JP2013052054A - Drum type washing machine, and program thereof - Google Patents

Abstract

To provide a washing machine that suppresses vibration and noise during dehydration and has excellent dehydration performance by evenly attaching laundry to the inner wall surface of a washing and dehydrating tub at the start of the dehydration operation.
A washing and dewatering tub having a plurality of holes that is rotatable about a horizontal axis and contains a laundry, a water tub that houses the washing and dewatering tub, and a water supply means that directly supplies water to the laundry, A driving means for driving the washing / dehydrating tub; a driving means that is at least a first rotational speed at which the laundry does not stick to the inner wall of the washing / dehydrating tub; The control unit continuously controls the driving means while operating the water supply means for the laundry at a position higher than the horizontal axis of the washing / dehydrating tub when dehydration is started. Thus, the first rotational speed is changed to the second rotational speed.
[Selection] Figure 1

Description

  The present invention includes a washing and dewatering tub that can be rotated by accommodating laundry in an elastically supported water tub, and washing, rinsing, dehydrating and drying the laundry in the washing and dewatering tub Or it relates to a washing dryer.

  In the conventional drum-type washing machine, first, after the laundry is put into the washing and dewatering tub, tap water is supplied from the outside of the washing machine by the water supply means. The washing water containing the detergent component is poured into the receiving cylinder or the washing and dewatering tub that accommodates the washing and dewatering tub through the detergent container in which the detergent has been put in advance. After water pouring, the laundry is fully wetted with washing water, and then the washing and dewatering tub rotates at a low speed so that the laundry does not stick to the wall surface of the washing and dewatering tub for a certain period of time. Accordingly, the washing is performed by removing the dirt by the impact when the wet laundry falls from the upper part of the washing and dewatering tank as it rotates. After a series of cleaning operations is completed in this manner, rinsing and dehydration are performed. A short-time dehydration operation called intermediate dehydration in the rinsing process and a full-scale dehydration operation in the dehydration process are performed. At the time of dehydration activation, in order to suppress vibration and noise, it is necessary to evenly apply the laundry to the inner wall surface of the washing and dehydrating tub. At the start of the dewatering operation, the drain valve is operated while the washing and dewatering tub is stopped, and the washing water in the water tub is drained outside the apparatus. Thereafter, the laundry and dewatering tub is rotated at a low speed so that the laundry floats in the air so that the laundry is evenly adhered to the inside of the laundry and dewatering tub as much as possible. When the laundry is evenly adhered, the rotation speed of the washing and dewatering tub is increased to, for example, 800 rpm, at which a full-fledged dehydration effect is obtained (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 5-31292

  However, in the drum type washing machine described above, it is rare that the laundry is evenly adhered to the wall surface of the washing and dewatering tub simply by rotating the washing and dewatering tub at the start of the dewatering operation. This is because the fabric quality of the laundry put into the washing and dewatering tank is rarely the same. Jeans, jerseys, and the like, such as chemical fiber and cotton, have different fabric qualities, so the initial dewaterability, that is, the ease of water removal, varies greatly. Therefore, when the laundry / dehydration tub is rotated at a rotation speed of about 80 to 100 rpm at which the laundry is stuck to the wall surface of the laundry / dehydration tub, the laundry is lifted to a position above the horizontal axis of the laundry / dehydration tub. The jersey with good dehydration makes it easy for water to drain and clothes to stick quickly. On the other hand, cotton jeans that do not easily drain water tend to form dumplings. In this way, the more clothes with different dewatering properties coexist, the more difficult it is to stick uniformly as a whole. As a result, the cloth (unbalance) on the wall of the washing / dehydrating tub is generated, and the vibration during dehydration and There was a problem that noise was generated.

  The present invention solves the above-mentioned conventional problems, and at the start of the dehydrating operation, the laundry is evenly attached to the wall surface of the washing and dehydrating tub to suppress vibration and noise during dehydration, and has excellent dewatering performance. An object is to provide a washing machine.

In order to solve the above-described conventional problems, the drum type washing machine of the present invention accommodates laundry and is rotatable about a horizontal rotation axis or a rotation axis inclined downward from the front side toward the back side. A washing / dehydrating tub having a plurality of holes, a water tub for housing the washing / dehydrating tub, water supply means for directly supplying water to the laundry, driving means for driving the washing / dehydrating tub, and writing drive means And a controller that performs a dehydrating operation by controlling the laundry, and when the dehydration is activated, the controller lifts the laundry above the rotating shaft and does not stick to the wall surface of the washing and dehydrating tub. The driving means is driven so that the rotation speed and the laundry become a second rotation speed that sticks to the inner wall of the washing and dewatering tank, and the laundry and dewatering tank is driven at the first rotation speed, The water with respect to the laundry located above the rotation axis While providing water by feeding means, in which so as to change to the second speed.

