JPH0741199B2 - Pressure washing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cleaning for removing an object (hereinafter referred to as an adhered matter) attached to a tangible object (hereinafter referred to as an object to be cleaned), and particularly, although not intended to be limited to this, a tool,
The present invention relates to cleaning for removing oil and the like attached to metal products such as machine parts during processing and manufacturing processes.

[0002]

2. Description of the Related Art For this type of conventional cleaning, a chlorine-based organic solvent such as CFC or an aqueous cleaning agent such as an aqueous solution of caustic soda is used, and the solvent or the cleaning agent is required under normal pressure or reduced pressure. Is heated accordingly.

[0003]

Solvents have a problem of air pollution. In order to prevent the release of the solvent into the atmosphere, move the cleaned object from the cleaning room with the cleaning tank to the drying room,
The cleaned object is put out from the drying chamber, the uncleaned object is put in the drying chamber, the drying chamber is closed, and the uncleaned object in the chamber is transferred to a room having a cleaning tank. It is necessary to carry out an object transfer of putting the cleaned object in a cleaning tank and transferring the cleaned object to the drying chamber when this cleaning is completed, and a step of collecting the vaporized solvent in the drying chamber. It is impossible to completely recover the solvent because the amount of auxiliary equipment increases and the vaporized solvent leaks to the atmosphere when the object to be cleaned is put in or taken out of the drying chamber.

In the case of cleaning using a water-based cleaning agent, there is virtually no problem of air pollution, and it is relatively easy to recover and reuse the cleaning agent.
%, A very high concentration cleaning agent is used, such as an aqueous solution of caustic soda as a cleaning solution, and it requires a large amount of water and time to remove the cleaning agent from the object to be washed with water after cleaning. A draining process and a drying process are required after washing with water. That is, the equipment and processing time are increased in the subsequent process rather than the cleaning process. Although improvements have been made to equipment and cleaning agents for cleaning with water-based cleaning agents, the cleaning effect of chlorine-based solvents and the advantage of the process that can be taken out in a dry state after cleaning remain as issues for cleaning with water-based cleaning agents. ing.

An object of the present invention is to take advantage of water in conventional water-based cleaning, obtain a high cleaning effect, and make post-cleaning treatment simple or substantially unnecessary.

[0006]

According to the pressure type cleaning method of the present invention, the pressure vessel (1) is heated by heating the object to be cleaned (30) and water or a cleaning liquid containing water or an aqueous cleaning agent. and, a pressurized container pressure below 0.5 Kg / cm ² or more 3 Kg / cm ^2, is not substantially vaporized cleaning liquid to the washing liquid temperature in a pressurized vessel pressure
Keeping the temperature at 80 ℃ to 130 ℃, wash the deposits of the cleaning object immersed in it with the high temperature and high pressure cleaning liquid , and pressurize the container.
(1) Drain the cleaning solution inside the container and cool it outside the container.
After separating the deposits from the cleaning liquid due to the difference in specific gravity, pressurization container
Re-supplied to the (1).

The pressure type washing apparatus of the present invention comprises a pressure vessel (1) for containing an article to be washed (30) having a water injection port (6) and a drain port (7a, 7c); An adherent separation tank (12) for separating adherents from water or a cleaning liquid containing a water-based cleaning agent containing the adherents adhered to, by the difference in specific gravity;
From the drainage port (7a, 7c) of the pressure vessel (1) to the deposit separation tank
Cooling device (25a, 25c) for cooling the cleaning liquid flowing to (12); supplying the cleaning liquid from which the adhered substances are separated in the adherent separated tank (12) to the water inlet (6) of the pressure vessel (1) Pump (21); heating means (4) for heating the cleaning liquid in the pressure vessel (1); temperature sensor (26) for detecting the temperature of the cleaning liquid in the pressure vessel (1); and pressure vessel (1) Pressure sensor (1
0);

The symbols in parentheses are used for corresponding elements in the embodiments shown in the drawings and described later.

[0009]

[Function] In the pressure type cleaning method of the present invention, 0.5 Kg / cm ² or more 3
The pressure of Kg / cm ² or less, at a temperature of 80 ° C to 130 ° C at which the cleaning liquid does not substantially vaporize at the pressure, cleaning with a high-temperature high-pressure cleaning liquid containing water or a water-based cleaning agent in water, the surface of the object to be cleaned The cleaning power of adhered substances is high. For example, the oil or the like adhering to the metal product has a reduced viscosity and is fluidized and moves upward in the cleaning liquid away from the object to be cleaned.

As an example, Table 1 shows the characteristics of the quenching oil of a metal part (machine part), that is, a carburizing quenching part which has been subjected to a high temperature carburizing treatment and put into a quenching oil.

[0011]

[Table 1]

For example, in the case of grade B quenching oil in Table 1, when it is heated from 40 ° C. to 100 ° C., the kinematic viscosity drops from 438.1 cSt to 32.27 cSt, less than 1/10, and the vapor of water. It can be seen that the quenching oil can be easily removed at the temperature of conversion (100 ° C.) or higher.

Table 2 shows the vapor pressure characteristics of water. The shaded area in Table 2 is the area to which the pressure-type cleaning method of the present invention is applied.

[0014]

[Table 2]

The lower limit values of pressure and temperature (pressure 0.5 Kg, temperature 80 ° C.) in the method of the present invention are the lower limit conditions for promoting fluidization of deposits mainly composed of oil and substantially preventing vaporization of the cleaning liquid. And the upper limit value (pressure 3.0 kg, temperature 130 ° C)
Is the upper limit condition obtained from the pressure resistance of the pressure vessel (1), the load (required discharge pressure) of the pump (21) that supplies the cleaning liquid to the pressure vessel (1), and the safety of the cleaning operation. Table 1 shows that
It shows only a kinematic viscosity of 100 ° C, but even at the lower limit temperature of 80 ° C, the viscosity drops significantly at 40 ° C, and quenching oil can be easily removed. When the temperature is higher than the lower limit temperature, the viscosity is further lowered, the quenching oil removing effect is further enhanced, and at the upper limit temperature 130 ° C., the removing effect is extremely high.

As will be described later, the above region of the method of the present invention (pressure 0.5 kg, temperature 80 ° C. to pressure 3.0 kg, temperature 130 ° C.)
The high-temperature and high-pressure cleaning described above brings about a sufficient cleaning effect with water or a cleaning liquid containing a small amount of an aqueous cleaning agent mixed with water. When the cleaning liquid is water only or when the residual amount is small enough to cause no problem even if an aqueous cleaning agent is mixed, after cleaning, the object to be cleaned is heated by the heat of the object to be cleaned itself. Since it is dried, there is no need for washing with water or a special drying step for removing the residual detergent.

Even when a cleaning liquid prepared by mixing an aqueous cleaning agent with water is used, the effect of cleaning by high temperature and high pressure is high, so that the concentration of the aqueous cleaning agent can be suppressed to an extremely low level, and the cleaning can be carried out for removing the cleaning agent after cleaning. Is simple and requires a small amount of water in a short time, and the temperature drop of the object to be cleaned is small, so a drying step is unnecessary or simple. In addition, cleaning inside the pressure vessel (1)
The liquid is discharged to the outside of the container and cooled outside the container, depending on the specific gravity difference.
After separating the deposits from the cleaning liquid, re-supply to the pressure vessel (1)
Consumes less cleaning liquid and virtually no cleaning waste
Since it is a kimono and it is a small amount, it is
It's easy.

According to the pressure type cleaning apparatus of the present invention, the pump
(21) is supplied to the water inlet (6) of the pressure vessel (1) the cleaning liquid in which the adhered matter is separated in the adherent matter separation tank (12), the heating means (4),
The cleaning liquid in the pressure vessel (1) is heated. Deposits on the surface of the object to be cleaned, particularly deposits that are easily dissolved or fluidized in water at a high temperature, are dissolved or mixed with the cleaning liquid heated and pressurized in the pressure vessel (1). The cleaning liquid containing deposits flows from the discharge port (7a, 7c) of the pressure vessel (1) to the deposit separation tank (12) with the above supply of the pump (21), but the cooling device (25a, 25c). Cools this wash solution. Due to this cooling, the deposits will be removed from the deposit separation tank.
In (12), it becomes easy to separate from water, and vaporization of the cleaning liquid in the adhered substance separation tank (12) can be prevented.

