JP2020188970A - Drum type washing machine - Google Patents

Abstract

To control so that product vibration does not increase during dewatering, even when a floor situation is changed.SOLUTION: A drum type washing machine includes: a water tub 3 formed in a bottomed cylindrical chape; a bottomed cylindrical rotary drum 4 disposed in the water tub 3 in a rotatable manner; a motor 5 for rotationally driving the rotary drum 4; an outer case 1 for elastically supporting a vibration system water tub unit 2 comprising the rotary drum 4, the water tub 3, the motor 5 and the like so as to oscillate; rotational frequency detection means 24 for detecting the rotational frequency of the rotary drum 4 for detecting the rotational frequency of the motor 5 and connecting; water tub vibration detection means 41 for detecting the vibration of the water tub unit 2 provided at the water tub 3; and outer case vibration detection means 42 for detecting the vibration of the outer case 1. In a dewatering step, the rotational frequency of the rotary drum 4 is made to be the final target dewatering rotational frequency in which the vibration of the outer case 1 in a rotational frequency region becomes the minimum during a normal dewatering rotation detected by the outer case vibration detection means 42 for detecting the vibration of the outer case 1. With this constitution, low vibration and low noise can be achieved.SELECTED DRAWING: Figure 1

Description

The present invention relates to a drum type washing machine.

Conventionally, this type of drum-type washing machine grasps the presence or absence of an unbalanced abnormality caused by the bias of the laundry contained in the rotating drum during dehydration by detecting the vibration of the vibration system. A control method for controlling the process of the above has been proposed (see, for example, Patent Document 1).

FIG. 5 is a vertical cross-sectional view of the conventional drum-type washing machine described in Patent Document 1.

In FIG. 5, the water tank 120 rotatably containing the rotating drum 121 accommodating the laundry is suspended from the outer box 118 by the spring body 126, and this vibration is transmitted to the outer box 118 by the anti-vibration damper 127. It is vibration-proof and supported so that it will not be used. In addition, a weight 128 for suppressing the vibration of the water tank 120 is also provided.

Further, the water tank 120, which is a vibration system, is provided with a vibration detecting means 130 for detecting the vibration amplitude of the water tank 120 by using an acceleration sensor. Then, in response to the signal from the vibration detecting means 130, the control device 131 controls the motor 124 to change the rotation speed of the rotating drum 121 and the like to control the dehydration stroke.

Japanese Unexamined Patent Publication No. 6-23890

However, in the conventional configuration, the vibration of the water tank is detected to control the rotation of the rotating drum, but the user recognizes the vibration of the product due to the vibration of the outer box appearing on the outside and the vibration thereof. It's noise.

The vibration of the outer box is greatly affected by the strength of the floor on which the washing machine is installed. That is, since the outer box of the washing machine is elastically supported by the ground through the floor of the building, the vibration of the outer box is also affected by the strength of the floor.

For example, in the case of a soft floor with low floor strength, the natural frequency of the outer box including the floor is lower than that of a normal strength floor, that is, a hard floor, so that the rotation drum range is low. On a hard floor, the vibration of the outer box is not so noticeable, but on a soft floor, the vibration of the outer box is unexpectedly large, causing dissatisfaction among users and leading to complaints. ..

The present invention solves the above-mentioned conventional problems, and secures dehydration performance by controlling the rotation of a rotating drum so as to change the final target dehydration rotation speed according to the floor surface condition and controlling the stroke. At the same time, it is an object of the present invention to provide a drum type washing machine that realizes low vibration and low noise.

In order to solve the above-mentioned conventional problems, the drum-type washing machine of the present invention includes a water tank formed in a bottomed cylindrical shape, a bottomed cylindrical rotating drum rotatably arranged in the water tank, and the like. The rotation that detects and connects the rotation speed of the motor to the motor that rotationally drives the rotary drum and the outer box that elastically supports the vibration system water tank unit including the rotary drum, the water tank, the motor, and the like. Various information such as a rotation speed detecting means for detecting the rotation speed of the drum, a water tank vibration detecting means for detecting the vibration of the water tank unit provided in the water tank, and an outer box vibration detecting means for detecting the vibration of the outer box. The storage means for storing and the control means for controlling each process such as washing, rinsing, and dehydration by controlling the motor and the like are provided, and the control means is detected by the outer box vibration detecting means in the dehydration process. The rotation speed of the rotating drum when the vibration of the outer box in the rotation speed region during the steady dehydration rotation is minimized is set as the final target dehydration rotation speed.

As a result, it is possible to realize low vibration and low noise while ensuring dehydration performance.

The drum-type washing machine of the present invention controls the rotation of the rotating drum so as to change the final target dehydration rotation speed according to the floor surface condition, and realizes low vibration and low noise while ensuring dehydration performance. be able to.

Longitudinal sectional view of the drum type washing machine according to the first embodiment of the present invention. Block circuit diagram of the drum type washing machine Flow chart of dehydration process of the drum type washing machine Graph diagram showing the relationship between the rotating drum rotation speed of the drum type washing machine and the outer box amplitude Longitudinal section of a conventional drum-type washing machine

The first invention comprises a water tank formed in a bottomed cylindrical shape, a bottomed cylindrical rotating drum rotatably arranged in the water tank, a motor for rotationally driving the rotating drum, and the rotating drum. An outer box that elastically supports a vibrating water tank unit including a water tank, a motor, etc., and a rotation speed detecting means for detecting the rotation speed of the rotating drum that detects and connects the rotation speed of the motor. By controlling the water tank vibration detecting means for detecting the vibration of the water tank unit provided in the water tank, the outer box vibration detecting means for detecting the vibration of the outer box, the storage means for storing various information, the motor and the like. The control means is provided with a control means for controlling each process such as washing, rinsing, and dehydration. In the dehydration process, the outer box vibration in the rotation speed region during the steady dehydration rotation detected by the outer box vibration detecting means is generated. By setting the rotation speed of the rotating drum at the minimum to the final target dehydration rotation speed, it is possible to realize low vibration and low noise.

In the second invention, in particular, the control means of the first invention stores the rotation speed of the rotating drum when the outer box vibration detected by the outer box vibration detecting means is minimized in the dehydration stroke. It is possible to realize low vibration and low noise by making the configuration in which the rotation speed memorized from the next dehydration is used as the final target dehydration rotation speed.

The third invention particularly applies the control means of the first or second invention to the final target dehydration rotation speed when the final target dehydration rotation speed of the rotating drum is lower than the maximum reached dehydration rotation speed in the dehydration stroke. According to the above, by extending the dehydration time, it is possible to realize low vibration and low noise while ensuring dehydration performance.

Hereinafter, embodiments of the invention will be described with reference to the drawings. The present invention is not limited to this embodiment.

(Embodiment 1)
FIG. 1 is a vertical cross-sectional view of the drum-type washing machine according to the first embodiment of the present invention, and FIG. 2 is a block circuit diagram of the drum-type washing machine.

In FIG. 1, the water tank unit 2 rotatably stores a rotary drum 4 formed in a bottomed cylindrical shape in the water tank 3, and the axial direction is horizontal or horizontal toward the back surface side which is the bottom of the rotary drum 4. A rotary shaft 7 that is inclined downward from the ground is supported by a bearing 6 provided on the back surface of the water tank 3, and a motor 5 for driving a rotary drum is connected to the rotary shaft 7.

As described above, the water tank unit 2 is a vibration system composed of a rotating drum 4, a water tank 3, a motor 5, etc., but the axis is arranged so as to be inclined in the outer box 1 of the washing machine, and the outer box is arranged. The weight is supported by the anti-vibration damper 10 attached between the base portion 8 of 1 and the support plate 9 provided on the lower surface portion of the water tank 3, and further, the upper support metal fitting 11 fixed to the upper part of the water tank 3 The vibration-proof spring 12 provided between the outer box 1 and the upper surface swings and elastically supports the vibration-proof.

Further, a closed annular fluid balancer 38 in which a fluid is sealed is disposed on the front peripheral edge of the rotating drum 4 for vibration reduction.

The door body 39 is pivotally supported on the front inclined surface of the outer box 1 so that the door body 39 can be opened and closed, and the user opens the door body 39 and enters the rotating drum 4 from the front inclined opening 40 provided on the front inclined surface. Put the laundry clothes in the direction.

A water supply valve 14 is provided in the inner upper part of the outer box 1 to communicate with the water tank 3 and control the water supply in the water tank 3 and the rotary drum 4, and the water tank 3 is provided in the inner lower part of the outer box 1. A drain valve 13 is provided to communicate and control the drainage of water in the water tank 3 and the rotary drum 4.

Further, on the inner lower surface of the outer box 1, a control means 20 (see FIG. 2) that controls a motor 5, a water supply valve 14, a drain valve 13, and the like to control a series of processes such as washing, rinsing, and dehydration is provided. The control device 45 having the control device 45 is arranged.

The mode and various functions such as the driving course are selected by the user from the input setting means 21 (see FIG. 2) of the operation display unit 44 arranged above the door body 39, and the control means 20 inputs the input. Based on the information, it is displayed by the display means 35 (see FIG. 2) to notify the user.

Further, the motor 5 is provided with a rotation speed detecting means 24 for detecting the rotation speed of the rotating drum 4 by detecting the rotation speed of the motor 5.

A water tank vibration detecting means 41 for detecting the vibration of the water tank unit 2 is provided in the upper part of the water tank 3, and an outer box vibration detecting means 42 for detecting the vibration of the outer box 1 is provided in the upper part of the outer box 1. Has been done.

In addition, this drum-type washing machine has a drying function provided with a blower fan 17 (see FIG. 2) for blowing warm air and a heater 18 (see FIG. 2) for generating warm air in the rotating drum 4, and a water tank. It has a hot water function provided with a heating device 19 (see FIG. 2) for warming the washing water in 3.

In FIG. 2, the control device 45 rectifies the AC power 31 by the commutator 32, and rotates the motor 5 by the inverter circuit 26 using the DC power smoothed by the smoothing circuit including the choke coil 33 and the smoothing capacitor 34 as the driving power. At the same time as driving, the rotation of the motor 5 is controlled based on the operation instruction input from the input setting means 21 and the monitoring information of the operating state detected by each detecting means, and the load driving means 37 controls the water supply valve 14 and the drain valve 13. , Blower fan 17, heater 18, heating device 19 and the like are controlled.

The motor 5 is configured as a DC brushless motor including a stator having three-phase windings 5a, 5b, and 5c and a rotor having two-pole permanent magnets, and three position detection elements 24a, 24b, and 24c. The rotation is controlled by the PWM control inverter circuit 26 composed of the switching elements 26a to 26f.

The rotor position detection signals detected by the position detection elements 24a, 24b, and 24c are input to the control means 20, and the drive circuit 25 PWM-controls the on / off states of the switching elements 26a to 26f based on the rotor position detection signals. By controlling the energization of the three-phase windings 5a, 5b, and 5c of the stator, the rotor is rotated at the required rotation speed.

The control means 20 detects the cycle each time the state of any of the signals of the three position detecting means 24a, 24b, and 24c changes, and the rotation speed detecting means 24 calculates the rotation speed of the rotor from the cycle. ing.

The cloth amount detecting means 30 detects the amount of laundry put into the rotating drum 4, and is an inverter circuit 26 according to the load state received by the motor 5 when the rotating drum 4 is started up at a predetermined rotation speed. Since the current flowing through the current changes, the current detection circuit 29 detects the amount of current from the voltage across the resistor 28 connected in series with the current circuit, and the cloth amount detecting means 30 detects the amount of laundry from the amount of current. ..

Then, the opening and closing of the water supply valve 14 is controlled so that the control means 20 can obtain the water supply amount according to the amount of laundry, and the water level detecting means 16 monitors the water supply amount into the water tank 3.

The storage means 43 stores various information necessary for control by the control means 20.

The operation and operation of the drum-type washing machine configured as described above will be described below.

FIG. 3 is a flowchart of the dehydration process of the drum-type washing machine according to the first embodiment of the present invention, and FIG. 4 is a graph showing the relationship between the rotating drum rotation speed and the outer box amplitude of the drum-type washing machine. In FIG. 4, the rotation speed of the rotating drum indicates a range of 700 to 1000 r / min, which is a rotation speed region during steady dehydration rotation, and 700 r / min or less is omitted.

In FIGS. 3 and 4, when the dehydration process starts in step S1, the drain valve 13 opens in step S2 to perform a drainage operation for draining the washing water in the water tank 3.

After drainage, in step S3, in order to loosen the clothes, the rotating drum 4 is subjected to a loosening process in which the forward rotation and the reverse rotation operations are repeated at the first predetermined rotation speed (for example, about 40 r / min). Next, in step S4, the laundry is gradually raised to a second predetermined rotation speed (about 70 r / min) such that the laundry sticks to the inner surface of the rotating drum 4.

After that, the rotation speed of the rotary drum 4 is further increased, and in step S5, the rotation speed is gradually increased from 80 r / min to 700 r / min. At this time, if the value of the water tank vibration detecting means 41 for detecting the vibration of the water tank unit 2 is equal to or less than the determination value set in advance according to each rotation speed section (Y in step S6), the rotation speed is further increased. Then, the process proceeds to step S7. On the other hand, if the value of the water tank vibration detecting means 41 is larger than the determination value set in advance according to each rotation speed section, the process returns to the unraveling step of step S3 (N in step S6).

