CN109983171B - Washing machine - Google Patents

Abstract

A washing machine (1) is provided with: an outer tank (20) having an upper opening (24), a lower opening (25), and a drain opening (26); an inner tank (30) provided in the outer tank (20) so as to communicate with the inside of the outer tank (20); and a circulation path (70), wherein the circulation path (70) is connected to the outer tank (20) in such a manner that water in the outer tank (20) can circulate. Further, the apparatus comprises: a drainage path (80), wherein the drainage path (80) is connected to the outer tank (20) so as to be able to drain water in the outer tank (20); and a circulation pump (90) for forming a flow of water in the circulation path (80). The circulation path (70) is connected to the lower opening (25) and the upper opening (24), and the drain path (80) is connected to the drain opening (26).

Description

Washing machine

Technical Field

The present invention relates to a washing machine.

Background

A washing machine having a function of circulating water in an outer tub is known. A washing machine of patent document 1 as an example of the washing machine includes: a common path connected to an opening provided at the bottom of the outer tub, a circulation path and a drain path branched from the common path, a valve provided in the drain path, and a circulation pump provided in the middle of the circulation path. The downstream part of the circulation path is connected to an opening part provided at the upper part of the outer tub. When the circulation pump is driven, the water in the outer tank is circulated from the opening of the outer tank to the upper part of the outer tank through the common path and the circulation path. In case that the valve of the drain path is opened, the water in the outer tub is discharged to the outside of the washing machine through the common path and the drain path.

Patent document 1: japanese laid-open patent publication No. 2007-29205

Disclosure of Invention

Since the circulation path and the drainage path are branched from the common path, the design load of the common path structure that affects the characteristics of the flowing water in the circulation path and the characteristics of the flowing water in the drainage path is large.

One embodiment of a washing machine according to the present invention includes: an outer tank including an upper opening, a lower opening, and a drain opening; an inner tank provided in the outer tank so as to communicate with the inside of the outer tank; and a circulation path connected to the outer tank so as to circulate water in the outer tank. Further, the apparatus comprises: a drainage path connected to the outer tank so as to be able to drain water in the outer tank; and a circulation pump for forming a flow of water in the circulation path. The circulation path is connected to the lower opening and the upper opening, and the drain path is connected to the drain opening.

According to the washing machine of the present invention, the burden of design for determining the characteristics related to the running water in the circulation path and the characteristics related to the running water in the drain path can be reduced. The characteristics related to the flowing water include, for example, the flow rate of water flowing through the circulation path and the drain path.

Drawings

Fig. 1 is a schematic view of a washing machine of an embodiment.

Fig. 2 is a block diagram of the washing machine of the embodiment.

Fig. 3 is a perspective view of the detergent box of the washing machine according to the embodiment.

Fig. 4 is a plan view showing the outer tub and the inner tub of the washing machine according to the embodiment.

Fig. 5 is a perspective view showing a circulation pump of the washing machine of the embodiment and its periphery.

Fig. 6 is an operation diagram showing a relationship between an impeller and a circulation motor constituting a circulation pump of the washing machine 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 timing chart showing an example of the operation of the washing program in the first use state of the washing machine according to the embodiment.

Fig. 9 is a timing chart showing an example of the operation of the washing program in the second use state of the washing machine according to the embodiment.

Detailed Description

(embodiment mode)

The washing machine 1 shown in fig. 1 is a vertical type washing machine for washing laundry, and fig. 1 shows a section of the washing machine 1 along a direction orthogonal to a width direction of the washing machine 1. The washing machine 1 is installed on a flat installation surface such as a floor (not shown) and used. The washing machine 1 is driven by electric power supplied from an external power supply (not shown) such as a commercial power supply. In one example, a power supply line (not shown) of the washing machine 1 is connected to an external power supply, and thereby, electric power of the external power supply is supplied to various electric components constituting the washing machine 1.

The washing machine 1 includes a main body 10, an outer tub 20, and an inner tub 30. The main body 10 constitutes an external appearance of the washing machine 1. The main body 10 includes a housing 11, a first opening 12, a main body cover 13, an operation portion 14, and a display portion 15. The housing 11 houses an outer tank 20 and an inner tank 30. An example of the material constituting the housing 11 is a metal material. One 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 the laundry to be taken in and out. The main body cover 13 is provided to the housing 11 in such a manner as to be able to open and close the first opening 12.

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

The outer tub 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 cover 23. The housing 21 accommodates the inner tank 30. An example of the material constituting the case 21 is a resin material. An example of the resin material is polypropylene. One example of the shape of the housing 21 is a substantially cylindrical shape. The second opening 22 is provided on the top surface 21A of the housing 21, for example, and faces the first opening 12. The second opening 22 has a size capable of taking in and out the laundry. An outer slot cover 23 is provided to the housing 21 in such a manner as to be able to open and close the second opening 22.

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 relative 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 housing space 31B capable of housing laundry. An example of the material constituting the case 31 is a metal material. An example of the metal material is stainless steel. One example of the shape of the housing 31 is a substantially cylindrical shape. The third opening 32 is provided on the top surface 31A of the housing 31, for example, and faces the second opening 22. The third opening 32 has a size that allows the laundry to be taken in and out. In a state where the body cover 13 and the outer tub cover 23 are opened, the laundry is taken out and put in through the first opening 12, the second opening 22, and the third opening 32. The plurality of communication holes 33 are provided in the outer peripheral surface 31C of the housing 31 so as to communicate the housing space 31B with the inside of the outer tank 20, for example.

The washing machine 1 further includes a detergent box 40, a water supply pipe 50, and a water supply hose 60. The detergent box 40 functions to contain detergent, softener, and the like. Detergent box 40 is provided, for example, in housing 11 of main body 10 at a position above outer tub 20. The water supply pipe 50 functions to supply water supplied from a water supply source (not shown) into the outer and inner tanks 20 and 30. An example of the water supply source is a faucet. The water supply pipe 50 is connected to the detergent box 40, for example, to supply water into the detergent box 40. The water supply pipe 50 includes a water supply valve 55 (refer to fig. 2). The water supply valve 55 functions to adjust the amount of water supplied from the water supply pipe 50. The water supply hose 60 functions to supply water supplied into the detergent box 40 into the outer tub 20 and the inner tub 30. The water supply hose 60 connects the detergent box 40 with the outer tub 20, for example. The water flowing through the water supply pipe 50 is supplied into the detergent box 40, mixed with the detergent, the softener, and the like in the detergent box 40, and supplied into the water supply hose 60, so that the water is supplied from the water supply port 61 of the water supply hose 60 into the outer tub 20 and the inner tub 30.

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

Washing machine 1 further includes circulation path 70, drain path 80, and circulation pump 90. The circulation pump 90 functions to form a flow of water in the circulation path 70. The circulation pump 90 is provided in the circulation path 70, for example. As shown in detail in fig. 6, the circulation pump 90 includes an impeller 91, a circulation motor 92, and a casing 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 a casing 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 water in the outer tank 20 can circulate. The circulation path 70 is connected to, for example, the upper opening 24 and the 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 to the casing 93 of the circulation pump 90. The second circulation path 72 connects the housing 93 of the circulation pump 90 with the detergent box 40. In one example, circulation path 70 is composed of first circulation path 71, casing 93 of circulation pump 90, second circulation path 72, a part of detergent box 40, and water supply hose 60.

The drain path 80 is connected to the outer tank 20 so that water in the outer tank 20 can be drained. The drain passage 80 is connected to the drain opening 26, for example. The drain path 80 includes a first drain valve 81. The first drain valve 81 is opened, for example, when water in the outer tank 20 and the inner tank 30 is to be drained. Since the lower opening 25 and the upper opening 24 connected to the circulation path 70 are formed separately from the drain opening 26 connected to the drain path 80, the load of design for determining the characteristics related to the flowing water in the circulation path 70 and the characteristics related to the flowing water in the drain path 80 can be reduced. The characteristics related to the flowing water include, for example, the flow rate of the water flowing through the circulation path 70 and the drain path 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 drain opening 26. When the circulation pump 90 is driven, the water in the outer tub 20 flows from the lower opening 25 to the circulation path 70, and is supplied again to the outer tub 20 from the upper opening 24, so that the water circulates through the outer tub 20, the inner tub 30, and the circulation path 70. Since the distance between the upper opening 24 and the lower opening 25 of the washing machine 1 is longer than the distance between the upper opening 24 and the drain opening 26, the path of the running water formed in the outer tub 20 and the inner tub 30 by the circulating water becomes long. Therefore, the water in the inner tank 30 is easily uniformly stirred by the circulating water.

In a plan view of washing machine 1, upper opening 24 and lower opening 25 sandwich the center of outer tub 20, the center of inner tub 30, and the center of a balancer (not shown) provided in inner tub 30. The balancer functions to balance the weight of the laundry accommodated in the inner tub 30. The balancer is provided in a ring shape, for example, along the rim of the third opening 32 of the inner tank 30. In this configuration, since the distance between the upper opening 24 and the lower opening 25 is long, the path of the flowing water formed in the outer tank 20 and the inner tank 30 by the circulating water is long. Therefore, the water in the inner tank 30 is easily uniformly stirred by the circulating water.

Upper opening 24 is provided in outer tub 20 at a portion closer to the rear surface of washing machine 1. Lower opening 25 is provided in outer tub 20 at a portion closer to the front surface of washing machine 1. In this configuration, the water supplied from the upper opening 24 into the outer tank 20 flows in the inner tank 30 in an inclined manner from the upper portion toward the lower portion, and therefore, the water in the inner tank 30 is more easily and uniformly stirred. Further, drain opening 26 is provided in a portion of outer tub 20 on the back surface of washing machine 1. Therefore, when the outlet (not shown) of the drain passage 80 is drawn out to the back side of the washing machine 1, the length of the drain passage 80 in the washing machine 1 can be shortened.

The washing machine 1 further includes a closing portion 74. The closing part 74 is provided in the circulation path 70. The function of the closing part 74 is to shut off the flow of air in the circulation path 70 in the case where the circulation pump 90 is stopped. Since the flow of air in the circulation path 70 is blocked by the blocking portion 74, the water in the circulation path 70 can be prevented from being unnecessarily returned to the outer tub 20. The closing portion 74 is provided on the downstream side of the circulation pump 90 in the circulation path 70. In one example, the closing part 74 is provided in the second circulation path 72. Since the flow of the water in circulation pump 90 is blocked by blocking portion 74, the water in circulation path 70 can be further prevented from unnecessarily returning to outer tub 20.

The enclosure 74 includes a drain trap 74A. The drain trap 74A is formed to be lower than the upstream side and the downstream side of the drain trap 74A in the second circulation path 72 in a state where the washing machine 1 is installed. Therefore, as the operation of the circulation pump 90 is stopped, water is accumulated in the drain trap 74A, and the flow of air in the circulation path 70 is shut off. In this way, the function of the closing part 74 can be exhibited without supplying electric energy to the closing part 74, and therefore the amount of electric power consumed by the washing machine 1 is reduced. An example of the shape of the drain trap 74A is substantially U-shaped.

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

The washing machine 1 further includes a pulsator 110 and a driving unit 120. The pulsator 110 functions to agitate water in the inner tub 30. The pulsator 110 is provided on the bottom 31D of the casing 31 so as to be rotatable with respect to the inner tub 30, for example. In one example, the pulsator 110 is provided to be rotatable around the center of the inner tub 30 as a rotation center in a plan view of the washing machine 1. The pulsator 110 includes a plurality of blades 111 and a base 112. A plurality of blades 111 are formed on the base 112 in a manner standing from the base 112. An example of the number of the plurality of blades 111 is 4. One example of the shape of the blade 111 is a scalene triangle.

The driving part 120 drives to stir the water in the inner tank 30. The driving unit 120 includes a washing motor 121 and a switching unit 122 (see fig. 2). An output shaft (not shown) of the washing motor 121 is connected to the inner tub 30 and the pulsator 110 via a switching unit 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 part 122, the inner tub 30 is rotated with respect to the outer tub 20 by driving the washing motor 121. When the washing motor 121 and the pulsator 110 are connected to each other by the switching unit 122, the washing motor 121 is driven to rotate the pulsator 110 with respect to the inner tub 30, thereby stirring the water in the inner tub 30.

The washing machine 1 further includes a drying path 130 and a dryer 140. The drying path 130 is connected to the outer tub 20 so that warm air can be supplied into the inner tub 30. In one example, the drying passage 130 connects the outer tub 20 and the drainage passage 80. The dryer 140 functions to dry the laundry in the inner tub 30. The dryer 140 is provided in the drying path 130, for example. The dryer 140 is driven with the circulation pump 90 stopped. Since the dryer 140 is driven in a state where the flow of air in the circulation path 70 is shut off by the closing part 74, the laundry can be dried efficiently.

In addition, water vapor generated from the laundry during the drying of the laundry may leak from the outer tub 20 through the circulation path 70. In one example, consider the following: the water vapor flowing into detergent box 40 leaks out through a gap formed between detergent box 40 and a cover (not shown) of detergent box 40. In this example, the water vapor leaking from the outer tub 20 may adhere to various electric components constituting the washing machine 1. However, in washing machine 1, since the water vapor generated from the laundry is cut by closing part 74 while passing through circulation path 70, the risk of the water vapor leaking from outer tub 20 can be reduced.

The dryer 140 includes a blower 141, a fan motor 142, and a heater 143 shown in fig. 2. The blower 141 functions to generate wind to circulate air of the drying path 130. The blower 141 is, for example, a vortex fan having 4 blades. The fan motor 142 functions to rotate the blower 141. An output shaft (not shown) of the fan motor 142 is connected to the blower 141. The heater 143 functions to heat the air in the drying path 130. In one example, the heater 143 is provided on the downstream side of the blower 141 in the drying path 130. The fan motor 142 is driven to rotate the blower 141, and the heater 143 heats the air generated by the blower 141, thereby supplying warm air into the inner tub 30 through the outer tub 20.

The washing machine 1 further includes a control device 150. The control device 150 is provided in the main body 10 of the washing machine 1, for example (see fig. 1). The control device 150 functions to control various operations related to the washing machine 1 based on the operation of the operation unit 14. The control device 150 controls the driving 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, for example, based on the operation of the operation unit 14.

The structure of the detergent box 40 and the water supply pipe 50 will be described with reference to fig. 3.

Detergent box 40 includes first and second receiving portions 41 and 42, a merging path 43, and a merging opening 44. The first housing part 41 functions to house a detergent. In one example, the detergent is put into the first storage unit 41 from the outside of the washing machine 1. The second housing portion 42 functions to house the softener. In one example, the softener is introduced into the second storage portion 42 from the outside of the washing machine 1. The merging flow path 43 has a function of merging water supplied from the water supply pipe 50, the detergent contained in the first containing portion 41, the softener contained in the second containing portion 42, and the like. The merging path 43 is connected to the first receiving portion 41 and the second receiving portion 42. The merging opening 44 is provided downstream of the merging path 43 and is connected to a 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 branch from a common pipe 54. The first pipe 51 includes a first supply port 51A. The first supply port 51A faces the first housing portion 41, for example. The water flowing through the first pipe 51 is supplied to the first storage part 41 through the first supply port 51A, mixed with the detergent stored in the first storage part 41, and then flows to the merging path 43. The second pipe 52 includes a second supply port 52A. The second supply port 52A faces the second housing portion 42, for example. The water flowing through the second pipe 52 is supplied to the second receiving portion 42 through the second supply port 52A, mixed with the softener received in the second receiving portion 42, and then flows to the merging path 43.

The third pipe 53 includes a shower nozzle 53A. The shower nozzle 53A faces a portion downstream of the merged portion in the merged path 43, which is a portion of the hydration flow supplied to the first receiving portion 41 and the second receiving portion 42, for example. The water flowing through the third pipe 53 is supplied to the merging path 43 through the shower nozzle 53A, and thus the water containing the detergent, the softener, and the like is easily foamed. The second circulation path 72 is connected to a portion of the merging path 43 on the downstream side of the portion of the hydration flow supplied from the shower nozzle 53A, for example, in the detergent box 40. The water flowing in the second circulation path 72 and the hydration flow flowing in the merging path 43, whereby the water containing the detergent, the softener, and the like is easily foamed.

The relationship between the lower opening 25 and the drain opening 26 will be described with reference to fig. 4.

The lower opening 25 and the drain opening 26 are located at positions sandwiching the center of the outer tub 20, the center of the inner tub 30, the center of the pulsator 110, and the center of a balancer (not shown) in a plan view of the washing machine 1. In this configuration, since the distance between the lower opening 25 and the drain opening 26 is long, foreign matter flowing with the flow of water from the drain opening 26 toward the drain passage 80 is less likely to flow into the lower opening 25. Therefore, foreign matters are not easily taken into the circulation path 70.

The area of the lower opening 25 is smaller than the area of the drain opening 26. Therefore, foreign matter such as coins is not likely to flow to the circulation path 70. An example of the coin (coin) is a metal coin. The circulation path 70 includes a filter 73 (see fig. 5). The filter 73 is provided in the lower opening 25, for example. The filter 73 is formed to prevent coins from passing therethrough. Therefore, foreign matter such as coins is less likely to enter the circulation pump 90 (see fig. 1) provided in the circulation path 70. The drain path 80 does not include a filter. Therefore, resistance of water in the drainage path 80 is reduced, and drainage is improved.

As shown in fig. 5, the filter 73 includes a first hole 73A, a second hole 73B, and a connecting hole 73C forming the lower opening 25. One example of the shape of the first holes 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 and second holes 73A and 73B are formed to block coins from passing therethrough and to allow garbage separated from the laundry as washing proceeds therethrough. The first holes 73A and the second holes 73B are formed in the filter 73, and thus the resistance of the water in the filter 73 becomes small. Further, since the waste passes through the holes 73A and 73B, the risk of the passage area of the circulation path 70 becoming narrow due to the accumulation of the waste can be reduced.

The coupling hole 73C is formed to couple the first hole 73A and the second hole 73B. In this structure, when a first portion including one end of the thread break head flows to the first hole 73A and a second portion including the other end of the thread break head flows to the second hole 73B, a third portion between the first portion and the second portion of the thread break head can flow to the linking hole 73C. Therefore, the thread waste is not easily caught to the filter 73.

The impeller 91 includes a plurality of blades 91A and a base 91B. The plurality of blades 91A radially extend from the base 91B. An example of the number of the plurality of blades 91A is 4. One example of the shape of the blade 91A is a rectangle. In one example, the impeller 91 is fixed to the output shaft 92A of the circulation motor 92 by attaching the base 91B to the output shaft 92A (see fig. 6).

The structure of the circulation motor 92 will be described with reference to fig. 6.

The washing machine 1 further includes an adjustment structure 100. The adjustment structure 100 adjusts the position of the impeller 91 with respect to the bottom surface 93A such that the interval between the impeller 91 and the bottom surface 93A of the housing 93 when the rotation of the circulation motor 92 is stopped is narrower than the interval between the impeller 91 and the bottom surface 93A when the circulation motor 92 is rotated. The bottom surface 93A of the housing 93 is located below the impeller 91. In the case where a portion of the casing 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 casing 93.

The adjustment arrangement 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 disposed below the bottom surface 93A of the housing 93. The rotor 92B is coupled to the output shaft 92A. The circulation motor 92 is driven by generating electromagnetic force in the stator 92C, and the circulation motor 92 is stopped by eliminating the electromagnetic force in the stator 92C.

In the circulation motor 92, as the electromagnetic force of the stator 92C is eliminated, the rotor 92B moves downward so as to be separated from the bottom surface 93A, and the impeller 91 approaches the bottom surface 93A. The circulation motor 92 is configured such that the rotor 92B moves upward so as to approach the bottom surface 93A as the stator 92C generates electromagnetic force, and thereby the impeller 91 can be separated from the bottom surface 93A. 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 two-dot chain line of fig. 6 shows a state where the impeller 91 is close to the bottom surface 93A.

Since the distance between the impeller 91 and the bottom surface 93A is narrowed when the rotation of the circulation motor 92 is stopped, when the water flows through the circulation path 70 in a state where the circulation motor 92 is not rotating, the dust such as the thrum is less likely to enter between the impeller 91 and the bottom surface 93A. Therefore, the waste such as the broken thread ends contained in the water is not easily caught by the circulation pump 90. Further, the circulation motor 92 serves as both a drive source for rotating the impeller 91 and a mechanism for adjusting the position of the impeller 91, and therefore the structure of the apparatus is simplified. Further, since a mechanism for adjusting the position of the impeller 91 based on the relationship between the rotor 92B and the stator 92C is configured, the structure of the circulation motor 92 is simplified.

The circulation motor 92 is configured such that the impeller 91 contacts the bottom surface 93A without generating electromagnetic force in the stator 92C. Therefore, when the water flows through the circulation path 70 in a state where the circulation motor 92 is not rotating, the dust such as the thrum is less likely 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. 1.

The control device 150 stores a plurality of washing programs related to washing of laundry. The washing program includes at least a water supply period SP and a washing period WP (refer to fig. 8). The water supply period SP is a period during which water is supplied from the water supply source into the inner tub 30. Specifically, the water supply period SP is a period from the water supply source to the inside of the inner tub 30 until the water level of the inner tub 30 reaches the washing water level WL. The washing water level WL is, for example, a water level of the inner tub 30 suitable for washing, and is set in advance based on the amount of laundry stored in the inner tub 30. The washing period WP is a period after the water supply period SP during which the laundry in the inner tub 30 is washed. For example, the operation of circulation pump 90 and drive unit 120 in water supply period SP are substantially the same, and the operation of circulation pump 90 in washing period WP is different from each other. The control device 150 executes the washing program selected based on the operation of the operation unit 14.

The control means 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). First period SP1 is a period during which circulation pump 90 is driven. The second period SP2 is a period during which the circulation pump 90 is stopped after the first period SP1 or the circulation pump 90 is driven with a driving force weaker than that in the first period SP1 after the first period SP 1. In addition, the second period SP2 includes a point of time when the water level in the inner tub 30 reaches the washing water level WL.

In the first period SP1, the circulation pump 90 is driven to cause the water circulating through the outer tub 20, the inner tub 30, and the circulation path 70 to flow, thereby generating bubbles in the outer tub 20 and the inner tub 30. In the case where the circulation pump 90 is stopped in the second period SP2, the water is not circulated in the path including the circulation path 70, and thus the force of generating the 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, and therefore, bubbles are not easily generated in the outer tank 20 and the inner tank 30. In this way, in the second period SP2 in which the water level in the outer tank 20 and the inner tank 30 is higher than in the first period SP1, the state in which the bubbles are not easily generated is formed, and therefore, the risk of the bubbles overflowing from the outer tank 20 can be reduced. In addition, at the washing water level WL at which the water level inside 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 with a weak driving force, and thus the risk of bubbles overflowing from the outer tub 20 can be further reduced. In one example, the second period SP2 is a period in which the circulation pump 90 is stopped after the first period SP 1.

The problem of overflowing of bubbles from the outer tub occurs mainly in the washing machine including the circulation path.

The washing machine of the first example (hereinafter, referred to as a "first washing machine") does not include an outer tub cover and a drying path. In the case of the first washing machine: in the case where a large amount of foam is generated in the inner tank, the foam accumulates on the water surface in the outer tank and the inner tank, and the foam overflows through the second opening of the outer tank.

A washing machine of a second example (hereinafter, referred to as a "second washing machine") includes an outer tub cover without a drying path. The outer tub cover of the second washing machine is not used for the purpose of closing the laundry in the inner tub and drying the laundry by the dryer, and therefore, it is necessary to release the water vapor generated from the laundry, and therefore, the second opening of the outer tub is not properly sealed by the outer tub cover or a slit is formed in the outer tub cover in many cases. Therefore, when a large amount of foam is generated in the inner tank, the foam is accumulated on the water surfaces in the outer tank and the inner tank, and the foam overflows through the gap between the casing of the outer tank and the outer tank cover or the slit of the outer tank cover.

A washing machine of a third example (hereinafter, referred to as a "third washing machine") includes an outer tub cover and a drying path. An example of the third washing machine is a drum-type washing machine. In the case of the third washing machine: in the case where a large amount of foam is generated in the inner tank, the foam accumulates on the water surface in the outer tank and the inner tank, and the foam further overflows from the outer tank and enters into the drying path. In this case, the foam entering the drying path may adhere to the dryer.

A washing machine of a fourth example is the washing machine 1 shown in fig. 1. The washing machine 1 may have the same problems as the third washing machine. In addition, in the washing machine 1, when a large amount of bubbles are generated in the inner tub 30, the bubbles are accumulated on the water surface in the outer tub 20 and the inner tub 30, and further the bubbles are accumulated in the detergent box 40. In this case, it is considered that the foam overflowing from outer tub 20 overflows from a gap formed between detergent box 40 and a cover of detergent box 40.

The third period SP3 is a period during which the circulation pump 90 is stopped before the first period SP1 or the circulation pump 90 is driven with a driving force weaker than that in the first period SP1 before the first period SP 1. In a state where 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, and thus it is difficult to efficiently generate bubbles. In the washing machine 1, the circulation pump 90 is stopped in a state where the water levels in the outer tub 20 and the inner tub 30 are low, or the driving force thereof is weak even when the circulation pump 90 is driven, so that the efficiency of using energy in the washing machine 1 can be improved.

The third period SP3 includes a period from the start of water supply from the water supply source into the outer tub 20 until 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 is stopped in the third period SP 3. Therefore, the risk of starting the operation of the circulation pump 90 in a state where air is contained in the circulation pump 90 can be reduced.

The control device 150 controls the circulation pump 90 such that the second period SP2 is longer than the third period SP 3. Since the second period SP2 in which the generation of the foam is not easily performed after the first period SP1 or the second period SP2 in which the generation amount is small even if the foam is generated becomes long, the risk of the foam overflowing from the outer tub 20 can be further reduced. For example, the lengths of the first period SP1, the second period SP2, and the third period SP3 are appropriately changed according to the amount of laundry stored in the inner tub 30.

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, or the circulation pump 90 is repeatedly brought into a state of strong driving force and a state of weak driving force in the first period SP 1. In the case where water is stirred with a strong force continuously in order to generate foam, there is a possibility that the volume of foam increases sharply. In washing machine 1, in first period SP1 in which circulation pump 90 is driven to generate suds, a state in which the driving of circulation pump 90 is stopped or a state in which the driving force of circulation pump 90 is weak is intermittently generated, and therefore the risk of suds overflowing from outer tub 20 can be reduced. In one example, when the amount of laundry stored in the inner tub 30 is larger than the predetermined amount, the controller 150 controls the circulation pump 90 so that the circulation pump 90 is repeatedly driven and stopped in the first period SP 1. Whether the amount of laundry contained in the inner tub 30 is more than a predetermined amount is determined based on a 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 driving unit 120 during the water supply period SP. Bubbles are generated in the outer tub 20 and the inner tub 30 by the driving of the circulation pump 90 in the water supply period SP, and the water in the inner tub 30 is agitated by the rotation of the pulsator 110. Therefore, the distribution of the bubbles generated in the outer tub 20 and the inner tub 30 becomes less uneven, and the dirt on each piece of clothes in the inner tub 30 is less likely to be removed unevenly.

The control device 150 drives the driving unit 120 in a state where the circulation pump 90 is driven 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 stirred by the rotation of the pulsator 110 are cooperatively formed, bubbles can be effectively generated. The control means 150 starts the driving of the circulation pump 90 and the driving part 120 after the start time point of the water supply period SP. In one example, the control device 150 maintains the state where the driving unit 120 is stopped in the third period SP3, and starts driving the driving unit 120 in the first period SP 1. Since the circulation pump 90 and the driving unit 120 are not driven in a state where the water level in the inner tub 30 is low, the following risk can be reduced: the laundry is damaged by being in contact with the pulsator 110 rotated by the driving of the driving part 120.

The control device 150 stops the driving of the circulation pump 90 and the driving unit 120 in the middle of the water supply period SP. In one example, the control device 150 stops the driving of the driving unit 120 in the second period SP 2. When the driving of the circulation pump 90 and the driving part 120 is stopped, the water is not circulated, and thus bubbles are not easily generated in the outer tank 20 and the inner tank 30. Therefore, the risk of the foam overflowing from the outer tub 20 can be reduced.

The control device 150 controls the driving unit 120 such that the length of the period from the time point at which the driving unit 120 stops driving in the middle of the water supply period SP to the end time point of the water supply period SP is longer than the length of the period during which the driving unit 120 is driven in the water supply period SP. In one example, the controller 150 controls the driving unit 120 such that the second period SP2 is longer than the period during which the driving unit 120 is driven in the first period SP 1. Therefore, the risk of the foam overflowing from the outer tub 20 can be further reduced.

Control device 150 controls drive unit 120 such that the output of drive unit 120 during water supply period SP is smaller than the output of drive unit 120 when drive unit 120 is driven after water supply period SP. In one example, control device 150 controls drive unit 120 such that the output of drive unit 120 during water supply period SP is smaller than the output of drive unit 120 during washing period WP. In the water supply period SP in which the water level in the inner tub 30 is lower than the washing period WP, the output of the driving part 120 is small, and thus, the laundry is prevented from contacting the pulsator 110 and being damaged.

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

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

The control device 150 controls the circulation pump 90 in various washing courses so that a state in which the circulation pump 90 is driven and a state in which the circulation pump 90 is stopped are included in the washing period WP. When the internal circulation pump 90 is driven during the washing operation WP, the water circulating through the outer tub 20, the inner tub 30, and the circulation path 70 flows, and bubbles are generated in the outer tub 20 and the inner tub 30. When the circulation pump 90 is stopped in the washing period WP, water is not circulated in the paths including the circulation path 70, and thus the force of generating bubbles in the outer tub 20 and the inner tub 30 becomes weak. In this way, a state in which foam is not easily generated is formed in the WP during washing, and therefore the risk of foam overflowing from the outer tub 20 can be reduced.

The control device 150 controls the circulation pump 90 so that the period during which the circulation pump 90 is driven is longer than the period during which the circulation pump 90 is stopped during the washing period WP in each of the washing courses. Therefore, a quantity of foam suitable for washing is easily generated in the WP during washing. In each of the washing courses, the control device 150 stops the circulation pump 90 in the second half including the end time of the washing period WP. During the latter half of the washing period WP during which dirt of the laundry is substantially washed away, the amount of foam generated has little influence on the washing completion of the laundry. Therefore, by stopping the circulation pump 90 during the latter half of the washing period WP, it is possible to suppress the influence on the washing completion of the laundry, and to reduce the risk of the bubbles overflowing from the outer tub 20.

The washing periods WP include a first washing period WP1 and a second washing period WP2 (refer to 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 state where the circulation pump 90 is driven is included in the first washing period WP1 and the state where the circulation pump 90 is stopped is included in the second washing period WP 2. The circulation pump 90 is driven in the first washing period WP1 in which the output of the driving part 120 is high, whereby the generation amount of bubbles becomes more. Therefore, the force of washing off the dirt of the laundry becomes strong. The circulation pump 90 is stopped in the second washing period WP2 in which the output of the driving part 120 is low, whereby the generation amount of bubbles becomes smaller. Therefore, the risk of the foam overflowing from the outer tub 20 can be reduced.

Control device 150 controls drive unit 120 such that the maximum rotation speed of drive unit 120 in second washing period WP2 is lower than the maximum rotation speed of drive unit 120 in first washing period WP 1. Therefore, the generation amount of the bubbles in the second washing period WP2 is further reduced, and the risk of the bubbles overflowing from the outer tub 20 can be further reduced. The control device 150 controls the driving part 120 so that the end time point of the washing period WP is included in the second washing period WP 2. Therefore, the driving part 120 is driven at a low output during the second washing period WP2 including the end time point of the washing period WP, whereby the washing completion of the laundry can be suppressed from being affected and the risk of the bubbles overflowing from the outer tub 20 can be reduced. In one example, the controller 150 controls the driving unit 120 to separate the plurality of clothes accommodated in the inner tub 30 during the second washing period WP 2.

The control device 150 controls the circulation pump 90 so that a state in which the circulation pump 90 is driven and a state in which it is stopped are included in the first washing period WP 1. In one example, the circulation pump 90 is stopped at the end time point of the first washing period WP 1. As the circulation pump 90 is continuously driven for a longer time, the volume of the bubbles on the water surface in the inner tank 30 increases, and the possibility of the bubbles overflowing from the outer tank 20 increases. In the case where circulation pump 90 is continuously driven for a long time in first washing period WP1 in which the output of drive unit 120 is high, the possibility becomes further high. In the washing machine 1, the state in which the circulation pump 90 is driven and stopped is included in the first washing period WP1 in which the output of the driving part 120 is high, and therefore, it is possible to avoid a case in which the circulation pump 90 is continuously driven for a long time, thereby reducing the risk of bubbles overflowing from the outer tub 20.

The plurality of washing courses includes a long-time course and a short-time course. The long time program is a washing program in which WP is relatively long during washing. The long time process includes, for example, a first washing process, a second washing process, and a third washing process. The washing period WP of the long time program is sequentially increased in the order of the first washing program, the second washing program, and the third washing program. The short time program is a washing program in which the washing period WP is relatively short. The short time process includes, for example, a fourth washing process, a fifth washing process, a sixth washing process, a seventh washing process, and an eighth washing process. The washing period WP of the short time program is sequentially increased in the order of the fourth washing program, the fifth washing program, the sixth washing program, the seventh washing program, and the eighth washing program. The circulation pump 90 is not driven during the washing period WP of the eighth washing process.

The control device 150 controls the circulation pump 90 such that the period during which the circulation pump 90 is stopped in the long time routine is longer than the period during which the circulation pump 90 is stopped in the short time routine. The period during which the control device 150 stops the circulation pump 90 is the sum of the times during which the circulation pump 90 is stopped during the washing period WP. The period during which the circulation pump 90 is stopped in the long time course is long, and therefore even in the case where the washing period WP is relatively long, the risk of the bubbles overflowing from the outer tub 20 can be reduced.

The control device 150 controls the circulation pump 90 in a long time program so that the circulation pump 90 is intermittently driven. 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 process and the second washing process of the long time process. When the circulation pump 90 is intermittently driven, a series of operations of driving and then stopping the circulation pump 90 are repeated. In a series of operations in the case where the circulation pump 90 is intermittently driven, the time for which the circulation pump 90 is stopped is set based on the time for which the circulation pump 90 is driven. In a series of operations in the case where the circulation pump 90 is intermittently driven, it is preferable that the time for stopping the circulation pump 90 is relatively extended to suppress foaming when the circulation pump 90 is driven for a relatively long time.

In one example, the control device 150 controls the circulation pump 90 in the first washing process such that the circulation pump 90 is driven for 400 seconds, then 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 period during which the circulation pump 90 is stopped is extended by intermittently driving the circulation pump 90, the risk of the bubbles overflowing from the outer tub 20 can be reduced even when the washing period WP is relatively long.

The control device 150 controls the circulation pump 90 such that the driving 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 driving time of the circulation pump 90 in the former half of the period in which the circulation pump 90 is intermittently driven. Further, the control device 150 controls the circulation pump 90 such that the driving time of the circulation pump 90 in the second half of the period in which the circulation pump 90 is intermittently driven is shorter than the stopping time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. Since the bubbles generated in the outer tank 20 and the inner tank 30 are accumulated on the water surface in the inner tank 30, the volume of the bubbles on the water surface increases as the driving time of the circulation pump 90 in the period in which the circulation pump 90 is intermittently driven becomes longer. In washing machine 1, since the driving time of circulation pump 90 in the latter half period is shortened, the amount of foam generated can be suppressed, and the risk of foam overflowing from outer tub 20 can be reduced.

In one example, the control device 150 controls the circulation pump 90 such that the driving time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is shorter than the driving time of the circulation pump 90 in the first 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. Since the driving time of the last circulation pump 90 is shortened, the amount of foam generated can be further suppressed, and the risk of foam overflowing from the outer tank 20 can be further reduced.

The control device 150 controls the circulation pump 90 such that 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. In one example, the controller 150 controls the circulation pump 90 such that the stop time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is longer than the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven. Since the last circulation pump 90 is stopped for a longer time, the amount of foam generated can be suppressed, and the risk of foam overflowing from the outer tank 20 can be reduced.

The control device 150 controls the circulation pump 90 such that the period during which the circulation pump 90 is stopped in the washing period WP is increased as the length of the long time program is increased. Thus, the risk of foam overflowing from the outer tub 20 can be further reduced in a long time course. The control device 150 controls the circulation pump 90 so that the state where the circulation pump 90 is intermittently driven is not included in the short time routine. Therefore, the risk of the generation amount of foam becoming small in the case where the circulation pump 90 is driven can be reduced in the short time course.

The control device 150 executes, for example, a washing program selected based on the operation of the operation unit 14. In one example, the controller 150 controls the driving unit 120 to rotate the pulsator 110 at a predetermined rotation speed before executing the washing program, and determines the amount of laundry contained in the inner tub 30 based on a load applied to the washing motor 121. When it is determined that the amount of laundry contained in the inner tub 30 is less than the predetermined amount, the controller 150 executes a washing program in a first use state to be described below. When it is determined that the amount of laundry contained in the inner tub 30 is larger than the predetermined amount, the controller 150 executes a washing program in a second use state, which will be described below.

An example of the first use state of the washing machine 1 will be described with reference to fig. 8. Fig. 8 shows an example of the operation of the first washing program in the first use state.

At time t1, controller 150 controls water supply valve 55 to supply water from the water supply source into outer tub 20 and inner tub 30 at a predetermined amount of supplied water via water supply pipe 50, detergent box 40, and the like. An example of the predetermined water supply amount is 15L/min. The water supplied into the outer tub 20 and the inner tub 30 contains a detergent, a softener, and the like. The water level in the inner tub 30 continuously rises while water is supplied from the water supply source. The controller 150 controls the switch 122 to connect the washing motor 121 to the inner tub 30 via the switch 122, and controls the washing motor 121 to rotate the inner tub 30 at a predetermined rotation speed. An example of the predetermined rotation speed is 35 rpm. The inner tub 30 rotates at a predetermined rotation speed, and thereby the plurality of laundry items accommodated in the inner tub 30 are separated. The control device 150 does not drive the circulation pump 90 during the third period SP3 including the period from time t1 to time t 2.

At time t2, control device 150 controls circulation motor 92 to drive circulation pump 90. The control device 150 keeps driving the circulation pump 90 for the first period SP1 including the period from time t2 to time t 3. Therefore, foam is easily generated in the outer tank 20 and the inner tank 30. At time t2, after controlling the washing motor 121 to stop the rotation of the inner tub 30, the controller 150 controls the switch 122 to connect the washing motor 121 and the pulsator 110 via the switch 122, and controls the washing motor 121 to rotate the pulsator 110 at the first rotation speed RS 1. An example of the first rotation speed RS1 is 110 rpm.

At time t3, the control device 150 controls the circulation motor 92 to stop the circulation pump 90. The control device 150 maintains the state of stopping the circulation pump 90 during the second period SP2 including the period from time t3 to time t 4. In addition, at time t3, the control device 150 controls the washing motor 121 to stop the rotation of the pulsator 110. In the second period SP2 in which the water level in the outer tank 20 and the inner tank 30 is higher than in the first period SP1, the circulation pump 90 and the drive unit 120 are stopped, and therefore, a state in which foam is not easily generated is formed in the outer tank 20 and the inner tank 30. Therefore, the risk of the foam overflowing from the outer tub 20 can be reduced.

At time t4, controller 150 determines that the water level in inner tub 30 has reached wash water level WL, and controls water supply valve 55 to stop the supply of water from the water supply source into outer tub 20 and inner tub 30. The washing water level WL is a water level at which the water level in the inner tub 30 is the highest in the washing course. The washing water level WL is set according to the amount of laundry received in the inner tub 30. In addition, the control device 150 controls the washing motor 121 to rotate the pulsator 110 at the second rotation speed RS 2. An example of the second rotation speed RS2 is 120 rpm. The controller 150 detects, for example, the amount of water (hereinafter referred to as "splashed water") splashed from the water surface in the inner tub 30 by rotating the pulsator 110 at the second rotation speed RS 2. When the amount of the splashed water is larger than the predetermined amount, the foam generated in the outer tank 20 and the inner tank 30 is likely to overflow from the outer tank 20. In one example, when it is determined that the amount of splashed water is greater than the predetermined amount, the controller 150 discharges a part of the water in the outer tub 20 and the inner tub 30 or stops the washing process.

At time t5, control device 150 controls circulation motor 92 to drive circulation pump 90. 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 process. In addition, the control device 150 controls the washing motor 121 such that the pulsator 110 rotates at the third rotation speed RS 3. An example of the third rotation speed RS3 is 130 rpm. The control device 150 controls the washing motor 121 to continuously rotate the pulsator 110 at the third rotation speed RS3 during the first washing period WP1 including the period from time t5 to time t 11. Washing machine 1 starts to wash the laundry stored in inner tub 30 after time t 5.

At time t6, the control device 150 controls the circulation motor 92 to stop the circulation pump 90. At time t7, control device 150 controls circulation motor 92 to drive circulation pump 90. At time t8, the control device 150 controls the circulation motor 92 to stop the circulation pump 90. At time t9, control device 150 controls circulation motor 92 to drive circulation pump 90. At time t10, the control device 150 controls the circulation motor 92 to stop the circulation pump 90. Control device 150 maintains the state where circulation pump 90 is stopped after time t10 in washing period WP. 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, and a state in which foam is not easily generated is formed in the washing period WP. Therefore, the risk of the foam overflowing from the outer tub 20 can be reduced.

At time t11, the control device 150 controls the washing motor 121 to rotate the pulsator 110 at the fourth rotation speed RS 4. An example of the fourth rotation speed RS4 is 80 rpm. The pulsator 110 rotates at the fourth rotation speed RS4, and thereby laundry contained in the inner tub 30 is separated. At time t12, the control device 150 controls the washing motor 121 to stop the rotation of the pulsator 110. Further, the controller 150 controls the drain valves 76 and 81 so as to drain the water in the outer tank 20 and the inner tank 30. After the above steps, the control device 150 ends the first washing process in the first use state.

For example, after the various washing processes are completed, the controller 150 performs at least one of the rinsing process, the dehydrating process, and the drying process. In one example, the control device 150 performs each step in the order of the rinsing step, the dehydrating step, and the drying step.

The rinsing step is a step of rinsing the laundry accommodated in the inner tub 30. In one example, in the rinsing step, the controller 150 controls the water supply valve 55 to supply water again from the water supply source into the outer tub 20 and the inner tub 30, controls the washing motor 121 to rotate the inner tub 30 at a predetermined rotation speed, and then controls the drain valves 76 and 81 to drain the water in the outer tub 20 and the inner tub 30. An example of the predetermined rotation speed is 780 rpm. The control device 150 performs a rinsing process, thereby washing off dirt, foam, etc. attached to the laundry.

The dehydration step is a step of dehydrating the clothes accommodated in the inner tub 30. In one example, in the dehydration step, the controller 150 controls the washing motor 121 so that the inner tank 30 rotates at a predetermined rotation speed in a state where the water in the outer tank 20 and the inner tank 30 is discharged. An example of the predetermined rotation speed is 780 rpm. The controller 150 performs a dehydration process, thereby dehydrating the laundry received in the inner tub 30.

The drying step is a step of drying the clothes accommodated in the inner tub 30. In one example, in the drying process, the controller 150 controls the fan motor 142 and the heater 143 to supply warm air into the inner tub 30. The control device 150 performs a drying process, thereby drying the laundry received in the inner tub 30.

Next, an example of the second use state of the washing machine 1 will be described with reference to fig. 9. Fig. 9 shows an example of the operation of the first washing program in the second use state.

At time t21, control device 150 executes substantially the same processing as the processing executed at time t1 (see fig. 8). The control device 150 does not drive the circulation pump 90 during the third period SP3 including the period from time t21 to time t 22.

At time t22, control device 150 controls circulation motor 92 to drive circulation pump 90. The control device 150 controls the circulation motor 92 so that the circulation pump 90 is repeatedly driven and stopped during the first period SP1 including the period from time t22 to time t 25. At time t23, the control device 150 controls the circulation motor 92 to stop the circulation pump 90.

At time t24, control device 150 controls circulation motor 92 to drive circulation pump 90. Further, after controlling the washing motor 121 to stop the rotation of the inner tub 30, the controller 150 controls the switch 122 to connect the washing motor 121 and the pulsator 110 through the switch 122, and the controller 150 controls the washing motor 121 to rotate the pulsator 110 at the first rotation speed RS 1. At time t25, the control device 150 controls the circulation motor 92 to stop the circulation pump 90. The control device 150 maintains the state of stopping the circulation pump 90 for the second period SP2 including the time t25 to the time t 26. In addition, the control device 150 controls the washing motor 121 to stop the rotation of the pulsator 110.

The control device 150 executes substantially the same processing as the processing executed at the times t4 to t12 (see fig. 8) from the time t26 to t 34. After the above steps, the control device 150 ends the first washing process in the second use state.

An example of a method of using the washing machine 1 will be described with reference to fig. 1.

The washing machine 1 is used by a user as follows, for example. In the first process, the main body cover 13 and the outer tub cover 23 are opened, and laundry is put into the accommodation space 31B of the inner tub 30 through the openings 12, 22, and 32. In the second process, detergent, conditioner, and the like are received in the detergent box 40. In the third process, the power of the washing machine 1 is set to be on by operating the operation part 14, and an arbitrary washing course is selected.

The washing machine 1 performs the washing course selected through the third course. The control means 150 controls the circulation pump 90 so that a state of driving the circulation pump 90 and a state of stopping the circulation pump 90 are included in the water supply period SP of the washing process. Therefore, a state in which foam is not easily generated is formed in the SP during water supply, and the risk of foam overflowing from the outer tub 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 during the washing period WP of the washing program. Therefore, a state in which foam is not easily generated is formed in the WP during washing, and the risk of foam overflowing from the outer tub 20 is reduced. Then, after the laundry stored in the inner tub 30 is washed, the washed laundry is taken out from the storage space 31B of the inner tub 30 in the fourth process.

(modification example)

The description of the embodiments is illustrative of the manner in which the washing machine and the control device thereof according to the present invention can be implemented, and is not intended to be limiting. In addition to the embodiments, the present invention can be configured by combining at least two modifications of the embodiments described below and at least two modifications that are not mutually inconsistent.

The control content of 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 such that the circulation pump 90 repeatedly enters a state where the driving force is strong and a state where the driving force of the circulation pump 90 is weak in the first period SP 1. In the second example, when the amount of laundry stored in the inner tub 30 is larger than the predetermined amount, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is continuously driven in the first period SP 1. In the third example, when the amount of laundry stored in the inner tub 30 is smaller than the predetermined amount, the control device 150 controls the circulation pump 90 so that the circulation pump 90 is repeatedly driven and stopped in the first period SP 1.

The control content of 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 such that the circulation pump 90 is driven with a driving force weaker than that in the first period SP1 in the second period SP 2.

The control content of 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 such that the circulation pump 90 is driven with a driving force weaker than the driving force in the first period SP1 in the third period SP 3.

The relationship between the second period SP2 and the third period SP3 of the water supply period SP can be changed as desired. In the first example, the controller 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 such that the second period SP2 is shorter than the third period SP 3.

The content 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 into the outer tub 20 until 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 into the outer tank 20 until the water level of the inner tank 30 reaches the predetermined water level. An example of a preferable range relating to the predetermined water level is 15mm to 25 mm. An example of the predetermined water level is 22 mm.

The structure of the SP during water supply can be changed as desired. 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 point when the drive of the drive unit 120 is stopped in the middle of the water supply period SP to the end time point of the water supply period SP and the length of the period during which the drive unit 120 drives in the water supply period SP can be arbitrarily changed. In the first example, the control device 150 controls the driving unit 120 such that the length of the period from the time point at which the driving unit 120 stops driving in the middle of the water supply period SP to the end time point of the water supply period SP is substantially the same as the length of the period during which the driving unit 120 drives the water supply period SP. In the second example, the control device 150 controls the driving unit 120 such that the length of the period from the time point at which the driving unit 120 stops driving in the middle of the water supply period SP to the end time point of the water supply period SP is shorter than the length of the period during which the driving unit 120 drives in the water supply period SP.

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

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

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

The driving state of the driving unit 120 in the water supply period SP can be changed arbitrarily. In the first example, the control device 150 controls the driving part 120 such that the driving part 120 is continuously driven during the water supply period SP. In the second example, the control device 150 controls the driving part 120 such that the state where the driving part 120 is stopped is maintained during the water supply period SP.

The period during which the circulation pump 90 is stopped during 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 including the start time point of the washing period WP. In the second example, control device 150 stops circulation pump 90 in the middle of washing period WP.

The relationship between the period during which the circulation pump 90 is driven and the period during which the circulation pump 90 is stopped in the washing period WP can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 during the washing period WP such that the period during which the circulation pump 90 is driven is substantially the same as the period during which the circulation pump 90 is stopped. In the second example, control device 150 controls circulation pump 90 during washing period WP so that the period during which circulation pump 90 is driven is shorter than the period during which circulation pump 90 is stopped.

The relationship between the period during which the circulation pump 90 is stopped in the long time routine and the period during which the circulation pump 90 is stopped in the short time routine can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 such that the period during which the circulation pump 90 is stopped in the long time routine is substantially the same as the period during which the circulation pump 90 is stopped in the short time routine. In the second example, the control device 150 controls the circulation pump 90 such that the period during which the circulation pump 90 is stopped in the long time routine is shorter than the period during which the circulation pump 90 is stopped in the short time routine.

The relationship between the period during which the circulation pump 90 is stopped and the length of the long time program in the washing period WP can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 in the long time program so that the periods during which the circulation pump 90 is stopped in the washing period WP are substantially the same. In the second example, the control device 150 controls the circulation pump 90 such that the period during which the circulation pump 90 is stopped in the washing period WP is shortened as the length of the long time program is longer.

The relationship between the drive time of the circulation pump 90 in the second 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 can be arbitrarily changed. In the first example, the control device 150 controls the circulation pump 90 such that the drive time of the circulation pump 90 in the second half of the period in which the circulation pump 90 is intermittently driven is substantially the same as the drive time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. In the second example, the control device 150 controls the circulation pump 90 such that the driving time of the circulation pump 90 in the second half of the period in which the circulation pump 90 is intermittently driven is longer than the driving time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The same modification is true for the relationship between the driving 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 former half of the period in which the circulation pump 90 is intermittently driven.

The relationship between the driving time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven and the driving 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, the control device 150 controls the circulation pump 90 such that the driving time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is substantially the same as the driving time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. In the second example, the control device 150 controls the circulation pump 90 such that the driving time of the circulation pump 90 at the end of the period in which the circulation pump 90 is intermittently driven is longer than the driving time of the circulation pump 90 in the first half of the period in which the circulation pump 90 is intermittently driven. The same modification is true for the relationship between the drive time of the circulation pump 90 at the end 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 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 controls the circulation pump 90 such that the stop time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is substantially the same as the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven. In the second example, the control device 150 controls the circulation pump 90 such that the stop time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven is shorter than the drive time of the last circulation pump 90 in the period in which the circulation pump 90 is intermittently driven.

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 such that the circulation pump 90 is intermittently driven in all the washing courses in the long-time course. In the second example, the control device 150 controls the circulation pump 90 such that the circulation pump 90 is intermittently driven in a short time routine. In the third example, the control device 150 controls the circulation pump 90 so that the circulation pump 90 does not perform intermittent driving.

Whether or not the state in which the circulation pump 90 is driven and the state in which the circulation pump 90 is stopped are included in the washing period WP can be arbitrarily changed. In the first example, control device 150 keeps circulating pump 90 driven during washing period WP. In the second example, control device 150 maintains the state in which circulation pump 90 is stopped during 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, control device 150 controls drive unit 120 such that the maximum rotation speed of drive unit 120 in second washing period WP2 is substantially the same as the maximum rotation speed of drive unit 120 in first washing period WP 1. In the second example, control device 150 controls drive unit 120 such that the maximum rotation speed of drive unit 120 in second washing period WP2 is higher than the maximum rotation speed of drive unit 120 in first washing period WP 1.

The relationship between the output of the driving unit 120 in the second washing period WP2 and the output of the driving unit 120 in the first washing period WP1 can be arbitrarily changed. In the first example, control device 150 controls drive unit 120 such that the output of drive unit 120 in second washing period WP2 is substantially the same as the output of drive unit 120 in first washing period WP 1. In the second example, control device 150 controls drive unit 120 such that the output of drive unit 120 during second washing period WP2 is higher than the output of drive unit 120 during first washing period WP 1.

The structure 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 can take a form of omitting the dryer 140 and the drying path 130.

The structure of the adjustment structure 100 can be arbitrarily changed. In one example, the adjustment structure 100 includes another mechanism capable of adjusting the position of the impeller 91 instead of the circulation motor 92. An example of another mechanism is a ball screw. The washing machine 1 can adopt a manner of omitting the adjustment structure 100.

The structure of the circulation motor 92 can be arbitrarily changed. In one example, the circulation motor 92 is configured such that the impeller 91 does not contact the bottom surface 93A of the housing 93 when the stator 92C does not generate electromagnetic force. Therefore, when the stator 92C of the circulation motor 92 does not generate electromagnetic force, a gap is formed between the impeller 91 and the bottom surface 93A.

The structure of the closing portion 74 can be arbitrarily changed. In the first example, the closing unit 74 is provided on the upstream side of the circulation pump 90 in the circulation path 70. In the second example, the closing portion 74 includes an electromagnetic valve instead of the drain trap 74A. The washing machine 1 can adopt a mode of omitting the closing part 74.

The structure of the filter 73 can be arbitrarily changed. In the first example, the filter 73 includes at least one hole instead of the joining hole 73C, or includes at least one hole in addition to the joining hole 73C. The at least one hole is preferably formed to make the coin unable to pass and to make the garbage separated from the laundry with the washing to pass. 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, circulation path 70 is not connected to upper opening 24 and not connected to lower opening 25 via detergent box 40 and water supply hose 60. According to this example, the second circulation path 72 connects the casing 93 of the circulation pump 90 with the outer tank 20.

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

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

The position of the drain opening 26 of the outer tank 20 can be changed arbitrarily. In the first example, the drain opening 26 is provided in a portion of the outer tub 20 on the front side of the washing machine 1. In the second example, drain opening 26 is provided in a portion of outer tub 20 near the center of washing machine 1. In the third example, the drain 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 drain 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 drain 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 drain opening 26.

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

The washing machine 1 can omit at least one of the circulation pump 90 and the pulsator 110. The circulation path 70 can be omitted in the washing machine 1 even when the circulation pump 90 is omitted. In the case of the washing machine 1 omitting the pulsator 110, the water in the inner tub 30 is agitated by rotating the inner tub 30 with respect to the outer tub 20 in accordance with the driving of the driving part 120.

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

As described above, the washing machine according to the first aspect of the present invention includes: an outer tank including an upper opening, a lower opening, and a drain opening; an inner tank provided in the outer tank so as to communicate with the inside of the outer tank; and a circulation path connected to the outer tank so as to circulate water in the outer tank. Further, the apparatus comprises: a drainage path connected to the outer tank so as to be able to drain water in the outer tank; and a circulation pump for forming a flow of water in the circulation path. The circulation path is connected to the lower opening and the upper opening, and the drain path is connected to the drain opening.

The burden of design for determining the characteristics of flowing water in the circulation path and the characteristics of flowing water in the drainage path can be reduced. The characteristics related to the flowing water include, for example, the flow rate of water flowing through the circulation path and the drain path.

With regard to the washing machine of the second disclosure, in the first disclosure, the circulation path may include a filter, and the drain path may not include the filter.

Foreign matter such as coins is less likely to enter the circulation pump provided in the circulation path, and the resistance of water in the drainage path is reduced, thereby improving drainage.

With regard to the washing machine of the third disclosure, in the second disclosure, the filter may include at least one hole formed to make it impossible for coins to pass therethrough and to make trash separated from the laundry as washing passes therethrough.

Coins can be easily removed, and the risk that the passage area of the circulation path becomes narrow due to the accumulation of garbage can be reduced.

In the washing machine according to the fourth aspect, the holes may include at least a first hole and a second hole, and the filter may further include a coupling hole formed to couple the first hole and the second hole.

When the first portion including the one end of the thread break head flows toward the first hole and the second portion including the other end of the thread break head flows toward the second hole, the third portion between the first portion and the second portion of the thread break head can flow toward the linking hole. Therefore, the thread residue is not easily hooked to the filter.

In the washing machine according to the fifth aspect of the present invention, the lower opening may be provided in a bottom portion of the outer tub, and the drain opening may be provided in the bottom portion of the outer tub on a rear surface of the washing machine relative to the lower opening.

The water supplied from the upper opening into the outer tank flows in the inner tank while inclining from the upper portion toward the lower portion, and therefore, the water in the inner tank is more easily and uniformly stirred. In addition, when the outlet of the drainage path is drawn out to the back side of the washing machine, the length of the drainage path in the washing machine can be shortened.

In the washing machine according to the sixth aspect, in any one of the first to fourth aspects, the area of the lower opening may be smaller than the area of the drain opening.

Therefore, foreign matter such as coins is less likely to flow to the circulation path.

In the washing machine according to the seventh aspect, the area of the lower opening may be smaller than the area of the drain opening in the fifth aspect.

Therefore, foreign matter such as coins is less likely to flow to the circulation path.

In the washing machine according to the eighth aspect of the present invention, in the first aspect of the present invention, a distance between the upper opening and the lower opening may be longer than a distance between the upper opening and the drain opening.

Since the path of the flowing water formed in the outer tank and the inner tank by the circulating water is long, the water in the inner tank can be easily stirred uniformly by the circulating water.

In the washing machine according to the ninth aspect of the present invention, in the eighth aspect of the present invention, the upper opening portion may be provided in a portion of the outer tub closer to a rear surface of the washing machine, and the lower opening portion may be provided in a portion of the outer tub closer to a front surface of the washing machine.

The water supplied from the upper opening into the outer tank flows in the inner tank while inclining from the upper portion toward the lower portion, and therefore, the water in the inner tank is more easily and uniformly stirred.

In the washing machine according to the tenth aspect of the present invention, the drain opening may be provided in a portion of the outer tub near a rear surface of the washing machine in the eighth aspect of the present invention or the ninth aspect of the present invention.

When the outlet of the drainage path is drawn out to the back side of the washing machine, the length of the drainage path in the washing machine can be shortened.

Industrial applicability

The washing machine according to the present invention can be used for various washing machines including household and business washing machines.

Description of the reference numerals

1: a washing machine; 20: an outer tank; 24: an upper opening part; 25: a lower opening part; 26: a drain opening part; 30: an inner tank; 70: a circulation path; 80: a drainage path; 90: a circulation pump; 120: a drive section; 150: a control device; SP: during water supply; WL: washing water level; WP: during the washing.

Claims (6)

1. A washing machine is provided with:

an outer tank including an upper opening, a lower opening, and a drain opening;

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 as to allow water in the outer tank to circulate;

a water discharge path connected to the outer tank so as to be able to discharge water in the outer tank; and

a circulation pump for forming a flow of water in the circulation path,

wherein the circulation path is connected to the lower opening and the upper opening,

the drain path is connected to the drain opening portion,

the circulation path includes a filter, the drain path does not include a filter,

the outer tank includes a housing that houses the inner tank,

the filter includes first and second circular holes formed at the lower opening portion provided at the bottom surface of the case so that coins cannot pass therethrough and garbage separated from laundry with washing can pass therethrough, and a coupling hole connecting the first and second holes.

2. The washing machine as claimed in claim 1,

the drain opening is provided at the bottom of the outer tub at a position closer to the back surface of the washing machine than the lower opening.

3. A washing machine according to claim 1 or 2,

the area of the lower opening is smaller than the area of the drain opening.

4. The washing machine as claimed in claim 1,

the distance between the upper opening and the lower opening is longer than the distance between the upper opening and the drain opening.

5. A washing machine according to claim 4,

the upper opening is provided at a portion of the outer tub close to a rear surface of the washing machine,

the lower opening is provided in a portion of the outer tub near a front surface of the washing machine.

6. A washing machine according to claim 4 or 5,

the drain opening is provided in a portion of the outer tub near a rear surface of the washing machine.

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