EP2228478A1 - Trommelwaschmaschine - Google Patents

Trommelwaschmaschine Download PDF

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Publication number
EP2228478A1
EP2228478A1 EP10154187A EP10154187A EP2228478A1 EP 2228478 A1 EP2228478 A1 EP 2228478A1 EP 10154187 A EP10154187 A EP 10154187A EP 10154187 A EP10154187 A EP 10154187A EP 2228478 A1 EP2228478 A1 EP 2228478A1
Authority
EP
European Patent Office
Prior art keywords
water
drum
washing tub
type washer
circulation channel
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.)
Granted
Application number
EP10154187A
Other languages
English (en)
French (fr)
Other versions
EP2228478B1 (de
Inventor
Yutaka Inoue
Shinji Matsuoka
Hiroko Minayoshi
Hideaki Ushijima
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
Priority claimed from JP2009054541A external-priority patent/JP4868010B2/ja
Priority claimed from JP2009054542A external-priority patent/JP4868011B2/ja
Application filed by Panasonic Corp filed Critical Panasonic Corp
Publication of EP2228478A1 publication Critical patent/EP2228478A1/de
Application granted granted Critical
Publication of EP2228478B1 publication Critical patent/EP2228478B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • 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
    • D06F39/088—Liquid supply arrangements

Definitions

  • the present invention relates to a drum-type washer for washing laundry in a rotating drum.
  • a drum-type washer includes drum 1 rotatably mounted in washing tub 3.
  • Drum 1 has a large number of water-through-holes 2 in the entire outer peripheral surface.
  • the washer also includes rotating shaft 4 fixed at one end to the rotation center of drum 1 and at the other end to drum pulley 5.
  • the washer also includes motor 6, which is connected to drum pulley 5 via belt 7 so as to rotate drum 1.
  • Drum 1 has an opening with lid 8.
  • Washing tub 3 is suspended inside washer body 9 by spring 10 and vibro-isolatedly supported by vibration free damper 11. Vibration of washing tub 3 during spin cycle is prevented from being transmitted to washer body 9 by vibration free damper 11 and is reduced by weight 12.
  • Washing tub 3 has drain outlet 17a at its bottom.
  • the washer also includes feed valve 13 for feeding water into washing tub 3, drainage pump 14 for draining water from washing tub 3, and heater 15 for heating water in washing tub 3.
  • the washer also includes control device 16, which controls the operations of motor 6, feed valve 13, drainage pump 14, heater 15, and the like so as to perform a series of cycles including wash, rinse, and spin cycles.
  • An example of a conventional technique related to the present invention is shown in Japanese Patent Unexamined Publication No. H10-201988 .
  • the user opens lid 8, loads laundry into drum 1, and turns the washer on to start a wash cycle.
  • feed valve 13 is opened to feed water into washing tub 3.
  • feed valve 13 is closed to stop feeding water.
  • drum 1 is rotated by motor 6 at low speed, raising the laundry in drum 1 and then dropping it into the water during the wash cycle.
  • the wash cycle is performed for a predetermined time, the water in washing tub 3 is drawn into drainage pump 14 via drain outlet 17a.
  • drainage pump 14 is operated to drain the water as intermediate spinning so as to start a rinse cycle.
  • the rinse cycle includes the same operation as the wash cycle.
  • drum 1 is rotated at high speed to centrifugally dehydrate the laundry.
  • the detergent poured into a detergent container (not shown) is supposed to be introduced into washing tub 3 together with the water flowing through feed valve 13 immediately after washing is started. This operation is done manually or by other means.
  • the detergent cleans and removes stains, providing a high cleaning effect.
  • the detergent introduced at the start of washing often drops directly through drain outlet 17a as detergent aggregates before it is completely dissolved in the water in washing tub 3. This causes the detergent to get into the drain space and then to be discharged without fulfilling its function.
  • the present invention provides a drum-type washer which allows detergent to provide excellent cleaning effect in the following manner. Even if the detergent drops through drain outlet 17a and accumulates in the drain space, it can be returned into washing tub 3 and dissolved in the water with the help of the rotation of drum 1.
