Ultra-high temperature double-layer hard sealing butterfly valve

Abstract

The present application relates to a kind of ultra-high temperature double-layer hard seal butterfly valve, including valve body assembly, including inner valve body, outer valve body, butterfly plate, valve stem, butterfly plate is rotationally arranged in inner valve body, valve stem one end is fixed with butterfly plate, valve stem other end passes through outer valve body and is rotationally connected with outer valve body, inner valve body includes deformation part, and two fixed parts fixedly arranged in the axial direction both sides of deformation part, butterfly plate and deformation part abut, the thickness of deformation part is less than the thickness of fixed part;Outer valve body inside is equipped with annular mounting cavity, inner valve body is located in mounting cavity, and two fixed parts are respectively fixed with the two axial wall surfaces of mounting cavity, and inner valve body is spaced apart from the bottom surface of mounting cavity;Rebound component, including multiple supports, multiple rivets, rivet fixed support and outer valve body, support and the outside of fixed part abut;By the cooperation of valve body assembly and rebound component, deformation part is deformed towards mounting cavity direction by heat, solve the problem that butterfly valve is locked under ultra-high temperature working condition.

Description

Technical Field

[0001] This invention belongs to the field of butterfly valve technology, specifically relating to an ultra-high temperature double-layer hard-seal butterfly valve. Background Technology

[0002] Ultra-high temperature double-layer hard-seal butterfly valves are indispensable key control equipment in ultra-high temperature conditions such as blast furnace gas systems in metallurgical industries, gas turbine exhaust pipelines, and high-temperature flue gas treatment. With the development of industrial plants towards higher temperatures and larger scales, extremely stringent requirements are placed on the sealing reliability, opening and closing flexibility, and long-term operational stability of butterfly valves in ultra-high temperature environments above 650℃ and even 800℃. Their performance directly affects the operational safety and energy efficiency of the entire process system.

[0003] Currently, most butterfly valves used in ultra-high temperature applications employ a triple-eccentric all-metal hard-seal structure, achieving theoretically zero-friction opening and closing through the instantaneous separation of the butterfly plate and valve seat during sealing. However, this operating method reveals fundamental flaws in ultra-high temperature environments above 650℃: due to the inherent difference in the thermal expansion coefficients of the valve body and sealing pair, the radial expansion of the stainless steel sealing ring at high temperatures is significantly greater than that of the valve body. Constrained by the rigid structure of the valve body, the sealing ring cannot expand outwards, and its expansion is forced to be released into the valve, thus exerting an inward squeezing effect on the butterfly plate sealing ring. This squeezing effect causes the sealing pair to form an additional "overlapping" interference fit at high temperatures, resulting in a sharp increase in opening and closing torque, or even completely jamming the butterfly plate, making the valve unable to open at high temperatures.

[0004] The aforementioned seizure failures caused by thermal expansion seriously threaten the safe and continuous operation of the process unit, and the traditional triple-eccentric structure can hardly overcome this inherent defect in principle. Therefore, there is an urgent need to develop a new type of ultra-high temperature butterfly valve structure that can actively adapt to thermal expansion displacement and eliminate the "overlapping and sealing" effect, in order to meet the urgent requirements of reliable valve opening and closing and long-term zero leakage in extreme high-temperature industrial scenarios. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the defect in the prior art that the valve body is squeezed inward by thermal expansion under ultra-high temperature conditions, which makes the valve unable to open at high temperature, thereby providing an ultra-high temperature double-layer hard seal butterfly valve.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: An ultra-high temperature double-layer hard-seal butterfly valve, comprising: A valve body assembly includes an inner valve body, an outer valve body, a butterfly plate, and a valve stem. The butterfly plate is rotatably disposed within the inner valve body. One end of the valve stem is fixed to the butterfly plate, and the other end of the valve stem passes through the outer valve body and is rotatably connected to it. The inner valve body includes a deformable portion and two fixed portions fixedly disposed on both axial sides of the deformable portion. The butterfly plate abuts against the deformable portion. The thickness of the deformable portion is less than the thickness of the fixed portions, and the hardness of the deformable portion is less than the hardness of the fixed portions. An annular mounting cavity is provided on the inner side of the outer valve body. The inner valve body is located within the mounting cavity, and the two fixed portions are respectively fixed to two axial walls of the mounting cavity. The inner valve body is spaced apart from the bottom surface of the mounting cavity. The spring-loaded assembly is disposed within the mounting cavity and includes multiple brackets and multiple rivets. The rivets fix the brackets and the outer valve body, and the brackets abut against the outer surfaces of the fixing part and the deforming part.

[0007] Preferably, the diameter of each fixing part gradually decreases along the direction away from the deformable part, so that the deformable part deforms towards the mounting cavity when heated; The coefficient of thermal expansion of the deformable part is greater than that of the fixed part.

[0008] Preferably, the bracket includes mounting portions at both ends of the bracket, the upper side of the mounting portion is provided with a protrusion, and the lower side of the mounting portion contacts the radially outer surface of the inner valve body.

[0009] Preferably, the bracket further includes a spring-loaded portion and a connecting portion, wherein the mounting portion and the connecting portion are both arranged at an angle to the spring-loaded portion; The connecting part is provided with a threaded hole, and the connecting part is fixedly connected to one end of the rivet through the threaded hole. The other end of the rivet abuts against the outer side of the outer valve body in the radial direction.

[0010] Preferably, the rebound assembly further includes a spring, one end of which is fixedly connected to the protrusion, and the protrusion is correspondingly arranged with respect to the spring; The brackets are arranged correspondingly to the rivets, and the brackets are spaced apart. When the deformable part reaches the set deformation, the side of each mounting part facing the other mounting part abuts against it.

[0011] Preferably, the outer valve body is provided with a plurality of hooks on its radial inner wall surface, and the hooks are provided corresponding to the spring; The other end of the spring is provided with a collar, and the other end of the spring is detachably connected to the hook through the collar.

[0012] Preferably, the surface of the mounting portion facing the inner valve body is arc-shaped, and the radius of the arc is equal to the radius of the radially outer surface of the inner valve body so that the radially outer surface of the inner valve body contacts the surface of the mounting portion.

[0013] Preferably, when the butterfly valve is not subjected to high-temperature heating, the spring is in a stretched state; The protrusion is located radially outside the deformed portion.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: The ultra-high temperature double-layer hard-seal butterfly valve provided in the above technical solution effectively solves the problem of seizing under ultra-high temperature conditions through the coordinated cooperation of the valve body assembly and the rebound assembly. When the medium temperature rises, the inner valve body and the butterfly plate in the valve body assembly undergo thermal expansion simultaneously. Since the thickness of the deformable part of the inner valve body is smaller than that of the fixed part and its hardness is lower than that of the fixed part, under the compression of the fixed part on both sides due to thermal deformation, the deformable part will be forced to undergo directional "bulging" deformation into the mounting cavity of the outer valve body. This deformation mechanism actively adapts to and absorbs the thermal expansion displacement, significantly increases the fitting clearance between the deformable part and the butterfly plate, eliminates the tendency of the inner valve body to squeeze the butterfly plate inward due to thermal expansion in traditional structures, and ensures the opening and closing flexibility of the valve stem driving the butterfly plate under ultra-high temperature conditions. The spring-loaded assembly, located within the mounting cavity, secures the bracket to the outer valve body using rivets. The bracket abuts tightly against the outer surface of the fixing part. This structure not only provides stable radial support for the fixing part, but the elastic deformation capability of the bracket also provides pre-tightening assistance and deformation guidance for the bulging action of the deformable part towards the mounting cavity, preventing unexpected unstable deformation of the inner valve body during repeated thermal cycles. Through this dual-action mechanism of the valve body assembly and the spring-loaded assembly, this invention perfectly achieves active compensation and adaptive adjustment of the sealing pair clearance under ultra-high temperature conditions, improving the safety and reliability of valve operation under ultra-high temperature conditions. Attached Figure Description

[0015] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the overall assembly structure of the ultra-high temperature double-layer hard seal butterfly valve provided by the present invention; Figure 2 A cross-sectional view of the inner valve body provided by the present invention; Figure 3 This is a schematic diagram of the structure of the outer valve body provided by the present invention; Figure 4A schematic diagram of the assembly of the springback assembly and the inner valve body provided by the present invention; Figure 5 This is a schematic diagram of the structure of the bracket provided by the present invention.

[0016] Explanation of reference numerals in the attached figures: 1. Valve body assembly; 11. Inner valve body; 111. Deformation part; 112. Fixing part; 12. Outer valve body; 121. Mounting cavity; 122. Hook; 13. Butterfly plate; 14. Valve stem; 2. Spring-loaded assembly; 21. Bracket; 211. Mounting part; 2111. Protrusion; 212. Spring-loaded part; 213. Connecting part; 2131. Threaded hole; 22. Rivet; 23. Spring; 231. Collar. Detailed Implementation

[0017] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] like Figures 1 to 5 As shown, the present invention provides an ultra-high temperature double-layer hard-seal butterfly valve, the overall structure of which includes a valve body assembly 1 and a spring-loaded assembly 2.

[0021] like Figure 1 and Figure 2As shown, the valve body assembly 1 includes an inner valve body 11, an outer valve body 12, a butterfly plate 13, and a valve stem 14. The outer valve body 12 serves as the pressure-bearing outer shell of the entire valve and the basic component for connecting the pipe flange. An annular mounting cavity 121 is formed on its inner surface. This mounting cavity 121 extends axially along the outer valve body 12 and has two opposing axial wall surfaces and a radial bottom surface. The inner valve body 11 is entirely housed within this mounting cavity 121. A certain gap is maintained between the outer surface of the inner valve body 11 and the bottom surface of the mounting cavity 121; that is, they are not fitted together, but rather form a spatial gap that allows the inner valve body 11 to deform radially outward when heated. This gap is one of the key structural features for achieving the core function of this invention.

[0022] The inner valve body 11 includes a deformable portion 111 located at the axial center, and two fixed portions 112 fixedly disposed on both sides of the deformable portion 111 along its axial direction. A butterfly plate 13 is rotatably disposed inside the inner valve body 11, and the outer sealing surface of the butterfly plate 13 directly abuts against the inner surface of the deformable portion 111, forming the main sealing pair. The lower end of the valve stem 14 is fixedly connected to the butterfly plate 13, typically using a tapered pin or key connection to ensure reliable torque transmission; the upper end of the valve stem 14 passes radially outward through the outer valve body 12 and is rotatably connected to the outer valve body 12 via a bushing or bearing, so that an external actuator can drive the butterfly plate 13 to rotate, thereby opening and closing the valve.

[0023] The wall thickness of the deformable portion 111 is significantly less than that of the fixed portion 112, making the deformable portion 111 a relatively weak link in the inner valve body 11, and more prone to radial deflection under axial compression. In terms of material properties, the hardness of the deformable portion 111 is less than that of the fixed portion 112, and the coefficient of thermal expansion of the deformable portion 111 is greater than that of the fixed portion 112. As an example of reasonable material selection in a specific implementation, the fixed portion 112 can be made of chromium-molybdenum steel or precipitation-hardening stainless steel, which have excellent high-temperature strength and relatively low coefficients of thermal expansion, to ensure the overall structural stability of the inner valve body 11 and the reliability of its connection with the outer valve body 12; while the deformable portion 111 can be made of nickel-based alloys with higher coefficients of thermal expansion and good high-temperature oxidation resistance, or austenitic stainless steel, to achieve a greater radial expansion displacement at high temperatures. Through this combination of wall thickness and material thermal property differences, the deformable portion 111 can undergo outward, controllable "bulging" deformation when subjected to high temperatures. The two fixing parts 112 of the inner valve body 11 are fixedly connected to the two axial walls of the mounting cavity 121, respectively. The connection can be achieved by welding or bolting, ensuring that the axial position of the inner valve body 11 within the outer valve body 12 is firmly defined. This boundary condition of being fixed at both ends ensures that the axial expansion stress generated by the fixing parts 112 after heating can only be released to the weaker deformation part 111 in the middle, thereby forcing the deformation part 111 to deform radially towards the mounting cavity 121. Figure 2and Figure 4 It can be seen that the wall thickness of the deformable part 111 is less than that of the fixed part 112. More importantly, the inner wall diameter of the deformable part 111 is greater than that of the fixed part 112. This makes the inner cavity of the inner valve body 11 form a stepped structure that extends radially outward at the junction of the deformable part and the fixed part, so the deformable part 111 is more prone to deformation.

[0024] From a mechanical perspective, when the fixed part 112 expands axially due to heat and compresses the deformable part 111, the center of gravity of its cross-section shifts outward relative to the fixed part because the inner diameter of the deformable part 111 is larger. This asymmetrical cross-section, when subjected to compressive instability, will inevitably bend and deform in the direction of the weaker part of the structure. Since there is a cavity (spaced out) between the outer side of the deformable part 111 and the bottom surface of the mounting cavity 121, it provides space for radial outward deformation; however, inward deformation is geometrically hindered by its large-diameter inner wall and will result in extremely large compressive strain. Therefore, the diameter difference between the deformable part 111 and the fixed part 112 determines that its instability direction must be radially outward.

[0025] To further prevent the deformation part 111 from deforming inward, the spring 23 is provided in the spring rebound assembly 2 of this application. Its connection relationship and working state are as follows: one end of the spring 23 is fixedly set on the protrusion 2111 of the bracket 21 (since the bracket 21 is in close contact with the outer surface of the deformation part 111 of the inner valve body 11, the tension of the spring 23 is actually directly applied to the outer wall surface of the deformation part 111), and the other end is fixed on the hook 122 of the outer valve body 12.

[0026] When the valve is heated, the axial pressure gradually increases but has not yet reached the initial stage of instability. This ever-present outward pulling force acts as the initial bias force, forcing the deformable part 111 to displace radially outward. Once the displacement is initiated, the deformable part bends and becomes unstable along the outward path, completely eliminating the possibility of reverse bulging deformation.

[0027] In summary, this application ensures that the deformable part 111 will undergo radial outward "bulging" deformation in the direction of the bottom surface of the mounting cavity 121 when it is thermally unstable through the dual mechanism of geometric guidance formed by the difference in diameter of the inner wall surface and force guidance formed by the pre-tension of the spring.

[0028] like Figure 2As shown, looking away from the deformation portion 111, i.e., from the axial center of the inner valve body 11 towards both ends, the diameter of each fixing portion 112 gradually decreases. The outer surface of the fixing portion 112 forms a slight taper. This structural design allows the fixing portion 112 to exert an oblique, radially outward compressive force on the deformation portion 111 when it expands axially due to heat, further causing the deformation portion 111 to "bulge" radially outward towards the mounting cavity 121. The diameter of the inner surface of the deformation portion 111 then increases accordingly, actively increasing the fit clearance between it and the outer edge of the butterfly plate 13, fundamentally eliminating the problem of inward compression and increased interference fit of the sealing pair caused by thermal expansion in traditional structures.

[0029] The spring-loaded assembly 2 is also disposed inside the mounting cavity 121 of the outer valve body 12. Its main function is to support the inner valve body 11, provide preload force for the bulge of the deformable part 111, and prevent the inner valve body 11 from undergoing unexpected unstable deformation during repeated thermal cycling. The spring-loaded assembly 2 includes multiple brackets 21, multiple rivets 22, and preferably a spring 23.

[0030] The bracket 21 is the core support element of the rebound assembly 2, and multiple brackets 21 are distributed circumferentially along the inner valve body 11. Each bracket 21 is fixed to the outer valve body 12 by a rivet 22. One end of the rivet 22 presses the bracket 21 tightly, and the other end abuts or is riveted to the radially outer surface of the outer valve body 12, thereby firmly anchoring the bracket 21 in the mounting cavity 121. The main body of the bracket 21 abuts tightly against the radially outer surface of the fixing part 112, so that the inner valve body 11 is elastically constrained in the radial direction by the bracket 21.

[0031] like Figure 4 and Figure 5As shown, each bracket 21 includes mounting portions 211 at both axial ends, a spring-loaded portion 212 in the middle, and a connecting portion 213 connecting the mounting portions 211 and the spring-loaded portion 212. Both the mounting portions 211 and the connecting portion 213 are set at a certain angle to the spring-loaded portion 212, which allows the spring-loaded portion 212 to undergo elastic bending deformation when the bracket 21 is subjected to radial force, thus providing a certain degree of flexible buffering for the radial displacement of the entire inner valve body 11. The lower side of the mounting portion 211, i.e., the side facing the inner valve body 11, is designed as an arc-shaped surface, the radius of which is equal to the radius of the outer side of the inner valve body 11 along the radial direction. This equal-radius arc-shaped surface contact design ensures good surface contact between the mounting portion 211 and the outer side of the fixing portion 112 of the inner valve body 11, resulting in a more uniform distribution of supporting force and avoiding localized stress concentration in the inner valve body 11. A threaded hole 2131 is provided on the connecting part 213, and one end of the rivet 22 is provided with an external thread. The threaded hole 2131 is used to achieve a threaded fixed connection with the connecting part 213, thereby locking the position of the entire bracket 21.

[0032] The connecting part 213 is fixed to the outer valve body by the rivet 22, and the mounting part 211 is in contact with the inner valve body 11, that is, the mounting part 211 abuts against the inner valve body 11. In other words, the bracket 21 is fixed to the outer valve body 12 and abuts against the inner valve body 11.

[0033] Under high temperature, the deformable part 111 expands radially outward, and the deformable part 111 will squeeze part of the mounting part 211, thereby causing the spring-loaded part 212 to deform, so that the two mounting parts 211 of the same bracket 21 expand to both sides in the circumferential direction, that is, the mounting parts 211 of the two adjacent brackets 21 will approach each other. When the deformable part 111 reaches the set maximum deformation, the mounting parts 211 of the two adjacent brackets 21 will just abut.

[0034] Furthermore, the mounting part 211 itself does not need to undergo deformation, and the material of the mounting part 211 is a common existing technology in this field. For example, in the "Design Specification for High Temperature and High Pressure Pipeline Supports and Hangers in Thermal Power Plants" (DL / T 5054-2016) and related valve design manuals, for limit supports and load-bearing structures with operating temperatures of 600℃~800℃, it is generally recommended to use austenitic heat-resistant stainless steel (such as 06Cr25Ni20 / 310S) or precipitation-hardening heat-resistant steel (such as 0Cr17Ni4Cu4Nb / 17-4PH).

[0035] In this application, the mounting portion 211 of the bracket 21 can be made of such austenitic heat-resistant stainless steel (such as 310S). This type of material can still maintain a high yield strength at ultra-high temperatures of 800°C (the yield strength of 310S can still reach more than 120MPa at 800°C), which fully meets the requirements for use as a rigid limiting component.

[0036] On the upper side of the mounting portion 211, i.e., the side opposite to the inner valve body 11, a protrusion 2111 is provided. This protrusion 2111 is used to connect the spring 23. Specifically, one end of the spring 23 is fixedly connected to the protrusion 2111, for example, by welding. Correspondingly, on the radial inner wall surface of the outer valve body 12, i.e., the bottom surface of the mounting cavity 121, a plurality of hooks 122 are provided, each hook 122 corresponding to a spring 23. The other end of the spring 23 is provided with a collar 231, which can be easily hooked onto the hook 122, realizing a detachable connection between the spring 23 and the outer valve body 12. This design facilitates the replacement of the spring 23 during maintenance.

[0037] When the butterfly valve is assembled at room temperature without being heated, the spring 23 is in a stretched state. At this time, the elastic restoring force of the spring 23 is applied to the mounting portion 211 of the bracket 21 through the protrusion 2111, and then transmitted to the fixing portion 112 of the inner valve body 11. Since the tension direction of the spring 23 is radially outward, it is completely consistent with the deformation direction of the deformation portion 111 bulging towards the mounting cavity 121 at high temperature. Therefore, the pre-tension force of the spring 23 becomes an active aid for the radial outward bulging of the deformation portion 111. When the temperature rises and the material of the inner valve body 11 begins to deform due to heat, the spring 23, which is already in a stretched state, will contract accordingly, actively "pulling" the deformation portion 111 of the inner valve body 11 outward, thereby responding to thermal expansion earlier and further enhancing the valve's "anti-jamming" effect.

[0038] Furthermore, multiple brackets 21 are spaced apart within the mounting cavity 121. When the deformable portion 111 of the inner valve body 11 reaches its maximum deformation under ultra-high temperature, the sides of the mounting portions 211 of two adjacent brackets 21 will abut against each other. This limiting mechanism effectively prevents the deformable portion 111 from bulging excessively beyond the design allowable range, thereby protecting the inner valve body 11 from damage due to excessive plastic deformation and ensuring the structural integrity and service life of the valve during repeated thermal cycles.

[0039] When the pipeline transporting the high-temperature medium begins to heat up, the heat is first transferred to the inner valve body 11 and the butterfly plate 13. At high temperatures, the butterfly plate 13 undergoes radial outward thermal expansion deformation. Simultaneously, the inner valve body 11 as a whole also undergoes thermal expansion, with its outer surface displaced radially outward and its inner surface displaced radially inward. In traditional valve body structures made of a single material with uniform wall thickness, this inward displacement of the inner surface directly leads to a significant increase in the interference fit of the sealing surface, thereby causing the butterfly plate 13 to seize.

[0040] Because the deformable portion 111 of the inner valve body 11 has a thinner wall and lower hardness, and its coefficient of thermal expansion is intentionally chosen to be greater than that of the two fixed portions 112, the radial expansion potential of the deformable portion 111 is greater than that of the fixed portions 112 when the temperature rises sharply. More importantly, the fixed portions 112 located on both sides of the deformable portion 111 also expand due to heat, but because their ends are fixed to the axial wall surface of the mounting cavity 121, their axial expansion displacement is restricted. The resulting huge thermal stress is forced to be released to the weak link in the middle—the deformable portion 111. The fixed portions 112 apply strong axial compressive stress to the deformable portion 111. Because the deformable portion 111 is thin and has poor rigidity, it is very easy to become unstable under the action of axial pressure, thus being forced to undergo radially outward "bulging" deformation towards the bottom surface of the mounting cavity 121.

[0041] This "bulge" action directly leads to an increase in the diameter of the inner surface of the deformation section 111. This expansion of the inner surface of the deformation section 111 not only completely absorbs and offsets the displacement caused by the inward expansion of the inner valve body 11 material due to heat, but also further increases the original design clearance between it and the outer edge of the butterfly plate 13. Therefore, at high temperatures, there is no interference between the butterfly plate 13 and the inner valve body 11; instead, a more ample clearance is achieved than at room temperature. At this time, the valve stem 14, driven by the external actuator, can easily and freely rotate the butterfly plate 13, completely eliminating the risk of failure due to a surge in opening and closing torque or complete jamming caused by thermal expansion.

[0042] In this process, the spring-loaded assembly 2 plays a crucial auxiliary and protective role. First, the rivet 22 firmly fixes the bracket 21 to the outer valve body 12, while the arc-shaped mounting portion 211 of the bracket 21 maintains close surface contact with the outer surface of the fixing portion 112 of the inner valve body 11. This structure provides the inner valve body 11 with an elastic radial support system. When the deformable portion 111 is heated and attempts to bulge outward, the pre-stretched spring 23 provides an initial pulling force in the same direction, which assists in ensuring that the bulging action of the deformable portion 111 can be smoothly initiated. At the same time, the spring-loaded portion 212 of the bracket 21 undergoes adaptive bending deformation when the deformable portion 111 bulges outward. It neither rigidly hinders the outward expansion of the inner valve body 11, nor does it use its own elastic restoring force to assist the inner valve body 11 in returning to its original position when the inner valve body 11 cools and contracts, preventing it from plastically collapsing or permanently deforming under repeated thermal shocks.

[0043] In summary, the ultra-high temperature double-layer hard-seal butterfly valve provided in this embodiment, through the difference in thickness, hardness, and coefficient of thermal expansion between the deformable part 111 and the fixed part 112 of the inner valve body 11, combined with the boundary conditions of fixed ends and the tapered guidance of the outer diameter of the fixed part 112, achieves controllable and directional bulging deformation of the deformable part 111 into the mounting cavity 121 under high temperature, actively expanding the sealing gap. Simultaneously, the spring-loaded assembly 2, composed of a bracket 21, rivets 22, and springs 23, provides unidirectional pre-tightening assistance and elastic guiding constraint for the bulging of the deformable part 111. This dual-action mechanism of the valve body assembly 1 and the spring-loaded assembly 2 significantly improves the valve's operational reliability, opening and closing flexibility, and long-term service capability under extreme high-temperature conditions.

[0044] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A high-temperature double-layer hard-seal butterfly valve, characterized in that, include: The valve body assembly (1) includes an inner valve body (11), an outer valve body (12), a butterfly plate (13), and a valve stem (14). The butterfly plate (13) is rotatably disposed within the inner valve body (11). One end of the valve stem (14) is fixed to the butterfly plate (13), and the other end of the valve stem (14) passes through the outer valve body (12) and is rotatably connected to the outer valve body (12). The inner valve body (11) includes a deformable part (111) and two fixed parts (112) fixedly disposed on both sides of the deformable part (111) along its axial direction. The butterfly plate (13)... The inner valve body (11) abuts against the deformable part (111), the thickness of the deformable part (111) is less than the thickness of the fixed part (112), and the hardness of the deformable part (111) is less than the hardness of the fixed part (112); the inner side of the outer valve body (12) is provided with an annular mounting cavity (121), the inner valve body (11) is located in the mounting cavity (121), and the two fixed parts (112) are respectively fixed to the two axial walls of the mounting cavity (121), and the inner valve body (11) and the bottom surface of the mounting cavity (121) are spaced apart; The spring-loaded assembly (2) is disposed in the mounting cavity (121) and includes multiple brackets (21) and multiple rivets (22). The rivets (22) fix the brackets (21) and the outer valve body (12). The brackets (21) abut against the outer surfaces of the fixing part (112) and the deformable part (111). The bracket (21) includes mounting portions (211) at both ends of the bracket (21). The upper side of the mounting portion (211) is provided with a protrusion (2111), and the lower side of the mounting portion (211) contacts the radial outer surface of the inner valve body (11).

2. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 1, characterized in that, Along the direction away from the deformable part (111), the diameter of each fixing part (112) gradually decreases, causing the deformable part (111) to deform towards the mounting cavity (121) when heated; The coefficient of thermal expansion of the deformable part (111) is greater than that of the fixed part (112).

3. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 1, characterized in that, The bracket (21) further includes a spring-loaded part (212) and a connecting part (213), wherein the mounting part (211) and the connecting part (213) are both arranged at an angle to the spring-loaded part (212); The connecting part (213) is provided with a threaded hole (2131). The connecting part (213) is fixedly connected to one end of the rivet (22) through the threaded hole (2131). The other end of the rivet (22) abuts against the outer side of the outer valve body (12) in the radial direction.

4. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 1, characterized in that, The rebound assembly (2) also includes a spring (23), one end of which is fixedly connected to the protrusion (2111), and the protrusion (2111) is correspondingly arranged with the spring (23); The bracket (21) is provided correspondingly to the rivet (22), and each bracket (21) is provided at intervals. When the deformable part (111) reaches the set deformation, each mounting part (211) abuts against the side of the other mounting part (211).

5. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 4, characterized in that, The outer valve body (12) is provided with a plurality of hooks (122) on its radial inner wall surface, and the hooks (122) are provided corresponding to the spring (23); The other end of the spring (23) is provided with a collar (231), and the other end of the spring (23) is detachably connected to the hook (122) through the collar (231).

6. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 4, characterized in that, The mounting portion (211) facing the inner valve body (11) is arc-shaped, and the radius of the arc is equal to the radius of the radial outer surface of the inner valve body (11) so that the radial outer surface of the inner valve body (11) contacts the surface of the mounting portion (211).

7. The ultra-high temperature double-layer hard-seal butterfly valve according to claim 4, characterized in that, When the butterfly valve is not heated to a high temperature, the spring (23) is in a stretched state; In the radial direction, the protrusion (2111) is located on the radial outer side of the deformed part (111).

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