JPH11276791A - Drainage of washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase drain flow rate and shorten draining time by using a single pump as a circulating pump in a washing process and using the pump as drain auxiliary force in a draining process. SOLUTION: A pump 11 having two discharge ports 80, 81 is used, an opening connection within a water tank 4 is performed for the one discharge port 80, the other discharge port 81 is connected with a drain valve 12, circulation in a washing process and a rinsing process are required, the pump 11 is operated in a state that the drain valve 12 is closed at the time of a process that drainage is not required and washing liquid is circulated within the water tank 4. At the time of processes that drainage is required such as dry spinning and draining processes, the pump 11 is operated in a state that the drain valve 12 is opened. As a result, drainage can be compulsorily performed at the time of the draining process.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum type washing machine.

[0002]

2. Description of the Related Art A large number of horizontal drum-type washing machines that rotate about a horizontal axis have been proposed in the past. Most of the washing machines used in Europe are of this type. It is. In general, a washing machine of this type performs a washing operation by continuously rotating a rotating drum at a low speed. By using this rotating drum, dehydration and drying can be easily performed.

A conventional drum type washing machine having a circulation pump is disclosed in Japanese Patent Application Laid-Open Nos. 9-173689 and 9-215.
No. 893, the outline of which is shown in FIG.
A description will be given with reference to a schematic longitudinal sectional front view shown in FIG. 6 and a schematic longitudinal sectional side view shown in FIG.

The drum type washing machine shown in FIGS. 5 and 6 has a water tub 4 suspended by an anti-vibration mechanism 28 at the upper inside of the washing machine main body 1 and a horizontal axis OO inside the water tub 4. Has a double structure with the drum 2 arranged so as to rotate. Reference numeral 21 in FIG. 6 denotes an operation / display portion, on the back side of which a control device 22 is attached. Aquarium 4
It has a function of storing and discharging a washing liquid and a dehydrating liquid. Further, it has an exhaust port for connecting an exhaust duct 19 for guiding hot air during drying to the heat exchanger 8. The drum 2 supplies water to the entire peripheral wall during washing, drainage during dehydration,
In addition, a number of small holes are provided for passing hot air during drying. Above the water tank 4, a drying unit 14 including a blower fan 20 for circulating air in the water tank 4, a heater 29, and a heater duct 30 that houses the heater 29 and serves as an air circulation path is provided.

A door 24 for taking in and out the laundry is provided at the front of the main body 1 of the washing machine, and the door 24 is sealed by a door packing 26 between the washing machine 4 and the water tub 4. Reference numeral 17 denotes a drive motor for rotating the drum 2, and reference numeral 12 denotes a drain valve for discharging washing liquid and the like out of the washing machine. Reference numeral 27 denotes a lint filter provided in a piping path between the water tank 4 and the drain valve 12. During the drying step, the air is heated by the heater 29 and sent into the drum 2 by the blower fan 20 to remove the moisture of the laundry. Next, from there, the moisture passes through the exhaust duct 19 from the exhaust port of the water tank 4 and is condensed by heat exchange when the heat exchanger 8 located on the side of the water tank 4 comes into contact with cold water. The cooled dry air is sent to the blower fan 20 again, reheated by the heater 29, and recirculated to the drum 2.

In the above configuration, during the washing and rinsing steps, the circulating pump 11 is operated to drain the washing liquid in the water tub 4 into the drain duct 9, the filter case 10, and the filter 2.
7. Circulate into the water tank 4 via the circulation pump 11 and the circulation pipe 111. Circulation pump 1 for drainage during dehydration and drainage processes
1 is stopped and the drain valve 12 is opened, so that the detergent liquid in the water tank 4 is drained by the drain duct 9, the drain valve 12, and the drain path 1.
3. Natural release from the washing machine to the outside. In addition, there is a drum type washing machine provided with a pump dedicated to drainage separately from the circulation pump 11 in order to drain the water to a high place, and forcibly draining the water to a high place using the pump dedicated to drainage.

Further, as shown in FIG. 7, a washing and dewatering tub 2 having a pulsator 90 for opening the upper part and agitating the laundry at the central bottom part, and a water tub 4 for receiving water around the washing and dewatering tub 2; The motor 17 and the drain valve 12
The washing machine main body 1 is provided with the water tank 4 using an elastic body 92.
In a fully automatic washing machine locked in the
As described in the publication, a water supply switching means 91 is provided, and a circulation pipe 111 and a drain valve 12 for circulating water in the water tank 4 to the washing and dewatering tank 2 by one pump 11 are provided.
The switching is performed by the switching means 91 in a timely manner.

[0008]

However, in the conventional drum type washing machine, in the case of a natural drainage type, a long time is required for drainage, and the output of one pump is switched by a switching valve. In the apparatus that switches between the circulation to the water tank and the drainage, the switching means has a disadvantage that lint and detergent accumulate, and the cost is high.

[0009]

A first aspect of the present invention is a washing tub and dewatering drum, a water tub containing the drum, a drain means for draining water in the water tub, and a pump connected to the water tub. A circulation path for returning and circulating the water in the water tank to the water tank during washing or rinsing, and control means for automatically operating the washing, rinsing, and dehydrating steps, and driving the pump during the washing and rinsing operation. In the drainage device of the washing machine that performs the drainage by driving the pump at the time of drainage operation, the discharge side of the pump is branched, and one of the two is passed through the circulation path. In addition to being connected to the water tank, the other is connected to a drainage path via a drainage valve.

According to a second aspect of the present invention, in the first aspect of the present invention, there is provided a pump having two discharge ports, which selectively discharges according to the rotation direction of the impeller. And a drainage path connecting the other outlet to a drain valve and having control means for selectively executing discharge to two outlets. Things.

According to a third aspect of the present invention, in the first aspect of the present invention, a discharge port communicating with a drain valve of a pump casing in which the pump is disposed is disposed below the lowermost surface of the pump casing. It is characterized by being located higher than the drain valve.

According to a fourth aspect of the present invention, in the first aspect of the present invention, a water level detecting means is provided, and in a drainage process such as dehydration or drainage, the water level in the water tank reaches a predetermined level after the start of drainage. It has a control means for detecting the water level detecting means and starting the operation of the pump.

According to a fifth aspect of the present invention, in the first aspect of the present invention, in a drainage process such as dehydration or drainage, control for starting operation of the pump is performed after a lapse of a predetermined time from the start of drainage. It is.

According to a sixth aspect of the present invention, in the first aspect of the present invention, there is provided a water level change presence / absence detecting means for detecting the presence / absence of a water level change in the water tank based on the start of pump operation at the time of drainage. And a control means for stopping the pump.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, taking a drum type washing machine as an example. The basic structure of the drum type washing machine in this embodiment is substantially similar to the conventional drum type washing machine as shown in FIGS. In the following, description will be made focusing on main parts and parts related to the invention.

FIG. 1 is a schematic vertical sectional side view showing the internal structure of a drum type washing machine according to the present invention. Hereinafter, the structure of the drum type washing machine according to the present invention will be described with reference to FIG. 1 and FIG. I do. 1 and 5, reference numeral 1 denotes a washing machine main body;
Is a rotary drum, 3 is a stirring baffle, 4 is a water tank, 5 is a water supply hose, 6 is a water supply valve for washing, 7 is a water supply valve for drying, 8 is a cooling duct, 9 is a drain duct, 10 is a filter case, 1
1 is a circulation pump, 12 is a drain valve, 13 is a drain hose, 1
4 is a drying unit, 15 is a rotating shaft, 16 is a drum pulley, 17 is a motor, 18 is a belt, 19 is an exhaust duct,
20 is a blower fan, 21 is an operation panel, 22 is a control device, 23 is a water supply port, 24 is a door, 25 is a water level sensor,
26 is a door packing, 27 is a filter, 28 is an anti-vibration mechanism, 29 is a drying heater, 30 is a ventilation duct, and 61 is a water supply pipe.

