CN109778493B - A washing machine balancing device and washing machine - Google Patents

Abstract

The invention discloses a washing machine balancing device and a washing machine, wherein the washing machine balancing device comprises a hollow annular shell coaxially arranged on a rotary barrel of the washing machine, a balancing ball movably arranged in the hollow annular shell, and a damping part which enables the moving balancing ball to generate magnetic damping. The washing machine balancing device utilizes magnetic damping to block the motion of the balance balls, so that the instability phenomenon caused by collision of the balance balls is avoided; and the structure is simple, the forming is convenient, and the economy is good.

Description

A washing machine balancing device and washing machine

technical field

The invention relates to the field of washing machines, in particular to a balancing device for washing machines and a washing machine provided with the balancing device.

Background technique

In order to solve the problem of dehydration vibration noise in current washing machines, a liquid balance ring is usually used to offset the eccentricity of the clothes. However, the liquid balance ring has shortcomings such as low anti-bias ability, unstable interval, and problems such as liquid leakage and large filling rate error due to processing technology. In the past, the retest gimbal used a passive gimbal system in the form of a combination of steel balls and liquids. In order to avoid the transient excitation of the steel balls during dehydration startup, the steel ball cavity was filled with silicone oil with a certain viscosity to ensure that the steel balls were started instantly. The ball speed is similar to the inner barrel speed. However, this balance ring has the problem of leakage of silicone oil, and once the liquid leaks, it will cause secondary pollution to the clothes.

In the existing washing machine technology, in order to solve the problem of dehydration vibration and noise, the washing machine usually adopts a liquid balance ring to offset the eccentricity problem generated when the inner tub rotates. However, the liquid balance ring has shortcomings such as poor eccentricity resistance, unstable interval, and problems such as liquid leakage and large filling rate error due to processing technology.

The Chinese Patent Application No. 201120185597.3 discloses a ball balancing device for a washing machine, which includes an inner hollow annular casing, which is coaxially fixed on the rotating tub of the washing machine; a plurality of balancing balls are arranged inside the annular casing and are It moves along the circumferential direction inside the annular housing, and is characterized in that: between two adjacent balance balls, there is a spacer ball spaced between the two balance balls. The utility model discloses a ball balancing device for a washing machine, which utilizes the balancing liquid filled in the annular casing and the isolation ball to block the direct collision of the balancing balls during startup and high-speed rotation, eliminates the noise caused by the collision of the balancing balls, and reduces the noise. The impact on the user, but because the balance ring is equipped with a balance liquid, there is a problem of leakage of the balance liquid, and once the leakage will cause pollution to the clothes, without the balance liquid, the isolation ball cannot be used to achieve the purpose, and the isolation ball and the There are also collisions between the balance balls.

The Chinese Patent Application No. 201410742320.4 discloses a washing machine and a ball balance ring for the washing machine, which includes a rotatable tub driven by a motor, an annular channel is provided along the circumference of the tub, and a plurality of spheres that can be rolled along the channel are installed in the channel , the plurality of spheres include magnetic balls and non-magnetic balls that can be attracted by magnetic force. Due to the attraction of the magnetic balls, multiple spheres will be attracted together to form a mass body, the spheres of this mass body will not collide with each other, or only a few edge spheres will collide when the rotating motion of the barrel is unstable , although this solution reduces the noise generated by the collision of the spheres, but because the balance balls are sucked together to form a mass body, the movement of the mass body is restricted, and the balance effect will be greatly reduced.

The present invention has been made in view of this.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a balancing device for a washing machine and a washing machine provided with the balancing device.

In order to solve the above technical problems, the basic concept of the technical solution adopted in the present invention is: a balancing device for a washing machine, comprising a hollow annular casing coaxially arranged on the drum of the washing machine, and a movable balance ball arranged in the hollow annular casing , and also includes a damping part that makes the moving balance ball generate magnetic damping.

Further, the damping part includes a magnet, and the magnet is arranged on the outer side of at least one surface of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular casing;

Alternatively, the magnets are arranged on at least one of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular casing.

Further, the magnet of the damping part is a ring magnet, and the ring magnet is coaxially arranged with the hollow annular casing.

Further, the balance ball is made of non-magnetic metal, preferably, the balance ball is a stainless steel ball.

Further, the balancing device of the washing machine further includes a plurality of spacers that move together with the balance balls, and the spacers space between two adjacent balance balls.

Further, the balancing device of the washing machine is arranged at the bottom of the rotating tub of the washing machine.

Further, the hollow annular casing of the washing machine balancing device includes a first casing and a second casing, the first casing includes a chamber for accommodating the movement of the balance ball, and the second casing is connected to the first casing. The body cooperates to close the chamber. Preferably, the first shell is integrally formed at the bottom of the washing machine drum, and a flange is installed on the bottom of the washing machine drum, and the flange forms the second shell.

Further, the damping portion is disposed outside the inner annular surface of the hollow annular casing to form an inner magnetic ring, and/or the damping portion is disposed outside the outer annular surface of the hollow annular casing to form an outer magnetic ring.

Further, the bottom of the washing machine drum is provided with a connecting portion connected with the flange, and the inner magnetic ring and/or the outer magnetic ring is divided into magnetic ring segments uniformly arranged in the circumferential direction by the connecting portion.

The present invention also provides a washing machine, which includes the self-adjusting balance ring described above.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

1. The balancing device of the washing machine is provided with a damping part, and the damping part generates a magnetic field on the movement track of the balancing ball. During the rotating motion of the balancing ball in the hollow annular shell, the magnetic field lines are continuously cut to generate magnetic damping, which hinders the balance. Ball movement, avoid the instability phenomenon caused by the collision in the process of starting the acceleration, and the instability phenomenon caused by the collision in the process of reversing or decelerating, and can generate magnetic damping during the movement process, hinder the movement of the balance ball, and make the balance device Always maintain an efficient balance.

2. Eliminate the noise caused by the collision of the balance ball, improve the quality of the product and prolong the service life.

3. Through the non-contact damping material of magnetic damping, the cost can be reduced, the processing technology is simple, the reproducibility is strong, and the risk is low.

4. The damping part is set to generate magnetic damping to hinder the movement of the balance ball, so as to avoid the contamination of clothes caused by the leakage of liquid from the balance device that uses liquid to generate damping.

5. Set up spacers to prevent adjacent balance balls from colliding with each other.

6. Simple structure, convenient molding, high reliability, good usability and good economy.

The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide further understanding of the present invention, and the exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, other drawings can also be obtained from these drawings without any creative effort. In the attached image:

Fig. 1 is the schematic diagram of the balancing device of the present invention;

Fig. 2 is the schematic diagram of damping part of the present invention;

Fig. 3 is the bottom schematic diagram of rotating barrel of the present invention;

Fig. 4 is the schematic diagram of the washing machine of the present invention;

Fig. 5 is the mechanical analysis diagram of washing machine of the present invention;

Fig. 6 is the analysis model of the damping force of the balance ball of the present invention.

In the figure: 1. Rotating barrel; 11. Bottom of rotating barrel; 12. Flange; 2. Balance device; 21. Hollow annular shell; 22. Balance ball; 23. Damping part; 231. Inner magnetic ring; Magnetic ring; 3. Upper liquid balance ring; 4. Outer barrel; 5. Clothing eccentricity; 6. Motor.

It should be noted that these drawings and written descriptions are not intended to limit the scope of the present invention in any way, but to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention , but are not intended to limit the scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "upper", "lower", "inner", "outer", etc. are based on the orientations or positional relationships shown in the accompanying drawings, only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated connection. Ground connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The specific embodiments of the present invention will be further introduced below with reference to the accompanying drawings.

Example 1

As shown in FIG. 1-FIG. 5, a washing machine balancing device 2 includes a hollow annular casing 21 coaxially arranged on the washing machine drum 1, and a movable balancing ball 22 arranged in the hollow annular casing 21, It also includes a damping portion 23 for magnetically damping the moving balance ball 22 .

In the above solution, the washing machine balancing device 2 is suitable for both drum washing machines and pulsator washing machines. Taking a pulsator washing machine as an example, in general, a balancing device 2 is provided at the upper end of the inner tub of the pulsating washing machine. The balancing device 2 in this embodiment is preferably arranged at the bottom of the inner tub of the pulsating washing machine. The hollow annular casing 21 forms a slideway for the balance ball 22 , and each inner surface of the hollow annular casing 21 is smooth. The damping part 23 generates a magnetic field on the movement track of the balance ball 22. During the rotational movement of the balance ball 22 in the hollow annular casing 21, the magnetic field lines are continuously cut to generate magnetic damping, which hinders the movement of the balance ball 22 and avoids starting. The instability phenomenon caused by the collision during the acceleration process, and the instability phenomenon caused by the collision during the reversal or deceleration process, and can generate magnetic damping during the movement process, hinder the movement of the balance ball 22, and keep the balance device 2 always efficient. balancing effect. The damping portion 23 may be a magnetic field generated by a magnet, or may be other substances that can generate a magnetic field in the hollow annular casing 21 .

Further, the damping portion 23 includes a magnet, and the magnet is disposed on the outer side of at least one surface of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular casing 21 .

In the above solution, the damping part 23 includes a magnet, which forms a magnetic field for the hollow annular casing 21 , and the balance ball 22 moves in the hollow annular casing 21 to cut the magnetic field lines to generate magnetic damping. The magnets may be disposed on the outside of the upper surface, and/or the outside of the lower surface, and/or the outside of the inner ring surface, and/or the outside of the outer ring surface of the hollow annular casing 21 . Generally, it can be set on one surface to meet the requirements of magnetic field strength. In addition, since installation on the upper surface or the lower surface will increase the difficulty of installation, etc., it is preferably arranged on the inner ring surface and/or the outer ring surface. Also, it is difficult for the magnet to achieve the smoothness for the balance ball 22 to move in the hollow annular casing 21 , or the magnet needs to be additionally processed to achieve the smoothness, and the magnet is directly used as the inner surface of the hollow annular casing 21 . The wear will affect subsequent use, so in this embodiment, the magnets are preferably arranged on the outer sides of each surface of the hollow annular housing 21 .

Further, the magnet of the damping portion 23 is a ring magnet, and the ring magnet is coaxially disposed with the hollow annular housing 21 .

In the above solution, because the balance ball 22 moves in the hollow annular casing 21, the ring-shaped magnet that provides the magnetic field for the hollow annular casing 21 can be a ring-shaped magnet. In this way, a uniform and sufficient magnetic field can be provided for the hollow annular casing 21 , the size of the magnet and the installation space can be saved, and a uniform and sufficient magnetic field can be provided without increasing the volume of the balance device 2 . The ring magnet can be a whole piece of ring magnet, or can be set as a ring magnet formed by several arc magnets according to the needs of installation and the like.

Further, the balance ball 22 is made of non-magnetic conductive metal, and preferably, the balance ball 22 is a stainless steel ball.

In the above solution, the balance ball 22 is made of non-magnetic conductive metal, which will not generate magnetism during the process of cutting the magnetic field line or generate a large movement resistance due to the magnetism, which affects the effect of the balance device 2 . Stainless steel balls are preferred because they are smooth, dense, and a non-magnetic metal.

Embodiment 2

As shown in FIGS. 1-5 , in this embodiment, a balancing device 2 for a washing machine includes a hollow annular casing 21 coaxially arranged on the washing machine drum 1 , and a hollow annular casing 21 movably arranged in the hollow annular casing 21 . The balance ball 22 further includes a damping part 23 that makes the moving balance ball 22 generate magnetic damping.

Compared with the first embodiment, the damping part 23 includes magnets, and the magnets are disposed on at least one of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular housing 21 .

In the above solution, the magnets are arranged on at least one side of the upper surface, the lower surface, the inner annular surface and the outer annular surface to form at least one of these surfaces of the hollow annular shell 21, which is simple and convenient, and does not need to provide additional shell walls. , At the same time, the magnetic field is strong, and the magnetic damping effect is good.

Embodiment 3

As shown in FIGS. 1-5 , in this embodiment, a balancing device 2 for a washing machine includes a hollow annular casing 21 coaxially arranged on the washing machine drum 1 , and a hollow annular casing 21 movably arranged in the hollow annular casing 21 . The balance ball 22 further includes a damping part 23 that makes the moving balance ball 22 generate magnetic damping.

This embodiment is a further limitation of Embodiment 1. In this embodiment, the washing machine balancing device 2 is arranged at the bottom 11 of the rotary drum of the pulsator washing machine, and the bottom 11 of the rotary drum is also the bottom of the inner drum of the pulsator washing machine. , the hollow annular casing 21 can be detachably arranged at the bottom of the inner tub, or can be integrally formed at the bottom of the inner tub of the washing machine.

Further, in this embodiment, the hollow annular casing 21 of the balancing device of the washing machine includes a first casing and a second casing, the first casing includes a chamber that can accommodate the movement of the balance ball 22, and the first casing The second shell cooperates with the first shell to close the chamber. Preferably, the first shell is integrally formed on the bottom 11 of the drum of the washing machine, and the bottom 11 of the drum of the washing machine is installed with a flange 12 , and the flange 12 A second housing is formed.

In the above solution, the first casing and the second casing cooperate to form a closed chamber for the balance ball 22 to move. The bottom 11 of the washing machine drum is integrally formed with a first housing for the balance ball 22 to move. The flange 12 is detachably connected to the bottom 11 of the washing machine drum. The flange 12 is connected to the first shell. The fit forms a closed chamber.

Further, the damping portion 23 is disposed outside the inner annular surface of the hollow annular casing 21 to form an inner magnetic ring 231 , and the damping portion 23 is disposed outside the outer annular surface of the hollow annular casing 21 to form an outer magnetic ring 232 . .

Further, the washing machine drum bottom 11 is provided with a connecting portion connected to the flange 12 , and the inner magnetic ring 231 and the outer magnetic ring 232 are divided into circumferentially evenly arranged magnetic ring segments by the connecting portion.

In the above solution, as shown in FIG. 2 , the inner magnetic ring 231 is composed of 8 arc-shaped magnetic ring segments, and the outer magnetic ring 232 is composed of 2 arc-shaped magnetic ring segments, which are respectively arranged on the bottom 11 of the washing machine drum. In the installation cavity of the inner part, the eight arc-shaped magnetic ring segments form a ring magnet, and the two arc-shaped magnetic ring segments form a ring magnet. The flange 12 is detachably connected to the bottom 11 of the drum of the washing machine through the connecting portion.

The washing machine balancing device 2 of the present invention is not limited to being arranged at the bottom of the inner tub of the pulsator washing machine, but can also be arranged at the upper part of the tub body, or at the front or rear end of the drum of the drum washing machine.

Embodiment 4

In this embodiment, a washing machine balancing device 2 includes a hollow annular casing 21 coaxially disposed on the washing machine drum 1, and a movable balancing ball 22 disposed in the hollow annular casing 21. The balance ball 22 produces magnetic damping of the damping portion 23.

Compared with the third embodiment, the difference is that the damping portion 23 is disposed outside the inner annular surface of the hollow annular housing 21 to form an inner magnetic ring 231 .

Embodiment 5

In this embodiment, a washing machine balancing device 2 includes a hollow annular casing 21 coaxially disposed on the washing machine drum 1, and a movable balancing ball 22 disposed in the hollow annular casing 21. The balance ball 22 produces magnetic damping of the damping portion 23.

Compared with the third embodiment, the difference is that the damping portion 23 is disposed on the outer side of the outer annular surface of the hollow annular housing 21 to form an outer magnetic ring 232 .

Embodiment 6

In this embodiment, a washing machine balancing device 2 includes a hollow annular casing 21 coaxially disposed on the washing machine drum 1, and a movable balancing ball 22 disposed in the hollow annular casing 21. The balance ball 22 produces magnetic damping of the damping portion 23.

As shown in FIG. 5 , this embodiment includes an inner tub and an outer tub 4 of the washing machine, a balancing device 2 is arranged at the bottom of the inner tub, and an upper liquid balancing ring 3 is arranged on the upper part of the inner tub. , the motor 6, the number and diameter of the balance ball 22 are designed as follows:

As shown in Figure 4, assuming that the center point of the whole machine system is O, the mass center point of the whole machine system is e, the mass of the clothes eccentric 5 is m, the mass of the upper liquid balance ring 3 is m ₁ , and the mass of the bottom balance device 2 is m ₂ . When the dehydration rotates at high speed, as shown in Figure 5, the following formulas 1 and 2 are obtained according to the principle of force and torque balance:

F=F _e +F ₂ +F ₁ Formula 1

FL=F _e L _e +F ₂ L ₂ -F ₁ L ₁ Formula 2

in:

F is the centrifugal force generated by the eccentric 5 of the clothes, and L is the vertical distance between the center of mass of the eccentric 5 of the clothes and the center of the whole machine.

F _e is the centrifugal force generated by the center of mass of the whole machine, and L _e is the vertical distance between the center of mass and the center of the whole machine.

F ₁ is the centrifugal force generated by the liquid balance ring at the top of the whole machine, and L ₁ is the vertical distance between the liquid balance ring and the center of the whole machine.

F ₂ is the centrifugal force generated by the bottom balancing device 2, and L ₂ is the vertical distance between the balancing device 2 and the center of the whole machine.

In FIG. 5 , ω is the rotational speed of the motor 6 .

The above formulas 1 and 2 are further calculated to obtain:

mr=m _e r _e +m ₂ r ₂ +m ₁ r ₁

mrL=m _e r _e L _e +m ₂ r ₂ L ₂ -m ₁ r ₁ L ₁

From this, the relevant parameters such as the number and diameter of the balance balls 22 can be calculated

Embodiment 7

In this embodiment, a washing machine balancing device 2 includes a hollow annular casing 21 coaxially disposed on the washing machine drum 1, and a movable balancing ball 22 disposed in the hollow annular casing 21. The balance ball 22 produces magnetic damping of the damping portion 23.

This embodiment is a further limitation of the third embodiment. As shown in FIG. 6 , the design method of the inner and outer magnetic rings 232 is as follows:

As shown in FIG. 6 , when the balance ball 22 moves in the magnetic field, because the balance ball 22 cuts the magnetic field line, the magnetic field will generate a magnetic damping force that hinders the balance ball 22 from moving forward. Its damping force is:

FB=KV Formula 3

In formula 3, K is the magnetic damping coefficient. The width L ₀ , the magnetic induction intensity B ₀ , the gap d ₁ between the balance ball 22 and the magnetic ring, and the diameter d ₂ of the balance ball 22 are related.

The specific relationship is

V is the movement speed of the balance ball 22 relative to the inner barrel.

By determining the relative velocity V of the balance ball 22 and the inner barrel, and the diameter d ₂ and the gap d ₁ of the balance ball 22, it can be ensured that the balance ball 22 does not collide in the initial stage, and when the balance ball 22 is in the best position to correct the eccentricity in the high-speed stage, The size of the magnetic ring and the corresponding magnetic induction can be determined, and then the optimal size and material can be determined.

Embodiment 8

In this embodiment, a balancing device for a washing machine includes a hollow annular casing coaxially disposed on the rotating tub of the washing machine, a movable balancing ball disposed in the hollow annular casing, and a magnetic resistance generated by the moving balancing ball. Ni's damping section.

This embodiment is a further limitation of Embodiments 1, 2, 3, 4, and 5. The balancing device of the washing machine further includes a plurality of spacers that move together with the balance balls, and the spacers space between two adjacent balance balls. , to prevent collision between two adjacent balance balls.

Further, the spacers are spacer balls made of non-metallic materials, and the spacer balls are arranged at intervals between every two adjacent balance balls. Preferably, the isolation ball is made of plastic/rubber, and has a certain elasticity, or the collision with the balance ball makes little noise.

Embodiment 9

In this embodiment, a balancing device for a washing machine includes a hollow annular casing coaxially disposed on the drum of the washing machine, and a movable balancing ball disposed in the hollow annular casing, and also includes making the moving balancing ball generate magnetic resistance Ni's damping section.

Compared with the eighth embodiment, the difference is that the spacer is an annular structure sleeved on the radial outer circumference of the balance ball, and the annular structure is arranged on the rotation plane of the balance ball.

Further, the separator is made of a non-metallic material. It is preferably made of plastic/rubber, with a certain elasticity, or with low collision noise.

Embodiment ten

In this embodiment, a balancing device for a washing machine includes a hollow annular casing coaxially disposed on the drum of the washing machine, and a movable balancing ball disposed in the hollow annular casing, and also includes making the moving balancing ball generate magnetic resistance Ni's damping section.

This embodiment is further defined as the ninth embodiment, wherein the annular structure further includes a bump near the adjacent balance ball.

Embodiment 11

In this embodiment, a balancing device for a washing machine includes a hollow annular casing coaxially disposed on the drum of the washing machine, and a movable balancing ball disposed in the hollow annular casing, and also includes making the moving balancing ball generate magnetic resistance Ni's damping section.

In this embodiment, as a further limitation of Embodiment 8, the diameter of the isolation ball is smaller than the diameter of the balance ball.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Within the scope of the technical solution of the present invention, personnel can make some changes or modifications to equivalent examples of equivalent changes by using the above-mentioned technical content, but any content that does not depart from the technical solution of the present invention is based on the technical solution of the present invention. Substantially any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (11)

1. A washing machine balancing device, comprising a hollow annular casing coaxially arranged on the rotating tub of the washing machine, and a movable balancing ball arranged in the hollow annular casing, characterized in that: it also includes making the moving balancing ball generate a magnetic field. damping part of the damping; The damping part is a ring magnet, and the ring magnet is coaxially arranged with the hollow annular shell. The relationship between the magnetic damping force generated when the balance ball moves in the magnetic field and the size, material and diameter of the balance ball is: :

Where K is the magnetic damping coefficient, L ₀ is the radial width of the ring magnet, B ₀ is the magnetic induction intensity, d ₁ is the gap between the balance ball and the magnet, and d ₂ is the diameter of the balance ball. 2. A kind of washing machine balancing device according to claim 1, is characterized in that: The annular magnet is arranged on the outer side of at least one surface of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular casing; Alternatively, the ring magnet is disposed on at least one side of the upper surface, the lower surface, the inner annular surface and the outer annular surface of the hollow annular housing. 3 . The balancing device of claim 1 , wherein the balancing ball is made of non-magnetic metal. 4 . 4. A washing machine balancing device according to claim 3, wherein the balancing ball is a stainless steel ball. 5. A washing machine balancing device according to claim 1, characterized in that: the washing machine balancing device further comprises a plurality of spacers moving together with the balance balls, and the spacers space between two adjacent balance balls. . 6 . The balancing device of a washing machine according to claim 1 , wherein the balancing device of the washing machine is arranged at the bottom of the rotating tub of the washing machine. 7 . 7 . The balancing device for a washing machine according to claim 6 , wherein the hollow annular casing of the balancing device for the washing machine comprises a first casing and a second casing, and the first casing includes a balancing device capable of accommodating the balance. 8 . A chamber in which the ball moves, and the second housing cooperates with the first housing to close the chamber. 8 . The balancing device for a washing machine according to claim 7 , wherein the first shell is integrally formed at the bottom of the washing machine drum, and a flange is installed at the bottom of the washing machine drum, and the flange forms a first Two shells. 9. A washing machine balancing device according to claim 7 or 8, characterized in that: the damping part is arranged on the outer side of the inner annular surface of the hollow annular casing to form an inner magnetic ring, and/or the damping part is arranged An outer magnetic ring is formed on the outer side of the outer annular surface of the hollow annular casing. 10 . The balancing device for a washing machine according to claim 9 , wherein the bottom of the washing machine drum is provided with a connecting portion connected with a flange, and the inner magnetic ring and/or the outer magnetic ring are divided by the connecting portion. 11 . Magnetic ring segments arranged uniformly in the circumferential direction. 11. A washing machine, characterized in that it comprises the washing machine balancing device according to any one of claims 1-10.

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