JPS60236695A - Drycleaner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a dry cleaner that performs cleaning using a chlorine-based solvent, such as perchlorethylene or trichloroethane.

(1=I) Conventional technology This type of dry cleaner reuses expensive solvents to reduce costs (the used solvent is distilled and the water that is mixed in is separated by a water separator based on the difference in specific gravity). Then, drain it and collect the solvent. The following is a description of a conventional general dry cleaner equipped with a collection means that refuses to be collected.
This will be explained based on FIG. 1, FIG. 2, and FIG. 3, citing Publication No. 0.

(1) is the washing tub, (2) is the solvent tank, and (3) is the liquid supply pump. When washing starts, the solvent in the solvent tank (2) is
The one-way valve (4) and the solenoid valve (5) are operated by the liquid supply pump (3).
) can be supplied to washing machine N(1). (6) is a drain pump, which circulates the solvent in the washing tub (1) through the one-way valve (7) and the solenoid valve (5) during washing operation. (8> is a distiller, which is divided into a distillation chamber (lO) and a heating chamber (11) by a partition plate (9),
An electric heater (12) is installed in the second heating chamber. (13) is a pressure switch for detecting the pressure inside the heating chamber (11). When using this distiller (8), water is put into the heating chamber (11), and steam is generated by heating this water with the electric heater (12),
This steam passes through the partition plate (9) into the distillation chamber (1).
0) is heated and distilled.

(14) is a drying ventilation passage whose both ends communicate with the laundry room (1), and inside the ventilation passage there is a filter (15), a float switch (16), a blower (17), a condenser (18), a heating During the above-mentioned washing operation, the solvent enters the drying ventilation passage (14) up to the position of the float switch (16), and the broad switch (16) The solvent level in the washing tub (1) is controlled.The heater (19) has a normal radiator structure in which a number of plate-shaped heat dissipating fins are fitted into a meandering heat medium passage (19'). The heating medium passage (19'
) is connected to the distiller (8) through the valve (2o), and the other end is connected to the water separator (21), which in turn is connected to the solvent tank (21). On the other hand, one end of the refrigerant passage (18') of the condenser (18) is connected to the outflow side (A) of the water separator (21), and the other end is connected to the cooling coil (A) in the water separator (21). 22> and is connected to the water teller inlet side (B) through a cooling coil (23) in the solvent tank (2).

(24) is a solvent recovery pipe for recovering the solvent condensed in the condenser (18), and the recovered liquid collection tank (25)
Once collected, the water is sent to the water separator (21) via a solenoid valve (26). (27) (2g) are an intake valve and an exhaust valve, respectively. During the drying process, they are located at the position indicated by the broken line in the figure, and the intake port (29) and exhaust port (3
0), and during the deodorizing process after the drying process, the position is switched to the solid line position in the figure to block the drying ventilation path (14) and at the same time open the intake port (29) and the exhaust port (30). '(:i'l) is a motor that drives the air blower 4m (17).

In the above configuration, when the washing process and the deliquing process are completed, the solvent is distilled at the same time as the drying process begins. That is, when the washing process is completed, the drain pump (6) rotates, and the solvent in the washing tank (1 tank) enters the distillation chamber (10) through the electromagnetic valve (32). When the drying stage begins after the liquid stage is over, the distiller's electricity is turned on (12
) is turned off and steam is generated in the heating chamber (11). Therefore, the solvent that has entered the distillation chamber (10) is heated by the vapor and evaporates, passing through the valve (20) to the °C heater (19).
flows into. On the other hand, at this time, the blower (17) is rotating and cold water is flowing from the water chiller to the condenser (18).

Therefore, the air drawn into the drying ventilation passage (14) from the washing tub (18) by the air blower @ (17) is transferred to the condenser (18).
), the condensed solvent is collected in the collected liquid collection jTII (25), and when the solenoid valve (26> is opened after the drying process is completed, it is transferred to the water separator ( The air that has passed through the condenser (18) passes through the heater (19).The heating medium passage of this heater (19) (
The heater (19) is at a high temperature because the high temperature solvent vapor evaporated from the distiller (8) is flowing through the heater (19') as described above. Therefore, the above air is supplied to this heater (1
9), it is heated and turned into hot air, which evaporates the solvent from the clothes in the FC washing tub (,1,) and dries the clothes. On the other hand, the solvent vapor flowing through the heating medium path (19') of the heater (19')
The water is condensed by dissipating heat in step 9), and further flows into the water separator (21). The solvent that has entered the water separator (21) is further cooled by the coil (22), and after water is separated, it is collected in the solvent tank (2). This drying process continues until the distillation is complete. That is, when step i is completed and the solvent in the distillation chamber (10) is exhausted, the pressure in the heating chamber (11>) increases rapidly, which is detected by the pressure switch (13>) and the drying process is completed.

When drying is completed in this way, a deodorizing process begins. In the deodorizing process, the intake valve (27) and exhaust valve (28> are switched to the solid line position in the figure to open the intake port (29) and exhaust port (30),
Fresh air is taken into the washing tub (1) through the intake port (29) and is further discharged through the exhaust port (<30). As a result, the solvent vapor that had filled the washing tub (1) even after the drying process is discharged from the exhaust port (30>).

Here, the water separator (21) is as shown in FIG.
There is a solvent storage chamber divided by a partition plate (33 mm) inside the container.
34) and a separation chamber (35), and both chambers (34) (35) are formed.
) are communicated at the lower part of the partition plate (33). An introduction pipe (36) that communicates with the heater (19) and the solenoid valve (26) can be inserted into the upper part of the container, and a recovery pipe (36) that communicates with the solvent tank (2) is installed in the upper part of the solvent storage chamber (34). 37〉 is fully inserted,
A separated water discharge pipe (38) is inserted into the upper part of the separation chamber 35). (39) is the ventilation passage (14) that dries the odor inside the vessel.
〉It is a discharge tube that discharges into the inside. And a water separator with (
21) introduces a distilled solvent or a solvent condensed by a condenser (18), cools it, and separates water according to its specific gravity in a separation chamber (35). Solvents with high specific gravity! Water with a low specific gravity forms an aqueous layer in the upper part of the separation chamber (35) and is sequentially discharged.

However, as is clear from the characteristic diagrams in FIGS. 4(a) and 4(b), since the solvent is dissolved in water, the discharged water contains the solvent. Furthermore, unless the solvent condenses into large droplets, it cannot be completely separated by the difference in specific gravity alone, and is dispersed in the water layer in the form of a fine colloid, increasing the solvent content in the discharged water to a level higher than its solubility. Furthermore, if the solvent does not form into large droplets, the difference in surface tension acts more strongly than the difference in specific gravity, causing the solvent to stop on the surface of the water layer and exit from the discharge pipe (38) as it is. In this way, the discharged water can be mixed into underground water, etc., but since chlorinated solvents are carcinogenic substances, there has been a desire to completely recover the solvents in the discharged water.

(c) Purpose of the Invention The present invention aims to separate and remove the solvent from the separated and discharged water as much as possible.

(2) Structure of the Invention The present invention is a dry cleaner characterized in that a solvent is adsorbed and separated from water separated by a difference in specific gravity in a water separator using an adsorbent such as activated carbon. If a solvent is contained in the above water, it cannot be separated due to the difference in specific gravity, but the solvent is adsorbed and removed from the separated water, reducing the concentration of solvent in the wastewater to zero or significantly, and helping prevent contamination of groundwater, etc. by the wastewater. It is something.

(e) Embodiment The separation means of the present invention will be explained based on FIG. 1, but since the solvent circuit as a dry cleaner is the same as a conventional one, FIG. 2 will be referred to.

(40) is a cylindrical water separator with a bottom, the lower side wall is connected to a recovery pipe <41) which communicates with the solvent tank (2) via a bent path, and the upper side wall is used to collect distilled solvent, etc. to be separated. Introductory tube (
42) are connected and communicated with each other, and a primary discharge pipe (43) for separated water is inserted into the center of the bottom, which extends from the outside to the upper part of the inside. (44) is a lid body that seals the upper opening of the water separator (40), and a downward-facing cylinder (45) is vertically placed deeply so as to surround the secondary discharge pipe (43). Release tube (4
6) are connected and communicated. 47) is the drying ventilation passage (1
4), through which the upper part of the curved surface of the recovery pipe (41) and the discharge pipe (46) communicate.

(48) is a cylindrical solvent iron applicator with a bottom, and a lattice-like or porous mounting shelf (49) is arranged in the F part of the vessel, and a solvent adsorbent is placed on this shelf (49). Store and prepare activated carbon (50°C). The adsorber (48) connects and communicates with the secondary discharge pipe (43) at the bottom, and connects and communicates with the secondary discharge pipe (51) leading to the sewer on the positive side wall. In addition, (52) is a drain valve, and (53) is a lid body.

Here, the water separator (40) and the solvent adsorber (48) are connected by crosspieces (54) (54), and their height positions are fixed. And the inner device (40) (48>
A head difference is created between them so that separated water automatically flows from the water separator (40) to the solvent adsorber (48).

To explain the separation operation, the solvent and water introduced from the introduction pipe (42) into the water separator (40) are cooled by a cooler (not shown) inside the vessel, and due to the difference in specific gravity, a solvent layer is formed at the bottom. , respectively forming a water layer on top. The solvent in the lower part is led out from the recovery pipe (41) and discharged from the upper part of the water bottle secondary discharge pipe (43).

At this time, s<45) constitutes a partition wall that prevents the introduced solvent and water from mixing with the discharged water.

Separated water is separated based on the difference in specific gravity, and the separated water is separated using a solvent adsorber (48 ml).
, □1 automatically flows in from the bottom depending on the water head difference, and activated carbon
)”, the solvent layer is adsorbed there,
It is discharged from the secondary IJ outlet pipe (51). Therefore, the solvent concentration in the discharged water is zero or extremely small.

The solvent vapor and odor coming out of the communication pipe (47) reach the drying ventilation passage (14) in the solvent circuit, where they are transferred to the condenser (18).
) and flows into the zero recovery liquid collection tank (25), from where it is introduced into the water separator (40) again via the introduction pipe (42), and the above-described separation operation is repeated.

Incidentally, the activated carbon (50) is packed in a bag in advance and is replaced from time to time, and the adsorbed solvent is recovered by appropriate means.

(F) Effects of the Invention According to the present invention, since the solvent that cannot be separated based on the difference in specific gravity is secondarily separated using an adsorbent, the concentration of the solvent in the discharged water can be reduced to zero or significantly, thereby preventing contamination of external groundwater, etc. It is possible to provide a high-performance dry cleaner that prevents this from occurring.

[Brief explanation of the drawing]

Fig. 1 is a sectional mechanical diagram showing the separating means of a dry cleaner according to the present invention, Fig. 2 is a solvent circuit diagram of a conventional dry cleaner, Fig. 3 is a sectional view of the conventional separating means, and Fig. 4 (A). 〉 is a characteristic diagram showing the solubility of water and solvent. (40>・Water separator, (48>・Solvent adsorption device, (5
0)...Activated carbon. Applicant Sanyo Electric Co., Ltd. Agent Patent Attorney Shizuo Sano Figure 1 Figure 2 =] Figure 3 9 (%V peak da 9! thing 1) 1 hook □

Claims (1)

[Claims] (1) In dry cleaners that recover chlorinated solvents used for cleaning by steaming, a water separator k separates the water in the distilled solvent based on the difference in specific gravity, and a water separator k separates the water from the separated water using activated carbon, etc. A dry cleaner characterized by comprising a solvent adsorber that separates using an adsorbent.