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CN-122014870-A - Ultra-low temperature high-performance self-compensating gate valve

CN122014870ACN 122014870 ACN122014870 ACN 122014870ACN-122014870-A

Abstract

The invention discloses an ultralow-temperature high-performance self-compensating gate valve, which comprises a valve body, a valve cover, a valve rod and a gate plate, wherein the valve cover is arranged at the upper end of the valve body, a support is arranged at the upper end of the valve cover, an executing mechanism is arranged on the support, a valve seat is arranged on the inner wall of the valve body, the gate plate comprises a gate plate frame, a wedge block, an adjusting ball and two gate plate bodies, an inverted T-shaped groove is arranged at the upper end of the wedge block, a valve rod nut is arranged in the inverted T-shaped groove, the lower end of the valve rod extends into the inverted T-shaped groove and is in threaded fit with the valve rod nut, guide channels are arranged on the gate plate frame, the two gate plate bodies are symmetrically arranged at two sides of the gate plate frame, guide bodies which are in sliding fit with the guide channels are arranged on the gate plate body, guide inclined surfaces which are matched with corresponding sides of the wedge block are also arranged on the gate plate frame, and a plurality of limiting pieces for limiting the gate plate bodies which are used for limiting sliding strokes. The invention can ensure the stable operation of the valve under the working condition of low temperature or ultralow temperature, and eliminates the external leakage and the internal leakage of low-temperature medium.

Inventors

  • XU XIAOGUANG
  • MAO ZHENWEI
  • SHI LIANG
  • FANG PINTIAN
  • HAO WENMING
  • CHEN XIZHANG
  • PENG HUAIGANG
  • WU GAOSHU
  • WU SHANGZHE
  • ZHENG YIQIAN
  • ZHANG ZHIBING

Assignees

  • 方正阀门集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260403

Claims (10)

  1. 1. The ultra-low temperature high-performance self-compensating gate valve comprises a valve body (1), a valve cover (2), a valve rod (3) and a gate plate (4), wherein the valve cover (2) is arranged at the upper end of the valve body (1), a support (5) is arranged at the upper end of the valve cover (2), an actuating mechanism (6) is arranged on the support (5), the output end of the actuating mechanism (6) is connected with the valve rod (3) in a linkage manner, the support (5) and the valve cover (2) are respectively provided with an upper shaft hole (7) and a lower shaft hole (8), the valve rod (3) penetrates through the upper shaft hole (7) and the lower shaft hole (8) and stretches into the valve body (1) to be connected with the gate plate (4) in a linkage manner, a valve seat (9) used for forming sealing fit with the gate plate (4) when the valve is closed is arranged at the position of the inner wall of the valve body (1), the gate plate (4) comprises a gate plate frame (10), a wedge block (11), an adjusting ball (12) and two wedge blocks (13), the upper ends of the wedge block (11) are respectively provided with inverted T-shaped grooves (14) and inverted T-shaped grooves (15), the valve rod (3) lower extreme stretches into in the inverted T-shaped groove (14) and with valve rod nut (15) screw-thread fit, be equipped with guide channel (16) on flashboard frame (10), two flashboard bodies (13) symmetry set up in flashboard frame (10) both sides, be equipped with on flashboard body (13) and constitute sliding fit's guide body (17) with guide channel (16), be equipped with on guide body (17) with wedge (11) corresponding side matched with direction inclined plane (18), still be equipped with a plurality of locating parts (19) that are used for constituting the slip stroke spacing to flashboard body (13) on flashboard frame (10).
  2. 2. The ultra-low temperature high-performance self-compensating gate valve of claim 1, wherein the wedge block (11) comprises two symmetrically arranged half wedge bodies (20), opposite sides of the two half wedge bodies (20) are respectively provided with a hemispherical groove (21), left and right parts of the adjusting ball (12) are respectively arranged in the corresponding hemispherical grooves (21), the valve rod nut (15) is vertically movably arranged in the inverted T-shaped groove (14) under the driving of the valve rod (3), the periphery of the valve rod (3) is further provided with a limiting step (22), and a cup-shaped disc spring (23) is clamped between the limiting step (22) and the gate frame (10).
  3. 3. The ultra-low temperature high-performance self-compensating gate valve of claim 1, wherein the limiting piece (19) comprises a limiting rod (24) penetrating through the gate frame (10) and limiting nuts (25) connected with two ends of the limiting rod (24) in a threaded mode, a limiting flange (26) is arranged on the periphery of the gate body (13), and the limiting flange (26) is movably arranged between the gate frame (10) and the limiting nuts (25).
  4. 4. The ultra-low temperature high-performance self-compensating gate valve of claim 1, wherein the positions, corresponding to two sides of the gate plate (4), of the inner wall of the valve body (1) are respectively provided with a mounting groove (27) for mounting the valve seat (9), a first corrugated pipe assembly (28) is arranged in the mounting groove (27), one end of the first corrugated pipe assembly (28) is welded with the inner end of the mounting groove (27), the other end of the first corrugated pipe assembly (28) is welded with the valve seat (9), and a lip-shaped ring (29) used for forming sealing fit with the inner circular surface of the mounting groove (27) is further arranged on the outer circular surface of the valve seat (9).
  5. 5. The ultra-low temperature high performance self-compensating gate valve according to claim 1, wherein the valve rod (3) comprises an upper valve rod (30), an upper heat-insulating sleeve head (31), a heat-insulating sleeve (32), a lower heat-insulating sleeve head (33) and a lower valve rod (34), the upper heat-insulating sleeve head (31) and the lower heat-insulating sleeve head (33) are respectively connected with the upper end and the lower end of the heat-insulating sleeve (32) in a threaded manner, a plurality of vacuum check valves (35) which only allow medium in the heat-insulating sleeve (32) to be discharged outwards are arranged on the heat-insulating sleeve (32), the outer diameters of the upper heat-insulating sleeve head (31), the heat-insulating sleeve (32) and the lower heat-insulating sleeve head (33) are smaller than the inner diameter of the lower shaft hole (8), an upper guide ring (36) and a lower guide ring (37) which are respectively attached to the inner wall of the lower shaft hole (8) are respectively arranged on the peripheries of the upper heat-insulating sleeve head (31) and the lower heat-insulating sleeve head (33), the upper end and the lower end of the upper heat-insulating sleeve head (31) are in threaded engagement with the lower end of the upper sleeve (30) and then the lower end of the upper shaft pin (34) are in threaded engagement, and the lower end of the upper shaft pin (39) is fixed by the lower shaft pin.
