Disinfection method for washing machines and their outer tubs

Abstract

To provide a washing machine with improved performance for sterilizing mold spores in an outer tank.SOLUTION: A washing machine of the present disclosure comprises a washing tank to accommodate laundry, an outer tank in which the washing tank is rotatably installed, a motor that rotates the washing tank, functional particle supply means that supplies functional particles into the outer tank, and control means that controls movements of the motor and the functional particle supply means. The control means executes a tank cleaning course having a sterilizing step of activating the motor and the functional particle supply means and a drying step of activating the motor before the sterilizing step.SELECTED DRAWING: Figure 6

Description

Technical Field

[0001] The present disclosure relates to a washing machine.

Background Art

[0002] For example, Patent Document 1 discloses a washing machine that realizes sterilization and suppression of mold growth in a tub without relying on chemicals or heating.

[0003] The washing machine described in Patent Document 1 includes an electrostatic atomization generating means for supplying electrostatic atomization generated particles, a washing tub for accommodating laundry, an outer tub in which the washing tub is rotatably installed, and a blower. By blowing air by the blower, the electrostatic atomization generated particles are supplied to the washing tub and the outer tub.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the washing machine described in Patent Document 1, there is still room for improvement in terms of improving the sterilization performance of mold spores in the outer tub.

[0006] Therefore, an object of the present disclosure is to solve the above problems and provide a washing machine that improves the sterilization performance of mold spores in the outer tub.

Means for Solving the Problems

[0007] A washing machine according to one aspect of the present disclosure comprises a washing tub for containing laundry, an outer tub rotatably housing the washing tub, a motor for rotating the washing tub, a functional particle supply means for supplying functional particles into the outer tub, and a control means for controlling the operation of the motor and the functional particle supply means, wherein the control means executes a tub cleaning course, and the tub cleaning course comprises a sterilization step for operating the motor and the functional particle supply means, and a drying step for operating the motor before the sterilization step.

[0008] A method for disinfecting the outer tub of a washing machine according to one aspect of the present disclosure is a method for disinfecting the outer tub of a washing machine, which comprises a washing tub for containing laundry and an outer tub rotatably housing the washing tub, the method comprising: a disinfection step in which a control means for controlling the operation of the washing machine operates a motor for rotating the washing tub and a functional particle supply means for supplying functional particles into the outer tub; and a drying step in which the control means operates the motor before the disinfection step. [Effects of the Invention]

[0009] According to this disclosure, it is possible to provide a washing machine that improves the sterilization performance of mold spores in the outer tub. [Brief explanation of the drawing]

[0010] [Figure 1] External perspective view of a washing machine and dryer in Embodiment 1 of the present disclosure [Figure 2] Longitudinal cross-section of a washer-dryer [Figure 3] Cross-sectional view of a washer-dryer [Figure 4] Block circuit diagram of a washing machine and dryer [Figure 5] Washer-dryer process diagram [Figure 6] Washer-dryer operation diagram [Figure 7] A vertical cross-sectional view of a washer-dryer showing the airflow caused by the rotation of the washing tub. [Figure 8A] Schematic diagram of mold spores attached to the outer tank before drying. [Figure 8B] Schematic diagram of mold spores attached to the outer tank after drying. [Figure 9]Diagram illustrating the delivery efficiency of functional particles in the outer tub of a washing machine / dryer. [Modes for carrying out the invention]

[0011] (Knowledge and other information that formed the basis of this disclosure) At the time the inventors conceived this disclosure, there were problems such as mold adhering to clothes after washing and a musty smell when opening the washing machine lid, and there was a growing need to suppress mold growth in washing machines. Among these, washer-dryers with drying capabilities have a highly airtight structure to improve drying efficiency from the perspective of energy saving and time saving. For this reason, washer-dryers are more likely to meet the conditions for mold growth, such as water, temperature, nutrients, and oxygen, than washing machines. In washing machines, mold is more likely to grow in the outer tub outside the washing tub than inside the washing tub. Specifically, during the spin-drying cycle, some of the water that moves from the washing tub to the outer tub by centrifugal force remains in the outer tub even after the cycle is finished. The gap between the washing tub and the outer tub is narrow, and the structure (labyrinth shape, etc.) makes it difficult for air to enter between the washing tub and the outer tub in order to ensure drying performance. When the drying cycle is performed, the temperature temporarily rises, but as the temperature decreases, the humidity rises. Therefore, a high-humidity environment is easily maintained in the space between the washing tub and the outer tub.

[0012] Therefore, to prevent mold growth, it is effective to disinfect mold spores on a daily basis. Mold mainly grows by repeating a cycle of spores and hyphae. Let's explain the mechanism of mold growth in washing machines. First, mold spores that enter the washing machine through laundry or the air in the space where the machine is installed settle in the washing machine tub or outer tub. These mold spores begin to grow when the conditions of water, temperature, and nutrients are met. Specifically, spore germination and hyphae growth occur, and finally, mycelium is formed. Mycelium has the ability to produce new spores, and once mycelium is formed, spores continue to be dispersed into the washing machine tub or outer tub, causing accelerated contamination. It should be noted that mold can only be visually detected when this mycelium has formed.

[0013] The means to prevent the formation of this mycelium is to sterilize the mold spores. For example, sterilization by regularly washing the tank with hot water or sterilization by regularly washing the tank with chemicals such as chlorine agents is carried out. The means of using hot water has problems such as an increase in the amount of water used and operating noise. In addition, the means of using chemicals has a cost problem. Therefore, it is difficult to use the above means frequently. Furthermore, it is difficult to sterilize mold spores with the heat generated by the drying operation.

[0014] Therefore, there is a technology called a tank clean course that operates at the end of the washing operation to suppress mold growth. This technology is a course that suppresses mold in the washing tub and the outer tub using electrostatic atomization generated particles only by the operation of the blowing means and the electrostatic atomization generating means. As a feature, since it does not use chemicals or heat, the running cost is low and it can be operated every time after washing. However, when using the blowing means, most of the electrostatic atomization generated particles that flow into the washing tub by riding on the wind are only supplied into the washing tub, and it becomes difficult to deliver them to the outer tub where mold is likely to occur.

