CN102330662A - Fermat spiral flow pipe valveless piezoelectric pump - Google Patents
Fermat spiral flow pipe valveless piezoelectric pump Download PDFInfo
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- CN102330662A CN102330662A CN201110167544A CN201110167544A CN102330662A CN 102330662 A CN102330662 A CN 102330662A CN 201110167544 A CN201110167544 A CN 201110167544A CN 201110167544 A CN201110167544 A CN 201110167544A CN 102330662 A CN102330662 A CN 102330662A
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Abstract
The invention relates to a fermat spiral flow pipe valveless piezoelectric pump which comprises a pump body, a pump cavity, a first fermat spiral flow pipe and a first direct flow pipe, wherein the pump body consists of an upper cover and a lower cover which are connected in a seal mode; the pump cavity containing piezoelectric vibrators is arranged between the upper cover and the lower cover; the first fermat spiral flow pipe and the first direct flow pipe are arranged on the pump cavity; one end of the first fermat spiral flow pipe is connected with the pump cavity, and the other end of the first fermat spiral flow pipe is connected with a fluid inlet arranged on the pump body; and one end of the first direct flow pipe is connected with the pump cavity, and the other end of the first direct flow pipe is connected with a fluid outlet arranged on the pump body. According to the fermat spiral flow pipe valveless piezoelectric pump provided by the invention, the spiral low pipe technology and the piezoelectric technology are combined organically; compared with a conical flow pipe valveless piezoelectric pump, the fermat spiral flow pipe adopted has better unidirectional flowability, the energy loss of a flowing fluid is reduced, and the operation efficiency of the pump is improved; and simultaneously, the application range of the spiral flow pipe technology in the fields of heat transfer, mixing and the like is expanded, and the spiral flow pipe technology is especially suitable for the envioronment sensitive to the magnetic field.
Description
Technical field
The present invention relates to a kind of Valveless piezoelectric pump, relate in particular to a kind of Valveless piezoelectric pump that adopts scroll stream pipe.
Background technique
Press valve body classification if belong to the piezoelectric pump of positive displacement, can be divided into valve and Valveless piezoelectric pump are arranged.If valve is defined as: in the suction and discharge process of pump; Have a period at least, make between pump chamber and suction port or the exhaust port, produce disconnected mechanical device; So so-called " valveless " is exactly: at any time, all be communicated with between pump chamber and suction port or the exhaust port.At this moment, rely on special mechanical device during the one-way flow of fluid.This device has utilized the character of fluid, makes pump chamber be communicated with exhaust port with suction all the time, and can order about one-directional fluid flow.At present, the Valveless piezoelectric pump parts that adopt inverted each other collapsible tube and expanding duct to be used as controlling one-directional fluid flow relatively are typically the conical flow pipe more.Fig. 1 is a conical flow pipe Valveless piezoelectric pump, and the characteristics of this pump are simple in structure, can realize microminiaturization; But there is the sudden change of different cross section size in conical stream pipe, and energy loss is big, and flow is less, reverse fluid stopping poor performance, and these shortcomings have all influenced the application of piezoelectric pump in practical field.
Because spiral flow tube has characteristics such as superior structural characteristics, spontaneous centrifugal field, secondary flow and high efficient heat exchanging rate; Make the spiral flow tube technology in equal extensive application in field such as heat transfer, mixing; And have in recent years the researcher with the spiral flow tube technical application in doughnut mass transfer separation processes such as micro-filtration, nanofiltration, infiltration and film distillations, all obtained good effect.But these are used all is under the external world gives the prerequisite of flow of fluid power, to carry out; Like this spiral flow tube The Application of Technology is restricted; If the additional power source is an electromagnetic machine; That place at some electromagnetic susceptibilities just can not be used, and accurately controls following time of environment of fluid flow at needs, can not meet the demands.
Summary of the invention
1. technical problem: the technical problem that the present invention will solve provides a kind of Miniaturized, has better one-way flow characteristic, but the fermat spiral that fluid flow is accurately controlled stream pipe Valveless piezoelectric pump.Overcome shortcomings such as the reverse fluid stopping poor performance of existing Valveless piezoelectric pump, simultaneously, enlarged the application area of spiral flow tube technology in fields such as heat transfer, mixing.
2. technological scheme: in order to solve above-mentioned technical problem; Fermat spiral stream pipe Valveless piezoelectric pump of the present invention comprises the pump housing that is tightly connected and is formed by loam cake and lower cover; Be provided with the pump chamber that accommodates piezoelectric vibrator between loam cake and the lower cover, pump chamber is provided with first fermat spiral stream pipe and first DC tube; Described first fermat spiral stream Guan Yiduan is connected with pump chamber, and the other end is connected with fluid inlet; Described first DC tube, one end is connected with pump chamber, and the other end is connected with fluid output.Described fermat spiral stream pipe is the stream pipe of plane bending, because the central axis of this stream pipe belongs to fermat spiral, therefore should flow pipe called after " fermat spiral stream pipe ".Fermat spiral is a kind of of equiangular spiral, and is as shown in Figure 2.The fermat spiral polar equation is:
r＝θ1/2
Wherein, r is utmost point footpath, and θ is a polar angle.
Described first fermat spiral stream pipe can directly be connected with pump chamber, also can be connected with pump chamber through one second DC tube.
One end of described first DC tube is communicated with pump chamber, and the other end directly or through second fermat spiral stream pipe is connected with fluid output; Usually, the spiral flow tube of described first fermat spiral stream pipe for being provided with for the starting point clockwise direction with the fluid inlet, terminal point is tie point that links to each other with pump chamber or the tie point that links to each other with second DC tube; Described second fermat spiral stream pipe is for being the spiral flow tube that starting point counterclockwise is provided with the fluid output, and its terminal point is the tie point that links to each other with first DC tube.
Described pump chamber comprises and is positioned at lower cover and opening first groove towards loam cake, and is positioned at loam cake and opening second groove towards first groove, and first, second slot opening size is identical, constitutes cavity with piezoelectric vibrator.Described second recess edge is designed to stair-stepping through hole, and piezoelectric vibrator is bonded and fixed in second groove.
The circular vibrating reed that described piezoelectric vibrator is generally pasted by the piezoelectric ceramic of circle and tinsel, for the shape with the piezoelectric vibrator of circle adapts, the cross section of described pump chamber is rounded.
For the ease of processing, first, second fermat spiral stream pipe all directly carves on lower cover with first, second DC tube and first groove, and promptly fermat spiral stream pipe, DC tube and first groove and lower cover are one; Simultaneously, identical rectangular of the cross section of first, second fermat spiral stream pipe and first, second DC tube
During the fermat spiral of present technique scheme stream pipe Valveless piezoelectric pump work, piezoelectric ceramic and tinsel as the two poles of the earth, when the piezoelectric vibrator indirect current; The piezoelectric constant sector-meeting produces along its dilatation radially; Because piezoelectric ceramic and tinsel are bonded to one, and the radial expansion of piezoelectric ceramic and tinsel is different, so when piezoelectric ceramic produces dilatation radially; Tinsel also can produce dilatation; And flexible direction and piezoelectric ceramic are opposite, and then piezoelectric vibrator will inevitably produce vertically the reciprocal deformation vibration of (normal orientation of piezoelectric ceramic), the power source of piezoelectric vibrator as piezoelectric pump; Along with the axially back and forth deformation vibration of piezoelectric vibrator, thereby cause the volume cyclically-varying of piezoelectric pump pump chamber.Piezoelectric vibrator produces axial vibration under inverse piezoelectric effect, cause that pump chamber changes; Generally can an operation cycle of piezoelectric pump be divided into two stages: arrive upper dead center (maximum displacement of piezoelectric vibrator away from equilibrium location outside pump chamber) through the equilibrium position from lower dead centre (maximum displacement of piezoelectric vibrator away from equilibrium location in pump chamber) and be the suction journey stage of pump; Arriving lower dead centre from upper dead center through the equilibrium position is the scheduling stage of pump.Inhaling the journey stage, fluid gets into pump chamber along first fermat spiral stream pipe and first DC tube; In the scheduling stage, fluid flows out pump chamber along first fermat spiral stream pipe and first DC tube.Owing to receive the influence of rotation of the earth coriolis force and fluid spin coriolis force; Make along the suffered resistance of the fluid of pipe inflow of first fermat spiral stream and outflow inequality; And the volume size of inflow or effluent fluid is inversely proportional to the flow resistance size that flows pipe; Therefore comprehensive the suction journey and scheduling stage, the fluid volume that flows into pump chamber along first fermat spiral stream pipe is more than the fluid volume that flows out pump chamber, makes that having a net flow in the whole cycle flows from first fermat spiral of pump and manage first DC tube that flows to pump; See that from macroscopic view piezoelectric pump always makes fluid flow into from first fermat spiral stream pipe, flow out, thereby realized the one-way flow of fluid, realized the function of pump from first DC tube.
In like manner, when the fermat spiral of present technique scheme stream pipe Valveless piezoelectric pump has two fermat spirals stream pipes, piezoelectric ceramic and tinsel as the two poles of the earth; When the piezoelectric vibrator indirect current; Piezoelectric vibrator produces axial vibration under inverse piezoelectric effect, cause that pump chamber changes, and driving fluid comes and goes along two fermat spiral stream pipes and flows; Owing to receive the influence of rotation of the earth coriolis force and fluid spin coriolis force; To producing different effects along counterclockwise and right handed fluid, make along the resistance that fermat spiral stream pipe flows into and the fluid that flows out is suffered inequalityly, and flow into or flow resistance size that the volume size of effluent fluid and stream are managed is inversely proportional to; So when the pump chamber volume increases; Fluid is from first fermat spiral stream pipe and second fermat spiral stream pipe inflow pump chamber, and piezoelectric pump was in and inhaled the journey stage this moment, but inequality from the fluid volume of two stream pipe inflow pump chambers; When the pump chamber volume reduced, fluid was managed the outflow pump chamber from first fermat spiral stream pipe and second fermat spiral stream, and this moment, piezoelectric pump was in the scheduling stage, but inequality from the fluid volume of two stream pipe outflow pump chambers; Analysis is at piezoelectric pump from two stream pipes and inhales journey and scheduling during the stage; How much may be summarized to be of the fluid volume that flows into and flow out: piezoelectric pump be in inhale journey during the stage incoming fluid volume many, then piezoelectric pump be in scheduling during the stage volume of effluent fluid few; Piezoelectric pump be in inhale journey during the stage incoming fluid volume few, then piezoelectric pump be in scheduling during the stage volume of effluent fluid many; See that from macroscopic view piezoelectric pump always makes fluid flow pipe from one and flows into, and manages outflow from another stream, thereby has realized the one-way flow of fluid, has realized the function of pump.
3. beneficial effect: fermat spiral stream pipe Valveless piezoelectric pump of the present invention organically combines spiral flow tube technology and piezo technology; Adopted fermat spiral stream pipe; Compare with conical flow pipe Valveless piezoelectric pump and to have one-way flow property preferably; Reduce the energy loss of streaming flow, improved the working efficiency of pump; Meanwhile, enlarged the application area of spiral flow tube technology, especially be useful under the environment to magnetic-field-sensitive in fields such as heat transfer, mixing; In addition, in the Valveless piezoelectric pump of the present invention, the stream pipe is the rectangular cross-section, and its processing is close to plane processing, compares with circular section stream pipe, and especially under minute yardstick, the processing of rectangular cross-section stream pipe is fairly simple.
Description of drawings
Fig. 1 is a conical flow pipe Valveless piezoelectric pump schematic representation;
Fig. 2 is a fermat spiral under the rectangular coordinate system;
Fig. 3 is the perspective exploded view of first embodiment's fermat spiral stream pipe Valveless piezoelectric pump;
Fig. 4 is the perspective exploded view of second embodiment's fermat spiral stream pipe Valveless piezoelectric pump;
Fig. 5 is a fermat spiral stream pipe Valveless piezoelectric pump overall structure plan view;
Fig. 6 is a fermat spiral stream pipe Valveless piezoelectric pump overall structure A-A sectional view;
Fig. 7 is a fermat spiral stream pipe Valveless piezoelectric pump pump loam cake plan view;
Fig. 8 is a fermat spiral stream pipe Valveless piezoelectric pump pump loam cake B-B sectional view;
Fig. 9 is first embodiment's a fermat spiral stream pipe Valveless piezoelectric pump pump lower cover plan view;
Figure 10 is second embodiment's a fermat spiral stream pipe Valveless piezoelectric pump pump lower cover plan view;
Figure 11 is a fermat spiral stream pipe Valveless piezoelectric pump pump lower cover C-C sectional view;
Figure 12 is the piezoelectric vibrator schematic representation.
Embodiment
Embodiment one:
Like Fig. 3, Fig. 6 and shown in Figure 9, the fermat spiral of present embodiment stream pipe Valveless piezoelectric pump comprises the pump housing of being made up of loam cake that is tightly connected 2 and lower cover 31, is provided with the pump chamber 5 that accommodates piezoelectric vibrator 4 between loam cake 2 and the lower cover 3; Also comprise one first fermat spiral stream pipe 6 and first DC tube 7 between loam cake 2 and the lower cover 3; Described first fermat spiral stream pipe 6 one ends are connected with fluid inlet 11 on being arranged on the pump housing 1, and the other end passes through second DC tube 61 and is connected with pump chamber 5; Described first DC tube, 7 one ends are connected with pump chamber 5, and the other end is connected with fluid output 12 on being arranged on the pump housing 1; First fermat spiral stream pipe 6, first DC tube 7 and second DC tube 61 all are arranged on the lower cover 3.Loam cake 2 uses 8 bolts (nut) 9 to link together with lower cover 3 through bolt hole on every side 10.
As shown in Figure 9, described first fermat spiral stream pipe 6 be with fluid inlet 11 be the starting point dextrorotation to the stream pipe, terminal point is the tie point with second DC tube 61.
In the present embodiment, described fluid inlet 11 and fluid output 12 are arranged on the both sides of pump chamber 5, and fluid inlet 11, first fermat spiral stream pipe 6, pump chamber 5, first DC tube 7 and fluid output 12 form the passage that fluids flow.
Like Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9 and shown in Figure 11; Described pump chamber 5 cross sections are rounded; Comprise and be positioned at lower cover 3 and opening first groove 31 towards loam cake 2; And being positioned at loam cake 2 and opening second groove 21 towards first groove 31, first, second slot opening size is identical, constitutes cavity with piezoelectric vibrator 4.Described second groove, 21 edge designs become stair-stepping through hole, and piezoelectric vibrator 4 is bonded and fixed in second groove 21.
In the present embodiment, use one-sided type piezoelectric vibrator.Circular vibrating reed shown in figure 12, that piezoelectric vibrator 4 is generally pasted by the piezoelectric ceramic 41 of circle and tinsel 42.
In order to prevent the joint seepage, can evenly be coated with silica gel in the joint of parts and seal.
Embodiment two:
As shown in Figure 4; The main structure of present embodiment and embodiment one are basic identical; Different is to contain two fermat spiral stream pipes in the present embodiment, and promptly first fermat spiral stream pipe, 6 and second fermat spiral stream pipe, 8, two stream pipes are that symmetry axis is symmetrical with pump chamber 5 center lines.
Shown in figure 10, described first fermat spiral stream pipe 6 is a starting point with fluid inlet 11, is terminal point with the tie point that links to each other with second DC tube 61, integral body be dextrorotation to; Described second fermat spiral stream pipe 8 is a starting point with fluid output 12, is terminal point with the tie point that is connected with first DC tube 7, and integral body is counterclockwise side's rotation direction.
Claims (9)
1. a fermat spiral stream is managed Valveless piezoelectric pump; Comprise the pump housing of forming by loam cake that is tightly connected (2) and lower cover (3) (1); Be provided with the pump chamber (5) that accommodates piezoelectric vibrator (4) between loam cake (1) and the lower cover (2), it is characterized in that, pump chamber (5) is provided with first fermat spiral stream pipe (6) and first DC tube (7); Described first fermat spiral stream pipe (6) one ends are connected with pump chamber (5); The other end is connected with fluid inlet (11), and described first DC tube (7) one ends are connected with pump chamber (5), and the other end is connected with fluid output (12).
2. according to right 1 described fermat spiral stream pipe Valveless piezoelectric pump, it is characterized in that described first fermat spiral stream pipe (6) is connected with pump chamber (5) through second DC tube (61).
3. according to right 1 or 2 described fermat spiral stream pipe Valveless piezoelectric pumps, it is characterized in that described first DC tube (7) is connected with fluid output (12) through second fermat spiral stream pipe (8).
4. according to the described fermat spiral stream of right 1 pipe Valveless piezoelectric pump, it is characterized in that, described first fermat spiral stream pipe (6) be with fluid inlet (11) be the starting point dextrorotation to the stream pipe.
5. according to right 3 described fermat spiral stream pipe Valveless piezoelectric pumps, it is characterized in that said second fermat spiral stream pipe (8) is to be the stream pipe of the counterclockwise rotation direction of starting point with fluid output (12).
6. fermat spiral according to claim 1 stream pipe Valveless piezoelectric pump is characterized in that, described pump chamber (5) be arranged on that lower cover (3) is gone up and opening towards loam cake (2).
7. fermat spiral stream pipe Valveless piezoelectric pump according to claim 1; It is characterized in that; Described pump chamber (5) is made up of second groove (21) sealing that is arranged on first groove (31) on the lower cover (3) and be arranged on the loam cake (2), and described piezoelectric vibrator (4) is arranged in second groove (21).
8. fermat spiral stream pipe Valveless piezoelectric pump according to claim 1 is characterized in that described pump chamber (5) cross section is rounded.
9. according to claim 1 and 2 described fermat spiral stream pipe Valveless piezoelectric pumps; It is characterized in that described first fermat spiral stream pipe (6), second fermat spiral stream pipe (8), first DC tube (61), second DC tube (7) and first groove (31) all directly carve on lower cover (3).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110167544A CN102330662A (en) | 2011-06-21 | 2011-06-21 | Fermat spiral flow pipe valveless piezoelectric pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110167544A CN102330662A (en) | 2011-06-21 | 2011-06-21 | Fermat spiral flow pipe valveless piezoelectric pump |
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| CN102330662A true CN102330662A (en) | 2012-01-25 |
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| CN201110167544A Pending CN102330662A (en) | 2011-06-21 | 2011-06-21 | Fermat spiral flow pipe valveless piezoelectric pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629089A (en) * | 2013-11-11 | 2014-03-12 | 江苏大学 | Hyperbolic helical-tube valveless piezoelectric pump |
| CN103758734A (en) * | 2013-11-11 | 2014-04-30 | 江苏大学 | Fermat solenoid valveless piezoelectric pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1323925A2 (en) * | 2001-12-25 | 2003-07-02 | Matsushita Electric Works, Ltd. | Electroactive polymer actuator and diaphragm pump using the same |
| JP2006204100A (en) * | 2006-04-24 | 2006-08-03 | Matsushita Electric Works Ltd | Manufacturing method of electrostriction polymer actuator |
| CN101975154A (en) * | 2010-10-12 | 2011-02-16 | 江苏大学 | Valve-free piezoelectric pump of logarithmic spiral combined tube |
| CN202149010U (en) * | 2011-06-21 | 2012-02-22 | 无锡长辉机电科技有限公司 | Valvless piezoelectric pump employing fermat helical flow pipe |
-
2011
- 2011-06-21 CN CN201110167544A patent/CN102330662A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1323925A2 (en) * | 2001-12-25 | 2003-07-02 | Matsushita Electric Works, Ltd. | Electroactive polymer actuator and diaphragm pump using the same |
| JP2006204100A (en) * | 2006-04-24 | 2006-08-03 | Matsushita Electric Works Ltd | Manufacturing method of electrostriction polymer actuator |
| CN101975154A (en) * | 2010-10-12 | 2011-02-16 | 江苏大学 | Valve-free piezoelectric pump of logarithmic spiral combined tube |
| CN202149010U (en) * | 2011-06-21 | 2012-02-22 | 无锡长辉机电科技有限公司 | Valvless piezoelectric pump employing fermat helical flow pipe |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629089A (en) * | 2013-11-11 | 2014-03-12 | 江苏大学 | Hyperbolic helical-tube valveless piezoelectric pump |
| CN103758734A (en) * | 2013-11-11 | 2014-04-30 | 江苏大学 | Fermat solenoid valveless piezoelectric pump |
| CN103758734B (en) * | 2013-11-11 | 2016-01-20 | 江苏大学 | A kind of fermat spiral pipe Valveless piezoelectric pump |
| CN103629089B (en) * | 2013-11-11 | 2016-03-02 | 江苏大学 | A kind of hyperbolic helical-tube Valveless piezoelectric pump |
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Application publication date: 20120125 |