JPH03123589A - Drying air volume-adjusting method for dry cleaning - Google Patents

Abstract

PURPOSE:To reduce the cost of a drying process, by a method wherein in process of a drying process of dry cleaning, a drying fan-motor is normally rotated is the first half process and is reversely rotated in the second half, so that air volume is varied. CONSTITUTION:A plurality of blades 53 are located radially in centering around a connected part and on a concentric circle. Each of the blades 53 has a specified radius of curvature and the center of the radius exists in the same direction against the rotation of an impeller 51. In process of a drying process of dry cleaning, a fan is normally rotated in the direction of an arrow mark 'a' in the early stage of drying and after that, it is reversely rotated in the direction of an arrow mark 'b'. In the early stage thereof, a large amount of air is circulated between an air duct 19 for recovery and a processing receptacle 10, and a large amount of energy is applied to clothes. In the late stage thereof, the amount of the air is made smaller to the level of 1/2 to 3/4 as compared with that of the early stage thereof and is also circulated, so that an effect of deep cooling is heightened. In this way, the recovery ratio of a solvent in the late stage is raised using the same refrigerating machine.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a drying air volume adjustment method that realizes cost reduction of the drying process in a dry cleaner.

(Prior Art) First, a dry cleaning process using perchlorethylene as a solvent will be outlined with reference to FIG. 4.

When the clothing 2 is put in through the door 1, the door 1 is closed, and the operation is started, the steps generally proceed in the following order.

(2) Pump up the solvent 4 from the solvent tank 3 via the valve 5 with the pump 6, and send the necessary amount of the solvent 4 into the processing tank IO through the path consisting of the valve 7 and the filter 8 or the path consisting of the valve 9.

■, Slowly rotate the processing drum 11 and pour the solvent 4 into the processing tank 1.
0, a circuit consisting of a button trap 12, a valve 13, a pump 6, a valve 7, a filter 8, or a valve 9
The clothes 2 are washed by circulating through a circuit consisting of the following.

(2) The liquid is drained through the processing tank 10, button trap 12, valve 13, pump 6, valve 14, and distiller 15, and then the processing drum 11 rotates at high speed to centrifugally separate the solvent 4 in the clothing 2. Drain in the same way.

■Repeat the steps of ■ and ■ above.

(2) The liquid is drained into the solvent tank 3 through the path of the processing tank 10, button trap 12, valve 13, and valve 5, and then the processing drum 11 rotates at high speed to centrifugally separate the solvent 4 in the clothing 2 and drain it.

■Slowly rotate the processing drum 11 again, and the fan 16,
Air is circulated in the direction of arrow 20 between a recovery air duct 19 consisting of an air cooler 17 and an air heater 18 and a processing tank IO to dry the clothes 2. 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 Tallinn tank 24 through the solvent pipe 23.

② 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 the damper 2
The uncondensed solvent gas that cannot be recovered by the air cooler 17 is exhausted from the air cooler 17, and the solvent odor in the clothing 2 is deodorized.

The solvent 4 that entered the distiller 15 in the step ① and above ② is evaporated, condensed and recovered in the condenser 27, passes through the water separator 22 and the solvent pipe 23, enters the clean tank 24, and then flows through the partition plate 28 with an overflow. Return to solvent tank 3. The water separated by the water separator 22 is discharged to the outside of the system through a water pipe 29.

In addition, 30 in FIG. 4 is a water stem air pipe, which is connected to the air heater 18 and heats the air that has passed through the air cooler 17 (for example, the temperature of the air is about 35° at the inlet of the air heater I8).
C, the temperature at the outlet of the air heater 18 is approximately 90'C. ), and 31 is a cooling water pipe that condenses and liquefies the solvent gas (evaporation temperature, e.g. 121°C) evaporated in the distiller 15 (
The temperature at the outlet of the condenser 27 is approximately 40'C). Also 32
is a steam pipe which heats and distills the solvent drained into the distiller 15.

(Problem to be Solved by the Invention) In the drying step (2) described above, normally, air is circulated between the recovery air duct 19 and the processing tank 10 by rotating a fan inflator directly connected to one fan motor, and the air cooler 17 The air other than the condensed and liquefied solvent is passed through an air heater 18 to become hot air, and this is sprayed onto clothing to evaporate the solvent adhering to the clothing. The evaporated solvent is air cooler 17
It is passed through, condensed and liquefied and recovered.

Here, the air cooler 17 normally performs water cooling, but in order to further increase the recovery efficiency, it is possible to improve the solvent recovery efficiency by using an evaporator of the refrigerator and cooling the steam circulating air. I understand. By the way, recently, when outside air is taken in to deodorize in the above-mentioned step (2) after drying, it costs money to deal with the problems that arise due to the exhaust, so some people are considering omitting this step. Became. However, simply omitting deodorization leaves a large residual odor in the clothing, so the air cooler 17 is changed from water cooling to cooling using a refrigerator during the drying process, and furthermore, deep cooling is performed at the end of the drying stage to improve the solvent recovery rate. It becomes necessary to take measures to reduce residual odor.

There are various ways to achieve deeper cooling using the same refrigerator, but reducing the amount of circulating air reduces the load on the air cooler and increases the deep cooling effect. Therefore, it is usually considered to apply a large amount of energy to the clothes with a large air volume in the early stage of drying, and to increase the solvent recovery rate with a small air volume in the final stage of drying. Moreover, the requirement for such air volume switching is that it is inexpensive.

As mentioned above, a fan used for drying a dry cleaner generally has a structure in which a motor and a fan inflator are directly connected. Therefore, in order to change the air volume of the fan, it is necessary to be able to directly change the motor rotation speed, so for example, a ball change motor is used to
A combination of 2P and high speed rotation at the beginning of drying, and 4P at the end of drying.
Usually, this is done by rotating at a low speed or by using an inverter (frequency conversion), but the disadvantage of both methods is that they are expensive.

Therefore, an object of the present invention is to provide a drying air volume adjustment method that allows for inexpensive switching of air volume and efficient solvent recovery while taking into account the load fluctuations of the refrigerator.

(Means for Solving the Problems) That is, the inventor of the present invention conducted extensive research to see if there was a method for easily changing the air volume using an inexpensive general-purpose motor without using the pole change motor or inverter. This focuses on the shape of the fan itself. Fan blades have directionality, and since all of the blades face in a certain direction, it is possible to change the air volume by simply reversing the rotation, even using an inexpensive general-purpose motor. confirmed.

Note that the same applies to the ball change example described above, but the range of change in air volume is A-
It is common to set it to about % in consideration of load fluctuations of the refrigerator.

From this point of view as well, it was confirmed that the above method was sufficient to satisfy this value.

That is, in order to achieve the above object, the present invention is a drying process of a dry cleaner, in which a large air volume is used in the first half to effectively evaporate the solvent from clothing, and a dry cleaner is used in the second half to effectively evaporate the solvent from clothing with a large air volume, and in the latter half, a dry cleaner is used to process the drying process with a low air volume with the main focus on cooling recovery. The gist of the cleaner is to rotate the drying fan motor in the normal direction in the first half, and to change the air volume by rotating it in the reverse direction in the second half.

(Function) As is generally known, the electrical circuit for reversing the motor can be constructed by constructing an electrical circuit for switching the R, S, and T phases of a three-phase power supply, and the cost will depend on the motor capacity. ,
Since the cost increase corresponding to the cost of the motor when changing from a general-purpose motor to a ball change motor can be omitted, it becomes very inexpensive. As a result of experiments, when the fan impeller shown in Figure 1 is rotated forward and reverse in the drying system of a dry cleaner, the air volume is approximately 4.7 J/min during normal rotation, and 2.7 f/min when reversed. It was possible to change the structure to suit its purpose.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially cutaway view showing an example of a fan impeller used in carrying out the present invention, and FIG. 2 is a sectional view taken along line A-A in the same figure.

Moreover, FIG. 3 is a front view showing an example of the same fan casing.

In these figures, 51 is a fan impeller, 52 is a fan casing, 53 is a blade, 54.55 is a side plate, and 56
is the connection part with the motor shaft.

It is important that the blades 53 constituting the fan impeller 51 used in the present invention have directionality, and the illustrated example is a so-called forward-facing blade.
are arranged radially from the center of the connection part and on concentric circles,
Each section 153 has a predetermined radius of curvature R, and its center lies in the same rotation direction of the impeller 51. In FIGS. 1 and 3, arrows a and b indicate the direction of rotation, with a indicating normal rotation and b indicating reverse rotation.

The capacity of the fan does not only depend on the shape of the fan impeller 51, but is also influenced by the shape of its casing 52. That is, the performance of the fan is determined by various factors such as the compatibility of the fan impeller 51 with the fan casing 52, the width of the fan impeller 51, and the shape of the Polute curve of the fan casing 52. However, in the present invention, the important points are as follows. The problem is not the capacity of the fan, but the fact that the blades 53 forming the fan impeller 51 have directionality as described above.

In this example, a fan as shown in the figure is used, and in the drying step (2) of the dry cleaning process described above,
At the beginning of drying, the fan is rotated forward in the direction of arrow a, and then reversed in the direction of arrow A. At the beginning of drying, a large amount of air is circulated between the recovery air duct 19 and the processing tank 10, thereby transferring a large amount of energy to the clothes. At the end of drying, the air volume is reduced to about 'A-'A' compared to the beginning of drying, and the same circulation is performed to increase the deep cooling effect, and the same refrigerator is used to increase the solvent recovery rate at the end of drying. raise.

Incidentally, in the case of this example, the initial air volume was 4°7 J/min, while the final air volume was 2.7+l/min, and the initial objective was fully achieved.

Note that with other conditions being the same, the fan impeller 51 is
If you want to reduce the change in air volume due to reverse rotation, set blade 5.
The radius of curvature R of No. 3 may be set large. Of course, the opposite is also true.

(Effects of the Invention) As described above in detail, according to the present invention, a general-purpose motor is used as a fan drive motor in the drying process of dry cleaning, and the air volume can be adjusted by simply switching the motor from forward rotation to reverse rotation. It becomes possible to change it within an appropriate range, and it becomes possible to have a cheaper system configuration.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view showing a single example of a fan impeller used in carrying out the present invention, Fig. 2 is a sectional view taken along line A-A in the same figure, and Fig. 3 is an example of a fan casing used in the present invention. FIG. 4 is a conceptual diagram showing a conventional dry cleaner. Explanation of main parts of the diagram 51 - Fan inflator 52 - Fan casing 53 - Vane jP 51 Figure 3 Figure 2

Claims (1)

[Claims] In the drying process of a dry cleaner, the first half uses a large air volume to effectively evaporate the solvent from clothing, and the second half uses a low air volume to focus on cooling recovery.In the first half, the drying fan motor rotates in the normal direction. This dry air volume adjustment method for a dry cleaner is characterized in that the air volume is changed by reversing the air volume in the second half.