CN104405613A - Laser-induced micro pump - Google Patents
Laser-induced micro pump Download PDFInfo
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- CN104405613A CN104405613A CN201410700301.5A CN201410700301A CN104405613A CN 104405613 A CN104405613 A CN 104405613A CN 201410700301 A CN201410700301 A CN 201410700301A CN 104405613 A CN104405613 A CN 104405613A
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Abstract
The invention discloses a laser-induced micro pump. The laser-induced micro pump comprises a pump body, a flow outlet, a fluid replenishment chamber and an optical fiber monomer or an optical fiber bundle; a pump chamber is formed in the pump body; the flow outlet is formed at the front end of the pump chamber; the fluid replenishment chamber is communicated with the rear end of the pump chamber; the optical fiber monomer or the optical fiber bundle is inserted into the pump chamber and extends to the front end portion of the pump chamber. According to the laser-induced micro pump, the laser is focused on a liquid medium in a micro flow channel to produce cavitation bubbles by a laser-induced cavitation micro pump technology, the fluid is driven by the fluid movement velocity and propulsive force the growth and collapse of the cavitation bubbles to flow to enable the fluid to comprise the kinetic energy so as to overcome the adhesion force and the pipe resistance of the flow outlet to extrude the fluid in the pump chamber to push the fluid out of the flow outlet, and accordingly the collapse space of the cavitation bubbles retracts, the fluid replenishment chamber is pushed by the balance pressure to replenish the fluid for the pump chamber, the pump suction process of the fluid in the pump chamber is implemented, the effect similar to the micro pump is formed through the laser multi-pulse continuous effect further, and accordingly the trace velocity of the fluid can be driven by the simple laser-induced micro pump to be continuously output in a controllable mode.
Description
Technical field
The present invention relates to a kind of Micropump, particularly relate to a kind of induced with laser Micropump.
Background technique
Microflow control technique refers to that in having at least one dimension to be micron even the low-dimensional channel design of nanoscale, to control volume is that skin rises to and receives the fluid risen and carry out flowing and the technology of mass transfer, heat transfer, belongs to the technical field of numerous subject crossing such as engineering, physics, chemistry, biochemistry, nanometer technology, biotechnology.Micro-fluidic chip, as the carrier of microflow control technique, is generally the chemistry or biology laboratory that build on the chip of a piece several square centimeters.In the functional unit needed for microfluidic system, Micropump is the device adopting different driving mode to form global orientation flowing in the location of micro passage, and therefore micro pump technology is a kind of key technology driving micro-fluid movement in micro channel.
In microfluidic system, need the driving being realized fluid by pump, by valve controls fluid, thus complete flow-control operation, this make micro fluid dynamcis and control operation unit very important.But under microsystem condition, capillary impact becomes fairly obvious, from engineering significance, often effect is bad or even infeasible in microchannel for the method for driving of the fluid volume flowing of conventional macroscopic.Method at present for micro fluid dynamcis mainly contains two kinds: (1) mechanical micropump technology, is be by the flowing kinetic energy of driving fluid changes mechanical energy.(2) based on the on-mechanical micropump technology of electricity, light, magnetic etc., other form of energy (electricity, light, magnetic, heat etc.) is transformed or be applied to by driving fluid, makes it that there is motion energy.Machinery micropump technology and the on-mechanical micro pump technology based on electricity, light, magnetic etc., to a certain extent with in specific application area, effectively can drive microfluid directional flow in micro channel, thus facilitate the development of microflow control technique.
At present, mechanical micropump generally comprises the component of large amount of complex, and these component require to possess highi degree of accuracy, and processing exists larger difficulty, and the manufacture cost of pump is high; Meanwhile, the assembling of mechanical micropump component and integratedly also there is very large difference with traditional macroscopical mounting technology, under micro-scale, the effect of the gravity equal-volume power of component is more and more weak, and the surface tension such as adhesive force then play conclusive effect.Therefore, the bottleneck that mechanical micropump parts machining and integrated technology exist constrains its development to a certain extent.And based on the on-mechanical micropump technology of electricity, light, magnetic etc., although there is not processing and the integration problem of mechanical micropump component, but because it relates to electricity, light, magnetic, the conversion of hot homenergic, can only be operated in certain is specific application area, there is significant limitation, limit it and further develop.
Summary of the invention
Not enough for prior art, the technical problem to be solved in the present invention be to provide a kind of can the induced with laser Micropump that controllably exports continuously of driving fluid trace flow velocity.
In order to overcome prior art deficiency, the technical solution used in the present invention is: a kind of induced with laser Micropump, it comprise inside be provided with pump chamber the pump housing, be located at going out head piece, the fluid infusion chamber be communicated with described pump chamber rear end, inserting described pump chamber and extend to optical fiber monomer or the fiber bundle of pump chamber front end of described pump chamber front end, the rear end of described optical fiber monomer or fiber bundle is connected with laser.
