Lengthened valve cover structure of ultralow-temperature valve

Abstract

The invention relates to the technical field of ultralow-temperature valves, and discloses an ultralow-temperature valve lengthened valve deck structure which comprises a driving structure, a sealing structure and a plurality of pressure applying structures, and a spiral spring capable of applying upward elastic pressure to an annular sealing ring is arranged in the ultralow-temperature valve lengthened valve deck structure. According to the lengthened valve cover structure of the ultralow-temperature valve, the rubber part located at the relatively fixed position generates enough sealing performance under the pressure of the clamping ring, and then the sealing part located at the relatively movable part bears the pressure facing the surface of the fixed structure, so that the sealing part can be tightly attached to the surface of the fixed structure under the clamping of the pressure, and the sealing performance is improved. Therefore, the sealing performance of equipment is effectively improved, and the phenomenon of liquid or gas leakage is reduced.

Description

Technical Field

[0001] This invention relates to the field of cryogenic valve technology, specifically to an extended valve cover structure for cryogenic valves. Background Technology

[0002] In recent years, my country's cryogenic valve industry has developed rapidly, with a large number of cryogenic valves being used in LNG and petrochemical plants. During use, due to space constraints, some cryogenic valves need to be installed horizontally. However, existing cryogenic valves on the market are limited by the structure of extended cryogenic valve covers, which does not allow for horizontal installation. GB / T24925 and BS6364 clearly stipulate that the valve installation tilt angle should not exceed 45°. The reason is that if the valve is installed at too large a tilt angle or horizontally, the cryogenic medium in the pipeline will directly contact the sealing packing at the top of the extended valve cover, causing the sealing packing to be in an environment far below 0°C, resulting in damage to the packing seal and ultimately causing valve leakage accidents.

[0003] For example, Chinese patent publication number "CN117108805B" discloses "an extended valve cover structure for an ultra-low temperature valve". It has a filling groove inside to facilitate the addition of filling material and form a cold insulation layer after filling, which facilitates the protection of the internal structure. The top opening of the extended cover is the same as the inner diameter, and the inner wall is threaded to facilitate the installation and fixation of the inner sealing structure, which facilitates the sealing of the driving rod. However, in actual use, due to the characteristics of the threaded connection structure of the equipment, liquid or liquid may leak along the thread gaps. Especially when the valve is in the open state, liquid or liquid may leak along the gaps of the components due to the strong pressure. The higher the pressure, the greater the risk of leakage.

[0004] For example, Chinese patent publication number "CN215806728U" discloses "an extended valve cover structure for an ultra-low temperature valve", whose main structure includes triple sealing, which can effectively prevent the medium from leaking from the extended valve stem position and ensure the effectiveness of the valve's external seal.

[0005] However, in actual use, since the above sealing methods all involve installing a sealing ring or similar method between the shaft and the shaft hole, the dimensions of the shaft and shaft hole are fixed after the design. To improve the sealing performance, the sealing ring needs to be compressed, and the compressed force needs to be directed towards the annular surface of the shaft and shaft hole. During use, since the force of the gas or liquid acts on the annular end face of the sealing ring, and the sealing ring cannot maintain its pressure towards the annular surface of the shaft and shaft hole, gas or liquid is prone to leak along the moving gaps, resulting in poor actual sealing performance. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides an extended valve cover structure for cryogenic valves. This structure allows the rubber component in a relatively fixed position to generate sufficient sealing under the pressure of the retaining ring, while the sealing component in a relatively movable part is subjected to pressure towards the surface of the fixed structure. As a result, the sealing component can be tightly adhered to the surface of the fixed structure under pressure, thereby effectively improving the sealing performance of the equipment, reducing the occurrence of liquid or gas leakage, and solving the aforementioned technical problems.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an extended valve cover structure for a cryogenic valve, comprising a transverse pipe, a partition plate integrally disposed inside the transverse pipe and dividing its internal space into a feed cavity a and a discharge cavity b, an arc-shaped opening disposed in the partition plate, a bottom longitudinal pipe integrally disposed on the top of the circumferential side of the transverse pipe, a first cavity disposed in the bottom longitudinal pipe, a top longitudinal pipe fixedly installed at the top of the bottom longitudinal pipe, a second cavity disposed at the bottom of the top longitudinal pipe, a third cavity disposed above the second cavity, a fourth cavity disposed above the third cavity, a bottom rod hole disposed between the second and third cavities, and a space between the third and fourth cavities. The device includes a top rod hole, an integrally formed channel 1 and channel 2 on the circumferential side of the top longitudinal pipe that connect to the third cavity, a drive structure with an external threaded rod that can change its longitudinal height when rotated, and a longitudinal movable rod that extends from top to bottom into the first cavity and moves longitudinally with the external threaded rod; a sealing structure with a hemispherical valve installed at the bottom of the longitudinal movable rod that can block the arc-shaped opening, a rubber bladder that can seal the installation part of the longitudinal movable rod, and an annular sealing ring that can contact the second cavity and prevent the medium from flowing along the contact part; and multiple pressure-applying structures with helical springs that can apply upward elastic pressure to the annular sealing ring.

