CN108757408B - Valveless piezoelectric pump - Google Patents
Valveless piezoelectric pump Download PDFInfo
- Publication number
- CN108757408B CN108757408B CN201810695363.XA CN201810695363A CN108757408B CN 108757408 B CN108757408 B CN 108757408B CN 201810695363 A CN201810695363 A CN 201810695363A CN 108757408 B CN108757408 B CN 108757408B
- Authority
- CN
- China
- Prior art keywords
- elastic
- round platform
- fluid
- shell
- pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000012530 fluid Substances 0.000 claims abstract description 127
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims abstract description 15
- 235000017491 Bambusa tulda Nutrition 0.000 claims abstract description 15
- 241001330002 Bambuseae Species 0.000 claims abstract description 15
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims abstract description 15
- 239000011425 bamboo Substances 0.000 claims abstract description 15
- 239000004429 Calibre Substances 0.000 claims abstract description 7
- 229920002379 silicone rubber Polymers 0.000 claims description 8
- 239000000565 sealant Substances 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 claims description 2
- 238000005086 pumping Methods 0.000 abstract description 11
- 239000010408 film Substances 0.000 description 22
- 230000000694 effects Effects 0.000 description 8
- 239000000463 material Substances 0.000 description 6
- 229910052451 lead zirconate titanate Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000004945 silicone rubber Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000006355 external stress Effects 0.000 description 1
- 230000003116 impacting effect Effects 0.000 description 1
- 150000002484 inorganic compounds Chemical class 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- HFGPZNIAWCZYJU-UHFFFAOYSA-N lead zirconate titanate Chemical compound [O-2].[O-2].[O-2].[O-2].[O-2].[Ti+4].[Zr+4].[Pb+2] HFGPZNIAWCZYJU-UHFFFAOYSA-N 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Abstract
The invention provides a valveless piezoelectric pump which comprises an elastic shell, a piezoelectric film layer, an alternating current power supply and an elastic poking piece group, wherein the elastic shell is provided with a hollow pump cavity, the piezoelectric film layer is attached to the inner wall of the elastic shell, and the piezoelectric film is electrically connected with the alternating current power supply; the pump chamber both sides are connected with respectively and are linked together the flow mouth rather than, two the flow mouth all is provided with elasticity plectrum group, elasticity plectrum group includes the round platform section of thick bamboo that a plurality of elasticity plectrum units formed, each elasticity plectrum unit array is located the outer wall of round platform section of thick bamboo, the inside cavity of round platform section of thick bamboo is in order for fluid to flow through, the round platform section of thick bamboo includes small-bore end and heavy-calibre end, and two the small-bore end orientation of round platform section of thick bamboo is the same. The valveless piezoelectric pump adopting the technical scheme of the invention has high pumping efficiency, can realize macroscopic unidirectional flow of fluid, has flexibility and has wider application field.
Description
Technical Field
The invention relates to the technical field of piezoelectric pumps, in particular to a valveless piezoelectric pump.
Background
Compared with the traditional pump, the piezoelectric pump has the advantages of simple structure, small volume, light weight, low energy consumption, no noise, no electromagnetic interference, capability of accurately controlling key parameters such as fluid flow, flow speed and the like, and is focused by vast researchers at home and abroad. At present, the method has more application in the fields of aerospace, biomedical treatment, machinery, household appliances, micro-chemical mixing, microelectronic cooling and the like.
The pumping motive force of the piezoelectric pump is derived from deformation generated by the inverse piezoelectric effect of the piezoelectric vibrator. Piezoelectric pumps are various, but piezoelectric pumps are classified into valved piezoelectric pumps and valveless piezoelectric pumps from the presence or absence of a valve plate. In general, valveless piezoelectric pumps have a relatively simple structure, and most of the piezoelectric pumps are usually designed to start from a flow channel structure of a flow inlet and outlet pipe, and in the period of periodical change of the volume of a pump cavity, fluid can form macroscopic unidirectional flow due to different flow resistance coefficients of the flow inlet and outlet pipe. In the prior art, the runner can be arranged into various structures, and simply, for example, a conical runner is similar to a branch-shaped runner, and in addition, the runner is designed into a spiral shape, and the effect principle is as follows: the flow resistance of the fluid in the forward and reverse directions is different under the action of the earth coriolis force.
However, the scheme of changing the flow channel arrangement in the prior art has poor turbulence effect, the turbulence rate of the fluid is low when the fluid passes through the flow channel, only a preliminary fluid unidirectional flow effect on a macroscopic scale is realized, and the pumping efficiency of the fluid in the piezoelectric pump is low; in addition, the pump body in the prior art is generally provided with a piezoelectric plate in the pump cavity of the rigid pump body, so that fluid periodically flows into the pump cavity and flows out of the pump cavity, but the rigid piezoelectric pump has the limitation, and cannot be applied to occasions requiring the pump body or the whole structure to show flexibility, such as implanting the piezoelectric pump into a living body.
Disclosure of Invention
The invention aims to provide a valveless piezoelectric pump which has high pumping efficiency, can realize macroscopic unidirectional flow of fluid, has flexibility and has wider application field.
Based on the above, the invention provides a valveless piezoelectric pump, which comprises an elastic shell, a piezoelectric film layer, an alternating current power supply and an elastic plectrum group, wherein the elastic shell is provided with a hollow pump cavity, the piezoelectric film layer is attached to the inner wall of the elastic shell, and the piezoelectric film is electrically connected with the alternating current power supply; the pump chamber both sides are connected with respectively and are linked together the flow mouth rather than, two the flow mouth all is provided with elasticity plectrum group, elasticity plectrum group includes the round platform section of thick bamboo that a plurality of elasticity plectrum units formed, each elasticity plectrum unit array is located the outer wall of round platform section of thick bamboo, the inside cavity of round platform section of thick bamboo is in order for fluid to flow through, the round platform section of thick bamboo includes small-bore end and heavy-calibre end, and two the small-bore end orientation of round platform section of thick bamboo is the same.
As a preferable scheme, each elastic plectrum unit is an arc elastic plectrum unit, and each arc elastic plectrum unit is bent towards the central axis of the round platform barrel.
As the preferred scheme, still include the mounting, the middle part of mounting be provided with the first through-hole that the pump chamber is linked together, the mounting scarf joint in the flow nozzle, the afterbody of elasticity plectrum group is provided with the connecting cylinder, the one end of connecting cylinder with the heavy-calibre end of round platform section of thick bamboo is connected, the connecting cylinder passes through the mounting and flow nozzle inner wall looks joint.
Preferably, the connecting cylinder is provided with a protrusion, the inner wall of the spout is provided with a clamping groove, and the connecting cylinder is clamped with the clamping groove through the protrusion.
As a preferred scheme, the elastic shell comprises an outer shell and an inner shell, the outer shell, the piezoelectric film layer and the inner shell are sequentially laminated, opposite electrodes are arranged on the inner side and the outer side of the piezoelectric film layer, the two electrodes of the piezoelectric film layer are respectively electrically connected with the alternating current power supply through wires, and the outer shell and the inner shell are elastic insulating layers.
Preferably, the outer shell and the inner shell are made of silicone rubber.
Preferably, the elastic shell is an ellipsoidal elastic shell, and the cross section of the pump cavity is elliptical.
Preferably, the two spouts are respectively positioned at the end points of the long axis of the ellipsoidal elastic shell.
As a preferable scheme, two sides of the elastic shell are provided with second through holes communicated with the pump cavity, each flow nozzle is installed in the second through holes in an interference mode, and soft anti-corrosion sealant is arranged at the joint of the flow nozzle and the elastic shell.
When fluid flows to the large-caliber end along the small-caliber end of the circular truncated cone, the small-caliber end of the circular truncated cone forms a small-envelope circle, the outer edge of the small-envelope circle forms an included angle theta with the central axis of the circular truncated cone, and the included angle theta ranges from 30 degrees to 60 degrees.
The embodiment of the invention has the following beneficial effects:
1. The pump body with changeable elasticity enables the pump body structure to be flexible, so that the piezoelectric pump has wider application fields, such as implanting the piezoelectric pump into a living body; the elastic plectrum group comprises a round platform cylinder formed by a plurality of elastic plectrum units, the round platform cylinder comprises a small-caliber end and a large-caliber end, when fluid flows from the large-caliber end to the small-caliber end in the round platform cylinder, the fluid impacts the elastic plectrum unit to expand the small-caliber end of the round platform cylinder, and more fluid passes in unit time and small flow resistance are realized, so that the fluid can flow conveniently; when the fluid flows along the small-caliber end to the large-caliber end, the fluid positioned on the outer side of the round platform cylinder contracts the small-caliber end of the round platform cylinder, so that the fluid passing through the round platform cylinder in unit time is less, and the flow resistance is large, so that the fluid is not beneficial to flowing through the round platform cylinder; based on the structure, in one working period, the two flow nozzles positioned at two sides of the pump cavity are respectively marked as a first flow nozzle and a second flow nozzle, at the moment, the first flow nozzle has more fluid flowing in, less fluid flowing out, and the second flow nozzle has more fluid flowing out, so that the fluid macroscopically flows out along the direction from the second flow nozzle to the first flow nozzle in the whole period, and macroscopic unidirectional flow of the fluid is realized; in addition, compared with the prior art, the elastic plectrum group presents three-dimensional structure, and the vortex rate of the elastic plectrum group of above-mentioned structure to fluid is high, and in a duty cycle, there is more fluid entering to the pump chamber when pump chamber volume diminishes, and there is more fluid outflow pump chamber when pump chamber volume enlarges to make the fluid that pumps of whole cycle more, this piezoelectric pump can pump more fluid promptly in a duty cycle, and then improved piezoelectric pump's pumping efficiency.
2. Each elastic poking piece unit is an arc-shaped elastic poking piece unit, and each arc-shaped elastic poking piece unit is bent towards the central axis of the round platform barrel, so that the bending effect of each arc-shaped elastic poking piece unit is better under fluid impact, the arc-shaped elastic poking piece unit can recover faster when losing fluid impact, and meanwhile, the outer wall of the arc-shaped elastic poking piece unit has a buffer effect on fluid, so that the stability of fluid flow is improved.
3. The piezoelectric pump further comprises a fixing piece, a first through hole communicated with the pump cavity is formed in the middle of the fixing piece, the fixing piece is embedded in the flow nozzle, the tail of the elastic shifting piece group is provided with a connecting cylinder, one end of the connecting cylinder is connected with the large-caliber end of the round platform cylinder, the connecting cylinder is clamped with the inner wall of the flow nozzle through the fixing piece, the connecting cylinder arranged at the tail of the elastic shifting piece group is more stable to install and is installed in the flow nozzle through the connecting piece, and therefore the structure is more convenient to assemble, disassemble and maintain.
4. The connecting cylinder is provided with the arch, and the inner wall of flow nozzle is provided with the draw-in groove, and the connecting cylinder passes through protruding and looks joint of draw-in groove, and the cooperation structure of arch and draw-in groove makes elasticity plectrum group install in the flow nozzle steadily firmly.
5. The elastic shell comprises an outer shell and an inner shell, the outer shell, the piezoelectric film layer and the inner shell are sequentially laminated, opposite electrodes are arranged on the inner side and the outer side of the piezoelectric film layer, the two electrodes of the piezoelectric film layer are respectively electrically connected with an alternating current power supply through wires, the outer shell and the inner shell are elastic insulating layers, the piezoelectric film layer is arranged between the outer shell and the inner shell of the elastic shell, deformation of the piezoelectric film layer can enable the whole elastic shell to be deformed, the outer shell and the inner shell are insulating layers, and therefore the whole piezoelectric pump is of an insulating structure and in a pump cavity, and accordingly the piezoelectric pump can be implanted into a living body and can be guaranteed to stably run.
6. The outer shell and the inner shell are made of silicon rubber, the silicon rubber has insulativity and good elasticity, and the silicon rubber also has the outstanding characteristics of physiological inertia and no coagulation, so that the piezoelectric pump is widely applied in the medical field and is beneficial to being implanted into organisms.
Drawings
FIG. 1 is a schematic diagram of a valveless piezoelectric pump according to an embodiment of the present invention.
Fig. 2 is a cross-sectional view of a valveless piezoelectric pump according to an embodiment of the present invention.
Fig. 3 is a schematic structural view of a nozzle and a fixing member according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of an elastic plectrum group when a fluid flows along a large caliber end to a small caliber end in an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an elastic plectrum group when a fluid flows along a small-caliber end to a large-caliber end in an embodiment of the present invention.
In the figure: 1-elastic shell, 2-piezoelectric film layer, 3-AC power supply, 4-elastic plectrum group, 5-flow nozzle, 6-fixing piece and 7-pump cavity; 11-outer shell, 12-inner shell, 401-round platform cylinder, 402-connecting cylinder, 403-bulge, 41-first elastic plectrum group, 42-second elastic plectrum group, 51-first spout, 52-second spout; 401 a-small caliber end, 401 b-large caliber end.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the terms "first," "second," and the like are used herein to describe various information, but such information should not be limited to these terms, which are used merely to distinguish one type of information from another. For example, a "first" message may also be referred to as a "second" message, and similarly, a "second" message may also be referred to as a "first" message, without departing from the scope of the invention.
It should be noted that the arrows in the drawings in this embodiment point to the flow direction of the fluid.
