Water circulation system and operation mode switching method

Abstract

In the present invention, a washing system (100) comprises: a path formation unit (51) that forms a circulation path (R1) for first alkaline ionized water (WA1) that circulates through a tank (21), a washing machine (1), and a filter (31); a second pump (29) that causes the first alkaline ionized water (WA1) to flow along a circulation direction (D1); a second switching valve (36) that can open and close first water supply paths (35–37) connecting a water tap (200) and the tank (21); and a switching processing unit that switches water supply modes for the tank (21) between a first mode using the second pump (29) and a second mode using the second switching valve (36).

Description

Water circulation system, method for switching operation mode

[0001] The present disclosure relates to a water circulation system and a method for switching an operation mode.

[0002] Washing machines that wash laundry items such as clothes using ionized water such as alkaline ionized water are known (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2002-224628

[0004] Incidentally, in an emergency such as during a disaster when tap water cannot be used, it is desirable to reuse the alkaline ionized water discharged from the washing machine. In contrast, by using a water circulation device including a filter and a tank and capable of circulating alkaline ionized water along a circulation path passing through the washing machine, the filter, and the tank, it is possible to reuse the alkaline ionized water discharged from the washing machine.

[0005] On the other hand, during normal times, it is conceivable to use tap water without reusing the alkaline ionized water discharged from the washing machine, thereby reducing the burden on the filter. Here, if the attachment or detachment work of the water circulation device to the washing machine is performed every time between normal times and an emergency, it is inconvenient for the user.

[0006] An object of the present disclosure is to provide a water circulation system and a method for switching an operation mode that can reduce the burden of switching work of water used for washing.

[0007] A water circulation system according to one aspect of the present disclosure comprises a tank, a filter, a path forming unit, a pump, a first water supply channel, a first valve, and a switching processing unit. The tank stores water supplied to the washing tub of a washing machine. The filter purifies the water discharged from the washing tub. The path forming unit forms a water circulation path through the tank, the washing tub, and the filter. The pump is located downstream of the washing tub in the water circulation direction and upstream of the tank in the circulation direction in the circulation path, and causes the water to flow along the circulation direction. The first water supply channel connects a water tap to the tank. The first valve can open and close the first water supply channel. The switching processing unit switches the water supply mode to the tank between a first mode using the pump and a second mode using the first valve.

[0008] A method for switching operating modes relating to another aspect of the present disclosure is performed in a water circulation system comprising: a tank for storing water supplied to the washing tub of a washing machine; a filter for purifying the water discharged from the washing tub; a path forming unit for forming a water circulation path through the tank, the washing tub, and the filter; a pump provided downstream of the washing tub in the water circulation direction in the circulation path and upstream of the tank in the circulation direction, for causing the water to flow along the circulation direction; a first water supply channel connecting a water tap to the tank; and a first valve capable of opening and closing the first water supply channel, wherein the water supply mode to the tank is switched between a first mode using the pump and a second mode using the first valve.

[0009] According to this disclosure, the burden of switching the water used for washing can be reduced.

[0010] Figure 1 is a diagram showing the configuration of a washing system according to an embodiment of the present disclosure. Figure 2 is a cross-sectional view showing the configuration of the washing machine in the washing system according to an embodiment of the present disclosure. Figure 3 is a block diagram showing the control system of the washing system according to an embodiment of the present disclosure. Figure 4 is a flowchart showing an example of an operation mode switching process performed in the washing system according to an embodiment of the present disclosure. Figure 5 is a flowchart showing an example of a water supply control process performed in the washing system according to an embodiment of the present disclosure.

[0011] The embodiments of this disclosure will be described below with reference to the attached drawings. Note that the following embodiments are merely examples of embodiments of this disclosure and do not limit the technical scope of this disclosure.

[0012] [Configuration of the washing system 100] First, the configuration of the washing system 100 will be explained with reference to Figure 1. In Figure 1, the circulation path R1 is shown as a dashed line.

[0013] In this disclosure, "washing machine" refers to any equipment that performs various processes on laundry, such as washing. Examples of processes performed on laundry in a washing machine include washing, drying, deodorizing, and disinfecting. Laundry is not particularly limited as long as it is made of a material suitable for washing with alkaline ionized water. Examples of laundry include textile products. Examples of laundry include clothing such as clothes, hats, and gloves; fashion accessories such as shoes, bags, handkerchiefs, and towels; interior furnishings such as curtains and carpets; and bedding such as blankets, towels, and duvet covers.

[0014] The washing system 100 washes clothes and other items to be washed using first alkaline ionized water WA1 (see Figure 1) stored in a tank 21 (see Figure 1). As shown in Figure 1, the washing system 100 comprises a washing machine 1 and a water circulation device 2. The washing system 100 is an example of the water circulation system of the present disclosure. The water circulation system of the present disclosure may also consist of a water circulation device 2.

[0015] [Configuration of Washing Machine 1] Next, the configuration of washing machine 1 will be explained with reference to Figures 1 to 3.

[0016] As shown in Figures 1 and 2, the washing machine 1 comprises a housing 11, a door 12, a washing tub 13, a rotating drum 14, a motor 15, a water supply channel 16, and a drain channel 17. The washing machine 1 also comprises an operation display unit 18 and a control unit 19, as shown in Figure 3.

[0017] The housing 11 houses the various components of the washing machine 1. The housing 11 is formed in a substantially rectangular parallelepiped shape. As shown in Figure 2, an inclined surface is provided on the upper side of one side of the housing 11, which is the front of the washing machine 1, and slopes toward the top surface of the housing 11. A circular opening 11A is provided in the inclined surface. The opening 11A is used for loading laundry into the rotating drum 14 inside the housing 11 and for retrieving laundry from the rotating drum 14. A water inlet 11B is provided on the rear side of the top surface of the housing 11. The water inlet 11B is connected to the second water channel 24 (see Figure 1) of the water circulation device 2. The water inlet 11B is used to supply water to the washing tub 13 inside the housing 11. A drain outlet 11C is provided on the lower side of the left side of the housing 11. The drain outlet 11C is connected to the third water channel 25 (see Figure 1) of the water circulation device 2. The drain port 11C is used for draining water from the washing tub 13 inside the housing 11. Four legs 11D (see Figure 2) are provided on the bottom surface of the housing 11. The four legs 11D are positioned at the four corners of the bottom surface of the housing 11. The drain port 11C may also be provided on the lower right side or bottom surface of the housing 11. The housing 11 may also have five or more legs 11D.

