CN102052275B - Parallel liquid phase chromatographic pump - Google Patents
Parallel liquid phase chromatographic pump Download PDFInfo
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- CN102052275B CN102052275B CN 200910209048 CN200910209048A CN102052275B CN 102052275 B CN102052275 B CN 102052275B CN 200910209048 CN200910209048 CN 200910209048 CN 200910209048 A CN200910209048 A CN 200910209048A CN 102052275 B CN102052275 B CN 102052275B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
- F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
- F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
- F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
- G01N30/04—Preparation or injection of sample to be analysed
- G01N30/16—Injection
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Abstract
The invention provides a parallel liquid phase chromatographic pump. The parallel liquid phase chromatographic pump comprises a cam with a camshaft, a pump head, at least two reciprocating fluid delivery mechanisms and a cam driving mechanism. The cam is an end cam. A cam curve comprises an ascending curve which can convert the rotating motion of the cam into the uniform linear motion of a plunger and a recession curve which enables the plunger to return in situ. Leads r of the ascending curve and the recession curve are both equal to 4v/npiD<2>, and a lead angle theta of the ascending curve is equal to 360 degrees/n, wherein v is the delivery volume of the parallel liquid phase chromatographic pump when the cam rotates a circle; D is the diameter of the plunger; n is the number of the plungers; and n is an integer of 2 to 10. A supporting roller has a conic shape and the ratio of the circumference of one of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position is equal to the ratio of the circumference of the other of any two cross sections of the supporting roller to the perimeter of the cam curve at the corresponding position. The parallel liquid phase chromatographic pump has a simple structure and high fluid pressure stability, and is easy to design and process.
Description
Technical field
The present invention relates to a kind of parallelly connected liquid chromatography pump that is used for liquid chromatograph.
Background technique
Liquid chromatography pump is one of important composition parts of liquid chromatograph, stability, repeatability and the analysis precision of the direct impact analysis of its performance.The liquid chromatography pump that is used for liquid chromatograph at present mainly contains 180 ° of single cam parallel connection liquid chromatography pumps, 120 ° of single cam parallel connection liquid chromatography pumps and 180 ° of double-cam liquid chromatography pumps.
As shown in Figure 1,180 ° of single cam parallel connection liquid chromatography pumps comprise that cam 51, a symmetry that is installed on the camshaft 50 is installed in the two reciprocal conveying mechanism of cover and two pump heads 55 that cam 51 circumference enclose.Wherein back and forth conveying mechanism comprise by the bearing (not shown) be supported on plunger push rod 53 on the housing (not shown) of liquid chromatograph, be fixedly connected on plunger push rod 53 1 ends plunger 59, be fixedly connected on the plug of plunger push rod 53 the other ends and be rotatably installed in the supporting roller 52 in the plug.The other end of plunger 59 stretches in the pump chamber 56 of pump head 55, is provided with seal element 54 between plunger push rod 53 and the pump head 55.Pump head 55 is provided with the inlet opening 57 and outage 58 that is communicated with pump chamber 56 respectively, in inlet opening 57 and the outage 58 the one-way valve (not shown) is installed separately.On its basic circle excircle, be provided with cam curve on the cam 51, the cam curve contact matching of supporting roller 52 and cam 51.When driving mechanism drives cam 51 rotations; Supporting roller 52 rolls along the cam curve of cam 51, thereby the rotational motion of cam 51 is converted into the to-and-fro motion of plunger push rod 53 and plunger 59, makes the pressure size alternate in the pump chamber 56 of pump head 55; Simultaneously advance, under the effect of two one-way valves in the outage; Just realized that plunger 59 just whenever makes a round trip and extracted certain amount of fluid, and discharged certain amount of fluid, accomplished its liquor charging function from outage 58 from inlet opening 57.
180 ° of single cam parallel connection liquid chromatography pumps of this kind; Because the reciprocal conveying mechanism of two covers is arranged symmetrically in the both sides of cam 51; So just feasible matching used with it other structures; On space layout, relatively disperse the industrial design difficulty like the feed liquor mechanism that is communicated with inlet opening, the drainage mechanism that is communicated with outage and analytical structure, each connecting pipeline etc.; And the shared volume of carrier fluid part is big, causes the liquid chromatography pump overall volume big, needs very big containing space.
Shown in Figure 2 is 120 ° of single cam parallel connection liquid chromatography pumps, its structure is basic identical with 180 ° of parallelly connected liquid chromatogram pump structures of single cam, more than only one overlap reciprocal conveying mechanism and a pump head 55.Have the 3 reciprocal conveying mechanism of cover and 3 pump heads 55 in these 120 ° single cam parallel connection liquid chromatography pumps.The reciprocal conveying mechanism of 3 covers is radial even distribution around the cylindrical of cam 51, the angle between the reciprocal conveying mechanism of adjacent two covers is 120 °.Back and forth conveying mechanism is identical with reciprocal conveying mechanism among Fig. 1, repeats no more.
In 120 ° of single cam parallel connection liquid chromatography pumps of this kind; The reciprocal conveying mechanism of 3 covers space is evenly arranged in around cam 51 cylindricals for 120 °; A series of defectives such as the same each connecting pipeline etc. of existing with above-mentioned 180 ° of single cams parallel connection liquid chromatogram pump structures disperses on space layout, and industrial design difficulty, machine volume are big.
To the defective of above-mentioned parallelly connected liquid chromatography pump, a kind of 180 ° of double-cam liquid chromatography pumps have appearred, and also be the liquid chromatography pump that generally uses at present.As shown in Figure 3,180 ° of double-cam liquid chromatography pumps comprise a camshaft 50, are installed in the main cam 511 and the auxiliary cam 512 at these camshaft 50 two ends, and parallel reciprocal conveying mechanism and two pump heads 55 of two covers.Back and forth conveying mechanism respectively with main cam 511 and auxiliary cam 512 cooperatings.Reciprocal conveying mechanism wherein is identical with reciprocal liquor charging machine in 180 ° of single cams parallel connection liquid chromatography pumps shown in Figure 1, repeats no more.Can 180 ° of double-cam liquid chromatography pumps of this kind be designed to parallel or in-line according to design demand.In 180 ° of double-cam parallel connection liquid chromatography pumps; Main cam 511 is 180 ° with differing of auxiliary cam 512; When plunger feed flow in the reciprocal conveying mechanism of a cover wherein; During plunger imbibition in the another set of reciprocal conveying mechanism, the liquid chromatography pump continuous liquid supply has been guaranteed in the alternation like this of the two reciprocal conveying mechanisms of cover.In 180 ° of double-cam series connection liquid chromatography pumps, also have certain differing between main cam 511 and the auxiliary cam 512.
In 180 ° of double-cam liquid chromatography pumps of this kind, two pump heads 55 are arranged in the same side of cam, and the reciprocal conveying mechanism of two covers is arranged in parallel, and has improved mechanism design situation of difficult such as aforementioned two kinds of liquid chromatogram pump volumes are big, pipeline to a certain extent.But because major and minor cam all is peripheral cam (being that cam curve is arranged on the periphery of cam); The reciprocal conveying mechanism of two covers is driven respectively by major and minor cam; This just requires the cam curve of major and minor cam must reach sufficiently high precision, could guarantee that the reciprocal conveying mechanism of two covers is by accurately alternating movement of designing requirement strictness.As far as one of them peripheral cam, its cam curve mainly comprises ascend curve, recession curve and transition curve etc.
In theory, the ascend curve of peripheral cam adopts spiral of Archimedes, can guarantee that plunger does uniform motion in a straight line, can guarantee that liquid chromatography pump obtains inlet hydraulic stably.But the pressure of pump will experience a process from 0 to high pressure or ultrahigh pressure in practice, and liquid can be compressed along with variation in pressure in this process, thereby need carry out the compressibility coefficient compensation.Therefore in order to guarantee minimum system's pulsation, just need revise cam curve.In addition; Between supporting roller diametric(al) and the cam circumference tangent direction, all can have a pressure angle between the diametric(al) of machining tool and the cam circumference tangent direction, the size of pressure angle depends on size and the diameter of supporting roller and cutter of the helical pitch of generating circle that cam adopts, ascend curve.The Motion curves that the generation of pressure angle is obtained in the time of can making Design Theory curve and the curve that obtained of processing and cam promote supporting roller produces deviation, and this can cause pressure surge equally.Reducing pressure surge also need realize through the correction of curve.But for these 180 ° of traditional double-cam liquid chromatography pumps; Owing to have two cams; It is strict accurate, strict corresponding that two cam curves of two cams must keep again; So when the cam curve of one of them cam is revised, the correction that must be simultaneously the cam curve of another cam be adapted; And owing to exist and differ between the major and minor cam; So the curve that need be revised not only comprises the spiral of Archimedes as ascend curve, but also comprise recession curve and transition curve, the cam curve quantity that is formed at like this on each cam can reach tens; Kind is also very complicated; Acceleration curve, deceleration curve etc. are arranged, so the cam difficulty of processing in 180 ° of double-cam liquid chromatography pumps of this conventional construction is big; Be difficult to guarantee the design accuracy requirement, cause the fluid pressure poor stability thus; Simultaneously because be difficult to guarantee the strict correspondence of the fair curve of two cams, institute thinks the defective of elimination pressure stability difference and the cam curve correction carried out also is difficult to get a desired effect.
In the cam liquid chromatography pump of above-mentioned three kinds of structures; Because plunger 59 moves with respect to pump head 55; So the seal element 54 that requires to be arranged between plunger 59 and the pump head 55 can guarantee that plunger 59 can be with respect to pump head 55 motions; Guarantee that again the liquid in the pump chamber does not leak, and belongs to moving sealing element.The working life of seal element 54 is directly related with the stroke and the operating frequency of plunger 59.The flow of liquid chromatography pump receives the cam lift design limit, must increase plunger stroke or improve the reciprocating frequency of plunger if want to increase flow, and this can give the deleterious impact in working life of seal element; And in order to improve the working life of seal element, often can only reduce plunger stroke or reduce the reciprocating frequency of plunger, this can influence the ideal designs flow again, has reduced the application area of cam pump, and positive so-called fish and bear's paw can not get both.So how can guarantee the sealability of seal element, can prolong its working life again, prolong the working life of two cam pumps then, be the technical problem that industry needs to be resolved hurrily.
In sum, existing cam liquid chromatography pump has following defective:
1. the cam design difficulty is big;
2. cam structure is complicated, and processing difficulties does not reach the design accuracy requirement, causes the poor stability of fluid pressure thus, and whether pressure stability will directly influence the reproducibility of the stable and analysis result of baseline;
3. connecting pipeline etc. disperses on space layout, the industrial design difficulty;
4. the volume of parallelly connected liquid chromatography pump is big;
5. lack the working life of seal element, cause the working life of cam liquid chromatography pump short then.
