JPS62721Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a distiller that detects abnormalities in dry cleaning machines and the like that use organic solvents such as perchlorethylene, 1.1.1 trichloroethane, and R113.

Here, a conventional dry cleaning process will be outlined using FIG. First, the clothing 2 is put in through the door 1, and the door 1 is closed to start operation. Generally, the steps proceed in the following order.

The solvent 4 is pumped up from the solvent tank 3 through the valve 5 by the pump 6, and the required amount of the solvent 4 is sent into the processing tank 10 through the path consisting of the valve 7 and the filter 8 or the path consisting of the valve 9.

Gently rotate the processing drum 11 and pour the solvent 4 into the processing tank 10, button trap 12, valve 13,
Clothes 2 are washed by circulation through a circuit consisting of pump 6, valve 7, filter 8, or valve 9.

Processing tank 11, button trap 12, valve 1
3, the liquid is drained through the path of the pump 6, the valve 14, and the distiller 15, and then the processing drum 11 rotates at high speed to centrifugally separate the solvent 4 in the clothing 2, and the liquid is drained in the same way.

Repeat the steps in section and section.

Processing tank 11, button trap 12, valve 1
3. Drain the liquid into the solvent tank 3 through the route of the valve 5,
Subsequently, the processing drum 11 rotates at high speed to remove the clothing 2.
The solvent 4 inside is centrifuged and drained.

Next, slowly rotate the processing drum 11 again,
Fan 16, air cooler 17, air heater 18
A recovery air duct 19 and a treatment tank 10 consisting of
Air is circulated between the two in the direction of the arrow 20 to dry the clothing 2. Further, the solvent gas evaporated from the clothing 2 is condensed in the air cooler 17 and collected in the recovery path 21.
It enters the water separator 22 through the solvent pipe 23 and enters the clean tank 24.

When drying is completed, the dampers 25 and 26 open as shown by the broken lines, fresh air is taken in from the damper 25, and uncondensed solvent gas that cannot be recovered by the air cooler 17 is exhausted from the damper 26, thereby deodorizing the solvent odor in the clothing 2. .

The solvent 4 that entered the distiller 15 in the step of section 1.
It evaporates and is condensed and recovered in the condenser 27, enters the clean tank 24 through the water separator 22 and the solvent pipe 23, and returns to the solvent tank 3 through the overflow partition plate 28. Note that the water separated by the water separator 22 is discharged to the outside of the system through a water pipe 29.

Next, a conventional distillation device to which the present invention is applied will be explained in detail with reference to FIGS. 2 and 3. The heating methods for distillers have long been well known, such as heating oil heated by an electric heater and using saturated steam. .

In FIG. 2, during one cycle of cleaning process, the contaminated solvent flowing into the distiller 15 from the contaminated solvent inlet 30 is heated and evaporated by the heat of the steam supplied from the steam valve 31 to the heating section 32, and the solvent gas is released. A system is adopted in which it is guided to a condenser 27 and cooled and recovered. If a large amount of water or surfactant gets mixed into the contaminated solvent for some reason, a bumping phenomenon occurs, and a large amount of bubbles are instantaneously generated, filling the distiller 15 as shown in Figure 3, and connecting pipes. 3
Contaminant solvent bubbles reach the condenser 27 through 3.

If left unattended further, the solvent will pass through the water separator and contaminate the inside of the solvent tank, resulting in trouble that paralyzes the functions of various parts and requires a great deal of time to recover.
Therefore, when bubbles occur, the operator immediately stops the steam valve 31 to prevent the problem from spreading; however, abnormal phenomena occur suddenly.
The reality is that workers are slow to notice the occurrence of an abnormality, often resulting in problems that even the solvent in the solvent tank becomes contaminated.

In addition, in FIGS. 2 and 3, the solvent cooled by the cooling pipe 34, the cooling water inlet 35, and the cooling water outlet 36 and condensed and recovered passes through the solvent recovery pipe 37, passes through the water separator 22, and is transferred to the solvent tank. It will be collected on 3rd. Note 4
7 is a steam drain discharge pipe, and 39 is a bubble of contaminated solvent generated by the bumping phenomenon of contaminated solvent 38 during distillation.

The present invention was proposed in order to eliminate the above-mentioned drawbacks of the conventional methods.In a distiller for recovering solvents in dry cleaning equipment, a sheathed heater and a thermoelectric generator are installed facing into the distillation chamber to maintain an atmosphere at a predetermined temperature. A bubble detection device consisting of an equal temperature detection end and a temperature controller is provided. The bubbling state is detected by detecting a sudden drop in temperature with the temperature controller,
It is an object of the present invention to provide a distiller that can prevent troubles caused by abnormal foaming (referred to as boilover).

The present invention will be described below with reference to the embodiments shown in the drawings. FIG. 4 shows a distiller showing an embodiment of the present invention. The device shown in FIG. 4 includes a foaming detection sensor 40 installed in the upper space of the distiller 15, a temperature controller 44 that adjusts the temperature of the sensor to a set value, and a temperature controller 44 that controls the temperature of the distiller 15. It consists of an indicator 45 that closes the valve 31.

An example of the foam detection sensor 40 is shown in FIG.
A sheathed heater 41 and a temperature detection end 42 such as a thermocouple are placed in a powder 4 with good thermal conductivity in an outer cylinder 46 made of a material with excellent corrosion resistance (for example, stainless steel).
3 (for example, metal powder). In FIG. 4, 27 is a condenser, 30 is a contaminated solvent inlet, 32 is a heating section, 33 is a connecting pipe, and 38 is a contaminated solvent during distillation.

Next, to explain the operation, the contaminated solvent contaminated in the cleaning process is transferred to the distiller 15 from the contaminated solvent inlet 30.
It is evaporated by the large amount of heat of the steam supplied from the steam valve 31 to the heating section 32, and is condensed and recovered by the condenser 27 through the connecting pipe 33. The temperature of the solvent and solvent gas in the distiller is the boiling point temperature of the solvent under atmospheric pressure, for example, 121° C. when perchlorethylene is used as the solvent.

On the other hand, the foaming detection sensor 40 is connected to the sheathed heater 4
1. The temperature detection end 42 and temperature controller 44 maintain the temperature at about 20°C higher than the solvent temperature, or 140°C when perchlorethylene is used as the solvent.

If bubbling occurs for some reason,
When the bubbles gradually rise in the distiller 15 until they come into contact with the bubble detection sensor 40, the bubble detection sensor 40 detects the temperature of the bubbles, and in the case of perchlorethylene.
It is rapidly cooled down to 121° C. against the control ability of the temperature controller 44. This sudden drop in temperature of the foaming detection sensor 40 is detected by the temperature controller 44 and the indicator 4
5 and closes the steam valve 31 to cut off the steam supply. Note that instead of closing the steam valve 31, the solvent inlet 30 may be opened for a short time to introduce cold solvent into the distiller 15. Moreover, if necessary, both may be used in combination, and the foaming phenomenon may be notified to the operator by a buzzer or the like.

As explained in detail above, the present invention is structured so that the foaming phenomenon is detected in the distiller and the steam supply is cut off, so the heating source is lost and no further foaming occurs, and the bubbles are kept inside the distiller. It stayed and gradually subsided,
There is no possibility of contaminating the condenser etc. after the connecting pipe.

Further, when the foam subsides and the foam detection sensor returns to the set value due to the action of the temperature controller, the steam valve is opened again according to the instruction from the indicator to restart distillation.
Therefore, not only does it become unnecessary for operators to monitor the distiller, but it also eliminates troubles such as boilover, which contaminates condensers, water separators, solvent tanks, etc. and requires a lot of manpower and time to recover. , machine operation rate is improved. In addition to stopping the steam supply, even if a cold solvent is introduced, the bubbles are rapidly cooled down and subsided, producing the same effect.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an example of a conventional dry cleaning machine, Figs. 2 and 3 are side sectional views explaining the operating state of a conventional distiller, and Fig. 4 is a side sectional view showing an example of a conventional dry cleaning machine. A side sectional view of the distiller shown in FIG.
It is a detailed sectional view of the foaming detection sensor in the figure. Explanation of the main parts of the diagram, 15... distiller, 40...
... Foaming detection sensor, 41 ... Sheathed heater, 42
...Temperature detection end, 44...Temperature controller, 45...
Indicator, 46...outer cylinder.

Claims (1)

[Scope of utility model registration request] A distiller for recovering solvents in dry cleaning equipment is equipped with a bubble detection device consisting of a sheathed heater facing into the distillation chamber to maintain an atmosphere at a predetermined temperature, a temperature detection end such as a thermocouple, and a temperature controller, The temperature detection end is maintained at a temperature higher than the solvent evaporation temperature, and if the temperature suddenly drops when it comes into contact with foamed foam, the foaming state can be detected by detecting this sudden drop in temperature with the temperature controller. A distiller characterized by detecting.