[0018] The door 12 is provided so as to be able to open and close the opening 11A. For example, the door 12 is formed in the shape of a disc. The door 12 is attached to the opening 11A via a hinge (not shown) provided on either the left or right side of the opening 11A.

[0019] The washing tub 13 stores the first alkaline ionized water WA1 (see Figure 1) supplied from the tank 21 when washing laundry. The washing tub 13 is formed in a cylindrical shape with only one side open in the axial direction. That is, the washing tub 13 has a circular opening 13A (see Figure 2). As shown in Figure 2, the washing tub 13 is fixedly positioned inside the housing 11 with the opening 13A facing the opening 11A of the housing 11. A water inlet 13B is provided on the upper side of the washing tub 13. The water inlet 13B is connected to the water inlet 11B of the housing 11 via a water supply channel 16. The water inlet 13B is used to supply water to the washing tub 13. A drain outlet 13C is provided on the lower side of the washing tub 13. The drain outlet 13C is connected to the drain outlet 11C of the housing 11 via a drain channel 17. The drain outlet 13C is used to drain water from the washing tub 13.

[0020] The rotating drum 14 holds the laundry to be washed. The rotating drum 14 is formed in a cylindrical shape with only one side open in the axial direction. In other words, the rotating drum 14 has a circular opening 14A (see Figure 2). The radial size of the rotating drum 14 is smaller than that of the washing tub 13. As shown in Figure 2, the rotating drum 14 is positioned inside the washing tub 13 such that the opening 14A faces the opening 11A of the housing 11. The rotating drum 14 is also rotatable inside the washing tub 13 around its central axis (rotation axis). The side surface of the rotating drum 14 is provided with numerous water passages (not shown) for supplying the first alkaline ionized water WA1 stored in the washing tub 13 to the inside of the rotating drum 14.

[0021] The washing machine 1 is a so-called slanted drum type washing machine, in which the rotating drum 14 is positioned at an angle. Specifically, the rotating drum 14 is positioned such that its central axis is perpendicular to the inclined surface of the housing 11. The angle of inclination of the rotating drum 14 with respect to the horizontal plane is set within the range of 5 to 30 degrees, taking into consideration water-saving effect, washing power, susceptibility to damage to laundry, and ease of removing laundry after washing. Note that the washing machine 1 is not limited to the so-called slanted drum type, but may also be a so-called horizontal type washing machine in which the central axis of the rotating drum 14 is positioned horizontally.

[0022] The motor 15 supplies rotational driving force to the rotating drum 14. The rotating drum 14 rotates around the central axis in response to the rotational driving force supplied by the motor 15. As shown in Figure 3, the motor 15 is connected to the control unit 19 and is driven and controlled by the control unit 19.

[0023] The water supply channel 16 is a water channel from the water inlet 11B of the housing 11 to the water inlet 13B of the washing tub 13. As shown in Figure 2, a water supply valve 16A is provided in the water supply channel 16. The water supply valve 16A is a solenoid valve or electric valve that changes state between an open state that allows water to pass through and a closed state that prohibits water to pass through. As shown in Figure 3, the water supply valve 16A is connected to the control unit 19 and is driven and controlled by the control unit 19.

[0024] The drain channel 17 is a waterway from the drain port 13C of the washing tub 13 to the drain port 11C of the housing 11. As shown in Figure 2, the drain channel 17 is provided with a drain valve 17A and a drain filter 17B. The drain valve 17A is a solenoid valve or electric valve that changes state between an open state that allows water to pass through and a closed state that prohibits water to pass through. As shown in Figure 3, the drain valve 17A is connected to the control unit 19 and is driven and controlled by the control unit 19. The drain filter 17B captures foreign matter such as lint contained in the first alkaline ionized water WA1 that passes through the drain channel 17 after washing.

[0025] The operation display unit 18 (see Figure 3) is the user interface of the washing system 100. The operation display unit 18 comprises a display unit and an operation unit. The display unit displays various information in response to control instructions from the control unit 19. For example, the display unit is a flat panel display such as a liquid crystal display. The operation unit inputs various information to the control unit 19 in response to user operations. For example, the operation unit includes hard keys and a touch panel.

[0026] The control unit 19 (see Figure 3) comprehensively controls the washing system 100. As shown in Figure 3, the control unit 19 comprises a CPU 19A, ROM 19B, RAM 19C, and non-volatile memory 19D. The CPU 19A is a processor that performs various arithmetic operations. The ROM 19B is a non-volatile storage device in which information such as control programs for causing the CPU 19A to perform various operations is pre-stored; in other words, it is a storage medium that can be read by a computer. The RAM 19C is a volatile or non-volatile storage device used as a temporary storage memory (work area) for various operations performed by the CPU 19A. The non-volatile memory 19D is a non-volatile storage device used to maintain the settings of the washing system 100. The CPU 19A executes various control programs pre-stored in the ROM 19B. In this way, the CPU 19A comprehensively controls the washing system 100.

[0027] [Configuration of Water Circulation Device 2] Next, the configuration of the water circulation device 2 will be described with reference to Figures 1 and 3.

[0028] As shown in Figure 1, the water circulation device 2 includes a tank 21, a first water channel 22, a first pump 23, a second water channel 24, a third water channel 25, a first switching valve 26, a drainage channel 27, a fourth water channel 28, a second pump 29, a fifth water channel 30, a filter 31, a sixth water channel 32, an ionized water supply unit 33, and a neutral water supply unit 34, a first water supply channel 35, a second switching valve 36, a second water supply channel 37, and a third water supply channel 38. The water circulation device 2 also includes an operation display unit 39, a float sensor 40, and a pH sensor 41, as shown in Figure 3.

[0029] Tank 21 stores the first alkaline ionized water WA1 (see Figure 1).

[0030] In the washing system 100, the first alkaline ionized water WA1 stored in the tank 21 is supplied to the washing tub 13 (see Figure 2) of the washing machine 1. In addition, the first alkaline ionized water WA1 discharged from the washing tub 13 of the washing machine 1 and purified by the filter 31 (see Figure 1) is supplied to the tank 21. For example, the first alkaline ionized water WA1 is alkaline water with a pH value of 11.0 or less.

