Handover mechanism

Abstract

The application provides a hand-automatic switching mechanism and belongs to the technical field of valves. The hand-automatic switching mechanism solves the problem of poor stability of the existing multipurpose hand-automatic valve actuator switching control mode. The hand-automatic switching mechanism comprises a driving gear and a transmission part. The hand-automatic switching mechanism further comprises a holder and a shell. The shell is provided with a magnet II. The holder is composed of a bottom and a pushing part. A plurality of notches are formed in the pushing part. Each notch is provided with a movable part. Each side surface of the inner hole of the driving gear is a limiting surface. The minimum distance between each limiting surface and the outer side surface of the transmission part is smaller than the maximum width of the movable part. A plurality of magnets I corresponding to the notches are fixed on the driving gear. The hand-automatic switching mechanism has the advantage of good stability.

Description

Technical Field

[0001] This invention belongs to the field of valve technology and relates to a manual / automatic switching mechanism, particularly to a manual / automatic switching mechanism for an electrically controlled valve. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium. They are widely used in pipeline systems. Actuators are an essential component of automatic control systems. Their function is to receive control signals from the controller, change the magnitude of the controlled medium, and thus maintain the controlled variable at the required value or within a certain range. To prevent valve malfunction due to actuator failure, a manual control function is often required on the valve.

[0003] For example, a multi-purpose manual / automatic valve actuator has been designed and a Chinese patent has been applied for, with application number 202120988369.3 and publication number CN214699425U. This multi-purpose manual / automatic valve actuator includes an upper housing, a lower housing, an electric transmission assembly, a manual actuation component, and a sensor switch circuit board. The electric transmission assembly, the manual actuation component, and the sensor switch circuit board are assembled within the mounting space formed by the upper and lower housings. The manual actuation component includes a valve stem connection. The device includes a shaft, a spring, a manual / automatic connecting shaft, a switch cam, a limit connecting shaft, and a handle. The lower end of the valve stem connecting shaft has a valve groove for the valve stem to insert into, and the upper end has a base for the spring to support it. The manual / automatic connecting shaft has a hollow structure and is sleeved on the valve stem connecting shaft and circumferentially fixed. The outer side of the manual / automatic connecting shaft has a splined part that cooperates with the clutch of the electric transmission assembly. The switch cam is sleeved on the manual / automatic connecting shaft and circumferentially fixed. The limit connecting shaft is inserted into the upper end of the manual / automatic connecting shaft and circumferentially fixed. The handle is sleeved on the upper end of the limit connecting shaft and circumferentially fixed.

[0004] This multi-purpose manual / automatic valve actuator, in electric control mode, allows the manual / automatic connecting shaft to engage with the electric transmission assembly via splines and internal gears for driving. When energized, it rotates both the electric automatic control handle and the valve stem connecting shaft. For manual control, pressing down the handle compresses the spring, disengaging the manual / automatic connecting shaft from the electric transmission assembly. This eliminates resistance from the electric transmission assembly during manual rotation.

[0005] However, when switching control modes, especially from manual to electric control, the manual-automatic connecting shaft rotates circumferentially relative to the electric transmission assembly after axial movement relative to the assembly. This makes it difficult to ensure that the spline and internal gear maintain their aligned position. Consequently, it cannot guarantee that the spline and internal gear can properly reset and mesh under the spring force. This is especially true when the spring experiences elastic fatigue after long-term use, making it even more difficult to guarantee the stability of switching from manual to electric control. Summary of the Invention

[0006] The purpose of this invention is to address the aforementioned problems in the prior art by proposing a manual / automatic switching mechanism that solves the problem of poor stability in the switching control method of existing multi-purpose manual / automatic integrated valve actuators.

[0007] The objective of this invention can be achieved through the following technical solutions: A manual / automatic switching mechanism, mounted on a housing, includes a coaxially arranged annular drive gear and a transmission component passing through the drive gear. The transmission component is used for transmission connection with the valve stem and operating handle of a valve. The mechanism is characterized by further including a retainer made of magnetic material. A magnet is fixed to the housing opposite the retainer. The retainer consists of an annular plate-shaped bottom and a cylindrical pushing part integrally formed with the bottom. The pushing part is located between the drive gear and the transmission component, and has several notches. Each notch contains a movable component made of magnetic material. The inner cross-section of the gear is a regular polygon, and each side of the inner hole of the driving gear is a limiting surface. The minimum distance between each limiting surface and the outer side of the transmission component is less than the maximum width of the movable component. When the driving gear rotates circumferentially, the retainer can block each movable component under the magnetic attraction of the second magnet and move the movable component relative to the driving gear around the axis of the driving gear until it is stuck between the inner wall of the driving gear and the outer wall of the transmission component. Several magnets are fixed on the driving gear, each corresponding to a notch. Each movable component can be stuck between two adjacent limiting surfaces and separated from the transmission component under the magnetic attraction of the first magnet.