[0008] Preferably, the drive structure includes an externally threaded rod penetrating the top of the top longitudinal pipe structure and a threaded cap fixedly installed at the top of the top longitudinal pipe. The threaded cap has an internally threaded hole at its center. The rod body of the externally threaded rod penetrates the internally threaded hole, and the rod body and the internally threaded hole are connected by a threaded structure. The top of the externally threaded rod is provided with a rotating plate that is integral with the externally threaded rod. One end of the externally threaded rod located inside the fourth cavity is mounted inside the shaft fixing groove of the bushing housing by a bearing. The bottom end of the bushing housing is provided with a longitudinally movable rod that is integral with it and sequentially penetrates the top rod hole, the third cavity, the bottom rod hole, and the second cavity.

[0009] Preferably, the threaded structure includes an external thread structure c disposed on the external thread rod body and an internal thread structure d disposed in the internal thread hole, and the external thread structure c and the internal thread structure d are matched.

[0010] Preferably, the closed structure includes a top movable plate located inside the second cavity and a bottom movable plate located inside the first cavity. The bottom end of the top movable plate is provided with an upper fixed sleeve structure integral with the top movable plate, and the upper end face of the bottom movable plate is provided with a lower fixed sleeve structure integral with the bottom movable plate. The longitudinal movable rod is fixedly installed inside the upper and lower fixed sleeve structures within the second and first cavities. The circumferential sides of the upper and lower fixed sleeve structures are sealed by a rubber bladder, and the rubber bladder is tightly fixed by a retaining ring on the outer periphery of the upper and lower fixed sleeve structures. An annular sealing ring is embedded in the upper end face of the top movable plate, and the horizontal height of the top of the annular sealing ring is higher than the horizontal height of the upper end face of the top movable plate. The bottom end of the lower fixed sleeve structure is provided with a hemispherical valve integral with the lower fixed sleeve structure and capable of blocking in the arc-shaped opening. The curved surface of the hemispherical valve is embedded with hemispherical rubber.

[0011] Preferably, the length of the rubber bladder is sufficient to allow the top movable plate and the bottom movable plate to move to the top of the second cavity and the bottom of the first cavity without being stretched.

[0012] Preferably, the pressure-applying structure includes a longitudinal hollow rod and a polygonal telescopic rod. The bottom end of the longitudinal hollow rod is fixedly mounted on the upper end face of the bottom movable plate via a bottom fixing plate, and the top end of the polygonal telescopic rod is fixedly mounted on the lower end face of the top movable plate via a top fixing plate. The interior of the longitudinal hollow rod is provided with a polygonal telescopic hole with an open top. The polygonal telescopic rod is inserted into the interior of the polygonal telescopic hole and can move axially along the polygonal telescopic hole. A compressed helical spring is fitted between the bottom fixing plate and the top fixing plate, and the elastic strength of the helical spring is sufficient to generate pressure on the top structure of the second cavity to prevent the medium from flowing along the gap.

[0013] Preferably, the cross-sectional shape of the polygonal telescopic hole is consistent with the cross-sectional shape of the polygonal telescopic rod, both being polygonal structures, and the structural dimensions of the cross-sectional shape of the polygonal telescopic hole match the structural dimensions of the cross-sectional shape of the polygonal telescopic rod.

[0014] Preferably, it also includes a gravity-type flow control structure, which has a spherical hollow shell in a longitudinal orientation and a sphere placed inside the spherical hollow shell that can prevent the medium from flowing from top to bottom under its own gravity.

[0015] Preferably, the gravity-type flow control structure includes a spherical hollow shell with its longitudinal axis in a vertical position. The bottom end of the spherical hollow shell is provided with a lower docking channel integrally formed with it, and the top end of the spherical hollow shell is provided with an upper docking channel integrally formed with it. The interior of the spherical hollow shell is provided with a spherical cavity. The bottom end of the lower docking channel is fixedly connected to the discharge port of the first channel. The interior of the lower docking channel is provided with a lower channel hole connecting the bottom end of the spherical cavity and the discharge port of the first channel. The top end of the upper docking channel is fixedly connected to the inlet of the second channel. The interior of the upper docking channel is provided with an upper channel hole connecting the top end of the spherical cavity and the inlet of the second channel. A freely movable sphere is placed inside the spherical hollow shell located in the spherical cavity.

[0016] Preferably, the structural radius of the lower channel hole is the same as that of the upper channel hole, and the structural radii of the lower channel hole and the upper channel hole are smaller than the structural radius of the sphere, and the structural radius of the sphere is smaller than the structural radius of the spherical cavity.

[0017] Compared with the prior art, the present invention provides an extended valve cover structure for cryogenic valves, which has the following beneficial effects:

[0018] This cryogenic valve features an extended valve cover structure.

[0019] 1. The rubber parts in a relatively fixed position are subjected to sufficient sealing under the pressure of the retaining ring, and the seals in the relatively moving parts are subjected to pressure toward the surface of the fixed structure. This allows the seals to be tightly adhered to the surface of the fixed structure under the clamping pressure, thereby effectively improving the sealing performance of the equipment and reducing the occurrence of liquid or gas leakage.

[0020] 2. By setting a closed structure, the size of the gap between the hemispherical valve and the arc-shaped port changes as the longitudinal moving rod moves, thereby controlling the flow rate. The movement of the longitudinal moving rod only causes the middle of the rubber bladder to bend. Therefore, the rubber bladder and the fixed retaining ring can prevent the medium from leaking along the gap between the rubber bladder and the longitudinal moving rod. In addition, the annular sealing ring can be tightly attached to the surface of the fixed structure under pressure, thereby effectively improving the sealing performance of the equipment and reducing the occurrence of liquid or gas leakage.

[0021] 3. By setting up a pressure-applying structure, under the elastic action of the helical spring, the top movable plate will generate upward elastic pressure at all times, so that the annular sealing ring is always in a state of elastic compression, thereby generating sufficient elastic pressure. Attached Figure Description

[0022] Figure 1 This is a perspective view of the present invention;

[0023] Figure 2 This is a three-dimensional cross-sectional view of the present invention;

[0024] Figure 3 This is a perspective cross-sectional view of the invention in the horizontal pipe and the top longitudinal pipe;

[0025] Figure 4 This is an exploded perspective view of the driving structure in this invention;

[0026] Figure 5 This is a three-dimensional cross-sectional view of the closed structure in this invention;

[0027] Figure 6 This is an exploded perspective view of the closed structure in this invention;

[0028] Figure 7 This is an exploded perspective view of the pressure-applying structure in this invention;

[0029] Figure 8 This is a three-dimensional cross-sectional view of the gravity-controlled flow structure in this invention.

[0030] The components include: 1. Horizontal pipe; 2. Arc-shaped opening; 3. Dividing plate; 4. Bottom longitudinal pipe; 5. Cavity 1; 6. Top longitudinal pipe; 7. Bottom rod hole; 8. Cavity 3; 9. Cavity 4; 10. Top rod hole; 11. Channel 1; 12. Cavity 2; 13. Channel 2; 14. Drive structure; 141. External threaded rod; 142. Rotating plate; 143. Bushing housing; 144. Shaft fixing groove; 145. Longitudinal movable rod; 146. Threaded cap; 147. Internal threaded hole; 15. Closed structure; 151. Top movable plate; 152. Bottom movable plate; 153. Annular... 154. Sealing ring; 155. Upper fixed sleeve structure; 156. Lower fixed sleeve structure; 157. Rubber bladder; 158. Fixing ring; 159. Hemispherical valve; 16. Hemispherical rubber; 17. Pressure application structure; 161. Longitudinal hollow rod; 162. Polygonal telescopic rod; 163. Bottom fixing plate; 164. Top fixing plate; 165. Polygonal telescopic hole; 166. Helical spring; 17. Gravity-type flow control structure; 171. Spherical hollow shell; 172. Spherical cavity; 173. Lower docking channel; 174. Upper docking channel; 175. Lower channel hole; 176. Upper channel hole; 177. Sphere. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] Please see Figure 1 , Figure 2 and Figure 3 An extended valve cover structure for a cryogenic valve includes a transverse pipe 1, a partition plate 3 integrally disposed inside the transverse pipe 1 and dividing its internal space into a feed cavity a and a discharge cavity b, an arc-shaped opening 2 disposed in the partition plate 3, a bottom longitudinal pipe 4 integrally disposed on the top of the circumferential side of the transverse pipe 1, a first cavity 5 disposed in the bottom longitudinal pipe 4, a top longitudinal pipe 6 fixedly installed at the top of the bottom longitudinal pipe 4, a second cavity 12 disposed at the bottom of the top longitudinal pipe 6, a third cavity 8 disposed above the second cavity 12, a fourth cavity 9 disposed above the third cavity 8, and a bottom cavity between the second cavity 12 and the third cavity 8. Rod hole 7, top rod hole 10 set between cavity 3 8 and cavity 4 9, and channel 11 and channel 2 integrated on the circumferential side of the top longitudinal pipe 6 and connected to cavity 3 8, the feed cavity a of the transverse pipe 1 is connected to the end of the previous discharge pipe used to discharge the cryogenic medium, and the discharge cavity b of the transverse pipe 1 is connected to the end of the next discharge pipe used to transport the cryogenic medium to the tail. In addition, the top of the next discharge pipe connected to the discharge cavity b needs to be drilled, and channel 2 13 is connected to the drilled part in a closed manner. After installation, the longitudinal axis of the spherical hollow shell 171 needs to be at a vertical angle.

[0033] To achieve effective flow control of the medium, please refer to [link / reference]. Figure 1 , Figure 2 and Figure 4 A drive structure 14 needs to be set up, which contains an external threaded rod 141 that can change its longitudinal height when rotating, and a longitudinal movable rod 145 that extends from top to bottom into the first cavity 5 and can move longitudinally with the external threaded rod 141. When the rotating plate 142 is rotated, the external threaded rod 141 will rotate and move longitudinally due to the threaded connection. By controlling the rotation angle of the rotating plate 142, the longitudinal movement direction of the external threaded rod 141 can be controlled. Due to the bearing connection, the longitudinal movable rod 145 will only move longitudinally and will not rotate. The longitudinal movable rod 145 can drive the hemispherical valve 158 to move, control the gap between the hemispherical valve 158 and the arc-shaped port 2, thereby achieving the effect of flow control of the medium.

[0034] For details regarding the specific structure of the drive structure 14, please refer to [link / reference]. Figure 4 The device includes an externally threaded rod 141 that passes through the top end of the longitudinal pipe 6 and a threaded cap 146 fixedly installed at the top end of the longitudinal pipe 6. The threaded cap 146 has an internally threaded hole 147 at its center. The rod body of the externally threaded rod 141 passes through the internally threaded hole 147, and the rod body of the externally threaded rod 141 and the internally threaded hole 147 are connected by a threaded structure. The threaded structure includes an externally threaded structure c provided on the rod body of the externally threaded rod 141 and an internally threaded structure d provided in the internally threaded hole 147. Furthermore, the external thread structure c and the internal thread structure d are matched. The top end of the external thread rod 141 is provided with a rotating plate 142 that is integral with the external thread rod 141. The end of the external thread rod 141 located inside the fourth cavity 9 is installed inside the shaft fixing groove 144 of the bushing housing 143 by a bearing. The bottom end of the bushing housing 143 is provided with a longitudinal movable rod 145 that is integral with it and sequentially passes through the top rod hole 10, the third cavity 8, the bottom rod hole 7 and the second cavity 12.

[0035] To achieve an axial seal at the movable gap and thus prevent media leakage, please refer to [link / reference needed]. Figure 1 , Figure 2 , Figure 5 and Figure 6 A closed structure 15 is required, which contains a hemispherical valve 158 installed at the bottom of the longitudinal movable rod 145 to seal the arc-shaped opening 2, a rubber bladder 156 to seal the mounting part of the longitudinal movable rod 145, and an annular sealing ring 153 that abuts against the second cavity 12 and prevents the medium from flowing along the abutment. When the hemispherical valve 158 moves with the longitudinal movable rod 145, it changes the size of the gap between the hemispherical valve 158 and the arc-shaped opening 2, thereby controlling the flow rate. When the hemispherical valve 158 is in the open state, due to the effective fixed connection of the retaining ring 157 to the rubber bladder 156, the longitudinal movable rod 145 does not generate relative to the rubber bladder. The movement of the longitudinal movable rod 145 at the fixed position of 156 only causes the middle of the rubber bladder 156 to bend, thus enabling the rubber component in the relatively fixed position to generate sufficient sealing under the pressure of the fixed retaining ring 157. Therefore, the rubber bladder 156 and the fixed retaining ring 157 can prevent the leakage of the medium along the gap between the rubber bladder 156 and the longitudinal movable rod 145. By causing the top movable plate 151 to generate an axial force on the internal structure of the second cavity 12, the annular sealing ring 153 can be tightly attached to the surface of the fixed structure under pressure, thereby effectively improving the sealing performance of the equipment and reducing the occurrence of liquid or gas leakage.

[0036] For details regarding the specific structure of the closed structure 15, please refer to [link / reference]. Figure 5 and Figure 6 The system includes a top movable plate 151 located inside the second cavity 12 and a bottom movable plate 152 located inside the first cavity 5. The bottom end of the top movable plate 151 is provided with an upper fixed sleeve structure 154 integrally formed with the top movable plate 151. The upper end face of the bottom movable plate 152 is provided with a lower fixed sleeve structure 155 integrally formed with the bottom movable plate 152. The longitudinal movable rod 145 is fixedly installed inside the upper fixed sleeve structure 154 and the lower fixed sleeve structure 155 within the second cavity 12 and the first cavity 5. The circumferential sides of the upper fixed sleeve structure 154 and the lower fixed sleeve structure 155 are sealed by a rubber bladder 156. To ensure sufficient travel, the rubber bladder needs to... The length of 156 is sufficient to allow the top movable plate 151 and the bottom movable plate 152 to move to the top of the second cavity 12 and the bottom of the first cavity 5 without being pulled. The rubber bladder 156 is tightly fixed by a retaining ring 157 on the structure located around the upper fixed sleeve structure 154 and the lower fixed sleeve structure 155. An annular sealing ring 153 is embedded in the upper end face of the top movable plate 151, and the horizontal height of the top of the annular sealing ring 153 is higher than the horizontal height of the upper end face of the top movable plate 151. A hemispherical valve 158, which is integral with the lower fixed sleeve structure 155 and can be blocked in the arc-shaped opening 2, is provided at the bottom end of the lower fixed sleeve structure 155. A hemispherical rubber 159 is embedded in the curved surface of the hemispherical valve 158.

[0037] To generate sufficient elastic pressure, please refer to Figure 1 , Figure 2 and Figure 7 Multiple pressure-applying structures 16 need to be set up, each containing a helical spring 166 that can apply upward elastic pressure to the annular sealing ring 153. Under the elastic action of the helical spring 166, the top movable plate 151 will generate upward elastic pressure at all times, thereby keeping the annular sealing ring 153 in a state of elastic compression at all times, thus generating sufficient elastic pressure.

[0038] For details regarding the specific structure of the pressure-applying structure 16, please refer to [link / reference]. Figure 7The system includes a longitudinal hollow rod 161 and a polygonal telescopic rod 162. The bottom end of the longitudinal hollow rod 161 is fixedly mounted on the upper end face of the bottom movable plate 152 via a bottom fixing plate 163. The top end of the polygonal telescopic rod 162 is fixedly mounted on the lower end face of the top movable plate 151 via a top fixing plate 164. The longitudinal hollow rod 161 has a polygonal telescopic hole 165 with an open top. To prevent the component from rotating, the cross-sectional shape of the polygonal telescopic hole 165 must match the cross-sectional shape of the polygonal telescopic rod 162. All are polygonal structures, and the cross-sectional dimensions of the polygonal telescopic hole 165 match the cross-sectional dimensions of the polygonal telescopic rod 162. The polygonal telescopic rod 162 is inserted into the interior of the polygonal telescopic hole 165 and can move axially along the polygonal telescopic hole 165. A compressed helical spring 166 is placed between the bottom fixing plate 163 and the top fixing plate 164, and the elastic strength of the helical spring 166 is sufficient to cause the annular sealing ring 153 to exert pressure on the top structure of the second cavity 12 to prevent the medium from flowing along the gap.

[0039] To prevent the media from being released into the environment in the event of a leak, please refer to [link / reference needed]. Figure 1 , Figure 2 and Figure 8 A gravity-controlled flow control structure 17 is required, which contains a spherical hollow shell 171 positioned longitudinally and a sphere 177 placed inside the spherical hollow shell 171. Under its own weight, the sphere prevents the medium from flowing downwards. In the event of upward leakage, the medium will first enter the cavity 8. Since the medium does not experience significant resistance, it will flow along the lower channel hole 175. When the pressure of the medium exceeds the weight of the sphere 177, the medium will sequentially flow through the spherical cavity 172, the upper channel hole 176, and the second channel 13 into the next discharge pipe, thus preventing the medium from being discharged into the external environment in the event of a leak. Of course, during the normal discharge phase, due to the relatively high pressure of the medium during discharge, some of the medium will flow into the spherical cavity 172 along the second channel 13. Under its own pressure, the sphere 177 can stably block the end of the lower channel hole 175, thus preventing backflow of the medium.

[0040] For details regarding the gravity-based flow control structure 17, please refer to [link / reference]. Figure 8The system includes a spherical hollow shell 171 with its longitudinal axis perpendicular to the ground. The bottom of the spherical hollow shell 171 has a lower docking channel 173 integrally formed with it, and the top of the spherical hollow shell 171 has an upper docking channel 174 integrally formed with it. The interior of the spherical hollow shell 171 contains a spherical cavity 172. The bottom of the lower docking channel 173 is fixedly connected to the discharge port of the first channel 11. The interior of the lower docking channel 173 has a lower channel hole 175 connecting the bottom of the spherical cavity 172 and the discharge port of the first channel 11. The top of the upper docking channel 174 is connected to the second channel 13. The inlet is fixedly connected, and the upper docking channel 174 is provided with an upper channel hole 176 that connects the top of the spherical cavity 172 and the inlet of the second channel 13. The spherical hollow shell 171 has a freely movable sphere 177 placed inside the spherical cavity 172. In order to achieve the ability to control the unidirectional flow of the medium, the structural radius of the lower channel hole 175 needs to be the same as the structural radius of the upper channel hole 176, and the structural radii of the lower channel hole 175 and the upper channel hole 176 are smaller than the structural radius of the sphere 177, and the structural radius of the sphere 177 is smaller than the structural radius of the spherical cavity 172.

[0041] The specific working principle of this invention is as follows: the feed cavity a of the transverse pipe 1 is connected to the end of the previous discharge pipe used for discharging the cryogenic medium, and the discharge cavity b of the transverse pipe 1 is connected to the end of the next discharge pipe used for conveying the cryogenic medium to the tail. Furthermore, it is necessary to drill a hole at the top of the next discharge pipe connected to the discharge cavity b, and then connect the second channel 13 to the drilled part in a closed manner. After installation, it is necessary to ensure that the longitudinal axis of the spherical hollow shell 171 is at a vertical angle.

[0042] After rotating the rotating plate 142, due to the threaded connection, the external thread rod 141 will rotate and move longitudinally. By controlling the rotation angle of the rotating plate 142, the longitudinal movement direction of the external thread rod 141 can be controlled. The longitudinal moving rod 145 can drive the ball valve 158 to move, controlling the gap between the ball valve 158 and the arc-shaped port 2, so that the medium can flow normally.

[0043] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cryogenic valve extended cover structure, comprising a transverse pipe (1), a partition plate (3) integrally disposed inside the transverse pipe (1) and dividing its internal space into a feed cavity a and a discharge cavity b, an arc-shaped opening (2) disposed in the partition plate (3), a bottom longitudinal pipe (4) integrally disposed on the top of the circumferential side of the transverse pipe (1), a first cavity (5) disposed in the bottom longitudinal pipe (4), a top longitudinal pipe (6) fixedly installed at the top of the bottom longitudinal pipe (4), and a top longitudinal pipe (6) disposed in the top longitudinal pipe (4). The pipe (6) has a second cavity (12) at the bottom end, a third cavity (8) above the second cavity (12), a fourth cavity (9) above the third cavity (8), a bottom rod hole (7) between the second cavity (12) and the third cavity (8), a top rod hole (10) between the third cavity (8) and the fourth cavity (9), a first channel (11) integrally disposed on the circumferential side of the top longitudinal pipe (6) and communicating with the third cavity (8), and a second channel (13), characterized in that: It also includes, The drive structure (14) is provided with an external thread rod (141) that can change its own longitudinal height when rotating, and a longitudinal movable rod (145) that extends from top to bottom into the first cavity (5) and can move longitudinally with the external thread rod (141). The closed structure (15) is provided with a hemispherical valve (158) installed at the bottom of the longitudinal movable rod (145) and capable of blocking the arc-shaped opening (2), a rubber bladder (156) capable of sealing the installation part of the longitudinal movable rod (145), and an annular sealing ring (153) capable of contacting the second cavity (12) and preventing the medium from flowing along the contact part; And multiple pressure-applying structures (16), which are internally provided with helical springs (166) capable of applying upward elastic pressure to the annular seal (153).

2. The extended valve cover structure for a cryogenic valve according to claim 1, characterized in that: The drive structure (14) includes an externally threaded rod (141) penetrating the top end of the top longitudinal pipe (6) and a threaded cap (146) fixedly installed at the top end of the top longitudinal pipe (6). The threaded cap (146) has an internally threaded hole (147) at its center. The rod body of the externally threaded rod (141) passes through the internally threaded hole (147), and the rod body of the externally threaded rod (141) and the internally threaded hole (147) are connected by a threaded structure. The top is provided with a rotating plate (142) which is integral with the external thread rod (141). The end of the external thread rod (141) located inside the fourth cavity (9) is mounted inside the shaft fixing groove (144) of the bushing housing (143) by a bearing. The bottom end of the bushing housing (143) is provided with a longitudinal movable rod (145) which is integral with it and sequentially passes through the top rod hole (10), the third cavity (8), the bottom rod hole (7) and the second cavity (12).

3. The extended valve cover structure for a cryogenic valve according to claim 2, characterized in that: The threaded structure includes an external thread structure c disposed on the rod body of the external thread rod (141) and an internal thread structure d disposed in the internal thread hole (147), and the external thread structure c and the internal thread structure d are matched.

4. The extended valve cover structure for a cryogenic valve according to claim 3, characterized in that: The closed structure (15) includes a top movable plate (151) located inside the second cavity (12) and a bottom movable plate (152) located inside the first cavity (5). The bottom end of the top movable plate (151) is provided with an upper fixed sleeve structure (154) integral with the top movable plate (151). The upper end face of the bottom movable plate (152) is provided with a lower fixed sleeve structure (155) integral with the bottom movable plate (152). The longitudinal movable rod (145) is fixedly installed inside the upper fixed sleeve structure (154) and the lower fixed sleeve structure (155) within the second cavity (12) and the first cavity (5). The upper fixed sleeve structure (154) and the lower fixed sleeve structure (155) are... The circumferential sides of the 155 are sealed by a rubber bladder (156), and the rubber bladder (156) is tightly fixed by a retaining ring (157) on the structure located around the upper fixed sleeve structure (154) and the lower fixed sleeve structure (155). An annular sealing ring (153) is embedded in the upper end face of the top movable plate (151), and the horizontal height of the top of the annular sealing ring (153) is higher than the horizontal height of the upper end face of the top movable plate (151). A hemispherical valve (158) is provided at the bottom end of the lower fixed sleeve structure (155) and is integral with the lower fixed sleeve structure (155) and can be blocked in the arc-shaped opening (2). A hemispherical rubber (159) is embedded in the curved surface of the hemispherical valve (158).

5. The extended valve cover structure for a cryogenic valve according to claim 4, characterized in that: The length of the rubber bladder (156) is sufficient to allow the top movable plate (151) and the bottom movable plate (152) to move to the top of the second cavity (12) and the bottom of the first cavity (5) without being pulled.

6. The extended valve cover structure for a cryogenic valve according to claim 5, characterized in that: The pressure-applying structure (16) includes a longitudinal hollow rod (161) and a polygonal telescopic rod (162). The bottom end of the longitudinal hollow rod (161) is fixedly installed on the upper surface of the bottom movable plate (152) through a bottom fixing plate (163). The top end of the polygonal telescopic rod (162) is fixedly installed on the lower surface of the top movable plate (151) through a top fixing plate (164). The interior of the longitudinal hollow rod (161) is provided with a polygonal telescopic hole (165) with an open top. The polygonal telescopic rod (162) is inserted into the interior of the polygonal telescopic hole (165) and can move axially along the polygonal telescopic hole (165). A coil spring (166) in a compressed state is placed between the bottom fixing plate (163) and the top fixing plate (164). The elastic strength of the coil spring (166) is sufficient to make the annular sealing ring (153) exert pressure on the top structure of the second cavity (12) to prevent the medium from flowing along the gap.

7. The extended valve cover structure for a cryogenic valve according to claim 6, characterized in that: The cross-sectional shape of the polygonal telescopic hole (165) is consistent with the cross-sectional shape of the polygonal telescopic rod (162), both being polygonal structures, and the structural dimensions of the cross-section of the polygonal telescopic hole (165) match the structural dimensions of the cross-section of the polygonal telescopic rod (162).

8. The extended valve cover structure for a cryogenic valve according to any one of claims 1-7, characterized in that: It also includes a gravity-type flow control structure (17), which has a spherical hollow shell (171) in the longitudinal direction and a sphere (177) placed inside the spherical hollow shell (171) and able to prevent the medium from flowing from top to bottom under its own gravity.

9. The extended valve cover structure for a cryogenic valve according to claim 8, characterized in that: The gravity-type flow control structure (17) includes a spherical hollow shell (171) with its longitudinal axis in a vertical position. The bottom of the spherical hollow shell (171) is provided with a lower docking channel (173) integrally formed with it, and the top of the spherical hollow shell (171) is provided with an upper docking channel (174) integrally formed with it. A spherical cavity (172) is provided inside the spherical hollow shell (171). The bottom end of the lower docking channel (173) is fixedly connected to the discharge port of the first channel (11). The interior of the channel (173) is provided with a lower channel hole (175) that connects the bottom of the spherical cavity (172) and the discharge port of the first channel (11). The top of the upper docking channel (174) is fixedly connected to the inlet of the second channel (13). The interior of the upper docking channel (174) is provided with an upper channel hole (176) that connects the top of the spherical cavity (172) and the inlet of the second channel (13). The spherical hollow shell (171) has a freely movable sphere (177) placed inside the spherical cavity (172).

10. The extended valve cover structure for a cryogenic valve according to claim 9, characterized in that: The structural radius of the lower channel hole (175) is the same as that of the upper channel hole (176), and the structural radii of the lower channel hole (175) and the upper channel hole (176) are smaller than the structural radius of the sphere (177), and the structural radius of the sphere (177) is smaller than the structural radius of the spherical cavity (172).

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