JPH05212188A - Control device of drum type washing machine - Google Patents

Abstract

PURPOSE:To prevent a liquid stagnating in an outer trough from being carried up together by the peripheral wall of a drum at the liquid removing stage and enhance the stability of the washing machine at the drying stage. CONSTITUTION:The liquid removing stage of a drum type washing machine is controlled so that the revolving speed and acceleration of the drum are varied to their respective proper values. A drive control is performed so that the acceleration K2 till the reference frequency 140Hz at the second elapsed time T2 a certain period after the first elapsed time T1 is more gradual than the acceleration K1 till the reference frequency 100Hz as attaining the first elasped time a certain period after the starting point of liquid removal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a drum type washing machine, and more particularly to a drainage stroke control.

[0002]

2. Description of the Related Art It is common to increase the number of revolutions stepwise until a prescribed high-speed revolution is reached during the deliquoring process, but if the liquid deliquified from the drum exceeds the drainage capacity. , Collects in the outer tank. The accumulated liquid is rolled up on the outer peripheral wall of the drum to form a liquid film on the outer peripheral wall of the drum.
Therefore, this liquid film makes it impossible to drain any more liquid. In order to solve this, the drain pipe and the drain valve may be enlarged to increase the drainage capacity, but if the drain valve and the like are enlarged, it becomes expensive. In addition, when water is used as the washing liquid, if a large amount of water is discharged at once, the water may overflow from the drainage channel, so the drainage capacity cannot be increased unnecessarily.

Further, if the drum is rotated intermittently in order to prevent the liquid from accumulating, a disadvantage such as a long time until a predetermined high speed liquid removal rotation is brought about.

[0004]

SUMMARY OF THE INVENTION In view of the above problems in the dewatering process, the present invention is designed so that the liquid accumulated in the outer tub is collected in the outer tub so that the amount of the liquid accumulated in the outer tub cannot be wound up by a drum. The purpose is to control the liquid volume.

[0005]

According to the present invention, the acceleration of the second elapsed time T2, which is a certain time after the first elapsed time T1, is higher than the acceleration K1 of the first elapsed time T1, which is a certain time after the start of draining. The drive control is performed with a gentle K2.

[0006]

Therefore, since the amount of liquid drained to the outer tank during the first elapsed time T1 is large but the amount of liquid discharged is small during the operation of the second elapsed time T2, the outer tank has a drum outer periphery. Not enough liquid to be rolled up on the wall.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to an embodiment shown in FIGS.

FIG. 1 shows the overall construction of a dry cleaning machine capable of recovering a solvent. 1 is an outer tub, 2 is a drum which is rotatably arranged in the outer tub 1 and accommodates clothes therein, 3 Is a solvent tank for storing a solvent, 4 is a solvent tank 3
It is a liquid supply conduit for guiding the solvent therein to the outer tank 1, and a liquid supply pump 5 is interposed. Reference numeral 6 is a drain valve provided in a connection path between the bottom of the outer tank 1 and the tank 3.

Reference numeral 7 denotes an air passage provided above the outer tub 1 and connected at both ends to the outer tub 1, respectively, and comprises a blower fan 8, a cooler 9 using cooling water, and a heater using steam. 1
0 is provided inside, and an intake valve 11 and an exhaust valve 12 that are opened in the deodorizing process are provided. 13 is a cooling water valve provided in the cooling water pipe to the cooler 9;
Is a steam valve provided in the steam line to the heater 10,
5 is a water separator, and 16 is a thermistor for detecting the temperature of the outlet of the outer tub 1 to detect the drying temperature. Reference numeral 17 is a thermistor for detecting the temperature of the entrance into the outer tub 1 from the ventilation passage 7.
Then, the dry set temperature for safety control is detected. A liquid level sensor 25 detects the liquid level at the time of cleaning and the liquid level at the time of draining, and outputs a signal at the start of cleaning and at the time of completion of draining.

FIG. 2 shows a block circuit, 18 is a CP
A microcomputer (hereinafter referred to as a microcomputer) composed of U, ROM, RAM and the like, and 19 is an I / O port which is bus-connected to the microcomputer 18, and is a display provided on the operation panel of the dry cleaning machine. The device 20 and the keyboard 21 are connected.

Reference numeral 22 is a motor for rotating the drum 2.
It is controlled by the inverter 24 by a signal from the microcomputer 18. Reference numeral 23 is a frequency command section, which is a motor 22.
The frequency of rotation is controlled.

26.28 is a D / A converter, which is a microcomputer 1
The voltage data signals from 8 corresponding to various temperatures are converted into analog signals. Reference numerals 27 and 29 are comparators for detecting the temperature detected by the thermistor 16.17 by sequentially comparing the voltage signal from the thermistor with the analog signal.

Referring to the frequency control explanatory diagram of FIG. 5,
It is based on an experiment using a drum 2 having a diameter of 910 m / m, the horizontal axis represents the motor operating time (seconds), and the vertical axis represents the frequency (Hz) for controlling the motor rotation speed. Shows the acceleration situation for controlling the rotation of the drum 2.

After washing and draining the liquid through the drain valve 6, 15 Hz is applied to the motor for 5 seconds. At this time, the rotation speed of the drum becomes a low speed of about 38 rpm to loosen the entanglement of the load in the drum and eliminate the imbalance.

After that, 100 Hz (the number of rotations of the drum is 25
0 rpm) is the first elapsed time T of about 8 seconds.
As 1, the number of revolutions is controlled by the acceleration K1 to drain the liquid. When the frequency is increased beyond 100 Hz while the acceleration K1 is maintained, the amount of drainage increases and the amount of drainage and the amount of drainage from the drain valve 6 are unbalanced, and the liquid begins to accumulate in the outer tank 1. . Then, the liquid is immersed in the outer peripheral wall of the drum 2, and the liquid is wound up on the outer peripheral wall when the drum rotates. Therefore, K
The maximum acceleration is 100Hz.

In the subsequent acceleration control, the second elapsed time T2 is set to about 16 seconds until reaching 140 Hz (the rotational speed of the drum is 350 rpm), and the acceleration K2 is controlled more gently than the acceleration K1. During the acceleration K2 of the second elapsed time T2, drainage from the drain valve 6 is promoted, winding of the liquid on the outer peripheral wall of the drum 2 is prevented, and a ventilation path 7 provided above the outer tub 1 is provided. Prevents liquid from splashing to the side.

In order to maintain a predetermined rotation speed, 20
The third elapsed time T3 is 6 seconds until reaching 0 Hz (drum speed 350 rpm), and the drum is rotated at a high acceleration K3. After that, deliquoring is continued at this predetermined rotation speed.

Next, the flow charts of FIGS. 3 to 4 will be described. First, the drain valve 6 is opened to open the drain signal to start draining. The liquid level sensor 25 detects whether the drainage is completed (S
-1), the motor 22 drives the inverter. The rotation speed of the motor 22 is controlled to 15 Hz by a signal from the frequency command unit 23 and driven for 5 seconds.

[0019] Subsequently, every 0 or 1 second, 1H
By the acceleration K1 which increases the frequency by z (S-3),
The rotation speed is controlled during the first elapsed time and until reaching 100 Hz (S-4).

Next, by the acceleration K2 that increases the frequency by 1 Hz every 0.4 seconds (S-5), the rotation speed is controlled during the second elapsed time and until 140 Hz is reached ( S-6) Next, the acceleration K3 is 1 Hz every 0.1 second.
The frequency is gradually increased (S-7), and the third elapsed time T3 is reached until the predetermined liquid removal high-speed rotation frequency of 200 Hz is reached.
As a result, the frequency is regulated, and thereafter the liquid removal rotation control is performed at that rotation speed (S-8). When the set dewatering time has elapsed, the drain valve 6 is closed, the output of the inverter 24 and the output of the frequency command unit 23 are stopped, and the dewatering process ends.

Then, the process proceeds to the next drying step, but if the liquid is wound up by the drum during the liquid removing process, the liquid becomes a mist and is scattered in the ventilation passage 7. Therefore, the liquid (solvent) thus scattered during the drying process is evaporated by the circulating hot air, and the concentration of the solvent gas increases. Since the solvent is flammable, there is a risk of reaching the lower explosive limit concentration (0.6% or more), which prevents such a situation.

Although the above-mentioned acceleration varies depending on various conditions such as the diameter of the drum, when an experiment was conducted with the drum diameter of 910 mm, the acceleration K1 was about 26.5, K2 was about 6.3, and K was about 6.3.
When 3 was set to about 25, the liquid was not wound up by the drum even if the drainage capacity was kept the same.

[0023]

According to the present invention, the acceleration at the start of deliquoring is controlled so that the acceleration after a certain time elapses more slowly than the acceleration until a certain time elapses. Does not wind up when the drum is rotated, and a liquid film is formed on the outer peripheral wall of the drum, so that it is difficult for the liquid to be drained from the drum.

Further, it is possible to prevent the solvent scattered on the ventilation passage side during the drying process from evaporating and increasing the concentration of the solvent gas to prevent the concentration from exceeding the explosion lower limit concentration, thus providing a highly safe washing machine.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a drum type washing machine showing a first embodiment of the present invention.

FIG. 2 is a block circuit diagram of the same.

[Fig. 3] Similarly, a flow chart during the dewatering process

FIG. 4 is a flowchart following FIG.

FIG. 5 is an explanatory view of frequency control during liquid removal by frequency control.

[Explanation of symbols]

 1 Outer Tank 2 Drum 7 Ventilation Path 8 Blower Fan 9 Cooler 10 Heater 22 Motor 23 Frequency Command Section 24 Inverter

Claims (1)

[Claims] 1. In a drainage process of a drum type washing machine in which the rotation speed and the acceleration of the drum can be varied, respectively, the first acceleration is higher than the acceleration K1 at a first elapsed time T1 which is a certain time from the start of the drainage. A control device for a drum type washing machine, characterized in that an acceleration K2 of a second elapsed time T2 after a certain time has elapsed from the elapsed time T1 is made gentle.