CN111668036A

CN111668036A - Dual-power switching mechanism and transfer switch

Info

Publication number: CN111668036A
Application number: CN202010647337.7A
Authority: CN
Inventors: 李兵; 刘浩; 邢政; 左鉴波
Original assignee: Shaanxi Mingtuo Electromechanical Technology Co ltd
Current assignee: Shaanxi Mingtuo Electromechanical Technology Co ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2020-09-15
Also published as: WO2022007386A1

Abstract

The invention discloses a double-power-supply switching mechanism and a change-over switch. The dual-power switching mechanism comprises a cam, wherein at least two cam curved surfaces with different rotating radiuses are arranged on the cam; when the cam rotates, one of the pulleys makes linear motion close to the cam rotating shaft, and the other pulley makes linear motion far away from the cam rotating shaft; the input ends of the linkage structures are respectively connected to the pulleys, and the output ends of the linkage structures are respectively connected to the power switches; two defining an acting element. The pulleys are located at different positions in the linear motion to drive the linkage structure to move so as to realize the closing and breaking of the power switches, one pulley does linear motion close to the cam rotating shaft while the other pulley does linear motion far away from the cam rotating shaft, so that the two pulleys are ensured to perform linear motion in different directions, the linear motion in different directions corresponds to different closing and breaking states of the power switches, and the two power switches cannot be closed simultaneously.

Description

Dual-power switching mechanism and transfer switch

Technical Field

The invention relates to the technical field of electrical switches, in particular to a double-power-supply switching mechanism and a double-power-supply switching switch.

Background

The change-over switch is a low-voltage electrical appliance switch, is used in a power distribution system, and is used for selecting and changing and connecting one of two power supply sources to ensure that the output end of the switch continuously outputs electric energy.

The prior art discloses a change-over switch, which includes a power switch on the common side, a power switch on the standby side, a first transmission member, a second transmission member, a first electrical driving portion and a second electrical driving portion, wherein the first electrical driving portion drives the first transmission member to drive the power switch on the common side to be closed and disconnected, and the second electrical driving portion drives the second transmission member to drive the power switch on the standby side to be closed and disconnected.

However, in the above-mentioned transfer switch, the normal-side power switch and the standby-side power switch are driven by the independent electric driving part and the transmission member, respectively, and the sequential operations of first disconnecting the normal-side power switch and then disconnecting the standby-side power switch and then connecting the standby-side power switch are sequentially performed by the program control by feeding back the switch states by the position nodes of the power switches. If power switch position node has the mistake or when control program is chaotic, can be closed simultaneously with side switch commonly used and reserve side switch, the condition of two way power short circuits appears, and damages whole distribution system, and this kind of change over switch's reliability is low.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to put an end to the risk of short circuit of two power supplies, improve the safety and reliability of the change-over switch and stabilize the power distribution system.

A dual power transfer mechanism comprising:

the cam is provided with at least two cam curved surfaces with different rotating radiuses;

the two pulleys are supported on the curved surface of the cam, and when the cam rotates, one pulley does linear motion close to the rotating shaft of the cam along with the difference of the curved surface of the cam, and the other pulley does linear motion far away from the rotating shaft of the cam;

the input ends of the linkage structures are respectively connected to the pulleys, the output ends of the linkage structures are respectively connected to the power switch, and the power switch is driven to be closed and disconnected by the linear motion of the pulleys;

two limiting action pieces limiting the pulley to slide along the cam curved surface.

Further, when the cam is at rest, the pulleys are respectively supported by the cam curved surfaces with different rotating radiuses.

Further, when the cam rotates, the two pulleys do not move away from/close to the cam rotating shaft at the same time.

Further, the linkage structure swings.

Further, the device also comprises a driving structure, and the driving structure drives the cam to rotate and keep still.

Further, the driving structure comprises an electromagnetic driving structure, and the electromagnetic driving structure drives the cam to rotate.

Further, the driving structure further comprises a permanent magnet driving structure or a cam locking structure, and the permanent magnet driving structure or the cam locking structure drives the cam to keep still.

Further, the power switch is a vacuum switch.

Further, the power switch is an air switch.

A change-over switch comprises the double-power-supply change-over mechanism.

