Novel high-performance butterfly valve

Abstract

The invention discloses a butterfly valve, which comprises a valve body, a valve core, a valve core and a valve core, an upper through hole and a lower through hole which are coaxial are formed in the valve body; the two ends of the valve rod penetrate through the upper through hole and the lower through hole in the valve body respectively, and the valve rod is arranged in the fluid channel; the butterfly plate is arranged on the valve rod in a sleeving manner and rotates around the valve rod to form an access state or a cut-off state; the sealing ring is arranged on the end face of the valve body, and the inner ring of the sealing ring protrudes out of the inner side face of the valve body; the pressing plate is arranged on one side of the end face, provided with the sealing ring, of the valve body, is pressed on the end face of the valve body and is used for fixing the sealing ring; the sealing assemblies are respectively arranged in the upper through hole and the lower through hole; the Haver ring is embedded in the lower end of the valve rod and located in the sealing assembly of the lower through hole. The invention has the advantages of simple structure, good sealing performance and long service life, and is suitable for working conditions of highly corrosive media such as chemicals.

Description

Technical Field

[0001] This invention relates to the field of valves, and in particular to a novel high-performance butterfly valve. Background Technology

[0002] With the development of many industries, high-performance butterfly valves are frequently and importantly used in working conditions involving flammable, explosive, and highly corrosive substances such as chemicals and petroleum products. Especially in situations involving corrosive chemicals or acidic / alkaline pipeline media, it is necessary to optimize the butterfly valve structure to ensure performance and extend service life, thereby enhancing product market competitiveness.

[0003] The statements herein provide only background information in relation to this invention and do not necessarily constitute prior art. Summary of the Invention

[0004] The purpose of this invention is to provide a new type of high-performance butterfly valve, which has the advantages of simple structure, suitability for strong corrosive media such as chemicals, good sealing performance, and long service life.

[0005] To achieve the above objectives, the present invention provides a butterfly valve, comprising: a valve body having a fluid passage therein; two coaxial upper through holes and a lower through hole on the valve body; a valve stem having both ends passing through the upper through hole and the lower through hole on the valve body respectively, and disposed within the fluid passage; a butterfly plate sleeved on the valve stem and rotating around the valve stem to form a passable state or a cut-off state; a sealing ring disposed on the end face of the valve body, with the inner ring of the sealing ring protruding from the inner side of the valve body; a pressure plate disposed on one side of the end face of the valve body where the sealing ring is disposed, and pressing against the end face of the valve body for fixing the sealing ring; sealing components disposed within the upper through hole and the lower through hole respectively; and a Haver ring embedded at the lower end of the valve stem and located within the sealing component of the lower through hole.

[0006] In one embodiment, the sealing assembly located within the upper through hole is a first sealing assembly. The first sealing assembly includes a packing washer, a first packing seat, a Y-ring, and a packing pressure ring arranged sequentially in a direction away from the center of the valve body. The packing washer is placed inside the valve body, and the first packing seat is positioned axially above the packing washer. The radially inner and outer sides of the first packing seat contact the valve stem and the valve body respectively to form a clearance fit. The Y-ring is positioned axially above the first packing seat, and the packing pressure ring is positioned axially above the Y-ring. The Y-ring is axially interference-fitted with the first packing seat and the packing pressure ring, and radially interference-fitted with the valve stem and the valve body.

[0007] In one embodiment, the sealing assembly located within the lower through hole is a second sealing assembly. The second sealing assembly includes a second packing seat and a lower end cap arranged sequentially in a direction away from the center of the valve body. The second packing seat is placed within the valve body, and the radially inner and outer sides of the second packing seat respectively contact the valve stem and the valve body to form a clearance fit. The lower end cap is placed axially below the second packing seat, and the upper top surface of the lower end cap is provided with an axial groove. A third O-ring is provided in the axial groove, and the third O-ring is interference-fitted with the valve body and the lower end cap.

[0008] In one embodiment, radial grooves are respectively provided on the inner and outer surfaces of the first packing seat and the second packing seat. The radial grooves on the inner surface are inner circular grooves, and the radial grooves on the outer surface are outer circular grooves. A plurality of the inner circular grooves and the outer circular grooves are alternately distributed along the axial direction of the first packing seat and the second packing seat. A first O-ring and a second O-ring are respectively provided in each inner circular groove and the outer circular groove. The first O-ring is interference-fitted with the valve stem, and the second O-ring is interference-fitted with the valve body.

[0009] In one embodiment, the Haver ring is disposed between the valve stem and the lower end cap; the bottom end of the valve stem is provided with a valve stem groove, a first part of the Haver ring is located in the valve stem groove, and a second part is located between the lower end cap and the second packing seat.

[0010] In one embodiment, a first bearing sleeve and a second bearing sleeve are respectively provided between the valve stem and the upper through hole and the lower through hole; the first bearing sleeve is located axially below the packing washer; and the second bearing sleeve is located axially above the second packing seat.

[0011] In one embodiment, the inner ring of the sealing ring has a hollow portion, and an elastic element is provided in the hollow portion. The elastic element is used to provide elastic force so that the inner ring keeps in contact with the butterfly plate.

[0012] In one embodiment, the elastic element is a metal coil spring or fluororubber.

[0013] In one embodiment, two lugs are symmetrically provided on the outer side of the valve body, and the lugs are provided with connecting holes for butterfly valve installation.

[0014] In one embodiment, the valve stem has a flat key at its top end, the bottom end of which is embedded in a keyway at the top end of the valve stem, and the top end of which is connected to a rotating mechanism for transmitting torque.

[0015] Compared with the prior art, the novel high-performance butterfly valve provided by the present invention has at least the following beneficial effects: (1) It has a simple and reliable structure and is easy to install; the sealing ring is easy to maintain, and can be adjusted or replaced simply by removing the pressure plate; (2) By using polymer materials to manufacture the sealing ring, the corrosion resistance of the butterfly valve is enhanced, making it suitable for various strong acid and alkali corrosive media conditions; (3) By providing a Haver ring, the valve stem ejection function is increased, effectively preventing the valve stem ejection under special circumstances; (4) By setting a bearing sleeve between the valve stem and the through hole of the valve body, the rotational friction and axial wear are reduced, extending the life of the rotating parts; (5) The sealing ring has the advantage of long life, and the double eccentric structure and the butterfly plate sealing surface are provided with large rounded corners, reducing the contact time between the butterfly plate and the sealing ring when opening and closing, thereby reducing the wear of the sealing ring; (6) By setting an elastic element in the hollow part of the inner ring of the sealing ring, the butterfly plate squeezes the inner ring to form an interference fit, and the elastic element is squeezed to provide elastic force, so that the butterfly plate and the sealing ring are in close contact, improving the effective sealing of the butterfly valve. Attached Figure Description

[0016] Figure 1 This is a front view of the butterfly valve of the present invention; Figure 2 This is a side sectional view of the butterfly valve of the present invention; Figure 3 This is a partially enlarged view of the sealing ring of the butterfly valve of the present invention; Figure 4 This is a partially enlarged view of the first sealing assembly of the butterfly valve of the present invention; Figure 5 This is a partially enlarged view of the second sealing assembly of the butterfly valve of the present invention; Figure 6 This is a schematic diagram of the three-position structure of the butterfly valve of the present invention. Detailed Implementation

[0017] The novel high-performance butterfly valve proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, used only to facilitate and clearly illustrate the embodiments of this invention. Please refer to the drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.

