Valve seal structure and method for delivering high temperature, high pressure media

Abstract

The application belongs to the technical field of valve sealing, in particular to a valve sealing structure and method for conveying high-temperature and high-pressure medium, which comprises a valve body, a valve cover, a sealing ring, a four-ring, a supporting ring, a heat insulation ring and a slow-release pre-tightening part; the slow-release pre-tightening part is arranged between the supporting ring and the valve cover, and the supporting ring is fixed on the valve body; when the pressure in the valve body changes, the maximum rate of discharge and suction of the fluid in the adaptive groove is controlled by using the flow limiting valve, so that the maximum rate of the valve cover moving away from or close to the four-ring is controlled, and thus the pressurization or depressurization rate of the sealing ring is controlled, thereby reducing the damage of pressure change to the sealing ring, especially in the environment of severe and repeated pressure fluctuations, the pressure change of the sealing ring can be kept within a relatively safe range, and the heat insulation ring can block the temperature of the medium, delay the temperature change rate of the sealing ring, and prolong the service life of the sealing ring in the long-term use.

Description

Technical Field

[0001] This invention belongs to the field of valve sealing technology, specifically a valve sealing structure and method for conveying high-temperature and high-pressure media. Background Technology

[0002] The rapidly developing power plant industry has placed new demands on valve lifespan, primarily focusing on their temperature and pressure resistance. For valves operating under high temperature and pressure conditions, a self-sealing structure is crucial. Traditional sealing processes (such as those using PTFE or graphite rings) are prone to creep under high temperature and pressure media, leading to decreased packing seal performance and even rupture, potentially causing safety accidents.

[0003] In valve self-sealing structures, graphite rings are the core sealing components. Made from stamped graphite powder, they are highly susceptible to breakage and pulverization during use. As a seal for high-temperature, high-pressure media, graphite rings are subjected to prolonged periods of drastic pressure and temperature fluctuations: when temperature and pressure rise, the graphite ring deforms and expands, leading to a redistribution of compressive stress and accelerated material creep; when temperature and pressure drop, the graphite ring contracts and attempts elastic recovery, at which point micro-cracks easily develop internally. Over long periods of repeated temperature and pressure cycles, graphite rings are prone to problems such as lamellar peeling, pulverization, and decreased density, which not only shortens their service life but can also, in severe cases, cause seal failure and media leakage.

[0004] In related technologies, to enhance the sealing effect of valves under conditions of gradually increasing medium pressure and temperature parameters, a built-in bidirectional self-sealing high-temperature and high-pressure valve was previously disclosed (application number CN2025101826479). This solution addresses the increasing sealing requirements of valves by employing built-in self-sealing structures in both the valve cover and seat. When high-pressure medium is introduced, the seal is compressed, preventing safety issues caused by external or internal leakage of the medium, effectively improving the economic efficiency of unit operation, and increasing the overall stability, reliability, and safety of the valve. However, in practical applications, it has been found that during long-term use, fluctuations in pressure and temperature cause the graphite ring, acting as a sealing element, to creep and pulverize more rapidly during frequent deformation, reducing the service life of the sealing structure and hindering the maintenance of stable sealing performance over the long term.

[0005] In view of this, the present invention proposes a valve sealing structure and method for conveying high-temperature and high-pressure media, in order to solve the above-mentioned technical problems. Summary of the Invention

[0006] To overcome the shortcomings of existing technologies and solve the aforementioned technical problems, this invention proposes a valve sealing structure and method for conveying high-temperature and high-pressure media.

[0007] The technical solution adopted by the present invention to solve its technical problem is: a valve sealing structure for conveying high temperature and high pressure media, comprising a valve body, a valve cover, a sealing ring, a four-ring, a support ring, a heat insulation ring, and a slow-release pre-tightening component;

[0008] The valve body is provided with a sealing groove, and a four-ring is embedded in the side wall of the sealing groove;

[0009] The valve cover is slidably installed in the sealing groove. The valve cover has an inverted T-shaped structure, and the bottom end of the valve cover extends to below the four-ring.

[0010] Both the sealing ring and the heat insulation ring are installed between the four-way ring and the valve cover, with the heat insulation ring located between the sealing ring and the valve cover.

[0011] A support ring is fixedly installed at the opening of the sealing groove, and the support ring is connected to the valve cover by a slow-release pre-tightening component;

[0012] The slow-release pre-tightening component includes a pre-tightening plug, a connecting rod, and an elastic slow-release component;

[0013] The support ring is provided with an assembly hole, and the pre-tightening tube is detachably fixed on the support ring through the assembly hole. The pre-tightening tube extends into the sealing groove, and an adapter groove is provided at the bottom of the pre-tightening tube.