[0031] Tank 21 is sized to store the amount of first alkaline ionized water WA1 necessary for the washing operation of the washing machine 1. Tank 21 is located on the side, bottom, top, or inside of the washing machine 1.

[0032] As shown in Figure 1, the tank 21 is equipped with a first water inlet 21A, a drain port 21B, a first supply port 21C, a second supply port 21D, and a second water inlet 21E. The first water inlet 21A is used to supply the first alkaline ionized water WA1, which is discharged from the washing tub 13 (see Figure 2) of the washing machine 1 and purified by the filter 31, to the tank 21. The drain port 21B is used to discharge the first alkaline ionized water WA1 stored in the tank 21 to the washing tub 13. The drain port 21B leads to the washing tub 13 along the circulation path R1 (see Figure 1). The first supply port 21C is used to supply the second alkaline ionized water WA2 (see Figure 1) by the ionized water supply unit 33. The second supply port 21D is used to supply neutral water WA3 (see Figure 1) by the neutral water supply unit 34. The second water inlet 21E is used to supply tap water to the tank 21.

[0033] As shown in Figure 1, the first waterway 22 is a waterway from the drain port 21B of the tank 21 to the first pump 23. For example, the first waterway 22 is formed by a tubular member such as a resin hose.

[0034] The first pump 23 flows the first alkaline ionized water WA1 from the tank 21 side to the washing machine 1 side along a water supply path (see Figure 1) that goes from the drain port 21B of the tank 21 through the first water channel 22, the first pump 23, and the second water channel 24 to the water inlet 11B of the washing machine 1. As shown in Figure 3, the first pump 23 is connected to the control unit 19 and is driven and controlled by the control unit 19.

[0035] As shown in Figure 1, the second water channel 24 is a water channel from the first pump 23 to the water inlet 11B of the washing machine 1. For example, the second water channel 24 is formed by a tubular member such as a resin hose.

[0036] As shown in Figure 1, the third waterway 25 is a waterway from the drain port 11C of the washing machine 1 to the first switching valve 26. For example, the third waterway 25 is formed by a tubular member such as a resin hose.

[0037] As shown in Figure 1, the first switching valve 26 is connected to the third waterway 25, the drainage waterway 27, and the fourth waterway 28. The first switching valve 26 is a three-way valve that switches the waterway connected to the third waterway 25 between the drainage waterway 27 and the fourth waterway 28. The first switching valve 26 is also an electrically operated valve or a solenoid valve that operates in response to power supply. As shown in Figure 3, the first switching valve 26 is connected to the control unit 19 and is driven and controlled by the control unit 19. The first switching valve 26 may also be composed of two two-way valves provided in the drainage waterway 27 and the fourth waterway 28, respectively.

[0038] As shown in Figure 1, the drainage channel 27 is a waterway from the first switching valve 26 to the external outlet 27A (see Figure 1) (an example of an outlet in this disclosure). The external outlet 27A is used to discharge the first alkaline ionized water WA1 to the outside (for example, to a sewer). For example, the drainage channel 27 is formed by a tubular member such as a resin hose. If the drainage channel 27 is formed by a tubular member, the external outlet 27A may be at one end of the tubular member.

[0039] As shown in Figure 1, the fourth water channel 28 is a water channel from the first switching valve 26 to the second pump 29. For example, the fourth water channel 28 is formed by a tubular member such as a resin hose.

[0040] The second pump 29 causes the first alkaline ionized water WA1 to flow from the washing machine 1 side to the tank 21 side along a drainage path (see Figure 1) that goes from the drain port 11C of the washing machine 1 through the third water channel 25, the first switching valve 26, the fourth water channel 28, the second pump 29, the fifth water channel 30, the filter 31, and the sixth water channel 32 to the first water inlet 21A of the tank 21. As shown in Figure 3, the second pump 29 is connected to the control unit 19 and is driven and controlled by the control unit 19.

[0041] As shown in FIG. 1, the fifth water passage 30 is a water passage from the second pump 29 to the filter 31. For example, the fifth water passage 30 is formed of a tubular member such as a resin hose.

[0042] The filter 31 purifies the first alkaline ion water WA1 discharged from the washing tub 13 (see FIG. 2) of the washing machine 1. For example, the filter 31 is configured with a two-layer structure having a first layer composed of a non-woven fabric filter and a second layer composed of an activated carbon filter. The first layer is disposed upstream of the second layer in the flow direction of water in the drainage path. The second layer may be a hollow fiber membrane filter, a ceramic filter, a reverse osmosis membrane filter, an ion exchange resin filter, or the like. Further, the filter 31 may be configured with a single-layer structure or a multi-layer structure of three or more layers. When the filter 31 is configured with a multi-layer structure of three or more layers, the filter 31 may include a plurality of filters of different types.

[0043] As shown in FIG. 1, the sixth water passage 32 is a water passage from the filter 31 to the first water supply port 21A of the tank 21. For example, the sixth water passage 32 is formed of a tubular member such as a resin hose.

[0044] The tank 21, the first water passage 22, the first pump 23, the second water passage 24, the third water passage 25, the first switching valve 26, the fourth water passage 28, the second pump 29, the fifth water passage 30, the filter 31, and the sixth water passage 32 constitute a path forming portion 51 (see FIG. 1). The path forming portion 51 forms a circulation path R1 (see FIG. 1) of the first alkaline ion water WA1 passing through the filter 31, the tank 21, and the washing tub 13 (see FIG. 2) of the washing machine 1.

[0045] Specifically, the circulation path R1 is a path from the tank 21, passing through the first water passage 22, the first pump 23, and the second water passage 24, passing through the water supply path 16, the washing tub 13, and the drainage path 17 in the washing machine 1, and further passing through the third water passage 25, the first switching valve 26, the fourth water passage 28, the second pump 29, the fifth water passage 30, the filter 31, and the sixth water passage 32 to reach the tank 21.

[0046] In the circulation path R1, the first pump 23 and the second pump 29 cause the first alkaline ion water WA1 to flow along the circulation direction D1 shown in FIG. 1.

[0047] As shown in FIG. 1, the second pump 29 is provided on the downstream side of the washing tub 13 (see FIG. 2) of the washing machine 1 in the circulation path R1 in the circulation direction D1 and on the upstream side of the tank 21 in the circulation direction D1, and causes the first alkaline ion water WA1 to flow along the circulation direction D1.

[0048] As shown in FIG. 1, the drain passage 27 connects the upstream side of the circulation direction D1 of the second pump 29, which is downstream of the washing tub 13 (see FIG. 2) of the washing machine 1 in the circulation path R1, and the external discharge port 27A. The first switching valve 26 is provided at the connection portion between the circulation path R1 and the drain passage 27, and switches the flow destination of the first alkaline ion water WA1 between the second pump 29 and the external discharge port 27A. The first switching valve 26 is an example of the second valve of the present disclosure.

[0049] The ion water supply unit 33 supplies the second alkaline ion water WA2 (see FIG. 1) (an example of the specific substance of the present disclosure), which raises the pH value of the first alkaline ion water WA1 in the tank 21, to the tank 21. The second alkaline ion water WA2 is alkaline water having a higher pH value than the first alkaline ion water WA1. For example, the second alkaline ion water WA2 is alkaline water having a pH value of 12.5 or more. Note that the specific substance of the present disclosure may be a solid agent or the like that can raise the pH value of the first alkaline ion water WA1 in the tank 21. The ion water supply unit 33 is an example of the substance supply unit of the present disclosure.

[0050] As shown in Figure 1, the ionized water supply unit 33 comprises an ionized water storage unit 33A, an ionized water supply channel 33B, and an ionized water supply pump 33C. The ionized water storage unit 33A stores the second alkaline ionized water WA2. The ionized water supply channel 33B is a waterway from the ionized water storage unit 33A to the first supply port 21C of the tank 21. The ionized water supply pump 33C is installed in the ionized water storage unit 33A and is a submersible pump that flows the second alkaline ionized water WA2 from the ionized water storage unit 33A side to the tank 21 side along the ionized water supply channel 33B. The ionized water supply pump 33C is connected to the control unit 19 (see Figure 3) and is driven and controlled by the control unit 19.

[0051] In the washing system 100, the pH value of the first alkaline ionized water WA1 in the tank 21 gradually decreases as washing is repeated. In response to this, the washing system 100 uses an ionized water supply unit 33 to supply second alkaline ionized water WA2 to the tank 21. This makes it possible to keep the pH value of the first alkaline ionized water WA1 in the tank 21 within a certain range.

[0052] The neutral water supply unit 34 supplies neutral water WA3 (see Figure 1) to the tank 21. For example, the neutral water WA3 is tap water that has been supplied in advance and stored, for example, from a water tap 200, in preparation for emergencies. The neutral water WA3 may be rainwater, river water, lake water, or pond water, and it is preferable that it is water that has been purified in advance by a water purifier (not shown).

[0053] As shown in Figure 1, the neutral water supply unit 34 comprises a neutral water storage unit 34A, a neutral water supply channel 34B, and a neutral water supply pump 34C. The neutral water storage unit 34A stores neutral water WA3. The neutral water supply channel 34B is a waterway from the neutral water storage unit 34A to the second supply port 21D of the tank 21. The neutral water supply pump 34C is installed in the neutral water storage unit 34A and is a submersible pump that flows neutral water WA3 from the neutral water storage unit 34A side to the tank 21 side along the neutral water supply channel 34B. The neutral water supply pump 34C is connected to the control unit 19 (see Figure 3) and is driven and controlled by the control unit 19.

[0054] When laundry is washed in the washing machine 1, some of the first alkaline ionized water WA1 used for washing is absorbed by the laundry. As a result, in the washing system 100, the amount of first alkaline ionized water WA1 stored in the tank 21 gradually decreases as washing is repeated. In response to this, the washing system 100 uses a neutral water supply unit 34 to supply neutral water WA3 to the tank 21. This makes it possible to keep the amount of first alkaline ionized water WA1 stored in the tank 21 within a certain range.

[0055] Thus, the washing system 100 can reuse the first alkaline ionized water WA1 discharged from the washing machine 1. This makes it possible to meet the needs of users who wish to reuse the first alkaline ionized water WA1 discharged from the washing machine 1 in emergencies, such as during a disaster, when tap water is unavailable.

[0056] Incidentally, under normal circumstances, it is preferable to use tap water rather than reuse the first alkaline ionized water WA1 discharged from the washing machine 1. The wastewater discharged from the washing machine 1 contains dirt components and lint, which are filtered out by the filter 31. However, reusing the wastewater increases the frequency of cleaning and replacing the filter 31. Therefore, from the perspective of convenience and cost, it is sometimes better to generate fresh first alkaline ionized water WA1 by supplying tap water each time laundry is done. Herein, it is inconvenient for the user if the water circulation device 2 to the washing machine 1 has to be installed or removed each time the system switches between normal and emergency situations.

[0057] In contrast, the washing system 100 can reduce the burden of switching the water used for washing, as explained below.

[0058] As shown in Figure 1, the first water supply channel 35 is a water channel from the water tap 200 (see Figure 1) to the second switching valve 36. For example, the first water supply channel 35 is formed by a tubular member such as a resin hose.

[0059] As shown in Figure 1, the second switching valve 36 is connected to the first water supply channel 35, the second water supply channel 37, and the third water supply channel 38. The second switching valve 36 is a three-way valve capable of transitioning between a first state in which the tap water is shut off, a second state in which the tap water is guided to the tank 21 side via the second water supply channel 37, and a third state in which the tap water is guided to the washing tub 13 (see Figure 2) side of the washing machine 1 via the third water supply channel 38. The second switching valve 36 is also an electrically operated valve or a solenoid valve that operates in response to power supply. As shown in Figure 3, the second switching valve 36 is connected to the control unit 19 and is driven and controlled by the control unit 19. The second switching valve 36 may also be composed of two two-way valves provided in the second water supply channel 37 and the third water supply channel 38, respectively.

[0060] As shown in Figure 1, the second water supply channel 37 is a water channel from the second switching valve 36 to the second water inlet 21E of the tank 21. For example, the second water supply channel 37 is formed by a tubular member such as a resin hose.

[0061] As shown in Figure 1, the first water supply channel 35, the second switching valve 36, and the second water supply channel 37 connect the water tap 200 and the tank 21. The first water supply channel 35, the second switching valve 36, and the second water supply channel 37 are examples of the first water supply channels of this disclosure.

[0062] The second switching valve 36 can open and close the first water supply channel of this disclosure, which is formed by the first water supply channel 35, the second switching valve 36, and the second water supply channel 37. The second switching valve 36 is an example of the first valve of this disclosure.

[0063] As shown in Figure 1, the third water supply channel 38 is a water channel that extends from the second switching valve 36 to the middle of the second water channel 24. For example, the third water supply channel 38 is formed by a tubular member such as a resin hose. For example, in the washing system 100, the tubular member constituting the third water supply channel 38 and the two tubular members constituting the second water channel 24 are connected by a pipe fitting that opens in three directions.

[0064] As shown in Figure 1, the third water supply channel 38 connects the area downstream of the tank 21 in the circulation direction D1 and upstream of the washing tub 13 of the washing machine 1 (see Figure 2) in the circulation direction D1 to the middle of the first water supply channel of this disclosure, which is formed by the first water supply channel 35, the second switching valve 36, and the second water supply channel 37. The third water supply channel 38 is an example of the second water supply channel of this disclosure.

[0065] As shown in Figure 1, the third water supply channel 38 is provided with a check valve 38A to restrict the backflow of the first alkaline ionized water WA1, which flows along the second water channel 24 toward the washing machine 1, toward the second switching valve 36. Also, as shown in Figure 1, the second water channel 24 is provided with a check valve 24A to restrict the backflow of tap water, which flows along the third water supply channel 38 toward the washing machine 1, toward the first pump 23.

[0066] The operation display unit 39 is provided on the outer surface of the tank 21. For example, the operation display unit 39 is provided on the top or side surface of the tank 21. The operation display unit 39 is the user interface of the water circulation device 2. For example, the operation display unit 39 has the same configuration as the operation display unit 18 of the washing machine 1.

[0067] As shown in Figure 1, the float sensor 40 is installed inside the tank 21. The float sensor 40 detects the water level in the tank 21. As shown in Figure 3, the float sensor 40 is connected to the control unit 19. In response to instructions from the control unit 19, the float sensor 40 outputs a first detection signal to the control unit 19 indicating the water level in the tank 21 detected by the float sensor 40. Based on the first detection signal, the control unit 19 determines whether the water level in the tank 21 is above a predetermined reference position. The reference position is set based on the water level in the tank 21 when the tank 21 stores the minimum amount of first alkaline ionized water WA1 necessary for the washing operation by the washing machine 1.

[0068] As shown in Figure 1, the pH sensor 41 is installed inside the tank 21. The pH sensor 41 detects the pH value of the first alkaline ionized water WA1 stored in the tank 21. As shown in Figure 3, the pH sensor 41 is connected to the control unit 19. In response to instructions from the control unit 19, the pH sensor 41 inputs a second detection signal to the control unit 19 indicating the pH value of the first alkaline ionized water WA1 stored in the tank 21.

[0069] [Configuration of the control unit 19] Next, the configuration of the control unit 19 will be described with reference to Figures 1 and 3.

[0070] As shown in Figure 3, the control unit 19 includes a switching processing unit 61, a washing processing unit 62, and a water supply control unit 63.

[0071] Specifically, the ROM 19B of the control unit 19 contains pre-stored operation control programs for enabling the control unit 19 to function as each of the aforementioned functional units. The CPU 19A of the control unit 19 functions as each of the aforementioned functional units by reading and executing the operation control programs from the ROM 19B.

[0072] Furthermore, some or all of the functional units included in the control unit 19 may be composed of electronic circuits. Also, the operation control program may be a program that causes multiple processors to function as the functional units shown in Figure 3.

[0073] The switching processing unit 61 switches the water supply mode to the tank 21 between a first mode, which reuses the first alkaline ionized water WA1 discharged from the washing machine 1, and a second mode, which uses tap water each time. In the first mode, the first switching valve 26 guides the first alkaline ionized water WA1 toward the second pump 29. In the second mode, the first switching valve 26 guides the first alkaline ionized water WA1 toward the external outlet 27A.

[0074] Specifically, the switching processing unit 61 switches the water supply mode according to a predetermined switching operation. For example, the switching operation is a predetermined operation on the operation display unit 18 of the washing machine 1. Alternatively, the switching operation may be a predetermined operation on the operation display unit 39 of the water circulation device 2.

[0075] For example, in the washing system 100, water supply mode information indicating the current water supply mode is stored in a predetermined storage area in the non-volatile memory 19D.

[0076] The switching processing unit 61 switches the water supply mode by rewriting the water supply mode information stored in the non-volatile memory 19D.

[0077] The switching processing unit 61 may automatically switch the water supply mode from the second mode to the first mode when the supply of tap water from the water tap 200 is stopped. For example, the switching processing unit 61 can determine that the supply of tap water from the water tap 200 has stopped if the water level in the tank 21 does not rise or the pH value of the first alkaline ionized water WA1 does not decrease even after a predetermined time has elapsed since the start of the supply of tap water to the tank 21 using the second switching valve 36. The switching processing unit 61 may also automatically switch the water supply mode from the first mode to the second mode when the supply of tap water from the water tap 200 is resumed.

[0078] The washing processing unit 62 executes the washing process in response to user operations on the operation display unit 18 of the washing machine 1.

[0079] The aforementioned washing process includes a washing step, a rinsing step, and a dewatering step.

[0080] The washing process involves washing the laundry contained in the washing tub 13 using first alkaline ionized water WA1 supplied by the water circulation device 2. Specifically, in the washing process, a water supply valve 16A is used to supply a predetermined amount of first alkaline ionized water WA1 to the washing tub 13. In the washing process, a motor 15 is used to tumble the rotating drum 14, thereby beating and washing the laundry inside the rotating drum 14. In the washing process, a drain valve 17A is used to discharge the first alkaline ionized water WA1 from the washing tub 13. In the washing process, the supply of first alkaline ionized water WA1 to the washing tub 13, the beating and washing of the laundry, and the discharge of first alkaline ionized water WA1 from the washing tub 13 are repeated multiple times.

[0081] The rinsing process involves rinsing the laundry using first alkaline ionized water WA1 supplied by the water circulation device 2, or tap water. Specifically, in the rinsing process, a water supply valve 16A is used to supply a predetermined amount of first alkaline ionized water WA1 or tap water to the washing tub 13. In the rinsing process, a motor 15 is used to tumble the rotating drum 14, thereby rinsing the laundry inside the rotating drum 14. In the rinsing process, a drain valve 17A is used to discharge the first alkaline ionized water WA1 or tap water from the washing tub 13.

[0082] The dewatering step is a process of dewatering the laundry contained in the washing tub 13. Specifically, in the dewatering step, the motor 15 is used to rotate the rotating drum 14 at high speed, thereby applying centrifugal force to the laundry inside the rotating drum 14 and removing moisture from the laundry.

[0083] The water supply control unit 63 controls the water supply operation by the water circulation device 2 when the washing process is performed.

[0084] Specifically, when the water supply mode is the first mode, the water supply control unit 63 uses the first pump 23 to supply the first alkaline ionized water WA1 in the tank 21 to the washing machine 1 when the washing or rinsing step of the washing process is performed. In addition, the second switching valve 36 is set to a first state that shuts off the tap water.

[0085] Furthermore, when the water supply mode is the first mode, the water supply control unit 63 supplies the first alkaline ionized water WA1 discharged from the washing machine 1 to the tank 21 using the first switching valve 26 and the second pump 29 when the first alkaline ionized water WA1 is discharged from the washing machine 1 during the washing or rinsing process of the washing process. Note that the first switching valve 26 only needs to be switched from a state in which the drainage from the washing machine 1 can be guided to the external outlet 27A to a state in which the drainage can be guided to the tank 21 when the water supply mode is switched from the second mode to the first mode.

[0086] Furthermore, when the water supply mode is the first mode, the water supply control unit 63 replenishes the first alkaline ionized water WA1 in the tank 21 when the washing process is completed. Specifically, the water supply control unit 63 causes the ionized water supply unit 33 to supply the second alkaline ionized water WA2 and the neutral water supply unit 34 to supply the neutral water WA3.

[0087] Here, it is desirable that the supply of the second alkaline ionized water WA2 and neutral water WA3 to the tank 21 be carried out in the order of second alkaline ionized water WA2 and then neutral water WA3. This makes it possible to temporarily raise the pH value of the first alkaline ionized water WA1 in the tank 21, thereby disinfecting the inside of the tank 21.

[0088] Furthermore, the water supply control unit 63 may control the operation of the ionized water supply unit 33 based on the second detection signal input from the pH sensor 41. Also, the water supply control unit 63 may control the operation of the neutral water supply unit 34 based on the first detection signal input from the float sensor 40 and the second detection signal input from the pH sensor 41.

[0089] Furthermore, when the water supply mode is the second mode, the water supply control unit 63 uses the first pump 23 to supply the first alkaline ionized water WA1 in the tank 21 to the washing machine 1 when the washing step of the washing process is performed.

[0090] Furthermore, when the water supply mode is the second mode, the water supply control unit 63 sets the second switching valve 36 to the third state and supplies tap water to the washing machine 1 when the rinsing step of the washing process is performed.

[0091] Furthermore, when the water supply mode is the second mode, the water supply control unit 63 uses the first switching valve 26 to guide the water discharged from the washing machine 1 to the external outlet 27A when the first alkaline ionized water WA1 or tap water is discharged from the washing machine 1 during the washing or rinsing process of the washing process. Note that the first switching valve 26 only needs to be switched from a state in which it can guide the drainage from the washing machine 1 to the tank 21 side to a state in which it can guide the drainage to the external outlet 27A when the water supply mode is switched from the first mode to the second mode.

[0092] Furthermore, when the water supply mode is the second mode, the water supply control unit 63 replenishes the first alkaline ionized water WA1 in the tank 21 when the washing process is completed. Specifically, the water supply control unit 63 sets the second switching valve 36 to the second state to supply tap water to the tank 21 and causes the ionized water supply unit 33 to supply the second alkaline ionized water WA2. In this case as well, it is desirable that the supply of tap water and the second alkaline ionized water WA2 to the tank 21 be performed in the order of second alkaline ionized water WA2 and then tap water. The replenishment of the first alkaline ionized water WA1 in the tank 21 does not have to be performed at the time when the washing process is completed, but may be performed, for example, at the time when the next washing process is started. In this case, the amounts of tap water and second alkaline ionized water WA2 are adjusted in tank 21 to generate first alkaline ionized water WA1, which is then stored in tank 21. Once a predetermined amount of water has been stored in tank 21, the first pump 23 is used to supply the first alkaline ionized water WA1 from tank 21 to the washing machine 1.

[0093] [Operation Mode Switching Process] The operation mode switching method of the present disclosure will be described below with reference to Figure 4, along with an example of the procedure for the operation mode switching process performed by the control unit 19 in the washing system 100. Here, steps S11, S12... represent the numbers of the processing procedures (steps) performed by the control unit 19. The operation mode switching process is performed after the washing system 100 is started.

[0094] <Step S11> First, in step S11, the control unit 19 determines whether or not the timing for switching the water supply mode has arrived.

[0095] Specifically, the control unit 19 determines that the timing for switching the water supply mode has arrived when the switching operation is received by the operation display unit 18.

[0096] Here, if the control unit 19 determines that the timing for switching the water supply mode has arrived (Yes side of S11), it proceeds to step S12. If the timing for switching the water supply mode has not arrived (No side of S11), the control unit 19 waits in step S11 for the timing for switching the water supply mode to arrive.

[0097] <Step S12> In step S12, the control unit 19 switches the water supply mode. The processes in steps S11 and S12 are performed by the switching processing unit 61 of the control unit 19.

[0098] Specifically, the control unit 19 rewrites the water supply mode information stored in the non-volatile memory 19D from information indicating the water supply mode before switching to information indicating the water supply mode after switching.

[0099] [Water Supply Control Process] Next, with reference to Figure 5, an example of the procedure for the water supply control process performed by the control unit 19 in the washing system 100 will be described. The water supply control process is performed when an instruction to execute the washing process is input.

[0100] <Step S21> First, in step S21, the control unit 19 determines whether the current water supply mode is the first mode based on the water supply mode information stored in the non-volatile memory 19D.

[0101] If the control unit 19 determines that the current water supply mode is the first mode (Yes side of S21), it proceeds to step S22. If the current water supply mode is not the first mode (No side of S21), the control unit 19 proceeds to step S27.

[0102] <Step S22> In step S22, the control unit 19 circulates the first alkaline ionized water WA1 along the circulation path R1 (see Figure 1) while the washing process of the washing treatment is being executed.

[0103] Specifically, the control unit 19 uses the first pump 23 to supply the first alkaline ionized water WA1 in the tank 21 to the washing machine 1. The first alkaline ionized water WA1 supplied to the washing machine 1 by the first pump 23 is supplied to the washing tub 13 as needed by operating the water supply valve 16A.

[0104] Furthermore, when the washing process discharges the first alkaline ionized water WA1 from the washing machine 1, the control unit 19 uses the first switching valve 26 and the second pump 29 to supply the first alkaline ionized water WA1 discharged from the washing machine 1 to the tank 21.

[0105] <Step S23> In step S23, the control unit 19 determines whether the washing process has been completed.

[0106] If the control unit 19 determines that the washing process is complete (Yes side of S23), it proceeds to step S24. If the washing process is not complete (No side of S23), the control unit 19 waits in step S23 for the washing process to be completed.

[0107] <Step S24> In step S24, the control unit 19 circulates the first alkaline ionized water WA1 along the circulation path R1 (see Figure 1) while the rinsing process is being executed.

[0108] Specifically, the control unit 19 uses the first pump 23 to supply the first alkaline ionized water WA1 in the tank 21 to the washing machine 1. The first alkaline ionized water WA1 supplied to the washing machine 1 by the first pump 23 is supplied to the washing tub 13 as needed by operating the water supply valve 16A.

[0109] Furthermore, when the first alkaline ionized water WA1 is discharged from the washing machine 1 as a result of the rinsing process, the control unit 19 uses the first switching valve 26 and the second pump 29 to supply the first alkaline ionized water WA1 discharged from the washing machine 1 to the tank 21.

[0110] <Step S25> In step S25, the control unit 19 determines whether the washing process has been completed.

[0111] If the control unit 19 determines that the washing process is complete (Yes in S25), it proceeds to step S26. If the washing process is not complete (No in S25), the control unit 19 waits in step S25 for the washing process to finish.

[0112] <Step S26> In step S26, the control unit 19 replenishes the first alkaline ionized water WA1 in the tank 21.

[0113] Specifically, the control unit 19 causes the ionized water supply unit 33 to supply the second alkaline ionized water WA2, and then the neutral water supply unit 34 to supply the neutral water WA3. The supply of neutral water WA3 to the tank 21 may be performed in response to the input of the next instruction to execute the washing process.

[0114] <Step S27> In step S27, the control unit 19 causes the first alkaline ionized water WA1 to flow from the tank 21 through the washing tub 13 to the external outlet 27A (see Figure 1) during the execution of the washing process.

[0115] Specifically, the control unit 19 uses the first pump 23 to supply the first alkaline ionized water WA1 in the tank 21 to the washing machine 1. The first alkaline ionized water WA1 supplied to the washing machine 1 by the first pump 23 is supplied to the washing tub 13 as needed by operating the water supply valve 16A.

[0116] Furthermore, when the first alkaline ionized water WA1 is discharged from the washing machine 1 during the washing process, the control unit 19 uses the first switching valve 26 to guide the water discharged from the washing machine 1 to the external outlet 27A.

[0117] <Step S28> In step S28, the control unit 19 determines whether the washing process has been completed.

[0118] If the control unit 19 determines that the washing process is complete (Yes side of S28), it proceeds to step S29. If the washing process is not complete (No side of S28), the control unit 19 waits in step S28 for the washing process to be completed.

[0119] <Step S29> In step S29, the control unit 19 causes tap water to flow along a path from the water tap 200 through the washing tub 13 to the external outlet 27A (see Figure 1) during the execution of the rinsing process.

[0120] Specifically, the control unit 19 supplies tap water to the washing machine 1 using the second switching valve 36. The first alkaline ionized water WA1 supplied to the washing machine 1 by the second switching valve 36 is supplied to the washing tub 13 as needed by operating the water supply valve 16A.

[0121] Furthermore, when tap water is discharged from the washing machine 1 during the rinsing process, the control unit 19 uses the first switching valve 26 to guide the water discharged from the washing machine 1 to the external outlet 27A.

[0122] <Step S30> In step S30, the control unit 19 determines whether the washing process has been completed.

[0123] If the control unit 19 determines that the washing process is complete (Yes side of S30), it proceeds to step S31. If the washing process is not complete (No side of S30), the control unit 19 waits for the washing process to finish in step S30.

[0124] <Step S31> In step S31, the control unit 19 replenishes the first alkaline ionized water WA1 in the tank 21.

[0125] Specifically, the control unit 19 causes the ion water supply unit 33 to supply the second alkaline ion water WA2, and then uses the second switching valve 36 to supply tap water to the tank 21. The supply of tap water to the tank 21 may be performed in response to the input of the subsequent instruction to execute the washing process.

[0126] Thus, the washing system 100 can switch the water supply mode between a first mode, which reuses the first alkaline ionized water WA1 discharged from the washing machine 1 using the second pump 29, and a second mode, which uses tap water each time using the second switching valve 36. This makes it possible to switch the water used for washing between the first alkaline ionized water WA1 discharged from the washing machine 1 and tap water, even with the water circulation device 2 attached to the washing machine 1. In other words, it is possible to switch the water used for washing without having to install or remove the water circulation device 2 from the washing machine 1. Therefore, the burden of switching the water used for washing can be reduced.

[0127] Furthermore, the washing system 100 includes an ion water supply unit 33 that supplies second alkaline ion water WA2 to the tank 21. This makes it possible to generate and maintain first alkaline ion water WA1 with a pH value suitable for washing in advance within the tank 21. Therefore, compared to a configuration in which first alkaline ion water WA1 with a pH value suitable for washing is generated within the washing tub 13 or in the water channel from the tank 21 to the washing tub 13, variations in the pH value of the generated first alkaline ion water WA1 can be suppressed. In addition, even in the second mode, which is a water supply mode that uses tap water, the washing system 100 generates first alkaline ion water WA1 in the tank 21 for use in washing. As a result, even during normal use when tap water is used, first alkaline ion water WA1 with a predetermined pH value is supplied to the tank 21, so disinfection of the tank 21, first water channel 22, first pump 23, and second water channel 24 can be performed even during normal use. Since the tank 21 to the second water channel 24 is the route through which water is supplied for washing laundry, it is important to avoid the inside of the tank 21 to the second water channel 24 being dirty or moldy when switching to the first mode, which is a water supply mode that reuses the first alkaline ionized water WA1. With this washing system 100, at least the water supply route to the washing tub 13 can be used continuously even under normal circumstances, so the first alkaline ionized water WA1 can be used to disinfect and prevent the attachment of mold and other contaminants.

[0128] Furthermore, the washing system 100 can supply tap water directly from the faucet 200 to the washing tub 13. This makes it possible to rinse the laundry using tap water. In addition, it is possible to prevent the pH value of the walls of the tank 21 to the second water channel 24 from decreasing due to the flow of tap water.

[0129] Furthermore, the washing system 100 includes a first switching valve 26 and a drain channel 27. This eliminates the need to attach or detach the tubular member to the second pump 29 each time the supply mode is switched, compared to a configuration that does not include the first switching valve 26 and the drain channel 27, where one end of the tubular member constituting the third water channel 25 is connected to the second pump 29. In other words, the burden of switching the water used for washing can be further reduced.

[0130] [Modification] The washing system 100 does not necessarily have to be equipped with a first switching valve 26 and a drain channel 27. In this case, the switching operation may be the operation of attaching or detaching a tubular member constituting the third water channel 25 to the second pump 29.

[0131] Furthermore, the washing system 100 does not necessarily have to be equipped with a third water supply channel 38. In this case, the water used in the rinsing step may be the first alkaline ionized water WA1.

[0132] Furthermore, the switching processing unit 61 and the water supply control unit 63 may be provided in the water circulation device 2 instead of the washing machine 1. In other words, the water circulation device 2 may include control units that function as the switching processing unit 61 and the water supply control unit 63.

[0133] Furthermore, washing machine 1 is not limited to so-called drum-type washing machines, but may also be a so-called top-loading washing machine.

[0134] [Addendum to the Invention] The following is an outline of the invention extracted from the above-described embodiments. Note that each configuration and processing function described in the following addendum can be selected and combined as desired.

[0135] <Note 1> A water circulation system comprising: a tank for storing water supplied to the washing tub of a washing machine; a filter for purifying the water discharged from the washing tub; a path forming unit for forming a water circulation path through the tank, the washing tub, and the filter; a pump provided downstream of the washing tub in the water circulation direction and upstream of the tank in the circulation direction in the circulation path, for causing the water to flow along the circulation direction; a first water supply channel connecting a water tap and the tank; a first valve capable of opening and closing the first water supply channel; and a switching processing unit for switching the water supply mode to the tank between a first mode using the pump and a second mode using the first valve.

[0136] <Note 2> The water circulation system according to Note 1, further comprising a substance supply unit that supplies a specific substance to the tank that increases the pH value of the water in the tank.

[0137] <Note 3> The water circulation system according to Note 2, comprising a second water supply channel connecting the part of the first water supply channel to the part downstream of the tank in the circulation direction and upstream of the washing tub in the circulation direction in the circulation path, wherein the first valve is provided at the connection between the first water supply channel and the second water supply channel and transitions between a first state of shutting off the water, a second state of guiding the water toward the tank, and a third state of guiding the water toward the washing tub.

[0138] <Note 4> A water circulation system according to any one of Notes 1 to 3, comprising: a drainage channel connecting a downstream side of the washing tub in the circulation direction in the circulation path and an upstream side of the pump in the circulation direction in the circulation path to an outlet used for discharging the water to the outside; and a second valve provided at the connection between the circulation path and the drainage channel, which switches the destination of the water flow between the pump and the outlet, wherein in the first mode, the second valve is used to guide the water toward the pump, and in the second mode, the second valve is used to guide the water toward the outlet.

[0139] <Note 5> The water circulation system according to any one of Notes 1 to 4, wherein the switching processing unit switches the water supply mode according to a predetermined switching operation.

[0140] <Note 6> An operating mode switching method performed in a water circulation system comprising: a tank for storing water supplied to the washing tub of a washing machine; a filter for purifying the water discharged from the washing tub; a path forming unit for forming a water circulation path through the tank, the washing tub, and the filter; a pump provided downstream of the washing tub in the water circulation direction in the circulation path and upstream of the tank in the circulation direction, for causing the water to flow along the circulation direction; a first water supply channel connecting a water tap and the tank; and a first valve capable of opening and closing the first water supply channel, wherein the operating mode switching method switches the water supply mode to the tank between a first mode using the pump and a second mode using the first valve.

Claims

1. A water circulation system comprising: a tank for storing water supplied to the washing tub of a washing machine; a filter for purifying the water discharged from the washing tub; a path forming unit for forming a water circulation path through the tank, the washing tub, and the filter; a pump provided downstream of the washing tub in the water circulation direction and upstream of the tank in the circulation direction in the circulation path for causing the water to flow along the circulation direction; a first water supply channel connecting a water tap and the tank; a first valve capable of opening and closing the first water supply channel; and a switching processing unit for switching the water supply mode to the tank between a first mode using the pump and a second mode using the first valve.

2. The water circulation system according to claim 1, further comprising a substance supply unit that supplies a specific substance to the tank that increases the pH value of the water in the tank.

3. The water circulation system according to claim 2, comprising a second water supply channel connecting the part of the first water supply channel to the part downstream of the tank in the circulation direction and upstream of the washing tub in the circulation direction in the circulation path, wherein the first valve is provided at the connection between the first water supply channel and the second water supply channel and transitions between a first state of shutting off the water, a second state of guiding the water toward the tank, and a third state of guiding the water toward the washing tub.

4. A water circulation system according to claim 1 or 2, comprising: a drainage channel connecting a downstream side of the washing tub in the circulation direction in the circulation path and an upstream side of the pump in the circulation direction in the circulation path to an outlet used for discharging the water to the outside; and a second valve provided at the connection between the circulation path and the drainage channel, which switches the destination of the water flow between the pump and the outlet, wherein in the first mode, the second valve is used to guide the water toward the pump, and in the second mode, the second valve is used to guide the water toward the outlet.

5. The water circulation system according to claim 1 or 2, wherein the switching processing unit switches the water supply mode according to a predetermined switching operation.

6. An operating mode switching method performed in a water circulation system comprising: a tank for storing water supplied to the washing tub of a washing machine; a filter for purifying the water discharged from the washing tub; a path forming unit for forming a water circulation path through the tank, the washing tub, and the filter; a pump provided downstream of the washing tub in the water circulation direction in the circulation path and upstream of the tank in the circulation direction, for causing the water to flow along the circulation direction; a first water supply channel connecting a water tap to the tank; and a first valve capable of opening and closing the first water supply channel, wherein the operating mode switching method switches the water supply mode to the tank between a first mode using the pump and a second mode using the first valve.

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