CN203161467U - Constant flow pump for liquid chromatograph - Google Patents
Constant flow pump for liquid chromatograph Download PDFInfo
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- CN203161467U CN203161467U CN 201320092982 CN201320092982U CN203161467U CN 203161467 U CN203161467 U CN 203161467U CN 201320092982 CN201320092982 CN 201320092982 CN 201320092982 U CN201320092982 U CN 201320092982U CN 203161467 U CN203161467 U CN 203161467U
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- constant flow
- liquid chromatograph
- flow pump
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Abstract
The utility model relates to a liquid chromatograph, in particular to a constant flow pump for the liquid chromatograph, and belongs to the technical field of liquid chromatographs. The constant flow pump is used for delivering liquid in the liquid chromatograph and is characterized by comprising an end cam (15) and a pair of parallel plunger push rods (6), a thrust surface of the end cam (15) is a smooth curved surface, a cam curve is a normal surface curve relative to the plunger push rods (6), two end points of the cam curve correspond to the pair of plunger push rods (6) respectively, the end cam (15) rotates and drives the pair of plunger push rods (6) to move forward by turns, the pair of plunger push rods (6) are driven by springs (17) to reset by turns, and pump bodies (17) corresponding to the pair of plunger push rods (6) suck and push the liquid by turns to provide stable liquid flow.
Description
Technical field
The utility model relates to a kind of liquid chromatograph, relates in particular to a kind of liquid chromatograph constant flow pump, is used for the liquid transmission of liquid chromatograph, belongs to the liquid chromatograph technical field.
Background technique
Liquid chromatograph is the instrument that solution example is carried out compartment analysis, can be used for liquid or the solid sample that is dissolved in liquid carries out constant or microanalysis detects, be applicable to the extensively quality supervision Detection ﹠ Controling in the industry 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 partly is made up of inlet system, transfusion system, piece-rate system, detection system and data processing system etc., and wherein the capital equipment in the transfusion system is high pressure constant flow pump.Liquid chromatograph is by the mobile phase of high pressure constant flow pump output, and for example water or other liquid promote sample solution and separates through chromatographic column, enter the detection that detector carries out sample composition again.High pressure constant flow pump be in the liquid chromatograph one of crucial importance, relatively independent constituent element again.When flow communication was crossed chromatographic column, stable flowing can be reduced the diffusion effect of sample in post, and this all is favourable for the biologically active that improves resolution, sensitivity, detectability, maintenance sample etc.
Liquid chromatograph all is very important instrument for many departments of modern science and technology and national economy.But existing technical barrier of liquid chromatograph long-term existence, namely owing to plunger rod motion match difference, the fluctuation of the delivery pressure of high pressure constant flow pump, thus cause flowed fluctuation, influenced the analyzing and testing of sample.This technical barrier is long-term existence at home and abroad, has limited development and the application of liquid chromatograph.So obtain a kind of output liquid flow, pressure stability, the little high pressure constant flow pump that fluctuates is indispensable for the performance boost of liquid chromatogram instrument, the technical field that liquid chromatogram is related to has good promoting effect, and is significant for the quality of product that improves many industries.
Existing liquid chromatograph constant flow pump, mainly by two kinds of forms, first kind of form, referring to Fig. 1, Fig. 1 has showed a kind of 180 ° of constant flow pumps that single cam is parallel, comprises that is installed in the two reciprocal conveying mechanism of cover and two pump heads 1 that cam 4 on the camshaft 5,180 ° of symmetries are installed in cam 4 both sides.Wherein back and forth conveying mechanism comprises two supporting rollers 3, connects plunger 2 and plunger push rod 6 on it.The other end of plunger push rod 6 stretches in the pump chamber of pump head 1, is provided with seal element between plunger push rod 6 and the pump head 1.Pump head 1 is provided with inlet opening and the outage that is communicated with pump chamber respectively, and one-way valve is installed in inlet opening and the outage separately.Two outages are connected in the threeway 7 by pipeline, pump solution and are finally flowed out by the public outlet of threeway 7.On the basic circle excircle of cam 4 cam curve is arranged, supporting roller 3 contacts cooperation with the cam curve of cam 4.When driving mechanism drove cam 4 and rotates, supporting roller 3 rolled along the cam curve of cam 4, thereby the rotational motion of cam 4 is converted into the to-and-fro motion of plunger 2, and the volume size in the pump chamber of pump head 1 is alternately changed.Advance, under the effect of two one-way valves in the outage, plunger whenever makes a round trip, when the pump chamber volume increases, just extract certain amount of fluid from inlet opening, discharge certain amount of fluid from outage when volume reduces, thereby finish continual and steady high pressure liquor charging function.Because of pump volume change all identical at every turn, so the total discharge that produces is constant.This 180 ° of single cams constant flow pump in parallel, because the reciprocal conveying mechanism symmetry of two covers is launched in the both sides of cam 4, make mechanism itself and matching used other mechanisms, relatively disperse on space layout as feed liquor, discharge opeing and analytical structure, each connecting pipeline etc., shared volume is big, cause the pump overall volume big, need very big containing space; Simultaneously, the fluid passage volume of pump itself is also big, and analysis when making instrument work, clean time and consumption all increase.Therefore its application for liquid chromatograph has significant limitation.
Second kind of form, referring to Fig. 2, Fig. 3, for overcoming the defective of above-mentioned parallel-connected pumps, what the most generally use now is the double-cam parallel-connected pumps, referring to Fig. 2, double-cam parallel high voltage constant flow pump comprises a camshaft 5, is installed in each cam 4 at these camshaft 5 two ends, and reciprocal conveying mechanism and two pump heads 1 of the parallel installation of two covers.Back and forth conveying mechanism cooperates with two cams 4 respectively.Reciprocal conveying mechanism wherein is identical with reciprocal conveying mechanism in 180 ° of single cam parallel-connected pumps shown in Figure 1, repeats no more.In the double-cam parallel-connected pumps, two cam 4 angles differ 180 °, and when wherein the plunger of a cover in the reciprocal conveying mechanism promoted feed flow, the plunger in the another set of reciprocal conveying mechanism promoted imbibition, the pump continuous liquid supply has been guaranteed in the alternation like this of the two reciprocal conveying mechanisms of cover.The parallel homonymy at cam of the reciprocal conveying mechanism of this kind double-cam parallel-connected pumps two covers launches, and has reduced the space that mechanism itself and matching used other mechanisms occupy effectively, and overall volume reduces, and has effectively overcome the defective of single lobe pump.But the employing of this pump two cams, two cams have an independently cam curve separately, so compensation between the two can't realize by curve design.Simultaneously, when both when mounted any deviation such as phase angle all can cause not matching of two cover conveying mechanisms motions, liquid output volume is fluctuateed.And this unmatched source is more, can derive from two cams installation, can derive from the installation of supporting roller, also can derive from the inhomogeneous of processing.So the required precision to processing, installation is high, product is installed need carry out fine adjustment, could obtain good transfusion precision and stability.Simultaneously, cost height when using, stable differing.
In addition, the drive system of existing liquid chromatograph constant flow pump generally adopts the belt pulley control of slowing down, and the stability of belt pulley is not enough, and can not regulate speed ratio, cause constant flow pump flow velocity instability in use, influenced the testing precision of liquid chromatograph.
Summary of the invention
The utility model technical issues that need to address are: existing liquid chromatograph constant flow pump, or overall volume is excessive, needs very big containing space, thereby causes application limit; Or need the double-cam structure, can't carry out the track compensation by the design of cam curve again between double-cam, simultaneously, the double-cam structure Design, processing, assembling, debugging etc. all needs very high precision, and difficulty is higher in actual the use, and stability is not good enough.In addition, the stability of belt pulley is not enough, and can not regulate speed ratio, causes constant flow pump flow velocity instability in use, has influenced the testing precision of liquid chromatograph.
The utility model is by the following technical solutions:
A kind of liquid chromatograph constant flow pump, comprise end cam 15, the plunger push rod 6 of pair of parallel, the thrust face of described end cam 15 are level and smooth curved surface shape, its cam curve is method phase surface curve with respect to described plunger push rod 6, and the two-end-point of cam curve is corresponding with a pair of plunger push rod 6 respectively; End cam 15 rotates, and drives a pair of plunger push rod 6 and promotes forward in turn, and a pair of plunger push rod 6 flows to the horizontal reset action at the drive lower whorl of spring 17; The pump housing 17 in turn imbibitions corresponding with described a pair of plunger push rod 6, push away liquid, stable fluid flow is provided.
Further, also comprise supporting worm screw 11, worm gear 12, described worm screw 11 is driven by belt pulley 9 and rotates, and worm gear 12 rotates under the drive of worm screw 11, and described worm gear 12 is connected with worm-wheel shaft 14, and described worm-wheel shaft 14 is connected with the axle center of described end cam 15.
Further, described worm-wheel shaft 14 is provided with corresponding with it pair of bearings 13.
Further, described belt pulley 9 is connected with the output shaft of motor 8, and rotates described motor 8 by motor 8 its drives.
Further, described motor 8 is stepper motors.
Characteristics of the present utility model are: used normal plane simple curve end cam to drive high pressure constant flow pump, adopt a cam at the live axle end face, this cam has single cam curve at normal plane, so can realize the matched well in two sites on the curve, there is not the installation poor location, two plungers of cam promotion can carry out the to-and-fro motion of matched well thus, have reduced the output fluctuation of constant flow pump, have realized that the liquid of regime flow is carried.
The beneficial effects of the utility model are:
1, Shu Chu fluid pressure is stable, fluctuation is little;
2, the constant flow pump volume is little, I﹠ M is easy;
3, work is carried out continuously automatically, and is simple to operate;
4, component are few, not only reduced by a cam, can also save supporting roller, reduced cost of material.
5, simple in structure, assembling is simple, and is low to the assembly precision requirement, the operation stability height, and maintenance cost is low.
6, the component requirement on machining accuracy reduces, and has reduced processing cost.
Description of drawings
Fig. 1 is the structural representation of liquid chromatograph constant flow pump of single cammingly of prior art.
Fig. 2 is the main TV structure schematic representation of the wheeled liquid chromatograph constant flow pump of the biconvex of prior art.
Fig. 3 is the schematic top plan view of Fig. 2.
Fig. 4 is the structural representation of liquid chromatograph constant flow pump of the present utility model.
Wherein, 1, pump head, 2, plunger, 3, supporting roller, 4, cam, 5, camshaft, 6, the plunger push rod, 7, threeway, 8, motor, 9, belt pulley, 10, drivign belt, 11, worm screw, 12, worm gear, 13, bearing, 14, worm-wheel shaft, 15, end cam, 16, the feed liquor one-way valve, 17, the pump housing, 18, spring, 19, the fluid one-way valve.
Embodiment
Below in conjunction with specific embodiment the utility model is further specified.
Referring to Fig. 4, a kind of high-pressure constant flow pump for single lobe of liquid chromatograph is made up of stepper motor 8, drivign belt 10, bearing 13, worm screw 11, worm gear 12, worm-wheel shaft 14, end cam 15, plunger push rod 6, the pump housing 17 etc.The output shaft of stepper motor 8 drives drive pulley and rotates.Be connected with drivign belt 10 on the drive pulley, drivign belt 10 drives driven pulley and rotates.Driven toothed pulley drives worm screw 11 and worm gear 12 rotates.Worm screw 11, worm gear 12 are worked in coordination, and worm-wheel shaft 14 is along with worm gear 12 rotates.Worm-wheel shaft 14 is provided with corresponding bearing 13, at the end face of worm-wheel shaft 14 end cam 15 is housed, and end cam 15 is normal plane simple curve cam.Worm gear curve on the end cam 15 is reciprocating along with the rotation of worm-wheel shaft 14 alternately promotes two symmetrical plunger push rods 6.In the pump housing 17, the end of plunger push rod 6 is provided with spring 18, and the elastic force of spring 18 promotes plunger push rod 6 and does drawback movement.The liquid entrance of the pump housing 18 is respectively equipped with import one-way valve 16 and outlet one-way valve 19, makes liquid to flow forward and can not reflux.
Main points of the present utility model are: promote the to-and-fro motion of two plungers with a normal plane simple curve cam.Mutual coupling during the to-and-fro motion of two plungers makes the liquid that all can pump equal volume in a flash in office, thereby realizes the mobile phase of output constant current.Because curve is single, so there is not the match penalties in the assembly process.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 cam, namely Q/ Δ t is constant.By changing the rotating speed of stepper motor, namely can change the value of Q/ Δ t.
Because be the plunger rod motion that the single curve of same cam promotes two symmetries, so but two plunger rod matched well make the liquid volume, flow, the pressure that pump identical, avoided fluctuation.
The utility model using method is simple, as long as startup and control step motor can be realized function, has guaranteed finishing of the utility model task.
The utility model effect is remarkable, because it is with two plungers of single curve controlled on same, so there is not assembly error.Existing constant flow pump both domestic and external substantially 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, causes the fluctuation of constant flow pump output volume and pressure.The utility model adopts the change of driving structure to realize the function that stable liquid is exported, and greatly reduces the fluctuation of constant flow pump output flow and pressure.
The utility model installation, simple to operate, reliable for effect has realized the stable output of highly pressurised liquid by structural change.And have advantages such as pump volume is little, assembling is simple, reduced processing, production and maintenance cost.Because the liquid chromatograph application is extensive, the utlity model has high marketing prospect and commercial value.
Be preferred embodiment of the present utility model only below, and be not used in restriction protection domain of the present utility model.To those of ordinary skill in the art, under total model utility design of the present utility model, various conversion can be arranged.For example to the practise physiognomy overall principle of two plunger rods motions of simple curve cam control of method of the utility model, that does is equal to replacement, improvement etc., all is included within the protection domain of the present utility model.
Claims (5)
1. liquid chromatograph constant flow pump is characterized in that:
Comprise end cam (15), the plunger push rod (6) of pair of parallel, the thrust face of described end cam (15) is level and smooth curved surface shape, and its cam curve is method phase surface curve with respect to described plunger push rod (6), and the two-end-point of cam curve is corresponding with a pair of plunger push rod (6) respectively;
End cam (15) rotates, and drives a pair of plunger push rod (6) and promotes forward in turn, and a pair of plunger push rod (6) flows to the horizontal reset action at the drive lower whorl of spring (17);
In turn imbibition of the pump housing (17) corresponding with described a pair of plunger push rod (6), push away liquid, stable fluid flow is provided.
2. liquid chromatograph constant flow pump as claimed in claim 1 is characterized in that:
Also comprise supporting worm screw (11), worm gear (12), described worm screw (11) is driven by belt pulley (9) and rotates, worm gear (12) rotates under the drive of worm screw (11), described worm gear (12) is connected with worm-wheel shaft (14), and described worm-wheel shaft (14) is connected with the axle center of described end cam (15).
3. liquid chromatograph constant flow pump as claimed in claim 2 is characterized in that: described worm-wheel shaft (14) is provided with corresponding with it pair of bearings (13).
4. liquid chromatograph constant flow pump as claimed in claim 2, it is characterized in that: described belt pulley (9) is connected with the output shaft of motor (8), and it drives rotation by motor (8), described motor (8).
5. liquid chromatogram constant flow pump as claimed in claim 4, it is characterized in that: described motor (8) is stepper motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092982 CN203161467U (en) | 2013-02-28 | 2013-02-28 | Constant flow pump for liquid chromatograph |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320092982 CN203161467U (en) | 2013-02-28 | 2013-02-28 | Constant flow pump for liquid chromatograph |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203161467U true CN203161467U (en) | 2013-08-28 |
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ID=49022656
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320092982 Expired - Lifetime CN203161467U (en) | 2013-02-28 | 2013-02-28 | Constant flow pump for liquid chromatograph |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203161467U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108170173A (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 |
-
2013
- 2013-02-28 CN CN 201320092982 patent/CN203161467U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108170173A (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 |
| CN108170173B (en) * | 2017-12-26 | 2020-09-04 | 迈克医疗电子有限公司 | Flow control method and apparatus, analyzer, and computer-readable storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |