JPH01123683A - Ultrasonic washing apparatus equipped with washing liquid degassing apparatus - Google Patents

Abstract

PURPOSE: To efficiently execute deaeration and to lessen the consumption of a washing liquid by installing a cooling coil above a deaeration tank for heating and deaerating the washing liquid and an ultrasonic washing tank and adopting a structure to connect these tanks with two pieces of upper and lower pipelines and to circulate the washing liquid by natural convection thereby continuously deaerating the washing liquid. CONSTITUTION: The washing liquid 7 is heated by a heating coil 3 in the deaeration tank 4 and the air included in the washing liquid 7 is deaerated by this heating and is discharged to the outside of the tank. On the other hand, the washing liquid 7 evaporated by the heating is risen and is cooled by the vapor cooling coil 9, by which the washing liquid is liquefied and is returned to the washing tank 2. The washing liquid 7 is passed between the washing tank 2 and the deaeration tank 4 by the two pipelines 5, 6 under the natural convection by the heating. The air flowing into the washing liquid 7 together with the wash is successively deaerated within the deaeration tank 4. The vapor generated by the heating is cooled by the upper cooling coil. Since this vapor stagnates on the washing liquid at all times, the contact of the washing liquid with the air is prohibited and the efficient deaeration is made possible. In addition, the consumption of the washing liquid 7 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an ultrasonic cleaning device capable of degassing a cleaning liquid.

(Prior Art) In ultrasonic cleaning, if a large amount of air is included in the cleaning liquid, the generation of intrinsic cavitation is prevented and the cleaning effect cannot be improved.

Therefore, in conventional ultrasonic cleaning apparatuses, vacuum degassing or degassing by ultrasonic vibration has been performed.

Figure 5 shows the change in sound pressure due to degassing.This sound pressure is due to the so-called cavitation noise of 100 to 500 KHz, which is said to be correlated with the cleaning effect of ultrasonic waves, due to dissolved air. The more the value decreases, that is, the more deaeration progresses, the more it increases.

To determine the cleaning effect under the above conditions, according to the aluminum foil erosion test shown in FIG. 6, the more the deaeration progresses, the more the aluminum foil will erode, and it can be predicted that the deaeration will improve the cleaning effect.

As an example of a vacuum deaeration device, an ultrasonic vibrator B is fixed to the bottom of a cleaning tank A shown in Fig. 2, and a liquid feed pump C is provided on one side to send a cleaning liquid to a deaeration pipe, thereby evacuating the deaeration pipe. It is connected to a container E, in which air is extracted by a vacuum pump F, and cleaning liquid is sent to a cleaning tank A by a liquid feeding pump G.

(The problem that Hatsuo is trying to solve) However, as shown in Figure 3, vacuum deaeration 1 improves the degree of deaeration significantly, but the equipment is complicated, and the cleaning liquid is discharged at the same time as the air. There was a problem that there was a lot of wear and tear.

In addition, in deaeration using ultrasonic vibration, as shown in Figure 3,
There was a drawback that the degree of deaeration did not improve beyond a certain level, and no improvement in the cleaning effect could be expected.

Furthermore, since the degassed cleaning liquid is in contact with air, the amount increases over time, and as shown in FIG. 4, air is mixed in, which reduces the deaeration effect.

Therefore, an object of the present invention is to provide an apparatus that can perform continuous deaeration using natural convection and can reduce consumption of cleaning liquid with a simple structure.

[Structure of the Invention] (Means for Solving the Problems) The ultrasonic cleaning device with a cleaning liquid deaerator of the present invention includes a deaeration tank that heats and degasses the cleaning liquid, and a cooling tank above the ultrasonic cleaning tank. This ultrasonic cleaning device with a cleaning liquid deaerator is characterized in that a coil is installed, both tanks are connected by two pipes, upper and lower, and the cleaning liquid is circulated and continuously degassed by natural convection.

(Function) In the present invention, the cleaning liquid flows through the cleaning tank and the deaeration tank by natural convection, and air is degassed by heating in the deaeration tank.

On the other hand, the steam generated by the heating is cooled by the upper cooling coil, and the steam always accumulates on the cleaning liquid, thereby preventing the cleaning liquid from coming into contact with the air.

(Example) An example of the present invention will be described in detail based on FIG. A cleaning tank 2 with an ultrasonic transducer l fixed to the bottom and a deaeration tank 4 with a built-in heater 3 are installed adjacent to each other, and the top and bottom of both tanks 2 and 4 are connected with pipes 5 and 6 to create a natural environment. The cleaning liquid 7 is caused to flow between the cleaning tank 2 and the deaeration tank 4 by convection.

Further, the upper sides of the cleaning tank 2 and the deaeration tank 4 are surrounded by a wall 8, and a steam cooling coil 9 is provided on the wall 8 to cool the steam of the cleaning liquid 7 and return it to liquid.

In the figure, reference numeral 10 denotes an air inflow blocking plate provided between the cleaning tank 2 and the deaeration tank 4, which prevents air from flowing into the cleaning tank 2. A cooling jacket 11 is designed to constantly cool the cleaning tank 2 by introducing cooling water or the like to lower the temperature of the cleaning liquid 7.

In this embodiment, the cleaning liquid 7 is constructed as described above, and the cleaning liquid 7 is heated by the heating coil 3 in the degassing tank 4. Due to this heating, the air contained in the cleaning liquid 7 is degassed and flows out of the tank. do.

On the other hand, the cleaning liquid 7 vaporized by heating rises, is cooled by the vapor cooling coil 9, becomes liquefied, and returns to the cleaning tank 2.

The cleaning liquid 7 is caused to flow between the cleaning tank 2 and the deaeration tank 4 through both pipes 5°6 by convection due to heating, and the air that has flowed into the cleaning liquid together with the object to be cleaned flows into the deaeration tank 4. The air is sequentially degassed inside.

[Effects of the Invention] The heating deaeration according to the present invention shows an intermediate value between ultrasonic deaeration and vacuum deaeration as shown in Fig. 3, but due to the vapor layer stagnant under the vapor cooling coil. By blocking the air, it prevents contact with the air and prevents air from entering.
A greater deaeration effect can be obtained compared to conventional deaeration means.

Further, since the cleaning liquid is not discharged unlike in vacuum degassing, there is less consumption of the cleaning liquid.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an embodiment of an ultrasonic cleaning device with a cleaning liquid deaerator according to the present invention, FIG. 2 is a cross-sectional view of a conventional device, and FIG.
The figure is a diagram showing the relationship between the deaeration means and dissolved air, and Figure 4 is a diagram showing the relationship between the contact time of the cleaning liquid and air and the dissolved air.
Figure 5 is a diagram showing the relationship between relative sound pressure and dissolved air, and Figure 6 is a diagram showing the relationship between relative sound pressure and dissolved air.
The figure shows the state of corrosion of aluminum foil due to erosion. DESCRIPTION OF SYMBOLS 1... Ultrasonic vibrator, 2... Cleaning tank, 3... Heating coil, 4... Deaeration tank, 5, 6... Piping, 7...
Cleaning liquid, 8... Wall body, 9... Steam cooling coil, 10
...Air inflow prevention plate, 11...Cooling jacket. Figure 3 (mLTL) Figure 4 Figure 5 Dissolved air frequency (in Hz)

Claims (1)

[Claims] A cooling coil is installed above the deaeration tank that heats and deaerates the cleaning liquid, and the ultrasonic cleaning tank.The two tanks are connected by two pipes, one above the other, and the cleaning liquid is circulated through natural convection for continuous deaeration. An ultrasonic cleaning device with a cleaning liquid deaerator, characterized in that: