US20140109628A1 - Drum washing machine - Google Patents

Drum washing machine Download PDF

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Publication number
US20140109628A1
US20140109628A1 US14/008,440 US201214008440A US2014109628A1 US 20140109628 A1 US20140109628 A1 US 20140109628A1 US 201214008440 A US201214008440 A US 201214008440A US 2014109628 A1 US2014109628 A1 US 2014109628A1
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US
United States
Prior art keywords
tub
spring
drum
cabinet
coupled
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
US14/008,440
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English (en)
Inventor
Ui Kun HWANG
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.)
WiniaDaewoo Co Ltd
Original Assignee
Dongbu Daewoo Electronics 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 Dongbu Daewoo Electronics Corp filed Critical Dongbu Daewoo Electronics Corp
Assigned to DONGBU DAEWOO ELECTRONICS CORPORATION reassignment DONGBU DAEWOO ELECTRONICS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HWANG, UI KUN
Publication of US20140109628A1 publication Critical patent/US20140109628A1/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 
    • D06F23/02—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 a horizontal axis
    • 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
    • F16F15/04—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 elastic means
    • 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
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • 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
    • D06F37/206—Mounting of motor
    • 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
    • D06F37/265—Counterweights mounted to the tub; Mountings therefor

Definitions

  • the present invention relates to a drum washing machine, and more particularly, to a drum washing machine capable of decreasing vibrations by using a plurality of springs having different spring constants.
  • a washing machine uses power from an electric motor as main power and performs washing, rinsing, and dehydrating processes so as to remove stains on laundry.
  • the washing machine includes an electric motor, which is a power apparatus, a mechanical part that transfers energy to the laundry, a controlling part controlling the washing process, a water supply apparatus, a water draining apparatus, and the like.
  • Washing machines are classified into agitator type washing machines, pulsator type washing machines, and drum type washing machines, depending on their washing scheme.
  • the agitator type washing machine performs washing by horizontally rotating a spiral agitator at the center of a tub.
  • the pulsator type washing machine performs washing using a water flow generated by rotating a disk shaped pulsator.
  • the drum type washing machine performs washing using impact generated when the laundry is lifted by a lifter in the drum and then dropped into the wash water and detergent into the drum provided with several protrusion parts and then rotating the drum around a horizontal axis.
  • the present invention is conceived to solve such problems of the related art, and an aspect of the present invention is to provide a drum washing machine capable of decreasing vibrations by using a plurality of springs having different spring constants.
  • a drum washing machine includes: a cabinet; a tub in the cabinet and fillable with wash water; a rotatable drum in the tub and receiving laundry therein; a motor at the rear of a lower portion of the tub and generating power; a motor pulley connected to the motor; a drum pulley connected to the drum; a belt having one side wound around the motor pulley and another side wound around the drum pulley so that the motor rotates the drum; a balancer coupled to a front surface of the tub; a plurality of springs having one end coupled to the cabinet and another end coupled to an upper surface of the tub to support the tub; and a plurality of dampers having one end coupled to the cabinet and another end coupled to a lower surface of the tub, wherein the springs include one spring coupled to one side of the cabinet and another spring coupled to an opposite side of the cabinet, the one spring having a spring constant different from that of the other spring.
  • the spring constant of the one spring may be larger than that of the other spring.
  • the one spring may have a length greater than that of the other spring.
  • the one spring and the other spring may have the same length to support the tub.
  • the dampers may include one damper coupled to one side of the cabinet and another damper coupled to an opposite side of the cabinet, wherein the one damper has a frictional force different from that of the other damper.
  • the frictional force of the one damper may be larger than that of the other damper.
  • vibrations may be decreased using one balancer, the assembling process and the manufacturing cost may be decreased.
  • vibrations of the tub may be effectively absorbed by the springs.
  • vibrations of the tub may be effectively damped by the dampers.
  • a vertical direction change of the movement of the tub due to a spring constant difference between the springs and a frictional force difference between the dampers may be maximized, such that a damping rate for the vibrations of the tub may be further improved.
  • FIG. 1 is a side cross-sectional view of a drum washing machine in accordance with an embodiment of the present invention
  • FIG. 2 is a perspective view of the drum washing machine in accordance with one embodiment of the present invention.
  • FIG. 3 is a front view of the drum washing machine in accordance with an embodiment of the present invention.
  • FIG. 4 is a bottom perspective view of the drum washing machine in accordance with an embodiment of the present invention.
  • FIG. 5 is a view illustrating an operation state of the drum washing machine in accordance with an embodiment of the present invention.
  • FIG. 1 is a side cross-sectional view of a drum washing machine in accordance with an embodiment of the present invention
