Butterfly valve
By combining the tilted design of the butterfly plate with the annular elastic compensation sealing ring, the problem of easy deformation or tearing of the existing butterfly valve sealing ring under high pressure is solved, achieving better sealing performance and durability.
Patent Information
- Application Number
- CN202520580516.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2035-03-31
AI Technical Summary
The sealing rings of existing butterfly valves are prone to deformation or tearing under high pressure, resulting in poor sealing performance and potential leakage after long-term use.
The valve adopts an inclined butterfly plate design, with the midpoint of the butterfly plate axis coinciding with the midpoint of the valve stem axis. The angle between the butterfly plate axis and the valve stem axis is an acute angle. Combined with the annular elastic compensation sealing ring, which consists of a metal O-ring and a rubber-coated ring, and the metal O-ring is filled with inert gas, it works in conjunction with the valve seat with an inclined positive cone hole to achieve uniform contact and sealing.
It improves sealing performance, effectively prevents media leakage, reduces the decline in sealing performance of rubber-coated rings caused by impurity adhesion, extends the service life of sealing rings, and reduces maintenance costs.
Smart Images
Figure CN223754654U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to butterfly valve technical field, especially butterfly valve. BACKGROUND
[0002] The butterfly valve is also called flap valve, and the butterfly valve is widely applied, and gas, water, corrosive medium and liquid metal can be controlled by the butterfly valve, due to the advantages of small volume, light weight, small flow resistance, rapid opening and closing and the like, the butterfly valve is universally used in working conditions of various trades.
[0003] The butterfly valve is composed of a valve body, a valve rod, a butterfly plate and a sealing ring, the butterfly plate is driven to rotate by rotating the valve rod, the butterfly plate can cover the internal section of the valve body, so as to play a role of cutting off the pipeline medium; similarly, the butterfly plate no longer covers the internal section of the valve body by rotating the butterfly plate, so that the circulation of the pipeline medium can be realized. The sealing ring of the existing butterfly valve has a T-shaped section, and the material is rubber, which is easily deformed or torn under high pressure, and leakage may occur during long-term use, so that the sealing performance of the valve is poor. SUMMARY
[0004] The utility model aims at providing a butterfly valve to solve the problems in the prior art, improve the sealing performance, and improve the durability.
[0005] To achieve the above object, the utility model provides the following scheme:
[0006] The utility model provides a butterfly valve, including valve body, valve rod and butterfly plate, the valve body has the through -flow channel along its axial direction, one end of the valve rod passes through the valve body and extends into the through -flow channel, and the valve rod can rotate around the axis, the butterfly plate is located in the through -flow channel and is fixedly connected with the valve rod in the through -flow channel, the axis midpoint of the butterfly plate coincides with the axis midpoint of the valve rod, and is located on the axis of the through -flow channel, the angle between the axis of the butterfly plate and the axis of the valve rod is acute, the circumferential side wall of the butterfly plate is provided with annular elastic compensation sealing ring, the elastic compensation sealing ring includes metal O -ring and rubber coated ring wrapped in the metal O -ring outside, the metal O -ring is filled with inert gas, the position of the elastic compensation sealing ring of the butterfly plate in the through -flow channel is fixedly provided with valve seat, the valve seat has the oblique positive taper hole, the axis of the oblique positive taper hole is coaxial with the axis of the butterfly plate, and the inner side wall of the oblique positive taper hole faces the axis of the valve rod.
[0007] Preferably, the inner side wall of the oblique positive taper hole is provided with a cladding sealing surface corresponding to the position of the elastic compensation sealing ring.
[0008] Preferably, the butterfly plate comprises a butterfly plate base body and a butterfly plate cover; the butterfly plate cover is detachably fixed on the butterfly plate base body; a circumferential side wall of the butterfly plate base body is provided with a first groove, a circumferential side wall of the butterfly plate cover is provided with a second groove, and the first groove and the second groove jointly form a complete annular accommodating groove for placing the elastic compensation sealing ring.
[0009] Preferably, the butterfly plate cover is provided with at least one first positioning hole and a plurality of first connecting holes, and the butterfly plate base body is provided with a plurality of second connecting holes and at least one second positioning hole; the first positioning hole corresponds to the second positioning hole one by one, and the first positioning hole and the second positioning hole are connected by a positioning pin; the first connecting hole corresponds to the second connecting hole one by one, and the first positioning hole and the second positioning hole are fixedly connected by a connecting piece.
[0010] Preferably, along the axis direction of the flow passage, the opening edges of the two ends of the obliquely arranged right conical hole are both provided with rounded corners.
[0011] Preferably, the butterfly plate base body comprises a butterfly plate corresponding body and a butterfly plate side body, the butterfly plate corresponding body is fixedly arranged on one side of the butterfly plate side body, and the butterfly plate corresponding body is arranged opposite to the butterfly plate cover; the structure of the butterfly plate cover close to the butterfly plate corresponding body is the same as that of the butterfly plate side body; a first annular half-groove is arranged on the circumferential side wall of the butterfly plate side body, a second half-annular half-groove is arranged on the side wall of the butterfly plate corresponding body, and a third half-annular half-groove is arranged on the side wall of the butterfly plate cover; the second half-annular half-groove and the third half-annular half-groove jointly form a second annular half-groove; and the second annular half-groove and the first annular half-groove jointly form the accommodating groove.
[0012] Preferably, at least one process screw hole for assembly and lifting is arranged on the butterfly plate base body and the butterfly plate cover.
[0013] Preferably, the first connecting hole is a light hole, the second connecting hole is a threaded blind hole, and the connecting piece is a fastening screw.
[0014] Preferably, at least one protrusion is fixedly arranged on the butterfly plate base body and the butterfly plate cover, and the process screw hole for assembly and lifting is arranged on the protrusion.
[0015] Preferably, the valve body is provided with a through hole and a mounting hole, the through hole is opposite to the mounting hole in position, and the flow passage is between the through hole and the mounting hole; the valve rod is sealingly and rotatably arranged in the through hole, one end of the valve rod is rotatably arranged in the mounting hole, and the other end of the valve rod is located outside the valve body and is in transmission connection with a driving mechanism, and the driving mechanism can drive the valve rod to rotate around the axis of the valve rod.
[0016] The butterfly valve provided by the utility model has the following technical effects relative to the prior art:
[0017] The butterfly valve provided by the utility model has the following technical effects relative to the prior art: The butterfly valve is characterized in that the butterfly plate is obliquely arranged in the flow passage, the midpoint of the butterfly plate axis coincides with the midpoint of the valve rod axis, and the included angle between the butterfly plate axis and the valve rod axis is an acute angle. The unique oblique design changes the movement track of the butterfly plate during opening and closing, so that the contact and separation between the butterfly plate and the valve seat are more stable. During closing, the butterfly plate can gradually approach the valve seat in a relatively more uniform manner, and the elastic compensation sealing ring can also more uniformly contact and compress the obliquely arranged right-angle taper hole, thereby improving the sealing performance. The elastic compensation sealing ring is composed of a metal O-shaped ring filled with inert gas inside and an outer rubber covering ring. The gas pressure in the metal O-shaped ring is set according to the working pressure of the valve, which can provide the rubber covering ring with continuous and self-adaptive compensation elastic force, so that the rubber covering ring is more tightly attached to the obliquely arranged right-angle taper hole of the valve seat, and the possible tiny gap is filled, thereby effectively preventing medium leakage and greatly improving the sealing performance. The compensation elastic force provided by the metal O-shaped ring for the rubber covering ring can reduce the problem of sealing performance reduction caused by the adhesion of particles and impurities contained in the medium on the rubber covering ring. During closing, the rubber covering ring will gradually compress and seal the inclined sealing surface based on the oblique sealing surface setting of the obliquely arranged right-angle taper hole. This process can also form a scraping effect on the inclined sealing surface of the obliquely arranged right-angle taper hole, that is, the adhered impurities on the inclined sealing surface can be scraped off to a certain extent. BRIEF DESCRIPTION OF DRAWINGS
[0018] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without any creative effort.
[0019] Figure 1 The utility model provides the whole structure schematic diagram of butterfly valve;
[0020] Figure 2 The utility model provides the cross section structure schematic diagram of butterfly valve;
[0021] Figure 3 The utility model provides the structure schematic diagram of butterfly plate in butterfly valve; Figure 2 The local enlarged view of A in the middle;
[0022] Figure 4 The utility model provides the structure schematic diagram of butterfly plate in butterfly valve;
[0023] Figure 5The utility model provides a structure schematic drawing of butterfly plate base body in butterfly valve.
[0024] Figure 6 The utility model provides a structure schematic drawing of butterfly plate base body in butterfly valve.
[0025] Figure 7 The utility model provides a structure schematic drawing of butterfly plate base body in butterfly valve.
[0026] Figure 8 The utility model provides a structure schematic drawing of butterfly plate base body in butterfly valve.
[0027] In the drawing,
[0028] 10-valve body;11-tilt positive taper hole;12-welding sealing surface;13-round corner setting;14-assembly hoisting process screw hole;15-perforation;16-mounting hole;
[0029] 20-valve rod;
[0030] 30-butterfly plate;31-butterfly plate corresponding body;32-butterfly plate side body;321-second positioning hole;322-second connecting hole;33-butterfly plate cover;331-first positioning hole;332-first connecting hole;34-accommodation recess;341-first half complete recess;342-third half annular recess;35-fastening screw;
[0031] 40-elastic compensation sealing ring;41-metal O ring;42-rubber covered ring;
[0032] 50-driving mechanism. DETAILED DESCRIPTION
[0033] The technical scheme in the embodiments of the utility model will be described clearly and completely below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0034] The utility model aims at providing a kind of butterfly valve, to solve the problems existing in prior art, improve sealing performance, and improve durability.
[0035] To make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the utility model is further described in detail below in conjunction with the drawings and specific embodiments.
[0036] Embodiment one
[0037] The embodiment provides a butterfly valve, which is mainly used for drainage of systems such as waterworks, power stations, steel smelting, chemical industry, water source engineering, environmental facility construction, and especially water pipeline, and is used as adjusting and isolating equipment. Figures 1-8 As shown in the figure, the butterfly valve comprises a valve body 10, a valve rod 20 and a butterfly plate 30; the valve body 10 has a flow channel penetrating through the valve body 10 along the axial direction; one end of the valve rod 20 penetrates through the valve body 10 and extends into the flow channel, and the valve rod 20 can rotate around the axis of the valve rod 20; the butterfly plate 30 is obliquely arranged in the flow channel, and the butterfly plate 30 is fixedly connected with the valve rod 20 in the flow channel; the midpoint of the axis of the butterfly plate 30 coincides with the midpoint of the axis of the valve rod 20, and both are located on the axis of the flow channel, and the angle between the axis of the butterfly plate 30 and the axis of the valve rod 20 is an acute angle (for example, 15°); the circumferential side wall of the butterfly plate 30 is provided with an annular elastic compensation sealing ring 40, the elastic compensation sealing ring 40 comprises a metal O-shaped ring 41 and a rubber covering ring 42 wrapped outside the metal O-shaped ring 41, and the metal O-shaped ring 41 is filled with inert gas; the position corresponding to the elastic compensation sealing ring 40 of the butterfly plate 30 in the flow channel is fixedly provided with a valve seat, and the valve seat has an obliquely arranged positive taper hole 11, the axis of the obliquely arranged positive taper hole 11 is coaxial with the axis of the butterfly plate 30, and the inner side wall of the obliquely arranged positive taper hole 11 faces the axis of the valve rod 20.
[0038] By obliquely arranging the butterfly plate 30 in the flow channel, and by making the midpoint of the axis of the butterfly plate 30 coincide with the midpoint of the axis of the valve rod 20 and making the angle between the axis of the butterfly plate 30 and the axis of the valve rod 20 an acute angle, the unique oblique design changes the movement track of the butterfly plate 30 during opening and closing, so that the contact and separation between the butterfly plate 30 and the valve seat are more stable, and in the closing process, the butterfly plate 30 can gradually approach the valve seat in a relatively more uniform manner, and the elastic compensation sealing ring 40 can also more uniformly contact and compress the obliquely arranged positive taper hole 11, so that the sealing performance is improved; the elastic compensation sealing ring 40 is composed of the metal O-shaped ring 41 filled with inert gas inside and the rubber covering ring 42 outside, the gas pressure in the metal O-shaped ring 41 is set according to the working pressure of the valve, which can provide the rubber covering ring 42 with continuous and self-adaptive compensation elastic force, so that the rubber covering ring 42 is more closely attached to the obliquely arranged positive taper hole 11 of the valve seat, and the possible small gap is filled, so that the medium leakage is effectively prevented, the sealing performance is greatly improved, and the compensation elastic force provided by the metal O-shaped ring 41 for the rubber covering ring 42 can reduce the problem of sealing performance reduction caused by the particles and impurities contained in the medium adhering to the rubber covering ring 42; in the closing process, based on the oblique sealing surface setting of the obliquely arranged positive taper hole 11, the rubber covering ring 42 will gradually compress and seal the oblique sealing surface during the closing process, and this process can also form a scraping effect on the oblique sealing surface of the obliquely arranged positive taper hole 11, that is, the adhered impurities on the oblique sealing surface can be scraped off to a certain extent.
[0039] Among them, the related setting of the valve body 10 is as follows:
[0040] In an optional solution of the embodiment, preferably, as shown in Figure 2 , Figure 3 and Figure 8 , the inner side wall of the obliquely arranged positive taper hole 11 is provided with a surfacing sealing surface 12 at a position corresponding to the elastic compensation sealing ring. The surfacing sealing surface 12 has good wear resistance, corrosion resistance and sealing performance, and cooperates with the elastic compensation sealing ring 40 to provide a tighter seal and reduce the possibility of medium leakage. The design of the obliquely arranged positive taper hole 11 enables the sealing surface to better fit the elastic compensation sealing ring 40 when they are in contact, thereby improving the sealing effect, especially in high-pressure and large-diameter working conditions, which can effectively prevent medium leakage. When the sealing surface is damaged, the surfacing sealing surface 12 can be repaired or resurfaced without the need to replace the entire valve body 10 or other large components, thereby reducing maintenance costs and difficulty.
[0041] In an optional solution of the embodiment, preferably, as shown in Figure 3 , the opening edges of the two ends of the obliquely arranged positive taper hole 11 are both chamfered 13 along the axis direction of the flow passage. When the butterfly valve is closed, the elastic compensation sealing ring 40 cooperates with the obliquely arranged positive taper hole 11 to achieve sealing. The chamfered design can avoid the sharp edges of the two ends of the positive taper hole causing scratches or wear to the elastic compensation sealing ring 40, thereby prolonging the service life of the sealing ring and ensuring the stability of the sealing performance. The chamfered design can make the fluid pass through the butterfly valve more smoothly, reduce the turbulence and vortex phenomenon of the fluid at the orifice, reduce the fluid resistance, improve the flow efficiency of the valve, and reduce energy loss.
[0042] Specifically, the elastic compensation sealing ring 40 is distributed around the valve stem 20 along the center line of the butterfly plate 30, the butterfly plate 30 and the valve stem 20 form an angle of 15°, and the sealing surface of the obliquely arranged positive taper hole 11 on the valve seat is an obliquely arranged conical surface. No matter the butterfly plate 30 is subjected to the pressure of the medium in the forward direction or in the reverse direction, the butterfly plate 30 can be pressed tightly on the sealing surface to achieve bidirectional sealing based on the cooperation of the elastic compensation sealing ring 40.
[0043] Among them, the related setting of the valve stem 20 is as follows:
[0044] In an optional solution of the embodiment, preferably, as shown in Figure 2As shown, the valve body 10 is provided with a through hole 15 and a mounting hole 16, the through hole 15 is opposite to the mounting hole 16, and a flow passage is formed between the through hole 15 and the mounting hole 16; the valve stem 20 is sealingly and rotatably arranged in the through hole 15, one end of the valve stem 20 is rotatably arranged in the mounting hole 16, and the other end of the valve stem 20 is located outside the valve body 10 and is in transmission connection with the driving mechanism 50, and the driving mechanism 50 can drive the valve stem 20 to rotate around the axis of the valve stem 20. The one end of the valve stem 20 is rotatably arranged in the mounting hole 16, and the other end is in transmission connection with the driving mechanism 50 after passing through the through hole 15. This structure design provides stable support for the valve stem 20, so that the valve stem 20 can rotate flexibly and stably around its axis.
[0045] Specifically, the driving mechanism 50 is a device for controlling the opening and closing of the butterfly valve, which is a prior structure and can adopt common manual (hand wheel), electric, pneumatic and hydraulic types.
[0046] Specifically, the structure in which the valve stem 20 is sealingly and rotatably arranged on the valve body 10 is a prior structure, and will not be described in detail here.
[0047] Among them, the related setting of the butterfly plate 30 is as follows:
[0048] In the optional scheme of the present embodiment, more preferably, as shown in Figures 4-7 As shown, the butterfly plate 30 includes a butterfly plate 30 base body and a butterfly plate cover 33; the butterfly plate cover 33 is detachably fixedly arranged on the butterfly plate 30 base body; the circumferential side wall of the butterfly plate 30 base body is provided with a first groove, and the circumferential side wall of the butterfly plate cover 33 is provided with a second groove, and the first groove and the second groove jointly form a complete annular accommodating groove 34 for placing the elastic compensation sealing ring 40. The butterfly plate 30 is designed to be composed of the butterfly plate 30 base body and the detachable butterfly plate cover 33. When the elastic compensation sealing ring 40 is installed, the sealing ring can be first placed in the first groove of the butterfly plate 30 base body, and then the butterfly plate cover 33 is fixed on the butterfly plate 30 base body, so that the second groove and the first groove form a complete accommodating groove 34 to accommodate the sealing ring. This way is more convenient than installing the sealing ring on the integral butterfly plate 30. Moreover, when the sealing ring needs to be replaced due to wear or damage, the old sealing ring can be easily taken out and a new sealing ring can be installed by detaching the butterfly plate cover 33, without the need to detach the entire butterfly valve from the pipeline or disassemble the butterfly valve on a large scale, thereby greatly reducing the maintenance cost and workload. The accommodating groove 34 formed by the first groove and the second groove provides a precise installation position for the elastic compensation sealing ring 40, which can ensure that the sealing ring maintains a uniform compression state after installation, thereby better adhering to the valve seat and improving the sealing performance of the butterfly valve.
[0049] In the optional scheme of the present embodiment, more preferably, as shown in Figures 4-6As shown, the base body of the butterfly plate 30 includes a butterfly plate counterpart 31 and a butterfly plate side body 32, the butterfly plate counterpart 31 is fixedly arranged on one side of the butterfly plate side body 32, and the butterfly plate counterpart 31 is arranged opposite to a butterfly plate cover 33, and the structure of the butterfly plate cover 33 close to the butterfly plate counterpart 31 is the same as that of the butterfly plate side body 32; a first annular half-groove is arranged on the circumferential side wall of the butterfly plate side body 32, a second half-annular half-groove is arranged on the side wall of the butterfly plate counterpart 31, and a third half-annular half-groove 342 is arranged on the side wall of the butterfly plate cover 33; the second half-annular half-groove and the third half-annular half-groove 342 jointly form a second annular half-groove; and the second annular half-groove and the first annular half-groove jointly form a containing groove 34 by being spliced together. The butterfly plate counterpart 31 and the butterfly plate side body 32 are integrally formed, and the whole formed by the butterfly plate counterpart 31 and the butterfly plate cover 33 is left-right symmetrical with the butterfly plate side body 32 after being rotated by 180° around itself.
[0050] Specifically, one half of the first annular half-groove on the butterfly plate side body 32 and the second half-annular half-groove on the butterfly plate counterpart 31 form a first half-complete groove 341, and the other half of the first annular half-groove on the butterfly plate side body 32 and the third half-annular half-groove 342 on the butterfly plate cover 33 form a second half-complete groove, and the first half-complete groove 341 and the second half-complete groove jointly form the containing groove 34.
[0051] In an optional solution of the embodiment, preferably, as shown in the drawings, Figures 4-7 As shown, the butterfly plate cover 33 is provided with at least one first positioning hole 331 and a plurality of first connecting holes 332, and the base body of the butterfly plate 30 is provided with a plurality of second connecting holes 322 and at least one second positioning hole 321; the first positioning hole 331 and the second positioning hole 321 correspond one by one, and the first positioning hole 331 and the second positioning hole 321 are connected by a positioning pin; the first connecting hole 332 and the second connecting hole 322 correspond one by one, and the first positioning hole 331 and the second positioning hole 321 are fixedly connected by a connecting piece. The positioning pin cooperates with the corresponding first positioning hole 331 and second positioning hole 321 to ensure the relative position accuracy of the butterfly plate cover 33 and the base body of the butterfly plate 30 during assembly, so that each component of the butterfly valve is installed at the correct position; the positioning pin can play a guiding role during assembly, facilitating the quick alignment and installation of the butterfly plate cover 33 and the base body of the butterfly plate 30; the plurality of first connecting holes 332 and second connecting holes 322 are fixedly connected by the connecting piece, which can make the connection between the butterfly plate cover 33 and the base body of the butterfly plate 30 more firm and reliable, the uniformly distributed connecting holes can disperse the connecting force, avoid excessive local stress, improve the stability and strength of the overall structure of the butterfly valve, enable it to withstand greater pressure and impact force, and be suitable for various different working environments and working conditions.
[0052] In an optional solution of the embodiment, preferably, as shown in the drawings, Figure 1As shown, the first connecting hole 332 is a light hole, the second connecting hole 322 is a threaded blind hole, and the connecting piece is a fastening screw 35. The presence of the light hole enables the fastening screw 35 to be quickly inserted, plays a role in preliminary positioning, facilitates alignment with the threaded blind hole, and when installing, only the fastening screw 35 needs to be inserted through the light hole and then screwed into the threaded blind hole to complete the connection, without the need to process threads on the butterfly plate cover 33, reducing processing procedures and improving installation efficiency.
[0053] Among them, the other related settings are as follows:
[0054] In the optional solution of the embodiment, preferably, as shown in the figure, Figure 4 As shown, at least one process screw hole 14 for assembly and lifting is arranged on the base body of the butterfly plate 30 and the butterfly plate cover 33. In the production, assembly, installation and maintenance process of the butterfly valve, the butterfly plate 30 needs to be lifted and transported, and the presence of the process screw hole enables the lifting ring or other lifting tools to be connected through bolts, and then the lifting machine or other equipment is used for lifting, so that the butterfly plate 30 can be conveniently and quickly moved from one position to another position, avoiding the damage that may be caused by directly binding the butterfly plate 30 with a rope, and improving the safety and stability of the lifting process.
[0055] In the optional solution of the embodiment, preferably, as shown in the figure, Figure 4 As shown, at least one protrusion is fixedly arranged on the base body of the butterfly plate 30 and the butterfly plate cover 33, and a process screw hole 14 for assembly and lifting is arranged on the protrusion. The protrusion can increase the local thickness and strength of the base body of the butterfly plate 30 and the butterfly plate cover 33 at the lifting point, avoiding the deformation or damage of the surface of the butterfly plate 30 due to the action of concentrated force during lifting; the protrusion provides a more definite positioning and connecting point for the lifting tool, so that the lifting operation is more accurate and convenient, and the workers can more easily align and connect the lifting ring or other lifting tools with the process screw hole on the protrusion, improving the efficiency and safety of lifting.
[0056] The principle and implementation mode of the specific examples are described in the utility model, and the above embodiment is only used to help understand the method and core idea of the utility model; meanwhile, for the general technical personnel in the field, according to the idea of the utility model, the specific implementation mode and application range will be changed. In conclusion, the content of the specification should not be understood as the limitation of the utility model.
Claims
1. A butterfly valve, characterized by: The valve body, the valve stem and the butterfly plate are included. The valve body has a flow passage axially through it; One end of the valve stem extends into the flow passage through the valve body, and the valve stem can rotate around its axis; The butterfly plate is obliquely located in the flow passage, and the butterfly plate is fixedly connected with the valve stem in the flow passage; the midpoint of the axis of the butterfly plate coincides with the midpoint of the axis of the valve stem, and both are located on the axis of the flow passage; the angle between the axis of the butterfly plate and the axis of the valve stem is an acute angle; The circumferential side wall of the butterfly plate is provided with an annular elastic compensation sealing ring, the elastic compensation sealing ring includes a metal O-shaped ring and a rubber covering ring wrapped outside the metal O-shaped ring, and the metal O-shaped ring is filled with inert gas; a valve seat is fixedly arranged in the flow passage corresponding to the position of the elastic compensation sealing ring of the butterfly plate, and the valve seat has an obliquely arranged positive taper hole, the axis of the obliquely arranged positive taper hole is coaxial with the axis of the butterfly plate, and the inner side wall of the obliquely arranged positive taper hole faces the axis of the valve stem.
2. The butterfly valve of claim 1, wherein: The inner side wall of the obliquely arranged positive taper hole is provided with a surfacing sealing surface corresponding to the position of the elastic compensation sealing ring.
3. The butterfly valve of claim 1, wherein: The butterfly plate includes a butterfly plate base body and a butterfly plate cover; the butterfly plate cover is detachably fixedly arranged on the butterfly plate base body; The circumferential side wall of the butterfly plate base body is provided with a first groove, the circumferential side wall of the butterfly plate cover is provided with a second groove, and the first groove and the second groove jointly form a circumferentially complete accommodating groove, and the accommodating groove is used for placing the elastic compensation sealing ring.
4. The butterfly valve of claim 3, wherein: At least one first positioning hole and a plurality of first connecting holes are arranged on the butterfly plate cover, and a plurality of second connecting holes and at least one second positioning hole are arranged on the butterfly plate base body; The first positioning hole and the second positioning hole correspond to each other one by one, and the first positioning hole and the second positioning hole are connected through a positioning pin; the first connecting hole and the second connecting hole correspond to each other one by one, and the first positioning hole and the second positioning hole are fixedly connected through a connecting piece.
5. The butterfly valve of claim 1, wherein: In the axial direction of the flow passage, the two end opening edges of the obliquely arranged positive taper hole are both provided with rounded corners.
6. The butterfly valve of claim 3, wherein: The butterfly plate base body includes a butterfly plate corresponding body and a butterfly plate side body, the butterfly plate corresponding body is fixedly arranged on one side of the butterfly plate side body, and the butterfly plate corresponding body is arranged opposite to the butterfly plate cover; the structure of the butterfly plate cover and the butterfly plate side body close to the butterfly plate corresponding body is the same; A first annular half-groove is arranged on the circumferential side wall of the butterfly plate side body, a second half-annular half-groove is arranged on the side wall of the butterfly plate corresponding body, and a third half-annular half-groove is arranged on the side wall of the butterfly plate cover; The second half-annular half-groove and the third half-annular half-groove jointly form a second annular half-groove; and the second annular half-groove and the first annular half-groove jointly form the accommodating groove.
7. The butterfly valve of claim 3, wherein: At least one process screw hole for assembly and lifting is arranged on the butterfly plate base body and the butterfly plate cover.
8. The butterfly valve of claim 4, wherein: The first connecting hole is a light hole, the second connecting hole is a threaded blind hole, and the connecting piece is a fastening screw.
9. The butterfly valve of claim 7, wherein: At least one protrusion is fixedly arranged on the butterfly plate base body and the butterfly plate cover, and the protrusion is provided with the process screw hole for assembly and lifting.
10. The butterfly valve of claim 1, wherein: The valve body is provided with a through hole and a mounting hole, the through hole is opposite to the mounting hole, and the flow channel is between the through hole and the mounting hole; the valve rod is sealingly and rotatably arranged in the through hole, one end of the valve rod is rotatably arranged in the mounting hole, and the other end of the valve rod is located outside the valve body and is in transmission connection with a driving mechanism, and the driving mechanism can drive the valve rod to rotate around the axis of the valve rod.