CN109950071B

CN109950071B - Integrated star-delta starting switch structure

Info

Publication number: CN109950071B
Application number: CN201910326217.4A
Authority: CN
Inventors: 冯科让; 曾玉娥; 黄正乾
Original assignee: Shenzhen Taiyong Electric Co ltd
Current assignee: Shenzhen Taiyong Electric Co ltd
Priority date: 2019-04-23
Filing date: 2019-04-23
Publication date: 2020-03-24
Anticipated expiration: 2039-04-23
Also published as: CN109950071A

Abstract

The invention discloses an integrated star-delta starting switch structure which comprises a switch body with a control circuit, wherein the switch body comprises a main switch, a change-over switch and a time delay device, the input end of the main switch is electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power supply inlet wire, the output end of the main switch is connected with the input end of the change-over switch, and the output circuit of the change-over switch is electrically connected with an external motor M; the output circuit of the change-over switch comprises a plurality of star-delta change-over switches, the motor M is started through the main switch, the star-delta change-over switches control the motor M to start in a star-delta mode, and the motor M is switched to a triangle connection mode after being delayed by the delay device, so that the normal operation of the motor M is realized. The switch structure of the invention can achieve the purpose of voltage reduction starting, can greatly reduce switching impact current, and has the characteristics of compact structure, scientific and reasonable layout of all functional elements, more convenient operation, safety, reliability and the like.

Description

Integrated star-delta starting switch structure

Technical Field

The invention relates to the technical field of star-delta starting of three-phase alternating-current motors, in particular to an integrated star-delta starting switch structure.

Background

With the development of society, the use of electric motors is becoming more and more common in different fields, and the types of electric motors are also becoming more and more, and the main component of an electric motor is that electric energy is controlled by a circuit system to drive a mechanical system to work, and the circuit system and the mechanical system are usually designed according to needs to meet the requirements. The three-phase alternating current motor has the advantages of simple structure, low price, high reliability and the like, and is widely applied, but the starting current is large in the starting process, so that the motor with large capacity needs to be started in a certain mode. The star-delta starting is a simple and convenient voltage reduction starting mode, so that the star-delta starting circuit is very wide in application. The three-phase alternating current motor comprises a star connection and a delta connection, the starting current of the star connection is smaller than that of the delta connection, so that the impact on a power grid is small during starting, and the torque of the delta connection is larger than that of the star connection. Therefore, the star-delta starting combining the two is an advantageous starting mode of the three-phase motor, namely, star connection is adopted in a starting stage to reduce impact on a power grid, and delta connection is adopted in an operation stage after the starting stage to generate large torque. However, in the conventional star-delta starting, a large impact current exists in the switching process from star starting to delta running, so that the tripping phenomenon of the circuit breaker is easily caused, and the starting failure phenomenon is caused. Particularly, the impact phenomenon is more obvious in the conventional star-delta starting of a high-power low-voltage motor.

Disclosure of Invention

The invention aims to solve the technical problem in the background technology, and provides a star-delta starting switch which can greatly reduce switching impact current and has compact structure, safety and reliability, in particular to an integrated star-delta starting switch structure.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the integrated star-delta starting switch structure comprises a switch body with a control circuit, wherein the switch body comprises a main switch, a change-over switch and a time delay device, the input end of the main switch is electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power supply inlet wire, the output end of the main switch is connected with the input end of the change-over switch, and the output circuit of the change-over switch is electrically connected with an external motor M; the output circuit of the change-over switch comprises a plurality of star-delta change-over switches, the motor M is started through the main switch, the star-delta change-over switches control the motor M to start in a star-delta mode, and the motor M is switched to a triangle connection mode after being delayed by the delay device, so that the normal operation of the motor M is realized.

Further, the switch structure of the invention, wherein the main switch includes a first bus, a first moving contact assembly and a first arc-extinguishing chamber, the first bus includes three conductors, which are respectively a conductor a, a conductor B and a conductor C, the conductor a, the conductor B and the conductor C in the first bus are sequentially arranged on the upper part of the switch body in parallel; the front end of the first bus is respectively provided with an input wiring terminal, the rear end of the first bus is respectively provided with a first static contact, and the input wiring terminal can be respectively and electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power supply inlet wire to be used as a three-phase power supply inlet wire interface of the switch body; the first moving contact component corresponds to the first bus, the first moving contact component is sequentially arranged beside the first fixed contact in parallel, the first moving contact component comprises a first moving contact, a second moving contact and a first flexible connection, corresponding first arc extinguish chambers are arranged on the outer sides of the first fixed contact and the first moving contact, and three main switches are respectively formed between the first moving contact and the first fixed contact;

the transfer switch comprises a second bus, a second movable contact assembly, a lower discharge bus, a third bus, an upper discharge bus, a first conductor, a first connecting bus, a second conductor, a second connecting bus, a second arc extinguish chamber and a third arc extinguish chamber; the number of the second bus and the number of the third bus correspond to that of the first bus, and the second bus and the third bus respectively comprise three electric conductors which are respectively an electric conductor A, an electric conductor B and an electric conductor C;

three electric conductors in the second bus are sequentially arranged at the bottom of the switch body in parallel, a second fixed contact is arranged at the front end of the second bus, a second movable contact in the first movable contact component is respectively lapped with the second fixed contact in the second bus, and the other end of a first flexible connection in the first movable contact component is respectively connected with the second bus; the rear end of the second bus is connected with the bottom end of the third bus, the other end of the third bus is connected with the upper discharge bus, the upper discharge bus is arranged at the upper discharge position of the top of the switch body, a first wiring terminal is arranged at the front end of the upper discharge bus and serves as a group of discharge wiring, and the discharge wiring is electrically connected with one wiring terminal of the external motor M;

the second moving contact component comprises a mandrel, a first moving contact, a second flexible connection and an arc swing arm, wherein the first moving contact and the second moving contact are respectively positioned on two sides of the arc swing arm with the mandrel as the center of a circle, and the arc swing arm can swing left and right along with the mandrel;

the lower discharge bus is arranged at the lower row position of the bottom of the switch body, a second wiring terminal corresponding to the first wiring terminal is arranged at the front end of the lower discharge bus and serves as another group of discharge wiring, and the discharge wiring is electrically connected with another row of wiring terminals in the external motor M; a welding contact connected with a second flexible connection in the second movable contact assembly is arranged at the rear end of the lower discharge bus;

the first connecting bus is arranged at the right side position above the second movable contact assembly, and the second connecting bus is arranged at the left side position above the second movable contact assembly; a right contact point corresponding to a second moving contact in the second moving contact component is arranged in the first connecting bus, and a left contact point corresponding to a first moving contact in the second moving contact component is arranged in the second connecting bus;

the second movable contact component can swing left and right along with the mandrel under the action of the arc swing arm to drive a first movable contact in the second movable contact component to be in direct-collision connection with a left contact point in a second connecting bus or drive a second movable contact in the second movable contact component to be in direct-collision connection with a right contact point in a first connecting bus, so that three parallel star-triangle change-over switches are formed between the second movable contact component and the first connecting bus as well as between the second movable contact component and the second connecting bus;

the upper discharging bus is connected with the first connecting bus, a first conductor is further arranged between the upper discharging bus and the first connecting bus, and when the second moving contact component swings clockwise along with the mandrel, and the second moving contact in the second moving contact component is in direct contact connection with the right contact point in the first connecting bus, a triangular connection is formed through the first conductor; in the process that the second moving contact component swings along with the mandrel anticlockwise, when the second moving contact component swings to the state that the first moving contact in the second moving contact component is in direct contact connection with the left contact point in the second connecting bus, the second moving contact component is electrically connected with the second connecting bus through the second conductor to form star connection;

and a second arc extinguish chamber is arranged near the outer sides of the left contact point in the second connecting bus and the first moving contact in the second moving contact component, and a third arc extinguish chamber is arranged near the outer sides of the right contact point in the first connecting bus and the second moving contact in the second moving contact component.

