CN210743812U - Double-power-supply change-over switch - Google Patents

Abstract

A dual-power transfer switch belongs to the technical field of low-voltage appliances. Including disconnected unit, disconnected unit includes casing, moving contact, first, second static contact, load side wiring terminal and flexible coupling, and the flexible coupling includes interconnect's contact connecting conductor and terminal connecting conductor, and when the moving contact rotated with the first direction, the power supply of first power was realized to the switch, and when the moving contact rotated with the second direction, the power supply of second power, characteristics were realized to the switch: a contact pressure compensation structure is arranged in the shell, and when the moving contact is contacted with the first fixed contact, the direction of an electric force on the flexibly-connected contact connecting conductor is the direction of deflecting the moving contact to the first fixed contact by the contact pressure compensation structure; when the moving contact is contacted with the second fixed contact, the direction of the electric force on the contact connecting conductor of the flexible connection is the direction of the moving contact deflecting towards the second fixed contact by the pressure compensation structure. The contact pressure when improving the combined floodgate state improves dual supply change over switch's dynamic and thermal stability, simple structure.

Description

Double-power-supply change-over switch

Technical Field

The utility model belongs to the technical field of low-voltage apparatus, concretely relates to dual supply change over switch.

Background

In modern power supply systems, especially some important loads, dual power supply systems are commonly used, i.e. a common power supply and a standby power supply alternately supply power to the loads through appropriate power supply changeover switching devices. The contact mechanism in the transfer switch electric appliance is a mechanism directly connected with a power supply, the contact in the contact mechanism is divided into a moving contact and a static contact according to the condition of moving or not, and the contact mechanism can be divided into a finger-shaped clapper type and a knife-shaped plug-in type according to the combination mode. Because the finger-type clapper type contact can resist burning under the action of electric arcs when a circuit is closed or opened, and has higher connection and disconnection capacities, most of the contact mechanisms of the dual-power switch in the current market adopt the finger-type clapper type. However, because the node electrodynamic force of the contact is of a repulsive force type, the dynamic and thermal stability of the contact is poor, and particularly in large-size products, the high current can cause the switch to be repelled at the closing moment, so that the contact is quickly lost. In order to prevent the repulsion of the contact under the action of higher current, the contact pressure needs to be increased, and the overhigh contact pressure increases the power consumption and the volume of an operating system and correspondingly reduces the service lives of the operating system and the contact system on one hand, and is not beneficial to the breaking of the switch due to the offsetting of electric repulsion on the other hand, thereby limiting the breaking capacity of the switch.

In view of the above-mentioned prior art, there is a need for a reasonable improvement of the existing dual power transfer switch structure. The applicant has therefore made an advantageous design, in the context of which the solution to be described below is made.

Disclosure of Invention

The utility model aims at providing a dual power transfer switch, this dual power transfer switch contact pressure when can improve the combined floodgate state improves dual power transfer switch's dynamic thermal stability, simple structure simultaneously.

The utility model aims to accomplish the task in this way, a dual power transfer switch, includes one or more disconnected unit, every disconnected unit all include the casing, rotate the moving contact that sets up in the casing, fix first static contact and the second static contact in the casing, fix load side binding post on the casing, and both ends respectively with the moving contact and the flexible coupling of load side binding post electricity connection, the flexible coupling include the contact connecting conductor that is connected with the moving contact electricity and the terminal connecting conductor that is connected with load side binding post electricity of interconnect, when the moving contact rotates to contact with first static contact with first direction, the power supply of first power is realized to the switch, when the moving contact rotates to when contacting with second static contact with second direction opposite direction with first direction, the switch realizes the power supply of second power, the casing in be equipped with the pressure compensation structure of contact, when the moving contact is contacted with the first fixed contact, the direction of the electric force on the contact connecting conductor of the flexible connection is the direction of the moving contact deflecting towards the first fixed contact by the contact pressure compensation structure; when the moving contact is contacted with the second fixed contact, the direction of the electric force on the contact connecting conductor of the flexible connection is the direction of the moving contact deflecting towards the second fixed contact by the pressure compensation structure.

In an embodiment of the present invention, the contact pressure compensation structure includes a first stopping portion and a second stopping portion disposed in the housing, when the moving contact contacts with the first fixed contact, the flexible connection is blocked by the first stopping portion to generate a shape change, the flexible connection is in a first notch shape with an opening spreading to both sides, and the contact connecting conductor and the terminal connecting conductor on the flexible connection respectively form two opposite sides of the notch shape; when the moving contact is contacted with the second fixed contact, the flexible connection is blocked by the second blocking part to generate shape change, the flexible connection is in a second notch shape with an opening spreading to two sides, and the contact connecting conductor and the terminal connecting conductor on the flexible connection respectively form two opposite side edges of the notch shape; the first notch-shaped opening and the second notch-shaped opening are opposite.

In another embodiment of the present invention, when the moving contact is in contact with the first fixed contact, the first stopping portion limits the terminal connection conductor; when the moving contact is contacted with the second fixed contact, the second stopping part limits the terminal connecting conductor.

In another embodiment of the present invention, the housing is provided with a moving contact cavity for accommodating the moving contact and the flexible connection, the first blocking portion and the second blocking portion are formed by two cavity walls of the moving contact cavity, and the distance between the two cavity walls is gradually reduced from the position close to the moving contact to the position close to the load-side terminal.

In another embodiment of the present invention, the end of the first stopping portion near the movable contact is bent to form a first stopping extension, and the end of the second stopping portion near the movable contact is bent to form a second stopping extension, so that the first stopping portion is bent at an obtuse angle, and the second stopping portion is bent at an obtuse angle.

In still another embodiment of the present invention, the movable contact include that the contact supports and supports the rotatory movable guide arm of drive by the contact, movable guide arm both ends be fixed with first movable contact and second movable contact respectively, the inside cavity that is equipped with of contact support, the outer periphery that the cavity both ends extended to the contact support forms first spout and second spout, the both ends of moving the guide arm slide and stretch out the contact support outer periphery in first spout and second spout respectively, the one end cell wall of second spout and first spout has constituted first fulcrum and the second fulcrum that the guide arm directly or indirectly leaned on.

In yet another embodiment of the present invention, the first static contact includes a first static guide rod and other components, the second static contact includes a second static guide rod and other components, and the structures of the first static contact and the second static contact are the same and are arranged symmetrically with respect to a plane passing through the contact support rotation center line except that the structures of the first static guide rod and the second static guide rod are different; the other parts comprise contacts, the first static guide rod comprises a first fixed plate connected with the first power supply connecting terminal and a first contact mounting plate for mounting the contacts, a contact welding boss is punched at one end of the first contact mounting plate of the first static guide rod, the thickness of the contact welding boss is smaller than that of the first static guide rod, the contact of the first static contact is welded on the contact welding boss of the first static guide rod, the second static guide rod comprises a second fixed plate connected with the second power supply connecting terminal and a second contact mounting plate for mounting the contacts, a contact welding boss is punched at one end of the second contact mounting plate of the second static guide rod, the thickness of the contact welding boss is smaller than that of the second static guide rod, and the contact of the second static contact is welded on the contact welding boss of the second static guide rod, and in the rotating process of the movable guide rod, the first movable contact is correspondingly matched with the contact of the first fixed contact, and the second movable contact is correspondingly matched with the contact of the second fixed contact.

In a further embodiment of the present invention, the dual power transfer switch further comprises a first arc-extinguishing device and a second arc-extinguishing device disposed in the housing, the first arc-extinguishing device and the second arc-extinguishing device respectively correspond to a contact of the first stationary contact and a contact of the second stationary contact, the first arc-extinguishing device and the second arc-extinguishing device respectively comprise a plurality of arc-extinguishing barrier sheets disposed at intervals, side partition plates disposed at both sides of the plurality of arc-extinguishing barrier sheets and parallel to the arrangement direction of the plurality of arc-extinguishing barrier sheets, and partition plates for partitioning the grid legs of each arc-extinguishing barrier sheet, grid bosses are disposed at both sides of each arc-extinguishing barrier sheet facing the side partition plates, grid boss insertion holes and partition plate boss insertion holes are disposed on the side partition plates, ribs and partition plate bosses are disposed on the partition plates, the plurality of arc-extinguishing barrier sheets are riveted after the grid bosses pass through the grid boss insertion holes on the side partition plates at both sides, the baffle piece pass through baffle piece boss jack on the side baffle after the riveting firmly, the muscle insert in the grid leg of every arc extinguishing bars piece, make the grid leg keep certain interval, the side baffle still is provided with slottedly, first arc extinguishing device cooperation boss or the cooperation boss phase-match of second arc extinguishing device on groove and the casing for the installation location of first arc extinguishing device or second arc extinguishing device.

