JP2015159918A - washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine which suppresses vibration not only at dewatering start-up time but also during high-speed rotation.SOLUTION: A washing machine includes an inner tub having a rotary vane at a bottom part, an outer tub including the inner tub, an outer frame for accommodating the outer tub and a vibration-proof device for suspending and supporting the outer tub at the outer frame, and it performs each step of washing, rinsing and dewatering. The washing machine has a water storage part for storing a liquid at an upper side of the outer tub, and discharges the liquid inside the water storage part in the middle of the dewatering step.

Description

  The present invention relates to low vibration of a washing machine.

  A typical washing machine includes an inner tub having rotating wings at the bottom, an outer tub that contains the inner tub, an outer frame that houses the outer tub, and an anti-vibration system that supports the outer tub suspended from the outer frame. The apparatus includes a washing shaft to which the rotating blades are attached, and a motor that drives the washing shaft. In the washing machine configured as described above, when the inner tub is rotated at a high speed for the centrifugal dehydration process in the state where the clothes in the inner tub are offset after the washing and rinsing steps, the outer tub is caused by resonance in the process of increasing the rotation speed. Vibration is generated in the washing machine, and large vibration and noise are generated in the washing machine. Therefore, the vibration is reduced by increasing the damping of the vibration isolator or increasing the weight of the outer tank which is a stationary object. However, when the outer tub weight increases, the weight of the main body also increases, which makes installation work and the like difficult. Therefore, a structure in which the outer tub weight is changed so that it is heavy during operation and light when stopped is preferable.

  Therefore, there is JP-A-5-131075 (Patent Document 1) as background art in this technical field. In this publication, a tank for storing water is provided in an outer tub, and the tank is filled with water before dehydration is started. For this reason, the weight of this water is added to the outer tank and it becomes heavier. With this weight, it is possible to suppress a large vibration of the outer tub during dehydration activation. As the dehydration process proceeds and the drum enters a high speed and reaches a constant speed, the vibration and acceleration of the outer tub gradually decrease. It is described that this is detected by a vibration sensor, and the water in the tank is drained through a drain hose and a drain valve to lighten the outer tank.

JP-A-5-131075

  However, the technique disclosed in Patent Document 1 does not take into consideration the natural frequency at which the outer tub and the inner tub vibrate in opposite phases, which are higher than the maximum rotation speed in the dehydration operation. For example, when water is stored in the tank, the weight of the outer tub increases and the natural frequency at which the outer tub and the inner tub vibrate in opposite phases decreases. For this reason, when high-speed operation is performed up to the same maximum rotation speed with water stored in the tank, there is a possibility that an increase in vibration due to a decrease in the natural frequency in the opposite phase between the outer tank and the inner tank cannot be ignored.

  An object of the present invention is to provide a washing machine that suppresses vibrations not only at the start of dehydration but also at high speed rotation.

  In order to achieve the above object, the present invention provides an inner tank having a rotor blade at the bottom, an outer tank containing the inner tank, an outer frame for storing the outer tank, and the outer tank in the outer frame. A washing machine having a vibration isolator for supporting suspension and performing washing, rinsing, and dewatering steps, having a water storage portion for storing liquid on the upper side of the outer tub, and liquid in the water storage portion in the middle of the dewatering step Is discharged.

  ADVANTAGE OF THE INVENTION According to this invention, the washing machine which suppressed the vibration not only at the time of dehydration starting but at the time of high speed rotation can be provided, suppressing the weight increase at the time of installation.

1 is a longitudinal sectional view of a washing machine according to Embodiment 1. FIG. 1 is a plan sectional view of a washing machine according to Embodiment 1. FIG. It is a schematic explanatory drawing explaining an example of the vibration at the time of dehydration. 3 is a flowchart for explaining opening and closing timings of the respective water supply / drainage valves according to the first embodiment. 1 is a longitudinal sectional view of a washing machine according to Embodiment 1. FIG. It is an example of the dehydration drive pattern of a washing machine. 6 is a partial cross-sectional view of a washing machine according to Embodiment 2. FIG. 6 is a partial cross-sectional view of a washing machine according to Embodiment 2. FIG. 6 is a longitudinal sectional view of a washing machine according to Embodiment 3. FIG. It is a flowchart explaining the opening / closing timing of each water supply / drain valve which concerns on Example 3. FIG. 6 is a longitudinal sectional view of a washing machine according to Embodiment 4. FIG. It is a flowchart explaining the opening / closing timing of each water supply / drain valve which concerns on Example 4. FIG. 10 is a longitudinal sectional view of a washing machine according to Embodiment 5. FIG. It is a flowchart explaining the opening / closing timing of each water supply / drain valve which concerns on Example 5. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

  <Embodiment 1> FIGS. 1 and 2 show the overall structure of a washing machine according to an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the washing machine, and FIG. 2 is a plan sectional view of the washing machine. In this figure, only basic components of the washing machine are described, and other elements such as a panel switch are omitted and not shown. The main components are an outer frame 1, an outer tub 3 made of synthetic resin elastically supported by the outer frame 1 via a vibration isolator 2, an inner tub 3 and an inner rotator 4, and clothing, etc. A SUS inner tub 5 in which a fluid balancer 10 for canceling the unbalance of the laundry is attached, an aluminum flange 6 for fixing the inner tub 5 to the dehydrating shaft 11, and a washing shaft supporting the flange 6 11 and a dehydrating shaft 12 constituting an inner / outer double structure, a speed reduction mechanism 7 that decelerates an input from the motor 8 with a gear when driving the washing shaft 11, and a motor 8 provided on the same axis as the speed reduction mechanism 7. The mounting plate 9 supports the speed reduction mechanism 7 and the motor 8 and is held by the outer tub 3. The motor 8 rotates only the rotating blade 4 through the washing shaft 11 via the speed reduction mechanism 7 during washing, and performs centrifugal dehydration by rotating both the inner tub 5 and the rotating blade 4 at high speed through the dehydrating shaft 12 during dehydration. . Here, since many water flow holes 5a are provided in the outer peripheral part of the inner tub 5, the water contained in the laundry is squeezed out along with the high-speed rotation. At this time, if the laundry in the inner tub 5 is displaced, the inner tub 5 and the outer tub 3 vibrate, and particularly vibrate greatly due to resonance at the start of the spin-drying rotation. Therefore, in order to prevent excessive vibration of the outer tub 3 and suppress it to a predetermined amplitude or less even with imbalance due to the largest deviation of the laundry that can occur, the vibration is reduced by increasing the damping of the vibration isolator 2. doing.

  Here, vibration during dehydration of a general washing machine will be described with reference to FIG. In general, when the process proceeds to the dehydration step, the outer tank 3 and the inner tank 5 vibrate integrally in the same phase when the rotational speed of the inner tank 5 is gradually increased. However, the speed increase of the inner tank 5 continues, and the region of the in-phase natural frequency that causes such resonance is passed at once. Thereafter, when the rotation speed is further increased to reach a predetermined rotation speed, the water contained in the laundry is squeezed out by rotating the inner tub 5 at the rotation speed (maximum dehydration rotation speed or the like) for a predetermined time. The in-phase vibration described above mainly includes a parallel mode (a vibration mode in which the outer tub 3 and the inner tub 5 of the washing machine are in the same phase and a substantially rigid translational motion) as a primary mode, and a conical mode (a washing mode) as a secondary mode. There are two types of vibrations in which the outer tub 3 and the inner tub 5 of the machine move in a substantially rigid body with the same phase. Therefore, in order to reduce the vibration that passes when dehydration is started, the damping of the vibration isolator 2 is increased, the outer tank 3 that is stationary without rotating is made heavy, or a means for attaching a weight to the outer tank 3 Such a method can be considered. Here, since the above-mentioned conical mode vibrates with the center of gravity as the center of rotation, the vibration reduction effect can be increased by attaching a weight to a position away from the center of gravity. The center of gravity of a general washing machine is at a low position as shown in FIG. 1 in order to arrange the motor 8 and the speed reduction mechanism 7 having a large mass on the bottom surface of the outer tub 3. For this reason, in order to reduce the vibration of the conical mode, it is effective to place a weight on the upper side of the outer tub 3 away from the center of gravity.

  However, in practice, there is a natural frequency in which the outer tub 3 and the inner tub 5 vibrate greatly in the opposite phase as a tertiary mode even in a region higher than the maximum dehydration rotation speed. In addition, the negative-phase natural frequency may decrease depending on the weight of the outer tub 3 and the added weight, the amount of clothing, and the occurrence of unbalance. For this reason, even if the reverse phase natural frequency is set higher than the maximum dehydration rotation speed, if a part of the outer tub 3 is simply made heavy as described above, the reverse phase natural frequency is reduced, Large vibration may occur during high-speed dewatering operation. Further, if the upper side of the outer tub 3 far from the vibration node of the negative phase natural frequency is made heavy, the decrease of the negative phase natural frequency becomes larger than the case where the lower side of the outer tub 3 near the vibration node is made heavy. Therefore, in general, it is attached to the mounting plate 9 on the bottom surface of the outer tub 3 that is unlikely to decrease the natural frequency of the reverse phase and is easy to attach.

  Therefore, in the present embodiment, the rotation speed of the inner tank 5 after dehydration is started until the rotation speed at which the outer tank 3 and the inner tank 5 vibrate together, that is, the rotation speed corresponding to the in-phase natural frequency is exceeded. An example will be described in which the tank 3 is made heavy, the outer tank 3 is lightened before the rotation speed is exceeded and the maximum dehydration rotation speed is reached, and the negative-phase natural frequency is increased.

  Specifically, a water storage container 15 is disposed on the upper side of the outer tub 3 as a water storage part for storing liquid, and a water supply valve 16 for supplying tap water to the water storage container 15 and water from the water storage container 15 to the drain hose 14 are provided. A drain valve 17 is provided for discharging the water. The place where the water storage unit 15 is disposed needs to be at least a height above the center of the outer tub 3, but is desirably a height above the upper end of the inner tub 5.

  Next, an example of the opening / closing operation of each water supply / drainage valve after the start of the dehydration process will be described with reference to FIG. First, when the dehydration process is started, the water supply valve 15 is opened, and tap water is supplied into the water storage container 15. Next, when a predetermined time has elapsed, it is assumed that water has accumulated in the water storage container 15, the water supply valve 16 is closed, the drainage valve 13 provided in the outer tub 3 is opened, and the inside of the outer tub 3 is connected via the drainage hose 14. After draining water out of the machine, the inner tank 5 is rotated by the motor 8 to start centrifugal dehydration. At this time, the drain valve 13 provided in the outer tub 3 may be opened before the water is completely accumulated in the water storage container 15. Thereafter, the rotational speed of the inner tank 5 is increased, and when a predetermined rotational speed in the range of 300 r / min to 500 r / min is reached, it is considered that the resonance of the in-phase natural frequency has passed, and the drainage of the water storage container 15 The valve 17 is opened to start discharging water from the water storage container 15. Then, the rotational speed of the inner tank 5 is increased while discharging water, and the drainage of the water storage container 15 is completed before reaching the maximum dehydration rotational speed. When the dehydration operation time is over, the motor 8 is braked and the inner tank 5 is stopped. When the dehydration process is completed, the drain valve 13 of the outer tub 3 and the drain valve 17 of the water storage container 15 are closed. In the above example, when water is stored in the water storage container 15, it is determined that the water supply valve 16 is stored in the open time. However, a sensor for detecting the water level may be used.

  Thus, until the outer tub 3 and the inner tub 5 pass through the rotational speed at which the outer tub 3 vibrates integrally, the weight of the outer tub 3 is increased more than usual, and the vibration of the outer tub 3 at the time of dehydration activation and passing through the resonant rotational speed. Suppress. After that, the water in the water storage container 15 is drained and the weight of the outer tub 3 is reduced and returned to normal so that the large vibration of the outer tub 3 due to the natural frequencies of the opposite phases of the outer tub 3 and the inner tub 5 during high-speed rotation. Can be suppressed. The water supply / drainage valves 13, 16, and 17 are opened and closed as long as water accumulates in the water storage container 15 before resonance at the in-phase natural frequency, and water is discharged from the water storage container 15 before the maximum rotational speed of dehydration. The water supply / drainage to the water storage container 15 may use a pump instead of the valve.

  Here, an example in which a detection device for reliably determining resonance passing is provided will be described with reference to FIGS. First, since the in-phase natural frequency is known at the development stage, it is possible to specify in advance at what rotational speed the inner tank 5 passes the resonance. Therefore, the rotation speed of the inner tank 5 is obtained indirectly from the drive waveform of the motor 8 or directly from the rotation detection device provided in the motor 8, and the rotation speed of the inner tank 5 has passed the resonance rotation speed. Monitor whether. In a microcomputer-controlled washing machine, the rotational speed of the motor 8 is normally measured by any one of the above-described means, and the measured value of the rotational speed may be used. Further, as shown in FIG. 5, the vibration detection device 18 may be attached to the outer tub 3, and the passage of the resonance rotational speed may be determined from the vibration during the actual dehydration operation.

  In a general microcomputer-controlled washing machine, the dehydration operation is performed by programming the operation pattern of time and rotation speed as shown in FIG. Therefore, if the in-phase natural frequency is known, the rotational speed exceeding the resonance can be known, and it is possible to determine the elapsed time from the start of dehydration. In addition, when programmed by changing the dehydration operation pattern according to the capacity of the laundry or the selected dehydration operation time, it is necessary to determine the elapsed time from the operation pattern suitable for the capacity. In general, in a washing machine, the microcomputer measures time in the case of microcomputer control, and since it has a mechanical timer etc. in cases other than microcomputer control, it can be determined by the elapsed time from the start of dehydration. .

  <Example 2> In this embodiment, the water in the water storage container 15 disposed on the upper side of the outer tub 3 is used as water for cleaning the balancer 10, the inner tub 5, and the outer tub 3, and water for shower rinsing. An example of a method to be used will be described with reference to FIG. Here, the cleaning of the balancer 10, the inner tub 5, and the outer tub 3 is a process in which clean water is applied to the balancer 10, the inner tub 5, and the outer tub 3 to wash away detergent components and dirt from clothes during washing. . And the shower rinsing is a kind of rinsing process. In the state where the inner tub 5 is rotated at high speed while the clothing 19 is contained, the water is applied to the clothing 19 in the inner tub 5 so that the water This is a rinsing process in which the detergent component is also taken out of the garment 19 when performing centrifugal dehydration through the inside.

  Since the configuration other than the water storage container is the same as that of FIG. 1, it is omitted and FIGS. 7 and 8 show an enlarged view of the periphery of the water storage container. As shown in FIG. 7, the water storage container 20, which is a water storage unit in the present embodiment, is supplied with tap water from a water supply valve 23 and is connected to the drainage container 21 via a drainage valve 24. The aforementioned drainage container 24 has a plurality of drainage holes 22. Here, a case where the three drain holes 22a, 22b, and 22c are provided will be described in order to simplify the description. Here, the outer drain hole 22a is for cleaning the inner tank 5 and the outer tank 3, the central drain hole 22b is for cleaning the balancer 10, and the inner drain hole 22c is a drain hole for shower rinsing. The outer drain hole 22 a can be placed between the outer periphery of the inner tub 5 and the inner periphery of the outer tub 3, so that water can be applied to the outer peripheral portion of the inner tub 5 and the inner peripheral portion of the outer tub 3. The central drain hole 22 b can be poured on the balancer 10 by being arranged on the upper side of the balancer 10. By arranging the inner drain hole 22 c on the inner side of the inner periphery of the balancer 10, water can be sprayed on the clothing 19. Here, the opening / closing operations of the water supply / drainage valves 13, 23, 24 are the same as those in FIG. A plurality of drain containers 21 may be provided in the circumferential direction. In that case, each drain valve 24 may be provided and connected, or a plurality of drain containers 21 in the circumferential direction may be connected by a hose or the like.

  Further, as shown in FIG. 8, a drain hole 26 may be provided directly in the water storage container 25. Here, the arrangement and effects of the drain holes 26a, 26b, and 26c are the same as those of the drain holes 22a, 22b, and 22c in FIG. In this configuration, since the water storage container 25 does not have a drain valve, water is discharged from the drain holes 26a, 26b, and 26c as soon as the water supply valve 27 is opened and water is stored in the water storage container 25. Therefore, water can be stored in the water storage container 25 by setting the total area of the drain hole 26 so that the amount of water supplied from the water supply valve 27 is larger than the amount of water discharged from the drain holes 26a, 26b, and 26c. The water supply valve 27 is opened when dehydration is started, and the water supply valve 27 is closed when the outer tank 3 and the inner tank 5 pass through a rotational speed at which the outer tank 3 and the inner tank 5 integrally vibrate. When water is stored in 25 and the resonance rotational speed of the in-phase natural frequency is exceeded, the water in the water storage container 25 can be discharged.

  As shown in FIG. 7 and FIG. 8, in the structure in which the drainage from the water storage containers 20 and 25 enters the outer tub 3, the water supply path for storing water in the washing and rinsing process is made to pass through the water storage containers 20 and 25. By providing a water softening device in the water storage containers 20 and 25, it is possible to wash and rinse with soft water.

  <Embodiment 3> In this embodiment, when the water storage containers 28 and 29 which are water storage portions are provided above and below the outer tub 3 and pass through the rotational speed at which the outer tub 3 and the inner tub 5 vibrate together, the upper water storage An example of a method for moving the drainage of the container 28 to the lower water storage container 29 will be described with reference to FIG.

  As shown in FIG. 9, the specific structure of this embodiment is that water storage containers 28 and 29 for storing liquid are arranged on the upper and lower sides of the outer tub 3, and water is supplied to supply tap water to the upper water storage container 28. A drainage valve 31 for draining water from the valve 30 and the upper water storage container 28 and supplying water to the lower water storage container 29 via the hose 33 is provided, and drainage for discharging water from the lower water storage container 29 to the drainage hose 14. A valve 32 is provided.

  Next, an example of the opening / closing operation of each water supply / drainage valve after the start of the dehydration process will be described with reference to FIG. First, when the dehydration process is started, the water supply valve 30 is opened, and tap water is supplied into the upper water storage container 28. Next, when a predetermined time has elapsed, it is assumed that water has accumulated in the upper water storage container 28, the water supply valve 30 is closed, the drain valve 13 provided in the outer tub 3 is opened, and the inside of the outer tub 3 is connected via the drain hose 14. After draining water out of the machine, the inner tank 5 is rotated by the motor 8 to start centrifugal dehydration. At this time, the drain valve 13 provided in the outer tub 3 may be opened before the water is completely accumulated in the water storage container 28. Thereafter, when the rotational speed of the inner tank 5 is increased and reaches a predetermined rotational speed in the range of 300 r / min to 500 r / min, it is considered that the resonance of the in-phase natural frequency has passed, and the upper water storage container 28 The drain valve 31 is opened to move the water in the upper water storage container 28 to the lower water storage container 29 via the hose 33. Then, the rotational speed of the inner tank 5 is increased while moving the water, and the movement of the water in the upper water storage container 28 to the lower water storage container 29 is completed before reaching the maximum dehydration rotational speed. When the dehydration operation time is over, the motor 8 is braked and the inner tank 5 is stopped. At that time, the drain valve of the lower water storage container 29 is opened, and the water in the lower water storage container 29 is drained. When the dehydration process is completed, the drain valve 13 of the outer tub 3 and the drain valves 31 and 32 of the upper and lower water storage containers 28 and 29 are closed. In the above example, when water is stored in the water storage container 28, it is determined that the water supply valve 30 is stored in the open time. However, a sensor that detects the water level may be used.

  Thus, until the outer tub 3 and the inner tub 5 pass through the rotational speed at which they vibrate together, the upper weight of the outer tub 3 is increased more than usual so that the outer tub at the time of dehydration activation and at the time of passing through the resonant rotational speed. 3 vibration is suppressed. After that, by reducing the upper weight of the outer tub 3 and returning it to normal, by increasing the outer tub weight on the lower side of the outer tub, which has a small influence on the negative phase natural frequencies of the outer tub 3 and the inner tub 5, It is possible to suppress a large vibration of the outer tub 3 due to the reverse phase of the outer tub 3 and the inner tub 5 during high-speed rotation. The water supply / drain valves 13, 30, 31, and 32 are opened and closed by storing water in the upper water storage container 28 before resonance at the in-phase natural frequency and from the upper water storage container 28 to the lower water storage before the maximum rotational speed of dehydration. It suffices if water can move to the container 29, and a pump may be used instead of the valve for water supply / drainage to the upper water storage container 28.

  <Embodiment 4> In this embodiment, an example of a method in which an upper water storage container 34 and a lower water storage container 35, which are water storage units, are connected by a hose 38 and there is no movement of liquid other than the upper and lower water storage containers 34, 35. This will be described with reference to FIG. As shown in FIG. 11, the upper water storage container 34 is provided with a drainage valve 36 so that water can be moved to the lower water storage container 35 via the hose 38a, the lower water storage container 35 is provided with a pump 37, and the hose 38b is provided. Thus, water can be moved to the upper water storage container 34.

  Next, an example of the opening / closing operation of each water supply / drainage valve after the start of the dehydration process will be described with reference to FIG. First, when the dehydration process is started, the drain valve 13 provided in the outer tub 3 is opened, and the water in the outer tub 3 is drained out of the machine via the drain hose 14, and then the inner tub 5 is removed by the motor 8. Rotate to begin centrifugal dehydration. Thereafter, when the rotational speed of the inner tank 5 is increased and reaches a predetermined rotational speed in the range of 300 r / min to 500 r / min, it is considered that the resonance of the in-phase natural frequency has passed and the upper water storage container 34 The drain valve 36 is opened to move the water in the upper water storage container 34 to the lower water storage container 35 via the hose 38a. Next, the rotational speed of the inner tank 5 is increased while moving the water, and the movement of the water in the upper water storage container 34 to the lower water storage container 35 is completed before reaching the maximum dehydration rotational speed. When the dehydration operation time is over, the motor 8 is braked and the inner tank 5 is stopped. When the dehydration process is completed, the drain valve 13 of the outer tub 3 and the drain valve 36 of the upper water storage container 34 are closed. Then, for the next dehydration step, the pump 38 is operated to move the water in the lower water storage container 35 into the upper water storage container 34. Next, when a predetermined time has elapsed, it is considered that water has accumulated in the water storage container 34, and the pump 37 is stopped.