[0015] Therefore, the present disclosure provides a washing machine that can generate an air flow by rotating the washing tub in the tank clean course and deliver functional particles, so that they can be delivered to the wall surface of the outer tub where mold is likely to occur.

[0016] Hereinafter, embodiments will be described in detail with reference to the drawings. However, a more detailed description may be omitted as necessary. For example, a detailed description of well-known matters or a redundant description of substantially the same configuration may be omitted. This is to avoid making the following description overly redundant and to facilitate the understanding of those skilled in the art.

[0017] Note that the accompanying drawings and the following description are provided for those skilled in the art to fully understand the present disclosure, and are not intended to limit the subject matter described in the claims. <>

[0018] (Embodiment) A washing machine according to an embodiment of the present disclosure will be described.

[0019] [Overall structure] Figure 1 is an external perspective view of a washing machine and dryer in Embodiment 1 of the present disclosure. Figure 2 is a longitudinal cross-sectional view of the washing machine and dryer 1. Figure 3 is a transverse cross-sectional view of the washing machine and dryer 1. Figure 4 is a block circuit diagram of the washing machine and dryer 1.

[0020] The washer-dryer 1 of this embodiment is a washing machine with a drying function (a so-called drum-type washer-dryer). As shown in Figures 1 to 4, the washer-dryer 1 comprises a housing 6, an outer tub 8, a washing tub 2, a motor 14, a heat pump unit 10, an air supply path 23, a water supply valve 30, a drain valve 31, a functional particle supply means 3, a control means 25, and an operation display unit 5.

[0021] <Enclosure> As shown in Figure 1, the housing 6 is a component that forms the exterior of the washing machine 1. The front of the housing 6 is provided with an opening 6a and a door 4 that can be opened and closed to cover the opening 6a.

[0022] <Outer tank> As shown in Figure 2, the outer tub 8 is a roughly cylindrical member located inside the housing 6 and has the function of holding washing water. The outer tub 8 has an opening facing the opening 6a of the housing 6 and is sealed and connected to the opening 6a of the housing 6. The outer tub 8 is further provided with a number of openings 33, 34 and a drain port 35. The openings 33, 34 are connected to the air supply path 23, and the drain port 35 drains the water from the outer tub 8 to the outside. The openings 33, 34 are located at the top of the outer tub 8, and the drain port 35 is located at the bottom of the outer tub 8.

[0023] As shown in Figure 3, a downward-facing recess 39 is formed on the circumferential surface of the outer tub 8 above the drain port 35. The recess 39 communicates with the drain port 35 downstream and with the washing tub 2 upstream through an opening 38 formed on the circumferential surface of the outer tub 8. Water flowing into the recess 39 from the opening 38 is ultimately discharged from the drain port 35. The area above the recess 39 is partially covered by a water-stopping rib 37, which partially opens up as an opening 38. The water-stopping rib 37 is a member that protrudes from the inner wall surface of the outer tub 8 in the circumferential direction of the outer tub 8. Specifically, the water-stopping rib 37 covers the downstream side (left side in Figure 3) above the recess 39 during spin-drying rotation. With this configuration, the water-stopping rib 37 can suppress water flowing into the recess 39 during spin-drying from splashing upward downstream and guide it to flow to the drain port 35. Alternatively, a part of the water-stopping rib 37 may be cut out to form an opening 38.

[0024] <Washing machine drum> Returning to Figure 2, the washing tub 2 is a roughly cylindrical member that is rotatably mounted inside the outer tub 8 and contains laundry such as clothes. Numerous through holes 2a are formed in the washing tub 2. The through holes 2a connect the washing tub 2 and the outer tub 8, allowing water and air to move between the washing tub 2 and the outer tub 8. The washing tub 2 also has an opening at a position facing the opening 6a of the housing 6.

[0025] <motor> Motor 14 is a component that rotates the washing tub 2. Motor 14 rotates the washing tub 2 in both forward and reverse directions. In this embodiment, motor 14 is a belt-type motor that acts on the washing tub 2 via a pulley. Therefore, the rotational speed of motor 14 and the rotational speed of the washing tub 2 may differ. On the other hand, motor 14 may be of other types, such as a direct-drive motor.

[0026] <Heat pump unit> The heat pump unit 10 is located in the airflow path 23 and is a device for dehumidifying and heating the air flowing through the airflow path 23. The heat pump unit 10 is located at the top of the housing 6.

[0027] The heat pump unit 10 includes, for example, a compressor, a throttling mechanism, a heat exchanger for heating, a heat exchanger for dehumidification, and refrigerant piping.

[0028] <Airflow path> The airflow path 23 is located inside the housing 6 and is a passage for circulating air between the outer tank 8 and the heat pump unit 10. The airflow path 23 is a generally sealed system. One end of the airflow path 23 is connected to the opening 33 of the outer tank 8, and the other end of the airflow path 23 is connected to the opening 34 of the outer tank 8. In this embodiment, the opening 34 is located on the rear of the outer tank 8. The opening 34 may also be located on the front side of the outer tank 8 or on the circumferential surface of the outer tank 8. Similarly, the opening 33 may be located on the front side of the outer tank 8, the rear side of the outer tank 8, or at the bottom of the outer tank 8.

[0029] <Air blower fan> The blower fan 11 is a mechanism such as a fan that generates airflow in the airflow path 23. The blower fan 11 generates airflow that circulates in the airflow path 23 (see arrow F). The blower fan 11 is rotationally driven by the blower fan motor 13.

[0030] <Water supply valve> The water supply valve 30 is a valve for supplying water to the outer tank 8. The water supply valve 30 is located on the upper part of the housing 6.

[0031] <Drain valve> The drain valve 31 is a valve for selectively draining water stored in the outer tank 8 through the drain port 35 of the outer tank 8. The drain valve 31 is located at the bottom of the housing 6.

[0032] <Functional particle supply means> The functional particle supply means 3 is a device that supplies functional particles. The functional particle supply means 3 is located downstream of the blower fan 11 in the airflow path 23. The functional particle supply means 3 delivers functional particles to the outer tub 8 and the washing tub 2 through the airflow path 23.

[0033] In this specification, functional particles are particles that can disinfect or suppress bacteria, viruses, pollen, etc. Functional particles may include substances such as charged water particles, ions, and ozone. Functional particles can disinfect mold spores attached to the walls of the outer tub 8. Specifically, functional particles can disinfect mold spores attached to the walls of the outer tub 8 by being delivered to the walls of the outer tub 8 by the airflow. Furthermore, functional particles can disinfect mold spores attached to the walls of the washing tub 2 and the clothes placed in the washing tub 2.

[0034] In this embodiment, an electrostatic atomizer is used as the functional particle supply means 3 to generate charged water microparticles as functional particles. Charged water microparticles have a longer lifespan among functional particles. Therefore, more functional particles that maintain their antibacterial function (i.e., have not been deactivated) can be delivered to the wall surface of the outer tub 8. Consequently, the antibacterial performance of mold spores can be improved in the washing machine 1.

[0035] Alternatively, ions may be used as functional particles, and an ion generator may be used as the functional particle supply means 3. Alternatively, ozone may be used as functional particles, and an ozone generator may be used as the functional particle supply means 3.

[0036] <Control means> The control means 25 is a component that controls the operation of the washing machine 1. The control means 25 may, for example, include a memory (not shown) that stores a program and a processing circuit (not shown) corresponding to a processor such as a CPU, and the processor may function as these elements by executing the program.

[0037] As shown in Figure 4, the control means 25 controls the components of the washing machine / dryer 1, such as the motor 14, the water supply valve 30, the drain valve 31, the heat pump unit 10, the functional particle supply means 3, and the blower fan motor 13, based on information input through the operation display unit 5.

[0038] <Operation display section> The operation display unit 5 is a mechanism that can be operated by the user of the washing machine / dryer 1. The operation display unit 5 is located on the top of the housing 6, and input is received from the input setting means (not shown) of the operation display unit 5. Based on the input information, the display means (not shown) displays the information to the user.

[0039] [Operation] In the configuration described above, an example of the operation of the washing machine 1 when performing the drum cleaning course will be explained with reference to Figures 5 and 6. Figure 5 is a process diagram of the washing operation and drum cleaning course performed by the washing machine 1. Figure 6 is an operation diagram of the washing operation and drum cleaning course performed by the washing machine 1.

[0040] The user selects the desired laundry processing course through the operation display unit 5. For example, the user selects a laundry processing course that combines a wash cycle and a drum cleaning course.

[0041] When the above laundry processing course is selected, the control means 25 sequentially executes the washing operation and the drum cleaning course. As shown in Figure 5, the control means 25 executes the washing operation, and after the washing operation is completed, it executes the drum cleaning course.

[0042] The control means 25 starts the washing operation after the user places the laundry in the washing tub 2 and closes the door 4. The washing operation includes a washing process, a rinsing process, and a spin-drying process. The control means 25 executes the washing process, rinsing process, and spin-drying process in order. In the washing process, detergent is added to the washing tub 2, water is supplied, and the washing tub 2 is rotated by the motor 14 to wash the laundry. In the rinsing process, water is supplied, and the washing tub 2 is rotated to rinse the laundry. In the spin-drying process, the washing water is drained to the outside of the housing 6, and then the washing tub 2 is rotated at high speed to spin-dry the laundry. Alternatively, instead of the washing operation, the spin-drying process may be executed alone, or in combination with other processes. Performing the spin-drying process prevents the tub cleaning course from being executed while there is water in the washing tub 2.

[0043] Subsequently, the control means 25 terminates the washing operation.

[0044] When the washing cycle is finished, the control unit 25 automatically transitions to the drum cleaning course. When the machine automatically transitions to the drum cleaning course, the washer-dryer 1 enters a drum cleaning course standby state. In the drum cleaning course standby state, the user opens the door 4, removes the laundry from the washing tub 2, and closes the door 4.

[0045] Subsequently, the control means 25 starts the tank cleaning course. Alternatively, the control means 25 may operate the tank cleaning course as an individual course.

[0046] The tank cleaning course includes a drying step and a sterilization step. The control means 25 executes the drying step and the sterilization step in sequence. The drying step is performed to remove residual water in the outer tank 8 after the dewatering step. The sterilization step is performed to deliver functional particles to the wall surface of the outer tank 8.

[0047] First, the control means 25 executes the drying process. As shown in Figure 5, during the drying process, the control means 25 operates the motor 14 and the blower fan 11. On the other hand, the control means 25 does not operate the functional particle supply means 3.

[0048] During the drying process, the washing tub 2 rotates when the motor 14 is operated. When the washing tub 2 rotates, an airflow is generated in the airflow path 23. Here, with reference to Figures 2 and 7, the airflow due to the rotation of the washing tub 2 will be explained in comparison with the airflow due to the blower fan 11. Figure 7 is a longitudinal cross-sectional view of the washer-dryer 1 showing the airflow due to the rotation of the washing tub 2.

[0049] As shown in Figure 2, when the blower fan 11 rotates with the washing tub 2 stationary, air flows into the washing tub 2 from the opening 34, passes over the top of the washing tub 2, and flows out from the opening 33 (arrow F). Therefore, air does not easily flow throughout the entire region R1 between the washing tub 2 and the outer tub 8. On the other hand, as shown in Figure 7, when the washing tub 2 rotates, centrifugal force acts on the air inside the washing tub 2, causing the air to flow out through the through-hole 2a towards the outer tub 8 on the outside of the washing tub 2 (arrow C). Because the air flows out due to centrifugal force, air also flows to the region R1 away from the opening 34. In other words, the rotation of the washing tub 2 makes it easier for air to flow throughout the entire region R1 and to hit the wall surfaces that make up region R1 (for example, the wall surface of the outer tub 8). Therefore, the rotation of the washing tub 2 allows the wall surfaces that make up region R1 to be dried efficiently.

[0050] When air flows out of the washing tub 2, a negative pressure is created in the washing tub 2, and air flows into the washing tub 2 from the air supply path 23. In this way, the rotation of the washing tub 2 generates a flow of circulating air through the air supply path 23.

[0051] By further operating the blower fan 11, the airflow in the airflow path 23 can be further promoted.

[0052] Returning to Figures 5 and 6, the drying process more specifically comprises a room temperature air blowing process and a heated air blowing process. The room temperature air blowing process and the heated air blowing process differ in terms of the ON / OFF status of the heat pump unit 10.

[0053] The ambient temperature air supply process corresponds to the start-up time of the heat pump unit 10. The heat pump unit 10 requires a start-up time before it turns ON. This is because, if the ambient temperature is low, the heat pump unit 10 may not be able to perform as intended. During the start-up time, for example, the compressor of the heat pump unit 10 is rotated at a low speed or only energized to raise the refrigerant temperature to above a predetermined temperature. This allows the heat pump unit 10 to perform as intended. As shown in Figure 6, during the ambient temperature air supply process, the control means 25 operates the blower fan 11 and the motor 14. In other words, the control means 25 operates the blower fan 11 and the motor 14 during the start-up time of the heat pump unit 10. On the other hand, the control means 25 does not operate the functional particle supply means 3 and the heat pump unit 10. However, the functional particle supply means 3 may be operated.

[0054] Next, in the heating and blowing process, the control means 25 operates the heat pump unit 10, the blower fan 11, and the motor 14. On the other hand, the control means 25 does not operate the functional particle supply means 3.

[0055] When the heat pump unit 10 is operated, the blower fan 11 is also operated simultaneously. The blower fan 11 promotes air circulation in order to cool and heat the air that flows out of the washing tub 2 into the airflow path 23, and then return it to the washing tub 2.

[0056] In other words, during the drying process, the control means 25 delays the start of operation of the heat pump unit 10 compared to the start of operation of the blower fan 11 and the motor 14. That is, during the drying process, there is a waiting period between the start of operation of the blower fan 11 and the start of operation of the heat pump unit 10, during which the heat pump unit 10 is not operating and is waiting.

[0057] The ambient temperature air blowing process is shorter than the heated air blowing process. Specifically, the ambient temperature air blowing process takes 3 minutes, and the heated air blowing process takes 27 minutes. Therefore, the total drying time is 30 minutes. On the other hand, the times for the ambient temperature air blowing process and the heated air blowing process may be arbitrarily set predetermined times.

[0058] In this embodiment, during the drying process, the control means 25 operates the blower fan 11 and the motor 14 continuously. As will be described later (see Figure 9), the rotation of the motor 14, i.e., the rotation of the washing tub 2, guides the air inside the washing tub 2 to the outer tub 8. This continuous operation allows air to be continuously delivered to the outer tub 8. Therefore, compared to the case where the motor 14 is driven intermittently, residual water in the outer tub 8 can be removed in a shorter time.

[0059] Furthermore, by immediately moving to the sterilization process after the drying process, it is possible to suppress the drop in temperature and the rise in humidity. Therefore, it is possible to maintain a state where residual water around the mold spores in the outer tank 8 has been removed.

[0060] By removing residual water from the outer tank 8 and maintaining this state, the amount of functional particles that collide with the residual water and become inactive during the subsequent sterilization process can be reduced.

[0061] Figure 8A is a schematic diagram of mold spores V1 attached to the outer tank 8 before drying. Figure 8B is a schematic diagram of mold spores V1 attached to the outer tank 8 after drying.

[0062] As shown in Figure 8A, before the drying process, the mold spores V1 attached to the outer tank 8 are covered with water droplets W1. Therefore, the functional particles collide with the water droplets W1 instead of the mold spores V1 and become inactive before reaching the mold spores V1. As shown in Figure 8B, after the drying process, the water droplets W1 in the outer tank 8 have become smaller. Therefore, the functional particles can avoid collision with the water droplets W1 and reach the mold spores V1 while maintaining their disinfecting function (i.e., not inactive). The functional particles can then act directly on the mold spores V1.

[0063] Next, the control means 25 executes the sterilization process. In the sterilization process, the control means 25 operates the motor 14 and the functional particle supply means 3. The control means 25 maintains the rotation direction and rotation speed of the motor 14 that is operating in the drying process, i.e., the rotation direction and rotation speed of the washing tub 2, and operates the motor 14 continuously. Meanwhile, the control means 25 stops the blower fan 11 and the heat pump unit 10.

[0064] During the sterilization process, the motor 14 and the functional particle supply means 3 are in operation, so the airflow caused by the rotation of the motor 14 (i.e., the washing tub 2) contains functional particles. As the functional particles are carried out with the air by centrifugal force, they also flow into the region R1 away from the opening 34 (see arrow C in Figure 7). In other words, the rotation of the washing tub 2 makes it easier for the functional particles to flow throughout the entire region R1, and they are more likely to come into contact with the wall surfaces that make up region R1 (for example, the wall surface of the outer tub 8). Therefore, the rotation of the washing tub 2 allows for efficient sterilization of the wall surfaces that make up region R1.

[0065] During the sterilization process, the control means 25 stops the blower fan 11. When the blower fan 11 is operating, the pressure difference created by the operation of the blower fan 11 causes the air that flows from the airflow path 23 through the opening 34 into the outer tub 8 to preferentially pass through the washing tub 2 and flow out from the opening 33. The air is less likely to hit the walls of the outer tub 8 at positions far from the openings 33 and 34. As a result, functional particles are also less likely to hit the walls of the outer tub 8.

[0066] Furthermore, the amount of air blown by the blower fan 11 is greater than the amount of air blown by the rotation of the washing tub 2. When the blower fan 11 is operating, the number of functional particles that collide with the walls of the airflow path 23 and become inactive increases. As a result, the number of functional particles that maintain their antibacterial function decreases.

[0067] Therefore, by stopping the blower fan 11, more functional particles that maintain their sterilization function can be delivered to the wall surface of the outer tank 8. In addition, by stopping the blower fan 11, the operating noise of the sterilization process can be kept low.

[0068] During the sterilization process, the control means 25 stops the heat pump unit 10. When the heat pump unit 10 is operating, the air in the airflow path 23 is heated. The heating of the air increases the entropy of the functional particles. As a result, the functional particles become more likely to be deactivated before being delivered to the outer tank 8.

[0069] Therefore, by stopping the heat pump unit 10, more functional particles that maintain their antibacterial function can be delivered to the wall surface of the outer tub 8. In addition, by stopping the heat pump unit 10, energy consumption of the washing and drying machine 1 during the tub cleaning course can be saved.

