JPS604714A - Atomization device - Google Patents

Abstract

PURPOSE:To reduce a thermal loss of driving energy and to obtain a sufficient volume of atomization in a smooth vibration by a method wherein a low signal driving energy in which an actual injection for atomization is not performed is kept applied even during a stopped time. CONSTITUTION:Liquid is flowed into a pressurizing chamber 1 through a supplying pipe 5 and is filled in the mid part of gas discharging pipe 6 during atomization process. At a nozzle part 7 a piezoelectric element 9 is provided. When the piezoelectric element 9 is energized by a driving signal, the nozzle part 7 is also energized to vibrate, so that the liquid in the pressurizing chamber 1 is injected in atomized particles 12. A duty control part 14 is composed of a vibrating energy control part 15 for feeding a control signal to an oscilating operation part 13 so as to vary a driving signal at the oscilating driving part 13, i.e. a vibrating energy for the piezoelectric vibrating element 9 and a timer part 16 for controlling a variable time of a driving signal level.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid atomization device that atomizes liquid fuel such as kerosene or light oil, water, chemical solution, recording liquid, etc. using an electric vibrator. .

Conventional Structures and Problems Various types of liquid atomization devices have been proposed in the past, and many of them utilize the vibration phenomenon of an electric vibrator.

In the electric vibration mode, the piezoelectric vibrator is driven to oscillate near its mechanical resonance, and the application time of the drive signal is There are some that change the ratio of stop time and stop time.

The state of this duty control is shown in FIG. (a) shows the time change of a drive waveform in which an oscillation signal is applied and stopped at a predetermined cycle. During the stop time, no drive lJJ signal is applied at all, and after a predetermined period, a steady state is reached, that is, a drive signal for actual atomization is applied. (b) is the above-mentioned (a)
This is a diagram showing a change in the amplitude of the piezoelectric vibrator corresponding to a waveform, and it can be seen that the amplitude gradually increases after the steady-state j-island drive oscillation IWJ level is applied.

(c) shows the time characteristics of the spray amount during the above-mentioned tutee control.

In this way, as shown in (b), in the conventional tutee production system, the mechanical amplitude from the stop state does not follow when the signal application starts, and it appears that the steady state 11 is reached with a predetermined time constant. I understand. That is, at the start of signal application, not all of the applied energy is concentrated in mechanical vibration, but even if a large amount of energy is applied, heat loss results. Therefore, the conversion efficiency from electricity to machinery was increased by F.
1-, If electric vibration [1], the mechanical strain on the joint was large, and the service life of 1- also remained a problem. Furthermore, as can be seen from FIG. 1(c), the envelope of the spray amount also gradually increases at the start of the confidence mark υD. In other words,
Compared to the envelope of the J waveform, it takes a very long time to reach a steady state, and when adjusting the eruption dragon using Tutee control, it is difficult to deal with time assimilation, making it troublesome to regulate the amount.

The present invention, which is the first aspect of the invention, solves the problems of the prior art, and uses tutee control to adjust the amount of atomization (sometimes by reducing the heat loss of driving energy and reducing the strain on the joints of piezoelectric vibrators. The purpose is to obtain a sufficient amount of atomization through smooth vibration.

Structure of the Invention In order to achieve this object, the present invention provides a body equipped with a pressurized chamber filled with liquid, a supply section for supplying liquid to the pressurized chamber, and a body facing the pressurized chamber iif+. an atomizer consisting of a nozzle part having a nozzle provided as shown in FIG. It is composed of an oscillation drive section that drives the electric vibrator, and a duty control section that controls the drive signal level to the electric vibrator based on a time ratio.

With this configuration, conventionally the signal level was zero during the stop time of the drive signal, but during the duty control period corresponding to the stop time, a predetermined small signal level that does not harm birds is applied to the actual spray. has.

DESCRIPTION OF EMBODIMENTS Referring to FIG. 2, an atomizer which is an embodiment of the present invention will be described. A body 2 including a pressurized chamber 1 filled with liquid is fixed to a mounting plate 4 with screws 3.

The liquid enters the pressurized chamber 1 through the supply pipe 5, and during the atomization operation, the tube 6 for discharging gas is filled halfway. 7 is a nozzle part facing one side of the pressurizing chamber 1;
The outer circle is joined to the body 2. A spherical protrusion 8 having a fine hole for ejecting droplets is formed in the center of the nozzle portion 7 . Furthermore, an annular electric vibrator, here a piezoelectric element 9, is attached to the nozzle portion 7. This piezoelectric element 9 is a piezoelectric ceramic polarized in the thickness direction,
It has electrodes on the joint surface with the nozzle and on the opposite surface. Reference numeral 10 denotes a lead wire for transmitting a drive signal to the piezoelectric element 9, one of which is soldered to one electrode surface of the piezoelectric element 9, and the other is connected to the body 2 with a helix 11. When the mechanical vibration of the piezoelectric element 90 is excited by the drive signal, the nozzle part 7 is also energized and vibrates, so that as a result, the liquid in the pressurizing chamber 1 is discharged as atomized particles 12.

Incidentally, the liquid supplied to the pressurizing chamber 1 may be filled halfway up the gas discharge tube 6 in the atomizer installation configuration, but as an alternative, the liquid supplied to the pressurizing chamber 1 may be filled in the pressurized chamber 1 in the atomizer installation configuration. The chamber 1 and the exhaust vibro may be empty, and before entering the droplet ejection sequence, negative pressure may be applied, for example, through the exhaust tube 6 to fill the pressurizing chamber 1 with liquid and to draw the liquid to the middle of the exhaust vibro.

According to the latter method, impurities in the liquid solidify at the nozzle hole and the problem of not being able to eject a full amount of liquid does not occur.

FIG. 3 shows a professional configuration diagram of the atomization device of the present invention,
A piezoelectric vibrator 9 is excited to mechanically vibrate by a signal from the oscillation drive section 13. The configuration of the oscillation drive section may be a separately excited type having an oscillator, or a self-excited type using the electrical characteristics of the piezoelectric vibrator 9. The duty control section 14 includes a vibration energy control section 15 that sends a control section to the oscillation drive section in order to vary the drive signal of the oscillation drive section, that is, the vibration energy sensitivity to the piezoelectric vibrator; Driving a
It consists of a timer part 16 that controls the variable time of the J faith level.

FIG. 4 shows the driving state according to the configuration described in -1-. (,)
is a drive waveform, and 1=10, a predetermined drive level of 5 is applied, and vibration energy necessary for actual spraying is given until t''t1. t ”' t 1 count
--t2 is the stop time in the conventional example, and in the present invention, a predetermined level of vibration energy that does not contribute to actual spraying is applied. The level that does not contribute to spraying refers to the vibrational energy applied to the piezoelectric oscillator ω that does not break the surface tension of the liquid in the nozzle spray hole. (b) is (,
) shows the amplitude change of the piezoelectric swing Jr with respect to the drive waveform,
Compared to FIG. 1(b), the rise and fall from 1-tC) to the point where the steady state is reached is very fast. Since the mechanical vibration of the piezoelectric vibrator is still excited during the short-term operation,
Immediately after applying the large amount 9 necessary for spraying, the amplitude rises smoothly and heat loss does not occur as much as in the conventional case. That is, the conversion efficiency becomes higher. Furthermore, (c) shows an envelope of the time change in the amount of spray, and it can be seen that the ability to follow the drive waveform is better than that in FIG. 1 (c).

FIG. 5 shows another embodiment of the present invention, in which (a) the drive waveform, (b) the amplitude, and (c) the spray amount are also expressed by envelopes. As can be seen in the figure (,), the conventional stopping time t
” between t 1 and t = t 2″if, t
"' is excited with a small drive signal whose level is changed at t 3. In this way, from t 1 to t
The reason why ``'t34'' is set to a smaller signal level is to make the fall of the amplitude of the cannon vibrator faster and to clarify the end of the spray in the tutee control.

Then, from t '' t 3 to t = t 2'!, there is no spraying, but a larger drive uJ is applied than during t 1 < t <' t 3, and the mechanical vibration increases from t '' t 2. is even faster. With this configuration,
As shown in (c), the ability of the spray amount to follow the drive waveform is even better.

By the way, although the small signal level is set in two stages in FIG. 5, the same effect can be obtained even if the level is changed continuously instead of in a stepwise manner.

According to the atomizing device of the present invention, the following effects can be obtained.

In tutee control, by applying small-signal drive energy at a level that does not actually spray during the conventional stop period, the mechanical amplitude of the piezoelectric vibrator becomes steady after applying the drive energy necessary for spraying. It takes less time to reach the state.

That is, it has the effect of reducing loss of electrical vibration energy as heat loss, and at the same time, reducing mechanical strain at the joints of the piezoelectric vibrators. Furthermore, since the response of the actual spray amount becomes faster, the spray amount can be easily and reliably adjusted by controlling the time ratio.

[Brief explanation of drawings]

Figures 1a, d, and c are diagrams showing time changes in drive waveform, amplitude, and spray amount by conventional duty control means, respectively;
Figure 2 is a sectional view of an atomizer showing one embodiment of the present invention;
The figure is a block diagram of the same atomizer, Figure 4 a, b, c.
5 is a diagram showing the driving waveform, vibration, and time variation of the spray amount by the same duty control means, and FIG. It is a figure showing a time change of quantity. 1... Pressure chamber, 2... Body, 5 - Supply section,
7... Nozzle part, 9... Electric vibrator, 13...
- Oscillation drive unit, 14...Duty control unit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 1θ Figure 3 Figure 4 Figure 5, tlj3尤2 Procedural amendment (ga receipt) July 1988 + Ll'] Commissioner of the Japan Patent Office 2 Name of the invention Atomizing device 3 Person who makes the arrest Month Relationship with 11'1 Patent Application Fire Pillar Location 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture 4'1 (582
) Matsushita Electric Industrial Co., Ltd. d-Representative 111 Toshihiko Shimo 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. Date of 5th Amendment Order September 27, 1980 6th Amendment [Fig. 4 a
, b, c are the figures shown. ' will be corrected as follows. ``Figure 4 shows the drive waveform by the same duty control means.

Claims (3)

[Claims] (1) A body equipped with a pressurized chamber filled with liquid, and i'
+r. A supply unit for supplying pressure to the pressurizing chamber; and a nozzle unit having a nozzle facing the pressurizing chamber;
an atomizer including an electric vibrator that energizes the nozzle section and vibrates the nozzle; an oscillation drive section that drives the electric vibrator at a predetermined frequency; 11i
A device consisting of a duty control unit that controls the level of confidence and trust in the 1J child based on time. (2) Claim 1 comprising the tutee control section that controls the ratio between the time to apply a predetermined signal level necessary for atomization and the time to apply a predetermined signal level that does not cause atomization. The atomization device according to item 1. (3) The atomizing device according to claim 2, comprising a duty control section having a plurality of predetermined small signal levels at which no atomization occurs.