Valve body

Abstract

The utility model discloses a valve body, which belongs to the technical field of valve bodies, solves the problem that a diaphragm valve head is easy to wear due to the fact that particulate matters on a valve seat are difficult to scour, and adopts the technical scheme that the valve body mainly comprises a valve main body, the valve seat, the diaphragm valve head and a flow channel are arranged in the valve main body, and the valve seat is used for separating the flow channel; the valve body is further provided with a driving assembly, the driving assembly drives the diaphragm valve head to move so as to control opening and closing of the flow channel, the valve seat is provided with a first sealing part, the diaphragm valve head is provided with a second sealing part, and the first sealing part and the second sealing part abut against each other so that the valve seat can be closed. The second sealing part is provided with an abutting part abutting against the first sealing part, a first to-be-abutted area is arranged on the upper side of the abutting part, and in the first to-be-abutted area, the included angle between the first sealing part with the same height and the vertical face is larger than the included angle between the second sealing part and the vertical face. The utility model is mainly used for reducing the aggregation of particulate matters on the first sealing part.

Description

Technical Field

[0001] The utility model relates to the technical field of valve bodies, in particular to a valve body. Background Art

[0002] A valve body is a control component in a pipeline fluid transportation system. It is used to change the passage cross-section and the flow direction of the medium, and has functions such as diversion, cutoff, regulation, throttling, check, shunt or overflow pressure relief, etc. In the prior art, a valve body generally includes a valve main body, in which a valve seat, a diaphragm valve head and a driving component are provided. The driving component controls the reciprocating movement of the diaphragm valve head to change the distance between the diaphragm valve head and the valve seat, so as to realize the opening and closing of the flow passage. When the flow passage is closed, the diaphragm valve head contacts the valve seat to realize the sealing fit between the diaphragm valve head and the valve seat.

[0003] In an on-off valve, how to ensure the continuous and stable sealing of the valve body has always been a research direction. Compared with surface sealing, a line sealing structure generally has a better sealing effect. Therefore, at present, many valve bodies are provided with annular protrusions on the valve core or the valve seat to realize the line sealing of the valve body. However, when the liquid in the valve body is a liquid containing solid particles, such as grinding fluid, etc., during the opening and closing process of the valve body, the solid particles adhere to the line sealing part or its vicinity, which will easily cause wear of the line sealing part, and then lead to sealing failure of the valve body. And when the solid particles adhere to the vicinity of the annular protrusion, it is difficult for the fluid flow to carry away the solid particles in the sealing area and its vicinity. Summary of the Utility Model

[0004] The purpose of the utility model is to solve the problem that the particulate matter in the sealing area and its vicinity is difficult to be washed away, resulting in easy wear of the sealing part between the diaphragm valve head and the valve seat. For this reason, a valve body is provided, which can effectively reduce the accumulation of particulate matter on the first sealing part.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A valve body, comprising:

[0007] A valve main body, in which a flow passage is provided;

[0008] A valve seat, arranged in the valve main body and separating the flow passage;

[0009] A diaphragm valve head, arranged in the valve main body and cooperating with the valve seat to control the opening and closing of the flow passage;

[0010] A driving component, used to control the movement of the diaphragm valve head;

[0011] A first sealing part is arranged on the valve seat, and a second sealing part is arranged on the diaphragm valve head. The first sealing part and the second sealing part are abutted against each other to close the valve seat;

[0012] When the valve body is closed, the second sealing portion at least partially extends into the inner side of the first sealing portion, and the first sealing portion and the second sealing portion have an abutting portion that abuts against each other. There is a first area to be abutted above the abutting portion. In the first area to be abutted, the angle between the first sealing portion and the vertical plane at the same height is greater than the angle between the second sealing portion and the vertical plane.

[0013] The beneficial effects of adopting the utility model are as follows:

[0014] In the utility model, the first area to be abutted is located above the abutting portion. In this case, the particulate matter attached to the first sealing portion will be more likely to fall off. And in the first area to be abutted, the angle between the first sealing portion and the vertical plane at the same height is greater than the angle between the second sealing portion and the vertical plane, that is, the slope of the first sealing portion is smaller than the slope of the second sealing portion. When the diaphragm valve head and the valve seat gradually separate from the contact state, the fluid will pass through the gap between the first sealing portion and the second sealing portion. Since the first sealing portion is entirely oriented towards the diaphragm valve head, the fluid can fully scour the entire first sealing portion, thereby scouring the particulate matter that may exist on the first sealing portion, effectively reducing the particulate matter attached to the first sealing portion, and thus reducing the possibility of the first sealing portion and the second sealing portion being worn by the particulate matter, contributing to improving the service life of the diaphragm valve head, and further maintaining the sealing performance between the diaphragm valve head and the valve seat. During the reciprocating movement of the diaphragm valve head, each time it detaches from or approaches the valve seat, the fluid can be used to scour the first sealing portion, thereby effectively preventing the accumulation of particulate matter on the first sealing portion and reducing the possibility of damage to the diaphragm valve head.

[0015] In addition, the upper side of the abutting part has a first abutment area. When the abutting part is worn and damaged or plastically deformed so that the first sealing part and the second sealing part are difficult to effectively seal, the diaphragm valve head can be pressurized to increase the descending stroke of the diaphragm valve head, so that the first sealing part and the second sealing part in the first abutment area are abutted, thereby realizing the formation of a new abutment sealing matching part between the first sealing part and the second sealing part, so that the sealing effect can continue to be achieved through the new sealing matching part after the sealing of the original abutment part fails, thereby avoiding the valve body from being unable to continue to be used due to damage to the original abutment part, thereby effectively extending the service life of the diaphragm valve head. Of course, at this time, at least one of the first sealing part and the second sealing part is preferably made of resin material, so that when the diaphragm valve head is pressurized, the original abutting part undergoes plastic deformation due to excessive deformation, and the original abutting part loses its elasticity, so that the original abutting part has a smaller force resisting the action between the diaphragm valve head and the valve seat, and the abutting force between the diaphragm valve head and the valve seat will be concentrated on the new abutting part of the two to ensure a good sealing effect between the two; if the first sealing part and the second sealing part are made of rubber or other materials, when the diaphragm valve head is pressurized, the original abutting part will greatly resist the abutting force between the diaphragm valve head and the valve seat due to its own elasticity, which will cause the pressure of the new abutting part to be smaller, making it difficult to achieve a good sealing effect.

[0016] Preferably, at least one of the first sealing part and the second sealing part is a convex curved surface structure, which can ensure that the structure is not prone to dead corners, thereby preventing particles from gathering in the dead corners and affecting the sealing of the first sealing part and the second sealing part.

[0017] Preferably, the first sealing part is a conical structure that is wide at the top and narrow at the bottom, and the side surface of the second sealing part is a convex curved surface structure. Using the above-mentioned technical solution, the first sealing part adopts a conical structure that is wide at the top and narrow at the bottom, so that the surface of the first sealing part is inclined, so that when the first sealing part is separated from the second sealing part, and the first sealing part and the second sealing part maintain a small gap, the flow rate of the liquid passing through the gap is relatively large, and it can flow along the first sealing part, so that the attachments on the first sealing part will be more easily washed away, so that when the first sealing part and the second sealing part are subsequently abutted, the abutting area between the two will not be easily worn due to the attachments. If the first sealing part is a convex curved surface structure, the scouring force of the liquid on the upper side of the first sealing part is relatively small, and if the first sealing part is a concave curved surface structure, it will be easier for particles to accumulate on the first sealing part.

[0018] Preferably, a second area to be abutted is provided on the lower side of the abutting portion. The angle between the first sealing portion and the vertical plane at the same height within the second area to be abutted is smaller than the angle between the second sealing portion and the vertical plane. With the foregoing technical solution, the second area to be abutted can enhance the strength of the lower side of the abutting portion, and thus can effectively enhance the anti-deformation ability of the abutting portion, reduce the possibility of deformation of the diaphragm valve head at the abutting portion, and contribute to improving the service life of the diaphragm valve head. At the same time, when there is no such second area to be abutted, when pressure is applied to the diaphragm valve head, the diaphragm valve head will directly bite into the first sealing portion, resulting in a large deformation of the first sealing portion and further affecting the sealing effect of the new abutting portion between the first sealing portion and the second sealing portion.

[0019] Preferably, a mutation portion is provided at a position of the second sealing portion within the second area to be abutted that is away from the central axis of the diaphragm valve head. With the foregoing technical solution, the mutation portion is located at a position of the second sealing portion away from the central axis of the diaphragm valve head, that is, the mutation portion is located at the peripheral edge of the diaphragm valve head and is close to the first sealing portion. When the diaphragm valve head is separated from the valve seat, the fluid will pass through the mutation portion. Under the action of the mutation portion, the fluid passing through the mutation portion will be turbulently flowed, and thus can effectively improve the scouring force of the fluid on the first sealing portion, make the particulate matter on the first sealing portion more easily washed off, improve the scouring effect of the fluid, and further reduce the amount of particulate matter on the first sealing portion.

[0020] Preferably, the bottom end surface of the diaphragm valve head is a plane, and the connection between the side edge and the bottom end surface of the diaphragm valve head forms the mutation portion. With the foregoing technical solution, the bottom end of the diaphragm valve head adopts a plane, which can effectively reduce the overall length of the diaphragm valve head, and thus can reduce the stroke required for the diaphragm valve head to completely separate from the valve seat, and can also reduce the length of the driving component in the movement direction of the diaphragm valve head, enabling the overall valve body to be small and compact. At the same time, it can also accelerate the speed at which the diaphragm valve head is completely opened, making the operation of the valve body more convenient. At the same time, when the gap between the first sealing portion and the second sealing portion is small, when the liquid passes through the valve body, turbulence will occur at the bottom end of the diaphragm valve head and when flowing through the mutation portion, so as to achieve a better scouring effect on the first sealing portion.

[0021] Preferably, the height difference between the top of the first sealing portion and the upper side of the abutting portion is smaller than the height difference between the lower side of the abutting portion and the bottom end of the first sealing portion. With the foregoing technical solution, the abutting portion is closer to the top of the first sealing portion, thereby reducing the area of the first sealing portion on the upper side of the abutting portion. When the second sealing portion abuts against the first sealing portion, the first sealing portion on the upper side of the abutting portion is the lowest point of the flow channel, and the particulate matter on the upper side of the valve seat is more likely to deposit and adhere to the first sealing portion. By reducing the area of the first sealing portion on the upper side of the abutting portion, the particulate matter on the first sealing portion can be reduced, and the possibility of friction between the abutting portion and the particulate matter can be reduced; in addition, reducing the area of the first sealing portion on the upper side of the abutting portion can also reduce the area to be scoured by the fluid. At the same time, the closer to the abutting portion, the greater the scouring force of the fluid, making the particulate matter easier to be washed off, thereby significantly improving the scouring effect of the fluid.

[0022] Preferably, the diaphragm valve head further has a convex portion on the upper side of the valve seat, and the minimum radius of the convex portion is greater than the maximum radius of the first sealing portion; and when the valve body is closed, the height difference between the maximum radius of the convex portion and the top end of the valve seat is H, and the difference between the maximum radius of the convex portion and the maximum radius of the first sealing portion is L, where L / H≥0.4. With the foregoing technical solution, the first sealing portion is entirely within the projection of the convex portion on the valve seat. The particulate matter on the upper side of the valve seat will be blocked by the convex portion during the sedimentation process, preventing the particulate matter from directly settling on the first sealing portion and reducing the possibility of particulate matter adhering to the first sealing portion; in addition, during the movement of the diaphragm valve head, the convex portion can push the nearby particulate matter to the outside away from the first sealing portion, further reducing the adhesion of particulate matter to the first sealing portion; secondly, satisfying L / H≥0.4 can avoid excessive H and too small L, preventing the particulate matter from floating to the first sealing portion and adhering to the first seal during the process of being blocked by the convex portion and continuing to descend, affecting the subsequent sealing effect.

[0023] Preferably, the maximum diameter of the second sealing portion is equal to the maximum diameter of the first sealing portion, and the angle between the first sealing portion and the vertical plane is α1, and the angle between the second sealing portion and the vertical plane is α2, where α1 - 10° ≤ α2 ≤ α1 + 10°. With the foregoing technical solution, the difference between the angle α1 and the angle α2 is 10°, and the angle α1 and the angle α2 are relatively close, that is, the first sealing portion and the second sealing portion are relatively close and easier to fit. When the abutting portion is damaged, only a small stroke of the diaphragm valve head needs to be moved to form an abutment between the first abutting area and the first sealing portion, thereby effectively reducing the stroke increment of the diaphragm valve head. When the difference between the two is too large, when forming a new abutting area of the same width, the diaphragm valve head needs to move downward a greater distance, and at the same time, a greater force needs to be applied to the diaphragm valve head.

