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CN-116447329-B - Liquid helium stop valve with bellows vacuum jacket

CN116447329BCN 116447329 BCN116447329 BCN 116447329BCN-116447329-B

Abstract

The invention relates to the field of valves, in particular to a liquid helium stop valve with a corrugated pipe vacuum jacket, wherein an inner corrugated pipe is arranged between a valve rod and a valve cover, one end of the inner corrugated pipe is propped against the valve cover, the other end of the inner corrugated pipe extends into the valve body, a corrugated pipe vacuum joint vertical to the axial direction of the valve rod is arranged on the valve cover, the corrugated pipe vacuum joint penetrates through the side wall of the valve cover, the inner corrugated pipe is internally pumped through the corrugated pipe vacuum joint to form a vacuum environment, a low-temperature epoxy glass fiber reinforced plastic filling ring is filled between the inner corrugated pipe and the valve body, a winding layer is arranged on the outer wall of the valve body, the winding layer comprises a heat insulation belt and a heat radiation protection layer, the outer wall of the valve body is also provided with a vacuum jacket, the vacuum jacket is fixedly connected with the valve body through an expansion joint, a vacuumizing joint is arranged on the side wall of the vacuum jacket, the vacuum jacket is internally pumped through the vacuumizing joint to form a vacuum environment, the heat conduction of the matched position of the valve rod and the valve cover is reduced through the vacuum inner corrugated pipe and the low-temperature epoxy glass fiber reinforced plastic filling ring, the heat radiation protection layer and the vacuum jacket are used for reducing the heat radiation of the valve body, and the heat insulation effect is good.

Inventors

  • SHANG YULAI
  • Jin Kadi
  • Gu Shangzhu
  • YE XUNLIANG
  • YU KANG
  • Chen anding
  • GE ZHIKE

Assignees

  • 浙江伯特利科技股份有限公司

Dates

Publication Date
20260505
Application Date
20230331

Claims (9)

  1. 1. The utility model provides a liquid helium stop valve with bellows vacuum jacket, includes valve body (1), valve rod (2) and valve gap (3), the inside of valve body (1) is equipped with disk seat (5), valve rod (2) lower extreme is equipped with valve clack (6), valve rod (2) stretch into valve body (1) and pass through valve clack (6) and disk seat (5) cooperation, inlet channel (7) and outlet channel (8) are separated into through the cooperation of valve clack (6) and disk seat (5) in valve body (1) inside, valve gap (3) and valve body (1) pass through bolt fixed connection; The valve is characterized in that an inner corrugated pipe (11) is arranged between a valve rod (2) and a valve cover (3), one end of the inner corrugated pipe (11) is fixedly connected with the valve cover (3), the other end of the inner corrugated pipe extends to the inside of the valve body (1) and is fixedly connected with the valve rod (2), a corrugated pipe vacuum joint (12) perpendicular to the axial direction of the valve rod (2) is arranged on the valve cover (3), the corrugated pipe vacuum joint (12) penetrates through the side wall of the valve cover (3), the inside of the inner corrugated pipe (11) is pumped through the corrugated pipe vacuum joint (12) to form a vacuum environment, a low-temperature epoxy glass fiber reinforced plastic filling ring (13) is filled between the inner corrugated pipe (11) and the valve body (1), a winding layer is arranged on the outer wall of the valve body (1), the winding layer comprises a heat insulation belt (14) and a heat radiation prevention layer (15), a vacuum jacket (16) is further arranged on the outer wall of the valve body (1), the vacuum jacket (16) is fixedly connected with the valve body (1) through a telescopic joint (17), and a vacuum pumping joint (18) is arranged on the side wall of the vacuum jacket (16), and the inside of the vacuum jacket (16) is pumped through the telescopic joint (18) to form a vacuum environment; The valve is characterized in that an extension valve body design is arranged at the upper end of the valve body (1), the valve rod (2) is in a split type design, an extension valve rod pipe (19) is arranged between the valve rod (2) and the valve clack (6), a small gap is reserved between the extension valve rod pipe (19) and the extension valve body, a first locking mechanism (21) is arranged between the valve rod (2) and the extension valve rod pipe (19), the first locking mechanism (21) comprises a valve rod nut (22) and a first connecting block (23), the valve rod nut (22) is arranged between the valve rod (2) and the first connecting block (23), the valve rod nut (22) is in threaded connection with the first connecting block (23), a valve rod pipe connecting part (24) is upwards extended from the upper end of the extension valve rod pipe (19), a first connecting part (25) is arranged at the lower end of the valve rod (2), the first connecting part (25) extends between the first connecting block (23) and the valve rod pipe connecting part (24), the first connecting part (25) and the first connecting block (23) are fixedly connected with the valve rod (2) through a rotary fastener (19); The valve rod is characterized in that a second locking mechanism (26) is arranged between the lengthened valve rod pipe (19) and the valve clack (6), the second locking mechanism (26) comprises a valve rod pipe nut (27) and a second connecting block (28), the valve rod pipe nut (27) is arranged between the lengthened valve rod pipe (19) and the second connecting block (28), the valve rod pipe nut (27) is in threaded connection with the second connecting block (28), the upper end of the valve clack (6) is upwards extended to form a valve clack connecting part (29), the lower end of the lengthened valve rod pipe (19) is provided with a second connecting part (30), the second connecting part (30) is extended to a position between the second connecting block (28) and the valve clack connecting part (29), the second connecting part (30) and the second connecting block (28) are fixedly connected through fasteners, and the valve rod pipe (19) is fixedly connected with the valve clack (6) through the second locking mechanism (26), and the valve clack (6) rotates along with the lengthened valve rod pipe (19).
  2. 2. The liquid helium stop valve with the corrugated pipe vacuum jacket according to claim 1, wherein the heat insulation belt (14) is made of aluminum foil, the heat radiation protection layer (15) is made of glass fiber, and the heat insulation belt (14) and the heat radiation protection layer (15) are alternately overlapped and coated in multiple layers.
  3. 3. The liquid helium stop valve with the corrugated pipe vacuum jacket according to claim 1, wherein guide ribs (20) are arranged on the inner wall of the valve body (1) close to the edge of the valve seat (5), and when the valve clack (6) is in a closing stroke, the side wall of the valve clack (6) is attached to the guide ribs (20).
