JPS58137638A - Balancer for use in centrifugal rotary machine - Google Patents

Abstract

PURPOSE:To protect buffer plates against damages and to prevent generation of noises, by employing such an arrangement that the buffer plates formed on the surface of the outer side wall of an annular chamber integrally with the side wall can cause elastic deformation when spherical members come into abutment with the same. CONSTITUTION:A balancer 8 is formed concentrically with a rotary tank 4, and a plurality of first buffer plates 18 are formed on the surface of the outer side wall 16 of an annular chamber 10 formed in the balancer 8 in the manner that they are unitary with the side wall 16 and disposed intermittently along the circumference of the side wall 16. Similarly, a plurality of second buffer plates 22 are formed on the surfaces of the bottom wall 15 and the inner side wall 17 of the annular chamber 10, in the manner that they are unitary with the bottom wall 15 and the inner side wall 17 and disposed intermittently along the circumference of the chamber 10. The bottom wall 15 and the inner and outer side walls 16, 17 are made of a plastics material, and the first and the second buffer plates 18, 22 are made of the same material. Therefore, when the rotary tank 4 is stopped abruptly, spherical members 13 in the annular chamber 10 are moved along the surface of the outer side wall 16 by their own inertia and come into collision with the first buffer plates 18. However, the shock can be moderated through elastic deformation of the buffer plates 18.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field 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.

[Technical background of the invention and its subject matter]

BACKGROUND OF THE INVENTION Conventionally, for example, in a washing machine with a combination of spin-drying and washing machines, a liquid balancer or a pole balancer is provided in a rotating tub in order to prevent abnormal vibrations of the rotating tub due to unbalanced distribution of laundry during spin-drying. A liquid balancer uses a liquid as a weight, and a pole balancer uses a steel ball, that is, a sphere, as a weight. The liquid balancer is configured to fill an annular chamber in which a plurality of resistance plates integrally protruded from a bottom wall are intermittently provided in the circumferential direction so as to leave a flow path for the liquid, so that the annular chamber is not completely filled. When the rotation speed of the rotating tank is below the resonance rotation speed, the flow of liquid is suppressed by a resistance plate, and when the rotation speed of the rotation tank exceeds the resonance rotation speed, the liquid moves to the unevenly distributed position of the laundry, that is, the unbalanced load position. moves in the opposite direction to absorb the imbalance. In addition, the pole balancer has a configuration in which multiple spheres are housed in an annular chamber so that they can be moved freely.When the rotating tank is rotated to near the resonance rotation speed, the spheres move in the opposite direction to the unbalanced load position. Absorb imbalance.

Therefore, recently, it has been considered to combine the advantages of a liquid balancer and a pole balancer by sealing both a liquid and a sphere in an annular chamber having a resistance plate to create a balancer with a large single-layer unbalance absorption effect. However, with such a configuration, if the opening/closing lid provided at the upper part of the rotating tank is opened while the rotating tank is rotating, and the brake device applies a braking force to the rotating tank, The rotating tank is suddenly stopped, but the sphere inside the annular chamber continues to move due to inertia and violently collides with the relatively rigid resistance plate, which still generates a loud collision sound even though it is filled with liquid. Not only that, but there is a risk that the resistor plate may be damaged.

(Object of the Invention) The present invention has been made in view of the above circumstances, and its purpose is to suppress the generation of collision noise as much as possible even when a sphere collides with a resistance plate for liquid, and to To provide a balancer for a centrifugal rotating machine that can also prevent damage to plates.

(Summary of the Invention) The present invention provides a plurality of first tubes having a flow path through which the liquid and the spheres pass in the upper part of the outer peripheral side wall of the annular chamber, and having a lower end spaced from the bottom wall of the annular chamber. Resistance plates are integrally molded so as to be positioned intermittently in the circumferential direction, and a plurality of second resistance plates are integrally molded to be positioned in the vicinity of the first resistance plate on the inner peripheral side wall of the annular chamber. This is intended to buffer the impact of the sphere when it collides with the first resistance plate.

[Embodiments of the invention]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a dehydrating and washing machine will be described below with reference to the drawings. In Figure 1, 1 is the outer box,
2 is a tab elastically supported within the outer box 1 via a hanging rod mechanism 3; 4 is a plastic rotatably provided within the tub 2, having numerous dehydration holes 4a on the peripheral wall and a stirring chamber 5 on the inner bottom. The rotating tank 6 is connected to the rotating tank 4 via the power transmission mechanism 7.
and a washing machine motor that selectively transmits rotational force to the stirring blades 5; 8 is a balancer disposed concentrically with the rotating tub 4;

Next, this balancer 8 will be explained in detail. 9 is an annular case made of plastic such as polypropylene with an open top and an annular chamber 10 inside, and a flange 1 integrally molded on the outer periphery.
1, and the flange 11 is connected to a through hole 11a formed therein.
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 using a screw. The upper opening of this annular case 9 is connected to the same annular chamber 10.
After accommodating a low viscosity liquid (for example, saline solution) 12 for the balancer and a plurality of spheres 13 made of steel or coated with rubber for the balancer, the lid member 14 is made of plastic such as polypropylene. blocked by. In such an annular chamber 10, the outer peripheral side located on both sides of the bottom wall 15! 16 and the lower end portions of the inner circumferential side 8117 are inclined portions 16a that are inclined so as to widen from each other as they move upward.
and 17a, and the inner surface of the portion of the outer circumferential side wall 16 above the inclined portion 16a is formed into an inclined surface 16b that rises so as to be inclined outward. In the above case, the liquid 12 is contained in the annular chamber 10.
It is sealed in an amount that reaches approximately half the height of 0. 18 is the outer peripheral side l! of the annular chamber 10. 16, a plurality of first
These resistance plates protrude into the annular chamber 10, a flow path 19 is formed between the upper end surface and the inner surface of the lid member 14, and a predetermined interval 20 is formed between the lower end surface and the inner surface of the bottom 115. is formed, and a gap 21 is formed between the end surface of the tip and the inner surface of the inner peripheral side 117. Reference numeral 22 designates a plurality of second resistance plates that are integrally molded so as to be located intermittently in the circumferential direction on the bottom wall 15 and the inner circumferential side 4117 of the annular chamber 10, which protrude into the annular chamber 10 and Said 8 first resistance plate 1
It is located on the opposite side to the rotational direction 23 of the rotating tank 4 near 8, and the end face of the tip and the outer peripheral side wall 16
There is a gap 24 larger than the diameter of the sphere 13 between the inner surface of the sphere 13 and the inner surface of the sphere 13.
is formed. The tip of the second resistance plate 22 is formed in an inclined shape so that the width becomes wider as it goes downward. The tip of the lower half part is partially bent in the circumferential direction. In addition, 25 is an opening/closing amount provided at the upper part of the rotary tub 4, and when this is opened, a lid switch (not shown) is opened and the energizing path of the washing machine motor 6 is cut off during spin-driving operation, and a brake (not shown) is opened. The device operates to apply a braking force to the single rotation tank 4.

Next, the operation of this embodiment will be explained. When the rotary tank 4 is driven once to start the dewatering operation, the sphere 13 and the liquid 12 are not subjected to such a large centrifugal force during the low-speed co-rotation period below the resonance rotation number, so that the first rotation of the sphere 13 The free circumferential movement of the resistive plates 18 beyond the mutual spacing is inhibited by the first resistive plate 18, and the liquid 12 is prevented from flowing by the first resistive plate 18 as shown by the arrow 26 in FIG. Then, the flow is suppressed by the second resistance plate 22, and the movement in the local direction receives considerable resistance. Therefore, it is possible to prevent the inconvenience that the sphere 13 and the liquid 12 gather in one direction at an unbalanced load level below the resonance rotation number and increase the unbalanced amount. Now, when the rotating tank 4 reaches the resonance number of revolutions or higher, the sphere 13 and the liquid 12 have been sufficiently accelerated to rotate almost integrally with the rotating tank 4 due to the presence of the resistance plates 18 and 22. First, the sphere 13 climbs up the slope 168 and the slope 16b due to centrifugal force and is located near the top end 16C. At this position, the upward force on the sphere 13 disappears, so the sphere 1
3 does not always come into contact with the lid member 14 as if pressing it upward, and no unnecessary external force is applied to the lid member 14. In this way, the sphere 13 is located in the flow path 19 in which its circumferential movement over its entire circumference is unimpeded, while its body 12 is also moved into the annular chamber 19 by centrifugal force.
It gathers on the inner and outer sides and becomes movable in the circumferential direction via the flow path 19. As a result, if an unbalanced load exists in the rotating tank 4, the spheres 13 and the liquid 12 gather on the opposite side from the unbalanced load position. In this case, if the amount of unbalance is below the unbalance absorption limit point by the spheres 13, the spheres 13 will approach each other until the vibration amplitude becomes zero, and therefore the amplitude will become zero, so the movement of the liquid 12 in the circumferential direction does not occur, and the pole balancer effect mainly appears. On the other hand, when the unbalanced load exceeds the unbalance absorption limit point by the spheres 13, all the spheres 13 are already completely gathered together at this eye boundary point, so the vibration system is in an unbalanced state. This time, the liquid 12 moves in a direction that absorbs the imbalance, producing a liquid balancer effect. In fact, when the rotary drive of the zero rotation tank 4 is stopped to stop the dehydration operation, the rotation tank 4 rotates slightly due to open inertia and then stops. As it returns to the inner lower part, the flow in the circumferential direction is blocked by the resistance plate 18°22.

By the way, during the dehydration operation as described above, the opening/closing lid 2
5 is opened, the energizing path of the washing machine motor 6 is cut off by opening a cover switch (not shown), and a braking force is applied to the rotating tub 4 by operating a brake device (not shown). Therefore, the rotation of the rotating tank 4 in the direction of the arrow 23 comes to be abruptly stopped, but the sphere 13 in the annular chamber 10 moves to the outer peripheral side 1 due to inertia as shown in FIG. !
16 in the circumferential direction, and the first resistance plate 18
will start colliding with each other. However, the first resistance plate 18 is on the outer peripheral side! ! 16 and each lid member 14. A flow path 19. Since the first resistance plate 18 is provided by integral molding of plastic so as to form the openings 20 and 21, respectively, the first resistance plate 18 is in a cantilevered state at the base end and can be elastically deformed. When the spheres 13 collide, the resistance plates 18 of the 11 are elastically deformed as shown by the two-dot chain line in FIG. 4 to buffer the impact.

According to this embodiment, even if the sphere 13 collides with the first resistance plate 18 when the rotating tank 4 suddenly stops, the first resistance plate 18 is elastically deformed to buffer the impact. So,
Coupled with the fact that it is in a liquid, the generation of collision noise can be suppressed to an extremely low level, and damage to the first resistance plate 18 can also be prevented.

In the above embodiment, the sphere 13 is made of steel, but it may be made of glass or the like instead.

In addition, the present invention is not limited to the embodiments described above and shown in the drawings, and can be used as a balancer not only for dehydrating and washing machines but also for centrifugal rotating machines in general, etc., as appropriate without departing from the scope of the invention. Of course, modifications can be made.

〔Effect of the invention〕

As explained above, when a sphere collides with the first resistance plate integrally formed on the outer peripheral side wall of the annular chamber, the first resistance plate elastically deforms to buffer the impact. It is possible to suppress the generation of sound as much as possible, and the
Therefore, it is possible to provide a balancer for centrifugal rotation that effectively exhibits the effects of a liquid balancer and a ball balancer.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a dehydrating/washing machine, in which Fig. 1 is an overall longitudinal sectional side view, Fig. 2 is a longitudinal sectional view of main parts, and Figs. 3 and 4 are respectively for illustration. FIG. 3 is a partially cutaway plan view of the main part in the operating state. In the drawings, 4 is a rotating tank, 8 is a balancer, 9 G is an annular case, 10 is an annular chamber, 12 is a liquid, 13 is a sphere, 14 is a lid member, 16 is an outer peripheral side wall, 17 is an inner peripheral side wall, and 18 is a 1st
19 is a flow path, 20 and 21 are intervals, and 22 is a second resistance plate. Applicant Tokyo Shibaura Electric Co., Ltd. Figure 1 Figure 212 Figure 3 Figure 4

Claims (1)

[Claims] 1. An annular chamber arranged substantially concentrically with the rotating tank, a liquid sealed in the annular chamber in an amount that does not completely fill the annular chamber, and a plurality of spheres sealed in the annular chamber. and an inwardly facing wall is integrally molded so as to be located intermittently in the circumferential direction on the outer circumferential side wall of the annular chamber, and has a flow path in the upper part through which the liquid and the sphere pass, and a lower end and the bottom of the annular chamber. a plurality of first resistance plates having a 1Ill positive side between them and a wall; and a plurality of second resistance plates integrally molded on the inner circumferential side wall of the annular chamber and located near the first resistance plate. A balancer for a centrifugal rotating machine comprising a resistance plate.