GB2392923A - Washing machine with ultrasonic means - Google Patents
Washing machine with ultrasonic means Download PDFInfo
- Publication number
- GB2392923A GB2392923A GB0220539A GB0220539A GB2392923A GB 2392923 A GB2392923 A GB 2392923A GB 0220539 A GB0220539 A GB 0220539A GB 0220539 A GB0220539 A GB 0220539A GB 2392923 A GB2392923 A GB 2392923A
- Authority
- GB
- United Kingdom
- Prior art keywords
- generating means
- ultrasonic wave
- wave generating
- wash
- submersible
- 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
Links
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
- D06F19/00—Washing machines using vibrations for washing purposes
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Detail Structures Of Washing Machines And Dryers (AREA)
- Accessory Of Washing/Drying Machine, Commercial Washing/Drying Machine, Other Washing/Drying Machine (AREA)
Abstract
A wash basket 14 is located in a cylindrical wash tub 15 of a laundry machine 10. A sidewall 16 of the basket contains two submersible housings 30 and 32 for locating a bank of ultrasonic transducers 34 and 36. The submersible housings consist of an elongate chamber with a rhomboidal cross-section. A generator 56 produces ultrasonic waves emitted by an active face 40 and 42 of the transducers into a wash liquid. The transducers may be piezoelectric and power may be delivered to the generator by means of a commutator. The wash basket of the machine may be mounted on a vertical or horizontal axis.
Description
DESCRIPTION
WASHING MACHINE
The present invention relates to washing machines. In particular, the present invention relates to laundry washing machines.
The vast majority of laundry washing machines utilise the surface active effects of a detergent in combination with mechanical means, such as an agitator, which agitate the laundry within the machine.
The general construction of laundry washing machines is well known in the art. A common type of machine is the vertical axis washer, having an agitator and incorporating a submersion process for laundering clothes. An irnperforate tub is disposed in a perforated wash basket for receiving laundry and the tub is filled with a wash liquid of detergent and water. An oscillating or unidirectional agitator is positioned within the wash basket and imparts mechanical forces to the submerged laundry. Agitators commonly have fins or vanes extending radially which assist in pushing the clothes in a circular direction and impart mechanical forces to the swirling wash liquid. Alternatively, in horizontal axis washers, the agitator may form an integral part of the side wall of the wash basket, and the wash basket rotates within the tub to agitate the laundry.
In an effort to improve the efficiency ofthe wash process, manufacturers have employed a number of methods, such as improving the cleating activity of the detergent, increasing the quantity of the detergent used, extending the washing cycle and increasing the agitation of the laundry by the agitator.
However each of these methods have significant drawbacks. For example, increasing the agitation of the laundry by the agitator gives rise to increased fabric abrasion and can lead to vane and/or fin breakage; improving the chemical activity of the wash detergent can also lead to increased fabric degradation; and, increasing the quantity of detergent used increases environmental impact of such environmentally harmful substances. Furthermore, a build up of undissolved detergent can lead to the blockage of waste stream pipes.
More recently, manufacturers have looked for alternative solutions. One means by which they have sought to overcome the drawbacks is by the use of ultrasonic wave generating devices. Ultrasonic wave generating devices degas the wash liquid whereby any gas present in the wash liquid, ea. oxygen, is driven out of the liquid and in so doing further agitates the laundry and further aids dispersion of the detergent.
US 5,309,739 teaches the use of an ultrasonic wave generating device and an ultrasonic vibrator which is fixed to the outer wall of the bottom of a wash tub in a vertical axis washer. Laundry is loaded into a wash basket disposed in the wash tub and ultrasonic waves are generated and transmitted to the contents of the wash tub via an ultrasonic vibrator.
The ultrasonic vibrator is mounted on the bottom ofthe washing tub to ensure that the device is always adjacent to the wash liquid. It is well documented that ultrasonic devices will over-heat if they are not adjacent to the wash liquid.
Often such improved machines provide only a slightly better washing result
than conventional machines despite being significantly more expensive and more complex to manufacture. Furthermore, known laundry washing machines assisted by ultrasonic wave generation devices are all vertical axis washers which are loaded with laundry from a loading door disposed in the top panel ofthe machine, so called "top loaders", whereas the vast majority of washing machines are horizontal axis washers which have the loading door in the front wall ofthe machine, so called "front loaders". Laundry washing machines are typically front loaders because they are often disposed below a work surface which would prevent access to the loading door in vertical axis washers.