A rotating drum 2 and a water tub 4 each having a substantially cylindrical shape are provided in the main body 1 of the washing machine, and a rotating shaft 15 is disposed on the rotating drum 2 along a substantially horizontal direction. Rotary axis 1
A door 24 is provided at one end in the direction along 5 (an end opposite to the rotating shaft 15), and the door 24 is opened to allow laundry to be loaded. Reference numeral 26 denotes a door packing, which is internally fitted as a sealing material made of an elastic material such as rubber. Therefore, when the door 24 is closed, the sealing material is sandwiched between the peripheral edge of the door 24 and the inner peripheral edge of the charging port, so that the watertightness of the washing machine main body 1 and the water tub 4 is maintained. . In order to absorb vibrations, the water tank 4 is attached to the washing machine body 1.
Is elastically supported by an anti-vibration mechanism 28 from above, thereby damping the vibration of the water tank 4.

The rotary drum 2 accommodates and rotates laundry, and has a stirring baffle 3 formed in the rotary drum 2 in a mountain-like shape protruding toward the central axis. Aquarium 4
Is provided so as to surround the rotary drum 2 and accumulates washing water (including detergent-containing water and rinsing water). The washing water passes through the high-pressure hose 5 connected to the tap water, and controls the opening and closing of the washing water supply valve 6 to supply water to the detergent case 62 from the water supply port 23, mixes with the detergent in the detergent case 62, and supplies the water to the water supply pipe 61. Through the drain duct 9 through the filter case 10 provided below the lowermost surface of the water tank 4,
It is supplied into the water tank 4. Also, inside the water supply valve 7,
It also has a switching mechanism for sending tap water into the cooling duct 8 so that the cooling water for drying and dehumidification can be showered in the cooling duct 8.

At the bottom of the water tub 4, a drain duct 9 for discharging the washing water in the water tub 4 is provided. This drain duct 9 removes lint and dirt contained in the drained washing water. The filter 27 removes lint, dust, and the like. The filter case 10
A circulating pump 11 for circulating the washing water into the water tank 4 and the water tank 4
Drain duct 9 for draining washing water inside the washing machine
And a water supply pipe 61 connected to the water supply port 23 is connected.

When the washing water accumulated in the water tub 4 is circulated, the washing water in the water tub 4 passes from the drain duct 9 through the filter 27 in the filter case 10 and after the contaminants are removed, the circulation pump 11 As a result, the water is returned into the water tub 4 through the circulation pipe 111 that opens in the door packing 26 near the laundry inlet of the water tub 4. When draining the washing water in the tub 4, the washing water is drained from the washing machine body 1 through a drain hose 13 from a drain valve 12 branched from the filter case 10.

In the main body 1 of the washing machine, a drying unit 14 for drying the laundry and a cooling duct 8 are provided. The cooling duct 8 is a duct having one end and the other end communicating with the upper end and the lower end of the water tank 4, and water for drying and dehumidification is supplied from the water supply valve 7 for drying via a water pipe. Is to enter. The drying unit 14 is provided in the middle of the air flow path of the cooling duct 8 and includes a heater 29 and a fan 20. The drying unit 14 blows warm air into the water tank 4 via the cooling duct 8. .
That is, the evaporated water from the laundry is dehumidified by the tap water in the cooling duct 8 and again passes through the drying unit 14 to dry the laundry with the dried hot air.

A horizontal rotary shaft 15 is fixedly provided at the end of the drum 2 which is the center of rotation of the drum 2 and which is opposite to the input port (side of the door 24) through the center of the water tank 4. 1
A drum pulley 16 is fixed to 5. A drum driving motor 17 is provided at the lower end of the water tank 4. A rotating shaft of the motor 17 and the drum pulley 16 are connected to a belt 18.
Are connected by The water tub 4, the rotating shaft 15, the drum pulley 16, the drum driving motor 17, and the like are housed in the main body 1 of the washing machine.

In order to absorb vibrations, the water tub 4 is suspended from the upper part of the washing machine main body 1 by a spring 28 having an anti-vibration function and from the lower part by a shock absorber, whereby the vibration of the water tub 4 is damped. It is made to let. A plurality of installation legs are provided on the bottom surface of the main body 1 of the washing machine, and the main body 1 is supported by these installation legs.

(Embodiment 1) The operation of each embodiment of the present invention will be described below. In each embodiment, the operations from basic washing to drying are almost the same as those of a conventional drum type washing machine. . FIG. 2 is a schematic side view of the pump 11 (FIG. 2).
(A)) and the front view (FIG. 2 (B)), the invention of the first embodiment has two discharge ports 80 and 81 as shown in FIGS.
Is provided, and one discharge port 80 is connected to the water tank 4.
Opening connection inside, connecting the other outlet 81 to the drain valve 12, requires circulation such as washing process and rinsing process,
In a process that does not require drainage, the pump 11 is operated with the drain valve 12 closed to circulate the washing liquid into the water tub 4,
On the other hand, during a process requiring drainage such as a dehydration or drainage process, the pump 11 is operated with the drain valve 12 opened,
Thereby, it is possible to forcibly drain the water in the drainage process. In addition, one discharge port may be provided in the pump 11 and branched into two discharge ports.

More specifically, referring to FIGS. 1 and 2, the washing process is as follows.
When the detergent is put into the detergent case 62 in 3 and the start key is pressed, the operation is started. The door 24 is locked, the laundry water supply valve 6 is opened, and water is supplied from the water supply port 23 into the detergent case 62. Detergent is caused to flow by the water supply, passes through the water supply pipe 61, the filter case 10, and the drain duct 9, and water accumulates from below the water tank 4. Further, since the circulation pump 11 is connected to the filter case 10, the detergent and water that have passed through the water supply pipe 61 also flow into the circulation pump 11. When the circulation pump 11 is operated, the detergent and the water that have flowed in are vigorously stirred, and the detergent is dissolved in the water. The detergent liquid in which the detergent has been sufficiently dissolved is applied from one outlet 80 of the circulation pump 11 to the laundry in the water tub 4 from above by a circulation pipe 111 which is opened near the door packing 26 near the inlet of the water tub 4. .

The washing water in the water tub 4 passes from the drainage duct 9 through the filter 27 in the filter case 10 to remove contaminants, and is then sent back to the circulation pump 11 and discharged from the discharge port 80 leading to the water tub 4 through the water outlet 4. Returned within. On the other hand, the washing water discharged from the discharge port 81 is closed by the drain valve 12 and is not drained. When draining the washing water in the water tub 4, the drain valve 12 is operated, and the valve 12 is operated.
Is opened, the washing water is drained from the washing machine main body 1 through the drain hose 13. At this time, by operating the circulation pump 11 at the same time, more washing water is discharged from the discharge port 81 connected to the drainage path to discharge more washing water, and the time required for drainage can be reduced.

(Embodiment 2) FIG. 3 is a schematic side view (FIG. 3 (A)) and a front view (FIG. 3 (B)) of a pump used in Embodiment 2, and FIG. 1, as shown in FIG. 3, a pump 11 having two discharge ports 82 and 83 and selectively discharging according to the rotation direction is adopted, and one discharge port 82 is connected to the water tank 4 by opening. The other discharge port 83 is connected to the drain valve 12, and the discharge port that is connected to the water tank 4 with the drain valve 12 closed in a process that requires circulation such as a washing step and a rinsing step and does not require drainage. The pump is rotated in a direction for efficiently discharging the washing liquid to, for example, the clockwise direction to efficiently circulate the washing liquid into the water tub 4. Open the pump 11 in the opposite direction, for example, The drainage is rotated in a direction so efficiently discharged from the discharge port, in which it is forcibly drained and to be able to.

More specifically, referring to FIG. 1 and FIG. 3, a pump 11 which is controlled to be rotatable left and right and two discharge ports 82 and 83 are arranged in the pump 11, and one discharge port 82 is connected to the water tank by opening. Then, one discharge port 83 is connected to the drain valve 12, and the electric control is performed so that the rotation direction of the pump 11 is changed between when circulating into the water tank 4 and when draining. For example, a pump 11 in which two discharge ports 82 and 83 are arranged at the positions shown in FIG. 3 is employed, and when the pump 11 is rotated in the direction of the arrow, the discharge flow rate of the discharge port 82 becomes larger than that of the discharge port 83, and the discharge port 82 rotates in the opposite direction. At this time, the discharge flow rate of the discharge port 83 becomes larger than that of the discharge port 82. In a process that requires circulation such as a washing process and a rinsing process, and does not require discharge, the pump 11 is operated in the direction of the arrow with the drain valve 12 closed so that the discharge port 82 can be discharged.
, The washing liquid can be efficiently circulated into the water tub 4. On the other hand, during a process that requires drainage such as a dehydration or drainage process, the pump 11 can be forcibly and efficiently drained by rotating the pump 11 in the opposite direction with the drain valve 12 opened.

(Embodiment 3) FIG. 4 is a schematic side view (FIG. 4 (A)) and a front view (FIG. 4 (B)) of a pump used in Embodiment 3, and the invention of Embodiment 3 is as follows. 1 and 4
As shown in the figure, the pump 11 having two discharge ports 84 and 85 is arranged, one discharge port 84 is opened and connected into the water tank 4, one discharge port 85 is connected to the drain valve 12, and the washing process is performed. In a process that does not require drainage, such as a rinsing process, the pump is operated with the drain valve 12 closed to circulate the washing liquid in the water tub 4 while drainage is not required. In the drum type washing machine that forcibly drains water in addition to natural drainage by operating the pump with the drain valve 12 open, the discharge port 85 communicating with the drain valve 12 of the pump 11 is pumped. And the discharge port 85 is positioned higher than the drain valve 12 so that after the operation of the washing machine is stopped, water can flow out into the pump 11 without remaining water. is there.

Referring to FIG. 4 in more detail, a discharge port 85 communicating with the drain valve 12 is arranged on the lowermost surface of the pump 11 and is positioned higher than the drain valve 12. Thus, at the end of the drain valve process, that is, after the operation of the pump 11, the pump 1
The water in 1 can naturally flow out from the discharge port 85 to the drain valve 12.

(Embodiment 4) Next, Embodiment 4 will be described. In the invention of Embodiment 4, a water level detecting means is provided in the washing machine main body 1, and a water level in the water tub 4 due to drainage is provided in a drainage step. Due to the decrease, the water level in the water tank where the pump 11 cannot discharge the circulating water into the water tank is set, the pump 11 is not operated until the water level is detected, and the sewage in the water tank 4 after the washing and rinsing step is removed. Through the aquarium 4
The laundry is circulated inside the washing machine so as not to bathe the laundry with sewage, and after the sewage reaches a water level at which the sewage does not circulate in the water tank, the pump 11 is operated to drain the laundry.

More specifically, referring to FIG. 1, a water level detecting device (not shown) and a pump 11 are provided, and the pump 11 is capable of discharging the pump 11 from the outlet of the circulation pipe 111 by limiting the pumping capacity of the pump 11. The amount of drop between the water level in the water tank 4 and the outlet of the circulation pipe 111 is experimentally determined. For example, the water tank when the water level in the water tank 4 is lowered due to drainage and the water in the water tank 4 cannot be discharged from the outlet of the circulation pipe 111 The water level in 4 is determined as a predetermined water level, and at the time of drainage, natural drainage is performed until the water level is reached, and the pump 11 is operated after the water level detection device detects this water level. At this point pump 1
Even if 1 is operated, the sewage in the water tub 4 cannot be discharged into the water tub 4, so that the sewage does not circulate and contaminate the laundry with the sewage.

Fifth Embodiment Next, a fifth embodiment will be described. In the fifth embodiment, the pump 11 cannot discharge the circulating water into the water tank due to a decrease in the water level in the water tank 4 due to the drainage in the drainage process. The water level is set, the circulation pump is not operated until this time, and the sewage in the water tub 4 after the washing and rinsing step is circulated into the water tub 4 via the pump 11 to wash the laundry with the sewage. It is not allowed to be bathed.

More specifically, the time until the pumping capacity of the pump 11 reaches the limit in the fourth embodiment is experimentally determined, and at the time of drainage, natural drainage is performed until this time elapses. After that, the pump 11 is operated. At this time, even if the pump 11 is operated, the sewage in the water tub 4 cannot be discharged into the water tub 4, so that the sewage circulates and does not contaminate the laundry with the sewage.

(Embodiment 6) Next, Embodiment 6 will be described. In Embodiment 6, the water level detecting means is provided, and in the drainage process, after a predetermined time has elapsed from the start of operation of the pump 11, the water level in the water tank 4 is reduced. When the water level is detected and the water level does not reach the predetermined water level, the pump 11 is stopped, and the phenomenon that the water level does not reach the predetermined water level or lower within a predetermined time after the pump 11 starts operating during drainage is abnormal in the drainage path. The pump 11 recognizes that there is an abnormality and prevents the pump 11 from running wastefully when the drainage path is abnormal.

More specifically, the water level detecting device and the pump 11 are arranged, and the water tank 4 is discharged after a predetermined drainage time of the pump 11.
The water level in the pump is determined experimentally.
In the case of an experimental result in which the water level in the water tank 4 drops from H to h due to drainage after one operation b minutes, the water tank 4
The pump 11 is stopped when the water level of h is not reached. The fact that the water level does not reach h after starting the operation of the pump 11 for b minutes is due to a problem in the drainage path, and the drainage can be stopped before danger without continuing the drainage. Further, the operation time of the pump 11 until the water level reaches h in the water tank may be detected.

The detection of the presence or absence of a water level change in the present invention is performed by detecting whether or not the water level after a lapse of a predetermined time from the start of the operation of the pump is equal to or lower than the predetermined water level, or when the amount of water level change per time is equal to or higher than a predetermined value. It is conceivable to detect whether or not the time required to reach the predetermined water level is within a predetermined time, or whether the time required for changing the predetermined water level is within a predetermined time.

[0038]

According to the first aspect of the present invention, one discharge port of the circulation pump is connected to the inside of the water tank, and one discharge port is connected to the drainage path. In the drainage process, it acts as an auxiliary force for drainage, leading to an increase in the flow rate of drainage and a reduction in drainage time.

According to the second aspect of the present invention, the circulation pump is operated in one direction during the washing step because the pump is provided with a controllable rotation direction and the discharge port is provided for each rotation direction. As a result, the washing water can be efficiently circulated into the water tub, and at the time of drainage, the circulating pump can be operated in the reverse direction so that the washing water can be efficiently drained. It leads to cost reduction. In addition, if a circulating pump having an increased head in the rotating direction to the drainage step is used, drainage to a high place can be performed.

According to the third aspect of the present invention, since the lowermost surface of the casing is located higher than the drain passage, water remaining in the pump casing can be naturally discharged after the end of the operation of the circulating pump. Water can be prevented and freezing and decay can be prevented.

According to the fourth aspect of the present invention, in the drainage process, after the start of drainage, a water level sensor detects that a predetermined water level in the water tank has been reached, and then control for starting operation of the circulation pump is performed. Drainage can be performed without circulating wastewater into the water tank.

According to the fifth aspect of the present invention, in the drainage step, the drainage is performed without circulating the wastewater into the water tank by controlling the operation of the circulation pump after a predetermined time has elapsed after the start of the drainage. It is possible to increase drainage flow rate and shorten drainage time.

According to the sixth aspect of the invention, when an abnormality such as clogging occurs in the drainage path, the pumping is continued by the circulation pump, and occurrence of an abnormality such as overflow or failure can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional side view showing the internal structure of a drum type washing machine according to the present invention.

FIG. 2 is a front view and a side view of the circulation pump according to claim 1 of the present invention.

FIG. 3 is a front view and a side view of a circulating pump according to claim 2 of the present invention.

FIG. 4 is a front view and a side view of a circulation pump according to claim 3 of the present invention.

FIG. 5 is a schematic side sectional view of a conventional drum type washing machine.

FIG. 6 is a schematic plan sectional view of a conventional drum type washing machine.

FIG. 7 is a schematic sectional view of a conventional fully automatic washing machine.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Washing machine main body, 2 ... Drum, 3 ... Stirring baffle, 4 ...
Water tank, 5: water supply hose, 6: water supply valve for washing, 7: water supply valve for drying, 8 ... cooling duct (heat exchanger), 9 ... drain duct, 10 ... filter case, 11 ... circulation pump, 111
... Circulation pipe, 12 ... Drain valve, 13 ... Drain hose, 14
... drying unit, 15 ... rotating shaft, 16 ... drum pulley,
17 ... motor, 18 ... belt, 19 ... exhaust duct, 20
... Blower fan, 21 ... Operation panel, 22 ... Control device, 2
3 ... water inlet, 24 ... door, 25 ... water level sensor, 26 ...
Door packing, 27: filter, 28: anti-vibration mechanism, 29
... heater, 30 ... air duct, 61 ... water supply pipe, 62 ... detergent case, 80, 82, 84 ... discharge port of circulation pump (connected to water tank), 81, 83, 85 ... discharge port of circulation pump (drain passage Connected), 90 ... Pulsator, 91 ...
Switching means, 92 ... elastic body.

Claims (6)

[Claims] 1. A washing tub / dewatering drum, a water tank containing the drum, a drainage means for draining water in the water tank, a pump connected to the water tank, and water in the water tank at the time of washing or rinsing. A circulation path for returning to the water tank and circulating, and a control means for automatically operating the washing, rinsing, and dehydration steps, and during the washing and rinsing operation, the pump is driven to circulate water in the water tank, In a drainage device for a washing machine, which drives the pump to perform drainage during drainage operation, a discharge side of the pump is branched, and one is connected to a water tank via the circulation path, and the other is a drain valve. A drain device for a washing machine, wherein the drain device is connected to a drain path via a drain. 2. A pump having two discharge ports, which selectively discharges according to the rotation direction of the impeller. One of the discharge ports is opened and connected to the inside of the water tank through the circulation path, and the other discharge port is connected. 2. The drainage device for a washing machine according to claim 1, further comprising a drainage path having an outlet connected to a drainage valve, and control means for selectively executing discharge to two discharge ports. 3. A discharge port communicating with a drain valve of a pump casing in which the pump is disposed is disposed below the lowermost surface of the pump casing, and the discharge port is positioned higher than the drain valve. The drainage device for a washing machine according to claim 1, wherein 4. A water level detecting means, wherein in a drainage process such as dehydration or drainage, after the start of drainage, the water level detecting means detects that the water level in the water tank has reached a predetermined water level,
The drain device for a washing machine according to claim 1, further comprising control means for starting operation of the pump. 5. The drainage device for a washing machine according to claim 1, wherein in a drainage step such as dehydration or drainage, control is performed to start operation of the pump after a predetermined time has elapsed from the start of drainage. 6. A water level change detecting means for detecting a water level change in a water tank based on a start of operation of a pump at the time of drainage, and a control means for stopping the pump when detecting no water level change. The drainage device for a washing machine according to claim 1, wherein: