JPH02144Y2 - - Google Patents

Description

[Detailed description of the invention] Technical field of the invention This invention rotates a washing tub having protrusions on the inner wall.
This invention relates to a washing machine that performs washing operations by repeatedly stopping suddenly.

Prior Art and its Problems Conventionally, this type of washing machine performs a cleaning action mainly based on collisions between the laundry and the protrusions and frictional force by intermittent operation of the washing tub. However, although the degree of cleaning is greatly influenced by the shape of the protrusions, this point has not been sufficiently considered, and the degree of cleaning is still insufficient and lacks concreteness compared to the conventionally well-known pulsator drive method. was.

Purpose of the invention This invention was made with the above points in mind.
The purpose is to provide a washing machine that can improve the degree of cleaning by having a specific configuration in which protrusions are associated with the washing tub.

Structure of the invention (summary) The present invention makes the shape of the protrusion provided on the inner wall of the washing tub approximately trapezoidal with a chevron-shaped cross section protruding inwardly, and also improves its thickness and the shape of the washing tub. The feature is that the ratio to the radius is set at approximately 1:3.

Embodiment of the Invention An embodiment of the invention applied to a dehydrating and washing machine will be described below with reference to the drawings. 1 is the outer box,
Inside the outer box 1, a water receiving tank 3 having a power transmission mechanism 2 fixed to the bottom thereof is elastically suspended from the upper part of the outer box 1. 4 is a washing tub which is housed inside the water receiving tank 3 and also serves as a cylindrical dewatering tank with a bottom. The side wall of this washing tub 4 has a large number of drainage holes, and the inner wall surface is provided with projections 5, which will be described later, and a balance weight 6 is fixed to the upper opening of the inner wall. A rotating shaft 7 is fixed to the bottom surface, and is connected via the power transmission mechanism 2 to the arrow A in FIG.
It is rotatably supported in the direction. 8 is water tank 3
With the motor fixed to the bottom of the motor pulley 9,
Power transmission mechanism 2 via belt 10 and pulley 11
power is transmitted to. A brake drum 12 is directly connected to the rotary shaft 7, and constitutes a brake device that brakes the rotating washing tub 4 in conjunction with a brake lever 13 operated by a magnet (not shown). Reference numeral 14 denotes a panel section provided at the rear of the upper surface of the outer box 1.

To explain the protrusion 5 in detail, the protrusion 5 has a substantially trapezoidal shape with a chevron-shaped cross section protruding inward from the washing tub 4, and its upper and lower ends are connected to the washing tub 4.
The lower end of the upper balance weight 6 and the washing tub 4
They are fixed and integrated with the side wall of the washing tub 4 by appropriate means such as welding or screwing, with a space between them and the bottom surface of the washing tub 4. In particular, as shown in FIGS. 2 and 3, the cross section of the protrusion 5 has a rounded tip 5a, a mountain shape formed by symmetrical side surfaces 5b and 5c, and has a thickness B which is the protrusion dimension. are the same for both the upper and lower parts of the protrusion 5. Further, the apex angle C of the chevron-shaped tip 5a is small at the top and large at the bottom. Therefore, the slopes of both side surfaces 5b and 5c of the protrusion 5 are the smallest and gentlest at the bottom of the protrusion 5, and gradually become steeper and steeper toward the top, with the largest inclination at the top. There is. Also, as shown in FIG. 4, the joint surface between the protrusion 5 and the washing tub 4 has a width D at the lower end
is the base, the width E at the top is the top, and the protrusion 5 is
It has a trapezoidal shape with the vertical length F as the side. The thickness B of the protrusion 5 is approximately 1/3 of the radius R of the washing tub 4, and the width D is approximately three times the thickness B, and the width D of the bottom, the width E of the top, and the sides. The ratio of the vertical length F is set to approximately 7:3:6, and the rake angle G at both ends of the base is set to 60 to 75 degrees.

Next, the operation of the above configuration will be explained.
During the washing operation, the washing tub 4 repeatedly rotates in the direction of arrow A in FIG. 1 and suddenly stops. While the washing tub 4 is rotating, the laundry is pushed by the side surface 5b of the protrusion 5 and is urged by the same A.
The protrusion 5 is rotated in the direction and is pushed up from the bottom to the top of the protrusion 5 along the slope of the side surface 5b. However, since the slope of the upper part of the side surface 5b becomes steeper than that of the lower part, the laundry is reversed and moved inward to the center of the washing tub 4, and the laundry is reversed. After a predetermined period of time, the brake device is activated to abruptly stop the washing tub 4, but the laundry continues to rotate in the direction of arrow A due to inertia caused by the water flow. For this reason, the laundry has protrusions 5
The laundry collides with the side surface 5c on the opposite side and is subjected to the same reversal action and frictional action as described above, and this is repeated to perform the washing operation, and in particular, the laundry subjected to the rotating action is caused to collide with the protrusion 5. Since a reversing action is added after the collision, effective cleaning with less uneven cleaning is performed. Therefore, the rotation action of the laundry is influenced by the shape of the protrusion 5, especially its thickness B, and if the thickness B is small, the protrusion 5 and the laundry will not be sufficiently connected to each other while the washing tub 4 is rotating. The tops 5a of the protrusions 5 rub against the surface of the laundry floating in the water, which cannot be contacted, and the rotation and collision effects are significantly reduced. Furthermore, if the thickness B of the protrusion 5 is large, the protrusion 5 can make sufficient contact with the laundry, but on the other hand, when the washing tub 4 suddenly stops, there will be a large resistance to the inertia of the water flow, and therefore it will not rotate due to inertia. The laundry collides with the protrusion 5 and immediately stops, making it impossible to obtain a sufficient cleaning effect. Furthermore, since the subsequent reversing action is insufficient, a good reversing action cannot be expected, and effective cleaning with less uneven washing cannot be expected.

According to this embodiment, however, by setting the thickness B of the protrusion 5 to approximately 1/3 of the radius R of the washing tub 4, the best cleaning effect was obtained as shown in FIG. Incidentally, the experimental conditions were as follows: The diameter of the washing tub 4 was 350 to 410 mm, and the thickness B of the protrusion 5 was 65 mm.
mm, the rake angle is 70 degrees, and the ratio of the widths D and E, which are the outer sides of the protrusion 5, which also contributes to the reversing action of the laundry, to the length F, is set to approximately 7:3:6.

In order to carry out the dewatering operation, a draining operation is performed after the above-mentioned washing process, and then the washing tub 4 is rotated at high speed in one direction to perform centrifugal dewatering. The rotational force transmission mechanism is as follows:
It has the advantage of being simpler in structure than the conventionally known pulsator drive system, which has a dual shaft structure of a pulsator shaft and a dehydration shaft.

As mentioned above, especially the thickness B of the protrusion 5 and the washing tub 4
It has been found that cleaning performance is greatly affected by changing the ratio between the radius R of It is possible to obtain an effective cleaning effect with less uneven washing.

Effects of the invention As described above, in a washing operation in which the washing operation is performed by repeatedly rotating and suddenly stopping a washing tub which has a substantially trapezoidal protrusion with a chevron-shaped cross section protruding inwardly on the inner wall of the washing tub, the protrusion By setting the ratio between the thickness of the washing machine and the radius of the washing tub to approximately 1:3, it is possible to obtain a good rotation effect on the laundry, thereby providing a washing machine with good cleaning effects and less uneven washing. You can.

[Brief explanation of the drawing]

Figures 1 to 5 show an embodiment in which the present invention is applied to a dehydrating and washing machine. FIG. 4 is an enlarged perspective view of the protrusions, and FIG. 5 is a diagram showing the relationship between the cleaning performance and the protrusions. In the figure, 4 is a washing tub, 5 is a protrusion, B is the thickness of the protrusion, and R is the radius of the washing tub.

Claims (1)

[Scope of utility model registration request] When washing is carried out intermittently by repeatedly rotating and suddenly stopping a washing tub having protrusions on the inner wall, the protrusions have a substantially trapezoidal shape with a chevron-shaped cross section protruding inward from the washing tub. In addition, the washing machine is characterized in that the ratio between the thickness and the radius of the washing tub is approximately 1:3.