CN116732752A - washing machine - Google Patents

Abstract

The washing machine comprises a valve unit for controlling water supply from a tap water pipe; a water level detection unit for detecting the water level of the water stored in the washing tank; and a water supply control part for performing water supply treatment for accumulating water in the washing tank until the water level is a first water level, wherein the valve unit is provided with a first water supply port; a second water supply port having a smaller discharge amount per unit time than the first water supply port; a first water supply valve for opening and closing the first water supply port; and a second water supply valve that opens and closes the second water supply port, wherein the water supply control unit is configured to start supplying the detergent in the water supply process, to open the first water supply valve before the water level reaches a second water level lower than the first water level, and to open the second water supply valve until the supply amount of the detergent reaches the predetermined amount when the supply amount of the detergent is smaller than the predetermined amount at the time when the water level reaches the second water level.

Description

Washing machine

Technical Field

The present invention relates to a washing machine.

Background

Conventionally, a liquid detergent dispensing device for a washing machine for supplying a liquid detergent to a washing machine has been disclosed (for example, refer to japanese patent application laid-open No. 8-229293).

In this liquid detergent dispensing device for a washing machine, the liquid detergent is stored in a container and supplied to the fully automatic washing machine through a pipe connected to the container.

Disclosure of Invention

In the washing machine, it is preferable that the water supply time is short in order to secure the time taken for the washing process.

However, since the water supply time is too short, in the case where the supply of the detergent is not completed during the water supply time, there is a possibility that the laundry is directly attached to the detergent and discolored.

The present disclosure provides a washing machine capable of simultaneously shortening water supply time and suppressing discoloration of laundry caused by detergent.

The washing machine according to one aspect of the present invention includes: a valve unit controlling water supply from the tap water pipe; a water level detection unit for detecting the water level of the water stored in the washing tank; and a water supply control unit for controlling the valve unit based on the detection result of the water level detection unit, and performing water supply treatment for accumulating water in the washing tank until the water level reaches a first water level, wherein the valve unit includes a first water supply port for discharging water from the tap water pipe; a second water supply port that discharges water from the water pipe, the discharge amount per unit time being smaller than the first water supply port; a first water supply valve for opening and closing the first water supply port; and a second water supply valve for opening and closing the second water supply port; the water supply control section controls in the water supply process: starting before starting to supply the detergent, opening the first water supply valve before the water level reaches a second water level lower than the first water level, and opening the second water supply valve until the supply amount of the detergent reaches the prescribed amount when the supply amount of the detergent is less than the prescribed amount at the time when the water level reaches the second water level.

Drawings

Fig. 1 is a partially cut-away perspective view of a washing machine according to an embodiment.

Fig. 2 is a block diagram of a valve unit and a water supply control unit for controlling the valve unit, which are provided in the washing machine.

Fig. 3 is a time chart of water supply processing based on the water supply control unit.

Fig. 4 is a time chart of water supply processing based on the first modification of the water supply control unit described above.

Fig. 5 is a timing chart of water supply processing based on the second modification of the water supply control unit described above.

Fig. 6 is a time chart of water supply processing based on the third modification of the water supply control unit described above.

Detailed Description

The embodiments and modifications described below are merely examples of the present invention, and the present disclosure is not limited to the embodiments and modifications. In addition to the embodiment and the modification, various modifications may be made according to the design or the like without departing from the scope of the technical idea of the present invention.

(embodiment)

Hereinafter, a washing machine 1 according to the present embodiment will be described with reference to fig. 1 to 3. The following description will be made with reference to the directions of the front and rear sides, the up and down sides, the left and right sides, and the up and down sides, respectively, shown in fig. 1. However, these directions are directions set for convenience of explanation, and are not directions in use.

Fig. 1 is a perspective view of a washing machine 1. In fig. 1, a longitudinal section of the washing machine 1 is shown with the front right portion removed in order to illustrate the internal structure of the washing machine 1.

The washing machine 1 of the present embodiment is a so-called vertical washing machine, and includes a washing tub 112 having an open upper surface. The washing machine 1 is a shoe washing machine that envisages shoes as articles to be washed. The object to be washed is not limited to shoes, and may be a three-dimensional tangible object.

As shown in fig. 1, the washing machine 1 includes an outer case 110, an upper member 120, an upper cover 130, a base member 140, a driving mechanism 150, and the like. The outer case 110 has a square tubular shape with upper and lower openings. An upper member 120 is provided on the upper side of the outer case 110, and a base member 140 is provided on the lower side of the outer case 110. The upper cover 130 can open and close an opening portion that penetrates the upper member 120 in the up-down direction. The water tank 111 is disposed in the outer case 110 and has a substantially cylindrical shape with a bottom that is open upward. A drain portion for draining water in the water tank 111 is provided at the bottom of the water tank 111.

A washing tub 112 into which shoes, which are objects to be washed, are put is provided in the tub 111. The washing tub 112 is also substantially cylindrical with a bottom, which is open upward, like the water tub 111, and the washing tub 12 is rotatable relative to the water tub 111. An axis O passing through the rotation center of the washing tub 112 extends in the up-down direction. A water outlet is formed at the bottom of the washing tub 112, and a plurality of drain holes are formed at the peripheral wall or upper end of the washing tub 112. Shoes are moved into and out of the washing tub 112 from above through an upper end opening of the washing tub 112. A balance ring 114 is provided along an upper end opening edge of the washing tub 112.

The washing machine 1 includes a rotating body 113 disposed at the bottom of the washing tub 112 and rotating about an axis extending in the up-down direction. For example, the rotary body 113 is a disk-shaped pulsator for stirring water in the washing tub 112. The rotating body 113 is rotatable with respect to the washing tub 112. An axis passing through the rotation center of the rotation body 113 substantially coincides with the axis O of the washing tub 112. A driving mechanism 150 for rotatably driving the washing tub 112 and the rotary body 113 is provided below the washing tub 112. A clutch 151 is provided between the drive mechanism 150 and the washing tub 112 and the rotating body 113. The state in which the power of the driving mechanism 150 is transmitted to the washing tub 112 and the rotating body 113 and the state in which the power of the driving mechanism 150 is transmitted only to the rotating body 113 are switched by the clutch 151.

As shown in fig. 1, the washing machine 1 includes a brush 103. The brush holder 103 includes a shaft 160 fixed to the upper side of the rotating body 113 and a brush unit 107 extending from the shaft 160 toward the inner peripheral surface 112A of the washing tub 112, and rotates together with the rotating body 113. The brush unit 107 is disposed so as to straddle from the upper end portion to the lower end portion of the shaft portion 160. The axis passing through the rotation center of the brush holder 103 passes through the center of the shaft 160, and is substantially coincident with the axis O of the washing tub 112. Therefore, the washing tub 112, the rotating body 113, and the brush holder 103 can all rotate around the axis O. The rotation direction about the axis O substantially coincides with the circumferential direction of the washing tub 112.

The washing machine 1 of the present embodiment includes a coin handling apparatus 100 provided on the upper surface of the upper member 120, and is provided in, for example, a coin sorter. When a predetermined amount of coins are inserted into the coin handling apparatus 100, the washing machine 1 washes shoes using water and a liquid detergent supplied from the outside.

The washing machine 1 includes a water supply unit 2 for mixing water supplied from the outside with a detergent and putting the mixture into a washing tub 112.

The water supply unit 2 is disposed inside the upper member 120. The water supply unit 2 is connected to a water supply hose 301 for supplying water and a detergent hose 401 for supplying detergent.

As shown in fig. 2, the water supply unit 2 has a valve unit 3 and a throw-in tank 4.

The input tank 4 is supplied with water from a tap water pipe via the valve unit 3. In addition, the detergent is supplied from the detergent tank 400 to the input box 4 via the detergent pump 61. The input box 4 mixes the supplied water and the detergent into the washing tank 112.

The valve unit 3 is connected to the tap 300 via a water supply hose 301. The valve unit 3 controls the supply of water from the mains. The valve unit 3 has a water supply hose connection portion 31, a first water supply port 32, a second water supply port 33, a first water supply valve 34, and a second water supply valve 35.

As shown in fig. 1, the water supply hose connection portion 31 is exposed upward from the upper member 120 of the washing machine 1, and is connected to the water supply hose 301. An end of the water supply hose 301 opposite to the water supply hose connection part 31 is connected to the tap 300. The water supply hose connection part 31 supplies water from a tap water pipe via a water supply hose 301. The water supplied to the water supply hose connection part 31 is discharged from the first water supply port 32 and the second water supply port 33. The water discharged from the first water supply port 32 and the second water supply port 33 is introduced into the washing tank 112 via the introduction tank 4.

The discharge amount per unit time of the first water supply port 32 and the second water supply port 33 is different. The second water supply port 33 is smaller in discharge amount per unit time than the first water supply port 32. For example, the discharge amount per unit time of the first water supply port 32 is 19[ liter/minute ], and the discharge amount per unit time of the second water supply port 33 is 4[ liter/minute ]. Further, this value is an example, and the discharge amount per unit time varies depending on, for example, the water pressure of tap water. In particular, the discharge amount per unit time of the first water supply port 32 is larger than that of the second water supply port 33, and is easily affected by the water pressure.

The first water supply valve is, for example, a solenoid valve, and is configured to open and close the first water supply port 32. The second water supply valve is, for example, a solenoid valve, and is configured to open and close the second water supply port 33. The first water supply valve and the second water supply valve are opened and closed by a water supply control unit 51. The water supply control unit 51 will be described later.

The input box 4 is provided with a detergent hose connection portion 40. The detergent hose connection part 40 is connected to the detergent hose 401. The detergent hose 401 is connected to the detergent tank 400 via the detergent pump 61. The detergent tank 400 is provided at an outer side of the washing machine to accommodate detergent. The detergent pump 61 is provided in the coin processing apparatus 100 (see fig. 1), and is configured to supply the detergent in the detergent tank 400 to the input box 4 by operation. The detergent pump 61 is controlled by the detergent control section 52. The detergent control unit 52 will be described later.

The detergent hose 401 is provided with a detergent sensor 62. The detergent sensor 62 is provided in the coin processing apparatus 100, and detects a supply amount of the detergent (hereinafter referred to as a detergent supply amount) by the detergent pump 61. The detergent sensor 62 is, for example, an optical sensor including a light emitting element and a light receiving element. The detergent hose 401 has light transmittance. The detergent sensor 62 is provided so as to sandwich the detergent hose 401 with the light emitting element and the light receiving element. The light receiving state of the light emitted from the detergent light emitting element changes according to the presence or absence of the detergent hose 401. In the present embodiment, when the detergent passes through the detergent hose 401, the light receiving element receives the light emitted from the light emitting element. The detergent sensor 62 detects the accumulation of light receiving time of light receiving element receiving light as the detergent supply amount.

Further, a processing device 5 is provided inside the upper member 120. The treatment device 5 has a water supply control unit 51 and a detergent control unit 52. The processing device 5 is constituted by, for example, a microcomputer having a processor and a memory. That is, the processing means 5 is implemented by a computer system having a processor and a memory. The water supply control unit 51 and the detergent control unit 52 function by executing an appropriate program by the processor. The program may be recorded in advance in the memory, or may be provided by an electric communication line such as the internet, or recorded in a non-transitory recording medium such as a memory card. The processor of the computer system is composed of 1 to a plurality of electronic circuits including a semiconductor Integrated Circuit (IC) or a large scale integrated circuit (LSI). The plurality of electronic circuits may be integrated into one chip or may be provided in a distributed manner in a plurality of chips. The plurality of chips may be integrated into one device or may be provided in a distributed manner in a plurality of devices. For example, the water supply control part 51 and the detergent control part 52 may be implemented by a plurality of microcomputers.

The water supply control unit 51 performs water supply processing when a predetermined amount of coins are inserted into the coin processing apparatus 100. The water supply process is a process of storing water in the washing tub 112 to a first water level by controlling the opening and closing of the first water supply valve and the second water supply valve. The first water level is a water level required for performing the washing process, and is, for example, a water level at which 24 liters of water is stored in the washing tank. The washing machine further includes a water level detection unit 63 for detecting the water level of the water stored in the washing tub 112. The water level detection unit 63 has a pipe into which water is supplied according to the water level of the washing tank 112, and detects the air pressure in the pipe as the water level of the washing tank 112. The water supply control unit 51 performs water supply processing using the detection result of the water level detection unit 63.

When a predetermined amount of coins are inserted into the coin processing apparatus 100, the detergent control unit 52 executes a detergent supply process. The detergent supply process is a process of operating the detergent pump 61 and supplying a predetermined amount of detergent. The detergent control unit 52 executes a detergent supply process using the detection result of the detergent sensor 62. In addition, the detergent control unit 52 starts the water supply process after the water supply control unit 51 starts the water supply process.

Hereinafter, the water supply process and the detergent supply process will be described in detail with reference to the operation example shown in fig. 3.

When a user inputs coins of a predetermined amount into the coin processing apparatus 100 and performs a predetermined operation on the washing machine, the water supply control unit 51 starts the water supply process.

First, at time t0, the water supply control unit 51 opens both the first water supply valve 34 and the second water supply valve 35. Thereby, water is discharged from the first water supply port 32 and the second water supply port 33. The water discharged from the first water supply port 32 and the second water supply port 33 is introduced into the washing tank 112 via the introduction tank 4. Therefore, water is accumulated in the washing tank 112.

At time t1, the water level of the washing tub 112 reaches the water detection level. The water detection level is a level lower than the first level, for example, a level in a case where 5 liters of water is stored in the washing tank 112. When the water level reaches the water detection level, the water supply control unit 51 and the detergent control unit 52 determine that water is normally supplied to the washing tub 112.

The water supply control part 51 closes the first water supply valve 34 when the water level reaches the water detection level. Therefore, after time t1, only the water supply from the second water supply port 33 is continued.

The detergent control unit 52 starts the detergent supply process and starts the operation of the detergent pump 61 at time t1 when the water level reaches the water detection level. Thereby, the detergent is supplied from the detergent tank 400 to the input box 4. As described above, the water supply is started from before the start of the detergent supply process, and the water supply is continued also after the start of the detergent supply process. Therefore, since the detergent is supplied in the state where the water flows in the input tank 4, the water and the detergent are mixed and supplied to the washing tub 112. This can suppress discoloration of the laundry caused by adhesion of only the detergent to the laundry.

Further, according to the start of the detergent supply process, accumulation of the light receiving time of the detergent sensor 62 starts. Further, immediately after the start of the detergent pump 61, the detergent detection may become unstable due to the foam in the detergent hose 401. Therefore, a predetermined time (for example, about 5 seconds) from the start of the detergent supply process may be excluded from accumulation of the light receiving time as the masking time.

The water supply control unit 51 closes the first water supply valve 34 and opens only the second water supply valve 35 until a predetermined first period T1 elapses from a time T1 when the water level reaches the water detection level. The first period T1 is, for example, 30 seconds. At time T2 when the first period T1 elapses from time T1, the water supply control unit 51 opens the first water supply valve 34 and closes the second water supply valve 35. Therefore, at time t2, the water supply from the second water supply port 33 is switched to the water supply from the first water supply port 32.

The water supply control part 51 opens the first water supply valve 34 until the water level reaches the second water level. The second water level is a water level higher than the water detection water level, lower than the first water level, and about 90% of the first water level. The second water level is, for example, a water level in the case where 22 liters of water is stored in the washing tank 112. When water is stored in the washing tank 112 to the second water level, the water is immersed in the middle portion of the brush unit 107 (see fig. 1) in the up-down direction. That is, the second water level is a position of the center portion of the brush unit 107 in the up-down direction.

In the washing machine of the present embodiment, the low-speed rotation of the rotary body 113 is started before the water level reaches the second water level. For example, when the water level is 8 liters of water stored in the washing tub 112, the low-speed rotation of the rotary body 113 is started. Thus, water and detergent can be mixed in the washing tank 112 to be suitable for the laundry.

At time t3 when the water level reaches the second water level, the water supply control part 51 stops the water supply from the first water supply port 32 by closing the first water supply valve 34. As described above, the discharge amount per unit time of the first water supply port 32 varies depending on, for example, the water pressure of tap water. Therefore, the second period T2 from the time T2 to the time T3 is determined by the discharge amount per unit time of the first water supply port 32. In this operation example, the second period T2 is 47 seconds.

Here, in this operation example, the detergent supply amount is smaller than the predetermined amount at time t3 when the water level reaches the second water level. The supply speed of the detergent is determined by the capacity of the detergent pump 61 and the like. In the present embodiment, when the detergent is normally supplied from the detergent pump 61, it takes about 1 minute and 40 seconds for the detergent supply amount to reach the predetermined amount. In this operation example, the period from the time T1 when the detergent supply process is started to the time T3 when the water level reaches the second water level (the first period t1+the second period T2) is 1 minute and 17 seconds. Therefore, at time t3, the detergent supply amount does not reach the predetermined amount. Further, if foam or the like exists in the detergent hose 401, there is a case where the time until the detergent supply amount reaches the prescribed amount is longer than the normal time.

When the detergent supply amount does not reach the predetermined amount at time t3 when the water level reaches the second water level, the water supply control unit 51 opens the second water supply valve 35 at least until the detergent supply amount reaches the predetermined amount, and supplies water from the second water supply port 33. In this way, since water is continuously supplied during the detergent supply process, discoloration or the like of the laundry due to adhesion of only the detergent to the laundry can be suppressed.

At time t4 when the detergent supply amount reaches the predetermined amount, the detergent control unit 52 ends the detergent supply process. That is, at time t4, the detergent pump 61 is stopped. In addition, at time t4, the water supply control unit 51 stops the water supply from the second water supply port 33 by closing the second water supply valve 35. Therefore, at time t4, both the first water supply valve 34 and the second water supply valve 35 are closed, and the water supply to the washing tub 112 is stopped.

Then, at time T5 when a predetermined third period T3 has elapsed from time T3 when the water level reaches the second water level, the water supply control unit 51 opens the first water supply valve 34, and starts water supply from the first water supply port 32. The third period T3 is a standby time for waiting for completion of the detergent supply process, and is, for example, 30 seconds.

The water supply control part 51 opens the first water supply valve 34 until the water level reaches the first water level. The water supply control unit 51 stops the water supply from the first water supply port 32 by closing the first water supply valve 34 at time t6 when the water level reaches the first water level. Thus, the water supply process is completed, and the washing process for washing the laundry by rotating the rotating body 113 is started. After the water level reaches the first water level, the water supply control unit 51 may open the first water supply valve 34 for a short period of time to supply a small amount of water from the first water supply port 32. This can prevent detergent from remaining in the input box 4.

Further, for example, when the water pressure of the tap water is low, the period from time t1 when the water level reaches the water detection level and the detergent supply process starts to time t3 when the water level reaches the second water level becomes long, and thus the detergent supply process may be completed during this period. In this case, since the detergent supply amount reaches the predetermined amount at time t3, the water supply control unit 51 keeps the second water supply valve 35 closed, and does not supply water from the second water supply port 33. Further, the water supply control part 51 starts to open the first water supply valve 34 until the water level reaches the first water level from time T5 when the third period T3 elapses from time T3.

As described above, in the washing machine of the present embodiment, at the time (time t 3) when the water level in the washing tub 112 reaches the second water level lower than the first water level required in the washing step, it is determined whether the detergent supply amount reaches the predetermined amount. When the detergent supply amount does not reach the predetermined amount, water is supplied from the second water supply port 33 until the detergent supply amount reaches the predetermined amount. The second water supply port 33 has a smaller discharge amount per unit time than the first water supply port 32, and thus the water level gradually rises. Therefore, the detergent supply amount reaches the predetermined amount before the water level reaches the first water level and the water supply is stopped, and the detergent supply process can be completed. This can suppress discoloration of the laundry caused by adhesion of only the detergent to the laundry.

The water supply process includes a period (second period T2) in which the first water supply valve 34 is opened and water is supplied from the first water supply port 32 until the water level reaches the second water level. The first water supply port 32 discharges more per unit time than the second water supply port 33. Therefore, compared with the case where water is accumulated at the second water level by only the water supply from the second water supply port 33, the time can be shortened. This also shortens the water supply time for accumulating water to the first water level, and thus ensures a longer time for the cleaning process.

That is, in the present embodiment, the water supply speed is increased by the water supply from the first water supply port 32 before the water level of the washing tub 112 reaches the second water level slightly lower than the first water level required for the washing process, and the time until the second water level is reached is shortened. Then, when the water level reaches the second water level, if the detergent supply process is not completed, the water supply from the second water supply port 33 is switched to the water supply to suppress the water supply speed, thereby securing the time for the detergent supply process to be completed. This makes it possible to reduce both the water supply time until the water level in the washing tank 112 reaches the first water level and to suppress discoloration of the laundry caused by adhesion of only the detergent to the laundry.

In the present embodiment, only one of the first water supply valve 34 and the second water supply valve 35 is opened during the water supply adjustment period T10 (the first period t1+the second period T2) from the time T1 when the water level reaches the water detection level and the start of the detergent supply process to the time T3 when the water level reaches the second level. Specifically, in the water supply adjustment period T10, the first water supply valve 34 and the second water supply valve 35 are sequentially opened one by one. This can suppress the water supply adjustment period T10 from becoming too short, and the time for the detergent supply process can be ensured to a certain extent in the water supply adjustment period T10. Therefore, the period from the time T3 when the water level reaches the second water level to the time T4 when the detergent supply process is completed can be shortened, and the period can be accommodated in the third period T3. In addition, when the water pressure of the tap water pipe is low, the water supply adjustment period T10 becomes long, and therefore, the detergent supply process may be completed within the water supply adjustment period T10.

In the present embodiment, in the water supply adjustment period T10, the first water supply valve 34 is opened after the second water supply valve 35 is opened. That is, in the water supply adjustment period T10, after the water supply from the second water supply port 33 is performed, the water supply from the first water supply port 32 is switched. Since the discharge amount per unit time of the second water supply port 33 is smaller than that of the first water supply port 32, it is easy to adjust the length of the first period T1 in which the second water supply valve 35 is opened. Therefore, even when the second period T2 in which the first water supply valve 34 is opened due to a large discharge amount per unit time from the first water supply port 32 is short, the time for the detergent supply process can be ensured to some extent by setting the first period T1 in which the second water supply valve 35 is opened longer. In addition, when the discharge amount per unit time from the first water supply port 32 is small, the second period T2 becomes long, and therefore the detergent supply process can be completed within the water supply adjustment period T10.

(modification)

Further, the water supply process by the water supply control section 51 is not limited to the above-described example. Various modifications of the water supply process will be described below.

(first modification)

In the above example, in the water supply adjustment period T10 from the time T1 when the water level reaches the water detection level and the detergent supply process is started to the time T3 when the water level reaches the second water level, the first water supply valve 34 and the second water supply valve 35 are sequentially opened one by one, but not limited thereto. As shown in fig. 4, in the water supply process of the first modification example, the water supply control unit 51 may open both the first water supply valve 34 and the second water supply valve 35 during the water supply adjustment period T10. That is, the water supply control unit 51 opens both the first water supply valve 34 and the second water supply valve 35 until the water level reaches the second water level in the water supply process. In this way, during the water supply adjustment period T10, water is supplied from both the first water supply port 32 and the second water supply port 33. For example, when the water pressure of tap water in the environment where the washing machine 1 is installed is low, the water supply control unit 51 performs the water supply process according to the first modification. This can suppress the water supply adjustment period T10 from becoming excessively long, and can suppress the time until the water level reaches the first water level from becoming unnecessarily long.

(second modification)

In the above example, in the third period T3 starting from the time T3 when the water level reaches the second water level, the water supply is stopped after the time T4 when the detergent supply process is completed, but the present invention is not limited thereto. As shown in fig. 5, in the water supply process of the second modification example, the water supply control unit 51 may continue the water supply from the second water supply port 33 by continuing the open state of the second water supply valve 35 after the detergent supply amount in the third period T3 reaches the predetermined amount of time T4. This can shorten the time from the third period T3 until the water level reaches the first water level.

In the water supply process, the water supply control unit 51 may open both the first water supply valve 34 and the second water supply valve 35 after the predetermined amount of time T4 is reached in the third period T3. In this case, in the third period T3, the water level may reach the first water level. In this case, the water supply control unit 51 closes the first water supply valve 34 and the second water supply valve 35 when the water level reaches the first water level.

The water supply control unit 51 may open both the first water supply valve 34 and the second water supply valve 35 until the water level reaches the first water level after the third period T3.

(third modification)

In the above example, in the case where the detergent supply amount is less than the prescribed amount at the time when the water level reaches the second water level, the second water supply valve 35 is opened only until the detergent supply amount reaches the prescribed amount, but is not limited thereto. As shown in fig. 6, in the water supply process according to the third modification example, when the detergent supply amount is smaller than the predetermined value at the timing (time t 3) when the water level reaches the second water level, the water supply control unit 51 opens both the first water supply valve 34 and the second water supply valve 35 until the time t6 when the detergent supply amount reaches the predetermined value and the water level reaches the first water level. For example, when the water pressure of tap water in the environment where the washing machine 1 is installed is low, the water supply control unit 51 performs the water supply process according to the first modification. This can shorten the time until the water level reaches the first water level.

Claims (9)

1. A washing machine is characterized by comprising:

a valve unit controlling water supply from the tap water pipe;

a water level detection unit for detecting the water level of the water stored in the washing tank; and

a water supply control part for controlling the valve unit based on the detection result of the water level detection part to perform water supply treatment for accumulating water in the washing tank until the water level reaches a first water level,

the valve unit is provided with:

a first water supply port for discharging water from the tap water pipe;

a second water supply port that discharges water from the water pipe, the discharge amount per unit time being smaller than the first water supply port;

a first water supply valve for opening and closing the first water supply port; and

a second water supply valve for opening and closing the second water supply port;

the water supply control section controls in the water supply process:

starting before starting the supply of the detergent,

the first water supply valve is opened before the water level reaches a second water level lower than the first water level,

and when the supply amount of the detergent is less than the prescribed amount at the time when the water level reaches the second water level, opening the second water supply valve until the supply amount of the detergent reaches the prescribed amount.

2. A washing machine as claimed in claim 1, characterized in that,

in the water supply process, the water supply control unit may include a water supply adjustment period in which only one of the first water supply valve and the second water supply valve is opened until the water level reaches the second water level.

3. A washing machine as claimed in claim 2, characterized in that,

during the water supply adjustment, the water supply control part sequentially opens the first water supply valve and the second water supply valve one by one.

4. A washing machine as claimed in claim 3, characterized in that,

during the water supply adjustment, the water supply control part opens only the first water supply valve after opening only the second water supply valve.

5. A washing machine as claimed in claim 4, characterized in that,

during the water supply adjustment, the water supply control part opens only the first water supply valve until the water level reaches the second water level after opening only the second water supply valve for a prescribed period.

6. A washing machine as claimed in claim 1, characterized in that,

in the water supply process, the water supply control unit opens both the first water supply valve and the second water supply valve until the water level reaches the second water level.

7. A washing machine as claimed in any one of claims 1 to 6, characterized in that,

in the water supply process, when the supply amount of the detergent is smaller than the predetermined amount at the time when the water level reaches the second water level, the water supply control unit opens the second water supply valve until the supply amount of the detergent reaches the predetermined amount and the elapsed time from the water level reaching the second water level reaches a predetermined time.

8. A washing machine as claimed in any one of claims 1 to 6, characterized in that,

in the water supply process, when the supply amount of the detergent is smaller than the predetermined amount at the time when the water level reaches the second water level, the water supply control unit opens both the first water supply valve and the second water supply valve until the supply amount of the detergent reaches the predetermined amount and the water level reaches the first water level.

9. The washing machine as claimed in any one of claims 1 to 8, further comprising:

a shaft portion provided in the washing tank and extending in an up-down direction;

a brush unit extending from the shaft portion toward the inner peripheral surface side of the washing tub,

the second water level is a position of a central portion of the brush unit in the up-down direction.