JP3141463B2 - dishwasher - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher for washing dishes.

[0002]

2. Description of the Related Art Recently, a dishwasher has been proposed in which the capacity of the dishwasher put into the dishwasher is simply determined, and the operation time is controlled more finely according to the capacity.

[0003] A conventional dishwasher will be described below. FIG. 7 is a sectional view of a conventional dishwasher. In FIG. 7, reference numeral 1 denotes a washing tank for storing tableware 2 therein and storing washing water at the bottom, and reference numeral 3 denotes a rotatable instruction tableware 2.
A washing pump 4 for ejecting washing water toward the washing nozzle 4 is a washing pump for sending washing water to the washing nozzle 3, and the washing pump 4 is driven by a motor 5. Reference numeral 6 denotes an underframe for supporting the cleaning tank 1, and reference numeral 7 denotes a heater disposed at the bottom of the cleaning tank 1 for heating the cleaning water. Reference numeral 8 denotes a thermistor attached to the bottom of the cleaning tank 1 so as to be in close contact with the outside. Reference numeral 9 denotes a blower fan for sending outside air into the washing tank 1, and the air in the washing tank 1 is discharged from the exhaust port 10 to the outside of the machine.

The operation of the dishwasher configured as described above will be described below. User is tableware 2
Is placed in the basket 11, is stored in the washing tank 1, and after the detergent is put into operation, first, a predetermined amount of tap water is supplied to the bottom of the washing tank 1. Then, the motor 5 and the heater 7 are energized, and the cleaning water is spouted from the cleaning nozzle 3 toward the tableware 2 by the cleaning pump 4 while being heated. At this time, the temperature of the washing water is detected by the thermistor 8, and the control means 12 keeps track of the temperature of the washing water. When the temperature of the cleaning water reaches a predetermined temperature and a predetermined time has elapsed from the start of the cleaning, the control unit 12 ends the cleaning process and once drains the cleaning water. Next, tap water is newly supplied, and the same operation as in the above-described washing step is performed for several minutes to drain the water. After repeating this rinsing step several times, the same operation as a cleaning step called a heating rinsing step is performed, and when the temperature reaches a predetermined temperature, the operation is finished and drained. Lastly, the blower fan 9 is operated to discharge the steam in the washing tank 1 to the outside of the apparatus, and at the same time, the heater 7 is intermittently energized to heat the tableware 2 to dry the attached water droplets.

[0005] For detecting the capacity of tableware, the degree of temperature rise of the washing water in the washing step is examined to change the operating time of each of the washing, rinsing and drying steps according to the degree. In other words, when the input value of the heater 7 is constant, if the tableware capacity is small, the heat capacity is reduced accordingly, and the temperature of the washing water rises quickly as shown in FIG. Actually, the control means 12 measures the time dt during which the detected temperature of the thermistor 8 rises from T1 to T2, and attempts to determine the capacity of the tableware based on this time dt. In general, when the tableware capacity is small, the washing water spouted from the washing nozzle 3 often hits the tableware, so that the washing can be performed well. The same can be said for drying.Conversely, if the operating time is shortened accordingly, constant washing performance and drying performance can always be obtained regardless of the tableware capacity, and at the same time energy saving and time saving can be achieved. is there.

[0006]

However, in the above-mentioned conventional configuration, the temperature rise time of the washing water is greatly affected by the value of the power supply voltage around the dishwasher.
For example, in the case of the low voltage (85 V) and the high voltage (115 V), the difference between the actual temperature rise time of the cleaning water due to the heater heating and the temperature rise time of the cleaning water in the standard state (100 V) is large. In many cases, the difference in the temperature rise time due to the difference in the capacity of the tableware in the state is larger than that of the tableware, and there is a problem that the capacity of the tableware cannot be accurately determined.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has a means for correcting the temperature rise time of washing water by heating a heater without being affected by the power supply voltage in an environment where a dishwasher is installed. A first object is to provide a dishwasher having the same.

A second object is to detect a power supply voltage value stably even when the power supply voltage value fluctuates under various use conditions of the dishwasher.

