JP2006192006A - Dishwasher - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate the risk of executing a dishwashing operation using old water in which bacteria have grown in the case that time elapses without executing the operation after water is poured into a water supply tank. <P>SOLUTION: The presence/absence of water inside a water supply tank is judged after power is supplied (S11, S12), and in the case that there is stored water, its water temperature T1 and an atmosphere temperature T2 are detected (13, S14), and it is judged that the stored water is old when the temperature difference ΔT is ≤a stipulated value Ta (S15, S16). In this case, a user is alarmed (S17), and the stored water inside the water supply tank is abandoned to the outside of a machine when a water discharge key is operated within prescribed time after the alarm (S18-S23). In the case of judging that the stored water is new, the alarm is not issued, the reception of a power switch is waited for and operation start is made possible. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a dishwasher that performs washing by spraying water onto dishes stored in a washing cabinet, and more particularly to a dishwasher that includes a water supply tank for preliminarily storing water used for easy washing. .

  A household dishwasher supplies water to a washing cabinet containing dishes, stores the water at the bottom of the washing cabinet, sucks the water with a washing pump, and pumps it to the nozzle arm. It has the structure which wash | cleans and rinses tableware by injecting water to the tableware from the provided water injection hole. When installing such a dishwasher in a kitchen of a general household, a branch faucet is usually attached to the pipe on the upstream side of the tap on the tap installed in the sink of the kitchen. Installation work that connects the main body with a water supply hose is required. However, for example, in rental housing, the installation work of such a faucet may be difficult or not permitted, and there is a problem that it is impossible to use a dishwasher.

  Therefore, there has been a demand from the market for a dishwasher of a branch faucet-less type that does not require a branch faucet installation work. As such a dishwasher, for example, as described in Patent Document 1, a dishwasher including a water supply tank for storing in advance water required for washing operation and rinsing operation has been conventionally known. In this dishwasher, the user injects the required amount of water into the water supply tank prior to operation, and when the operation is started, the dishwasher body uses the water in the water supply tank to perform all operations. Execute.

  In recent years, due to growing interest in environmental issues and energy savings, it has been desired to reduce the standby power consumption of various types of electrical equipment as much as possible, to zero if possible, and a long time when not in use There are many similar requests. In a dishwasher with zero standby power consumption, no power is supplied to the control unit, which is mainly composed of the CPU, when the power is turned off, and the operation of the control unit is completely stopped. Therefore, in a dishwasher equipped with a water supply tank as described above, when the user pours water into the water supply tank when the power is off, the water is stored in the water supply tank after the power is turned on next time. However, it is not possible to know when water has been injected.

  Even in dishwashers where the control unit is always energized when the power plug is inserted into a commercial AC power outlet instead of zero standby power consumption, the user can plug in the power plug when not in use to save power. Often you unplug from the power outlet. If water is poured into the water supply tank when the power plug is disconnected from the outlet, that is, when power is not supplied to the control unit, the power supply tank is inserted into the water supply tank after the power plug is inserted into the outlet next time. It is possible to detect that water has been stored, but it is not possible to know when water has been injected. This is the same as a dishwasher with zero standby power consumption.

  For example, if the user poured water into the water tank with the intention of washing dishes several days ago, but did not actually drive and drain, the water poured into the water tank a few days ago Is left as it is. In such a case, harmful germs may be propagated in the water in the water supply tank. Therefore, it is desirable to avoid hygiene to use such water for dishwashing, especially the final rinse operation. However, in order to avoid such a risk, if the control is performed such that all the water stored in the water supply tank is forcibly discarded when the power is turned on or when the power supply to the control unit is restored, Water that has been poured in immediately before the user turns on the power or just before the power plug is inserted into the outlet will be discarded, and the water that has been poured will be wasted. In addition, in order to avoid such waste of water, water should be injected into the water supply tank after the power is turned on or when the power plug is inserted into the outlet, that is, when it is possible to detect the presence or absence of water in the water supply tank. It may be possible to have the user thoroughly, but imposing such usage conditions on the user may deteriorate usability.

JP 2003-180596 A

  The present invention has been made in view of the above problems, and in a dishwasher equipped with a water supply tank for preliminarily storing water used for washing operation and rinsing operation, the cleanliness of the water used is ensured. At the same time, the purpose is not to waste water as much as possible and to improve usability.

The dishwasher according to the first aspect of the present invention, which has been made to solve the above-mentioned problems, is a dishwasher in which the dishware is housed, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and the water is moved from the water supply tank into the cleaning container. In a dishwasher that performs washing and rinsing operations,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
A time lapse estimation means for estimating whether or not a long time has elapsed since the water was poured into the water supply tank when it is determined by the confirmation means that there is stored water;
Informing means for informing the user based on the estimation result by the time lapse estimating means,
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
It is characterized by having.

A dishwasher according to a second aspect of the invention made to solve the above-described problems is a dishwasher according to a second aspect of the present invention, in which dishware is accommodated inside, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and the water is moved from the water supply tank into the cleaning container. In a dishwasher that performs washing and rinsing operations,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
A time lapse estimation means for estimating whether or not a long time has elapsed since the water was poured into the water supply tank when it is determined by the confirmation means that there is stored water;
A forced drainage means for discharging the stored water in the water supply tank to the outside when it is determined by the time lapse estimation means that the stored water has passed for a long time;
It is characterized by having.

A dishwasher according to a third aspect of the present invention for solving the above-mentioned problems is a dishwasher in which dishware is accommodated inside, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and the water is moved from the water supply tank into the cleaning container. In a dishwasher that performs washing and rinsing operations,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
Notification means for notifying the user of the result of confirmation by the confirmation means;
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
It is characterized by having.

A dishwasher according to a fourth aspect of the present invention made to solve the above-mentioned problems is a dishwasher in which dishware is accommodated inside, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and the water is moved from the water supply tank into the cleaning container. In a dishwasher that performs washing and rinsing operations,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
Forcibly draining means for discharging the stored water in the water supply tank to the outside when the confirmation means determines that there is stored water;
It is characterized by having.

A dishwasher according to a fifth aspect of the present invention, which has been made to solve the above-mentioned problems, is a dishwasher in which dishware is housed, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and water is poured into the water supply tank from an external water tap In a dishwasher that temporarily stores water, moves the stored water from the water supply tank into the washing cabinet, and performs washing and rinsing operations.
Detecting means for detecting whether or not the water level of the stored water in the water supply tank has reached a predetermined water level;
Water injection time acquisition means for measuring or estimating the water injection time until the predetermined water level is reached by the detection means at the time of water injection to the water supply tank after turning on the power;
When the water injection time is short, notifying means for notifying the user that warning water has already been stored in the water supply tank before water injection;
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
It is characterized by having.

A dishwasher according to a sixth aspect of the present invention for solving the above-mentioned problems is a dishwasher in which dishware is accommodated inside, and the water stored in the bottom of the dishwasher is sucked and sprayed toward the dishware. And a water supply tank for storing an amount of water necessary for operation outside the cleaning container, and water is poured into the water supply tank from an external water tap In a dishwasher that temporarily stores water, moves the stored water from the water supply tank into the washing cabinet, and performs washing and rinsing operations.
Detecting means for detecting whether or not the water level of the stored water in the water supply tank has reached a predetermined water level;
Water injection time acquisition means for measuring or estimating the water injection time until the predetermined water level is reached by the detection means at the time of water injection to the water supply tank after turning on the power;
When the water injection time is short, it is assumed that there is already stored water in the water supply tank before water injection, forced drainage means for discharging the stored water in the water supply tank outside the machine,
It is characterized by having.

  In the dishwasher according to any one of the first to sixth inventions, various states can be considered as “power-on”. For example, as one aspect of the dishwasher according to the first to sixth inventions, each means is always operable when AC power is supplied from a commercial AC power source, and supply of the AC power is started. Sometimes power can be turned on.

  As another aspect, each means can always operate when AC power is supplied from a commercial AC power supply, and includes an operation unit that apparently turns on and off the power supply in response to an operation by the user. The power may be turned on when the power-on operation of the operation unit is performed.

  As still another aspect, an operation unit that turns on / off the power upon receiving an operation by the user, and an auto power-off unit that automatically turns off the power even if there is no power-off operation by the operation unit at the end of operation The power supply to each of the means is stopped when the power is turned off, and the power can be turned on when a power-on operation of the operation unit is performed.

  In the dishwasher according to the first aspect of the present invention, for example, when the power of the dishwasher is turned on, for example, by operating a power switch as the operation unit, the confirmation means first confirms the presence or absence of water stored in the water supply tank by the detection means . When it is determined that there is stored water in the water supply tank, the time lapse estimation means simply determines whether or not a certain long time has passed since the stored water was stored in the water supply tank. In other words, it is estimated whether it is old water or new water. If it is estimated that the water is old, a long time has passed since the injection, there may be sanitary problems such as the propagation of various germs. Is notified to the user. As the notification means, for example, visual notification by lighting or blinking of the display, audible notification by sounding a buzzer, or a combination of both can be considered. By this notification, the user can recognize that water remains in the water supply tank.

  When the user determines that the water in the water supply tank is really old, such as when water has not been poured into the water supply tank immediately before that, for example, to perform drainage such as performing a predetermined key operation. Perform the operation. In response to the operation by the user, the forced drainage means discharges the water accumulated in the water supply tank to the outside of the apparatus, and makes the water supply tank almost empty. Therefore, by injecting water from the tap into the water supply tank and instructing the start of the dishwashing operation, new water that has just been supplied from the tap without using old water that has passed for a long time in the water supply tank. Can be used to perform dishwashing. On the other hand, when the user determines that the water in the water supply tank is new, such as when water is supplied to the water supply tank immediately before the power is turned on, the predetermined value as described above is provided after the notification by the notification means. If the above operation is not performed, the stored water in the water supply tank is not discarded, and dishwashing can be executed as it is or by adding water injection into the water supply tank.

  As described above, according to the dishwasher according to the first aspect of the present invention, for example, when water that has been previously poured remains in the water supply tank, such as several days ago, the user is notified by the notification that is made when the power is turned on. As a result, the user simply performs a simple operation such as pressing the drain key, discarding the unsanitary water in the water supply tank and using fresh water to clean the dishwasher. can do. Thereby, hygienic dishwashing can always be performed. On the other hand, when water is poured into the water supply tank just before the power is turned on for dishwashing, the notification by the notification means is not made, or even if the notification is made by mistake, the user's judgment is once asked. For example, by performing a normal operation such as setting an operation course or the like and pressing a start key, operation using the water can be performed without wasting water. In addition, since the user can inject water into the water supply tank without worrying about whether it is before the power is turned on or after the power is turned on, the usability is also good.

  In the dishwasher according to the second invention, similarly to the dishwasher according to the first invention, when it is determined by the checking means that there is stored water in the water supply tank, the time lapse estimating means uses old water as the stored water. Estimate whether there is new water. However, when it is estimated that this stored water is old water that has passed for a long time since water injection, the forced drainage means discharges the water stored in the water supply tank to the outside without asking the user's judgment. And make the water tank almost empty. Therefore, if the time lapse estimation means makes a mistake, there is a possibility that the water will be discarded even though it is new water poured just before the power is turned on. On the other hand, if there is a possibility that the stored water in the water supply tank is old water, drainage is performed without bothering the user. For example, the user temporarily leaves the dishwasher. Even in such a case, the old water can be automatically drained and housework can be carried out efficiently, and clean water can be cleaned using freshly poured clean water.

In addition, as a specific aspect of the dishwasher according to the first and second inventions, the time lapse estimation means includes:
Water temperature detecting means for detecting the water temperature of the stored water in the water tank;
An ambient temperature detection means for detecting the ambient ambient temperature;
A process of calculating a temperature difference between the water temperature and the atmospheric temperature, and determining that a long time has elapsed since the water was poured into the water supply tank when the temperature difference is a predetermined value or less. Means,
It can be set as the structure provided with.

  That is, generally, the temperature (water temperature) of tap water supplied from a tap is relatively constant throughout the year, but the ambient temperature (air temperature) varies greatly depending on the season. Therefore, except for temporary periods such as spring and autumn, when the water just supplied from tap water is stored in the water supply tank, the temperature difference between the water temperature and the ambient temperature is large, As the time during which water is stored increases, the water temperature approaches the ambient temperature and the temperature difference decreases. Therefore, when the temperature difference between the water temperature and the ambient temperature is equal to or less than a predetermined value, the processing means determines that the stored water has passed for a long time since the water was poured into the water supply tank. Thereby, it is possible to estimate with a very high accuracy whether the stored water in the water supply tank is old or new with a simple configuration.

  In the dishwasher according to the third invention, as in the dishwasher according to the first and second inventions, it is determined by the checking means whether or not there is stored water in the water supply tank, but there is stored water in the water supply tank. Even when it is determined that the stored water is old water or new water, it is not estimated, and the notification means performs notification notifying that there is stored water. And, similarly to the dishwasher according to the first invention, when the user performs a predetermined operation according to the notification, the forced drainage means discharges the stored water in the water supply tank to the outside of the machine, Drainage is not performed unless the user performs a predetermined operation.

  Therefore, in the dishwasher according to the third aspect of the invention, since the notification is made even when the user pours water into the water supply tank immediately before turning on the power, the user always keeps the stored water in the water supply tank. While there is some annoyance that requires judgment, it is possible to avoid dishwashing using unsanitary water that has passed for a long time in the water supply tank due to automatic erroneous judgment. it can. Thereby, dishwashing can be performed more reliably using clean water. In addition, the water just injected is not wasted.

  In the dishwasher according to the fourth invention, as in the dishwasher according to the first and second inventions, it is determined by the checking means whether or not there is stored water in the water supply tank, but there is stored water in the water supply tank. Even if it is determined that the stored water is old water or new water, it is not estimated, and there is no notification that there is stored water as in the dishwasher according to the third invention. The means discharges the stored water in the water supply tank to the outside of the machine. Therefore, in the dishwasher according to the fourth aspect of the present invention, if the user pours water into the water supply tank immediately before the power is turned on, the water is wasted, but dishwashing is performed more reliably using clean water. be able to.

  In the dishwasher according to the fifth and sixth inventions, at the time of pouring water into the water supply tank after the power is turned on, the water pouring time acquisition means measures or estimates the water pouring time until the predetermined water level is reached by the detecting means. When water supply to the water supply tank is performed from a water tap via a hose, for example, the water injection time depends on the opening of the water tap and the supply capacity of the water tap, but standard conditions are assumed. In this case, it takes some time to reach a predetermined water level from a state where the water supply tank is almost empty. Therefore, when the water injection time is too short, it is appropriate to determine that the inside of the water supply tank was not empty before the start of water injection.

  Therefore, in the dishwasher according to the fifth aspect of the present invention, when the water injection time is short, it is assumed that water has already been stored in the water supply tank before water injection, and the notification means issues a warning notification to the user. As described above, the user who has recognized that there is stored water by the notification means determines whether or not the water in the water supply tank before the water injection is old. And when a user judges that the water in a water supply tank is old, operation for performing the drainage which performs predetermined | prescribed key operation, for example is performed. The forced drainage means receives the operation by the user and discharges the water accumulated in the water supply tank to the outside of the machine.

  Therefore, according to the dishwasher according to the fifth aspect of the invention, for example, even when water at a position lower than a predetermined water level that can be detected by the detection means is stored in the water supply tank before water injection, the stored water is present. The user can simply use a simple operation such as pressing the drain key to dispose of the unsanitary water in the water tank and clean it using fresh water. Can perform proper dishwashing. Thereby, hygienic dishwashing can always be performed. On the other hand, when water is poured into the water supply tank just before the power is turned on for dishwashing, the user performs normal operation such as setting the operation course and pressing the start key as it is. It is possible to execute the operation using the water without wasting it.

  On the other hand, in the dishwasher according to the sixth aspect of the invention, if the water injection time is short, it is considered that water has already been stored in the water supply tank before water injection, and the forced drainage means stays in the water supply tank without warning. Drain the water out of the machine. Therefore, if there is stored water in the water supply tank before water injection, drainage is performed without bothering the user. For example, the user is temporarily away from the dishwasher. Even in this case, old water can be automatically drained and housework can be carried out efficiently, and clean dishwashing can be performed using freshly poured clean water.

[First embodiment]
First, a dishwasher according to an embodiment (first embodiment) of the first invention will be described with reference to the drawings. FIG. 1 is a side longitudinal sectional view of a dishwasher according to the present embodiment, and FIG. 2 is a perspective view illustrating an example of an installation state of the dishwasher according to the present embodiment.

  The dishwasher 1 has a casing 2 that forms an outer shape, and a cleaning cabinet 3 that also serves as a drying chamber is disposed inside the casing 2. An upper door 4 and a lower door 5 that are pivotally supported at the upper end and the lower end, respectively, are attached to the front opening of the cleaning cabinet 3 so as to open in a vertical direction. A handle 6 is provided at the center of the upper end of the lower door 5. When the user grasps the handle 6 and pulls the lower door 5 forward (to the left in FIG. 1) and opens it, the upper door is interlocked with this. The door 4 is configured to open upward. An operation panel 7 is disposed below the lower door 5. On the operation panel 7, a power switch, a start key, a course selection key, and the like are arranged as an operation section, and a course display section that displays a driving course selected by the course selection key as a display section, and a drying time In addition, a condition display section for displaying the presence or absence of the hot water supply setting is arranged.

  The tableware bowl 8 for storing tableware is put into and out of the washing cabinet 3 with the upper door 4 and the lower door 5 opened. A rotatable nozzle arm 9 having a plurality of water injection holes 10 formed on the upper surface is provided at the bottom of the cleaning cabinet 3. In this dishwasher, since the width of the washing cabinet 3 is larger than the depth, water does not reach the both sides of the washing cabinet 3 with only one nozzle arm. Therefore, another nozzle arm (not shown) is provided in a position that does not interfere with the nozzle arm 9 shown during rotation. A bottom 11 of the washing cabinet 3 is recessed in a step and a water reservoir 11 is formed. A top filter 12 is detachably provided on the top surface to collect the leftovers that have flowed down from the dishes. Yes.

  A washing and draining pump 13 is disposed below the bottom wall surface of the washing cabinet 3. Although not shown, the cleaning and drainage pump 13 has a cleaning pump chamber and a drainage pump chamber partitioned by a partition wall, and the cleaning pump chamber and the drainage pump chamber are for cleaning mounted coaxially with the pump motor. An impeller and a drainage impeller are provided. The suction port 14 of the cleaning pump chamber is connected to a circulation port 15 provided on the rear wall of the water reservoir 11, and the discharge port 16 is connected to the nozzle arm 9 via a water passage 17 that extends in the lateral direction. And it communicates with the water channel of the other nozzle arm (not shown). On the other hand, although not shown, the suction port of the drainage pump chamber is connected to the drainage port 18 provided on the side wall of the water reservoir 11, and the discharge port of the drainage pump chamber communicates with the outside through the drainage hose 19. ing.

  A water supply tank 21 is disposed at the lower part of the dishwasher 1 so that it can be pulled out forward. In front of this water supply tank 21, a water supply port 22 is provided for connecting an outlet end of a water supply hose 27 for introducing water from a water supply mechanism to be described later. The water supply tank 21 has an internal volume capable of storing water necessary for standard dishwashing operation. In order to suck the water stored in the water supply tank 21, a water intake pipe 23 and a water intake pump 24 are installed below the washing chamber 3. When the water intake pump 24 is operated in a state where water of a predetermined water level or more is stored in the water supply tank 21, the water is sucked up through the water intake pipe 23 and poured into the cleaning chamber 3, and the cleaning chamber including the water reservoir 11. 3 is stored at the bottom.

  The level of water stored in the washing cabinet 3 is from an air trap (not shown) communicating with the water reservoir 11, a pressure sensor arranged at the lower back of the washing cabinet 3, and an air hose connecting the air trap and the pressure sensor. It is detected by the internal water level sensor 25. In addition, a loop-shaped heater 26 is provided at the bottom of the cleaning chamber 3 to heat the water stored in the cleaning chamber 3 and to heat the air in the cleaning chamber 3 during drying.

  In the dishwasher of this embodiment, although not shown in FIG. 1, a blower is arranged beside the washing and draining pump 13, and when the fan of the blower is rotated during the drying operation, the casing 2 The outside air sucked in from the intake port formed on the side surface or the back surface of the air is introduced into the cleaning cabinet 3, while the air containing moisture in the cleaning cabinet 3 is discharged from the exhaust port on the front side to the outside of the machine. It is like that.

  In the dishwasher of the present embodiment, the water stored in the water supply tank 21 is sucked up by the water intake pump 24 as described above, and water at a predetermined water level (for example, the water storage level described in FIG. 1) is stored at the bottom of the washing cabinet 3. In this state, washing and rinsing are performed. That is, the pump motor 13a of the cleaning / drainage pump 13 functions as a cleaning pump by being driven to rotate in the forward direction. At this time, the water sucked from the water reservoir 11 through the circulation port 15 is pumped to the nozzle arm 9 through the water channel 17 by the action of the rotating cleaning impeller. Then, water is ejected from a water injection hole 10 provided on the upper surface of the nozzle arm 9, and the nozzle arm 9 rotates in a predetermined direction about a substantially vertical axis by the water force. The water sprayed from the water spray hole 10 hits the tableware stored in the washing cabinet 3, and removes dirt adhering to the tableware or allows detergent water to flow.

  On the other hand, the washing and draining pump 13 functions as a drainage pump by the pump motor 13a being rotationally driven in the reverse direction. At this time, the water sucked from the water reservoir 11 through the drain port 18 is discharged to the outside through the drain hose 19 by the action of the rotating drain impeller.

  Since the water supply tank 21 can be pulled out, for example, when the dishwasher 1 is installed on the top plate 61 of the kitchen system kitchen 60 as shown in FIG. 2, the user pulls the water supply tank 21 forward. Water can be poured into the water supply tank 21 from the upper surface opening. However, since such water injection work is generally troublesome, as shown in FIG. 2, it is prepared as an accessory (or sold separately) at the tip of the faucet of the water tap 63 above the sink 62. The branch water supply device 28 is attached, and the water supply hose 27 connects the branch water supply device 28 and the water supply port 22. When the user needs to inject water into the water supply tank 21, the lever of the branch water supply device 28 is rotated to switch the internal water channel to the water supply hose 27, and the water tap 63 is opened to open the water supply tank 63. Supply water to 21.

  FIG. 3 is an electric system configuration diagram of a main part of the dishwasher of the present embodiment. The control unit 30 functioning as confirmation means, time lapse estimation means, etc. in the present invention is configured around a microcomputer including a CPU, and the rotation of the pump motor 13a of the washing and draining pump 13 is rotated via an inverter drive unit 31. While controlling, the operation | movement of the water intake pump 24, the heater 26, and the fan motor 40 for dry ventilation is controlled via the load drive part 32. FIG. The control unit 30 includes an operation unit 7a including a power switch 41, a display unit 7b, a buzzer 7c, a door switch 35, an internal temperature sensor 36, an internal water level sensor 25, and a tank water level as a detection means in the present invention. A sensor 37, an in-tank water temperature sensor 38 as a water temperature detecting means in the present invention, an atmospheric temperature sensor 39 as an atmospheric temperature detecting means in the present invention, and the like are also connected. In addition, driving power is supplied to the control unit 30 from a power supply circuit 33 connected to a commercial AC power supply via a power plug 34, and the driving power is distributed to each part under the control of the control unit 30. ing. The control unit 30 includes a ROM in which a control program is stored, and the CPU performs operation control as will be described later when the CPU executes the control program.

  In the dishwasher of the present embodiment, if the power plug 34 is inserted into a commercial AC power outlet, even when the power switch 41 is turned off, at least the drive power is supplied to the control unit 30. . At this time, all the displays on the display unit 7b have disappeared and the power supply is completely shut off, but the control unit 30 can perform a predetermined control operation. Therefore, the control unit 30 can detect whether water has been injected into the water supply tank 21 based on the detection signal of the tank water level sensor 37. However, if the power plug 34 is not inserted into the commercial AC power outlet, the control unit 30 does not operate at all, so that it is not possible to recognize water injection into the water supply tank 21.

  Therefore, in the dishwasher of this embodiment, a characteristic water supply / drainage process is executed when the power plug 34 is removed and inserted into a commercial AC power outlet, that is, when the power is turned on. Next, this processing operation will be described with reference to the flowcharts of FIGS.

  When the power plug 34 is inserted into a commercial AC power outlet from a state where the power plug 34 is removed, the power circuit 33 starts supplying power to the control unit 30 and the like, and the microcomputer that is the center of the control unit 30 is activated to have a predetermined initial value. A setting operation is executed (step S10). Thereafter, the control unit 30 detects the amount of water in the water supply tank 21 by the tank water level sensor 37 (step S11), thereby determining whether or not water is stored in the water supply tank 21 (step S12).

  If it is determined that water is stored in the water supply tank 21 (Yes in step S12), the tank water temperature T1 is read based on the detection signal of the tank water temperature sensor 38 (step S13), and then the ambient temperature sensor 39. Based on the detection signal, the ambient temperature T2 is read (step S14). The ambient temperature is the ambient temperature around the dishwasher, and the ambient temperature sensor 39 is attached at a position where such temperature can be measured. If both temperatures T1 and T2 are acquired, a temperature difference ΔT = | T2−T1 | is calculated (step S15), and it is determined whether or not the obtained temperature difference ΔT is equal to or less than a predetermined value Ta. (Step S16).

  In general, the temperature of water supplied from a water tap is relatively stable throughout the year and has little fluctuation. Therefore, the ambient temperature is higher than the water temperature when the outside temperature is relatively high, such as in summer, and conversely, the ambient temperature is often lower than the water temperature when the outside temperature is relatively low, such as in winter. . Therefore, it is considered that the situation where the temperature of the water just supplied from the tap is almost equal to the ambient temperature is considerably low throughout the year. On the other hand, when the tap water is stored in the water supply tank 21 and time elapses, the water temperature rises or falls due to the influence of the ambient temperature and gradually approaches the outside air temperature as time elapses. For this reason, when the difference between the temperature of the water stored in the water supply tank 21 and the ambient air temperature (that is, the temperature difference ΔT) is sufficiently small, a considerable time has passed since the water was introduced into the water supply tank 21. When the difference between the temperature of the stored water and the ambient air temperature is large, the time has not passed so much since the water was introduced into the water supply tank 21, and the probability is high. It is possible to estimate.

  Therefore, the prescribed value Ta is set to a value that allows the above determination, and if Yes in step S16, the water in the water supply tank 21 is old, and if No, the water in the water supply tank 21 is Judge as new. Here, the specified value Ta may be determined to an appropriate value experimentally, but may be set to about 1 to 2 ° C., for example.

  When it is determined that the water in the water supply tank 21 is old, a warning notification that there is residual water is generated by turning on a predetermined display or ringing the buzzer 7c on the display unit 7b, which is a notification means in the present invention. Is performed (step S17). When the user notices this warning notification and determines that the water in the water supply tank 21 needs to be replaced, the user operates the drain key in the operation unit 7a. On the other hand, even when a warning notification is given, no operation is performed when the user determines that the water in the water supply tank 21 is not required to be replaced. Therefore, the control unit 30 determines whether or not the drain key is operated within a predetermined time period from the warning notification (step S18). When the drain key is operated, the intake pump 24 is first activated. After the water in the water supply tank 21 is sucked up and moved into the washing cabinet 3 (step S19), the pump motor 13a is operated as a drainage pump to discharge the water in the washing cabinet 3 to the outside through the drainage hose 19. (Step S20). Thereby, the stored water in the water supply tank 21 is discarded outside the machine through the washing cabinet 3. Therefore, the intake pump 24, the pump motor 13a, the inverter drive unit 31, the load drive unit 32, and the control unit 30 that drive the intake pump 24 correspond to the forced drainage means in the present invention.

  Of course, in order to dispose of the stored water in the water supply tank 21 to the outside of the machine, a drainage valve is provided in the water supply tank 21, and the drainage valve is opened, for example, from the water supply tank 21 without passing through the washing cabinet 3, for example, the drainage hose 19 For example, the water may be discarded directly outside the apparatus.

  After the intake pump 24 and the drainage pump are operated, it is repeatedly determined whether or not the drainage is completed (step S21). As an example of the determination of the completion of drainage, when the water level sensor 37 in the tank can detect the water levels in a plurality of stages (or no steps) in the water supply tank 21, the detected water level in the water supply tank 21 is the lowest. It can be determined that drainage is complete when the water level falls below the set water level. Alternatively, the drainage time may be determined in advance in consideration of drainage capacity, and it may be determined that drainage has been completed when the drainage time has elapsed from the start of operation of the intake pump 24 and the drainage pump. Further, the completion of drainage of residual water in the water supply tank 21 may be determined based on a detection signal from the internal water level sensor 25 instead of detection by the internal water level sensor 37.

  In any case, if it is determined that the drainage is completed, the intake pump 24 is stopped (step S22), and the pump motor 13a is also stopped to stop the drainage pump (step S23). Thereafter, it is determined whether or not there is a power-on operation by the power switch 41 (step S30). If there is no power-on operation, the process returns to step S11. If there is a power-on operation, the process proceeds to a water supply process in step S31.

  If it is determined in step S12 that there is no water in the water supply tank 21, the processes in steps S13 to S23 are skipped and the process proceeds to the determination in step S30. Furthermore, when it is determined that the water in the water supply tank 21 is new according to the determination in step S16, and when it is determined in step S18 that there is no operation of the drain key within a predetermined time after the warning notification, the water supply tank 21 is also the same. It progresses to step S30, without discarding the water already stored in the inside.

  In the water supply process, first, the user waits for water injection to the water supply tank 21. This water injection is basically performed by the lever switching operation of the branch water supply device 28 and the opening / closing operation of the water tap 63 as described above. When a predetermined amount or more of water is accumulated in the water supply tank 21 due to the water injection, the water intake pump 24 is operated, and an amount of water necessary for the washing process is sucked from the water supply tank 21 and stored in the bottom of the washing chamber 3. And when the inside of the water supply tank 21 becomes full, for example, a notification is given by the buzzer 7c, and the user stops water injection accordingly.

  Next, the control unit 30 determines whether or not the start key is operated in the operation unit 7a (step S32). If there is no operation of the start key, it is determined whether or not there is a course selection operation (step S33). . If the user selects a course, the selected course is displayed on the display unit 7b (step S34), and the process returns to step S32. It is assumed that a standard course is set when the user does not select a course.

  When driving, the user stores the dishes in the tableware bowl 5, opens the doors 4, 5 and stores the tableware bowl 8 in the washing cabinet 3, and puts an appropriate amount of detergent into the washing cabinet 3, After closing the doors 4 and 5, the course selection is performed by the operation selection unit 7 a using the course selection key as necessary, and then the start key is pressed. When the control unit 30 receives the operation of the start key (Yes in step S32), the control unit 30 starts the operation in a predetermined order.

  That is, first, the washing process is executed by spraying the detergent water, which is the detergent put into the washing chamber 3 dissolved in water, onto the dishes (step S35). After that, as a rinsing process, in order to wash away the detergent water adhering to the tableware, rinsing 2 to 3 times, sterilizing and warming the tableware to increase the drying efficiency at the next drying, high temperature A heating rinse using no hot water is performed (step S36). In the washing process and the rinsing process so far, the water stored in the water supply tank 21 is sucked by the water pump 24 and the water stored at the bottom of the washing cabinet 3 is used. After that, the fan motor 40 is operated and the heater 26 is energized to supply heated air into the washing cabinet 3 to execute a drying process for drying the dishes that have been washed (step S37). When the predetermined drying operation time ends, all the operations are ended, the display unit 7b is turned off (step S38), and the process returns to step S11.

  As described above, in the dishwasher of the present embodiment, when water is already stored in the water supply tank 21 at the time when the power supply to the control unit 30 is started, the water is old or new. When it is determined that it is old (a long time has elapsed from the time of water injection), a warning of remaining water is issued. Therefore, when this warning notification is made, the user himself / herself judges, and when it is judged that the water is really old and has a sanitary problem, the water in the water supply tank 21 is replaced and the operation is started. On the other hand, if the user determines that the water is not actually old water or old water but is not sanitary, the water can be used to start operation.

[Second Embodiment]
Next, operation control of the dishwasher according to one embodiment (second embodiment) of the second invention will be described with reference to the flowchart of FIG. The configuration of the dishwasher of the second embodiment is the same as that of the first embodiment, and only the control operation in the control unit 30 is slightly different from that of the first embodiment. FIG. 6 is a flowchart in place of FIG. 4 in the first embodiment, and FIG. 5 is a common part in the second embodiment. In FIG. 6, the same processing steps as those in FIG.

  In the first embodiment, when it is determined that the water stored in the water supply tank 21 is old, a warning notification is given to the user to ask for the user's judgment. This second embodiment Then, when it is determined that the water stored in the water supply tank 21 is old, the water in the water supply tank 21 is unconditionally discarded. In order to perform such a control operation, steps S17 and S18 in the flowchart of FIG. 4 of the first embodiment are deleted in the flowchart of the second embodiment shown in FIG. 6, and if it is determined Yes in step S16. Immediately proceed to step S19.

  Therefore, according to the dishwasher according to the second embodiment, the water in the water supply tank 21 is wasted when it is erroneously determined in step S16 that the water poured into the water supply tank 21 is new although it is new. There is a disadvantage of becoming. On the other hand, since the user's judgment and operation are not required for the disposal of the water in the water supply tank 21, for example, even when the user is not near the dishwasher, the water in the water supply tank 21 is automatically discarded. There is an advantage that it is possible to wait in the state.

[Third embodiment]
Next, the operation control of the dishwasher according to another embodiment (third embodiment) of the first invention will be described with reference to the flowcharts of FIGS. The configuration of the dishwasher of the third embodiment is the same as that of the first embodiment, and only the control operation in the control unit 30 is slightly different from that of the first embodiment. In FIG. 7 and FIG. 8, the same processing steps as those in FIG. 4 and FIG.

  In the dishwasher of the first and second embodiments, it is determined whether the water in the water supply tank 21 is old or new before the power-on operation by the power switch 41, that is, in a state where the power is apparently cut off. In the dishwasher of the third embodiment, a series of processes are executed after the power-on operation by the power switch 41. That is, after the power plug 34 is inserted into the commercial AC power outlet and the microcomputer of the control unit 30 is activated, the system waits until the power switch 41 is operated (step S30). When the user performs a power-on operation with the power switch 41, the processing after step S11 described in the first embodiment is executed.

  Therefore, in the dishwasher of the third embodiment, the intake pump 24 and the pump motor 13a do not operate when the power supply is apparently cut off, so that the power supply should be cut off. It is possible to prevent the user from having a mysterious feeling that a residual water warning is issued or the intake pump is operated.

[Fourth embodiment]
Next, operation control of the dishwasher according to one embodiment (fourth embodiment) of the third and fifth inventions will be described with reference to the flowcharts of FIGS. In FIG. 9 and FIG. 10, the same process steps as those in FIG. 4 and FIG.

  In the dishwasher of the fourth embodiment, detection of the temperature of the water in the water supply tank 21 and the ambient temperature is not executed. Accordingly, the tank water temperature sensor 38 and the atmospheric temperature sensor 39 provided in the dishwasher of the first to third embodiments can be omitted, but the other configurations are the same as those of the first embodiment.

  In the dishwasher of the fourth embodiment, as in the third embodiment, it is determined whether or not water is stored in the water supply tank 21 in step S12. Without executing the process of determining whether or not the water is old, a warning notification is immediately given to the user and the user's judgment is asked. In order to perform such control operation, in the flowchart in the fourth embodiment shown in FIG. 9, steps S13 to S16 in the flowchart of FIG. 4 of the first embodiment are deleted, and if it is determined Yes in step S12. Immediately proceed to step S17. Therefore, according to the dishwasher according to the fourth embodiment, it is avoided that the water poured into the water supply tank 21 is erroneously determined to be new water even though it is old, thereby taking away the opportunity for water replacement. it can.

  When it is determined in step S12 that water is not stored in the water supply tank 21, the process proceeds to step S31 to wait for a manual water injection operation by the user. The tank water level sensor 37 is, for example, a water level detection switch. Since it is difficult to detect the water level in multiple stages, the determination process actually performed in step S12 is a determination as to whether or not a full amount of water is stored. Therefore, even if old water remains in the water supply tank 21, it is determined that there is no residual water when the water level cannot be detected by the tank water level sensor 37. Therefore, in order to prevent overlooking such residual water as much as possible, it is detected that the stored water in the water supply tank 21 is full in the water supply stroke of step S31 from the time when it is determined that the power switch 41 is operated in step S30. The control unit 30 measures the required time until it is set as the water supply time, and determines whether or not the water supply time is equal to or greater than a specified value (step S40).

  The water supply time includes the length of time from when the user operates the power switch 41 to when water is supplied to the water supply tank 21, the opening of the water tap when water is supplied to the water supply tank 21, and the water supply capacity of the water tap Although depending on various factors, if the water supply tank 21 is empty before the water supply process is executed, it takes a certain amount of time to fill it up, so the water supply time is too short. It can be assumed that there is a high possibility that water remains in the water supply tank 21 before water supply. Therefore, when it is determined in step S40 that the water supply time is less than the specified value, the same processes of steps S41 to S47 as steps S17 to S23 described above are executed.

  That is, before water is injected into the water supply tank 21, a warning notification that there is residual water in the water supply tank 21 is executed, and if the user operates the drain key accordingly, the water in the water supply tank 21 is discharged. Discard. On the other hand, if the drain key is not operated, it is assumed that the user does not intend to discard the water in the water supply tank 21, and the start key is operated. If it is determined in step S40 that the water supply time is equal to or greater than the specified value, it is determined that the water supply tank 21 is almost empty before water injection, and the processes of steps S32 to S38 already described are executed.

[Fifth embodiment]
Next, operation control of the dishwasher according to one embodiment (fifth embodiment) of the fourth and sixth inventions will be described with reference to the flowcharts of FIGS. In FIG. 11 and FIG. 12, the same processing steps as those in FIG. 4 to FIG.

  In the dishwasher of the fourth embodiment, when it is determined in steps S12 and S40 that there is residual water in the water supply tank 21, a residual water warning is issued once, and if the user operates the drain key, the drainage key is drained. However, in the dishwasher of the fifth embodiment, when it is determined that there is residual water in the water supply tank 21, drainage is immediately performed without warning. That is, steps S17, S18, S41, and S42 in the flowcharts of FIGS. 9 and 10 of the fourth embodiment are omitted in the flowchart of the fifth embodiment. Therefore, as in the second embodiment, since the user's judgment and operation are not required for the disposal of the water in the water supply tank 21, for example, even when the user is not near the dishwasher, the water is automatically supplied. There is an advantage that it is possible to wait in a state where the water in the tank 21 is discarded.

[Sixth embodiment]
In any of the dishwashers of the first to fifth embodiments, the control unit 30 can be operated if the power plug 34 is inserted into a commercial AC power outlet. Even when the operation is not executed, a slight drive current always flows through the control unit 30. On the other hand, in order to achieve zero standby power consumption, it is possible to adopt a configuration in which the power supply to all the electric circuits including the control unit 30 is cut off when the power is turned off. The sixth embodiment is a dishwasher having such a configuration. FIG. 13 is a block diagram of the electrical system of the dishwasher according to the sixth embodiment. Components identical or corresponding to those shown in FIG. 3 are given the same reference numerals.

  In the dishwasher of the sixth embodiment, as shown in FIG. 13, based on a command from the control unit 30, auto power off (APO) that completely cuts off the power supplied from the power supply circuit 33 after a predetermined time has elapsed from the command. A circuit 42 is provided, and the power switch 41 is connected to the power circuit 33 so that the power can be turned on even when the control unit 30 is not operating. Therefore, in the power-off state, the control unit 30 centering on the microcomputer is also completely stopped, and the microcomputer is activated only when the user operates the power switch 41 to turn on the power. That is, in the dishwasher of the sixth embodiment, the action of turning on the power with the power switch 41 corresponds to the action of inserting the power plug 34 into the commercial AC power outlet in the dishwasher of the first to fifth embodiments. become.

  14 and 15 are flowcharts of characteristic operations centering on the water supply / drainage treatment in the sixth embodiment. The same step numbers are assigned to the same processing steps as those in the flowcharts of the dishwashers of the first to fifth embodiments already described. The basic processing operation is the same as that of the first embodiment, and the only difference is that step S9 is added in FIG. 14 and step S50 is added in FIG.

  That is, assuming that the dishwasher is in a power-off state as an initial state, when the user turns on the power by pressing the power switch 41 from this state (step S9), the power circuit 33 is connected to the control unit 30 and the like. Power supply is started, and thereby the microcomputer of the control unit 30 is activated (step S10). Processing operations after step S11 after activation are the same as those in the first embodiment. On the other hand, when a series of operation ends (step S38), the APO circuit 42 that has received a command from the control unit 30 forcibly cuts off the power supplied by the power supply circuit 33 after a predetermined time (for example, 5 minutes) has elapsed. (Step S50). Of course, if the user performs a power-off operation with the power switch 41 before that, the driving power is similarly cut off. After the power is turned off in this way, the drive current does not flow in all the electric circuits including the control unit 30, so that standby power consumption becomes zero.

  Regarding the dishwasher of the sixth embodiment, the control flowchart can be modified similarly to the dishwashers of the second to fifth embodiments, and each has the advantages as described above. For example, FIG. 16 shows an example where the flowchart of the dishwasher of the sixth embodiment is modified in the same manner as the second embodiment. That is, FIG. 16 omits steps S17 and S18 in the flowchart of FIG.

  It should be noted that any of the above embodiments is merely an example of the present invention, and it is apparent that the present invention is encompassed by the present invention even if appropriate modifications, corrections or additions are made within the scope of the present invention.

The side longitudinal section of the dishwasher by one example (the 1st example) of the present invention. The perspective view which shows an example of the installation state of the dishwasher of 1st Example. The electric system block diagram of the principal part of the dishwasher of 1st Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 1st Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 1st Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 2nd Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 3rd Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 3rd Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 4th Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 4th Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 5th Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 5th Example. The electric system block diagram of the principal part of the dishwasher of 6th Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 6th Example. The flowchart which shows the control operation centering on the water supply / drainage process in the dishwasher of 6th Example. The flowchart which shows control operation centering on the water supply / drainage process in the dishwasher of the modification of 6th Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Dishwasher 2 ... Housing 3 ... Washing cabinet 4 ... Upper door 5 ... Lower door 6 ... Handle 7 ... Operation panel 7a ... Operation part 7b ... Display part 7c ... Buzzer 8 ... Tableware bowl 9 ... Nozzle arm 10 ... Water jet Hole 11 ... Water reservoir 12 ... Sweet filter 13 ... Washing and draining pump 13a ... Pump motor 14 ... Suction port 15 ... Circulation port 16 ... Discharge port 17 ... Water passage 18 ... Drain port 19 ... Drain hose 21 ... Water supply tank 22 ... Water inlet 23 ... Intake pipe 24 ... Intake pump 25 ... In-house water level sensor 26 ... Heater 27 ... Water supply hose 28 ... Branch water supply device 30 ... Control part 31 ... Inverter drive part 32 ... Load drive part 33 ... Power supply circuit 34 ... Power supply Plug 35 ... Door switch 36 ... Inside temperature sensor 37 ... Tank water level sensor 38 ... Tank water temperature sensor 39 ... Atmosphere temperature sensor 40 ... Fan motor 41 ... Power switch 42 ... Auto Power Off (APO) circuit 63 ... water tap

Claims (10)

Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A dishwasher having a water supply tank for storing a necessary amount of water, and performing washing and rinsing operations by moving water from the water supply tank into the washing cabinet,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
A time lapse estimation means for estimating whether or not a long time has elapsed since the water was poured into the water supply tank when it is determined by the confirmation means that there is stored water;
Informing means for informing the user based on the estimation result by the time lapse estimating means,
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
A dishwasher characterized by comprising: Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A dishwasher having a water supply tank for storing a necessary amount of water, and performing washing and rinsing operations by moving water from the water supply tank into the washing cabinet,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
A time lapse estimation means for estimating whether or not a long time has elapsed since the water was poured into the water supply tank when it is determined by the confirmation means that there is stored water;
A forced drainage means for discharging the stored water in the water supply tank to the outside when it is determined by the time lapse estimation means that the stored water has passed for a long time;
A dishwasher characterized by comprising: The time lapse estimation means includes
Water temperature detecting means for detecting the water temperature of the stored water in the water tank;
An ambient temperature detection means for detecting the ambient ambient temperature;
A process of calculating a temperature difference between the water temperature and the atmospheric temperature, and determining that a long time has elapsed since the water was poured into the water supply tank when the temperature difference is a predetermined value or less. Means,
The dishwasher according to claim 1, further comprising: Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A dishwasher having a water supply tank for storing a necessary amount of water, and performing washing and rinsing operations by moving water from the water supply tank into the washing cabinet,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
Notification means for notifying the user of the result of confirmation by the confirmation means;
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
A dishwasher characterized by comprising: Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A dishwasher having a water supply tank for storing a necessary amount of water, and performing washing and rinsing operations by moving water from the water supply tank into the washing cabinet,
Detecting means for detecting whether water is stored in the water supply tank;
Confirmation means for confirming the presence or absence of stored water in the water supply tank by the detection means immediately after turning on the power;
Forcibly draining means for discharging the stored water in the water supply tank to the outside when the confirmation means determines that there is stored water;
A dishwasher characterized by comprising: Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A water supply tank for storing a necessary amount of water, water is poured into the water supply tank from an external tap, and the water is temporarily stored, and the stored water is stored in the washing chamber from the water supply tank. In a dishwasher that carries out washing and rinsing operations by moving
Detecting means for detecting whether or not the water level of the stored water in the water supply tank has reached a predetermined water level;
Water injection time acquisition means for measuring or estimating the water injection time until the predetermined water level is reached by the detection means at the time of water injection to the water supply tank after turning on the power;
When the water injection time is short, notifying means for notifying the user that warning water has already been stored in the water supply tank before water injection;
A forced drainage means for receiving a predetermined operation by the user after the notification by the notification means, and discharging the stored water in the water supply tank to the outside of the machine;
A dishwasher characterized by comprising: Tableware is housed inside, a washing cabinet for washing the tableware by sucking the water stored in the bottom and spraying it toward the tableware, and outside the washing cabinet for operation A water supply tank for storing a necessary amount of water, water is poured into the water supply tank from an external tap, and the water is temporarily stored, and the stored water is stored in the washing chamber from the water supply tank. In a dishwasher that carries out washing and rinsing operations by moving
Detecting means for detecting whether or not the water level of the stored water in the water supply tank has reached a predetermined water level;
Water injection time acquisition means for measuring or estimating the water injection time until the predetermined water level is reached by the detection means at the time of water injection to the water supply tank after turning on the power;
When the water injection time is short, it is assumed that there is already stored water in the water supply tank before water injection, forced drainage means for discharging the stored water in the water supply tank outside the machine,
A dishwasher characterized by comprising:   2. The apparatus according to claim 1, wherein each means is operable whenever AC power is supplied from a commercial AC power supply, and the power is turned on when the supply of the AC power is started. The dishwasher in any one of -7.   Each means can always operate when AC power is supplied from a commercial AC power supply, and includes an operation section that apparently turns on / off the power in response to an operation by a user. The dishwasher according to any one of claims 1 to 7, wherein power is turned on when an operation is performed. An operation unit that turns on / off the power in response to an operation by the user, and an auto power-off unit that automatically turns off the power even if the operation unit does not perform a power-off operation at the end of operation. 8. The power supply to each means is stopped, and the power is turned on when a power-on operation of the operation unit is performed. Dishwasher.

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