JPH0227027B2 - - Google Patents
Info
- Publication number
- JPH0227027B2 JPH0227027B2 JP2750384A JP2750384A JPH0227027B2 JP H0227027 B2 JPH0227027 B2 JP H0227027B2 JP 2750384 A JP2750384 A JP 2750384A JP 2750384 A JP2750384 A JP 2750384A JP H0227027 B2 JPH0227027 B2 JP H0227027B2
- Authority
- JP
- Japan
- Prior art keywords
- nozzle
- piezoelectric element
- atomizer
- pressurizing chamber
- liquid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007788 liquid Substances 0.000 claims description 16
- 238000000889 atomisation Methods 0.000 claims description 7
- 239000007921 spray Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 238000009688 liquid atomisation Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000006903 response to temperature Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
- B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
- B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
- B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
- B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
- B05B17/0646—Vibrating plates, i.e. plates being directly subjected to the vibrations, e.g. having a piezoelectric transducer attached thereto
Landscapes
- Special Spraying Apparatus (AREA)
- Apparatuses For Generation Of Mechanical Vibrations (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は圧電素子を用いて灯油や軽油等の液体
燃料・水・薬溶液・記録液等を霧化する液体の霧
化装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a liquid atomization device that uses a piezoelectric element to atomize liquid fuel such as kerosene or light oil, water, medicinal solution, recording liquid, etc.
従来例の構成とその問題点
従来から液体の霧化装置には、種々のものが提
案されており、圧電素子を用いたものも多く見う
けられる。Configurations of Conventional Examples and Their Problems Various types of liquid atomization devices have been proposed in the past, and many of them use piezoelectric elements.
近年、駆動パワーが小さく、コンパクトであ
り、しかも、20c.c.／mm以上もの霧化量が得られる
霧化器として第１図のような構成のものが提案さ
れた。霧化器のボデイー１は、液体を充填する加
圧室２を備え、液体は供給パイプ３を介して前記
加圧室２に入り、霧化動作中は気体排出用のパイ
プ４の途中まで満たされる。５は、加圧室２の一
面に臨んで配されたノズル部で、その外周はボデ
イー１に接合されている。ノズル部５の中央に
は、噴霧液滴吐出用の微細な孔（50〜100μm）が
開けられている。さらにノズル部５には、厚さ
0.5〜１mm，外径10〜20mmの円環状の圧電素子６
が接合されている。この圧電素子６は厚さ方向に
分極された圧電セラミツクで、ノズルとの接合面
及び反対側の面には電極を有している。７，８は
圧電素子６へ駆動信号を伝達するための導線でそ
れぞれ圧電素子の片電極と、ボデイー１へ接続さ
れている。駆動信号により圧電素子６の機械的振
動が励起されると、ノズル部５も付勢されて加振
されるので、加圧室２内に圧力上昇が発振し、結
果として液体が霧化粒子９となつて吐出される。
１０は、負圧発生用のフアンで、液体タンク１１
から供給パイプ３を介して液体を引き上げ、加圧
室２及び排気パイプ４の途中まで液体を満たす作
用をする。この構成によれば、圧電素子の消費電
力が数百ミリワツトで、20c.c.／mm以上もの噴霧が
実現される。 In recent years, an atomizer with a configuration as shown in Fig. 1 has been proposed as an atomizer that requires low driving power, is compact, and can obtain an atomization amount of 20 c.c./mm or more. The body 1 of the atomizer includes a pressurized chamber 2 filled with liquid, and the liquid enters the pressurized chamber 2 through a supply pipe 3, and the gas discharge pipe 4 is filled halfway during the atomizing operation. It will be done. Reference numeral 5 denotes a nozzle portion facing one side of the pressurizing chamber 2, and its outer periphery is joined to the body 1. A fine hole (50 to 100 μm) is opened in the center of the nozzle portion 5 for discharging spray droplets. Furthermore, the nozzle portion 5 has a thickness
Annular piezoelectric element 6 with an outer diameter of 0.5 to 1 mm and an outer diameter of 10 to 20 mm
are joined. This piezoelectric element 6 is a piezoelectric ceramic polarized in the thickness direction, and has electrodes on the surface to be joined to the nozzle and on the opposite surface. 7 and 8 are conductive wires for transmitting a drive signal to the piezoelectric element 6, and are connected to one electrode of the piezoelectric element and the body 1, respectively. When the mechanical vibration of the piezoelectric element 6 is excited by the drive signal, the nozzle part 5 is also energized and vibrated, so that a pressure rise oscillates in the pressurizing chamber 2, and as a result, the liquid is atomized by the atomized particles 9. It is discharged as follows.