One as the technological scheme of induced with laser Micropump of the present invention is improved, the described pump housing is provided with the end plug relative with going out head piece, the through hole that described end plug plug is offered in described pump housing rear end, described end plug has confession optical fiber monomer or fiber bundle passes and forms the perforation of fluid-tight.
One as the technological scheme of induced with laser Micropump of the present invention is improved, the front end of described optical fiber monomer or fiber bundle towards described go out head piece.
One as the technological scheme of induced with laser Micropump of the present invention is improved, and described fluid infusion chamber and described pump chamber are mutually vertical or be connected to form acute angle.
The invention has the beneficial effects as follows: by induced with laser cavitation micro pump technology, Laser Focusing liquid medium in micro channel is utilized to produce cavitation bubble, utilize the fluid-propelled speed and the flowing of propelling force driving fluid that produce in cavitation bubble growth and collapse process, cavitation bubble expansion extrusion fluid, the fluid that internal pressure is balanced has kinetic energy, overcome adhesive force and the pipe resistance going out head piece, the fluid compression in pump chamber is released from going out head piece.Then cavitation bubble is crumbled and fall space contraction, and under the promotion of balance pressure, fluid infusion chamber is pump chamber fluid replacement, achieves the pump of fluid in pump chamber and is drawn through journey.The effect of similar Micropump is formed further by laser multiple pulse continuous action, thus simple laser Micropump device driving fluid trace flow velocity can be used controllably to export continuously, this Micropump has the Millisecond reaction time and does not have complicated moving parts, microorganism medical science, MEMS, micro channel can be widely used in, even the field such as ink-jet printer.
Accompanying drawing explanation
Fig. 1 is the cross-sectional view of the embodiment of induced with laser Micropump of the present invention.
Embodiment
Below embodiments of the present invention are specifically described.
As shown in Figure 1, a kind of induced with laser Micropump of the present invention, it comprise inside be provided with pump chamber 12 the pump housing 10, be located at going out head piece 11, the fluid infusion chamber 13 be communicated with described pump chamber 12 rear end, inserting described pump chamber 12 and extend to optical fiber monomer 16 or the fiber bundle of pump chamber 12 front end of described pump chamber 12 front end, the rear end of described optical fiber monomer or fiber bundle is connected with laser 15.By induced with laser cavitation micro pump technology, use laser 15 Emission Lasers bundle 17 and imported the front end of laser beam 17 to pump chamber 12 by optical fiber, utilize Laser Focusing liquid medium in micro channel to produce cavitation bubble 18, utilize the fluid-propelled speed and the flowing of propelling force driving fluid that produce in cavitation bubble 18 growth and collapse process.Cavitation bubble 18 expands extrusion fluid, and the fluid that internal pressure is balanced has kinetic energy, overcoming adhesive force and goes out the pipe resistance of head piece, being released by the fluid compression in pump chamber 12 from going out head piece 11.Then cavitation bubble 18 is crumbled and fall space contraction, and under the promotion of balance pressure, fluid infusion chamber 13 is pump chamber 12 fluid replacement, achieves the pump of fluid in pump chamber 12 and is drawn through journey.The effect of similar Micropump is formed further by laser multiple pulse continuous action, thus comparatively simple laser Micropump device driving fluid trace flow velocity can be used controllably to export continuously, this Micropump has the Millisecond reaction time and does not have complicated moving parts, for the driving problems solving microfluid provides a kind of new thought.Meanwhile, because this Micropump does not exist the narrow limitation of special dimension application, microorganism medical science, MEMS, micro channel can be widely used in, even the field such as ink-jet printer.
Induced with laser cavitation micro pump technology of the present invention utilizes Laser Focusing liquid medium in micro channel to produce cavitation bubble, under the effect of inside and outside differential pressure, cavitation bubble can grow gradually, when growing into a certain degree, by the phenomenon that crumbles and fall, utilize the fluid-propelled speed and the flowing of propelling force driving fluid that produce in cavitation bubble growth and collapse process, can laser multiple pulse continuous action be passed through further, continuously promote fluid flowing in micro channel, form the effect of similar Micropump.
More preferably, the described pump housing is provided with the end plug relative with going out head piece, the through hole that described end plug plug is offered in described pump housing rear end, and described end plug has confession optical fiber monomer or fiber bundle passes and forms the perforation of fluid-tight.Laser shown in figure is launched by laser, require laser energy, pulse frequency, laser facula size is adjustable, realize size and the forming position of cavitation bubble 18, in cavitation processes fluid-propelled speed and propelling force controlled, effectively to control by Optimization Technology the effect that induced with laser cavitation Micropump drives microfluidic flow in micro channel.
