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CN-121719922-B - Corrugated pipe stop valve for phosgene pipeline

CN121719922BCN 121719922 BCN121719922 BCN 121719922BCN-121719922-B

Abstract

The invention belongs to the technical field of stop valves, and particularly relates to a corrugated pipe stop valve for a phosgene pipeline, which comprises a valve body, a valve seat, a valve cover assembly, a hollow valve rod and a hand wheel, wherein lifting threads matched with the valve cover assembly are formed on the outer wall of the hollow valve rod, a corrosion-resistant rubber valve core matched with the valve seat is fixedly sleeved at the bottom end of the hollow valve rod, an expansion cavity is formed in the corrosion-resistant rubber valve core, and the expansion cavity is communicated with an opening at the bottom of the hollow valve rod. The corrugated pipe stop valve for the phosgene pipeline has the functions of impact buffering, phosgene leakage prevention, real-time monitoring of seal failure and accurate alarm, has the function of multiple seals when the stop valve is closed, effectively improves the sealing effect and reliability of the stop valve, greatly improves the protective performance of the stop valve, prolongs the service life of the stop valve, effectively avoids safety accidents caused by a large amount of phosgene leakage, and can improve the safety and reliability of the operation of the phosgene pipeline.

Inventors

  • MAO CHUNLONG
  • MAO JINGEN
  • CHEN SHANJUN

Assignees

  • 江苏金晟元特种阀门股份有限公司

Dates

Publication Date
20260505
Application Date
20260213

Claims (5)

  1. 1. The utility model provides a bellows stop valve for phosgene line, includes valve body (1), disk seat (2), valve gap subassembly (3), hollow valve rod (4) and hand wheel (5), the outer wall of hollow valve rod (4) has seted up with valve gap subassembly (3) matched with lift screw thread, its characterized in that, the bottom fixed of hollow valve rod (4) has cup jointed corrosion-resistant rubber case (6) with disk seat (2) matched with, expansion cavity (10) have been seted up to the inside of corrosion-resistant rubber case (6), and expansion cavity (10) communicate with the opening of hollow valve rod (4) bottom; An air supply mechanism (7) is fixedly sleeved on the outer wall of the hollow valve rod (4); the outer wall of the valve body (1) is fixedly sleeved with a phosgene leakage-proof mechanism (8); The phosgene leakage-proof mechanism is characterized in that an outer cover (11) is fixedly connected to the outer wall of the phosgene leakage-proof mechanism (8), a first sealing bearing (12) is fixedly embedded in the top end of the outer cover (11), a connecting hose (13) is fixedly connected to the inner wall of the first sealing bearing (12), a threaded cap (14) for fixing a hand wheel (5) is fixedly communicated with the top end of the connecting hose (13), connecting threads matched with the threads of the inner wall of the threaded cap (14) are formed in the top end of the hollow valve rod (4), a normally closed electromagnetic valve (15) is fixedly communicated with the bottom end of the outer cover (11), and a branch pipe (16) is fixedly communicated with the bottom end of the normally closed electromagnetic valve (15); the outer wall of the outer cover (11) is fixedly connected with a seal failure alarm mechanism (9); The phosgene leakage prevention mechanism (8) comprises a protective shell (81) fixedly sleeved with the outer wall of the valve body (1), a fixed slot is formed in the top end of the protective shell (81), a sealing backing ring (82) is sleeved on the wall of the fixed slot, a top cover (83) is fixedly connected to the top end of the protective shell (81) through bolts, a corrosion-resistant rubber sealing cover (84) is fixedly connected to the inner wall of the top cover (83), a second sealing ring (85) is fixedly sleeved on the rod wall of the hollow valve rod (4), the outer wall of the second sealing ring (85) is fixedly connected with the inner wall of the top end of the corrosion-resistant rubber sealing cover (84), and the bottom end of the branch pipe (16) penetrates through the inner wall of the bottom end of the protective shell (81) and extends towards the inside of the protective shell (81); The bottom of the protective shell (81) is filled with an absorption liquid layer (17), the inner wall of the protective shell (81) is fixedly connected with a liquid guide block (18), openings matched with two ends of the valve body (1) are formed in the bottom end of the liquid guide block (18), and the bottom end of the liquid guide block (18) is located in the absorption liquid layer (17); The sealing failure alarm mechanism (9) comprises a fixed shell (91) fixedly connected with the outer wall of an outer cover (11), an audible-visual alarm (92) is fixedly connected with the outer wall of the fixed shell (91), a controller (93) is fixedly connected with the outer wall of the outer cover (11) located at the position of the fixed shell (91), two through holes are formed in the outer wall of the outer cover (11) located at the position of the fixed shell (91), and a gas pressure sensor (94) and a phosgene sensor (95) are fixedly connected with the hole walls of the two through holes.
  2. 2. The corrugated pipe stop valve for the phosgene pipeline according to claim 1, characterized in that the air supply mechanism (7) comprises a support ring (71) fixedly sleeved with the outer wall of the hollow valve rod (4), the outer wall of the support ring (71) is fixedly sleeved with a corrosion-resistant rubber sleeve (72), the bottom end of the corrosion-resistant rubber sleeve (72) is fixedly sleeved with the outer wall of the hollow valve rod (4), the top outer wall of the corrosion-resistant rubber sleeve (72) is in sealing sliding connection with the top inner wall of the valve body (1), the top inner wall of the valve body (1) is fixedly connected with an inclined plane extrusion ring (73) matched with the corrosion-resistant rubber sleeve (72), and an air inlet hole (74) is formed in the outer wall of the hollow valve rod (4) located at the corrosion-resistant rubber sleeve (72).
  3. 3. The corrugated pipe stop valve for the phosgene pipeline according to claim 1 is characterized in that a mounting through hole is formed in the side wall of the outer cover (11), and a one-way air inlet nozzle (19) is fixedly connected to the hole wall of the mounting through hole.
  4. 4. The corrugated pipe stop valve for the phosgene pipeline according to claim 1, wherein a sealing ring (20) is movably sleeved at the matching position of the hollow valve rod (4) and the threaded cap (14), and a gasket ring (21) is fixedly connected to the bottom end of the threaded cap (14).
  5. 5. The corrugated pipe stop valve for the phosgene pipeline according to claim 1 is characterized in that a fixed flange (22) matched with a valve cover assembly (3) is fixedly connected to the upper surface of the valve body (1), and a connecting flange (23) is fixedly connected to the inlet end and the outlet end of the valve body (1).

Description

Corrugated pipe stop valve for phosgene pipeline Technical Field The invention belongs to the technical field of stop valves, and particularly relates to a corrugated pipe stop valve for a phosgene pipeline. Background Phosgene is a colorless or yellowish gas, has strong pungent smell or asphyxia smell, is also an important organic intermediate, is a very active electrophile and is easy to hydrolyze, and a corrugated pipe is a pipeline for conveying liquid and gas, and is formed by a series of corrugations, the corrugations allow the pipeline to have higher elasticity when bearing certain pressure, and the special corrugated pipe stop valve for phosgene is mainly used for medium interception of a phosgene pipeline system, realizes pipeline on-off control through the opening and closing cooperation of a valve core and a valve seat, and is disclosed in the patent with patent number CN 222458369U. At present, in the actual use process of the special corrugated pipe stop valve for phosgene, the special corrugated pipe stop valve is subjected to continuous scour and abrasion of gas-liquid diphase phosgene, the damage defects of surface roughness rise, dimensional accuracy deviation and the like are easy to occur on the sealing surface of the valve core, the attaching tightness of the valve core and the valve seat is directly damaged, meanwhile, the traditional special corrugated pipe stop valve for phosgene generally lacks the real-time monitoring and alarming functions of valve core sealing failure, so that the phosgene leakage caused by sealing failure has extremely strong concealment, and the safety and reliability of valve operation are seriously reduced; In addition, when the existing special corrugated pipe stop valve for phosgene is operated under the working condition, the flow velocity of a gas-liquid dual-phase medium in a pipeline can be suddenly changed under the influence of fluctuation of phosgene conveying pressure and quick opening and closing of the valve, so that a gas hammer phenomenon is triggered, the inner structure of the stop valve can be damaged by frequent gas hammer impact pressure, the service life of the corrugated pipe stop valve for the phosgene pipeline is greatly shortened, and the stable operation of a phosgene pipeline system is seriously threatened. For this purpose, we propose a bellows stop valve for phosgene line to solve the above problems. Disclosure of Invention The invention aims to solve the problems and provide a corrugated pipe stop valve for a phosgene pipeline. The corrugated pipe stop valve for the phosgene pipeline comprises a valve body, a valve seat, a valve cover assembly, a hollow valve rod and a hand wheel, wherein the outer wall of the hollow valve rod is provided with lifting threads matched with the valve cover assembly, the bottom end of the hollow valve rod is fixedly sleeved with a corrosion-resistant rubber valve core matched with the valve seat, the inside of the corrosion-resistant rubber valve core is provided with an expansion cavity, and the expansion cavity is communicated with an opening at the bottom of the hollow valve rod; the outer wall of the hollow valve rod is fixedly sleeved with an air supply mechanism; the outer wall of the valve body is fixedly sleeved with a phosgene leakage-proof mechanism; The phosgene leakage-proof mechanism comprises a phosgene leakage-proof mechanism, a connecting hose, a connecting nut, a normally closed electromagnetic valve, a branch pipe and a connecting screw, wherein the outer cover is fixedly connected with the outer wall of the phosgene leakage-proof mechanism, a first sealing bearing is fixedly embedded in the top end of the outer cover, the connecting hose is fixedly connected with the inner wall of the first sealing bearing, the top end of the connecting hose is fixedly communicated with the screw cap for fixing a hand wheel, the top end of a hollow valve rod is provided with a connecting screw matched with the screw thread on the inner wall of the screw cap, the bottom end of the outer cover is fixedly communicated with the normally closed electromagnetic valve, and the bottom end of the normally closed electromagnetic valve is fixedly communicated with the branch pipe; and the outer wall of the outer cover is fixedly connected with a sealing failure alarm mechanism. In the bellows stop valve for phosgene pipeline, the air supply mechanism comprises a supporting ring fixedly sleeved with the outer wall of the hollow valve rod, the outer wall of the supporting ring is fixedly sleeved with a corrosion-resistant rubber sleeve, the bottom end of the corrosion-resistant rubber sleeve is fixedly sleeved with the outer wall of the hollow valve rod, the outer wall of the top end of the corrosion-resistant rubber sleeve is in sealing sliding connection with the inner wall of the top of the valve body, the inner wall of the top end of the valve body is fixedly connected with an inclined extrusion ring matched