In step S7, the rotation speed of the rotary drum 4 is increased from 701 r / min to 1000 r / min, which is the maximum dehydration rotation speed. At this time, the outer box vibration detecting means 42 that detects the vibration of the outer box 1 sets the rotation speed, which is the smallest vibration amplitude in the section (701 to 1000 r / min) of the rotation speed region during the steady dehydration rotation, to the final target dehydration rotation. It is stored in the storage means 43 as the number X. This is the rotation speed indicated by the arrow A in FIG. Then, in step S8, the rotation speed of the rotary drum 4 is changed to the final target dehydration rotation speed X to perform dehydration.

When the final target dehydration speed X is lower than the maximum reached dehydration speed of 1000 r / min (Y in step S9), the dehydration time depends on the value of the final target dehydration speed X in order to ensure the dehydration performance. (Step S10). Then, dehydration is performed until the predetermined dehydration time elapses (N in step S11), and when the predetermined dehydration time elapses (Y in step S11), the dehydration process ends (step S12). On the other hand, if the maximum reaching dehydration speed is 1000 r / min (N in step S9), dehydration is performed until the predetermined dehydration time elapses (N in step S11), and when the predetermined dehydration time elapses (N in step S11). Y), the dehydration process is completed (step S12).

The final target dehydration speed X may be applied from the next operation.

In this way, by controlling the dehydration rotation speed to be changed according to the floor surface condition, the user can recognize that the product vibration is small.

As described above, in the first embodiment, in the dehydration stroke, the outer box 1 vibration in the rotation speed region during the steady dehydration rotation detected by the outer box vibration detecting means 42 that detects the vibration of the outer box 1 is the minimum. By setting the rotation speed of the rotating drum 4 at the time of becoming the final target dehydration rotation speed, it is possible to realize low vibration and low noise.

Further, in the dehydration process, the rotation speed of the rotating drum 4 when the outer box 1 vibration detected by the outer box vibration detecting means 42 is minimized is stored in the storage means 43, and the rotation speed stored from the next dehydration is finally stored. It is possible to realize low vibration and low noise by configuring the operation at the target dehydration speed.

Further, in the dehydration stroke, when the final target dehydration rotation speed of the rotating drum 4 is lower than the maximum reached dehydration rotation speed, the dehydration performance is ensured by extending the dehydration time according to the final target dehydration rotation speed. At the same time, low vibration and low noise can be realized.

As described above, the drum-type washing machine according to the present invention realizes low vibration and low noise while ensuring dehydration performance by controlling the dehydration speed to be changed according to the floor surface condition. Since it can be used, it can be applied to other washing machine applications such as vertical type.

1 Outer box 2 Water tank unit 3 Water tank 4 Rotating drum 5 Motor 20 Control means 24 Rotation speed detection means 41 Water tank vibration detection means 42 Outer box vibration detection means 43 Storage means

Claims (3)

From a water tank formed in a bottomed cylindrical shape, a bottomed cylindrical rotating drum rotatably arranged in the water tank, a motor for rotationally driving the rotating drum, the rotating drum, a water tank, a motor, and the like. An outer box that elastically supports a vibrating water tank unit, a rotation speed detecting means for detecting the rotation speed of the rotating drum that detects and connects the rotation speed of the motor, and the water tank provided in the water tank. The water tank vibration detecting means for detecting the vibration of the unit, the outer box vibration detecting means for detecting the vibration of the outer box, the storage means for storing various information, the motor and the like are controlled to wash, rinse, dehydrate, etc. The control means is provided with a control means for controlling each of the steps, and the control means is described when the outer box vibration in the rotation speed region during the steady dehydration rotation detected by the outer box vibration detecting means is minimized in the dehydration stroke. A drum-type washing machine whose final target dehydration speed is the rotation speed of the rotating drum. The control means stores in the storage means the rotation speed of the rotating drum when the outer box vibration detected by the outer box vibration detecting means is minimized in the dehydration stroke, and stores the rotation speed from the next dehydration. The drum-type washing machine according to claim 1, wherein the machine is operated with the final target dehydration speed. The control means according to claim 1 or 2, wherein when the final target dehydration rotation speed of the rotating drum is lower than the maximum reached dehydration rotation speed in the dehydration stroke, the dehydration time is extended according to the final target dehydration rotation speed. Drum type washing machine.

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