Dual-power change-over switch with multi-station switching holding function

Abstract

The utility model discloses a dual-power change-over switch with a multi-station switching holding function, which comprises a contact structure arranged on a switch shell, a change-over shaft, a first torsion spring and a second torsion spring, and is characterized in that the change-over shaft comprises a first rod part and a second rod part; the first torsion spring and the second torsion spring are respectively provided with a first positioning end and a second positioning end which are rotatably connected to the switch shell, and a first movable end and a second movable end which are respectively connected with the first rod part and the second rod part; a connecting line between the first positioning end and the second positioning end is a critical inflection point line of the two torsion springs, and the conversion shaft is arranged on one side of the critical inflection point line in a deviated mode; through reasonable design of movement position changes between the two torsion springs and the conversion shaft, the two torsion springs apply elastic acting force which is kept at a common position or a standby position or a double-branch position to the conversion shaft, and the three-station switching function of the conversion switch is realized, so that the safety, the reliability and the compliance in the power supply switching process are ensured; the product use performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a dual-power supply conversion switch with a multi-station switching and holding function. Background Art

[0002] The dual power transfer switch is mainly used in emergency power supply systems. It is a switch that automatically switches the load circuit from one power source to another (backup) power source to ensure continuous and reliable operation of important loads. The existing dual power transfer switch usually has a common position (connecting the common power source) and a backup position (connecting the backup power source). By operating the moving contact to contact with the common contact and the backup static contact, reliable switching between the two positions of the common power source closing and the backup power source closing can be achieved. However, according to different application scenarios, for safety reasons, it is now required to lock the transfer switch in the middle position between the common position and the backup position, that is, the dual power transfer switch is required to have three positions: the common position, the disconnect position (double-off position), and the backup position. When the dual power transfer switch is in the double-off position, safety measures such as padlocks can be implemented to ensure the personal safety of maintenance personnel.

[0003] However, currently, a three-position dual power switch often requires a complex mechanism to achieve switching between the three positions, and three or more active power components are required to trigger the switching and holding actions between different positions, so the operation logic is complicated and cumbersome, and the cost is high. Therefore, those skilled in the art are in urgent need of designing a switch with a simple and stable structure that can switch and hold between the three positions, with reliable operation and in place, and reduce costs. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the dual power conversion switch in the prior art requires a complex mechanism to achieve three-position switching, the operation logic is complicated and cumbersome, and the cost is high.

[0005] In order to solve the above problems, the utility model provides a dual power switch with a multi-position switching and holding function, comprising a contact structure and a conversion shaft arranged on a switch housing, wherein the conversion shaft has a normal position in which the driving contact structure is connected to a normal power source and a standby position in which the standby power source is connected, and a dual split position in which the driving contact structure is disconnected from both the normal power source and the standby power source during the rotation process;

[0006] The switch housing is provided with a first torsion spring and a second torsion spring respectively connected to the conversion shaft, the conversion shaft includes a first rod portion and a second rod portion extending and arranged at an angle; the first torsion spring has a first positioning end rotatably connected to the housing and a first movable end movably connected to the first rod portion; the second torsion spring has a second positioning end rotatably connected to the housing and a second movable end movably connected to the first rod portion; the line connecting the first positioning end and the second positioning end is a critical inflection point line of the two torsion springs, and the conversion shaft deviates from and is arranged on one side of the critical inflection point line;

[0007] When the conversion shaft moves to the double-split position, the first movable end and the second movable end are both located on the upper side of the critical inflection point line, so that the first torsion spring and the second torsion spring are respectively squeezed and symmetrically distributed on both sides of the conversion shaft, and elastic forces of opposite directions and equal magnitude are applied to the conversion shaft through the first rod portion and the second rod portion.

[0008] As a preferred embodiment, the first torsion spring includes two first legs respectively extending and connecting the first positioning end and the first movable end, and a first torsion spring angle formed by the staggered extension of the two first legs; the second torsion spring includes two second legs respectively extending and connecting the second positioning end and the second movable end, and a second torsion spring angle formed by the staggered extension of the two second legs; the first torsion spring angle and the second torsion spring angle remain equal when the conversion shaft is in the double-split position.

[0009] As a preferred solution, when the conversion shaft is in the normal position, it drives the first movable end to cross the critical inflection point line and be below the critical inflection point line, so that the first torsion spring angle formed by the first torsion spring under compression is smaller than the second torsion spring angle.

[0010] As a preferred solution, when the conversion shaft is in the standby position, it drives the second movable end to cross the critical inflection point line and be below the critical inflection point line, so that the second torsion spring angle formed by the second torsion spring under compression is smaller than the first torsion spring angle.

[0011] As a preferred solution, the switch housing includes a mounting panel arranged on one side thereof, and two boss structures arranged on the mounting panel, and the two boss structures are provided with two first connecting holes connecting the first positioning end and the second positioning end.

[0012] As a preferred solution, the conversion shaft has a coupling end passing through the mounting panel, and the first rod portion and the second rod portion are extended and arranged on a side wall of the coupling end at an angle to each other.

[0013] As a preferred solution, the first rod portion and the second rod portion are respectively provided with two second connecting holes for connecting the first movable end and the second movable end.

[0014] As a preferred solution, the switch housing is provided with two detection switches which are respectively located on the movement paths of the first rod and the second rod; when the conversion shaft reaches the normal position, it drives the first rod to trigger one of the detection switches to turn on; when the conversion shaft reaches the standby position, it drives the second rod to trigger the other detection switch to turn on; when the conversion shaft reaches the double-split position, it drives the first rod and the second rod to respectively move away from the two detection switches.

[0015] As a preferred solution, it also includes a driving mechanism installed on one side of the switch housing, and the driving mechanism is connected to the conversion shaft through a gear structure; an installation space suitable for accommodating the first torsion spring and the second torsion spring is formed between the driving mechanism and the installation panel.

[0016] As a preferred solution, the gear structure includes a driving shaft driven by the driving mechanism to perform rotational motion, a driving gear arranged on the driving shaft, and a transmission gear arranged on the coupling end and meshing with the driving gear.

[0017] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0018] 1. In the dual power conversion switch provided by the utility model, when the first active end of the first torsion spring and / or the second active end of the second torsion spring reaches the critical inflection point line, the degree of compression deformation is the largest, and the torsional moment is large enough. Therefore, after the force passes through the critical inflection point line, the original balance is broken, and the torsional moment is released, which triggers the torsion spring to obtain a rotation trend and transmits force and motion to the conversion shaft. In particular, when the conversion shaft moves to the double-split position, the first active end and the second active end are both on the upper side of the critical inflection point line, so that the first torsion spring and the second torsion spring apply elastic forces of opposite directions and equal magnitude to the conversion shaft through the first rod portion and the second rod portion, thereby turning the conversion shaft in The double-split position maintains a static balanced state. By adopting this technical solution, the movement position change between the two torsion springs and the conversion shaft is reasonably designed, so that the conversion shaft is exerted with an elastic force to maintain it in the normal position, the standby position or the double-split position, thereby realizing the three-position switching function of the conversion switch, that is, the dual-power conversion switch can achieve the dual-split purpose of disconnecting the normal power supply and the standby power supply at the same time. This structure is simple, low-cost, and the operation switching is reliable and in place. The core function of the three-position design of this dual-power conversion switch is to ensure the safety, reliability and compliance during the power switching process, reliably guarantee the continuity of the power supply system and the safety of the operator, and improve the product performance.

[0019] 2. In the dual power conversion switch provided by the utility model, during the movement of the conversion shaft switching to the common position, the first active end of the first torsion spring will be driven to cross the critical inflection point line and be located below the critical inflection point line, and the second active end of the second torsion spring will not cross the critical inflection point line. When the first torsion spring passes the critical inflection point line, its torsional torque is released, and an elastic force is applied to the conversion shaft to rotate toward the common position. During this process, the second torsion spring gradually recovers its deformation and is basically not subjected to force. After the conversion shaft drives the contact mechanism to close the circuit at the common position, it is restricted from continuing to rotate. At this time, the conversion shaft is mainly locked in the common position with the help of the elastic force of the first torsion spring. The switching operation is stable and reliable, which can prevent the conversion shaft from rotating in the opposite direction. At the same time, it can enhance the contact pressure of the contacts, reduce arcing and buffer impact, and is more labor-saving to operate.

[0020] 3. In the dual power conversion switch provided by the utility model, the driving mechanism is connected to the conversion shaft through a gear structure, and an installation space suitable for accommodating the first torsion spring and the second torsion spring is formed between the driving mechanism and the installation panel. The installation space provides the required position space for the movement coordination of the two torsion springs and the rotating shaft, and does not occupy the internal space of the switch. With this structural arrangement, the driving mechanism can use an electromagnet or a motor to drive the driving shaft to rotate, so that the motion and force are transmitted between the driving shaft and the conversion shaft through gear transmission, thereby driving the conversion shaft to realize rotation switching and maintenance between the normal position, the standby position and the double position, and the coordinated transmission is reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the drawings required for use in the specific implementation or the description of the prior art will be briefly introduced below.

[0022] Figure 1 It is a structural schematic diagram of the dual power conversion switch of the utility model in the dual split position;

[0023] Figure 2 It is a schematic diagram of the structure of the dual power conversion switch of the utility model in a common position;

[0024] Figure 3 It is a structural schematic diagram of the dual power conversion switch of the utility model in the standby position;

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the dual power conversion switch of the utility model;

[0026] Figure 5 It is a structural schematic diagram of another alternative mode of the dual power conversion switch of the utility model.

[0027] Explanation of the accompanying drawings: 1. switch housing; 10. installation space 11. installation panel; 12. boss structure; 2. conversion shaft; 21. first rod portion; 22. second rod portion; 3. first torsion spring; 31. first positioning end; 32. first movable end; 33. first support leg; 4. second torsion spring; 41. second positioning end; 42. second movable end; 43. second support leg; 5. detection switch; 6. driving mechanism; 61. push rod; 62. guide sleeve; 7. driving shaft; 71. push rod; 8. gear structure; 9. compression spring. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] In the description of the present invention, it should be noted that the terms "first", "second" and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] 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.

[0032] Example

[0033] The present embodiment is described in detail below with reference to the accompanying drawings:

[0034] This embodiment provides Figure 1-Figure 4 A dual power switch with a multi-position switching and holding function is shown, comprising a contact structure and a switching shaft 2 arranged on a switch housing 1, wherein the contact structure comprises a moving contact arranged on the switching shaft 2, and a common static contact and a standby static contact correspondingly arranged in the switch housing 1 and cooperating with the moving contact, wherein the switching shaft 2 has a common position in which the driving contact structure is connected to the common power supply and a standby position in which the standby power supply is connected, and a double split position in which the driving contact mechanism simultaneously disconnects the common power supply and the standby power supply;

[0035] The switch housing 1 is provided with a first torsion spring 3 and a second torsion spring 4 respectively connected to the conversion shaft 2, and the conversion shaft 2 includes a first rod portion 21 and a second rod portion 22 extending and arranged at an angle; the first torsion spring 3 has a first positioning end 31 rotatably connected to the housing and a first movable end 32 movably connected to the first rod portion 21; the second torsion spring 4 has a second positioning end 41 rotatably connected to the housing and a second movable end 42 movably connected to the first rod portion 21; the line between the first positioning end 31 and the second positioning end 41 is the critical inflection point line of the two torsion springs (A in the accompanying drawings indicates the critical inflection point line), and the conversion shaft 2 is deviated from the side of the critical inflection point line, so that the conversion shaft 2 is designed to avoid the coexistence of the two positioning ends. A line; it should be noted that the critical inflection point line here refers to the torsion spring (elastic element) reaching a critical deformation through a critical point (dead point) during the force process, that is, the two ends of the torsion spring under pressure are closest to the compression, and the torsional torque obtained is large enough. Therefore, when the force exceeds the critical point, the torsional torque is used to rotate it, thereby applying an elastic force to the drive rod through the two elastic bodies to maintain it in the normal position, the standby position or the double-split position, especially when the conversion shaft 2 moves to the double-split position, the two active ends are driven to be on the upper side of the critical inflection point line, so that the two elastic bodies are respectively squeezed and symmetrically distributed on both sides of the conversion shaft 2, and elastic forces of opposite directions and equal magnitude are applied to the conversion shaft 2 through the first rod portion 21 and the second rod portion 22.

[0036] The specific action process of the conversion shaft and the two torsion springs is described below:

[0037] refer to Figure 1 When the conversion shaft 2 moves to the double-split position, the first movable end 32 and the second movable end 42 are both located on the upper side of the critical inflection point line, so that the first torsion spring 3 and the second torsion spring 4 are respectively squeezed and symmetrically distributed on both sides of the conversion shaft 2, and the first rod portion 21 and the second rod portion 22 exert elastic forces of the same magnitude and in opposite directions on the conversion shaft 2, that is, Figure 1 The F1 applied by the first torsion spring 3 is equal to the F2 applied by the second torsion spring 4, thereby locking the conversion shaft 2 in the double-open position. At this time, the dual power conversion switch is in a double-open state in which the normal power supply and the backup power supply are disconnected at the same time.

[0038] refer to Figure 2 When the conversion shaft 2 moves to the normal position, it drives the first movable end 32 of the first torsion spring 3 to cross the critical inflection point line and is below the critical inflection point line, and drives the second torsion spring 4 to gradually restore its deformation. The first torsion spring 3 applies an elastic force to the conversion shaft 2 to make a positive rotation trend and maintain it in the normal position. At this time, the dual power conversion switch is in the normal power closing state, that is, connected to the normal power supply.

[0039] refer to Figure 3When the conversion shaft 2 moves to the standby position, it drives the second active end 42 of the second torsion spring 4 to cross the critical inflection point line and is below the critical inflection point line, and drives the first torsion spring 3 to gradually restore its deformation. The second torsion spring 4 applies an elastic force to the conversion shaft 2 to make a reverse rotation trend and maintain it in the standby position. At this time, the dual power conversion switch is in the standby power closing state, that is, the standby power is turned on; the forward rotation and reverse rotation of the conversion shaft in this article refer to the opposite directions of the two rotations, and do not represent its actual rotation direction.

[0040] The above implementation is the core solution of this embodiment. When the first movable end 32 of the first torsion spring 3 and / or the second movable end 42 of the second torsion spring 4 reaches the critical inflection point line, the degree of compression deformation is the largest, and the torsional moment is large enough. Therefore, after the force passes through the critical inflection point line, the original balance is broken, and the torsional moment is released, which triggers the torsion spring to obtain a rotation trend and transmits the force and motion to the conversion shaft 2. In particular, when the conversion shaft 2 moves to the double-split position, the first movable end 32 and the second movable end 42 are both on the upper side of the critical inflection point line, so that the first torsion spring 3 and the second torsion spring 4 apply elastic forces of the same magnitude and in opposite directions to the conversion shaft 2 through the first rod portion 21 and the second rod portion 22. , thereby keeping the conversion shaft 2 in a static balanced state in the double-split position. By adopting this technical solution, by reasonably designing the movement position change between the two torsion springs and the conversion shaft, an elastic force is applied to the conversion shaft 2 to keep it in the normal position, the standby position or the double-split position, thereby realizing the three-position switching function of the conversion switch, that is, the dual-power conversion switch can achieve the dual-split purpose of disconnecting the normal power supply and the standby power supply at the same time. This structure is simple, low-cost, and reliable in operation and switching. The core function of the three-position design of this dual-power conversion switch is to ensure the safety, reliability and compliance during the power switching process, reliably guarantee the continuity of the power supply system and the safety of the operator, and improve the product performance.

[0041] The following combination Figure 1-Figure 3 The specific structures of the first torsion spring and the second torsion spring are described in detail:

[0042] The switch housing 1 includes a mounting panel 11 arranged on one side thereof, and two boss structures 12 arranged on the mounting panel 11, and the two boss structures 12 are provided with two first connecting holes connecting the two positioning ends, so that the first torsion spring 3 and the second torsion spring 4 are positioned and rotated on the mounting panel 11; it is further preferably provided that the conversion shaft 2 has a coupling end passing through the mounting panel 11, and the first rod portion 21 and the second rod portion 22 are extended at an angle to each other on the side wall of the coupling end, and the first rod portion 21 and the second rod portion 22 are respectively provided with second connecting holes for connecting the two movable ends, so that the transmission connection relationship between the first torsion spring 3 and the second torsion spring 4 and the conversion shaft 2 is realized. It can be seen that the two torsion springs are subjected to force and produce elastic deformation during the rotation of the conversion shaft 2, so that the conversion shaft 2 can keep the position locked by the elastic force provided by the two torsion springs when reaching different positions, thereby realizing the three-position switching function of the dual power conversion switch.

[0043] It is further preferred that the first torsion spring 3 includes a first torsion spring angle formed by two first legs 33 extending in a staggered manner; correspondingly, the second torsion spring 4 includes a second torsion spring angle formed by two second legs 43 extending in a staggered manner. Figure 1 As shown, when the conversion shaft 2 is in the double-open position, the first torsion spring 3 and the second torsion spring 4 are respectively compressed and symmetrically distributed on both sides of the conversion shaft 2, so that the first torsion spring angle and the second torsion spring angle remain equal, that is, the conversion shaft 2 is subjected to opposite and equal forces from the first torsion spring 3 and the second torsion spring 4, so that the conversion shaft 2 is locked and maintained in the double-open position through the forces of the first torsion spring 3 and the second torsion spring 4, that is, the dual power conversion switch simultaneously disconnects the normal power supply and the backup power supply.

[0044] like Figure 2 As shown, during the movement of the conversion shaft 2 switching to the common position, the first active end 32 of the first torsion spring 3 will be driven to cross the critical inflection point line and be located below the critical inflection point line, and the second active end 42 of the second torsion spring 4 will not cross the critical inflection point line. When the first torsion spring 3 passes the critical inflection point line, its torsional torque is released, and an elastic force is applied to the conversion shaft 2 to rotate toward the common position. The second torsion spring 4 gradually recovers its deformation during this process and is basically free from force. After the conversion shaft 2 drives the contact mechanism to close at the common position, it is restricted from continuing to rotate (this is because the rotation of the conversion shaft is restricted after the moving contact and the common static contact are closed in place). At this time, the first torsion spring angle formed by the first torsion spring 3 under pressure is smaller than the second torsion spring angle. The conversion shaft 2 is locked and maintained in the common position mainly with the help of the elastic force of the first torsion spring 3. The switching operation is stable and reliable, which can prevent the conversion shaft 2 from rotating in the opposite direction. At the same time, it can enhance the contact pressure of the contacts, reduce arcs and buffer shocks, and make the operation more labor-saving.

[0045] like Figure 3 As shown, when the conversion shaft 2 is in the standby position, it drives the second movable end 42 to cross the critical inflection point line and is located below the critical inflection point line, so that the second torsion spring angle formed by the second torsion spring 4 under pressure is smaller than the first torsion spring angle. The specific process is as follows: during the movement of the conversion shaft 2 switching to the standby position, the second movable end 42 of the second torsion spring 4 will be driven to cross the critical inflection point line and be located below the critical inflection point line, while the first movable end 32 of the first torsion spring 3 has not crossed the critical inflection point line. When the second torsion spring 4 passes the critical inflection point line, its torsional torque is released, and an elastic force is applied to the conversion shaft 2 to rotate toward the standby position. During this process, the first torsion spring gradually recovers its deformation and is basically not subject to force. According to the conversion shaft 2 driving the contact mechanism to close the switch in the standby position, it is also restricted from continuing to rotate. At this time, the conversion shaft 2 is mainly locked and maintained in the standby position with the elastic force of the second torsion spring 4. The switching operation is stable and reliable. This can prevent the conversion shaft 2 from rotating in the opposite direction, and the operation is more labor-saving.

[0046] In this embodiment, two torsion spring structures are preferably used to connect the conversion shaft, but other elastic structures can obviously be used as an alternative. Figure 5 The switch housing 1 is provided with two compression springs 9 which are arranged on both sides of the conversion shaft 2. One end of the two compression springs 9 are two positioning ends which are rotatably connected to the mechanism panel, and the other ends of the two compression springs 9 are two movable ends which are connected to the first rod portion 21 and the second rod portion 22. When the driving rod is switched between the normal position, the standby position and the double split position, it is locked in a certain position by cooperating with the two compression springs, thereby realizing the three-position switching function of the operating mechanism.

[0047] In order to detect the working status information of the dual power conversion switch, the switch housing 1 is provided with two detection switches 5 which are respectively located on the movement paths of the first rod 21 and the second rod 22. Specifically, the two detection switches 5 are arranged on the mounting panel. When the conversion shaft 2 reaches the normal position, it drives the first rod 21 to trigger one of the detection switches 5 to turn on, thereby detecting that the dual power conversion switch is in the normal power closing state; when the conversion shaft 2 reaches the standby position, it drives the second rod 22 to trigger the other detection switch 5 to turn on, thereby detecting that the dual power conversion switch is in the standby power closing state; when the conversion shaft 2 reaches the double-open position, it drives the first rod 21 and the second rod 22 to move away from the two detection switches 5 respectively, thereby detecting that the dual power conversion switch is in the double-open state. This structural setting can realize the working status detection function of the dual power conversion switch through the cooperation of the two detection switches 5 with the first rod 21 and the second rod 22, so that the user can clearly know the working status of the switch and the operation is safer.

[0048] The dual power conversion switch of this embodiment further includes a driving mechanism 6 installed on one side of the switch housing 1. Figure 5 The drive mechanism 6 is connected to the conversion shaft 2 through a gear structure 8, and an installation space 10 suitable for accommodating the first torsion spring 3 and the second torsion spring 4 is formed between the drive mechanism 6 and the installation panel 11. It is further provided that the gear structure 8 includes a drive shaft 7 driven by the drive mechanism 6 to perform rotational motion, a drive gear arranged on the drive shaft 7, and a transmission gear arranged on the coupling end and meshed with the drive gear, and the drive shaft connects the drive mechanism and the conversion shaft. In this embodiment, the drive mechanism 6 is preferably two electromagnet devices relatively arranged on the mechanism bracket, the two electromagnet devices have two push rods 61 that perform linear reciprocating motion, and a guide sleeve 62 is linked and arranged between the two push rods 61, and a guide through hole is arranged on the guide sleeve 62, and the movement direction of the two push rods 61 is perpendicular to the axial direction of the drive shaft 7, and the drive shaft 7 is provided with a push rod 71 extending along its radial direction and penetrating into the guide through hole, and the moving stroke of the push rod 61 can be controlled by the electromagnet device, and then the drive shaft 7 is driven to rotate a certain angle through the cooperation of the guide sleeve 62 and the push rod 71. Obviously, the driving mechanism 6 can also select a method of connecting the motor structure with the driving shaft 7, so that the motor directly drives the driving shaft 7 to rotate. From the above structure, it can be seen that the driving mechanism can use an electromagnet or a motor to drive the driving shaft to rotate, and the driving shaft 7 and the conversion shaft 2 are transmitted through the gear transmission method, so as to drive the conversion shaft to rotate and switch and maintain between the normal position, the standby position and the double position, and the transmission is reliable.

[0049] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A dual power transfer switch with a multi-position switching and holding function, comprising a contact structure and a transfer shaft (2) provided on a switch housing (1), wherein the transfer shaft (2) has a normal position in which the contact structure is driven to connect to a normal power source and a standby position in which the standby power source is connected, and a dual position in which the contact structure is driven to disconnect both the normal power source and the standby power source during rotation; The switch housing (1) is provided with a first torsion spring (3) and a second torsion spring (4) respectively connected to the conversion shaft (2); the conversion shaft (2) comprises a first rod portion (21) and a second rod portion (22) extending at an angle; the first torsion spring (3) comprises a first positioning end (31) rotatably connected to the housing and a first movable end (32) movably connected to the first rod portion (21); the second torsion spring (4) comprises a second positioning end (41) rotatably connected to the housing and a second movable end (42) movably connected to the first rod portion (21); a line connecting the first positioning end (31) and the second positioning end (41) is a critical inflection point line of the two torsion springs, and the conversion shaft (2) deviates from one side of the critical inflection point line; When the conversion shaft (2) moves to the double-split position, the first movable end (32) and the second movable end (42) are driven to be located above the critical inflection point line, so that the first torsion spring (3) and the second torsion spring (4) are respectively squeezed and symmetrically distributed on both sides of the conversion shaft (2), and elastic forces of opposite directions and equal magnitude are applied to the conversion shaft (2) through the first rod portion (21) and the second rod portion (22).

