CN102454813A - 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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- CN102454813A CN102454813A CN2011102930571A CN201110293057A CN102454813A CN 102454813 A CN102454813 A CN 102454813A CN 2011102930571 A CN2011102930571 A CN 2011102930571A CN 201110293057 A CN201110293057 A CN 201110293057A CN 102454813 A CN102454813 A CN 102454813A
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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 ℃ of cryogenic systems with the built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve technology; Being about to multiple flow low-temperature reduced-pressure throttle valve is built in the pipeline through positioning means; Need not flange or be threaded; Realize that the multiple flow cryogen do not have the no leakage pipe of sealing and transport and the process control purpose, thereby solved cryogen in the pipeline, and sub-thread flows vibration and the noise problem of bringing in the throttling refrigeration decompression process because the cryogenic high pressure operating mode is prone to sudden change causes that sealing surface destroys and cause the pipe leakage problem; Be applicable to the decompression and the throttling refrigeration process of cryogen in the pipeline; Help cryogenic fluid pressure and temperature control in the pipeline, the low temperature phase change transport process is kept relative stability, throttling refrigeration efficient significantly improves.The present invention also can be used for solving the technical barrier that big flow cryogen dynamic phase trasnsition refrigeration is brought in the pipeline of transformation, alternating temperature, unsteady flow amount, improves the freezing by change of state efficient of cryogen in the pipeline, realizes effective management of pipeline cryogen.
Background technique
In general cryogenic refrigerating system; Like low temperature fields such as LNG Liquefied natural gas (LNG), gas separation and liquefaction; Commonly used process control valve One's name is legion in the set technique flow process has pressure controlled valve, heat-operated valve, refrigeration throttle valve and a large amount of low-temperature switch valve etc., is indispensable capital equipment in the set technique equipment; And generally all adopt flange or be threaded sub-thread stream flow process.Low-temperature brittle fracture appears in sealing material easily that under worst cold case, be connected with pipeline, and leaking often appears in sealing surface, has very big potential safety hazard; Especially for flammable explosive gas, the danger that leakage causes is bigger, simultaneously in decompression throttling refrigeration process; Sub-thread stream decompression throttle style commonly used exists ocsillator strenght big, and noise is big, and flow is little; Restriction effect is relatively poor, shortcoming such as gaseous phase partial pressure is low after the throttling.In addition; Process control is equipped in the throttling step-down process can produce strong vibration, very easily causes the link seal leakage, and life of valve reduces; Rely on vibration could produce refrigeration effect etc. fully like throttle valve, and strong dither cause valve body parts to crack easily.Cryogen temperature that transports in the pipeline and pressure very easily cause overheated boiling and produce multiphase flow; Cause temperature and pressure generation drastic change in the pipeline, so the process control valve that is 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 escape of liquid is the least possible; Pipeline can bear violent vibration, and link does not come off, and does not leak; The throttle valve that is used 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 under the situation of pressure jump; Reduce vibration as far as possible in the decompression throttling process, but do not influence the throttling refrigeration process; Flow is big as far as possible, the rate of gasification after the throttling of raising liquid phase; Chock pressure difference is big as far as possible, to reduce low temperature warm area etc.The present invention is directed to the sub-thread stream seal leakage problem that exists in interior cryogen process control of pipeline and the transport process; Cryogenic system is proposed with the built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve; Satisfy pressure control and throttling refrigeration problem when transporting in the cryogen pipeline; Make cryogen transport and process of refrigerastion in possess do not have sealing, do not have leak, characteristics such as vibration is little, sound low noise, flow is big, warm area is low; Reduce because the system pressure sudden change problem that transformation, alternating temperature outlet and fluid density instability cause, realize that finally cryogen do not have the high efficiency of leakage and transport and the process control purpose.The built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve in cryogen filling or system's starting process to excess refrigerant further gasify swell refrigeration, further diffusion and keep that overall structure is stable, the reasonable distribution of overall pressure has important function equally.
Summary of the invention
The present invention is according to cryogen multiple flow transport process control technique characteristics in the pipeline; Invented the built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve; Be used for solving the technical barrier that the cry-fluid flow discharging of the pipeline refrigeration process of transformation, alternating temperature, unsteady flow amount brings; Reduce leakage problem, vibration problem, noise problem and flow minor issue in the cryogen transport process; Improve cryogen process control and freezing by change of state efficient in the pipeline, realize the relatively stable of interior safety relief of cryogen pipeline and throttling refrigeration process.
Technical solution of the present invention:
The built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve mainly is made up 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 6, and said valve rod 8 screw top connect gland 1; Gland 1 is installed in the valve body 3; Valve body 3 is fixed in the pipeline 5 through front band 2 and lower catch hoop 10; Pin rod 6 passes gland 1 and valve rod 8 preformed holes; Pin rod clip 7 is installed in gland 1 draw-in groove; Gland 1 and bracing ring 4 middle mounting spring 9; Spring 9 centers are valve rod 8; Spring 9 pretension valve rods, the 8 bottom spool conical surfaces and valve body 3 bottom diffusion inner cavity surfaces form sealing surface.
When pipeline inner high voltage hydrodynamic pressure during greater than spring 9 pretightening forces; Fluid is through gland 1 inlet hole, valve seat 3 cylinders, bracing ring 4 inlet holes and flow downward to cylindrical space under valve seat 3 bottoms; Compressing valve rod 8 drives gland 1 pressure spring 9 and moves downward; After valve rod 8 bottom spools and valve seat 3 flaring chamber throttling step-downs, leave valve, realize multiple flow decompression throttling refrigeration effect in the cryogen pipeline 5.
The problems of principle that scheme is related:
Under-200 ℃ of worst cold cases; Because atmosphere environment not section provides heat; Cryogen is in saturated or superheat state in the low temperature conveying pipe, very easily produces multiphase flow, and multiphase flow very easily causes overheated boiling or subcooled boiling; Make cryogen be in fierce phase transition process and be attended by pressure and temperature jump, constantly produce a large amount of saturated vapors, superheated vapor, saturated liquids, super-heated liquid etc.Cryogen is in the pipeline transportation process; System pressure and difficult control of temperature; The freezing by change of state process is complicated and changeable, and cryogen temperature and pressure acute variation are very easily destroyed the joint flange seal spare of pipeline and process control valve or spiral seal material in the pipeline; Cause cryogen leakage in the pipeline, produce great potential safety hazard.When in the pipeline during cryogen decompression throttling refrigeration, judder will cause life of valve to reduce, and the process control noise increases, and conduit seals is damaged easily, and flow reduces, and rate of gasification reduces, and refrigerating capacity decreases etc.The present invention uses the valve-embedded principle of pipeline, throttling differential refrigeration effect, prestressing force equilibrium principle, big flow multiple flow noise reduction emphatically, increases effective management process of principle realization cryogens such as rate of gasification.At first, be installed on valve in the pipeline and realize that chilling process control valve pipeline is built-in.Because Subzero valve is installed in the pipeline, appearance does not have link, nothing sealing, does not have and leak, and integrated piping does not interrupt continuously, and pipeline junction does not have sealing surface, thereby has solved cryogen pipe joint sealing destructible, the easy leakage problem of system.Simultaneously, pipeline is outward a plain tube, can't see the installation vestige of valve in the pipeline, makes the process control technological process simpler, and external device management is convenient.Secondly, use the throttling differential effect, through the built-in throttle valve control pipeline of pipeline cryogenic system temperature, can produce the throttling refrigeration effect and export cold, making fluid temperature (F.T.) is required control temperature.Then, use the prestressing force equilibrium principle, make that working pressure reaches balance in prestressing force and the pipeline of spring under worst cold case, valve open and expenditure and pressure when pipeline pressure reaches spring prestressing force, pipeline pressure reduction late gate is closed automatically.In addition, can control that low pressure is the required pilot pressure of fluid in the cryogenic system through the mechanism of decompressor, when manifold pressure reached system's allowable pressure, reduction valve can be opened automatically, and during less than allowable pressure, valve closing is realized level pressure control purpose with this.At last; Replace sub-thread stream mode with the big flow throttle style of multiple flow; Shortcomings such as flow is little when overcoming the throttling of sub-thread expenditure and pressure, rate of gasification is low, vibration is big, noise is big, seal rapid wear, refrigerating efficiency is low; Application multiple flow flow is big, rate of gasification is high, vibration is little, noise is little, refrigerating efficiency is high, life of valve is long, sealing is not easy advantages such as destruction, and the interior cryogen of realization pipeline does not have the sealing nothing and leaks multiply step-down and throttling refrigeration purpose.This technology also can be applicable to the gasification peak regulation pressurization of the decompression process and the cryogenic liquide of pressurized gas under the normal temperature.
Technical characterstic of the present invention:
To cryogen process control problem in the pipeline; The built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve can satisfy pipeline cryogenic fluid pressure and temperature control requirement; Realize not having sealing in the cryogen pipeline, not having the transport process of leakage; Can make full use of throttling cold in the pipeline, realize cryogen high low pressure control purpose in the pipeline, and decompression and throttling refrigeration double utility; The built-in decompression throttle valve of pipeline is throttling saturated vapour, saturated fluid, overcooled liquid, super-cooled steam and multiphase flow effectively, makes the system can safety relief and throttling refrigeration, realizes effective management of pipeline cryogen; It is big that the multiple flow FLOW CONTROL is crossed range of flow, and rate of gasification is high, vibrate for a short time, and noise is little, and the refrigerating efficiency height seals survivablely, and life of valve is long; The built-in decompression throttle valve of pipeline adopts the valve-embedded design of pipeline; Easy for installation; Overcome the seal leakage shortcoming of flange-type in the past or screw connected valve; Promptly save material and reduced loaded down with trivial details installation process again, effectively practiced thrift the technological process space, for on-the-spot technological process management has brought convenience.
Description of drawings
Shown in Figure 1 is the critical piece and the mounting point relation of the built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve.
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 is also processed twice draw-in groove up and down in pipeline 5, the valve that manufacturing is good is installed in the pipeline 5, installs clip 2 and lower catch hoop 10 again; Adjustment pipeline low voltage control pressure is corresponding fluid operating pressure; Already installed pipeline 5 is welded in the process pipe; If pipeline 5 working pressures surpass allowable pressure, the throttle valve low voltage terminal that then reduces pressure is opened with the throttle style pressure release automatically and is produced the throttling refrigeration effect, and when system pressure was lower than working pressure, valve was closed automatically.
Detailed process is described below:
Slowly open cryogenic piping 5 main switch valves, use a small amount of cryogen precooling decompression throttle valve critical piece, after precooling is accomplished; System pressure increases; Cryogen gets in decompression throttle valve valve body 3 cylinders, and pressure reaches and during greater than spring 9 pretightening forces, compressing valve rod 8 drives gland 1 pressure springs 9 and also moves downward; After valve rod 8 bottom spools and valve body 3 flaring chamber throttling step-downs, leave valve, realize not having in the cryogen pipeline 5 sealing and do not have the multiple flow step-down of leakage and throttling refrigeration effect.
Claims (6)
1. the built-in multiple flow low-temperature reduced-pressure of pipeline throttle valve; Mainly be made up 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 (6), it is characterized in that: said valve rod (8) screw top connects gland (1); Gland (1) is installed in the valve body (3); Valve body (3) is fixed in the pipeline (5) through front band (2) and lower catch hoop (10); Pin rod (6) passes 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.
2. according to claim
1The built-in multiple flow low-temperature reduced-pressure of described pipeline throttle valve is characterized in that: gland (1) is an axially symmetric structure, and the center has screw, and the top is conical, and conical lower portion is cylindrical, and cylinder has annular slot, and horizontal preformed hole is arranged in the 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, and it is firmly not loosening that valve rod (8) is threaded with gland (1); Gland (1) middle cone has inlet hole, and the center is an annular hollow structure, and the cylndrical surface, bottom contacts with valve body (3) cylinder cylndrical surface and can slide up and down.
3. according to claim
1The built-in multiple flow low-temperature reduced-pressure of described pipeline throttle valve; It is characterized in that: bracing ring (4) is integral shaft symmetry hollow cylindrical structure; The tight card of outer cylinder and valve body (3) cylinder surfaces closes; The circular horizontal plane top has center hole and centers on the inlet hole of center hole, and the center hole internal surface contacts to stablize valve rod (8) with valve rod (8) outer surface.
4. according to claim
1The built-in multiple flow low-temperature reduced-pressure of described pipeline throttle valve; It is characterized in that: valve body (3) is integral shaft symmetry hollow cylindrical structure; Outer cylinder and pipeline (5) internal surface is fitted fully, and last horizontal circle anchor ring contacts with front band (2) bottom surface, and following horizontal circle anchor ring contacts with lower catch hoop (10) upper horizontal plane; A plurality of cylinders are left at the center, and each cylinder top is that tapered configuration, centre are that two sections cylindrical cylinder, bottom are the flaring structure; Gland (1), spring (9), valve rod (8), bracing ring (4) assembly all are installed in each cylinder; Gland (1) is installed at center, convergent chamber, top, mounting spring (9), bracing ring (4) in the last cylindrical cylinder, and following cylindrical cylinder is a voltage stabilizing passage before the throttling; Center, flaring chamber, bottom is valve rod (a 8) spool, and the conical surface and the cylinder flaring chamber conical surface form sealing surface on the spool.
5. according to claim
1The built-in multiple flow low-temperature reduced-pressure of described pipeline throttle valve; It is characterized in that: pipeline (5) inwall has annular and goes up draw-in groove and lower bayonet slot; Valve body (3) is installed between the draw-in groove; Install clip (2) and lower catch hoop (10) in last draw-in groove and the lower bayonet slot respectively, front band (2) is above to be the fluid high-pressure district, is fluid low-temp low-pressure district below the lower catch hoop (10).
6. according to claim
1The built-in multiple flow low-temperature reduced-pressure of described pipeline throttle valve; It is characterized in that: when pipeline inner high voltage hydrodynamic pressure during greater than spring (9) pretightening force; Fluid is through gland (1) inlet hole, valve seat (3) cylinder, bracing ring (4) inlet hole and flow downward to valve seat (3) bottom cylindrical space down; Compressing valve rod (8) drives gland (1) pressure spring (9) and moves downward; After valve rod (8) bottom spool and valve seat (3) flaring chamber throttling step-down, 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 |
Applications Claiming Priority (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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102454813A true CN102454813A (en) | 2012-05-16 |
| CN102454813B CN102454813B (en) | 2014-04-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110293057.1A Expired - Fee Related CN102454813B (en) | 2011-10-07 | 2011-10-07 | Multi-stream low-temperature pressure-relief throttling valve built in pipeline |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299280A (en) * | 2015-10-26 | 2016-02-03 | 徐州工业职业技术学院 | Novel type 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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| JPH07286679A (en) * | 1994-04-14 | 1995-10-31 | Hikari Gokin Seisakusho:Kk | Hot water mixing valve |
| EP0689015A1 (en) * | 1994-06-21 | 1995-12-27 | Staefa Control System Scs Ag | Control valve with actuating drive |
| 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 |
| CN201428840Y (en) * | 2009-04-26 | 2010-03-24 | 张周卫 | Double-pressure control pressure relief throttle valve |
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2011
- 2011-10-07 CN CN201110293057.1A patent/CN102454813B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07286679A (en) * | 1994-04-14 | 1995-10-31 | Hikari Gokin Seisakusho:Kk | Hot water mixing valve |
| EP0689015A1 (en) * | 1994-06-21 | 1995-12-27 | Staefa Control System Scs Ag | Control valve with actuating drive |
| 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 |
| CN201428840Y (en) * | 2009-04-26 | 2010-03-24 | 张周卫 | Double-pressure control pressure relief throttle valve |
Non-Patent Citations (1)
| Title |
|---|
| 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》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105299280A (en) * | 2015-10-26 | 2016-02-03 | 徐州工业职业技术学院 | Novel type 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102454813B (en) | 2014-04-23 |
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