  • FIG. 2 is a perspective view of the drum washing machine in accordance with an embodiment of the present invention
  • FIG. 3 is a front view of the drum washing machine in accordance with an embodiment of the present invention
  • FIG. 4 is a bottom perspective view of the drum washing machine in accordance with an embodiment of the present invention
  • FIG. 5 is a view illustrating an operation state of the drum washing machine in accordance with an embodiment of the present invention.
  • the drum washing machine 1 includes a cabinet 10 that forms an appearance of the drum washing machine 1 , a tub 20 positioned between front and rear plates (based on FIG. 1 ) of the cabinet 10 and fillable with wash water, a rotatable drum 30 positioned in the tub 20 and receiving laundry therein, a driving part 40 generating power to rotate the drum 30 , a balancer 50 coupled to a front surface of the tub 20 , springs 60 that absorb vibrations of the tub 20 , and a damper 70 that dampens the vibrations of the tub 20 .
  • the front plate of the cabinet 10 is provided with a laundry entrance hole (not illustrated) through which laundry is introduced and discharged and a door (not illustrated) opening or closing the laundry entrance hole.
  • the tub 20 is mounted in the cabinet 20 and has a hollow cylindrical shape that is laid laterally.
  • the rear of the laundry entrance hole has an opening hole (not illustrated).
  • An upper portion of the tub 20 is provided with a water supplying apparatus (not illustrated) that supplies the wash water into the tub 20 and a detergent housing (not illustrated) that supplies a detergent.
  • the tub 20 has the rotatable drum 30 disposed therein.
  • the drum 30 has a hollow cylindrical shape that is laterally laid, similar to the tub 20 , and includes opening holes (not illustrated) at the rear of the laundry entrance hole.
  • the drum 30 has holes (not illustrated) in the side thereof so that the wash water filled in the tub 20 may be introduced thereinto and discharged therefrom and has a lifter on an inner circumferential surface thereof so as to move the laundry.
  • the driving part 40 generates the power to rotate the drum 30 .
  • the driving part 40 includes a motor 41 , a motor pulley 42 , a drum pulley 43 , and a belt 44 .
  • the motor 41 is disposed at the rear of a lower portion of the tub 20 (see FIG. 1 ) and generates the power.
  • the motor pulley 42 is connected to the motor 41
  • the drum pulley 43 is connected to the drum 30
  • the belt 44 has one side wound around the motor pulley 42 and the other side wound around the drum pulley 43 .
  • a rotational force generated by the motor 41 is transferred to the motor pulley 42 . Then, the rotational force is transferred to the drum pulley 42 at the rear of the drum 30 through the belt 44 , and the drum 30 is rotated.
  • the motor pulley 42 and the drum pulley 43 have grooves in central portions thereof to prevent the belt 44 from separating from the pulleys.
  • the balancer 50 includes a body having a predetermined mass and a housing having an internal space to guide movement of the body, in order to rapidly decrease these vibrations.
  • the balancer 50 is coupled to the front surface of the tub 20 (see FIG. 1 ).
  • the reason why the balancer 50 is coupled to the front surface of the tub 20 as described above is to correspond to the motor 41 at the rear of the tub 20 . That is, since the motor 41 having a weight is at the rear of the tub 20 , the balancer 50 is positioned on the front surface of the tub 20 in order to eliminate a weight unbalance due to the weight of the motor 41 .
  • the motor 41 is biased toward the left of the tub 40 (based on FIG. 4 ).
  • the balancer 50 is positioned so that the center of gravity thereof is biased toward the right, opposite to the motor 41 , to correspond to the biasing toward one side. Therefore, the tub 40 is horizontally balanced by biasing the motor 41 toward the left and biasing the center of gravity of the balancer 50 toward the right.
  • the balancer 50 has a shape that enables the center of gravity thereof to be biased toward the right.
  • the balancer 50 may also have another shape in addition to the above-mentioned shape as long as the center of gravity thereof is biased toward the right.
  • the springs 60 have an upper end coupled to an upper end portion of a side plate of the cabinet 10 and a lower end coupled to an upper surface of the tub 20 . Therefore, the springs 60 support the tub 20 and absorb the vibrations of the tub 20 that occur at the time of a dehydration cycle.
  • the number of springs 60 is plural. The same number of springs 60 are mounted on the left and right of the tub 20 to absorb the vibrations generated due to horizontal and vertical movement of the tub 20 . Although one spring 60 is mounted on each of the left and right of the tub 20 in the present embodiment, the present invention is not limited thereto.
  • the springs 60 are coupled to the upper surface of the tub 20 at a center of gravity of the tub 20 .
  • the center of gravity of the tub 20 means the center of gravity when the balancer 50 and the motor 41 are mounted on the tub 20 , rather than the center of gravity of only the tub 20 itself.
  • the spring 60 is positioned at the center of gravity of the tub 20 so that the tub 20 is balanced in the front-to-rear direction.
  • the lower end of the spring 60 is coupled to the tub 20 at the center of gravity of the tub 20 in the front-to-rear direction
  • the upper end of the spring 60 is coupled to the cabinet 10 at the same position in the front-to-rear direction as that of the lower end of the springs 60 (see FIG. 1 ).
  • a spring 60 coupled to the left (based on FIG. 3 ) of the tub 20 is referred to as one spring 60 A, and a spring 60 coupled to the right of the tub 20 is referred to as the other spring 60 B.
  • a spring constant of one spring 60 A is different from that of the other spring 60 B.
  • the spring constant is a constant indicating a proportional relationship between a force acting on the spring and a change of length of the spring. As the spring constant becomes larger, a larger force is required to extend the spring. In the present embodiment, the spring constant is adjusted by the number of windings of the spring 60 .
