JPH04336097A - Drum type washing machine - Google Patents

Abstract

PURPOSE:To increase the washing capacity by carrying out revolution in one time at a speed where a washed article adheres to the inner wall of a drum, at each revolution drive of the drum in plural times including at least one time of reverse revolution at a speed where the washed article is raised up and then dropped in repetition, in washing. CONSTITUTION:In washing, the revolution angle speed W0 with which the centrifugal force is made smaller than the gravitation force is generated so that a washed article 42 does not adhere to the inner surface of a drum 4 and is raised up and then dropped in repetition when the drum 4 revolves fundamentally. Further, in the reverse revolution, the revolution angle speed W1 with which the centrifugal force becomes larger than the gravitational force is generated so that the washed article 42 adheres to the inner surface of the drum 4. Revolution drive is performed plural times including at least one time of reverse revolution, at the revolution speed having the revolution angle speed W0 of the drum 4, and then the revolution drive is performed in one time in the reverse direction at the revolution speed having the revolution angle speed W1, and these operations are repeated. Accordingly, during the time where the washed article 42 is raised up and then dropped by the revolution of the drum 4, the washed article 42 sometimes adheres to the inner wall of the drum 4 and then dropped by the reduction of the revolution speed and stop, and these operations are repeated.

Description

[Detailed description of the invention]

[Object of the invention]

0002

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum-type washing machine that washes clothes by rotationally driving a horizontally arranged drum.

0003

[Prior Art] Conventionally, in drum-type washing machines,
The washing machine is equipped with a drum arranged horizontally, and the drum is rotated by a motor at a speed in which the laundry stored inside the drum is repeatedly raised and then dropped, thereby washing the laundry. ing.

0004

[Problems to be Solved by the Invention] In the case of the above-mentioned conventional device, when the amount of laundry is up to an appropriate amount, a certain washing effect can be obtained. However, if the amount of laundry exceeds the appropriate amount, the washing effect cannot be obtained sufficiently, and even uneven washing occurs. For this reason, conventional drum-type washing machines have had the problem that their washing capacity is limited compared to their size.

The present invention has been made in view of the above-mentioned circumstances, and its object is to effectively and evenly wash a large amount of laundry, thereby increasing the washing capacity. We are here to provide you with an excellent drum type washing machine.

[Configuration of the invention]

[0007]

[Means for Solving the Problems] In order to achieve the above object, in the drum type washing machine of the present invention, a drum disposed on a horizontal axis is rotationally driven by a motor, and the laundry stored in the drum is rotated. During washing, the drum is rotated multiple times, including at least one reversal, at a speed where the laundry is repeatedly lifted and then dropped, and each time the laundry is rotated at a speed that causes the laundry to stick to the inner wall of the drum. It is characterized by being rotated once.

[0008]

[Function] In conventional drum-type washing machines, if the amount of laundry stored in the drum exceeds the appropriate amount, the washing effect cannot be obtained sufficiently.The reason for this is that the distance the laundry falls within the drum decreases. In particular, the cause of uneven washing is that the laundry is less frequently replaced within the drum.

On the other hand, if the drum is rotated once at such a speed that the laundry clings to the inner wall of the drum every time the drum is rotated multiple times at a speed that repeats the laundry being lifted and then dropped, Each time, the laundry is stuck to the inner wall of the drum and then falls from the inner wall of the drum while the rotation speed decreases or when it stops, thus increasing the distance the laundry falls, thereby increasing the washing effect. . Moreover, in this case, the laundry can be frequently replaced, and the laundry can be washed evenly.

In addition, by rotating the drum at a speed in which the laundry is repeatedly lifted and dropped, at least one reversal is performed.
When the machine stops between the forward and reverse rotations, the laundry falls once and is then lifted up again, which also allows more laundry to be replaced, resulting in more even laundry.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a drum-type washing machine (drum-type washing/drying machine) having a drying function will be described below with reference to the drawings.

First, FIG. 2 shows an outer box 1 of the entire drum-type washer/dryer, and inside this outer box 1, a water reservoir tab 2 is supported by an elastic support mechanism 3. ing. A drum 4 is disposed within the tub 2 and is supported horizontally by a shaft 5 and a bearing 6. The drum 4 has a dewatering hole 7 formed on its peripheral side, a baffle 8, and a ventilation hole 9 formed on one end surface and a ventilation hole 10 formed on the other end surface. Further, an air supply port 1 is provided on one end surface of the tab 2 facing the ventilation hole 9.
1, and an exhaust port 12 is formed on the other end face facing the ventilation hole 10, and a duct 13 is connected between the air supply port 11 and the exhaust port 12, and a duct 13 is provided at the upper part outside the tab 2. A blower 14 (see FIG. 3) and a heat exchanger (
(not shown) and a heater 15 are provided.

On the other hand, a motor 1 is mounted on the outer bottom surface of the tab 2.
A belt transmission mechanism 21 consisting of pulleys 18, 19 and a belt 20 is provided between the rotating shaft 17 of the motor 16 and the shaft 5 of the drum 4. 16 rotations are transmitted to the drum 4. In this case, belt transmission mechanism 2
The reduction ratio of 1 is set to 10:1, for example. Further, the motor 16 is, for example, a DC brushless motor equipped with a three-phase stator winding.

Furthermore, an electromagnetic water supply valve 22 is installed in the upper part of the outer box 1.
has been established. This electromagnetic water supply valve 22 is a switchable type, and can be switched between supplying water into the tub 2 through the detergent dispenser 23 and supplying water not through the detergent dispenser 23.

Further, a drain channel 25 leading out of the outer box 1 from a drain port 24 is provided at the outer lower part of the tub 2, and an electromagnetic drain valve 26 is interposed in the drain channel 25. Drainage channel 2
A pressure guide pipe 27 is connected to the vicinity of the drain port 24 of No. 5, and an air trap 28 is provided at the upper end of the pressure guide pipe 27. Air pressure within this air trap 28 is applied to a water level sensor 30 via a pressure tube 29. Further, an operating section 31 is provided on the upper surface of the outer box 1, and this operating section 31 is provided with various switches 32 and a display section 33 (see FIG. 3 for both).

Next, the electrical configuration will be described with reference to FIG. The control device 34 includes a microcomputer, and includes washing (washing and rinsing)
, an operating program for controlling dehydration and drying operations is stored. This control device 34 controls the rotational speed of the drum 4 by appropriately specifying and controlling the rotational speed of the motor 16.

The control device 34 receives a rotational speed designation signal S.
Three-phase logic control circuit 35 with a as variable speed control means
It is designed to be given to This three-phase logic control circuit 35 includes a three-phase logic circuit 36 and a motor drive circuit 37.
It consists of In this case, the three-phase logic control circuit 35
When the rotation speed designation signal Sa is given from the control device 34, P of the duty ratio according to the rotation speed designation value is determined.
The WM signal is given to the three-phase logic circuit 36. The three-phase logic circuit 36 has a three-phase power transistor arm, and is supplied with DC power from a DC power supply circuit 39 that converts AC power from a commercial AC power supply 38 into DC power.

The three-phase logic control circuit 35 also includes a Hall IC 4 which is a position detection element included in the motor 16.
A position detection signal from 0 is given, and the stator winding energization timing is determined based on this position detection signal. Furthermore, the position detection signal from the Hall IC 40 is also treated as a rotation speed (rotation angular velocity) detection signal, and the three-phase logic control circuit 35 corrects the PWM signal to match the specified rotation speed value based on this rotation speed detection signal. It is supposed to be done.

The three-phase logic circuit 36 adjusts the input voltage from the DC power supply circuit 39 using the PWM signal from the three-phase logic control circuit 35 and outputs it to the motor 16. As a result, the motor 16 has a rotational speed corresponding to the voltage applied by the three-phase logic circuit 36.

In addition, the control device 34 controls the water supply valve 22, the drain valve 26, the blower 14, and the heater 15 by a drive circuit 41 in accordance with the switch signals from the various switches 32 and the water level detection signal from the water level sensor 30. In addition, the display section 33 is controlled, and the motor 16 is further controlled to be driven via the motor drive circuit 37, thereby controlling the overall operation.

The details of the operation control by the control device 34 will be described below with reference to FIGS. 1, 4, and 5.

First, during washing (washing and rinsing), the drum 4 is rotated at a rotational speed such that the rotational angular velocity is ω0 defined by the following equation.

[0023]

[Math 1]

[0024] Here, r is the radius of the drum 4, and g is the gravitational acceleration.

[0025] Here, the method for calculating the rotational angular velocity ω0 will be briefly explained. As shown in FIG. 4, when the drum 4 is rotating at a rotational angular velocity ω, a centrifugal force F acts on the laundry 42 (see FIG. 5) housed in the drum 4.
teeth,

[0026]

[Math 2]

[0027] However, m is the mass of the laundry 42.

On the other hand, the gravity G acting on the laundry 42 is as follows: G=mg
...(3).

During washing, basically, as shown in FIG. 5(a), when the drum 4 is rotating, the laundry 42 is lifted without sticking to the inner surface of the drum 4. Since the object is to fall repeatedly, the centrifugal force F is set to be smaller than the gravity G, for example, about 80%. That is,

[0030]

[Math 3]

##EQU00003## In this equation, the above equation (2) and (3) are added.
Substituting the expression,

[0032]

[Math 4]

[0033] This is the rotational angular velocity ω0 expressed by equation (2). Note that this rotational angular velocity ω0 is determined by the rotational speed n0 [r. p. m ]
It can be converted into .

[0034]

[Math 5]

[0035] Here, if r=0.225 [m],
n0 =56.4[r. p. m ]. Also, r=
If it is 0.250 [m], n0 = 53.5 [r. p
．． m ].

At such a rotational speed, the drum 4 is rotated at least once in reverse as shown in FIG. 1 (see FIG. 5(b)).
The drum 4 is rotated multiple times (in the illustrated example, three times: forward rotation, reverse rotation, and normal rotation), and then the drum 4 is rotated in the reverse direction at a rotational speed such that the rotational angular velocity is ω1 defined by the following formula. Drive one rotation.

[0037]

[Math 6]

[0038] This is to make the centrifugal force F larger than the gravitational force G, that is, F>G
...(8), formula (2) and (
3) The result of substituting the expression,

[0039]

[Math 7]

This is because the laundry 42 sticks to the inner wall of the drum 4 as shown in FIG. 5(c). Note that this rotational angular velocity ω1 is expressed as a rotational velocity n1 [r. p. m], r=0
．． 225 [m], n1 >63.1 [r. p. m
], and in the case of r = 0.250 [m], n1 > 5
9.8[r. p. m ].

After this, the drum 4 is driven to rotate at a rotational speed such that the rotational angular velocity becomes ω0. Then, during the period when the rotation speed decreases or when the rotation speed stops, the
As shown in (d), the laundry 42 clings to the inner wall of the drum 4, then falls, is then lifted up, and then falls down, which is repeated.

Then, the drum 4 is driven to rotate at a rotational speed at which the rotational angular velocity becomes the first ω0, including at least one reversal, as described above, and then the drum 4 is driven again at a rotational speed at which the rotational angular velocity becomes the first rotational angular velocity ω0. It is rotated once in the reverse direction at a rotational speed of ω1. Then, as described above, during the period when the rotation speed decreases or when the rotation speed stops, the laundry 42
The drum sticks to the inner wall of the drum 4 and then falls, then is raised and then falls, which is repeated.

[0043] The above steps are repeated to perform a washing operation. As a result, as the laundry 42 is repeatedly raised and then dropped by the rotation of the drum 4, it occasionally gets stuck to the inner wall of the drum 4, and the laundry 42 is sometimes stuck to the inner wall of the drum 4 while the rotation speed decreases or when the drum 4 stops. Since the laundry 42 repeatedly falls from the inner wall, the falling distance of the laundry 42 can be increased, so that the washing effect can be improved not only when the laundry 42 is a small amount or an appropriate amount, but also when it is a large amount. Can be done. Further, in this case, the laundry 42 can be frequently replaced, and the laundry can be washed evenly.

In addition, while the drum 4 is being driven to rotate at a speed in which the laundry 42 is repeatedly lifted and then dropped,
By performing at least one reversal, the laundry 42 can be dropped once during the stop between the forward and reverse rotations, and then lifted up again, which also increases the number of times the laundry 42 is replaced. The laundry 42 can be washed more evenly.

[0045] Regarding the present invention, Japanese Patent Application Laid-Open No.
As shown in Japanese Patent No. 249591, there is an idea of driving the drum 4 to rotate at two different rotational speeds by changing the rotational speed at predetermined time intervals. There is no reversal as in the above, and the above-mentioned effect of increasing the number of replacements of the laundry 42 due to this reversal cannot be obtained.

[0046] Therefore, the dehydration operation after the washing operation is as follows:
Drum 4 was heated to 800 to 1000 [r. p. m ] by rotating in one direction at a high speed.

The drying operation is carried out by rotating the drum 4 in the same manner as in the washing operation, and in this case, the blower 14 is driven and the heater 15 is made to generate heat (in this case, the drum 4 is rotated). By rotating the washing machine in the same way as in the above-mentioned washing operation, laundry can be dried effectively and evenly.

Note that the specific speed and number of rotations during each operation are not limited to those described above.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, but can be implemented with appropriate modifications within the scope of the gist.

[0050]

[Effects of the Invention] As is clear from the above description, the drum-type washing machine of the present invention washes the laundry stored in the drum by driving the drum arranged horizontally in rotation with a motor. During washing, the drum is rotated once at a speed that causes the laundry to stick to the inner wall of the drum each time the drum is rotated multiple times, including at least one reversal, at a speed where the laundry is repeatedly lifted and then dropped. This feature allows the laundry to fall over a larger distance and can be replaced more frequently, allowing large amounts of laundry to be washed effectively and evenly, increasing the washing capacity. It has the excellent effect of achieving

[Brief explanation of drawings]

FIG. 1 is a time chart for rotation of a drum during washing, showing an embodiment of the present invention.

[Figure 2] Vertical side view of the entire washing machine

[Figure 3] Schematic electrical configuration diagram

[Figure 4] Longitudinal front view of the drum part for explaining the function

[Figure 5]
A vertical sectional front view of the drum part for explaining the effect of the different laundry conditions in (a) to (d)

[Explanation of symbols]

4 is a drum, 16 is a motor, 34 is a control device, 37 is a motor drive circuit, and 42 is laundry.

Claims (1)

[Claims] Claim 1: A drum disposed on a horizontal shaft is rotated by a motor to wash laundry stored in the drum, and during washing, the drum is rotated.
A drum characterized in that the laundry is rotated once at a speed that causes the laundry to stick to the inner wall of the drum every time the laundry is rotated multiple times including at least one reversal at a speed where the laundry is repeatedly lifted and then dropped. washing machine.