CN205064208U - Liquid chromatogram high -pressure transfusion pump that connects in parallel - Google Patents
Liquid chromatogram high -pressure transfusion pump that connects in parallel Download PDFInfo
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- CN205064208U CN205064208U CN201520517028.2U CN201520517028U CN205064208U CN 205064208 U CN205064208 U CN 205064208U CN 201520517028 U CN201520517028 U CN 201520517028U CN 205064208 U CN205064208 U CN 205064208U
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- liquid chromatogram
- high voltage
- infusion pump
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Abstract
The utility model provides a liquid chromatogram high -pressure transfusion pump that connects in parallel relates to chromatogram detection area, liquid chromatogram high -pressure transfusion pump that connects in parallel includes two the same pump heads, and the reciprocal liquor charging mechanism that two structures are the same that is connected respectively with two pump heads is still including fixed subassembly, driven subassembly and three drive arrangement, one of them drive arrangement and fixed subassembly rigid coupling for drive driven subassembly reciprocating motion, the driven subassembly includes connecting piece, two flat -plate -shaped translating cams and two adjusting blocks that the shape is the same, two translating cam symmetries set up, rotate with the connecting piece respectively and are connected, two same curb plate faces of translating cam respectively with the gyro wheel butt of two reciprocal liquor charging mechanisms, the opposite side face respectively with two adjusting block butts, two adjusting block symmetries set up, two drive arrangement are used for driving two adjusting block reciprocating motion in addition. It is not enough that prior art middle finishing precision has been solved in this application, supplies the liquid measure, supplies the technical problem that the liquor ratio is routine, supply hydraulic pressure force and pressure fluctuation.
Description
Technical field
The utility model relates to chromatogram detection field, especially relates to a kind of liquid chromatogram parallel high voltage infusion pump.
Background technique
Existing liquid chromatogram high-pressure parallel lobe pump, as shown in Figure 4, comprising: reciprocal conveying mechanism 2, two cams 27 that consistent cylindrical cam 27, two nested structure of parallel connection of 180 degree each other of motor (not shown), pump main body 25 and two that pump main body 25 is fixedly connected with on all four pump heads 1, the camshaft 26 be connected with motor, two shapes be fixedly connected on camshaft 26 is identical are connected with two pump heads 1 respectively by a set of reciprocal conveying mechanism 2; The plunger 30 that reciprocal conveying mechanism 2 comprises plunger stem 28, plunger back seat 29 and is fixedly connected with plunger back seat 29, one end of plunger stem 28 is provided with roller 31; Two pump heads 1 have pump chamber and the inlet opening that is communicated with pump chamber and outage respectively; The inlet opening of pump head 1 and liquid outlet opening place are provided with feed liquor one-way valve and fluid individual event valve (not shown), and the feed liquor individual event valve of pump head 1 is connected with the solvent bottle of mobile phase by pipeline; Discharge opeing one-way valve is connected with detection system (not shown) by high-pressure transfusion tube, seal ring is provided with between pump head 1 and plunger 30, be arranged with Compress Spring 32 outside plunger back seat 29, Compress Spring 32 two ends head on the shaft shoulder of pump main body 25 and plunger back seat 29 respectively; The excircle of cam 27 is provided with one group of cam curve, this group cam curve comprises ascend curve and recession curve, ascend curve and recession curve are spiral of Archimedes, the end of the ascend curve of top another cylindrical cam 27 corresponding of the ascend curve of a cylindrical cam 27, the ascend curve angle of cylindrical cam is 180 degree.During feed flow, the ascend curve of cylindrical cam matches with corresponding roller, the feed liquor closed check valve on pump head, and feed flow one-way valve is opened, the converting rotary motion of cylindrical cam becomes the uniform motion in a straight line of plunger, pump head by feed flow one-way valve and high-pressure transfusion tube feed flow to system; After a pump head feed flow terminates, another pump head with same action to system feed flow; Cam axle one week, two groups of pump heads replace feed flow and imbibition, complete the alternately continuous print supply to mobile phase needed for system.
