JPH0137162B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to automatically suppress foam when it occurs during distillation.

Because the solvents used in dry cleaners are used over and over again, dirt accumulates. For this reason, it is necessary to distill the solvent periodically, but the boiling point of the solvent with accumulated dirt increases, resulting in severe foaming during distillation. The pressure drop caused by the low temperature of the condenser and water separator also has an effect.
Bubbles generated in the still sometimes flow rapidly into the solvent tank through the condenser and water separator. This is generally called the bumping phenomenon. However, since the foam contains water and dirt, all of the solvent in the tank becomes contaminated, and it is necessary to distill it again.

In order to avoid this kind of bumping phenomenon, for example, the system disclosed in Japanese Utility Model Application Publication No. 1983-38034 stops the heating steam when bubbling is detected, and blows a part of the steam into the distiller. The bubbles were blown out.

However, with this, heating power remains, so even if the bubbles are blown out, bubbles continue to form for a while, and it takes time to suppress the bubbles. It was necessary to increase the size of the vessels.

When foaming is detected, the present invention not only turns off the heater, but also injects the low-temperature solvent in the tank into the distiller to rapidly cool it, suppressing foaming almost instantly, and facilitating processing in the next stage. It is something.

To explain based on the following examples, 1 is a washing tub;
2 is a solvent tank, and 3 is a liquid supply pump. When washing starts, the solvent in the solvent tank 2 is supplied to the washing tub 1 through the one-way valve 4 and the liquid supply valve 5 by the liquid supply pump 3.
supplied to Reference numeral 6 denotes a drain pump installed in the solvent passage 7. During washing operation, this drain pump drains the solvent in the washing tub 1 through the one-way valve 8 and the solenoid valve 5.
It circulates through.

Reference numeral 9 denotes a drying ventilation passage whose both ends are connected to the washing tub 1, and a filter 10, a float switch 11, a blower 12, a condenser 13, and a heater 14 are provided in the ventilation passage. During the above-mentioned washing operation, the solvent enters the drying ventilation passage 9 up to the position of the float switch 11, and the solvent level in the washing tub 1 is controlled by the float switch 11. The heater 14 has a meandering shape, and one end thereof is connected to a distiller 15, which will be described later, and the other end is connected to a water separator 16, which is further connected to the solvent tank 2. There is. On the other hand, condenser 1
3 also has a serpentine shape, one end of which connects to the outflow side A of the water chiller, and the other end of which connects to the inflow of the water chiller through the cooling coil 17 in the water separator 16 and the cooling coil 18 in the solvent tank 2. Connected to side B. Reference numeral 19 denotes a solvent recovery pipe for recovering the solvent condensed in the condenser 13, which once collects the solvent in the collected liquid collecting tank 20 and then flows it to the water separator 16 via the electromagnetic valve 21. . Reference numerals 22 and 23 are an intake valve and an exhaust valve, respectively, which are located at the positions indicated by the broken lines in the figure during the drying process, and close the intake port 24 and exhaust port 25 provided in the drying ventilation path.
During the deodorizing process after the drying process, the position is switched to the solid line position shown in the figure, and the drying air passage 9 is shut off, while at the same time the intake port 24 and the exhaust port 25 are opened. 26 is a motor that drives the blower 12.

The distiller 15 connects the outlet 27 of the evaporated solvent vapor to the heater 14, and
A solvent inlet 28 is connected to the solvent passage 7 via a drain valve 29 . Also this distiller 1
5 is connected to the distillation chamber 33 and the heating chamber 3 via the partition plate 32.
A first electric heater 35 and a second electric heater 36 are provided in this heating chamber, and the water in the heating chamber is heated by these heaters, and the solvent in the distillation chamber 33 is heated by the steam. I try to do that. On the other hand, a light emitter 37 is provided on one side of the distillation chamber 33, and a light receiving element 38 that receives the light is provided on the other side. 39 is a pressure switch for detecting the pressure inside the heating chamber 34.

Figure 3 shows a circuit for detecting the bubbling state.
a series circuit consisting of the light receiving element 38 and a resistor 40;
A series circuit consisting of two resistors 41 and 42 and a light emitter 37 are connected between DC power supply terminals 43 and 43, and one end of the resistor 41 is connected to a comparator 44.
, and one end of the light emitter 37 is connected to a comparison voltage input terminal of the comparator 44 . Further, a first relay 46 is connected to the output terminal of the comparator via a transistor 45.

Figure 4 is the electrical circuit diagram of the entire dry cleaner.
47 is the main switch, 48 to 53 are the first to
a sixth program switch; 54 is a program timer motor; 55 is a drum reversing circuit for reversing the rotation of the drum in the washing tub 1;
is connected in series with the second program switch 49. 56 is a second relay, which closes normally open contacts 56a and 56b when energized and at the same time closes normally closed contacts 56.
c, 56d, and is connected in series with the float switch 11. 57 is an electromagnetic switch for the liquid supply pump, and the drain valve 29
is connected in series with the third program switch 50. 58 is an electromagnetic switch for the drain pump,
Reference numeral 59 denotes a deliquid circuit, and 60 a first delay relay, which closes the normally open delay contact 60a and at the same time opens the normally closed delay contact 60b when a certain period of time has elapsed after energization. 61 is a third relay, 62 is a second delay relay, and when a certain period of time has passed after energization, the delay normally closed contact 6
2a. 63 is a drying circuit, 64 is an electromagnetic switch for the first heater, and a normally closed delay contact 60b
and the pressure switch 39, the second electric heater electromagnetic switch 65 is connected in series with the normally closed contact 61a, and this series circuit is connected in parallel with the first heater electromagnetic switch 64. There is. 66 is a deodorizing circuit.

The operation will be explained below. During the cleaning process, the first and second program switches 48 and 49 are closed, so at the same time as the drum reversing circuit 55 is energized, the liquid supply valve 5 is energized to open, and the liquid supply pump electromagnetic switch 57 is energized to supply the liquid. liquid pump 3
rotates and transfers the solvent in tank 2 to washing tub 1.
When a certain amount of solvent enters the washing tub, the float switch 11 closes, and the second relay 56 is energized, so the normally closed contact 56c opens, and the electromagnetic switch 5 for the liquid supply pump closes.
The power supply to 7 is cut off and the liquid supply ends. On the other hand, since the normally open contact 56b is closed, the drain pump electromagnetic switch 58 is energized, the drain pump 6 rotates, and the solvent in the washing tub 1 is circulated through the filter 10 for cleaning.

When moving to the draining process, the third program switch 50
is closed, the drain valve 29 is energized and opened, and the drain pump electromagnetic switch 58 is also energized continuously, so that the solvent in the washing tub 1 is transferred to the distiller 15 by the drain pump 6. It will be done.

When the liquid removal process begins, the fourth program switch 51
is closed, and the liquid removal circuit 59 is energized. The solvent discharged by the draining is also transferred to the distiller 15 by the drain pump 6.

When the drying process begins, the first and fifth program switches 48 and 52 are closed. As a result, the electromagnetic switches 64 and 65 for the first and second heaters are energized, the first and second heaters 35 and 36 generate heat, and at the same time, the drum reversing circuit 55 and the drying circuit 63 are energized. do. When the drying circuit 63 is energized, the blower 12 in the circulation ventilation path 9 rotates, and at the same time cooling water flows into the condenser 13, and the intake and exhaust valves 22,
23 closes the intake hole 24 and the exhaust hole 25, respectively.
On the other hand, since the solvent vapor evaporated in the distiller 15 is flowing in the heater 14, its latent heat of condensation heats the air flow flowing in the circulation ventilation passage 9, and converts this into hot air for washing. The solvent is blown into the tank 1 to evaporate the solvent contained in the clothes. Note that the evaporated solvent is liquefied in the condenser 13 and recovered.

On the other hand, the solvent contained in the distiller 15 is distilled during this drying process, but when the foaming becomes severe during distillation and the bubbles rise to level A in FIG. Since the light reaching the light is blocked by this bubble, the resistance of the light receiving element 38 increases, and the voltage applied to the comparison voltage input terminal of the comparator 44 in FIG. A signal current flows from
Transistor 45 becomes conductive and current flows through first relay 46 . As a result, the normally open contact 46a in FIG. 4 closes and the first delay relay 60 is energized.
Delay normally closed contact 60 when about 0.5 seconds have passed after energization
b, open the first and second heater electromagnetic switches 64,
The first and second heaters 35,
Stop the heat generation of 36. On the other hand, when the aforementioned 0.5 seconds have elapsed, the delayed normally open contact 60a closes, and the third relay 61
is energized to close the normally open contact 61a to maintain self-holding, and the normally open contacts 61b and 61c are closed to energize the electromagnetic switch 57 for the liquid supply pump and the electromagnetic switch 58 for the drain pump, so that the liquid supply pump 3 and Drain pump 6
is rotated to transfer the solvent in the tank 2 to the washing tub 1 and then put it into the distiller 15. This solvent has a lower temperature than the solvent being distilled, so it
The inside of 5 is rapidly cooled and the bubbles quickly disappear. Further, when the normally open delay contact 60a closes, the second delay relay 62 is energized, and when a certain period of time has elapsed, the normally closed delay contact 62a opens, so that the supply pump electromagnetic switch 57 is deenergized. Furthermore, since the power to the second relay 56 is also cut off, the normally open contact 56b opens, and no current flows to the drain pump electromagnetic switch 58 either. As a result, the injection of low temperature solvent into the distiller 15 ends.

On the other hand, when the bubbles disappear, the light receiving element 38 receives light again, so the transistor 45 becomes non-conductive and the first
No current flows through the relay 46, and the normally open contact 4
6a returns to open state. As a result, the normally open contact 60
When the contact a returns to open, the delayed normally closed contact 60b closes. Even if the delayed normally open contact 60a opens, the third relay 61 is energized by the self-holding circuit, so the normally closed contact 61d remains open. As a result, current flows only through the first heater electromagnetic switch 64 and only the first heater 35 generates heat, restarting distillation at a lower temperature than before foaming occurred. When the distillation is completed, the pressure inside the heating chamber 34 of the still rises rapidly, so the pressure switch 39 opens the contact and finishes the distillation. At this time, the clothes in the washing tub 1 are completely dry.

When the deodorizing process begins, the sixth program switch 53
is closed, the deodorizing circuit 66 is energized, the blower 12 in the drying ventilation path 9 is rotated, and the intake port 24 and the exhaust port 25 are opened to expel the odor remaining in the washing tub 1.

As described above, the present invention automatically turns off the heater and injects low-temperature solvent when bubbling is detected by the light-emitting and light-receiving elements, so that the distillation solvent is rapidly cooled and bubbling is instantly suppressed at the source, allowing heated distillation to proceed smoothly. This allows for faster restarts and more efficient distillation operations. Also,
Since no impurities such as water are used to suppress foaming, it is possible to suppress the boiling point rise and prevent frequent foaming when restarting, and it also facilitates the next stage of impurity treatment.
It is possible to avoid increasing the size of the device.

Furthermore, in the present invention, since a part of the heater is used when heating distillation is restarted, heating distillation can be continued with gentle heating so that foaming is less likely to occur, and the entire distillation operation can be carried out efficiently.

[Brief explanation of drawings]

Fig. 1 is a solvent circuit diagram of a dry cleaner equipped with the distillation device of the present invention, Fig. 2 is a vertical side view of the distiller,
Figure 3 is a circuit diagram for monitoring foaming in the distiller, Figure 4 is an electrical circuit diagram of the entire dry cleaner,
FIG. 5 is a programming diagram. 15... distiller, 35... first heater, 36...
...second heater, 37...light emitter, 38...light receiving element.

Claims (1)

[Scope of Claims] 1. In a distillation apparatus in which used solvent is heated and distilled in a distiller and recycled solvent is returned to a tank, the distiller is provided with a light emitter and a light receiving element in addition to a heater, and the distiller is heated by the heater. When the solvent in the distiller bubbles and the bubbles block the light from the light emitting element to the light receiving element, the heat generation of the heater is cut off and the low temperature solvent in the tank is injected into the distiller. A distillation device that is characterized by 2. In a distillation device that heats and distills used solvent in a distiller and returns recycled solvent to a tank, the distiller is provided with a light emitter and a light receiving element in addition to a heater, and the distiller is heated by the heater. When the solvent bubbles and the bubbles block the light from the light emitting element to the light receiving element, the heat generation of the heater is cut off and the low temperature solvent in the tank is injected into the distiller. A distillation apparatus characterized in that after injecting the water, heating is restarted by a part of the heater.