[0014] The valve cover is provided with a pre-tightening assembly groove, and a connecting rod is fixedly installed in the pre-tightening assembly groove. The connecting rod extends into the adapter groove. Both the connecting rod and the adapter groove are T-shaped structures, and the connecting rod and the pre-tightening plug are slidably limited and connected through the adapter groove.

[0015] The elastic slow-release element is installed in the adapter groove, and the elastic slow-release element elastically and slowly connects the connecting rod to the pre-tightening plug tube.

[0016] Preferably, the elastic release element includes an elastic element, a piston plate, and a flow limiting valve;

[0017] The elastic element is fixedly installed in the adapter groove, and a piston plate is fixedly installed at the bottom end of the elastic element. The piston plate is slidably and sealingly connected to the adapter groove, and the piston plate is fixedly connected to the connecting rod.

[0018] A flow-limiting valve is installed at the end of the adapter slot away from the connecting rod. The flow-limiting valve is used to control the flow rate of the fluid pumped out by the adapter slot.

[0019] Preferably, the valve cover has a buffer groove on the side away from the support ring, and an elastic diaphragm is fixedly installed at the opening of the buffer groove. The elastic diaphragm is made of a high-temperature resistant metal material.

[0020] Preferably, it also includes an active pre-tightening mechanism, which is installed on the valve cover and is used to temporarily pre-tighten the sealing ring. The active pre-tightening mechanism includes a telescopic control rod and an electric telescopic component.

[0021] An electric telescopic component is fixedly installed between the support ring and the valve cover. The electric telescopic component is used to actively adjust the distance between the valve cover and the support ring.

[0022] A telescopic control rod is fixedly installed inside the buffer groove. A driven plate is fixedly installed at the end of the telescopic control rod. The telescopic control rod contacts the elastic diaphragm through the driven plate. The telescopic control rod is electrically connected to the electric telescopic component.

[0023] Preferably, the telescopic control rod consists of a fixed plate, a sliding plate, and an insulating sleeve;

[0024] The fixed plate is fixedly installed on the valve cover, and the sliding plate is slidably installed on the fixed plate. Electrode plates are fixedly installed on the side of the sliding plate and the fixed plate that are close to each other, and the length of the electrode plates is half the length of the sliding plate and the fixed plate. The isolation sleeve is sleeved on the outside of the fixed plate and the sliding plate.

[0025] Preferably, the elastic diaphragm is covered with a heat insulation pad on the side facing the buffer groove.

[0026] Preferably, a one-way suction pipe and a one-way flushing pipe are fixedly installed on the valve cover. Both the one-way suction pipe and the one-way flushing pipe are connected to the buffer groove. The one-way suction pipe is connected to the inner cavity of the valve body. The one-way flushing pipe extends into the gap between the heat insulation ring and the valve cover.

[0027] Preferably, the bottom of the heat insulation ring is provided with a spiral groove, and the unidirectional flushing pipe extends into the spiral groove and is provided with an opening.

[0028] Preferably, a storage tank is fixedly installed on the support ring, the storage tank is filled with a fluid with high specific heat capacity, the storage tank is connected to a flow limiting valve through a circulation pipe, the middle of the circulation pipe extends into the inside of the valve cover, the part of the valve cover between the circulation pipe and the buffer groove is made of a high thermal conductivity material, and the storage tank is fixedly installed with uniformly distributed heat dissipation fins on the outside of the sealing groove.

[0029] A valve sealing method for conveying high-temperature and high-pressure media, the method using the above-mentioned valve sealing structure, the method comprising the following steps:

[0030] S1: When the high-temperature and high-pressure medium in the valve body begins to be transported, the gradually increasing pressure in the valve body causes the elastic diaphragm to deform, forcing the active pre-tightening mechanism to start.

[0031] S2: The active pre-tightening mechanism pre-shrinks the distance between the valve cover and the support ring, causing the sealing ring to slowly increase pressure and deform. At the same time, the medium pre-extracted in the buffer tank is discharged through the one-way flushing pipe.

[0032] S3: As the pressure inside the valve body continues to increase, the medium discharged through the one-way flushing pipe flows from the gap between the heat insulation ring and the valve cover toward the valve body cavity, preventing the high-temperature medium from directly contacting the heat insulation ring and the sealing ring, and slowing down the rate of temperature change of the sealing ring.

[0033] S4: The continuously increasing pressure actively drives the valve cover to move, further enhancing the sealing effect of the sealing ring deformation. At the same time, the contraction of the elastic slow-release element causes the high specific heat capacity fluid in the storage tank to flow in the circulation pipe, slowing down the heating rate of the medium in the slow-flow tank.