In view of the defective that above-mentioned existing technology exists, the design people proposes a kind of liquid chromatography pump, can avoid above-mentioned various defective, makes it have more practicability.
Summary of the invention
It is big that the present invention will solve existing liquid chromatography pump cam design difficulty, and cam structure is complicated, processing difficulties, and the technical problem of fluid pressure poor stability.
For solving the problems of the technologies described above, the present invention adopts following technological scheme:
Parallelly connected liquid chromatography pump of the present invention comprises cam, pump head, at least two reciprocal conveying mechanisms of cover with camshaft and the cam drive mechanism that is used to drive said cam rotation.The inlet opening and the outage that be provided with pump chamber in the said pump head, are communicated with this pump chamber.The reciprocal conveying mechanism of said every cover comprises the plunger push rod, be fixedly connected on this plunger push rod one end and the plunger coaxial with it, be installed in the supporting roller of the said plunger push rod the other end rotationally, and the other end of said plunger stretches in the pump chamber of said pump head cooperating with it.The cam curve contact matching work of said supporting roller and said cam.Wherein said cam is an end cam, and its cam curve is arranged on the other end opposite with the end face with camshaft.Said cam curve bag can convert the rotational motion of said cam to an ascend curve of said plunger uniform motion in a straight line and make a recession curve of said plunger returning position.The helical pitch of said ascend curve and said recession curve is identical, is r=4v/n π D
2, lift angle θ=360 of said ascend curve °/n, wherein v representes the said parallelly connected liquid chromatogram pump displacement in said one week of cam rotation, and D representes the diameter of said plunger, and n representes the quantity of plunger, and n is the integer between the 2-10.The reciprocal conveying mechanism of said at least two covers is arranged in the side with cam curve of said cam, and arranges evenly that at circumferencial direction their center line all is parallel to the center line of said camshaft.Said supporting roller is a truncated cone, and the circumference of any two cross sections of this supporting roller equates with the ratio of the girth of the cam curve of opposite position.
Said cam curve also comprises the transition curve that connects said ascend curve and said recession curve.
The two end part of the ascend curve in the said cam curve are provided with trimming curve respectively.
The joint of two adjacent curves is provided with the rounding off line in the said cam curve.
Said ascend curve is the uniform pitch helix; Said recession curve is the uniform pitch helix.
The quantity of said reciprocal conveying mechanism is 3 covers; Lift angle θ=120 of said ascend curve °, the angle that said recession curve is corresponding is 240 °.
The quantity of said reciprocal conveying mechanism is 3 covers; Lift angle θ=120 of said ascend curve °, the angle that said recession curve is corresponding is 40 °-60 °.
The quantity of said reciprocal conveying mechanism is 4 covers; Lift angle θ=90 of said ascend curve °, the angle that said recession curve is corresponding is 270 °.
The quantity of said reciprocal conveying mechanism is 4 covers; Lift angle θ=90 of said ascend curve °, the angle that said recession curve is corresponding is 30 °-55 °.
The quantity of said pump head is one, is provided with in it and the reciprocal identical and separate pump chamber of conveying mechanism quantity, and each pump chamber is communicated with an inlet opening and an outage.At least two plungers in described at least two reciprocal conveying mechanisms stretch into respectively in the corresponding pump chamber in the said pump head, with it cooperating.Among certain the present invention, also can be for the reciprocal conveying mechanism of every cover is equipped with an independently pump head, each pump head is provided with the pump chamber with the plunger cooperating, and each pump chamber is communicated with one and advances hole and an outage.But this many pump heads structure is arranged reasons such as trouble, general less use because the installation precision that requires is high, and shared volume is big.
Plunger push rod end in the said reciprocal conveying mechanism is fixedly connected with a plug, and this plug comprises the pin of two positioned opposite, is the groove that is used to hold said supporting roller in the middle of two pins.It is inboard that the two ends of the central shaft of said supporting roller are supported on two said pins respectively rotationally.Angle β=90 between the center line of the central shaft of said supporting roller and said plunger push rod °-α/2, α is the cone angle of said truncated cone supporting roller.
Angle γ=90 between the center line of the bottom surface of the groove of said pin and said plunger push rod °-α.
Can know by technique scheme; The advantage and the good effect of parallelly connected liquid chromatography pump of the present invention are: among the present invention; Because cam wherein is an end cam; Be that cam curve is arranged on the other end opposite with having the end face of camshaft, thus at least two plunger push rods in the reciprocal conveying mechanism of at least two covers can parallel to each otherly arrange, and be arranged on the same side of cam; So each connecting pipeline in the parallelly connected liquid chromatography pump etc. are more concentrated on space layout, reduced the industrial design difficulty significantly; Reduced simultaneously the volume of parallelly connected liquid chromatography pump greatly.
In addition, the ascend curve in the cam curve of end cam can only utilize lead formula: r=4v/n π D according to cam rotation discharge capacity v, the diameter D of plunger and the quantity n of plunger in one week
2Lift angle formula with ascend curve: θ=360 °/n can accomplish the design of cam ascend curve, so in the parallelly connected liquid chromatography pump of the present invention, the ascend curve of cam curve is that a helical pitch is r=4v/n π D
2, lift angle is the curve of θ=360 °/n, the parameter that wherein relates to is few, thereby design greatly simplifies, and not only greatly reduces the design difficulty of cam, and has reduced the many factors that influence fluid pressure; Simultaneously,, just can reach design accuracy easily, thereby the fluid pressure stability that has guaranteed can reach desired level when designing so cam is easy to process, easy because cam curve of the present invention is simple.
Simultaneously, liquid chromatography pump of the present invention has only a cam, when the cam curve of this cam is revised, needn't as existing technology, consider how corresponding with other cam curves, so the finishing be easy to; And because the cam curve quantity among the present invention is few, type is simple, this makes the finishing difficulty of cam curve further reduce, so the present invention can effectively improve fluid pressure stability through finishing cam curve mode easily.
With reference to the accompanying drawing description of a preferred embodiment, above-mentioned and other purpose of the present invention, feature and advantage will be more obvious through following.
Description of drawings
Fig. 1 is existing 180 ° of single cam parallel connection liquid chromatography pump structural representations;
Fig. 2 is existing 120 ° of single cam parallel connection liquid chromatography pump structural representations;
Fig. 3 is existing 180 ° of double-cam liquid chromatography pump structural representations;
Fig. 4 is the stereogram that is used for four Room parallel connection liquid chromatography pump embodiment's cam structure in the parallelly connected liquid chromatography pump of the present invention;
Fig. 5 is four Room parallel connection liquid chromatography pump embodiment's in a parallelly connected liquid chromatography pump of the present invention structural representation;
Fig. 6 is the structural representation of four Room parallel connection liquid chromatography pump embodiment's supporting roller in the parallelly connected liquid chromatography pump of the present invention;
Fig. 7 representes the schematic representation that supporting roller shown in Figure 6 is installed on the plunger push rod;
Fig. 8 is the stereogram that is used for three Room parallel connection liquid chromatography pump embodiment's cam structure in the parallelly connected liquid chromatography pump of the present invention.
Embodiment
Describe specific embodiment of the present invention below with reference to accompanying drawings in detail.Should be noted that the embodiments described herein only is used to illustrate, be not limited to the present invention.
Like Fig. 4, shown in Figure 8, the cam 61 in the parallelly connected liquid chromatography pump of the present invention is end cams, and its cam curve is arranged on the other end opposite with the end face with camshaft 60.Cam curve comprises that an ability converts the rotational motion of cam 61 to the ascend curve of plunger 69 uniform motion in a straight line, recession curve that makes plunger 69 returning positions and a transition curve that is connected ascend curve and recession curve, is provided with rounding off line (not shown) in two adjacent curve joints.In order to improve fluid pressure stability, the trimming curve (not shown) can be set at the two end part of ascend curve.
The helical pitch of ascend curve is r=4v/n π D
2, lift angle θ=360 of ascend curve °/n, wherein v representes that cam 61 rotates the discharge capacity in a week, and D representes the diameter of plunger 69, and n representes the quantity of plunger 69, is the integer between the 2-10.Ascend curve is preferably the uniform pitch helix, can certainly be other the curve that can the rotational motion of cam 61 be converted to plunger 69 uniform motion in a straight line.
The helical pitch of recession curve must be identical with the helical pitch of ascend curve, i.e. the helical pitch r=4v/n π D of recession curve
2, recession curve can be the uniform pitch helix, also can be the other types curve.Transition curve can be a circular arc line, and helical pitch is zero.
Cam shown in Figure 4 is applicable to four Room parallel connections liquid chromatography pump embodiment, lift angle θ=90 of its ascend curve 611 °, and recession curve 612 corresponding angles are 30 °, transition curve 613 corresponding angles are 240 °.I.e. corresponding transition curve 613 in 612,120 ° of-360 ° of scopes of corresponding recession curve in 611,90 ° of-120 ° of scopes of corresponding ascend curve in 0 ° of-90 ° of scope of cam circumferencial direction.Certainly be under 90 ° of situation at the lift angle θ of ascend curve 611; Recession curve 612 corresponding angles are not limited to 30 °; Recession curve 612 corresponding angles all are feasible in 30 ° of-270 ° of scopes; When decline curve 612 corresponding angles were 270 °, cam curve just only had ascend curve 611 and recession curve 612, and does not have transition curve 613.When actual design is used; The lift angle θ of ascend curve 611 is under 90 ° of situation; Usually the angle of recession curve 612 correspondences is in 30 ° of-55 ° of scopes; The angle of transition curve 613 correspondences is in 215 ° of-240 ° of scopes, and assurance recession curve 612 corresponding angles are 270 ° with transition curve 613 corresponding angle sums.
As shown in Figure 5; Four Room parallel connection liquid chromatography pump embodiment in the parallelly connected liquid chromatography pump of the present invention; Comprise the reciprocal conveying mechanism that a cam as shown in Figure 4 61, pump head 65,4 cover are parallel to each other and be used for the cam drive mechanism (not shown) that driving cam rotates, like stepper motor etc.Its cam 61 has the side with cam curve that the reciprocal conveying mechanism of a camshaft 60,4 covers is arranged in cam, and arranges evenly that at circumferencial direction their center line all is parallel to the center line of camshaft 60.
Be provided with 4 separate pump chambers in the pump head 65, each pump chamber is communicated with an inlet opening and an outage.An one-way valve is installed in inlet opening and the outage separately.4 plungers in the reciprocal conveying mechanism of 4 covers stretch into respectively in 4 pump chambers, with it cooperating.Parallel connections liquid chromatography pump in four Room refers to has only a cam in this pump, have only one to rise curve, one and fall curve and a transition curve on this cam, and these three arrangement of curves are in 360 ° of scopes of cam face; The pump head of this pump has 4 separate pump chambers, and 4 continuous successively drains of pump chamber are in the downstream mechanism of liquid chromatograph; Has the reciprocal conveying mechanism of 4 covers in this pump.This four Room parallel connection liquid chromatography pump main characteristics is: under the prerequisite that the revolution discharge capacity is set, can the lift of reciprocal conveying mechanism be reduced 4 times, thereby increase substantially the working life of pump.
Only be designed with a pump head in the four Room parallel connection liquid chromatography pump of present embodiment, this can reduce the volume of parallelly connected liquid chromatography pump on the one hand; Make that on the other hand installation of the present invention is very convenient, benefit the assurance installation precision, and good installation precision is beneficial to equally and improves fluid pressure stability.Certainly also can be designed among the present invention and the reciprocal identical a plurality of pump head forms of conveying mechanism quantity, a pump chamber, an inlet opening and an outage are set in each pump head.
The reciprocal conveying mechanism of every cover comprises a plug push rod 63, a plunger 69 and a supporting roller 62.
Supporting roller 62 is truncated cone, and cone angle is α.Be provided with central shaft 621 at supporting roller 62 middle positions.The cam curve contact matching of this supporting roller 62 and cam 61.
One end of plunger push rod 63 is fixedly connected with the plunger coaxial with it 69, and the other end is fixedly connected with plug.The other end of plunger push rod 63 extend in the pump chamber of pump head 65, between plunger push rod 63 and pump head 65, is provided with the seal element (not shown), and seal element and installation thereof can be identical with existing technology, repeat no more here.
Like Fig. 6, shown in Figure 7, the plug of plunger push rod 63 the other ends in the present embodiment comprises that 631, two pins of pin 631 of two positioned opposite are middle for being used to hold the groove of supporting roller 62.The two ends of the central shaft 621 of supporting roller 62 are supported on two pin 631 inboards respectively rotationally.Angle β=90 between the central shaft 621 of supporting roller 62 and the center line of plunger push rod 63 °-α/2, α is the cone angle of taper supporting roller 62; That is to say the central shaft 621 and non-perpendicular being installed on two pins 631 of supporting roller 62; But the angle beta that tilts; Its purpose is to guarantee that the girth ratio of circumference and the cam curve of opposite position of arbitrary cross section of supporting roller 62 is constants; This constant can be a positive integer, also can be decimal; Furtherly, inconsistent phenomenon such as when truncated cone supporting roller 62 rolls on cam 61, can not twist.For example, the circumference of circle 622 is 0.3 with the girth ratio of cam 61 inner rings 617 at the bottom of the awl of supporting roller 62, and the circumference of the vertex of a cone circle 623 of supporting roller 62 is 0.3 with the girth of cam 61 outer rings 618 than also.
In addition; The angle of angle γ between the center line of the groove floor of pin 631 and plunger push rod 63 can be designed as 90 °-α; Can make plug and supporting roller 62 this part structure compact more like this, be beneficial to the volume that reduces pump, and be of value to the quality of fit that guarantees supporting roller 62 and cam 61.
If plunger push rod 63 ends are not provided with plug, supporting roller 62 also can otherwise be rotatably installed in plunger push rod 63 ends, as long as can guarantee that supporting roller 62 can be repeatedly and the cam curve contact matching work of cam 61.
Cam shown in Figure 8 is applicable to three Room parallel connections liquid chromatography pump embodiment, lift angle θ=120 of its ascend curve 611 °, and recession curve 612 corresponding angles are 40 °, transition curve 613 corresponding angles are 200 °.I.e. corresponding transition curve 613 in 612,160 ° of-360 ° of scopes of corresponding recession curve in 611,120 ° of-160 ° of scopes of corresponding ascend curve in 0 ° of-120 ° of scope of cam circumferencial direction.Certainly be under 120 ° of situation at the lift angle θ of ascend curve 611; Recession curve 612 corresponding angles are not limited to 40 °; Recession curve 612 corresponding angles all are feasible in 40 ° of-240 ° of scopes; When decline curve 612 corresponding angles were 240 °, cam curve just only had ascend curve 611 and recession curve 612, and does not have transition curve 613.When actual design is used; The lift angle θ of ascend curve 611 is under 120 ° of situation; Usually the angle of recession curve 612 correspondences is in 40 ° of-60 ° of scopes; The angle of transition curve 613 correspondences is in 200 ° of-180 ° of scopes, and assurance recession curve 612 corresponding angles are 240 ° with transition curve 613 corresponding angle sums.
No matter above-mentioned be in the cam shown in Figure 4; Still in the cam shown in Figure 8; In order to reduce the fluid pressure fluctuation, can be under theoretical value (being 120 ° among Fig. 8, is 90 ° among Fig. 4) prerequisite in the corresponding angle of the ascend curve of cam curve as the case may be; 1 °-5 ° or lag behind 1 °-5 ° in advance, the curve pairing angle adjacent with this ascend curve correspondingly lags behind or 1 °-5 ° in advance.Angular advance that ascend curve is corresponding or hysteresis are corresponding with at the ascend curve two end part trimming curve being set, and the angle that just on the corresponding angle basis of ascend curve, shifts to an earlier date or the angle of hysteresis are corresponding to the shared angle of trimming curve.
Have the pump head 55 of 3 independent pump chambers and be used for the cam drive mechanism that driving cam rotates by cam shown in Figure 8,3 cover reciprocal conveying mechanisms and one and can form three Room parallel connection liquid chromatography pump jointly.This three Room parallel connection liquid chromatogram pump structure only is with four Room parallelly connected liquid chromatogram pump structure difference shown in Figure 5: it has the reciprocal conveying mechanism of 3 covers; The lift angle of the ascend curve in its cam curve is 120 °; Its pump head has 3 independent pump chambers, and all the other same sections repeat no more.