10 is a fan for generating negative pressure, and a liquid tank 11
The liquid is pulled up through the supply pipe 3 to fill the pressurizing chamber 2 and the exhaust pipe 4 halfway with the liquid. According to this configuration, the power consumption of the piezoelectric element is several hundred milliwatts, and a spray of 20 c.c./mm or more can be realized.
この霧化器の駆動方法としては、第２図，第３
図の方法がある。第２図は、発振器１２から所定
の周期の発振信号を増幅器１３に加え、霧化器と
して構成された圧電素子６を駆動するものであ
る。第３図は、圧電素子に流れる電流を電流検出
器１４にて検出し、バンドパスフイルタ１５を介
して増幅器１３に帰還して自励発振を行わせるも
のである。第３図の構成では、圧電素子の共振点
のうち、効率よく液体の霧化動作を行う点で発振
を続行させるため、バンドパスフイルタを配して
スプリアスモードでの発振を抑制している。 The driving method for this atomizer is shown in Figures 2 and 3.
There is a method shown in the figure. In FIG. 2, an oscillation signal of a predetermined period is applied from an oscillator 12 to an amplifier 13 to drive a piezoelectric element 6 configured as an atomizer. In FIG. 3, the current flowing through the piezoelectric element is detected by a current detector 14 and fed back to the amplifier 13 via a bandpass filter 15 to cause self-oscillation. In the configuration shown in FIG. 3, in order to continue oscillation at the resonance point of the piezoelectric element where the liquid is efficiently atomized, a bandpass filter is provided to suppress oscillation in spurious mode.
しかし、上記従来の霧化装置は種々の欠点を有
していた。圧電素子を組み込んだ霧化器の温度特
性には、まず第４図に示すような共振点の変動が
あるが、第２図の方法では圧電素子そのものの温
度を検出するなどの方法で発振周波数に補正を加
えなければならなかつた。しかし、圧電素子の温
度を検出することは非常に困難であつた。また、
第３図の方法では、圧電素子の共振特性のＱが低
い場合には、周波数追尾はこれも非常に困難であ
つた。 However, the above-mentioned conventional atomization devices had various drawbacks. The temperature characteristics of an atomizer incorporating a piezoelectric element include fluctuations in the resonance point as shown in Figure 4. However, in the method shown in Figure 2, the oscillation frequency is determined by detecting the temperature of the piezoelectric element itself. I had to make some corrections. However, it has been extremely difficult to detect the temperature of the piezoelectric element. Also,
In the method shown in FIG. 3, frequency tracking is also very difficult when the resonance characteristic of the piezoelectric element has a low Q value.
また、第５図で従来例の霧化器のインピーダン
スループを示しているが、ループ１は加圧室中が
空の状態、ループ２は液体充填の状態である。こ
の図から分かるように、霧化動作中は特に容量性
の特性が強い。すなわち、制動インピーダンスの
作用が大きく、温度特性を含めて、噴霧量に比例
した電気的信号を検出することは困難であつた。
それ故、従来では増幅器のゲインを霧化器の噴霧
量特性に合わせ、さらに、温度変化に対してはあ
らかじめ設定した特性で変化させるなどの方法を
とつていた。しかし、環境変化や、経時変化等で
ノズル部と圧電素子の接合、あるいは、ノズル部
とボデイーとの接合が劣化した場合には、従来の
補正方法では所定の噴霧量を得られなかつた。 Further, FIG. 5 shows impedance loops of a conventional atomizer, in which loop 1 is in a state where the pressurizing chamber is empty, and loop 2 is in a state where the pressurizing chamber is filled with liquid. As can be seen from this figure, the capacitive characteristics are particularly strong during the atomization operation. That is, the effect of braking impedance is large, and it is difficult to detect an electrical signal proportional to the spray amount, including temperature characteristics.
Therefore, in the past, methods have been used in which the gain of the amplifier is matched to the spray amount characteristics of the atomizer, and furthermore, the gain is varied according to preset characteristics in response to temperature changes. However, when the bond between the nozzle portion and the piezoelectric element or the bond between the nozzle portion and the body deteriorates due to environmental changes, changes over time, etc., it is not possible to obtain a predetermined spray amount using conventional correction methods.
発明の目的
本発明は、このような従来の欠点を除去するも
ので、周囲温度等の環境変化や、経時変化による
特性の変動、あるいは、劣化に対しても、所定の
噴霧量が得られる霧化装置の提供を目的とする。Purpose of the Invention The present invention aims to eliminate such conventional drawbacks, and provides a mist that can obtain a predetermined amount of spray even when the characteristics change due to environmental changes such as ambient temperature, changes over time, or deterioration. The purpose is to provide a
発明の構成
この目的を達成するために本発明は、前記従来
例で示した霧化器の構成に加えて、加圧室２の中
に圧力検知器を設けている。そして、前述のノズ
ル部と接合した圧電素子６を駆動する駆動部は、
前記圧力検知器からの信号を入力している。Structure of the Invention In order to achieve this object, the present invention provides a pressure sensor in the pressurizing chamber 2 in addition to the structure of the atomizer shown in the conventional example. The drive section that drives the piezoelectric element 6 connected to the nozzle section described above is
The signal from the pressure sensor is input.
この構成により、圧電素子６で加振されたノズ
ル部の作用による加圧室中の液体圧力変動を前記
圧力検知器がとらえ、所定の値になるように、駆
動部で印加電力の調整を行う。その結果、常に所
定の噴霧量が得られる。 With this configuration, the pressure detector detects liquid pressure fluctuations in the pressurizing chamber due to the action of the nozzle section excited by the piezoelectric element 6, and the drive section adjusts the applied power so that it reaches a predetermined value. . As a result, a predetermined amount of spray is always obtained.
実施例の説明
第６図により本発明の一実施例について説明す
る。第１図と同一番号のものは、同じ機能を有す
る構成部品である。圧力検知器１６は、加圧室２
内の前記ノズル部５と対向した位置に設けられて
いる。第６図では、厚さ方向に分極された圧電素
子を圧力検知器として用いており、その片面は電
極を介してボデイー１へ接合され、他の面に形成
された電極からは導線１７が出ている。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Components with the same numbers as in FIG. 1 have the same functions. The pressure detector 16 is located in the pressurized chamber 2
It is provided at a position facing the nozzle part 5 inside. In FIG. 6, a piezoelectric element polarized in the thickness direction is used as a pressure sensor, one side of which is connected to the body 1 via an electrode, and a conductive wire 17 coming out from the electrode formed on the other side. ing.
第７図で圧力検知器の作用を示す。第６図と同
一番号のものは、同じ機能を有する構成要素であ
る。図では、導線７と１７は略いてある。ノズル
部５は、圧電素子６の径方向振動の機掛的歪によ
り備のようにたわみ運動を行う。このたわみ運動
により、加圧室２の中には図示したような圧力伝
播が発生する。この圧力変動は、圧力検知器１６
で機械的振動となり、さらに電気信号に変換され
て、前述の導線１７を介して出力される。ところ
で、噴霧液滴は加圧室２内の圧力上昇値によつて
その量が左右される。そこで、噴霧に寄与する圧
力変動が検出できる位置、すなわち、振動するノ
ズル部と対向した位置に前記圧力検知器１６を配
し、その検出信号が所定の値になるように制御す
れば、噴霧量の制御が可能である。 FIG. 7 shows the operation of the pressure sensor. Components with the same numbers as in FIG. 6 are components having the same functions. In the figure, conductors 7 and 17 are omitted. The nozzle part 5 performs a bending motion like a bell due to mechanical strain caused by the radial vibration of the piezoelectric element 6. This deflection causes pressure propagation within the pressurizing chamber 2 as shown. This pressure fluctuation is detected by the pressure sensor 16
This becomes mechanical vibration, which is further converted into an electrical signal and output via the aforementioned conductor 17. By the way, the amount of sprayed droplets depends on the pressure rise value in the pressurizing chamber 2. Therefore, if the pressure detector 16 is arranged at a position where pressure fluctuations contributing to spray can be detected, that is, at a position facing the vibrating nozzle part, and the detection signal is controlled to a predetermined value, the amount of spray can be increased. control is possible.
第８図は本発明における駆動装置の一実施例を
示すもので、駆動部１７は、発振器１２，増幅器
１３，ゲイン調節器１８から成つている。圧力検
知器１６の信号は、前記駆動部の中のゲイン調節
器に入力し、所定の値になるように前記増幅器１
３のゲインを制御している。すなわち、所定の噴
霧量になるようにノズル部を付勢する圧電素子６
への印加パワーを調整するものである。 FIG. 8 shows an embodiment of the driving device according to the present invention, and the driving section 17 is composed of an oscillator 12, an amplifier 13, and a gain adjuster 18. The signal from the pressure sensor 16 is input to the gain adjuster in the drive section, and the signal is adjusted to a predetermined value by the amplifier 1.
It controls the gain of 3. That is, the piezoelectric element 6 urges the nozzle part so that a predetermined amount of spray is obtained.
This is to adjust the power applied to the
また、第３図で示したような共振点の周波数追
尾を行う駆動回路に対して、本発明における圧力
検知器構成を用い、印加電力の制御を行うことで
さらに効率よい霧化動作を実現することができ
る。 Further, by using the pressure sensor configuration of the present invention and controlling the applied power to the drive circuit that performs frequency tracking of the resonance point as shown in Fig. 3, more efficient atomization operation can be achieved. be able to.
さらにまた、加圧室中に液体が充填されている
か歪かが、圧力検知器の変動幅を判定することに
より可能である。すなわち、空気か、液体かの判
別ができるので、ノズル部の空振動による破壊を
抑制することもできる。 Furthermore, it is possible to determine whether the pressurized chamber is filled with liquid or is distorted by determining the fluctuation range of the pressure sensor. That is, since it is possible to determine whether it is air or liquid, it is also possible to suppress damage to the nozzle portion due to empty vibration.
発明の効果
本発明の霧化装置によれば、従来提案された、
コンペクトで、しかも、小パワーで大噴霧量が得
られる特有の構成をした霧化器の加圧室中に圧力
検知器を設け、その出力信号を所定値に制御する
ことで、環境変化や経時変化による霧化器の特変
動を補償でき、安定して所定の噴霧量を霧化させ
ることができるという効果が得られる。Effects of the Invention According to the atomization device of the present invention, conventionally proposed
A pressure sensor is installed in the pressurizing chamber of the atomizer, which has a unique configuration that allows a large amount of spray to be obtained with low power.By controlling the output signal to a predetermined value, it is possible to detect environmental changes and It is possible to compensate for the special fluctuation of the atomizer due to the change, and it is possible to achieve the effect that a predetermined amount of spray can be stably atomized.
第１図は従来の霧化器の断面図、第２図は従来
の霧化器の駆動装置のブロツク図、第３図は従来
の霧化器の別の駆動装置のブロツク図、第４図は
霧化器の共振周波数の温度特性図、第５図は霧化
器のインピーダンスループ図、第６図は本発明の
霧化装置の一実施例を示す要部断面図、第７図は
本発明の霧化装置の動作を示す図、第８図は本発
明の霧化装置の一実施例を示す図である。
１……ボデイー、２……加圧室、３……液体の
供給部、５……ノズル部、６……圧電振動子、１
６……圧力検知器、１７……駆動部。
Fig. 1 is a cross-sectional view of a conventional atomizer, Fig. 2 is a block diagram of a drive device of a conventional atomizer, Fig. 3 is a block diagram of another drive device of a conventional atomizer, and Fig. 4 is a block diagram of a drive device of a conventional atomizer. is a temperature characteristic diagram of the resonant frequency of the atomizer, FIG. 5 is an impedance loop diagram of the atomizer, FIG. 6 is a sectional view of essential parts showing an embodiment of the atomizer of the present invention, and FIG. 7 is a diagram of the main part of the atomizer. FIG. 8 is a diagram showing the operation of the atomizing device of the present invention. FIG. 8 is a diagram showing an embodiment of the atomizing device of the present invention. DESCRIPTION OF SYMBOLS 1...Body, 2...Pressure chamber, 3...Liquid supply part, 5...Nozzle part, 6...Piezoelectric vibrator, 1
6...Pressure detector, 17...Drive unit.
Claims (1)
前記加圧室に液体を供給するための供給部と、前
記加圧室に臨むように設けたノズルを有するノズ
ル部と、前記ノズル部を付勢して前記ノズルを加
振する圧電振動子と、前記加圧室内に設けられた
圧力検知器と、前記圧力検知器からの信号を入力
し前記圧電振動子に駆動信号を加える駆動部とか
ら構成された霧化装置。 ２ 圧力検知器は、ノズル部と対向した位置の加
圧室内に設けられた特許請求の範囲第１項記載の
霧化装置。[Claims] 1. A body equipped with a pressurized chamber filled with liquid;
a supply section for supplying liquid to the pressurizing chamber; a nozzle section having a nozzle provided facing the pressurizing chamber; and a piezoelectric vibrator for urging the nozzle section and vibrating the nozzle. , an atomization device comprising: a pressure sensor provided in the pressurizing chamber; and a drive section that inputs a signal from the pressure sensor and applies a drive signal to the piezoelectric vibrator. 2. The atomization device according to claim 1, wherein the pressure detector is provided in the pressurizing chamber at a position facing the nozzle portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2750384A JPS60172376A (en) | 1984-02-16 | 1984-02-16 | Atomizing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2750384A JPS60172376A (en) | 1984-02-16 | 1984-02-16 | Atomizing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60172376A JPS60172376A (en) | 1985-09-05 |
| JPH0227027B2 true JPH0227027B2 (en) | 1990-06-14 |
Family
ID=12222941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2750384A Granted JPS60172376A (en) | 1984-02-16 | 1984-02-16 | Atomizing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60172376A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0931595A1 (en) * | 1998-01-26 | 1999-07-28 | Imra Europe S.A. | A device for spraying a liquid |
-
1984
- 1984-02-16 JP JP2750384A patent/JPS60172376A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60172376A (en) | 1985-09-05 |
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