In yet another embodiment of the present invention, the other components further include an arc tab, a sampling terminal, and a rivet, the first contact mounting plate of the first stationary guide bar is fixed with the arc tab at a position away from the contact by the rivet, the arc tab on the first stationary contact and the contact on the first stationary contact are spaced by 2mm to 3mm, the tail of the arc tab of the first stationary contact tilts to be close to the first arc extinguisher, and the sampling terminal on the first stationary contact is riveted to the first stationary guide bar by the first boss on the back of the first stationary guide bar; and an arc striking plate is fixed on the second contact mounting plate of the second fixed guide rod at a position away from the contact by a certain distance through a rivet, the arc striking plate on the second fixed contact is spaced from the contact on the second fixed contact by 2-3 mm, the tail part of the arc striking plate of the second fixed contact tilts to be close to the second arc extinguishing device, and the sampling terminal on the second fixed contact is riveted on the second fixed guide rod through a second boss on the back surface of the second fixed guide rod.

The utility model discloses a still more in one embodiment, the moving contact including be used for with the movable guide pole to the contact support keep leaning on the spring unit that leans on, disconnected unit divide into the disconnected unit of the utmost point disconnected unit of the phase that corresponds the power phase line and the disconnected unit of the utmost point N that corresponds power N line, disconnected unit of the utmost point disconnected unit of the phase and the disconnected unit difference of the utmost point N lie in: the movable contact of the N-pole breaking unit is provided with a movable guide rod and a contact support, the movable guide rod, the movable support and the contact support of the N-pole breaking unit are sequentially pressed by pressure provided by a spring assembly, the movable guide rod and the contact support of the N-pole breaking unit are not pressed by the pressing plate, and the movable guide rod and the contact support of the N-pole breaking unit are directly pressed by the pressure provided by the spring assembly.

In yet another embodiment of the present invention, the pair of the abutting plates is symmetrically installed at positions corresponding to the first fulcrum and the second fulcrum on the movable guide rod of the phase pole dividing unit, the abutting plates are U-shaped parts, the outer circular arc surface at the bottom of the U-shaped structure of the abutting plates is used for abutting against the first fulcrum or the second fulcrum, the U-shaped inner groove of the abutting plates covers the movable guide rod, the opening of the U-shaped structure of the abutting plates is provided with a buckle extending inwards, and the buckle is engaged with the movable guide rod.

In a further embodiment of the present invention, the dual power transfer switch further includes an operating mechanism, the N-pole breaking unit and the phase breaking unit are sequentially arranged side by side, one end of the contact support of the N-pole breaking unit is in transmission connection with the operating mechanism, and the other end of the contact support of the phase breaking unit is in transmission connection with the contact support of the phase breaking unit, the contact support of the N-pole breaking unit and the contact support of the phase breaking unit are driven by the operating mechanism to synchronously rotate, when the dual power transfer switch is switched from the first power supply to the second power supply, the N-pole breaking unit disconnects the first power phase line later than the phase breaking unit, and the N-pole breaking unit disconnects the second power phase line earlier than the phase breaking unit; when the double-power-supply change-over switch is switched from the second power supply to the first power supply, the N-pole breaking unit breaks the N line of the second power supply and breaks the phase line of the second power supply later than the phase-pole breaking unit, and the N-pole breaking unit is connected with the N line of the first power supply and is connected with the phase line of the first power supply earlier than the phase-pole breaking unit.

The utility model discloses owing to adopted above-mentioned structure, the beneficial effect who has: firstly, a contact pressure compensation structure is arranged in a shell, and further, the contact pressure compensation structure is that a stopping part capable of limiting the flexible connection is arranged in the shell, when a moving contact and a static contact are contacted, current flows through the flexible connection, the flexible connection is limited by the stopping part, so that the flexible connection is in a notch shape with an opening spreading to two sides, the current forms an electrodynamic force on the flexible connection, the force enables a terminal connecting conductor close to a load side terminal to be tightly attached to the stopping part, the contact connecting conductor close to a moving contact outwards forms a tension beneficial to the increase of contact pressure at a closing position, so that a force enabling the moving contact to deflect towards the direction of the static contact is increased, the contact pressure electrodynamic force compensation is realized, after the implementation of the scheme, the current peak value reaches 9000A and the contact pull-floating phenomenon does not occur, and the current peak value of a switch in the prior art can only reach about 6000A at the maximum, therefore, the repulsion phenomenon of the contact under the heavy current is prevented, and the dynamic thermal stability of the switch is improved; second, the N-pole breaking unit of the dual-power-supply change-over switch can be firstly closed and then separated relative to other phase-pole breaking units, so that the N line on the load side and the N line on the power supply side can be firstly connected at any time when the phase-pole breaking units are connected, unbalanced voltage cannot be generated on the load side, and equipment cannot be burnt; thirdly, the technical scheme has simple structure, small change, high part universality and low cost, and ingenious design is carried out on the basis of the prior art, thereby achieving ideal effect.

Drawings

Fig. 1 is a structural diagram of each pole breaking unit in the dual power transfer switch contact device of the present invention.

Fig. 2 is an exploded view of fig. 1.

Fig. 3 is a schematic structural diagram of a breaking unit casing of the dual power transfer switch of the present invention.

Fig. 4 is a schematic structural diagram of the inside of the housing when the breaking unit of the dual power transfer switch of the present invention is disconnected.

Fig. 5 is a schematic structural diagram of the interior of the housing when the dual power transfer switch connects the load to the first power source.

Fig. 6 is an exploded schematic view of the first static contact of the dual power transfer switch of the present invention.

Fig. 7 is the utility model discloses a dual power transfer switch's first quiet guide arm and sampling terminal's cooperation sketch map.

Fig. 8 is an exploded schematic view of the second static contact of the dual power transfer switch of the present invention.

Fig. 9 is the utility model discloses a two power transfer switch's the quiet guide arm of second and the cooperation sketch map of sampling terminal.

Fig. 10 is a schematic structural diagram of the first or second arc extinguishing device of the dual power transfer switch according to the present invention.

Fig. 11 is a schematic structural diagram of the dual power transfer switch of the present invention.

Fig. 12a is a block diagram of a phase pole dividing unit of the dual power transfer switch of the present invention.

Fig. 12b is a block diagram of an N-pole breaking unit of the dual power transfer switch of the present invention.

Fig. 13a is a schematic structural view of a moving contact of a phase pole breaking unit of the dual power transfer switch of the present invention.

Fig. 13b is a schematic structural view of the moving contact of the N-pole breaking unit of the dual power transfer switch of the present invention.

Fig. 14 is an overall structure diagram of the moving contact of the phase pole breaking unit of the dual power transfer switch of the present invention.

FIG. 15 is an exploded view of the moving contact of the phase pole breaking unit of the dual power transfer switch of the present invention

Fig. 16 is a structural diagram of the first contact support of the dual power transfer switch of the present invention.

Fig. 17 is a structural diagram of the second contact support of the dual power transfer switch of the present invention.

Fig. 18 is a structural diagram of a spring assembly of the dual power transfer switch of the present invention.

Fig. 19a is a schematic diagram of the dual power transfer switch of the present invention, when the dual power transfer switch is in the first operating position, the moving contact of the phase separation unit is in contact with the first stationary contact.

Fig. 19b is a schematic diagram of the moving contact of the N-pole breaking unit contacting with the first fixed contact when the dual power transfer switch is in the first operating position.

Fig. 20a is a schematic diagram of the movable contact and the first stationary contact of the phase pole breaking unit of the present invention being just separated after the contact support of the phase pole breaking unit rotates counterclockwise by a certain angle from the first working position.

Fig. 20b is a schematic diagram of the moving contact of the N-pole breaking unit of the present invention still contacting with the first fixed contact after the contact of the N-pole breaking unit supports counterclockwise rotation from the first working position by a certain angle.

Fig. 21a is a schematic diagram of the contact support of the phase pole dividing unit according to the present invention, after rotating a certain angle counterclockwise from the first working position, the moving contact of the phase pole dividing unit is separated from the first stationary contact.

Fig. 21b is a schematic diagram of the contact support of the N-pole breaking unit of the present invention rotating counterclockwise from the first working position by a certain angle, and then separating the moving contact of the N-pole breaking unit from the first fixed contact.

Fig. 22a is a schematic diagram of the movable contact of the phase pole breaking unit of the present invention approaching to but not contacting the second stationary contact after the contact support of the phase pole breaking unit of the present invention continues to rotate counterclockwise by a certain angle from the first working position.

Fig. 22b is a schematic diagram of the moving contact of the N-pole breaking unit of the present invention just contacting with the second stationary contact after the contact of the N-pole breaking unit supports the counter-clockwise rotation from the first working position by a certain angle.

Fig. 23a is a schematic diagram of the movable contact and the second stationary contact of the phase pole breaking unit when the contact support of the phase pole breaking unit of the present invention reaches the second working position after continuing to rotate counterclockwise by a certain angle from the first working position.

Fig. 23b is a schematic diagram of the moving contact of the N-pole breaking unit still contacting with the second static contact when the contact support of the N-pole breaking unit of the present invention continues to rotate counterclockwise by a certain angle from the first working position and then reaches the second position.

Fig. 24a is a schematic diagram of the movable contact and the second stationary contact of the phase pole breaking unit of the present invention being just separated after the contact support of the phase pole breaking unit rotates clockwise from the second working position by a certain angle.

Fig. 24b is a schematic diagram of the moving contact of the N-pole breaking unit still contacting with the second static contact after the contact support of the N-pole breaking unit of the present invention rotates clockwise from the second working position by a certain angle.

Fig. 25a is a schematic diagram of the contact support of the phase pole breaking unit of the present invention rotating clockwise from the second working position by a certain angle, and then the moving contact of the phase pole breaking unit is separated from the second stationary contact.

Fig. 25b is a schematic diagram of the contact support of the N-pole breaking unit of the present invention rotating clockwise by a certain angle from the second working position, and then the moving contact of the N-pole breaking unit is separated from the second static contact.

Fig. 26a is a schematic diagram of the movable contact of the phase pole breaking unit of the present invention being close to but not in contact with the first stationary contact after the contact support of the phase pole breaking unit of the present invention continuously rotates clockwise from the second working position by a certain angle.

Fig. 26b is a schematic diagram of the moving contact of the N-pole breaking unit just contacting the first fixed contact after the contact support of the N-pole breaking unit continues to rotate clockwise from the second working position by a certain angle.

In the figure: 1. the arc extinguishing device comprises a left base, a right base, a first static contact accommodating cavity, a second static contact accommodating cavity, a load wiring terminal accommodating cavity, a load wiring;

2. the contact comprises a moving contact, 21, a contact support, 211, a first contact support, 2111, a cylindrical boss, 2112, a first fulcrum I, 2112', a second fulcrum I, 2113, a first contact first groove, 2114, a first contact second groove, 2115, a first limit port, 2116, a first limit groove, 2118, a first sliding surface, 2119 and a driving groove, wherein the moving contact is arranged in the groove; 212. the second contact support, 2121, a cylindrical groove, 2122, a first fulcrum II, 2122', a second fulcrum II, 2123, a second contact first groove, 21231, a hanging shaft through hole, 2124, a second contact second groove, 2125, a second limiting port, 2126, a second limiting groove, 2128, a second sliding surface, 2129 and a driving boss; 22. a movable guide rod 221, a guide rod groove; 23. a first movable contact; 24. a second movable contact; 25. the spring assembly, 251, a first spring pair, 251', a second spring pair, 2511, a shaft, 25111, a groove, 2512, a tension spring, 25121, a first draw hook and 25122, and a second draw hook; 26. the hanging shaft, the cover 27, the cover 271, the buckle 272 and the cover bulge; 28. a leaning plate, 281 arc surfaces, 282 inner grooves, 283 buckles;

3. the contact structure comprises a first fixed contact, a first fixed guide rod, a first fixed plate, a first boss, a first contact mounting plate, a first rivet hole, a second fixed contact, a second fixed guide rod, a second fixed plate, a second boss, a second contact mounting plate, a second rivet hole, a second contact mounting plate, a second contact mounting;

4. the arc extinguishing device comprises a first arc extinguishing device, a second arc extinguishing device, 41 arc extinguishing grids, 411 grid bosses, 412 grid legs, 42 side partition plates, 421 grid boss insertion holes, 422 partition plate boss insertion holes, 423 grooves, 43 partition plate parts, 431 ribs and 432 partition plate bosses, wherein the grid legs are arranged on the first arc extinguishing device;

5. a partition plate; 6. flexible connection, 61 contact connecting conductor, 62 terminal connecting conductor; 7. a load side terminal; 8. the pressure compensation structure comprises a pressure compensation structure 81, a first stopping part 811, a first stopping extension 82, a second stopping part 821 and a second stopping extension; 10. a phase electrode breaking unit and a 20.N electrode breaking unit; 30. a first fulcrum; 40. a second fulcrum; 50. the cavity comprises a cavity body 501, a first sliding groove 502 and a second sliding groove; 60. an operating mechanism.

Detailed Description

The following detailed description of the embodiments of the present invention will be described with reference to the accompanying drawings, but the description of the embodiments by the applicant is not intended to limit the technical solutions, and any changes made according to the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, any concept relating to the directions or orientations of the upper, lower, left, right, front and rear is based on the position shown in the specific drawings, and thus should not be construed as particularly limiting the technical solution provided by the present invention.

Referring to fig. 1 to 5 and 11, the present invention relates to a dual power transfer switch, which includes a contact device, the contact device includes one or more dividing units, for example, the switch may be a three-pole switch, which includes three dividing units, or a four-pole switch, which includes four dividing units. In this embodiment, the breaking unit is divided into a phase breaking unit 10 corresponding to a power phase line and an N-pole breaking unit 20 corresponding to a power N line. Firstly, the same structure of a phase electrode breaking unit 10 and an N electrode breaking unit 20 as a single breaking unit is introduced, the breaking units each include a housing, a movable contact 2 rotatably disposed in the housing, a first fixed contact 3 and a second fixed contact 3 'fixed in the housing, a load side terminal 7 fixed on the housing, and a flexible connection 6 having two ends electrically connected to the movable contact 2 and the load side terminal 7, respectively, the first fixed contact 3 is connected to a first power supply, and the second fixed contact 3' is connected to a second power supply. When all moving contacts 2 of the dual-power transfer switch rotate to be in contact with the first fixed contact 3 in a first direction, the switch realizes the power supply of a first power supply, and when all moving contacts 2 of the dual-power transfer switch rotate to be in contact with the second fixed contact 3' in a second direction opposite to the first direction, the switch realizes the power supply of a second power supply.

As shown in fig. 1 to 3, the housing is formed by assembling a left base 1 and a right base 1' which are symmetrically arranged, and the left base 1 and the right base 1' are fastened by screws, and after the left base 1 and the right base 1' are assembled, a first fixed contact accommodating cavity 103 for accommodating a first fixed contact 3, a second fixed contact accommodating cavity 104 for accommodating a second fixed contact 3', a load terminal accommodating cavity 105 for accommodating a load-side terminal 7, a first arc-extinguishing accommodating cavity 106 for accommodating a first arc-extinguishing device 4, a second arc-extinguishing cavity accommodating cavity 107 for accommodating a second arc-extinguishing device 4', and a moving contact accommodating cavity 108 for accommodating a moving contact 2 are formed.

As shown in fig. 2, 4 and 5, the movable contact 2 includes a contact support 21 pivoted in the left base 1 and the right base 1', a movable guide rod 22 driven by the contact support 21 to rotate, a spring assembly 25 for holding the movable guide rod 22 against the contact support 21, a hanging shaft 26 and a cover 27. A first movable contact 23 and a second movable contact 24 are respectively fixed at two ends of the movable guide rod 22, the first fixed contact 3 and the second fixed contact 3' both include contacts 32, the contacts 32 on the first fixed contact 3 and the contacts 32 on the second fixed contact 3' are symmetrically arranged on a plane passing through a rotation center line of the contact support 21, the first movable contact 23 and the contacts 32 of the first fixed contact 3 are correspondingly matched, and the second movable contact 24 and the contacts 32 of the second fixed contact 3' are correspondingly matched in the rotation process of the movable guide rod 22. Further, when the movable guide rod 22 rotates in the first direction, the first movable contact 23 contacts with the contact 32 of the first fixed contact 3; when the movable guide rod 22 rotates in the second direction, the second movable contact 24 contacts with the contact 32 of the second stationary contact 3'.

As shown in fig. 2, 4 to 6, the first static contact 3 includes a first static guide rod 31 and other components, the second static contact 3 'includes a second static guide rod 31' and other components, and the structures of the first static contact 3 and the second static contact 3 'are the same and are symmetrically arranged on a plane passing through the rotation center line of the contact support 21 except that the lengths of the first static guide rod 31 and the second static guide rod 31' are different, where the other components are a contact welding boss 313, a contact 32, an arc striking plate 33, a sampling terminal 34, a rivet 35, and the like. In this embodiment, the first stationary guide 31 is slightly shorter than the second stationary guide 31'. The first stationary guide bar 31 and the second stationary guide bar 31' are both bent plates, the first stationary guide bar 31 includes a first fixing plate 311 connected to the first power connection terminal, and another first contact mounting plate 312 for mounting the contact 32 and the tab 33, and the first fixing plate 311 and the first contact mounting plate 312 form a certain angle; the second stationary guide bar 31' includes a second fixing plate 311' connected to the second power connection terminal, and a second contact mounting plate 312' for mounting the contact 32 and the tab 33, wherein the second fixing plate 311' and the second contact mounting plate 312' are at a certain angle. The first stationary contact 3 is different from the second stationary contact 3 'in that the first fixing plate 311 and the second fixing plate 311' have different lengths, and the first contact mounting plate 312 and the second contact mounting plate 312 'and the contacts 32, the arc striking plates 33, the sampling terminals 34, and the rivets 35 on the first stationary contact 3 and the second stationary contact 3' are all identical and are symmetrically arranged on a plane passing through the rotation center line of the contact support 21. Specifically, the first fixing plate 311 and the second fixing plate 311 'are disposed in parallel in the housing, so that the first contact mounting plate 312 and the second contact mounting plate 312' at one end of the two are both located at a side close to the movable contact 2 and close to each other. The contact 32 on the first fixed contact 3 and the contact 32 on the second fixed contact 3 'are respectively arranged on the surfaces of the first contact mounting plate 312 and the second contact mounting plate 312' which are deviated from each other, and are symmetrically arranged on a plane passing through the rotation center line of the contact support 21. The structure of other parts of the first stationary contact 3 and the second stationary contact 3' will be described below.

As shown in fig. 6 and 7, in the structure of the first stationary contact 3, in order to improve the welding firmness of the contact 32, a contact welding boss 313 is stamped at one end of the first contact mounting plate 312 of the first stationary guide bar 31, the thickness of the contact welding boss 313 is smaller than that of the first stationary guide bar 31, the contact 32 of the first stationary contact 3 is welded on the contact welding boss 313 of the first stationary guide bar 31, and this effect of improving the welding firmness of the contact 32 by adding the contact welding boss 313 is more obvious on a large-size switch. In the direction of the first contact mounting plate 312 of the first stationary guide bar 31 away from the contact 32, the arc tab 33 of the first stationary contact 3 passes through the through hole 331 of the arc tab 33 through the rivet 35 and then penetrates into the first rivet hole 3121 of the first contact mounting plate 312, so as to realize the fixed connection between the arc tab 33 and the first stationary guide bar 31, and the arc tab 33 and the contact 32 are spaced by a certain distance, which is 2mm to 3mm, generally about 2 mm. The tail of the arc striking piece 33 of the first fixed contact 3 is tilted to be close to the first arc extinguishing device 4. The sampling terminal 34 of the first stationary contact 3 is riveted to the back of the first stationary guide 31 through a first boss 3111 on the back of the first stationary guide 31.

Similarly, as shown in fig. 8 and 9, a contact welding boss 313 is stamped at one end of the second contact mounting plate 312' of the second stationary guide bar 31', the thickness of the contact welding boss 313 is smaller than that of the second stationary guide bar 31', and the contact 32 of the second stationary contact 3' is welded on the contact welding boss 313 of the second stationary guide bar 31 '. In the direction away from the contact 32 of the second contact mounting plate 312 'of the second stationary guide bar 31', the tab 33 of the second stationary contact 3 'passes through the through hole 331 of the tab 33 through the rivet 35 and then penetrates into the second rivet hole 3121' of the second contact mounting plate 312', so as to realize the fixed connection between the tab 33 and the second stationary guide bar 31', and the tab 33 and the contact 32 are spaced by a certain distance, which is 2mm to 3mm, generally about 2 mm. The tail of the arc striking plate 33 of the second fixed contact 3 'is tilted to be close to the second arc extinguishing device 4'. The sampling terminal 34 of the second stationary contact 3 'is riveted to the back surface of the second stationary guide 31' by a second boss 3111 'on the back surface of the second stationary guide 31'.

As shown in fig. 2, 4, 5, and 10, the dual power transfer switch further includes a first arc-extinguishing device 4 and a second arc-extinguishing device 4 'disposed in the housing, the first arc-extinguishing device 4 and the second arc-extinguishing device 4' respectively correspond to the contact 32 of the first stationary contact 3 and the contact 32 of the second stationary contact 3', the first arc-extinguishing device 4 and the second arc-extinguishing device 4' both include a plurality of arc-extinguishing bars 41 disposed at intervals, side spacers 42 disposed at both sides of the plurality of arc-extinguishing bars 41 and parallel to the arrangement direction of the plurality of arc-extinguishing bars 41, and a spacer 43 for spacing the bar legs 412 of each arc-extinguishing bar 41, the two sides of each arc-extinguishing bar 41 facing the side spacers 42 are provided with bar bosses 411, the side spacers 42 are provided with bar boss receptacles 421 and spacer boss receptacles 422, the spacer 43 is provided with ribs 431 and spacer bosses 432, the multiple arc-extinguishing bars 41 penetrate through the grid lug boss insertion holes 421 on the side partition plates 42 at two sides through the grid lug bosses 411 and are firmly riveted, the partition plate 43 penetrates through the partition plate lug boss insertion holes 422 on the side partition plates 42 through the partition plate lug bosses 432 and is firmly riveted, the ribs 431 are inserted into the grid leg 412 of each arc-extinguishing bar 41 to enable the grid leg 412 to keep a certain distance, the side partition plates 42 are further provided with grooves 423, and the grooves 423 are matched with the first arc-extinguishing device matching bosses 1061 or the second arc-extinguishing device matching bosses 1071 on the shell and are used for installing and positioning the first arc-extinguishing device 4 or the second arc-extinguishing device 4'. As shown in fig. 2, 4 and 5, the partition plates 5 are disposed at exhaust ports of the first arc extinguishing device 4 or the second arc extinguishing device 4', a plurality of small holes are formed in the surfaces of the partition plates 5, the partition plates 5 are made of cold-rolled steel sheets, which is beneficial to extinguishing electric arcs in the first arc extinguishing device 4 and the second arc extinguishing device 4', and the plurality of partition plates 5 can block the housing of the metal particle ejection breaking unit to prevent the metal particles from affecting the outside.

