JP2017080087A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a washing machine capable of performing a dewatering operation normally after a warm water washing operation without depending on a washing water cooling operation for lowering water temperature by water supply from a water supply valve.SOLUTION: A washing machine of the embodiment includes: a water tub at least the one part of which is constituted of a resin; a rotary tub provided inside the water tub; washing operation execution means capable of executing a warm water washing operation for washing laundry by warming the water in the water tub or by supplying warm water in the water tub as a washing operation for washing the laundry in the rotary tub, and a non-warm water washing operation for washing the laundry without warming the water in the water tub; and dewatering operation execution means for executing the dewatering operation for dewatering the laundry by rotating the rotary tub after the washing operation. The dewatering operation execution means performs, in the dewatering operation performed after the warm water washing operation, a low-speed dewatering operation in which the maximum rotational speed of the rotary tub is further lowered than that in a normal dewatering operation performed after the non-warm water washing operation.SELECTED DRAWING: Figure 3

Description

  Embodiments described herein relate generally to a washing machine.

  Conventionally, a washing machine for washing laundry in a tub with warm water has been considered. In this type of washing machine, since warm water is discharged to a pipe or the like constituting the drainage system, it is required to avoid an adverse effect on the drainage system due to such warm drainage. For example, Patent Document 1 discloses a technique for draining water after performing a washing water cooling operation in which water temperature is lowered by water supply from a water supply valve when the temperature of water in a water tank is equal to or higher than a predetermined temperature. .

JP 2003-159492 A

  According to the above-described conventional technology, the influence of the hot water on the drainage system can be avoided. However, the adverse effects of hot water on components other than the drainage system are not fully considered. That is, according to the warm water washing operation in which the laundry is washed with warm water, the resin, which is a constituent component of the water tank, is softened by the warm water, and the vibration of the water tank is increased in the dehydrating operation following the draining operation. Therefore, if the dehydration operation after the hot water washing operation is executed in the same way as the dehydration operation after the normal washing operation for washing laundry without using hot water, the softened water tank will vibrate greatly and collide with the internal rotating tank. The dehydration operation cannot be performed normally.

  In the above-described prior art, for example, the water tank may be cooled by loosening the execution condition of the washing water cooling operation by setting the predetermined temperature lower, or increasing the amount of water supplied in the washing water cooling operation. Conceivable. However, in this case, the amount of cooling water used is increased and the operation time is extended.

  Accordingly, a washing machine is provided that can perform a normal dehydration operation after the hot water washing operation without depending on the washing water cooling operation in which the water temperature is lowered by water supply from the water supply valve.

  The washing machine according to the present embodiment includes a water tub, a rotating tub, a washing operation execution unit, and a dehydration operation execution unit. The water tank is at least partially made of resin. The rotating tank is provided in the water tank. The washing operation executing means, as a washing operation for washing the laundry in the rotating tub, warms the water in the water tub, or supplies warm water to the water tub to wash the laundry, and the washing operation A non-warm water washing operation for washing the laundry without warming the water in the aquarium can be performed. The dehydrating operation executing means executes a dehydrating operation of rotating the rotating tub and dehydrating the laundry after the washing operation. In the dehydration operation performed after the warm water washing operation, the dehydration operation execution means performs a low speed dewatering operation in which the maximum rotation speed of the rotating tank is lower than that in the normal dehydration operation performed after the non-warm water washing operation.

1 is a longitudinal side view schematically showing a configuration example of a washing machine according to a first embodiment. Block diagram showing an example of the electrical configuration of a washing machine Flow chart showing an example of operation of the washing machine The flowchart which shows the operation example of the washing machine which concerns on 2nd Embodiment. The flowchart which shows the operation example of the washing machine which concerns on 3rd Embodiment. The flowchart which shows the operation example of the washing machine which concerns on 4th Embodiment. The flowchart which shows the operation example of the washing machine which concerns on 5th Embodiment. The figure which shows the example of a setting of the dehydration permission temperature which concerns on 6th Embodiment The block diagram which shows the electrical structural example of the washing machine which concerns on 7th Embodiment. The figure which shows the example of change of the water temperature in the aquarium The figure which shows the example of control of the dehydration operation based on the presence or absence of temperature high information The flowchart which shows the operation example of the washing machine which concerns on 8th Embodiment. The figure which shows the example of a setting of the frequency | count of the rinse operation | movement which concerns on 9th Embodiment

Hereinafter, a plurality of embodiments according to a washing machine will be described with reference to the drawings. In each embodiment, substantially the same elements are denoted by the same reference numerals, and description thereof is omitted.
(First embodiment)
A washing machine 10 illustrated in FIG. 1 is a so-called horizontal-axis type drum-type washing machine in which the rotation axis direction of the rotation tub is inclined, and a water tub 12, a drum 13, etc. Prepare. The water tank 12 has a bottomed cylindrical shape and is elastically supported by a suspension (not shown). The water tank 12 includes a water tank cover 15 on the front surface of the body portion 14. The water tank cover 15 is provided with a circular opening 16. The opening 16 of the water tank 12 has a smaller diameter than the body part 14 of the water tank 12. The water tank 12 and the water tank cover 15 are made of a resin material.

  The drum 13 has a bottomed cylindrical shape and is rotatably disposed in the water tank 12. The drum 13 is an example of a rotating tank. The rotation axis direction of the drum 13 is inclined so that the rear surface side is lower than the front surface side along the front-rear direction of the washing machine 10, that is, the depth direction. The drum 13 is rotated by a drive motor 17 provided on the rear surface of the water tank 12. A circular opening 13 a is provided on the front surface of the drum 13. A plurality of holes (not shown) are provided in the peripheral wall portion of the drum 13. In addition, a plurality of baffles (not shown) are provided on the inner peripheral surface of the drum 13 for picking up laundry.

  On the front surface of the outer box 11, a laundry entrance / exit 18 for taking in and out the laundry is provided. A door 19 is attached to the laundry doorway 18 so as to be openable and closable. The door 19 is mainly composed of a transparent member such as glass, and the inside of the tub is visible from the outside of the washing machine 10. Further, the laundry entrance 18 and the opening 16 of the water tub 12 are watertightly connected by a bellows 20. In addition, an operation panel (not shown) having various operation buttons such as an operation start button, a display unit, and the like is provided on the front upper portion of the outer box 11. A control device 21 is provided on the back side of the operation panel. The control device 21 is configured mainly with a microcomputer and controls the overall operation of the washing machine 10.

  The washing machine 10 also includes a water supply mechanism 22 that supplies water into the aquarium 12, a drainage mechanism 23 that discharges the water in the aquarium 12 to the outside of the machine, and the like. The water supply mechanism unit 22 includes a water supply valve 24, a water injection case 25, a water supply hose 26, and the like. The water supply mechanism 22 supplies water into the water tank 12 through the water injection case 25 and the water supply hose 26 by opening the water supply valve 24. The drain mechanism 23 includes a drain valve 27, a drain hose 28, and the like. The drainage mechanism unit 23 drains the water in the water tank 12 through the drainage hose 28 by opening the drainage valve 27.

  The washing machine 10 includes a heating unit 30. The heating unit 30 includes a groove-like recess 31 provided at the bottom of the water tank 12 and a hot water heater 32 disposed in the recess 31. The drain hose 28 of the drain mechanism 23 is communicated with the recess 31. The washing machine 10 also includes a drying unit (not shown) for drying the laundry in the drum 13. As a configuration for realizing the drying unit, various configurations for supplying warm air into the drum 13 are conceivable. For example, a configuration by a heat pump mechanism including a condenser, an evaporator, and the like is conceivable. Moreover, the washing machine 10 includes a circulation mechanism (not shown) that ejects the water tank 12 in a shower shape while circulating the water in the water tank 12. The circulation mechanism includes a circulation water channel communicating with the water tank 12 and a circulation pump for pumping water in the water tank 12 through the circulation water channel.

  As illustrated in FIG. 2, various electrical components of the washing machine 10 such as the drive motor 17, the water supply valve 24, the drain valve 27, and the heating unit 30 described above are connected to the control device 21. The control device 21 executes various driving courses by controlling the driving of these components based on the operation input of the operation panel by the user. In addition, various types of sensors such as a water temperature detection sensor 41 and a rotational position detection sensor 42 are connected to the control device 21. The water temperature detection sensor 41 detects the temperature of water stored in the water tank 12. The rotational position detection sensor 42 detects the rotational position of the rotor of the drive motor 17. In addition, the control unit 21 is connected to a storage unit 45 configured by, for example, a nonvolatile memory.

  Further, the control device 21 executes a control program by the CPU, thereby performing a washing operation execution processing unit 51, a rinsing operation execution processing unit 52, a dehydration operation execution processing unit 53, a cooling operation execution processing unit 54, and a heating operation execution processing unit. 55 is virtually realized by software. Note that these processing units 51 to 55 may be realized by hardware, or may be realized by a combination of software and hardware.

  The washing operation execution processing unit 51 is an example of a washing operation execution unit, and executes a known washing operation of washing or washing the laundry in the drum 13 by rotating or swinging the drum 13. In this case, the washing operation execution processing unit 51 can execute a warm water washing operation and a non-warm water washing operation as the washing operation. The warm water washing operation is a washing operation in which the heating unit 30 is driven to warm the water in the water tank 12 and wash the laundry. The non-warm water washing operation is a washing operation for washing the laundry without driving the heating unit 30 and warming the water in the water tank 12.

The rinsing operation execution processing unit 52 is an example of a rinsing operation executing means, and executes a well-known rinsing operation for rinsing the laundry in the drum 13 by rotating or swinging the drum 13.
The dehydration operation execution processing unit 53 is an example of a dehydration operation execution unit, and performs a well-known dehydration operation of rotating the drum 13 to dehydrate the laundry after the washing operation by the washing operation execution processing unit 51. In this case, the dehydration operation execution processing unit 53 can execute a normal dehydration operation and a low-speed dehydration operation as the dehydration operation. The normal dehydration operation is a dehydration operation in which the laundry is dehydrated by rotating the drum 13 at a predetermined rotation speed set in advance. The low-speed dehydrating operation is a dehydrating operation in which the rotation speed of the drum 13 is set lower than that in the normal dehydrating operation to dehydrate the laundry.

  The cooling operation execution processing unit 54 is an example of a cooling operation execution unit, and executes a cooling operation for cooling water in the water tank 12. In this case, the cooling operation execution processing unit 54 supplies water into the water tank 12 by the water supply mechanism unit 22, and agitates the water in the water tank 12 by rotating the drum 13, thereby the temperature of the water in the water tank 12. Reduce. In this case, the cooling operation execution processing unit 54 is set to execute the cooling operation after the washing operation execution processing unit 51 executes the warm water washing operation. The cooling operation execution processing unit 54 may be set not to execute the cooling operation after the non-warm water washing operation is executed, or may be set to execute.

  The heating operation execution processing unit 55 is an example of a heating operation execution means, and when the washing operation execution processing unit 51 executes the warm water washing operation, the heating unit 30 is driven before the execution to execute the inside of the water tank 12. A heating operation for heating water is executed. That is, the heating operation execution processing unit 55 generates hot water used in the warm water washing operation.

  Next, an operation example of the warm water washing operation by the washing machine 10 will be described. This hot water washing operation is an operation course including a washing operation, a rinsing operation, and a dehydrating operation, and executes a “hot water washing operation” as the washing operation. As illustrated in FIG. 3, when the hot water washing operation is started, the control device 21 executes a laundry amount determination process (A1). This laundry amount determination processing is processing for determining the amount of laundry put into the drum 13, and for example, the amount of laundry is determined as follows.

  That is, the control device 21 drives the drive motor 17 by supplying a certain amount of power, and monitors the rotational position of the rotor of the drive motor 17 based on the rotational position detection signal obtained from the rotational position detection sensor 42. And the control apparatus 21 measures the time required until the rotational speed of the drive motor 17 rises from a predetermined 1st rotational speed to a 2nd rotational speed with the timer which is not shown in figure. Next, the control device 21 stops energization of the drive motor 17 and rotates the drum 13 inertially. At this time, the rotation speed of the drive motor 17 decreases from a predetermined third rotation speed to a fourth rotation speed. Measure the time required to complete.

  The measured time required for increasing the rotational speed and time required for decreasing the rotational speed are values proportional to the amount of laundry. For this reason, the control device 21 compares the measured time required for increasing the rotational speed and time required for decreasing the rotational speed with a pre-stored time / laundry amount data table, so that the washing in the drum 13 is performed. The quantity is determined in multiple stages, for example, “large”, “medium”, and “small”. The time / laundry amount data table is a data table that stores data indicating the relationship between the time required for increasing the rotational speed and the time required for decreasing the rotational speed and the amount of laundry.

  When the control unit 21 completes the laundry amount determination process, the water supply mechanism 22 performs a water supply operation into the water tank 12 (A2). In this water supply operation, the control device 21 supplies the water tank 12 with an amount of water corresponding to the amount of laundry determined by the laundry amount determination process. In this case, for example, when the amount of laundry is “large”, the control device 21 is, for example, 30 liters, when the amount of laundry is “medium”, for example, 25 liters, and when the amount of laundry is “small”, for example, 20 liters of water is supplied into the water tank 12. Along with the water supply operation into the water tank 12, the detergents in the water injection case 25 are supplied into the water tank 12 together with water. Further, the control device 21 rotates the drum 13 in the forward rotation direction and the reverse rotation direction by the drive motor 17 in accordance with the water supply operation into the water tank 12. Thereby, the washing water in the water tank 12 is agitated, and dissolution of the detergents is promoted.

  When the controller 21 completes the water supply operation, the controller 21 performs a heating operation for heating the water in the water tank 12 (A3). In this heating operation, the control device 21 heats the water in the water tank 12 by energizing the hot water heater 32 of the heating unit 30. The control device 21 feedback-controls energization to the hot water heater 32 based on the temperature of the water in the water tank 12 detected by the water temperature detection sensor 41. Thereby, the control apparatus 21 heats the water in the water tank 12 to predetermined | prescribed preset temperature. The set temperature can be changed and set as appropriate. In this case, for example, the set temperature can be selected and set from multiple stages of 15 ° C., 40 ° C., and 60 ° C. For example, when the water in the water tank 12 is heated to around 60 ° C., a sterilizing effect can be expected.

  In the present embodiment, as described above, the control device 21 is configured to perform the heating operation immediately after the water supply operation into the water tank 12. However, for example, when a pre-washing operation for preliminarily washing the laundry in the drum 13 is set after the water supply operation, the control device 21 is configured to execute the heating operation after the pre-washing operation. May be. By the pre-washing operation, the detergent components in the washing water can be quickly penetrated into the laundry. Then, by performing the heating operation after this pre-washing operation, it is possible to obtain a so-called “washing-out washing” effect with warm water, and to obtain a higher cleaning effect.

  In addition, the control device 21 rotates the drum 13 in the forward direction and the reverse direction even during the heating operation. Thereby, it can avoid that the wash water in the water tank 12 is stirred and the temperature of the wash water rises locally, and can wash the wash water uniformly.

  When the controller 21 completes the heating operation, the controller 21 performs a warm water washing operation (A4). In this warm water washing operation, the laundry in the drum 13 is washed with the water in the water tank 12 warmed by the heating operation.

  When the control device 21 completes the warm water washing operation, the control device 21 performs the cooling operation. This cooling operation includes a water supply operation (A5) into the water tank 12 and a water stirring operation (A6) in the water tank 12. In the water supply operation of step A5, the control device 21 supplies a predetermined amount of water set in advance into the water tank 12. The amount of water supply at this time can be appropriately changed and set. Moreover, in the stirring operation of step A6, the control device 21 stirs the water in the water tank 12 by rotating the drum 13 in the normal rotation direction and the reverse rotation direction over a predetermined time. Thereby, while suppressing that the temperature nonuniformity generate | occur | produces in the water in the water tank 12, the cooling effect | action of the temperature of the water in the water tank 12 is accelerated | stimulated.

  When the cooling operation is completed, the control device 21 opens the drain valve 27 and executes a drain operation for discharging the water in the water tank 12 to the outside (A7). And the control apparatus 21 will perform low-speed dehydration operation | movement, if drainage operation is completed (A8). In this low speed dewatering operation, the control device 21 performs the dewatering operation by lowering the rotation speed of the drum 13 than the normal dewatering operation performed after the non-warm water washing operation in which the laundry is washed without warming the water in the water tank 12. That is, if the maximum rotation speed of the drum 13 in the normal dewatering operation is set to 1200 rpm, for example, the control device 21 sets the maximum rotation speed of the drum 13 in the low speed dewatering operation to 400 rpm.

  The reason why the rotational speed of the drum 13 is lower in the dehydration operation after the hot water washing operation than in the normal dehydration operation after the non-warm water washing operation is as follows. That is, in recent washing machines including the configuration example of the washing machine 10 according to the present embodiment, the temperature of the washing water in the hot water washing operation is set to a high temperature of, for example, 60 ° C. or more, and the washing performance tends to be further improved. There is. However, when the washing operation is performed with such high-temperature hot water, the resin that is a component of the water tank 12 is softened, and the vibration of the water tank 12 is increased in the dehydration operation subsequent to the draining operation. Therefore, as the centrifugal force of the rotating drum 13 increases in the dehydrating operation, the drum 13 and the water tank 12 located outside the drum 13 are likely to collide. When the drum 13 and the water tank 12 collide with each other, abnormal noise is generated or the drum 13 does not rotate well, and it becomes difficult to perform the dehydration operation normally.

  Therefore, in the washing machine 10 according to the present embodiment, in the dewatering operation performed after the warm water washing operation, the low speed dewatering operation in which the rotation speed of the drum 13 is lower than that in the normal dewatering operation is executed. Thus, by lowering the maximum rotation speed of the drum 13 in the dewatering operation after the hot water washing operation, the collision between the drum 13 and the water tank 12 can be avoided, and the dewatering operation can be performed normally. Moreover, even if it is low speed, the water tank 12 can be cooled by performing the spin-drying | dehydration operation which rotates the drum 13, and, thereby, the water tank 12 can be hardened and collision with the drum 13 can be avoided further.

  When the control device 21 completes the low-speed dewatering operation, it executes a shower rinsing operation (A9). In this shower rinsing operation, the control device 21 rotates the drum 13 at a low speed such as 100 rpm at which the laundry is stuck to the inner peripheral surface of the drum 13. The control device 21 supplies a predetermined amount of water into the water tank 12. And the control apparatus 21 spouts in the said water tank 12 in the shape of a shower, circulating the water in the water tank 12 by driving the circulation mechanism part which is not shown in figure. According to this shower rinsing operation, not only is the washing effect equivalent to a normal rinsing operation in which the circulating water is not jetted into the water tank 12, but also the washing water of the water tank 12 by the circulating water jetted into the shower is obtained. A cooling effect is also obtained.

  When the control device 21 completes the shower rinsing operation, the control device 21 performs a normal dehydration operation (A10). As described above, according to the shower rinsing operation, the cooling effect of the water tank 12 can also be obtained. Therefore, the water tank 12 can be sufficiently cooled by the normal dehydration operation performed after the shower rinsing operation, and the collision between the water tank 12 and the drum 13 can be further suppressed.

  When the normal dehydrating operation is completed, the control device 21 executes a rinsing operation (A11). Therefore, in the rinsing operation, the control device 21 supplies a predetermined amount of water into the water tank 12. Then, the control device 21 rotates the drum 13 in the forward rotation direction and the reverse rotation direction with water stored in the water tank 12. Thereby, the control device 21 rinses the laundry in the drum 13 together with the water in the water tank 12 while stirring. For this reason, the cooling effect of the water tank 12 can be obtained also by the rinsing operation. Therefore, for example, when the maximum rotation speed in the subsequent dewatering operation is set higher than the maximum rotation speed in the normal dewatering operation, the water tank 12 and the drum 13 are further collided by the cooling effect of the water tank 12 by the rinsing operation. Can be deterred.

  Thereafter, the control device 21 repeats the normal dehydration operation and the rinsing operation a predetermined number of times (A12, A13). In this case, the control device 21 repeats the normal dehydrating operation and the rinsing operation twice (A10, A11, A12, A13). Then, the control device 21 finally executes a final dehydration operation (A14) and ends this control. In the final dewatering operation, the control device 21 rotates the drum 13 at 1200 rpm, which is the same as in the normal dewatering operation. A plurality of times of water supply and agitation are performed in the water tank 12 until the final dehydration operation. Therefore, the water tank 12 can be sufficiently cooled, and the dehydrating operation can be performed satisfactorily.

  According to the present embodiment, the control device 21 performs a low-speed dewatering operation in which the maximum rotation speed of the drum 13 is lower in the dewatering operation performed after the hot water washing operation than in the normal dewatering operation performed after the non-warm water washing operation. Therefore, even when the washing operation is performed with hot water at a high temperature and the water tank 12 is softened, the maximum rotation speed of the drum 13 in the subsequent dehydration operation is lower than usual, so the water tank 12 and the drum 13 Collisions can be avoided and dehydration can be performed normally.

  Further, if abnormal vibration occurs in the water tank 12 due to the softening of the water tank 12, the dehydration operation may not be started successfully. In this case, it is necessary to restart the dehydration operation, which leads to an increase in the dehydration time, and hence the time required for the entire operation. According to this embodiment, when the water tank 12 is softened by the washing operation with warm water, the maximum rotation speed of the drum 13 in the subsequent dewatering operation is lowered. Therefore, abnormal vibration is less likely to occur in the water tank 12, and the possibility that the dehydration operation will fail to start is reduced. Therefore, a situation where the dehydration operation must be restarted is unlikely to occur, and the dehydration time, and thus the time required for the entire operation, can be shortened.

  Moreover, the control apparatus 21 performs the cooling operation | movement which consists of water supply and stirring before low-speed spin-drying | dehydration operation. Therefore, the temperature of the water tank 12 can be sufficiently cooled before the low speed dewatering operation is performed, and the collision between the water tank 12 and the drum 13 can be further avoided.

(Second Embodiment)
In the operation example illustrated in FIG. 4, steps B1 to B7 are the same as steps A1 to A7 in FIG. Steps B11 to B16 are the same as steps A9 to A14 in FIG. In the present embodiment, when the drainage operation (B7) is completed, the control device 21 determines whether or not the temperature of the water in the water tank 12 is equal to or lower than a predetermined temperature (B8). The control device 21 detects the temperature of the water in the water tank 12 by the water temperature detection sensor 41 before executing the above-described draining operation (B7), that is, before the water in the water tank 12 is drained. Further, the predetermined temperature that is the determination criterion in step B8 can be changed and set as appropriate.

  The degree to which the temperature of the water in the water tank 12 heated by the heating operation in step B3 decreases in the subsequent warm water washing operation (B4) is, for example, the temperature of the outside air, the temperature of the water supplied into the water tank 12, or the like. It will vary depending on. That is, for example, in winter, the outside air is low and the temperature of the water supplied into the water tank 12 is also low. Furthermore, if cold water is supplied in a cooling process (B5), the temperature of the water in the water tank 12 will fall rapidly. In such a case, even if the warm water washing operation (B4) is executed, the water tank 12 is unlikely to become high temperature and is not easily softened. Therefore, even if the rotation speed of the drum 13 is not lowered in the dehydration operation after the hot water washing operation, the water tank 12 and the drum 13 are unlikely to collide, and there is a high possibility that the dehydration operation can be performed normally.

  Therefore, in this embodiment, when the temperature of the water in the water tank 12 is equal to or lower than the predetermined temperature (B8: YES), the control device 21 estimates that the temperature of the water tank 12 is also lowered, and the normal dehydrating operation. (B9) is executed. On the other hand, when the temperature of the water in the water tank 12 exceeds the predetermined temperature (B7: NO), the control device 21 estimates that the temperature of the water tank 12 is not sufficiently lowered, and performs the low-speed dehydration operation (B10). ). That is, the control device 21 estimates the temperature of the water tank 12, that is, the degree of softening of the water tank 12, based on the temperature of the water in the water tank 12, and performs normal dehydration operation and low-speed dehydration operation according to the estimation result. Switch.

  Also according to this embodiment, the collision between the softened water tank 12 and the drum 13 can be avoided, and the dehydrating operation can be performed normally. Further, when it is estimated that the temperature of the water tank 12 has decreased by the time of the dehydration operation, it is not necessary to rotate the drum 13 at a low speed. Therefore, the drum 13 is rotated at a normal rotation speed to improve the dewatering performance. Can be achieved. In addition, it is possible to shorten the dehydration time, and hence the time required for the entire operation.

(Third embodiment)
In the operation example illustrated in FIG. 5, step C7 is a draining operation similar to step A7 in FIG. 3 or step B7 in FIG. Step C12 is a shower rinsing operation similar to step A9 in FIG. 3 or step B11 in FIG. In the present embodiment, when the drainage operation is completed, the control device 21 determines whether or not the water in the water tank 12 has reached a predetermined first reference temperature during the heating operation (C8). The first reference temperature can be appropriately changed and set. In this case, 65 ° C. is set. The first reference temperature is a target temperature of hot water for executing the warm water washing operation. Moreover, the control apparatus 21 detects the temperature of the water in the water tank 12 by the water temperature detection sensor 41 during heating operation.

  When the temperature of the water in the water tank 12 reaches the first reference temperature during the heating operation (C8: YES), the control device 21 estimates that the temperature of the water tank 12 is high and executes a low-speed dehydration operation ( C10). On the other hand, when the temperature of the water in the water tank 12 does not reach the first reference temperature during the heating operation (C8: NO), the control device 21 causes the water in the water tank 12 to be a predetermined second reference during the heating operation. It is determined whether or not the temperature has been reached (C9). The second reference temperature can be appropriately changed and set as long as the temperature is lower than the first reference temperature. In this case, 45 ° C. is set. The second reference temperature is a temperature that is considered safe for the user if it is lower than that, or a temperature that serves as a reference for determining whether or not the water in the water tank 12 is hot water. Moreover, the control apparatus 21 detects the temperature of the water in the water tank 12 by the water temperature detection sensor 41 during heating operation.

  When the temperature of the water in the water tank 12 reaches the second reference temperature during the heating operation (C9: YES), the control device 21 estimates that the temperature of the water tank 12 is high and executes a low-speed dehydration operation ( C10). On the other hand, when the temperature of the water in the water tank 12 does not reach the second reference temperature during the heating operation (C9: YES), the control device 21 estimates that the temperature of the water tank 12 is low and executes the normal dehydration operation. (C11).

  For example, when some trouble occurs in the heating unit 30, when bubbles are generated in the water in the water tank 12, or when the water supplied into the water tank 12 is low, the water in the water tank 12 is warm. The target water temperature for the washing operation may not be reached. However, even if the temperature is lower than the target water temperature of the warm water washing operation, if the water temperature exceeds 45 ° C., for example, the water tank 12 may be softened and may collide with the drum 13.

  According to the present embodiment, the control device 21 reaches the second reference temperature lower than the first reference temperature even when the water temperature in the water tank 12 does not reach the predetermined first reference temperature during the heating operation. If so, it is estimated that the temperature of the water tank 12 is high and softening occurs, and the low-speed dewatering operation is executed. Therefore, the collision between the water tank 12 and the drum 13 can be avoided more reliably, and the dehydration operation can be performed normally.

  The control device 21 also performs hot water washing when the water in the water tank 12 does not reach the predetermined first reference temperature and does not reach the second reference temperature lower than the first reference temperature during the heating operation. A normal dehydration operation is performed after the operation. If the water in the water tank 12 is lower than the first reference temperature and lower than the second reference temperature lower than the first reference temperature, it is estimated that the temperature of the water tank 12 is not so high, and the water tank 12 and the drum It is considered that collision with 13 is unlikely to occur. Therefore, in such a case, since it is less necessary to rotate the drum 13 at a low speed, the drum 13 can be rotated at a normal rotation speed to improve the dewatering performance, and the dewatering time and thus the operation can be improved. The overall required time can be shortened.

  Note that the normal dehydration operation is performed based on whether the temperature of the water in the water tank 12 has reached the first reference temperature or the second reference temperature during the warm water washing operation, not during the heating operation. And low-speed dehydration operation may be switched.

  Further, the control device 21 performs the normal dehydration operation when the water in the water tank 12 does not reach the predetermined first reference temperature and does not reach the second reference temperature lower than the first reference temperature. In this case, the number of times of the rinsing operation may be reduced as compared with the case where the low speed dewatering operation is performed. According to the normal dehydration operation, the dehydration can be sufficiently performed as compared with the low-speed dehydration operation. As a result, the rinsing performance in the subsequent rinsing operation is enhanced. Therefore, after the normal dehydrating operation, the rinsing performance can be sufficiently maintained even if the number of rinsing operations is reduced. In addition, the amount of water used can be reduced by reducing the number of times of rinsing operations, and a water saving effect can be expected. In addition, the amount of energy required for the rinsing operation can be reduced, and the overall operation time can be shortened.

  Further, in the present embodiment, an operation example in which the normal dehydration operation and the low-speed dehydration operation are switched based on two reference temperatures has been disclosed. However, based on one reference temperature or three or more reference temperatures. Based on the above, switching between the normal dehydration operation and the low-speed dehydration operation may be performed.

(Fourth embodiment)
In the operation example illustrated in FIG. 6, steps D1 to D7 are the same as steps A1 to A7 in FIG. Steps D9 to D15 are the same as steps A8 to A14 in FIG. In the present embodiment, when the drainage operation (D7) is completed, the control device 21 determines whether or not the temperature of the water in the water tank 12 is equal to or lower than a predetermined dehydration permission temperature (D8). The control device 21 detects the temperature of the water in the water tank 12 by the water temperature detection sensor 41 before executing the above-described draining operation (D7), that is, before the water in the water tank 12 is drained. In addition, the predetermined dehydration permission temperature that is the determination criterion in step D8 can be changed and set as appropriate. In this case, for example, 58 ° C. is set.

  For example, when the target water temperature of the warm water washing operation is high, the temperature of the water supplied into the water tank 12 in summer is high, such as 30 ° C., and the temperature of the water in the water tank 12 to be cooled is high. Alternatively, since the temperature of water used for cooling is high, there is a possibility that a sufficient cooling effect cannot be obtained even if the cooling stroke is executed.

  Therefore, when the temperature of the water in the water tank 12 is higher than the predetermined dehydration permission temperature (D8: NO), the control device 21 performs the cooling process (D5, D6) again. The control device 21 repeatedly executes the cooling process until the temperature of the water in the water tank 12 becomes equal to or lower than the dehydration permission temperature. And if the temperature of the water in the water tank 12 becomes below dehydration permission temperature (D8: YES), the control apparatus 21 will perform low-speed dehydration operation | movement (D9). That is, the control device 21 performs the dehydration operation on condition that the temperature of the water in the water tank 12 is equal to or lower than a predetermined dehydration permission temperature.

  According to the present embodiment, the temperature of the water in the aquarium 12, in other words, the temperature of the aquarium 12 can be sufficiently lowered before the dehydration operation can be performed, and the collision between the aquarium 12 and the drum 13 can be more reliably performed. This can be avoided, and the dehydration operation can be performed normally.

  In addition, when repeating the cooling operation a plurality of times, the control device 21 may detect the temperature of the water in the water tank 12 after each cooling operation. By determining whether or not the temperature of the water in the water tank 12 is equal to or lower than the dehydration permitted temperature based on the water temperature after each cooling operation, a more accurate determination can be made according to the actual water temperature. .

(Fifth embodiment)
In the operation example illustrated in FIG. 7, steps E1 to E7 are the same as steps A1 to A7 in FIG. Steps E12 to E18 are the same as steps A8 to A14 in FIG. In the present embodiment, when the drainage operation (E7) is completed, the control device 21 determines whether or not the number of executions of the cooling operation exceeds a predetermined number (E8). The predetermined number of times can be appropriately changed and set. In this case, four times is set. Moreover, the control apparatus 21 judges whether the temperature of the water in the water tank 12 is below predetermined dehydration permission temperature (E9). Step E9 is the same as step D8 in FIG.

  When the number of executions of the cooling operation does not exceed the predetermined number (E8: NO), the control device 21 determines whether or not the temperature of the water in the water tank 12 is equal to or lower than a predetermined dehydration permission temperature (E9). ). When the temperature of the water in the water tank 12 is higher than the predetermined dehydration permission temperature (E9: NO), the control device 21 increments the number of times of the cooling operation by one (E11), and again performs the cooling process. (E5, E6) is executed. As long as the number of executions of the cooling operation does not exceed the predetermined number (E8: NO), the control device 21 repeatedly executes the cooling process until the temperature of the water in the water tank 12 becomes equal to or lower than the dehydration permission temperature. And if the temperature of the water in the water tank 12 becomes below dehydration permission temperature (E9: YES), the control apparatus 21 will perform low-speed dehydration operation | movement (E12).

  On the other hand, when the number of executions of the cooling operation exceeds a predetermined number (E8: YES), the control device 21 executes an error notification operation (E10). In this error notification operation, the control device 21 displays error information indicating that the cooling of the water in the water tank 12 or the cooling of the water tank 12 is insufficient on a display unit of an operation panel (not shown). In addition, the control apparatus 21 is good also as a structure which outputs error information with an audio | voice. Moreover, the control apparatus 21 is good also as a structure which performs both the error alerting | reporting by a display and the error alerting | reporting by an audio | voice.

  According to the present embodiment, even if the cooling operation is repeatedly executed, the user can be notified that the water in the water tank 12, in other words, the water tank 12 could not be sufficiently cooled. In addition, it is possible to prevent the cooling operation from being repeatedly executed despite any abnormality occurring.

(Sixth embodiment)
As illustrated in FIG. 8, in the present embodiment, when the content of the driving course is a hot water washing operation → a rinsing operation → a dehydrating operation, that is, an operation content in which the rinsing operation is executed after the hot water washing operation. For example, 58 ° C. is set as the dehydration permission temperature. This dehydration permission temperature is an example of the first dewatering permission temperature. On the other hand, for example, 48 ° C. is set as the dehydration permission temperature when the content of the operation course is the hot water washing operation → dehydration operation, that is, the operation content in which the rinsing operation is not performed after the hot water washing operation. This dehydration permission temperature is an example of the second dewatering permission temperature, and a temperature lower than the first dewatering permission temperature is set.

  The driving course that does not include the rinsing operation has a shorter period for lowering the temperature of the water in the water tank 12, that is, the temperature of the water tank 12, by the time required for the rinsing operation than the driving course that includes the rinsing operation. Therefore, in the operation course that does not include the rinsing operation, the temperature of the water tank 12 may be high even after the entire operation is completed. Further, if the dehydrating operation is performed in such a state where the temperature of the water tank 12 is high, the water tank 12 and the drum 13 may collide.

  Therefore, in the present embodiment, the driving course that does not include the rinsing operation, that is, the driving course in which the temperature of the water tank 12 is less likely to decrease is more than the driving course that includes the rinsing operation, that is, the driving course in which the temperature of the water tank 12 tends to decrease. The dehydration permission temperature is set low. Thereby, even if it is an operation course in which the temperature of the water tank 12 is not easily lowered, the dehydration operation can be performed after the temperature of the water in the water tank 12, in other words, the temperature of the water tank 12 is sufficiently lowered. Therefore, it can be avoided that the temperature of the water tank 12 remains high after completion of the entire operation, and the dehydration operation can be avoided while the water tank 12 is softened.

(Seventh embodiment)
As illustrated in FIG. 9, in the present embodiment, the control device 21 virtually implements the storage processing unit 56 by software by executing a control program by the CPU. The storage processing unit 56 may be realized by hardware, or may be realized by a combination of software and hardware. The storage processing unit 56 is an example of a storage unit. When the temperature of the water in the water tank 12 reaches a predetermined high temperature, the storage processing unit 56 stores temperature height information indicating the arrival in the storage unit 45.

  As illustrated in FIG. 10, the control device 21 heats the water in the water tank 12 to the target temperature T1 during the heating operation. In this case, the target temperature T1 is set to 65 ° C., for example. When the water temperature in the water tank 12 reaches a predetermined high temperature T2 lower than the target temperature T1 in the process of heating the water in the water tank 12 to the target temperature T1, the storage processing unit 56 causes the storage device 56 to 12 stores temperature high information indicating that the water temperature in 12 has reached the high temperature T2. In this case, the predetermined high temperature T2 is set to 45 ° C., for example.

  When using a washing machine, the driving course is not always executed from the beginning to the end. That is, for example, when it is desired to reset the content of the driving course or when the driving course is to be restarted from the beginning, the driving may be stopped in the middle of the execution of the driving course. Therefore, the operation may be stopped after the water in the water tank 12 is heated by the heating operation. In this case, when the operation of only the dehydration operation is immediately started as the next operation, the dehydration operation is performed while the water temperature in the water tank 12 is high. Therefore, when the drum 13 is rotated at a normal rotation speed, the water tank 12 and the drum 13 are likely to collide with each other, and there is a possibility that the dehydrating operation cannot be performed normally.

  Therefore, when the temperature information is stored by the storage processing unit 56, that is, when the water in the water tank 12 is heated to a predetermined high temperature T2 or higher in the previous operation, the control device 21 is in the water tank 12. It is estimated that the water inside is likely to be at a high temperature, and a low-speed dewatering operation is performed as the dewatering operation. Thereby, it is possible to avoid the drum 13 from rotating at a normal rotation speed in the dehydration operation even though the temperature of the water in the water tank 12 is high, and the collision between the water tank 12 and the drum 13 is suppressed. Thus, the dehydration operation can be performed normally.

  For example, when the dehydrating operation is completed, the control device 21 clears the temperature high information stored in the storage unit 45. In this case, the control device 21 may be configured to clear the high temperature information on the condition that the driving course has been normally completed to the end, or the high temperature information on the condition that the cooling operation has been normally completed. May be configured to clear. The normal completion of the operation course means that the washing operation, the rinsing operation, the water supply operation, and the stirring operation are performed by the completion of the operation course. Therefore, there is a high possibility that the temperature of the water tank 12 is lowered, and it can be considered that normal operation can be performed even in a normal dehydration operation. In addition, the fact that the cooling operation has been completed normally means that the temperature of the water tank 12 has decreased, so that it is considered that the normal dehydration operation can be performed normally.

  FIG. 11 shows a control example in the case where the rotational speed of the drum 13 is changed in the dehydration operation based on the presence / absence of temperature high information. That is, for example, in the case of an operation course executed in the order of washing operation → rinse operation twice → dehydration operation, the rotation speed of the drum 13 in the first dehydration operation is 1000 rpm when temperature high information is stored, and temperature high information Is stored at 1200 rpm.

  Also, in the case of an operation course executed in the order of one rinsing operation → dehydration operation, the rotation speed of the drum 13 in the first dehydration operation is 1000 rpm when temperature high information is stored, and temperature high information is stored. If not, it is set at 1200 rpm.

  Also, in the case of an operation course in which only the dehydrating operation is performed, the rotation speed of the drum 13 in the first dehydrating operation is 1000 rpm when temperature high information is stored, and 1200 rpm when temperature high information is not stored. Is set.

  As described above, the maximum rotation speed in the first dewatering operation when temperature high information is stored is set lower than the maximum rotation speed in the first dewatering operation when temperature high information is not stored. Has been. As described above, by using the temperature high information and changing the rotation speed of the dehydration operation that is first performed after the operation is resumed, the dehydration operation can be performed at the rotation speed according to the temperature of the water tank 12.

(Eighth embodiment)
In the operation example illustrated in FIG. 12, step F7 is a drain operation similar to step A7 in FIG. 3 or step B7 in FIG. Step F12 is a shower rinsing operation similar to step A9 in FIG. 3 or step B11 in FIG. In the present embodiment, when the drainage operation (F7) is completed, the control device 21 checks whether temperature high information is stored (F8). And when the high temperature information is memorize | stored (F8: YES), the control apparatus 21 is the operation | movement which includes the washing | cleaning operation | movement by warm water more strictly, the period when the washing machine 10 is not operate | moving. It is determined whether or not there is a predetermined period or longer (F9).

  That is, when the operation is stopped during the execution of the operation course including the washing operation with warm water, the control device 21 starts measuring the elapsed time with a timer (not shown). In addition, as a case where driving | running | working is stopped in the middle of execution of a driving course, the case by the input of stop operation by a user, the case by a power failure, etc. can be considered, for example. In addition, the measurement of the elapsed time may be started from the time when the driving course is canceled, or may be started after a certain amount of time has elapsed from the time of cancellation. And if a driving | operation is restarted after that, the control apparatus 21 will stop the measurement of elapsed time, and will specify the period when the washing machine 10 is not operating. Note that the measurement of the elapsed time may be stopped when the operation is restarted, or may be stopped after a certain amount of time has elapsed from the restart time. And the control apparatus 21 will determine whether the period when the washing machine 10 is not operating continues for the predetermined period or more, if measurement of elapsed time is stopped. Note that the predetermined period can be appropriately changed and set. In this case, for example, three hours are set.

  When the period during which the washing machine 10 is not operating continues for a predetermined period or longer (F9: YES), the control device 21 clears the temperature high information and executes the normal dehydration operation (F11). The process proceeds to the shower rinsing operation (F12). Even when the temperature high information is not stored in step F8 (F8: NO), the control device 21 clears the temperature high information, executes the normal dehydration operation (F11), and performs the shower rinsing operation (F12). ). On the other hand, when the period during which the washing machine 10 is not operating has not continued for a predetermined period or longer (F9: NO), the control device 21 performs the low speed dewatering operation (F10) without clearing the temperature high information. Then, the process proceeds to the shower rinsing operation (F12).

  According to the present embodiment, even when temperature high information is stored (F8: YES), when a period during which the operation including the washing operation with warm water is not performed is continued for a predetermined period or longer. (F9: YES), normal dehydration operation is executed (F11). That is, even if temperature high information is recorded, if a long period of time has elapsed since the operation was stopped, the temperature of the water tank 12 is likely to be lowered, and it is necessary to perform a low-speed dewatering operation. The nature is low. According to the present embodiment, it is possible to avoid unnecessary low-speed dewatering operation being performed in such a case.

(Ninth embodiment)
As illustrated in FIG. 13, in this embodiment, the number of rinsing operations in the standard operation course that does not include the warm water washing operation is set to two. On the other hand, the number of rinsing operations in the warm water operation course including the warm water washing operation is set to 3 times. According to this setting content, the control device 21 causes the rinsing operation execution processing unit 52 to execute the rinsing operation three times in the hot water washing operation course and the rinsing operation twice in the standard operation course. That is, the number of rinsing operations in the warm water washing operation course is set to be larger than the number of rinsing operations in the standard operation course.

  In the warm water washing operation course, in order to avoid a collision between the water tank 12 and the drum 13 due to the softening of the water tank 12, a low-speed dewatering operation having a lower rotational speed than a normal dewatering operation is performed. Therefore, in the warm water washing operation course, the dehydration performance is lowered and the next rinsing operation is performed while water remains in the laundry. Therefore, the rinsing performance is reduced. In the present embodiment, the number of times of the rinsing operation is increased in the hot water washing operation course in which the rinsing performance may be lowered than in the standard operation course. Therefore, the decrease in the rinsing performance can be compensated, and the rinsing performance can be maintained.

(Other embodiments)
The present embodiment is not limited to the above-described embodiment, and can be expanded or modified as follows, for example.

  The warm water washing operation that can be performed by the washing operation execution processing unit 51 may be a washing operation in which warm water is supplied into the water tank 12 to wash the laundry. The hot water supplied into the water tank 12 may be, for example, hot water supply from a hot water supply facility in a house, bath water, or a hot water generation unit provided in the water supply mechanism 22, for example. It is good also as a structure which supplies the warm water which produces | generates. That is, various configurations can be adopted as long as the configuration can supply hot water in the water tank 12.

  Further, the heating operation execution processing unit 55 may be configured to execute a hot water supply operation for supplying hot water into the water tank 12 before the warm water washing operation. Also in this case, various configurations such as a configuration in which hot water is supplied from a hot water supply facility in a house, a configuration in which bath water is supplied into the water tank 12, and a configuration in which hot water is generated by a hot water generation unit can be employed.

  The water temperature detection operation for detecting the water in the water tank 12 can be performed by appropriately changing the execution timing. For example, the water temperature detection operation may be performed after the warm water washing operation or after the cooling operation. Moreover, when the water in the water tank 12 does not reach the predetermined reference temperature during the heating operation, the number of times of the rinsing operation may be reduced and the time of the rinsing operation may be shortened compared to the case where the water reaches the reference temperature. May be. The washing machine is not limited to a drum-type washing machine, and can be applied to a so-called vertical-axis type washing machine in which the central axis of the water tub and the rotating tub is directed in the vertical direction.

  Further, the water tank 12 may be at least partially made of resin, for example, around the bearing case that holds the rotating shaft of the drum 13, and need not be made entirely of resin. That is, the water tank 12 should just be the structure which has a part which is worried about softening with warm water.

  According to the washing machine according to the present embodiment, by controlling the maximum rotation speed of the rotating tub in the dehydrating operation performed after the hot water washing operation without depending on the washing water cooling operation for lowering the water temperature by supplying water from the water supply valve. The dehydration operation can be normally performed after the warm water washing operation.

  This embodiment is presented as an example and is not intended to limit the scope of the invention. The novel embodiment can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. This embodiment and its modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 10 is a washing machine, 12 is a water tub, 13 is a drum (rotary tub), 51 is a washing operation execution processing unit (washing operation execution means), 52 is a rinsing operation execution processing unit (rinsing operation execution means), and 53 is Dehydration operation execution processing section (dehydration operation execution means), 54 a cooling operation execution processing section (cooling operation execution means), 55 a heating operation execution processing section (heating operation execution means), and 56 a storage processing section (storage means). Show.

Claims (11)

A water tank at least partially made of resin;
A rotating tank provided in the water tank;
As washing operation for washing the laundry in the rotating tub, warm water in the aquarium or supplying warm water into the aquarium to wash the laundry, and warming the water in the aquarium Non-warm water washing operation for washing the laundry without washing, and washing operation execution means capable of performing
A dehydrating operation executing means for performing a dehydrating operation for rotating the rotating tub and dehydrating the laundry after the washing operation;
In the dehydrating operation performed after the hot water washing operation, the dehydrating operation executing means performs a low speed dewatering operation in which the maximum rotation speed of the rotating tub is lower than that in the normal dehydrating operation performed after the non-warm water washing operation. A cooling operation executing means for executing a cooling operation for cooling the water in the water tank after the warm water washing operation;
The washing machine according to claim 1, wherein the cooling operation executing means performs the cooling operation before the low-speed dewatering operation. The dehydration operation executing means is configured to execute the dehydration operation on condition that the temperature of water in the water tank is equal to or lower than a predetermined dehydration permission temperature,
The washing machine according to claim 2, wherein the cooling operation execution unit repeats the cooling operation until a temperature of water in the water tank becomes equal to or lower than the dehydration permission temperature.   The washing machine according to claim 3, wherein the cooling operation executing means detects a temperature of water in the water tank after the cooling operation. Rinsing operation executing means for rinsing the laundry in the rotating tub is further provided,
A first dehydration permission temperature is set as the dehydration permission temperature when the rinsing operation is performed after the warm water washing operation, and the first dehydration permission temperature when the rinsing operation is not performed after the hot water washing operation. The washing machine according to claim 3 or 4, wherein a second dehydration permission temperature lower than the first dehydration permission temperature is set.   The washing machine according to claim 5, wherein the rinsing operation execution means increases the number of times of the rinsing operation in the driving course including the hot water washing operation more than the number of times of the rinsing operation in the driving course not including the hot water washing operation. .   The washing machine according to any one of claims 1 to 6, wherein the dewatering operation executing means switches between the normal dewatering operation and the low speed dewatering operation based on a temperature of water in the water tank. Heating water in the water tank before the warm water washing operation, or further comprising a heating operation execution means for executing a heating operation to supply hot water into the water tank,
The dehydration operation executing means performs the normal dehydration operation after the warm water washing operation when the water in the water tank does not reach a predetermined reference temperature during the heating operation. The washing machine according to item. A heating operation executing means for executing a heating operation for heating the water in the water tank before the warm water washing operation;
The dehydration operation execution means, when the water in the water tank does not reach a predetermined first reference temperature during the heating operation, and does not reach a second reference temperature lower than the first reference temperature, The washing machine according to any one of claims 1 to 7, wherein the normal dehydration operation is performed after the warm water washing operation. Storage means for storing temperature high information indicating that the temperature of water in the water tank has reached a predetermined high temperature;
The washing machine according to any one of claims 1 to 9, wherein the dewatering operation executing means executes the low speed dewatering operation when the storage means stores the temperature high information.   The dehydrating operation executing means, when the period in which the operation including the washing operation is not executed is continued for a predetermined period or more, even if the storage means stores the temperature high information The washing machine according to claim 10, wherein a normal dehydration operation is performed.

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