Washing machine and method of operating a washing machine

Abstract

The present disclosure provides a washing machine and a method for operating the washing machine. A technology capable of avoiding contact of high-temperature water with an object when steam is applied to the object housed in a washing tub in a vertical washing machine is provided. The washing machine includes an outer tub, a washing tub rotatably disposed in the outer tub, a water supply valve that opens and closes a flow path for supplying water to the washing tub, a pulsator rotatably disposed in a lower portion of the washing tub, a heater that heats water, and a control portion that controls the water supply valve and the heater. The control portion can execute a steam program that supplies steam to an object placed on a holding member provided in the washing tub. In the steam program, the control portion controls the water supply valve to supply water to the washing tub and stop the water supply at a water level lower than the holding member, and generates steam by controlling the heater to heat the water.

Description

Technical Field

[0001] This disclosure relates to washing machines and methods of operating washing machines. Background Technology

[0002] Patent document 1 discloses a drum washing machine capable of supplying steam into a receiving tank.

[0003] Patent Document 2 discloses a washing machine and its control method, which uses steam to efficiently wet dirt, laundry, and detergent during the initial washing stage. The washing machine disclosed in Patent Document 2 is a vertical washing machine.

[0004] Existing technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent No. 7426567

[0007] Patent Document 2: Japanese Patent Application Publication No. 2014-147782 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] In the vertical washing machine disclosed in Patent Document 2, there is a problem that the clothes get wet during the aforementioned stage of using steam.

[0010] This disclosure provides a technique that can prevent hot water from coming into contact with clothes or other objects contained in a washing tub when steam is applied to them in a vertical washing machine.

[0011] Solution for solving the problem

[0012] The washing machine disclosed herein includes: an outer tub; a washing tub rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing tub; a pulsator rotatably disposed at the lower part of the washing tub; a heater for heating water; and a control unit for controlling the water supply valve and the heater. The control unit is capable of executing a steam program to supply steam to an object placed on a holding member disposed within the washing tub. In the steam program, the control unit controls the water supply valve to supply water to the washing tub and stops supplying water at a level lower than the holding member, and generates steam by controlling the heater to heat the water.

[0013] The washing machine operation method disclosed herein includes: an outer tub; a washing tub rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing tub; a pulsator rotatably disposed at the lower part of the washing tub; a heater for heating water; and a control unit for controlling the water supply valve and the heater. The operation method includes: in a steam process where steam is supplied to an object placed on a holding member disposed within the washing tub, the control unit controls the water supply valve to supply water to the washing tub and stops supplying water at a level lower than the holding member; and in the steam process, the control unit generates steam by controlling the heater to heat the water.

[0014] Invention Effects

[0015] According to this disclosure, a technique is provided that can prevent hot water from coming into contact with clothes or other objects contained in a washing tub when steam is applied to them in a vertical washing machine. Attached Figure Description

[0016] Figure 1 This is a schematic cross-sectional view of the washing machine according to the implementation method.

[0017] Figure 2 This is a top view of the outer tub, washing tub, and pulsator of the aforementioned washing machine.

[0018] Figure 3 This is a side view of the aforementioned impeller.

[0019] Figure 4 This is a diagram showing a specific example of the retaining member used in the steam program performed in the washing machine described above.

[0020] Figure 5 This is a diagram illustrating the sequence of the steam process described above.

[0021] Figure 6 This is a schematic diagram illustrating the internal state of the washing machine during the steam process described above.

[0022] Figure 7 This is a flowchart illustrating the water supply process of the aforementioned steam procedure.

[0023] Figure 8 This is a flowchart illustrating the steam process of the above-described steam procedure. Detailed Implementation

[0024] Hereinafter, a washing machine according to embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, sometimes unnecessary detailed descriptions are omitted. For example, detailed descriptions of matters already known may be omitted, or repetitive descriptions of substantially the same structures may be omitted. This is to avoid unnecessarily lengthy descriptions and to facilitate understanding by those skilled in the art. Furthermore, the accompanying drawings and the following description are provided to enable those skilled in the art to fully understand the present disclosure and are not intended to limit the subject matter of the claims.

[0025] Figure 1 This is a schematic cross-sectional view of a washing machine 100 according to an embodiment of this disclosure. This washing machine 100 is not a front-loading washing machine without a pulsator, but rather a vertical washing machine equipped with a pulsator 160. This vertical washing machine 100 differs from a front-loading washing machine where the loading port for loading clothes is formed on the side of the washing machine, as... Figure 1 As shown, in this washing machine 100, the inlet 112 is formed at the top. This washing machine 100 is capable of executing a steam program that supplies steam to and treats items such as clothing, shoes, and cloth toys. This steam program can also be, for example, a deodorizing program that uses steam to deodorize the item (the deodorizing item). This deodorizing program is a type of steam program. Details of the steam program (deodorizing program) will be described later.

[0026] [Overall structure of the washing machine]

[0027] Figure 2 This is a top view of the outer tub 120, washing tub 140, and pulsator 160 of the washing machine 100. Figure 3 This is a side view of the 160 pulsator.

[0028] like Figures 1-3 As shown, the washing machine 100 includes a housing 110, an outer tub 120 (water tank), a washing tub 140 (rotating tub), a water supply unit 150, a pulsator 160, a motor 200, a heater 250, and a control unit 190.

[0029] The housing 110 has, for example, a generally rectangular parallelepiped shape. An inlet 112 for inserting clothing into the housing 110 is formed on the upper wall 111. A cover 113 capable of opening and closing the inlet 112 is installed on the upper wall 111. That is, the cover 113 is configured to be movable relative to the upper wall 111 between a closed position with the inlet 112 closed and an open position with the inlet 112 open.

[0030] An outer tub 120 is disposed within a housing 110. The outer tub 120 has a generally cylindrical shape. It has an upwardly opening upper portion, a bottom 121, and a cylindrical portion located between the upper portion and the bottom 121, extending upward from the periphery of the bottom 121. The outer tub 120 is capable of storing water. The outer tub 120 is resiliently held within the housing 110 by a plurality of suspension systems 170 disposed within the housing 110. A washing tub 140 and a pulsator 160 are rotatably disposed within the outer tub 120.

[0031] A drain outlet 123 is formed at the bottom 121 of the outer tank 120 for draining water accumulated in the outer tank 120. The drain outlet 123 is connected to a drain pipe 124 that forms a flow path for water to drain from the outer tank 120. The front end of the drain pipe 124 (the downstream end when water flows) is disposed outside the housing 110. A drain valve 130 is installed on the drain pipe 124. The drain valve 130 is configured to switch between an open state that allows drainage from the outer tank 120 through the drain outlet 123 and a closed state that prevents drainage from the outer tank 120 through the drain outlet 123. The opening and closing of the drain valve 130 is controlled by a control unit 190.

[0032] The washing tub 140 has a generally cylindrical shape. The washing tub 140 has an upwardly opening upper portion, a bottom 141, and a cylindrical portion 143 located between the upper portion and the bottom 141 and extending upward from the periphery of the bottom 141. Objects such as clothing 500 (see description below) Figure 6 The water is introduced into the housing 110 through the inlet 112 and housed within the washing tank 140. Numerous through holes 142 (e.g., numerous small holes) are formed in the peripheral wall of the washing tank 140, specifically in the cylindrical portion 143 of the washing tank 140. Water (liquid water) within the washing tank 140 can flow into the outer tank 120 through these through holes 142, and water (liquid water) located between the outer tank 120 and the washing tank 140 can also flow into the washing tank 140 through these through holes 142. Therefore, the water level in the space between the outer surface of the washing tank 140 and the inner surface of the outer tank 120 is approximately the same as the water level in the space surrounded by the inner surface of the washing tank 140.

[0033] In addition, Figure 1 In the illustration, many through holes 142 are depicted only on the upper part of the cylindrical portion 143 of the washing tank 140, but in reality, many through holes 142 are also formed on the lower part of the cylindrical portion 143 of the washing tank 140.

[0034] The water supply unit 150 is configured to supply water to the washing tub 140. The water supply unit 150 includes a water supply pipe 151 forming a flow path from a tap (not shown) and a water supply valve 152 installed on the water supply pipe 151. Figure 1As shown in the specific example, the outlet of the water supply unit 150 can also be positioned within the space of the housing 110 such that water can be supplied from above or above the washing tub 140 into the washing tub 140. In this case, the water flowing from the outlet of the water supply unit 150 falls toward the impeller 160 and is supplied into the washing tub 140. Alternatively, the outlet of the water supply unit 150 can be positioned to supply water into the space between the outer tub 120 and the washing tub 140, rather than into the washing tub 140.

[0035] The water supply valve 152 is configured to open and close the flow path of the water supply pipe 151. Specifically, the water supply valve 152 is configured to switch between an open state that allows water to be supplied through the water supply pipe 151 and a closed state that prevents water from being supplied through the water supply pipe 151. The opening and closing action of the water supply valve 152 is controlled by the control unit 190.

[0036] A pulsator 160 is disposed within a washing tub 140. The pulsator 160 is rotatably disposed at the lower part of the washing tub 140. Specifically, the pulsator 160 is disposed directly above the bottom 141 of the washing tub 140 and is configured to rotate about a vertically extending axis of rotation. By rotating under a steam program, the pulsator 160 is able to agitate the water within the washing tub 140.

[0037] The specific structure of the impeller 160 is not particularly limited; for example, the impeller 160 may also have... Figure 2 and Figure 3 The structure is as shown. The impeller 160 may also have a base portion 161 that is circular when viewed from above and multiple blades 162 for agitating the water in the washing tank 140. The base portion 161 has an upper surface. The upper surface of the base portion 161 may be composed of a plane, a curved surface, or both. Figure 2 As shown, multiple blades 162 are arranged at intervals around each other in the circumferential direction. Figure 3 As shown, multiple blades 162 protrude upwards from the base portion 161. The impeller 160 may also have multiple through holes 163 (e.g., a plurality of through holes 163). These through holes 163 may, for example, extend through the base portion 161 in the vertical direction. When the impeller 160 has multiple through holes 163, water in the washing tank 140 can move vertically through these through holes 163. Alternatively, the impeller 160 may not necessarily have through holes 163.

[0038] The washing tub 140 and the impeller 160 are each driven by a motor 200.

[0039] The motor 200 is configured to rotate the washing tub 140 and the impeller 160 together within the outer tub 120. Alternatively, the motor 200 can be configured to rotate the impeller 160 without rotating the washing tub 140. The motor 200 may also be disposed, for example, within the housing 110 at the bottom 121 of the outer tub 120. The operation of the motor 200 is controlled by the control unit 190.

[0040] The following describes a specific example of motor 200. However, as long as motor 200 can switch between rotating washing tub 140 and impeller 160 together and rotating only impeller 160, the structure of motor 200 is not limited to the specific example described below.

[0041] The motor 200 may, for example, include a stator, a rotor, and a clutch 203. The stator may also be configured such that its central axis is the same as the rotation axis of the washing tub 140 and the rotation axis of the impeller 160. The rotor may, for example, be configured to have permanent magnets, rotating by current flowing through the stator. The rotor may also be connected to a shaft extending downward from the impeller 160. When the rotor rotates, the impeller 160 rotates. The clutch 203 may also be connected to a shaft extending downward from the washing tub 140. When the clutch 203 rotates, the washing tub 140 rotates. The clutch 203 may also be configured to engage with and disengage from the rotor. When the rotor rotates while the clutch 203 is engaged with the rotor, the washing tub 140 and the impeller 160 rotate together. On the other hand, when the rotor rotates while the clutch 203 is disengaged from the rotor, the washing tub 140 does not rotate, but the impeller 160 rotates.

[0042] The heater 250 is configured to heat the water in the outer tank 120. That is, the heater 250 heats the water in the washing tank 140 by heating the water in the outer tank 120. Figure 1 In the specific example shown, the heater 250 is installed at the bottom 121 of the outer tank 120, but the location where the heater 250 is installed is not limited to... Figure 1 The specific example shown is as follows. For instance, the heater 250 may also be installed in the cylindrical portion of the outer tank 120 (specifically, the lower portion of the cylindrical portion). Alternatively, the heater 250 may also be installed in the lower portion of the washing tank 140. The operation of the heater 250 is controlled by the control unit 190.

[0043] The washing machine 100 may also include a retaining member 300. However, the retaining member 300 may not necessarily be a component of the washing machine 100.

[0044] The retaining member 300 is a component used in the steam process. The retaining member 300 is configured to be disposed within the washing tub 140. The retaining member 300 is disposed within the washing tub 140 at a height separating it from the impeller 160 upwards. In the steam process, the retaining member 300 retains the object 500. In other words, in the steam process, the object 500 is disposed on the retaining member 300.

[0045] Figure 4 This is a diagram illustrating a specific example of a retaining member 300 used in a steam process. Figure 4 The common feature in the specific examples 1 to 3 shown is as follows: The retaining member 300 has a base portion 301 for arranging the object 500 and a plurality of engaging portions 302 fixed to the base portion 301. In each of the base portions 301 of the retaining members 300 in specific examples 1 to 3, a plurality of through holes 303 are formed, which allow steam generated below the retaining member 300 during the steam process to move upwards from the base portion 301.

[0046] Multiple engaging portions 302 can be detachably installed on the washing tub 140. The multiple engaging portions 302 can also be arranged spaced apart from each other along the periphery of the base portion 301.

[0047] like Figure 1 As shown, the washing machine 100 may also have a stop 400 capable of mounting multiple engaging parts 302. Figure 4 In each of the specific examples 1 to 3, the multiple engaging portions 302 of the retaining member 300 are, for example, hook-shaped. In this case, the stop portion 400 may also be formed by multiple through holes 142 that are part of a plurality of through holes 142 in the washing tub 140. By engaging the multiple engaging portions 302 with the multiple through holes 142 respectively, the retaining member 300 can be positioned in the washing tub 140 at a height separated from the impeller 160 upwards.

[0048] exist Figure 4 In the specific example 1, the retaining member 300A has a base portion 301 composed of a mesh (a mesh-like member). Figure 4 In the specific example 2, the retaining member 300B, the base portion 301 is formed of a relatively hard material, such as metal. Figure 4 In the specific example 3, the holding member 300C is formed of a base portion 301, for example, from a material that is softer than metal, such as plastic. Furthermore, the holding member 300 is only required to have the function of holding the object 500 during a steam process, and is not limited to any particular type. Figure 4 The structures shown in Examples 1 to 3 are not limited to the materials shown in Examples 1 to 3.

[0049] Furthermore, the structure of the retaining member 300 and the stop portion 400 are not limited to the specific examples described above. For example, the stop portion 400 may not necessarily be composed of multiple through holes 142. The stop portion 400 may also be a part of the washing tub 140 (excluding the through holes 142) having a structure that allows the retaining member 300 to engage. In addition, the stop portion 400 may also be composed of a component different from the washing tub 140. Specifically, the stop portion 400 may, for example, be one or more components that can be mounted on the inner surface of the cylindrical portion 143 of the washing tub 140, and the retaining member 300 may also have a structure that allows it to engage with such a stop portion 400.

[0050] The washing machine 100 may also include a notification unit 350. During the steam cycle, the notification unit 350 notifies the user to add the object 500 into the washing tub 140. That is, the notification unit 350 can notify the user of the time to add the object 500. The notification unit 350 is only a device that can prompt the user to add the object 500 into the washing tub 140, and the specific structure of the notification unit 350 is not particularly limited.

[0051] The notification unit 350 may, for example, include an audio device such as a buzzer or speaker for prompting the insertion of the object 500 into the washing tub 140 via sound. Alternatively, the notification unit 350 may include a light-emitting device such as a light-emitting element for prompting the insertion of the object 500 into the washing tub 140 via light. Furthermore, the notification unit 350 may include a display device such as a monitor for prompting the insertion of the object 500 into the washing tub 140 via the display of characters, graphics, etc. Additionally, the notification unit 350 may include two or more of the aforementioned audio device, light-emitting device, and display device.

[0052] exist Figure 1 In the specific example shown, the notification unit 350 is disposed on the upper part of the housing 110 (for example, directly below the upper wall 111 of the housing 110), but the location where the notification unit 350 is disposed is not limited to. Figure 1 The specific example shown is that the operation of the notification unit 350 is controlled by the control unit 190.

[0053] like Figure 1 As shown, the washing machine 100 may also include a water level sensor 450. The water level sensor 450 can measure the water level in the outer tub 120, i.e., the water level in the washing tub 140, during the steam program. The measurement result of the water level sensor 450 is input to the control unit 190.

[0054] Additionally, the washing machine 100 may also include an insertion determination sensor 460 for determining whether the object 500 has been inserted into the washing tub 140. This insertion determination sensor 460 may be, for example, a sensor capable of detecting the opening and closing of the lid 113. Alternatively, the insertion determination sensor 460 may be, for example, a sensor capable of detecting the presence or absence of the object 500 in the washing tub 140, such as an infrared sensor. The measurement result from the insertion determination sensor 460 is input to the control unit 190.

[0055] Additionally, the washing machine 100 may also include a temperature sensor 470 that measures the temperature of the water in the outer tub 120, i.e., the temperature of the water in the washing tub 140. The temperature sensor 470 can measure the temperature of the water in the outer tub 120 (the temperature of the water in the washing tub 140) during the steam program. The measurement result of the temperature sensor 470 is input to the control unit 190.

[0056] The control unit 190 includes a computer with an arithmetic processing unit and a memory. The control unit 190 may also be configured as a microcontroller, for example. The control unit 190 is a controller that controls the operation of the washing machine 100. Specifically, for example, the control unit 190 controls the operation of the washing machine 100 during a steaming program. The function of the control unit 190 is achieved by executing a control program stored in the memory using the aforementioned arithmetic processing unit.

[0057] [The actions of the washing machine]

[0058] The washing machine 100 is capable of performing a washing program for washing clothes and other laundry items. Additionally, the washing machine 100 can execute a steam program that supplies steam to the clothes and other items 500 and treats the items 500 with steam. When steam is applied to the items 500, it can deodorize the items and straighten out wrinkles. This steam program can also be, for example, a deodorizing program that uses steam to deodorize the items 500 (the deodorizing items). The washing machine 100 can also continuously perform both the steam program and the washing program, but it can also perform the steam program without performing a washing program (e.g., performing only a steam program). See below for reference. Figures 5-8 The deodorization process, which is a type of steam process, is specifically described. Furthermore, even when a steam process other than the deodorization process is executed, the control unit 190 can still control the steam process by performing [actions related to steam control]. Figures 5-8 The same process is used to execute the steam process, as shown.

[0059] Figure 5 It is a diagram showing the sequence of the deodorization process. Figure 6 This is a schematic diagram illustrating the internal state of the washing machine 100 during the deodorization process. Figure 7 This is a flowchart illustrating the water supply process for the deodorization procedure. Figure 8This is a flowchart illustrating the steam process of the deodorization procedure.

[0060] like Figure 5 As shown, the deodorization process performed by the washing machine 100 includes a water supply process and a steam process. The water supply process includes supplying water to the washing tub 140 by controlling the water supply valve 152 via the control unit 190. The steam process includes generating steam by controlling the heater 250 via the control unit 190 to heat the water in the outer tub 120, i.e., the water in the washing tub 140. In the deodorization process of deodorizing the object 500 placed on the holding member 300 using steam, the control unit 190 controls the water supply valve 152 to supply water to the washing tub 140 and stops supplying water when the water level is lower than that of the holding member 300. After stopping the water supply, the control unit 190 controls the heater 250 to heat the water to generate steam.

[0061] In this washing machine 100, during the deodorization program, the control unit 190 controls the water supply valve 152 to supply water to the washing tub 140 before the object 500 is placed on the holding member 300, and stops supplying water when the water level is lower than that of the holding member 300. Afterwards, after the object 500 is placed on the holding member 300, the heater 250 is controlled to heat the water to generate steam. Therefore, since steam is generated while the object 500 is placed on the holding member 300, deodorization using steam can be performed while avoiding direct contact between the object 500 and the hot water during the deodorization program. Therefore, after the deodorization program, other programs such as washing the object 500 or spin-drying the object 500 are not required; only the deodorization program can be performed. Furthermore, since the object 500 does not come into direct contact with the hot water during the deodorization program, the deodorization program can be performed without causing damage to the object 500. In addition, since the object 500 does not come into direct contact with hot water during the deodorization process, the water temperature can be set to, for example, 70°C or higher during the deodorization process.

[0062] exist Figure 6 The process of the washing machine 100 in the deodorization program is roughly divided into six steps. Figure 6 Steps 1 and 2 are included in the water supply process. Figure 6 Steps 3, 4, 5 and 6 are included in the steam process.

[0063] like Figure 5 As shown, the deodorization program may also include a program selection step. Specifically, for example, the washing machine 100 may also have a display panel 360 (see reference). Figure 1The control unit 190 can also cause the display panel 360 to display and accept user input for program selection. Program options may include, for example, a washing program and a deodorizing program. If the user inputs a deodorizing program selection on the display panel 360, the control unit 190 will... Figure 5 as well as Figure 7 The control of the water supply process, which is described as "start of operation" in the text, is the beginning of the deodorization process.

[0064] Furthermore, during the program selection step, the control unit 190 can also enable the display panel 360 to display and accept input for the user to select any one of multiple deodorization programs. For example, the multiple deodorization programs may include multiple programs that treat the object 500 with steam for different processing times. Specifically, the multiple deodorization programs may also include a short-time program (e.g., a 30-minute program) with the shortest steam processing time, and a long-time program (e.g., a 60-minute program) with a longer steam processing time than the aforementioned short-time program.

[0065] exist Figure 7 In step S101, the control unit 190 can also lock the cover 113 while the cover 113 is in the closed position (the aforementioned closed position). Thus, the state in which the cover 113 closes the inlet 112 is maintained.

[0066] Next, in Figure 7 S102 ( Figure 6 In step 1), the control unit 190 controls the water supply valve 152 to begin supplying water to the washing tub 140. This water supply begins when the washing tub 140 is empty of the object 500. The control unit 190 determines whether the water supply to the washing tub 140 is complete based on the measurement result input from the water level sensor 450. Figure 6 As shown in step 2, when the water level in the washing tank 140 (i.e., the water level in the outer tank 120) reaches or exceeds a predetermined threshold value, namely the water level threshold T1, the control unit 190 determines that the water supply to the washing tank 140 has been completed and controls the water supply valve 152 to stop the water supply to the washing tank 140. The water level threshold T1 is a value corresponding to a water level that is higher than the impeller 160 and lower than the holding member 300. That is, the steam process described later is performed at a water level that is located above the impeller 160 and below the holding member 300.

[0067] Next, in Figure 7 In step S103, the control unit 190 releases the lock on the cover 113. This allows the cover 113 to be moved from the closed position to the open position.

[0068] Next, in Figure 7In step S104, the control unit 190 controls the display panel 360 to display an instruction that prompts the cover 113 to move from the closed position to the open position (i.e., the cover 113 is opened). This display may be, for example, an abbreviation of "open" as described as [OP] in step S104, or another display. The cover 113 is opened by the user prompted by the display on the display panel 360.

[0069] Next, in Figure 7 In step S105, the control unit 190 controls the notification unit 350 to issue a notification prompting the addition of the object 500 to the washing tub 140. Figure 7 In the specific example shown in step S105, the notification from the notification unit 350 is a notification using a buzzer, but it could also be a notification using a speaker, or a notification using the aforementioned light-emitting device or the aforementioned display device.

[0070] Next, in Figure 7 In step S106, the control unit 190 determines whether the object 500 has been successfully placed into the washing tub 140. If the object 500 has not been successfully placed into the washing tub 140 (in step S106, it is "No"), the control unit 190 performs step S105 again. In this case, the control unit 190 may also perform step S105 a second time at predetermined time intervals (e.g., every 10 minutes). On the other hand, if the object 500 has been successfully placed into the washing tub 140 (in step S106, it is "Yes"), the control unit 190 performs step S107. Furthermore, the control unit 190 may, for example, perform step S107 if a predetermined time (e.g., 30 minutes) has elapsed since the time when the display prompting the opening of the lid 113 was made (step S104) or the time when the notification unit 350 made the first notification.

[0071] The determination in step S106 can also be performed as follows. For example, when the user is in... Figure 6After the object 500 is placed on the retaining member 300 in the washing tub 140 as shown in step 2, and the operation of moving the lid 113 from the open position to the closed position (i.e., closing the lid 113) is performed, the insertion determination sensor 460 can also detect the displacement of the lid 113 from the open position to the closed position and input the detection result to the control unit 190. In this case, the control unit 190 can also determine that the object 500 has been inserted into the washing tub 140 based on the detection result input from the insertion determination sensor 460. Alternatively, the washing machine 100 can also be configured so that the user can input the condition that the object 500 has been inserted into the washing tub 140 via the display panel 360. In this case, the control unit 190 can also determine that the object 500 has been inserted into the washing tub 140 based on this input. In this case, the insertion determination sensor 460 can be omitted in the washing machine 100.

[0072] exist Figure 7 In step S107, the control unit 190 locks the cover 113 in the state where the inlet 112 is closed (the closed position mentioned above) and ends the water supply process.

[0073] Next, the control unit 190 performs the function of... Figure 8 The control of the steam process is shown.

[0074] exist Figure 6 Step 3 and Figure 8 In step S201, the control unit 190 controls the heater 250 to heat the water in the outer tank 120 (the water in the washing tank 140). That is, the control unit 190 starts to heat the water (raise the water temperature) using the heater 250.

[0075] exist Figure 8 In step S202, the control unit 190 controls the stirring of the water in the washing tank 140. Step S202 involves heating and stirring the water (heating and stirring). This heating and stirring reduces the temperature difference between the water in the washing tank 140 and the water located between the outer tank 120 and the washing tank 140. Specifically, in step S202, the control unit 190 can either control the motor 200 to rotate only the impeller 160, or control the motor 200 to rotate the washing tank 140 and the impeller 160 together.

[0076] For example, the control unit 190 may start the processing of step S202 if a predetermined time (e.g., 15 minutes) has elapsed since the point in step S201 when the water was heated by the heater 250.

[0077] exist Figure 8In step S203, the control unit 190 may continue to heat the water using the heater 250 (heater heating) and determine whether the water temperature measured by the temperature sensor 470 is above a preset temperature threshold T2. If the water temperature is below the temperature threshold T2 ("No" in step S203), the control unit 190 continues the water stirring in step S202 and the water heating using the heater 250 in step S203. In this case, the control unit 190 can either continuously stir the water (step S202) or intermittently stir the water (step S202). On the other hand, in cases such as Figure 6 If the water temperature is above the temperature threshold T2 as shown in step 4 ("Yes" in step S203), the control unit 190 performs the processing in step S204.

[0078] The temperature threshold T2 is simply the temperature at which the amount of steam required to deodorize the object 500 is generated in the washing tub 140. The specific value of the temperature threshold T2 is not particularly limited, but for example, the temperature threshold T2 can also be set to a value above 70°C.

[0079] The control unit 190 can also control the motor 200 to rotate the impeller 160 in step S204 after controlling the heater 250 to heat the water in the outer tank 120 to a predetermined temperature ("Yes" in step S203). That is, it can also be that after the water temperature measured by the temperature sensor 470 reaches the temperature threshold T2 ("Yes" in step S203), the control unit 190 controls the motor 200 to rotate the impeller 160 in step S204. This stirs the water in the washing tank 140. That is, it is possible to stir the water in the washing tank 140 while supplying steam to the object 500. Compared to the case where water stirring is not performed using the impeller 160, water stirring using the impeller 160 can increase the amount of steam generated. Furthermore, in Figure 8 In step S204, the stirring of water using the impeller 160 is described as "steam stirring".

[0080] The rotational speed of the impeller 160 in step S204 is not particularly limited, but it can be, for example, the same as the rotational speed of the impeller 160 in the washing program described above (e.g., 130 rpm), or a smaller value than the rotational speed of the impeller 160 in the washing program described above (e.g., 50 rpm). The rotational direction of the impeller 160 in step S204 can also be switched to the opposite direction at predetermined intervals.

[0081] While the exact principle behind increasing steam generation through water agitation (steam agitation) using the impeller 160 may not be fully understood, it can be reasonably assumed that, for example, when the heater 250 is positioned at the bottom 121 of the outer tank 120, the temperature of the water located between the outer tank 120 and the washing tank 140, near the lower part of the heater 250, is more likely to be higher than the temperature of the upper part, further away from the heater 250. For the same reason, the temperature of the water in the washing tank 140 is more likely to be higher than the temperature of the upper part. Furthermore, water loses heat from its surroundings during evaporation, so the area near the water surface (water surface) in the washing tank 140 is more likely to lose heat due to evaporation. Consequently, the aforementioned temperature difference is easily generated, but this temperature difference is reduced when the impeller 160 agitates the water. In other words, compared to the case where water agitation is not performed using the impeller 160, the temperature of the area near the surface (water surface) of the water in the washing tank 140 where steam is generated increases due to water agitation using the impeller 160. It is believed that this helps to increase the amount of steam generated compared to not using the impeller 160 to agitate the water.

[0082] The control unit 190 can either continuously perform the processing of step S204 (steam stirring) until the steam process is completed, or it can intermittently perform the processing of step S204 during the steam process.

[0083] Alternatively, after the control unit 190 controls the heater 250 to heat the water in the outer tub 120 to a predetermined temperature ("Yes" in step S203), it can control the motor 200 to rotate the washing tub 140 in step S205. That is, after the water temperature measured by the temperature sensor 470 reaches the temperature threshold T2 ("Yes" in step S203), the control unit 190 can control the motor 200 to rotate the washing tub 140 in step S205. In this case, the washing tub 140 rotates integrally with the impeller 160. By rotating the washing tub 140 while the water in the outer tub 120 (the water in the washing tub 140) is heated to the predetermined temperature (temperature threshold T2), i.e., while deodorizing using steam is in progress, the orientation of the object 500 can be changed. This allows the steam to contact the object 500 evenly.

[0084] The rotational speed of the washing tub 140 in step S205 can also be set to a speed that prevents the water in the washing tub 140 from reaching above the height of the holding member 300 due to the rotation of the washing tub 140. The rotational speed that prevents the water from reaching above the height of the holding member 300 is a value related to the relative height position of the holding member 300 with respect to the washing tub 140 and the water level in the washing tub 140. For example, it can also be preset using methods such as experiments or simulations.

[0085] The rotational speed of the washing tub 140 in step S205 (tub rotation) can be, for example, the same as the rotational speed of the washing tub 140 in the washing program described above (e.g., 35 rpm), or a lower value than the rotational speed of the washing tub 140 in the washing program described above. The rotation direction of the washing tub 140 in step S205 can also be switched to the opposite direction at predetermined intervals.

[0086] The control unit 190 may alternately perform the processing of step S204 (steam agitation) and step S205 (tank rotation). Specifically, the control unit 190 may continuously agitate the water using the impeller 160 until the elapsed time from the point in step S204 when the agitation of the water using the impeller 160 begins reaches a predetermined time threshold T3. When the elapsed time reaches the time threshold T3, the agitation of the water using the impeller 160 ends, and the processing of step S205 (tank rotation) begins. Then, the control unit 190 may continuously rotate the washing tank 140 until the elapsed time from the point in time when the rotation of the washing tank 140 begins reaches a predetermined time threshold T4. When the elapsed time reaches the time threshold T4, the rotation of the washing tank 140 ends.

[0087] The control unit 190 may, for example, determine whether to end the steam process as follows. The control unit 190 may also repeat the process of step S204 (steam stirring) and step S205 (tank rotation) a predetermined number of times (e.g., n times). In this case, in step S205, when the elapsed time reaches the time threshold T4, the control unit 190 may also determine whether the above-mentioned group has been performed n times. If the above-mentioned group has not been performed n times ("No" in step S205), the control unit 190 may repeat the process of step S204. If the above-mentioned group has been performed n times ("Yes" in step S205), the control unit 190 may also perform the process of step S206 (drainage) to end the steam process.

[0088] Alternatively, the control unit 190 may determine whether to terminate the steam process, for example, as follows. Figure 5When the steam processing time is set in the deodorization process during the selected steps of the program selection, the control unit 190 can also determine whether to end the steam process based on the aforementioned processing time. Specifically, for example, the control unit 190 can also measure the elapsed time from the point when the water temperature reaches or exceeds the temperature threshold T2 (step S203) and determine whether the elapsed time has reached the aforementioned processing time. If the elapsed time has not reached the aforementioned processing time ("No" in step S205), the control unit 190 can also perform the processing in step S204 again. If the elapsed time has reached the aforementioned processing time ("Yes" in step S205), the control unit 190 can also perform the processing in step S206 (drainage) to end the steam process.

[0089] In step S206, the control unit 190 controls the drain valve 130 to discharge the water in the washing tank 140 and the water in the outer tank 120 through the drain pipe 124 to the outside of the outer tank 120, and ends the steam process of the deodorization procedure.

[0090] (Modified Example)

[0091] The washing machine described in this disclosure is not limited to the above-described embodiments, but includes, for example, the following variations.

[0092] In the above embodiments, the washing machine 100 includes a notification unit 350, but the notification unit can be omitted in the washing machine of this disclosure.

[0093] In the above embodiment, during the deodorization process, after the control unit 190 stops supplying water at a water level lower than that of the holding member 300, it controls the heater 250 to heat the water to generate steam. However, the timing of the water heating is not limited to the specific example described in the above embodiment. That is, the timing of the water heating does not necessarily have to be after the water supply stops, but can also be during the water supply.

[0094] In the above embodiment, during the deodorization process, after the control unit 190 controls the heater 250 to heat the water in the outer tank 120 to a predetermined temperature ("Yes" in step S203), it starts the steam stirring by controlling the motor 200 to rotate the impeller 160 (step S204). However, the timing of starting the steam stirring is not limited to the specific example described in the above embodiment. That is, the timing of starting the steam stirring does not necessarily have to be after the water temperature reaches the predetermined temperature, or it can be before the water temperature reaches the predetermined temperature.

[0095] In the above embodiment, during the deodorization process, after the control unit 190 controls the heater 250 to heat the water in the outer tank 120 to a predetermined temperature ("Yes" in step S203), it starts controlling the motor 200 to rotate the washing tank 140 (step S205). However, the timing of starting the rotation of the tank is not limited to the specific example described in the above embodiment. That is, the timing of starting the rotation of the tank does not necessarily have to be after the water temperature reaches the predetermined temperature, or it can be before the water temperature reaches the predetermined temperature.

[0096] In addition, Figure 8 In the flowchart, step S202 can be omitted. Additionally, in Figure 7 In the flowchart, S204 and S205 can be omitted. In this case, if the temperature of the water measured by the temperature sensor 470 reaches the temperature threshold T2 ("Yes" in step S203), the control unit 190 performs the process of step S206 (drainage) after deodorizing with steam for a predetermined time from that time point.

[0097] Furthermore, as specific examples of the control unit 190 controlling the water supply valve 152 to supply water to the washing tub 140, the following two methods can be listed. In the first method, water is directly supplied to the washing tub 140 from the outlet of the water supply unit 150. In the second method, water is supplied to the outer tub 120 from the outlet of the water supply unit 150, and the water in the outer tub 120 flows into the washing tub 140 through the through hole 142. In either the first or second method, the control unit 190 can control the water supply valve 152 to supply water to the washing tub 140.

[0098] In the above embodiment, during the water supply process, as in the first embodiment, the water flowing from the outlet of the water supply unit 150 falls towards the impeller 160 and is directly supplied into the washing tank 140. Therefore, in Figure 7After the water supply to the washing tub 140 stops in step S102 (after the water supply is completed), the notification unit 350 issues the aforementioned notification prompting the insertion of the object 500 into the washing tub 140 (step S105). On the other hand, in the water supply process, when water is supplied to the outer tub 120 as in the second method (for example, water is supplied to the space between the outer tub 120 and the washing tub 140), water supply can be carried out with the object 500 placed on the holding member 300. In this case, with the object 500 placed on the holding member 300, water is supplied to the outer tub 120, and the water in the outer tub 120 flows into the washing tub 140 through the through hole 142 of the washing tub 140. In this second method, the notification issued by the notification unit 350 prompting the insertion of the object 500 into the washing tub 140 can be omitted, or it can be carried out before the water supply begins, or it can be carried out during the water supply.

[0099] As explained above, the washing machine in this disclosure includes the following technologies 1 to 7.

[0100] (Technology 1)

[0101] The washing machine according to Technology 1 includes: an outer tub; a washing tub rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing tub; a pulsator rotatably disposed at the lower part of the washing tub; a heater for heating water; and a control unit for controlling the water supply valve and the heater, wherein the control unit is capable of executing a steam program to supply steam to an object placed on a holding member disposed within the washing tub, wherein in the steam program, the control unit controls the water supply valve to supply water to the washing tub and stops supplying water at a water level lower than that of the holding member, and generates steam by controlling the heater to heat the water.

[0102] In the washing machine described in this technology 1, during the steam program, the control unit stops supplying water at a level lower than that of the holding member used to hold clothes or other items, and generates steam. Therefore, steam treatment (e.g., deodorization) can be performed while preventing direct contact between the items and the hot water (liquid water) during the steam program. Thus, after the steam program, other programs such as washing or dehydrating the items are not required; only the steam program can be performed. Furthermore, since the items do not come into direct contact with the hot water (liquid water) during the steam program, the steam program can be performed without causing damage to the items. Additionally, since the items do not come into direct contact with the hot water (liquid water) during the steam program, the water temperature can be set to, for example, 70°C or higher.

[0103] (Technology 2)

[0104] In the washing machine described in the above-mentioned technology 1, a notification unit may also be provided. In the steam program, after the control unit controls the water supply valve to stop supplying water at a water level lower than the holding member, the notification unit controls the notification unit to notify the user to put the object into the washing tub.

[0105] In the washing machine described in this technology 2, a notification prompting the insertion of an object is given after the water supply stops (i.e., after the water supply is completed), so the object is inserted into the washing tub after the water supply is completed. That is, when the object is prompted to be inserted into the washing tub by the notification, the water supply to the washing tub is completed, so the object will not be wetted during the steam cycle. Specifically, the outlet of the water supply unit supplying water to the washing tub is mostly positioned such that water can be supplied from the upper part of the washing tub or a position higher than the washing tub. Even in this case, since the object has not yet been inserted into the washing tub during the water supply, the water level after the water supply stops is lower than the holding member, so the object inserted into the washing tub after the notification will not be wetted. Therefore, even if the object is, for example, an object that cannot be washed, such as clothing, it can be treated with steam (e.g., deodorized with steam) without being wetted in the washing tub.

[0106] (Technology 3)

[0107] In the washing machine described in Technology 1 or Technology 2 above, it is also possible that, during the steam program, the control unit controls the water supply valve to stop supplying water at a water level that is higher than the impeller and lower than the holding member.

[0108] In the washing machine described in this technology 3, by effectively utilizing the height of the washing tub, which is unique to vertical washing machines, a steam cycle can be performed with a water level higher than that of the pulsator. Therefore, compared to the case where no retaining member is provided in the washing tub, a steam cycle can be performed with more water accumulated in the washing tub. As a result, a large amount of steam can be generated during the steam cycle. This allows for efficient steam treatment of objects (e.g., deodorization of objects). Furthermore, it enables steam treatment of relatively large objects.

[0109] (Technology 4)

[0110] In the washing machine described in the above-mentioned technology 3, a motor may also be included, which is used to rotate the impeller. In the steam program, the control unit controls the heater to heat the water in the outer tub to a predetermined temperature, and stirs the water in the washing tub by controlling the motor to rotate the impeller.

[0111] In the washing machine described in this technology 4, the control unit stops supplying water at a water level higher than the pulsator and lower than the holding member, thereby raising the water in the washing tub to a predetermined temperature. This prevents direct contact between the object and the hot water (liquid water), and the pulsator agitates the water in the washing tub. Compared to the case where the water is not agitated using the pulsator, the agitation of the water using the pulsator increases the amount of steam generated.

[0112] (Technology 5)

[0113] In any of the above-described technologies 1 to 3, the washing machine may also include a motor for rotating the washing tub. In the steam program, the control unit controls the heater to heat the water in the outer tub to a predetermined temperature and controls the motor to rotate the washing tub at a speed that prevents the water from reaching above the holding member.

[0114] In the washing machine described in this technology 5, by rotating the washing tub after the water in the washing tub has been heated, the orientation of the object can be changed, thus enabling the steam to contact the object evenly.

[0115] (Technology 6)

[0116] In any of the above-described technologies 1 to 5, the washing machine may also include the retaining member that can be disposed within the washing tub.

[0117] (Technology 7)

[0118] The operating method of the washing machine according to Technology 7 is a method for operating a washing machine comprising: an outer tub; a washing tub rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing tub; a pulsator rotatably disposed at the lower part of the washing tub; a heater for heating water; and a control unit for controlling the water supply valve and the heater. The operating method according to Technology 7 includes: in a steam process of supplying steam to an object placed on a holding member disposed within the washing tub, the control unit controls the water supply valve to supply water to the washing tub and stops supplying water at a water level lower than that of the holding member; and in the steam process, the control unit generates steam by controlling the heater to heat the water.

[0119] In the operating method described in this technology 7, during the steam process, the control unit stops supplying water at a level lower than that of the holding member used to hold objects such as clothing, and generates steam. Therefore, steam treatment (e.g., deodorization using steam) can be performed while avoiding direct contact between the object and the hot water (liquid water) during the steam process. Thus, after the steam process, other processes such as washing the object or dehydrating the object are not required; only the steam process can be performed. Furthermore, since the object does not come into direct contact with the hot water (liquid water) during the steam process, the steam process can be performed without easily damaging the object. Additionally, since the object does not come into direct contact with the hot water (liquid water) during the steam process, the water temperature can be set to, for example, 70°C or higher during the steam process.

[0120] Industrial availability

[0121] The technology disclosed herein can be applied to vertical washing machines that have a steam program that applies steam to objects such as clothes.

[0122] Explanation of reference numerals in the attached figures

[0123] 100: Washing machine

[0124] 110: Shell

[0125] 111: Upper wall of the shell

[0126] 112: Input port

[0127] 113: Cover

[0128] 120: Outer groove

[0129] 121: Bottom of the outer groove

[0130] 123: Drainage outlet

[0131] 124: Drain pipe

[0132] 130: Drain valve

[0133] 140: Washing tub

[0134] 141: Bottom of the washing tub

[0135] 142: Through hole in the cylindrical part of the washing tank

[0136] 143: The cylindrical part of the washing tub

[0137] 150: Water Supply Department

[0138] 151: Water supply pipe

[0139] 152: Water supply valve

[0140] 160: Pulsator

[0141] 161: The base of the impeller

[0142] 162: Blades of the impeller

[0143] 163: Through hole of the impeller

[0144] 170: Suspension System

[0145] 190: Control Department

[0146] 200: Motor

[0147] 250: Heater

[0148] 300: Retaining component

[0149] 301: Base portion of retaining component

[0150] 302: Retaining the engaging part of the component

[0151] 303: Maintaining the through hole of the component

[0152] 350: Notification Department

[0153] 360: Display Panel

[0154] 400: Stop section

[0155] 450: Water level sensor

[0156] 460: Deployment of the sensor

[0157] 470: Temperature sensor

[0158] 500: Object.

Claims

1. A washing machine, comprising: Outer groove; A washing tub, which is rotatably disposed within the outer tub; A water supply valve, whose opening and closing is used to supply water to the washing tank; A pulsator is rotatably disposed at the bottom of the washing tub; A heater that heats water; and The control unit controls the water supply valve and the heater. in, The control unit is capable of executing a steam program that supplies steam to objects placed on a holding member disposed within the washing tub. In the steam process, the control unit controls the water supply valve to supply water to the washing tank and stops supplying water when the water level is lower than that of the holding member, and generates steam by controlling the heater to heat the water.

2. The washing machine according to claim 1, wherein, It also has a notification department. In the steam process, after the control unit controls the water supply valve to stop supplying water at a level lower than the holding member, it controls the notification unit to notify the object to be placed into the washing tank.

3. The washing machine according to claim 1 or 2, wherein, In the steam process, the control unit controls the water supply valve to stop the water supply at a water level that is higher than the impeller and lower than the holding member.

4. The washing machine according to claim 3, wherein, It also includes a motor for rotating the impeller. In the steam process, the control unit controls the heater to heat the water in the outer tank to a specified temperature, and controls the motor to rotate the impeller to agitate the water in the washing tank.

5. The washing machine according to claim 1 or 2, wherein, It also includes a motor for rotating the washing tub. In the steam process, the control unit controls the heater to heat the water in the outer tank to a specified temperature, and controls the motor to rotate the washing tank at a speed that prevents the water from reaching above the holding member.

6. The washing machine according to claim 1 or 2, wherein, It also includes a retaining member that can be disposed within the washing tub.

7. A method for operating a washing machine, wherein, The washing machine includes: an outer tub; a washing tub rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing tub; and a pulsator rotatably disposed at the lower part of the washing tub. A heater for heating water; and a control unit for controlling the water supply valve and the heater, the operation method comprising: In the steam process of supplying steam to an object placed on a holding member disposed within the washing tub, the control unit controls the water supply valve to supply water to the washing tub and stops supplying water when the water level is lower than that of the holding member; and In the steam process, the control unit generates steam by controlling the heater to heat the water.

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