JPH0822271B2 - Dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Industrial field of application) The present invention relates to a dishwasher equipped with a control device for controlling processes such as water supply, washing, and rinsing.

(Prior Art) Conventionally, in this type of dishwasher, the execution time of the washing process performed after the completion of water supply to the washing tank is conventionally performed in accordance with the dishwashing course (for example, "standard" depending on the degree of stains on the dishes, A predetermined time is set for each of the three courses "strong" and "saving". In general, when washing dishes in a washing tank, if the temperature of the water contained in the washing tank is increased, the washing action tends to become stronger. Therefore, in the above washing process, the water in the washing tank is removed by the heater. Washing is done while heating.

(Problems to be solved by the invention) However, since the water supplied into the cleaning tank is cold water or hot water, the water stored in the cleaning tank by heating the heater is not suitable for cleaning. The time required to rise to an appropriate set temperature changes depending on the feed water temperature. On the other hand, since the execution time of the cleaning process is fixed regardless of the water temperature, the remaining execution time after the water in the cleaning tank reaches the set temperature, that is, the strong cleaning time, changes. For this reason, when the temperature of the feed water is low, the intensive cleaning time becomes short and the cleaning becomes incomplete. On the other hand, when the temperature of the supplied water is high, there has been a drawback that the intensive cleaning time becomes longer than necessary and the time and power are wasted. As a solution to such a drawback, it may be possible to detect the supply water temperature to shorten the cleaning execution time when the supply water temperature is high and to control the cleaning execution time to be longer when the supply water temperature is low. There is. However, in the case of such a case, for example, even if the temperature of the water supply is high, the temperature of the room temperature and thus the main body of the washing machine is considerably low in winter, so it takes a relatively long time to raise the temperature of the water in the washing tank. It takes time.
Therefore, if the cleaning execution time is simply shortened because the water temperature is high, the required cleaning time may not be obtained depending on the environmental temperature and cleaning may be incomplete, and the control described above is a sufficient solution. is not.

Therefore, an object of the present invention is to set the execution time of the cleaning process or the rinsing process to an appropriate time in consideration of the water supply water temperature or the environmental temperature, etc. The purpose is to provide a dishwasher that can prevent waste of money.

[Structure of the Invention] (Means for Solving the Problems) The dishwasher of the present invention is provided with a control device for controlling processes such as water supply, cleaning, and rinsing, and controls the temperature of water stored in the cleaning tank. A temperature detecting means for detecting and providing the detection result to the control device is provided, and a heater for heating the water contained in the cleaning tank is provided, and further, by the control device, the next process is continuously performed after the water supply process is completed. In addition to the execution, the execution time of the subsequent strokes is determined based on the temperature detection result when a certain time has elapsed from the end of the water supply stroke.

(Operation) The temperature of the water stored in the cleaning tank is detected by the control device and the temperature detection means when a certain time has elapsed from the end of the water supply process. In this case, since the temperature of the water immediately after being supplied to the cleaning tank and the environmental temperature become uniform during a certain period of time, if the execution time of the subsequent predetermined process is determined based on the temperature detection result, The execution time of the predetermined process such as the cleaning process or the rinsing process is set to an appropriate time.

(Example) Hereinafter, one example of the present invention will be described with reference to the drawings.

First, in FIG. 2, reference numeral 1 denotes a washing tank disposed inside the dishwasher main body 2, and the front portion of the washing tank is configured to be opened and closed by a door 3. At the bottom of the cleaning tank 1, there is provided a water reservoir 4 for containing water for performing a cleaning process and a rinsing process. Denoted at 5 and 6 are dish baskets which are detachably arranged in the washing tank 1 and in which dish dishes (not shown) to be washed are stored. Reference numeral 7 denotes a water supply pipe provided on the outer side of the cleaning tank 1. One end of the water supply pipe is connected to unillustrated tap water, and the tip opening 7a is exposed to the inside of the cleaning tank 1. A water supply valve 8 is provided in the middle of the water supply pipe 7, and the water supply valve 8 is opened to wash water from the tap water through the water supply pipe 7 from the tip end port 7a in the energized state. It is designed to be supplied into the tank 1. 9,
Reference numerals 9 are spray arms arranged below the cleaning tank 1. Reference numeral 10 denotes a pump arranged in the water reservoir 4, which is driven by a drive motor 11 through a belt transmission mechanism 12 to rotate in the forward and reverse directions, and sucks the water in the water reservoir 4 during the forward rotation. This is applied as pressure water to the injection arms 9 and 9 via the pipes 13 and 13, and when reversely rotated, the water in the water reservoir 4 is sucked and discharged to the outside via a drain pipe not shown. ing. Reference numeral 14 is a sheathed heater, which is a heating heater disposed at the inner bottom of the cleaning tank 1. This heats the water in the water reservoir 4 to perform hot water cleaning or hot water rinsing.
The tableware is dried after washing and rinsing. Further, an intake pipe (not shown) is provided at the outer bottom of the cleaning tank 1, and the tip of this intake pipe is exposed to the water reservoir 4 so that the outside air is discharged during the drying operation by the sheath heater 14. Is introduced into the cleaning tank 1. Now, reference numeral 15 is a control device composed of, for example, a microcomputer, which is arranged on the lower front surface side in the dishwasher main body 2.
16 is a thermistor which is a temperature detecting means, which is the washing tank 1
The temperature of the water contained in the water reservoir 4 is detected at the outer bottom of the.

Then, as shown in the outline of the electrical configuration in FIG. 3, the control device 15 operates in accordance with a predetermined cleaning control program.
The water supply valve 8 and the sheath heater 14 are controlled to be turned off and on,
A control signal is supplied to the drive circuit 17 to rotate the drive motor 11 forward and backward appropriately. Further, the control device 15 is adapted to receive the temperature detection signal Sa from the thermistor 16.

Next, the outline of the control contents of the control device 15 will be described with reference to FIGS. 1, 4, 5, and 6. In this case, when performing the cleaning operation, the control device 15 continuously executes the steps shown in FIG. 1, such as water supply, cleaning, drainage, water supply, rinsing, ..., Hot water rinsing, draining, and drying. Here, (I), (II), and (III) in FIG. 1 show stroke progress patterns in which the cleaning stroke and the hot-water slide stroke have different execution times.

First, with the tableware stored in the tableware baskets 5 and 6, the tableware baskets 5 and 6 are placed in the cleaning tank 1, and the detergent necessary for one cleaning is put in the cleaning tank 1. By operating a start switch (not shown), a dish washing course as shown in FIG. 1 is started. That is, in the first water supply stroke, the water supply valve 8 is opened and the water reservoir 4 of the cleaning tank 1 is
Is supplied with a predetermined amount of water. After that, the washing process is executed. Here, the drive motor 11 is energized to drive the pump 10 to rotate forward, and the water in the water reservoir 4 is jetted from the jet arms 9 and 9 toward the dishes. The detergent washing operation is started. In this washing process, the water in the water reservoir 4 is heated by the sheath heater 14 to a temperature suitable for washing, and the detergent washing operation is performed with warm water to effectively wash off the stains on the dishes. It The setting control of the execution time of such a cleaning process will be described later.

When the above washing and washing operation is completed, the drive motor
The pump 11 is driven in reverse so that the pump 11 is rotated in the reverse direction so that the water in the water reservoir 4, that is, the dirty detergent solution is sucked and discharged through the drain pipe (drain stroke), and then the rinse operation is performed. Transition.

In this rinsing operation, the same operation as the above-mentioned detergent washing is performed without using detergent. First, the water supply step is executed to supply a predetermined amount of water into the cleaning tank 1. After this, a rinsing stroke is carried out, where the pump
10 is driven and the water in the cleaning tank 1 is sprayed from the spraying arms 9, 9 to perform the rinse operation with fresh water. Then, the drainage process is executed and the water in the cleaning tank 1 is discharged by the pump 10. After such a rinsing operation is repeated three times, a hot water rinsing operation is performed. In this hot water rinsing operation, first, a water supply step is executed to supply a predetermined amount of water into the cleaning tank 1. Be done. After this,
A hot water rinsing step is executed, in which the pump 10 is driven to inject the water in the cleaning tank 1 from the injection arms 9 and 9 to perform a rinsing operation, and at the same time, the water in the water reservoir 4 is supplied by the sheath heater 14. Is heated to the state of hot water, and the hot water disinfects the dishes and heats the dishes to efficiently perform the next drying operation. The setting control of the execution time of the hot water rinsing process will be described later.

After the hot water rinsing operation, the drainage process is executed and the water in the cleaning tank 1 is discharged by the pump 10. Then, the tableware drying process is subsequently executed. Here, the sheath heater 14 is energized and the tableware is heated by the heat generation to perform the tableware drying operation.

Now, as to the setting of the execution time in the above-mentioned cleaning process, the control device 15 detects the temperature of the water contained in the cleaning tank 1 at the time when a fixed time, for example, 5 minutes has elapsed from the end of the water supply process. Based on the temperature detection signal Sa which is the detection result from the
~ Determine like III.

I. When the water temperature is 35 ° C or lower after 5 minutes, set the execution time to 1
8 minutes II. Running time is 15 minutes when the water temperature is 35 ℃ to 50 ℃ after 5 minutes III. Running time is 12 minutes when the water temperature is 50 ℃ or higher after 5 minutes. Regarding the execution time in the rinsing process as well, based on the temperature detection signal Sa which is the detection result of the temperature of the water stored in the cleaning tank 1 at the time when 5 minutes have passed from the end of the water supply process described above, Is decided.

I. When the water temperature is 35 ° C or lower after 5 minutes, set the execution time to 1
1 minute II. When the temperature of the water after 5 minutes is 35 ℃ to 50 ℃, the execution time is 9 minutes. III. When the temperature of the water after 50 minutes is 50 ℃ or more, the execution time is 7 minutes. An example of specific selection and setting of the execution time of the cleaning process will be described with reference to FIGS. 4 to 6.

FIG. 4 shows that when the environmental temperature, that is, the temperature of the dishwasher main body 2 is low (room temperature is 20 ° C.), and the temperature of the water supplied into the cleaning bath 1 is 20 ° C. It shows the temperature change of water. The alternate long and short dash line indicates the thermistor 16
Shows the temperature detected by. In FIG. 4,
Water supply is started at point (a), and water supply is completed and cleaning is started at point (b). That is, from the point (b), the heating of the water by the sheath heater 14 is started and the detergent washing by the pump 10 is started. Then, at the point (C), which is the time point after 5 minutes have elapsed, the temperature of the water in the cleaning tank 1 is 35 ° C. or lower, so the execution time of the cleaning process is set to 18 minutes. After this, the temperature of the water is the most suitable temperature for washing, for example,
The temperature is raised to about 60 ° C (d) point, and the detergent washing operation is executed up to the (e) point while maintaining this temperature.

FIG. 5 shows a case where the environmental temperature, that is, the temperature of the dishwasher main body 2 is high (when the second dishwashing is performed immediately after the first dishwashing and the drying operation of the dishes is performed, It shows the temperature change of the water stored in the cleaning tank 1 when the temperature of the water supplied to the cleaning tank 1 is 20 ° C. and the temperature is about 60 ° C.). The broken line shows the change in the feed water temperature. In this case, as shown in FIG. 5, when the water supply is started at the point (a), the temperature of the cleaning tank 1 drops sharply, but after the water supply is completed at the point (b),
Heat accumulated in the dishwasher main body 2 itself and the sheath heater 14
The temperature of the water in the cleaning tank 1 rapidly rises due to the heating by. Then, when the temperature in the cleaning tank 1 is made uniform, the temperature of the water thereafter rises at substantially the same rate of increase as in the case of FIG. Therefore, at the point (c) when 5 minutes have elapsed, the temperature of the water is within the range of 35 ° C. to 50 ° C., so the execution time of the cleaning process is set to 15 minutes.

In the case of FIG. 5, if the execution time of the cleaning process is set on the basis of the temperature (B) at the end of water supply, that is, the temperature detected by the thermistor 16 at the start of the cleaning process, the detected temperature will be about 30.
Since it is ℃, it is below 35 ℃
Set as minutes. Therefore, as described above, the cleaning time becomes longer compared to the actually required execution time of 15 minutes, and
The energization time, that is, the electric power is wasted.

FIG. 6 shows that when the environmental temperature, that is, the temperature of the dishwasher main body 2 is low (room temperature is 20 ° C.), and the temperature of the water supplied into the cleaning bath 1 is 60 ° C. It shows the temperature change of water. In this case, as shown in FIG. 6, when the water supply is started at the point (a), the temperature of the water in the cleaning tank 1 rapidly rises due to the high temperature of the water supply and the heating by the sheath heater 14. Then, when the temperature in the cleaning tank 1 is made uniform, the temperature of the water thereafter rises at substantially the same rate of increase as in the case of FIG. Therefore, at the point (C) when 5 minutes have elapsed, the temperature of the water is 50 ° C. or higher, so the execution time of the cleaning process is set to 12 minutes.

In the case of FIG. 6, if the execution time of the cleaning process is set based on the temperature (B) at the end of water supply, that is, the temperature detected by the thermistor 16 at the start of the cleaning process, the detected temperature is about 28
Since it is ℃, it is below 35 ℃
Set as minutes. Therefore, as described above, the cleaning time is longer than the actual required execution time of 12 minutes, and
The energization time, that is, the electric power is wasted.

According to this embodiment having such a configuration, the control device 15 executes the cleaning process or the hot water rinsing process based on the detection result of the temperature of the water in the cleaning tank 1 at the time of 5 minutes after the end of the water supply process. Since the time was decided, the cleaning tank 1
Since the temperature of the water in a state where the temperature inside is uniform becomes the criterion for judging the execution time of the stroke, unlike the conventional case, the ambient temperature such as room temperature or the temperature of the dishwasher main body 2 is considered in addition to the water temperature of the water supply. The cleaning process or the hot water rinsing process can be performed at an appropriate time. Therefore,
Insufficient cleaning or unnecessary cleaning time can be prevented, and power can be saved.

In the above embodiment, the execution time of the cleaning process or the hot water rinsing process is selectively set in three stages based on the detected temperature result of the water in the cleaning tank 1 5 minutes after the end of the water supply process. However, the execution time is not limited to this, and the execution time may be set in four stages or more, or the execution time may be continuously set according to the following formula.

Execution time [minutes] = 5 + 60 / α + β where α = (temperature change due to sheath heater) [° C./min], β = (time required for cleaning at 60 ° C.) [min] In the above embodiment, Although each execution time of the cleaning process and the hot water rinsing process is determined based on the temperature detection result at the time point when 5 minutes have elapsed from the end of the water supply process of
Instead of this, in the cleaning process and the hot water rinsing process, the respective execution times of the cleaning process and the hot water rinsing process are determined based on the temperature detection results at the time point 5 minutes after the end of the water supply process immediately before the process start. Is also good.

Besides, the present invention is not limited to the above-mentioned embodiment, and it is not necessary to fix the fixed time from the end of the water supply process to 5 minutes, and this fixed time may be appropriately set.

[Effects of the Invention] As is apparent from the above description, the present invention causes the control device to continuously execute the next stroke after the end of the water supply stroke, and the cleaning by the temperature detecting means at the time when a certain time has elapsed from the end of the water feed stroke. Since the execution time of the subsequent strokes is determined based on the detection result of the temperature of the water stored in the tank, the cleaning stroke or rinsing stroke is executed in consideration of the feed water temperature or the environmental temperature. It is possible to set the time to an appropriate time, and it is possible to prevent insufficient cleaning and to prevent waste of time and electric power.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a view showing a cleaning operation in different stroke progression patterns, FIG. 2 is an overall vertical sectional view, FIG. 3 is a block diagram, and FIGS. FIG. 6 is a characteristic diagram showing a temperature change of water contained in the cleaning tank in different states. In the drawing, 1 is a washing tank, 2 is a dishwasher main body, 14 is a sheath heater, 15 is a control device, 16 thermistors (temperature detection means)
Indicates.

Claims (1)

[Claims] 1. A controller for controlling strokes of water supply, cleaning, rinsing, etc .; temperature detecting means for detecting the temperature of water contained in the cleaning tank and giving the detection result to the controller; and the cleaning tank. And a heater for heating the water contained therein, wherein the control device continuously executes the next stroke after the end of the water supply stroke, and the temperature detection result at a certain time after the end of the water feed stroke. A dishwasher characterized in that the execution time of the subsequent steps is determined based on the above.