体; 吕晴杰; 郭德鑫; 李俐
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2022-01-19
Filing date: 2022-01-19
Publication date: 2023-07-28

Abstract

The invention relates to the field of low-voltage appliances, in particular to a change-over switch, which comprises a shell and a contact system, wherein the shell comprises at least one contact cavity, the contact system is arranged in the contact cavity, the contact system comprises a moving contact assembly which is rotationally arranged, a first power contact, a second power contact and a load terminal, the first power contact, the second power contact and the load terminal are arranged around the moving contact assembly and distributed at three vertexes of a triangle, the moving contact assembly comprises a supporting unit and a moving contact which is arranged on the supporting unit, the moving contact is electrically connected with the load terminal, and two ends of the moving contact are respectively matched with the first power contact and the second power contact; the change-over switch also comprises an isolation shield arranged in the contact cavity, and the isolation shield is positioned between the first power contact and the second power contact; the change-over switch has good internal insulation and small specification volume.

Description

Change-over switch

Technical Field

The invention relates to the field of piezoelectric devices, in particular to a change-over switch.

Background

The existing three-section type (namely, a first power supply position, a second power supply position and a double-breaking potential position) automatic transfer switching device has the following problems:

1. the contact system adopts a two-layer double-cavity structure to set the contact system, namely, the first power supply contact system and the second power supply contact system are respectively positioned in two independent cavities, and the contact system has the problems of complex structure, large volume specification and the like although the safety is good; or the contact system adopts a single cavity to set the contact system, namely the contact systems of the first power supply and the second power supply are positioned in the same cavity and have double-division stay positions, and the contact system adopts a double-break contact system, so that electric arcs can be generated at the wire inlet end and the load side at the moment of breaking and switching on the load current, and the short circuit risk exists between the first power supply and the second power supply.

2. The first power contact and the second power contact lack an effective and reliable isolation structure, and the problem of arc-crossing easily occurs during switching operation.

3. The contact support is usually formed by assembling a plurality of support units which are arranged side by side and used for bearing the moving contact and the spring piece and square shafts which penetrate through the support units to realize synchronous rotation; because the supporting units are matched with the square shaft to form gaps, each supporting unit can shake more or less relative to the square shaft, and the synchronism of each phase of supporting unit is often poor in the switching-on and switching-off process, so that the test performance of a product is influenced; in addition, the external structure (e.g., a driving device or an operating mechanism) drives the contact from the contact support end by: the external structure drives the metal sheet, the metal sheet is transmitted to the square shaft, and then the square shaft drives each supporting unit to rotate forward or reversely; the first transmission path is long, the transmission efficiency is easy to lose, and the second transmission path also has adverse effect on the synchronism of each supporting unit.

4. The movable contact assembly is usually in a mode of arranging a movable gasket between two movable contact blades so as to ensure an initial gap between the two movable contact blades, and the centers of the two movable contact blades can move left and right along the axial direction of the mounting shaft; but has the following disadvantages: because the spring pieces on two sides of the movable contact knife cannot achieve the complete consistency of force values due to the size and the process reasons, the central positions of the two movable contact knives cannot be completely limited, when the pressure of the spring piece on one side is too large, the central positions of the two movable contact knives can deviate greatly, so that the deviation between the central positions of the movable contact knives and the stationary contact knives is too large, and the stationary contact knives cannot be inserted into and contacted, or the pressure of one movable contact knife and the stationary contact knife is too small, so that the movable contact knives are heated and damaged; in order to solve the above problems, if only the movable shim is changed to the fixed shim, although the center positions of the two movable contact blades will not be shifted when the pressure of the spring piece on one side is too large, when the stationary contact blade is inserted between the two movable contact blades, the pressure on one side of the stationary contact blade is large and the pressure on the other side is small, so that the stationary contact blade may not be easily inserted between the two movable contact blades, and an excessive temperature rise may occur between the two movable contact blades and the movable contact blade giving the smaller pressure.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a change-over switch which has good internal insulation and small specification volume.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the utility model provides a change-over switch, it includes casing and contact system, the casing includes at least one contact chamber, contact system is equipped with in the contact chamber, contact system includes the moving contact subassembly that rotates the setting and surrounds the moving contact subassembly and set up and distribute first power contact, second power contact and the load terminal in three summit of a triangle-shaped, the moving contact subassembly includes supporting unit and the moving contact that sets up on supporting unit, the moving contact keeps electrically to link with the load terminal and both ends cooperate with first power contact and second power contact respectively; the transfer switch also includes an isolation shield disposed within the contact cavity, the isolation shield being positioned between the first power contact and the second power contact.

Preferably, the isolation shroud includes a shroud spacer positioned between the first power contact and the second power contact for separating the first power contact from the second power contact; the support unit is of a cylindrical structure, and one end of the shield partition plate is in clearance fit with the circumferential side surface of the support unit.

Preferably, the shield partition plate comprises a horizontal partition plate and an arc partition plate which are connected in a bending manner, and the arc partition plate is in clearance fit with the circumferential side surface of the supporting unit.

Preferably, the isolation shield is in limit fit with the side wall of the contact cavity.

Preferably, the movable contact is electrically connected with the load terminal through a flexible conductor; or the movable contact and the load terminal are kept electrically connected through a sliding contact structure.

Preferably, the connection position of the movable contact and the flexible conductor is close to the rotation center of the movable contact assembly.

Preferably, the sliding contact structure comprises an inserting structure and a clamping piece structure, wherein the clamping piece structure comprises two groups of clamping pieces which are oppositely arranged at intervals, and the inserting structure is always inserted between the two clamping pieces and is in sliding contact with the clamping pieces; the plug-in structure and the clamping piece structure are arranged on the movable contact and synchronously rotate with the movable contact, and the other fixed structure is electrically connected with the load terminal.

