US20070157677A1 - Drum washing machine - Google Patents

Drum washing machine Download PDF

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Publication number
US20070157677A1
US20070157677A1 US10/587,072 US58707204A US2007157677A1 US 20070157677 A1 US20070157677 A1 US 20070157677A1 US 58707204 A US58707204 A US 58707204A US 2007157677 A1 US2007157677 A1 US 2007157677A1
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United States
Prior art keywords
rotating tub
tub
washing machine
laundry
drum washing
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.)
Abandoned
Application number
US10/587,072
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English (en)
Inventor
Hisao Tatsumi
Hiroshi Nishimura
Tatsuo Ioku
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.)
Toshiba Corp
Toshiba Consumer Marketing Corp
Toshiba Lifestyle Products and Services Corp
Original Assignee
Toshiba Consumer Marketing 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 Toshiba Consumer Marketing Corp filed Critical Toshiba Consumer Marketing Corp
Assigned to TOSHIBA HA PRODUCTS CO., LTD., TOSHIBA CONSUMER MARKETING CORPORATION, KABUSHIKI KAISHA TOSHIBA reassignment TOSHIBA HA PRODUCTS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IOKU, TATSUO, NISHIMURA, HIROSHI, TATSUMI, HISAO
Publication of US20070157677A1 publication Critical patent/US20070157677A1/en
Abandoned 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/20—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations
    • D06F37/22—Mountings, e.g. resilient mountings, for the rotary receptacle, motor, tub or casing; Preventing or damping vibrations in machines with a receptacle rotating or oscillating about a horizontal axis
    • 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
    • D06F23/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry 
    • D06F23/06—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement, the receptacle serving both for washing and for centrifugally separating water from the laundry  and rotating or oscillating about an inclined axis
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • D06F37/04—Rotary receptacles, e.g. drums adapted for rotation or oscillation about a horizontal or inclined axis
    • D06F37/06—Ribs, lifters, or rubbing means forming part of the receptacle
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/26—Casings; Tubs
    • D06F37/267—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups
    • D06F37/268—Tubs specially adapted for mounting thereto components or devices not provided for in preceding subgroups for suspension devices
    • 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 
    • D06F39/12—Casings; Tubs
    • D06F39/125—Supporting arrangements for the casing, e.g. rollers or legs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/022—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using dampers and springs in combination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • This invention relates to a drum washing machine with a rotating tub rotated about a transverse axis.
  • a drum washing machine includes a rotating tub rotated about a transverse or substantially horizontal axis and a water tub accommodating the rotating tub.
  • the rotating tub has an inner peripheral wall provided with a plurality of baffles raising laundry.
  • water is reserved in the water tub and the rotating tub accommodating laundry is rotated at low speeds.
  • the laundry in the rotating tub is raised and then falls down repeatedly, whereby the laundry is washed by a beat-wash manner.
  • the rotating tub is rotated at low speeds so that water contained in the laundry is removed to some extent and thereafter, the rotational speed of the rotating tub is gradually increased up to a maximum speed so that the laundry is centrifugally dehydrated.
  • JP-A-2002-31598 proposes a construction in which auxiliary baffles are provided on a rear end plate of the rotating tub in a drum washing machine with a rotating tub inclined frontward upward in order that reduction in the cleaning performance due to the unbalanced state of laundry may be restrained.
  • Laundry tends to be easily one-sided to an inner interior of the rotating tub when the rotating tub is inclined frontward upward. According to the foregoing construction, the laundry one-sided in the inner interior of the rotating tub is sufficiently agitated, washing unevenness can be restrained.
  • Patent document JP-A-2002-31598
  • auxiliary baffles are provided for the purpose of agitating laundry which is located at the inner interior of the rotating tub and cannot be agitated by the conventional baffles. That is, even when the auxiliary baffles are provided, the washing operation is continued while the problem of laundry being one-sided to the inner interior of the rotating tub remains unsolved. As a result, large vibration or noise tends to occur easily in the dehydration step.
  • an object of the present invention is to provide a drum washing machine which can suppress occurrence of vibration or noise in the dehydration step.
