Linkage valve element and selector valve

Abstract

The utility model provides a linkage valve element which comprises a main valve plate and an auxiliary valve plate, the auxiliary valve plate is fixedly arranged on the main valve plate, the auxiliary valve plate is arranged on one side of the main valve plate, the face, away from the main valve plate, of the auxiliary valve plate is a sealing face, a driving groove used for driving the main valve plate to rotate is formed in the main valve plate, and the driving groove is arranged in the radial direction of the main valve plate. In the actual application scene, the linkage valve element is installed in the pipe shaped like the Chinese character'bu 'of the selector valve, the main valve plate is rotationally connected into the main flow channel of the pipe shaped like the Chinese character'bu', and when the driving part drives the main valve plate to rotate, the auxiliary valve plate moves along with the main valve plate; therefore, the circulation sectional area of the auxiliary flow channel is controlled while the circulation sectional area of the main flow channel is controlled. The linkage valve element does not need matched movement of multiple parts, faults caused by matching of the parts in the operation process are not likely to happen, the structural complexity is low, and the production cost and the maintenance cost are reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile exhaust selection valves, in particular to a linkage valve core and a selection valve. Background Art

[0002] Selector valves are required in existing cars. Selector valves usually control the exhaust of cars through the linkage valve core inside the selector valve, so that part or all of the exhaust gas discharged by the car changes direction through the selector valve, and part or all of the exhaust gas discharged by the car is connected to other positions of the car through the car selector valve for utilization. On the one hand, the residual energy in the exhaust gas of the car is fully utilized, and on the other hand, it can also reduce air pollution. Exhaust gas recycling generally utilizes the heat in the exhaust gas, such as using the heat in the exhaust gas to preheat the battery pack of a hybrid car in winter to make the battery work at a suitable temperature.

[0003] The existing selector valve generally includes a jack-type pipeline and a linkage valve core, and the linkage valve core includes a main valve plate, a sub-valve plate, a first assembly shaft, a second assembly shaft and a connecting rod mechanism. The main flow channel and the auxiliary flow channel are arranged on the jack-type pipeline. The main valve plate is connected to the main flow channel by rotating through the first assembly shaft, and the sub-valve plate is connected to the auxiliary flow channel by rotating through the second assembly shaft. The first assembly shaft and the second assembly shaft are connected by a connecting rod mechanism. When the main valve plate rotates, the auxiliary valve plate is driven to rotate through the connecting rod mechanism, thereby realizing linkage control. The existing equipment is prone to failure during operation due to its complex structure and many parts. It is easy to cause unstable operation. In addition, the structure is complex and the production and processing cost is high, which reduces the economic benefits.

[0004] In summary, there is an urgent need for a linkage valve core to solve or at least partially solve the problems existing in the prior art. Utility Model Content

[0005] The utility model aims to provide a linkage valve core, aiming to solve the problems of high cost and high failure rate of existing equipment. The specific technical solution is as follows:

[0006] A linkage valve core comprises a main valve plate and an auxiliary valve plate, wherein the auxiliary valve plate is fixedly arranged on the main valve plate and arranged on one side of the main valve plate, and the side of the auxiliary valve plate away from the main valve plate is a sealing surface, and the main valve plate is provided with a driving groove for driving the main valve plate to rotate, and the driving groove is arranged radially along the main valve plate.

[0007] Furthermore, the driving groove is used to install an external driving structure, and a limiting structure for circumferentially limiting the external driving structure is provided at the driving groove, and the limiting structure is extended along the length direction of the driving groove.

[0008] Furthermore, the driving groove is a square groove, a hexagonal groove or a kidney-shaped groove.

[0009] Furthermore, the limiting structure is a spline or a keyway.

[0010] Furthermore, a yielding sealing curved surface is provided on the main valve plate, and the yielding sealing curved surface is arranged along the circumference of the main valve plate.

[0011] Furthermore, the main valve plate is arranged in parallel with the auxiliary valve plate so that the main valve plate is fully opened when the auxiliary valve plate is fully closed.

[0012] Further, the auxiliary valve plate is eccentrically arranged on the main valve plate, and the auxiliary valve plate is entirely located on one side of a plane passing through the central axis of the driving groove and perpendicular to the main valve plate.

[0013] Furthermore, the sealing surface is an arc surface.

[0014] The utility model provides a selection valve, including a Bu-type pipeline and the above-mentioned linkage valve core, the Bu-type pipeline is provided with a main flow channel and an auxiliary flow channel, the auxiliary flow channel is arranged on the side of the main flow channel and is connected with the main flow channel, the linkage valve core is arranged on the Bu-type pipeline, the linkage valve core can be rotatably arranged in the main flow channel for adjusting the connecting cross-sectional area of ​​the main flow channel and the auxiliary flow channel, the linkage valve core includes a main valve plate and a sub-valve plate, the sub-valve plate is fixedly arranged on the main valve plate, the main valve plate can be rotatably arranged in the main flow channel for adjusting the opening range of the main flow channel, and the sub-valve plate is used to move synchronously with the main valve plate to synchronously adjust the opening range of the auxiliary flow channel when the main valve plate moves.

[0015] Furthermore, it also includes a driving structure, which includes an assembly shaft, a bearing and a crank. The main valve plate is rotatably connected to the Bu-type pipe through the assembly shaft. One end of the assembly shaft extends into the driving groove and is plugged into the driving groove. The end of the assembly shaft away from the main valve plate extends out of the Bu-type pipe, and the end extending out of the Bu-type pipe is rotatably connected to the Bu-type pipe through a bearing; the crank is arranged at the end of the assembly shaft away from the main valve plate, and the crank is clamped and connected to the assembly shaft.

[0016] The application of the technical solution of the utility model has the following beneficial effects:

[0017] In actual application scenarios, the linkage valve core is installed in the jack-shaped pipe of the selection valve, and the main valve disc is rotatably connected to the main flow channel of the jack-shaped pipe. The flow cross-sectional area of ​​the main flow channel is controlled by the rotation of the main valve disc, and the flow cross-sectional area of ​​the auxiliary flow channel is controlled by the movement of the auxiliary valve disc. When the main valve disc is driven to rotate by the driving groove, the auxiliary valve disc moves with the main valve disc, thereby controlling the flow cross-sectional area of ​​the auxiliary flow channel while controlling the flow cross-sectional area of ​​the main flow channel. The linkage valve core has few parts and strong integrity, and does not require the coordinated movement of multiple parts. Therefore, it is not easy to cause the operation of the selection valve to fail due to a failure in the coordination between the parts during operation. Secondly, the small number of parts and low structural complexity are conducive to reducing production costs, and its subsequent maintenance is also simpler and more convenient.

[0018] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. Figure 1-Figure 8 , the utility model is further described in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 This is one of the overall structural diagrams of a linkage valve core in Embodiment 1 of the utility model;

[0021] Figure 2 It is a schematic cross-sectional structure diagram of a linkage valve core in Embodiment 1 of the utility model;

[0022] Figure 3 This is the second schematic diagram of the overall structure of a linkage valve core in Embodiment 1 of the utility model;

[0023] Figure 4 It is a cross-sectional structural diagram of a linkage valve core with a limiting mechanism in Embodiment 1 of the utility model;

[0024] Figure 5 This is one of the internal structure diagrams of a selector valve in Embodiment 2 of the present utility model;

[0025] Figure 6 This is an exploded view of a selector valve in Embodiment 2 of the present utility model;

[0026] Figure 7 This is the second schematic diagram of the internal structure of a selector valve in Embodiment 2 of the present utility model;

[0027] Figure 8 This is a schematic diagram of the overall structure of a selector valve in Embodiment 2 of the present utility model;

[0028] Fig. 9 This is the third schematic diagram of the internal structure of a selector valve in Example 2 of the utility model.

[0029] Among them, 1. main valve plate; 11. driving groove; 12. limiting structure; 13. yielding sealing surface; 2. auxiliary valve plate; 3. sealing surface; 4. Bu-type pipeline; 41. main flow channel; 42. auxiliary flow channel; 43. installation part; 5. driving structure; 51. assembly shaft; 52. bearing; 53. crank; 6. linkage valve core. DETAILED DESCRIPTION

[0030] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are given. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0032] Embodiment 1:

[0033] See also Figure 1-Figure 4 The present embodiment provides a linkage valve core, including a main valve disc 1 and an auxiliary valve disc 2, wherein the auxiliary valve disc 2 is fixedly arranged on the main valve disc 1, and the auxiliary valve disc 2 is arranged on one side of the main valve disc 1, and the side of the auxiliary valve disc 2 away from the main valve disc 1 is a sealing surface 3, and the main valve disc 1 is provided with a driving groove 11 for driving the main valve disc 1 to rotate, and the driving groove 11 is arranged radially along the main valve disc 1.

