JPS5837353A - Balancer for centrifugal rotator - Google Patents

Abstract

PURPOSE:To secure an imbalanced absorption action effective for the wide variation in imbalance amounts by providing an annular chamber with a liquid and a sphere being contained in sealed manner as an imbalance absorptive medium in a rotary tank. CONSTITUTION:When imbalance amounts are within the limiting point of imbalance absorption by a sphere 12, the sphere 12 exhibits its excellent ball balancing effect to effectively reduce the vibration of a rotary tank 4. Also, when the imbalance amounts exceed the limiting point of imbalance absorption, which is the limit of the ball balancing effect, a liquid W as a balancing weight is applied to the sphere 12, whereby suppressing the lowering of imbalance absorptive capability. In this way, the balancer 8 exhibits its effective imbalance absorption action for the wide variation in imbalance amounts.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a balancer for a centrifugal rotating machine in which a rotating tank is provided with an annular chamber containing a liquid and a sphere as an unbalance absorbing medium.

Conventionally, for example, in the dehydrating and washing machine II, a balancer is provided in the rotating tub in order to prevent the rotating tub from vibrating abnormally due to unbalanced distribution of laundry during spin-drying. There are three types of balancers: solid balancers, liquid balancers, and pole balancers. Among these, solid balancers are designed to increase the moment of inertia of the rotating system by attaching a ring-shaped weight around the rotating tank to relatively reduce the vibration forcing force. On the other hand, a liquid balancer uses an adult body as a weight, and a pole balancer uses a steel ball or ball as a weight. The liquid balancer consists of an annular case in which liquid is sealed in a freely flowing manner and attached to a rotating tank.When the rotating tank reaches a resonance speed or higher, the liquid moves in the opposite direction to the unevenly distributed position of the laundry, that is, the unbalanced load position. The unbalance is corrected and vibration and noise are automatically reduced. Similarly, in a pole balancer, spheres move as in the case of the liquid described above to reduce vibrations. Theoretically, the pole balancer has the greatest unbalance absorption effect, followed by the liquid balancer and the third by the solid balancer.

The pole balancer exhibits a good characteristic in which the spheres gather together until the vibration amplitude becomes zero, but from now on, the unbalance absorption capacity is maximized when all the spheres are gathered together so that they are in contact with each other. There is no ability to reduce the vibration amplitude to zero for an unbalance amount of , and this is said to be the unbalance absorption limit point. On the other hand, in a liquid balancer, vibration 4
There is no function to reduce the width of the bow to zero, and there is a problem called rhythmic vibration in liquid balancers. When the rotating tank is in steady rotation, if a slight rotational unevenness occurs due to the drive device, etc., this will give a circumferential force to the liquid, causing the liquid to rotate in the circumferential direction of the annular chamber. A wave is generated as a standing wave, and the unbalanced weight due to the standing wave repeatedly matches the position of the unbalanced load, causing vibration in the rotating tank. The generation of this standing wave can be suppressed by installing a shielding plate in the annular chamber, and the suppression effect improves as the liquid flow resistance by the shielding plate increases. Therefore, it takes time for the liquid to move to the side opposite to the unbalance load position, and the rise time of the unbalance absorption effect becomes longer.

The present invention has been made in order to eliminate the various drawbacks of the pole balancer and liquid balancer as described above, and its purpose is, firstly, that the excellent six-ball buffing effect of the spheres can be expected below the unbalance absorption limit point. In addition, in the region exceeding the unbalance absorption limit point, the liquid balancer effect is exhibited, and an effective unbalance absorption effect can be ensured over a wide range of changes in the amount of unbalance. It is an object of the present invention to provide a balancer for a centrifugal rotating machine that can meet the conflicting demands of suppressing rhythmic vibrations and quickly increasing the unbalance absorption effect.

An embodiment in which the present invention is applied to a dewatering and swamp washing machine will be described below. In Figure 1, 1 is the outer box, 2 is the outer FiI
A tub 4, which is elastically supported through a hanging rod gutter groove 3, is rotatably provided within the tub 2, and has a large number of dewatering holes 4a on the peripheral wall, and a plastic rotating tank 6, which has an agitation g5 on the inner bottom. 8 is a washing machine motor that selectively transmits rotational force to the rotating tub 4 and stirring blades 5 via a power transmission mechanism 7, and 8 is a balancer according to the present invention arranged concentrically with the rotating tub 4. The balancer 8 will be explained in detail. Reference numeral 9 denotes a plastic annular case with an open top surface and an annular chamber 10 inside, and has a flange 11 integrally molded on the outer periphery. It is installed in the upper end opening of the rotating tank 4 by screwing it to the upper end of the rotating tank 4. And this annular case 9
The upper opening is closed by a lid member 15 after accommodating a low viscosity liquid (for example, saline solution) W for a balancer and a plurality of steel spheres 12 for a balancer in the same annular chamber 10. Ru. On the inner surface of the outer peripheral wall of such annular chamber 1o, an inclined surface 101L that rises outwardly is formed, and on the other hand, a plurality of resistance plates 14 are arranged circularly as liquid movement inhibiting protrusions in the annular chamber 10. They are provided by integral molding so as to face each other at equal intervals in the circumferential direction. And this resistance plate 14
A medium passage port 14a is formed through which the sphere 12 and the liquid W pass through by cutting out one corner of the outer upper part of the hole, and the other sides are liquid-tightly connected to the inner surface of the annular chamber 10 including the inner surface of the lid member 13. are doing. In particular, the medium passage port 14& has a rectangular shape that is slightly thicker than the rectangular hole circumscribing the sphere 12, and the medium passage port 1
The area on the circumferential surface of the region 9 at the same height as that of the medium flow path 10b is defined as the medium flow path 10b. Further, as shown in FIG. 5, the spacing L1 between the resistive plates 14 is set to be equal to or less than the length L2 of the nine spheres 12 arranged in a line in contact with each other.

Next, the operation of the above configuration will be explained. First, when the rotating tub 4 is started by the washing machine motor 6 for dewatering operation,
The liquid W and the sphere 12 begin to rotate following the rotation of the rotating tank 4 by the resistance plate 14.

As the rotation of the rotating tank 4 increases, the liquid W gathers toward the outside and upper side of the annular chamber 10 due to the U force.

When the rotational speed further increases, the sphere 12 climbs up the slope 10& due to centrifugal force and is positioned in the medium flow path 10b. At this time, if there is an unbalanced load 15 (see Figure 1) in which laundry or dehydrated materials are unevenly distributed in the rotating tub 4, the spheres 12 approach each other in the direction opposite to the position of the unbalanced load 15. As such, it rolls and moves on the medium flow path 10b, absorbs the imbalance, and stops moving at the position where the vibration amplitude of the rotating tank 4 becomes substantially zero.

The distribution of the spheres 12 in this state is shown as an example in FIG.
are completely gathered together as shown in Figure 5, as if they are in contact with each other. In other words, in the unbalance absorption action by the spheres 12, when the unbalance amount is within the absorption limit point, the distribution of spheres is spaced apart from each other as shown in Figure 4, and above the absorption limit point, the distribution of spheres is as shown in Figure 5. It becomes a spherical distribution that is completely clustered together. On the other hand, regarding the behavior of the liquid W, when the amount of unbalance is within the absorption limit point by the sphere 12, the vibration amplitude of the rotating tank 4 is approximately zero due to the pole balancer effect, so the deviation movement of the liquid W does not occur. Instead, as shown in FIG. 4, a uniform liquid layer thickness is distributed over the entire outer circumference of the annular chamber 10. On the other hand, if the unbalance amount is above the absorption limit point due to the pole balancer effect, the rotating tank 4 is moving by an unbalanced amount, so the liquid W is at the unbalanced load 15 position as shown in FIG. The medium flow path 101 is in the opposite direction, that is, in the direction of the completely gathered spheres 12.
The liquid flows along the direction, and the liquid layer thickness is maximum at this part.

According to the balancer 8 of this embodiment that operates as described above, the following effects can be expected. Unbalance amount is 1 sphere
When it is within the unbalance absorption limit point according to 2, the sphere 12 exhibits an excellent ball balancer effect to effectively reduce the vibration of the rotating tank 4, and the unbalance absorption limit point, which is the limit of the pole balancer effect, is reached. For the above unbalance amount, the liquid W is added to the sphere 12 as a balancer weight to suppress a decrease in the unbalance absorbing ability. In this way, the balancer 8 exhibits an effective unbalance absorbing effect against changes in the amount of air over a wide range of angles.

On the other hand, considering the case where a force in the circumferential direction is applied to the liquid W due to uneven rotation due to some cause during steady rotation of the rotating tank 4, the amount of unbalance is within the unbalance absorption limit point. Due to the pole balancer effect of the sphere 12, the liquid W flows into the medium flow path 101 as shown in FIG.
) Liquid fillers 4 approximately equivalent to the spheres 12 distributed around the entire circumference
Since the liquid W is uniformly distributed with a uniform thickness, even if a circumferential force is applied to the liquid W, its flow is strongly restricted by the sphere 12, and it is prevented from forming a standing wave as in the conventional case. Further, when the unbalance k is above the unbalance absorption limit point, the spheres 12 are completely gathered together as shown in FIG. Therefore, 12 rows of spheres are located within the medium passage port 14a formed in the resistance plate 14, and if the change is made, both the resistance plate 14 and the spheres 12 are located in the medium flow path 10.
It is located perpendicular to b. As a result, as shown in FIG. 5, although the liquid W is gathered in a liquid layer with a thickness tliK greater than or equal to the W diameter of the sphere 12, there is a slight difference between the sphere 12 and the liquid W with respect to its circumferential fluidity. The adjacent resistance plate 14 acts as a flow resistance through a gap (shown with an arrow 16), so even if a circumferential force is applied to the liquid W due to uneven rotation, it will not become a standing wave. Rhythmic vibration of the rotary tank 4 caused by the buffing agent liquid WK can be prevented as much as 0 or more. Since the flow resistance given to the liquid W in order to prevent rhythmic vibrations is generated in the rotating state of the rotary tank 4 in which the sphere 12 is located in the medium flow path 101)K, the flow resistance applied to the liquid W to prevent rhythmic vibration is generated immediately after the rotation tank 4 is started. When cutting the common handling point east, the medium can easily flow through the medium flow path 10b in the opposite direction to the unbalanced load position without receiving almost any resistance from the liquid wH sphere 12, and therefore, a rapid rise in the unbalance absorption effect can be expected. .

As described above, the present invention encloses a liquid and a sphere in an annular chamber concentric with the rotating tank, and also provides a plurality of liquid movement inhibiting protrusions within the annular chamber so as to leave a medium flow path at the upper outside of the annular chamber. The structure is characterized in that the liquid movement inhibiting protrusions are arranged so as to face each other in the circumferential direction, and the spacing between the liquid movement inhibiting protrusions is determined to be equal to or less than the length of one row of the spheres. The pole balancer effect is exerted for the amount of unbalance within the unbalance absorption limit point, and the amount of unbalance beyond this is absorbed by the liquid balancer effect, making it effective against a wide range of changes in the amount of unbalance. It is possible to provide a balancer for a centrifugal rotating machine which can obtain an unbalance absorbing action, and secondly can suppress rhythmic vibration of the rotating tank due to the balancer liquid and quickly start up the unbalance absorbing action.

[Brief explanation of drawings]

The drawings show a nine-embodiment in which the present invention is applied to a dehydrating and washing machine, in which Fig. 1 is a schematic longitudinal side view of the dehydrating and washing machine, Fig. 2 is an enlarged longitudinal sectional view of the balancer portion, and Fig. This figure is a partial cross-sectional plan view of the same balancer, and FIGS. 4 and 5 are cross-sectional plan views of the balancer shown in different operating states. In the figure, 4 is a rotating tank, 9 is an annular case, 1o is an annular chamber, 1
2 is a sphere, and 14 is a resistance plate (I & dynamic pressure stop protrusion 10t) and a medium flow path. Applicant: Tokyo Shibaura Electric Co., Ltd.

Claims (1)

[Claims] 1. A low viscosity liquid and a plurality of spheres are enclosed in a circular chamber arranged substantially concentrically with the rotating tank, and the liquid is not completely filled with the liquid, and a plurality of spheres are enclosed in the circular chamber. A balancer for a centrifugal rotating machine, comprising a plurality of liquid movement restrainers, leaving a medium flow path through which the liquid and the spheres pass on the outer upper part.