Ultra-low temperature self-compensating flexible seal butterfly valve

Abstract

The application relates to the technical field of butterfly valves, and provides an ultralow-temperature self-compensation flexible sealing butterfly valve, which comprises a valve body, a valve rod, a moving assembly and a valve plate, the valve body is provided with a fluid channel, the valve rod is arranged in the valve body, the valve rod can rotate around the axis thereof, the moving assembly is arranged on the valve rod, the moving assembly is located in the fluid channel, and the valve plate is movably connected to one end of the moving assembly along the axial direction of the fluid channel; wherein the moving assembly is used for driving the valve plate to gradually move along the axial direction of the fluid channel so as to close the fluid channel. The ultralow-temperature self-compensation flexible sealing butterfly valve provided by the application applies continuous pressure to the valve plate through the moving assembly, so that the sealing performance cannot be invalidated due to low temperature, reliable flow regulation capability is maintained, the sealing reliability and service life of the butterfly valve under the ultralow-temperature working condition are improved, the maintenance and replacement frequency caused by sealing invalidation is reduced, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of butterfly valves, and particularly relates to an ultralow-temperature self-compensation flexible sealing butterfly valve. BACKGROUND

[0002] A butterfly valve is a regulating valve that controls the opening and closing of the valve by rotating a butterfly plate. An ultralow-temperature butterfly valve is a butterfly valve that can normally open and close in an ultralow-temperature environment and can maintain sealing performance.

[0003] In the related art, the sealing element of the ultralow-temperature butterfly valve is prone to deformation and failure in an ultralow-temperature environment, thereby affecting the sealing performance of the butterfly valve. SUMMARY

[0004] The present application provides an ultralow-temperature self-compensation flexible sealing butterfly valve, which can improve the technical problem that the sealing element of the butterfly valve is prone to deformation and affects the sealing performance in an ultralow-temperature environment in the related art.

[0005] The present application provides an ultralow-temperature self-compensation flexible sealing butterfly valve, which can improve the technical problem that the sealing element of the butterfly valve is prone to deformation and affects the sealing performance in an ultralow-temperature environment in the related art.

[0006] A valve body has a fluid passage;

[0007] A valve rod is arranged in the valve body, and the valve rod can rotate around its own axis;

[0008] A moving assembly is arranged on the valve rod, and the moving assembly is located in the fluid passage;

[0009] A valve plate is movably connected to one end of the moving assembly along the axial direction of the fluid passage;

[0010] The moving assembly is used to drive the valve plate to gradually move along the axial direction of the fluid passage to close the fluid passage.

[0011] The technical solution described above in the present application has at least the following technical effects:

[0012] The ultra-low temperature self-compensation flexible sealing butterfly valve provided by the embodiment of the present application has a valve rod arranged in a valve body, the valve rod can rotate around its own axis, a moving assembly is arranged on the valve rod, a valve plate is movably arranged at one end of the moving assembly along the axis direction of the fluid passage, thus, the moving assembly is driven to rotate around the axis of the valve rod by the valve rod, and then the valve plate is driven to rotate around the axis of the valve rod, so as to adjust the flow of the fluid passage, the moving assembly can drive the valve plate to move along the axis direction of the fluid passage, so that the fluid passage is in communication or cut off, the moving assembly can continuously push the valve plate, so as to compensate for the shrinkage deformation or wear of the valve plate in the ultra-low temperature environment, the moving assembly continuously applies pressure to the valve plate, so as to maintain the sealing performance and reliable flow adjustment capability, the sealing reliability and service life of the butterfly valve in the ultra-low temperature working condition are improved, the maintenance and replacement frequency caused by sealing failure is reduced, and the maintenance cost is reduced.

[0013] In some embodiments, the moving assembly comprises:

[0014] a housing, the housing is arranged on the valve rod along the axis direction of the fluid passage;

[0015] a sensing member, the sensing member is arranged in the housing away from one end of the valve plate;

[0016] a moving member, the moving member is movably arranged in the housing along the axis direction of the fluid passage; one end of the moving member is connected to one end of the sensing member facing the valve plate; the other end of the moving member is connected to the valve plate;

[0017] wherein, the sensing member is used for moving the moving member along the axis direction of the fluid passage towards the valve plate.

[0018] In some embodiments, the sensing member is a spring; one end of the spring abuts against the inner wall of the housing away from the valve plate; the other end of the spring is connected to one end of the moving member; the spring is made of shape memory alloy; the spring can elongate with the decrease of temperature.

[0019] In some embodiments, the moving member is a first piston, the first piston is movably arranged in the housing along the axis direction of the fluid passage; one end of the first piston is connected to one end of the sensing member facing the valve plate; the other end of the first piston is connected to the valve plate; the outer surface of the first piston is in sliding friction with the inner surface of the housing.

[0020] In some embodiments, one end of the moving member facing the sensing member forms a first space with the inner wall of the housing; the valve rod comprises:

[0021] An outer rod passes through the valve body; the outer rod is rotatable about its own axis; the outer rod has a hollow space along its own axis;

[0022] An inner rod is movably disposed within the hollow space along the axial direction of the outer rod;

[0023] The second piston is disposed at one end of the inner rod near the moving assembly; the outer peripheral surface of the second piston slides and rubs against the inner peripheral surface of the outer rod; the end face of the second piston near the moving assembly and the inner surface of the outer rod together form a second space;

[0024] A connecting pipe, one end of which is connected to the second space; the other end of which is connected to the end of the housing away from the valve plate; the connecting pipe is used to connect the second space to the first space.

[0025] In some embodiments, the cryogenic self-compensating flexible sealing butterfly valve further includes a drive device disposed on the valve stem; the drive device is used to drive the outer rod to rotate about the axis of the outer rod and to drive the inner rod to move along the axis of the outer rod.

[0026] In some embodiments, the driving device includes:

[0027] A first driving member, one end of which is rotatably mounted on the valve body about the valve stem axis; the power output end of the first driving member is connected to the outer rod; the first driving member has a through hole along the axial direction of the valve stem; the first driving member is used to drive the outer rod to rotate about the axial direction of the outer rod.

[0028] A second driving member is movably disposed through the through hole along the axial direction of the outer rod; the outer surface of the second driving member is in contact with the inner surface of the through hole; the power output end of the second driving member is connected to the inner rod; the second driving member is used to drive the inner rod to move along the axial direction of the outer rod.

[0029] In some embodiments, the valve plate has a groove on the side facing the fluid output end of the valve body; the valve plate is movable along the axial direction of the fluid channel until the valve stem is located in the groove.

[0030] In some embodiments, the cryogenic self-compensating flexible sealing butterfly valve further includes a locking device disposed on the valve body; the locking device is used to restrict the valve plate from rotating about the axis of the valve stem when the valve plate is in the locked position.

[0031] In some embodiments, the valve plate has a first inclined surface; it also includes an inclined valve seat; the inclined valve seat is disposed on the inner surface of the valve body; the inclined valve seat has a second inclined surface;

[0032] The valve plate can move along the axial direction of the fluid channel to abut against the inclined valve seat, and the first inclined surface can fit against the second inclined surface to cut off the fluid channel. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1 A schematic diagram of the structure of the cryogenic self-compensating flexible sealing butterfly valve in the shut-off state, provided in an embodiment of this application;

[0035] Figure 2 A schematic diagram of the structure of the cryogenic self-compensating flexible sealing butterfly valve when it is turned on, as provided in the embodiments of this application;

[0036] Figure 3 A schematic diagram of a portion of the structure of the cryogenic self-compensating flexible sealing butterfly valve provided in an embodiment of this application;

[0037] Figure 4 This is a cross-sectional structural diagram of the cryogenic self-compensating flexible sealing butterfly valve provided in the embodiments of this application.

[0038] The following are the labeling elements in the figure:

[0039] 100. Cryogenic self-compensating flexible sealing butterfly valve; 10. Valve body; 101. Fluid passage; 20. Valve stem; 201. First space; 202. Outer rod; 2021. Hollow space; 203. Inner rod; 204. Second piston; 205. Second space; 206. Connecting pipe; 30. Moving component; 301. Housing; 302. Sensing element; 303. Moving element; 3031. First piston; 40. Valve plate; 401. Groove; 402. First inclined surface; 50. Drive device; 501. First drive element; 502. Second drive element; 60. Locking device; 601. Valve plate detection device; 602. Drive motor; 603. Locking tongue; 70. Inclined valve seat; 701. Second inclined surface; A. Fluid flow direction. Detailed Implementation

[0040] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application. The terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0042] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0043] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0045] In this application, "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist; for example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0046] It should be noted that in this application, the words "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of words such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of this application. The appearance of the above words in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0047] In ultra-low temperature self-compensating flexible sealing butterfly valves, the toughness and strength of the sealing material will be reduced in ultra-low temperature environments. The sealing material will be more prone to deformation and wear, resulting in gaps on the sealing surface, which will affect the sealing performance and cause the butterfly valve to leak.

[0048] Based on this, in order to improve the technical problem that the sealing performance of butterfly valves is easily affected by deformation and wear of the sealing components in ultra-low temperature environments, the embodiments of this application provide the following solutions.

[0049] Please refer to the following: Figure 1 and Figure 2 This application provides a cryogenic self-compensating flexible sealing butterfly valve 100, which includes a valve body 10, a valve stem 20, a moving assembly 30, and a valve plate 40. The valve body 10 has a fluid channel 101; a sealing element is provided on the inner wall of the fluid channel 101, and the sealing element protrudes from the inner wall of the fluid channel 101; the valve stem 20 is rotatably mounted on the valve body 10 around its own axis and partially extends into the fluid channel 101; the moving assembly 30 is located in the fluid channel 101 and is disposed on the valve stem 20; the valve plate 40 is located in the fluid channel 101 and is movably connected to one end of the moving assembly 30 along the axial direction of the fluid channel 101; wherein, when the end face of the valve plate 40 is rotated to a direction perpendicular to the axial direction of the fluid channel 101, the moving assembly 30 pushes the valve plate 40 along the axial direction of the fluid channel 101, so that the valve plate 40 abuts against the sealing element to close the fluid channel 101.

[0050] It is understood that the valve body 10 is a component used to accommodate the valve seat, valve plate 40, etc. The valve body 10 needs to maintain good toughness and strength in ultra-low temperature environments. The valve body 10 can be made of 316L stainless steel or low-carbon molybdenum-containing austenitic stainless steel, but is not limited to these. The projected shape of the fluid channel 101 along its own axis can be circular or square, but is not limited to these.

[0051] The valve stem 20 is a component used to drive the valve plate 40 to rotate about the axis of the valve stem 20, which is perpendicular to the axis of the fluid passage 101.

[0052] The moving component 30 is used to push the valve plate 40 along the axial direction of the fluid channel 101 when the end face of the valve plate 40 is rotated to a direction perpendicular to the axial direction of the fluid channel 101, so that the valve plate abuts against the seal. The moving component 30 can be a hydraulically driven telescopic rod, and the extension and retraction of the moving component 30 can be controlled by controlling the input and output of the hydraulic medium, thereby driving the valve plate 40 to move along the axial direction of the fluid channel 101; or it can be a connecting rod connected to the valve plate 40, and the valve plate 40 can be driven to move along the axial direction of the fluid channel 101 by manually moving the connecting rod, but it is not limited to this.

[0053] The cryogenic self-compensating flexible sealing butterfly valve 100 may also include a valve seat, which is disposed inside the valve body 10. The valve plate 40 is a component used to cooperate with the valve seat to control the opening and closing of the fluid passage 101 and control the flow rate. The valve plate 40 can cooperate with the valve seat in the form of a hard seal with metal friction fit or a soft seal with a surface covered with rubber.

[0054] As can be seen from the above, the cryogenic self-compensating flexible sealing butterfly valve 100 provided in this application embodiment has a valve stem 20 inserted into the valve body 10. The valve stem 20 can rotate around its own axis. A moving component 30 is provided on the valve stem 20. The valve plate 40 is movably disposed at one end of the moving component 30 along the axial direction of the fluid channel 101. Thus, by driving the moving component 30 to rotate around the axis of the valve stem 20 through the valve stem 20, the valve plate 40 is driven to rotate around the axis of the valve stem 20 to adjust the flow rate of the fluid channel 101. The moving component 30 can rotate to a position perpendicular to the end face of the valve plate 40. When the fluid passage 101 is aligned with the axis, the valve plate 40 is pushed along the axis of the fluid passage 101, causing the valve plate 40 to abut against the seal and closing the fluid passage 101. The moving component 30 can maintain the thrust on the valve plate 40 to compensate for the shrinkage deformation or wear of the valve plate 40 under ultra-low temperature conditions. The moving component 30 applies continuous pressure to the valve plate 40 to maintain the contact pressure between the valve plate 40 and the seal, thereby improving the sealing reliability and service life of the butterfly valve under ultra-low temperature conditions, reducing the frequency of maintenance and replacement due to seal failure, and lowering maintenance costs.

[0055] Optionally, the valve plate 40 is disposed at one end of the movable assembly 30 near the fluid input end of the valve body 10.

[0056] It is understood that the fluid input end of the valve body 10 is the high-pressure side, and it is filled with fluid when the butterfly valve is open and closed; the fluid output end of the valve body 10 is the low-pressure side, and there is usually no fluid at the fluid output end of the valve body 10 when the butterfly valve is closed.

[0057] This configuration, placing the valve plate 40 at the end of the moving component 30 near the fluid input end of the valve body 10, avoids prolonged contact between the moving component 30 and the fluid, reduces the time and cost of maintaining the moving component 30 in cryogenic environments, effectively extends the lifespan of the moving component 30, improves the sensitivity of the butterfly valve operation, enhances the reliability of the butterfly valve, and significantly reduces the cost and time required for butterfly valve maintenance.

[0058] In some embodiments, please refer to the following: Figures 1 to 4 The moving component 30 includes a housing 301, a sensor 302, and a moving component 303. The housing 301 is disposed on the valve stem 20 along the axial direction of the fluid channel 101. The sensor 302 is disposed inside the housing 301 at one end away from the valve plate 40. The moving component 303 is movably disposed inside the housing 301 along the axial direction of the fluid channel 101. One end of the moving component 303 is connected to the end of the sensor 302 facing the valve plate 40. The other end of the moving component 303 is connected to the valve plate 40. The sensor 302 is used to move the moving component 303 toward the valve plate 40 along the axial direction of the fluid channel 101.

[0059] It is understood that the housing 301 is a component used to isolate the fluid and form a sealed space. The inner surface of the housing 301 may be provided with grooves 401 or raised tracks to guide the moving part 303 to move along the axial direction of the fluid channel 101. The sensing element 302 is a component used to provide a force to push the moving part 303 to move towards the seal along the axial direction of the fluid channel 101. For example, it may be an electrically controlled actuation assembly, a hydraulic drive assembly, etc.

[0060] With this configuration, the sensing element 302 and the moving element 303 are housed inside the housing 301. One end of the sensing element 302 is located inside the housing 301, away from the valve plate 40. One end of the moving element 303 is connected to the other end of the sensing element 302, and the valve plate 40 is connected to the other end of the moving element 303. The moving element 303 is driven to move by the sensing element 302, which in turn drives the valve plate 40 to move along the axis of the fluid channel 101. This enhances the adaptability of the moving component 30, improves its reliability and stability in low-temperature environments, and enhances the sealing performance of the butterfly valve.

[0061] In some embodiments, please refer to Figure 3The sensing element 302 is a spring; one end of the spring abuts against the inner wall of the housing 301 away from the valve plate 40; the other end of the spring is connected to one end of the moving element 303; the spring is made of shape memory alloy; the spring can stretch as the temperature decreases.

[0062] It is understandable that the spring can be made of shape memory alloy to maintain the elasticity of the metal in ultra-low temperature environments and allow the spring to stretch as the temperature decreases. For example, the spring can be made of nickel-titanium-based shape memory alloy or iron-manganese-silicon-nickel-based shape memory alloy, but is not limited to these. After the spring is compressed, it is installed in the housing 301 so that the spring always maintains a thrust on the moving part 303 toward the valve plate 40, thereby maintaining the contact pressure between the valve plate 40 and the valve seat when the butterfly valve is closed.

[0063] This design, using a shape memory alloy spring, allows the spring to further elongate as the temperature decreases in ultra-low temperature environments. This compensates for the contraction of the valve plate 40, valve seat, and valve body 10 due to low temperatures and wear caused by long-term use. It maintains contact pressure between the valve plate 40 and the valve seat, effectively enhancing the sealing performance of the butterfly valve, extending its service life, eliminating the need for frequent maintenance by operators, reducing maintenance workload and operational complexity, and lowering maintenance costs.

[0064] It should be noted that the structure of the sensing element 302 is not limited to the structure described above. In some other embodiments, the sensing element 302 may include a drive component and a temperature sensor. The ultra-low temperature self-compensating flexible sealing butterfly valve also includes a controller. The controller is set outside the valve body 10. The controller is electrically connected to the drive component and the temperature sensor respectively. The temperature sensor detects the temperature inside the housing 301 and feeds the temperature signal back to the controller. According to the signal from the temperature sensor, the controller controls the drive component to drive the moving part 303 to move toward the valve plate 40 as the temperature decreases, thereby increasing the contact pressure between the valve plate 40 and the valve seat. The controller may be a microcontroller, PLC, etc.

[0065] For example, the drive component can be an electromagnetic coil, and a magnet can be provided on the moving part 303. The magnitude and direction of the current input to the electromagnetic coil can be controlled by the controller to control the moving direction and distance of the moving part 303.

[0066] For example, the drive assembly may include a track, a motor, a lead screw, and a slide table. The movable member 303 is disposed on the slide table, and the slide table is movably disposed on the track. The power output end of the motor is connected to the lead screw, which is disposed along the length direction of the track. The direction of the current input to the motor is controlled by the controller to drive the lead screw to rotate, thereby controlling the moving direction of the slide table, and thus driving the movable member 303 to move. However, this is not the only possible scenario.

[0067] In some embodiments, please refer to Figure 3 andFigure 4 The movable component 303 includes a first piston 3031 and a piston rod. The first piston 3031 is movably disposed in the housing 301 along the axial direction of the fluid channel 101. One end of the first piston 3031 is connected to the end of the sensing component 302 facing the valve plate 40. One end of the piston rod is connected to the other end of the first piston 3031. The other end of the piston rod is connected to the valve plate 40. The outer surface of the first piston 3031 slides and rubs against the inner surface of the housing 301.

[0068] It is understood that the first piston 3031 is a component used to drive the valve plate 40 by being driven by the sensing element 302. The outer peripheral surface of the first piston 3031 slides and rubs against the inner surface of the housing 301. The first piston 3031 is connected to the valve plate 40 by a piston rod, and the two ends of the piston rod are respectively connected to the first piston 3031 and the valve plate 40 by threads; or the two ends of the piston rod can be welded to the end faces of the first piston 3031 and the valve plate 40 respectively, but it is not limited to this.

[0069] With this configuration, the first piston 3031 is placed inside the housing 301. The kinetic energy of the sensing element 302 is transmitted through the first piston 3031, making the movement of the valve plate 40 along the axial direction of the fluid channel 101 controllable. This also avoids direct contact between the first piston 3031 and the low-temperature fluid, reducing the frequency of damage to the first piston 3031 due to low temperature and extending its service life, thereby improving the reliability and safety of the butterfly valve.

[0070] In some embodiments, please refer to Figure 3 and Figure 4 The moving part 303, facing the sensing part 302, forms a first space 201 with the inner wall of the housing 301; the valve stem 20 includes an outer rod 202, an inner rod 203, a second piston 204, and a connecting pipe 206, the outer rod 202 passing through the valve body 10; the outer rod 202 is rotatable about its own axis; the outer rod 202 has a hollow space 2021 along its own axis; the inner rod 203 is movably disposed in the hollow space 2021 along the axial direction of the outer rod 202; the second piston 204... The inner rod 203 is positioned at one end near the moving assembly 30; the outer circumferential surface of the second piston 204 slides and rubs against the inner circumferential surface of the outer rod 202; the end face of the second piston 204 near the moving assembly 30 and the inner surface of the outer rod 202 together form a second space 205; one end of the connecting pipe 206 is connected to the second space 205; the other end of the connecting pipe 206 is connected to the end of the housing 301 away from the valve plate 40; the connecting pipe 206 is used to connect the second space 205 to the first space 201. The first space 201 and the second space 205 are filled with a pressure medium.

[0071] It is understood that the outer rod 202 is a component used to drive the moving component 30 and the valve plate 40 to rotate around the axis of the outer rod 202. The outer rod 202 may have a through hole along the axis of the fluid channel 101, through which the moving component 30 is inserted, or the moving component 30 may be set on the outer peripheral surface of the outer rod 202 by welding or gluing, but is not limited to these.

[0072] The inner rod 203 is a component used to move along the axis of the outer rod 202 to change the volume of the second space 205. The inner rod 203 can pass through the outer rod 202, or it can be rotated to move along the axis of the outer rod 202 by providing an external thread on the outer surface of the inner rod 203 and a matching internal thread on the inner surface of the outer rod 202, but it is not limited to these methods. The outer diameter of the inner rod 203 can be equal to or smaller than the inner diameter of the outer rod 202, but it is not limited to these methods.

[0073] The second piston 204 is a component used to divide the hollow space 2021 of the outer rod 202 to form the second space 205 and maintain the airtightness of the second space 205. The outer diameter of the second piston 204 is equal to the inner diameter of the outer rod 202. A sealing element may be provided on the outer circumferential surface of the second piston 204 to enhance the sealing performance. The second space 205 and the first space 201 are filled with a pressure medium, which may be cryogenic hydraulic oil, liquid helium, liquid nitrogen, etc., but is not limited to these.

[0074] The connecting tube 206 is a component used to connect the first space 201 and the second space 205. The connecting tube 206 can be a plastic tube or a metal tube that can maintain good performance in ultra-low temperature environments, but is not limited to these.

[0075] With this configuration, the outer rod 202 passes through the valve body 10 and can rotate around its own axis. A hollow space 2021 is formed along the outer rod 202's axis. The inner rod 203 is disposed within the hollow space 2021 and can move along the axis of the outer rod 202. A second piston 204 is disposed at the end of the inner rod 203 near the moving assembly 30. The inner rod 203 drives the second piston 204 to move along the axis of the outer rod 202, changing the volume of the second space 205. The connecting pipe 206 connects the second space 205 to the first space 201. Pressure medium is filled in both the second space 205 and the first space 201. By moving the inner rod 203 to drive the second piston 204, the volume of the second space 205 is changed, thereby changing the volume of the first space 201. The size of space 201 drives the first piston 3031 to move, thereby moving the valve plate 40. This allows the inner rod 203 to move, increasing the volume of the second space 205 and compressing the volume of the first space 201. This causes the moving part 303 to overcome the thrust of the sensing part 302 and move towards the sensing part 302, thereby moving the valve plate 40 towards the valve stem 20. This opens the fluid passage 101, allowing the valve plate 40 to rotate to regulate the flow rate of the butterfly valve. The operator can directly control the movement of the valve plate 40 through the inner rod 203 and control the rotation of the valve plate 40 through the outer rod 202. This saves space, improves the integration of the butterfly valve system, facilitates butterfly valve maintenance, and reduces the difficulty of operating the butterfly valve at low temperatures. It enables the butterfly valve to provide precise flow regulation and reliable sealing performance in ultra-low temperature environments.

[0076] In some embodiments, please refer to Figures 1 to 4 The cryogenic self-compensating flexible sealing butterfly valve 100 also includes a drive device 50, which is disposed on the valve stem 20. The drive device 50 is used to drive the outer rod 202 to rotate around the axis of the outer rod 202 and to drive the inner rod 203 to move along the axis of the outer rod 202.

[0077] It is understood that the drive device 50 is used to drive the outer rod 202 and the inner rod 203 respectively. The drive device 50 can generate power manually by the operator or by converting electrical energy into power through a motor, but is not limited to these methods. The power output end of the drive device 50 can be connected to the outer rod 202 or the inner rod 203 respectively, so as to drive the outer rod 202 to rotate around the axis of the outer rod 202 or drive the inner rod 203 to move along the axis of the outer rod 202.

[0078] With this configuration, the outer rod 202 can be rotated or the inner rod 203 can be moved by the drive device 50, so as to achieve precise control of the position of the valve plate 40, improve the accuracy of the butterfly valve's opening and closing and the flow rate, and improve the convenience of the butterfly valve control, making the butterfly valve easy to use.

[0079] In some embodiments, please refer to Figures 1 to 4The driving device 50 includes a first driving member 501 and a second driving member 502. One end of the first driving member 501 is rotatably mounted on the valve body 10 around the axis of the valve stem 20. The power output end of the first driving member 501 is connected to the outer rod 202. The first driving member 501 has a through hole along the axial direction of the valve stem 20. The first driving member 501 is used to drive the outer rod 202 to rotate around the axial direction of the outer rod 202. The second driving member 502 passes through the through hole. The outer surface of the second driving member 502 is attached to the inner surface of the through hole. The power output end of the second driving member 502 is connected to the inner rod 203. The second driving member 502 is used to drive the inner rod 203 to move along the axis of the outer rod 202.

[0080] It is understood that the first driving component 501 may include a cylinder, one end of which is connected to the valve body 10 via a bearing. The inner side of the cylinder is connected to the outer side of the outer rod 202. The axis of the cylinder is collinear with the axis of the outer rod 202. A handle is provided on the outer surface of the cylinder for manual rotation, or a motor is provided, with the power output end of the motor connected to the cylinder to drive the cylinder to rotate, thereby driving the outer rod 202 to rotate, but not limited to this. The second driving component 502 may include a cylinder with threads on its outer surface. A matching thread is provided on the inner surface of the through hole of the first driving component 501, allowing the cylinder to move along the axis of the outer rod 202 via the threads. One end of the cylinder is connected to one end of the inner rod 203. A handle is provided on the outer surface of the cylinder for manual rotation, or a motor is provided, with the power output end of the motor connected to the cylinder to drive the cylinder to rotate, thereby driving the inner rod 203 to move along the axis of the outer rod 202, but not limited to this.

[0081] With this configuration, the first drive member 501 is rotatably mounted on the valve body 10, and the power output end of the first drive member 501 is connected to the outer rod 202, enabling the first drive member 501 to drive the outer rod 202 to rotate. A through hole is opened on the first drive member 501 along the axial direction of the outer rod 202, and the second drive member 502 is movably inserted through the first drive member 501 along the axial direction of the outer rod 202, enabling the second drive member 502 to drive the inner rod 203 to move along the axial direction of the outer rod 202. This allows for separate control of the movement of the valve plate 40 along the axis of the fluid channel 101 and the rotation around the axis of the valve stem 20. The first drive member 501 and the second drive member 502 are highly integrated, effectively saving space, improving the flexibility of butterfly valve installation and use, and having a simple structure that is easy to use and maintain, effectively reducing the time and cost required for maintenance.

[0082] In some embodiments, please refer to Figures 1 to 4 The valve plate 40 has a groove 401 on the side facing the fluid input end of the valve body 10; the valve plate 40 can move along the axial direction of the fluid channel 101 until the valve stem 20 is located in the groove 401.

[0083] It can be understood that the groove 401 is a structure used to accommodate the valve stem 20, thereby reducing the radius of rotation of the valve plate 40 around the axis of the valve stem 20; the bottom surface of the groove 401 can be a plane or an arc surface that can mate with the outer surface of the valve stem 20.

[0084] With this configuration, a groove 401 is provided on the side of the valve plate 40 facing the fluid output end of the valve body 10, so that the valve plate 40 can move along the axial direction of the fluid channel 101 until the valve stem 20 is located in the groove 401. This can effectively reduce the radius of rotation of the valve plate 40 around the axis of the valve stem 20, thereby making the butterfly valve structure compact, effectively reducing the size of the butterfly valve, improving space utilization, and facilitating the installation of the butterfly valve.

[0085] In some embodiments, please refer to Figure 1 and Figure 2 The cryogenic self-compensating flexible sealing butterfly valve 100 also includes a locking device 60, which is disposed on the valve body 10. The locking device 60 is used to restrict the valve plate 40 from rotating around the axis of the valve stem 20 when the valve plate 40 is in the locked position.

