JPH0568955A - Cleaning-dehydrating method - Google Patents

Abstract

PURPOSE:To make a gas dissolved in a liquid bubble under depressurization and to clean an object of cleaning in micro-level by the bubbles. CONSTITUTION:A gas-dissolving liquid 2' is supplied by a pump 8 to a cleaning tank 7 an object 1 of cleaning is put in. A pressured gas is supplied to the cleaning tank 7 through a pressure adjusting apparatus 14 and valves 15, 17. Under the pressured atmosphere, the object 1 of cleaning is immersed in the gas-dissolving liquid 2' over a prescribed period. After that, a valve 18 is opened and the cleaning tank 7 is depressized at once, so that bubbles are formed in the object of cleaning and the liquid and thus the object of cleaning is cleaned by the bubbles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing / dehydrating method applied to a washing / dehydrating machine for washing fiber materials (clothing etc.), metal parts, electronic parts and the like.

[0002]

2. Description of the Related Art Conventionally, the cleaning of fiber materials, metal parts, electronic parts, etc. is carried out by immersing them in water or an organic solvent, or by spraying the liquid and spraying it on the object to be cleaned. Therefore, cleaning has basically been performed by the interaction of the liquid and the object to be washed. Of these cleaning methods, FIG. 5 shows an example of cleaning by the interaction between the liquid 1 and the liquid 1 to be washed such as a liquid to be washed, and FIG. 6 shows metal parts. An example of cleaning by interaction between the liquid 3 and the object to be cleaned 3 that has a hard surface such as an electronic component and the liquid does not penetrate inside is shown. That is,
In the article to be washed 1 such as fibers, as shown in FIG. 5, the liquid 2 during cleaning flows on the surface of the article 1 to be washed such as fibers or collides with this, and acts on the dirt substance 4 of the article 1 to be washed such as fibers. It is considered that the cleaning progresses, and at the same time, when an external force is applied to the article to be washed 1 such as fibers, the liquid 2 moves in and out of the article 1 to be washed such as fibers, so that the washing also progresses. Is believed to be. On the other hand, in the object to be cleaned 3 such as a metal part, it is considered that the liquid 2 flows or collides with the surface to act on the dirt substance 4 on the surface and the cleaning proceeds.

The above is the most general cleaning method using a liquid, but as a special example, there is also known a method of cleaning by blowing air bubbles (generally air) 5 into the liquid 2 as shown in FIG. ing. As means for feeding the bubbles 5 by this method, air 5 is fed to the porous diffuser plate 6 of FIG. 7 by a fan, a blower, an air pump, etc., and bubbles are generated by the diffuser plate 6. Alternatively, as shown in FIG. 8, it is known that air 5 is dissolved in liquid 2 under pressure and then liquid 2 is released in cleaning tank 7 under atmospheric pressure to generate bubbles. In any case, a method is used in which bubbles are generated in the cleaning tank 7 regardless of the object to be cleaned. As an effect of such bubble cleaning, it is said that the cleaning is performed by boundary layer destruction and liquid renewal by innumerable bubbles 5 rising in the boundary layer between the objects to be cleaned 1 and 3 and the liquid 2. The cleaning effect due to such a phenomenon is limited only to the cleaning effect on the surface of each of the object to be cleaned 1 such as a fiber and the object to be cleaned 3 such as a metal part. Next, regarding the dehydration method after washing the object to be washed, in the object to be washed 1 such as fiber, the squeezing method or the centrifugation method, and in the object to be washed 3 such as metal parts, the washing tank 7
The so-called draining method by vibration after pulling up from the water or a freon solvent or the like, the draining method utilizing the difference in specific gravity by immersing in a solvent having a specific gravity larger than that of water and insoluble in each other, etc. are known and widely industrialized ..

[0004]

However, in the above-described conventional cleaning, that is, the cleaning based on the flow of the cleaning liquid on the surface of the object to be cleaned, it takes time to remove the foreign matter (that is, the cleaning) that has soaked inside the object to be cleaned. However, there is a problem in that the removal of foreign matter is incomplete or the removal of foreign matter is incomplete. Further, in the conventional dehydration method, no dehydration method utilizing the boiling phenomenon was found, and a configuration based on it was not considered.

Therefore, the present invention intends to solve the above-mentioned problems of the prior art by embodying a micro-level washing / dehydrating completely different from the above-mentioned conventional washing / dehydrating method. is there. The basic technique is to immerse the article to be washed under pressure without foaming in a liquid in which gas is dissolved under pressure in advance. For materials such as fibers that allow the liquid to be washed to penetrate into the interior, after the gas-dissolved liquid has been absorbed sufficiently into the interior, the material has a hard surface such as metal parts and electronic parts, and the liquid does not penetrate into the interior. For wash items, depressurize only after sufficiently wetting the surface, and for wash items such as fibers, by innumerable fine bubbles simultaneously foaming on the surface and inside, and in wash items such as metal parts. Is intended to be washed by similarly foaming the surface. Further, also in the dehydration, it is intended to solve the above-mentioned conventional problems by draining the liquid by weight or centrifugal force and then decompressing it for the first time to foam at once and to disperse the liquid in a mist state to complete the dehydration.

[0006]

Therefore, according to the present invention, in a container containing a liquid in which a gas is dissolved, an object to be washed is immersed in the liquid under pressure, and then the pressure in the container is reduced. It is designed to generate fine bubbles in the liquid to wash the object to be washed, and this is used as a means for solving the problem.

Further, according to the present invention, the object to be washed is immersed in the liquid under pressure in a container containing a liquid in which gas is dissolved, and then the liquid is discharged from the container to drain the object to be washed. Then, by placing this object to be washed under reduced pressure to generate fine bubbles inside or on the surface of the object to be washed, the object to be washed is dehydrated. It is a means.

[0008]

In the cleaning method of the present invention, after the article to be washed is immersed in the cleaning solution in which gas is dissolved under pressure, the cleaning solution is depressurized, and bubbles are generated inside and on the surface of the article to be washed due to the boiling phenomenon of the liquid at this time. Occurs, and foreign matter is rapidly removed. Further, in the dehydration method of the present invention, the liquid content adhering to or impregnating the object to be washed after draining is depressurized, and the liquid is vaporized and deliquored by the boiling phenomenon at this time. In this case, if the latent heat is sufficiently supplied, dehydration and drying will proceed rapidly.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of a cleaning / dehydrating apparatus according to the embodiment of the present invention. In FIG. 1, the cleaning / dehydrating apparatus according to the present embodiment is composed of three components: a pressurized gas dissolving tank 16, a cleaning tank 7 and a decompression tank 19. First, the structure and function of the equipment related to the pressurized gas dissolving tank 16 will be described. In the pressurized gas dissolving tank 16, a pump 9, a circulation pipe 11, a shower nozzle 12 and a liquid 2 for producing a gas dissolved liquid 2 ′ are provided.
Is provided with a valve 10 for supplying gas, and a cylinder 13 for supplying gas 5'is provided with a pressure regulator 14,
It is connected to a pressurized gas dissolving tank 16 via a valve 15. Next, a pressurized gas dissolving tank 16 is connected to the cleaning tank 7 via a pump 8 so that the gas dissolving liquid 2'can be sent. Further, a cylinder 13 is connected to the cleaning tank 7 through a pressure regulator 14, a valve 15 and a valve 17 so that the cleaning tank 7 can have the same pressure as that of the pressurized gas dissolving tank 16 as required. ing. Further, a decompression tank 19 for decompressing the cleaning tank 7 is connected to the cleaning tank 7 via a valve 18. In addition to this, the cleaning tank 7 is provided with a lid 23 for putting in and out the object to be cleaned 1, a valve 22 for draining liquid after cleaning, and an intake valve 25. Further, an exhaust device 21 for reducing the pressure inside the decompression tank 19 is connected to the decompression tank 19 via a valve 20, and a valve 24 and an intake valve 26 for discharging drain are also provided.
Is provided.

Next, the operation of the device will be described with reference to FIG. First, the compressed gas 5'in the cylinder 13 is the pressure regulator 14
The pressure is set to the required pressure via the valve 15 and is fed to the pressurized gas dissolving tank 16 via the valve 15. On the other hand, the pressurized gas dissolving tank 16 is provided with a valve 10, a pump 9, and a circulation pipe 1.
1, the liquid 2 is sprinkled through the shower nozzle 12, and the gas-dissolved liquid 2 ′ is produced in the pressurized gas dissolution tank 16.
The object to be washed 1 is put into the cleaning tank 7 through the lid 23, and then the lid 2
3 is closed. Next, the valve 17 is opened to introduce the gas 5 ′ into the cleaning tank 7. At this time, the air in the cleaning tank 7 has a valve 18
Open and purge the vacuum chamber 19. After that, the valve 18 is closed to equalize the pressure in the cleaning tank 7 with the pressure in the pressurized gas dissolving tank 16. Also manufactured gas-dissolved liquid 2 '
Is sent via the pump 8 to the washing tank 7 in which the object to be washed 1 is put in the lid 23 in advance. At this time, in order to maintain the pressure in the cleaning tank 7 at the same pressure as in the pressurized gas dissolving tank 16, the valve 17 is open and the valves 18 and 22 are closed. In parallel with the above steps, the decompression tank 19 is on standby with a pressure reduced to a required level by an exhaust device 21 via a valve 20.

Next, after the article to be washed 1 is sufficiently immersed in the gas-dissolved liquid 2 ', the valve 17 is closed and the valve 18 is opened.
As a result, the inside of the cleaning tank 7 is depressurized at once, and the gas-dissolved liquid 2'generates innumerable fine bubbles all at once. At this time, when the article to be washed is the article to be washed 1 such as fiber, as shown in FIG. 2, innumerable fine bubbles 5 both inside and on the surface, and in the case of the article to be washed 3 such as metal parts, Similarly, countless fine bubbles 5 are generated on the surface, and a microscopic cleaning action is generated. After cleaning valve 17 and valve 18 are closed, intake valve 25 and valve 22
Is opened and the liquid 2 (2 ') is discharged. First of all
The second wash is complete, followed by the second wash. The process is exactly the same as the first time. The number of times of cleaning is set arbitrarily, and when the total number of times of cleaning is completed, the object to be cleaned 1 is taken out with the lid 23 opened. If necessary, the intake valve 26 and the valve 24 are opened to discharge the liquid accumulated in the decompression tank 19.

The cleaning method according to the present invention has been described above. In the apparatus used in this cleaning method, the object to be cleaned 1 is immersed in the gas-dissolved liquid 2 ', drained, and then depressurized to perform the operation. It can also be used for dehydration of 1. The gas used in the present invention may be air, nitrogen gas, carbon dioxide gas, or the like. In particular, as the pressure of carbon dioxide increases, the amount of dissolution in water increases as shown in FIG. 4, and for example, 5 kg / cm ²
Under the pressure of G, carbon dioxide gas having a volume ratio of about 5 times that of water can be dissolved, and the cleaning and dehydration effects due to foaming during depressurization become remarkable. Although FIG. 1 shows an example in which the decompression tank 19 is provided,
Actually, sufficient effect can be obtained even by simply reducing the pressure by opening the atmospheric pressure. In this case, the pressure reducing tank 19 and the exhaust device 21 are not necessary. Further, this is also an example of the pressurized gas dissolving tank 16, and a liquid in which gas is previously dissolved may be manufactured by another method and supplied under pressure. In addition to water as the type of liquid that dissolves gas,
Freon-based solvents (R113 etc.), chlorine-based solvents (perchlorethylene, methylene chloride, 1.1.1 trichloroethane etc.), low boiling point liquids such as petroleum-based solvents that are widely used in dry cleaning and metal cleaning are currently available. Conceivable. Recently, alternative fluorocarbons such as R225 have been announced, and all of them can be candidates for the liquid of the present invention. Needless to say, an acid, an alkaline agent, a surfactant such as a detergent and the like can be used in combination. Further, if heating means is provided at the bottom of the cleaning tank 7 to accelerate boiling under reduced pressure and latent heat is supplied by boiling, boiling will occur more rapidly, and cleaning and draining can be performed in a shorter time.

[0013]

As described in detail above, according to the present invention, by immersing an article to be washed in a gas-dissolved liquid under pressure and then reducing the pressure, numerous bubbles are generated inside or on the surface of the article to be washed. This exerts a cleaning effect on a micro level, and it becomes possible to clean the inside and the surface of the object to be cleaned such as fibers. In addition, it is possible to precisely clean the surface of the object to be cleaned such as metal parts. Further, by immersing the item to be washed in a gas-dissolved liquid under pressure, discharging the liquid, and then depressurizing the same, innumerable bubbles are similarly generated inside and on the surface of the item to be washed, which are contained in the item to be washed, or Dehydrates the adhering liquid by misting and scattering. Due to the above-mentioned effects, the present invention provides excellent effects such as being able to perform micro-level precise cleaning as compared with conventional different liquid cleaning, and being also usable as a new dehydrating means.

[Brief description of drawings]

FIG. 1 is a system diagram of a cleaning / dehydrating device according to an embodiment of the present invention.

FIG. 2 is a schematic view of a state in which air bubbles are generated in the article to be washed such as fibers.

FIG. 3 is a schematic view of a state in which air bubbles are generated in an article to be washed such as a metal part.

FIG. 4 is a schematic diagram showing a dissolution curve of carbon dioxide in water.

FIG. 5 is a model diagram for washing an article to be washed such as a fiber according to a conventional technique.

FIG. 6 is a model diagram for washing an object to be washed such as a metal part according to a conventional technique.

FIG. 7 is a system diagram showing a conventional bubble-based cleaning method.

FIG. 8 is a system diagram showing a conventional bubble-based cleaning method.

[Explanation of symbols]

 1,3 Washed object 2,2 'Gas-dissolved liquid 7 Cleaning tank 16 Pressurized gas dissolution tank 19 Decompression tank

Claims (2)

[Claims] 1. A container containing a liquid in which a gas is dissolved is immersed in the liquid to be washed under pressure, and then the container is depressurized to generate fine bubbles in the liquid. A washing method comprising washing a wash item. 2. A container containing a liquid in which gas is dissolved is immersed in the liquid to be washed under pressure, and then the liquid is discharged from the container to drain the liquid to be washed. Thereafter, the article to be washed is placed under a reduced pressure to generate fine bubbles inside or on the surface of the article to be washed, thereby dehydrating the article to be washed.