[0008] This manual / automatic switching mechanism is used in electrically controlled valves to switch between manual and electric control modes. During actual installation, the housing is fixed to the valve body, and the drive gear is connected to the output of the drive motor. The drive motor can drive the drive gear to rotate circumferentially. The transmission component can be a gear connected to the valve stem, or a valve sleeve directly and circumferentially fixed to the valve stem, etc.

[0009] In the default state, the magnet generates a magnetic attraction between a pair of moving parts, causing several moving parts to engage with each other between two adjacent limiting surfaces, i.e., at each corner of the regular polygon inside the drive gear's inner hole. Because the corners are farther from the transmission components than the limiting surfaces, the moving parts engaged in the corners are always separated from the transmission components. There are no other structures connecting the drive gear and the transmission components; they are independent of each other. The driving force for manually rotating the valve stem is only transmitted to the transmission components and not to the drive gear, thus disconnecting the drive motor's transmission from the manual transmission. This avoids the resistance from the drive motor when manually rotating the valve stem, making manual rotation smoother and easier.

[0010] When electric drive is required, the drive motor drives the drive gear to rotate circumferentially, causing magnet one fixed on the drive gear and the movable part attracted by magnet one to rotate synchronously. Meanwhile, the cage and its pusher are attracted by magnet two fixed on the housing and remain stationary. The recessed sidewall of the pusher will approach the corresponding movable part until they abut against each other. The pusher of the cage then blocks each movable part, causing it to overcome the magnetic attraction of magnet one and move away from it, moving along one of the limiting surfaces. Because the minimum distance between the limiting surface and the outer wall of the transmission component is less than the maximum width of the movable part, the moved movable part is locked between the upper limiting surface of the drive gear and the transmission component. Thus, the drive gear and the transmission component are circumferentially fixed through the locked movable part. The drive gear can drive the transmission component to rotate synchronously circumferentially, thereby driving the valve stem connected to the transmission component to rotate, achieving electric control of the valve opening. Here, to ensure that the cage can push the movable part to move against the magnetic attraction of magnet one, the magnetic attraction of magnet two can be greater than that of magnet one when selecting magnet one and magnet two. This will allow the cage to push the movable part to move. After the drive gear, moving parts and transmission parts rotate synchronously, the powerful driving force of the drive motor enables the moving parts to act on the recessed sidewall of the push part, causing the cage to overcome the magnetic attraction of the second magnet and rotate synchronously with the drive gear, moving parts and transmission parts.

[0011] After the electric drive ends, the moving part is attracted by magnet one and moves to the angle formed between the two adjacent limiting surfaces. The cage is attracted by magnet two again and returns to the default state.

[0012] In this manual / automatic switching mechanism, magnet one attracts the movable part to separate the drive gear and the transmission component. Magnet two, fixed to the housing, attracts the retainer, allowing the retainer to rotate circumferentially relative to the drive gear. This, in turn, pushes the movable part to move and engage the drive gear and the transmission component. In other words, the engagement and disengagement of the drive gear and the transmission component are achieved through the cooperation of magnet one and the movable part, and magnet two and the retainer. Compared to existing technologies, there is no axial misalignment between the drive gear and the transmission component during drive mode switching, avoiding the poor switching stability caused by misalignment during axial reset. Furthermore, the magnetic attraction of the magnets avoids the elastic fatigue problem that occurs after spring use, ensuring the stability of control mode switching.

[0013] Furthermore, the side walls of the inner hole of the regular polygonal drive gear, i.e., the limiting surfaces, are all flat, and the distance between them and the outer side of the transmission component gradually decreases. This allows the cage to block the moving component, and after the moving component moves along the limiting surface, it can be stably locked between the limiting surface and the transmission component, thus ensuring the stability of control mode switching and electric drive. At the same time, the flat limiting surface and the transmission component only limit the unidirectional movement of the moving component, allowing the moving component to smoothly reset under the magnetic attraction of magnet one after the electric drive ends, further ensuring the stability of control mode switching. The ring-shaped bottom of the cage allows the cage to correspond and cooperate with magnet two after rotating to any angle as the moving component rotates, thus ensuring operational stability.

[0014] In the aforementioned manual / automatic switching mechanism, several recessed limiting slots are evenly distributed on the outer surface of the transmission component around the axis of the drive gear. After the movable component moves around the axis of the drive gear, one side of the movable component can be engaged in the limiting slot. The recessed limiting slots on the transmission component, with the movable component partially engaged, make the engagement between the movable component and the transmission component more stable and less prone to disengagement during electric drive, ensuring stability when switching to electric drive. When manual drive is required, the transmission component needs to be rotated slightly in the opposite direction, causing the movable component engaged in the limiting slot to move in the opposite direction, increasing the distance between the outer surface of the movable component and the limiting surface. The movable component can then quickly disengage from the limiting slot and move back to its initial position under the magnetic attraction of the magnet. The movable component is no longer engaged between the transmission component and the limiting surface, and the transmission component can rotate independently relative to the movable component and the drive gear, achieving manual control.

[0015] In the aforementioned manual / automatic switching mechanism, the movable component has a circular cross-sectional shape, and the bottom surface of the limiting port is an arc surface. The circular cross-sectional shape of the movable component allows it to roll, making it easier to push and reset. This ensures smooth control mode switching, stability during drive, and reliable component reset, thereby guaranteeing the stability of control mode switching. The shape of the movable component, combined with the limiting port, facilitates movement while maintaining stability in the connection between the movable component and the transmission component when switching to electric drive.

[0016] In the aforementioned manual / automatic switching mechanism, the second magnet and the movable component are positioned on opposite sides of the bottom of the retainer. The annular bottom of the retainer provides a position for the second magnet to apply magnetic force and also shields the magnetic field of the second magnet, preventing the second magnet from affecting the position and movement of the movable component, which can also be magnetically attracted. This dual-purpose design ensures smooth and stable movement of the movable component, thereby guaranteeing the stability of the control mode switching.

[0017] In the aforementioned manual / automatic switching mechanism, recessed mounting holes are provided on the outer wall of the drive gear at each corner position corresponding to the regular polygon of the drive gear's inner hole. The number of magnets is the same as the number of mounting holes, and they are fixed in each mounting hole in a one-to-one correspondence. Designing the magnets as several points ensures the concentration of magnetic attraction, avoids affecting the movement and position of moving parts, and ensures the stability of the control mode switching.

[0018] In the aforementioned manual / automatic switching mechanism, the bottom of the cage is located between the end of the drive gear and the housing, and an annular gasket is provided between the bottom and the drive gear and / or between the bottom and the housing. The gasket serves to reduce friction and wear, and to reduce the influence of forces other than the magnetic attraction of magnet II on the rotation of the cage, allowing the cage to rotate more smoothly with the drive gear and reducing energy consumption.

[0019] In the aforementioned manual / automatic switching mechanism, the side of the transmission component has a protruding annular retaining ring. The retaining ring and the aforementioned bottom are located at both ends of the drive gear, and the retaining ring and the bottom can respectively block the ports at both ends of the drive gear. By relying on the retaining ring and the bottom to restrict the axial position of the moving component, the moving component is ensured to be located between the inner wall of the drive gear and the outer wall of the transmission component, thereby ensuring operational stability.

[0020] In the aforementioned manual / automatic switching mechanism, the movable component is either cylindrical or spherical. A spherical movable component can roll freely between the drive gear and the transmission component, resulting in smoother movement, while the cylindrical shape can be prevented from tipping over by the limiting position of the cage pusher, thus ensuring the stability of the movable component during operation.

[0021] Compared with existing technologies, this manual / automatic switching mechanism has the following advantages: 1. This manual / automatic switching mechanism achieves the engagement and disengagement between the drive gear and the transmission component through the cooperation of magnet one and the moving part, and magnet two and the cage. Compared with the prior art, there is no misalignment of the axial position between the drive gear and the transmission component when switching the drive mode, which avoids the situation of poor switching stability caused by the position not being aligned when axially resetting. In addition, the magnetic attraction of the magnet can avoid the problem of elastic fatigue after the spring is used, thus ensuring the stability of the control mode switching.