  • the drum-type washer includes a rotating drum rotatable in a washing tub, the rotating drum having a rotation axis horizontal or inclined from a horizontal; a drain outlet in a bottom of the washing tub; a motor for rotating the rotating drum; a feed-water unit for feeding water into the washing tub; a drainage unit for draining water from the washing tub; and a controller for controlling at least the motor, the feed-water unit, and the drainage unit so as to perform at least wash, rinse, and spin cycles.
  • the washer further includes a water circulation channel, which is extended from a rear-side opening in the rear side of the washing tub and communicated with a drain space in the downstream of the drain outlet.
  • the cleaning water in the rotating drum goes out through the opening in the rear side of the drum into the water circulation channel, and flows into the drain space.
  • the cleaning water then stirs up the detergent that has accumulated in the drain space after dropping through the drain outlet, thereby returning the detergent into the washing tub.
  • the returned detergent is dissolved in the cleaning water in the washing tub or the drum by the rotation of the drum, thus coming into contact with laundry and fulfilling its function.
  • the drum-type washer provides excellent washing performance.
  • Fig. 1 is a sectional view of a side of a drum-type washer according to a first embodiment of the present invention.
  • Fig. 2 is a sectional view of a side of a washing tub of the washer.
  • Figs. 3 and 4 are a rear view and a longitudinal sectional view, respectively, of the washing tub.
  • the drum-type washer includes rotating drum 17 rotatably mounted in washing tub 19.
  • Rotating drum 17 is formed in a bottomed cylindrical shape and has a large number of water-through-holes 18 in the entire outer periphery.
  • Rotating drum 17 has rotating shaft 20 as its rotation axis, which is either horizontal or slightly inclined from the horizontal. More specifically, the rotation axis is inclined downward from the front side to the rear side of rotating drum 17.
  • Rotating shaft 20 is connected via belt 44 to motor 21, which is fixed on the bottom of washing tub 19 so that rotating drum 17 can be rotated by motor 21 in the forward and reverse directions.
  • Rotating drum 17 is provided on its inner circumference wall with several projection boards 22.
  • the washer also includes body 23 having opening 24, which is formed on the front side of washing tub 19 and in the direction perpendicular to an upwardly inclined surface of body 23. Opening 24 is covered with openable lid 25.
  • opening 24 is covered with openable lid 25.
  • the user opens lid 25 and loads the laundry into rotating drum 17 through opening 24, laundry loading-unloading opening 26 of washing tub 19, and laundry loading-unloading opening 27 of drum 17.
  • the user unloads the laundry from rotating drum 17 through these openings.
  • Providing lid 25 in the direction perpendicular to the upwardly inclined surface of body 23 allows the user to load and unload laundry without bending over too much.
  • Washing tub 19 is swingably suspended from body 23 by spring 28 and damper 29. Washing tub 19 is provided on its inside bottom with long U-shaped drainage ditch 30 along the direction of rotating shaft 20. Drainage ditch 30 is equipped with heater 50, and has drain outlet 31 at a position to its bottom rear side. Drain outlet 31 is connected to drain space 37, which is connected at its outlet with drainage channel 32 via drain valve 49 as a component of drainage unit 60. Drainage channel 32 is connected at the other end thereof with drainage pump 33 as another component of drainage unit 60, so that drainage pump 33 drains water from washing tub 19.
  • the washer also includes feed-water unit 65, which has feed valve 34a for feeding water into washing tub 19 via detergent container 35 and feed-water channel 36.
  • the washer also includes water level detector 48 for detecting the water level in washing tub 19.
  • the washer also includes control device 39, which has controller 38 composed of a microcomputer. Controller 38 controls the operations of motor 21, drainage pump 33, feed valves 34a and 34b, drain valve 49, and other components via a power switching unit (not shown) so as to control wash, rinse, spin, and dry cycles.
  • controller 38 composed of a microcomputer. Controller 38 controls the operations of motor 21, drainage pump 33, feed valves 34a and 34b, drain valve 49, and other components via a power switching unit (not shown) so as to control wash, rinse, spin, and dry cycles.
  • Control device 39 receives information from an input setting unit (not shown) for setting an operation course and other conditions, and displays the information on a display unit (not shown) provided therein.
