JPH0975288A - Operation method of washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable securing of a proper amount of water and detecting of a trouble in a water level detector by a method wherein water is discharged until the detector detects that the water falls below a specified level and then, the water is supplied until the detector detects that the water reaches a specified level again, in the case where the detector detects that the water reaches the specified level prior to the supply of water. SOLUTION: When a specified level switch 22 of a specified level detector is determined to trip, a control section 38 of a washing machine turns on a drain motor 42 to start draining. Then, when the specified water level switch 22 is determined not to be reset, the drain motor 42 is turned on and then, it is judged whether operation time (4 second) passes or not. When the four second is determined to pass, the drain motor 42 is turned off. Thereafter, the machine stands by until a standby time of 2 second passes and it is judged whether the specified level switch 22 is reset or not. Then, when the switch is determined to be reset, a water valve 28 is turned on to supply water. Then, when the specified level switch 22 is determined to trip, the machine stands by for two second and the water valve 28 is turned off.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a washing machine such as a dishwasher for washing dishes and an instrument washer for washing medical instruments and experimental instruments.

[0002]

2. Description of the Related Art Conventionally, in this type of washing machine, a predetermined amount of water is supplied into a washing chamber, and water stored in the washing chamber is jetted from a jetting device to wash items to be washed such as dishes. There are many things I did.

In such a washing machine, a water level detecting device (for example, a device composed of a float and a micro switch interlocked therewith) is operated to supply water until a predetermined water level is detected to obtain a predetermined amount of water. I am trying. In a normal case, when the equipment is powered on and the cleaning operation is started, water is not supplied into the cleaning chamber, and the water level detection device detects that the predetermined water level has not been reached. Therefore, when cleaning in the cleaning process, water is first supplied in the water supply process.

However, there are rare cases where the water level detection device detects that the water level has reached a predetermined level before water is supplied. The following cases can be considered for this.

The first is a case where a power failure occurs after water supply, during washing, during rinsing, etc., and then the operation is resumed and the washing operation is performed from the beginning. The second is when water is supplied by the user. The third is a case where the water level detection device itself fails (eg, the float does not descend).

Of these, the problems are the second and third cases, and in this case, if the cleaning is performed assuming that water has already been supplied, a problem occurs. That is, when the amount of water becomes very large due to the water being supplied by the user's hand, water easily leaks from the front door portion or the like during cleaning. Also, if the water level detection device is out of order and cleaning is started without water, the cleaning pump will be run dry or the heater will be cooked empty, causing damage to the cleaning pump itself, There is a risk of heat damage to the cleaning room itself and the components inside the room.

Therefore, in order to cope with this, when the water level detecting device has already detected that the water level has reached the predetermined water level before water is supplied, drainage is performed until the water level detecting device detects that the water level has dropped below the predetermined water level. Operate the pump, and then supply water again until the water level detection device detects the predetermined water level,
On the other hand, if the water level detection device does not detect that the water level has dropped below the predetermined water level even after the elapse of a predetermined time limit after the operation of the drain pump, the drain pump is stopped and an alarm is issued by a buzzer or the like. There is something. Such a washing machine is disclosed, for example, in JP-A-63-288122 (A47L15 / 4).
6).

In such a washing machine, it is possible to always wash and rinse with an appropriate amount of water, and it is possible to prevent the water level detecting device from being operated while it is out of order.

[0009]

However, in the above-mentioned washing machine, the drainage pump is stopped (energization stopped) when it is detected that the water level has fallen below a certain level, and the drainage pump is actually stopped completely. Since it takes time, the water is drained during that time, and there is a problem that too much water is discarded.

The present invention relates to a washing machine, which solves such problems, and it is possible to secure an appropriate amount of water and detect a failure of a water level detecting device without wasting as much water as possible. Has an aim.

[0011]

A washing machine according to claim 1 of the present invention detects a water supply device for supplying water into a washing chamber and whether or not the water supplied into the washing chamber has reached a predetermined water level. A detection device, an injection device that injects the water stored in the cleaning chamber toward the article to be cleaned, a drainage device that drains the water from the cleaning chamber, and a storage unit that stores a control procedure in a process such as cleaning and rinsing. , A water supply device according to the control procedure, comprising a control unit for controlling the operation of the injection device and the drainage device, under the control of the control unit, in the water supply process for supplying water to be used in the washing, rinsing process, When the detection device detects that the water in the cleaning chamber has reached the predetermined water level before supplying water, the drainage device is operated, and thereafter, when it is detected that the predetermined water level is broken, the drainage device And operating the water supply device with stops supplying water to be detected and reaches the predetermined water level,
On the other hand, if a predetermined operation time elapses before it is detected that the water level has dropped below the predetermined water level after the operation of the water discharge device, the water discharge device is stopped and the detection device causes the predetermined time after the elapse of a predetermined standby time. It is determined whether or not the water level is detected, and if it is detected that the predetermined water level is broken, the water supply device is operated to supply water until the predetermined water level is detected, and the predetermined water level is set. When it detects that it has not been broken, the drainage device is operated again, and it is detected by the detection device whether or not the predetermined water level has been broken, and further, a predetermined time limit since the drainage device first operated. If the detection device detects that the water level has not fallen below the predetermined water level, the drainage device is stopped and abnormal processing is performed.

In the washing machine according to claim 2 of the present invention, the water level in the washing chamber before water supply is the water level accumulated based on the detection of the predetermined water level by the detection device during the predetermined operation time, and from this water level When water is drained by the normal operation of the drainage device, it is detected that the detection device falls below the predetermined water level by the drainage from when the drainage device is stopped after this time has elapsed until the operation of the drainage device is actually stopped. It is time to do.

In the washing machine according to the third aspect of the present invention, the predetermined waiting time is longer than the time when the control unit stops the operation of the drainage device and then the operation of the drainage device is actually stopped. It is what

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a dishwasher of an embodiment of the washing machine of the present invention, 2 is a machine frame made of metal, and 3 is a cleaning chamber for resin molded products arranged in the machine frame 2. Is.

Reference numeral 4 denotes a tableware inlet provided in the front part of the washing room 3, and a tableware basket (not shown) for storing the tableware.
Is stored in the cleaning room 3 from here. 5 is this inlet 4
It is a door that opens and closes, and the lower end is pivotally supported. The lower end opens as a fulcrum.

Reference numeral 6 is an operation panel provided below the door 5. Reference numeral 7 denotes a control box attached to the back surface of the operation panel 6, in which electrical components such as a microcomputer (described later) that forms the center of the control mechanism of the dishwasher 1 are stored.

Reference numeral 8 denotes a nozzle tower provided substantially in the center of the bottom of the cleaning chamber 3, and reference numeral 9 denotes a long nozzle body rotatably supported by the nozzle tower 8 in a horizontal direction.
A plurality of injection ports 10 ... Are formed on the upper surface of the nozzle body 9.

Reference numeral 11 is a cleaning pump arranged at the outer bottom of the cleaning chamber 3, and water (cleaning water or rinse water) stored in the bottom of the cleaning chamber 3 is passed through the nozzle tower 8 to the nozzle body 9. And send.

Thus, at the time of cleaning and rinsing, the cleaning pump 11 operates to circulate the cleaning water and the nozzle body 9
From above, wash water is sprayed toward the tableware above. In addition, the nozzle tower 8, the nozzle body 9 and the cleaning pump 1
Reference numeral 1 constitutes the injection device of the present invention.

Reference numeral 12 denotes a drain tank which is formed at the front part of the bottom surface of the cleaning chamber 3 and is connected to the cleaning pump 11. Reference numeral 13 is a filter provided above the drainage tank 12 for collecting debris such as leftovers dropped from tableware.

Reference numeral 14 is a drainage pump connected to the drainage tank 12 for draining the water in the cleaning chamber 3 through the drainage hose 15 to the outside of the machine. These drainage pumps 1
The drainage hose 4 and the drainage hose 15 constitute the drainage device of the present invention.

Reference numeral 16 denotes a loop-shaped sheathed heater which is provided from near the center of the bottom of the cleaning chamber 3 to the rear, and warms the cleaning water and rinse water, and raises the temperature inside the cleaning chamber 3 during drying to clean and wash. It enhances the drying effect.

Reference numeral 17 is a water level detection chamber provided in the lower rear part of the cleaning chamber 3. FIG. 2 shows the details of the water level detection chamber 17. In FIG. 2, reference numeral 18 denotes a water injection port formed in a lower portion of a wall that divides the water level detection chamber 17 and the cleaning chamber 3, and the water injection port 18 connects the water level detection chamber 17 and the cleaning chamber 3 to each other. . Reference numeral 19 denotes a water supply port integrally provided with one end of the top surface of the water level detection chamber 17, and a water supply pipe described later is connected to the water supply port 19. Then, the water supplied from the water supply pipe passes through the water level detection chamber 17 and enters the water injection port 18
It flows into the cleaning chamber 3 more.

Reference numeral 20 is a predetermined position detecting device provided in the water level detecting chamber 17 for detecting whether or not the water level in the cleaning chamber 3 has reached a predetermined water level suitable for cleaning and rinsing.
This predetermined position detection device 20 includes a predetermined position float 21 arranged in the water level detection chamber 17, a predetermined position switch 22 such as a micro switch arranged on the top surface of the water level detection chamber 17, and one end thereof The rotation lever 23 is connected to the localization float 21 and rotates in conjunction with the float. When there is no water in the water level detection chamber 17 and the predetermined position float 21 is located at the bottom, the other end of the rotating lever 23 presses the switch part of the predetermined position switch 22. The switch 22 is ON (reset). On the other hand, as the water level in the water level detection chamber 17 rises, the float 21 rises by a predetermined amount and the water level is washed,
When the predetermined water level suitable for rinsing is reached, the other end of the rotary lever 23 separates from the switch portion of the predetermined position switch 22, whereby the predetermined position switch 22 is turned off (tripped).
The predetermined position detection device 20 corresponds to the detection device of the present invention.

Reference numeral 24 is an abnormal position detecting device provided in the water level detecting chamber 17 for detecting whether or not the water level in the cleaning chamber 3 reaches an abnormal water level above the predetermined water level. The abnormal position detection device 24 includes an abnormal position float 25 arranged in the water level detection chamber 17, and an abnormal position switch 26, which is, for example, a reed switch, arranged on the top surface of the water level detection chamber 17. When the water level in the cleaning chamber 3 reaches the abnormal water level, the abnormal position switch 26 is turned on by the operation of the abnormal position float 25.

Referring back to FIG. 1, reference numeral 27 is a water supply pipe connected to the water level detection chamber 17, and is connected to an external water supply source such as water supply. An electromagnetic water supply valve 28 is provided in the middle of the water supply pipe 27, and water supply is controlled by opening and closing the water supply valve 28.

Reference numeral 29 is a temperature sensor attached to the outer bottom surface of the cleaning chamber 3. As the temperature sensor 29, for example, a thermistor is used.

Reference numeral 30 denotes a circulation air passage provided at the rear of the cleaning chamber 3, which takes in air in the cleaning chamber 3 from an outlet 31 provided at an upper part of the rear wall and introduces it at a lower part of the rear wall. Air is circulated by returning from the mouth 32. Reference numeral 33 denotes a cooling air passage provided behind the circulation air passage 30 for allowing outside air to pass therethrough, and 34 denotes a double-sided fan provided so as to partition the circulation air passage 30 and the cooling air passage 33. And the air in the cooling air passage 33 are forcedly circulated at the same time,
The air in the circulation air passage 30 is heat-exchanged with the air in the cooling air passage 33 to remove moisture. A fan motor 35 drives the double-sided fan 34.

FIG. 3 shows a control mechanism of the dishwasher 1 of this embodiment, and 36 is a microcomputer (hereinafter referred to as a microcomputer), which is composed of a storage unit 37, a control unit 38, a timer unit 39 and the like. .

The storage unit 37 stores a control program showing a control procedure in the cleaning operation. Also,
An operation time (4 seconds), a waiting time (2 seconds), and a time limit (30 seconds) described later are stored.

The cleaning operation is an operation for sequentially executing the cleaning process and the rinsing process. The cleaning process further includes a water supply process-a cleaning process-a drainage process. Further, the rinsing process further includes a water supply process-a rinsing process-a draining process.

The control unit 38 controls various loads on the output side according to the control program based on various inputs.

Reference numeral 40 denotes an operation key group, which is composed of a setting key for setting various operating conditions in the cleaning operation, a start key for starting the cleaning operation, and the like. The operation key group 40 is arranged on the operation panel 6, and is connected to the input side of the microcomputer 36, like the predetermined position switch 22, the abnormal position switch 26, and the temperature sensor 29.

Reference numeral 41 is a cleaning motor for driving the cleaning pump 11, and 42 is a draining motor for driving the drainage pump 14. Reference numeral 43 denotes a buzzer device for notifying the end of the cleaning operation and the occurrence of an abnormality. Reference numeral 44 denotes a display device for indicating the progress of the cleaning operation and for notifying the occurrence of an abnormality.

Reference numeral 45 is a load drive circuit provided between the output side of the microcomputer 36 and the washing motor 41, the drain motor 42, the water supply valve 28 and the fan motor 35.
The load drive circuit 45 is composed of, for example, a triac. The load drive circuit 45 is provided in the microcomputer 3
In accordance with a control signal from 6, a commercial power source (for example, 100 V AC power source) is supplied to each load such as the cleaning motor 41 to operate them.

Next, based on the above configuration, the operation in the water supply process performed in the cleaning process and the rinsing process, which is the gist of the present invention, will be described with reference to the flowchart of FIG.

In the water supply process, first, the control unit 38 determines in step 1 (hereinafter, step is abbreviated as S) whether the predetermined position switch 22 is tripped or reset. In the normal case, since the water supply has not been performed yet and the predetermined position switch 22 has been reset, the process proceeds to S2, the water supply valve 28 is turned on (energized), and the water supply is started.
Then, the predetermined position switch 22 trips, and when 2 seconds elapse, the water supply valve 28 is turned off (energization stopped) to stop the water supply (S3 to S5).

On the other hand, the predetermined position switch 22 may have tripped before water supply, and it may be determined in S1 that the predetermined position switch 22 has tripped. This may include the following cases. The first is after water supply or during cleaning,
This is the case where a power failure occurs during rinsing, etc., and then the power is restored and the cleaning operation is performed from the beginning. The second is when water is supplied by the user. The third is a case where the predetermined position detection device 20 itself fails such that the predetermined position float 21 does not descend. Of these, the first case is particularly likely to occur.

The controller 38 controls the predetermined position switch 22 in S1.
If it is determined that the trip has occurred, the drain pump 14 is turned off.
Turn on N (energize) and start draining. Next, in S7, it is determined whether or not the predetermined position switch 22 has been reset. If it is determined that the switch 22 has been reset, the drain pump 14 is turned off (energization stopped) in S8. Then, it transfers to S2 and performs water supply based on the water level detection of the predetermined position switch 22 (S2-S5).

On the other hand, when the control unit 38 determines in S7 that the predetermined position switch 22 has not been reset, in S9, it is determined whether or not the operation time (4 seconds) has elapsed since the drainage pump 14 was turned on. To do.

When it is determined in S9 that 4 seconds have elapsed, the control unit 38 turns off the drainage pump 14 in S10. After that, until the waiting time (2 seconds) elapses, that is, until the drainage pump 14 completely stops and the fluctuation of the water level disappears (S11), it is then determined in S12 whether or not the predetermined position switch 22 is reset. judge.

The operating time (4 seconds) is the water level in the cleaning chamber 3 before water supply, that is, the water level at which cleaning and rinsing are performed, that is, S2.
When the water level is stored from the operation of S5 and the water is drained from this water level by the operation of the normal drainage pump 14,
This is the time for which the predetermined position switch 22 is reset by drainage until the operation of the drainage pump 14 is actually stopped after the control unit 38 turns off the drainage pump after this time elapses, and is determined in advance by experiments or the like. is there.

The waiting time (2 seconds) is set by the control unit 3
8 turns off the drainage pump 14 and then the drainage pump 14
Is longer than the actual stop time, and like the operation time, is determined in advance by experiments or the like.

Therefore, in the case of the first case described above, that is, in the case where a power failure occurs when water is already stored in the cleaning chamber 3 and the cleaning operation is restarted from the beginning after the recovery, the water level at this time is changed. Is the water level accumulated by the operations of S2 to S5, so normally, when the drainage pump 14 actually stops after the operation time (4 seconds) has elapsed, the predetermined position switch 22
Resets. Therefore, the control unit 38 determines that the predetermined position switch 22 is reset in S12, and then S2
Then, the water is supplied in S2 to S5.

On the other hand, as in the case of the second case described above, when a large amount of water is stored because the water is manually supplied, the predetermined position switch 22 is turned on in the operating time (4 seconds). Do not reset. For this purpose, the control unit 38
If it is determined in S12 that the predetermined position switch 22 has not been reset, the drain pump 14 is turned on again to perform drainage. Then, in S14, it is determined whether or not the predetermined position switch 22 is reset, and if it is determined that the switch 22 is reset, the drain pump 14 is turned off in S15, the process proceeds to S2, and S2 to S2.
Water is supplied at 5.

Further, as in the third case described above, in the case where the predetermined position detection device 20 itself is out of order and the predetermined position switch 22 trips even when there is no water,
The predetermined position switch 22 does not reset forever.

Therefore, if the control unit determines in S16 that the time limit (30 seconds) has elapsed since the drainage pump 14 was turned ON in S13 before determining in S14 that the predetermined position switch 22 has been reset, The drain pump 14 is turned off in S17. Then, in S18, it is determined that the predetermined position detection device 20 is out of order, and the buzzer device 43 and the display device 44 are operated to notify the occurrence of abnormality.

Next, another operation is shown in the flowchart of FIG. In the operation shown in FIG. 4 described above, after the operation time (4 seconds) has passed and the drainage pump 14 is turned off, the standby time (2
(Seconds), the operation (S9 to S12) of determining whether or not the predetermined position switch 22 is reset is performed only once.
In other operations shown in FIG. 5, while the predetermined position switch 22 is not reset, it is determined whether or not the predetermined position switch 22 is reset by turning off the drainage pump 14 every operating time (4 seconds) ( S7-S12). Moreover, when the time limit (30 seconds) elapses after the drain pump 14 is first turned on, an abnormality is notified (S13 to S1).
5).

As described above, in the dishwasher of this embodiment, when the predetermined position switch 22 is tripped before water supply, the predetermined position switch 22 is drained until the predetermined position switch 22 is reset, and then the predetermined position switch 22 is tripped again. Since the water is supplied up to this time, it is possible to always wash and rinse with an appropriate amount of water, and it is possible to prevent the operation while the water level detection device is out of order.

Moreover, as a method of draining water until the predetermined position switch 22 is reset, not only a method of turning on the drainage pump 14 until the predetermined position switch 22 is reset, but also turning off the drainage pump 14 at a predetermined operating time. As a result, the drain pump is turned on until just before the predetermined position switch 22 is reset, and the control unit 38 causes the drain pump 14 to operate.
A method of resetting the predetermined position switch 22 by drainage while the drainage pump 14 is actually stopped after turning off the
That is, the drainage pump 14 is turned off in consideration of drainage due to inertial rotation of the drainage pump 14. Therefore, it is possible to reduce the amount of wasted water discarded due to the inertial rotation of the drainage pump after the predetermined position switch 22 is reset.

Therefore, it is possible to secure an appropriate amount of water and detect a failure of the water level detection device without wasting water as much as possible.

Further, the most likely cause of the trip of the predetermined position switch 22 before water supply is a power failure in a state where water is already stored in the cleaning chamber 3, and a cleaning operation is restarted from the beginning after recovery. However, here, the operation time is the water level in the cleaning chamber 3 before water supply is the water level at which washing and rinsing are performed, and the water is drained from this water level by the operation of the normal drainage pump 14. In this case, since this time elapses, the control unit 38 turns off the drainage pump 14 and the predetermined position switch 22 is reset by drainage until the operation of the drainage pump 14 actually stops. In case of operating time, drain pump 14
The switch 22 can be surely reset by stopping, and wasteful drainage can be surely eliminated.

Further, the control unit 38 turns off the drainage pump 14 for a waiting time from when the drainage pump 14 is turned off until it is determined whether or not the predetermined position switch 22 is reset.
After that, the time is set to be longer than the time when the drainage pump 14 actually stops (inertia operation time), so that it is possible to make a determination when the fluctuation of the water level is completely stopped, and it is possible to make a reliable determination.

In the above embodiment, the drainage pump is used as the drainage device, but the drainage device is not limited to this, and the drainage device may be an electromagnetic drainage valve. However, the drainage pump is OF
Since the time lag from F to the actual stop is large, the effect of the present invention is greatly exerted.

Further, the present invention may be an instrument washing machine for washing medical / experimental instruments instead of a dishwasher.

[0057]

According to the washing machine of claim 1 of the present invention,
If the detection device detects that the water level has reached the specified level before water supply, drain the water until the detection device detects that the water level has dropped below the specified water level, and then detect it again when the detection device reaches the specified water level. Since the water is supplied, it is possible to always wash and rinse with an appropriate amount of water, and it is possible to prevent the water level detection device from being operated while it is out of order.

Moreover, as a method of draining water until the detection device detects that the water level has fallen below the predetermined water level, not only a method of operating the drainage device until the detection device detects that the water level has fallen below the predetermined water level, but also draining water at a predetermined operating time By stopping the device, operate the drainage device just before breaking the prescribed water level,
A method for causing a detection device to detect that a predetermined water level has been broken down by drainage while the control unit stops the drainage device and then the device actually stops, that is, a method for stopping the drainage device in consideration of drainage due to inertial motion of the drainage device. Is taking. Therefore, it is possible to reduce the amount of wasted water discarded by the inertial operation of the drainage device after detecting that the water level has fallen below the predetermined level.

Therefore, it is possible to secure an appropriate amount of water and detect a failure of the water level detecting device without wasting water as much as possible.

Furthermore, the most likely cause of the detection device detecting that the water level has reached the predetermined water level before water supply is that a power failure occurs when water is already stored in the cleaning chamber, and after the recovery, it starts again from the beginning. When the washing operation is started,
In the washing machine according to claim 2 of the present invention, when the operating time is such that the water level in the washing chamber before water supply is the water level at which washing and rinsing are performed, and when water is drained from this water level by the operation of the normal drainage device, Since the detection unit detects that the water level has fallen below the predetermined water level due to the drainage from the time when the control unit stops the drainage system to the time when the operation of the drainage system actually stops, the operation in the above cases By stopping the drainage device in time, the detection device can detect that the water level has fallen below the predetermined water level, and wasteful drainage can be reliably eliminated.

Further, in the washing machine according to the third aspect of the present invention, the waiting time from when the drainage device is stopped to when it is determined whether or not the detection device detects that the water level has fallen below the predetermined water level is determined by the inertia of the drainage device. Since the time is longer than the operation time, it is possible to make a determination when the fluctuation of the water level is completely stopped, and it is possible to make a reliable determination.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a configuration of a dishwasher which is an embodiment of a washing machine of the present invention.

FIG. 2 is a rear sectional view showing details of a water level detection chamber.

FIG. 3 is a block diagram showing a control mechanism.

FIG. 4 is a flowchart showing an operation in a water supply process.

FIG. 5 is a flowchart showing another operation in the water supply process.

[Explanation of symbols]

 3 Washing room 8 Nozzle tower (injection device) 9 Nozzle body (injection device) 11 Cleaning pump (injection device) 14 Drainage pump (drainage device) 15 Drain hose (drainage device) 20 Predetermined position detection device (detection device) 21 Predetermined position Float 22 Predetermined position switch 23 Rotating lever 27 Water supply pipe (water supply device) 28 Electromagnetic water supply valve (water supply device) 37 Storage unit 38 Control unit

Claims (3)

[Claims] 1. A water supply device for supplying water to the cleaning chamber, a detection device for detecting whether or not the water supplied to the cleaning chamber has reached a predetermined water level, and a tool to be cleaned for water stored in the cleaning chamber. Device for injecting toward, a drainage device for draining from the cleaning chamber, a storage unit for storing control procedures in strokes such as cleaning and rinsing, and operations of the water supply device, the injection device, and the drainage device according to the control procedures. And a control unit for controlling, under the control of the control unit, in the water supply process of supplying the water used in the washing and rinsing process, the water in the cleaning chamber is the water before the water supply by the detection device. When it is detected that the predetermined water level has been reached, the drainage device is operated, and then, when it is detected that the predetermined water level has been broken, the drainage device is stopped and the water supply device is operated to operate the predetermined water level. Water is supplied until it is detected that the drainage device has been operated, and if a predetermined operation time elapses before it is detected that the water level has dropped below the predetermined water level after the drainage device has been operated, the drainage device is stopped and a predetermined standby state is established. After a lapse of time, it is determined whether or not the detection device has detected that the predetermined water level has been broken down, and when it has detected that the predetermined water level has been broken down, the water supply device is operated to reach the predetermined water level. Water is supplied until it is detected, and if it is detected that the predetermined water level has not been broken, the drainage device is operated again, and it is detected by the detection device whether or not the predetermined water level has been broken down. Even if a predetermined time limit has elapsed after the operation of the cleaning device, if the detection device detects that the predetermined water level has not been diminished, the drainage device is stopped and abnormal cleaning is performed. Machine operation Law. 2. The predetermined operation time is a water level in which the water level in the washing chamber before water supply is stored based on the detection of the predetermined water level by the detection device, and the water is drained from this water level by a normal operation of the drainage device. In this case, the time when the detection device detects that the predetermined water level has been diminished by the drainage from when the drainage device is stopped after this time elapses until the operation of the drainage device is actually stopped. How to operate the washing machine. 3. The washing machine according to claim 1, wherein the predetermined standby time is a predetermined time longer than a time when the control unit stops the operation of the drainage device and then the operation of the drainage device actually stops. How to operate.