JP2008054910A - Drum type washing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid misdetection as abnormal vibration due to a resonance rotational speed of pitching of a rotary drum, and to prevent failure or the like caused by overflowing foam if starting failure by dehydration foam occurs because of residual foam water resulting from over-feeding of a detergent or draining conditions. <P>SOLUTION: The drum type washing machine includes a rotary drum 1 arranged inside a water receiving tub 3 and having a rotary shaft, a motor 6 for driving and rotating the rotary drum 1, and a control means 22 for controlling processes of washing, rinsing, dehydrating or the like. When dehydration starts in the dehydration process, the control means 22 controls so that a rotational speed of the motor 6 increases in a specified gradient by adjusting a conduction angle of a voltage applied to the motor 6, and that overflow of the foam is prevented by restricting rotation of the motor 6 when surplus foam is generated by specifying an upper bound value of the conduction angle of the voltage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a drum-type washing machine in which laundry is put into a rotating drum, and washing is performed by sequentially controlling each process such as washing, rinsing and dehydration.

  A conventional drum type washing machine of this type will be described with reference to FIGS. FIG. 6 is a longitudinal sectional view of a conventional drum type washing machine, and FIG. 7 is a diagram showing a transition of the dehydration rotation speed in the dehydration process of the drum type washing machine.

  As shown in FIG. 6, the rotating drum 1 is provided with a large number of water passage holes 2 on the entire outer peripheral portion, and is rotatably disposed in the water receiving tank 3. One end of the horizontal shaft 4 is fixed to the rotation center of the rotary drum 1, and a drum pulley 5 is fixed to the other end of the horizontal shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 and rotationally drives the rotary drum 1. A lid 8 is provided at the opening of the rotary drum 1 so as to be freely opened and closed. The water receiving tub 3 is suspended from the washing machine body 9 by a spring body 10 and is supported by a vibration isolating damper 11 so that vibration during dehydration is not transmitted to the washing machine body 9 and vibration during dehydration. A weight 12 for reduction is provided. The heater 13 heats the washing water in the water receiving tub 3. The control device 14 controls operations of the motor 6, the heater 13, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration (see, for example, Patent Document 1).

  The operation of the drum type washing machine configured as described above will be described below with reference to FIG.

  When the lid 8 is opened and the laundry is put into the rotary drum 1 and the operation is started, the rotary drum 1 is rotated at a low speed by the motor 6 in the washing process, and the laundry in the rotary drum 1 is lifted up. Dropped on the water surface. Thus, the washing process proceeds. In the rinsing process, intermediate dehydration is performed first, and then the same operation as in the washing process is performed. In the dehydration process, the rotary drum 1 is rotationally driven at a high speed, and the laundry is centrifugally dehydrated.

The dehydration process includes a cloth balance determination process (A) in which the rotating drum 1 is rotated at a predetermined rotation speed V01 (for example, 90 r / min) to determine the degree of deviation of the laundry, and the pitch resonance resonance rotation speed V02 ( For example, through the abnormal vibration determination process (B) for determining abnormal vibration of 300 r / min), the rotation of the rotating drum 1 is inhibited by bubbles when the rotational speed V03 to V04 of the rotating drum 1 is between 500 and 800 r / min. The dehydration bubble activation determination process (C) for determining the dehydration bubble activation failure is performed. If the dehydration bubble activation failure is not defective, the maximum rotational speed V05 (for example, 900 r / min) (D) is reached.
Japanese Patent Laid-Open No. 10-201988

  However, in such a conventional drum type washing machine, the foam and water contained in the laundry remain at the bottom of the water receiving tub during the dehydration process depending on the excessive amount of detergent and the drainage conditions such as the drainage path. However, the rotation of the rotating drum is hindered, causing the dehydration foam to start poorly.In this state, the foam further increases, so that the foam flows back to the detergent case through the hose, and the foam is released from there. There was a problem of causing overflow.

  Therefore, as a countermeasure, the dewatering bubble activation failure state is detected at 100 to 500 r / min, for example, by a method of detecting a change in the rotation speed of the motor, and the defoaming operation is performed. For example, depending on the type of the motor Even if many bubbles are generated, the torque of the motor is too strong and the rotation of the motor is not suppressed. Therefore, there is a problem that bubbles overflow.

  The present invention solves the above-mentioned conventional problems, and starts dehydrated foam due to residual foam water generated due to excessive detergent input or drainage conditions without erroneously detecting abnormal vibration of the pitch resonance resonance rotational speed of the rotating drum. It is an object to provide a drum type washing machine that effectively detects only when a defect occurs and prevents foam overflow.

  In order to solve the above-described conventional problems, a drum-type washing machine according to the present invention is provided in a water receiving tub and has a rotating drum having a rotating shaft in a horizontal direction or an inclined direction, and a motor that rotationally drives the rotating drum. And a rotation speed detection means for detecting the rotation speed of the motor, and a control means for executing each process such as washing, rinsing and dehydration, the control means at the time of dehydration start of the rinse process and the dehydration process, By adjusting the conduction angle of the voltage applied to the motor, the rotation speed of the motor is increased with a predetermined inclination, and an upper limit value of the conduction angle of the voltage is provided. The detection works effectively only when a dewatering foam start-up failure occurs due to residual foam water due to excessive detergent input or drainage conditions without erroneously detecting abnormal vibration of the pitch resonance resonance speed. , It is possible to prevent the overflowing foam.

  In the drum type washing machine of the present invention, when the dewatering foam start-up failure occurs due to residual foam water due to excessive detergent input or drainage conditions without erroneously detecting the abnormal vibration of the pitching resonance rotational speed of the rotating drum. The detection works effectively only on the surface, and the overflow of bubbles can be prevented.

  A first invention is a rotating drum having a rotating shaft in a horizontal direction or an inclined direction, a motor for rotating the rotating drum, and a rotation speed detecting means for detecting the rotation speed of the motor. And control means for executing each process such as washing, rinsing and dehydration, and the control means adjusts the conduction angle of the voltage applied to the motor at the start of dehydration in the rinse process and dehydration process. The rotation speed of the motor is increased at a predetermined slope and the upper limit value of the conduction angle of the voltage is set. Therefore, dehydrated foam due to residual foam water caused by excessive detergent supply or drainage conditions, etc. When a start-up failure occurs, bubble overflow can be prevented without erroneously detecting the abnormal vibration of the pitching resonance rotational speed of the rotating drum.

  In the second invention, in particular, during the dehydration process, the control means of the first invention is such that the rotation speed of the motor detected by the rotation speed detection means is lower than the target rotation speed by a predetermined rotation speed or more. In this case, the rotation of the motor is stopped, so that a hardware configuration for detecting bubbles is unnecessary, and bubbles can be detected at low cost.

  In the third aspect of the invention, in particular, the control means of the first aspect of the invention sets the upper limit value of the conduction angle of the voltage according to the power supply voltage value. Bubbles can be detected.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view showing a configuration example of a drum type washing machine according to the first embodiment of the present invention, and FIG. 2 is a circuit diagram of the drum type washing machine. In addition, about the same part as a prior art example, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 1, a rotating drum 1 is provided with a large number of water passage holes 2 on the entire outer periphery, and is rotatably arranged in a water receiving tank 3 with a rotation center axis inclined downward from the front to the rear. Has been established. One end of the rotating shaft 4 is fixed to the rotation center of the rotating drum 1, and a drum pulley 5 is fixed to the other end of the rotating shaft 4. The motor 6 is connected to the drum pulley 5 by a belt 7 via a motor pulley 6a, and rotationally drives the rotary drum 1 in the forward and reverse directions. A lid 8 is provided at the opening of the rotary drum 1 so as to be freely opened and closed. The water receiving tub 3 is supported by a spring body (not shown) from the washing machine main body 9 to prevent vibration during dehydration from being transmitted to the washing machine main body 9, and a weight for reducing vibration during dehydration (see FIG. Not shown). The heater 13 heats the washing water in the water receiving tub 3. The water supply valve 14 controls the water supply to the water receiving tank 3, and the drain valve 15 controls the water drainage in the water receiving tank 3.

  The control device 14 controls operations of the motor 6, the heater 13, and the like, and sequentially controls a series of processes such as washing, rinsing, and dehydration.

  The opening 9b provided in the upward inclined surface 9a on the front side of the washing machine main body 9 is covered with a lid 8 so that it can be opened and closed. By opening the lid 8, the first clothing entrance 3 provided in the water receiving tub 3 is provided. In addition, the laundry can be put into the rotary drum 1 through the second clothes insertion port 1 a provided in the rotary drum 1, and the laundry can be taken out from the rotary drum 1. Since the lid body 8 is provided on the inclined surface facing upward, the user can reduce the degree of bending the waist when putting in and out the laundry.

  FIG. 2 is an electric circuit configuration diagram relating to motor control according to Embodiment 1 of the present invention.

  The rectifier 17 is a rectifier that rectifies the commercial power supply 16 into direct current, the chopping means 18 controls the output of the rectifier 17 by high frequency PWM with a carrier frequency of 20 kHz, and the applied polarity switching means 19 outputs the output of the chopping means 18. Switch electrical polarity. The motor 6 includes a stator winding 6a, a commutator winding 6c, and commutators 6b and 6d. The rotation direction switching means 20 changes the connection relationship between the stator winding 6a and the commutator winding 6c in order to switch the rotation direction of the motor 6, and the winding switching means 21 changes the speed of the motor 6 during washing. It is for changing roughly between dehydration and dehydration. The control unit 22 controls operations of the chopping unit 18, the applied polarity switching unit 19, the rotation direction switching unit 20, and the winding switching unit 21. As for speed control, the control means 22 separately detects the rotational speed of the motor 6 and feedback-controls the PWM duty of the chopping means 18 so that this becomes a predetermined rotational speed. Further, the control means 22 has an application polarity history storage means 23 for storing the switching contents of the application polarity switching means 23 over the entire process. The applied polarity switching means 19, the rotation direction switching means 20, and the winding switching means 21 are constituted by relays 19a, 19b, 20a, 20b, and 21a, respectively, as shown in the figure. The above is the electrical configuration related to the control of the motor 6.

  FIG. 3 is a block diagram showing the configuration of the control device 11 according to Embodiment 1 of the present invention.

  The control means 22 is constituted by a microcomputer or the like, and controls the heater 13, the water supply valve 14, the drain valve 15, etc. via the power switching means 12 constituted by a bidirectional thyristor or the like, and a series of washing, rinsing and dehydration. The process is controlled sequentially.

  The input setting unit 24 is used by the user to input a desired setting course, start of operation, and the like, and outputs the input information to the control unit 22. The display means 25 displays the setting content, operation state, etc. input by the input setting means 24. The water level detection means 26 detects the water level in the water receiving tank 3, and the water temperature detection means 27 detects the water temperature in the water receiving tank 3 and outputs the detection result to the control means 22. The rotation speed detection means 29 detects the rotation speed of the motor 6 to detect the rotation speed of the rotary drum 1 and outputs the detection result to the control means 22. The storage means 28 stores data necessary for a series of controls. The power switch 30 opens and closes the power input from the commercial power supply 16.

  The rotation speed detection means 29 is configured to output 8 pulses every time the motor 6 makes one rotation. For example, if the reduction ratio of the motor 6 and the rotation drum 1 is 10.78: 1, the rotation drum 1 is 1 When it rotates, 88 pulses are output from the rotation detecting means 20. The control means 22 controls the rotation speed of the rotary drum 1 by controlling the conduction time of the motor 6 via the power switching means 12.

  When the washing is too easy, the rotating drum 1 is rotated at a first rotation speed N1 (for example, 45 r / min), so that the relay 21a of the winding switching means 21 is connected to the Y side shown in FIG. Control is performed. The rotational speed of the motor 6 is detected by the rotational speed detection means 29 shown in FIG. 3, and the control means 22 controls the rotational speed of the motor 6 by changing the conduction angle of the voltage applied to the motor 6 by the power switching means 12. To do. The motor 6 is connected to the drum 1 through a motor pulley 6a, a belt 7, and a drum pulley 5, and can rotate the rotating drum 1 at a rotational speed of 45 to 100 r / min. Further, by connecting the relays 20a and 20b of the rotation direction switching means 20 to the X side by the rotation direction switching means 20 and the chopping means 18, for example, the rotation drum 1 is moved in the forward direction (from the front of the washing machine body 9). By rotating the relays 20a and 20b of the rotation direction switching means 20 to the Y side, it can be rotated in the reverse direction (counterclockwise from the front of the washing machine body 9).

  Next, at the time of dehydration, the control means 22 first connects the relay 21a of the winding switching means 21 to the Y side shown in FIG. The rotation speed is increased to N2 (for example, 400 r / min), and then the relay 21a of the winding switching means 21 is connected to the X side shown in FIG. For example, it is rotated up to 900 r / min.

  When washing is too easy, since the rotational torque of the motor 6 is required at a low speed (for example, 45 r / min), the torque is generated at a low speed in the low speed rotation range, but at a high speed (for example, 900 r / min) in dehydration. In order to perform centrifugal dehydration, it can be rotated at a high rotation speed in a high speed rotation range.

  The heater 10 heats the washing water in the water receiving tank 3, the water supply valve 14 supplies water to the water receiving tank 3, and the drain valve 15 drains the washing water in the water receiving tank 3.

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

  First, the lid 8 is opened, the laundry is put into the rotary drum 1, the power switch 30 is turned on, and then the operation is started by operating the start / pause switch (not shown) of the input setting means 24. Then, the water supply valve 14 operates to supply water, and when the water level detecting means 26 detects a predetermined water level, the water supply is stopped and the motor 6 is driven. In the washing process, since water is contained in the laundry, the rotating drum 1 is rotationally driven by the motor 6 while supplying water, and the laundry in the rotating drum 1 is lifted and dropped onto the water surface. When the washing process is finished, the drain valve 15 operates to drain the washing water in the water receiving tub 3. Thereafter, in the dehydration process through the rinsing process, the rotary drum 1 is driven to rotate at high speed by the motor 6 and the laundry is dewatered by centrifugation.

  Here, the dehydrating operation will be described with reference to FIGS. FIG. 5 is a diagram showing the transition of the dehydration rotation speed during dehydration, and FIG. 6 is a flowchart during dehydration.

  When the dehydration process starts in step 100, drainage is started in step 101, and in step 102, drainage is performed until a predetermined water level (reset water level) is detected. Next, in step 103, the rotary drum 1 is rotated forward and reverse to loosen the laundry, and then in step 104, the cloth balance determination process (A ′) in which the rotary drum is rotated at the first predetermined rotational speed V1. ) (For example, V1: 90 r / min) to determine the laundry balance state. If it is determined that the balance state is bad, the rotary drum 1 is stopped in step 106 after step 105, 1 is added to N in step 107, and the process returns to step 103. When the operations of Steps 103 to 107 are repeated a predetermined number of times, that is, when N = 2 in Step 105, the process proceeds to Step 108, where water is supplied again to perform the laundry offset correction operation. Proceed to

  On the other hand, if it is determined in step 104 that the balance state is good, in step 109, the rotational speed of the rotating drum 1 is raised to a second predetermined rotational speed V2 (for example, V2: 100 r / min). Control for setting an upper limit value for the conduction angle of the voltage applied to the motor 6 is started (step 110), and the dehydration bubble activation failure determination in step 111 is performed until a predetermined rotation speed V3 (for example, V3: 400 r / min) is reached. (B ′) is performed. Thereafter, in the vicinity of the second predetermined rotation speed V4, determination is made as to whether or not abnormal vibration due to other causes (for example, contamination of foreign matter in the water receiving tank 3) has occurred (C ′), including poor dehydration activation due to bubbles. I do.

  Here, a method of determining dehydration bubble activation failure (B ′) will be described. As the rotational speed of the rotating drum 1 increases, the foam water is discharged from the laundry. At this time, when the detergent concentration of the drainage liquid is too high or the drainage conditions are bad, the drainage liquid remaining at the bottom of the water receiving tank 3 is agitated by the rotating drum 1 and foamed. The space between the rotating drums 1 is filled, and the rotation of the rotating drum 1 begins to be prevented. This state is a dehydration bubble activation failure state. Therefore, the conduction angle of the voltage applied to the motor 6 is adjusted in order to maintain the rotation speed of the rotary drum 1 at the target rotation speed between the second predetermined rotation speed V2 and the third predetermined rotation speed V3. At this time, unless the dehydrated foam is in a defective starting state, there is no resistance due to the foam, so the conduction angle of the voltage does not reach the upper limit. On the other hand, if the dewatering bubble activation is in a defective state, a resistance is generated in the rotation of the rotating drum 1 due to the occurrence of bubbles, and in order to maintain the rotation speed of the rotating drum 1 at the second predetermined rotation speed V2, The conduction angle is more than necessary, and eventually reaches the upper limit. Therefore, since the rotational speed of the motor 6 does not increase, a state lower than the target rotational speed continues. When the state where the difference from the target rotational speed is more than a predetermined rotational speed (for example, 50 r / min) continues for a predetermined time (for example, 5 seconds) or more, it is determined that the dewatering bubble is not activated. It is not determined that the foam has started badly.

  As described above, if it is determined in step 111 that the dehydrated foam activation is not in a defective state, the rotational speed of the rotating drum 1 is further increased in step 112, and in step 113, other causes (for example, in the water receiving tank 3). Judgment (C ′) is made as to whether or not abnormal vibration has occurred due to foreign matter contamination. The abnormal vibration determination method is the same as the dehydrated foam activation failure.

  If it is determined in step 113 that there is no abnormal vibration, the control for setting the upper limit value for the conduction angle of the voltage applied to the motor 6 is terminated (step 115), and the rotational speed of the rotary drum 1 is further increased. After a predetermined time of operation at a maximum dehydration speed V4 (for example, V4: 900 r / min) (D ′), the rotating drum 1 is stopped at step 117, the dehydration process is terminated, and the process proceeds to the next process of step 118.

  On the other hand, if it is determined in step 111 or step 113 that the dehydrated foam activation failure state or the abnormal vibration state is present, the defoaming operation in step 114 is performed, and then the dehydrating operation is not performed and the process proceeds to the next step in step 118 .

  In the first embodiment, when the rotational speed of the motor 6 is lower than the target rotational speed by a predetermined rotational speed or more continues for a predetermined time, it is determined that the dehydrated bubble activation is defective. If it does not reach the predetermined rotational speed in a predetermined time, the same effect can be obtained even if it is determined that the dehydrated foam is not activated.

  In the first embodiment, the rotation center axis of the rotary drum 1 is described as being inclined downward from the front to the rear. However, the same is true even if the rotation center axis is in a substantially horizontal state. The effect of can be obtained.

  As described above, the drum-type washing machine according to the present invention does not erroneously detect the abnormal vibration of the pitching resonance rotational speed of the rotating drum, and the dehydrated foam due to the remaining foam water caused by excessive detergent input or drainage conditions. Since the detection works effectively only when a start-up failure occurs and foam overflow can be prevented, it can be applied to various washing machines having a dehydration process.

Sectional drawing of the drum type washing machine in Embodiment 1 of this invention Electric circuit configuration diagram of the motor of the drum type washing machine The circuit diagram which shows the structure of the control apparatus of the drum type washing machine The figure which shows transition of dehydration rotation speed at the time of dehydration of the drum type washing machine Flow chart during dehydration Vertical section of a conventional drum-type washing machine The figure which shows transition of dehydration rotation speed in the dehydration process of the drum type washing machine

Explanation of symbols

1 Rotating drum 3 Water receiving tank 6 Motor 22 Control means

Claims (3)

A rotating drum disposed in the water receiving tub and having a rotating shaft in a horizontal direction or an inclined direction, a motor for rotationally driving the rotating drum, a rotational speed detecting means for detecting the rotational speed of the motor, washing, rinsing, dehydrating Control means for controlling each of the strokes, etc., and the control means adjusts the conduction angle of the voltage applied to the motor at the start of dehydration in the rinsing stroke and the dehydration stroke, thereby adjusting the rotation speed of the motor. A drum type washing machine configured to rise at a predetermined inclination and to provide an upper limit value of the conduction angle of the voltage. The control means is configured to stop the rotation of the motor during a dehydration process when the rotation speed of the motor detected by the rotation speed detection means is lower than the target rotation speed by a predetermined rotation speed or more for a predetermined time. Item 2. The drum type washing machine according to Item 1. The drum type washing machine according to claim 1 or 2, wherein the control means sets an upper limit value of a conduction angle of the voltage according to a power supply voltage value.