JP4780791B2 - dishwasher - Google Patents

Description

  The present invention relates to a dishwasher that always performs a water draining operation during a trial operation in the first operation after the installation of the dishwasher. In more detail, when the dishwasher is installed in the system kitchen and the power cord is plugged into the power outlet, the first time the operation is started, it is necessary to ensure that the foreign matter that has entered the water supply pipe is discharged. The present invention relates to a dishwasher capable of performing a water discarding operation.

When a dishwasher of the type incorporated in the system kitchen is installed in the system kitchen by a contractor, the water supply hose provided in the main body of the water supply pipe and drainage pipe is installed in advance before the equipment is installed. And connected to a drain hose. When constructing this pipe, foreign matter such as metal powder or dust may enter the water supply pipe of the facility, and rust may be generated in the water supply pipe. At times, the construction manual instructs the other faucet to open and allow several liters of water to flow.
However, such work may not always be performed at the time of construction, and when the dishwasher is used for the first time, foreign substances in the water supply pipe may enter the water supply valve provided at the water supply inlet of the device. When water is supplied into the equipment in such a state and the water level detector detects a predetermined water level, the water supply valve is closed with foreign matter caught in its seal, and a state in which the valve cannot be completely closed occurs. This will cause an unsatisfactory water leak.

In addition to this, as a countermeasure against water leakage in a dishwasher, an invention for detecting abnormal water supply into a washing tank due to a failure of a water supply valve is described in Japanese Patent No. 3293256 ("Dishwasher", Patent Document 1). As has already been proposed.
The dishwasher described in Patent Document 1 has a normal configuration as shown in FIG. 5, and includes a washing tub 41 having a dish basket 52 for storing tableware 42 and a washing nozzle 43. A cleaning pump 44 driven by a motor 45 to feed cleaning water to the cleaning nozzle 43, a water supply valve 46 for supplying tap water into the cleaning tank 41, a water level sensor 47 for detecting a predetermined water level in the cleaning tank 41, and a cleaning A heater 48 for heating water, a thermistor 49 for detecting the water temperature of the cleaning water, a blower fan 50 for sending the steam in the cleaning tank 41 from the exhaust port 51, and control operations such as cleaning, rinsing and drying processes are controlled. It consists of the control means 53 and the like.

  In such a dishwasher, when the tableware 42 is stored in the tableware basket 52 and the operation is started by turning on the start switch, the control means 53 supplies water until the water level sensor 47 detects a predetermined water level in the water supply operation. A cleaning process or a rinsing process is performed. At this time, since the cleaning water in the cleaning tank 41 is sent to the cleaning nozzle 43 by the cleaning pump 44 and sprayed to the dishes 42, the water level of the cleaning water is significantly lowered. As a result, the water level sensor 47 does not detect the predetermined water level after about 3 seconds have passed since the start of the cleaning process or the like.

  On the other hand, the control means 53 monitors the abnormal water supply to the washing tank 41 due to the failure of the water supply valve 46 from the start of operation, and as shown in step 91 of FIG. Whether or not to detect is monitored. That is, it is impossible for the water level sensor 47 to continuously detect the predetermined water level for 3 seconds or more in a normal operation, but abnormal water supply to the cleaning tank 41 is performed due to a failure of the water supply valve 46. In step 91, the predetermined water level is detected continuously for 20 seconds. In step 92, the abnormality of the water supply valve 46 is detected and this abnormality is notified.

Furthermore, the above-described Patent Document 1 describes the detection of abnormal water supply into the cleaning tank 41 due to a failure of the water supply valve 46 as follows.
(1) In the cleaning process or the rinsing process, when the water level sensor 47 detects a predetermined water level exceeding a preset number of times (for example, 4 times), it is determined that the water supply into the cleaning tank 41 is abnormal due to a failure of the water supply valve 46. To inform.
(2) When the water level sensor 47 detects a predetermined water level continuously for a predetermined time (for example, 20 seconds) after a predetermined time (for example, 5 seconds) has elapsed since the start of the cleaning process or the rinsing process, the water supply valve 46 It is determined that there is an abnormal water supply to the cleaning tank 41 due to a malfunction of the water and is notified.
(3) When the water level sensor 47 detects a predetermined water level from the beginning, the water level sensor 47 detects the predetermined water level continuously for a predetermined time after draining until the water level sensor 47 reaches a water level that does not detect the predetermined water level. When it is done, it is determined that there is an abnormal water supply into the cleaning tank 41 due to a failure of the water supply valve 46, and notification is made.

Japanese Patent Laid-Open No. 2000-18429 ("Water Supply Control Device", Patent Document 2) opens a water supply valve when a water supply abnormality is detected by an ON operation of an overflow switch that detects the water level of a cleaning tank, It has been disclosed that by performing a drainage operation of the cleaning / drainage pump, it is possible to eliminate a closing abnormality caused by a foreign matter biting in the water supply valve.
Japanese Patent No. 3293256 (Japanese Patent Laid-Open No. 7-59713) JP 2000-18429 A

When the first operation of the dishwasher installed in the system kitchen is started with foreign matter remaining in the water supply pipe as described above, the probability that the foreign material will bite into the water supply valve increases and it is completely closed. It becomes impossible to speak. In such a case, the water supply valve leakage detection system provided in the dishwasher can detect the abnormality and execute the drainage operation, but there may be unexpected water leakage outside the machine. is there.
To prevent this, when starting the first operation after installing the dishwasher in the construction (installation) manual and instruction manual, be sure to carry out the water draining operation during the trial run. Although it is conceivable to give an instruction, in reality, there is no guarantee that the contractor or the user will surely execute the water discarding operation.
In addition, the dishwashers described in Patent Documents 1 and 2 also have the same problem as described above if the water discarding operation during the trial run is not performed after installation, and the water supply valve is completely closed. When a state where the valve cannot be operated occurs, it is possible to notify the failure of the water supply valve, but there is still a possibility that water leakage to the outside of the machine may occur.

  Therefore, the technical problem of the present invention is that, in order to solve the above problems, when the dishwasher is installed in the system kitchen and the power cord is plugged into the outlet, Prior to executing the operation, the control means of the dishwasher should be devised so that the water draining operation during the trial operation can be executed without fail.

The dishwasher according to the present invention is basically installed in the system kitchen and reliably performs the water discarding operation when the first operation is performed.
The means taken to solve the above problems will be described below together with the action.
(1) A dishwasher according to the present invention (corresponding to claim 1) includes a washing tank for storing dishes, a water supply means having a water supply valve for supplying cleaning water into the washing tank, Water level detection means for detecting a predetermined water level of cleaning water, cleaning means for injecting cleaning water into the cleaning tank, drainage means for draining the cleaning water from the cleaning tank, water supply means, cleaning means, and drainage means The following (a) and (b) are based on the premise of a dishwasher provided with a control means for controlling and cleaning the dishes in the washing tank.
(A) The control means comprises a test run control means,
(B) when the dishwasher is installed performs first operation after the power is turned on, water is supplied into the cleaning tank by the water supply means, automatically commissioning to perform water discarded operation to drain from the cleaning tank by the waste water means In this first operation, foreign matter that enters the water supply valve is discharged out of the machine, and it is registered that the water discarding operation by the trial operation has been completed, and the water discarding operation is executed in the second and subsequent operations. Don't do it.

With this configuration, when the first operation is performed after installing the dishwasher in the system kitchen, the water supply valve of the water supply means is opened to supply water into the cleaning tank, and the water supplied into the cleaning tank is supplied. Since the water draining operation for draining water is automatically performed by the drainage means, foreign matters such as metal powder, dust, and rust present in the water supply pipe can be reliably discharged together with water.
In this way, foreign substances in the water supply pipe can be reliably discharged during the first operation after the installation of the dishwasher, so that foreign substances can be caught in the seal part of the water supply valve during the normal operation of the dishwasher thereafter. Therefore, it is possible to prevent the occurrence of an unexpected water leak, and high reliability of the user for the product can be obtained.
In addition, when the dishwasher is relocated and reinstalled, or when the power breaker is dropped and not used for a long time and then reused, foreign matter such as metal powder, dust, rust, etc. in the water supply pipe The situation is the same as when the dishwasher was first installed, so the first operation after re-installation and the first operation after reuse for a long period of time are not installed. It is included in the first driving after.
Such a water draining operation is executed only once when the first operation after the dishwasher is installed (the first operation after the re-installation or the first operation after the reuse after a long period of non-use). In addition, since it is not performed in the subsequent operation, it does not use extra water or electric power, and is energy saving and economical.
The above-mentioned “water discarding operation” is an operation intended to discharge water accumulated in the water supply pipe through the dishwasher by supplying water into the washing tub of the dishwasher and draining it. I mean. Therefore, this “water discarding operation” is not limited to simply supplying water and draining, but for example, using a “pre-washing course” in which each operation of water supply-washing-drainage is repeatedly performed, This includes cases where water is discharged.

(2) In the dishwasher, the water discarding operation can be executed a plurality of times. (Corresponding to claim 2)
According to such a configuration, the predetermined amount of water to be discharged from the water supply pipe can be discharged by performing the water discarding operation in units of the specified amount of washing water a plurality of times, so that foreign substances present in the water supply pipe can be removed. It is possible to remove.
The “specified amount of cleaning water” means that the water supply valve 19 is opened and water is supplied into the cleaning tank 11, the water level in the cleaning tank reaches the cleaning water level (the water level detector 21 is turned on), This is the amount of cleaning water supplied into the cleaning tank 11 when the water supply valve 19 is closed.

(3) Further, in the dishwasher, the water discarding operation can be performed using a predetermined operation course in which each of the water supply / washing / drainage operations is repeated. (Corresponding to claim 3)
As the predetermined operation course in such a configuration, it is necessary to be an operation course using water, and it is advantageous that the required time is shorter. Therefore, a prewash course in which water supply-washing-drainage is repeated is used. Is the best. In this way, if the pre-wash course is used to perform the water-discarding operation, the water-discarding operation can be performed as compared to other operation courses, for example, the case of using the standard course for performing the cleaning process, the rinsing process, and the drying process. Spend less time, water and power.

(4) In the dishwasher, the water discarding operation can be performed by a single opening / closing operation of the water supply valve. (Corresponding to claim 4)
According to such a configuration, since the water discarding operation can be executed by one opening / closing operation of the water supply valve, compared to the case where the water discarding operation is performed by opening / closing the water supply valve a plurality of times, the water discarding operation can be performed in a short time. The water discarding operation can be terminated.

(5) Further, in the dishwasher, after the water supply valve is opened and water supply is started, before the water supply valve is closed and the water supply is stopped, drainage by the drainage means is started, so that the water supply valve 1 More than the specified amount of washing water can be thrown away by opening and closing operations once. (Corresponding to claim 5)
According to such a configuration, a predetermined amount of water to be discharged from the water supply pipe can be supplied into the cleaning tank by a single opening / closing operation of the water supply valve, so that all foreign matters in the water supply pipe are discharged. The valve can be closed later, and the valve is not closed when the foreign matter from the water supply pipe flows through the water supply valve, and the foreign matter can be prevented from biting into the water supply valve.

As described above, according to the dishwasher of the present invention, the foreign matter in the water supply pipe can be surely discharged during the first operation after the installation of the dishwasher. It is possible to prevent an unexpected water leak without causing an abnormality of the water supply valve in which foreign matter is caught in the seal portion of the valve, and high reliability of the user for the product can be obtained.
Also, when the dishwasher is relocated and reinstalled, or when it is reused after it has not been used for a long period of time, the water draining operation is automatically performed in the same manner as when the first operation is performed after the dishwasher is installed. Therefore, not only can foreign matter in the water supply pipe be surely discharged, but also dirty residual water and slimy water in the cleaning tank can be removed.
The water discarding operation is executed only once during the initial operation of the dishwasher, and is not performed in the subsequent operation. Therefore, excess water and electric power are not used, and it is energy saving and economical.

  Below, the dishwasher by Example 1- Example 3 of this invention is demonstrated based on FIGS. 1-4. Each of these embodiments is different in respect of the water discarding operation during the trial operation for discharging foreign matter in the water supply pipe, and the other points are common to each other.

Initially, the dishwasher by Example 1 of this invention is demonstrated, referring FIG.1 and FIG.2. FIG. 1 is a longitudinal sectional view for explaining a dishwasher and a block diagram of a control unit, and FIG. 2 is a flowchart for explaining a water discarding operation during a trial run in the dishwasher.
[Dishwasher configuration]
First, the structure of the dishwasher according to the first embodiment will be described with reference to FIG. As shown in FIG. 1A, the main body 10 includes a cleaning tank 11 that can be pulled out by a door 24 on the front side, and the dish baskets 12 and 12 are provided inside the cleaning tank 11. 'And a heater 14 are provided. The cleaning tank 11 includes a rotating means (spray nozzle) 13 and a cleaning / drainage pump 17 for cleaning dishes, a water supply valve (water supply electromagnetic valve) 19, a water supply pipe (water supply hose) 20, and the like. A water supply means for supplying water to the cleaning tank 11, a cleaning / drainage pump 17, a drain pipe (drain hose) 18, a drain trap 26, a drain check valve 27 and the like, and is stored in the cleaning tank 11. A draining means for discharging water to the outside, a drying fan 22, an exhaust port 23 formed in the door 24, and the like, and a drying means for drying the dishes in the cleaning tank 11 are attached.
In addition, although the said washing | cleaning / drainage pump 17 is a thing provided with the function of a washing | cleaning pump and a drainage pump, it is also possible to provide a dedicated washing pump and a drainage pump, respectively.

At the bottom of the washing tank 11, a water receiving part 16 including a leftover filter 15 is formed, and a cleaning / drainage pump 17 and a water level detector 21 are communicated with the water receiving part 16. Reference numeral 25 denotes a thermistor that detects the temperature in the washing tub 11, and reference numeral 29 denotes a water leak detection sensor that detects a water leak in the dishwasher.
Further, an operation unit 28 including a power switch 28a, a start / pause switch 28b, display means (not shown), and the like is provided on the front surface of the door 24. A dishwasher is provided inside the door 24. A control unit 30 is provided for controlling the operation.

As shown in FIG. 1B, the control unit 30 includes a trial operation control unit 30b in addition to the control unit 30a included in a normal dishwasher. The control means 30a controls the normal operation of the dishwasher, and the trial operation control means 30b is the first operation performed by the contractor or user (user) after the contractor installs the dishwasher in the system kitchen. It is possible to control that the water discarding operation is always performed at the time of operation and to memorize that the water discarding operation has been performed. Such a water draining operation is executed only once in the first operation after turning on the power outlet, and then executed in the second and subsequent operations unless the power cord is disconnected from the outlet or a power failure occurs. There is no need to use extra water or electricity.
In addition, if a non-volatile memory is used as a memory to store the fact that the water draining operation was performed in the first operation, the stored contents will not be erased even if a power failure occurs. Since the water discarding operation is not performed even in the operation of, it is convenient that unnecessary time, water and electric power are not wasted.
Each of the control means 30a, 30b receives signals from each sensor such as the operation unit 28, the water level detector 21, the thermistor 25, the water leak detection sensor 29, and the like, and the cleaning / drainage pump 17, the water supply valve 19, the heater 14, The dishwasher is controlled by operating the drying fan 22 and the display means.

[Dishwasher operation]
Next, the water discarding operation during the trial operation by the trial operation control means 30b and the operation during the normal operation by the control means 30a in the dishwasher of the first embodiment will be described.
(Draining operation during test operation)
First, the water draining operation during the trial run by the trial run control means 30b will be described with reference to FIG.
The trial operation control means 30b is for causing a water discarding operation to discharge foreign matter that enters the water supply valve 19 from the water supply pipe constructed by the contractor. Such a water throwing operation automatically performs operations such as water supply → drainage or water supply → washing → drainage when the contractor or user performs the first operation after installing the dishwasher in the system kitchen. By doing so, it is surely executed.
Further, the above water discarding operation is performed in the same manner when the dishwasher is moved and reinstalled, or when the power breaker is dropped without being used for a long period of time and then reused.

As shown in the flow chart of FIG. 2, the water discarding operation during the above test operation is performed when the power cord is inserted into the outlet (the power outlet is turned on) after the dishwasher is installed by the contractor (step by step). 1 (shown as “S1” in the figure. The same applies to the following steps)), and waits until the power switch 28a is turned on (step 2). Thereafter, when the power switch 28a is turned on, the process proceeds to the next step 3 to determine whether or not the operation is the first operation after the power outlet is turned on. If it is the first operation, the routine proceeds to step 4 and waits until the start switch 28b is turned on. When the start switch 28b is turned on, the process proceeds to step 5, and after the prewash course is automatically selected, the process proceeds to step 6. Note that the order of steps 4 and 5 may be reversed. If it is not the first operation in step 3 (if it is the second or later operation), the process proceeds to step 9.
In step 5 above, the pre-washing course is automatically selected, but it is possible to select another driving course as long as the driving course uses water. However, in consideration of the time required for the water discarding operation, the amount of water used, electric power, and the like, it is optimal to configure the prewash course.
When the process proceeds to step 6, the water supply valve 19 is opened and the cleaning water is supplied until the cleaning water level is reached (until the water level detector 21 is turned on). When the cleaning water reaches the cleaning water level (becomes the specified amount of cleaning water), the cleaning / drainage pump 17 is drained and drained for a predetermined time (for example, 45 seconds) (step 7). After registering the execution of the operation (step 8), the process proceeds to step 14.
In this step 14, it is determined whether or not the selected course is a pre-washing course. Here, since the pre-washing course is selected in the above step 5, the process proceeds to step 15.

