JPS5950386B2 - Initial atomization amount stabilization method in ultrasonic liquid atomization device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for stabilizing the initial atomization amount in an ultrasonic liquid atomization device.

2. Description of the Related Art Ultrasonic liquid atomization devices emit ultrasonic waves into liquid to atomize it, and are becoming widely used for humidity adjustment and other purposes.

FIG. 1 schematically shows a general ultrasonic atomization device.

In this figure, the atomization chamber 1 has an atomization cylinder 2 that opens to the outside.
is attached, and an intake port 3 is provided to receive air from a blower fan (not shown). Further, a vibrator 4 for generating ultrasonic waves is attached to the bottom of the atomization chamber 1. This vibrator 4 is then excited by a high frequency excitation circuit 5. Power is supplied to the high frequency excitation circuit 5 from a power source 6. With the above configuration, ultrasonic waves are emitted from the vibrator 4 to the liquid A in the atomization chamber 1 to atomize the liquid.

By the way, if you start the atomization device once, stop using it for a while, and then start it up again,
The temperature of the liquid A in the atomization chamber 1, which has increased in temperature by absorbing part of the ultrasonic energy during operation, decreases after the operation is stopped, but in the process, the temperature distribution becomes uneven. For example, in the case of a liquid with good thermal conductivity such as water, the temperature is highest near the liquid surface, and the temperature decreases as it approaches the bottom. The vicinity of the vibrator 4 that emits ultrasonic waves becomes high temperature. For this reason, in the case of water, etc., a protrusion with an abnormal height ranging from several tens of centimeters to about 1 meter is generated on the liquid surface at the initial stage of starting the atomization device, and this may collide with the atomization tube 2. As shown by curve A in FIG. 2, the operation becomes unstable for several tens of seconds after the start of operation, and atomization is hardly performed. Curve B in FIG. 2 shows the case where the temperature distribution is uniform. These curves A, . As can be seen from B, in the case of water or the like, the atomization amount becomes significantly lower than the steady value for a while after the start of operation due to the non-uniform temperature distribution. On the other hand, when liquid A is kerosene or the like, as shown in Figure 3, the amount of atomization approaches a steady value after the start of operation, but after about 5 minutes, the amount of atomization begins to decrease and then recovers again. This causes the inconvenience that it takes about one hour for the atomization amount to reach the steady state value. In any case, if the temperature distribution of liquid A in the atomization chamber 1 is uneven, the amount of atomization at the initial stage of operation will be extremely unstable, so strict control of the amount of atomization is required. It is not preferred when applied to the industrial field.

In view of the above points, the present invention provides a method for stabilizing the initial atomization amount in an ultrasonic liquid atomizer, which stabilizes the atomization amount at the initial stage of the atomization operation.

Embodiments of the method for stabilizing the initial atomization amount according to the present invention will be described below with reference to the drawings.

In FIG. 4, an atomization chamber 1 having an atomization tube 2 and an intake port 3 is shown.
A stirring device 10 is provided on the side of the stirring device 1.
0 stirring blades 11 are designed to rotate in the liquid.

Further, the timer 12 is connected to the power supply circuit 6 via the power switch 13, and power is supplied to the high frequency excitation circuit 5 that drives the stirring device 10 or the vibrator 4 via the contact 12A of the timer 12. It's getting old. In the above case, when the power switch 13 is turned on, the timer 12 is activated and its own contact 12A is switched to the stirring device 10 side.

As a result, the stirring device 1
0 operates, and the stirring blade 11 stirs the liquid A in the atomization chamber 1. After a predetermined period of time, the timer contact 12A is switched to the high frequency excitation circuit 5 side. The vibrator 4 is then driven by the high frequency excitation circuit 5, and ultrasonic waves are emitted into the liquid A to start the atomization operation. At this time, since liquid A has been stirred in advance and the temperature distribution is uniform, the atomization amount immediately reaches a steady value, eliminating instability in the atomization amount at the beginning of the atomization operation caused by uneven temperature distribution. It is possible. FIG. 5 shows another embodiment of the invention. In this figure, the atomization chamber 1
A circulation path 20 is provided between the upper and lower portions of the side wall, and a forced circulation pump 21 is inserted in the middle of this circulation path 20. The other configurations are the same as in FIG. 4. According to this embodiment, the liquid A can be forcibly circulated from the bottom to the top of the atomization chamber 1 (or in the opposite direction) before the start of the atomization operation, thereby making the temperature distribution of the liquid A uniform. Therefore, as in the case shown in FIG. 4, it is possible to generate a stable amount of atomization immediately after the start of the atomization operation. As described above, according to the method of the present invention, the temperature distribution of the liquid in the atomization chamber can be made uniform, so that the initial atomization amount after the start of the atomization operation can be stabilized.

[Brief explanation of drawings]

Fig. 1 is a block diagram showing a general ultrasonic liquid atomization device, Figs. 2 and 3 are graphs showing an example where the initial atomization amount is unstable, and Fig. 4 is an ultrasonic liquid atomization device according to the present invention. A block diagram showing an embodiment of a method for stabilizing the initial atomization amount in a liquid atomization device, and FIG. 5 is a block diagram showing another embodiment of the present invention. 1... Atomization chamber, 4... Vibrator, 5... High frequency excitation circuit, 6... Power supply circuit, 10... Stirring device, 12... Timer, 20... Circulation path, 21...
pump.

Claims (1)

[Claims] 1. Ultrasonic liquid atomization in which an ultrasonic generation vibrator is attached to the bottom of the atomization chamber, and this vibrator is driven by an excitation circuit to atomize the liquid in the atomization chamber by ultrasonic waves. In the device,
A stirring device is provided in the atomization chamber, and before the vibrator is activated to start the atomization operation, the stirring device is activated for a predetermined period by a timer to equalize the temperature distribution of the liquid. A method for stabilizing the initial atomization amount in an ultrasonic liquid atomization device. 2. In an ultrasonic liquid atomization device, an ultrasonic generation vibrator is attached to the bottom of the atomization chamber, and this vibrator is driven by an excitation circuit to atomize the liquid in the atomization chamber by ultrasonic waves. A circulation path is provided between the upper and lower parts of the atomization chamber, and a pump for forced circulation is inserted in the middle of the circulation path. 1. A method for stabilizing the initial atomization amount in an ultrasonic liquid atomization device, characterized in that the temperature distribution of the liquid is made uniform by operating a pump to forcefully circulate the liquid.