[0086] It is understood that the locking device 60 is a device used to restrict the rotation of the valve plate 40 around the axis of the valve stem 20. The locked position is the position where the valve plate 40 is in contact with the valve seat to cut off the fluid passage 101. The locking device 60 can determine whether the valve plate 40 is in the locked position by detecting the angle and position of the valve plate 40. The locking device 60 can restrict the rotation of the valve stem 20 by disconnecting the connection between the first driving member 501 and the outer rod 202, thereby restricting the valve stem 20 from rotating with the valve stem 20. Alternatively, the locking device 60 can abut against the outer rod 202 to increase the friction with the outer surface of the outer rod 202, thereby restricting the rotation of the valve stem 20, thereby restricting the valve stem 20 from rotating with the valve stem 20. However, it is not limited to these methods.

[0087] With this configuration, the locking device 60 is installed on the valve body 10. The locking device 60 detects the position of the valve plate 40. When the valve plate 40 is in the locked position that can cut off the fluid passage 101, it restricts the rotation of the valve plate 40 around the axis of the valve stem 20, effectively preventing leakage of the butterfly valve due to misoperation, and avoiding damage to the moving component 30 due to misoperation. This improves the safety and reliability of the butterfly valve, extends its service life, reduces the frequency of butterfly valve maintenance, and saves the cost required for butterfly valve maintenance.

[0088] Optionally, please refer to Figure 1 and Figure 2The locking device 60 includes a valve plate detection device 601, a drive motor 602, and a locking tongue 603. The valve plate detection device 601 is disposed inside the valve body 10; the drive motor 602 is disposed on the outer peripheral surface of the valve body 10; the drive motor 602 is electrically connected to the valve plate detection device 601; the locking tongue 603 is movably disposed on the drive motor 602 in a direction perpendicular to the axis of the valve stem 20; wherein, the drive motor 602 is used to drive the locking tongue 603 to move in a direction perpendicular to the axis of the valve stem 20 until it abuts against the outer peripheral surface of the valve stem 20, so that the valve stem 20 cannot rotate.

[0089] It is understood that the valve plate detection device 601 is disposed within the fluid channel 101. The valve plate detection device 601 can determine the position of the valve plate 40 by detecting the angle of the valve plate 40, for example, by using a magnetic angle sensor; or it can determine the position of the valve plate 40 by the flow rate within the fluid channel 101. The greater the flow rate within the fluid channel 101, the more the width direction of the valve plate 40 tends to be parallel to the axis of the fluid channel 101, for example, by using a flow meter, but not limited to this. The drive motor 602 is a mechanism for providing driving force in a direction perpendicular to the axis of the valve stem 20, for example, by using an electric telescopic rod, or by using an electric slide rail and slide table, but not limited to this. The locking tongue 603 is a component used to generate friction on the outer peripheral surface of the valve stem 20 to limit the rotation of the valve stem 20. One end of the locking tongue 603 is connected to the drive motor 602, and the other end of the locking tongue 603 can fit against the outer peripheral surface of the valve stem 20. The end face of the other end of the locking tongue 603 can be covered with a rubber pad, or the end face of the other end of the locking tongue 603 can be engraved with grooves to increase the friction with the outer peripheral surface of the valve stem 20, but it is not limited to this.

[0090] With this configuration, the valve plate detection device 601 is placed inside the valve body 10 to detect the position and angle of the valve plate 40 in real time. The drive motor 602 is located on the outer circumference of the valve body 10 and is electrically connected to the valve plate detection device 601. The locking tongue 603 is movably connected to the drive motor 602 in a direction perpendicular to the axis of the valve stem 20. When the valve plate detection device 601 detects that the valve plate 40 is in the locked position, it sends a signal to the drive motor 602. The drive motor 602 drives the locking tongue 603 to move towards the valve stem 20, so that the locking tongue 603 abuts against the valve stem 20, restricting the rotation of the valve stem 20. This effectively reduces manual intervention, prevents misoperation, and prevents damage to the valve stem 20 and valve plate 40 caused by misoperation. It effectively extends the service life of the butterfly valve and reduces the maintenance frequency and cost of parts.

[0091] In some embodiments, please refer to Figures 2 to 4The valve plate 40 has a first inclined surface 402; the cryogenic self-compensating flexible sealing butterfly valve 100 also includes an inclined valve seat 70; the inclined valve seat 70 is disposed on the inner surface of the valve body 10; the inclined valve seat 70 has a second inclined surface 701; wherein, the valve plate 40 can move along the axial direction of the fluid channel 101 to abut against the inclined valve seat 70, and the first inclined surface 402 can fit against the second inclined surface 701 to cut off the fluid channel 101.

[0092] It is understandable that the sealing surfaces of the valve plate 40 and the inclined valve seat 70 are inclined surfaces. Rubber seals can be covered on the inclined surfaces to achieve a soft seal, or a hard seal can be achieved through metal friction.

[0093] With this configuration, the contact surfaces of the valve plate 40 and the valve seat are both set as inclined surfaces. In ultra-low temperature environments, the valve plate 40, valve seat, or valve body 10 shrinks, but the inclined surfaces of the valve plate 40 and the valve seat can still maintain a large area of ​​good contact, thereby enhancing the sealing performance and reliability of the butterfly valve. At the same time, the inclined surfaces can change the axial force applied by the moving component 30 along the axis of the fluid channel 101 into a radial force perpendicular to the inclined surfaces. By moving the valve plate 40, the gap caused by the shrinkage of the valve plate 40 can be flexibly compensated, simplifying the compensation direction of the butterfly valve. This simplifies the structure of the butterfly valve, making it easier to use, adjust, and maintain, and effectively extending the service life of the butterfly valve.

[0094] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A cryogenic self-compensating flexible sealing butterfly valve, characterized in that, include: A valve body having a fluid passage, and a sealing element protruding from the inner wall of the fluid passage; A valve stem, which is rotatably mounted on the valve body about its own axis and extends partially into the fluid passage; A movable component, located within the fluid channel and disposed on the valve stem; A valve plate, located within the fluid channel and movably connected to one end of the movable assembly along the axial direction of the fluid channel; The movable component is used to push the valve plate along the axial direction of the fluid channel when the end face of the valve plate is rotated to a direction perpendicular to the axis of the fluid channel, so that the valve plate abuts against the seal to close the fluid channel; The moving component includes: A housing, which is disposed on the valve stem along the axial direction of the fluid passage; A sensing element is disposed within the housing at one end away from the valve plate; A movable component is movably disposed within the housing along the axial direction of the fluid channel; one end of the movable component is connected to the end of the sensing element facing the valve plate; the other end of the movable component is connected to the valve plate. The sensing element is used to move the moving element toward the valve plate along the axial direction of the fluid channel; The end of the movable component facing the sensing element forms a first space with the inner wall of the housing; the valve stem includes: An outer rod passes through the valve body; the outer rod is rotatable about its own axis; the outer rod has a hollow space along its own axis; An inner rod is movably disposed within the hollow space along the axial direction of the outer rod; The second piston is disposed at one end of the inner rod near the moving assembly; the outer peripheral surface of the second piston slides and rubs against the inner peripheral surface of the outer rod; the end face of the second piston near the moving assembly and the inner surface of the outer rod together form a second space; A connecting pipe, one end of which is connected to the second space; the other end of which is connected to the end of the housing away from the valve plate; the connecting pipe is used to connect the second space to the first space; The first space and the second space are filled with a pressure medium.

2. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, The sensing element is a spring; one end of the spring abuts against the inner wall of the housing at the end away from the valve plate; the other end of the spring is connected to one end of the moving element; the spring is made of shape memory alloy; the spring can stretch as the temperature decreases.

3. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, The movable component is a first piston, which is movably disposed within the housing along the axial direction of the fluid channel; one end of the first piston is connected to the end of the sensing component facing the valve plate; the other end of the first piston is connected to the valve plate; the outer surface of the first piston slides and rubs against the inner surface of the housing.

4. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, It also includes a driving device, which is disposed on the valve stem; the driving device is used to drive the outer rod to rotate about the axis of the outer rod and to drive the inner rod to move along the axis of the outer rod.

5. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 4, characterized in that, The driving device includes: A first driving member, one end of which is rotatably mounted on the valve body about the valve stem axis; the power output end of the first driving member is connected to the outer rod; the first driving member has a through hole along the axial direction of the valve stem; the first driving member is used to drive the outer rod to rotate about the axial direction of the outer rod. A second driving member is movably disposed through the through hole along the axial direction of the outer rod; the outer surface of the second driving member is in contact with the inner surface of the through hole; the power output end of the second driving member is connected to the inner rod; the second driving member is used to drive the inner rod to move along the axial direction of the outer rod.

6. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, The valve plate has a groove on the side facing the fluid input end of the valve body; the valve plate can move along the axial direction of the fluid channel until the valve stem is located in the groove.

7. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, It also includes a locking device disposed on the valve body; the locking device is used to restrict the valve plate from rotating about the axis of the valve stem when the valve plate is in the locked position.

8. The cryogenic self-compensating flexible sealing butterfly valve as described in claim 1, characterized in that, The valve plate has a first inclined surface; it also includes an inclined valve seat; the inclined valve seat is disposed on the inner surface of the valve body; the inclined valve seat has a second inclined surface; The valve plate can move along the axial direction of the fluid channel to abut against the inclined valve seat, and the first inclined surface can fit against the second inclined surface to cut off the fluid channel.

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