A compact side-mounted butterfly valve

Abstract

The application provides a compact side-mounted butterfly valve, which comprises a valve body, an actuating mechanism and a protection mechanism. The valve body is externally fixed with a box body, the actuating mechanism is integrated in the box body, the hand wheel is side-mounted, and the first rack is parallel to the sliding design of the axial line of the valve body, thereby optimizing the overall structural layout, making the butterfly valve have compact structural characteristics, and being especially suitable for installation scenes with limited hand wheel rotating space such as wall installation, providing sufficient operation space for the operator, making the hand wheel rotation and valve plate opening and closing operation more convenient and labor-saving, and effectively improving the adaptability and operation practicability of the butterfly valve in a narrow installation environment. When the valve plate is rotated to the open state, the two baffles of the protection mechanism are rotated to the side of the sealing ring facing the water inlet end of the valve cavity, so as to effectively shield the sealing ring facing the water inlet end when the valve cavity is opened, avoid the impurities in the fluid directly impacting and wearing the sealing ring, and realize the protection effect of the sealing ring.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of butterfly valves, in particular to a compact side-mounted butterfly valve. BACKGROUND

[0002] The butterfly valve is a commonly used device for controlling the opening and closing of a medium in an industrial fluid pipeline system, and is widely used in scenarios that require complete opening or complete closing of the pipeline, such as main pipe on-off control of a water supply and drainage system, medium conveying pipeline switching in chemical production, and loop opening and closing of a heating and ventilation system.

[0003] In practical applications, existing butterfly valves used in full opening and closing scenarios often have the problem of insufficient compactness of the structure layout. Due to the lack of optimization in the arrangement of the transmission components and the manual operation components of the actuator, when the butterfly valve is installed in a narrow space against a wall or against equipment, the space around the manual operation components for full opening or full closing is severely compressed, and the operator has difficulty in smoothly applying force when driving the valve core to complete the opening or closing action, which not only increases the operation difficulty, but also may cause the pipeline to not be fully opened or closed due to incomplete operation, affecting the normal operation of the system and reducing the adaptability of the butterfly valve in a narrow installation environment. SUMMARY

[0004] In view of the above background, the present application provides a compact side-mounted butterfly valve.

[0005] The present application adopts the following technical solutions:

[0006] A compact side-mounted butterfly valve, comprising:

[0007] A valve body, an outer fixed box body, two semicircular annular retaining rings arranged on both sides of the valve cavity in the valve body, and the two retaining rings being arranged staggered;

[0008] A valve plate, a transmission shaft fixed to the valve plate, two semicircular annular sealing rings arranged on both sides of the valve plate, the two sealing rings being respectively located on both sides of the transmission shaft, the valve plate being located in the valve body, and the transmission shaft passing through the valve body into the box body, so that the valve plate is limited to rotate relative to the valve cavity, and when the valve plate is rotated to seal the valve cavity, the two sealing rings are pressed towards the two retaining rings, respectively;

[0009] The actuating mechanism comprises a hand wheel, a first rack, a first gear, a first connecting rod and a second connecting rod. One end of the hand wheel is fixed with a first rotating shaft which penetrates into the box body from the side of the valve body. The first rack is arranged to slide in the box body, and the sliding direction of the first rack is parallel to the axial line of the valve body. The first gear is arranged to rotate in the box body, and the first gear and the first rack are engaged. The rotation of the first rotating shaft drives the rotation of the first gear. One end of the first connecting rod is fixed to the transmission shaft. The two ends of the second connecting rod are respectively pivotally connected to the first rack and the first connecting rod.

[0010] When the hand wheel is rotated, the first gear drives the first rack to move, the first rack pulls the second connecting rod, the second connecting rod drives the first connecting rod to rotate the transmission shaft, and the valve plate is rotated.

[0011] In a possible implementation, a sliding block is fixed in the box body. The sliding direction of the sliding block is parallel to the axial line of the valve body. The sliding block is adaptively connected to a sliding rail. The first rack is fixed to the sliding rail. One end of the sliding rail is further fixedly connected to an connecting arm. The second connecting rod and the connecting arm are pivotally connected.

[0012] In a possible implementation, the butterfly valve further comprises a protection mechanism. The protection mechanism comprises a first sliding block, a transmission shaft, an extension rod, a moving plate, a baffle and a swing rod.

[0013] The first sliding block is limited to slide on the diameter line in the middle of the valve plate.

[0014] The baffle is an arc-shaped strip body. The cross section of the baffle is L-shaped. The upper and lower ends of the valve plate are both provided with the baffle. The two baffles are limited to rotate coaxially relative to the valve plate. The baffle is located on the side of the sealing ring of the valve body which faces the water inlet end of the valve cavity after the valve body is opened. The baffle blocks the annular surface of the valve plate.

[0015] The swing rod connects the baffle and the first sliding block. The two ends of the swing rod are respectively pivotally connected to the baffle and the first sliding block.

[0016] The transmission shaft is penetrated along the axial line thereof. One end of the extension rod penetrates through the transmission shaft to the inside of the valve plate. The other end of the extension rod is located in the inside of the box body.

[0017] The moving plate is located in the box body. The moving plate is limited to move linearly relative to the valve body. The moving plate and one end of the extension rod located in the inside of the box body are axially fixedly connected. The other end of the moving plate is fixed with a second rack. The first rotating shaft is provided with a transmission gear. The second rack and the transmission gear are engaged.

[0018] When the hand wheel is rotated to drive the transmission gear to rotate, the second rack is moved and synchronously drives the telescopic rod to extend out of the valve body, the telescopic rod links the first slider to move, the first slider pushes the swing rod to drive the baffle to swing towards the sealing ring, and the two baffles are swung to block the sealing ring towards the water inlet end of the valve body.

[0019] In a possible implementation, the protection mechanism further includes a second guide post and a second slider, one end of the telescopic rod is fixed with the second guide post in the cavity of the valve plate, the second guide post is parallel to the axis of the valve body, the second slider is gap-fitted through the second guide post, the inner wall of the cavity of the valve plate is provided with an inclined guide groove, one side of the second slider is provided with a guide pin, and the guide pin is adapted to be embedded in the guide groove to slide; when the telescopic rod moves to drive the second guide post to move, the second guide post drives the second slider to move along the guide groove, so that the second slider pushes the first slider to move.

[0020] In a possible implementation, the first slider is fixed with a third guide post, the second slider is provided with a guide hole, and the third guide post is gap-fitted through the guide hole, so that the second slider moves to push the first slider to move.

[0021] In a possible implementation, the telescopic rod is fixed with a third rack in the cavity of the valve plate, a rotatable third gear is arranged in the cavity of the valve plate, the first slider is fixed with a fourth rack, and the third gear is engaged with the third rack and the fourth rack; when the telescopic rod moves to drive the third rack to move, the third gear is driven to rotate, and the third gear synchronously drives the fourth rack to move, so that the first slider moves to push the swing rod to drive the baffle to swing towards the sealing ring, and the two baffles are swung to block the sealing ring towards the water inlet end of the valve body.

[0022] In a possible implementation, the protection mechanism further includes a first guide post, two first guide posts are fixed in the cavity of the valve plate, and both of the first guide posts are parallel to the axis of the valve body, and the first slider is gap-fitted through the two first guide posts.

[0023] In a possible implementation, one side of the cavity of the valve plate forms an opening, the valve plate encapsulates a sealing plate at the opening, arc-shaped through grooves are arranged on both sides of the sealing plate, both of the through grooves are coaxial with the axis of the valve plate, one side of the baffle is fixed with two connecting rods, one end of each of the two connecting rods away from the baffle is simultaneously fixed with a connecting plate, both of the connecting rods are located on the radius line of the baffle, and the connecting rods are fixed with the connecting plate through a limiting pin at the position of the radius line of the valve plate, and the limiting pin is adapted to pass through the through grooves.

[0024] In a possible implementation, the box body is provided with a rotatable connecting shaft, one end of the connecting shaft is fixed with the first gear, the other end of the connecting shaft is fixed with a second gear, and the transmission gear is a sector gear. When the hand wheel is rotated to open the valve plate, the transmission gear is first engaged with the second gear for transmission, and then the transmission gear is engaged with the second rack for transmission.

[0025] In a possible implementation, the outer diameter of the valve plate is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate is greater than the inner diameter of the blocking ring. Both ends of the valve plate are provided with a clearance groove, the two blocking rings are integrally formed, and the same end of the two blocking rings is connected with a filling part. The clearance groove is sleeved outside the filling part and rotates.

[0026] From the above description of the structure of the present application, compared with the prior art, the present application has the following advantages: by integrating the actuator in the box body fixed outside the valve body, combining the hand wheel side installation and the sliding design of the first rack parallel to the axis of the valve body, the overall structure layout is optimized, the butterfly valve has compact structure characteristics, and is especially suitable for installation scenes with limited hand wheel rotation space such as wall installation, providing sufficient operation space for the operator, making the hand wheel rotation and valve plate opening and closing operation more convenient and labor-saving, and effectively improving the adaptability and operation practicability of the butterfly valve in narrow installation environment. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Fig. 6 is a perspective view of the present application after the valve plate is closed.

[0028] Figure 2 Fig. 7 is a cross-sectional view of the present application. Figure 1

[0029] Figure 3 Fig. 8 is a perspective view of the valve body.

[0030] Figure 4 Fig. 9 is an enlarged view of position A in Fig. 8. Figure 3

[0031] Fig. 10 is a perspective view of the actuator connecting the valve plate. Figure 5

[0032] Fig. 11 is a perspective view of the actuator. Figure 6

[0033] Fig. 12 is a perspective view of the present application after the valve plate is opened. Figure 7

[0034] Fig. 13 is an enlarged view of position B in Fig. 12. Figure 8 Figure 7 Fig. 14 is a perspective view of the present application.​​

[0035] Figure 9 Schematic view of the telescopic rod driving connection with the first slider through the third rack, the third gear and the fourth rack.

[0036] Figure 10 Schematic view of the fixing of the sealing plate on one side of the valve plate.

[0037] Figure 11 Schematic view of the Figure 10 Enlarged view of the middle C.

[0038] Figure 12 Schematic view of the connection of the baffle with the connecting plate through the connecting rod.

[0039] Figure 13 Schematic view of the Figure 10 Schematic view after the hiding of the sealing plate.

[0040] Figure 14 Schematic view of the Figure 13 Enlarged view of the middle D.

[0041] Figure 15 Schematic view after the guide pin of the second slider is embedded in the guide slot.

[0042] Figure 16 Schematic view of the second slider.

[0043] Figure 17 Schematic view of the first slider provided with the third guide column.

[0044] Figure 18 Schematic view of the cross section of the internal structure of the box body.

[0045] Figure 19 Schematic view of the Figure 18 Enlarged view of the middle E.

[0046] Figure 20 Schematic view of the limiting assembly.

[0047] Figure 21 Schematic view of the limiting assembly provided in the actuator.

[0048] Figure 22 Schematic view of the Figure 21 Enlarged view of the middle F. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical scheme and advantages of the application clearer, the application will be described in further detail below with reference to the drawings.

[0050] Hereinafter, the terms "first", "second", and the like are used only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present embodiment, the meaning of "a plurality of" is two or more, unless otherwise stated.

[0051] In addition, in the present embodiment, the orientation terms "upper", "lower", and the like are defined with respect to the orientation in which the components in the drawings are placed, and it should be understood that these directional terms are relative concepts, which are used for the description and clarification of relative positions, and can be changed accordingly according to the change of the orientation in which the components in the drawings are placed.

[0052] The present application provides a compact side-mounted butterfly valve, as shown in the accompanying drawings Figures 1 to 4 The butterfly valve includes a valve body 1, a valve plate 5, an actuator 2, and a protection mechanism 3. The actuator 2 is integrated inside the box body 4 to optimize the overall structural layout. The valve body 1 is externally fixed to the box body 4. The valve cavity inside the valve body 1 is configured with two semicircular annular retaining rings 11 on both sides. The two retaining rings 11 are arranged staggered to form a structure basis suitable for sealing. The valve plate 5 is fixed with a transmission shaft 51 at the center of both ends. The valve plate 5 is assembled with two semicircular annular sealing rings 52 on both sides. The two sealing rings 52 are symmetrically distributed around the transmission shaft 51 and are located on both sides of the transmission shaft 51. The valve plate 5 is entirely accommodated in the valve cavity. The two transmission shafts 51 penetrate through the side walls of the valve body 1 on both sides. One end of one of the transmission shafts 51 extends to the inside of the box body 4. The cooperation between the transmission shaft 51 and the valve body 1 limits the valve plate 5 to only rotate relative to the valve cavity.

[0053] As shown in the accompanying drawings Figure 1 and 2 When the actuator 2 drives the transmission shaft 51 to rotate the valve plate 5 to the sealing position of the valve cavity, that is, the position between the two retaining rings 11, the sealing rings 52 on both sides of the valve plate 5 are in close contact with the retaining rings 11 on the corresponding side of the valve cavity, and reliable sealing is achieved through the precise cooperation between the sealing rings 52 and the retaining rings 11. When the actuator 2 drives the transmission shaft 51 to rotate the valve plate 5 to the opening position of the valve cavity, as shown in the accompanying drawings Figure 7As shown, the valve plate 5 rotates to a state substantially parallel to the valve cavity axis, forming a smooth fluid passage, at which time the sealing ring 52 on both sides of the valve plate 5 is synchronized with the corresponding side blocking ring 11 to disengage contact, wherein the corresponding sealing ring 52 of the water inlet end of the valve body 1 bears the impact of the fluid and the scouring of impurities, in order to avoid its rapid wear, the protection mechanism 3 is linked and controlled by the actuator 2 to form a shielding protection to the sealing ring 52 towards the water inlet end. The above structure design not only ensures the flexibility of the rotation of the valve plate 5, but also enhances the sealing performance by staggering the arrangement of the blocking ring 11 and the sealing ring 52. The design of the integrated actuator 2 in the box body 4 further enhances the compactness of the butterfly valve.

[0054] As shown in the accompanying drawings Figures 5 to 7 The actuator 2 includes a hand wheel 21, a first rack 221, a first gear 222, a first connecting rod 231 and a second connecting rod 232. The first rack 221 is slidably assembled inside the box body 4, and the sliding guide structure can be that a guide sliding block is fixed on the inner wall of the box body 4, the limiting direction of the guide sliding block is parallel to the axis direction of the valve body 1, the guide sliding block is connected with a slide rail, and the first rack 221 is fixed on the surface of the slide rail, so that the sliding direction of the first rack 221 is parallel to the axis of the valve body 1. The first gear 222 is fixed on a connecting shaft 25 which is assembled and fixed on the bearing seat fixed inside the box body 4, and one end of the connecting shaft 25 is fixed with the first gear 222, so that the first gear 222 and the first rack 221 are in stable meshing state to transmit power.

[0055] As shown in the accompanying drawings Figures 5 to 7 One end of the first connecting rod 231 is fixed to the transmission shaft 51, and the two ends of the second connecting rod 232 are respectively connected with the first rack 221 and the first connecting rod 231. As a preferred structure, the slide rail and one end of the first rack 221 are also fixed with a connecting arm 233, and the second connecting rod 232 is connected with the connecting arm 233 to form a transmission structure connected with the first rack 221. The pivot connection structure involved in the embodiment can adopt a bolt or pin shaft connection form, and the bolt or pin shaft is used to axially limit the two parts connected with each other, so that the two parts can rotate around the axis of the bolt or pin shaft.

[0056] As shown in the accompanying drawings Figures 5 to 7One end of the handwheel 21 is fixed with the first rotating shaft 211. The first rotating shaft 211 passes through the side of the valve body 1 into the inside of the box 4. Specifically, bearing seats are fixed on the side walls on opposite sides of the box 4. The first rotating shaft 211 is adapted to be assembled in the corresponding two bearing seats. The bearing seats form axial limit and radial support for the first rotating shaft 211, so that the first rotating shaft 211 can rotate stably inside the box 4. The first rotating shaft 211 and the connecting shaft 25 form a transmission connection. When the operator turns the handwheel 21 to drive the first rotating shaft 211 to rotate, it can synchronously drive the first gear 222 to rotate. The first gear 222 drives the first rack 221 to move along a preset direction through meshing with the first rack 221. During this process, the first rack 221 pulls the second connecting rod 232 through the pivot point, so that the second connecting rod 232 links the first connecting rod 231 with the pivot point as the fulcrum, thereby driving the transmission shaft 51 to rotate around its own axis, realizing the synchronous rotation of the valve plate 5 to complete the opening or closing action of the butterfly valve.

[0057] The aforementioned actuator 2 integrates the handwheel 21 onto one side of the valve body 1, and designs the direction of movement of the transmission components along the line connecting the inlet and outlet ends of the valve body 1. This allows the handwheel 21 to be installed facing outwards when the butterfly valve needs to be installed against a wall or in other scenarios where the space for the handwheel 21 to rotate is limited. Compared to traditional butterfly valves where the handwheel 21 is close to a wall and difficult to rotate, this structure provides ample operating space for the operator, making the rotation of the handwheel 21 more convenient and effortless, effectively improving the adaptability and practicality of the butterfly valve in confined installation environments.

[0058] As attached Figure 7 , 9 As shown in Figure 10, a cavity is provided inside the valve plate 5. The protective mechanism 3 is integrated and arranged inside the cavity of the valve plate 5. As a preferred structural design, an opening is formed on one side of the cavity of the valve plate 5. The valve plate 5 is sealed and fixed at this opening by a detachable connection method using bolts, thereby achieving reliable sealing of the protective mechanism 3 after assembly. The protective mechanism 3 includes a first slider 31, a telescopic rod 32, a movable plate 33, a baffle 34, and a swing rod 35. The first slider 31 is limited and constrained to slide along the diameter line in the middle of the valve plate 5. Its specific limiting and constraining structure can be as follows: two first guide posts 311 are fixed inside the cavity of the valve plate 5. Both first guide posts 311 are parallel to the axis of the valve body 1. The first slider 31 is inserted through the two first guide posts 311 with a clearance fit. The two parallel first guide posts 311 form a limiting and guiding effect on the first slider 31, ensuring that the first slider 31 slides smoothly along the diameter line of the valve plate 5.

[0059] As attached Figure 12As shown, the baffle 34 is designed as an arc-shaped strip that matches the curvature of the valve plate 5, with an L-shaped cross-section to accommodate the sealing ring 52 located on the two outwardly perpendicular sides of the valve plate 5. Baffles 34 are fitted at both the upper and lower ends of the valve plate 5, and both baffles 34 are constrained to rotate concentrically relative to the valve plate 5 only. This rotational constraint can be achieved through the following... Figure 10 The structure shown features arc-shaped through slots 502 on both sides of the sealing plate 53. The trajectory of the through slots 502 is coaxial with the axis of the valve plate 5. Two connecting rods 341 are fixed to one side of the baffle 34. The ends of the two connecting rods 341 away from the baffle 34 are fixed to the connecting plate 342. Both connecting rods 341 are arranged along the radius line of the curvature of the baffle 34. At the position of the connecting rod 341 on the radius line of the baffle 34, a limiting pin 343 connects and fixes it to the connecting plate 342. During assembly, the limiting pin 343 is sequentially inserted through the sealing plate 53, the baffle 34, and the connecting plate 342 and then riveted to ensure that the limiting pin 343 and the through slot 502 fit together. In this linkage structure consisting of connecting rod 341, connecting plate 342, and limiting pin 343, the matching and engagement of the two limiting pins 343 with the through groove 502 strictly constrains the movement trajectory of the baffle 34 to only be able to rotate in a circle relative to the center of the sealing plate 53. After the sealing plate 53 is fixed to the valve plate 5 by bolts, the two baffles 34 are restricted to rotating coaxially relative to the valve plate 5. When the valve body 1 is opened, the two baffles 34 rotate precisely to the side facing the sealing ring 52 at the water inlet end of the valve cavity, so as to effectively shield the sealing ring 52 facing the water inlet end when the valve cavity is opened, avoiding impurities in the fluid from directly impacting and wearing the sealing ring 52. At the same time, the L-shaped cross-section design can improve the comprehensiveness of the shielding and further enhance the protective effect on the sealing ring 52.

[0060] As attached Figure 13 As shown, both baffles 34 and the first slider 31 are connected by a rocker arm 35 to form a linkage relationship. The two ends of the rocker arm 35 are pivotally connected to the baffles 34 and the first slider 31, respectively, and can rotate relative to each other. In this transmission structure, when the first slider 31 moves linearly along the first guide post 311, it transmits the driving force to the two baffles 34 synchronously through the rocker arm 35 connected at both ends. This synchronously drives the two connecting plates 342 to move along the trajectory formed by the through groove 502. The connecting plates 342 drive the baffles 34 fixed to them to rotate circumferentially around the axis of the valve plate 5. Finally, the two baffles 34 are spliced ​​on one side of the valve plate 5, realizing the shielding and protection of the sealing ring 52 and the resetting action of the baffles 34. This synchronous transmission structure, formed by the cooperation of a single slider and a rocker arm 35, ensures that the rotation angles of the two baffles 34 remain consistent, avoiding problems such as lag or deviation in unilateral action. It can promptly block the sealing ring 52 when the valve cavity is open and quickly avoid the sealing ring 52 before the valve cavity is closed. This ensures timely protection without interfering with the sealing action of the butterfly valve, effectively improving the reliability of the coordinated cooperation between the protection mechanism 3 and the main actuator 2 of the butterfly valve.

[0061] The transmission shaft 51 is internally penetrated along its axial line, and one end of the telescopic rod 32 is penetrated into the inside of the valve plate 5 along the penetration hole of the transmission shaft 51, and the other end extends into the inside of the box body 4. As a preferred sealing solution, an oil seal can be assembled in the penetration hole of the transmission shaft 51, and the dynamic sealing of the gap between the inside of the transmission shaft 51 and the telescopic rod 32 is realized through the elastic fitting of the oil seal, effectively preventing the fluid in the valve cavity from penetrating into the inside of the transmission shaft 51 and affecting the transmission components. Referring again to the drawings, Figure 5 and 13 The moving plate 33 is arranged in the inside of the box body 4 and is subjected to linear guide constraint, which can be realized by fixing two parallel guide rods 41 in the inside of the box body 4, and correspondingly fixing two linear bearings on the moving plate 33, and forming a sliding fit between the two guide rods 41 and the two linear bearings, so as to limit the moving plate 33 to move linearly relative to the valve body 1 along the guide rods 41.

[0062] Referring again to the drawings, Figure 13 One end of the moving plate 33 is fixedly connected to one end of the telescopic rod 32 located in the inside of the box body 4, and the specific connection manner can adopt fixing a shaft sleeve 331 on the moving plate 33, assembling a fixed bearing in the inside of the shaft sleeve 331, and assembling a circlip at the position of the telescopic rod 32 corresponding to the end surface of the bearing after the telescopic rod 32 penetrates into the bearing inner hole of the shaft sleeve 331, so as to form the axial abutment of the circlip and the end surface of the bearing and the radial positioning of the bearing by the shaft sleeve 331, thereby forming the double constraint of the moving plate 33 and the telescopic rod 32, so that the moving plate 33 can only realize synchronous axial movement with the telescopic rod 32, and cannot rotate circumferentially relative to the telescopic rod 32.

[0063] Referring again to the drawings, Figure 10 The other end of the moving plate 33 is fixedly connected with a second rack 241, and the first rotating shaft 211 is fixedly connected with a transmission gear 26, and the second rack 241 and the transmission gear 26 are stably meshed. When the operator rotates the hand wheel 21 to drive the first rotating shaft 211, the transmission gear 26 rotates synchronously and drives the second rack 241 to move linearly through the meshing, and the second rack 241 drives the moving plate 33 fixedly connected thereto to move synchronously, thereby driving the telescopic rod 32 to realize axial telescopic movement relative to the transmission shaft 51. In the specific transmission process, when the hand wheel 21 is rotated to drive the transmission gear 26 to rotate, the second rack 241 is moved in the guide direction and drives the telescopic rod 32 to perform telescopic action relative to the transmission shaft 51, the telescopic rod 32 transmits the linear motion to the first sliding block 31 in the inside of the valve plate 5, pushes the first sliding block 31 to move along the guide column, and the first sliding block 31 transmits the power to the baffle plate 34 through the swing rod 35 pivoted at both ends, drives the baffle plate 34 to swing towards the sealing ring 52, and until the shielding edges of the two baffle plates 34 completely cover and block the sealing ring 52 towards the water inlet end of the valve body 1.

[0064] Furthermore, to optimize the coordination of actions, a second gear 251 is fixed to the end of the connecting shaft 25 away from the first gear 222. The transmission gear 26 has a sector gear structure. When the handwheel 21 is operated to rotate the transmission gear 26 to open the valve plate 5, the transmission gear 26 first meshes with the second gear 251, driving the connecting shaft 25 and the first gear 222 to rotate and open the valve plate 5. After the valve plate 5 has rotated to the correct position, the transmission gear 26 disengages from the second gear 251 as the first rotating shaft 211 continues to rotate, and then meshes with the second rack 241 to drive the protective mechanism 3. This phased meshing structure design using sector gears controls the timing of the rotation of the valve plate 5 and the swing of the baffle 34, ensuring that the valve plate 5 completes the opening action first, and then the baffle 34 shields the sealing ring 52. This avoids interference between the two actions and provides timely protection for the sealing ring 52 when the valve cavity is fully open and the fluid flow rate is at its maximum, significantly improving the targeting and reliability of the protective mechanism 3.

[0065] When the telescopic rod 32 moves telescopically relative to the drive shaft 51, the synchronous movement of the first slider 31 can be achieved as shown in the attached figure. Figures 13 to 15 As shown, this is achieved through the linkage of the second slider 36. Specifically, a limit frame 321 is fixed at one end of the telescopic rod 32 located within the cavity of the valve plate 5. A second guide post 322 is fixed inside the limit frame 321, and the second guide post 322 is parallel to the axis of the valve body 1. The second slider 36 is fitted through the second guide post 322 with a clearance fit, and one side of the second slider 36 is close to the limit frame 321. The limiting effect of the limit frame 321 ensures that the second slider 36 can only slide linearly relative to the second guide post 322 and cannot flip. An inclined guide groove 501 is provided on the inner wall of the cavity of the valve plate 5, extending inclinedly upwards and outwards from the center of the valve plate 5. (See attached diagram.) Figure 16 A guide pin 361 is fixed to one side of the second slider 36. The guide pin 361 is fitted into the guide groove 501 and can slide along the groove. This structure, together with the limiting frame 321, forms a double constraint, further ensuring that the second slider 36 can only slide smoothly relative to the second guide post 322 without overturning. Preferably, a roller can be installed on the guide pin 361. The roller is embedded in the guide groove 501, which helps to improve the smoothness of the movement of the second slider 36.

[0066] To ensure that the valve plate 5 rotates to the open or closed state remains fixed, the valve body 1 bottom is installed fixed seat 13, the drive shaft 51 below the valve plate 5 via fixed seat 13 out, and the drive shaft 51 below the valve plate 5 in the gap between the fixed seat 13 assembly oil seal to achieve sealing and does not affect the rotation of the valve plate 5. Located below the valve plate 5 drive shaft 51 outer circumferential surface can be provided with two inwardly recessed fixed hole 511, two fixed hole 511 axis of the center line perpendicular to each other, and one of the fixed hole 511 axis of the center line parallel to the axis of the valve plate 5, fixed seat 13 side surface thread connection fixed bolt 14. When operating, first, the fixed bolt 14 is rotated out of the fixed hole 511 of the drive shaft 51, when the valve plate 5 rotates to the open state, one of the fixed hole 511 corresponding to the position of the fixed bolt 14, at this time, the fixed bolt 14 is screwed into the corresponding fixed hole 511 of the fixed seat 13, so that the valve plate 5 remains fixed open state; while the valve plate 5 rotates to the closed state, the other fixed hole 511 corresponding to the position of the fixed bolt 14, at this time, the fixed bolt 14 is screwed into the fixed hole 511 of the fixed seat 13, so that the valve plate 5 remains fixed closed state.

[0067] In addition, to avoid the second rack 241 and telescopic rod 32 under its own gravity subsidence, the box body 4 inside can also be configured to limit the components of its location. As shown in the accompanying Figures 18 to 22 The limiting component includes a column 381, a locking member 382 and a second spring 383. Among them, the column 381 is fixed to the inside of the box body 4 and close to one side of the second rack 241. The column 381 is provided with a hexagonal hole at a predetermined height close to the axis of the transmission gear 26, and the second rack 241 is provided with a first locking hole 2411 and a second locking hole 2412 on the side away from the transmission gear 26. The first locking hole 2411 corresponds to the position of the hexagonal hole when the telescopic rod 32 is lowered to drive the baffle 34 to return to the side away from the sealing ring 52, and the second locking hole 2412 corresponds to the position of the hexagonal hole when the telescopic rod 32 drives the baffle 34 to swing to completely block the sealing ring 52. The locking member 382 is designed as a hexagonal prism structure matched with the hexagonal hole, and the locking member 382 is fitted in the hexagonal hole in a clearance fit manner, which is constrained by the matching of the hexagonal hole and the hexagonal prism to be able to only move axially relative to the column 381. The locking member 382 is provided with an enlarged diameter portion 3821 close to one end of the second rack 241, and the end face of the enlarged diameter portion 3821 is provided with a locking pin 3822. The second spring 383 is sleeved outside the locking pin 3822, and the two ends of the second spring 383 abut against the end face of the column 381 and the side face of the enlarged diameter portion 3821 respectively. The second spring 383 continuously pushes the locking pin 3822 into the first locking hole 2411 or the second locking hole 2412 by the pre-tightening force, so as to reliably lock the second rack 241 and effectively prevent the second rack 241 and the telescopic rod 32 from subsiding due to gravity. The precise arrangement of the double locking holes realizes the positioning and locking in different working states.

[0068] The locking member 382 is fixed with a blocking plate 384 at the end away from the locking pin 3822, and the blocking plate 384 is fixed with a passive column 385 on the side facing the transmission gear 26. The transmission gear 26 is fixed with a pushing column 261 on both sides of the end face, and the pushing column 261 is a cylinder.

[0069] When the transmission gear 26 rotates in the forward direction to drive the second rack 241 to move, and in turn drive the telescopic rod 32 to move towards the box body 4, drive the first sliding block 31 to rotate the two blocking plates 34 to the position of shielding the sealing ring 52, the pushing column 261 in the front direction of the rotation direction first contacts the passive column 385, drives the locking pin 3822 to move away from the second rack 241, so that the second rack 241 is unlocked and can smoothly move under the drive of the transmission gear 26. Then the transmission gear 26 continues to rotate, drives the other pushing column 261 to pass through the passive column 385, until the blocking plate 34 is rotated to the position of completely shielding the sealing ring 52, at this time the second rack 241 is just moved to the position of coaxially aligning with the hexagonal hole, the locking pin 3822 is quickly inserted into the second locking hole 2412 under the pre-tightening force of the second spring 383, to realize the reliable locking of the second rack 241 and the telescopic rod 32 after the blocking plate 34 shields the sealing ring 52, and to ensure the stability of the protection state.

[0070] When the transmission gear 26 rotates in the reverse direction to drive the second rack 241 to move, and in turn drive the telescopic rod 32 to move towards the box body 4, drive the first sliding block 31 to rotate the two blocking plates 34 to the position of shielding the sealing ring 52 on the other side of the valve plate 5, the pushing column 261 in the front direction of the reverse direction first contacts the passive column 385, drives the locking pin 3822 to move away from the second rack 241, so that the second rack 241 is unlocked and can smoothly move under the drive of the transmission gear 26. Then the transmission gear 26 continues to rotate, drives the other pushing column 261 to pass through the passive column 385, until the blocking plate 34 is rotated to the position of completely shielding the sealing ring 52, at this time the second rack 241 is just moved to the position of coaxially aligning with the hexagonal hole, the locking pin 3822 is quickly inserted into the second locking hole 2412 under the pre-tightening force of the second spring 383, to realize the reliable locking of the second rack 241 and the telescopic rod 32 after the blocking plate 34 shields the sealing ring 52, and to ensure the stability of the protection state.

[0071] Referring again to the accompanying drawings Figure 16 and 17A third guide post 312 is fixed on the first slider 31, and a guide hole 362 is correspondingly provided on the second slider 36. The third guide post 312 is inserted into the guide hole 362 with a clearance fit, so that the linear movement of the second slider 36 can directly drive the first slider 31 to move synchronously. When the telescopic rod 32 moves axially, it drives the second guide post 322 to move synchronously. The second guide post 322, through its cooperation with the second slider 36, drives the second slider 36 to move along the inclined trajectory of the guide groove 501. The axial driving force of the telescopic rod 32 is converted into the lateral driving force of the first slider 31 along the diameter line of the valve plate 5 by utilizing the inclination angle of the guide groove 501, so that the second slider 36 stably pushes the first slider 31 to move, and finally realizes a precise and reliable linkage transmission between the telescopic rod 32 and the first slider 31.

[0072] The telescopic rod 32 can also move in conjunction with the transmission shaft 51, and the first slider 31 can move accordingly, as shown in the attached figure. Figure 9 As shown, this is achieved through the linkage of the third rack 371 and the third gear 372. Specifically, the third rack 371 is fixed to one end of the telescopic rod 32 located within the cavity of the valve plate 5. The rotatable third gear 372 is mounted inside the cavity of the valve plate 5 via a bearing seat. A fourth rack 373 is correspondingly fixed to the first slider 31. The third gear 372 simultaneously forms a stable meshing engagement with both the third rack 371 and the fourth rack 373. When the telescopic rod 32 moves axially, it drives the third rack 371 to move linearly. The third rack 371 drives the third gear 372 to rotate around its own axis through meshing transmission. During the rotation of the third gear 372, it simultaneously meshes with the fourth rack 373, driving the fourth rack 373 and the first slider 31 fixedly connected to it to move along a preset trajectory, ultimately achieving precise and reliable linkage transmission between the telescopic rod 32 and the first slider 31.

[0073] The outer diameter of the valve plate 5 is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate 5 is larger than the inner diameter of the retaining ring 11. This size design creates a preset gap between the annular surface of the valve plate 5 and the inner wall of the valve cavity. This gap provides a stable accommodating space for the baffle 34 without interfering with the sealing action of the sealing ring 52 and the retaining ring 11 when the valve plate 5 is closed. (See attached...) Figure 4, the same end of the two blocking rings 11 is connected to form an integrated structure through the filling portions 12, the transmission shaft 51 is arranged along the axial direction through the two filling portions 12, and the two ends of the valve plate 5 are both provided with a clearance slot 503, the clearance slot 503 is sleeved outside the filling portion 12 to rotate to realize rotation avoidance. Since the outer diameter of the valve plate 5 is smaller than the inner diameter of the valve cavity, there is a preset gap between the valve plate 5 and the inner wall of the valve cavity, when the valve plate 5 rotates to the valve cavity closing station, the filling portion 12 can form effective sealing for the gap between the valve plate 5 and the inner wall of the valve cavity at the both ends of the axial center line of the transmission shaft 51, which not only guarantees the smoothness of the rotation process of the valve plate 5, but also improves the sealing reliability of the butterfly valve as a whole through the gap sealing function of the filling portion 12, avoiding fluid leakage from the gap between the valve plate 5 and the inner wall of the valve cavity.

[0074] In addition, the two filling portions 12 are both provided with a clearance gap 121 corresponding to one side of the two blocking plates 34, when the valve plate 5 rotates to the valve cavity opening station, the blocking plate 34 smoothly passes through the clearance gap 121 of the filling portion 12 to realize the swing action. Further, in order to optimize the sealing performance, as shown in the accompanying drawings Figure 8 and 11 As shown in the accompanying drawings, the surface of the sealing plate 53 is fixed with a top plate 531 corresponding to the position of both ends of the transmission shaft 51, both top plates 531 are connected to the sealing piece 54, and the specific connection form is that one end of the sealing piece 54 is fixed with two connecting pins 541, the two connecting pins 541 are respectively arranged in the corresponding hole positions of the top plate 531, a spring is arranged between the top plate 531 and the connecting pin 541, and the first spring 542 is sleeved outside the connecting pin 541, and the elastic pre-tightening force of the first spring 542 is used to continuously push the sealing piece 54 to the outside of the valve plate 5. When the valve plate 5 rotates to abut against the blocking ring 11 to realize sealing, the sealing piece 54 can completely form sealing lamination with the clearance gap 121 of the filling portion 12, so as to seal the clearance gap 121. As a further preferred scheme, the side of the sealing piece 54 away from the sealing plate 53 can be pasted with a rubber pad, and the elastic deformation characteristics of the rubber pad are used to enhance the close-fitting tightness of the sealing piece 54 and the clearance gap 121, and further improve the sealing reliability of the butterfly valve as a whole.

[0075] The sealing piece 54 is provided with inclined guide surfaces 543 on both sides near one end of the outer side of the valve plate 5, which provide accurate guidance for the penetrating action of the baffles 34. When the butterfly valve is opened, after the valve plate 5 is rotated to the fully open position of the valve cavity, the two baffles 34 are driven to move through the clearance gap 121 under the action of the first sliding block 31. During the movement, the baffles 34 apply lateral thrust to the guide surfaces 543 of the sealing piece 54, pushing the sealing piece 54 to move towards the center of the valve plate 5, so that the baffles 34 can smoothly penetrate through the clearance gap 121 and finally move to the preset position of shielding the sealing ring 52. When the butterfly valve is closed, the two baffles 34 are driven to move reversely through the clearance gap 121 under the action of the first sliding block 31. Similarly, the sealing piece 54 is pushed to move towards the center of the valve plate 5 by abutting against the guide surfaces 543, thereby ensuring that the baffles 34 smoothly penetrate through the clearance gap 121 and reset to the side of the valve plate 5 where the sealing ring 52 is not arranged. After the baffles 34 completely pass through the sealing piece 54, the sealing piece 54 is stretched out to the outer side of the valve plate 5 and beyond the ring surface of the valve plate 5 under the elastic resetting force of the first spring 542, and then the valve plate 5 is rotated to the position where the sealing ring 52 is tightly pressed against the retaining ring 11 for sealing. At this time, the sealing piece 54 forms accurate sealing abutment with the clearance gap 121 of the filling part 12, effectively preventing fluid from penetrating through the clearance gap 121. In addition, the side of the sealing piece 54 away from the sealing plate 53 can be pasted with a rubber pad, and the elastic deformation characteristics of the rubber pad can enhance the close-fitting tightness of the sealing piece 54 and the clearance gap 121, thereby further improving the overall sealing reliability of the butterfly valve.

[0076] After adopting the above structure, the working method of the butterfly valve of the present application is as follows:

[0077] In the initial state, the valve plate 5 is in the sealing position of the valve cavity, the sealing rings 52 on both sides of the valve plate 5 are respectively tightly abutted against the retaining rings 11 on the corresponding sides of the valve cavity to achieve sealing, the baffles 34 of the protection mechanism 3 are located on the side of the valve plate 5 where the sealing ring 52 is not arranged, and the locking pin 3822 of the limiting assembly is inserted into the first locking hole 2411 of the second rack 241 under the pre-tightening force of the second spring 383, thereby achieving the initial locking of the second rack 241 and the telescopic rod 32.

[0078] When the butterfly valve is opened, the operator rotates the hand wheel 21, the hand wheel 21 drives the first rotating shaft 211 and the transmission gear 26 fixed on the first rotating shaft 211 to rotate synchronously, the transmission gear 26 is first engaged with the second gear 251 on the connecting shaft 25, thereby driving the connecting shaft 25 and the first gear 222 to rotate, the first gear 222 drives the first rack 221 to slide along the sliding rail through the engagement with the first rack 221, the second connecting rod 232 is pulled by the first rack 221 through the connecting arm 233, the second connecting rod 232 links the first connecting rod 231 with the first connecting rod 231 as a fulcrum, thereby driving the transmission shaft 51 and the valve plate 5 fixed on the transmission shaft 51 to rotate to the valve cavity opening position which is substantially parallel to the axis of the valve cavity.

[0079] The transmission gear 26 continues to rotate and disengages from the second gear 251, and instead engages with the second rack 241 on the moving plate 33 to drive the second rack 241 to move linearly along the guide rod 41. The second rack 241 drives the moving plate 33 to move synchronously, and the moving plate 33 drives the telescopic rod 32 to move relative to the transmission shaft 51 towards the box body 4. The telescopic rod 32 drives the first sliding block 31 to move, and in this process, the first sliding block 31 synchronously transmits power to the two baffles 34 through the two end-pivoted swing rods 35, drives the two baffles 34 to rotate around the axis of the valve plate 5, and the baffle 34 abuts against the guide surface 543 of the sealing piece 54 during the rotation process to push the sealing piece 54 to move towards the center of the valve plate 5, so that the baffle 34 smoothly passes through the displacement gap 121 of the filling part 12, and then blocks the sealing ring 52;

[0080] In the above process of opening the butterfly valve, the pushing column 261 on the end surface of the transmission gear 26 first contacts the passive column 385 of the limiting component, drives the passive column 385 and the locking piece 382 to move away from the second rack 241, so that the locking pin 3822 disengages from the first locking hole 2411 to release the initial locking, until the baffle 34 is completely rotated to the sealing ring 52 which is shielded towards the water inlet end of the valve cavity. At this time, the second locking hole 2412 of the second rack 241 is coaxially aligned with the hexagonal hole of the vertical column 381, the locking pin 3822 is inserted into the second locking hole 2412 under the pre-tightening force of the second spring 383, the locking of the second rack 241 and the telescopic rod 32 is achieved, and the baffle 34 remains in the shielding and protecting state of the sealing ring 52;

[0081] When closing the butterfly valve, the operator reversely rotates the hand wheel 21, the hand wheel 21 drives the first rotating shaft 211 and the transmission gear 26 to reversely rotate, the transmission gear 26 first engages with the second rack 241, the pushing column 261 on the end surface of the transmission gear 26 contacts the passive column 385 and drives the locking piece 382 to move, so that the locking pin 3822 disengages from the second locking hole 2412 to release the locking. The transmission gear 26 continues to drive the second rack 241 to reversely move, the second rack 241 drives the telescopic rod 32 to move towards the inside of the valve plate 5 through the moving plate 33, the telescopic rod 32 drives the first sliding block 31 to reversely move, the first sliding block 31 drives the two baffles 34 to reversely rotate to the side of the valve plate 5 which is not provided with the sealing ring 52 through the swing rod 35. At this time, the baffle 34 abuts against the guide surface 543 of the sealing piece 54 again during the reverse rotation process and pushes the sealing piece 54 to move, until the baffle 34 completely passes through the displacement gap 121 of the sealing piece 54 and the filling part 12. After that, the sealing piece 54 extends outwards relative to the valve plate 5 under the elastic restoring force of the first spring 542. At this time, the first locking hole 2411 of the second rack 241 is coaxially aligned with the hexagonal hole, and the locking pin 3822 is inserted into the first locking hole 2411 under the action of the second spring 383 to complete the locking;

[0082] The transmission gear 26 continuously reversely rotates with the first rotating shaft 211, disengages from the second rack 241, and engages with the second gear 251, thereby driving the connecting shaft 25, the first gear 222 and the first rack 221 to reversely move, and driving the first rack 221 to reversely rotate the transmission shaft 51 and the valve plate 5 through the second connecting rod 232 and the first connecting rod 231; the sealing rings 52 on both sides of the valve plate 5 are tightly attached to the corresponding side blocking rings 11, and the sealing sheets 54 are tightly attached to the displacement gaps 121 of the filling parts 12, thereby completing the closing and sealing of the butterfly valve.

[0083] The above method realizes the cooperative work of the opening and closing of the valve plate 5 and the protection of the sealing ring 52 by driving the hand wheel 21, and in the initial state, the valve plate 5 is sealed by the sealing ring 52 and the blocking ring 11, and the limiting assembly locks the telescopic rod 32 to avoid accidental displacement. When opening, the hand wheel 21 drives the transmission gear 26 to rotate, first engages with the second gear 251 to drive the valve plate 5 to rotate to the opening position, and is suitable for narrow space operation; then the gear switches to engage with the second rack 241, drives the telescopic rod 32 to link the baffle 34, the baffle 34 passes through the displacement gap 121 guided by the sealing sheet 54, precisely shields the water inlet end sealing ring 52 to prevent impurities from wearing, and at the same time, the limiting assembly is automatically unlocked and relocked after the baffle 34 is in place, preventing the components from falling. When closing, each component is reversely reset, the sealing sheet 54 automatically blocks the gap after the baffle 34 is disengaged, and finally the valve plate 5 is again tightly sealed by the sealing ring 52 and the blocking ring 11, the whole process timing is accurate, which is convenient to operate and improves the sealing reliability of the butterfly valve and the service life of the sealing ring 52.

[0084] The above is only a specific embodiment of the present application, but the design concept of the present application is not limited thereto, and any non-essential modification of the present application using the concept of the present application shall be deemed to infringe the protection scope of the present application.

Claims

1. A compact side-mounted butterfly valve, characterized in that, The butterfly valve includes: The valve body has an externally fixed box. Semi-circular retaining rings are provided on both sides of the valve cavity of the valve body, and the two retaining rings are staggered. A valve plate is fixed to a drive shaft. Semi-circular sealing rings are respectively provided on both sides of the valve plate. The two sealing rings are respectively located on both sides of the drive shaft. The valve plate is located in the valve body, and the drive shaft passes through the valve body to the housing body, so that the valve plate is restricted to rotate relative to the valve cavity. When the valve plate rotates to seal the valve cavity, the two sealing rings press against the two retaining rings respectively. An actuator includes a handwheel, a first rack, a first gear, a first connecting rod, and a second connecting rod. One end of the handwheel is fixed to a first rotating shaft, which passes through the side of the valve body into the housing. The first rack slides within the housing, with its sliding direction parallel to the axis of the valve body. The first gear rotates within the housing and meshes with the first rack. The rotation of the first rotating shaft drives the first gear to rotate. One end of the first connecting rod is fixed to the transmission shaft, and both ends of the second connecting rod are pivotally connected to the first rack and the first connecting rod, respectively. The protective mechanism includes a first slider, a drive shaft, a telescopic rod, a movable plate, a baffle, and a swing arm; The first slider is restricted to sliding along a diameter line in the middle of the valve plate; The baffle is an arc-shaped strip with an L-shaped cross-section. The baffle is provided at both the upper and lower ends of the valve plate. The two baffles are restricted to rotate coaxially relative to the valve plate. The baffle is located on the sealing ring side facing the water inlet end of the valve cavity after the valve body is opened. The baffle blocks the annular surface of the valve plate. The swing arm connects the baffle and the first slider, and the two ends of the swing arm are pivotally connected to the baffle and the first slider, respectively. The drive shaft runs through the interior along its axis, one end of the telescopic rod passes through the drive shaft to the interior of the valve plate, and the other end of the telescopic rod is located inside the box; The movable plate is located inside the box and is restricted to linear movement relative to the valve body. The movable plate and the telescopic rod are axially fixed at one end inside the box. The other end of the movable plate is fixed with a second rack. The first rotating shaft is provided with a transmission gear, and the second rack meshes with the transmission gear. When the handwheel is rotated, the first gear drives the first rack to move, the first rack pulls the second connecting rod, and the second connecting rod, in conjunction with the first connecting rod, drives the transmission shaft to rotate, causing the valve plate to rotate. Simultaneously, the rotation of the handwheel drives the transmission gear to rotate, causing the second rack to move and simultaneously extending the telescopic rod out of the valve body. The telescopic rod, in conjunction with the first slider, moves, causing the first slider to push the swing arm, causing the baffle to swing towards the sealing ring, until both baffles swing to block the sealing ring facing the water inlet end of the valve body.

2. The butterfly valve as described in claim 1, characterized in that, The slider is fixed inside the box, and the sliding direction of the slider is parallel to the axis of the valve body. The slider is adapted to connect to the slide rail. The first rack is fixed to the slide rail. A connecting arm is also fixed to one end of the slide rail. The second connecting rod is pivotally connected to the connecting arm.

3. The butterfly valve as described in claim 1, characterized in that, The protective mechanism also includes a second guide post and a second slider. The second guide post is fixed at one end of the telescopic rod inside the cavity of the valve plate. The second guide post is parallel to the axis of the valve body. The second slider passes through the second guide post with clearance fit. An inclined guide groove is provided on the inner wall of the cavity of the valve plate. A guide pin is provided on one side of the second slider. The guide pin is adapted to slide in the guide groove. When the telescopic rod moves and drives the second guide post to move, the second guide post drives the second slider to move along the guide groove, so that the second slider pushes the first slider to move.

4. The butterfly valve as described in claim 3, characterized in that, The first slider fixes the third guide post, and the second slider is provided with a guide hole. The third guide post passes through the guide hole with a clearance fit, so that the second slider moves and pushes the first slider to move.

5. The butterfly valve as described in claim 1, characterized in that, The telescopic rod is fixed with a third rack inside the cavity of the valve plate. A rotatable third gear is provided inside the cavity of the valve plate. The first slider is fixed with a fourth rack. The third gear meshes with the third rack and the fourth rack. When the telescopic rod moves, it drives the third rack to move, which in turn drives the third gear to rotate. The third gear simultaneously drives the fourth rack to move, causing the first slider to move and push the rocker arm to swing the baffle towards the sealing ring until the two baffles swing to block the sealing ring facing the water inlet end of the valve body.

6. The butterfly valve according to any one of claims 1 to 5, characterized in that, The protective mechanism further includes a first guide post, two first guide posts are fixed in the cavity of the valve plate, and both first guide posts are parallel to the axis of the valve body. The first slider passes through the two first guide posts with a clearance fit.

7. The butterfly valve according to any one of claims 1 to 5, characterized in that, An opening is formed on one side of the cavity of the valve plate, and a sealing plate is sealed at this opening. Arc-shaped through slots are provided on both sides of the sealing plate, and both through slots are coaxial with the axis of the valve plate. Two connecting rods are fixed to one side of the baffle, and a connecting plate is fixed to the end of the two connecting rods away from the baffle. Both connecting rods are located on the radius line of the baffle, and the connecting rods located on the radius line of the valve plate are connected and fixed to the connecting plate by a limiting pin. The limiting pin is adapted to pass through the through slot.

8. The butterfly valve according to any one of claims 1 to 5, characterized in that, The box is equipped with a rotatable connecting shaft. One end of the connecting shaft is fixed to the first gear, and the other end of the connecting shaft is fixed to the second gear. The transmission gear is a sector gear. When the handwheel is rotated to open the valve plate and drive the transmission gear, the transmission gear first meshes with the second gear, and then the transmission gear meshes with the second rack.

9. The butterfly valve as described in claim 1, characterized in that, The outer diameter of the valve plate is smaller than the inner diameter of the valve cavity, and the outer diameter of the valve plate is larger than the inner diameter of the retaining ring. Both ends of the valve plate are provided with relief grooves. The two retaining rings are integrally formed, and the same end of the two retaining rings is connected to the filling part. The relief groove is rotated around the filling part.

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