JP2008194090A - Washing machine - Google Patents

Abstract

Abnormal vibration can be prevented even if various types of clothes are washed together.
A rotating drum 3 type washing machine includes a water tank 2 accommodated in a box, a drain valve 40 connected to the water tank 2, a rotating drum 3 rotatably supported in the water tank 2, and a washing tank. A drive motor 4, an acceleration sensor 109, a rotation detection sensor, and a control circuit 5 are included. During the dehydrating operation, the control circuit 5 controls the washing tub drive motor 4 so that the rotational speed of the rotary drum 3 increases until at least one of the vibration requirement and the rotational speed requirement is satisfied. When at least one of the vibration requirement and the rotation speed requirement is satisfied and the vibration component detected by the acceleration sensor 109 exceeds the lower setting value while the rotary drum 3 is rotating, the control circuit 5 The washing tub drive motor 4 is controlled so that the rotational speed of 3 decreases.
[Selection] Figure 2

Description

  The present invention relates to a washing machine, and more particularly, to a washing machine that performs electrical continuous operation control for dehydration according to the number of rotations of a rotating drum during dehydration.

  In recent years, the spread of laundry dryers having a drying function added to the laundry machines has shown remarkable growth. With the widespread use of washing and drying machines, shortening the operation time has become an important issue. In order to shorten the operation time of the drum-type washing / drying machine among the washing / drying machines, it is important how efficiently the dehydration operation is performed while suppressing vibration during dehydration.

  In order to perform dehydration, it is necessary to increase the rotational speed of the rotating drum. However, if the rotational speed of the rotating drum is increased, vibration and noise are generated depending on the state of the laundry. As one method for increasing the rotational speed of the rotary drum while reducing the vibration and noise, the invention according to Patent Document 1 has been proposed.

  Patent Document 1 discloses a drum-type washing machine having a washing process for rotating a drum at a low speed and a dewatering process by a high-speed rotation and performing a loosening operation by a low-speed rotation at the time of the dehydration process. The drum type washing machine includes a motor for driving the drum, a drive circuit, a vibration detection switch, a drum rotation number sensor, and a control circuit for controlling the progress of the process. The drive circuit is driven by changing the rotation speed of the motor. The vibration detection switch detects abnormal vibration of the drum. The drum rotation speed sensor detects the rotation speed when abnormal vibration occurs. When the detected rotational speed detected by the rotational speed sensor is lower than the predetermined rotational speed, the control circuit performs the low-speed rotational loosening operation again. When the detected rotational speed is high, the control circuit reduces the detected rotational speed by about 3 to 5%. The dehydration process is controlled at the set rotational speed.

According to the invention disclosed in Patent Document 1, even if the vibration detection switch is activated after the dehydration process is started and the laundry is loosened by low-speed rotation, the occurrence of abnormal vibration can be prevented thereafter.
JP-A-5-184769

  However, the invention disclosed in Patent Document 1 has a problem that abnormal vibration may occur when clothes of different types are washed.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a washing machine capable of preventing abnormal vibration even when various types of clothes are washed together.

  In order to achieve the above object, according to one aspect of the present invention, a washing machine includes a water tank accommodated in a box, a drain valve connected to the water tank, a drum rotatably supported in the water tank, A drive means, a vibration detection means, a rotation speed detection means, and a control means are included. The driving means is connected to the drum and drives the drum to rotate. The vibration detecting means detects a vibration component of the water tank. The rotation speed detection means detects the rotation speed of the drum. The control unit controls the driving unit. The control means includes acceleration control means and deceleration control means. The acceleration control means controls the drive means so that the rotation speed of the drum is increased during the dehydration operation until at least one of the vibration requirement and the rotation speed requirement is satisfied. The dehydrating operation means an operation in which the drum rotates with the drain valve opened. The vibration requirement means a requirement that the magnitude of the vibration component detected by the vibration detection means is equal to or greater than the increase set value. The increase setting value is a value for determining whether to increase the rotational speed. The rotational speed requirement is a requirement that the rotational speed of the drum is equal to or greater than a threshold value. When at least one of the vibration requirement and the rotation speed requirement is satisfied and the vibration component detected by the vibration detection means exceeds the lower set value while the drum is rotating, the deceleration control means The driving means is controlled so as to decrease. The decrease set value is a value for determining whether to decrease the rotational speed.

  The deceleration control means described above preferably includes a decrease control means. The reduction control means controls the drive means so that the drum rotation speed is reduced at a constant rate when the vibration component detected by the vibration detection means exceeds the reduction set value while the drum is rotating.

  Further, the deceleration control means described above preferably includes a requirement determination means and a suppression control means. The requirement determining means determines whether or not the vibration component detected by the vibration detecting means exceeds the set lower value than the specific rotation speed. The specific rotation speed is a rotation speed for determining whether or not the rotation speed of the drum decreases the rotation speed. The suppression control means controls the driving means so that the drum rotation speed decreases when the drum rotation speed is equal to or higher than the specific rotation speed and the vibration component detected by the vibration detection means exceeds the lower set value.

  Alternatively, the suppression control means described above is a means for controlling the drive means so that the rotation speed of the drum decreases at a rate corresponding to the rotation speed when the vibration component detected by the vibration detection means exceeds the decrease set value. It is desirable to include.

  In the above deceleration control means, the elapsed time after the time when at least one of the vibration requirement and the rotation speed requirement is satisfied exceeds a threshold, and the vibration component detected by the vibration detection means exceeds the lower set value. In this case, it is desirable to include means for controlling the driving means so that the number of revolutions of the drum is reduced.

  The washing machine described above preferably further includes a cooling means, a heating means, and a supply means. The cooling means cools the air inside the water tank. The heating means heats the air whose water vapor amount has decreased due to the cooling means cooling the air. The supply means supplies the air heated by the heating means to the inside of the drum. It is desirable that the control means further includes an end control means and a drying control means. The end control means stops the rotation of the drum when an elapsed time after at least one of the vibration requirement and the rotation speed requirement exceeds a threshold for determining whether or not to end the dehydration operation. The driving means is controlled. When the end control means controls the driving means so as to stop the rotation of the drum, the drying control means cools the air flowing out from the inside of the drum to the inside of the water tank, and heats the air whose water vapor amount is reduced by the cooling, The cooling means, the heating means, and the supply means are controlled so as to supply the heated air to the inside of the drum.

  The washing machine according to the present invention can prevent abnormal vibration even when various types of clothes are washed together.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

<First embodiment>
Hereinafter, the drum type washing machine according to the first embodiment of the present invention will be described.

  FIG. 1 is a perspective view showing an appearance of the drum type washing machine according to the present embodiment. FIG. 2 is a cross-sectional view showing the inside of the drum type washing machine according to the present embodiment. FIG. 3 is a cross-sectional view showing the vicinity of the water tub 2 of the drum type washing machine according to the present embodiment. With reference to FIGS. 1-3, the structure and operation | movement of the drum type washing machine which concern on this Embodiment are demonstrated.

  As shown in FIG. 1, the drum type washing machine has a box 1 having a substantially rectangular parallelepiped shape as a casing. The box body 1 is provided with a top plate 8 at the top, and supports the entire weight with a bottom base 7 at the bottom. There is an opening on the front surface of the box 1, and a side-opening door 10 attached to the box 1 with a hinge (not shown) closes the opening. An operation panel 11 is provided on the top of the box 1.

  In the box 1, a cylindrical water tank 2 having a water tank opening 60 and a bottom is disposed substantially laterally toward the front. Further, a cylindrical rotating drum 3 having a drum opening 66 and having a bottom so as to be rotatable around a shaft portion is supported inside the water tank 2. The rotating drum 3 stores laundry to be washed and dried. A washing tub drive motor 4 that rotationally drives the shaft portion of the rotary drum 3 is disposed on the back surface of the water tub 2. The diameter of the drum opening 66 is larger than the diameter of the water tank opening 60.

  The aquarium 2 and the rotating drum 3 have an axis formed at an angle of 5 ° to 30 ° with respect to a horizontal plane by a suspension 6 comprising a combination of a tension coil spring and an anti-vibration damper, and the sides of the aquarium opening 60 and the drum opening 66 are It is supported in the box 1 so as to be lifted. This is to make it easy to see the inside of the rotary drum 3 and to easily take in and out the laundry.

  The support position of the vibrating body by the suspension 6 is in the vicinity of the center of gravity of the entire vibrating body. The suspension 6 supports the vibrating body and plays a role of attenuating the vibration. In the case of the present embodiment, the water tank 2 is not suspended from the top with respect to the box body 1 by a spring. Incidentally, the “vibrating body” is a general term for the water tub 2, the rotating drum 3, and the washing tub drive motor 4.

  The steps of washing, rinsing, dewatering and drying are executed by rotating the rotary drum 3 with the washing tub drive motor 4. At this time, if an unbalance of the laundry occurs in the rotating drum 3, a centrifugal force is applied, the suspension 6 expands and contracts, and the vibrating body is displaced. Each time the vibrating body is displaced, the suspension 6 tries to return the vibrating body to a predetermined position, and the vibrating body repeats displacement and return, and consequently vibrates.

  A door packing 15 made of soft synthetic resin or rubber is provided around the water tank opening 60. When the door 10 is closed, the projecting portion 70 comes into close contact with the inner periphery of the door packing 15. Thereby, the clearance gap between the protrusion part 70 and the door packing 15 is closed. By closing the gap, water splashed in the rotating drum 3 during washing, water generated in the rotating drum 3 during drying, and the like are not leaked from the water tank 2 to the outside. The protrusion 70 also serves to prevent the laundry in the rotating drum 3 from protruding from the water tank opening 60.

  A number of small holes 64 are formed in the peripheral wall of the rotating drum 3. During washing, washing water flows back and forth between the rotary drum 3 and the water tank 2 through the small hole 64, and during dehydration, water separated from the laundry is discharged out of the rotary drum 3 through the small hole 64, At the time of drying, it functions as a vent for the warm air blown from the blow-out port 88 to go out of the rotating drum 3. A plurality of baffles 68 are provided at predetermined intervals on the inner peripheral surface of the rotating drum 3. The baffle 68 plays a role of catching and lifting the laundry along with the rotation of the rotating drum 3 and dropping (tumbling) the laundry from the upper side.

  A fluid balancer 62 is provided at a portion surrounding the drum opening 66 of the rotary drum 3. A fluid such as salt water is sealed inside the fluid balancer 62. Hereinafter, this fluid is referred to as “filled fluid”. When the rotating drum 3 rotates, the center of gravity movement of the entire rotating drum 3 due to the bias of the laundry and the washing liquid is canceled by the movement of the sealed fluid.

  A washing tub drive motor 4 is attached to the outer surface of the bottom of the water tank 2 (the surface facing the water tank opening 60). The washing tub drive motor 4 is of a direct drive type, and the shaft of the rotary drum 3 is connected and fixed to the rotor.

  A water supply device is disposed in the space between the top plate 8 and the upper outer surface of the water tank 2. The water supply apparatus is constituted by a tap water supply channel 12 having a washing water supply valve 38 that opens and closes electromagnetically. The washing water supply valve 38 has a plurality of output ports, one of which is connected to a detergent case 45 disposed under the top plate 8. The detergent case 45 has a discharge port at the bottom, and this discharge port is connected to the water tank 2 via the water supply duct 42.

  The box 1 has a step portion 9 that is one step lower than the top plate 8 at the rear portion of the top plate 8. The tap hose connection portion of the tap water supply channel 12 protrudes from the stepped portion 9.

  A drain port 48 is provided at the lowest point of the water tank 2, and one end of the drain duct 18 is connected to the drain port 48. The other end of the drain duct 18 is connected to the filter device 17. The filter device 17 incorporates a lint filter made of a synthetic resin net or cloth and collects lint in the water.

  A drain hose 20 and a circulation hose 46 are connected to the outlet side of the filter device 17. The drain hose 20 is for discharging the water that has passed through the lint filter out of the box 1, and the circulation hose 46 is for returning the water that has passed through the lint filter to the water tank 2. The drainage hose 20 is provided with a drainage valve 40, and the drainage motor 21 opens and closes it. A circulation pump 39 is provided at the inlet of the circulation hose 46. The outlet of the circulation hose 46 is connected to a nozzle 47 installed at the lower front part of the water tank 2.

  A blower 50 is attached to the bottom of the water tank 2. The fan motor 51 of the blower 50 is attached to the outside of the water tank 2, and the blower fan 52 is disposed inside the water tank 2. The blower fan 52 is a centrifugal fan, and is fixed to a motor shaft 53 protruding inside the water tank 2. A water-tight seal structure is formed at a location where the motor shaft 53 penetrates the water tank 2.

  The blower 50 is disposed at a position closer to the left than the center of the water tank 2 when the water tank 2 is viewed from the front, and feeds air into the heating device 80 disposed in the overhanging portion of the water tank 2. When the water tank 2 is viewed from the front, the heating device 80 is disposed at a position closer to the right than the center of the water tank 2, and includes a blower duct 82 and a heater case 84 disposed inside the blower duct 82. The heater 86 is supported in the heater case 84.

  One end of the air duct 82 is connected to the fan casing 54, and the other end is connected to an outlet 88 provided below the edge of the water tank opening 60. The outlet 88 is directed to the drum opening 66, and the hot air generated by the heating device 80 is blown into the rotating drum 3 through the drum opening 66.

  A dehumidifying device 90 is arranged on the lower inner peripheral wall of the water tank 2 in a line with the heating device 80. The dehumidifier 90 extends obliquely at the same angle as the water tank 2 and is disposed so as to surround the condensing plate 92 supported at an interval from the inner peripheral wall of the water tank 2, and has an inlet at the water tank 2 and the rotating drum. 3, a ventilation duct 94 whose outlet is connected to the fan casing 54 and a cooling nozzle (not shown) arranged at the front end of the condensing plate 92.

  The condensing plate 92 is formed of a metal plate having good heat conductivity, and has a cross-sectional shape that is engineeringly defined as an open cross-section, such as a trough shape or an H shape. The cooling nozzle is connected to a hose (not shown) connected to one of the output ports of the washing water supply valve 38. When this output port is opened, water flows out from the cooling nozzle. Water flows along the upper surface of the condensing plate 92 and is finally discharged from the drain port 48.

  Further, a control circuit 5 is disposed on the back side of the operation panel 11. The control circuit 5 controls the washing operation of the drum type washing machine.

  A general-purpose biaxial acceleration sensor 109 is attached to the upper outer surface of the water tank 2 as the vibration detection unit 104. The acceleration sensor 109 outputs an electrical signal proportional to the magnitude of acceleration. As shown in FIG. 4, the acceleration sensor 109 can detect accelerations in the X direction and the Y direction that are orthogonal to each other in the same plane with respect to the package of the acceleration sensor 109. The position where the acceleration in each direction is most easily detected differs depending on the manner in which the water tank 2 is fixed to the box 1, so even if two uniaxial acceleration sensors are attached (for example, the front end and the back end of the water tank 2). Good.

  FIG. 5 is a control block diagram of the washing / drying machine according to the present embodiment. A main component of the control circuit 5 is a microcomputer 22. The microcomputer 22 includes a CPU (Central Processing Unit) 23, a RAM (Random Access Memory) 24, a ROM (Read Only Memory) 25, a timer 26, and a plurality of I / O (Input / Output). ) Port 27 and system bus 28. The microcomputer 22 operates when a constant voltage is supplied from the power supply circuit 31 to the power supply terminals Vdd and Vss, and can be reset by a signal input from the reset circuit 32 to the RESET terminal.

  The CPU 23 includes a control unit 29 and a calculation unit 30. The control unit 29 takes out an instruction stored in the ROM 25 and executes the instruction. The arithmetic unit 30 performs operations such as binary addition, logical operation, increase / decrease, and comparison on data input from various input devices and the RAM 24 based on a control signal given from the control unit 29 at the execution stage of the instruction. . Therefore, the ROM 25 stores in advance a control program for operating various devices, conditions set for various determinations, rules for processing various information, and the like.

  The microcomputer 22 is connected to an input key circuit 33, a state detection circuit 34, a display device drive circuit 35, a buzzer drive circuit 36, and a load drive circuit 37 via a plurality of I / O ports 27. Yes. The microcomputer 22 performs calculations based on input signals input from the input key circuit 33 and the state detection circuit 34, and outputs control signals to the display device drive circuit 35, the buzzer drive circuit 36, and the load drive circuit 37. To do.

  The input key circuit 33 is connected to the operation panel 11 having various operation buttons (not shown).

  The state detection circuit 34 includes an unbalance detection unit 100 that detects whether the laundry distribution in the rotary drum 3 is in an unbalanced state, a vibration detection unit 104 that detects a vibration component of the water tank 2, and the rotation drum 3. A rotation detection sensor 105 that detects the number of rotations (a hall sensor or a tachometer can be used as the rotation detection sensor 105), a blow-out temperature control unit 106 for ON / OFF control of the heater 86, and a water level sensor 107 And an internal temperature detection unit 108 for detecting the capacity and dry state of the laundry.

  In the case of the present embodiment, a current transformer that detects the amount of change in the current value of the washing tub drive motor 4 is used as the unbalance detection unit 100. However, in the case of adopting a method of performing an unbalance determination based on variations in the number of rotations of the washing tub drive motor 4, a hall sensor or a tachometer used as the rotation detection sensor 105 may be used for the unbalance determination. In this case, a sensor that operates only as the unbalance detection unit 100 is not necessary.

  In dehydration, the rotational speed of the rotating drum 3 varies over a wide range from low speed to high speed. Therefore, the imbalance of the laundry in the rotating drum 3 is detected using the operation state at the low speed rotation at the time of dehydration. Preferably it is done. While rotating the rotating drum 3 at a low speed (critical speed) that allows the laundry to stick to the inner surface of the peripheral wall, unbalance detection is performed to detect the amount of eccentricity that is the magnitude of the eccentric load of the rotating drum 3. If the amount is below the reference value, the rotary drum 3 can be shifted to high speed rotation as it is. The washing liquid and the rinsing water contained in the laundry are discharged in such a manner that the laundry is pressed against the inner surface of the peripheral wall of the rotary drum 3 by using the centrifugal force during the high-speed rotation operation of the rotary drum 3. At this time, the washing liquid and the rinsing water are blown out from the small hole 64 of the rotary drum 3 and guided to the lower part through the inner surface of the water tank 2, and from the drain port 48 to the drain duct 18, the filter device 17, the drain hose. 20 is discharged to the outside. On the other hand, if it is determined that imbalance is detected when the imbalance of the rotating drum 3 is detected, the rotation of the rotating drum 3 is stopped, and the process returns to the beginning of the dehydration process to detect imbalance. When abnormal vibration is detected during dehydration, operation control is performed according to the state at that time, which will be described in detail later.

  The display device drive circuit 35 is connected to the display device 102 and drives the display device 102.

  The buzzer drive circuit 36 is connected to the buzzer 103, and is used to sound the buzzer 103 to notify the user when the key input is completed, when the operation is completed, and when an abnormality occurs.

  The load driving circuit 37 is connected to the washing tub driving motor 4, the drain motor 21, the washing water supply valve 38, the circulation pump 39, the blower 50, and the heater 86, and drives them.

  FIG. 6 is a functional block diagram of the control circuit 5 according to the present embodiment. Referring to FIG. 6, control circuit 5 according to the present embodiment includes information storage unit 200, washing process control unit 202, rinsing process control unit 204, dehydration process control unit 206, and drying process control unit 208. Including.

  The information storage unit 200 stores a rotation chart and various threshold values. In the present embodiment, the rotation chart means information indicating the control content for the rotation of the rotary drum 3.

  The washing process control unit 202 controls the washing tub drive motor 4, the washing water supply valve 38, and the drain valve 40 so as to perform a washing process described later.

  The rinsing process control unit 204 controls the washing tub drive motor 4, the washing water supply valve 38, the circulation pump 39, and the drain valve 40 so as to perform a rinsing process described later.

  The dehydration process control unit 206 controls the washing tub drive motor 4, the washing water supply valve 38, and the drain valve 40 so as to perform a dehydration process described later.

  The drying process control unit 208 controls the washing tub drive motor 4, the washing water supply valve 38 (and thus the cooling nozzle), the fan motor 51, and the heater 86 so as to perform a drying process described later.

  The dehydration process control unit 206 includes an unbalance determination unit 220, an acceleration control unit 222, a deceleration control unit 224, and an end control unit 226.

  Based on the signal output from the unbalance detection unit 100, the unbalance determination unit 220 determines whether the clothing (laundry) accommodated in the rotary drum 3 is unevenly arranged.

  The acceleration controller 222 controls the washing tub drive motor 4 so that the rotational speed of the rotary drum 3 increases until at least one of the vibration requirement and the rotational speed requirement is satisfied during the dehydrating operation. In the present embodiment, “dehydration operation” means an operation in which the rotary drum 3 rotates with the drain valve 40 opened. In the present embodiment, the “vibration requirement” means a requirement that the magnitude of the vibration component detected by the vibration detection unit 104 is equal to or greater than a threshold value. This threshold value is a threshold value for the vibration component for determining whether to increase the rotational speed. In the present embodiment, the “revolving speed requirement” is a requirement that the rotational speed of the rotating drum 3 is equal to or greater than a threshold value. This threshold value is a threshold value for the rotational speed for determining whether to increase the rotational speed.

  When at least one of the vibration requirement and the rotation speed requirement is satisfied and the vibration component detected by the vibration detection unit 104 exceeds the threshold value while the rotation drum 3 is rotating, the deceleration control unit 224 The washing tub drive motor 4 is controlled so that the rotational speed of 3 decreases. This threshold value is a threshold value for the vibration component for determining whether or not to decrease the rotation speed.

  When the elapsed time after the time when at least one of the vibration requirement and the rotation speed requirement is satisfied exceeds the threshold for determining whether or not to end the dehydration operation, the end control unit 226 rotates the rotary drum 3. The washing tub drive motor 4 is controlled so as to be stopped.

  Next, the operation performed by the drum type washing machine according to the present embodiment will be described. The drum type washing machine according to the present embodiment executes a course set by input to the operation panel 11. This course includes multiple steps.

  First, the user opens the door 10 and puts the laundry into the rotating drum 3. The detergent case 45 is filled with detergent.

  After the preparation of the detergent is prepared, the door 10 is closed, the power on / off key (not shown) of the operation panel 11 is pressed to supply power, and the start key (not shown) is pressed. The operation of the drum type washing machine according to the embodiment starts.

  In this explanation, the operation of the drum type washing machine is a standard course that has been set in advance (for laundry other than special laundry such as blankets and wool products, the quantity, fabric quality, water level, etc. are automatically judged and Will be performed in the course of automatic operation from dehydration to dehydration).

  First, the washing process will be described. When the operation is started, the washing water supply valve 38 is opened and water supply is started. Water is poured into the water tank 2 from the water supply duct 42 while dissolving the detergent in the detergent case 45. Water that has entered the water tank 2 enters the rotating drum 3 through the small holes 64. Since the drain valve 40 is closed, no water is discharged.

  When the water level sensor 107 detects that the water has reached a preset water level, the washing water supply valve 38 is closed. Then, the operation of washing the laundry is actually started.

  The first is the “familiar tumbling” stage, in which the rotating drum 3 rotates at a low speed. The laundry is lifted from the water at a slow pace and falls back into the water. This movement of the laundry is "tumbling". The purpose of “familiarizing tumbling” is to allow the laundry to sufficiently absorb water and to release air trapped in various parts of the laundry.

  After “Family tumbling” is completed, the process proceeds to the “wash tumbling” stage. The rotating drum 3 rotates at a slightly higher speed than that of the “familiar tumbling”, and the laundry is lifted and dropped. Due to the impact at the time of dropping, a jet of water in which the detergent is dissolved is generated between the fibers of the laundry, and the laundry is washed.

  The circulation pump 39 is operated during the “wash tumbling”. As a result, the water in the water tank 2 circulates through the path of the water tank 2, the drainage duct 18, the filter device 17, the circulation pump 39, the circulation hose 46, and the water tank 2. Even in the case of rinsing, the circulation pump 39 is similarly operated.

  After the “washing tumbling” is completed, the process proceeds to the “balance process” (in this embodiment, the balance process is a part of the washing process). In the “balance step”, the rotating drum 3 is gently rotated to loosen the laundry and prepare for intermediate dehydration.

  In the intermediate dehydration, the circulation pump 39 stops operation, and the drain motor 21 opens the drain valve 40. Thereby, the water in the aquarium 2 is drained outside the machine through the drainage hose 20.

  Unbalance detection is performed when a predetermined time has elapsed and most of the water has been removed from the laundry. In the unbalance detection, the rotating drum 3 is rotated at a rotation speed at a low speed but at a speed at which the laundry is stuck to the inner peripheral surface thereof and does not fall, and in this state, the eccentricity representing the magnitude of the eccentric load of the rotating drum 3 is detected. The core amount is detected by the unbalance detection unit 100, and this is set as the unbalance amount. If the unbalance amount is equal to or less than a predetermined value, it is determined that no significant vibration is generated even if the rotating drum 3 is rotated at a high speed, and the rotating drum 3 is shifted to a high speed rotation.

  When the rotating drum 3 rotates at a high speed, the laundry is pressed against the inner peripheral surface of the rotating drum 3 by centrifugal force. The washing water contained in the laundry is spun off by the centrifugal force from the small hole 64, falls along the inner surface of the water tank 2, and is drained outside the machine through a drainage path connected from the drainage port 48. When the time allotted to the intermediate dehydration has passed, the washing tub drive motor 4 is stopped, the drain valve 40 is closed, and the water tank 2 is ready to be rinsed.

  Next, the rinsing process will be described. Rinse water is supplied at the place where the rinse water is ready. When the water level in the water tank 2 reaches the set water level for rinsing, water supply is stopped and rinsing is started.

  First, there is a “familiar tumbling” stage as in washing, and then the “rinse tumbling” stage. The rotating drum 3 lifts the laundry through the water and drops it. As a result, the laundry is rinsed.

  After the “rinse tumbling” is completed, the process proceeds to the dehydration process through the “balance process” (this balance process is a part of the rinse process) in the same manner as the washing process.

  The operation in the dehydration process is the same as the intermediate dehydration described above. Incidentally, in the present embodiment, the operation performed in the intermediate dehydration and the operation performed in the dehydration process are both types of dehydration operations. When the dehydration process is completed, the process proceeds to the drying process.

  Next, the drying process will be described. In the drying process, the heater 86 is energized while rotating the rotary drum 3 to drive the blower 50. The blower 50 sucks the air in the water tank 2 and sends it to the heating device 80, so that it passes through the heater case 84 and is heated by the heater 86 in the heater case 84 to become warm air. The warm air is blown into the rotary drum 3 through the blower duct 82 and from the outlet 88, and touches the laundry tumbling in the rotary drum 3 to take away moisture. The warm air deprived of moisture exits from the small hole 64 and returns to the blower 50 through the ventilation duct 94 of the dehumidifier 90. When air passes through the ventilation duct 94, the amount of water vapor in the air decreases due to condensation of moisture. That is, the air in the water tank 2 circulates along the path of the blower 50, the heating device 80, the rotary drum 3, the dehumidifying device 90, and the blower 50, and takes away moisture from the laundry in the process. After drying is completed, the process proceeds to the “blowing process”.

  Next, the air blowing process will be described. The air blowing process is performed to cool the laundry after drying, and the blower 50 is operated while the laundry is tumbled (the heater 86 is not energized). When the laundry is sufficiently cooled, Stop. Then, the door 10 is unlocked and the laundry can be taken out.

  Referring to FIG. 7, the program executed by control circuit 5 performs the following control regarding the dehydration process. Incidentally, in the case of the present embodiment, the control shown in FIG. 7 is also executed during intermediate dehydration. However, conditions such as dehydration time differ during intermediate dehydration.

  In step S <b> 201, the load driving circuit 37 that operates as the unbalance determination unit 220 controls the washing tub drive motor 4 during the period stored in the ROM 25 that operates as the unbalance determination unit 220, thereby gently rotating the rotating drum 3. Rotate. Thereby, the laundry in the rotating drum 3 is loosened. This operation is a loosening operation. When the unraveling operation is finished, the load driving circuit 37 operating as the unbalance determination unit 220 controls the washing tub driving motor 4 to rotate the rotating drum 3 at a low speed (about 110 rpm is desirable) in order to detect imbalance. ) While the rotary drum 3 rotates at a low speed, the unbalance detection unit 100 detects the eccentricity. The detected eccentricity amount is output to the state detection circuit 34 that operates as the unbalance determination unit 220.

  In step S202, the CPU 23 operating as the unbalance determination unit 220 determines whether or not the eccentricity output to the state detection circuit 34 operating as the unbalance determination unit 220 is equal to or less than a reference value. If it is determined that the amount of eccentricity is equal to or less than the reference value (YES in step S202), the process proceeds to step S203. If not (NO in step S202), the process proceeds to step S204.

  In step S <b> 203, the CPU 23 that operates as the acceleration control unit 222 outputs a control signal to the load drive circuit 37 that operates as the acceleration control unit 222. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the rotational speed of the rotary drum 3 increases. This is because the swirl is expected to be small even when the rotating drum 3 rotates at a high speed. As a result, the rotation of the rotary drum 3 shifts to high speed rotation.

  In step S <b> 204, the CPU 23 that operates as the unbalance determination unit 220 outputs a control signal to the load drive circuit 37 that operates as the unbalance determination unit 220. When the control signal is output, the load driving circuit 37 controls the washing tub driving motor 4 so that the rotating drum 3 stops rotating. This is because the swirl of the rotating drum 3 is expected to be large.

  In step S <b> 205, the CPU 23 that operates as the acceleration control unit 222 stores the output value output from the vibration detection unit 104 to the state detection circuit 34 that operates as the acceleration control unit 222 in the ROM 25 that operates as the acceleration control unit 222. It is determined whether or not the increase set value or less. If it is determined that the output value is equal to or less than the increase set value (YES in step S205), the process proceeds to step S206. If not (NO in step S205), the process proceeds to step S207.

  In step S <b> 206, the CPU 23 operating as the acceleration control unit 222 stores the rotational speed output from the rotation detection sensor 105 to the state detection circuit 34 operating as the acceleration control unit 222 in the ROM 25 operating as the acceleration control unit 222. It is determined whether or not it is equal to or higher than the rated rotational speed (1100 rpm in the case of the present embodiment). If it is determined that the rotational speed is equal to or higher than the rated rotational speed (YES in step S206), the process proceeds to step S208. If not (NO in step S206), the process proceeds to step S203.

  In step S207, the CPU 23 operating as the acceleration control unit 222 outputs a control signal to the load driving circuit 37 operating as the acceleration control unit 222. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the increase in the rotation speed of the rotary drum 3 is stopped.

  In step S <b> 208, the CPU 23 that operates as the deceleration control unit 224 outputs a control signal to the load drive circuit 37 that operates as the deceleration control unit 224. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the increase in the rotation speed of the rotary drum 3 is stopped.

