JP2012192065A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress generation of noise caused by collision of laundry with water in a rotary drum at a high speed during high-speed rotation of the rotary drum.SOLUTION: A drum-type washing machine is configured to perform: a water supply step of supplying water until reaching a first water supply target; a first beat washing step of supplying water until reaching a second water supply target; a subsequent washing-by-squeezing step; and a second beat washing step of supplying water until reaching a third water supply target. The second water supply target is lower than the third water supply target, and, in the first beat washing step, a rotary drum 3 is rotated at a first rotation speed that is lower than a second rotation speed in the washing-by-squeezing step. Accordingly, laundry is less likely to collide with water within the rotary drum 3 at a high speed, so that an effect of reducing noise can be achieved.

Description

  The present invention relates to a drum-type washing machine that performs rotary washing by rotating a rotating drum at a high speed.

  A conventional drum-type washing machine rotates a rotating drum loaded with laundry at a low speed forward and reverse, repeatedly lifts the laundry along the peripheral surface by a baffle inside the rotating drum, and drops it repeatedly. Washing is performed by so-called washing, in which dirt is removed by impact when an object falls from the top of the rotating drum. Then, in the process following tapping washing, the rotating drum loaded with the laundry is rotated forward and backward at high speed, and the laundry is stuck to the inner peripheral surface of the rotating drum. It is considered that washing is performed by so-called squeezing (see, for example, Patent Document 1).

  FIG. 3 is a cross-sectional view of a conventional drum-type washing machine described in Patent Document 1.

  As shown in FIG. 3, a washing tub 32 is arranged inside a main body case 31, and a bottomed cylindrical rotating drum 33 is inside. A large number of through holes 34 through which water passes are arranged on the entire outer periphery of the rotary drum 33. The control device 35 controls the motor 36 that rotates the rotary drum 33 to control the rotation of the rotary drum 33.

  During washing, the door 37 leading to the rotating drum 33 is opened and the laundry is put in. When washing is started by the control device 35, the water supply valve 38 is opened and water is supplied into the washing tub 32.

  As a first washing step after water supply, the rotating drum 33 is rotated at a low speed (for example, 50 r / min), and the laundry in the rotating drum 33 is lifted and dropped to remove moisture and dirt contained in the laundry. Dash and wash out by dropping impact. The water level in this washing process is such that the laundry in the rotary drum 33 is sufficiently wetted.

  Next, as a second washing step, the rotating drum 33 is rotated at a high speed (for example, 200 r / min), and the laundry in the rotating drum 33 is pressed against the inner wall of the rotating drum 33 by centrifugal force. The so-called squeezing is performed to remove the dirt.

JP-A-8-299658

  In the conventional drum type washing machine, the water level of the washing liquid in the rotary drum 33 is in a state where water is filled to wet the laundry.

  Therefore, when the rotary drum 33 is rotated at a high speed in the above-mentioned squeeze washing, water in the rotary drum 33 and the laundry collide at a high speed, resulting in a problem that noise is generated.

  Therefore, an object of the present invention is to reduce noise generation when a rotating drum is rotated at a high speed.

  In order to achieve this object, the present invention provides a main body case, a washing tub provided in the main body case, and a bottomed cylinder in which a rotation center axis is disposed in a substantially horizontal direction in the washing tub. A rotating drum, a driving means for rotating the rotating drum, a water supply means for supplying water into the rotating drum, and a control means for controlling the water supply means and the driving means. A water supply step for supplying water to the rotating drum up to a first water supply target water level, and after the water supply step, the rotating drum is supplied to the second water supply target water level in the state where water is supplied to the first water supply target water level. A first scrubbing step that rotates at a rotational speed of squeezing, and a scrubbing step of rotating the rotating drum at a second rotational speed that is faster than the first rotational speed after the first scrubbing process; Squeezing Then, after supplying water to the third target water level in the rotating drum, a second scrubbing step of rotating the rotating drum at a first rotational speed is performed, thereby achieving the intended purpose. To achieve.

  In the drum type washing machine of the present invention, when the rotating drum rotates at a high speed, the water supply means is in a non-water supply state in the second washing step in which the rotating drum rotates at a high speed. The laundry is less likely to collide at high speed, and as a result, noise can be reduced.

Side sectional view of the drum-type washing machine according to Embodiment 1 of the present invention. Timing diagram showing the operation of the drum type washing machine Side view of a conventional drum-type washing machine

(Embodiment 1)
FIG. 1 is a side sectional view of a drum type washing machine according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a plastic washing tub 2 is suspended in a box-like body case 1 by a suspension structure (not shown). In the washing tub 2, a metal-made bottomed cylindrical rotary drum 3 is arranged in a substantially horizontal direction. The substantially horizontal direction includes the case where the rotating drum 3 is arranged in the horizontal direction and the case where the opening (on the side opposite to the bottom) is slightly inclined as shown in FIG. It is a waste.

  A large number of through holes 4 communicating with the inside of the washing tub 2 are formed on the entire outer periphery of the rotating drum 3, and plastic baffles 5 are provided at a plurality of positions on the inner peripheral surface.

  The rotating drum 3 can be driven to rotate in the forward and reverse directions by a motor 6 which is a driving means attached to the back side of the washing tub 2.

  A plastic door 7 is provided on the front side of the washing tub 2, and the laundry can be taken in and out of the rotating drum 3 by opening the door 7.

  Moreover, the water supply valve 9 and the water supply piping 10 are connected to the washing tub 2 as the water supply means 8, and water supply is performed. A drain pipe 11 is connected to the bottom of the washing tub 2 and drained from the washing tub 2 under the control of the drain valve 12.

The water supply pipe 10 is provided with a detergent case 13 for introducing detergent on the way. Further, a water level detecting means 14 for detecting the level of the washing liquid in the washing tub 2 is connected to the lower part of the washing tub 2. The motor 6 is provided with a rotation speed detection means 20 that detects the rotation speed of the motor 6.

  A water stop valve 16 is connected to the bottom of the washing tub 2 in parallel with the drain valve 12, and a circulation pump 15 is provided downstream of the water stop valve 16. The washing liquid discharged from the circulation pump 15 is configured to be discharged into the rotating drum 3 from the discharge port 18 through the opening of the front surface of the rotating drum 3 via the circulating water channel 17.

  A heater (heating means) 19 for heating the washing liquid in the washing tub 2 is provided at the bottom of the washing tub 2.

  Further, in the main body case 1, information from the water level detection means 14 is obtained, and the motor 6, the water supply valve 9, the drain valve 12, the circulation pump 15, the water stop valve 16, the heater 19, etc. are controlled to wash, Control means 21 is provided for controlling the rinsing and dehydration processes to be executed sequentially.

  About the drum type washing machine comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  FIG. 2 is a timing chart showing the operation of the drum type washing machine in the first embodiment of the present invention.

  The user opens the door 7, puts the laundry into the rotating drum 3, puts the detergent into the detergent case 13, and starts the operation of the drum type washing machine.

  At this time, the amount of laundry in the rotating drum 3 is detected in the following manner. By driving the motor 6 to rotate, the motor 6 is temporarily raised to a third rotational speed (for example, about 100 to 140 r / min) that is a rotational speed at which the laundry sticks to the inner wall surface of the rotary drum 3, and is rotated for a predetermined time. After the maintenance, the motor 6 is turned off. Thereby, the inertial rotation of the rotating drum 3 is in a state of rotating the motor 6 in reverse. At this time, the inertial rotational force of the rotating drum 3 gradually decreases due to the friction torque, and the rotating drum 3 stops eventually. The time from the stop of energization to the stop of the rotating drum 3 is long when the amount of laundry is large and short when the amount of laundry is small. The amount of laundry is detected using the fact that the difference in time required for this stop is proportional to the amount of laundry.

  In this manner, the amount of laundry is measured, and water is supplied by the water supply means 8 including the water supply valve 9 and the water supply pipe 10 up to the first water supply target water level corresponding to the amount of the washing liquid. At this time, the motor 6 is driven to rotate the rotary drum 3. This is performed to promote the dissolution of the detergent supplied from the detergent case 13 in the washing water. When the water level reaches the first water supply target water level, the water supply is stopped, and the process proceeds to the next first washing process.

  In the first scrubbing step, the rotating drum 3 rotates at the first rotation speed. The first rotational speed is a rotational speed at which the laundry is lifted by the baffle 5 provided on the inner peripheral surface of the rotary drum 3 and falls by gravity from above, and centrifugal force is applied to the inner wall surface of the rotary drum 3. A rotation speed lower than 60 r / min, which does not stick to the surface, is desirable. By rotating in this way, it becomes possible to peel off the dirt substance remaining on the fiber due to the impact at the time of dropping. The first rotation speed is not limited to the same embodiment, and can be selected depending on the amount of laundry and the radius of the rotating drum.

  In the first washing process, the drain valve 12 is closed and the water stop valve 16 is opened to bring the circulation pump 15 and the washing tub 2 into communication with each other, and then the circulation pump 15 is activated. Let The washing water collected at the bottom of the washing tub 2 is pumped by the circulation pump 15 and discharged from the discharge port 18 toward the laundry in the rotating drum 3 through the circulation water channel 17.

  Since the washing liquid supplied in the water supply process is absorbed by the laundry as the first tapping process proceeds, the water level in the washing tub 2 gradually decreases.

  For this reason, the water level detection means 14 detects the water level in the washing tub 2, and in order to avoid air biting into the circulation pump 15, additional water is supplied when the first specified water level is reached. The first specified water level is a water level at which the circulation pump 15 can be driven without air-engaging.

  In this water supply process, water is supplied into the washing tub 2 to a second target water level lower than the first target water level.

  By repeating the above operation for a predetermined time, the first washing process is executed. When a predetermined time has elapsed, the process proceeds to the next squeezing process.

  In the squeezing and washing step, the laundry stored in the rotary drum 3 is stretched on the inner peripheral surface of the rotary drum 3 by rotating the rotary drum 3 at a second rotational speed higher than the first rotational speed. Then, the operation of continuing to rotate is executed.

  After the squeezing washing step, a second tapping washing step of rotating the rotating drum 3 at the first rotational speed after supplying water to the third water supply target water level higher than the second water supply target water level in the rotating drum 3 is performed. Do.

  After completion of the washing process, the washing liquid is discharged from the drain pipe 11 by opening the drain valve 12, and the washing liquid contained in the laundry is dehydrated by the dehydration process of rotating the rotary drum 3 at a high speed.

  Thereafter, a rinsing step is performed by pouring water into the washing tub 2 from the water supply pipe 10.

  Also in this rinsing step, the laundry stored in the rotary drum 3 is rinsed by repeating the stirring operation of being lifted and dropped by the baffle 5 by the rotation of the rotary drum 3.

  After the rinsing process, the rinsing liquid is discharged from the drain pipe 11, and the rinsing liquid contained in the laundry is dehydrated by a dehydrating operation of rotating the rotary drum 3 at a high speed, and the washing is completed.

  Hereinafter, the feature points in the present embodiment will be described in more detail.

  In the first tapping process, the second water supply target water level is equal to or higher than the height at which the circulation pump 15 can be driven, and the laundry falling in the rotating drum 3 has its water surface on the inner peripheral surface of the rotating drum 3. The water level that collides with the target water level is the target water level, which is lower than the first water supply target water level.

  With this water level, when the rotary drum 3 is rotated at a high speed in the subsequent squeezing and washing step, noise generated by the collision of the rotary drum 3 and water is reduced.

  Moreover, since the amount of water with respect to clothes is lower than before by setting the second water supply target water level as the target water level, the detergent can be washed in a high concentration state, so that the cleaning effect is improved. can get.

  Note that the first water supply target water level, the second water supply target water level, and the third water supply target water level may be absolute water levels or water levels corresponding to the amount of laundry.

  In the first washing process, when the water level falls below the second target water supply level, water is supplied by the water supply valve 9 of the water supply means 8, but even if the water supply means 8 is operated continuously, It may be operated intermittently.

  In the squeezing and washing process, the water supply means 8 is in a non-water supply state, and the rotary drum 3 is rotated at the second rotational speed with the drain valve 12 closed.

  At this time, since the water level at the end of the first washing process is as low as the lower end of the rotating drum 3, even if the rotating drum 3 is rotated at a high speed, collision between the washing liquid and the laundry or the baffle 5 is prevented. As a result, generation of noise and vibration can be suppressed. Furthermore, there is an effect that the burden on the motor 6 can be reduced.

  As shown in FIG. 2, the water level in the squeezing washing process is included in the laundry after the washing liquid in the washing tub 2 is rolled up by the wind pressure generated by the rotation of the rotating drum 3 at a high speed and rapidly drops. Since the washing liquid that has been discharged flows out of the rotating drum 3 due to centrifugal force, it gradually rises.

  The second rotational speed in the squeezing and washing step is preferably about 300 to 500 r / min. By rotating the rotating drum 3 at such a high speed, the laundry in the rotating drum 3 is pressed against the inner peripheral surface of the rotating drum 3 by centrifugal force, and the washing liquid soaked into the laundry is absorbed by the inner periphery of the rotating drum 3. It is squeezed out of the rotating drum 3 through a large number of through holes 4 in the surface. When this squeezing washing step and the first tapping washing step are executed together, the washing effect is further enhanced.

  Next, in the second washing process, the rotation speed of the rotary drum 3 is preferably lower than 60 r / min, which is the same level as that in the first washing process. Further, in the second beat washing, the rotation speed at the first beat washing is not limited to the same as the rotation speed at the first beat washing, but the rotation speed at the first beat washing is higher than the rotation speed at the second beat washing. It can be low or high. This is because by rotating the rotating drum 3 at a low speed, it is only necessary to obtain an effect of removing dirt due to an impact when the laundry drops from the upper part of the rotating drum 3.

  In addition, the 3rd water supply target water level in a 2nd beat washing process makes a position higher than a 2nd water supply target water level a target water level, and may be comparable as a 1st water supply target water level.

  In addition, in the water supply process, the first tapping washing process, the squeezing washing process, and the second tapping washing process, the water accumulated at the bottom in the washing tub 2 is absorbed by the circulation pump 15, via the circulation water channel 17, It is discharged from the discharge port 18 into the rotary drum 3.

  As shown in FIG. 2, the circulation pump 15 is continuously operated and the cleaning water is discharged from the discharge port 18. However, the present invention is not limited to this, and the timing for operating the circulation pump 15 is continuous. May be intermittent. When the predetermined time has elapsed, the second washing process is terminated, and the process proceeds to the rinsing process.

  Note that the motor 6 that rotates the rotating drum 3 is intermittently operated in the first and second washing steps, but is not limited thereto, and may be operated continuously. good. The rotation direction of the rotary drum 3 is the first direction with respect to the rotation axis. However, the rotation drum 3 rotates in the second rotation direction opposite to the first direction, and the first and second rotation directions are the same. It can also be implemented by controlling to rotate alternately.

  In addition, the drive time per unit time of the circulation pump 15 in this process may be longer than the drive time per unit time of the circulation pump 15 in the second washing process. Thereby, also in the 1st scrub washing process which stirs at a low water level, a washing | cleaning liquid can be made to act on laundry efficiently, and washing | cleaning efficiency can be improved.

  In addition, since the heater 19 which heats the water stored in the washing tub 2 is provided, since it can be heated to a higher temperature in the same heating time in the first tapping washing process in which washing is performed with a small amount of water, there is little There is an effect that the cleaning performance can be further improved by the power consumption. Although not shown in FIG. 2, air circulation can be prevented by stopping the circulation pump 15 while energizing the heater 19 and increasing the water level so that the heater 19 is immersed in the washing liquid.

  In addition, although the 1st beat washing process and the 2nd beat washing process are implemented once each, it is not limited to this Embodiment, You may implement several times.

  The rotating shaft of the rotating drum 3 is not limited to the present embodiment, and has a structure in which the central axis direction is inclined upward from the back side to the front side even if it is horizontal. May be.

  The position of the washing liquid discharge port 18 is not particularly limited to the position shown in FIG. 1 and may be any position as long as the washing liquid can be discharged onto the laundry.

  Since the washing machine of the present invention can reduce noise when the rotating drum rotates at high speed, it can also be applied to uses such as a washing dryer having a drying function and a centrifugal separator.

DESCRIPTION OF SYMBOLS 1 Main body case 2 Washing tank 3 Rotating drum 4 Through-hole 5 Baffle 6 Motor 7 Door 8 Water supply means 9 Water supply valve 10 Water supply pipe 11 Drain pipe 12 Drain valve 13 Detergent case 14 Water level detection means 15 Circulation pump 16 Water stop valve 17 Circulation Water channel 18 Discharge port 19 Heater (heating means)
21 Control means

Claims (5)

A body case,
A washing tub provided in the main body case;
In the washing tub, a bottomed cylindrical rotating drum in which a rotation center axis is arranged in a substantially horizontal direction;
Drive means for rotationally driving the rotary drum;
Water supply means for supplying water into the rotating drum;
Control means for controlling the water supply means and the drive means,
The control means includes
A water supply step of supplying water to the rotating drum to a first water supply target water level;
After the water supply step, in a state where water is supplied to the second water supply target water level in the rotary drum, a first scrubbing step of rotating the rotary drum at a first rotation speed;
After the first scrubbing step, a squeezing step of rotating a rotating drum at a second rotational speed that is faster than the first rotational speed;
After the squeezing and washing step, the second drum washing step of rotating the rotary drum at a first rotation speed after supplying water to the third target water level in the rotary drum is performed. Drum-type washing machine. The drum-type washing machine according to claim 1, further comprising a circulation pump that draws washing water in the washing tub, and the control unit drives the circulation pump in the squeeze washing process. The drum type washing machine according to claim 1 or 2, wherein the second water supply target water level is equal to or higher than a height water level at which the circulation pump can be driven. Included is a cloth amount detecting means for detecting the amount of laundry put into the rotating drum, and the control means changes the first water supply target water level according to the cloth amount detected by the cloth amount detecting means. The drum type washing machine according to any one of claims 1 to 3, wherein 5. The heating means for raising the temperature of the washing liquid is provided in the washing tub, and the control means drives the heating means in the first scrubbing step. 2. A drum type washing machine according to item 1.

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