JP2021049373A - Washing machine - Google Patents

Abstract

To provide a washing machine capable of reducing wrinkles of clothing and the like due to a dewatering step.SOLUTION: A washing machine includes: a washing tub; a rotary drum mounted on the inside of the washing tub and for storing laundry; and a control part 14 for controlling a washing step, a rinsing step and a dewatering step of the laundry. The control part 14 controls so that, after the dewatering step, the rotary drum performs normal rotation and reverse rotation alternately in a short cycle and performs the normal rotation and the reverse rotation at low speed respectively.SELECTED DRAWING: Figure 4

Description

The present invention relates to a washing machine.

In recent years, washing machines equipped with various functions have been developed. For example, there is a heater equipped with a heater to warm washing water or rinsing water for washing.
Patent Document 1 discloses a washing machine having a drying function. This washing machine uses warm water in the rinsing process in order to shorten the drying time due to the drying function.
Patent Document 2 also discloses a washing machine that uses hot water in the rinsing process. This washing machine uses hot water to improve rinsing performance and sprays hot water in a shower to reduce power consumption.

Japanese Patent No. 38808881 JP-A-2017-403

If the technique described in Patent Document 1 is used, it is expected that the drying time due to the drying function will be shortened, but there are some washing machines that do not have the drying function. In addition, even if you have a washing machine with a drying function, from the viewpoint of electricity costs, some users do not usually use the drying function and hang it on a clothesline or hanger to dry the laundry. There is also.
On the other hand, there is a desire to reduce wrinkles on clothes and the like due to the dehydration process.

Therefore, an object of the present invention is to provide a drum-type washing machine capable of reducing wrinkles of clothes and the like due to a dehydration step.

The washing machine of the present invention includes a washing tub, a rotating drum mounted inside the washing tub and accommodating laundry, and a control unit for controlling the washing step, rinsing step and dehydration step of the laundry. After the dehydration step, the control unit controls the rotating drum to alternately perform forward rotation and reverse rotation at low cycles, and to perform the forward rotation and the reverse rotation at low speeds, respectively.

In the washing machine of the present invention, wrinkles can be reduced by rotating the rotating drum alternately in a forward rotation and a reverse rotation at a low cycle, and by performing the forward rotation and the reverse rotation at low speeds, respectively.

It is a perspective view which shows the appearance of the drum type washing machine 1 which concerns on this embodiment. It is sectional drawing of the drum type washing machine 1. It is an enlarged view of the operation panel 7. It is a block diagram which shows the functional structure of the drum type washing machine 1. It is a flowchart which shows the operation of a room drying course. It is a timetable showing the time required for each process performed in the standard course, the room drying 40 ° C course, and the room drying 50 ° C course. It is a flowchart which shows the operation of the final rinsing procedure. It is a flowchart which shows the operation of the 1st rinsing process. It is a flowchart which shows the operation of the 2nd rinsing process. It is a figure for demonstrating temperature control and motor control performed in a room drying course. (A) It is a graph for demonstrating temperature control and motor control when a water temperature is higher than 15 degreeC. (B) It is a figure for demonstrating temperature control and motor control when a water temperature is less than 15 degreeC. It is a figure for demonstrating the effect of the drum type washing machine 1 which concerns on this embodiment.