In the parallelly connected liquid chromatography pump of the present invention, reciprocal conveying mechanism is not limited to 4 covers, and its quantity is that 2 covers, 3 overlap, 6 covers, 8 overlap, 10 covers all are feasible; But back and forth the lift angle of the quantity of conveying mechanism and the ascend curve in the cam curve will satisfy relation: θ=360 °/n, with the continuity of assurance feed flow.
Below to the comparison in the liquid chromatography pump design of parallelly connected liquid chromatography pump of the present invention and existing several types as directed.
One, flow one timing, the comparison of the plunger stroke of various types of liquid chromatography pumps
Suppose per minute fluid flow v=1ml/min, plunger diameter D=3.175mm, the cam rotating speed is 20 commentaries on classics/min, asks the plunger stroke of several kinds of pumps.
By the design specified criteria,
Single plunger cross sectional area=3.14159* (3.175/2) 2=7.917 (mm) 2............ inference 1
Pump revolution total displacement=1ml/min/20 commentaries on classics/min=50 μ l/ changes ... ... ... .... inference 2
All plunger revolution total kilometres=50 μ l/ change/7.917 (mm) 2=6.315284mm/ and change ... inference 3
(1) designing and calculating of the plunger stroke among the parallel connection of four Room among the present invention liquid chromatography pump embodiment
As shown in Figure 5, among the four Room parallel connection liquid chromatography pump embodiment of the present invention, the lift angle of ascend curve in the cam curve; Be that the pairing angle of ascend curve is 90 °; Recession curve the angle falls, the pairing angle of recession curve is 30 °, the angle that transition curve is corresponding is 240 °; The helical pitch of falling journey of the lift of ascend curve and recession curve is identical, and the helical pitch of transition curve is zero.During four Room parallel connection liquid chromatogram pump work, stepper motor drives cam 61 rotations, promotes 4 plunger push rods 63 successively through truncated cone supporting roller 62 and drives corresponding plunger 69 reciprocal uniform motion in a straight line.Because the lift angle of ascend curve is 90 °, so rotate in the process in a week, a plunger 69 reciprocal uniform motion in a straight line is always arranged all the time, thereby accomplish accurately supplying with continuously the required mobile phase of system at cam 61.
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/4=1.579mm/ changes .... conclusion 1.1
(2) designing and calculating of the plunger stroke among the parallel connection of three Room among the present invention liquid chromatography pump embodiment
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/3=2.105mm/ changes .... conclusion 1.2
The designing and calculating of the plunger stroke of (three) 180 ° of single cam parallel connection liquid chromatography pumps (Fig. 1)
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/2=3.1576mm/ changes .... conclusion 1.3
The designing and calculating of the plunger stroke of (four) 120 ° of single cam parallel connection liquid chromatography pumps (Fig. 2)
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/3=2.1051mm/ changes
... conclusion 1.4
The designing and calculating of the plunger stroke of (five) 180 ° of double-cam liquid chromatography pumps (Fig. 3)
The plunger stroke of (1) 180 ° of double-cam parallel connection liquid chromatography pump
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/2=3.1576mm/ changes .... conclusion 1.5
The plunger stroke of (2) 180 ° of double-cam series connection liquid chromatography pumps
According to inference 1, inference 2, inference 3,
: the stroke of each plunger revolution=6.315284mm/ commentaries on classics/1=6.315284mm/ changes
... conclusion 1.6
Brief summary:
According to conclusion 1.1, conclusion 1.2, conclusion 1.3, conclusion 1.4, conclusion 1.5, conclusion 1.6; Be not difficult to find out; At flow one regularly, the stroke of the parallel connection of four Room among the present invention liquid chromatography pump embodiment's single plunger revolution can be significantly less than the stroke of single plunger revolution in the liquid chromatography pump of each traditional type.
As noted earlier: the working life of the seal element between the plunger pump head is directly related with the stroke of plunger and operating frequency.When discharge capacity was identical, the stroke of the plunger in the parallelly connected liquid chromatography pump of the present invention was little, but several times improve the working life of parallelly connected liquid chromatography pump.In other words: parallelly connected liquid chromatography pump of the present invention was compared with the parallelly connected liquid chromatography pump of various traditional types on working life, will occupy absolute advantage.
Two, plunger stroke one timing, the comparison of the flow design of various types of liquid chromatography pumps
The stroke s=3.1576mm/ that supposes single plunger revolution changes, plunger diameter D=3.175mm, and the cam rotating speed is 20 commentaries on classics/min, asks the flow of several kinds of liquid chromatography pumps.
