CN202056032U - Magnetostrictive nano-liter micro flow chromatogram pump - Google Patents
Magnetostrictive nano-liter micro flow chromatogram pump Download PDFInfo
- Publication number
- CN202056032U CN202056032U CN 201120071423 CN201120071423U CN202056032U CN 202056032 U CN202056032 U CN 202056032U CN 201120071423 CN201120071423 CN 201120071423 CN 201120071423 U CN201120071423 U CN 201120071423U CN 202056032 U CN202056032 U CN 202056032U
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- pump head
- plunger rod
- head housing
- pump
- head casing
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Abstract
The utility model discloses a magnetostrictive nano-liter micro flow chromatogram pump, which comprises a pump head casing; an outlet check valve and an inlet check valve are installed one end surface of the pump head casing respectively at an upper and an lower position; two spaced external magnetic field apparatuses are disposed in the pump head casing; a magnetostrictive body is disposed between the two external magnetic field apparatuses; one end face of the magnetostrictive body is contacted with the inner wall of the pump head casing; a plunger rod type dividing film is mounted in the pump head casing on the side near the outlet check valve and the inlet check valve pump head, while is contacted with the magnetostrictive body; a convexity is formed on the inner wall of the pump head casing near the plunger rod type dividing film; a pre-stressed backward spring is disposed between the convexity and the plunger rod type dividing film; and a temperature observing and controlling apparatus is disposed in the pump head casing. The mechanical structure of the utility model has a simple structure, is convenient for control; solves the problems of creeping, resonance and noise in conventional chromatogram pumps; and increases the flow precision of the system.
Description
Technical field
The utility model relates to a kind of micro fluid supply unit, and this FLUID TRANSPORTATION unit is specially adapted to use in the chromatographic system receiving upgrading, mainly is that a kind of magnetostriction is received and risen micrometeor chromatogram pump.
Background technique
Chromatogram (chromatography) technology is a kind of laboratory and industrial production separation and analysis means commonly used, this comes from chromatographic column by the chromatograph packing material mechanism of action different with material to be separated, make material to be separated go out chromatographic column, analyze and the purpose of separating thereby reached according to different retention time sequential flow.
In the prior art, the chromatogram pump is one of important composition parts of high performance liquid chromatograph, chromatogram pump performance stability directly has influence on the stability of analysis, repeatability, and analysis precision, liquid chromatography pump commonly used at present comprises pneumatic amplification pump, reciprocating pump, the spiral syringe pump, diaphragm pumps etc. are several, because pneumatic amplification pump and spiral syringe pump exist Flow-rate adjustment constant, and the solvent replacement difficulty, be unfavorable for shortcomings such as gradient elution, application area is restricted, and mechanical reciprocating pump is with its stable performance, and the application of advantage in the liquid chromatogram instrument such as Flow-rate adjustment and solvent replacement convenience are the most extensively sent out, the machinery reciprocating pump has two kinds of main forms, a kind of reciprocating plunger pump that is referred to as directly drives liquid by plunger rod, and another kind is a reciprocating diaphragm pump, the driving diaphragm of reciprocating plunger machinery does not contact fluid with plunger.
Reciprocating plunger pump commonly used is by driven by motor eccentric wheel or cam rotation, the cam drive reciprocating motion of the pistons, by the one-way valve control flows to, finish an imbibition relief liquor circulation a reciprocal week of cam, the liquid of output designated volume, can adjust piston reciprocating frequence control flow rate by changing motor speed, owing to have the imbibition process in the reciprocating motion of the pistons, therefore causing exporting solution easily exists sine pulse.And adopt double-plunger or multicolumn plug system can reduce the output pulse to a certain extent, common double plunger pump has two kinds of parallel and tandems, the general employing of parallel-connected pumps two or a cam, two in parallel uses of plunger rod, cam differs 180 degree, two cams replace imbibition and discharge opeing, thereby obtain exporting comparatively stably liquid stream.
The producer that has does not now use cam and is to use the to-and-fro motion of linear electric motor leading screw to drive the to-and-fro motion of plunger rod, just uses the reciprocating function of cam driven plunger rod to be substituted by more advanced linear electric motor.But the core of these pumps all is to use stepping or circular movement that actuating motor produces, and drives the plunger rod motion by different mechanical drive modes, and core is the difference of mechanical drive mode.
Along with the high performance liquid chromatography development trend towards high pressure, the direction of low discharge develops, power supply pattern moving body under the low discharge pattern that tradition uses stepper motor to drive cam or leading screw has revealed inevitable drawback, this is because reducing along with flow, require the angular velocity rotating speed of stepper motor more and more lower, and for the stationarity that guarantees to infuse, then require the segmentation angle of stepper motor more and more littler, just stepper motor is operated in the low speed jerking motion state, occur easily losing the step, resonance, shortcomings such as noise, more seriously the precession of stepper motor is discontinuous (depending on the segmentation step number), so cause the infusion pressure shakiness, this phenomenon is not obvious when milliliter and micro updating are used, but particularly outstanding when receiving upgrade application, and this is to make all will have pause could guarantee to receive between the segmentation of stepper motor minimum to upgrade other flow to export owing to receive the traffic requirement that rises.
Bring the basic reason of above problems to be that used power unit is traditional motor.Therefore utilize the mechanical dimension of magnetostriction materials to change with the change of externally-applied magnetic field, and extending amount is fit to receive plunger (diaphragm) stroke dimension that rises the chromatogram pump, so adopt magnetostriction materials to provide the source as the power of FLUID TRANSPORTATION unit, to have mechanical structure simple with in the past chromatogram pump, only need on the magnetostriction direction and plunger rod-type diaphragm close-coupled, do not need mechanical transmissions such as cam and leading screw, eliminated " idle running " the phenomenon on the mechanical transmission simultaneously.By regulating the power of externally-applied magnetic field, cooperate the prestressing force retracting spring to reach the to-and-fro motion of plunger rod, eliminated the stepper motor low speed jerking motion, resonance, the shortcoming of noise, utilize magnetic intensity can transfer continuously to control the adjustable continuously of magnetostriction length, eliminated the shortcomings such as hydrodynamic pressure fluctuation that the stepper motor stepping brought.Simultaneously can also introduce temperature compensation means, and then eliminate the magnetostriction that temperature caused and received and rise the inaccurate shortcoming of micrometeor chromatogram pump duty.
The stress that magnetostriction materials have generation is big, energy density is high, but instant response, and have reliability height, Curie temperature advantages of higher, have remarkable electromagnetic energy and mechanical energy or acoustic energy conversion performance.Tb-Dy-Fe alloy for example, the strain value that its produces under downfield drives is up to 1500-2000ppm.Magnetostrictive size is a magnetostriction coefficient with stretching relatively usually
Characterize, be defined as
, in the formula
The magnetostriction amount of expression material,
Length for material. when increasing externally-applied magnetic field, if
, be called the positive magnetostriction material,
Otherwise, if
, then be called the negative magnetostriction material,
When externally-applied magnetic field reached capacity magnetizing field, the magnetostriction of material the general do not change with the variation of externally-applied magnetic field, is a particular value, represents with λ, is called the saturation magnetostriction coefficient of magnetic material.
The model utility content
Technical problem to be solved in the utility model provides a kind of magnetostriction and receives and rise micrometeor chromatogram pump, it is by the mechanical-stretching characteristic of magnetostriction materials under externally-applied magnetic field, utilize magnetic field to control moving of pump head center pillar stopper rod formula diaphragm, cooperate turnover one-way valve switch, reach the purpose that Micro-volume liquid is carried, it is simple to have mechanical mechanism, flow is controlled easily, avoided in the traditional liquid supply unit owing to creeping that the motor low cruise produces, resonance, noise, shortcoming such as flow is wayward, system adopts diaphragm type structure, avoid the plunger pump trace to reveal shortcoming, also used prestressed structure, and the measurement and control of temperature setting, solve the flow drifting problem that magnetostriction materials do not have prestressing force output power little shortcoming and cause because of temperature drift, improved the flow precision of system.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
A kind of magnetostriction is received and is risen micrometeor chromatogram pump, includes the pump head housing, and the upper and lower position of described pump head housing one side end face is separately installed with outlet one-way valve and import one-way valve; Be provided with two externally-applied magnetic field devices separately in the described pump head housing, between the two externally-applied magnetic field devices magnetostrictor arranged, an end face of magnetostrictor contacts with the inwall of pump head housing; Side near outlet one-way valve and import one-way valve in the described pump head housing also is equipped with plunger rod-type barrier film, and described plunger rod-type barrier film contacts with magnetostrictor; The inwall of described pump head housing has projection near the position of plunger rod-type barrier film, is provided with the prestressing force retracting spring between projection and plunger rod-type barrier film; Be provided with temperature measurement and control instrument in the described pump head housing.
Described plunger rod-type barrier film closely is connected with the pump head housing by the pump head connecting bolt.
Provide the power resources of plunger rod-type diaphragm motion (to produce) in magnetic field in magnetostriction materials that with the mechanical dimension that magnetic intensity changes, magnetostriction materials length is 10-30cm, diameter 1-5cm in the utility model by the externally-applied magnetic field device; Adopt plunger rod-type diaphragm, solved plunger rod and had the shortcoming of micro-seepage, and adopted the structure of film and plunger rod one, can solve the problem of membrane pump backhaul difficulty; Introduce temperature measurement and control instrument, can reduce caused pump duty variation, improved the output flow precision of system because system temperature drifts about; Use the prestressing force retracting spring, the backhaul that spring can play simultaneously to magnetostriction materials prestressing force, diaphragm provides thrust.
Magnetostrictor adopts the TbDyFe alloy bar material in the utility model, reaches the Tb-Dy-Fe alloy material as magnetostriction materials, and Tb-Dy-Fe alloy material energy density is big, ouput force is big, deformational displacement is big, and its magnetostrictivity is up to 2000ppm, and the deformational displacement corresponding speed is fast, be generally less than 1ms, and stable output is arranged in the 1000Hz scope, and in the native system user mode, frequency of okperation is generally less than 50Hz, near TbDyFe alloy bar material static characteristic, and operating temperature is no more than 120 degrees centigrade.
The utility model maximum working voltage is 50V, electric current 2A, and design output displacement is 0.1mm, the pressure of output is 130KN.The length of choosing according to the actual conditions magnetostrictor is between 10-20cm, diameter can be controlled between the 1cm-3cm according to the pressure of output, in order to reach high output pressure, what the diameter of plunger rod-type diaphragm and magnetostrictor compared can regulate, but basic mechanical structure remains unchanged.
Working principle of the present utility model is: the externally-applied magnetic field device makes the axial mechanical dimension telescopic variation of magnetostrictor, thereby promoting plunger rod-type diaphragm travels forward, import closed check valve at this time, the outlet one-way valve is open, thereby liquid flows out from the outlet one-way valve, when externally-applied magnetic field reduces, the mechanical dimension of magnetostrictor diminishes, at this moment plunger rod-type diaphragm is because the thrust of prestressing force retracting spring, to follow magnetostrictor and do drawback movement, at this moment, the import one-way valve is open, export closed check valve, finish the process of imbibition.Move repeatedly thus, finished the suction liquid function of chromatogram pump.
The utility model has the advantages that:
The utility model mechanical structure is simple, is convenient to control, and does not have and creep, resonance, the shortcoming of traditional chromatogram pump such as noise; Improved the flow precision of system.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Embodiment
Referring to Fig. 1, a kind of magnetostriction is received and is risen micrometeor chromatogram pump, includes pump head housing 7, and the upper and lower position of described pump head housing 7 one side end faces is separately installed with outlet one-way valve 5 and import one-way valve 1; Being provided with in the described pump head housing 7 between two externally-applied magnetic field devices, 9, the two externally-applied magnetic field devices 9 separately has magnetostrictor 10, and an end face of magnetostrictor 10 contacts with the inwall of pump head housing 7; Side near outlet one-way valve and import one-way valve in the described pump head housing 7 also is equipped with plunger rod-type barrier film 4, and described plunger rod-type barrier film 4 contacts with magnetostrictor 10; The inwall of described pump head housing 7 has projection 8 near the position of plunger rod-type barrier film, is provided with prestressing force retracting spring 2 between projection 8 and plunger rod-type barrier film 4; Be provided with temperature measurement and control instrument 3 in the described pump head housing 7.Described plunger rod-type barrier film 4 closely is connected with pump head housing 7 by pump head connecting bolt 6.
Externally-applied magnetic field device 9 produces the electromagnetic field that can change, thereby the axial mechanical dimension that makes magnetostrictor 10 changes with the power of externally-applied magnetic field, thereby promoting plunger rod-type diaphragm 4 travels forward, at this moment import one-way valve 1 is closed, outlet one-way valve 5 is open, thereby liquid flows out from outlet one-way valve 5, when externally-applied magnetic field reduces, the mechanical dimension of magnetostrictor 10 diminishes, and at this moment plunger rod-type diaphragm 4 will be followed magnetostrictor and do drawback movement owing to the thrust of prestressing force retracting spring 2, at this moment, import one-way valve 1 is open, and outlet one-way valve 5 is closed, and finishes the process of imbibition.Move repeatedly thus, finished the suction liquid function of chromatogram pump.
Claims (2)
1. a magnetostriction is received and risen micrometeor chromatogram pump, includes the pump head housing, it is characterized in that: the upper and lower position of described pump head housing one side end face is separately installed with outlet one-way valve and import one-way valve; Be provided with two externally-applied magnetic field devices separately in the described pump head housing, between the two externally-applied magnetic field devices magnetostrictor arranged, an end face of magnetostrictor contacts with the inwall of pump head housing; Side near outlet one-way valve and import one-way valve in the described pump head housing also is equipped with plunger rod-type barrier film, and described plunger rod-type barrier film contacts with magnetostrictor; The inwall of described pump head housing has projection near the position of plunger rod-type barrier film, is provided with the prestressing force retracting spring between projection and plunger rod-type barrier film; Be provided with temperature measurement and control instrument in the described pump head housing.
2. a kind of magnetostriction according to claim 1 is received and risen micrometeor chromatogram pump, it is characterized in that: described plunger rod-type barrier film closely is connected with the pump head housing by the pump head connecting bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120071423 CN202056032U (en) | 2011-03-18 | 2011-03-18 | Magnetostrictive nano-liter micro flow chromatogram pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120071423 CN202056032U (en) | 2011-03-18 | 2011-03-18 | Magnetostrictive nano-liter micro flow chromatogram pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202056032U true CN202056032U (en) | 2011-11-30 |
Family
ID=45016003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120071423 Expired - Lifetime CN202056032U (en) | 2011-03-18 | 2011-03-18 | Magnetostrictive nano-liter micro flow chromatogram pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202056032U (en) |
-
2011
- 2011-03-18 CN CN 201120071423 patent/CN202056032U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20111130 |