JPH071068U - Cleaner using organic solvent - Google Patents

Abstract

(57) [Abstract] [Purpose] It is effective to deal with organic solvents in the low boiling point range by using the conventional washing machine without changing the washing tank and other modifications, and also the consumption rate of the organic solvent. To provide a washer having reduced [Structure] A suction hole 11 and a blowout hole 17 are provided in the upper part of a cleaning tank 1 for storing an organic solvent 6, and a space between them is connected by a duct 12 provided with a condenser 14, a heat exchanger 15 and an oil / water separator 16. A cleaning device using an organic solvent in which a suction blower is installed in the duct is constructed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cleaning device that uses an organic solvent, and more particularly to a cleaning device that reduces the consumption rate of the organic solvent and can use an organic solvent in a low boiling point range.

[0002]

[Prior art]

 In a conventional washing machine using an organic solvent composed of 1.1.2-trichloro-1.2.2-trifluoroethane (CFC-113) having a boiling point of 47.6 ° C., the solvent overflowing from the upper surface of the washing tank is used. Prevention of steam was also emphasized in terms of the environment and measures to save CFCs.

Thereafter, those having a high boiling point range, such as CFCs H-225Ca (boiling point 51.1 ° C.) and H-225Cb (boiling point 56.1 ° C.), which have appeared as alternative CFCs, are expensive and therefore difficult to use. Organic solvents in the low boiling point range consisting of 1.1 dichloro-1-fluoroethane (Freon HCF C-141b) at ℃ are promising as cleaning agents, but the consumption of the solvent increases two to three times that of the conventional method. That is a drawback.

Therefore, although a cleaning facility suitable for these should be newly installed, the cleaning device that has been used for the conventional organic solvent is modified so that these low boiling point organic solvents can also be used. As a result, a cleaner for organic solvents, which has a reduced consumption rate due to environmental issues and CFC saving, has become an issue.

One of the countermeasures is to increase the freeboard ratio. Here, the freeboard ratio is the ratio of the depth to the steam line to the opening size of the cleaning tank. A large freeboard ratio means that the inner part of the tank should be deep, but it is impossible to make it deeper than the current cleaning tank from the viewpoint of workability.

The second countermeasure is to lower the cooling water temperature of the cooling pipe. However, conventional organic solvents in the boiling range could have taken this measure, but in order to condense the low boiling organic solvent with the same concentration as the conventional organic solvent, it is necessary to keep the temperature below 0 ° C. It is impossible because it freezes.

As a measure to prevent the diffusion of the organic solvent, there is a method of forming an air curtain on the upper end surface of the cleaning tank. However, in the case of steam cleaning, the air curtain is disturbed by the inflow and outflow of articles, and only the volume of the articles produces vapor. Since it overflows, it is not an effective measure.

There is also a method in which a suction hole directly connected to the condenser is arranged at the position of the steam line above the cleaning tank, and suction is performed by a natural force generated by condensation. However, the steam line is wavy and unstable, so its operation is not sufficient and it is not an effective countermeasure.

[0009]

[Problems to be solved by the device]

 In view of the above circumstances, the present invention is effective in dealing with an organic solvent in a low boiling point range by using a conventional cleaning device, without changing the cleaning tank, and by modifying it other than that. An object of the present invention is to provide a cleaning device with a reduced wear rate.

[0010]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention has a duct in which a suction hole and an outlet hole are provided in the upper part of a cleaning tank for storing an organic solvent, and a condenser, a heat exchanger and an oil / water separator are provided between them. And a suction blower is installed in the duct to form a cleaner using an organic solvent.

[0011]

[Work]

 In order to reduce the consumption rate of the organic solvent that easily evaporates in the low boiling point region, when vapor cleaning is performed in an open cleaning tank, the solvent vapor overflows by the volume of the article to be submerged. Need to stay.

Therefore, if the solvent vapor in the upper part of the cleaning tank is positively sucked, cooled by the condenser and liquefied and recycled to the cleaning tank via the oil / water separator, it corresponds to the volume of the article to be submerged. The amount of solvent vapor flowing out is reduced and the concentration becomes low, and the wear rate can be stably reduced.

At this time, since it is effective that the solvent vapor to be sucked is as concentrated as possible, it is preferable to dispose the suction holes before and after the vapor line or near the vapor line below the vapor line. Here, the vapor line is a boundary line that forms a rich vapor layer. For example, when arranging 12 to 3 cooling pipes along the vertical direction on the standing wall in the upper part of the cleaning tank, the 2nd to 3rd pipes from the bottom. Water droplets adhere to the surface of the cooling pipe, and their positions correspond to the steam lines.

However, the liquefied solvent after the treatment is put into the washing tank again from the blowout hole, and in order to maintain the stability of the steam washing, although suction is positive, the volume is as small as possible. It is preferably one. Therefore, it is desirable that the suction blower has a small capacity of, for example, about 0.2 m ³ / min, at least 1 m ³ / min or less.

On the other hand, as shown in FIG. 2, it is a vapor pressure diagram showing that the temperature of the cooling water cannot theoretically be lowered by the solvent in the low boiling point range described above. First, when the pressure is 1 atm, the conventional CFC-113 has a boiling point of 47.6 ° C at the point A, and the low boiling point solvent HCFC-141b has a boiling point of 32 ° C at the point B. . At C point of 10 ° C, CFC-11 3 shows that it condenses if it is about 0.25 Kg / cm or less. In order to obtain the same conditions, at point D of HCFC-141b, it is around -4 ° C. This means that cooling water is frozen and impossible.

[0016]

【Example】

 Hereinafter, one embodiment of the cleaning device used for the organic solvent of the present invention will be described in detail with reference to FIG.

First, a cleaning device used for a conventional organic solvent will be described. 1 is a cleaning tank, 2 is a heater for the cleaning tank, 3 and 3 are standing walls on the upper side of the cleaning tank, and inside the standing walls, along the vertical direction up to the upper ends 4 and 4, in the case of this embodiment, Twelve cooling pipes 5a ₁ , ..., 5a ₁₂ , 5b ₁ , ..., 5b ₁₂ are arranged.

In this case, the cleaning tank 1 contains Freon HCFC-141b made of the organic solvent 6 in the low boiling point range. However, in the case of the present invention, the cleaning agent is not necessarily limited to CFCs or low boiling point solvents.

Reference numeral 7 denotes the liquid surface of the cleaning solvent, on which a concentrated vapor layer 8 of the heated solvent stands. 9 is a vapor line on the upper surface of this solvent vapor. The steam line 9, in the present embodiment has hit a position near the cooling pipe 5a _3, 5b ₃ of three from the bottom, the cooling tube below the cooling tube 5a _3, 5b ₃ is adhesion of water droplets to the surface It is in the rich vapor layer 8.

Reference numeral 10 denotes an article made of an object to be cleaned, which is submerged to the position of the steam line for steam cleaning.

Then, a is an opening size between the standing walls 3 and 3, b is a depth from the upper ends 4 and 4 of the standing wall to the steam line 9, and b / a is a freeboard ratio. The larger the cleaning tank is, the smaller the loss of solvent is, but if the cleaning tank is deeper than this, there is a problem in workability. The washer must be improved.

Therefore, in the cleaning device using the organic solvent of the present invention, the suction hole 11 is arranged in the concentrated solvent vapor layer 8 near the vapor line 9 above the cleaning tank 1 for storing the organic solvent 6. .

In the case of the present embodiment, a suction blower 13 having a small capacity of 0.2 m ³ / min is installed in the duct 12 connecting the suction holes 11 so as to positively suck the solvent vapor. ing. However, even though the suction blower is positively sucked, it is preferable that the suction blower has a small capacity of at least 1 m ³ / min or less so as not to disturb the vapor line.

Then, the condenser 14 is connected directly to the suction blower 13. A heat exchanger 15 is attached to the condenser 14, and the solvent vapor is liquefied by the cooling water.

Next to the condenser 14, an oil / water separator 16 is attached, and the water in the liquefied solvent is removed by the oil / water separator.

Then, the suction solvent is returned to the cleaning tank 1 again for recycling through the outlet side pipe 17 of the oil-water separator 16. On the other hand, the non-condensable vapor in the condenser 14 is returned to the inside of the cleaning tank by the blowout hole 19 connected to the arrangement pipe 18. The condenser and the like of this embodiment can be made stronger by arranging two stages in parallel.

[0027]

[Effect of device]

 By systematizing or modifying the washing machine used for the organic solvent of the present invention in this way, 71.9% of the solvent diffusion components scattered by the conventional washing machine can be recovered. It was possible to improve the recovery rate of the solvent.

With the cleaning device of the present invention, conventional equipment can be used, and it is possible to adapt to various solvents including a low boiling point region at a low cost for modification.

In the cleaning device of the present invention, if the suction hole is provided near the vapor line, the concentrated solvent vapor can be efficiently treated, and if the suction blower has a small capacity, the vapor line will be disturbed. None, useful and practical.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a cleaning device using an organic solvent according to an embodiment of the present invention.

FIG. 2 is a vapor pressure diagram of a low boiling point solvent.

[Explanation of symbols]

 1 Cleaning Tank 6 Organic Solvent 8 Concentrated Solvent Vapor Layer 9 Vapor Line 11 Suction Hole 12 Duct 13 Suction Blower 14 Condenser 15 Heat Exchanger 16 Oil / Water Separation Equipment 17 Outlet Side Pipe 18 Installation Pipe 19 Blowout Hole

Claims (3)

[Scope of utility model registration request] 1. A suction hole and a blowout hole are provided in the upper part of a cleaning tank for storing an organic solvent, and the space between them is connected by a duct provided with a condenser, a heat exchanger and an oil / water separator, and suction is carried out into the duct. A washer using an organic solvent, characterized by having a blower installed. 2. The washing machine using an organic solvent according to claim 1, wherein the suction hole in the upper part of the washing tank is arranged in the concentrated solvent vapor layer near the vapor line. 3. The washing machine using an organic solvent according to claim 1, wherein the suction blower has a small capacity of 1 m ³ / min or less.