Valve body and butterfly valve

Abstract

The utility model belongs to the technical field of valves, and particularly discloses a valve body and a butterfly valve. The outer wall of the valve body is recessed from outside to inside, the inner wall of the valve body protrudes inwards to form a sealing valve seat, and the thickness of the valve body at the sealing valve seat is uniform. The sealing valve seat is provided with an incident flow face, a transition face and a back flow face, the incident flow face, the transition face and the back flow face are sequentially and smoothly connected in the medium inlet and outlet direction to form a streamline curved face, and the incident flow face and the back flow face are further symmetrically arranged on the two sides of the transition face. The thickness of the valve body at the sealing valve seat is uniform, and casting defects are not prone to being generated.

Description

Technical Field

[0001] This application belongs to the technical field of valves, and more specifically, relates to a valve body and a butterfly valve. Background Art

[0002] A valve is a pipeline accessory commonly used in pipelines to open and close pipelines and regulate and control the flow rate of the transported medium. To meet the design requirements of complex shapes and improve the material utilization rate, the valve body of the valve is usually made by casting process.

[0003] In the related art, to improve the closing stability and sealing performance of the valve, a ring-shaped raised sealing valve seat is usually arranged at the sealing surface of the flow channel in the valve body for the butterfly plate or sealing ring in the valve to abut and seal. For example, a sealing structure of a small-diameter triple eccentric butterfly valve disclosed in the Chinese patent document with the publication number CN217842714U has a convex part integrally formed on the inner wall of the valve body, and the convex surface of the convex part is inclined.

[0004] However, for valve body castings, although setting the sealing valve seat can improve the closing stability and sealing performance of the valve body, due to the existence of the sealing valve seat, the thickness difference of the valve body is relatively large, and the valve body casting is prone to defects such as pores, porosity, and slag inclusions, resulting in poor quality of the valve body casting. Utility Model Content

[0005] Aiming at the defects or improvement requirements of the prior art, this application provides a valve body and a butterfly valve, aiming to solve the problem that valve body castings are prone to casting defects.

[0006] A valve body provided by this application has an outer wall that is recessed from the outside to the inside and an inner wall that bulges inward to form a sealing valve seat, and the thickness of the valve body at the sealing valve seat is uniform.

[0007] Through the above technical solutions conceived by this application, compared with the prior art, since the thickness of the valve body at the sealing valve seat is uniform, it is not easy for casting defects to appear inside the valve body casting. Compared with the traditional valve body casting with uneven thickness, the valve body designed in this way has higher quality and is not prone to casting defects.

[0008] As a further preference, the sealing valve seat has a flow-facing surface, a transition surface, and a flow-back surface, and the flow-facing surface, the transition surface, and the flow-back surface are smoothly connected in sequence along the direction of the medium entering and exiting, forming a streamlined curved surface.

[0009] As a further preference, the flow-facing surface and the flow-back surface are symmetrically arranged on both sides of the transition surface.

[0010] As a further preference, the valve body is an integrally cast part.

[0011] As a further preference, the outer end surface of the journal of the valve body is provided with a positioning structure for suppressing the swing of the transmission device.

[0012] As a further preference, the positioning structure comprises a first groove arranged on the outer end surface of the journal, so as to allow the transmission device to be positioned in the first groove through a positioning member.

[0013] As further preferred, a plurality of first grooves are arranged at intervals on the outer end surface of the neck of the valve body.

[0014] As a further preferred embodiment, the valve body further comprises reinforcing ribs, wherein the reinforcing ribs connect the shaft neck, the valve body main body and the flange of the valve body.

[0015] The second aspect of the present application provides a butterfly valve adopting the following technical solution:

[0016] A butterfly valve comprises a valve body provided in the first aspect.

[0017] As a further preference, the butterfly valve further comprises a transmission device, the mounting surface of the transmission device has a second groove, and the second groove is connected to the shaft neck via a positioning piece to suppress the swing of the transmission device.

[0018] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art:

[0019] 1. Since the thickness of the valve body at the sealing seat is uniform, it is not easy to have casting defects inside the valve body casting. Compared with traditional castings with uneven thickness, the valve body casting under this design has higher quality.

[0020] 2. The streamlined and symmetrical design of the sealing valve seat can effectively reduce the flow resistance coefficient of the valve body and improve the flow capacity of the fluid.

[0021] 3. By setting a first groove at the outer end surface of the shaft neck and a second groove at the mounting surface of the transmission device, when assembling the transmission device, the second groove is connected to the first groove through a positioning piece to suppress the swing of the transmission device, which can improve a series of problems such as valve sealing failure, loose closure and fastener wear and shearing caused by the swing of the transmission device. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a cross-sectional view of a valve body provided in an embodiment of the present application;

[0023] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0024] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0025] 1. Sealing valve seat; 1-1. Flow-facing surface; 1-2. Transition surface; 1-3. Flow-backing surface; 2. Journal; 2-1. First groove; 3. Valve body main body; 4. Flange; 5. Reinforcing rib. Specific embodiments

[0026] In order to make the objectives, technical solutions and advantages of this application clearer, the following further elaborates on this application in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit this application.

[0027] The following further elaborates on this application in conjunction with the attached Figure 1-2 drawings.

[0028] An embodiment of this application discloses a valve body. Referring to Figure 1-2 , the outer wall of the valve body is recessed from the outside to the inside and the inner wall bulges inward to form a sealing valve seat 1, and the thickness of the valve body at the sealing valve seat 1 is uniform.

[0029] Furthermore, as Figure 2 shown, the sealing valve seat 1 of the valve body has a flow-facing surface 1-1, a transition surface 1-2 and a flow-backing surface 1-3. The flow-facing surface 1-1, the transition surface 1-2 and the flow-backing surface 1-3 are smoothly connected in sequence along the medium inlet and outlet direction to form a streamlined curved surface. Further, the flow-facing surface 1-1 and the flow-backing surface 1-3 are symmetrically arranged on both sides of the transition surface 1-2.

[0030] In the traditional design, one side of the bevel-shaped valve seat has a large resistance and the other side has a small resistance. In this design, whether the valve is opened or closed, the resistance received by the valve switch structure (such as a butterfly plate) installed in the valve body in the two directions is the same, reducing the torque. In addition, in this design, since the two sides of the streamlined curved surface of the sealing valve seat 1 have symmetrical shapes, the shapes of the depressions on the inner and outer surfaces of the valve body are also symmetrical, making it easier to cast and process the valve body to form a state with uniform wall thickness.

[0031] Furthermore, the valve body is a one-piece casting. Under this design, since the thickness of the one-piece formed valve body at the sealing valve seat 1 is uniform, it is not easy to have casting defects inside the valve body casting. Compared with the traditional casting with uneven thickness, the quality of the valve body casting in this design is higher.

[0032] It can be understood that the uniform thickness emphasizes minimizing the variation range of the thickness during the design and manufacturing process to ensure the consistency of the valve body in terms of performance and appearance. Specifically, the "uniform thickness" mentioned above means that the thickness of the valve body casting at the sealing valve seat 1 is basically consistent as a whole, and the shapes of the inner and outer surfaces are similar; although it is difficult to make the thickness dimensions exactly the same in actual production, it does not affect the general understanding of this concept by those skilled in the art.

[0033] It is understandable that the valve body can be the valve body of a butterfly valve, check valve, one-way valve or other valves that require a sealing seat (or sealing structures such as sealing surfaces / sealing parts / sealing rings) inside. For example, when using this valve body as a component of a butterfly valve, the valve body mainly includes a valve body main body 3, a journal 2 and a flange 4. Among them, a flow channel is provided inside the valve body main body 3 for the medium to flow through; the journal 2 is connected to the valve body main body 3 for installing a shaft rod; the flange 4 is installed at both ends of the valve body main body 3 for assembling and connecting with the pipeline.

[0034] Furthermore, in some embodiments, when using this valve body as a component and applying it to some valves with a transmission device (such as a butterfly valve), in order to improve the stability of the transmission device, a positioning structure for suppressing the swing of the transmission device is provided on the outer end surface of the journal 2 of the valve body.

[0035] Specifically, the positioning structure includes a first groove 2-1 provided on the outer end surface of the journal 2, and the first groove 2-1 is used for the transmission device to be positioned at the first groove 2-1 through a positioning member. A plurality of first grooves 2-1 are arranged at intervals on the outer end surface of the neck of the valve body, or only one is provided, and this quantity can be adjusted according to actual needs. Preferably, two first grooves 2-1 are symmetrically arranged along the radial direction on the outer end surface of the journal 2.

[0036] In the actual production process, the first groove 2-1 is designed in the mold, so that the valve body blank can come with the first groove 2-1 for assembling the positioning member and does not need to be processed.

[0037] Of course, a plurality of through holes are also provided on the outer end surface of the journal 2 for connecting the journal 2 and the transmission device through bolts or other feasible fasteners, so that the transmission device and the journal 2 are integrated.

[0038] Furthermore, in some other embodiments, the positioning structure can also be structures such as protrusions and through holes. When the positioning structure is a protrusion, correspondingly, a matching groove is provided at the installation surface of the transmission device. At this time, through the insertion and cooperation of the protrusion and the groove, the swing of the transmission device can also be suppressed.

[0039] Furthermore, the valve body further includes a reinforcing rib 5, and the reinforcing rib 5 connects the journal 2, the valve body main body 3 and the flange 4 of the valve body. By providing the reinforcing rib 5, the strength of the valve body can be greatly improved.

[0040] The embodiment of the present application also discloses a butterfly valve, and this butterfly valve includes a valve body as described above.

[0041] Further, in some embodiments, the butterfly valve further includes a transmission device for driving the shaft rod in the valve body. The transmission device can be a worm and gear transmission device, a gear transmission device, or any other feasible device capable of driving the shaft rod in the butterfly valve for active adjustment.

[0042] To improve the installation stability of the transmission device and make it difficult to swing, a second groove is provided at the installation surface of the transmission device. The second groove is connected to the journal 2 through a positioning member to inhibit the swing of the transmission device. Preferably, the second groove is connected to the first groove 2-1 in the journal 2 through a positioning member.

[0043] Among them, the positioning member includes but is not limited to a cylindrical pin. For example, a conical pin, a positioning block, etc. can also be used. When using a cylindrical pin or a conical pin, a flush-mounted installation scheme can be adopted, and correspondingly, the depth of the second groove is set to half of the diameter of the cylindrical pin or the conical pin, and the depth of the first groove 2-1 is set to half of the diameter of the cylindrical pin or the conical pin. When assembling the transmission device, first flush-mount the cylindrical pin into the first groove 2-1 and the second groove, and then perform other assembly work, so as to improve a series of problems such as valve seal failure, incomplete closing, and wear and shear of fasteners caused by the swing of the transmission device.

[0044] It should be understood that expressions such as "including" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit the existence of one or more additional functions, operations, and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or a combination thereof, but cannot be interpreted as excluding the existence or the possibility of adding one or more other characteristics, numbers, operations, constituent elements, components, or a combination thereof.

[0045] It should be understood that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of this application, "a plurality of" means two or more unless otherwise specifically defined.

[0047] In this application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "coupled", "fixed", etc. shall be construed 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 components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of this application and are not intended to limit this application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

1. A valve body, characterized in that, The outer wall of the valve body is recessed from the outside to the inside, and the inner wall bulges inward to form a sealing valve seat (1), and the thickness of the valve body at the sealing valve seat (1) is uniform.

2. The valve body according to claim 1, characterized in that, The sealing valve seat (1) has a flow-facing surface (1-1), a transition surface (1-2) and a flow-back surface (1-3). The flow-facing surface (1-1), the transition surface (1-2) and the flow-back surface (1-3) are smoothly connected in sequence along the direction of medium inlet and outlet to form a streamlined curved surface.

3. The valve body according to claim 2, characterized in that, The flow-facing surface (1-1) and the flow-back surface (1-3) are symmetrically arranged on both sides of the transition surface (1-2).

4. The valve body according to claim 1, wherein, The valve body is an integrally cast part.

5. The valve body according to any one of claims 1-4, characterized in that, A positioning structure for suppressing the swing of the transmission device is provided on the outer end surface of the journal (2) of the valve body.

6. The valve body according to claim 5, characterized in that, The positioning structure includes a first groove (2-1) provided on the outer end surface of the journal (2) for positioning the transmission device at the first groove (2-1) through a positioning member.

7. The valve body according to claim 6, wherein A plurality of the first grooves (2-1) are spaced apart on the outer end surface of the neck of the valve body.

8. The valve body according to any one of claims 1-4, characterized in that, The valve body further includes a reinforcing rib (5), and the reinforcing rib (5) connects the journal (2), the valve body main body (3) and the flange (4) of the valve body.

9. A butterfly valve, characterized in that: A valve body as described in any one of claims 1-8 is included.

10. The butterfly valve according to claim 9, wherein: The butterfly valve further includes a transmission device. The mounting surface of the transmission device has a second groove, and the second groove is connected to the journal (2) through a positioning member to suppress the swing of the transmission device.

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