JP7128606B2 - washing machine - Google Patents

Description

Embodiments of the present invention relate to washing machines.

For example, as disclosed in Patent Literature 1, a washing machine is being considered that enables washing of laundry using not only powder detergent but also liquid detergent.

JP 2011-200524 A

Unlike powdered detergents, liquid detergents have almost no need to worry about undissolved residues in water. Therefore, in recent years, the use of liquid detergents has become mainstream.
Therefore, the present invention provides a washing machine capable of washing laundry more effectively when using a liquid detergent to wash the laundry.

A washing machine according to the present embodiment includes a water tub, a rotating tub, and liquid detergent course execution means. Water is stored in the water tank. The rotating tub is provided rotatably about a horizontal axis or an inclined axis in the water tank, and contains laundry. The liquid detergent course executing means executes a liquid detergent course of supplying liquid detergent into the water tank to wash the laundry in the rotating tub. Then, the liquid detergent course executing means executes a concentrated washing process for washing the laundry in the rotating tub by supplying water to the set water level for concentrated washing into the water tank. a main washing process for washing the laundry in the rotating tub by supplying water up to a set water level for main washing higher than the set water level for concentrated washing, wherein the concentrated washing process is executed in a plurality of stages. The concentrated washing process has at least a first concentrated washing process and a second concentrated washing process as the plurality of stages, and the first concentrated washing process is more likely to increase the number of the rotating tanks than the main washing process. The rotation speed is high, the second concentrated washing process is performed after the first concentrated washing process, the rotation speed of the rotating tank is lower than that of the main washing process, and the liquid detergent course executing means The period during which the rotating tub is stopped in the second concentrated washing process is made shorter than the period during which the rotating tub is stopped in the main washing process .

FIG. 2 is a longitudinal side view schematically showing a configuration example of the washing machine according to the present embodiment; 1 is a block diagram schematically showing a configuration example of a control system of a washing machine according to the present embodiment; FIG. A diagram exemplifying a change in water level in the powder detergent course and a change in water level in the liquid detergent course The figure which illustrates the operation content of a powder detergent course, and the operation content of a liquid detergent course.

An embodiment of a washing machine will be described below with reference to the drawings. The washing machine 10 illustrated in FIG. 1 is a so-called horizontal-axis drum-type washing machine in which the rotation axis of the rotating tub is a horizontal axis or an inclined axis. , a laundry entrance 12 for loading and unloading laundry. The laundry doorway 12 has a circular opening and is opened and closed by a circular door 13 as well. A bottomed cylindrical water tank 14 capable of storing water is provided inside the housing 11 . The water tank 14 is elastically supported by a pair of suspensions 15 provided on the left and right sides of the bottom of the water tank 14 .

A water tank cover 16 is provided on the front surface of the water tank 14 . A circular opening 17 is provided in the central portion of the water tank cover 16 . A water tank cover 16 having an opening 17 in the center forms an annular front wall in front of the water tank 14 . A jet port 18 is provided on the rear surface of the water tank cover 16 . The injection port portion 18 is formed by attaching a water injection cover 19 to the rear surface of the water tank cover 16 . The water injection cover 19 is fixed to the rear surface of the water tank cover 16 by, for example, welding.

A drum 20 , which is an example of a rotating tank, is rotatably provided inside the water tank 14 . The drum 20 has a bottomed cylindrical shape in which laundry can be accommodated. The rotating shaft of the drum 20 is inclined along the front-rear direction of the washing machine 10, that is, along the depth direction, so that the rear side is lower than the front side. The drum 20 is rotated by a washing machine motor 21 provided on the rear surface of the water tub 14 . A balance ring 22 is provided on the front surface of the drum 20 . A circular opening 23 is provided in the center of the balance ring 22 . A balance ring 22 having a central opening 23 forms a toroidal front wall on the front face of the drum 20 . A plurality of through holes 20a are provided in the side peripheral surface of the drum 20 . Further, the inner peripheral surface of the drum 20 is provided with a plurality of baffles 20b for raking up the laundry.