Preferably, the moving contact assembly rotates to a first connection position in a first direction to be in contact conduction with the first power contact, and rotates to a second connection position in a second direction to be in contact conduction with the second power contact, wherein the first direction and the second direction are opposite to each other; the movable contact assembly is positioned at the double-break power-off position and is disconnected with the first power contact and the second power contact, one end of the movable contact is positioned between the first power contact and the load terminal, and the other end of the movable contact is positioned between the second power contact and the load terminal; when the movable contact assembly is switched between a first switch-on position and a second switch-on position, the angle through which the movable contact assembly rotates is alpha, and 60 degrees is less than alpha and less than 150 degrees.

Preferably, the shell comprises a plurality of contact cavities which are arranged side by side at intervals, a group of contact systems are arranged in each contact cavity, each movable contact assembly is coaxially arranged and synchronously rotates, and each contact cavity is internally provided with an isolation shield; the contact system also comprises a moving contact system, the moving contact system comprises a contact support, the contact support comprises a support unit of each moving contact assembly and a driven unit positioned at one end of the contact support, the driven unit comprises a connecting part and a driven part which are fixedly connected together, each support unit and each connecting part are arranged side by side and are of an integrated structure, and the driven part is driven by external force and drives each support unit to synchronously rotate through the connecting part.

Preferably, the support units, the connection parts and the linkage shaft parts are respectively connected through the linkage shaft parts, and the support units, the connection parts and the linkage shaft parts are of an integrated structure.

Preferably, the driven portion is a metal driven portion.

Preferably, the moving contact assembly further comprises a spring piece and a mounting shaft, the two moving contacts are oppositely arranged, the two spring pieces are respectively positioned at two sides of the two moving contacts and are respectively in elastic contact with the two moving contacts, the mounting shaft penetrates through the moving contacts and the spring pieces to be fixedly matched with the supporting unit, and the moving contacts are arranged to move along the axial direction of the mounting shaft; the movable contact assembly further comprises a movable gasket movably sleeved on the mounting shaft, wherein the movable gasket is positioned between the contact limiting side surfaces of the two movable contacts, and two ends of the movable gasket are respectively in limiting fit with the two movable contacts; the supporting unit comprises a supporting limiting piece fixedly arranged between the limiting sides of the moving contacts of the two moving contacts, and the thickness of the supporting limiting piece is smaller than that of the movable gasket.

Preferably, the supporting limiting piece is arranged around the movable gasket, the supporting limiting piece comprises a limiting piece avoiding groove, and the movable gasket is positioned in the limiting piece avoiding groove;

the movable contact assembly comprises two mounting shafts and two movable gaskets, the two mounting shafts are arranged side by side at intervals, and the two movable gaskets are respectively sleeved on the two mounting shafts; the supporting unit comprises two supporting limiting sheets which are respectively matched with the two movable gaskets.

Preferably, the support unit includes a support body and a support cover; the support body comprises a support mounting groove for mounting the moving contact and the spring piece, a support limiting piece is arranged on the bottom wall of the support mounting groove, a pair of side walls of the support mounting groove are mounting side walls, the moving contact and the spring piece are positioned between the two mounting side walls, and two ends of the mounting shaft are respectively inserted into the two mounting side walls; the support cover comprises two cover side plates which are oppositely arranged and a cover connecting plate used for connecting the two cover side plates, the two cover side plates are respectively positioned on two sides of the two mounting side walls and are in limit fit with the two mounting side walls, and the two cover side plates are also respectively in limit fit with two ends of the mounting shaft.

Preferably, the contact cavity is internally provided with a first arc-extinguishing chamber and a second arc-extinguishing chamber, the first arc-extinguishing chamber is positioned between the first power contact and the load terminal, the second arc-extinguishing chamber is positioned between the second power contact and the load terminal, and the first arc-extinguishing chamber and the second arc-extinguishing chamber are oppositely arranged on two radial sides of the moving contact assembly.

According to the change-over switch, the moving contact assembly, the first power contact, the second power contact and the load terminal are all arranged in the same contact cavity, so that the space is saved, and the specification volume of the change-over switch is reduced; the moving contact component of the contact system is electrically connected with the load terminal, so that when the current is switched on and off, an electric arc is not generated on the load side, and the occurrence of the condition of arc-serial short circuit between the first power contact and the second power contact is stopped or obviously reduced; the isolation shield is positioned between the first power contact and the second power contact, so that the insulation gap and the creepage distance between the first power contact and the second power contact are further improved; the two modes are matched with each other, so that the safety and the insulation performance of the change-over switch are improved as a whole.

In addition, the arc-shaped partition plate is beneficial to increasing the gap length between the arc-shaped partition plate and the circumferential side surface of the supporting unit, so that the insulation gap and the creepage distance between the first power contact and the second power contact are further improved.

In addition, the movable contact assembly realizes self-adaption of clamping force, ensures consistency of clamping force values of two movable contacts to a static contact knife, and avoids the problem that temperature rise is too high or instantaneous heavy current impact cannot be born due to insufficient clamping force of one movable contact.

In addition, the connection part of the supporting unit supported by the contact and the driven unit is of an integrated structure, so that the synchronization of the actions of the supporting units is guaranteed; and the connecting part and the driven part are detachably and fixedly connected, and the driven part can be made of materials different from the connecting part to improve the service life of the driven part, and can be replaced after the driven part is damaged, so that the service life of the whole contact support is prolonged.

Drawings

FIG. 1 is a schematic perspective view of a transfer switch of the present invention;

FIG. 2 is a schematic view of a projected structure of a transfer switch of the present invention, wherein a moving contact assembly of a contact system is located at a double-break power-off position;

FIG. 3 is a schematic view of a projected configuration of the transfer switch of the present invention with the movable contact assembly of the contact system in a first on position;

FIG. 4 is a schematic view of the projected structure of the transfer switch of the present invention with the movable contact assembly of the contact system in the second on position;

FIG. 5 is a schematic view of the structure of the isolation shield of the present invention;

FIG. 6 is a schematic view of the assembled structure of the isolation shield and base of the present invention;

FIG. 7 is a schematic view of the moving contact system of the present invention in one view;

FIG. 8 is a schematic view of the moving contact system of the present invention from another perspective;

FIG. 9 is a schematic exploded view of the passive unit of the present invention;

fig. 10 is a schematic view of an assembled structure of the moving contact assembly, flexible conductor and load terminal of the present invention;

FIG. 11 is a schematic view of the structure of the moving contact assembly of the present invention;

FIG. 12 is a schematic cross-sectional view of a moving contact assembly of the present invention;

FIG. 13 is a schematic view of an exploded view of the moving contact assembly of the present invention;

FIG. 14 is a schematic view of the structure of the support body of the present invention;

FIG. 15 is a schematic view of a projected structure of the moving contact assembly of the present invention;

FIG. 16 is a schematic view of the structure of the moving contact of the present invention;

FIG. 17 is a schematic view of the structure of the spring plate of the present invention.

