Change-over switch

Abstract

The change-over switch comprises a shell, a control electrode and a switch electrode, the control electrode comprises a motor and a gear set, the switch electrode comprises a rotating shaft and two groups of contact mechanisms, the gear set is in transmission connection between an output shaft of the motor and the rotating shaft, and the motor drives the gear set to drive the rotating shaft to rotate and then drive the two groups of contact mechanisms to open and close. The control electrode further comprises a microswitch arranged on one side of the gear set, the microswitch feeds back the switching opening and closing states of the two sets of contact mechanisms, the control electrode further comprises a driven time delay piece, and when the gear set rotates in an opening and closing mode, the driven time delay piece is driven by one gear in the gear set to rotate in a time delay mode. And the driven time delay piece triggers the microswitch after the two groups of contact mechanisms switch the opening and closing states. According to the utility model, the gear set is used in cooperation with the driven time-delay member, so that the driven time-delay member is driven during the idle period of the motor, and the microswitch is triggered only after the states of the two groups of contact mechanisms are switched, thereby preventing signal feedback from being earlier than the state switching of the contact mechanisms, and improving the accuracy of signal feedback.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical appliances, specifically to a changeover switch. Background Technology

[0002] The transfer switch enables the switching of the load line between two power sources. Transfer switches are widely used in various uninterrupted power supply locations to ensure power supply reliability. Generally, the transfer switch achieves the switching between the main and backup power sources by switching the opening and closing of two sets of contact mechanisms. In existing products, the transfer switch is usually equipped with a control pole, which controls the switching of the transfer switch between opening and closing states. At the same time, the control pole also needs to provide disconnection information to the outside.

[0003] Currently, when the motor in the control pole drives the gear set to rotate, the micro switch in the control pole, which is used to provide feedback on the open / closed state, is triggered by the rotating gear set. During this time, the motor experiences an idling period. As a result, while the motor is idling, the open / closed state of the changeover switch has not actually switched, but the micro switch has already been triggered to provide feedback signals, causing the feedback signals to be inconsistent with the actual state. Utility Model Content

[0004] The purpose of this invention is to overcome at least one defect of the prior art and provide a changeover switch.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a changeover switch, including a housing. Inside the housing are a control electrode and a switching electrode. The control electrode includes a motor and a gear set. The switching electrode includes a rotating shaft and two sets of contact mechanisms. The gear set is driven between the output shaft of the motor and the rotating shaft. The motor drives the gear set to rotate the rotating shaft, which in turn drives the two sets of contact mechanisms to open and close. The control electrode also includes a microswitch located on one side of the gear set, which provides feedback on the switching / opening status of the two sets of contact mechanisms.

[0007] The control electrode also includes a driven delay element. When the gear set rotates to close, the driven delay element is driven to rotate by one of the gears in the gear set for a delay, so that the driven delay element triggers the micro switch after the two sets of contact mechanisms switch between the opening and closing states.

[0008] Preferably, a delay structure is provided between one of the gears in the gear set and the driven delay element. The delay structure includes a drive plate and a delay track groove. The drive plate and the two ends of the delay track groove cooperate to drive the driven delay element to rotate. A delay space is reserved between the two ends of the delay track groove for the drive plate to move.

[0009] Preferably, the gear set includes a drive gear, the drive gear, the rotating shaft and the driven delay element are coaxially rotatably assembled, the drive plate is disposed on the drive gear, and the delay track groove is disposed on the driven delay element.

[0010] Preferably, the driven delay element is provided with a push plate, which triggers the button of the micro switch, and the rotation angle of the drive plate is greater than that of the push plate.

[0011] Preferably, the push plate is disposed at the edge of the driven delay member and corresponds to the middle of the delay trajectory groove.

[0012] Preferably, the control electrode further includes a circuit board, the gear set is stacked on the circuit board, the driven delay element rotates in a slot on the circuit board, and the micro switch is connected to the circuit board and located on one side of the slot.

[0013] Preferably, the driven delay element includes a ring body, the through hole of the ring body is used for coaxial assembly with a gear of the gear set, a portion of the edge of one end of the ring body extends axially and then protrudes radially outward to form an arc-shaped convex edge, the arc-shaped convex edge is provided with an arc-shaped delay track groove, and a push plate for triggering a micro switch is provided at the middle edge of the arc-shaped convex edge, the push plate extends axially in a direction away from the ring body.

[0014] Preferably, the gear set includes a drive gear, the drive gear includes a gear body, the circumferential sidewall of the gear body is provided with a gear section, and the shaft center of the gear body protrudes axially to opposite sides to form two round shaft sections for support, one of which is used to drive the rotating shaft to rotate, and the edge of the gear body away from the gear section is provided with a drive plate, the drive plate extends axially opposite the rotating shaft to drive the driven delay member.

[0015] Preferably, the gear set includes at least two gears, one of which is a drive gear and the other gears are transmission gears. The transmission gears are meshed between the drive gear and the output shaft of the motor, and the drive gear is driven by the rotating shaft.

[0016] Preferably, each moving contact assembly is connected to the same rotating shaft by a linkage, and the connection positions of the two linkages to the rotating shaft and the axis of the rotating shaft are not collinear. When the rotating shaft is rotated, the moving contact assemblies in the two sets of contact mechanisms are driven to move in a straight line.

[0017] The changeover switch of this utility model uses a gear set in conjunction with a driven delay element, so that the driven delay element is driven during the motor idling period and the micro switch is triggered only after the two sets of contact mechanisms switch states. This avoids the signal feedback from preceding the state switching of the contact mechanism, ensuring that the control electrode feedback signal matches the actual state and improving the accuracy of the signal feedback.

[0018] Furthermore, driving both the shaft and the driven delay element simultaneously with the drive gear can improve the accuracy of signal feedback and save internal space.

[0019] In addition, the two sets of moving contact assemblies are driven by the same rotating shaft, which reduces the number of rotating shafts used, simplifies the composition and coordination of internal parts, and helps to reduce the overall size. In particular, the same rotating shaft can realize the opening and closing of the two sets of contact mechanisms first, ensuring the safety of use. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the switching electrode structure in this utility model;

[0022] Figure 3 This is a schematic diagram of the control electrode structure in this utility model;

[0023] Figure 4 This is a schematic diagram of the cooperation between the drive gear and the driven delay component in this utility model;

[0024] Figure 5 This is a schematic diagram of the drive gear in this utility model;

[0025] Figure 6 This is a schematic diagram of the driven delay element in this utility model. Figure 1 ;

[0026] Figure 7 This is a schematic diagram of the driven delay element in this utility model. Figure 2 ;

[0027] Figure 8 This is a schematic diagram of the circuit board structure in this utility model;

[0028] Figure label:

[0029] 1-Housing, 2-Switch electrode, 20-Terminal block, 21-Shaft, 22-Moving contact assembly, 221-Contact support, 222-Moving contact, 23-Stationary contact, 24-Linkage element, 25-Reset elastic element, 28-Arc extinguishing chamber, 3-Control electrode, 31-Motor, 32-Gear set, 321-Drive gear, 3211-Gear section, 3212-Round shaft section, 322-Drive plate, 33-Driven delay element, 330-Ring body, 3301-Through hole, 3302-Arc-shaped protrusion, 331-Push plate, 332-Delay track groove, 34-Circuit board, 341-Hollow slot, 35-Micro switch. Detailed Implementation

[0030] The following embodiments, in conjunction with the accompanying drawings, further illustrate specific implementations of the changeover switch of this utility model. The changeover switch of this utility model is not limited to the descriptions in the following embodiments.

[0031] like Figure 1 , 2 As shown, the changeover switch includes a housing 1, within which at least one switch pole 2 is disposed. Each switch pole 2 includes a terminal block 20, a rotating shaft 21, and two sets of contact mechanisms. The terminal block 20 is divided into an input terminal and an output terminal. The rotating shaft 21 is rotatably disposed between the two sets of contact mechanisms. Each set of contact mechanisms is connected between one input terminal and one output terminal, allowing each set of contact mechanisms to be connected to an external power supply via the terminal block. Specifically, one set of contact mechanisms is connected to the main power supply via the terminal block 20, and the other set of contact mechanisms is connected to the backup power supply via the terminal block 20. The two sets of contact mechanisms in each switch pole 2 are spaced apart and opposite each other within the housing 1. Each set of contact mechanisms is connected between one input terminal and one output terminal. The rotating shaft 21 is disposed between the two sets of contact mechanisms. Driving the rotating shaft 21 to rotate causes one set of contact mechanisms to close, and simultaneously drives the other set of contact mechanisms to open.

