TWI832881B - washing machine - Google Patents

Abstract

The washing machine of the present disclosure includes: a casing; an outer tank elastically supported inside the casing; an inner tank enclosed in the outer tank and configured to rotate freely; a water supply part for supplying water to the outer tank; and a water level. The detection part detects the water level in the outer tank; the drainage part drains the water in the outer tank; the foam detection part includes a pair of electrodes composed of a first electrode and a second electrode; and a control part, Controls a washing operation consisting of at least one of washing, flushing, and dehydration. When the resistance between the pair of electrodes is lower than a predetermined value before the water level reaches the predetermined water level, the control unit determines that there is a short circuit between the pair of electrodes.

Description

washing machine

Field of invention This disclosure relates to a washing machine that stirs clothes and washing water.

Background of the invention Japanese Patent Application Laid-Open No. 2007-117139 discloses a washing machine that suppresses the generation of detergent foam during washing.

The drum-type washing machine in Japanese Patent Application Publication No. 2007-117139 has: an outer tank; a rotating drum that is freely rotatable in the outer tank; a drainage unit that drains the washing water in the outer tank; and a foam detection unit. Consists of a pair of electrodes. After the foam detection unit detects foam, the control unit will shift to a weak washing program and will not cause the drainage unit to operate within a predetermined time. After the predetermined time has passed, if the foam detection part does not detect foam, the control part will return to the normal washing process. If the foam detection part detects foam, it will cause the drainage part to operate and drain the water in the outer tank. drain.

Summary of the invention However, the above-mentioned conventional washing machine has a problem that it cannot determine the generation of detergent foam when a short circuit occurs in the foam detection part.

The present disclosure provides a washing machine equipped with a foam detection part for detecting the generation of detergent foam generated during washing, and capable of appropriately handling a short circuit of the foam detection part.

The washing machine in the present disclosure includes: a casing; an outer tank elastically supported inside the casing; an inner tank enclosed in the outer tank and configured to rotate freely; a water supply part that supplies water to the outer tank; The water level detection part detects the water level in the outer tank; the drainage part drains the water in the outer tank; the foam detection part includes a pair of electrodes composed of a first electrode and a second electrode; and a control part , controls the washing operation consisting of at least one of washing, flushing, and dehydration. When the resistance between the pair of electrodes is lower than a predetermined value before the water level reaches the predetermined water level, the control unit determines that there is a short circuit between the pair of electrodes.

The washing machine of the present disclosure is equipped with a foam detection part for detecting the generation of detergent foam during washing, and can appropriately deal with the short circuit of the foam detection part.

Form used to implement the invention Hereinafter, embodiments will be described in detail with reference to appropriate drawings. (Embodiment 1)

FIG. 1 is a side cross-sectional view of the drum-type washing machine in Embodiment 1 of the present disclosure.

As shown in FIG. 1 , the water tank 33 is vibration-proof and supported to be swingable by a vibration-proof member 41 or the like arranged below the washing machine body 39 . The rotating drum 31 is rotatably installed in the water tank 33, and the rotation center is inclined downward from the front side toward the back side. The rotating drum 31 is formed in a bottomed cylindrical shape, and is provided with a plurality of water holes 32 on the entire outer peripheral surface. A plurality of protruding plates 36 for clothes agitation are provided on the inner wall surface of the rotating drum 31 . An opening 38 is provided on the front side of the water tank 33 and the rotating drum 31, and the opening 38 is covered by a cover 37 so as to be openable and closable. By opening the cover 37 , the user can take out the laundry and put it into the rotating drum 31 through the opening 38 .

The water supply valve (water supply part) 44 supplies water into the water tank 33 through the water supply path 45 . The control part 57 is arranged below the main body. One end of the drainage path 42 is connected to the lower part of the water tank 33 , and a drain valve (drainage part) 43 is connected to the other end of the drainage path 42 to drain the wash water in the water tank 33 .

A rotating shaft 34 is provided on the back side of the rotating drum 31 . The rotating shaft 34 is connected to the motor 35 installed on the back of the water tank 33 . The motor 35 is composed of a brushless dc motor or the like, and is controlled by the control unit 57 and a drive circuit (not shown) to be capable of forward and reverse rotation and variable rotational speed. The load applied to the motor 35, that is, the amount of laundry, is detected through the signal from the current detection circuit (not shown).

The drum-type washing machine is configured to realize a drying function and includes a heater 47 , a blower fan 48 , and a warm air blower path 49 . In addition, a warm air inlet (not shown) for taking in the air in the water tank 33 is provided on the upper surface and back of the water tank 33 . The warm air supply port 51 is provided above the back of the water tank 33 . Warm air will flow into the water tank 33 and the rotating drum 31 in the direction of arrow a, and the air inside the rotating drum 31 and the water tank 33 will be heated and circulated, and the laundry will be dried.

The control unit 57 receives information from the input setting unit 58 for setting the operation stroke and the like. Based on the input information, the control unit 57 causes the display unit 59 to display the set content to notify the user. In addition, after the setting operation is started by inputting the setting part 58, data from the water level detection part 46 and the like that detects the water level in the water tank 33 are input to the control part 57, and the control part 57 passes the load driving part (not shown). (shown) to control the operations of the drain valve 43, water supply part 44, blower fan 48, heater 47, etc. In addition, the control unit 57 controls the motor 35 through a drive circuit (not shown). The control unit 57 performs a washing step consisting of at least one of washing, flushing, dehydration, and drying.

The foam detection part 70 is composed of an electrode 70a disposed on the lower side below the water tank 33, and is disposed above the water tank 33, or is disposed in the warm air supply path 49 from the warm air supply port 51. It is composed of a pair of upper electrodes 70b in a predetermined area. Here, the predetermined area means an area where the lotion foam generated in the water tank 33 can reach the upper electrode 70b. This is because the generation of lotion foam can be detected when the lotion foam reaches the upper electrode 70b. In addition, the upper electrode 70b is arranged at a higher position than the lower electrode 70a.

Next, the positions where the lower electrode 70a and the upper electrode 70b are arranged will be further described using FIG. 1 . The water levels h1, h2, and h3 all indicate the water levels of the wash water in the water tank 33 when the lower end of the water tank 33 is used as a reference. The water level h1 is the water level when performing the normal cleaning procedure described below. The water level h2 is a water level corresponding to the height position of the lower end of the rotating drum 31 . The water level h3 is a water level corresponding to the height position of the lower electrode 70a. As shown in Figure 1, the height of the water level is in the relationship h1>h2>h3. As an example, the water level h1 is about 100 mm higher than the water level h2.

The lower electrode 70a is disposed at a height corresponding to the water level h3 which is lower than the water level h2. That is, the lower electrode 70 a is disposed below the water tank 33 at a lower position than the rotating drum 31 . Thereby, short circuit and abnormal foaming of the foam detection part 70 can be distinguished for identification. The upper electrode 70b is disposed higher than the water level h1.

In addition, in FIG. 1 , although the lower electrode 70 a and the upper electrode 70 b are disposed behind the water tank 33 , the present invention is not limited thereto. The lower electrode 70 a and the upper electrode 70 b may also be disposed in the water tank 33 . Ahead.

The foam detection unit 70 is connected to a resistance value determination circuit (not shown). By comparing with the reference resistance in the resistance value determination circuit, the resistance between the lower electrode 70a and the upper electrode 70b is detected. As long as the resistance value between the lower electrode 70a and the upper electrode 70b is equal to or higher than the threshold value, the control unit 57 will determine that no foam has entered between the pair of electrodes. If foam invades between a pair of electrodes, an electrical path caused by the foam will be formed between the lower electrode 70a and the upper electrode 70b immersed in water, and a resistance value lower than the threshold value will be detected. The determination resistance value of the resistance value determination circuit is set to be less than the threshold value (for example, 500 kΩ) when bubbles are present, and is set to be above the threshold value (for example, 500 kΩ) when bubbles are not present.

Regarding the drum-type washing machine configured as above, the operation and function when the foam detection unit detects foam during washing will be described using FIGS. 2 to 4 .

Fig. 2 is an operation flow chart of the control unit of the drum-type washing machine in Embodiment 1 of the present invention. Fig. 3(a) is a schematic diagram when abnormal foaming occurs in the foam detection unit of the drum-type washing machine. Fig. 3(a) b) is a schematic diagram when a short circuit caused by accumulation occurs in the foam detection part of the same drum-type washing machine. Figure 4 shows the time change of the resistance value of the foam detection part of the same drum-type washing machine and the water level in the water tank. schematic diagram.