As shown in fig. 1 to 5, the present embodiment provides a valveless piezoelectric pump, which comprises an elastic casing 1, a piezoelectric film layer 2, an ac power supply 3 and an elastic pulling piece set 4, wherein the elastic casing 1 is provided with a hollow pump cavity 7, the piezoelectric film layer 2 is attached to the inner wall of the elastic casing 1, and is electrically connected with the ac power supply 3, when the ac power supply 3 increases the periodic variation voltage for the piezoelectric film, the piezoelectric film layer 2 is periodically deformed so as to deform the whole elastic casing 1, thereby periodically varying the volume of the pump cavity 7, and it should be noted that the piezoelectric film layer 1 in the present embodiment is made of a flexible piezoelectric material, Specifically, for example, lead zirconate titanate is an inorganic compound, is a piezoelectric material, has a chemical formula of Pb [ Zr xTi1－x]O3, wherein (0 is less than or equal to x is less than or equal to 1), is also called PZT, is a main material of the current electrostriction actuator, has different PZT performances obtained by different values of x in the chemical formula, is influenced by doped materials, can realize direct conversion of electric energy and mechanical energy, can convert external stress into electric charge and can convert external electric field into strain linearly related to the electric charge, wherein when the Zr/Ti ratio is 52/48 (i.e., x=0.52), the PZT has a dielectric constant of 3000 at this time, and belongs to soft PZT, which can be used as the material of the piezoelectric thin film layer 1 that changes elastically in this example. when the volume of the pump cavity 7 is increased in one period, the fluid outside the pump cavity 7 is pressed into the pump cavity 7 due to the pressure difference, and when the volume of the pump cavity 7 is reduced, the fluid in the pump cavity 7 is pressed out of the pump cavity 7, namely the pump cavity 7 realizes the inflow and outflow process of the fluid in one period, and in addition, the pump body with the elasticity variable enables the pump body structure to present flexibility, so that the piezoelectric pump has wider application field, such as the piezoelectric pump is implanted into a living body; Two sides of the pump cavity 7 are respectively connected with a flow nozzle 5 communicated with the pump cavity, the two flow nozzles 5 are respectively provided with an elastic plectrum group 4, the elastic plectrum group 4 comprises a round platform cylinder 401 formed by a plurality of elastic plectrum units, each elastic plectrum unit array is arranged on the outer wall of the round platform cylinder 401, the inside of the round platform cylinder 401 is hollow for fluid to flow through, the round platform cylinder 401 comprises a small-caliber end 401a and a large-caliber end 401b, when the fluid flows from the large-caliber end 401b to the small-caliber end 401a in the round platform cylinder 401, as shown in figure 5, the fluid impacts the elastic plectrum units to expand the small-caliber end 401a of the round platform cylinder 401, the fluid passing in unit time is more, the flow resistance is small, and thus the fluid can flow conveniently; As shown in fig. 4, when the fluid flows along the small-caliber end 401a to the large-caliber end 401b, the fluid outside the circular cylinder 401 causes the small-caliber end 401a of the circular cylinder 401 to shrink, so that the fluid passing through per unit time is less, and the flow resistance is large, which is unfavorable for the fluid to flow through; and the small caliber ends 401a of the two circular truncated cones 401 face the same direction. In the present embodiment, two flow nozzles 5 located at both sides of the pump chamber 7 are respectively denoted as a first flow nozzle 51 and a second flow nozzle 52, while the elastic paddle set 4 corresponding to the first flow nozzle 51 is denoted as a first elastic paddle set 4, the small-caliber end 401a of the first elastic paddle set 4 is disposed away from the pump chamber 7, the elastic paddle set 4 corresponding to the second flow nozzle 52 is denoted as a second elastic paddle set 4, the small-caliber end 401a of the second elastic paddle set 4 is disposed toward the pump chamber 7, and in one working cycle, when the volume of the pump chamber 7 becomes large, external fluid enters the pump chamber 7 from the first flow nozzle 51 and the second flow nozzle 52, and when the fluid flows into the pump chamber 7 from the first flow nozzle 51, Since the small-caliber end 401a of the first elastic pulling piece set 4 is far away from the pump cavity 7, that is, the fluid flows along the small-caliber end 401a to the large-caliber end 401b, the fluid outside the circular truncated cone 401 causes the small-caliber end 401a of the circular truncated cone 401 to shrink, and when the fluid flows into the pump cavity 7 from the second flow nozzle 52, the small-caliber end 401a of the second elastic pulling piece set 4 is arranged toward the pump cavity 7, that is, the fluid flows from the large-caliber end 401b to the small-caliber end 401a in the circular truncated cone 401, and accordingly, when the volume of the pump cavity 7 becomes smaller, the fluid flows out from the pump cavity 7 along the first flow nozzle 51 and the second flow nozzle 52, At this time, the fluid flowing out along the first spout 51 is large per unit time, and the fluid flowing out along the second spout 52 is small per unit time. In summary, in one working cycle, the second spout 52 has more fluid flowing in, less fluid flowing out, the first spout 51 has more fluid flowing out, and less fluid flowing in, so that the fluid macroscopically flows out along the direction from the second spout 52 to the first spout 51 in the whole cycle, thereby realizing macroscopic unidirectional flow of the fluid. Meanwhile, as the elastic plectrum group 4 presents a three-dimensional structure, compared with a two-dimensional flow channel in the prior art, the turbulence rate of the elastic plectrum group 4 with the structure on fluid is high, in one working cycle, more fluid enters the pump cavity 7 when the volume of the pump cavity 7 is reduced, and more fluid flows out of the pump cavity 7 when the volume of the pump cavity 7 is increased, so that more fluid is pumped in the whole cycle, namely more fluid can be pumped by the piezoelectric pump in one working cycle, and the pumping efficiency of the piezoelectric pump is improved. In the prior art, a two-dimensional flow channel design is often adopted on the flow inlet and outlet pipe, only macroscopic fluid unidirectional flow is realized, the turbulence rate of the fluid is low when the fluid passes through the flow channel, and the flow resistance of the flow channel with a two-dimensional structure is small, so that the fluid difference value of the piezoelectric pump for entering and exiting the pump cavity 7 in unit time is small, and the pumping efficiency of the piezoelectric pump is low. It should be noted that the arrangement form of the first elastic paddle set 4 in the first nozzle 51 and the second elastic paddle set 4 in the second nozzle 52 should not be limited to the present embodiment only as long as the alignment of the first elastic paddle set 4 and the second elastic paddle set 4 is ensured.
Based on the technical scheme, the pump body with the changeable elasticity enables the pump body structure to be flexible, so that the piezoelectric pump has wider application fields, such as implanting the piezoelectric pump into a living body; the elastic plectrum group 4 comprises a round platform cylinder 401 formed by a plurality of elastic plectrum units, the round platform cylinder 401 comprises a small-caliber end 401a and a large-caliber end 401b, when fluid flows from the large-caliber end 401b to the small-caliber end 401a in the round platform cylinder 401, the fluid impacts the elastic plectrum units to expand the small-caliber end 401a of the round platform cylinder 401, more fluid passes in unit time, and the flow resistance is small, so that the fluid can flow conveniently; when the fluid flows along the small-caliber end 401a to the large-caliber end 401b, the fluid positioned outside the circular cylinder 401 causes the small-caliber end 401a of the circular cylinder 401 to shrink, the fluid passing through per unit time is less, and the flow resistance is large, so that the fluid is not favorable for flowing through; based on the structure, in one working cycle, the two flow nozzles 5 positioned at two sides of the pump cavity 7 are respectively marked as a first flow nozzle 51 and a second flow nozzle 52, at the moment, the first flow nozzle 51 has more fluid, less fluid flows out, the second flow nozzle 52 has more fluid and less fluid flows in, and thus the fluid macroscopically flows out along the direction from the second flow nozzle 52 to the first flow nozzle 51 in the whole cycle; in addition, compared with the prior art, the elastic poking plate group 4 has a three-dimensional structure, the turbulence rate of the elastic poking plate group 4 with the structure on fluid is high, in one working period, more fluid enters the pump cavity 7 when the volume of the pump cavity 7 is reduced, and more fluid flows out of the pump cavity 7 when the volume of the pump cavity 7 is increased, so that more fluid is pumped in the whole period, namely, more fluid can be pumped by the piezoelectric pump in one working period, and the pumping efficiency of the piezoelectric pump is improved.
In this embodiment, each elastic paddle unit is an arc-shaped elastic paddle unit, and each arc-shaped elastic paddle unit is bent towards the central axis of the circular truncated cone 401, so that the bending effect of each arc-shaped elastic paddle unit is better under the impact of fluid, and the arc-shaped elastic paddle unit can recover faster when the impact of fluid is lost, and meanwhile, the outer wall of the arc-shaped elastic paddle unit has a buffer effect on the fluid, so that the stability of fluid flow is improved.
The piezoelectric pump further comprises a fixing piece 6, in this embodiment, the fixing piece 6 is a fixing sleeve, a first through hole communicated with the pump cavity 7 is formed in the middle of the fixing piece 6, the fixing piece 6 is embedded in the spout 5, a connecting cylinder 402 is arranged at the tail of the elastic plectrum group 4, one end of the connecting cylinder 402 is connected with a large-caliber end 401b of the round platform cylinder 401, the connecting cylinder 402 is clamped with the inner wall of the spout 5 through the fixing piece 6, the connecting cylinder 402 arranged at the tail of the elastic plectrum group 4 is more stable to install and is arranged in the spout 5 through the connecting piece, so that the structure is more convenient to assemble, disassemble and maintain, and particularly, a plurality of elastic plectrum unit arrays form a round platform cylinder 401 structure, the large-caliber end 401b of the round platform cylinder 401 is provided with a connecting ring, therefore, all elastic plectrum units are connected into a whole, the connecting cylinder 402 is connected with the large-caliber end 401b of the round platform cylinder 401, and the elastic plectrum group 4 is further connected with the large-caliber end 401b of the round platform cylinder 401 to form an elastic plectrum group 4.
Preferably, the connecting cylinder 402 is provided with a protrusion 403, the inner wall of the spout 5 is provided with a clamping groove, the connecting cylinder 402 is clamped with the clamping groove through the protrusion 403, and the elastic poking piece group 4 is stably and firmly installed in the spout 5 due to the matching structure of the protrusion 403 and the clamping groove.
In addition, the elastic shell 1 comprises an outer shell 11 and an inner shell 12, the outer shell 11, the piezoelectric film layer 2 and the inner shell 12 are sequentially laminated, opposite electrodes are arranged on the inner side and the outer side of the piezoelectric film layer 2, the two electrodes of the piezoelectric film layer 2 are respectively electrically connected with the alternating current power supply 3 through leads, the outer shell 11 and the inner shell 12 are elastic insulating layers, the piezoelectric film layer 2 is arranged between the outer shell 11 and the inner shell 12 of the elastic shell 1, the deformation of the piezoelectric film layer 2 can enable the whole elastic shell 1 to deform, and the outer shell 11 and the inner shell 12 are insulating layers, so that the whole piezoelectric pump is of an insulating structure and can be implanted into a living body, and stable operation can be ensured. Further, the materials of the outer shell 11 and the inner shell 12 are silicone rubber, the silicone rubber has insulativity and good elasticity, and the silicone rubber also has the outstanding characteristics of physiological inertia and no coagulation, so that the piezoelectric pump is widely applied in the medical field and is beneficial to being implanted into a living body.
Preferably, the elastic housing 1 is an ellipsoidal elastic housing 1, and the cross section of the pump cavity 7 is elliptical, the structure of the ellipsoidal elastic housing 1 makes the outer wall of the piezoelectric pump smooth, and the cross section of the pump cavity 7 is elliptical, so that the capacity of the pump cavity 7 is ensured to be large, and when fluid enters the pump cavity 7, the fluid has a buffering effect after impacting on the inner wall of the ellipse, so that the pumping of the fluid is more stable. Furthermore, the two flow nozzles 5 are respectively located at the end points of the long axis of the ellipsoidal elastic housing 1, on the basis of which the distance between the two flow nozzles 5 is maximized in the structure, so that the fluid does not interfere with each other when flowing in and out of the two flow nozzles 5, thereby making the pumping of the fluid in the piezoelectric pump more stable.
Specifically, the both sides of elastic housing 1 be provided with the second through-hole that pump chamber 7 is linked together, each runner 5 interference install in the second through-hole, just runner 5 with the junction of elastic housing 1 is provided with soft anticorrosion sealant, and runner 5 of interference installation makes its mounting structure more firm stable, and soft anticorrosion sealant makes the leakproofness of runner 5 good, guarantees that the fluid is by runner 5 business turn over pump chamber 7, guarantees the structural stability of this piezoelectric pump.
In this embodiment, when the fluid flows along the small-caliber end 401a of the circular truncated cone 401 toward the large-caliber end 401b, the small-caliber end 401a of the circular truncated cone 401 forms a small-envelope circle, the outer edge of the small-envelope circle forms an included angle θ with the central axis of the circular truncated cone 401, the value range of the included angle θ is 30 ° -60 °, the greater the value of the included angle, the greater the obstruction of the elastic plectrum group 4 to the fluid, that is, the less fluid will flow in unit time, whereas the smaller the included angle, the smaller the obstruction to the fluid, but when the included angle is too small, the irreversible deformation of the elastic plectrum unit is easily caused, thereby making the elastic plectrum group 4 unable to work normally. So the above-mentioned contained angle setting can guarantee the stable runner of fluid, and guarantee that each elasticity plectrum unit can multiple expansion and shrink, extension elasticity plectrum group 4's life. It should be noted that, in the present embodiment, in the circular truncated cone 401 structure, the ratio between the cross-sectional area of the small caliber end 401a and the cross-sectional area of the large caliber end 401b is in the range of 1/2-2/3, and based on the above ratio, the stable operation of the elastic plectrum group 4 can be ensured.
By adopting the valveless piezoelectric pump provided by the embodiment of the invention, the pump body with the elasticity variable enables the pump body structure to be flexible, so that the piezoelectric pump has wider application fields, such as implanting the piezoelectric pump into a living body; the elastic plectrum group 4 comprises a round platform cylinder 401 formed by a plurality of elastic plectrum units, the round platform cylinder 401 comprises a small-caliber end 401a and a large-caliber end 401b, when fluid flows from the large-caliber end 401b to the small-caliber end 401a in the round platform cylinder 401, the fluid impacts the elastic plectrum units to expand the small-caliber end 401a of the round platform cylinder 401, more fluid passes in unit time, and the flow resistance is small, so that the fluid can flow conveniently; when the fluid flows along the small-caliber end 401a to the large-caliber end 401b, the fluid positioned outside the circular cylinder 401 causes the small-caliber end 401a of the circular cylinder 401 to shrink, the fluid passing through per unit time is less, and the flow resistance is large, so that the fluid is not favorable for flowing through; based on the structure, in one working cycle, the two flow nozzles 5 positioned at two sides of the pump cavity 7 are respectively marked as a first flow nozzle 51 and a second flow nozzle 52, at the moment, the first flow nozzle 51 has more fluid, less fluid flows out, the second flow nozzle 52 has more fluid and less fluid flows in, and thus the fluid macroscopically flows out along the direction from the second flow nozzle 52 to the first flow nozzle 51 in the whole cycle; in addition, compared with the prior art, the elastic poking plate group 4 has a three-dimensional structure, the turbulence rate of the elastic poking plate group 4 with the structure on fluid is high, in one working period, more fluid enters the pump cavity 7 when the volume of the pump cavity 7 is reduced, and more fluid flows out of the pump cavity 7 when the volume of the pump cavity 7 is increased, so that more fluid is pumped in the whole period, namely, more fluid can be pumped by the piezoelectric pump in one working period, and the pumping efficiency of the piezoelectric pump is improved.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present invention, and these modifications and substitutions should also be considered as being within the scope of the present invention.
Claims (7)
1. A valveless piezoelectric pump, characterized by: the piezoelectric pump comprises an elastic shell, a piezoelectric film layer, an alternating current power supply, a fixing piece and an elastic poking piece group, wherein the elastic shell is provided with a hollow pump cavity, the piezoelectric film layer is attached to the inner wall of the elastic shell, and the piezoelectric film layer is electrically connected with the alternating current power supply; the two sides of the pump cavity are respectively connected with flow nozzles communicated with the pump cavity, the two flow nozzles are respectively provided with an elastic plectrum group, the elastic plectrum groups comprise round platform cylinders formed by a plurality of elastic plectrum units, each elastic plectrum unit array is arranged on the outer wall of the round platform cylinder, each elastic plectrum unit is an arc elastic plectrum unit, each arc elastic plectrum unit bends towards the central axis of the round platform cylinder, the inside of the round platform cylinder is hollow for fluid to flow through, the round platform cylinder comprises a small-caliber end and a large-caliber end, the small-caliber ends of the two round platform cylinders face the same direction, the middle part of mounting be provided with the first through-hole that the pump chamber is linked together, the mounting scarf joint in the flow nozzle, the afterbody of elasticity plectrum group is provided with the connecting cylinder, the one end of connecting cylinder with the heavy-calibre end of round platform section of thick bamboo is connected, the connecting cylinder passes through the mounting with flow nozzle inner wall looks joint, when the fluid flows to the heavy-calibre end along the heavy-calibre end of round platform section of thick bamboo, the heavy-calibre end of round platform section of thick bamboo forms the small envelope circle, the outer edge of small envelope circle with the central axis of round platform section of thick bamboo forms contained angle theta, the range of value of contained angle theta is 30 ~ 60.
2. The valveless piezoelectric pump according to claim 1, wherein: the connecting cylinder is provided with a bulge, the inner wall of the flow nozzle is provided with a clamping groove, and the connecting cylinder is clamped with the clamping groove through the bulge.
3. The valveless piezoelectric pump according to claim 1, wherein: the elastic shell comprises an outer shell and an inner shell, wherein the outer shell, the piezoelectric film layer and the inner shell are sequentially laminated, opposite electrodes are arranged on the inner side and the outer side of the piezoelectric film layer, the two electrodes of the piezoelectric film layer are respectively electrically connected with an alternating current power supply through wires, and the outer shell and the inner shell are elastic insulating layers.
4. A valveless piezoelectric pump according to claim 3, wherein: the outer shell and the inner shell are made of silicon rubber.
