JP2004357797A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress an erroneous recognition of the liquid volume of a washing vessel as abnormal one due to discharge of bubbles of detergent from a liquid discharge part. <P>SOLUTION: The dish washer is provided with the washing vessel 12 storing the liquid, the liquid discharge part 64 introducing the liquid in the washing vessel 12 and, when the liquid volume in the washing vessel 12 reaches a predetermined volume or more, discharging the liquid introduced from the washing vessel 12, and a liquid detecting part 68 detecting the liquid discharged from the liquid discharge part 64. The liquid discharge part 64 is provided with a trap part 66 capable of accumulating and sealing the liquid. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD The present invention relates to a dishwasher.
[0002]
2. Description of the Related Art Generally, in a dishwasher, dishes are washed by applying jetted water to the dishes. If the water to be sprayed contains bubbles, the force of the water to be sprayed is reduced, and as a result, the washing power of the tableware may be reduced. For this reason, dishwashers are generally required to use a special detergent that suppresses foaming. However, in reality, a detergent with excellent foaming (such as a neutral detergent for kitchen) may be used in a dishwasher. In this case, a large amount of bubbles may be generated in the cleaning tank.
[0003]
By the way, for example, it is assumed that a water supply valve in the middle of a water supply pipe for supplying water to the cleaning tank remains open although it should be closed. In this case, if no countermeasures are taken, the amount of water in the washing tank rises, so that water overflows from an undesired position in the washing tank. As a countermeasure to this, there is a dishwasher provided with an overflow discharge pipe connected to a washing tank and an overflow detection switch capable of detecting water discharged from the overflow discharge pipe. According to this, an abnormality in the amount of water in the cleaning tank can be recognized.
[0004]
However, in this dishwasher, when a dishwashing machine uses a highly foaming detergent and a large amount of foam is generated in the washing tank, the foam passes through the overflow discharge section. Was discharged and was detected by the overflow detection switch. In this case, even though the actual amount of water in the washing tank is normal, there is an irrational situation in which bubbles are discharged from the overflow discharge unit, and the amount of water in the washing tank is erroneously recognized as abnormal. Will happen.
[0005]
In addition, in the conventional dishwasher, it is generally not preferable to use a detergent having a good foaming property. Sometimes you want to be abnormal. However, even if bubbles exist, it is often not necessary to make them abnormal. There is also a case where it is desired to distinguish and detect an abnormality caused by the presence of a large amount of bubbles and an abnormality in the amount of water in the washing tank.
[0006]
An object of the present invention is to suppress that the amount of liquid in the cleaning tank is erroneously recognized as being abnormal due to the discharge of bubbles from the liquid discharge unit.
[0007]
According to one aspect of the present invention, there is provided a dishwasher comprising: a washing tank capable of storing a liquid; a liquid in the washing tank being introduced; A liquid discharge unit for discharging the liquid introduced from the cleaning tank when the amount of the liquid becomes a predetermined amount or more, and a liquid detection unit capable of detecting the liquid discharged from the liquid discharge unit. The liquid discharge section is provided with a trap section capable of storing and sealing a liquid.
[0008]
The trap section is usually provided in a drain pipe, but this embodiment is characterized in that a trap section is provided in the liquid discharge section of the dishwasher. According to this aspect, even when a large amount of foam is generated in the cleaning tank using a detergent with excellent foaming, the foam is guarded by the liquid sealing the trap portion. Therefore, it is possible to suppress the bubbles from being discharged from the liquid discharge unit. For this reason, it can suppress that the liquid detection part detects the bubble. Accordingly, it is possible to prevent the liquid amount in the cleaning tank from being erroneously recognized as being abnormal.
As described above, when the trap section is provided in the liquid discharge section, an operation and effect unique to the dishwasher can be obtained.
[0009]
Supplying the liquid into the liquid discharge unit to allow the liquid to flow out of the liquid discharge unit, than the minimum first liquid amount that needs to be supplied into the liquid discharge unit to seal the trap unit with liquid; It is preferable that the minimum second liquid amount required is larger.
According to this aspect, the liquid can be stored in the trap section by supplying the liquid to the liquid discharge section that is equal to or more than the first liquid amount and less than the second liquid amount, and the liquid is discharged from the liquid discharge section. It is possible to prevent detection by the detection unit.
[0010]
The liquid in the liquid outlet may exceed the height of the barrier required for the liquid in the liquid outlet to exceed the liquid in the liquid outlet to seal the trap portion. It is preferable that the height of the barrier portion necessary for the above is made higher.
[0011]
It is preferable that the trap portion forms a substantially U-shaped or substantially V-shaped liquid passage.
[0012]
A nozzle provided in the cleaning tank, a cleaning pump for supplying a liquid to the nozzle, and a control unit, wherein the control unit stores the liquid in the cleaning tank so as to store the liquid in the trap unit. It is preferable to execute a process of supplying the cleaning pump, and then execute a process of operating the cleaning pump.
If such a control unit is provided, the liquid can be reliably stored in the trap unit before the cleaning pump is operated to generate bubbles in the cleaning tank.
[0013]
A nozzle provided in the cleaning tank, a cleaning pump for supplying a liquid to the nozzle, and a control unit, wherein the control unit controls the liquid discharge unit to output the second liquid at the first liquid amount or more. It is preferable to execute a process of supplying a liquid to the cleaning tank so that a liquid less than the liquid amount is supplied, and then execute a process of operating the cleaning pump.
When such a control unit is provided, the liquid can be reliably stored in the trap unit before the cleaning pump is operated to generate bubbles in the cleaning tank, and the liquid discharge unit is used to store the liquid. It is possible to reliably prevent the liquid from flowing out.
[0014]
It is preferable that the apparatus further comprises a drain pump and a drain pipe through which the liquid in the washing tank pumped by the drain pump passes, and the liquid passing through the drain pipe is preferably introduced into the trap section.
According to this aspect, the liquid stored in the trap portion can be replaced by the liquid passing through the drain pipe.
[0015]
It is preferable that the liquid passing through the drain pipe is configured to be introduced toward a downstream side of the trap section.
According to this aspect, it is possible to more effectively prevent the bubbles from being discharged from the liquid discharge unit.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment FIG. 1 is a schematic sectional view of a dishwasher according to a first embodiment. In this dishwasher, an outer frame is formed by the washer body 10. A cleaning tank 12 is housed inside the cleaning machine body 10. On the front side (left side in FIG. 1) of the cleaning tank 12, a door 34 is attached. A power switch 28 and a start / pause switch 30 are provided above the door 34. These switches 28 and 30 are electrically connected to the control unit 32. The control unit 32 controls the operation of each unit of the dishwasher. The top of the cleaning tank 12 is open. The opening is closed by the inner lid 16 when the washing tank 12 is completely accommodated in the washing machine main body 10. The inner lid 16 is attached to the cleaning machine main body 10 via a link mechanism (not shown). When the door 34 is pulled out to the near side (the left side in FIG. 1), the inner lid 16 is moved upward by the link mechanism, and the cleaning tank 12 is drawn out.
[0017]
A dish basket 36 is housed inside the washing tank 12. The dish basket 36 is removable. The tableware basket 36 is configured by arranging bars in a grid. In the tableware basket 36, tableware 22 such as a plate, a bowl, a cup, or the like can be placed. In addition, a chopstick, a spoon, or the like can be placed in the small basket 20 of the tableware basket 36. The small basket 20 is provided with a detergent container 18.
[0018]
An opening 12 a in the middle part on the back surface of the cleaning tank 12 is connected to one end of the water supply pipe 11. A water supply valve 84 is provided in the water supply pipe 11. The other end 11a of the water supply pipe 11 is connected to a water supply source 82 outside the dishwasher. The lower opening 12 b of the back surface of the cleaning tank 12 is connected to one end of the air vent tube 78. The other end of the air vent tube 78 is connected to an air vent 80.
[0019]
An opening 49 is formed at the bottom of the cleaning tank 12. A water reservoir 52 is provided below the opening 49. A garbage filter 48 is provided near the opening 49 (the top of the water reservoir 52). The garbage filter 48 is removable.
[0020]
One end of a first pipe 54, a second pipe 55, a third pipe 56, and a fourth pipe 57 are connected to the water reservoir 52. A cleaning pump 59 is provided in the middle of the first pipe 54. The other end 54 a of the first pipe 54 reaches the inside of the cleaning tank 12. A rotating nozzle 58 is attached to the other end 54 a of the first pipe 54. The rotating nozzle 58 is located below the tableware basket 36. The rotary nozzle 58 is rotatable around an axis extending in the vertical direction. A heater 42 is provided at the bottom of the cleaning tank 12. The heater 42 is covered with a heater cover 40. A thermistor 50 is attached to the back of the bottom surface of the cleaning tank 12.
[0021]
A water level detection case 62 is attached to the other end of the second pipe 55. In the water level detection case 62, a float 60 is arranged. Above the float 60, a water level detection switch 88 is provided. The water level detection switch 88 is electrically connected to the control unit 32.
[0022]
As shown in FIG. 2, the other end of the third pipe 56 is connected to an inlet 64 a of the overflow discharge case 64. The outlet 64b of the overflow discharge case 64 is open. The overflow discharge case 64 has an outer frame case 90 and partition walls 92, 94, and 96. The partition walls are arranged in parallel in the order of a first partition wall 92, a second partition wall 94, and a third partition wall 96 at intervals. The first partition wall 92 and the third partition wall 96 extend upward from the bottom surface of the outer frame case 90. The second partition wall 94 extends downward from the top surface of the outer frame case 90. The height H1 of the first partition wall 92 and the height H3 of the third partition wall 96 are higher than the height H2 of the lower end of the second partition wall 94. These partition walls 92, 94, 96 form a U-shaped liquid passage 66. This is the trap section 66.
[0023]
Further, the third partition wall 96 is higher than the first partition wall 92. The first partition wall 92 is a barrier necessary for the water in the overflow discharge case 64 to exceed the water in order to seal the trap portion 66 with water. The third partition wall 96 is a barrier necessary for the water in the overflow discharge case 64 to exceed the water in order to allow the water to flow out of the overflow discharge case 64. With this configuration, the overflow discharge case 64 is used to discharge water from the overflow discharge case 64, rather than the minimum amount of water that needs to be supplied into the overflow discharge case 64 to seal the trap section 66 with water. The minimum amount of water that needs to be supplied into the case 64 is larger.
[0024]
As shown in FIG. 1, a drain pump 76, an air vent 80, a drain trap 70, and a drain check valve 72 are provided in the middle of the fourth pipe (drain pipe) 57. The other end 57a of the fourth pipe 57 is connected to a drain 74 outside the dishwasher.
[0025]
A flood detection switch (detection electrode pair) 68 is provided at a position below the outlet portion 64b (see FIG. 2) of the overflow discharge case 64 and adjacent to the front side of the bottom surface 10a of the cleaning machine body 10. I have. When water comes into contact with the tip of the pair of electrodes constituting the switch 68, conduction between the pair of electrodes is established. As a result, an electric signal is sent from the switch 68 to the control unit 32. A drying fan 46 is provided at a position adjacent to the back side of the front bottom surface of the cleaning tank 12. The drying fan 46 is located at one end of the air passage 44. The other end of the air passage 44 is connected to the opening 12 c on the front surface of the cleaning tank 12. The air passage 44 is partitioned by the wall 38. The height H3 of the third partition wall 96 of the overflow discharge case 64 shown in FIG. 2 is lower than the height H5 of the wall 38 partitioning the air passage 44 shown in FIG.
[0026]
Next, the operation of the dishwasher will be described. The dishwasher operates in the order of a water supply step, a washing step, a rinsing step, and a drying step after a user performs a preparation step. In addition, in the cleaning step and the rinsing step, in detail, processes such as water supply, cleaning, and drainage are repeatedly performed in a predetermined pattern.
[0027]
(Preparation Step) The cleaning tub 12 is pulled out by pulling the door 34 shown in FIG. 1 forward (to the left in FIG. 1), and the tableware 22 is placed in the tableware basket 36. Further, the detergent is put into the detergent container 18 attached to the small basket 20 of the tableware basket 36. It is assumed that an excellent lathering detergent (a neutral detergent for kitchen or the like) is used as the detergent. Next, the door 34 is pushed backward (to the right in FIG. 1), and the cleaning tank 12 is housed in the main body 10 of the cleaning machine. Next, when the power switch 28 is turned on, a predetermined course is selected, and the start / pause switch 30 is turned on, the operation is started.
[0028]
(Water Supply Step) When the operation is started, the control unit 32 opens the water supply valve 84. Then, water is supplied from the water supply source 82 into the cleaning tank 12 through the water supply pipe 11. When the water supply is continued, the float 60 in the water level detection case 62 rises. When the water level in the washing tank 12 reaches a predetermined water level and the upper end of the float 60 hits the water level detection switch 88, the water level detection switch 88 is turned on. Then, the detection signal is sent to the control unit 32. As a result, the control unit 32 closes the water supply valve 84. Thereby, the water supply step ends.
[0029]
The water level (initial water level) supplied to the washing tank 12 in the water supply step and introduced into the overflow discharge case 64 as a result is equal to or higher than the height H1 of the first partition wall 92 shown in FIG. The height is set to be less than the height H3 of the wall 96. Thereby, as schematically shown in FIG. 3, the water W can be stored in the trap portion 66 without discharging the water from the outlet portion 64b of the overflow discharge case 64.
[0030]
Here, it is assumed that the water supply valve 84 shown in FIG. 1 has failed and the water supply valve 84 has not been closed even when the control unit 32 performs the process of closing the water supply valve 84. Alternatively, it is assumed that the float 60 has failed and the water level in the water level detection case 62 has risen, but the float 60 has not risen and the water level detection switch 88 has not been turned on. In this case, the water level in the cleaning tank 12 rises higher than normal. As a result, the water level of the overflow discharge case 64 also rises, the water level exceeds the height H3 of the third partition wall 96 (see FIG. 2), and water is discharged from the overflow discharge case 64.
[0031]
When this water comes into contact with the overflow detection switch 68 and is detected, the switch 68 outputs a detection signal. This detection signal is sent to the control unit 32. The control unit 32 that has received the detection signal operates the drain pump 76. As a result, the water in the water reservoir 52 (the cleaning tank 12) is guided to the drain 74 outside the dishwasher through the fourth pipe 57. As a result, the water in the cleaning tank 12 is drained. With this configuration, it is possible to prevent the water in the cleaning tank 12 from flowing out of the air passage 44 beyond the wall 38 partitioning the air passage 44. Further, when receiving the detection signal, the control unit 32 sounds a buzzer for notifying the abnormality, and displays that the abnormality has occurred on a display unit (not shown) provided on the door 34.
However, in the present embodiment, it is assumed that such an abnormality has not occurred.
[0032]
(Washing Step) When the water supply step is completed, the control unit 32 drives the washing pump 59 and energizes the heater 42. When the cleaning pump 59 is driven, water in the water reservoir 52 (the cleaning tank 12) is guided to the rotary nozzle 58 through the first pipe 54. This water is injected into the cleaning tank 12 from the rotating nozzle 58. The tableware 22 is washed by the jet water hitting the tableware 22 in the washing tank 12. The water injected into the cleaning tank 12 is stored again in the water reservoir 52 (the cleaning tank 12). This water is guided again to the rotary nozzle 58 by the cleaning pump 59 and is jetted. The tableware 22 is washed by such a circulation action. Further, when the heater 42 is energized to warm the water, warm water can be applied to the tableware 22, so that the cleaning ability is increased. The control unit 32 controls on / off of the output of the heater 42 according to the output of the thermistor 50.
[0033]
After driving the cleaning pump 59 for a predetermined time, the control unit 32 stops the driving. Next, the control unit 32 operates the drain pump 76. As a result, the water in the water reservoir 52 (the cleaning tank 12) is guided to the drain 74 outside the dishwasher through the fourth pipe 57. As a result, the water in the cleaning tank 12 is drained.
[0034]
As described above, when a detergent having excellent foaming is used, such a cleaning operation generates a large amount of foam in the cleaning tank 12 (water reservoir 52). The foam may reach the overflow discharge case 64 through the third pipe 56.
However, in this embodiment, the trap portion 66 is provided in the overflow discharge case 64, and as shown in FIG. 3, the trap portion 66 stores water W in a water supply step and is sealed with water. Therefore, as shown in FIG. 4, the bubble B that has reached the overflow discharge case 64 through the third pipe 56 is guarded by the water W that seals the trap portion 66. Therefore, even if a large amount of foam is generated in the cleaning tank 12 (water reservoir 52), it is possible to prevent the foam from flowing out of the overflow discharge case 64 and being detected by the overflow detection switch 68. Therefore, even though the amount of water in the cleaning tank 12 is normal, it is possible to prevent the fact that the amount of water in the cleaning tank 12 is erroneously recognized as being abnormal by detecting the bubbles with the overflow detection switch 68.
[0035]
(Rinse Step) When the cleaning step is completed, the control unit 32 opens the water supply valve 84 again to supply water into the cleaning tank 12. Further, the control unit 32 operates the cleaning pump 59. Thereby, the supplied water is injected into the cleaning tank 12 from the rotating nozzle 58. Next, the control unit 32 operates the drain pump 76 to discharge the water in the water reservoir 52 (the cleaning tank 12) after rinsing to the drain 74. The above rinsing process is repeated a plurality of times.
[0036]
In a conventional dishwasher, a large amount of foam generated in the washing tank by the washing process is pushed to the overflow outlet by water supply during the subsequent rinsing process, and as a result, the foam flows out of the overflow outlet. There was a problem.
On the other hand, according to the dishwasher of the present embodiment, since the above-described trap portion 66 is provided in the overflow discharge case 64, the foam flows out of the overflow discharge case 64 even in the above case. Can be effectively prevented.
[0037]
(Drying Step) When the rinsing step is completed, the control unit 32 rotates the drying fan 46. As a result, external air is introduced into the cleaning tank 12 through the air passage 44. The air introduced into the cleaning tank 12 is heated by the heater 42. The tableware 22 in the washing tank 12 is dried by the heated air.
[0038]
Second Embodiment FIG. 5 is a schematic sectional view of a dishwasher according to a second embodiment. In the second embodiment, an inlet 64 a (see FIG. 2) of the overflow discharge case 64 is connected to an opening 62 a at the lower end of the water level detection case 62. In this point, as shown in FIG. 1, the inlet 64a (see FIG. 2) of the overflow discharge case 64 is different from the first embodiment in which the inlet 64a is connected to the water reservoir 52 through the third pipe 56. As in the first embodiment, the trap portion 66 of the overflow discharge case 64 stores water in a water supply step and is sealed with water.
[0039]
When a large amount of foam is generated in the cleaning tank 12 (water reservoir 52) by using a highly foaming detergent, the foam may reach the water level detection case 62 through the second pipe 55. When the overflow detecting section is connected to the water level detecting case 62, the bubbles may flow out of the overflow detecting section depending on the structure of the overflow detecting section. In this case, the overflow detection switch 68 detects bubbles. As a result, even if the amount of water in the cleaning tank 12 is actually normal, it is erroneously recognized as abnormal.
[0040]
On the other hand, in the second embodiment, similarly to the first embodiment, a trap section 66 is provided in an overflow discharge case 64 connected to the water level detection case 62. Therefore, similarly to the first embodiment, it is possible to prevent bubbles from flowing out from the overflow discharge case 64.
[0041]
Third Embodiment FIG. 6 is a schematic sectional view of a dishwasher according to a third embodiment. In the third embodiment, a part in the middle of the drain pipe 57 (specifically, the air vent part 80) and a part of the overflow discharge case 64 located above the trap part 66 are connected by a pipe 89. As a result, water passing through the drain pipe 57 is introduced into the trap section 66. More specifically, the pipe 89 is connected to a portion of the overflow discharge case 64 located above the downstream side of the trap section 66 (the right half side of the trap section 66 in FIG. 1). Thus, the water passing through the drain pipe 57 is introduced toward the downstream side of the trap section 66.
[0042]
The water in the trap section 66 has a role of guarding the bubbles as described above, and is likely to touch the bubbles. The foam contains a detergent (typically, an organic surfactant) as a constituent. Therefore, when the bubbles come into contact with the water in the trap portion 66, the detergent components are contained in the water. Further, other impurities may be included in the water of the trap section 66 in some cases. As a result, if the water in the trap section 66 is left for a long time without being replaced, there is a risk of decay. In addition, it may cause a bad smell.
[0043]
On the other hand, according to the present embodiment, when the drain pump 76 is driven and water flows into the drain pipe 57, the water is introduced into the trap section 66. Therefore, the water in the trap 66 can be replaced each time water passes through the drain pipe 57. Water in the latter stage of the rinsing step and the water in the washing step has a low content of detergents and the like. Therefore, by replacing the water in the trap section 66 with such water, the trap section 66 can be kept hygienic. Further, generation of offensive odor can also be prevented.
[0044]
Further, as in the present embodiment, when the water passing through the drain pipe 57 is introduced toward the downstream side of the trap section 66, the water stored in the trap section 66 is pushed back to the upstream side of the overflow discharge case 64. . Therefore, in this case, if bubbles exist upstream of the overflow discharge case 64, the bubbles are also pushed back. For this reason, the discharge of bubbles from the overflow discharge case 64 can be more effectively suppressed.
[0045]
Further, in the present embodiment, there is no air vent pipe 78 (see FIG. 1) connected to the cleaning tank 12 as in the first embodiment. However, since the outlet of the overflow discharge case 64 is open to the atmosphere, the pipe 89 connected to the overflow discharge case 64 also serves as an air vent pipe. Therefore, the occurrence of the so-called siphon phenomenon can be prevented even without the air vent tube 78 as in the first embodiment.
[0046]
(Other Examples of Liquid Discharge Portion) Instead of the overflow discharge case 64 of the first embodiment or the like, an overflow discharge pipe 100 as shown in FIG. 7 may be used. As in the first embodiment, the inlet 100a of the overflow pipe 100 may be connected to the other end of the third pipe 56 shown in FIG. Further, as in the second embodiment, the inlet portion 100a of the overflow pipe 100 may be connected to the opening 62a of the water level detection case 62 shown in FIG. The overflow discharge pipe 100 has a U-shaped liquid passage 102 formed therein. This is the trap section 102.
[0047]
The lower end of the pipe section 104 of the overflow discharge pipe 100 has a height H1. The lower end of the tube 106 has a height H3. The height H3 is higher than the height H1. The lower end of the pipe portion 104 is a barrier necessary for the water in the overflow discharge pipe 100 to overflow to seal the trap portion 102 with water. On the other hand, the lower end of the pipe portion 106 is a barrier necessary for the water in the overflow discharge pipe 100 to flow over the outlet 100b of the overflow discharge pipe 100.
[0048]
As mentioned above, although the specific example of this invention was demonstrated in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and alterations of the specific examples illustrated above.
In the above embodiment, the case where the trap portion is U-shaped is taken as an example, but the configuration of the trap portion is not limited. The trap portion may be V-shaped or another shape.
[0049]
Further, the technical elements described in the present specification or the drawings exert technical utility singly or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technology illustrated in the present specification or the drawings can simultaneously achieve a plurality of objects, and has technical utility by achieving one of the objects.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view of a dishwasher according to a first embodiment.
FIG. 2 is an explanatory view of a flood discharge case which is an example of a liquid discharge section (1).
FIG. 3 is an explanatory view of a flood discharge case which is an example of a liquid discharge section (2).
FIG. 4 is an explanatory view of a flood discharge case which is an example of a liquid discharge section (3).
FIG. 5 is a schematic sectional view of a dishwasher according to a second embodiment.
FIG. 6 is a schematic sectional view of a dishwasher according to a third embodiment.
FIG. 7 shows a configuration diagram of a flood discharge pipe as another example of the liquid discharge section.
[Explanation of symbols]
10: Cleaning machine body 12: Cleaning tank 52: Water reservoir 62: Water level detection case 64: Overflow discharge case 66: Trap unit

Claims (5)

A cleaning tank capable of storing a liquid, and a liquid discharge unit configured to introduce the liquid in the cleaning tank and discharge the liquid introduced from the cleaning tank when the amount of the liquid in the cleaning tank is equal to or more than a predetermined amount. A liquid detection unit capable of detecting the liquid discharged from the liquid discharge unit,
A dishwasher, wherein a trap portion capable of storing and sealing a liquid is provided in the liquid discharge portion. Supplying the liquid into the liquid discharge unit to allow the liquid to flow out of the liquid discharge unit, than the minimum first liquid amount that needs to be supplied into the liquid discharge unit to seal the trap unit with liquid; The dishwasher according to claim 1, wherein the minimum required second liquid amount is configured to be larger. A nozzle provided in the cleaning tank, a cleaning pump for supplying a liquid to the nozzle, and a control unit,
The said control part performs the process which supplies a liquid to the said washing tank so that a liquid may be stored in the said trap part, and after that, performs the process which operates the said washing pump, The Claims characterized by the above-mentioned. Dishwasher. A nozzle provided in the cleaning tank, a cleaning pump for supplying a liquid to the nozzle, and a control unit,
The control unit executes a process of supplying a liquid to the cleaning tank such that a liquid that is equal to or more than the first liquid amount and less than the second liquid amount is supplied to the liquid discharge unit. The dishwasher according to claim 2, wherein a process for operating the dishwasher is performed. A drainage pump, further comprising a drainage pipe through which the liquid in the washing tank pumped by the drainage pump passes;
The dishwasher according to any one of claims 1 to 4, wherein the liquid passing through the drain pipe is configured to be introduced into the trap section.

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