Dual power transfer switch and driving device thereof

Abstract

This invention discloses a dual-power transfer switch and its driving device. The driving device includes an operating mechanism and a transmission assembly. The operating mechanism includes two sets of permanent magnet driving mechanisms. The transmission assembly includes a drive shaft, a swing arm, and two connecting rods. One end of the drive shaft is connected to the middle of the swing arm, and the other end is connected to the moving contact assembly. Both ends of the swing arm are connected to the two sets of permanent magnet driving mechanisms via connecting rods. The two sets of permanent magnet driving mechanisms drive the drive shaft to rotate, causing the moving contact assembly to switch between the normally closed, standby closed, and double-open positions, and maintain the closed position through permanent magnet force. The dual-power transfer switch includes a housing, a main circuit device, and the aforementioned driving device. The main circuit device is composed of single-pole modules. The drive shaft of the driving device extends into the housing and is connected to the rotating base. This invention is small in size, compact in structure, fast in switching speed, and highly reliable. It can be mounted on a guide rail and is suitable for confined spaces such as indoor boxes and electrical control boxes.

Description

Technical Field

[0001] This invention belongs to the field of changeover switch electrical technology, specifically relating to a dual power transfer switch, and more particularly to a rail-mounted dual power transfer switch and its driving device. Background Technology

[0002] A dual power transfer switch is a common low-voltage electrical appliance, often used in important power distribution applications (such as data centers) to switch between two or more power sources, ensuring that when the primary power source fails during power supply, it can quickly switch to the backup power source to ensure normal power supply to the load.

[0003] With the rapid development of the economy and society and the advancement of technology, the performance and reliability of modern power supply and distribution systems need to meet the increasingly diverse demands of load types. Dual-power transfer switches, as power distribution devices used in critical locations such as airports, hospitals, data centers, sports centers, energy storage facilities, and conference centers, handle complex and varied load conditions. When the load is a high-inductive load such as a motor, switching power inevitably generates huge inrush currents or high voltages in the main circuit, leading to extreme situations. Simultaneously, the phase difference between the two power supplies also impacts the main circuit. Three-position transfer switches have three operating positions: the primary power supply closed position, the backup power supply closed position, and the dual-power supply disconnected position. During normal power switching, the switch can remain in the dual-power supply disconnected position for a period of time (adjustable), i.e., a fully disconnected state, avoiding the impact of inrush currents on the main circuit load and the transfer switch itself. In certain specific situations, such as manual operation mode, the three-position transfer switch, in the dual-power supply disconnected position, can achieve isolation and maintenance functions. Meanwhile, the three-position changeover switch can also realize fire alarm linkage function. When extreme abnormal situations such as fire occur in the above-mentioned important places, it can receive instructions to quickly cut off the two power supplies and realize the fire alarm disconnection function.

[0004] To achieve the above three working positions, existing three-position changeover switches on the market often arrange two sets of contacts in the main circuit. Both sets of contacts are in the open state, i.e., the two power supplies are disconnected in the third working position. At the same time, the operating mechanism needs to arrange two sets of square shafts and transmission components to drive the above moving contact group to move. The cost is relatively high, the switching action time is long, the structure is complex, and the size is large.

[0005] These products are further categorized by their installation method into integrated controller types and external door-mounted controller types. These dual-power switching products, currently dominating the market, typically involve bolting the switch body to the mounting plate of the distribution box or the mounting channel steel of the distribution cabinet. The controller is integrated within the switch body or mounted on the door of the distribution box or cabinet, and the controller is connected to the switch body via control cables. These products, whether CB or PC class, offer a full range of current specifications, and the controllers offer diverse functions, allowing users to choose different products based on their specific needs. However, with increasing demands for cost and installation space from customers in the photovoltaic new energy industry and data center industry, further cost reduction and size miniaturization of these products are becoming increasingly difficult.

[0006] In the application of new energy industries, the conventional dual-power switching box for residential photovoltaic or residential energy storage and mains power supply is difficult to match with the increasingly competitive photovoltaic new energy projects due to its high cost and large size. Moreover, the installation and controller wiring are complicated and the large size makes it impossible to install in indoor boxes, which is very inconvenient for residential distributed photovoltaic and residential energy storage users.

[0007] In data center applications, UPS systems are often used as reliable uninterruptible power supply devices for electronic equipment, requiring abnormal power outage time of less than 5ms to ensure data security. Static transfer switches are typically used as switching devices, but they are currently expensive and bulky. Data centers usually require a constant temperature and humidity environment. Excessively high or low temperatures can adversely affect the stable operation of equipment, even causing downtime and resulting in huge economic losses. Therefore, precision air conditioners have emerged to meet the needs of small and medium-sized, modular data centers with energy-saving / high heat density requirements. They aim to ensure that precision equipment such as sensitive equipment, industrial process equipment, communication equipment, and computers have a reasonable operating environment. Therefore, ensuring the continuous normal operation and power supply of precision air conditioners is crucial. If static transfer switches are used as switching devices for precision air conditioners, they are currently expensive and bulky, and cannot be installed in the electrical control box (or enclosure) of the precision air conditioner. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a rail-mounted dual power transfer switch and its driving device that is small in size, compact in structure, fast in switching speed and highly reliable, in view of the above-mentioned defects of the prior art.

[0009] A driving device for a dual-power transfer switch is provided for driving the moving contact assembly of the dual-power transfer switch to operate. The device includes an operating mechanism and a transmission assembly. The operating mechanism includes two sets of permanent magnet drive mechanisms. The transmission assembly includes a drive shaft, a swing arm, and two connecting rods. One end of the drive shaft is connected to the middle of the swing arm, and the other end is connected to the moving contact assembly. Both ends of the swing arm are connected one-to-one to the two sets of permanent magnet drive mechanisms via a connecting rod. The two sets of permanent magnet drive mechanisms drive the drive shaft to rotate, thereby switching the moving contact assembly between a normally closed position, a standby closed position, and a double-open position. The device maintains the state in the normally closed position or the standby closed position through permanent magnet force.