Based on the temperature detected by the temperature sensor (26) and the pressure detected by the pressure sensor (10), the heating amount by the heating means (4),
By controlling the amount of the cleaning liquid supplied by the pump (21) and the like, the cleaning liquid in the pressure vessel (1) can be maintained at high temperature and high pressure, which has a high effect of cleaning adhered substances. In addition, the cooling device (25a, 2
By cleaning the cleaning liquid sent from the pressure vessel (1) to the deposit separation tank (12) by 5c), the deposit of the cleaning liquid is separated into the deposit separation tank.
In (12), it becomes easy to separate from the cleaning liquid, and vaporization of the cleaning liquid in the deposit separating tank (12) can be prevented.
When the cleaning is finished, the heating by the heating means (4) is stopped, the pump (21) and the cooling devices (25a, 25c) continue to be driven, and the pressure inside the pressure vessel (1) becomes substantially atmospheric pressure. Pressurized container when the cleaning liquid drops below a value at which it does not evaporate
By opening the upper lid (2) of (1), taking out the object to be cleaned and putting the uncleaned object to be cleaned, there is substantially no escape of the cleaning liquid to the atmosphere.

Other objects and features of the present invention will become apparent from the following description of embodiments with reference to the drawings.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of the main part of a cleaning apparatus for carrying out the present invention in one mode. This cleaning device cleans and removes the quenching oil of the metal parts (machine parts), that is, the carburizing and quenching parts that have been carburized at high temperature and put into the quenching oil.
That is, the cleaning apparatus shown in FIG. 1 mainly targets the quenching oil having the characteristics shown in Table 1 and attached to the component.
Please refer to FIG. The pressure can 1 is roughly composed of a main body 3 and an upper lid 2, a cage 30 containing carburized and quenched mechanical parts is placed on a cage abutment in the main body 3, and the upper lid 2 has a clutch lock 8 It is airtightly connected to the body 3. By a mechanism (not shown), the lock 8 is released, the upper lid 2 is opened, the cage 30 is taken out from the main body 3, and the cage 30 is loaded.
And the lock 8 is automatically locked.

At the upper position of the main body 3, two circulation drainage ports 7a, 7b (not shown) are opened facing each other, and a pipe airtightly connected to these drainage ports is used to
Further, the electric valve 23a, the bypass valve 24a and the electric valve 23
a, the cleaning liquid in the upper part of the main body 3 flows through the bypass valve 24a to the multi-tube coolers 25a and 25b, and is discharged to the oil / water separation tank 12 through these coolers 25a and 25b.
The cleaning liquid for the main body 3 passes through the drainage port 7c at the lower portion of the main body 3, and also through the motor-operated valve 23c, the bypass valve 24c and the multi-tube cooler 25c to separate the oil-water separation tank 1
It is discharged to 2. The oil / water separation tank 12 has partition plates 19a and 19c that are lowered from the top to the bottom and partition plates 19b and 19d that are standing from the bottom to the top, and the cleaning liquid discharged from the pressure can 1 is first in the rightmost separation chamber. Enter (Room 1). In this separation chamber, the object contained in the cleaning liquid, which is lighter than water, that is, the oil that was the deposit of the carburized and quenched machine parts in the cage 30 rises and the water content drops, so that the object of low specific gravity ( The oil is the upper layer and the water is the lower layer. The cleaning liquid containing less oil in the lower layer flows into the second chamber through the passage below the partition plate 19a. Also in this second chamber, the oil content rises and the water content falls, so that the object (oil) having a low specific gravity becomes the upper layer, and the water becomes the lower layer. The oily cleaning liquid in the upper layer of the second chamber is separated by the partition plate 1
It flows through the passage above 9b into the third chamber. Even in this third chamber, the oil content rises and the water content falls, and objects (oil) with low specific gravity
Is the upper layer, and water is the lower layer. The cleaning liquid containing less oil in the lower layer of the third chamber flows into the fourth chamber through the passage below the partition plate 19c. Also in this fourth chamber, the oil content rises and the water content falls, so that the object (oil) having a low specific gravity becomes the upper layer, and the water content becomes the lower layer. The oil-rich cleaning liquid in the upper layer of the fourth chamber flows into the fifth chamber through the passage above the partition plate 19d. Also in this fifth chamber, the oil content rises and the water content falls, so that an object (oil) having a low specific gravity becomes the upper layer, and the water becomes the lower layer. The cleaning liquid containing a small amount of oil in the lower layer of the fifth chamber is sucked by the electric pump 21 through the filter 20, and is pressurized and injected into the main body 3 through the check valve 22 and the water injection port 6 on the lower bottom of the main body 3. It
In the oil-water separation tank 12 described above, the cleaning liquid discharged from the pressurizing can 1 is separated into water and lighter oil while flowing from the first chamber to the fifth chamber, and most of the oil content is from the first chamber to the first chamber. It stays in 5 chambers, and the upstream chamber has more oil in the upper layer. Then, the cleaning liquid containing the least amount of oil is sucked by the pump 21 and supplied under pressure to the pressure can 1.