As shown in fig. 15, both ends of the movable guide 22 respectively extend out of the outer circumferential surface of the contact support 21, and the first movable contact 23 and the second movable contact 24 fixed to both ends of the movable guide 22 are symmetrically disposed on both sides of the rotation center of the contact support 21. As shown in fig. 5, the flexible connection 6 includes a contact connection conductor 61 and a terminal connection conductor 62 connected to each other, wherein the other end of the contact connection conductor 61 is connected to the movable contact 2, and the other end of the terminal connection conductor 62 is connected to the load-side connection terminal 7. The end of the contact connecting conductor 61 is connected to the middle of the movable guide rod 22. The utility model discloses the biggest innovation part is: a contact pressure compensation structure 8 is arranged in the shell, when the movable contact 2 is contacted with the first fixed contact 3, the contact pressure compensation structure 8 enables the current to generate an electrodynamic force capable of enabling the movable contact 2 to deflect towards the direction of the first fixed contact 3 on a contact connecting conductor 61 of the flexible connection 6; when the movable contact 2 is in contact with the second stationary contact 3', the pressure compensation structure 8 causes the current to generate an electromotive force on the contact connecting conductor 61 of the flexible connection 6, which can deflect the movable contact 2 toward the second stationary contact 3'. The contact pressure compensation structure 8 comprises a first blocking portion 81 and a second blocking portion 82 which are arranged in a housing, when the movable contact 2 is in contact with the first fixed contact 3, the flexible connection 6 is blocked by the first blocking portion 81 to generate shape change, the flexible connection 6 is in a first notch shape with an opening spreading to two sides, and the contact connecting conductor 61 and the terminal connecting conductor 62 on the flexible connection 6 respectively form two opposite sides of the notch shape; when the moving contact 2 contacts with the second stationary contact 3', the flexible connection 6 is blocked by the second blocking portion 82 to generate a shape change, the flexible connection 6 is in a second notch shape with an opening spreading to two sides, and the contact connecting conductor 61 and the terminal connecting conductor 62 on the flexible connection 6 respectively form two opposite sides of the notch shape. When the moving contact 2 contacts the first fixed contact 3, the current flows through the flexible connection 6, and since the first blocking portion 81 limits the terminal connection conductor 62, the current forms a force as shown in fig. 5 on the whole notch-shaped flexible connection 6, the force makes the terminal connection conductor 62 close to the load-side terminal connection 7 tightly attached to the first blocking portion 81, and the contact connection conductor 61 close to the moving contact 2 outwardly forms a tension favorable for increasing the contact pressure at the closing position, that is, a force for deflecting the moving contact 2 towards the first fixed contact 3 is increased, thereby realizing the electrodynamic compensation of the contact pressure. When the movable contact 2 contacts the second fixed contact 3', similarly, the second blocking portion 82 limits the terminal connection conductor 62, and the limiting manner and the manner of increasing the contact pressure at the closing position are the same as those described above when the movable contact 2 contacts the first fixed contact 3, and are not described herein again. The first blocking portion 81 and the second blocking portion 82 are symmetrically arranged corresponding to the two sides of the rotation center of the movable contact 2, so that when the movable contact 2 is in contact with the first fixed contact 3, the flexible connection 6 is in a first notch shape formed under the blocking and limiting of the first blocking portion 81, and when the second fixed contact 3' of the movable contact 2 is in contact, the flexible connection 6 is in a second notch shape formed under the blocking and limiting of the second blocking portion 82, the two notches are approximately symmetrical, the openings of the two notches are opposite, and the bottoms of the two notches are far away from each other. The first stop 81 or the second stop 82 is shaped such that the notch-like opening is as small as possible, the angular range of the notch (the angle between the terminal connection conductor 62 and the contact connection conductor 61) being 60 ° to 90 °.

As shown in fig. 3 to 5, a movable contact accommodating cavity 108 for accommodating the movable contact 2 and the flexible connection 6 is arranged inside the housing, the first blocking portion 81 and the second blocking portion 82 are two blocking surfaces formed by two cavity walls of the movable contact accommodating cavity 108, and a distance between the two cavity walls is gradually reduced from a position close to the movable contact 2 to a position close to the load-side terminal 7. The first blocking portion 81 and the second blocking portion 82 may be flat blocking surfaces formed by flat plates, or may be: the end of the first blocking portion 81 close to the movable contact 2 is bent to form a first blocking extension 811, and the end of the second blocking portion 82 close to the movable contact 2 is bent to form a second blocking extension 821, so that the first blocking portion 81 integrally presents an obtuse-angle bent blocking surface, and the second blocking portion 82 integrally presents an obtuse-angle bent blocking surface. The arrangement is used for limiting the notch-shaped bottom of the flexible connection 6, and is favorable for further increasing the tension of pressure increase of the contact at the closing position. Of course, the first blocking portion 81 and the second blocking portion 82 bent at the obtuse angle may also be formed by discontinuous blocking protrusions, for example, the first blocking extension 811 is separately disposed on the first blocking portion 81, the first blocking extension 811 is a blocking protrusion formed in the movable contact accommodating cavity 108, the first blocking portion 81 is another blocking protrusion formed in the movable contact accommodating cavity 108, the distance between the two blocking protrusions is 1cm, and the distance between the first blocking portion 81 and the cavity wall of the movable contact accommodating cavity 108 near the end of the load side terminal 7 may also be 1 cm. Thus, the first blocking portion 81 and the second blocking portion 82 may be provided as a continuous surface, or may be formed by a plurality of discontinuous blocking protrusions arranged inside the housing.

As shown in fig. 12a, 12b, 14 and 15, the contact support 21 rotates in a first direction to drive the movable guide 22 to rotate to contact with the first stationary contact 3, and the contact support 21 rotates in a second direction opposite to the first direction to drive the movable guide 22 to rotate to contact with the second stationary contact 3'. Two sides of the movable guide rod 22 near the middle are respectively provided with a guide rod groove 221 for matching with the spring assembly 25. One end of the flexible connection 6 is welded on the middle part of the movable guide rod 22, and the other end of the flexible connection 6 is welded on the bending part of the load side terminal 7, so that the movable guide rod 22 is electrically connected with the load side terminal 7.

As shown in fig. 15, the contact holder 21 includes a first contact holder 211 and a second contact holder 212, and the first contact holder 211 and the second contact holder 212 are both cylinders having openings and are assembled together to form a whole cylinder, and then are fixed together by screws. The first contact support 211 and the second contact support 212 are assembled to form a cavity 50 containing a part of the structure of the actuating guide rod 22, the spring assembly 25 and the like.

As shown in fig. 16 and 17, the first contact support 211 is provided with a cylindrical boss 2111, a first fulcrum first 2112, a second fulcrum first 2112', a first contact first groove 2113, a first contact second groove 2114, a first limit opening 2115, a first limit groove 2116, and a first sliding surface 2118. The second contact support 212 is provided with a cylindrical groove 2121, a first fulcrum two 2122, a second fulcrum two 2122', a second contact first groove 2123, a second contact second groove 2124, a second limiting opening 2125, a second limiting groove 2126, and a second sliding surface 2128. The second contact first groove 2123 is provided with a hanging shaft through hole 21231. The cylindrical boss 2111 is inserted into the cylindrical recess 2121, so that the consistency of the relative rotation directions of the first contact support 211 and the second contact support 212 is ensured.

As shown in fig. 15 and 18, the spring assembly 25 includes two pairs of spring pairs, which are a first spring pair 251 for making the movable contact 2 approach the first stationary contact 3 and a second spring pair 251 'for making the movable contact 2 approach the second stationary contact 3', each pair of spring pairs includes a shaft 2511 and two tension springs 2512, two ends of the shaft 2511 are respectively provided with a groove 25111, one end drag hook 25121 of the two tension springs 2512 is respectively sleeved on the groove 25111 of the shaft 2511, the shaft 2511 is installed in the guide bar groove 221 of the movable guide bar 22, the other end drag hook 25122 of the two tension springs 2512 is matched with the hanging shaft 26, and the hanging shaft 26 is installed on the contact support 21.

As shown in fig. 15-18, the first contact first notch 2113 and the second contact first notch 2123 are used for initial positioning against the shaft 26 when the spring assembly 25 is installed, and the first contact second notch 2114 and the second contact second notch 2124 are used for final positioning against the shaft 26 when the spring assembly 25 is installed. The first fulcrum i 2112, the second fulcrum i 2112 ', the first fulcrum ii 2122 and the second fulcrum ii 2122' are used for mounting the fulcrum of the movable guide rod 22, specifically, after the first contact support 211 and the second contact support 212 are assembled, the first fulcrum i 2112 and the second fulcrum ii 2122 are assembled to form the first fulcrum 30, and the second fulcrum i 2112 'and the second fulcrum ii 2122' are assembled to form the second fulcrum 40. The first limiting opening 2115 and the second limiting opening 2125 form a limiting groove for limiting the phase-to-phase flexible connection 6, and the welding root of the phase-to-phase flexible connection 6 and the movable guide rod 22 is prevented from being repeatedly twisted and broken. When the first contact holder 211 and the second contact holder 212 are combined together, a first sliding groove 501 for the rotation of the movable guide 22 is formed between the first sliding surface 2118 and the second sliding surface 2128 adjacent to the first movable contact 23, and a second sliding groove 502 for the rotation of the movable guide 22 is formed between the first sliding surface 2118 and the second sliding surface 2128 adjacent to the second movable contact 24. The two ends of the movable guide rod 22 slide in the first sliding groove 501 and the second sliding groove 502 respectively and extend out of the outer circumferential surface of the contact support 21. Here, the first fulcrum 30 and the first fulcrum 40 are groove walls of the second sliding groove 502 and the first sliding groove 501, respectively. The cover 27 is provided with a buckle 271 and a cover protrusion 272, the buckle 271 is matched with the first limiting groove 2116 or the second limiting groove 2126, and the cover protrusion 272 is matched with the first contact first groove 2113, the first contact second groove 2114, the second contact first groove 2123 and the second contact second groove 2124.

As shown in fig. 11, the dual power supply changeover switch further includes an operating mechanism 60, and the operating mechanism 60, the N-pole dividing unit 20, and the phase-pole dividing unit 10 are arranged side by side in sequence. One end of the contact support 21 of the N-pole breaking unit 20 is in transmission connection with the operating mechanism 60, and the other end of the contact support 21 of the phase-pole breaking unit 10 is in transmission connection with the operating mechanism 60, so that the contact support 21 of the N-pole breaking unit 20 and the contact support 21 of the phase-pole breaking unit 10 are driven to synchronously rotate through the operating mechanism 60.

As shown in fig. 12a, 12b and 15, the outer side surfaces of the first contact support 211 and the second contact support 212 are respectively provided with a driving groove 2119 and a driving boss 2129, and the movable contact 2 of the N-pole dividing unit 20, the movable contact 2 of the adjacent phase-pole dividing unit 10 and the movable contacts 2 of the two adjacent phase-pole dividing units 10 realize synchronous rotation through the fitting of the driving groove 2119 and the driving boss 2129 on the respective contact support 21.

As shown in fig. 13a, 13b, 19a, and 19b, after the movable contact 2 is just in contact with the first stationary contact 3, the contact support 21 continues to rotate around its own rotation center, and during this rotation, the relative rotation center of the movable guide 22 is the first fulcrum 30; as shown in fig. 23a and 23b, after the movable contact 2 is in contact with the second stationary contact 3', the contact support 21 continues to rotate around its own rotation center, and during the rotation process, the relative rotation center of the movable guide rod 22 is the second fulcrum 40; when the movable contact 2 is disconnected from the first stationary contact 3 and the second stationary contact 3', the movable guide 22 rotates around the rotation center along with the contact support 21.

As shown in fig. 12a to 17, the phase pole dividing unit 10 and the N pole dividing unit 20 are different in that: a support plate 28 is arranged between the movable guide rod 22 and the contact support 21 in the movable contact 2 of the phase pole breaking unit 10, and the movable guide rod 22, the support plate 28 and the contact support 21 of the phase pole breaking unit 10 are sequentially supported and pressed by pressure provided by the spring assembly 25. The moving contact 2 of the N-pole breaking unit 20 has no abutting plate 28 between the moving guide rod 22 and the contact support 21, and the moving guide rod 22 and the contact support 21 of the N-pole breaking unit 20 are directly abutted by the pressure provided by the spring assembly 25. Two abutting plates 28 are symmetrically arranged on the movable guide rod 22 of the phase pole dividing unit 10 at positions corresponding to the first fulcrum 30 and the second fulcrum 40, and the abutting plates 28 are U-shaped parts. The outer circular arc 281 of the U-shaped bottom of the abutting plate 28 is used for abutting against the first fulcrum 30 or the second fulcrum 40. The U-shaped inner channel 282 of the abutment plate 28 surrounds the movable guide bar 22. A buckle 283 is arranged at the opening of the U-shaped structure of the leaning plate 28 in an inward extending manner, and the buckle 283 is matched with the movable guide rod 22 in a clamping manner.

As shown in fig. 12a, 13a, and 14 to 18, the assembling process of the phase pole dividing unit 10 is: the abutting plate 28 is firstly buckled at two ends of the movable guide rod 22, then the shaft 2511 of the spring assembly 25 is hung on the guide rod groove 221 of the movable guide rod 22, the moving guide 22 is then placed between the first contact support 211 and the second contact support 212, while the flexible connection 6 is placed in the first retaining opening 2115 of the first contact support 211 and the second retaining opening 2125 of the second contact support 212, the arc surfaces 281 of the two support plates 28 are respectively supported on the first supporting point 30 and the second supporting point 40, and then the hanging shaft 26 passes through the hanging shaft through hole 21231 of the second contact support 212 and the second draw hook 25122 of the spring assembly 25 to initially position the spring assembly 25, then, the engaging shaft 26 is pulled to transfer from the first contact first groove 2113 and the second contact first groove 2123 to the first contact second groove 2114 and the second contact second groove 2124, respectively, so as to complete the final positioning of the spring assembly 25, and finally, the first contact support 211 and the second contact support 212 are fixed by screws to form the contact support 21 as a whole.

As shown in fig. 12a, 13a, and 14 to 18, the assembling process of the N-pole dividing unit 20 is: the shaft 2511 of the spring assembly 25 is hung against the guide bar groove 221 of the movable guide bar 22, the moving guide 22 is then placed between the first contact support 211 and the second contact support 212, while the flexible connection 6 is placed in the first retaining opening 2115 of the first contact support 211 and the second retaining opening 2125 of the second contact support 212, the movable guide rod 22 directly abuts against the first fulcrum 30 and the second fulcrum 40, and then the hanging shaft 26 passes through the hanging shaft through hole 21231 of the second contact support 212 and the second draw hook 25122 of the spring assembly 25 to initially position the spring assembly 25, then, the engaging shaft 26 is pulled to transfer from the first contact first groove 2113 and the second contact first groove 2123 to the first contact second groove 2114 and the second contact second groove 2124, respectively, so as to complete the final positioning of the spring assembly 25, and finally, the first contact support 211 and the second contact support 212 are fixed by screws to form the contact support 21 as a whole.

As shown in fig. 19a to 25b, the action process of the dual power transfer switch is as follows: when the dual power supply change-over switch is switched from the first power supply to the second power supply, the N-pole breaking unit 20 disconnects the first power supply N line later than the phase-pole breaking unit 10 disconnects the first power supply phase line, and the N-pole breaking unit 20 connects the second power supply N line earlier than the phase-pole breaking unit 10 connects the second power supply phase line. When the dual-power transfer switch is switched from the second power supply to the first power supply, the N-pole breaking unit 20 disconnects the second power supply N line later than the phase-pole breaking unit 10 disconnects the second power supply phase line, and the N-pole breaking unit 20 disconnects the first power supply N line earlier than the phase-pole breaking unit 10 disconnects the first power supply phase line.

As shown in fig. 19a and 19b, when the dual power transfer switch is located at the first working position, the movable contact 2 of the phase electrode dividing unit 10 contacts the first fixed contact 3 of the phase electrode dividing unit 10, and the movable contact 2 of the N electrode dividing unit 20 contacts the first fixed contact 3 of the N electrode dividing unit 20, so that the first power supply of the dual power transfer switch is turned on, and the second power supply is turned off.

As shown in fig. 20a and 20b, when the dual power supply changeover switch operates from the first operating position to the second operating position, when the contact supports 21 of the phase dividing unit 10 and the N-pole dividing unit 20 rotate together around the rotation center in a counterclockwise synchronous manner by a certain angle, due to the absence of the abutting plate 28 in the N-pole dividing unit 20, at the moment that the first movable contact 23 on the movable guide rod 22 of the phase dividing unit 10 is separated from the first fixed contact 3 of the phase dividing unit 10, the movable contact 2 in the N-pole dividing unit 20 is still in contact with the first fixed contact 3 of the N-pole dividing unit 20, and the N-pole dividing unit 20 disconnects the first power supply N line later than the phase dividing unit 10 to disconnect the first power supply phase line.

As shown in fig. 21a and 21b, when the dual power supply changeover switch continues to operate from the first operating position to the second operating position, when the contact supports 21 of both the phase electrode breaking unit 10 and the N electrode breaking unit 20 rotate together around the rotation center counterclockwise by a certain angle, the contact support 21 of the phase electrode breaking unit 10 drives the movable guide rod 22 of the phase electrode breaking unit 10 to continue to rotate, the contact support 21 of the N electrode breaking unit 20 drives the movable guide rod 22 of the N electrode breaking unit 20 to separate the first movable contact 23 on the movable guide rod 22 from the first fixed contact 3 of the N electrode breaking unit 20, and at this time, both the N electrode breaking unit 20 and the phase electrode breaking unit 10 disconnect the first power supply.

As shown in fig. 22a and 22b, when the dual power supply changeover switch continues to operate from the first operating position to the second operating position, the contact supports 21 of the phase dividing unit 10 and the N-pole dividing unit 20 rotate together around the rotation center counterclockwise by a certain angle, since the N-pole dividing unit 20 does not have the abutting plate 28, the second movable contact 24 on the movable guide rod 22 of the N-pole dividing unit 20 contacts the second fixed contact 3 'of the N-pole dividing unit 20 first, and at this time, the movable guide rod 22 of the phase dividing unit 10 does not rotate to the contact position of the second movable contact 24 and the second fixed contact 3' of the phase dividing unit 10, so that the N-pole dividing unit 20 connects the second power supply N line earlier than the phase dividing unit 10 connects the second power supply phase line.

As shown in fig. 23a and 23b, when the contact supports 21 of both the phase electrode breaking unit 10 and the N electrode breaking unit 20 rotate together around the rotation center counterclockwise by a certain angle, the dual power supply changeover switch reaches the second working position, during the rotation process at this stage, along with the rotation of the contact supports 21 of both the phase electrode breaking unit 10 and the N electrode breaking unit 20, the movable guide rods 22 of both the phase electrode breaking unit 10 and the N electrode breaking unit 20 are separated from the first support points 30, the rotation centers of the movable guide rods 22 are the second support points 40, the second movable contact 24 of the N electrode breaking unit 20 is kept in contact with the second fixed contact 3 'of the N electrode breaking unit 20, after the movable guide rods 22 of the phase electrode breaking unit 10 rotate around the second support points 40, the second movable contact 24 is in contact with the second fixed contact 3' of the phase electrode breaking unit 10, and finally, both the N electrode breaking unit 20 and the phase electrode breaking unit 10 are in contact with the second power supply, therefore, the second power supply of the dual-power transfer switch is switched on, and the first power supply is switched off.

As shown in fig. 24a and 24b, when the dual power transfer switch operates from the second working position to the first working position, the contact supports 21 of the phase dividing unit 10 and the N-pole dividing unit 20 rotate together around the rotation center in a counterclockwise synchronous manner by a certain angle, because there is no abutting plate 28 in the N-pole dividing unit 20, at the moment that the second movable contact 24 on the movable guide rod 22 of the phase dividing unit 10 is separated from the second stationary contact 3 'of the phase dividing unit 10, the movable contact 2 in the N-pole dividing unit 20 is still in contact with the second stationary contact 3' of the N-pole dividing unit 20, and the N-pole dividing unit 20 disconnects the second power source N line later than the phase dividing unit 10 to disconnect the second power source phase line.

As shown in fig. 25a and 25b, when the dual power supply changeover switch continues to operate from the second operating position to the first operating position, when the contact supports 21 of both the phase electrode breaking unit 10 and the N electrode breaking unit 20 rotate clockwise around the rotation center by a certain angle, the contact support 21 of the phase electrode breaking unit 10 drives the movable guide rod 22 of the phase electrode breaking unit 10 to continue to rotate, the contact support 21 of the N electrode breaking unit 20 drives the movable guide rod 22 of the N electrode breaking unit 20 to separate the second movable contact 24 on the movable guide rod 22 from the second fixed contact 3' of the N electrode breaking unit 20, and at this time, the N electrode breaking unit 20 and the phase electrode breaking unit 10 simultaneously disconnect the second power supply.

As shown in fig. 26a and 26b, when the dual power supply changeover switch continues to operate from the second operating position to the first operating position, the contact supports 21 of the phase dividing unit 10 and the N-pole dividing unit 20 rotate together clockwise around the rotation center for a certain angle, because the N-pole dividing unit 20 does not have the abutting plate 28, the first movable contact 23 on the movable guide rod 22 of the N-pole dividing unit 20 contacts the first fixed contact 3 of the N-pole dividing unit 20 first, and at this time, the movable guide rod 22 of the phase dividing unit 10 does not rotate to the position where the first movable contact 23 of the phase dividing unit 10 contacts the first fixed contact 3, so that the N-pole dividing unit 20 connects the first power supply N line earlier than the phase dividing unit 10 connects the first power supply phase line.

As shown in fig. 19a and 19b, when the contact supports 21 of the phase pole dividing unit 10 and the N pole dividing unit 20 rotate together around the rotation center counterclockwise by a certain angle, in the rotation process at this stage, along with the rotation of the contact supports 21 of the phase pole dividing unit 10 and the N pole dividing unit 20, the movable guide rods 22 of the phase pole dividing unit 10 and the N pole dividing unit 20 are both separated from the second supporting points 40, the rotation centers of the movable guide rods 22 are both the first supporting points 30, the first movable contact 23 of the N pole dividing unit 20 is kept in contact with the first fixed contact 3 of the N pole dividing unit 20, the movable guide rod 22 of the phase pole dividing unit 10 rotates around the first supporting points 30, the first movable contact 23 is in contact with the phase pole dividing unit 10 and the first fixed contact 3, and finally, the N pole dividing unit 20 and the phase pole dividing unit 10 are both in contact with the first power supply, so as to realize the first power supply connection of the transfer switch, the second power supply is disconnected.

Claims (12)

1. A dual-power transfer switch comprises one or more breaking units, each breaking unit comprises a shell, a movable contact (2) rotatably arranged in the shell, a first fixed contact (3) and a second fixed contact (3 ') fixed in the shell, a load side wiring terminal (7) fixed on the shell, and a flexible connection (6) with two ends respectively electrically connected with the movable contact (2) and the load side wiring terminal (7), the flexible connection (6) comprises a contact connection conductor (61) and a terminal connection conductor (62), the contact connection conductor (61) and the terminal connection conductor (62) are mutually connected and electrically connected with the movable contact (2) and the load side wiring terminal (7), when the movable contact (2) rotates to be in contact with the first fixed contact (3) in a first direction, the switch realizes the power supply of a first power supply, and when the movable contact (2) rotates to be in contact with the second fixed contact (3') in a second direction opposite to the first direction, the switch realizes the power supply of the second power supply, and is characterized in that: a contact pressure compensation structure (8) is arranged in the shell, and when the movable contact (2) is contacted with the first fixed contact (3), the direction of an electric force on a contact connecting conductor (61) of the flexible connection (6) is the direction of the movable contact (2) deflecting towards the first fixed contact (3) by the contact pressure compensation structure (8); when the movable contact (2) is contacted with the second fixed contact (3 '), the direction of the electric force on the contact connecting conductor (61) of the flexible connection (6) is the direction of the movable contact (2) deflecting towards the second fixed contact (3') by the pressure compensation structure (8).

2. The dual-power transfer switch of claim 1, wherein the contact pressure compensation structure (8) comprises a first stopper (81) and a second stopper (82) disposed in the housing, when the movable contact (2) contacts with the first stationary contact (3), the flexible connection (6) is blocked by the first stopper (81) to change its shape, the flexible connection (6) is in a first notch shape with an opening spreading to two sides, and the contact connection conductor (61) and the terminal connection conductor (62) on the flexible connection (6) respectively form two opposite sides of the notch shape; when the moving contact (2) is contacted with the second fixed contact (3'), the flexible connection (6) is blocked by the second blocking part (82) to generate shape change, the flexible connection (6) is in a second notch shape with an opening spreading to two sides, and the contact connecting conductor (61) and the terminal connecting conductor (62) on the flexible connection (6) respectively form two opposite side edges of the notch shape; the first notch-shaped opening and the second notch-shaped opening are opposite.

3. The dual-power transfer switch of claim 2, wherein the first stopper (81) limits the terminal connection conductor (62) when the movable contact (2) contacts the first fixed contact (3); when the moving contact (2) is contacted with the second fixed contact (3'), the second stopping part (82) limits the terminal connecting conductor (62).

4. The dual-power transfer switch according to claim 3, wherein a movable contact accommodating cavity (108) for accommodating the movable contact (2) and the flexible connection (6) is provided inside the housing, the first blocking portion (81) and the second blocking portion (82) are formed by two cavity walls of the movable contact accommodating cavity (108), and a distance between the two cavity walls is gradually reduced from a position close to the movable contact (2) to a position close to the load-side terminal (7).

5. The dual power transfer switch of claim 4, wherein the end of the first blocking portion (81) close to the movable contact (2) is bent to form a first blocking extension (811), and the end of the second blocking portion (82) close to the movable contact (2) is bent to form a second blocking extension (821), so that the first blocking portion (81) is bent at an obtuse angle and the second blocking portion (82) is bent at an obtuse angle.

6. The dual-power transfer switch of claim 1, wherein the movable contact (2) comprises a contact support (21) and a movable rod (22) driven by the contact support (21) to rotate, a first movable contact (23) and a second movable contact (24) are respectively fixed at two ends of the movable guide rod (22), a cavity (50) is arranged in the contact support (21), two ends of the cavity (50) extend to the outer circumferential surface of the contact support (21) to form a first sliding groove (501) and a second sliding groove (502), two ends of the movable guide rod (22) respectively slide in the first sliding groove (501) and the second sliding groove (502) and extend out of the outer circumferential surface of the contact support (21), the second sliding chute (502) and one end groove wall of the first sliding chute (501) form a first fulcrum (30) and a second fulcrum (40) against which the movable guide rod (22) directly or indirectly abuts.

7. The dual-power transfer switch of claim 6, wherein the first fixed contact (3) comprises a first fixed guide rod (31) and other components, the second fixed contact (3 ') comprises a second fixed guide rod (31 ') and other components, and the structures of the first fixed contact (3) and the second fixed contact (3 ') are the same except that the structures of the first fixed guide rod (31) and the second fixed guide rod (31 '), and the structures of the other components of the first fixed contact (3) and the other components of the second fixed contact (3 ') are symmetrically arranged on a plane passing through a rotation center line of the contact support (21); the other parts comprise contacts (32), the first static guide rod (31) comprises a first fixing plate (311) connected with a first power supply terminal, and the other part comprises a first contact mounting plate (312) used for mounting the contacts (32), a contact welding boss (313) is punched at one end of the first contact mounting plate (312) of the first static guide rod (31), the thickness of the contact welding boss (313) is smaller than that of the first static guide rod (31), the contacts (32) of the first static contact (3) are welded on the contact welding boss (313) of the first static guide rod (31), the second static guide rod (31 ') comprises a second fixing plate (311 ') connected with a second power supply terminal, the other part comprises a second contact mounting plate (312 ') used for mounting the contacts (32), and a contact welding boss (313) is punched at one end of the second contact mounting plate (312 ') of the second static guide rod (31 '), the thickness of the contact welding boss (313) is smaller than that of the second static guide rod (31 '), the contact (32) of the second static contact (3') is welded on the contact welding boss (313) of the second static guide rod (31 '), the first movable contact (23) is correspondingly matched with the contact (32) of the first static contact (3) in the rotating process of the movable guide rod (22), and the second movable contact (24) is correspondingly matched with the contact (32) of the second static contact (3').

8. The dual-power transfer switch of claim 7, further comprising a first arc extinguishing device (4) and a second arc extinguishing device (4 ') disposed in the housing, wherein the first arc extinguishing device (4) and the second arc extinguishing device (4') correspond to the contact (32) of the first fixed contact (3) and the contact (32) of the second fixed contact (3 '), respectively, the first arc extinguishing device (4) and the second arc extinguishing device (4') each comprise a plurality of arc extinguishing grids (41) disposed at intervals, side spacers (42) disposed at both sides of the plurality of arc extinguishing grids (41) and parallel to the arrangement direction of the plurality of arc extinguishing grids (41), and spacer members (43) for spacing the grid legs (412) of each arc extinguishing grid (41), and grid bosses (411) are disposed on both sides of each arc extinguishing grid (41) facing the side spacers (42), the side baffle plate (42) is provided with a grid lug boss insertion hole (421) and a baffle plate lug boss insertion hole (422), the clapboard part (43) is provided with ribs (431) and a clapboard part lug boss (432), the arc extinguishing grids (41) penetrate through the grid lug boss insertion holes (421) on the side partition plates (42) at two sides through the grid lug bosses (411) and then are firmly riveted, the partition plate (43) passes through the partition plate boss insertion hole (422) on the side partition plate (42) through the partition plate boss (432) and then is riveted, the ribs (431) are inserted into the grid legs (412) of each arc-extinguishing grid (41) to ensure that the grid legs (412) keep a certain distance, the side clapboard (42) is also provided with a groove (423), the groove (423) is matched with a first arc-extinguishing device matching boss (1061) or a second arc-extinguishing device matching boss (1071) on the shell, is used for installing and positioning the first arc extinguishing device (4) or the second arc extinguishing device (4').

9. The dual-power transfer switch of claim 8, wherein the other components further include an arc tab (33), a sampling terminal (34), and a rivet (35), the arc tab (33) is fixed to the first contact mounting plate (312) of the first stationary guide bar (31) by the rivet (35) at a position away from the contact (32), the arc tab (33) on the first stationary contact (3) is spaced from the contact (32) on the first stationary contact (3) by 2mm to 3mm, the tail of the arc tab (33) of the first stationary contact (3) is tilted to be close to the first arc extinguishing device (4), and the sampling terminal (34) on the first stationary contact (3) is riveted to the first stationary guide bar (31) by a first boss (3111) at the back of the first stationary guide bar (31); an arc striking plate (33) is fixed to a second contact mounting plate (312 ') of the second static guide rod (31') at a position away from the contact (32) by a rivet (35), the arc striking plate (33) on the second static contact (3 ') and the contact (32) on the second static contact (3') are spaced by 2mm to 3mm, the tail of the arc striking plate (33) of the second static contact (3 ') tilts to be close to the second arc extinguishing device (4'), and a sampling terminal (34) on the second static contact (3 ') is riveted to the second static guide rod (31') through a second boss (3111 ') on the back of the second static guide rod (31').

10. The dual-power transfer switch of claim 6, wherein the movable contact (2) comprises a spring assembly (25) for keeping the movable guide rod (22) against the contact support (21), the dividing unit is divided into a phase dividing unit (10) corresponding to a phase line of a power supply and an N-pole dividing unit (20) corresponding to an N-line of the power supply, and the phase dividing unit (10) and the N-pole dividing unit (20) are different in that: a support plate (28) is arranged between a movable guide rod (22) and a contact support (21) in a movable contact (2) of the phase pole breaking unit (10), the movable guide rod (22), the support plate (28) and the contact support (21) of the phase pole breaking unit (10) are sequentially supported and pressed through pressure provided by a spring assembly (25), the support plate (28) is not supported and pressed between the movable guide rod (22) and the contact support (21) in the movable contact (2) of the N pole breaking unit (20), and the movable guide rod (22) and the contact support (21) of the N pole breaking unit (20) are directly supported and pressed through the pressure provided by the spring assembly (25).

11. The dual-power transfer switch of claim 10, wherein the abutting plates (28) are a pair, and are symmetrically mounted on the movable guide rod (22) of the phase pole dividing unit (10) at positions corresponding to the first fulcrum (30) and the second fulcrum (40), the abutting plates (28) are U-shaped parts, an outer circular arc surface (281) at the bottom of the U-shaped structure of the abutting plates (28) is used for abutting against the first fulcrum (30) or the second fulcrum (40), a U-shaped inner groove (282) of the abutting plates (28) wraps the movable guide rod (22), a buckle (283) extends inwards from an opening of the U-shaped structure of the abutting plates (28), and the buckle (283) is in clamping fit with the movable guide rod (22).

12. The dual-power transfer switch of claim 11, wherein the dual-power transfer switch further comprises an operating mechanism (60), the N-pole breaking unit (20) and the phase breaking unit (10) are sequentially arranged side by side, one end of the contact support (21) of the N-pole breaking unit (20) is in transmission connection with the operating mechanism (60), the other end of the contact support (21) of the phase breaking unit (10) is in transmission connection with the operating mechanism (60), the contact support (21) of the N-pole breaking unit (20) and the contact support (21) of the phase breaking unit (10) are driven by the operating mechanism (60) to synchronously rotate, when the dual-power transfer switch is switched from a first power supply to a second power supply, the N-pole breaking unit (20) breaks a first power supply N line and breaks a first power supply phase line later than the phase breaking unit (10), the N-pole breaking unit (20) is connected with a second power supply N line earlier than the phase-pole breaking unit (10) is connected with a second power supply phase line; when the double-power-supply change-over switch is switched from the second power supply to the first power supply, the N-pole breaking unit (20) breaks the N line of the second power supply and breaks the phase line of the second power supply later than the phase-pole breaking unit (10), and the N-pole breaking unit (20) is connected with the N line of the first power supply and is connected with the phase line of the first power supply earlier than the phase-pole breaking unit (10).

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