2. The dual power transfer switch with multi-position switching and holding function according to claim 1, characterized in that: The first torsion spring (3) comprises two first legs (33) respectively extending and connecting the first positioning end (31) and the first movable end (32), and a first torsion spring angle formed by staggered extension of the two first legs (33); the second torsion spring (4) comprises two second legs (43) respectively extending and connecting the second positioning end (41) and the second movable end (42), and a second torsion spring angle formed by staggered extension of the two second legs (43); the first torsion spring angle and the second torsion spring angle remain equal when the conversion shaft (2) is in the double-split position.

3. The dual power transfer switch with multi-position switching and holding function according to claim 1, characterized in that: When the conversion shaft (2) is in the normal position, it drives the first movable end (32) to cross the critical inflection point line and be located below the critical inflection point line, so that the first torsion spring angle formed by the first torsion spring (3) in the compressed state is smaller than the second torsion spring angle.

4. The dual power transfer switch with multi-position switching and holding function according to claim 1, characterized in that: When the conversion shaft (2) is in the standby position, it drives the second movable end (42) to cross the critical inflection point line and to be located below the critical inflection point line, so that the second torsion spring (4) formed in a compressed state has a second torsion spring angle smaller than the first torsion spring angle.

5. The dual power transfer switch with multi-position switching and holding function according to any one of claims 1 to 4, characterized in that: The switch housing (1) comprises a mounting panel (11) arranged on one side thereof, and two boss structures (12) arranged on the mounting panel (11), wherein the two boss structures (12) are provided with two first connection holes connecting a first positioning end (31) and a second positioning end (41).

6. The dual power transfer switch with multi-position switching and holding function according to claim 5, characterized in that: The conversion shaft (2) has a coupling end passing through the mounting panel (11), and the first rod portion (21) and the second rod portion (22) are extended and arranged on the side wall of the coupling end at an angle to each other.

7. The dual power transfer switch with multi-position switching and holding function according to claim 6, characterized in that: The first rod portion (21) and the second rod portion (22) are respectively provided with two second connecting holes for connecting the first movable end (32) and the second movable end (42).

8. The dual power transfer switch with multi-position switching and holding function according to claim 1, characterized in that: The switch housing (1) is provided with two detection switches (5) respectively located on the movement paths of the first rod (21) and the second rod (22); when the conversion shaft (2) reaches the normal position, it drives the first rod (21) to trigger one of the detection switches (5) to turn on; when the conversion shaft (2) reaches the standby position, it drives the second rod (22) to trigger the other detection switch (5) to turn on; when the conversion shaft (2) reaches the double-split position, it drives the first rod (21) and the second rod (22) away from the two detection switches (5).

9. The dual power transfer switch with multi-position switching and holding function according to claim 1, characterized in that: The invention also includes a driving mechanism (6) installed on one side of the switch housing (1), and a driving shaft (7) connecting the driving mechanism (6) and the conversion shaft (2), wherein the driving shaft (7) is driven by the driving structure to perform rotational motion, and an installation space (10) suitable for accommodating the first torsion spring (3) and the second torsion spring (4) is formed between the driving mechanism (6) and the installation panel (11).

10. The dual power transfer switch with multi-position switching and holding function according to claim 9, characterized in that: The drive shaft (7) and the conversion shaft (2) are connected via a gear structure (8), and the gear structure (8) comprises a drive gear arranged on the drive shaft (7) and a transmission gear arranged on the coupling end and meshing with the drive gear.

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