JP4154103B2 - Drum washing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a drum-type washing machine that stirs laundry in a drum based on rotating the drum around a horizontal axis.
[0002]
[Problems to be solved by the invention]
Some drum-type washing machines are configured to rotate the drum in both forward and reverse directions during washing. In the case of this configuration, it is possible only to loosen the entanglement of the laundry, so there is room for improvement in terms of cleaning ability.
[0003]
Some of the drum type washing machines have a configuration in which air is sucked into a duct through a through hole of the water receiving tub, warmed in the duct, and discharged into the water receiving tub. In the case of this configuration, when the water surface is inclined based on the rotation of the drum during washing, bubbles due to the detergent are pushed into the duct through the through hole. Then, the foam in the duct flows back into the water receiving tub when rinsing and adheres to the laundry after washing, which may reduce the cleaning ability.
[0004]
This invention is made | formed in view of the said situation, The objective is to provide the drum type washing machine which has the outstanding washing | cleaning capability.
[0005]
[Means for Solving the Problems]
  The drum type washing machine according to claim 1, wherein a water receiving tub into which washing water is injected, a drum that is stored in the water receiving tub and into which laundry is put, and the drum is rotated about a horizontal axis. A washing motor, a through hole provided in a portion eccentric to the reverse side of the drum at the bottom of the water receiving tank, a water temperature sensor for detecting the water temperature in the water receiving tank, and drive control of the washing motor The rotation state of the drum is controlled based on the detection result of the water temperature sensor during washing.Pre-recordedControl means for comparing with a reference value, and the control means has a detection result of the water temperature sensor equal to or lower than the reference value at the time of washing.WhenIf judged and greater than the reference valueWhenIn any case, the drum isIn the reverse direction at a slower speed than the forward directionThe drum is rotated so that the drum rotates in different directions in both forward and reverse directions.The degree to which the reverse rotation speed when rotating in the reverse direction is slower than the normal rotation speed when rotating in the forward direction.It changes according to the detection result of the water temperature sensor, and the detection result of the water temperature sensor is not more than the reference value.WhenIf you decideCompared to the case where the detection result of the water temperature sensor is determined to be larger than the reference value, the degree of slowing down the reverse rotation speed of the drum is reduced,The detection result of the water temperature sensor is larger than the reference valueWhenIf you decideThe degree of slowing down the reverse rotation speed of the drum is increased as compared with the case where the detection result of the water temperature sensor is determined to be equal to or less than the reference value.It is characterized by being a thing.
  According to the first aspect of the present invention, since the through hole is provided in the portion of the water receiving tank that is eccentric to the reverse side of the drum, the amount of foam extruded from the through hole is reduced. For this reason, since the amount of foam flowing back into the water receiving tank during rinsing or the like is reduced, the amount of foam adhering to the laundry after washing is reduced, and the washing ability is enhanced. Also, depending on the difference in the amount of foam generated due to the difference in water temperature, the drumThe degree to which the reverse speed is slower than the normal speedSince it changes, it is prevented that the absolute extrusion amount of foam increases due to the difference in water temperature.
  The drum-type washing machine according to claim 2, wherein a water receiving tub into which washing water is injected, a drum that is stored in the water receiving tub and into which laundry is put, and the drum is rotated about a horizontal axis. A washing motor, a through hole provided at a portion eccentric to the reverse side of the drum at the bottom of the water receiving tank, and a rotation state of the drum based on driving control of the washing motor The weight of the laundry put in the drum is detected before washing.Compare the detection result with a pre-recorded reference value.Control means, and the control meansWhether to slow down the reverse rotation speed when the drum rotates in the reverse direction compared to the normal rotation speed when rotating in the forward direction during washing is determined according to the detection result of the weight,The weight detection result is smaller than the reference valueWhenIf you decideThe reverse speed of the drum is made slower than the normal speed,The weight detection result is not less than the reference value.WhenIf you decideThe reverse rotation speed of the drum is the same as the normal rotation speed.It is characterized by being a thing.
  According to the second aspect of the present invention, since the through hole is provided in the portion of the water receiving tank that is eccentric to the reverse side of the drum, the amount of foam extruded from the through hole is reduced. For this reason, since the amount of foam flowing back into the water receiving tank during rinsing or the like is reduced, the amount of foam adhering to the laundry after washing is reduced, and the washing ability is enhanced. Moreover, if the detection result of the weight of the laundry before washing is smaller than the reference valueReduce the drum reverse speed compared to the normal speed, before washing.If the laundry weight detection result is above the reference valueSince the reverse rotation speed of the drum is the same as the normal rotation speed,At low weightIs highAlthough the amount of foam generated is larger than that at the time of weight, the foam extrusion rate is suppressed. For this reason, since it is prevented that the absolute extrusion amount of foam increases due to the difference in the amount of cloth, it is possible to prevent the cleaning ability from deteriorating due to the adhesion of foam.
[0006]
  The drum-type washing machine according to claim 3,The control means rotates the drum in the forward direction for a long time from the reverse direction during washing.However, it has the characteristics.
  According to the means of claim 3,The washing ability can be increased by increasing the stirring power of the laundry based on rotating the drum in the forward direction for a long time during washing, and unraveling the laundry based on rotating the drum in the reverse direction for a short time. Rise.
  The drum-type washing machine according to claim 4,The control means rotates the drum in the forward direction at a high speed so that the laundry sticks to the inner peripheral surface of the drum, and rotates in the reverse direction at a low speed at which the laundry falls.However, it has the characteristics.
  According to the means of claim 4,Even when the laundry is packed in the drum so that it cannot fall, the deformation of the laundry is urged by the centrifugal force, so that a stirring effect is produced and the cleaning performance at the forward rotation is enhanced.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, in FIG. 5, the cabinet 1 is formed based on combining steel plates into a rectangular box shape, and a circular opening 2 is formed on the front plate of the cabinet 1. A circular door 3 is rotatably mounted on the front plate of the cabinet 1, and the opening 2 is opened and closed based on a rotation operation of the door 3.
[0009]
As shown in FIG. 4, cylinders 5 of a plurality of absorbers 4 are fixed to the bottom plate of the cabinet 1. A bracket 7 is fixed to the rods 6 of the plurality of absorbers 4, and a water receiving tank 8 is fixed to the bracket 7. The water receiving tank 8 has a cylindrical shape with a closed rear surface, and as shown in FIG. 5, the water receiving tank 8 is inclined so that the axial center line 9 descends toward the rear.
[0010]
A cylindrical drain port 10 is fixed to the bottom of the water receiving tank 8, and the drain port 10 communicates with the outside of the cabinet 1 through a drain hose 11. A drain valve 12 is attached to the drain port 10. The drain valve 12 is driven by a valve motor (not shown), and the drain port 10 is opened and closed based on switching of the drain valve 12 between an open state and a closed state in accordance with forward / reverse rotation of the valve motor. Is done.
[0011]
A washing motor 13 is mounted on the rear surface of the water receiving tank 8, and a drum 15 is fixed to the rotating shaft 14 of the washing motor 13 in the water receiving tank 8. The washing motor 13 is composed of an outer rotor type three-phase DC brushless motor. When the washing motor 13 is driven, the drum 15 rotates integrally with the rotary shaft 14 (direct drive system). The drum 15 has a cylindrical shape with a closed rear surface, and is in an upwardly inclined state coaxial with the water receiving tank 8.
[0012]
A circular opening 16 and an opening 17 are formed in the front plate of the water receiving tank 8 and the front plate of the drum 15, and a cylinder is formed between the opening 16 of the water receiving tank 8 and the opening 2 of the cabinet 1. A bellows 18 is interposed. The bellows 18 connects the opening 2 and the opening 16 in a watertight manner. The door 15 is opened in the drum 15 from the opening 2 of the cabinet 1 to the opening 16 of the water receiving tank 8 and the drum. Laundry (not shown) is put through 15 openings 17.
[0013]
A plurality of protruding baffles 19 are provided on the inner peripheral surface of the drum 15. When the drum 15 rotates at a normal washing speed (for example, 60 rpm or less), the laundry is lifted upward by the baffle 19 and moved downward. When the drum 15 rotates at a high washing speed (for example, more than 60 rpm), the laundry is stuck to the inner peripheral surface of the drum 15 by centrifugal force (squeezing washing). A plurality of dewatering holes 20 are formed in the peripheral plate of the drum 15 over the entire area, and the inside of the drum 15 communicates with the water receiving tank 8 through the plurality of dewatering holes 20.
[0014]
As shown in FIG. 6, an electromagnetic water supply valve 21 is fixed to the rear plate of the cabinet 1 at the upper end. This water supply valve 21 has an input port 22, a water injection output port 23, and a dehumidification output port 24, and the input port 22 is connected to a water tap (not shown) via a water injection hose 25. Note that the input port 22 of the water supply valve 21 is always open, the water supply valve 21 is in a closed state in which both the water injection output port 23 and the dehumidification output port 24 are closed, and only the water injection output port 23 is closed. The open state is switched to the second open state in which only the dehumidification output port 24 is closed.
[0015]
A detergent case 26 is fixed to the top plate of the cabinet 1 in front of the water supply valve 21. A water inlet 27 is provided at the bottom of the detergent case 26, and the water inlet 27 is inserted into the water receiving tank 8. This detergent case 26 is connected to a water injection output port 23 of the water supply valve 21 via a tap water hose 28, and when the water injection output port 23 is opened, tap water enters the detergent case 26 from the tap through the tap water hose 28. It flows in and is injected into the water receiving tank 8 through the water inlet 27.
[0016]
A water supply pump 29 is fixed to the rear plate of the cabinet 1 on the side of the water supply valve 21. This water supply pump 29 is of the self-priming type using a pump motor 30 (see FIG. 3) as a drive source, and one end of a bath water hose (not shown) is connected to the water inlet 31 of the water supply pump 29. Yes. The other end of the bath water hose is inserted in a bath tub (not shown), and bath water is pumped into the water supply pump 29 through the bath water hose when the pump motor 30 is driven.
[0017]
The water discharge port of the water supply pump 29 is connected to the detergent case 26 via a bath water relay hose 32, and bath water in the water supply pump 29 is supplied into the detergent case 26 via the bath water relay hose 32 when the pump motor 30 is driven. Then, it is injected into the water receiving tank 8 through the water inlet 27 of the detergent case 26.
[0018]
As shown in FIG. 5, a hot water heater 33 is fixed in the water receiving tank 8 at the bottom, and when the hot water heater 33 generates heat, the water in the water receiving tank 8 is heated. Is done. A water temperature sensor 34 (see FIG. 3) is fixed in the water receiving tank 8 at the bottom. The water temperature sensor 34 is composed of a thermistor and outputs a water temperature signal at a level corresponding to the water temperature in the water receiving tank 8.
[0019]
As shown in FIG. 6, a water level sensor 35 is disposed in the cabinet 1. This water level sensor 35 has a conductive pole inserted into an inner periphery of a cylindrical coil so as to be slidable in the axial direction, and the pole is slid according to the water level in the water receiving tank 8. The lap amount (inductance) in the axial direction is changed, and a water level signal having a frequency corresponding to the wrap amount between the pole and the coil (according to the water level in the water receiving tank 8) is output.
[0020]
A drying device 36 is disposed in the cabinet 1. The drying device 36 promotes drying of the laundry on the basis of injecting high-temperature dry air into the water receiving tank 8 and is configured as follows.
[0021]
<About the drying device 36>
As shown in FIG. 4, a circular intake port 37 is formed in the rear plate of the water receiving tank 8. The intake port 37 corresponds to a through hole, and is located at a portion eccentric to the right side from the center in the left-right direction of the water receiving tank 8. An arc-shaped duct cover 38 is fixed to the rear surface of the water receiving tank 8. The duct cover 38 forms a passage-shaped duct in cooperation with the rear surface of the water receiving tank 8, and the air inlet 32 opens at the lower end portion in the duct cover 38. In addition, the code | symbol 39 is a centerline which shows the left-right direction center part of the water receiving tank 8. FIG.
[0022]
A fan casing 40 is fixed to the upper end portion of the duct cover 38. The fan casing 40 has a spiral shape having an air outlet on the front surface and an air inlet (neither shown) on the lower surface, and the upper end of the duct cover 38 is connected to the air inlet of the fan casing 40. Yes. As shown in FIG. 6, a fan 41 is accommodated in the fan casing 40, and a small pulley 43 is fixed to a rotating shaft 42 of the fan 41.
[0023]
A fan motor 44 is fixed to the upper surface of the water receiving tank 8. The fan motor 44 is composed of a capacitor induction motor, and a large pulley 46 is fixed to a rotating shaft 45 of the fan motor 44. A belt 47 is stretched between the large pulley 46 and the small pulley 43. When the fan motor 44 is driven, the fan 41 rotates, and air in the water receiving tank 8 passes through the duct cover 38 from the air inlet 37. It is sucked into the fan casing 40.
[0024]
A heater case 48 is fixed to the upper surface of the water receiving tank 8 in front of the fan casing 40. The heater case 48 is connected to the air outlet of the fan casing 40, and the air sucked into the fan casing 40 flows into the heater case 48. A warm air heater 49 is accommodated in the heater case 48, and the air that flows into the heater case 48 is heated by the warm air heater 49.
[0025]
As shown in FIG. 5, a cylindrical duct 50 is fixed to the front surface of the water receiving tank 8, and one end of the duct 50 is connected to the heater case 48. The other end of the duct 50 communicates with the water receiving tank 8, and the warm air generated in the heater case 48 is discharged into the water receiving tank 8 through the duct 50.
[0026]
As shown in FIG. 6, one end of a dehumidifying hose 51 is connected to the dehumidifying output port 24 of the water supply valve 21. The other end of the dehumidifying hose 51 is connected to the upper end of the duct cover 38. When the dehumidifying output port 24 is opened, tap water is injected into the duct cover 38 from the tap through the dehumidifying hose 51. The drying device 36 is configured as described above.
[0027]
As shown in FIG. 5, an operation panel 52 is fixed to the front plate of the cabinet 1, and a circuit box (not shown) is mounted on the rear surface of the operation panel 52. A circuit board (not shown) is housed in the circuit box, and a control device 53 (see FIG. 3) and a drive circuit 54 (see FIG. 3) mainly composed of a microcomputer are mounted on the circuit board. Has been.
[0028]
The control device 53 corresponds to a control means. As shown in FIG. 3, the water temperature sensor 34 and the water level sensor 35 are electrically connected to the input terminal of the control device 53, and the output terminal of the control device 53 is connected. The drain valve 12, the water supply valve 21, the pump motor 30, the hot water heater 33, the fan motor 44, and the hot air heater 49 are electrically connected via a drive circuit 54.
[0029]
The drive circuit 54 has an inverter circuit section (not shown). This inverter circuit unit is formed by bridge-connecting six IGBTs, and the washing motor 13 is electrically connected to the inverter circuit unit.
[0030]
A rotation sensor 55 is electrically connected to the input terminal of the control device 53. The rotation sensor 55 includes a Hall IC corresponding to the U-phase stator coil of the washing motor 13 and a Hall IC corresponding to the V-phase stator coil. The V-phase Hall IC detects the rotor magnet and outputs a U-phase position signal and a V-phase position signal, and the control device 53 performs an arithmetic process on the U-phase position signal and the V-phase position signal. Based on this, a W-phase position signal is generated.
[0031]
The control device 53 includes a PWM signal generation circuit, an energization signal generation circuit, and a waveform synthesis circuit (all not shown). Among them, the PWM signal generation circuit generates a speed detection signal based on the U-phase position signal to the W-phase position signal, and generates a voltage command based on the speed command signal and the speed detection signal. The PWM signal is generated based on comparing the voltage command with the triangular wave carrier signal. The speed command signal is generated by the control device 53 based on data recorded in advance in the ROM.
[0032]
The energization signal generation circuit generates six energization signals based on the U-phase position signal to the W-phase position signal. These six energization signals individually determine the switching timing of energization phases for the six IGTs of the inverter circuit unit, and the waveform synthesis circuit synthesizes the six energization signals and the PWM signal. Based on the above, drive signals are individually generated for the six IGBTs. Then, each IGBT is individually turned on / off based on the drive signal, and the washing motor 13 is rotated at a speed corresponding to the speed command signal based on the application of the on / off controlled three-phase AC voltage to the washing motor 13.
[0033]
As shown in FIG. 3, a start switch 56 and a plurality of setting switches 57 are electrically connected to the input terminal of the control device 53. The start switch 56 and the plurality of setting switches 57 are mounted on the front surface of the operation panel 52, and the control device 53 detects the operation content of the setting switch 57 based on the output signal from the setting switch 57, and the operation content. Based on the detection result, the washing time, the number of times of rinsing, the dehydration time, the washing course, the drying course are set, and the presence / absence of the hot water use mode and the bath water use mode are determined.
[0034]
Next, the operation of the above configuration will be described. The following operation is executed by the control device 53 based on a control program recorded in advance in the ROM. When the power is turned on, the control device 53 proceeds to step S1 in FIG. 1A, and performs initialization processing represented by the following (1) to (4).
[0035]
(1) Set washing time, number of rinses, dehydration time, and drying time to standard values (standard course setting).
(2) Set the bath water use mode to none.
(3) Set the hot water use mode to none.
(4) The drain valve 12 is closed, and the water injection output port 23 and the dehumidification output port 24 of the water supply valve 21 are closed.
[0036]
When the control device 53 detects the operation of the setting switch 57 in step S2, the control device 53 proceeds to step S3 and executes a setting processing operation corresponding to the operation content of the setting switch 57. Thereafter, when the operation of the start switch 56 is detected in step S4, it is determined that there is an operation command, and the process proceeds to step S5.
[0037]
When the control device 53 proceeds to step S5, the water injection output port 23 of the water supply valve 21 is opened, and tap water is injected into the water receiving tank 8 until the water level signal from the water level sensor 35 reaches the set water level. When the bath water use mode is set, the control device 53 supplies drive power to the pump motor 30 in step S5, and injects bath water into the water receiving tank 8 until the water level signal from the water level sensor 35 reaches the set water level. Further, when the hot water use mode is set, the water in the water receiving tank 8 is heated to a set temperature of 30 ° C. or higher based on driving control of the hot water heater 33.
[0038]
When the control device 53 injects water at the set water level into the water receiving tank 8, the control device 53 proceeds to step S6 and determines whether or not the washing time has elapsed since the detection of the operation command. This washing time is set to a standard value (for example, 15 minutes) when setting the standard course, and is set according to the operation content of the setting switch 57 when the setting switch 57 for setting the washing time is operated. When the control device 53 detects that the washing time has not elapsed in step S6, the control device 53 proceeds to step S7.
[0039]
When the control device 53 proceeds to step S <b> 7, it detects the water temperature T in the water receiving tank 8 based on the water temperature signal from the water temperature sensor 34. Then, the detected water temperature T is compared with a reference value To (for example, 30 ° C.) recorded in advance, and when “detected water temperature T> reference value To”, the process proceeds to step S8 and “detected water temperature T ≦ reference value To”. If so, the process proceeds to step S9.
[0040]
When the control device proceeds to step S8, the following high-temperature rotation pattern is read from the ROM, and steps S6, S7, and S8 are repeated. The speed command signal is set based on the rotation pattern for high temperature until the washing time is detected in step S6 or the detected water temperature is decreased in step S7, and the drive signal corresponding to the speed command signal is set. Based on the output to the inverter circuit, the washing motor 13 and the drum 15 are rotated in a high-temperature rotation pattern.
[0041]
<Rotation pattern for high temperature>
(1) The washing motor 13 is rotated in the direction of arrow A (forward direction) in FIG. 4 at a speed of 50 rpm for 16 seconds.
(2) The washing motor 13 is stopped for 4 seconds based on applying an electric braking force such as DC braking to the washing motor 13.
(3) The washing motor 13 is rotated in the direction of arrow B (reverse direction) in FIG. 4 for 16 seconds at a speed of 40 rpm.
(4) The washing motor 13 is stopped for 4 seconds based on applying an electric braking force such as DC braking to the washing motor 13. Note that the solid line in FIG. 1B shows a high-temperature rotation pattern.
[0042]
When the control device 53 proceeds to step S9 in FIG. 1A, the following low-temperature rotation pattern is read from the ROM, and steps S6, S7, and S9 are repeated. The speed command signal is set based on the low temperature rotation pattern until the washing time is detected in step S6 or the detected water temperature rise is detected in step S7, and a drive signal corresponding to the speed command signal is set. Based on the output to the inverter circuit, the washing motor 13 and the drum 15 are rotated in a low temperature rotation pattern.
[0043]
<Rotation pattern for low temperature>
(1) The washing motor 13 is rotated in the forward direction for 16 seconds at a speed of 50 rpm.
(2) The electric motor is stopped for 4 seconds based on applying an electric braking force to the washing motor 13.
(3) The washing motor 13 is rotated in the reverse direction at a speed of 45 rpm for 16 seconds.
(4) The electric motor is stopped for 4 seconds based on applying an electric braking force to the washing motor 13. The two-dot chain line in FIG. 1 (b) shows a low temperature rotation pattern.
[0044]
When detecting that the washing time has elapsed in step S6 of FIG. 1A, the control device 53 proceeds to step S10 and stops rotating based on applying an electrical braking force to the washing motor 13. And it transfers to step S11 and the water in the water receiving tank 8 is discharged | emitted outside based on opening the drain valve 12. FIG.
[0045]
When the control device 53 drains the water in the water receiving tank 8, the control device 53 proceeds to step S12 and performs dehydration. In this dehydration, the washing motor 13 is rotated in the forward direction at a speed higher than that at the time of washing while the drain valve 12 is open. During dehydration, water released from the laundry by centrifugal force passes through the plurality of dehydration holes 20. It is discharged into the water receiving tank 8 and discharged out of the machine through the drain valve 12.
[0046]
When the dehydration is completed, the control device 53 proceeds to the rinsing process in step S13. As shown in FIG. 2, this rinsing process consists of water injection, rinsing, drainage, dehydration, water injection, rinsing, and drainage. At the time of water injection, as described above, tap water at a set water level in the water receiving tank 8 or Bath water is injected, and at the time of rinsing, the laundry is agitated in the form of knocking washing based on the rotation of the drum 15 with tap water or bath water being injected. Further, when draining, the water in the water receiving tub 8 is discharged to the outside based on the opening of the drain valve 12, and when dehydrating, the water is discharged from the laundry to the outside based on the high speed rotation of the drum 15.
[0047]
When the control device 53 finishes the rinsing process, the control device 53 proceeds to the dehydration process in step S14 of FIG. As described above, this dehydration process discharges water from the laundry to the outside of the machine based on the high-speed rotation of the drum 15, and when the control device 53 finishes the dehydration process, the process proceeds to the drying process of step S15. Transition. In this drying process, the dehumidifying output port 24 of the water supply valve 21 is opened while the fan motor 44 and the hot air heater 49 are driven. During the drying process, the water receiving tank is passed through the duct cover 38, the heater case 48, and the duct 50. Hot air is injected into 8. At this time, tap water is injected into the duct cover 38 from the tap and is dehumidified based on the hot and humid air in the duct cover 38 coming into contact with the low temperature tap water.
[0048]
According to the first embodiment, when washing, the drum 15 is rotated in the forward direction (arrow A direction in FIG. 4) at a high speed and is rotated in the reverse direction (arrow B direction in FIG. 4) at a low speed. Rotated with a difference. For this reason, the agitation frequency (falling frequency) of the laundry is increased based on the normal rotation of the drum 15 at a high speed, and the entanglement of the laundry is loosened based on the reverse rotation of the drum 15, thereby increasing the cleaning ability. .
[0049]
In addition, an air inlet 37 is provided in a portion of the bottom of the water receiving tank 8 that is eccentric to the reverse rotation side (arrow B direction side) of the drum 15. For this reason, although the foam due to the detergent is pushed out from the air inlet 37 into the duct cover 38 based on the inclination of the water surface in the water receiving tank 8 when the drum 15 is reversed, the reverse rotation speed of the drum 15 is higher than the normal rotation speed. Since it is slow, the amount of foam extrusion is small. Accordingly, since the amount of foam flowing back from the duct cover 38 into the water receiving tank 8 during rinsing is reduced, the amount of foam adhering to the laundry after washing is reduced, and the cleaning ability is enhanced. At the same time, since the amount of foam that gets on the hot air during drying and adheres to the electrical components such as the warm air heater 49 is reduced, the durability of the electrical components is enhanced.
[0050]
Further, when the water temperature in the water receiving tank 8 is high, the reversing speed of the drum 15 is delayed compared with the case where the water temperature is low. Therefore, the foam extrusion rate is suppressed when the water temperature is high but the amount of foam generated is larger than when the water temperature is low. For this reason, since the absolute amount of foam extrusion is prevented from increasing due to the difference in the washing environment (water temperature), it is possible to prevent the cleaning ability from being lowered due to the adhesion of foam.
[0051]
FIG. 7 shows the experimental results showing the relationship between the water temperature in the water receiving tank 8 and the amount of bubbles generated by a solid line, and the relationship between the water temperature in the water receiving tank 8 and the detergency. As is apparent from the figure, the amount of foam generated is particularly large when the water temperature is between 30 ° C. and 50 ° C. Therefore, if the rotational speed at the time of reverse rotation of the drum 15 is reduced with 30 ° C. as a reference value, It can be seen that the amount of extrusion is effectively reduced.
[0052]
In addition, the drum 15 was rotated at high speed in the forward direction during dehydration immediately after the washing operation. For this reason, foam attached to the laundry at the time of washing is less likely to enter the duct cover 38 from the air inlet 37, and also from this point, it is possible to prevent the cleaning ability from being deteriorated due to the adhesion of foam.
[0053]
Next, a second embodiment of the present invention will be described with reference to FIG. When the control device 53 injects tap water or bath water at a set water level into the water receiving tank 8 in step S5 of FIG. 8A, the control device 53 proceeds to step S20 and based on the water temperature signal from the water temperature sensor 34. The water temperature T inside is detected. Then, the detected water temperature T is compared with a set value (for example, 30 ° C.). When “detected water temperature T> 30 ° C.”, the process proceeds to step S 21, and when “detected water temperature T ≦ 30 ° C.”, step S 22. Migrate to
[0054]
When the control device proceeds to step S21, the following high-temperature rotation pattern is read from the ROM, and steps S21 and S23 are repeated. Then, the speed command signal is set based on the high temperature rotation pattern until the elapse of the correction time (washing time−set value 5 minutes) is detected in step S23, and the drive signal corresponding to the speed command signal is set to the inverter circuit unit. The washing motor 13 and the drum 15 are rotated in a high temperature rotation pattern on the basis of the output to.
[0055]
<Rotation pattern for high temperature>
(1) The washing motor 13 is rotated in the forward direction for 16 seconds at a speed of 50 rpm.
(2) The washing motor 13 is stopped for 4 seconds.
(3) The washing motor 13 is rotated in the reverse direction at a speed of 40 rpm for 16 seconds.
(4) The washing motor 13 is stopped for 4 seconds. Note that the solid line in FIG. 8B shows a high-temperature rotation pattern.
[0056]
When the control device 53 proceeds to step S22 in FIG. 8A, the following low-temperature rotation pattern is read from the ROM, and steps S22 and S24 are repeated. Then, until the washing time is detected in step S24, the speed command signal is set based on the low temperature rotation pattern, and the drive motor corresponding to the speed command signal is output to the inverter circuit unit. 13 and the drum 15 are rotated in a low temperature rotation pattern.
[0057]
<Rotation pattern for low temperature>
(1) The washing motor 13 is rotated in the forward direction for 16 seconds at a speed of 50 rpm.
(2) The washing motor 13 is stopped for 4 seconds.
(3) The washing motor 13 is rotated in the reverse direction at a speed of 45 rpm for 16 seconds.
(4) The washing motor 13 is stopped for 4 seconds. Note that the two-dot chain line in FIG. 8B shows a rotation pattern for low temperature.
[0058]
According to the second embodiment, the reversing time of the drum 15 at the high water temperature is shortened compared to the low water temperature based on the fact that the washing time at the high water temperature at which bubbles are likely to be generated is shortened as compared with the low water temperature. For this reason, since it is prevented that the absolute extrusion amount of foam increases due to the difference in the washing environment (water temperature), it is possible to prevent the cleaning ability from deteriorating due to the adhesion of foam.
[0059]
In the first and second embodiments, the normal rotation time and reverse rotation time of the washing motor 13 when the water temperature is high are set to the same value, and the normal rotation speed and reverse rotation speed of the washing motor 13 when the water temperature is high. However, the present invention is not limited to this, and may be configured as (1) or (2) below. Also in the case of (1) or (2) below, the amount of foam extrusion is reduced, so the amount of foam adhering to the laundry after washing is reduced and the washing ability is increased.
[0060]
(1) The forward rotation speed and the reverse rotation speed of the washing motor 13 when the water temperature is high are set to the same “45 rpm”, and the normal rotation time and the reverse rotation time are changed to “16 seconds” and “10 seconds”.
(2) The forward rotation speed and the reverse rotation speed of the washing motor 13 when the water temperature is high are changed to “50 rpm” and “30 rpm”, and the normal rotation time and the reverse rotation time are changed to “16 seconds” and “12 seconds”.
[0061]
Moreover, in the said 1st and 2nd Example, although the normal rotation speed and reverse rotation speed of the washing motor 13 when water temperature is high were set to "50 rpm" and "40 rpm", it is not limited to this, For example, “50 rpm” and “30 rpm” may be set.
[0062]
In the first or second embodiment, the weight W of the laundry is detected before pouring water, and when the weight W is close to the rated load, the forward rotation speed of the washing motor 13 at the low water temperature and the positive speed at the high water temperature are detected. The rolling speed may be set to 60 rpm or more at which the squeezing is performed (a procedure for detecting the weight W of the laundry is shown in the third embodiment). In this case, although the laundry is packed in the drum 15 to such an extent that it cannot fall, the deformation of the laundry is urged by the centrifugal force, so that an agitation effect is produced and the cleaning performance during forward rotation is enhanced.
[0063]
Next, a third embodiment of the present invention will be described with reference to FIG. When the control device 53 detects an operation command in step S4 of FIG. 9A, the control device 53 proceeds to step S30 and accelerates the washing motor 13 to the set speed. Then, an acceleration drive signal having a constant duty ratio and a phase shift is output to the inverter circuit, and the washing motor 13 is accelerated by ΔR from the set speed with the phase shift as a corner angle. At this time, the acceleration time ΔT required for the washing motor 13 to accelerate by ΔR is detected, and the weight W of the laundry is detected based on the acceleration time ΔT.
[0064]
When the control device 53 detects the weight of the laundry, the process proceeds to step S5, and tap water or bath water at a set water level is injected into the water receiving tank 8. Then, the elapse of the washing time is determined in step S6, and the process proceeds to step S31. Here, the detected weight W in step S30 is compared with a reference value Wo recorded in advance. If “detected weight W <reference value Wo”, the process proceeds to step S8, and the washing motor 13 is set to a low value of “40 rpm” during reverse rotation. Rotate at speed. When “detected weight W ≧ reference value Wo”, the process proceeds to step S9, and the washing motor 13 is rotated at a high speed of “50 rpm” during the reverse rotation.
[0065]
According to the third embodiment, the reverse speed of the drum 15 is made slower when the laundry is lighter than when the laundry is heavy. When the weight is low, the amount of cloth is small with respect to the water level in the water receiving tank 8, and the amount of foam generated is larger than when the weight is high, but the foam extrusion rate is suppressed. For this reason, since the absolute amount of foam extrusion is prevented from increasing due to the difference in the washing environment (cloth amount), it is possible to prevent the cleaning ability from being lowered due to the adhesion of foam.
[0066]
In the third embodiment, the forward rotation time and the reverse rotation time of the washing motor 13 when the amount of cloth is small are set to the same value, and the normal rotation speed and the reverse rotation speed of the washing motor 13 when the amount of cloth is small. Although a difference is added, the present invention is not limited to this, and may be configured as (1) or (2) below. Also in the case of (1) or (2) below, the amount of foam extrusion is reduced, so the amount of foam adhering to the laundry after washing is reduced and the washing ability is increased.
[0067]
(1) The forward rotation speed and the reverse rotation speed of the washing motor 13 when the amount of cloth is small are set to the same “45 rpm”, and the normal rotation time and the reverse rotation time are changed to “16 seconds” and “10 seconds”.
(2) The forward rotation speed and the reverse rotation speed of the washing motor 13 when the fabric amount is small are changed to “50 rpm” and “30 rpm”, and the normal rotation time and the reverse rotation time are changed to “16 seconds” and “12 seconds”.
[0068]
In the third embodiment, the forward rotation speed and the reverse rotation speed of the washing motor 13 when the amount of cloth is small are set to “50 rpm” and “40 rpm”. However, the present invention is not limited to this. It may be set to “50 rpm” and “30 rpm”.
[0069]
Moreover, in the said 3rd Example, although the weight of the laundry was determined to two types, high weight and low weight, it is not limited to this, For example, it is three steps, rated weight, high weight, and low weight. You may judge. In this case, when the rated weight is determined, the rotation speed of the washing motor 13 at the forward rotation is set to a value at which the washing is performed, and the rotation speed at the reverse rotation is set to a value at which the washing is performed.
[0070]
Next, a fourth embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 11, a foam sensor 58 is fixed to the duct cover 38, and the foam sensor 58 is electrically connected to an input terminal of the control device 53. The bubble sensor 58 is composed of a transmission type optical sensor having a light projecting element 59 and a light receiving element 60. When a bubble is present between the light projecting element 59 and the light receiving element 60, the bubble sensor 58 corresponds to the amount of the bubble. The detection level of the light receiving element 60 changes.
[0071]
In the case of the above configuration, when the control device 53 determines that the washing time has elapsed in step S6 of FIG. 10A, the control device 53 proceeds to step S40 and operates the washing motor 13 and the drum 15 with the following rotation pattern for a small amount of foam. Rotate.
[0072]
<Rotation pattern for small amount of foam>
(1) The washing motor 13 is rotated in the forward direction for 16 seconds at a speed of 50 rpm.
(2) The washing motor 13 is stopped for 4 seconds.
(3) The washing motor 13 is rotated in the reverse direction at a speed of 45 rpm for 16 seconds.
(4) The washing motor 13 is stopped for 4 seconds. In addition, the dashed-two dotted line of (b) of FIG. 10 shows the rotation pattern for small amount of bubbles.
[0073]
When the washing motor 13 is rotated in step S40 of FIG. 10A, the control device 53 proceeds to step S41 and detects the foam amount V based on the output signal from the foam sensor 58. Then, the process proceeds to step S42, and the detected bubble amount V is compared with a reference value Vo recorded in advance.
[0074]
When the control device 53 detects “detected foam amount V ≦ reference value Vo” in step S42, the control device 53 returns to step S40 and operates the washing motor 13 with the rotation pattern for the small foam amount described above. Further, when “detected foam amount V> reference value Vo” is detected in step S42, the process proceeds to step S43, and the washing motor 13 is operated with the following rotation pattern for the large foam amount.
[0075]
<Rotation pattern for large amount of foam>
(1) The washing motor 13 is rotated in the forward direction for 16 seconds at a speed of 50 rpm.
(2) The washing motor 13 is stopped for 4 seconds.
(3) The washing motor 13 is rotated in the reverse direction at a speed of 40 rpm for 16 seconds.
(4) The washing motor 13 is stopped for 4 seconds. In addition, the continuous line of (b) of FIG. 10 shows the rotation pattern for the amount of foams in a graph.
[0076]
According to the fourth embodiment, when a large amount of foam exceeding the reference value Vo enters the duct cover 38, the reverse speed of the drum 15 is slowed down, so that the foam extrusion rate is suppressed. For this reason, it is possible to prevent an increase in the absolute amount of foam extrusion due to differences in various washing environments including water temperature and cloth amount, etc., thus preventing a reduction in cleaning performance due to foam adhesion. Is done.
[0077]
In the fourth embodiment, the forward rotation time and the reverse rotation time of the washing motor 13 are set to the same “16 seconds” when the amount of foam is small and when the amount of foam is large. However, the present invention is not limited to this. For example, the forward rotation speed and the reverse rotation speed may be set to the same value, and the forward rotation time and the reverse rotation time may be differentiated. Alternatively, the normal rotation speed and the reverse rotation speed may be changed, and the normal rotation time and the reverse rotation time may be changed.
[0078]
In the fourth embodiment, the forward rotation speed and the reverse rotation speed of the washing motor 13 when the amount of foam is large are set to “50 rpm” and “40 rpm”. However, the present invention is not limited to this. It may be set to “50 rpm” and “30 rpm”.
[0079]
Further, in the first to fourth embodiments, the drum 15 is disposed in a forwardly inclined state. However, the present invention is not limited to this, and may be disposed horizontally, for example.
[0080]
【The invention's effect】
  As is apparent from the above description, the drum type washing machine of the present invention has the following effects.
  According to the means of claim 1, a through hole is provided in a portion of the water receiving tank that is eccentric to the reverse side of the drum,The reverse rotation speed of the drum was slow compared to the normal rotation speed.For this reason, since the amount of foam extruded from the through-hole during washing is reduced, the amount of foam attached to the laundry after washing is reduced, and the washing ability is enhanced. Moreover,The degree to which the drum reverse rotation speed is slower than the normal rotation speed according to the difference in water temperature.I changed it. For this reason, the amount of foam generated due to the difference in water temperatureofDepending on the differenceBubblesAbsolute extrusion amountIncreaseIs prevented.
  According to the means of claim 2, a through hole is provided in a portion of the water receiving tank that is eccentric to the reverse side of the drum,When the detection result of the weight of the laundry before washing is smaller than the reference value, the reverse rotation speed of the drum is made slower than the normal rotation speed, and when the detection result of the weight of the laundry before washing is more than the reference value. Since the drum reverse rotation speed is the same as the normal rotation speed,At low weightIs highAlthough the amount of foam generated is larger than that at the time of weight, the foam extrusion rate is suppressed. For this reason, since it is prevented that the absolute extrusion amount of foam increases due to the difference in the amount of cloth, it is possible to prevent the cleaning ability from deteriorating due to the adhesion of foam.
[0081]
  According to the third aspect of the present invention, the stirring force of the laundry is increased based on rotating the drum in the forward direction for a long time during washing, and the tangling of the laundry is performed based on rotating the drum in the reverse direction for a short time. Can be loosened, so the cleaning ability is enhanced.
  According to the fourth aspect, the drum is rotated in the forward direction at a high speed at which the laundry can stick to the inner peripheral surface of the drum during washing. For this reason, even when the laundry is jammed to the extent that it cannot fall, the deformation of the laundry is urged by the centrifugal force, so that an agitation effect is produced and the washing performance during forward rotation is enhanced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a first embodiment of the present invention (a is a flowchart showing control contents of a control device, and b is a diagram showing a rotating state of a drum)
FIG. 2 is a diagram showing a washing process
FIG. 3 is a block diagram showing an electrical configuration.
FIG. 4 is a rear view showing the internal configuration of the washing machine with the rear plate removed.
FIG. 5 is a side view showing the internal structure of the washing machine in a broken state of the cabinet.
FIG. 6 is a top view showing the internal configuration of the washing machine with the top plate removed.
FIG. 7 is a diagram showing the relationship between the water temperature in the water receiving tank and the amount of bubbles generated, and the relationship between the water temperature in the water receiving tank and the cleaning power
FIG. 8 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
FIG. 9 is a view corresponding to FIG. 1 showing a third embodiment of the present invention.
FIG. 10 is a view corresponding to FIG. 1 showing a fourth embodiment of the present invention.
FIG. 11 is a diagram showing a bubble sensor in a broken state of a duct cover.
[Explanation of symbols]
8 is a water receiving tank, 13 is a washing motor, 15 is a drum, 37 is an air inlet (through hole), and 53 is a control device (control means).

Claims (4)

A water receiving tank into which washing water is injected;
A drum that is stored in the water receiving tub and into which laundry is put;
A washing motor for rotating the drum around a horizontal axis;
A through hole provided at the bottom of the water receiving tank and located at a portion eccentric to the reverse side of the drum;
A water temperature sensor for detecting the water temperature in the water receiving tank;
Controlling the rotation state of the drum based on driving and controlling the washing motor, comprising a control means for comparing the detection result of the water temperature sensor with a pre-recorded reference value at the time of washing,
The control means includes
During washing, rotates detection result is slower than the forward direction the drum be any if it is determined that the larger case and the reference value is determined to be equal to or less than the reference value in the opposite direction of the water temperature sensor Thus, the drum is rotated with a difference in both forward and reverse directions, and the reverse rotation speed when the drum rotates in the reverse direction is slower than the normal rotation speed when the drum rotates in the forward direction. The degree is changed according to the detection result of the water temperature sensor,
Wherein when the detection result of the water temperature sensor is equal to or less than the reference value, it reduces the degree to which the detection result of the temperature sensor is slow reverse speed of the drum as compared to when it is determined that greater than the reference value And
If the detection result of the water temperature sensor is determined to be larger than the reference value, it increases the degree to which the detection result of the temperature sensor is slow reverse speed of the drum as compared to when it is determined to be equal to or less than the reference value A drum-type washing machine characterized by that. A water receiving tank into which washing water is injected;
A drum that is stored in the water receiving tub and into which laundry is put;
A washing motor for rotating the drum around a horizontal axis;
A through hole provided at the bottom of the water receiving tank and located at a portion eccentric to the reverse side of the drum;
The rotation state of the drum is controlled based on driving control of the washing motor, and the weight of the laundry put in the drum is detected before washing , and the detection result is recorded in advance. A control means for comparing with a reference value ,
The control means includes
Whether to slow down the reverse rotation speed when the drum rotates in the reverse direction compared to the normal rotation speed when rotating in the forward direction during washing is determined according to the detection result of the weight,
If the weight of the detection result is determined to the reference value is smaller than is slower than the reverse rotation speed of the drum in the normal speed,
Drum type washing machine, characterized in that when the weight of the detection result is equal to or greater than the reference value is to the same as the forward speed reverse rotation speed of the drum.   The drum-type washing machine according to claim 1, wherein the control means rotates the drum in the forward direction for a long time from the reverse direction during washing.   The control means rotates the drum in the forward direction at a high speed at which the laundry sticks to the inner peripheral surface of the drum at the time of washing, and rotates at a low speed at which the laundry falls in the reverse direction. The drum-type washing machine according to 1.

Images