JPH0636838B2 - Distillation temperature control method in dry cleaning - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to an apparatus for dry cleaning using a solvent, which is capable of efficiently distilling in a stable state when purifying a solvent soiled by washing by distillation. The present invention relates to a distillation temperature control method capable of controlling the distillation temperature.

[Conventional technology]

FIG. 2 is a system diagram showing a conventional dry cleaning device.

Next, a conventional dry cleaning method using this conventional apparatus will be described.

The cleaning tank 1 has a structure in which an inner case 1b made of a perforated plate is rotatably installed inside an outer case 1a.

In the cleaning process, the clothes to be cleaned such as clothes are put in the inner case 1b, the solvent in the solvent tank 2 is sucked and pumped by the pump 3, and the cleaning is performed through the filter 5, the cooler 6 and the valve 8. Pour into tank 1. At this time, the liquid surface of the solvent in the cleaning tank 1 is detected by the liquid surface float 9 and automatically controlled.

The detergent required for cleaning is sucked up by the detergent injector 12 from the cleaning can 11 and supplied to the cleaning tank 1 in a fixed amount.

Then, the cleaning process is performed by rotating the inner case 1b at a low speed.

When the washing process is completed, the valve 10 is opened, and the solvent in the washing tank 1 is flowed into the distiller 14 after the coarse foreign particles are removed by the button trap 13.

The distiller 14 is provided with a heating jacket 24. Steam for heating is supplied to the heating jacket 24 to heat the solvent in the distiller 14. An on-off valve 26 is provided in the heating steam supply pipe.

The solvent vapor generated by heating in the distiller 14 is cooled and condensed in the still condenser 25, the moisture is removed by the moisture separator 28, and stored in the clean oil tank 23.

On the other hand, the cleaned object in the cleaning tank 1 from which the solvent has been discharged is rinsed after being lightly drained by rotating the inner case 1b.

Rinsing is performed by injecting the solvent, which has been distilled and purified, stored in the clean oil tank 23 into the cleaning tank 1 and rotating the inner barrel 1b at a low speed.

When the rinsing is completed, the valve 10 is opened to allow the solvent in the cleaning tank 1 to flow into the solvent tank 2 via the button trap 13. Then, the inner barrel 1b is rotated at a high speed for several minutes to perform the liquid removing step.

Then, a drying process is performed. Valve in the drying process
21 and 23 are in the open state, the three-way valve 16 is switched to the circulation direction, and the fan 15 is operated while rotating the inner case 1b at a low speed. The air sent from the fan 15 is a three-way valve 1
6, primary capacitor 17a, secondary capacitor 17b, heater 1
9. The cleaning tank 1 and the dust filter 20 are sequentially circulated, and then sucked into the fan 15 and circulated.

The circulating air flow is heated into hot air when passing through the heater 19, and evaporates the solvent remaining on the object to be washed when passing through the cleaning tank 1. The air flow containing the solvent vapor is sucked into the fan 15 via the dust filter 20 and sent out, and then is cooled by cold water when flowing through the three-way valve 16 and the primary condenser 17a, and when flowing through the secondary condenser 17b. It is cooled by the refrigerant sent from the refrigerator 17c. The solvent vapor contained in the cooled air flow is condensed and recovered, the moisture is removed by the moisture separator 28 and stored in the clean oil tank 23. As described above, the drying step is performed concurrently with the operation of evaporating the solvent remaining in the object to be washed to dry the object to be washed and the operation of condensing and recovering the evaporated solvent vapor. .

The distillation step is performed after the washing step and before the drying step.

The above-mentioned distillation needs to be carried out in a state where the amount of evaporation from the distiller 14 and the cooling capacity of the still condenser 25 are balanced. Therefore, as shown in FIG.
A temperature detection sensor 29 is provided in the evaporation tank of the control unit 30 and the opening / closing valve 26 is controlled by the control unit 30 based on the detection value of the temperature detection sensor.
Is controlled to open and close.

[Problems to be Solved by the Invention]

Conventionally, as described above, since the temperature detection sensor 29 is disposed in the evaporation tank of the distiller 14, the surface of the temperature detection sensor is contaminated by the solvent, and accurate temperature detection cannot be performed. There is a possibility that the heating temperature becomes too high and the balance between the evaporation amount and the cooling capacity of the condenser becomes unbalanced, and the dirty solvent in the evaporation tank blows out into the still condenser 25 (this phenomenon is called bumping phenomenon). Further, if distillation is carried out at a high temperature for a long time, decomposition of the solvent is promoted, which may adversely affect the entire apparatus. Therefore, conventionally, there is a problem that the inside of the distiller must be frequently cleaned, which is troublesome.

The present invention solves the problems of the prior art as described above, prevents the bumping phenomenon during the distillation step, does not decompose the solvent, and can efficiently perform distillation temperature control in a dry cleaning device. The purpose is to provide a method.

[Means for Solving the Problems]

In order to achieve the above object, the present invention provides a cleaning step of supplying a solvent to a cleaning tank rotating at a low speed to clean an object to be cleaned in the cleaning tank, and rotating the cleaning tank at a high speed after completion of the cleaning step. After the liquid removal process of removing liquid from the object, and after the completion of the liquid removal process, the cleaning tank is connected to the drying path to circulate the heated air between the cleaning tank and the drying path, and the vaporized solvent is condensed by the condenser. In a dry cleaning device that performs a drying / solvent recovery step for recovering and a distillation step for distilling and purifying the dirty solvent by the cleaning step after the cleaning step, an automatic opening / closing valve and a manual valve are provided in a vapor supply pipe leading to the distiller. A pressure reducing valve is installed, and a temperature detecting sensor is directly installed in the heating jacket of the distiller, and the manual pressure reducing valve is adjusted to obtain a desired temperature, and the temperature detecting sensor is installed. Closing the on the basis of the detected value the automatic opening and closing valve when detecting the desired temperature more support, characterized in that none to control so as to open at the time of detection desired temperature or less.

[Action]

According to the present invention, as described above, since the temperature detecting sensor is arranged in the heating jacket of the distiller, the temperature detecting sensor is less contaminated and the accurate vapor temperature can be detected for a long time, and the decompression is performed. Since the valve is adjusted to obtain the desired temperature, the steam temperature normally maintains the desired temperature set by the pressure reducing valve, but if it rises above that for some reason, the on-off valve is closed and set as desired. When the temperature is returned to the desired temperature and the temperature falls below the desired temperature, the on-off valve is opened, and thus bumping and decomposition of the solvent can be prevented, and smooth and efficient distillation can be performed.

〔Example〕

 An example of the embodiment of the present invention will be described below with reference to FIG.

FIG. 1 shows the structure of a dry cleaning apparatus to which the present invention is applied. The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

In the present invention, the temperature detection sensor 29 is arranged directly in the heating jacket 24 of the still 14, and the automatic opening / closing valve 26 and the manual pressure reducing valve 31 are arranged in the steam pipe leading to the still 14, Manual decompression valve 31 for desired steam temperature, eg 150 ° C
When the vapor pressure is set to 4 kg / cm ² and the temperature detection sensor 29 detects that the temperature has reached the set temperature (150 ° C.) or higher, the control unit 30 closes the automatic opening / closing valve 26 to slightly lower the set temperature. When it is detected that the temperature is low, for example, 147 ° C. or less, the opening / closing control is performed so that the automatic opening / closing valve 26 is opened. Other configurations are similar to those of the conventional example shown in FIG. In FIG. 1, P1 is a pressure gauge.

According to the present invention, as described above, the temperature detecting sensor 29 is arranged in the heating jacket 24 of the still, so that the temperature detecting sensor 29 can detect the accurate vapor temperature without being contaminated by the dirty solvent. Since the desired steam temperature can be set by the manual pressure reducing valve 31, the steam temperature sent to the distiller normally tries to maintain the temperature set in the pressure reducing valve, but some cause such as the primary side Should the temperature rise above the set temperature due to fluctuations in temperature or pressure, the temperature detection sensor 29 will detect it and the control unit 30 will close the open / close valve 26.If the temperature is below the set temperature, the open / close valve 26 will be opened in the same manner. Maintaining 150 to 147 ° C prevents bumping and decomposition of solvent, and enables smooth and efficient distillation.

〔The invention's effect〕

As described above, according to the present invention, when diluting a dirty solvent in a dry cleaning device, bumping and decomposition of the solvent can be prevented, and smooth and efficient distillation can be performed. .

[Brief description of drawings]

FIG. 1 is a system diagram showing a configuration of a dry cleaning device to which the present invention is applied, and FIG. 2 is a system diagram showing a configuration of a conventional dry cleaning device. 1 ... Cleaning tank, 2 ... Solvent tank, 3 ... Pump, 5 ...
… Filter, 6… Cooler, 9… Liquid level float, 13…
… Button trap, 14… Distiller, 15… Juan, 17a
…… Primary capacitor, 17b …… Secondary capacitor, 19 ……
Heater, 20 ... dust filter, 23 ... clean oil tank,
24 ... Heating jacket, 25 ... Still condenser, 26 ...
… Automatic open / close valve, 29 …… Temperature detection sensor, 30 …… Control section,
31 …… Reducing valve.

Claims (1)

[Claims] 1. A cleaning step of supplying a solvent to a cleaning tank rotating at a low speed to clean an object to be cleaned in the cleaning tank, and a cleaning tank rotating at a high speed after completion of the cleaning step to remove liquid from the object to be cleaned. After completion of the liquid process and the dewatering process, the washing tank is connected to the drying system passage to circulate the heated air between the washing tank and the drying passage, and the vaporized solvent is condensed by the condenser and recovered. In a dry cleaning device that performs a recovery step and a distillation step for distilling away and purifying the solvent contaminated by the cleaning step after completion of the cleaning step, an automatic opening / closing valve and a manual pressure reducing valve are arranged in a vapor supply pipe leading to the distiller. The temperature detecting sensor is installed directly in the heating jacket of the distiller, and the manual pressure reducing valve is adjusted to obtain the desired temperature. Based on the detected value of the temperature detecting sensor. Closing the serial automatic opening and closing valve when detecting more than a desired temperature, distillation temperature control method in dry cleaning, characterized in that none to control so as to open at the time of detection desired temperature or less.