[0070] In this embodiment, during the sterilization process, the rotation direction of the washing tub 2 is unidirectional. This operation suppresses the reversal of the motor 14 and prevents the motor 14 from decelerating. By suppressing the deceleration of the motor 14, the airflow toward the outer tub 8 can be maintained, and more functional particles can be delivered to the wall surface of the outer tub 8. On the other hand, the rotation direction of the washing tub 2 may be reversed. This operation allows functional particles to be delivered evenly throughout the entire region R1.

[0071] Furthermore, during the sterilization process, the rotation direction of the washing tub 2 is the same as the rotation direction of the dewatering process (arrow B shown in Figure 3). Specifically, the rotation direction of the washing tub 2 during the sterilization and dewatering processes is opposite to the direction in which the water-stopping rib 37 extends.

[0072] Furthermore, the rotation direction of the washing tub 2 during the sterilization process is the same as the rotation direction of the washing tub 2 during the drying process. Therefore, the motor 14 can be operated continuously without being stopped to reverse direction between the drying process and the sterilization process.

[0073] Because the recess 39 is partially covered by the water-stopping rib 37, air is relatively difficult to enter from outside the recess 39, and air tends to stagnate inside the recess 39. In contrast, during the sterilization and drying processes, the rotation direction of the washing tub 2 is opposite to the direction in which the water-stopping rib 37 extends, making it easier for air to flow into the recess 39 from the opening 38. Therefore, during the drying process, the entire outer tub 8 can be dried, and during the sterilization process, functional particles can be applied to the entire wall surface of the outer tub 8.

[0074] This embodiment assumes that the washing tub 2 rotates to the right, but it is naturally possible to rotate it to the left as appropriate.

[0075] In the sterilization process, the rotation speed of the washing tub 2 is lower than the rotation speed in the spin-drying process (for example, 1000 rpm). By lowering the rotation speed of the washing tub 2, the load on the motor 14, noise, and running costs can be reduced.

[0076] Here, the rotation speed of the washing tub 2 during the sterilization process will be explained in more detail with reference to Figure 9. Figure 9 is a diagram showing the delivery efficiency of functional particles in the outer tub 8 of the washing and drying machine 1.

[0077] An evaluation was conducted to clarify the relationship between the rotation speed of the washing tub 2 and the delivery ratio of functional particles. The evaluation samples used were those that decompose through a chemical reaction with the functional particles, resulting in a change in the absorption spectrum of the substance. The chemical reaction was, for example, a redox reaction. In the evaluation test, multiple evaluation samples were placed on the wall surface constituting region R1, and the sterilization process was performed at different rotation speeds of the washing tub 2.

[0078] The reaction amount between the evaluation sample and the functional particles can be determined by detecting the color difference caused by the change in the absorption spectrum. By comparing the color difference ΔE of the evaluation sample before and after the sterilization process, the amount of functional particles delivered could be compared at different rotation speeds. The color difference ΔE is calculated using equations (1) to (4), based on the measured values ​​of the lightness L0 of the evaluation cloth before operation, the lightness L1 of the evaluation cloth after operation, the color coordinates a0 of the evaluation cloth before operation, the color coordinates a1 of the evaluation cloth after operation, the color coordinates b0 of the evaluation cloth before operation, and the color coordinates b1 of the evaluation cloth after operation. ΔE = √(ΔL) 2 +Δa 2 +Δb 2 ) (1) ΔL = L0 - L1(2) Δa = a0 - a1 (3) Δb=b0-b1(4)

[0079] The ratio A of functional particles delivered to the outer tank 8 is the color difference ΔE at a predetermined rotation speed x. x And, the color difference ΔE at a rotation speed of 35 rpm 35 Therefore, it can be calculated using the following equation (5). A=ΔE x / ΔE 35 (5)

[0080] As shown in Figure 9, a rotation speed of 20 rpm or higher provides sufficient centrifugal force to promote the flow of air and functional particles through the through-hole 2a. A rotation speed of 100 rpm or lower maintains appropriate centrifugal force, suppressing the functional particles from colliding with the walls of the airflow path 23 and becoming inactive. It was also found that the ratio A of functional particles delivered to the outer tub 8 is maximized at 35 rpm. Therefore, the rotation speed of the washing tub 2 in the sterilization process may be between 20 rpm and 100 rpm, and preferably 35 rpm.

[0081] The evaluation test shown in Figure 9 confirmed the conditions under which the amount of functional particles delivered increases. These conditions can be rephrased as the conditions under which the amount of air containing functional particles delivered increases. Therefore, the evaluation test shown in Figure 9 also confirmed the conditions under which the amount of air delivered to region R1 increases during the drying process.

[0082] Returning to Figures 5 and 6, the rotation speed of the washing tub 2 during the sterilization process is the same as the rotation speed of the washing tub 2 during the drying process. Therefore, the washing tub 2 can be operated continuously at a constant speed without decelerating between the drying and sterilization processes.

[0083] The sterilization process is longer than the drying process, for example, 150 minutes. This operation can sterilize 99% of mold spores in the outer tub 8. Furthermore, by continuously operating the functional particle supply means 3 and circulating it inside the washing and drying machine 1, the concentration of functional particles in the outer tub 8 can be increased, maintaining a high concentration state.

[0084] 150 minutes after the start of the sterilization process, the control means 25 automatically turns off the power to the washing machine 1.

[0085] [Effect 1] The washing machine 1 according to this embodiment can achieve the following effects.

[0086] As described above, the washing machine 1 of this embodiment has a washing tub 2 for holding laundry and an outer tub 8 that rotatably houses the washing tub 2. The washing machine 1 has a motor 14 for rotating the washing tub 2 and a water supply means (water supply valve 30) for supplying washing water to the outer tub 8. The washing machine 1 has an air supply path 23 that can supply air into the outer tub 8 and a functional particle supply means 3 arranged in the air supply path 23 for supplying functional particles into the outer tub. The washing machine 1 has a control means 25 that controls the operation of the motor 14 and the functional particle supply means 3. The control means 25 operates the motor 14 and the functional particle supply means 3 to execute a tub clean course (sterilization process) that sterilizes the washing tub 2 and the outer tub 8.

