CN105065223A - High-pressure plunger infusion pump and aligning method thereof - Google Patents
High-pressure plunger infusion pump and aligning method thereof Download PDFInfo
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- CN105065223A CN105065223A CN201510473875.8A CN201510473875A CN105065223A CN 105065223 A CN105065223 A CN 105065223A CN 201510473875 A CN201510473875 A CN 201510473875A CN 105065223 A CN105065223 A CN 105065223A
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Abstract
The invention relates to an infusion pump, particularly to a high-pressure plunger infusion pump and an aligning method thereof. The high-pressure plunger infusion pump comprises a pump head component, a base and a pump body base, wherein a plunger hole is formed in the pump head component and is connected with an inlet one-way valve and an outlet one-way valve; a plunger rod is movably arranged in the plunger hole; a high-pressure seal ring and a low-pressure seal ring are concentrically mounted on the plunger rod in a sleeving manner; a convex surface or concave surface is arranged at the tail end of the plunger rod; a push rod is arranged in a push rod hole of the pump body base; the top end of the push rod has a concave surface or convex surface; the convex surface and the concave surface are in contact connection to transmit power; the plunger rod is elastically arranged in the plunger hole and is in elastic connection with the push rod; the push rod, the plunger rod, the high-pressure seal ring and the low-pressure seal ring are coaxially arranged. During the assembling and moving processes of the high-pressure plunger infusion pump, accumulated errors caused by processing and assembling of parts are eliminated, the overall service life of a liquid chromatograph is prolonged, the infusion accuracy of a system is greatly improved, and the analytical accuracy of the liquid chromatograph is ensured.
Description
Technical field:
The present invention relates to a kind of infusion pump, this infusion pump is used for the high-pressure flow phase of conveying liquid chromatography, is a kind of by plunger rod to-and-fro motion and reach high-pressure plunger infusion pump and the aligning method thereof of high-voltage-stable transfusion in pump chamber.
Background technique:
At present high-pressure plunger pump traditional on the market mostly adopts following structure (as shown in Figure 1): comprise pump head, plunger and three modular construction such as drive mechanism, cam thereof.Pump head comprises the structures such as transfusing chamber 1, cleaning chamber 2, import one-way valve 3, Outlet check valves 4, high-pressure seal ring 5, low pressure seal circle 6.When single-column stopper rod 7 moves backward, Outlet check valves 4 is closed, mobile phase enters into transfusing chamber 1 from import one-way valve 3 and fills up the seal space of pump chamber and high-pressure seal ring 5 composition, when plunger rod 7 moves forward, import one-way valve 3 is closed, Outlet check valves 4 is opened, and liquid to be flow into system by Outlet check valves 4 from pump chamber and goes.Motor, by connecting cam, realizes changing circular movement into straight line motion.Power is delivered to plunger rod 7 by push rod by cam, realizes high pressure steadily infuse by plunger rod 7 along the to-and-fro motion of transfusing chamber wall.
In existing plunger pump structure, the benchmark of whole system is all pump seat usually, but be all indirection reference, namely seal ring is fixed on pump head, and pump head is fixed on the pump housing, plunger rod 7 is fixed on push rod, push rod is fixed on bearing, and bearing is fixed on the pump housing, therefore as two parts of directly contact, because the tolerance relating to multiple part adds up, seal ring 5,6 and plunger rod 7 cannot well ensure concentricity and perpendicularity.
The system pressure of the requirement of usual liquid chromatograph reaches 40MPa, flow accuracy reaches 0.1%RSD, require plunger rod 7 and seal ring 5, 6 have very high concentricity and perpendicularity, plunger rod 7 is fixed on push rod 8, push rod 8 is fixed on pump seat 9 simultaneously, pump head is fixed on pump seat 9, high-pressure seal ring 5 is fixed on pump head, multiple part lacks unified reference level, the tolerance of processing and assembling all will be accumulated to plunger rod 7 and seal ring 5, between 6, exacerbate seal ring 5, the wearing and tearing of 6, greatly have impact on seal ring 5, the life-span of 6, seal ring 5, the fine particle of 6 wearing and tearing will pollute chromatographic system further, have impact on precision of analysis and the working life reducing instrument.
Summary of the invention:
The object of this invention is to provide a kind of accumulative high-pressure plunger infusion pump and the aligning method thereof that correct piston structure containing automated location, eliminate processing and build-up tolerance.
The present invention is achieved in that
A kind of high-pressure plunger infusion pump, include pump head parts, base, pump housing pedestal, plunger hole is provided with in described pump head parts, plunger hole connects import one-way valve, Outlet check valves, plunger rod is movably arranged in plunger hole, on plunger rod, concentric locking collar is equipped with high-pressure seal ring and low pressure seal circle respectively, the tail end of described plunger rod is provided with convex surface or concave surface, push rod is arranged in the push-rod hole of pump housing pedestal, the top of push rod is concave surface or convex surface, convex surface contacts with concave surface and connects transferring power, plunger rod elasticity is arranged in plunger hole, plunger rod is connected with push rod elasticity, push rod, plunger rod, high-pressure seal ring and low pressure seal circle are coaxially set.
In technique scheme, described convex surface is the sphere of ball, and the top of push rod or the tail end of plunger rod are provided with blind hole, be provided with in blind hole can be freely movable in blind hole ball, the degree of depth of the diameter > blind hole of described ball;
Or described convex surface is cylindrical cylndrical surface, the top of push rod or the tail end of plunger rod are provided with the axis cylindrical body mounting hole vertical with push rod, cylindrical body is arranged in cylindrical body mounting hole, and the degree of depth of cylindrical diameter > mounting hole, cylindrical body is Free-rolling in mounting hole.
In technique scheme, the tail end of described plunger rod is inlaid with the terminal of outer end with concave surface, and the concave surface of terminal is connected with the convex surface point cantact of push rod or linear contact lay; Or the top of push rod is inlaid with the terminal of outer end with concave surface, the concave surface of terminal is connected with the convex surface point cantact of plunger rod or linear contact lay.
In technique scheme, described terminal stupalith is made, and the concave surface of described terminal is spherical concave surface, and the radius of the concave surface of terminal is more than 1.5 times of crown radius;
Or the concave surface of described terminal is arc-shaped concave.
In technique scheme, the tail end of described plunger rod or the top of push rod are provided with mounting hole, and terminal is connected with mounting hole close-fitting.
In technique scheme, described plunger rod elasticity is arranged in plunger hole and is: be set with pad at the tail end of plunger rod, and one end of spring holds out against on pad, the other end holds out against on the step surface of plunger hole;
Or be set with pad at the tail end of plunger rod, front portion is set with spring seat, one end of spring holds out against on pad, the other end holds out against on spring seat, and spring seat to hold out against in plunger hole on corresponding step surface.
A kind of self-aligning method of high pressure pump, comprise Xu Ye mechanism, stretch into store the in-house plunger rod of liquid by power plant drive push rod and Spring driving its move back and forth, described Xu Ye mechanism comprises transfusing chamber and cleaning chamber, the liquid entering hole that described transfusing chamber connects and liquid outlet are respectively arranged with the import one-way valve and Outlet check valves that are stressed and control, and the side, front and back of cleaning chamber is nested with high and low pressure seal ring; Described high and low pressure seal ring all keeps concentric with reciprocating plunger rod, and the to-and-fro motion of plunger rod is formed between high and low pressure seal ring and store in liquid air chamber the pressure had needed for drip washing described in maintenance in the suction and output procedure of fluid; The concave surface that described push rod is arranged or convex surface pass through to contact the self-aligning connecting and coordinate and realize push rod and plunger rod with the convex surface that plunger rod is arranged or concave surface.
In technique scheme, by convex surface and concave surface slip station-keeping mode between described push rod and plunger rod.
In technique scheme, the tail end of described plunger rod is provided with concave surface minimum point, and this is connected automatically with the convex surface peak of push rod, and by this transmission;
Or the top of described push rod is provided with concave surface minimum point, this is connected automatically with the convex surface peak of plunger rod, and by this transmission.
The advantage that the present invention gives prominence to compared to existing technology is:
1, the present invention is by self-correcting piston structure, can in assembly process and movement process, elimination parts machining and assembling cause integrating error, greatly can extend the life-span of plunger pump attrition component seal ring, thus extend the bulk life time of liquid chromatograph, simultaneously owing to decreasing the leakage scenarios of pressure mobile phase, can the transfusion precision of greatly elevator system, ensure that the accuracy that liquid chromatograph is analyzed;
2, the present invention is in the to-and-fro motion of plunger rod, because the top of plunger rod tail end and push rod is the contact put with point or line and line, under the effect of spring pressure, can elimination of level substantially horizontal, Vertical direction and other directions multi-C stereo stressed, can guarantee that plunger rod is in movement process, all the time keep plumbness with seal ring, allow seal ring and plunger rod remain at the state of fitting tightly, reduce the micro-leakage scenarios of high-pressure flow phase.
Accompanying drawing illustrates:
Fig. 1 is the schematic diagram of background technique;
Fig. 2 is generalized section of the present invention;
Fig. 3 is the enlarged diagram of Fig. 2.
Embodiment:
With specific embodiment, the invention will be further described below, see Fig. 2-3:
A kind of high-pressure plunger infusion pump, include pump head parts 10, base 20, pump housing pedestal 30, plunger hole is provided with in described pump head parts 10, the head of plunger hole is transfusing chamber 101, high-pressure seal ring 60 is provided with in transfusing chamber, in plunger hole, be also provided with low pressure seal circle 50, form cleaning chamber 102 in the plunger hole between high-pressure seal ring 60 and low pressure seal circle 50, namely leacheate stores liquid air chamber.Transfusing chamber 101 is connected with import one-way valve 103 and Outlet check valves 104, high-pressure seal ring 60, low pressure seal circle 50 is sleeved on outside plunger rod 40, plunger rod 40 is movably arranged in plunger hole, plunger rod 40 can move back and forth in plunger hole along its axis, high-pressure seal ring 60 and low pressure seal circle 50 are coaxially set, the tail end of described plunger rod 40 is provided with concave surface, push rod 70 is arranged in the push-rod hole 301 of pump housing pedestal 30, the top of push rod 70 is convex surface, convex surface contacts transferring power with concave surface, plunger rod 40 elasticity is arranged in plunger hole, plunger rod 40 is connected with push rod 70 elasticity, push rod 70, plunger rod 40, high-pressure seal ring 60 and low pressure seal circle 50 are coaxially set.
In technique scheme, described convex surface is the sphere of ball 80, the top of described push rod 70 or the tail end of plunger rod 40 are provided with blind hole, ball 80 is provided with in blind hole, the degree of depth of the diameter > blind hole of described ball 80, described ball 80 is freely movable in blind hole.
Convex surface can also be cylindrical cylndrical surface, the top of push rod 70 or the tail end of plunger rod 40 are provided with the axis cylindrical body mounting hole vertical with push rod 70, cylindrical body is arranged in cylindrical body mounting hole, and the degree of depth of cylindrical diameter > mounting hole, cylindrical body is Free-rolling in mounting hole.
In technique scheme, the tail end of described plunger rod 40 is provided with the terminal 90 of outer end with concave surface 901, and the concave surface 901 of terminal 90 is connected with the convex surface point cantact of push rod 70;
Or the top of push rod 70 is inlaid with the terminal of outer end with concave surface, the concave surface of terminal is connected with the convex surface point cantact of plunger rod 40 or linear contact lay.
In technique scheme, the material of described terminal 90 is pottery.The concave surface of described terminal 90 is spherical concave surface 901, and the radius of spherical concave surface 901 is R, and the radius of ball 80 is that r, R are much larger than r.The radius of the concave surface of terminal 90 is more than 1.5 times of crown radius.
The concave surface of terminal 90 also can be arc-shaped concave, and the radius of arc-shaped concave is much larger than cylindrical radius.
In technique scheme, described plunger rod 40 is provided with mounting hole, terminal 90 be connected with mounting hole close-fitting or terminal 90 be provided with the glue be connected between mounting hole.
In technique scheme, described plunger rod 40 elasticity is arranged in plunger hole and is: be set with pad 100 at the tail end of plunger rod 40, and one end of spring 110 holds out against on pad 100, the other end holds out against on the step surface of base 20;
Or pad 100 and spring seat is set with outside the tail end of plunger rod 40, one end of spring 110 holds out against on pad 100, the other end holds out against on spring seat, and spring seat holds out against on the step surface of base 20.
The top of traditional plunger rod 40 is connected with high pressure, low pressure seal circle 60,50, and tail end is connected with push rod 70.In the present invention, be separated by the tail end of plunger rod 40 with push rod 70, inlay a ceramic terminal 90 at the tail end of plunger rod 40, the surface design of ceramic terminal 90 has an internal diameter to be the spherical concave surface 901 of R.Design on push rod 70 top (be connected with plunger rod 40 this one end) internal diameter be r ball 80, two parts by spring pressure system make it connect.
In course of working, the precision of single part often can reasonablely control.Therefore, the accumulated tolerance, particularly moving element that only need eliminate each part are accumulated tolerance, and in this example, plunger rod 40 is moving elements, therefore need the accumulated tolerance eliminating plunger rod 40 to coordinate the accumulated tolerance eliminating seal ring 50,60 again.
In assembly process, first plunger rod 40 and high pressure, low pressure seal circle 60,50 are assembled into one, after push rod 70 has assembled, again plunger rod 40 is pushed to the requirement on push rod 70 top, because R is greater than r greatly, therefore auto-alignment is fallen the minimum point (plunger rod 40 is removable) of plunger rod 40 upper terminal 90 concave surface 901 by the peak of push rod 70 top ball 80, achieves self-alignment function.Simultaneously, due to point and point cantact, also will realize three-dimensional position to correct, eliminate accumulated tolerance and the assembly error of each part, guarantee plunger rod 40 and high-pressure seal ring 60, the concentricity of low pressure seal circle 50 and perpendicularity, like this in assembly process, the pump housing of original integrative-structure is divided into pump head, spring pressure system, plunger rod 40 and pump housing pedestal 30 3 modules to assemble respectively, finally assemble, reduce part processing precision, assembly cost, provide reliability and the accuracy of system.
In the to-and-fro motion of plunger rod 40, because plunger rod 40 tail end and push rod 70 top are that point is stressed with point cantact, under the effect of spring pressure system, can elimination of level substantially horizontal, Vertical direction and other directions multi-C stereo stressed, can guarantee that plunger rod 40 is in movement process, all the time keep plumbness with high pressure, low pressure seal circle 60,50, allow seal ring 50,60 and plunger rod 40 remain at the state of fitting tightly, reduce the micro-leakage scenarios of high-pressure flow phase.
The self-aligning method of high-pressure plunger infusion pump, comprise Xu Ye mechanism, stretch into and store push rod that the in-house plunger rod of liquid 40 drives by power plant and spring 110 drives it to move back and forth, described Xu Ye mechanism comprises transfusing chamber 101 and cleaning chamber 102, the liquid entering hole that described transfusing chamber 101 connects and liquid outlet are respectively arranged with the import one-way valve 103 and Outlet check valves 104 that are stressed and control, and the side, front and back of cleaning chamber 102 is nested with high and low pressure seal ring 60,50; Described high and low pressure seal ring 60,50 all keeps concentric with reciprocating plunger rod 40, and the to-and-fro motion of plunger rod 40 is formed between high and low pressure seal ring 60,50 and store in liquid air chamber the pressure had needed for drip washing described in maintenance in the suction and output procedure of fluid; The concave surface that described push rod 70 is arranged or convex surface pass through to contact the self-aligning connecting and coordinate and realize push rod 70 and plunger rod 40 with the convex surface that plunger rod 40 is arranged or concave surface.
In technique scheme, by convex surface and concave surface slip station-keeping mode between described push rod 70 and plunger rod 40.
In technique scheme, the tail end of described plunger rod 40 has cambered surface minimum point, and this is connected automatically with the cambered surface peak of push rod 70, and by this transmission;
Or the top of described push rod 70 is provided with concave surface minimum point, this is connected automatically with the convex surface peak of plunger rod 40, and by this transmission.
Above-described embodiment is only one of preferred embodiment of the present invention, not limits practical range of the present invention with this, therefore: all equivalence changes done according to shape of the present invention, structure, principle, all should be covered by within protection scope of the present invention.
Claims (9)
1. a high-pressure plunger infusion pump, include pump head parts, base, pump housing pedestal, plunger hole is provided with in described pump head parts, plunger hole connects import one-way valve, Outlet check valves, plunger rod is movably arranged in plunger hole, on plunger rod, concentric locking collar is equipped with high-pressure seal ring and low pressure seal circle respectively, it is characterized in that: the tail end of described plunger rod is provided with convex surface or concave surface, push rod is arranged in the push-rod hole of pump housing pedestal, the top of push rod is concave surface or convex surface, convex surface contacts with concave surface and connects transferring power, plunger rod elasticity is arranged in plunger hole, plunger rod is connected with push rod elasticity, push rod, plunger rod, high-pressure seal ring and low pressure seal circle are coaxially set.
2. a kind of high-pressure plunger infusion pump according to claim 1, it is characterized in that: described convex surface is the sphere of ball, the top of push rod or the tail end of plunger rod are provided with blind hole, be provided with in blind hole can be freely movable in blind hole ball, the degree of depth of the diameter > blind hole of described ball;
Or described convex surface is cylindrical cylndrical surface, the top of push rod or the tail end of plunger rod are provided with the axis cylindrical body mounting hole vertical with push rod, cylindrical body is arranged in cylindrical body mounting hole, and the degree of depth of cylindrical diameter > mounting hole, cylindrical body is Free-rolling in mounting hole.
3. a kind of high-pressure plunger infusion pump according to claim 1, is characterized in that: the tail end of described plunger rod is inlaid with the terminal of outer end with concave surface, and the concave surface of terminal is connected with the convex surface point cantact of push rod or linear contact lay; Or the top of push rod is inlaid with the terminal of outer end with concave surface, the concave surface of terminal is connected with the convex surface point cantact of plunger rod or linear contact lay.
4. a kind of high-pressure plunger infusion pump according to claim 3, it is characterized in that: described terminal stupalith is made, the concave surface of described terminal is spherical concave surface, the radius of the concave surface of terminal is more than 1.5 times of crown radius;
Or the concave surface of described terminal is arc-shaped concave.
5. a kind of high-pressure plunger infusion pump according to claim 3, is characterized in that: the tail end of described plunger rod or the top of push rod are provided with mounting hole, and terminal is connected with mounting hole close-fitting.
6. a kind of high-pressure plunger infusion pump according to claim 1, it is characterized in that: described plunger rod elasticity is arranged in plunger hole and is: be set with pad at the tail end of plunger rod, one end of spring holds out against on pad, the other end holds out against on the step surface of plunger hole;
Or be set with pad at the tail end of plunger rod, front portion is set with spring seat, one end of spring holds out against on pad, the other end holds out against on spring seat, and spring seat to hold out against in plunger hole on corresponding step surface.
7. the self-aligning method of a high pressure pump, it is characterized in that: comprise Xu Ye mechanism, stretch into store the in-house plunger rod of liquid by power plant drive push rod and Spring driving its move back and forth, described Xu Ye mechanism comprises transfusing chamber and cleaning chamber, the liquid entering hole that described transfusing chamber connects and liquid outlet are respectively arranged with the import one-way valve and Outlet check valves that are stressed and control, and the side, front and back of cleaning chamber is nested with high and low pressure seal ring; Described high and low pressure seal ring all keeps concentric with reciprocating plunger rod, and the to-and-fro motion of plunger rod is formed between high and low pressure seal ring and store in liquid air chamber the pressure had needed for drip washing described in maintenance in the suction and output procedure of fluid; The concave surface that described push rod is arranged or convex surface pass through to contact the self-aligning connecting and coordinate and realize push rod and plunger rod with the convex surface that plunger rod is arranged or concave surface.
8. the self-aligning method of a kind of high pressure pump according to claim 7, is characterized in that: by convex surface and concave surface slip station-keeping mode between described push rod and plunger rod.
9. the self-aligning method of described a kind of high pressure pump according to claim 7, it is characterized in that: the tail end of described plunger rod is provided with concave surface minimum point, this is connected automatically with the convex surface peak of push rod, and by this transmission;
Or the top of described push rod is provided with concave surface minimum point, this is connected automatically with the convex surface peak of plunger rod, and by this transmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473875.8A CN105065223A (en) | 2015-08-05 | 2015-08-05 | High-pressure plunger infusion pump and aligning method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510473875.8A CN105065223A (en) | 2015-08-05 | 2015-08-05 | High-pressure plunger infusion pump and aligning method thereof |
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| CN105065223A true CN105065223A (en) | 2015-11-18 |
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| CN201510473875.8A Pending CN105065223A (en) | 2015-08-05 | 2015-08-05 | High-pressure plunger infusion pump and aligning method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106404272A (en) * | 2016-11-21 | 2017-02-15 | 浙江福立分析仪器股份有限公司 | High-pressure infusion pump pressure buffer sensor and pressure buffer method |
| CN114607578A (en) * | 2022-04-06 | 2022-06-10 | 苏州博睿嘉晟医疗科技有限公司 | Novel directly drive high pressure constant flow pump |
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| CN114607578A (en) * | 2022-04-06 | 2022-06-10 | 苏州博睿嘉晟医疗科技有限公司 | Novel directly drive high pressure constant flow pump |
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Application publication date: 20151118 |