JPH10295981A - Washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a water level fluctuation even while the power supply of a machine body is cut off and prevent a water leakage and an overflow in a washing machine provided with a water level detecting means detecting the water level of a washing tub. SOLUTION: Electric power is fed to a control means 18 from a DC power supply 22 converting an AC power supply 21 into DC, a water level detecting means 23 is connected to the control means 18 to detect the water level of a washing tub washing the laundry, and a load power supply opening/closing means 20 is connected to a load 16 driven by the AC power supply 21 to open or close the AC power supply 21. The water level detecting means 23 detects the water level of the washing tub even when the load power supply opening/ closing means 20 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine having a water level detecting means for detecting a water level in a washing tub.

[0002]

2. Description of the Related Art Conventionally, this type of washing machine has been configured as shown in FIG. Hereinafter, the configuration will be described.

As shown in the figure, a water receiving tub 1 has a washing and dewatering tub (washing tub) 2 rotatably disposed inside, and a pulsator 3 at the bottom of the washing and dewatering tub 2 rotatably disposed. Has been established. The motor 4 drives the washing and dewatering tub 2 or the pulsator 3 via the clutch and speed reduction mechanism 5. Water supply valve 6
Supplies tap water from the water supply port 7 into the washing and dewatering tub 2. The drain valve 8 drains the washing liquid in the water receiving tub 1 via the drain hose 9 to the outside of the machine.

[0004] When performing a water injection rinse, the washing liquid is drained through a drain hose 9 while overflowing from an overflow port 10. The overflow port 10 is also used to prevent the washing liquid from overflowing from the water receiving tub 1 when the water level is rising due to some abnormality. Water level detecting means 11
Is an air trap 12 provided at a lower portion inside the water receiving tank 1.
The water level of the washing and dewatering tub 2 is detected by detecting the air pressure of the washing and dewatering tub 2. The control device 13 determines the water level based on the signal output from the water level detection means 11.

The water level detecting means 11 is turned on by turning on a power switch (not shown), and the water level detecting means 1 is turned on.
1 is energized.

[0006] The structure of a washing machine with a drainage pump will be described with reference to FIG. The drainage pump 14 pumps and drains the washing liquid in the washing and dewatering tub 2 to a place higher than the water surface in the washing and dewatering tub 2 via a drainage hose 15. Therefore, the overflow port 10 cannot be provided. Other configurations are the same as those of the washing machine without the drain pump.

[0007]

In such a conventional construction, when the power of the machine body is turned off and the washing liquid is accumulated in the washing and spin-drying tub 2, the washing due to poor adhesion of parts or the like occurs. Even if the liquid leaks, the water level detecting means 11 is not energized, and if the user does not notice the leak, there is a problem that the damage caused by the leak increases.

In a washing machine without a drain pump, when the water supply valve 6 fails and water supply cannot be stopped while the power of the machine is turned off, the water level detecting means 11 is not energized. If the user does not notice abnormally, there is a problem that water continues to flow from the overflow port 10 and wastes valuable water resources. In addition, when the drain hose 9 is leaned, there is a problem that water overflows from the washing and dewatering tub 2 and the body, the house and the like are drained.

A washing machine with a drainage pump is provided with an overflow port 1.
If 0 is not provided and the water supply valve 6 fails and water supply does not stop, there is a problem that the washing liquid overflows from the washing and dewatering tub 2.

The present invention solves the above-mentioned conventional problems. In the state where the power of the machine is turned off, the washing liquid leaks due to defective bonding of parts or the like, and the water supply valve fails to stop the water supply. The purpose is to prevent water from overflowing in such cases and to prevent damage from water, and not to waste valuable water resources.

[0011]

According to the present invention, in order to achieve the above object, a DC power supply for converting an AC power supply to a DC power is supplied to a control means for operation, and a water level detecting means is connected to the control means. Detects the water level of the washing tub for washing laundry,
A load power supply switching means is connected to a load driven by the AC power supply to open and close the AC power supply. The water level detection means detects the water level of the washing tub even when the load power supply switching means is in an open state.

With this configuration, when the washing machine leaks due to defective bonding of parts or the water supply valve fails to stop the water supply when the power supply of the machine is turned off, the water level detection means detects it. By controlling, water overflows,
It can prevent water damage and prevent wasting valuable water resources.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is a DC power supply for converting an AC power supply to a DC power, a control means operable by supplying power from the DC power supply, and a washing machine for washing laundry. A washing tub, a water level detection means connected to the control means for detecting a water level of the washing tub, a load driven by the AC power supply, and a load power supply opening / closing means connected to the load to open and close the AC power supply; The water level detection means is configured to detect the water level of the washing tub even when the load power supply opening / closing means is in an open state, and when the power supply of the load is turned off, that is, the power supply of the body is turned off. Even in the cut-off state, by detecting and controlling by the water level detecting means, it is possible to prevent water from overflowing and damage caused by water, and not to waste valuable water resources.

According to a second aspect of the present invention, in the first aspect of the present invention, the load power supply switching means is in an open state.
When the water level in the washing tub drops in a state where the washing liquid is accumulated in the washing tub, the control means determines that there is a water leakage abnormality in the washing tub. Even in the state described above, when the washing liquid leaks out due to poor adhesion of parts or the like, the control means determines that there is a water leakage abnormality and controls it, thereby preventing the damage caused by the leaked water from spreading.

According to a third aspect of the present invention, in the second aspect of the present invention, when the load power supply opening / closing means is in an open state,
And, in a state where the washing liquid is stored in the washing tub, when the water level of the washing tub is decreasing at a constant speed, the control means is configured to determine that there is a water leakage abnormality in the washing tub, When the user removes the laundry from the washing tub, the water level drops, but the rate at which the water level drops does not become constant.Therefore, determine that a water leak is abnormal only when water actually leaks. Can be.

According to a fourth aspect of the present invention, in the first aspect of the present invention, there is provided a water supply means for supplying water to the washing tub, and the water level of the washing tub rises when the load power supply opening / closing means is in an open state. Sometimes, the control means determines that the washing tub overflows.If the water supply valve fails and the water supply cannot be stopped while the power of the machine is turned off, the control means overflows. By judging and controlling as abnormal, precious water resources can be prevented from being wasted, and water can be prevented from overflowing from the washing tub even when the drain hose is leaning.

According to a fifth aspect of the present invention, in the first aspect of the present invention, the load power supply switching means is in an open state.
When the water level in the washing tub rises above a predetermined water level, the control means determines that the washing tub has overflowed.If the user supplies water with a bucket or the like, the control means does not determine that the overflow has occurred. Only when the water actually overflows, it can be determined that the water is abnormal.

[0018] The invention described in claim 6 is the above-mentioned claim 2-
5. The invention according to claim 5, further comprising abnormality notification means connected to the control means for notifying an abnormality, wherein the load power supply opening / closing means is in an open state and the control means determines a water leakage abnormality or an overflow water abnormality in the washing tub. An abnormality is notified by the abnormality notifying means, and even when the body is turned off, the user can be notified of the abnormality at the time of a water leakage abnormality or a flooding abnormality, thereby increasing the damage caused by water. Can be prevented.

The invention described in claim 7 is the above-mentioned claim 2
5. The invention according to 5, further comprising display means for performing a display operation, wherein the display means is turned off and the load power supply opening / closing means is in an open state, and the control means determines a water leakage abnormality or a water overflow abnormality in the washing tub. The display means is turned on, and the load power supply opening / closing means is held in an open state.
Since the abnormality can be notified to the user, runaway and electric shock due to defective parts can be suppressed, and safety can be improved.

[0020] The invention according to claim 8 provides the above-mentioned claim 1,
The invention according to claims 4 and 5, further comprising a drain pump connected to the load power switching means for forcibly draining the washing liquid in the washing tub, wherein the load power switching means is in the open state, and the control means is the washing tub. When it is determined that the overflow is abnormal, the load power supply opening / closing means is closed, and the drain pump is driven to forcibly drain the washing liquid in the washing tub. The washing machine pumps up the washing liquid to a level higher than the water level in the washing tub and drains it.Therefore, there is no overflow port.However, when the power of the machine is turned off, the water supply valve breaks down and water supply does not stop. Even in such a case, the water overflows from the washing tub, which can prevent the damage caused by the water from spreading.

According to a ninth aspect of the present invention, in accordance with the eighth aspect of the present invention, there is provided an abnormality notification means connected to the control means for notifying an abnormality, wherein the load power supply switching means is in an open state, and When it is determined that the washing tub is overflowing, the abnormality is notified by the abnormality notifying means, the load power supply opening / closing means is closed, and the drain pump is driven to forcibly drain the washing liquid in the washing tub. By notifying the user of the abnormality and forcibly draining the water with the drain pump, the user can be notified of the abnormality while preventing overflow from the washing tub.

[0022] The invention according to claim 10 is the invention according to claim 8.
In the invention described in the above, when the load power supply opening / closing means is in the open state, the control means determines that the washing tub overflows, and the water level is raised when the drainage pump is forcibly draining the washing liquid in the washing tub. When the water level falls below the specified level, the operation of the drainage pump is stopped.If the water supply valve fails and the water does not stop, and the amount of water supply is small, the amount of drainage is smaller than the amount of water supply. It is possible to prevent the drain pump from continuing to operate even after the washing tub has run out of water.

[0023] The invention according to claim 11 is the invention according to claim 8.
In the invention described in the above, when the load power supply opening / closing means is in the open state, the control means determines that the washing tub is overflowing, and the drain level is forcibly draining the washing liquid in the washing tub. The operation of the drain pump cannot be stopped until the water level falls below the predetermined water level.If the water supply valve has failed and water cannot be stopped, the user must turn off the drain pump before closing the water tap. It is possible to prevent the driving from being stopped and prevent the water from overflowing from the washing tub.

[0024]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the conventional example are denoted by the same reference numerals, and description thereof is omitted.

(Embodiment 1) As shown in FIG.
Is composed of a motor 4, a water supply valve 6, a drain valve drive motor 17 for operating the drain valve 8, and the like.
And operates sequentially according to the washing, rinsing, and dewatering processes. The load power supply switching means 20 includes a load 16
Open and close the AC power supply 21 connected to.

The DC power supply 22 is connected to the AC power supply 21,
Power is supplied to the control means 18. Water level detecting means 23
Detects the water level in the washing and dewatering tub (washing tub) 2 and inputs its output to the control means 18 so that water can be supplied to a predetermined water level. Further, the water level detection means 23 detects the water level in the washing and dewatering tub 2 even when the load power supply opening / closing means 20 is in an open state.

The operation display means 24 is for inputting operation settings such as washing, rinsing, dehydration, etc., start of operation, temporary stop, and the like, and displays the contents of the operation state or the like in the event of an abnormality. 26, and this switch 25
Is a normally open type that inputs the power on / off,
The switch is turned on only while it is being pressed, and the load power supply switching means 20 is closed when the switch 25 is turned on. The abnormality notifying means 26 notifies an abnormality by an alarm sound when an abnormality occurs.

The control means 18 includes a load power switching means 20
When the water level of the washing and dewatering tub 2 drops at a constant speed in a state where the washing liquid is accumulated in the washing and dewatering tub 2 in the open state, it is determined that the water leakage of the washing and dewatering tub 2 is abnormal. The abnormality is reported by the reporting means 26, and the load power supply switching means 20 is kept open.

When the load power supply opening / closing means 20 is open and the washing liquid is accumulated in the washing / dewatering tub 2, the control means 18 operates when the water level of the washing / dewatering tub 2 rises. It is determined that an overflow has occurred, the abnormality is notified by the abnormality notification means 26, and the load power supply opening / closing means 20 is kept open.

The operation of the above configuration will be described with reference to FIG. 2. When the AC power supply 21 is connected in step 31, the DC power supply 22 is always energized in step 32, and the control means 18 is energized in step 33. Step 34
In step 35, the water level detecting means 23 is energized.

If there is no fluctuation in the water level of the washing and dewatering tub 2 in step 35, it is constantly monitored in step 36 whether the switch 25 provided on the operation display means 24 has been pressed. In step 37, the operation display means 24 is turned on to display an initial standby state for accepting operation settings and the like. In step 38, the load power supply opening / closing means 20 is closed, and the process proceeds to the next step. If the switch 25 is not pressed in step 36, the process returns to step 35.

If there is a fluctuation in the water level of the washing and dewatering tub 2 in step 35, it is determined in step 39 whether the water level is rising. If the water level is not rising, that is, the water level of the washing and dewatering tub 2 is low. Is normal, it is a case where water is leaking out due to poor adhesion of parts, etc., and it is determined in step 40 that the washing and dewatering tub 2 is leaking abnormally, and in step 41, the abnormality notifying means 26 notifies the abnormality. . At this time, the load power supply opening / closing means 20 is kept open. For this reason, even if the power switching means 19 breaks down, the load 16 is not energized, so that runaway and electric shock of the load 16 can be prevented, and safety can be improved.

If the water level is rising at step 39, it is determined at step 42 that the water has overflowed. At step 43, the abnormality notification means 26 notifies the water overflow abnormality. At this time, the load power supply opening / closing means 20 is kept open.

As described above, according to the present embodiment, the AC power supply 2
1 is connected, and the water level of the washing and dewatering tub 2 can be detected even when the load power supply opening / closing means 20 is in an open state, that is, in a state where the power of the body is turned off.

When the water level of the washing and dewatering tub 2 drops, it is usually the case that water is leaking due to poor adhesion of parts or the like. When the water level detecting means 23 detects that the water level has dropped, It is possible to prevent the damage caused by water from spreading by judging that the water leak has occurred and reporting the abnormality. The water level also drops when the user takes out the laundry in the washing and dewatering tub 4 before draining, but the water level at this time does not become constant, so the water level decreases at a constant rate. It is possible to prevent erroneous determination by determining that there is a water leakage abnormality only when the determination is made.

When the water level of the washing and dewatering tub 2 rises, it usually means that the water supply valve 6 has failed and water is leaking. When the water level detecting means 23 detects the rise of the water level,
By judging that the water supply valve 6 is out of order and notifying the abnormality, it is possible to prevent the damage caused by water from spreading. Since the water level rises even if the user supplies water with a bucket or the like, the overflow may be determined to be abnormal only when the water level rises above a predetermined water level set above the washing and dewatering tub 2. Thereby, erroneous determination can be prevented.

(Embodiment 2) As shown in FIG.
Consists of a motor 4, a water supply valve 6, a drainage pump 14, etc.
It is controlled by the control means 28 via the power switching means 19 constituted by a bidirectional thyristor or the like,
It operates sequentially according to each process of rinsing and dehydration.

The control means 28 includes a load power switching means 20
In the open state, when it is determined that the washing and dewatering tub 2 has overflowed, the abnormality notifying unit 26 notifies the abnormality and
The load power supply opening / closing means 20 is closed, and the drainage pump 14
Is driven to forcibly drain the washing liquid in the washing and dewatering tub 2.

When the water level falls below a predetermined level while the drainage pump 14 is forcibly draining the washing liquid in the washing and dewatering tub 2, the operation of the drainage pump 14 is stopped. ing. Other configurations are the same as those in the first embodiment.

The operation of the above configuration will be described with reference to FIG. The operation from step 31 to step 43 is the same as the operation of the first embodiment, and therefore the description is omitted.

If it is determined in step 42 that the water overflow is abnormal, it means that water has leaked due to a failure of the water supply valve 6 and the water level has risen. At this time, the abnormality is notified by the abnormality notifying means 26 at step 43, the load power supply opening / closing means 20 is closed at step 44, and the drain pump 14 is driven at step 45. Therefore, even if the water supply valve 6 breaks down with the power of the machine turned off, it is possible to prevent the washing liquid from overflowing from the washing and dewatering tub 2.

If the amount of water leaking from the water supply valve 6 is smaller than the amount drained by the drain pump 14 and the water level is lower than the predetermined water level, the drain pump 14 is stopped in step 46. Thereby, even if the water supply valve 6 breaks down and water leaks, the drainage pump 14 does not need to be constantly driven, so that power can be saved and the durability of the drainage pump 14 can be increased.

If the amount of water leaking from the water supply valve 6 is equal to the amount of water drained by the drain pump 14 and the water level does not become lower than the predetermined water level, acceptance of operation input of the operation display means 24 is prohibited. The driving of the pump 14 may not be stopped. Thereby, it is possible to prevent the user from noticing the abnormality and stopping the operation of the drain pump 14 before closing the water tap, and to prevent the washing liquid from overflowing from the washing / dewatering tub 2. it can.

[0044]

As described above, according to the first aspect of the present invention, a DC power supply for converting an AC power supply to a DC power supply;
A control unit operated by being supplied with power from the DC power supply, a washing tub for washing laundry, a water level detection unit connected to the control means for detecting a water level of the washing tub, and driven by the AC power supply A load, and a load power supply switching unit connected to the load to open and close the AC power supply, wherein the water level detection unit detects a water level of the washing tub even when the load power supply switching unit is in an open state. Therefore, when the load is turned off, that is, even when the aircraft is turned off, the water level can be detected and controlled by the water level detection means to prevent water from overflowing and prevent damage due to water. Resources can be prevented from being wasted.

According to the second aspect of the present invention, when the load power supply opening / closing means is in the open state and the washing tub is filled with the washing liquid, the water level in the washing tub drops. The control means determines that there is a water leakage abnormality in the washing tub. Therefore, even when the power of the machine is turned off, when the washing liquid leaks due to poor adhesion of parts or the like, the control means determines that the water leakage is abnormal. Control can prevent the spread of damage caused by leaked water.

According to the third aspect of the present invention, the water level of the washing tub drops at a constant speed when the load power supply opening / closing means is in the open state and the washing liquid is accumulated in the washing tub. During the operation, the control means determines that there is a water leakage abnormality in the washing tub, so that when the user takes out the laundry in the washing tub, the water level drops, but the water level at that time drops. Since the speed of the water leakage does not become constant, it can be determined that the water leakage is abnormal only when the water leakage actually occurs.

According to the fourth aspect of the present invention, there is provided water supply means for supplying water to the washing tub, and when the water level of the washing tub rises when the load power supply opening / closing means is open, the control means is provided. Since it is determined that the washing tub is overflowing, if the water supply valve fails and the water supply does not stop in a state where the power of the machine is turned off, the control means determines that the overflow is abnormal and performs control. In addition to preventing waste of valuable water resources, even when leaning the drain hose,
Water can be prevented from overflowing from the washing tub.

According to the fifth aspect of the present invention, when the water level of the washing tub rises above a predetermined water level with the load power supply opening / closing means in an open state, the control means determines that the washing tub has overflowed. Since the determination is made, when the user supplies water with a bucket or the like, it is not determined that the water overflows, but the water overflow can be determined only when the water actually overflows.

According to the sixth aspect of the present invention, there is provided abnormality notification means connected to the control means for notifying an abnormality, wherein the load power supply opening / closing means is in an open state, and the control means is configured to leak water from the washing tub. When an abnormality or an overflow is determined, the abnormality is notified by the abnormality notification means, so that the user can be notified of an abnormality in the event of a water leakage or an overflow, even when the power of the aircraft is turned off. In addition, it is possible to prevent water damage from spreading.

According to the seventh aspect of the present invention, there is provided a display means for performing a display operation, wherein the display means is turned off,
And when the load power supply switching means is in the open state, and the control means determines a water leakage abnormality or an overflow water abnormality in the washing tub, the display means is turned on, and the load power supply switching means is maintained in the open state. Therefore, in the event of an abnormality, the user can be notified of the abnormality while the power supply of the load is turned off, so that runaway or electric shock due to a component failure or the like is less likely to occur, and safety can be improved.

According to the eighth aspect of the present invention, there is provided a drainage pump connected to the load power supply opening / closing means for forcibly draining the washing liquid in the washing tub, and the load power supply opening / closing means is in an open state. Then, when the control means determines that the washing tub overflows, the load power supply opening / closing means is closed, and the drain pump is driven to forcibly drain the washing liquid in the washing tub. Therefore, a washing machine with a drain pump pumps the washing liquid to a place higher than the water level of the washing tub and drains it.Therefore, an overflow port cannot be provided, but when the power of the machine is turned off, the water supply valve fails. Even if the water supply does not stop, the water overflows from the washing tub, preventing the damage caused by the water from spreading.

According to the ninth aspect of the present invention, there is provided an abnormality notification means connected to the control means for notifying an abnormality, wherein the load power supply opening / closing means is in an open state, and the control means is provided for detecting an overflow of the washing tub. When it is determined that the abnormality is notified by the abnormality notification means, the load power supply opening / closing means is closed, and the drainage pump is driven to forcibly drain the washing liquid in the washing tub. And forcibly draining the water with a drain pump, the abnormality can be notified to the user while preventing overflow from the washing tub.

According to the tenth aspect of the present invention,
When the load power supply opening / closing unit is in the open state, the control unit determines that the washing tub overflows, and the water level becomes lower than the predetermined water level when the drainage pump is forcibly draining the washing liquid in the washing tub. In some cases, the drain pump is stopped, so if the water supply valve breaks down and the water does not stop, if the amount of water supply is small, the amount of drainage will be greater than the amount of water supply. Even after the water has run out, the drain pump can be prevented from continuing to operate.

According to the eleventh aspect of the present invention,
When the load power supply opening / closing means is in the open state, the control means determines that the washing tub has overflowed, and the water level becomes lower than the predetermined water level when the drainage pump is forcibly draining the washing liquid in the washing tub. Until the water supply valve has failed and water cannot be stopped until the water faucet is closed, the user must stop the operation of the drain pump before closing the tap. This prevents water from overflowing from the washing tub.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of a washing machine according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of a main part of the washing machine.

FIG. 3 is a block circuit diagram of a washing machine according to a second embodiment of the present invention.

FIG. 4 is an operation flowchart of a main part of the washing machine.

FIG. 5 is a longitudinal sectional view of an example of a conventional washing machine.

FIG. 6 is a longitudinal sectional view of another example of the washing machine.

[Explanation of symbols]

 Reference Signs List 16 load 18 control means 20 load power switching means 21 AC power supply 22 DC power supply 23 water level detection means

Claims (11)

[Claims] A DC power supply for converting an AC power supply to a DC power;
A control unit operated by being supplied with power from the DC power supply, a washing tub for washing laundry, a water level detection unit connected to the control means for detecting a water level of the washing tub, and driven by the AC power supply A load, and a load power supply switching unit connected to the load to open and close the AC power supply, wherein the water level detection unit detects a water level of the washing tub even when the load power supply switching unit is in an open state. Washing machine. 2. When the water level in the washing tub drops when the load power supply opening / closing means is in an open state and the washing liquid is accumulated in the washing tub, the control means determines whether the washing tub has a water leakage abnormality. The washing machine according to claim 1, wherein the determination is made as follows. 3. The control means, when the load power supply opening / closing means is in an open state and the washing liquid is stored in the washing tub and the water level of the washing tub is decreasing at a constant speed, 3. The washing machine according to claim 2, wherein it is determined that there is a water leakage abnormality in the washing tub. 4. A water supply means for supplying water to the washing tub, wherein when the load power supply opening / closing means is open and the water level in the washing tub rises, the control means determines that the washing tub overflows. The washing machine according to claim 1, wherein 5. The washing machine according to claim 1, wherein when the load power supply opening / closing means is in an open state and the water level in the washing tub rises above a predetermined water level, the control means determines that the washing tub has overflowed. Machine. 6. An abnormality notification means connected to the control means for notifying an abnormality, wherein when the load power supply opening / closing means is in an open state and the control means determines a water leakage abnormality or a water overflow in the washing tub, The washing machine according to any one of claims 2 to 5, wherein the abnormality is reported by the abnormality reporting means. 7. Display means for performing a display operation, wherein the display means is turned off and the load power supply switching means is in an open state,
3. The control means, when judging a water leakage abnormality or an overflow abnormality in the washing tub, turns on the display means and holds the load power supply opening / closing means in an open state.
The washing machine according to any one of claims 5 to 5. 8. A drain pump connected to the load power switching means for forcibly draining the washing liquid in the washing tub, wherein the load power switching means is in an open state, and the control means determines whether the washing tub overflows. 6. The method according to claim 1, wherein when the determination is made, the load power supply opening / closing means is closed, and the drainage pump is driven to forcibly drain the washing liquid in the washing tub. The washing machine according to the item. 9. An abnormality informing means connected to the control means for informing an abnormality, wherein the abnormality informing means is provided when the control means determines that the washing tub is overflowing while the load power supply switching means is in an open state. 9. The washing machine according to claim 8, further comprising the step of notifying that the load power supply opening / closing means is in the closed state, and driving the drain pump to forcibly drain the washing liquid in the washing tub. 10. When the load power supply opening / closing means is in an open state and the control means determines that the washing tub has overflowed, and the drainage pump is forcibly draining the washing liquid in the washing tub, the water level becomes predetermined. 9. The washing machine according to claim 8, wherein the drive of the drain pump is stopped when the water level falls below the water level. 11. When the load power supply opening / closing means is open and the control means determines that the washing tub has overflowed, and the drainage pump is forcibly draining the washing liquid in the washing tub, the water level is reduced. 9. The washing machine according to claim 8, wherein the drive of the drain pump cannot be stopped until the water level falls below a predetermined level.