[0087] With this configuration, as the washing tub 2 rotates, centrifugal force acts on the air and functional particles, causing them to flow to the outside of the washing tub 2. This makes it easier to deliver the functional particles to the wall surface of the outer tub 8, thereby disinfecting mold spores attached to the wall surface of the outer tub 8. Consequently, the disinfection performance of mold spores in the outer tub 8 can be improved in the washer-dryer 1.

[0088] In the washing and drying machine 1 of this embodiment, the rotation speed of the washing tub 2 during the sterilization process is lower than the rotation speed of the washing tub 2 during the dewatering process for dewatering the laundry.

[0089] This configuration ensures sufficient centrifugal force to deliver functional particles to the outer tank 8 while reducing the load on the motor 14. This makes it possible to perform a long-duration sterilization process.

[0090] In the washing machine 1 of this embodiment, the rotation speed of the washing tub 2 during the sterilization process is 20 rpm or more and 100 rpm or less.

[0091] This configuration allows for the delivery of more functional particles that maintain their sterilization function to the outer tank 8.

[0092] The washing and drying machine 1 of this embodiment further includes a blowing means (blower fan 11) arranged in the airflow path 23 for blowing air. The control means 25 stops the blower fan 11 during the sterilization process.

[0093] With this configuration, compared to when the blower fan 11 is running, there is no pressure difference in the airflow path 23, making it less likely for air and functional particles to be drawn into the airflow path 23 from the opening 33, and allowing them to flow more easily to the outer tank 8, which is far from the airflow path 23. As a result, more functional particles can be delivered to the wall surface of the outer tank 8.

[0094] In the washing and drying machine 1 of this embodiment, the direction of rotation of the washing tub 2 during the sterilization process is the same as the direction of rotation of the washing tub 2 during the dewatering process for dewatering the laundry.

[0095] This configuration allows the flow of water in the dewatering process and the flow of functional particles in the sterilization process to be the same by making the rotation direction the same. Therefore, functional particles can be applied to areas where water adheres and mold is likely to grow.

[0096] In the washing machine 1 of this embodiment, a recess 39 is formed in the lower part of the outer tub 8, where a drain port 35 is provided. The outer tub 8 has a projection (water-stopping rib 37) that extends in the circumferential direction of the outer tub 8 and covers a part of the upper part of the recess 39. The rotation direction of the washing tub 2 during the sterilization process is opposite to the direction in which the water-stopping rib 37 extends.

[0097] This configuration facilitates airflow into the recessed area 39, where air is less likely to flow in from the outside, and allows functional particles to be efficiently delivered to the recessed area 39.

[0098] In the washing and drying machine 1 of this embodiment, the functional particle supply means 3 is an electrostatic atomizing device, and the functional particles are charged fine water particles.

[0099] This configuration allows for the elimination of mold spores.

[0100] The washing and drying machine 1 of this embodiment includes a washing machine and a heating means (heat pump unit 10) for heating air.

[0101] This configuration allows for efficient drying of the inside of the washing machine / dryer 1.

[0102] The method for disinfecting the outer tub 8 of the washer-dryer 1 in this embodiment is a method for disinfecting the outer tub 8 of a washing machine (washer-dryer 1) which comprises a washing tub 2 for holding laundry and an outer tub 8 that rotatably houses the washing tub 2. The method involves a control means 25 that controls the operation of the washer-dryer 1 operating a motor 14 that rotates the washing tub 2 and a functional particle supply means 3 that supplies functional particles into the outer tub 8 to execute a tub clean course that disinfects the washing tub 2 and the outer tub 8.

[0103] With this configuration, as the washing tub 2 rotates, air and functional particles flow to the outside of the washing tub 2. This makes it easier to deliver the functional particles to the wall surface of the outer tub 8, and thus disinfects mold spores attached to the wall surface of the outer tub 8.

[0104] [Effect 2] As described above, the washing machine 1 of this embodiment includes a washing tub 2 for holding laundry, an outer tub 8 that rotatably houses the washing tub 2, and a motor 14 for rotating the washing tub 2. The washing machine 1 also includes a functional particle supply means 3 for supplying functional particles into the outer tub, and a control means 25 for controlling the operation of the motor 14 and the functional particle supply means 3. The control means 25 executes a tub cleaning course. The tub cleaning course includes a sterilization step that operates the motor 14 and the functional particle supply means 3, and a drying step that operates the motor 14 before the sterilization step.

[0105] With this configuration, before operating the functional particle supply means 3, the washing tub 2 is rotated to create an airflow toward the outer tub 8, thereby drying the outer tub 8 and reducing the amount of moisture adhering to it. Therefore, in the sterilization process that follows the drying process, it is possible to suppress the functional particles from colliding with residual water in the outer tub 8 and becoming inactive. Consequently, the sterilization performance of mold spores in the outer tub 8 can be improved in the washing and drying machine 1.

[0106] The washing and drying machine 1 of this embodiment includes an airflow path 23 that allows air to flow into the outer tub 8, a heating means (heat pump unit 10) arranged in the airflow path 23 for heating the air, and an airflow means (air blower fan 11) arranged in the airflow path 23 for blowing air. The control means 25 operates the heat pump unit 10 and the air blower fan 11 for a predetermined time during the drying process.

[0107] With this configuration, the amount of moisture adhering to the outer tank 8 can be reduced more efficiently by operating the heat pump unit 10 and the blower fan 11 before operating the functional particle supply means 3.

[0108] In the washing and drying machine 1 of this embodiment, the direction of rotation of the washing tub 2 during the drying process is the same as the direction of rotation of the washing tub 2 during the sterilization process.

[0109] This configuration makes it possible to avoid the deceleration of motor 14 that occurs when motor 14 reverses direction.

[0110] In the washing machine 1 of this embodiment, the rotation speed of the washing tub 2 during the drying process is the same as the rotation speed of the washing tub 2 during the sterilization process.

[0111] With this configuration, the air supply efficiency to the outer tank 8 can be improved in the drying process, as in the sterilization process, and the rotational speed of the motor 14 can be set to reduce the load.

[0112] In the washing and drying machine 1 of this embodiment, during the drying process, after the blower fan 11 is driven and a waiting period has elapsed, the heat pump unit 10 is activated.

[0113] With this configuration, even during the start-up time of the heat pump unit 10, dry air in the airflow path 23 can be sent to the washing tub 2 to remove residual water, thus making effective use of the start-up time.

[0114] In the washing and drying machine 1 of this embodiment, the control means 25 stops the heat pump unit 10 and the blower fan 11 during the sterilization process.

[0115] This configuration allows for the delivery of more functional particles to the wall surface of the outer tank 8, which is far from the airflow path 23. Furthermore, it allows for the delivery of more functional particles while maintaining their antibacterial properties.

[0116] In the washing and drying machine 1 of this embodiment, the control means 25 stops the functional particle supply means 3 during the drying process.

[0117] This configuration allows for the supply of functional particles after removing residual water from the outer tank 8. Therefore, it is possible to reduce the load on the functional particle supply means 3 while suppressing the deactivation of functional particles by collision with residual water in the outer tank 8.

[0118] The method for disinfecting the outer tub 8 of the washer-dryer 1 of this embodiment is a method for disinfecting the outer tub 8 of a washing machine (waher-dryer 1) which comprises a washing tub 2 for containing laundry and an outer tub 8 that rotatably houses the washing tub 2. The method includes a disinfection step in which a control means 25 that controls the operation of the washer-dryer 1 operates a motor 14 that rotates the washing tub 2 and a functional particle supply means 3 that supplies functional particles into the outer tub 8. The method also includes a drying step in which the control means 25 operates the motor 14 before the disinfection step.

[0119] With this configuration, the outer tub 8 can be dried and the amount of moisture adhering to it can be reduced by rotating the washing tub 2 before operating the functional particle supply means 3.

[0120] Although this embodiment describes a washer-dryer 1, it is not limited to this. A washer-dryer can be any device capable of washing laundry. It may also be a washing machine that only has the function of washing laundry. Alternatively, a washer-dryer may be a clothes dryer that only has the function of drying clothes.

[0121] In this embodiment, an example in which the washing machine 1 has an operation display unit 5 has been described, but the invention is not limited to this. For example, the washing machine 1, the server, and the communication terminal may be connected via an internet line, and the user may input settings using an application on the communication terminal.

[0122] In this embodiment, an example was described in which the control means 25 executes a laundry processing course entered by the user, but the embodiment is not limited to this. For example, the control means 25 may execute a laundry processing course downloaded from the server to the washing machine 1.

[0123] In this embodiment, an example has been described in which the washing machine 1 has an airflow path 23 for circulating air, but it is not limited to this. The washing machine 1 only needs to be capable of drying laundry. The washing machine 1 may also have an exhaust path that allows air to pass in one direction. On the other hand, if the washing machine 1 has an airflow path 23 for circulating air, the generated functional particles can be circulated inside the washing machine 1. Therefore, the inside of the washing machine 1 can be disinfected efficiently.

[0124] Furthermore, although this embodiment describes an example in which the functional particle supply means 3 is located downstream of the blower fan 11 in the airflow path 23, it is not limited to this. The functional particle supply means 3 only needs to be located in a position that can deliver functional particles to the outer tub 8. For example, the functional particle supply means 3 may be located on the door 4. In this case, by bringing the functional particle supply means 3 closer to the washing tub 2, the functional particles can be delivered more efficiently to the walls of the washing tub 2 and the outer tub 8. However, by locating the functional particle supply means 3 downstream of the blower fan 11 in the airflow path 23, it is possible to prevent detergent foam and water from splashing onto the functional particle supply means 3, thereby suppressing malfunctions of the functional particle supply means 3.

[0125] In this embodiment, an example was described in which the tub cleaning course has a drying step and a sterilization step, but it is not limited to this. The tub cleaning course only needs to have a sterilization step.

[0126] In this embodiment, the time, content, order, and number of steps in the tank cleaning course are merely examples. It is possible to select different times, change the order of steps, or increase the number of steps or their frequency as needed.

[0127] In this embodiment, an example in which the drum cleaning course is performed after the wash cycle has been described, but it is not limited to this. The drum cleaning course may be performed after the dry cycle, or it may be performed independently without a wash cycle.

[0128] In this embodiment, an example was described in which the laundry is removed from the washer-dryer 1 before the drum cleaning course, but this is not the only example. For example, the drum cleaning course may be run before removing the laundry or after putting the laundry in. By doing so, the functional particles can act on the laundry to disinfect it. On the other hand, if the drum cleaning course is run after removing the laundry, the functional particles will not come into contact with the laundry and can efficiently reach the wall surface of the outer drum 8.

[0129] In this embodiment, an example in which the functional particle supply means 3 operates continuously during the sterilization process has been described, but the embodiment is not limited to this. The functional particle supply means 3 may also be operated intermittently during the sterilization process.

[0130] In this embodiment, an example of stopping the blower fan 11 during the sterilization process has been described, but the embodiment is not limited to this. The blower fan 11 may be operated temporarily or continuously during the sterilization process.

[0131] In this embodiment, an example of stopping the heat pump unit 10 during the sterilization process has been described, but the invention is not limited to this. The heat pump unit 10 may be operated temporarily or continuously during the sterilization process.

[0132] In this embodiment, an example has been described in which the rotation direction of the motor 14 in the sterilization process is unidirectional, but the invention is not limited to this. The rotation direction of the motor 14 may be reversed during the sterilization process.

[0133] In this embodiment, an example was described in which the functional particle supply means 3 is stopped during the drying process, but this is not the only example. For example, the functional particle supply means 3 may be operating during the drying process.

[0134] The washing machine in the first embodiment comprises a washing tub for containing laundry, an outer tub rotatably housing the washing tub, a housing elastically supporting the outer tub, a motor for rotating the washing tub, a functional particle supply means for supplying functional particles into the outer tub, and a control means for controlling the operation of the motor and the functional particle supply means, wherein the control means executes a tub cleaning course, and the tub cleaning course comprises a sterilization step for operating the motor and the functional particle supply means, and a drying step for operating the motor before the sterilization step.

[0135] In a second embodiment, the washing machine, in the first embodiment, includes an airflow path that allows air to flow into the outer tub, a heating means arranged in the airflow path for heating the air, and an airflow means arranged in the airflow path for blowing air, wherein the control means operates the heating means and the airflow means for a predetermined time during the drying process.

[0136] In the third embodiment of the washing machine, the direction of rotation of the washing tub during the drying process and the direction of rotation of the washing tub during the sterilization process are the same as in the washing machine of the second embodiment.

[0137] In the fourth embodiment, the washing machine is such that, in the second or third embodiment, the rotation speed of the washing tub during the drying process is the same as the rotation speed of the washing tub during the sterilization process.

[0138] In the fifth embodiment, as a washing machine according to any of the second to fourth embodiments, in the drying process, after the air blowing means is driven and a waiting time has elapsed, the heating means is activated.

[0139] In the washing machine according to the sixth embodiment, in the washing machine according to any of the second to fifth embodiments, the control means stops the heating means and the blowing means during the sterilization process.

[0140] In the seventh embodiment, as a washing machine in any of the second to sixth embodiments, the control means stops the functional particle supply means during the drying process.

[0141] In the eighth aspect of the washing machine, in any of the first to seventh aspects, the direction of rotation of the washing tub in the tub cleaning course is the same as the direction of rotation of the washing tub in the dewatering process for dewatering the laundry.

[0142] As a washing machine in the ninth embodiment, in a washing machine in any of the first to eighth embodiments, a recess is formed in the lower part of the outer tub where a drain port is provided, the outer tub has a projection that extends in the circumferential direction of the outer tub and covers a part of the upper part of the recess, and the direction of rotation of the washing machine in the tub cleaning course is opposite to the direction in which the projection extends.

[0143] A method for disinfecting the outer tub of a washing machine in a tenth embodiment is a method for disinfecting the outer tub of a washing machine comprising a washing tub for containing laundry and an outer tub rotatably housing the washing tub, the method comprising: a disinfection step in which a control means for controlling the operation of the washing machine operates a motor for rotating the washing tub and a functional particle supply means for supplying functional particles into the outer tub; and a drying step in which the control means operates the motor before the disinfection step.

[0144] While this disclosure is adequately described in relation to preferred embodiments with reference to the accompanying drawings, various modifications and alterations will be obvious to those skilled in the art. Such modifications and alterations should be understood to be included within the scope of the invention as defined by the appended claims. [Industrial applicability]

[0145] The washing machine of this disclosure is useful as a household washer-dryer, a commercial washer-dryer, or any type of washer-dryer (e.g., a household drum-type washer-dryer). [Explanation of Symbols]

[0146] 1. Washer-dryer (dryer) 2. Washing tub 3 Functional particle supply means 4 doors 5 Operation display section 6 cabinets 8 Outer tank 10 Heat pump units 11. Blower fan 13. Blower fan motor 14 motors 23 Airflow path 25 Control means 30 Water supply valve 31 Drain valve 33 Aperture 34 Aperture 35 Drain 38 Aperture 39 Recess 37 Waterproof ribs

Claims

1. A washing tub for holding laundry, An outer tub rotatably housing the aforementioned washing tub, A motor for rotating the washing tub, A functional particle supply means for supplying functional particles into the outer tank, A ventilation path that allows air to flow into the outer tank, A heating means is arranged in the aforementioned airflow path to heat the air, A blowing means is arranged in the aforementioned airflow path and blows air, The system comprises control means for controlling the operation of the motor and the functional particle supply means, The control means executes a tank cleaning course. The tank cleaning course includes a sterilization step that operates the motor and the functional particle supply means, and a drying step that operates the motor before the sterilization step. The control means is In the drying process, the heating means and the blowing means are operated for a predetermined time. A washing machine that stops the heating means and the blowing means during the sterilization process.

2. A washing tub for storing laundry, An outer tub rotatably housing the aforementioned washing tub, A motor for rotating the washing tub, A functional particle supply means for supplying functional particles into the outer tank, A ventilation path that allows air to flow into the outer tank, A heating means is arranged in the aforementioned airflow path to heat the air, A blowing means is arranged in the aforementioned airflow path and blows air, The system comprises control means for controlling the operation of the motor and the functional particle supply means, The control means executes a tank cleaning course. The tank cleaning course includes a sterilization step that operates the motor and the functional particle supply means, and a drying step that operates the motor before the sterilization step. The drying step of the tank clean course includes a heating air blowing step that operates the heating means and a room temperature air blowing step that stops the heating means. A washing machine in which the heating and blowing process is longer than the room temperature blowing process.

3. The washing machine according to claim 1, wherein the direction of rotation of the washing tub in the drying step and the direction of rotation of the washing tub in the sterilization step are the same.

4. The washing machine according to claim 1, wherein the rotation speed of the washing tub in the drying step is the same as the rotation speed of the washing tub in the sterilization step.

5. The washing machine according to claim 1, wherein, in the drying process, after the air blowing means is driven and a waiting time has elapsed, the heating means is operated.

6. The washing machine according to claim 1, wherein the control means stops the functional particle supply means during the drying process.

7. The washing machine according to claim 1, wherein the direction of rotation of the washing tub in the tub cleaning course is the same as the direction of rotation of the washing tub in the dewatering step for dewatering laundry.

8. A recess is formed in the lower part of the outer tank, where a drain is provided. The outer tank has a projection that extends in the circumferential direction of the outer tank and covers a portion of the upper part of the recess, The washing machine according to any one of claims 1 to 7, wherein the direction of rotation of the washing tub in the tub cleaning course is opposite to the direction in which the projection extends.

9. A method for disinfecting the outer tub of a washing machine, which comprises a washing tub for holding laundry, an outer tub rotatably housing the washing tub, and a blower path that allows air to flow into the outer tub, The control means for controlling the operation of the washing machine includes a sterilization step that operates a motor for rotating the washing tub and a functional particle supply means for supplying functional particles into the outer tub, The control means includes a drying step of operating the motor before the sterilization step, The control means is In the drying process, a heating means arranged in the airflow path for heating air and an air blowing means arranged in the airflow path for blowing air are operated for a predetermined time. A method for disinfecting the outer tub of a washing machine, wherein the heating means and the blowing means are stopped during the disinfection step.

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