JPH0739833A - Detergent - Google Patents

Abstract

PURPOSE:To increase cleaning effect by positively removing gaseous portion from the surface of a material to be cleaned or a cleaning solution and penetrating the cleaning solution into the fine gap of the material to be cleaned. CONSTITUTION:The gaseous portion is positively removed from the surface of the material 16 to be cleaned or the cleaning solution 15 and the cleaning solution 15 is penetrated into the fine gap of the material 16 to be cleaned by constituting so as to be provided with a controller 6 for operating a pump 7 to charge or discharge the cleaning solution 15 based on a pressure detected by a pressure sensor 5 for detecting the pressure in the cleaning vessel 1 and a nozzle 13 for injecting the cleaning solution 15 into the cleaning vessel 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention uses a liquid detergent to
The present invention relates to a cleaning device for cleaning precision parts and the like having minute gaps on the surface.

[0002]

2. Description of the Related Art In recent years, chlorofluorocarbon, which has a high performance, cannot be used as a cleaning agent, and various alternative cleaning methods have been proposed.

However, although water has an advantage that it can be easily handled as a cleaning liquid, it has a drawback that it has a very high surface tension and does not easily penetrate into minute gaps. On the other hand, due to the miniaturization of products, the parts used are also miniaturized, and the parts have many small gaps. Even cleaning agents that reduce normal surface tension can be used to clean small gaps. It has become difficult to penetrate the agent.

Further, when cleaning is performed, it is general to add a mechanical / physical contact assisting force to the cleaning agent and the object to be cleaned to enhance the cleaning effect. One of the methods of using this auxiliary force is to remove bubbles by applying air bubbles to the object to be cleaned. For example, by depressurizing the sealed cleaning tank and heating the cleaning tank at the same time, cleaning is performed. There is a method in which air bubbles are generated in the tank and on the surface of the object to be cleaned and used as an assisting force for cleaning (see JP-A-61-109567).

Further, there are several methods of controlling the bubbles by pressurizing and depressurizing the cleaning tank in order to positively utilize the generated bubbles. For example, a gas is once mixed with water and the mixture is pressurized. A gas is dissolved in water by applying a water vapor, and then fine air bubbles generated by releasing the water into the water tank while decompressing the water are applied to the object to be cleaned together with the water flow to clean the air (Japanese Patent Laid-Open No. 59-1652).
(See Japanese Patent Laid-Open No. 7), the gas is once mixed with water, the water is supplied to a closed cleaning tank, and the cleaning tank is pressurized to once dissolve the gas in water, and then the pressure is reduced. A cleaning device in which dissolved gas is deposited as fine bubbles and the bubbles are applied to the surface of the object to be cleaned (see Japanese Patent Laid-Open No. 62-191090).
Etc.

[0006]

However, in the above-described conventional cleaning method and cleaning apparatus, if the object to be cleaned on which the generated air bubbles are applied is flat, it can be expected that dirt will be removed. In the case of precision parts, etc., where bubbles are unlikely to enter the gap due to the effect of the surface tension of the liquid, and when bubbles are found in the gap, it is difficult to remove them conversely. Collecting them to form large bubbles, the air may be trapped in the gap, and it may become difficult for the cleaning liquid to enter, leaving the gap unwashed.
In particular, when water is used as the cleaning liquid, the surface tension is large, so that this phenomenon is prominent.
The gas dissolved in the cleaning liquid has a problem that the impact force of cavitation is weakened in ultrasonic cleaning, which becomes an obstacle to cleaning.

The present invention solves the above-mentioned problems of the prior art. It is possible to positively remove gas components from the surface of the object to be cleaned or the cleaning liquid, and to permeate the cleaning liquid into minute gaps in the object to be cleaned. It is another object of the present invention to provide a cleaning device that can improve the effect of ultrasonic cleaning.

[0008]

In order to achieve this object, a cleaning apparatus of the present invention is based on a cleaning tank having a closed structure, a pressure sensor for detecting the pressure in the cleaning tank, and a pressure sensor for detecting pressure. And a controller for operating the pump to send and discharge the cleaning liquid, and an ultrasonic vibrator for irradiating the nozzle to inject the cleaning liquid into the cleaning tank or the object to be cleaned with ultrasonic waves.

[0009]

In this structure, when the pressure in the cleaning tank is reduced,
Due to the precipitation and expansion of the dissolved gas, the gas protrudes from the minute gaps, and the surface tension imparts buoyancy to the bubbles adhering to the surface of the object to be cleaned, making it easier to separate from the surface. Shrinks the gas in the cleaning liquid,
This has the effect of reducing the contact area of the bubbles that enter the gap and have a large contact area with the object to be cleaned, and the fine bubbles are removed by stirring the cleaning liquid or the like.

[0010]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the cleaning tank 1 includes a closed lid 2
The gas is passed through the gas separation membrane 4 when the pressure in the cleaning tank 1 rises from the exhaust valve 3 provided on the sealing lid 2 and the gas can be discharged.

A pressure sensor 5 is arranged on the wall surface in the cleaning tank 1 and is connected to a controller 6. Controller 6
The pump 7 operated by is connected to the pipe 8 connected to the cleaning tank 1, and further connected from the pump 7 to the water tank 10 through the pipe 9. The liquid stored in the water storage tank 10 is opened by opening the valve 11 so that the pipe 12
Can be drained arbitrarily. Further, the cleaning liquid 15 in the cleaning tank 1 can be jetted to the object to be cleaned 16 by the pump 14 from the nozzle 13 arranged in the cleaning tank 1.

As shown in FIG. 2, the exhaust valve 3 has an exhaust port 17
It is supported inside by struts 18 and is configured so that liquid cannot pass through by the gas separation membrane 4 on the inlet side of the exhaust valve 3.

The operation of the cleaning apparatus constructed as above will be described below. Cleaning solution 15 in the cleaning tank 1
Is filled with the material 16 to be cleaned, the sealing lid 2 is closed, the inside of the cleaning tank 1 is sealed, and the cleaning liquid 15 in the cleaning tank 1 is
By the pump 7 operated by the controller 6, the water tank 1
Discharge to 0. Simultaneously with the discharge, the cleaning liquid 15 is sent to the nozzle 13 by the pump 14, and the high-speed water stream is jetted from the nozzle 13 to the object to be cleaned 16. The controller 6 detects the pressure in the cleaning tank 1 by the pressure sensor 5, and when the pressure reaches a predetermined pressure, the controller 6 stops the discharge to the water storage tank 10. At this time,
As shown in FIG. 3A, the air 20 remaining in the minute gap 19 of the object to be cleaned 16 expands as shown in FIG.
The protruding air 20 is removed by the high-speed water flow from the nozzle 13, as shown in FIG. The removed air 20 rises in the cleaning liquid 15 and floats on the surface thereof.

Next, the cleaning liquid 15 in the water storage tank 10 is sent to the cleaning tank 1 by the pump 7 operated by the controller 6. During this time, the high-speed water stream is continuously sent from the nozzle 13. The controller 6 uses the pressure sensor 5 to wash the washing tank 1
The internal pressure is detected, and when it reaches a predetermined pressure, the delivery to the cleaning tank 1 is stopped. At this time, as shown in FIG.
The air 20 remaining in the minute gaps 19 of the object to be cleaned 16
Contracts due to an increase in pressure and draws the cleaning liquid 15 into the gap 19. As shown in FIG. 4B, the air 21 contracted smaller than the size of the gap 19 easily leaves the wall surface of the gap 19 and is removed by the high-speed water flow. This air 21
Rises in the cleaning liquid 15 and floats on the surface thereof.

The air 20, 21 that has been removed as described above and floated above the surface of the cleaning liquid 15 passes through the exhaust valve 3 in the process of pressurization and is discharged to the outside of the cleaning tank 1.

By repeating the process of depressurizing and pressurizing the cleaning tank 1 as described above a predetermined number of times, the air in the gap 19 is removed from the surface of the article 16 to be cleaned, and instead the gap 1 is replaced.
The cleaning liquid 15 permeates into 9 to clean the inside of the gap 19.

As described above, according to this embodiment, the exhaust valve 3
By providing a pressure / decompression means for the cleaning liquid 15 and a controller 6 for controlling the pressure / decompression means by a pressure sensor 5 for detecting the pressure in the cleaning tank 1, the cleaning liquid 15 having a closed structure having To be cleaned 1 caused by pressurizing and depressurizing
The bubbles on the surface of No. 6 and the dissolved gas deposited as bubbles from the cleaning liquid 15 can be removed together with the dirt on the surface of the object to be cleaned 16, and the cleaning can be performed while removing the bubbles in the cleaning liquid 15.

In this embodiment, the dirt and bubbles are removed at a high speed, but they may be removed by ultrasonic vibration.

(Second Embodiment) A second embodiment of the present invention will be described below.

The feature of this embodiment is that the exhaust valve 3 having no gas separation membrane 4 in the structure of the first embodiment is used.

The operation of the cleaning apparatus constructed as above will be described below. Cleaning liquid 1 in water tank 10
When the gas passes through the exhaust valve 3 and when the liquid passes through the exhaust valve 3 in the process of pressurizing the cleaning tank 5 to the cleaning tank 1 by the pump 7 operated by the controller 6, Since the pressure of the cleaning liquid 15 differs due to the difference in the flow resistance of, the pressure sensor 5 detects this pressure change and stops the pump 7 at the moment when the cleaning liquid 15 passes through the exhaust valve 3. Therefore, the cleaning liquid 1 in the cleaning tank 1
The outflow of 5 is minimized.

Since the effect of this embodiment is similar to that of the first embodiment, its explanation is omitted. (Embodiment 3) A third embodiment of the present invention will be described below.

The feature of this embodiment is that, in the structure of the above-described first embodiment, the exhaust valve 3 is, as shown in FIG. 5, an air chamber 23 supported by a column 22 instead of the gas separation membrane 4. The exhaust valve 3 has a point.

The operation of the cleaning apparatus having the above structure will be described below. Cleaning solution 15 in cleaning tank 1
When the liquid level rises and approaches the exhaust valve 3, the air chamber 23 is lifted to block the exhaust port 17 and prevent the cleaning liquid 15 inside from leaking to the outside.

Since the effect of this embodiment is similar to that of the first embodiment, its explanation is omitted. (Fourth Embodiment) A fourth embodiment of the present invention will be described below.

As shown in FIG. 6, the feature of this embodiment lies in that, in the configuration of the above-described first embodiment, the oscillator 24 outside the cleaning tank 1 is provided in the cleaning tank 1 instead of the nozzle 13 and the pump 14. An ultrasonic transducer 25 driven by the
The point is that it is possible to irradiate ultrasonic waves.

In addition to the same effects as those of the first embodiment, the cleaning apparatus configured as described above reduces the dissolved gas in the cleaning liquid 15 to improve the effect of cavitation when ultrasonic cleaning is performed. be able to.

[0029]

As is apparent from the above description, according to the present invention, the pressure sensor for detecting the pressure in the cleaning tank and the pump operated based on the pressure detected by the pressure sensor to send and discharge the cleaning liquid. A controller, a nozzle for injecting the cleaning liquid into the cleaning tank, or an ultrasonic vibrator for irradiating ultrasonic waves to the object to be cleaned, actively removes gas from the surface of the object to be cleaned or the cleaning liquid. Thus, it is possible to realize an excellent cleaning device that can allow the cleaning liquid to penetrate into the minute gaps of the object to be cleaned and can enhance the effect of ultrasonic cleaning.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a cleaning device according to a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an exhaust valve of the cleaning device.

FIG. 3 is a schematic cross-sectional view showing the behavior of air in a minute gap on the surface of the object to be cleaned during the depressurization process of the cleaning device.

FIG. 4 is a schematic cross-sectional view showing the behavior of air in a minute gap on the surface of the object to be cleaned during the pressurizing process of the cleaning device.

FIG. 5 is an enlarged sectional view of an exhaust valve of a cleaning device according to a third embodiment of the present invention.

FIG. 6 is a schematic configuration diagram of a cleaning device according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 Cleaning Tank 3 Exhaust Valve 5 Pressure Sensor 6 Controller 7 Pump 13 Nozzle 15 Cleaning Liquid 23 Air Chamber 24 Oscillator 25 Ultrasonic Transducer

Claims (4)

[Claims] 1. A cleaning tank having a closed structure, a pressure sensor for detecting the pressure in the cleaning tank, and a controller for operating a pump based on the pressure detected by the pressure sensor to send and discharge the cleaning liquid. A cleaning device comprising a nozzle for injecting the cleaning liquid into the cleaning tank. 2. A cleaning tank having a closed structure, a pressure sensor for detecting a pressure in the cleaning tank, and a controller for operating a pump based on the pressure detected by the pressure sensor to send and discharge the cleaning liquid. A cleaning device provided with an ultrasonic transducer arranged in the cleaning tank driven by an oscillator. 3. The cleaning tank is provided with an exhaust valve for discharging the gas accumulated above in the cleaning tank and preventing the gas outside the cleaning tank from entering the cleaning tank. The cleaning device according to 2. 4. The cleaning apparatus according to claim 3, wherein the exhaust valve has an air chamber that prevents the liquid in the cleaning tank from leaking to the outside.