  With such a configuration, the rotation speed is changed while supplying water to the laundry located above the rotation axis of the washing / dehydrating tub during low-speed rotation where the laundry is attached to the wall surface of the washing / dehydrating tub. Thus, the moisture content of the laundry can be kept constant. In this state, by increasing the rotation speed of the washing / dehydrating tank at once, uniform centrifugal force can be instantaneously applied to each laundry, and the laundry can be evenly adhered to the wall surface of the washing / dehydrating tank. For this reason, the laundry is not unbalanced and vibration and noise during dehydration can be suppressed.

  The drum type washing machine of the present invention can easily and evenly attach the laundry to the wall surface of the washing and dehydrating tub when dehydration is started, and can perform a dehydrating operation with reduced vibration and noise.

Sectional drawing which shows schematic structure of the drum type washing machine in Embodiment 1 of this invention The block diagram which shows the structure of the control apparatus of the drum type washing machine (A) The figure which shows the flow of water at the time of rotation of the drum type washing machine (b) The figure which shows an example of the circulation shower of the drum type washing machine Time chart at the time of dehydration of the drum type washing machine (A) The figure which shows the behavior of the laundry at the time of the dehydration start of the conventional drum type washing machine (b) The figure which shows the behavior of the laundry at the time of the dehydration start of the drum type washing machine in Embodiment 1 of this invention. The figure which shows the behavior of the laundry when the rotation speed of the drum type washing machine in Embodiment 1 of this invention is increased.

  A drum-type washing machine according to a first aspect of the present invention accommodates laundry and is rotatable around a horizontal rotation shaft or a rotation shaft inclined downward from the front side toward the back side and having a plurality of holes. A water tub, a water tub for housing the washing / dehydrating tub, a water supply means for directly supplying water to the laundry, a driving means for driving the washing / dehydrating tub, and a dehydrating operation by controlling the driving means. A control unit, and when the dehydration is started, the control unit lifts the laundry above the rotation shaft and does not stick to the wall surface of the washing and dehydrating tub. The driving means is driven so as to have a second rotational speed that sticks to the inner wall of the washing / dehydrating tub, and the laundry / dehydrating tub is driven at the first rotational speed while being positioned above the rotation shaft. While giving water to the laundry by the water supply means It is obtained so as to change to the second speed.

  With such a configuration, water is always supplied to the laundry by the water supply means with respect to the laundry located above the level of the horizontal axis of the washing / dehydrating tub. While keeping the moisture content of the water constant, the number of rotations of the washing and dewatering tank can be increased at once. For this reason, it becomes possible to apply a uniform centrifugal force to the laundry instantly and evenly attach the laundry to the wall surface of the washing and dewatering tub, thereby suppressing vibration and noise during dehydration. In addition, the dehydration time can be shortened by stopping or inverting the washing / dehydrating tank in order to eliminate imbalance. Therefore, dehydration operation with high energy saving is possible.

  In the second invention, in particular, the control unit of the drum-type washing machine according to the first invention starts the dehydrating operation in a state where there is water in the water tank, and the water supply means is provided at the bottom of the water tank. The accumulated water is sucked and discharged to the laundry in the washing and dewatering tub.

  With such a configuration, the water supply means can save water by reusing water accumulated at the bottom of the water tank without using new water. Moreover, since water is repeatedly applied to the laundry at the start of the dehydration operation, the rinsing performance can be improved.

  The third aspect of the invention is particularly provided with a cloth amount detecting means for detecting the amount of the laundry according to the first or second aspect of the invention, and the controller is configured to detect the amount of the laundry detected by the cloth amount detecting means. The larger the number, the lower the second rotational speed.

  With such a configuration, when the amount of fabric is large, the second rotational speed is lowered, so that the laundry quickly sticks to the inner wall of the washing and dehydrating tub and reaches the dehydrating rotational speed early, so that the dehydration time is reduced. It can be shortened. In addition, since the dehydration time can be shortened, energy saving can be improved.

  The 4th invention is equipped with the cloth amount detection means which detects especially the quantity of the said laundry of any one of 1st-3rd invention, The said control part is the said laundry detected by the said cloth amount detection means The larger the amount of, the higher the first rotational speed.

  With such a configuration, even when the amount of cloth is small, the laundry can be accurately attached to the inner wall of the washing and dewatering tub.

  In particular, the fifth invention is a program for causing a computer to execute at least one means in any one of the first to fourth drum type washing machines.

  With such a configuration, since it is a program, a part or all of the washing machine of the present invention can be easily realized using a microcomputer or the like. Further, the program can be easily distributed by recording it on a recording medium or distributing the program using a communication line.

  Hereinafter, a drum type washing machine according to an embodiment of the present invention will be described with reference to the drawings. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a schematic structure of a drum-type washing machine according to Embodiment 1 of the present invention. The configuration will be described below with reference to FIG.

  A water tub 3 is housed in the washing machine body 1 so as to be swingable. A rotating drum 4 serving as a washing tub is disposed in the water tub 3 so as to be rotatable around a rotation shaft 4a. The rotating shaft 4 a of the rotating drum 4 is directly connected to a motor 6 that is a driving means attached to the outside of the back surface of the water tank 3, and the rotating drum 4 is driven to rotate by this motor 6.

The rotating drum 4 is provided with a plurality of through holes 4e over the entire wall surface 4c so that the water tank 3 and the rotating drum 4 can be passed and vented. The back wall 4d of the rotating drum 4 is formed with a plurality of back openings 4f along the circumferential direction, and these back openings 4f are opposed to an air inlet (not shown) formed in the upper part on the back side of the water tank 3. Are arranged to be. A plurality of stirring protrusions 4 b are provided on the inner surface of the wall surface 4 c of the rotating drum 4, and the laundry in the rotating drum 4 is lifted by the rotation of the rotating drum 4. Although the through hole 4e is provided over the entire wall surface 4c of the rotating drum 4, it may be partially formed on the wall surface 4c of the rotating drum 4. In short, the air permeability between the water tank 3 and the rotating drum 4 is essential. In addition, it should be set so that water permeability can be ensured and washing does not hinder drying.

  The rotating shaft 4a of the rotating drum 4 is inclined so as to face downward from the front side toward the back side. Specifically, it is arranged so as to be inclined downward from the horizontal direction X by, for example, an angle θ = 20 ± 10 degrees. By tilting the rotary shaft 4a in this way, the opening 13 on the front side of the aquarium 3 can be arranged on the upper side, and the user can pass through the opening 13 of the aquarium 3 without taking a posture of bending greatly. The laundry in the rotating drum 4 can be taken out. Compared with the case where the rotating shaft 4a is set in the horizontal direction, the water supplied into the water tank 3 accumulates on the back side, and a deep water storage state can be obtained even with a small amount of water. That is, even if the water supply amount is small, the water accumulated in the water tank 3 can enter the through hole 4e of the rotating drum 4 to wet the laundry and detect the water absorption speed. In order to efficiently supply water to the laundry in the rotating drum 4, the water tank 3 is provided along the vicinity thereof with the same inclination as the rotating drum 4. If the amount of water supply is not taken into consideration, the rotating drum 4 may be horizontal or the inclination angle θ may be less than 10 degrees.

  Moreover, the door 5 is provided in the opening part of the front side of the washing machine main body 1 so that opening and closing is possible. The opening 13 of the water tank 3 is fitted with an annular sealing material 14 at its mouth edge, the front surface side of the sealing material 14 comes into contact with the rear surface side of the door 5 and is sealed, and the opening of the water tank 3 that swings up and down, right and left, and back and forth. Even if it moves, the sealing material 14 is deformed and the sealing performance is maintained in such a manner that the sealing material 14 is pressed toward the back side of the door 5.

  In the upper part of the water tank 3, a detergent container 7a and a water supply valve 7b are provided. Water is supplied from the outside of the washing machine by opening and closing the water supply valve 7b. The supplied water is supplied to the space Y formed between the inner surface of the water tank 3 and the outer surface of the rotating drum 4 together with the detergent in the detergent container 7a through the water supply path 7c.

  A drain pipe 8 a having one end connected to the bottom of the water tank 3 and a drain valve 8 b are provided at the lower part of the water tank 3. By opening and closing the drain valve 8b, water in the water tank 3 is drained through the drain pipe 8a when necessary, such as at the end of the washing process or at the end of the rinsing process. Further, a drainage filter 15 that is removable from the outside of the washing machine main body 1 is disposed on the downstream side of the drainage pipe 8a, and collects yarn waste contained in the drainage.

  The drying means 9 collects and removes dust from the outlet 9f that discharges air from the water tank 3 and the rotating drum 4, a blower 9c that sucks air from the outlet 9f, and yarn waste contained in the air from the outlet 9f. A filter (not shown), an inlet 9e that is provided on the back side of the water tank 3 and enters the air blown from the blower 9c into the rotating drum 4, and a blower path 9d that connects the blower 9c and the inlet 9e The dehumidifying part 9g for dehumidifying the high-humidity air from the outlet 9f and the dehumidifying part 9g that is arranged downstream of the dehumidifying part 9g in the air blowing path 9d and heating the dehumidified air at a high temperature It is comprised from the heating part 9h used as air.

  The dehumidifying unit 9g and the heating unit 9h may be configured by a heat pump unit, the heating unit 9h may be configured by a heater, and the dehumidifying unit 9g may be a water cooling method or an air cooling method.

  In addition to the above, the water in the water tank 3 is circulated by the circulation pump 30 as necessary at the time of the washing process, the rinsing process, the dehydration process, etc. to prevent the early dissolution and bias of the detergent and improve the function of washing and rinsing. It also has a function to plan.

A circulation pump 30 as water supply means for directly supplying water to the laundry is fixed on a base plate 2a which is the bottom of the washing machine body 1 as shown in FIG. Water is supplied to the circulation channel 31. In addition, the supplied cleaning water or rinse water is discharged into the rotary drum 4 from the opening 13 of the rotary drum 4 through the circulation water channel 31. In this way, a circulating shower is performed in which the water in the aquarium 3 is used to apply water to the laundry. Specifically, the discharge side path 31 b of the circulation water channel 31 is connected to the discharge port 51 provided on the front end wall 3 f around the opening 13 of the water tank 3 from the outer surface. Washing water or rinsing water is jetted between the inner surface of the front end wall 3f of the water tank 3 and the outer surface of the front end wall 4g of the rotating drum 4 corresponding to the front end wall 3f. 4 is discharged. Thereby, since the discharge port 51 is in a position where it does not come into contact with the laundry in the rotating drum 4, the laundry is not caught and washed, and the behavior necessary for rinsing, rinsing, drying, etc. is not disturbed. Alternatively, it is possible to prevent the laundry from being damaged or torn. Furthermore, the appearance that looks good is not impaired. The motor rotation speed of the circulation pump 30 at this time is set to about 3500 rpm, for example.

  When washing water or rinsing water is simply sprayed into the rotating drum 4, much circulating water can be sprayed only to the local portion of the laundry in the rotating drum 4, and the circulation effect cannot be fully utilized. On the other hand, if a special injection nozzle is used to inject the circulating water over a wide area, the required pump pressure will increase and there will be a cost increase. Therefore, in the present embodiment, in order to circulate the water in the water tank 3 by the circulation pump 30, the flow rate and flow rate of the circulating water to be discharged are adjusted using, for example, a DC brushless motor capable of controlling the rotational speed. Thus, the vertical angle of the circulating water to be discharged and the degree of spread in the horizontal direction can be changed without employing a special injection nozzle. As a result, the circulating pump 30 can supply the circulating water evenly and optimally to the laundry in the rotating drum 4, and the washing performance and the rinsing performance can be improved. Moreover, since it is possible to avoid unnecessary supply of circulating water to the space where the laundry is not located, it is possible to suppress useless power consumption and to suppress abnormal foaming due to the detergent water.

  The rotation speed of the circulation pump 30 is set to, for example, about 3500 rpm during normal washing operation, and about 20 L / min of circulating water is supplied to the laundry in the rotating drum 4 to improve washing performance and rinsing performance. . On the other hand, when it is determined by the load amount detection means that the amount of laundry is less than the predetermined value, the rotational speed of the circulation pump 30 is reduced to, for example, about 2500 rpm, and the circulating water to be supplied is set to about 15 L per minute, The vertical angle at which the circulating water is discharged is made closer to the horizontal, and the degree of spread in the left-right direction is reduced. Thereby, when there is little laundry, the state where the discharged circulating water does not hit the laundry located in the downward direction in the rotating drum 4 can be avoided, and circulating water can be supplied efficiently.

  Further, when the rotational speed of the circulation pump 30 is increased to about 3800 rpm, the discharge angle of the circulating water is maximized upward, and the circulating water reaches the uppermost portion on the near side in the rotating drum directly. In this way, by controlling the rotational speed of the circulation pump 30, the circulating water can be poured onto the laundry lifted to the top of the rotating drum 4. The discharge port 51 is not limited to the lower position, and may be arranged in any position as long as it does not contact the laundry in the rotating drum 4. Therefore, even if the discharge port 51 is provided on the upper part of the rotating drum 4, the circulating water can be applied to the laundry lifted on the upper part of the rotating drum 4.

  In the present embodiment, the circulation pump 30 is installed on the base plate 2a that is the bottom of the washing machine body 1. However, the present invention is not limited to this, and the water in the water tank 3 is circulated. Alternatively, the circulation pump 30 may be installed in the lower part 3 b of the water tank 3.

Further, as an example of the water supply means, a specific example in which the circulation pump 30 is driven and the washing water or the rinsing water is sucked from the lower part of the water tank 3 and discharged to the laundry via the circulation water channel 31 is given. It is not limited to this. In short, it is sufficient that cleaning water or rinsing water can be supplied to the laundry lifted above the rotating shaft 4a of the rotating drum 4. Hereinafter, another example is shown. FIG.
) Is a diagram showing the flow of water during rotation of the drum type washing machine in the first embodiment of the present invention, and FIG. 3B is an example of a circulating shower in the drum type washing machine in the first embodiment of the present invention. FIG. If the rotating drum 4 is rotated at 80 rpm while the washing water is kept at the lower part of the water tank 3 instead of the circulation pump 30, the washing water between the rotating drum 4 and the water tank 3 is indicated by an arrow in FIG. Like A, it winds up along the water tank 3 to the upper part. At the same time, since there is an air gap rather than the frictional pressure between the rotating drum 4 and the water tank 3, the pressure easily escapes, so that the cleaning water is located between the rotating drum 4 and the door 5 in the direction of arrow B, that is, in the front direction. Or rinse water comes up. As shown in FIG. 3 (b), when the washing water or rinsing water squeezed in the front direction is inserted between the rotating drum 4 and the door 5, the circulation component 52 serving as a new circulation path is inserted. Washing water or rinsing water can be discharged to the laundry above the rotating shaft 4a via the circulation part 52.

  Alternatively, the water supply from the water supply valve 7b to the water tank 3 is described as an example in which water is supplied through the water supply path 7c in this embodiment, but the discharge port of the water supply path is provided between the upper part of the door 5 and the rotating drum 4. The cleaning water or the rinsing water may be discharged by supplying water.

  Further, the drum type washing machine according to the present embodiment is provided with a water level detection means 10 for detecting the amount of water supplied into the rotary drum 4. In this case, an air trap part and a pressure detection part arranged at a predetermined position near the lowest part of the water tank 3 are connected by a hose. The pressure detector is composed of a ferrite integrated with the bellows part that moves by pressure and a fixed coil that surrounds the outer periphery of the ferrite, and converts the moving stroke distance into the trap internal pressure using the change in inductance. . The water level detecting means 10 is in an open state when the cleaning water does not enter the air trap part, and the output is constant.

  As described above, the water level detection means 10 is generally sensing by air internal pressure measurement by an air trap mechanism, and measuring the time until the air internal pressure changes from the stable atmospheric open pressure affects the variation of the water level sensor. It is an appropriate calculation method that is not subject to

  The output of the water level detection means 10 changes depending on the rotation speed of the rotary drum 4 because the output changes depending on the rotation of the rotary drum 4 during the washing operation, such as whether or not the rotary drum 4 is rotating. Have multiple tables. That is, the water level can be recognized while the rotating drum 4 is stationary or rotating.

  The vibration detection means 16 has a function of detecting the vibration of the water tank 3 and is composed of an acceleration sensor (not shown). In the present embodiment, for example, vertical vibration (acceleration) is detected with respect to the front surface of the rotating drum 4. The acceleration sensor may be a semiconductor acceleration sensor, a piezoelectric acceleration sensor, or the like, and may be a multi-axis (two-axis or three-axis) acceleration sensor. Since the actual vibration of the water tank 3 is not necessarily limited to one direction, it is preferable to use a sum of three-axis acceleration components added using a three-axis acceleration sensor.

  Next, details of the control device 11 will be described with reference to FIG. FIG. 2 is a block diagram showing the configuration of the drum-type washing machine control device 11 according to Embodiment 1 of the present invention. The control device 11 includes a microcomputer, and includes a control unit 11a and a cloth amount detection unit 11b that detects the cloth amount. The control unit 11a has a function of automatically controlling the motor 6, the water supply valve 7b, the drain valve 8b, the circulation pump 30 and the like and performing at least a washing process, a rinsing process, and a dehydrating process according to mode setting and a control program. Moreover, the control part 11a determines a washing water level according to the cloth amount detected by the cloth amount detection means 11b, and opens the water supply valve 7b. When the water level detection means 10 confirms that the water has been supplied to the cleaning water level, the controller 11a closes the water supply valve 7b and stops the water supply.

  The cloth amount detecting means 11b for detecting the amount of laundry put into the rotating drum 4 is detected by using a rotational speed detecting means 17 for detecting the rotational speed of the rotating drum 4. An example of the cloth amount detection will be described below.

  First, the motor 6 is rotationally driven. At this time, the rotational speed of the rotating drum 4 is increased to a rotational speed at which the laundry is stuck to the inside of the wall surface 4c of the rotating drum 4, for example, about 100 to 140 rpm. After the rotation is maintained for a predetermined time, the energization of the motor 6 is turned off. Thereby, the inertial rotation of the rotating drum 4 is in a state where the motor 6 is rotated. At this time, the inertial rotational force of the rotating drum 4 gradually decreases due to the friction torque, and the rotating drum 4 eventually stops. The time from the stop of energization to the stop of the rotating drum 4 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 addition, the drum type washing machine according to the present embodiment has a system that can manage all input / output control with a timer, including not only instructions for water supply / drainage and driving of the rotating drum 4, but also various sensor outputs such as the water level detection means 10. It is possible to know the time required for each operation and timing.

  The operation of the drum type washing machine configured as described above will be described below.

  FIG. 4 is a time chart at the time of dehydration of the drum type washing machine in the first embodiment of the present invention. When the laundry is put into the rotating drum 4 and the door 5 is closed, the amount of laundry is detected by the cloth amount detection means 11b. The control part 11a opens the water supply valve 7b, and supplies the water according to the quantity of the laundry in the water tank 3. At this time, water is supplied through the detergent container 7 a and the detergent is also supplied into the water tank 3. When the water level detection means 10 detects that water has been supplied to the level corresponding to the amount of laundry, the washing process starts. Based on the output from the vibration detection means 16, the control unit 11a varies the rotational speed of the motor 6 while performing vector control so that the maximum acceleration is applied in a predetermined direction, in this embodiment, the vertical direction. As a result, optimal washing is performed according to the amount and quality of the laundry. The rotational speed of the rotating drum 4 at this time is about 40 to 60 rpm, although it depends on the size of the rotating drum 4 and the amount and quality of the laundry. At this time, the rotating drum repeats forward and reverse rotation. As the rotating drum 4 rotates, the laundry is lifted by the stirring protrusions 4b, and tapping is performed. Moreover, by driving the circulation pump 30, the washing water is positively replaced, and the washing performance is increased.

  When the washing process is completed, a rinsing process including a dehydrating operation is started. The controller 11a operates the drain valve 8b to start discharging the wash water in the water tank 3 to the outside of the machine. Conventionally, the rotating drum 4 is stopped until all the washing water in the water tank 3 is discharged outside the apparatus. However, in the present embodiment, the rotating drum 4 is rotated at the first rotation speed while performing the draining operation. The first number of rotations is a number of rotations such that the laundry is lifted above the rotation shaft 4 a and does not stick to the wall surface of the rotation drum 4. That is, the first rotational speed is slightly faster than 40-60 rpm, which is the rotational speed at which tapping is performed during the cleaning operation.

The first number of rotations is a number of rotations such that the laundry is lifted above the rotation shaft 4 a and does not stick to the wall surface of the rotation drum 4. Specifically, the first rotational speed is a little faster than 40 to 60 rpm, which is the rotational speed at which tapping is performed during the cleaning operation. For example, when the cloth amount detection unit 11b detects that the amount of laundry is 6 to 9 kg, the rotation speed of the rotary drum 4 is set to 80 rpm. When the cloth amount detection means 11b detects that the amount of laundry is 3 to 6 kg, the rotational speed of the rotary drum 4 is set to 78 rpm. When the cloth amount detection means 11b detects that the amount of laundry is 0 to 3 kg, the rotational speed of the rotary drum 4 is set to 76 rpm. As described above, the smaller the amount of laundry, the lower the first rotation speed, so that a uniform operation can be performed regardless of the amount of laundry.

  The controller 11a simultaneously operates the circulation pump 30 while rotating the rotary drum 4. When the draining operation is performed while the rotating drum 4 is rotating, the rotating drum 4 positively sends air to the cleaning water, and the cleaning water is agitated and waved. Therefore, the cleaning water in the water tank 3 is less likely to be discharged outside the apparatus than when the rotary drum 4 is drained while being stationary. For a few minutes from the start of the dehydration operation, the washing water remains at the bottom of the aquarium 3 sufficiently, so that the washing water can be circulated through the discharge port 51 and subjected to a circulating shower using the circulation pump 30. It becomes.

  Further, the position where the circulating shower is put on the laundry is a position above the height of the horizontal axis of the rotating drum 4. FIG. 5 (a) is a diagram showing the behavior of the laundry at the start of dewatering of the conventional drum type washing machine, and FIG. 5 (b) is the start of dewatering of the drum type washing machine in Embodiment 1 of the present invention. It is a figure which shows the behavior of the laundry at the time. Conventionally, as shown in FIG. 5A, when the rotating drum 4 is rotated while maintaining a constant speed of about 80 rpm, water held in the laundry is dehydrated by centrifugal force. The dehydrating effect due to centrifugal force appears when the laundry is lifted to a position above the height of the rotating shaft 4a of the rotating drum 4. When the laundry is lifted to a position above the height of the rotating shaft 4a of the rotating drum 4, the jersey made of chemical fibers with good dehydrating properties will quickly drain the washing water, and the clothes will quickly deform into a flat plate shape. Try this. On the other hand, the cotton-like jeans that are difficult to remove water fall to the lower part of the rotating drum 4 in the form of dumplings.

  As shown in FIG. 5 (b), the washing water is continuously supplied to the laundry by a circulating shower toward the upper position from the height of the rotating shaft 4a of the rotating drum 4 as in the present embodiment. The laundry can be evenly attached to the wall surface 4c of the rotating drum 4 regardless of the cloth quality. In other words, the chemical fiber jersey with good dehydration properties will immediately retain water content in the laundry (water-rich state) because the water content is immediately circulated by the circulating shower even if the wash water comes out at once. be able to. Similarly, since the moisture content of cotton-like laundry that is difficult to drain water is saturated, the laundry maintains the same weight regardless of the fabric quality, and therefore the same centrifugal force is applied. As shown in FIG. 5B, the trajectory from when the laundry is lifted to a position higher than the height of the rotating shaft 4a until it falls to the lower portion of the rotating drum 4 is the cloth quality of clothing, that is, dewatering property. It will be the same regardless of the difference. Therefore, it will be in the very stable rotation state, and will be in the preparation state of the operation | movement which affixes the laundry on the wall surface 4c of the rotating drum 4 from now on.

  An operation for increasing the rotational speed of the rotary drum 4 from this state to the dehydration rotational speed will be described. FIG. 6 is a diagram showing the behavior of the laundry when the rotational speed of the drum type washing machine in Embodiment 1 of the present invention is increased. As described above, in the rotating laundry group in which the rotating drum 4 is stably rotated, it looks as if a small donut-shaped lump is rotating stably. Here, the circulation pump 30 is driven to accelerate the rotation speed of the rotary drum 4 from the first rotation speed, for example, 80 rpm, to the second rotation speed, for example, 120 rpm, while the circulation shower C is applied to the laundry. The second rotational speed is the rotational speed at which the laundry sticks to the wall surface 4 c of the rotating drum 4. As a result, acceleration is quickly applied to the donut-shaped laundry group, and the donut-shaped laundry group is instantly diffused in the outer peripheral direction and is evenly adhered to the wall surface 4c of the rotating drum 4. When the laundry sticks to the wall surface 4c of the rotating drum 4, the driving of the circulation pump 30 is stopped.

Note that the second rotation speed at which the laundry sticks to the wall surface 4c of the rotary drum 4 depends on the amount of the laundry, and therefore the second rotation speed is changed depending on the cloth amount detected by the cloth amount detection means 11b. In the present embodiment, since the rotating drum 4 is rotated while a circulating shower is applied, the sticking rotation speed does not change depending on the cloth quality. Therefore, the second rotational speed is changed according to the cloth amount detected by the cloth amount detecting means 11b. When a predetermined torque is applied to the rotating drum 4, the magnitude of the centrifugal force applied to the laundry differs depending on whether the amount of fabric is large or small. This is because the heavier the mass, the easier the centrifugal force is applied. Therefore, when the amount of laundry is large, centrifugal force is easily applied to the laundry, so the rotational speed of the rotary drum 4 is set low. On the other hand, when the amount of laundry is small, centrifugal force is not easily applied to the laundry, so the rotational speed of the rotary drum 4 is set high. For example, when the cloth amount detection unit 11b detects that the amount of laundry is 0 to 3 kg, the second rotation speed is set to 120 rpm. When the cloth amount detection means 11b detects that the amount of laundry is 3 to 6 kg, the second rotation speed is set to 110 rpm. When the cloth amount detection means 11b detects that the amount of laundry is 6 to 9 kg, the second rotation speed is set to 100 rpm. As described above, the larger the amount of laundry, the lower the second rotational speed, so that the laundry can be reliably attached to the wall surface 4c of the rotating drum 4 regardless of the amount of laundry.

  Thus, before the rotation speed increases to the dehydration rotation speed, a uniform centrifugal force is instantaneously applied to the laundry, and the laundry is evenly attached to the wall surface 4c of the rotating drum 4, thereby suppressing vibration and noise during dehydration. be able to. Further, the dehydration time can be shortened by stopping or reversing the rotating drum 4 in order to eliminate the imbalance. Therefore, dehydration operation with high energy saving is possible.

  Thereafter, the control unit 11a increases the rotation of the rotary drum 4 to 800 rpm which is the dehydration rotation number. At this time, since the driving of the circulation pump has already been stopped, an increase in the number of rotations of the rotating drum 4 is not hindered by the circulation shower. After dehydrating for several minutes at the dehydrating speed, the controller 11a stops the rotation of the rotating drum 4. The controller 11a opens the water supply valve 7b to supply rinse water into the water tank 3. When the water level detection means 10 detects that the rinse water level has been reached, the controller 11a causes the rotating drum 4 to rotate forward and backward (tumbling) at a rotational speed of 40 to 60 rpm. As a result, the laundry is struck from the top of the rotating drum 4 and the detergent components are removed from the laundry. At this time, when the circulation pump 30 is driven, the rinse water is applied to the laundry, and the rinse water is actively replaced. Thereby, the rinsing performance is improved.

  When the stirring operation in the rinsing process is completed, a dehydrating process is performed. The controller 11a opens the drain valve 8b and starts draining. Moreover, the control part 11a raises the rotating drum 4 to the 1st rotation speed. At this time, the circulation pump 30 remains driven. As a result, the laundry is lifted to the upper part of the rotating drum 4 and centrifugal force acts on the laundry. However, by constantly containing water in the circulating shower, the laundry receives a constant centrifugal force regardless of the quality of the laundry. be able to. Therefore, it will be in the very stable rotation state, and will be in the preparation state of the operation | movement which affixes the laundry on the wall surface 4c of the rotating drum 4 from now on.

  The controller 11a accelerates the rotational speed of the rotating drum 4 from the first rotational speed to the second rotational speed, for example, 120 rpm at a stroke. The second rotational speed is the rotational speed at which the laundry sticks to the wall surface 4 c of the rotating drum 4. As a result, acceleration is quickly applied to the donut-shaped laundry group, and the donut-shaped laundry group is instantly diffused in the outer peripheral direction and is evenly adhered to the wall surface 4c of the rotating drum 4.

  Thus, before the rotation speed increases to the dehydration rotation speed, a uniform centrifugal force is instantaneously applied to the laundry, and the laundry is evenly attached to the wall surface 4c of the rotating drum 4, thereby suppressing vibration and noise during dehydration. be able to. Further, since the rotational speed can be increased smoothly without stopping or reversing the rotating drum 4 in order to eliminate imbalance, the dehydration time can be shortened. Therefore, dehydration operation with high energy saving is possible.

Thereafter, the controller 11a increases the rotation of the rotating drum 4 to 800 pm, which is the dehydrating rotation speed. At this time, since the driving of the circulation pump 30 is already stopped, the increase in the number of rotations of the rotary drum 4 is not hindered by the circulation shower. If predetermined time passes, the control part 11a will stop rotation of the rotating drum 4, and a washing operation will be complete | finished. Although the rinsing is performed once in the present embodiment, the rinsing may be performed a plurality of times. Even in such a case, the dehydration time can be shortened by increasing the rotation speed to the second rotation speed while performing a circulating shower at the first rotation speed before rotating the rotating drum to the dehydration rotation speed. it can.

  As described above, according to the present embodiment, an equal centrifugal force is instantaneously applied to the laundry and the laundry is evenly attached to the wall surface 4c of the rotating drum 4 before the rotation speed increases to the dehydration rotation speed. This makes it possible to suppress vibration and noise during dehydration. Further, the dehydration time can be shortened by stopping or reversing the rotating drum 4 in order to eliminate the imbalance. Therefore, dehydration operation with high energy saving is possible.

  The washing machine according to the present invention instantaneously applies an even centrifugal force to each laundry by increasing the number of rotations of the washing and dewatering tank at once while keeping the moisture content of each laundry at a constant speed during low-speed rotation. Accordingly, the laundry can be evenly attached to the wall surface of the washing / dehydrating tub, and as a result, vibration and noise during dehydration can be suppressed and dewatering performance can be improved. Moreover, energy saving property can be improved.

  Similarly, the present invention can be applied to applications such as improving the washing performance by changing the rotation speed by changing the viscosity of washing water, such as nozzle rotation control of a dishwasher.

DESCRIPTION OF SYMBOLS 1 Washing machine main body 2a Base plate 3 Water tank 3f Front end wall 4 Rotating drum (washing and dewatering tank)
4a Rotating shaft 4b Stirring protrusion 4c Wall surface 4e Through hole 4g Front end wall 5 Door 6 Motor (drive means)
7a Detergent storage part 7b Water supply valve 8b Drain valve 10 Water level detection means 11 Control device 11a Control part 11b Cloth amount detection means 13 Opening 15 Drain filter 16 Vibration detection means 17 Rotation speed detection means 30 Circulation pump (water supply means)
31 Circulating water channel 51 Discharge port

Claims (5)

A laundry and dewatering tub having a plurality of holes that can be rotated around a horizontal rotation axis or a rotation axis inclined downward from the front side toward the back side, containing laundry
A water tank containing the washing and dewatering tank;
Water supply means for directly supplying water to the laundry;
Driving means for driving the washing and dewatering tub;
A controller for controlling the driving means to perform a dehydrating operation,
When the dehydration is started, the control unit is configured such that the laundry is lifted above the rotation shaft and does not stick to the wall surface of the washing / dehydrating tub, and the laundry is the inner wall of the washing / dehydrating tub. Driving the driving means so as to have a second rotational speed that sticks to
While the washing and dewatering tub is being driven at the first rotation speed, the water supply means supplies water to the laundry located above the rotation shaft and changes to the second rotation speed. A drum-type washing machine designed to be used. The control unit starts the dehydration operation in a state where there is water in the water tank,
2. The drum type washing machine according to claim 1, wherein the water supply unit sucks water accumulated in a bottom portion of the water tank and discharges the water to the laundry in the washing and dewatering tank. A cloth amount detecting means for detecting the amount of the laundry,
3. The drum type washing machine according to claim 1, wherein the controller is configured to decrease the second rotational speed as the amount of the laundry detected by the cloth amount detection unit increases. A cloth amount detecting means for detecting the amount of the laundry,
The drum-type laundry according to any one of claims 1 to 3, wherein the control unit decreases the first rotational speed as the amount of the laundry detected by the cloth amount detection unit decreases. Machine. The program for making a computer perform at least 1 means in the drum type washing machine of any one of Claims 1-4.