JPH0121672Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a solvent recovery control device for a dry cleaning machine that uses organic solvents such as perchloroethylene, 111 trichloroethane, and R113.

For example, as shown in the system diagram of FIG. 1, a dry cleaning machine cleans clothing 2 placed into a processing drum 11 through a door 1 using the organic solvent described above in the following steps.

(1) The solvent 4 is pumped up from the solvent tank 3 through the valve 5 with the pump 6, and the required amount 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.

(2) Slowly rotate the processing drum 11 and pour the solvent 4 into the processing tank 10, button trap 12, and valve 1.
3. Clothes 2 are washed by circulation through a circuit consisting of pump 6, valve 7, filter 8 or valve 9.

(3) Solvent processing tank 11, button trap 12, valve 13, pump 6, valve 14, distiller 15
Subsequently, the processing drum 11 is rotated at high speed to centrifugally separate the solvent 4 in the clothing 2, and the liquid is drained in the same manner.

(4) Repeat steps (1) and (2).

(5) Transfer the solvent to the solvent tank 3 through the processing drum 11, button trap 12, valve 13, and valve 5.
Then, the processing drum 11 is rotated at high speed to centrifugally separate the solvent 4 in the clothing 2, and the liquid is drained.

(6) The processing drum 11 is slowly rotated again, and air is circulated in the direction of the arrow 20 between the recovery air duct 19 consisting of the fan 16, the air cooler 17, and the air heater 18 and the processing tank 10 to dry the clothes 2.

The solvent gas evaporated from the clothing 2 is condensed in the air cooler 17 and passed through the recovery path 21 to the water separator 2.
2. Collect into the clean tank 24 via the solvent pipe 23.

(7) When drying is completed, the dampers 25 and 26 are opened 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. do.

(8) The solvent 4 that entered the distiller 15 in the step (2) is evaporated, condensed and recovered in the condenser 27, and the solvent passes through the water separator 22, solvent piping 23, clean tank 24, and overflow partition plate 28. Collect into tank 3.

Note that the water separated by the water separator 22 is transferred to the water pipe 29.
It is discharged out of the system by

The solvent stains that wash clothes in this way can be broadly divided into solid stains and solvent stains.The former includes dirt, human hair, lint, etc., and the latter includes general oil stains, sweat, dye removal, etc. The degree of solvent staining is determined by the content of the former stain, but in ordinary dry cleaning machines, solvent staining depends on the amount of stains discharged from clothing and the amount of distillation.

However, with conventional cleaning machines,
A certain amount of solvent is always distilled, ignoring the amount of dirt on clothing that has a large effect on the solvent. In some cases, too much dirt accumulates in the solvent, reducing the cleaning power. Otherwise, dirt that has once transferred to the solvent side may be reattached (adsorbed) to the clothing, resulting in reverse contamination (graying).On the other hand, when the clothing is lightly soiled, it may be necessary to distill more solvent than necessary. This results in wasted energy, cooling water, detergent, etc.

The present invention was proposed in view of these circumstances, and aims to provide a solvent recovery control device for dry cleaning machines that saves energy and eliminates wasted use of cooling water, solvent, etc. A circulation circuit in which the organic solvent in the medium treatment tank is guided through a pump to a filter, where the solvent is passed through, and then returned to the treatment tank, and the spent organic solvent from the treatment tank is guided into the distiller by the pump, where the solvent is removed. a first solvent recovery circuit that distills and recovers the solvent and guides the recovered solvent to a clean tank; and a first solvent recovery circuit that is connected to the clean tank via an overflow partition plate, supplies the stored solvent to the pump, and receives the solvent from the processing tank. The fans, air coolers, and air heaters installed in the solvent tank that can be used for cleaning, and the recovery duct connected to the treatment tank are operated to condense and recover the solvent from the solvent gas generated from the treatment tank, and the recovered solvent is transferred to the above-mentioned cleaner. In a large dry cleaning machine equipped with a second solvent recovery circuit leading to a tank, the solvent flow path or the storage tank is attached to the tank and a part thereof is formed of a transparent member, and light is projected onto the member near the transparent member. a contamination degree detector consisting of a light projector that allows an optical path to pass through the solvent, and a light receiver that receives the light path from the projector and continuously detects the degree of contamination of the solvent in real time based on the amount of received light; Based on the detection results, the valves installed in the solvent flow path are continuously switched and adjusted in real time to control the amount of organic solvent discharged from the treatment tank that is supplied to the distiller and the amount that is returned to the solvent tank. It is characterized by comprising a distillation amount solvent control device.

An embodiment of a solvent stain level detecting device in which the present invention is applied to the dry cleaning machine shown in FIG. 1 will be described with reference to the drawings. FIG. 2 is a partial vertical sectional view thereof.

In the above diagram, a is a solvent pipe constituting part of the cleaning circuit shown in FIG. 1, its bypass circuit, or a solvent tank, b is a cylindrical transparent chamber inserted into pipe a and made of a transparent member such as glass, and f is and e are a light projector and a light receiver respectively attached to opposite sides of transparent chamber b, and d is a cap nut for airtightly fixing the upper and lower ends of transparent chamber b to solvent pipe a through gasket c.

In such a device, the amount of light emitted from the projector f and the amount of light entering the receiver e changes depending on the degree of contamination of the solvent flowing into the transparent chamber b.

A photoelectric element is generally used in the light receiver e, and the solvent stain is converted into voltage by extracting a DC analog voltage signal proportional to the amount of light via an amplifier.

In addition, the floodlight f is a tungsten lamp,
In the light receiver e, such as various light emitting diodes, a light receiving element (such as a CDS element) ranging from infrared to visible range is generally used, and alternating current lighting is also effective as a countermeasure against drift in light emitting diodes.

The DC analog voltage output from the photoreceiver is used as shown below depending on the necessity.

(1) Set a reference voltage corresponding to reference contamination, and if the output voltage falls below the reference voltage, issue an alarm or perform a specified amount of distillation.

(2) The amount of distillation is determined by defining the solvent contamination in stages, setting the voltage corresponding to each stage, and determining which stage the output falls into.

(3) Continuously control the distillation amount via valve 5 and/or valve 14 in proportion to the DC analog voltage corresponding to solvent contamination (proportional control).

By applying (1) to (3) above, it is possible to control the amount of distillation depending on the degree of solvent contamination, thereby preventing wasted distillation energy, increasing cleaning power, and reducing back contamination. In particular, large quantities of dry cleaning can be carried out economically at high operating rates.

(4) Furthermore, if necessary, part of the solvent in the solvent tank is supplied to the treatment tank via a pump, and a part of the solvent in the treatment tank is supplied to the distiller via a pump. The degree of contamination of the solvent in the solvent tank and, in turn, the solvent in the processing tank can be automatically maintained within a set value.

At this time, if the transparent chamber b becomes dirty, it can be easily cleaned by removing the cap nut d.

In the above embodiment, a transmission type received light amount detector is used, but a reflection type one in which a light emitter and a light receiver are housed in a common block may also be used.

In short, according to the present invention, the organic solvent in the treatment tank during the cleaning process is introduced into the filter through a pump, the solvent is passed through, and the spent organic solvent is returned to the treatment tank again. a first solvent recovery circuit that is guided to the distiller by the pump, distills and recovers the solvent, and guides the recovered solvent to a clean tank; and a first solvent recovery circuit that is connected to the clean tank via an overflow partition plate and supplies the stored solvent to the pump;
In addition, the solvent tank that can receive the solvent from the processing tank and the fan, air cooler, and air heater installed in the recovery duct connected to the processing tank are activated to condense the solvent from the solvent gas generated from the processing tank. A large dry cleaning machine is equipped with a second solvent recovery circuit that collects the recovered solvent and guides the recovered solvent to the clean tank. Contamination consisting of a light projector that projects light onto the member near the member and passes the light path into the solvent, and a light receiver that receives the light path from the projector and continuously detects the degree of contamination of the solvent in real time based on the amount of light received. Based on the detection results of the temperature detector and the light receiver, the valves installed in the solvent flow path are continuously switched and adjusted in real time, and the amount of organic solvent discharged from the treatment tank is supplied to the distiller, as well as the amount of solvent By including a distillation amount solvent control device that controls the amount returned to the tank, an economical dry cleaning solvent recovery control device that saves energy and eliminates wasted use of cooling water, solvent, etc. is obtained. ,
The present invention is extremely useful industrially.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing a known dry cleaning machine, and FIG. 2 is a partial vertical cross-sectional view showing a solvent stain level detection device according to an embodiment of the present invention. a... Solvent pipe line, b... Transparent chamber, c...
Gasket, d... Cap nut, e... Receiver, f
...Floodlight.

Claims (1)

[Scope of utility model registration request] During the cleaning process, the organic solvent in the treatment tank is guided to a filter via a pump, and the solvent is passed through, and then returned to the treatment tank again. The spent organic solvent from the treatment tank is guided to the distiller by the pump. a first solvent recovery circuit that distills and recovers the solvent and leads the recovered solvent to a clean tank; and a first solvent recovery circuit that is connected to the clean tank via an overflow partition plate, supplies the stored solvent to the pump, and supplies the solvent in the processing tank. The fans, air coolers, and air heaters installed in the solvent tank that can receive the solvent and the recovery duct connected to the processing tank are operated to condense and recover the solvent from the solvent gas generated from the processing tank, and the recovered solvent is recovered. The second one leads to the above clean tank.
In a large dry cleaning machine equipped with a solvent recovery circuit, a part of the solvent recovery circuit is attached to the solvent flow path or storage tank and is made of a transparent member, and light is projected onto the member near the transparent member to form an optical path into the solvent. a contamination degree detector consisting of a light emitter that transmits the light, and a light receiver that receives the light path from the light emitter and continuously detects the degree of contamination of the solvent in real time based on the amount of received light; A distillation amount solvent control device that continuously switches and adjusts a valve provided in a solvent flow path in real time to control the amount of organic solvent discharged from the treatment tank supplied to the distiller and the amount returned to the solvent tank. A solvent recovery control device for a large dry cleaning machine, characterized by comprising: