WO2023176016A1 - Washing machine - Google Patents

Abstract

The present invention provides a washing machine that can use foam for washing in a state in which the washing action is sufficiently demonstrated and that can operate normally. The washing machine (100) comprises: a box body (1) forming an outer shell; an outer tank (2) provided in the box body (1); an inner tank (3) rotatably supported in the outer tank (2); a motor (4) for driving rotation of the inner tank (3); a foam generation means (54) for generating foam from detergent water; and a heating means (50) disposed in the outer tank (2) and used for defoaming the foam. Furthermore, a defoaming device (70) for mechanically defoaming foam generated in the outer tank (2) is provided.

Description

washing machine

The present invention relates to a washing machine with a function of defoaming foam in an outer tub.

The drum of a washing machine is enclosed in an outer tank that can store washing water. During the washing process, washing water containing dissolved detergent is stirred by the drum, so that foaming of the washing water causes bubbles to be generated in the outer tub. Generally, excessive foam generated during washing is known to interfere with the normal operation of washing machines. It is known that if a large amount of bubbles is generated in the outer tank, it may overflow from the outer tank or come into contact with electrical components, causing malfunctions.

On the other hand, in recent years, washing machines equipped with means for generating foam have also been developed. By actively generating foam, a function is added to actively utilize the cleaning action of the foam.

Patent Document 1 discloses a foam generating section that is attached to a storage tank in which clothing is stored and defines a generation space in which foam is generated; a liquid containing detergent is supplied to the foam generating section; A washing machine is described that includes a supply section that creates a liquid layer and an air layer, and a blower section that generates foam and supplies it to a storage tank by sending air toward the liquid layer through the air layer.

Patent Document 2 describes a drum-type washing machine that performs foam suppression control when a washing course involving heating of washing water is executed and generation of foam is detected during the washing process. . When the generation of bubbles is detected during the washing process, and the washing process time until the generation of bubbles is detected exceeds the specified time, or the temperature of the washing water exceeds the specified temperature. If so, control is executed to shift to the foam elimination mode and continue the washing process.

Patent Document 3 discloses a foam detection means for detecting foam, an air passage water supply means for supplying water to an upstream portion of a blower fan in a drying air passage, a means for rotating a rotating drum at a lower rotation speed than during washing, and a washing apparatus. determining means for determining whether or not foam is detected after rotating at a lower rotational speed than normal; means for continuing washing when determining that foam is not detected; and means for continuing washing when determining that foam is detected. A washer/dryer is disclosed which includes a water supply control means for supplying water through an air channel water supply means.

Patent No. 6135977 Patent No. 6636757 Patent No. 5787777

If excessive foam is generated unintentionally in the outer tub of the washing machine, or if foam is intentionally generated to actively utilize the cleaning action of the foam, the foam may overflow from the outer tub. There is a problem that bubbles can cause malfunctions. If a large amount of foam is generated in the outer tank, it may leak outside the machine or enter the ventilation passages inside the machine, causing electrical parts to malfunction. Further, when the cleaning process is followed by the dewatering process, a large amount of foam remains in the outer tank, which places a load on the motor that rotates the drum.

The bubbles generated in the outer tank during the cleaning process can naturally disappear over time. Moreover, defoaming can be promoted by diluting the washing water in which the detergent is dissolved with additional water supply. However, when the foam disappears naturally over time, it is necessary to stop the operation until the foam disappears, resulting in a problem that the drainage time becomes longer. Moreover, defoaming by diluting the washing water is not preferable for the user because it not only prolongs the drainage time but also leads to an increase in the amount of water used due to additional water supply.

In Patent Document 1, large bubbles are generated by sending air to the boundary between the liquid layer and the air layer through the air layer. However, with large bubbles, there is a possibility that the friction-reducing effect and oil adsorption effect of the bubbles cannot be sufficiently obtained compared to fine-grained bubbles. Further, Patent Document 1 does not disclose any means for forcibly extinguishing foam. If forced defoaming is not possible, there is a possibility that the cleaning action of foam can only be used to the extent that it does not affect the dehydration process.

In Patent Document 2, when the generation of bubbles is detected through the air trap, the mode is shifted to the bubble extinguishing mode. In the foam elimination mode, foam elimination control is performed in which a portion of the washing water in the water tank is drained to continue the washing process. When such control is performed, wasteful drainage of washing water is prevented, but the operating time including drainage is not fundamentally shortened.

In Patent Document 3, when foam is detected by a foam detection means during washing, after rotating the rotary drum at a lower rotation speed than during washing, when the determination means determines that foam has been detected, the air passage water supply means Water is being supplied by However, in the method using water supply, when foaming rapidly progresses, there is a high possibility that the foam cannot be discharged or defoamed, and the foam will accumulate in the air passage. In addition, the method using water supply takes time to supply water, leading to an extension of the entire cleaning process.

Under these circumstances, if a large amount of foam is unintentionally generated in the outer tank, or if foam is intentionally generated to actively utilize the cleaning action of the foam, the operating time will be reduced. There is a need for a means that can rapidly defoamer the foam in the outer tank without extending the time or adding water. There is a need for a washing machine that is equipped with a function to forcibly eliminate foam, and whose operation is not hindered by foam.

Therefore, it is an object of the present invention to provide a washing machine that allows foam to be used for washing in a state where the washing action is fully exerted, and that can perform normal operation.

In order to solve the above problems, a washing machine according to a first aspect of the present invention includes a box forming an outer shell, an outer tank provided in the box, and a washing machine rotatably supported in the outer tank. An inner tank, a motor for driving the rotation of the inner tank, a foam generating means for generating foam from detergent water, and a heating means disposed in the outer tank for defoaming the foam. Ta.

Further, a washing machine according to a second aspect of the present invention includes a box forming an outer shell, an outer tub provided in the box, an inner tub rotatably supported in the outer tub, and an inner tub. The outer tank includes a motor that drives the rotation of the tank, a foam generating means that generates foam from detergent water, and a defoaming device that defoams the foam generated in the outer tank using mechanical force.

According to the present invention, it is possible to provide a washing machine that allows foam to be used for washing in a state where the washing action is fully exerted, and that can perform normal operation.

1 is a perspective view showing the appearance of a washing machine according to an embodiment of the present invention. 1 is a cross-sectional side view showing the inside of a washing machine according to an embodiment of the present invention. It is a sectional view taken from the front showing the inside of the washing machine concerning a 1st embodiment. It is a sectional view taken from the front showing the inside of the washing machine concerning a 1st embodiment. It is a sectional view taken from the front showing the inside of a conventional washing machine. It is a figure which shows the example of a form of the heater for defoaming. It is a figure which shows the example of a form of the heater for defoaming. It is a figure which shows the example of a form of the heater for defoaming. It is a flow chart which shows an example of operation of a washing machine concerning a 1st embodiment. It is a flow chart which shows an example of operation of a washing machine concerning a 1st embodiment. FIG. 3 is a diagram showing power consumption-temperature characteristics of a defoaming heater. FIG. 3 is a diagram showing the relationship between power consumption and temperature of the defoaming heater during operation. It is a flow chart which shows an example of operation of a washing machine concerning a 1st embodiment. It is a sectional view taken from the front showing the inside of a washing machine concerning a 2nd embodiment. FIG. 7 is a cross-sectional side view showing the inside of a washing machine according to a second embodiment. It is a figure which shows the example of a form of the defoaming device with which a washing machine is equipped. It is a figure which shows the example of a form of the defoaming device with which a washing machine is equipped. It is a figure which shows the example of a form of the defoaming device with which a washing machine is equipped. It is a flow chart which shows an example of operation of a washing machine concerning a 2nd embodiment. It is a flow chart which shows an example of operation of a washing machine concerning a 2nd embodiment. It is a flow chart which shows an example of operation of a washing machine concerning a 2nd embodiment.

Hereinafter, a washing machine according to an embodiment of the present invention will be described with reference to the drawings. In addition, in each of the following figures, common components are given the same reference numerals and redundant explanations will be omitted.

FIG. 1 is a perspective view showing the appearance of a washing machine according to an embodiment of the present invention. FIG. 2 is a sectional side view showing the inside of the washing machine according to the embodiment of the present invention.
As shown in FIGS. 1 and 2, a washing machine 100 according to the present embodiment includes a box 1, an outer tub 2, a drum (inner tub) 3, a motor 4, and the like. The box 1, the outer tank 2, the drum 3, the motor 4, etc. are housed inside the box 1.

The box 1 forms the outer shell of the washing machine. The box body 1 is formed of a steel plate bonded with a reinforcing material, a cover that is a resin molded product, etc. on a base 1h that constitutes the bottom of the washing machine. The left and right side surfaces of the box body 1 are provided with side plates 1a connected by reinforcing materials. The rear surface of the box body 1 is provided with a back plate 1d. A front cover 1c, a lower front cover 1f, and a top cover 1e are provided from the front to the top of the box 1.

A circular opening is provided in the front cover 1c. A door 9 is attached to a reinforcing member that supports the front cover 1c via a hinge 9a. The door 9 includes a door frame 9b provided in an annular shape, a door glass 9c fixed to the center of the door frame 9b, and a door release lever 9d provided on the door frame 9b. The door 9 is provided to freely open and close an opening on the front side of the box body 1 provided in the front cover 1c.

When the door 9 is pressed against the front cover 1c, the front opening of the box 1 provided on the front cover 1c is closed and locked by the locking mechanism. When the door release lever 9d is pulled, the locking mechanism of the door 9 is released, and the front opening of the box body 1 can be opened. When the door 9 is open, laundry such as clothes can be taken in and out of the drum 3 housed inside the box 1.

An operation panel 6 is provided on the front side of the top surface of the box 1. The operation panel 6 is provided with operation switches 12 and 13 and a display 14. The operation switches 12 and 13 and the display 14 are electrically connected to a control board 61 built into the upper part of the box 1.

A detergent input section 7 is provided on the top surface of the box 1. The detergent dispenser 7 has a built-in detergent container. The detergent container is divided into multiple rooms. Detergents such as powdered detergent, liquid detergent, fabric softener, etc. can be individually added to each chamber of the detergent container. Inside the box 1, a water supply pipe 7c is connected to the detergent container. The other end of the water supply pipe 7c is connected to the outer tank 2.

Water supply hose connection ports 7a and 7b are provided on the rear side of the top surface of the box 1. A water supply hose that supplies water from a water faucet is connected to one water supply hose connection port 7a. The other water supply hose connection port 7b is connected to a water supply hose for supplying water such as remaining hot water for the bath. The water supply hose connection ports 7a and 7b are connected to a detergent container of the detergent input section 7. The supplied water dissolves detergents through the detergent container, and is supplied to the outer tank 2 as detergent water.

A drying filter 8 is attached to the top surface of the box 1. The dry filter 8 covers an air intake port opened on the top surface of the box body 1. The intake port communicates with a ventilation path provided inside the box body 1. Air used for dehydrating and drying laundry is passed through the ventilation path. The dry filter 8 collects dust and the like contained in the air taken into the ventilation path from outside the machine.

As shown in FIG. 2, the outer tank 2 is provided in a cylindrical shape with a bottom. The outer tank 2 is elastically supported by a plurality of suspensions 5. The suspension 5 is fixed on the base 1h. The suspension 5 is formed of an elastic coil spring, a damper that damps vibrations, and the like. The upper part of the outer tank 2 is supported by an auxiliary spring against the ceiling surface of the box body 1. The outer tank 2 is arranged in an inclined manner inside the box body 1 so that the central axis faces slightly upward on the front side and the front side is higher.

An outer tank cover 2a is provided on the front side of the outer tank 2. The outer tank cover 2a covers only the vicinity of the peripheral wall of the outer tank 2 on the front side of the outer tank 2. An opening is formed on the front side of the outer tank 2 on the central axis side of the outer tank 2. The outer tank 2 can store water by partially covering the front opening with an outer tank cover 2a. The outer tank 2 stores supplied water and washing water such as detergent water in which detergent is dissolved, depending on the operating process.

The front opening of the outer tank 2 is located approximately concentrically with the front opening of the box body 1 provided in the front cover 1c, and is closed to the outside of the machine when the door 9 is closed. A bellows (not shown) made of an elastic material such as rubber is attached to the front opening of the outer tank 2. The bellows watertightly closes the gap formed between the front opening of the outer tank 2 and the opening of the front cover 1c. It also comes into contact with the closed door 9 and closes the gap with the door 9 watertightly. When the door 9 is open, laundry can be taken in and out through the front opening of the outer tub 2.

The drum 3 is placed inside the outer tank 2. The drum 3 is provided in a bottomed cylindrical shape smaller than the outer tank 2. An opening is formed on the front side of the drum 3. A rotating shaft of a motor 4 is coupled to the center of the bottom wall of the drum 3. The drum 3 is rotatably supported by a motor 4. Like the outer tank 2, the drum 3 is arranged to be inclined so that the central axis faces slightly upward on the front side and the front side is higher. The drum 3 forms a washing tub for washing laundry such as clothes.

A large number of small holes are provided in the peripheral wall of the drum 3 so as to penetrate through the peripheral wall. The small holes function as water channels and ventilation channels that allow washing water, drying air, etc. to pass into and out of the drum 3. The laundry put into the drum 3 is washed in the washing water that flows in through the small holes. In addition, water is removed by discharging washing water through small holes and by centrifugal action caused by the rotation of the drum 3. Further, drying is carried out by the inflow and outflow of drying air through the small holes and the centrifugal action caused by the rotation of the drum 3.

A plurality of lifters are provided on the peripheral wall of the drum 3. The lifter is provided as a protrusion substantially parallel to the central axis of the drum 3. The lifter is provided so as to protrude from the peripheral wall of the drum 3 toward the inside of the drum 3. According to the lifter, when the drum 3 rotates, the laundry placed in the drum 3 is lifted. The lifted laundry falls due to gravity. By repeating such operations, effective cleaning and dehydration effects can be obtained.

A fluid balancer is provided around the opening of the drum 3. The fluid balancer is provided in a hollow structure extending in the circumferential direction of the drum 3, and is filled with liquid. The liquid sealed in the fluid balancer moves in the circumferential direction inside the fluid balancer according to gravity when the drum 3 rotates. According to the fluid balancer, vibrations caused by uneven laundry are reduced by moving the liquid.

The motor 4 drives the rotation of the drum 3 under control according to the operating process. The motor 4 is arranged at the rear of the outer tank 2. The rotating shaft of the motor 4 passes through the rear part of the outer tank 2 and is coupled to the bottom wall of the drum 3. The motor 4 is electrically connected to a control board (not shown). The motor 4 is controlled in forward rotation, reverse rotation, starting, and stopping by a control board.

A water receiver 2b is provided at the bottom of the outer tank 2. The water receiving portion 2b is provided in the shape of a saucer by bulging the lower peripheral wall of the outer tank 2 downward. A drain port 2c is formed at the rear side of the bottom of the water receiving portion 2b. An internal drainage pipe 20 is connected to the drainage port 2c. A filter case 32 is connected to the other end of the internal drainage pipe 20.

The filter case 32 is fixed to the lower front side of the box 1. A lint filter 31 is housed in the filter case 32 . The filter case 32 has a hollow structure, and has an inlet through which washing water flows in, an outlet through which washing water is drained, a circulation port through which washing water is returned, and an opening through which the lint filter 31 is inserted and removed. .

The lint filter 31 collects foreign substances such as lint from the washing water drained from the outer tank 2. The lint filter 31 is detachably provided to the filter case 32. For example, the lint filter 31 can be rotated within the filter case 32 to unlock it, open the door provided on the lower front cover 1f, and take it out of the machine through the opening of the filter case 32.

The circulation pump 21 is connected to the circulation port of the filter case 32. The circulation pump 21 is arranged below the outer tank 2. The suction side of the circulation pump 21 is connected to the internal drainage pipe 20 with the lint filter 31 in between. A discharge side of the circulation pump 21 is connected to a circulation pipe 22 . The other end of the circulation pipe 22 is connected to a water nozzle provided at the top of the outer tank cover 2a.

A connecting joint 33 is connected to the outlet of the filter case 32. The internal drainage pipe 20 and the connecting joint 33 communicate with each other with the lint filter 31 housed in the filter case 32 interposed therebetween. The drain valve 23 is connected to the other end of the connection joint 33. The connecting joint 33 can be provided integrally with the filter case 32.

The drain valve 23 is provided so that it can be opened and closed under control according to the operating process. An external drain pipe 24 is connected to the drain valve 23 . The external drain pipe 24 is connected to a drain plug or the like outside the machine. When the drain valve 23 is closed, washing water can be stored inside the outer tub 2. When the drain valve 23 is open, the washing water can be drained from the outer tank 2 to the outside of the machine.

The internal drainage pipe 20, the filter case 32, the connecting joint 33, and the external drainage pipe 24 form a drainage path that drains the washing water from the outer tub 2 to the outside of the machine. In FIG. 2, solid arrows indicate the flow of water in the drying process. The internal drainage pipe 20, the filter case 32, and the circulation pipe 22 form a circulation path through which washing water discharged from the outer tub 2 is circulated to the outer tub 2. The circulation pump 21 circulates detergent water or water to the outer tank 2.

When the circulation pump 21 operates with the drain valve 23 closed, the washing water in the outer tub 2 is sucked up to the upper part of the outer tub 2 through the internal drainage pipe 20 and the circulation pipe 22. The sucked up washing water is sprayed inside the drum 3 in a shower-like manner by a water spray nozzle (not shown). Spraying washing water onto the laundry loaded into the drum 3 provides high cleaning and rinsing power. Circulating and spraying washing water will save water during the washing and rinsing processes.

An exhaust port 2d is formed at the rear of the outer tank 2. A ventilation duct 27 is connected to the exhaust port 2d. The air duct 27 is provided so as to extend up and down the box 1. The other end of the ventilation duct 27 is connected to an intake duct 28. The intake duct 28 has an intake port opened on the top surface of the box body 1. A blower unit 40 is connected to the intake duct 28.

The blower unit 40 is fixed to the top of the box 1. The blower unit 40 is arranged above the outer tank 2 and separated from the outer tank 2. The blower unit 40 houses a blower 41 and a dry air heater 42 . The blower unit 40 includes a casing having a hollow structure, and has an inlet through which air flows in and an outlet through which air is discharged.

An intake duct 28 is connected to the inlet side of the blower unit 40. The blower 41 is arranged on the entrance side of the blower unit 40. A dry air heater 42 is arranged on the discharge side of the blower 41. A blowout pipe 29 is connected to the outlet side of the blower unit 40 . The other end of the blow-off pipe 29 is connected to a blow-off nozzle 30 provided on the upper part of the outer tank cover 2a.

The blower duct 27, the intake duct 28, the blower unit 40, the blower pipe 29, and the blower nozzle 30 form a blower path that circulates the air used for dehydrating and drying the laundry to the outer tub 2. In FIG. 2, dashed arrows indicate air flow during the drying process. The blower 41 circulates air in the outer tub 2 and sends the air toward the laundry loaded into the drum 3. The blower duct 27 returns air from the outer tank 2 to the blower 41. The drying air heater 42 heats and dries the air sent toward the laundry to generate drying air for drying the laundry.

When the blower 41 operates, air from outside the machine is sent to the upper part of the outer tank 2 through the intake duct 28, the blower unit 40, and the blowout pipe 29. Air sucked in from outside the machine is dried by a drying air heater 42 and then blown into the outer tank 2 by a blowing nozzle 30. The blown air is blown onto the laundry and then exhausted through the air duct 27. When drying air is sent to the laundry loaded into the drum 3, dehydration and drying of the laundry is promoted.

As shown in FIG. 3, an overflow port 2e is formed in the peripheral wall of the outer tank 2 at a predetermined height. An overflow pipe 25 is connected to the overflow port 2e. The other end of the overflow pipe 25 is connected to an external drain pipe 24 downstream of the drain valve 23. The overflow pipe 25 and the external drainage pipe 24 form an overflow path for draining washing water and the like in the outer tank 2 that exceeds a predetermined water level to the outside of the machine.

When the washing water in the outer tub 2 reaches a specified overflow water level due to excessive water supply or laundry, it is forcibly drained out of the machine through the overflow port 2e and overflow pipe 25. Drainage through such an overflow path is performed regardless of whether the drain valve 23 is opened or closed.

3 and 4 are front cross-sectional views showing the inside of the washing machine according to the first embodiment. FIGS. 3 and 4 each show an example of the internal structure of the washing machine according to the first embodiment in a state where washing water is foamed. In FIGS. 3 and 4, the dashed line L1 indicates the specified water level, and the dashed double dotted line L2 indicates the overflow water level.
As shown in FIGS. 3 and 4, the washing machine 100 according to the first embodiment includes a defoaming heater (heating means) 50 for defoaming foam.

The defoaming heater 50 is arranged inside the outer tank 2. The defoaming heater 50 has a function of forcibly defoaming the foam inside the outer tank 2. The defoaming heater 50 has a heating part that can be contacted by foam. According to the defoaming heater 50, the foam that comes into contact with the heating section is directly heated. By heating the water present at the interface of the foam, evaporation is promoted, and the foam inside the outer tank 2 can be rapidly broken.

Additionally, the washing machine 100 according to the present embodiment includes a foam generating means that generates foam from detergent water. In FIGS. 3 and 4, a foam generating unit 54 is provided on the circulation path as a foam generating means. The foam generating unit 54 has a function of foaming detergent water. According to the foam generation unit 54, fine foam is generated from the detergent water discharged from the outer tank 2 and returned to the outer tank 2. The generated foam is used for washing laundry. Such a foam generating unit 54 may be provided in the water receiving portion 2b of the outer tank 2, which is inside the outer tank 2 and outside the drum 3, instead of on the circulation path.

However, in the washing machine 100 equipped with the defoaming heater 50, the foam generation unit 54 does not necessarily have to be included. As the foam generating means, instead of the foam generating unit 54, an operational control for foaming detergent water may be used. For example, the detergent water can be foamed by stirring with the drum 3, spraying with a water nozzle, or the like. Appropriate operation control can produce fine foam.

Here, problems caused by bubbles in the field of washing machines will be explained with reference to figures.

FIG. 5 is a front cross-sectional view showing the inside of a conventional washing machine.
As shown in FIG. 5, a conventional washing machine 500 includes a box 1, an outer tub 2, a drum 3, a motor 4, etc., like the washing machine 100 according to the first embodiment. Further, a foam generating means such as a foam generating unit 54 may be provided. However, the conventional washing machine 500 does not include a defoaming means for defoaming foam.

In the conventional washing machine 500, when excessive foam is generated in the outer tub 2, there is a problem that the foam overflows outside the machine or comes into contact with electrical components, causing a malfunction. The conventional washing machine 500 may or may not be equipped with a foam generating means. Problems caused by bubbles can occur either when bubbles are intentionally generated or when bubbles are unintentionally generated due to stirring by the drum 3 or the like.

The effects of bubbles have been known in various fields. Dish detergents, facial cleansers, laundry detergents, etc. contain surfactants. A detergent solution containing a surfactant foams when stirred with mechanical force in a gas phase. It has been confirmed that bubbles generated in the gas phase reduce the frictional force on skin and clothing. Furthermore, it has been confirmed that fine bubbles are easily compatible with oil in the aqueous phase and have a high oil adsorption effect.

On the other hand, in the field of conventional washing machines, excessive foam has been known to interfere with the operation of the washing machine. Most conventional washing machines have been developed to suppress the generation of bubbles. As in Patent Document 1, some washing machines intentionally generate foam in order to actively utilize the cleaning action of foam. However, because of the problems caused by foam, the amount and density of foam are limited to an extent that does not interfere with the operation of the washing machine.

As shown in FIG. 5, a conventional washing machine 500 may include an overflow path for draining washing water in the outer tub 2 that exceeds a predetermined water level to the outside of the machine. The overflow route is formed by an overflow pipe 25 and an external drainage pipe 24. When an overflow path is provided, when the washing water in the outer tub 2 reaches the overflow level, it is forcibly drained out of the machine through the overflow path.

If the machine is equipped with a water overflow path, the washing water in the outer tub 2 will not exceed the overflow water level, which will prevent the washing water from overflowing outside the machine or from coming into contact with electrical parts and causing malfunctions. Prevented. If electrical components such as the blower 41, drying air heater 42, and control board 61 are placed above and apart from the outer tub 2, the risk of electrical components coming into contact with overflowing washing water is reduced. be done.

However, excessive foam may be generated inside the outer tank 2 due to adding too much detergent, stirring by the drum 3, etc. When excessive foam is generated, the apparent volume of the foam increases. Further, if excessive foam is generated or the foam has a high viscosity, it becomes difficult to discharge the foam from the outer tank 2 due to the head pressure. Washing water can be drained out of the machine using water head pressure after the washing process. However, the problem with foam is that it tends to remain in the outer tub 2 without being accompanied by the drained washing water.

When excessive foam is generated in the outer tank 2, as shown in FIG. 5, there is a high possibility that the height of the foam will rise to a height exceeding the overflow water level. Even when an overflow path is provided, there remains the problem that bubbles may overflow outside the machine or come into contact with electrical components, causing malfunctions. As shown in FIG. 5, even if electrical components such as the blower 41, dry air heater 42, and control board 61 are placed above the outer tank 2, bubbles can enter the inside of the air duct 27 and cause the inside to become damaged. It can climb up and come into contact with electrical parts.

Furthermore, if excessive bubbles are generated in the outer tank 2 and the dewatering process is started with the bubbles remaining in the outer tank 2, there is a problem that the load on the motor 4 increases. The foam remaining in the outer tank 2 may increase the resistance to rotation of the drum 3 and increase the load on the motor 4. When the load on the motor 4 increases, abnormal heat generation may occur due to overcurrent, or the motor 4 may not reach a specified rotational speed.

In order to avoid problems caused by foam, it is necessary to take measures to prevent washing water from foaming excessively and to defoam the foam. In order to prevent washing water from foaming excessively, control to suppress stirring by the drum 3, control to suppress return to the outer tank 2 by the circulation pump 21, etc. are required. In order to eliminate foam using existing means, there are controls to wait for the foam to disappear naturally, control to dilute the detergent by supplying additional water, and control to flush the foam by supplying additional water. Control etc. will be required.

However, if the washing water is controlled so as not to foam excessively, a problem arises in that the cleaning action of the foam cannot be sufficiently exerted. Furthermore, if the existing means is used to control the foam to defoam, a problem arises in that the time required for the draining operation to drain the washing water from the outer tub 2 becomes longer. If a water overflow path is not provided, it is necessary to prevent not only the overflow of washing water but also the overflow of foam.

In order to solve this problem, in the washing machine 100 according to the first embodiment, as shown in FIGS. 3 and 4, the defoaming heater (heating means) 50 for defoaming the foam is installed so that the foam does not accumulate. It shall be installed inside the outer tank 2 where it is easy to use. The defoaming heater 50 may be used either when excessive foam is unintentionally generated or when foam is intentionally generated to actively utilize the cleaning action of the foam. When foam is intentionally generated using a foam generating means during the cleaning process, the amount of foam can be appropriately adjusted by activating the defoaming heater 50.

The foam created by the detergent solution containing the detergent contains water and surfactant. The inside and outside of the bubble are separated by a foam membrane whose main component is water. The surfactant exists in an oriented state at the interface of the foam film, with the hydrophilic group facing the water phase side and the hydrophobic group facing the gas phase side. When foam with such a structure is heated, water evaporates and the foam film becomes thinner. Therefore, the foam can be forcibly broken by heating by the defoaming heater 50.

By providing the defoaming heater 50, it is possible to directly heat the foam inside the outer tank 2. Therefore, whether a large amount of foam is generated unintentionally or intentionally, the foam inside the outer tank 2 can be quickly removed without extending the operating time or adding water. can be defoamed. Moreover, the load on the motor 4 due to bubbles can be reduced during the dehydration process after the cleaning process. Therefore, while the foam can be used for washing in a state where the washing action is fully exerted, normal operation can be performed without extending the operating time or adding water supply.

In general, a method of heating the washing water stored in the outer tub 2 can be considered as a method of breaking the foam. However, the method of heating the entire washing water takes a lot of time and energy to defoam excess foam. If the foam is directly heated with the defoaming heater 50, the time and energy required for the defoaming process can be reduced compared to the method of heating washing water with a hot water heater or the like.

The defoaming heater 50 may be placed inside the outer tank 2 above the vicinity of the specified water level (L1), as shown in FIG. 3, or above the specified water level (L1), as shown in FIG. It may be placed below the vicinity. Further, it may be arranged both above and below the vicinity of the specified water level (L1). The defoaming heater 50 is preferably placed inside the outer tank 2 and outside the drum 3 so as not to interfere with the drum 3.

The specified water level means the standard water level that the outer tub 2 reaches during the washing process. During the washing process, the water level of the washing water in the outer tub 2 is adjusted using a specified water level as a target value. The specified water level is set in advance according to the model of the washing machine, the shape of the outer tub 2, the capacity of the outer tub 2, etc. so that the laundry loaded into the drum 3 is immersed in the washing water. Near the specified water level means a height range within ±5 cm with respect to the specified water level.

As shown in FIG. 3, when the defoaming heater 50 is disposed above the vicinity of the specified water level (L1), the outer tank 2 is expanded radially outward to provide a location for the defoaming heater 50. be able to. In FIG. 3, the defoaming heater 50 is provided only on one side of the left and right sides with respect to the central axis of the outer tank 2, but it may be provided on the other side of the left and right, or on both the left and right sides. may be provided.

The defoaming heater 50 may be placed on the front inner surface of the outer tank 2, the rear inner surface of the outer tank 2, or both. When the defoaming heater 50 does not interfere with the drum 3, it may be arranged above the vicinity of the specified water level (L1) without expanding the existing outer tank 2. However, from the viewpoint of efficiently performing the defoaming process, it is preferable that the defoaming heater 50 be disposed at least on the outside of the drum 3 in the radial direction.

When the defoaming heater 50 is placed above the vicinity of the specified water level (L1), it is possible to directly heat the foam above the surface of the washing water stored in the outer tub 2. Since only the foam can be heated without heating the washing water, the defoaming process can be performed with the minimum amount of energy required. Since the washing water is not heated unnecessarily, it is also possible to operate the defoaming heater 50 during the washing process. When activated during the cleaning process, the amount of foam can be controlled to a constant level through the balance between foaming and defoaming, making it possible to proactively utilize the cleaning action of foam while avoiding problems caused by foam.

As shown in FIG. 4, when the defoaming heater 50 is disposed below the vicinity of the specified water level (L1), after it is detected that the water level in the outer tank 2 has fallen below the defoaming heater 50, the defoaming heater 50 is extinguished. It is preferable to operate the foam heater 50. When the defoaming heater 50 is disposed below near the specified water level (L1), the water receiver 2b at the lower part of the outer tank 2 can be used as the location for defoaming heater 50. Alternatively, the outer tank 2 can be expanded radially outward below the vicinity of the specified water level (L1) to provide a location for the defoaming heater 50.

When the defoaming heater 50 is arranged below the vicinity of the specified water level (L1), when the washing water is stored in the outer tub 2, the washing water together with the foam can be directly heated. On the other hand, when washing water is not stored in the outer tub 2, the foam accumulated in the lower part of the outer tub 2 can be directly heated. Therefore, depending on the operating process, defoaming process and hot water washing can be performed with the minimum necessary energy. The defoaming heater 50 arranged below the vicinity of the specified water level (L1) can also be used as a hot water heater that heats the washing water stored in the outer tub 2.

When the washing machine is equipped with an overflow path (overflow pipe 25, external drain pipe 24), the defoaming heater 50 may be placed above the overflow water level (L2), or may be placed above the overflow water level (L2). may also be placed below. Further, it may be arranged both above and below the overflow water level (L2). When disposed above the vicinity of the specified water level (L1) and above or below the overflow water level (L2), the defoaming heater 50 is placed above the vicinity of the specified water level (L1). It is possible to provide a location for the installation.

The overflow water level means the water level that reaches the highest water level when the outer tank 2 overflows. The overflow water level is determined by the height of the overflow port 2e of the outer tank 2, which is connected to the overflow path (overflow pipe 25, external drainage pipe 24). When the washing water in the outer tub 2 reaches the overflow water level, it is forcibly discharged from the overflow port 2e, so that the water level is prevented from exceeding the overflow water level.

When the defoaming heater 50 is arranged above the overflow water level (L2), it is possible to directly heat the foam at a height that the washing water stored in the outer tub 2 cannot reach. Only the foam that is likely to overflow from the outer tub 2 can be heated without heating the washing water. Therefore, a defoaming process specialized for preventing foam leakage can be performed with the minimum amount of energy required.

Further, the washing machine 100 according to the first embodiment includes a foam sensor (foam detection means) 55 that detects foam generated in the outer tub 2. The bubble sensor 55 is provided on the inner surface of the air duct 27. The bubble sensor 55 includes a pair of first electrodes 55a and second electrodes 55b. The first electrode 55a and the second electrode 55b are arranged at different heights in the air duct 27.

The bubble sensor 55 detects bubbles by detecting electrical continuity between the first electrode 55a and the second electrode 55b. When the bubbles generated in the outer tank 2 rise to a height exceeding the first electrode 55a and the second electrode 55b, conduction occurs between the first electrode 55a and the second electrode 55b, so that excessive bubble generation is detected. be done. Although the bubble sensor 55 is configured with two electrodes in FIGS. 3 and 4, it may be configured with three or more electrodes.

The first electrode 55a and the second electrode 55b are preferably provided above the overflow water level (L2) and below the blower 41 and the dry air heater 42 in the blower duct 27. With this arrangement, it is possible to detect in advance the risk that bubbles rising through the air duct 27 will come into contact with electrical components such as the air blower 41 and the dry air heater 42.

Additionally, the washing machine 100 according to the first embodiment includes a defoaming heater control device (control means) not shown. The defoaming heater control device controls the operation and stopping of the defoaming heater 50 according to the detection result by the foam sensor 55. The defoaming heater control device stops the defoaming heater 50 when the foam sensor 55 detects foam. On the other hand, when no bubbles are detected by the bubble sensor 55, the defoaming heater 50 is activated or stopped depending on the operating process.

According to the defoaming heater control device, the operation and stop of the defoaming heater 50 can be controlled depending on the state of foam generation in the outer tank 2. Therefore, the defoaming process using the defoaming heater 50 can be performed efficiently while suppressing wasted energy. Moreover, since it is based on the detection result by the bubble sensor 55, it is possible to reliably prevent electrical components from breaking down due to excessive bubbles generated in the outer tank 2.

As the defoaming heater 50, it is preferable to use a PTC (Positive Temperature Coefficient) heater. The PTC heater has a heat generating part that generates heat when energized. The heat generating portion is formed by mixing a semiconductor such as barium titanate and a particulate conductive material, for example. The heat-generating portion exhibits a characteristic in which its electrical resistance increases rapidly when it reaches a predetermined Curie temperature.

A sheathed heater is generally used as a hot water heater. However, the sheathed heater reaches a high temperature of over 500° C., depending on the specifications. The sheathed heater is usually provided at the lower part of the outer tub 2 at a location where it is immersed in the washing water. When such a sheathed heater is operated in a gas phase, excessive heat is generated. Therefore, when a sheathed heater is used as a defoaming heater, safety during heating is a concern.