  6. 6. The ultra-low temperature high-performance self-compensating gate valve of claim 5, further comprising a packing assembly (40) and a second bellows assembly (41), wherein the packing assembly (40) comprises a packing pressing plate (42), a packing pressing sleeve (43) and a sealing packing (44) which are sequentially sleeved on the periphery of the upper valve rod (30) from top to bottom, a sealing groove (45) is formed in the position, corresponding to the upper end of the upper shaft hole (7), of the support (5), the packing pressing plate (42) is connected with the valve cover (2) through a slipknot bolt (46), the packing pressing plate (42) acts on the packing pressing sleeve (43) to enable the packing pressing sleeve (43) to compress the sealing packing (44) in the sealing groove (45), the second bellows assembly (41) is sleeved on the periphery of the upper valve rod (30), the upper end of the second bellows assembly (41) is clamped between the support (5) and the valve cover (2), and the lower end of the second bellows assembly (41) is welded on the periphery of the upper valve rod (30).
  7. 7. The ultra-low temperature high-performance self-compensating gate valve of claim 6, further comprising a steam circulation sleeve (47), wherein a mounting cavity (48) is further arranged at the inner end of the sealing groove (45), a steam inlet (49) and a steam outlet (50) which are communicated with the mounting cavity (48) are formed in the outer wall of the bracket (5), the steam circulation sleeve (47) is arranged in the mounting cavity (48), the upper end of the steam circulation sleeve (47) stretches into the sealing groove (45), a sealing flange (51) is arranged at the periphery of the upper end of the steam circulation sleeve (47), a sealing gasket (52) is arranged between the lower end of the sealing flange (51) and the inner end of the sealing groove (45) and between the lower end of the steam circulation sleeve (47) and the inner end of the mounting cavity (48), an air inlet channel (53) and a backflow channel (54) which are distributed in a spiral mode are formed in the periphery of the steam circulation sleeve (47), and the upper end of the air inlet channel (53) and the upper end of the backflow channel (54) are connected with the steam inlet (49) and the lower end of the steam outlet (54) respectively.
  8. 8. The ultra-low temperature high-performance self-compensating gate valve of claim 1 is characterized in that a heat preservation sleeve (55) is further covered outside the valve body (1) and the valve cover (2), a pipeline heat preservation layer (56) is filled in the heat preservation sleeve (55), an isolation drip plate (57) is further arranged on the periphery of the valve cover (2) in a vertically movable mode, an isolation drip plate lower connecting sleeve (78) is welded at the upper end of the heat preservation sleeve (55), and the isolation drip plate (57) and the isolation drip plate lower connecting sleeve (78) are connected through an isolation drip plate telescopic sleeve (58).
  9. 9. The ultra-low temperature high performance self-compensating gate valve of claim 1, wherein a self-grinding assembly (59) is further arranged between the valve rod (3) and the valve cover (2), the self-grinding assembly (59) comprises a guide sleeve (60), a grinding sleeve (61), a driving ball (62), a limiting plug (63) and two bearings (64), the guide sleeve (60) is arranged in the valve cover (2), the inner diameter of the guide sleeve (60) is equal to the inner diameter of the lower shaft hole (8), the grinding sleeve (61) is arranged between the valve rod (3) and the guide sleeve (60), a plurality of grinding bevel teeth (65) for scraping attachments on the inner wall of the lower shaft hole (8) are uniformly distributed on the periphery of the upper end of the grinding sleeve (61), an isolation gap (66) is arranged between the grinding sleeve (61) and the valve rod (3), a positioning groove (67) is respectively formed in the position of the inner wall of the grinding sleeve (61) corresponding to the upper end and the lower end of the limiting plug (63), the outer ring of the bearing (64) is embedded in the corresponding positioning groove (67), the outer periphery of the valve rod (3) is correspondingly clamped with the inner ring (64) and the two bearings (68) are respectively abutted against the outer ring (68) of the corresponding to the upper end of the bearing (64), the novel grinding device is characterized in that a fixing hole (70) corresponding to the spiral guide groove (69) is formed in the side wall of the guide sleeve (60), one half of the driving ball (62) is arranged in the spiral guide groove (69), the other half of the driving ball is arranged in the fixing hole (70), the limiting plug (63) is in threaded connection with the outer end of the fixing hole (70) to limit the driving ball (62), an annular groove (71) is further formed in the inner wall of the guide sleeve (60), a plurality of blanking holes (72) which extend downwards obliquely and penetrate through the outer wall of the guide sleeve (60) are formed in the annular groove (71), the grinding sleeve (61) comprises a movable main body (73) and a grinding head (74) arranged at the upper end of the movable main body (73), grinding helical teeth (65) are arranged on the grinding head (74), an annular connecting portion (75) is arranged at the lower end of the grinding head (74), an annular connecting groove (76) is formed in the upper end of the movable main body (73), and the annular connecting portion (75) is matched with the annular connecting groove (76) and connected with the annular connecting groove (76) in a circumferential mode through a plurality of screws (77).
  10. 10. The ultra-low temperature high-performance self-compensating gate valve of claim 1, wherein the valve cover (2) and the valve body (1) are made of high-manganese austenitic alloy structural steel.

Description

Ultra-low temperature high-performance self-compensating gate valve Technical Field The invention relates to the technical field of valves, in particular to an ultralow-temperature high-performance self-compensating gate valve with stable operation. Background With the rapid development of modern industry, in particular aerospace, new energy (hydrogen energy), large natural gas liquefaction and storage, superconducting technology and leading-edge scientific experimental devices, there is an increasing need for valves that operate stably and reliably in ultra-low temperature (typically below-100 ℃, especially below-196 ℃) or even cryogenic (-253 ℃) environments. The gate valve is an important cut-off device in a pipeline system because of the advantages of small flow resistance, long opening and closing stroke, reliable sealing and the like. However, when the operating temperature falls to the ultra-low temperature range, the design of conventional valves and common cryogenic valves face a number of limiting challenges, and there are significant shortcomings in the prior art. The ultra-low temperature valve is used as a key control valve of a pipeline, and has important significance in sealing performance and performance stability. When the traditional gate valve is applied to low-temperature or ultralow-temperature working conditions, the following defects are overcome: (1) The metal seal has extremely high requirements on machining precision and assembly, is easy to damage when impurities exist, and the sealing pair is easy to generate stress deformation under ultralow temperature medium, so that the sealing is invalid. (2) And the valve rod sealing failure is that the valve rod of the traditional ultralow temperature valve adopts an lengthened structure, the gap of the lengthened pipe is frozen when the temperature of the filler is reduced to below zero under long-time heat exchange, and the sealing failure at the filler position of the valve rod is easy to cause leakage. (3) The valve body, the valve cover and the valve rod form a continuous metal 'heat bridge', so that external heat is continuously transmitted, medium gasification loss is caused, and serious frosting and icing are caused outside the valve. This not only increases the energy consumption, but also poses a threat to the safety of the operators, and frozen ice layers may also jam the operating mechanism. Therefore, it is necessary to improve the existing gate valve structure to ensure that the valve can stably operate under low temperature or ultra-low temperature working conditions. Disclosure of Invention The invention aims to provide an ultralow-temperature high-performance self-compensating gate valve, which can ensure the stable operation of the valve under the low-temperature or ultralow-temperature working condition, prevent the leakage of a low-temperature medium and the leakage of the low-temperature medium, and has important significance for the increasingly developed new energy market in the future. The ultra-low temperature high-performance self-compensating gate valve comprises a valve body, a valve cover, a valve rod and gate plates, wherein the valve cover is arranged at the upper end of the valve body, a support is arranged at the upper end of the valve cover, an actuating mechanism is arranged on the support, the output end of the actuating mechanism is in linkage connection with the valve rod, an upper shaft hole and a lower shaft hole are respectively arranged on the support and the valve cover, the valve rod penetrates through the upper shaft hole and the lower shaft hole and stretches into the valve body to be in linkage connection with the gate plates, a valve seat for forming sealing fit with the gate plates when the valve is closed is respectively arranged at the positions of the two sides of the inner wall of the valve body, the gate plates comprise a gate plate frame, a wedge block, an adjusting ball and two gate plate bodies, an inverted T-shaped groove is arranged at the upper end of the wedge block, a valve rod nut is arranged in the inverted T-shaped groove, the lower end of the valve rod stretches into the inverted T-shaped groove and is in threaded fit with the valve rod nut, guide channels are respectively arranged on the support and the two gate plate bodies are symmetrically arranged on the two sides of the gate plates, a guide body for forming sliding fit with the gate plate frame is respectively arranged on the two gate plate bodies, and a plurality of wedge blocks are correspondingly arranged on the side of the guide body for forming a limit stop piece. By adopting the technical scheme, the actuating mechanism operates to drive the valve rod and the wedge block to move downwards, the two flashboard bodies respectively generate a horizontal force through the inclined planes of the wedge block and the two flashboard bodies, the two flashboard bodies are respectively pressed onto the corresponding valve se