  In step S209, the CPU 23 that operates as the deceleration control unit 224 stores the output value output from the vibration detection unit 104 to the state detection circuit 34 that operates as the deceleration control unit 224, in the ROM 25 that operates as the deceleration control unit 224. It is determined whether or not it is equal to or less than the lower set value. If it is determined that the output value is equal to or lower than the lower set value (YES in step S209), the process proceeds to step S210. If not (NO in step S209), the process proceeds to step S211.

  In step S <b> 210, the CPU 23 that operates as the deceleration control unit 224 outputs a control signal to the load drive circuit 37 that operates as the deceleration control unit 224. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the rotation speed of the rotary drum 3 is maintained.

  In step S <b> 211, the CPU 23 that operates as the deceleration control unit 224 outputs a control signal to the load drive circuit 37 that operates as the deceleration control unit 224. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the number of rotations of the rotary drum 3 decreases. The decreasing speed corresponds to a value stored in the ROM 25 that operates as the deceleration control unit 224. In the case of the present embodiment, the reduction speed is -5 rpm / second.

  In step S212, the CPU 23 that operates as the end control unit 226, based on the elapsed time measured by the timer 26 that operates as the end control unit 226, the elapsed time after the rotation of the rotary drum 3 is started. It is determined whether or not the rated dehydration time stored in the ROM 25 operating as If it is determined that the rated dehydration time has been exceeded (YES in step S212), the process ends. A drying process is started after completion | finish of a process. If not (NO in step S212), the process proceeds to step S209.

  The operation of the drum type washing machine based on the above-described structure and flowchart will be described.

  After passing through the loosening process, the rotating drum 3 rotates at a low speed in order to detect imbalance (step S201). Therefore, it is determined whether or not the eccentricity amount is equal to or less than a reference value (step S202).

  If the eccentric amount is less than the reference value, even if the rotary drum 3 rotates at a high speed, the runout is expected to be small. If the eccentric amount is less than the reference value, the dehydration process control unit 206 Then, the rotational speed of the rotary drum 3 is increased (step S203), and the process shifts to high speed rotation.

  On the other hand, when the amount of eccentricity exceeds the reference value, the rotation of the rotating drum 3 is expected to be large, so that the rotation of the rotating drum 3 is stopped (step S204). Thereafter, the process returns to the loosening step (step S201) again.

  After shifting to the high speed rotation, the CPU 23 determines whether or not the output value of the vibration detection unit 104 is equal to or less than the increase set value (step S205). After that, if the rotational speed of the rotating drum 3 reaches the rated rotational speed without the output value of the vibration detection unit 104 exceeding the increase set value (step S206), the rotational of the rotating drum 3 is continued for the rated time (step S206). S208 to step S212), the process proceeds to the drying process.

  Further, when it is determined whether or not the output value of the vibration detection unit 104 is equal to or less than the increase set value (step S205), if the output value of the vibration detection unit 104 exceeds the increase set value, the increase in the rotational speed at that time is Stopped (step S207). Then, after the rotation is continued for the rated time at the reached rotation speed at that time (steps S208 to S212), the process proceeds to the drying process.

  On the other hand, when the rotation speed of the rotating drum 3 is once determined and the output value of the vibration detecting unit 104 exceeds the lower set value during the dehydration operation (step S208) (step S209), a constant speed (−5 rpm / sec), the rotational speed of the rotary drum 3 is decreased (step S211). The decrease in the rotation speed is continued until it falls below the lower set value. Thereafter, after the rotation is continued for the rated time (steps S209 to S212), the process proceeds to the drying process.

  As described above, the drum type washing machine according to the present embodiment maintains the number of revolutions after the number of revolutions of the rotating drum 3 at the time of dehydration is determined so that the number of revolutions is equal to or less than a predetermined rated number of revolutions. If the output value of the vibration detection unit 104 exceeds the specified decrease set value in the middle of continuing the dehydrating operation, the rotation speed is continuously decreased until it falls below the decrease set value. Thereby, a dehydration process is implemented at the rotation speed which can perform a dehydration operation safely.

  FIG. 8 is a diagram showing control of the dehydrating operation in the drum type washing machine according to the present embodiment. First, a process of loosening the laundry at an extremely low speed of about 50 rpm is provided. In FIG. 8, the part where the rotational speed transitions in an uneven shape is the process. Thereafter, the rotating drum 3 is rotated at a critical rotational speed of 110 rpm (strictly, a rotational speed slightly faster than 110 rpm) at which tumbling occurs, and unbalance detection is performed. In FIG. 8, the portion where the rotation speed remains at about 110 rpm indicates the period during which unbalance detection is performed. When it is determined that the amount of eccentricity exceeds the reference value, the unbalance determination unit 220 reduces the number of rotations of the rotating drum 3 and loosens the laundry again, and then performs unbalance detection again. When it is determined that the eccentricity amount is equal to or less than the reference value, the acceleration control unit 222 determines that the laundry is less biased and increases the rotational speed of the rotary drum 3. After that, when the acceleration control unit 222 determines that the vibration exceeds the preset value stored in advance before reaching the predetermined rated speed 1100 rpm, the dehydration is performed while the current speed (the reached speed) is maintained. Is implemented. On the other hand, when the rotational speed of the rotating drum 3 reaches the rated rotational speed without vibration exceeding the preset value stored in advance, dehydration is performed at the rated rotational speed. In FIG. 8, this operation corresponds to a portion where the rotation speed changes at a rotation speed of 1110 rpm or slightly less.

  For laundry dryers that perform washing, dehydration, and drying in succession, how efficiently the dehydration process is completed and the process proceeds to the drying process has a major impact on shortening the time from washing to drying. One.

  In the dehydration process, the rotating drum 3 rotates at a wide range of rotation speeds from low speed to high speed. If there is an unbalance of laundry in the rotating drum 3 in the dewatering process, depending on the number of rotations, the rotating drum 3 may be swung around, causing the rotating drum 3 to collide with the water tank and generate noise. May occur. In order to avoid this, in the conventional control, the rotational speed of the rotating drum is controlled according to the unbalanced state obtained by using the output of the vibration detector provided in the water tank in order to detect abnormal vibration of the rotating drum. In addition, the dehydration operation is performed at a rotation speed that allows safe rotation.

  However, in the conventional control, the vibration state of the rotating drum is detected and the dehydrating rotational speed is reduced until the ultimate rotational speed or the rated rotational speed is reached. In this case, vibrations cannot be suppressed if imbalance occurs after reaching the ultimate rotational speed or the rated rotational speed due to uneven water separation due to the difference in the type of clothing. Since the vibration cannot be suppressed, the operation is continued with a large vibration. In this case, abnormal vibration may occur.

  On the other hand, in the case of the control according to the present embodiment, if an imbalance occurs after reaching the reached rotational speed or the rated rotational speed, the rotational speed is decreased. Thereby, generation | occurrence | production of abnormal vibration can be prevented. As a result, it is possible to provide a washing machine capable of preventing abnormal vibration even when various types of clothes are washed together.

  In the first modification of the present embodiment, in step S211, the decrease rate may change in time series or may correspond to the weight of the laundry.

<Second Embodiment>
Hereinafter, a drum type washing machine according to the second embodiment of the present invention will be described.

  FIG. 9 is a functional block diagram of the control circuit 5 according to the present embodiment. Referring to FIG. 9, control circuit 5 according to the present embodiment includes information storage unit 200, washing process control unit 202, rinsing process control unit 204, dehydration process control unit 210, and drying process control unit 208. Including.

  The dehydration process control unit 210 controls the washing tub drive motor 4, the washing water supply valve 38, and the drain valve 40 so as to perform a dehydration process described later.

  The dehydration process control unit 210 includes an unbalance determination unit 220, an acceleration control unit 222, a deceleration control unit 228, and an end control unit 226.

  The deceleration control unit 228 controls the washing tub drive motor 4 so that the rotational speed of the rotary drum 3 decreases when at least one of the vibration requirement and the rotational speed requirement is satisfied and then the later-described requirements are further satisfied. To do.

The deceleration control unit 228 includes a requirement determination unit 240 and a suppression control unit 242.
The requirement determination unit 240 determines whether or not both of the following two requirements described below are satisfied. The first requirement is a requirement that the rotation number of the rotary drum 3 is equal to or greater than a threshold value. The second requirement is a requirement that the vibration component detected by the vibration detection unit 104 exceeds a threshold value. In the case of the present embodiment, specific values differ between the former threshold value and the latter threshold value.

  The suppression control unit 242 controls the washing tub drive motor 4 so that the number of rotations of the rotary drum 3 decreases when the two requirements described above are satisfied.

  The hardware configuration excluding other points is the same as that of the first embodiment described above. The function about them is the same. Therefore, detailed description thereof will not be repeated here.

  Referring to FIG. 10, the program executed by control circuit 5 performs the following control regarding the dehydration process. In the flowchart shown in FIG. 10, the same step numbers are assigned to the processes shown in FIG. The processes are the same except that the deceleration control unit 228 performs the process performed by the deceleration control unit 224 in the first embodiment. Therefore, detailed description thereof will not be repeated here.

  In step S <b> 310, the CPU 23 that operates as the requirement determination unit 240 stores the output value output from the vibration detection unit 104 to the state detection circuit 34 that operates as the requirement determination unit 240 in the ROM 25 that operates as the requirement determination unit 240. It is determined whether or not it is equal to or less than the lower set value. If it is determined that the output value is equal to or lower than the lower set value (YES in step S310), the process proceeds to step S210. If not (NO in step S310), the process proceeds to step S311.

  In step S <b> 311, the CPU 23 that operates as the requirement determination unit 240 stores the number of rotations output from the rotation detection sensor 105 to the state detection circuit 34 that operates as the requirement determination unit 240 in the ROM 25 that operates as the requirement determination unit 240. It is determined whether the rotation speed is equal to or higher than a specific rotation speed (950 rpm in the case of the present embodiment). If it is determined that the rotation speed output from rotation detection sensor 105 is equal to or higher than the specific rotation speed (YES in step S311), the process proceeds to step S211. If not (NO in step S311), the process proceeds to step S312.

  In step S <b> 312, the CPU 23 that operates as the suppression control unit 242 outputs a control signal to the load drive circuit 37 that operates as the suppression control unit 242. When the control signal is output, the load driving circuit 37 controls the washing tub driving motor 4 so that the rotating drum 3 stops rotating.

  In step S314, the CPU 23 operating as the end control unit 226 starts the rotation of the rotary drum 3 based on the elapsed time measured by the timer 26 operating as the end control unit 226, and then operates as the end control unit 226. It is determined whether the stored rated dehydration time has elapsed. If it is determined that the rated dehydration time has elapsed (YES in step S314), the process ends. A drying process is started after completion | finish of a process. If not (NO in step S314), the process proceeds to step S310.

  The operation of the drum type washing machine based on the above-described structure and flowchart will be described.

  If the output value of the vibration detection unit 104 exceeds the lower set value while continuing the high-speed dewatering operation through the processing up to step S208 (step S310), the rotation detection sensor detects the number of rotations of the rotating drum 3 at that time. Detect by 105.

  When the rotational speed is equal to or higher than the rotational speed (for example, 950 rpm) that has a margin compared to the rotational speed (for example, 900 rpm) necessary for ensuring the minimum degree of dewatering (step S311), the CPU 23 sets the decrease. The rotational speed is continuously reduced at a constant rate (−5 rpm / sec) until the value falls below the value (step S211).

  Thereafter, after the rotation is continued for the rated time (step S310, step S210, and step S341), the operation of the drying process is started.

  On the other hand, if the output value of the vibration detection unit 104 exceeds the set value while the high speed dewatering operation is continued and is lower than the rotation speed (950 rpm), the CPU 23 stops the rotation of the rotary drum 3 at that time. (S312).

  Thereafter, the operation returns to the beginning of the dehydration step, and the dehydration operation is performed again. This is because it is expected that a sufficient degree of dehydration cannot be secured by dehydration at a reduced rotational speed.

  As described above, the drum-type washing machine according to the present embodiment rotates until the rotating drum 3 is rotated at a high speed to some extent and a large vibration is generated until it falls below the lower set value. The rotational speed of the drum 3 is reduced. When a large vibration is generated and the rotational speed of the rotary drum 3 is low, the dehydration process is restarted from the beginning when the large vibration is generated. Thereby, the occurrence of a situation where the laundry is not sufficiently dried can be avoided, and the dehydration operation can be performed safely. As a result, it is possible to provide a washing machine that can prevent the occurrence of a situation where the laundry does not sufficiently dry and can prevent abnormal vibration even when various types of clothes are washed together.

<Third embodiment>
The drum type washing machine according to the third embodiment of the present invention will be described below.

  FIG. 11 is a functional block diagram of the control circuit 5 according to the present embodiment. Referring to FIG. 11, control circuit 5 according to the present embodiment includes information storage unit 200, washing process control unit 202, rinsing process control unit 204, dehydration process control unit 212, and drying process control unit 208. Including.

  The dehydration process control unit 212 controls the washing tub drive motor 4, the washing water supply valve 38, and the drain valve 40 so as to perform a dehydration process described later.

  The dehydration process control unit 212 includes an unbalance determination unit 220, an acceleration control unit 222, a deceleration control unit 230, and an end control unit 226.

  The deceleration control unit 230 controls the washing tub drive motor 4 so that the rotational speed of the rotary drum 3 is reduced when at least one of the vibration requirement and the rotational speed requirement is satisfied and then the later-described requirements are further satisfied. To do.

Deceleration control unit 230 includes a requirement determination unit 244 and a suppression control unit 246.
The requirement determination unit 244 determines whether or not both of the following two requirements are satisfied. The first requirement is a requirement that the rotation number of the rotary drum 3 is equal to or greater than a threshold value. The second requirement is that the ratio of the time elapsed since the rotation of the rotary drum 3 is started to the rated dehydration time is equal to or greater than a predetermined threshold value. In the case of the present embodiment, specific values differ between the former threshold value and the latter threshold value.

  The suppression control unit 246 controls the washing tub drive motor 4 so that the number of rotations of the rotary drum 3 decreases when the two requirements described above are satisfied.

  The hardware configuration excluding other points is the same as that of the first embodiment described above. The function about them is the same. Therefore, detailed description thereof will not be repeated here.

  Referring to FIG. 12, the program executed by control circuit 5 performs the following control regarding the dehydration process. In the flowchart shown in FIG. 12, the processes shown in FIG. 7 are given the same step numbers. These processes are the same except that the deceleration control unit 230 performs the process performed by the deceleration control unit 224 in the first embodiment. Therefore, detailed description thereof will not be repeated here.

  In step S410, the CPU 23 that operates as the requirement determination unit 244 stores the output value output from the vibration detection unit 104 to the state detection circuit 34 that operates as the requirement determination unit 244 in the ROM 25 that operates as the requirement determination unit 244. It is determined whether or not it is equal to or less than the lower set value. If it is determined that the output value is equal to or lower than the lower set value (YES in step S410), the process proceeds to step S210. If not (NO in step S410), the process proceeds to step S411.

  In step S411, the CPU 23 operating as the requirement determining unit 244 starts the rotation of the rotating drum 3 based on the elapsed time measured by the timer 26 operating as the requirement determining unit 244, and then operates as the requirement determining unit 244. It is determined whether or not 70% or more of the rated dehydration time stored has elapsed. If it is determined that 70% or more of the rated dehydration time has elapsed (YES in step S411), the process proceeds to step S211. If not (NO in step S411), the process proceeds to step S412.

  In step S <b> 412, the CPU 23 that operates as the suppression control unit 246 outputs a control signal to the load drive circuit 37 that operates as the suppression control unit 246. When the control signal is output, the load driving circuit 37 controls the washing tub driving motor 4 so that the rotating drum 3 stops rotating.

  In step S413, the CPU 23 operating as the end control unit 226 starts the rotation of the rotating drum 3 based on the elapsed time measured by the timer 26 operating as the end control unit 226, and then operates as the end control unit 226. It is determined whether the stored rated dehydration time has elapsed. If it is determined that the rated dehydration time has elapsed (YES in step S413), the process ends. A drying process is started after completion | finish of a process. If not (NO in step S413), the process proceeds to step S410.

  The operation of the drum type washing machine based on the above-described structure and flowchart will be described.

  In the drum type washing machine according to the present embodiment, the output value of the vibration detection unit 104 exceeds the lower set value while continuing the high speed dewatering operation (NO in step S410), and the elapsed time of the high speed dewatering at that time point If 70% or more of the rated dehydration time has elapsed (YES in step S411), the rotational speed of the rotating drum 3 is decreased at a constant speed (−5 rpm / sec) until it falls below the lower set value (step S211). . Thereafter, the rotation is continued until the rated time has elapsed, and the process proceeds to the drying process (steps S410, S210, and S413). The reason for this operation is that it can be determined that the degree of dehydration is almost secured when the output value of the vibration detection unit 104 exceeds the lower set value, and the dehydration process is stopped once and the dehydration process is started again from the beginning. This is because the effect of reducing the time is lost by redoing.

  On the other hand, while the high-speed dewatering operation is continued, the output value of the vibration detection unit 104 exceeds the lower set value (NO in step S410), and the elapsed time of the high-speed dewatering at that time does not reach 70% of the rated dewatering time. Is determined (NO in step S411), the rotation of the rotating drum 3 is stopped at that time (step S412), the process returns to the top of the dehydration process, and the dehydration operation is performed again. When the output value of the vibration detection unit 104 exceeds the lower set value, the degree of dehydration is not yet sufficient, and rather than continuing the dehydration process by reducing the rotational speed, the dehydration process is performed again, This is because the time required for the drying process can be shortened by ensuring the above.

  As described above, in the drum type washing machine according to the present embodiment, the output value of the vibration detection unit 104 exceeds the lower set value while the high speed dewatering operation is continued, and the elapsed time of the high speed dewatering at that time is rated. When 70% or more of the dewatering time has elapsed, the rotation speed of the rotating drum 3 is decreased until the dehydration time is below the set value, and the dewatering process is continued at a dewatering speed that allows safe dewatering operation. On the other hand, when the elapsed time of the high-speed dehydration does not reach 70% of the rated dehydration time, the process returns to the top of the dehydration process and the dehydration operation is performed again. This greatly reduces the possibility of insufficient drying of the garment. As a result, it is possible to provide a washing machine that can prevent the occurrence of a situation where the laundry does not sufficiently dry and can prevent abnormal vibration even when various types of clothes are washed together.

  In step S411 according to the modification of the present embodiment, the CPU 23 may determine whether 90% or more of the rated dewatering time has elapsed after the rotation of the rotary drum 3 is started.

<Fourth embodiment>
The drum type washing machine according to the fourth embodiment of the present invention will be described below.

  The ROM 25 according to the present embodiment stores data of the decrease width in addition to the information stored in the case of the first embodiment. This data is stored in association with the rotational speed of the rotary drum 3.

  The function of the control circuit 5 is different from the function of the control circuit 5 according to the first embodiment. FIG. 13 is a functional block diagram of the control circuit 5 according to the present embodiment. Referring to FIG. 13, the control circuit 5 according to the present embodiment includes an information storage unit 200, a washing process control unit 202, a rinsing process control unit 204, a dehydration process control unit 214, and a drying process control unit 208. Including.

  The dehydration process control unit 214 controls the washing tub drive motor 4, the washing water supply valve 38, and the drain valve 40 so as to perform a dehydration process described later.

  The dehydration process control unit 214 includes an unbalance determination unit 220, an acceleration control unit 222, a deceleration control unit 232, and an end control unit 226.

  When at least one of the vibration requirement and the rotation speed requirement is satisfied and the vibration component detected by the vibration detection unit 104 exceeds the threshold value while the rotary drum 3 is rotating, the deceleration control unit 232 The washing tub drive motor 4 is controlled so that the rotational speed of 3 decreases. This threshold value is a threshold value for the vibration component for determining whether or not to decrease the rotation speed.

The deceleration control unit 232 includes a requirement determination unit 240 and a suppression control unit 248.
When at least one of the vibration requirement and the rotational speed requirement is satisfied, the suppression control unit 248 detects the vibration when the vibration component detected by the vibration detection unit 104 exceeds the threshold value while the rotary drum 3 is rotating. The washing tub drive motor 4 is controlled so that the rotational speed of the rotary drum 3 decreases at a speed corresponding to the rotational speed when the vibration component detected by the unit 104 exceeds the threshold value.

  The hardware configuration excluding other points is the same as that of the first embodiment described above. The function about them is the same. Therefore, detailed description thereof will not be repeated here.

  Referring to FIG. 14, the program executed by control circuit 5 performs the following control regarding the dehydration process. In the flowchart shown in FIG. 14, the same step numbers are assigned to the processes shown in FIG. The processes are the same except that the deceleration control unit 232 performs the process performed by the deceleration control unit 224 in the first embodiment. Therefore, detailed description thereof will not be repeated here.

  In step S <b> 510, the CPU 23 that operates as the requirement determination unit 240 stores the output value output from the vibration detection unit 104 to the state detection circuit 34 that operates as the requirement determination unit 240 in the ROM 25 that operates as the requirement determination unit 240. It is determined whether or not it is equal to or less than the lower set value. If it is determined that the output value is equal to or lower than the lower set value (YES in step S510), the process proceeds to step S210. If not (NO in step S510), the process proceeds to step S511.

  In step S <b> 511, the CPU 23 operating as the suppression control unit 248 stores the number of rotations output from the rotation detection sensor 105 to the state detection circuit 34 operating as the suppression control unit 248 in the ROM 25 operating as the dehydration process control unit 206. It is determined whether it is less than a specific rotation speed (950 rpm in the case of the present embodiment). When it is determined that the rotation speed output from rotation detection sensor 105 is less than the specific rotation speed (YES in step S511), the process proceeds to step S512. If not (NO in step S511), the process proceeds to step S513.

  In step S <b> 512, the CPU 23 that operates as the suppression control unit 248 outputs a control signal to the load drive circuit 37 that operates as the suppression control unit 248. When the control signal is output, the load driving circuit 37 controls the washing tub driving motor 4 so that the rotating drum 3 stops rotating.

  In step S 513, the CPU 23 that operates as the suppression control unit 248 refers to the data of the decrease width stored in the ROM 25 that operates as the suppression control unit 248. The data to be referred to is data corresponding to the rotation number output from the rotation detection sensor 105 in step S206. When the decrease width data is referred to, the CPU 23 outputs a control signal to the load driving circuit 37 that operates as the suppression control unit 248. When the control signal is output, the load drive circuit 37 controls the washing tub drive motor 4 so that the number of rotations of the rotary drum 3 decreases. The decrease width is a width indicated by data referred to by the CPU 23.

  In step S514, the CPU 23 operating as the end control unit 226 starts the rotation of the rotating drum 3 based on the elapsed time measured by the timer 26 operating as the end control unit 226, and then operates as the end control unit 226. It is determined whether the stored rated dehydration time has elapsed. If it is determined that the rated dehydration time has elapsed (YES in step S514), the process ends. A drying process is started after completion | finish of a process. If not (NO in step S514), the process proceeds to step S510.

  The operation of the drum type washing machine based on the above-described structure and flowchart will be described.

  In the drum type washing machine according to the present embodiment, when the output value of the vibration detection unit 104 exceeds the lower set value while continuing the high-speed dewatering operation (step S510), the rotational speed of the rotating drum 3 at that time is It is determined whether or not the rotation speed is less than the specific rotation speed (step S511). If the rotation speed of the rotary drum 3 at that time is equal to or higher than the specific rotation speed, the rotation speed is kept until the output value of the vibration detection unit 104 falls below the lower set value. The number of rotations of the rotary drum 3 is reduced by a reduction width corresponding to the above. Thereafter, the rated time is continued (step S510, step S210, and step S514), and the process proceeds to the drying process.

  FIG. 15 is a diagram showing the data of the reduction speed stored in the ROM 25 in the present embodiment. As shown in FIG. 15, in the case of the present embodiment, the rate of decrease decreases as the rotational speed increases. Thereby, the load concerning the washing tub drive motor 4 can be reduced.

  On the other hand, when the output value of the vibration detection unit 104 exceeds the set value while the high speed dewatering operation is continued and is lower than the specific rotation speed (950 rpm), washing is performed in a low speed unbalanced state with the rotation speed decreased. Since it is considered that the product cannot be sufficiently dehydrated, the drum type washing machine according to the present embodiment stops the dehydration rotation at that time (S512), returns to the top of the dehydration process, and performs the dehydration operation again. .

  As described above, the drum type washing machine according to the present embodiment maintains the number of revolutions after the number of revolutions of the rotating drum 3 at the time of dehydration is determined so that the number of revolutions is equal to or less than a predetermined rated number of revolutions. In the middle of continuing the dehydration operation, when the rotational speed of the rotary drum 3 is decreased because the output value of the vibration detection unit 104 exceeds the specified decrease set value, the speed that decreases during the unit time is By selecting according to the rotational speed at the time, the load applied to the washing tub drive motor 4 is reduced. As a result, a load applied to the washing tub drive motor 4 can be reduced, and a washing machine capable of preventing abnormal vibration even when various types of clothes are washed together can be provided.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a perspective view which shows the external appearance of the drum type washing machine which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the inside of the drum type washing machine which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the vicinity of the water tank of the drum type washing machine which concerns on the 1st Embodiment of this invention. It is a top view of the package of the acceleration sensor which concerns on the 1st Embodiment of this invention. It is a control block diagram of the drum type washing machine concerning a 1st embodiment of the present invention. It is a functional block diagram of the control circuit which concerns on the 1st Embodiment of this invention. It is a flowchart which shows the procedure of control of the spin-drying | dehydration process based on the 1st Embodiment of this invention. It is a figure which shows control of the spin-drying | dehydration operation | movement of the drum type washing machine which concerns on the 1st Embodiment of this invention. It is a functional block diagram of the control circuit which concerns on the 2nd Embodiment of this invention. It is a flowchart which shows the procedure of control of the spin-drying | dehydration process based on the 2nd Embodiment of this invention. It is a functional block diagram of the control circuit which concerns on the 3rd Embodiment of this invention. It is a flowchart which shows the procedure of control of the spin-drying | dehydration process based on the 3rd Embodiment of this invention. It is a functional block diagram of the control circuit which concerns on the 4th Embodiment of this invention. It is a flowchart which shows the procedure of control of the spin-drying | dehydration process based on the 4th Embodiment of this invention. It is a figure which shows the data of the fall speed of the rotating drum which concerns on the 4th Embodiment of this invention.

Explanation of symbols

  1 box, 2 water tub, 3 rotating drum, 4 washing tub drive motor, 5 control circuit, 6 suspension, 7 bottom base, 8 top plate, 9 steps, 10 door, 11 operation panel, 12 tap water supply channel, 15 door packing, 17 filter device, 18 drain duct, 20 drain hose, 21 drain motor, 22 microcomputer, 23 CPU, 24 RAM, 25 ROM, 26 timer, 27 I / O port, 28 system bus, 29 control unit, 30 arithmetic unit, 31 power supply circuit, 32 reset circuit, 33 input key circuit, 34 state detection circuit, 35 display device drive circuit, 36 buzzer drive circuit, 37 load drive circuit, 38 washing water supply valve, 39 circulation pump, 40 drainage Valve, 42 Water supply duct, 45 Detergent case, 46 Circulation hose, 47 Nozzle, 48 Drain 50 Blower, 51 Fan motor, 52 Blower fan, 53 Motor shaft, 54 Fan casing, 60 Water tank opening, 62 Fluid balancer, 64 Small hole, 66 Drum opening, 68 Baffle, 70 Projection, 80 Heating device, 82 Air duct, 84 Heater case, 86 Heater, 88 Air outlet, 90 Dehumidifier, 92 Condensing plate, 94 Ventilation duct, 102 Display device, 103 Buzzer, 104 Vibration detector, 105 Rotation detection sensor, 106 Air outlet temperature controller, 107 Water level sensor, 108 Internal temperature detection unit, 109 Acceleration sensor, 200 Information storage unit, 202 Washing process control unit, 204 Rinse process control unit, 206, 210, 212, 214 Dehydration process control unit, 208 Drying process control unit, 220 Unbalance determination unit, 222 Acceleration control unit, 2 4,228,230,232 deceleration control unit, 226 end control unit, 240, 244 requirements determination unit, 242,246,248 suppression control unit.

Claims (6)

A water tank housed in a box,
A drain valve connected to the water tank;
A drum rotatably supported in the water tank;
Driving means connected to the drum for driving the drum to rotate;
Vibration detecting means for detecting a vibration component of the water tank;
A rotational speed detection means for detecting the rotational speed of the drum;
Control means for controlling the drive means,
The control means includes
During the dehydrating operation in which the drum rotates with the drain valve open, the magnitude of the vibration component detected by the vibration detecting means is equal to or greater than the set increase value for determining whether to increase the rotational speed. Acceleration control means for controlling the driving means so as to increase the rotation speed of the drum until at least one of the vibration requirement and the rotation speed requirement that the rotation speed of the drum is equal to or greater than a threshold is satisfied; ,
In order to determine whether or not the vibration component detected by the vibration detection means while the drum is rotating after the at least one of the vibration requirement and the rotation speed requirement is satisfied reduces the rotation speed. And a deceleration control means for controlling the drive means so that the number of revolutions of the drum is reduced when the lowering set value of the drum is exceeded.   When the vibration component detected by the vibration detection unit exceeds the decrease set value while the drum is rotating, the deceleration control unit is configured to reduce the rotation speed of the drum at a constant rate. The washing machine according to claim 1, comprising a drop control means for controlling the means. The deceleration control means includes
In order to determine whether the rotational speed of the drum is equal to or higher than a specific rotational speed for determining whether to decrease the rotational speed, and whether the vibration component detected by the vibration detection means exceeds the decrease set value. Requirements determination means,
When the rotation speed of the drum is equal to or higher than the specific rotation speed and the vibration component detected by the vibration detection means exceeds the reduction set value, the drive means is controlled so that the rotation speed of the drum is reduced. The washing machine according to claim 1, comprising suppression control means for   The suppression control means controls the driving means so that the rotation speed of the drum decreases at a rate corresponding to the rotation speed at the time when the vibration component detected by the vibration detection means exceeds the lower set value. The washing machine according to claim 3, comprising the following means.   The deceleration control means has an elapsed time after the time when at least one of the vibration requirement and the rotation speed requirement is satisfied exceeds a threshold, and the vibration component detected by the vibration detection means exceeds the lower set value. The washing machine according to claim 1, further comprising means for controlling the driving means such that the rotational speed of the drum decreases. The washing machine
Cooling means for cooling the air inside the water tank;
Heating means for heating air having a reduced amount of water vapor due to the cooling means cooling the air;
Supply means for supplying air heated by the heating means into the drum;
The control means includes
When the elapsed time after at least one of the vibration requirement and the rotation speed requirement is exceeded exceeds a threshold for determining whether or not to end the dewatering operation, the rotation of the drum is stopped. Termination control means for controlling the drive means;
When the end control means controls the driving means so as to stop the rotation of the drum, the air flowing out from the inside of the drum to the inside of the water tank is cooled, and the air whose water vapor amount is reduced by cooling is heated. The apparatus according to claim 1, further comprising a drying control means for controlling the cooling means, the heating means, and the supply means so as to supply the heated air to the inside of the drum. Washing machine.

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