[0034] Specifically, the auxiliary valve plate 2 is a circular valve plate, and the auxiliary valve plate 2 is fixedly connected to the main valve plate 1 through a connecting rod. The main valve plate 1 and the auxiliary valve plate 2 can be integrally cast or processed by welding later. In other embodiments, the auxiliary valve plate 2 can also be square or other shapes, as long as the sealing surface 3 on the auxiliary valve plate 2 can play a sealing role.

[0035] It can be understood that the linkage valve core 6 is installed in the jack-shaped pipe 4 of the selection valve, the main valve disc 1 is rotatably connected in the main flow channel 41 of the jack-shaped pipe, and rotates along the central axis of the driving groove 11. The flow cross-sectional area of ​​the main flow channel 41 is controlled by the rotation of the main valve disc 1, and the flow cross-sectional area of ​​the auxiliary flow channel 42 is controlled by the movement of the auxiliary valve disc 2. When the main valve disc 1 is driven to rotate by the driving groove 11, the auxiliary valve disc 2 moves with the main valve disc 1, so that the flow cross-sectional area of ​​the auxiliary flow channel 42 is controlled while the flow cross-sectional area of ​​the main flow channel 41 is controlled. The linkage valve core 6 has few parts and does not require the coordinated movement of multiple parts. Therefore, it is not easy to cause the operation of the selection valve to fail due to a failure in the coordination between the parts during operation. Secondly, the number of parts is small and the structural complexity is low, which is conducive to reducing production costs, and its subsequent maintenance is also simpler and more convenient.

[0036] Furthermore, the driving groove 11 is used to install the external driving structure 5, and a limiting structure 12 for circumferentially limiting the external driving structure 5 is provided at the driving groove 11, and the limiting structure 12 is arranged to extend along the length direction of the driving groove 11. By inserting the external driving structure 5 into the driving groove 11, cooperating with the driving groove 11, and rotating the external driving structure 5, the main valve plate 1 is driven to rotate. It can be understood that the limiting structure 12 can be a spline or an ordinary keyway, such as an ordinary flat key, a semicircular key, etc. The keyway is arranged to extend along the depth direction of the driving groove 11, and the keyway is prevented from relative rotation with the driving groove 11 by the keyway and the key, so that the external driving structure 5 drives the main valve plate 1 to rotate along the axial direction of the driving groove 11.

[0037] In some preferred embodiments, the limiting structure 12 may not be separately provided, and the driving groove 11 may be directly provided as a square groove. In other preferred embodiments, the driving groove 11 may also be provided as a hexagonal groove, a waist-shaped groove or other special-shaped grooves that can limit the external driving structure 5 from rotating relative to the main valve plate 1 along the circumferential direction of the driving groove 11. The main valve plate 1 is directly driven to rotate after the external component is inserted into the driving groove 11. The plug-in fit of the external component with the driving groove 11 may be an interference fit, a transition fit, or even a clearance fit. Of course, the premise is that when the external component rotates in the driving groove 11, it needs to abut against the inner side wall of the driving groove 11 to transmit the torque to the main valve plate 1, so that the main valve plate 1 rotates around the central axis of the driving groove 11.

[0038] Furthermore, a yielding sealing curved surface 13 is provided on the main valve disc 1, and the yielding sealing curved surface 13 is arranged along the circumference of the main valve disc 1. It can be understood that in the process of the main valve disc 1 rotating and sealing, the yielding sealing curved surface 13 is arranged to prevent the main valve disc 1 from interfering with the side wall of the main flow channel 41 during the rotation process. It should also be noted that the main flow channel 41 and the auxiliary flow channel 42 are both circular flow channels, that is, the cross section of the main valve disc 1 is circular, and the cross section of the auxiliary valve disc is also circular. In some preferred embodiments, the main valve disc 1 is an elliptical valve disc, the yielding sealing curved surface 13 is located near the major axis of the ellipse, and the driving groove 11 is coaxially arranged with the minor axis of the ellipse. The yielding sealing curved surface 13 is an arc surface, and when the main valve disc 1 seals the main flow channel 41, the yielding sealing curved surface 13 abuts and cooperates with the side wall of the main flow channel 41 to achieve the sealing of the main flow channel 41.

[0039] It can be understood that when the main valve disc 1 is a circular valve disc, the main valve disc 1 needs to rotate 90 degrees from fully opening the main flow channel 41 to fully closing the main flow channel 41, and when the main valve disc 1 is an elliptical valve disc, the angle of rotation from fully opening to fully closing is less than 90 degrees. Therefore, when the main valve disc 1 is an elliptical valve disc, the rotation sensitivity is greater, especially when the main valve disc 1 is just opened, a smaller rotation angle can obtain a larger valve opening, while a circular valve disc needs a larger rotation angle to achieve a large valve opening when it is just opened. Of course, the use of an elliptical valve disc is a preferred embodiment of the present application. In other embodiments, the main valve disc 1 can also be a circular valve disc, and when the cross-section of the main flow channel 41 is rectangular, the main valve disc 1 can also be a rectangular valve disc.

[0040] Furthermore, the main valve disc 1 is arranged in parallel with the auxiliary valve disc 2, and the sealing surface 3 of the auxiliary valve disc 2 abuts against the side wall of the main channel 41 to completely close the auxiliary channel 42, so that when the main valve disc 1 is fully opened, the main channel 41 has the maximum opening.

[0041] The auxiliary valve plate 2 is eccentrically arranged on the main valve plate 1, and the auxiliary valve plate 2 is entirely located on one side of a plane passing through the central axis of the driving groove 11 and perpendicular to the main valve plate 1. This prevents the auxiliary valve plate 2 from interfering with the inner wall of the main flow channel 41 during the rotation of the auxiliary valve plate 2, thereby preventing the auxiliary valve plate 2 from being unable to move. Figure 2 or Figure 4 , the auxiliary valve disc 2 is completely located on one side of the dotted line in the figure. It is found that if the auxiliary valve disc 2 crosses the dotted line, that is, the auxiliary valve disc 2 crosses the plane passing through the central axis of the driving groove 11 and perpendicular to the main valve disc 1, the auxiliary valve disc 2 will interfere with the inner wall of the main flow channel 41 during the process of rotating around the central axis of the driving groove 11. Therefore, in order to avoid interference, the auxiliary valve disc 2 needs to be set on one side of the plane passing through the central axis of the driving groove 11 and perpendicular to the main valve disc 1.

[0042] Furthermore, the sealing surface 3 is an arc surface, the cross section of the main channel 41 is circular, and the sealing surface 3 is an arc surface so that the sealing surface 3 can be completely fitted with the inner wall of the main channel 41, thereby improving the sealing performance of the auxiliary valve plate 2 to the auxiliary channel 42, and making the seal tighter when the auxiliary valve plate 2 closes the auxiliary channel 42. In other embodiments, the cross section of the main channel 41 is square, and the sealing surface 3 is a plane, and the sealing of the auxiliary channel 42 is achieved by abutting the plane with the square inner wall plane of the main channel 41.

[0043] The beneficial effects of the utility model are as follows: by setting the main valve plate 1 and the auxiliary valve plate as a whole, the main valve plate 1 is driven to rotate through the driving groove 11 to drive the auxiliary valve plate 2 to move simultaneously. Compared with the existing solution of using a connecting rod to connect the main valve plate 1 and the auxiliary valve plate 2, while achieving the same function, the structure is simplified, the working stability is improved, the number of parts is reduced, and the processing and production costs are reduced.

[0044] The elliptical design of the main valve plate 1 improves the sensitivity of operating the valve. When the main flow channel 41 is rotated at the same angle, the opening degree is larger.

[0045] By providing a yielding sealing curved surface 13 on the main valve plate 1, while preventing the main valve plate 1 from interfering with the inner wall of the main flow channel 41, the yielding sealing curved surface 13 abuts and seals against the inner wall of the main flow channel 41, thereby increasing the contact area between the main valve plate 1 and the inner wall of the main flow channel 41, thereby improving the sealing performance between the main valve plate 1 and the inner wall of the main flow channel 41.

[0046] Embodiment 2:

[0047] See also Figure 5-Figure 9 The utility model also provides a selection valve, including a Bu-type pipeline 4 and the above-mentioned linkage valve core 6, the Bu-type pipeline 4 is provided with a main flow channel 41 and an auxiliary flow channel 42, the auxiliary flow channel 42 is arranged on the side of the main flow channel 41 and is connected with the main flow channel 41, the linkage valve core 6 is arranged on the Bu-type pipeline 4, the linkage valve core 6 is rotatably arranged in the main flow channel 41 for adjusting the connecting cross-sectional area between the main flow channel 41 and the auxiliary flow channel 42, the linkage valve core 6 includes a main valve plate 1 and a sub-valve plate 2, the sub-valve plate 2 is fixedly arranged on the main valve plate 1, the main valve plate 1 is rotatably arranged in the main flow channel 41 for adjusting the opening range of the main flow channel 41, and the sub-valve plate 2 is used to move synchronously with the main valve plate 1 to synchronously adjust the opening range of the auxiliary flow channel 42 when the main valve plate 1 moves.

[0048] It can be understood that in this embodiment, the main flow channel 41 and the auxiliary flow channel 42 are both cylindrical channels. Of course, in other embodiments, the cross-sectional shapes of the main flow channel 41 and the auxiliary flow channel 42 can also be square or other special-shaped cross-sections. The main valve disc 1 and the auxiliary valve disc 2 are both located in the main flow channel 41. The main valve disc 1 is rotatably connected to the jack-shaped pipe 4 through the assembly shaft 51, and the assembly shaft 51 extends out of the jack-shaped pipe 4. The main valve disc 1 is driven to rotate and position through the rotation of the assembly shaft 51. When the main valve disc 1 rotates, the auxiliary valve disc 2 also moves with the main valve disc 1, thereby realizing linkage. When the main valve disc 1 opens the main flow channel 41, the auxiliary valve disc 2 closes the auxiliary flow channel. Secondly, by controlling the relative rotation angle of the main valve disc 1, the relative opening of the main flow channel 41 and the auxiliary flow channel 42 is controlled. The problem of simultaneously controlling the relative opening of the main flow channel 41 and the auxiliary flow channel is solved, and the problem of high failure rate and high production cost of the existing design using a connecting rod mechanism for control is also partially solved.

[0049] Furthermore, a driving structure 5 is also included, and the driving structure 5 includes an assembly shaft 51, a bearing 52 and a crank 53. The main valve disc 1 is rotatably connected to the jack-type pipe 4 through the assembly shaft 51. One end of the assembly shaft 51 extends into the driving groove 11 and is plugged and matched with the driving groove 11. The end of the assembly shaft 51 away from the main valve disc 1 extends out of the jack-type pipe 4, and the end extending out of the jack-type pipe 4 is rotatably connected to the jack-type pipe 4 through the bearing 52. Specifically, the plug-in groove is a square groove, and the assembly shaft 51 is a square shaft. The square assembly shaft 51 is plugged into the square plug-in groove, and the side wall of the square assembly shaft 51 abuts against the side wall of the plug-in groove, so as to realize the transmission of torque to the main valve disc 1 through the assembly shaft 51, thereby driving the main valve disc 1 to rotate and position. The bearing 52 is sleeved on the assembly shaft 51, and the outer periphery of the bearing 52 is matched with the jack-type pipe 4, so that the assembly shaft 51 is rotatably connected to the jack-type pipe 4. It should be noted that the bearing 52 can be a sliding bearing 52 or a rolling bearing 52.

[0050] Furthermore, the crank 53 is disposed at one end of the assembly shaft 51 away from the main valve plate 1, and the crank 53 is connected to the assembly shaft 51 by a clamping connection. It can be understood that by driving the crank 53 to rotate, the assembly shaft 51 and the main valve plate 1 connected to the assembly shaft 51 can be driven to rotate, so that the rotation and positioning of the main valve plate 1 can be controlled by controlling the rotation and positioning of the crank 53.

[0051] In addition, the outer pipe 4 also has a mounting portion 43, through which the selector valve can be conveniently mounted on an automobile engine or other equipment on which the selector valve needs to be mounted. It should be noted that in this embodiment, the mounting portion 43 is provided with two through holes, and when the selector valve is mounted on the engine, fasteners are inserted through the through holes for mounting.

[0052] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A linkage valve core, characterized in that: The invention comprises a main valve plate (1) and an auxiliary valve plate (2), wherein the auxiliary valve plate (2) is fixedly arranged on the main valve plate (1), and the auxiliary valve plate (2) is arranged on one side of the main valve plate (1), and the side of the auxiliary valve plate (2) away from the main valve plate (1) is a sealing surface (3), and the main valve plate (1) is provided with a driving groove (11) for driving the main valve plate (1) to rotate, and the driving groove (11) is arranged radially along the main valve plate (1).

2. A linkage valve core according to claim 1, characterized in that: The driving groove (11) is used for installing an external driving structure (5), and a limiting structure (12) for circumferentially limiting the external driving structure (5) is provided at the driving groove (11), and the limiting structure (12) is arranged to extend along the length direction of the driving groove (11).

3. The linkage valve core according to claim 1, characterized in that: The driving groove (11) is a square groove, a hexagonal groove, or a waist-shaped groove.

4. A linkage valve core according to claim 2, characterized in that: The limiting structure (12) is a spline or a keyway.

5. The linkage valve core according to claim 2, characterized in that: The main valve plate (1) is provided with a yielding sealing curved surface (13), and the yielding sealing curved surface (13) is arranged along the circumference of the main valve plate (1).

6. The linkage valve core according to claim 2, characterized in that: The main valve plate (1) and the auxiliary valve plate (2) are arranged in parallel so that the main valve plate (1) is fully opened when the auxiliary valve plate (2) is fully closed.

7. The linkage valve core according to claim 2, characterized in that: The auxiliary valve plate (2) is eccentrically arranged on the main valve plate (1), and the auxiliary valve plate (2) is entirely located on one side of a plane which is located on the central axis of the driving groove (11) and is perpendicular to the main valve plate (1).

8. The linkage valve core according to claim 2, characterized in that: The sealing surface (3) is an arc surface.

9. A selector valve, characterized in that: It comprises a Bu-type pipeline (4) and a linkage valve core (6) according to any one of claims 1 to 8, The φ-shaped pipe (4) is provided with a main flow channel (41) and an auxiliary flow channel (42), wherein the auxiliary flow channel (42) is arranged on the side of the main flow channel (41) and is in communication with the main flow channel (41). The linkage valve core (6) is arranged on the 1 / 4 type pipeline (4), and the linkage valve core (6) is rotatably arranged in the main flow channel (41) for adjusting the communicating cross-sectional area between the main flow channel (41) and the auxiliary flow channel (42). The linkage valve core (6) comprises a main valve plate (1) and an auxiliary valve plate (2); the auxiliary valve plate (2) is fixedly arranged on the main valve plate (1); the main valve plate (1) is rotatably arranged in the main flow channel (41) for adjusting the opening range of the main flow channel (41); the auxiliary valve plate (2) is used to move synchronously with the main valve plate (1) so as to synchronously adjust the opening range of the auxiliary flow channel (42) when the main valve plate (1) moves.

10. A selector valve according to claim 9, characterized in that: The invention also comprises a driving structure (5), wherein the driving structure (5) comprises an assembly shaft (51), a bearing (52) and a crank (53). The main valve plate (1) is rotatably connected to the BU-type pipe (4) via an assembly shaft (51); one end of the assembly shaft (51) extends into the driving groove (11) and is plugged into the driving groove (11); one end of the assembly shaft (51) away from the main valve plate (1) extends out of the BU-type pipe (4), and the end extending out of the BU-type pipe (4) is rotatably connected to the BU-type pipe (4) via the bearing (52); The crank (53) is arranged at one end of the assembly shaft (51) away from the main valve plate (1), and the crank (53) is connected to the assembly shaft (51) by snap-fitting.

Images