EP2692930A1 - Trommelwaschmaschine - Google Patents

Trommelwaschmaschine Download PDF

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Publication number
EP2692930A1
EP2692930A1 EP12765324.4A EP12765324A EP2692930A1 EP 2692930 A1 EP2692930 A1 EP 2692930A1 EP 12765324 A EP12765324 A EP 12765324A EP 2692930 A1 EP2692930 A1 EP 2692930A1
Authority
EP
European Patent Office
Prior art keywords
water
rotary drum
rotation speed
laundry
washing machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12765324.4A
Other languages
English (en)
French (fr)
Other versions
EP2692930A4 (de
Inventor
Hiroto Nakama
Wataru Uchiyama
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Corp
Original Assignee
Panasonic Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2692930A1 publication Critical patent/EP2692930A1/de
Publication of EP2692930A4 publication Critical patent/EP2692930A4/de
Withdrawn legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F33/00—Control of operations performed in washing machines or washer-dryers 
    • D06F33/30—Control of washing machines characterised by the purpose or target of the control 
    • D06F33/32—Control of operational steps, e.g. optimisation or improvement of operational steps depending on the condition of the laundry
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/18—Washing liquid level
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
    • D06F2103/24—Spin speed; Drum movements
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/06—Recirculation of washing liquids, e.g. by pumps or diverting valves
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F2105/00—Systems or parameters controlled or affected by the control systems of washing machines, washer-dryers or laundry dryers
    • D06F2105/08—Draining of washing liquids
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
    • D06F39/00—Details of washing machines not specific to a single type of machines covered by groups D06F9/00 - D06F27/00 
    • D06F39/08—Liquid supply or discharge arrangements
    • D06F39/083—Liquid discharge or recirculation arrangements

Definitions

  • the present invention relates to a front-loading-type washing machine which performs washing by sequentially controlling each step of washing, rinsing, spin-drying and the like.
  • a front-loading-type washing machine which makes an early start of a spin-drying step by rotating a rotary drum during drainage so as to shorten a washing time (for example, see PTL 1).
  • the front-loading-type washing machine of the related art disclosed in PTL 1 performs an agitation operation in a washing step for a predetermined time and then, starts a drainage operation.
  • a drain pump is driven and water in a water tub is drained.
  • the rotary drum is stopped at the latest when the driving condition is detected.
  • the stopped rotary drum is rotated at a low speed and an early start of a spin-drying step is made.
  • the rotary drum is stopped until the input signal reaches the driving condition from the drainage start. That is, the rotation of the rotary drum is started after the input signal reaches the driving condition. Accordingly, while a washing time can be shortened, there has been a problem that rinsing is started in a state where a water level in the water tub is lowered and therefore, rinsing performance is not sufficient.
  • a front-loading-type washing machine includes: a rotary drum which accommodates laundry; a water tub which rotatably supports the rotary drum; a motor which drives the rotary drum in a rotary manner; a water supply valve which supplies water to the water tub; a drainage section which drains water from the water tub; and a control unit having a controller which controls at least washing, rinsing and spin-drying steps, in which the controller performs control in such a manner that during the rinsing step, after the rotary drum is rotated in a predetermined direction, water is drained by the drainage section, and at least during the drainage, a rotation speed of the rotary drum becomes a rotation speed at which the laundry adheres to an inner circumferential wall of the rotary drum.
  • Fig. 1 is a cross-sectional view of the front-loading-type washing machine according to the first embodiment of the present invention.
  • the front-loading-type washing machine includes at least rotary drum 4, water tub 3, motor 6, water supply valve 7b, drain valve 8b which is a drainage section, and control unit 11.
  • Water tub 3 is swingably provided in main body 1 and rotary drum 4 is rotatably provided in water tub 3.
  • Rotary drum 4 is driven in a rotary manner around rotary axis 4a in normal or reverse rotation direction by motor 6 which is attached to the outside of the rear side of water tub 3.
  • agitating protrusions 4b which agitate laundry such as clothes and plural through holes 4e which communicate with the inside of water tub 3 are provided.
  • rear wall 4d that is the bottom of rotary drum 4
  • plural rear openings 4g are formed in a circumferential direction. Rear openings 4g are provided so as to face air inlet 18 formed on the upper side of the rear side of water tub 3.
  • water tub 3 is provided in main body 1 with the same inclination as rotary drum 4. Therefore, in comparison with a case where rotary axis 4a is horizontal, the water supplied to water tub 3 is collected in the rear side, and a deep water storage state can be obtained even with a small amount of water. As a result, because favorable contact with laundry is made even with a small amount of water, it is possible to heighten a rinsing effect. Accordingly, during the drainage, even when a water level in rotary drum 4 is lowered, the water penetrates into the laundry for a long time to improve rinsing performance in comparison with the case where rotary axis 4a is horizontal. When there is no need to consider the amount of water supplied, rotary axis 4a may be horizontal or may have an inclination angle ⁇ of less than 5 degrees. Therefore, the degree of freedom in design for the front-loading-type washing machine is improved.
  • door 5 which faces opening 13 of water tub 3 and can be freely opened or closed, is provided and a user can put laundry such as clothes in rotary drum 4 through door 5.
  • circular sealing material 14 having elastic force is mounted. Even when water tub 3 vibrates right to left, up and down or back and forth, sealing material 14 is deformed to press the rear side of door 5, and therefore, sealability between water tub 3 and door 5 is maintained.
  • Water supply unit 7 which supplies water to water tub 3 is provided.
  • Water supply unit 7 includes water supply valve 7b, detergent container 7a to which water is supplied by opening or closing water supply valve 7b and water supply path 7c which supplies detergent in detergent container 7a and water to water tub 3.
  • Drain unit 8 which drains water from water tub 3 is provided.
  • Drain unit 8 includes drain pipe 8a of which one end is connected with the lowest part of water tub 3 and drain valve 8b. Drain valve 8b is opened to drain the water in water tub 3 through drain pipe 8a when needed, such as after a washing step is ended or when a rinsing step is ended, and closed to stop water drainage.
  • drain filter 8c On the downstream side of drain pipe 8a, drain filter 8c which is detachable from the outside of main body 1 is provided. Drain filter 8c collects lint included in water drainage.
  • drying unit 9 On the lower side of the rear side of water tub 3, drying unit 9 is provided. Drying unit 9 has blower 9c, circulating path 9d, inlet 9e, outlet 9f, dehumidifier 9g and heater 9h.
  • Blower 9c suctions air from outlet 9f which expels air from water tub 3 and rotary drum 4.
  • Inlet 9e is provided on the rear side of water tub 3 and sends the suctioned air by blower 9c into rotary drum 4.
  • the highly humid air from outlet 9f is dehumidified by dehumidifier 9g.
  • the dehumidified air is heated by heater 9h provided on the lower side from dehumidifier 9g to become high-temperature air.
  • Dehumidifier 9g and heater 9h are provided in circulating path 9d which connects blower 9c and inlet 9e.
  • Dehumidifier 9g and heater 9h may be configured by a heat pump unit, or heater 9h may be configured by a heater and dehumidifier 9g may be configured by a water-cooling type or air-cooling type dehumidifier system.
  • Circulation pump 30 is fixed to base plate 1a that is the bottom of main body 1, and suctions the water in water tub 3 to supply the water to circulating water path 31 through circulating water ejection pipe 32.
  • the supplied water is ejected into rotary drum 4 from opening 15 of rotary drum 4 through circulating water path 31.
  • circulating water ejection pipe 32 of circulating water path 31 is connected to ejection port 51 provided on front end wall 3f which is on the circumferential edge in the end of opening 13 of water tub 3 from the side of door 5.
  • ejection port 51 provided on front end wall 3f which is on the circumferential edge in the end of opening 13 of water tub 3 from the side of door 5.
  • the water is ejected into rotary drum 4 through a flow path formed between the back surface of front end wall 3f of water tub 3 and the front surface of front end wall 4f of rotary drum 4 corresponding to the back surface of front end wall 3f.
  • the water in water tub 3 is circulated so as to prevent the detergent from being dissolved early and the laundry from being biased and improve washing and rinsing performance.
  • Ejection port 51 for the water from circulating water ejection pipe 32 is provided at a position in which the ejection port is not brought into contact with the laundry in rotary drum 4. Therefore, it is possible to prevent the laundry from being caught and disturbing the operation or being damaged during the washing, rinsing and drying steps.
  • the flow volume and the flow rate of water to be ejected are adjusted. Accordingly, the water can be supplied to a wide area and at the optimal position of the laundry in water tub 3 by circulation pump 30 without providing a special nozzle. As a result, washing performance and rinsing performance are improved. In addition, because the water is not wastefully supplied to a space where the laundry is not placed, wasteful electric power consumption can be suppressed and abnormal foam generation due to water containing detergent can be suppressed.
  • a cloth amount detector (not shown) which detects the amount of the laundry put in rotary drum 4 is provided in main body 1.
  • motor 6 is driven in a rotary manner.
  • the rotation speed of rotary drum 4 is increased to the extent that the laundry adheres to inner circumferential wall 4c of rotary drum 4, for example, 100 rpm to 140 rpm.
  • Rotary drum 4 is continuously rotated at the aforementioned rotation speed for a predetermined time and then, motor 6 is turned off.
  • rotary drum 4 is continuously rotated due to the inertia of rotary drum 4. Accordingly, motor 6 of rotary drum 4 is rotated.
  • the rotation of rotary drum 4 is stopped by resistance such as friction.
  • the time from the stop of electric power to the stop of rotary drum 4 is lengthened when the amount of laundry is large and shortened when the amount of laundry is small.
  • the difference in time required for stopping rotary drum 4 is proportional to the amount of laundry, the amount of laundry is detected.
  • water level detector 10 which detects the amount of water supplied to rotary drum 4 is provided.
  • Water level detector 10 is configured in such a manner that air trap 10a provided at a predetermined position near lower part 3b of rotary drum 4 is brought into contact with a pressure detector (not shown) through hose 10b.
  • the pressure detector includes, for example, a ferrite alloy integrated with a bellows part that moves due to pressure and a coil on the fixing side which surrounds the upper part of the outer circumference of the ferrite. Then, using a change in inductance between the ferrite and the coil, a moving stroke distance is converted to a pressure inside air trap 10a. Water level detector 10 is exposed to the atmosphere when there is no water in air trap 10a, and the output from the pressure detector is constant.
  • water level detector 10 generally performs sensing by measuring the pressure inside air trap 10a using an air trap mechanism and can properly calculate the water level in water tub 3 without influence on the variation of a water level sensor by measuring the time until the pressure inside air trap 10a is changed to a stable atmosphere release pressure.
  • control unit 11 which will be described later, has plural frequencies corresponding to the rotation speed of rotary drum 4 and a water level table. That is, even when rotary drum 4 is stopped or being rotated, the water level can be detected.
  • rotation speed detector 21 which detects the rotation speed of rotary drum 4 and control unit 11 are provided.
  • control unit 11 in the front-loading-type washing machine will be described below using Fig. 2 .
  • Fig. 2 is a block diagram describing a control circuit in front-loading-type washing machine according to the embodiment.
  • control unit 11 includes at least, controller 11a, for example, having a microprocessor and the like, input setting section 11b, display 11c, storage section 11e and time measuring section 11f.
  • controller 11a of control unit 11 displays the method on display 11c.
  • Controller 11a of control unit 11 automatically controls motor 6, drain valve 8b, circulation pump 30 and water supply valve 7b through power switching section 11d according to an input mode setting and a control program stored in storage section 11e. Accordingly, control unit 11 controls a series of washing, rinsing, spin-drying steps.
  • Controller 11a supplies water, drains water or drives rotary drum 4 based on signals from time measuring section 11f which measures time, water level detector 10 and rotation speed detector 21.
  • time measuring section 11f which measures time, water level detector 10 and rotation speed detector 21.
  • drainage and spin-drying In order to differentiate a drainage and spin-drying operation during a rinsing step and a drainage and spin-drying operation during a spin-drying step, drainage and spin-drying during a rinsing step is described as an intermediate drainage and spin-drying operation, and drainage and spin-drying during a spin-drying step is described as a final drainage and spin-drying operation.
  • door 5 is opened and laundry such as clothes is put in rotary drum 4 from opening 13 of water tub 3.
  • a start switch (not shown) is manipulated to start operation, the amount of the laundry is detected by means of cloth amount detection with the rotation of rotary drum 4.
  • Water supply valve 7b is opened and water, of the amount of water set in advance according to the detected amount of the laundry, is supplied to water tub 3. At this time, the detergent accommodated in detergent container 7a is introduced into water tub 3 by using the water supply.
  • controller 11a When the water level of water tub 3 is a predetermined level or more, controller 11a operates circulation pump 30 to accelerate the dissolution of the detergent. In addition, controller 11a controls motor 6 to drive rotary drum 4 in a rotary manner. Accordingly, an agitation operation, so-called tumbling, that the laundry in rotary drum 4 is lifted up in a rotation direction by agitating protrusions 4b and falls from the upper side of rotary drum 4 on the water surface of the water in which the detergent is dissolved due to the laundry's own weight, is repeatedly performed.
  • controller 11a opens drain valve 8b through power switching section 11d, and discharges the contaminated water in water tub 3 from drain pipe 8a, and the washing step is ended.
  • Fig. 3 is a time chart showing operations of a rinsing step and a spin-drying step of the front-loading-type washing machine according to the first embodiment of the present invention.
  • each operation of intermediate spin-drying, which mainly performs spin-drying, and water supply and agitation, which mainly performs rinsing, is sequentially performed.
  • controller 11a starts a balance controlling process for reducing vibration that is generated by the laundry in rotary drum 4 when rotary drum 4 is rotated at a high speed.
  • the balance controlling process is usually performed, for example, by rotating rotary drum 4 at a rotation speed of 50 rpm, and generally, for example, by detecting the vibration of rotary drum 4 using an vibration detection sensor (not shown) such as an acceleration sensor or the like.
  • controller 11a increases the rotation speed of rotary drum 4 to, for example, a predetermined rotation speed of about 900 rpm, and the water is removed from the laundry due to centrifugal force. After the rotation speed reaches the predetermined rotation speed, the rotation speed of rotary drum 4 is maintained during a predetermined time t1. Then, the driving of motor 6 is stopped. When the rotation of rotary drum 4 is stopped, the intermediate spin-drying operation is ended, and the operation is shifted to the next water supply and agitation. At this time, the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • controller 11a opens water supply valve 7b while rotating rotary drum 4 in a predetermined direction and collects water in water tub 3.
  • the rotation speed of rotary drum 4 is about 80 rpm, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • controller 11a controls water supply valve 7b to stop the water supply and turns on circulation pump 30. Accordingly, the water is ejected from ejection port 51 to the laundry in rotary drum 4. At this time, the rotation speed of rotary drum 4 is increased from 80 rpm, for example, to about 170 rpm to remove lint of the laundry by drain filter 8c.
  • controller 11a reduces the rotation speed of motor 6.
  • Controller 11a performs the tumbling operation in which the laundry in rotary drum 4 is agitated, water supply to water tub 3 is started and the operation of circulation pump 30 is stopped.
  • the rotation direction of rotary drum 4 may be forward-reversal rotation or may be rotation in a predetermined direction. Therefore, the laundry is detached from inner circumferential wall 4c of rotary drum 4, agitated in the water collected in water tub 3 and rinsed.
  • controller 11a controls water supply valve 7b to stop water supply.
  • controller 11a stops the operation of rotary drum 4.
  • the predetermined time t2 is set to be longer than the predetermined time t1 in which rotary drum 4 is rotated at a high rotation speed to have sufficient rinsing performance during the intermediate spin-drying in the first rinsing step. Therefore, the water supply and agitation is ended, and the first rinsing step is ended. Then, the operation is shifted to a second rinsing step which is the next step.
  • each operation of intermediate drainage and spin-drying, which mainly performs spin-drying, and water supply and agitation, which mainly performs rinsing, is sequentially performed.
  • controller 11a rotates rotary drum 4 in a predetermined direction.
  • the rotation direction may be the same as or reverse to the rotation direction of the water supply and agitation operation in the first rinsing step.
  • rotary drum 4 is rotated in a predetermined direction at a rotation speed of, for example, 80 rpm, which is a first rotation speed, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4 during the drainage.
  • the rotation speed of rotary drum 4 may be, for example, 50 rpm to 120 rpm, which is a rotation speed at which the laundry adheres to inner circumferential wall 4c of rotary drum 4, and a rotation speed, for example, in a range of 80 rpm to 100 rpm is preferable.
  • the rotation speed of rotary drum 4 may not be constant and may be increased to a predetermined rotation speed in a stepwise or proportional manner.
  • controller 11a controls drain valve 8b to start drainage of the water in water tub 3. Accordingly, the water level of the water in water tub 3 is gradually lowered.
  • controller 11a increases the rotation speed of rotary drum 4 to a second rotation speed of, for example, about 500 rpm based on the signal from water level detector 10.
  • the laundry in rotary drum 4 is rotated in a state where the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • the time t3 which is the first predetermined time is the time until rotary drum 4 has a predetermined rotation speed in a predetermined direction.
  • the first rotation speed of rotary drum 4 is lower than the second rotation speed in the intermediate spin-drying during the first rinsing step. That is, the rotation speed of rotary drum 4 is reduced so that water in the laundry is prevented from being completely removed. As a result, rinsing performance can be maintained without reducing centrifugal force due to the weight of the laundry containing water.
  • controller 11a starts driving of circulation pump 30 before drainage of the water in water tub 3 is started during the rotation of rotary drum 4.
  • controller 11a starts driving of circulation pump 30.
  • the water which has passed through circulating water path 31 from water tub 3 is ejected from ejection port 51 to the laundry in rotary drum 4 by circulation pump 30. At this time, the laundry absorbs the ejected water and also, water is removed due to centrifugal force by the rotation of rotary drum 4. The laundry is repeatedly subjected to water absorption and spin-drying.
  • the replacement of water with respect to the laundry is promoted and a detergent component in the laundry is dissolved in the water around the laundry.
  • a detergent component remaining in the laundry, such as foam or the like, can be effectively removed. Therefore, the detergent component remaining in the laundry is decreased in a short period of time.
  • controller 11a stops the driving of circulation pump 30.
  • the predetermined water level h3 is a water level to the extent that circulation pump 30 does not cause air entrainment. Accordingly, the air entrainment of circulation pump 30 is prevented, and the water in water tub 3 can be effectively circulated through circulating water ejection pipe 32.
  • controller 11a stops the rotation of rotary drum 4.
  • the intermediate drainage and spin-drying operation is ended, and the operation proceeds to the water supply and agitation operation in the next second rinsing step.
  • controller 11a opens water supply valve 7b to collect water in water tub 3 and starts a tumbling operation which agitates rotary drum 4.
  • controller 11a controls water supply valve 7b to stop the water supply and starts driving of circulation pump 30 at the same time.
  • controller 11a stops the operations of rotary drum 4 and circulation pump 30 in order to end the water supply and agitation operation. Therefore, the second rinsing step is ended, and the operation is shifted to the final drainage and spin-drying in the next spin-drying step.
  • controller 11a rotates rotary drum 4 in a predetermined direction.
  • the rotation direction may be the same as or reverse to the rotation direction of the water supply and agitation operation in the first and second rinsing steps.
  • rotary drum 4 is rotated in a predetermined direction at a rotation speed of, for example, 80 rpm, which is a predetermined rotation speed, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4 during the drainage.
  • the rotation speed of rotary drum 4 may be, for example, 50 rpm to 120 rpm, which is a rotation speed at which the laundry adheres to inner circumferential wall 4c of rotary drum 4, and a rotation speed, for example, in a range of 80 rpm to 100 rpm is preferable.
  • the rotation speed of rotary drum 4 may not be constant and may be increased to a predetermined rotation speed in a stepwise or proportional manner.
  • controller 11a controls drain valve 8b to start drainage of the water in water tub 3. Accordingly, the water level of the water in water tub 3 is gradually lowered.
  • controller 11a increases the rotation speed of rotary drum 4 to a high rotation speed of, for example, about 900 rpm based on the signal from water level detector 10. At this time, the laundry in rotary drum 4 is rotated in a state where the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • Controller 11a starts driving of circulation pump 30 before drainage of the water in water tub 3 is started during the rotation of rotary drum 4 in a predetermined direction.
  • controller 11a starts driving of circulation pump 30.
  • the water which has passed through circulating water path 31 from water tub 3 is ejected from ejection port 51 to the laundry in rotary drum 4 by circulation pump 30.
  • the laundry absorbs water by means of the ejected water.
  • water is removed due to centrifugal force by the rotation of rotary drum 4.
  • the laundry is repeatedly subjected to water absorption and spin-drying.
  • the replacement of water with respect to the laundry is promoted and a detergent component in the laundry is dissolved in the water present around the laundry. A detergent component remaining in the laundry can be effectively removed. Therefore, the detergent component remaining in the laundry is decreased in a short period of time.
  • controller 11a stops the driving of circulation pump 30. Accordingly, while the water level falls to the predetermined water level h5 from the predetermined water level h4, the water from circulating water path 31 can be ejected to the laundry in rotary drum 4. Thus, an amount of water absorption of the laundry is increased without increasing the amount of water supplied and an amount of the detergent component remaining in the laundry can be reduced.
  • the predetermined water level h5 is a water level to the extent that circulation pump 30 does not cause air entrainment. Accordingly, the air entrainment of circulation pump 30 is prevented and the water in water tub 3 can be effectively circulated through circulating water ejection pipe 32.
  • controller 11a stops the rotation of rotary drum 4.
  • the intermediate drainage and spin-drying operation is ended, and the spin-drying step is ended.
  • the time until the drainage is started can be fixed. Therefore, the time of starting the drainage is properly controlled to shorten time and obtain a stable cleaning effect.
  • a time point when the rotation of rotary drum 4 is started in a predetermined direction is set as a reference to set an ejection start time of water which is circulated in circulating water path 31 to be ejected. Therefore, the time of starting the circulation of water is properly controlled to obtain a high cleaning effect.
  • Controller 11a may perform control in such a manner that circulation pump 30 is activated after the rotation speed of rotary drum 4 reaches a predetermined rotation speed. The details will be described in the following second embodiment.
  • Fig. 4 is a time chart showing operations of a rinsing step and a spin-drying step of a front-loading-type washing machine according to a second embodiment of the present invention.
  • intermediate drainage and spin-drying in a second rinsing step and final drainage and spin-drying in a spin-drying step are different from those in the first embodiment.
  • Other configurations and operations are the same as in the first embodiment, the same reference numerals are attached to the same components, and as a detailed description, the detailed description of the first embodiment is used.
  • controller 11a rotates rotary drum 4 in a predetermined direction.
  • the rotation direction may be the same as or reverse to the rotation direction of the water supply and agitation operation in the first rinsing step.
  • Rotary drum 4 is rotated in a predetermined direction at a predetermined rotation speed of, for example, 80 rpm, which is a first rotation speed, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4 during the drainage.
  • the rotation speed of rotary drum 4 may be, for example, 50 rpm to 120 rpm, which is a rotation speed at which the laundry adheres to inner circumferential wall 4c of rotary drum 4, and a rotation speed, for example, in a range of 80 rpm to 100 rpm is preferable.
  • the rotation speed of rotary drum 4 may not be constant and may be increased to a predetermined rotation speed in a stepwise or proportional manner.
  • controller 11a starts driving of circulation pump 30. Accordingly, in a state where the rotation speed of rotary drum 4 is constant, water can be stably ejected to the laundry through circulating water path 31 in rotary drum 4. As a result, rinsing performance of the laundry is improved.
  • controller 11a controls drain valve 8b to start drainage of the water in water tub 3. Accordingly, the water level of the water in water tub 3 is gradually lowered.
  • controller 11a increases the rotation speed of rotary drum 4 to a high rotation speed, which is a second rotation speed of, for example, about 500 rpm based on the signal from water level detector 10. At this time, the laundry in rotary drum 4 is rotated in a state where the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • the first rotation speed of rotary drum 4 is lower than the second rotation speed in the intermediate spin-drying during the first rinsing step which has been described in the first embodiment. That is, the rotation speed of rotary drum 4 is reduced so that water in the laundry is prevented from being completely removed. As a result, rinsing performance can be maintained without reducing centrifugal force due to the weight of the laundry containing water.
  • controller 11a stops driving of circulation pump 30. Then, after the rotation speed of rotary drum 4 reaches the first rotation speed, the operation can be shifted to the next operation. As a result, a reduction in rinsing performance of the laundry due to centrifugal force does not occur.
  • controller 11a stops the operation of rotary drum 4. Then, the intermediate drainage and spin-drying step is ended by stopping the rotation of rotary drum 4, and the operation proceeds to the next operation of water supply and agitation.
  • controller 11a opens water supply valve 7b to collect water in water tub 3 and starts a tumbling operation which agitates rotary drum 4.
  • controller 11a controls water supply valve 7b to stop the water supply.
  • controller 11a starts driving of circulation pump 30.
  • the water is collected in water tub 3 to the water level h14 and the tumbling operation is performed. Accordingly, a detergent component is dissolved out from the laundry in water tub 3 so that rinsing performance is improved.
  • controller 11a stops the operation of rotary drum 4 and circulation pump 30 to end the water supply and agitation. Therefore, the second rinsing step is ended and the operation is shifted to final drainage and spin-drying in the next spin-drying step.
  • controller 11a rotates rotary drum 4 in a predetermined direction at a predetermined rotation speed of, for example 80 rpm, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • the rotary drum rotates in a predetermined direction.
  • the rotation direction may be the same as or reverse to the rotation direction of the water supply and agitation in the first and second rinsing steps.
  • the rotation speed of rotary drum 4 may be a rotation speed of, for example, 50 rpm to 120 rpm, at which the laundry adheres to inner circumferential wall 4c of rotary drum 4, and a rotation speed, for example, in a range of 80 rpm, to 100 rpm is preferable. Then, the rotation speed of rotary drum 4 may not be constant and may be increased to a predetermined rotation speed in a stepwise or proportional manner.
  • controller 11a starts driving of circulation pump 30.
  • controller 11a controls drain valve 8b to start drainage of the water in water tub 3. Accordingly, the water level in water tub 3 is gradually lowered.
  • controller 11a increases the rotation speed of rotary drum 4 to for example, about 900 rpm based on the signal from water level detector 10. At this time, the laundry in rotary drum 4 is rotated in a state where the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • controller 11a stops circulation pump 30.
  • controller 11a stops the operation of rotary drum 4.
  • the final drainage and spin-drying step is ended by stopping the rotation of rotary drum 4, and the spin-drying step is ended.
  • rotary drum 4 is rotated in a predetermined direction before the drainage is started. After the rotation speed of rotary drum 4 has reached a predetermined rotation speed, driving of circulation pump 30 is started. Therefore, in a state where the rotation of rotary drum 4 is stable, the water in water tub 3 can be circulated, and thus, rinsing performance is further improved.
  • through holes 4e are preferably provided over entire inner circumferential wall 4c of rotary drum 4, but the embodiment is not limited thereto.
  • the through holes may be formed partially on inner circumferential wall 4c of rotary drum 4, and the arrangement thereof is not particularly limited as long as the inside of water tub 3 communicates with the inside of rotary drum 4.
  • water supply unit 7 is provided on the upper side of water tub 3
  • the water supply unit may be provided on the rear side, lateral side or bottom side of water tub 3 as long as the water can be supplied to water tub 3 and rotary drum 4.
  • drain valve 8b is used as a drainage section
  • the drainage section may include, for example, a drain pump and perform drainage of the water in water tubs 3 using the drain pump.
  • circulation pump 30 may be provided on lower part 3b of water tub 3 to circulate the water in water tub 3.
  • ejection port 51 may be provided not only in the lower part but also the upper part as long as the ejection port has a position with which the laundry in rotary drum 4 is not brought into contact, and plural ejection ports may be provided.
  • the rotation speed of circulation pump 30 may be controlled by changing the rotation speed in each step or according to an amount of laundry, as described below.
  • circulation pump 30 operates at a rotation speed of, for example, about 3500 rpm and supplies about 20L water per minute to the laundry in water tub 3 so as to improve washing performance and rinsing performance. At this time, water is ejected from ejection port 51 in a direction of the arrow A in Fig. 1 .
  • the rotation speed of circulation pump 30 is reduced to, for example, about 2500 rpm, and the circulating water to be supplied is set to about 15L per minute.
  • the rotation speed of rotary drum 4 is not particularly limited and a setting can be arbitrarily changed according to an amount of laundry or a degree of contamination.
  • circulation pump 30 in relation to the ON and OFF control of circulation pump 30, circulation pump 30 is kept turned on during the rinsing step after circulation pump 30 is turned on, but the on period is not particularly limited, and ON and OFF control may be performed as necessary.
  • the front-loading-type washing machine has been described as an example, but the embodiment is not limited thereto.
  • the same effect can be obtained from a pulsator agitation type or agitator type vertical washing machine (top-loading-type washing machine).
  • top-loading-type washing machine in order for water to penetrate uniformly, laundry may become wet uniformly from the outer circumferential side of the laundry using a shower provided outside the rotary drum.
  • the agitating blade and the rotary drum may integrally behave and thus, the laundry may absorb water or the water may be removed from the laundry by making the laundry adhere to the rotary drum.
  • rotary drum 4 is rotated in a predetermined direction before the drainage is started.
  • controller 11a drives drain valve 8b to drain water and at least during the drainage, performs control in such a manner that the rotation speed of rotary drum 4 becomes a rotation speed at which the laundry adheres to inner circumferential wall 4c of rotary drum 4.
  • the detergent component included in the laundry is removed from the laundry due to the centrifugal force by the increase of the rotation speed of rotary drum 4.
  • the spin-drying due to the centrifugal force and the driving of circulation pump 30 the ejected water is absorbed again into the laundry and the removed water is replenished.
  • the detergent component in the laundry is effectively removed and thus, rinsing performance of the laundry is improved.
  • the water because water is removed during water absorption, the water does not need to be repeatedly supplied to or drained from water tub 3. Accordingly, it is possible to increase a total amount of water absorption of the laundry without increasing an amount of water supplied, and water saving properties of the front-loading-type washing machine are improved. While the moisture in the laundry is maintained at a certain degree, the water is removed, and therefore, rotary drum 4 can be rotated with a stable centrifugal force.
  • rinsing performance can be improved by repeatedly subjecting water absorption from rinsing water during the drainage and spin-drying by the rotation of the rotary drum to the laundry to make the detergent component dissolve out from the laundry. Therefore, the present invention can be also applied to a cleaning apparatus for fiber and the like and an industrial cleaning machine mainly used for washing with water, as well as a household washing machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
EP12765324.4A 2011-03-29 2012-03-13 Trommelwaschmaschine Withdrawn EP2692930A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2011071618A JP2012205625A (ja) 2011-03-29 2011-03-29 ドラム式洗濯機
PCT/JP2012/001716 WO2012132272A1 (ja) 2011-03-29 2012-03-13 ドラム式洗濯機

Publications (2)

Publication Number Publication Date
EP2692930A1 true EP2692930A1 (de) 2014-02-05
EP2692930A4 EP2692930A4 (de) 2015-04-15

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EP12765324.4A Withdrawn EP2692930A4 (de) 2011-03-29 2012-03-13 Trommelwaschmaschine

Country Status (4)

Country Link
EP (1) EP2692930A4 (de)
JP (1) JP2012205625A (de)
CN (1) CN103459701A (de)
WO (1) WO2012132272A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730690A1 (de) * 2012-11-13 2014-05-14 Panasonic Corporation Trommelwaschmaschine
CN108342877A (zh) * 2017-01-23 2018-07-31 Bsh家用电器有限公司 具有控制装置的洗涤物护理器具
EP3239381A4 (de) * 2014-12-26 2018-08-22 Haier Asia Co., Ltd Waschmaschine
US10619282B2 (en) 2013-09-05 2020-04-14 Samsung Electronics Co., Ltd. Washing machine and control method for same
EP4095307A1 (de) * 2021-05-28 2022-11-30 BSH Hausgeräte GmbH Wäschepflegegerät mit einer steuerung

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WO2014161579A1 (en) * 2013-04-04 2014-10-09 Arcelik Anonim Sirketi Improved efficiency wash cycle for washing machine
US11326292B2 (en) 2016-02-01 2022-05-10 Lg Electronics Inc. Drum washing machine and method for cleaning tub thereof
AU2017214013B2 (en) * 2016-02-01 2019-07-04 Lg Electronics Inc. Drum washing machine and method for cleaning tub thereof
CN110387717B (zh) * 2018-04-17 2023-07-21 松下知识产权经营株式会社 家用电器装置
KR102539459B1 (ko) * 2018-07-06 2023-06-01 엘지전자 주식회사 세탁물 처리기기 및 그 제어방법
KR20210001726A (ko) 2019-06-28 2021-01-06 엘지전자 주식회사 세탁기의 제어방법
JP7478920B2 (ja) * 2019-12-11 2024-05-08 パナソニックＩｐマネジメント株式会社 洗濯機、および洗濯機の制御方法

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JP2004016399A (ja) * 2002-06-14 2004-01-22 Sharp Corp 洗濯機
JP2009078068A (ja) * 2007-09-27 2009-04-16 Sanyo Electric Co Ltd 洗濯乾燥機
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2730690A1 (de) * 2012-11-13 2014-05-14 Panasonic Corporation Trommelwaschmaschine
US10619282B2 (en) 2013-09-05 2020-04-14 Samsung Electronics Co., Ltd. Washing machine and control method for same
EP3239381A4 (de) * 2014-12-26 2018-08-22 Haier Asia Co., Ltd Waschmaschine
US10508376B2 (en) 2014-12-26 2019-12-17 Haier Asia Co., Ltd. Washing machine
CN108342877A (zh) * 2017-01-23 2018-07-31 Bsh家用电器有限公司 具有控制装置的洗涤物护理器具
EP4095307A1 (de) * 2021-05-28 2022-11-30 BSH Hausgeräte GmbH Wäschepflegegerät mit einer steuerung

Also Published As

Publication number Publication date
JP2012205625A (ja) 2012-10-25
CN103459701A (zh) 2013-12-18
EP2692930A4 (de) 2015-04-15
WO2012132272A1 (ja) 2012-10-04

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