JPS6213593Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dry cleaner with low solvent loss.

In dry cleaners equipped with a distillation device, the pressure inside the solvent condensation condenser fluctuates during distillation, so it is necessary to connect an exhaust pipe and an intake pipe to the condenser, or to install a pressure equalizing pipe that serves as both pipes. Although pressure fluctuations in the distillation condenser are reduced by connecting the pipes, the solvent often leaks as vapor from the pipes, which not only causes solvent loss but also contaminates the air in the workplace. It was also getting old.

The present invention is intended to eliminate such drawbacks, and the present invention will be explained below following the conventional example.

Figure 1 shows a conventional example, where 1 and 2 are a first solvent tank and a second solvent tank, 3 is a pump, 4 is a washing tub, and 5
is a button trap that collects buttons, lint, etc. that come off during washing, and these traps make up the solvent circuit.
Washing is performed twice, and during the first washing process, the valve 6 is opened, the pump 3 is rotated, and the solvent in the first solvent tank 1 is poured into the washing tub 4.

7 is a distiller, 8 is a condenser for condensing solvent vapor, and 9 is a water separator for separating water from the condensed solvent, and these constitute a distillation apparatus. When the first washing is completed, the valve 10 is opened and the solvent in the washing tub 4 enters the distiller 7, where it is distilled. That is, the heater in the distiller 7 generates heat to evaporate the solvent, and the evaporated solvent is cooled and condensed in the condenser 8. The condensed solvent enters a water separator 9 where water is separated and only pure solvent is collected in the second solvent tank 2.

After the first washing is finished and the solvent in the washing tub 4 is put into the distiller 7, the valve 11 is opened and the pump 3 is rotated, and the solvent in the second solvent tank 2 is put into the washing tub 4. The second washing is then carried out. When the second washing is completed, the valve 12 is opened and the solvent in the washing tub 4 is collected into the first solvent tank 1, after which dehydration and drying are performed. Drying is
Air heated by a heater installed in the collection tank 13 is blown into the washing tub 4 to evaporate the solvent from the clothes in the washing tub, and the evaporated solvent is sucked into the collection tank 13 again. This is done by condensing it in the condenser inside. The condensed solvent enters the water separator 9 through the valve 14 and then into the second solvent tank 2.
will be collected. At the end of this drying process, the exhaust valve is opened and the remaining solvent vapor is exhausted to the outside through an exhaust port 15 protruding from the recovery tank and an exhaust duct 16.

However, during the above-mentioned distillation, solvent vapor flows from the distiller 7 into the condenser 8, so that the pressure inside the condenser 8 increases. If the pressure becomes too high, there is a risk that this condenser will burst, so generally an exhaust pipe 17 is provided between the water separator 9 and the exhaust port 15 to reduce the pressure inside the condenser 8. I'm trying to let it escape. However, when the first distillation is finished and a new solvent is put into the still 7 for the second distillation, the still is cooled by the solvent and the internal pressure decreases, and the exhaust pipe is discharged from the exhaust port 15. 1
7. Try to suck air through the water separator 9 and condenser 8. At this time, the water in the water separator 9 may be sucked into the condenser 8 together with this air, and the water separated from the solvent will be mixed with the solvent again. Conventionally, an intake pipe 19 having a check valve 18 is connected to the capacitor 8, and when the pressure in the capacitor 8 becomes negative, air is sucked in from the intake pipe 19 to keep the pressure constant. However, if the check valve 18 is malfunctioning, when the pressure inside the condenser 8 becomes high, solvent vapor may flow back through the check valve 18 and blow out into the workplace, contaminating the air in the workplace. It was hot. If the check valve 18 is operating normally, when the pressure inside the condenser 8 becomes high, the solvent vapor therein will flow out to the exhaust port 15 through the water separator 9 and the exhaust pipe 17. The solvent vapor flowing out of the exhaust port is discharged into the atmosphere through the exhaust duct 16, which causes air pollution and solvent loss.

In contrast, in the present invention, as shown in FIG. 2, an intake pipe 19 having a check valve 18 is connected between the condenser 8 and the exhaust port 15. As a result, when the pressure inside the condenser 8 increases during distillation, the pressure air escapes to the exhaust port 15 via the water separator 9 and the exhaust pipe 17, and the solvent contained in this escaped air is removed from the exhaust port 15. It's floating inside. Therefore, when the pressure inside the condenser 8 decreases during the second distillation, the air inside the exhaust port 15 flows into the intake pipe 1.
Since the solvent vapor that was floating in the exhaust port 15 at this time is also sucked into the condenser 8 again, there is little loss of solvent and it is less likely to cause air pollution. Note 20, 21
is a pressure equalizing pipe that maintains atmospheric pressure inside a solvent tank or button trap.

FIG. 3 shows another embodiment. In this embodiment, the condenser 8 also serves as a water separator, the details of which are shown in FIG. That is, this condenser 8 has a steam/water separation tube 2 inside an outer casing 22.
3 and a cooling coil 24, and an overflow pipe 25 and a solvent outflow pipe 26 protrude into the steam/water separation cylinder 23 from the bottom surface of the casing. 27 is a shielding pipe for preventing water from overflowing from the solvent outflow pipe 26. The exterior casing 22 also includes a solvent vapor inlet 28 into which the solvent vapor evaporated in the distiller 7 flows;
It is provided with a liquid solvent inlet 29 through which the solvent condensed in the solvent recovery tank 13 flows, and is connected to a pressure equalizing pipe 30 for releasing the pressure inside the exterior casing 22. The pressure equalizing pipe branches into an exhaust pipe 17 and an intake pipe 19 at its distal end, and the distal ends of the exhaust pipe and intake pipe are connected to the exhaust port 15, respectively. The intake pipe 19 is provided with a check valve 18 that opens immediately when the condenser 8 becomes negative pressure, and the exhaust pipe 17 is provided with a check valve 18 that opens when the pressure inside the condenser 8 exceeds a certain value. A valve 31 is provided.

Therefore, in this embodiment, when the pressure inside the condenser 8 exceeds a certain value during distillation, the check valve 17 in the exhaust pipe is pushed open to release the pressure to the exhaust port 1.
Escape within 5. At this time, solvent vapor also flows into the exhaust port, but this solvent vapor floats to the exhaust port 15. When the solvent is put into the still 7 during the second distillation, the inside of the still 7 and the condenser 8 become negative pressure, and the check valve 1 installed in the intake pipe 19
8 opens immediately and the condenser 8 is removed from the exhaust port 15.
Air is sucked into the exhaust port 15 to keep the pressure constant, and the solvent vapor that has been floating in the exhaust port 15 is also sucked in and recovered, so there is little loss of solvent.

As described above, in this case, the tips of the intake pipe 19 and the exhaust pipe 17 are both connected to the exhaust port 15 provided in the recovery tank, so that the solvent vapor flowing out to the exhaust port 15 through the exhaust pipe 17 during distillation is When the solvent is introduced into the distiller 7 during the next distillation, it is sucked into the condenser 8 again through the suction pipe 19, reducing solvent loss, and the check valve 1
Even if a large amount of solvent vapor leaks out due to a failure of the vents 8 and 31, it will not contaminate the air in the workplace because it will be guided from the exhaust port 15 to a predetermined position through the exhaust duct 16.

[Brief explanation of the drawing]

Figure 1 is a conventional dry cleaner solvent circuit diagram.
2 and 3 are solvent circuit diagrams of the dry cleaner of the present invention in mutually different embodiments, and FIG. 4 is a longitudinal sectional side view of a distillation capacitor used in the dry cleaner of FIG. 3. 7... Distiller, 8... Condenser, 9... Water separator, 13... Recovery tank, 15... Exhaust port, 17...
...Exhaust pipe, 18...Check valve, 19...Intake pipe.

Claims (1)

[Scope of utility model registration request] In a device equipped with a distillation device consisting of a distiller, a condenser, and a water separator, and a recovery tank for recovering the solvent from clothes in the washing tub, an exhaust port provided in the recovery tank and the condenser or water separator are connected to each other. In addition, an exhaust pipe is provided to release the pressure inside the condenser when it becomes high, and a check valve is inserted between the exhaust port and the condenser, which opens when the pressure inside the condenser becomes negative. A dry cleaner with a pipe.