Be contained with working solution in the pump chamber 12 of the Micropump body shown in figure, laser focuses in the working solution of micro-pump body by fiber guides, and cavitation phenomenon occurs in induction.Its character (as viscosity, surface tension) can be changed by the type (as water, glycerine, water and glycerine mixed solution etc.) changing working solution, the dynamics of further research cavitation bubble drives the impact of microfluidic flow effect on Micropump, to improve fluid-propelled speed and propelling force further, thus optimize reaction time and the drive efficiency of Micropump.
Micropump body shown in figure, its restrained condition to cavitation bubble can be changed by the shape (as circular, square, triangle etc.) changing Micropump body, the dynamics of further research cavitation bubble in difformity micro channel inside, to explore the impact of different micro channel Shapes body fltting speed and propelling force further, find most suitable Micropump shape, make Micropump obtain optimum reaction time and drive efficiency.
Head piece 11 shown in figure, its restrained condition to bubble collapse microjet can be changed by the size and shape (as circular, square, triangle etc.) changing head piece, the flow, the flow velocity that realize out head piece jet are adjustable, even can accomplish that single drop goes out the effect of stream, realize various different process requirement.
The laser of fiber guides shown in figure enters Micropump body place inside, decreases the loss of energy, improves the utilization ratio of energy.Guide laser to enter in Micropump body by single-path optical fiber, focus on induction cavitation bubble and drive working solution, make to produce Single bubble in Micropump body, thus accurate control of fluid flowing, realize out head piece 11 working solution list drop and go out stream.Laser also can form cavity group by multi-channel optical fibre and carry out Fluid Motion Driven By Moving in the pump chamber 12 of Micropump body, strengthens the effect that Micropump drives microfluidic flow, realizes out head piece 11 working solution and goes out stream continuously.
Above-mentioned whole process has set forth laser Emission Lasers, focused in Micropump body by single channel or multi-channel optical fibre and in working solution, produce single cavitation bubble or cavitation bubble group, by the fltting speed that produces in cavitation bubble or cavitation bubble group growth and collapse process and the flowing of propelling force driving fluid, propose a kind of novel Micropump principle.The flowing of induced with laser cavitation driving fluid comprises two kinds of situations: the first situation, when the transmitting cycle of laser pulse is less than the pulsation period of cavity, when first cavitation bubble is in oscillation phase, laser has sent second cavitation bubble, second cavitation bubble and first public effect of cavitation bubble, continues propelling fluid effect, form continuous print Micropump effect, meanwhile, cavitation bubble group can be formed by multi-channel optical fibre, thus strengthen promoting effect continuously; The second situation, when the transmitting cycle of laser pulse is greater than the pulsation period of cavity, when laser sends second cavity, first cavitation oscillation may terminate, fluid is in steady state, fluid-propelled speed and the propelling force of at this moment second time cavitation processes generation continue driving fluid flowing, form the Micropump effect of pulsation, its pulse duration can carry out regulation and control effectively by parameters such as laser, liquid and micro channel, simultaneously, by to the effective control going out head piece 11, fluid list drop can also be realized and go out stream.
Laser Focusing liquid medium in micro channel is produced cavitation bubble, utilize the fluid-propelled speed and the flowing of propelling force driving fluid that produce in cavitation bubble growth and collapse process, because the whole pulsation period of cavitation bubble is quite short, Millisecond even Microsecond grade can be reached, the micropump of other type relatively, it has the advantage in grade reaction time, is that other type Micropump institute is incomparable.There is not complicated component and movable part in this Micropump, and has the grade even reaction time of Microsecond grade, can enrich and improve microfluid Non mechanical driving technical system by level the earth, promoting micro-fluidic chip and develop to wider application.
The method cavitation bubble is produced by optical breakdown, by controlling the position of optical fiber, accurately can control Laser Focusing and producing cavitation bubble to the position that micro channel is inner suitable.In addition, by adjusting energy and the pulse frequency of laser beam, the factors such as the temperature that can produce the size of cavitation bubble, energy density and cavitation, pressure, shock strength and fluid-propelled speed, propelling force control, thus realize the accurate control of minute yardstick fluid motion in chip.With other Drive Control Technique unlike, laser beam can be easy to focus on several micron dimension, be applicable to the manipulation of microfluid in less than 50 microns micro channel, make it in the conveying of micro/nano-scale fluid, have sizable advantage, this is that other Non mechanical driving technology such as electric drive is difficult to realize.Therefore, there is not the circumscribed problem of application in it, can be widely used in microorganism medical science, MEMS, micro channel, even the field such as ink-jet printer.
More preferably, the front end of described optical fiber monomer 16 or fiber bundle towards described go out head piece 11, thus cavitation bubble is grown towards going out head piece 11, the bubble of generation has more towards the Driving force going out head piece 11, is easier to liquid to release from going out head piece 11.
More preferably, described fluid infusion chamber 13 and described pump chamber 12 are mutually vertical or be connected to form acute angle, fluid infusion chamber 13 and pump chamber 12 that the amount of being easier to is communicated with maintain internal pressure and balance, micro-vibratory drive liquid from go out head piece 11 flow out while, less pressure influence is produced to fluid infusion chamber 13, the vibration wave that bubble produces does not pass to fluid infusion chamber and is just dissipated by absorption of fluids, thus can fluid replacement sustainedly and stably.
Above disclosedly be only the preferred embodiments of the present invention, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the present patent application the scope of the claims is done, still belong to the scope that the present invention is contained.
Claims (4)
1. an induced with laser Micropump, it is characterized in that: comprise inside be provided with pump chamber the pump housing, be located at going out head piece, the fluid infusion chamber be communicated with described pump chamber rear end, inserting described pump chamber and extend to optical fiber monomer or the fiber bundle of pump chamber front end of described pump chamber front end, the rear end of described optical fiber monomer or fiber bundle is connected with laser.
2. induced with laser Micropump according to claim 1, it is characterized in that: the described pump housing is provided with the end plug relative with going out head piece, the through hole that described end plug plug is offered in described pump housing rear end, described end plug has confession optical fiber monomer or fiber bundle passes and forms the perforation of fluid-tight.
3. induced with laser Micropump according to claim 1, is characterized in that: the front end of described optical fiber monomer or fiber bundle towards described go out head piece.
4. induced with laser Micropump according to claim 1, is characterized in that: described fluid infusion chamber and described pump chamber are mutually vertical or be connected to form acute angle.
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| CN201410700301.5A CN104405613A (en) | 2014-11-28 | 2014-11-28 | Laser-induced micro pump |
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| CN201410700301.5A CN104405613A (en) | 2014-11-28 | 2014-11-28 | Laser-induced micro pump |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105835032A (en) * | 2016-03-18 | 2016-08-10 | 浙江大学滨海产业技术研究院 | Driving device used for microrobot in liquid |
| CN109051819A (en) * | 2018-08-27 | 2018-12-21 | 江苏大学 | A kind of apparatus and method transporting particle using vacuole |
| CN110653667A (en) * | 2019-10-28 | 2020-01-07 | 河南工业大学 | Laser-induced cavitation auxiliary liquid jet polishing device and nozzle for jet polishing |
| CN111637033A (en) * | 2020-04-10 | 2020-09-08 | 桂林电子科技大学 | Micro-cavity type photo-thermal micro-pump based on annular core capillary optical fiber |
| CN111637032A (en) * | 2020-04-10 | 2020-09-08 | 桂林电子科技大学 | Photo-thermal micropump based on capillary optical fiber |
| CN112577624A (en) * | 2020-12-03 | 2021-03-30 | 清华大学 | Laser-induced fluorescence temperature measuring device and using method thereof |
| CN115163465A (en) * | 2022-08-02 | 2022-10-11 | 江苏大学 | Pulse type miniature valveless diaphragm pump based on cavitation effect |
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| US20030021694A1 (en) * | 2001-07-25 | 2003-01-30 | Yevin Oleg A. | Nano and micro metric dimensional systems and methods for nanopump based technology |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105835032A (en) * | 2016-03-18 | 2016-08-10 | 浙江大学滨海产业技术研究院 | Driving device used for microrobot in liquid |
| CN109051819A (en) * | 2018-08-27 | 2018-12-21 | 江苏大学 | A kind of apparatus and method transporting particle using vacuole |
| CN110653667A (en) * | 2019-10-28 | 2020-01-07 | 河南工业大学 | Laser-induced cavitation auxiliary liquid jet polishing device and nozzle for jet polishing |
| CN110653667B (en) * | 2019-10-28 | 2021-09-17 | 河南工业大学 | Laser-induced cavitation auxiliary liquid jet polishing device and nozzle for jet polishing |
| CN111637033A (en) * | 2020-04-10 | 2020-09-08 | 桂林电子科技大学 | Micro-cavity type photo-thermal micro-pump based on annular core capillary optical fiber |
| CN111637032A (en) * | 2020-04-10 | 2020-09-08 | 桂林电子科技大学 | Photo-thermal micropump based on capillary optical fiber |
| CN112577624A (en) * | 2020-12-03 | 2021-03-30 | 清华大学 | Laser-induced fluorescence temperature measuring device and using method thereof |
| CN115163465A (en) * | 2022-08-02 | 2022-10-11 | 江苏大学 | Pulse type miniature valveless diaphragm pump based on cavitation effect |
| CN115163465B (en) * | 2022-08-02 | 2024-03-19 | 江苏大学 | Pulse miniature valveless diaphragm pump based on cavitation effect |
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Application publication date: 20150311 |