[0018] This invention provides a novel high-performance butterfly valve, such as... Figures 1-6 As shown, it includes: a valve body 10, which has a fluid passage 11 inside; the valve body 10 has two coaxial upper through holes 12 and lower through holes 13, which penetrate the inner and outer sides of the valve body 10; a valve stem 20, whose two ends respectively penetrate the upper through holes 12 and lower through holes 13 on the valve body 10, and is disposed in the fluid passage 11; a butterfly plate 30, which is sleeved on the valve stem 20 and can rotate around the valve stem 20 to form a passable state or a cut-off state; and a seal. A sealing ring 40 is disposed on the end face of the valve body 10, with the inner ring 41 of the sealing ring 40 protruding from the inner side of the valve body 10. A pressure plate 50 is disposed on one side of the end face of the valve body 10 where the sealing ring 40 is located and is pressed against the end face of the valve body 10 to fix the sealing ring 40. Sealing components 61 and 62 are respectively disposed in the upper through hole 12 and the lower through hole 13. A Haver ring 70 is embedded in the lower end of the valve stem 20 and located in the sealing component 62 of the lower through hole 13. By rotating the butterfly plate 30, the butterfly plate 30 may partially contact or not contact the inner ring 41 of the sealing ring 40 to form a passage, while the butterfly plate 30 may fully contact (i.e., tightly fit) the inner ring 41 of the sealing ring 40 to form a cut-off. The novel high-performance butterfly valve provided by this invention has a simple and reliable structure, is easy to install, and the sealing ring 40 is easy to maintain; it can be adjusted or replaced simply by removing the pressure plate 50.

[0019] Among them, such as Figure 4 As shown, the sealing assembly 61 located within the upper through hole 12 is the first sealing assembly. The first sealing assembly includes a packing washer 611, a first packing seat 612, a Y-ring 613, and a packing pressure ring 614 arranged sequentially in a direction away from the center of the valve body. The packing washer 611 is placed inside the valve body 10, and the first packing seat 612 is positioned axially above the packing washer 611. The radial inner and outer sides of the first packing seat 612 contact the valve stem 20 and the valve body 10 respectively to form a clearance fit. The Y-ring 613 is positioned axially above the first packing seat 612, and the packing pressure ring 614 is positioned axially above the Y-ring 613. The axial direction of the Y-ring 613 is interference-fitted with the first packing seat 612 and the packing pressure ring 614, and the radial direction is interference-fitted with the valve stem 20 and the valve body 10, thereby achieving the sealing of the upper through hole 12.

[0020] Furthermore, such as Figure 4As shown, the first packing seat 612 is a ring with a certain radial thickness and axial length. Radial grooves are respectively provided on the inner and outer surfaces of the first packing seat 612. The radial groove on the inner surface is an inner circular groove 616, and the radial groove on the outer surface is an outer circular groove 615. Several inner circular grooves 616 and outer circular grooves 615 are alternately distributed along the axial direction of the first packing seat 612. A first O-ring 6121 and a second O-ring 6122 are respectively provided in each inner circular groove 616 and the outer circular groove 615. The first O-ring 6121 is interference-fitted with the valve stem 20, and the second O-ring 6122 is interference-fitted with the valve body 10.

[0021] Among them, such as Figure 5 As shown, the sealing assembly 62 located within the lower through hole 13 is a second sealing assembly. The second sealing assembly includes a second packing seat 621 and a lower end cap 622 arranged sequentially along a direction away from the center of the valve body. The second packing seat 621 is placed inside the valve body 10, and the radial inner and outer sides of the second packing seat 621 respectively contact the valve stem 20 and the valve body 10 to form a clearance fit. The lower end cap 622 is placed axially below the second packing seat 621. The upper top surface of the lower end cap 622 is provided with an axial groove 6221. A third O-ring 6222 is provided in the axial groove 6221. The third O-ring 6222 is press-fitted with the valve body 10 and the lower end cap 622 to achieve sealing of the lower through hole 13.

[0022] Furthermore, such as Figure 5 As shown, the second packing seat 621 is also a ring with a certain radial thickness and axial length. Radial grooves are provided on the inner and outer surfaces of the second packing seat 621. The radial groove on the inner surface is an inner circular groove 626, and the radial groove on the outer surface is an outer circular groove 625. Several inner circular grooves 626 and outer circular grooves 625 are alternately distributed along the axial direction of the second packing seat 621. A first O-ring 6212 and a second O-ring 6211 are respectively provided in each inner circular groove 626 and outer circular groove 625. The first O-ring 6212 is interference-fitted with the valve stem 20, and the second O-ring 6211 is interference-fitted with the valve body 10. This invention improves the sealing performance of the butterfly valve by providing corresponding sealing components in the upper through hole 12 and the lower through hole 13, making it suitable for use with highly corrosive media such as chemicals.

[0023] Among them, such as Figure 2 and Figure 5As shown, the Haver ring 70 is disposed between the valve stem 20 and the lower end cover 622; the bottom end of the valve stem 20 is provided with a valve stem groove 22, the first part of the Haver ring 70 is located in the valve stem groove 22, and the second part of the Haver ring 70 is located between the lower end cover 22 and the second packing seat 621, and contacts the valve body 10, effectively preventing the valve stem 20 from being ejected under special circumstances, thus enhancing the safety of the butterfly valve.

[0024] Furthermore, a first bearing sleeve 14 and a second bearing sleeve 15 are respectively provided between the valve stem 20 and the upper through hole 12 and the lower through hole 13; the first bearing sleeve 14 is located axially below the packing washer 611; the second bearing sleeve 15 is located axially above the second packing seat 621, so that the valve stem 20 drives the butterfly plate 30 to rotate smoothly, reducing rotational friction and axial wear.

[0025] To improve the sealing performance of butterfly valves, such as Figure 3 As shown, the inner ring 41 of the sealing ring 40 has a hollow portion 42, which has a receiving space. An elastic element 421 is provided within the hollow portion 42, providing elastic force to keep the inner ring 41 in contact with the butterfly plate 30. When the butterfly valve is in the off-state, the butterfly plate 30 compresses the inner ring 41 of the sealing ring 40 to form an interference fit. The elastic element 421 is compressed and provides elastic force, keeping the butterfly plate 30 in tight contact with the sealing ring 40, thereby achieving a seal on the butterfly valve. In some embodiments, the elastic element 421 is a metal ring spring or fluororubber, and the sealing ring 40 is made of polytetrafluoroethylene or rubber. The metal ring spring acts as an elastic energy-enhancing device for the sealing ring 40; its elasticity increases with increasing medium pressure within its normal operating range, thereby achieving a positive feedback seal.

[0026] To reduce wear on the sealing ring, the sealing surface of the butterfly plate 30 is rounded to reduce the contact time between the butterfly plate 30 and the sealing ring 40 during opening and closing, thereby reducing wear on the sealing ring 40. However, after the butterfly valve has been operating normally for a period of time, the inner ring 41 of the sealing ring 40 will inevitably experience some wear, and the restraining ability of the inner ring of the sealing ring 40 on the elastic element 421 will decrease. At this time, the elastic element 421 can release its stored energy, causing the inner ring 41 of the sealing ring 40 to deform towards the butterfly plate 30, thereby ensuring the self-adjustment of the sealing ring 40 after slight wear to maintain sealing strength and form a self-compensating seal.

[0027] In this embodiment, as Figure 1As shown, the valve body 10 has two symmetrical lugs 16 on its outer side, each lug 16 having a connecting hole for butterfly valve installation. Specifically, during installation, bolts are passed through the connecting holes on the two lugs 16 and the hole on the pipe flange, and then tightened with nuts to install the butterfly valve. Simultaneously, the symmetrical lugs 16 help to quickly and accurately align the centerline of the butterfly valve with the centerline of the pipe during installation, preventing the butterfly valve from tilting and from deforming or shifting under pressure. The valve stem 20 has a flat key 21 at its top end, the bottom end of which is embedded in the keyway at the top end of the valve stem 20 (not shown in the figure). The top end of the flat key 21 connects to the keyway on the rotating mechanism (not shown in the figure). The rotating mechanism provides the rotational force to drive the butterfly plate 30 to rotate, and the flat key 21 is used to transmit torque.

[0028] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0029] In the description of this invention, it should be understood that the terms "center," "height," "thickness," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0030] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] Although the present invention has been described in detail through the preferred embodiments above, it should be understood that the above description should not be considered as a limitation of the present invention. Various modifications and substitutions to the present invention will be apparent to those skilled in the art after reading the above description. Therefore, the scope of protection of the present invention should be defined by the appended claims.

Claims

1. A butterfly valve, characterized in that, include: The valve body has a fluid passage inside; the valve body has two coaxial upper through holes and lower through holes; A valve stem, with its two ends passing through the upper through hole and the lower through hole on the valve body respectively, is disposed within the fluid passage; A butterfly plate, which is sleeved on the valve stem and rotates around the valve stem to form a pass or a cut-off state; A sealing ring is disposed on the end face of the valve body, and the inner ring of the sealing ring protrudes from the inner side of the valve body; A pressure plate is disposed on one side of the end face of the valve body on which the sealing ring is provided, and is pressed against the end face of the valve body to fix the sealing ring; A sealing assembly is respectively disposed in the upper through hole and the lower through hole; A Haver ring is embedded in the lower end of the valve stem and located within the sealing assembly of the lower through hole.

2. The butterfly valve as described in claim 1, characterized in that, The sealing assembly located within the upper through hole is a first sealing assembly. The first sealing assembly includes a packing washer, a first packing seat, a Y-ring, and a packing pressure ring arranged sequentially in a direction away from the center of the valve body. The packing washer is placed inside the valve body, and the first packing seat is positioned axially above the packing washer. The radially inner and outer sides of the first packing seat contact the valve stem and the valve body respectively to form a clearance fit. The Y-ring is positioned axially above the first packing seat, and the packing pressure ring is positioned axially above the Y-ring. The Y-ring is axially interference-fitted with the first packing seat and the packing pressure ring, and radially interference-fitted with the valve stem and the valve body.

3. The butterfly valve as described in claim 2, characterized in that, The sealing assembly located in the lower through hole is a second sealing assembly. The second sealing assembly includes a second packing seat and a lower end cap arranged sequentially in a direction away from the center of the valve body. The second packing seat is placed in the valve body, and the radial inner side and outer side of the second packing seat respectively contact the valve stem and the valve body to form a clearance fit. The lower end cap is placed axially below the second packing seat. The upper top surface of the lower end cap is provided with an axial groove. A third O-ring is provided in the axial groove. The third O-ring is interference-fitted with the valve body and the lower end cap.

4. The butterfly valve as described in claim 2 or 3, characterized in that, The inner and outer surfaces of the first and second packing seats are respectively provided with radial grooves, wherein the radial grooves on the inner surface are inner circular grooves and the radial grooves on the outer surface are outer circular grooves. A plurality of the inner circular grooves and the outer circular grooves are alternately distributed along the axial direction of the first and second packing seats. Each inner circular groove and the outer circular groove is respectively provided with a first O-ring and a second O-ring. The first O-ring is interference-fitted with the valve stem and the second O-ring is interference-fitted with the valve body.

5. The butterfly valve as described in claim 3, characterized in that, The Haver ring is disposed between the valve stem and the lower end cap; the bottom end of the valve stem is provided with a valve stem groove, the first part of the Haver ring is located in the valve stem groove, and the second part is located between the lower end cap and the second packing seat.

6. The butterfly valve as described in claim 3, characterized in that, A first bearing sleeve and a second bearing sleeve are respectively provided between the valve stem and the upper through hole and the lower through hole; the first bearing sleeve is located axially below the packing washer; the second bearing sleeve is located axially above the second packing seat.

7. The butterfly valve as described in claim 1, characterized in that, The inner ring of the sealing ring has a hollow portion, and an elastic element is provided inside the hollow portion. The elastic element is used to provide elastic force so that the inner ring keeps in contact with the butterfly plate.

8. The butterfly valve as described in claim 7, characterized in that, The elastic element is a metal coil spring or fluororubber.

9. The butterfly valve as described in claim 1, characterized in that, The valve body has two symmetrical lugs on its outer side, and the lugs have connecting holes for butterfly valve installation.

10. The butterfly valve as described in claim 1, characterized in that, The valve stem has a flat key at its top end, the bottom end of which is embedded in the keyway at the top end of the valve stem, and the top end of which is connected to the rotating mechanism for transmitting torque.

Images