  • the present invention provides a drum washing machine comprising a water tub, a rotating tub provided in the water tub to be rotated about a transverse axis, elastic supporting means for elastically supporting the water tub, and an auxiliary baffle provided on an inner peripheral wall of the rotating tub so as to be close to one of both axial end plates of the rotating tub and spaced away from the other end plate of the rotating tub, the auxiliary baffle extending in a direction of axis of the rotating tub, characterized in that the auxiliary baffle moves laundry in the rotating tub near a center of gravity of a member of vibration system applying load to the elastic supporting means.
  • the auxiliary baffle has an inclined face inclined at the inner peripheral wall side from one end plate side of the rotating tub to the other end plate side.
  • FIG. 1 is a perspective view of a drum washing machine in accordance with one embodiment of the present invention
  • FIG. 2 is a longitudinal side section of the drum washing machine
  • FIG. 3 is a perspective view of a rotating tub with a drum lid being eliminated;
  • FIG. 4 is an enlarged perspective view of an auxiliary baffle
  • FIG. 5 is a view explaining the difference between a centrifugal force applied to laundry located at an outer peripheral position and a centrifugal force applied to laundry located at an inner peripheral position in the rotating tub;
  • FIG. 6 is a view explaining a centrifugal force applied to laundry and moment of inertia about the center of gravity;
  • FIG. 7 is a graph showing differences in entanglement rates upon completion of drying between a case where an auxiliary baffle is provided and a case where no auxiliary baffle is provided;
  • FIG. 8 is a graph showing differences in vibration produced in the dehydration step between a case where an auxiliary baffle is provided and a case where no auxiliary baffle is provided and further between different sizes of auxiliary baffles;
  • FIG. 9 is a graph showing differences in the vibration amplitude when an auxiliary baffle 23 takes different values of height.
  • FIG. 10 is a graph showing differences in the vibration amplitude when an auxiliary baffle 23 takes different values of axial dimension.
  • Reference symbol 1 designates a drum washing machine, 10 a water tub, 11 suspension (elastic supporting means), 14 a rotating tub, 15 a tub shaft, 20 , 21 and 22 main baffles, 23 an auxiliary baffle, and 23 a and 23 b inclined faces.
  • FIGS. 1 to 10 illustrate one embodiment of the invention.
  • the invention is applied to a drum washing machine of the open top type in the embodiment.
  • a washing machine 1 in accordance with the embodiment of the invention comprises a base plate 2 , an outer cabinet 3 fixed on the base plate 2 and a top cover 5 attached to an upper part of the outer cabinet 3 and having an access opening 4 through which laundry is put into and taken out of a rotating tub.
  • the outer cabinet 3 comprises a main body 6 and a front panel 7 .
  • the top cover 5 is provided with an outer lid 8 opening and closing the access opening 4 .
  • the outer lid 8 is formed into a foldable type and includes a front lid 8 a and a rear lid 8 b.
  • An operation panel 9 is provided on a right front of the top cover 5 .
  • a generally cylindrical water tub 10 is elastically supported by a plurality of suspensions 11 (corresponding to elastic supporting means) in the outer cabinet 3 .
  • Each suspension 11 comprises a damper 11 a and a suspension coil spring 11 b.
  • the water tub 10 has an opening 13 formed in an upper part thereof. The opening 13 is opened and closed by an inner lid 12 . When the opening 13 is closed by the inner lid 12 , a watertight seal is provided between the inner lid 12 and the opening 13 .
  • a generally cylindrical rotating tub 14 is rotatably supported in the water tub 10 .
  • the rotating tub 14 has a diameter of about 520 mm and an axial dimension of about 400 mm.
  • the rotating tub 14 serves as a washing tub, dehydrating tub and drying tub.
  • the rotating tub 14 has a peripheral wall formed with a number of small holes (not shown).
  • a pair of substantially horizontally extending tub shafts 15 are mounted on left and right end plates of the rotating tub 14 respectively.
  • the tub shafts 15 are rotatably supported on bearings (not shown) provided on the left and right end plates of the water tub 10 respectively.
  • the tub shafts 15 extend substantially horizontally.
  • An electric motor (not shown) is mounted on the left end plate of the water tub 10 .
  • the motor has a rotating shaft coupled to an end of the tub shaft 15 supported by the left end plate of the water tub 10 .
  • the rotating tub 14 is directly driven by the motor.
  • Reference symbol “O” in FIG. 2 designates a center of the tub shaft 15 , namely, an axis passing through center of rotation of the rotating tub 14 .
  • the peripheral wall of the rotating tub 14 is formed with an opening 17 (see FIG. 3 ) opened and closed by a drum lid 16 .
  • the drum lid 16 comprises a main plate 18 pivoting about a fulcrum 18 a ( FIG. 2 ) and an auxiliary plate 19 pivoting about a fulcrum 19 a.
  • the main and auxiliary plates 18 and 19 are linked by a link mechanism (not shown) so as to be opened and closed.
  • a link mechanism not shown
  • a plurality of, for example, three, main baffles 20 to 22 each of which has a generally triangular section are provided on the inner peripheral wall of the rotating tub 14 .
  • the main baffles 20 to 22 are disposed substantially at regular intervals.
  • the two main baffles 20 and 21 are disposed at both sides of the opening 17 so as to sandwich the opening 17 .
  • Each of these main baffles has a length set at about 230 mm.
  • the other main baffle 22 is disposed so as to be opposed to the opening 17 with the center of rotation of the tub 14 being located therebetween.
  • the main baffle 22 has a length set at about 320 mm.
  • Each of the main baffles 20 to 22 has a height (radial dimension of the rotating tub 14 ) set at about 30 mm.
  • the main baffles 20 to 22 are disposed near the axial middle of the inner peripheral wall so as to be spaced away from both end plates by the same distance.
  • the longer main baffle 22 encloses a counterweight to balance itself with the drum lid 16 although the counterweight is not shown.
  • auxiliary baffles 23 two pairs are provided between the main baffles 20 and 21 and between the main baffles 21 and 22 on the inner peripheral wall of the rotating tub 14 respectively.
  • the auxiliary baffles 23 of each pair are disposed on the left and right ends of the inner peripheral wall of the rotating tub 14 respectively so as to be axially opposed to each other.
  • Each auxiliary baffle 23 is fixed to the inner peripheral wall of the rotating tub 14 by screws so as to be in contact with the left or right end plate of the tub.
  • Each auxiliary baffle 23 generally has the shape of a triangular pyramid and is tapered from either end plate of the rotating tub 14 toward the axial middle of the inner peripheral wall of the tub.
  • Each auxiliary baffle 23 has a narrow inclined face 23 a extending from either one end plate of the rotating tub 14 toward the other end plate and inclined to the inner peripheral wall side.
  • Each auxiliary baffle 23 further has triangular inclined faces 23 b extending from the inclined face 23 a toward the inner peripheral wall of the rotating tub 14 and inclined to both peripheral sides respectively.
  • Reference symbol “H 1 ” designates a height of a portion of each auxiliary baffle 23 in contact with either end plate of the rotating tub 14 (radial dimension of the rotating tub 14 ) as shown in FIG. 4 .
  • the height H 1 is set at about 65 mm.
  • reference symbol “H 2 ” designates a length of the inner peripheral wall of the rotating tub 14 .
  • the length H 2 is set at about 100 mm.
  • the inner peripheral wall of the rotating tub 14 has an opening (not shown) formed in a portion thereof located between the main baffle 22 and the auxiliary baffle 23 disposed between the baffles 21 and 22 . Laundry which has entered a space between the water tub 10 and the rotating tub 14 is recovered through the opening. The opening is closed by a cover 25 .
  • members of the vibration system include the water tub 10 , rotating tub 14 , electric motor, etc. applying load to the suspensions 11 .
  • the members of the vibration system have a center of gravity located at an axial middle of the rotating tub 14 .
  • control microcomputer (not shown) accommodated in the outer cabinet 3 .
  • the control microcomputer carries out steps of a previously determined operation course. For example, when the washing operation starts with a standard operation course being set, the control microcomputer carries out wash, rinse, dehydration and drying steps sequentially.
  • the control microcomputer drives the water supply so that water is supplied into the water tub 10 until a predetermined water level is reached, and thereafter, the control microcomputer drives the motor so that the rotating tub 14 is rotated alternately in the normal and reverse directions at low speeds.
  • the control microcomputer controls the motor so that the opening 17 is opposed to the opening 13 of the water tub 17 .
  • the laundry located at both axial ends of the rotating tub 14 can be moved near the main baffles 20 to 22 by the auxiliary baffles although the auxiliary baffles 23 have a smaller action of raising the laundry than the main baffles 20 to 22 . Furthermore, when the laundry is moved near the main baffles 20 to 22 by the auxiliary baffles 23 , a mechanical force is applied to the laundry located at each axial end of the rotating tub 14 such that the laundry is pressed, whereupon the cleaning performance can be improved.
  • the control microcomputer drives the drainage so that water is drained from the water tub 10 and thereafter drives the motor so that the rotating tub 14 is rotated in one direction at a low speed of about 40 rpm.
  • the laundry containing a large amount of water upon completion of draining are located at a lower interior of the rotating tub 14 . Accordingly, when the rotating tub 14 is rotated at the low speed, the laundry is raised by the main baffles 20 to 22 and then falls down repeatedly. As a result, a certain amount of water contained in the laundry is extracted.
  • the control microcomputer then drives the motor so that the rotating tub 14 is rotated at a speed ranging from 60 to 80 rpm in one direction.
  • the laundry is moved in the rotating tub 14 by the main baffles 20 to 22 and auxiliary baffles 23 , sticking uniformly to an entire inner peripheral wall of the rotating tub 14 .
  • the laundry located near an axially central interior of the rotating tub 14 is raised by the main baffles 20 to 22 .
  • the laundry then sticks to the inner peripheral wall of the rotating tub 14 or falls down depending upon a magnitude of centrifugal force applied to the laundry.
  • FIG. 5 explains a centrifugal force applied to laundry S in the rotating tub 14 .
  • the centrifugal force F is in proportion to the distance r as shown in equation (1).
  • a distance r 1 from the center of gravity of laundry S 1 located at the outer peripheral side to the central rotation axis O is larger than a distance r 2 from the center of gravity of laundry S 2 located at the inner peripheral side to the central rotation axis O (r 1 >r 2 ). Accordingly, a centrifugal force applied to the laundry S 1 becomes larger than a centrifugal force applied to the laundry S 2 .
  • the laundry raised by the main baffles 20 to 22 the laundry located at the outer peripheral side sticks to the inner peripheral wall without falling down, whereas the laundry located at the inner peripheral side falls down. Consequently, the laundry in the rotating tub 14 is gradually dispersed, sticking to the inner peripheral wall.
  • each auxiliary baffle 23 has the shape of the triangular pyramid, the laundry is moved by the inclined faces 23 a near the axial center of the rotating tub 14 and further moved by the inclined faces 23 b from the peripheral both sides of each auxiliary baffle 23 near the axial center. Consequently, the laundry is gathered near the axial center of the rotating tub 14 .
  • the laundry gathered near the axial center of the rotating tub 14 is caused to stick uniformly to the inner peripheral surface of the rotating tub 14 by the action of the above-described main baffles 20 to 22 .
  • the laundry in the rotating tub 14 is gradually dispersed to the entire inner peripheral wall surface such that the unbalanced condition is reduced.
  • an amount of laundry located near the axial center of the rotating tub 14 becomes larger than an amount of laundry located near both ends of the tub.
  • the control microcomputer drives the motor so that the rotational speed of the rotating tub 14 is increased to about 100 rpm. This determination is made, for example, by detecting variations in the rotational speed (rotation unevenness) of the motor during one turn of the rotating tub.
  • the rotational speed (100 rpm) is set at a rotational speed at which the centrifugal force applied to all the laundry in the tub 14 exceeds the gravitational acceleration. Accordingly, in this case, the rotating tub 14 is rotated while all the laundry has stuck to the inner peripheral wall of the rotating tub 14 .
  • the control microcomputer drives the motor so that the rotational speed of the tub 14 is increased to a maximum speed ranging from 900 to 1200 rpm.
  • a maximum speed ranging from 900 to 1200 rpm.
  • the laundry sticking to the inner peripheral wall of the rotating tub 14 is rotated together with the rotating tub 14 , whereby the laundry is centrifugally dehydrated.
  • the control microcomputer decreases the rotational speed of the tub 14 so that the laundry in the tub 14 is moved, so that an operation is carried out to correct the unbalanced condition resulting in the resonant vibration. After correction of the unbalanced condition, the control microcomputer again increases the rotational speed of the rotating tub 14 up to the maximum speed.
  • FIG. 5 explains vibration produced during dehydration.
  • the magnitude of the vibration produced during dehydration depends upon an exciting force.
  • the magnitude of the exciting force depends upon a centrifugal force applied to the laundry S and moment of inertia M about the center of gravity acting upon the laundry S.
  • Reference symbol “F” designates the centrifugal force acting upon the laundry as described above.
  • the moment of inertia M is in proportion to the distance r and distance L. Further, the centrifugal force F is in proportion to the distance r as described above. Accordingly, the vibration due to the unbalanced condition near the axial center of the rotating tub 14 becomes smaller than the vibration due to the unbalanced condition at each of both axial ends in the rotating tub 14 .
  • the unbalanced condition exists near the axial center in the interior of the rotating tub 14 , namely, near the center of gravity of the vibration system. Consequently, vibration produced in the dehydration step can be reduced as compared with the conventional drum washing machine in which the unbalanced condition occurs at each of axial ends of the rotating tub.
  • the control microcomputer drives the motor so that the rotating tub 14 is rotated alternately in the normal and reverse directions at low speeds and drives the drier.
  • hot air is supplied into the rotating tub 14 so that moisture contained in the laundry is extracted. Air containing moisture is dehumidified and heated and thereafter, again returned into the rotating tub 14 .
  • the laundry in the rotating tub 14 is dried by the aforementioned air circulation.
  • the laundry in the tub is raised by the main baffles 20 to 22 and then caused to fall down by the hot air flowing in the tub while spreading. Further, the auxiliary baffles 23 moves the laundry fallen in the spread state near the axial center of the rotating tub 14 . In other words, the laundry is caused to move in the rotating tub 14 while being dispersed and gathered. Consequently, since the laundry is efficiently brought into contact with the hot air flowing in the rotating tub 14 , the drying efficiency can be improved.
  • FIG. 7 is a bar graph showing comparison of entanglement rates at the time of completion of the drying step between the drum washing machine (P in FIG. 7 ) having the main baffles 20 to 22 and auxiliary baffles 23 and a drum washing machine (Q in FIG. 7 ) having only the main baffles 20 to 22 .
  • the Axis of abscissas represents an amount of laundry and the axis of ordinates represents an entanglement rate.
  • an entanglement rate is lower in the drum washing machine with the auxiliary baffles 23 than in a washing machine without auxiliary baffles 23 .
  • the drying step laundry is moved in the rotating tub 14 while being dispersed and gathered by cooperation of the main baffles 20 to 22 and the auxiliary baffles 23 .
  • the main baffles 20 to 22 and the auxiliary baffles 23 are spaced from each other, these baffles efficiently cooperate to move the laundry. Consequently, the drying efficiency can be improved and the entanglement of laundry can be reduced.
  • the experiment conducted by the inventors shows that an amount of wrinkle produced on the laundry at the time of completion of the drying is smaller in the drum washing machine with the auxiliary baffles 23 than in the drum washing machine without auxiliary baffles. This results from the reduced entanglement rate in the drying step. Accordingly, the laundry can be finished in a more favorable condition.
  • FIG. 8 shows the results of an experiment conducted by the inventors regarding differences in amplitude of vibration produced during dehydration depending upon provision or non-provision of the auxiliary baffles 23 and the sizes of the tub.
  • the axis of abscissas represents an amount of laundry (kg) and the axis of ordinates represents amplitude of vibration (mm).
  • polygonal lines P 1 to P 4 represent the drum washing machine with the main baffles 20 to 22 and auxiliary baffles 23
  • polygonal line Q represents a drum washing machine with only the main baffles 20 to 22 .
  • (60 mm, 40 mm), (60 mm, 65 mm), (100 mm, 40 mm) and (100 mm, 65 mm) are combinations of the lengths (H 1 , H 2 ; and see FIG. 4 ) of auxiliary baffles of the drum washing machine corresponding to the polygonal lines P 1 to P 4 .
  • the amplitude of vibration produced during dehydration is smaller in the drum washing machine with the main baffles 20 to 22 and auxiliary baffles 23 than in the drum washing machine with only the main baffles 20 to 22 .
  • the drum washing machine as represented by the polygonal line P 4 namely, the drum washing machine of the embodiment has the smallest amplitude. Consequently, the vibration produced during dehydration can be reduced to a large extent.
  • FIGS. 9 and 10 are graphs made on the basis of the experimental results of FIG. 8 in order that differences in the vibration amplitude due to the differences in the height and the length of each auxiliary baffle 23 may be investigated. More specifically, the graph of FIG. 9 is made on the basis of the experimental results (corresponding to polygonal lines P 1 and P 2 in FIG. 8 ) regarding the drum washing machine with the auxiliary baffles 23 having the same length (60 mm) and different heights.
  • FIG. 9 represents the height of each auxiliary baffle 23 in mm and the axis of ordinates represents a reduced amount of amplitude in the drum washing machine without auxiliary baffles.
  • the graph of FIG. 10 is made on the basis of the experimental results (corresponding to polygonal lines P 1 and P 3 in FIG. 8 ) regarding the drum washing machine with the auxiliary baffles 23 having the same height (40 mm) and different lengths.
  • the Axis of abscissas in FIG. 10 represents the length of each auxiliary baffle 23 in mm and the axis of ordinates represents a reduced amount of amplitude in the drum washing machine without auxiliary baffles in mm.
  • polygonal lines K 1 to K 4 in FIGS. 9 and 10 are made on the basis of data in the cases where an amount of laundry is 1 kg, 3 kg, 5 kg and 8 kg.
  • each auxiliary baffle for which a reduced amount of vibration exceeds 0.5 mm has the height of not less than about 30 mm and the length of not less than about 50 mm.
  • each auxiliary baffle affects its action of raising laundry and has a relation with a thickness of the laundry. Since a general thickness of laundry is about 30 mm, it is preferable to set the height of each auxiliary baffle at 30 mm or above.
  • the length of each baffle affects its action of moving laundry from the axial ends of the rotating tub near the center of gravity of the vibration system.
  • the length of each baffle also has a relation with an axial dimension of the rotating tub and a distance from an end of the rotating tub to the center of gravity of the vibration system.
  • the axial dimension of the rotating tub 14 is 400 mm and the distance from the end plate of the rotating tub 14 to the center of gravity is 200 mm.
  • each auxiliary baffle from which a significant vibration reduction can be achieved is not less than one eighth of the length of the rotating tub 14 and not less than a quarter of the distance from the end plate to the center of gravity.
  • the auxiliary baffles 23 need to be disposed in a region of the inner peripheral wall surface of the rotating tub 14 from the plane G (see FIG. 5 ).
  • auxiliary baffles disposed at both axial sides of the rotating tub may or may not be opposed to each other. Further, the auxiliary baffles may be provided on the inner peripheral wall so as to be located close to the end plate of the rotating tub but need not be in contact with the end plate.
  • auxiliary baffles located close to the front end plate may be provided on the front of the inner peripheral wall of the rotating tub in order that the laundry in the rotating tub may be one-sided to the inner or rear interior of the rotating tub.
  • a pair of auxiliary baffles axially opposed to each other have different axial dimensions respectively. More specifically, when the center of gravity is one-sided to one side relative to the axial center of the rotating tub, the auxiliary baffle disposed at an axial one side of the peripheral wall should have a smaller axial dimension than the auxiliary baffle disposed at the other side of the peripheral wall. However, each auxiliary baffle needs to be disposed in the region between the plane G passing the center of gravity and the end plate.
  • Each baffle may be made by pressing the peripheral wall or the end plate.
  • the auxiliary baffles may be formed integrally with the rotating tub, the number of assembly steps can be reduced.
  • each auxiliary baffle should not be limited to the shape of triangular pyramid but may be formed into the shape of a semicircular pyramid.
  • the invention may be a drum washing machine having an access opening in the front.
  • auxiliary baffles may be provided on a front part of the peripheral wall of the rotating tub so as to be located close to the front end plate of the rotating tub.
  • the rotating tub with an opening in the front is rotated about a rotational shaft provided on the rear thereof. Accordingly, when laundry gathers to the front interior in the rotating tub, the vibration caused by the rotating tub is increased and a large moment is applied to the rotational shaft or a shaft bearing.
  • the auxiliary baffles are provided on the front part of the peripheral wall of the rotating tub, the laundry can be prevented from gathering to the front interior of the rotating tub and accordingly, an occurrence of vibration can be suppressed.