Here there is following problem inevitable: first, this liquid chromatogram high-pressure parallel lobe pump in a low voltage state, the uniform motion in a straight line when converting rotary motion of cylindrical cam becomes corresponding plunger to infuse, promotes two plunger alternations, then can obtain level and smooth output liquid stream.And under the condition of high pressure and ultrahigh pressure, temperature-resistant, pressure can increase with by the reduction of compressed liquid volume.Under the effect of high pressure, ultrahigh pressure, liquid be have compressed, along with plunger propelling at the uniform velocity, can be more and more less by the liquid volume compressed in pump chamber, and it is increasing that pressure can become thereupon.Replace in the process of feed flow at two pump heads, will inevitably produce regular pressure pulsation as sine wave, the liquid supply rate accuracy and the repeatability that result in pump are all poor.In order to reduce pulse, prior art is the lifting rate by reducing each stroke, namely reduces the stroke of plunger, improves the rotating speed of motor and camshaft simultaneously, thus improves that the frequency of the back and forth movement of plunger and movement velocity realize.But the raising of the motion frequency of plunger and movement velocity can accelerate the wearing and tearing of the associated components such as seal ring, affect the life-span of pump.
Secondly: current liquid chromatogram high-pressure parallel lobe pump, the scope of use is restricted all to a great extent.As: cam design is complete, and after assembling is shaped, the maximum lift of cam is certain, and the feed flow that camshaft often circles is exactly certain, cannot adjust again; The curve of cam is certain, and the indices of cam pump also just determines, and comprises pulsation, repeatability, accuracy, liquid supply pressure etc.Want to change, can only curve be redesigned; The curve of cam is certain, and in the face of the Protean mobile phase having different compressibility coefficient, cam pump can seem such helpless under the condition of high pressure or ultrahigh pressure; The design of each assembly of current pump is nearly all man-to-man, not by simply changing certain assembly to change the function of pump.
Have again: design two cams of current liquid chromatogram parallel high voltage infusion pump are duplicate 180 degree each other, this makes high pressure pump generally only carry a kind of liquid, even if can carry two kinds of liquid, the ratio of two kinds of liquid can only be 1:1, which limits the using scope of pump.
Also have: the design of current liquid chromatogram parallel high voltage infusion pump, ubiquity the fatal problem of manufacturability difference.In other words, the design of some high pressure pumps at present, in order to meet the technological requirement of following process and assembling, has to reduce designing requirement.Make high pressure pump, from design, just do not reach usage requirement; The design of high pressure pump meets usage requirement but because manufacturability poor, processing and assemble can not meet designing requirement again.Should say, current liquid chromatogram parallel high voltage infusion pump, from the problem being designed into processing, assembly process process difference, be the yoke that China's liquid chromatogram high pressure pump is drawn close to advanced international standard.
Based on this, the utility model provides a kind of liquid chromatogram parallel high voltage infusion pump to solve above-mentioned technical problem.
Model utility content
The purpose of this utility model is to provide a kind of liquid chromatogram parallel high voltage infusion pump, poor with the technology capability solving liquid chromatogram high-pressure parallel lobe pump in prior art, machining accuracy is inadequate, the liquid supply rate accuracy of pump, poor repeatability, liquid supply rate, the technical problem that can not regulate for liquid proportional, liquid supply pressure and pressure pulsation.
A kind of liquid chromatogram parallel high voltage infusion pump is embodiments provides of the present utility model, described liquid chromatogram parallel high voltage infusion pump comprises two identical pump heads, and the reciprocal conveying mechanism identical with two structures that two pump heads connect respectively, this pump also comprises fixing-assembly, driven subassembly and three drive units; Two described reciprocal conveying mechanisms are fixedly connected with described fixing-assembly respectively; Drive unit described in one of them is fixedly connected with described fixing-assembly, for driving described driven subassembly along the direction to-and-fro motion perpendicular to two described reciprocal conveying mechanisms;
Described driven subassembly comprises link, adjustment block that flat wedge cam that two shapes are identical is identical with two shapes;
Two described wedge cams are symmetrical arranged, and are rotationally connected with described link respectively, and rotating shaft is positioned at two described wedge cams one end close to each other; The roller of the plate face of two described wedge cam the same sides reciprocal conveying mechanism described with two respectively abuts; The plate face of two described wedge cam opposite sides abuts with two described adjustment blocks respectively;
Two described adjustment blocks are symmetrical arranged, the symmetry axis conllinear of its symmetry axis and two described wedge cams;
Drive unit described in two other and described link affixed, for driving two described adjustment blocks along the direction to-and-fro motion being parallel to described symmetry axis.
Optionally, three described drive units are motor.
Optionally, described link comprises flat first joint and the second joint; Two described wedge cams are rotationally connected by rotating shaft and described first joint, and two described rotating shafts are perpendicular to described first joint; Described first joint is vertical affixed with one of them plate face of described second joint; Motor described in one of them and described fixing-assembly affixed, its driveshaft adopts thread screw to be connected with described second joint.
Optionally, described liquid chromatogram parallel high voltage infusion pump also comprises driven unit, and described driven unit is provided with upper and lower two parallel slide rails, and another plate face of described second joint is provided with the slide block matched with described slide rail; Described slide block and described slide rail are slidably connected.
Optionally, described in corresponding every bar, slide rail is provided with two slide blocks.
Optionally, the driveshaft of another two described motors adopts thread screw to be connected with two described adjustment blocks respectively.
Optionally, described fixing-assembly is provided with vent hole near three described motor places.
Optionally, the bearing surface of two described adjustment blocks and two described wedge cams is arc surface.
Optionally, two described wedge cams are rectangular.
Optionally, described fixing-assembly comprises fixed base, two described reciprocal conveying mechanisms and described fixed base affixed.
The described liquid chromatogram parallel high voltage infusion pump that the utility model provides, pump head and the reciprocal conveying mechanism of maintenance existing equipment are constant.Be provided with two mutual wedge cams also symmetrical mutually at an angle, by the driving of drive unit described in one of them, do reciprocal straight line motion along the direction perpendicular to two described reciprocal conveying mechanisms, travelling speed is uniform motion.In the starting stage, two wedge cams are identical angle with two described reciprocating structures, and the position of contact is also identical respectively, along with moving back and forth of two described wedge cams, is transformed into the uniform motion in a straight line of plunger.Owing to there is angle, described in one of them, wedge cam is along with straight line motion, continuous forward with the contact position of the roller of described reciprocal conveying mechanism, thus promotes forward plunger motion, orders about pump head feed flow.Described in another, wedge cam is along with straight line motion, continuous backward with the contact position of the roller of conveying mechanism reciprocal described in another, thus promotion plunger moves backward, orders about another pump head imbibition.After a pump head feed flow terminates, another pump head with same action to system feed flow; Once, two groups of pump heads replace feed flow and imbibition in two described wedge cam to-and-fro motion, complete the alternately continuous print supply to mobile phase needed for system.
As liquid supply rate and the liquid supply pressure of liquid chromatogram parallel high voltage infusion pump as described in need adjusting, can described drive unit be passed through, the travelling speed of adjustment two described wedge cams and stroke, and then play the object changing liquid supply rate and liquid supply pressure.When travelling speed and stroke one timing of two described wedge cams, also by drive unit described in two other, adjust two described adjustment blocks forward or backward, change the angle of two described wedge cams, thus change the stroke of the plunger of two described reciprocal conveying mechanisms, change liquid supply rate and liquid supply pressure further.Same principle, can, with strengthening or reducing the pressure pulsation that the travelling speed of two described wedge cams and stroke and angle adjust pump, make the accuracy of the liquid supply rate of pump and repeatability reach higher level.
As Liquid transfer ratio need be changed, only need adjust adjustment block described in one of them, thus change the liquid supply rate of one of them liquid, and then change the conveying ratio of two kinds of liquid.
The application can also by control to two described adjustment blocks, the plunger uniform motion in a straight line described wedge cam move generate convert to accelerate or even acceleration, deceleration or even deceleration straight line motion, to meet the demand of various complex situations.
The described liquid chromatogram parallel high voltage infusion pump that the utility model provides, use two described wedge cams of changeable angle and travelling speed, to instead of in prior art two in the cylindrical cam of 180 degree, thus pass through angle and the travelling speed of change two described wedge cams, the liquid supply rate of whole pump, liquid supply pressure can be changed, supply the index such as liquid proportional, pressure pulsation.Meanwhile, flat described wedge cam, processing is simple, and machining accuracy is higher than cylindrical cam, and the described liquid chromatogram parallel high voltage infusion pump of the application can be made better than prior art technology capability, and machining accuracy is high.
Based on this, the utility model is than original technology, have that technology capability is good, machining accuracy is high, liquid supply rate accuracy, the repeatability of pump are high, liquid supply rate, can to regulate for liquid proportional, liquid supply pressure and pressure pulsation, pressure pulsation is little waits guardian technique advantage.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparent, accompanying drawing in the following describes is mode of executions more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of liquid chromatogram parallel high voltage infusion pump described in the present embodiment;
Fig. 2 is the structural representation of driven subassembly;
Fig. 3 is the structural representation that motor is connected with driven unit;
Fig. 4 is prior art structural representation;
Fig. 5 is the calculating schematic diagram of specific design citing.
