JPS6157798B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dry cleaner that completely carries out distillation by reducing the pressure inside the still.

In order to increase the effectiveness of solvent recovery, the idea of reducing the pressure inside the distiller during distillation was already presented in Japanese Patent Publication No. 16589/1983. However, when a vacuum pump is connected between the distiller and the condenser in order to reduce the pressure inside the distiller, a large amount of air enters the condenser, reducing the ability to condense the solvent. Therefore, in the above publication, after reducing the pressure inside the distiller with a vacuum pump,
The inlet and outlet sides of this vacuum pump are shut off, and the vacuum pump is bypassed so that the solvent vapor evaporated from the distiller is guided to the condenser. Therefore, if the distillation operation is continued for a long time, the pressure inside the still will increase, making it impossible to achieve the desired purpose.

Therefore, in the present invention, an air pipe is connected to a drying ventilation passage whose both ends are connected to a washing tub, an ejector is inserted in the middle of the pipe, and one end of the distillation pipe is connected to a distiller, and the other end of the distillation pipe is connected to the ejector. By connecting to the low-pressure part, the inside of the distiller is continuously maintained at a low pressure during distillation operation to increase the distillation effect, and the solvent evaporated from the distiller is condensed and recovered by a cooler for drying laundry. By doing so, the purpose is to also improve the condensation effect of solvent vapor.

That is, one end of the distillation pipe is connected to the distiller, and the other end is connected to the low-pressure part of the ejector to reduce the pressure inside the distiller during distillation operation, and at the same time, the solvent sucked into the ejector is used as a drying ventilation for drying laundry. blow into the road,
By condensing the solvent in the cooler in the ventilation passage, even if the solvent contains a large amount of air, the condensation efficiency is not reduced.

The following description will be given based on an example. 1 is a solvent tank, 2 is a circulation pump, 3 is a filter, and 4 is a washing tub. During the washing process, the solvent is circulated through these parts by the circulation pump. Reference numeral 5 denotes a drying ventilation passage whose both ends are connected to the washing tub, and a lint filter 6, a blower 7, a cooler 8 and a heater 9 are installed inside the drying ventilation passage.
In addition, cutoff valves 10, 10 are provided on both sides of the cooler and heater to shut off the drying ventilation path 5, and an air intake port 1 formed on the side wall of the drying ventilation path is provided.
1 and an exhaust port 12 are provided. The cooler 8 and heater 9 have the same structure as a normal radiator in which a large number of plate-like fins are attached to meandering refrigerant and heat medium passages.

During the drying process, the intake valve 13 and the exhaust valve 14 close the intake port 11 and the exhaust port 12, and the cutoff valves 10 and 10 open the drying ventilation passage 5, so that the air heated by the heater 9 is passed through the blower 7. By circulating the solvent in the drying air passage 5, the solvent is evaporated from the laundry in the washing tub and condensed in the cooler 8. The condensed solvent then enters the water separator 16 through the valve 15 and is further transferred to the solvent tank 1.
will be collected.

During the deodorizing process, the cutoff valves 10, 10 shut off the drying air passage 5, and the intake valve 13 and the exhaust valve 14 open the intake port 11 and the exhaust port 12. Therefore, intake port 1
Fresh air is sucked in from 1, and the solvent vapor filling the washing tub 4 is pushed out from the exhaust port 12.

Reference numeral 17 denotes an air pipe whose base end is connected to an air compressor and whose distal end is connected to the vicinity of the cooler 8 of the drying ventilation passage 5. Air flowing from the air pipe 17 passes through the cooler 8. An exhaust pipe 18 is connected between this drying ventilation path 5 and the exhaust port 12 so that the drying air is discharged from the drying air passage 5.

There is an ejector 19 in the air pipe 17.
is inserted between the low pressure part of the ejector and the distiller 2.
0 through a distillation pipe 21. Also, a condenser 22 is installed at the part that branches off from this distillation pipe.
and the condenser is connected to the water separator 16.

When distilling a solvent, the valve 23 is opened and the solvent in the filter 3 is pumped into the distiller 2 together with a filter material such as diatomaceous earth.
0 and perform distillation. The solvent vapor evaporated by heating in the distiller 20 is transferred to the condenser 2.
After being condensed in the solvent tank 2, it flows into the water separator 16 and is further collected in the solvent tank 1. When the solvent in the distiller 20 has almost completely evaporated, the air compressor is operated to forcefully flow air into the air pipe 17.
The pressure inside the distiller 20 is reduced by the ejector 19.
Due to the reduced pressure, the solvent contained in the residue in the distiller 20 is completely evaporated, and the evaporated solvent is sucked into the ejector 19 and blown out into the drying ventilation path 5 through the air pipe 17. This air containing the solvent is blown out into the drying air passage 5 and then passes through the cooler 8. At this time, the solvent contained in the air is condensed and recovered, and only the air is exhausted through the exhaust pipe 18. Ru. Therefore, all the solvent contained in the residue in the distiller 20 is recovered.

The condenser 22 temporarily stores solvent vapor and condenses it, whereas the cooler 8 condenses the solvent contained in the air as it flows over its surface. This cooler is designed to be suitable for
has a lower solvent condensation effect than condenser 22,
Therefore, it is not a good idea to use the ejector 19 to flow the solvent vapor toward the cooler 8 from the beginning of distillation. However, if the capacity of the cooler 8 is increased, the solvent vapor may be allowed to flow toward the cooler 8 from the initial stage of distillation.

As described above, in the present invention, an ejector is inserted into the air passage whose one end is connected to the drying ventilation passage, and the low pressure part of this ejector is connected to the distiller, so that the pressure inside the distiller is reduced by the ejector, and the solvent is evaporates easily, and even the solvent contained in the residue is all evaporated and recovered. Also, the cooler in the drying air passage is designed in the most convenient shape to condense the solvent from the mixture of air and solvent vapor to dry the laundry, so that a large amount of solvent vapor and Even if air is mixed in, the condensation efficiency will not be reduced like in a condenser dedicated to distillation. Furthermore, since the cooler is suitable for condensing only the solvent from the mixture of air and solvent, the ejector can be operated continuously to reduce the pressure in the still;
The solvent in the distiller can be efficiently evaporated.

[Brief explanation of the drawing]

The drawing is a solvent circuit diagram of the dry cleaner of the present invention. 4...Washing tub, 8...Cooler, 9...Heater,
7... Blower, 5... Drying ventilation path, 17... Air pipe, 19... Ejector, 20... Distiller, 2
1... Distillation pipe.

Claims (1)

[Claims] 1. Other than a distillation pipe, in which both ends are connected to a washing tub, an air pipe is connected to a drying ventilation passage with a cooler/heater and a blower installed inside, an ejector is inserted in the middle of the pipe, and one end is connected to a distiller. A dry cleaner whose end is connected to the low pressure part of this ejector.