Drum type washing machine and its control method

a washing machine and drum technology, applied in the direction of washing machines with receptacles, other washing machines, textiles and paper, etc., can solve the problems of insufficient suppression of vibrations occurring during dehydration and noise generation

Inactive Publication Date: 2003-07-31
SANYO ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such a conventional drum-type washing machine, an eccentric load is liable to occur due to uneven distribution of the laundry retained in the drum during dehydration thereby to cause vibrations and produce noises due to the vibrations.
With these conventional ...

Method used

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  • Drum type washing machine and its control method
  • Drum type washing machine and its control method
  • Drum type washing machine and its control method

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0043] [First Embodiment]

[0044] A drum-type washing machine according to a first embodiment of the present invention will hereinafter be described with reference to FIGS. 1 to 9.

[0045] FIG. 1 is a vertical sectional view illustrating the overall construction of the drum-type washing machine. A cylindrical outer tub 2 is provided in a housing 1, and a cylindrical drum 3 for retaining laundry is supported by a rotation shaft 7 within the outer tub 2. A door 6 through which laundry is loaded in the drum is openably provided on a front opening of the drum 3. Baffles 5 for stirring up the laundry are provided at proper positions on an inner circumferential surface of the drum 3. A multiplicity of water communication perforations 4 are formed in a circumferential wall of the drum 3. In a washing process and a rinsing process, water supplied into the outer tub 2 flows into the drum 3 through the water communication perforations 4. In a centrifugal dehydration process, water extracted from ...

second embodiment

[0080] [Second Embodiment]

[0081] A drum-type washing machine according to a second embodiment of the present invention will next be described with reference to FIGS. 10 to 12.

[0082] FIG. 10 is a vertical sectional view illustrating the overall construction of the drum-type washing machine according to the second embodiment. Components having the same construction as those of the washing machine of the first embodiment are denoted by the same reference numerals, and no explanation will be given thereto. In the washing machine, a balancer 23 which is a hollow annular component containing a predetermined amount of water (or any other liquid, such as a saline solution or a potassium chloride solution, preferably having a higher density) is provided on the back side of the drum 3. FIG. 11 is a sectional view taken along a line B-B' in FIG. 10. In the balancer 23, L-shaped partition walls 24 are provided at predetermined angular intervals as radially projecting from the circumference of t...

third embodiment

[0092] [Third Embodiment]

[0093] A drum-type washing machine according to a third embodiment of the present invention will be described with reference to FIGS. 13 to 18.

[0094] FIG. 13 is a vertical sectional view illustrating the overall construction of the drum-type washing machine according to the third embodiment. Components having the same construction as those of the washing machines of the first and second embodiments are denoted by the same reference characters, and no explanation will be given thereto.

[0095] This washing machine obviates the rotation sensor 18 provided in the washing machines of the first and second embodiments. Instead, an acceleration sensor 29 is provided on a front upper portion of the outer tub 2. The acceleration sensor 29 mainly serves to detect a vertical acceleration of the outer tub 2. The magnitude and position of an eccentric load exerted on the drum 3 are determined on the basis of the result of the detection by the acceleration sensor 29.

[0096] ...

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PUM

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Abstract

The present invention provides a drum-type washing machine which features suppression of vibrations and noises during dehydration. To this end, an unbalanced load occurring around a rotation axis of the drum due to uneven distribution of laundry is canceled. More specifically, a plurality of water tanks (20) each having an opening on the inner periphery thereof are provided around the rotation axis on the back side of the drum (3). Where an eccentric load occurring due to the uneven distribution of the laundry is greater than an allowable level, a water supply valve (14) is opened to introduce water into the respective water tanks (20) with the drum 3 kept rotated, and the water is kept retained in the water tanks by a centrifugal force. Thereafter, the rotation speed of the drum (3) is temporarily reduced at a time point according to the position of the eccentric load to cause the water to fall only from water tanks (20) located at the same position as the position of the eccentric load or adjacent the position of the eccentric load for reduction of the weight of the water retained therein. The eccentric load occurring due to the uneven distribution of the laundry is canceled by an eccentric load generated by the water tanks not fully filled with the water and the other water tanks fully filled with the water, whereby the unbalanced load exerted on the entire drum (3) can be eliminated.

Description

[0001] The present invention relates to a drum-type washing machine having a drum which is rotated for washing and dehydration.PRIOR ART[0002] Conventional drum-type washing machines have a drum rotatable about a generally horizontal rotation axis within an outer tub, and laundry is retained in the drum.[0003] In such a conventional drum-type washing machine, an eccentric load is liable to occur due to uneven distribution of the laundry retained in the drum during dehydration thereby to cause vibrations and produce noises due to the vibrations. Particularly, greater vibrations occur at the start of the dehydration.[0004] Conventional measures for suppression of the vibrations occurring due to the uneven distribution of the laundry are to perform a disentangling process for disentangling the laundry in water retained in the drum before the dehydration and to support the outer tub by a damper which is capable of accommodating the eccentric load caused by the unevenly distributed laund...

Claims

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Application Information

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IPC IPC(8): D06F35/00D06F37/22
CPCD06F35/007D06F37/225D06F2216/00D06F2204/065D06F2202/065D06F2105/58D06F2103/24D06F33/48D06F2105/48D06F2103/46D06F23/02D06F34/16D06F39/125D06F2103/26Y02B40/00
Inventor YAMAMOTO, HIROSHIKINOUCHI, TAKAOYOKOI, YASUHIKONOGUCHI, YOSHIAKI
Owner SANYO ELECTRIC CO LTD
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