On the other hand, according to the PTC heater, by adjusting the Curie temperature, it is possible to self-control so that the heat generation stops when the heat generating part reaches a predetermined temperature. With a PTC heater, excessive heat generation can be suppressed by self-control even when operating in a gas phase. Therefore, thermal deformation and burnout of the defoaming heater 50 and surrounding components can be avoided, and safety during heating can be ensured.

It is preferable that the defoaming heater 50 is waterproof so that it can be submerged in water. Examples of waterproof specifications include a structure in which the heat generating part is housed in a housing and sealed with a sealant or the like, and a structure in which the heat generating part is sealed with a film material such as a laminate film. With the waterproof specification, it is possible to avoid failure of the defoaming heater 50 due to contact with the washing water, even if it is used either above or below the surface of the washing water stored in the outer tub 2.

It is preferable that a plurality of defoaming heaters 50 are arranged inside the outer tank 2. The plurality of defoaming heaters 50 may be arranged at mutually different heights inside the outer tank 2, or may be arranged at mutually equivalent heights. Further, the plurality of defoaming heaters 50 may be controlled to different temperatures from each other, or may be controlled to the same temperature.

By providing a plurality of defoaming heaters 50, excess foam generated in the outer tank 2 can be heated over a wide range. Therefore, the defoaming process can be performed quickly and reliably. From the viewpoint of heating the foam over a wider range, it is preferable that the plurality of defoaming heaters 50 be disposed in a distributed manner at opposing positions across the center of the outer tub 2 in a plan view of the washing machine 100.

6A, FIG. 6B, and FIG. 6C are diagrams showing examples of the configuration of the defoaming heater. 6A, FIG. 6B, and FIG. 6C show a defoaming heater 50 including a heat transfer plate 52.
As shown in FIGS. 6A, 6B, and 6C, the defoaming heater (heating means) 50 for defoaming the foam inside the outer tank 2 includes a heat generating part 51 and a heat transfer plate 52. You can also use

The heat exchanger plate 52 is thermally connected to the heat generating part 51, which is a part that generates heat. Heat exchanger plate 52 is used to directly heat the foam. The heat exchanger plate 52 can be joined to the heat generating portion 51 by an appropriate method such as mechanical joining, welding, brazing, or the like. The heat transfer plate 52 can be provided in an appropriate shape, area, and thickness, such as a rectangular flat plate, a polygonal flat plate, a circular flat plate, and an elliptical flat plate.

Fins 53 may be formed on the heat exchanger plate 52. The fins 53 may be joined to the heat exchanger plate 52 by an appropriate method such as welding or brazing, or may be formed integrally with the heat exchanger plate 52. The fins 53 can be provided in an appropriate shape, width, height, and pitch.

The materials for the heat transfer plate 52 and the fins 53 are preferably materials that are resistant to corrosion by washing water and have high thermal conductivity. Examples of materials for the heat exchanger plate 52 and the fins 53 include metals such as copper, copper alloy, aluminum, aluminum alloy, and stainless steel.

It is preferable that the heat transfer plate 52 has a heat transfer surface that directly contacts the bubbles and has a larger heat transfer area than the defoaming heater 50. It is preferable that the maximum projected area of the heat exchanger plate 52 be larger than the maximum projected area of the defoaming heater 50. In FIGS. 6A, 6B, and 6C, the projected area of the heat exchanger plate 52 is maximum when the vertical direction is the projection direction.

When the defoaming heater 50 is provided with a heat transfer plate 52 and fins 53, a wider range of foam can be directly heated. In particular, if the maximum projected area of the heat transfer plate 52 is larger than the maximum projected area of the defoaming heater 50, an efficient defoaming process can be achieved while suppressing the number of installed defoaming heaters 50 and the cost. It can be carried out.

The defoaming heater 50A shown in FIG. 6A includes a heat generating part 51 and a heat transfer plate 52 thermally connected to one surface of the heat generating part 51. According to the embodiment shown in FIG. 6A, bubbles can be directly heated with a simple structure.

The defoaming heater 50B shown in FIG. 6B includes a heat generating section 51, a heat transfer plate 52 thermally connected to one surface of the heat generating section 51, and fins 53 provided on the heat transfer plate 52. ing. According to the embodiment shown in FIG. 6B, the heat transfer area is expanded by the fins 53, so that the foam can be quickly heated. Moreover, since washing water and foam are easily trapped between the fins 53, it is possible to perform an efficient defoaming process by suppressing the convection of washing water and the movement of foam.

The defoaming heater 50C shown in FIG. 6C includes a heat generating section 51, a heat transfer plate 52 thermally connected to both sides of the heat generating section 51, and fins 53 provided on the heat transfer plate 52. ing. According to the form shown in FIG. 6C, the heat transfer area is expanded on both sides of the heat generating part 51, so that the bubbles can be quickly heated. In particular, when the heater is used both as a defoaming heater and a hot water heater, the washing water stored in the outer tub 2 and the foam near the water surface can be efficiently heated.

FIG. 7 is a flowchart showing an example of operation of the washing machine according to the first embodiment.
As shown in FIG. 7, the defoaming heater 50 can be operated in the washing process of washing laundry in the drum 3 before the draining process. In this operation example, the defoaming heater 50 may be placed at any height inside the outer tank 2.

First, water is supplied to the washing machine 100, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S10). The detergents put into the detergent container are accompanied by the supplied water and are dissolved by stirring by the drum 3 and the circulation pump 21. Water in which detergents are dissolved is stored up to a specified water level (L1) and allowed to permeate the laundry.

Next, a washing process is started, and the laundry is washed by rotating the drum 3 (step S11). While the laundry is being washed, bubbles are generated inside the outer tub 2 due to agitation by the drum 3. Further, when actively utilizing the cleaning action of foam, foam is generated inside the outer tank 2 by the foam generating means. When excessive bubbles are generated inside the outer tank 2, they rise above the specified water level (L1).

Subsequently, during the cleaning process, it is detected whether the amount of bubbles generated inside the outer tank 2 exceeds a predetermined first threshold (step S12). The amount of bubbles generated inside the outer tank 2 can be indirectly detected by the bubble sensor 55 as the bubbles reach a predetermined height.

As a result of the detection, if the amount of bubbles generated inside the outer tank 2 is less than or equal to the first threshold (step S12; No), the process returns to step S11. Since the foam inside the outer tank 2 is not excessive, cleaning accompanied by the rotation of the drum 3 and foam generation by the foam generation means can be continued.

On the other hand, as a result of the detection, when the amount of bubbles generated inside the outer tank 2 exceeds the first threshold value (step S12; YES), the defoaming heater 50 is activated (step S13). Since the foam inside the outer tank 2 is excessive, a defoaming process is started in which the foam is broken by heating by the defoaming heater 50. The heating of the foam by the defoaming heater 50 may be performed continuously or intermittently during the defoaming process.

Subsequently, during the defoaming process, control to rotate the drum 3 is executed (step S14). In step S14, it is preferable that the rotational speed of the drum 3 is lower than that when washing or dehydrating laundry. When the drum 3 rotates at a low speed, foaming of the washing water due to agitation by the drum 3 is suppressed.

When the drum 3 is rotated during the defoaming process, the foam near the peripheral wall of the drum 3 can be moved along with the rotation of the drum 3. Foam near the peripheral wall of the drum 3 is collected near the surface of the washing water near the defoaming heater 50 by the rotation of the drum 3. Alternatively, it is transferred near the defoaming heater 50. Inside the outer tank 2, the unevenness of the bubbles is reduced and the bubbles are more likely to come into direct contact with the defoaming heater 50, making it possible to perform an efficient defoaming process.

Subsequently, during the defoaming process, it is determined whether a condition for stopping the defoaming heater 50 has been reached (step S15). As the stop condition, it can be determined whether the amount of bubbles generated inside the outer tank 2 is less than a predetermined second threshold value or whether the implementation time of the defoaming process has reached a predetermined time. The first threshold value and the second threshold value may be different from each other or may be the same as each other.

As a result of the determination, if the condition for stopping the defoaming heater 50 has not been reached (step S15; No), the process returns to step S14. When the amount of foam generated inside the outer tank 2 exceeds the second threshold or when the defoaming process has not reached the predetermined time, excessive foam remains inside the outer tank 2. Therefore, the defoaming heater 50 continues to heat the foam.

On the other hand, as a result of the determination, when the condition for stopping the defoaming heater 50 is reached (step S15; YES), the defoaming heater 50 is stopped (step S16). When the amount of foam generated inside the outer tank 2 is less than the second threshold value or when the time for performing the defoaming process has reached a predetermined time, heating of the foam by the defoaming heater 50 is terminated.

Next, the washing water stored in the outer tub 2 is drained (step S17). Next, the laundry is intermediately dehydrated by rotating the drum 3 (step S18). Next, the supplied water is introduced into the outer tub 2 to rinse the laundry, and the drum 3 is rotated to finally dewater the laundry (step S19). Thereafter, the operation of the washing process is ended.

When such a washing process is performed, excess foam generated in the outer tub 2 during washing of laundry can be forcibly defoamed by the defoaming heater 50. By heating by the defoaming heater 50, water contained in the foam evaporates, and the apparent volume of the foam rapidly decreases. Since the defoaming process is performed before the draining process, the foam accumulated on the surface of the washing water can be quickly defoamed. By controlling the defoaming heater 50 and the foam generating means, the cleaning process can be performed while maintaining an appropriate amount of foam and actively utilizing the friction reducing effect and oil adsorption effect of the foam.

In addition, in FIG. 7, in step S14, control is executed to rotate the drum 3 during the defoaming process, but step S14 may be omitted depending on the arrangement of the defoaming heater 50, etc. can. As the first threshold value and the second threshold value, an appropriate index corresponding to the amount of bubbles, the height of bubbles, the resistivity of bubbles, etc. can be used. Further, in the washing process shown in FIG. 7, the foam generation means does not necessarily need to generate foam.

FIG. 8 is a flowchart showing an example of operation of the washing machine according to the first embodiment.
As shown in FIG. 8, the defoaming heater 50 can also be operated after the draining process in the washing process of washing the laundry in the drum 3. In this operation example, the defoaming heater 50 may be placed at any height inside the outer tank 2.

First, water is supplied to the washing machine 100, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S20). The detergents put into the detergent container are accompanied by the supplied water and are dissolved by stirring by the drum 3 and the circulation pump 21. Water in which detergents are dissolved is stored up to a specified water level (L1) and allowed to permeate the laundry.

Next, a washing process is started, and the laundry is washed by rotating the drum 3 (step S21). While the laundry is being washed, bubbles are generated inside the outer tub 2 due to agitation by the drum 3. Further, when actively utilizing the cleaning action of foam, foam is generated inside the outer tank 2 by the foam generating means. When excessive bubbles are generated inside the outer tank 2, they rise above the specified water level (L1).

Next, the washing water stored in the outer tub 2 is drained (step S22). A part of the bubbles generated inside the outer tub 2 is discharged from the outer tub 2 along with the washing water. However, if excessive foam is generated, a large amount of foam remains inside the outer tank 2.

Subsequently, after the drainage process, it is detected whether the water level in the outer tank 2 is below a predetermined third threshold (step S23). After the drainage process, the amount of foam generated inside the outer tank 2 can be indirectly detected as a change in water level using a general water level sensor.

As the water level sensor, an existing sensor that detects the pressure of air inside the tube can be used. When the air inside the tube is displaced by the pressure inside the outer tank 2, a change in air pressure is detected. Therefore, it is possible to know not only the water level of the washing water but also the amount of bubbles that cause pressure fluctuations. After the drainage process, the amount of foam accumulated in the lower part of the outer tank 2 is detected as the water level.

As a result of the detection, if the water level in the outer tank 2 is below the predetermined third threshold (step S23; No), the process returns to step S22. Since the foam inside the outer tank 2 is not excessive, cleaning accompanied by the rotation of the drum 3 and foam generation by the foam generation means can be continued.

On the other hand, as a result of the detection, when the water level in the outer tank 2 exceeds the third threshold (step S23; YES), the defoaming heater 50 is activated (step S24). Since the foam inside the outer tank 2 is excessive, a defoaming process using the defoaming heater 50 is started. The heating of the foam by the defoaming heater 50 may be performed continuously or intermittently during the defoaming process.

Subsequently, during the defoaming process, it is determined whether a condition for stopping the defoaming heater 50 has been reached (step S25). As the stop condition, it can be determined whether the amount of bubbles generated inside the outer tank 2 is less than a predetermined fourth threshold value or whether the implementation time of the defoaming process has reached a predetermined time. The third threshold and the fourth threshold may be different from each other or may be the same.

As a result of the determination, if the condition for stopping the defoaming heater 50 has not been reached (step S25; No), the process returns to step S24. When the amount of foam generated inside the outer tank 2 exceeds the fourth threshold, or when the time for performing the defoaming process has not reached the predetermined time, excessive foam remains inside the outer tank 2. Therefore, the defoaming heater 50 continues to heat the foam.

On the other hand, as a result of the determination, when the condition for stopping the defoaming heater 50 is reached (step S25; YES), the defoaming heater 50 is stopped (step S26). When the amount of foam generated inside the outer tank 2 is less than the fourth threshold value or when the time for performing the defoaming process has reached a predetermined time, heating of the foam by the defoaming heater 50 is terminated.

Next, the drum 3 is rotated to intermediately dehydrate the laundry (step S27). Next, the supplied water is introduced into the outer tub 2 to rinse the laundry, and the drum 3 is rotated to finally dewater the laundry (step S28). Thereafter, the operation of the washing process is ended.

When such a washing process is performed, excess foam generated in the outer tub 2 during washing of laundry can be forcibly defoamed by the defoaming heater 50. By heating by the defoaming heater 50, water contained in the foam evaporates, and the apparent volume of the foam rapidly decreases. Since the defoaming process is performed after the draining process, the foam remaining in the outer tub 2 after the washing water is drained can be quickly defoamed. The rinsing process and dehydration process after the cleaning process can be started immediately without extending the drainage process or requiring additional water supply.

In FIG. 8, the defoaming heater 50 is activated after the drainage process, but the defoaming process before the drainage process as shown in FIG. 7 and the defoaming process after the drainage process as shown in FIG. may be executed in combination. Further, in the washing process shown in FIG. 8, the foam generation means does not need to generate foam.

FIG. 9A is a diagram showing the power consumption-temperature characteristics of the defoaming heater. FIG. 9B is a diagram showing the relationship between power consumption and temperature of the defoaming heater during operation. 9A and 9B show the behavior of the PTC heater used as the defoaming heater 50.
As shown in FIGS. 9A and 9B, the PTC heater has a property that the power consumption-temperature characteristics vary depending on the state of the heat generating part during operation. Since it is self-controlled so that heat generation stops when a predetermined temperature is reached, it is affected by the temperature, heat capacity, etc. of the object to be heated that is in contact with the heat generating part.

As shown in FIG. 9A, the temperature of the PTC heater increases toward a predetermined Curie temperature as the energization time elapses. On the other hand, the power consumption of the PTC heater decreases as the energization time elapses. As the temperature and power consumption of the PTC heater approach the Curie temperature, they become less likely to change and become steady.

On the other hand, as shown in FIG. 9B, when the PTC heater is in operation, the temperature of the PTC heater becomes less likely to rise over time compared to its original characteristics. Furthermore, the power consumption of the PTC heater becomes less likely to decrease as the energization time elapses compared to its original characteristics. When the PTC heater is in operation, the object to be heated is being heated, which causes a change in the original power consumption-temperature characteristics.

Therefore, when a PTC heater is used as the defoaming heater 50, the presence of foam, which is the object to be heated, and the amount of foam can be indirectly detected based on the power consumption, current, and voltage of the PTC heater. . When such a PTC heater is used, appropriate control can be performed according to the state of foam during the defoaming process.

When the washing machine 100 according to the first embodiment uses a PTC heater as the defoaming heater 50, the defoaming heater 50 controls the operation and stop of the defoaming heater 50 according to the power consumption of the defoaming heater 50. It can be provided with a control device (control means), an ammeter that detects the current applied to the defoaming heater 50, and a voltmeter that detects the voltage applied to the defoaming heater 50.

The defoaming heater control device (control means) performs control to continue energizing the defoaming heater 50 when the power consumption of the defoaming heater 50 exceeds a predetermined threshold (Wt). On the other hand, if it is below a predetermined threshold value (Wt), control is performed to stop energizing the defoaming heater 50. When using such a PTC heater, the bubble sensor 55 may not be used, or the bubble sensor 55 may be used together.

FIG. 10 is a flowchart showing an example of operation of the washing machine according to the first embodiment.
As shown in FIG. 10, when the defoaming heater 50 uses a PTC heater, the stop timing can also be controlled according to power consumption. In this operation example, the defoaming heater 50 may be placed at any height inside the outer tank 2.

First, water is supplied to the washing machine 100, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S30). The detergents put into the detergent container are accompanied by the supplied water and are dissolved by stirring by the drum 3 and the circulation pump 21. Water in which detergents are dissolved is stored up to a specified water level (L1) and allowed to permeate the laundry.

Next, the washing process is started, and the laundry is washed by rotating the drum 3 (step S31). While the laundry is being washed, bubbles are generated inside the outer tub 2 due to agitation by the drum 3. Further, when actively utilizing the cleaning action of foam, foam is generated inside the outer tank 2 by the foam generating means. When excessive bubbles are generated inside the outer tank 2, they rise above the specified water level (L1).

Next, the washing water stored in the outer tub 2 is drained (step S32). A part of the bubbles generated inside the outer tub 2 is discharged from the outer tub 2 along with the washing water. However, if excessive foam is generated, a large amount of foam remains inside the outer tank 2.

Subsequently, after the drainage process, it is detected whether the water level in the outer tank 2 is below a predetermined fifth threshold (step S33). After the drainage process, the amount of foam generated inside the outer tank 2 can be indirectly detected as a change in water level using a general water level sensor.

As a result of the detection, if the water level in the outer tank 2 does not exceed the predetermined fifth threshold (step S33; No), the process returns to step S32. Since the foam inside the outer tank 2 is not excessive, cleaning accompanied by the rotation of the drum 3 and foam generation by the foam generation means can be continued.

On the other hand, as a result of the detection, when the water level in the outer tank 2 is below the fifth threshold (step S33; YES), the defoaming heater 50 is activated (step S34). Since the foam inside the outer tank 2 is excessive, a defoaming process using the defoaming heater 50 is started. The heating of the foam by the defoaming heater 50 may be performed continuously or intermittently during the defoaming process.

Subsequently, during the defoaming process, it is determined whether the power consumption of the defoaming heater 50 is less than a predetermined sixth threshold (step S35). If the current value and voltage value are known, the power consumption of the defoaming heater 50 can be determined indirectly based on the measurement of the voltage and current.

As a result of the determination, if the power consumption of the defoaming heater 50 is equal to or greater than the sixth threshold (step S35; No), the process returns to step S34. Since excessive foam, which is the object to be heated by the defoaming heater 50, remains inside the outer tank 2, heating of the foam by the defoaming heater 50 is continued.

On the other hand, as a result of the determination, when the power consumption of the defoaming heater 50 is less than the sixth threshold value (step S35; YES), the defoaming heater 50 is stopped (step S36). Since no excess foam, which is the object to be heated by the defoaming heater 50, remains inside the outer tank 2, the heating of the foam by the defoaming heater 50 is terminated.

Next, the drum 3 is rotated to intermediately dehydrate the laundry (step S37). Next, the supplied water is introduced into the outer tub 2 to rinse the laundry, and the drum 3 is rotated to finally dewater the laundry (step S38). Thereafter, the operation of the washing process is ended.

When such a washing process is performed, excess foam generated in the outer tub 2 during washing of laundry can be forcibly defoamed by the defoaming heater 50. By heating by the defoaming heater 50, water contained in the foam evaporates, and the apparent volume of the foam rapidly decreases. Since the defoaming process is controlled based on the power consumption of the defoaming heater 50, appropriate control can be performed according to the state of the foam during the defoaming process.

In addition, in FIG. 10, the defoaming heater 50 is operated based on the water level of the outer tank 2, but the defoaming heater 50 may also be operated based on the amount of foam generated inside the outer tank 2. good. When controlling based on the power consumption of the defoaming heater 50, it is preferable that the defoaming heater 50 is not in contact with the washing water.

Next, a washing machine according to a second embodiment, which is different from the first embodiment described above, will be described with reference to the drawings.

FIG. 11 is a sectional front view showing the inside of the washing machine according to the second embodiment. FIG. 11 shows an example of the internal structure of the washing machine according to the second embodiment in a state where washing water is foamed. In FIG. 11, the one-dot chain line L1 indicates the specified water level, and the two-dot chain line L2 indicates the overflow water level.
As shown in FIG. 11, a washing machine 200 according to the second embodiment includes a defoaming device 70 that defoams using mechanical force. The defoaming device 70 is arranged inside the outer tank 2 in FIG. Washing machine 200 has the same structure as washing machine 100 described above, except for defoaming device 70 .

The defoaming device 70 has a function of forcibly defoaming the foam generated inside the outer tank 2 using mechanical force. The defoaming device 70 includes a defoaming section that generates mechanical force to defoam foam. The defoaming section is provided in a structure that allows bubbles to come into contact with it. The defoaming part is movably provided and driven to perform a predetermined movement that generates mechanical force.

According to the defoaming device 70, a predetermined movement is driven to generate mechanical force, so that mechanical force such as shear force can be actively applied to the bubbles that come into contact with it. Therefore, the bubbles generated inside the outer tank 2 can be quickly broken by mechanical force. In addition, in FIG. 11, a centrifugal fan is provided as the defoaming device 70. A centrifugal fan is equipped with an impeller as a defoaming section that generates mechanical force.

To deal with the problem caused by the foam, in the washing machine 200 according to the second embodiment, as shown in FIG. 11, a defoaming device 70 for defoaming the foam is provided at a location where the foam is likely to accumulate. . The defoaming device 70 may be used either when excessive foam is unintentionally generated or when foam is intentionally generated to actively utilize the cleaning action of the foam. When foam is intentionally generated using a foam generating means during the cleaning process, the amount of foam can be adjusted appropriately by activating the defoaming device 70.

The foam created by the detergent solution containing the detergent contains water and surfactant. The inside and outside of the bubble are separated by a foam membrane whose main component is water. The surfactant exists in an oriented state at the interface of the foam film, with the hydrophilic group facing the water phase side and the hydrophobic group facing the gas phase side. When a mechanical force is applied to a foam having such a structure, a shearing force is applied to the foam film and a stirring force is applied to the surfactant molecules. Therefore, the foam can be forcibly broken by the mechanical force of the defoaming device 70.

If the defoaming device 70 is provided, it is possible to actively break the foam generated by the foaming of the washing water. In both cases where a large amount of foam is generated unintentionally and when foam is intentionally generated, the foam can be quickly extinguished without extending operating time or adding water. Moreover, the load on the motor 4 due to bubbles can be reduced during the dehydration process after the cleaning process. Therefore, while the foam can be used for washing in a state where the washing action is fully exerted, normal operation can be performed without extending the operating time or adding water supply. Since the foam can be actively defoamed, there is no need to supply water or the like to the ventilation path inside the washing machine for defoaming the foam.

