JPH081118A - Ultrasonic cleaning device - Google Patents

Abstract

PURPOSE:To adjust a cleaning liquid stored in a cleaning tank to a specified degree of deaeration so that an optimal ultrasonic intensity is applied to an object to be cleaned. CONSTITUTION:This ultrasonic cleaning device consists of a deaeration means 2 for vacuum-deaerating a cleaning liquid stored in a cleaning tank 1, a cleaning liquid reflux line 5, equipped with a cleaning liquid feed line 3 and a pump 4, which connects the deaeration means 2 to the cleaning tank, and a vacuum suction line 7 communicating with a vacuum pump 6, and a vacuum pressures sensor 8 which are connected to the deaeration means 2. In addition, the vacuum pressure sensor 8 is connected to the vacuum pump 6 by a circuit 9. Further, a controller 10 which controls the ON/OFF operation of the vacuum pump 6 based on the detection reading of the pressure sensor 8 is interposed halfway through the circuit 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultrasonic cleaning apparatus, and more specifically, it adjusts a dissolved gas in a cleaning liquid to a predetermined degassing degree according to the type of an object to be cleaned to improve the cleaning effect. It is a thing.

[0002]

2. Description of the Related Art As is well known, it is known that in an ultrasonic cleaning apparatus, the strength of ultrasonic waves is weakened by a dissolved gas contained in the cleaning liquid, so that the cleaning effect is lowered.
Therefore, the cleaning liquid is degassed and supplied. However, as shown in FIG. 4, in the case of tap water, for example, the sound pressure level indicating the strength of ultrasonic waves changes depending on the degassing degree, and cleaning is performed. Since the strength also changes, it was found from the test results that the cleaning quality varies depending on the type of the object to be cleaned, which causes a problem. Therefore, it is necessary to adjust the degassing degree of the cleaning liquid so that the ultrasonic intensity of the object to be cleaned is ultrasonically adjusted. However, the conventional deaerator does not operate by adjusting the degree of deaeration within a predetermined range, and operates at the minimum pressure according to the capacity of the vacuum pump. In this case, the vacuum pump always operates continuously, the ultimate vacuum pressure fluctuates depending on the flow rate of the degassed liquid and other conditions, and the degassing degree also fluctuates.

[0003]

SUMMARY OF THE INVENTION The present invention is capable of easily adjusting the degassing degree of a cleaning liquid within a predetermined range in order to give an optimum ultrasonic wave intensity to an object to be cleaned in ultrasonic cleaning. An object is to provide a sonic cleaning device.

[0004]

That is, the present invention has been made to solve the above-mentioned problems, and is provided with deaeration means for vacuum deaeration of the cleaning liquid stored in the cleaning tank of the ultrasonic cleaning device. A cleaning liquid supply line and a cleaning liquid recirculation line equipped with a pump are connected between the deaeration means and the cleaning tank, and a vacuum suction line and a vacuum pressure sensor communicating with a vacuum pump are connected to the deaeration means. The vacuum pressure sensor and the vacuum pump were connected by a line, and a controller for controlling ON / OFF of the vacuum pump was inserted in the middle of the line based on the detection value of the vacuum pressure sensor. It is characterized by that.

[0005]

According to the present invention, the vacuum pressure in the degassing means is set so that the cleaning liquid has a degassing degree within a preset predetermined range, and the vacuum is generated based on the detected vacuum pressure value in the degassing means. Run the pump and stop the vacuum pump when the vacuum pressure reaches the set value. The vacuum pressure is increased by the degassed gas from the time when the vacuum pump is stopped, and when the vacuum pressure reaches a predetermined vacuum pressure, the vacuum pump is operated again, and this cycle is repeated thereafter. By repeating this, the cleaning liquid maintains a predetermined degree of degassing.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of an ultrasonic cleaning device (an ultrasonic generator and the like are omitted) that implements the present invention. In the figure, reference numeral 1 denotes a cleaning tank of the ultrasonic cleaning apparatus, which stores a predetermined cleaning liquid. Reference numeral 2 denotes a deaeration tower applied as a deaeration means, which includes the lower surface of the cleaning tank 1 and the deaeration tower 2
Is connected by a cleaning liquid supply line 3 and a spray nozzle 3a is inserted at the tip end, and the lower surface of the degassing tower 2 and the cleaning tank 1 are connected by a cleaning liquid recirculation line 5 equipped with a pump 4, The cleaning liquid in the tank 1 is circulated in the degassing tower 2 to form a cleaning liquid having a predetermined degree of degassing.