Detailed Description

Embodiments of the transfer switch of the present invention are further described below with reference to the examples shown in fig. 1-17. The change-over switch of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-4, the transfer switch of the present invention comprises a housing and a contact system, wherein the housing comprises at least one contact cavity, the contact cavity is provided with the contact system, the contact system comprises a movable contact assembly 9 which is rotatably arranged, and a first power contact 1, a second power contact 2 and a load terminal 4 which are arranged around the movable contact assembly 9 and distributed at three vertexes of a triangle, the movable contact assembly 9 comprises a supporting unit 9-1 and a movable contact 3 which is arranged on the supporting unit 9-1, the movable contact 3 is electrically connected with the load terminal 4, and two ends of the movable contact are respectively matched with the first power contact 1 and the second power contact 2; the diverter switch further comprises an isolation shield 10 arranged in the contact cavity, the isolation shield 10 being located between the first power contact 1 and the second power contact 2.

According to the change-over switch, the moving contact assembly, the first power contact 1, the second power contact 2 and the load terminal 4 are all arranged in the same contact cavity, so that the space is saved, and the specification volume of the change-over switch is reduced; the moving contact component 9 of the contact system is electrically connected with the load terminal, so that when the current is switched on and off, an arc is not generated on the load side, and the occurrence of a series arc short circuit between the first power contact 1 and the second power contact 2 is avoided or obviously reduced; the isolation shield 10 is positioned between the first power contact 1 and the second power contact 2, so that the insulation gap and the creepage distance between the first power contact 1 and the second power contact 2 are further improved; the two modes are matched with each other, so that the safety and the insulation performance of the change-over switch are improved as a whole.

As shown in fig. 1-4 and 6-8, one embodiment of the transfer switch of the present invention is shown.

The change-over switch of the embodiment comprises a shell, a contact system and an isolation shield 10, wherein the shell comprises a plurality of contact cavities which are arranged side by side at intervals, and the contact system and the isolation shield 10 are arranged in each contact cavity; the contact system comprises a moving contact assembly 9 which is arranged in a rotating mode, a first power contact 1, a second power contact 2 and a load terminal 4 which are arranged around the moving contact assembly 9 and distributed at three peaks of a triangle, wherein the moving contact assembly 9 comprises a supporting unit 9-1 and a moving contact 3 which is arranged on the supporting unit 9-1, the moving contact 3 is electrically connected with the load terminal 4, two ends of the moving contact 3 are matched with the first power contact 1 and the second power contact 2 respectively, and an isolation shield 10 is arranged between the first power contact 1 and the second power contact 2.

As shown in fig. 3-4, the moving contact assembly 9 rotates to a first on position in a first direction to be in contact conduction with the first power contact 1, and the moving contact assembly 9 rotates to a second on position in a second direction to be in contact conduction with the second power contact 2, wherein the first direction and the second direction are opposite to each other; as shown in fig. 2, the moving contact assembly 9 is located at a double-breaking potential position and is disconnected from the first power contact 1 and the second power contact 2, one end of the moving contact 3 is located between the first power contact 1 and the load terminal 4, and the other end is located between the second power contact 2 and the load terminal 4.

Specifically, as shown in the directions of fig. 3-4, one end of the movable contact 3 swings between the first power contact 1 and the load terminal 4, and the other end swings between the second power contact 2 and the load terminal 4; the first direction is clockwise, and the second direction is counterclockwise.

As shown in fig. 3-4, the movable contact assembly 9 rotates through an angle alpha, 60 degrees < alpha < 150 degrees when the movable contact assembly 9 is switched between a first switch-on position and a second switch-on position. Further, 90 DEG < alpha < 150 deg. Further, α=120°. By the structural design, the opening distance can be effectively increased, and the occurrence of arc-connection short circuit between the first power contact 1 and the second power contact is avoided.

Preferably, the triangle is an isosceles triangle, and the first power contact 1 and the second power contact 2 are respectively positioned at the corresponding vertexes of two base angles of the isosceles triangle.

Preferably, as shown in fig. 2-4, the triangle is an equilateral triangle.

As shown in fig. 1-3, the center of rotation of the movable contact assembly 9 is located in the middle of the triangle.

As shown in fig. 1-4, the movable contact 3 is in contact conduction with the first power contact 1 or the second power contact 2 in a plug-in fit manner.

As shown in fig. 1-4, the first power contact 1 comprises a first static contact blade 1-1 and a first wiring board 1-0 which are connected in a bending way, and the first power contact 1 is fixed on a base 5 of the shell through the first wiring board 1-0; the second power contact 2 comprises a second static contact knife 2-1 and a second wiring board 2-0 which are connected in a bending way, and the second power contact 2 is fixed on an upper cover 7 of the shell through the second wiring board 2-1; when the movable contact assembly 9 is positioned at the first on position, the first static contact knife 1-1 is inserted between one ends of the two movable contacts 3 of the movable contact assembly 9; when the movable contact assembly 9 is located at the second on position, the second static contact knife 2-0 is inserted between the other ends of the two movable contacts 3 of the movable contact assembly 9.

As other embodiments, the moving contact 3 is contacted with the first power contact 1 or the second power contact 2 in a clapping manner.

The change-over switch of the present embodiment keeps the moving contact 3 of the moving contact assembly 9 electrically connected with the load terminal 4 by:

mode one: as shown in fig. 1-4, the moving contact 3 is held in electrical communication with the load terminal 4 by a flexible conductor 12. Further, the connection position of the moving contact 3 and the flexible conductor 12 is close to the rotation center of the moving contact assembly 9, so that when the moving contact assembly 9 rotates, the movement amplitude of the flexible conductor 8 is reduced, and the service life of the moving contact is prolonged.