It is a third object of the present invention to stably detect the power supply voltage value even in an environment where the power supply voltage situation is particularly bad, such as frequent instantaneous power failures.

[0010] In addition, power may be lost due to a circuit failure or some other factor.
A fourth object is to appropriately determine the capacity of tableware even when the value of the source voltage cannot be detected .

[0011]

In order to achieve the first object, a dishwasher according to the present invention comprises: a washing tank for storing dishes;
A washing nozzle for ejecting washing water toward tableware, a washing pump unit for sending washing water collected in the washing tank to the washing nozzle, a motor for driving the washing pump unit, and a heater for heating the washing water; Temperature detection means for detecting the temperature of the washing water, power supply voltage detection means for detecting the voltage value of the power supply,
A series of sequential operations of washing, rinsing, and drying of the dishes are controlled, and the temperature is detected by the temperature detecting means in the washing process.
Length of temperature rise time of washing water in specified temperature section
And control means for determining the dishes amount by short, this control
The means determines the amount of tableware according to the difference between the power supply voltage value detected by the power supply voltage detection means and the rated power supply voltage value.
Make a correction, and according to the corrected tableware amount, heat the heater.
The time of the accompanying cleaning step is changed .

In order to achieve the second object, a dishwasher according to the present invention comprises a washing tank for storing dishes, a washing nozzle for jetting washing water toward the dishes, and washing water stored in the washing tank. Pump for feeding the cleaning water to the cleaning nozzle, a motor for driving the cleaning pump, a heater for heating the cleaning water, temperature detecting means for detecting the temperature of the cleaning water, and power supply voltage detecting for detecting the voltage value of the power supply Means and a series of sequential operations of washing, rinsing, and drying steps of the tableware are controlled, and the temperature detection is performed.
When the temperature rises in the predetermined temperature section detected by the output means
And a control means for determining the dishes amount by the length between a storage means for storing a supply voltage detected by the voltage detecting means at every predetermined time, the control unit, the storage means
Recalls a predetermined number of power supply voltage values stored at predetermined time intervals
An average value of the predetermined number of power supply voltage values is calculated, and the average value of the power supply voltage values is calculated according to a difference between the average power supply voltage value and the rated power supply voltage value.
Correct the determination of the quantity of dishes, and according to the corrected quantity of dishes,
This is a configuration in which the time of the cleaning step involving heating of the data is changed .

In order to achieve the third object, a dishwasher according to the present invention comprises a washing tank for storing dishes, a washing nozzle for jetting washing water toward the dishes, and a washing water stored in the washing tank. Pump for feeding the cleaning water to the cleaning nozzle, a motor for driving the cleaning pump, a heater for heating the cleaning water, temperature detecting means for detecting the temperature of the cleaning water, and power supply voltage detecting for detecting the voltage value of the power supply Means and a series of sequential operations of washing, rinsing, and drying steps of the tableware are controlled, and the temperature detection is performed.
When the temperature rises in the predetermined temperature section detected by the output means
And control means for determining the dishes amount by the length between the power supply voltage value for each predetermined time detected by said voltage detecting means, double
Comprising calculating means for performing a ranking to a predetermined voltage value of the number, and storage means for storing the occurrence rate in accordance with the rank or number of occurrences, the control means stores is in said storage means
Of the power supply voltage values obtained, the power supply voltage value of the rank with the highest detection degree is regarded as the true power supply voltage value, and this true power supply voltage value and
Correct the judgment of the amount of tableware according to the difference from the rated power supply voltage value
Then, according to the corrected tableware amount, the heating of the heater is
The cleaning time is changed .

According to a fourth aspect of the present invention, there is provided a dishwasher comprising: a washing tank for accommodating dishes, a washing nozzle for jetting washing water toward the dishes, and a washing water stored in the washing tank. Pump for feeding the cleaning water to the cleaning nozzle, a motor for driving the cleaning pump, a heater for heating the cleaning water, temperature detecting means for detecting the temperature of the cleaning water, and power supply voltage detecting for detecting the voltage value of the power supply Means and a series of sequential operations of washing, rinsing, and drying steps of the tableware are controlled, and the temperature detection is performed.
When the temperature rises in the predetermined temperature section detected by the output means
And control means for determining the dishes amount by the length between the front
The control means, when the power supply voltage value detected by the voltage detection means is less than or exceeds a predetermined power supply voltage value range set in advance, sets the tableware amount to a maximum.
Amount, and according to the determination, the heater is heated.
The time of the cleaning step is changed .

[0015]

With this configuration, the value of the power supply voltage in the environment where the dishwasher is actually installed is detected, and the correction time value corresponding to the difference between this value and the power supply voltage value in the standard state is actually determined by the washing water. Is added to or subtracted from the time required for heating the heater in a predetermined temperature section. The corrected temperature rise time obtained in this way can be treated equivalently to the value of the temperature rise time measured in the standard state, and therefore, a more accurate tableware quantity can be determined using this.

Next, the detected power supply voltage value is stored for each predetermined time, and using this, the average value of the power supply voltage values in the past predetermined elapsed time is calculated for each predetermined time, and this is used as the latest power supply voltage. By adopting it as a value, it is possible to stably detect the power supply voltage value even when the power supply voltage value fluctuates under various use conditions, and thus to accurately determine the amount of tableware. .

Further, the detected power supply voltage values are classified into ranks for each predetermined voltage value, and the degree of occurrence or the number of occurrences according to the rank is stored. By adopting the power supply voltage value of a higher rank as the latest power supply voltage value, the power supply voltage value can be detected stably even in an environment where the power supply voltage situation is particularly bad, such as frequent instantaneous power failures. is there.

If the detected power supply voltage value is less than or exceeds a predetermined power supply voltage value range, the control means for uniquely determining the amount of tableware is used to prevent the failure of the circuit. Even if the value of the power supply voltage cannot be detected for some reason or the like, the capacity of the tableware can be properly determined.

[0019]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a washing tank for accommodating dishes 2 therein and for storing washing water at the bottom, reference numeral 3 denotes a washing nozzle which is rotatably instructed to jet washing water toward the dishes 2 and reference numeral 4 denotes washing water. Is supplied to the cleaning nozzle 3, and the cleaning pump 4 is driven by a motor 5. Reference numeral 6 denotes an underframe for supporting the cleaning tank 1, and reference numeral 7 denotes a heater disposed at the bottom of the cleaning tank 1 for heating the cleaning water. Reference numeral 8 denotes a thermistor which is attached to the bottom of the washing tank 1 from the outside so as to closely detect the temperature of the washing water. Reference numeral 9 denotes a blower fan for blowing outside air into the cleaning layer 1, and the air in the cleaning tank 1 is discharged from the exhaust port 10 to the outside of the apparatus. Reference numeral 15 denotes a power supply voltage detecting means for detecting a voltage value of a power supply, and 16 denotes a control means for performing washing, rinsing, and drying of the dishes by controlling energization of the motor 5, the heater 7, and the like.

The operation of the dishwasher constructed as described above will be described below. User is tableware 2
Is placed in the basket 11, is stored in the washing tank 1, and after the detergent is put into operation, first, a predetermined amount of tap water is supplied to the bottom of the washing tank 1. Then, the motor 5 and the heater 7 are energized, and the cleaning water is spouted from the cleaning nozzle 3 toward the tableware 2 by the cleaning pump 4 while being heated. At this time, the temperature of the washing water is detected by the thermistor 8, and the control means 12 keeps track of the temperature of the washing water. When the temperature of the cleaning water reaches a predetermined temperature and a predetermined time has elapsed from the start of the cleaning, the control unit 12 ends the cleaning process and once drains the cleaning water. Next, tap water is newly supplied, and the same operation as in the above-described washing step is performed for several minutes to drain the water. After repeating this rinsing step several times, the same operation as a cleaning step called a heating rinsing step is performed, and when the temperature reaches a predetermined temperature, the operation is finished and drained. Lastly, the blower fan 9 is operated to discharge the steam in the washing tank 1 to the outside of the apparatus, and at the same time, the heater 7 is intermittently energized to heat the tableware 2 to dry the attached water droplets.

