Washing machine and washing system

Abstract

To provide a washing machine which allows a first treatment agent to act effectively on laundry, while suppressing excessive foaming of the first treatment agent.SOLUTION: A washing machine includes: an outer tub; a washing tub arranged inside the outer tub, and constituted so as to store laundry; a drive part for rotating the washing tub; a water supply device for supplying water to the outer tub; a treatment agent supply device for supplying a first treatment agent or a second treatment agent to the washing tub; and a control part. The control part executes: a first washing step of supplying the first treatment agent to the treatment agent supply device and supplying water to the water supply device; and a second washing step of supplying the second treatment agent to the treatment agent supply device after the first washing step, allowing the water supply device to supply water, and performing a washing operation by the water containing the first treatment agent and the second treatment agent. The first washing step includes: a discharge step of discharging water toward an inner bottom part of the washing tub from the upper part of the washing tub; and a first agitation step of the drive part rotating the washing tub, in a state where the water level of the water stored in the outer tub is lower than a lower end of the inner bottom part of the washing tub.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to washing machines and laundry systems. [Background technology]

[0002] For example, Patent Document 1 discloses a washing machine having a washing tub for storing laundry, an automatic detergent dispenser for dispensing detergent, and an automatic auxiliary agent dispenser for dispensing auxiliary agents.

[0003] The washing machine described in Patent Document 1 executes a first washing step in which a first treatment agent, which is an auxiliary agent, is dispensed, and a second washing step in which a second treatment agent, which is a detergent, is dispensed. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2022-65406 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the washing machine described in Patent Document 1 still has room for improvement in terms of suppressing excessive foaming of the first treatment agent in the first washing step while allowing the first treatment agent to act effectively on the laundry.

[0006] Therefore, an object of the present disclosure is to solve the above problem by providing a washing machine that suppresses excessive foaming of the first treatment agent while allowing the first treatment agent to act effectively on laundry. [Means for solving the problem]

[0007] A washing machine according to one aspect of the present disclosure includes an outer tub, a washing tub arranged inside the outer tub and configured to accommodate laundry, a drive unit for rotating the washing tub, a water supply device for supplying water to the outer tub, a treatment agent supply device for supplying a first treatment agent or a second treatment agent to the washing tub, and a control unit. The control unit performs a first washing step in which the treatment agent supply device supplies the first treatment agent and the water supply device supplies water, and after the first washing step, the control unit performs a second washing step in which the treatment agent supply device supplies the second treatment agent and the water supply device supplies water, and a washing operation is performed using water containing the first treatment agent and the second treatment agent. The first washing step includes a discharge step in which water is discharged from the top of the washing tub toward the inner bottom of the washing tub, and a stirring step in which the drive unit rotates the washing tub while the level of the water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub.

[0008] A laundry system according to one aspect of the present disclosure includes a washing machine and a processing device that communicates with the washing machine via a network. The processing device causes the washing machine to perform a first washing process in which the processing agent supply device of the washing machine supplies a first processing agent and causes the water supply device of the washing machine to supply water. After the first washing process, the processing device causes the processing agent supply device to supply a second processing agent and causes the water supply device to supply water, and performs a washing operation using water containing the first processing agent and the second processing agent. The first washing process includes a discharge step in which the water supply device discharges water toward the inner bottom of the washing tub, and a stirring step in which the washing tub is rotated while the level of water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to provide a washing machine that allows the first treatment agent to act effectively on laundry while suppressing excessive foaming of the first treatment agent. [Brief explanation of the drawings]

[0010] [Figure 1] Schematic front view of a washing machine according to a first embodiment of the present disclosure. [Figure 2] Schematic cross-section of a washing machine [Figure 3] Perspective view of the automatic insertion unit [Figure 4]Schematic diagram of the automatic feeding unit [Figure 5] Flowchart of the first cycle of a washing machine [Figure 6A] Pre-washing process flowchart [Figure 6B] Pre-washing process flowchart [Figure 7] A diagram showing the operation of the washing machine during the pre-washing process [Figure 8] Schematic front view of a washing machine in the pre-washing process [Figure 9] Schematic front view of a washing machine in the pre-washing process [Figure 10] Schematic front view of a washing machine in the pre-washing process [Figure 11] Schematic front view of a washing machine in the pre-washing process [Figure 12] Schematic front view of a washing machine in the pre-washing process [Figure 13] Schematic front view of a washing machine in the pre-washing process [Figure 14] Flowchart of the main washing process [Figure 15] Block diagram of a laundry system according to a second embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0011] (Embodiment 1) A washing machine 1 according to a first embodiment of the present disclosure will be described.

[0012] Fig. 1 is a schematic front view of a washing machine 1 according to a first embodiment of the present disclosure, and Fig. 2 is a schematic cross-sectional view of the washing machine 1.

[0013] The washing machine 1 according to the first embodiment is a drum type washing machine having a washing function. To perform the washing function, the washing machine 1 can perform a washing process including two processes (a pre-washing process and a main washing process). The washing machine 1 may also have a drying function.

[0014] As shown in FIG. 1, the washing machine 1 includes a housing 2, an outer tub 3, a drum 4, a drive unit 5 (FIG. 2), a water supply valve 10, a drain valve 11, a water level sensor 12, a circulation flow path 13, a circulation pump 14, a laundry amount detection unit 15 (FIG. 2), a control unit 16, and an operation unit 17.

[0015] Washing machine 1 further includes an automatic dispensing unit 6 and a connecting flow path 8, which supplies a treatment agent to outer tub 3. The treatment agent is used when treating clothes, towels, sheets, etc. in washing machine 1. The treatment agent in embodiment 1 is in liquid form.

[0016] The housing 2 is a member that forms the exterior of the washing machine 1. As shown in Fig. 2, an opening 20 and a door 21 that covers the opening 20 and can be opened and closed are provided on the front surface of the housing 2.

[0017] The outer tub 3 is a generally cylindrical member provided inside the housing 2 and functions to store wash water. The outer tub 3 may also be called a water tub or a tub. The outer tub 3 is provided in an opening 31 at a position facing the opening 20 of the housing 2, and the edge of the opening 31 is connected to the opening 20 by a bellows 32. The axis passing through the center of the bottom of the outer tub 3 is defined as a central axis V0. The outer tub 3 is disposed at an angle such that the central axis V0 is at an angle with respect to the horizontal.

[0018] The drum 4 is a generally cylindrical member that is rotatable around a central axis V0 inside the outer tub 3 and can accommodate laundry. The drum 4 may also be referred to as a washing tub, an inner tub, or a storage tub. The drum 4 has a number of through-holes 40 that connect the drum 4 to the outer tub 3. The drum 4 has an opening 41 at a position facing the opening 20 in the housing 2 and the opening 31 in the outer tub 3. When the user opens the door 21, they can place laundry into the drum 4 through the openings 20, 31, and 41.

[0019] The driving unit 5 is a member that drives the drum 4 to rotate around the central axis V0. The driving unit 5 has, for example, a motor that rotates the drum 4.

[0020] The automatic dispensing unit 6 is a device that automatically dispenses a predetermined amount of treatment agent from a tank that stores multiple doses of treatment agent into the outer tub 3. The predetermined amount of treatment agent in the automatic dispensing unit 6 is an appropriate amount and type of treatment agent determined by the control unit 16 in accordance with, for example, the weight of the laundry, the amount of water supplied, or user input.

[0021] The treatment agent supplied from the tank of the automatic supply unit 6 to the outer tub 3 includes a main washing agent (second treatment agent) supplied in the main washing step and an auxiliary agent (first treatment agent) supplied in the pre-washing step.

[0022] This cleaning agent is a treatment agent for removing ordinary dirt, and is supplied to the outer tub 3 in the main washing process. This cleaning agent is a treatment agent that removes dirt by penetrating, wetting, emulsifying, solubilizing, dispersing, etc. In the first embodiment, this cleaning agent is a detergent that disperses dirt.

[0023] The auxiliary agent is a treatment agent that enhances the effects of the main washing agent and is supplied to the outer tub 3 in a pre-wash step performed before the main washing step. In the first embodiment, the auxiliary agent is a treatment agent that exerts its effect by penetrating into the laundry or an agent that exerts its effect by dispersing in the washing liquid. Specifically, the auxiliary agent is a fiber protection agent that prevents pilling and shrinkage, a dye transfer inhibitor, a redeposition inhibitor, a bleach, a fragrance, a water softener, an alkali agent, or an enzyme or surfactant that disperses or alters dirt. In other words, the auxiliary agent is a treatment agent that plays a different role from the main washing agent, such as further enhancing basic performance such as cleaning or adding new performance.

[0024] By performing a pre-wash process including the supply of an auxiliary agent before the main wash process, the washing machine 1's processing capacity for laundry can be increased. For example, it is possible to increase the cleaning power of the main detergent to more reliably remove dirt from laundry, reduce the hardness of the water to prevent a decrease in cleaning power, suppress the occurrence of pilling and fuzzing during washing and fiber shrinkage, and suppress the re-adhesion of dirt that has been removed once. The pre-wash process is performed in conjunction with the main wash process, for example, to remove stubborn stains such as stains on collars and sleeves that require pre-care treatment before washing or to prevent pilling and fuzzing from occurring on clothes in processes after the main wash process.

[0025] The connection flow path 8 connects the automatic dosing unit 6 to the outer tank 3. Therefore, water and treatment agent flow from the automatic dosing unit 6 into the outer tank 3 through the connection flow path 8. Because the automatic dosing unit 6 is disposed above the outer tank 3, the connection flow path 8 extends downward.

[0026] The water supply valve 10 has an openable / closable valve connected to a water faucet via an external hose. When the water supply valve 10 is opened, water is supplied to the outer tub 3. Specifically, when the water supply valve 10 is opened, water flows into the outer tub 3 via the automatic dosing unit 6 and the connecting flow path 8.

[0027] Returning to FIG. 1, the water supplied to the outer tub 3 by the water supply valve 10 flows along the inner circumferential surface of the outer tub 3 below the connecting flow path 8 and accumulates in the lower part of the outer tub 3.

[0028] Instead of or in addition to the water supply valve 10, other water supply devices for supplying water to the outer tub 3 and the drum 4 may be provided.

[0029] The drain valve 11 is a valve that can be opened and closed, and when closed, it stores water in the outer tub 3, and when open, it drains the water stored in the outer tub 3. The drain valve 11 is provided below the outer tub 3. However, instead of the drain valve 11, another drain device for draining water from the drum 4 may be provided.

[0030] The water level sensor 12 has a sensor that detects the water level in the outer tub 3. Specifically, the water level sensor 12 is connected to the bottom of the outer tub 3 via an air hose 12a. When the water level in the outer tub 3 changes, water flows into the air hose 12a, and the pressure in the water level sensor 12 changes via the air hose 12a. The water level sensor 12 can detect the water level in the outer tub 3 by detecting the pressure.

[0031] The water level sensor 12 may detect the water level by detecting the amount of movement of a float or by using a capacitance method.

[0032] The circulation flow path 13 is provided inside the housing 2 and is connected to the outer tub 3. Specifically, both the suction port 13a and the discharge port 13b of the circulation flow path 13 are connected to the outer tub 3, and circulate the water inside the outer tub 3. The suction port 13a is connected to the lower part of the outer tub 3, and the discharge port 13b is connected to the upper part of the outer tub 3.

[0033] Circulation pump 14 is provided in circulation flow path 13 and has a pump that generates a water flow in circulation flow path 13. Circulation pump 14 generates a water flow in circulation flow path 13 from suction port 13a toward discharge port 13b.

[0034] 2, laundry amount detection unit 15 has a sensor that detects the amount of laundry accommodated in drum 4. Laundry amount detection unit 15 has, for example, a sensor that measures the weight of the laundry. Specifically, laundry amount detection unit 15 has a sensor that measures the voltage applied to the motor of drive unit 5 and a control circuit that converts the measured voltage into torque applied to drive unit 5 when drive unit 5 rotates and calculates the weight of the laundry based on the torque. Alternatively, laundry amount detection unit 15 may be included in control unit 16.

[0035] Control unit 16 is a controller that controls washing machine 1. Control unit 16 controls components of washing machine 1 such as drive unit 5, automatic dosing unit 6, water supply valve 10, drain valve 11, circulation pump 14, and operation unit 17. Control unit 16 includes a general-purpose processor such as a CPU, MPU, FPGA, DSP, or ASIC that executes a program to realize a predetermined function. Control unit 16 can realize various controls of washing machine 1 by calling and executing a control program stored in memory unit 16a. Control unit 16 is not limited to a device that realizes a predetermined function through cooperation between hardware and software, and may be a hardware circuit designed specifically to realize a predetermined function.

[0036] The storage unit 16a is a recording medium that records various information and control programs, and may be a memory that functions as a work area for the control unit 16. The storage unit 16a is realized by, for example, a flash memory, an SSD (Solid State Device), a hard disk, a RAM, other storage devices, or an appropriate combination of these.

[0037] The memory unit 16a stores the operating conditions of the washing courses, i.e., the pre-washing process, the main washing process, the rinsing process, and the spin-drying process, executed by the washing machine 1. Specifically, the memory unit 16a stores the operating conditions of the drive unit 5, the operating conditions of the automatic dosing unit 6, the opening / closing conditions of the water supply valve 10, the opening / closing conditions of the drain valve 11, and the operating conditions of the circulation pump 14, for each process.

[0038] The memory unit 16a further stores information about the treatment agent. Specifically, the memory unit 16a stores the type of treatment agent contained in the tank of the automatic dispensing unit 6. For example, the memory unit 16a stores whether the type of treatment agent contained in each tank of the automatic dispensing unit 6 is a detergent, fabric softener, or auxiliary agent.

[0039] Operation unit 17 is the part of washing machine 1 that is operated by the user. Operation unit 17 may be configured with one or more buttons, or may be configured with a liquid crystal touch panel. Operation unit 17 includes a start button or a display that functions as a start button. Control unit 16 controls washing machine 1 in response to a user's operation on operation unit 17.

[0040] The user can set information about the washing course to be executed by the washing machine 1 via the operation unit 17. Specifically, the user can set the type of washing course to be executed by the washing machine 1. Furthermore, if the user wants to execute a washing course under operating conditions different from those stored in the memory unit 16a, the user can manually input and set the operating conditions of the washing course.

[0041] The user can further set the type of treatment agent stored in the automatic dispensing unit 6 by inputting the type of treatment agent via the operation unit 17. For example, the user may set one of "detergent," "fabric softener," or "auxiliary agent" as the type of treatment agent. For example, the user sets the type of treatment agent before using the washing machine 1 or when filling or refilling the automatic dispensing unit 6 with the treatment agent. The set type of treatment agent is stored in the memory unit 16a.

[0042] Next, a more detailed description will be given of the structure of the automatic feeding unit 6. Fig. 3 is a perspective view of the automatic feeding unit 6. Fig. 4 is a schematic diagram of the automatic feeding unit 6.

[0043] As shown in FIG. 3, the automatic dispensing unit 6 has a case 61, tanks 62A to 62C, pump mechanisms 63A to 63C, and a treatment agent discharge flow path 64.

[0044] Case 61 is a container with an open top so as to house three tanks 62 A to 62 C. Pump mechanisms 63 A, 63 B, 63 C, a treatment agent discharge flow path 64, and a water supply valve 10 are connected to rear surface 57 of case 61.

[0045] The tanks 62A to 62C are containers for storing treatment agents including auxiliary agents and main cleaning agents. The tanks 62A to 62C are housed in the case 61 and lined up on the outer side K1 (horizontally away from the central axis V0 in FIG. 1). The depth and volume of the three tanks 62A to 62C increase on the outer side K1.

[0046] In the first embodiment, taking into consideration the type of treatment agent and the capacity of tanks 62A to 62C, less frequently used treatment agents are stored in tanks with smaller capacities. For example, tank 62C stores the main cleaning agent (detergent), tank 62B stores fabric softener, and tank 62A stores auxiliary agent. Tanks 62A to 62C may also store other types of treatment agents.

[0047] Tanks 62A to 62C are detachable from case 61 so that the processing agent can be replenished when the remaining amount becomes low.

[0048] Pump mechanisms 63A, 63B, and 63C are devices that suck a predetermined amount of processing agent from tanks 62A, 62B, and 62C, respectively, and discharge the same into processing agent discharge flow path 64. As shown in Fig. 4, pump mechanisms 63A, 63B, and 63C are connected to tanks 62A, 62B, and 62C, respectively, in the X direction via rear surface 57 of case 61. While Fig. 4 shows one tank 62A and one pump mechanism 63A, the other tanks 62B to 62C and pump mechanisms 63B to 63C have similar configurations.

[0049] The pump mechanisms 63A, 63B, and 63C of the present embodiment each include a piston pump. However, the pump mechanisms 63A, 63B, and 63C are not limited to those including a piston pump, and may include, for example, an on-off valve mechanism that discharges liquid by gravity, a gear pump, or the like.

[0050] A treatment agent discharge flow path 64 is connected below the pump mechanisms 63A to 63C. The treatment agent discharge flow path 64 is a flow path member connected to the case 61, and returns water flowing in from the case 61 to the treatment agent discharged from the pump mechanisms 63A to 63C after merging with the water, which is returned to the case 61. The case 61 is provided with a flow path below the tanks 62A to 62C, which is connected to the treatment agent discharge flow path 64 and through which the water and the treatment agent flow.

[0051] Next, the flow of water and processing agent in the automatic feeding unit 6 will be described.

[0052] As shown in Fig. 3, water supplied from the water supply valve 10 flows into the case 61 from the top of the case 61 and falls toward the bottom of the case 61. The water passes along the bottom of the case 61, below the tanks 62A to 62C, and is supplied to the outer tank 3 (Fig. 2) via the connecting flow path 8.

[0053] A portion of the water supplied from the water supply valve 10 flows from the case 61 into the treatment agent discharge flow path 64. The treatment agent discharged from the pump mechanisms 63A to 63C into the treatment agent discharge flow path 64 merges with the water in the treatment agent discharge flow path 64. The treatment agent and water flow along the slope of the treatment agent discharge flow path 64, enter the case 61, and are then supplied to the outer tub 3 via the connecting flow path 8. In other words, the treatment agent is supplied to the outer tub 3 by the flow of water that occurs when water is supplied.

[0054] [Operation] An example of the operation of the washing machine 1 having the above configuration will be described.

[0055] As preparation, the user puts dirty laundry into drum 4. The user sets the desired washing course through operation unit 17. The washing course that washing machine 1 executes includes course 1. Course 1 is a standard washing course executed to remove dirt from laundry.

[0056] The first course will now be described in more detail with reference to Fig. 5. Fig. 5 is a flowchart of the first course of the washing machine 1.

[0057] When the first course is selected, the control unit 16 refers to the storage unit 16a to acquire the operating conditions for the first course.

[0058] The control unit 16 displays a start button on the operation unit 17. When the user presses the start button, the control unit 16 starts the first course.

[0059] 5, the control unit 16 determines whether or not to execute a pre-washing step (S11). For example, the control unit 16 refers to the memory unit 16a to determine whether or not the type of treatment agent contained in the tanks 62A to 62C has been set, and if it has been set, the control unit 16 executes the pre-washing step, and if it has not been set, the control unit 16 does not execute the pre-washing step. Even if the type of treatment agent has been set, if an auxiliary agent is not included, the control unit 16 may not execute the pre-washing step.

[0060] When the pre-washing step is to be executed (Yes in S11), the control unit 16 executes the pre-washing step (S12) and the main washing step (S13) in this order.

[0061] If the pre-washing step is not performed (No in S11), the control unit 16 performs a separate main washing step (S14). In this case, the pre-washing step is not performed. The separate main washing step may be the same as or different from the main washing step performed after the pre-washing step.

[0062] Next, the control unit 16 executes a rinsing step (S15) and a spin-drying step (S16), thereby completing the first course. In the rinsing step, water is supplied to the outer tub 3, and the drum 4 is rotated to rinse the laundry. In the rinsing step, fabric softener may be supplied to the outer tub 3 along with the supplied water. In the spin-drying step, the drain valve 11 is opened to drain the water from the outer tub 3 to the outside, and then the drive unit 5 (FIG. 2) rotates the drum 4 containing the laundry at high speed to spin the laundry.

[0063] In each step, the operation unit 17 displays the step currently in progress. For example, when the pre-wash step (S12) or the main wash step (S13, S14) is in progress, the operation unit 17 displays "Washing step," when the rinsing step (S15) is in progress, the operation unit 17 displays "Rinsing step," and when the spin wash step (S16) is in progress, the operation unit 17 displays "Spin wash step." Note that when the pre-wash step (S12) is in progress, the operation unit 17 may display "Pre-wash step," and when the main wash step (S13, S14) is in progress, the operation unit 17 may display "Main wash step."

[0064] Here, the pre-washing step (S12) and the main washing step (S13) will be described.

[0065] First, the pre-washing step (S12) will be described in more detail with reference to Figs. 6A to 13. Figs. 6A and 6B are flowcharts of the pre-washing step. Fig. 7 is a diagram showing the operations of the circulation pump 14, pump mechanism 63C, water supply valve 10, drain valve 11, and drive unit 5 in the pre-washing step. Figs. 8 to 13 are schematic front views of the washing machine 1 in the pre-washing step.

[0066] In the initial state of the pre-wash step (S12), in the first embodiment, the water level in the outer tub 3 is at an initial water level Lstart (FIGS. 7 and 8) that is lower than the bottom end of the drum 4, and the laundry in the drum 4 is dry. Note that the initial water level Lstart may be at the bottom end of the outer tub 3, and there may not be any water in the outer tub 3 in the initial state.

[0067] 6A, first, the control unit 16 drives the pump mechanism 63A to suck the auxiliary agent from the tank 62A and discharge it into the treatment agent discharge passage 64 (S31). Specifically, the control unit 16 determines the amount of auxiliary agent to be supplied based on the weight of the laundry detected by the laundry amount detection unit 15 and the user's settings input through the operation unit 17, and operates the pump mechanism 63A for the number of piston strokes or pump drive time corresponding to the determined supply amount.

[0068] Next, the control unit 16 turns on the driving unit 5 (FIG. 2) to rotate the drum 4 (S32).

[0069] Next, the control unit 16 opens the water supply valve 10 to supply water to the outer tub 3 (S33). Steps S33 to S35 may be referred to as a first water supply step. The control unit 16 continues to supply water until the water level in the outer tub 3 reaches the first pre-wash water level L11.

[0070] 7, the first pre-wash water level L11 is the target water level L1 plus a first assumed absorption water level Q1 that is assumed to be absorbed by dry laundry. That is, when water is supplied up to the first pre-wash water level L11, the water level in the outer tub 3 reaches the target water level L1 after the laundry has absorbed the first assumed absorption water level Q1.

[0071] The target water level L1 is a water level lower than the reference water level L0. The reference water level L0 is the height of the lower end of the inner bottom 44 of the drum 4. In the first embodiment, the reference water level L0 is the height passing through the lowermost end of the inner circumferential surface of the inclined drum 4.

[0072] In the first embodiment, the target water level L1 is lower than the lowest end of the outer circumferential surface of the drum 4.

[0073] The first assumed absorption water level Q1 corresponds to the amount of water that dry laundry is expected to absorb, and changes depending on the weight of the laundry. When the laundry weight is heavy, the first assumed absorption water level Q1 becomes high, and when the laundry weight is light, the first assumed absorption water level Q1 becomes low.

[0074] The manufacturer determines the first assumed absorption water level Q1 for each laundry weight level, for example, through experiments using typical laundry. The weight level is a range of weight, and includes ranges such as 0 to less than 3 kg, 3 to less than 5 kg, 5 to less than 7 kg, and 7 to less than 9 kg. The manufacturer calculates the first pre-wash water level L11 for each weight level by adding each determined first assumed absorption water level Q1 to the target water level L1, and stores the calculated value in the memory unit 16a.

[0075] In step S33, the control unit 16 obtains the laundry weight level detected by the laundry amount detection unit 15, and determines the first pre-wash water level L11 corresponding to the obtained weight level by referring to the memory unit 16a.

[0076] 7 and 8, in step S33, the water level in the outer tub 3 rises from the initial water level Lstart to a first pre-wash water level L11. In the first embodiment, the first pre-wash water level L11 is located above the reference water level L0.

[0077] The auxiliary agent discharged into the treatment agent discharge passage 64 in step S31 is supplied to the drum 4 by the water supply in step S33.

[0078] In the first embodiment, step S33 is started simultaneously with step S32. Note that the control unit 16 may execute steps S31 to S33 in an order different from that in the first embodiment, or may execute them simultaneously.

[0079] Next, the control unit 16 determines whether the water level in the outer tub 3 has reached the first pre-wash water level L11 (S34). Specifically, the control unit 16 acquires the water level detected by the water level sensor 12 and determines whether the acquired water level is equal to or higher than the first pre-wash water level L11.

[0080] As shown in Figure 8, water supplied from the water supply valve 10 flows into the outer tub 3 via the automatic dispensing unit 6 and the connecting flow path 8, and accumulates at the bottom along the inner circumferential surface of the outer tub 3. The water supplied from the water supply valve 10 does not need to splash onto the laundry from above.

[0081] If the water level in the outer tub 3 reaches the first pre-wash water level L11 (Yes in S34), the control unit 16 closes the water supply valve 10 (S35).

[0082] If the water level in the outer tub 3 has not reached the first pre-wash water level L11 (No in S34), the control unit 16 returns to the step before S34.

[0083] Subsequently, the control unit 16 turns on the circulation pump 14 (S36). In the first embodiment, step S36 is started simultaneously with step S35.

[0084] 9, when the circulation pump 14 is turned on, the water accumulated in the lower part of the outer tub 3 is pumped up and discharged from the discharge port 13b in the upper part. Therefore, steps S36 to S37 may be referred to as a first discharge step.

[0085] In this embodiment, the circulation pump 14 is always ON during the first discharge step. In other words, the circulation pump 14 is continuously driven during the first discharge step. Note that the control unit 16 may also drive the circulation pump 14 intermittently during the first discharge step.

[0086] The wash water discharged from discharge port 13b is discharged toward inner bottom 44 of drum 4 and hits the laundry accumulated at the bottom of drum 4 from above. In the first embodiment, the discharged wash water is discharged toward the inner circumferential surface of drum 4. At the start of step S36, the laundry is dry, so the water that hits the laundry is efficiently absorbed by the laundry.

[0087] Furthermore, since the laundry is agitated by the rotation of drum 4, the discharged washing water hits the laundry evenly and is absorbed evenly.

[0088] 7 and 9, as step S36 progresses, the laundry absorbs water and becomes wet. As the laundry absorbs water, the water level in the outer tub 3 drops to the pump driving water level L2. The pump driving water level L2 is lower than the target water level L1.

[0089] The driving condition of the circulation pump 14 may be a condition in which the pump driving water level L2 is located above the suction port 13a. Specifically, the driving of the circulation pump 14 may be stopped before a predetermined time has elapsed, which is an experimentally determined value of the time it takes for the water level in the outer tub 3 to decrease to the pump driving water level L2, or before the actual water level in the outer tub 3 is detected and reaches the height of the suction port 13a. This setting can prevent air from being sucked into the circulation flow path 13 instead of water when the circulation pump 14 is driven. This can prevent a decrease in pump efficiency, abnormal noise, or malfunction caused by air being sucked into the circulation pump 14.

[0090] Next, the control unit 16 determines whether a predetermined time has elapsed since the circulation pump 14 was turned on (S37), and if so (Yes in S37), turns off the circulation pump 14 (S38).

[0091] If the predetermined time has not elapsed (No in S37), the control unit 16 returns to the step before step S37.

[0092] 7 and 10, in step S38, drive unit 5 remains ON, so drum 4 rotates and agitates the laundry. Therefore, steps S38 to S39 may be referred to as a first agitation step.

[0093] On the other hand, since the circulation pump 14 is turned off, the water in the circulation flow path 13 returns to the outer tub 3, and the water level in the outer tub 3 rises from the pump driving water level L2 to the target water level L1.

[0094] Because the target water level L1 is lower than the reference water level L0, the control unit 16 can rotate the drum 4 in a state where the water level in the outer tub 3 is lower than the reference water level L0 (i.e., the bottom end of the drum 4). In other words, the liquid level in the outer tub 3 is separated from the bottom end of the rotating drum 4. This step prevents the rotating drum 4 from stirring up the water accumulated in the outer tub 3 and prevents the auxiliary agent contained in the water from being excessively foamed.

[0095] By rotating the drum 4, the wet laundry is agitated, and the water discharged in step S36 can be made to blend into the laundry.

[0096] Next, the control unit 16 turns off the drive unit 5 (S39).

[0097] 6B, the control unit 16 then opens the water supply valve 10 to supply water to the outer tub 3 (S40). Steps S40 to S42 may be referred to as a second water supply step. The control unit 16 continues to supply water until the water level in the outer tub 3 reaches the second pre-wash water level L12.

[0098] 7, the second pre-wash water level L12 is the target water level L1 plus a second assumed absorption water level Q2 that is assumed to be absorbed by wet laundry. That is, when water is supplied up to the second pre-wash water level L12, the water level in the outer tub 3 reaches the target water level L1 after the laundry has absorbed the second assumed absorption water level Q2.

[0099] The second assumed absorption water level Q2 corresponds to the amount of water that wet laundry is expected to absorb, and like the first assumed absorption water level Q1, it changes depending on the weight of the laundry. However, because wet laundry absorbs less water than dry laundry, the second assumed absorption water level Q2 is lower than the first assumed absorption water level Q1. Therefore, the second pre-wash water level L12 is lower than the first pre-wash water level L11.

[0100] The manufacturer determines the second estimated absorption water level Q2 in the same manner as the first estimated absorption water level Q1, and calculates the second pre-wash water level L12 for each weight level by adding the second estimated absorption water level Q2 to the target water level L1, and stores it in the memory unit 16a.

[0101] In step S40, the control unit 16 obtains the laundry weight level detected by the laundry amount detection unit 15, and determines the second pre-wash water level L12 corresponding to the obtained weight level by referring to the memory unit 16a.

[0102] 7 and 11, in step S40, the water level in the outer tub 3 rises from the target water level L1 to a second pre-wash water level L12. In the first embodiment, the second pre-wash water level L12 is located above the reference water level L0.

[0103] In the first embodiment, step S40 is started simultaneously with step S39. That is, during the water supply in step S40, the driving unit 5 and the circulation pump 14 are turned off.

[0104] Next, the control unit 16 determines whether the water level in the outer tub 3 has reached the second pre-wash level L12 (S41). Specifically, the control unit 16 acquires the water level detected by the water level sensor 12 and determines whether the acquired water level is equal to or higher than the second pre-wash level L12.

[0105] If the acquired water level in the outer tub 3 reaches the second pre-wash water level L12 (Yes in S41), the control unit 16 closes the water supply valve 10 (S42).

[0106] If the acquired water level in the outer tub 3 has not reached the first pre-wash water level L11 (No in S41), the control unit 16 returns to the state before step S41.

[0107] Next, the control unit 16 turns on the driving unit 5 to rotate the drum 4 (S43).

[0108] Subsequently, the control unit 16 turns on the circulation pump 14 (S44). In the first embodiment, step S44 is started simultaneously with steps S42 and S43.

[0109] In this embodiment, in step S44, the circulation pump 14 is always ON. In other words, the circulation pump 14 is driven continuously in step S44. Note that in step S44, the control unit 16 may drive the circulation pump 14 intermittently.

[0110] 12, when the circulation pump 14 is turned on, the water accumulated in the lower part of the outer tub 3 is pumped up and discharged from the discharge port 13b in the upper part. Therefore, steps S44 to S45 may be referred to as a second discharge step.

[0111] As in step S36, the wash water discharged from discharge port 13b is discharged toward inner bottom 44 of drum 4 and hits the laundry accumulated in the lower part of drum 4 from above. The water that hits the laundry is absorbed by the laundry.

[0112] 7 and 12, in step S44, the water level in the outer tub 3 drops to the pump driving water level L2 due to the absorption of water by the laundry. However, because the laundry is already wet, the drop in the water level in step S44 is smaller than that in step S36.

[0113] Next, the control unit 16 determines whether a predetermined time has elapsed since the circulation pump 14 was turned on (S45), and if so (Yes in S45), turns off the circulation pump 14 (S46).

[0114] If the predetermined time has not elapsed (No in S45), the control unit 16 returns to the state before step S45.

[0115] 7 and 13, in step S46, drive unit 5 remains ON, so drum 4 rotates and agitates the laundry. Therefore, steps S46 to S48 may be referred to as a second agitation step.

[0116] On the other hand, since the circulation pump 14 is turned off, the water in the circulation flow path 13 returns to the outer tub 3, and the water level in the outer tub 3 rises from the pump driving water level L2 to the target water level L1.

[0117] As in step S38, since the target water level L1 is lower than the reference water level L0, the control unit 16 can rotate the drum 4 in a state where the water level in the outer tub 3 is lower than the reference water level L0 (i.e., the bottom end of the drum 4). By rotating the wet laundry, the water discharged in step S44 can be applied to the laundry.

[0118] Next, the control unit 16 determines whether a predetermined time has elapsed since the circulation pump 14 was turned off (S47), and if so (Yes in S47), turns off the drive unit 5 (S48). For example, the predetermined time may be 1 minute 30 seconds or more.

[0119] If the predetermined time has not elapsed (No in S47), the control unit 16 returns to the state before step S47.

[0120] At this point, the control unit 16 ends the pre-washing process. At the end of the pre-washing process, as shown in Figures 7 and 13, the water level in the outer tub 3 is at the target water level L1, which is lower than the bottom end of the drum 4. The water in the outer tub 3 contains an auxiliary agent.

[0121] The water containing the auxiliary agent is also used in the main washing step so that the auxiliary agent can exert its effect in the subsequent main washing step. Therefore, between the pre-washing step and the main washing step, the control unit 16 keeps the drain valve 11 closed and does not drain water.

[0122] Even if the drain step is omitted, lowering the water level at the end of the pre-wash step (target water level L1) increases the difference Q3 (Figure 7) between the target water level L1 and the water level reached in the main wash step (main wash water level L13). In other words, keeping the water level low in the pre-wash step ensures a larger amount of water can be supplied to the outer tub 3 in the main wash step.

[0123] By letting more water flow in the main washing step, it is possible to prevent detergent from remaining in the automatic dispensing unit 6 and to prevent clogging of the water supply path such as the treatment agent discharge flow path 64.

[0124] The main washing step (S13) will be described with reference to Fig. 14. Fig. 14 is a flowchart of the main washing step (S13).

[0125] 14, first, the control unit 16 drives the pump mechanism 63C to suck the detergent (main cleaning agent) from the tank 62C and discharge it into the treatment agent discharge passage 64 (S51). The control unit 16 determines the amount of detergent to be supplied based on the laundry weight detected by the laundry amount detection unit 15 and the user's settings input through the operation unit 17, and operates the pump mechanism 63C for the number of strokes or pump drive time corresponding to the determined supply amount.

[0126] Next, the control unit 16 turns on the driving unit 5 to rotate the drum 4 (S52).

[0127] Next, the control unit 16 opens the water supply valve 10 to supply water to the outer tub 3 (S53).

[0128] Control unit 16 determines main wash water level L13 based on the weight of the laundry. Specifically, control unit 16 obtains the weight of the laundry detected by laundry amount detection unit 15, and references memory unit 16a to obtain main wash water level L13 corresponding to the obtained weight of the laundry.

[0129] The main wash water level L13 is higher than the target water level L1 and the reference water level L0. On the other hand, the main wash water level L13 is lower than the water level at which water overflows from the outer tub 3. Therefore, it is possible to prevent water from overflowing from the outer tub 3 while ensuring a sufficient amount of water is supplied to reduce detergent residue by supplying water from the target water level L1 to the main wash water level L13.

[0130] The detergent discharged into the treatment agent discharge passage 64 in step S51 is supplied to the drum 4 by the water supply in step S53.

[0131] The control unit 16 may execute steps S51 to S53 in an order different from that of the first embodiment, or may execute steps S51 to S53 simultaneously.

[0132] Next, the control unit 16 determines whether the water level in the outer tub 3 has reached the main wash water level L13 (S54). Specifically, the control unit 16 acquires the water level detected by the water level sensor 12 and determines whether the acquired water level is equal to or higher than the main wash water level L13.

[0133] If the acquired water level in the outer tub 3 reaches the main wash water level L13 (Yes in S54), the control unit 16 closes the water supply valve 10 (S55).

[0134] If the acquired water level in the outer tub 3 has not reached the main wash water level L13 (No in S54), the control unit 16 returns to before step S54.

[0135] Next, the control unit 16 turns on the circulation pump 14 (S56). Step S56 may be started simultaneously with step S55. In the main washing step, the control unit 16 may operate the circulation pump 14 intermittently.

[0136] Because the laundry has absorbed water in the pre-washing step, it is difficult for the laundry to further absorb the water discharged from the circulation flow path 13 in step S56. Therefore, the amount of decrease in the water level in the outer tub 3 is smaller than the amount of decrease in the discharge step of the pre-washing step, and the water level is higher than the reference water level L0.

[0137] Because drive unit 5 remains ON, drum 4 rotates and agitates the laundry while the water level is higher than reference water level L0. Therefore, steps S56 to S58 may be referred to as a third agitation step. These steps allow the detergent to act evenly on the laundry.

[0138] Next, the control unit 16 determines whether a predetermined time has elapsed since the circulation pump 14 was turned on (S57), and if so (Yes in S57), the control unit 16 turns off the drive unit 5 and the circulation pump 14 (S58) and ends the main washing step (S12). If the predetermined time has not elapsed (No in S57), the control unit 16 returns to before step S57.

[0139] (summary) The above explanations are summarized to describe the features of the present disclosure.

[0140] The washing machine 1 according to the first embodiment executes a pre-washing process in which an auxiliary agent is supplied before the main washing process in order to enhance the effect of the detergent supplied in the main washing process.

[0141] In order to utilize the auxiliary agent supplied in the pre-wash process in the main wash process, the water containing the auxiliary agent is not drained after the pre-wash process, but is also used in the main wash process. However, not draining the water between the pre-wash and main wash processes reduces the amount of water that can be added to the main wash process up to the water level where overflow occurs. This makes it difficult to ensure a sufficient amount of water is supplied to completely wash away the detergent, which can result in detergent residue.

[0142] In the present disclosure, the water level in the pre-washing step is lowered to make it easier to ensure the amount of water supplied in the main washing step.

[0143] However, simply lowering the water level during the pre-wash step makes it difficult for the laundry to become wet, making it difficult for the auxiliary agent to act on the laundry. Therefore, by providing a discharge step during the pre-wash step, water can be applied to the laundry, allowing it to be absorbed. By rotating the drum 4 during the discharge step to agitate the laundry, the laundry can be more evenly wetted. Furthermore, by stopping the circulation pump 14 and performing an agitation step after the discharge step, the discharged water can be mixed into the laundry, allowing the laundry to be more evenly wetted.

[0144] By lowering the water level in the pre-wash step below the reference water level L0, it is possible to prevent the drum 4 from stirring up the water containing the auxiliary agent in the agitation step. This prevents excessive foaming in the drum 4, and prevents the washing machine 1 from overflowing with foam or from breaking down.

[0145] Therefore, the pre-washing step of the present disclosure allows the auxiliary agent to act uniformly on the laundry while keeping the water level low and suppressing excessive foaming of the auxiliary agent.

[0146] [effect] The washing machine 1 according to the first embodiment can achieve the following effects.

[0147] As described above, washing machine 1 of embodiment 1 includes outer tub 3, drum 4 (washing tub) arranged inside outer tub 3 and configured to accommodate laundry, and drive unit 5 for rotating drum 4. Washing machine 1 also includes water supply valve 10 (water supply device) that supplies water to outer tub 3, automatic dosing unit 6 (treatment agent supply device) that supplies auxiliary agent (first treatment agent) or detergent (second treatment agent) to drum 4, and control unit 16. Control unit 16 executes a pre-wash step (first wash step) and a main wash step (second wash step) after the pre-wash step. In the pre-wash step, control unit 16 controls automatic dosing unit 6 to supply the auxiliary agent and water supply valve 10 to supply water. In the main wash step, control unit 16 controls automatic dosing unit 6 to supply detergent and water supply valve 10 to supply water, and performs a washing operation using water containing the auxiliary agent and detergent. The pre-washing process includes discharge steps (S36 to S37, S44 to S45) in which water is discharged from the top of the drum 4 toward the inner bottom 44 of the drum 4, and agitation steps (S38 to S39, S46 to S48) in which the drive unit 5 rotates the drum 4 while the water level stored in the outer tub 3 is lower than the lower end of the inner bottom 44 of the drum 4.

[0148] With this configuration, even while keeping the water level low during the pre-washing process, the discharge step allows the water to be applied to the laundry and absorbed. Furthermore, by keeping the water level lower than the reference water level L0, the drum 4 can be prevented from stirring up the water containing the auxiliary agent and foaming the auxiliary agent during the agitation step. Therefore, by keeping the water level low during the pre-washing process, excessive foaming of the auxiliary agent can be prevented, and the auxiliary agent can be applied evenly to the laundry.

[0149] Washing machine 1 of embodiment 1 further includes drain valve 11 for draining water from outer tub 3. Control unit 16 controls drain valve 11 so that drain valve 11 remains closed between the agitation step of the pre-wash process and the main wash process.

[0150] With this configuration, water containing the auxiliary agent can be used in the main washing step, and the auxiliary agent can also be used in the main washing step.

[0151] Washing machine 1 of embodiment 1 further includes circulation flow path 13 connecting the upper and lower parts of outer tub 3, and circulation pump 14 circulating water within circulation flow path 13. In the discharge steps (S36 to S37, S44 to S45), control unit 16 drives circulation pump 14.

[0152] This configuration allows the laundry to be wet.

[0153] In the washing machine 1 of the first embodiment, the control unit 16 executes a water supply step (S33 to S35, S40 to S42) in which the water supply valve 10 supplies water before the discharge step (S36 to S37, S44 to S45).

[0154] With this configuration, by providing a discharge step separate from the water supply step, it is no longer necessary to apply water to the laundry in the water supply step, making it easier to reduce the amount of water supplied in the water supply step.

[0155] In the washing machine 1 of the first embodiment, in the discharge steps (S36 to S37, S44 to S45), the control unit 16 stops the water supply by the water supply valve .

[0156] This configuration makes it easier to lower the water level during the pre-wash step.

[0157] In washing machine 1 of the first embodiment, control unit 16 stops water supply by water supply valve 10 in the agitation step (S38 to S39, S46 to S48).

[0158] This configuration makes it easier to lower the water level during the pre-wash step.

[0159] In washing machine 1 of embodiment 1, control unit 16 executes a first discharging step (S36 to S37) and a second discharging step (S44 to S45) as the discharging step. Control unit 16 executes a first water supplying step (S33 to S35) executed before the first discharging step and a second water supplying step (S40 to S42) executed before the second discharging step as the water supplying steps (S33 to S35, S40 to S42).

[0160] With this configuration, the discharge step is divided into two steps, which allows time for the laundry to absorb water, and allows the laundry to absorb more water.

[0161] In the washing machine 1 of the first embodiment, the amount of water supplied in the first water supply step (S33 to S35) is greater than the amount of water supplied in the second water supply step (S40 to S42).

[0162] With this configuration, the amount of water supplied to the dry laundry is made larger than the amount of water supplied to the wet laundry, so that the laundry can be more efficiently absorbed.

[0163] In the washing machine 1 of the first embodiment, the control unit 16 executes, as the agitation step, a first agitation step (S38-S39) executed after the first water supply step (S33-S35) and a second agitation step (S46-S48) executed after the second water supply step (S40-S42). In the first agitation step and the second agitation step, the water level stored in the outer tub 3 is lower than the lower end of the inner bottom 44 of the drum 4.

[0164] With this configuration, it is possible to further prevent the drum 4 from stirring up the water containing the adjuvant and foaming the adjuvant.

[0165] In the washing machine 1 of the first embodiment, the control unit 16 causes the driving unit 5 to rotate the drum 4 before the end of the discharge step (S36 to S37, S44 to S45).

[0166] With this configuration, the laundry is agitated while the water is being discharged, thereby making it possible to wet the laundry more uniformly.

[0167] In the washing machine 1 of the first embodiment, the control unit 16 causes the driving unit 5 to rotate the drum 4 after the discharge step (S36 to S37, S44 to S45) is completed.

[0168] With this configuration, even though the discharge of water is stopped in the agitation steps (S38 to S39, S46 to S48), time for the water to become familiar with the laundry can be ensured.

[0169] In the washing machine 1 of embodiment 1, the main washing process includes a third stirring step (S56 to S58) in which the drive unit 5 rotates the drum 4 while the water level in the outer tub 3 is higher than the lower end of the inner bottom 44 of the drum 4.

[0170] This configuration allows the detergent to be more effective on the laundry.

[0171] In the washing machine 1 of the first embodiment, the second treatment agent is a treatment agent of a different type from the first treatment agent.

[0172] With this configuration, the first treatment agent is more likely to function as an auxiliary agent that enhances the effect of the second treatment agent.

[0173] The present disclosure is not limited to the first embodiment, but can be embodied in various other forms.

[0174] In the first embodiment, the central axis V0 of the outer tub 3 is inclined at an angle relative to the horizontal, but this is not limiting. For example, the washing machine 1 may be a vertical washing machine, and the central axis V0 of the outer tub 3 may extend vertically. In this case, the reference water level L0 is the height of the inner bottom of the inner tub. Specifically, the reference water level L0 is the height passing through the lowest edge of the inner bottom of the inner tub.

[0175] Although the example in which the automatic dosing unit 6 supplies a liquid processing agent to the outer tub 3 has been described, the present invention is not limited to this. For example, the automatic dosing unit 6 may supply a powdered processing agent or a solid processing agent such as a tablet to the outer tub 3.

[0176] In the first embodiment, the treatment agent is supplied by supplying water, but this is not limiting. The treatment agent may be supplied at a timing different from the timing of water supply. For example, the treatment agent may be directly ejected onto the drum 4.

[0177] In the first embodiment, the treatment agent is supplied by the automatic supply unit 6 in the pre-washing step and the main washing step, but the present invention is not limited to this. The treatment agent may also be supplied manually.

[0178] In the first embodiment, the cleaning agent is described as a single detergent, but this is not limiting. The cleaning agent may be one or more of an alkaline agent, a bleaching agent, and an enzyme. On the other hand, if the cleaning agent is a weak alkaline detergent, it is desirable that the auxiliary agent is also alkaline, and if the cleaning agent is an acidic detergent, it is desirable that the auxiliary agent is also acidic. If the cleaning agent is an alkaline detergent or a neutral detergent and the auxiliary agent is alkaline, the cleaning power can be improved. Furthermore, if the cleaning agent is an alkaline detergent and the auxiliary agent is a bleach, the disinfecting effect can be improved.

[0179] In the first embodiment, the cleaning agent and the auxiliary agent are different types of treatment agents, but this is not limiting. The cleaning agent and the auxiliary agent may share one or more components. For example, the cleaning agent and the auxiliary agent may share enzymes, anti-redeposition agents, water softeners, etc. The cleaning agent and the auxiliary agent may also be the same.

[0180] In the first embodiment, the laundry amount detection unit 15 detects the weight of the laundry, but the present invention is not limited to this. For example, the laundry amount detection unit 15 may detect other physical quantities that indicate the amount of laundry, such as the volume of the laundry.

[0181] In the first embodiment, the amount of laundry is detected during the pre-washing process or the main washing process, and the pre-washing water levels L11 and L12 are determined based on the weight of the laundry. However, this is not limiting. The pre-washing water levels L11 and L12 may be preset values.

[0182] In the first embodiment, an example in which only the auxiliary agent contained in the tank 62A is supplied in the pre-washing step has been described, but this is not limiting. Another auxiliary agent may be supplied instead of or in addition to the auxiliary agent contained in the tank 62A.

[0183] In the first embodiment, an example in which operation unit 17 is provided in washing machine 1 has been described, but the present invention is not limited to this. Operation unit 17 may be provided in a device separate from washing machine 1. For example, an application stored in a user's smartphone may function as operation unit 17. Specifically, washing machine 1 may have a communication unit, and the communication unit of washing machine 1 may communicate with the smartphone, and operation unit 17 such as a start button may be displayed on the display of the smartphone.

[0184] In the first embodiment, the control unit 16 determines whether or not the type of auxiliary agent is set and determines whether or not to perform the pre-washing step based on the determination. However, the present invention is not limited to this. For example, the user may input whether or not to perform the pre-washing step, and the control unit 16 may determine whether or not to perform the pre-washing step based on the input.

[0185] In the first embodiment, an example in which the pre-washing process does not include a draining step has been described, but this is not limiting. For example, in the pre-washing process, after step S46 or step S48, the control unit 16 may open the draining valve 11 to drain some of the water in the outer tub 3. Furthermore, after step S46 or step S48, if the water level detected by the water level sensor 12 is higher than the target water level L1 or the reference water level L0, the control unit 16 may open the draining valve 11.

[0186] In the first embodiment, the pre-wash water levels L11 and L12 are higher than the target water level L1, but this is not limiting. The pre-wash water levels L11 and L12 may be lower than the target water level L1 or the reference water level L0. In this case, the laundry is wetted by the water discharged by the circulation pump 14 during the pre-wash step.

[0187] In the first embodiment, an example in which washing machine 1 has circulation flow path 13 and circulation pump 14 has been described, but the present invention is not limited to this. For example, circulation flow path 13 and circulation pump 14 may be omitted, and connection flow path 8 may be connected to the top of outer tub 3 so that water discharged from connection flow path 8 falls on laundry from above. In other words, the discharge step may be realized by a water supply step to outer tub 3.

[0188] In the first embodiment, an example in which the pre-washing process includes two water supply steps has been described, but this is not limiting. The pre-washing process may include any number of water supply steps. Including multiple water supply steps makes it easier to wet the laundry more uniformly. On the other hand, including two water supply steps can prevent the washing process from taking too long.

[0189] In the first embodiment, an example is described in which a step in which circulation pump 14 is turned ON while drive unit 5 is ON is provided in the pre-wash step, but this is not limiting. For example, control unit 16 may cause drive unit 5 to rotate drum 4 immediately after the start of the discharge steps (S36 to S37, S44 to S45). Drive unit 5 may be turned ON either before or after circulation pump 14 is turned ON. If drive unit 5 is ON while circulation pump 14 is ON, the laundry is agitated, changing the area on the laundry that the discharged water hits, allowing the laundry to be more evenly wet.

[0190] In the first embodiment, the discharging step and the stirring step are performed as separate steps, but this is not limiting. The control unit 16 may perform the discharging step and the stirring step in parallel, or may perform them so that they partially overlap.

[0191] In the first embodiment, the water level is maintained at or below the target water level L1 during the stirring step of the pre-washing process, but this is not limiting. During the stirring step, the water level may sometimes exceed the target water level L1.

[0192] (Embodiment 2) A laundry system 201 according to a second embodiment of the present disclosure will be described. In the second embodiment, differences from the first embodiment will be mainly described, and descriptions that overlap with the first embodiment will be omitted. In the second embodiment, the same or equivalent configurations as those in the first embodiment will be described with the same reference numerals.

[0193] FIG. 15 is a block diagram of a laundry system 201 according to the second embodiment of the present disclosure.

[0194] As shown in FIG. 15, a laundry system 201 includes a washing machine 202, a terminal device 222, and a processing device 212.

[0195] Washing machine 202 has first communication unit 204. First communication unit 204 is capable of communicating with terminal device 222 via a network. First communication unit 204 includes a circuit that performs communication in accordance with a predetermined communication standard (e.g., LAN, Wi-Fi (registered trademark), Bluetooth (registered trademark)). Washing machine 202 in the second embodiment is the same as washing machine 1 in the first embodiment unless otherwise specified.

[0196] Terminal device 222 is a device capable of communicating with washing machine 202 and processing device 212. Terminal device 222 is, for example, a smartphone. Terminal device 222 may also function as operation unit 17 of the first embodiment.

[0197] The processing device 212 includes a processing unit 213 and a second communication unit 214. The processing device 212 is a computer. For example, the processing device 212 is a server or a cloud.

[0198] The processing unit 213, in place of the storage unit 16a according to the first embodiment, stores the operation conditions of the washing courses to be executed by the washing machine 202, that is, the pre-washing process, the main washing process, the rinsing process, and the spin-drying process.

[0199] The second communication unit 214 is capable of communicating with the terminal device 222 via a network. The second communication unit 214 includes a circuit that performs communication in accordance with a predetermined communication standard (for example, LAN, Wi-Fi (registered trademark), Bluetooth (registered trademark)).

[0200] The user selects an operation course on terminal device 222. In response to the user's selection, processing device 212 transmits the operation conditions of the selected operation course to terminal device 222 via second communication unit 214. When the user operates terminal device 222, terminal device 222 transmits the operation conditions of the selected course to first communication unit 204. Washing machine 202 executes the operation course based on the operation conditions received by first communication unit 204.

[0201] It should be noted that the terminal device 222 may be omitted, and the washing machine 202 and the processing device 212 may communicate directly with each other.

[0202] A first aspect of the washing machine includes an outer tub, a washing tub arranged inside the outer tub and configured to accommodate laundry, a drive unit for rotating the washing tub, a water supply device for supplying water to the outer tub, a treatment agent supply device for supplying a first treatment agent or a second treatment agent to the washing tub, and a control unit. The control unit performs a first washing step in which the treatment agent supply device supplies the first treatment agent and the water supply device supplies water, and after the first washing step, the control unit causes the treatment agent supply device to supply the second treatment agent and the water supply device to supply water, and performs a washing operation using water containing the first treatment agent and the second treatment agent. The first washing step includes a discharge step in which water is discharged from the top of the washing tub toward the inner bottom of the washing tub, and a stirring step in which the drive unit rotates the washing tub while the level of water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub.

[0203] In the second aspect, the washing machine is the same as in the first aspect, but further includes a drain valve for draining water from the outer tub, and the control unit controls the drain valve to maintain a closed state between the agitation step of the first washing process and the second washing process.

[0204] In a third aspect, the washing machine is the washing machine of the first or second aspect, further comprising a circulation flow path connecting the upper and lower parts of the outer tub, and a circulation pump that circulates water within the circulation flow path, and in the discharge step, the control unit drives the circulation pump.

[0205] As a washing machine according to a fourth aspect, in the washing machine according to the third aspect, the control unit executes a water supplying step in which the water supply device supplies water before the discharging step.

[0206] As a washing machine according to a fifth aspect, in the washing machine according to the third or fourth aspect, in the discharging step, the control unit stops the water supply by the water supply device.

[0207] As a washing machine according to a sixth aspect, in the washing machine according to any one of the third to fifth aspects, in the stirring step, the control unit stops the water supply by the water supply device.

[0208] As a washing machine in the seventh aspect, in the washing machine in the fourth aspect, the control unit executes a first discharge step and a second discharge step as the discharge step, and executes a first water supply step executed before the first discharge step and a second water supply step executed before the second discharge step as the water supply step.

[0209] As a washing machine according to an eighth aspect, in the washing machine according to the seventh aspect, the amount of water supplied in the first water supply step is greater than the amount of water supplied in the second water supply step.

[0210] As a washing machine in a ninth aspect, in the washing machine in the seventh or eighth aspect, the control unit executes, as the agitation steps, a first agitation step executed after the first water supply step and a second agitation step executed after the second water supply step, and in the first agitation step and the second agitation step, the water level stored in the outer tub is lower than the lower end of the inner bottom of the washing tub.

[0211] As a washing machine according to a tenth aspect, in the washing machine according to any one of the first to ninth aspects, the control unit causes the drive unit to rotate the washing tub before the discharge step ends.

[0212] As a washing machine according to an eleventh aspect, in the washing machine according to any one of the first to tenth aspects, the control unit causes the drive unit to rotate the washing tub after the discharge step is completed.

[0213] In a washing machine according to a twelfth aspect, in the washing machine according to any one of the first to eleventh aspects, the second washing step includes a third stirring step in which the drive unit rotates the washing tub while the water level in the outer tub is higher than the lower end of the inner bottom of the washing tub.

[0214] A thirteenth aspect of the invention relates to the washing machine of any one of the first to twelfth aspects, wherein the second treatment agent is a treatment agent of a different type from the first treatment agent.

[0215] A washing system in a fourteenth aspect is a washing system comprising a washing machine and a processing device that communicates with the washing machine via a network, in which the processing device causes the washing machine to perform a first washing process in which the processing agent supply device of the washing machine supplies a first processing agent and causes the water supply device of the washing machine to supply water, and after the first washing process, a second washing process in which the processing agent supply device supplies a second processing agent and causes the water supply device to supply water, and performs a washing operation using water containing the first processing agent and the second processing agent, and the first washing process includes a discharge step in which the water supply device discharges water toward the inner bottom of the washing tub, and a stirring step in which the washing tub is rotated while the water level of the water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub.

[0216] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications are to be understood as included within the scope of the present invention as defined by the appended claims unless they depart therefrom. [Industrial Applicability]

[0217] The washing machine of the present disclosure is capable of supplying auxiliary agents and is therefore useful as a domestic washing machine, a commercial washing machine, or any type of washer / dryer (for example, a domestic drum washing machine or a top-loading washing machine). [Explanation of symbols]

[0218] 1 washing machine 2. Case 3 Outer tank 4 Drums 5 Drive unit 6 Automatic feeding unit 8 Connecting Channels 10. Water supply valve 11 Drain valve 12 Water level sensor 13 Circulation flow path 14 Circulation pump 15 Cloth amount detection unit 16 Control Unit 17 Control section 61 cases 62A~62C Tank 63A~63C Pump mechanism

Claims

1. The outer tank and A washing tub arranged inside the outer tub and configured to be able to accommodate laundry; A drive unit that rotates the washing tub; a water supply device that supplies water to the outer tank; a treatment agent supplying device that supplies a first treatment agent or a second treatment agent to the washing tub; a control unit, The control unit a first washing step of causing the treatment agent supply device to supply the first treatment agent and the water supply device to supply water; a second washing step of causing the treatment agent supply device to supply the second treatment agent, causing the water supply device to supply water, and performing a washing operation with water containing the first treatment agent and the second treatment agent, after the first washing step; The first washing step is a discharge step of discharging water from an upper portion of the washing tub toward an inner bottom portion of the washing tub; and a stirring step of rotating the washing tub by the driving unit while the water level of the water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub. washing machine.

2. Further provided is a drain valve for draining water from the outer tank, The control unit controls the drain valve so as to maintain a closed state between the stirring step of the first washing process and the second washing process. The washing machine according to claim 1.

3. The apparatus further includes a circulation flow path connecting the upper and lower parts of the outer tank, and a circulation pump that circulates water within the circulation flow path. In the discharge step, the control unit drives the circulation pump. The washing machine according to claim 1.

4. The control unit executes a water supply step in which the water supply device supplies water before the discharge step. The washing machine according to claim 3.

5. In the discharge step, the control unit stops the water supply by the water supply device. The washing machine according to claim 3.

6. In the stirring step, the control unit stops the water supply by the water supply device. The washing machine according to claim 3.

7. The control unit As the discharging step, a first discharging step and a second discharging step are executed, As the water supply step, a first water supply step that is executed before the first discharge step and a second water supply step that is executed before the second discharge step are executed. The washing machine according to claim 4.

8. The amount of water supplied in the first water supply step is greater than the amount of water supplied in the second water supply step. The washing machine according to claim 7.

9. the control unit executes, as the stirring step, a first stirring step executed after the first water supply step and a second stirring step executed after the second water supply step; In the first stirring step and the second stirring step, the water level of the water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub. The washing machine according to claim 7.

10. The control unit causes the driving unit to rotate the washing tub before the discharge step is completed. The washing machine according to claim 1.

11. The control unit causes the driving unit to rotate the washing tub after the discharge step is completed. The washing machine according to claim 1.

12. The second washing process includes a third stirring step in which the driving unit rotates the washing tub while the water level in the outer tub is higher than the lower end of the inner bottom of the washing tub. The washing machine according to claim 1.

13. the second treatment agent is a treatment agent of a different type from the first treatment agent; 13. The washing machine according to any one of claims 1 to 12.

14. A laundry system comprising a washing machine and a processing device that communicates with the washing machine via a network, The processing device includes: a first washing step of causing a treatment agent supply device of the washing machine to supply a first treatment agent and causing a water supply device of the washing machine to supply water; a second washing step in which, after the first washing step, the washing machine is caused to supply a second treatment agent from the treatment agent supply device, supply water to the water supply device, and perform a washing operation using water containing the first treatment agent and the second treatment agent; The first washing step is a discharging step of discharging water from the water supply device toward the inner bottom of the washing tub; A stirring step of rotating the washing tub in a state where the water level of the water stored in the outer tub is lower than the lower end of the inner bottom of the washing tub, Laundry system.

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