  • the spring constant of one spring 60 A is larger than that of the other spring 60 B. Therefore, when the same force acts on one spring 60 A and the other spring 60 B, the other spring 60 B extends further, as compared with the one spring 60 A.
  • an extension length of the other spring 60 B is larger than that of the one spring 60 A.
  • one spring 60 A has a length greater than that of the other spring 60 B.
  • one spring 60 A since one spring 60 A has a spring constant larger than that of the other spring 60 B, when the drum 30 is not rotated, that is, when a washing cycle is not performed, the length of one spring 60 A should be greater than that of the other spring 60 B, based on the case in which force is not applied to one spring 60 A and the other spring 60 B in order to horizontally balance the tub 20 .
  • a weight of the balancer 50 is greater than that of the motor 41 .
  • the weight of the motor 41 is about 5 kg, and the weight of the balancer 50 is about 9 kg.
  • the center of gravity of the tub 20 on which both of the motor 41 and the balancer 50 are mounted is in front of the center of a front and rear length l of the tub 20 .
  • the springs 60 are coupled to the upper surface of the tub 20 at a position ahead of the center of the front and rear length l of the tub 20 .
  • the dampers 70 have an upper end coupled to the lower surface of the tub 20 and a lower end coupled to a lower surface plate of the cabinet 10 . Therefore, the dampers 70 damp the vibrations of the tub 20 during the dehydration cycle.
  • the number of dampers 70 is plural. In the present embodiment, two dampers 70 are provided, in which one damper is coupled to the left and the right of the tub 20 , respectively, to dampen the vibrations due to horizontal and vertical movement of the tub 20 .
  • the dampers 70 are coupled to the lower surface of the tub 20 behind the springs 60 (see FIG. 1 ). In accordance with the present embodiment, the dampers 70 are coupled to the lower surface of the tub 20 at the center along the front-to-rear length l of the tub 20 .
  • the dampers 70 are positioned behind the center of gravity of the tub 20 to dampen the relatively large vibrations at the rear of the tub 20 , thereby making it possible to further improve a vibration damping effect.
  • the dampers 70 When the dampers 70 are excessively close to the rear of the tub 20 , the damping rate for vibrations at the front of the tub 20 decreases. Thus, the dampers 70 are located at the center along the front-to-rear length l of the tub 20 so as to dampen the vibrations at both of the front and the rear of the tub 20 .
  • a damper 70 coupled to the left side (based on FIG. 3 ) of the tub 20 is referred to as one damper 70 A
  • a damper 70 coupled to the right side of the tub 20 is referred to as the other damper 70 B
  • the frictional force of one damper 70 A is different from that of the other damper 70 B.
  • the frictional force is calculated by the product of normal force and the friction factor of an object. The larger the frictional force, the larger the force required to compress the damper 70 . More specifically, the frictional force of one damper 70 A is larger than that of the other damper 70 B. Therefore, when the same force acts on one damper 70 A and the other damper 70 B, the other damper 70 B is compressed further than the one damper 70 A.
  • a compression length of the other damper 70 B is larger than that of one damper 70 A.
  • the lifter 35 is on the inner circumferential surface of the drum 30 toward a central portion of the drum 30 .
  • the lifter 35 lifts the laundry in the drum 30 as the drum 30 rotates.
  • an operating panel (not shown) is operated to operate the drum washing machine 1 .
  • the wash water is supplied to the tub 20 and is also introduced into the drum 30 through the holes.
  • the motor 40 is driven to rotate the drum 30 , and the laundry in the drum 30 is lifted by the lifter 35 fixed to the inner circumferential surface of the drum 30 and then drops down.
  • the vibrations generated during rotation of the drum 30 are decreased by the springs 60 and the dampers 70 , in addition to the balancer 50 .
  • the springs 60 are positioned ahead of the center of the front-to-rear length l of the tub 20 when there is a weight difference between the balancer 50 and the motor 41 to maintain of the balance of the tub 20 in the front-to-rear direction.
  • the dampers 70 are coupled to the tub 20 behind the springs 60 to offset an increase in vibrations at the rear of the tub 20 caused by a forward movement of the center of gravity of the tub 20 .
  • the springs 60 are divided into one spring 60 A and the other spring 60 B to induce a movement of the tub 20 in a vertical direction during the dehydration cycle. Since the spring constant of the other spring 60 B is smaller than that of one spring 60 A, the right of the tub 20 to which the other spring 60 B is mounted is further moved vertically as compared with the left of the tub 20 to which one spring 60 A is mounted during the dehydration cycle, in which the drum 30 is rotated in a counterclockwise direction.
  • a rotation trajectory of the tub has substantially a circle shape.
  • a rotation trajectory of the tub 20 has substantially an oval shape in which the vertical length is greater than the horizontal length.
  • the dampers 70 are divided into one damper 70 A and the other damper 70 B to induce the movement of the tub 20 in the vertical direction at the time of the dehydration cycle. Since the frictional force of the other damper 70 B is smaller than that of one damper 70 A, the right of the tub 20 to which the other damper 70 B is mounted is further moved vertically as compared with the left of the tub 20 to which one damper 70 A is mounted during the dehydration cycle, in which the drum 30 is rotated in the counterclockwise direction.
  • a rotation trajectory of the tub has substantially a circle shape.
  • a rotation trajectory of the tub 20 has substantially an oval shape in which the vertical length is greater than the horizontal length.

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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)
US14/008,440 2011-03-28 2012-03-27 Drum washing machine Abandoned US20140109628A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2011-0027485 2011-03-28
KR20110027485 2011-03-28
PCT/KR2012/002214 WO2012134143A2 (fr) 2011-03-28 2012-03-27 Machine à laver à tambour

Publications (1)

Publication Number Publication Date
US20140109628A1 true US20140109628A1 (en) 2014-04-24

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Application Number Title Priority Date Filing Date
US14/008,440 Abandoned US20140109628A1 (en) 2011-03-28 2012-03-27 Drum washing machine

Country Status (5)

Country Link
US (1) US20140109628A1 (fr)
EP (1) EP2692933A4 (fr)
KR (1) KR20120110045A (fr)
CN (1) CN103459704A (fr)
WO (1) WO2012134143A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017056076A (ja) * 2015-09-18 2017-03-23 パナソニックＩｐマネジメント株式会社 ドラム式洗濯機

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110761028B (zh) * 2019-10-10 2023-06-30 无锡小天鹅电器有限公司 衣物处理装置

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US20020016997A1 (en) * 2000-05-25 2002-02-14 Joakim Jonsson Low-speed prebalancing for washing machines
US20060011429A1 (en) * 2004-07-13 2006-01-19 Lg Electronics Inc. Damper for damping vibration and washing machine having the same

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US20060011429A1 (en) * 2004-07-13 2006-01-19 Lg Electronics Inc. Damper for damping vibration and washing machine having the same

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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
CN103459704A (zh) 2013-12-18
EP2692933A4 (fr) 2015-01-14
KR20120110045A (ko) 2012-10-09
WO2012134143A3 (fr) 2013-01-10
WO2012134143A2 (fr) 2012-10-04
EP2692933A2 (fr) 2014-02-05

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Date Code Title Description
AS Assignment

Owner name: DONGBU DAEWOO ELECTRONICS CORPORATION, KOREA, REPU

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HWANG, UI KUN;REEL/FRAME:031302/0336

Effective date: 20130925

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION