JP2004016483A - Washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a washing machine which can efficiently transmit a rotation driving force generated by a motor to laundry through an agitator, and can suppress vibration that tries to occur at that time as much as possible. <P>SOLUTION: A control device for this washing machine is arranged on the bottom part of a water receiving tub which is elastically hung in an external box. An agitation cycle T3 by which an agitator is normally/reversely rotated is set to be 3 times a peculiar cycle T0 for a vibration system including the water receiving tub, when the agitator provided on the internal bottom part of a rotating tub is rotatably driven by the motor,. Then, an agitating time T1 of the agitator is set to be 2.5 times of the peculiar cycle T0. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a washing machine in which a rotating tub is provided in an outer tub elastically suspended on an outer box, and a stirring member provided in the rotating tub is rotationally driven by a motor provided at the bottom of the outer tub. About the machine.
[0002]
[Problems to be solved by the invention]
When the washing operation is performed in the washing machine, one of the control purposes is to improve the washing power by transmitting the driving force generated by the motor to the laundry. In order to achieve such a control purpose, conventionally, the maximum number of rotations and the rotation time of the motor have been controlled.
[0003]
However, at present, in a vertical washing machine, a rotating tub is provided in an outer tub elastically suspended in an outer box, and a stirring body provided in the rotating tub is provided at a bottom of the outer tub. The mainstream is a configuration driven by rotation. Then, since this structure forms a vibration system, when the motor rotates the stirring body, the driving force is transmitted and the outer tub elastically suspended vibrates. Therefore, it is difficult to efficiently transmit the driving force generated by the motor to the laundry simply by controlling the maximum number of rotations and the rotation time of the motor.
[0004]
In addition, since such a vibration system is configured, taking into account the noise reduction of the washing machine, the operation control includes how to suppress the vibration that is likely to occur in the washing machine when rotating the stirrer. There must be a purpose that is contrary to the above purpose. That is, it can be said that it is impossible to achieve this object at the same time only by the simple control described above.
[0005]
For example, Japanese Unexamined Patent Publication No. 9-56971 discloses that (1) the reversal cycle of the rotor is set to be 0.5 times or more and 2 times or less of the primary natural vibration cycle of the vibration system, so that the outer tub and the washing machine can be washed. There has been disclosed a technique in which the tub is intentionally vibrated greatly to promote the movement of the laundry in the washing tub, thereby improving the detergency. In the same publication, it is also proposed that (2) the reversal cycle of the rotor is set to be different from the above natural oscillation cycle to suppress the vibration of the entire washing machine.
[0006]
Considering this conventional technology, regarding (1), it is assumed that if the outer tub and the washing tub are vibrated greatly, the laundry in the washing tub will move greatly with water and the washing power will be improved. It seems to have assumed. However, in the washing machine having such a configuration, what wash the laundry in the washing tub should be a water flow generated by the rotating force of the rotating blades disposed at the bottom of the washing tub. In order for this water flow to be generated strongly, rotating the rotating blades while the washing tub is stationary as much as possible will increase the power transmitted to the water stored in the tub, and the water flow will not lose energy It is fair to think that it will occur.
[0007]
That is, according to the technique disclosed in Japanese Patent Application Laid-Open No. 9-56971, the laundry in the washing tub moves greatly, but the movement is a wasteful movement that impairs the original washing action, and the improvement of the washing power is hardly achieved. You can't hope for it.
[0008]
In addition, for (2), the mere reversal of (1) was described. However, in a general washing machine, even if the user is not particularly conscious of the design, the cycle of the rotor blade is at least somewhat equal to the natural oscillation period. Should be different. That is, (2) is substantially the same as the well-known technique, and it is apparent that the technique is not a technique that has a remarkable effect on the effect of “suppressing vibration”.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to efficiently transmit a rotational driving force generated by a motor to laundry via a stirrer and to reduce vibrations to be generated at that time. An object of the present invention is to provide a washing machine that can be suppressed as much as possible.
[0010]
[Means for Solving the Problems]
To achieve the above object, the washing machine according to claim 1 includes an outer tub elastically suspended in an outer box,
A rotating tank disposed in the outer tank;
A stirrer provided in the rotating tank;
A motor that is disposed at the bottom of the outer tank and that rotationally drives the stirrer,
The stirring period for inverting the stirring body is set to an integral multiple of the natural period of the vibration system including the outer tank.
