CN103758734B - A kind of fermat spiral pipe Valveless piezoelectric pump - Google Patents
A kind of fermat spiral pipe Valveless piezoelectric pump Download PDFInfo
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- CN103758734B CN103758734B CN201310555460.6A CN201310555460A CN103758734B CN 103758734 B CN103758734 B CN 103758734B CN 201310555460 A CN201310555460 A CN 201310555460A CN 103758734 B CN103758734 B CN 103758734B
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- flow pipe
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Abstract
A kind of fermat spiral pipe of the present invention Valveless piezoelectric pump, the pump housing is provided with lower half portion of import buffer cavity, outlet buffer cavity, inlet flow tube, outlet flow pipe and pump chamber, inlet flow tube is communicated with composition by a Fermat spiral flow pipe with the ram's horns be arranged symmetrically with relative to Fermat spiral flow pipe center line with outlet flow pipe, second ram's horns is the DC tube that geometric structure diamete is identical with the 3rd ram's horns, and both are the symmetrical and centerline axis parallel of central axis and Fermat spiral flow pipe relative to Fermat spiral flow pipe center line; First ram's horns is the semicircular pipe that geometric structure diamete is identical with the 3rd ram's horns, and both are symmetrical relative to Fermat spiral flow pipe center line; Fermat spiral flow pipe has the good nature of radius of curvature linear transitions, and by uniform horizontal force when fluid flows wherein, flowing is stable, and vibrate little, energy consumption is low, and efficiency is high.
Description
Technical field
The present invention relates to Micro Fluid Transfer and control and micro mechanical technology field, specifically refer to a kind of novel fermat spiral pipe Valveless piezoelectric pump.
Background technique
Piezoelectric pump is the one of mechanical type Micropump, belongs to displacement pump, is widely used in the conveying of medicine trace, cell separation, electronic product cooling, the micro-injection of fuel, chemical microanalysis, Flows turn fields such as twisting control.Current piezoelectric pump is mainly divided into valve piezoelectric pump and Valveless piezoelectric pump two class, Valveless piezoelectric pump is without movable valve block, structure is simple, be more suitable for miniaturization and microminiaturization, the job requirement under high frequency can be met, overcome the shortcoming that valve piezoelectric pump cutout has noise, anti-fatigue behaviour is good, avoids some sensitive medias to be affected.Most of Valveless piezoelectric pump is connected with pump chamber by two special construction stream pipes, differences in flow resistance when utilizing fluid to flow along special construction stream pipe different direction produces pumping effect, common special construction stream pipe has conical pipe, tesla pipe, vortex tube, three-way pipe etc.
Tapered tube configuration is simple, be easy to design and processing, but its forward and reverse differences in flow resistance is less, causes the efficiency of Micropump very low; Tesla pipe is also referred to as steel tubing in different shapes, its main structure formed with straight channel collocation curved channel, fluid when reciprocal flowing due to the difference of flow channel length and the inertia effect of fluid, produce the net flow of Way out, but its forward and reverse differences in flow resistance is equally very little, the net flow that Micropump obtains within an operation cycle is limited; Vortex tube essence is the whirlpool region adding a series of triangle or circular arc at two dimensional surface conical pipe wall, these triangle vortex districts and conical flow pipe together constitute swirler passages, but the existence in vortex face increases the manufacture difficulty of runner, and forward and reverse flow resistance of this stream pipe is all very large, make Micropump energy consumption large, efficiency is low; Three-way pipe comprises " Y " type pipe and " V " type pipe etc., " Y " type Guan Youyi collecting fitting and two ram's horns composition " Y " fonts, its collecting fitting and ram's horns are uniform section rectangular tube, " V " type Guan Youyi uniform section rectangular tube is collecting fitting and two diffusion (contraction) ram's horns compositions, three-way pipe reduces forward flow resistance to a certain extent, improve reverse flow resistance, Micropump is made to obtain higher net flow along forward within an operation cycle, but the frictional loss when design of straight line type tube wall makes fluid flow is comparatively large, and energy consumption is higher.Publication number is that the Chinese invention patent application of CN102330662A discloses a kind of Valvless piezoelectric pump employing fermat helical flow pipe, the pump chamber of this Valveless piezoelectric pump is provided with the first Fermat spiral flow pipe and the first DC tube, first described Fermat spiral flow pipe one end is connected with pump chamber, and the other end is connected with the fluid inlet be arranged on the pump housing; Described first DC tube one end is connected with pump chamber, and the other end is connected with the fluid output be arranged on the pump housing; The first described Fermat spiral flow pipe is take fluid inlet as starting point dextrorotation to stream pipe.This kind of structural flow pipe uses overall fermat spiral to construct stream pipe, runner is long, all very large along the loss of positive and negative direction when fluid flows in bent flowtube, simultaneously owing to being subject to the effect of centrifugal force, cross section forms Secondary Flow, local resistance is increased, cause secondary flow loss, and DC tube used is without flow resistance characteristic, thus the efficiency of Micropump is lower, structure is relatively complicated in addition, is unfavorable for integrated and microminiaturized.
Ancient Greek Mathematics man and mechanics scientist Archimedes have just done detailed discussion to the geometric properties of plane systematic helical in his treatise " opinion helical ", people are referred to as " Archimedes spiral ", and mathematicians had found again fermat spiral, lituus, logarithmic spiral, hyperbolic conchoid, cylindrical spiral, conical etc. afterwards.Helical flow pipe has superior structural characteristics and good hydrodynamics, is conducive to integrated arrangement, is widely used in the energy, warship, submarine, space station, ship power, petrochemical industry, space flight and aviation, is the field such as electrical cooling and cryogenic technique.
Summary of the invention
The object of the invention is the deficiency in order to avoid above-mentioned technology, mainly for the problem existing for existing Valveless piezoelectric pump as movement disorder, the ill effect such as viscous resistance is large, boundary layer is easily separated and propose that a kind of yardstick is little, flowing is stable, energy consumption is low, efficiency is high, vibrate little novel fermat spiral pipe Valveless piezoelectric pump, expands the application area of spiral flow tube technology in microfluid machinery field simultaneously.
The technical solution used in the present invention is: comprise the pump housing and pump cover, pump cover is provided with upper half part of pump inlet, pump discharge and pump chamber, the pump housing is provided with lower half portion of import buffer cavity, outlet buffer cavity, inlet flow tube, outlet flow pipe and pump chamber, and inlet flow tube is identical with outlet flow tubular construction and coaxially arranged and equidistant with the pump chamber center of circle, inlet flow tube one end is communicated with import buffer cavity, the other end is communicated with pump chamber, outlet flow pipe one end is communicated with pump chamber, the other end is communicated with outlet buffer cavity, import buffer cavity is communicated with pump inlet and pump discharge respectively with outlet buffer cavity, inlet flow tube is communicated with composition by a Fermat spiral flow pipe with the ram's horns be arranged symmetrically with relative to Fermat spiral flow pipe center line with outlet flow pipe, second ram's horns is the DC tube that geometric structure diamete is identical with the 3rd ram's horns, both are the symmetrical and centerline axis parallel of central axis and Fermat spiral flow pipe relative to Fermat spiral flow pipe center line, first ram's horns is the semicircular pipe that geometric structure diamete is identical with the 3rd ram's horns, and both are symmetrical relative to Fermat spiral flow pipe center line, second ram's horns one end is communicated with the first ram's horns, and the other end is communicated with pump chamber, and the 3rd ram's horns one end is communicated with the 4th ram's horns, and the other end is communicated with pump chamber, and the first ram's horns and the 4th ram's horns are through with the large end of Fermat spiral flow pipe respectively.
The profile line of described Fermat spiral flow pipe is by Fermat helix equation
the cornerite determined is the Fermat helical segment of 45 °, polar angle
it is 0 ° ~ 4050 °; The length of Fermat spiral flow pipe is 1200 μm ~ 3000 μm, is highly 80 μm ~ 150 μm, and the smallest cross-sectional width of small end is 120 μm ~ 170 μm, and small end mouth of pipe fillet radius is 40 μm ~ 80 μm.
The invention has the beneficial effects as follows: helical flow Manifold technology and piezoelectric pump technology organically combine by the present invention, profile line is adopted to be the helical flow pipe of Fermat helix and the tube flowing structure of ram's horns combination, compared with conventional diffusion/collapsible tube Valveless piezoelectric pump and three-way pipe Valveless piezoelectric pump, Fermat spiral flow pipe has the good nature of radius of curvature linear transitions, by uniform horizontal force when fluid flows wherein, flowing is stable, vibrates little, energy consumption is low, and efficiency is high; When fluid is along inlet flow tube (outlet flow pipe) forward flow, ram's horns is to a certain degree serving pumping action, thus controls boundary layer separation, prevents flow separation, reduces loss, forward flow resistance is reduced, and the flow of logical flow tube increases; When fluid is along inlet flow tube (outlet flow pipe) reverse flow, relative to the reasonable application of the ram's horns that flow direction and wall have certain tilt angle, discrete longitudinal Vortex can be generated, certain flow-disturbing effect is played to main flow, reverse flow resistance is increased, the flow of logical flow tube reduces, then can obtain higher net flow an operation cycle along forward flow direction, improve the efficiency of Valveless piezoelectric pump; Meanwhile, this pump can work at higher frequencies, and anti-electromagnetic interference capability is strong, and flow is easy to control, and can be applicable to Biological Chip, micro-fluidic chip, the fields such as micro-full analytical system and clinical medicine trace transfusion system.
Accompanying drawing explanation
Fig. 1 is the overall structure sectional view of a kind of fermat spiral pipe Valveless piezoelectric pump of the present invention;
Fig. 2 is that the A-A of Fig. 1 is to sectional drawing;
Fig. 3 is the I partial enlarged drawing of inlet flow tube 7 or outlet flow pipe 9 in Fig. 2;
Fig. 4 is the geometrical construction enlarged view of inlet flow tube 7 or outlet flow pipe 9 in Fig. 2;
Fig. 5 is that the B-B of Fig. 2 is to sectional drawing;
Fig. 6 is M partial enlarged drawing in Fig. 5;
Fig. 7 is the Fermat helix schematic diagram under the present invention's polar coordinate system used;
Fig. 8 is the fundamental diagram of inlet flow tube 7 suction process in the present invention;
Fig. 9 is the fundamental diagram of inlet flow tube 7 discharge process in the present invention;
The fundamental diagram of Figure 10 suction process of the present invention;
The fundamental diagram of Figure 11 discharge process of the present invention;
In figure: 1. pump inlet; 2. pump cover; 3. piezoelectric vibrator; 4. pump chamber; 5. pump discharge; 6. import buffer cavity; 7. inlet flow tube; 8. the pump housing; 9. outlet flow pipe; 10. export buffer cavity; 11. fermat spiral pipes; 12,13,14,15. ram's hornss.
Embodiment
With reference to Fig. 1, Fig. 2 and Fig. 5, the present invention includes the pump housing 8, pump cover 2 and piezoelectric vibrator 3, the material of the pump housing 8 is silicon chip, the material of pump cover 2 is glass, pump cover 2 utilize laser processing technology process upper half part of pump inlet 1, pump discharge 5 and pump chamber 4, the pump housing 8 utilize dry etch process process lower half portion of import buffer cavity 6, outlet buffer cavity 10, inlet flow tube 7, outlet flow pipe 9 and pump chamber 4, inlet flow tube 7 is identical and coaxially arranged with outlet flow pipe 9 structure, and equidistant with pump chamber 4 center of circle; Inlet flow tube 7 one end is communicated with import buffer cavity 6, the other end is communicated with pump chamber 4, outlet flow pipe 9 one end is communicated with pump chamber 4, the other end is communicated with outlet buffer cavity 10, and import buffer cavity 6 is communicated with pump inlet 1 and pump discharge 5 respectively with outlet buffer cavity 10, piezoelectric vibrator 3 is fixedly bonded in directly over pump cover 2 with binder together with being fitted tightly by anode linkage technique by the pump housing 8 and pump cover 2.
With reference to Fig. 2, Fig. 3, inlet flow tube 7 is communicated with composition by a Fermat spiral flow pipe 11 with the ram's horns be arranged symmetrically with relative to Fermat spiral flow pipe 11 center line with outlet flow pipe 9, ram's horns 13 and ram's horns 14 are DC tube, both are arranged symmetrically with relative to Fermat spiral flow pipe 11 center line, the central axis of ram's horns 13 and ram's horns 14 and the centerline axis parallel of Fermat spiral flow pipe 11; Ram's horns 12 and ram's horns 15 are semicircular pipe, and both are arranged symmetrically with relative to Fermat spiral flow pipe 11 center line; Ram's horns 13 one end is communicated with ram's horns 12, and the other end is communicated with pump chamber 4, and ram's horns 14 one end is communicated with ram's horns 15, and the other end is communicated with pump chamber 4, and ram's horns 12 and ram's horns 15 are through with the large end of Fermat spiral flow pipe 11 respectively; Ram's horns 13 is identical with the geometric structure diamete of ram's horns 14, and ram's horns 12 is identical with the geometric structure diamete of ram's horns 15.
With reference to Fig. 4, Fig. 6 and Fig. 7, the profile line of Fermat spiral flow pipe 11 is by Fermat helix equation
the cornerite φ determined is the Fermat helical segment MN of 45 °, wherein polar angle
it is 0 ° ~ 4050 °; The length of Fermat spiral flow pipe 11
it is 1200 μm ~ 3000 μm, highly
be 80 μm ~ 150 μm, the smallest cross-sectional width of small end
be 120 μm ~ 170 μm, small end mouth of pipe fillet radius
it is 40 μm ~ 80 μm; The central axis of ram's horns 13 and ram's horns 14 and the distance of Fermat spiral flow pipe 11 central axis
be 430 μm ~ 980 μm, length
be 400 μm ~ 1000 μm, width
be
, highly
all identical with the height of Fermat spiral flow pipe 11; The center of circle of ram's horns 12 and ram's horns 15 is to the distance of Fermat spiral flow pipe 11 central axis
be 290 μm ~ 630 μm, interior semicircle radius
be 110 μm ~ 270 μm, outer semicircle radius
be 180 μm ~ 440 μm.
With reference to Fig. 9, Figure 10, Figure 11, working principle of the present invention is: load at piezoelectric vibrator 3 two ends alternating voltage signal (sinusoidal or square-wave signal) afterwards piezoelectric vibrator 3 to occur bending and deformation and with electric voltage frequency up-down vibration, this vibration drives the fluid flowing in pump chamber 4; The motion of piezoelectric vibrator 3 can be divided into upwards displacement movement and downward displacement movement, then in pump chamber 4, flow process is just divided into suction process and discharge process accordingly.When piezoelectric vibrator 3 upwards vibrates, pump chamber 4 volume increases, pressure in pump chamber 4 reduces and is less than outside pressure, thus fluid flows into pump chamber 4 by pump inlet 1 and pump discharge 5 through inlet flow tube 7 and outlet flow pipe 9, at this moment piezoelectric pump is in suction condition, because inlet flow tube 7 is different with the flow resistance coefficient on outlet flow pipe 9 positive and negative direction, make the flow being flow to pump chamber 4 by pump inlet 1 through inlet flow tube 7
be greater than the flow being flow to pump chamber 4 by pump discharge 5 through outlet flow pipe 9
, because inlet flow tube 7 and outlet flow pipe 9 all adopt profile line to be helical flow pipe 11 and the ram's horns 12 of Fermat helix, 13, 14, the tube flowing structure of 15 combinations, therefore in this suction process, fluid flows stable when flowing through Fermat spiral flow pipe 11 by import buffer cavity 6, energy loss is little, and be communicated with the ram's horns 12 of Fermat spiral flow pipe 11 and pump chamber 4, 13, 14, 15 can enter pump chamber 4 the fluid conduction of Fermat spiral flow pipe 11 wall wish stagnation, serve pumping action to a certain extent, this pumping action can make the fluid in Fermat spiral flow pipe 11 boundary layer overcome the effect of reverse differential pressure and continue to flow to pump chamber 4, thus prevent to some extent boundary layer separation, reach the effect reducing viscous friction drag, make the flow being flowed into pump chamber 4 by inlet flow tube 7
increase, moving to pump chamber 4 center by under the effect of ram's horns 12,13,14,15 fluid because sudden expansion acts on a pair whirlpool that Fermat spiral flow pipe 11 goes out interruption-forming simultaneously, in moving process, the dissipation in whirlpool becomes slow, vorticity diminishes, effective range increases, thus suppresses or delay the generation of flow separation further, same, fluid by export buffer cavity 10 flow through Fermat spiral flow pipe 11 time, compared to straight wall flow pipe (diffusion/collapsible tube), Fermat spiral flow pipe 11 pairs of flow resistances are larger, and fluid can generate discrete longitudinal Vortex when flowing through ram's horns 12,13,14,15, certain agitation is played to main flow, reverse flow resistance is increased, the flow of logical flow tube
further reduction, the flow to amount total at suction process piezoelectric pump is
, when piezoelectric vibrator 3 vibrates downwards, pump chamber 4 volume reduces, pressure increase in pump chamber 4 and be greater than outside pressure, thus the inlet flow tube 7 of fluid through pump chamber 4 both sides and outlet flow pipe 9 flow out pump chamber 4 by pump inlet 1 and pump discharge 5, at this moment piezoelectric pump is in discharge state, this process is contrary with pump suction process, the flow that pump chamber 4 is discharged by pump inlet 1 through inlet flow tube 7
be less than the flow of being discharged by pump discharge 5 through outlet flow pipe 9 by pump chamber 4
, in total discharge of discharge process piezoelectric pump be
, the amplitude of the present invention's piezoelectric vibrator 3 in suction process and discharge process is certain, and the flow flowing into pump chamber 4 is equal with the flow flowing out pump chamber 4, is designated as
, then have
, a discharge process and suction process composition one-period, the pump discharge of one-period is flow out the flow of pump chamber 4 and the difference of the flow of inflow pump chamber 4 by outlet flow pipe 9
, or flow into pump chamber 4 flow and the difference of flow flowing out pump chamber 4 by inlet flow tube 7
, then pump discharge in one-period
for:
，
This value is greater than zero, therefore Valveless piezoelectric pump is within an operation cycle, the flow flowing into pump chamber 4 by inlet flow tube 7 in suction process is greater than the flow of discharging in discharge process, outlet flow pipe 9 is then just in time contrary, namely the flow flowing into pump chamber 4 in suction process is less than the flow of discharging in discharge process, finally achieve the one-way flow of fluid, complete pump function.
Claims (3)
1. a fermat spiral pipe Valveless piezoelectric pump, comprise the pump housing (8) and pump cover (2), pump cover (2) is provided with upper half part of pump inlet (1), pump discharge (5) and pump chamber (4), the pump housing (8) is provided with lower half portion of import buffer cavity (6), outlet buffer cavity (10), inlet flow tube (7), outlet flow pipe (9) and pump chamber (4), and inlet flow tube (7) is identical with outlet flow pipe (9) structure and coaxially arranged and equidistant with pump chamber (4) center of circle; Inlet flow tube (7) one end is communicated with import buffer cavity (6), the other end is communicated with pump chamber (4), outlet flow pipe (9) one end is communicated with pump chamber (4), the other end is communicated with outlet buffer cavity (10), import buffer cavity (6) is communicated with pump inlet (1) and pump discharge (5) respectively with outlet buffer cavity (10), it is characterized in that: inlet flow tube (7) is communicated with composition by a Fermat spiral flow pipe (11) with the ram's horns be arranged symmetrically with relative to Fermat spiral flow pipe (11) center line with outlet flow pipe (9); The small end of the Fermat spiral flow pipe (11) in inlet flow tube (7) is communicated with import buffer cavity (6), large end is communicated with pump chamber (4); The small end of the Fermat spiral flow pipe (11) in outlet flow pipe (9) is communicated with pump chamber (4), large end is communicated with outlet buffer cavity (10); Second ram's horns (13) and the 3rd ram's horns (14) are the identical DC tube of geometric structure diamete, and both are the symmetrical and centerline axis parallel of central axis and Fermat spiral flow pipe (11) relative to Fermat spiral flow pipe (11) center line; First ram's horns (12) and the 4th ram's horns (15) are the identical semicircular pipe of geometric structure diamete, and both are symmetrical relative to Fermat spiral flow pipe (11) center line; Second ram's horns (13) one end is communicated with the first ram's horns (12), the other end is communicated with pump chamber (4), 3rd ram's horns (14) one end is communicated with the 4th ram's horns (15), the other end is communicated with pump chamber (4), the first ram's horns (12) and the 4th ram's horns (15) through with the large end of Fermat spiral flow pipe (11) respectively.
2. a kind of fermat spiral pipe Valveless piezoelectric pump according to claim 1, is characterized in that: the profile line of described Fermat spiral flow pipe (11) is by Fermat helix equation
the cornerite determined is the Fermat helical segment of 45 °, polar angle
it is 0 ° ~ 4050 °; The length of Fermat spiral flow pipe (11) is 1200 μm ~ 3000 μm, is highly 80 μm ~ 150 μm, and the smallest cross-sectional width of small end is 120 μm ~ 170 μm, and small end mouth of pipe fillet radius is 40 μm ~ 80 μm.
3. a kind of fermat spiral pipe Valveless piezoelectric pump according to claim 2, is characterized in that: the distance of the central axis of second, third ram's horns (13,14) and the central axis of Fermat spiral flow pipe (11) is 430 μm ~ 980 μm, length
be 400 μm ~ 1000 μm, width is
, highly all identical with the height of Fermat spiral flow pipe (11); The first, the center of circle of the 4th ram's horns (12,15) is 290 μm ~ 630 μm to the distance of Fermat spiral flow pipe (11) central axis, and interior semicircle radius is 110 μm ~ 270 μm, and outer semicircle radius is 180 μm ~ 440 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555460.6A CN103758734B (en) | 2013-11-11 | 2013-11-11 | A kind of fermat spiral pipe Valveless piezoelectric pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310555460.6A CN103758734B (en) | 2013-11-11 | 2013-11-11 | A kind of fermat spiral pipe Valveless piezoelectric pump |
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| Publication Number | Publication Date |
|---|---|
| CN103758734A CN103758734A (en) | 2014-04-30 |
| CN103758734B true CN103758734B (en) | 2016-01-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2013308C1 (en) * | 1991-03-04 | 1994-05-30 | Товарищество с ограниченной ответственностью "Рондо" | Vortex propeller |
| CN200955485Y (en) * | 2006-07-14 | 2007-10-03 | 北京工业大学 | Single-chip-type flow-pipe valve-free piezoelectric pump |
| CN102135087A (en) * | 2011-04-12 | 2011-07-27 | 江苏大学 | Diffusion/contraction combined pipe valveless piezoelectric pump |
| CN102330662A (en) * | 2011-06-21 | 2012-01-25 | 无锡长辉机电科技有限公司 | Fermat spiral flow pipe valveless piezoelectric pump |
| CN102331255A (en) * | 2011-06-21 | 2012-01-25 | 无锡长辉机电科技有限公司 | Gyro based on Fermat helical flow pipe valveless piezoelectric pump |
| CN102691648A (en) * | 2012-05-02 | 2012-09-26 | 江苏大学 | Valveless piezoelectric pump with axisymmetric logarithmic spiral pipe |
-
2013
- 2013-11-11 CN CN201310555460.6A patent/CN103758734B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2013308C1 (en) * | 1991-03-04 | 1994-05-30 | Товарищество с ограниченной ответственностью "Рондо" | Vortex propeller |
| CN200955485Y (en) * | 2006-07-14 | 2007-10-03 | 北京工业大学 | Single-chip-type flow-pipe valve-free piezoelectric pump |
| CN102135087A (en) * | 2011-04-12 | 2011-07-27 | 江苏大学 | Diffusion/contraction combined pipe valveless piezoelectric pump |
| CN102330662A (en) * | 2011-06-21 | 2012-01-25 | 无锡长辉机电科技有限公司 | Fermat spiral flow pipe valveless piezoelectric pump |
| CN102331255A (en) * | 2011-06-21 | 2012-01-25 | 无锡长辉机电科技有限公司 | Gyro based on Fermat helical flow pipe valveless piezoelectric pump |
| CN102691648A (en) * | 2012-05-02 | 2012-09-26 | 江苏大学 | Valveless piezoelectric pump with axisymmetric logarithmic spiral pipe |
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