As shown in fig. 2, the load terminal 4 includes a load terminal inner plate 4-0 and a load terminal outer plate 4-1 which are connected by bending, the load terminal 4 is fixed on the base 5 of the housing through the load terminal outer plate 4-1, and the load terminal inner plate 4-0 is electrically connected with the moving contact 3 through the flexible conductor 12.

Mode two: the movable contact 3 is electrically connected with the load terminal 4 through a sliding contact structure.

Preferably, the sliding contact structure comprises an inserting structure and a clamping piece structure, wherein the clamping piece structure comprises two groups of clamping pieces which are oppositely arranged at intervals, and the inserting structure is always inserted between the two groups of clamping pieces and is in sliding contact with the clamping pieces; the plug-in structure and the clamping piece structure are arranged on the movable contact 3 to rotate synchronously with the movable contact, and the other fixed structure is electrically connected with the load terminal 4.

As shown in fig. 1 to 4, the change-over switch of the present embodiment is preferably in mode one.

As shown in fig. 1-4, the isolation shield 10 includes a shield spacer positioned between the first power contact 1 and the second power contact 2 for separating the first power contact 1 and the second power contact 2; the supporting unit 9-1 of the movable contact assembly 9 is of a cylindrical structure, and one end of the shield partition plate is in clearance fit with the circumferential side surface of the supporting unit 9-1.

The "clearance fit" refers to: one end of the shield partition is disposed adjacent to the circumferential side of the supporting unit 9-1 with a necessary gap therebetween so as not to affect the rotation of the supporting unit 9-1.

As shown in fig. 1-4, the shield partition board comprises a horizontal partition board 10-0 and a circular arc partition board 10-1 which are connected in a bending manner, the circular arc partition board 10-0 is in clearance fit with the circumferential side surface of the supporting unit 9-1, and the circular arc partition board 10-1 is beneficial to increasing the clearance length between the circular arc partition board and the circumferential side surface of the supporting unit 9-1, so that the insulation clearance and the creepage distance between the first power contact 1 and the second power contact 2 are further improved.

Specifically, as shown in fig. 1-4, the second power contact 2 and the first power contact 1 are respectively disposed on the upper side and the lower side of the shield partition, the horizontal partition 10-0 horizontally extends between the first power contact 1 and the second power contact 2, and the circular arc partition 10-1 is bent and connected with the right end of the horizontal partition 10-0 and is in clearance fit with the circumferential side surface of the support unit 9-1.

As shown in fig. 6, the isolation shield 10 is in positive engagement with the side walls of the contact cavity.

Specifically, as shown in fig. 5, the isolation shroud 10 further includes two opposite installation side plates 10-2 and two limit ribs 10-3 disposed on the two installation side plates 10-2, and one end of the installation side plate 10-2 is connected with the shroud partition plate in a bending manner; as shown in fig. 6, a pair of side walls of the contact cavity are respectively provided with a shell limit groove 5-1, and a limit rib 10-3 is inserted into the shell limit groove 5-1. Further, as shown in fig. 1-4 and 6, the housing includes a base 5 and an upper cover 7 that are relatively buckled together, and the first power contact 1 and the second power contact 2 are respectively arranged on the base 5 and the upper cover 7; the contact cavity comprises a base half cavity 5-0 and an upper cover half cavity which are respectively arranged on the base 5, the base half cavity and the upper cover half cavity are spliced to form the contact cavity, a pair of side walls of the base half cavity 5-0 are respectively provided with a shell limiting groove 5-1, the isolation shield 10 is inserted into the base half cavity 5-0, and the direction of inserting the isolation shield 10 into the base half cavity 5-0 is the same as the buckling direction of the upper cover 7 and the base 5. Further, as shown in fig. 1-4, the shield partition is located at the junction of the base 5 and the upper cover 7.

Specifically, as shown in fig. 1-4 and 6, the upper cover 7 and the base 5 are fastened together up and down, and the isolation shield 10 is inserted into the base half cavity 5-0 from top to bottom.

As shown in fig. 1-5, the isolation shield 10 further includes a connection side plate 10-4, the connection side plate 10-4 is located between the two installation side plates 10-2 and is connected to the two installation side plates 10-2 respectively, one end of the connection side plate 10-4 is connected to the shield partition, and the other end is propped against the first power contact 1. Further, one end of the connecting side plate 10-4 is connected with the horizontal partition plate 10-0 of the shield partition plate, the other end of the connecting side plate abuts against the first wiring board 1-1 of the first power contact 1, and the isolation shield 10 covers the first power contact 1.

As shown in fig. 1-5, the isolation shield 10 further includes a reinforcing plate 10-5, the reinforcing plate 10-5 is disposed between the two mounting side plates 10-2 and connected to the two mounting side plates 10-2, the reinforcing plate 10-5 is disposed side by side with the connecting side plate 10-4 at a distance from the connecting side plate 10-4 and between the connecting side plate 10-4 and the moving contact assembly, and one end of the reinforcing plate 10-5 is connected to the shield partition. Further, one end of the reinforcing plate 10-5 is connected with the horizontal partition plate 10-5 of the shield partition plate. The reinforcement plate 10-5 is advantageous in improving the structural strength of the insulation shield 10.

As shown in fig. 1-4, the isolation shroud 10 and the load terminal 4 are disposed on opposite radial sides of the moving contact assembly 9.

As shown in fig. 1-4, in the transfer switch of the present invention, a first arc-extinguishing chamber 11-1 and a second arc-extinguishing chamber 11-2 are disposed in each contact cavity of a housing, the first arc-extinguishing chamber 11-1 is located between a first power contact 1 and a load terminal 4, the second arc-extinguishing chamber 11-2 is located between a second power contact 2 and the load terminal 4, and the first arc-extinguishing chamber 11-1 and the second arc-extinguishing chamber 11-2 are disposed on two radial sides of a moving contact assembly 9. Further, the isolation shield 10, the second power contact 2, the second arc extinguishing chamber 11-2, the load terminal 4, the first power contact 1 and the first arc extinguishing chamber 11-1 are sequentially arranged around the movable contact assembly 9.