  • the display unit is on the front side of body 23, so that the user can see it easily.
  • Control device 39 also has storage unit 75, which stores data required for controller 38 to control. Storage unit 75 and the display unit can be provided in control device 39 together with controller 38.
  • washing tub 19 is provided on its bottom with rear-side opening 45.
  • Rear-side opening 45 and opening 46 at the bottom of drain space 37 are connected via water circulation channel 47 so that the water used for washing can circulate there.
  • Water circulation channel 47 is formed by blow molding ethylene-propylene rubber (hereinafter "EPDM”), which is chemical and heat resistant, meaning to be resistant to warm water and detergent.
  • EPDM blow molding ethylene-propylene rubber
  • the use of EPDM can form water circulation channel 47 into a desired shape to fit within the limited space on the rear side of washing tub 19.
  • the user opens lid 25, which is a door to the washer, loads laundry into rotating drum 17, pours an appropriate amount of detergent into detergent container 35, and turns the washer on to start a wash cycle.
  • feed valve 34a is turned on to feed water, which is made to pass through detergent container 35 having the detergent therein and feed-water channel 36, and then is fed into washing tub 19 together with the detergent.
  • rotating drum 17 starts to be rotated at a first predetermined rotational speed which is, for example, 120 r/min. At this moment, rotating drum 17 rotates counterclockwise as viewed from the front.
  • the detergent-containing water is stirred, allowing the detergent to be dissolved in the water.
  • the water hits the sidewalls (not shown) of drainage ditch 30.
  • the sidewalls form the sides of U-shaped drainage ditch 30.
  • foam containing highly concentrated detergent in the water and on the water surface The foam grows and fills the space between rotating drum 17 and washing tub 19. The foam then expands to the front side of drum 17 and tub 19, gets into drum 17 through laundry loading-unloading opening 27, and finally permeates the laundry.
  • the produced foam envelops and removes stains from the laundry by the centrifugal force generated by the rotation of rotating drum 17. Then, the foam again passes through water-through-holes 18 in the outer periphery of rotating drum 17 and is discharged between drum 17 and washing tub 19, thereby washing the laundry. This operation is performed until the water in the washing tub 19 reaches a predetermined level, and then the rotational speed of rotating drum 17 is changed to a second predetermined rotational speed (for example, 45 r/min). Then, a washing operation is performed for a fixed time by repeating forward and reverse rotations alternately with pauses therebetween for a predetermined period of time (for example, a 20 sec ON time and a 7 sec OFF time).
  • a predetermined period of time for example, a 20 sec ON time and a 7 sec OFF time.
  • the rotation of rotating drum 17 at the second predetermined rotational speed causes the laundry in drum 17 to be raised in the direction of rotation by projection boards 22 formed on the inner circumference wall of drum 17.
  • the laundry is repeatedly raised and dropped from an appropriate height, thereby being beat-washed.
  • Beat-wash includes a combination of the mechanical action by drop impact and the detergent effect by the water circulating to and from water circulation channel 47.
  • the drum-type washer of the present invention includes rotating drum 17, drain outlet 31, motor 21, feed-water unit 65, drainage unit 60, and controller 38 controlling at least motor 21, feed-water unit 65, and drainage unit 60 so as to perform at least wash, rinse, and spin cycles.
  • Rotating drum 17 is rotatably mounted in washing tub 19, and has rotating shaft 20 as its rotation axis, which is either horizontal or inclined from a horizontal.
  • Drain outlet 31 is in the bottom of washing tub 19.
  • Motor 21 rotates rotating drum 17.
  • Feed-water unit 65 feeds water into washing tub 19.
  • Drainage unit 60 drains water from washing tub 19.
  • the drum-type washer of the present invention also includes water circulation channel 47 extended from rear-side opening 45, that is, the opening in the rear side of washing tub 19 in such a manner as to be communicated with drain space 37 in the downstream of drain outlet 31.
  • the opening in the rear side of washing tub 19, such as rear-side opening 45, can be formed at a position not lower than the rated water level in the wash cycle.
  • the rear side of washing tub 19 can be corrugated with alternating projections and recesses, and the opening on the rear side, such as rear-side opening 45, is formed in one of the recesses and connected to the downstream of drain outlet 31.
  • the water in washing tub 19 can be effectively collected to rear-side opening 45 of tub 19 during the rotation of rotating drum 17.
  • powerful cleaning water hits the detergent accumulated in drain space 37 and breaks detergent aggregates.
  • the turbulent flow generated in drain space 37 increases the dissolution speed of the detergent.
  • Drain space 37 has an opening such as opening 46 at the bottom thereof, the opening being communicated with the drain space 37 side of water circulation channel 47.
  • opening 46 of drain space 37 can have a simple structure, allowing a reduction in the cost of the mold.
  • the drum-type washer is inexpensive and provides excellent washing performance.
  • water circulation channel 47 has elbow-shaped ends.
  • water circulation channel 47 extending from the rear side of washing tub 19 to drain space 37 can be compact.
  • water circulation channel 47 can be accommodated within the limited space on the rear side of drum-type washer, thereby making washer body 23 compact.
  • Water circulation channel 47 is made of chemical and heat resistant resin.
  • the inner wall surface of water circulation channel 47 can be prevented from being altered or deteriorated in quality by the hot water or the detergent during washing, allowing the washer to be long lasting.
  • Water circulation channel 47 may be formed by blow molding.
  • water circulation channel 47 can be formed into a desired shape at low cost, allowing the washer inexpensive.
  • Water circulation channel 47 may be made of EPDM.
  • the washer can be long lasting and chemical and heat resistant.
  • Fig. 5 is a sectional view of a side of a washing tub of a drum-type washer according to a second embodiment of the present invention.
  • the washer and the control device of the second embodiment are structured basically the same as those in the first embodiment. More specifically, the difference is that opening 46, which is at the bottom of drain space 37 in the first embodiment, is on a side of drain space 37 in the second embodiment as shown in Fig. 5 .
  • opening 46 is on a side of drain space 37, the rotation of rotating drum 17 allows the water flown through water circulation channel 47 to hit the detergent accumulated in drain space 37 from the side.
  • the water flown through drain outlet 31 and the water flown through opening 46 produce a turbulent flow in drain space 37.
  • the turbulent flow hits and moves the detergent, thereby effectively dissolving it.
  • the water flown through opening 46 pushes the detergent accumulated in drain space 37 from the side.
  • the detergent thus pushed is mixed with the water present on the opposite side, thereby producing a turbulent flow in the water.
  • the turbulent flow effectively stirs up the detergent from drain space 37 into washing tub 19, so that the detergent is brought again into contact with the laundry, thereby removing stain therefrom more effectively. As a result, the washer has excellent washing performance.
  • drain space 37 has opening 46 at a side thereof, opening 46 being communicated with the drain space 37 side of water circulation channel 47.
  • the cleaning water which is the powerful water flowing from different directions, hit the detergent accumulated in drain space 37, thereby breaking the detergent aggregates. Furthermore, the turbulent flow generated in drain space 37 increases the dissolution speed of the detergent.
  • water circulation channel 47 has elbow-shaped ends.
  • water circulation channel 47 extending from the rear side of washing tub 19 to drain space 37 can be compact.
  • water circulation channel 47 can be accommodated within the limited space on the rear side of the drum-type washer, thereby making washer body 23 compact.
  • Water circulation channel 47 is made of chemical and heat resistant resin.
  • the inner wall surface of water circulation channel 47 can be prevented from being altered or deteriorated in quality by the hot water or the detergent during washing, allowing the washer to be long lasting.
  • Water circulation channel 47 may be formed by blow molding.
  • water circulation channel 47 can be formed into a desired shape at low cost, allowing the washer inexpensive.
  • Water circulation channel 47 may be made of EPDM.
  • the washer can be long lasting and chemical and heat resistant.
  • Fig. 6 is a longitudinal sectional view of a washing tub of a drum-type washer according to a third embodiment of the present invention.
  • a sectional view of a side of the washer and a rear view of the washing tub of the washer according to the third embodiment are identical to those in the first embodiment as shown in Figs. 1 and 3 , respectively.
  • the drum-type washer of the present third embodiment is substantially the same as in the first embodiment, and hence, the description thereof will be omitted.
  • lid 25 which is a door to the washer, loads laundry into rotating drum 17, closes lid 25, and turns on the power switch. Then, the user selects a course and cycles shown on the operation panel, and presses the start button to start the operation. As a result, lid 25 is locked.
  • Feed valve 34a is turned on to feed water into washing tub 19 through feed-water channel 36. Then, it is determined whether the water has reached a predetermined water level S1 (for example, 0 mm or the reset water level) by a water level sensor (not shown) or the like. When it is affirmatively determined, feed valve 34a is turned off to stop feeding water; otherwise, the water feeding is continued. When the water level S1 is determined to have been reached, motor 21 is driven to rotate rotating drum 17. Next, it is determined whether rotating drum 17 has reached a first predetermined rotational speed (for example, 85 r/min). When it is affirmatively determined, the process goes to the next cycle; otherwise, the rotation is continued to increase the rotational speed.
  • a predetermined water level S1 for example, 0 mm or the reset water level
  • feed valve 34b When the first predetermined rotational speed is determined to have been reached, feed valve 34b is turned on to start feeding water. The water is made to pass through feed-water channel 36 and detergent container 35 and is fed into washing tub 19 together with detergent. Thus, the detergent is introduced into washing tub 19.
  • a predetermined water level S2 for example, 60 mm
  • the process proceeds to the next cycle where feed valve 34b is turned off to stop feeding water; otherwise, the water feeding is continued.
  • a predetermined rotation time T1 it is also determined whether a predetermined rotation time T1 has been passed.
  • the detergent-containing water is stirred, allowing the detergent to be dissolved in the water.
  • the water hits the sidewalls of drainage ditch 30.
  • this produces foam containing highly concentrated detergent which grows and fills the space between rotating drum 17 and washing tub 19.
  • the foam then expands to the front side of rotating drum 17 and washing tub 19, gets into rotating drum 17 through laundry loading-unloading opening 27, and finally permeates the laundry.
  • most of the detergent that has reached drainage ditch 30 is dissolved by stirring.
  • some of the detergent that remains without being dissolved in the water sometimes drops through drain outlet 31 and accumulates in drain space 37.
  • rotating drum 17 starts to be rotated at a second predetermined rotational speed (for example, 120 r/min).
  • a second predetermined rotational speed for example, 120 r/min.
  • rotating drum 17 rotates counterclockwise as viewed from the front.
  • the produced foam envelops and removes stains from the laundry by the centrifugal force generated by the rotation of rotating drum 17.
  • the foam again passes through water-through-holes 18 in the outer periphery of rotating drum 17 and is discharged between drum 17 and washing tub 19, thereby washing the laundry.
  • This operation is performed for a predetermined time until the water in the washing tub 19 reaches a predetermined level.
  • the process performed at the first and second predetermined rotational speeds is what is called a "foaming cycle", which is a previous step of a full-scale washing.
  • the foaming cycle has a main purpose of dissolving and dispersing detergent in the water so as to generate highly concentrated foam, and permeating the washing solution into the laundry.
  • the rotational speed of rotating drum 17 is changed to a third predetermined rotational speed (for example, 45 r/min). Then, a washing operation is performed for a fixed time by repeating forward and reverse rotations alternately as a first ON time with pauses as a first OFF time therebetween (for example, a 20 sec ON time and a 7 sec OFF time).
  • the rotation of motor 21 is shown in Fig. 7 .
  • Fig. 7 is a sequence diagram of control signals of motor 21 and heater 50 of the washer of the present third embodiment.
  • the control signals of motor 21 are shown as signals to control the rotation of drum 17.
  • the rotation of rotating drum 17 at the third predetermined rotational speed causes the laundry in drum 17 to be raised in the direction of rotation by projection boards 22 formed on the inner circumference wall of drum 17.
  • the laundry is repeatedly raised and dropped from an appropriate height, thereby being beat-washed.
  • the water is then pushed out through opening 46 at the bottom of drain space 37, and the water force pushes up the detergent accumulated in drain space 37 to drain outlet 31.
  • the water in drain space 37 is discharged into washing tub 19, and at the same time, a turbulent flow is generated in the vicinity of drain outlet 31.
  • the turbulent flow efficiently mixes the detergent and the water, thereby accelerating the dissolution of the accumulated detergent.
  • the washing is performed by repeating the first ON time and the first OFF time.
  • the stirring time of rotating drum 17 is changed to a second ON time and a second OFF time.
  • the second ON time is longer than the first ON time by a fixed time.
  • the stirring time is, for example, a 35 sec ON time and a 4 sec OFF time.
  • the stirring time of rotating drum 17 is changed from the first ON and OFF times to the second ON and OFF times, the scheduled time has passed after the start of the wash cycle, and therefore, the detergent has been well dissolved and hardly accumulates in drain space 37. Even so, in order to minimize the accumulation of the detergent that remains without being dissolved, the second ON time is set longer than the ON time set at the start of the wash cycle. This allows the detergent that has dropped into water circulation channel 47, for example, at reverse rotation of rotating drum 17 to flow from opening 46 of drain space 37 to rear-side opening 45 of washing tub 19, and then to return to washing tub 19. As a result, less amount of detergent accumulates in drain space 37.
  • the rotation of rotating drum 17 allows water circulation channel 47 to have opposite water flows: the water flowing into washing tub 19 from water circulation channel 47, and the water flowing out of washing tub 19 into water circulation channel 47.
  • the improved dissolution of the detergent can generate highly concentrated washing solution in a shorter time than before. This shortens the wash time without decreasing the washing effect.
  • the drum-type washer of the present invention includes rotating drum 17, drain outlet 31, motor 21, feed-water unit 65, drainage unit 60, and controller 38 controlling at least motor 21, feed-water unit 65, and drainage unit 60 so as to perform at least wash, rinse, and spin cycles.
  • Rotating drum 17 is rotatably mounted in washing tub 19, and has rotating shaft 20 as its rotation axis, which is either horizontal or inclined from a horizontal.
  • Drain outlet 31 is in the bottom of washing tub 19.
  • Motor 21 rotates rotating drum 17.
  • Feed-water unit 65 feeds water into washing tub 19.
  • Drainage unit 60 drains water from washing tub 19.
  • the washer of the present invention also includes water circulation channel 47 extended from rear-side opening 45, that is, the opening in the rear side of washing tub 19 in such a manner as to be communicated with drain space 37 in the downstream of drain outlet 31.
  • the washer of the present invention also includes heater 50, which is a component of a heating unit for heating water. Controller 38 turns on and off motor 21 in the wash cycle so as to circulate water to and from water circulation channel 47.
  • controller 38 controls the ON time of motor 21 to be longer than the ON time set at the start of the wash cycle.
  • rotating drum 17 is rotated at low speed so as to reduce the convection of water in washing tub 19, thereby maximizing the effect of heating the water.
  • rotating drum 17 is rotated at high speed so as to increase the circulating volume of the heated water, and hence, the solubility of the detergent, thereby providing high detergency performance.
  • controller 38 controls the OFF time of motor 21 to be shorter than the OFF time set at the start of the wash cycle.
  • Controller 38 controls heater 50 to be ON for the predetermined time after the start of a wash cycle, and to be OFF when the predetermined time has passed, also controls the ON time of motor 21 to be longer than the ON time set at the start of the wash cycle.
  • FIG. 1 A sectional view of a side of a drum-type washer according to a fourth embodiment of the present invention is shown in Fig. 1 , which is the same as in the first embodiment.
  • FIG. 1 A rear view and a longitudinal sectional view of washing tub 19 of the washer according to the fourth embodiment are identical to those in the first embodiment as shown in Figs. 3 and 6 , respectively.
  • the drum-type washer of the present fourth embodiment has a foaming cycle and a wash cycle as in the first embodiment.
  • Fig. 7 is a sequence diagram of control signals of motor 21 and heater 50 of the washer according to the fourth embodiment.
  • the control signals of motor 21 are shown as signals to control the rotation of rotating drum 17.
  • the sequence diagram is identical to that of the third embodiment.
  • rotating drum 17 is rotated in a shorter time and stopped for a longer time than after the predetermined time has passed. This allows the water in rotating drum 17 to flow slowly, and the detergent that remains without being dissolved to be easily dropped and collected in drainage ditch 30 in the bottom of washing tub 19.
  • the water around heater 50 in the recess of drainage ditch 30 is heated up when heater 50 is turned on. Since rotating drum 17 is rotated slowly, the water around heater 50 moves little and is heated up.
  • the detergent that remains without being dissolved is collected in drainage ditch 30 having heater 50 therein is mixed with the heated water, thereby being dissolved in an accelerated manner.
  • the water in washing tub 19 is warm, and is fed from rear-side opening 45 to drain space 37 through water circulation channel 47.
  • the water originally drawn in drain space 37 is heated up so as to effectively dissolve the detergent.
  • the stirring time of rotating drum 17 is changed to make the ON time longer and the OFF time shorter by a predetermined time.
  • the water in water circulation channel 47 continues to flow all the time, thereby dissolving more of the detergent, and allowing the detergent to have its full cleaning effect.
  • the drum-type washer provides excellent washing performance.
  • Controller 38 controls heater 50 to be ON for the predetermined time after the start of a wash cycle, and to be OFF when the predetermined time has passed, and also controls the OFF time of motor 21 to be shorter than the OFF time set at the start of the wash cycle.
  • the heat time of heater 50 and the switching from the first to the second ON time of rotating drum 17 are in unison with each other.
  • the water in washing tub 19 is heated to the maximum extent possible, and the water heated to a preset temperature is circulated. Later, the ON time is made longer so that more water can be circulated from washing tub 19 to drain space 37 through water circulation channel 47.
  • the heat time of heater 50 is changed according to the water temperature, the amount of laundry, and the amount of water at the start of washing, the detergent can be dissolved effectively, providing its full cleaning effect.
  • the drum-type washer of the present invention which allows detergent accumulated in the drain space during washing to be effectively dissolved by making use of the water movement in the water circulation channel, provides excellent washing performance.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Control Of Washing Machine And Dryer (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
EP10154187A 2009-03-09 2010-02-22 Trommelwaschmaschine Not-in-force EP2228478B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2009054541A JP4868010B2 (ja) 2009-03-09 2009-03-09 ドラム式洗濯機
JP2009054542A JP4868011B2 (ja) 2009-03-09 2009-03-09 ドラム式洗濯機

Publications (2)

Publication Number Publication Date
EP2228478A1 true EP2228478A1 (de) 2010-09-15
EP2228478B1 EP2228478B1 (de) 2011-07-20

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Application Number Title Priority Date Filing Date
EP10154187A Not-in-force EP2228478B1 (de) 2009-03-09 2010-02-22 Trommelwaschmaschine

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Country Link
EP (1) EP2228478B1 (de)
CN (2) CN101831777B (de)
AT (1) ATE517205T1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE517205T1 (de) * 2009-03-09 2011-08-15 Panasonic Corp Trommelwaschmaschine
JP2013223551A (ja) * 2012-04-20 2013-10-31 Hitachi Appliances Inc 洗濯機
CN102733155B (zh) * 2012-06-02 2015-03-11 松下家电研究开发（杭州）有限公司 一种前置进水滚筒洗衣机
JP6937467B2 (ja) * 2018-02-27 2021-09-22 パナソニックＩｐマネジメント株式会社 洗濯機
CN109338677B (zh) * 2018-11-01 2023-06-13 合肥海尔滚筒洗衣机有限公司 一种洗衣机
KR102638188B1 (ko) 2019-02-01 2024-02-16 엘지전자 주식회사 개스킷에 형성된 복수의 순환 노즐로 순환수를 공급하는 순환수 급수관을 구비한 세탁기 및 상기 순환수 급수관의 제조방법
CN115679573A (zh) * 2021-07-29 2023-02-03 香港纺织及成衣研发中心有限公司 用于使纺织物褪色的滚筒洗涤机及洗涤方法

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EP2228478B1 (de) 2011-07-20
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CN201620278U (zh) 2010-11-03
CN101831777B (zh) 2012-07-04

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