Steps 15 to 20 are pre-washing courses and are one of driving courses that can be selected in course selection during normal driving. In this pre-washing course, each operation of water supply → washing → drainage is repeated twice as in the case of a conventional dishwasher.
First, the water supply valve 19 is opened and the water supply operation is performed until the cleaning water reaches the cleaning water level (step 15). When the washing water reaches the washing water level, the washing / drainage pump 17 is washed and the washing operation is performed for a predetermined time (for example, 2 minutes) (step 16), and then the washing / drainage pump 17 is switched to the draining operation. The draining operation is performed for a predetermined time (for example, 45 seconds) (step 17). Furthermore, the water supply operation is continued until the water supply valve 19 is opened again until the cleaning water level is reached (step 18), and the cleaning operation is performed for a predetermined time (for example, 1 minute) by the cleaning / drainage pump 17 (step 19). After performing the draining operation for a predetermined time (for example, 45 seconds) (step 20), the first operation after the installation is completed (step 21), the power switch 28a is turned off, and the process returns to step 2. In this step 2, it waits until the power switch 28a is turned on next time.
In this way, by performing the water discarding operation in steps 6 and 7 and the water discarding operation in the prewash course in steps 15 to 20, the water supply valve 19 is opened and a predetermined amount of water is allowed to flow out from the water supply pipe. Since it can be drained outside the machine, foreign matter that enters the water supply valve 19 can be discharged. The operation of water supply → cleaning → drainage in the pre-washing course may be performed once.
Further, in the above water discarding operation, after the water discarding operation in steps 6 and 7, the process proceeds from step 8 to step 14 to perform the water discarding operation in the prewash course (steps 15 to 20). After the water discarding operation of No. 7, it is possible to proceed directly to Step 21 from Step 8 as indicated by a dotted line and complete the first operation after installation.

(About operation during normal operation)
Next, the operation during normal operation by the control means 30a will be described with reference to FIG.
When the power switch 28a is turned on (step 2), the process proceeds to the next step 3 to determine whether or not the operation is the first after the power outlet is turned on. This time, since it is not the first operation, the process proceeds to step 9, the course selected in the previous operation is automatically selected, and the process proceeds to next step 10. In Step 10, if the driving course selection switch is not turned on, the process proceeds to Step 12, and waits until the start switch 28b is turned on.
On the other hand, in step 9 above, when the automatically selected driving course is changed to another course, or when no driving course is selected, the desired course is selected by turning on the driving course selection switch. Is selected (steps 10 and 11), and the process proceeds to step 12. In step 12, the process waits until the start switch 28b is turned on.

  When the start switch 28b is turned on in step 12, the draining operation of the cleaning / drainage pump 17 is performed for a predetermined time (for example, 45 seconds) (step 13), and the next step 14 is performed. move on. In step 14, it is determined whether or not the selected course is a prewash course. If it is a prewash course, the above-described prewash course is operated (steps 15 to 20). When the pre-washing course is completed and the operation is completed (step 21), the power switch 28a is turned off and then the process returns to step 2 and then waits in this state until the power switch 28a is turned on.

If the selected course is not a pre-washing course in Step 14, as shown in Step 22, the driving course selected in Steps 9 to 11, such as a standard course, a fast washing course, a careful course, or a drying course, etc. The operation of each of the driving courses is executed to complete the driving (step 23), the power switch 28a is turned off, the process returns to step 2, and then waits in this state until the power switch 28a is turned on.
In addition, since each operation | movement performed in each said driving course and each operation | movement of water supply, washing | cleaning, drainage, or ventilation etc. which are performed in each process are the same as that of the case of the conventional dishwasher, here Then, the explanation is omitted.

A dishwasher according to Embodiment 2 of the present invention will be described with reference to FIG. FIG. 3 is a flowchart for explaining a water discarding operation during a trial run in the dishwasher.
The dishwasher according to the second embodiment is the same as the first embodiment except that the water discarding operation in steps 6 and 7 (see FIG. 2) is omitted from the water discarding operation during the trial operation. Since this is the same as that of the first embodiment, the second embodiment will be described with a focus on the water discarding operation during the test run.

As shown in the flowchart of FIG. 3, in the dishwasher in the dishwasher according to the second embodiment, when the dishwasher is installed by a contractor and then the power outlet is turned on (step 30). The process waits until the power switch 28a is turned on (step 31). Thereafter, when the power switch 28a is turned on, the process proceeds to the next step 32 to determine whether or not the operation is the first operation after the power outlet is turned on. If it is the first operation, the routine proceeds to step 33 and waits until the start switch 28b is turned on. When the start switch 28b is turned on, the routine proceeds to step 34, and after the prewash course is automatically selected, the routine proceeds to step 40. Note that the order of the steps 33 and 34 may be reversed.
If it is not the first operation in step 32 (if it is the second or later operation), the process proceeds to step 35.

In step 40, it is determined whether the selected course is a prewash course. Here, since the prewash course is selected in step 34, the process proceeds to step 41. Steps 41 to 46 are pre-washing courses that can be selected in course selection during normal operation. As described in the first embodiment (see steps 15 to 20 in FIG. 2), water supply → washing → drainage Each operation is repeated twice, and the water discarding operation is executed. When the second drainage operation of the pre-wash course is completed (step 46), it is registered that the first operation after installation is executed (step 47), and the operation is completed (step 48), and the power switch 28a After turning OFF, the process returns to step 31, and then waits until the power switch 28a is turned ON.
In this way, by performing the water discarding operation according to the pre-washing course in steps 41 to 46 described above, the water supply valve 19 is opened, a predetermined amount of water is allowed to flow out from the water supply pipe, and the water can be drained outside the apparatus. As a result, foreign matter that enters the water supply valve 19 can be discharged.
In addition, the operation at the time of normal operation in the dishwasher of the second embodiment is the same as that of the first embodiment (steps 2, 3, and 3 in FIG. 2) as shown in steps 31, 32, and 35 to 50 (excluding step 47) in FIG. , 9 to 23), the description thereof is omitted here.

A dishwasher according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 4 is a flowchart for explaining a water discarding operation during a trial run in the dishwasher.
Since the dishwasher of this Example 3 changes the water discarding operation (refer FIG. 2) by the steps 6-8 in the said Example 1, since the other than that structure is the same as Example 1, The third embodiment will be described focusing on the water discarding operation during the trial run.

  As shown in the flowchart of FIG. 4, in the dishwasher of the third embodiment, when the dishwasher is installed by a contractor, the power outlet is turned on (step 60). The process waits until the power switch 28a is turned on (step 61). Thereafter, when the power switch 28a is turned on, the process proceeds to the next step 62 to determine whether or not the operation is the first operation after the power outlet is turned on. If it is the first operation, the process proceeds to step 63 and waits until the start switch 28b is turned on. If it is not the first operation in step 62 (if it is the second or later operation), the process proceeds to step 73.

When the start switch 28b is turned on in step 63, the process proceeds to step 64, where the water supply valve 19 is opened and water supply to the cleaning tank 11 is started. This water supply is continued until the cleaning water reaches the cleaning water level (until the water level detector 21 is turned on) (step 65). When the cleaning water level is reached (the specified amount of cleaning water is reached), the cleaning / drainage pump 17 is drained. The operation is started and drainage is started (step 66). When a predetermined time (for example, 2 minutes) elapses from the start of the drainage (step 67), the water supply valve 19 is closed to stop the supply of cleaning water (step 68). When a predetermined time (for example, 45 seconds) elapses after the water supply is stopped (step 69), the drainage operation of the cleaning / drainage pump 17 is stopped and the drainage is stopped (step 70). Next, proceeding to step 71, registering that the first operation after installation has been executed (step 71), completing the operation (step 72), turning off the power switch 28a, and then returning to step 61, Next, it waits until the power switch 28a is turned on.
The start of drainage in steps 65 and 66 is executed when the wash water reaches the wash water level. The wash water is washed by measuring the elapsed time since the start of water supply in step 64. Draining can be started before reaching the water level.

In this way, by performing the water discarding operation in steps 64 to 70 described above, the water supply valve 19 can be opened and a predetermined amount of water can be discharged from the water supply pipe and drained out of the apparatus. It becomes possible to discharge the foreign matter that enters the battery. Further, when a predetermined amount of water is allowed to flow out from the water supply pipe, the water supply valve 19 is opened and closed only once, so that the probability that a foreign object is bitten into the water supply valve 19 is extremely reduced.
Further, the above water discarding operation is performed in steps 64 to 70 and the operation is completed (step 72). After such a water discarding operation, the process proceeds from step 71 to steps 79 to 84 as indicated by a dotted line. It is also possible to complete the first operation after installation (step 85) after performing the water discarding operation by the pre-washing course.
In addition, as for the operation | movement at the time of normal driving | operation in the dishwasher of this Example 3, as shown to step 61, 62, 73-87 of a figure, Example 1 (refer step 2, 3, 9-23 of FIG. 2). Therefore, the description thereof is omitted here.

In the dishwashers of the above-described first to third embodiments, when the power outlet is turned on and the power switch 28a is turned on and the start switch 28b is turned on, the first operation for performing the water draining operation is started. However, this configuration is not always necessary, and it is possible to automatically start the first operation immediately after the power outlet is turned on.
In such a configuration, immediately after the power outlet is turned on, the first operation is suddenly started to surprise the contractor and the user.

These are the schematic diagrams explaining the dishwasher by Example 1 of this invention, (a) is a whole longitudinal cross-sectional view, (b) is a block diagram of a control part. These are the flowcharts explaining the water throwing-out operation | movement at the time of the trial run of the dishwasher by Example 1 of this invention. These are the flowcharts explaining the water throwing-out operation | movement at the time of the trial run of the dishwasher by Example 2 of this invention. These are the flowcharts explaining the water throwing-out operation | movement at the time of the trial run of the dishwasher by Example 3 of this invention. These are explanatory drawings regarding abnormality detection of a water supply valve in a conventional dishwasher, (a) is a schematic diagram of the dishwasher, and (b) is a flowchart of abnormality detection processing of the water supply valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... (Dishwasher) main body 11 ... Washing tank 13 ... Rotating nozzle (washing nozzle) 17 ... Cleaning / drainage pump 18 ... Drain pipe (drainage hose) 19 ... Water supply valve (water supply solenoid valve)
DESCRIPTION OF SYMBOLS 20 ... Water supply pipe (water supply hose) 21 ... Water level detector 28 ... Operation part 28a ... Power switch 28b ... Start / temporary stop switch 30 ... Control part 30a ... Control means 30b ... Test run control means

Claims (5)

A washing tank for storing tableware,
Water supply means having a water supply valve for supplying cleaning water into the cleaning tank;
Water level detecting means for detecting a predetermined water level of the cleaning water in the cleaning tank;
Cleaning means for injecting cleaning water into the cleaning tank;
Drainage means for draining wash water from the washing tank;
In the dishwasher comprising the control means for controlling the water supply means, the washing means, and the drainage means to wash and rinse the dishes in the washing tank,
The control means comprises a test run control means,
When the dishwasher is installed and the first operation after turning on the power , the water supply means supplies water into the washing tank, and the drainage means performs a trial operation to automatically execute the water draining operation to drain from the washing tank. In this first operation, the foreign matter that enters the water supply valve is discharged out of the machine, and it is registered that the water discarding operation by the trial operation is completed, and the water discarding operation is not executed in the second and subsequent operations. Dishwasher featuring.   The dishwasher according to claim 1, wherein the water discarding operation is executed a plurality of times. The dishwasher according to claim 1 or 2, wherein the water discarding operation is performed using a predetermined operation course in which each of the water supply, washing, and draining operations is repeated.   The dishwasher according to claim 1, wherein the water discarding operation is performed by a single opening / closing operation of the water supply valve.   After the water supply valve is opened and water supply is started, before the water supply valve is closed and the water supply is stopped, drainage by the drainage means is started, so that a specified amount of washing water can be obtained by one opening and closing operation of the water supply valve. The dishwasher according to claim 4, wherein a greater amount of water is discarded.

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