[0022] 2. Without electric drive, the user can directly rotate the handle and other components to manually adjust the valve opening of this manual / automatic switching mechanism. There is no need to perform any other operations such as pressing in addition to circumferential rotation. This makes the operation more convenient and less strenuous. In addition, there is no need to reserve additional space in the housing for the axial movement of the valve stem and other components, which reduces the axial dimension of the entire mechanism. This allows the manual / automatic switching mechanism to be easily installed and operated even in places with limited installation space.

[0023] 3. The manual / automatic switching process of this mechanism is completed automatically without any additional operation, which makes it convenient for users. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the manual / automatic switching mechanism.

[0025] Figure 2 This is a cross-sectional structural schematic diagram of Embodiment 1 of the manual / automatic switching mechanism.

[0026] Figure 3 This is a schematic diagram of the cage structure in Embodiment 1 of the manual / automatic switching mechanism.

[0027] Figure 4 This is a schematic diagram of the second embodiment of the manual / automatic switching structure.

[0028] Figure 5 This is a cross-sectional structural diagram of the manual / automatic switching mechanism in Embodiment 1 during manual control.

[0029] Figure 6 This is a cross-sectional structural diagram of the electric control in Embodiment 1 of the manual / automatic switching mechanism.

[0030] In the diagram, 1. Housing; 2. Drive gear; 2a. Limiting surface; 2b. Mounting hole; 3. Transmission component; 3a. Limiting port; 3b. Retaining ring; 3c. Rotating shaft; 3d. Driven gear; 4. Magnet one; 5. Magnet two; 6. Cage; 6a. Bottom; 6b. Pushing part; 6c. Notch; 7. Moving part; 8. Gasket; 9. Valve stem; 10. Operating handle. Detailed Implementation

[0031] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0032] Example 1

[0033] like Figure 1 As shown, the manual / automatic switching mechanism is mounted on the housing 1, including a coaxially arranged annular drive gear 2 with teeth on its outer circumference and a transmission component 3 partially passing through the drive gear 2. In this embodiment, the transmission component 3 is cylindrical.

[0034] like Figure 5 As shown, the inner cross-section of the drive gear 2 is a regular polygon, and each side of the inner hole of the drive gear 2 is a planar limiting surface 2a. Any two adjacent limiting surfaces 2a form an included angle. On the outer wall of the drive gear 2, opposite to the included angle, there are recessed mounting holes 2b that are circular holes. A cylindrical magnet 4 is inserted and fixed in each mounting hole 2b.

[0035] An annular mounting gap is formed between the inner wall of the drive gear 2 and the outer surface of the transmission component 3. Several movable components 7 are disposed within this mounting gap. The number of movable components 7 is the same as the number of limiting surfaces 2a and the number of magnets 4, and the movable components 7 are evenly distributed within the mounting gap around the axis of the drive gear 2. In this embodiment, the inner hole of the drive gear 2 is a regular hexagon. The number of limiting surfaces 2a, mounting holes 2b, magnets 4, and movable components 7 are all six. The movable components 7 can be made of magnetic materials such as iron or steel, and their main characteristic is that they can be attracted by magnets. Preferably, they are made of magnetically conductive materials. They are arranged one-to-one with magnets 4, and magnets 4 can apply magnetic attraction to the movable components 7 to draw each movable component 7 into several angles formed by two adjacent limiting surfaces 2a. The movable components 7 are cylindrical; if necessary, they can be replaced with spherical shapes. The minimum distance between the limiting surfaces 2a and the outer surface of the transmission component 3 is less than the diameter of the cross-section of the movable component 7.

[0036] like Figure 4As shown, the manual / automatic switching mechanism also includes a retainer 6, which is an integral structure and can be made of magnetic materials such as iron or steel. Its main characteristics are that it can be attracted by a magnet and has a certain magnetic field shielding capability. Preferably, it is made of a magnetically conductive material. The retainer 6 comprises a ring-shaped bottom 6a and a cylindrical pushing part 6b integrally formed with the bottom 6a. One end of the pushing part 6b has several axially recessed notches 6c, which are evenly spaced around the axis of the bottom 6a, and each notch 6c penetrates the pushing part 6b radially. Here, the number of pushing parts 6b is the same as the number of movable parts 7, and each pushing part 6b is inserted between two adjacent movable parts 7, achieving an alternating distribution of movable parts 7 and pushing parts 6b in the circumferential direction, that is, several movable parts 7 are correspondingly arranged within several notches 6c.

[0037] Several recessed limiting openings 3a are evenly distributed on the outer surface of the transmission component 3 around the axis of the driving gear 2, allowing one side of the movable component 7 to be engaged. The bottom surface of the limiting opening 3a is an arc surface.

[0038] like Figure 3 As shown, the bottom 6a of the retainer 6 is located between the end of the drive gear 2 and the housing 1. Circular gaskets 8 are provided between the bottom 6a and the drive gear 2, and between the bottom 6a and the housing 1. Here, the gasket 8 can be installed at one of the two locations as needed. The side of the transmission member 3 has a protruding circular retaining ring 3b. The retaining ring 3b and the bottom 6a are located at the two ends of the drive gear 2, respectively, and the retaining ring 3b and the bottom 6a can respectively block the ports at both ends of the drive gear 2, thereby axially limiting the movable member 7 within the drive gear 2.

[0039] This manual / automatic switching mechanism also includes several block-shaped magnets 5, all of which are fixed to the housing 1. The magnets 5 and the movable component 7 are positioned on opposite sides of the bottom 6a of the retainer 6, and are arranged in a ring shape. These magnets 5 apply a magnetic attraction force to the bottom 6a of the retainer 6, thus keeping the retainer 6 relatively fixed to the housing 1 by the magnetic attraction force of the magnets 5. In this embodiment, the magnetic attraction force of the magnets 5 on the retainer 6 is greater than the magnetic attraction force of the magnet 4 on the movable component 7.

[0040] This manual / automatic switching mechanism can be applied to electrically controlled valves to switch between manual and electric control modes. During actual installation, the housing 1 is fixed to the valve body using screws or other fasteners. The drive gear 2 is connected to the output end of the drive motor, allowing the drive motor to drive the drive gear 2 to rotate circumferentially. One end of the transmission component 3 is fitted onto the outer side of the valve stem 9 and fixed circumferentially to the valve stem 9. The other end of the transmission component 3 is fixedly connected to an operating handle 10. In this embodiment, the inner hole of the transmission component 3 has a flat structure, i.e., it is not circular.

[0041] like Figure 5As shown, in the default state, several magnets 4 generate magnetic attraction to several moving parts 7, causing the moving parts 7 to roll along the limiting surface 2a and be inserted between two adjacent limiting surfaces 2a, that is, into the corners of the regular polygon of the inner hole of the drive gear 2. Since the position of each corner is farther from the transmission component 3 than the limiting surface 2a, the moving parts 7 inserted into the corners can always be separated from the transmission component 3. There is no other structure connecting the drive gear 2 and the transmission component 3, and the two are independent of each other. After the user manually turns the operating handle 10, the transmission component 3 and the valve stem 9 are driven to rotate circumferentially in sequence, while the drive gear 2, moving parts 7, retainer 6 and other components remain stationary.

[0042] like Figure 6 As shown, when electric drive is required, the drive motor drives the drive gear 2 to rotate circumferentially, causing the magnet 4 fixed on the drive gear 2 and the movable part 7 attracted by the magnet 4 to rotate synchronously. Meanwhile, the retainer 6 and the pushing part 6b on the retainer 6 are attracted by the magnet 5 fixed on the housing 1 and remain stationary. The sidewall of the notch 6c of the pushing part 6b, which extends between two adjacent movable parts 7, will approach the corresponding movable parts 7 until they come into contact. Then, the retainer 6 blocks several movable parts 7 and forces them to overcome the magnetic attraction of the magnet 4, moving them away from the angle position where the magnet 4 is located, and moving them along one of the limiting surfaces 2a. In actual production, the width of the notch 6c can be slightly larger than the diameter of the movable part 7, which makes the structure more compact and reduces the transmission response time.

[0043] After being moved, the movable part 7 is stuck between the upper limit surface 2a of the drive gear 2 and the limiting port 3a of the transmission part 3. The drive gear 2 and the transmission part 3 are fixed in one direction in the circumferential direction by the stuck movable part 7. The drive gear 2 can drive the transmission part 3 to rotate synchronously in the circumferential direction, thereby driving the valve stem 9 connected to the transmission part 3 to rotate, so as to realize the electric control of the valve opening.