  Thus, until the outer tub 3 and the inner tub 5 pass through the rotational speed at which they vibrate together, the upper weight of the outer tub 3 is increased more than usual so that the outer tub at the time of dehydration activation and at the time of passing through the resonant rotational speed. 3, while reducing the upper side weight of the outer tub 3 and returning it to normal, the outer tub weight on the lower side of the outer tub 3 and the inner tub 5 has a small influence on the negative natural frequency. It is possible to suppress large vibration of the outer tub 3 due to the reverse phase of the outer tub 3 and the inner tub 5 during high-speed rotation. The water supply and drainage valves 13 and 36 are opened and closed by collecting water in the upper water storage container 34 before resonance at the in-phase natural frequency, and water from the upper water storage container 34 to the lower water storage container 35 before the maximum rotational speed of dehydration. Should be able to move. And the movement of the water from the lower side water storage container 35 to the upper side water storage container 34 may be not at the time of finishing the dehydration process but at the start of the dehydration process.

  <Embodiment 5> In this embodiment, an example of a structure that realizes an increase in weight on the upper side of the outer tub 3 and prevention of a decrease in the negative natural frequency of the outer tub 3 and the inner tub 5 by moving the weight up and down. This will be described with reference to FIG. The description of the basic operation of the washing machine, the configuration with the same reference numerals as those in FIG. 1, and the portions having the same functions will be omitted.

  As described above, the reverse-phase natural frequency at which the outer tub 3 and the inner tub 5 vibrate in the reverse phase is present at a position higher than the maximum dehydration rotational speed. In addition, it decreases when the upper side of the inner tub 5 becomes heavy, while it hardly decreases even when the lower side is heavy. That is, even if the weight of the bottom surface portion of the outer tub 3 or the inner tub 5 is increased, the reverse-phase natural frequency is unlikely to decrease. Therefore, as shown in FIG. 13, a weight 39 that can move up and down in the outer tub 3, a weight driving shaft 41 that moves the weight 39 up and down, and a weight driving motor 40 that drives the weight driving shaft 41. Is provided.

  Here, the movement operation of the weight 39 will be described with reference to FIG. The operations of the motor 8 and the drain valve 13 of the outer tub 3 are omitted because they are the same as those in FIG. Here, the case where the weight 39 is lowered by gravity when the weight driving motor 40 stops operating will be described. When the dehydration process is started, the weight driving motor 40 is operated to start moving the weight 39 located on the lower side of the outer tub to the upper side of the outer tub. When the movement is completed, the weight driving motor 40 is stopped and the weight is stopped. 39 is fixed to the upper side of the outer tub 3. Here, the determination of the completion of the movement of the weight 39 may be performed by the increase in the current of the weight driving motor 40 caused by the weight coming into contact with the upper stopper 42, or by using a micro switch or the like. The weight 39 can be fixed to the position of the upper stopper 42 by fitting the upper stopper 42 and the weight 39 and fixing them, or the weight driving motor 40 may have a brake. Next, the drain valve 13 provided in the outer tub 3 is opened, and the water in the outer tub 3 is drained to the outside through the drain hose 14, and then the inner tub 5 is rotated by the motor 8 to start centrifugal dehydration. . At this time, the drain valve 13 provided in the outer tub 3 may be opened before the weight 39 reaches the upper stopper 42. Thereafter, when the rotational speed of the inner tank 5 is increased and reaches a predetermined rotational speed in the range of 300 r / min to 500 r / min, it is considered that the resonance of the in-phase natural frequency has passed, and the weight driving motor 40 Is reversely rotated, and the weight 39 on the upper side of the outer tub 3 is moved downward. Here, when the weight 39 is fixed to the upper side by the brake of the weight driving motor 40, the power supply of the weight driving motor 40 may be stopped and the weight 39 may be lowered by gravity. Then, the rotational speed of the inner tub 5 is increased while moving the weight 39, and before reaching the maximum dehydration rotational speed, the weight 39 completes the movement to the lower stopper 43 and stops the weight driving motor 40. The weight 39 movement completion determination at this time is also performed in the same manner as in the upward movement. When the dehydration operation time is over, the motor 8 is braked and the inner tank 5 is stopped. When the dehydration process is completed, the drain valve 13 of the outer tub 3 is closed.

  Thus, until the outer tub 3 and the inner tub 5 pass through the rotational speed at which they vibrate together, the upper weight of the outer tub 3 is increased more than usual so that the outer tub at the time of dehydration activation and at the time of passing through the resonant rotational speed. 3, while reducing the upper side weight of the outer tub 3 and returning it to normal, the outer tub weight on the lower side of the outer tub 3 and the inner tub 5 has a small influence on the negative natural frequency. It is possible to suppress large vibration of the outer tub 3 due to the reverse phase of the outer tub 3 and the inner tub 5 during high-speed rotation.

  In the above-described embodiment, a washing machine having no drying function has been described. However, a vertical washing / drying machine using a heater or a fan may be used.

DESCRIPTION OF SYMBOLS 1 Outer frame 2 Vibration isolator 3 Outer tank 4 Rotor blade 5 Inner tank 5a Water passage hole 6 Flange 7 Deceleration mechanism 8 Motor 9 Mounting plate 10 Balancer 11 Washing shaft 12 Dewatering shaft 13 Drain valve 14 Drain hose 15 Water storage container 16 Water supply valve 17 Drainage valve 18 Vibration detection device 19 Clothing 20 Water storage container 21 Drainage container 22 Drainage hole 22a Outer drainage hole 22b Central drainage hole 22c Inner drainage hole 23 Water supply valve 24 Drainage valve 25 Water storage container 26 Drainage hole 26a Outer drainage hole 26b Central drainage hole 26c Inner drain hole 27 Water supply valve 28 Upper water storage container 29 Lower water storage container 30 Water supply valve 31 Drain valve 32 Drain valve 33a Hose 33b Hose 34 Upper water storage container 35 Lower water storage container 36 Drain valve 37 Pump 38a Hose 38b Hose 39 Weight 40 Weight drive motor 41 Weight drive shaft 42 Side stopper 43 lower stopper

Claims (5)

  An inner tub having rotating blades at the bottom; an outer tub containing the inner tub; an outer frame that houses the outer tub; and a vibration isolator that suspends and supports the outer tub on the outer frame. A washing machine for performing each of the rinsing and dehydrating steps, comprising a water storage section for storing liquid on an upper side of the outer tub, wherein the liquid in the water storage section is discharged during the dehydration process. In claim 1,
At the start of dehydration in the dehydration step, liquid is poured into the water storage unit, the rotation speed of the inner tank is increased, and after the rotation speed at which the outer tank and the inner tank vibrate together, the maximum dehydration rotation speed is reached. A washing machine characterized in that before reaching the liquid, the liquid is discharged from the water reservoir. In claim 1,
A water storage part for storing liquid is also provided on the lower side of the outer tub, and liquid is injected into the water storage part provided on the upper side of the outer tub at the start of dehydration during the dehydration process, thereby increasing the rotation speed of the inner tub. After the rotational speed at which the outer tank and the inner tank vibrate together, and before reaching the maximum dewatering rotational speed, the liquid in the water storage section provided above the outer tank is provided below the outer tank. A washing machine characterized in that it moves to a water storage section.   An inner tub having a rotating blade at the bottom, an outer tub containing the inner tub, an outer frame for housing the outer tub, and a vibration isolator for supporting the outer tub suspended from the outer frame, washing and rinsing And a washing machine for performing each step of dehydration, wherein the outer tub is provided with a weight capable of moving up and down. In claim 4,
The weight is placed on the upper side of the outer tub at the start of dehydration in the dehydration step, the rotational speed of the inner tub is increased, and the maximum dehydration is performed after exceeding the rotational speed at which the outer tub and the inner tub vibrate together. The washing machine is characterized in that the weight is moved downward before the rotational speed is reached.