It is preferable that the defoaming device 70 be arranged inside the outer tank 2 above the vicinity of the specified water level (L1). Moreover, it is preferable to arrange it on the outside of the drum 3 inside the outer tank 2 so as not to interfere with the drum 3. When a collision or the like due to the mechanical force of the defoaming device 70 is applied to the surface of the washing water, agitation between the washing water and the gas is promoted. Therefore, there is a possibility that the washing water may foam instead of defoaming. However, if the defoaming device 70 is arranged above the vicinity of the specified water level (L1), foaming of the washing water due to the operation of the defoaming device 70 can be avoided.

As shown in FIG. 11, when the defoaming device 70 is arranged inside the outer tank 2, the outer tank 2 can be expanded radially outward to provide a location for the defoaming device 70. In FIG. 11, the defoaming device 70 is provided only on one side of the left and right with respect to the central axis of the outer tank 2, but it may be provided on the other side of the left and right, or on both the left and right. may be provided.

The defoaming device 70 may be placed on the front inner surface of the outer tank 2, the rear inner surface of the outer tank 2, or both. If the defoaming device 70 does not interfere with the drum 3, it may be arranged above the vicinity of the specified water level (L1) without expanding the existing outer tank 2. However, from the viewpoint of efficiently performing the defoaming process, it is preferable that the defoaming device 70 be disposed at least on the outside of the drum 3 in the radial direction.

As shown in FIG. 11, when the defoaming device 70 is placed inside the outer tank 2, the bubbles generated inside the outer tank 2 can be broken inside the outer tank 2. The height of the bubbles can be suppressed inside the outer tank 2 before the bubbles rise up inside the ventilation duct 27. Moreover, compared to the case where the defoaming device 70 is disposed outside the outer tub 2, the defoaming device 70 can be placed closer to the water surface of the washing liquid. Bubbles tend to accumulate near the water surface of the washing liquid. Therefore, the load on the motor 4 due to bubbles can be reduced. Further, if the defoaming device 70 is close to the water surface of the washing liquid, when the defoaming device 70 and the foam generating means are operated during the washing process, the amount of foam can be kept constant due to the balance between foaming and defoaming. Since the cleaning action of the foam can be actively used while avoiding the problems caused by the foam.

When the washing machine is equipped with an overflow path (overflow pipe 25, external drain pipe 24), the defoaming device 70 may be placed above the overflow water level (L2), or may be placed above the overflow water level (L2). It may be placed below. Further, it may be arranged both above and below the overflow water level (L2). When disposed above the vicinity of the specified water level (L1) and above or below the overflow water level (L2), the defoaming device 70 A location can be provided.

When the defoaming device 70 is placed above the overflow water level (L2), it is possible to directly break the foam at a height that the washing water stored in the outer tub 2 cannot reach. The defoaming device 70 can break only the foam that is likely to overflow from the outer tub 2 without coming into contact with the washing water stored in the outer tub 2. Therefore, while avoiding foaming of the washing water due to the mechanical force of the defoaming device 70, a defoaming process specialized for preventing foam leakage can be performed.

Further, the washing machine 200 according to the second embodiment includes a defoaming control device (control means) not shown. The defoaming control device controls the operation and stopping of the defoaming device 70 according to the detection result by the foam sensor 55. The defoaming control device stops the defoaming device 70 when foam is detected by the foam sensor 55. On the other hand, when no foam is detected by the foam sensor 55, the defoaming device 70 is activated or stopped depending on the operating process.

According to the defoaming control device, the operation and stop of the defoaming device 70 can be controlled depending on the state of foam generation in the outer tank 2. Therefore, the defoaming process by the defoaming device 70 can be performed efficiently while suppressing wasted energy. Moreover, since it is based on the detection result by the bubble sensor 55, it is possible to reliably prevent electrical components from breaking down due to excessive bubbles generated in the outer tank 2.

As long as the defoaming device 70 has the function of defoaming foam using mechanical force, it can generate mechanical force for defoaming foam by appropriate movement. For example, the defoaming device 70 can generate mechanical force through rotational movement, translational movement, reciprocating movement, vibrational movement, and the like. From the viewpoint of appropriately controlling the defoaming process, the defoaming device 70 is preferably a device that uses electric power to generate mechanical force for defoaming foam.

For example, rotational movement can be achieved by a motor. Translational motion can be realized by a combination of a motor and a mechanical mechanism such as a crank mechanism, slider mechanism, or cam mechanism. The reciprocating motion can be realized by a combination of a mechanical mechanism and switching of a coil or the like. Translational motion and reciprocating motion may be realized using a solenoid, a linear motor, or the like. The vibration motion can be realized using a mechanical mechanism, an ultrasonic vibrator, or the like.

The defoaming device 70 is preferably a device that generates mechanical force for defoaming foam through rotational motion. Rotational motion allows centrifugal force and frictional force to be applied to the bubbles that come into contact with them. Since shearing force can be applied to the foam membrane while suppressing foaming of the washing water, the foam can be efficiently broken. Furthermore, since it can be realized with a simple mechanical mechanism, installation space and costs can be reduced. Furthermore, since the mechanical force is increased by adjusting the rotational speed, the defoaming speed can be easily increased.

It is preferable that the defoaming device 70 is waterproof so that it can be submerged in water. An example of the waterproof specification is a structure in which the driving part that drives the movement of the defoaming part is sealed with a seal or the like. With the waterproof specification, even if the defoaming device 70 is installed in a place where it is likely to come into contact with washing water or the like, failure of the defoaming device 70 due to washing water or the like can be avoided.

When disposed inside the outer tank 2, it is particularly preferable to use a centrifugal fan as the defoaming device 70, as shown in FIG. Examples of centrifugal fans include turbo fans, sirocco fans, and spiral fans. The centrifugal fan may be a single-stage fan or a multi-stage fan. The centrifugal fan may be placed horizontally so that its rotating shaft faces left and right, or it may be placed vertically so that its rotating shaft faces up and down.

According to a centrifugal fan, the pressure inside the fan casing is increased, so a high-pressure suction force can be obtained. Therefore, the foam around the defoaming device 70 can be quickly and efficiently defoamed. In addition, foam is sucked into the fan casing, collected by centrifugal force, and then discharged from the fan casing as a detergent liquid. Since foam can be liquefied by centrifugal force, the kinetic energy of the liquefied detergent can be effectively utilized to further break the foam around the centrifugal fan, which is advantageous. Furthermore, even if the centrifugal fan cannot generate enough pressure to suck out the bubbles, driving the centrifugal fan can circulate the air inside the outer tank 2, so the moisture contained in the bubbles can be removed. This is advantageous in that it can promote evaporation and improve the defoaming rate.

FIG. 12 is a sectional side view showing the inside of the washing machine according to the second embodiment. FIG. 12 shows an example of the internal structure of the washing machine according to the second embodiment in a state where washing water is foamed.
As shown in FIG. 12, a defoaming device 70 that defoams using mechanical force can also be placed outside the outer tank 2. In FIG. 12, the defoaming device 70 is disposed outside the outer tank 2 and inside the ventilation duct 27, which is a ventilation path provided inside the box body 1.

It is preferable that the defoaming device 70 is placed above the vicinity of the specified water level (L1) on the outside of the outer tank 2. Moreover, it is preferable to arrange|position above an overflow water level (L2). Moreover, it is preferable to arrange|position above the upper end of the outer tank 2. With this arrangement, since the defoaming device 70 is separated from the surface of the washing water, foaming of the washing water due to the mechanical force of the defoaming device 70 or failure of the defoaming device 70 due to contact with the washing water can occur. can be avoided. It is also permissible to use a non-waterproof specification as the defoaming device 70.

It is preferable that the defoaming device 70 is disposed outside the outer tank 2 and downstream of the outer tank 2 and upstream of the blower 41 in the ventilation path provided inside the box 1. It is preferable that the defoaming device 70 is disposed outside the outer tank 2, particularly inside the ventilation duct 27. With this arrangement, it is possible to prevent bubbles from entering the upper part of the box 1 where electric components such as the blower 41, the dry air heater 42, and the control board 61 are arranged.

As shown in FIG. 12, when the defoaming device 70 is disposed inside the blower duct 27, which is the air blowing path, even if the bubbles generated inside the outer tank 2 rise up inside the blower duct 27, the blower 41, Bubbles can be broken before they come into contact with electrical components such as the drying air heater 42 and the control board 61. Further, the defoaming device 70 can be separated from the surface of the washing water. When the defoaming device 70 is operated, the interface between the washing water and the gas phase becomes less likely to be agitated, so that foaming of the washing water can be avoided.

Note that a plurality of defoaming devices 70 may be arranged inside the outer tank 2. Moreover, on the outside of the outer tank 2, a plurality of them may be arranged. The defoaming device 70 may be placed both inside and outside the outer tank 2. By providing a plurality of defoaming devices 70, excess foam generated in the outer tank 2 can be broken over a wide range. Therefore, the defoaming process can be performed quickly and reliably. From the viewpoint of breaking bubbles over a wider range, the plurality of defoaming devices 70 are distributed in opposing positions inside the outer tub 2 with the center of the outer tub 2 in a plan view of the washing machine 200 interposed therebetween. It is preferable that the

FIG. 13 is a diagram showing an example of a form of a defoaming device provided in a washing machine. FIG. 13 shows an example of a defoaming device 70 included in the washing machine 200, in which a mechanical force for defoaming foam is generated by rotational movement.
As shown in FIG. 13, when disposed inside the blower duct 27, the defoaming device 70 includes a defoaming section 71 that generates mechanical force to defoam foam, and a drive that drives the movement of the defoaming section 71. It is preferable to include a section 72 and a drive shaft 73 that connects the defoaming section 71 and the drive section 72 and supports the defoaming section 71 in a freely drivable manner. In addition, such a form may be arrange|positioned inside the outer tank 2.

The defoaming section 71 is preferably provided with a breathable structure that allows air to flow through it regardless of whether it is activated or stopped. If the defoaming part 71 is provided in a breathable structure, when it is arranged inside the ventilation duct 27, the air flowing inside the ventilation duct 27 will be less likely to be obstructed by the defoaming part 71. Therefore, the defoaming process on the ventilation path and the drying process of drying laundry can be performed in an energy-saving manner without significantly increasing the power consumption of the blower 41 due to pressure loss.

The breathable structure of the defoaming section 71 is preferably such that the direction of air flow is approximately parallel to the rotation axis of the defoaming section 71. With such a structure, while allowing air to flow through the air permeable structure, when the bubbles accompanying the air pass through the defoaming section 71, the bubbles are perpendicular to the direction in which the bubbles travel. mechanical force can be applied. Since shearing force can be applied to the foam film that is about to rise, the foam can be defoamed quickly and reliably.

The drive shaft 73 can be provided with an appropriate length depending on the height at which the bubbles are broken by the defoaming section 71, the arrangement of the drive section 72, etc. Providing the drive shaft 73 allows the defoaming section 71, which comes into direct contact with the foam, and the drive section 72, which is an electric component, to be separated from each other. Therefore, it is possible to break the foam near the surface of the washing water stored in the outer tub 2 while avoiding failure of the drive unit 72 due to contact with the foam or washing water.

When the defoaming device 70 is disposed inside the air duct 27, the defoaming unit 71 is preferably disposed at the same height as the foam sensor 55. For example, as shown in FIG. 12, the defoaming section 71 can be arranged at a height between the first electrode 55a and the second electrode 55b, or at a height equivalent to the second electrode 55b. With this arrangement, when bubbles generated inside the outer tank 2 rise up inside the ventilation duct 27, the height of the bubbles can be suppressed according to the detection result by the bubble sensor 55. .

In FIG. 13, the defoaming section 71 is provided in a wheel-like form (defoaming section 71A). The defoaming section 71A provided in a wheel shape includes a rim 71a provided in an annular shape at the tip of the drive shaft 73, and spokes 71b connecting the drive shaft 73 and the rim 71a. The rim 71a is provided around the tip of the drive shaft 73 and extends perpendicularly to the rotation axis. The spokes 71b connect the outer peripheral surface of the tip of the drive shaft 73 and the inner peripheral surface of the rim 71a.

The rim 71a and the spokes 71b can be formed of a wire rod, a plate material, or the like having a diameter as small as that of the drive shaft 73. The outer diameter of the rim 71a can be set as appropriate depending on the width of the air duct 27 and the like. A plurality of spokes 71b are provided at intervals along the circumferential direction of the rotating shaft. The number of spokes 71b and the circumferential width of the rotating shaft can be set as appropriate.

According to the wheel-shaped defoaming section 71A, the rotation of the drive shaft 73 causes the rim 71a to rotate and the spokes 71b to turn so as to cross the inside of the rim 71a. Therefore, the bubbles passing between the spokes 71b can be broken by collision of the spokes 71b or by shearing after adhering to the spokes 71b. Moreover, the bubbles that have come into contact with the rim 71a can be broken by shearing due to centrifugal force or the like after adhesion. Since the rim 71a and the spokes 71b do not easily obstruct air flow, they can suppress pressure loss and defoam.

FIG. 14 and FIG. 15 are diagrams showing an example of the form of a defoaming device provided in a washing machine. FIGS. 14 and 15 show an example of a defoaming device 70 included in the washing machine 200, in which a mechanical force for defoaming foam is generated by rotational movement.
As shown in FIGS. 14 and 15, the defoaming section 71 of the defoaming device 70 can be provided in an appropriate shape other than the wheel-like shape (71A) shown in FIG. 13.

In FIG. 14, the defoaming section 71 is provided in the form of an impeller (defoaming section 71B). The defoaming part 71B provided in the shape of an impeller includes a base 71c provided in the shape of a disk at the tip of the drive shaft 73, and blades 71d provided on the outside of the base 71c. The base 71c supports a plurality of blades 71d. The blade 71d is provided to be inclined with respect to the rotation axis.

The blade 71d can be formed from a plate material or the like. The outer diameter of the blade 71d can be set as appropriate depending on the width of the air duct 27 and the like. A plurality of blades 71d are provided along the circumferential direction of the rotating shaft. The shape, number, and width of the blades 71d in the circumferential direction of the rotating shaft can be set as appropriate. The blade 71d may be inclined with respect to the rotation axis, or may not be inclined with respect to the rotation axis. The shape and outer diameter of the base 71c can be set as appropriate. The base 71c may be omitted.

According to the defoaming section 71B provided in the shape of an impeller, the blades 71d rotate in the shape of an impeller by driving the rotation of the drive shaft 73. Therefore, the bubbles passing between the blades 71d can be broken by collision of the blades 71d or by shearing after adhering to the blades 71d. Furthermore, since the blades 71d have a larger area than the spokes 71b, they can reliably prevent bubbles from passing through. Further, since the blades 71d rectify the air, pressure loss can be suppressed and bubbles can be eliminated.

In FIG. 15, the defoaming section 71 is provided in a whipper-like form (defoaming section 71C). The defoaming section 71C provided in a whipper shape includes a core material 71e provided in an annular shape at the tip of the drive shaft 73, and a coil material 71f wound around the core material 71e. The core material 71e extends radially outward from the tip of the drive shaft 73, and is bent and stretched so as to have an annular shape on the radially outer side. The coil material 71f is wound in a coil shape around the core material 71e over the entire circumference of the ring.

The core material 71e and the coil material 71f can be formed of a wire rod or the like having a diameter as small as that of the drive shaft 73. Moreover, it may be formed by a plate material such as a ribbon shape or a combination of a wire rod and a plate material. The outer diameter of the core material 71e can be set as appropriate depending on the width of the ventilation duct 27 and the like. The number of turns, pitch, and radial width of the winding axis of the coil material 71f can be set as appropriate. The core material 71e and the coil material 71f may be integrally formed with each other or with the drive shaft 73.

According to the defoaming section 71C provided in a whipper shape, the core material 71e rotates by driving the rotation of the drive shaft 73, and the coil material 71f turns along the circumferential direction of the core material 71e. Therefore, the bubbles passing through the gap between the core members 71e can be broken by collision with the coil member 71f or by shearing after adhesion to the coil member 71f. Further, since the coil material 71f can make three-dimensional contact with the foam compared to the spokes 71b, the contact area with respect to the foam can be expanded and shearing force can be applied efficiently. Moreover, since the core material 71e and the coil material 71f do not easily obstruct air flow, they can suppress pressure loss and defoamer.

FIG. 16 is a flowchart showing an example of operation of the washing machine according to the second embodiment.
As shown in FIG. 16, the defoaming device 70 can be operated in the washing process of washing laundry in the drum 3 before the draining process. In this operation example, the defoaming device 70 is preferably disposed inside the outer tank 2.

First, water is supplied to the washing machine 200, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S40). The detergents put into the detergent container are accompanied by the supplied water and are dissolved by stirring by the drum 3 and the circulation pump 21. Water in which detergents are dissolved is stored up to a specified water level (L1) and allowed to permeate the laundry.

Next, the washing process is started, and the laundry is washed by rotating the drum 3 (step S41). While the laundry is being washed, bubbles are generated inside the outer tub 2 due to agitation by the drum 3. Further, when actively utilizing the cleaning action of foam, foam is generated inside the outer tank 2 by the foam generating means. When excessive bubbles are generated inside the outer tank 2, they rise above the specified water level (L1).

Subsequently, during the cleaning process, it is detected whether the amount of bubbles generated inside the outer tank 2 exceeds a predetermined seventh threshold (step S42). The amount of bubbles generated inside the outer tank 2 can be indirectly detected by the bubble sensor 55 as the bubbles reach a predetermined height.

As a result of the detection, if the amount of bubbles generated inside the outer tank 2 is equal to or less than the seventh threshold (step S42; No), the process returns to step S41. Since the foam inside the outer tank 2 is not excessive, cleaning accompanied by the rotation of the drum 3 and foam generation by the foam generation means can be continued.

On the other hand, as a result of the detection, when the amount of bubbles generated inside the outer tank 2 exceeds the seventh threshold (step S42; YES), the defoaming device 70 is activated (step S43). Since the foam inside the outer tank 2 is excessive, a defoaming process is started in which the foam is broken by the mechanical force of the defoaming device 70. The movement of the defoaming device 70 to generate mechanical force may be driven continuously or intermittently during the defoaming process.

Subsequently, during the defoaming process, control to rotate the drum 3 is executed (step S44). In step S44, it is preferable that the rotational speed of the drum 3 is lower than that when washing or dehydrating laundry. When the drum 3 rotates at a low speed, foaming of the washing water due to agitation by the drum 3 is suppressed.

When the drum 3 is rotated during the defoaming process, the foam near the peripheral wall of the drum 3 can be moved along with the rotation of the drum 3. Foam near the peripheral wall of the drum 3 is collected near the surface of the washing water near the defoaming device 70 by the rotation of the drum 3. Alternatively, it is transferred near the defoaming device 70. Inside the outer tank 2, the unevenness of the foam is reduced and the foam is more likely to come into direct contact with the defoaming device 70, making it possible to perform an efficient defoaming process.

The direction of rotation of the drum 3 during the defoaming process is preferably optimized according to the arrangement of the defoaming device 70. For example, as shown in FIG. 11, when the defoaming device 70 is placed at the bottom right of the outer tank 2, the rotation of the drum 3 is counterclockwise, and when the defoaming device 70 is placed at the bottom left of the outer tank 2, the drum 3 is rotated counterclockwise. , it is preferable that the drum 3 rotates clockwise. When the drum 3 is rotated with the defoaming device 70 disposed on either the left or right side of the outer tank 2, the foam collected near the water surface on the opposite left and right side where the defoaming device 70 is not located is removed. Defoaming is difficult. However, during the defoaming process, by optimizing the rotational direction of the drum 3 in accordance with the arrangement of the defoaming device 70, the foam can be efficiently transferred to the vicinity of the defoaming device 70. Inside the outer tank 2, the unevenness of the foam is further reduced and the foam is more likely to come into direct contact with the defoaming device 70, so that an efficient defoaming process is possible.

Subsequently, during the defoaming process, it is determined whether a condition for stopping the defoaming device 70 has been reached (step S45). As the stop condition, it can be determined whether the amount of bubbles generated inside the outer tank 2 is less than a predetermined eighth threshold value or whether the implementation time of the defoaming process has reached a predetermined time. The seventh threshold and the eighth threshold may be different from each other or may be the same.

As a result of the determination, if the condition for stopping the defoaming device 70 has not been reached (step S45; No), the process returns to step S44. When the amount of foam generated inside the outer tank 2 exceeds the eighth threshold, or when the defoaming process has not reached the predetermined time, excessive foam remains inside the outer tank 2. Therefore, the defoaming device 70 continues to break the foam.

On the other hand, as a result of the determination, if the condition for stopping the defoaming device 70 has been reached (step S45; YES), the defoaming device 70 is stopped (step S46). When the amount of foam generated inside the outer tank 2 is less than the eighth threshold value or when the time for performing the defoaming process has reached a predetermined time, the defoaming device 70 ends the defoaming.

Subsequently, the washing water stored in the outer tub 2 is drained (step S47). Next, the laundry is intermediately dehydrated by rotating the drum 3 (step S48). Next, the supplied water is introduced into the outer tub 2 to rinse the laundry, and the drum 3 is rotated to finally dewater the laundry (step S49). Thereafter, the operation of the washing process is ended.

When such a washing process is performed, excess foam generated in the outer tub 2 during laundry washing can be forcibly defoamed by the defoaming device 70. The foam film is destroyed by the mechanical force of the defoaming device 70, and the apparent volume of the foam rapidly decreases. Since the defoaming process is performed before the draining process, the foam accumulated on the surface of the washing water can be quickly defoamed without causing the washing water to foam due to the mechanical force of the defoaming device 70. By controlling the defoaming device 70 and the foam generating means, the cleaning process can be performed while maintaining an appropriate amount of foam and actively utilizing the friction reducing effect and oil adsorption effect of the foam.

In addition, in FIG. 16, in step S44, control is executed to rotate the drum 3 during the defoaming process, but step S44 may be omitted depending on the arrangement of the defoaming device 70, etc. . As the seventh threshold value and the eighth threshold value, an appropriate index corresponding to the amount of bubbles, the height of bubbles, the resistivity of bubbles, etc. can be used. Further, in the washing process shown in FIG. 16, the foam generation means does not necessarily need to generate foam.

FIG. 17 is a flowchart showing an example of operation of the washing machine according to the second embodiment.
As shown in FIG. 17, the defoaming device 70 can also be operated together with the blower 41 in the washing process of washing the laundry in the drum 3, before the draining process. In this operation example, it is preferable that the defoaming device 70 is disposed inside the ventilation duct 27, which is outside the outer tank 2.

First, water is supplied to the washing machine 200, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S50). Subsequently, in the same manner as in FIG. 16, the washing process is started, and the laundry is washed (step S51) and the amount of foam is detected (step S52). Then, the defoaming process is started, and the defoaming device 70 is operated (step S53) based on the detection result of the amount of foam.

Subsequently, during the defoaming process, control is executed to operate the blower 41 (step S54). When the blower 41 is operated, air circulates with respect to the outer tank 2, and an airflow is generated from the outer tank 2 through the blower duct 27 and back to the blower 41. In step S54, the blower 41 is operated, but the dry air heater 42 does not need to be operated.

When the blower 41 is operated during the defoaming process, the bubbles inside the outer tank 2 and the bubbles inside the blower duct 27 can be moved along with the circulating air. The bubbles that have entered the inside of the blower duct 27 are transferred to the upper side of the blower duct 27 near the defoaming device 70 by the airflow formed by the blower 41. In the inside of the outer tank 2 and the inside of the blower duct 27, the unevenness of the bubbles is reduced, and the bubbles are more likely to come into direct contact with the defoaming device 70, so that efficient defoaming is possible. Further, the evaporation of water contained in the bubbles is influenced by the wind speed around the bubbles, etc. The blown air efficiently evaporates the moisture contained in the foam, making it possible to extinguish the foam more quickly.

Subsequently, during the defoaming process, it is determined whether a condition for stopping the defoaming device 70 has been reached (step S55). As in FIG. 16, the stop conditions include whether the amount of bubbles generated inside the outer tank 2 is less than the eighth predetermined threshold, and whether the time required to perform the defoaming process has reached the predetermined time. It can be determined whether or not.

As a result of the determination, if the condition for stopping the defoaming device 70 has not been reached (step S55; No), the process returns to step S54. When the amount of foam generated inside the outer tank 2 exceeds the eighth threshold, or when the defoaming process has not reached the predetermined time, excessive foam remains inside the outer tank 2. Therefore, the defoaming device 70 continues to break the bubbles and the blower 41 continues to blow air.

On the other hand, as a result of the determination, when the condition for stopping the defoaming device 70 is reached (step S55; YES), the defoaming device 70 and the blower 41 are stopped (step S56). When the amount of foam generated inside the outer tank 2 is less than the eighth threshold value or when the time for performing the defoaming process has reached a predetermined time, the defoaming device 70 breaks the foam and the blower 41 blows air. end.

Subsequently, as in FIG. 16, draining of the washing water (step S57), intermediate dehydration (step S58), rinsing of the laundry, and final dehydration (step S59) are performed. Thereafter, the operation of the washing process is ended.

When such a washing process is performed, the excess foam generated in the outer tub 2 during washing of the laundry can be forcibly defoamed by the defoaming device 70 while being transferred by the air blowing by the blower 41. Since the wind speed around the foam can be increased, the evaporation of water contained in the foam can be promoted, and the defoaming speed can be increased. Moreover, since the bubbles can be entrained in the airflow, it is possible to suppress the bubbles from remaining inside the outer tank 2 or from staying inside the ventilation duct 27. Since the foam can be transferred to the vicinity of the defoaming device 70 and quickly broken, the time required for the defoaming process can be shortened.

Note that in FIG. 17, the blower 41 is operated after the defoaming device 70 is activated, but the order in which the defoaming device 70 and the blower 41 are activated is not particularly limited. The blower 41 may be activated first, or may be activated at the same time. Further, the order in which the defoaming device 70 and the blower 41 are stopped is not particularly limited. The blower 41 may be stopped first, or the defoaming device 70 may be stopped first.

FIG. 18 is a flowchart showing an example of operation of the washing machine according to the second embodiment.
As shown in FIG. 18, the defoaming device 70 can also be operated together with the blower 41 and the drying air heater 42 before the draining step in the washing step of washing the laundry in the drum 3. In this operation example, it is preferable that the defoaming device 70 is disposed inside the ventilation duct 27, which is outside the outer tank 2.

First, water is supplied to the washing machine 200, and water that has passed through the detergent container is introduced into the outer tub 2 and stirred by the drum 3 (step S60). Subsequently, as in FIG. 16, the washing process is started, and the laundry is washed (step S61) and the amount of bubbles is detected (step S62). Then, the defoaming process is started, and the defoaming device 70 is operated (step S63) based on the detection result of the amount of foam.

Subsequently, during the defoaming process, control is executed to operate the blower 41 and the dry air heater 42 (step S64). When the blower 41 is operated, air circulates with respect to the outer tank 2, and an airflow is generated from the outer tank 2 through the blower duct 27 and back to the blower 41. When the drying air heater 42 is operated, the air sent to the outer tank 2 is heated, dried, and raised in temperature.

When the blower 41 is operated during the defoaming process, the bubbles inside the outer tank 2 and the bubbles inside the blower duct 27 can be moved along with the circulating air. Further, by operating the drying air heater 42 during the defoaming process, the air that comes into contact with the foam can be brought into a higher temperature state with lower humidity. The evaporation of water contained in bubbles is influenced by the temperature difference between the bubble and the surrounding air, the absolute humidity difference, the wind speed of the surrounding air, etc. Dry, hot air efficiently evaporates the moisture contained in the foam, allowing for faster defoaming.

Subsequently, during the defoaming process, it is determined whether a condition for stopping the defoaming device 70 has been reached (step S65). As in FIG. 16, the stop conditions include whether the amount of bubbles generated inside the outer tank 2 is less than the eighth predetermined threshold, and whether the time required to perform the defoaming process has reached the predetermined time. It can be determined whether or not.

As a result of the determination, if the condition for stopping the defoaming device 70 has not been reached (step S65; No), the process returns to step S64. When the amount of foam generated inside the outer tank 2 exceeds the eighth threshold, or when the defoaming process has not reached the predetermined time, excessive foam remains inside the outer tank 2. Therefore, the defoaming device 70 continues to break the bubbles, the blower 41 continues to blow air, and the dry air heater 42 continues to perform heating.

On the other hand, as a result of the determination, when the condition for stopping the defoaming device 70 is reached (step S65; YES), the defoaming device 70, the blower 41, and the dry air heater 42 are stopped (step S66). When the amount of foam generated inside the outer tank 2 is less than the eighth threshold value or when the time for performing the defoaming process has reached a predetermined time, the defoaming device 70 breaks the foam and the blower 41 blows air. Then, heating by the drying air heater 42 is completed.

When such a washing process is performed, the excess foam generated in the outer tub 2 during washing of the laundry can be forcibly defoamed by the defoaming device 70 while being transferred by the air blowing by the blower 41. The blown air can be dried and heated by the drying air heater 42. Since the temperature difference, absolute humidity difference, and wind speed around the foam can be increased, the evaporation of water contained in the foam can be accelerated and the defoaming speed can be increased. Furthermore, since the bubbles can be entrained in the dry, high-temperature airflow, it is possible to prevent the bubbles from remaining inside the outer tank 2 or from staying inside the ventilation duct 27. Since the foam can be transferred to the vicinity of the defoaming device 70 and quickly broken, the time required for the defoaming process can be shortened.

In addition, in FIG. 18, the blower 41 and the dry air heater 42 are operated after the defoaming device 70 is activated, but the order of operation of the defoaming device 70, the blower 41, and the dry air heater 42 is as follows. It is not particularly limited. The air blower 41 may be activated first, the air blower 41 may be activated first, the drying air heater 42 may be activated first, or may be activated at the same time. Further, the order in which the defoaming device 70, the blower 41, and the dry air heater 42 are stopped is not particularly limited. The blower 41 may be stopped first, the defoaming device 70 may be stopped first, or the drying air heater 42 may be stopped first.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and includes various modifications without departing from the technical scope. For example, the embodiments described above are not necessarily limited to having all the configurations described. Furthermore, it is possible to replace a part of the configuration of a certain embodiment with another configuration, or to add another configuration to the configuration of a certain embodiment. Furthermore, it is also possible to add other configurations, delete configurations, and replace configurations of some of the configurations of a certain embodiment.

For example, the above-mentioned washing machines 100 and 200 are drum-type washer/dryers, but washing machines equipped with a heating means and a defoaming device for defoaming foam are vertical type washing machines, vertical type washer-dryers, etc. It can also be applied to dryers and the like. In a drum-type washer/dryer, the drum may be oriented horizontally without being inclined. A washing machine equipped with a heating means or a defoaming device for defoaming foam may or may not be equipped with a water overflow route. When the defoaming device 70 is disposed in the ventilation path, it may be disposed not only inside the ventilation duct 27 but also in other members such as a bellows pipe connected to the ventilation duct 27.

100,200 Washing machine 1 Box 2 Outer tank 3 Drum (inner tank)
4 Motor 5 Suspension 6 Operation panel 7 Detergent input section 8 Drying filter 9 Door 20 Internal drainage piping 21 Circulation pump 22 Circulation piping 23 Drain valve 24 External drainage piping 25 Overflow piping 27 Air duct 28 Intake duct 29 Blowout piping 30 Blowout nozzle 31 Lint Filter 32 Filter case 33 Connection joint 40 Air blower unit 41 Air blower 42 Dry air heater (air heating means)
50 Defoaming heater (heating means)
51 Heat generating part 52 Heat transfer plate 53 Fin 54 Foam generation unit (foam generation means)
55 Foam sensor (foam detection means)
61 Control board 70 Defoaming device 71 Defoaming section 72 Drive section 73 Drive shaft

Claims (23)

1. A box forming an outer shell;
   an outer tank provided within the box body;
   an inner tank rotatably supported within the outer tank;
   a motor that drives the rotation of the inner tank;
   a foam generating means for generating foam from detergent water;
   A washing machine comprising: heating means disposed in the outer tub for defoaming foam.
2. The washing machine according to claim 1,
   In the washing machine, the heating means is arranged above a predetermined water level that reaches the outer tub during the washing process.
3. The washing machine according to claim 1,
   In the washing machine, the heating means is arranged above an overflow water level that reaches a maximum water level when the outer tub overflows.
4. The washing machine according to claim 1,
   The heating means is arranged below near a preset specified water level that the outer tub reaches during the washing process,
   A washing machine that operates the heating means after it is detected that the water level in the outer tub has become lower than that of the heating means.
5. A washing machine according to any one of claims 1 to 4,
   A washing machine equipped with a circulation pump that circulates detergent water or water to the outer tub.
6. A washing machine according to any one of claims 1 to 5,
   a bubble detection means for detecting bubbles generated in the outer tank;
   A washing machine comprising: control means for controlling operation and stop of the heating means according to a detection result by the bubble detection means.
7. A washing machine according to any one of claims 1 to 6,
   A washing machine in which the heating means is a PTC heater.
8. The washing machine according to claim 7,
   A washing machine in which the heating means is waterproof and can be submerged in water.
9. A washing machine according to any one of claims 1 to 8,
   A washing machine in which a plurality of the heating means are arranged in the outer tub.
10. A washing machine according to any one of claims 1 to 8,
    The heating means includes a heat exchanger plate for heating the foam,
    In the washing machine, the heat transfer plate is provided with a heat transfer area larger than that of the heating means.
11. The washing machine according to claim 6,
    A washing machine that rotates the inner tub during a defoaming process using the heating means.
12. A washing machine according to any one of claims 1 to 5,
    A washing machine comprising a control means for controlling activation and stop of the heating means according to power consumption of the heating means.
13. A box forming an outer shell;
    an outer tank provided within the box body;
    an inner tank rotatably supported within the outer tank;
    a motor that drives the rotation of the inner tank;
    a foam generating means for generating foam from detergent water;
    A washing machine comprising: a defoaming device that defoams the foam generated in the outer tub using mechanical force.
14. The washing machine according to claim 13,
    A washing machine in which the defoaming device generates the mechanical force by the rotational movement.
15. The washing machine according to claim 13 or 14,
    In the washing machine, the defoaming device is disposed above a predetermined water level that reaches the outer tub during the washing process.
16. The washing machine according to claim 13 or 14,
    a blower that circulates air to the outer tank;
    a ventilation path for returning the air from the outer tank to the blower;
    In the washing machine, the defoaming device is disposed within the air blowing path.
17. The washing machine according to claim 16,
    A washing machine in which the defoaming device is provided in an air-permeable structure through which the blown air can flow.
18. The washing machine according to claim 16 or 17,
    A washing machine that operates the blower during a defoaming process by the defoaming device.
19. The washing machine according to claim 16 or 17,
    comprising an air heating means for heating the air,
    A washing machine that operates the blower and the air heating means during the defoaming process by the defoaming device.
20. The washing machine according to claim 13 or 14,
    In the washing machine, the defoaming device is disposed within the outer tub.
21. The washing machine according to claim 20,
    The defoaming device is a waterproof centrifugal fan that can be submerged in water.
22. The washing machine according to claim 20,
    A washing machine that rotates the inner tub during a defoaming process by the defoaming device.
23. The washing machine according to any one of claims 13 to 22,
    a bubble detection means for detecting bubbles generated in the outer tank;
    A washing machine comprising: control means for controlling operation and stop of the defoaming device according to a detection result by the foam detection means.

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