Reference character:
1-pump head; The reciprocal conveying mechanism of 2-; 3-fixing-assembly;
4-driven subassembly; 5-first motor; 6-second motor;
7-the 3rd motor; 8-link; 9-wedge cam;
10-adjustment block; 11-first joint; 12-second joint;
13-rotating shaft; 14-driveshaft; 15-thread screw structure;
The upper slide rail of 16-; 17-glidepath; 18-slide block;
The upper slide rail fixed plate of 19-; 20-glidepath fixed plate; 21-connecting plate;
22-vent hole; The dust-proof barrier of 23-; 24-fixed base;
25-pump main body; 26-camshaft; 27-cam;
28-plunger stem; 29-plunger back seat; 30-plunger;
31-roller; 32-Compress Spring.
Embodiment
Be clearly and completely described the technical solution of the utility model below in conjunction with accompanying drawing, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
In description of the present utility model, it should be noted that, orientation or the position relationship of the instruction such as term " " center ", " on ", D score, "left", "right", " vertically ", " level ", " interior ", " outward " they be based on orientation shown in the drawings or position relationship; be only the utility model and simplified characterization for convenience of description; instead of instruction or imply the device of indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and such as, can be fixedly connected with, also can be removably connect, or the connection of one; Can be mechanical connection, also can be that electric welding connects; Can be directly be connected, also indirectly can be connected by intermediary, can be the connection of two element internals.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
Embodiment one
As Figure 1-4, provide a kind of liquid chromatogram parallel high voltage infusion pump in the present embodiment, described liquid chromatogram parallel high voltage infusion pump comprises two identical pump heads 1, and the reciprocal conveying mechanism 2 identical with two structures that two pump heads 1 connect respectively, this pump also comprises fixing-assembly 3, driven subassembly 4 and three drive units.Preferred three described drive units are motor (describe for ease of distinguishing and understand, three motors separately mark, for driving the first motor 5 of driven subassembly, for driving the second motor 6 and the 3rd motor 7 of two adjustment blocks).Two described reciprocal conveying mechanisms 2 are fixedly connected with described fixing-assembly 3 respectively.
Described driven subassembly 4 comprises the identical flat wedge cam 9 of link 8, two shapes adjustment block 10 identical with two shapes.
Two described wedge cams 9 are symmetrical arranged; The roller 31 of the plate face of two described wedge cam 9 the same sides reciprocal conveying mechanism 2 described with two respectively abuts; The plate face of two described wedge cam 9 opposite sides respectively adjustment block 10 described with two abuts.
Described link 8 comprises flat first joint 11 and the second joint 12; Two described wedge cams 9 are rotationally connected by rotating shaft 13 and described first joint 11, and rotating shaft 13 is positioned at two described wedge cams 9 one end close to each other.Two described rotating shafts 13 are perpendicular to described first joint 11; Described first joint 11 is vertical affixed with one of them plate face of described second joint 12; Described first motor 5 is affixed with described fixing-assembly 3, and its driveshaft 14 adopts thread screw structure 15 to be connected with described second joint 12, for driving described driven subassembly 4 along the direction to-and-fro motion perpendicular to two described reciprocal conveying mechanisms 2.
Two described adjustment blocks 10 are symmetrical arranged, the symmetry axis conllinear of its symmetry axis and two described wedge cams 9;
Two other drive unit second motor 6 and the 3rd motor 7 are affixed with described second joint 12 respectively, the driveshaft of the second motor 6 and the 3rd motor 7 respectively adjustment block 10 described with two adopts thread screw to be connected, for driving two described adjustment blocks 10 along the direction to-and-fro motion being parallel to described symmetry axis.
The described liquid chromatogram parallel high voltage infusion pump that the utility model provides, pump head 1 and the reciprocal conveying mechanism 2 of maintenance existing equipment are constant.Be provided with two mutual wedge cams 9 also symmetrical mutually at an angle, first motor 5 rotates, then by thread screw structure 15, drive described second joint 12 linearly to-and-fro motion, thus drive whole described driven subassembly 4 to do reciprocal straight line motion along the direction perpendicular to two described reciprocal conveying mechanisms 2.By controlling the rotating speed of the first motor 5, control travelling speed is uniform motion.In the starting stage, two wedge cams 9 are identical angle with two described reciprocating structures, and the position of contact is also identical respectively, along with moving back and forth of two described wedge cams 9, is transformed into the uniform motion in a straight line of plunger 30.Owing to there is angle, described in one of them, wedge cam 9 is along with straight line motion, with the contact position of the roller 31 of described reciprocal conveying mechanism 2 constantly forward (herein forward namely if Compress Spring in Fig. 4 32 is by the direction compressed, be the direction that Compress Spring 32 bounces back backward), thus promotion plunger 30 travels forward, and orders about pump head 1 feed flow.Described in another, wedge cam 9 is along with straight line motion, continuous backward with the contact position of the roller 31 of conveying mechanism 2 reciprocal described in another, thus promotion plunger 30 moves backward, orders about another pump head 1 imbibition.After pump head 1 feed flow terminates, another pump head 1 with same action to system feed flow; Once, two groups of pump heads 1 replace feed flow and imbibition to the to-and-fro motion of two described wedge cams 9, complete the alternately continuous print supply to mobile phase needed for system.
As liquid supply rate and the liquid supply pressure of liquid chromatogram parallel high voltage infusion pump as described in need adjusting, the rotating speed of control first motor 5 and the stroke of drive screw can be passed through, adjust travelling speed and the stroke of two described wedge cams 9, and then play the object changing liquid supply rate and liquid supply pressure.When travelling speed and stroke one timing of two described wedge cams 9, also pass through the driving stroke of control second motor 6 and the 3rd motor 7 pairs of screw rods, adjust two described adjustment blocks 10 forward or backward, change the angle of two described wedge cams 9, thus change the stroke of the plunger 30 of two described reciprocal conveying mechanisms 2, change liquid supply rate and liquid supply pressure further.Same principle, can, with strengthening or reducing the pressure pulsation that the travelling speed of two described wedge cams 9 and stroke and angle adjust pump, make the accuracy of the liquid supply rate of pump and repeatability reach higher level.
As Liquid transfer ratio need be changed, only need adjust adjustment block 10 described in one of them, change the angle of corresponding described wedge cam 9, thus change the liquid supply rate of one of them liquid, and then change the conveying ratio of two kinds of liquid.
The application can also pass through the rotating speed of adjustment second motor 6 and the 3rd motor 7, change the travelling speed of two described adjustment blocks 10, plunger 30 uniform motion in a straight line described wedge cam 9 being moved generate converts the straight line motion of acceleration or even acceleration, deceleration or even deceleration to, to meet the demand of various complex situations.
When the first motor 5 turns to, the motion of driven subassembly 4 has one by being decelerated to stopping, again by the process stopping to acceleration.Pressure Drop now and the loss of flow, compensated by the angle adjusting wedge cam 9 by the second motor 6 and the 3rd motor 7, make up the first motor 5 and occur when turning to stopping caused pressure degradation phenomenon wink.
If there is the plunger forward compression because of reciprocal conveying mechanism, liquid volume in pump chamber progressively reduces and causes pressure to rise gradually, time situation (likely occurring when high pressure or ultrahigh pressure) that pulsation strengthens, the mode that the angle that can reduce wedge cam 9 by trace makes the uniform motion in a straight line of plunger become uniformly retarded motion solves.Meanwhile, the stroke of suitable increasing driven subassembly 4, in order to ensure the accuracy of pump displacement while reducing pressure pulsation.
The described liquid chromatogram parallel high voltage infusion pump that the utility model provides, use two described wedge cams 9 of changeable angle and travelling speed, to instead of in prior art two in the cam 27 of 180 degree, thus pass through angle and the travelling speed of the described wedge cam 9 of change two, the liquid supply rate of whole pump, liquid supply pressure can be changed, supply the index such as liquid proportional, pressure pulsation.Meanwhile, flat described wedge cam 9, processing is simple, and machining accuracy is higher than cylindrical cam, and the described liquid chromatogram parallel high voltage infusion pump of the application can be made better than prior art technology capability, and machining accuracy is high.
The described liquid chromatogram parallel high voltage infusion pump of the application, can control the rotating speed of three motors and the driving stroke to screw rod accurately by computer program, changes liquid supply rate, liquid supply pressure accurately, supplies the index such as liquid proportional, pressure pulsation.。
As Fig. 3, in the possibility of the present embodiment, described liquid chromatogram parallel high voltage infusion pump also comprises driven unit, described driven unit is provided with upper and lower two parallel slide rails, be designated slide rail 16 and glidepath 17 in figure, another plate face of described second joint 12 is provided with the slide block 18 matched with described slide rail; Described slide block 18 is slidably connected with slide rail.Preferably, described driven unit comprises slide rail fixed plate 19, glidepath fixed plate 20, connecting plate 21, described upper slide rail fixed plate 19, glidepath fixed plate 20 are vertical with connecting plate 21 affixed respectively, described upper slide rail 16 is affixed with described upper slide rail fixed plate 19, described glidepath 17 is affixed with described glidepath fixed plate 20, described glidepath fixed plate 20 is provided with vent hole 22, and described upper slide rail fixed plate 19 is provided with dust control by ventilation barrier 23, for dust control by ventilation.Described first motor 5 is affixed with described glidepath fixed plate 20, and described glidepath fixed plate 20 is affixed with fixing-assembly 3.The precision of rectilinear motion of described driven subassembly 4 is improved by slide rail and slide block.
Described in the every bar of further correspondence, slide rail is provided with two slide blocks.Arrange two slide blocks, precision of rectilinear motion is higher.
In the possibility of the present embodiment, described fixing-assembly 3 is provided with vent hole 22 near three motor places, is convenient to the heat radiation of motor.
As Fig. 1, in the possibility of the present embodiment, the bearing surface of two described adjustment blocks 10 and two described wedge cams 9 is arc surface.Be set to arc surface, described wedge cam 9 and the contact angle of described adjustment block 10 keep always 90 degree constant, be convenient to accurate Calculation.Illustrate: with the utility model, design a liquid chromatogram high-pressure parallel lobe pump.
The usage requirement of pump is analytic type high-pressure service pump, and conventional discharge capacity is 1ml/min, first designs pump parameter: if Fig. 5, s are that roller faces the distance of walking directly along wedge cam, m is the lift of plunger, and n is the crow flight distance that wedge cam 9 is walked.
1, design uses plunger diameter φ 3.175mm, plunger sectional area 7.917mm
2.
2, total lift=126.31mm of pump plunger.
3, establish the first motor to come and go number of times 20/min, then the discharge capacity that single comes and goes is 50 μ l.
Then have: 50*20=1000 (μ l/min)=1 (ml/min)
4, the lift of single-acting pump plunger: 50/7.917=6.316 (mm)
There are two mechanisms of back and forth infusing: single plunger lift m is 6.316/2=3.158mm
5, wedge cam 9 is set to be less than 30 ° as basic demand (pressure angle) with the angle of plunger center line,
Then have: s length=sin30 ° * 3.158mm=6.316mm
That is: s length need be greater than 6.316mm, can meet the basic demand to maximum pressure angle like this.
6, now getting wedge cam 9 straight line motion distance n is 20mm.
7, then have: 3.158/20=tan α=0.1579
α=8.973 ° are less than 30 °, eligible
8, roller faces the distance s moved directly along wedge cam:
＝20/cos8.97292°＝20/0.98776＝20.2478(mm)
9, inference: when the first motor to-and-fro motion 20mm, wedge cam 9 with rotating shaft 13 center be 0 o'clock with 20.2478 for radius, it is promoted 8.972920 forward by adjustment block 10, and when rectilinear path is 3.158mm, the one-stroke liquid supply rate of a pump is 25 μ l.
Two parallel connection of pumps feed flows are 1000 (μ l/min)
As Fig. 1, in the possibility of the present embodiment, two described wedge cams 9 are rectangular.Rectangular described wedge cam 9 is convenient to processing.
As Fig. 1, in the possibility of the present embodiment, described fixing-assembly 3 comprises fixed base 24, and two described reciprocal conveying mechanisms 2 are affixed with described fixed base 24.Preferred described fixed base 24 is rectangular.Composition graphs 3 can be seen, the liquid chromatogram parallel high voltage infusion pump designed by the utility model, is substantially built into plate, and is mostly slab.The processing of this combination and the manufacturability of assembling are extraordinary.In addition, in all component of traditional liquid chromatogram parallel high voltage cam pump, cam is one of parts of the most difficult design and processing.And in the utility model, play just two pieces of flat boards being very easy to design and processing of cam effect.This design, can realize the design concept of designer easily.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technological scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristics; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment's technological scheme of the utility model.
Claims (10)
1. a liquid chromatogram parallel high voltage infusion pump, comprises two identical pump heads, and the reciprocal conveying mechanism identical with two structures that two pump heads connect respectively, and it is characterized in that, this pump also comprises fixing-assembly, driven subassembly and three drive units; Two described reciprocal conveying mechanisms are fixedly connected with described fixing-assembly respectively; Drive unit described in one of them is fixedly connected with described fixing-assembly, for driving described driven subassembly along the direction to-and-fro motion perpendicular to two described reciprocal conveying mechanisms;
Described driven subassembly comprises link, adjustment block that flat wedge cam that two shapes are identical is identical with two shapes;
Two described wedge cams are symmetrical arranged, and are rotationally connected with described link respectively, and rotating shaft is positioned at two described wedge cams one end close to each other; The roller of the plate face of two described wedge cam the same sides reciprocal conveying mechanism described with two respectively abuts; The plate face of two described wedge cam opposite sides abuts with two described adjustment blocks respectively;
Two described adjustment blocks are symmetrical arranged, the symmetry axis conllinear of its symmetry axis and two described wedge cams;
Drive unit described in two other and described link affixed, for driving two described adjustment blocks along the direction to-and-fro motion being parallel to described symmetry axis.
2. liquid chromatogram parallel high voltage infusion pump according to claim 1, is characterized in that, three described drive units are motor.
3. liquid chromatogram parallel high voltage infusion pump according to claim 2, is characterized in that, described link comprises flat first joint and the second joint; Two described wedge cams are rotationally connected by rotating shaft and described first joint, and two described rotating shafts are perpendicular to described first joint; Described first joint is vertical affixed with one of them plate face of described second joint; Motor described in one of them and described fixing-assembly affixed, its driveshaft adopts thread screw to be connected with described second joint.
4. liquid chromatogram parallel high voltage infusion pump according to claim 3, it is characterized in that, described liquid chromatogram parallel high voltage infusion pump also comprises driven unit, described driven unit is provided with upper and lower two parallel slide rails, and another plate face of described second joint is provided with the slide block matched with described slide rail; Described slide block and described slide rail are slidably connected.
5. liquid chromatogram parallel high voltage infusion pump according to claim 4, is characterized in that, described in corresponding every bar, slide rail is provided with two slide blocks.
6. liquid chromatogram parallel high voltage infusion pump according to claim 3, is characterized in that, the driveshaft of another two described motors adopts thread screw to be connected with two described adjustment blocks respectively.
7. liquid chromatogram parallel high voltage infusion pump according to claim 2, is characterized in that, described fixing-assembly is provided with vent hole near three described motor places.
8. liquid chromatogram parallel high voltage infusion pump according to claim 1, is characterized in that, the bearing surface of two described adjustment blocks and two described wedge cams is arc surface.
9. liquid chromatogram parallel high voltage infusion pump according to claim 1, is characterized in that, two described wedge cams are rectangular.
10. the liquid chromatogram parallel high voltage infusion pump according to any one of claim 1-9, it is characterized in that, described fixing-assembly comprises fixed base, two described reciprocal conveying mechanisms and described fixed base affixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520517028.2U CN205064208U (en) | 2015-07-16 | 2015-07-16 | Liquid chromatogram high -pressure transfusion pump that connects in parallel |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520517028.2U CN205064208U (en) | 2015-07-16 | 2015-07-16 | Liquid chromatogram high -pressure transfusion pump that connects in parallel |
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| Publication Number | Publication Date |
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| CN205064208U true CN205064208U (en) | 2016-03-02 |
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| CN201520517028.2U Withdrawn - After Issue CN205064208U (en) | 2015-07-16 | 2015-07-16 | Liquid chromatogram high -pressure transfusion pump that connects in parallel |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003411A (en) * | 2015-07-16 | 2015-10-28 | 河北欧世盛科技有限公司 | Liquid chromatogram parallel high-pressure infusion pump |
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2015
- 2015-07-16 CN CN201520517028.2U patent/CN205064208U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003411A (en) * | 2015-07-16 | 2015-10-28 | 河北欧世盛科技有限公司 | Liquid chromatogram parallel high-pressure infusion pump |
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