Sealing butterfly valve

Abstract

The invention discloses a sealing butterfly valve and belongs to the technical field of butterfly valves, the sealing butterfly valve comprises a valve seat, a valve rod and a butterfly plate, the valve rod is provided with a first air channel and a first air inlet which are communicated, and an air inlet connector is arranged at the first air inlet; the butterfly plate is provided with a second air passage and a second air outlet which are communicated, the butterfly plate is connected with the valve rod, the first air passage is communicated with the second air passage, the butterfly plate comprises a sealing surface, and the butterfly plate is in sealing connection with the valve seat through the sealing surface; and the second air outlet is formed in the sealing surface. The through type gas cooling channel is formed by the valve rod and the butterfly plate, the second gas outlet is formed in the sealing face of the butterfly plate and serves as an outlet of the cooling channel to discharge a cooling medium so as to form active convection cooling, the cooling medium directly acts on a high-temperature area, namely, the area where the butterfly plate makes contact with a flow channel medium in the butterfly valve, and the heat dissipation efficiency is high; heat of the butterfly plate and the valve rod can be prevented from being transmitted to the actuator, and the service life of the actuator is prolonged.

Description

Technical Field

[0001] This application relates to the field of butterfly valve technology, and more particularly to a sealing butterfly valve. Background Technology

[0002] High-temperature valves for marine engines are mainly used to regulate the flow of high-temperature exhaust gas from the engine. Compared with other applications of high-temperature valves, marine engines are characterized by high compactness, high sealing performance, alternating high temperature, and easy carbon deposition.

[0003] Because of the thermal conductivity of butterfly valves, heat from the flowing medium is transferred upwards to the actuator, affecting the actuator's service life. In related technologies, traditional heat dissipation methods make the butterfly valve structure more complex. Summary of the Invention

[0004] This application provides a sealing butterfly valve, which aims to solve the technical problem of the overly complex cooling structure of the sealing butterfly valve.

[0005] Technical solution: This application discloses a sealing butterfly valve, comprising: Valve seat; A valve stem having a first air passage and a first air inlet connected together, and an air inlet connector being provided at the first air inlet. The butterfly plate has a second air passage and a second air outlet that are connected to each other. The butterfly plate is connected to the valve stem. The first air passage is connected to the second air passage. The butterfly plate includes a sealing surface. The butterfly plate is sealed to the valve seat through the sealing surface. The second air outlet is located on the sealing surface.

[0006] In some embodiments, the butterfly plate includes a connected assembly portion and a sealing portion. The assembly portion has a shaft hole, the valve stem passes through the shaft hole and is connected to the assembly portion, the valve seat has an assembly hole, the sealing portion passes through the assembly hole, and the sealing portion has a sealing surface on the side facing the valve seat.

[0007] In some embodiments, the sealing butterfly valve further includes a connector that passes through and connects the valve stem and the butterfly plate. The connector has a third air passage, a third air inlet, and a third air outlet. The third air inlet is located within the first air passage and is connected to both the first air passage and the third air passage. The third air outlet is located within the second air passage and is connected to both the second air passage and the third air passage.

[0008] In some embodiments, the valve stem further has a first air outlet, which is opened on the outer peripheral wall of the valve stem and communicates with the first air passage; The butterfly plate also has a second air inlet, which is opened on the inner wall of the shaft hole and communicates with the second air passage. The first air outlet is correspondingly arranged with the second air inlet and communicates with each other.

[0009] In some embodiments, the sealing butterfly valve further includes a valve body, wherein both the butterfly plate and the valve seat are disposed within the valve body; The valve seat includes a body portion and a protrusion portion connected to each other. The body portion is detachably connected to the valve body. The body portion has the mounting hole. The protrusion portion is disposed on the side of the body portion facing the sealing portion and abuts against the sealing surface. The second air outlet is located between the protrusion and the assembly part.

[0010] In some embodiments, the connector is fitted with the valve stem and the butterfly plate using a low-temperature cold fitting process to form an interference fit; And / or, the tail of the connector is provided with a positioning block, the assembly part is provided with a positioning groove, and the connector is positioned and engaged with the positioning block and the positioning groove.

[0011] In some embodiments, there are multiple second air outlets, and the multiple second air outlets are arranged in an array along the sealing trajectory of the sealing surface.

[0012] In some embodiments, the medium pressure inside the valve body is less than the medium pressure in the first air passage and the second air passage.

[0013] In some embodiments, the sealing butterfly valve further includes a sealing ring, which is sleeved on the body portion and sealably connects the body portion and the valve body.

[0014] In some embodiments, the second airway includes a first channel, a second channel, and a third channel, wherein the first channel, the second channel, and the third channel are all disposed within the sealing portion and are interconnected with each other. The first channel and the second channel are arranged in a cross shape, and the third channel is in a ring shape and located outside the first channel and the second channel.