[0010] Furthermore, each set of permanent magnet drive mechanisms includes a bracket, an energy storage spring, and an insulating sleeve, a permanent magnet core, a moving iron core, a closing coil, and a closing coil respectively disposed within the bracket; the permanent magnet core is installed at one end inside the insulating sleeve; the moving iron core is slidably sleeved within the insulating sleeve, with one end of the moving iron core facing the permanent magnet core, and the other end sliding out of the bracket and hinged to the connecting rod via a hinge shaft; the energy storage spring is sleeved on the moving iron core, with one end abutting against the bracket and the other end abutting against the hinge shaft; the closing coil and the closing coil are wound around the outside of the insulating sleeve, and an insulating layer is provided between the closing coil and the closing coil, with both the closing coil and the opening coil located around the periphery of the moving iron core.

[0011] Furthermore, in the normal closing position or the standby closing position, the permanent magnet core attracts the moving iron core and compresses the energy storage spring to maintain the state; when switching from the double-open position to the normal closing position or the standby closing position, the closing coil and the opening coil are simultaneously energized in the forward direction; when switching from the normal closing position or the standby closing position to the double-open position, the opening coil is energized in the reverse direction, which weakens the attraction of the permanent magnet core to the moving iron core, and the energy storage spring resets and drives the moving iron core to move.

[0012] Furthermore, the operating mechanism also includes a controller, which is electrically connected to the closing coil and the opening coil of the two sets of permanent magnet drive mechanisms, respectively, for collecting power status and controlling the operation of the permanent magnet drive mechanism according to preset logic.

[0013] This invention also provides a rail-mounted dual-power transfer switch, comprising a housing, a main circuit device, and the aforementioned drive device; the housing includes a first housing and a second housing; the main circuit device is assembled from at least one single-pole module; each single-pole module includes a first housing and a moving contact assembly, a stationary contact assembly, a U-shaped connecting rod, a support, and a rotating seat respectively installed in the first housing; the moving contact assembly and the stationary contact assembly are each provided in two sets and are paired one-to-one; each set of moving contact assemblies is rotatably arranged and has a contact point, and each set of moving contact assemblies rotates back and forth between a closed position and an open position relative to the corresponding stationary contact assembly, wherein in the closed position, the contact point interacts with the corresponding stationary contact assembly. The corresponding stationary contact assembly is in contact and conductive. In the open position, the contact is separated from the corresponding stationary contact assembly. The support is rotatably connected inside the first housing. The support is provided with two shafts for driving the two sets of moving contact assemblies to rotate one-to-one, so as to realize the switching between the normal closing position, the standby closing position and the double-open position. In the double-open position, both sets of moving contact assemblies are in the open position. The rotating seat is rotatably disposed inside the first housing. The two ends of the U-shaped connecting rod are respectively connected to the support and the rotating seat. The driving device is installed inside the second housing, and the other end of the drive shaft of the driving device extends into the first housing and is connected to the rotating seat.

[0014] Furthermore, each monopole module also includes a handle; one end of the handle is fixed to the rotating base, and the other end extends out of the first housing and can swing back and forth.

[0015] Furthermore, both sets of moving contact assemblies include a support and a conductive component; the support and the conductive component are made of different materials and are fixed together by riveting to reduce manufacturing costs.

[0016] Furthermore, a cylindrical arc-blocking structure is provided between the two sets of stationary contact assemblies. Both the first housing and the second housing are provided with interconnected guide rail mounting grooves.

[0017] Furthermore, each of the two sets of moving contact assemblies is provided with an opening slot and a tension spring; the two shafts on the support are respectively engaged with the two opening slots to drive the two sets of moving contact assemblies to rotate; the two tension springs are respectively connected between the corresponding moving contact assembly and the support to provide the pulling force for opening and closing the circuit.

[0018] The beneficial effects of this invention are as follows: This invention employs two sets of permanent magnet drive mechanisms as the power source for the operating mechanism. Through the transmission shaft, swing arm, and connecting rod, it can quickly switch between three working positions: normal closing, standby closing, and dual opening. The closing position is maintained by permanent magnet force, eliminating the need for additional mechanical locking devices. The structure is simple, the switching speed is fast, and the reliability is high. In the main circuit device, the support and conductive parts of the moving contact assembly are riveted together using different materials, reducing costs. A cylindrical arc-damping structure and a U-shaped arc-extinguishing plate are incorporated to improve insulation performance and arc-extinguishing capability. The overall structure is compact, allowing for rail mounting, and is suitable for confined spaces such as household electrical control boxes. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 This is a schematic diagram of the overall structure of the dual power supply transfer switch described in this invention.

[0021] Figure 2 This is an exploded view of the dual power supply transfer switch described in this invention.

[0022] Figure 3 This is a schematic diagram of the internal structure of the single-pole module of the main circuit device of the present invention.

[0023] Figure 4 This is a schematic diagram of the internal state of the single-pole module when the moving contact assembly of the present invention is in the double-split position.

[0024] Figure 5 This is a schematic diagram of the internal state of the single-pole module of the moving contact assembly described in this invention when it is in the commonly used closing position.

[0025] Figure 6 This is a schematic diagram of the internal state of the single-pole module of the moving contact assembly in the standby closing position according to the present invention.

[0026] Figure 7 This is a schematic diagram of the external structure of the operating mechanism described in this invention.

[0027] Figure 8 This is an exploded structural diagram of the operating mechanism described in this invention.

[0028] Figure 9 This is a schematic diagram of the internal state of the operating mechanism of the moving contact assembly of the present invention in the commonly used closed position.

[0029] Figure 10 This is a schematic diagram of the internal state of the operating mechanism of the moving contact assembly of the present invention when it is in the double-position.

[0030] Figure 11 This is a schematic diagram of the internal state of the operating mechanism of the moving contact assembly in the standby closing position according to the present invention.

[0031] Figure 12 This is a schematic diagram of the permanent magnet drive mechanism described in this invention.

[0032] Figure 13 This is an exploded structural diagram of the permanent magnet drive mechanism described in this invention.

[0033] Figure 14 This is a cross-sectional view of the permanent magnet drive mechanism described in this invention.

[0034] Figure 15 for Figure 9 A schematic diagram of the internal state of the operating mechanism after the permanent magnet drive mechanism is cut open.

[0035] Figure 16 for Figure 10 A schematic diagram of the internal state of the operating mechanism after the permanent magnet drive mechanism is cut open.