[0032] The housing 1 also contains a control electrode 3, typically, such as Figure 1 , 3As shown, the control pole 3 includes a circuit board 34, a motor 31, and a gear set 32. The motor 31 is connected to the circuit board 34, and the motor 31 starts or stops rotating according to the control signal issued by the controller on the circuit board 34. The gear set 32 ​​is driven between the rotating shaft 21 and the output shaft of the motor 31, thereby realizing the opening and closing control of the switch pole 2 driven by the control pole 3. Typically, the gear set 32 ​​includes at least two gears, one of which serves as the drive gear 321, and the other gears serve as transmission gears. The transmission gears are meshed between the drive gear 321 and the output shaft of the motor. The output shaft of the motor first drives the gear set 32 ​​to rotate, and the drive gear 321 then drives the rotating shaft 21 in the switch pole 2 to rotate. The rotating shaft 21 drives the two sets of contact mechanisms in the switch pole 2 to perform opening and closing actions. The circuit board 34 is also equipped with a micro switch 35, which is used to provide feedback on the opening and closing status of the two sets of contact mechanisms. The number of micro switches 35 can be two or three. The controller of the circuit board 34 obtains the opening and closing status of the two sets of contact mechanisms based on the status of the micro switches 35. Typically, the micro switches 35 are located on one side of the gear set 32 ​​and are triggered by the gear set 32. The opening and closing of the micro switches 35 is used to provide feedback on whether the two sets of contact mechanisms have completed the switching of opening and closing status. For example, when the micro switch 35 is triggered, it indicates that the contact mechanism for controlling the backup power supply has been opened and the contact mechanism for controlling the main power supply has been closed. When the micro switch 35 is closed, it indicates that the contact mechanism for controlling the main power supply has been opened and the contact mechanism for controlling the backup power supply has been closed.

[0033] The improvement of this application lies in that the control electrode 3 also includes a driven delay element 33. The driven delay element 33 is driven to rotate by a gear in the gear set 32 ​​after a delay, so that the driven delay element 33 triggers the micro switch 35 only after the two sets of contact mechanisms have switched between open and closed states. In this way, the gear set 32, in cooperation with the driven delay element 33, ensures that the driven delay element 33 is driven during the idling period of the motor 31, and triggers the micro switch 35 only after the two sets of contact mechanisms have switched states. This avoids the signal feedback occurring before the state switching of the contact mechanism, ensuring that the feedback signal of the control electrode 3 matches the actual state and improving the accuracy of the signal feedback.

[0034] Specifically, a delay structure is provided between one gear in the gear set 32 ​​and the driven delay member 33. The delay structure includes a drive plate 322 and a delay track groove 332. The drive plate 322 slides through the delay track groove 332, and the driven delay member 33 is driven to rotate by the engagement of the two ends of the drive plate 322 and the delay track groove 332. A delay space is reserved between the two ends of the delay track groove 332 for the drive plate 322 to move. Alternatively, the delay structure includes a drive plate 322 and two delay bosses. The drive plate 322 moves between the two delay bosses. Each time, the drive plate 322 engages with one of the delay bosses to drive the driven delay member 33 to rotate. A delay space is reserved between the two delay bosses for the drive plate 322 to move. When the drive plate 322 is mounted on the gear, the driven delay member 33 is provided with a corresponding delay track groove 332 or delay boss. When the drive plate 322 is mounted on the driven delay member 33, the gear is provided with a corresponding delay track groove 332 or delay boss. The delay space is used to compensate for the travel of the motor 31 when it is idling.

[0035] like Figure 1 As shown, the gear set 32 ​​includes at least two meshing gears. One gear serves as a drive gear 321 for driving connection with the rotating shaft 21, while the remaining gears serve as transmission gears. One or more transmission gears are meshed between the drive gear 321 and the output shaft of the motor 31. The driven delay element 33 is rotatably assembled and is driven to rotate by one of the gears in the gear set 32, either directly or indirectly. The driven delay element 33 triggers the button of the micro switch 35. Preferably, the driven delay element 33, the drive gear 321, and the rotating shaft 21 are coaxially rotatably assembled, and the driven gear 321 drives the driven delay element 33 to rotate. Both the driven delay element 33 and the rotating shaft 21 are driven by the same drive gear 321, which reduces the transmission process between gears, improves the accuracy of signal feedback, and saves internal space.

[0036] Specifically, the drive gear 321 is provided with a drive plate 322, which drives the driven delay member 33 to rotate after a delay. The driven delay member 33 is provided with a push plate 331, which is preferably located at the edge of the driven delay member 33. The push plate 331 triggers the button of the micro switch 35, so that the rotation angle of the drive plate 322 is greater than the rotation angle of the push plate 331, thereby making the travel of the drive plate 322 greater than the travel of the push plate 331. By forming a travel difference between the push plate 331 and the drive plate 322, it is ensured that the rotation of the driven delay member 33 lags behind the rotation of the drive gear 321.

[0037] Preferably, the driven delay member 33 is provided with a delay trajectory groove 332, and the drive plate 322 slides through the delay trajectory groove 332. When the drive plate 322 abuts against both ends of the delay trajectory groove 332, it can drive the driven delay member 33 to rotate. The push plate 331 is located in the middle of the delay trajectory groove 332, which has the advantages of simple structure, small space occupation and convenient cooperation. Of course, the driven delay member 33 can also be provided with two delay bosses instead of the delay trajectory groove 332, so that the drive plate 322 can move between the two delay bosses. When the drive plate 322 abuts against one of the delay bosses, it can drive the driven delay member 33 to rotate. The push plate 331 is still located at the edge of the driven delay member 33 and corresponds to the middle of the movement trajectory of the drive plate 322. However, the cooperation between the delay boss and the drive plate 322 makes the thickness of the driven extension member and the drive gear 321 larger when they are stacked, and occupies more space.

[0038] Combination Figure 1-8 A specific embodiment of a changeover switch is provided.

[0039] like Figure 1 , 3 As shown, the changeover switch includes a housing 1, inside which a control electrode 3 and at least one switch electrode 2 are provided. The control electrode 3 includes a circuit board 34, a motor 31, a gear set 32, and a driven delay element 33. The circuit board 34 is laid along the inner wall of the housing 1. The gear set 32 ​​and the driven delay element 33 are rotated and stacked on the circuit board 34. A micro switch 35 is provided on the side of the circuit board 34 corresponding to the gear set 32. The micro switch 35 is used to provide feedback on the opening and closing status of the two sets of contact mechanisms. The controller on the circuit board 34 obtains the opening and closing status of the two sets of contact mechanisms according to the status of the micro switch 35. When the driven delay element 33 is driven to rotate by the gear set 32, the driven delay element 33 triggers the button of the micro switch 35. The motor 31 is located near the edge of the housing 1. A clearance area is provided at the position corresponding to the motor 31 to avoid mutual interference between the motor 31 and the circuit board 34.

[0040] In this embodiment, the gear set 32 ​​includes a drive gear 321 and multiple transmission gears. The drive gear 321 is coaxially and rotatably assembled with the driven delay member 33. A drive plate 322 is provided on the drive gear 321. The driven delay member 33 is provided with a delay track groove 332 through which the drive plate 322 slides. When the drive gear 321 is driven to rotate, the delay track groove 332 provides rotation space for the drive plate 322. When the drive plate 322 abuts against both ends of the delay track groove 332, it can drive the driven delay member 33 to rotate. This realizes that the driven delay member 33 is driven by the drive gear 321 with a delay. The driven delay member 33 is provided with a push plate 331 for triggering the micro switch 35. The push plate 331 is located at the edge of the driven delay member 33 and corresponds to the middle of the delay track groove 332. This makes the moving stroke of the push plate 331 less than the moving stroke of the drive plate 322, so as to avoid the micro switch 35 being triggered when the gear set 32 ​​just starts to rotate.

[0041] Preferred, such as Figure 8 As shown, the circuit board 34 has a hollow slot 341, the micro switch 35 is disposed on one side of the hollow slot 341, and the driven delay element 33 is rotatably assembled in the hollow slot 341 of the circuit board 34. Furthermore, the circuit board 34 can also have a clearance area at the position corresponding to the motor 31, thereby avoiding interference between the driven delay element 33 and the motor 31 during operation.

[0042] Combination Figure 3 , 6 7 provides a slave delay element 33 applied in this embodiment, such as Figure 6 , 7 As shown, the driven delay member 33 includes an annular body 330. The through hole 3301 of the annular body 330 is used for coaxial assembly with a gear of the gear set 32. That is, the annular body 330 is coaxially assembled with the drive gear 321. A portion of the edge at one end of the annular body 330 extends axially and then protrudes radially outward to form an arc-shaped protrusion 3302. The arc-shaped protrusion 3302 partially surrounds one side of the annular body 330 and forms a stepped structure for the driven delay member 33 in the axial direction. The arc-shaped protrusion 3302 has an arc-shaped delay trajectory groove 332, and the delay trajectory groove 332 is concentric with the through hole 3301 of the annular body 330. The middle edge of the arc-shaped protrusion 3302 is provided with a push plate 331 for triggering the micro switch 35. The push plate 331 extends axially in a direction away from the annular body 330.

[0043] In this embodiment, the gear set 32 ​​includes a drive gear 321 and multiple transmission gears. The transmission gears can employ existing technology, allowing them to mesh between the output shaft of the motor 31 and the drive gear 321. Referring to the figures, a drive gear 321 applied in this embodiment is provided, such as... Figure 3 ,5 As shown, the drive gear 321 includes a gear body. A gear portion 3211 is provided on the circumferential sidewall of the gear body. Two round shaft portions 3212 are formed by protruding from the center of the gear body along the axial direction to opposite sides. The two round shaft portions 3212 are mainly used to support the drive gear 321 to rotate. One of the round shaft portions 3212 is also used to drive the rotating shaft 21 to rotate. It is provided with a square shaft hole for connecting the rotating shaft 21. The other round shaft portion 3212 is rotated and assembled through the through hole 3301 of the driven delay member 33. A drive plate 322 is provided on the edge of the gear body away from the gear portion 3211. The drive plate 322 extends axially away from the rotating shaft 21 to drive the driven delay member 33. That is, the drive plate 322 slides through the delay track groove 332 and drives the driven delay member 33 to rotate through the delay track groove 332.

[0044] The internal space of the housing 1 of the changeover switch can be divided into at least two parallel assembly spaces by a partition plate. One assembly space is used to set the control pole 3, and the other assembly space is used to set the switch pole 2. Alternatively, the control pole 3 and the switch pole 2 each have their own housings, and the control pole 3 and the switch pole 2 are assembled side by side through their respective housings. The housings of the control pole 3 and the switch pole 2 together form the housing 1 of the changeover switch. Alternatively, the control pole 3 and at least one switch pole 2 are arranged side by side in the same housing 1.

[0045] like Figure 1-3 As shown, the switching pole 2 in the changeover switch can adopt existing technology, that is, the switching pole 2 includes wiring terminals (not shown), two sets of contact mechanisms and a rotating shaft 21. The wiring terminals are divided into paired inlet terminals and outlet terminals. Each set of contact mechanisms is connected to an external power supply through the connected inlet and outlet terminals, thereby connecting or disconnecting the external power supply. Of course, the two sets of contact mechanisms can share a single outlet terminal, that is, the two sets of contact mechanisms are connected to the same outlet terminal, which can reduce the number of wiring terminals used, thereby reducing costs and shrinking the size.

[0046] like Figure 2 As shown, each contact mechanism includes a moving contact assembly 22 and a stationary contact assembly that cooperate with each other. Each moving contact assembly 22 includes a contact support 221 and a moving contact 222. The moving contact 222 is disposed through the mounting cavity in the middle of the contact support 221, so that both ends of the moving contact 222 serve as moving contact parts. A contact spring is provided between the middle of the moving contact 222 and the contact support 221, and the contact spring provides contact pressure to the moving contact 222. The stationary contact assembly includes two stationary contacts that are spaced apart, and each stationary contact is spaced apart from one moving contact part of the moving contact 222.

[0047] The rotating shaft 21 is rotatably disposed between the two sets of contact mechanisms. The contact support 221 of each moving contact assembly 22 is driven to the rotating shaft 21 through a linkage 24. The two hinge points of the linkage 24 connecting the two sets of moving contact assemblies 22 on the rotating shaft 21 are not collinear with the axis of the rotating shaft 21. The rotating shaft 21 is connected to another round shaft 3212 on the drive gear 321 in the control pole 3. The rotating shaft 21 drives the two sets of moving contact assemblies 22 to move in a straight line. In this embodiment, the two moving contact assemblies 22 are driven by the same rotating shaft 21. The rotating shaft 21 can adopt the existing technology, that is, the rotating shaft 21 can adopt a split structure or an integral structure. In this embodiment, the rotating shaft 21 is preferably a split structure.

[0048] Furthermore, each contact support 221 is also connected to a reset elastic element 25. Figure 2 In the middle, the reset elastic element 25 is elastically connected between the plug-in part of the contact support 221 and the outer shell 1. The reset elastic element 25 and the linkage element 24 connected on the same contact support 221 together form a set of drive components. The drive components convert the circumferential rotation of the rotating shaft 21, so that the contact mechanism performs opening and closing movements along a straight line.

[0049] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used during use. They are only for ease of description and do not indicate that the device or component referred to must have a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating relative importance.

[0050] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the protection scope of the present invention.

Claims

1. A changeover switch, comprising a housing (1), wherein a control pole (3) and a switch pole (2) are provided within the housing (1). The control pole (3) comprises a motor (31) and a gear set (32). The switch pole (2) comprises a rotating shaft (21) and two sets of contact mechanisms. The gear set (32) is connected between the output shaft of the motor (31) and the rotating shaft (21). The motor (31) drives the gear set to rotate the rotating shaft (21), which in turn drives the two sets of contact mechanisms to open and close. The control pole (3) further comprises a micro switch (35) disposed on one side of the gear set (32). The micro switch (35) provides feedback on the switching and opening / closing status of the two sets of contact mechanisms. Its features are: The control pole (3) also includes a driven delay element (33). When the gear set (32) is opening and closing, the driven delay element (33) is driven to rotate by one of the gears in the gear set (32) for a delay, so that the driven delay element (33) triggers the micro switch (35) after the two sets of contact mechanisms switch the opening and closing states.

2. The changeover switch according to claim 1, characterized in that: A delay structure is provided between one of the gears in the gear set (32) and the driven delay element (33). The delay structure includes a drive plate (322) and a delay track groove (332). The drive plate (322) and the two ends of the delay track groove (332) cooperate to drive the driven delay element (33) to rotate. A delay space is reserved between the two ends of the delay track groove (332) for the drive plate (322) to move.

3. The changeover switch according to claim 2, characterized in that: The gear set (32) includes a drive gear (321), the drive gear (321), the rotating shaft (21) and the driven delay member (33) are coaxially rotated and assembled, the drive plate (322) is disposed on the drive gear (321), and the delay track groove (332) is disposed on the driven delay member (33).

4. The changeover switch according to claim 3, characterized in that: The driven delay member (33) is provided with a push plate (331), which triggers the button of the micro switch (35), and the rotation angle of the drive plate (322) is greater than the rotation angle of the push plate (331).

5. The changeover switch according to claim 4, characterized in that: The push plate (331) is disposed on the edge of the driven delay member (33) and corresponds to the middle of the delay trajectory groove (332).

6. The changeover switch according to claim 1, characterized in that: The control electrode (3) also includes a circuit board (34), the gear set (32) is stacked on the circuit board (34), the driven delay element (33) rotates in the slot (341) opened on the circuit board (34), and the micro switch (35) is connected to the circuit board (34) and located on one side of the slot (341).

7. The changeover switch according to claim 1, characterized in that: The driven delay element (33) includes an annular body (330). The through hole (3301) of the annular body (330) is used for coaxial assembly with a gear of the gear set (32). A portion of the edge of one end of the annular body (330) extends axially and then protrudes radially outward to form an arc-shaped convex edge (3302). The arc-shaped convex edge (3302) has an arc-shaped delay track groove (332). A push plate (331) for triggering a micro switch (35) is provided at the middle edge of the arc-shaped convex edge (3302). The push plate (331) extends axially in a direction away from the annular body (330).

8. The changeover switch according to claim 1, characterized in that: The gear set (32) includes a drive gear (321), the drive gear (321) includes a gear body, the circumferential sidewall of the gear body is provided with a gear section (3211), the shaft center of the gear body protrudes axially to opposite sides to form two round shaft sections (3212) for support, one of the round shaft sections (3212) is used to drive the rotating shaft (21) to rotate, the edge of the gear body away from the gear section (3211) is provided with a drive plate (322), the drive plate (322) extends axially away from the rotating shaft (21) for driving the driven delay member (33).

9. The changeover switch according to claim 1, characterized in that: The gear set (32) includes at least two gears, one of which is a drive gear (321) and the other gears are transmission gears. The transmission gears are meshed between the drive gear (321) and the output shaft of the motor (31). The drive gear (321) is driven to the rotating shaft (21).

10. The changeover switch according to claim 1, characterized in that: Each moving contact assembly (22) is connected to the same rotating shaft (21) by a linkage (24), and the connection positions of the two linkages (24) and the rotating shaft (21) and the axis of the rotating shaft (21) are not collinear. When the rotating shaft (21) is rotated, the moving contact assembly (22) in the two sets of contact mechanisms is driven to move in a straight line.

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