High-temperature and high-pressure valve combined sealing structure and valve

Abstract

A hand wheel is fixedly installed at the top of a screw, a valve cavity is formed in an inner cavity of a valve body, a lifting opening and closing valve element is installed in the valve cavity, a liquid supply cavity is formed in the lower portion of the valve cavity, a valve element anastomosis shell is arranged on the outer side of the liquid supply cavity, and a pressure-resistant sealing cavity is formed in the upper portion of the valve cavity. A pressure-resistant sealing piece arranged on the outer wall of the screw in a sleeving mode is arranged in the middle of the valve deck, a liquid inlet cavity communicated with the liquid supply cavity through a liquid supply channel is formed in the liquid inlet pipe, a liquid outlet cavity communicated with the valve cavity and the liquid supply cavity is formed in the liquid outlet pipe, and a combined sealing block is arranged at the top of the lifting opening and closing valve element. A bottom sealing groove matched with the top of the combined sealing block is formed in the inner wall of the valve body at the top of the valve cavity; scouring and abrasion of media to the valve element are reduced, the acting time of the valve body is long, and the overall service life of a product is prolonged in cooperation with external reinforcing connecting ribs and cooling fin structures.

Description

Technical Field

[0001] The present invention relates to the field of valves, and particularly to a combined sealing structure for high-temperature and high-pressure valves and a valve. Background Art

[0002] High-temperature and high-pressure valves are control devices designed specifically for extreme working conditions and can operate stably in environments where the temperature is higher than 450°C and the pressure reaches 10 - 80 MPa. Traditional high-temperature and high-pressure valves have certain defects during use, which are mainly reflected in: Firstly, after casting, the finished products are prone to sand holes or cracks in the curved neck part of the valve body in high-temperature and high-pressure environments, resulting in medium leakage during long-term use. A typical manifestation is that the surface of the casting turns blue and oxidizes, and some valves fail within less than two months of continuous operation. Secondly, transverse cracks, circumferential cracks, and longitudinal cracks occur in the valve body, causing metal fatigue fracture due to the superposition of thermal stress fluctuations and high-pressure impact loads. Thirdly, in high-temperature and high-pressure environments, the hard alloy layer of the valve core wears and cracks due to temperature fluctuations and medium erosion, and the corrosion depth of the sealing surface can be high. The overall traditional process overly relies on the sealing element, and when the sealing element ages, the valve body fails. Additionally, some valves also have serious problems with thermal deformation leakage. The difference in the thermal expansion coefficients of the valve body materials under high-temperature conditions causes structural deformation, resulting in an increase in the medium leakage rate due to the failure of metal hard seals. The leakage points are commonly found at the flange joint surface and the stuffing box.

[0003] Therefore, the existing high-temperature and high-pressure valves have defects such as low strength, poor high-temperature and high-pressure resistance, short service life, easy leakage, poor heat dissipation and pressure resistance, and low firmness. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a combined sealing structure for high-temperature and high-pressure valves and a valve with a simple structure, convenient operation, high working and operating efficiency, high strength, strong high-temperature and high-pressure resistance, obvious heat dissipation and pressure resistance effects, long service life, mechanical transmission of the valve core to avoid leakage caused by valve core wear, strong thermal deformation resistance, and obvious sealing effect, so as to overcome the defects in the prior art.

[0005] The technical solution of the present invention is realized as follows: A combined sealing structure for high-temperature and high-pressure valves includes a screw rod. A lifting and opening / closing valve core is installed at the bottom of the screw rod. The bottom of the lifting and opening / closing valve core is matched with a liquid supply cavity. A valve core fitting shell with an inner diameter matching the outer diameter of the lifting and opening / closing valve core is arranged outside the liquid supply cavity, and a liquid supply channel communicating with the liquid supply cavity is opened on the valve core fitting shell.

[0006] A valve with a combined high-temperature and high-pressure valve sealing structure, comprising a valve body, a liquid inlet pipe, a liquid outlet pipe, a valve seat, a valve cover and a valve stem arranged on the valve body. A threaded support seat is fixedly installed at the top of the valve stem, a screw rod is installed in the threaded support seat and the valve stem, a hand wheel is fixedly installed at the top of the screw rod, a valve cavity is arranged in the valve body cavity, a lifting and opening / closing valve core is installed in the valve cavity, a liquid supply cavity is arranged at the lower part of the valve cavity, a valve core fitting shell is arranged outside the liquid supply cavity, a pressure-resistant sealing cavity is arranged at the upper part of the valve cavity, a pressure-resistant sealing member sleeving the outer wall of the screw rod is arranged in the middle of the valve cover, a liquid inlet cavity communicating with the liquid supply cavity through a liquid supply channel is arranged in the liquid inlet pipe, a liquid outlet cavity communicating with the valve cavity and the liquid supply cavity is arranged in the liquid outlet pipe, a combined sealing block is arranged at the top of the lifting and opening / closing valve core, and a bottom sealing groove matching the top of the combined sealing block is opened on the inner wall of the valve body at the top of the valve cavity.

[0007] Further, the lifting and opening / closing valve core is a conical structure with an arc-shaped bottom, the shape of the liquid supply cavity matches the shape of the lifting and opening / closing valve core, the inner wall of the valve core fitting shell matches the outer wall of the lifting and opening / closing valve core, and a top sealing groove matching the bottom of the combined sealing block is arranged at the top of the valve core fitting shell.

[0008] Further, the lifting and opening / closing valve core is a columnar structure with a trapezoidal longitudinal section, the inner wall of the valve core fitting shell matches the outer wall of the lifting and opening / closing valve core, and the side of the lifting and opening / closing valve core facing the liquid supply channel is a vertical plane structure.

[0009] Further, the inner diameter of the valve cavity matches the outer diameter of the combined sealing block, and the inner diameter of the bottom sealing groove matches the outer diameter of the combined sealing block.

[0010] Further, the valve stem and the valve cover are an integral structure, a screw rod installation cavity communicating with each other is arranged in the valve stem and the valve cover, the middle part of the screw rod is sleeved in the screw rod installation cavity, an external thread layer is opened above the middle part of the screw rod, a threaded connection hole communicating with the screw rod installation cavity is arranged at the center position of the threaded support seat, an internal thread layer matching the external thread layer is arranged in the threaded connection hole, and the pressure-resistant sealing member is arranged on the inner wall of the screw rod installation cavity below the valve cover.

[0011] Further, the pressure-resistant sealing cavity is arranged on the inner walls of the valve seat and the valve cover, and the bottom of the lifting and opening / closing valve core is connected to the bottom of the screw rod through a rotating connecting piece.

[0012] Further, strengthening connecting ribs are arranged between the outer wall of the valve cavity and the outer wall of the liquid inlet pipe and between the outer wall of the liquid supply cavity and the outer wall of the liquid outlet pipe, and heat dissipation fins are arranged on the strengthening connecting ribs.

[0013] Further, the valve core fitting shell and the outer wall of the valve cavity are an integral structure, the inner diameter of the top sealing groove matches the outer diameter of the combined sealing block, and the included angle between the inner wall of the valve core fitting shell and the axis of the valve cavity is an acute angle.

[0014] Furthermore, the inner wall on one side of the valve core fitting shell where the liquid supply channel is opened is parallel to the axis of the valve cavity, and the included angle between the inner wall on the other side of the valve core fitting shell and the axis of the valve cavity is an acute angle.

[0015] The present invention has the following positive effects: 1. The present invention provides a combined sealing structure for high-temperature and high-pressure valves. A combined seal is achieved by the mutual sealing of the lifting and opening / closing valve core and the liquid supply channel on the valve core fitting shell. The opening and closing of the liquid supply channel are realized through the lifting operation of the lifting and opening / closing valve core. The liquid supply channel is opened on the valve core fitting shell, and its opening conforms to the outer wall shape of the lifting and opening / closing valve core. Liquid inlet or liquid blocking is achieved by vertical or inclined opening. The valve core fitting shell adopts a conical cavity structure with an arc-shaped bottom or a special-shaped structure that cooperates with the outer wall of the lifting and opening / closing valve core on one side, and is designed according to the output of different media and the required pressure-bearing requirements. During the implementation of high-temperature and high-pressure operations, the mechanical transmission of liquid medium transportation or blocking can be realized through the vertical movement of the lifting and opening / closing valve core. The overall compressive capacity is strong. By adopting the mechanical transmission method of screw rotation, the stop flow and opening / closing circulation of high-pressure medium in the valve body are realized. The overall structure adopts an independent liquid supply cavity, reducing the influence of high temperature and high pressure on the main cavity of the valve body, improving the sealing effect, and at the same time extending the service life of the components.

[0016] 2. The present invention provides a valve with a combined sealing structure for high-temperature and high-pressure valves. The valve body is integrally formed by casting and is provided with reinforcing connecting ribs and heat dissipation fins. After casting, the finished product has high strength in a high-temperature and high-pressure environment, and the firmness of the curved neck part of the valve body is high. There will be no medium leakage during long-term use in a special high-temperature and high-pressure environment. The valve body realizes the buffered output of high-pressure medium through multiple internal cavities, reducing the thermal stress fluctuation and metal fatigue fracture of the high-pressure impact assembly. Through the buffering effect of the liquid inlet cavity, liquid supply channel, liquid supply cavity, valve cavity, and liquid outlet cavity in the valve body, combined with the unique design of the compressive sealing cavity, after the lifting and opening / closing valve core is fully opened, its top seals the compressive sealing cavity, and the screw sealing part is sealed by mechanical sealing to avoid liquid leakage, forming an independent compressive cavity to avoid the impact on the inner cavity of the valve caused by the high-pressure medium when it exits the liquid. The sealing position is effectively protected. At the same time, combined with the unique structural design of the lifting and opening / closing valve core, the medium output from the liquid supply channel is buffered and drained and then transported to the valve cavity and then output from the liquid outlet cavity, reducing the erosion and wear of the medium on the valve core. The service time of the valve body is long. Combined with the external reinforcing connecting ribs and heat dissipation fin structure, the overall service life of the product is enhanced.

[0017] 3. The lifting and opening / closing valve core of the present invention adopts a unique design mechanism. An opening / closing sealing working surface is formed between its outer wall and the cooperating liquid supply chamber and the inner wall of the valve core fitting shell. Two forms of valve core actions, namely vertical opening / closing sealing and arc-shaped opening / closing sealing, are adopted, which are suitable for different media and scenarios. Through the valve core fitting shell, high-strength high-pressure medium buffering operation is implemented. When the medium passes through the liquid supply channel, the buffer and slow flow operation is then implemented by using the uniquely designed lifting and opening / closing valve core, and then the high-pressure medium is introduced into the main valve chamber and finally discharged through the liquid outlet pipe, achieving the anti-pressure buffering - buffer and slow flow - liquid distribution - liquid outlet of the high-pressure medium. It avoids the valve body cracking or leakage caused by adverse factors such as high-pressure impact and excessive erosion of the valve body. Cooperating with the independent anti-pressure sealing chamber structure design after closing, it realizes the high tightness, high anti-pressure property and high anti-temperature property of the valve under special working conditions.

[0018] 4. The present invention adopts a mechanical opening / closing method, cooperates with multi-chamber liquid distribution, and integrates external strengthening design. It can not only perform heat dissipation treatment on the valve body under high-temperature environment to avoid the occurrence of heat deformation and leakage problems, but also improve the anti-pressure, anti-impact and anti-erosion capabilities. The overall service life is long. The joint and sealing parts of the valve implement an independent sealing structure, which is superior to the high-temperature and high-pressure valves in the market and has good social and economic benefits. Brief Description of the Drawings

[0019] Figure 1 It is one of the external structure schematic diagrams of the valve with a combined sealing structure for high-temperature and high-pressure valves.

[0020] Figure 2 For the present invention Figure 1 One of the internal structure schematic diagrams.

[0021] Figure 3 For the present invention Figure 1 Two of the internal structure schematic diagrams.

[0022] Figure 4 For the present invention Figure 1 Three of the internal structure schematic diagrams.

[0023] Figure 5 It is two of the external structure schematic diagrams of the valve with a combined sealing structure for high-temperature and high-pressure valves.

[0024] Figure 6 For the present invention Figure 2 One of the internal structure schematic diagrams.

[0025] Figure 7 For the present invention Figure 2 Two of the internal structure schematic diagrams.

[0026] Figure 8 For the present invention Figure 2 Three of the internal structure schematic diagrams. Detailed implementation mode

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] In the following description of the invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. The term "connection" only represents the connection between devices and has no special meaning.

[0029] Embodiment 1, as Figure 1 , 2 , 3, 4 show, a high-temperature and high-pressure valve combined sealing structure, including a screw rod 10, the bottom of the screw rod 10 is provided with a lifting and opening and closing valve core 17, the bottom of the lifting and opening and closing valve core 17 is matched with a liquid supply cavity 19, the outer side of the liquid supply cavity 19 is provided with a valve core fitting shell 24 with an inner diameter matching the outer diameter of the lifting and opening and closing valve core 17, and a liquid supply channel 16 communicating with the liquid supply cavity 19 is opened on the valve core fitting shell 24.

[0030] In this embodiment, the above valve combined sealing structure is used to make a valve. The valve is provided with a high-temperature and high-pressure valve combined sealing structure, including a valve body 1, a liquid inlet pipe 2, a liquid outlet pipe 3, a valve seat 4, a valve cover 5 and a valve rod 6 arranged on the valve body 1. The top of the valve rod 6 is fixedly provided with a threaded support seat 7. The screw rod 10 is installed in the threaded support seat 7 and the valve rod 6. A hand wheel 8 is fixedly installed at the top of the screw rod 10. A valve cavity 15 is arranged in the valve body 1 cavity. The lifting and opening and closing valve core 17 is installed in the valve cavity 15. The liquid supply cavity 19 is arranged at the lower part of the valve cavity 15. The valve core fitting shell 24 is arranged on the outer side of the liquid supply cavity 19. An anti-pressure sealing cavity 23 is arranged at the upper part of the valve cavity 15. The middle of the valve cover 5 is provided with an anti-pressure sealing member 11 sleeved on the outer wall of the screw rod 10. A liquid inlet cavity 13 communicating with the liquid supply cavity 19 through the liquid supply channel 16 is arranged in the liquid inlet pipe 2. A liquid outlet cavity 14 communicating with the valve cavity 15 and the liquid supply cavity 19 is arranged in the liquid outlet pipe 3. The top of the lifting and opening and closing valve core 17 is provided with a combined sealing block 20. A bottom sealing groove 22 matching the top of the combined sealing block 20 is opened on the inner wall of the valve body 1 at the top of the valve cavity 15.

[0031] The lifting and opening / closing valve core 17 is a conical structure with an arc-shaped bottom. The shape of the liquid supply cavity 19 conforms to the shape of the lifting and opening / closing valve core 17. The inner wall of the valve core fitting shell 24 conforms to the outer wall of the lifting and opening / closing valve core 17. A top sealing groove 18 that cooperates with the bottom of the combined sealing block 20 is provided at the top of the valve core fitting shell 24. The inner diameter of the valve cavity 15 conforms to the outer diameter of the combined sealing block 20. The inner diameter of the bottom sealing groove 22 conforms to the outer diameter of the combined sealing block 20. The valve stem 6 and the valve cover 5 are an integral structure. A screw rod installation cavity 12 that communicates with each other is provided inside the valve stem 6 and the valve cover 5. The middle part of the screw rod 10 is sleeved inside the screw rod installation cavity 12. An external thread layer is provided above the middle part of the screw rod 10. A threaded connection hole that communicates with the screw rod installation cavity 12 is provided at the center position of the threaded support seat 7. An internal thread layer that cooperates with the external thread layer is provided in the threaded connection hole. The pressure-resistant sealing member 11 is provided on the inner wall of the screw rod installation cavity 12 below the valve cover 5.

[0032] The pressure-resistant sealing cavity 23 is provided on the inner walls of the valve seat 4 and the valve cover 5. The bottom of the lifting and opening / closing valve core 17 is connected to the bottom of the screw rod 10 through a rotating connector 21. Reinforcing connecting ribs 9 are provided between the outer wall of the valve cavity 15 and the outer wall of the liquid inlet pipe 2 and between the outer wall of the liquid supply cavity 19 and the outer wall of the liquid outlet pipe 3. Heat dissipation fins are provided on the reinforcing connecting ribs 9. The valve core fitting shell 24 and the outer wall of the valve cavity 15 are an integral structure. The inner diameter of the top sealing groove 18 conforms to the outer diameter of the combined sealing block 20. The included angle between the inner wall of the valve core fitting shell 24 and the axis of the valve cavity 15 is an acute angle.

[0033] During specific operation, the lifting and opening / closing valve core 17 adopts a conical structure with an arc-shaped bottom. The top of the valve core fitting shell 24 has an opening that communicates with the valve cavity 15. The lifting and opening / closing valve core 17 can move up and down freely in the liquid supply cavity 19. During its movement, the rotation of the handwheel 8 drives the screw 10 to rotate. The external thread layer of the screw 10 is engaged with the internal thread layer in the threaded connection hole provided at the central position of the threaded support seat 7, achieving the lifting of the screw 10. In the closed position state, the lifting and opening / closing valve core 17 runs to the bottom of the liquid supply cavity 19 and forms a fitting closure. The outer wall of the lifting and opening / closing valve core 17 contacts the inner wall of the valve core fitting shell 24. One side of the lifting and opening / closing valve core 17 closes the liquid supply channel 16. When the handwheel 8 is rotated to open, the screw 10 drives the top of the lifting and opening / closing valve core 17 to move vertically into the valve cavity 15. The bottom of the combined sealing block 20 disengages from the top sealing groove 18, and an annular gap appears between the outer wall of the lifting and opening / closing valve core 17 and the inner wall of the valve core fitting shell 24. The side wall of the lifting and opening / closing valve core 17 loses its block on the liquid supply channel 16, and the liquid medium enters the liquid supply cavity 19 from the liquid inlet cavity 13 through the liquid supply channel 16. When the lifting and opening / closing valve core 17 has not completely disengaged from the liquid supply cavity 19, the high-pressure medium performs a swirling flow through the working surface with a conical structure at the bottom. During this process, the high-pressure medium is buffered and decompressed through the outer wall of the lifting and opening / closing valve core 17. After the liquid medium is buffered and decompressed, it flows into the valve cavity 15. As the lifting and opening / closing valve core 17 continues to rise, finally the top of the combined sealing block 20 falls into the bottom sealing groove 22, sealing the pressure-resistant sealing cavity 23, preventing the lifting and sealing waterproof component from being scoured by the high-pressure medium, and at the same time forming an independent cavity for the pressure-resistant sealing cavity 23, improving the pressure resistance at the connection position between the valve seat 4 and the valve cover 5, and avoiding the leakage of bleeding liquid medium.

[0034] After the liquid medium enters the valve cavity 15, and at the same time the lifting and opening / closing valve core 17 displaces into the valve cavity 15, after the bottom conical surface structure of the lifting and opening / closing valve core 17 forms a slow flow of the liquid, the liquid is discharged through the liquid outlet cavity 14. In a high-temperature environment or during the transportation of high-pressure and high-temperature media, the strengthening connecting rib 9 provides high-strength support for the curved neck part of the valve, and heat dissipation treatment is carried out on the curved neck part using the heat sink, reducing the adverse factors caused by thermal strain, enhancing the strength of the product, and at the same time being able to use the slow flow of the inner cavity matching structure and the liquid multi-cavity distribution method to reduce the erosion and impact of the pressure medium, extending the service life of the product.

[0035] Example 2, as Figure 5 、 6, as shown in Figures 7 and 8, a combined high-temperature and high-pressure valve sealing structure includes a screw rod 10. A lifting and opening / closing valve core 17 is installed at the bottom of the screw rod 10. The bottom of the lifting and opening / closing valve core 17 cooperates with a liquid supply chamber 19. A valve core fitting shell 24 with an inner diameter matching the outer diameter of the lifting and opening / closing valve core 17 is arranged outside the liquid supply chamber 19. A liquid supply channel 16 communicating with the liquid supply chamber 19 is provided on the valve core fitting shell 24.

[0036] This embodiment also uses the above sealing structure to manufacture a valve. A valve with a combined high-temperature and high-pressure valve sealing structure includes a valve body 1, a liquid inlet pipe 2, a liquid outlet pipe 3, a valve seat 4, a valve cover 5, and a valve rod 6 arranged on the valve body 1. A threaded support seat 7 is fixedly installed at the top of the valve rod 6. The screw rod 10 is installed in the threaded support seat 7 and the valve rod 6. A handwheel 8 is fixedly installed at the top of the screw rod 10. A valve chamber 15 is arranged inside the valve body 1. The lifting and opening / closing valve core 17 is installed in the valve chamber 15. The liquid supply chamber 19 is arranged at the lower part of the valve chamber 15. The valve core fitting shell 24 is arranged outside the liquid supply chamber 19. A pressure-resistant sealing chamber 23 is arranged at the upper part of the valve chamber 15. A pressure-resistant sealing member 11 sleeving on the outer wall of the screw rod 10 is arranged in the middle of the valve cover 5. A liquid inlet chamber 13 communicating with the liquid supply chamber 19 through the liquid supply channel 16 is arranged in the liquid inlet pipe 2. A liquid outlet chamber 14 communicating with the valve chamber 15 and the liquid supply chamber 19 is arranged in the liquid outlet pipe 3. A combined sealing block 20 is arranged at the top of the lifting and opening / closing valve core 17. A bottom sealing groove 22 matching the top of the combined sealing block 20 is provided on the inner wall of the valve body 1 at the top of the valve chamber 15.

[0037] The lifting and opening / closing valve core 17 is a columnar structure with a trapezoidal longitudinal section. The inner wall of the valve core fitting shell 24 matches the outer wall of the lifting and opening / closing valve core 17. The side of the lifting and opening / closing valve core 17 facing the liquid supply channel 16 is a vertical plane structure. The inner diameter of the valve chamber 15 matches the outer diameter of the combined sealing block 20. The inner diameter of the bottom sealing groove 22 matches the outer diameter of the combined sealing block 20. The valve rod 6 and the valve cover 5 are an integral structure. A screw rod installation cavity 12 communicating with each other is arranged inside the valve rod 6 and the valve cover 5. The middle part of the screw rod 10 is sleeved in the screw rod installation cavity 12. An external thread layer is provided above the middle part of the screw rod 10. A threaded connection hole communicating with the screw rod installation cavity 12 is arranged at the central position of the threaded support seat 7. An internal thread layer matching the external thread layer is arranged in the threaded connection hole. The pressure-resistant sealing member 11 is arranged on the inner wall of the screw rod installation cavity 12 below the valve cover 5. The pressure-resistant sealing chamber 23 is arranged on the inner walls of the valve seat 4 and the valve cover 5. The bottom of the lifting and opening / closing valve core 17 is connected to the bottom of the screw rod 10 through a rotating connecting piece 21.

[0038] Reinforcing connecting ribs 9 are provided between the outer wall of the valve cavity 15 and the outer wall of the liquid inlet pipe 2, and between the outer wall of the liquid supply cavity 19 and the outer wall of the liquid outlet pipe 3. Heat dissipation fins are provided on the reinforcing connecting ribs 9. The inner wall on one side of the liquid supply channel 16 opened in the valve core fitting shell 24 is parallel to the axis of the valve cavity 15, and the included angle between the inner wall on the other side of the valve core fitting shell 24 and the axis of the valve cavity 15 is an acute angle.

[0039] In this embodiment, a vertical layout structure of the valve core fitting shell 24 at the contact position between the lifting and opening / closing valve core 17 and the liquid supply channel 16 is adopted. Different from Embodiment 1, the bottom of the combined sealing block is designed to fit with the top opening position of the valve core fitting shell 24, and the inner diameter of the top of the valve core fitting shell 24 and the outer diameter of the combined sealing block are mutually attached in the closed state.

[0040] During specific operation, after the lifting operation of the lifting and opening / closing valve core 17 is implemented, the liquid supply channel 16 is not fully opened. Since the liquid supply channel 16 has a planar opening structure and one side of the lifting and opening / closing valve core 17 has a vertical planar structure, during the lifting process of the lifting and opening / closing valve core 17, not only can the liquid supply channel 16 be closed or opened, but also the liquid flow rate can be controlled. When the handwheel 8 rotates to open, the screw rod 10 drives the top of the lifting and opening / closing valve core 17 to move vertically into the valve cavity 15. The outer wall of the combined sealing block 20 disengages from the top inner wall of the liquid supply cavity 19. The arc-shaped end of the lifting and opening / closing valve core 17 disengages from the inner wall of the valve core fitting shell 24, and the vertical end surface of the lifting and opening / closing valve core 17 contacts and moves upward along the inner wall on the other side of the valve core fitting shell 24. When the bottom height of the lifting and opening / closing valve core 17 is lower than the bottommost height of the opening of the liquid supply channel 16, the liquid medium cannot flow out. When the bottom height of the lifting and opening / closing valve core 17 is higher than the bottommost height of the opening of the liquid supply channel 16, the liquid medium flows out. Therefore, by adjusting the height of the lifting and opening / closing valve core 17, not only can the opening and closing of the liquid supply channel 16 be achieved, but also the liquid flow rate of the liquid supply channel 16 can be controlled.

[0041] When the liquid supply channel 16 is fully opened or partially opened, the high-pressure medium flows out through the channel between the outer wall of the lifting and opening / closing valve core 17 and the inner wall of the valve core fitting shell 24. During the outflow process, the arc-shaped outer side surface of the lifting and opening / closing valve core 17 buffers and decompresses the outflowing liquid. After the liquid medium is buffered and decompressed, it flows into the valve cavity 15. As the lifting and opening / closing valve core 17 continues to rise, finally the top of the combined sealing block 20 falls into the bottom sealing groove 22 to seal the pressure-resistant sealing cavity 23, preventing the lifting and sealing waterproof component from being scoured by the high-pressure medium. At the same time, the pressure-resistant sealing cavity 23 is formed into an independent cavity, improving the pressure resistance at the connection position between the valve seat 4 and the valve cover 5 and avoiding the leakage of the bleeding liquid medium.

[0042] After the liquid medium enters the valve cavity 15, the lifting and opening / closing valve core 17 is displaced into the valve cavity 15 at the same time. After the bottom plane and the side wall arc surface structure of the lifting and opening / closing valve core 17 form a slow flow of the liquid, the liquid is discharged through the liquid outlet cavity 14. In a high-temperature environment or during the transportation of high-pressure and high-temperature media, the strengthening connecting rib 9 provides high-strength support for the curved neck part of the valve, and the heat sink is used to dissipate heat from the curved neck part, reducing the adverse factors caused by thermal strain, enhancing the strength of the product. At the same time, the slow flow of the inner cavity matching structure and the liquid multi-cavity distribution method can be used to reduce the erosion and impact of the pressure medium, and extend the service life of the product.

[0043] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A combined sealing structure for high-temperature and high-pressure valves, comprising a screw rod (10), characterized in that: The bottom of the described screw rod (10) is provided with a lifting and opening / closing valve core (17). The bottom of the lifting and opening / closing valve core (17) is matched with the liquid supply cavity (19). Outside the liquid supply cavity (19), there is a valve core matching shell (24) with an inner diameter matching the outer diameter of the lifting and opening / closing valve core (17). A liquid supply channel (16) communicating with the liquid supply cavity (19) is opened on the valve core matching shell (24).

2. A valve with the combined high-temperature and high-pressure valve sealing structure described in claim 1, comprising a valve body (1), a liquid inlet pipe (2), a liquid outlet pipe (3), a valve seat (4), a valve cover (5), and a valve stem (6) provided on the valve body (1), characterized in that: At the top of the described valve rod (6), a threaded support seat (7) is fixedly installed. The screw rod (10) is installed in the threaded support seat (7) and the valve rod (6). At the top of the screw rod (10), a handwheel (8) is fixedly installed. Inside the valve body (1), there is a valve cavity (15). The lifting and opening / closing valve core (17) is installed in the valve cavity (15). The liquid supply cavity (19) is arranged at the lower part of the valve cavity (15). The valve core matching shell (24) is arranged outside the liquid supply cavity (19). At the upper part of the valve cavity (15), there is a pressure-resistant sealing cavity (23). In the middle of the valve cover (5), there is a pressure-resistant sealing member (11) sleeved on the outer wall of the screw rod (10). Inside the liquid inlet pipe (2), there is a liquid inlet cavity (13) communicating with the liquid supply cavity (19) through the liquid supply channel (16). Inside the liquid outlet pipe (3), there is a liquid outlet cavity (14) communicating with the valve cavity (15) and the liquid supply cavity (19). At the top of the lifting and opening / closing valve core (17), there is a combined sealing block (20). On the inner wall of the valve body (1) at the top of the valve cavity (15), there is a bottom sealing groove (22) matching the top of the combined sealing block (20).

3. The valve with the combined high-temperature and high-pressure valve sealing structure according to claim 2, characterized in that: The described lifting and opening / closing valve core (17) is a conical structure with an arc-shaped bottom. The shape of the liquid supply cavity (19) matches the shape of the lifting and opening / closing valve core (17). The inner wall of the valve core matching shell (24) matches the outer wall of the lifting and opening / closing valve core (17). At the top of the valve core matching shell (24), there is a top sealing groove (18) matching the bottom of the combined sealing block (20).

4. The valve with the combined seal structure of high-temperature and high-pressure valves according to claim 2, characterized in that: The described lifting and opening / closing valve core (17) is a columnar structure with a trapezoidal longitudinal section. The inner wall of the valve core matching shell (24) matches the outer wall of the lifting and opening / closing valve core (17). The side of the lifting and opening / closing valve core (17) facing the liquid supply channel (16) is a vertical plane structure.

5. The valve with the combined seal structure for high-temperature and high-pressure valves according to claim 2, characterized in that: The inner diameter of the described valve cavity (15) matches the outer diameter of the combined sealing block (20). The inner diameter of the bottom sealing groove (22) matches the outer diameter of the combined sealing block (20).

6. The valve with the combined seal structure of high-temperature and high-pressure valves according to claim 2, characterized in that: The described valve rod (6) and the valve cover (5) are of an integral structure. Inside the valve rod (6) and the valve cover (5), there is a screw rod installation cavity (12) communicating with each other. The middle part of the screw rod (10) is sleeved in the screw rod installation cavity (12). Above the middle part of the screw rod (10), there is an external thread layer. At the center position of the threaded support seat (7), there is a threaded connection hole communicating with the screw rod installation cavity (12). Inside the threaded connection hole, there is an internal thread layer matching the external thread layer. The pressure-resistant sealing member (11) is arranged on the inner wall of the screw rod installation cavity (12) below the valve cover (5).

7. The valve with the combined high-temperature and high-pressure valve sealing structure according to claim 2, characterized in that: The described compression sealing cavity (23) is arranged on the inner walls of the valve seat (4) and the valve cover (5), and the bottom of the lifting and opening / closing valve core (17) is connected to the bottom of the screw rod (10) through a rotating connector (21).

8. The valve with the combined high-temperature and high-pressure valve sealing structure according to claim 2, wherein: Reinforcing connecting ribs (9) are arranged between the outer wall of the valve cavity (15) and the outer wall of the liquid inlet pipe (2), and between the outer wall of the liquid supply cavity (19) and the outer wall of the liquid outlet pipe (3), and heat dissipation fins are arranged on the reinforcing connecting ribs (9).

9. The valve with the combined high-temperature and high-pressure valve sealing structure according to claim 3, characterized in that: The valve core fitting shell (24) and the outer wall of the valve cavity (15) are of an integral structure, the inner diameter of the top sealing groove (18) is matched with the outer diameter of the combined sealing block (20), and the included angle between the inner wall of the valve core fitting shell (24) and the axis of the valve cavity (15) is an acute angle.

10. The valve with the combined high-temperature and high-pressure valve sealing structure according to claim 4, characterized in that: The inner wall on one side of the valve core fitting shell (24) where the liquid supply channel (16) is opened is parallel to the axis of the valve cavity (15), and the included angle between the inner wall on the other side of the valve core fitting shell (24) and the axis of the valve cavity (15) is an acute angle.

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