The washing machine 10 also includes a water supply mechanism section 30 , a drainage mechanism section 31 , and a circulation mechanism section 32 . The water supply mechanism unit 30 includes a water supply valve 30a, a water supply case 30b, etc. on a water supply path extending from the water supply port 11a of the housing 11 to the water supply port 14a of the water tank 14. Water is supplied into the water tank 14 in the rinsing process for rinsing the laundry. The water supply case 30b has a detergent input portion (not shown). Powder detergent, liquid detergent, softener, etc. can be stored in this detergent input section. The powder detergent, liquid detergent, softener, etc. contained in the detergent input portion are supplied into the water tub 14 together with the water flowing through the water supply path.

The drainage mechanism section 31 includes a drainage valve 31a and the like on a drainage path extending out of the machine from the drainage port 14b of the water tank 14, and discharges the water in the water tank 14 to the outside of the machine during the drainage process. The circulation mechanism part 32 includes a circulation pump 32a and the like on a drainage path extending from the drain port part 14b of the water tank 14 to the injection port part 18, and sucks and pumps the water in the water tank 14 during the washing process and the rinsing process. Then, it is sprayed from the injection port 18 into the water tank 14 in a shower-like manner. That is, the circulation mechanism part 32 circulates the water in the water tank 14 and jets it into the water tank 14 in a shower-like manner.

Next, a configuration example of the control system of the washing machine 10 will be described. The control device 50 illustrated in FIG. 2 is mainly composed of a microcomputer, and controls the overall operation of the washing machine 10 according to a control program. The control device 50 controls various drive units such as the water supply valve 30a, the drain valve 31a, and the washing machine motor 21 to perform well-known washing processes for washing the laundry in the drum 20 and rinsing the laundry in the drum 20. Various operation courses including a well-known rinsing process, a well-known dewatering process for dehydrating the laundry in the drum 20, and the like can be executed. Further, the control device 50 can circulate the water in the water tank 14 and jet it into the water tank 14 in a shower-like manner by controlling the drive of the circulation pump 32a in the washing process and the rinsing process.

In washing machine 10 of the present embodiment, controller 50 is configured to be able to execute a powder detergent course and a liquid detergent course. The powder detergent course is an operation course in which powder detergent is supplied into the water tub 14 to wash the laundry in the drum 20 . On the other hand, the liquid detergent course is an operation course in which liquid detergent is supplied into the water tub 14 to wash the laundry in the drum 20 . That is, the control device 50 virtually realizes the powder detergent course execution processing section 61 and the liquid detergent course execution processing section 62 by software by executing the control program. Note that these processing units may be configured by hardware, or may be configured by a combination of software and hardware.

The powder detergent course execution processing unit 61 is an example of a powder detergent course execution means, and executes the powder detergent course described above. The powder detergent course is an operation course in which the laundry is washed in the main washing process without including the concentrated washing process, which will be described later in detail. On the other hand, the liquid detergent course execution processing unit 62 is an example of liquid detergent course execution means, and executes the liquid detergent course described above. The liquid detergent course includes a concentrated washing process, which will be described later in detail, and is an operation course for washing laundry through this concentrated washing process and a main washing process.

The control device 50 can select and execute a powder detergent course and a liquid detergent course, for example, according to a user's selection operation. Note that the washing machine 10 automatically selects the powder detergent course when, for example, the detergent input section does not have an attachment for liquid detergent input, and the detergent input section has an attachment for liquid detergent input. It may be configured to automatically select the liquid detergent course if fitted. Whether or not the liquid detergent attachment is attached is determined by, for example, whether or not a reed switch provided in the detergent input section responds to a magnet provided in the liquid detergent attachment. can be determined based on

The liquid detergent course execution processing unit 62 is configured to be able to execute a concentrated washing process and a main washing process as washing processes in the liquid detergent course. In the concentrated washing process, the liquid detergent course execution processing unit 62 supplies water up to the set water level La for concentrated washing into the water tank 14 and drives the drum 20 to wash the laundry in the drum 20 . On the other hand, in the main washing process, the liquid detergent course execution processing unit 62 supplies water to the set water level Lb for main washing in the water tank 14 and drives the drum 20 to wash the laundry in the drum 20 .

The set water level La for concentrated washing can be changed and set as appropriate, for example, it can be adjusted and set according to the weight of the laundry accommodated in the drum 20 . In this case, as will be described later, the set water level La for concentrated washing can be adjusted in multiple stages of "high" level, "middle" level, "low" level, and "low" level. The weight of laundry contained in drum 20 can be determined, for example, by well-known weight sensing. The weight sensing utilizes the fact that the rotation load of the washing machine motor 21 changes according to the weight of the laundry in the drum 20. For example, before water is supplied to the water tank 14, the washing machine motor 21 is This can be done by rotating the washing machine motor 21 for a predetermined short period of time and detecting a change in the rotational speed of the washing machine motor 21 at that time.

In addition, the set water level Lb for main washing can also be appropriately changed and set to a water level higher than the set water level La for concentrated washing. It can be adjusted and set in a range higher than the set water level La. In this case, the set water level Lb for main washing is also adjustable in a plurality of stages of "high" level, "middle" level, "low" level, and "low" level. In the concentrated washing process, the amount of water in the water tank 14 is smaller than in the main washing process, so the concentration of the liquid detergent in the wash water in the water tank 14 is higher than in the main washing process. Therefore, according to the concentrated washing process, the laundry can be washed with washing water in which the liquid detergent is more concentrated than in the main washing process.

In FIG. 3, the dashed line illustrates the change in the water level in the water tank 14 in the powder detergent course, and the solid line illustrates the change in the water level in the water tank 14 in the liquid detergent course. As illustrated in FIG. 3, in the liquid detergent course, the liquid detergent course execution processing unit 62 first executes the concentrated washing process, and after this concentrated washing process, executes the main washing process. In this case, the liquid detergent course execution processing unit 62 is configured to execute the first concentrated washing process and the second concentrated washing process as the concentrated washing process. In the first concentrated washing process, the liquid detergent course execution processing unit 62 supplies water up to the set water level La1 for first concentrated washing into the water tub 14 to drive the drum 20, thereby washing the laundry in the drum 20. wash. On the other hand, in the second concentrated washing process, the liquid detergent course execution processing unit 62 supplies water up to the set water level La2 for the second concentrated washing into the water tank 14 to drive the drum 20, so that the washing in the drum 20 is performed. wash things

The set water level La1 for the first concentrated washing can be changed and set as appropriate, for example, it can be adjusted and set according to the weight of the laundry accommodated in the drum 20 . In this case, the set water level La1 for the first concentrated washing can be adjusted in a plurality of steps. On the other hand, the second concentrated washing set water level La2 is higher than the first concentrated washing set water level La1 and lower than the main washing set water level Lb. It can be adjusted and set in a range higher than the set water level La1 for first concentrated washing and lower than the set water level Lb for main washing according to the weight of the laundry stored inside. In this case, the set water level La2 for the second concentrated washing is also adjustable in a plurality of steps. The liquid detergent course execution processing unit 62 first executes the first concentrated washing process, and after this first concentrated washing process, executes the second concentrated washing process.

As illustrated in FIG. 4, in the first concentrated washing process in the liquid detergent course, the liquid detergent course execution processing unit 62 moves the drum 20 inside the drum 20 regardless of the level of the set water level La1 for the first concentrated washing. Rotate at a rotational speed such that the laundry sticks to the peripheral surface, for example, at a rotational speed of 150 rpm. Further, the liquid detergent course execution processing unit 62 continuously drives the drum 20 regardless of the level of the set water level La1 for first concentrated washing. Continuous rotation of the drum 20 with the laundry sticking to the inner peripheral surface causes a centrifugal force, which makes it easier for the washing water containing the liquid detergent to permeate the laundry. That is, this first concentrated washing step can be called a liquid detergent permeation step for permeating the laundry with the liquid detergent.

Further, in the first concentrated washing process, the liquid detergent course execution processing section 62 drives the pump motor of the circulation pump 32a at a predetermined rotational speed. In this case, the liquid detergent course execution processing unit 62 drives the pump motor of the circulation pump 32a at a rotational speed of 2600 rpm when the first concentrated washing set water level La1 is at the "high" level. Further, the liquid detergent course execution processing unit 62 rotates the pump motor of the circulation pump 32a at 3350 rpm when the first concentrated washing set water level La1 is at the "middle" level, the "low" level, or the "low" level. Drive at speed.

In the first concentrated washing process, the liquid detergent course execution processing unit 62 turns on the circulation pump 32a for 8 seconds when the set water level La1 for the first concentrated washing is at the "high" level or the "medium" level. It is intermittently driven by repeating turning off for 7 seconds. Further, the liquid detergent course execution processing unit 62 turns on the circulation pump 32a for 5 seconds and turns it off for 10 seconds when the set water level La1 for the first concentrated washing is at the "low" level or the "low" level. It is intermittently driven by repeating. That is, when the first concentrated washing set water level La1 is low, the liquid detergent course execution processing unit 62 shortens the period during which the circulation pump 32a is driven compared to when the first concentrated washing set water level La1 is high. Also, the period during which the circulation pump 32a is stopped is lengthened.

Further, in the second concentrated washing step in the liquid detergent course, the liquid detergent course execution processing unit 62 rotates the drum 20 at a rotation speed at which the laundry rolls in the lower part of the drum 20, for example, at a rotation speed of 30 rpm. As the drum 20 rotates at such a rotational speed that the laundry rolls in the lower portion of the drum 20 , the laundry pieces rub against each other in the lower portion of the drum 20 . That is, the second concentrated washing process is not a "beating wash" in which the laundry in the drum 20 is washed by raking it up with the baffle 20b, but a "rubbing wash" in which the laundry in the drum 20 is rubbed against each other. and can be referred to as a scrubbing process.

Further, in the second concentrated washing process, the liquid detergent course execution processing section 62 changes the rotation mode of the drum 20 based on the level of the set water level La for the second concentrated washing. In this case, the liquid detergent course execution processing unit 62 turns on the rotation of the drum 20 for 10 seconds and turns it off for 2 seconds when the set water level La2 for the second concentrated washing is at the "high" level or the "medium" level. It is driven intermittently by repeating this. Further, the liquid detergent course execution processing unit 62 continuously drives the drum 20 when the second concentrated washing set water level La2 is at the "low" level or the "low" level.

Also, in the second concentrated washing step, the liquid detergent course execution processing section 62 drives the pump motor of the circulation pump 32a at a predetermined rotational speed. In this case, the liquid detergent course execution processing unit 62 drives the pump motor of the circulation pump 32a at a rotational speed of 2600 rpm when the second concentrated washing set water level La2 is at the "high" level, and the liquid detergent course execution processing unit 62 drives the pump motor at the "medium" level. , "low" level, and "low" level, the pump motor of the circulation pump 32a is driven at a rotational speed of 3350 rpm.

Further, in the second concentrated washing step, the liquid detergent course execution processing unit 62 turns on the circulation pump 32a for 12 seconds and turns off for 8 seconds when the set water level La2 for the second concentrated washing is at the "high" level. It is intermittently driven by repeating the above. Further, the liquid detergent course execution processing unit 62 turns on the circulation pump 32a for 8 seconds to It is intermittently driven by repeating turning off for a second. That is, when the second concentrated washing set water level La2 is low, the liquid detergent course execution processing unit 62 shortens the period during which the circulation pump 32a is driven compared to when the second concentrated washing set water level La2 is high. Also, the period during which the circulation pump 32a is stopped is lengthened.

Further, in the main washing process in the liquid detergent course, the liquid detergent course execution processing unit 62 rotates the drum 20 at a rotation speed that allows the laundry to be swept up inside the drum 20, for example, at a rotation speed of 42 rpm. By scooping up and dropping the laundry in the drum 20, the laundry can be washed by so-called "beating washing". That is, this main washing process can be called a well-known beating washing process.