The technical scheme of the invention has the following advantages:

1. the invention provides a double power supply switching mechanism, comprising: the cam is provided with at least two cam curved surfaces with different rotating radiuses; the two pulleys are supported on the curved surface of the cam, and when the cam rotates, one pulley does linear motion close to the rotating shaft of the cam along with the difference of the curved surface of the cam, and the other pulley does linear motion far away from the rotating shaft of the cam; the input ends of the linkage structures are respectively connected to the pulleys, the output ends of the linkage structures are respectively connected to the power switch, and the power switch is driven to be closed and disconnected by the linear motion of the pulleys; two limiting action pieces limiting the pulley to slide along the cam curved surface. The double power supply conversion mechanism of the structure is characterized in that the closing and the breaking of the power supply switch are driven to be realized through cam rotation, pulley linear movement and linkage structure swing, because the curved surface of the cam has different rotation radiuses, the pulleys correspond to different positions in the linear motion at different rotation radiuses, namely, the pulleys correspond to the positions close to the rotating shaft of the cam in the linear motion when on the curved surface of the cam with a small rotation radius, and correspond to the positions far away from the rotating shaft of the cam in the linear motion when on the curved surface of the cam with a large rotation radius, the linkage structure is driven to move through the different positions of the pulleys in the linear motion to realize the closing and the breaking of the power supply switch, and because one pulley does the linear motion close to the rotating shaft of the cam and the other pulley does the linear motion far away from the rotating shaft of the cam, the two pulleys can be ensured to perform the linear motion in different directions, namely, one power switch is closed and the other power switch is disconnected, the two power switches cannot be closed, so that the conditions that two power supplies are short-circuited, the change-over switch is damaged, and potential safety hazards exist are avoided, and the reliability of the change-over switch is ensured.

2. According to the double-power-supply conversion mechanism, when the cam is static, the pulleys are respectively supported by the curved surfaces of the cams with different rotating radiuses. When the cam is static, the pulleys are respectively supported by the cam curved surfaces with different rotating radiuses, so that the pulleys are positioned at different positions in linear motion, namely one power switch is closed and the other power switch is disconnected, and the corresponding states of the two power switches are kept.

3. According to the dual power supply switching mechanism, when the cam rotates, the two pulleys do not move away from/close to the cam rotating shaft at the same time. In the double-power switching mechanism with the structure, the pulley which is farthest away from (or closest to) the cam rotating shaft moves firstly, and the corresponding switch is disconnected firstly; then the pulley closest to (or farthest from) the cam shaft moves and the corresponding switch closes again. The two power switches are sequentially closed and disconnected, so that the two power switches are ensured not to be closed under the condition of electric arcs.

4. According to the double-power-supply conversion mechanism, the driving structure comprises an electromagnetic driving structure, and the electromagnetic driving structure drives the cam to rotate. The double-power-supply switching mechanism with the structure is provided with the electromagnetic driving structure, so that when the power switch is driven, the contact of the power switch acts quickly, and the closing and the breaking of the power switch can be realized quickly.

5. The double-power-supply conversion mechanism comprises a driving structure, a permanent magnet driving structure or a cam locking structure, wherein the permanent magnet driving structure or the cam locking structure drives a cam to keep still. The dual-power switching mechanism with the structure is provided with the permanent magnet driving structure or the cam locking structure, wherein the permanent magnet driving structure keeps the static state of the cam by means of permanent magnetic force, the cam locking structure keeps the static state of the cam by means of locking of the mechanical structure, the cam locking structure does not depend on electromagnetic force, namely the state of the transfer switch is kept without continuously switching on the generated electromagnetic force, and energy is saved.

6. The invention discloses a double-power-supply switching mechanism, wherein a power switch is a vacuum switch. The double-power-supply switching mechanism with the structure has the advantages that the power switch is a vacuum switch, arc extinguishing time is not needed, so that the contact of the vacuum switch acts quickly, the action time of the contact can be shortened to be within 10ms, the switching time of the switching switch can be shortened to be within 20ms, the double-power-supply switching mechanism can be used for UPS uninterrupted power supplies, and the double-power-supply switching mechanism is directly suitable for severe loads such as computers and servers.

7. The transfer switch comprises the double-power transfer mechanism. The transfer switch with the structure has the advantages of the double-power transfer mechanism.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural view of a dual power supply changeover mechanism provided in embodiment 1 of the present invention;

fig. 2 is a schematic structural diagram of a common side power switch disconnection and a standby side power switch disconnection in the dual power switching mechanism shown in fig. 1;

fig. 3 is a schematic structural diagram of a common-side power switch disconnection and a standby-side power switch disconnection in the dual power switching mechanism shown in fig. 2;

FIG. 4 is a schematic structural diagram of a common-side power switch breaking and a standby-side power switch closing in the dual power transfer mechanism shown in FIG. 3;

fig. 5 is a schematic structural view of a dual power supply changeover mechanism provided in embodiment 2 of the present invention;

fig. 6 is a schematic structural diagram of a common side power switch disconnection and a standby side power switch disconnection in the dual power switching mechanism shown in fig. 5;

fig. 7 is a schematic structural diagram of a common side power switch disconnection and a standby side power switch disconnection in the dual power switching mechanism shown in fig. 6;

FIG. 8 is a schematic structural diagram of a normal-side power switch breaking and a standby-side power switch closing in the dual power transfer mechanism shown in FIG. 7;

fig. 9 is a schematic structural view of a dual power supply changeover mechanism provided in embodiment 3 of the present invention;

fig. 10 is a schematic structural diagram of a normal-side power switch disconnection and a standby-side power switch disconnection in the dual power transfer mechanism shown in fig. 9;

fig. 11 is a schematic structural diagram of a breaking state of a common-side power switch and a closing state of a standby-side power switch in the dual power switching mechanism shown in fig. 10;

description of reference numerals:

11-a common side power switch and 12-a standby side power switch;

2-cam, 21-first cam curved surface, 22-second cam curved surface;

311-a common side first swing connecting arm, 312-a common side second swing connecting arm, 32-a common side first connecting piece, 331-a standby side first swing connecting arm, 332-a standby side second swing connecting arm, 34-a standby side first connecting piece;

41-driving connecting piece, 42-closing coil, 43-closing iron core, 44-opening coil, 45-opening iron core, 46-permanent magnet, 47-first biasing piece;

51-a common-side second swinging member, 52-a common-side second connecting member, 53-a common-side third connecting member, 54-a spare-side second swinging member, 55-a spare-side second connecting member, 56-a spare-side third connecting member;

61-abutment wall, 62-electromagnetic coil, 63-second biasing member, 64-electromagnetic core, 65-linkage rod;

71-a common side fourth connecting piece, 72-a common side limiting sleeve, 73-a standby side fourth connecting piece and 74-a standby side limiting sleeve;

81-common side pulley, 82-standby side pulley;

91-the usual side limiting action, 92-the spare side limiting action.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a dual power switching mechanism as shown in fig. 1 to 4, which includes a cam 2, two pulleys, two interlocking structures, two limiting operators and a driving structure.

As shown in fig. 1 to 4, the cam 2 is rotatably connected to the first support, and the cam 2 is provided with at least two cam curved surfaces with different rotating radiuses, that is, the cam curved surfaces at least include a first cam curved surface 21 and a second cam curved surface 22, wherein the rotating radius of the first cam curved surface 21 is greater than the rotating radius of the second cam curved surface 22.

As shown in fig. 1 to 4, the two pulleys, i.e., the normal side pulley 81 and the standby side pulley 82, are supported on the cam curved surface, and when the cam 2 rotates, one of the pulleys first makes a linear motion away from the cam and the other pulley then makes a linear motion close to the cam according to the difference of the cam curved surface. When the cam 2 is static, the pulleys are respectively supported by the cam curved surfaces with different rotating radiuses; when the cam 2 rotates, the two pulleys do not move away from/close to the cam at the same time.

When the cam 2 is static, the pulleys are respectively supported by the cam curved surfaces with different rotating radiuses, so that the pulleys are positioned at different positions in linear motion, namely one power switch is closed and the other power switch is disconnected, and the corresponding states of the two power switches are kept. The pulley which is farthest away from (or closest to) the cam rotating shaft moves first, and the corresponding switch is switched off first; then the pulley closest to (or farthest from) the cam shaft moves and the corresponding switch closes again. The two power switches are sequentially closed and disconnected, so that the two power switches are ensured not to be closed under the condition of electric arcs.

As shown in fig. 1 to 4, the input ends of the linkage structures are rotatably connected to the pulleys, and the output ends of the linkage structures are fixedly connected to the moving contacts of the power switches, so that the power switches are driven to be closed and disconnected by the linear motion of the pulleys. Wherein the power switch in this embodiment is a vacuum switch. As shown in fig. 1 to 4, two power switches are provided, one of the power switches is a common-side power switch 11, and the other is a standby-side power switch 12, that is, in fig. 1 to 4, the power switch located at the upper side in the figure is the common-side power switch 11, the power switch located at the lower side in the figure is the standby-side power switch 12, and each power switch includes a moving contact and a stationary contact.

Because the power switch is a vacuum switch and has no arc extinguishing time, the contact of the vacuum switch acts quickly, the action time of the contact can be shortened to within 10ms, the switching time of the change-over switch can be shortened to within 20ms, and the UPS can be used in UPS and is directly suitable for severe loads such as computers, servers and the like.

Specifically, the linkage structure swings and is provided with two, which are a common side linkage structure and a standby side linkage structure respectively. As shown in fig. 1 to 4, the common-side link structure in the present embodiment includes a common-side first swinging member and a common-side first link member 32. The common side first swinging connecting arm 311 and the common side second swinging connecting arm 312 are arranged on the side part of the common side first swinging connecting arm 311, one end part of the common side first swinging connecting arm 311 is rotatably connected to the common side second support, the other end part of the common side first swinging connecting arm 311 is rotatably connected with the common side first connecting piece 32, the common side second swinging connecting arm 312 is arranged on the side part of the common side first swinging connecting arm 311, and the end part of the common side second swinging connecting arm 312 forms an input end which is rotatably connected to the common side pulley 81; the end of the common-side first connecting member 32 remote from the common-side first swinging connecting arm 311 forms a movable contact whose output end is fixedly connected to the common-side power switch 11.

As shown in fig. 1 to 4, the backup-side linkage structure in the present embodiment includes a backup-side first swinging member and a backup-side first link member 34. The standby side first swinging component comprises a standby side first swinging connecting arm 331 and a standby side second swinging connecting arm 332, one end part of the standby side first swinging connecting arm 331 is rotatably connected to the standby side second support, the other end part of the standby side first swinging connecting arm 331 is rotatably connected with the standby side first connecting element 34, the standby side second swinging connecting arm 332 is arranged at the side part of the standby side first swinging connecting arm 331, and the end part of the standby side second swinging connecting arm 332 is formed into an input end which is rotatably connected with the standby side pulley 82; the end of the backup-side first connecting member 34 remote from the backup-side first swinging connecting arm 331 forms a movable contact whose output end is fixedly connected to the backup-side power switch 12.

The two limiting function members in this embodiment are a normal side limiting function member 91 and a standby side limiting function member 92, respectively, which limit the corresponding pulleys to slide along the cam curved surface. Wherein both limiting actors can be tension springs. Referring specifically to fig. 1 to 4, one end of the common side restricting member 91 is fixed to the first support, and the other end of the common side restricting member 91 is fixed to the common side pulley 81; one end of the backup-side restricting member 92 is fixed to the first bracket, and the other end of the backup-side restricting member 92 is fixed to the backup-side pulley 82.

The driving structure in this embodiment drives the cam 2 to rotate, remaining stationary. As shown in fig. 1 to 4, the driving structure includes an electromagnetic driving structure and a permanent magnet driving structure, the electromagnetic driving structure drives the cam 2 to rotate, and the permanent magnet driving structure drives the cam 2 to remain stationary. Specifically, the electromagnetic driving structure includes a driving connection member 41, a closing coil 42, a closing iron core 43, an opening coil 44, an opening iron core 45, and an armature; the permanent magnet drive structure includes a permanent magnet 46 and a first biasing member 47.

Through being provided with electromagnetic drive structure, when drive switch for switch's contact action is fast, can realize switch's closure, breaking fast. By providing a permanent magnet driving structure that relies on permanent magnetic force to maintain the state of the cam 2 stationary, rather than on electromagnetic force, i.e., without having to continuously switch on to generate electromagnetic force to maintain the state of the transfer switch, energy is saved.

Wherein, the closing coil 42 is arranged around the closing iron core 43 to close the power switch at the common side; the opening coil 44 is arranged around the opening iron core 45 to enable the standby side power switch to be switched off; the driving link 41 may be fixed to the cam 2 by welding or bonding, etc.; the armature is arranged on one side of the driving connecting piece 41 close to the closing iron core 43 and corresponds to the closing iron core 43 and the opening iron core 45; the permanent magnet 46 makes the armature and the closing iron core 43 keep a joint state so as to close the common-side power switch 11 or the standby-side power switch 12, or the permanent magnet makes the armature and the closing iron core 43 keep a separation state so as to break the common-side power switch 11 or the standby-side power switch 12; the first biasing member 47 applies a biasing force to the driving link 41 to move in a direction away from the closing iron core 43 to move the armature away from the closing iron core 43 against the attractive force of the permanent magnet 46, wherein the first biasing member 47 may be a compression spring.

When the opening coil 44 is electrified to generate magnetic flux in a direction opposite to that of the permanent magnet 46 to counteract the attraction force of the permanent magnet 46 to the armature, the driving connecting piece 41 rotates clockwise under the action of the first biasing piece 47 to drive the cam 2 to rotate clockwise around the first support, the common side pulley 81 moves from the second cam curved surface 22 to the first cam curved surface 21, the common side pulley 81 drives the common side first swing connecting arm 311 to rotate clockwise around the common side second support, and the common side first swing connecting arm 311 drives the common side first connecting piece 32 to move towards a direction far away from the movable contact, so that the movable contact is far away from the fixed contact, and the breaking of the common side power switch 11 is realized; meanwhile, the standby side pulley 82 moves on the first cam curved surface 21 on the cam 2, so that the standby side pulley is kept static relative to the first support and the standby side power supply is kept disconnected;

then the driving connecting piece 41 continues to rotate clockwise around the first support, the common side pulley 81 moves on the first cam curved surface 21 on the cam 2, the common side pulley is kept static relative to the first support, and the common side power switch 11 is kept disconnected; meanwhile, the first cam curved surface 21 of the standby side pulley 82 on the cam 2 moves to the second cam curved surface 22 to drive the standby side first swing connecting arm 331 to rotate clockwise around the standby side second support, the standby side first swing connecting arm 331 pushes the standby side first connecting piece 34 to move towards the direction close to the static contact, so that the movable contact is close to the static contact, the standby side power switch 12 is closed, the driving connecting piece 41 is kept static under the action of the first biasing piece 47 after the movement is finished, the cam 2 is kept in a constant state, and the states of the common side power switch 11 and the standby side power switch 12 are kept constant.

When the closing coil 42 is energized, the armature on the driving connecting member 41 overcomes the elastic force of the first biasing member 47 to move downward under the resultant force of the electromagnetic force of the closing iron core 43 and the permanent magnetic force of the permanent magnet 46, drives the cam 2 to rotate counterclockwise around the first supporting seat, the movement of the common side pulley 81 and the standby side pulley 82 on the cam 2 drives the common side first swinging connecting arm 311 and the standby side first swinging connecting arm 331 to rotate anticlockwise around the common side second support and the standby side second support respectively, the standby side first connecting piece 34 moves away from the fixed contact and the common side first connecting piece 3232 moves close to the fixed contact, so that the standby side power switch 12 is firstly switched off, and then, the normal-side power switch 11 is closed again, after the movement is finished, the closing coil 42 is de-energized, and the armature keeps static under the combined force of the permanent magnet 46 and the first biasing member 47, so that the states of the normal-side power switch 11 and the standby-side power switch 12 are kept unchanged.

In this embodiment, a working process of the dual power supply switching mechanism:

in fig. 1, the normal-side power switch 11 is closed and the standby-side power switch 12 is opened. The drive connection member 41 is held stationary against the spring force of the first biasing member 47 by the armature and the permanent magnet 46.

In the process from fig. 1 to fig. 2 and fig. 2 to fig. 3, the opening coil 44 is closed to generate magnetic flux, so as to weaken the magnetic flux of the permanent magnet 46, the magnetic force is smaller than the elastic force of the first biasing member 47, the armature moves towards the direction away from the opening iron core 45 together with the driving connecting member 41, the cam 2 rotates clockwise around the first support, the common side pulley 81 moves from the second cam curved surface 22 to the first cam curved surface 21, the common side first swinging connecting arm 311 rotates clockwise around the common side second support, the common side first connecting member 32 drives the movable contact to be away from the fixed contact, so that the common side power switch 11 is disconnected, the standby side pulley 82 is kept stationary relative to the first support, and the standby side power switch 12 is disconnected.

In fig. 2 and 3, the normal-side power switch 11 is disconnected, and the standby-side power switch 12 is not closed, which is a transient state during the movement.

In the process from fig. 3 to fig. 4, the driving connecting member 41 continues to move away from the switching-off iron core 45 under the elastic force of the first biasing force, the cam 2 continues to rotate clockwise around the first support, the common-side pulley 81 is stationary relative to the first support, the common-side power switch 11 keeps being disconnected, the standby-side pulley 82 moves from the first cam curved surface 21 to the second cam curved surface 22, the standby-side first swing connecting arm 331 rotates clockwise around the standby-side second support, and the movable contact moves close to the fixed contact under the action of the standby-side first connecting member 34, so that the standby-side power switch 12 is closed.

In fig. 4, the normal-side power switch 11 is turned off and the standby-side power switch 12 is turned on, and the driving link 41 is held stationary by the first biasing member 47.

In the process from fig. 4 to fig. 3, the closing coil 42 is closed to generate magnetic flux, the magnetic flux of the permanent magnet 46 is enhanced, the magnetic force is greater than the elastic force of the first biasing member 47, the armature moves toward the direction close to the opening iron core 45 together with the driving plate, the cam 2 rotates counterclockwise around the first support, the standby side pulley 82 moves from the second cam curved surface 22 to the first cam curved surface 21, the standby side first swing connecting arm 331 rotates counterclockwise around the standby side second support, the standby side first connecting member 34 drives the moving contact to be away from the fixed contact, so that the standby side power switch 12 is switched off, the common side pulley 81 remains stationary relative to the first support, and the common side power switch 11 remains switched off.

In the process from fig. 3 to fig. 2, and fig. 2 to fig. 1, the cam 2 continues to rotate counterclockwise around the first support, the backup-side pulley 82 is stationary relative to the first support, the backup-side power switch 12 is kept disconnected, the common-side pulley 81 moves from the first cam curved surface 21 to the second cam curved surface 22, the common-side first swing connecting arm 311 rotates counterclockwise around the common-side second support, and the movable contact is close to the fixed contact under the action of the common-side first connecting member 32, so that the common-side power switch 11 is closed.

The invention relates to a double power supply conversion mechanism, wherein the closing and the breaking of a power supply switch are realized by the rotation of a cam 2, the linear movement of a pulley and the swinging of a linkage structure, because the curved surface of the cam has different rotation radiuses, the pulley corresponds to different positions in the linear movement at different rotation radiuses, namely the pulley corresponds to the position close to a cam rotating shaft in the linear movement when on the curved surface of the cam with a small rotation radius, and corresponds to the position far away from the cam rotating shaft in the linear movement when on the curved surface of the cam with a large rotation radius, the linkage structure is driven to move by the different positions of the pulley in the linear movement to realize the closing and the breaking of the power supply switch, and because one pulley does the linear movement close to the cam rotating shaft and the other pulley does the linear movement far away from the cam rotating shaft, the two pulleys are ensured to perform the linear movements in different directions, and the linear movements, namely, one power switch is closed and the other power switch is disconnected, the two power switches cannot be closed, so that the conditions that two power supplies are short-circuited, the change-over switch is damaged, and potential safety hazards exist are avoided, and the reliability of the change-over switch is ensured.

Example 2

The present embodiment provides a dual power supply switching mechanism as shown in fig. 5 to 8, which is different from embodiment 1 in that: the linkage structure and the driving structure are different.

As shown in fig. 5 to 8, the common side linkage structure in this embodiment includes a common side second swinging member 51, a common side second connecting member 52 and a common side third connecting member 53, the common side second swinging member 51 is rotatably connected to a common side third support, an input portion formed at an end portion of the common side second connecting member 52 close to the second cam curved surface 22 is rotatably connected to the pulley, the common side third connecting member 53 has a movable contact having an output portion fixedly connected to the common side power switch 11, the common side second connecting member 52 and the common side third connecting member 53 are rotatably connected to different end portions of a swinging fulcrum of the common side second swinging member 51, wherein the swinging fulcrum of the common side second swinging member 51 is a rotating connection portion of the common side second swinging member 51 and the third support.

As shown in fig. 5 to 8, the backup-side linkage structure in this embodiment includes a backup-side second swinging member 55, a backup-side second connecting member, and a backup-side third connecting member 56, the backup-side second swinging member 55 is rotatably connected to a backup-side third support, the backup-side second connecting member is adjacent to an end of the second cam curved surface 22 and forms an input portion, and is rotatably connected to the pulley, the backup-side third connecting member 56 has a movable contact whose output portion is fixedly connected to the backup-side power switch 12, and the backup-side second connecting member and the backup-side third connecting member 56 are rotatably connected to different end portions of a swinging fulcrum of the backup-side second swinging member 55, where the swinging fulcrum of the backup-side second swinging member 55 is a rotating connection portion of the backup-side second swinging member 55 and the third support.

The second swinging piece, the second connecting piece and the third connecting piece form a lever structure, and according to the lever principle, a swinging fulcrum of the second swinging piece is arranged close to the output end, so that the power switch is driven to be closed and disconnected by small force.

As shown in fig. 5 to 8, the driving structure in the present embodiment includes an electromagnetic driving structure that drives the cam 2 to be held stationary and a cam locking structure that drives the cam 2 to be held stationary. Wherein the electromagnetic drive structure includes an electromagnetic coil 62, an electromagnetic core 64 and a linkage rod 65, and the cam lock structure includes an abutment wall 61 and a second biasing member 63. Specifically, a second biasing member 63, such as a spring, is located between the abutment wall 61 and the electromagnet core 64, the electromagnet coil 62 is disposed around the electromagnet core 64, and both ends of the linkage rod 65 are rotatably connected to the electromagnet core 64 and the cam 2, respectively. Of course, the driving structure in embodiment 1 and the driving structure in embodiment 2 are interchangeable, and may not be provided but rotated by manually driving the cam 2.

The working process of the dual power supply switching mechanism in the embodiment is as follows:

(1) as shown in fig. 5, in the normal state, the electromagnetic coil 62 is de-energized, the power switch maintains the state of the power switch by virtue of the elastic force of the second biasing member 63 and other transmission structures, and the load output is supplied with power by the closing of the common side power switch 11;

(2) when the electromagnetic coil 62 is electrified, a magnetic field is generated, the electromagnetic force attracts the electromagnetic iron core 64 to move towards the center direction of the electromagnetic coil 62, the linkage rod 65 moves along with the electromagnetic coil and drives the cam 2 to rotate anticlockwise, the common side pulley 81 and the standby side pulley 82 move towards the direction close to and away from the first support respectively under the action of the tension spring force of the common side limiting action piece 91 and the standby side limiting action piece 92, namely move towards the second cam curved surface 22 and the first cam curved surface 21 respectively, and the common side power switch 11 moves towards the breaking motion and the standby side power switch 12 moves towards the closing motion under the driving of the common side linkage structure and the standby side linkage structure;

(3) as shown in fig. 6 and 7, a time when both the normal-side power switch 11 and the standby-side power switch 12 are switched off is provided when the cam is on the second cam curved surface 22;

(4) when the electromagnetic core 64 moves to the farthest end from the cam 2, the linkage rod 65 defines the position of the electromagnetic core 64 which continues to move away from the cam 2, and the cam 2 can shift over the symmetrical position under the inertia effect;

(5) as shown in fig. 8, when the electromagnetic coil 62 loses power and loses electromagnetic force, the compressed second biasing member 63 releases energy to push the electromagnetic iron core 64 to move towards the direction close to the cam 2, the linkage rod 65 continues to push the cam 2 to rotate anticlockwise, then the common-side linkage structure and the standby-side linkage structure respectively drive the common-side power switch 11 to be switched off and the standby-side power switch 12 to be switched on, and the load output is powered by the switching on of the standby-side power switch 12;

(6) the state of the power switch is maintained by the elastic force of the second biasing member 63;

(7) when the electromagnetic coil 62 is energized again, the above processes (1) to (6) are performed again, but the cam 2 rotates clockwise, so that the normal-side power switch 11 is closed, the standby-side power switch 12 is disconnected, and the load output is closed by the normal-side power switch 11 to supply power.

Example 3

The present embodiment provides a dual power supply switching mechanism as shown in fig. 9 to 11, which is different from embodiment 1 in that: the linkage structure and the power switch are different, and the driving structure is not arranged. Wherein, the power switch can be driven by the driving structure in embodiment 1 or embodiment 2, or can be manually driven to be closed or disconnected.

As shown in fig. 9 to 11, the power switch in the present embodiment is an air switch, and the switch contact connection may be a bridge type or a pointer type.

As shown in fig. 9 to 10, the common side linkage structure in this embodiment includes a common side fourth connecting member 71 and a common side limiting sleeve 72, wherein one end of the common side fourth connecting member 71 forms an input end rotatably connected to the common side pulley 81, and the other end forms a movable contact whose output end is fixedly connected to the common side switch.

As shown in fig. 9 to 10, the backup-side linkage structure in the present embodiment includes a backup-side fourth connecting member 73 and a backup-side limiting sleeve 74, wherein one end of the backup-side fourth connecting member 73 forms an input end rotatably connected to the backup-side pulley 82, and the other end forms an output end fixedly connected to the movable contact of the backup-side switch.

in fig. 9, the normal-side power switch 11 is closed and the standby-side power switch 12 is opened.

In the process from fig. 9 to fig. 10, the cam 2 rotates clockwise around the first support, the common side pulley 81 moves from the first cam curved surface 21 to the second cam curved surface 22, the common side fourth connecting member 71 drives the movable contact to be away from the fixed contact, so that the common side power switch 11 is disconnected, the standby side pulley 82 is kept stationary relative to the first support, and the standby side power switch 12 is disconnected.

In fig. 10, the normal-side power switch 11 is disconnected, and the standby-side power switch 12 is not closed, which is a transient state during the movement;

in the process from fig. 10 to fig. 11, the cam 2 continues to rotate clockwise around the first support, the common-side pulley 81 is stationary relative to the first support, the common-side power switch 11 keeps being disconnected, the standby-side pulley 82 moves from the second cam curved surface 22 to the first cam curved surface 21, and the movable contact moves close to the stationary contact under the action of the standby-side fourth connecting piece 73, so that the standby-side power switch 12 is closed.

In fig. 11, the normal-side power switch 11 is turned off, and the standby-side power switch 12 is turned on.

In the process from fig. 11 to fig. 10, the cam 2 rotates counterclockwise around the first support, the standby side pulley 82 moves from the first cam curved surface 21 to the second cam curved surface 22, the standby side fourth connecting member 73 drives the movable contact to be away from the fixed contact, so that the standby side power switch 12 is disconnected, the common side pulley 81 remains stationary relative to the first support, and the common side power switch 11 remains disconnected.

In the process from fig. 10 to fig. 9, the cam 2 continues to rotate counterclockwise around the first support, the standby-side pulley 82 is stationary relative to the first support, the standby-side power switch 12 keeps being disconnected, the common-side pulley 81 moves from the second cam curved surface 22 to the first cam curved surface 21, and the movable contact is close to the stationary contact under the action of the common-side fourth connecting piece 71, so that the common-side power switch 11 is closed.

Example 4

This embodiment provides a transfer switch including a dual power transfer mechanism as provided in any one of embodiments 1 to 3.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A dual power transfer mechanism, comprising:

2. The dual power switching mechanism as claimed in claim 1, wherein when the cam is at rest, the pulleys are respectively supported by the curved surfaces of the cam with different radii of rotation.

3. The dual power switching mechanism as claimed in claim 2, wherein when the cam rotates, the two pulleys do not move linearly away from/close to the cam shaft at the same time.

4. The dual power transfer mechanism of claim 1, wherein the linkage is arranged in a swinging manner.

5. The dual power transfer mechanism of any one of claims 1-4, further comprising a drive structure that drives the cam to rotate and remain stationary.

6. The dual power transfer mechanism of claim 5, wherein the drive structure comprises an electromagnetic drive structure that drives the cam in rotation.

7. The dual power transfer mechanism of claim 6, wherein the drive structure further comprises a permanent magnet drive structure or a cam lock structure that drives the cam to remain stationary.

8. The dual power supply switching mechanism of any one of claims 1-4, wherein the power switch is a vacuum switch.

9. The dual power supply switching mechanism of any one of claims 1-4, wherein the power switch is an air switch.

10. A transfer switch comprising the dual power transfer mechanism of any one of claims 1 to 9.