JPS6028519B2 - Centrifugal dehydrator balance device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a balance device for a centrifugal dehydrator such as a one-coat type dehydrating washing machine, where load fluctuations and resulting unbalance changes are severe. be.

Conventional structure and problems In conventional dehydrators of this type, as a means to reduce the force generated due to eccentricity of the load with respect to the axis of the dehydration tank during rotation and the accompanying vibration noise. , a housing having a donut-shaped space is fixed around the opening of the dehydration tank, and a weight (fluid) is sealed in the housing, and when the vibration system's resonance rotation speed is exceeded, objects and weights (which cause unbalance in the tank) are fixed. A method is used to reduce vibrations by taking advantage of the property that the fluid (fluid) occupies a position facing each other.

Here, to explain this property, in Figure 1, the height Hb from the center of gravity G of the vibration system to the weight (fluid), the centrifugal force Fb due to the weight (fluid), and the weight ′OG of the vibration system to the laundry The height ratio to the center of gravity Ga when the laundry is unbalanced, and the centrifugal force Fa when the laundry is unbalanced.
The necessary and sufficient condition for no vibration is Fa=Fb...(1}
(Swirling vibration = 0) Fa・Length=FbHb...[2
l (swing vibration = 0), but at first glance '1), (21
It can be seen that it is impossible for both formulas to coexist.

Assuming that the amount of unbalance of the laundry changes in a variety of ways and can change up to exceeding the total weight of the weight (fluid) in the housing, Fa is 0 ~ Fa > Fb, and when Fa = 0, that is, the amount of unbalance of the laundry When the fluid is uniformly distributed around the axis of the dehydration tank, the whirling vibration becomes 0, the fluids interact with each other and become uniformly distributed, and the oscillating vibration also becomes 0.

Therefore, Fa=Fb=0, therefore, Fa・Ha=Fb
・Hb=0. When the unbalanced amount of the laundry increases and Fa = Fb 0, that is, when the minimum required Fa is reached so that the fluid concentrates in one place, the whirling becomes the minimum. , Marriage compulsion M is M=Fb・H
b-Fa・ratio: Fb(Hb-Ha).・Glue and second
A rubbing vibration shown at point a of the characteristic opening in the figure is generated.

Again, Fa increases due to the unbalance of the laundry and Fb.
Hb=Fa・day...When (4) is reached, the vibration becomes 0 as shown in b in the characteristic section.

However, since Fa>Fb, the whirling vibration is not zero. When the unbalance increases again, {Fa>F
bFa·ratio>Fb·Hb}, and the vibrations, both the whirling vibration and the shifting vibration, increase rapidly.

Furthermore, at a rotation speed below the resonance point, the unbalance and the position of the fluid coincide, which also has the disadvantage of promoting an increase in whirling and steering vibration. As shown in Figure 2, the characteristics are superior in the large unbalance region compared to the Samurai Ha when a solid inertia ring method is used, but the vibration is large in the low unbalance region. Due to reasons such as large vibrations below the resonance point,
A device with a large change in the amount of unbalance inevitably has disadvantages in practical terms.

Purpose of the Invention The present invention solves the above-mentioned problems, and has a simple structure that provides an automatic balance function that can handle unbalance, thereby reducing vibration and noise. The purpose is to demonstrate excellent vibration isolation performance in this area.

Structure of the Invention In order to achieve the above object, the present invention forms a housing having a donut-shaped space around a rotatable dehydration tank, and in this housing contains a fluid and a plurality of movable parts that move due to the movement of the fluid. By accommodating a floating partition plate,
The purpose of this is to use a floating partition plate to delay the rapid gathering of fluid in one location, suppress vibrations in the vibration system, or simplify the configuration.

Description of examples Examples of the present invention will be described below.

In FIG. 1 mentioned above, 1 is a water tank in which a washing tub/dehydration tank 2 (hereinafter simply referred to as a dehydration tank) is rotatably arranged, 3 is a cover over the opening of this water tank 1, and 4 is an upper entrance of the dehydration tank 2. It is a housing having a donut-shaped space 5 disposed in the part,
Approximately 1/2 of the donut-shaped space 5 is located in this housing 4.
It contains a fluid corresponding to its volume.

Reference numeral 6 denotes a substrate placed at the bottom of the aquarium 1, on which a case 7, a motor 8, etc. are attached, and is supported by a vibration-proof support 9.

10 is an outer frame, and the panel 1 is arranged at the upper end.

Next, the above-mentioned housing 4 will be explained based on FIG. A plurality of floating cutting plates 13 are enclosed that can freely move within the donut-shaped space 5 in response to the function of the cutting plate 13.

The specific gravity of this partition plate 13 is equal to or greater than that of the fluid 12. The floating partition plate 13 has a surface 5 along the inner surface of the outer wall 14 of the housing 4, a surface 17 along the bottom surface 16, and a substantially U-shaped notch 18 that stands vertically within the donut-shaped space 5. Furthermore, the floating partition plate 13 is adapted to the flow of fluid. Next, we will explain the automatic bounce function that has such a floating partition plate 13 and the housing 4 that encloses the fluid 11. First, when dehydration is not being performed,
The fluid within the housing 4 is approximately uniformly distributed, and the floating partition plates 13 may be continuous within the housing 4 or may be separated as shown in FIG.

When laundry is placed in the dehydration tank 2 and a dehydration operation is performed, the fluid in the housing 4 and the floating partition plate 13 move as follows.

First, when the laundry 20 is placed evenly in the spin-drying tank 2, and the weight 0 of the laundry 20 is located almost at the center of the spin-drying tank 2 (the laundry 20
The centrifugal force Fa of the laundry 20 is almost uniformly distributed. Furthermore, the centrifugal force Fb of the fluid within the housing 4 is also uniformly distributed. At this time, the floating partition plate 13 maintains the position when the rotation speed of the dehydration tank 2 becomes steady;
Especially when both Fa and Fb are uniformly distributed, it does not settle. This applies even if the rotational speed is below or above the resonance speed. At the start of dehydration, the rotation of the housing 4 causes the fluid in the housing 4 and the floating partition plate 13 to come off, but Fa is evenly distributed and the weight of the laundry 20 is very close to the center of the dehydration tank. If there is, the fluid will deviate all over the place, and deviations such as being concentrated in one area are unlikely to occur.

However, as shown in FIG. 1, when the laundry 20 becomes greatly unbalanced, the fluid in the housing 4 tends to concentrate in one area.

At this time, the floating partition plate 13 also tends to concentrate in one place as shown in FIG. However, this floating partition plate 13
As shown in the figure, the fluid tends to connect with the surface 19 of the floating partition plate 13 while being resisted by the notch 18 and the inner space of the housing 4 and the surface 19 standing vertically within this space. Since it can only move through the gap, the concentration of the fluid in one area is slightly delayed, and as a result, it is possible to increase the rotation speed of the dehydration tank above the resonance speed while suppressing the increase in whirling, vibration, etc. mentioned above. can. Also, at this time, the weight of the fluid decreases by the volume displaced by the floating partition plate 13, but this is not a problem because the specific gravity of the floating partition plate 13 is equal to or greater than that of the fluid. For this reason, as shown in characteristic A in Figure 2, the switching vibration becomes slightly smaller as indicated by a', and the fluid delays the outward swing of the vibrating body, reducing the vibration at startup. can.

Note that b'' is 0 similarly to b''. Effects of the Invention As described above, according to the present invention, when starting dehydration, the floating partition plate can delay the concentration of fluid in one part within the housing, reducing the vibration of the vibration system and improving start-up performance. Furthermore, the structure is simple, and great effects can be obtained at low cost.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal cross-sectional view of a far-zero dehydrator according to an embodiment of the present invention, Fig. 2 is a diagram showing the relationship between the unbalanced amount of laundry and the vibration angle, and Fig. 3 shows its housing part. ,A
1 is a perspective view of the floating partition plate, B is a perspective view with main parts cut away showing the partition plate accommodated in the housing, FIGS. 4 and 5
The figure is a horizontal sectional view showing the action of the floating partition plate and fluid in the same housing. 2...Dehydration tank, 4...Housing, 5
...Doughnut-shaped space, 12...Fluid,
13... floating partition plate, 18... notch part,
20... Laundry. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. A housing having a donut-shaped space is formed around a rotatable dehydration tank, and within this housing, a fluid and a plurality of floating partition plates that move due to the movement of this fluid are housed, and A balance device for a centrifugal dehydrator, in which a fluid flow section is set between the floating partition plate and the housing. 2. The balance device for a centrifugal dehydrator according to claim 1, wherein the specific gravity of the floating partition plate is equal to or greater than that of the fluid.