CN102419246A - Mini-type water drop generator - Google Patents
Mini-type water drop generator Download PDFInfo
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- CN102419246A CN102419246A CN2011102439626A CN201110243962A CN102419246A CN 102419246 A CN102419246 A CN 102419246A CN 2011102439626 A CN2011102439626 A CN 2011102439626A CN 201110243962 A CN201110243962 A CN 201110243962A CN 102419246 A CN102419246 A CN 102419246A
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Abstract
The invention discloses a mini-type water drop generator. The mini-type water drop generator is used for generating one or a plurality of water drops in ice wind channels on the ground and offers help to research deformation, crushing, and changes of temperatures and speeds, impact properties to wings and the like of the water drops in a high-speed movement process. The water drop generator is designed based on a Rayleigh instability principle. The water drop generator provided by the invention comprises a piezoelectric device, a water guide pipe, a middle shell, a precise needle head and the like. Under the functions of providing a pulse signal by a frequency generator, sound pressure waves are generated in a liquid cavity by a first piezoelectric vibrator; single liquid drop injection is generated by the mutual effects of the sound pressure waves and a liquid free meniscus on the outlet of the precise needle head; pressure waves are generated by the mutual effects of flexural vibrations which are generated by a second piezoelectric vibrator, and the liquid, so that the continuous water drops with equal diameters are generated on the outlet of the precise needle head.
Description
Technical field
The present invention relates to be applied to the water droplet generator in the icing tunnel experiment of aerospace field, is exactly the water droplet generator that in the icing tunnel experiment of research droplets impact its behavior, is used to produce miniature water droplet specifically.
Background technology
In the cloud layer, the size of liquid water droplets is very inconsistent, can be made up of several microns the water dust raindrop to a hundreds of micron.The existence of super-cooling waterdrop in the atmosphere is the most important factor that aircraft freezes.The water droplet that we study usually is that diameter is not more than 40 microns little water droplet, and this also is the drop diameter scope that causes that mainly aircraft freezes.The difference of crossing cold big water droplet and little water droplet was that cold big flood drops in the motion process and distortion, fragmentation can occur that when the bump wing, also can occur splashing and rebound phenomena, the icing mechanism of therefore crossing cold big water droplet was comparatively complicated.
Icing tunnel be prevent, the wind-tunnel of deicing experimental study, facing the wind surface and some instrument, the icing form of machine outer sensor part, the tolerance limit of freezing and anti-, the technological special wind-tunnel of deicing of aircraft when being research aircraft flight.The water droplet that obtains the diameter that requires is a committed step of studying cold big water droplet ice producing machine reason in the icing tunnel experiment.
The characteristic parameter that the position that aircraft freezes, scope and the amount of freezing, the shape of freezing etc. have a strong impact on flying quality receives isoparametric influence of velocity magnitude, water droplet size, temperature of super-cooling waterdrop and its relative motion in the atmosphere; Icing tunnel is mainly to be used for the icing ground experiment system of simulated aircraft; What flow in the icing tunnel is the high speed cold air-flow; The super-cooling waterdrop of diameter in the air-flow≤40 micron is produced by nozzle atomization, and is stifled for preventing that jet expansion from freezing, and sprayed by nozzle atomization after often aqueous water need be heated again.
The cold big water droplet of mistake of diameter >=50 micron be accompanied by the caloic exchange in the high speed supercool gas motion process on every side; Parameters such as its size, shape, speed and temperature all change thereupon, and the kinetic parameter of big water droplet and the thermal parameter position that all can freeze to last ice shape with on wing has directly or indirectly and influences.At present; Be applied in the water droplet generator (nozzle) in the icing tunnel because the water droplet of disposable generation is more, and drop diameter is not of uniform size, in the motion process of water droplet, has the uncertain factors such as polymerization, deformation that bump again; Can't accurately obtain the power of water droplet in motion process and the variation of thermal parameter; Therefore, the single or a plurality of water droplets, the parameter of tracking water droplet in motion process that obtain the known diameter size change, and become the committed step of the mechanism experimental study that freezes.
Summary of the invention
The purpose of this invention is to provide a kind of miniature water droplet generator, this water droplet generator produces singly through first piezoelectric vibrator and drips, and more second piezoelectric vibrator produces to drip and drip; This water droplet generator can provide the water droplet of diameter >=50 micron for icing tunnel experiment, offers help for the variation of the deformation in the high-speed motion process of research water droplet, fragmentation, temperature and speed and to the impact characteristics of wing etc.
The present invention is a kind of miniature water droplet generator, and this water droplet generator includes top cover (1), central enclosure (2), bottom (3), first piezoelectric vibrator (4), second piezoelectric vibrator (5), syringe needle anchor clamps (6), syringe needle (6A), aqueduct (6B), O-ring seal (7), sleeve (8); Sleeve (8) is a silica gel material, and O-ring seal (7) is a teflon;
The upper surface of top cover (1) is a polishing plate face (11), and the lower surface of top cover (1) is provided with outer toroid (12), interior round platform (13), is groove (14) between outer toroid (12) and the interior round platform (13); This groove (14) is used to place the boss (24) of central enclosure (2); Outer toroid (12) is provided with C through hole (121), circular trough (122); This C through hole (121) is coaxial with A threaded hole (211), and realizes being connected on top cover (1) and the central enclosure (2) through a screw; This circular trough (122) is used for aqueduct (6B) and passes; Interior round platform (13) is provided with D through hole (131), E through hole (132); D through hole (131) passes with positive electrode (43), negative electrode (44) that E through hole (132) is respectively applied on first piezoelectric vibrator (4);
Central enclosure (2) is provided with stage body (21), following stage body (22), is groove ring (23) between last stage body (21) and the following stage body (22), and last stage body (21) top is provided with boss (24); The center of central enclosure (2) is tapered channel (25), circular channel (26), and tapered channel (25) is in the top of circular channel (26); The end face of last stage body (21) is provided with A threaded hole (211); The face of cylinder of following stage body (22) is provided with A through hole (221), and this A through hole (221) is used to place second piezoelectric vibrator (5); The face of cylinder of boss (24) is provided with B through hole (241), and this B through hole (241) is used to place aqueduct (6B); The inner cylinder face of boss (24) is provided with interior round platform (242), and round platform (242) is used to support first piezoelectric vibrator (4) in this; Circular channel (26) is used to place sleeve (8), and the two ends up and down of sleeve (8) are respectively installed with lasso (8A), following lasso (8B); Tapered channel (25) and circular channel (26) constitute fluid chamber;
The upper surface of bottom (3) is a polishing plate face (31), and the below of bottom (3) is provided with taper round platform (32), and the center of taper round platform (32) is provided with F through hole (321), and this F through hole (321) is used to place little shape syringe needle (6A); The outer rim of bottom (3) is provided with G through hole (311); Be socketed with teflin ring (7) between the following stage body (22) of bottom (3) and central enclosure (2);
First piezoelectric vibrator (4) includes Lithia niobium piezoelectric patches (41) and scale copper (42), positive electrode (43), negative electrode (44) and two teflon upper gasket (4A), lower gaskets (4B) that play fixation; Scale copper (42) is installed between upper gasket (4A) and the lower gasket (4B); Lithia niobium piezoelectric patches (41) bonds together with scale copper (42), and positive electrode (43) is connected on the Lithia niobium piezoelectric patches (41) with negative electrode (44); Lithia niobium piezoelectric patches (41) and scale copper (42), positive electrode (43) and negative electrode (44) the formation piezo electric module that is assembled together; Lower gasket (4B) is installed on the interior round platform (242) of central enclosure (2);
Second piezoelectric vibrator (5) includes identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made up of A piezoelectric patches (51), positive electrode (53), negative electrode (54) and A electrode tip holder (57); A electrode tip holder (57) is provided with two through holes that supply positive electrode (53), negative electrode (54) to pass through; Positive electrode (53) is welded on the end face of A piezoelectric patches (51) with negative electrode (54); The other end of A piezoelectric patches (51) is bonded on the sleeve (8), and positive electrode (53), negative electrode (54) are connected with the frequency generator of outside after passing two through holes on the A electrode tip holder (57) respectively; Right piezo electric module is made up of B piezoelectric patches (52), positive electrode (55), negative electrode (56) and B electrode tip holder (58); B electrode tip holder (58) is provided with two through holes that supply positive electrode (55), negative electrode (56) to pass through; Positive electrode (55) is welded on the end face of B piezoelectric patches (52) with negative electrode (56); The other end of B piezoelectric patches (52) is bonded on the sleeve (8), and A piezoelectric patches (51) is bonded on the sleeve (8) with B piezoelectric patches (52) symmetry; Positive electrode (55), negative electrode (56) are connected with the frequency generator of outside after passing two through holes on the B electrode tip holder (58) respectively; A electrode tip holder (57) is identical with the structure of B electrode tip holder (58), and A piezoelectric patches (51) is identical with B piezoelectric patches (52) structure;
The outside of syringe needle anchor clamps (6) is cylindrical, and the center, top of syringe needle anchor clamps (6) is designed to tapered channel (61), and the below of syringe needle anchor clamps (6) is used to install syringe needle (6A).
The advantage of water droplet generator of the present invention is:
1. adopt the array configuration of first piezoelectric vibrator 4 and second piezoelectric vibrator 5; Through optionally connecting first piezoelectric vibrator 4 and second piezoelectric vibrator 5; Through the voltage magnitude and the frequency of the generator of adjusting frequency, can obtain the miniature water droplet of single or a plurality of necessary requirement diameter then.
2. be installed in the accurate syringe needle 6A on the syringe needle anchor clamps 6 through replacing, can realize diameter adjusting the drop of accurate syringe needle 6A outgoing.
3. the water droplet generator of the present invention's design is convenient to study power and the thermodynamic parameter variation of water droplet in the flow at high speed process.
4. the water droplet generator of the present invention design can be accomplished the generation of single or a plurality of miniature water droplets through the working method of selecting first piezoelectric vibrator 4 and second piezoelectric vibrator 5, and the water droplet generator simple in structure, overall dimensions is less, assembling and easy to operate.
Description of drawings
Fig. 1 is the structural drawing of the miniature water droplet generator of the present invention.
Figure 1A is the structural drawing at another visual angle of the miniature water droplet generator of the present invention.
Figure 1B is a cut-open view that waits of the miniature water droplet generator of the present invention.
Fig. 1 C is the exploded view of the miniature water droplet generator of the present invention.
Fig. 2 is the structural drawing of central enclosure of the present invention.
Fig. 2 A is the front view of central enclosure of the present invention.
Fig. 2 B is the A-A cut-open view of central enclosure of the present invention.
Fig. 3 is the structural drawing of top cover of the present invention.
Fig. 4 is the structural drawing of bottom of the present invention.
Fig. 5 is that the miniature water droplet generator of the present invention is connected synoptic diagram with water storage tank, frequency generator.
1. top cover 11. formation plate faces 12. outer toroid 121.C through holes 122. circular troughs
13. interior round platform 131.D through hole 132.E through hole 14. grooves 2. central enclosure
21. 22. times stage body 221.A of last stage body 211.A threaded hole through hole 222.B threaded hole
23. round platform 25. tapered channels in the groove ring 24. boss 241.B through holes 242.
26. circular channel 3. bottoms 31. formation plate face 311.G through holes 32. taper round platforms
321.F through hole 4. first piezoelectric vibrators 41. piezoelectric patches 42. copper sheets 43. positive electrodes
44. negative electrode 4A. upper gasket 4B. lower gasket 4C.A lead 4D.B lead
5. the second piezoelectric vibrator 51.A piezoelectric patches 52.B piezoelectric patches, 53. positive electrodes, 54. negative electrodes
55. positive electrode 56. negative electrode 57.A electrode tip holder 58.B electrode tip holder 5A.A leads
6C. flexible pipe 7. O-ring seals 8. sleeve 8A. go up lasso under the lasso 8B.
Embodiment
To combine accompanying drawing that the present invention is done further detailed description below.
Shown in Fig. 1, Figure 1A, Figure 1B, Fig. 1 C; A kind of miniature water droplet generator of the present invention, this water droplet generator include top cover 1, central enclosure 2, bottom 3, first piezoelectric vibrator 4, second piezoelectric vibrator 5, syringe needle anchor clamps 6, syringe needle 6A, aqueduct 6B, O-ring seal 7, sleeve 8; Syringe needle 6A is installed in the below of syringe needle anchor clamps 6; Sleeve 8 is installed in the central enclosure 2, and is provided with lasso 8A and following lasso 8B in the sleeve 8.
(1) top cover 1
Referring to Fig. 1, Figure 1A, Figure 1B, Fig. 1 C, shown in Figure 3, the upper surface of top cover 1 is a polishing plate face 11, and the lower surface of top cover 1 is provided with outer toroid 12, interior round platform 13, is groove 14 between outer toroid 12 and the interior round platform 13.
Place the boss 24 of central enclosure 2 in the groove 14, be fastened on the boss 24 between outer toroid 12 and the interior round platform 13, can realize the fitting tight between top cover 1 and central enclosure 2 upper ends.
In the present invention, top cover 1 adopts stainless steel material processing.
(2) central enclosure 2
Shown in Fig. 1, Figure 1A, Figure 1B, Fig. 1 C, Fig. 2, Fig. 2 A, Fig. 2 B, central enclosure 2 is provided with stage body 21, following stage body 22, is groove ring 23 between last stage body 21 and the following stage body 22, and last stage body 21 tops are provided with boss 24; The centre of central enclosure 2 is tapered channel 25, circular channel 26, and tapered channel 25 is above circular channel 26.
The end face of last stage body 21 is provided with A threaded hole 211, this A threaded hole 211 be used for top cover 1 on through hole cooperate, be to realize under the web member being installed together at screw with above top cover 1 and the central enclosure 2.
The face of cylinder of following stage body 22 is provided with A through hole 221, and this A through hole 221 is used to place second piezoelectric vibrator 5.In the present invention; A through hole 221 is arranged on the X axis of central enclosure 2; Make second piezoelectric vibrator 5 under load pulses frequency (frequency generator provides) condition; Sleeve 8 receives the axial pulse of Y, and this moment, tapered channel 25 interior water were ejected by accurate syringe needle 6A under said pulse.
Shown in Fig. 2 A, the easy design of groove ring 23 water droplet generator convenient fixing in use.
The face of cylinder of boss 24 is provided with B through hole 241, and this B through hole 241 is used to place aqueduct 6B; The inner cylinder face of boss 24 is provided with interior round platform 242, and round platform 242 is used to support first piezoelectric vibrator 4 in this.
Shown in Fig. 2 B, tapered channel 25 is used for store water.
Circular channel 26 is used to place sleeve 8, and the two ends up and down of sleeve 8 are respectively installed with lasso 8A, following lasso 8B.
Tapered channel 25 is used for storage area water (water that water storage tank provides) with circular channel 26, the fluid chamber of tapered channel 25 and circular channel 26 formations water droplet generator of the present invention when carrying out the water droplet injection.
In the present invention, through flexible pipe 6C the water in the water storage tank is introduced in the tapered channel 25 and circular channel 26 of central enclosure 2, referring to Fig. 2 B, shown in Figure 5.Under the pulse signal effect that frequency generator provides, first piezoelectric vibrator produces the acoustic pressure Reeb in fluid chamber, and the free meniscus of the water (liquid) in acoustic pressure Reeb and accurate syringe needle 6A exit interacts and produces single drop injection; The water interaction that second piezoelectric vibrator 5 produces in flexural vibrations and the fluid chamber produces pressure wave, makes accurate syringe needle 6A exit produce continuous equal diameter water droplet.
In the present invention, central enclosure 2 adopts stainless steel material processing.
(3) bottom 3
Referring to Fig. 1, Figure 1A, Figure 1B, Fig. 1 C, shown in Figure 4, the upper surface of bottom 3 is a polishing plate face 31, and the below of bottom 3 is provided with taper round platform 32, and the center of taper round platform 32 is provided with F through hole 321, and this F through hole 321 is used to place little shape syringe needle 6A; The outer rim of bottom 3 is provided with G through hole 311, and this G through hole 311 is used for screw and passes the bottom that bottom 3 is connected central enclosure 2 that cooperates of realizing with the following stage body 22 bottom B through holes 222 of central enclosure 2.F through hole 321 designs at the taper round platform 32 of bottom 3 belows and taper round platform 32 centers have taken into full account in use, have avoided the interference at water droplet production process high speed air-flow.
In the present invention, be socketed with teflin ring 7 between the following stage body 22 of bottom 3 and central enclosure 2, sealing circle 7 can play the effect of sealing to the water that flows in the water droplet generator.
In the present invention, bottom 3 adopts stainless steel material processing.
(4) first piezoelectric vibrators 4
Shown in Fig. 1, Figure 1B, Fig. 1 C; First piezoelectric vibrator 4 includes Lithia niobium piezoelectric patches 41 and scale copper 42, positive electrode 43, negative electrode 44 and two teflon upper gasket 4A, lower gasket 4B that play fixation; Scale copper 42 is installed between upper gasket 4A and the lower gasket 4B; Lithia niobium piezoelectric patches 41 bonds together with scale copper 42, and positive electrode 43 is connected on the Lithia niobium piezoelectric patches 41 with negative electrode 44; Lithia niobium piezoelectric patches 41 and scale copper 42, positive electrode 43 and the negative electrode 44 formation piezo electric module that is assembled together.Lower gasket 4B is installed on the interior round platform 242 of central enclosure 2.
Be with dielectric film on positive electrode 43, the negative electrode 44.Positive electrode 43 passes the E through hole 132 of top cover 1, and negative electrode 44 passes the D through hole 131 of top cover 1.Positive electrode 43 is connected the frequency generator positive terminal through A lead 4C, and negative electrode 44 is connected the frequency generator negative pole end through B lead 4D.
The Lithia niobate single crystal material that Lithia niobium piezoelectric patches 41 adopts has high mechanical-electric coupling and extremely low SATT coefficient, excites high-frequency surface acoustic wave easily, is the optimal material that is used for making surface acoustic wave component.
In the present invention; Two electrodes of first piezoelectric vibrator 4 (being connected with frequency generator through lead on two electrodes) receive the data pulse string that the foreign frequency generator provides; The pulse signal that produces when frequency generator affacts 4 last times of first piezoelectric vibrator, thereby causes 4 actions of first piezoelectric vibrator.
In the present invention; First piezoelectric vibrator 4 is under the pulsed frequency f condition that frequency generator provides; The diameter of the single water droplet that produces is represented the interior diameter (m of unit) of miniature syringe needle for
d; V representes the effluxvelocity (m/s of unit) of water, and f representes the pulsed frequency that frequency generator provides.Under the effect of the potential pulse that applies, piezo electric module produces the acoustic pressure Reeb in fluid chamber (being tapered channel 25), and the free meniscus of the liquid at the pin hole place of acoustic pressure Reeb and accurate syringe needle 6A interacts and produces single drop injection.
In the present invention, under the pulse signal effect that frequency generator provides, first piezoelectric vibrator 4 produces the acoustic pressure Reeb in fluid chamber, and the free meniscus of the liquid in acoustic pressure Reeb and accurate syringe needle 6A exit interacts and produces single drop injection.
(5) second piezoelectric vibrators 5
Shown in Fig. 1, Figure 1B, Fig. 1 C, second piezoelectric vibrator 5 includes identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made up of A piezoelectric patches 51, positive electrode 53, negative electrode 54 and A electrode tip holder 57; A electrode tip holder 57 is provided with two through holes that supply positive electrode 53, negative electrode 54 to pass through; Positive electrode 53 is welded on the end face of A piezoelectric patches 51 with negative electrode 54; The other end of A piezoelectric patches 51 is bonded on the sleeve 8, and positive electrode 53, negative electrode 54 are connected with the frequency generator of outside after passing two through holes on the A electrode tip holder 57 respectively; Right piezo electric module is made up of B piezoelectric patches 52, positive electrode 55, negative electrode 56 and B electrode tip holder 58; B electrode tip holder 58 is provided with two through holes that supply positive electrode 55, negative electrode 56 to pass through; Positive electrode 55 is welded on the end face of B piezoelectric patches 52 with negative electrode 56; The other end of B piezoelectric patches 52 is bonded on the sleeve 8, and A piezoelectric patches 51 is bonded on the sleeve 8 with B piezoelectric patches 52 symmetries; Positive electrode 55, negative electrode 56 are connected with the frequency generator of outside after passing two through holes on the B electrode tip holder 58 respectively; A electrode tip holder 57 is identical with the structure of B electrode tip holder 58, adopts teflon to be processed into column structure with holes, and A piezoelectric patches 51 is identical with B piezoelectric patches 52 structures.
Connected mode according to right piezo electric module in like manner can get, and the positive electrode 53 in the left piezo electric module is connected the frequency generator positive terminal through C lead (not shown), and negative electrode 54 is connected the frequency generator negative pole end through D lead (not shown).
In the present invention, second piezoelectric vibrator 5 is under the pulsed frequency .f condition that frequency generator provides, and the diameter of a plurality of water droplets of generation does
Q representes the inflow (cm of unit of aqueduct 6B
3/ min), f representes the pulsed frequency that frequency generator provides.The generation of a plurality of water droplets is meant that the liquid form with jet under the pressure effect that piezoelectric patches produced in the generator flows out spout, and owing to the growth of jet fluid column surface capillary wave, final fracture is a string single drop then.
In the present invention; The Y that first piezoelectric vibrator 4 is arranged on the water droplet generator axially goes up (as shown in Figure 1); Second piezoelectric vibrator 5 is arranged on the X axis of water droplet generator (as shown in Figure 1); Through selecting these two Vib.s to drive the water in the central enclosure 2 respectively, make that the water droplet that ejects from syringe needle 6A is single or a plurality of continuously.
(6) sleeve 8
Shown in Figure 1B, Fig. 1 C, sleeve 8 inner upper ends are socketed with lasso 8A, and sleeve 8 inner lower ends are socketed with down lasso 8B.
In the present invention, A piezoelectric patches 51 and B piezoelectric patches 52 symmetries in second piezoelectric vibrator 5 are bonded on the sleeve 8, and under the pulse signal condition that the loading frequency generator produces, sleeve 8 can produce the water in extruding tapered channel 25 and the circular channel 26 along with frequency.
(7) O-ring seal 7
O-ring seal 7 adopts polytetrafluoroethylmaterial material processing, and O-ring seal 7 places between central enclosure 2 lower ends and the sleeve 8, and the water that O-ring seal 7 can seal in the central enclosure 2 oozes out.
(8) the syringe needle anchor clamps 6
Shown in Figure 1B, Fig. 1 C, the outside of syringe needle anchor clamps 6 is cylindrical, and the center, top of syringe needle anchor clamps 6 is designed to tapered channel 61, and the below of syringe needle anchor clamps 6 is used to install syringe needle 6A.Tapered channel 61 helps reducing in the water droplet production process viscous resistance between water and the taper surface.Syringe needle anchor clamps 6 adopt polytetrafluoroethylmaterial material processing.
(9) syringe needle 6A
Shown in Figure 1A, Figure 1B, Fig. 1 C, accurate syringe needle 6A is installed in the below of syringe needle anchor clamps 6, and the needle point of accurate syringe needle 6A is downward.Accurate syringe needle 6A utilizes electroplating principle that it is handled through the plating fluorine, can reduce the surface tension of syringe needle 6A surfaces externally and internally so greatly.When installing, the below of accurate syringe needle 6A and syringe needle anchor clamps 6 adopt a polytetrafluoroethylene sealing gasket circle to tighten.
In the present invention, the effluxvelocity of syringe needle 6A outlet outflow water does
V representes the effluxvelocity (m/s of unit) of water, and ξ representes jet efficient, and P representes the hydraulic pressure (Pa of unit) in syringe needle 6A exit, and ρ representes water-mass density (units/m
3).
Miniature syringe needle adopts Dongguan City according to the upright accurate syringe needle of creating the production of spot gluing equipment company limited.Can realize the drop diameter size is regulated through changing syringe needle.
(10) aqueduct 6B
Shown in Fig. 1 C, the junction of aqueduct 6B and central enclosure 2 seals with polyurethane sealant, and aqueduct 6B material is a teflon, and internal diameter is 1.5mm.
The miniature water droplet generator that the present invention uses when being a kind of ground wind tunnel experiment that is applicable to that the simulation wing freezes, the annexation of this water droplet generator is:
The upper end of central enclosure 2 is equipped with top cover 1, and the lower end of central enclosure 2 is equipped with O-ring seal 7, and the below of O-ring seal 7 is bottoms 3; In the tapered channel 25 of central enclosure 2 sleeve 8 is installed; The interior round platform 242 of central enclosure 2 tops supports first piezoelectric vibrator 4, and second piezoelectric vibrator 5 is installed in the A through hole 221 at central enclosure 2 middle parts; In the F through hole 321 of bottom 3 belows syringe needle anchor clamps 6 are installed, on the syringe needle anchor clamps 6 syringe needle are installed.
Referring to shown in Figure 5, the present invention is a kind of miniature water droplet generator of using when being applicable to the ground ice wind tunnel experiment that the simulation wing freezes, and operates the process that this water droplet generator produces water droplet to be:
(A) through flexible pipe 6B aqueduct 6 is communicated with water storage tank;
(B) make first piezoelectric vibrator 4 and frequency generator conducting through A lead 4C, B lead 4D;
(C) make second piezoelectric vibrator 5 and frequency generator conducting through A lead 5A, B lead 5B, C lead, D lead;
When (D) choosing 4 work of first piezoelectric vibrator, the voltage of regulating frequency generator output is 40～60V, frequency range 35～50Hz; Then the water droplet generator produces single water droplet;
When (E) choosing 5 work of second piezoelectric vibrator, the voltage of regulating frequency generator output is 2.5～5V, frequency range 0.4～1MHz; Then the water droplet generator produces a plurality of isodiametric water droplets continuously.
Claims (8)
1. miniature water droplet generator, it is characterized in that: this water droplet generator includes top cover (1), central enclosure (2), bottom (3), first piezoelectric vibrator (4), second piezoelectric vibrator (5), syringe needle anchor clamps (6), syringe needle (6A), aqueduct (6B), O-ring seal (7), sleeve (8); Sleeve (8) is a silica gel material, and O-ring seal (7) is a teflon;
The upper surface of top cover (1) is a polishing plate face (11), and the lower surface of top cover (1) is provided with outer toroid (12), interior round platform (13), is groove (14) between outer toroid (12) and the interior round platform (13); This groove (14) is used to place the boss (24) of central enclosure (2); Outer toroid (12) is provided with C through hole (121), circular trough (122); This C through hole (121) is coaxial with A threaded hole (211), and realizes being connected on top cover (1) and the central enclosure (2) through a screw; This circular trough (122) is used for aqueduct (6B) and passes; Interior round platform (13) is provided with D through hole (131), E through hole (132); D through hole (131) passes with positive electrode (43), negative electrode (44) that E through hole (132) is respectively applied on first piezoelectric vibrator (4);
Central enclosure (2) is provided with stage body (21), following stage body (22), is groove ring (23) between last stage body (21) and the following stage body (22), and last stage body (21) top is provided with boss (24); The center of central enclosure (2) is tapered channel (25), circular channel (26), and tapered channel (25) is in the top of circular channel (26); The end face of last stage body (21) is provided with A threaded hole (211); The face of cylinder of following stage body (22) is provided with A through hole (221), and this A through hole (221) is used to place second piezoelectric vibrator (5); The face of cylinder of boss (24) is provided with B through hole (241), and this B through hole (241) is used to place aqueduct (6B); The inner cylinder face of boss (24) is provided with interior round platform (242), and round platform (242) is used to support first piezoelectric vibrator (4) in this; Circular channel (26) is used to place sleeve (8), and the two ends up and down of sleeve (8) are respectively installed with lasso (8A), following lasso (8B); Tapered channel (25) and circular channel (26) constitute fluid chamber;
The upper surface of bottom (3) is a polishing plate face (31), and the below of bottom (3) is provided with taper round platform (32), and the center of taper round platform (32) is provided with F through hole (321), and this F through hole (321) is used to place little shape syringe needle (6A); The outer rim of bottom (3) is provided with G through hole (311); Be socketed with teflin ring (7) between the following stage body (22) of bottom (3) and central enclosure (2);
First piezoelectric vibrator (4) includes Lithia niobium piezoelectric patches (41) and scale copper (42), positive electrode (43), negative electrode (44) and two teflon upper gasket (4A), lower gaskets (4B) that play fixation; Scale copper (42) is installed between upper gasket (4A) and the lower gasket (4B); Lithia niobium piezoelectric patches (41) bonds together with scale copper (42), and positive electrode (43) is connected on the Lithia niobium piezoelectric patches (41) with negative electrode (44); Lithia niobium piezoelectric patches (41) and scale copper (42), positive electrode (43) and negative electrode (44) the formation piezo electric module that is assembled together; Lower gasket (4B) is installed on the interior round platform (242) of central enclosure (2);
Second piezoelectric vibrator (5) includes identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made up of A piezoelectric patches (51), positive electrode (53), negative electrode (54) and A electrode tip holder (57); A electrode tip holder (57) is provided with two through holes that supply positive electrode (53), negative electrode (54) to pass through; Positive electrode (53) is welded on the end face of A piezoelectric patches (51) with negative electrode (54); The other end of A piezoelectric patches (51) is bonded on the sleeve (8), and positive electrode (53), negative electrode (54) are connected with the frequency generator of outside after passing two through holes on the A electrode tip holder (57) respectively; Right piezo electric module is made up of B piezoelectric patches (52), positive electrode (55), negative electrode (56) and B electrode tip holder (58); B electrode tip holder (58) is provided with two through holes that supply positive electrode (55), negative electrode (56) to pass through; Positive electrode (55) is welded on the end face of B piezoelectric patches (52) with negative electrode (56); The other end of B piezoelectric patches (52) is bonded on the sleeve (8), and A piezoelectric patches (51) is bonded on the sleeve (8) with B piezoelectric patches (52) symmetry; Positive electrode (55), negative electrode (56) are connected with the frequency generator of outside after passing two through holes on the B electrode tip holder (58) respectively; A electrode tip holder (57) is identical with the structure of B electrode tip holder (58), and A piezoelectric patches (51) is identical with B piezoelectric patches (52) structure;
The outside of syringe needle anchor clamps (6) is cylindrical, and the center, top of syringe needle anchor clamps (6) is designed to tapered channel (61), and the below of syringe needle anchor clamps (6) is used to install syringe needle (6A).
2. miniature water droplet generator according to claim 1; It is characterized in that: A through hole (221) is arranged on the X axis of central enclosure (2); Make second piezoelectric vibrator (5) under the pulse signal condition that frequency generator provides; Sleeve (8) receives the axial pulse of Y, and the water in tapered channel this moment (25) is ejected by accurate syringe needle (6A) under said pulse.
3. miniature water droplet generator according to claim 1 is characterized in that: top cover (1), central enclosure (2), bottom (3) all adopt stainless steel material processing.
4. miniature water droplet generator according to claim 1; It is characterized in that: first piezoelectric vibrator (4) is under the pulsed frequency f condition that frequency generator provides; The diameter of the single water droplet that produces is represented the interior diameter (m of unit) of miniature syringe needle for
d; V representes the effluxvelocity (m/s of unit) of water, and f representes the pulsed frequency that frequency generator provides.Under the effect of the potential pulse that applies, piezo electric module produces the acoustic pressure Reeb in fluid chamber, and the free meniscus of the liquid at the pin hole place of acoustic pressure Reeb and accurate syringe needle (6A) interacts and produces single drop injection.
5. miniature water droplet generator according to claim 1 is characterized in that: second piezoelectric vibrator (5) is under the pulsed frequency f condition that frequency generator provides, and the diameter of a plurality of water droplets of generation does
Q representes the inflow (cm of unit of aqueduct 6B
3/ min), f representes the pulsed frequency that frequency generator provides.The generation of a plurality of water droplets is meant that the liquid form with jet under the pressure effect that piezoelectric patches produced in the generator flows out spout, and owing to the growth of jet fluid column surface capillary wave, final fracture is a string single drop then.
6. miniature water droplet generator according to claim 1; It is characterized in that: under the pulse signal effect that frequency generator provides; First piezoelectric vibrator (4) produces the acoustic pressure Reeb in fluid chamber, the free meniscus of the water in acoustic pressure Reeb and accurate syringe needle (6A) exit interacts and produces single drop injection.
7. miniature water droplet generator according to claim 1; It is characterized in that: under the pulse signal effect that frequency generator provides; The water interaction that second piezoelectric vibrator (5) produces in flexural vibrations and the fluid chamber produces pressure wave, makes accurate syringe needle (6A) exit produce continuous equal diameter water droplet.
8. miniature water droplet generator according to claim 1 is characterized in that: the effluxvelocity that water is flowed out in syringe needle (6A) outlet does
V representes the effluxvelocity (m/s of unit) of water, and ξ representes jet efficient, and P representes the hydraulic pressure (Pa of unit) in syringe needle (6A) exit, and ρ representes water-mass density (units/m
3).
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| CN 201110243962 CN102419246B (en) | 2011-08-24 | 2011-08-24 | Mini-type water drop generator |
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| CN111307405A (en) * | 2020-04-28 | 2020-06-19 | 中国空气动力研究与发展中心低速空气动力研究所 | Air flow pulse shear type single micro water drop generating device |
| CN112495675A (en) * | 2020-10-27 | 2021-03-16 | 浙江大学 | High flux micro-droplet generating device based on multi-source excitation |
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| CN112495675B (en) * | 2020-10-27 | 2022-04-01 | 浙江大学 | High flux micro-droplet generating device based on multi-source excitation |
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