Washing machine and method of operating a washing machine

Abstract

The present application 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 such as laundry when steam is applied to the object 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 for supplying steam to an object accommodated in the washing tub, and 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 higher than a bottom surface of the washing tub and lower than an upper surface of the pulsator, 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] 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.

[0010] Solution for solving the problem

[0011] The washing machine disclosed herein includes: an outer tub; a washing basin rotatably disposed within the outer tub; a water supply valve for opening and closing a flow path for supplying water to the washing basin; a pulsator rotatably disposed at the lower part of the washing basin; 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 contained in the washing basin. In this steam program, the control unit controls the water supply valve to supply water to the washing basin and stops supplying water at a water level higher than the bottom surface of the washing basin and lower than the upper surface of the pulsator, and generates steam by controlling the heater to heat the water.

[0012] 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 for supplying steam to an object contained in 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 higher than the bottom surface of the washing tub and lower than the upper surface of the pulsator; and in the steam process, the control unit generates steam by controlling the heater to heat the water.

[0013] Invention Effects

[0014] 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

[0015] Figure 1 This is a schematic cross-sectional view of the washing machine according to the implementation method.

[0016] Figure 2 This is a top view of the outer tub, washing tub, and pulsator of the aforementioned washing machine.

[0017] Figure 3 This is a side view of the aforementioned impeller.

[0018] Figure 4 This is a diagram showing the sequence of steam programs performed by the washing machine described above.

[0019] Figure 5 This is a schematic diagram illustrating the internal state of the washing machine during the steam process described above.

[0020] Figure 6 This is a flowchart illustrating the water supply process of the above-mentioned steam procedure.

[0021] Figure 7 This is a flowchart illustrating the steam process of the above-described steam procedure. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] [Overall structure of the washing machine]

[0025] 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-inch impeller.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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. The washing tub 140 has a bottom surface 145. This bottom surface 145 is the upper surface of the bottom 141 of the washing tub 140. Objects such as clothing 500 (see below) Figure 5 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.

[0031] 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.

[0032] One or more through holes 144 may be formed at the bottom 141 of the washing tank 140. In this case, water in the washing tank 140 can flow into the space between the bottom 121 of the outer tank 120 and the bottom 141 of the washing tank 140 through the one or more through holes 144. Additionally, water in the space between the bottom 121 of the outer tank 120 and the bottom 141 of the washing tank 140 can flow into the washing tank 140 through the one or more through holes 144. Therefore, in the steam process, water in the outer tank 120 heated by the heater 250 can flow into the washing tank 140 through the one or more through holes 144. Furthermore, in the steam process, if water in the outer tank 120 heated by the heater 250 can flow into the washing tank 140 through the through hole 142 formed at the lower part of the cylindrical portion 143 of the washing tank 140, the bottom 141 of the washing tank 140 may not need to have through holes 144.

[0033] 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 1 As 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.

[0034] 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.

[0035] 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, configured to rotate about a vertically extending axis of rotation. During the steam cycle, the pulsator 160 rotates, thereby ensuring that steam evenly contacts the object 500 contained within the washing tub 140 and disposed on the pulsator 160.

[0036] The specific structure of the impeller 160 is not particularly limited; for example, the impeller 160 may also have... Figure 2 and Figure 3The structure is as shown. The impeller 160 has an upper surface 165. During the steam process, objects 500 such as clothing are placed on the upper surface 165 of the impeller 160.

[0037] The impeller 160 may also have a base portion 161 that is circular when viewed from above and multiple blades 162. The base portion 161 has an upper surface 165a. The upper surface 165a 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 upward from the base portion 161. Each of the multiple blades 162 has an upper surface 165b. That is, the upper surface 165 of the impeller 160 includes the upper surface 165a of the base portion 161 and the upper surfaces 165b of the multiple blades 162.

[0038] 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, during a steam process, steam generated between the bottom surface 145 of the washing tank 140 and the impeller 160 can reach the object 500 disposed on the impeller 160 through these through holes 163. Furthermore, during a steam process, if steam can reach the object 500 disposed on the impeller 160 through, for example, through a through hole 142 formed in the lower part of the washing tank 140, the impeller 160 may not need to have through holes 163.

[0039] The washing tub 140 and the impeller 160 are each driven by a motor 200.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 example, the heater 250 may also be installed at the bottom of the washing tub 140. The operation of the heater 250 is controlled by the control unit 190.

[0044] 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.

[0045] 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.

[0046] exist Figure 1In 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] [The actions of the washing machine]

[0052] 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 4-7 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 4-7 The same process is used to execute the steam process, as shown.

[0053] Figure 4 It is a diagram showing the sequence of the deodorization process. Figure 5 This is a schematic diagram illustrating the internal state of the washing machine 100 during the deodorization process. Figure 6 This is a flowchart illustrating the water supply process for the deodorization procedure. Figure 7 This is a flowchart illustrating the steam process of the deodorization procedure.

[0054] like Figure 4 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 contained in the washing tub 140 and placed on the impeller 160 using steam, the control unit 190 controls the water supply valve 152 to supply water to the washing tub 140 and stops supplying water at a water level higher than the bottom surface 145 of the washing tub 140 and lower than the upper surface 165 of the impeller 160. After stopping the water supply, the control unit 190 controls the heater 250 to heat the water to generate steam.

[0055] 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 upper surface 165 of the impeller 160, and stops supplying water when the water level is lower than the upper surface 165 of the impeller 160. Afterwards, after the object 500 is placed into the washing tub 140, 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 upper surface 165 of the impeller 160, 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 hot water during the deodorization process, the deodorization process can be performed without easily causing damage to the object 500. Also, 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. Furthermore, since steam is generated at a water level higher than the bottom surface 145 of the washing tub 140 and lower than the upper surface 165 of the impeller 160, steam can be generated within the washing tub 140, and the amount of water used in the deodorization process and the electricity required to heat the water can be controlled. Therefore, steam can be generated efficiently.

[0056] The water level at which the water supply is stopped during the deodorization process (the deodorization process water level) can be, for example, higher than the bottom surface 145 of the washing tub 140 and lower than the upper surface 165a of the base portion 161 of the impeller 160. Alternatively, the deodorization process water level can also be, for example, higher than the bottom surface 145 of the washing tub 140 and lower than the lowest part of the upper surface 165a of the base portion 161 of the impeller 160. Alternatively, the deodorization process water level can also be, for example, higher than the lowest part of the bottom surface 145 of the washing tub 140 and lower than the lowest part of the upper surface 165a of the base portion 161 of the impeller 160.

[0057] An example of the height position h1 of the bottom surface 145 of the washing tub 140 is shown in... Figure 1 The reference numeral h1 is used to indicate the height position h2 of the upper surface 165 of the impeller 160. Figure 1 The height position h2 is indicated by the reference numeral h2 in the attached drawing. In this specific example, the height position h2 is the height position of the upper surface 165a of the base portion 161 of the impeller 160. An example of the water level h3 where the water supply is stopped during the deodorization process is shown in... Figure 1 The water level is indicated by the reference numeral h3 in the attached diagram. This water level h3 is higher than the elevation position h1 and lower than the elevation position h2.

[0058] exist Figure 5The process of the washing machine 100 in the deodorization program is roughly divided into six steps. Figure 5 Steps 1 and 2 are included in the water supply process. Figure 5 Steps 3, 4, 5 and 6 are included in the steam process.

[0059] like Figure 4 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 1 The 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 4 as well as Figure 6 The control of the water supply process, which is described as "start of operation" in the text, is the beginning of the deodorization process.

[0060] 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.

[0061] exist Figure 6 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.

[0062] Next, in Figure 6 S102 ( Figure 5 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 5As shown in step 2, when the water level in the washing tub 140 (i.e., the water level in the outer tub 120) reaches or exceeds a preset threshold value, namely the water level threshold T1, the control unit 190 determines that the water supply to the washing tub 140 has been completed and controls the water supply valve 152 to stop the water supply to the washing tub 140. The water level threshold T1 is a value corresponding to a water level (e.g., water level h3) that is higher than the bottom surface 145 of the washing tub 140 and lower than the upper surface 165 of the impeller 160 (e.g., the upper surface 165a of the base portion 161).

[0063] Next, in Figure 6 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.

[0064] Next, in Figure 6 In 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.

[0065] Next, in Figure 6 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 6 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.

[0066] Next, in Figure 6 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.

[0067] The determination in step S106 can also be performed as follows. For example, when the user is in... Figure 5 After placing the object 500 into the washing tub 140 and placing it on the impeller 160 as shown in step 2, and then performing the operation of moving the lid 113 from the open position to the closed position (i.e., closing the lid 113), the placement 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 placed into the washing tub 140 based on the detection result input from the placement 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 placed 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 placed into the washing tub 140 based on this input. In this case, the placement determination sensor 460 can be omitted in the washing machine 100.

[0068] exist Figure 6 In step S107, the control unit 190 locks the cover 113 in the state where the inlet 112 is closed (the aforementioned closed position) and ends the water supply process.

[0069] Next, the control unit 190 performs the function of... Figure 7 The control of the steam process is shown.

[0070] exist Figure 5 Step 3 and Figure 7 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.

[0071] exist Figure 7 In step S202, the control unit 190 controls the agitation of the water in the washing tank 140 by rotating the washing tank 140. Step S202 is a process for heating and agitating the water (rotation of the heating tank). By rotating the heating tank, the temperature deviation between the water in the washing tank 140 and the water located between the outer tank 120 and the washing tank 140 is reduced. Specifically, in step S202, the control unit 190 may also control the motor 200 to rotate the washing tank 140 and the impeller 160 together.

[0072] 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.

[0073] exist Figure 7 In 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 5 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.

[0074] 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.

[0075] The control unit 190 may also control the motor 200 to rotate the washing tub 140 in step S204 after controlling the heater 250 to heat the water in the outer tub 120 to a predetermined temperature ("Yes" in step S203). That is, it may also be possible for the control unit 190 to control the motor 200 to rotate the washing tub 140 in step S204 after the water temperature measured by the temperature sensor 470 reaches the temperature threshold T2 ("Yes" in step S203). In this case, the washing tub 140 and the impeller 160 may rotate together. The rotation of the washing tub 140 agitates the water within it. That is, it is possible to agitate the water within the washing tub 140 while supplying steam to the object 500. Compared to the case where water agitation is not performed by rotating the washing tub 140, agitation of the water by rotating the washing tub 140 increases the amount of steam generated. Furthermore, in Figure 7 In step S204, the agitation of water by rotating the washing tank 140 is described as "steam tank rotation".

[0076] The rotational speed of the washing tub 140 in step S204 is not particularly limited, but it 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 smaller 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 S204 can also be switched to the opposite direction at predetermined intervals.

[0077] The rotational speed of the washing tub 140 in step S204 can also be set to a speed that prevents the water in the washing tub 140 from reaching a height above the upper surface 165 of the impeller 160 (e.g., the upper surface 165a of the base portion 161) due to the rotation of the washing tub 140. The rotational speed that prevents the water from reaching a height above the upper surface 165 of the impeller 160 is a value related to the water level in the washing tub 140, and can be preset using methods such as experiments or simulations.

[0078] While the exact principle behind increasing steam generation through water agitation (steam tank rotation) caused by the rotation of the washing tank 140 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 at the lower part of the washing tank 140 is more likely to be higher than the temperature at the upper part. Furthermore, water loses heat from its surroundings during evaporation, so the area near the water surface (water surface) within the washing tank 140 is more likely to lose heat due to evaporation. Consequently, the aforementioned temperature difference is easily generated. However, if the water is agitated by rotating the washing tank 140, this temperature difference is reduced. In other words, compared to the case where water agitation is not performed by rotating the washing tank 140, the temperature of the area near the surface (water surface) of the water in the washing tank 140 where steam is generated increases by performing water agitation by rotating the washing tank 140. It is believed that this helps to increase the amount of steam generated compared to the case where the water is not stirred by rotating the washing tank 140.

[0079] The control unit 190 can either continuously perform the processing of step S204 (steam tank rotation) until the steam process is completed, or it can intermittently perform the processing of step S204 during the steam process.

[0080] Furthermore, in step S204, when the water in the washing tub 140 is heated to a predetermined temperature (temperature threshold T2), i.e., when deodorization using steam is in progress, the control unit 190 controls the motor 200 to rotate the washing tub 140, thereby changing the orientation of the object 500. This allows the steam to contact the object 500 evenly.

[0081] 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 impeller 160 in step S205. That is, it is also possible 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 S205. Specifically, the control unit 190 can also control the motor 200 to rotate the impeller 160 without rotating the washing tub 140.

[0082] The rotational speed of the impeller 160 in step S205 (impeller rotation) 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 lower value than the rotational speed of the impeller 160 in the washing program described above (e.g., 50 rpm). The rotation direction of the impeller 160 in step S205 can also be switched to the opposite direction at predetermined intervals.

[0083] By heating the water in the outer tank 120 (the water in the washing tank 140) to a predetermined temperature (temperature threshold T2), i.e., while deodorizing using steam is in progress, the impeller 160 is rotated, thereby changing the orientation of the object 500. This allows the steam to contact the object 500 evenly.

[0084] The control unit 190 may, for example, alternately perform the processing of step S204 (steam tank rotation) and the processing of step S205 (impeller rotation). Specifically, the control unit 190 may continue to rotate the washing tank 140 until the elapsed time from the time point when the rotation of the washing tank 140 begins in step S204 reaches a predetermined time threshold T3. When the elapsed time reaches the time threshold T3, the rotation of the washing tank 140 ends, and the processing of step S205 (impeller rotation) begins. Then, the control unit 190 may continue to rotate the impeller 160 until the elapsed time from the time point when the rotation of the impeller 160 begins reaches a predetermined time threshold T4. When the elapsed time reaches the time threshold T4, the rotation of the impeller 160 ends.

[0085] 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 tank rotation) and step S205 (impeller 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.

[0086] Alternatively, the control unit 190 may determine whether to terminate the steam process, for example, as follows. Figure 4 When 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.

[0087] 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.

[0088] (Modified Example)

[0089] The washing machine described in this disclosure is not limited to the above-described embodiments, but includes, for example, the following variations.

[0090] 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.

[0091] In the above embodiment, during the deodorization process, after the control unit 190 stops supplying water at a water level higher than the bottom surface 145 of the washing tank 140 and lower than the upper surface 165 of the impeller 160, 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.

[0092] 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 steam tank that rotates the washing tank 140 (step S204). However, the timing of starting the rotation of the steam tank is not limited to the specific example described in the above embodiment. That is, the timing of starting the rotation of the steam 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.

[0093] 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 impeller 160 (step S205). However, the timing of starting the impeller rotation is not limited to the specific example described in the above embodiment. That is, the timing of starting the impeller rotation 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.

[0094] In addition, Figure 7 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.

[0095] Furthermore, as a specific example 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 a through hole (e.g., at least one of through hole 142 and through hole 144). 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.

[0096] 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 6After 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 (e.g., supplying water to the space between the outer tub 120 and the washing tub 140), water supply can be performed with the object 500 placed on the upper surface 165 of the impeller 160. In this case, with the object 500 placed on the upper surface 165 of the impeller 160, water is supplied to the outer tub 120, and the water in the outer tub 120 flows into the washing tub 140 through the aforementioned through-hole. In this second method, the notification from the notification unit 350 prompting the insertion of the object 500 into the washing tub 140 can be omitted, performed before the water supply begins, or performed during the water supply.

[0097] As explained above, the washing machine in this disclosure includes the following technologies 1 to 6.

[0098] (Technology 1)

[0099] The washing machine according to Technology 1 includes: an outer tub; a washing tub rotatably disposed within 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 at the lower part of the washing tub; a heater (e.g., a heater for heating water accumulated in the outer tub) for heating water; and a control unit that controls the water supply valve and the heater, wherein the control unit is capable of executing a steam program for supplying steam to an object contained in 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 higher than the bottom surface of the washing tub and lower than the upper surface of the pulsator, and generates steam by controlling the heater to heat the water.

[0100] In the washing machine described in this technology 1, during the steam program, the control unit stops supplying water at a water level lower than the upper surface of the pulsator, generating steam. Therefore, steam-based treatment (e.g., deodorization) can be performed while preventing direct contact between the object and the hot water (liquid water) during the steam program. Thus, after the steam program, other programs such as washing or dehydrating the object are unnecessary; only the steam program can be performed. Furthermore, since the object does not directly contact the hot water (liquid water) during the steam program, it can be performed without causing damage to the object. Also, because the object does not directly contact the hot water (liquid water) during the steam program, the water temperature can be set to, for example, 70°C or higher. Moreover, since steam is generated at a water level higher than the bottom of the washing tub and lower than the upper surface of the pulsator, steam can be generated within the washing tub, and the amount of water used in the steam program and the electricity required to heat the water can be controlled. Therefore, steam can be generated efficiently.

[0101] (Technology 2)

[0102] In the washing machine described in 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 upper surface of the impeller, the notification unit controls the notification unit to notify the user to put the object into the washing tub.

[0103] 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 upper surface of the impeller, 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 with water, it can be treated with steam (e.g., deodorized with steam) without being wetted in the washing tub.

[0104] (Technology 3)

[0105] In the washing machine described in Technology 1 or Technology 2, a motor may also be included, which is used to rotate 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 stirs the water accumulated in the outer tub by controlling the motor to rotate the washing tub.

[0106] In the washing machine described in this technology 3, the amount of steam generated can be increased by agitating the water by rotating the washing tub, compared to the case where water is not agitated by rotating the washing tub.

[0107] (Technology 4)

[0108] In any of the 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 water from reaching above the upper surface of the impeller.

[0109] In the washing machine described in this technology 4, by rotating the washing tub after the water in the outer tub has been heated, the orientation of the object can be changed, thus enabling the steam to contact the object evenly.

[0110] (Technology 5)

[0111] In any of the technologies 1 to 4, the washing machine may also include a motor for rotating 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 controls the motor to rotate the impeller.

[0112] In the washing machine described in this technology 5, by rotating the impeller after the water in the outer tub has been heated, the orientation of the object can be changed, thus enabling the steam to contact the object evenly.

[0113] (Technology 6)

[0114] The operating method of the washing machine according to Technology 6 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 includes: in a steam process for supplying steam to an object contained in 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 higher than the bottom surface of the washing tub and lower than the upper surface of the pulsator; and in the steam process, the control unit generates steam by controlling the heater to heat the water.

[0115] In the operating method described in this technology 6, during the steam program, the control unit stops supplying water at a level lower than the upper surface of the impeller, generating 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 program. Thus, after the steam program, other programs such as washing or dehydrating the object are unnecessary; only the steam program can be performed. Furthermore, since the object does 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 object. Additionally, since the object does 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. Moreover, since water is supplied up to a level higher than the bottom of the washing tub and lower than the upper surface of the impeller, steam can be generated within the washing tub, and the amount of water used in the steam program and the electricity required to heat the water can be controlled. Therefore, steam can be generated efficiently.

[0116] Industrial availability

[0117] The technology disclosed herein can be applied to vertical washing machines that have a steam program that applies steam to objects such as clothes.

[0118] Explanation of reference numerals in the attached figures

[0119] 100: Washing machine

[0120] 110: Shell

[0121] 111: Upper wall of the shell

[0122] 112: Input port

[0123] 113: Cover

[0124] 120: Outer groove

[0125] 121: Bottom of the outer groove

[0126] 123: Drainage outlet

[0127] 124: Drain pipe

[0128] 130: Drain valve

[0129] 140: Washing tub

[0130] 141: Bottom of the washing tub

[0131] 142: Through hole in the cylindrical part of the washing tank

[0132] 143: The cylindrical part of the washing tub

[0133] 144: Through hole at the bottom of the washing tub

[0134] 145: Bottom surface of the washing tub

[0135] 150: Water Supply Department

[0136] 151: Water supply pipe

[0137] 152: Water supply valve

[0138] 160: Pulsator

[0139] 161: The base of the impeller

[0140] 162: Blades of the impeller

[0141] 163: Through hole of the impeller

[0142] 165: Upper surface of the impeller

[0143] 165a: The upper surface of the base portion of the impeller

[0144] 165b: Upper surface of the impeller blades

[0145] 170: Suspension System

[0146] 190: Control Department

[0147] 200: Motor

[0148] 250: Heater

[0149] 350: Notification Department

[0150] 360: Display Panel

[0151] 450: Water level sensor

[0152] 460: Deployment of the sensor

[0153] 470: Temperature sensor

[0154] 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 process to supply steam to the objects contained in the washing tank. In the steam process, the control unit controls the water supply valve to supply water to the washing tank and stops supplying water at a water level that is higher than the bottom surface of the washing tank and lower than the upper surface of the impeller, 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 program, after the control unit controls the water supply valve to stop supplying water at a level lower than the upper surface of the impeller, it controls the notification unit to notify the user to add the object into the washing tank.

3. 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 to agitate the water accumulated in the outer tank.

4. 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 water from reaching above the upper surface of the impeller.

5. The washing machine according to claim 1 or 2, 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.

6. 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 the object contained in 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 higher than the bottom surface of the washing tub and lower than the upper surface of the impeller; and In the steam process, the control unit generates steam by controlling the heater to heat the water.

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