[0011]
That is, if the stirring cycle is set in this manner, the vibration generated by the normal rotation of the stirring body acts so as to cancel out the torque generated when the stirring body next reversely rotates. Vibration of the vibration system can be suppressed well. In addition, as a result of suppressing the vibration of the vibration system, the efficiency of the driving force transmitted to the stirrer is maximized and the relative displacement is increased, so that the stirrer can generate a stronger water flow, and the cleaning can be performed. Strength can be improved.
[0012]
In this case, it is preferable that the natural period of the vibration system including the outer tub is estimated according to the capacity of the laundry, and the stirring period is set. That is, the natural period of the vibration system changes depending on the amount of laundry (cloth amount) put into the rotating bed and the amount of water stored accordingly. Therefore, if the cloth amount can be detected, the natural period can be estimated from the cloth amount, and the stirring period can be appropriately set based on the estimated natural period.
[0013]
Further, as described in claim 3, a vibration sensor for detecting the magnitude of vibration in which the outer tank vibrates in the rotation direction of the stirring body,
The stirring cycle may be set based on the detection output of the vibration sensor. That is, based on the detection output of the vibration sensor, it is possible to directly grasp the actual vibration state of the vibration system that changes in accordance with the amount of cloth, etc., so that the stirring period is appropriately set based on the vibration state. be able to.
[0014]
The washing machine according to claim 4, wherein the outer tub is elastically suspended in the outer box,
A rotating tank disposed in the outer tank;
A stirrer provided in the rotating tank;
A motor that is disposed at the bottom of the outer tank and that rotationally drives the stirrer,
The stirring time of the stirrer is set to a ratio obtained by oddly multiplying a half of a natural period of a vibration system including the vibration system including the outer tank.
That is, if the stirring time is set in this manner, the vibration generated by the normal rotation of the stirring body cannot be canceled by the torque generated when the stirring body next reversely rotates, so the rotation of the stirring body is stopped. In this case, the vibration of the vibration system increases. Then, the outer tub and the rotary tub vibrate and largely displace with respect to the stopped stirring body, so that the laundry that is displaced according to the relative displacement between them also moves more. Therefore, it is possible to prevent the stirrer and the laundry from entangled with the cloth.
[0015]
In this case, as described in claim 5, the natural period of the vibration system including the outer tub may be estimated according to the capacity of the laundry, and the stirring time may be set. With such a configuration, the same effect as that of the second aspect can be obtained for the configuration of the fourth aspect.
[0016]
Further, as described in claim 6, the outer tank is provided with a vibration sensor for detecting the magnitude of vibration vibrating in the rotation direction of the stirring body,
The stirring time may be set based on the detection output of the vibration sensor. With such a configuration, the same effect as that of the third aspect can be obtained for the configuration of the fourth aspect.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
(First embodiment)
Hereinafter, a first embodiment in a case where the present invention is applied to a fully automatic dehydrating and washing machine will be described with reference to FIGS. First, FIG. 2 shows the entire configuration of the washing machine with both dehydration according to the present embodiment. The washing machine main body 1 includes a rectangular box-shaped outer box 2 and a hollow top cover 3 provided on the upper surface of the outer box 2. A water receiving tank 4 as an outer tank is elastically suspended by an elastic suspension mechanism 5 inside the outer box 2, and a rotating tub 6 serving as a dehydrating tank and a washing tub is rotatably arranged inside the water receiving tank 4. Is established.
[0018]
A large number of dehydration holes 6a are formed in the peripheral wall of the rotary tub 6. Further, a balance ring is provided at the upper end of the rotary tank 6. Further, an agitator 8 is rotatably disposed at the inner bottom of the rotary tank 6.
[0019]
A drive mechanism 9 is disposed below the water receiving tank 4 in the outer box 2. The drive mechanism 9 includes a washing machine motor 10 including a direct drive type outer rotor type brushless motor, a clutch mechanism (not shown), and the like. A stator 10a of the washing machine motor 10 is attached to the water receiving tub 4 via a drive mechanism base 9a, and a rotor 10b is directly connected to the stirring body 8. During the washing step and the rinsing step, only the agitator 8 is rotated forward and reverse by the washing machine motor 10, and the agitator 8 and the rotary tub 6 are rotated at a high speed in synchronization with the dehydration step. I have.
The water receiving tank 4, the elastic suspension mechanism 5, the rotating tank 6, and the drive mechanism 9 constitute a vibration system 100.
[0020]
A drain port 11 is formed at the bottom of the water receiving tank 4. A drain hose 13 is connected to the drain port 11 via a drain valve 12. Further, an air trap 14 is provided in the drain port 11. The pressure of the air trap 14 is configured to be guided to a water level sensor 16 (see FIG. 3) via an air tube 15. The water level sensor 16 detects the water level in the water receiving tank 4 (rotary tank 6) as is well known, and is disposed inside the top cover 3.
[0021]
The top cover 3 is provided with a lid 17. An operation panel 18 is provided on the front upper surface of the top cover 3, and a control device 19 is provided on the back side thereof.
[0022]
In FIG. 3 showing the electrical configuration, the control device 19 is composed of a circuit mainly composed of a microcomputer, and stores a control program for controlling overall washing. The control device 19 detects the rotation state of the motor 10 by using a position detecting element, for example, a Hall IC 10c, provided in the washing machine motor 10 for detecting the rotor position.
[0023]
The control device 19 receives a switch signal from various switches 20 provided on the operation panel 18, a water level detection signal from the water level sensor 16, and a rotor magnetic pole detection signal from the Hall IC 10c. I have. Further, the control device 19 controls the drain valve 12 and the water supply valve 22 via a drive circuit 21, further controls the washing machine motor 10 via a motor drive circuit 23, and further displays various displays 24 ( This is also provided on the operation panel 18). The motor drive circuit 23 includes an inverter circuit, a PWM circuit, and the like, and is configured to drive and control the washing machine motor 10 by PWM control. Further, the water supply valve 22 is provided inside the rear part of the top cover 3 shown in FIG. 2, and the water supply valve 22 supplies water into the rotary tank 6.
[0024]
The control device 19 determines the amount (cloth amount) of the designated laundry as follows. First, the washing machine motor 10 is energized for a predetermined time in a predetermined energizing mode in a state where there is no water in the rotating tub 6 to cut off the power. The output signal (pulse) from the Hall IC 10c is counted from the start of the rotation to the stop of the inertial rotation due to the power failure, and it is determined that the larger the count value, the smaller the cloth amount.
[0025]
Next, the operation of the present embodiment will be described with reference to FIGS. 1 and 4 to 8. The motor drive control at the time of washing of the control device 19 is such that the motor 10, that is, the stirrer 8 is rotated forward and stopped, as shown in FIG. The energization control is performed so that the inversion and the pause are repeated. FIG. 1B shows the torque generated with the rotation.
[0026]
In this case, the control device 19 sets the stirring time T1 for rotating the stirring body 8 in the normal direction and the reverse direction, and the stirring period T3 which is the sum of the stirring time T1 and the pause time T2 according to the natural period T0 of the vibration system 100. I do. That is,
T1 = (T0 / 2) × (2m + 1), (m = 1, 2, 3,...)
T3 = T0 × n, (n = 2, 3,...)
And For example, if T0 = 0.62, m = 2, n = 3,
T1 = (0.62 / 2) × 5 = 1.55 (second)
T3 = 0.62 × 3 = 1.86 (second)
It becomes.
[0027]
This is determined based on the following principle. FIG. 5 shows the starting acceleration generated in the vibration system 100 (water receiving tank 4) when the stirring period of the stirring body 8 is changed. In this case, the natural period T0 of the vibration system 100 is approximately 0.62 seconds. In 3T0 and 4T0, which are integral multiples of the natural period T0, the curves indicating the starting acceleration form a valley. In the meantime, in the 2.5T0, 3.5T0, and 4.5T0 between the curves, the curves show peaks. Has formed.
Based on this result, the stirring time T1 was set to 2.5T0 corresponding to the peak, and the stirring cycle T3 was set to 3T0 corresponding to the valley.
[0028]
That is, with respect to the stirring cycle T3, by setting as described above, the vibration generated by the forward rotation of the stirring body 8 acts so as to cancel the torque generated in the next reverse rotation. Therefore, the vibration of the vibration system 100 at the time of starting the stirring body 8 can be favorably suppressed. In addition, as a result of the suppression of the vibration of the vibration system 100, the transmission efficiency of the driving force of the motor 10 to the stirring body 8 is maximized and the relative displacement is increased. It is possible to generate a natural water flow. As a result, the cleaning power is improved.
[0029]
FIG. 6 shows the results of measuring the cloth rotation average angle when the stirring cycle T3 was set to 2.5T0 and 3T0, respectively, for the cloth load immediately after dehydration. Here, the cloth rotation average angle is the angle at which the cloth in the rotating layer 6 rotates when the stirring body 8 makes one rotation. In this case, when T3 = 3T0, the cloth rotation average angle is larger, indicating that the cloth is moving more. That is, the measurement result supports that the transmission efficiency of the driving force of the motor 10 to the stirring body 8 is increased by suppressing the vibration of the vibration system 100 as described above.
[0030]
FIG. 7 shows that when the stirring period T3 is set to 3T0 = 1.86 (second), the stirring time T1 is set to 1.5T0 = 0.93 (second) and 2T0 = 1.24 (second), respectively. It is the result of having measured the cloth entanglement rate in the case of doing. When the amount of water was 40 L with a 4 kg cloth, the measurement was performed at the end of the washing operation. Here, the cloth entanglement rate A is defined as follows.
A (%) = (B−C) / C × 100
Here, C is the take-out time (second) of the laundry when the laundry is not entangled, and B is the take-out time (second) of the laundry at the end of the laundry.
[0031]
That is, as is clear from FIG. 7, the entanglement ratio is lower when T1 = 1.5T0. This is considered as follows. When the stirring time T1 is set in this manner, the vibration of the vibration system 100 when the rotation of the stirring body 8 is stopped increases, but the water receiving tank 4 and the rotating tank 6 vibrate relative to the stopped stirring body 8 and increase. Due to the displacement, the laundry that is displaced according to the relative displacement between the two also moves more. Therefore, the stirrer 8 and the laundry are prevented from being entangled with the cloth.
[0032]
Based on the above principle, the control device 19 sets the stirring time T1 to 2.5T0 and the stirring cycle T3 to 3T0. Note that the actual natural period T0 of the vibration system 100 changes according to the amount of laundry put into the rotating tub 6 by the user and the amount of water injected and stored in the rotating tub 6 accordingly. Accordingly, when estimating the amount of laundry input as described above for each washing operation, the control device 19 estimates the natural period T0 based on the table shown in FIG. 4 and sets the stirring time T1 and the stirring period T3. .
[0033]
FIG. 8 shows the rotational speed of the stirrer 8 observed after setting the stirring time T1 and the stirring cycle T3 as described above (however, the direction is not distinguished), and the acceleration of the vibration system 100. It shows a waveform. As is clear from this figure, the vibration at the time of starting the stirring body 8 is small and the vibration at the time of stopping the stirring body 8 is large, and the intended control is performed.
[0034]
As described above, according to the present embodiment, the control device 19 of the washing machine is provided at the bottom of the water receiving tub 4 elastically suspended on the outer box 2 and provided at the inner bottom of the rotating tub 6. When the motor 8 is driven to rotate by the motor 10, the stirring period T3 for reversing the stirring body 8 in the forward and reverse directions is set to be three times the natural period T0 of the vibration system 100 including the water receiving tank 4. Therefore, the vibration of the vibration system 100 at the time of starting the stirring body 8 can be favorably suppressed. Further, as a result of the suppression of the vibration of the vibration system 100, the efficiency of the driving force transmitted to the stirring body 8 is maximized and the relative displacement is increased, so that the stirring body 8 can generate a stronger water flow. And the detergency can be improved.
[0035]
Further, since the control device 19 sets the stirring time T1 of the stirring member 8 to 2.5 times the natural period T0, the vibration of the vibration system 100 when the rotation of the stirring member 8 is stopped increases, and As the relative displacement increases, the laundry also moves more. Therefore, it is possible to prevent the stirrer 8 and the laundry from entangled with the cloth.
[0036]
In this case, the natural period T0 of the vibration system 100 including the water receiving tub 4 is estimated based on the data table according to the detected laundry capacity, and the stirring period T3 and the stirring time T1 are set. The stirring period can be appropriately set based on the natural period T0 estimated from the above.
[0037]
(Second embodiment)
FIGS. 9 to 11 show a second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Only different parts will be described below. In the second embodiment, a vibration sensor 25 for detecting the vibration of the water receiving tank 4 is attached to the water receiving tank 4 as shown in FIG. The control device 26 instead of the control device 19 directly detects the vibration of the water receiving tank 4 (vibration system 100) by referring to the output signal of the vibration sensor 25, and the stirring time T1 and the stirring period T3 are optimized according to the result. Adjust the amount to be.
[0038]
FIG. 10 is a flowchart showing the control contents when the control device 26 adjusts the stirring cycle and the stirring time. Note that a variable of the stirring period is Tx and a variable of the stirring time is Ty (see FIG. 11). The control device 26 first sets initial values T11 and T12 for the stirring cycle Tx and the stirring time Ty, respectively (step S1). Then, when driving the stirrer 8, the vibration value A1 generated at the time of starting and the vibration value A2 generated at the time of stopping are measured respectively (steps S2 and S3).
[0039]
Next, the control device 26 adds the time increment ΔT11 to the stirring cycle Tx and the stirring time Ty, respectively.
, ΔT12 (step S4), the next time, the stirring body 8 is driven by the stirring period Tx and the stirring time Ty, and the vibration value B1 generated at the time of starting is measured (step S5). Then, the vibration value A1 measured last time is compared with the vibration value B1 measured this time (step S6). If the latter is smaller than the former ("YES"), a time increment ΔT11 is further added to the stirring cycle Tx (step S6). S7). If the latter is equal to or greater than the former ("NO"), the time increment ΔT11 is subtracted from the stirring cycle Tx (step S8).
[0040]
Subsequently, the control device 26 measures a vibration value B2 generated when the stirrer 8 is stopped (Step S9). Then, the vibration value A2 measured last time is compared with the vibration value B2 measured this time (step S10), and when the latter is larger than the former ("YES"), a time increment ΔT12 is further added to the stirring time Ty (step S10). S11). If the latter is equal to or less than the former ("NO"), the time increment ΔT12 is subtracted from the stirring time Ty (step S12). Then, when the value B1 is assigned to the value A1 and the value B2 is assigned to the value A2 (step S13), the process proceeds to step S5.
[0041]
By repeatedly performing the above control, the stirring cycle Tx is adjusted so that the vibration generated in the vibration system 100 when the stirring body 8 is started is minimized, and the stirring time Ty is set when the stirring body 8 is stopped. 100 is adjusted so as to maximize the vibration generated.
[0042]
As described above, according to the second embodiment, the water receiving tank 4 is provided with the vibration sensor 25 for detecting the magnitude of the vibration that vibrates in the rotation direction of the stirring body 8, and the control device 26 outputs the detection output of the vibration sensor 25. The stirring period Tx and the stirring time Ty are set on the basis of the above, so that the stirring period Tx and the stirring time Ty are set according to the actual vibration state of the vibration system 100 which changes according to the amount of cloth put into the rotary tank 6 and the like. Can be set appropriately.
[0043]
(Third embodiment)
FIG. 12 shows a third embodiment in which the present invention is applied to a vertical washing / drying machine, and is a side view showing a schematic configuration of the entire washing / drying machine, partially cut away. The housing 31 forming the outer shell is composed of a rectangular outer box 32 and a top cover 33 attached to an upper portion thereof. Among them, the top cover 33 has a flat container shape with a reduced height dimension (vertical direction), and has a loading port 33a at a substantially central portion for taking in and out laundry, and a lid 34 for opening and closing the loading port 33a. I have it.
[0044]
Further, inside the outer box 32, a bottomed cylindrical water tank 36 which is openable at the upper surface and is capable of storing water is elastically supported via elastic support mechanisms 37 at four corners (only one is shown in FIG. 12). I have. A drain port 36a is formed at the lowest portion of the bottom of the water tank 36, and a drain pipe 39 is connected through a drain valve 38 so that the water can be drained outside the machine. A disc-shaped tank cover 40 is fitted and fixed to the opening on the upper surface of the water tank 36 so as to close it, and an inner lid 40a is provided on the upper surface of the water tank 36 so as to be openable and closable near the front. The laundry can be taken in and out facing each other. Therefore, when the inner lid 40a is in the closed state, the upper end opening of the water tank 36 is concealed by the tank cover 40, and the inside is kept substantially closed.
[0045]
A rotating tub 41 for storing laundry is provided inside the water tub 36 so as to be rotatable around a vertical axis. Specifically, it has a so-called vertical bottomed cylindrical shape that opens on the same top surface as the water tank 36 and rotates around a vertical axis, and has many through holes 41a on the entire peripheral wall including the bottom. Is provided with a balance ring 41b. A dish-shaped stirring body 42 having a large diameter and a large area is provided on the inner bottom thereof so as to be rotatable forward and backward.
[0046]
A hollow shaft 43 is connected to the center of the bottom of the rotary tank 41, and a rotary shaft 44 connected to the agitator 42 is inserted and supported at the upper end inside the hollow shaft 43. Reference numeral 44 is configured to be selectively rotated by a driving motor 45 mounted on the outer bottom of the water tank 36 via a clutch mechanism (not shown). The drive control is performed by the control device 19 or 26 in the first or second embodiment.
[0047]
The casing 31 is provided with a circulation path 46 that communicates with the inside of the water tank 36 at the upper and lower portions thereof and that sucks and discharges warm air to and from the water tank 36. Attachment means (not shown) is attached and fixed to an appropriate stationary part on the outer box 32 side of the housing 31. Specifically, the circulation path 46 has a lower end serving as one end directly communicating with the vicinity of the drain port 36 a at the bottom of the water tank 36, and an upper end serving as the other end communicating with the upper part of the water tank 36 via the inside of the top cover 33. In contrast to 36, the lower end functions as a suction duct 46a for warm air (exhaust air), and the upper end functions as a new warm air blowing duct 46b.
[0048]
Each of the suction duct 46a and the blowing duct 46b has a flexible bellows shape and is elastically connected to and supported by the water tank 36. Specifically, the upper blowing duct 46b is connected to the tank cover. Vibration transmission from the water tank 36 side is suppressed in these two ducts 46a and 46b in a buffer manner, and vibration transmission to the outer case 42 side through the circulation path 46 is carried out. Has been reduced.
[0049]
In such a circulation path 46, a heater 47, a blower fan 48, and the like are provided so that warm air circulates in the direction of arrow A in the figure with respect to the water tank 36. In addition, a water injection section 49 for injecting cooling water for dehumidification, a filter 50 for collecting fiber waste, and the like are arranged in a middle portion of the circulation path 46.
[0050]
In the washing / drying machine having such a configuration, when the vibration system 51 including the water tub 36 vibrates, the vibration is applied to the bellows-like ducts 46a and 46b. May be partially broken. Therefore, if the present invention is applied to this washing and drying machine, unnecessary vibration can be suppressed as much as possible, and the life of the ducts 46a and 46b can be extended.
[0051]
The present invention is not limited to the embodiment described above and shown in the drawings, and the following modifications or extensions are possible.
The control for setting the stirring cycle to suppress the vibration of the vibration system 100 when the stirring body 8 is activated and the control for setting the stirring time to further increase the vibration of the vibration system 100 when the stirring body 8 is stopped are either Only one may be performed.
In a washing machine having a drying function, the same control may be performed during the drying operation.
The specific numerical values are merely examples, and may be changed appropriately according to individual designs.
[0052]
【The invention's effect】
According to the washing machine of the first aspect, the stirring period for inverting the stirrer is set to an integral multiple of the natural period of the vibration system including the outer tub. In this case, the torque generated when the agitator rotates in the next reverse direction acts to cancel. Therefore, the vibration of the vibration system at the time of starting the stirring body can be favorably suppressed. In addition, as a result of suppressing the vibration of the vibration system, the efficiency of the driving force transmitted to the stirrer is maximized and the relative displacement is increased, so that the stirrer can generate a stronger water flow, and the cleaning can be performed. Strength can be improved.
[0053]
According to the fourth aspect of the present invention, the stirring time of the stirring body is set to a ratio obtained by oddly multiplying a half of the natural period of the vibration system including the outer tub. The vibrating vibration cannot be canceled by the torque generated when the stirring body rotates in the next reverse direction, and the vibration of the vibration system increases when the rotation of the stirring body stops. Therefore, when the outer tub and the rotary tub vibrate and largely displace with respect to the stopped stirring body, the laundry that is displaced in accordance with the relative displacement between the outer tub and the rotating tub also moves more. Can be prevented from entangled with the cloth.
[Brief description of the drawings]
FIG. 1 is a first embodiment in which the present invention is applied to a fully automatic dehydrating / washing machine. FIG. 1 (a) is an energization waveform diagram of a washing machine motor, and FIG. 1 (b) is generated as the washing machine motor rotates. Diagram showing the torque waveform
FIG. 2 is a diagram showing an entire configuration of a washing machine for both dehydration and use.
FIG. 3 is a functional block diagram showing an electrical configuration.
FIG. 4 is a diagram showing a table held by the control device.
FIG. 5 is a diagram showing a starting acceleration generated in a vibration system (water receiving tank) when a stirring period of a stirring body is changed.
FIG. 6 is a diagram showing a measurement result of a cloth rotation average angle when a stirring cycle T3 is set to 2.5T0 and 3T0, respectively, for a cloth load in a state immediately after dehydration.
FIG. 7 is a view showing the measurement results of the entanglement ratio when the stirring period T3 is set to 3T0 and the stirring time T1 is set to 1.5T0 and 2T0, respectively.
FIG. 8 is a diagram showing the rotation speed of the stirrer and the acceleration waveform of the vibration system observed after setting the stirring time T1 and the stirring period T3 as described above.
FIG. 9 is a view corresponding to FIG. 3, showing a second embodiment of the present invention.
FIG. 10 is a flowchart showing control contents for adjusting a stirring cycle and a stirring time by a control device.
FIG. 11 is a diagram corresponding to FIG. 1;
FIG. 12 is a view corresponding to FIG. 1, showing a third embodiment in which the present invention is applied to a vertical washing and drying machine;
[Explanation of symbols]
4 is a water receiving tank (outer tank), 5 is an elastic suspension mechanism, 6 is a rotating tank, 8 is a stirring body, 10 is a washing machine motor, 19 and 26 are control devices, 36 is a water receiving tank (outer tank), 37 is An elastic suspension mechanism, 41 is a rotary tub, 42 is a stirring body, 45 is a washing machine motor, and 51 and 100 are vibration systems.

Claims (6)

An outer tank elastically suspended in an outer box,
A rotating tank disposed in the outer tank;
A stirrer provided in the rotating tank;
A motor that is disposed at the bottom of the outer tank and that rotationally drives the stirrer,
A washing machine characterized in that a stirring cycle for inverting the stirring body is set to an integral multiple of a natural cycle of a vibration system including the outer tub. The washing machine according to claim 1, wherein a natural period of the vibration system including the outer tub is estimated according to a capacity of the laundry, and a stirring period is set. The outer tank includes a vibration sensor for detecting the magnitude of vibration that vibrates in the rotation direction of the stirrer,
The washing machine according to claim 1, wherein a stirring cycle is set based on a detection output of the vibration sensor. An outer tank elastically suspended in an outer box,
A rotating tank disposed in the outer tank;
A stirrer provided in the rotating tank;
A motor that is disposed at the bottom of the outer tank and that rotationally drives the stirrer,
A washing machine wherein the stirring time of the stirring body is set to a ratio obtained by oddly multiplying a half of a natural period of the vibration system including the outer tub. The washing machine according to claim 4, wherein a natural period of the vibration system including the outer tub is estimated according to a capacity of the laundry, and a stirring time is set. The outer tank includes a vibration sensor for detecting the magnitude of vibration that vibrates in the rotation direction of the stirrer,
The washing machine according to claim 4, wherein the stirring time is set based on a detection output of the vibration sensor.

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