JP6820460B2 - Washing machine and its control device - Google Patents

Description

The present invention relates to a washing machine and its control device.

A washing machine having a function of circulating water in an outer tub is known. An example of this is the washing machine of Patent Document 1, which includes a water supply channel for supplying water from a water supply source into an outer tub and an inner tub, a circulation path connecting the lower part and the upper part of the outer tub, and a circulation provided in the circulation path. It is equipped with a pump and a pulsator that stirs the water in the inner tank. This washing machine operates as follows in response to a request to start washing. First, the water supply channel is opened so that water is supplied into the outer tank. When the water supply channel is opened, water containing a washing agent is supplied into the outer tub and the inner tub. Next, when the water level in the inner tank reaches a predetermined water level, the drive of the circulation pump is started. When the circulation pump is driven, the water in the outer tank passes through the circulation path and is returned from the upper part of the outer tank to the inside of the outer tank, forming a flow of water circulating in the outer tank, the inner tank, and the circulation path. To. As the water circulates, the water in the inner tub is agitated, so that the washing agent foams and bubbles are generated in the outer tub and the inner tub.

Japanese Unexamined Patent Publication No. 7-275557

When bubbles are generated by driving a circulation pump, the distribution of bubbles in the inner tank may be greatly biased. For this reason, the plurality of washed clothes may include clothes that have not been sufficiently cleaned.

One form of the washing machine according to the present invention is an outer tub, an inner tub provided in the outer tub so as to communicate with the inside of the outer tub, and a circulation path connected to the outer tub so that water in the outer tub can be circulated. And. Further, it includes a circulation pump that forms a flow of water in the circulation path, a drive unit that drives the water in the inner tank to be agitated, and a control device that controls the circulation pump and the drive unit. Further, the control device drives the circulation pump and the drive unit during the water supply period from the start of water supply from the water supply source to the inner tub until the water level in the inner tub reaches the washing water level. Then, the drive unit is controlled so that the output of the drive unit during the water supply period becomes smaller than the output of the drive unit when the drive unit is driven after the water supply period.

According to the washing machine and its control device according to the present invention, it is possible to reduce the uneven distribution of bubbles by generating bubbles by driving the circulation pump and stirring the water in the interior by driving the drive unit, and the inner tank. The way the dirt is removed from each of the clothes inside is less likely to be uneven. In addition, it suppresses damage to clothing.

FIG. 1 is a schematic view of a washing machine according to an embodiment. FIG. 2 is a block diagram of the washing machine according to the embodiment. FIG. 3 is a perspective view showing the inside of the detergent case of the washing machine according to the embodiment. FIG. 4 is a plan view showing the inside of the outer tub and the inner tub of the washing machine according to the embodiment. FIG. 5 is a perspective view showing the circulation pump of the washing machine and its surroundings in the embodiment. FIG. 6 is an operation diagram showing the relationship between the impeller constituting the circulation pump of the washing machine and the circulation motor according to the embodiment. FIG. 7 is a diagram showing an example of the operation of the circulation pump in various washing courses of the washing machine according to the embodiment. FIG. 8 is a time chart showing an example of the operation of the washing course in the first usage state of the washing machine according to the embodiment. FIG. 9 is a time chart showing an example of the operation of the washing course in the second usage state of the washing machine according to the embodiment.

(Embodiment)
The washing machine 1 shown in FIG. 1 is a vertical washing machine used for washing clothes, and FIG. 1 shows a cross section of the washing machine 1 along a direction orthogonal to the width direction of the washing machine 1. The washing machine 1 is used by being installed on a flat installation surface such as a floor surface (not shown). The washing machine 1 is driven by electric power supplied from an external power source (not shown) such as a commercial power source. In one example, the washing machine 1 is supplied with power from the external power source to various electrical elements constituting the washing machine 1 by connecting a power cord (not shown) to an external power source.

The washing machine 1 includes a main body 10, an outer tub 20, and an inner tub 30. The main body 10 constitutes the appearance of the washing machine 1. The main body 10 includes a housing 11, a first opening 12, a main body lid 13, an operation unit 14, and a display unit 15. The housing 11 houses the outer tank 20 and the inner tank 30. An example of the material constituting the housing 11 is a metal material. An example of the shape of the housing 11 is a substantially rectangular parallelepiped. The first opening 12 is provided, for example, on the top surface 11A of the housing 11. The first opening 12 has a size that allows clothing to be taken in and out. The main body lid 13 is provided in the housing 11 so that the first opening 12 can be opened and closed.

The top surface 11A of the housing 11 includes an inclined surface 11B. The inclined surface 11B is provided on the top surface 11A, for example, on the back side of the washing machine 1 with respect to the first opening 12, and is inclined so as to be higher from the front side to the back side of the washing machine 1. The operation unit 14 and the display unit 15 are provided on, for example, an inclined surface 11B. The function of the operation unit 14 is to input various information regarding the operation of the washing machine 1. In one example, the operating unit 14 includes a function of switching the power of the washing machine 1 on and off. The function of the display unit 15 is to display various information regarding the operation of the washing machine 1.

The outer tank 20 is fixed in the housing 11 of the main body 10. The outer tub 20 includes a housing 21, a second opening 22, and an outer tub lid 23. The housing 21 houses the inner tank 30. An example of the material constituting the housing 21 is a resin material. An example of a resin material is polypropylene. An example of the shape of the housing 21 is a substantially cylindrical shape. The second opening 22 is provided on, for example, the top surface 21A of the housing 21 and faces the first opening 12. The second opening 22 has a size that allows clothing to be taken in and out. The outer tank lid 23 is provided in the housing 21 so that the second opening 22 can be opened and closed.

The inner tank 30 is provided in the outer tank 20 so as to communicate with the inside of the outer tank 20. The inner tank 30 is rotatable with respect to the outer tank 20. The inner tank 30 includes a housing 31, a third opening 32, and a plurality of communication holes 33. The housing 31 includes a storage space 31B capable of storing clothing. An example of the material constituting the housing 31 is a metal material. An example of a metallic material is stainless steel. An example of the shape of the housing 31 is a substantially cylindrical shape. The third opening 32 is provided on, for example, the top surface 31A of the housing 31 and faces the second opening 22. The third opening 32 has a size that allows clothing to be taken in and out. With the main body lid 13 and the outer tank lid 23 open, clothing is taken in and out through the first opening 12, the second opening 22, and the third opening 32. The plurality of communication holes 33 are provided on the outer peripheral surface 31C of the housing 31 so as to communicate with, for example, the accommodation space 31B and the inside of the outer tank 20.

The washing machine 1 further includes a detergent case 40, a water supply pipe 50, and a water supply hose 60. The function of the detergent case 40 is to store laundry agents, fabric softeners and the like. The detergent case 40 is provided, for example, in the housing 11 of the main body 10 above the outer tank 20. The function of the water supply pipe 50 is to supply water supplied from a water supply source (not shown) into the outer tank 20 and the inner tank 30. An example of a water source is a faucet. The water supply pipe 50 is connected to the detergent case 40 so that water is supplied into the detergent case 40, for example. The water supply pipe 50 includes a water supply valve 55 (see FIG. 2). The function of the water supply valve 55 is to adjust the amount of water supplied from the water supply pipe 50. The function of the water supply hose 60 is to supply the water supplied in the detergent case 40 into the outer tank 20 and the inner tank 30. The water supply hose 60 connects, for example, the detergent case 40 and the outer tank 20. The water flowing through the water supply pipe 50 is supplied into the detergent case 40, mixed with the washing agent and the softener in the detergent case 40 and supplied to the water supply hose 60, and is supplied to the water supply hose 60 from the water supply port 61 of the water supply hose 60 to the outer tank 20 and the inside. Water is supplied to the tank 30.

The outer tank 20 further includes an upper opening 24, a lower opening 25, and a drainage opening 26. The upper opening 24 is provided, for example, on the top surface 21A of the housing 21. The water supply hose 60 is connected to, for example, the upper opening 24 of the outer tank 20. The lower opening 25 is provided, for example, in the bottom 21B of the housing 21. The drainage opening 26 is provided, for example, in the bottom portion 21B of the housing 21.

The washing machine 1 further includes a circulation channel 70, a drainage channel 80, and a circulation pump 90. The function of the circulation pump 90 is to form a flow of water in the circulation path 70. The circulation pump 90 is provided, for example, in the circulation path 70. As detailed in FIG. 6, the circulation pump 90 includes an impeller 91, a circulation motor 92, and a case 93. The circulation motor 92 includes an output shaft 92A. The impeller 91 is provided on the output shaft 92A. The impeller 91 is housed in the case 93. The circulation pump 90 forms a flow of water in the circulation path 70 by rotating the impeller 91.

The circulation path 70 is connected to the outer tank 20 so that the water in the outer tank 20 can be circulated. The circulation path 70 is connected to, for example, an upper opening 24 and a lower opening 25. The circulation path 70 includes a first circulation path 71 and a second circulation path 72. The first circulation path 71 connects the lower opening 25 and the case 93 of the circulation pump 90. The second circulation path 72 connects the case 93 of the circulation pump 90 and the detergent case 40. In one example, the circulation path 70 is composed of a first circulation path 71, a case 93 of the circulation pump 90, a second circulation path 72, a part of the detergent case 40, and a water supply hose 60.

The drainage channel 80 is connected to the outer tank 20 so that the water in the outer tank 20 can be drained. The drainage channel 80 is connected to, for example, the drainage opening 26. The drainage channel 80 includes a first drainage valve 81. The first drain valve 81 is opened, for example, when draining water in the outer tank 20 and the inner tank 30. Since the lower opening 25 and the upper opening 24 to which the circulation path 70 is connected and the drainage opening 26 to which the drainage channel 80 is connected are individually formed, the characteristics related to running water in the circulation path 70 and drainage. The load on the design for determining the characteristics of running water in the road 80 is reduced. Characteristics related to running water include, for example, the flow rate of water flowing through the circulation channel 70 and the drainage channel 80.

The distance between the upper opening 24 and the lower opening 25 is longer than the distance between the upper opening 24 and the drainage opening 26. When the circulation pump 90 is driven, the water in the outer tank 20 flows from the lower opening 25 to the circulation path 70, and is supplied into the outer tank 20 again from the upper opening 24. Therefore, the outer tank 20, the inner tank 30, Water circulates in the circulation path 70. Since the distance between the upper opening 24 and the lower opening 25 is longer than the distance between the upper opening 24 and the drainage opening 26, the washing machine 1 is formed in the outer tub 20 and the inner tub 30 by the circulating water. The flow path becomes longer. Therefore, the water in the inner tank 30 is likely to be uniformly agitated by the circulating water.

The upper opening 24 and the lower opening 25 sandwich the center of the outer tub 20, the center of the inner tub 30, and the center of the balancer (not shown) provided in the inner tub 30 in the plan view of the washing machine 1. The function of the balancer is to balance the weight of the clothing contained in the inner tank 30. The balancer is provided in an annular shape along the edge of the third opening 32 in the inner tank 30, for example. In this configuration, since the distance between the upper opening 24 and the lower opening 25 becomes long, the flow path formed in the outer tank 20 and the inner tank 30 by the circulating water becomes long. Therefore, the water in the inner tank 30 is likely to be uniformly agitated by the circulating water.

The upper opening 24 is provided in a portion of the outer tub 20 near the back surface of the washing machine 1. The lower opening 25 is provided in the outer tub 20 near the front surface of the washing machine 1. In this configuration, the water supplied into the outer tank 20 from the upper opening 24 flows diagonally from the upper part to the lower part in the inner tank 30, so that the water in the inner tank 30 is more likely to be agitated more uniformly. Further, the drainage opening 26 is provided in a portion of the outer tub 20 near the back surface of the washing machine 1. Therefore, when the outlet (not shown) of the drainage channel 80 is pulled out to the back side of the washing machine 1, the length of the drainage channel 80 in the washing machine 1 can be shortened.

The washing machine 1 further includes a closing portion 74. The closing portion 74 is provided in the circulation path 70. The function of the closing portion 74 is to block the flow of air in the circulation path 70 when the circulation pump 90 is stopped. Since the air flow in the circulation path 70 is blocked by the closing portion 74, it is possible to prevent the moisture in the circulation path 70 from being unnecessarily returned to the outer tank 20. Further, the closing portion 74 is provided in the circulation path 70 on the downstream side of the circulation pump 90. In one example, the closure 74 is provided in the second circulation path 72. Since the flow of water in the circulation pump 90 is blocked by the closing portion 74, it is further suppressed that the water in the circulation path 70 is unnecessarily returned to the outer tank 20.

The closure 74 includes a drain trap 74A. The drain trap 74A is formed so as to be lower than the upstream side and the downstream side of the drain trap 74A in the second circulation path 72 with the washing machine 1 installed. Therefore, when the operation of the circulation pump 90 is stopped, water is accumulated in the drain trap 74A, and the air flow in the circulation path 70 is blocked. As described above, since the function of the closed portion 74 is exhibited without supplying the electric energy to the closed portion 74, the power consumption in the washing machine 1 is reduced. An example of the shape of the drain trap 74A is a substantially U-shape.

The washing machine 1 further includes a circulation drainage channel 75. The circulation drainage channel 75 connects the circulation path 70 and the drainage channel 80 so that the water in the circulation channel 70 can be drained. In one example, the circulation drainage channel 75 connects the case 93 of the circulation pump 90 and the drainage channel 80. The circulation drainage channel 75 includes a second drainage valve 76. The second drain valve 76 is closed, for example, when the circulation pump 90 is driven, and is opened so that the water in the circulation path 70 is drained when the operation of the circulation pump 90 is stopped.

The washing machine 1 further includes a pulsator 110 and a drive unit 120. The function of the pulsator 110 is to agitate the water in the inner tank 30. The pulsator 110 is provided on the bottom 31D of the housing 31 so as to be rotatable with respect to the inner tank 30, for example. In one example, the pulsator 110 is rotatably provided with the center of the inner tub 30 in the plan view of the washing machine 1 as the center of rotation. The pulsator 110 includes a plurality of blades 111 and a base 112. The plurality of blades 111 are formed on the base 112 so as to rise from the base 112. An example of the number of the plurality of blades 111 is four. An example of the shape of the blade 111 is an isosceles triangle.

The drive unit 120 is driven to agitate the water in the inner tank 30. The drive unit 120 includes a washing motor 121 and a switching unit 122 (see FIG. 2). The output shaft (not shown) of the washing motor 121 is connected to the inner tub 30 and the pulsator 110 via a switching portion 122. An example of the switching unit 122 is a clutch. When the washing motor 121 and the inner tub 30 are connected by the switching portion 122, the washing motor 121 is driven to rotate the inner tub 30 with respect to the outer tub 20. When the washing motor 121 and the pulsator 110 are connected by the switching unit 122, the washing motor 121 is driven to rotate the pulsator 110 with respect to the inner tub 30, and the water in the inner tub 30 is agitated.

The washing machine 1 further includes a drying path 130 and a dryer 140. The drying path 130 is connected to the outer tank 20 so that warm air can be supplied into the inner tank 30. In one example, the drying channel 130 connects the outer tank 20 and the drainage channel 80. The function of the dryer 140 is to dry the clothes in the inner tank 30. The dryer 140 is provided, for example, in the drying path 130. The dryer 140 is driven when the circulation pump 90 is stopped. Since the dryer 140 is driven in a state where the air flow in the circulation path 70 is blocked by the closing portion 74, the clothes can be dried efficiently.

In addition, water vapor generated from the clothes in the process of drying the clothes may pass through the circulation path 70 and leak from the outer tank 20. In one example, it is conceivable that the water vapor that has flowed into the detergent case 40 leaks from the gap formed between the detergent case 40 and its lid (not shown). In this example, the water vapor leaking from the outer tub 20 may adhere to various electrical elements constituting the washing machine 1. However, in the washing machine 1, since the water vapor generated from the clothes is blocked by the closing portion 74 in the process of passing through the circulation path 70, the possibility that the water vapor leaks from the outer tub 20 is reduced.

The dryer 140 includes a blower 141, a fan motor 142, and a heater 143 shown in FIG. The function of the blower 141 is to generate wind so that the air in the drying path 130 circulates. The blower 141 is, for example, a vortex fan having four blades. The function of the fan motor 142 is to rotate the blower 141. The output shaft (not shown) of the fan motor 142 is connected to the blower 141. The function of the heater 143 is to heat the air in the drying path 130. In one example, the heater 143 is provided on the drying path 130 downstream of the blower 141. The blower 141 is rotated by driving the fan motor 142, and the air generated by the blower 141 is heated by the heater 143 to supply warm air into the inner tank 30 via the outer tank 20.

The washing machine 1 further includes a control device 150. The control device 150 is provided, for example, in the main body 10 of the washing machine 1 (see FIG. 1). The function of the control device 150 is to control various operations related to the washing machine 1 based on the operation of the operation unit 14. The control device 150 controls, for example, the drive unit 120, the circulation pump 90, the dryer 140, the water supply valve 55, the first drain valve 81, the second drain valve 76, and the like based on the operation of the operation unit 14.

The configuration of the detergent case 40 and the water supply pipe 50 will be described with reference to FIG.

The detergent case 40 includes a first accommodating portion 41, a second accommodating portion 42, a merging flow path 43, and a merging opening 44. The function of the first storage unit 41 is to store the laundry agent. In one example, the washing agent is charged into the first storage unit 41 from the outside of the washing machine 1. The function of the second accommodating portion 42 is to accommodate the softener. In one example, the softener is charged into the second storage portion 42 from the outside of the washing machine 1. The function of the confluence 43 is to merge the water supplied from the water supply pipe 50, the washing agent contained in the first accommodating portion 41, the softener contained in the second accommodating portion 42, and the like. The confluence 43 is connected to the first accommodating portion 41 and the second accommodating portion 42. The merging opening 44 is provided on the downstream side of the merging flow path 43 and is connected to the water supply hose 60 (see FIG. 1).

The water supply pipe 50 includes a first pipe 51, a second pipe 52, a third pipe 53, and a common pipe 54. The first pipe 51, the second pipe 52, and the third pipe 53 are branched from the common pipe 54. The first pipe 51 includes a first supply port 51A. The first supply port 51A faces, for example, the first accommodating portion 41. The water flowing through the first pipe 51 is supplied to the first accommodating portion 41 through the first supply port 51A, mixed with the washing agent contained in the first accommodating portion 41, and flows into the confluence 43. The second pipe 52 includes a second supply port 52A. The second supply port 52A faces, for example, the second accommodating portion 42. The water flowing through the second pipe 52 is supplied to the second accommodating portion 42 via the second supply port 52A, mixed with the softener contained in the second accommodating portion 42, and flows into the confluence 43.

The third pipe 53 includes a shower nozzle 53A. The shower nozzle 53A faces, for example, a portion downstream of the portion that merges with the water supplied to the first accommodating portion 41 and the second accommodating portion 42 in the confluence channel 43. By supplying the water flowing through the third pipe 53 to the joint flow path 43 via the shower nozzle 53A, the water containing the washing agent, the softener and the like is likely to foam. The second circulation path 72 is connected to, for example, in the detergent case 40, a portion of the confluence flow path 43 that is downstream of the portion that merges with the water supplied from the shower nozzle 53A. When the water flowing through the second circulation path 72 merges with the water flowing through the confluence 43, the water containing the washing agent, the softener, and the like is likely to foam.

The relationship between the lower opening 25 and the drainage opening 26 will be described with reference to FIG.

The lower opening 25 and the drainage opening 26 are positioned so as to sandwich the center of the outer tub 20, the center of the inner tub 30, the center of the pulsator 110, and the center of the balancer (not shown) in the plan view of the washing machine 1. To do. In this configuration, since the distance between the lower opening 25 and the drainage opening 26 becomes longer, it is difficult for foreign matter flowed by the water flow from the drainage opening 26 toward the drainage channel 80 to flow into the lower opening 25. Therefore, it is difficult for foreign matter to enter the circulation path 70.

The area of the lower opening 25 is smaller than the area of the drainage opening 26. Therefore, foreign matter such as coins does not easily flow into the circulation path 70. An example of a coin is a coin. The circulation path 70 includes a filter 73 (see FIG. 5). The filter 73 is provided, for example, in the lower opening 25. The filter 73 is formed so that coins cannot pass through. Therefore, it is difficult for foreign matter such as coins to enter the circulation pump 90 (see FIG. 1) provided in the circulation path 70. The drainage channel 80 does not include a filter. Therefore, the resistance of water in the drainage channel 80 is reduced, and the drainage property is improved.

As shown in FIG. 5, the filter 73 includes a first hole 73A, a second hole 73B, and a connecting hole 73C that form the lower opening 25. An example of the shape of the first hole 73A in the plan view of the inner tank 30 is a circle. The shape of the second hole 73B is substantially the same as the shape of the first hole 73A. The first hole 73A and the second hole 73B are formed so that coins cannot pass through and dust separated from clothes due to washing can pass through. Since the first hole 73A and the second hole 73B are formed in the filter 73, the resistance of water in the filter 73 is reduced. Further, since the dust passes through the holes 73A and 73B, the possibility that the passage area of the circulation path 70 becomes narrow due to the accumulation of the dust is reduced.

The connecting hole 73C is formed so as to connect the first hole 73A and the second hole 73B. In this configuration, when the first portion including one end of the lint flows into the first hole 73A and the second portion including the other end of the lint flows into the second hole 73B. A third portion between the first and second portions of the lint can flow into the connecting hole 73C. Therefore, lint is less likely to be caught in the filter 73.

The impeller 91 includes a plurality of blades 91A and a base 91B. The plurality of blades 91A extend radially from the base 91B. An example of the number of the plurality of blades 91A is four. An example of the shape of the blade 91A is a rectangle. In one example, the impeller 91 is fixed to the output shaft 92A by attaching the base 91B to the output shaft 92A (see FIG. 6) of the circulation motor 92.

The configuration of the circulation motor 92 will be described with reference to FIG.

The washing machine 1 further includes an adjusting structure 100. In the adjustment structure 100, the distance between the impeller 91 and the bottom surface 93A of the case 93 when the rotation of the circulation motor 92 is stopped is narrower than the distance between the impeller 91 and the bottom surface 93A when the circulation motor 92 is rotating. The position of the impeller 91 with respect to the bottom surface 93A is adjusted so as to be. The bottom surface 93A of the case 93 is located below the impeller 91. When the portion of the case 93 facing the lower side of the impeller 91 is open, the top surface of the circulation motor 92 constitutes the bottom surface of the case 93.

The adjustment structure 100 includes a circulation motor 92. The circulation motor 92 further includes a rotor 92B and a stator 92C. The rotor 92B and the stator 92C are arranged below the bottom surface 93A of the case 93. The rotor 92B is connected to the output shaft 92A. The circulation motor 92 is driven by the stator 92C generating an electromagnetic force, and the circulation motor 92 is stopped by the stator 92C losing the electromagnetic force.

The circulation motor 92 brings the impeller 91 closer to the bottom surface 93A by moving the rotor 92B downward so as to move away from the bottom surface 93A as the stator 92C loses its electromagnetic force. Further, the circulation motor 92 is configured so that the impeller 91 can be separated from the bottom surface 93A by moving the rotor 92B upward so as to approach the bottom surface 93A as the stator 92C generates an electromagnetic force. .. In one example, when the electromagnetic force of the stator 92C disappears, the impeller 91 approaches the bottom surface 93A due to the weight of the impeller 91. The alternate long and short dash line in FIG. 6 shows the state in which the impeller 91 is close to the bottom surface 93A.

Since the distance between the impeller 91 and the bottom surface 93A when the rotation of the circulation motor 92 is stopped becomes narrow, lint is formed when a water flow is formed in the circulation path 70 while the circulation motor 92 is not rotating. It becomes difficult for dust such as dust to enter between the impeller 91 and the bottom surface 93A. Therefore, dust such as lint contained in water is unlikely to be caught in the circulation pump 90. Further, since the circulation motor 92 also serves as a drive source for rotating the impeller 91 and a mechanism for adjusting the position of the impeller 91, the configuration of the device is simplified. Further, since the mechanism for adjusting the position of the impeller 91 is configured by the relationship between the rotor 92B and the stator 92C, the configuration of the circulation motor 92 is simplified.

The circulation motor 92 is configured such that the impeller 91 comes into contact with the bottom surface 93A when the stator 92C does not generate an electromagnetic force. Therefore, when a water flow is formed in the circulation path 70 in a state where the circulation motor 92 is not rotating, dust such as lint is more difficult to enter between the impeller 91 and the bottom surface 93A.

An example of the operation of the control device 150 will be described with reference to FIG.

The control device 150 stores a plurality of washing courses related to washing clothes. The washing course includes at least the water supply period SP and the washing period WP (see FIG. 8). The water supply period SP is a period during which water is supplied from the water supply source into the inner tank 30. Specifically, the water supply period SP is a period from the start of water supply from the water supply source to the inner tank 30 until the water level of the inner tank 30 reaches the washing water level WL. The washing water level WL is, for example, the water level of the inner tub 30 suitable for washing, and is preset based on the amount of clothes accommodated in the inner tub 30. The washing period WP is a period for washing clothes in the inner tub 30 after the water supply period SP. In the plurality of washing courses, for example, the operations of the circulation pump 90 and the drive unit 120 in the water supply period SP are substantially the same, and the operations of the circulation pump 90 in the washing period WP are different from each other. The control device 150 executes a washing course selected based on the operation of the operation unit 14.

The control device 150 controls the circulation pump 90 during the water supply period SP. The water supply period SP includes a first period SP1, a second period SP2, and a third period SP3 (see FIG. 8). The first period SP1 is a period in which the circulation pump 90 is driven. The second period SP2 is a period in which the circulation pump 90 is stopped after the first period SP1 or the circulation pump 90 is driven after the first period SP1 with a driving force weaker than the driving force in the first period SP1. .. Further, the second period SP2 includes the time when the water level in the inner tub 30 reaches the washing water level WL.

In the first period SP1, the flow of water circulating in the outer tank 20, the inner tank 30, and the circulation path 70 is formed as the circulation pump 90 is driven, and bubbles are generated in the outer tank 20 and the inner tank 30. .. When the circulation pump 90 is stopped in the second period SP2, water does not circulate in the path including the circulation path 70, so that the force for generating bubbles in the outer tank 20 and the inner tank 30 is weakened. When the circulation pump 90 is driven by a weak driving force in the second period SP2, the strength of the flow of circulating water is weakened, so that bubbles are less likely to be generated in the outer tank 20 and the inner tank 30. As described above, in the second period SP2 in which the water level in the outer tank 20 and the inner tank 30 is higher than that in the first period SP1, a state in which bubbles are less likely to be generated is formed, so that bubbles may overflow from the outer tank 20. Is reduced. Further, in the washing water level WL where the water level in the outer tub 20 and the inner tub 30 is the highest, the circulation pump 90 is stopped, or the circulation pump 90 is driven by a weak driving force, so that the outer tub 20 is used. The risk of bubbles overflowing is further reduced. In one example, the second period SP2 is the period during which the circulation pump 90 is stopped after the first period SP1.

The problem of foam overflowing from the outer tub mainly occurs in washing machines including circulation channels.

The washing machine of the first example (hereinafter referred to as "first washing machine") does not include an outer tub lid and a drying path. In the first washing machine, when a large amount of bubbles are generated in the inner tub, it is considered that bubbles are accumulated on the water surface in the outer tub and the inner tub, and the bubbles overflow through the second opening of the outer tub. Be done.

The washing machine of the second example (hereinafter referred to as "second washing machine") includes an outer tub lid and does not include a drying path. Since the outer tub lid of the second washing machine is not used for confining the clothes in the inner tub and drying them with a dryer, it is necessary to let the water vapor generated from the clothes escape, so the second opening of the outer tub is more suitable for the outer tub lid. It is often not sealed or a slit is formed in the outer tank lid. Therefore, when a large amount of bubbles are generated in the inner tank, bubbles are accumulated on the water surface in the outer tank and the inner tank, and the gap between the outer tank housing and the outer tank lid or the slit of the outer tank lid is formed. It is conceivable that bubbles will overflow through.

The washing machine of the third example (hereinafter referred to as "third washing machine") includes an outer tub lid and a drying path. An example of the third washing machine is a drum type washing machine. In the third washing machine, when a large amount of bubbles are generated in the inner tub, bubbles are accumulated on the water surface in the outer tub and the inner tub, and the bubbles further overflow from the outer tub and enter the drying path. Can be considered. In this case, bubbles that have entered the drying path may adhere to the dryer.

The washing machine of the fourth example is the washing machine 1 shown in FIG. The washing machine 1 may have the same problems as the third washing machine. Further, in the washing machine 1, when a large amount of bubbles are generated in the inner tub 30, bubbles are deposited on the water surface in the outer tub 20 and the inner tub 30, and further, the bubbles are also deposited in the detergent case 40. In this case, it is conceivable that the bubbles overflowing from the outer tank 20 overflow from the gap formed between the detergent case 40 and its lid.

In the third period SP3, the circulation pump 90 is stopped before the first period SP1, or the circulation pump 90 is driven by a driving force weaker than the driving force in the first period SP1 before the first period SP1. Is. When the water level in the outer tank 20 and the inner tank 30 is low, the amount of water in the outer tank 20 and the inner tank 30 is small, so that it is difficult to efficiently generate bubbles. In the washing machine 1, the energy in the washing machine 1 is low because the circulation pump 90 stops when the water levels in the outer tub 20 and the inner tub 30 are low, or because the driving force is weak even when the circulation pump 90 is driven. The usage efficiency of is improved.

The third period SP3 includes a period from the start of water supply from the water supply source to the inside of the outer tank 20 until the inside of the circulation pump 90 is filled with water. In one example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 stops in the third period SP3. Therefore, the possibility that the operation of the circulation pump 90 is started with air contained in the circulation pump 90 is reduced.

The control device 150 controls the circulation pump 90 so that the second period SP2 is longer than the third period SP3. Since the second period SP2, in which bubbles are less likely to be generated after the first period SP1, or the second period SP2, in which bubbles are generated but the amount of bubbles generated is small, becomes longer, the risk of bubbles overflowing from the outer tank 20 is further reduced. Will be done. The lengths of the first period SP1, the second period SP2, and the third period SP3 are appropriately changed depending on, for example, the amount of clothing contained in the inner tank 30.

The control device 150 circulates so that the drive and stop of the circulation pump 90 are repeated in the first period SP1, or the state in which the driving force of the circulation pump 90 is strong and the state in which the driving force is weak is repeated in the first period SP1. Control the pump 90. If water is continuously agitated with strong force to generate bubbles, the volume of bubbles may increase sharply. In the washing machine 1, in the first period SP1 in which the circulation pump 90 is driven to generate bubbles, a state in which the drive of the circulation pump 90 is stopped or a state in which the driving force of the circulation pump 90 is weak is intermittently formed. Therefore, the possibility of bubbles overflowing from the outer tank 20 is reduced. In one example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is repeatedly driven and stopped in the first period SP1 when the amount of clothing contained in the inner tank 30 is larger than a predetermined amount. .. Whether or not the amount of clothes accommodated in the inner tub 30 is larger than a predetermined amount is determined based on the load acting on the washing motor 121 when the pulsator 110 is rotated.

The control device 150 controls the operation of the pulsator 110 by driving the drive unit 120 during the water supply period SP. Bubbles are generated in the outer tank 20 and the inner tank 30 by driving the circulation pump 90 in the water supply period SP, and the water in the inner tank 30 is agitated by the rotation of the pulsator 110. Therefore, the uneven distribution of the bubbles generated in the outer tank 20 and the inner tank 30 is reduced, and the dirt is less likely to be removed from the clothes in the inner tank 30.

The control device 150 drives the drive unit 120 while driving the circulation pump 90 during the water supply period SP. Since the state in which water is circulated by the circulation pump 90 and the state in which water is agitated by the rotation of the pulsator 110 are formed together, bubbles are efficiently generated. The control device 150 starts driving the circulation pump 90 and the drive unit 120 after the start time of the water supply period SP. In one example, the control device 150 maintains the state in which the drive unit 120 is stopped in the third period SP3, and starts driving the drive unit 120 in the first period SP1. Since the circulation pump 90 and the drive unit 120 are not driven when the water level in the inner tank 30 is low, the risk of damaging clothing due to contact with the pulsator 110 that rotates when the drive unit 120 is driven is reduced.

The control device 150 stops driving the circulation pump 90 and the drive unit 120 during the water supply period SP. In one example, the control device 150 stops driving the drive unit 120 in the second period SP2. When the drive of the circulation pump 90 and the drive unit 120 is stopped, water does not circulate, so that bubbles are less likely to be generated in the outer tank 20 and the inner tank 30. Therefore, the possibility of bubbles overflowing from the outer tank 20 is reduced.

The length of the period from the time when the drive unit 120 is stopped in the middle of the water supply period SP to the end time of the water supply period SP of the control device 150 is longer than the length of the period during which the drive unit 120 is driven in the water supply period SP. The drive unit 120 is controlled so as to be longer. In one example, the control device 150 controls the drive unit 120 so that the second period SP2 is longer than the period during which the drive unit 120 is driven in the first period SP1. Therefore, the possibility of bubbles overflowing from the outer tank 20 is further reduced.

The control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is smaller than the output of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. In one example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is smaller than the output of the drive unit 120 during the washing period WP. Since the output of the drive unit 120 is small in the water supply period SP in which the water level in the inner tub 30 is lower than the washing period WP, damage to clothes due to contact with the pulsator 110 is suppressed.

The control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 during the water supply period SP is lower than the maximum rotation speed of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. In one example, the control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 during the water supply period SP is lower than the maximum rotation speed of the drive unit 120 during the washing period WP. The rotation speed of the drive unit 120 has a correlation with the rotation speed of the pulsator 110. Therefore, even if the pulsator 110 comes into contact with the clothing as the drive unit 120 is driven, the rotation speed of the pulsator 110 is low, so that the clothing is less likely to be damaged. The control device 150 controls the drive unit 120 so that the drive unit 120 is continuously driven, for example, during the washing period WP.

An example of the operation of the circulation pump 90 in the washing period WP of various washing courses will be described with reference to FIG. 7. The numerical values shown in parentheses in FIG. 7 indicate the time during which the circulation pump 90 is driven or stopped. The unit of time is seconds.

The control device 150 controls the circulation pump 90 so that the driving state and the stopping state of the circulation pump 90 are included in the washing period WP in various washing courses. When the circulation pump 90 is driven during the washing period WP, a flow of water circulating in the outer tub 20, the inner tub 30, and the circulation path 70 is formed, and bubbles are generated in the outer tub 20 and the inner tub 30. When the circulation pump 90 is stopped during the washing period WP, water does not circulate in the path including the circulation path 70, so that the force for generating bubbles in the outer tub 20 and the inner tub 30 is weakened. As described above, since the state in which bubbles are difficult to be generated is formed during the washing period WP, the possibility that bubbles overflow from the outer tub 20 is reduced.

The control device 150 controls the circulation pump 90 so that the period for driving the circulation pump 90 is longer than the period for stopping the circulation pump 90 in the washing period WP in various washing courses. Therefore, an amount of foam suitable for washing is likely to be generated during the washing period WP. The control device 150 stops the circulation pump 90 in the latter half period including the end time of the washing period WP in various washing courses. In the latter half of the washing period WP, when the clothes are roughly cleaned, the amount of foam generated has a small effect on the finish of washing the clothes. Therefore, by stopping the circulation pump 90 during the latter half of the washing period WP, it is possible to reduce the possibility of bubbles overflowing from the outer tub 20 while suppressing the influence on the finish of washing clothes.

The washing period WP includes a first washing period WP1 and a second washing period WP2 (see FIG. 8). The first washing period WP1 is a period in which the output of the drive unit 120 is relatively high. The second washing period WP2 is a period in which the output of the drive unit 120 is relatively low. The control device 150 controls the circulation pump 90 so that the first washing period WP1 includes a state in which the circulation pump 90 is driven, and the second washing period WP2 includes a state in which the circulation pump 90 is stopped. By driving the circulation pump 90 during the first washing period WP1 in which the output of the drive unit 120 is high, the amount of foam generated becomes larger. For this reason, the ability to remove stains on clothing becomes stronger. The amount of foam generated is further reduced by stopping the circulation pump 90 during the second washing period WP2 when the output of the drive unit 120 is low. Therefore, the possibility of bubbles overflowing from the outer tank 20 is reduced.

The control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 in the second washing period WP2 is lower than the maximum rotation speed of the drive unit 120 in the first washing period WP1. Therefore, the amount of foam generated in the second washing period WP2 is further reduced, and the possibility of foam overflowing from the outer tub 20 is further reduced. The control device 150 controls the drive unit 120 so that the second washing period WP2 includes the end point of the washing period WP. Therefore, by driving the drive unit 120 with a low output during the second washing period WP2 including the end time of the washing period WP, bubbles overflow from the outer tub 20 while suppressing the influence on the finish of washing clothes. The risk can be reduced. In one example, the control device 150 controls the drive unit 120 in the second washing period WP2 in order to separate a plurality of clothes housed in the inner tub 30.

The control device 150 controls the circulation pump 90 so that the first washing period WP1 includes a state in which the circulation pump 90 is driven and a state in which the circulation pump 90 is stopped. In one example, the circulation pump 90 is stopped at the end of the first washing period WP1. As the time for the circulation pump 90 to be continuously driven becomes longer, the volume of bubbles on the water surface in the inner tank 30 increases, and the possibility that the bubbles overflow from the outer tank 20 increases. When the circulation pump 90 is continuously driven for a long time in the first washing period WP1 in which the output of the drive unit 120 is high, the possibility becomes higher. In the washing machine 1, since the first washing period WP1 in which the output of the drive unit 120 is high includes a state in which the circulation pump 90 is driven and stopped, it is avoided that the circulation pump 90 is continuously driven for a long time, and the outside is prevented. The risk of bubbles overflowing from the tank 20 is reduced.

Multiple washing courses include long and short courses. The long course is a washing course with a relatively long washing period WP. The long course includes, for example, a first washing course, a second washing course, and a third washing course. In the long course, the washing period WP is longer in the order of the first washing course, the second washing course, and the third washing course. The short-time course is a washing course with a relatively short washing period WP. The short course includes, for example, a fourth washing course, a fifth washing course, a sixth washing course, a seventh washing course, and an eighth washing course. The short-time course has the longest washing period WP in the order of the 4th washing course, the 5th washing course, the 6th washing course, the 7th washing course, and the 8th washing course. In the eighth washing course, the circulation pump 90 is not driven during the washing period WP.

The control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the long course is longer than the period for stopping the circulation pump 90 in the short course. The period during which the control device 150 stops the circulation pump 90 is the total time during which the circulation pump 90 is stopped during the washing period WP. Since the period for stopping the circulation pump 90 is long in the long course, the possibility of bubbles overflowing from the outer tub 20 is reduced even when the washing period WP is relatively long.

The control device 150 controls the circulation pump 90 so that the circulation pump 90 is intermittently driven in the long course. In one example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is intermittently driven in the first washing course and the second washing course of the long-time course. When the circulation pump 90 is intermittently driven, a series of operations in which the circulation pump 90 is driven and then stopped are repeated. In a series of operations when the circulation pump 90 is intermittently driven, the time when the circulation pump 90 is stopped is set based on the time when the circulation pump 90 is driven. In a series of operations when the circulation pump 90 is intermittently driven, when the circulation pump 90 is driven for a relatively long time, it is preferable that the circulation pump 90 is stopped for a relatively long time in order to suppress foaming. ..

In one example, the control device 150 drives the circulation pump 90 for 400 seconds in the first washing course, then stops the circulation pump 90 for 120 seconds, then drives the circulation pump 90 for 30 seconds, and then the circulation pump 90. The circulation pump 90 is controlled so that the circulation pump 90 is stopped for 120 seconds, then the circulation pump 90 is driven for 30 seconds, and then the circulation pump 90 is stopped for 200 seconds. Since the circulation pump 90 is intermittently driven, the period during which the circulation pump 90 is stopped becomes long, so that the possibility of bubbles overflowing from the outer tub 20 is reduced even when the washing period WP is relatively long.

The drive time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven is shorter than the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to. Further, in the control device 150, the drive time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven is longer than the stop time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be short. Since the bubbles generated in the outer tank 20 and the inner tank 30 are deposited on the water surface in the inner tank 30, as the driving time of the circulation pump 90 becomes longer during the period in which the circulation pump 90 is intermittently driven, the bubbles are placed on the water surface. The volume of bubbles increases. In the washing machine 1, since the driving time of the circulation pump 90 is shortened in the latter half period, the amount of foam generated is suppressed, and the possibility of foam overflowing from the outer tub 20 is reduced.

In one example, the control device 150 has the last drive time of the circulation pump 90 in the period in which the circulation pump 90 is intermittently driven, the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven, and the first half. The circulation pump 90 is controlled so as to be shorter than the stop time of the circulation pump 90 during the period. Since the driving time of the final circulation pump 90 is shortened, the amount of bubbles generated is further suppressed, and the possibility of bubbles overflowing from the outer tank 20 is further reduced.

In the control device 150, the stop time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven is longer than the drive time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to. In one example, the control device 150 circulates so that the stop time of the last circulation pump 90 during the period when the circulation pump 90 is intermittently driven is longer than the drive time of the last circulation pump 90 during the period when the circulation pump 90 is intermittently driven. Control the pump 90. Since the stop time of the final circulation pump 90 is long, the amount of bubbles generated is suppressed, and the possibility of bubbles overflowing from the outer tank 20 is reduced.

The control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the washing period WP becomes longer as the length of the long course becomes longer. Therefore, the possibility of bubbles overflowing from the outer tank 20 in the long-time course is further reduced. The control device 150 controls the circulation pump 90 so that the state in which the circulation pump 90 is intermittently driven is not included in the short-time course. Therefore, when the circulation pump 90 is driven in the short-time course, the possibility that the amount of bubbles generated is reduced is reduced.

The control device 150 executes a washing course selected based on, for example, the operation of the operation unit 14. In one example, the control device 150 controls the drive unit 120 so that the pulsator 110 rotates at a predetermined rotation speed before executing the washing course, and is housed in the inner tub 30 based on the load acting on the washing motor 121. Determine the amount of laundry. When the control device 150 determines that the amount of clothes contained in the inner tub 30 is less than a predetermined amount, the control device 150 executes the washing course in the first use state described below. When the control device 150 determines that the amount of clothes contained in the inner tub 30 is larger than the predetermined amount, the control device 150 executes the washing course in the second use state described below.

An example of the first usage state of the washing machine 1 will be described with reference to FIG. FIG. 8 shows an example of the operation of the first washing course in the first used state.

At time t1, the control device 150 controls the water supply valve 55 so that water is supplied from the water supply source into the outer tank 20 and the inner tank 30 with a predetermined water supply amount via the water supply pipe 50, the detergent case 40, and the like. An example of a predetermined water supply amount is 15 L / min. The water supplied into the outer tub 20 and the inner tub 30 contains a washing agent, a softener and the like. The water level in the inner tank 30 continues to rise while being supplied from the water supply source. Further, the control device 150 controls the switching unit 122 so that the washing motor 121 and the inner tub 30 are connected by the switching unit 122, and controls the washing motor 121 so that the inner tub 30 rotates at a predetermined rotation speed. .. An example of a predetermined rotation speed is 35 rpm. When the inner tank 30 rotates at a predetermined rotation speed, a plurality of clothes housed in the inner tank 30 are separated. The control device 150 does not drive the circulation pump 90 in the third period SP3 including the period from time t1 to time t2.

At time t2, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. The control device 150 continues to drive the circulation pump 90 in the first period SP1 including the period from time t2 to time t3. Therefore, bubbles are likely to be generated in the outer tank 20 and the inner tank 30. Further, at time t2, the control device 150 controls the washing motor 121 so that the rotation of the inner tub 30 is stopped, and then controls the switching unit 122 so that the washing motor 121 and the pulsator 110 are connected by the switching unit 122. Then, the washing motor 121 is controlled so that the pulsator 110 rotates at the first rotation speed RS1. An example of the first rotation speed RS1 is 110 rpm.

At time t3, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops. The control device 150 maintains the state in which the circulation pump 90 is stopped in the second period SP2 including the period from the time t3 to the time t4. Further, at time t3, the control device 150 controls the washing motor 121 so that the rotation of the pulsator 110 is stopped. In the second period SP2, in which the water level in the outer tank 20 and the inner tank 30 is higher than that in the first period SP1, the circulation pump 90 and the drive unit 120 are stopped, so that bubbles are generated in the outer tank 20 and the inner tank 30. A state that is difficult to generate is formed. Therefore, the possibility of bubbles overflowing from the outer tank 20 is reduced.

At time t4, the control device 150 determines that the water level of the inner tank 30 has reached the washing water level WL, and controls the water supply valve 55 so that the water supply from the water supply source to the outer tank 20 and the inner tank 30 is stopped. The washing water level WL is the highest water level in the inner tub 30 in the washing course. The washing water level WL is set according to the amount of clothes contained in the inner tub 30. Further, the control device 150 controls the washing motor 121 so that the pulsator 110 rotates at the second rotation speed RS2. An example of the second rotation speed RS2 is 120 rpm. The control device 150 detects the amount of water (hereinafter referred to as “flying water”) flying from the water surface in the inner tank 30 by rotating the pulsator 110 at the second rotation speed RS2, for example. When the amount of flying water is larger than a predetermined amount, there is a high possibility that bubbles generated in the outer tank 20 and the inner tank 30 will overflow from the outer tank 20. In one example, when the control device 150 determines that the amount of flying water is larger than a predetermined amount, a part of the water in the outer tub 20 and the inner tub 30 is drained, or the washing course is stopped.

At time t5, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. The control device 150 controls the circulation motor 92 so that the circulation pump 90 is intermittently driven during the washing period WP in the first washing course. Further, the control device 150 controls the washing motor 121 so that the pulsator 110 rotates at the third rotation speed RS3. An example of the third rotation speed RS3 is 130 rpm. The control device 150 controls the washing motor 121 so that the pulsator 110 continues to rotate at the third rotation speed RS3 in the first washing period WP1 including the period from time t5 to time t11. The washing machine 1 starts washing the clothes housed in the inner tub 30 after time t5.

At time t6, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops. At time t7, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. At time t8, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops. At time t9, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. At time t10, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops. The control device 150 maintains the state in which the circulation pump 90 is stopped after the time t10 in the washing period WP. Since the washing period WP includes a state in which the circulation pump 90 is driven and a state in which the circulation pump 90 is stopped, a state in which bubbles are unlikely to be generated is formed in the washing period WP. Therefore, the possibility of bubbles overflowing from the outer tank 20 is reduced.

At time t11, the control device 150 controls the washing motor 121 so that the pulsator 110 rotates at the fourth rotation speed RS4. An example of the fourth rotation speed RS4 is 80 rpm. When the pulsator 110 rotates at the fourth rotation speed RS4, the clothes housed in the inner tank 30 are separated. At time t12, the control device 150 controls the washing motor 121 so that the rotation of the pulsator 110 is stopped. Further, the control device 150 controls the drain valves 76 and 81 so that the water in the outer tank 20 and the inner tank 30 is drained. Through the above steps, the control device 150 ends the first washing course in the first used state.

The control device 150 performs at least one of a rinsing step, a dehydrating step, and a drying step, for example, after the end of various washing courses. In one example, the control device 150 executes a rinsing step, a dehydration step, and a drying step in this order.

The rinsing step is a step of rinsing the clothes contained in the inner tank 30. In one example, in the rinsing process, the control device 150 controls the water supply valve 55 so that water is supplied again from the water supply source into the outer tank 20 and the inner tank 30, and the inner tank 30 is washed so as to rotate at a predetermined rotation speed. After controlling the motor 121, the drain valves 76 and 81 are controlled so that the water in the outer tank 20 and the inner tank 30 is drained. An example of a predetermined rotation speed is 780 rpm. When the control device 150 executes the rinsing step, dirt or bubbles adhering to the clothes are washed away.

The dehydration step is a step of dehydrating the clothes contained in the inner tank 30. In one example, in the dehydration step, the control device 150 controls the washing motor 121 so that the inner tub 30 rotates at a predetermined rotation speed in a state where the water in the outer tub 20 and the inner tub 30 is drained. An example of a predetermined rotation speed is 780 rpm. When the control device 150 executes the dehydration step, the clothes contained in the inner tank 30 are dehydrated.

The drying step is a step of drying the clothes housed in the inner tank 30. In one example, the control device 150 controls the fan motor 142 and the heater 143 so that warm air is supplied into the inner tank 30 in the drying step. When the control device 150 executes the drying step, the clothes housed in the inner tank 30 are dried.

Next, an example of the second usage state of the washing machine 1 will be described with reference to FIG. FIG. 9 shows an example of the operation of the first washing course in the second used state.

At time t21, the control device 150 executes substantially the same processing as that executed at time t1 (see FIG. 8). The control device 150 does not drive the circulation pump 90 in the third period SP3 including the period from time t21 to time t22.

At time t22, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. The control device 150 controls the circulation motor 92 so that the circulation pump 90 is repeatedly driven and stopped in the first period SP1 including the period from the time t22 to the time t25. At time t23, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops.

At time t24, the control device 150 controls the circulation motor 92 so that the circulation pump 90 is driven. Further, the control device 150 controls the washing motor 121 so that the rotation of the inner tub 30 is stopped, and then controls the switching unit 122 so that the washing motor 121 and the pulsator 110 are connected by the switching unit 122, and the pulsator 110 is connected. Controls the washing motor 121 so that it rotates at the first rotation speed RS1. At time t25, the control device 150 controls the circulation motor 92 so that the circulation pump 90 stops. The control device 150 maintains the state in which the circulation pump 90 is stopped during the second period SP2 from the time t25 to the time t26. Further, the control device 150 controls the washing motor 121 so that the rotation of the pulsator 110 is stopped.

The control device 150 executes substantially the same processing at times t26 to t34 as the processing executed at times t4 to t12 (see FIG. 8). Through the above steps, the control device 150 ends the first washing course in the second used state.

An example of how to use the washing machine 1 will be described with reference to FIG.

The washing machine 1 is used by a user, for example, as follows. In the first procedure, the main body lid 13 and the outer tank lid 23 are opened, and clothing is put into the accommodation space 31B of the inner tank 30 through the openings 12, 22, and 32. In the second procedure, the laundry agent, the softener and the like are housed in the detergent case 40. In the third procedure, the power of the washing machine 1 is set to be turned on by operating the operation unit 14, and an arbitrary washing course is selected.

The washing machine 1 executes the washing course selected by the third procedure. The control device 150 controls the circulation pump 90 so as to include a state in which the circulation pump 90 is driven and a state in which the circulation pump 90 is stopped in the water supply period SP of the washing course. Therefore, a state in which bubbles are less likely to be generated is formed during the water supply period SP, and the possibility of bubbles overflowing from the outer tank 20 is reduced. Further, the control device 150 controls the circulation pump 90 so as to include a state in which the circulation pump 90 is driven and a state in which the circulation pump 90 is stopped in the washing period WP of the washing course. Therefore, a state in which bubbles are less likely to be generated is formed during the washing period WP, and the possibility of bubbles overflowing from the outer tub 20 is reduced. Then, after the clothes housed in the inner tub 30 are washed, the washed clothes are taken out from the storage space 31B of the inner tub 30 in the fourth procedure.

(Modification example)
The description of the embodiments is an example of possible embodiments of the washing machine and its control device according to the present invention, and is not intended to limit the embodiments. In addition to the embodiments, the present invention may take, for example, a modification of the embodiment shown below and a combination of at least two variants that do not contradict each other.

-The control content in the first period SP1 of the water supply period SP can be changed arbitrarily. In the first example, the control device 150 controls the circulation pump 90 so that the driving force of the circulation pump 90 is repeatedly strong and weak in the first period SP1. In the second example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 continues to be driven in the first period SP1 when the amount of clothing accommodated in the inner tank 30 is larger than a predetermined amount. In the third example, when the amount of clothing contained in the inner tank 30 is less than a predetermined amount, the control device 150 uses the circulation pump 90 so that the circulation pump 90 is repeatedly driven and stopped in the first period SP1. Control.

