CN102454813B - Multi-stream low-temperature pressure-relief throttling valve built in pipeline - Google Patents
Multi-stream low-temperature pressure-relief throttling valve built in pipeline Download PDFInfo
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- CN102454813B CN102454813B CN201110293057.1A CN201110293057A CN102454813B CN 102454813 B CN102454813 B CN 102454813B CN 201110293057 A CN201110293057 A CN 201110293057A CN 102454813 B CN102454813 B CN 102454813B
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Abstract
The invention relates to the technology of a multi-stream low-temperature pressure-relief throttling valve built in a pipeline for a minus 200 DEG C low temperature system, wherein the multi-stream low-temperature pressure-relief throttling valve is built in the pipeline by a locating mechanism and dispenses with flange or thread connection, so that the purposes of sealing-free and leak-tightness pipeline transportation and process control for multi-stream low-temperature fluid are achieved, the problem that the pipeline leakage of the low-temperature fluid in the pipeline is caused by sealing face damage due to easily sudden change of a low-temperature high-pressure working condition is solved, and the problems of vibrations and noises generated in a single-stream throttling and refrigerating pressure relief process are solved. The multi-stream low-temperature pressure-relief throttling valve is suitable for the pressure relief and throttling refrigerating process of the low-temperature fluid in the pipeline, the low-temperature fluid pressure and temperature control in the pipeline is facilitated, so that a low-temperature phase-change transport process is kept stable relatively, and the throttling and refrigerating efficiency is obviously increased. The multi-stream low-temperature pressure-relief throttling valve disclosed by the invention can also be used for solving the technical problem brought by dynamic phase-change refrigeration of the low-temperature fluid in the pipeline with variable pressure, variable temperature and variable flow, and increasing the phase-change refrigeration efficiency of the low-temperature fluid in the pipeline so as to effectively manage the low-temperature fluid.
Description
Technical field
The present invention relates to a kind of-200 ℃ cryogenic system multi-stream low-temperature pressure-relief throttling valve built in pipeline technology, being about to multi-stream low-temperature pressure-relief throttling valve is built in pipeline by positioning means, without flange or be threaded, realizing multiple flow cryogen transports and process control object without leakage pipe without sealing, thereby solved cryogen in pipeline and caused pipe leakage problem because the easy sudden change of cryogenic high pressure operating mode causes sealing surface destruction, and vibration and the noise problem in sub-thread stream throttling refrigeration decompression process, brought, be applicable to decompression and the throttling refrigeration process of cryogen in pipeline, be conducive to cryogenic fluid pressure and temperature control in pipeline, low temperature phase change transport process is kept relative stability, throttling refrigeration efficiency significantly improves.The present invention also can be used for solving the technical barrier that in the pipeline of transformation, alternating temperature, variable-flow, flow cryogen dynamic phase trasnsition refrigeration is brought greatly, improves the freezing by change of state efficiency of cryogen in pipeline, realizes effective management of pipeline cryogen.
Background technique
In general cryogenic refrigerating system, as low temperature fields such as LNG Liquefied natural gas (LNG), gas separation and liquefaction, conventional process control valve One's name is legion in set technique flow process, there are pressure controlled valve, heat-operated valve, refrigeration throttle valve and a large amount of low-temperature switch valve etc., be indispensable capital equipment in set technique equipment, and generally all adopt flange or be threaded, sub-thread stream flow process.Easily there is low-temperature brittle fracture in the sealing material being connected with pipeline under worst cold case, leaking often appears in sealing surface, have very large potential safety hazard, especially for flammable explosive gas, the danger that leakage causes is larger, simultaneously in decompression throttling refrigeration process, conventional sub-thread stream decompression throttle style exists ocsillator strenght large, and noise is large, and flow is little, restriction effect is poor, the shortcoming such as after throttling gaseous phase partial pressure is low.In addition, process control is equipped in reducing pressure by regulating flow process can produce strong vibration, very easily causes link seal leakage, and life of valve reduces, as throttle valve relies on vibration completely, could produce refrigeration effect etc., and strong dither easily causes valve body parts to crack.The cryogen temperature transporting in pipeline and pressure very easily cause overheated boiling and produce multiphase flow, cause temperature and pressure generation drastic change in pipeline, so the process control valve being connected with pipeline must possess following primary condition: can bear violent pressure and temperature instantaneous variation process; Valve link sealing surface is the least possible, and fluid leakage is the least possible; Pipeline can bear violent vibration, and link does not come off, and does not leak; Throttle valve for throttling refrigeration and low-temperature liquefaction must produce throttling refrigeration effect, effectively throttling multiphase flow; Reduction valve palpus stable control process pressure can play the effect of safety valve in the situation that of pressure jump; In decompression throttling process, reduce as far as possible vibration, but do not affect throttling refrigeration process; Flow is large as far as possible, improves the rate of gasification after liquid phase throttling; Chock pressure difference is large as far as possible, to reduce low temperature warm area etc.The present invention is directed to the sub-thread stream seal leakage problem existing in the interior cryogen process control of pipeline and transport process, cryogenic system multi-stream low-temperature pressure-relief throttling valve built in pipeline is proposed, the pressure meeting while transporting in cryogen pipeline is controlled and throttling refrigeration problem, make cryogen transport and process of refrigerastion in possess without sealing, without leaking, vibrate little, sound low noise, flow is large, the features such as warm area is low, minimizing is due to transformation, the unstable system pressure sudden change problem causing of alternating temperature outlet and fluid density, finally realizing cryogen transports and process control object without leaking high efficiency.Multi-stream low-temperature pressure-relief throttling valve built in pipeline in cryogen filling or system starting process to excess refrigerant further gasify swell refrigeration, further diffusion keep that overall structure is stable, overall pressure reasonable layout has important function equally.
Summary of the invention
The present invention is according to cryogen multiple flow transport process control technique feature in pipeline, invented multi-stream low-temperature pressure-relief throttling valve built in pipeline, the technical barrier bringing for solving the cry-fluid flow discharge of the pipeline refrigeration process of transformation, alternating temperature, variable-flow, reduce leakage problem, vibration problem, noise problem and flow minor issue in cryogen transport process, improve cryogen process control and freezing by change of state efficiency in pipeline, realize the relatively stable of the interior safety relief of cryogen pipeline and throttling refrigeration process.
Technical solution of the present invention:
Multi-stream low-temperature pressure-relief throttling valve built in pipeline is mainly comprised of gland 1, front band 2, valve body 3, bracing ring 4, pipeline 5, pin rod 6, pin rod clip 7, valve rod 8, spring 9, lower catch hoop 10, and described valve rod 8 screw top connect gland 1; Gland 1 is installed in valve body 3; Valve body 3 is fixed in pipeline 5 by front band 2 and lower catch hoop 10; Pin rod 6 is through gland 1 and valve rod 8 preformed holes; Pin rod clip 7 is installed in gland 1 draw-in groove; Gland 1 and the middle mounting spring 9 of bracing ring 4; Spring 9 centers are valve rod 8; The spring 9 pretension valve rod 8 bottom spool conical surfaces and valve body 3 bottom diffusion inner cavity surfaces form sealing surface.
When pipeline inner high voltage hydrodynamic pressure is greater than spring 9 pretightening force, fluid is through gland 1 inlet hole, valve body 3 cylinders, bracing ring 4 inlet holes and flow downward to cylindrical space under valve body 3 bottoms, compressing valve rod 8 drives gland 1 Compress Spring 9 and moves downward, after valve rod 8 bottom spools and valve body 3 flaring chamber reducing pressure by regulating flows, leave valve, realize the interior multiple flow decompression of cryogen pipeline 5 throttling refrigeration effect.
The Principle Problems that scheme is related:
Under-200 ℃ of worst cold cases, due to atmosphere environment not section heat is provided, in low temperature conveying pipe, cryogen is in saturated or superheat state, very easily produce multiphase flow, multiphase flow very easily causes overheated boiling or subcooled boiling, make cryogen in fierce phase transition process and be attended by pressure and temperature jump, constantly producing a large amount of saturated vapors, superheated vapor, saturated liquids, super-heated liquid etc.Cryogen is in pipeline transportation process, system pressure and difficult control of temperature, freezing by change of state process is complicated and changeable, cryogen temperature and pressure acute variation in pipeline, joint flange seal part or the spiral seal material of pipeline and process control valve are very easily destroyed, cause cryogen in pipeline to be leaked, produce great potential safety hazard.In pipeline, during cryogen decompression throttling refrigeration, judder will cause life of valve to reduce, and process control noise increases, and conduit seals is easily damaged, and flow reduces, and rate of gasification reduces, and refrigerating capacity decreases etc.The present invention applies emphatically built in pipeline gate principle, throttling differential refrigeration effect, prestressing force equilibrium principle, large flow multiple flow noise reduction, increases effective management process that the principles such as rate of gasification realize cryogen.First, by valve installation in pipeline and realize chilling process control valve built in pipeline.Because Subzero valve is installed in pipeline, appearance is without link, without sealing, without leaking, and integrated piping does not interrupt continuously, and pipeline junction, without sealing surface, seals destructible, the easy leakage problem of system thereby solved cryogen pipe joint.Meanwhile, pipeline is outward plain tube, cannot see the installation vestige of valve in pipeline, makes process control technological process simpler, and external device management is convenient.Secondly, application throttling differential effect, by built in pipeline throttle valve control pipeline cryogenic system temperature, can produce throttling refrigeration effect and export cold, and making fluid temperature (F.T.) is required control temperature.Then, application prestressing force equilibrium principle, makes working pressure in the prestressing force of spring under worst cold case and pipeline reach balance, valve open expenditure and pressure when pipeline pressure reaches spring prestressing force, and pipeline pressure reduction late gate is closed automatically.In addition, can control low pressure in cryogenic system by the mechanism of decompressor is the required pilot pressure of fluid, and when manifold pressure reaches system allowable pressure, reduction valve can be opened automatically, and while being less than allowable pressure, valve closing, realizes level pressure with this and control object.Finally, with the large flow throttle style of multiple flow, replace sub-thread stream mode, the shortcomings such as while overcoming the throttling of sub-thread expenditure and pressure, flow is little, rate of gasification is low, vibration is large, noise is large, seal rapid wear, refrigerating efficiency is low, application multiple flow flow is large, rate of gasification is high, it is little to vibrate, noise is little, refrigerating efficiency is high, life of valve is long, sealing is not easy the advantages such as destruction, realizes cryogen in pipeline and leaks multiply step-down and throttling refrigeration object without sealing nothing.This technology also can be applicable to the gasification peak regulation pressurization of decompression process and the cryogenic liquide of pressurized gas under normal temperature.
Technical characterstic of the present invention:
For cryogen process control problem in pipeline, multi-stream low-temperature pressure-relief throttling valve built in pipeline can meet pipeline cryogenic fluid pressure and temperature control requirement, realize in cryogen pipeline and leak transport process without sealing, nothing, can make full use of throttling cold in pipeline, realize cryogen high low pressure in pipeline and control object, and decompression and throttling refrigeration double utility; Built in pipeline pressure reducing throttle valve is throttling saturated vapour, saturated fluid, overcooled liquid, super-cooled steam and multiphase flow effectively, makes the system can safety relief throttling refrigeration, realizes effective management of pipeline cryogen; The multiple flow control procedure flow that flows is large, and rate of gasification is high, vibrates littlely, and noise is little, and refrigerating efficiency is high, seals survivablely, and life of valve is long; Built in pipeline pressure reducing throttle valve adopts built in pipeline valve design mode, easy for installation, overcome the seal leakage shortcoming of flange-type in the past or screw connected valve, save material and reduced again loaded down with trivial details installation process, effectively saved technological process space, for site technique workflow management has brought convenience.
Accompanying drawing explanation
Figure 1 shows that critical piece and the mounting point relation of multi-stream low-temperature pressure-relief throttling valve built in pipeline.
Embodiment
Correcting spring 9 prestressing force under worst cold case, make spring 9 prestressing force consistent with pipeline 5 working pressures; Intercepting part pipe laying 5 at the upper and lower twice draw-in groove of the interior processing of pipeline 5, in pipeline 5, then installs clip 2 and lower catch hoop 10 by the good valve installation of manufacturing; Adjusting pipeline low voltage control pressure is corresponding fluid operating pressure; Already installed pipeline 5 is welded in process pipe; If pipeline 5 working pressures surpass allowable pressure, pressure reducing throttle valve low voltage terminal is automatically opened with throttle style pressure release and is produced throttling refrigeration effect, and when system pressure is during lower than working pressure, valve is closed automatically.
Detailed process is as described below:
Slowly open cryogenic piping 5 main switch valves, apply a small amount of cryogen precooling pressure reducing throttle valve critical piece, after precooling completes, system pressure increases, cryogen enters in pressure reducing throttle valve valve body 3 cylinders, and when pressure reaches and is greater than spring 9 pretightening force, compressing valve rod 8 drives gland 1 Compress Spring 9 and moves downward, after valve rod 8 bottom spools and valve body 3 flaring chamber reducing pressure by regulating flows, leave valve, realize cryogen pipeline 5 interior without the leakage multiple flow step-down of sealing nothing and throttling refrigeration effect.
Claims (4)
1. a multi-stream low-temperature pressure-relief throttling valve built in pipeline, mainly by gland (1), front band (2), valve body (3), bracing ring (4), pipeline (5), pin rod (6), pin rod clip (7), valve rod (8), spring (9), lower catch hoop (10), formed, it is characterized in that: described valve rod (8) screw top connects gland (1); Gland (1) is installed in valve body (3); Valve body (3) is fixed in pipeline (5) by front band (2) and lower catch hoop (10); Pin rod (6) is through gland (1) and valve rod (8) preformed hole; Pin rod clip (7) is installed in gland (1) draw-in groove; Gland (1) and the middle mounting spring (9) of bracing ring (4); Spring (9) center is valve rod (8); Spring (9) pretension valve rod (8) the bottom spool conical surface and valve body (3) bottom diffusion inner cavity surface form sealing surface; Gland (1) is axially symmetric structure, and center has screw, and top is conical, and conical lower portion is cylindrical, and cylinder has annular slot, has horizontal preformed hole in draw-in groove; Pin rod (6) is fixed in the draw-in groove of gland (1) top by annular pin rod clip (7) after passing gland (1) and valve rod (8) preformed hole, valve rod (8) is threaded firmly loosening with gland (1); Gland (1) middle cone has inlet hole, and center is annular hollow structure, and cylndrical surface, bottom and valve body (3) cylinder Cylindrical Surfaces Contact also can slide up and down; Valve body (3) is the symmetrical hollow cylindrical structure of integral shaft, outer cylinder and pipeline (5) internal surface is fitted completely, upper horizontal circle anchor ring contacts with front band (2) bottom surface, lower horizontal circle anchor ring contacts with lower catch hoop (10) upper horizontal plane, a plurality of cylinders are left at center, and each cylinder top is that tapered configuration, centre are that two sections of cylindrical cylinder, bottom are flaring structure; Gland (1), spring (9), valve rod (8), bracing ring (4) assembly are all installed in each cylinder; Gland (1) is installed at center, convergent chamber, top, mounting spring (9), bracing ring (4) in upper cylindrical cylinder, and lower cylindrical cylinder is voltage stabilizing passage before throttling; Center, flaring chamber, bottom is valve rod (8) spool, and on spool, the conical surface and the cylinder flaring chamber conical surface form sealing surface.
2. multi-stream low-temperature pressure-relief throttling valve built in pipeline according to claim 1, it is characterized in that: bracing ring (4) is the symmetrical hollow cylindrical structure of integral shaft, the tight note of outer cylinder and valve body (3) cylinder surfaces closes, circular horizontal plane top has center hole and around the inlet hole of center hole, center hole internal surface contacts with valve rod (8) outer surface, in order to stablize valve rod (8).
3. multi-stream low-temperature pressure-relief throttling valve built in pipeline according to claim 1, it is characterized in that: pipeline (5) inwall has the upper draw-in groove of annular and lower bayonet slot, valve body (3) is installed between draw-in groove, in upper draw-in groove and lower bayonet slot, install respectively clip (2) and lower catch hoop (10), front band (2) is above is fluid high-pressure district, and lower catch hoop (10) is following is fluid low-temp low-pressure district.
4. multi-stream low-temperature pressure-relief throttling valve built in pipeline according to claim 1, it is characterized in that: when pipeline inner high voltage hydrodynamic pressure is greater than spring (9) pretightening force, fluid is through gland (1) inlet hole, valve body (3) cylinder, bracing ring (4) inlet hole also flows downward to the lower cylindrical space in valve body (3) bottom, compressing valve rod (8) drives gland (1) Compress Spring (9) and moves downward, after valve rod (8) bottom spool and valve body (3) flaring chamber reducing pressure by regulating flow, leave valve, realize the interior multiple flow decompression of cryogen pipeline (5) throttling refrigeration effect.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110293057.1A CN102454813B (en) | 2011-10-07 | 2011-10-07 | Multi-stream low-temperature pressure-relief throttling valve built in pipeline |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110293057.1A CN102454813B (en) | 2011-10-07 | 2011-10-07 | Multi-stream low-temperature pressure-relief throttling valve built in pipeline |
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| Publication Number | Publication Date |
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| CN102454813A CN102454813A (en) | 2012-05-16 |
| CN102454813B true CN102454813B (en) | 2014-04-23 |
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| CN105299280B (en) * | 2015-10-26 | 2017-10-13 | 徐州工业职业技术学院 | A kind of explosion-proof low noise flow control valve |
| CN110886851A (en) * | 2019-12-25 | 2020-03-17 | 艾坦姆流体控制技术（北京）有限公司 | Satisfy governing valve that bubble level let out leakage quantity under hard seal |
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| EP0689015A1 (en) * | 1994-06-21 | 1995-12-27 | Staefa Control System Scs Ag | Control valve with actuating drive |
| CN201428840Y (en) * | 2009-04-26 | 2010-03-24 | 张周卫 | Double-pressure control pressure relief throttle valve |
Family Cites Families (3)
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|---|---|---|---|---|
| JPH07286679A (en) * | 1994-04-14 | 1995-10-31 | Hikari Gokin Seisakusho:Kk | Hot water mixing valve |
| US20030047216A1 (en) * | 2001-09-07 | 2003-03-13 | Kelly Paul A. | Pop-type pressure relief valve |
| JP2007139016A (en) * | 2005-11-16 | 2007-06-07 | Saginomiya Seisakusho Inc | Electric motor-driven type control valve and refrigerating cycle device |
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2011
- 2011-10-07 CN CN201110293057.1A patent/CN102454813B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0689015A1 (en) * | 1994-06-21 | 1995-12-27 | Staefa Control System Scs Ag | Control valve with actuating drive |
| CN201428840Y (en) * | 2009-04-26 | 2010-03-24 | 张周卫 | Double-pressure control pressure relief throttle valve |
Non-Patent Citations (4)
| Title |
|---|
| JP特开2007-139016A 2007.06.07 |
| JP特开平7-286679A 1995.10.31 |
| 双压控制减压节流阀的数值模拟及试验;张周卫等;《机械工程学报》;20101130;第46卷(第22期);第130-135页 * |
| 张周卫等.双压控制减压节流阀的数值模拟及试验.《机械工程学报》.2010,第46卷(第22期),第130-135页. |
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