The use of ultrasonic wave generating devices in front loaders is not considered suitable because manufacturers have found it difficult to prevent wash liquid, excited by ultrasonic waves, from escaping the wash tub when a front loading machine is used. Typically in front loaders excited wash liquid escapes through seals between the loading door and the wash tub. Furthermore, it is not possible in known horizontal axis washing machines to ensure that the ultrasonic vibrator plate is adjacent to the wash liquid to prevent over-heating and that it is in close proximity to the laundry to ensure maximum efficacy of signal transduction.
To improve the washing effect, the wash baskets of such machines are often coated with a ceramic material, such as tourmaline, to help form hydroxide ions to aid in dispersing the detergent. The action of the ultrasonic vibrator can cause degradation to the ceramic coating which may result in cracking owing to its position on the outer wall of the wash tub.
- 4 Additionally, with horizontal axis machines, the inventor has experienced further problems in providing a power supply to the ultrasonic generating means and this problem has not been addressed before.
It is an object of the present invention to overcome or alleviate one or more of the problems associated with the prior art.
In accordance with a first aspect of the present invention, there is provided an apparatus for washing laundry comprising a wash basket for receiving wash liquid, rotatably mounted about a central axis and at least one ultrasonic wave generating means for generating ultrasonic waves in the wash liquid, rotatable with the wash basket.
Arranging the ultrasonic wave generating means such that it is rotatable with the wash basket ensures maximum efficacy in signal transduction because the ultrasonic wave generating means can be disposed nearer to the laundry items which are suspended in the wash liquid. Thus less powerful ultrasonic wave generating means can be used to achieve the effect attained by known washing machines having ultrasonic wave generating means.
The wash basket may comprise a substantially cylindrical or conical member.
Preferably, the wash basket comprises a substantially cylindrical member.
l he ultrasonic wave generating means may comprise at least one active face from which ultrasonic waves are emitted.
Preferably, the apparatus comprises two ultrasonic wave generating means.
The ultrasonic wave generating means may comprise at least one transducer.
- 5 Preferably, the transducer is a piezoelectric transducer.
Preferably, power is delivered to the ultrasonic wave generating means by means of a commutator. The commutator enables power to be delivered to the ultrasonic wave generating means whilst permitting the wash basket to rotate freely.
The ultrasonic wave generating means may be disposed within one or more submersible compartments or housings capable of housing the ultrasonic generating means whilst acting as a water impermeable barrier between the ultrasonic wave generating means and the wash liquid.
The one or more submersible housings may be mounted to an inner wall of the wash basket or may form an integral part of the inner wall. Preferably, the one or more submersible housings are releasably mounted to the inner wall to facilitate easy repair and/or replacement.
Preferably, the apparatus comprises two submersible housings. The submersible housings may be disposed radially about the wash basket. Preferably, the angle subtended between the submersible housings is 180 or less, more preferably, about 120 or less.
The apparatus may comprise an agitator. The agitator may comprise the one or more submersible housings and/or fins and/or vanes. Preferably, the fins and/or vanes are flexible to prevent significant fabric abrasion.
The ultrasonic wave generating means may be mounted in the one or more submersible housings by chemical and/or mechanical means. Preferably, the ultrasonic wave generating means is chemically and mechanically mounted.
- 6 Chcmical means may comprise an epoxy resin, such as Hysol Epoxi-Patch ((RTM) available from Dexter Corporation, One Dexter Drive, Seabrook, NH 03874, USA).
The one or more submersible housings are preferably manufactured from steel, more preferably they are manufactured from stainless steel sheet less than 2 mm thick.
The washing of laundry by a washing machine typically comprises successive cycles comprising the steps of: i) mixing the water and detergent; ii) washing by agitation; and, iii) drying.
Typically, in conventional machines, dispersion and dissolution of the detergent and agitation of the laundry occurs as the wash basket rotates with periods of non-rotation during and between successive cycles. The dispersion and dissolution of the detergent and agitation by ultrasonic waves in the present invention takes place during steps i) and ii). However to prevent over-heating during use, the active face of the ultrasonic wave generating means is preferably below the water line of the wash liquid.
Preferably, the apparatus comprises means for biasing the wash basket into a predisposed orientation. The means for biasing may comprise a motor having an actuator. The motor may be a stepper motor, an idle motor or a geared secondary motor. Preferably, the motor is a stepper motor.
The means for biasing may further comprise a magnetic, infra-red and/or light
emitter and detector for accurate orientation of the ultrasonic wave generating means.
As a consequence, during phases of non-rotation, the wash basket may be aligned to ensure that the active face of the ultrasonic wave generating means is at or below the surface water line of the wash liquid. This may help prevent the ultrasonic wave generating means from over-heating when active i.e. when emitting ultrasonic waves.
The wash basket may be rotatably mounted about a substantially vertical or horizontal axis. Preferably, the wash basket is rotatably mounted about a substantially horizontal axis.
In a preferred embodiment, the wash basket is rotatably mounted about a substantially horizontal axis and the apparatus comprises means for biasing the orientation of the wash basket such that the active face of the ultrasonic wave generating means is at or below the surface water line of the wash liquid when active.
A specific embodiment of the present invention will now be described, by way of example only, with reference only to the accompanying figures: Fig. 1 is a front elevation of a horizontal axis washing machine in accordance with the present invention with a cross sectional view of the submersible housings; Figs. 2a and 2b are perspective views of a wash basket in accordance with the present invention viewed from the front and rear respectively; Fig. 3 is a perspective view of a submersible housing in accordance with the present invention; Fig. 4 is a rear elevation of the main pulley attached to the wash basket in accordance with the present invention; and
- 8 Figs. 5a, 5b and 5c illustrate a commutator lock nut in accordance with the present invention.
Fig. 6 is a rear elevation of the wash tub in accordance with the present invention Fig. 1 illustrates a horizontal axis washing machine 10 which has a front loading door 12 and a rotatably mounted wash basket 14 disposed within a cylindrical wash tub 15.
Figs. 2a and 2b illustrate a basket 14 having a cylindrical side wall 16, with apertures disposed therein, an end wall 18 and an open end 20. Open end 20 of wash basket 14 is closable by front loading door 12 which is hingedly mounted to machine 10 to provide selective access to basket]4 to permit loading and unloading of laundry. Disposed on the cylindrical side wall 16 of basket 14 are two submersible housings 30,32 each of which contains a respective bank of ultrasonic transducers 34,36 each bank consisting of three transducers in series having an active face 40, 42 from which ultrasonic waves are emitted. As shown in Fig. 3 (your Fig. 6), each submersible housing 30,32 comprises an elongate chamber defined by the side walls of an elongate member 44, which has a substantially rhomboidal cross-section, and end walls 46,48. Flanges 50,52 disposed at opposite edges of the rhomboidal housing abut side wall 16 of basket 14 and are fixed in place via rivets through apertures 54 to thereby secure the submersible housings 30,32 to basket 14. Alternatively, stainless steel counter sunk screws may be used which co-operate with threaded
- 9 - bores in the basket side wall 16. Ultrasonic generator 56, generates the waves emitted by transducers 34,36.
The angle subtended between the submersible housings 30,32 around side wall 16 is about 120 which ensures that, in the present embodiment, when aligned and during phases of non-rotation, the active faces 40, 42 of the transducers are both below the water line to prevent over-heating when the transducers are active i.e. emitting ultrasonic waves.
Fig. 4 illustrates the main pulley 60 shaped to receive a belt driven by a first motor (not illustrated) which rotates the wash basket, top dead centre pick up point (T.D.C.) 62 and commutator lock nut 64 which enables power to be delivered to the transducers 34,36 whilst allowing the basket 14 to rotate freely. Conduit 66 delivers power from the commutator 64 to the transducers 34,36.
Fig. 5a, Sb and 5c illustrate commutator lock nut 64 having a commutator head 80 comprising high and low contacts 82, 84 and an antistatic earth bond 86.
The contacts 82, 84 co-operate with carbon brushes to deliver power to the transducers 34, 36 via jack plug 88.
Fig. 6 illustrates Spider 70 having three legs 72,74,76 disposed radially and equidistantly from one another, which is mounted about hub 78. The first leg 72 is a balance anchor point which is necessary to ensure even weight distribution. The balance anchor point counterbalances the weight ofthe submersible housings 30, 32 to ensure correct and safe rotation ofthe wash basket 14.
Legs 74, 76 comprise arms 80, 82, which extend perpendicularly with respect
- 10 to the plane of the legs 74,76, co-operate with threaded bores 56, disposed in end walls 96 of submersible housings 30, 32 to mount the wash basket 14 on the spider 70. During periods of non-rotation in a wash cycle, a second, stepper motor (not illustrated) engages the washbasket 14 and rotates the basket 14 until TDC pick up point 62 is detected and aligned with a pick up point detector stopping the rotation of the basket 14 such that the active face of transducers is at or below the waterline.
I he stepper motor remains engaged to prevent further rotation of the basket 14 and the ultrasonic transducers are activated. Towards the end of the period of non-
rotation, the ultrasonic transducers are de-activated, ie. such that they do not emit ultrasonic waves, the stepper motor is disengaged and the basket 14 is free to rotate.
G:\CLIENT\405-409\MAG7\40791 I\GB\MASTER.WPD
Claims (28)
- - 11 CLAIMSI. An apparatus for washing laundry comprising a wash basket for receiving wash liquid, rotatably mounted about a central axis, and at least one ultrasonic wave generating means for generating ultrasonic waves in the wash liquid, rotatable with the wash basket.
- 2. An apparatus, as claimed in claim 1, wherein the wash basket is substantially conical in shape.
- 3. An apparatus, as claimed in claim 1, wherein the wash basket is substantially cylindrical in shape.
- 4. An apparatus, as claimed in any one of the preceding claims, wherein the ultrasonic wave generating means comprises at least one active face from which ultrasonic waves are emitted.
- 5. An apparatus, as claimed in any one of the preceding claims, wherein the apparatus comprises two ultrasonic wave generating means.
- 6. An apparatus, as claimed in any one of the preceding claims, wherein the ultrasonic wave generating means comprises at least one transducer.
- 7. An apparatus, as claimed in claim 6, wherein the transducer is a piezoelectric transducer.
- 8. An apparatus, as claimed in any one of the preceding claims, wherein power is delivered to the ultrasonic wave generating means by means of a commutator.
- 9. An apparatus, as claimed in claim 8, wherein the commutator enables- 12 power to be delivered to the ultrasonic wave generating means whilst permitting the wash basket to rotate freely.
- 10. An apparatus, as claimed in any one of the preceding claims, wherein the ultrasonic wave generating means is disposed within one or more submersible compartments capable of housing part of the ultrasonic generating means.
- 1 1. An apparatus, as claimed in claim 10, wherein at least a portion of the walls of the compartments act as water impermeable barriers between the ultrasonic wave generating means and the wash liquid.
- 12. An apparatus, as claimed in claim 10 or claim I 1, wherein the one or more submersible compartments are mounted to an inner wall of the wash basket.
- 13. An apparatus, as claimed in claim 10 or claim I 1, wherein the one or more submersible compartments are formed as an integral part of the inner wall.
- 14. An apparatus, as claimed in claim 10 or claim I 1, wherein the one or more submersible compartments are releasably mounted to the inner wall.
- 15. An apparatus, as claimed in any one of claims 10 to 14, wherein the apparatus comprises two submersible compartments.
- 16. An apparatus, as claimed in any one of claims 10 to 15, wherein the submersible compartments are disposed uniformly around the periphery of the wash basket.
- 17. An apparatus, as claimed in any one of the preceding claims, further comprising an agitator.
- 18. An apparatus, as claimed in any one of the preceding claims, wherein the ultrasonic wave generating means is mounted in the one or more submersible- 13 compartments by chemical means.
- 19. An apparatus, as claimed in any one of claims 1 to 17, wherein the ultrasonic wave generating means is mounted in the one or more submersible compartments by mechanical means.
- 20. An apparatus, as claimed in claim 18, wherein the chemical means of mounting the ultrasonic wave generating means comprises an epoxy resin.
- 21. An apparatus as claimed in any of claims 10 to 20, wherein the one or more submersible compartments are manufactured from steel.
- 22. An apparatus as claimed in any of claims 4 to 21, wherein the active face of the ultrasonic wave generating means is below the water line of the wash liquid when active.
- 23. An apparatus as claimed in any of claims 10 to 22, further comprising means for biasing the wash basket in a predisposed orientation.
- 24. An apparatus, as claimed in claim 23, wherein the means for biasing the wash basket comprises a motor having an actuator.
- 25. An apparatus, as claimed in claim 24, wherein the means for biasing the wash basket further comprises a magnetic, infra-red and/or light emitter and detector.
- 26. An apparatus, as claimed in any one of the preceding claims, wherein the wash basket is rotatably mounted about a substantially vertical axis.
- 27. An apparatus, as claimed in any one of claims 1 to 26, wherein the wash basket is rotatably mounted about a substantially horizontal axis.
- 28. An apparatus substantially as described herein with reference to and as illustrated by the accompanying drawings.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0220539A GB2392923B (en) | 2002-09-04 | 2002-09-04 | Washing machine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0220539A GB2392923B (en) | 2002-09-04 | 2002-09-04 | Washing machine |
Publications (3)
Publication Number | Publication Date |
---|---|
GB0220539D0 GB0220539D0 (en) | 2002-10-09 |
GB2392923A true GB2392923A (en) | 2004-03-17 |
GB2392923B GB2392923B (en) | 2006-05-03 |
Family
ID=9943481
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB0220539A Expired - Fee Related GB2392923B (en) | 2002-09-04 | 2002-09-04 | Washing machine |
Country Status (1)
Country | Link |
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GB (1) | GB2392923B (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1598469A1 (en) * | 2004-05-17 | 2005-11-23 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
EP1598468A1 (en) * | 2004-05-17 | 2005-11-23 | The Procter & Gamble Company | Method and system for washing with wash liqour cleanup and recycle |
WO2005116320A1 (en) * | 2004-05-17 | 2005-12-08 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
EP1605089A1 (en) * | 2004-05-17 | 2005-12-14 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
WO2008084925A2 (en) * | 2007-01-10 | 2008-07-17 | Lg Electronics Inc. | Multiple laundry treating machine |
ES2538901A1 (en) * | 2013-12-24 | 2015-06-24 | Bsh Electrodomésticos España, S.A. | Washing machine and procedure for using said washing machine (Machine-translation by Google Translate, not legally binding) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
RU205742U1 (en) * | 2021-04-16 | 2021-08-06 | Игорь Анатольевич Страбыкин | ULTRASONIC WASHING MACHINE |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468550A (en) * | 1944-10-27 | 1949-04-26 | Motorola Inc | Method of and apparatus for cleaning by ultrasonic waves |
GB2181164A (en) * | 1984-05-17 | 1987-04-15 | Masao Kanazawa | An ultrasonic washing machine |
EP0261363A1 (en) * | 1986-08-28 | 1988-03-30 | INDUSTRIE ZANUSSI S.p.A. | Ultrasonic laundry washing machine |
EP0288378A1 (en) * | 1987-04-21 | 1988-10-26 | Jean Blasutti | Ultrasonic waves washing machine |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS61131798A (en) * | 1984-12-01 | 1986-06-19 | 谷垣 鈴代 | Washing machine |
JPH01317480A (en) * | 1988-06-20 | 1989-12-22 | Fujitsu General Ltd | Washing machine |
US4883500A (en) * | 1988-10-25 | 1989-11-28 | General Electric Company | Sawblade segments utilizing polycrystalline diamond grit |
JP2000334199A (en) * | 1999-05-27 | 2000-12-05 | Teruko Kato | Drying machine utilizing ultrasonic wave |
-
2002
- 2002-09-04 GB GB0220539A patent/GB2392923B/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2468550A (en) * | 1944-10-27 | 1949-04-26 | Motorola Inc | Method of and apparatus for cleaning by ultrasonic waves |
GB2181164A (en) * | 1984-05-17 | 1987-04-15 | Masao Kanazawa | An ultrasonic washing machine |
EP0261363A1 (en) * | 1986-08-28 | 1988-03-30 | INDUSTRIE ZANUSSI S.p.A. | Ultrasonic laundry washing machine |
EP0288378A1 (en) * | 1987-04-21 | 1988-10-26 | Jean Blasutti | Ultrasonic waves washing machine |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1598469A1 (en) * | 2004-05-17 | 2005-11-23 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
EP1598468A1 (en) * | 2004-05-17 | 2005-11-23 | The Procter & Gamble Company | Method and system for washing with wash liqour cleanup and recycle |
WO2005116320A1 (en) * | 2004-05-17 | 2005-12-08 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
EP1605089A1 (en) * | 2004-05-17 | 2005-12-14 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
AU2005248346B2 (en) * | 2004-05-17 | 2009-12-10 | The Procter & Gamble Company | Method and system for washing with wash liquor cleanup and recycle |
US7950254B2 (en) | 2004-05-17 | 2011-05-31 | The Procter & Gamble Company | Method and system for washing |
WO2008084925A2 (en) * | 2007-01-10 | 2008-07-17 | Lg Electronics Inc. | Multiple laundry treating machine |
WO2008084925A3 (en) * | 2007-01-10 | 2008-10-30 | Lg Electronics Inc | Multiple laundry treating machine |
ES2538901A1 (en) * | 2013-12-24 | 2015-06-24 | Bsh Electrodomésticos España, S.A. | Washing machine and procedure for using said washing machine (Machine-translation by Google Translate, not legally binding) |
Also Published As
Publication number | Publication date |
---|---|
GB0220539D0 (en) | 2002-10-09 |
GB2392923B (en) | 2006-05-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20180904 |