Dual power conversion mechanism and conversion switch

Abstract

The present invention discloses a dual power conversion mechanism and a conversion switch. The dual power conversion mechanism includes a cam, on which are provided at least two cam surfaces with different rotational radii; two pulleys, wherein when the cam rotates, one of the pulleys performs a linear motion close to the cam shaft and the other pulley performs a linear motion away from the cam shaft; two linkage structures, wherein the input ends of the linkage structures are respectively connected to the pulleys and the output ends are respectively connected to the power switch; and two limiting members. The linkage structures are driven to move by the pulleys at different positions in the linear motion to achieve the closing and disconnection of the power switch. When one pulley performs a linear motion close to the cam shaft and the other pulley performs a linear motion away from the cam shaft, the two pulleys are ensured to perform linear motion in different directions. The linear motions in different directions correspond to different closing and disconnecting states of the power switch, and the two power switches will not be closed at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical switches, and in particular to a dual power conversion mechanism and a conversion switch. Background Art

[0002] A transfer switch is a low-voltage electrical switch used in power distribution systems to select and transfer one of the two power supplies to ensure continuous power output at the switch output end.

[0003] The prior art discloses a transfer switch, which includes a normal side power switch, a standby side power switch, a first transmission member, a second transmission member, a first electrical drive unit and a second electrical drive unit. The first electrical drive unit drives the first transmission member to drive the normal side power switch to close and disconnect, and the second electrical drive unit drives the second transmission member to drive the standby side power switch to close and disconnect.

[0004] However, in the aforementioned transfer switch, the primary and backup power switches are driven by independent electrical drive units and transmission components. The sequential operation of the primary power switch opening first and then closing the backup power switch is controlled by a program, relying on the position nodes of the power switches to feedback the switch states. If the power switch position nodes are incorrect or the control program is disrupted, the primary and backup power switches could be closed simultaneously, short-circuiting the two power sources and damaging the entire power distribution system. This transfer switch has low reliability. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present invention is to eliminate the risk of short-circuiting of two power supplies, improve the safety and reliability of the transfer switch, and stabilize the power distribution system.

[0006] A dual power conversion mechanism, comprising:

[0007] A cam having at least two cam surfaces with different rotational radii;

[0008] Two pulleys are supported on the cam curved surface. When the cam rotates, one of the pulleys moves linearly toward the cam shaft and the other pulley moves linearly away from the cam shaft, depending on the difference in the cam curved surface.

[0009] Two linkage structures, 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, and the power switches are driven to be closed and opened through the linear motion of the pulleys;

[0010] Two limiting members limit the pulley to slide along the cam surface.

[0011] Furthermore, when the cam is stationary, the pulleys are supported by the cam curved surfaces with different rotational radii.

[0012] Furthermore, when the cam rotates, the two pulleys do not simultaneously perform linear motion away from / approaching the cam shaft.

[0013] Furthermore, the linkage structure is swingably arranged.

[0014] Furthermore, it also includes a driving structure, which drives the cam to rotate and keep it stationary.

[0015] Furthermore, the driving structure includes an electromagnetic driving structure, and the electromagnetic driving structure drives the cam to rotate.

[0016] Furthermore, the driving structure further includes 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 remain stationary.

[0017] Furthermore, the power switch is a vacuum switch.

[0018] Furthermore, the power switch is an air switch.

[0019] A transfer switch includes the dual power conversion mechanism as described above.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The present invention provides a dual power conversion mechanism, comprising: a cam, on which at least two cam surfaces with different rotation radii are provided; two pulleys, both supported on the cam surfaces, wherein when the cam rotates, one of the pulleys performs a linear motion close to the cam shaft and the other pulley performs a linear motion away from the cam shaft, depending on the difference in the cam surfaces; two linkage structures, wherein 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, wherein the power switches are driven to be closed or disconnected by the linear motion of the pulleys; and two limiting members, which limit the pulleys from sliding along the cam surfaces. This structure is a dual power conversion mechanism, in which the closing and disconnection of the power switch are driven by the rotation of the cam, the linear movement of the pulley, and the swinging of the linkage structure. Since the cam surface has different rotation radii, the pulley corresponds to different positions in the linear motion at different rotation radii, that is, when the pulley is on the cam surface with a small rotation radius, it corresponds to the position close to the cam shaft in the linear motion, and when it is on the cam surface with a large rotation radius, it corresponds to the position away from the cam shaft in the linear motion. The power switch is closed and disconnected by driving the linkage structure to move when the pulley is located at different positions in the linear motion. Since one pulley makes a linear motion close to the cam shaft and the other pulley makes a linear motion away from the cam shaft, it is ensured that the two pulleys make linear motion in different directions. The linear motions in different directions correspond to different states of the power switch, that is, one power switch is closed and the other power switch is disconnected. Both power switches will not be closed at the same time, thereby avoiding the short circuit of the two power supplies, damage to the conversion switch, and safety hazards, thereby ensuring the reliability of the conversion switch.

[0022] 2. In a dual power conversion mechanism of the present invention, when the cam is stationary, the pulleys are supported by cam surfaces of different rotational radii. This structure allows the pulleys to be at different positions during linear motion, i.e., one power switch is closed and the other is open, maintaining the corresponding states of the two power switches.

[0023] 3. In a dual power conversion mechanism of the present invention, when the cam rotates, the two pulleys do not simultaneously perform linear motion away from or toward the cam shaft. In a dual power conversion mechanism with this structure, the pulley furthest from (or closest to) the cam shaft moves first, and the corresponding switch opens first; then the pulley closest to (or furthest from) the cam shaft moves last, and the corresponding switch closes. The two power switches close and open in a sequential order, ensuring that both power switches will not be closed even in the presence of an arc.

[0024] 4. In a dual power conversion mechanism of the present invention, the drive structure includes an electromagnetic drive structure that drives the cam to rotate. This dual power conversion mechanism, by including the electromagnetic drive structure, enables the power switch contacts to actuate quickly, enabling rapid closing and opening of the power switch.

[0025] 5. In a dual power conversion mechanism of the present invention, the drive structure further comprises a permanent magnet drive structure or a cam locking structure, which drives the cam to remain stationary. This dual power conversion mechanism utilizes the permanent magnet drive structure or the cam locking structure, wherein the permanent magnet drive structure relies on permanent magnetic force to maintain the cam's stationary state, and the cam locking structure relies on mechanical locking to maintain the cam's stationary state, rather than relying on electromagnetic force. This eliminates the need for continuous electromagnetic force to maintain the switching state, thereby conserving energy.

[0026] 6. In a dual power conversion mechanism of the present invention, the power switch is a vacuum switch. This structure allows for rapid contact actuation, shortening the contact actuation time to less than 10ms and the transfer switch switching time to less than 20ms. This mechanism can be used in UPS (uninterruptible power supplies) and is directly applicable to demanding loads such as computers and servers.

[0027] 7. A transfer switch of the present invention includes the dual power conversion mechanism described above. Since the transfer switch of this structure includes the dual power conversion mechanism described above, it naturally has the advantages brought about by including the dual power conversion mechanism described above. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a schematic structural diagram of the dual power conversion mechanism provided in Example 1 of the present invention;

[0030] Figure 2 for Figure 1 The schematic diagram of the structure of the dual power conversion mechanism shown is that the common side power switch is disconnected and the standby side power switch is disconnected;

[0031] Figure 3 for Figure 2The schematic diagram of the structure of the dual power conversion mechanism shown is that the common side power switch is disconnected and the standby side power switch is disconnected;

[0032] Figure 4 for Figure 3 A schematic diagram of the structure of a dual power conversion mechanism in which the common side power switch is disconnected and the standby side power switch is closed;

[0033] Figure 5 This is a schematic structural diagram of a dual power conversion mechanism provided in Example 2 of the present invention;

[0034] Figure 6 for Figure 5 The schematic diagram of the structure of the dual power conversion mechanism shown is that the common side power switch is disconnected and the standby side power switch is disconnected;

[0035] Figure 7 for Figure 6 The schematic diagram of the structure of the dual power conversion mechanism shown is that the common side power switch is disconnected and the standby side power switch is disconnected;

[0036] Figure 8 for Figure 7 A schematic diagram of the structure of a dual power conversion mechanism in which the common side power switch is disconnected and the standby side power switch is closed;

[0037] Figure 9 Schematic diagram of the structure of the dual power conversion mechanism provided in Example 3 of the present invention;

[0038] Figure 10 for Figure 9 The schematic diagram of the structure of the dual power conversion mechanism shown is that the common side power switch is disconnected and the standby side power switch is disconnected;

[0039] Figure 11 for Figure 10 A schematic diagram of the structure of a dual power conversion mechanism in which the common side power switch is disconnected and the standby side power switch is closed;

[0040] Description of reference numerals:

[0041] 11- Normal side power switch, 12- Standby side power switch;

[0042] 2-cam, 21-first cam surface, 22-second cam surface;

[0043] 311 - first swing connecting arm on the common side, 312 - second swing connecting arm on the common side, 32 - first connecting piece on the common side, 331 - first swing connecting arm on the standby side, 332 - second swing connecting arm on the standby side, 34 - first connecting piece on the standby side;

[0044] 41 - driving connector, 42 - closing coil, 43 - closing iron core, 44 - opening coil, 45 - opening iron core, 46 - permanent magnet, 47 - first biasing element;

[0045] 51 - second swinging member on the common side, 52 - second connecting member on the common side, 53 - third connecting member on the common side, 54 - second swinging member on the standby side, 55 - second connecting member on the standby side, 56 - third connecting member on the standby side;

[0046] 61 - abutting wall, 62 - electromagnetic coil, 63 - second biasing member, 64 - electromagnetic core, 65 - linkage rod;

[0047] 71-fourth connecting piece on the common side, 72-limiting sleeve on the common side, 73-fourth connecting piece on the spare side, 74-limiting sleeve on the spare side;

[0048] 81-normal side pulley, 82-spare side pulley;

[0049] 91-common side limiting action member, 92-standby side limiting action member. DETAILED DESCRIPTION

[0050] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0054] Example 1

[0055] This embodiment provides Figures 1 to 4 A dual power conversion mechanism shown includes a cam 2, two pulleys, two linkage structures, two limiting action members and a driving structure.

[0056] like Figures 1 to 4 As shown, the cam 2 is rotatably connected to the first support, and the cam 2 is provided with at least two cam surfaces with different rotation radii, that is, the cam surface includes at least a first cam surface 21 and a second cam surface 22, wherein the rotation radius of the first cam surface 21 is greater than the rotation radius of the second cam surface 22.

[0057] like Figures 1 to 4 As shown, two pulleys, a common side pulley 81 and a backup side pulley 82, are supported on the cam surface. As cam 2 rotates, one pulley first moves away from the cam, while the other pulley then moves toward the cam, depending on the cam surface's curvature. When cam 2 is stationary, the pulleys are supported by cam surfaces of different rotational radii. As cam 2 rotates, the two pulleys do not move away from or toward the cam simultaneously.

[0058] When cam 2 is stationary, the pulleys are supported by cam surfaces of different rotational radii, placing the pulleys at different positions during linear motion. This means one power switch is closed and the other is open, maintaining the corresponding states of the two power switches. The pulley furthest from (or closest to) the cam shaft moves first, causing the corresponding switch to open first. The pulley closest to (or furthest from) the cam shaft then moves last, causing the corresponding switch to close. The two power switches close and open sequentially, ensuring that both switches will not be closed even in the presence of an arc.

[0059] like Figures 1 to 4 As shown, the input ends of the linkage structure are all rotatably connected to the pulley, and the output ends of the linkage structure are all fixedly connected to the moving contact of the power switch, and the power switch is driven to close and open through the linear motion of the pulley. The power switch in this embodiment is a vacuum switch. Figures 1 to 4 As shown, there are two power switches, one of which is a common side power switch 11 and the other is a standby side power switch 12. Figures 1 to 4 In the figure, the power switch located at the top is the normal side power switch 11, and the power switch located at the bottom is the standby side power switch 12, and each power switch includes a moving contact and a static contact.

[0060] Since the power switch is a vacuum switch, there is no arc extinguishing time, which makes the contacts of the vacuum switch move quickly. The contact action time can be shortened to within 10ms, and the switching time of the transfer switch can be shortened to within 20ms. It can be used in UPS uninterruptible power supplies and is directly applicable to harsh loads such as computers and servers.

[0061] Specifically, the linkage structure is swing-set and there are two of them, namely the common side linkage structure and the standby side linkage structure. Figures 1 to 4 As shown, the common-side linkage structure in this embodiment includes a common-side first swinging member and a common-side first connecting member 32. The common-side first swinging member includes a common-side first swing connecting arm 311 and a common-side second swing connecting arm 312. One end of the common-side first swing connecting arm 311 is rotatably connected to the common-side second support, and the other end is rotatably connected to the common-side first connecting member 32. The common-side second swing connecting arm 312 is provided on the side of the common-side first swing connecting arm 311. The end of the common-side second swing connecting arm 312 forms an input end that is rotatably connected to the common-side pulley 81. The end of the common-side first connecting member 32 away from the common-side first swing connecting arm 311 forms an output end that is fixedly connected to the moving contact of the common-side power switch 11.

[0062] like Figures 1 to 4 As shown, the standby-side linkage structure in this embodiment includes a standby-side first swinging member and a standby-side first connecting member 34. The standby-side first swinging member includes a standby-side first swinging connecting arm 331 and a standby-side second swinging connecting arm 332. One end of the standby-side first swinging connecting arm 331 is rotatably connected to the standby-side second support, and the other end is rotatably connected to the standby-side first connecting member 34. The standby-side second swinging connecting arm 332 is provided on the side of the standby-side first swinging connecting arm 331. The end of the standby-side second swinging connecting arm 332 forms an input end that is rotatably connected to the standby-side pulley 82. The end of the standby-side first connecting member 34, away from the standby-side first swinging connecting arm 331, forms an output end that is fixedly connected to the moving contact of the standby-side power switch 12.

[0063] The two limiting members in this embodiment are respectively the common side limiting member 91 and the standby side limiting member 92, which limit the corresponding pulleys to slide along the cam surface. Both limiting members can be tension springs. Figures 1 to 4 One end of the common side limiting action member 91 is fixed on the first support, and the other end of the common side limiting action member 91 is fixed on the common side pulley 81; one end of the spare side limiting action member 92 is fixed on the first support, and the other end of the spare side limiting action member 92 is fixed on the spare side pulley 82.

[0064] The driving structure in this embodiment drives the cam 2 to rotate and keep it stationary. Figures 1 to 4As shown, the drive structure includes an electromagnetic drive structure and a permanent magnet drive structure. The electromagnetic drive structure drives cam 2 to rotate, while the permanent magnet drive structure keeps cam 2 stationary. Specifically, the electromagnetic drive structure includes a drive connector 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.

[0065] By providing an electromagnetic drive structure, the power switch contacts move quickly when driving the power switch, allowing the power switch to be quickly closed and opened. By providing a permanent magnet drive structure, which relies on permanent magnetic force to maintain the cam 2 in a stationary state rather than relying on electromagnetic force, there is no need to continuously generate electromagnetic force to maintain the switch state, thus saving energy.

[0066] The closing coil 42 is arranged around the closing core 43 to close the normal side power switch; the opening coil 44 is arranged around the opening core 45 to disconnect the standby side power switch; the driving connector 41 can be fixed to the cam 2 by welding or bonding; the armature is arranged on the side of the driving connector 41 close to the closing core 43 and is arranged corresponding to the closing core 43 and the opening core 45; the permanent magnet 46 keeps the armature and the closing core 43 in a fit state to close the normal side power switch 11 or the standby side power switch 12, or the permanent magnet keeps the armature and the closing core 43 in a separated state to disconnect the normal side power switch 11 or the standby side power switch 12; the first biasing member 47 applies a biasing force to the driving connector 41 to move it away from the closing core 43, so as to overcome the attraction of the permanent magnet 46 and move the armature away from the closing core 43, wherein the first biasing member 47 can be a compression spring.

[0067] When the trip coil 44 is energized, it generates a magnetic flux in the opposite direction to that of the permanent magnet 46, which offsets the attraction of the permanent magnet 46 on the armature. The driving connecting member 41 rotates clockwise under the action of the first biasing member 47, driving the cam 2 to rotate clockwise around the first support. The common side pulley 81 moves from the second cam surface 22 to the first cam 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. The common side first swing connecting arm 311 drives the common side first connecting member 32 to move in a direction away from the moving contact, so that the moving contact moves away from the static contact, thereby disconnecting the common side power switch 11. At the same time, the standby side pulley 82 moves on the first cam surface 21 on the cam 2, so it remains stationary relative to the first support, and the standby side power supply remains disconnected.

[0068] Then the driving connecting member 41 continues to rotate clockwise around the first support, the common side pulley 81 moves on the first cam surface 21 on the cam 2, remains stationary relative to the first support, and the common side power switch 11 remains disconnected; at the same time, the standby side pulley 82 moves from the first cam surface 21 on the cam 2 to the second cam surface 22, driving the standby side first swing connecting arm 331 to rotate clockwise around the standby side second support, and the standby side first swing connecting arm 331 pushes the standby side first connecting member 34 toward the direction close to the static contact, so that the moving contact approaches the static contact, thereby realizing the closing of the standby side power switch 12. After the movement is completed, the driving connecting member 41 remains stationary under the action of the first biasing member 47, and the cam 2 remains in an unchanged state, so that the states of the common side power switch 11 and the standby side power switch 12 remain unchanged.

[0069] 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 and moves downward under the combined force of the electromagnetic force of the closing iron core 43 and the permanent magnetic force of the permanent magnet 46, driving the cam 2 to rotate counterclockwise around the first support. The movement of the common side pulley 81 and the standby side pulley 82 on the cam 2 drives the common side first swing connecting arm 311 and the standby side first swing connecting arm 331 to rotate counterclockwise around the common side second support and the standby side second support respectively. The standby side first connecting member 34 moves away from the static contact and the common side first connecting member 3232 moves toward the static contact, thereby realizing the movement sequence of the standby side power switch 12 being disconnected first and then the common side power switch 11 being closed again. After the movement is completed, the closing coil 42 loses power, and the armature remains stationary under the combined force of the permanent magnet 46 and the first biasing member 47, so that the states of the common side power switch 11 and the standby side power switch 12 remain unchanged.

[0070] The working process of a dual power conversion mechanism in this embodiment is as follows:

[0071] exist Figure 1 When the power switch 11 on the common side is closed, the power switch 12 on the standby side is disconnected. The driving connecting member 41 overcomes the elastic force of the first biasing member 47 and remains stationary under the action of the armature and the permanent magnet 46.

[0072] from Figures 1 to 2 、 Figures 2 to 3During the process, the opening coil 44 is closed to generate magnetic flux, which weakens the magnetic flux of the permanent magnet 46. The magnetic force is less than the elastic force of the first biasing member 47, and the armature together with the driving connecting member 41 moves away from the opening iron core 45. The cam 2 rotates clockwise around the first support, and the common side pulley 81 moves from the second cam surface 22 to the first cam surface 21. The common side first swing connecting arm 311 rotates clockwise around the common side second support, and the common side first connecting member 32 drives the moving contact away from the static contact, so that the common side power switch 11 is disconnected, the standby side pulley 82 remains stationary relative to the first support, and the standby side power switch 12 remains disconnected.

[0073] exist Figure 2 、 Figure 3 When the power switch 11 on the common side is disconnected, the power switch 12 on the standby side is not closed. This is a transient state during the movement.

[0074] from Figures 3 and 4 During the process, the driving connecting member 41 continues to move away from the opening 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 remains disconnected, the standby side pulley 82 moves from the first cam surface 21 to the second cam surface 22, the standby side first swing connecting arm 331 rotates clockwise around the standby side second support, and the moving contact moves close to the static contact under the action of the standby side first connecting member 34, so that the standby side power switch 12 is closed.

[0075] exist Figure 4 When the common side power switch 11 is disconnected and the standby side power switch 12 is closed, the driving connecting member 41 remains stationary under the action of the first biasing member 47 .

[0076] from Figure 4 to Figure 3 During the process, 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 together with the driving plate moves toward the opening iron core 45, the cam 2 rotates counterclockwise around the first support, the standby side pulley 82 moves from the second cam surface 22 to the first cam 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 away from the static 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.

[0077] from Figure 3 to Figure 2 、 Figure 2 to Figure 1During the process, 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 remains disconnected, the common side pulley 81 moves from the first cam surface 21 to the second cam surface 22, the common side first swing connecting arm 311 rotates counterclockwise around the common side second support, and the moving contact approaches the static contact under the action of the common side first connecting member 32, so that the common side power switch 11 is closed.

[0078] In a dual power conversion mechanism of the present invention, the closing and disconnection of the power switch are driven by the rotation of a cam 2, the linear movement of a pulley, and the swinging of a linkage structure. Since the cam surfaces have different rotation radii, the pulleys correspond to different positions in the linear motion at different rotation radii, that is, when the pulley is on the cam surface with a small rotation radius, it corresponds to a position close to the cam shaft in the linear motion, and when it is on the cam surface with a large rotation radius, it corresponds to a position away from the cam shaft in the linear motion. The closing and disconnection of the power switch are achieved by driving the linkage structure to move when the pulleys are located at different positions in the linear motion. Since one pulley performs a linear motion close to the cam shaft and the other pulley performs a linear motion away from the cam shaft, the two pulleys are ensured to perform linear motion in different directions. The linear motions in different directions correspond to different states of the power switch, that is, one power switch is closed and the other power switch is disconnected. Both power switches will not be closed, thereby avoiding the short circuit of the two power supplies, damage to the conversion switch, and safety hazards, thereby ensuring the reliability of the conversion switch.

[0079] Example 2

[0080] This embodiment provides a Figures 5 to 8 The dual power conversion mechanism shown is different from that of embodiment 1 in that the linkage structure and the driving structure are different.

[0081] like Figures 5 to 8 As shown, 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 the common side third support. The end of the common side second connecting member 52 close to the second cam surface 22 forms an input part rotatably connected to the pulley. The common side third connecting member 53 has an output part fixedly connected to the moving contact of 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 ends of the swing fulcrum of the common side second swinging member 51, wherein the swing fulcrum of the common side second swinging member 51 is the rotation connection between the common side second swinging member 51 and the third support.

[0082] like Figures 5 to 8As shown, the standby side linkage structure in this embodiment includes a standby side second swinging member 55, a standby side second connecting member and a standby side third connecting member 56. The standby side second swinging member 55 is rotatably connected to the standby side third support. The end of the standby side second connecting member close to the second cam surface 22 forms an input part rotatably connected to the pulley. The standby side third connecting member 56 has an output part fixedly connected to the moving contact of the standby side power switch 12. The standby side second connecting member and the standby side third connecting member 56 are rotatably connected to different ends of the swing fulcrum of the standby side second swinging member 55, wherein the swing fulcrum of the standby side second swinging member 55 is the rotation connection between the standby side second swinging member 55 and the third support.

[0083] The second swing member, the second connecting member and the third connecting member form a lever structure. According to the lever principle, the swing fulcrum of the second swing member can be set close to the output end to achieve the closing and disconnection of the power switch with a smaller force.

[0084] like Figures 5 to 8 As shown, the driving structure in this embodiment includes an electromagnetic driving structure and a cam locking structure. The electromagnetic driving structure drives the cam 2 to remain stationary, and the cam locking structure drives the cam 2 to remain stationary. The electromagnetic driving structure includes an electromagnetic coil 62, an electromagnetic core 64 and a linkage rod 65, and the cam locking structure includes an abutment wall 61 and a second biasing member 63. Specifically, the second biasing member 63, such as a spring, is located between the abutment wall 61 and the electromagnetic core 64, the electromagnetic coil 62 is arranged around the electromagnetic core 64, and the two ends of the linkage rod 65 are rotatably connected to the electromagnetic core 64 and the cam 2 respectively. Of course, the driving structure in Example 1 and the driving structure in Example 2 are interchangeable, or may not be provided, but the cam 2 is rotated by manual drive.

[0085] The working process of the dual power conversion mechanism in this embodiment is as follows:

[0086] (1) Figure 5 As shown, in the normal state, the electromagnetic coil 62 loses power, the power switch relies on the elastic force of the second biasing member 63 and other transmission structures to maintain the state of the power switch, and the load output is powered by the closing of the common side power switch 11;

[0087] (2) When the electromagnetic coil 62 is energized, a magnetic field is generated, and the electromagnetic force attracts the electromagnetic core 64 to move toward the center of the electromagnetic coil 62. The linkage rod 65 moves accordingly, and drives the cam 2 to rotate counterclockwise. Under the action of the tension spring force of the common side limiting action member 91 and the backup side limiting action member 92, the common side pulley 81 and the backup side pulley 82 move toward and away from the first support, respectively, that is, toward the second cam surface 22 and the first cam surface 21, respectively. Then, driven by the common side linkage structure and the backup side linkage structure, the common side power switch 11 moves toward disconnection and the backup side power switch 12 moves toward closing.

[0088] (3) Figure 6 、 Figure 7 As shown, when both the normal side power switch 11 and the standby side power switch 12 are on the second cam surface 22, a moment when both the normal side power switch 11 and the standby side power switch 12 are disconnected is provided;

[0089] (4) When the electromagnetic core 64 moves to the farthest end from the cam 2, the linkage rod 65 limits the position of the electromagnetic core 64 to continue moving away from the cam 2, and the cam 2 will deviate from the symmetrical position under the action of inertia;

[0090] (5) Figure 8 As shown, when the electromagnetic coil 62 loses power and electromagnetic force, the compressed second biasing member 63 releases energy, pushing the electromagnetic core 64 to move toward the cam 2, and the linkage rod 65 continues to push the cam 2 to rotate counterclockwise, and then the common side linkage structure and the standby side linkage structure respectively drive the common side power switch 11 to open and the standby side power switch 12 to close. The load output is powered by the closing of the standby side power switch 12;

[0091] (6) The state of the power switch is maintained by the elastic force of the second biasing member 63;

[0092] (7) When the electromagnetic coil 62 is energized again, the above processes (1) to (6) are repeated, but the cam 2 rotates clockwise, so that the normal side power switch 11 is closed and the standby side power switch 12 is disconnected, and the load output is powered by the normal side power switch 11 being closed.

[0093] Example 3

[0094] This embodiment provides a Figures 9 to 11 The dual power conversion mechanism shown differs from Example 1 in that the linkage structure and power switch are different, and no drive structure is provided. The power switch can be driven by the drive structure of Example 1 or Example 2, or manually driven to close or open.

[0095] like Figures 9 to 11As shown, the power switch in this embodiment is an air switch, and the switch contact connection can be a bridge type or a pointer type.

[0096] like Figures 9 and 10 As shown, the common side linkage structure in this embodiment includes a common side fourth connecting member 71 and a common side limiting sleeve 72. 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 an output end fixedly connected to the moving contact of the common side switch.

[0097] like Figures 9 and 10 As shown, the standby side linkage structure in this embodiment includes a standby side fourth connecting member 73 and a standby side limiting sleeve 74. One end of the standby side fourth connecting member 73 forms an input end rotatably connected to the standby side pulley 82, and the other end forms an output end fixedly connected to the moving contact of the standby side switch.

[0098] The working process of the dual power conversion mechanism in this embodiment is as follows:

[0099] exist Figure 9 In the process, the normal side power switch 11 is closed and the standby side power switch 12 is disconnected.

[0100] from Figures 9 and 10 During the process, the cam 2 rotates clockwise around the first support, the common side pulley 81 moves from the first cam surface 21 to the second cam surface 22, and the common side fourth connecting member 71 drives the moving contact away from the static contact, so that the common side power switch 11 is disconnected, the standby side pulley 82 remains stationary relative to the first support, and the standby side power switch 12 remains disconnected.

[0101] exist Figure 10 In the process, the power switch 11 on the common side is disconnected, and the power switch 12 on the standby side is not closed. This is a transient state during the movement.

[0102] from Figures 10 and 11 During the process, 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 remains disconnected, and the spare side pulley 82 moves from the second cam surface 22 to the first cam surface 21. The moving contact moves close to the static contact under the action of the fourth connecting member 73 on the spare side, so that the spare side power switch 12 is closed.

[0103] exist Figure 11 In the process, the normal side power switch 11 is disconnected and the standby side power switch 12 is closed.

[0104] from Figures 11 to 10During the process, the cam 2 rotates counterclockwise around the first support, the spare side pulley 82 moves from the first cam surface 21 to the second cam surface 22, and the spare side fourth connecting member 73 drives the moving contact away from the static contact, so that the spare side power switch 12 is disconnected, the normal side pulley 81 remains stationary relative to the first support, and the normal side power switch 11 remains disconnected.

[0105] from Figures 10 to 9 During the process, 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 remains disconnected, and the common side pulley 81 moves from the second cam surface 22 to the first cam surface 21. The moving contact approaches the static contact under the action of the fourth connecting member 71 on the common side, so that the common side power switch 11 is closed.

[0106] Example 4

[0107] This embodiment provides a transfer switch, including a dual power conversion mechanism as provided in any one of Embodiments 1 to 3.

[0108] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A dual power conversion mechanism, comprising a normal side power switch and a standby side power switch, characterized in that: Also includes: A cam having at least two cam surfaces with different rotational radii; Two pulleys are supported on the cam surface. When the cam rotates, one of the pulleys moves linearly toward the cam shaft, while the other moves linearly away from the cam shaft, depending on the difference in the cam surface. When the cam is stationary, the pulleys are supported by the cam surfaces with different rotational radii. When the cam rotates, the two pulleys do not move linearly away from or toward the cam shaft at the same time. The normal-side power switch and the backup-side power switch have a transient state in which the normal-side power switch is disconnected and the backup-side power switch is not yet closed. Two linkage structures, 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, and the power switches are driven to be closed and opened through the linear motion of the pulleys; Two limiting members limit the pulley to slide along the cam surface.

2. A dual power conversion mechanism according to claim 1, characterized in that: The linkage structure is swingably arranged.

3. A dual power conversion mechanism according to any one of claims 1 to 2, characterized in that: It also includes a driving structure, which drives the cam to rotate and keep it stationary.

4. A dual power conversion mechanism according to claim 3, characterized in that: The driving structure includes an electromagnetic driving structure, and the electromagnetic driving structure drives the cam to rotate.

5. A dual power conversion mechanism according to claim 4, characterized in that: The driving structure further includes 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 remain stationary.

6. A dual power conversion mechanism according to any one of claims 1 to 3, characterized in that: The power switch is a vacuum switch.

7. A dual power conversion mechanism according to any one of claims 1 to 3, characterized in that: The power switch is an air switch.

8. A transfer switch, characterized in that: The dual power conversion mechanism comprises the dual power conversion mechanism as claimed in any one of claims 1 to 7.

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