[0036] Figure 17 for Figure 11 A schematic diagram of the internal state of the operating mechanism after the permanent magnet drive mechanism is cut open.

[0037] As shown in the figure: 10-Housing; 11-First Housing; 111-Guide Rail Mounting Slot; 12-Second Housing; 20-Main Circuit Device; 21-Common Power Stationary Contact Assembly; 211-Common Power Terminal Block; 212-Common Conductive Sheet; 213-Common Stationary Contact; 2131-Common Stationary Contact; 22-Backup Power Stationary Contact Assembly; 221-Backup Power Terminal Block; 222-Backup Conductive Sheet; 223-Backup Stationary Contact; 2231-Backup Stationary Contact; 23-Common Power Moving Contact Assembly; 231-First Support Member; 232-First Conductive Member; 233-Common Contact; 234-First Hinge; 235-First Opening Slot; 236-First Tension Spring; 24-Backup Power Moving Contact Assembly; 241-Second Support Member; 242-Second Conductive Member; 243-Backup Contact; 244-Second Hinge; 245-Second Opening Slot ; 246-Second tension spring; 25-Rotating shaft; 26-Arc extinguishing chamber; 27-Load end assembly; 271-Load terminal; 272-First flexible conductor; 273-Second flexible conductor; 28-Cylindrical arc-blocking structure; 29-U-shaped arc-extinguishing plate; 30-Handle; 40-Operating mechanism; 41-Permanent magnet drive mechanism; 41a-Main power supply permanent magnet drive mechanism; 41b-Backup power supply permanent magnet drive mechanism; 411-Permanent magnet Core; 412-Moving iron core; 413-Energy storage spring; 414-Coil assembly; 414a-Closing coil; 414b-Opening coil; 415-Bracket; 416-Insulating sleeve; 417-Hinge shaft; 42-Controller; 50-Transmission assembly; 51-Transmission shaft; 52-Swing arm; 53-Connecting rod; 61-U-shaped connecting rod; 62-Support; 621-First lever; 622-Second lever; 63-Rotating seat. Detailed Implementation

[0038] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings of this specification are merely for illustrative purposes to aid those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity and are not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0040] In the description of this invention, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. It should be noted that the terms "comprising," "including," or any other variations are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Example 1

[0041] like Figure 1 and Figure 2 As shown, this embodiment discloses a rail-mounted dual-power transfer switch, which includes a housing 10, a main circuit device 20, and a drive device. The housing 10 includes a first housing 11 and a second housing 12. The main circuit device 20 is installed in the first housing 11, and the drive device is installed in the second housing 12. The main circuit device 20 and the drive device are mechanically connected via a transmission assembly 50 disposed within the drive device. The main circuit device 20 is used to connect a primary power supply and a backup power supply, and can automatically switch to the backup power supply under the drive of the drive device when the primary power supply fails or is interrupted, or can automatically switch to the primary power supply under the drive of the drive device when the backup power supply fails or is interrupted.

[0042] The first housing 11 and the second housing 12 are both independent square box structures, and can be connected to each other by means of adhesive bonding, splicing, snap-fitting, etc. The number of first housings 11 and second housings 12 can be arbitrarily combined and flexibly configured according to actual pole requirements. Both the first housing 11 and the second housing 12 are provided with interconnected guide rail mounting slots 111 for snapping the dual power transfer switch onto the guide rail of the distribution box. Furthermore, both the first housing 11 and the second housing 12 are hollow boxes formed by splicing two halves of a box.

[0043] like Figures 3-6 As shown, the main circuit device 20 is assembled from at least one single-pole module. Each single-pole module includes a first housing 11 and a moving contact assembly, a stationary contact assembly, a U-shaped connecting rod 61, a support 62, a rotating seat 63, an arc-extinguishing chamber 26, a load-end assembly 27, a cylindrical arc-blocking structure 28, and a U-shaped arc-extinguishing plate 29, respectively installed in the first housing 11. Two sets of moving contact assemblies and two sets of stationary contact assemblies are provided and are paired one-to-one; each set of moving contact assemblies is rotatably arranged and has a contact point. Each set of moving contact assemblies rotates back and forth between a closed position and an open position relative to the corresponding stationary contact assembly. In the closed position, the contact point makes contact with the corresponding stationary contact assembly and conducts electricity; in the open position, the contact point separates from the corresponding stationary contact assembly. The two sets of stationary contact assemblies are the normal power stationary contact assembly 21 and the backup power stationary contact assembly 22, respectively; the moving contact assemblies include the normal power moving contact assembly 23 corresponding to the normal power stationary contact assembly 21, and the backup power moving contact assembly 24 corresponding to the backup power stationary contact assembly 22.

[0044] The common power supply stationary contact assembly 21 includes a common power supply terminal block 211, a common power supply conductive sheet 212, and a common power supply stationary contact 213. The common power supply terminal block 211 is embedded in a terminal slot on the surface of the first housing 11 and is used to connect the common power supply. The common power supply conductive sheet 212 electrically connects the common power supply terminal block 211 to the common power supply stationary contact 213, and the common power supply stationary contact 213 is provided with a common power supply stationary contact point 2131.

[0045] The backup power stationary contact assembly 22 includes a backup power terminal block 221, a backup conductive sheet 222, and a backup stationary contact 223. The backup power terminal block 221 is embedded in a terminal slot on the surface of the first housing 11 and is used to connect to the backup power supply. The backup conductive sheet 222 electrically connects the backup power terminal block 221 to the backup stationary contact 223, and the backup stationary contact 223 is provided with a backup stationary contact point 2231.

[0046] The commonly used power moving contact assembly 23 includes a first support member 231, a first conductive member 232, a commonly used contact 233, a first hinge portion 234, a first opening slot 235, and a first tension spring 236. The first conductive member 232 is fixed to one end of the first support member 231 (i.e., the end near the commonly used stationary contact 213), and the commonly used contact 233 is disposed at one end of the first conductive member 232 (i.e., the end near the commonly used stationary contact 213). The first hinge portion 234 is disposed in the middle of the first support member 231 and consists of two shafts that are vertically fixed to both sides of the first support member 231 and coaxially arranged. The two shafts are respectively rotatably installed in the pre-set slots on the two halves of the first housing 11, so that the first support member 231 can rotate around the first hinge portion 234; the first opening slot 235 is disposed at the other end of the first support member 231 (i.e., the end away from the commonly used stationary contact 213). One end of the first tension spring 236 is connected to the rotating shaft 25 on the support 62 (rotatably sleeved on the rotating shaft 25 of the support 62), and the other end of the first tension spring 236 is connected to a pre-set hole at the other end of the first conductive element 232 (hanging on a pre-set hole at the end of the first conductive element 232 away from the commonly used stationary contact 213). The commonly used power moving contact assembly 23 can rotate back and forth between the commonly used closed position and the commonly used stationary contact assembly 21 relative to the commonly used power stationary contact assembly 21. When the commonly used power moving contact assembly 23 is in the commonly used closed position, the commonly used contact 233 is in contact with the commonly used stationary contact 213; when it is in the open position, the commonly used contact 233 is separated from the commonly used stationary contact 213.

[0047] The backup power moving contact assembly 24 includes a second support member 241, a second conductive member 242, a backup contact 243, a second hinge portion 244, a second opening slot 245, and a second tension spring 246. The second conductive member 242 is fixed to one end of the second support member 241 (i.e., the end near the backup stationary contact 223), and the backup contact 243 is disposed at one end of the second conductive member 242 (i.e., the end near the backup stationary contact 223). The second hinge portion 244 is disposed in the middle of the second support member 241 and consists of two shafts vertically fixed to both sides of the second support member 241 and coaxially arranged. The two shafts are respectively rotatably installed in the pre-set slots on the two halves of the first housing 11, thereby allowing the second support member 241 to rotate around the second hinge portion 244; the second opening slot 245 is disposed at the other end of the second support member 241 (i.e., the end away from the backup stationary contact 223). One end of the second tension spring 246 is connected to the rotating shaft 25 on the support 62 (rotatably sleeved on the rotating shaft 25 of the support 62), and the other end of the second tension spring 246 is connected to a pre-set hole at the other end of the second conductive member 242 (hanging on a pre-set hole at the end of the second conductive member 242 away from the spare stationary contact 223). The backup power moving contact assembly 24 can rotate back and forth between the backup closed position and the backup stationary contact assembly 22 relative to the backup power stationary contact assembly 22. When the backup power moving contact assembly 24 is in the backup closed position, the backup contact 243 is in contact with the backup stationary contact 223; when it is in the open position, the backup contact 243 is separated from the backup stationary contact 223. The first opening slot 235 and the second opening slot 245 face opposite directions, both facing away from the area between the first support member 231 and the second support member 241.

[0048] The first support member 231 and the first conductive member 232 are made of different materials (for example, the first support member 231 is made of insulating materials such as plastic or bakelite, and the first conductive member 232 is made of conductive materials such as copper) and are fixed together by riveting. Similarly, the second support member 241 and the second conductive member 242 are also made of different materials and are fixed together by riveting to save copper and reduce manufacturing costs.

[0049] The support 62 is rotatably connected to the first housing 11 via the rotating shaft 25. Two shafts (a first lever 621 and a second lever 622) are respectively provided on the side of the support 62 near the stationary contact assembly.

[0050] The first lever 621 engages with the first opening slot 235 of the commonly used power moving contact assembly 23 to drive the commonly used power moving contact assembly 23 to rotate; the second lever 622 engages with the second opening slot 245 of the standby power moving contact assembly 24 to drive the standby power moving contact assembly 24 to rotate.

[0051] The moving contact assembly has three working positions: normal closing position, standby closing position, and double open position. When the moving contact assembly switches between the normal closing position and the standby closing position, it must first switch to the double open position.

[0052] like Figure 5 As shown, when the moving contact assembly is in the normal closing position, the first lever 621 of the support 62 is located in the first opening slot 235, the first conductive element 232 and the normal stationary contact 213 are kept in contact under the action of the first tension spring 236, and at the same time the second lever 622 is located outside the second opening slot 245, the second conductive element 242 and the spare stationary contact 223 are disengaged under the action of the second tension spring 246.

[0053] like Figure 6 As shown, when the moving contact assembly is in the standby closing position, the first lever 621 of the support 62 is located outside the first opening slot 235, and the first conductive element 232 is disengaged from the commonly used stationary contact 213 under the action of the first tension spring 236. At the same time, the second lever 622 is located inside the second opening slot 245, and the second conductive element 242 remains in contact with the standby stationary contact 223 under the action of the second tension spring 246.

[0054] like Figure 4 As shown, when the moving contact assembly is in the double-opening position, the first lever 621 of the support 62 is located in the first opening slot 235, and the first conductive element 232 is disengaged from the commonly used stationary contact 213 under the action of the first tension spring 236. At the same time, the second lever 622 is also located in the second opening slot 245, and the second conductive element 242 is disengaged from the spare stationary contact 223 under the action of the second tension spring 246.

[0055] The process by which the moving contact assembly switches between the three working positions—normal closing position, standby closing position, and double-open position—is as follows: 1. Switch from the dual-open position to the commonly used closed position.

[0056] like Figure 4As shown, in the double-open position, the first lever 621 is located in the first opening slot 235, and the second lever 622 is also located in the second opening slot 245, with both sets of moving contact assemblies open. When the support 62 rotates from the double-open position to the normally closed position (e.g., clockwise) under the drive of the drive device or handle 30, the first lever 621 rotates with the support 62 and within the first opening slot 235, pushing the first support member 231 to rotate around the first hinge portion 234, thereby causing the first conductive member 232 to rotate towards the normally stationary contact 213. During this process, the first tension spring 236 is stretched to store elastic potential energy. When the rotation passes the critical point (i.e., the dead point, at which point the lever arm of the tension direction line of the first tension spring 236 and the rotation center of the first support member 231 is zero), the elastic potential energy stored in the first tension spring 236 is rapidly released, pulling the first conductive member 232 to accelerate the completion of contact with the normal stationary contact 213 (the normal contact 233 on the first conductive member 232 contacts the normal stationary contact 2131 on the normal stationary contact 213), quickly realizing the normal power supply closing. At the same time, the second lever 622 moves away from the second opening slot 245 as the support 62 rotates, and the second support member 241 is kept away from the spare stationary contact 223 under the tension of the second tension spring 246 (or slightly moves in the opening direction), ensuring reliable opening on the spare side. During this process, the second tension spring 246 may slightly retract from the stretched state or remain unchanged, but always provides tension to keep the second conductive member 242 away from the spare stationary contact 223. At this point, the moving contact assembly has completed the switch from the double open position to the normal closed position. Figure 5 As shown, at this time, the first lever 621 is inside the first opening slot 235, and the second lever 622 is outside the second opening slot 245. The normal power moving contact assembly 23 is closed, and the standby power moving contact assembly 24 is opened. 2. Switch from the usual closed position to the double open position.

[0057] like Figure 5As shown, in the normally closed position, the first lever 621 is located inside the first slot 235, and the second lever 622 is located outside the second slot 245. The normally closed power supply moving contact assembly 23 is closed, and the standby power supply moving contact assembly 24 is open. When the support 62 rotates from the normally closed position to the double open position (reverse rotation, such as counterclockwise rotation) under the drive of the drive device or handle 30, the first lever 621 rotates in the opposite direction within the first slot 235, pushing the first support member 231 to move in the opposite direction, causing the first conductive member 232 to move away from the normally closed stationary contact 213. During this process, the first tension spring 236 is stretched and stores energy, which is released after passing the critical point, accelerating the separation of the normally closed contact 233 of the first conductive member 232 from the normally closed stationary contact 213. The first lever 621 remains in the first slot 235 (but in the deflected position on the other side). At the same time, the second lever 622 enters the second slot 245 with the reverse rotation of the support 62. Upon entry, the second lever 622 slides within the second opening slot 245, but at this time it does not push the second support member 241 towards the closing direction (because reverse rotation keeps the second support member in the holding or slightly towards the opening direction), and the second conductive member 242 remains in the open state under the action of the second tension spring 246. Thus, the switching from the commonly used closing position to the double-open position is achieved, such as... Figure 4 As shown, at this time, the first lever 621 is in the first opening slot 235, the second lever 622 is in the second opening slot 245, and the normal power moving contact assembly 23 and the backup power moving contact assembly 24 are both disconnected. 3. Switch from the dual-open position to the standby closed position.

[0058] like Figure 4As shown, in the double-open position, the first lever 621 is located in the first opening slot 235, and the second lever 622 is also located in the second opening slot 245, with both sets of moving contact assemblies open. When the support 62 rotates from the double-open position to the standby closing position (e.g., counterclockwise, opposite to the normal closing direction) under the drive of the drive device or handle 30, the second lever 622 rotates with the support 62 and within the second opening slot 245, pushing the second support member 241 to rotate around the second hinge portion 244, causing the second conductive member 242 to rotate towards the standby stationary contact 223. During this process, the second tension spring 246 is stretched and stores energy. When the rotation exceeds the critical point, the elastic potential energy stored in the second tension spring 246 is rapidly released, pulling the standby contact 243 of the second conductive member 242 to accelerate its contact with the standby stationary contact 223. Finally, the second lever 622 remains within the second opening slot 245, and the standby side is closed. Simultaneously, the first lever 621 rotates with the support 62 and moves away from the first opening slot 235. Once away, the first support 231, under the tension of the first tension spring 236, keeps the first conductive element 232 in a position away from the normally used stationary contact 213 (open state). The first tension spring 236 ensures reliable opening on the normally used side. At this point, the moving contact assembly has completed the switch from the double-open position to the standby closed position, as... Figure 6 As shown, at this time, the first lever 621 is outside the first opening slot 235, the second lever 622 is inside the second opening slot 245, the normal power moving contact assembly 23 is open, and the standby power moving contact assembly 24 is closed. 4. Switch from the standby closed position to the double open position.

[0059] like Figure 6As shown, in the standby closed position, the first lever 621 is located outside the first opening slot 235, and the second lever 622 is located inside the second opening slot 245. The normally used power moving contact assembly 23 is open, and the standby power moving contact assembly 24 is closed. When the support 62 rotates from the standby closed position to the double open position (e.g., clockwise, opposite to the standby closed position) under the drive of the drive device or handle 30, the second lever 622 rotates in the opposite direction with the support 62 and in the second opening slot 245, pushing the second support member 241 to move in the opposite direction, causing the second conductive member 242 to move away from the standby stationary contact 223. During this process, the second tension spring 246 is stretched and stores energy. When the rotation exceeds the critical point, the elastic potential energy stored in the second tension spring 246 is rapidly released, pulling the standby contact 243 of the second conductive member 242 to accelerate the separation from the standby stationary contact 223. The second lever 622 remains in the second opening slot 245 (deflected on the other side). At the same time, the first lever 621 rotates in the opposite direction with the support 62 and enters the first opening slot 235. After entering, the first lever 621 slides within the first opening slot 235, but does not push the normally closed side (in the opening direction). The first conductive element 232 remains in the open state under the action of the first tension spring 236. Figure 4 As shown, at this time, the first lever 621 is in the first opening slot 235, the second lever 622 is in the second opening slot 245, and the normal power moving contact assembly 23 and the backup power moving contact assembly 24 are both disconnected. 5. Switching between the normal closing position and the standby closing position

[0060] For safety reasons (to avoid simultaneous conduction or switching impact of two power supplies), the switching between the normal closing position and the standby closing position must pass through the double-open position. The logic of controller 42 will ensure that during the switching process, it stays in the double-open position for a sufficient time (adjustable) until the arc is extinguished and the circuit is completely disconnected before continuing to rotate to the target closing position.

[0061] The rotating base 63 is rotatably mounted inside the first housing 11, and the rotating base 63 has a square hole. The two ends of the U-shaped connecting rod 61 are respectively connected to the support 62 and the rotating base 63. When the rotating base 63 rotates, the support 62 is driven to rotate synchronously through the U-shaped connecting rod 61, and then the moving contact assembly is driven to switch between three working positions: the normal closing position, the standby closing position, and the double-open position.

[0062] An arc-extinguishing chamber 26 is disposed within the first housing 11, located between the normal stationary contact 213 and the standby stationary contact 223. The rotation paths of both the normal power moving contact assembly 23 and the standby power moving contact assembly 24 are within the arc-extinguishing chamber 26, serving to extinguish the arc when the circuit is opened. A cylindrical arc-blocking structure 28, made of insulating material, is provided between the normal power terminal 211 and the standby power terminal 221 to increase the creepage distance between the normal power side and the standby power side, thereby improving insulation performance. A U-shaped arc-extinguishing plate 29, made of magnetically conductive material (such as iron sheet), is also provided inside the arc-extinguishing chamber 26 to guide and accelerate the extinguishing of the arc, improving arc-extinguishing efficiency.

[0063] The load terminal assembly 27 includes a load terminal block 271, a first flexible wire 272, and a second flexible wire 273. The load terminal block 271 is embedded in a terminal slot on the surface of the first housing 11 and is used to connect electrical equipment. The load terminal block 271 is electrically connected to the first conductive element 232 of the normal power moving contact assembly 23 via the first flexible wire 272, and is electrically connected to the second conductive element 242 of the standby power moving contact assembly 24 via the second flexible wire 273.

[0064] like Figure 7-8 As shown, the drive device includes an operating mechanism 40 and a transmission assembly 50. The operating mechanism 40 includes a second housing 12, two sets of permanent magnet drive mechanisms 41 and a controller 42 installed in the second housing 12.

[0065] like Figure 9-11 As shown, the transmission assembly 50 is installed inside the second housing 12, and includes a transmission shaft 51, a swing arm 52, and two connecting rods 53. The transmission shaft 51 is a long strip-shaped shaft with a square cross-section to transmit torque. One end of the transmission shaft 51 is connected to the middle of the swing arm 52 (for example, one end of the transmission shaft 51 is fitted into a pre-set square hole in the middle of the swing arm 52 or is directly fixed to the middle of the swing arm 52 by bolts), and the other end of the transmission shaft 51 extends into the first housing 11 and is connected to the square hole of the rotating seat 63 (the other end of the transmission shaft 51 is fitted into the square hole of the rotating seat 63). Both ends of the swing arm 52 are respectively connected to two sets of permanent magnet drive mechanisms 41 one-to-one through a connecting rod 53. Specifically, the moving iron core 412 of each set of permanent magnet drive mechanisms 41 is hinged to one end of the corresponding connecting rod 53 through a hinge pin 417, and the other end of the connecting rod 53 is hinged to the corresponding end of the swing arm 52.

[0066] Two sets of permanent magnet drive mechanisms 41 are used to drive the transmission shaft 51 to rotate, thereby switching the moving contact assembly between the normal closing position, the standby closing position, and the double-open position, and maintaining the state by permanent magnet force in the normal closing position or the standby closing position. The two sets of permanent magnet drive mechanisms 41 are the normal power supply permanent magnet drive mechanism 41a and the standby power supply permanent magnet drive mechanism 41b.

[0067] like Figures 12-17 As shown, each permanent magnet drive mechanism 41 includes a bracket 415, an energy storage spring 413, and an insulating sleeve 416, a permanent magnet core 411, a moving iron core 412, and a coil assembly 414, all respectively disposed within the bracket 415. The bracket 415 has an internal accommodating space, within which the insulating sleeve 416 is disposed. The permanent magnet core 411 is a neodymium iron boron permanent magnet core, fixedly installed at one end inside the insulating sleeve 416. The moving iron core 412 is slidably fitted inside the insulating sleeve 416, with one end of the moving iron core 412 facing the permanent magnet core 411, and the other end sliding out of the bracket 415 and hinged to the connecting rod 53 via a hinge pin 417. The energy storage spring 413 is fitted onto the moving iron core 412, with one end abutting against the bracket 415 and the other end abutting against the hinge pin 417. The coil assembly 414 includes a closing coil 414a and a opening coil 414b. The closing coil 414a and the opening coil 414b are wound sequentially from the inside to the outside of the insulating sleeve 416, and an insulating layer is provided between the closing coil 414a and the opening coil 414b. Both the closing coil 414a and the opening coil 414b are located on the periphery of the moving iron core 412.

[0068] The controller 42 is electrically connected to the closing coil 414a and opening coil 414b of the two sets of permanent magnet drive mechanisms 41, respectively. It is used to collect the status of the main power supply and the backup power supply, and automatically determine and select the working position and status according to the preset logic, and send control signals to control the two sets of permanent magnet drive mechanisms 41 to achieve the closing and opening of the changeover switch. The controller 42 is integrated and installed inside the second housing 12.

[0069] The working process of the drive unit is as follows: like Figure 9 As shown, when the moving contact assembly of the changeover switch is in the normal operating closed position, the permanent magnet core 411 of the normal operating power permanent magnet drive mechanism 41a attracts the moving iron core 412, compresses the energy storage spring 413, and maintains the normal operating closed position. At this time, the attraction force of the permanent magnet core 411 of the normal power supply permanent magnet drive mechanism 41a on the moving iron core 412 is greater than the spring force of the energy storage spring 413. The moving iron core 412 remains in the attracted state and drives the swing arm 52 to rotate through the connecting rod 53. The swing arm 52 drives the transmission shaft 51 to rotate, and the transmission shaft 51 drives the rotating seat 63 to rotate. The rotating seat 63 drives the support 62 to rotate to the normal closing position through the U-shaped connecting rod 61. The first lever 621 on the support 62 drives the normal power supply moving contact assembly 23 to rotate through the first opening slot 235, so that the normal contact 233 contacts and conducts with the normal stationary contact 213. At the same time, the backup power supply permanent magnet drive mechanism 41b is in the de-energized release state. Its moving iron core 412 moves away from the permanent magnet core 411 under the action of the energy storage spring 413 and does not generate driving force. The backup power supply moving contact assembly 24 remains in the open position.

[0070] When the controller 42 issues a command to switch from the normal closing position to the double opening position, the opening coil 414b of the normal power supply permanent magnet drive mechanism 41a is energized in reverse. The opening coil 414b generates a magnetic field opposite to the magnetic field of the permanent magnet core 411, which cancels and weakens the air gap magnetic field. The attraction of the permanent magnet core 411 to the moving iron core 412 is weakened. The spring force of the energy storage spring 413 is greater than the attraction of the permanent magnet core 411 to the moving iron core 412. The moving iron core 412 moves upward under the drive of the energy storage spring 413, which drives the swing arm 52 to rotate in the opposite direction through the connecting rod 53. The swing arm 52 drives the transmission shaft 51 to rotate in the opposite direction. The transmission shaft 51 drives the rotating seat 63 to rotate in the opposite direction. The rotating seat 63 drives the support 62 to rotate to the double opening position through the U-shaped connecting rod 61, so that the normal contact 233 of the normal power supply moving contact assembly 23 is separated from the normal stationary contact 213. During this process, the backup power permanent magnet drive mechanism 41b remains in a de-energized and released state. Its moving iron core 412 is held in the upper position under the action of the energy storage spring 413, without generating driving force. The reverse rotation of the swing arm 52 drives the support 62 to rotate through the transmission shaft 51 and the rotating seat 63, causing the second lever 622 to enter the second opening slot 245, but the backup power moving contact assembly 24 remains in the open state. After the opening is completed, the main power permanent magnet drive mechanism 41a is de-energized, and its moving iron core 412 remains in the upper position under the action of the energy storage spring 413. Figure 10 As shown, both permanent magnet drive mechanisms are in the released state at this time, and the moving contact assembly is in the double-split position.

[0071] When the controller 42 issues a command to switch from the dual-open position to the standby closing position, the closing coil 414a and opening coil 414b of the standby power permanent magnet drive mechanism 41b are simultaneously energized in the forward direction, generating a magnetic field in the air gap that is the same as that of the permanent magnet core 411. As the air gap magnetic field increases, the attractive force on the moving iron core 412 becomes greater than the spring force of the energy storage spring 413. The moving iron core 412 of the standby power permanent magnet drive mechanism moves downward, driving the swing arm 52 to rotate via the connecting rod 53. The swing arm 52 then drives the transmission... When shaft 51 rotates, the transmission shaft 51 drives the rotating seat 63 to rotate. The rotating seat 63 drives the support 62 to rotate to the standby closing position via the U-shaped connecting rod 61. The second lever 622 on the support 62 drives the standby power moving contact assembly 24 to rotate via the second opening slot 245, so that the standby contact 243 makes contact with the standby stationary contact 223 and conducts electricity. The permanent magnet core 411 of the standby power permanent magnet drive mechanism 41b attracts the moving iron core 412, compressing the energy storage spring 413 and maintaining the standby closing position. At this time, the air gap is extremely small, and the attraction force of the permanent magnet core 411 attracting the moving iron core 412 is much greater than the spring force of the energy storage spring 413, which can maintain the standby closing position. Meanwhile, the permanent magnet drive mechanism 41a of the common power supply remains in the de-energized state, and its moving iron core 412 is held in the upper position under the action of the energy storage spring 413, without generating driving force; the rotation of the support 62 causes the first lever 621 to leave the first opening slot 235, and the moving contact assembly 23 of the common power supply remains in the open state (e.g., Figure 11 (The state shown).

[0072] When the controller 42 issues a command to switch from the standby closed position to the double open position, the opening coil 414b of the standby power supply permanent magnet drive mechanism 41b is energized in reverse. The opening coil 414b generates a magnetic field opposite to the magnetic field of the permanent magnet core 411, which cancels and weakens the air gap magnetic field. The attraction of the permanent magnet core 411 to the moving iron core 412 is weakened. The spring force of the energy storage spring 413 is greater than the attraction of the permanent magnet core 411 to the moving iron core 412. The moving iron core 412 moves upward under the drive of the energy storage spring 413, and drives the swing arm 52 to rotate in the opposite direction through the connecting rod 53. The swing arm 52 drives the transmission shaft 51 to rotate in the opposite direction. The transmission shaft 51 drives the rotating seat 63 to rotate in the opposite direction. The rotating seat 63 drives the support 62 to rotate to the double open position through the U-shaped connecting rod 61, so that the standby contact 243 of the standby power supply moving contact assembly 24 is separated from the standby stationary contact 223. During this process, the commonly used power permanent magnet drive mechanism 41a remains in the de-energized and released state. Its moving iron core 412 is held in the upper position under the action of the energy storage spring 413, and does not generate driving force. The reverse rotation of its swing arm 52 drives the support 62 to rotate through the transmission shaft 51 and the rotating seat 63, causing the first lever 621 to enter the first opening slot 235. However, the commonly used power moving contact assembly 23 remains in the open state. After the opening is completed, the backup power permanent magnet drive mechanism 41b is de-energized, and its moving iron core 412 is held in the upper position under the action of the energy storage spring 413. At this time, both sets of permanent magnet drive mechanisms are in the released state, and the moving contact assembly is in the double open position (e.g., Figure 10 (The state shown). Example 2

[0073] The difference between this embodiment and Embodiment 1 lies in the winding order of the closing coil 414a and the opening coil 414b in each group of permanent magnet drive mechanisms 41. In another implementation, the opening coil 414b is wound inside the insulating sleeve 416, and the closing coil 414a is wound outside the opening coil 414b, with an insulating layer between them. This sequence allows the reverse magnetic field to be closer to the moving iron core 412 during opening, making it suitable for applications requiring higher opening speeds. Other structures and operating processes are the same as in Embodiment 1. Example 3

[0074] The difference between this embodiment and Embodiment 1 is that, in this embodiment, each single-pole module further includes a handle 30. One end of the handle 30 is fixed to the rotating base 63, and the other end extends out of the first housing 11 and can swing back and forth, for manually driving the main circuit device 20. When manually operated using the handle 30, the handle 30 drives the rotating base 63, which drives the support 62 to rotate via the U-shaped connecting rod 61. In turn, the rotation of the support 62 drives the moving contact assembly to switch between three working positions: the normal closing position, the standby closing position, and the double-open position.