<Overview>
The washing machine according to one aspect of the embodiment includes a washing tub, a rotating drum mounted inside the washing tub and accommodating laundry, and a control unit for controlling the washing step, rinsing step and dehydration step of the laundry. The washing step is provided with a raising means for heating the water supplied to the washing tub to raise the water temperature, and the rinsing step repeats at least a water supply procedure, a rinsing procedure and a draining procedure a plurality of times. In the rinsing step, the final rinsing procedure is performed by the motor control including the first motor control and the second motor control in which the rotation time of the rotating drum is longer than that of the first motor control, and the control unit is used. Performs the second motor control at least once in the final rinsing procedure.
The washing machine according to one aspect of the embodiment includes a washing tub, a rotating drum mounted inside the washing tub and accommodating laundry, and a control unit that controls a washing step, a rinsing step, and a dehydration step of the laundry. After the dehydration step, the control unit controls the rotating drum to alternately perform forward rotation and reverse rotation at low cycles, and to perform the forward rotation and the reverse rotation at low speeds, respectively. To do.
In the washing machine according to one aspect of the embodiment, the control unit performs the final rinsing procedure in the rinsing step using hot water in a predetermined temperature range, and the rotating drum rotates and does not rotate. Controlled to be periodic, in the final rinsing procedure, the ratio of the rotational and non-rotational operating times in the second motor control is that of the rotational and non-rotational in the first motor control. It is set larger than the operating time ratio.
The washing machine according to one aspect of the embodiment includes a heating means for heating the water supplied to the washing tub to raise the water temperature, and the control unit determines the final rinsing procedure in the rinsing step. While using hot water in the temperature range, the rotating drum is controlled to periodically perform rotating and non-rotating operations, and the control unit sets the rotating and non-rotating operating times to a constant ratio. The final by motor control including the first motor control and the second motor control in which the ratio of the rotating and the non-rotating operating time is larger than the ratio of the operating time in the first motor control. Perform the rinsing procedure.
In the washing machine according to one aspect of the embodiment, the control unit performs the final rinsing procedure by the motor control based on the temperature T of the water supplied in the final rinsing procedure of the rinsing step.
In the washing machine according to one aspect of the embodiment, the control unit sets the number of times of the second motor control from on to off of the temperature raising means to the temperature as compared with the case where the temperature T is larger than the threshold value. This is often done when T is below the threshold.
The washing machine described in the specification is a washing machine including a control unit that controls a washing process, a rinsing process, and a dehydration process of laundry, and the rinsing process involves at least a plurality of water supply procedures, rinsing procedures, and draining procedures. Repeatedly, the control unit performs the final rinsing procedure in the rinsing step using hot water in a predetermined temperature range, and sets the rinsing time longer than the rinsing time of other rinsing procedures before the final rinsing procedure. Control to do so.

In the washing machine described in the specification, the control unit performs the final rinsing procedure in the rinsing step using hot water in a predetermined temperature range, and sets the rinsing time to that of other rinsing procedures prior to the final rinsing procedure. It is controlled so that it takes more than twice as long as the rinsing time. In this way, by using warm water for the final rinsing procedure and rinsing for a longer time than usual, the drying time due to room drying can be shortened. This makes it possible to suppress the generation of a dry odor regardless of the type of laundry detergent or the like.
In the washing machine described herein, the temperature range of hot water used in the final rinsing procedure is 30 ° C to 60 ° C. This makes it possible to select hot water at an appropriate temperature according to the type of laundry (clothing) such as the characteristics of the fabric.

In the washing machine described in the specification, in the rinsing step, a water supply procedure, a rinsing procedure, a drainage procedure, and a dehydration procedure are performed at least once before the final rinsing procedure, and the control unit performs the final rinsing procedure. The dehydration time of the dehydration step performed after the procedure is controlled to take longer than the dehydration time of the dehydration procedure performed after the other rinsing procedures. By performing the dehydration step over a long period of time in this way, the drying time due to room drying can be shortened.
In the washing machine described herein, the control unit controls the dehydration step to be performed for 10 to 25 minutes after the final rinsing procedure. As described above, by performing the dehydration step of 10 to 25 minutes, which is longer than the dehydration step performed by a general washing machine, the drying time by drying the room can be shortened.

The washing machine described in the specification is the temperature at which the washing tub, the rotating drum mounted inside the washing tub and accommodating the laundry, and the water supplied to the washing tub are used in the final rinsing procedure. The control unit includes a heating means for raising the temperature to a range, and the control unit causes the washing tub to stir the laundry for 10 minutes or more after raising the water supplied to the washing tub to the temperature range. To control. In this case, hot water can be used in the final rinsing procedure even if there is no water heater or the like capable of supplying hot water at the place where the washing machine is installed. Further, by stirring the laundry over time after raising the temperature of the supplied rinse water, the stirring and infiltration of hot water can be performed evenly.

In the washing machine described in the specification, the control unit controls the rotating drum to periodically perform rotating and non-rotating operations in the final rinsing procedure, and the heating means is the washing tub. While the water supplied to the washing tub is raised to the temperature T1 included in the temperature range, the rotation time and the non-rotation time of the rotating drum are substantially the same, and the temperature raising means is supplied to the washing tub. After raising the water to the temperature T1, the rotation time of the rotating drum is longer than the non-rotation time until the hot water at the temperature T1 reaches the temperature T2 (<T1) included in the temperature range. .. As a result, the temperature of the rinse water can be raised while suppressing temperature unevenness between clothes.

In the washing machine described in the specification, in the final rinsing procedure, the control unit controls the rotating drum to periodically perform rotating and non-rotating operations, and the heating means controls the washing tub. While the water supplied to the washing tub is raised to the temperature T4 included in the temperature range, the rotation time and the non-rotation time of the rotating drum are substantially the same, and the temperature raising means is supplied to the washing tub. After the water is raised to the temperature T4, the hot water at the temperature T4 is further raised to the temperature T3 (> T4) included in the temperature range, and the hot water at the temperature T3 becomes the temperature T4. Until then, the rotation time of the rotating drum is longer than the non-rotation time. As a result, the temperature of the water in the washing tub can be raised while suppressing temperature unevenness between clothes. For example, when the temperature of tap water is low, such as in winter, by controlling the rotation and non-rotation of the rotating drum in this way, it is possible to more effectively suppress temperature unevenness between clothes.

In the washing machine described in the specification, in the washing machine, after the dehydration step, the rotating drum alternately performs forward rotation and reverse rotation in a low cycle, and the forward rotation and the reverse rotation are performed at low speed, respectively. Control to do with. Thereby, wrinkles of clothes due to a long-time dehydration process can be reduced.

The washing machine described in the specification is provided with an operation input unit that accepts the selection of one washing course from a plurality of types of washing courses from the user, and the plurality of types of washing courses use water at room temperature for the final rinsing procedure. The standard course and the final rinse procedure are performed using warm water, and the rinse time is longer than the rinse time of the final rinse procedure performed in the standard course, and the final rinse is performed. A room drying course is provided in which the time of the dehydration step performed after the procedure is longer than the time of the dehydration step performed after the final rinsing procedure performed in the standard course. In this case, when the room drying course is selected in the operation input unit, the drying time due to room drying can be shortened by performing control different from the standard course. This makes it possible to suppress the generation of a dry odor regardless of the type of laundry detergent or the like.

<Embodiment>
1. 1. Configuration of Drum-type Washing Machine The configuration of a drum-type washing machine (hereinafter referred to as a washing machine) will be described with reference to FIGS. 1 and 2.
The washing machine 1 is called a horizontal drum washing machine. The washing machine 1 includes a housing 2, a washing tub 3, a rotating drum 4 housed in the washing tub 3 and into which laundry such as clothes is put, and a door 6 for opening and closing the opening of the washing tub 3. There is.

As shown in FIG. 1, the housing 2 has a box shape, and an opening for throwing laundry into the rotating drum 4 is formed in a substantially central portion of the front panel 2a. Further, the front panel 2a includes an operation panel 7 and a detergent charging case 8. Details of the operation panel 7 will be described later.
The washing tub 3 is elastically vibration-proof supported in the housing 2 and has an opening 3c on the front surface. As shown in FIG. 2, the portion forming the opening 3c includes a folded portion that is folded outward in a circular shape. The washing tub 3 is divided into a front portion 3a and a rear portion 3b, and these are connected to form a bottomed cylindrical shape as a whole. Although the central axis of the washing tub 3 shown in FIG. 2 is arranged horizontally, it may be arranged so as to be slightly lowered and inclined from the front to the rear. In the description of the washing tub 3, the rear side of the washing tub 3 in the horizontal state is the bottom side.

A motor 10 for rotating the rotating drum 4 around the rotating shaft 10a is provided at the center of the bottom surface of the washing tub 3. Further, a heater insertion port is provided on the bottom surface of the washing tub 3, and a heater 11 for heating the water supplied to the washing tub 3 is inserted into the heater insertion port. Here, as the heater 11, a sheathed heater having excellent heat conduction and being waterproofed is used. As an example, the power consumption of the heater 11 is 800 W, and it takes 2.6 minutes to raise the water temperature of the water supplied to the washing tub 3 by 1 ° C. Further, a water temperature sensor 12 for measuring the temperature of water inside the washing tub 3 is provided in connection with the heater 11 or in the vicinity of the heater 11.

The rotary drum 4 has a bottomed tubular shape, is connected to a motor 10 provided at the bottom of the washing tub 3, and is rotatably supported in the washing tub 3. The rotation center axis of the rotary drum 4 coincides with the center axis of the washing tub 3.
Laundry is housed in the cylindrical portion 4b of the rotating drum. Further, the opening 4a of the rotating drum 4 is smaller than the inner diameter of the cylindrical portion 4b. A plurality of through holes 4c for passing water are formed in the peripheral wall of the cylindrical portion 4b. Washing water and rinsing water can freely move between the washing tub 3 and the rotating drum 4 through the through hole 4c.

The door 6 is provided in the housing 2 so as to be openable and closable. The door 6 is openably and closably supported by a hinge extending in the vertical direction provided on the front panel 2a of the housing 2.
The door 6 has a double structure including an outer transparent window 6a made of transparent glass or a transparent resin and an inner light transmitting convex portion 6b. The bottom of the light-transmitting convex portion 6b is provided with a contact portion to which the gasket 5 is in close contact. The door 6 can see the state of the laundry in the rotating drum 4 from the translucent window.

A gasket 5 is provided between the opening of the washing tub 3 and the door 6. The gasket 5 is made of an elastic material, for example, a rubber material. As shown in FIG. 2, the gasket 5 has a cylindrical shape, and one end side of the cylindrical shape is fixed to the front end portion of the washing tub 3 on the opening 3c side. Further, the other end side of the cylinder is in contact with the door 6. The gasket 5 absorbs vibrations during washing and dehydration, and performs a waterproof function and a vibration-proof function for the housing 2. Here, the gasket 5 is provided with a recess 5a projecting outward in the radial direction in order to facilitate expansion and contraction of the cylinder in the length direction and to easily absorb vibration.

As shown in FIG. 3, the operation panel 7 includes a power button 7a, a start button 7b, a course selection dial 7c, and a setting display unit 7d.
The power button 7a is a button for turning on and off the power of the washing machine 1. The start button 7b is a button for starting and pausing the operation of the washing machine 1. The course selection dial 7c is a dial for setting a washing course desired by the user from a plurality of washing courses. Here, the course selection dial 7c includes a course lamp associated with each course. The setting display unit 7d sets washing conditions, washing time, etc., and displays the setting conditions and the status of the washing process.
The courses that can be set by the user in the washing machine 1 include, for example, a standard course, a hand-washing course, an elaborate course, a hurry course, etc. In addition to these, the room drying course, which is a feature of the present embodiment, can be set. It has become.

The room drying course consists of two courses, for example, the "room drying 40 ° C course" that uses hot water at about 40 ° C for the final rinse and the "room drying 50 ° C course" that uses hot water at about 50 ° C for the final rinse. You can choose. In the room drying course, it is possible to shorten the drying time after washing by using hot water at 40 ° C. or 50 ° C. for the final rinse.
For example, when setting a room drying 50 ° C. course, the user first presses the power button 7a and then turns the course selection dial 7c to select room drying at about 50 ° C. rinsing. At this time, the course lamp at the position corresponding to "rinse at about 50 ° C." lights up. After that, if the start button 7b is pressed, the washing of the room drying 50 ° C. course starts.

2. Functional configuration of the washing machine 1 A control unit 14 housed in a waterproof case (not shown) is provided on the back side of the operation panel 7 inside the housing 2. FIG. 4 is a functional block diagram showing a functional configuration of the washing machine 1 including the control unit 14.
The washing machine 1 includes an operation panel 7, a heater 11, a water temperature sensor 12, a storage unit 13, a control unit 14, a motor drive unit 15, a water level sensor 16, a timer 17, a voice output unit 18, a water supply control unit 19, and a drainage control unit 20. And a door lock device 21.
The storage unit 13 includes an EEPROM, a RAM, and the like. The storage unit 13 stores computer programs for performing the processes included in the various washing courses. Further, the storage unit 13 stores various parameters and various control flags used for executing the computer program.

The control unit 14 is composed of a microcomputer and controls the entire washing machine 1 by executing a computer program stored in the storage unit 13.
The motor drive unit 15 drives the motor 10 according to a control signal from the control unit 14. The motor drive unit 15 includes a rotation sensor for detecting the rotation speed of the motor 10, an inverter circuit, and the like, and adjusts the drive power so that the motor 10 rotates at the target rotation speed set by the control unit 14. When the room drying course is selected, the motor drive unit 15 performs the first motor control and the second motor control, which will be described later, according to the control signal from the control unit 14. Further, the motor drive unit 15 calculates the weight of the laundry housed inside the washing tub 3 by detecting the load of the motor 10.
The water level sensor 16 detects the water level of the washing water and the rinse water inside the washing tub 3 and outputs a water level detection signal corresponding to the detected water level to the control unit 14.

When the user operates various buttons, the course selection dial 7c, and the setting display unit 7d, the operation panel 7 outputs an input signal corresponding to the operated button or dial to the control unit 14. The voice output unit 18 outputs a voice such as a buzzer sound for notifying the user at the end of washing or when an error occurs according to the control signal from the control unit 14.
The water supply control unit 19 controls the opening and closing of a water supply valve (not shown) according to the control signal from the control unit 14. The drainage control unit 20 controls the opening and closing of a drainage valve (not shown) according to the control signal from the control unit 14. The door lock device 21 locks and unlocks the door 6 according to a control signal from the control unit 14.

