CN103807158B - Tiny flow quantity continuous adjustment system under high pressure - Google Patents
Tiny flow quantity continuous adjustment system under high pressure Download PDFInfo
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- CN103807158B CN103807158B CN201410065290.8A CN201410065290A CN103807158B CN 103807158 B CN103807158 B CN 103807158B CN 201410065290 A CN201410065290 A CN 201410065290A CN 103807158 B CN103807158 B CN 103807158B
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Abstract
The invention provides tiny flow quantity continuous adjustment system under high pressure, belong to high-pressure liquid transportation art.This system comprises cooling structure, high-pressure service pump structure for conveying, flow adjusting structure.Cooling structure comprises cooling coil and cryostat, and cooling coil is arranged in cryostat, and the front end of cooling coil is connected with external pipe, and the rear end of cooling coil is connected with one end of import threeway; High-pressure service pump structure for conveying is connected and composed successively by import threeway, import one-way valve, high-pressure service pump, outlet threeway, Outlet check valves, pressure meter three-way and delivery gauge; One end of import threeway is with cooling coil rear end or be directly connected external pipe, and one end of pressure meter three-way is connected with flow adjusting structure.Flow adjusting structure finely tunes metering valve by high pressure reset valve, high pressure and restrictor connects and composes successively; High pressure reset valve is connected with one end of outlet threeway, and restrictor is connected with import threeway in high-pressure service pump structure for conveying.Structure of the present invention is simple, and cost is low, has certain self-regulation ability.
Description
Technical field
The present invention relates to tiny flow quantity continuous adjustment system under a kind of high pressure, belong to high-pressure liquid transportation art.
Background technique
The high-pressure service pump such as high-pressure plunger pump, diaphragm pump, in the high pressure such as supercritical technology, liquefied petroleum gas, ultrahigh pressure field, has and extensively has application.These high-pressure service pumps itself can realize the fine adjustment of flow by adjustment stroke, but flow adjustment range is limited, when the stroke of large discharge is too small, can not effective fed sheet of a media, and can not directly control pressure.In order to realize Flow-rate adjustment and ensure security of system, often will after pump installation high-voltage knock out drum and safety valve, and need artificial adjustment stroke or close high-pressure service pump, thus control or regime flow, make the operation that security of system is stable.This scheme simple possible, but there is some great defect: (1) high-pressure buffering pot cost is high, adds the hold-up of raw material, and when pressure is high especially, the compressibility coefficient of medium increases, and regulating power obviously declines.For the system that pressure is very high, this scheme can not meet safety requirement.(2) pressure, Flow-rate adjustment need manual intervention, speed of response is slow, especially for emergency situations as system outlet blocking etc., can not significant response, build-up of pressure constantly increases, safety valve is caused to be opened, fed sheet of a media leaks, and when medium is volatile poisonous, inflammable and explosive, aggressive medium, will cause huge destruction, if safety valve can not normally be opened, the danger of blast will be had.(3) high-capacity pump feed flow hour, causes the uneven wear of plunger, reduces the working life of pump; When the stroke of pump is too small, can not sucks media implementation and effectively carry, namely large-flow high-pressure pump cannot realize the tiny flow quantity conveying of medium.Chromatogram pump or syringe pump can realize the conveying of tiny flow quantity and the control of pressure, overcome above-mentioned defect completely, but expensive, considerably increase equipment cost.
Summary of the invention
In order to overcome the shortcoming of conventional high-tension pump-knock out drum pressure/flow control system, the present invention proposes tiny flow quantity continuous adjustment system under a kind of high pressure, by capacity of reflux size and outlet pressure feedback regulation output flow, structure is simple, with low cost, pump duty coarse adjustment+auxiliary micro-tensioning system is effectively combined, can realize replacing expensive chromatogram pump or syringe pump with cheap plunger pump/diaphragm pump, realize large discharge (L/h), the continuous adjustment of small flow (mL/min) and micro-flow (μ L/min), i.e. " pump is multiplex ", and there is certain self-regulation ability.
Technological scheme of the present invention is the adjustment utilizing backflow to realize rate of discharge and pressure, and automatically can adjust uninterrupted to a certain extent according to outlet pressure size, this system comprises cooling structure, high-pressure service pump structure for conveying, flow adjusting structure, is connected between each structure and in structure between each parts by pipeline.
Cooling structure comprises cooling coil and cryostat, and cooling coil is arranged in cryostat, and the front end of cooling coil is connected with external pipe, and the rear end of cooling coil is connected with one end of the import threeway of high-pressure service pump structure for conveying, plays cooling and buffering two aspect effects; Cryostat provides low-temperature receiver for cooling coil, and cooling structure only uses when medium is liquid gas.
High-pressure service pump structure for conveying is connected and composed successively by import threeway, import one-way valve, high-pressure service pump, outlet threeway, Outlet check valves, pressure meter three-way and delivery gauge; One end of import threeway is connected with the cooling coil rear end of cooling structure or directly connects external pipe, and one end of pressure meter three-way is connected with flow adjusting structure.
Flow adjusting structure finely tunes metering valve by high pressure reset valve, high pressure and restrictor connects and composes successively; High pressure reset valve is connected with one end of high-pressure service pump structure for conveying middle outlet threeway, and restrictor is connected with import threeway in high-pressure service pump structure for conveying.Flow adjusting structure is shunted high-pressure service pump output flow, thus realizes the adjustment to system output stream amount.
High-pressure service pump inlet and outlet pressure difference is larger, and in zone of high pressure, pressure medium with Media density change obviously, thus small changes in flow rate, larger pressure change may be caused, the present invention adopts three components in combination of flow control system to control capacity of reflux, to ensure that pump under the prerequisite of normal fed sheet of a media, can carry out the adjustment of pressure, flow.Wherein, high pressure reset valve tentatively adjusts flow and controls the opening and closing of bypass; High pressure fine setting metering valve realizes regulating accurate, the trace of flow; Restrictor is in order to increase pipe resistance, limit return flow amount, for ensureing that it has enough resistances, restrictor caliber will much smaller than main flow line caliber, for the main flow line of φ 3 and φ 6, restrictor will select the steel pipe of 1/16, and restrictor coil lengths is determined by medium and operating pressure differential, pressure reduction is larger, Media density viscosity is less, and coil pipe is longer.
The self-regulation ability that tool of the present invention is certain, pump stroke and Flow-rate adjustment valve opening certain time, capacity of reflux is relevant with the pressure reduction before and after pump, pressure reduction is larger, capacity of reflux is larger, thus the present invention can realize automatic control to a certain extent, after pump, automatically increase capacity of reflux during pressure increase, thus reduces output flow.This is conducive on the one hand the stable of system, is conducive to the safety of system on the other hand, and when running into the emergency case such as system outlet blocking, the advancing the speed of pressure after slowing down pump, even just limits the lifting of pressure before safety valve is opened.When pressure increases too fast, when exceeding automatic flow regulation range, only need simple adjustment pressure fine setting metering valve, just can change capacity of reflux fast, thus pressure after restrictive pump, ensure security of system.
Big-flow high-pressure plunger pump, diaphragm pump, cannot fed sheet of a media when stroke is too small, but by the present invention, can realize the medium transport of small flow, micrometeor, convenient and swift, plunger can be protected to be unlikely to uneven wearing and tearing, be conducive to the maintenance of pump.When not needing accurate flow control, expensive chromatogram pump, syringe pump can be replaced completely.
Structure of the present invention is simple, and cost is low, has certain self-regulation ability, can realize replacing expensive chromatogram pump or syringe pump with cheap plunger pump/diaphragm pump, and Flow-rate adjustment is rapidly convenient.
Accompanying drawing explanation
Accompanying drawing is tiny flow quantity continuous adjustment system schematic diagram under portable type high pressure.
In figure: 1 high-pressure service pump; 2 import one-way valves; 3 input media imports; 4 cooling coils; 5 cryostats;
6 import threeways; 7 restrictors; 8 high pressure fine setting metering valves; 9 high pressure reset valves; 10 Outlet check valves; 11 pressure meter three-ways; 12 fed sheet of a media outlets; 13 outlet threeways; 14 delivery gauges.
Embodiment
Embodiment is illustrated below in conjunction with Figure of description.
Embodiment
Cooling system is made up of cooling coil 4 and cryostat 5; High-pressure service pump transporting system is made up of import threeway 6, import one-way valve 2, high-pressure service pump 1, outlet threeway 13, Outlet check valves 10, pressure meter three-way 11 and delivery gauge 14; Flow control system finely tunes metering valve 8 by high pressure reset valve 9, high pressure and restrictor 7 forms.For the medium such as liquefied petroleum gas, carbon dioxide, the upstream 3 of this system is connected with the cooling coil 4 of cooling structure; For liquid medium, the import threeway 6 that is direct and high-pressure service pump transporting system of the upstream 3 of this system links.Import one-way valve 2 can prevent the medium refluxed from restrictor 6 from turning back to the upstream 3 of this system.The medium entered from one-way valve 2 enters high-pressure service pump 1 together with the medium refluxed from restrictor 7.Medium is divided into two-way fluid after high-pressure service pump supercharging, and wherein main flow enters pressure duct by Outlet check valves 10, and delivery gauge can monitor outlet pressure, plays warning effect; Backflow is successively by high pressure reset valve 9, high pressure fine setting metering valve 8, after restrictor 7, get back to pump inlet, by these three parts, bypass has had obvious Pressure Drop, restrictor 7 outlet pressure and system upstream 3 pressure close, the flow in tributary and pressure mainly logical high pressure fine setting metering valve 8 are finely tuned, and high pressure reset valve 9 plays the effect in preliminary adjust flux and On/Off tributary, restrictor 7 adds bypass resistance, ensures that bypass has enough Pressure Drops.
Use supercritical carbon dioxide extracting soybean oil, operation pressure is 25MPa, and source of the gas is dioxide bottle, and pressure is about 5MPa, and extractor effective volume is 100mL.An existing flow is the high-pressure plunger pump of 8L/h, and for this extracting operation, flow is bigger than normal, and reduces pump stroke and easily cause plunger uneven wear, and Flow-rate adjustment is inconvenient; System outlet flow is unstable because of dry ice blocking valve port, and thus extractor pressure has larger fluctuation, needs the stroke adjusting pump even to close pump to prevent extractor superpressure.Little under formula high pressure easy to use/micrometeor continuous adjustment system transformation original system, is connected dioxide bottle with cooling coil 4, is connected pressure meter three-way one end with extractor.During use, the stroke of pump is fixed on suitable size, controls output flow by high pressure fine setting metering valve 8 and high pressure reset valve 9.After employing this device, Flow-rate adjustment is convenient, closes high pressure reset valve 9 at boost phase, adopts large discharge, makes pressure energy reach required value rapidly; Open high pressure reset valve 9 in extraction stages, adjust carbon dioxide flow with high pressure fine setting metering valve 8, output flow is little, stable, fast easy to adjust.Outlet dry ice blocks the pressure surge caused and improves due to the autoregulation of this device, makes pressure fluctuate between 22-28MPa and be unlikely to superpressure.
Claims (2)
1. a tiny flow quantity continuous adjustment system under high pressure, is characterized in that, this system comprises cooling structure, high-pressure service pump structure for conveying, flow adjusting structure, is connected between each structure and in structure between each parts by pipeline;
Cooling structure comprises cooling coil and cryostat, and cooling coil is arranged in cryostat, and the front end of cooling coil is connected with external pipe, and the rear end of cooling coil is connected with one end of the import threeway of high-pressure service pump structure for conveying; Cooling structure only uses when medium is liquid gas;
High-pressure service pump structure for conveying is connected and composed successively by import threeway, import one-way valve, high-pressure service pump, outlet threeway, Outlet check valves, pressure meter three-way and delivery gauge; One end of import threeway is connected with the cooling coil rear end of cooling structure or directly connects external pipe, and one end of pressure meter three-way is connected with flow adjusting structure;
Flow adjusting structure finely tunes metering valve by high pressure reset valve, high pressure and restrictor connects and composes successively; High pressure reset valve is connected with one end of high-pressure service pump structure for conveying middle outlet threeway, and restrictor is connected with import threeway in high-pressure service pump structure for conveying.
2. tiny flow quantity continuous adjustment system under high pressure according to claim 1, is characterized in that, described high-pressure service pump is high-pressure plunger metering pump or high-pressure diaphragm pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065290.8A CN103807158B (en) | 2014-02-25 | 2014-02-25 | Tiny flow quantity continuous adjustment system under high pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410065290.8A CN103807158B (en) | 2014-02-25 | 2014-02-25 | Tiny flow quantity continuous adjustment system under high pressure |
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| Publication Number | Publication Date |
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| CN103807158A CN103807158A (en) | 2014-05-21 |
| CN103807158B true CN103807158B (en) | 2016-01-13 |
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| CN201410065290.8A Expired - Fee Related CN103807158B (en) | 2014-02-25 | 2014-02-25 | Tiny flow quantity continuous adjustment system under high pressure |
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Citations (6)
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| CN1619305A (en) * | 2003-11-12 | 2005-05-25 | 株式会社岛津制作所 | Liquid feed pump apparatus |
| CN1244396C (en) * | 2001-02-02 | 2006-03-08 | 巴塞尔聚烯烃股份有限公司 | Method for dosing catalyst |
| CN1759255A (en) * | 2003-03-21 | 2006-04-12 | 帕克汉尼芬股份公司 | A device for controlling a hydraulically driven motor |
| CN1780987A (en) * | 2003-04-04 | 2006-05-31 | 艾拉斯科普库空气动力股份有限公司 | Method for controlling a compressed air installation comprising several compressors, control box applied thereby and compressed air installation applying this method |
| CN101575279A (en) * | 2009-06-25 | 2009-11-11 | 河北理工大学 | Method for supercritical fluid extraction of juglone in walnut seed green skin waste residue |
| CN102892996A (en) * | 2010-04-28 | 2013-01-23 | 斯奈克玛 | Turbomachine fueling system with jet pump |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2674331A1 (en) * | 2008-08-06 | 2010-02-06 | Maax Bath Inc. | Bypass system to control liquid volume |
-
2014
- 2014-02-25 CN CN201410065290.8A patent/CN103807158B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1244396C (en) * | 2001-02-02 | 2006-03-08 | 巴塞尔聚烯烃股份有限公司 | Method for dosing catalyst |
| CN1759255A (en) * | 2003-03-21 | 2006-04-12 | 帕克汉尼芬股份公司 | A device for controlling a hydraulically driven motor |
| CN1780987A (en) * | 2003-04-04 | 2006-05-31 | 艾拉斯科普库空气动力股份有限公司 | Method for controlling a compressed air installation comprising several compressors, control box applied thereby and compressed air installation applying this method |
| CN1619305A (en) * | 2003-11-12 | 2005-05-25 | 株式会社岛津制作所 | Liquid feed pump apparatus |
| CN101575279A (en) * | 2009-06-25 | 2009-11-11 | 河北理工大学 | Method for supercritical fluid extraction of juglone in walnut seed green skin waste residue |
| CN102892996A (en) * | 2010-04-28 | 2013-01-23 | 斯奈克玛 | Turbomachine fueling system with jet pump |
Non-Patent Citations (1)
| Title |
|---|
| 超临界反溶剂过程工艺研究;任雅宁;《中国优秀硕士学位论文全文数据库工程科技I辑，2008年第3期》;20080315;第18,31页 * |
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