CN102419246B - Mini-type water drop generator - Google Patents
Mini-type water drop generator Download PDFInfo
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- CN102419246B CN102419246B CN 201110243962 CN201110243962A CN102419246B CN 102419246 B CN102419246 B CN 102419246B CN 201110243962 CN201110243962 CN 201110243962 CN 201110243962 A CN201110243962 A CN 201110243962A CN 102419246 B CN102419246 B CN 102419246B
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Abstract
本发明公开了一种微型水滴发生器，该水滴发生器用于实现在地面冰风洞中产生单个或是多个水滴，为研究水滴在高速运动过程中形变、破碎、温度和速度的变化以及对机翼的撞击特性等提供帮助。该水滴发生器的设计是基于Rayleigh不稳定原理的。本发明的水滴发生器包括压电装置、引水管和中部壳体以及精密针头等零件。在频率发生器提供的脉冲信号作用下，第一压电振动器在液体腔中产生声压力波，声压力波与精密针头出口处的液体自由弯月面相互作用而产生单个液滴喷射；第二压电振动器产生弯曲振动与液体相互作用产生压力波，使得精密针头出口处产生连续的等直径水滴。
The invention discloses a miniature water droplet generator, which is used to generate single or multiple water droplets in a ground ice wind tunnel. The impact characteristics of the wing, etc. help. The design of the droplet generator is based on the Rayleigh instability principle. The water droplet generator of the present invention includes parts such as a piezoelectric device, a water diversion pipe, a middle shell, and a precision needle. Under the action of the pulse signal provided by the frequency generator, the first piezoelectric vibrator generates an acoustic pressure wave in the liquid chamber, and the acoustic pressure wave interacts with the liquid free meniscus at the exit of the precision needle to generate a single droplet jet; the second The two piezoelectric vibrators generate bending vibrations and interact with the liquid to generate pressure waves, making continuous equal-diameter water droplets at the exit of the precision needle.
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 for generation of the water droplet generator of miniature water droplet specifically in the icing tunnel of research droplets impact its behavior is tested.
Background technology
In the cloud layer, the size of liquid water droplets is very inconsistent, can be made of several microns the water dust raindrop to a hundreds of micron.The existence of super-cooling waterdrop in the atmosphere is the greatest 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 also can occur splashing and rebound phenomena, the icing mechanism of therefore crossing cold big water droplet was comparatively complicated when the bump wing.
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 special wind-tunnel anti-, the deicing technology thereof of aircraft when being research aircraft flight.The water droplet that obtains the diameter that requires is the 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 is subjected to isoparametric influence of velocity magnitude, water droplet size, temperature of super-cooling waterdrop and its relative motion in the atmosphere; Icing tunnel is to be mainly used to the ground experiment system that simulated aircraft freezes, 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 thermal parameter all can have influence directly or indirectly to last ice shape with in the icing position of wing.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, there are 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 multiple 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 by 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 silica gel material, and O-ring seal (7) is teflon;
The upper surface of top cover (1) is 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 for placing 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) by 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 for placing 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 for placing aqueduct (6B); The inner cylinder face of boss (24) is provided with interior round platform (242), and round platform (242) is used for supporting first piezoelectric vibrator (4) in this; Circular channel (26) is used for placing 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 liquid chambers;
The upper surface of bottom (3) is 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 for placing 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) is bonded 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 the identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made 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), 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 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 for installing 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, by optionally connecting first piezoelectric vibrator 4 and second piezoelectric vibrator 5, by voltage magnitude and the frequency of the generator of adjusting frequency, can obtain the miniature water droplet of single or multiple necessary requirement diameter then.
2. be installed in accurate syringe needle 6A on the syringe needle anchor clamps 6 by replacing, can realize the diameter of the drop of accurate syringe needle 6A outgoing is regulated.
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 finished the generation of single or multiple miniature water droplets by 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 the miniature water droplet generator of the present invention and water storage tank, frequency generator connection diagram.
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
5B.B lead 6. syringe needle anchor clamps 61. tapered channel 6A. syringe needle 6B. aqueducts
6C. flexible pipe 7. O-ring seals 8. sleeve 8A. go up lasso under the lasso 8B.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
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 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; 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 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, and this A threaded hole 211 is used for cooperating with through hole on the top cover 1, is to be installed together above realizing top cover 1 and central enclosure 2 under the web member at screw.
The face of cylinder of following stage body 22 is provided with A through hole 221, and this A through hole 221 is used for placing 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 be subjected to Y-axis to pulse, the water in this moment tapered channel 25 are ejected by accurate syringe needle 6A under described pulse.
Shown in Fig. 2 A, the design of groove ring 23 has made things convenient for 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 for placing aqueduct 6B; The inner cylinder face of boss 24 is provided with interior round platform 242, and round platform 242 is used for supporting first piezoelectric vibrator 4 in this.
Shown in Fig. 2 B, tapered channel 25 is used for storing water.
In the present invention, by 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 liquid chambers, 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 liquid chambers 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 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 for placing 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 is bonded 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.
Scale copper 42 thickness are 0.2mm, and Lithia niobium piezoelectric patches 41 thickness are 0.2mm.
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 by A lead 4C, and negative electrode 44 is connected the frequency generator negative pole end by B lead 4D.
The Lithia niobate single crystal material that Lithia niobium piezoelectric patches 41 adopts has high mechanical-electric coupling and extremely low acoustic attenuation coefficient, excites high-frequency surface acoustic wave easily, is the optimal material of making surface acoustic wave component.
In the present invention, two electrodes of first piezoelectric vibrator 4 (being connected with frequency generator by lead on two electrodes) receive the data pulse string that the foreign frequency generator provides, when the pulse signal of frequency generator generation is applied on first piezoelectric vibrator 4, thereby cause 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, and the diameter of the single water droplet of generation is
D represents the interior diameter (m of unit) of miniature syringe needle, and v represents the effluxvelocity (m/s of unit) of water, and f represents 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 liquid chambers (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 liquid chambers, 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 the identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made 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, 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 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 by C lead (not shown), and negative electrode 54 is connected the frequency generator negative pole end by 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 is
Q represents the inflow (cm of unit of aqueduct 6B
3/ min), f represents the pulsed frequency that frequency generator provides.The generation of a plurality of water droplets refers to that the liquid form with jet under the pressure effect that piezoelectric patches produces 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-axis that first piezoelectric vibrator 4 is arranged on the water droplet generator makes progress (as shown in Figure 1), second piezoelectric vibrator 5 is arranged on the X axis of water droplet generator (as shown in Figure 1), by selecting these two Vib.s to drive 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, the upper end of sleeve 8 inside is socketed with lasso 8A, and the lower end of sleeve 8 inside is socketed with down lasso 8B.
In the present invention, the A piezoelectric patches 51 in second piezoelectric vibrator 5 is bonded on the sleeve 8 with B piezoelectric patches 52 symmetries, and under the pulse signal condition that the loading frequency generator produces, sleeve 8 can produce the water that pushes in 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 for installing syringe needle 6A.Tapered channel 61 is conducive to reduce 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 is
V represents the effluxvelocity (m/s of unit) of water, and ξ represents jet efficient, and P represents the hydraulic pressure (Pa of unit) in syringe needle 6A exit, and ρ represents 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 by 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 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) by flexible pipe 6B aqueduct 6 is communicated with water storage tank;
(B) make first piezoelectric vibrator 4 and frequency generator conducting by A lead 4C, B lead 4D;
(C) make second piezoelectric vibrator 5 and frequency generator conducting by 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 silica gel material, and O-ring seal (7) is teflon;
The upper surface of top cover (1) is 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 for placing 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) by 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 for placing 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 for placing aqueduct (6B); The inner cylinder face of boss (24) is provided with interior round platform (242), and round platform (242) is used for supporting first piezoelectric vibrator (4) in this; Circular channel (26) is used for placing 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 liquid chambers;
The upper surface of bottom (3) is 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 for placing 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) is bonded 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 the identical left piezo electric module of structure and right piezo electric module; Left side piezo electric module is made 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), 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 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 for installing 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) be subjected to Y-axis to pulse, the water in this moment tapered channel (25) is ejected by accurate syringe needle (6A) under described 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, and the diameter of the single water droplet of generation is
D represents the interior diameter of miniature syringe needle, and unit is m, and v represents the effluxvelocity of water, and unit is m/s, and f represents 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 liquid chambers, 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, it 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 is
Q represents the inflow of aqueduct (6B), and unit is cm
3/ min, f represent the pulsed frequency that frequency generator provides; The generation of a plurality of water droplets refers to that the liquid form with jet under the pressure effect that piezoelectric patches produces 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 liquid chambers, 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 liquid chambers 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 is
V represents the effluxvelocity of water, and unit is m/s, and ξ represents jet efficient, and P represents the hydraulic pressure in syringe needle (6A) exit, and unit is Pa, and ρ represents water-mass density, and unit is kg/m
3
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| CN105890861B (en) * | 2016-04-05 | 2018-11-27 | 南京航空航天大学 | A kind of multi-functional type water drop generator |
| CN106885686B (en) * | 2017-03-20 | 2018-12-14 | 华中科技大学 | A kind of drop high speed hits the experimental rig of wall |
| CN107568187B (en) * | 2017-09-19 | 2020-11-20 | 江苏大学 | A single droplet generating device used in the field of plant protection |
| CN111307405B (en) * | 2020-04-28 | 2020-08-11 | 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 |
| CN112495675B (en) * | 2020-10-27 | 2022-04-01 | 浙江大学 | High flux micro-droplet generating device based on multi-source excitation |
| CN115384805B (en) * | 2021-05-24 | 2024-12-03 | 上海交通大学 | Supercooled large water drop generating device and method |
| CN119245997B (en) * | 2024-12-04 | 2025-04-01 | 天目山实验室 | Coefficient measuring method, device, equipment and medium for deformed liquid drop |
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| US4526031A (en) * | 1983-01-10 | 1985-07-02 | The B. F. Goodrich Company | Method and apparatus for prognosticating potential ice accumulation on a surface exposed to impact icing |
| JPH063218A (en) * | 1992-06-22 | 1994-01-11 | Mitsubishi Heavy Ind Ltd | Suction type impact wind tunnel |
| JP3643702B2 (en) * | 1998-05-27 | 2005-04-27 | 三菱重工業株式会社 | Prediction method of white smoke generation area |
| US7954730B2 (en) * | 2005-05-02 | 2011-06-07 | Hong Kong Piezo Co. Ltd. | Piezoelectric fluid atomizer apparatuses and methods |
| US20060289673A1 (en) * | 2005-06-22 | 2006-12-28 | Yu-Ran Wang | Micro-droplet generator |
| JP4483966B2 (en) * | 2007-06-01 | 2010-06-16 | 株式会社デンソー | Water droplet generating apparatus and water droplet generating method |
| DE102007031660A1 (en) * | 2007-07-06 | 2009-01-08 | Kba-Metronic Ag | Method and apparatus for generating and deflecting ink drops |
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