JPH0222680B2 - - Google Patents

Description

Detailed Description of the Invention The present invention relates to perchlorethylene, 1,1,1-trichloroethane, 1,1,2-trichloro-1,
This invention relates to dry cleaning equipment that uses organic solvents such as 2,2-trifluoroethane R113 and trichloromonofluoromethane R11, and in particular to a method and device for preventing a rise in solvent temperature in a dry cleaning equipment that aims to prevent a rise in solvent temperature. .

A conventional dry cleaning apparatus is schematically shown in FIG. 1, and the conventional dry cleaning process will be explained using FIG. 1 (hereinafter, perchlorethylene will be explained as an example). First, put clothing 2 into door 1, close door 1, and 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,
The clothes 2 are washed by circulating through a pump 6 and a circuit consisting of a valve 7 and a filter 8 or a circuit consisting of a valve 9.

Processing tank 10, 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 drain it in the same way.

Repeat the steps above.

Processing tank 10, 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.

The processing drum 11 is slowly rotated again, 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, and the clothes 2 are dried. The solvent gas evaporated from the clothing 2 is condensed in the air cooler 17, enters the water separator 22 through the recovery path 21, and enters the clean tank 24 through the solvent pipe 23.

When the drying is completed, the dampers 25 and 26 open as shown by the broken line, 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.

One cycle of the above steps is divided as shown in FIG.

In FIG. 1, 30 is a steam pipe connected to the air heater 18 to heat the air that has passed through the air cooler 17, 31 is a cooling water pipe that condenses and liquefies the solvent gas evaporated in the distiller 15, and 32 is a water vapor pipe connected to the distiller 15. Steam piping for heating and distilling the drained solvent, 33
34 is a cooling water pipe, and 34 is a water control valve that detects the cooling water outlet temperature and supplies the necessary cooling water to the drying process.
35 indicates a steam valve.

Now, the solvent 4 that entered the distiller 15 in the above step
is evaporated, condensed and recovered in the condenser 27, enters the clean tank 24 through the water separator 22 and solvent piping 23, and returns to the solvent tank 3 through the overflow partition plate 28. Further, the water separated by the water separator 22 is discharged to the outside of the system through a water pipe 29.

However, when the liquid temperature of perchlorethylene rises in the cycle shown in Fig. 2 in the apparatus shown in Fig. 1,
Negative effects on clothing, such as shrinkage and discoloration, increase. In addition, the following three points can be considered as factors for increasing the solvent temperature in this case.

(a) The temperature of the solvent in the distilled recovered liquid increases due to the capacity of the condenser 27, lack of cooling water, etc.

(b) Drying temperature in the drying process (55℃~60℃)
, the temperature of the processing tank 10, processing drum 11, etc. is raised, but the sensible heat of this device cannot be dissipated during one cycle, and the cleaning liquid is heated to the processing tank 1 in the next cycle.
0, the temperature of the cleaning liquid is raised by the sensible heat. By repeating this process, the solvent temperature will gradually rise.

(c) The temperature of the solvent increases due to liquid circulation by the pump 6.

Now, among the factors (a) to (c) above, (a) can be dealt with by selecting an appropriate capacitor and increasing the amount of cooling water, and (c) can be ignored because the increase is small, whereas ( b) is the biggest cause of the increase in solvent temperature, but there is no simple method to deal with it.

The present invention aims to prevent the increase in solvent temperature and eliminate the above-mentioned conventional problems such as clothing accidents.The present invention is a dry cleaning device having a loop from the processing drum to the processing drum via a fan, an air cooler, and an air heater. In the drying process, a small flow control valve installed on the cooling pipe that flows cooling water to the air cooler is operated to condense and recover the solvent gas, and in the next cooling process, the heat source of the air heater is shut off and the cooling water is When a high-flow bypass valve with a larger diameter than the water control valve is operated, it is installed on a bypass pipe that branches from the inlet side of the water control valve and merges with the outlet side of the water control valve. It is an object of the present invention to provide a method for preventing an increase in solvent temperature in a dry cleaning apparatus, which prevents an increase in solvent temperature by circulating a flow through the loop.

The present invention also provides a dry cleaning device that circulates air between a recovery air duct consisting of a fan, an air cooler, and an air heater, and a processing drum, in which a water control valve for the drying process is provided on a cooling water pipe that flows cooling water to the air cooler. , a bypass pipe is installed in parallel with the cooling water pipe that branches from the inlet side of the water control valve in the cooling water pipe and joins to the outlet side of the water control valve, and a bypass pipe larger than the water control valve is installed on the bypass pipe. It is an object of the present invention to provide a device for preventing a rise in solvent temperature in a dry cleaning apparatus equipped with a bypass valve for a cooling process.

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an embodiment of the apparatus of the present invention, and shows an improved structure of the main parts in FIG. 1. To explain only the differences between FIG. 4 and FIG. 1, reference numeral 33 is a cooling water pipe that flows cooling water to the air cooler 17. A water control valve 34 for the drying process is provided on the pipe 33, and a water control valve 34 for the drying process is provided on the pipe 33. A bypass pipe that branches from the inlet side of the water control valve 34 in the water pipe 33 and merges with the outlet side of the water control valve 34 is provided in parallel with the cooling water pipe 33, and the water control valve 34 is installed on the bypass pipe. An automatic opening/closing valve (bypass valve) 36 is provided which is opened only during the cooling process with a large diameter compared to the above.

Next, to explain the differences between the method of the present invention and the conventional method, the steps from the pre-washing step to the drying step are the same, so their explanation will be omitted here.
Only the steps in FIG. 3 showing an embodiment of the present invention will be explained.

Cooling process When the drying process is finished, the steam valve 35 of the steam pipe 30, which is the heat source of the air heater 18, is closed.
By opening the automatic opening/closing valve 36, a large flow of cooling water is passed through the air cooler 17, and the air flow is circulated from the fan 16 → air cooler 17 → air heater 18 → processing drum 11 (clothing 2) → fan 16. Sensible heat from devices such as the tank 10 and the processing drum 11 is removed, and the clothing 2 is also cooled.

Deodorizing process This is the same as the deodorizing process shown in FIG. 2, but since the clothing 2 has already been cooled in the cooling process, the time can be shorter than that of the deodorizing process shown in FIG. The present invention is constructed as described in detail above, and by providing a cooling process between the drying process and the deodorizing process, the sensible heat of the device is reduced by 5 degrees Celsius above the cooling water temperature (the air cooler outlet water temperature is usually about 30 degrees Celsius). It is possible to lower the temperature to about 10°C, preventing the solvent temperature from rising and eliminating clothing accidents such as shrinkage and discoloration of clothing. In addition, since the clothing itself can be sufficiently cooled, the occurrence of wrinkles in the clothing can be reduced and the finishing process can be made easier.

In addition, the present invention provides a bypass pipe in parallel with the cooling water pipe of the air cooler, a water control valve for the drying process on the cooling water pipe, and a water control valve for the cooling process with a larger diameter than the water control valve on the bypass pipe. Since the bypass valve is provided, it is possible to sufficiently reduce the sensible heat of the device to the desired temperature in the cooling process. Moreover, since the present invention has an extremely simple structure in which bypass piping having a bypass valve is simply installed in parallel to the conventional device, it is possible to achieve the objective without significantly increasing the cost of the device. It is.

[Brief explanation of drawings]

FIG. 1 is a front sectional view of a conventional general dry cleaning apparatus, FIG. 2 is an explanatory diagram showing a conventional dry cleaning process, and FIG. 3 is an explanatory diagram of a dry cleaning process showing an embodiment of the present invention. FIG. 4 shows an embodiment of the device of the present invention, and is a front sectional view showing an improved structure of the main part of FIG. 1. Explanation of the main parts of the diagram, 2...Clothing, 11...Processing drum, 16...Fan, 17...Air cooler, 18...Air heater, 33...Cooling water piping,
34... Water control valve, 36... Automatic opening/closing valve (bypass valve).

Claims (1)

[Scope of Claims] 1. In a method for preventing a rise in solvent temperature in a dry cleaning apparatus having a loop returning from a processing drum to the processing drum via a fan, an air cooler, and an air heater, in the drying process, a method for preventing a rise in solvent temperature on a cooling pipe that flows cooling water to the air cooler is provided. After condensing and recovering the solvent gas by activating the small flow water control valve installed at A high-flow bypass valve with a larger diameter than the water control valve is installed on the bypass piping that joins the outlet side of the water valve, and the air flow is circulated through the loop to prevent a rise in solvent temperature. A method for preventing a rise in solvent temperature in dry cleaning equipment. 2. In a dry cleaning device that circulates air between a recovery air duct consisting of a fan, an air cooler, and an air heater, and a processing drum, a water control valve for the drying process is provided on the cooling water pipe that flows cooling water to the air cooler, and A bypass pipe that branches from the inlet side of the water control valve in the water pipe and merges with the outlet side of the water control valve is provided in parallel with the cooling water pipe, and a cooling pipe with a diameter larger than that of the water control valve is installed on the bypass pipe. A solvent temperature rise prevention device for dry cleaning equipment, characterized by being equipped with a process bypass valve.