Furthermore, the switch structure of the invention, wherein the lower discharge bus, the upper discharge bus, the first connection bus and the second connection bus are all composed of three electric conductors, and the three electric conductors are numbered as No. 1 electric conductor, No. 2 electric conductor and No. 3 electric conductor respectively; the No. 1 electric conductor, the No. 2 electric conductor and the No. 3 electric conductor in the lower discharge bus are sequentially arranged at the lower discharge position at the bottom of the switch body in parallel, the No. 1 electric conductor, the No. 2 electric conductor and the No. 3 electric conductor in the upper discharge bus are sequentially arranged at the upper discharge position at the top of the switch body in parallel, the three electric conductors in the first connection bus are sequentially arranged above the upper discharge bus in parallel according to the arrangement sequence of the No. 3 electric conductor, the No. 1 electric conductor and the No. 2 electric conductor, and the No. 1 electric conductor and the No. 2 electric conductor in the upper discharge bus are respectively connected with the No. 1 electric conductor and the No. 2 electric conductor in the first connection;

when the second moving contact component swings clockwise along with the mandrel and the second moving contact in the second moving contact component swings to be in direct contact connection with the right contact point in the first connecting bus, the second moving contact component is respectively connected with the No. 3 electric conductor in the upper discharging bus and the No. 3 electric conductor in the first connecting bus through the first electric conductor to form a triangular connection;

and in the process that the second moving contact component swings anticlockwise along with the mandrel, when the first moving contact in the second moving contact component swings to be in direct contact connection with the left contact point in the second connecting bus, the second moving contact component is electrically connected with the second connecting bus through the second conductor to form star connection.

Further, in the switch structure of the present invention, the first movable contact assembly further includes a support arm, a transmission rod, a swing arm, a rotation shaft, and a connection bolt, the support arm is connected to one end of the transmission rod through the connection bolt, the rotation shaft is disposed in the swing arm, a lower end of the swing arm is connected to the other end of the transmission rod through the connection bolt, the first movable contact is disposed at an upper end of the support arm and corresponds to the first fixed contact in the first bus, and a main switch is formed between the first movable contact and the first fixed contact; the second movable contact is arranged at the lower end of the supporting arm and corresponds to a second static contact in the second bus, and the second movable contact and the second static contact are mutually lapped; the first flexible connection is located below the transmission rod, one end of the first flexible connection is fixed in the support arm, an arc-shaped convex part is arranged in the middle of the second bus, the other end of the first flexible connection is connected with the arc-shaped convex part in the second bus in a welding mode, and good electric connection between the first movable contact assembly and the second bus can be kept through the lap joint between the second movable contact and the second fixed contact and the connection between the first flexible connection and the arc-shaped convex part.

Further, according to the switch structure, the first arc extinguish chamber, the second arc extinguish chamber and the third arc extinguish chamber are all arranged to be grid-type arc extinguish chambers, the grid-type arc extinguish chambers are provided with arc extinguish grids, arc burning time at the moment when the main switch and the change-over switch are switched on and switched off can be reduced through the arranged arc extinguish grids, and contact abrasion is reduced.

Further, the switch structure of the present invention, wherein the motor M is a three-phase asynchronous motor.

Further, in the switch structure of the present invention, the delay device is a mechanical delay device or a time relay, and the delay time of the delay device is in a range of 2 to 10 seconds.

Further, in the switch structure of the present invention, the switch body further includes an operating mechanism, the operating mechanism is electrically connected to the main switch and the transfer switch, and the operating mechanism controls the operating state of the motor M to be turned on or off.

Compared with the prior art, the switch structure has the advantages that: through adopting the integral type structure, not only can reach the purpose that the step-down starts, still can eliminate the problem of motor decompression in the twinkling of an eye in voltage switching, can reduce switching impulse current by a wide margin, have compact structure, each functional element overall arrangement scientific and reasonable, it is more convenient to operate, characteristics such as safe and reliable.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings.

FIG. 1 is a first perspective view of the present invention;

FIG. 2 is a schematic perspective view of the present invention;

FIG. 3 is a schematic structural view of the present invention;

FIG. 4 is a schematic view of the structure in the A-A direction connection state in FIG. 3;

FIG. 5 is a schematic structural view of the first movable contact assembly of the present invention;

FIG. 6 is a schematic structural view of a second movable contact assembly according to the present invention;

fig. 7 is a schematic diagram of the circuit structure of the present invention.

Shown in the figure: 1-first bus, 101-first fixed contact, 102-input connecting terminal, 2-first movable contact assembly, 201-first movable contact, 202-second movable contact, 203-rotating shaft, 204-first flexible connection, 205-swing arm, 206-driving rod, 207-supporting arm, 208-connecting bolt, 3-second bus, 301-second fixed contact, 302-arc convex part, 4-second movable contact assembly, 401-mandrel, 402-first movable contact, 403-second movable contact, 404-second flexible connection, 405-arc swing arm, 5-lower discharge bus, 501-welding contact, 502-second connecting terminal, 6-third bus, 7-upper discharge bus, 701-first connecting terminal, 8-a first conductor, 9-a first connecting bus, 901-a right contact, 10-a second conductor, 11-a second connecting bus, 1101-a left contact, 12-a first arc-extinguishing chamber, 13-a second arc-extinguishing chamber, 14-a third arc-extinguishing chamber.

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.

As shown in fig. 1 to 7, the integrated star-delta start switch structure of the present invention includes a switch body with a control circuit, the switch body includes a main switch, a transfer switch, a delay device and an operating mechanism, an input end of the main switch is electrically connected to L1 phase, L2 phase and L3 phase of an external AC three-phase power inlet wire, an output end of the main switch is connected to an input end of the transfer switch, an output circuit of the transfer switch is electrically connected to an external motor M, wherein the motor M is a three-phase asynchronous motor; the output circuit of the change-over switch comprises a plurality of star-delta change-over switches, the motor M is started through the main switch, the star-delta change-over switches control the motor M to start in a star-delta mode, the star-delta change-over switches are delayed by a delay device and then switched to a delta connection mode, normal operation of the motor M is achieved, the operating mechanism is respectively electrically connected with the main switch and the change-over switches, and the operating mechanism controls the starting or stopping working state of the motor M; the time delay device is a mechanical time delay device or a time relay, and the time delay range of the time delay device is 2-10 seconds.

Further, the integrated star-delta starting switch structure specifically comprises a first bus 1, a first moving contact assembly 2, a second bus 3, a second moving contact assembly 4, a lower discharge bus 5, a third bus 6, an upper discharge bus 7, a first conductor 8, a first connecting bus 9, a second conductor 10, a second connecting bus 11, a first arc-extinguishing chamber 12, a second arc-extinguishing chamber 13 and a third arc-extinguishing chamber 14; the first bus 1, the second bus 3 and the third bus 6 comprise three electric conductors, namely an electric conductor A, an electric conductor B and an electric conductor C; the lower discharge bus 5, the upper discharge bus 7, the first connection bus 9 and the second connection bus 11 are all composed of three conductors, and the three conductors are numbered as No. 1 conductor, No. 2 conductor and No. 3 conductor respectively. Wherein the three electrical conductors A, B and C in the second bus bar 3 are identified as A3, B3 and C3, respectively; the No. 1 conductor, the No. 2 conductor and the No. 3 conductor in the lower discharge bus 5 are respectively marked as No. 1 5, No. 2 5 and No. 3 5; the three electrical conductors A, B and C in the third bus bar 6 are identified as A6, B6 and C6, respectively; the No. 1 conductor, the No. 2 conductor and the No. 3 conductor in the upper discharge bus 7 are respectively marked as No. 1 7, No. 2 7 and No. 3 7; the three conductors in the first connecting bus 9 are respectively marked as No. 3 conductor, No. 1 conductor and No. 2 conductor in sequence according to the arrangement sequence of No. 3 conductor, No. 1 conductor and No. 2 conductor.

Three electric conductors in the first bus 1, namely an electric conductor A, an electric conductor B and an electric conductor C are sequentially arranged on the upper part of the switch body in parallel; and the front end of the first bus 1 is respectively provided with an input wiring terminal 102, and the rear end of the first bus is respectively provided with a first fixed contact 101, and the input wiring terminal 102 can be respectively electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power inlet wire to be used as a three-phase power inlet wire interface of the switch body.

The first movable contact assembly 2 corresponds to the first bus 1 and is provided with three corresponding first movable contact assemblies 2, the first movable contact assemblies 2 are sequentially arranged beside the first fixed contact 101 in parallel, the first movable contact assembly 2 comprises a first movable contact 201, a second movable contact 202 and a first flexible connection 204, and three main switches are respectively formed between the first movable contact 201 and the first fixed contact 101; the second moving contacts 202 on the first moving contact assembly 2 are respectively lapped with the second fixed contacts 301 in the second bus bar 3, and one end of the first flexible connection 204 on the first moving contact assembly 2 is respectively welded with the second bus bar 3, so that good electrical connection between the first moving contact assembly 2 and the second bus bar 3 is ensured.

The three conductors in the second bus 3, that is, the conductor a, the conductor B, and the conductor C, are sequentially arranged in parallel at the bottom of the switch body, and the second stationary contact 301 is located at the upper end of the second bus 3. The lower ends of the second bus bars 3 are respectively connected with the bottom ends of the third bus bars 6; the other ends of the third bus bars 6 are respectively connected to the upper discharge bus bars 7. The upper discharge bus 7 is arranged at the upper row position at the bottom of the switch body, the upper discharge bus 7 is respectively provided with a first connecting terminal 701 as a group of discharge connecting terminals, and the discharge connecting terminals are used as connecting terminals of U1/V1/W1 of an external three-phase asynchronous motor; the lower discharging bus 5 is arranged at the lower discharging position at the bottom of the switch body, and a second connecting terminal 502 corresponding to the first connecting terminal 701 is arranged at the front end of the lower discharging bus 5 to be used as another group of discharging connection which is used as a connecting terminal of U2/V2/W2 of an external three-phase asynchronous motor.

The three conductors in the second bus 3 are sequentially arranged at the bottom of the switch body in parallel, a second fixed contact 301 is arranged at the front end of the second bus 3, the second movable contact 202 in the first movable contact assembly 2 is respectively lapped with the second fixed contact 301 in the second bus 3, and the other end of the first flexible connection 204 in the first movable contact assembly 2 is respectively connected with the second bus 3; the rear end of the second bus 3 is connected with the bottom end of the third bus 6, the other end of the third bus 6 is connected with the upper discharge bus 7, the upper discharge bus 7 is arranged at the upper discharge position of the top of the switch body, a first wiring terminal 701 is arranged at the front end of the upper discharge bus 7 and serves as a group of discharge wiring, and the discharge wiring is electrically connected with one wiring terminal of the external motor M; the second movable contact assembly 4 comprises a mandrel 401, a first movable contact 402, a second movable contact 403, a second flexible connection 404 and an arc swing arm 405, wherein the first movable contact 402 and the second movable contact 403 are respectively located on two sides of the arc swing arm 405 with the mandrel 401 as a center, and the arc swing arm 405 can swing left and right along with the mandrel 401; the lower discharge bus 5 is arranged at a lower row position at the bottom of the switch body, a second wiring terminal 502 corresponding to the first wiring terminal 701 is arranged at the front end of the lower discharge bus 5 and serves as another group of discharge wiring, and the discharge wiring is electrically connected with another row of wiring terminals in the external motor M; a welding contact 501 connected with a second soft connection 404 in the second movable contact assembly 4 is arranged at the rear end of the lower discharge bus 5; the first connecting bus 9 is arranged at the right side position above the second movable contact assembly 4, and the second connecting bus 11 is arranged at the left side position above the second movable contact assembly 4; a right contact point 901 corresponding to the second movable contact 403 in the second movable contact assembly 4 is arranged in the first connecting bus 9, and a left contact point 1101 corresponding to the first movable contact 402 in the second movable contact assembly 4 is arranged in the second connecting bus 11; the second movable contact assembly 4 can swing left and right along with the mandrel 401 under the action of the arc swing arm 405, so as to drive the first movable contact 402 in the second movable contact assembly 4 to be in direct contact connection with the left contact 1101 in the second connecting bus 11, or drive the second movable contact 403 in the second movable contact assembly 4 to be in direct contact connection with the right contact 901 in the first connecting bus 9, and thus three parallel star-delta transfer switches are formed between the second movable contact assembly 4 and the first connecting bus 9 as well as between the second movable contact assembly 4 and the second connecting bus 11; the upper discharging bus 7 is connected with a first connecting bus 9, a first conductor 8 is further arranged between the upper discharging bus 7 and the first connecting bus 9, and when the second moving contact assembly 4 swings clockwise along with the mandrel 401, the second moving contact 403 in the second moving contact assembly 4 is in direct contact connection with the right contact point 901 in the first connecting bus 9, a triangular connection is formed through the first conductor 8; in the process that the second movable contact assembly 4 swings anticlockwise along with the spindle 401, when the first movable contact 402 in the second movable contact assembly 4 swings to be in direct contact connection with the left contact point 1101 in the second connecting bus 11, the second movable contact is electrically connected with the second connecting bus 11 through the second conductor 10 to form star connection; a second arc extinguishing chamber 13 is provided in the vicinity of the outer side of the left contact 1101 in the second connecting bus 11 and the first movable contact 402 in the second movable contact assembly 4, and a third arc extinguishing chamber 14 is provided in the vicinity of the outer side of the right contact 901 in the first connecting bus 9 and the second movable contact 403 in the second movable contact assembly 4.

In the process that the second movable contact assembly 4 swings clockwise along with the mandrel 401, when the second movable contact 403 in the second movable contact assembly 4 swings to be in direct contact connection with the right contact point 901 in the first connecting bus 9, the second movable contact 403 is respectively connected with the No. 3 electric conductor in the upper discharging bus 7 and the No. 3 electric conductor in the first connecting bus 9 through the first electric conductor 8, so that a triangular connection is formed; in the process that the second movable contact assembly 4 swings anticlockwise along with the spindle 401, when the first movable contact 402 in the second movable contact assembly 4 swings to be in direct contact connection with the left contact 1101 in the second connection bus 11, the second movable contact is electrically connected with the second connection bus 11 through the second conductor 10, and thus star connection is formed.

Further, the integrated star-delta start switch structure of the present invention, wherein the first movable contact assembly 2 further includes a support arm 207, a transmission rod 206, a swing arm 205, a rotation shaft 203 and a connection bolt 208, the support arm 207 is connected to one end of the transmission rod 206 through the connection bolt 208, the rotation shaft 203 is disposed in the swing arm 205, a lower end of the swing arm 205 is connected to the other end of the transmission rod 206 through the connection bolt 208, the first movable contact 201 is disposed at an upper end of the support arm 207 and corresponds to the first fixed contact 101 in the first bus 1, and a main switch is formed between the first movable contact 201 and the first fixed contact 101; the second moving contact 202 is disposed at the lower end of the supporting arm 207, and corresponds to the second fixed contact 301 in the second bus 3, and the second moving contact 202 and the second fixed contact 301 are overlapped with each other; the first flexible connection 204 is located below the transmission rod 206, one end of the first flexible connection 204 is fixed in the support arm 207, an arc-shaped protrusion 302 is arranged in the middle of the second bus 3, the other end of the first flexible connection 204 is connected with the arc-shaped protrusion 302 in the second bus 3 in a welding manner, and good electrical connection between the first movable contact assembly 2 and the second bus 3 can be achieved through the lap joint between the second movable contact 202 and the second fixed contact 301 and the connection between the first flexible connection 204 and the arc-shaped protrusion 302.

Furthermore, according to the integrated star-delta starting switch structure provided by the invention, the first arc-extinguishing chamber 12, the second arc-extinguishing chamber 13 and the third arc-extinguishing chamber 14 are all arranged into a grid-type arc-extinguishing chamber, the grid-type arc-extinguishing chamber is provided with an arc-extinguishing grid, the arc burning time at the switching-on and breaking moment of the main switch and the change-over switch can be reduced through the arranged arc-extinguishing grid, and the burning loss of contact materials can be effectively protected and reduced.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention.

Claims

1. Integral type star triangle starting switch structure, including switch body and the operating device who takes control circuit, its characterized in that: the switch body comprises a main switch, a change-over switch and a time delay device, wherein the input end of the main switch is electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power inlet wire, the output end of the main switch is connected with the input end of the change-over switch, and the output circuit of the change-over switch is electrically connected with an external motor M; the output circuit of the change-over switch comprises a plurality of star-delta change-over switches, the motor M is started through the main switch, the star-delta change-over switches control the motor M to start in a star-delta mode, the star-delta change-over switches are delayed by the delay device and then switched to a delta connection mode, and normal operation of the motor M is achieved; the motor M is a three-phase asynchronous motor, the delay device is a mechanical delay device or a time relay, and the time range of delay of the delay device is 2-10 seconds; the operating mechanism is respectively electrically connected with the main switch and the change-over switch, and the operating mechanism controls the starting or closing working state of the motor M;

the main switch comprises a first bus (1), a first movable contact assembly (2) and a first arc extinguish chamber (12), wherein the first bus (1) comprises three electric conductors which are respectively an electric conductor A, an electric conductor B and an electric conductor C, and the electric conductor A, the electric conductor B and the electric conductor C in the first bus (1) are sequentially arranged on the upper part of the switch body in parallel; an input wiring terminal (102) is respectively arranged at the front end of the first bus (1), a first fixed contact (101) is respectively arranged at the rear end of the first bus, and the input wiring terminal (102) can be respectively and electrically connected with an L1 phase, an L2 phase and an L3 phase of an external AC three-phase power supply inlet wire to be used as a three-phase power supply inlet wire interface of the switch body; the first movable contact component (2) corresponds to the first bus (1), the first movable contact component (2) is sequentially arranged beside the first fixed contact (101) in parallel, the first movable contact component (2) comprises a first movable contact (201), a second movable contact (202) and a first flexible connection (204), corresponding first arc-extinguishing chambers (12) are arranged on the outer sides of the first fixed contact (101) and the first movable contact (201), and three main switches are respectively formed between the first movable contact (201) and the first fixed contact (101);

the transfer switch comprises a second bus (3), a second movable contact assembly (4), a lower discharge bus (5), a third bus (6), an upper discharge bus (7), a first conductor (8), a first connecting bus (9), a second conductor (10), a second connecting bus (11), a second arc-extinguishing chamber (13) and a third arc-extinguishing chamber (14); the number of the second bus (3) and the number of the third bus (6) correspond to that of the first bus (1), and the second bus and the third bus respectively comprise three electric conductors, namely an electric conductor A, an electric conductor B and an electric conductor C;

three electric conductors in the second bus (3) are sequentially arranged at the bottom of the switch body in parallel, a second fixed contact (301) is arranged at the front end of the second bus (3), a second movable contact (202) in the first movable contact assembly (2) is respectively lapped with the second fixed contact (301) in the second bus (3), and the other end of a first flexible connection (204) in the first movable contact assembly (2) is respectively connected with the second bus (3); the rear end of the second bus (3) is connected with the bottom end of the third bus (6), the other end of the third bus (6) is connected with the upper discharge bus (7), the upper discharge bus (7) is arranged at the upper discharge position of the top of the switch body, a first wiring terminal (701) is arranged at the front end of the upper discharge bus (7) and serves as a group of discharge wiring, and the discharge wiring is electrically connected with one wiring terminal of an external motor M;

the second movable contact component (4) comprises a mandrel (401), a first movable contact (402), a second movable contact (403), a second flexible connection (404) and an arc swing arm (405), wherein the first movable contact (402) and the second movable contact (403) are respectively positioned on two sides of the arc swing arm (405) with the mandrel (401) as a circle center, and the arc swing arm (405) can swing left and right along with the mandrel (401);

the lower discharge bus (5) is arranged at the lower row position of the bottom of the switch body, a second wiring terminal (502) corresponding to the first wiring terminal (701) is arranged at the front end of the lower discharge bus (5) and serves as another group of discharge wiring, and the discharge wiring is electrically connected with another row of wiring terminals in the external motor M; a welding contact (501) connected with a second soft connection (404) in the second movable contact component (4) is arranged at the rear end of the lower discharge bus (5);

the first connecting bus (9) is arranged at the right side position above the second movable contact assembly (4), and the second connecting bus (11) is arranged at the left side position above the second movable contact assembly (4); a right contact point (901) corresponding to a second moving contact (403) in the second moving contact component (4) is arranged in the first connecting bus (9), and a left contact point (1101) corresponding to a first moving contact (402) in the second moving contact component (4) is arranged in the second connecting bus (11);

the second movable contact component (4) can swing left and right along with the mandrel (401) under the action of the arc swing arm (405), so that a first movable contact (402) in the second movable contact component (4) is driven to be in direct contact connection with a left contact point (1101) in a second connecting bus (11), or a second movable contact (403) in the second movable contact component (4) is driven to be in direct contact connection with a right contact point (901) in a first connecting bus (9), and three parallel star-triangle change-over switches are formed between the second movable contact component (4) and the first connecting bus (9) as well as between the second connecting bus (11);

the upper discharging bus (7) is connected with the first connecting bus (9), a first conductor (8) is further arranged between the upper discharging bus (7) and the first connecting bus (9), and when the second movable contact component (4) swings clockwise along with the mandrel (401), a second movable contact (403) in the second movable contact component (4) is in direct contact connection with a right contact point (901) in the first connecting bus (9), a triangular connection is formed through the first conductor (8); in the process that the second movable contact component (4) swings anticlockwise along with the mandrel (401), when a first movable contact (402) in the second movable contact component (4) is in direct contact connection with a left contact point (1101) in a second connecting bus (11), the second movable contact component is electrically connected with the second connecting bus (11) through the second conductor (10) to form star connection;

a second arc-extinguishing chamber (13) is arranged near the outer side of a left contact point (1101) in the second connecting bus (11) and a first movable contact (402) in the second movable contact component (4), and a third arc-extinguishing chamber (14) is arranged near the outer side of a right contact point (901) in the first connecting bus (9) and a second movable contact (403) in the second movable contact component (4).

2. The integrated star-delta actuated switch structure of claim 1, further comprising: the lower discharge bus (5), the upper discharge bus (7), the first connecting bus (9) and the second connecting bus (11) are all composed of three electric conductors, and the serial numbers of the three electric conductors are respectively No. 1 electric conductor, No. 2 electric conductor and No. 3 electric conductor; the number 1 electric conductor, the number 2 electric conductor and the number 3 electric conductor in the lower discharge bus (5) are sequentially arranged in parallel at the lower row position at the bottom of the switch body, the number 1 electric conductor, the number 2 electric conductor and the number 3 electric conductor in the upper discharge bus (7) are sequentially arranged in parallel at the upper row position at the top of the switch body, the three electric conductors in the first connection bus (9) are sequentially arranged in parallel above the upper discharge bus (7) according to the arrangement sequence of the number 3 electric conductor, the number 1 electric conductor and the number 2 electric conductor, and the number 1 electric conductor and the number 2 electric conductor in the upper discharge bus (7) are respectively connected with the number 1 electric conductor and the number 2 electric conductor in the first connection bus (9) correspondingly;

in the process that the second movable contact component (4) swings clockwise along with the mandrel (401), when a second movable contact (403) in the second movable contact component (4) swings to be in direct contact connection with a right contact point (901) in the first connecting bus (9), the second movable contact component is respectively connected with a No. 3 electric conductor in the upper discharging bus (7) and a No. 3 electric conductor in the first connecting bus (9) through a first electric conductor (8) to form triangular wiring;

in the process that the second movable contact component (4) swings anticlockwise along with the mandrel (401), when the first movable contact (402) in the second movable contact component (4) swings to be in direct contact connection with the left contact point (1101) in the second connecting bus (11), the second movable contact component is electrically connected with the second connecting bus (11) through the second conductor (10), and star connection is formed.

3. The integrated star-delta actuated switch structure of claim 1, further comprising: the first movable contact assembly (2) further comprises a supporting arm (207), a transmission rod (206), a swing arm (205), a rotating shaft (203) and a connecting bolt (208), wherein the supporting arm (207) is connected with one end of the transmission rod (206) through the connecting bolt (208), the rotating shaft (203) is arranged in the swing arm (205), the lower end of the swing arm (205) is connected with the other end of the transmission rod (206) through the connecting bolt (208), the first movable contact (201) is arranged at the upper end of the supporting arm (207) and corresponds to a first fixed contact (101) in the first bus (1), and a main switch is formed between the first movable contact (201) and the first fixed contact (101); the second movable contact (202) is arranged at the lower end of the supporting arm (207) and corresponds to a second fixed contact (301) in the second bus (3), and the second movable contact (202) and the second fixed contact (301) are mutually lapped; the first flexible connection (204) is located below the transmission rod (206), one end of the first flexible connection (204) is fixed in the support arm (207), an arc-shaped convex part (302) is arranged in the middle of the second bus (3), the other end of the first flexible connection (204) is connected with the arc-shaped convex part (302) in the second bus (3) in a welding mode, and good electrical connection between the first movable contact assembly (2) and the second bus (3) can be kept through the lap joint between the second movable contact (202) and the second fixed contact (301) and the connection between the first flexible connection (204) and the arc-shaped convex part (302).

4. The integrated star-delta actuated switch structure of claim 1, further comprising: first explosion chamber (12), second explosion chamber (13) and third explosion chamber (14) all set up to grid type explosion chamber, grid type explosion chamber has the arc extinguishing bars, can reduce main switch and change over switch through the arc extinguishing bars that set up and put through the instantaneous time of arcing in breaking, reduce contact wear.