JPS59199074A - Atomizing device - Google Patents

Abstract

PURPOSE:To permit easy control in changing spraying rate simply by changing merely the operating time ratio of a driving signal by combining a voltage control within the normal range of the oscillating pattern of an oscillating body and a duty control. CONSTITUTION:A driving section which transmits a signal for driving the atomizer 9 of an atomizing device at a prescribed frequency, a duty control section 15 which changes the ratio between the operating time and stopping time of the driving section and an amplitude control section 16 which controls a voltage value or current value are provided. The ratio of the electric power to be impressed on a piezo-electric element is controlled by the simple operation of merely changing the operating time ratio of the driving signal at the prescribed frequency ratio and since the spraying rate shows a proportional change with a change in the duty, the change in the spraying rate is made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to liquid fuels such as kerosene and light oil. water. The present invention relates to a liquid atomization device that atomizes a medicinal solution, recording liquid, etc. using an electric vibrator.

Structures of conventional examples and their problems Many excellent liquid atomization devices have been proposed in the past, and many ultrasonic atomization devices using electric vibrators such as piezoelectric elements are also seen. Various means have also been proposed for controlling the amount of spray.

For example, (1) means for driving at a predetermined oscillation frequency and changing the driving voltage value according to the amount of spray, or the ratio of the operating time to the operating stop time of an amplifier that amplifies the signal from the ultrasonic oscillator. There are means for controlling the output energy of the ultrasonic transducer from flJt7 by changing .

However, the above conventional spray amount control means had the following problems.

The driving voltage method (1) utilizes the voltage characteristics of the spray amount as shown in Figure 1, where the horizontal axis represents the voltage applied to both ends of the vibrator and the vertical axis represents the spray amount. ing. As the pressure of the drive box is increased, 1 mist starts from Va(v), maximum spray is obtained at Vb(v), and then ′′(
:i If the flies are removed from the soil, the amount of mist will decrease. The conversion of electrical energy into mechanical energy is regulated so that the efficiency of the predetermined 1 x 1 fog is also high, so from Vb (v) to Va ( If the voltage is lowered between v) and the spray voltage is reduced by +4, the conversion efficiency will drop significantly or the vibration pattern of the vibrator will become eccentric, resulting in an unstable spray condition. was there.

The duty control means (2) for changing the ratio between the operating time and the non-operating time of the amplifier is performed by the method shown in FIG. (a) shows the driving signal applied to both ends of the vibrator when the operation stop time is zero, and the predetermined oscillation frequency signal is in a peak-to-peak state of vl. (b
), the operation time of the amplifier is equal to the T2 period in the period T1, and the spray amount is controlled by changing the T2 period. The characteristics obtained by this means are shown in FIG.

The horizontal axis is the ratio of operating time, that is, duty control "2-
7/T, (the vertical axis represents the spray amount ratio ``qmax (death). Ll is the aforementioned Chuty ratio and 1゛). L2
As shown in , 41IV1 has a large downward belly at a tutee ratio of 70 to 80%. This is a case where drive signals with the same peak and peak voltage v1 are separated by time as shown in Fig. 2 (b) by Tutei ifi control, and considered in terms of human power power ratio, and the drive signal is divided by the operating time. In addition, the amount of spray may decrease due to a delay in the response of the vibrating body at the starting temperature, or the characteristics shown in FIG. 3 may occur in the amount of spray due to the inertia of the flow of the liquid that is the load. The characteristics shown in Figure 3 have the problem of requiring complicated methods both when controlling the spray amount and when reducing and managing the spray capacity of the atomizer. was.

OBJECT OF THE INVENTION The present invention eliminates such conventional drawbacks, and by combining voltage control within the normal range of the vibration pattern of the vibrating body and duty control, the duty ratio T2 can be reduced.
By creating a proportional relationship between /T and the spray amount ratio -max (%), it is easy to control the amount of atomization. The purpose is to realize sexuality.

Structure of the Invention In order to achieve these 11 objectives, the present invention provides a body equipped with a pressurized chamber filled with a liquid as a load, and a body equipped with a pressurized chamber filled with liquid as a load.
a supply section for supplying night rest; a nozzle section having a nozzle facing the pressurizing chamber; an atomizer, a drive section that transmits a signal to drive the atomizer at a predetermined oscillation frequency, and a duty control section that changes the ratio of the operating time and stop time of the AiJ drive section;
An amplitude control section is provided for controlling the amplitude of the drive signal, that is, the voltage value or current value.

With this configuration, a signal amplitude different from the drive signal amplitude when the stop time is zero is applied to the electric vibrator of the atomizer during Tutee control in which the drive signal has a stop time.

In other words, it simulates the effect of amplitude modulation.

DESCRIPTION OF EMBODIMENTS Referring to FIG. 4, an atomizer which is an embodiment of the present invention will be described. A body 2 equipped with a pressurized chamber 1 filled with liquid is defined by several screws 3 and 4 KIMI.

The liquid enters the pressurizing chamber 1 through the supply pipe 5, and during the atomization operation, the vibro for gas discharge is filled halfway. , 17 is a nozzle portion disposed facing one part hj of the pressurizing chamber 1, and its outer periphery is joined to the body 2.

At the center of the nozzle part, a spherical projection 8 having a fine hole for ejecting droplets is formed. Further, an annular electric vibrator, here a piezoelectric element 9, is attached to the nozzle element. This piezoelectric element 9 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. 10il-11, a lead wire that transmits a drive signal to the piezoelectric element 9, one half is glued to one electrode cloth of the piezoelectric element 9, and the other is attached to the body 2 Heavis 11
connected with. When the mechanical vibration of the piezoelectric element 9 is excited by the drive signal, the nozzle part γ is also urged and vibrates, so that the liquid in the pressurizing chamber 1 is discharged as atomized particles 12 as a result.

By the way, the liquid to be supplied to the pressurizing chamber 1 may be filled in the middle of the front FjL gas outlet in the atomizer installation configuration, but as an alternative, in the atomizer installation configuration, When the chamber 1 and the exhaust vibro '1 are empty, and before entering the droplet ejection sequence, negative pressure may be applied, for example, through the exhaust vibro to fill the pressurizing chamber 1 with liquid, and at the same time, the exhaust vibro 1 may be used to pull up the liquid.

According to the latter method, impurities in the liquid solidify at the nozzle hole, resulting in K1. The problem of not being able to drop M does not occur.

FIG. 5d is a block diagram of the atomization device of the present invention;
A) has an external oscillating section 13, and its oscillating signal is amplified through an amplifying section 14 and transmitted to the piezoelectric element 9, which is a component of the atomizer, by 1%. 15 is a tutee control unit, (a
) controls the operation/stop of the excavation section signal. Reference numeral 16 denotes an amplitude modulation section which controls the voltage value applied to the piezoelectric element A from the amplification section.

(b) 1. The resonant signal of the atomizer 9 itself is taken out by the current detection part 1, controlled by the control part 15, and fed back to the amplifier part 14 through the opening/closing part 18, and is self-excited. This constitutes the oscillation drive section of the oscillation drive section.

FIG. 6 shows the amplitude modulated 7'L/ζ drive waveform, where (a) shows the case where the voltage with the same peak and peak voltage v2 is applied at the operating time T27, and (b) shows the case where the voltage with the same peak and peak voltage v2 is applied7. ■3 peak at the beginning of the operating time. Peak voltage and pressure are added,
After 72 hours, the peak voltage of v4 is applied. That is, because of the same peak as shown in FIG. 2(b), a larger force of gravity is applied to the driving waveform shown in the 61st line.

FIG. 7 shows the relationship between the Tudy ratio and the spray amount ratio by the atomization device of the present invention, and as shown by L3, it is very close to the proportional relationship of Ll, and can be said to be almost proportional.

FIG. 8 is a specific circuit configuration diagram of another embodiment of the present invention. Items with the same number as the previous one have the same function ((
? It is a perfect element. Reference numeral 19 is a power supply for the circuit, which supplies power to each block. It consists of 16 swing shafts (with a control unit, sub-beam 20, transistor 21, resistors 22, 23, capacitor 24, and reference voltage 25, and has a constant current bullet configuration.The movement as amplitude modulation is explained by piezoelectric The drive to element 9 stops and the load on the constant current section is only the amplifier section 14, which is quite light, so a higher voltage is generated across the capacitor 24 than during continuous drive. Then, drive +1jl is connected to piezoelectric element section or load and 17
The discharge at both ends of Konohunza'P11jE decreases in the form of 7. This situation is shown in the above-mentioned FIG. 6(b), and the amplitude modulation signal 1. I can see how it is. 14 amplifier sections (d, transistors 26, 27, 28, 29 .
Capacitor 3Q, 31. Resistors 32, 33, 34, 35,
It consists of 36°37.38. A resistor 53 is for current detection. The opening/closing part of 18 is FET39 and resistance 40°4
1, and is incorporated as a switch element in the transmission path of the feedback signal from the current detector. 16 is a duty control section, which includes operational amplifiers 42, 43, transistors 44. Capacitor 46, 411: Anti-46, 47, 48,
49, 50, 51. It consists of tjJ variable resistance resistor 52,
Duty ratio T2. /, , - controlled by the variable resistor 62.

By the way, the amplitude value (for example, voltage value V3) controlled by the amplitude modulation section changes depending on the tutee ratio V, and can be changed by appropriately selecting the capacitance value of the H capacitor 24 in the embodiment shown in FIG. , the characteristics shown in FIG. 7 can be obtained.

In the current structure and explanation, an example was shown (Figure 3) in which when the applied force and sweat were changed proportionally, the spray amount did not change proportionally and had a downward slope (Fig. 3). Conversely, even in the case where the spray amount has an upward antinode, it is possible to obtain a spray amount change habit +1- proportional to the tuteity ratio of the operating time by combining the tuteity and amplitude modulation.

Effects of the Invention According to the atomization device of the present invention, the power ratio applied to the piezoelectric element can be adjusted by simply changing the operating time ratio (duty ratio 2/T) of the drive signal at a predetermined oscillation frequency. is controlled and the spray amount shows a change proportional to the duty change, so the spray amount change pipe 1! It also becomes very easy.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram showing the relationship between the voltage applied to the piezoelectric element and the amount of spray, Figure 2 a and b are applied waveform diagrams showing continuous drive and intermittent operation during tutee control, and Figure 3 is a conventional waveform diagram. FIG. 4 is a diagram showing the configuration of an atomizer according to an embodiment of the present invention.
is a block diagram of the atomization device, Fig. 6a, bll-i
FIG. 7 is a diagram showing the waveform of the amplitude-modulated drive signal, FIG. 7 is a characteristic diagram showing the relationship between the Tutey ratio and the amount of spray by the atomizing device, and FIG. 8 is a circuit diagram of the same. 1... Pressure chamber, 2... Body, 6...
...Supply section, 7...Nozzle section, 9...
...Piezoelectric element, 13.14...Oscillation section and amplification section that constitute the drive section, 15...De1-Tili
Control unit, 16... Amplitude control unit. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure tυCara picture boundary voltage (V) Figure 2 Figure 4 Figure 5

Claims (2)

[Claims] (1) A body including a pressurized chamber filled with liquid, a supply section for supplying liquid in the pressurized chamber, a nozzle section provided with a nozzle facing the pressurized chamber, and the An atomizer comprising an electric vibrator that vibrates the nozzle by urging the nozzle, a drive section that transmits a drive signal to the atomizer, and a ratio of operating time and stop time of the drive section. and an amplitude control section that controls the amplitude of the drive signal. (2) The amplitude of the drive signal controlled by the amplitude control section is
2. The atomizing device according to claim 1, wherein the atomizer is thicker during driving with a stop time by the tenity control unit than during continuous driving without a stop time of the drive unit.