Large-diameter butterfly valve with self-closing function

Abstract

The present application relates to the technical field of self-closing valve, in particular to a large-diameter butterfly valve with self-closing function, which comprises a mounting pipe, a sealing plate and a butterfly plate used in conjunction are arranged in the mounting pipe, the sealing plate and the butterfly plate are respectively composed of a first half sealing plate and a first half butterfly plate and a second half sealing plate and a second half butterfly plate arranged on the same side, a reset assembly is arranged on one side of the first half sealing plate, a limiting plate is arranged on the second half butterfly plate in the direction on the same side of the reset assembly on the first half sealing plate, wherein the reset assembly comprises a fixed pipe with an arc structure, a reset rod adapted to the structure of the fixed pipe is slidably arranged in the fixed pipe, a reset spring is arranged at one end of the reset rod in the fixed pipe, the "over-center flip" phenomenon caused by the medium pressure of the pipeline is effectively avoided by arranging the butterfly plate with a avoiding opening and the reset assembly, the reset rod is pushed by the reset spring, the butterfly plate returns to the initial position, and the automatic closing process is completed.

Description

Technical Field

[0001] The present invention relates to the technical field of self-closing valves, in particular to a large-caliber butterfly valve with a self-closing function. Background Art

[0002] A butterfly valve is a type of valve used in piping systems that controls the flow of fluids through a rotating disc (also known as a disc). Due to their simple structure, compact size, light weight, low cost, and rapid opening and closing, butterfly valves are widely used in various industries, such as chemical processing, water treatment, and food processing.

[0003] The butterfly valves currently on the market generally rely on manual rotation operations to achieve the opening and closing functions. However, given the inherent structural characteristics of butterfly valves, if an attempt is made to introduce a mechanism that automatically closes after use, it may face a significant technical difficulty: during the valve opening phase, once the butterfly disc rotates beyond its design limit (usually 90 degrees), the asymmetric force surface formed by the butterfly disc and the fluid flow direction will generate reverse torque under the action of the pipeline medium pressure, causing the butterfly disc to rotate in the opposite direction beyond the reference position, forming a 180° reverse deflection (i.e., "over-center flip" phenomenon). This unexpected flipping phenomenon not only seriously violates the normal working principle of the butterfly valve, but more importantly, it will pose a direct threat to the sealing performance of the valve, because the fit between the flipped butterfly disc and the valve seat will no longer be tight, resulting in a significant decrease in sealing efficiency and a significant increase in the risk of medium leakage.

[0004] Based on this, the present invention discloses a large-caliber butterfly valve with a self-closing function. Summary of the Invention

[0005] To address the problem, as proposed in the background art, that a butterfly valve with an automatic closing mechanism may "overturn in the neutral position" due to pipeline pressure during opening, thereby damaging the sealing performance and increasing the risk of medium leakage, the present invention provides a large-diameter butterfly valve with a self-closing function, comprising a mounting tube, in which a sealing plate and a butterfly plate are provided for use;

[0006] In this technical solution, in order to make the disc plate automatically reset after use;

[0007] As a further improvement of the present technical solution, the sealing plate and the butterfly plate are respectively composed of a first half sealing plate and a first half butterfly plate and a second half sealing plate and a second half butterfly plate arranged on the same side; a reset assembly is provided on one side of the first half sealing plate, and a limit plate is provided on the second half butterfly plate in the direction of the same side as the reset assembly on the first half sealing plate; wherein the reset assembly includes a fixed tube with an arc structure, a reset rod adapted to the fixed tube structure is slidably provided in the fixed tube, and a reset spring is provided at one end of the reset rod located in the fixed tube;

[0008] The limit plate squeezes the smooth end surface of the reset rod, compressing the reset spring to store energy; after loosening the rotary handle, the spring releases energy to push the reset rod to abut the limit plate and the second half of the butterfly plate, driving the butterfly plate to reset in the opposite direction, realizing rapid valve closing without external power.

[0009] In addition, in the reset mechanism, the wedge-shaped end face of the reset rod and the limit plate form a progressive thrust, which, combined with the physical limit of the avoidance mouth, completely blocks the butterfly disc's flipping path over the mid-position.

[0010] On this basis, if the disc plate rotates beyond the center position during use, there is a risk of flipping under the action of pipeline pressure;

[0011] As a further improvement of the present technical solution, the limit plate has an arc-shaped structure, and its upper and lower ends are arranged away from the rotating rod; the fixed tube and the limit plate form a flow port that is compatible with the sealing plate and the butterfly plate; in the initial state, the top end of the reset rod is in contact with the top end of the limit plate; when the butterfly plate is rotated 90 degrees, the upper and lower ends of the limit plate are in contact with the upper and lower ends of the fixed tube, and one side of the second half butterfly plate is in contact with the top end of the fixed tube, and the reset rod is located inside the fixed tube.

[0012] In another solution, in order to ensure a certain degree of sealing under the premise of automatic reset, the pressure of the pipeline itself is fully utilized;

[0013] As a further improvement of the present technical solution, a rotating rod is provided in the mounting tube perpendicular to its axial rotation, the first half sealing plate and the second half sealing plate are symmetrically arranged on both sides of the rotating rod, the first half sealing plate and the second half sealing plate are fixedly connected to the inner wall of the mounting tube, and the first half sealing plate and the second half sealing plate are rotatably connected to the rotating rod, and the first half butterfly plate and the second half butterfly plate are symmetrically fixed on both sides of the rotating rod.

[0014] In addition, the first half sealing plate and the second half sealing plate are both provided with a conical groove, and the grooves of the first half sealing plate and the second half sealing plate are arranged in an obliquely symmetrical layout. The contact surfaces of the first half butterfly plate and the second half butterfly plate with the first half sealing plate and the second half sealing plate are wedge-shaped inclined surface structures adapted to the first half butterfly plate and the second half butterfly plate. The upper and lower ends of the first half butterfly plate and the second half butterfly plate in contact with the rotating rod are both provided with avoidance openings on the side away from the corresponding grooves on the first half sealing plate and the second half sealing plate. Both sides of the top of the reset rod are wedge-shaped structures, and the side of the reset rod that fits with the limit plate is a smooth structure. The upper and lower ends of the fixed tube are arranged away from the rotating rod.

[0015] By designing the butterfly plate and the sealing plate as a symmetrical split structure, both are arranged in a skew symmetry around the rotating rod, and the contact surface is adapted to the wedge-shaped slope and the conical groove, the split design decomposes the butterfly plate movement into two independent strokes, the symmetrical stress offsets the asymmetric fluid dynamic load, avoids the butterfly plate from being deflected in the opposite direction due to the medium pressure after exceeding 90 degrees, and the wedge-shaped slope is accurately embedded in the sealing plate groove when the butterfly plate resets, forming a multi-stage sealing surface, the sealing pair contact pressure is uniformly distributed, and the medium leakage is effectively prevented.

[0016] Compared with the prior art, the beneficial effects of the present application are:

[0017] 1. In the large-diameter butterfly valve with self-closing function, the over-center turning is prevented, and the sealing performance is improved. The butterfly plate with a avoiding port and the reset component are arranged to ensure that the butterfly plate does not exceed 90 degrees during rotation. The reset rod in the reset component elastically expands and contracts in the fixed pipe, and is elastically reset by the reset spring, effectively avoiding the "over-center turning" phenomenon caused by the medium pressure in the pipeline, ensuring the close fit between the butterfly plate and the sealing plate, thereby improving the sealing performance of the valve and reducing the risk of medium leakage. Overall, the safety and reliability of the valve are improved.

[0018] 2. In the large-diameter butterfly valve with self-closing function, the automatic reset function is enhanced to ensure safe closing. After the staff releases the rotating handle, the reset component pushes the reset rod through the reset spring, so that the butterfly plate returns to the initial position and completes the automatic closing process, ensuring that the butterfly valve can automatically reset and close after use. Even in the absence of human operation, it can quickly cut off the fluid supply, improving the safety of the system. In addition, the design of the limiting plate further limits the rotation range of the butterfly plate to prevent excessive rotation.

[0019] 3. In the large-diameter butterfly valve with self-closing function, the conical structure groove on the sealing plate is adapted to the wedge-shaped slope structure of the butterfly plate to form a close fit. At the same time, the smooth structure design of the reset rod and the limiting plate reduces the friction loss between the components, not only enhances the sealing effect of the butterfly valve, but also prolongs its service life, reduces maintenance costs, and improves the durability of the overall equipment. In particular, the wedge-shaped slope structure and the conical groove design make the sealing more reliable and reduce the possibility of leakage. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present application;

[0021] Figure 2 It is a schematic diagram of the internal structure of the mounting pipe of the present application;

[0022] Figure 3 It is an exploded view of the structure of the butterfly plate of the present application;

[0023] Figure 4 This is a structural schematic diagram of a sealing plate of the present invention;

[0024] Figure 5 This is the second structural schematic diagram of the sealing plate of the present invention;

[0025] Figure 6 This is a structural schematic diagram of the butterfly plate of the present invention;

[0026] Figure 7 This is the second structural diagram of the butterfly plate of the present invention;

[0027] Figure 8 The third structural diagram of the butterfly plate of the present invention;

[0028] Figure 9 It is a structural schematic diagram of the reset assembly of the present invention;

[0029] Figure 10 It is a structural cross-sectional view of the reset assembly of the present invention;

[0030] Figure 11 It is a structural schematic diagram of the reset rod of the present invention;

[0031] Figure 12 This is a schematic diagram of the state of the butterfly plate of the present invention;

[0032] Figure 13 This is the second schematic diagram of the butterfly plate of the present invention;

[0033] Figure 14 The third state diagram of the butterfly plate of the present invention is shown.

[0034] The meaning of each number in the figure is:

[0035] 1. Mounting tube; 2. First half of butterfly plate; 3. Second half of butterfly plate; 4. Limit plate; 5. Rotating rod; 6. Rotating handle; 7. First half of sealing plate; 8. Second half of sealing plate; 9. Avoidance; 10. Fixing tube; 11. Reset rod; 12. Reset spring. DETAILED DESCRIPTION

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] Existing butterfly valves with automatic closing mechanisms may "over-center flip" due to pipeline pressure during the opening process, thereby destroying the sealing performance and increasing the risk of medium leakage.

[0038] For this purpose, the present invention provides a large-caliber butterfly valve with a self-closing function. Figures 1-3 As shown, it includes a mounting tube 1, in which a rotating rod 5 is provided for rotation perpendicular to its axial direction, and a rotating handle 6 is provided on one end of the rotating rod 5 located outside the mounting tube 1. A sealing plate is fixed in the mounting tube 1, and a butterfly plate is rotatably provided to match the sealing plate structure and used in conjunction with it, and a circular flow opening is formed in the middle of the sealing plate.

[0039] For details, see Figure 3 As shown, the sealing plate is composed of a first half sealing plate 7 and a second half sealing plate 8 symmetrically arranged on both sides of the rotating rod 5. The first half sealing plate 7 and the second half sealing plate 8 are fixedly connected to the inner wall of the mounting tube 1, and the first half sealing plate 7 and the second half sealing plate 8 are rotatably connected to the rotating rod 5. A circular flow opening is formed in the center of the first half sealing plate 7 and the second half sealing plate 8.

[0040] For further information, see Figures 4-5 As shown, the first half sealing plate 7 and the second half sealing plate 8 are both provided with conical grooves, and the grooves of the first half sealing plate 7 and the second half sealing plate 8 are arranged in an obliquely symmetrical arrangement.

[0041] For further information, see Figure 3 and Figures 6-8 As shown, the butterfly plate is composed of a first half butterfly plate 2 and a second half butterfly plate 3 symmetrically fixed on both sides of the rotating rod 5, and the first half butterfly plate 2 and the second half butterfly plate 3 are arranged on the same side of the first half sealing plate 7 and the second half sealing plate 8 respectively. The contact surface between the first half butterfly plate 2 and the second half butterfly plate 3 and the first half sealing plate 7 and the second half sealing plate 8 is a wedge-shaped inclined surface structure adapted to the first half butterfly plate 2 and the second half butterfly plate 3. Figure 2 and Figure 12 It can be seen from the working process of the butterfly plate that when the butterfly plate is reset, the wedge-shaped inclined surface structure on the periphery of the butterfly plate can be snapped into the groove on the corresponding sealing plate, and the grooves and wedge-shaped inclined surface structures of the sealing plate and the butterfly plate are all arranged in an obliquely symmetrical layout, so that the butterfly plate can be rotated out when in use, and cooperate with the avoidance opening 9 opened at the end of the butterfly plate below to prevent the butterfly plate from rotating more than 90 degrees; and after the butterfly plate rotates in the opposite direction and resets, it can synchronously fall into the corresponding groove to achieve sealing.

[0042] Secondly, if Figure 7 and Figure 8As shown, the upper and lower ends of the first half butterfly plate 2 and the second half butterfly plate 3 in contact with the rotating rod 5 are both provided with avoidance openings 9 on the side away from the corresponding grooves on the first half sealing plate 7 and the second half sealing plate 8. In this way, when the butterfly plate rotates, the upper and lower ends of the first half butterfly plate 2 and the second half butterfly plate 3 will not hinder the rotation of the butterfly plate as a whole, and the butterfly plate can be limited by the first layer after rotating 90 degrees, so that the ends of the first half butterfly plate 2 and the second half butterfly plate 3 are in contact with the ends of the first half sealing plate 7 and the second half sealing plate 8.

[0043] That is to say, by designing the butterfly plate and the sealing plate into a symmetrical split structure, the butterfly plate is composed of the first half butterfly plate 2 and the second half butterfly plate 3, and the sealing plate is composed of the first half sealing plate 7 and the second half sealing plate 8, both of which are arranged obliquely symmetrically with the rotating rod 5 as the center, and the contact surface adopts an adaptive wedge-shaped inclined surface and a conical groove, which achieves the elimination of over-center flipping. The split design decomposes the butterfly plate movement into two independent strokes, and the symmetrical force offsets the asymmetric fluid dynamic load (the reverse torque in the background technology), avoids the reverse deflection of the butterfly plate due to the medium pressure after exceeding 90°, and enhances the sealing performance: when the butterfly plate is reset, the wedge-shaped inclined surface is accurately embedded in the sealing plate groove to form a multi-stage sealing surface, and the contact pressure of the sealing pair is evenly distributed, effectively preventing medium leakage (compared with the sealing failure problem in the background technology).

[0044] See also Figure 2 、 Figure 3 and Figures 9-11 As shown, in order to allow the entire butterfly plate to automatically reset after rotation without causing the butterfly plate to flip over in the middle position, a reset component is provided on one side of the first half sealing plate 7, and a limit plate 4 is provided on the second half butterfly plate 3 in the direction of the same side as the reset component on the first half sealing plate 7. The fixed tube 10 and the limit plate 4 form a flow port adapted to the sealing plate and the butterfly plate.

[0045] Specifically, the reset assembly includes a fixed tube 10 with an arc-shaped structure, in which a reset rod 11 adapted to the structure of the fixed tube 10 is slidably arranged. A reset spring 12 is provided at one end of the reset rod 11 located in the fixed tube 10, so that the reset rod 11 can elastically extend and slide in the fixed tube 10.

[0046] Among them, the limit plate 4 has an arc-shaped structure, and its upper and lower ends are arranged away from the rotating rod 5, and the upper and lower ends of the fixed tube 10 are also arranged away from the rotating rod 5, so that the entire butterfly plate can be rotated 90 degrees. In addition, both sides of the top of the reset rod 11 are wedge-shaped structures, and the side where the reset rod 11 fits with the limit plate 4 is a smooth structure. That is to say, when the butterfly plate rotates 90 degrees, the end of the limit plate 4 will first squeeze the smooth structure part of the reset rod 11, and then one side of the second half butterfly plate 3 continues to squeeze the reset rod 11 until the reset rod 11 enters the fixed tube 10.

[0047] In other words, the return rod 11 elastically expands and contracts within the fixed tube 10 via the return spring 12, linking the stop plate 4 and the second half of the butterfly disc 3. When the butterfly disc is open, the stop plate 4 presses against the smooth end surface of the return rod 11, compressing the return spring 12 to store energy. When the rotary handle 6 is released, the spring releases energy, pushing the return rod 11 against the stop plate 4 and the second half of the butterfly disc 3, driving the butterfly disc to reset in the opposite direction. This achieves forced automatic reset, with the spring energy synergistically acting with the medium pressure to achieve rapid valve closing without external power (in response to the fail-safe requirement in the background art), as well as dual protection against overturning. The wedge-shaped end surface of the return rod 11 and the stop plate 4 form a progressive thrust, which, combined with the physical limit of the avoidance opening 9, completely blocks the butterfly disc from overturning past the neutral position.

[0048] In addition, the sealing plate groove and the butterfly plate wedge-shaped inclined surface are arranged obliquely symmetrically. During the resetting process, the medium pressure acts on the asymmetric surface of the butterfly plate to form an auxiliary resetting torque, realizing the superposition of fluid power and spring force, significantly reducing the driving force required for resetting (compared with the high energy consumption defect of traditional self-closing valves). The medium pressure pushes the wedge surface of the butterfly plate to fit closely with the groove, dynamically compensating for the wear gap of the sealing pair and maintaining the sealing efficiency for a long time.

[0049] The specific process is, Figure 2 and Figures 12-14 As shown, in the initial state, the top of the reset rod 11 is in contact with the top of the limit plate 4;

[0050] When the butterfly plate rotates 90 degrees, the upper and lower ends of the limit plate 4 fit in with the upper and lower ends of the fixed tube 10, and one side of the second half butterfly plate 3 fits in with the top of the fixed tube 10;

[0051] After the staff releases the rotating handle 6, the reset rod 11 begins to elastically reset under the action of the reset spring 12, and then the top of the reset rod 11 will press against one side of the second half butterfly plate 3 and gradually rotate, and then press against the end of the limit plate 4 to cause the butterfly plate to continue rotating until the butterfly plate is reset;

[0052] In addition, combined with the fitting and limiting effect of the end of the limit plate 4 and the fixed tube 10, the butterfly plate will not flip over beyond the center position. Secondly, when the butterfly plate is reset when the reset rod 11 presses against the end of the limit plate 4 and one side of the second half butterfly plate 3, once the butterfly plate is reset and rotated to a certain angle, the pressure of the medium in the mounting tube 1 will also synchronously push the second half butterfly plate 3 to rotate, and the auxiliary butterfly plate will gradually reset, ensuring that the entire butterfly valve can automatically reset and close the circulation after use.

[0053] In summary, by providing a first half butterfly plate 2 and a second half butterfly plate 3 with a bypass port 9, and a reset assembly (including a fixed tube 10, a reset rod 11 and a reset spring 12), the large-diameter butterfly valve effectively prevents the occurrence of the "over-center flip" phenomenon, significantly improves the sealing performance, and reduces the risk of medium leakage. At the same time, the elastic reset function of the reset assembly ensures that the butterfly valve can automatically close after use, thereby improving the safety and reliability of the system. The optimized structural design not only enhances the sealing effect, but also extends the service life of the equipment and reduces maintenance costs. In addition, the design of medium pressure-assisted reset further improves the reset efficiency, allowing the butterfly valve to operate stably under various complex working conditions, thereby effectively solving the problem that the existing butterfly valve that introduces an automatic closing mechanism may cause "over-center flip" due to pipeline pressure during the opening process, thereby destroying the sealing performance and increasing the risk of medium leakage.

[0054] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-caliber butterfly valve with a self-closing function, comprising a mounting tube (1), wherein a sealing plate and a butterfly plate are provided in the mounting tube (1), and characterized in that: The sealing plate and the disc plate are both set in half, and the sealing plate and the disc plate are arranged crosswise, and the fitting parts of the sealing plate and the disc plate are concave and convex structures respectively; The edges of the sealing plate and the disc plate on the same side are respectively provided with an elastic telescopic rod and a limit plate (4) of a structurally compatible arc structure; The limiting plate (4) squeezes the elastic telescopic rod through the rotation of the disc plate, and the limiting plate (4) fits the elastic telescopic rod after the disc plate rotates to a certain angle; The sealing plate comprises a first half sealing plate (7) and a second half sealing plate (8), and the butterfly plate comprises a first half butterfly plate (2) and a second half butterfly plate (3), wherein: The first half sealing plate (7) and the first half butterfly plate (2) are arranged on the same side; The second half sealing plate (8) and the second half butterfly plate (3) are arranged on the same side; A reset assembly is provided on one side of the first half sealing plate (7), and a limit plate (4) is provided on the second half butterfly plate (3) in the direction of the same side as the reset assembly on the first half sealing plate (7); The reset assembly comprises a fixed tube (10) with an arc-shaped structure, a reset rod (11) adapted to the structure of the fixed tube (10) being slidably arranged in the fixed tube (10), and a reset spring (12) being arranged at one end of the reset rod (11) located in the fixed tube (10); A rotating rod (5) is provided in the mounting tube (1) for rotation perpendicular to the axial direction thereof, and a rotating handle (6) is provided on one end of the rotating rod (5) located outside the mounting tube (1); the first half sealing plate (7) and the second half sealing plate (8) are symmetrically arranged on both sides of the rotating rod (5), the first half sealing plate (7) and the second half sealing plate (8) are fixedly connected to the inner wall of the mounting tube (1), and the first half sealing plate (7) and the second half sealing plate (8) are rotationally connected to the rotating rod (5), and the first half butterfly plate (2) and the second half butterfly plate (3) are symmetrically fixed on both sides of the rotating rod (5).

2. The large-caliber butterfly valve with self-closing function according to claim 1 is characterized in that: The limiting plate (4) has an arc-shaped structure, and its upper and lower ends are arranged away from the rotating rod (5); The fixed tube (10) and the limiting plate (4) form a flow opening that is compatible with the sealing plate and the butterfly plate.

3. The large-diameter butterfly valve with self-closing function according to claim 1 is characterized in that: The first half sealing plate (7) and the second half sealing plate (8) are both provided with conical grooves, and the grooves of the first half sealing plate (7) and the second half sealing plate (8) are arranged in an obliquely symmetrical manner.

4. The large-diameter butterfly valve with self-closing function according to claim 3 is characterized in that: The contact surfaces between the first half butterfly plate (2) and the second half butterfly plate (3) and the first half sealing plate (7) and the second half sealing plate (8) are wedge-shaped inclined surface structures adapted to the first half butterfly plate (2) and the second half butterfly plate (3).

5. The large-diameter butterfly valve with self-closing function according to claim 4 is characterized in that: At the upper and lower ends of the first half butterfly plate (2) where the first half butterfly plate (2) contacts the rotating rod (5), a side away from the corresponding groove of the first half sealing plate (7) is provided with an escape opening (9); At the upper and lower ends of the second half butterfly plate (3) where the second half butterfly plate (3) contacts the rotating rod (5), a side away from the corresponding groove of the second half sealing plate (8) is provided with an avoidance opening (9).

6. The large-caliber butterfly valve with self-closing function according to claim 1, characterized in that: Both sides of the top of the reset rod (11) are wedge-shaped structures, and the side of the reset rod (11) that fits the limit plate (4) is a smooth structure.

7. The large-diameter butterfly valve with self-closing function according to claim 6, characterized in that: The upper and lower ends of the fixed tube (10) are arranged away from the rotating rod (5).

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