By the design specified criteria,
Plunger cross-section area=3.14159* (3.175/2) 2=7.917 (mm) 2................ inference 2.1
The flow of each plunger revolution=3.1576*7.917=25 μ l/ changes ... ... ... inference 2.2
The flow of each plunger per minute=20 commentaries on classics/min*25 μ l/ commentaries on classics=5ml/min......... inferences 2.3
(1) designing and calculating of three Room parallel connection liquid chromatography pump embodiment per minute flow of the present invention
According to inference 2.1, inference 2.2, inference 2.3,
; Flow=the 3*5ml/min=15ml/min of three Room parallel connection liquid chromatography pump per minute
... .. conclusion 2.1
(2) designing and calculating of four Room parallel connection liquid chromatography pump embodiment per minute flow of the present invention
According to inference 2.1, inference 2.2, inference 2.3,
: the flow=4*5ml/min=20ml/min of four Room parallel connection liquid chromatography pump per minute
... .. conclusion 2.2
The designing and calculating of (three) 180 ° of single cam parallel connection liquid chromatography pump (Fig. 1) flows
According to inference 2.1, inference 2.2, inference 2.3,
: the flow=2*5ml/min=10ml/min of 180 ° of single cam parallel connection liquid chromatography pump per minutes
.... conclusion 2.3
The designing and calculating of (four) 120 ° of single cam parallel connection liquid chromatography pump (Fig. 2) flows
According to inference 2.1, inference 2.2, inference 2.3,
: the flow=3*5ml/min=15ml/min of 120 ° of single cam parallel connection liquid chromatography pump per minutes
.... conclusion 2.4
The designing and calculating of (five) 180 ° of double-cam liquid chromatography pumps (Fig. 3) flow
The flow of (1) 180 ° of double-cam parallel connection liquid chromatography pump
According to inference 2.1, inference 2.2, inference 2.3,
: double-cam parallel-connected pumps 20 commentaries on classics/min flow=2*5ml/min=10ml/min......... conclusion 2.5
The flow of (2) 180 ° of double-cam series connection liquid chromatography pumps
According to inference 2.1, inference 2.2, inference 2.3,
: double-cam pumps in series 20 commentaries on classics/min flow=1*5ml/min=5ml/min.......... conclusion 2.6
Brief summary:
According to conclusion 2.1, conclusion 2.2, conclusion 2.3, conclusion 2.4, conclusion 2.5, conclusion 2.6; Be not difficult to find out; In plunger stroke one regularly; The liquid supply rate meeting of parallelly connected liquid chromatography pump of the present invention is obviously greater than the parallelly connected liquid chromatography pump of each traditional type, and is this in the coabsolute advantage of liquid supply rate, can bring the liquid chromatogram application more vast imagination space.
What in sum, parallelly connected liquid chromatography pump of the present invention brought to us is completely new concept.The application of end cam in parallelly connected liquid chromatography pump makes the multicell parallel connection of liquid chromatography pump be integrated into a limited space, not only reduced the volume of chromatogram pump, and main is the design difficulty that has reduced cam significantly, improved fluid pressure stability.
Though described the present invention with reference to several exemplary embodiments, should be appreciated that used term is explanation and exemplary and nonrestrictive term.Because the present invention's practical implementation and do not break away from the spirit or the essence of invention in a variety of forms; So be to be understood that; The foregoing description is not limited to any aforesaid details; And should in enclose spirit that claim limited and scope, explain widely, therefore fall into whole variations and remodeling in claim or its equivalent scope and all should be the claim of enclosing and contain.
Claims (12)
1. parallelly connected liquid chromatography pump; Comprise have camshaft (60) cam (61), pump head (65), at least two reciprocal conveying mechanisms of cover and be used to drive the cam drive mechanism that said cam (61) rotates; The inlet opening and the outage that be provided with pump chamber in the said pump head (65), are communicated with this pump chamber; The reciprocal conveying mechanism of said every cover comprises plunger push rod (63), be fixedly connected on these plunger push rod (63) one ends and the plunger (69) coaxial with it, be installed in the supporting roller (62) of said plunger push rod (63) the other end rotationally; The other end of said plunger (69) stretches in the pump chamber of said pump head (65) cooperating with it; Said supporting roller (62) is worked with the cam curve contact matching of said cam (61); It is characterized in that: said cam (61) is an end cam, and its cam curve is arranged on the other end opposite with the end face with camshaft (60), and said cam curve comprises ascend curve that can the rotational motion of said cam (61) be converted to said plunger (69) uniform motion in a straight line and a recession curve that makes said plunger (69) returning position; The helical pitch of said ascend curve and said recession curve is identical, is r=4v/n π D
2, lift angle θ=360 of said ascend curve °/n, wherein v representes that said cam (61) rotates said parallelly connected liquid chromatogram pump delivery of a week, and D representes the diameter of said plunger (69), and n representes the quantity of plunger (69), and n is the integer between the 2-10; The reciprocal conveying mechanism of said at least two covers is arranged in the side with cam curve of said cam, and arranges evenly that at circumferencial direction their center line all is parallel to the center line of said camshaft (60); Said supporting roller (62) is a truncated cone, and the circumference of any two cross sections of this supporting roller (62) equates with the ratio of the girth of the cam curve of opposite position.
2. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: said cam curve also comprises the transition curve that connects said ascend curve and said recession curve.
3. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: the two end part of the ascend curve in the said cam curve are provided with trimming curve respectively.
4. parallelly connected liquid chromatography pump as claimed in claim 3 is characterized in that: the joint of two adjacent curves is provided with the rounding off line in the said cam curve.
5. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: said ascend curve is the uniform pitch helix; Said recession curve is the uniform pitch helix.
6. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: the quantity of said reciprocal conveying mechanism is 3 covers; Lift angle θ=120 of said ascend curve °, the angle that said recession curve is corresponding is 240 °.
7. parallelly connected liquid chromatography pump as claimed in claim 2 is characterized in that: the quantity of said reciprocal conveying mechanism is 3 covers; Lift angle θ=120 of said ascend curve °, the angle that said recession curve is corresponding is 40 °-60 °.
8. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: the quantity of said reciprocal conveying mechanism is 4 covers; Lift angle θ=90 of said ascend curve °, the angle that said recession curve is corresponding is 270 °.
9. parallelly connected liquid chromatography pump as claimed in claim 2 is characterized in that: the quantity of said reciprocal conveying mechanism is 4 covers; Lift angle θ=90 of said ascend curve °, the angle that said recession curve is corresponding is 30 °-55 °.
10. parallelly connected liquid chromatography pump as claimed in claim 1 is characterized in that: the quantity of said pump head (65) is one, is provided with in it and the reciprocal identical and separate pump chamber of conveying mechanism quantity, and each pump chamber is communicated with an inlet opening and an outage; At least two plungers (69) in described at least two reciprocal conveying mechanisms stretch into respectively in the corresponding pump chamber in the said pump head (65), with it cooperating.
11. parallelly connected liquid chromatography pump as claimed in claim 1; It is characterized in that: plunger push rod (63) end in the said reciprocal conveying mechanism is fixedly connected with a plug; This plug comprises the pin (631) of two positioned opposite; Be to be used to hold the groove of said supporting roller (62) in the middle of two pins (631); The two ends of the central shaft of said supporting roller (62) are supported on two said pins (631) inboard respectively rotationally, angle β=90 between the central shaft (621) of said supporting roller (62) and the center line of said plunger push rod (63) °-α/2, and α is the cone angle of said truncated cone supporting roller (62).
12. parallelly connected liquid chromatography pump as claimed in claim 11 is characterized in that: angle γ=90 between the center line of the bottom surface of the groove of said pin (631) and said plunger push rod (63) °-α.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910209048 CN102052275B (en) | 2009-10-30 | 2009-10-30 | Parallel liquid phase chromatographic pump |
| PCT/CN2010/001723 WO2011050585A1 (en) | 2009-10-30 | 2010-10-29 | Parallel liquid chromatographic pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910209048 CN102052275B (en) | 2009-10-30 | 2009-10-30 | Parallel liquid phase chromatographic pump |
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| CN102052275A CN102052275A (en) | 2011-05-11 |
| CN102052275B true CN102052275B (en) | 2012-10-10 |
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| WO (1) | WO2011050585A1 (en) |
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| CN104047823B (en) * | 2014-06-12 | 2016-06-29 | 陕西科技大学 | The multi-cylinder bidirectional ram pump that a kind of cylindrical cam drives |
| JP6082722B2 (en) * | 2014-10-14 | 2017-02-15 | 株式会社タクミナ | Reciprocating pump |
| EP3402987B1 (en) * | 2016-01-11 | 2019-10-23 | National Oilwell Varco, L.P. | Direct drive pump assemblies |
| CN105756898B (en) * | 2016-04-28 | 2018-03-30 | 上海肇民动力科技有限公司 | Vavuum pump |
| US10480547B2 (en) | 2017-11-30 | 2019-11-19 | Umbra Cuscinetti, Incorporated | Electro-mechanical actuation system for a piston-driven fluid pump |
| US11035348B2 (en) | 2018-08-28 | 2021-06-15 | National Oilwell Varco, L.P. | Reciprocating pumps having a pivoting arm |
| CN110469479A (en) * | 2019-08-21 | 2019-11-19 | 中山致安化工科技有限公司 | Pump transmission device and delivery pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385608A (en) * | 2002-06-24 | 2002-12-18 | 胡松海 | Plane cam for high-pressure plunger type water pump cleaning machine |
| CN1459004A (en) * | 2000-09-15 | 2003-11-26 | 挪威国立奥伊威尔有限公司 | Arrangement at piston engine and method of controlling the pistons |
| EP1635059A2 (en) * | 2004-09-13 | 2006-03-15 | Haldex Brake Corporation | Reciprocating axial displacement device |
| CN101035984A (en) * | 2004-10-06 | 2007-09-12 | 西门子公司 | Radial piston pump with a roller plunger |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2504001B2 (en) * | 1986-10-14 | 1996-06-05 | 横河電機株式会社 | Liquid transfer device |
| US5988987A (en) * | 1996-08-28 | 1999-11-23 | Fia Solutions, Inc. | Method for merging and/or ratio blending aliquant |
| WO2003079000A1 (en) * | 2002-03-18 | 2003-09-25 | Hitachi High-Technologies Corporation | Gradient liquid feed pump system, and liquid chromatograph |
| JP4086001B2 (en) * | 2004-03-25 | 2008-05-14 | 株式会社島津製作所 | Liquid chromatograph pump |
-
2009
- 2009-10-30 CN CN 200910209048 patent/CN102052275B/en active Active
-
2010
- 2010-10-29 WO PCT/CN2010/001723 patent/WO2011050585A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1459004A (en) * | 2000-09-15 | 2003-11-26 | 挪威国立奥伊威尔有限公司 | Arrangement at piston engine and method of controlling the pistons |
| CN1385608A (en) * | 2002-06-24 | 2002-12-18 | 胡松海 | Plane cam for high-pressure plunger type water pump cleaning machine |
| EP1635059A2 (en) * | 2004-09-13 | 2006-03-15 | Haldex Brake Corporation | Reciprocating axial displacement device |
| CN101035984A (en) * | 2004-10-06 | 2007-09-12 | 西门子公司 | Radial piston pump with a roller plunger |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2001-20833A 2001.01.23 |
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| WO2011050585A1 (en) | 2011-05-05 |
| CN102052275A (en) | 2011-05-11 |
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