New magnetic active sealing butterfly valve

Abstract

The present invention discloses a novel magnetic active sealing butterfly valve. The left and right valve bodies constitute the valve body, the lower part has a valve cavity, and the upper part has a structural installation cavity; a valve plate is installed in the valve cavity, an annular inner boss is provided in the middle of the valve cavity, an annular movable groove is provided inside the annular inner boss on the side close to the valve plate, a driven magnet and a valve seat are installed in the annular movable groove, an active magnet is installed in the annular inner boss, a driving gear is installed in the structural installation cavity, a driven gear is installed in the structural installation cavity, and the driving gear and the driving magnet are connected at both ends of the active valve stem. Both the driving gear and the driven gear are incomplete gears, and have matching circular gear parts and arc wheel parts to form an intermittent structure. The present invention improves the sealing effect of the valve, prolongs the service life of the valve, and enhances the safety in an emergency state by designing a magnetic drive sealing device with an active sealing function.

Description

Technical Field

[0001] The invention relates to a valve structure, in particular to a novel magnetic active sealing butterfly valve. Background Art

[0002] The butterfly valve, also known as the flap valve, is an important regulating valve in the fluid transmission system and is widely used in aerospace, petrochemical, water conservancy and hydropower and other fields. Its opening and closing parts are disc-shaped butterfly plates, which rotate around their axis to achieve the functions of opening, closing and regulating. It can be used to control the flow of various fluids such as water, air, high-pressure steam, mud, corrosive and radioactive media, and plays a vital role in the safety, rapidity and accuracy of the pipeline system. Since the butterfly valve itself is thin, the sealing performance in the closed state is an important indicator of its reliability. At present, the sealing method of the butterfly valve mainly uses the inclined valve seat surface to cooperate with the outer peripheral surface of the butterfly plate, and the friction between them is used to achieve sealing. This sealing method causes great wear on the valve seat and the sealing ring, and has a short service life. In addition, long-term use will cause the sealing ring to deform, which will lead to poor sealing performance. Therefore, it is necessary to further develop the sealing technology of the butterfly valve. Summary of the invention

[0003] The present invention provides a new type of magnetic active sealing butterfly valve. After the valve is closed, the sealing device can be opened, and the magnetic force of the permanent magnet is used to actively compress the sealing surfaces, thereby improving the sealing effect of the valve. Before opening the valve, the sealing device can be removed to achieve free rotation of the valve.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] The present invention comprises a right valve body, a valve plate, a lower driven valve stem, a valve seat, a driven magnet, a left valve body, an active magnet, an active gear, an active valve stem, a driven gear and an upper driven valve stem; the left valve body and the right valve body are connected and combined along the flow direction to form the valve body of the valve, the lower parts of the left valve body and the right valve body are provided with a flow channel cavity to form the valve cavity of the valve, and the left valve body and the right valve body above the valve cavity are provided with a hole cavity to form the structural installation cavity of the valve; a valve plate is installed in the valve cavity close to the right valve body, the upper and lower parts of the valve plate are respectively fixedly connected to the lower end of the upper driven valve stem and the upper end of the lower driven valve stem, and the lower end of the lower driven valve stem is movably hinged and sleeved on the bottom of the right valve body; An annular inner boss is provided in the middle of the valve cavity, and an annular movable groove is provided inside the annular inner boss on the side close to the valve plate, and a notch is provided in the annular movable groove on the side close to the valve plate. A driven magnet and a valve seat are installed in the annular movable groove in sequence from the left valve body to the right valve body. The driven magnet and the valve seat are fixedly connected to form a whole and move along the flow direction in the annular movable groove. A circular movable cavity is provided on the upper part of the valve cavity on the annular inner boss, and an active magnet is installed in the circular movable cavity. The active magnet is used to cooperate with the driven magnet for magnetic adsorption connection, and the lower end of the active valve stem is coaxially connected with the active magnet; a driving gear is installed in the structural installation cavity on the side close to the left valve body, and a driven gear is installed in the structural installation cavity on the side close to the right valve body. After the upper end is extended into the structural installation cavity, it is coaxially sleeved with the driving gear, and the upper end of the active valve stem is connected to the external rotation power source after passing through the left valve body, and the upper end of the upper driven valve stem is extended into the structural installation cavity and coaxially sleeved with the driven gear; the driving gear and the driven gear are both incomplete gears, a part of the circular gear part is provided on the circumference of the driving gear, and the rest of the circumference is the circular arc wheel part with a smooth surface, a part of the circular gear part is provided on the circumference of the driven gear, and the rest of the circumference is the circular arc wheel part with a smooth surface, the gear part of the driving gear and the gear part of the driven gear can be meshed and connected when driven by the active valve stem, and the circular arc wheel part of the driving gear and the circular arc wheel part of the driven gear are also sleeved in a fitting manner when the active valve stem rotates.

[0006] The driving gear has a driving gear threaded hole on the edge of the intersection of the circular gear part and the arc wheel part, and a driving gear screw is fixedly installed on the driving gear threaded hole through a thread;

[0007] A driven push rod is fixedly mounted on the driven gear via a driven gear screw. The driven push rod extends in a radial direction to the middle of the arc wheel portion of the driven gear and cooperates with the driving gear screw to switch the connection relationship between the driving gear and the driven gear under the rotation of the active valve stem.

[0008] The driven gear is provided with a driven gear screw groove, in which three driven gear threaded holes are provided. The driven push rod is in a cross structure, and the three ends of the driven push rod cross structure are respectively fixed to the three driven gear threaded holes through their own driven gear screw threads. The remaining end of the driven push rod cross structure extends outward in a radial direction from the rotation center of the driven gear.

[0009] The edge of the valve plate near one end of the annular movable groove is set as the outer rounded corner surface of the valve plate, and the edge of the valve seat near one end of the valve plate is set as the inner rounded corner surface of the valve seat. After the valve seat moves out of the notch of the annular movable groove, the inner rounded corner surface of the valve seat and the outer rounded corner surface of the valve plate are pressed and contacted and connected.

[0010] The outer peripheral surface of the valve plate is provided with a valve plate sealing ring installation groove, a sealing ring is installed in the valve plate sealing ring installation groove, and the sealing ring is installed in a sealing cooperation with the inner wall of the valve cavity.

[0011] A valve stem hole is provided at the center of the driving gear, and the driving valve stem is installed and matched with the valve stem hole through a keyway to form a coaxial connection.

[0012] A valve stem hole is provided at the center of the driven gear, and the upper driven valve stem is installed and matched with the valve stem hole through a keyway to form a coaxial connection.

[0013] The radial dimension of the circular gear part of the driving gear is smaller than the radial dimension of the arc wheel part.

[0014] The active magnet is a circular magnet formed by fixedly splicing two semicircles, and the two semicircles are two different magnetic poles of the active magnet.

[0015] The driven magnet is installed with the valve seat through screws, and the driven magnet is divided into two different magnetic poles along the axial direction of the annular movable groove, and the two magnetic poles are distributed axially.

[0016] The present invention has the following beneficial effects:

[0017] (1) The active magnet is used to push the repulsive force of the driven magnet, thereby pushing the valve seat toward the valve plate, so that the butterfly valve can be effectively actively sealed when closed, thereby improving the sealing effect of the valve.

[0018] (2) The active magnet is used to pull the attraction of the driven magnet, thereby pulling the valve seat away from the valve plate. After removing the seal, the butterfly valve is opened, which reduces the wear on the sealing ring and can further ensure the sealing effect of the valve, thereby extending the service life of the valve.

[0019] (3) The intermittent structure adopted enables the actuator to perform synchronous and asynchronous control of the valve and the sealing device. After closing the valve, the sealing device can be opened by continuing to rotate in the same direction; after closing the sealing device, the valve can be opened by continuing to rotate in the same direction, thereby improving the use of the valve.

[0020] (4) When the valve is opened, the active magnet and the driven magnet of the sealing structure will generate a torque that causes the valve to close, so that when the fluid passage needs to be cut off urgently, the valve can be closed more quickly. If necessary, the actuator can be directly removed and the valve can be automatically closed.

[0021] In summary, the present invention can improve the sealing effect of the valve, extend the service life of the valve, and enhance safety in emergency situations by designing a magnetically driven sealing device with an active sealing function through intermittently matched gears and circular arc connection structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional schematic diagram of the butterfly valve of the present invention when it is just closed and the sealing device is closed;

[0023] Figure 2 yes Figure 1 A top view of

[0024] Figure 3 is a cross-sectional schematic diagram of a state in which the butterfly valve of the present invention is fully opened and the sealing device is closed;

[0025] Figure 4 yes Figure 3 A top view of

[0026] Figure 5 is a top view of the driving gear 9 of the present invention;

[0027] Figure 6 is a top view of the driven gear 13 of the present invention;

[0028] Figure 7 It is a schematic structural diagram of the valve plate 2 of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the combination of the valve seat 4 and the driven magnet 5 of the present invention;

[0030] Fig. 9 It is a structural schematic diagram of the active magnet of the present invention;

[0031] Fig.10 It is a cross-sectional schematic diagram of the butterfly valve of the present invention when it is about to be closed and the sealing device is closed;

[0032] Fig.11 yes Fig.10 A top view of

[0033] Fig.12 is a cross-sectional schematic diagram of the butterfly valve of the present invention being closed and the sealing device being in a fully open state;

[0034] Fig.13 yes Fig.12 Top view of the .

[0035] In the figure: 1, right valve body, 2, valve plate, 2A, valve plate outer fillet surface, 2B, valve plate sealing ring installation groove, 3, lower driven valve stem, 4, valve seat, 4A, valve seat inner fillet surface, 5, driven magnet, 5A, driven magnet N level, 5B, driven magnet S level, 6, left valve body, 7, active magnet, 7A, active magnet N level, 7B, active magnet S level, 8, active gear screw, 9, active gear, 9A, active gear meshing teeth, 9B, Driving gear valve stem hole, 9C, driving gear meshing circle, 9D, driving gear threaded hole, 10, driving valve stem, 11, driven push rod, 12, driven gear screw, 13, driven gear, 13A, driven gear threaded hole, 13B, driven gear valve stem hole, 13C, driven gear meshing circle, 13D, driven gear screw groove, 13E, driven gear meshing teeth, 14, upper driven valve stem. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention is described below in conjunction with the accompanying drawings and examples.

[0037] like Figure 1 and Figure 2As shown, it includes a right valve body 1, a valve plate 2, a lower driven valve stem 3, a valve seat 4, a driven magnet 5, a left valve body 6, an active magnet 7, an active gear 9, an active valve stem 10, a driven gear 13 and an upper driven valve stem 14; the fluid flows and circulates in the direction from the left valve body 6 to the right valve body 1; the left valve body 6 and the right valve body 1 are connected and combined along the flow direction to form the valve body of the valve, the lower parts of the left valve body 6 and the right valve body 1 are provided with a flow channel cavity for circulation to form the valve cavity of the valve, the left valve body 6 and the right valve body 1 are both provided with a flow cavity for fluid communication, and the flow cavities of the left valve body 6 and the right valve body 1 are just docked and matched; the left valve body 6 and the right valve body 1 above the valve cavity are provided with a hole cavity to form the structural installation cavity of the valve; the valve plate 2 is installed in the valve cavity close to the right valve body 1, the upper and lower parts of the valve plate 2 are respectively fixed to the lower end of the upper driven valve stem 14 and the upper end of the lower driven valve stem 3, and the lower end of the lower driven valve stem 3 is movable hinged It is sleeved on the bottom of the right valve body 1; an annular inner boss is provided in the middle of the valve cavity, and an annular movable groove is provided inside the annular inner boss on the side close to the valve plate 2, the axial direction of the annular movable groove is along the flow direction, and a notch is provided on the side close to the valve plate 2. A driven magnet 5 and a valve seat 4 are installed in the annular movable groove in sequence from the left valve body 6 to the right valve body 1. The driven magnet 5 and the valve seat 4 are fixedly connected to form a whole and move in the annular movable groove along the flow direction. The driven magnet 5 and the valve seat 4 are connected by screws, and the valve seat 4 moves in the same direction along the flow direction at the same time driven by the driven magnet 5;

[0038] A circular movable cavity is formed on the upper part of the valve cavity on the annular inner boss, and an active magnet 7 is installed in the circular movable cavity. The active magnet 7 is used to cooperate with the driven magnet 5 for magnetic adsorption connection, and the lower end of the active valve stem 10 is coaxially connected to the active magnet 7; a driving gear 9 is installed on the side close to the left valve body 6 in the structural installation cavity, and a driven gear 13 is installed on the side close to the right valve body 1 in the structural installation cavity. After the upper end of the active valve stem 10 is inserted into the structural installation cavity, it is coaxially sleeved with the driving gear 9, and after the upper end of the active valve stem 10 passes through the left valve body 6, it is connected to an external rotary power source, and the active valve stem 10 passes through the through hole at the top of the left valve body 6 to connect the actuator of the external rotary power source; after the upper end of the upper driven valve stem 14 is inserted into the structural installation cavity, it is coaxially sleeved with the driven gear 13 through a key and a groove.

[0039] like Figure 5 and Figure 6As shown, both the driving gear 9 and the driven gear 13 are incomplete gears, a circular gear portion 9A with a central angle of 90° is provided on the circumference of the driving gear 9, and the rest of the circumference is a circular arc wheel portion 9C with a smooth surface, a circular gear portion 13E with a central angle of 90° is provided on the circumference of the driven gear 13, and the rest of the circumference is a circular arc wheel portion 13C with a smooth surface, the gear portion 9A of the driving gear 9 and the gear portion 13E of the driven gear 13 are meshed and connected when driven by the active valve stem 10, and the gear meshing portion of the driving gear meshing teeth 9A and the driven gear meshing teeth 13E is exactly 90°; the circular arc wheel portion 9C of the driving gear 9 and the circular arc wheel portion 13C of the driven gear 13 are also fitly connected when driven by the active valve stem 10 to rotate, and the arcs of the circular arc wheel portion 9C of the driving gear 9 and the circular arc wheel portion 13C of the driven gear 13 are consistent.

[0040] The driving gear meshing circle 9C is a smooth circular structure, and the driven gear meshing circle 13C is an inner arc structure, and the two are exactly matched, so the driving gear 9 and the driven gear 13 form an intermittent matching structure.

[0041] like Figure 5 As shown, the driving gear 9 is provided with a driving gear threaded hole 9D on the edge where the circular gear portion 9A and the circular arc wheel portion 9C thereof intersect, and a driving gear screw 8 is fixedly installed at the driving gear threaded hole 9D through threads.

[0042] like Figure 6 As shown, a driven push rod 11 is fixedly mounted on the driven gear 13 through a driven gear screw 12. The driven push rod 11 extends in the radial direction of the middle of the arc wheel portion 13C of the driven gear 13, and cooperates with the driving gear screw 8. Under the rotation of the active valve stem 10, the connection relationship between the driving gear 9 and the driven gear 13 is switched, specifically, between gear meshing and arc sleeve engagement. The driving gear screw 8 and the driven push rod 11 are on the same plane, and the intermittent movement between the master and driven gears is triggered by the cooperation and switching of the two.

[0043] The driven gear 13 is provided with a driven gear screw groove 13D, in which three driven gear threaded holes 13A are provided. The driven push rod 11 is in a cross structure, and the three ends of the cross structure of the driven push rod 11 are respectively fixed to the three driven gear threaded holes 13A through their own driven gear screws 12 threads, and the remaining end of the cross structure of the driven push rod 11 extends outwardly from the rotation center of the driven gear 13 in a radial direction.

[0044] like Figure 7 and Figure 8As shown, the edge of the valve plate 2 near one end of the annular movable groove is set as a valve plate outer rounded corner surface 2A, and the edge of the valve seat 4 near one end of the valve plate 2 is set as a valve seat inner rounded corner surface 4A. After the valve seat 4 near one end of the valve plate 2 moves out of the annular movable groove from the gap of the annular movable groove, the valve seat inner rounded corner surface 4A and the valve plate outer rounded corner surface 2A are pressed and connected. The valve seat inner rounded corner surface 4A of the valve seat 4 is exactly matched with the valve plate outer rounded corner surface 2A on the valve plate 2.

[0045] A valve plate sealing ring installation groove 2B is provided on the outer peripheral surface of the valve plate 2. A sealing ring is installed in the valve plate sealing ring installation groove 2B. The sealing ring and the inner wall of the valve cavity are installed in a sealing manner.

[0046] A valve stem hole 9B is provided at the center of the driving gear 9, and the driving valve stem 10 is installed and matched with the valve stem hole 9B through a keyway to form a coaxial connection. The same is true for the driving magnet 7, so that the driving magnet 7 and the driving gear 9 are coaxially connected together through the driving valve stem 10 with the keyway to achieve simultaneous synchronous rotation.

[0047] A valve stem hole 13B is formed at the center of the driven gear 13, and the upper driven valve stem 14 is installed and matched with the valve stem hole 13B through a keyway to form a coaxial connection.

[0048] like Fig. 9 As shown, the active magnet 7 is a circular magnet composed of two semicircles fixedly spliced ​​together, and the two semicircles are two different magnetic poles of the active magnet 7, specifically, the active magnet N pole 7A and the active magnet S pole 7B. In this way, the magnetic poles of the active magnet 7 are radially distributed, that is, the active magnet N pole 7A and the active magnet S pole 7B are symmetrically distributed.

[0049] The driven magnet 5 is installed with the valve seat 4 by screws, and the driven magnet 5 is divided into two different magnetic poles along the axial direction of the annular movable groove, and the two magnetic poles are axially distributed. In the specific implementation, the end of the driven magnet 5 close to the active magnet 7 can be the driven magnet N-stage 5A.

[0050] When the gear portion 9A of the driving gear 9 and the gear portion 13E of the driven gear 13 are meshed, the valve is in an open state, the driving magnet 7 rotates, and the whole formed by the driven magnet 5 and the valve seat 4 remains stationary.

[0051] When the arc wheel part 9C of the driving gear 9 and the arc wheel part 13C of the driven gear 13 are in the closed state, the driving magnet 7 keeps repelling the driven magnet 5 at one end close to the driven magnet 5, so that the integral structure formed by the driven magnet 5 and the valve seat 4 is close to and pressed against the valve seat 4.

[0052] Figure 1 to Figure 4 as well as Fig.10 , 11, 12, and 13 schematically illustrate the working principle of the present invention.

[0053] 1) The initial valve is in the extreme closed position, such as Fig.12 and Fig.13 As shown:

[0054] At this time, the valve plate 2 is in a closed state, and the driven magnet 5 and the valve seat 4 are in close contact with the valve plate 2 .

[0055] When the valve is in a completely sealed state, the valve plate 2 is in a tightly closed state, the active magnet 7 and the driven magnet 5 are facing each other with the same poles, and a repulsive force is generated therebetween, so that the driven magnet 5 drives the valve seat 4 to move toward the valve plate 2 until it is tightly attached to the valve plate 2, thereby achieving an active sealing effect.

[0056] 2) As shown in the figure, the active valve stem 10 drives the active gear 9 to continue to rotate clockwise until the valve is about to open. Figure 1 and Figure 2 As shown:

[0057] At this time, the valve plate 2 is still in a closed state, but the driven magnet 5 and the valve seat 4 are away from the valve plate 2 .

[0058] When the valve is in a critical open state, the valve plate 2 is in a just closed state, the active magnet 7 and the driven magnet 5 are oppositely polarized, and a gravitational force is generated therebetween so that the two attract each other.

[0059] 3) As shown in the figure, the active valve stem 10 drives the active gear 9 to continue to rotate clockwise until the valve is fully opened. Figure 3 and Figure 4 As shown:

[0060] At this time, the gear part 9A of the driving gear 9 meshes with the gear part 13E of the driven gear 13, and the valve plate 2 can drive the driven gear 13 along with the driving gear 9, thereby driving the upper driven valve stem 14 to rotate and adjust the opening freely within a certain range.

[0061] The active valve stem 10 drives the active magnet 7 to rotate, but the integral structure formed by the valve seat 4 and the driven magnet 5 is stationary and unaffected. When the valve is fully open, the polarities of the active magnet 7 and the driven magnet 5 are tangent at 90°.

[0062] 5) As shown in the figure, the active valve stem 10 drives the active gear 9 to continue to rotate counterclockwise until the valve is about to close. Fig.10 and Fig.11 As shown:

[0063] At this time, the gear portion 9A of the driving gear 9 and the gear portion 13E of the driven gear 13 are still meshed, and the valve plate 2 can continue to adjust the opening degree as the driving gear 9 drives the driven gear 13 to rotate.

[0064] This state continues to rotate counterclockwise with the driving gear 9 until the valve plate 2 is completely closed. Figure 1 and Figure 2 shown.

[0065] Finally, rotate counterclockwise until Fig.12 and Fig.13 Shown is the closed end position.

[0066] It can be seen from the above implementation process that the structural design of the present invention improves the sealing effect of the valve, prolongs the service life of the valve, and enhances the safety in emergency situations.

Claims

1. A magnetic active sealing butterfly valve, characterized in that: The valve comprises a right valve body (1), a valve plate (2), a lower driven valve stem (3), a valve seat (4), a driven magnet (5), a left valve body (6), an active magnet (7), an active gear (9), an active valve stem (10), a driven gear (13) and an upper driven valve stem (14); the left valve body (6) and the right valve body (1) are connected and assembled along the flow direction to form a valve body of the valve; a flow channel cavity for flow is provided at the lower part of the left valve body (6) and the right valve body (1) to form a valve cavity of the valve; a hole cavity is provided at the upper part of the left valve body (6) and the right valve body (1) to form a structural installation cavity of the valve; a valve plate (2) is installed in the valve cavity close to the right valve body (1); the upper and lower parts of the valve plate (2) are respectively connected to the upper driven valve stem (14); The lower end of the rod (14) is fixedly connected to the upper end of the lower driven valve stem (3), and the lower end of the lower driven valve stem (3) is movably hinged to the bottom of the right valve body (1); an annular inner boss is provided in the middle of the valve cavity, and an annular movable groove is provided inside the annular inner boss on a side close to the valve plate (2), and a notch is provided in the annular movable groove on a side close to the valve plate (2). A driven magnet (5) and a valve seat (4) are installed in the annular movable groove in sequence from the left valve body (6) to the right valve body (1), and the driven magnet (5) and the valve seat (4) are fixedly connected to form a whole and move in the annular movable groove along the flow direction. The annular inner boss is provided with a circular movable cavity at the upper part of the valve cavity, and an active magnet (7) is installed in the circular movable cavity. The active magnet (7) ) is used to cooperate with the driven magnet (5) for magnetic adsorption connection, and the lower end of the active valve stem (10) is coaxially connected to the active magnet (7); a driving gear (9) is installed on the side close to the left valve body (6) in the structural installation cavity, and a driven gear (13) is installed on the side close to the right valve body (1) in the structural installation cavity. After the upper end of the active valve stem (10) is inserted into the structural installation cavity, it is coaxially sleeved with the active gear (9), and after the upper end of the active valve stem (10) passes through the left valve body (6), it is connected to an external rotation power source, and after the upper end of the upper driven valve stem (14) is inserted into the structural installation cavity, it is coaxially sleeved with the driven gear (13); the driving gear (9) and the driven gear (13) are both incomplete gears, and the active gear (9) and the driven gear (13) are coaxially sleeved with the driven gear (13). A first circular gear portion (9A) is provided on a portion of the circumference of the active gear (9), and a first circular arc wheel portion (9C) with a smooth surface is provided on the rest of the circumference; a second circular gear portion (13E) is provided on a portion of the circumference of the driven gear (13), and a second circular arc wheel portion (13C) with a smooth surface is provided on the rest of the circumference; the first circular gear portion (9A) of the active gear (9) and the second circular gear portion (13E) of the driven gear (13) are meshingly connected when driven by the active valve stem (10); and the first circular arc wheel portion (9C) of the active gear (9) and the second circular arc wheel portion (13C) of the driven gear (13) are also fitably sleeved when driven by the active valve stem (10) to rotate.

2. A magnetic active sealing butterfly valve according to claim 1, characterized in that: The driving gear (9) is provided with a driving gear threaded hole (9D) on the edge of the intersection of the first circular gear portion (9A) and the first circular arc wheel portion (9C), and a driving gear screw (8) is fixedly installed at the driving gear threaded hole (9D) by means of a thread; A driven push rod (11) is fixedly mounted on the driven gear (13) via a driven gear screw (12); the driven push rod (11) extends in a radial direction to the middle of the second arc wheel portion (13C) of the driven gear (13) and cooperates with the driving gear screw (8) to switch the connection relationship between the driving gear (9) and the driven gear (13) under the rotation of the active valve stem (10).

3. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The driven gear (13) is provided with a driven gear screw groove (13D), and three driven gear threaded holes (13A) are provided in the driven gear screw groove (13D). The driven push rod (11) is in a cross structure, and three ends of the cross structure of the driven push rod (11) are respectively fixed to the three driven gear threaded holes (13A) through threads of their respective driven gear screws (12), and the remaining end of the cross structure of the driven push rod (11) is arranged to extend outwardly from the rotation center of the driven gear (13) in a radial direction.

4. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The edge of the valve plate (2) close to one end of the annular movable groove is configured as a valve plate outer rounded corner surface (2A), and the edge of the valve seat (4) close to one end of the valve plate (2) is configured as a valve seat inner rounded corner surface (4A), and after the valve seat (4) is moved out of the notch of the annular movable groove, the valve seat inner rounded corner surface (4A) and the valve plate outer rounded corner surface (2A) are pressed and contacted with each other.

5. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The outer peripheral surface of the valve plate (2) is provided with a valve plate sealing ring installation groove (2B), a sealing ring is installed in the valve plate sealing ring installation groove (2B), and the sealing ring and the inner wall of the valve cavity are installed in a sealing manner.

6. The magnetic active sealing butterfly valve according to claim 1, characterized in that: A first valve stem hole (9B) is provided at the center of the driving gear (9), and the driving valve stem (10) is installed and matched with the first valve stem hole (9B) through a keyway to form a coaxial connection.

7. The magnetic active sealing butterfly valve according to claim 1, characterized in that: A second valve stem hole (13B) is provided at the center of the driven gear (13), and the upper driven valve stem (14) is installed and matched with the second valve stem hole (13B) through a keyway to form a coaxial connection.

8. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The radial dimension of the first circular gear portion (9A) of the driving gear (9) is smaller than the radial dimension of the first circular arc wheel portion (9C).

9. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The active magnet (7) is a circular magnet formed by fixedly splicing two semicircles, and the two semicircles are respectively two different magnetic poles of the active magnet (7).

10. The magnetic active sealing butterfly valve according to claim 1, characterized in that: The driven magnet (5) is mounted on the valve seat (4) via screws, and the driven magnet (5) is divided into two different magnetic poles along the axial direction of the annular movable groove, and the two magnetic poles are axially distributed.

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