A U-shaped steam pipe 4 is provided in the main body 3 of the pressurizing can 1 so as to circulate around the cage 30, and these steam pipes 4 are provided with a flow control valve (not shown). Then, high temperature steam is supplied as a heating medium. This enables pressure can 1
The cleaning liquid inside is heated. An electric stirrer 5 is provided at the bottom of the pressure can 1, and this stirring screw applies a water stream to the bottom surface of the cage 30 containing the carburized and quenched mechanical parts. As a result, the cleaning liquid flows in a rough manner and draws a loop indicated by a chain line in FIG.

The pressure can 1 has a thermocouple 26 for detecting the temperature of the cleaning liquid therein and a pressure gauge 1 for detecting the internal pressure.
0, and safety valve for releasing abnormally high pressure (Brief valve) 9
And a drain valve 11 for maintenance drainage is provided. Next, a usage mode of the cleaning apparatus shown in FIG. 1 will be described.

1. Continuous circulation mode: When the can 30 containing the carburized and quenched mechanical parts is stored in the pressure can 1, the pressure can 1 is filled with sufficient cleaning liquid so that the cleaning liquid level becomes higher than the drain port 7a. In addition, the oil-water separation tank 12 has an overflow port 1
The washing liquid up to 7 is added. Drain valve 11, bypass valves 24a to 24c, drain valves 16, 18, drain oil valve 13
And all the water injection valves 16 are closed. Motor operated valves 23a-23
Also close c.

A. When one cage 30 containing mechanical parts is housed in the main body 3, the upper lid 2 is airtightly closed, and the upper lid 2 is locked by the clutch lock 8, the supply of high temperature steam to the steam pipe 4 is started, and the stirrer is started. 5 is monitored and the detection temperature of the thermocouple 26 and the detection pressure of the pressure gauge 10 are monitored. When the detection temperature exceeds a set value or the detection pressure of the pressure gauge 10 exceeds the set value, the multi-tube curler 25a and Alternatively, the supply of the cooling water to 25b is started, the electric valve 23a and / or the electric valve 23b is opened, and the pump 21 is driven. Then, by the feedback control, the flow rate of the high temperature steam supplied to the steam pipe 4 is adjusted so that the detected temperature of the thermocouple 26 is within the set range, and the pump 21 is adjusted so that the detected pressure of the pressure gauge 10 is within the set range. Adjust the drive speed of. The opening degree of the motor-operated valves 23a and / or 23b and the amount of cooling water supplied to the multi-tube coolers 25a and / or 25b are set and adjusted so that the cleaning liquid discharged from the coolers into the oil / water separation tank 12 is not substantially vaporized. .

B. When the set temperature elapses while the detected temperature of the thermocouple 26 is within the set range and the detected pressure of the pressure gauge 10 is within the set range, the driving speed of the pump 21 is reduced to supply the high temperature steam to the steam pipe 4. Stop, supply cooling water to all the multi-tube coolers 25a to 25c, and operate the motor-operated valve 23a.
˜23c is opened to an opening such that the cleaning liquid discharged through the cooler into the oil / water separation tank 12 is not substantially vaporized. Then, the temperature detected by the thermocouple 26 and the pressure detected by the pressure gauge 10 are monitored, and they are waited until the cleaning liquid in the pressure can 1 is not substantially vaporized even when the upper lid 2 is opened.

C. Temperature detected by thermocouple 26 and pressure gauge 1
When the detected pressure of 0 is such that the cleaning liquid in the pressurizing can 1 is not substantially vaporized even when the upper lid 2 is opened, the pump 21 and the agitator 5 are stopped, the motor operated valves 23a to 23c are closed, and the multi-tube claw is closed. -Stop the supply of cooling water to the la 25a to 25c. The cooling water supply to the multi-tube coolers 25a to 25c does not necessarily have to be stopped. Then, the clutch lock 8 is released, the upper lid 2 is opened, and the cage 30 is taken out.

Instead, one cage 30 containing unwashed machine parts is housed in the main body 3. Hereinafter, the above A. ~ C. Repeat. When the amount of recovered oil in the oil / water separation tank 12 reaches a certain level, the oil discharge valve 14 is opened to recover the upper layer liquid of the first chamber (rightmost chamber) of the oil / water separation tank 12. Oil-water separation tank 12
When the liquid level decreases, the water injection valve 16 is opened to replenish the water, and when the water-based cleaning agent is used, the water-based cleaning agent corresponding to the amount of replenished water is put into the tank 12. When lowering the oil concentration or the water-based detergent concentration in the cleaning liquid, the water injection valve 16 is opened to replenish the oil / water separation tank 12 with water, and the drain valve 14 and the drain valve 18 are opened to recover the excess cleaning liquid in the tank 12. To do. The sludge (mud matter) in the tank 12 is collected by opening the drain valve 16.

In the operation of the continuous circulation mode described above, the cleaning liquid is an oil / water separation tank 12 → pressurized can 1 → curler 2.
5a, etc. → Circulates with the oil / water separation tank 12, the cleaning liquid is heated in the pressure can 1 and the viscosity of the oil adhering to the object to be cleaned is greatly reduced (see Table 1), fluidizes, and mixes with the cleaning liquid to pressurize the can. Get out of 1. That is, efficient cleaning of adhered substances is realized. Since the cleaning liquid discharged from the pressurizing can 1 is cooled by the cooler 25a or the like, the cleaning liquid is substantially not vaporized in the oil / water separation tank 12, and the viscosity of the oil mixed with the cleaning liquid is increased, so that the oil / water separation is efficient. Will be realized. Virtually no escape to the atmosphere due to oil vaporization. After cleaning, the temperature of the object to be cleaned discharged from the pressure can 1 is relatively high, and if left as it is, the cleaning liquid (water) vaporizes and escapes from the object to be cleaned. If a small amount remains even when used, no special drying step is required.

2. Injection / discharge switching mode: There is substantially no cleaning liquid in the pressurizing can 1, but the oil-water separation tank 12 contains a cleaning liquid that reaches the overflow port 17. Drain valve 1
1, the bypass valves 24a to 24c, the drain valves 16 and 18, the oil discharge valve 13 and the water injection valve 16 are all closed. Motorized valve 23
Also, a to 23c are closed.

A. When one cage 30 containing mechanical parts is housed in the main body 3 and the upper lid 2 is airtightly closed, and the upper lid 2 is locked by the clutch lock 8, the pump 21 is driven and the level of the drainage port 7a (case). The parts inside the container 30 are immersed in the cleaning liquid) or higher, and the cleaning liquid is supplied into the pressure can 1. Then, the pump 21 is stopped. next,
The supply of high temperature steam to the steam pipe 4 is started, the stirrer 5 is driven, the temperature detected by the thermocouple 26 and the pressure detected by the pressure gauge 10 are monitored, and the temperature detected by the thermocouple 26 is set by feedback control. The flow rate of the high temperature steam supplied to the steam pipe 4 is adjusted so that the pressure becomes a range and the detection pressure of the pressure gauge 10 becomes a set range.

B. When the set temperature elapses while the detected temperature of the thermocouple 26 is within the set range and the detected pressure of the pressure gauge 10 is within the set range, the stirrer 5 is stopped and the steam pipe 4
To stop the supply of high temperature steam to the coolers 25a and 25a.
b to supply cooling water to the motor-operated valves 23a and 23b.
The cleaning liquid discharged from the tank to the oil / water separation tank 12 is opened to an opening that does not substantially vaporize. Then, the pressure of the pressure gauge 10 is monitored, and when the pressure drops to a set pressure near atmospheric pressure, the pump 21 is driven at a low speed. Then, the temperature detected by the thermocouple 26 and the pressure detected by the pressure gauge 10 are monitored, the pump 21 is accelerated within a range in which the pressure does not exceed the set pressure, and the temperature detected by the thermocouple 26 becomes
When the temperature reaches a temperature at which the cleaning liquid does not substantially vaporize under atmospheric pressure, the pump 21 is stopped, cooling water is supplied to the multi-tube cooler 25c, and the electric valve 23c is fully opened.