As a means for vacuum degassing the inside of the degassing tower 2, for example, a water-sealed vacuum pump 6 is provided, and the vacuum pump 6 and the upper part of the degassing tower 2 are connected by a vacuum suction line 7. Then, below the connecting portion of the vacuum suction line 7, a vacuum pressure sensor 8 for detecting the vacuum pressure in the degassing tower 2 is inserted,
A line 9 connects the vacuum pressure sensor 8 and the vacuum pump 6, and the vacuum pressure sensor 8 is provided in the middle of the line 9.
The controller 10 for turning ON / OFF the operation of the vacuum pump 6 in response to the detection signal is inserted. In the figure, 11 is a closed channel
2 is an exhaust passage. The vacuum pressure sensor 8 is preferably a semiconductor pressure sensor capable of continuously setting the pressure range.

A method of adjusting the degree of deaeration of the cleaning liquid in the ultrasonic cleaning apparatus having the above structure will be described. If the object to be cleaned (eg, aluminum foil) to be cleaned by the ultrasonic cleaning device is very likely to be damaged, it is necessary to adjust the ultrasonic intensity to prevent the object to be cleaned from being damaged. FIG. 2 shows, for example, that tap water is used as the cleaning liquid, and the dissolved gas concentration (DO value) of this tap water is 8 ppm.
FIG. 3 is a diagram showing the relationship between the vacuum pressure in the degassing tower 2 and the DO value and degassing efficiency in the case of FIG. Air tower 2
If the internal vacuum pressure is set to, for example, 200 torr to 250 torr, the degassing efficiency is about 70% and the DO value is about 2 ppm or more, as shown in the figure. It should be noted that this value is constant even in the case of circulating water from the cleaning layer 1 supplied to the degassing tower 2 (having different degrees of degassing).

Then, the vacuum pressure of 200 torr to 250 torr is applied to the controller 10 for turning on and off the operation of the vacuum pump 6 according to the detection signal of the vacuum pressure sensor 8.
By setting the operating range of the vacuum pump 6 so that it is turned on and off at (see FIG. 3), the cleaning water having a predetermined degree of degassing is stored in the cleaning tank 1 and the object to be cleaned has an optimum ultrasonic intensity. Can be washed.

In the above embodiment, as the degassing means,
Although the case of using the degassing tower system has been described, the present invention is not limited to this embodiment, and the same operational effect can be obtained by the membrane degassing system. Therefore, depending on the implementation, it is also preferable to use a membrane degassing system as the degassing means.

[0011]

As described above, according to the present invention, the degassing means for vacuum degassing the cleaning liquid stored in the cleaning tank of the ultrasonic cleaning device is provided, and the degassing means and the cleaning tank are provided. Between the cleaning liquid supply line and the cleaning liquid recirculation line equipped with a pump to detect the vacuum pressure in the degassing means,
Since the vacuum pump is controlled to be turned on and off based on this detected value, it is possible to store a cleaning liquid having a predetermined degree of degassing that can give optimum ultrasonic intensity to the object to be cleaned in the cleaning tank. it can. Therefore, the cleaning effect can be improved without damaging the object to be cleaned. Further, since the vacuum pressure control of the deaeration means is controlled by turning on and off the vacuum pump, the energy saving effect is large as compared with the conventional vacuum pump continuously operated.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an ultrasonic cleaning device embodying the present invention.

FIG. 2 is a diagram showing the relationship between the vacuum pressure in the degassing tower of FIG. 1, the DO value, and the degassing efficiency.

FIG. 3 is an explanatory diagram showing an operation range in which the vacuum pump is ON / OFF controlled by a detection signal of the vacuum pressure sensor of FIG. 1.

FIG. 4 is a diagram showing a change in sound pressure level due to deaeration of a cleaning liquid (tap water).

[Explanation of symbols]

 1 Cleaning Tank 2 Degassing Means (Degassing Tower) 3 Cleaning Liquid Supply Line 4 Pump 5 Cleaning Liquid Reflux Line 6 Vacuum Pump 7 Vacuum Suction Line 8 Vacuum Pressure Sensor 9 Circuit 10 Controller

Claims (1)

[Claims] 1. A degassing means 2 for vacuum degassing a cleaning liquid stored in a cleaning tank 1 of an ultrasonic cleaning apparatus is provided, and a cleaning liquid supply line 3 and a pump are provided between the degassing means 2 and the cleaning tank 1. A vacuum suction line 7 communicating with a vacuum pump 6 and a vacuum pressure sensor 8 are connected to the degassing means 2 by connecting a cleaning liquid recirculation line 5 equipped with the cleaning liquid reflux line 5, and the vacuum pressure sensor 8 and the vacuum pump 6 are connected. And a controller 10 for controlling ON / OFF of the vacuum pump 6 based on a detection value of the vacuum pressure sensor 8 is inserted in the middle of the line 9. Sonic cleaning device.