[0034] S5: When the pressure inside the valve body decreases or fluctuates, the elastic slow-release element slows down the rate of change of the distance between the valve cover and the support ring, thereby reducing the rate of pressure change on the sealing ring and reducing the negative impact of drastic changes in high temperature and high pressure environment on the life of the sealing ring.

[0035] The beneficial effects of this invention are as follows:

[0036] 1. The valve sealing structure and method for conveying high-temperature and high-pressure media as described in this invention, by setting a slow-release pre-tightening element between the support ring and the valve cover, and fixing the support ring to the valve body, when the internal pressure of the valve body changes, the flow limiting valve controls the maximum rate of discharge and suction of the fluid in the adaptation tank, thereby controlling the maximum rate at which the valve cover moves away from or towards the four-ring seal. This controls the rate of pressurization or depressurization of the sealing ring, thus reducing the damage to the sealing ring caused by pressure changes. Especially in environments with severe and fluctuating pressure, this ensures that the pressure change of the sealing ring remains within a relatively safe range. Combined with the heat insulation ring's ability to block the medium temperature, it slows down the rate of temperature change in the sealing ring. In long-term use, this effectively delays the rate of sealing ring failure and extends the service life of the sealing ring.

[0037] 2. The valve sealing structure and method for conveying high-temperature and high-pressure media described in this invention, by setting an active pre-tightening mechanism, actively pulls the valve cover to move when the pressure is insufficient to move the valve cover during the process of the medium changing from stopping to conveying. When the pressure changes drastically in the later stage, the sealing ring has already been compressed to a certain extent, thus making the pressure increase rate of the sealing ring further maintain a relatively stable value, and further delaying the impact of drastic pressure changes on the life of the sealing ring. Attached Figure Description

[0038] The invention will now be further described with reference to the accompanying drawings.

[0039] Figure 1 This is a perspective view of the present invention;

[0040] Figure 2 This is a cross-sectional view of the present invention;

[0041] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;

[0042] Figure 4 This is an assembly diagram of the support ring, pre-tightening bolt, and electric telescopic component;

[0043] Figure 5 This is a schematic diagram of the assembly of the valve cover and the connecting rod;

[0044] Figure 6 This is a cross-sectional view of the slow-release preload component;

[0045] Figure 7 This is a cross-sectional view of the valve cover;

[0046] Figure 8 yes Figure 7 A magnified view of a section at point B in the middle;

[0047] Figure 9 This is a sectional view of the telescopic control rod;

[0048] Figure 10 This is a flowchart of the method of the present invention;

[0049] In the diagram: 1. Valve body; 11. Valve cover; 12. Sealing ring; 13. Four-way ring; 14. Support ring; 15. Sealing groove; 16. Insulation ring; 2. Pre-tightening plug; 21. Adaptor groove; 22. Pre-tightening assembly groove; 23. Connecting rod; 24. Elastic element; 25. Piston plate; 26. Flow limiting valve; 27. Storage tank; 28. Circulation pipe; 29. ​​Heat sink; 3. Electric telescopic element; 31. Driven plate; 32. Fixed plate; 33. Sliding plate; 34. Isolation sleeve; 35. Electrode plate; 36. Insulation pad; 4. One-way suction pipe; 41. One-way flushing pipe; 42. Spiral groove; 5. Buffer groove; 51. Elastic diaphragm. Detailed Implementation

[0050] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0051] like Figures 1 to 10 As shown, the valve sealing structure for conveying high-temperature and high-pressure media according to the present invention includes a valve body 1, a valve cover 11, a sealing ring 12, a four-ring 13, a support ring 14, a heat insulation ring 16, and a slow-release pre-tightening component;

[0052] The valve body 1 is provided with a sealing groove 15, and a four-ring 13 is embedded in the side wall of the sealing groove 15. In this invention, the four-ring 13 serves as a limiting component and is embedded in the inner wall of the sealing groove 15. In order to facilitate disassembly and maintenance in the future, the four-ring 13 can be fixed to the sealing groove 15 by tightening bolts. The presence of the four-ring 13 will directly prevent the sealing ring 12 from moving upward.

[0053] The valve cover 11 is slidably installed in the sealing groove 15. The valve cover 11 is an inverted T-shaped structure. The bottom end of the valve cover 11 extends to the bottom of the four-ring 13. In this invention, the valve cover 11 serves as a pressure transmission component. Its bottom end extends into the inner cavity of the valve body 1 and is in direct contact with the high-temperature and high-pressure medium. When the pressure inside the valve body 1 changes, the pressure will directly act on the bottom surface of the valve cover 11 and push the valve cover 11 to move out of the inner cavity of the valve body 1. Since there is a gap between the valve cover 11 and the sealing groove 15, it is necessary to seal the gap.

[0054] Both the sealing ring 12 and the heat insulation ring 16 are installed between the four-way ring 13 and the valve cover 11, and the heat insulation ring 16 is located between the sealing ring 12 and the valve cover 11. The sealing ring 12 exists so that when the pressure inside the valve body 1 changes, the valve cover 11 transmits the pressure to the sealing ring 12, causing the sealing ring 12 to deform, thereby sealing the gap between the valve cover 11 and the sealing groove 15. The heat insulation ring 16 is used to prevent the high temperature and high pressure medium from directly contacting the sealing ring 12, thereby slowing down the heating rate of the sealing ring 12 and reducing phenomena such as cracks in the sealing ring 12 caused by drastic temperature changes.

[0055] A support ring 14 is fixedly installed at the opening of the sealing groove 15. The support ring 14 is connected to the valve cover 11 through a slow-release pre-tightening component. In this invention, the support ring 14 is fixedly installed outside the opening of the sealing groove 15 by bolts and forms an I-shaped structure with the valve cover 11. With the cooperation of the four-ring 13, it is stably installed in the sealing groove 15.

[0056] The slow-release pre-tightening component includes a pre-tightening plug 2, a connecting rod 23, and an elastic slow-release component;

[0057] The support ring 14 has an assembly hole, and the pre-tightening tube 2 is detachably fixed on the support ring 14 through the assembly hole. The pre-tightening tube 2 extends into the sealing groove 15. The bottom of the pre-tightening tube 2 has an adapter groove 21. In this invention, the installation depth of the pre-tightening tube 2 on the support ring 14 is adjustable. The connection method between the pre-tightening tube 2 and the assembly hole on the support ring 14 is preferably a threaded connection.

[0058] The valve cover 11 is provided with a pre-tightening assembly groove 22, and a connecting rod 23 is fixedly installed in the pre-tightening assembly groove 22. The connecting rod 23 extends into the adapter groove 21. Both the connecting rod 23 and the adapter groove 21 are T-shaped structures, and the connecting rod 23 and the pre-tightening tube 2 are slidably limited through the adapter groove 21. In this invention, the connecting rod 23 and the pre-tightening tube 2 can slide axially, but their axial sliding length is limited. When the sealing structure is installed, the connecting rod 23 is installed in the pre-tightening assembly groove 22. By adjusting the pre-tightening tube 2, the length of the pre-tightening tube 2 extending below the support ring 14 is changed. With the sliding limit connection between the pre-tightening tube 2 and the connecting rod 23, the valve cover 11 moves towards the support ring 14, thereby applying pre-tightening pressure to the sealing ring 12.

[0059] The elastic slow-release element is installed in the adapter groove 21, and the elastic slow-release element connects the connecting rod 23 to the pre-tightening tube 2 in an elastic slow-release connection.

[0060] The elastic slow-release component includes an elastic element 24, a piston plate 25, and a flow limiting valve 26;

[0061] The elastic element 24 is fixedly installed in the adapter groove 21, and a piston plate 25 is fixedly installed at the bottom end of the elastic element 24. The piston plate 25 is slidably and sealingly connected to the adapter groove 21, and the piston plate 25 is fixedly connected to the connecting rod 23.

[0062] A flow limiting valve 26 is installed at the end of the adapter slot 21 away from the connecting rod 23. The flow limiting valve 26 is used to control the flow rate of the fluid pumped out by the adapter slot 21.

[0063] In order to reduce the damage rate of the sealing ring 12 caused by pressure and temperature fluctuations and extend its service life when the sealing ring 12 is used in a high temperature and high pressure environment for a long time, this invention improves the valve sealing structure. When transporting high temperature and high pressure media, the rate of pressure and temperature change of the sealing ring 12 is slowed down, thereby reducing the probability of damage to the sealing ring 12. In the long-term use, the rate of layer peeling and decomposition of the sealing ring 12 is slowed down.

[0064] Specifically, during the transportation of high-temperature and high-pressure media, as the pressure inside the valve body 1 gradually increases, the pressure forces the valve cover 11 to move away from the valve body 1's inner cavity. With the cooperation of the four-ring 13, the valve cover 11 continuously applies pressure to the heat insulation ring 16 and the sealing ring 12, causing the pressure on the sealing ring 12 to continuously increase from the initial pre-tightening pressure. Under the action of pressure, the sealing ring 12 deforms, gradually enhancing the sealing effect of the sealing ring 12 on the gap between the valve cover 11 and the sealing groove 15. During this process, when the valve cover 11 pushes... When the connecting rod 23 moves toward the support ring 14, it pushes the piston plate 25 to move within the adapter groove 21. This movement of the piston plate 25 causes the elastic element 24 to gradually compress, accumulating elastic force. This allows the connecting rod 23 and valve cover 11 to reset by releasing the elastic force when the pressure inside the valve body 1 decreases. Furthermore, the movement of the piston plate 25 causes the chamber space at the end of the adapter groove 21 connected to the flow-limiting valve 26 to gradually decrease, thereby forcing the space initially present in the adapter groove 21 to... Fluid is discharged outward through the flow-limiting valve 26. The presence of the flow-limiting valve 26 controls the fluid discharge rate in the adapter groove 21. In other words, the maximum movement rate of the piston plate 25 and the connecting rod 23 is controlled under the presence of the flow-limiting valve 26. Therefore, when the pressure inside the valve body 1 rises rapidly, the presence of the slow-release pre-tightening element can control the maximum increase rate of pressure applied by the valve cover 11 to the sealing ring 12, keeping the pressure increase rate of the sealing ring 12 within a safe range. Similarly, when the pressure inside the valve body 1 decreases, as the elastic element 24 releases the accumulated elastic force, the valve cover 11 tends to reset. During this process, due to the presence of the flow-limiting valve 26, the maximum rate at which the fluid enters the adapter groove 21 is controlled, thus controlling the maximum rate at which the connecting rod 23 and the valve cover 11 move away from the support ring 14. Therefore, the rate at which the pressure decreases on the sealing ring 12 is within a safe range, thereby delaying the failure rate of the sealing ring 12 during long-term use, especially when there are relatively severe and repeated pressure fluctuations during media transportation.

[0065] This invention provides a slow-release pre-tightening element between the support ring 14 and the valve cover 11, and fixes the support ring 14 to the valve body 1. When the pressure inside the valve body 1 changes, the flow limiting valve 26 controls the maximum rate of fluid discharge and suction in the adapter groove 21, thereby controlling the maximum rate at which the valve cover 11 moves away from or closer to the four-ring 13. This controls the pressurization or depressurization rate of the sealing ring 12, thereby reducing the damage to the sealing ring 12 caused by pressure changes. Especially in environments with severe and fluctuating pressure, this invention keeps the pressure change of the sealing ring 12 within a relatively safe range. Combined with the heat insulation ring 16 blocking the temperature of the medium, it slows down the rate of temperature change of the sealing ring 12. In long-term use, this invention can effectively slow down the failure rate of the sealing ring 12 and extend its service life.

[0066] In a preferred embodiment of the present invention, a buffer groove 5 is provided on the side of the valve cover 11 away from the support ring 14, and an elastic diaphragm 51 is fixedly installed at the opening of the buffer groove 5. The elastic diaphragm 51 is made of high temperature resistant metal material.

[0067] In environments with drastic pressure changes, to further mitigate the effects of these pressure variations, a buffer groove 5 is provided on the valve cover 11 away from the upper part of the valve body 1. An elastic diaphragm 51 is installed inside the buffer groove 5. When the pressure inside the valve body 1 increases, the increased pressure forces the elastic diaphragm 51 to contract into the buffer groove 5, thereby increasing the internal space of the valve body 1 and slowing down the rate of pressure increase in the valve body 1. Conversely, when the pressure inside the valve body 1 drops rapidly, the elastic diaphragm 51 gradually returns to its flat state, causing the internal space of the valve body 1 to decrease, thereby slowing down the rate of pressure decrease in the valve body 1. Combined with the slow-release pre-tightening component, this further ensures that the pressure change rate of the sealing ring 12 is within a safe range.

[0068] As a preferred embodiment of the present invention, it further includes an active pre-tightening mechanism, which is installed on the valve cover 11. The active pre-tightening mechanism is used to temporarily pre-tighten the sealing ring 12. The active pre-tightening mechanism includes a telescopic control rod and an electric telescopic component 3.

[0069] An electric telescopic component 3 is fixedly installed between the support ring 14 and the valve cover 11. The electric telescopic component 3 is used to actively adjust the distance between the valve cover 11 and the support ring 14. In this invention, the electric telescopic component 3 is preferably an electric telescopic rod without a self-locking function. When the telescopic control rod circuit is turned on, the electric telescopic component 3 retracts at a constant rate under the control of a pre-set program. When the retraction time reaches a pre-set value, the electric telescopic component 3 stops running. At this time, when the valve cover 11 moves actively, the electric telescopic component 3 extends and retracts adaptively.

[0070] A telescopic control rod is fixedly installed inside the buffer groove 5. A driven plate 31 is fixedly installed at the end of the telescopic control rod. The telescopic control rod contacts the elastic diaphragm 51 through the driven plate 31. The telescopic control rod is electrically connected to the electric telescopic component 3.

[0071] The telescopic control rod consists of a fixed plate 32, a sliding plate 33, and an isolation sleeve 34;

[0072] The fixed plate 32 is fixedly installed on the valve cover 11, and the sliding plate 33 is slidably installed on the fixed plate 32. Electrode plates 35 are fixedly installed on the side of the sliding plate 33 and the fixed plate 32 that are close to each other, and the length of the electrode plates 35 is half the length of the sliding plate 33 and the fixed plate 32. The isolation sleeve 34 is sleeved on the outside of the fixed plate 32 and the sliding plate 33.

[0073] The elastic diaphragm 51 is covered with a heat insulation pad 36 on the side facing the buffer groove 5.

[0074] To further control the pressurization and depressurization rates of the sealing ring 12, an active pre-tightening mechanism is provided in this invention. When the pressure inside the valve body 1 initially changes, the elastic diaphragm 51 deforms towards the buffer groove 5. After being driven by the driven plate 31 and the isolation sleeve 34, it forces the sliding plate 33 to slide on the fixed plate 32, causing the sliding plate 33 to come into contact with the electrode plates 35 on the fixed plate 32, which were initially misaligned. At this time, the electric telescopic component 3 retracts at a fixed rate, thereby pulling the valve cover 11 towards the support ring 14. This mechanism is effective when the pressure change is slow in the initial stage of medium transport. The valve cover 11 is actively pulled to compress the sealing ring 12. At this time, the movement speed of the valve cover 11 is greater than the movement speed of the valve cover 11 forced by the pressure. On the one hand, this increases the internal space of the valve body 1, providing a buffer for the subsequent rapid pressure rise stage. On the other hand, through active pre-tightening, when the subsequent pressure change is more drastic, the sealing ring 12 has already undergone a certain degree of deformation. In the process of the sealing ring 12 finally reaching its maximum deformation, the deformation rate of the sealing ring 12 is evenly distributed throughout the entire process of pressure change in the valve body 1, thereby delaying the failure rate of the sealing ring 12.

[0075] This invention incorporates an active pre-tightening mechanism. When the medium transitions from a standstill to a conveying process, and the initial pressure is insufficient to move the valve cover 11, the mechanism actively pulls the valve cover 11 to move. Later, when the pressure changes drastically, the sealing ring 12 is compressed to a certain extent. This further maintains the pressure increase rate of the sealing ring 12 at a relatively stable value, thus further delaying the impact of drastic pressure changes on the lifespan of the sealing ring 12.

[0076] In a preferred embodiment of the present invention, a one-way suction pipe 4 and a one-way flushing pipe 41 are fixedly installed on the valve cover 11. Both the one-way suction pipe 4 and the one-way flushing pipe 41 are connected to the buffer groove 5. The one-way suction pipe 4 is connected to the inner cavity of the valve body 1. The one-way flushing pipe 41 extends into the gap between the heat insulation ring 16 and the valve cover 11.

[0077] The bottom of the heat insulation ring 16 is provided with a spiral groove 42, and the one-way flushing pipe 41 extends into the spiral groove 42 and is set with an opening.

[0078] A storage tank 27 is fixedly installed on the support ring 14. The storage tank 27 is filled with a fluid with high specific heat capacity. The storage tank 27 is connected to the flow limiting valve 26 through a circulation pipe 28. The middle part of the circulation pipe 28 extends into the valve cover 11. The part of the valve cover 11 between the circulation pipe 28 and the buffer groove 5 is made of a high thermal conductivity material. The storage tank 27 is fixedly installed with uniformly distributed heat sinks 29 on the outside of the sealing groove 15.

[0079] In practical applications, as the pressure inside the valve body 1 gradually increases, the pre-extracted transport medium in the sealing groove is discharged into the spiral groove 42 through the one-way flushing pipe 41. Since the spiral groove 42 at the bottom of the heat insulation ring 16 is only connected to the outer edge of the heat insulation ring 16, the transport medium is pushed into the gap between the valve cover 11 and the sealing groove 15 after being connected through the spiral groove 42. This blocks the transport medium in the inner cavity of the valve body 1, reducing the rate at which the high-temperature transport medium in the valve body 1 transfers temperature to the sealing ring 12. At the end of the transport phase, as the pressure inside the valve body 1 gradually decreases and the elastic diaphragm 51 resets, the one-way suction pipe 4... The transport medium in valve body 1 is drawn into buffer tank 5 for future use. During this process, when valve cover 11 moves, forcing the slow-release pre-tightening component to move, the high specific heat capacity medium flows back and forth in circulation pipe 28. Under the heat conduction of the high thermal conductivity material in valve cover 11, heat conduction occurs between the transport medium in buffer tank 5 and the high specific heat capacity medium in storage tank 27. With the help of heat sink 29 to dissipate heat from the high specific heat capacity medium in storage tank 27, heat dissipation is achieved for the transport medium in buffer tank 5. As a result, the temperature of the transport medium in buffer tank 5 is lower than the temperature of the transport medium flowing in valve body 1, thereby slowing down the heating rate of sealing ring 12.

[0080] A valve sealing method for conveying high-temperature and high-pressure media, the method using the above-mentioned valve sealing structure, the method comprising the following steps:

[0081] S1: When the high temperature and high pressure medium in the valve body 1 begins to be transported, the gradually increasing pressure in the valve body 1 causes the elastic diaphragm 51 to deform, forcing the active pre-tightening mechanism to start.

[0082] S2: The active pre-tightening mechanism pre-shrinks the distance between the valve cover 11 and the support ring 14, causing the sealing ring 12 to slowly increase pressure and deform. At the same time, the medium pre-extracted in the buffer tank 5 is discharged through the one-way flushing pipe 41.

[0083] S3: As the pressure inside the valve body 1 continues to increase, the medium discharged from the one-way flushing pipe 41 flows from the gap between the heat insulation ring 16 and the valve cover 11 toward the inner cavity of the valve body 1, preventing the high-temperature medium from directly contacting the heat insulation ring 16 and the sealing ring 12, and slowing down the rate of temperature change of the sealing ring 12.

[0084] S4: The continuously increasing pressure actively drives the valve cover 11 to move, further enhancing the sealing effect of the sealing ring 12. At the same time, the contraction of the elastic slow-release element causes the high specific heat capacity fluid in the storage tank 27 to flow in the circulation pipe 28, slowing down the heating rate of the medium in the slow-flow tank 5.

[0085] S5: When the pressure inside the valve body 1 decreases or fluctuates, the elastic slow-release element slows down the rate of change of the distance between the valve cover 11 and the support ring 14, which slows down the rate of pressure change of the sealing ring 12, reducing the negative impact of the drastically changing high temperature and high pressure environment on the life of the sealing ring 12.

[0086] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A valve sealing structure for conveying high-temperature and high-pressure media, characterized in that, It includes a valve body (1), a valve cover (11), a sealing ring (12), a four-ring (13), a support ring (14), a heat insulation ring (16), and a slow-release pre-tightening component; A sealing groove (15) is provided on the valve body (1), and a four-ring (13) is inlaid on the side wall of the sealing groove (15). The valve cover (11) is slidably installed in the sealing groove (15). The valve cover (11) is an inverted T-shaped structure. The bottom end of the valve cover (11) extends to below the four-ring (13). The sealing ring (12) and the heat insulation ring (16) are both installed between the four-way ring (13) and the valve cover (11), and the heat insulation ring (16) is located between the sealing ring (12) and the valve cover (11); A support ring (14) is fixedly installed at the opening of the sealing groove (15), and the support ring (14) is connected to the valve cover (11) by a slow-release pre-tightening component; The slow-release pre-tightening component includes a pre-tightening plug (2), a connecting rod (23), and an elastic slow-release component; The support ring (14) has an assembly hole, and the pre-tightening tube (2) is detachably fixed on the support ring (14) through the assembly hole. The pre-tightening tube (2) extends into the sealing groove (15), and the bottom of the pre-tightening tube (2) has an adapter groove (21). The valve cover (11) is provided with a pre-tightening assembly groove (22), and a connecting rod (23) is fixedly installed in the pre-tightening assembly groove (22). The connecting rod (23) extends into the adapter groove (21). Both the connecting rod (23) and the adapter groove (21) are T-shaped structures, and the connecting rod (23) and the pre-tightening plug (2) are slidably limited and connected through the adapter groove (21). The elastic release element is installed in the adapter slot (21), and the elastic release element elastically releases the connecting rod (23) to the pre-tightening tube (2).

2. The valve sealing structure for conveying high-temperature and high-pressure media according to claim 1, characterized in that: The elastic slow-release component includes an elastic element (24), a piston plate (25), and a flow limiting valve (26). The elastic element (24) is fixedly installed in the adapter groove (21), and a piston plate (25) is fixedly installed at the bottom end of the elastic element (24). The piston plate (25) is slidably sealed to the adapter groove (21), and the piston plate (25) is fixedly connected to the connecting rod (23). A flow limiting valve (26) is installed at the end of the adapter slot (21) away from the connecting rod (23). The flow limiting valve (26) is used to control the flow rate of the fluid pumped out by the adapter slot (21).

3. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 2, characterized in that: The valve cover (11) has a buffer groove (5) on the side away from the support ring (14). An elastic diaphragm (51) is fixedly installed at the opening of the buffer groove (5). The elastic diaphragm (51) is made of high-temperature resistant metal material.

4. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 3, characterized in that: It also includes an active pre-tightening mechanism, which is installed on the valve cover (11). The active pre-tightening mechanism is used to temporarily pre-tighten the sealing ring (12). The active pre-tightening mechanism includes a telescopic control rod and an electric telescopic component (3). An electric telescopic component (3) is fixedly installed between the support ring (14) and the valve cover (11). The electric telescopic component (3) is used to actively adjust the distance between the valve cover (11) and the support ring (14). A telescopic control rod is fixedly installed in the buffer groove (5). A driven plate (31) is fixedly installed at the end of the telescopic control rod. The telescopic control rod contacts the elastic diaphragm (51) through the driven plate (31). The telescopic control rod is electrically connected to the electric telescopic component (3).

5. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 4, characterized in that: The telescopic control rod consists of a fixed plate (32), a sliding plate (33), and an isolation sleeve (34); The fixed plate (32) is fixedly installed on the valve cover (11), and the sliding plate (33) is slidably installed on the fixed plate (32). Electrode plates (35) are fixedly installed on the side of the sliding plate (33) and the fixed plate (32) that are close to each other. The length of the electrode plates (35) is half the length of the sliding plate (33) and the fixed plate (32). The isolation sleeve (34) is sleeved on the outside of the fixed plate (32) and the sliding plate (33).

6. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 5, characterized in that: The elastic diaphragm (51) is covered with a heat insulation pad (36) on the side facing the buffer groove (5).

7. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 3 or 6, characterized in that: A one-way suction pipe (4) and a one-way flushing pipe (41) are fixedly installed on the valve cover (11). The one-way suction pipe (4) and the one-way flushing pipe (41) are both connected to the buffer groove (5). The one-way suction pipe (4) is connected to the inner cavity of the valve body (1). The one-way flushing pipe (41) extends into the gap between the heat insulation ring (16) and the valve cover (11).

8. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 7, characterized in that: The bottom of the heat insulation ring (16) is provided with a spiral groove (42), and the one-way flushing pipe (41) extends into the spiral groove (42) and is set with an opening.

9. A valve sealing structure for conveying high-temperature and high-pressure media according to claim 8, characterized in that: A storage tank (27) is fixedly installed on the support ring (14). The storage tank (27) is filled with a fluid with high specific heat capacity. The storage tank (27) is connected to the flow limiting valve (26) through a circulation pipe (28). The middle part of the circulation pipe (28) extends into the valve cover (11). The part of the valve cover (11) between the circulation pipe (28) and the buffer groove (5) is made of a high thermal conductivity material. The storage tank (27) is fixedly installed with uniformly distributed heat sinks (29) on the outside of the sealing groove (15).

10. A valve sealing method for conveying high-temperature and high-pressure media, characterized in that: This method uses the valve sealing structure of claim 9, and the method includes the following steps: S1: When the high temperature and high pressure medium inside the valve body (1) begins to be transported, the gradually increasing pressure inside the valve body (1) causes the elastic diaphragm (51) to deform, forcing the active pre-tightening mechanism to start. S2: The active pre-tightening mechanism pre-shrinks the gap between the valve cover (11) and the support ring (14), causing the sealing ring (12) to slowly increase pressure and deform. At the same time, the medium pre-extracted in the buffer tank (5) is discharged through the one-way flushing pipe (41). S3: As the pressure inside the valve body (1) continues to increase, the medium discharged by the one-way flushing pipe (41) flows from the gap between the heat insulation ring (16) and the valve cover (11) towards the inner cavity of the valve body (1), preventing the high-temperature medium from directly contacting the heat insulation ring (16) and the sealing ring (12), and slowing down the rate of temperature change of the sealing ring (12). S4: The continuously increasing pressure actively pushes the valve cover (11) to move, further enhancing the sealing effect of the sealing ring (12) deformation. At the same time, the contraction of the elastic slow-release component causes the high specific heat capacity fluid in the storage tank (27) to flow in the circulation pipe (28), delaying the heating rate of the medium in the slow-flow groove (5). S5: When the pressure inside the valve body (1) decreases or fluctuates, the elastic slow-release element slows down the rate of change of the distance between the valve cover (11) and the support ring (14), causing the sealing ring (12) to be subjected to a slower rate of pressure change, reducing the negative impact of the drastically changing high temperature and high pressure environment on the life of the sealing ring (12).

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