C. When the level of the cleaning liquid in the pressure can 1 drops below the lower bottom of the cage 30, the multi-tube cooler 25a ...
Supply of cooling water to 25c is stopped, and motor operated valves 23a-23
Close c. Then, the clutch lock 8 is released, and the upper lid 2
Open and take out the cage 30.

Instead, one cage 30 containing uncleaned mechanical parts is housed in the main body 3. The above a. ~ C. Repeat. When the amount of recovered oil in the oil / water separation tank 12 reaches a certain level, the c. At the stage of, the oil discharge valve 14 is opened to collect the upper layer liquid of the first chamber (rightmost chamber) of the oil / water separation tank 12. Water injection valve 16 when the liquid level in the oil / water separation tank 12 decreases
Is opened to replenish water, and when a water-based cleaning agent is used, the water-based cleaning agent corresponding to the amount of replenished water is put into the tank 12. When lowering the oil concentration or the water-based detergent concentration in the cleaning liquid, the water injection valve 16 is opened to replenish the oil / water separation tank 12 with water, and the drain valve 14 and the drain valve 18 are opened to recover the excess cleaning liquid in the tank 12. To do. The sludge (mud matter) in the tank 12 is collected by opening the drain valve 16.

In the operation of the injection / discharge switching mode described above, when the object to be cleaned is put into the pressure can 1, the cleaning liquid in the oil / water separation tank 12 is supplied to the pressure can 1. Then, while the circulation of the cleaning liquid is stopped, pressurization and heating of the cleaning liquid in the pressure can 1 under a predetermined condition are maintained. When the heating under pressure for a predetermined time is completed, the heating is stopped, and the cleaning liquid (low temperature) in the oil / water separation tank 12 is pressurized until the temperature detected by the thermocouple 26 reaches a temperature at which atmospheric pressure does not substantially vaporize the cleaning liquid. 1 and the cleaning liquid (high temperature) for the pressure can 1 is discharged accordingly. Since this discharge is performed at the upper drain ports 7a and 7b,
The liquid used for cleaning is discharged from the upper layer (having a high temperature and a large amount of oil) to the oil / water separation tank 12 via the cooler. When the temperature detected by the thermocouple 26 is atmospheric pressure and the temperature at which the cleaning liquid does not substantially vaporize, the supply of the cleaning liquid to the pressurizing can 1 is stopped, the electric valve 23c is opened, and the cleaning liquid in the pressurizing can 1 is at the lower position. Is drained to the oil / water separation tank 12 through the drainage port 7c. Even in this injection / discharge switching mode, the pressure can 1
When the cleaning liquid is heated inside, the viscosity of the oil adhering to the object to be cleaned greatly decreases (see Table 1) and fluidizes and mixes with the cleaning liquid,
Finally, the pressure can 1 exits. That is, efficient cleaning of adhered substances is realized. The cleaning liquid discharged from the pressure can 1 is cooler 25.
Since it is cooled by a or the like, the cleaning liquid is substantially not vaporized in the oil / water separation tank 12, the viscosity of the oil mixed in the cleaning liquid is increased, and the oil / water separation is efficiently realized. Virtually no escape to the atmosphere due to oil vaporization. After cleaning, the temperature of the object to be cleaned discharged from the pressure can 1 is relatively high, and if left as it is, the cleaning liquid (water) vaporizes and escapes from the object to be cleaned. If a small amount remains even when used, no special drying step is required.

The filling of the cleaning liquid in the pressure can 1, the heating under pressure, and the discharge of the cleaning liquid from the pressure can 1 described above may be repeated several times for the same object to be cleaned. .
Further, the above-mentioned continuous circulation mode and injection / discharge switching mode may be combined for the same object to be cleaned.

Next, the cleaning effect of the above cleaning device will be described. As the cleaning liquid, only water and 0.1 to 0.2% aqueous solution of caustic soda are used, and the cleaning temperature (the temperature detected by the thermocouple 26) is set to
90 to 150 ° C., the above a. As a result of performing pressure heating in a steady state for 20 minutes, there was a cleaning effect shown by a black circle in FIG. The pressure detected by the pressure gauge 10 is 0.5 to 3.0 Kg / cm ² . In addition, the results obtained by performing the washing under the same conditions except that the washing solution was a 0.5 to 0.8% aqueous solution of caustic soda are shown by white circles in FIG. Based on these results, the cleaning solution was water only and 0.
In the case of 1-0.2% aqueous solution of caustic soda, approximately 110-1
It can be seen that there is an excellent cleaning effect at 50 ° C. Wash solution to 0.
It can be seen that when the aqueous solution of caustic soda of 5 to 0.8% is used, an excellent cleaning effect is obtained at 80 ° C or higher. In addition, the above A.
Even if the steady-state pressure heating at 20 minutes is performed,
Or more effect can be obtained.

[0039]

FIG. 3 shows the cleaning effect by the conventional cleaning method (white block) and the cleaning effect by the above-described cleaning apparatus of the present invention (shaded block). In the conventional alkaline cleaning, a caustic soda aqueous solution having a concentration of 3 to 5% is used, but according to the present invention, an excellent cleaning effect can be obtained at a low concentration. In the present invention, since the cleaning liquid is water or a very small amount of an aqueous cleaning agent added to water, it is easy to control the concentration of the cleaning agent, and management complexity and cost are also improved. Pressurization
The cleaning liquid in the container (1) is discharged outside the container and cooled outside the container.
After separating the adhering substances from the cleaning liquid by the difference in specific gravity, pressurize
As it is re-supplied to the container (1), the consumption of cleaning liquid is low and cleaning is possible.
Since the waste is practically a deposit and a small amount, it can be washed and discarded.
Disposal of waste is easy.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a device of the present invention.

FIG. 2 is a graph showing cleaning results using the cleaning device shown in FIG.

FIG. 3 is a graph showing a distribution of residual oil content by a conventional cleaning method and a distribution of residual oil content by cleaning using the cleaning apparatus shown in FIG.

[Explanation of symbols]

1: Pressurized can (pressurized container) 2: Upper lid 3: Main body 4: Steam pipe (heating means) 5: Stirrer (stirring means) 6: Water injection port (water injection port) 7a, 7c: Drain port 8: Clutch lock 9: Safety valve 10: Pressure gauge (pressure sensor) 11: Drain valve 12: Oil-water separation tank (sediment separation tank) 13: Oil drain port 14: Oil drain valve 15: Drain port 16: Drain valve 17: Overflow port 18 : Drain valve 19a to 19d: Partition plate 20: Filter 21: Pump 22: Check valve 23a to 23c: Electric valve 24a to 24b: Bypass valve 25a to 25c: Multi-tube cooler (cooling device) 26: Thermocouple ( Temperature sensor) 30: A cage containing an object to be cleaned

Claims (2)

[Claims] 1. A washload and the water or water putting a cleaning liquid formulated with an aqueous cleaning agent by heating the washing liquid in a pressurized vessel, the pressure vessel internal pressure 0.5 Kg / cm ² or more 3 Kg / cm ² or less In addition, the cleaning liquid temperature does not substantially evaporate when the pressure in the pressure vessel is increased.
Maintained at a temperature of 80 ° C. to 130 DEG ° C., washed deposits the cleaning object immersed in it by high temperature and high pressure cleaning liquid, pressurized container
Drain the cleaning liquid from outside the container and cool it outside the container to determine the difference in specific gravity.
After separating the adhered substances from the cleaning liquid by
Pressure cleaning method to supply . 2. A pressurizing container having a water injection port and a drain port for accommodating an object to be cleaned; water containing an adhering material adhering to the object to be cleaned; An adherent separation tank for separating adherents by a difference in specific gravity; a cooling device for cooling the cleaning liquid flowing from the drainage port of the pressure vessel to the adherent separation tank; a cleaning liquid in which the adherents are separated in the adherent separation tank, A pump for supplying water to the water inlet of the pressurized container; a heating unit for heating the cleaning liquid in the pressurized container; a temperature sensor for detecting the temperature of the cleaning liquid in the pressurized container; and a pressure in the pressurized container. A pressure type cleaning device including a pressure sensor.