EP0403042B1 - Drum type washing machine - Google Patents

Drum type washing machine Download PDF

Info

Publication number
EP0403042B1
EP0403042B1 EP90250150A EP90250150A EP0403042B1 EP 0403042 B1 EP0403042 B1 EP 0403042B1 EP 90250150 A EP90250150 A EP 90250150A EP 90250150 A EP90250150 A EP 90250150A EP 0403042 B1 EP0403042 B1 EP 0403042B1
Authority
EP
European Patent Office
Prior art keywords
drum
peripheral wall
washing machine
rotary shaft
type 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.)
Expired - Lifetime
Application number
EP90250150A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0403042A1 (en
Inventor
Shoichi Nagoya Mach. Works Mitsubishi Hayashi
Hidetoshi Nagoya Mach. Works Mitsubishi Ishihara
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.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Publication of EP0403042A1 publication Critical patent/EP0403042A1/en
Application granted granted Critical
Publication of EP0403042B1 publication Critical patent/EP0403042B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D06F21/00—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement 
    • D06F21/02—Washing machines with receptacles, e.g. perforated, having a rotary movement, e.g. oscillatory movement  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
    • 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
    • D06F37/00—Details specific to washing machines covered by groups D06F21/00 - D06F25/00
    • D06F37/02—Rotary receptacles, e.g. drums
    • 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
    • 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

Definitions

  • the present invention relates to a centrifugal dehydrator in, for example, a dehydrating (washing) tank in a household washing machine, a washer for business, a dry cleaner and the like, or to various kinds of household and industrial laundry machines having a rotary drum tank adapted for a fully automatic washing, dehydrating and drying machine that performs washing, dehydration and drying in the same tank.
  • a dehydrating (washing) tank in a household washing machine, a washer for business, a dry cleaner and the like
  • various kinds of household and industrial laundry machines having a rotary drum tank adapted for a fully automatic washing, dehydrating and drying machine that performs washing, dehydration and drying in the same tank.
  • FIG. 4 An example of the conventional drum type washing machine is shown in FIG. 4 and FIG. 5.
  • FIG. 4 is a vertical sectional view containing the axis of rotation of the drum
  • FIG. 5 is a sectional along the line V-V in FIG. 4.
  • 1 is a control part for controlling the operation of the washing machine
  • 2 is a dial for operating the control part
  • 3 is a cover opened and closed for throwing in and taking out the laundry
  • 4 is an outer case
  • 5 is a rotary drum that constitutes the washing and dehydrating tank.
  • the peripheral wall 5a of the drum 4 there are provided numerous dehydrator holes 11 for separating water at the time of dehydration.
  • Reference numeral 8 shows an outer tank constituting the washing tank which has on its bottom part a drain pipe 13, a drain valve 18, and further, a motor 12 and a speed changer 26. Further, the rotary drum 5 is fitted to the outer tank 8 with the shafts 19 and 27 projecting from the center of the rear and the front end walls 5b and 5c, respectively, via the bearings 21 and 28. The drum 5 is rotated by receiving the rotation of the speed changer 26 via a pulley 15 provided on the front side shaft 27, a belt 17 and a pulley 16.
  • a suspension rod for supporting the outer tank 8 7 is a spring and 20 is a leg attached to the bottom surface of the outer case 4.
  • water is fed from a feed water electromagnetic valve or the like that is not shown to the outer tank 8 and to the interior of the drum 5, water supply is stopped when the water level attained a predetermined level by detecting it with a pressure sensor that is not shown, and at the same time the rotary drum 5 is rotated by energizing the motor 12.
  • the height of the lifters 9, 10, 29 and 30 varies conspicuously as one moves along the direction of the shaft, and the direction of the height ch ange is set to be opposite alternately, the reshuffling, bending and stretching, and rubbing actions of clothes are enhanced in addition to the impact action due the falling of the clothes as a result of conspicuous action of the difference in the strengths of lifting the clothes. Accordingly, the cleaning power of the machine is enhanced markedly compared with the existing general drum type washing machine.
  • the above-mentioned washing machine has the merit of turning over the laundry within the drum back and forth with respect to the shaft direction of the drum, the laundry tends to be distributed unevenly with respect to the center of gravity of the drum so that there is a shortcoming in that the vibrations of the drum due to the unbalance becomes excessive during the washing, especially during the dehydration process where the rotational speed of the drum is large.
  • the rotary drum is supported by the inboard style in order to reduce the bearing load, with no success in reducing the vibrations of the drum main body.
  • the drum is inboard supported as in this machine it becomes necessary to take in and out the laundry from above through a narrow opening, which obstruct the operability markedly.
  • This patent refers to a drum for a drum machine that consists of two parts that are joined together by help of flanches. It relates to improvements in exchange of a washing liquid between the inside of a drum and a washing tub surrounding the inside of the drum.
  • the present invention has a drum according to claim 1.
  • the lanundry within the drum are lifted upward by the beaters at the time of rotation of the drum in the washing process, collected due to the trough shape of the beater form to the central part of the drum where the laundry falls off. Since the laundry incessantly changes its front and back sides in this manner within the drum, it becomes possible to obtain a high cleaning power.
  • the drum is given the so-called abacus bead orm and is set so as to have its center located near the central part of the elastic support, so that it always holds the laundry at a position close to its center of gravity. Accordingly, it is possible to reduce the unbalance in the distribution of the laundry and suppress the generation of vibrations even at the time of high-speed rotation of the drum. Moreover, since the drum is by design supported in cantilever fashion, it becomes possible to provide an opening for easy bringing in and taking out of the laundry in the front panel of the washing machine, whereby enhancing the operability of the machine.
  • FIG. 1 is a vertical sectional view of the typical embodiment of the drum type washing machine in accordance with the present invention
  • FIG. 2 is its front view.
  • the form of the drum in accordance with the present embodiment is circular for a perpendicular cross-section at any point of the rotary shaft, and in a cross-section containing the axis of rotation, the peripheral wall of the drum and the axis of rotation of the drum make a predetermined angle.
  • 31 in the figure is the rotary drum whose outer form is just like that of an abacus bead obtained by mutually joining the large-diameter portions of two truncated cones.
  • the drum 31 has a rotary shaft 33 on its rear surface (left side of FIG. 1) 31a, and is supported in cantilever style by a drum support 38 via a bearing 38a while keeping the shaft 33 substantially horizontally.
  • a pulley 34 is fixed to the rotary shaft 33, and the rotary shaft 33 and hence the drum 31 also are driven to rotate via a transmission path a driving V belt 35 and a driving pulley 36 fixed to the motor 37.
  • Reference numeral 32 is an outer tank arranged so as to enclose the drum 31, having the drum support 38 for supporting the drum rotary shaft 33 on its rear wall 32a, and has fixed at a part of blowing part (omitted from the figure) for supplying water, steam, hot air and the like.
  • an opening 32c is formed on the front wall 32b of the outer tank 32 for supplying and removing the laundry into and from the interior of the drum 31, and a door 39 is attached to the opening 32c.
  • the motor 37 which is the power source for driving the drum 31 as in the above, is installed in the lower part of the outer tank 32, and its rotation speed is appropriately set by means of the speed varying device 50.
  • Reference numeral 40 is the peripheral wall of the drum 31 in which are provided a multitude of holes 44 of diameter of about several millimeters for letting water pass through, the cross section of the peripheral wall 40 in the direction perpendicular to the rotary shaft is circular, and has a ridge form of angle ⁇ with its central part projected outward with respect to the shaft direction.
  • Reference numeral 42 is the laundry (items to be washed) which consists of fabric products such as sheets, towels, shirts and the like that is to be washed and dehydrated.
  • Reference numeral 43 is a beater consisting of a plate, and a plurality of them are installed on the inner surface of the peripheral wall 40 of the drum 31 arranged centripetally extending in the direction of the rotary shaft, acting to lift the laundry 42 upward as the drum 31 rotates.
  • the beater 43 which constitutes a component of the present invention has the form as shown in FIG. 1, namely, has a predetermined height H from the inner surface of the peripheral wall 40, and has the form of a trough with angle ⁇ ′ which is equal to or greater than the angle ⁇ of the peripheral wall 40 when seen from the interior of the drum.
  • FIG. 3 shows the various forms of the beaters to be installed on the peripheral wall 40.
  • FIG. 3(a) shows the beater 43a in accordance with the present invention
  • FIGS. 3(b) and 3(c) show beaters 43b and 43c installed for the purpose of comparison.
  • the beater 43b is a horizontal beater which has the form of an isosceles triangle of the apex angle ⁇ with its base parallel to the axis of rotation
  • the beater 43c is a ridge type beater whose plane is approximately a rhombic form with an apex projecting out toward the axis of rotation.
  • the drum 31 and the outer tank 32 are suspended on a spring 51 for preventing vibrations.
  • Reference numeral 45 is a balance weight attached to the upper part of the outer tank 32 which has a weight to balance the motor 37 installed on the lower part of the outer tank 32.
  • the balance weight 45 the large-diameter part at the center of the drum 31 is disposed substantially at the central part of the spring 51 for elastically supporting the outer tank 32, whereby enabling to keep the position of the center of gravity.
  • a feed water pipe 46 for feeding water for washing to the interior of the drum 31 is connected to the top surface of the outer tank 32, and a drainage pipe for draining water in the outer tank 32 by opening and closing a damper 48 in the midst of the washing process or in the dehydration process, is provided at the central lower part of the drum 31 of the outer tank 32.
  • the damper 48 is opened at the time of draining from the outer tank 32 to discharge the drain to a drainage ditch 49 on the outside of the machine.
  • the rotation speed of the motor 37 is adjusted by means of speed varying device 50, and the rotation speed of the motor 37 is controlled so as to rotate the drum 31 at respective optimum speeds in the washing and the dehydration processes.
  • a predetermined quantity of water is fed from the feed water pipe 46 to the inside of the drum 31 and the outer tank 32. Since numerous holes 44 are provided in the peripheral wall 40 of the drum 31, water supplied to the interior of the drum 31 passes through the holes 44 and is collected in the interior of the outer tank 32, with the water level in the drum 31 rising gradually. Water feeding is stopped when the water level checked by a water level detector which is not shown reaches a predetermined level. When the water feeding is completed the door 39 is and the laundry is supplied to the inside of the drum 31.
  • the motor 37 is started, and the drum 31 is rotated at a predetermined speed. Repeating the rotation of the drum 31 in the forward and the reverse directions is effective in preventing the entanglement of the laundry 42. It should be noted that the optimum number of revolution is 0.6 to 0.8G.
  • a preliminary washing is carried out by supplying a detergent and an auxiliary to the drum 31 from a supply device of a detergent, an auxiliary and the like that is not shown.
  • wash water used for the preliminary washing is discharged to the drainage ditch 49 via the drainage pipe 47 by opening the damper 48, and the damper 48 is closed after the elapse of a predetermined time or by detecting the completion of draining of the water for the preliminary washing with a sensor that is not shown.
  • washing water is fed again into the drum 31 to a predetermined level in the same way as in the above, and a detergent and an auxiliary are supplied into the drum 31 from a detergent and auxiliary supplying device which is not shown.
  • steam is blown into water in the outer tank 32 by activating a steam nozzle which is not shown to raise the temperature of the water for washing to a predetermined level.
  • the rotation of the drum 31 is controlled by means of the speed changing device 50 through control of the rotation speed of the motor 37.
  • Soil on the laundry 42 is removed by the action a mechanical force or the like which is generated by the impact of the laundry 42 with the water surface when the laundry is lifted by the beaters 43 to the upper part of the drum 31 and let it drop from there.
  • the laundry is washed in warm water, then the wash water absorbed in the laundry 42 is shaken off by centrifugal force by rotating the drum 31 at a medium speed.
  • the wash water is drained to the outside of the washing machine through the drainage pipe 47 by opening the damper 48.
  • the ridge type beater 43a adopted in the present invention is preferable as the form of the beater 43, and it is found as the result of a test that the adequate height of the beater 43a is 8 to 14% of the drum diameter.
  • clean water is fed again into the drum 31 by closing the damper 48 to carry out the rinsing process.
  • the rinsing process can be performed in the same way as for the washing process.
  • the rinsing process in which feeding and draining of rinsing water are repeated it proceeds to the dehydration process.
  • the drum 31 is rotated at a speed to produce an acceleration of 1.0 to 1.5G on the inner circumference of the drum by the control that uses, the speed varying device 50. This is for distributing the laundry 42 nearly uniformly over the inner circumferential surface of the drum 31 as mentioned earlier.
  • the drum 31 is rotated at a high speed to drain the water attached to the laundry 42 through the holes 44 of the drum 31 by the centrifugal force. The water flows from the outer tank 32 through the drainage pipe 47 and the drainage ditch 49 and is drained to the outside of the machine.
  • the drum is supported in cantilever style so that the bringing in and the taking out of the laundry becomes easy which enhances the operability of the machine.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Main Body Construction Of Washing Machines And Laundry Dryers (AREA)
  • Detail Structures Of Washing Machines And Dryers (AREA)
  • Treatment Of Fiber Materials (AREA)
EP90250150A 1989-06-16 1990-06-08 Drum type washing machine Expired - Lifetime EP0403042B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP1153696A JP2738957B2 (ja) 1989-06-16 1989-06-16 ドラム式洗濯機
JP153696/89 1989-06-16

Publications (2)

Publication Number Publication Date
EP0403042A1 EP0403042A1 (en) 1990-12-19
EP0403042B1 true EP0403042B1 (en) 1996-09-04

Family

ID=15568130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90250150A Expired - Lifetime EP0403042B1 (en) 1989-06-16 1990-06-08 Drum type washing machine

Country Status (4)

Country Link
EP (1) EP0403042B1 (ko)
JP (1) JP2738957B2 (ko)
KR (1) KR930001630B1 (ko)
DE (1) DE69028352T2 (ko)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2554074Y2 (ja) * 1991-05-10 1997-11-12 三菱重工業株式会社 連続式水洗機
JPH09313766A (ja) * 1996-01-31 1997-12-09 Sharp Corp ドラム式乾燥洗濯機、ドラム式乾燥機およびドラム式乾燥洗濯機の動作方法
ITMC20060162A1 (it) * 2006-11-28 2008-05-29 Meccanica Generale Srl Cestello per lavatrici in grado di evitare il danneggiamento della biancheria in esso caricata.
JP4978712B2 (ja) * 2010-04-22 2012-07-18 パナソニック株式会社 洗濯機
CN108796996B (zh) * 2018-06-29 2023-07-14 珠海格力电器股份有限公司 内筒、滚筒洗衣机以及滚筒干衣机
PL3715522T3 (pl) * 2019-03-26 2022-09-12 Electrolux Appliances Aktiebolag Bęben piorący do urządzenia do prania pranych artykułów i urządzenie do prania pranych artykułów wyposażone w taki bęben

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2330421A (en) * 1941-02-27 1943-09-28 Murray Corp Cylinder construction
AT383626B (de) * 1985-04-10 1987-07-27 Steininger Eudorawerke Trommel fuer trommelwaschmaschinen
JPH0675628B2 (ja) * 1987-07-29 1994-09-28 三菱重工業株式会社 洗濯・乾燥機
DE3728361A1 (de) * 1987-08-25 1989-03-09 Bosch Siemens Hausgeraete Verfahren zum waschen von waesche in einer waschmaschine, und waschtrommel zur ausuebung des verfahrens
DE68929146T2 (de) * 1988-02-23 2000-07-06 Churyo Engineering K.K., Nagoya Trommelwaschmaschine mit Vorrichtung zum Entladen von Wäsche

Also Published As

Publication number Publication date
DE69028352D1 (de) 1996-10-10
EP0403042A1 (en) 1990-12-19
JPH0318398A (ja) 1991-01-25
KR910001142A (ko) 1991-01-30
KR930001630B1 (ko) 1993-03-08
DE69028352T2 (de) 1997-02-06
JP2738957B2 (ja) 1998-04-08

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