JPH035197B2 - - Google Patents

Description

[Detailed description of the invention] (b) Industrial application fields The present invention relates to a washing tub of a washing machine.

(B) Prior Art As shown in FIG. 4, a method in which a large number of ribs 52 are provided vertically on the inner wall of a washing tub 51 to enhance the washing effect is disclosed in Japanese Utility Model Publication No. 55-44625, etc. .

However, instead of rubbing the laundry with the ribs 52 to improve cleaning power, this method uses the ribs 52 to reduce the movement of the laundry.
inhibit by. Therefore, it is difficult for the laundry to move, especially to turn over in the vertical direction, and washing spots are likely to occur. In addition, since the laundry does not move much, it is difficult to visually indicate that the laundry is being washed.

(c) Purpose of the invention The purpose of the present invention is to increase the movement of laundry during washing and to prevent washing spots.

(d) Structure of the Invention The washing machine of the present invention has a plurality of protrusions formed on the inner circumferential wall of the washing tub, which slope from the upper part to the lower part, at intervals sufficient to allow the laundry to enter. Furthermore, the degree of protrusion of the protruding portion is increased toward the upper portion.

In other words, when the washing tub rotates on the water flow,
Since the laundry moves upward and downward along the inclined protrusion, the movement of the laundry becomes active.

Further, since the degree of protrusion of the protruding portion is greater in the upper part, the laundry that has moved downward is more likely to rotate, and the laundry that has moved upward is less likely to float on the water surface.

(E) Embodiments Examples of the present invention will be described based on the drawings.
In FIGS. 1 and 2, 1 is a machine frame of a fully automatic washing machine, and has an outer tub 2 installed therein. This outer tank 2
A cylindrical inner tank (washing and dewatering tank) 3 with a wide taper at the top is installed inside the tank, and a balance ring 4 is attached to the periphery of the opening of the inner tank 3. At the bottom of the inner tank 3, there is a blade chamber 5 with a large diameter that extends over the entire bottom.
is recessed, and rotary blades 6 are pivotally supported so as to be located within this blade chamber 5. The rotary blade 6 bulges upward from its large-diameter bottom in a substantially conical shape, and the height of its top is lower than the lowest water level during washing. 7 is rotor blade 6
and a bearing section that supports the inner tub 3; 8 is a reducer that reduces the rotation of the motor;
Intermittently reverse rotation at about 180rpm. Incidentally, during dehydration, the inner tank 3 and the rotary blade 6 rotate at high speed in one direction.
9 is a dehydration hole.

The inner circumferential wall of the inner tank 3 is provided with a large number of protrusions 10 formed by protruding inward in a triangular shape from the upper opening to the bottom of the tank. The protrusions 10 have a degree of protrusion that gradually increases from the bottom to the top, are arranged at equal intervals around the entire circumference of the inner tank, and are uniformly inclined at an α degree from the bottom toward the upper opening. are doing. This angle α is determined in consideration of the shape of the rotary blade 6, and is set to α=30 degrees to 45 degrees in this embodiment.

Further, the rotary blade 6 has three blades 11 on the ridgeline.
are formed protrudingly at intervals of 120 degrees, and the blades 11 thereof are slightly twisted in the direction of arrow A so as to match the inclination direction of the protrusions 10. When the rotary blade 6 rotates forward in the direction of arrow A by twisting the blade 11,
A vertical water flow is induced in the inner tank 3, and when reversely rotated, a horizontal water flow is induced.

Thus, washing is performed by reversing the rotary blade 6 at low speed and in short cycles (rotation for 1.2 seconds, pause for 0.7 seconds). At that time, the laundry is washed while being rotated by the water flow generated by the rotation of the rotary blade 6, and at that time, due to the contact friction with the protrusion 10,
Cleans more effectively. And the rotary blade 6
When the laundry rotates in the direction of inclination of the protrusion 10 (direction of arrow A), the laundry rides the vertical water flow and moves upward along the upward inclination of the protrusion 10. Further, when the rotary blade 6 rotates in the direction opposite to the arrow A, the laundry rides the horizontal water flow and moves downward along the downward slope of the protrusion 10.

Now, among the washing machines currently on the market, in response to the user's desire to wash clothes softly without any clinging, a large rotary blade 6 with a bar etc. protruding from the center is rotated at low speed and in short cycles. Although this method does not satisfy the above-mentioned requirements, it has a lower cleaning power and is less likely to turn the laundry upside down.

However, in this embodiment, by providing the inclined protrusion 10 in the inner tub 3, the laundry is frequently turned upside down, and even thick fabrics such as jeans can be thoroughly washed.

In addition, since the protrusion 10 is made to protrude gradually higher from the bottom to the top, the laundry that has moved downwards can easily rotate, and the laundry that has moved upwards can be prevented from floating on the water surface. It helps prevent spots.

Furthermore, since the balance ring 4 is supported by the protrusion 10 and can be screwed from the back side of the protrusion 10 (arrow B), attachment of the balance ring 4 is easy.

Note that the protruding portion 10 is different from the protruding portion 1 due to molding convenience.
0 comrades are arranged to maintain certain dimensions so that they do not overlap.

Next, FIG. 3 shows two points of the protrusion 10 in FIG.
When the two surface dimensions a and b are set such that a>b, with such a configuration, the area of the surface with dimension a that the laundry comes into contact with becomes larger, so the laundry can move further upwards, Since the slope of the dimension b surface is steeper, the laundry that comes into contact with the surface is more likely to be guided and therefore more likely to move downward. As a result, the laundry is turned over more actively.

In the above embodiments, the inclination angle α of each protrusion 10 is the same, but if the inclination angle α is varied for each protrusion 10, different cleaning effects can be expected. Moreover, by providing not only the protrusions 10 that are inclined in the same direction but also those that are inclined in the opposite direction, the laundry can be turned upside down without the need for the rotary blades 6 to be turned over.

In other words, various cleaning effects can be expected by combining protrusions having various inclination angles α.

Further, the protrusions 10 may be formed of small protrusions provided intermittently.

(f) Effects of the Invention In the present invention, when the laundry rotates on the water flow, it moves upward or downward along the inclined groove or protrusion, so that the movement of the laundry is prevented. Become active.

Further, since the degree of protrusion of the protruding portion is increased toward the upper part, the laundry that has moved downward is more likely to rotate, and the laundry that has been moved upward is less likely to float on the water surface.

Therefore, cleaning power can be further improved and washing spots can be prevented. Furthermore, since the active movement of the laundry can be visually expressed to the user, it gives a sense of security regarding the cleaning effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of the main parts of a washing machine according to the present invention, FIG. It is a sectional view of a washing machine. 1...Machine frame, 3...Washing tub, 6...Rotor blade, 1
0... Projection.

Claims (1)

[Claims] 1 A machine comprising a machine frame, a washing tub installed inside the machine frame, a rotary blade disposed at the bottom of the washing tub, and a drive motor for rotating the rotary blade, A plurality of protrusions that slope from the upper part to the lower part are formed on the peripheral wall at intervals sufficient to allow the laundry to enter, and the degree of protrusion of the protrusions is increased toward the upper part. A washing machine featuring