5. The valveless piezoelectric pump according to claim 1, wherein: the elastic shell is an ellipsoidal elastic shell, and the cross section of the pump cavity is elliptical.
6. The valveless piezoelectric pump according to claim 5, wherein: the two flow nozzles are respectively positioned at the end points of the long axis of the ellipsoidal elastic shell.
7. Valveless piezoelectric pump according to any one of claims 1 to 6, wherein: the two sides of the elastic shell are provided with second through holes communicated with the pump cavity, the flow nozzles are installed in the second through holes in an interference mode, and soft anti-corrosion sealant is arranged at the joint of the flow nozzles and the elastic shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695363.XA CN108757408B (en) | 2018-06-28 | Valveless piezoelectric pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810695363.XA CN108757408B (en) | 2018-06-28 | Valveless piezoelectric pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108757408A CN108757408A (en) | 2018-11-06 |
| CN108757408B true CN108757408B (en) | 2024-07-12 |
Family
ID=
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10267185A (en) * | 1997-03-25 | 1998-10-09 | Tokai Rubber Ind Ltd | Valve gear built in tubular body |
| CN1924417A (en) * | 2005-08-31 | 2007-03-07 | 北京大学 | Microvalve integrated in flow passage |
| CN106246516A (en) * | 2016-10-10 | 2016-12-21 | 青岛农业大学 | Infundibulate Valveless piezoelectric pump |
| CN106246515A (en) * | 2016-10-05 | 2016-12-21 | 吉林大学 | A kind of bionic pump based on flexible piezoelectric driver |
| CN208364347U (en) * | 2018-06-28 | 2019-01-11 | 广州大学 | A kind of Valveless piezoelectric pump |
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10267185A (en) * | 1997-03-25 | 1998-10-09 | Tokai Rubber Ind Ltd | Valve gear built in tubular body |
| CN1924417A (en) * | 2005-08-31 | 2007-03-07 | 北京大学 | Microvalve integrated in flow passage |
| CN106246515A (en) * | 2016-10-05 | 2016-12-21 | 吉林大学 | A kind of bionic pump based on flexible piezoelectric driver |
| CN106246516A (en) * | 2016-10-10 | 2016-12-21 | 青岛农业大学 | Infundibulate Valveless piezoelectric pump |
| CN208364347U (en) * | 2018-06-28 | 2019-01-11 | 广州大学 | A kind of Valveless piezoelectric pump |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Wax et al. | Electroactive polymer actuators and devices | |
| WO2012104648A1 (en) | Pump | |
| Li et al. | A two-layer linear piezoelectric micromotor | |
| CN105508207B (en) | A kind of cymbal type pump housing piezoelectric pump | |
| CN111828290A (en) | Valveless piezoelectric pump | |
| CN107614875A (en) | Pump | |
| CN108757408B (en) | Valveless piezoelectric pump | |
| CN203272085U (en) | Single-film double-cavity miniature valveless fluid pump driven by IPMC driving film | |
| Zhang et al. | A valveless piezoelectric pump with novel flow path design of function of rectification to improve energy efficiency | |
| CN101435421A (en) | Piezoelectric ceramic pump for implementing fluid flow by centrifugal principle | |
| CN105526135A (en) | Valveless electrostatic micropump with low reverse drive voltage and double-sided pump diaphragms, and preparation method thereof | |
| CN202165255U (en) | Interlocking spiral flow pipe valve-free piezoelectric pump | |
| CN104963834B (en) | Oscillating vibrator of piezoelectric pump | |
| CN108757408A (en) | A kind of Valveless piezoelectric pump | |
| CN101255859B (en) | Subtense wimble structure micro-driver driven by titanium adnic alloy membrana as well as preparing method | |
| CN103644105B (en) | A kind of Archimedes spiral pipe Valveless piezoelectric pump | |
| CN102338066B (en) | Valveless piezoelectric pump with lituus flow pipes | |
| Hwang et al. | Fabrication and characterization of two-chamber and three-chamber peristaltic micropumps | |
| CN221299451U (en) | Piezoelectric liquid pump and electronic equipment | |
| CN109973364B (en) | Liquid pump for micro-cooling system | |
| CN112177902A (en) | Vane type bluff body piezoelectric pump | |
| CN204704094U (en) | A kind of swinging vibrator of piezoelectric pump | |
| RU2782876C1 (en) | Valveless diaphragm microfluidic pump | |
| Liu et al. | A power supply consists of the DC-DC boost converter and a full-bridge inverter circuits for a PZT liquid pump | |
| CN113187702B (en) | Valveless piezoelectric pump and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant |