JP2863043B2 - Electric washing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric washing machine for home use, and more particularly to an electric washing machine for reducing vibrations generated when an inner tub rotates at a high speed for dehydration.

[0002]

2. Description of the Related Art FIG. 12 shows a standard structure of a home electric washing machine according to the present invention. This electric washing machine is a fully automatic type, and has an inner tub 1 that performs both washing and dehydration. The inner tank 1 is covered by a water receiving outer tank 4 elastically supported by a suspension rod 3 suspended from an upper portion of an outer frame 2 covering the whole. Driving means 6 is fixed to a bottom outer surface of the outer tub 4 via a base 5.

The driving means 6 comprises a motor 6m and a transmission 6g, and the output shaft of the transmission 6g is connected to the inner tank 1 and the stirring blade 7 in the inner tank. That is, the output shaft has a biaxial structure including a central shaft and an outer peripheral shaft, and the central shaft is connected to the stirring blade 7 and the outer peripheral shaft is connected to the inner tank 1.

The operation of such a fully automatic electric washing machine is as follows. Inner tub with clothes and detergent you want to wash
When a certain amount of water is supplied, the stirring blade 7 automatically starts rotating when the water supply is completed, and the clothes are washed while stirring. When the washing is completed, drainage and rinsing are performed, and after the drainage is completed, the inner tub 1 rotates and the clothes are centrifugally dehydrated. During the dehydration process, imbalance occurs due to the bias of the clothes, and the outer tub 4 vibrates violently through the inner tub 1 and the center shaft, generating noise. In addition, vibration from a driving mechanism such as a motor is transmitted to each part of the structure, and becomes noise. In particular, the acoustic radiation from the outer tank 4 having a large radiation area is large.

[0005] Fig. 13 shows a standard electric washing machine of a two-tub type. This electric washing machine has a single washing tub 1
0 and a dehydration tub comprising an inner tub 11 and an outer tub 12, and the laundry that has been washed in the washing tub 10 is transferred to the inner tub 11 of the dehydration tub to perform dehydration. .

[0006] For this purpose, the stirring blade 13 is provided in the washing tub 10, and its driving means 14 is attached to the lower bottom surface of the washing tub 10 via the base 15. On the other hand, the inner tub 11 of the dewatering tub is adapted to perform high-speed rotation for dehydration, its driving means 16 is fixed to the bottom lower surface of the outer tub 12 via the base 17, and the outer tub 12 is elastic. It is supported on the bottom of the outer frame 19 via the support member 18.

[0007] Even in the two-tub type electric washing machine, severe vibrations occur in the inner tub 11 and the outer tub 12 during the spin-drying operation as in the case of the fully automatic type.

[0008] A wide variety of structures are already known for reducing the vibration generated during such dehydration. For example, Japanese Unexamined Patent Application Publication Nos. Hei 2-168041, Hei 3-50875, and Japanese Unexamined Patent Publication No. Sho 58-97399 show such examples.

[0009]

These prior arts exhibit the effect of reducing vibration and noise to some extent, but none of them are satisfactory, and there is a demand for a structure that can achieve a further reduction effect.

[0010]

According to the present invention, there is provided an inner tank for high-speed rotation for dehydration, an outer tank for receiving water covering the inner tank, a driving means for rotating the inner tank, and an outer frame for covering the whole. In the electric washing machine described above, the vibration absorber generated in at least one of the vibrating parts is provided with a vibration absorbing body which is sealed in the sealing chamber with the granular vibration absorbing medium in a state capable of appropriate movement. Thus, an efficient vibration reduction structure is realized by providing the vibration absorbing medium in a state capable of transmitting the vibration to the vibration absorbing medium (claim 1).

The vibration absorber may be provided on any member as long as it vibrates with the high speed rotation of the inner tank, but is preferably provided on the outer tank directly connected to the inner tank via driving means. In this case, it is preferable to provide it on the inner surface of the bottom of the outer tank or on the outer surface of the bottom. Further, regarding the provision on the bottom outer surface, the enclosure may be formed integrally with the outer tank by using a rib wall provided upright on the bottom outer surface (claim 4). Furthermore, the base for attaching the driving means attached to the bottom outer surface of the outer tank may be formed of a vibration absorber.

Since the vibration of the inner tank and the outer tank and the noise associated therewith are eventually transmitted to the outside as the vibration of the outer frame, it is also effective to provide a vibration absorber on the outer frame. .

[0013] The enclosure of the vibration absorber may have a single structure, or may have a composite structure by appropriately providing a partition or by forming a cellular structure from the beginning. (Claims 7 and 8).

[0014]

The vibration absorber according to the present invention is designed to reduce the vibration by converting the vibration of the vibrating member provided with the vibration absorber into a granular motion of the vibration absorbing medium in the enclosure. That is,
When the vibrating member vibrates, it is transmitted to the vibration absorbing medium,
As a result of the vibration-absorbing medium moving in the enclosure, the vibration energy of the vibrating member is absorbed as the kinetic energy of the vibration-absorbing medium and the friction energy associated therewith, so that the vibration of the vibrating member and the noise caused thereby are reduced.

In this vibration absorber, the vibration of the vibrating member can be converted into the motion of the vibration absorbing medium at a high conversion rate because the vibration absorbing medium is granular, and a higher vibration reduction effect can be realized. In particular, the effect of reducing high frequency components is high, and it is effective in reducing harsh noise.

The vibration absorber also reduces vibration by increasing the rigidity of the vibrating member by attaching the vibration absorber.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below. In the following description, portions common to the above-described structure will be denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 1 shows an example in which a vibration absorber 21 is attached to the inner surface of the bottom of the outer tub 4. This vibration absorber 21 is shown in FIG.
As shown in FIG. 3, a plurality of granular vibration absorbing media 22 are sealed in a sealing chamber 24 provided by a sealing case 23 formed in a flat annular shape. You are free to exercise.

As the granular vibration absorbing medium 22, for example, metal particles, ceramic particles, and mineral particles can be used. The amount of these sealed chambers 24 is determined by the relationship with the particle size.
If the particle size is large, the quantity may be small, and if the particle size is small, the quantity is large.

The enclosing case 23 causes the vibration-absorbing medium 22 to move in the enclosing chamber 24. The motion of the vibration-absorbing medium 22 is caused by the vibration of the outer tub 4 transmitted through the wall surface of the enclosing case 23. What is done. Therefore, it is preferable that the wall surface of the enclosing case 23 is as thin as possible so that the vibration of the outer tub 4 can be easily transmitted to the vibration absorbing medium 22. In addition, the wall surface of the enclosing case vibrates with the movement of the vibration absorbing medium 22 and thereby contributes to activation of the movement of the vibration absorbing medium 22. Therefore, it is preferable that the wall of the enclosing case is also formed thin.

Although the vibration absorber 21 has a single enclosing chamber, it may have a cell structure. That is, as shown in FIG. 4, a plurality of tubular sealing chambers 26 are formed in a sealing case 25 formed in a block shape, and the vibration absorbing medium 22 is sealed in each sealing chamber 26. As shown in FIG. 5, a plurality of cell holes formed in a honeycomb shape in a block-shaped core member 27 using a drill or the like are closed with upper and lower wall plates 29 to form an enclosure chamber 30 having a cell structure.

The embodiment shown in FIG. 6 is an example in which a vibration absorber 21 similar to the embodiment of FIG.
It is provided in a sandwich shape between the base 5. In the case where the outer tank 4 is provided outside the bottom as described above, a structure as shown in FIG. 7 may be employed. That is, the outer tank 31 is integrally provided with a vibration absorber 32 in a rib structure on the bottom outer surface. The vibration absorber 32 having the rib structure has a cell structure as shown in FIG.

In the embodiment shown in FIG. 9, the base for mounting the driving means is a vibration absorber 21 having the structure shown in FIGS.
This is an example of forming with. FIG. 10 shows an example in which the vibration absorber 33 is mounted on the outer surface of the bottom of the outer tank. In this example, the driving means has a direct motor connection structure.

The embodiment shown in FIG.
4 is attached, and the sound radiated to the outside via the outer frame 2 is reduced.

[0025]

As described above, according to the present invention, a vibration absorber having a structure in which a granular vibration absorbing medium is enclosed in a sealing chamber is provided in a vibrating member, and the motion of the granular vibration absorbing medium in the sealing chamber is provided. As a result, the vibration energy of the vibrating member is absorbed to reduce the vibration, so that a remarkable vibration reduction effect can be realized.

[Brief description of the drawings]

FIG. 1 is a sectional view of an electric washing machine according to an embodiment in which a vibration absorber is provided on the inner surface at the bottom of an outer tub.

FIG. 2 is a plan view of a vibration absorber having a single-structured sealing chamber.

FIG. 3 is a sectional view taken along the line AA in FIG. 2;

FIG. 4 is a cross-sectional view of a vibration absorber having a sealing chamber having a cell structure.

FIG. 5 is a cross-sectional view of a vibration absorber having a cell structure according to another example.

FIG. 6 is a diagram showing an electric washing machine according to an embodiment in which a vibration absorber is provided on the outer surface of the bottom of the outer tub.

FIG. 7 is a cross-sectional view of an outer tank having a rib-structured vibration absorber.

FIG. 8 is a bottom view of the outer tank shown in FIG. 7;

FIG. 9 is a sectional view of an electric washing machine according to an embodiment using a vibration absorber as a base.

FIG. 10 is a sectional view of an electric washing machine according to an embodiment of a motor direct connection type.

FIG. 11 is a sectional view of an electric washing machine according to an embodiment in which a vibration absorber is provided on an outer frame.

FIG. 12 is a sectional view of a conventional standard fully automatic electric washing machine.

FIG. 13 is a sectional view of a conventional standard two-tub type electric washing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner tank 2 Outer frame 4 Outer tank 5 Base 6 Driving means 21 Vibration absorber 22 Vibration absorbing medium 24 Enclosure chamber

Continued on the front page (72) Inventor Tamotsu Kamori 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Factory, Hitachi, Ltd. (72) Inventor Isao Hiyama 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture (72) Inventor Hiroyuki Yamamoto 1-1-1 Higashitaga-cho, Hitachi City, Ibaraki Prefecture Inside the Taga Factory, Hitachi, Ltd. (56) References JP-A-2-286934 (JP, A) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) D06F 37/12 D06F 49/06 F16F 15/02

Claims (2)

(57) [Claims] 1. A granular vibration-absorbing medium comprising: an inner tank for high-speed rotation for dehydration; an outer tank for receiving water covering the inner tank; a driving means for rotating the inner tank; and an outer frame for covering the whole. An electric washing machine in which a vibration absorber, which is sealed in a sealing chamber in such a manner as to allow appropriate movement, is mounted on the inner surface at the bottom of the outer tub. 2. A bottom outer surface of an outer tub comprising an inner tub for high-speed rotation for dehydration, an outer tub for receiving water covering the inner tub, a driving means for rotating the inner tub, and an outer frame for covering the whole. An electric washing machine in which a rib structure is provided upright, a sealing chamber is formed using rib walls, and a granular vibration-absorbing medium is sealed in the sealing chamber in a state capable of appropriate movement.