JP3126085B2 - Dishwasher operation control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for operating a hot water supply device to fill a tank provided in a washing tank with a predetermined amount of hot water, and then operating the washing device for a predetermined time to wash dishes and the like. The present invention relates to an operation control method for a dishwasher in which a drainage device is operated for a predetermined time to discharge hot water from a tank, and particularly to an operation control for a dishwasher in which a temperature of hot water used for washing is appropriately maintained. About the method.

[0002]

2. Description of the Related Art Conventionally, in this type of dishwasher,
For example, as disclosed in JP-A-3-131221, a hot water temperature sensor is provided in a cleaning tank, a hot water supply device detects a hot water temperature filled in the tank, and when the hot water temperature is lower than a predetermined temperature, the tank is After discharging the hot water in the tank for a certain period of time, the hot water is again supplied from the hot water supply into the tank, and even if the temperature of the hot water supplied from the hot water supply is initially low,
The dishes were always washed with hot water at a predetermined temperature or higher. Further, as another method, as shown in the same publication, the temperature of the hot water supplied from the hot water supply device to the tank is detected, and when the hot water temperature is lower than a predetermined temperature, drainage is performed simultaneously with hot water supply, When the hot water temperature becomes higher than a predetermined temperature, drainage is stopped and only hot water supply is performed.

[0003]

However, in the above-mentioned conventional method, as long as the temperature of the hot water stored in the cleaning tank is lower than a predetermined temperature, the hot water in the tank is constant irrespective of the temperature of the hot water. It is discharged only for a time, and in this case, it is necessary to discharge a large amount of hot water assuming that the temperature of the hot water is low,
There is a problem that hot water is unnecessarily consumed. Also, in the latter method, not the temperature of the hot water stored in the tank,
Since the temperature of the hot water being supplied from the hot water supply device to the tank is detected, there is a problem that the detection of the hot water temperature becomes inaccurate. SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and has as its object to operate a dishwasher in which the temperature of hot water stored in a cleaning tank is accurately detected and the hot water is not wasted. It is to provide a control method.

[0004]

To achieve the above object, the present invention according to claim 1 is characterized in that a cleaning tank is provided.
A hot water supply device for externally supplying hot water into a tank provided in
The hot water in the tank is circulated and supplied into the washing tank,
A washing device for washing tableware stored in the container,
Dishwasher equipped with a drainage device for draining hot water stored in
Applies to Kiyoshi machine, and hot water control step of operating the water heater to a predetermined amount of hot water is filled in the tank, the wash control step of causing the cleaning device after the sheet <br/> hot water control stroke is activated a predetermined time in operation control method for a dishwasher comprising a discharge control step of all the hot water is drained in the tank said drainage device is operated a predetermined time after the washing control stroke, the hot water supply control before Symbol tank during stroke a water temperature detecting step for detecting the water temperature in the tank when a predetermined amount of hot water is met, the detected temperature is the detection of the operating time of the drainage device by operating the drainage device when more than a predetermined temperature Temperature
Increase it as the temperature decreases and shorten it as the temperature rises.
Te, of the hot water while draining a part of the hot water in the tank
The operation of the water heater is continued according to the amount of drainage , and
Some waste water supply to ensure a predetermined amount of hot water is filled into the tank
And a hot water control process.

A structural feature of the invention according to claim 2 is that, in addition to the method for controlling the operation of a dishwasher according to claim 1, when the tank is filled with a predetermined amount of hot water again, A hot water temperature re-detection process for re-detecting the hot water temperature in the tank;
A stop control step of stopping the operation of the dishwasher when the re-detected hot water temperature is equal to or lower than a predetermined temperature.

[0006]

According to the first aspect of the present invention, the temperature of hot water when the tank is filled to a predetermined amount is detected, and the detected hot water temperature is equal to or lower than the predetermined temperature. Sometimes, the hot water in the tank is discharged for a longer time as the detected temperature becomes lower, and hot water is replenished by the discharged amount. Thus, according to the present invention, the temperature of the hot water in the tank is directly detected, the detection of the hot water temperature becomes accurate, and the hot water is replenished by an amount corresponding to the temperature of the hot water once stored in the tank. Therefore, wasteful consumption of hot water can be avoided.

Further, in the invention according to claim 2 configured as described above, in addition to the operation of the invention according to claim 1, the temperature of the hot water in the tank does not increase even if the hot water is replenished. In such a case, the operation of the dishwasher is stopped. Thus, according to the present invention, in addition to the effect of the invention according to the first aspect, a case where hot water (water) is supplied from the hot water supply device forever but the temperature is low (for example, when the water supply device is forgotten to be operated) In the case of a failure of the hot water supply device, etc.), it is possible to prevent wasteful consumption of low-temperature hot water for a long time.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 schematically shows an entire dishwasher to which the present invention is applied. This dishwasher has a washing tank 20 housed in a box-shaped housing 10. The washing tank 20 accommodates a rack 23 on which tableware 22 to be put in and taken out through a door 21 is accommodated at a central portion thereof, and a pair of washing nozzles 24 and 25 are supported on upper and lower surfaces thereof. The cleaning nozzles 24 and 25 are provided with a circulation pump 26.
By the operation of, the cleaning water circulated and supplied from the cleaning water tank 27 formed at the bottom of the cleaning tank 20 through the circulation pipe 28 is sprayed toward the tableware 22 while rotating. A hot water temperature sensor 31 is fixed to the side wall of the cleaning hot water tank 27,
The sensor 31 detects the temperature of the cleaning water in the cleaning water tank 27 and outputs a detection signal indicating the temperature. A water supply pipe 32 is connected to a back wall 20a of the washing tank 20 at an outlet thereof. The water supply pipe 32 heats water supplied from an external water supply source and outputs hot water. Hot water is supplied to the cleaning water tank 27 via a hot water supply valve 34 connected downstream of the water heater 33.

From the circulation pipe 28, a drain pipe 35 and a sub-tank pipe 36 are branched. Drainage pipe 3
5 is provided with a drainage pump 37.
Discharges the washing water in the washing water tank 27 to the outside of the machine through the drain pipe 35 by the operation. The tip of the sub-tank pipe 36 communicates with the sub-tank 38, and a float switch 41 is accommodated in the tank 38. The float switch 41 detects that the water level of the cleaning water in the cleaning water tank 27 has reached a reference level indicating a height required for cleaning or the like, and turns on when the height of the water surface is higher than the reference level. If the water level is lower than the reference level, it is turned off.

Next, an electric control device for electrically controlling the dishwasher configured as described above will be described with reference to the drawings. FIG. 2 is a block diagram of the electric control device. This electric control device includes a start switch 42 in addition to the hot water temperature sensor 31 and the float switch 41, and a microcomputer 43 and a drive circuit 44 to which the hot water temperature sensor 31 and both switches 41, 42 are connected.
46 is provided. The start switch 42 is operated to start the operation of the dishwasher, and is provided on a panel surface (not shown). Microcomputer 43
Controls the driving circuits 44 to 46 by executing a program corresponding to the flowcharts shown in FIGS. The drive circuits 44 to 46 include a circulation pump 26 and a hot water supply valve 34.
And the drainage pump 37 is driven and controlled.

Next, the operation of the embodiment configured as described above will be described. When the user operates the start switch 42 after accommodating the rack 23 on which the tableware 22 is placed in the washing tank 21 and adding the detergent, the microcomputer 43 responds to the operation of the start switch 42 and the microcomputer 43 shown in FIG. In step 100, execution of the program is started.

After the start of the program, the microcomputer 43 proceeds to step 102 to execute a "first hot water supply routine".
Execute This “first hot water supply routine” is started in step 200 of FIG.
The hot water supply valve 34 is turned on via the drive circuit 45 until the float switch 41 is turned on. This allows
High-temperature clean hot water flows from the water heater 33 through the hot water supply valve 34 into the cleaning hot water tank 27. After the processing in step 202, the microcomputer 43 determines in step 204 whether the float switch 41 is on. If the hot water that has flowed into the cleaning hot water tank 27 does not reach the reference level due to the hot water supply, “NO” is continuously determined in step 204. When the flowing hot water reaches the reference level, "YES" in step 204.
And the program proceeds to step 206.

In step 206, the hot water temperature sensor 31
, A detection signal representing the hot water temperature T is inputted, and it is determined in step 208 whether the hot water temperature T is higher than a predetermined temperature T0 (for example, 60 ° C.). If it is determined that the detected hot water temperature T is higher than the predetermined temperature T0, "YES" is determined in step 208, the program proceeds to step 222, and the hot water supply valve 34 is turned off via the drive circuit 45 in step 222. Then, in step 224, the “first hot water supply routine” ends. Therefore, in this case, hot water supply to the cleaning water tank 27 is stopped at this time.

On the other hand, if the detected hot water temperature T is lower than the predetermined temperature T0, "NO" is determined in step 208, and the difference between the detected hot water temperature T and the predetermined temperature T0 is determined by the determination processing in steps 210 and 212. T0 is less than 10 ° C, 10-20 ° C, 2
It is determined which group the temperature is 0 ° C. or higher. If the difference T−T0 is less than 10 ° C., “YES” is determined in step 210, and the drain pump 37 is operated via the drive circuit 46 for only 5 seconds in step 214.
If the difference T−T0 is 10 to 20 ° C., step 21
At 0 and 212, it is determined as "NO" and "YES", respectively, and at step 216, the drain pump 37 is operated for only 10 seconds. If the difference T-T0 is equal to or higher than 20 ° C., both of the judgments in steps 210 and 212 are “NO”, and in step 218, the drain pump 37 is operated for 15 seconds. Thus, the drain pump 37 discharges the hot water in the cleaning water tank 27 to the outside via the drain pipe 35 for a time corresponding to each case. In this embodiment, the capacity of the drain pump 37 is set so that it takes about 30 seconds to completely drain the hot water from the cleaning hot water tank 27. Part will be drained. In addition, the drainage amount is set so as to increase as the temperature of the hot water in the cleaning hot water tank 27 decreases, and the hot water in the cleaning hot water tank 27 rises to an appropriate temperature when the high-temperature hot water is refilled accordingly. I have.

After a part of the hot water in the washing hot water tank 27 is discharged as described above, it is determined in a step 220 whether or not the float switch 41 is on as in the case of the step 204. In this case, since the hot water supply valve 34 is kept on, the float switch 41 is turned on when the amount of discharged hot water is replenished. As a result, "YES" is determined in step 220, and the program proceeds to step 222, where hot water supply valve 34 is turned off. Therefore, even if the low-temperature water (water) is initially supplied to the cleaning water tank 27 immediately after the start of the operation of the water heater 33 or due to other temporary malfunction of the water heater 33, the hot water is replenished thereafter. The temperature of the hot water in the tank 27 is always set to a high suitable temperature. In this case, the washing water tank 2
The amount of hot water discharged from the tank 27 (the amount of hot water replenished to the tank 27) is determined according to the temperature of the hot water No. 7, so that the hot water is not wasted.

After the "first hot water supply routine" is completed, the microcomputer 43 operates the circulation pump 26 via the drive circuit 44 for two minutes in step 104 of FIG.
The circulation pump 28 pumps up the hot water in the cleaning water tank 27 containing the detergent, and through the circulation pipe 28, the cleaning nozzle 24,
25, and the nozzles 24, 25 spray hot water toward the tableware while rotating. Therefore, the dishes are washed with hot water containing detergent for 2 minutes. Next, the microcomputer 43 operates the drain pump 37 via the drive circuit 46 for 30 seconds in step 106. Drainage pump 3
7 discharges all of the hot water used for cleaning in the cleaning water tank 27 to the outside via the drain pipe 35.

After the processing in step 106, the microcomputer 43 executes a "second hot water supply routine" in step 108. The details of the "second hot water supply routine" include steps 300 to 308 as shown in FIG.
The hot water supply valve 34 is turned on via the drive circuit 45 until is turned on. As a result, the cleaning water tank 27 is filled with the high-temperature water from the water heater 33 to the reference level. Next, the microcomputer 43 determines in step 110 that the circulation pump 26
Is operated via the drive circuit 44 for 30 seconds. This allows the dishes to be rinsed in hot water without detergent for 30 minutes. Next, at step 112, the drain pump 37 is operated for 30 seconds via the drive circuit 46 in the same manner as described above to discharge all of the hot water used for rinsing in the cleaning water tank 27 to the outside. In the first rinsing, it is not essential that the temperature of the rinsing water is high. Therefore, in the "second hot water supply routine" of the step 108, the maintenance of the high-temperature hot water as in the "first hot water supply routine" is performed. Control is not required.

After the processing in step 112, the microcomputer 43 executes the "first hot water supply routine" described above in step 114. Thereby, the washing water tank 2
7 is filled with fresh hot water. Next, step 11
In steps 6 and 118, the dishes are rinsed for 30 seconds as in the processing in steps 110 and 112, and all the hot water used for the rinse is discharged to the outside. According to the above control, the dishes are washed with hot water containing a detergent for 2 minutes, and rinsed twice with hot water containing no detergent (the first time is not necessarily high temperature) for 30 seconds each.

Next, a modified example of the above embodiment will be described. This modification is shown in FIG.
The apparatus of the above embodiment further includes an alarm 50 such as a buzzer and an alarm lamp connected to the microcomputer 43, and the microcomputer 43 replaces the "first hot water supply routine" of FIG. The difference is that the "hot water supply routine" is executed, and the other points are the same.

Only the parts of this modified example different from the above embodiment will be described. If "NO" in step 208 of the "first hot water supply routine" (FIG. 6), that is, if it is determined that the detected hot water temperature T is equal to or lower than the predetermined temperature T0, the microcomputer 43 operates the alarm 50 in step 230. To generate an alarm. Then, after performing the hot water replenishment process consisting of steps 210 to 220 similar to the above embodiment, in step 232, the detected hot water temperature T
Is re-input, and it is determined again in step 234 whether or not the detected hot water temperature T is higher than the predetermined temperature T0. If the detected hot water temperature T is higher than the predetermined temperature T0, at step 234, "YE
S ", the generation of the alarm is canceled in step 236, and the program proceeds to step 222 described above.

On the other hand, the hot water replenishment process also
If the detected hot water temperature T does not become higher than the predetermined temperature T0,
At step 234, “NO” is determined, and the program proceeds to step 238. In step 238, the hot water supply valve 34 is turned off via the drive circuit 45, and
, The drain pump 37 is connected to the
Run for seconds. Thus, the supply of hot water to the cleaning hot water tank 27 is stopped, and all the remaining hot water in the cleaning hot water tank 27 is discharged to the outside. Next, in step 242, all electrically operated portions of the dishwasher are stopped, and
In step 4, the execution of the program is also stopped. As a result, according to this modification, even if the water heater 33 is forgotten to operate, an abnormality occurs in the water heater system including the water heater 33, and the cleaning water tank 2
Even if the temperature of the hot water stored in 7 does not become higher than the predetermined temperature T0, the hot water (water) will not be continuously supplied to the cleaning hot water tank 27 forever.

In the above embodiment and modifications,
If the detected hot water temperature T does not become higher than the predetermined temperature T0, the detected hot water temperature T is distributed to one of the three groups, and a part of the hot water in the washing hot water tank 27 is discharged (the replenishment amount of the high-temperature hot water), that is, the drain pump The operation time of the 37 is controlled in three stages, but the group and the number of stages are appropriately determined. Further, a difference T-T0 between the detected temperature T and the predetermined temperature T0.
Is stored in the form of a table in the microcomputer 43, or a function that changes according to the difference T-T0 is defined, and the processing in steps 210 to 218 is performed instead. The operation time of the drain pump 37 may be determined from a table or by calculation according to the difference T-T0.

In the above embodiment, the oil temperature sensor 3
When the temperature of the hot water detected by step 1 is lower than the predetermined temperature, a circuit device for notifying the user of the low temperature by a lamp or the like may be added.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view schematically showing a dishwasher according to an embodiment of the present invention.

FIG. 2 is a block diagram of an electric control device for the dishwasher.

FIG. 3 is a flowchart of a “program” executed by the microcomputer of FIG. 2;

FIG. 4 is a flowchart showing details of a “first hot water supply routine” in FIG. 3;

FIG. 5 is a flowchart showing details of a “second hot water supply routine” in FIG. 3;

FIG. 6 is a flowchart illustrating a modification of the “first hot water supply routine” in FIG. 4;

[Explanation of symbols]

20 ... washing tank, 22 ... tableware, 24, 25 ... washing nozzle,
26 circulating pump, 27 cleaning water tank, 31 hot water temperature sensor, 33 water heater, 34 hot water supply valve, 37 drain pump, 38 sub tank, 41 float switch, 43
… Microcomputer

Claims (2)

(57) [Claims] 1. A hot water supply device for externally supplying hot water into a tank provided in a washing tank, and washing for circulating and supplying hot water in the tank into the washing tank to wash dishes and dishes contained in the washing tank. a device is applied to a dishwasher and a drainage device for discharging the water stored in the tank, the hot water supply control process for operating the water heater to a predetermined amount of hot water is filled in the tank, the hot water supply and cleaning control step of causing the cleaning device after the control stroke is operated for a predetermined time, the hot water in the tank the water discharge device after the wash control stroke actuates predetermined time
In operation control method for a dishwasher comprising a discharge control step of causing all drained water temperature for detecting the water temperature in the tank when hot water of a predetermined amount before Symbol tank in the hot water supply control process are satisfied A detection step, operating the drainage device when the detected temperature is equal to or lower than a predetermined temperature , and operating time of the drainage device.
Is increased according to the decrease in the detected temperature, and the detected temperature is increased.
Shorten depending on, for draining a part of the hot water in the tank
At the same time, the operation of the hot water supply device is continued according to the drainage amount of the hot water so that the tank is filled with a predetermined amount of hot water.
Operation control method of the dishwasher, characterized in that a and part drainage water heating control step for. 2. The method for controlling operation of a dishwasher according to claim 1, wherein when the tank is filled with a predetermined amount of hot water again, the temperature of the hot water in the tank is re-detected. And a stop control step of stopping the operation of the dishwasher when the re-detected hot water temperature is equal to or lower than a predetermined temperature.