Single-clip butterfly valve connecting structure and butterfly valve

Abstract

The application relates to the technical field of pipeline valves, in particular to a single-clip butterfly valve connecting structure and a butterfly valve. In the single-clip butterfly valve connecting structure and the butterfly valve provided in the embodiment of the application, a cylindrical bushing is sleeved on the screw rod of the fastening bolt, and a disc spring piece is arranged in the bushing and coaxially connected with the screw rod. Through mutual cooperation of the above structure, the pre-tightening force judgment standard of the fastening bolt is determined: when the disc spring piece is extruded to be in contact with the inner wall of the bushing, the pre-tightening force of each fastening bolt is automatically kept consistent. Through the above structure design, the assembly pre-tightening force of each fastening bolt can be controlled without relying on the experience of workers, so that the sealing performance and stability of the connection between the butterfly valve and the pipeline are remarkably improved.

Description

Technical Field

[0001] This application relates to the field of pipeline valve technology, and more specifically, to a single-clamp butterfly valve connection structure and a butterfly valve. Background Technology

[0002] A butterfly valve is a type of valve that controls the flow of fluid or regulates its flow rate by rotating a disc-shaped butterfly plate. Butterfly valves are characterized by their simple structure, small size, and rapid opening and closing, and are therefore widely used in water supply and drainage, chemical industry, and energy fields.

[0003] In related technologies, commonly used butterfly valves can be divided into wafer-type butterfly valves and flanged butterfly valves. Wafer-type butterfly valves use double-ended bolts to connect the valve between two pipe flanges. Single-jaw butterfly valves are a type of wafer-type butterfly valve, also known as lug-type butterfly valves. The main differences between single-jaw butterfly valves and ordinary wafer-type butterfly valves are twofold: first, single-jaw butterfly valves have threaded connections, while ordinary wafer-type butterfly valves have smooth hole connections; second, single-jaw butterfly valves can be used both in the middle and at the end of a pipeline, serving as end valves, while ordinary wafer-type butterfly valves can only be used in the middle of a pipeline.

[0004] In practical use, because there is a lack of standardized control methods for the preload force between the various fastening bolts of a single-clamp butterfly valve, workers can only rely on memory and experience to determine the number of turns and the torque by feel. This experience-dependent assembly method seriously affects the connection reliability and service life of the single-clamp butterfly valve, thus posing a significant safety hazard. Utility Model Content

[0005] In view of this, the present application provides a single-clamp butterfly valve connection structure and butterfly valve to solve the problem of lack of standardized control means for the preload of fastening bolts in related technologies.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] <First Aspect>

[0008] A single-clamp butterfly valve connection structure includes:

[0009] The connecting surface has multiple bolt holes evenly distributed along the circumferential thickness of its edge.

[0010] Multiple fastening bolts are inserted into the bolt holes, and their ends are fixedly attached to the pipe flange by fastening nuts.

[0011] Multiple bushings are fitted onto the outside of the threaded rod of the fastening bolt, with their bottom surfaces in contact with the connecting surface;

[0012] A disc spring is sleeved outside the screw and located inside the bushing, with its outer diameter smaller than the inner diameter of the bushing; both ends of the disc spring contact the nut head of the fastening bolt and the connecting surface, respectively, and its thickness is smaller than the thickness of the bushing; wherein,

[0013] When the nut head presses against the disc spring, the disc spring expands radially and abuts against the inner wall of the bushing, so that the preload of each of the fastening bolts remains the same.

[0014] In some possible implementations, the outer diameter of the nut head is larger than the outer diameter of the bushing, and its bottom surface abuts against the top surface of the bushing.

[0015] In some possible implementations, the top surface of the bushing is provided with a first wedge-shaped tooth, which abuts against the nut head through the first wedge-shaped tooth.

[0016] In some possible implementations, the screw sleeve is provided with multiple disc springs, with adjacent disc springs stacked alternately in opposite directions.

[0017] In some possible implementations, a gasket is also included, which is disposed between the connecting surface and the fastening nut, and has second wedge-shaped teeth on its two surfaces, which abut against the fastening nut and the connecting surface through the second wedge-shaped teeth.

[0018] <Second aspect>

[0019] A butterfly valve includes a single-clamp butterfly valve connection structure as described in any one of the first aspects above, wherein the single-clamp butterfly valve connection structure is integrally formed with the butterfly valve.

[0020] The single-clamp butterfly valve connection structure and butterfly valve provided in this application embodiment have at least the following characteristics:

[0021] Beneficial effects:

[0022] In the single-clamp butterfly valve connection structure and butterfly valve provided in this application embodiment, a cylindrical bushing is provided around the screw of the fastening bolt, and a disc spring is provided inside the bushing, coaxially connected to the screw. Through the cooperation of the above structures, the preload judgment criterion of the fastening bolt is clarified: when the disc spring is squeezed to contact the inner wall of the bushing, the preload of each fastening bolt is automatically kept consistent. With the above structural design, the assembly preload of each fastening bolt can be controlled without relying on worker experience, thereby significantly improving the sealing and stability of the connection between the butterfly valve and the pipeline. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the connection structure of the single-clamp butterfly valve and the structure of the butterfly valve provided in the embodiments of this application;

[0025] Figure 2 for Figure 1 Side view;

[0026] Figure 3 for Figure 2 Exploded view of the connection structure of a single-clamp butterfly valve;

[0027] Figure 4 for Figure 2 Exploded view of the central fastening bolt, disc spring, bushing, and fastening nut;

[0028] Figure 5 This is an assembly diagram of the bushing and fastening bolts in another embodiment of this application;

[0029] Figure 6 This is an assembly diagram of the gasket and its connection structure with a single-clamp butterfly valve in another embodiment of this application.

[0030] In the picture:

[0031] 100. Connecting surface; 110. Bolt hole;

[0032] 200. Fastening bolt; 210. Threaded rod; 220. Nut head;

[0033] 300. Tighten the nuts;

[0034] 400, Bushing; 410, First wedge tooth;

[0035] 500. Disc reed;

[0036] 600, gasket; 610, second wedge tooth;

[0037] 700. Butterfly valve. Detailed Implementation

[0038] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0039] <Example 1>

[0040] like Figures 1-4 As shown, the single-clamp butterfly valve connection structure provided in this embodiment includes a connecting surface 100, multiple fastening bolts 200, multiple bushings 400, and a disc spring 500. The connecting surface 100 is a structure on the periphery of the butterfly valve 700 used for connection with a pipeline, and is typically integrally formed with the butterfly valve 700. Multiple bolt holes 110 are provided along the thickness direction at the edge of the connecting surface 100, and the bolt holes 110 are equidistantly distributed circumferentially.

[0041] Each bolt hole 110 is fitted with a fastening bolt 200, and each fastening bolt 200 includes a nut head 220 and a threaded rod 210 coaxially fixedly connected to it (the thread of the threaded rod 210 is not shown in the figure, but it is actually present). The end of the threaded rod 210 is connected to a fastening nut 300 by thread. The fastening nut 300 can abut against the other side of the connecting surface 100, and the connecting surface 100 is fixedly attached to the flange surface of the pipe by threaded connection.

[0042] In this embodiment, a bushing 400 is fitted over the screw 210 of the fastening bolt 200. The bushing 400 is a cylindrical structure made of 304 stainless steel, with an annular bottom surface. The bushing 400 is attached to the surface of the connecting surface 100 through this annular bottom surface. Inside the bushing 400, a disc spring 500 is coaxially fitted with the screw 210. The outer diameter of the disc spring 500 is smaller than the inner diameter of the bushing 400, and its thickness is smaller than the thickness of the bushing 400. Both ends of the disc spring 500 are respectively attached to the bottom surface of the nut head 220 of the fastening bolt 200 and the connecting surface 100. Preferably, the outer diameter of the nut head 220 is larger than the outer diameter of the bushing 400, and the nut head 220 abuts against the bottom surface of the bushing 400 through its bottom surface. Multiple disc springs 500 can be used, and adjacent disc springs 500 are stacked alternately in a positive-negative arrangement.

[0043] In practical use, a disc spring 500 and a bushing 400 are respectively fitted over the screw 210 of the fastening bolt 200. Then, the end of the fastening bolt 200 is inserted into the bolt hole 110 of the connecting surface 100, and then the end of the bolt is fixed with a fastening nut 300. As the fastening bolt 200 is gradually tightened, the nut head 220 will compress the disc spring 500 to expand radially until it contacts the inner wall of the bushing 400, thereby ensuring that the preload of each fastening bolt 200 is the same, and this is used as the standard for setting the same preload.

[0044] Finally, repeat the above steps and tighten the remaining fastening bolts 200 in a diagonal manner to ensure that the preload of all fastening bolts 200 is consistent. In this way, the single-clamp butterfly valve can be fixedly installed at the end of the pipeline and used as a terminal valve.

[0045] In the single-clamp butterfly valve connection structure and butterfly valve provided in this application embodiment, a cylindrical bushing 400 is provided outside the screw 210 of the fastening bolt 200, and a disc spring 500 coaxially connected to the screw 210 is provided inside the bushing 400. Through the cooperation of the above structures, the preload judgment criterion of the fastening bolt 200 is clarified: when the disc spring 500 is squeezed to contact the inner wall of the bushing 400, the preload of each fastening bolt 200 automatically remains consistent. With the above structural design, the assembly preload of each fastening bolt 200 can be controlled without relying on worker experience, thereby significantly improving the sealing performance and stability of the single-clamp butterfly valve connection structure.

[0046] In some embodiments, such as Figure 5 As shown, the top surface of the bushing 400 is provided with a first wedge-shaped tooth 410, the tip of which contacts the bottom surface of the nut head 220. The bushing 400 can form a meshing relationship with the bottom surface of the nut head 220 through the first wedge-shaped tooth 410, and prevent the nut head 220 from rotating relative to the bushing 400 as much as possible, thereby solving the problem of the fastening bolt 200 loosening due to vibration.

[0047] In some embodiments, such as Figure 6 As shown, a washer 600 is provided between the fastening nut 300 and the connecting surface 100. Both surfaces of the washer 600 are provided with second wedge-shaped teeth 610, the tips of which contact the fastening nut 300 and the connecting surface 100 respectively. Similarly, the above structural design can form a bidirectional wedge-shaped locking structure, thereby preventing the fastening nut 300 from loosening due to vibration and ensuring that the preload is continuous and does not decrease.

[0048] <Example 2>

[0049] The butterfly valve 700 provided in this application embodiment includes the single-clamp butterfly valve connection structure described in Embodiment 1, and the single-clamp butterfly valve connection structure is integrally formed with the butterfly valve 700.

[0050] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0051] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0052] Generally speaking, terms should be understood at least in part by their use in context. For example, at least in part by context, the term "one or more" as used in the text can be used to describe any feature, structure, or characteristic of the singular meaning, or a combination of features, structures, or characteristics of the plural meaning. Similarly, at least in part by context, terms such as "a" or "the" can also be understood to convey either singular or plural usage.

[0053] It should be readily understood that the terms “on,” “above,” and “on top of” in this disclosure should be interpreted in the broadest possible sense, such that “on” means not only “directly on something” but also “on something” with an intermediate feature or layer therebetween, and that “above” or “on top of” means not only “on top of something” but also “on top of something” without an intermediate feature or layer therebetween (i.e., directly on something).

[0054] Furthermore, for ease of explanation, spatially relative terms such as "below," "below," "under," "above," and "above" may be used to describe the relationship of one element or feature relative to other elements or features as shown in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation other than those shown in the figures. The device may have other orientations (rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein may be interpreted accordingly.

[0055] As used herein, the term "substrate" refers to the material on which subsequent material layers are added. The substrate itself may be patterned. The material added on top of the substrate may be patterned or may remain unpatterned. Furthermore, the substrate may include a wide range of materials, such as silicon, germanium, gallium arsenide, indium phosphide, etc. Alternatively, the substrate may be made of a non-conductive material (e.g., glass, plastic, or sapphire wafers).

[0056] The term "layer" as used herein can refer to a portion of material comprising a region of thickness. A layer may extend over the entire underlying or overlying structure, or may have a extent smaller than that of the underlying or overlying structure. Furthermore, a layer may be a region of a homogeneous or non-homogeneous continuous structure, with a thickness less than that of the continuous structure. For example, a layer may be located between the top and bottom surfaces of the continuous structure, or between any pairs of lateral planes at the top and bottom surfaces. A layer may extend laterally, vertically, and / or along a tapered surface. A substrate may be a layer, and may include one or more layers, and / or may have one or more layers located on, above, and / or below it. A layer may include multiple layers. For example, an interconnect layer may include one or more conductor and contact layers (forming contacts, interconnects, and / or vias therein) and one or more dielectric layers.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A connection structure for a single-clamp butterfly valve, characterized in that, include: The connecting surface has multiple bolt holes evenly distributed along the circumferential thickness of its edge. Multiple fastening bolts are inserted into the bolt holes, and their ends are fixedly attached to the pipe flange by fastening nuts. Multiple bushings are fitted onto the outside of the threaded rod of the fastening bolt, with their bottom surfaces in contact with the connecting surface; A disc spring is sleeved outside the screw and located inside the bushing, with its outer diameter smaller than the inner diameter of the bushing; both ends of the disc spring contact the nut head of the fastening bolt and the connecting surface, respectively, and its thickness is smaller than the thickness of the bushing; wherein, When the nut head presses against the disc spring, the disc spring expands radially and abuts against the inner wall of the bushing, so that the preload of each of the fastening bolts remains the same.

2. The single-clamp butterfly valve connection structure according to claim 1, characterized in that: The outer diameter of the nut head is larger than the outer diameter of the bushing, and its bottom surface abuts against the top surface of the bushing.

3. The single-clamp butterfly valve connection structure according to claim 2, characterized in that: The top surface of the bushing is provided with a first wedge-shaped tooth, which abuts against the nut head through the first wedge-shaped tooth.

4. The single-clamp butterfly valve connection structure according to claim 1, characterized in that: The screw sleeve is provided with multiple disc springs, and adjacent disc springs are stacked alternately in opposite directions.

5. The single-clamp butterfly valve connection structure according to claim 1, characterized in that: It also includes a gasket, which is disposed between the connecting surface and the fastening nut, and has a second wedge-shaped tooth on each of its two surfaces, which abuts against the fastening nut and the connecting surface through the second wedge-shaped tooth.

6. A butterfly valve, characterized in that, The single-clamp butterfly valve connection structure includes any one of claims 1-5, wherein the single-clamp connection structure and the butterfly valve are integrally formed.

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