JPH0217198B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a dehydrating and washing machine in which a pulsator is eccentrically arranged in a rotating tub.

[Technical background of the invention]

Conventionally, in order to improve the cleaning effect, a pulsator is placed eccentrically at the inner bottom of a rotating tank, and the rotation of a washing shaft passing through the center of the rotating tank is transmitted to the pulsator via a gear mechanism. A washing machine is provided.

[Problems with background technology]

However, in the above configuration, the pulsator, gear mechanism, etc. are eccentric at the inner bottom of the rotating tank, so the center of gravity of the rotating tank is biased toward the pulsator arrangement side, which tends to cause abnormal vibrations during dewatering operation in which the rotating tank is driven to rotate. There was a problem.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a dehydrating and washing machine that can offset as much as possible the deviation of the center of gravity of a rotating tub and effectively prevent abnormal vibrations from occurring during dehydrating operation.

[Summary of the invention]

The present invention provides water holes for the circulation path in the bottom plate of the rotating tank.
The opening area per unit area is formed to be larger on the side where the pulsator is placed, and the center of gravity of the bottom plate is biased toward the side opposite to the side where the pulsator is placed, thereby canceling out as much as possible the deviation of the center of gravity due to the eccentric placement of the pulsator. It has the following characteristics.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. Reference numeral 1 denotes an outer box of a washing machine that also serves as a dehydrator. Inside this box, a water tank 3 is elastically suspended via a hanging rod 2 of an elastic support mechanism. A rotating tank 5 having a large number of dehydrating holes 4 and serving as both a washing tank and a dehydrating tank is provided. Reference numeral 6 denotes a housing fixed to the outer bottom of the water receiving tank 3, into which a hollow dehydration shaft 7 is rotatably inserted and supported, and a washing shaft 8 is attached to the dehydration shaft 7.
is rotatably inserted and supported. A driven pulley 9a of a belt transmission mechanism 9 is attached to the washing shaft 8, and the driven pulley 9a and the dewatering shaft 7 are connected by a well-known clutch mechanism 10, thereby attaching the driven pulley 9a to the mounting plate 11 on the outer bottom of the water receiving tank 3. The rotation of the fixed motor 12 is selectively transmitted to the dewatering shaft 7 and the washing shaft 8. On the other hand, a recess 13 for storing a pulsator is formed at the bottom of the rotary tank 5 eccentrically by a predetermined amount, and its open lower surface is closed by fixing a bottom plate 14 to the outer bottom of the rotary tank 5 with pin screws 15. are doing. The bottom plate 14 is made of a relatively thick metal plate with high rigidity to reinforce the rotating tank 5.
As shown in FIG. 3, the recess 13 is formed into a substantially rectangular shape with the eccentric side elongated, and is fixed symmetrically with respect to the center of rotation of the rotating tank 5. Then, the upper end of the dewatering shaft 7 protruding into the water receiving tank 3 is inserted and fixed into the through hole 16 formed in the bottom plate 14 at a portion corresponding to the center of the rotating tank 5, thereby directly connecting the rotating tank 5 to the dehydrating shaft 7. state. A gear case 17 is located approximately in the center of the recess 13 and is fixed to the bottom plate 14 with a predetermined gap therebetween, and meshes with a drive gear 18 attached to the upper end of the washing shaft 8. The driven gear 19 is watertightly covered. 20 is a pulsator, this is gear case 1
The pivot shaft 1 of the driven gear 19 projects upward from 7.
It is attached to 9a. Reference numeral 21 denotes a large number of blades provided on the back surface of the pulsator 20, for example, by integrally molding therewith. Accordingly, a so-called pumping action is performed to send water in the centrifugal direction of the pulsator 20. Therefore, 22 is the bottom plate 14
The water in the water receiving tank 3 is transferred to the recess 13 of the rotating tank 5.
As shown in FIG. 3, there are a number of holes for water to flow into the pulsator 20, which are formed in a portion of the bottom plate 14 that faces the lower surface of the gear case 17 in the eccentric direction (to the left in the figure) of the pulsator 20. form large,
Therefore, the opening area per unit area of the water passage hole 22 is made larger on the side where the pulsator 20 is arranged. On the other hand, 23 is a circulation path provided in the rotating tank 5, and this is a circulation path that is connected to the pulsator 20 on the peripheral wall of the rotating tank 5.
A cover 24 having a substantially U-shaped cross section extending vertically extends over the side opposite to the arrangement side of the rotary tank 5, and the lower end communicates with the recess 13, and the upper end is opened inside the balance ring 25 at the upper end of the rotating tank 5. I'm letting you do it. A filter 26 is detachably attached to the opening at the upper end of the circulation path 23, and is provided to collect lint and the like from the water discharged from the circulation path 23.

Next, the operation of the above configuration will be explained. Put the laundry together with the detergent into the rotating tub 5, and turn the time switch 28.
When set, a water supply valve (not shown) opens and water is supplied into the rotary tank 5 and water receiving tank 3. When a predetermined water level is reached, a water level switch (not shown) is activated, the water supply valve is closed, and the motor 12 is started. As a result, the washing shaft 8 rotates, and the pulsator 20 is rotationally driven via the drive gear 18 and the driven gear 19. A whirlpool water flow is generated in the rotary tub 5 by the stirring action of the pulsator 20, and the laundry is thoroughly agitated and washed by the complicated water flow generated by the eccentrically arranged pulsator 20. At the same time, the water in the recess 13 rises through the circulation path 23 and is discharged into the filter 26 by the pumping action of the blades 21 on the back of the pulsator 20, passes through the filter 26, and returns to the rotating tank 5 and the water receiving tank 3. At the same time, the water in the water tank 3 is returned to the water passage hole 22 of the bottom plate 14.
It is sucked into the lower side of the pulsator 20 through the pulsator. By repeating such an operation, the water in the rotating tank 5 is forced to circulate through the water receiving tank 3 and the circulation path 23, and when the circulating water passes through the filter 26, the lint contained in the water is removed. It is captured by the filter 26. After this detergent washing process has been carried out for a predetermined period of time, a draining process begins, the drain valve is opened, and the water in the rotary tank 5 is discharged to the outside of the machine via the drain hose 27. Thereafter, the process moves to a dewatering process, in which the clutch mechanism 10 is switched and the motor 12 is activated, so that the rotary tub 5 is driven to rotate at high speed, and the water in the laundry is centrifugally dehydrated. By the way, since the water passage holes 22 are formed in the bottom plate 14 so that the opening area per unit area is large on the side where the pulsator 20 is arranged, the center of gravity of the bottom plate 14 is located opposite to the center of rotation of the rotating tank 5. It's leaning to the side. Therefore, pulsator 20
Due to the eccentric arrangement of the pulsator 20, the deviation of the center of gravity that originally occurs on the side where the pulsator 20 is arranged is offset by the eccentric center of gravity on the opposite side of the bottom plate 14, and the center of gravity of the entire rotating tank 5 is shifted to its center of rotation. It is possible to prevent abnormal vibrations of the rotary tank 5 as much as possible during the dewatering process. In general, in this type of washing machine in which the pulsator is eccentrically arranged, when the laundry finishes the draining process, the laundry is shifted to a part of the rotating tub 5 that is closer to the center line that passes between the center of the rotating tub 5 and the center of the pulsator 20. As a matter of fact, there is a tendency for the laundry to be located along the center line, and for this reason, strong force tends to act on the inner bottom of the rotating tub 5 along the center line direction due to the inertia of the laundry at the start of the spin-drying operation. In particular, in the embodiment, the bottom plate 14 is formed into a substantially rectangular shape that is long in the eccentric direction of the pulsator 20 (that is, the direction along the center line). This can be effectively dealt with using the bottom plate 14.
After such a dehydration process, the rinsing process in which water is stored in the rotary tank 5 again and the pulsator 20 is driven, the draining process, and the dehydration process are repeated several times in order to complete the entire process.

Note that the present invention is not limited to the embodiment described above and shown in the drawings; for example, as shown in FIG. If formed as shown in FIG. 2, the weight of the bottom plate 14 on the side opposite to the pulsator 20 will increase compared to the case where a plastic cover 28 is provided at the rising part of the circulation path 23 as shown in FIG. The center of gravity of the bottom plate 14 can be sufficiently moved to the side opposite to the pulsator 20 without having to shift it to the left side toward the pulsator 20, and the rising part of the circulation path 23 can be made into a smooth shape, thereby reducing flow path resistance. It is possible to reduce the

In addition, it goes without saying that the water passage hole 22 may be provided only on the side where the pulsator 20 is disposed, and various concrete modifications are possible in implementation.

〔Effect of the invention〕

As described above, the present invention has the effect of being able to offset as much as possible the deviation of the center of gravity due to the eccentric arrangement of the pulsator, and effectively preventing the occurrence of abnormal vibrations during dewatering operation.

[Brief explanation of drawings]

1 to 3 show an embodiment of the present invention,
Fig. 1 is an overall longitudinal sectional side view, Fig. 2 is an enlarged longitudinal sectional view of main parts, Fig. 3 is an enlarged bottom view of the rotating tank, and Fig. 4 is a partial enlarged longitudinal sectional view showing another embodiment of the present invention. It is a diagram. In the figure, 5 is a rotating tank, 14 is a bottom plate, 20 is a pulsator, 21 is a blade, 22 is a water hole, and 23 is a circulation path.

Claims (1)

[Claims] 1. In a rotary tank in which a pulsator is eccentrically arranged, water is sucked through a water hole formed in the bottom plate of the rotary tank by the pumping action of the blades provided on the back side of the pulsator and flows into the rotary tank. A dehydrating and washing machine, characterized in that a circulation path is provided, and the opening area per unit area of the water passage hole is made larger on the side where the pulsator is arranged.