JP2015037485A - Drum-type washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drum-type washing machine that can promptly suppress imbalance which a balancer itself generates in a ball balancer system at the start of rotation of the drum.SOLUTION: The drum-type washing machine includes: a bottomed cylindrical drum 3 that is supported in a freely rotatable manner by a horizontal or inclined revolving shaft 35 and has a drum opening 3a through which laundry 13 is inputted; a water tub 2 that accommodates the drum 3; a motor 4 that rotationally drives the drum 3; a ball balancer 30 that is provided in the vicinity of a peripheral part of a drum end on a drum opening 3a side and has a tubular container 17a inside of which a plurality of freely movable balls 8 are accommodated; a fluid balancer 31 that is provided in the vicinity of a peripheral part of a drum end on a side opposite to the drum opening 3a side and has a tubular container 17b inside of which a liquid 32 is filled; and control means 6 that controls the motor 4. The control means 6 repeats acceleration and deceleration while rotating the drum 3 in a same direction at the start of rotation of the drum 3 to disperse the balls 8 inside the tubular container 17a of the ball balancer 30.

Description

  The present invention relates to a drum-type washing machine that includes a rotatable drum that accommodates laundry and performs washing, rinsing, and dewatering of the laundry within the drum.

  In general, in a dewatering process of a drum-type washing machine having a horizontal or inclined rotating shaft, the laundry is often in a non-uniform state, that is, an unbalanced state in the drum. As a result, a biased force is applied to the rotating shaft during dehydration, and vibration is generated. The amplitude of vibration increases in proportion to the square of the rotational speed of the rotating drum. Problems such as the washing machine itself moving due to the vibrations and being unable to operate at a rotational speed higher than a certain speed due to intense noise occur.

  In order to reduce the vibration caused by the unbalance of the laundry, a fluid balancer system using a liquid is widely used in drum-type washing machines in Japan. The fluid balancer encloses about half of salt water or water in consideration of water or freezing prevention in a passage in which a hollow tube is provided in an annular shape around the opening on the end side where laundry is put into the drum. For unbalance caused by the eccentric load of laundry during high-speed rotation (for example, rotation exceeding 900 rpm), a dynamic phenomenon is used in which the liquid automatically moves to the position opposite to the unbalanced position by natural providence. It is a balance device.

  On the other hand, in recent years, a ball balancer system using metal balls (hereinafter also referred to as balls) has been proposed as a new balancer system (see, for example, Patent Document 1). The ball balancer includes a plurality of balls that are movable in a rotation direction (circumferential direction) in a chamber of a tubular container formed in an annular shape attached to the inner periphery of the drum, and further has a predetermined viscosity in the same chamber. Viscous liquid such as silicon oil is sealed to limit the friction between the ball and the chamber. Similar to the fluid balancer, this ball balancer absorbs the unbalance by exhibiting the characteristic of automatically moving to the position opposite to the unbalance position against the unbalance caused by the eccentric load.

  Here, the superiority of the ball balancer over the fluid balancer will be described. The major difference between the ball balancer and the fluid balancer is the ball housed inside the chamber. The specific gravity of the metal sphere is clearly higher than that of the liquid, and the ball is heavier even if the same volume is accommodated inside the chamber.In other words, the maximum unbalance suppression during dehydration when the drum rotates at a high speed is overwhelming compared to the liquid. The ball is bigger. Therefore, a drum using a ball balancer has a high effect of suppressing imbalance even if the fabric bias during dehydration is large.

  In addition, a single ball balancer configuration in which the ball balancer is arranged only at the end peripheral portion on the opening side where the laundry is put into the drum, and in addition, ball balancers are provided at two peripheral portions on both the opening side and the bottom side of the drum. There are known double ball balancers for placement. Most drum-type washing machines using a ball balancer have a double ball balancer configuration. The principle is the same for a single ball balancer and a double ball balancer. In other words, both ball balancers have a mechanism in which a plurality of balls change their positions corresponding to the amount of laundry unbalance that changes over time during dehydration and automatically correct the unbalance (for example, , See Patent Document 2).

In Patent Document 2, when a double ball balancer configuration is adopted, the same ball balancer is arranged at two locations on both ends of the drum cylinder. In addition, the rotating shaft of the electric motor, which is a driving means, is a drum rotation support structure, and is firmly fixed to the bottom plate via a bearing.

  In this configuration, the same laundry, for example, when one bath towel is wet and placed near the drum bottom and when it is placed near the drum opening, the same laundry is placed. Since only the position is changed, the eccentric load that is theoretically generated is the same, and the vibration width in which the drum swings due to unbalance is considered to be the same everywhere on the drum. However, even if the same fabric bias actually occurs, if the position is near the drum opening, the vibration width of the drum is large, and if it occurs near the drum bottom, the rotating shaft directly connected to the bottom vibrates. It has a characteristic that the vibration width is small because a part of it is absorbed. This is because, when the same ball balancer is simply placed at both ends of the drum cylinder, the ball balancer attached to the bottom side, in particular, has an excessive restraining force for the small vibration width generated on the bottom side, and when dehydration is started or stopped Occasionally, a phenomenon occurs in which balls that are not used for unbalance suppression collide with each other, and the resulting metal noise becomes a new noise problem.

  On the other hand, a new type balancer system has been proposed in which the ball balancer on the opening side of the drum remains as it is, and only the ball balancer on the bottom side is replaced with a fluid balancer. FIG. 5 is a perspective view of a drum of a conventional drum type washing machine, and shows a schematic state of the ball balancer 30 and the fluid balancer 31 at the start of rotation. If this system is used, a high unbalance suppression effect can be exhibited by installing the ball balancer 30 in the vicinity of the drum opening 3a where the vibration width of the drum 3 due to the bias of the laundry 13 is large. On the other hand, by arranging the fluid balancer 31 on the drum bottom surface 3b side where the vibration width of the drum 3 is small, an appropriate imbalance suppression effect is exhibited, and no ball balancer is arranged on the drum bottom surface 3b side. No noise is generated.

Japanese Patent Laid-Open No. 9-187597 JP 2012-122576 A

  However, in the conventional configuration, the ball balancer system has an overwhelming effect of suppressing the imbalance caused by the eccentric load of the laundry when the drum rotates at a high speed (for example, when it exceeds 900 rpm). On the other hand, since the ball is heavier than the fluid from the beginning of drum rotation to high-speed rotation (hereinafter referred to as drum rotation start), the overall imbalance is larger, that is, drum vibration. Due to the large width, abnormal vibrations occurred, often causing a problem that the equipment stopped.

  Supplementally, in the case of a fluid balancer system, when the drum starts rotating and when the drum rotates at a low speed, the liquid such as water in the passage that constitutes the fluid balancer is not uniformly distributed throughout the passage. doing. For this reason, the eccentric load generated in the balancer itself is overwhelmingly smaller than the eccentric load of the laundry, so when using a fluid balancer, the overall imbalance is the same as the unbalance due to the eccentric load of the laundry. You may think.

  On the other hand, in the case of the ball balancer system, the rolling elements (a plurality of balls) in the chamber of the tubular container constituting the ball balancer at the start of rotation of the drum and at the low speed rotation of the drum, There is a tendency to gather in one place, and the eccentric load generated in the balancer itself may be equal to or larger than the eccentric load of the laundry. For this reason, when a ball balancer is used, the overall imbalance is the sum of the unbalance due to the eccentric load of the laundry and the unbalance of the ball balancer itself.

  As a supplement to the summation here, when the drum starts rotating, the position around the drum where the unbalance of the ball balancer itself occurs accidentally relative to the position around the drum where the unbalance due to the eccentric load of the laundry occurs. In the case of the opposite positional relationship, the overall imbalance may become extremely small by summing up by canceling each other's imbalance, but on the contrary, the two imbalances that occur are generated. If the positions to be operated are the same, the vibration width due to the drum swinging will be extremely increased due to the summation, resulting in equipment stoppage due to abnormal vibration or failure. In any case, the root cause is that the ball balancer itself generates a large unbalance when the drum starts to rotate.

  The present invention solves the above-described conventional problems. In a ball balancer system using rolling elements such as metal balls, the overall balance of the ball balancer itself is suppressed by suppressing the unbalance generated at the start of drum rotation. An object of the present invention is to provide a drum type washing machine that reduces unbalance.

  In order to solve the above-described conventional problems, a drum-type washing machine of the present invention is supported by a horizontal or inclined rotating shaft so as to be rotatable, and has a bottomed cylindrical drum having a drum opening into which laundry is put. , A water tank for housing the drum, a driving means for rotating the drum, and a drum end provided in the vicinity of the drum end peripheral portion on the drum opening side, and can be moved inside a tubular container in which a hollow tube is formed in an annular shape. A ball balancer in which a plurality of rolling elements are housed, and a fluid that is provided in the vicinity of the drum end periphery on the opposite side of the drum opening and in which a liquid is filled in a tubular container in which a hollow tube is formed in an annular shape A balancer; and a control means for controlling the drive means. The control means repeats acceleration / deceleration while rotating the drum in the same direction at the start of rotation of the drum, so that the tubular container of the ball balancer is Wherein is the rolling elements that is to be dispersed in part.

  With this configuration, the control means performs acceleration / deceleration while rotating the drum in the same direction, for example, 120 rpm for 3 seconds and 90 rpm for 5 seconds, from the start of drum rotation to the high speed rotation when the drum starts rotating. Repeat the set of seconds 4 times. As a result, the rolling elements gathered at the bottom of the tubular container constituting the ball balancer are quickly separated from each other and dispersed throughout the interior of the tubular container, so the eccentric load of the ball balancer itself Can suppress the unbalance generated. This reduces the overall imbalance of the drum, reducing vibration and noise, and enables the drum rotation to shift to high-speed rotation quickly, shortening the operation time and saving power (contributing to energy conservation). Can be improved.

  The drum type washing machine of the present invention can quickly suppress the unbalance caused by the eccentric load of the ball balancer itself, reduce the overall unbalance of the drum, reduce vibration and noise, The rotation can be quickly shifted to a high speed rotation.

Side surface sectional drawing of the drum type washing machine in Embodiment 1 of this invention The perspective view of the drum of the drum type washing machine in Embodiment 1 of this invention The block diagram of the ball balancer of the drum type washing machine in Embodiment 1 of this invention The perspective view of the drum of the drum type washing machine in Embodiment 1 of this invention Perspective view of drum of conventional drum type washing machine

  A drum-type washing machine according to a first aspect of the present invention is a cylindrical drum with a bottom that is rotatably supported on a horizontal or inclined rotating shaft and has a drum opening into which laundry is put, and a water tank that houses the drum. And a driving means for rotating the drum, and a plurality of rolling elements which are provided in the vicinity of the drum end peripheral portion on the drum opening side, and which are movable inside the tubular container in which the hollow tube is formed in an annular shape. A ball balancer, a fluid balancer provided near the end of the drum opposite to the drum opening and filled with a liquid inside a tubular container having a hollow tube formed in an annular shape, and the drive means And the control means disperses the rolling elements within the tubular container of the ball balancer by repeating acceleration and deceleration while rotating the drum in the same direction at the start of rotation of the drum. Those were Unishi.

  With this configuration, the control means performs acceleration / deceleration while rotating the drum in the same direction, for example, 120 rpm for 3 seconds and 90 rpm for 5 seconds, from the start of drum rotation to the high speed rotation when the drum starts rotating. Repeat the set of seconds 4 times. As a result, the rolling elements gathered at the bottom of the tubular container constituting the ball balancer are quickly separated from each other and dispersed throughout the interior of the tubular container, so the eccentric load of the ball balancer itself Can suppress the unbalance generated. This reduces the overall imbalance of the drum, reducing vibration and noise, and enables the drum rotation to shift to high-speed rotation quickly, shortening the operation time and saving power (contributing to energy conservation). Can be improved.

  In a second aspect based on the first aspect, the control means is configured to disperse the liquid in the tubular container of the fluid balancer by repeating acceleration and deceleration of the drum at the start of rotation of the drum. It is a thing. Due to this configuration, even in a balancer system comprising a combination of a ball balancer and a fluid balancer, the liquid in the tubular container constituting the fluid balancer is generated in the fluid balancer itself by dispersing it throughout the interior of the tubular container without staying in one place. Can be further suppressed.

  According to a third invention, in the first or second invention, the rolling element comprises a metal sphere. With this configuration, the metal has a larger specific gravity than the liquid, and a sufficient unbalance suppression force can be generated even with a small amount.

  According to a fourth invention, in any one of the first to third inventions, the ball balancer is filled with a predetermined amount of liquid having a predetermined viscosity. With this configuration, for example, a liquid such as silicon oil having a certain viscosity is sealed inside the ball balancer, so that friction between the rolling element and the tubular container can be suppressed and mutual wear can be prevented.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a side cross-sectional view of a drum-type washing machine according to Embodiment 1 of the present invention. Inside the drum type washing machine 1, a bottomed cylindrical water tank 2 is accommodated. A bottomed cylindrical drum 3 is accommodated in the water tank 2. On the front side (left side in FIG. 1) where the laundry of the drum-type washing machine 1 is put in, a door 7 is provided so as to be openable and closable, and the drum opening 3a communicating with the drum 3 through the water tank opening 2a of the water tank 2 is a drum. 3 is provided. The drum 3 has a rotation shaft 35 for rotating and supporting the drum 3 on the drum bottom surface 3b, and is arranged so as to be inclined so that the bottom surface side is lower than the front surface side. The water tank 2 is also inclined so as to follow the drum 3. By tilting the rotating shaft 35, the drum opening 3a can be disposed obliquely upward, and the user can take out the laundry in the drum 3 without taking a posture of bending greatly. Compared with the case where the rotating shaft 35 is in the horizontal direction, the water supplied into the water tank 2 is accumulated on the back side, and a deep water storage state can be obtained even with a small amount of water. In other words, the laundry easily contains water even with a small amount of water supply. The water tank 2 is suspended by a spring 10 provided at the upper part, and is elastically supported by a damper 5 provided at the lower part. In addition, although the ease of taking out the laundry and the usefulness of the water supply amount are reduced, the rotating shaft 35 may be horizontal.

  The water tank opening 2a is fitted with a tubular sealing material (not shown) at its mouth edge. The front side of the sealing material comes into contact with the back side of the door 7 and seals, and even if the water tank opening 2a of the water tank 2 that swings up and down, right and left and back and forth moves, the sealing material is deformed and pressed to the back side of the door 7 Therefore, hermeticity is maintained. A motor 4 is attached to the lower part of the outside of the water tank 2 as a driving means for rotationally driving the drum 3. The rotation drive of the motor 4 is transmitted to the drum pulley 24 provided on the rotation shaft 35 of the drum 3 via the belt 23. Thereby, the drum 3 is rotationally driven by the rotation of the motor 4.

  A baffle 16 that can lift and drop the laundry 13 is provided inside the drum 3. When the drum 3 is driven to rotate, the laundry lifted by the baffle 16 is struck against the water surface or the like from the upper part of the drum 3 and is washed by the mechanical force of tapping. Further, the drum 3 is provided with a plurality of through holes 15. Water can be passed from the water tank 2 into the drum 3 through the through holes 15.

  A control means 6 for controlling the motor 4 and the like, and controlling processes such as washing, rinsing and dehydration is provided at the lower part on the front side of the drum type washing machine 1. The control means 6 has a system that can manage all input / output control with a timer, including various sensor outputs such as water supply valve 11, drain pump 19 and motor 4 drive control, and water level sensor (not shown). Yes.

  FIG. 2 is a perspective view of the drum of the drum type washing machine according to Embodiment 1 of the present invention, showing a state in which the rotation is stopped. Since the drum-type washing machine 1 has the rotating shaft 35 of the drum 3 horizontally or inclined, the stored laundry 13 is biased in the drum 3 toward the lower part on the drum bottom surface 3b side. Therefore, when the drum 3 rotates at a high speed, the laundry 13 rotates in a biased state, so that a large vibration is generated as it is. In order to suppress the vibration, a balancer that balances with the laundry 13 is necessary.

  In the first embodiment, a ball balancer 30 is provided in the vicinity of the drum end periphery on the drum opening 3a side, and a fluid balancer 31 is provided in the vicinity of the drum end periphery on the opposite drum bottom surface 3b side. These balancers are those in which a weight is accommodated inside a tubular container 17 in which a hollow tube is formed in an annular shape, and the ball balancer 30 is a ball of a metal sphere that is a rolling element as a weight inside the tubular container 17a. 8 is accommodated, and the fluid balancer 31 is filled with about half of the liquid 32 as a weight inside the tubular container 17b. As the liquid 32, normal water or salt water is used in consideration of prevention of freezing in winter.

  FIG. 3 is a schematic diagram of the ball balancer 30 of the drum type washing machine 1 according to Embodiment 1 of the present invention. The basic structure of the ball balancer 30 is the same as that of the conventional ball balancer. The ball balancer 30 includes a tubular container 17a disposed on the drum opening 3a side, a ball 8 movable in the tubular container 17a, and a viscous liquid 18. The tubular container 17a is installed so that the axes of the drum 3 and each other coincide. The viscous liquid 18 is silicon oil or the like and controls the movement of the ball 8. It should be noted that the same effect can be obtained with other viscous liquids and is not limited to silicone oil.

As shown in FIG. 2, when the drum 3 is stopped, the laundry 13 tends to be positioned at the lower part on the drum bottom surface 3 b side, and the liquid 32 in the tubular container 17 b that constitutes the fluid balancer 31. Remains at the bottom. Further, the plurality of balls 8 inside the tubular container 17a of the ball balancer 30 are also gathered at the lower part. Although the viscous liquid 18 in the tubular container 17a is not shown in FIG. 2, an appropriate amount is always present between the plurality of balls 8 and the tubular container 17a.

  First, the balancer system of the conventional drum type washing machine 1 will be described with reference to the drawings. FIG. 5 is a perspective view of a drum of a conventional drum-type washing machine and shows a schematic state of a ball balancer and a fluid balancer at the start of rotation. FIG. 5 shows the movement of the ball 8 and water inside the tubular container 17a at the start of rotation of the drum 3, and is the same component as FIG.

  In FIG. 5, when one bath towel as the laundry 13 is put in the drum 3 in a wet state and the dehydration process is started, the load becomes an eccentric load due to the cloth of the laundry 13 and unbalance occurs. The vibration width of the drum swing due to the unbalanced eccentric load is considered to be the same everywhere on the drum 3, but in reality, the rotating shaft 35 directly connected to the bottom surface absorbs part of the vibration in the vicinity of the drum bottom surface 3b. Therefore, the vibration width is small, and in the vicinity of the drum opening 3a, the vibration width is large. In this figure, for easy understanding, the size of the unbalance due to the laundry 13 is expressed as the size of the arrow 40 located in the drum opening 3a.

  The magnitude of the unbalance generated by the eccentric load of the fluid balancer 31 and the ball balancer 30 when the drum 3 starts rotating, particularly when the rotational speed is low speed of 80 to 100 rpm will be described. First, with respect to the fluid balancer 31, water inside the tubular container 17b constituting the fluid balancer 31 is dispersed approximately uniformly along the inner periphery of the tubular container 17b by centrifugal force. That is, the magnitude of the imbalance generated by the eccentric load of the fluid balancer 31 itself is extremely smaller than that of the laundry 13, so that it may be considered that there is no imbalance.

  On the other hand, the plurality of balls 8 in the tubular container 17a of the ball balancer 30 is such that the weight of the ball 8 itself is heavier than the liquid 32 such as water, or a viscous liquid having a certain viscosity inside the tubular container 17a. 18 is contained and there is friction between the ball 8 and the tubular container 17a. From this, in the case of the ball balancer 30, when the drum 3 is rotated at a low speed, even if a certain amount of centrifugal force is applied, one location around the middle between the lowermost end and the uppermost end of the drum circumference as shown in FIG. Tend to gather. Although the magnitude of the unbalance generated by the eccentric load of the ball balancer 30 itself is expressed as the size of the arrow 41, the magnitude of the unbalance of the ball balancer 30 itself is equal to the eccentric load of the laundry 13 or It can be big.

  As described above, the overall unbalance on the drum opening 3a side where the ball balancer 30 is provided is the sum of the unbalance due to the eccentric load of the laundry 13 and the unbalance of the ball balancer 30 itself. It becomes. To supplement the summation here, since the position of the unbalance generated by the eccentric load of the laundry 13 is indefinite, the position of the periphery of the drum 3 where the unbalance of the ball balancer 30 itself occurs at the start of rotation of the drum 3 is If the position of the drum 3 peripheral portion where the unbalance due to the eccentric load of the laundry 13 occurs is accidentally opposed, the overall unbalance is increased by canceling the unbalance between each other. On the other hand, if the position where the two imbalances occur is approximately the same as shown in FIG. 5, the total unbalance may occur. Is the sum of the arrow 40 and the arrow 41, the vibration width due to the swing of the drum 3 is extremely increased, and abnormal vibration occurs. Further, if the swing is large, the performance of the balance function of the ball balancer 30 is increasingly delayed, and the shift to the high speed rotation of the drum 3 cannot be performed quickly.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a perspective view of the drum of the drum type washing machine according to the first embodiment of the present invention, and shows the state of the ball balancer 30 and the fluid balancer 31 at the start of rotation.

  As in the prior art, when a bath towel is put into the drum as the laundry 13 in the wet state and the dehydration process is started, an unbalance occurs due to the eccentric load due to the cloth bias of the laundry 13, and the unbalance is generated. However, the difference from the conventional example is that the control means 6 changes the rotation control method of the drum 3 to reduce the unbalance caused by the eccentric load of the ball balancer 30 itself. It is to have lost as much as possible.

  Specifically, at the start of rotation of the drum 3 from the start of rotation of the drum 3 to the high speed rotation, the control means 6 performs acceleration / deceleration in small increments while rotating the drum 3 in the same direction. For example, the set operation of “120 rpm for 3 seconds and 90 rpm for 5 seconds” is repeated 4 times (8 times in total). By this rotation control, the plurality of balls 8 in the tubular container 17a of the ball balancer 30 are initially gathered at one place, but the balls 8 are gradually separated from each other, and as shown in FIG. It is dispersed throughout the container 17a. Thus, since the magnitude of the unbalance generated by the eccentric load of the ball balancer 30 itself is extremely smaller than that of the laundry 13, it may be considered that there is no unbalance.

  There are various factors other than the combination of the number of revolutions, time, and number of revolutions in acceleration / deceleration, and the drum shape, ball weight and quantity, viscous liquid state, time until dispersion, etc. However, the upper limit of the higher predetermined rotational speed of 120 rpm is not limited as long as the vibration is not significant due to the resonant rotational speed, for example, about 150 rpm. Further, the lower limit of the lower predetermined number of revolutions of 90 rpm is sufficient if the clothes in the drum do not drop due to insufficient centrifugal force, for example, about 80 rpm, and the width of the predetermined number of revolutions may be 15 rpm. Further, different rotational speeds may be added, and it is effective to perform acceleration / deceleration in a total of about 2 to 15 times in small increments of about 0 seconds (continuous change) to 10 seconds for maintaining the predetermined rotational speed. is there. There is no need to repeat the set.

  With such a configuration, at the start of rotation of the drum 3 from the start of rotation of the drum 3 to high speed rotation, the control means 6 repeats acceleration / deceleration in small increments while rotating the drum 3 in the same direction. The plurality of balls 8 gathered at one place in the tubular container 17a constituting the balancer 30 are separated from each other and quickly dispersed throughout the tubular container 17a. In this way, by suppressing the unbalance that occurs due to the eccentric load of the ball balancer 30 itself, the overall unbalance of the drum can be reduced, and vibration and noise can be reduced. And it becomes possible to transfer to the high speed rotation of the drum 3 quickly, and shortening of operation time and power saving (contribution to energy saving) can be improved.

  The drum type washing machine according to the present invention is a balancer system using a ball balancer, and at the start of drum rotation from the start of drum rotation to high speed rotation, the drum is accelerated and decelerated in small increments while rotating the drum in the same direction. Is repeated to quickly disperse a plurality of balls in the tubular container in which the hollow tube constituting the ball balancer is formed into an annular shape throughout the tubular container, thereby generating an unbalance caused by the eccentric load of the balancer itself. Therefore, it is possible to reduce vibration and noise by reducing the overall unbalance of the drum, so that it is useful as a drum-type washing machine or a cleaning device for home use or business use.

DESCRIPTION OF SYMBOLS 1 Drum-type washing machine 2 Water tank 3 Drum 3a Drum opening 4 Motor 6 Control means 8 Ball 13 Laundry 17, 17a, 17b Tubular container 18 Viscous liquid 30 Ball balancer 31 Fluid balancer 32 Liquid 35 Rotating shaft

Claims (4)

A bottomed cylindrical drum that is rotatably supported on a horizontal or inclined rotating shaft and has a drum opening into which laundry is placed; a water tank that houses the drum; and a drive unit that rotationally drives the drum; A ball balancer provided in the vicinity of the drum end peripheral portion on the drum opening side and containing a plurality of freely movable rolling elements inside a tubular container in which a hollow tube is formed in an annular shape; and opposite to the drum opening A fluid balancer that is provided in the vicinity of the drum end periphery on the side and in which a hollow tube is formed in an annular shape and is filled with liquid, and a control means that controls the drive means, the control means comprising: A drum type washing machine in which the rolling elements are dispersed inside the tubular container of the ball balancer by repeating acceleration and deceleration while rotating the drum in the same direction at the start of rotation of the drum. The drum type washing machine according to claim 1, wherein the control means is configured to disperse the liquid in a tubular container of the fluid balancer by repeatedly accelerating and decelerating the drum at the start of rotation of the drum. The drum type washing machine according to claim 1 or 2, wherein the rolling elements are made of metal balls. The drum type washing machine according to any one of claims 1 to 3, wherein the ball balancer is filled with a predetermined amount of liquid having a predetermined viscosity.

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