[0044] After the electric drive ends, if manual control is required again, the operating handle 10 can be rotated slightly in the opposite direction. This will cause the transmission component 3 and the movable component 7, which is locked in the limiting port 3a, to rotate slightly in the opposite direction. After the movable component 7 pushes open the pushing part 6b, it can roll back into the angle formed between the two adjacent limiting surfaces 2a under the magnetic attraction of the magnet 4. Returning to the initial state, the user can freely control the operating handle 10 for manual control.

[0045] Example 2

[0046] like Figure 4As shown, the technical solution of this embodiment is largely the same as that of Embodiment 1, except that: the transmission component 3 may include a cylindrical rotating shaft 3c and a cylindrical driven gear 3d. The driven gear 3d is sleeved on the outside of the rotating shaft 3c. One end of the driven gear 3d passes into the driving gear 2 and cooperates with the driving gear 2 through the movable component 7, the retainer 6 and other structures in Embodiment 1. The other end of the driven gear 3d passes out of the driving gear 2, and the outer side of this end has teeth for meshing with other gears.

[0047] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A manual / automatic switching mechanism, mounted on a housing (1), comprising a coaxially arranged annular drive gear (2) and a transmission component (3) passing through the drive gear (2), wherein the transmission component (3) is used for transmission connection with the valve stem (9) and the operating handle (10) of the valve, characterized in that, The manual / automatic switching mechanism also includes a retainer (6) made of magnetic material. A magnet (5) is fixed on the housing (1) opposite to the retainer (6). The retainer (6) consists of a bottom (6a) in the shape of a circular plate and a cylindrical pusher (6b) integrally formed with the bottom (6a). The pusher (6b) is located between the drive gear (2) and the transmission member (3), and the pusher (6b) has several notches (6c). Each notch (6c) is provided with a movable member (7) made of magnetic material. The inner hole of the drive gear (2) has a regular polygonal cross section, and each side of the inner hole of the drive gear (2) is a limiting surface (2a). The minimum distance between the limiting surface (2a) and the outer side of the transmission member (3) is less than the maximum width of the movable member (7). When the driving gear (2) rotates circumferentially, the retainer (6) can block each of the movable members (7) under the magnetic attraction of the magnet (5) and make the movable member (7) move relative to the driving gear (2) around the axis of the driving gear (2) until it is stuck between the driving gear (2) and the transmission member (3). Several magnets (4) corresponding to the notches (6c) are fixed on the driving gear (2). Each of the movable members (7) can be stuck between two adjacent limiting surfaces (2a) and separated from the transmission member (3) under the magnetic attraction of the magnet (4).

2. The manual / automatic switching mechanism according to claim 1, characterized in that, Several recessed limiting ports (3a) are evenly distributed on the outer surface of the transmission component (3) around the axis of the drive gear (2). After the movable component (7) moves around the axis of the drive gear (2), one side of the movable component (7) can be inserted into the limiting port (3a).

3. The manual / automatic switching mechanism according to claim 2, characterized in that, The cross-sectional shape of the movable part (7) is circular, and the bottom surface of the limiting port (3a) is an arc surface.

4. The manual / automatic switching mechanism according to claim 1, 2, or 3, characterized in that, The second magnet (5) and the movable part (7) are disposed on opposite sides of the bottom (6a) of the holder (6).

5. The manual / automatic switching mechanism according to claim 1, 2, or 3, characterized in that, The outer wall of the drive gear (2) is provided with recessed mounting holes (2b) at each corner of the regular polygonal shape of the inner hole of the drive gear (2). The number of magnets (4) is the same as the number of mounting holes (2b) and they are fixed in each mounting hole (2b) in a one-to-one correspondence.

6. The manual / automatic switching mechanism according to claim 1, 2, or 3, characterized in that, The bottom (6a) of the retainer (6) is located between the end of the drive gear (2) and the housing (1), and an annular gasket (8) is provided between the bottom (6a) and the drive gear (2) and / or between the bottom (6a) and the housing (1).

7. The manual / automatic switching mechanism according to claim 6, characterized in that, The side of the transmission member (3) has a protruding ring-shaped retaining ring (3b). The retaining ring (3b) and the bottom (6a) are located at the two ends of the drive gear (2), and the retaining ring (3b) and the bottom (6a) can respectively block the ports at both ends of the drive gear (2).

8. The manual / automatic switching mechanism according to claim 1, 2, or 3, characterized in that, The movable part (7) is cylindrical or spherical.

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