3. 3. Detailed explanation of the room drying course Here, the details of the room drying course will be described with reference to FIGS. 5 to 11.
(1) Overall operation of the room drying course FIG. 5 is a flowchart showing the operation of the room drying course. This operation is executed when the user sets the room drying 40 ° C. course or the room drying 50 ° C. course using the operation panel 7 and presses the start button 7b.
As shown in the figure, in the room drying course, the washing machine 1 performs a water supply procedure of supplying washing water to the washing tub 3 (step S1), then a washing procedure (step S2) and a drainage procedure (step S3). ) And the dehydration procedure (step S4). Steps S1 to S4 are referred to as "washing steps". Subsequently, the washing machine 1 performs the water supply procedure (step S5), the rinsing procedure 1 (step S6), the drainage procedure (step S7), and the dehydration procedure (step S8) in this order. Steps S5 to S8 are referred to as "first rinsing step".

Subsequently, the washing machine 1 performs the water supply procedure (step S9), the rinsing procedure 2 (step S10), the drainage procedure (step S11), and the dehydration procedure (step S12) in this order. Steps S9 to S12 are referred to as a "second rinsing step".
Subsequently, the washing machine 1 performs the water supply procedure (step S13), the final rinsing procedure (step S14), and the drainage procedure (step S15) in this order. In the final rinsing procedure, the rinse water supplied to the washing tub 3 by the water supply procedure is stirred using warm water whose temperature has been raised to about 40 ° C. or about 50 ° C. Steps S13 to S15 are referred to as "final rinsing steps".
Next, the washing machine 1 performs a dehydration step (step S16), and finally a wrinkle removing step (step S17). In the wrinkle removing step, in order to reduce the wrinkles of clothes due to the dehydration step, the motor 10 is repeatedly rotated forward and backward at a low cycle of about 46 rpm for 3 minutes. This makes it easier for the clothes to come loose and reduces the sticking of the cloth, which is the cause of wrinkles.
As described above, the room drying course includes a plurality of rinsing steps, and the final rinsing procedure involves rinsing (stirring) with warm water.

(2) Timetable FIG. 6 is a timetable 100 showing the processing time of each process and each procedure described with reference to FIG. Here, in addition to the room drying 40 ° C course and the room drying 50 ° C course, the processing time of the standard course is also described for comparison.
As shown in the timetable 100, the room drying 40 ° C. course carries out the rinsing procedure included in the final rinsing step for 73 minutes, and the room drying 50 ° C. course carries out the rinsing procedure included in the final rinsing step for 93 minutes. This is 20 times longer than the 3 minutes of the rinsing procedure 1 and the rinsing procedure 2 included in the first and second rinsing steps. Moreover, it is 20 times longer than the rinsing procedure of the standard course.
Further, the difference between the room drying course and the standard course is that, in addition to the rinsing process, the dehydration process is performed for 10 minutes in the standard course, whereas the dehydration process is performed for 20 minutes in the room drying course.

If the dehydration step is carried out for a long time, the dehydration rate of the laundry increases, so that the drying time after dehydration is considered to be shortened. However, in reality, as the dehydration rate increases, the temperature of the clothes tends to decrease, and as a result, the drying time tends to increase. Therefore, in the room drying course of the present embodiment, the dehydration step is performed for 20 minutes as a suitable time during which the temperature of the clothes can be raised by using warm water to suppress the decrease in the temperature of the clothes while increasing the dehydration rate. As a result, the drying time after dehydration can be shortened.
In general, the laundry tends to be biased inside the washing tub 3, and rinsing and dehydration tend to be uneven. However, in the room drying course of the present embodiment, even if the laundry is biased due to agitation using warm water for a long time in the final rinsing procedure and a long-time dehydration step, the laundry is biased. The rinsing rate and dehydration rate are less likely to be uneven. Further, by using warm water and improving the dehydration rate, the sticking between clothes can be reduced and wrinkles can be suppressed.

(3) Operation of the final rinsing procedure Next, the details of the final rinsing procedure will be described. FIG. 7 is a flowchart showing the details of step S14 of FIG. As shown in the figure, the water temperature sensor 12 measures the water temperature T of the rinse water supplied to the washing tub 3 (step S21).
When the water temperature T is higher than 15 ° C. (Y in step S22), the washing machine 1 performs the first rinsing process (step S23). When the water temperature T is 15 ° C. or lower (N in step SS22), the washing machine 1 performs the second rinsing process (step S24).

(4) Detailed operation of the first rinsing process Next, the details of the first rinsing process will be described. FIG. 8 is a flowchart showing the details of step S23 of FIG. Table 200 of FIG. 10 shows each value used in the first rinsing process and the second rinsing process.
The control unit 14 turns on the heater 11 (step S31) and starts heating the rinse water supplied to the washing tub 3. Next, the water temperature sensor 12 measures the water temperature T of the supplied rinse water (step S32), and outputs the measured water temperature T to the control unit 14.
The control unit 14 compares the water temperature T with the preset temperature T1. Here, as shown in FIG. 10, in the case of the 40 ° C. course, T1 = 43 ° C., and in the case of the 50 ° C. course, T1 = 53 ° C. When T <T1 (N in step S33), the control unit 14 instructs the motor drive unit 15 to control the first motor, and controls the rotation and non-rotation of the motor 10 (step S34). Here, as shown in FIG. 10, in the first motor control, the motor 10 repeatedly operates for 7 seconds of rotation / 7 seconds of non-rotation (stop).

After that, the process returns to step S32, and the processes from step S32 to step S34 are repeated periodically, for example, every 10 seconds.
When the temperature of the supplied rinse water rises and T ≧ T1 (Y in step S33), the process proceeds to step S35, and the control unit 14 turns off the heater 11 (step S35). After that, the control unit 14 instructs the motor drive unit 15 to control the second motor, and changes the rotation and non-rotation times of the motor 10 (step S36). Here, as shown in FIG. 10, in the second motor control, the motor 10 repeatedly operates for 20 seconds of rotation / 4 seconds of non-rotation.

Next, the water temperature sensor 12 measures the water temperature T of the supplied rinse water (step S37), and outputs the measured water temperature T to the control unit 14.
The control unit 14 compares the water temperature T with the preset temperature T2. Here, as shown in FIG. 10, in the case of the 40 ° C. course, T2 = 40 ° C., and in the case of the 50 ° C. course, T2 = 50 ° C. When T> T2 (N in step S38), the process returns to step S36, and the processes from step S36 to step S38 are repeated periodically, for example, every 10 seconds. After that, when T ≦ T2 (Y in step S38), the process ends.

(5) Detailed Operation of the Second Rinse Process Next, the details of the second rinse process will be described with reference to FIG. FIG. 9 is a flowchart showing the details of step S24 of FIG.
The control unit 14 turns on the heater 11 (step S41) and starts heating the rinse water supplied to the washing tub 3. Next, the water temperature sensor 12 measures the water temperature T of the supplied rinse water (step S42), and outputs the measured water temperature T to the control unit 14.

The control unit 14 compares the water temperature T with the preset temperature T4. Here, as shown in FIG. 10, in the case of the 40 ° C. course, T4 = 35 ° C., and in the case of the 50 ° C. course, T4 = 45 ° C. When T <T4 (N in step S43), the control unit 14 instructs the motor drive unit 15 to control the first motor, and controls the rotation and non-rotation of the motor 10 (step S44). As shown in FIG. 10, in the first motor control, the motor 10 repeatedly performs the operation of 7 seconds of rotation / 7 seconds of non-rotation as in the first rinsing process.
After that, the process returns to step S42, and the processes from step S42 to step S44 are periodically repeated, for example, every 10 seconds.
When the temperature of the supplied rinse water rises and T ≧ T4 (Y in step S43), the control unit 14 instructs the motor drive unit 15 to control the second motor, and the motor 10 is rotated and non-rotated. The rotation time is changed (step S45). As shown in FIG. 10, at the time of the second motor control, the motor 10 repeatedly performs the operation of 20 seconds of rotation / 4 seconds of non-rotation as in the first rinsing process.

Next, the water temperature sensor 12 measures the water temperature T of the supplied rinse water (step S46), and outputs the measured water temperature T to the control unit 14.
The control unit 14 compares the water temperature T with the preset temperature T3. Here, as shown in FIG. 10, in the case of the 40 ° C. course, T3 = 38 ° C., and in the case of the 50 ° C. course, T3 = 48 ° C. When T <T3 (N in step S47), the process returns to step S45, and the processes from step S45 to step S47 are periodically repeated, for example, every 10 seconds. When the water temperature of the rinse water further rises and T ≧ T3 (Y in step S47), the control unit 14 turns off the heater 11 (step S48). After that, the control unit 14 instructs the motor drive unit 15 to continuously control the second motor, and controls the rotation and non-rotation of the motor 10 (step S49).

Next, the water temperature sensor 12 measures the water temperature T of the supplied rinse water (step S50), and outputs the measured water temperature T to the control unit 14.
The control unit 14 compares the water temperature T with the temperature T4. When T> T4 (N in step S51), the process returns to step S49, and the processes from step S49 to step S51 are periodically repeated, for example, every 10 seconds. After that, when T ≦ T4 (Y in step S51), the process ends.
FIG. 11A is a diagram showing the temperature change of the rinse water in the first rinse process, the passage of the rinse time, and the switching timing of the motor control. FIG. 11B is a diagram showing the temperature change of the rinse water in the second rinse process, the passage of the rinse time, and the switching timing of the motor control.

In the room drying course, the rinse water supplied to the washing tub 3 is heated by the heater 11, but it takes time to raise the temperature to about 40 ° C or about 50 ° C. During that time, the washing machine 1 controls the first motor and performs the rinsing process while stirring the laundry. Then, after the water temperature has risen to a certain extent, the temperature unevenness between clothes is suppressed by changing to the second motor control so that the motor rotation time becomes longer.
The second motor control is an important step of raising the temperature of the laundry in a state where the temperature unevenness is low. The time of the second motor control is preferably 10 minutes or more, preferably 20 minutes or more. The first motor control time is the time required to heat the rinse water supplied to the washing tub 3 to raise the temperature to about 40 ° C. or about 50 ° C., and this time is the time required for the heater 11 to be used. It also depends on the characteristics. The time for controlling the first motor can be shortened by replacing the heater 11 with a heater for higher power.
4. Effect of Room Drying Course The table 300 shown in FIG. 12 shows the passage of time and the drying rate of the laundry when the laundry is dried in the room after the room drying 50 ° C. course is executed. Table 400 shows the passage of time and the drying rate of the laundry when the laundry is dried in the room after performing the standard course.

In each case, the drying rate and the average value thereof when executed twice are described. The drying rate (%) here is shown as the weight of only clothes when the weight of the entire laundry (total of clothes and water) is 100. A drying rate of 92% or more is a state in which it can be determined that the laundry is dry. Therefore, the shorter the time until the drying rate reaches 92% or more, the more the generation of the dry odor can be suppressed.
As shown in the table 300, in the room drying 50 ° C. course, the drying rate becomes 92.8% 5 hours after the start of room drying and 94.8% after 6 hours. On the other hand, as shown in Table 400, in the case of the standard course, it takes 8 hours for the drying rate to reach 92.4%, and 9 hours for the drying rate to reach 94.4%.
As described above, in the room drying course of the present embodiment, the final rinsing procedure using warm water is performed for a long time, and the dehydration step is also performed for a long time to improve the dehydration rate of the laundry at the end of washing. Can be done. When the laundry starts to dry, it is warm and has a high dehydration rate, so the laundry dries 2-3 hours faster than the conventional standard course. Therefore, the growth of various germs can be suppressed, and the generation of a dry odor can be suppressed.

Further, as shown in FIG. 6, the room drying course requires a longer course operation time than the standard course in the final rinsing procedure and the dehydration process. However, since the drying time is significantly shortened, the total time required from the start of washing to drying is shorter in the room drying course.
Specifically, the room drying 40 ° C. course takes about 1 hour and 20 minutes longer than the standard course, but the drying time is about 2 hours shorter. As a result, the total reduction is 40 minutes. The room drying 50 ° C course takes about 1 hour and 40 minutes longer than the standard course, but the drying time is about 3 hours shorter. As a result, the total time is reduced by 1 hour and 20 minutes.

4. Modification Example Here, a modification of the embodiment will be described. The present invention is not limited to the above embodiment, and the following cases are also included in the present invention.
(1) In the above embodiment, the washing machine 1 is provided with a heater 11 and the rinse water used in the final rinsing procedure is heated by the heater 11, but the heater 11 is replaced with the washing machine 1. It may be configured to use a hot water generator of the body.
Further, the hot water used for the final rinsing procedure may be supplied from an external water heater (water heater or the like). In this case, if the generation of hot water is started in advance and the hot water is prepared before the washing machine 1 enters the final rinsing procedure, the washing time described in the above embodiment can be shortened. ..
Further, when using a hot water generator, an external water heater, or the like, it is desirable that the washing machine 1 is provided with a hot water storage unit for temporarily storing rinse water. This makes it easy to adjust the temperature and amount of hot water used in the final rinsing procedure.

(2) In the final rinsing procedure, the amount of water used may be larger than in other rinsing procedures. As a result, it is possible to suppress the agglomeration of the laundry and enhance the warm water infiltration effect.
(3) In the final rinsing procedure, the washing machine 1 of the above embodiment selects the first rinsing treatment or the second rinsing treatment depending on whether the water temperature T is 15 ° C. or lower or higher than 15 ° C. It was a configuration to execute. However, this configuration is an example. In the final rinsing procedure performed by the washing machine 1, the periodic operation of rotation / non-rotation (stop) of the motor 10 may be constant regardless of the water temperature T.
(4) Further, the boundary value of the water temperature after water supply when selecting the first rinsing treatment or the second rinsing treatment is not limited to 15 ° C. In addition, two or more boundary values may be used to determine the rinsing process to be performed. As an example, 10 ° C. and 20 ° C. may be used as the boundary values, and the three rinsing treatments 1 to 3 may be selectively executed.

(5) The conditions of the final rinsing procedure may be changed depending on the water temperature after water supply. For example, when the water temperature is high, the rinsing time may be shortened.
(6) The time required for the final rinsing procedure was 73 minutes for the 40 ° C. course and 93 minutes for the 50 ° C. course, but this is an example and is not limited to this required time. The final rinsing procedure in the present invention may take several times longer than the time required for the normal rinsing procedure. As an example of several times, it is preferably in the range of 2 to 35 times from the viewpoint of improving the rinsing rate and shortening the drying time.
In addition, the room drying course has two courses, a 40 ° C course and a 50 ° C course, but this is an example, and there is no limitation on these two courses, and one course may be used. There may be 3 or more courses.
Further, the temperature setting is not limited to 40 ° C. and 50 ° C., and may be 30 ° C. or 60 ° C., or may be set more finely. However, considering the temperature of the laundry when it is taken out from the washing machine and the damage of the laundry during washing, the temperature is preferably in the range of 30 to 60 ° C.
When the temperature of the rinse water reaches the set value of 40 ° C. or 50 ° C., the heater 11 is turned off, but the heater 11 may be weakened (the amount of heating is reduced) to be continuously heated.

(7) The dehydration process of the room drying course was carried out for 20 minutes, which is twice the normal time, which is an example. The washing machine 1 may be configured to perform the dehydration process for the same time as the normal course. However, considering the shortening of the drying time when drying the room and the damage to the laundry, the range of 15 minutes to 25 minutes is preferable.
Further, the wrinkle removing step after dehydration performed in the above embodiment is an optional step and is not an essential step. Further, the wrinkle removing process described in the above embodiment is a step of repeatedly performing forward rotation and reverse rotation of the motor 10 at a low cycle of about 46 rpm for 3 minutes, but the rotation speed and rotation time of the motor 10 are also the same. It is not limited to.

(8) The first motor control and the second motor control described with reference to FIGS. 10 and 11 are examples. In both the first motor control and the second motor control, the ON (rotation) / OFF (non-rotation) time period of the motor 10 is not limited to this value.
(9) As described with reference to FIG. 11, the first motor motor control and the second motor control of the final rinsing procedure of the embodiment are the first hot water period (normal temperature → minimum set value) and the second hot water period. Includes (minimum set value → maximum set value) and third hot water period (maximum set value → minimum set value). The main purpose of the first hot water period is to agitate the rinse water, and the main purpose of the second hot water period and the third hot water period is to infiltrate the laundry with hot water.
Here, in the above embodiment, the first hot water period, the second hot water period, and the third hot water period are performed once each, but after the first hot water period, the second hot water period and the third hot water period are performed. The period may be repeated multiple times.
(10) The present invention can also be applied to a drum-type washer-dryer and a vertical-type washing machine other than the drum-type.
(11) The above-described embodiments and modifications may be combined.

1 Washing machine (drum type washing machine)
2 Housing 3 Washing tub 4 Rotating drum 5 Gasket 6 Door 7 Operation panel 8 Detergent injection case 10 Motor 11 Heater 12 Water temperature sensor 13 Storage unit 14 Control unit 15 Motor drive unit 19 Water supply control unit 20 Drainage control unit 21 Door lock device

Claims (3)

The washing tub and
A rotating drum mounted inside the washing tub and accommodating laundry,
It is provided with a control unit that controls the washing process, rinsing process, and dehydration process of the laundry.
After the dehydration step, the control unit controls the rotating drum to alternately perform forward rotation and reverse rotation at low cycles, and to perform the forward rotation and the reverse rotation at low speeds, respectively. A heating means for heating the water supplied to the washing tub to raise the water temperature is provided.
The washing machine according to claim 1, wherein the control unit controls the final rinsing procedure in the rinsing step so as to perform the final rinsing procedure using hot water heated by the heating means. The control unit has a first motor control in which the rotation and non-rotation times of the rotating drum are set to a constant ratio, and the rotation time is the non-rotation time as compared with the first motor control. The washing machine according to claim 2, wherein the final rinsing procedure is performed by a motor control including a longer second motor control.

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