After starting the cleaning step, the foam detection unit 70 will start detecting the resistance value. During the period until the water level in the water tank 33 reaches the water level h2 corresponding to the height of the lower end of the rotating drum 31 (S101), the resistance value detected by the foam detection unit 70 does not fall below the threshold value (for example, 500 kΩ) (S102, No), the control unit 57 will determine that a short circuit does not occur between the pair of electrodes and perform the normal cleaning process (S103). Here, the so-called normal cleaning procedure (S103) refers to, for example, supplying water to the water level h1, and then rotating the rotating drum 31 for 12 seconds and then stopping for a stirring time of 1 second, and operating at a rotation speed of 45 r/min. Here, the so-called normal cleaning process is also called the first cleaning process.

As shown by the dotted line B in Figure 4, in the normal cleaning process (S103), after reaching the water level h2, it will be determined whether the resistance value of the foam detection part 70 is less than the threshold value (S104). If the resistance value is less than the threshold value, the control part 57, it will be determined that abnormal foaming has occurred (S105). Abnormal foaming occurs because the wash water containing detergent components is stirred by the rotation of the rotating drum 31, and as shown in FIG. 3(a), electricity is energized between the pair of electrodes. When it is determined that abnormal foaming has occurred, the control unit 57 performs a defoaming process such as draining the water in the water tank 33 through the drainage unit 43 (S106).

Then, after the first predetermined time, for example, 15 minutes of normal cleaning program (S107), the control unit 57 ends the cleaning step (S108) and moves to the next step.

On the other hand, as shown by the solid line A in Figure 4, if the resistance value of the foam detection part 70 is already less than the threshold value before the water level reaches h2 (S102, Yes), the control part 57 can determine abnormal foaming and Didn't happen. This is because the wash water containing the detergent components is not stirred by the rotation of the rotating drum 31 until the water level in the water tank 33 reaches h2, so that abnormal foaming does not occur. Therefore, when the resistance value is less than the threshold value, it can be determined that a short circuit has occurred between the electrodes. Therefore, if the resistance value is already less than the threshold value before the water level reaches h2 (S102, Yes), the control unit 57 will determine that a short circuit has occurred (S109 ).

The short circuit between the electrodes is caused by the accumulation of deposits between the electrodes. Deposits refer to residues of detergent ingredients (detergent residues) or lint from laundry. When these are accumulated between the electrodes of the foam detection part 70, as shown in FIG. 3(b), the washing water will use the residue or lint of the detergent component as a medium to form a thin film through surface tension, so that the electrodes short circuit between.

After S109, no matter what value the resistance value detected by the foam detection unit 70 becomes, the water in the water tank 33 will not be drained by the drain unit 43 from the end of cleaning (S108) to the next step. Drainage action. This is because as mentioned above, something other than foam has adhered between the pair of electrodes, and the control unit 57 is in a state in which it is unable to accurately determine whether there is abnormal foaming in the water tank 33 based on the resistance value between the pair of electrodes. When it is determined that there is a short circuit (S109), the foam detection unit 70 does not function normally. Therefore, if the drainage operation is performed based on the determination of the foam detection unit 70, there is a risk that abnormal foaming may be detected incorrectly even though abnormal foaming is not actually occurring. Once an erroneous detection occurs, not only will useless drainage be caused, but the detergent components contained in the washing water in the water tank 33 will also be drained together, so the cleaning performance will be significantly reduced.

However, after S109 and until the cleaning step is completed (S108), abnormal foaming may occur. Therefore, when the short circuit determination is made (S109), the control unit 57 executes the first step to suppress abnormal foaming. Weak cleaning program (S110). The first weak cleaning program means, for example, that the rotating drum 31 is rotated for 10 seconds and then stopped for a weak stirring time of 5 seconds, and is operated at a rotation speed of 35 r/min. The first weak cleaning program can suppress foaming because the stirring is weaker than the normal cleaning program (S103). In addition, the so-called "stirring is weaker than the normal cleaning process" means that at least one of the rotation number and the rotation time of the rotating drum 31 is smaller than the normal cleaning process. Here, the so-called first weak cleaning process is also called a second cleaning process.

After that, the cleaning step continues for a second predetermined time (S111), for example, after 15 minutes of cleaning, the control unit 57 ends the cleaning step (S108) and moves to the next step.

Then, a series of washing operations such as flushing, dehydration, and drying are performed in sequence, and at the end of the operation, the control unit 57 causes the display unit 59 to display that a short circuit determination has been made to notify the user. Thereby, the user will recognize that the foam detection unit 70 does not function properly, and can operate the washing tank 33 or the rotating drum 31 itself (for example, the tank cleaning stroke). Thereby, the detergent residue accumulated between the pair of electrodes of the foam detection part 70 will be removed, and the washing machine can be prevented from being used in a short-circuited state between the pair of electrodes.

As mentioned above, the drum-type washing machine in this disclosure includes: a washing machine body 39; a water tank 33 elastically supported inside the washing machine body 39; a rotating drum 31 enclosed in the water tank 33 and configured to rotate freely; a water supply valve 44. Supply water to the water tank 33; the water level detection part 46 detects the water level in the water tank 33; the drain valve 43 drains the water in the water tank 33; the foam detection part 70 consists of a pair of electrodes, that is, the lower electrode 70a and an upper electrode 70b; and a control unit 57 that controls a washing operation consisting of at least one of washing, flushing, and dehydration. When the resistance between the electrodes 70a and 70b is lower than the predetermined value while the water supply unit 44 supplies water until the water level in the water tank 33 reaches the predetermined level, the control unit 57 determines that the electrodes 70a and 70b are short-circuited.

Thereby, even if a short circuit occurs between the lower electrode 70a and the upper electrode 70b, the increase of foam due to abnormal foaming can be suppressed, and unnecessary drainage can be prevented. Therefore, the drum-type washing machine in this embodiment can properly deal with the short circuit of the foam detection part 70 .

The predetermined water level may also be equivalent to the height of the lower end of the rotating drum 31 .

The lower electrode 70a may be disposed lower than a predetermined water level.

The lower electrode 70a may be provided below the water tank 33, and the upper electrode 70b may be provided above the water tank 33.

The drum-type washing machine may further include: a warm air supply path 49 that circulates warm air for drying laundry; and a warm air supply port 51 that is formed above the back of the water tank 33 and introduces warm air into the water tank 33 . The lower electrode 70a may be provided below the water tank 33, and the upper electrode 70b may be provided in a predetermined area from the warm air blowing port 51 in the warm air blowing path 49.

It may also be configured that the resistance between the electrodes 70a and 70b does not fall below a predetermined value during the period when water is supplied by the water supply unit 44 until the water level in the water tank 33 reaches the predetermined water level, and after the predetermined water level is reached, the resistance between the electrodes may be reduced. When the resistance is lower than a predetermined value, the control unit 57 will perform a draining action through the drain valve 43 .

Thereby, the control unit 57 determines that abnormal foaming has occurred, and can perform the cleaning process after temporarily draining the abnormally foaming wash water. Therefore, the drum-type washing machine in this embodiment can distinguish between a short circuit in the foam detection unit 70 and abnormal foaming, and can appropriately handle the abnormal foaming.

During the period when the water supply unit 44 supplies water until the water level in the water tank 33 reaches the predetermined water level, when the resistance between the electrodes is not lower than the predetermined value, the control unit 57 executes the first cleaning program. You may make it so that when it is determined that the electrodes 70a, 70b are short-circuited between the water supply part 44 and the water level in the water tank 33 reaching a predetermined water level, the control part 57 does not perform drainage by the drain valve 43. Instead, at least one of the rotation number and the rotation time of the rotating drum 31 is set to be smaller than the first cleaning program.

Thereby, foaming caused by the stirring of the rotating drum 31 can be suppressed more than in the normal cleaning process. Therefore, the drum-type washing machine in this embodiment can properly handle abnormal foaming even when the foam detection part is short-circuited.

It can also be configured as follows: a display unit 59 is used to notify the status of the washing operation. In addition, when it is determined that the short circuit between the electrodes 70a and 70b is determined, the control unit 57 will use the display unit 59 to perform an abnormality detection after the washing step is completed. notify.

Thereby, the user can recognize that the foam detection part 70 does not function normally. Therefore, by performing the stroke of the washing water tank 33 or the rotating drum 31 itself to remove the deposits accumulated between the electrodes of the foam detection part 70, the short circuit of the foam detection part can be appropriately dealt with. (Other embodiments)

As mentioned above, Embodiment 1 has been described as an example of the technology disclosed in this application, but the technology disclosed in this application is not limited to this.

Therefore, other embodiments are illustrated below.

In the first embodiment, a drum-type washing machine is explained as an example of the washing machine. The washing machine is not limited to a drum-type washing machine as long as it can wash cloth. Therefore, it can also be a vertical washing machine, and it can also be a two-tank washing machine. Furthermore, in Embodiment 1, a drum-type washing machine with a drying function has been described, but a drum-type washing machine without a drying function can also exhibit the same effect. In addition, even if the electrodes are short-circuited due to changes over time, it can still prevent the increase of foam and prevent the cleaning performance from being significantly reduced. Therefore, it is also useful for washing machines and the like that require a protective portion that can protect electrical parts from foam and the like.

In Embodiment 1, as an example of an inner tank, the rotating drum 31 which is arrange|positioned so that the axial direction is inclined downward from the front side to the back side was used and was demonstrated. Since the inner tank only needs to be enclosed in the outer tank and arranged to rotate freely, it can also be arranged in the horizontal direction.

In Embodiment 1, the short-circuit determination is performed based on the change in the resistance value until the water level reaches h2 (S102). However, when the water level in the water tank 33 is equal to or higher than h2 before starting the operation, the aforementioned short circuit determination (S102) does not need to be performed. This is because S101 and S102 cannot be passed in sequence, causing the short circuit determination itself to lack accuracy. In this case, since there is a possibility of abnormal foaming, when the resistance value of the foam detection part 70 is less than the threshold value, it may be quickly entered into the drainage (defoaming process) (S106).

In Embodiment 1, after it is determined that abnormal foaming occurs in S105, the abnormal foaming is treated by draining the water in the water tank 33. The treatment of abnormal foaming is not limited to draining the water in the water tank 33, and can also be dealt with through a cleaning process. For example, during the first weak cleaning process, as long as the resistance value detected by the foam detection unit 70 is above the threshold after a predetermined time (for example, 1 minute), the control unit 57 determines that there is no foam between the electrodes, that is, it has been eliminated. You can also soak it. In addition, it can also be done as follows: returning to the normal cleaning process (S103), if the resistance value detected by the foam detection part 70 is still less than the threshold value, the water in the water tank 33 is drained through the drainage part 43.

In Embodiment 1, the first weak cleaning process is performed in S110. In S110, it may also be configured to enter a second weak cleaning program that is weaker than the first weak cleaning program. Here, the second weak cleaning program refers to, for example, a weaker stirring time in which the rotating drum 31 is rotated for 5 seconds and then stopped for 10 seconds, and is operated at a rotation speed of 30 r/min. The second weak cleaning program can suppress foaming even more because the agitation is weaker than the first weak cleaning program. When the second weak cleaning program is entered, in order to ensure the cleaning power, the second predetermined time (S111) can also be made longer (for example, 20 minutes) than the first predetermined time (S107). Alternatively, the first weak cleaning program may be performed in S103, and the second weak cleaning program may be performed in S110. Here, the second weak cleaning process is also called the third cleaning process.

Moreover, in Embodiment 1, the determination value of the abnormal foaming determination (S105) in the normal cleaning process (S103) and the determination value of the short circuit determination (S109) are set to the same threshold value (for example, 500 kΩ), but they are not Not limited to this. The abnormal foaming determination value may be set to the first threshold (for example, 500 kΩ), and the short circuit determination value may be set to the second threshold (for example, 250 kΩ). Compared with the reduction in the normal resistance value caused by the foaming of the lotion, using a lower resistance value as the basis for short circuit determination can improve the accuracy of short circuit determination.

In addition, in Embodiment 1, the water level h2 is set to the water level corresponding to the height position of the lower end of the rotating drum 31, but it is not limited to this. The water level h2 only needs to be lower than the water level h1 and be a water level that does not cause foaming when the washing water containing detergent components is stirred by the rotation of the rotating drum 31 .

Furthermore, in Embodiment 1, the circulation pump 80 connected to the drainage path 42 is provided, and the circulation path 81 connected to the circulation pump 80 is connected to the circulation port 82 in the front and lower part of the water tank 33, so that the washing step can be completed. The wash water circulates as shown by arrow b. Although the driving of the circulation pump 80 is not described in Embodiment 1, it may be configured as follows. It can also be made as follows: during the normal cleaning procedure (S103), the rotation number or operation rate of the circulation pump 80 is increased (for example, 3500r/min, 30 seconds on-30 seconds off), and during the short circuit determination (S109), in order to suppress the occurrence of Soak and reduce the rotation number or operation rate of the circulation pump 80 (for example, 2500 r/min, 20 seconds on-40 seconds off), or stop it. This can prevent abnormal foaming from being further promoted by driving the circulation pump 80 .

In addition, since the above-described embodiments are for illustrating the technology in the present disclosure, various changes, substitutions, additions, omissions, etc. may be made within the scope of the claims or their equivalent scope.

This disclosure can be applied to washing machines for washing clothes. Specifically, the present disclosure is applicable to vertical washing machines, drum washing machines, two-tank washing machines, etc.

31:Rotating drum 32: water hole 33:Sink 34:Rotation axis 35: Motor 36:Protruding plate 37: Cover 38:Opening part 39: Washing machine body 41: Anti-vibration components 42: Drainage path 43: Drain valve (drainage part) 44: Water supply valve (water supply department) 45:Water supply path 46:Water level detection department 47:Heater 48: Send fan 49: Warm air supply path 51: Warm air supply outlet 57:Control Department 58:Input setting part 59:Display part 70:Foam detection department 70a, 70b: Electrode 80: Circulation pump 81: Circular path 82: Circulation port a, b: arrow A: solid line B: dashed line h1, h2, h3: water level

Fig. 1 is a side cross-sectional view of the drum-type washing machine in Embodiment 1. FIG. 2 is an operation flow chart of the control unit of the drum-type washing machine. FIG. 3 is a schematic diagram illustrating when abnormal foaming occurs in the foam detection part of the drum-type washing machine or when a short circuit occurs due to accumulation. FIG. 4 is a schematic diagram showing the time changes of the resistance value of the foam detection part of the drum-type washing machine and the water level in the water tank.

Claims (9)

A washing machine is provided with: a casing; an outer tank that is elastically supported inside the casing; an inner tank that is enclosed in the outer tank and is configured to rotate freely; a water supply part that supplies water to the outer tank; and a water level detector. The detection part detects the water level in the outer tank; the drainage part drains the water in the outer tank; the foam detection part has a pair of electrodes composed of a first electrode and a second electrode; and a control part controls The washing operation consists of at least one of washing, flushing, and dehydration, and when the resistance between the pair of electrodes is lower than a predetermined value during the period until the water level reaches the predetermined water level, the control unit determines that the Short circuit between opposite electrodes. Such as the washing machine of claim 1, wherein the predetermined water level is equivalent to the height of the lower end of the inner tank. The washing machine of claim 1, wherein the first electrode is disposed at a lower position than the predetermined water level. The washing machine of claim 2, wherein the first electrode is disposed at a lower position than the predetermined water level. The washing machine according to any one of claims 1 to 4, wherein the first electrode is arranged below the outer tank, and the second electrode is arranged above the outer tank. The washing machine according to any one of claims 1 to 4 further includes: a warm air supply path for circulating warm air used to dry the laundry; and a warm air supply outlet formed above the back of the outer tank, and The warm air is introduced into the outer tank, the first electrode is arranged below the outer tank, and the second electrode is arranged in a predetermined area from the warm air supply port in the warm air supply path. The washing machine according to any one of claims 1 to 4, wherein during the period until the water level in the outer tank reaches the predetermined water level, the resistance between the pair of electrodes is not lower than the predetermined value, and, after reaching the predetermined water level, After the predetermined water level, when the resistance between the pair of electrodes is lower than the predetermined value, the control unit will perform a drainage operation through the drainage unit. The washing machine according to any one of claims 1 to 4, wherein during the period until the water level in the outer tank reaches the predetermined water level, when the resistance between the pair of electrodes is not lower than the predetermined value, the control unit The first cleaning program is executed, and when a short circuit between the pair of electrodes is determined during the period until the water level in the outer tank reaches the predetermined water level, the control unit does not perform the drainage operation by the drainage unit. , but executes a second cleaning program in which at least one of the rotation number and the rotation time of the inner tank is set smaller than the first cleaning program. For example, the washing machine according to any one of the requirements 1 to 4 further has: The display part is used to notify the status of the washing operation, and when it is determined that the short circuit between the pair of electrodes is determined, the control part will notify the abnormality through the display part after the washing operation is completed.