[0015] In some embodiments, the sealing butterfly valve further includes a valve body, the butterfly plate and the valve stem are rotatably disposed in the valve body, the valve body is provided with a cleaning hole, and the butterfly plate can rotate and switch between a first position and a second position under the drive of the valve stem; When the butterfly plate is in the first position, the butterfly plate is sealed to the valve seat through the sealing surface; When the butterfly plate is in the second position, the sealing surface of the butterfly plate is correspondingly arranged with the cleaning hole, and the cleaning hole is configured to connect to an external cleaning device so as to clean the sealing surface through the external cleaning device.

[0016] In some embodiments, the sealing butterfly valve further includes a bracket and a valve body, the bracket being connected above the valve body, the butterfly plate and the valve stem being rotatably disposed within the valve body, the bracket being provided with an actuator, the bracket having a first hole, one end of the valve stem passing through the first hole and being drivenly connected to the actuator, and the other end passing through the valve body and being connected to the butterfly plate; The sealing butterfly valve further includes a gland assembly and a packing assembly. The packing assembly is sleeved on the valve stem and passes through the first hole. The gland assembly is movably sleeved on the valve stem and abuts against the packing assembly. The first air inlet is located between the gland assembly and the actuator.

[0017] In some embodiments, the valve body is provided with a limiting block for limiting the rotation angle of the butterfly plate.

[0018] In some embodiments, the support is provided with heat dissipation fins, which are configured to dissipate heat from the packing assembly.

[0019] Beneficial Effects: The sealing butterfly valve in this embodiment includes a valve seat, a valve stem, and a butterfly plate. The valve stem has a first air passage and a first air inlet connected together, with an air inlet connector at the first air inlet. The butterfly plate has a second air passage and a second air outlet connected together. The butterfly plate is connected to the valve stem, and the first and second air passages are connected. The butterfly plate includes a sealing surface, which is sealed to the valve seat. The second air outlet is located on the sealing surface. A through-type gas cooling channel is constructed by the valve stem and the butterfly plate. The valve stem is equipped with an air inlet connector to introduce a cooling medium, such as compressed air, into the cooling channel. The sealing surface of the butterfly plate has a second air outlet, which serves as the outlet of the cooling channel to discharge the cooling medium, thus forming active convection cooling. The cooling medium directly acts on the high-temperature area, i.e., the area where the butterfly plate and the medium in the flow channel inside the butterfly valve come into contact. This results in high heat dissipation efficiency and can block the transfer of heat from the butterfly plate and valve stem to the actuator, extending the service life of the actuator.

[0020] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments 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.

[0022] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0023] Figure 1 This is a schematic diagram of the main structure of the sealing butterfly valve in the embodiments of this application; Figure 2 for Figure 1 A cross-sectional view along the SS direction; Figure 3 for Figure 1 Cross-sectional view along the MM direction; Figure 4 for Figure 2 A magnified view of a portion of point A in the middle; Figure 5 This is a partially enlarged schematic diagram of point A in another embodiment of this application; Figure 6 This is a schematic diagram of the valve stem in the sealing butterfly valve of this application embodiment, with a partial cross-sectional view showing the first air inlet. Figure 7 This is a schematic diagram of the butterfly plate in the sealing butterfly valve of this application embodiment; Figure 8 for Figure 7 A cross-sectional view along the BB direction; Figure 9 for Figure 8 A cross-sectional view along the CC direction; Figure 10 This is a half-sectional view of the valve body in the sealing butterfly valve of this application embodiment, and the limiting block is shown in the figure.

[0024] Explanation of reference numerals in the attached figures: 10. Valve stem; 100. First air passage; 101. First air inlet; 102. First air outlet; 103. Air inlet connector; 20. Butterfly plate; 200. Second air passage; 201. Second air inlet; 202. Second air outlet; 21. Assembly part; 22. Sealing part; 210. Shaft hole; 211. Positioning groove; 220. Sealing surface; 203. First channel; 204. Second channel; 205. Third channel; 30. Valve seat; 300. Assembly hole; 301. Body; 302. Protrusion; 303. Sealing ring; 40. Connector; 400. Third air passage; 401. Third air inlet; 402. Third air outlet; 410. Positioning block; 50. Valve body; 501. Cleaning port; 51. Limit stop; 60. Bracket; 600. First hole; 61. Heat dissipation fins; 70. Actuator; 80. Capping assembly; 90. Packing assembly. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0026] In the description of this application, it should be understood that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and 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, and therefore should not be construed as a limitation of this application. In the description of this application, "multiple" means two or more, and "at least one" can refer to one, two, or more, unless otherwise explicitly specified. The terms "first," "second," and "third," etc., are only for the convenience of description and are used to name components or embodiments by number, and do not imply any order of importance between the components or embodiments.

[0027] As an introduction to this application, high-temperature valves for marine engines are mainly used to regulate the flow rate of high-temperature exhaust gas from engines. Compared with other applications of high-temperature valves, marine engines are characterized by high compactness, high sealing performance, alternating high temperatures, and easy carbon buildup. Because the thermal conductivity of butterfly valves transfers heat from the flowing medium upwards to the actuator, it affects the actuator's service life. In related technologies, traditional heat dissipation methods make the structure of butterfly valves more complex. In existing technologies, heat dissipation fins are usually installed on the valve body or valve cover to assist in heat dissipation and reduce the transfer of heat from the medium to the sealing gland, actuator, etc. However, finned high-temperature valves have poor compactness and limited heat dissipation. In addition, some valves use coolant or water on the valve body and valve cover to reduce the heat transferred by the flowing medium. Water-cooled high-temperature valves have complex cooling chamber structures, high manufacturing costs, complex cooling systems, and large structural dimensions. Furthermore, the carbon deposits formed on the sealing surface of high-temperature butterfly valves at high temperatures are difficult to clean, affecting sealing performance and switching torque. Most methods involve replacing the butterfly valve or disassembling and cleaning it with high-temperature steam, resulting in high maintenance costs and low maintenance efficiency.

[0028] In view of this, embodiments of this application provide a sealing butterfly valve, which aims to solve at least one of the above-mentioned technical problems.

[0029] Please see Figure 1 and Figure 2As shown, the sealing butterfly valve in this embodiment includes a valve seat 30, a valve stem 10, and a butterfly plate 20. The valve stem 10 has a first air passage 100 and a first air inlet 101 connected together, and an air inlet connector 103 is provided at the first air inlet 101. The butterfly plate 20 has a second air passage 200 and a second air outlet 202 connected together. The butterfly plate 20 is connected to the valve stem 10, and the first air passage 100 and the second air passage 200 are connected together. The butterfly plate 20 includes a sealing surface 220, and the butterfly plate 20 is sealed to the valve seat 30 through the sealing surface 220. The second air outlet 202 is opened on the sealing surface 220. It is important to understand that a through-type gas cooling channel is constructed by the valve stem 10 and the butterfly plate 20. The valve stem 10 is equipped with an air inlet connector 103 to introduce cooling medium, such as compressed air, into the cooling channel. The sealing surface 220 of the butterfly plate 20 has a second air outlet 202, which serves as the outlet of the cooling channel to discharge the cooling medium, thus forming active convection cooling. The cooling medium acts directly on the high-temperature area, that is, the area where the butterfly plate 20 contacts the medium in the flow channel of the butterfly valve. This results in high heat dissipation efficiency and can block the transfer of heat from the butterfly plate 20 and valve stem 10 to the actuator 70, extending the service life of the actuator 70. At the same time, the cooling medium is directly sprayed out from the air outlet on the sealing surface 220, purging the sealing surface 220. The continuous airflow can form an air film, preventing carbon deposits from accumulating on the sealing surface 220 and maintaining good sealing performance. Meanwhile, the airflow can clean the carbon deposits formed on the sealing surface 220, reducing the switching torque, lessening the load on the actuator 70, and reducing energy consumption. Furthermore, the cooling effect of compressed air reduces the risk of high-temperature deformation of the disc 20, maintaining its stable sealing performance. Finally, the above solution achieves online cleaning of the sealing surface 220 without stopping the machine for disassembly and inspection, reducing maintenance costs and improving maintenance efficiency.

[0030] This application utilizes the internal space of the valve stem 10 and the butterfly plate 20 to construct a cooling channel, eliminating the need for additional external structures. Its structure is simple and does not occupy extra space. Furthermore, the manufacturing process of the sealing butterfly valve in this application is simple, reducing the number of parts, improving overall compactness, and lowering manufacturing costs. Simultaneously, it eliminates the need for complex cooling systems such as cooling circulation pumps and water tanks, reducing leakage risk and improving system stability.

[0031] Please see Figure 3As shown, in some embodiments, the butterfly plate 20 includes a connected assembly portion 21 and a sealing portion 22. The assembly portion 21 has a shaft hole 210, through which the valve stem 10 passes and is connected to the assembly portion 21. The valve seat 30 has an assembly hole 300, through which the sealing portion 22 passes. The sealing portion 22 has a sealing surface 220 on the side facing the valve seat 30. It should be understood that the rigid connection between the assembly portion 21 and the valve stem 10 makes the connection more stable under high temperature alternating environment. At the same time, the rigid connection provides the basic conditions for the air passage communication between the valve stem 10 and the butterfly plate 20, ensuring the continuous communication between the first air passage 100 and the second air passage 200. In some embodiments, the butterfly plate 20 adopts an integrally molded structure to reduce the deformation between the assembly portion 21 and the sealing portion 22, reducing the risk of air passage blockage or leakage. The sealing part 22 passes through the mounting hole 300 of the valve seat 30 and is sealed to the valve seat 30 through the sealing surface 220, which enhances the structural stability between the valve plate and the valve seat 30 and ensures the sealing performance between them. At the same time, the second air outlet 202 opened on the sealing surface 220 allows the cooling gas to act directly on the contact area between the sealing surface 220 and the valve seat 30, thus doubly enhancing the cleaning and sealing effects.

[0032] Please see Figure 3 As shown, in some embodiments, the portion of the valve stem 10 that passes through the shaft hole 210 is provided with a spline, and the shaft hole 210 is a spline hole. The fit between the spline and the spline hole ensures the reliability of the transmission between the valve stem 10 and the assembly part 21.

[0033] Please see Figure 2 and Figure 4As shown, in some embodiments, the sealing butterfly valve further includes a connector 40, which passes through and connects the valve stem 10 and the butterfly plate 20. The connector 40 has a third air passage 400, a third air inlet 401, and a third air outlet 402. The third air inlet 401 is located within the first air passage 100 and connects the first air passage 100 and the third air passage 400. The third air outlet 402 is located within the second air passage 200 and connects the second air passage 200 and the third air passage 400. It should be understood that the connector 40 not only connects the valve stem 10 and the butterfly plate 20, but also serves as a transition between the first air passage 100 and the second air passage 200. The connector 40 is partially inserted into the first air passage 100 of the valve stem 10 and partially inserted into the second air passage 200 of the butterfly plate 20. It extends into the first air passage 100 through the third air inlet 401 and into the second air passage 200 through the third air outlet 402, achieving complete connectivity between the first air passage 100, the third air passage 400, and the second air passage 200. This solves the problems of large gaps between the first air passage 100 of the valve stem 10 and the second air passage 200 of the butterfly plate 20, poor connectivity caused by air passage axis deviation, and poor sealing. The third air passage 400 of the connector 40 serves as a transition channel, enhancing the seal at the connection point between the first air passage 100 and the second air passage 200. This ensures sufficient cooling gas reaches the outlet of the sealing surface 220, reducing the risk of cooling gas leakage and improving gas utilization.

[0034] Furthermore, the connector 40 is used to rigidly fix the valve stem 10 to the butterfly plate 20, disperse the connection stress between the valve stem 10 and the butterfly plate 20, reduce the risk of airway misalignment and blockage caused by thermal deformation, adapt to the alternating high temperature environment of marine applications, and improve the structural reliability of the sealing butterfly valve. The connector 40 in this application is a cylindrical locating pin with a hollow structure.

[0035] Please see Figure 5 As shown, in some embodiments, the valve stem 10 further has a first air outlet 102, which is located on the outer peripheral wall of the valve stem 10 and communicates with the first air passage 100; the butterfly plate 20 further has a second air inlet 201, which is located on the inner wall of the shaft hole 210 and communicates with the second air passage 200. The first air outlet 102 and the second air inlet 201 are correspondingly arranged and interconnected. It should be understood that by aligning the first air outlet 102 of the valve stem 10 with the second air inlet 201 of the butterfly plate 20, the tight fit between the valve stem 10 and the butterfly plate 20 provides a natural seal for the air passage, allowing the first air passage 100 and the second air passage 200 to be connected, reducing the number of parts, lowering manufacturing and assembly costs, and further improving structural compactness.

[0036] Please see Figure 3As shown, in some embodiments, the sealing butterfly valve further includes a valve body 50, with the butterfly plate 20 and valve seat 30 both disposed within the valve body 50. The valve seat 30 includes a body portion 301 and a protrusion 302 connected to each other. The body portion 301 is detachably connected to the valve body 50. The body portion 301 has an assembly hole 300. The protrusion 302 is disposed on the side of the body portion 301 facing the sealing portion 22 and abuts against the sealing surface 220. The second air outlet 202 is located between the protrusion 302 and the assembly portion 21. It should be understood that by forming a line / surface abutment between the protrusion structure of the valve seat 30 and the sealing surface 220 of the butterfly plate 20, the sealing pressure is increased, the contact area between the sealing surface 220 and the valve seat 30 is reduced, thereby reducing the dead angle of carbon residue. The partial abutment of the protrusion 302 makes the sealing area more concentrated, reducing the problem of loose fit caused by high temperature deformation. The second air outlet 202 is positioned between the protrusion 302 and the assembly part 21, allowing the cooling airflow to directly impact the contact point between the sealing surface 220 and the protrusion 302. This ensures that the airflow is concentrated on the sealing contact interface where carbon deposits easily accumulate, improving the cleaning effect. The body part 301 and the valve body 50 are detachable, allowing for individual disassembly and maintenance of the valve seat 30 without the need for complete disassembly of the valve body 50, thus improving maintenance efficiency and reducing maintenance costs. Simultaneously, the detachable design allows for fine-tuning of the position of the body part 301, compensating for assembly tolerances between the valve seat 30 and the valve body 50, and improving the compatibility between them.

[0037] In some embodiments, the connector 40 is fitted with the valve stem 10 and the butterfly plate 20 using a cryogenic cold fitting process to form an interference fit. It is important to understand that the cryogenic cold fitting process compensates for material expansion at high temperatures by pre-storing a larger interference amount, thus addressing the issue of loosening of the connection under alternating high-temperature environments. The cryogenic cold fitting only cools the connector 40, causing no thermal damage or mechanical injury to the valve stem 10 or the butterfly plate 20, further improving the precision of the interference fit control and ensuring a balance between fit strength and air passage sealing. The uniform interference fit formed by the cryogenic cold fitting distributes vibration stress across the entire mating surface, avoiding localized stress concentration and improving structural stability under high-frequency vibration.

[0038] Please see Figure 4 and Figure 8As shown, in some embodiments, the insertion direction of the connector 40 is perpendicular to the axial direction of the valve stem 10. Mounting holes are provided on the butterfly plate 20 and the valve stem 10 for the connector 40 to pass through. In some embodiments, a positioning block 410 is provided at the tail of the connector 40, and a positioning groove 211 is provided on the assembly part 21. The connector 40 is positioned and engaged with the positioning block 410 and the positioning groove 211. It should be understood that the engagement of the positioning block 410 and the positioning groove 211 ensures that the third air inlet 401 is located within the first flow channel, the third air outlet 402 is located within the second flow channel, and the third flow channel of the positioning pin is fully connected to the first flow channel of the valve stem 10 and the second flow channel of the butterfly plate 20, achieving positioning assembly and improving assembly efficiency. Simultaneously, the mechanical locking action of the positioning block 410 and the positioning groove 211 can resist the circumferential torsion and axial sliding of the connector 40 caused by the high-frequency vibration and alternating high temperature of the marine engine, thereby improving the stability of the air passage connection.

[0039] Please see Figure 3 and Figure 7 As shown, in some embodiments, there are multiple second air outlets 202, which are arranged in an array along the sealing trajectory of the sealing surface 220. It should be understood that the contact area between the sealing surface 220 of the butterfly plate 20 and the protrusion 302 of the valve seat 30 is annular. The multiple second air outlets 202 are evenly arranged along the annular trajectory to achieve full coverage of the sealing core area. The even distribution of multiple second air outlets 202 improves the cooling uniformity of the sealing part 22, reduces the temperature gradient of the sealing surface 220 at different locations, reduces the risk of warping deformation of the sealing surface 220 due to uneven thermal stress, and improves the protection of the sealing surface 220. Multi-point purging creates airflow superposition, forming a continuous airflow barrier at the contact gap between the sealing trajectory and the protrusion 302, preventing high-temperature exhaust gas from directly scouring the sealing surface 220, thus reducing carbon buildup at the source. Multi-point diversion increases the effective purging force at each point of the sealing trajectory, achieving efficient cleaning without increasing the intake pressure, improving gas utilization efficiency, and reducing energy consumption.

[0040] It should be understood that the array arrangement of the second air outlet 202 can be flexibly adjusted in terms of the number and angle of the air outlets according to the shape of the sealing trajectory (such as a circle or an eccentric circle), to adapt to the butterfly valve design of different types of marine engines.

[0041] In some embodiments, the medium pressure within the valve body 50 is lower than the medium pressure within the first air passage 100 and the second air passage 200. It should be understood that the pressure difference is used to create an active forward airflow, driving the cooling and cleaning medium, such as compressed air, to flow from the air passage towards the valve body 50, while simultaneously preventing the high-temperature exhaust gas from the valve body 50 from reversing into the air passage. The pressure difference increases the airflow velocity at the second outlet 202, enhancing the purging impact and improving the cleaning effect. The high-speed airflow discharged from the second outlet 202 increases cleaning power while improving cooling efficiency, further reducing the risk of thermal deformation. Since the medium pressure within the air passage is greater than the pressure within the flow channel of the valve body 50, the high-pressure airflow forms a continuous air curtain at the contact gap between the sealing surface 220 and the protrusion 302, preventing the high-temperature exhaust gas from directly contacting the sealing surface 220, reducing carbon buildup at the source. Simultaneously, the air curtain also serves as an auxiliary seal, further meeting the high sealing requirements for marine applications.

[0042] Please see Figure 3 As shown, in some embodiments, the sealing butterfly valve further includes a sealing ring 303, which is sleeved on the body portion 301 and seals the body portion 301 and the valve body 50. It should be understood that by providing the sealing ring 303 between the body portion 301 and the valve body 50, on the one hand, the sealer can fill the mating gap caused by the detachable connection, ensuring the sealing performance after the valve body 50 and valve seat 30 are connected, completely preventing the medium from overflowing from the connection seam between the body portion 301 and the valve body 50; on the other hand, the high-frequency vibration during marine engine operation and the difference in thermal deformation between the body portion 301 and the valve body 50 can easily lead to micro-gaps in the rigid connection. The elastic buffering effect of the sealing ring 303 can absorb vibration energy and compensate for the dimensional deviations caused by thermal deformation, ensuring a stable seal under dynamic operating conditions and avoiding sudden leakage caused by vibration loosening or thermal deformation cracking.

[0043] In some embodiments, a seal is provided between the bracket 60 and the valve body 50, and a cover plate is provided at the bottom of the valve body 50, with a seal also provided between the cover plate and the valve body 50. It should be understood that the above-described sealing structure design ensures the sealing performance of the valve body 50.

[0044] Please see Figure 7 、and 8 and Figure 9As shown, in some embodiments, the second air passage 200 includes a first channel 203, a second channel 204, and a third channel 205. The first channel 203, second channel 204, and third channel 205 are all located within the sealing portion 22 and are interconnected. The first channel 203 and second channel 204 are arranged in a cross shape, while the third channel 205 is annular and located outside the first channel 203 and second channel 204. It should be understood that the cross-shaped arrangement of the first channel 203 and second channel 204 and the annular arrangement of the third channel 205 construct an integrated airflow transmission structure that combines diversion and collection, effectively improving the uniformity of airflow distribution at each second air outlet 202. This ensures that the airflow pressure difference and velocity deviation are controlled within a preset reasonable range, guaranteeing a stable and balanced cooling and purging airflow across the entire sealing trajectory of the sealing surface 220, and avoiding problems such as localized cooling blind spots and incomplete carbon removal.

[0045] The first cross-shaped channel 203 and the second cross-shaped channel 204 avoid the central stress area of ​​the sealing part 22, while the third annular channel 205 is arranged along the outer periphery of the sealing part 22. These three channels form a hollow skeleton structure. The solid part of the sealing part 22 forms a support frame composed of cross-shaped and annular ribs, improving the structural strength and high-temperature mechanical stability of the sealing part 22, suppressing the deformation of the sealing part 22 under alternating high temperatures and sealing pressures, and ensuring the fitting accuracy between the sealing surface 220 and the protrusion 302 of the valve seat 30. The adaptive design of the cross-shaped and annular channels reduces the turning resistance and pressure loss during airflow transmission, improving airflow transmission efficiency. Combined with the pressure difference setting within the air passage and valve body 50, the airflow velocity at the second outlet 202 is maintained within the high-efficiency operating range, ensuring effective cooling and heat dissipation, as well as carbon deposit removal capabilities.

[0046] Please see Figure 2 and Figure 3 As shown, in some embodiments, the sealing butterfly valve further includes a valve body 50, with the butterfly plate 20 and valve stem 10 rotatably disposed within the valve body 50. A cleaning hole 501 is provided on the valve body 50. The butterfly plate 20 can rotate between a first position and a second position under the drive of the valve stem 10. In the first position, the butterfly plate 20 is sealed to the valve seat 30 via a sealing surface 220. In the second position, the sealing surface 220 of the butterfly plate 20 corresponds to the cleaning hole 501. The cleaning hole 501 is configured to connect to an external cleaning device for cleaning the sealing surface 220. It should be understood that by providing a cleaning hole 501 in the valve body 50 and allowing the butterfly plate 20 to rotate between a sealing position (first position) and a cleaning position (second position) under the drive of the valve stem 10, an offline cleaning function for the sealing surface 220 is achieved.

[0047] When the butterfly plate 20 is in the second position, the sealing surface 220 and the cleaning hole 501 are precisely aligned. External cleaning equipment can directly act on the sealing surface 220 through the cleaning hole 501, and deep cleaning can be completed without disassembling the valve body 50. This significantly reduces the complexity of maintenance operations, shortens the maintenance cycle, and avoids potential damage to the sealing surface 220 and related components during traditional disassembly and inspection.

[0048] When the butterfly plate 20 is in the first position, it reliably seals against the valve seat 30 through the sealing surface 220, ensuring that the sealing performance of the valve during normal operation is not affected by the setting of the cleaning hole 501, thus balancing sealing reliability and maintenance convenience. During daily operation, the sealing surface 220 is initially cleaned online via air jets through the air passage. During regular maintenance, the sealing surface 220 is deeply cleaned through the cleaning hole 501, forming a dual online and offline cleaning mechanism. This effectively improves the thoroughness of carbon deposit removal from the sealing surface 220, ensuring the sealing performance and switching torque stability of the sealing surface 220, and extending the service life of the butterfly valve.

[0049] Please see Figure 2 and Figure 6 As shown, in some embodiments, the sealing butterfly valve further includes a bracket 60 and a valve body 50. The bracket 60 is connected above the valve body 50. The butterfly plate 20 and the valve stem 10 are rotatably disposed within the valve body 50. An actuator 70 is provided on the bracket 60. The bracket 60 has a first hole 600. One end of the valve stem 10 passes through the first hole 600 and is connected to the actuator 70 for transmission. The other end passes through the valve body 50 and is connected to the butterfly plate 20. The sealing butterfly valve also includes a gland assembly 80 and a packing assembly 90. The packing assembly 90 is sleeved on the valve stem 10 and passes through the first hole 600. The gland assembly 80 is movably sleeved on the valve stem 10 and abuts against the packing assembly 90. The first air inlet 101 is located between the gland assembly 80 and the actuator 70. It is important to understand that the bracket 60, as a load-bearing structure, not only provides an installation base for the actuator 70, but also enables the transmission connection between the valve stem 10 and the actuator 70 through the first hole 600, ensuring that the driving force of the actuator 70 is efficiently transmitted to the butterfly plate 20 and guaranteeing the accuracy of valve opening and closing actions.

[0050] The gland assembly 80 includes a butterfly spring, which is bolted to the packing assembly 90. When oxidation leakage occurs in the packing assembly 90, the butterfly spring can automatically compensate by tightening the packing in the packing assembly 90, thus providing both sealing and automatic compensation. The packing assembly 90 is fitted onto the valve stem 10 and passes through the first hole 600. Together with the pressing action of the gland assembly 80, it forms a dynamic sealing structure between the valve stem 10 and the bracket 60. This effectively prevents the leakage of high-temperature media (containing corrosive components and carbon deposits) from the valve body 50 along the gap between the valve stem 10 and the first hole 600, keeping the leakage rate extremely low. Furthermore, the movable design of the gland assembly 80 allows for adjustment of the clamping force according to sealing requirements, ensuring the stability of the sealing performance during long-term use.

[0051] The first air inlet 101 is located between the gland assembly 80 and the actuator 70. When the cooling medium enters the first air passage 100 from this location, it pre-cools the section of the valve stem 10 near the actuator 70, reducing the conduction of high temperature from the valve stem 10 to the actuator 70. Combined with the subsequent air passage cooling the butterfly plate 20, this forms a layered cooling mechanism: pre-cooling of the upper part of the valve stem 10 and core cooling of the butterfly plate 20. This lowers the operating temperature of the actuator 70, significantly extending its service life. Simultaneously, the cooling medium flowing through the valve stem 10 indirectly cools the packing assembly 90, slowing down its aging caused by high temperatures, extending the packing replacement cycle, and further reducing maintenance costs. This comprehensively improves the reliability and economy of the sealed butterfly valve in high-temperature, high-sealing environments. The above cooling structure design can significantly reduce the length of the valve stem 10, resulting in a high degree of compactness, meeting the space layout requirements of marine engines and enhancing the overall size advantage.

[0052] In some embodiments, a connecting sleeve is provided at one end of the valve stem 10, and the valve stem 10 is connected to the actuator 70 through the connecting sleeve. A flat key is provided between the valve stem 10 and the connecting sleeve. The above structural design can prevent the valve stem 10 from flying out due to some abnormal situation, thereby improving safety.

[0053] In some embodiments, a bushing is provided between the valve stem 10 and the valve body 50, and the bushing can ensure the wear resistance of the valve stem 10.

[0054] Please see Figure 10 As shown, in some embodiments, a limiting block 51 is provided inside the valve body 50 to limit the rotation angle of the butterfly plate 20. Through the mechanical limiting action of the limiting block 51, the rotation angle of the butterfly plate 20 is constrained, ensuring that the butterfly plate 20 switches stably within a preset working angle range. This effectively prevents the butterfly plate 20 from overtravel due to actuator 70 control errors, vibration impacts, or improper operation, and avoids jamming of the butterfly plate 20 due to excessive torque.

[0055] In some embodiments, the bracket 60 is provided with heat dissipation fins 61, which are configured to dissipate heat from the packing assembly 90. It should be understood that the annular heat dissipation fins 61 on the outside of the bracket 60 can reduce the upward heat transfer of the valve body 50, lower the temperature at the packing assembly 90, reduce the oxidation rate of the packing assembly 90, and increase its service life.

[0056] In some embodiments, the sealing butterfly valve is designed with a double eccentric structure, wherein the deviation between the center line of the valve stem 10 and the center line of the valve body 50 is the first eccentricity, and the deviation between the center line of the valve stem 10 and the center of the flow channel is the second eccentricity; the eccentric structural design reduces the friction between the butterfly plate 20 and the valve seat 30, thereby reducing the driving torque of the actuator 70.

[0057] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0058] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A sealing butterfly valve, characterized in that, include: Valve seat (30); The valve stem (10) has a first air passage (100) and a first air inlet (101) connected together, and an air inlet connector (103) is provided at the first air inlet (101). The butterfly plate (20) has a second air passage (200) and a second air outlet (202) that are connected together. The butterfly plate (20) is connected to the valve stem (10). The first air passage (100) is connected to the second air passage (200). The butterfly plate (20) includes a sealing surface (220). The butterfly plate (20) is sealed to the valve seat (30) through the sealing surface (220). The second air outlet (202) is located on the sealing surface (220).

2. The sealing butterfly valve according to claim 1, characterized in that, The butterfly plate (20) includes an assembly part (21) and a sealing part (22) connected to each other. The assembly part (21) has a shaft hole (210). The valve stem (10) passes through the shaft hole (210) and is connected to the assembly part (21). The valve seat (30) has an assembly hole (300). The sealing part (22) passes through the assembly hole (300). The sealing part (22) has a sealing surface (220) on the side facing the valve seat (30).

3. The sealing butterfly valve according to claim 2, characterized in that, The sealing butterfly valve further includes a connector (40), which passes through and connects the valve stem (10) and the butterfly plate (20). The connector (40) has a third air passage (400), a third air inlet (401) and a third air outlet (402). The third air inlet (401) is located in the first air passage (100) and is connected to the first air passage (100) and the third air passage (400) respectively. The third air outlet (402) is located in the second air passage (200) and is connected to the second air passage (200) and the third air passage (400) respectively.

4. The sealing butterfly valve according to claim 2, characterized in that, The valve stem (10) also has a first air outlet (102), which is located on the outer peripheral wall of the valve stem (10) and communicates with the first air passage (100). The butterfly plate (20) also has a second air inlet (201), which is opened on the inner wall of the shaft hole (210) and communicates with the second air passage (200). The first air outlet (102) is correspondingly arranged with the second air inlet (201) and communicates with each other.

5. The sealing butterfly valve according to claim 2, characterized in that, The sealing butterfly valve also includes a valve body (50), and the butterfly plate (20) and the valve seat (30) are both disposed within the valve body (50); The valve seat (30) includes a body portion (301) and a protrusion portion (302) connected to each other. The body portion (301) is detachably connected to the valve body (50). The body portion (301) has the mounting hole (300). The protrusion portion (302) is disposed on the side of the body portion (301) facing the sealing portion (22) and abuts against the sealing surface (220). The second air outlet (202) is located between the protrusion (302) and the assembly part (21).

6. The sealing butterfly valve according to claim 3, characterized in that, The connector (40) is assembled with the valve stem (10) and the butterfly plate (20) using a low-temperature cold assembly process to form an interference fit; And / or, the tail of the connector (40) is provided with a positioning block (410), and the assembly part (21) is provided with a positioning groove (211). The connector (40) is positioned and engaged with the positioning groove (211) through the positioning block (410).

7. The sealing butterfly valve according to claim 5, characterized in that, The number of second air outlets (202) is multiple, and the multiple second air outlets (202) are arranged in an array along the sealing trajectory of the sealing surface (220).

8. The sealing butterfly valve according to claim 5, characterized in that, The medium pressure inside the valve body (50) is less than the medium pressure inside the first air passage (100) and the second air passage (200).

9. The sealing butterfly valve according to claim 5, characterized in that, The sealing butterfly valve also includes a sealing ring (303), which is sleeved on the body part (301) and seals the body part (301) and the valve body (50).

10. The sealing butterfly valve according to claim 7, characterized in that, The second airway (200) includes a first channel (203), a second channel (204) and a third channel (205). The first channel (203), the second channel (204) and the third channel (205) are all located in the sealing part (22) and are interconnected with each other. The first channel (203) and the second channel (204) are arranged in a cross shape, and the third channel (205) is annular and located outside the first channel (203) and the second channel (204).

11. The sealing butterfly valve according to claim 1, characterized in that, The sealing butterfly valve also includes a valve body (50), the butterfly plate (20) and the valve stem (10) are rotatably disposed in the valve body (50), the valve body (50) is provided with a cleaning hole (501), and the butterfly plate (20) can rotate and switch between a first position and a second position under the drive of the valve stem (10). When the butterfly plate (20) is in the first position, the butterfly plate (20) is sealed to the valve seat (30) through the sealing surface (220); When the butterfly plate (20) is in the second position, the sealing surface (220) of the butterfly plate (20) is correspondingly provided with the cleaning hole (501), and the cleaning hole (501) is configured to connect to an external cleaning device so as to clean the sealing surface (220) by the external cleaning device.

12. The sealing butterfly valve according to any one of claims 1 to 11, characterized in that, The sealing butterfly valve further includes a bracket (60) and a valve body (50). The bracket (60) is connected above the valve body (50). The butterfly plate (20) and the valve stem (10) are rotatably disposed inside the valve body (50). An actuator (70) is provided on the bracket (60). The bracket (60) has a first hole (600). One end of the valve stem (10) passes through the first hole (600) and is connected to the actuator (70) for transmission. The other end passes through the valve body (50) and is connected to the butterfly plate (20). The sealing butterfly valve also includes a gland assembly (80) and a packing assembly (90). The packing assembly (90) is sleeved on the valve stem (10) and passes through the first hole (600). The gland assembly (80) is movably sleeved on the valve stem (10) and abuts against the packing assembly (90). The first air inlet (101) is located between the cap assembly (80) and the actuator (70).

13. The sealing butterfly valve according to claim 12, characterized in that, The valve body (50) is provided with a limiting block (51) for limiting the rotation angle of the butterfly plate (20).

14. The sealing butterfly valve according to claim 12, characterized in that, The support (60) is provided with heat dissipation fins (61), which are configured to dissipate heat from the packing assembly (90).

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