As shown in fig. 10-17, is an embodiment of the moving contact assembly 9.

The movable contact assembly 9 comprises a supporting unit 9-1, a movable contact 3 arranged on the supporting unit 9-1, a spring piece 13 and a mounting shaft 17, wherein the two movable contacts 3 are oppositely arranged, the two spring pieces 13 are respectively positioned at two sides of the two movable contacts 3 and are respectively in elastic contact with the two movable contacts 3, the mounting shaft 17 penetrates through the movable contacts 3 and the spring pieces 13 to be fixedly matched with the supporting unit 9-1, and the movable contacts 3 are arranged to move along the axial direction of the mounting shaft 17; the movable contact assembly 9 further comprises a movable gasket 16 movably sleeved on the mounting shaft 17, wherein the movable gasket 16 is positioned between the contact limiting sides of the two movable contacts 3, and two ends of the movable gasket are respectively in limiting fit with the two movable contacts 3; the supporting unit 9-1 comprises a supporting limiting piece 9-1-0-1 fixedly arranged between the limiting sides of the moving contacts of the two moving contacts 3, and the thickness of the supporting limiting piece 9-1-0-1 is smaller than that of the movable gasket 16.

As shown in fig. 15, in the moving contact assembly of the embodiment, two moving contacts 3 are symmetrically distributed on two sides of a supporting and limiting piece 9-1-0-1, a gap exists between each moving contact 3 and the supporting and limiting piece 9-1-0-1, and two ends of a movable gasket 16 are respectively in limiting fit with the limiting sides of the contacts of the two moving contacts 3; alternatively, as shown in connection with fig. 15, the gap width between the two movable contacts 3 and the supporting and limiting piece 9-1-0-1 is different; in the above two cases, the pressures of the two spring pieces 13 on the two moving contacts 3 are equal and opposite. When the pressures of the two spring pieces 13 on the two moving contacts 3 are different, the spring piece 13 with larger pressure drives the moving contact 3 to move along the mounting shaft 17 to the side where the spring piece 13 with smaller pressure is located, and one of the moving contacts 3 is in abutting limit with the supporting limit piece 9-1-0-1, so that the displacement of the moving contact 3 is controllable, namely the moving contact 3 is ensured to have movable activity, and meanwhile, the limit position of the moving contact 3 is limited, thereby avoiding or obviously reducing the possibility that a static contact knife is difficult to be inserted between the two moving contacts 3 due to the offset of the moving contact 3, and playing a role in balancing the pressure of the two moving contacts 3 on the static contact knife.

Based on the reasons, the movable contact assembly realizes self-adaption of clamping force, ensures consistency of clamping force values of the two movable contacts 3 to the static contact knife, and avoids the problem that temperature rise is too high or instantaneous heavy current impact cannot be born due to insufficient clamping force of the movable contact 3 on one side.

It should be noted that the contact limiting side of the moving contact 3 may be an integral side or may be a plurality of coplanar sides. As shown in fig. 10-12 and 15-16, the contact limiting side of the moving contact 3 of the moving contact assembly of this embodiment is preferably an integral side, which is respectively matched with the movable gasket 16 and the supporting limiting piece 9-1-0-1.

Preferably, the thickness difference between the supporting and limiting piece 9-1-0-1 and the movable gasket 16 is 0.5mm. It should be noted that the specific value of the thickness difference between the supporting limiting piece 9-1-0-1 and the movable gasket 16 is determined by the model and specification of the product; if the thickness difference is too small, the movable range of the center position of the movable contact is insufficient; if the thickness difference is too large, the moving range of the center position of the moving contact is too large, so that the static contact knife cannot be inserted between the moving contacts or is difficult to insert between the moving contacts, and the self-adaptive effect of the clamping force is also deteriorated.

As shown in fig. 11-12 and 14-15, the supporting and limiting piece 9-1-0-1 is arranged around the movable gasket 16, the supporting and limiting piece 9-1-0-1 comprises a limiting piece avoiding groove 9-1-0-10, and the movable gasket 16 is positioned in the limiting piece avoiding groove 9-1-0-10.

Specifically, as shown in fig. 11-13 and 15, the movable contact assembly 9 includes two mounting shafts 17 and two movable gaskets 16, the two mounting shafts 17 are arranged side by side at intervals, and the two movable gaskets 16 are respectively sleeved on the two mounting shafts 17; the supporting unit 9-1 comprises two supporting limiting sheets 9-1-0-1 which are respectively matched with the two movable gaskets 16 correspondingly.

As shown in fig. 14, the supporting unit 9-1 includes a supporting and mounting groove for mounting the movable contact 3 and the spring piece 13, the supporting and limiting piece 9-1-0-1 is disposed on the bottom wall of the supporting and mounting groove, and the distance between the supporting and limiting piece 9-1-0-1 and the two side walls of the supporting and mounting groove is equal.

As shown in fig. 12, 14 and 17, the supporting unit 9-1 further includes a supporting limit slot 9-1-0-4, the spring piece 13 includes a spring piece protrusion 13-3, and the spring piece protrusion 13-3 is in plug-in fit with the supporting limit slot 9-1-0-4; the inserting direction of the spring piece bulge 13-3 and the supporting limit groove 9-1-0-4 is perpendicular to the axial direction of the mounting shaft 17; the spring piece bulge 13-3 is matched with the supporting limit groove 9-1-0-4, rollover of the spring piece 13 can be effectively reduced, and the spring piece 13 is ensured to be horizontally pressed on the movable contact 3. Further, the spring piece protrusion 13-3 is connected with the spring piece middle section 13-0 of the spring piece 13 and is coplanar with the spring piece middle section 13-0.

As shown in fig. 12 and 16, the moving contact 3 is in an arcuate flat plate structure, and includes a moving contact middle section 3-0 and a moving contact section 3-1, the two moving contact sections 3-1 are respectively connected with the moving contact middle section 3-0 in a bending manner, one sides of free ends of the two moving contact sections 3-1 are respectively provided with a moving contact, the free ends of the two moving contact sections 3-1 are respectively protruded outside the supporting unit 9-1, and the moving contact 3 is further provided with a contact hole for a mounting shaft 17 to pass through. Further, the two contact holes are respectively arranged on the two moving contact sections 3-1 and symmetrically arranged on two sides of the moving contact middle section 3-0.

As shown in fig. 17, the spring piece 13 is of an arch structure, and includes a spring piece middle section 13-0 and a spring piece matching section 13-1, where the two spring piece matching sections 13-1 are respectively connected with two ends of the spring piece middle section 13-0 in a bending manner; the spring piece matching section 13-1 comprises a first matching section 13-10 and a second matching section 13-11 which are connected in a bending manner, two ends of the first matching section 13-10 are respectively connected with the spring piece middle section 13-0 and the second matching section 13-11, the first matching section 13-10 and the spring piece middle section 13-0 are coplanar, the second matching section 13-11 is bent towards the side of the moving contact 3, and free ends of the two second matching sections 13-11 are in elastic contact with two ends of the moving contact 3.

As shown in fig. 10-14, the supporting unit 9-1 includes a supporting body 9-1-0 and a supporting cover 9-1-1; the supporting body 9-1-0 comprises a supporting installation groove for installing the movable contact 3 and the spring piece 13, a supporting limit piece 9-1-0-1 is arranged on the bottom wall of the supporting installation groove, a pair of side walls of the supporting installation groove are installation side walls 9-1-0-0, the movable contact 3 and the spring piece 13 are positioned between the two installation side walls 9-1-0-0, and two ends of the installation shaft 17 are respectively inserted into the two installation side walls 9-1-0-0; the supporting cover 9-1-1 comprises two cover side plates 9-1-1-0 which are oppositely arranged and are used for connecting the cover connecting plates 1-1-3 of the two cover side plates 9-1-1-0, the two cover side plates 9-1-1-0 are respectively positioned at two sides of the two mounting side walls 9-1-0-0 and are in limit fit with the two mounting side walls 9-1-0-0, and the two cover side plates 9-1-1-0 are respectively in limit fit with two ends of the mounting shaft 17.

As shown in fig. 12-14, the mounting side wall 9-1-0-0 of the supporting body 9-1-0 is provided with a body clamping hole 9-1-0-2, and the cover side plate 9-1-1-0 of the supporting cover 9-1-1 is provided with a cover clamping table 9-1-1-2 in snap fit with the body clamping hole 9-1-0-2.

As shown in fig. 14, the mounting side wall 9-1-0-0 further includes an insertion groove 9-1-0-6 into which the cover side plate 9-1-1-0 is inserted, so that the outer side surface of the cover side plate 9-1-1-0 is flush with the outer side surface of the mounting side wall 9-1-0-0, thereby reducing the overall size and volume of the supporting unit 9-1 and enhancing the aesthetic appearance.

As shown in fig. 7-8, 10-11 and 15, the supporting cover 9-1-1 includes a cover avoiding hole 9-1-1 through which the flexible connection assembly passes, and two sides of the cover avoiding hole 9-1-1-1 are respectively provided with a cover connecting plate 9-1-1-3.

As shown in fig. 1-4 and 7-8, the transfer switch of the invention further comprises a moving contact system, the moving contact system comprises a contact support, the contact support comprises a support unit 9-1 of each moving contact assembly 9 and a driven unit 8 positioned at one end of the contact support, the driven unit 8 comprises a connecting part 8-0 and a driven part 8-1 which are fixedly connected together, each support unit 9-1 and each connecting part 8-0 are arranged side by side and are of an integral structure, and the driven part 8-1 is driven by external force and drives each support unit 9-1 to synchronously rotate through the connecting part 8-0. The supporting units 9-1 supported by the contacts and the connecting parts 8-0 of the driven units 8 are of an integrated structure, so that the synchronization of the actions of the supporting units 9-1 is guaranteed; moreover, the connection part 8-0 and the driven part 8-1 are detachably and fixedly connected, and the driven part 8-1 can be made of materials different from the connection part 8-0 to improve the service life of the driven part 8-1, and can be replaced after the driven part 8-1 is damaged, so that the service life of the whole contact support can be prolonged.

As shown in fig. 7-9, the connecting portion 8-0 and the driven portion 8-1 are detachably and fixedly connected together; alternatively, the connecting portion 8-0 and the driven portion 8-1 are fixed together by injection molding. Further, the connecting portion 8-0 and the driven portion 8-0 are fixedly connected together by screws.

Preferably, as shown in fig. 7-9, the driven part 8-1 is a metal driven part and is made of a metal material. Of course, the driven part 8-1 can be made of other materials with good hardness and toughness, wear resistance and impact resistance.

As shown in fig. 8, the supporting units 9-1, the connecting portions 8-0 and the supporting units 9-1 are connected to each other by the shaft portion 9j, and the supporting units 9-1, the connecting portions 8-0 and the shaft portion 9j are integrally formed. Further, the supporting unit 9-1, the connecting portion 8-0 and the linkage shaft portion 9j are integrally injection-molded.

As other embodiments, the linkage shaft 9j may be a metal square shaft, and each support unit 9-1, the connecting portion 8-0 and the linkage shaft 9j are fixedly connected together by injection molding, and the metal square shaft is placed in a corresponding injection mold and then injection molded; the rotational axes of the respective supporting units 9-1, the connecting portion 8-0 and the interlocking shaft portion 9j coincide.

As shown in fig. 9, an embodiment of the passive unit 8 is shown.

As shown in fig. 9, the passive part 8-1 is preferably a flat plate-shaped structure.

As shown in fig. 9, the driven portion 8-1 includes a first arc-shaped hole 8-1-1 and a second arc-shaped hole 8-1-2 provided thereon, and an external structure (e.g., a driving device or an operating mechanism, both of which may be implemented by the prior art) drives the driven portion 8-1 to rotate in a first direction or a second direction through the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2, the first direction and the second direction being opposite to each other. Further, the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-2-2 are mirror images of each other.

Specifically, the external structure includes a first driving shaft and a second driving shaft respectively inserted in the first arc hole 8-1-1 and the second arc hole 8-1-2, the first driving shaft and the second driving shaft respectively move along the extending direction of the first arc hole 8-1-1 and the second arc hole 8-1-2 and drive the driven part 8-1 to rotate by striking the end parts of the first arc hole 8-1-1 and the second arc hole 8-1-2, the above process can be realized by the prior art, and the above process is not described in detail herein, and can refer to the matching process of the second instrument part and the first instrument part with the turntable device in the chinese patent CN 209544196U.

As shown in fig. 9, the driven portion 8-1 further includes a first positioning groove 8-1-4, the first positioning groove 8-1-4 is disposed on an edge of one end of the driven portion 8-1 and located between the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2, the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2 are disposed at the other end of the driven portion 8-1, and the external structure is in limit fit with the first positioning groove 8-1-4 to limit the contact support in the double-split position; as shown in fig. 2, when the contact support is located at the double-split position, the moving contact 3 carried by the contact support simultaneously opens the first power supply (typically a common power supply) and the second power supply (typically a standby power supply) of the automatic transfer switch, that is, the moving contact 3 simultaneously opens the first power contact 1 and the second power contact 2. Further, the first positioning groove 8-1-4 is a V-shaped groove.

Specifically, as shown in fig. 9, the first positioning groove 8-1-4 is disposed at the edge of the upper end of the driven portion 8-1, the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2 are disposed at the lower end of the driven portion 8-1, the first positioning groove 8-1-4, the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2 are spatially located at three vertices of a triangle, and the first positioning groove 8-1-4 is further located between the first arc-shaped hole 8-1-1 and the second arc-shaped hole 8-1-2.

As shown in fig. 9, the connection portion 8-0 and the driven portion 8-1 are arranged in a stacked manner, and the supporting unit 9-1 and the driven portion 8-1 are respectively located at both sides of the connection portion 8-0; the connection portion 8-0 includes a third arc hole 8-0-1 and a fourth arc hole 8-0-2, which are respectively in corresponding communication with the first arc hole 8-1-1 and the second arc hole 8-1-2, and a second positioning groove 8-0-4, which is respectively in corresponding communication with the first positioning groove 8-1-4.

As shown in fig. 9, the driven portion 8-1 includes a first main body portion 8-1-30 and a first protruding portion 8-1-31 provided at one end of the first main body portion 8-1-30; the connecting portion 8-0 includes a second body portion 8-0-30 and a second protrusion portion 8-0-31 provided at one end of the second body portion 8-0-30; the second main body part 8-0-30 is provided with an embedded groove on one side facing the driven part 8-1, the second main body part 8-0-30 is provided with a second main body part opening, the first main body part 8-1-30 is embedded into the embedded groove, and the first protruding part 8-1-31 passes through the second main body part opening and is arranged side by side with the second protruding part 8-0-31. Further, the driven part 8-1 further comprises a first groove 8-1-5, and the first groove 8-1-5 is arranged at the edge of the driven part 8-1 and is respectively positioned at two ends of the driven part 8-1 with the first positioning groove 8-1-4; the connecting portion 8-0 includes a first protrusion 8-0-5, and the first protrusion 8-0-5 is engaged with the first recess 8-1-5 and is located at both ends of the connecting portion 8-0 with the second positioning groove 8-0-4, respectively.

Specifically, as shown in fig. 9, the lower end of the second main body 8-0-30 is provided with a first protrusion 8-0-5, the upper end is provided with a second main body opening, and the second protrusion 8-0-4 is arranged at the upper end of the second main body 8-0-30; the first protrusion 8-1-4 is provided at an upper end of the first body 8-1-30, and the first recess 8-1-5 is provided on a lower end edge of the first body 8-1-30.

As shown in fig. 7-9, the connection portion 8-0 further includes a polygonal positioning stage 8-0-0 coaxially disposed with the contact support, and the passive portion 8-1 includes a polygonal positioning hole 8-1-0 mated with the polygonal positioning stage 8-0-0. Further, the polygonal positioning table 8-0-0 is arranged in the middle of one side of the second main body part 8-0-30 facing the driven part 8-1; the polygonal positioning holes 8-1-0 are arranged in the middle of the first main body part 8-1-30. The polygonal positioning table 8-0-0 and the polygonal positioning hole 8-1-0 are advantageous in improving the reliability of the connection portion 8-0 and the driven portion 8-1 and the synchronization of the actions.

The foregoing is a further detailed description of the invention in connection with the preferred embodiments, and it is not intended that the invention be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the invention, and these should be considered to be within the scope of the invention.

Claims

1. The transfer switch is characterized by comprising a shell and a contact system, wherein the shell comprises at least one contact cavity, the contact system is arranged in the contact cavity, the contact system comprises a moving contact assembly (9) which is arranged in a rotating mode, a first power contact (1), a second power contact (2) and a load terminal (4) which are arranged around the moving contact assembly (9) and distributed at three vertexes of a triangle, the moving contact assembly (9) comprises a supporting unit (9-1) and a moving contact (3) which is arranged on the supporting unit (9-1), the moving contact (3) is electrically connected with the load terminal (4), and two ends of the moving contact are matched with the first power contact (1) and the second power contact (2) respectively; the change-over switch further comprises an isolation shield (10) arranged in the contact cavity, and the isolation shield (10) is positioned between the first power contact (1) and the second power contact (2).

2. The transfer switch of claim 1, wherein: the isolation shield (10) comprises a shield partition plate which is positioned between the first power contact (1) and the second power contact (2) and is used for separating the first power contact (1) and the second power contact (2); the supporting unit (9-1) is of a cylindrical structure, and one end of the shield partition plate is in clearance fit with the circumferential side surface of the supporting unit (9-1).

3. The transfer switch of claim 2, wherein: the shield partition plate comprises a horizontal partition plate (10-0) and an arc partition plate (10-1) which are connected in a bending mode, and the arc partition plate (10-1) is in clearance fit with the circumferential side face of the supporting unit (9-1).

4. The transfer switch of claim 1, wherein: the isolation shield (10) is in limit fit with the side wall of the contact cavity.

5. The transfer switch of claim 1, wherein: the movable contact (3) is electrically connected with the load terminal (4) through a flexible conductor (12); or the movable contact (3) and the load terminal (4) are kept electrically connected through a sliding contact structure.

6. The transfer switch of claim 5, wherein: the connection position of the movable contact (3) and the flexible conductor (12) is close to the rotation center of the movable contact assembly (9).

7. The transfer switch of claim 5, wherein: the sliding contact structure comprises an inserting structure and a clamping piece structure, the clamping piece structure comprises two groups of clamping pieces which are oppositely arranged at intervals, and the inserting structure is always inserted between the two clamping pieces and is in sliding contact with the clamping pieces; the plug-in structure and the clamping piece structure are arranged on the movable contact (3) to rotate synchronously with the movable contact, and the other fixed structure is electrically connected with the load terminal (4).

8. The transfer switch of claim 1, wherein: the movable contact assembly (9) rotates to a first connection position in a first direction to be in contact conduction with the first power contact (1), the movable contact assembly (9) rotates to a second connection position in a second direction to be in contact conduction with the second power contact (2), and the first direction and the second direction are opposite to each other; the movable contact assembly (9) is positioned at a double-break power-off position and is disconnected with the first power contact (1) and the second power contact (2), one end of the movable contact (3) is positioned between the first power contact (1) and the load terminal (4), and the other end of the movable contact is positioned between the second power contact (2) and the load terminal (4); when the movable contact assembly (9) is switched between a first switch-on position and a second switch-on position, the angle rotated by the movable contact assembly (9) is alpha, and 60 degrees is less than alpha and less than 150 degrees.

9. The transfer switch of claim 1, wherein: the shell comprises a plurality of contact cavities which are arranged side by side at intervals, a group of contact systems are arranged in each contact cavity, each movable contact assembly is coaxially arranged and synchronously rotates, and each contact cavity is internally provided with an isolation shield (10); the contact system further comprises a moving contact system, the moving contact system comprises a contact support, the contact support comprises a support unit (9-1) of each moving contact assembly (9) and a driven unit (8) located at one end of the contact support, the driven unit (8) comprises a connecting part (8-0) and a driven part (8-1) which are fixedly connected together, each support unit (9-1) and each connecting part (8-0) are arranged side by side and are of an integrated structure, and the driven part (8-1) is driven by external force and drives each support unit (9-1) to synchronously rotate through the connecting part (8-0).

10. The transfer switch of claim 9, wherein: the supporting units (9-1), the connecting parts (8-0) and the linkage shaft parts (9 j) are respectively connected through the linkage shaft parts (9 j), and the supporting units (9-1), the connecting parts (8-0) and the linkage shaft parts (9 j) are of an integrated structure;

the driven part (8-1) is a metal driven part;

the movable contact assembly (9) further comprises a spring piece (13) and a mounting shaft (17), the two movable contacts (3) are oppositely arranged, the two spring pieces (13) are respectively positioned at two sides of the two movable contacts (3) and are respectively in elastic contact with the two movable contacts (3), the mounting shaft (17) penetrates through the movable contacts (3) and the spring pieces (13) to be fixedly matched with the supporting unit (9-1), and the movable contacts (3) are arranged to move along the axial direction of the mounting shaft (17); the movable contact assembly (9) further comprises a movable gasket (16) movably sleeved on the mounting shaft (17), the movable gasket (16) is positioned between the contact limiting sides of the two movable contacts (3) and two ends of the movable gasket are respectively in limiting fit with the two movable contacts (3); the supporting unit (9-1) comprises a supporting limiting piece (9-1-0-1) fixedly arranged between the limiting sides of the moving contacts of the two moving contacts (3), and the thickness of the supporting limiting piece (9-1-0-1) is smaller than that of the movable gasket (16);

the supporting limiting piece (9-1-0-1) is arranged around the movable gasket (16), the supporting limiting piece (9-1-0-1) comprises a limiting piece avoiding groove (9-1-0-10), and the movable gasket (16) is positioned in the limiting piece avoiding groove (9-1-0-10);

the movable contact assembly (9) comprises two mounting shafts (17) and two movable gaskets (16), the two mounting shafts (17) are arranged side by side at intervals, and the two movable gaskets (16) are respectively sleeved on the two mounting shafts (17); the supporting unit (9-1) comprises two supporting limiting sheets (9-1-0-1) which are respectively matched with the two movable gaskets (6) correspondingly;

the support unit (9-1) includes a support body (9-1-0) and a support cover (9-1-1); the support body (9-1-0) comprises a support mounting groove for mounting the movable contact (3) and the spring piece (13), a support limiting piece (9-1-0-1) is arranged on the bottom wall of the support mounting groove, a pair of side walls of the support mounting groove are mounting side walls (9-1-0-0), the movable contact (3) and the spring piece (13) are positioned between the two mounting side walls (9-1-0-0), and two ends of the mounting shaft (17) are respectively inserted into the two mounting side walls (9-1-0-0); the support cover (9-1-1) comprises two cover side plates (9-1-1-0) which are oppositely arranged, and cover connecting plates (9-1-1-3) which are used for connecting the two cover side plates (9-1-1-0), wherein the two cover side plates (9-1-1-0) are respectively positioned at two sides of the two mounting side walls (9-1-0-0) and are in limit fit with the two mounting side walls (9-1-0-0), and the two cover side plates (9-1-1-0) are also respectively in limit fit with two ends of the mounting shaft (17);

the contact cavity is internally provided with a first arc-extinguishing chamber (11-1) and a second arc-extinguishing chamber (11-2), the first arc-extinguishing chamber (11-1) is positioned between the first power contact (1) and the load terminal (4), the second arc-extinguishing chamber (11-2) is positioned between the second power contact (2) and the load terminal (4), and the first arc-extinguishing chamber (11-1) and the second arc-extinguishing chamber (11-2) are oppositely arranged on two radial sides of the moving contact assembly (9).