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CN-121977076-A - Ultra-low temperature valve extension valve gap structure

CN121977076ACN 121977076 ACN121977076 ACN 121977076ACN-121977076-A

Abstract

The invention relates to the technical field of ultralow temperature valves, and discloses an ultralow temperature valve lengthening valve cover structure which comprises a driving structure, a closed structure and a plurality of pressing structures, wherein a spiral spring capable of applying upward elastic pressure to an annular sealing ring is arranged in the ultralow temperature valve lengthening valve cover structure. This ultra-low temperature valve extension valve gap structure makes the rubber spare that is in relative fixed position produce sufficient leakproofness under the pressure of snap ring, makes the sealing member that is in relative movable part receive towards fixed structure surface's pressure again to make the sealing member can be under the centre gripping of pressure, tightly laminate on fixed structure surface, thereby effectively improve the leakproofness of equipment, reduce the emergence of liquid or gaseous leakage phenomenon.

Inventors

  • CUI ZHENGYI
  • TANG ZEJUN

Assignees

  • 崔郑艺

Dates

Publication Date
20260505
Application Date
20240409

Claims (10)

  1. 1. An ultra-low temperature valve lengthening valve cover structure comprises a transverse pipeline (1), a partition plate (3) which is integrally arranged in the transverse pipeline (1) and divides the inner space of the partition plate into a feeding cavity a and a discharging cavity b, an arc-shaped through hole (2) which is arranged in the partition plate (3), a bottom longitudinal pipeline (4) which is integrally arranged at the top of the circumferential side surface of the transverse pipeline (1), a first cavity (5) which is arranged in the bottom longitudinal pipeline (4), a top longitudinal pipeline (6) which is fixedly arranged at the top end of the bottom longitudinal pipeline (4), a second cavity (12) which is arranged at the bottom end of the top longitudinal pipeline (6), a third cavity (8) which is arranged above the second cavity (12), a fourth cavity (9) which is arranged above the third cavity (8), a bottom rod hole (7) which is arranged between the second cavity (12) and the third cavity (8), a top rod hole (10) which is integrally arranged between the third cavity (8) and the fourth cavity (9), a first channel (11) which is integrally arranged at the circumferential side surface of the top longitudinal pipeline (6) and is communicated with the third cavity (8), and the second channel (13), The driving structure (14) is internally provided with an external screw rod (141) capable of changing the longitudinal height of the driving structure when rotating and a longitudinal movable rod (145) which extends into the first cavity (5) from top to bottom and can longitudinally move along with the external screw rod (141); The sealing structure (15) is internally provided with a hemispherical valve (158) which is arranged at the bottom end of the longitudinal movable rod (145) and can seal the arc-shaped through hole (2), a rubber bag (156) which can seal the installation part of the longitudinal movable rod (145) and an annular sealing ring (153) which can be in interference with the second cavity (12) and prevent a medium from flowing along the interference part; And a plurality of pressing structures (16) provided inside with coil springs (166) capable of applying upward elastic pressure to the ring seal (153).
  2. 2. The ultra-low temperature valve lengthening valve cover structure according to claim 1, wherein the driving structure (14) comprises an external threaded rod (141) penetrating through the top end structure of the top longitudinal pipeline (6) and a threaded cap (146) fixedly installed at the top end of the top longitudinal pipeline (6), an internal threaded hole (147) is formed in the center of the threaded cap (146), a rod body of the external threaded rod (141) penetrates through the internal threaded hole (147), the rod body of the external threaded rod (141) is connected with the internal threaded hole (147) through a threaded structure, a rotating plate (142) which is integrally formed with the external threaded rod (141) is arranged at the top end of the external threaded rod (141), the external threaded rod (141) is installed inside a shaft body fixing groove (144) of a shaft sleeve shell (143) at one end located inside the fourth cavity (9) through a bearing, and a longitudinal movable rod (145) which sequentially penetrates through the top rod hole (10), the third cavity (8), the bottom rod hole (7) and the second cavity (12) is arranged at the bottom end of the shaft sleeve shell (143).
  3. 3. The ultra-low temperature valve lengthening valve cover structure of claim 2, wherein the thread structure comprises an external thread structure c arranged on a rod body of an external threaded rod (141) and an internal thread structure d arranged in an internal threaded hole (147), and the external thread structure c is matched with the internal thread structure d.
  4. 4. The ultra-low temperature valve lengthening valve cover structure according to claim 3, wherein the sealing structure (15) comprises a top movable plate (151) positioned in a second cavity (12) and a bottom movable plate (152) positioned in a first cavity (5), an upper fixing sleeve structure (154) which is integrated with the top movable plate (151) is arranged at the bottom end of the top movable plate (151), a lower fixing sleeve structure (155) which is integrated with the bottom movable plate (152) is arranged at the upper end surface of the bottom movable plate (152), a longitudinal movable rod (145) is fixedly arranged in the upper fixing sleeve structure (154) and the lower fixing sleeve structure (155) at a rod body positioned in the second cavity (12) and the first cavity (5), a sealing treatment is carried out between the circumferential side surfaces of the upper fixing sleeve structure (154) and the lower fixing sleeve structure (155) through a capsule (156), the rubber capsule (156) is tightly embedded in the upper end surface of the annular sealing ring (153) of the upper movable plate (151) through a structure at the periphery of the upper fixing sleeve structure (154) and the lower fixing sleeve structure (155), the bottom of lower fixed cover structure (155) is provided with and fixes cover structure (155) as an organic whole structure just can block up hemisphere valve (158) in arc opening (2) down, hemisphere rubber (159) are embedded to hemisphere valve (158)'s curved surface.
  5. 5. The ultra-low temperature valve extension valve cover structure according to claim 4, wherein the rubber bag (156) has a length enough to enable the top movable plate (151) and the bottom movable plate (152) to move to the top end of the second cavity (12) and the bottom end of the first cavity (5) without being pulled.
  6. 6. The ultra-low temperature valve lengthening valve cover structure according to claim 5, wherein the pressing structure (16) comprises a longitudinal hollow rod (161) and a polygonal telescopic rod (162), the bottom end of the longitudinal hollow rod (161) is fixedly arranged on the upper end face of the bottom movable plate (152) through a bottom fixing plate (163), the top end of the polygonal telescopic rod (162) is fixedly arranged on the lower end face of the top movable plate (151) through a top fixing plate (164), a polygonal telescopic hole (165) with an open top end is formed in the longitudinal hollow rod (161), the polygonal telescopic rod (162) is inserted into the polygonal telescopic hole (165) and can axially move along the polygonal telescopic hole (165), a spiral spring (166) in a compressed state is sleeved between the bottom fixing plate (163) and the top fixing plate (164), and the elastic strength of the spiral spring (166) is enough to enable the annular sealing ring (153) to generate pressure for preventing media from flowing along a gap on the top end structure of the second-size cavity (12).
  7. 7. The ultra-low temperature valve lengthening valve cover structure of claim 6, wherein the cross section of the polygonal telescopic hole (165) has a structural shape identical to that of the cross section of the polygonal telescopic rod (162), and is of a polygonal structure, and the cross section of the polygonal telescopic hole (165) has a structural size matched with that of the cross section of the polygonal telescopic rod (162).
  8. 8. The ultra-low temperature valve lengthening valve cover structure according to any one of claims 1-7, further comprising a gravity flow control structure (17) with a spherical hollow shell (171) in a longitudinal orientation and a sphere (177) placed inside the spherical hollow shell (171) and capable of preventing media from flowing from top to bottom under self gravity.
  9. 9. The ultra-low temperature valve lengthening valve cover structure according to claim 8, wherein the gravity type flow control structure (17) comprises a spherical hollow shell (171) with a vertical longitudinal axis, a lower butt joint channel (173) of an integrated structure is arranged at the bottom end of the spherical hollow shell (171), an upper butt joint channel (174) of an integrated structure is arranged at the top end of the spherical hollow shell (171), a spherical cavity (172) is arranged in the spherical hollow shell (171), the bottom end of the lower butt joint channel (173) is fixedly connected with a discharge port of the first channel (11), a lower channel hole (175) which is communicated with the bottom end of the spherical cavity (172) and a discharge port of the first channel (11) is arranged in the lower butt joint channel (173), the top end of the upper butt joint channel (174) is fixedly connected with an inlet of the second channel (13), an upper channel hole (176) which is communicated with the top end of the spherical cavity (172) and the second channel (13) is arranged in the spherical hollow shell (171), and the spherical shell (171) can be freely placed in the spherical cavity (177).
  10. 10. The ultra-low temperature valve extension valve cover structure according to claim 9, wherein the structure radius of the lower passage hole (175) is identical to the structure radius of the upper passage hole (176), the structure radius of the lower passage hole (175) and the structure radius of the upper passage hole (176) are smaller than the structure radius of the sphere (177), and the structure radius of the sphere (177) is smaller than the structure radius of the spherical cavity (172).

Description

Ultra-low temperature valve extension valve gap structure Technical Field The invention relates to the technical field of ultralow temperature valves, in particular to an ultralow temperature valve lengthening valve cover structure. Background In recent years, ultra-low temperature valves in China rapidly develop, a large number of ultra-low temperature valves are applied to LNG and petrochemical factories, in the using process, due to space limitation, part of ultra-low temperature valves need to be transversely installed, the original ultra-low temperature valves in the market are limited by ultra-low temperature lengthened valve cover structures and are not allowed to be transversely installed, GB/T24925 and BS6364 clearly define that the valve installation inclination angle is not larger than 45 degrees, and the reason is that the valve installation inclination angle is too large or transversely installed, a pipeline low-temperature medium can directly contact sealing filler at the upper end of a lengthened valve cover, the sealing filler is in an environment far lower than 0 ℃, the sealing filler is damaged, and finally the accident of external leakage of the valve is caused. For example, chinese patent publication No. CN117108805B discloses an ultra-low temperature valve lengthening valve cover structure, which is provided with a filling groove inside, so that filling substances can be conveniently added into the valve, a circle of cold insulation layer is formed after filling is completed, and thus the internal structure is conveniently protected, the top opening and the inner diameter of the lengthening cover body are the same, and the inner wall is provided with threads, so that the structure of the inner sealing part is conveniently installed and fixed, the sealing performance of the driving rod is conveniently kept, but in the actual use process, due to the characteristic of connection of the device thread structure, liquid or liquid can leak along the thread gap, particularly when the valve is in an open state, the liquid or liquid can generate a risk of leaking along the part gap under the action of strong pressure, and the greater the pressure, the greater the leakage risk. For another example, chinese patent publication No. CN215806728U discloses an ultra-low temperature valve extension valve cover structure, which mainly includes triple seals, and can effectively prevent leakage of medium from the position of the valve extension valve rod, and ensure effectiveness of valve external seal. However, in the practical use, since the sealing manner is to seal the shaft body and the shaft hole by installing the sealing ring between them or the like, in fact, since the shaft body and the shaft hole are fixed in size after being set, in order to improve the sealing property, the sealing ring needs to be compressed, and the acting force after compression needs to face the annular surfaces of the shaft body and the shaft hole, in the use, since the acting force of the gas or the liquid acts on the annular end face of the sealing ring, the sealing ring cannot always keep the pressure of the sealing ring facing the annular surfaces of the shaft body and the shaft hole, the leakage of the gas or the liquid along the movable gap is easy to be caused, and the sealing effect achieved by the sealing ring is poor. Disclosure of Invention Aiming at the defects of the prior art, the invention provides an ultra-low temperature valve lengthening valve cover structure, which enables a rubber part at a relatively fixed position to generate enough tightness under the pressure of a clamping ring, and then enables the sealing part at a relatively movable position to be subjected to pressure towards the surface of a fixed structure, so that the sealing part can be tightly attached to the surface of the fixed structure under the clamping of the pressure, thereby effectively improving the tightness of equipment, reducing the occurrence of liquid or gas leakage phenomenon, and solving the technical problems. The ultra-low temperature valve lengthening valve cover structure comprises a transverse pipeline, a dividing plate integrally arranged in the transverse pipeline and dividing the inner space of the dividing plate into a feeding cavity a and a discharging cavity b, an arc-shaped through hole arranged in the dividing plate, a bottom longitudinal pipeline integrally arranged at the top of the circumferential side surface of the transverse pipeline, a first cavity arranged in the bottom longitudinal pipeline, a top longitudinal pipeline fixedly arranged at the top end of the bottom longitudinal pipeline, a second cavity arranged at the bottom end of the top longitudinal pipeline, a third cavity arranged above the second cavity, a fourth cavity arranged above the third cavity, a bottom rod hole arranged between the second cavity and the third cavity, a first channel and a second channel which are integrally arranged at the