  • the drum washing machine of the present invention can suppress occurrence of vibration, the drum washing machine is useful as a household washing machine used in a quiet environment.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
US10/587,072 2004-01-23 2004-12-09 Drum washing machine Abandoned US20070157677A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004015351A JP4387812B2 (ja) 2004-01-23 2004-01-23 ドラム式洗濯機
JP2004-015351 2004-01-23
PCT/JP2004/018386 WO2005071155A1 (ja) 2004-01-23 2004-12-09 ドラム式洗濯機

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US10/587,072 Abandoned US20070157677A1 (en) 2004-01-23 2004-12-09 Drum washing machine

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US (1) US20070157677A1 (ja)
JP (1) JP4387812B2 (ja)
KR (1) KR100790630B1 (ja)
CN (1) CN1906348A (ja)
TW (1) TWI260356B (ja)
WO (1) WO2005071155A1 (ja)

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US20110041565A1 (en) * 2009-08-24 2011-02-24 Samsung Electronics Co., Ltd. Washing machine, inner tub of washing machine and balancer connection and assembly method thereof
US20110061172A1 (en) * 2009-09-15 2011-03-17 Lg Electronics Inc. Method for washing and washing machine
US20120060350A1 (en) * 2009-05-28 2012-03-15 Kwon Ig Geun Manufacturing method of laundry machine
EP2631342A1 (en) * 2012-02-27 2013-08-28 Electrolux Home Products Corporation N.V. A laundry drum for a laundry treating machine
US11248331B2 (en) * 2017-11-08 2022-02-15 Lg Electronics Inc. Apparatus for treating laundry having a plurality of bent portions and controlling method thereof

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KR100634802B1 (ko) 2004-07-20 2006-10-16 엘지전자 주식회사 드럼 세탁기
JP4566112B2 (ja) * 2005-10-27 2010-10-20 三洋電機株式会社 衣類乾燥機
US7536882B2 (en) 2006-03-29 2009-05-26 Lg Electronics Inc. Drum type washing machine
JP4921104B2 (ja) * 2006-10-18 2012-04-25 日立アプライアンス株式会社 ドラム式洗濯機
JP2011072350A (ja) * 2009-09-29 2011-04-14 Hitachi Appliances Inc 洗濯機
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JP5852934B2 (ja) * 2012-07-10 2016-02-03 日立アプライアンス株式会社 ドラム式洗濯機およびドラム式洗濯乾燥機
CN104073646B (zh) * 2013-03-25 2017-08-25 三井金属矿业株式会社 脱气装置
CN107130396B (zh) * 2017-05-19 2019-08-27 珠海格力电器股份有限公司 洗衣机内筒及具有其的洗衣机
CN108866917B (zh) * 2018-05-25 2023-12-22 广州市信宏洗衣机械有限公司 一种适用于工业生产的洗衣机
CN111485392B (zh) * 2019-01-25 2023-08-01 青岛海尔洗衣机有限公司 一种应用于滚筒洗衣机的提升装置及滚筒洗衣机

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US20120060350A1 (en) * 2009-05-28 2012-03-15 Kwon Ig Geun Manufacturing method of laundry machine
US8782871B2 (en) * 2009-05-28 2014-07-22 Lg Electronics Inc. Manufacturing method of laundry machine
US20110041565A1 (en) * 2009-08-24 2011-02-24 Samsung Electronics Co., Ltd. Washing machine, inner tub of washing machine and balancer connection and assembly method thereof
US8984918B2 (en) * 2009-08-24 2015-03-24 Samsung Electronics Co., Ltd. Washing machine, inner tub of washing machine and balancer connection and assembly method thereof
US20110061172A1 (en) * 2009-09-15 2011-03-17 Lg Electronics Inc. Method for washing and washing machine
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EP2631342A1 (en) * 2012-02-27 2013-08-28 Electrolux Home Products Corporation N.V. A laundry drum for a laundry treating machine
US11248331B2 (en) * 2017-11-08 2022-02-15 Lg Electronics Inc. Apparatus for treating laundry having a plurality of bent portions and controlling method thereof

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TWI260356B (en) 2006-08-21
KR100790630B1 (ko) 2008-01-02
CN1906348A (zh) 2007-01-31
WO2005071155A1 (ja) 2005-08-04
TW200532068A (en) 2005-10-01
KR20060114367A (ko) 2006-11-06
JP2005204969A (ja) 2005-08-04
JP4387812B2 (ja) 2009-12-24

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