CN103212508A - Piezoelectric ultrasonic atomizer - Google Patents
Piezoelectric ultrasonic atomizer Download PDFInfo
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- CN103212508A CN103212508A CN2013101261466A CN201310126146A CN103212508A CN 103212508 A CN103212508 A CN 103212508A CN 2013101261466 A CN2013101261466 A CN 2013101261466A CN 201310126146 A CN201310126146 A CN 201310126146A CN 103212508 A CN103212508 A CN 103212508A
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- orifice
- hole
- atomization
- atomizer
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Abstract
The invention discloses a piezoelectric ultrasonic atomizer, which comprises a metal diaphragm and a piezoelectric ceramic ring sheet in mutual connection, wherein the outer diameter of the piezoelectric ceramic ring sheet is smaller than or equal to the diameter of the metal diaphragm, a group of atomization holes are formed in the metal diaphragm and are positioned in the through hole region of the piezoelectric ceramic ring sheet, the longitudinal cross sections of the atomization holes in the group of atomization holes are in a cone shape, the opening diameter of one end facing the through hole is smaller than the opening diameter of the other end, and in addition, the spaces of any three adjacent atomization holes are identical or similar. The atomization holes meet the requirement that x is smaller than 1.2d1 but greater than 0.7d1, and in addition, the area of the atomization hole region meets a formula that A1=(30 percent to 45 percent)S, wherein d1 is the diameter of the opening of the atomization hole back to the through hole, x is the space of any three adjacent atomization holes, A1 is the total area of the atomization hole back to the through hole, and S is the distribution region area of the atomization holes. The piezoelectric ultrasonic atomizer has the advantages that through the arrangement of the atomizer, the problem of unstable atomization effect caused by design blindness of the atomizer is avoided, in addition, the service life of the atomizer is relatively prolonged, and the use cost is reduced.
Description
Technical field
The present invention relates to a kind of atomizer, be used for liquid is transported, transmits, relate in particular to and utilize piezoelectric ceramics to carry out the atomizer of ultrasonic atomizatio.
Background technology
Liquid is broken up the process that is converted into vaporific droplet be called atomizing, it is actual to be a kind of energy conversion process, the electric energy of input is converted into the mechanical energy and the produced simultaneously other forms of energy of droplet, such as heat energy.
The existing piezoelectric ceramic ultrasonic atomizer (as shown in Figures 1 and 2) that uses, the distributed constant of orifice and arrangement mode lack certain rules on its metallic membrane, have certain blindness in the atomizer in the design of orifice, this inevitably makes the final work effect of atomizer exist certain unstability.For example, give regularly when the energy that atomizer is imported, too small, atomizing hole count n that orifice spacing x designs cross the energy minimizing that ambassador distributes to each orifice, and atomizing effect reduces.Simultaneously too small because of orifice spacing x, serious stress concentration and stress fatigue can appear in the orifice distributed areas, and cause atomizer shortening in service life, atomising device use cost to increase relatively; Otherwise n is too small when excessive, the atomizing hole count of orifice spacing x design, and the hole count that then participates in atomization process is very few, and capacity usage ratio is low, and atomizing effect is also undesirable.
This shows that the design of orifice plays crucial effects to whether the stablizing of duty of atomizer in the atomizer, need to propose a kind of rational orifice distributed constant and arrangement scheme.
Summary of the invention
Technical problem
The technical problem to be solved in the present invention provides a kind of piezoelectric supersonic atomization device that orifice is carried out special arrangement and arrangement, improve the capacity usage ratio of atomizer, increase atomization quantity, improve atomizing effect, and prolong service life of atomizer relatively, reduce the use cost of atomising device relatively.
Technical scheme
In order to solve above-mentioned technical problem, piezoelectric supersonic atomization device of the present invention comprises metallic membrane and the piezoelectric ceramics ring plate that is connected, wherein, the external diameter of piezoelectric ceramics ring plate is less than or equal to the diameter of metallic membrane, the zone that metallic membrane is positioned at the through hole of piezoelectric ceramics ring plate has one group of orifice, the longitudinal section of each orifice in described one group of orifice is tapered, be it towards an end opening diameter of through hole opening diameter less than the other end, and the spacing of three arbitrarily adjacent orifices is identical, and perhaps the spacing between three orifices is very approaching.The common structure of the whole employing of piezoelectric supersonic atomization device of the present invention, its metallic membrane and piezoelectric ceramics ring plate combine by the mode of bonding or welding, a through hole is arranged in the middle of the piezoelectric ceramics ring plate, offer orifice thick and fast in the corresponding zone of metallic membrane, wherein, each orifice adopts the structure that an end opening is little, other end opening is big slightly.
Further, described adjacent being provided with of three orifices arbitrarily satisfied 0.7d
1＜x＜1.2d
1, and A
1=(30%～45%) S, wherein, d
1The diameter that deviates from the opening of through hole for orifice is the diameter of the big slightly end opening of orifice, and x is that the described spacing of three adjacent orifices arbitrarily is the distance between the big slightly end opening edge of adjacent orifice, A
1For orifice deviates from the gross area of the opening of through hole, S is orifice distributed areas areas.
In the technical scheme of the present invention, each orifice spacing basically identical (is x
1≈ x
2≈ x
3≈ x), the orifice center of circle connects into one and is approximately equilateral triangle between every three adjacent orifices, and the requirement of its concrete distributed constant and arrangement mode is to come out by the structural parameters of capacity usage ratio and orifice and the relation inference of distributed constant.
Beneficial effect
Piezoelectric supersonic atomization device of the present invention has been avoided making the atomizing effect problem of unstable because of the blindness that the atomizer design exists.The present invention simultaneously can also help to improve the capacity usage ratio of atomizer, increases atomization quantity, improves atomizing effect, and prolongs the service life of atomizer relatively, reduces the use cost of atomising device relatively.
Description of drawings
Fig. 1 piezoelectric ceramic ultrasonic atomizer structure and principle schematic;
The distribution schematic diagram of each construction unit in the existing piezoelectric ceramic ultrasonic atomizer of Fig. 2;
Distributed constant schematic diagram between orifice in the existing piezoelectric ceramic ultrasonic atomizer of Fig. 3;
The structural parameters schematic diagram of Fig. 4 piezoelectric ceramic ultrasonic atomizer orifice;
Fig. 5 piezoelectricity of the present invention two kinds of limiting case schematic diagrames that the atomizing hole count distributes in the orifice distributed areas in the atomizer of overfulfiling a production target, wherein (a) is a kind of limiting case A schematic diagram, (b) is another kind of limiting case B schematic diagram;
Distributed constant schematic diagram between orifice in Fig. 6 piezoelectric supersonic atomization device of the present invention;
Each construction unit distribution schematic diagram in Fig. 7 piezoelectric supersonic atomization device of the present invention.
The specific embodiment
Below with reference to accompanying drawing the present invention is further specified.
At first, in conjunction with Fig. 1 and Fig. 2 the operation principle of piezoelectric ceramics atomizer is described.There is a zone that is distributing intensive small orifice 3 metallic membrane 1 central area, be piezoelectric ceramics ring plate 2 outside orifice 3 distributed areas, metallic membrane 1 and piezoelectric ceramics ring plate 2 are joined with the AC power both positive and negative polarity respectively, and the magnitude of voltage of input is U, and the ac frequency of input is f.Energy computing formula according to alternating current can get, ENERGY E and magnitude of voltage U that alternating current is supplied with, and incoming frequency f square is directly proportional, i.e. E=kUf
2(wherein k is a coefficient).Input voltage value U is given in real work, can determine that so the energy of importing depends on the size of incoming frequency f.The ac frequency f that is imported as can be known by piezoelectric ceramic ultrasonic atomizer operation principle equates with the intrinsic frequency of atomizer.And the intrinsic frequency of atomizer is by the decision of the overall structure parameter of atomizer, because of orifice 3 is extremely small, and (the big nose end diameter d that comprises orifice of orifice parameter in the orifice zone 3
1, the small bore end diameter d
2, relative spacing x, number n, the macropore gross area A of orifice between the axial length t, orifice
1And aperture gross area A
2) little to the intrinsic frequency influence of atomizer, can be considered as a definite value.The frequency that U is given, input AC is electric is a definite value also, according to E=kUf
2The ENERGY E that can find the alternating current input is certain.
As Fig. 3, shown in 4, the axial length t of orifice 3 by the central area thickness decision of metallic membrane, is a definite value generally.The hole diameter d of orifice 3
2Depending on the droplet size that atomizing is required, is a definite value.As t, d
2When determining, the macropore diameter d of orifice 3
1Being limited by the optimum taper angle theta of orifice, also is a definite value.According to formula
D is certain, hole count n is big more, the orifice gross area is also big more, the spacing x of orifice is more little, so only need how to determine the number n of orifice to the design of orifice, but because of atomize hole count n and orifice spacing x are mutually related, the design to atomizing hole count n in actual design can be converted into determining orifice spacing x.
According to the relation of above-mentioned input ENERGY E and orifice hole count n, can be earlier be the method for designing that clue is determined orifice with the transformation efficiency of energy.When the input ENERGY E certain, n is variable, then must a rational range of choice be arranged n.Shown in Fig. 5 (a), when n less than certain value (n
Min) time, the hole count that participates in atomizing is limited, causes that atomizing effect is not good, atomization quantity is little.In addition, the little energy that atomizing consumes has lot of energy to be converted into heat energy, and capacity usage ratio is not high; Otherwise, shown in Fig. 5 (b), when n greater than certain value (n
Max) time, because it is too much to participate in the hole count of orifice, and the ENERGY E of input is limited, and the energy of distributing to each orifice like this reduces relatively, and atomizing effect may reduce.Simultaneously, the atomizing hole count too much makes orifice spacing x too little, and the orifice area contents is prone to stress and concentrates, under the duty of dither, region of stress concentration is easy to occur fatigue damage, and then causes shorten the service life of atomizer, and use cost improves.So atomizing hole count n excessive or too small all be inappropriate.According to the designing requirement of atomizing hole count n, n is relevant with orifice spacing x because of the atomizing hole count, so only need determine orifice spacing x in design in practice.
According to above principle, as Fig. 6, shown in Figure 7, the piezoelectric supersonic atomization device of present embodiment comprises metallic membrane 1 and the piezoelectric ceramics ring plate 2 that is connected, wherein, the external diameter of piezoelectric ceramics ring plate 2 is less than or equal to the diameter of metallic membrane 1, the zone that metallic membrane 1 is positioned at the through hole 4 of piezoelectric ceramics ring plate 2 has one group of orifice 3, the longitudinal section of the orifice in described one group of orifice 3 is tapered, it is towards an end opening diameter of through hole 4 opening diameter less than the other end, and the spacing of three adjacent orifices is identical or very approaching arbitrarily.Described adjacent being provided with of three orifices arbitrarily satisfied 0.7d
1＜x＜1.2d
1, and the area in orifice zone satisfies A
1=(30%～45%) S, wherein, d
1For orifice 3 deviates from the diameter of the opening of through hole 4, x is the described spacing of three adjacent orifices arbitrarily, A
1For orifice 3 deviates from the gross area of the opening of through hole 4, S is orifice distributed areas areas.The atomizer atomizing effect of this kind structure is more satisfactory, can not occur in the orifice distributed areas that big stress is concentrated and stress fatigue yet, avoid in the present stage problems such as atomizing effect instability that the blindness because of the orifice design causes, atomizer shortening in service life.
Claims (2)
1. piezoelectric supersonic atomization device, comprise interconnective metallic membrane (1) and piezoelectric ceramics ring plate (2), wherein, the external diameter of piezoelectric ceramics ring plate (2) is less than or equal to the diameter of metallic membrane (1), be positioned at piezoelectric ceramic ring sheet (2) through hole (4) zone on the metallic membrane (1) and be provided with one group of orifice (3), it is characterized in that, the longitudinal section of the orifice in described one group of orifice (3) is tapered, it is towards an end opening diameter of through hole (4) opening diameter less than the other end, and the spacing of three adjacent orifices is identical arbitrarily.
2. piezoelectric supersonic atomization device as claimed in claim 1 is characterized in that, described adjacent being provided with of three orifices arbitrarily satisfied 0.7d
1＜x＜1.2d
1, and the area in orifice zone satisfies A
1=(30%～45%) S, wherein, d
1For orifice (3) deviates from the diameter of the opening of through hole (4), x is the described spacing of three adjacent orifices arbitrarily, A
1For orifice (3) deviates from the gross area of the opening of through hole (4), S is orifice distributed areas areas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101261466A CN103212508A (en) | 2013-04-11 | 2013-04-11 | Piezoelectric ultrasonic atomizer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101261466A CN103212508A (en) | 2013-04-11 | 2013-04-11 | Piezoelectric ultrasonic atomizer |
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| CN103212508A true CN103212508A (en) | 2013-07-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103477966A (en) * | 2013-09-13 | 2014-01-01 | 江苏大学 | Intelligent intermediate-frequency ultrasonic atomizing cultivation machine |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201172029Y (en) * | 2008-04-10 | 2008-12-31 | 汕头市先宁电子有限公司 | Ultrasonic microatomization transducer |
| CN101773894A (en) * | 2010-03-11 | 2010-07-14 | 清华大学 | Phase-controlled ultrasonic wave atomizing nozzle |
| WO2012063951A1 (en) * | 2010-11-09 | 2012-05-18 | Sumimoto Chemical Company , Limited | Ultrasonic atomizing unit |
| WO2012092163A1 (en) * | 2010-12-28 | 2012-07-05 | Novartis Ag | Photodefined aperture plate and method for producing the same |
| CN102896064A (en) * | 2012-10-26 | 2013-01-30 | 南京航空航天大学 | Piezoelectric ceramic ultrasonic atomization sheet |
-
2013
- 2013-04-11 CN CN2013101261466A patent/CN103212508A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201172029Y (en) * | 2008-04-10 | 2008-12-31 | 汕头市先宁电子有限公司 | Ultrasonic microatomization transducer |
| CN101773894A (en) * | 2010-03-11 | 2010-07-14 | 清华大学 | Phase-controlled ultrasonic wave atomizing nozzle |
| WO2012063951A1 (en) * | 2010-11-09 | 2012-05-18 | Sumimoto Chemical Company , Limited | Ultrasonic atomizing unit |
| WO2012092163A1 (en) * | 2010-12-28 | 2012-07-05 | Novartis Ag | Photodefined aperture plate and method for producing the same |
| CN102896064A (en) * | 2012-10-26 | 2013-01-30 | 南京航空航天大学 | Piezoelectric ceramic ultrasonic atomization sheet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103477966A (en) * | 2013-09-13 | 2014-01-01 | 江苏大学 | Intelligent intermediate-frequency ultrasonic atomizing cultivation machine |
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Application publication date: 20130724 |