[0024] Preferably, the valve seat and / or the diaphragm valve head are made of resin. The angle between the first sealing portion and the horizontal plane is β, and 63° > β > 27°, that is, arctan2 > β > arctan0.5. The resin material has good stability and is suitable for various liquids. Moreover, when the deformation amount at the contact between the first sealing portion and the second sealing portion is too large, plastic deformation will occur, and the wall surface elastic deformation resists the contact force between the first sealing portion and the second sealing portion. However, the structural strength of the resin material is lower than that of the metal material. With the aforementioned technical solution, the angle is β, which can make the component forces of the force received by the valve seat in the horizontal direction and the vertical direction relatively close, avoiding the component force in the horizontal direction exceeding twice the component force in the vertical direction, or the component force in the vertical direction exceeding twice the component force in the horizontal direction, thereby avoiding excessive deformation of the valve seat due to excessive force in the horizontal or vertical direction and helping to improve the service life of the valve seat.

[0025] Other features and advantages of the present utility model will be disclosed in detail in the following specific embodiments and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The following further describes the present utility model with reference to the drawings:

[0027] Figure 1 is a schematic structural diagram of a valve body of the present utility model;

[0028] Figure 2 is a cross-sectional view of a valve body of the present utility model;

[0029] Figure 3 is Figure 2 a partial enlarged view of part A in

[0030] Figure 4 is Figure 3 a partial enlarged view of part B in

[0031] Figure 5 is Figure 3 a partial enlarged view of part C in

[0032] Reference numerals: 1, valve body; 11, flow channel; 111, first flow channel; 112, second flow channel; 12, valve seat; 121, first region; 122, second region; 123, first sealing portion; 2, diaphragm valve head; 21, second sealing portion; 22, convex portion; 23, bottom end face; 231, mutation portion; 3, drive assembly; 4, first contact region to be; 5, second contact region to be; 6, contact portion. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] The technical solutions of the embodiments of the present utility model will be explained and described below in conjunction with the accompanying drawings of the embodiments of the present utility model. However, the following embodiments are only the preferred embodiments of the present utility model and not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present utility model.

[0034] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model.

[0035] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, "a plurality" means two or more unless otherwise clearly defined.

[0036] In the present utility model, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0037] As Figures 1 to 5 shown, this embodiment shows a valve body, including a valve main body 1. A valve seat 12, a diaphragm valve head 2 and a flow channel 11 are provided in the valve main body 1. The flow channel 11 includes a valve cavity, a first flow channel 111 and a second flow channel 112. Both the first flow channel 111 and the second flow channel 112 penetrate to the surface of the valve main body 1. The valve seat 12 divides the flow channel 11. The first flow channel 111 is communicated with the valve cavity through the valve seat, and the second flow channel 112 is directly communicated with the valve cavity. One of the first flow channel 111 and the second flow channel 112 is an inlet flow channel, and the other is an outlet flow channel.

[0038] The valve body 1 is also provided with a driving assembly 3, the output end of which is in transmission connection with the diaphragm valve head 2, and the driving assembly 3 controls the diaphragm valve head 2 to reciprocate, so that the diaphragm valve head 2 approaches or moves away from the valve seat 12, thereby controlling the opening and closing of the flow channel 11. Figure 4 , a first sealing portion 123 is provided on the valve seat 12, and a second sealing portion 21 is provided on the diaphragm valve head 2. The first sealing portion 123 and the second sealing portion 21 abut against each other to close the valve seat 12. When the valve body is closed, the flow channel 11 is closed by the diaphragm valve head 2 and the valve seat 12. Specifically, the second sealing portion 21 at least partially extends into the inside of the first sealing portion 123, and abuts against the first sealing portion 123. The abutting position of the two forms an abutting portion 6, and a first abutting area 4 is provided on the upper side of the abutting portion 6. In the first abutting area 4, the angle between the first sealing portion 123 and the vertical plane at the same height is greater than the angle between the second sealing portion 21 and the vertical plane.

[0039] Reference Figure 5 In this embodiment, the upper side of the abutting portion 6 has a first abutment area 4, and the first sealing portion 123 is inclined, so that the particles attached to the first sealing portion 123 will fall off more easily. At the same time, in the first abutment area 4, the angle between the first sealing portion 123 and the vertical plane at the same height is greater than the angle between the second sealing portion 21 and the vertical plane, that is, the slope of the first sealing portion 123 is smaller than the slope of the second sealing portion 21. When the diaphragm valve head 2 and the valve seat 12 gradually separate from the contact state, the fluid will pass through the gap between the first sealing portion 123 and the second sealing portion 21. Since the first sealing portion 123 is facing the diaphragm valve head 2 as a whole, the fluid can fully flush the entire first sealing portion 123, so that the first sealing portion 123 can be flushed. Flushing possible particles can effectively reduce the particles attached to the first sealing portion 123, thereby reducing the possibility of the diaphragm valve head 2 being worn by particles, helping to increase the service life of the diaphragm valve head 2, and thus maintaining the sealing performance between the diaphragm valve head 2 and the valve seat 12. During the reciprocating motion of the diaphragm valve head 2, each time it separates from the valve seat 12 or approaches the valve seat 12, the fluid can be used to flush the entire first sealing portion 123, thereby effectively preventing particles from gathering in the first sealing portion 123 and reducing the possibility of damage to the diaphragm valve head 2.

[0040] In the foregoing structure, when the abutting portion 6 is worn or plastically deformed, making it difficult to effectively seal between the first sealing portion 123 and the abutting portion 6, the diaphragm valve head 2 can be pressurized to increase the downward stroke of the diaphragm valve head 2, causing the first sealing portion 123 and the second sealing portion 21 to deform and increasing the area of mutual abutment. Specifically, the first sealing portion 123 in the first abutting region 4 abuts against the second sealing portion 21 to achieve the sealing fit between the first sealing portion 123 and the second sealing portion 21, enabling the diaphragm valve head 2 to continue to achieve a sealing effect through a new abutting portion after the original abutting portion 6 fails, preventing the valve body from being unable to continue to be used due to damage to the abutting portion 6, and thus effectively extending the service life of the diaphragm valve head 2. Of course, at this time, at least one of the first sealing portion 123 and the second sealing portion 21 is preferably made of a resin material, so that when the diaphragm valve head 2 is pressurized, the original abutting portion 6 undergoes plastic deformation due to excessive deformation, and the original abutting portion 6 loses its elasticity, so that the force of the original abutting portion 6 against the acting force between the diaphragm valve head 2 and the valve seat 12 is small, and the abutting force between the diaphragm valve head 2 and the valve seat 12 will be concentrated on their new abutting portion. At this time, since the new abutting portion is newly formed and has not been worn or plastically deformed before, it still has elasticity and can meet the sealing effect between the two; if the first sealing portion 123 and the second sealing portion 21 are made of materials such as rubber, when the diaphragm valve head 2 is pressurized, due to the elastic action of the original abutting portion, it will greatly resist the abutting force between the diaphragm valve head 2 and the valve seat 12, resulting in a small pressure on the new abutting portion and making it difficult to achieve a good sealing effect.

[0041] As Figure 2 and Figure 3 shown, in this embodiment, the valve seat 12 is provided with a through hole, and the flow channel 11 passes through the through hole to keep the first flow channel 111 and the second flow channel 112 in communication. The diaphragm valve head 2 is located above the valve seat 12. The first sealing portion 123 is arranged on the inner wall of the top end of the through hole, and the second sealing portion 21 is arranged on the outer peripheral side near the bottom end of the diaphragm valve head 2. The first sealing portion 123 has a tapered surface structure that is wider at the top and narrower at the bottom, and the second sealing portion 21 has a convex curved surface structure.

[0042] It should be noted that the top end of the first sealing portion 123 extends to the top surface of the valve seat 12, and the diameter of the first sealing portion 123 gradually decreases from the top surface of the valve seat 12 downward, that is, the diameter of the top end of the first sealing portion 123 is the largest, and the diameter of the bottom end of the first sealing portion 123 is the smallest. The first sealing portion 123 having a tapered surface structure can make the surface of the first sealing portion 123 inclined, and the particulate matter on the first sealing portion 123 is more likely to break away from the first sealing portion 123, which helps to reduce the amount of particulate matter attached to the first sealing portion 123.

[0043] In addition, the second sealing portion 21 adopts a convex surface structure, and the slope of the second sealing portion 21 changes along the axial direction of the diaphragm valve head 2. When the flow channel 11 is closed, that is, when the first sealing portion 123 and the second sealing portion 21 are abutted, the first sealing portion 123 and the second sealing portion 21 are abutted, and preferably remain tangent in the initial abutting area. The part where the second sealing portion 21 and the first sealing portion 123 abut each other is the abutting portion 6, and at this time, the contact area is small to form a line seal. The cooperation of the convex curved surface structure and the conical surface structure can effectively reduce the contact area between the first sealing part 123 and the second sealing part 21, ensuring a good sealing effect in the early stage. When the abutting part 6 is damaged due to wear caused by contact with particles or plastic deformation caused by long-term use, the diaphragm valve head 2 is pressurized again to increase the descending stroke of the diaphragm valve head 2. The first sealing part 123 and the second sealing part 21 in the first abutment area 4 can form a new abutment area, and the sealing between the two can be achieved through the new abutment area, rather than through the original abutment part. Especially when the fluid contains a large number of solid particles, the valve body can also ensure a good sealing effect when used.

[0044] Of course, it is understandable that in other embodiments, the first sealing portion 123 may also adopt a convex surface structure, and the second sealing portion 21 may also adopt a conical surface structure that is wide at the top and narrow at the bottom; or both the first sealing portion 123 and the second sealing portion 21 may adopt a convex surface structure.

[0045] In this embodiment, the part of the first sealing portion 123 that abuts against the second sealing portion 21 is the abutting portion 6. The height difference between the top of the abutting portion 6 and the top of the first sealing portion 123 is less than the height difference between the bottom of the abutting portion 6 and the bottom of the first sealing portion 123. When the flow channel 11 is in the closed state, that is, the first sealing portion 123 abuts against the abutting portion 6, the flow channel 11 is divided into an upper chamber and a lower chamber. The upper side of the abutting portion 6 is the lowest point of the upper chamber, and the lower side of the abutting portion 211 is the highest point of the lower chamber. During the sedimentation process of the particulate matter, the particulate matter in the upper chamber is more likely to accumulate on the first sealing portion 123 on the upper side of the abutting portion 6. In the lower chamber, since the first sealing portion 123 on the lower side of the abutting portion 6 is the highest point, the particulate matter is not easily attached. At the same time, when the valve body is opened or closed, the closer the first sealing portion 123 is to the upper side, the larger the distance formed with the diaphragm valve head, and the smaller the fluid flow rate. Therefore, when the area of the first sealing portion 123 on the upper side of the abutting portion 6 is too large, the first sealing portion 123 cannot be fully flushed by the fluid, resulting in particulate matter remaining on the first sealing portion 123. When too much particulate matter remains, it will fall downward to the vicinity of the abutting portion 6 and will cause the wear of the abutting portion 6 to intensify. In this embodiment, the abutting portion 6 is closer to the top of the first sealing portion 123, that is, it can avoid the area of the first sealing portion 123 on the upper side of the abutting portion 6 from being too large, so as to ensure that the first sealing portion 123 can be fully flushed and avoid the above situation.

[0046] As Figure 3 and Figure 4 shown, Figure 4 The dotted line in the figure is the upward virtual extension line at the maximum diameter of the first sealing portion 123. In this embodiment, the maximum diameter of the second sealing portion 21 is equal to the maximum diameter of the first sealing portion 123, so that at the limit position, the highest points of the first sealing portion 21 and the second sealing portion 123 just come into contact with each other.

[0047] As Figure 5As shown, in this embodiment, a second area to be abutted 5 is provided below the abutting part 6. The angle between the first sealing part 123 and the vertical plane at the same height in the second area to be abutted 5 is smaller than the angle between the second sealing part 21 and the vertical plane. When the abutting part 6 abuts against the first sealing part 123, there is a gap between the second area to be abutted 5 and the first sealing part 123, and the second area to be abutted 5 will not contact the first sealing part 123 to affect the sealing fit between the abutting part 6 and the first sealing part 123. At the same time, the second area to be abutted 5 can enhance the strength of the lower side of the abutting part 6, thereby effectively enhancing the anti-deformation ability of the abutting part 6, reducing the possibility of deformation of the diaphragm valve head 2 at the abutting part 6, and contributing to improving the service life of the diaphragm valve head 2. If there is no second area to be abutted 5, when the diaphragm valve head 2 is under pressure, its bottom end will be prone to downward deformation and present a shape with the bottom end protruding downward. In this case, it will drive the second sealing part 21 to deform, thereby affecting the sealing effect between the first sealing part 123 and the second sealing part 21.

[0048] As Figure 4 and Figure 5 shown, in this embodiment, a mutation part 231 is provided at a position of the second sealing part 21 in the second area to be abutted 5 away from the central axis of the diaphragm valve head 2. The mutation part 231 is located at the connection between the side of the diaphragm valve head 2 and the bottom end face 23 of the diaphragm valve head 2, and the top end face of the diaphragm valve head 2 is a plane. The mutation part 231 is at a position of the second sealing part 21 away from the central axis of the diaphragm valve head 2, that is, the mutation part 231 is located at the circumferential edge of the diaphragm valve head 2 and is close to the first sealing part 123. When the diaphragm valve head 2 disengages from the valve seat 12, the fluid will pass through the mutation part 231. Under the action of the mutation part 231, a turbulent flow effect will be generated on the fluid passing through the mutation part 231, thereby effectively increasing the scouring force of the fluid on the first sealing part 123, making the particulate matter on the first sealing part 123 more easily washed off, improving the scouring effect of the fluid, and further reducing the number of particulate matters on the first sealing part 123; in addition, the bottom end of the diaphragm valve head 2 adopts a plane, which can effectively reduce the overall length of the diaphragm valve head 2, thereby reducing the stroke required for the diaphragm valve head 2 to completely disengage from the valve seat 12, and also reducing the length of the driving component 3 in the movement direction of the diaphragm valve head 2, enabling the overall valve body to remain compact, and at the same time, it can also accelerate the speed of the diaphragm valve head 2 to be completely opened, making the operation of the valve body more convenient.

[0049] As Figure 5As shown, in this embodiment, the angle between the first sealing portion 123 and the vertical plane is α1, and the angle between the second sealing portion 21 and the vertical plane is α2, where α1 - 10° ≤ α2 ≤ α1 + 10°. It should be noted that since the second sealing portion 21 adopts a convex curved surface structure, the angle between the top end of the second sealing portion 21 and the vertical plane is the smallest, the angle between the bottom end of the second sealing portion 21 and the vertical plane is the largest, and the difference between the angles between the two ends of the second sealing portion 21 and the vertical plane and the angle between the first seal and the vertical plane is not greater than 10°. The angle α1 and the angle α2 are relatively close, that is, the first sealing portion 123 and the second sealing portion 21 are relatively close and easier to fit. When the abutting portion 6 is damaged, only a small stroke of the diaphragm valve head 2 needs to be moved to make the second sealing portion 21 in the first abutting area 4 abut against the first sealing portion 123. Furthermore, when the width of the abutting portion 6 is increased by the same amount, the stroke increment of the diaphragm valve head 2 can be effectively reduced, thereby avoiding situations that are not conducive to sealing, such as excessive driving force applied to the diaphragm valve head 2 resulting in excessive abutting force between the valve seat 12 and the diaphragm valve head and excessive deformation between the valve seat 12 and the diaphragm valve head 2.

[0050] As Figure 3 and Figure 5 As shown, in the present utility model, since the abutting force on the diaphragm valve head 2 needs to be increased after the initial abutting portion 6 is worn to achieve a larger contact area between the diaphragm valve head 2 and the first sealing portion 123, the extrusion force received by the first sealing portion 123 will also increase during actual use. In this embodiment, the angle between the first sealing portion 123 and the horizontal plane is β, where arctan2 > β > arctan0.5, arctan0.5 ≈ 27°, arctan2 ≈ 63°, that is, 63° > β > 27°. Specifically, the first sealing portion 123 adopts a tapered surface structure that is wider at the top and narrower at the bottom. When the second sealing portion 21 abuts against the first sealing portion 123, the valve seat 12 will receive an obliquely downward acting force. When the above angle β is adopted, the component forces of the acting force received by the valve seat 12 in the horizontal and vertical directions are relatively close, avoiding the component force in the horizontal direction exceeding twice the component force in the vertical direction, or the component force in the vertical direction exceeding twice the component force in the horizontal direction. Especially when β = 45°, the component forces of the acting force received by the valve seat 12 in the horizontal and vertical directions are equal.

[0051] For example Figure 3As shown, the valve seat 12 includes a first region 121 and a second region 122. The first flow channel 111 is disposed on the lower side of the first region 121, and the second flow channel 112 is disposed on the outer peripheral side of the second region 122. Therefore, the thickness of the first region 121 in the vertical direction is smaller, and the thickness of the second region 122 in the horizontal direction is smaller. Therefore, by using the included angle β, it is possible to prevent the valve seat 12 from being deformed due to excessive force in the horizontal or vertical direction, making the cooperation between the valve seat 12 and the diaphragm valve head 2 more stable and reliable, and helping to improve the service life of the valve seat 12. When the included angle β ≤ 27°, the component of the force received by the valve seat 12 in the vertical direction will increase, which may cause the first region 121 to be deformed due to excessive force. At the same time, the slope of the first sealing portion 123 is relatively gentle, and the particulate matter is not easily dropped from the first sealing portion 123, which may increase the amount of particulate matter on the first sealing portion 123, resulting in the diaphragm valve head 2 being more easily damaged. When the included angle β ≥ 63°, the component of the force received by the valve seat 12 in the horizontal direction will increase, which may cause the second region 122 to be deformed due to excessive force.

[0052] It should be noted that, of course, the setting of the above β angle is also applicable to other valve seat structures, not limited to Figure 3 the structure shown.

[0053] As Figure 3 and Figure 4 shown, in this embodiment, the diaphragm valve head 2 further has an outward convex portion 22 on the upper side of the valve seat 12, and the minimum radius of the outward convex portion 22 is greater than the maximum radius of the first sealing portion 123. When the valve body is closed, the sediment in the valve cavity liquid will first be blocked by the outward convex portion 22 when falling, and the sediment will adhere to the outward convex portion 22 or bypass the outward convex portion 22 and continue to settle downward. When the sediment adheres to the outward convex portion 22, it can prevent the sediment from falling and adhering to the first sealing portion 123, thereby avoiding wear between the two when the first sealing portion 123 contacts the second sealing portion 21. Similarly, if the sediment bypasses the outward convex portion 22 and continues to settle downward, at this time, the sediment is far from the first sealing portion 123, and it is difficult to adhere to the first sealing portion 123 when settling downward.

[0054] Let the difference between the maximum radius of the outward convex portion 22 and the maximum radius of the first sealing portion 123 be L, and the height difference between the maximum radius of the outward convex portion 22 and the top end of the valve seat 12 be H. It can be understood that when L is a fixed value, the greater H is, the greater the height of the sediment drop is, and the easier the sediment is to float onto the first sealing portion 123. When H is a fixed value, the smaller L is, the easier the sediment is to float onto the first sealing portion 123.

[0055] Further preferably, L / H≥0.4. Adopting this design can further avoid the situation where the height H is too large or the radius difference L is too small, resulting in the sediment still being likely to float onto the first sealing portion 123.

[0056] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Those skilled in the art should understand that the present utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the present utility model will be included in the scope of the claims.

Claims

1. A valve body, comprising: A valve main body with a flow channel provided inside; A valve seat arranged inside the valve main body and separating the flow channel; A diaphragm valve head arranged inside the valve main body and cooperating with the valve seat to control the opening and closing of the flow channel; A driving assembly for controlling the movement of the diaphragm valve head; A first sealing portion is provided on the valve seat, and a second sealing portion is provided on the diaphragm valve head. The first sealing portion and the second sealing portion are in mutual abutment to close the valve seat; Characterized in that: When the valve body is closed, at least part of the second sealing portion extends into the inner side of the first sealing portion, and the first sealing portion and the second sealing portion have an abutting portion in mutual abutment. There is a first area to be abutted above the abutting portion. In the first area to be abutted, the angle between the first sealing portion and the vertical plane at the same height is greater than the angle between the second sealing portion and the vertical plane.

2. The valve body according to claim 1, characterized in that, At least one of the first sealing portion and the second sealing portion is a convex curved surface structure.

3. A valve body according to claim 2, wherein, The first sealing portion is a conical surface structure with a wider upper part and a narrower lower part, and the side surface of the second sealing portion is a convex curved surface structure.

4. A valve body according to claim 2 or 3, characterized in that, There is a second area to be abutted below the abutting portion. In the second area to be abutted, the angle between the first sealing portion and the vertical plane at the same height is less than the angle between the second sealing portion and the vertical plane.

5. A valve body according to claim 4, characterized in that, A mutation portion is provided at a position of the second sealing portion in the second area to be abutted away from the central axis of the diaphragm valve head.

6. A valve body according to claim 5, characterized in that, The bottom end surface of the diaphragm valve head is a plane, and the connection between the side edge of the diaphragm valve head and the bottom end surface constitutes the mutation portion.

7. A valve body according to claim 1, characterized in that, The height difference between the top end of the first sealing portion and the upper side of the abutting portion is less than the height difference between the lower side of the abutting portion and the bottom end of the first sealing portion.

8. A valve body according to claim 1, characterized in that, The diaphragm valve head further has a convex portion above the valve seat. The minimum radius of the convex portion is greater than the maximum radius of the first sealing portion; and when the valve body is closed, the height difference between the maximum radius position of the convex portion and the top end of the valve seat is H, and the difference between the maximum radius of the convex portion and the maximum radius of the first sealing portion is L, where L / H≥0.

4.

9. A valve body according to claim 1, characterized in that, The maximum diameter of the second sealing portion is equal to the maximum diameter of the first sealing portion, and the angle between the first sealing portion and the vertical plane is α1, and the angle between the second sealing portion and the vertical plane is α2, where α1 - 10°≤α2≤α1 + 10°.

10. A valve body according to claim 1, characterized in that, The valve seat and / or the diaphragm valve head is made of resin material, and the angle between the first sealing portion and the horizontal plane is β, and 63°>β>27°.

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