[0075] When manual operation is required, the controller 42 does not issue commands, and both sets of permanent magnet drive mechanisms 41 are in a de-energized and released state. Their moving iron cores 412 are held in the upper position by the energy storage spring 413. The operator rotates the handle 30, which drives the rotating seat 63 to rotate. The rotating seat 63 drives the support 62 to rotate via the U-shaped connecting rod 61. The first lever 621 and the second lever 622 on the support 62 drive the commonly used power moving contact assembly 23 and the standby power moving contact assembly 24 to rotate via the first opening slot 235 and the second opening slot 245, respectively, realizing manual switching between the commonly used closed position, the standby closed position, and the double-open position. During manual operation, the two sets of permanent magnet drive mechanisms 41 do not participate in active driving. Their connecting rods 53 move passively with the rotation of the swing arm 52. The moving iron core 412 may be pulled by the connecting rods 53 and thus displaced, but the permanent magnet drive mechanisms 41 are never energized and do not generate electromagnetic force.

[0076] Other aspects of this invention that are not detailed herein are all conventional techniques known to those skilled in the art.

[0077] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0078] The scope of protection of this invention is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this invention shall fall within the scope of protection of this invention.

Claims

1. A driving device for a dual power supply changeover switch, used to drive the moving contact assembly of the dual power supply changeover switch to operate, comprising an operating mechanism (40) and a transmission assembly (50); characterized in that: The operating mechanism (40) includes two sets of permanent magnet drive mechanisms (41); the transmission assembly (50) includes a drive shaft (51), a swing arm (52) and two connecting rods (53); one end of the drive shaft (51) is connected to the middle of the swing arm (52) and the other end is connected to the moving contact assembly; both ends of the swing arm (52) are connected to the two sets of permanent magnet drive mechanisms (41) one-to-one through a connecting rod (53); the two sets of permanent magnet drive mechanisms (41) are used to drive the drive shaft (51) to rotate, so as to drive the moving contact assembly to switch between the normal closing position, the standby closing position and the double opening position, and maintain the state by permanent magnet force in the normal closing position or the standby closing position.

2. The driving device according to claim 1, characterized in that: Each set of permanent magnet drive mechanisms (41) includes a bracket (415), an energy storage spring (413), and an insulating sleeve (416), a permanent magnet core (411), a moving iron core (412), a closing coil (414a), and a closing coil (414b) respectively disposed in the bracket (415). The permanent magnet core (411) is installed at one end inside the insulating sleeve (416); The moving iron core (412) is slidably sleeved inside the insulating sleeve (416). One end of the moving iron core (412) is directly opposite the permanent magnet core (411), and the other end slides out of the bracket (415) and is hinged to the connecting rod (53) through the hinge shaft (417). The energy storage spring (413) is sleeved on the moving iron core (412), with one end of the energy storage spring (413) abutting against the bracket and the other end abutting against the hinge shaft (417). The closing coil (414a) and the opening coil (414b) are wound around the outside of the insulating sleeve (416).

3. The driving device according to claim 2, characterized in that: When in the normal closing position or the standby closing position, the permanent magnet core (411) attracts the moving iron core (412) and compresses the energy storage spring (413) to maintain the state; when switching from the double-open position to the normal closing position or the standby closing position, the closing coil (414a) and the opening coil (414b) are simultaneously energized in the forward direction; when switching from the normal closing position or the standby closing position to the double-open position, the opening coil (414b) is energized in the reverse direction, which weakens the attraction of the permanent magnet core (411) to the moving iron core (412), and the energy storage spring (413) resets and drives the moving iron core (412) to move.

4. The driving device according to claim 2, characterized in that: The operating mechanism (40) also includes a controller, which is electrically connected to the closing coil (414a) and the opening coil (414b) of the two sets of permanent magnet drive mechanisms (41) respectively, and is used to collect the power supply status and control the operation of the permanent magnet drive mechanism (41) according to the preset logic.

5. A dual-power transfer switch, characterized in that, It includes a housing (10), a main circuit device (20), and a drive device according to any one of claims 1 to 4; The housing (10) includes a first housing (11) and a second housing (12); The main circuit device (20) is assembled from at least one single-pole module; each single-pole module includes a first housing (11) and a moving contact assembly, a stationary contact assembly, a U-shaped connecting rod (61), a support (62) and a rotating seat (63) respectively installed in the first housing (11); the moving contact assembly and the stationary contact assembly are each provided in two sets and cooperate one-to-one; each set of moving contact assemblies is rotatably arranged and has a contact point, each set of moving contact assemblies rotates back and forth between a closed position and a closed position relative to the corresponding stationary contact assembly, when the closed position the contact point contacts and conducts with the corresponding stationary contact assembly, when the closed position the contact point separates from the corresponding stationary contact assembly; the support (62) is rotatably connected in the first housing (11); the support (62) is provided with two shafts, which are used to drive the two sets of moving contact assemblies to rotate one-to-one respectively, so as to realize the switching of the commonly used closed position, the standby closed position and the double open position, when the double open position both sets of moving contact assemblies are in the open position; The rotating seat (63) is rotatably disposed inside the first housing (11); the two ends of the U-shaped connecting rod (61) are respectively connected to the support (62) and the rotating seat (63); The drive device is installed inside the second housing (12), and the other end of the drive shaft (51) of the drive device extends into the first housing (11) and is connected to the rotating seat (63) in a transmission connection.

6. The dual power supply transfer switch according to claim 5, characterized in that: Each unipolar module also includes a handle (30); one end of the handle (30) is fixed to the rotating base (63), and the other end extends out of the first housing (11) and can swing back and forth.

7. The dual power supply transfer switch according to claim 5, characterized in that: Both sets of moving contact assemblies include a support and a conductive component; the support and the conductive component are made of different materials and are fixed together by riveting.

8. The dual power supply transfer switch according to claim 5, characterized in that: A cylindrical arc-blocking structure (28) is provided between the two sets of stationary contact assemblies.

9. The dual power supply transfer switch according to claim 5, characterized in that: Both the first housing (11) and the second housing (12) are provided with interconnected guide rail mounting grooves (111).

10. The dual power supply transfer switch according to claim 5, characterized in that: The two sets of moving contact assemblies are respectively provided with an opening slot and a tension spring; the two shafts on the support (62) are respectively engaged with the two opening slots to drive the two sets of moving contact assemblies to rotate; the two tension springs are respectively connected between the corresponding moving contact assembly and the support (62) to provide the pulling force for opening and closing the circuit.

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