Next, the process of detecting the tableware capacity will be described with reference to the flowcharts of FIGS. 2, 3 and 4. When the cleaning step is started, a predetermined amount of water is supplied to the cleaning tank 1 in a water supply step of step 15 in FIG. 4, and in step 16 heating of the cleaning water by the heater 7 is started.
After confirming that the cleaning water has reached the predetermined temperature T1 at the thermistor 8 at step 7, the measurement of the cleaning water temperature rise time is started at step 18, and at step 19 the cleaning water is brought to the predetermined temperature T2 by the thermistor 8. When it is determined that the temperature has reached, at step 20, the measurement of the washing water temperature rise time is terminated, and the time dt required for the temperature of the wash water to rise from T1 to T2 can be known. In other words, when the input value of the heater 7 is constant, if the tableware capacity is small, the heat capacity is reduced accordingly, and the temperature of the washing water rises quickly as shown in FIG.
Thus, the capacity of the tableware is determined based on the time dt.

However, the temperature rise time of the washing water is greatly affected by the value of the surrounding power supply voltage where the dishwasher is installed. For example, in the case of the low voltage (85 V) and the high voltage (115 V) in FIG. The difference Δdt1 or Δdt2 between the temperature rise time dth of the washing water in the standard state and the temperature rise time dth of the washing water due to the heater heating is large. In many cases, it becomes a large error factor when determining the amount of tableware, and it is necessary to correct the temperature rise time dt of the washing water according to the power supply voltage value.

Hereinafter, the correction of the temperature rise time with respect to the power supply voltage value will be described. In step 21 of FIG. 4, the power supply voltage value Va is detected, and in step 22, the correction time value 応 じ corresponding to the difference between the power supply voltage value Va and the standard power supply voltage value (100 V).
dt is calculated, and in step 23, the correction time value に て dt
Is added to or subtracted from the time dt required for the temperature of the washing water to actually rise from T1 to T2 to calculate the corrected temperature rise time dt '. Temperature rise time d after this correction
t ′ can be treated as the same as the temperature rise time dth due to the heating of the washing water in the standard state, and is not affected by the power supply voltage in the environment where the dishwasher is installed. Tableware capacity detection can be performed based on a uniform standard.

(Embodiment 2) Next, a method for stably detecting the power supply voltage value when the actual power supply voltage value fluctuates when the power supply voltage value is detected in step 21 of FIG. 5 will be described. In FIG. 5, reference numeral 21a denotes an actual power supply voltage value waveform;
The power supply voltage values are detected every second as indicated by reference numerals 21c and 21d, and these values are stored in the storage means 13 of FIG. 1. When the power supply voltage value is actually used in step 21, the storage means 13 and retrieves 16 power supply voltage values for the past 16 seconds stored in advance and calculates an average of these values.
By using the calculated average voltage value as the latest power supply voltage value in step 21, it is possible to detect a power supply voltage value that is stable against fluctuations in power supply voltage and noise.

In the present embodiment, the timing for detecting the power supply voltage value, the number of detections, and the timing for calculating the average value of the power supply voltage values are specifically shown. The means for calculating the value is not limited.

(Embodiment 3) Further, when a dishwasher is used in an environment where the power supply voltage is particularly bad, such as frequent instantaneous power failures, a method for stably detecting the power supply voltage value is shown in the flowchart of FIG. It will be described using FIG. In FIG. 6, when the power supply voltage value Vb is detected in step 25, the arithmetic unit 14 shown in FIG. 1 is used to determine in which rank the power supply voltage value Vb belongs to in steps 26 to 32. In the case of, the rank is set to 1 in step 26a, and step 26b
1 is added to the value of the rank counter 1 that counts the number of occurrences of rank 1.

Thereafter, at step 33, the rank having the largest number of rank counters at this time is determined, and the power supply voltage value Vc belonging to this rank is calculated. By using the calculated power supply voltage value Vc as the latest power supply voltage value in step 21, a stable power supply voltage value can be detected even when the dishwasher is used in an environment where the power supply voltage situation is particularly bad. .

In the present embodiment, the number of ranks of the detected power supply voltage values, the timing of ranking, the timing of calculating the power supply voltage value with the highest degree of detection, and the like are specifically shown. In particular, the means for calculating the power supply voltage value having the highest detection degree is not limited.

(Embodiment 4) When the detected power supply voltage value exceeds a predetermined power supply voltage value range (ranging from 85 V to 105 V), a standard state (a state where the power supply voltage value is 100 V) When the correction time value corresponding to the difference from the power supply voltage value in (1) is calculated, the correction time value is too large or too small with respect to the temperature rise time of the cleaning water due to the heater heating, so that the effect of the correction becomes small.

Therefore, the variable values such as the temperature rise time and the correction time value used in determining the amount of tableware and the determined tableware amount are stored in the storage means 13 each time the washing process is completed, and as described above. When the detected power supply voltage value exceeds a predetermined power supply voltage value range, the power supply voltage value used at the time of the previous tableware amount determination is extracted from the storage unit 13 and used to determine the current tableware amount. I do.

In addition, the amount of tableware may be directly determined according to the detected power supply voltage value. For example, if the detected power supply voltage value is less than 85 V, the heater power is too small, and the cleaning time must be the same as the cleaning time when the amount of dishes is at a maximum in order to achieve the expected cleaning effect. In the case where the detected power supply voltage value is less than 85 V, the amount of tableware is unconditionally determined to be the maximum capacity. Conversely, when the detected power supply voltage value is 115 V or more, even if the heater power is sufficiently large and the tableware having the maximum capacity is set, the expected cleaning effect can be obtained only by cleaning for the medium capacity cleaning time. , The tableware capacity is unconditionally determined to be medium capacity.

(Fifth Embodiment) Further, when the power supply voltage value cannot be detected at all due to a circuit failure or some other factor, the power supply voltage value is uniquely determined to be a low voltage, for example, 85 V, and the capacity is determined. Or
By uniquely determining the tableware capacity to the maximum capacity, the expected cleaning effect can be increased.

[0034]

As described above, the present invention detects the value of the power supply voltage in an environment where a dishwasher is actually installed,
A correction time value corresponding to the difference between this value and the power supply voltage value in the standard state is added to or subtracted from the time required for actually heating the cleaning water with the heater and increasing the temperature in a predetermined temperature section. There is a shall be able to criteria very easy to become simultaneously dish volume is Hakare within becomes simplified uniform, obtaining a cleaning effect desired (expected).

Next, the detected power supply voltage value is stored for each predetermined time, and using this, the average value of the power supply voltage values in the past predetermined elapsed time is calculated for each predetermined time, and this is used as the latest power supply voltage value. By adopting as a value, even for fluctuations in the power supply voltage value under various use conditions, it is possible to easily detect an extremely stable power supply voltage value, and thus to accurately determine the amount of tableware , Desired (expected) washing
A shall be able to obtain the purification effect.

Further, the detected power supply voltage values are classified into ranks for each predetermined voltage value, and the degree of occurrence or the number of occurrences according to the rank is stored. By adopting the power supply voltage value of the higher rank as the latest power supply voltage value, it is possible to easily detect a stable power supply voltage value even in an environment where the power supply voltage situation is particularly bad such as frequent instantaneous power failure. , Desired
A shall be able to achieve the cleaning effect of the (expected).

When the detected power supply voltage value is less than or exceeds a predetermined power supply voltage value range, the control means for uniquely determining the amount of tableware is used to prevent the failure of the circuit. Even when the value of the power supply voltage cannot be detected for some reason or other, the capacity of the tableware can be easily determined , and the desired (expected) cleaning effect can be obtained.
It is shall can get.

[Brief description of the drawings]

FIG. 1 is a block diagram of a dishwasher showing one embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the temperature rise of washing water due to heater heating and tableware capacity.

FIG. 3 is a graph showing a relationship between a detected temperature and a power supply voltage value in the tableware capacity.

FIG. 4 is a flowchart showing a process of correcting a power supply voltage value in the present invention.

FIG. 5 is a graph showing a timing of detecting a power supply voltage value.

FIG. 6 is a flowchart showing a process of ranking power supply voltage values according to the present invention.

FIG. 7 is a block diagram of a conventional dishwasher.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cleaning tank 3 Cleaning nozzle 4 Cleaning pump 7 Heater 8 Thermistor (temperature detection means) 15 Power supply voltage detection means 16 Control means

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Wataru Hamaguchi 1006 Kazuma Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (56) References JP-A-63-21029 (JP, A) 20103 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) A47L 15/46

Claims (4)

(57) [Claims] A washing tank for storing dishes, a washing nozzle for jetting washing water toward the dishes, a washing pump for feeding washing water collected in the washing tank to the washing nozzle, and the washing pump. A motor for driving the washing water, a heater for heating the washing water, a temperature detecting means for detecting a temperature of the washing water, a power supply voltage detecting means for detecting a voltage value of a power supply, and washing of tableware,
A series of sequential operations of the rinsing and drying steps are controlled and the cleaning is performed.
A predetermined temperature detected by the temperature detecting means in the process
Tableware quantity according to the length of the rise time of washing water temperature in the section
And control means for determining, the control means corrects the determined of the tableware amount according to the difference between the power supply voltage value and the rated power supply voltage detected by the supply voltage detecting means, the auxiliary
Cleaning process with heater heating according to the amount of tableware after the end
A dishwasher that changes the time . 2. A washing tank for accommodating dishes, a washing nozzle for jetting washing water toward the dishes, a washing pump for sending washing water stored in the washing tank to the washing nozzle, and the washing pump. A motor for driving the washing water, a heater for heating the washing water, a temperature detecting means for detecting a temperature of the washing water, a power supply voltage detecting means for detecting a voltage value of a power supply, and washing of tableware,
Rinsing, controlling the sequential operation of the drying process , the temperature
Temperature rise in a predetermined temperature section detected by the detection means
And a control means for determining the dishes amount by the length of time, storage means for storing a supply voltage detected by the voltage detecting means at every predetermined time, said control means, said storage means
A predetermined number of power supply voltage values for each predetermined time stored in
Out, calculate the average value of the predetermined number of power supply voltage values, and calculate the average value according to the difference between the average power supply voltage value and the rated power supply voltage value.
Correct the determination of the amount of tableware, and according to the corrected amount of tableware,
A dishwasher that changes the time of a washing process involving heating of a heater . 3. A washing tank for accommodating dishes, a washing nozzle for jetting washing water toward the dishes, a washing pump unit for sending washing water stored in the washing tank to the washing nozzle, and the washing pump unit. A motor for driving the washing water, a heater for heating the washing water, a temperature detecting means for detecting a temperature of the washing water, a power supply voltage detecting means for detecting a voltage value of a power supply, and washing of tableware,
Rinsing, controlling the sequential operation of the drying process , the temperature
Temperature rise in a predetermined temperature section detected by the detection means
And control means for determining the dishes amount by the length of time, the power supply voltage value for each predetermined time detected by said voltage detecting means,
Comprising calculating means for performing a ranked into a plurality of predetermined voltage values, a storage means for storing the occurrence rate or the number of occurrences, corresponding to the rank, the control means, stored in said storage means
The power supply voltage value of the rank with the highest detection degree among the power supply voltage values thus determined is defined as a true power supply voltage value, and the determination of the tableware amount is supplemented according to the difference between the true power supply voltage value and the rated power supply voltage value.
Correct the heating of the heater according to the corrected tableware amount.
A dishwasher that changes the time of the cleaning process . 4. A washing tank for accommodating dishes, a washing nozzle for jetting washing water toward the dishes, a washing pump for sending washing water stored in the washing tank to the washing nozzle, and the washing pump. A motor for driving the washing water, a heater for heating the washing water, a temperature detecting means for detecting a temperature of the washing water, a power supply voltage detecting means for detecting a voltage value of a power supply, and washing of tableware,
Rinsing, controlling the sequential operation of the drying process , the temperature
Temperature rise in a predetermined temperature section detected by the detection means
And control means for determining the dishes amount by the length of time,
The control means, when the power supply voltage value detected by the voltage detection means does not reach or exceeds a predetermined power supply voltage value range set in advance, sets the tableware amount to a minimum.
It is determined that the amount is large, and the heater
A dishwasher that changes the time of the washing process .