EP2060667A1 - Household appliance - Google Patents
Household appliance Download PDFInfo
- Publication number
- EP2060667A1 EP2060667A1 EP07121046A EP07121046A EP2060667A1 EP 2060667 A1 EP2060667 A1 EP 2060667A1 EP 07121046 A EP07121046 A EP 07121046A EP 07121046 A EP07121046 A EP 07121046A EP 2060667 A1 EP2060667 A1 EP 2060667A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- magnet
- casing
- electromagnet
- vibration damper
- household appliance
- 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
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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
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/48—Preventing or reducing imbalance or noise
-
- 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
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/26—Unbalance; Noise level
Definitions
- each of them consists of a preferably, though not necessarily, ferromagnetic C-shaped metallic body 19 having each of its two end-portions 19a fitted in sliding manner to a respective supporting bar 10, 10', so as to be directly faced to a corresponding permanent-, or electro- magnet 11 or 11'; and of an induction coil 20 of electrically conducting material, which is rigidly fitted to the central portion 19b of metallic body 16 so as to generate, when supplied with electric current, a magnetic field which creates on metallic body 16 a magnetic north pole and a magnetic south pole.
Abstract
Description
- The present invention relates to a household appliance.
- More specifically, the present invention relates to a laundry washing machine to which the following description refers purely by way of example.
- As is known, high-speed rotation of the revolving drum of the washing machine produces severe machine vibrations which are transferred to the casing of the washing machine, and which normally become much more problematic as the speed of the revolving drums increases.
- To reduce machine vibrations, in today's laundry washing machines the entire washing assembly (i.e. the washing tub and the revolving drum mounted in axially rotating manner inside the washing tub) is normally suspended in floating manner into the machine casing via a system of springs and dampers designed to absorb the vibrations before they reach the casing.
- In particular installation conditions, however, the floating suspension system fails to sufficiently reduce machine vibrations reaching the casing, so that the washing machine becomes noisy. For example, when a washing machine rests on a flexible floor, such as a wooden floor, a soft floor, or a floor resting on a thin slab, the vibrations generated by the revolving drum during the spin cycle may be resonance-amplified to an unacceptable noise level, and may damage not only the washing machine but also the floor.
- To overcame this drawback today's high-end washing machines are also provided with a vibration damper fixed to the casing to reduce vibrations of the washing machine at resonance speeds, and which comprises an oscillating mass and a number of coil springs connecting the oscillating mass to the washing machine casing. The oscillating mass and the coil spring system are properly dimensioned to vibrate, during rotation of the drum, in phase-opposition with respect to vibrations transmitted to the casing by the floating suspension system, thus reducing the amplitude of the casing vibrations.
- Unfortunately the above cited vibration dampers - traditionally known as "Frahm dampers" - only provide for optimum dumping performance over a limited range of the possible drum rotation speeds, i.e. over a limited range of the possible vibration frequencies.
- Moreover, the drum rotation speeds at which resonance phenomena take place also depend on the unevenly distribution of the laundry on the lateral wall of the revolving drum, and on the installation conditions (for example on the type of floor upon which the washing machine rests). Thus resonance phenomena vary from one washing machine to another and from one installation place to another, and it is therefore practically impossible to precisely determine, at manufacturing stage, the frequencies at which to tune up the "Frahm damper".
- Accordingly, in known washing machines with tuned vibration dampers, performance of the dampers is not always entirely satisfactory and is invariably below expectations.
- It is an object of the present invention to provide a vibration damper offering optimum performance over the full range of the possible drum rotation speeds, regardless of laundry distribution into the drum and of the installation place.
- According to the present invention, there is provided a household appliance as claimed in the accompanying Claims.
- A non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
-
Figure 1 shows a perspective view, with parts in section and parts removed for clarity, of a laundry washing machine with a vibration damper in accordance with the teachings of the present invention; -
Figure 2 shows a schematic front view of a second embodiment of the vibration damper ofFigure 1 washing machine; and -
Figure 3 shows a schematic front view of a third embodiment of the vibration damper ofFigure 1 washing machine. - With reference to
Figure 1 ,Number 1 indicates as a whole a household appliance comprising acasing 2 which is liable to severe machine vibrations during functioning. - In particular, in the example shown
household appliance 1 is alaundry washing machine 1 comprising a parallelepiped-shapedouter box casing 2 resting on the floor; acylindrical washing tub 3 which is connected in floating manner tocasing 2 by asuspension system 4; and a revolvingdrum 5 for housing the laundry to be washed, and which is fitted in rotary manner insidewashing tub 3. - More specifically, in the example shown
washing tub 3 is provided with afront opening 3a faced to a corresponding laundry loading and unloading opening (not shown) which is formed in the front face ofcasing 2 and is selectively closable by a door (not shown) hinged tocasing 2; whereas revolvingdrum 5 is mounted in axially rotating manner inside washingtub 3 about a horizontal rotation axis A. - As regards
suspension system 4, in the example shown it consists of a number of coil springs 6 (only one shown inFigure 1 ) connecting thewashing tub 3 to the upper portion ofcasing 2, combined with one ormore dampers 7. - With reference to
Figure 1 ,washing machine 1 also comprises anelectric motor 8 which is mechanically connected todrum 5 so as to rotate, on command,drum 5 about its longitudinal rotation axis Ainside washing tub 3. - Washing
tub 3, revolvingdrum 5, and the other washing machine component parts suspended fromcasing 2 viasuspension system 4 form the washing assembly of the washing machine. - With reference to
Figure 1 ,household appliance 1,i.e. washing machine 1 also comprises avibration damper 9 which is fixed tocasing 2 to reduce vibrations transmitted tocasing 2 bysuspension system 4 as revolvingdrum 5 rotates. - More specifically,
vibration damper 9 is fixed insidecasing 2 and comprises a supportingbar 10 rigidly fixed tocasing 2 and extending parallel to a horizontal reference axis B which is preferably, though not necessarily, perpendicular to rotation axis A ofdrum 5; a first permanent-, or electro-magnet 11 which generates a constant magnetic field and is rigidly fitted to supportingbar 10 with its magnetic poles aligned with reference axis B; and asecond electromagnet 12 fitted in sliding manner to supportingbar 10 so as that one of its two magnetic poles is directly faced to one of the magnetic poles ofmagnet 11, thus allowing the magnetic field ofelectromagnet 12 to interact with the magnetic field ofmagnet 11. - With reference to
figure 1 ,vibration damper 9 also comprises anelectric power unit 13 which is capable to power the induction coil ofelectromagnet 12 with a variable-frequency alternate current, so thatelectromagnet 12 generates a variable magnetic field which, interacting with the magnetic field generated bymagnet 11, causes a reciprocating movement ofelectromagnet 12 along supportingbar 10. Magnetic poles having the same magnetic polarity, in fact, tend to push away one from the other, whereas magnetic poles having opposite magnetic polarity tend to attract one to the other. - Obviously the reciprocating movement of
electromagnet 12 along supportingbar 10 causes mechanical vibration which are transmitted tocasing 2. The frequency of said mechanical vibrations depends on the frequency of the alternate current supplied to the induction coil ofelectromagnet 12. - With reference to
figure 1 ,vibration damper 9 finally comprises anaccelerometer 14 or similar sensor capable of determine, instant by instant, the amplitude and frequency spectrum ofcasing 2 vibrations; and an electroniccentral control unit 15 which receives the signals fromsensor 14 and is capable to determine, instant by instant, the appropriate frequency of the alternate current to be supplied toelectromagnet 12 for producing mechanical vibrations in phase-opposition with respect to the mechanical vibrations transmitted tocasing 2 viasuspension system 4, so as to reducecasing 2 vibrations amplitude in the whole range of the possible rotation speeds of revolvingdrum 5. - More specifically, electronic
central control unit 15 ofvibration damper 9 controlselectric power unit 13 for tuning up, instant by instant, the maximum value and frequency of the alternate current supplied toelectromagnet 12 according to the actual amplitude and frequency spectrum ofcasing 2 vibration, for performing a selective damping ofcasing 2 vibrations while revolvingdrum 5 is rotating at any speed causing dangerous resonance phenomena and/or causing excessive noise. - With reference to
Figure 1 , in the example shownmagnet 11 consists of cylindrical-shaped permanent magnet extending coaxial to reference axis B of supportingbar 10, and having its magnetic north pole directly faced toelectromagnet 12, whereaselectromagnet 12 consists of an upside down L-shapedmetallic body 16 having preferably, though not necessarily, ferromagnetic characteristics, and which has its horizontalupper portion 16a fitted in sliding manner to supportingbar 10; and of aninduction coil 17 of electrically conducting material, which is rigidly fitted to the verticallower portion 16b ofmetallic body 16 so as to generate, when supplied with electric current, a magnetic field which creates onmetallic body 16 a magnetic north pole and a magnetic south poles. -
Electric power unit 13 ofvibration damper 9powers induction coil 17 ofelectromagnet 12 with a variable-frequency alternate current, so that the magnetic north and south poles onmetallic body 16 shift their position in synchrony with the alternate current. - Operation of
laundry washing machine 1 andvibration damper 9 can be deduced from the foregoing description with no further explanation required, except to state thatvibration damper 9 is able to reduce vibrations amplitude over the whole range of the possible rotation speeds of revolvingdrum 5. Moreover, being able to tune up the mechanical vibrations ofelectromagnet 12 with respect to any possible resonant frequency of the washing machine structure,vibration damper 9 eliminates all resonance phenomena. - The use of
vibration damper 9, as described above, has therefore numerous advantages: stability and silenceness of thelandry washing machine 1 is strongly increased at any possible rotation speed of revolvingdrum 5. In fact, contrary to conventional currently used Frahm dampers (i.e. comprising a small oscillating mass and a number of coil springs) which work fine in a limited frequency range ofcasing 2 vibrations, operativeness ofvibration damper 9 extends to all possible frequencies ofcasing 2 vibrations. - Clearly, changes may be made to
vibration damper 9 as described herein without, however, departing from the scope of the present invention. - For example, with reference to
Figure 2 , according to an alternativeembodiment vibration damper 9 may comprise afurther electromagnet 18 which is fitted in sliding manner to supportingbar 10, on the opposite side ofelectromagnet 12 with respect tomagnet 11, so as to be faced to the second magnetic pole ofmagnet 11. In other words,electromagnets magnet 11. - Likewise
electromagnet 12,electromagnet 18 has one of its two magnetic poles directly faced to one of the magnetic poles ofmagnet 11 for allowing its magnetic field to interact with the magnetic field ofmagnet 11; andelectric power unit 13 powers the induction coil ofelectromagnet 18 with a variable-frequency alternate current so that alsoelectromagnet 18 generates a variable magnetic field which, interacting with the magnetic field generated bymagnet 11, causes a reciprocating movement ofelectromagnet 18 along supportingbar 10. - In which embodiment, electronic
central control unit 15 ofvibration damper 9 may controlelectric power unit 13 for tuning up, instant by instant, the alternate current supplied toelectromagnet 12 and the alternate current supplied toelectromagnet 18 independently one from the other. - If the alternate current supplied to
electromagnet 12 is equal to the alternate current supplied toelectromagnet 18,electromagnet 18 moves in synchrony withelectromagnet 12 thus the seismic mass is doubled and the amplitude of the mechanical vibrations generated byvibration damper 9 is doubled. - If the alternate current supplied to
electromagnet 12 differs from the alternate current supplied toelectromagnet 18,vibration damper 9 generates two mechanical vibrations having two different frequencies, thus allowing a much more accurate dumping of the vibrations transmitted tocasing 2 viasuspension system 4. - With reference to
Figure 3 , in a still furtherembodiment vibration damper 9 may comprise two supportingbars 10 and 10' which are rigidly fixed tocasing 2 one parallel to the other, and each of which extends parallel to a respective horizontal reference axis B, B' which is preferably, though not necessarily, perpendicular to rotation axis A ofdrum 5; two permanent-, or electro-magnets 11 and 11', each of which generates a constant magnetic field and is rigidly fitted to a respective supportingbar 10 or 10' with its two magnetic poles aligned with reference axis B, B' of the bar; and twoelectromagnets 12 and 12' fitted in sliding manner to supportingbars 10 and 10' on opposite sides of bothmagnets 11 and 11', so as that eachelectromagnet 12, 12' has its two magnetic poles directly faced each to a respective magnetic pole of adifferent magnet 11, 11', thus allowing the magnetic field of bothelectromagnets 12 and 12' to interact with the magnetic field of bothmagnets 11 and 11'. - More specifically, in the example shown supporting
bars 10 and 10' lie, one above the other, on a common vertical plane which is perpendicular to rotation axis A ofdrum 5, whereas the two permanent-, orelectromagnets 11 and 11' are rigidly fixed to supportingbars 10 and 10' vertically aligned one above the other with a specular orientation of the magnetic poles. - As regards the two
electromagnets 12 and 12', each of them consists of a preferably, though not necessarily, ferromagnetic C-shapedmetallic body 19 having each of its two end-portions 19a fitted in sliding manner to a respective supportingbar 10, 10', so as to be directly faced to a corresponding permanent-, or electro-magnet 11 or 11'; and of aninduction coil 20 of electrically conducting material, which is rigidly fitted to thecentral portion 19b ofmetallic body 16 so as to generate, when supplied with electric current, a magnetic field which creates onmetallic body 16 a magnetic north pole and a magnetic south pole. - Also in this embodiment,
electric power unit 13 powers theinduction coil 20 of eachelectromagnet 12, 12' with a specific variable-frequency alternate current, so that eachelectromagnet 12, 12' generates a corresponding variable magnetic field which, interacting with the magnetic fields generated by bothmagnets 11 and 11', causes a reciprocating movement of theelectromagnet 12, 12' along both supportingbars 10 and 10'; whereas electroniccentral control unit 15 controlselectric power unit 13 for tuning up, instant by instant, the alternate current supplied to each of the twoelectromagnets 12 and 12'. - If powered with the same alternate current, the two
electromagnets 12 and 12' move in synchrony along supportingbars 10 and 10', doubling the seismic mass and, thus, the amplitude of the mechanical vibrations generated by vibration damper. - If powered with different alternate currents, the two
electromagnets 12 and 12' reciprocate along supportingbars 10 and 10' at different frequencies, thus allowingvibration damper 9 to generate two different mechanical vibrations. - Finally, according to an alternative structure of
vibration damper 9, electromagnet/s s 10, 10', while permanent-, or electro- magnet/s 11 and 11' may be fitted in sliding manner to supporting bar/s 10 and 10'.
Claims (10)
- Household appliance (1) comprising a casing (2) subjected to vibrations, and a vibration damper (9) fixed to said casing (2) to reduce casing vibrations; the household appliance(1) being characterized in that said vibration damper (9) comprises:- a supporting frame (10) rigidly fixed to the appliance casing (2);- at least a first magnet (11, 11'; 12, 18, 12') rigidly fitted to the supporting frame (10), and- at least a second magnet (12, 18, 12'; 11, 11') fitted in sliding manner to said supporting frame (10) so as to have one of its magnetic poles faced to one of the magnetic poles of the first magnet (11) for allowing the magnetic field of said second magnet (12, 18, 12'; 11, 11') to interact with the magnetic field of said first magnet (11, 11'; 12, 18, 12'); the first magnet (11, 11'; 12, 18, 12') or the second magnet (12, 18, 12'; 11, 11') being an electromagnet (12, 12', 18), and the vibration damper (9) also comprising:- electric power means (13) capable to power the induction coil (17, 20) of said electromagnet (12, 12', 18) with an alternate current so as to cause reciprocating movement of the second magnet (12, 18, 12'; 11, 11') along said supporting frame (10), and- a central control unit (15) which controls the electric power means (13) and is capable to determine, instant by instant, the frequency of the alternate current to be supplied to the induction coil (17, 20) of said electromagnet (12, 12', 18) for producing mechanical vibrations almost in phase-opposition with respect to the mechanical vibrations of the appliance casing (2).
- Household appliance as claimed in Claim 1, characterized by also comprising detecting means (14) capable to determine, instant by instant, the amplitude and frequency spectrum of the mechanical vibrations of the appliance casing (2); the central control unit (15) being connected to said detecting means (14), and being able to determine the frequency of the alternate current to be supplied to the induction coil (17, 20) of said electromagnet (12, 12', 18) on the basis of the amplitude and frequency spectrum of said mechanical vibrations.
- Household appliance as claimed in any of the foregoing Claims, characterized in that the first magnet (11, 11'; 12, 18, 12') or the second magnet (12, 18, 12'; 11, 11') not being an electromagnet (12, 12', 18) is a permanent-magnet (11, 11').
- Household appliance as claimed in any one of the foregoing Claims, characterized in that said second magnet (12, 18, 12'; 11, 11') is able to reciprocate on said supporting frame (10) along an substantially horizontal reference axis (B).
- Household appliance as claimed in any one of the foregoing Claims, characterized in that said vibration damper (9) comprises a couple of second magnets (12, 18, 12'; 11, 11') fitted in sliding manner to said supporting frame (10) on opposite sides of said first magnet (11, 11'; 12, 18, 12').
- Household appliance as claimed in Claim 5, characterized in that said vibration damper (9) comprises a couple of first magnets (11, 11'; 12, 18, 12') located between said second magnets (12, 18, 12'; 11, 11'); each of said first magnets (11, 11'; 12, 18, 12') being faced to one of the two magnetic poles of each second magnet (12, 18, 12'; 11, 11').
- Household appliance as claimed in any one of Claims 1 to 4, characterized in that said vibration damper (9) comprises a couple of first magnets (11, 11'; 12, 18, 12') fixed to said supporting frame (10) on opposite sides of said second magnet (12, 18, 12'; 11, 11').
- Household appliance as claimed in any one of the foregoing Claims, characterized in that said vibration damper (9) is fixed inside of said casing (2).
- Household applianceas claimed in any one of the foregoing Claims, characterized in that it is a laundry washing machine (1).
- Household appliance as claimed in Claims 9 and 4, characterized in that said washing machine (1) comprises a revolving drum (5) for housing the laundry to be washed, and which is fitted in rotary manner inside the casing (2) about a given rotation axis (A); the reference axis (B) along which the second magnet (12, 18, 12'; 11, 11') reciprocates, being substantially perpendicular to said rotation axis (A).
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ES07121046T ES2349442T3 (en) | 2007-11-19 | 2007-11-19 | APPLIANCES. |
PL07121046T PL2060667T3 (en) | 2007-11-19 | 2007-11-19 | Household appliance |
EP07121046A EP2060667B1 (en) | 2007-11-19 | 2007-11-19 | Household appliance |
AT07121046T ATE474953T1 (en) | 2007-11-19 | 2007-11-19 | HOUSEHOLD APPLIANCE |
DE602007007963T DE602007007963D1 (en) | 2007-11-19 | 2007-11-19 | household appliance |
RU2008145562/12A RU2467106C2 (en) | 2007-11-19 | 2008-11-18 | Household appliance |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP07121046A EP2060667B1 (en) | 2007-11-19 | 2007-11-19 | Household appliance |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2060667A1 true EP2060667A1 (en) | 2009-05-20 |
EP2060667B1 EP2060667B1 (en) | 2010-07-21 |
Family
ID=39262590
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07121046A Not-in-force EP2060667B1 (en) | 2007-11-19 | 2007-11-19 | Household appliance |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP2060667B1 (en) |
AT (1) | ATE474953T1 (en) |
DE (1) | DE602007007963D1 (en) |
ES (1) | ES2349442T3 (en) |
PL (1) | PL2060667T3 (en) |
RU (1) | RU2467106C2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107131241A (en) * | 2017-06-29 | 2017-09-05 | 上海洁神洗涤机械制造有限公司 | A kind of suspension shock mitigation system of washing and dehydrating integrated machine |
WO2019129671A1 (en) * | 2017-12-26 | 2019-07-04 | Arcelik Anonim Sirketi | Power source for a rotatable drum |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6087951A (en) * | 1999-04-05 | 2000-07-11 | The Cherry Corporation | Magnetic accelerometer |
US20020050671A1 (en) * | 2000-10-30 | 2002-05-02 | Delta Tooling Co., Ltd. | Magnet unit and method of production thereof |
US20050188472A1 (en) | 2004-02-23 | 2005-09-01 | Lg Electronics Inc. | Washer damper thereof, and control method thereof |
US20080188472A1 (en) | 2004-03-08 | 2008-08-07 | Prosidion Limited | Indole-2-Carboxylic Acid Hydrazides |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4412723B2 (en) * | 2004-09-13 | 2010-02-10 | パナソニック株式会社 | Drum washing machine |
-
2007
- 2007-11-19 EP EP07121046A patent/EP2060667B1/en not_active Not-in-force
- 2007-11-19 ES ES07121046T patent/ES2349442T3/en active Active
- 2007-11-19 AT AT07121046T patent/ATE474953T1/en not_active IP Right Cessation
- 2007-11-19 DE DE602007007963T patent/DE602007007963D1/en active Active
- 2007-11-19 PL PL07121046T patent/PL2060667T3/en unknown
-
2008
- 2008-11-18 RU RU2008145562/12A patent/RU2467106C2/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6087951A (en) * | 1999-04-05 | 2000-07-11 | The Cherry Corporation | Magnetic accelerometer |
US20020050671A1 (en) * | 2000-10-30 | 2002-05-02 | Delta Tooling Co., Ltd. | Magnet unit and method of production thereof |
US20050188472A1 (en) | 2004-02-23 | 2005-09-01 | Lg Electronics Inc. | Washer damper thereof, and control method thereof |
US20080188472A1 (en) | 2004-03-08 | 2008-08-07 | Prosidion Limited | Indole-2-Carboxylic Acid Hydrazides |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107131241A (en) * | 2017-06-29 | 2017-09-05 | 上海洁神洗涤机械制造有限公司 | A kind of suspension shock mitigation system of washing and dehydrating integrated machine |
WO2019129671A1 (en) * | 2017-12-26 | 2019-07-04 | Arcelik Anonim Sirketi | Power source for a rotatable drum |
Also Published As
Publication number | Publication date |
---|---|
EP2060667B1 (en) | 2010-07-21 |
RU2467106C2 (en) | 2012-11-20 |
RU2008145562A (en) | 2010-05-27 |
DE602007007963D1 (en) | 2010-09-02 |
PL2060667T3 (en) | 2011-01-31 |
ES2349442T3 (en) | 2011-01-03 |
ATE474953T1 (en) | 2010-08-15 |
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