  4. 4. A liquid helium stop valve with a corrugated pipe vacuum jacket is characterized in that a sleeve (31) is sleeved outside a valve clack (6), the upper end of the sleeve (31) is in plug fit with the lower end of a valve rod (2) and is propped against a valve seat (5), an opening with the same diameter as the valve seat (5) is formed for medium circulation, an inner thread is arranged on the inner wall of the sleeve (31), an outer thread matched with the inner thread of the inner wall of the sleeve (31) is arranged on the outer wall of a second connecting block (28), the sleeve (31) is in threaded connection with the second connecting block (28), the thread rotation direction of the outer wall of the second connecting block (28) is the same as the opening and closing rotation direction of the valve rod (2), a first flow channel (32) and a second flow channel (33) are sequentially distributed from bottom to top in the axial direction of the valve rod (2), a first sealing surface (34) is formed on the inner wall of the lowest end of the first flow channel (32), a second sealing surface (35) is formed on the inner wall of the lowest end of the second flow channel (33), the valve clack (6) is in threaded connection with the second connecting block (31) in a rotary mode, when the second sealing surface (28) is in threaded connection with the second connecting block (6) and the upper surface (31) is relatively displaced, the inlet channel (7) is communicated with the first flow channel (32), and when the bottom surface of the valve clack (6) is higher than the second sealing surface (35), the inlet channel (7) is communicated with the first flow channel (32) and the second flow channel (33) at the same time.
  5. 5. A liquid helium shut-off valve with a bellows vacuum jacket according to claim 4, wherein the upper end of the sleeve (31) is provided with a sleeve connection block (36), the sleeve connection block (36) is fixedly connected with the sleeve (31) through a fastener, the bottom surface of the sleeve connection block (36) is provided with a sleeve abutting part (37), the inner diameter of the sleeve abutting part (37) is smaller than that of the sleeve (31), the bottom end of the sleeve (31) is provided with a sleeve sealing part (38), the sleeve sealing part (38) abuts against the valve seat (5), the second connection block (28) is rotationally lifted to abut against the sleeve abutting part (37), when the second connection block (28) abuts against the sleeve abutting part (37), the inlet channel (7) is communicated with the first flow channel (32) and the second flow channel (32) at the same time, and when the second connection block (28) is lifted continuously, the sleeve (31) is lifted along with the lifting of the second connection block (28), the sleeve sealing part (38) is lifted away from the valve seat (5) to form a third flow channel (7).
  6. 6. A liquid helium stop valve with a corrugated pipe vacuum jacket is characterized in that a build-up layer (39) is built on the edge of the lower end face of a valve clack (6), a conical sealing surface is arranged on the edge of the build-up layer (39), a first abutting block (40) and a second abutting block (41) are arranged on the inner wall of a sleeve sealing part (38), the first abutting block (40) and the second abutting block (41) are fixedly connected through a fastener, a valve seat sealing layer (42) is arranged at the matching position of the valve seat (5) and the sleeve sealing part (38), the first abutting block (40) abuts against the build-up layer (39), the second abutting block (41) abuts against the valve seat sealing layer (42), an inclined angle is arranged at the matching position of the valve seat sealing layer (42) and the second abutting block (41), and an arc sealing part (43) is arranged at the matching position of the sleeve sealing part (38) and the valve seat sealing layer (42).
  7. 7. A liquid helium stop valve with a bellows vacuum jacket according to claim 5, wherein an annular sealing ring (44) is arranged at the matching position of the sleeve connecting block (36) and the valve rod (2), a buffer packing layer (45) is arranged at the matching position of the sleeve abutting part (37) and the sleeve (31), and a sealing block (46) is arranged at the matching position of the second connecting block (28) and the sleeve (31).
  8. 8. The liquid helium stop valve with the corrugated pipe vacuum jacket according to claim 1, wherein the inlet channel (7) and the outlet channel (8) are respectively provided with a flange sealing structure, the flange sealing structures comprise a flange (47) and a lining heat preservation layer (48), the lining heat preservation layer (48) is fixedly connected with the flange (47) through a bolt piece, the lining heat preservation layer (48) extends to the inner wall of the valve body (1) and a conical lug (49) is arranged at the matching position of the extending position and the valve body (1), a conical groove matched with the conical lug (49) is formed in the inner wall of the valve body (1), a conical guide part (50) is further arranged on the outer end face of the lining heat preservation layer (48), and a special-shaped sealing ring (51) is arranged between the outer end face of the flange (47) and the lining heat preservation layer (48).
  9. 9. The liquid helium stop valve with the corrugated pipe vacuum jacket according to claim 1, further comprising a hand wheel (4), wherein a packing layer (9) is fixedly inlaid in one end, far away from the valve body (1), of the valve cover (3), a packing gland (10) is arranged above the packing layer (9), the packing gland (10) is fixedly connected with the valve cover (3) through a bolt piece, the valve rod (2) penetrates through the packing layer (9) and the packing gland (10) and extends to the upper part of the packing gland (10), one end, far away from the valve clack (6), of the valve rod (2) is fixedly connected with the hand wheel (4) through a hand wheel nut, a first filter screen (52) is arranged in the inlet channel (7), and a second filter screen (53) is arranged on the valve seat (5).

Description

Liquid helium stop valve with bellows vacuum jacket Technical Field The invention relates to the field of valves, in particular to a liquid helium stop valve with a corrugated pipe vacuum jacket. Background The low temperature cut-off valve is a valve in which a closing member (valve flap) moves along a center line of a valve seat. According to this form of movement of the valve flap, the valve seat opening varies in direct proportion to the valve flap travel. The valve rod of the valve has relatively short opening or closing stroke, has very reliable cutting function, and is very suitable for regulating flow rate due to the proportional relation between the change of the valve seat through opening and the stroke of the valve clack. Thus, this type of valve is well suited for use as a shut-off or regulating valve. In the ultra-low temperature environment (the temperature is less than or equal to minus 101 ℃), an ultra-low temperature stop valve is needed to be adopted when the ultra-low temperature medium is transported. The ultra-low temperature stop valve is a stop device applied to low temperature working conditions, and plays an important role in the industrial field of low temperature industry with the common working condition temperature below-101 ℃. The low-temperature stop valve has harsh working conditions, so the requirement on the sealing performance of the valve is extremely high. Through retrieving, chinese patent CN211852951U discloses a low temperature stop valve, including valve body, valve clack, valve rod, valve gap and hand wheel, the inside of valve body is divided into first cavity and second cavity through the valve clack, the valve gap passes through bolt fixed connection with the valve body, and the junction of valve gap and valve body is equipped with the gasket, the valve gap is kept away from the inside fixed mosaic of valve body one end and is had the filler. This low temperature stop valve through set up the gasket in the junction of valve gap and valve body, and the valve rod sets up the filler in the inside of valve gap, seals the junction of valve body and valve gap, installs the valve rod in the inside of filler to promote the leakproofness of valve rod in the valve gap, thereby effectually avoid medium in the valve body to leak from the gap between valve body and the valve gap and the valve rod and the valve gap between the valve gap, thereby solved traditional low temperature valve and leaked when carrying low temperature medium. However, the inventor further found that the scheme still has the following problems that when the external temperature is higher than the internal temperature of the valve body, heat is conducted into an influence medium in the valve body through the wall of the valve body, and because liquid helium is a low-temperature medium and the chemical property of the liquid helium is influenced by a high-temperature environment, the internal of the stop valve needs to keep the low-temperature environment, and the stop valve with the structure cannot effectively prevent heat exchange between the internal and the external of the valve and cannot keep the low-temperature environment in the valve. Disclosure of Invention The invention aims to overcome the defects and shortcomings in the prior art and provides a liquid helium stop valve with a corrugated pipe vacuum jacket. The liquid helium stop valve with the corrugated pipe vacuum jacket comprises a valve body, a valve rod and a valve cover, wherein a valve seat is arranged in the valve body, a valve clack is arranged at the lower end of the valve rod, the valve rod stretches into the valve body to be matched with the valve seat through the valve clack, the interior of the valve body is separated into an inlet channel and an outlet channel through the matching of the valve clack and the valve seat, and the valve cover is fixedly connected with the valve body through bolts; The valve is characterized in that an inner corrugated pipe is arranged between the valve rod and the valve cover, one end of the inner corrugated pipe is fixedly connected with the valve cover, the other end of the inner corrugated pipe is extended into the valve body and is fixedly connected with the valve rod, a corrugated pipe vacuum connector perpendicular to the axial direction of the valve rod is arranged on the valve cover, the corrugated pipe vacuum connector penetrates through the side wall of the valve cover, the interior of the inner corrugated pipe is evacuated through the corrugated pipe vacuum connector to form a vacuum environment, a low-temperature epoxy glass fiber reinforced plastic filling ring is filled between the inner corrugated pipe and the valve body, a winding layer is arranged on the outer wall of the valve body, the winding layer comprises a heat insulation belt and a heat radiation protection layer, a vacuum jacket is further arranged on the outer wall of the valve body, the vacuum jacket is fixedly connecte