CN101603516A - High-pressure constant flow pump for single lobe of liquid chromatograph - Google Patents
High-pressure constant flow pump for single lobe of liquid chromatograph Download PDFInfo
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- CN101603516A CN101603516A CNA2009100539868A CN200910053986A CN101603516A CN 101603516 A CN101603516 A CN 101603516A CN A2009100539868 A CNA2009100539868 A CN A2009100539868A CN 200910053986 A CN200910053986 A CN 200910053986A CN 101603516 A CN101603516 A CN 101603516A
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Abstract
The invention belongs to analytical instrument, high-pressure constant flow pump for single lobe of liquid chromatograph.The delivery pressure fluctuation of existing liquid chromatograph high pressure constant flow pump has influenced test result of samples.Stepper motor of the present invention (1) drives worm screw (6), worm gear (7) rotation by synchronous belt (3), the end face of worm-wheel shaft (8) is provided with cam (9), it is reciprocating that curve on the cam (9) promotes two symmetrical plunger rods (10), be provided with spring (13) in the pump housing (12), the elastic force of spring (13) promotes plunger rod (10) drawback movement; The liquid entrance of the pump housing (12) is provided with import one-way valve (11) and outlet one-way valve (14).The present invention uses single cam driven double-plunger, has solved the technical barrier of liquid chromatograph high pressure constant flow pump long-term insoluble output flow, pressure surge.Advantage of the present invention is: output fluid pressure is stable, fluctuation is little; Volume is little, assembling is easy; Simple to operate.
Description
Technical field
The invention belongs to analytical instrument, a kind of specifically high-pressure constant flow pump for single lobe of liquid chromatograph.
Background technique
Liquid chromatograph is the instrument that sample solution is carried out chromatographic analysis, is used for the laboratory to liquid or the solid sample that is dissolved in liquid carries out constant and microanalysis detects.Be specially adapted to the quality supervision Detection ﹠ Controling in the industries such as agricultural chemicals, chemical fertilizer, medicine, epidemic prevention, environmental protection, commodity inspection, food, beverage, drinks, feed, petrochemical industry, coal, dyestuff, fine chemistry industry.Be widely used in fields such as organic chemical industry, organic synthesis, analytical chemistry, biochemistry, bioengineering, amino acid analysis, national defence scientific research teaching.
Liquid chromatograph mainly is made up of inlet system, transfusion system, piece-rate system, detection system and data processing system.Wherein the capital equipment in the transfusion system is a high pressure constant flow pump.The principle of liquid chromatograph is: by high pressure constant flow pump output mobile phase, for example water or other liquid promote sample solution and separate through chromatographic column, enter the detection that detector carries out sample composition again.High pressure constant flow pump is in the liquid chromatograph one and important, relatively independent again constituent element.When high-pressure flow is stable mutually during by chromatographic column, can reduce the diffusion effect of sample in post, accelerate its travelling speed in post, this all is favourable for the biologically active that improves resolution, recovery sample, maintenance sample etc.
Liquid chromatograph all is very important instrument for many departments of modern science and technology and national economy.But there is a long-term insoluble technical barrier in existing liquid chromatograph: i.e. the delivery pressure of high pressure constant flow pump fluctuation has influenced test result of samples.This technical barrier is long-term existence at home and abroad, has limited the development and the application of liquid chromatograph.Simultaneously also the quality of product of many industries such as agricultural chemicals, chemical fertilizer, medicine, epidemic prevention, environmental protection, commodity inspection, food, beverage, drinks, feed, petrochemical industry, coal, dyestuff, fine chemistry industry is brought influence; Development and progress to a plurality of technical fields such as organic chemical industry, organic synthesis, analytical chemistry, biochemistry, bioengineering, amino acid analysis, national defence scientific research teaching brings influence.
So invent a kind of output liquid flow, pressure stability, a plurality of technical fields of little liquid chromatograph high pressure constant flow pump for science and technology fluctuate; For the many industries that promote socio-economic development; For the quality of product that improves many industries all is very urgent and important.
The present invention adopts an end cam to promote two plungers and moves back and forth, and has eliminated alignment error, has reduced the output fluctuation of constant flow pump, has invented high-pressure constant flow pump for single lobe of liquid chromatograph.Through extensively consulting domestic and international public publication and patent searching document, there is no the constant flow pump identical, so the present invention has conspicuous novelty and creativeness with structure of the present invention; Because constant flow pump is an essential important component in the liquid chromatograph, so the present invention has obvious practicability.
Summary of the invention
The objective of the invention is that a kind of delivery pressure is stable, fluctuation is little in order to provide, volume is little, assembling is easy to high-pressure constant flow pump for single lobe of liquid chromatograph.
The object of the present invention is achieved like this:
A kind of high-pressure constant flow pump for single lobe of liquid chromatograph, form by stepper motor, bearing, plunger rod, the pump housing, stepper motor drives worm screw, worm gear rotation by synchronous belt, and the end face of worm-wheel shaft is provided with cam, and the curve on the cam promotes two symmetrical plunger rods motions; Be provided with spring in the pump housing, the elastic force of spring promotes the plunger rod drawback movement; The liquid entrance of the pump housing is provided with import one-way valve and outlet one-way valve.
Stepper motor drives toothed pulley and rotates, and is connected with drivign belt on the toothed pulley, and drivign belt drives driven toothed pulley and rotates; Driven toothed pulley drives worm screw, worm gear, and worm-wheel shaft rotates.
The two ends of worm-wheel shaft are provided with bearing.
Main points of the present invention are:
Promote the to-and-fro motion of two plungers with an end cam.The curve of end cam has guaranteed the to-and-fro motion liquid that all can pump equal volume in a flash in office of two plungers through tight designing and calculating, realizes the mobile phase of output constant current.As long as with a certain rotating speed rotation, the flow value of the just flow that can be set accordingly, and arbitrary moment is constant under the driving of stepper motor for end cam, promptly Q/ Δ t is constant.Change the rotating speed of stepper motor, promptly can change the value of Q/ Δ t.
Working principle of the present invention is: start synchronous machine, the rotation of synchronous machine output shaft drives toothed pulley and rotates, and the drivign belt motion drives driven pulley and rotates.Driven pulley rotates and drives worm screw, worm gear rotates; Worm-wheel shaft is also along with rotation.The end face of worm-wheel shaft is provided with cam, and the rotation of worm-wheel shaft makes the curve on the cam alternately promote two symmetrical plunger rod motions.Owing to be the plunger rod motion that same cam promotes two symmetries,, liquid volume, the flow of prior art constant flow pump output, the fluctuation of pressure have been avoided so liquid volume, flow, pressure that two plunger rods pump are identical; Realized purpose of the present invention.Be provided with spring in the constant flow pump pump housing of the present invention, cam curve promotes plunger rod and advances, and the elastic force of spring has promoted the backhaul of plunger rod.In order to guarantee the proper functioning of constant flow pump input and output liquid, prevent liquid countercurrent, the liquid entrance of the pump housing is provided with import one-way valve and outlet one-way valve.
Using method of the present invention is simple, as long as start synchronous machine, other program is carried out continuously automatically, has guaranteed finishing of task of the present invention.
Effect of the present invention is remarkable, because it is with two plungers of same end cam control, so there is not alignment error.Prior art constant flow pump both domestic and external all adopts two face cams or two groups of noncircular gears to control two plungers respectively, unavoidably brings the phase place alignment error of two cams; Unavoidably bring the fluctuation of constant flow pump output volume and pressure.This is the basic reason of the long-standing insoluble technical barrier of prior art.The present invention controls two plungers with same end cam, and the change of structure has overcome two face cams or two groups of noncircular gears are controlled two phase place alignment errors that plunger brought respectively; Greatly reduce the fluctuation of constant flow pump output volume and pressure.Test shows, the mobile phase that high-pressure constant flow pump for single lobe of the present invention pumps, its instantaneous flow, pressure surge value are far smaller than the biconvex wheel pump.
Advantage of the present invention is:
1, Shu Chu fluid pressure is stable, fluctuation is little;
2, the constant flow pump volume is little, assembling is easy;
3, work is carried out continuously automatically, and is simple to operate;
4, use liquid chromatograph quality of product testing result of the present invention accurate.
The present invention uses single cam driven double-plunger in the world first; By structural change, solved the technical barrier of the long-term insoluble output flow of liquid chromatograph high pressure constant flow pump, pressure surge to existing constant flow pump; The present invention is an invention that solves long-term insoluble technical barrier.Because liquid chromatograph is widely used, so the present invention is a widely used invention.The present invention simultaneously is for the testing result accuracy that improves liquid chromatograph; Significant for the quality of product that improves a plurality of industries such as agricultural chemicals, chemical fertilizer, medicine, epidemic prevention, environmental protection, commodity inspection, food, beverage, drinks, feed, petrochemical industry, coal, dyestuff, fine chemistry industry.For the technological progress that promotes fields such as organic chemical industry, organic synthesis, analytical chemistry, biochemistry, bioengineering, amino acid analysis, national defence scientific research teaching important meaning is arranged.
Description of drawings
Fig. 1 is a high-pressure constant flow pump for single lobe of liquid chromatograph schematic diagram of the present invention.
Among the figure: 1 is stepper motor; 2 is toothed pulley; 3 is drivign belt; 4 is driven pulley; 5 is bearing; 6 is worm screw; 7 is worm gear; 8 is worm-wheel shaft; 9 is end cam; 10 is plunger rod; 11 is inlet one-way valve; 12 is the pump housing; 13 is spring; 14 are the outlet one-way valve.
Embodiment:
The present invention will be further described by embodiment below in conjunction with accompanying drawing.
High-pressure constant flow pump for single lobe of liquid chromatograph is made up of stepper motor (1), synchronous belt (3), bearing (5), worm screw (6), worm gear (7), worm-wheel shaft (8), cam (9), plunger rod (10), the pump housing (12).Stepper motor (1) power W, the output shaft of stepper motor (1) drives toothed pulley (2) and rotates.Be connected with drivign belt (3) on the toothed pulley (2), drivign belt (3) drives driven toothed pulley (4) and rotates.Driven toothed pulley (4) drives worm screw (6) and worm gear (7) rotates; Worm screw (6), worm gear (7) are worked in coordination, and worm-wheel shaft (8) is along with worm gear (7) rotates.The two ends of worm-wheel shaft (8) are provided with bearing (5); The end face of worm-wheel shaft (8) is provided with cam (9), and the curve on the cam (9) is reciprocating along with the rotation of worm-wheel shaft (8) alternately promotes two symmetrical plunger rods (10).In the pump housing (12), the rear portion of plunger rod (10) is provided with spring (13), and the elastic force of spring (13) promotes plunger rod (10) and does drawback movement.The liquid entrance of the pump housing (12) is provided with import one-way valve (11) and outlet one-way valve (14).
The present invention is simple to operate, and is reliable for effect.Start synchronous machine, toothed pulley, drivign belt, driven pulley rotate.Driven pulley rotates and drives worm screw, worm gear, worm-wheel shaft rotation.Cam curve on the end face of worm-wheel shaft alternately promotes two symmetrical plunger rod motions.Same cam promotes the plunger rod motion of two symmetries, liquid volume, flow, pressure that two plunger rods pump are identical, has avoided the fluctuation of output liquid volume, flow, pressure; Realized purpose of the present invention.
Be the preferred embodiments of the present invention only below, be not limited to the present invention, for a person skilled in the art, the present invention can have change and change.Every principle that relates to two plunger rods motions of end cam of the present invention control, is equal to replacement, improvement etc. at any modification of being done, all is included in protection scope of the present invention.
Claims (3)
1. high-pressure constant flow pump for single lobe of liquid chromatograph, form by stepper motor (1), bearing (5), plunger rod (10), the pump housing (12), it is characterized in that: stepper motor (1) drives worm screw (6), worm gear (7) rotation by synchronous belt (3), the end face of worm-wheel shaft (8) is provided with cam (9), it is reciprocating that curve on the cam (9) promotes two symmetrical plunger rods (10), be provided with spring (13) in the pump housing (12), the elastic force of spring (13) promotes plunger rod (10) drawback movement; The liquid entrance of the pump housing (12) is provided with import one-way valve (11) and outlet one-way valve (14).
2. high-pressure constant flow pump for single lobe of liquid chromatograph according to claim 1, it is characterized in that: stepper motor (1) drives toothed pulley (2) and rotates, be connected with drivign belt (3) on the toothed pulley (2), drivign belt (3) drives driven toothed pulley (4) and rotates; Driven toothed pulley (4) drives worm screw (6), worm gear (7), and worm-wheel shaft (8) rotates.
3. high-pressure constant flow pump for single lobe of liquid chromatograph according to claim 1 is characterized in that: the two ends of worm-wheel shaft (8) are provided with bearing (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100539868A CN101603516A (en) | 2009-06-26 | 2009-06-26 | High-pressure constant flow pump for single lobe of liquid chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2009100539868A CN101603516A (en) | 2009-06-26 | 2009-06-26 | High-pressure constant flow pump for single lobe of liquid chromatograph |
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| Publication Number | Publication Date |
|---|---|
| CN101603516A true CN101603516A (en) | 2009-12-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2009100539868A Pending CN101603516A (en) | 2009-06-26 | 2009-06-26 | High-pressure constant flow pump for single lobe of liquid chromatograph |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094777A (en) * | 2011-01-27 | 2011-06-15 | 北京清博华科技有限公司 | Plunger pump for preparing liquid chromatographic column |
| CN102155378A (en) * | 2011-03-17 | 2011-08-17 | 芜湖天乐分析仪器有限公司 | High-pressure constant current pump of liquid chromatograph |
| WO2011116633A1 (en) * | 2010-03-23 | 2011-09-29 | 北京普析通用仪器有限责任公司 | Liquid path distributing valve and liquid-phase chromatographic pump comprising the same |
| CN103104432A (en) * | 2013-02-28 | 2013-05-15 | 上海舜宇恒平科学仪器有限公司 | Liquid chromatograph constant flow pump |
| CN104952350A (en) * | 2015-06-29 | 2015-09-30 | 欧世盛（北京）科技有限公司 | High-pressure infusion pump in HPLC (high performance liquid chromatograph) for teaching |
| CN105443347A (en) * | 2015-12-31 | 2016-03-30 | 四川奥博生物医学电子有限公司 | High-pressure pump improved structure |
| CN108171145A (en) * | 2017-12-26 | 2018-06-15 | 迈克医疗电子有限公司 | Flow control methods and device, analytical instrument and computer readable storage medium |
| CN112630360A (en) * | 2020-12-14 | 2021-04-09 | 盐城工学院 | Four-phase cam pump for ion chromatograph |
-
2009
- 2009-06-26 CN CNA2009100539868A patent/CN101603516A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011116633A1 (en) * | 2010-03-23 | 2011-09-29 | 北京普析通用仪器有限责任公司 | Liquid path distributing valve and liquid-phase chromatographic pump comprising the same |
| CN102094777A (en) * | 2011-01-27 | 2011-06-15 | 北京清博华科技有限公司 | Plunger pump for preparing liquid chromatographic column |
| CN102155378A (en) * | 2011-03-17 | 2011-08-17 | 芜湖天乐分析仪器有限公司 | High-pressure constant current pump of liquid chromatograph |
| CN102155378B (en) * | 2011-03-17 | 2012-12-05 | 芜湖天乐分析仪器有限公司 | High-pressure constant current pump of liquid chromatograph |
| CN103104432A (en) * | 2013-02-28 | 2013-05-15 | 上海舜宇恒平科学仪器有限公司 | Liquid chromatograph constant flow pump |
| CN104952350A (en) * | 2015-06-29 | 2015-09-30 | 欧世盛（北京）科技有限公司 | High-pressure infusion pump in HPLC (high performance liquid chromatograph) for teaching |
| CN105443347A (en) * | 2015-12-31 | 2016-03-30 | 四川奥博生物医学电子有限公司 | High-pressure pump improved structure |
| CN108171145A (en) * | 2017-12-26 | 2018-06-15 | 迈克医疗电子有限公司 | Flow control methods and device, analytical instrument and computer readable storage medium |
| CN108171145B (en) * | 2017-12-26 | 2020-08-28 | 迈克医疗电子有限公司 | Flow control method and apparatus, analyzer, and computer-readable storage medium |
| CN112630360A (en) * | 2020-12-14 | 2021-04-09 | 盐城工学院 | Four-phase cam pump for ion chromatograph |
| CN112630360B (en) * | 2020-12-14 | 2022-10-25 | 盐城工学院 | Four-phase cam pump for ion chromatograph |
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Open date: 20091216 |