JPS59115082A - Stirrer blade for washer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an agitating blade disposed at the inner bottom of a washing tub.

Conventional Structure and Problems Traditionally, in Japan, so-called whirlpool washing machines have been put into practical use, in which stirring blades are installed at the bottom of the washing tub, and the rotation generates a whirlpool agitating water stream to wash clothes. ing.

In this type of washing machine, as shown in FIG.
is installed in a manner protruding from the bottom c of the washing tub b into the tub b. Therefore, the cleaning power of the part where the stirring blade a directly contacts the clothes is very high, while the cleaning power of the part of the clothing away from the stirring blade a is weak. As the spots and uneven washing become larger, the parts of the clothes that directly come into contact with the agitating blades a become more damaged.

Furthermore, the outer diameter d of the stirring blade a is compared to the inner diameter d2 of the washing tub.
1 is about 1/2 or less, and the rotation speed is set to about 300 revolutions per minute or more, so that the small diameter stirring blade a protruding into the washing tub rotates at high speed. Then, hook the part of the clothing that comes directly into the stirring blade a and turn it.
This part or a part close to that part is twisted to some extent to apply agitating force to the entire clothes, especially the clothes above the washing tub b.

For this reason, the clothes are often twisted, and it takes a lot of effort to take them out after washing or dehydrating them.

In addition to the above, the stirring blade is housed in a non-protruding state from the bottom of the washing tub, and there is also a concave base plate whose depth gradually increases from the outer periphery toward the center, and a center portion on the top surface of this base plate. An agitating blade for a dehydrating/washing machine is proposed, which is composed of a pterygoid ridge, which has the largest number of ridges, and the degree of ridges gradually decreases toward the outer periphery, and whose top is continuous with the inner bottom surface of the washing tub. has been done.

It is predicted that this stirring blade will have the effect of preventing the laundry from shifting in the washing tub, reducing vibrations during spin-drying, and preventing damage to the laundry. However, in order to improve the cleaning effect, it is necessary to form a water flow from the center side toward the outer periphery between the fecal ridges, but the above-mentioned conventional structure does not specifically disclose this point. However, there are still concerns regarding cleaning.

OBJECTS OF THE INVENTION The present invention provides an agitating blade for a washing machine that reduces twisting of clothes and has an excellent cleaning effect.

Structure of the Invention In order to achieve the above object, the present invention has a central part that rises in a spherical shape, descends outward from this spherical part to form a horizontal surface, and further extends from the horizontal surface toward the outer periphery and starts on a tangent line. A base with a curved surface that rises in an arc, and a base that is installed on the top surface of this base, and has a height change from the center to the outer periphery, and the neck is moved from a position near the midpoint or a position slightly closer to the outer periphery. The outer diameter is approximately horizontal, and the outer diameter is relative to the inner diameter of the washing tub. The rotation speed is set to about 70 to 80%, and the rotation speed is set to about 200 revolutions/minute.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

Figure 2 shows the overall configuration of a fully automatic washing machine, where 1 is the outer panel of the main body, 2 is a washing tub and dewatering tank (hereinafter referred to as a washing tank) with a large number of dehydrating holes 2, and 4 is a washing tub. 2 is a stirring blade rotatably installed on the inner bottom, 5 is a water receiving tank, 6 is a balancer for balancing during dehydration, and 7 is an operation panel containing switches, etc.

8 is a motor, and this rotational force is generated by a pulley 9 and a belt 1.
0, through the pulley 11, is further decelerated by the deceleration drive mechanism section 12, and is transmitted to the stirring canopy 4.

13 is a damper for absorbing dewatering vibrations, 14 is a rod, 16 is a drain valve, and 16 is a drain hose.

The overall configuration has been described above, and next, the specific configuration of the stirring blade 4 will be explained with reference to FIGS. 3 to 6.

The stirring blade 4 has a hemispherical part 17 whose upper surface center part is raised in a spherical shape, and a base surface 18 descends toward the outer circumference, descends a certain distance, and becomes a horizontal surface 19.
A base 23 having a curved surface 22 that curves upward tangentially and gently rises from a position near the midpoint between the center portion 20 and the outer peripheral portion 21, and a plurality of bases formed integrally or integrally on the base 23. The peaks 24 have a height change between the center part 20 and the outer peripheral part 21, and the top part 24 has a height change between the center part 20 and the outer peripheral part 21.
6. From a position 26 near the intermediate point or slightly toward the outer periphery, the outer direction is connected to the base 23 at a substantially horizontal position 27, and from a position 26 near the intermediate point or slightly toward the outer periphery.
5 toward the center 20, the top 26 descends 28 and has a lowest point 29 approximately midway between the position 26 and the center 20;
Further, it rises 30 toward the center portion 20 from there and comes into contact with the hemispherical portion 17 .

The shapes of the base 23 and the tops 26 of the peaks 24 are as described above, and in particular, the cross-sectional shape of the peaks 24 is seen in (A) to (H) of FIG. 5 corresponding to A-H in FIG. That's right.

The change of the top part 26 with respect to the base 23 is as follows, the top part 26 and the base 23 are connected by a suitable curved surface 31, and the height of the top part 26 with respect to the base 23 is the highest in the D part,
The width of the peak 24 at the portion in contact with the base 23 is the widest at the portion C, which is slightly farther toward the outer periphery than the portion D. The shape becomes narrower in both the inward and outward directions from the C portion. Here, point D is approximately the middle point between the center and the outer periphery or a point slightly toward the outer periphery.

In addition, the height of the hemispherical part 17 at the center of the base 23, the outer peripheral part 21
The height of the horizontal part 27 is the same as that of the outer peripheral part 21.
A slight height difference may be provided with respect to the height of .

In addition, the outer diameter d1 of the stirring blade 4 is equal to the inner diameter d2 of the washing tub 2.
If so, it should be about 0.7 to 0.8 and installed at the bottom of the washing tub 2 as shown in FIG. Here, 32 is a fitting part attached to the rotating shaft, and 33 is a boss.

The operation of the above configuration will be explained. The stirring blade 4 is rotated clockwise, paused, counterclockwise, and rotated at a relatively low speed at approximately 200 revolutions per minute or less.

The effects of cleaning the clothes being washed can be roughly divided into two: the effect of the water flow generated by the rotation of the agitating blades 4, and the effect of the piles 24 of the agitating blades 4 directly moving the clothes.

The water flow generated by the stirring blades 4 is as shown by the arrows in FIGS. 2 and 4, and the water that enters from the hemispherical part 17 of the center part 20 descends to reach the horizontal surface 19, where it reaches the horizontal surface 19. The water rises from there to reach the wall surface of the washing tub 2, and further rises along this, becoming a large arcuate water flow above the stirring blades 4. In other words, the feature is that it spreads outward along the base surface from the center 20 to the outer periphery 21 of the stirring blade 4, and as it rises, it creates a large arcuate water flow, which was previously put into practical use. , this is a big difference from the small vortex water flow seen in Figure 1.

Next, the effect of the pile of stirring blades 4 on directly moving the clothes will be described. Since no ridges are formed on the hemispherical portion 17 of the middle part of the base 23, clothes will not get caught in this portion, and the top 26 of the ridges 24 is formed against the outer periphery 21 of the stirring blade 4.
Since it is the same or has a slight difference in height, there is no need to hang clothes directly on it.

Further, the top portion 26 of the mountain 24 extends from the center portion 20 to the outer peripheral portion 21.
From a position near the midpoint or a position slightly closer to the outer periphery, the outward direction is approximately horizontal 27, and the part of the stirring blade 4 with the highest circumferential speed is like this, and the rotational speed is Since the speed is low, it is less likely that clothing will be caught directly and turned.

Furthermore, since there is a height difference at the top 26 of the mountain 24,
A single, uniform agitation causes it to grow.

In this way, the outer diameter d1 of the stirring blade 4, which has an effect based on its shape, is approximately 70 to 80% of the inner diameter d2 of the washing tub 2.
By increasing the number of rotations and keeping the number of revolutions to about 200 revolutions/minute or less, a wide and slow water flow is generated in the washing tub 2, producing the effect of slowly moving the clothes to be washed.

Originally, in a whirlpool type washing machine, the action of moving the clothes to be washed consists of two main elements: the element that moves the clothes in the water flow, and the element that rotates the clothes by directly catching them on the stirring blades 4, and this produces the cleaning effect. be.

So, to discuss the effects brought about by these two elements, if the element that moves with the water flow is strong, the clothes will be less likely to get damaged, and there will be less kinking and tangles, but the cleaning power will be weak. A typical example of this is a water jet washing machine pressurized by a pump.

On the other hand, if the element of directly catching and rotating the clothes with the agitating blades 4 is strong, uneven washing and damage to the clothes will be large, and kinks and tangles will be large, but on the other hand, the cleaning effect will be large.

It is desirable to maintain a balance between the above two factors, to minimize damage to clothes, to reduce twisting and tangling of clothes, and to ensure basic cleaning power.

In this embodiment, compared to conventional whirlpool type washing machines, the element of washing effect by water stream is increased, and the element of directly hooking clothes on clothes and stirring is reduced.

By adopting the configuration of the above embodiment, as shown in the following table, when cleaning efficiency (cleaning degree) is maintained at the same level as conventional products, uneven cleaning, clothing damage, kinking, and tangling of clothing are reduced. It was made.

In addition, the cleanliness mentioned here is based on electric washing machine JIS-C-9.
606, and the unevenness of cleaning is based on the standard deviation of the cleanliness of 40 contaminated cloths after 4 washing tests, and the damage of clothes is determined by the standard deviation of the cleanliness of 40 contaminated cloths. Weight loss when washing 20 times (%)
This shows that.

Next, FIG. 6 shows another embodiment in which the shape of the crest 24 is slightly different from this embodiment, and is located at a position approximately in the vicinity of the midpoint between the center portion 20 and the outer peripheral portion 21 or slightly outward. 34
outwardly with its top 26 horizontally and above position 3.
4, inwardly from the center 2 at the position 34, facing downwards.
It is constructed so as to be connected to the base plate 23 in the vicinity of approximately the midpoint with respect to 0, and this also has the same effect as the present embodiment. Further, in FIG. 6, the configuration other than the above is the same as that shown in FIG. 4, and the explanation thereof will be omitted.

In this example, we have explained the case where a fully automatic washing machine is equipped with an agitating blade, but the same effect can be obtained even if it is installed in the washing tub of a two-tub washing machine that is equipped with a washing tub and a dewatering tub. It will be done. In this case, the washing tub usually has a substantially rectangular planar shape, and the inner diameter d2 of the washing paddle described above can be replaced with the distance across opposite sides of the square washing tub, and the same effect can be obtained. It is something to play.

Effects of the Invention As is clear from the above embodiments, according to the present invention, the influence of the water flow can be increased compared to the conventional method, and the effect is reduced by preventing clothes from being caught directly on the stirring blades, which reduces the rotation effect. It maintains detergency at a high level, suppresses uneven washing, damage to clothes, kinks, and tangles, and exhibits well-balanced washing performance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view showing the entire structure of a conventional washing machine, Fig. 2 is a longitudinal cross-sectional view showing the overall structure of a washing machine according to an embodiment of the present invention, and Fig. 3 is a plane showing the stirring blades thereof. 4 is a sectional view taken along the line X-0-Y in FIG. 3, FIGS. FIG. 7 is a sectional view showing another embodiment. 2... Washing tub, 4... Stirring blade, 17.
... Hemisphere part, 19 ... Horizontal plane, 20 ...
...Central part, 21...Outer part, 22...Curved surface,
23...Foundation, 24...Mountain, 26...
... Top, 27 ... Horizontal part, 28 ... Descending part, 29 ... Lowest point.

Claims (2)

[Claims] (1) A base with a spherical rise in the center, a curved surface that descends outward from the spherical part to form a horizontal plane, and then rises in an arc starting from a tangent to the outer circumference from the horizontal plane, and this base It is provided on the top surface and has a height change from the center to the outer periphery, and the top is approximately horizontal from a position near the midpoint or a position near the barge or the outer periphery outward, and from a position near the midpoint to a position near the outer periphery. It is equipped with multiple peaks that descend from the outer circumference to the center, and the outer diameter is approximately 70 to 80% of the inner diameter of the washing tub.
The stirring blade for a washing machine is set at a rotation speed of about 200 revolutions/minute or less. (2) The tops of the plurality of mountains are approximately horizontal from a position near the midpoint between the center and the outer periphery of the base or a position slightly outward, and the tops are approximately horizontal outward from a position near the midpoint or slightly outward. The structure is configured such that it descends around the center from a position closer to the center, and has a lowest point approximately halfway between the center and a position near the intermediate point, and further rises toward the center from the lowest point to reach the center. The agitating blade for a washing machine according to claim 1, wherein the agitating blade is continuous with the spherical part of the spherical part and has a mountain formed except for the spherical part above the spherical part.