In the main washing process, the liquid detergent course execution processing unit 62 intermittently drives the drum 20 regardless of the level of the set water level Lb for main washing. In this case, the liquid detergent course execution processing unit 62 intermittently drives the drum 20 by repeatedly turning it on for 20 seconds and turning it off for 5 seconds, regardless of whether the set water level Lb for main washing is high or low.

Further, in this main washing process, the liquid detergent course execution processing unit 62 drives the pump motor of the circulation pump 32a at a predetermined rotational speed. In this case, the liquid detergent course execution processing unit 62 continuously drives the circulation pump 32a regardless of whether the set water level Lb for main washing is high or low. The operation contents of the main washing process in the liquid detergent course are the same as the operation contents of the main washing process in the powder detergent course.

In the liquid detergent course described above, the liquid detergent course execution processing unit 62 changes the rotational speed of the drum 20 in the concentrated washing process, in this case, the second concentrated washing process in which the "rubbing" is performed, to "beating". It is set lower than the rotational speed of the drum 20 in the main washing process.

Further, in this liquid detergent course, the liquid detergent course execution processing unit 62 performs "beating washing" during the period during which the drum 20 is stopped in the concentrated washing process, in this case, the second concentrated washing process in which "scrubbing" is performed. It is set shorter than the period during which the drum 20 is stopped in the main washing process.

Further, in this liquid detergent course, the liquid detergent course execution processing unit 62 sets the period during which the circulation pump 32a is stopped in the concentrated washing process, in this case, the second concentrated washing process in which the "scrubbing" is performed, to "beating washing". It is set longer than the period during which the circulation pump 32a is stopped in the main washing process to be performed.

According to the washing machine 10 according to the present embodiment, the liquid detergent course execution processing unit 62 first executes the concentrated washing process in the washing process of the liquid detergent course. In this concentrated washing process, water is supplied to the water tank 14 up to the set water level La for concentrated washing, and the laundry in the drum 20 is washed. After the concentrated washing process, the liquid detergent course execution processing unit 62 executes the main washing process. In this main washing step, water is supplied into the water tank 14 to a set water level Lb for main washing which is higher than the set water level La for concentrated washing, and the laundry in the drum 20 is washed.

Here, the liquid detergent is less likely to remain undissolved than the powder detergent, and can be sufficiently dissolved even in a small amount of water. Therefore, it is possible to generate washing water in which the liquid detergent is dissolved at a high concentration. According to the washing machine 10 according to the present embodiment, the characteristic of the liquid detergent that it can generate high-concentration washing water is effectively utilized, and high-concentration liquid detergent is applied before washing the laundry in the main washing process. The laundry was washed with the washing water containing Therefore, when washing the laundry using the liquid detergent, the laundry can be washed more effectively.

Further, according to the washing machine 10, the first concentrated washing process and the second concentrated washing process are provided as the concentrated washing process. Then, in the first concentrated washing process, the drum 20 is rotated at a rotation speed at which the laundry sticks to the inner peripheral surface of the drum 20, and the washing water containing the liquid detergent at a high concentration is efficiently permeated into the laundry. . Further, in the second concentrated washing process, the drum 20 is rotated at a rotational speed at which the laundry rolls in the lower part of the drum 20, and the laundry permeated with the washing water containing the liquid detergent at a high concentration is rubbed against each other. Wash as follows. As a result, the laundry can be washed more effectively by making effective use of the characteristic of the liquid detergent that highly concentrated washing water can be generated.

The washing machine 10 according to the present embodiment is a drum-type washing machine in which the rotation axis of the rotating tub is a horizontal axis or an inclined axis. Compared to a shaft-type washing machine, the laundry is less likely to rub against each other, and therefore the mechanical force due to the friction applied to the laundry tends to be insufficient, resulting in the problem that stains are difficult to remove. In addition, since liquid detergents do not contain chelating agents or zeolites, compared to powdered detergents containing these agents, liquid detergents may have inferior cleaning performance depending on the type of dirt. Therefore, in particular, when washing laundry using a liquid detergent in a drum-type washing machine, the mechanical power and washing performance may be insufficient, and it is necessary to solve these two problems at the same time. occurs. According to the washing machine 10 according to the present embodiment, in the second concentrated washing process, the amount of water in the water tank 12 is reduced and "scrubbing" is performed, so that the liquid detergent is concentrated to a high concentration and used for washing. Create a situation where things tend to rub against each other. Therefore, by overcoming the disadvantages of drum-type washing machines in that the mechanical force applied to the laundry is insufficient, and the disadvantages of liquid detergents in that their cleaning performance is inferior to that of powdered detergents, it is possible to "scrub" the laundry more effectively. can be washed properly.

Further, according to the washing machine 10, the rotational speed of the drum 20 in the second concentrated washing process for "rubbing" is set lower than the rotational speed of the drum 20 in the main washing process for "beating". In the second concentrated washing process, the laundry is washed with the washing water in which the liquid detergent is concentrated to a high concentration. Therefore, if the drum 20 is rotated at the same rotational speed as in the main washing process, bubbles are likely to be generated. . Since the generated foam has a cushioning property, there is a possibility that the cleaning effect of washing the laundry may be reduced by rubbing the laundry together. According to the washing machine 10, the rotational speed of the drum 20 in the second concentrated washing process for "scrubbing" is set lower than the rotational speed of the drum 20 in the main washing process for "beating washing", so bubbles are generated. can be suppressed, and reduction in the cleaning effect due to scrubbing can be avoided.

Further, according to the washing machine 10, the period during which the drum 20 is stopped in the second concentrated washing process for "scrubbing" is made shorter than the period for stopping the drum 20 in the main washing process for "beating washing". According to this configuration, it is possible to reduce the period during which the drum 20 is not rotating in the second concentrated washing process, that is, the period during which the laundry is not rubbed against each other. Therefore, it is possible to further suppress the reduction in the cleaning effect due to scrubbing.

In addition, according to the washing machine 10, the period during which the circulation pump 32a is stopped in the second concentrated washing process for "scrubbing" is longer than the period during which the circulation pump 32a is stopped in the main washing process for "beating washing". do. As described above, in the second concentrated washing process, bubbles are likely to be generated from the washing water containing the liquid detergent at a high concentration. are more likely to occur. According to the washing machine 10, the period during which the circulation pump 32a is stopped in the second concentrated washing process for "rubbing" is made longer than the period during which the circulation pump 32a is stopped in the main washing process for "beating washing". , the period during which the circulating water is sprayed into the water tub 14 in a shower-like manner can be shortened, and therefore the generation of bubbles having cushioning properties can be suppressed. Therefore, it is possible to avoid reduction in cleaning effect due to scrubbing.

This embodiment is not limited to the one embodiment described above, and can be modified or expanded as follows, for example.
In the above-described embodiment, the liquid detergent course execution processing unit 62 sets the rotation speed of the drum 20 to the rotation speed at which the laundry sticks to the inner peripheral surface of the drum 20, which is the first stage of the concentrated washing process. 1 concentrated washing process. The present embodiment is not limited to this, and the liquid detergent course execution processing unit 62 sets the rotation speed of the drum 20 to the rotation speed at which the laundry sticks to the inner peripheral surface of the drum 20 as the concentrated washing process. is completed, in other words, before the main washing process is started. That is, the period during which the rotation speed of the drum 20 is the rotation speed at which the laundry sticks to the inner peripheral surface of the drum 20, that is, the period in which the laundry is permeated with the washing water containing the liquid detergent at a high concentration is the main washing process. can be adjusted and set as appropriate before the start of

The concentrated washing process is not limited to two stages consisting of a first concentrated washing process and a second concentrated washing process, and may be one stage or a plurality of stages of three or more stages. In this case, in a plurality of stages, it is preferable to configure the water level to be different. Further, it is preferable to set the water level to be higher in the latter concentrated washing process within a range lower than the set water level Lb for main washing. Thereby, it is possible to smoothly shift from the concentrated washing process to the main washing process.

Further, the concentrated washing step of permeating the laundry with the washing water may be composed of two or more steps. Also in this case, it is preferable to set the water level to be higher in the latter concentrated washing process within a range lower than the set water level Lb for main washing. Also, the concentrated washing step of performing so-called "scrubbing" may be composed of two or more stages. Also in this case, it is preferable to set the water level to be higher in the latter concentrated washing process within a range lower than the set water level Lb for main washing.

Some liquid detergents can be sufficiently removed from the laundry in a single rinsing cycle, while others cannot be sufficiently removed from the laundry without multiple rinsing cycles (2 or more). Therefore, the washing machine 10 is preferably configured so that the number of times the rinsing process is performed can be adjusted according to the type and characteristics of the liquid detergent to be used. The number of times the rinsing process is performed can be adjusted, for example, by providing an operation key for adjusting the number of times of rinsing on an operation panel (not shown) and adjusting according to the operation of this operation key. Furthermore, when the number of times the rinsing process is performed is changed, the washing machine 10 stores the changed number of times of rinsing, and automatically reflects the changed number of times of rinsing in the next operation. Good to configure. According to this configuration, the user does not need to adjust the number of times of rinsing each time the liquid detergent course is performed, and the user-friendly washing machine 10 can be provided.

According to the washing machine according to the present embodiment described above, when the liquid detergent course execution means starts the liquid detergent course, first, water is supplied to the water tank up to the set water level for concentrated washing, and the washing is performed in the rotating tank. Carry out a concentrated washing process to wash things. After the concentrated washing process, the liquid detergent course executing means performs a main washing process for washing the laundry in the rotary tub by supplying water to the set water level for main washing higher than the set water level for concentrated washing into the water tank. Run. According to this configuration, by effectively utilizing the characteristics of the liquid detergent that it is possible to generate high-concentration washing water, the laundry is washed with the washing water containing the high-concentration liquid detergent before the main washing in the main washing process. The laundry can be washed, and the laundry can be washed more effectively when the laundry is washed using a liquid detergent.

It should be noted that this embodiment is presented as an example and is not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and modifications 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 scope of the invention described in the claims and its equivalents.

In the drawing, 10 is a washing machine, 14 is a water tank, 20 is a drum (rotating tub), 32a is a circulation pump, and 62 is a liquid detergent course execution processing section (liquid detergent course execution means).

Claims (4)

a water tank in which water is stored;
a rotating tub that is rotatable about a horizontal axis or an inclined axis in the tub and that accommodates the laundry;
a liquid detergent course execution means for supplying a liquid detergent into the water tank and executing a liquid detergent course for washing the laundry in the rotating tub;
The liquid detergent course execution means includes:
A concentrated washing step is performed to wash the laundry in the rotating tub by supplying water to the set water level for concentrated washing into the water tank, and after the concentrated washing step, the water level in the water tank is lower than the set water level for concentrated washing. A main washing step of supplying water up to a high set water level for main washing to wash the laundry in the rotating tub, wherein the concentrated washing step is performed in a plurality of stages,
The concentrated washing step has at least a first concentrated washing step and a second concentrated washing step as the plurality of steps,
In the first concentrated washing process, the rotation speed of the rotating tank is higher than in the main washing process,
The second concentrated washing process is executed after the first concentrated washing process, the rotating speed of the rotating tank is lower than that of the main washing process,
The washing machine , wherein the liquid detergent course execution means shortens the period during which the rotating tub is stopped in the second concentrated washing process as compared to the period during which the rotating tub is stopped in the main washing process . 2. The washing machine according to claim 1, wherein said liquid detergent course executing means controls the rotational speed of said rotating tub to a rotating speed at which the laundry rolls in the lower portion of said rotating tub in said second concentrated washing step . 2. The liquid detergent course executing means provides a period of time during which the rotation speed of the rotation tub is set to a rotation speed at which the laundry sticks to the inner peripheral surface of the rotation tub until the first concentrated washing step is completed. Or the washing machine according to 2 . Further comprising a circulation pump for circulating water in the water tank,
4. The liquid detergent course execution means according to any one of claims 1 to 3 , wherein the period during which the circulation pump is stopped during the second concentrated washing process is longer than the period during which the circulation pump is stopped during the main washing process. washing machine described in .

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