-The control content in the second period SP2 of the water supply period SP can be changed arbitrarily. In one example, the control device 150 controls the circulation pump 90 in the second period SP2 so that the circulation pump 90 is driven by a driving force weaker than the driving force in the first period SP1.

-The control content in the third period SP3 of the water supply period SP can be changed arbitrarily. In one example, the control device 150 controls the circulation pump 90 in the third period SP3 so that the circulation pump 90 is driven by a driving force weaker than the driving force in the first period SP1.

-The relationship between the second period SP2 and the third period SP3 in the water supply period SP can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 so that the second period SP2 and the third period SP3 have substantially the same length. In the second example, the control device 150 controls the circulation pump 90 so that the second period SP2 is shorter than the third period SP3.

-The contents of the third period SP3 of the water supply period SP can be changed arbitrarily. In the first example, the third period SP3 includes a period from the start of water supply from the water supply source to the inside of the outer tank 20 to the time when the inside of the circulation pump 90 is filled with water. In the second example, the third period SP3 includes a period from the start of water supply from the water supply source to the inside of the outer tank 20 until the water level of the inner tank 30 reaches a predetermined water level. An example of a preferable range for a predetermined water level is 15 to 25 mm. An example of a predetermined water level is 22 mm.

-The configuration of the water supply period SP can be changed arbitrarily. In the first example, the first period SP1 is omitted from the water supply period SP. According to this example, the control device 150 does not drive the circulation pump 90 during the water supply period SP. In the second example, at least one of the second period SP2 and the third period SP3 is omitted from the water supply period SP.

The relationship between the length of the period from the time when the drive unit 120 is stopped in the middle of the water supply period SP to the end of the water supply period SP and the length of the period in which the drive unit 120 is driven in the water supply period SP is arbitrary. Can be changed to. In the first example, the length of the period from the time when the drive unit 120 is stopped in the middle of the water supply period SP to the end time of the water supply period SP is the length of the period in which the drive unit 120 is driven in the water supply period SP. The drive unit 120 is controlled so as to be substantially the same as the length of the period. In the second example, the length of the period from the time when the drive unit 120 is stopped in the middle of the water supply period SP to the end time of the water supply period SP is the length of the period in which the drive unit 120 is driven in the water supply period SP. The drive unit 120 is controlled so as to be shorter than the length of the period.

The relationship between the maximum rotation speed of the drive unit 120 during the water supply period SP and the maximum rotation speed of the drive unit 120 when the drive unit 120 is driven after the water supply period SP can be arbitrarily changed. In the first example, in the control device 150, the maximum rotation speed of the drive unit 120 during the water supply period SP is substantially the same as the maximum rotation speed of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. Controls the drive unit 120. In the second example, the control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 during the water supply period SP is substantially the same as the maximum rotation speed of the drive unit 120 during the washing period WP. In the third example, the control device 150 drives the control device 150 so that the maximum rotation speed of the drive unit 120 during the water supply period SP is higher than the maximum rotation speed of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. Control 120. In the fourth example, the control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 during the water supply period SP is higher than the maximum rotation speed of the drive unit 120 during the washing period WP.

The relationship between the output of the drive unit 120 during the water supply period SP and the output of the drive unit 120 when the drive unit 120 is driven after the water supply period SP can be arbitrarily changed. In the first example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is substantially the same as the output of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. To control. In the second example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is substantially the same as the output of the drive unit 120 during the washing period WP. In the third example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is larger than the output of the drive unit 120 when the drive unit 120 is driven after the water supply period SP. .. In the fourth example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 during the water supply period SP is larger than the output of the drive unit 120 during the washing period WP.

The relationship between the driving state of the circulation pump 90 and the driving state of the driving unit 120 in the water supply period SP can be arbitrarily changed. In one example, the control device 150 drives the drive unit 120 with the circulation pump 90 stopped during the water supply period SP.

The driving state of the driving unit 120 in the water supply period SP can be arbitrarily changed. In the first example, the control device 150 controls the drive unit 120 so that the drive unit 120 continues to be driven during the water supply period SP. In the second example, the control device 150 controls the drive unit 120 so that the drive unit 120 maintains the stopped state during the water supply period SP.

-The period for stopping the circulation pump 90 in the washing period WP can be arbitrarily changed. In the first example, the control device 150 stops the circulation pump 90 during the first half period including the start time of the washing period WP. In the second example, the control device 150 stops the circulation pump 90 during the washing period WP.

-The relationship between the period for driving the circulation pump 90 and the period for stopping the circulation pump 90 in the washing period WP can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 in the washing period WP so that the period for driving the circulation pump 90 is substantially the same as the period for stopping the circulation pump 90. In the second example, the control device 150 controls the circulation pump 90 in the washing period WP so that the period for driving the circulation pump 90 is shorter than the period for stopping the circulation pump 90.

-The relationship between the period for stopping the circulation pump 90 in the long course and the period for stopping the circulation pump 90 in the short course can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the long course is substantially the same as the period for stopping the circulation pump 90 in the short course. In the second example, the control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the long course is shorter than the period for stopping the circulation pump 90 in the short course.

-The relationship between the period for stopping the circulation pump 90 in the washing period WP and the length of the long course can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the washing period WP is substantially the same in the long course. In the second example, the control device 150 controls the circulation pump 90 so that the period for stopping the circulation pump 90 in the washing period WP becomes shorter as the length of the long course increases.

The relationship between the drive time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven and the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven is arbitrarily changed. It is possible. In the first example, the control device 150 drives the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven, and the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be substantially the same as the time. In the second example, the control device 150 drives the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven, and the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be longer than the time. Similar modifications are made to the relationship between the drive time of the circulation pump 90 in the latter half of the period in which the circulation pump 90 is intermittently driven and the stop time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The example holds.

The relationship between the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven and the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven can be arbitrarily changed. .. In the first example, in the control device 150, the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is substantially the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be the same. In the second example, the control device 150 has a drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven more than the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be long. A similar modification holds for the relationship between the last drive time of the circulation pump 90 in the period in which the circulation pump 90 is intermittently driven and the stop time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. To do.

The relationship between the stop time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven and the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven can be arbitrarily changed. In the first example, the control device 150 has substantially the same stop time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven as the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven. The circulation pump 90 is controlled so as to be. In the second example, the control device 150 makes the stop time of the last circulation pump 90 during the period when the circulation pump 90 is intermittently driven shorter than the drive time of the last circulation pump 90 during the period when the circulation pump 90 is intermittently driven. Controls the circulation pump 90.

-Whether or not the circulation pump 90 is intermittently driven during the washing period WP can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is intermittently driven in all the washing courses of the long-term course. In the second example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is intermittently driven in the short course. In the third example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is not intermittently driven.

-Whether or not the state in which the circulation pump 90 is driven and the state in which the circulation pump 90 is stopped is included in the washing period WP can be arbitrarily changed. In the first example, the control device 150 continues to drive the circulation pump 90 during the washing period WP. In the second example, the control device 150 keeps the circulation pump 90 stopped during the washing period WP.

The relationship between the maximum rotation speed of the drive unit 120 in the second washing period WP2 and the maximum rotation speed of the drive unit 120 in the first washing period WP1 can be arbitrarily changed. In the first example, the control device 150 sets the drive unit 120 so that the maximum rotation speed of the drive unit 120 in the second washing period WP2 is substantially the same as the maximum rotation speed of the drive unit 120 in the first washing period WP1. Control. In the second example, the control device 150 controls the drive unit 120 so that the maximum rotation speed of the drive unit 120 in the second washing period WP2 is higher than the maximum rotation speed of the drive unit 120 in the first washing period WP1.

The relationship between the output of the drive unit 120 in the second washing period WP2 and the output of the drive unit 120 in the first washing period WP1 can be arbitrarily changed. In the first example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 in the second washing period WP2 is substantially the same as the output of the drive unit 120 in the first washing period WP1. In the second example, the control device 150 controls the drive unit 120 so that the output of the drive unit 120 in the second washing period WP2 is higher than the output of the drive unit 120 in the first washing period WP1.

-The configuration of the dryer 140 can be changed arbitrarily. In one example, the dryer 140 includes a heat pump instead of the heater 143. The washing machine 1 may take a form in which the dryer 140 and the drying path 130 are omitted.

The configuration of the adjustment structure 100 can be arbitrarily changed. In one example, the adjustment structure 100 includes, instead of the circulation motor 92, another mechanism that can adjust the position of the impeller 91. An example of another mechanism is a ball screw. The washing machine 1 may take a form in which the adjustment structure 100 is omitted.

The configuration of the circulation motor 92 can be arbitrarily changed. In one example, the circulation motor 92 is configured so that the impeller 91 does not come into contact with the bottom surface 93A of the case 93 when the stator 92C does not generate electromagnetic force. Therefore, when the stator 92C of the circulation motor 92 does not generate an electromagnetic force, a gap is formed between the impeller 91 and the bottom surface 93A.

-The configuration of the closed portion 74 can be arbitrarily changed. In the first example, the closing portion 74 is provided in the circulation path 70 on the upstream side of the circulation pump 90. In the second example, the closure 74 includes a solenoid valve in place of the drain trap 74A. The washing machine 1 may take a form in which the closing portion 74 is omitted.

-The configuration of the filter 73 can be arbitrarily changed. In the first example, the filter 73 includes at least one hole in place of or in addition to the connecting hole 73C. It is preferable that at least one hole is formed so that coins cannot pass through and dust separated from clothes during washing can pass through. In the second example, at least one of the first hole 73A, the second hole 73B, and the connecting hole 73C is omitted from the filter 73.

-The configuration of the circulation path 70 can be arbitrarily changed. In one example, the circulation path 70 is connected to the upper opening 24 and the lower opening 25 without the detergent case 40 and the water supply hose 60. According to this example, the second circulation path 72 connects the case 93 of the circulation pump 90 and the outer tank 20.

-The position of the upper opening 24 in the outer tank 20 can be arbitrarily changed. In the first example, the upper opening 24 is provided in the outer tub 20 near the front of the washing machine 1. In the second example, the upper opening 24 is provided in the outer tub 20 near the center of the washing machine 1. In the third example, the upper opening 24 is provided on the outer peripheral surface of the outer tank 20.

-The position of the lower opening 25 in the outer tank 20 can be arbitrarily changed. In the first example, the lower opening 25 is provided in the outer tub 20 near the back surface of the washing machine 1. In the second example, the lower opening 25 is provided in the outer tub 20 near the center of the washing machine 1. In the third example, the lower opening 25 is provided on the outer peripheral surface of the outer tank 20.

-The position of the drainage opening 26 in the outer tank 20 can be arbitrarily changed. In the first example, the drainage opening 26 is provided in the outer tub 20 near the front of the washing machine 1. In the second example, the drainage opening 26 is provided in the outer tub 20 near the center of the washing machine 1. In the third example, the drainage opening 26 is provided on the outer peripheral surface of the outer tank 20.

The relationship between the distance between the upper opening 24 and the lower opening 25 and the distance between the upper opening 24 and the drainage opening 26 can be arbitrarily changed. In the first example, the distance between the upper opening 24 and the lower opening 25 is substantially the same as the distance between the upper opening 24 and the drainage opening 26. In the second example, the distance between the upper opening 24 and the lower opening 25 is shorter than the distance between the upper opening 24 and the drainage opening 26.

-The relationship between the area of the lower opening 25 and the area of the drainage opening 26 can be arbitrarily changed. In the first example, the area of the lower opening 25 is substantially the same as the area of the drainage opening 26. In the second example, the area of the lower opening 25 is larger than the area of the drainage opening 26.

The washing machine 1 may take a form in which at least one of the circulation pump 90 and the pulsator 110 is omitted. When the circulation pump 90 is omitted in the washing machine 1, the circulation path 70 can also be omitted. When the pulsator 110 is omitted, the washing machine 1 agitates the water in the inner tub 30 by rotating the inner tub 30 with respect to the outer tub 20 as the drive unit 120 is driven.

-The configuration of the washing machine 1 can be changed arbitrarily. In one example, the washing machine 1 is a drum-type washing machine. The configuration of the drum-type washing machine is substantially the same as the configuration of the washing machine 1.

As described above, the washing machine in the first disclosure is the outer tub, the inner tub provided in the outer tub so as to communicate with the inside of the outer tub, and the outer tub so that the water in the outer tub can be circulated. It has a circulation path to be connected. It also includes a circulation pump that forms a flow of water in the circulation path, a drive unit that drives to agitate the water in the inner tank, and a control device that controls the circulation pump and the drive unit. Further, the control device drives the circulation pump and the drive unit during the water supply period from the start of water supply from the water supply source to the inner tub until the water level in the inner tub reaches the washing water level.

Bubbles are generated by driving the circulation pump, and the water in the interior is agitated by driving the drive unit to reduce the uneven distribution of bubbles, which causes unevenness in how dirt is removed from each clothing in the inner tank. It becomes difficult.

In the first disclosure, the washing machine in the second disclosure may drive the drive unit in a state where the control device drives the circulation pump during the water supply period.

Since the state in which water is circulated by the circulation pump and the state in which water is agitated by the drive unit are combined, bubbles are efficiently generated.

In the first disclosure, the washing machine in the third disclosure may allow the control device to start driving the circulation pump and the drive unit after the start of the water supply period.

Since the circulation pump and the drive unit are not driven when the water level in the inner tank is low, the risk of damaging clothing due to contact with a stirring member including a pulsator that operates when the drive unit is driven is reduced.

In the second disclosure, the washing machine in the fourth disclosure may start driving the circulation pump and the drive unit after the start time of the water supply period.

Bubbles are efficiently generated, and the circulation pump and drive unit are not driven when the water level in the inner tank is low. Therefore, the clothes are damaged by contact with a stirring member including a pulsator that operates by driving the drive unit. The risk of this is reduced.

In any of the first to fourth disclosures, the washing machine in the fifth disclosure may have the control device stop driving the circulation pump and the drive unit in the middle of the water supply period.

Since the circulation pump and the drive unit are stopped, a state in which bubbles are unlikely to be generated is formed in the outer tank and the inner tank. Therefore, the risk of bubbles overflowing from the outer tank is reduced.

In the fifth disclosure, the washing machine in the sixth disclosure is driven in the water supply period by the length of the period from the time when the control device stops driving the drive unit in the middle of the water supply period to the end of the water supply period. The drive unit may be controlled so as to be longer than the length of the period during which the unit is driven.

Since the period in which the circulation pump and the drive unit are stopped is long, a state in which bubbles are unlikely to be generated is formed in the outer tank and the inner tank for a long time. Therefore, the risk of bubbles overflowing from the outer tank is reduced.

In the first disclosure, the washing machine according to the seventh disclosure is such that the output of the drive unit during the water supply period is smaller than the output of the drive unit when the drive unit is driven after the water supply period. May be controlled.

By reducing the output of the drive unit during the water supply period when the water level in the inner tank is lower than after the water supply period, there is a risk that clothing may be damaged due to contact with the stirring member including the pulsator that operates when the drive unit is driven. It will be reduced.

In the eighth disclosure, in the seventh disclosure, the maximum rotation speed of the drive unit during the water supply period is lower than the maximum rotation speed of the drive unit when the drive unit is driven after the water supply period. The drive unit may be controlled in this way.

By lowering the maximum rotation speed of the drive unit during the water supply period when the water level in the inner tank is lower than after the water supply period, the clothing is damaged by contact with the stirring member including the pulsator that operates by driving the drive unit. The risk is reduced.

In the seventh disclosure or the eighth disclosure, the washing machine in the ninth disclosure may be a washing period for washing clothes in the inner tub after the water supply period.

Sufficient washing capacity can be expected by making the output of the drive unit larger than the output of the water supply period in the washing period after the water supply period.

The washing machine and the control device thereof according to the present invention can be used for various washing machines including household and commercial use.

1 Washing machine 20 Outer tank 30 Inner tank 70 Circulation path 90 Circulation pump 120 Drive unit 150 Control device SP Water supply period WL Washing water level WP Washing period

Claims (8)

With the outer tank
An inner tank provided in the outer tank so as to communicate with the inside of the outer tank,
A circulation path connected to the outer tank so that water in the outer tank can be circulated,
A circulation pump that forms a flow of water in the circulation path,
A drive unit that drives to agitate the water in the inner tank,
A control device for controlling the circulation pump and the drive unit is provided.
The control device drives the circulation pump and the driving unit during the water supply period from the start of water supply from the water supply source to the inner tank until the water level of the inner tank reaches the washing water level, and the water supply period. A washing machine that controls the drive unit so that the output of the drive unit is smaller than the output of the drive unit when the drive unit is driven after the water supply period . The washing machine according to claim 1, wherein the control device drives the driving unit while driving the circulation pump during the water supply period. The washing machine according to claim 1, wherein the control device starts driving the circulation pump and the driving unit after the start time of the water supply period. The washing machine according to claim 2, wherein the control device starts driving the circulation pump and the driving unit after the start time of the water supply period. The washing machine according to any one of claims 1 to 4, wherein the control device stops driving the circulation pump and the driving unit during the water supply period. In the control device, the length of the period from the time when the drive of the drive unit is stopped in the middle of the water supply period to the end of the water supply period is the length of the period during which the drive unit is driven in the water supply period. The washing machine according to claim 5, wherein the driving unit is controlled so as to be longer than that. The control device controls the drive unit so that the maximum rotation speed of the drive unit during the water supply period is lower than the maximum rotation speed of the drive unit when the drive unit is driven after the water supply period. Item 1. The washing machine according to item 1 . The washing machine according to any one of claims 1 to 7, which is a washing period for washing clothes in the inner tank after the water supply period.

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