JPH0810209A - Dish washing dryer - Google Patents

Abstract

PURPOSE:To detect the permeability of washing water correctly by setting prescribed standby time after stopping a water sending operation and reading in the permeability of the washing water after food residuum is sedimented or a bubble is dissipated. CONSTITUTION:A control part 41 finds additional washing time, rinsing time and drying time, etc., by fuzzy inference based on a detection value detected by a permeability detecting means 33, and executes every process based on the data of them. A washing and discharge pump 7 and a heater 4 are turned off in a fuzzy process, and for example, the permeability is detected by the detecting means 33 after the lapse of one minute, and the detection value is stored in a buffer MD 37. The storage value of the buffer HD 37 is compared with that of a buffer MC 36, and a smaller value is stored in a buffet MF 39. In this way, since the food residuum floating in the washing water is sedimented or the bublle occurring due to cavitation phenomenon is dissipated while the water sending operation is being performed, the permeability of washing water itself can be detected correctly.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a dishwasher.

[0002]

2. Description of the Related Art A dishwasher / dryer of this type is disclosed in JP-A-60
-48724. In this product, at least a part of the side wall of the water absorption path between the water reservoir provided at the bottom of the cavity and the water absorption side of the nozzle pump is made of a translucent material, through which the liquid inside the water absorption tube permeates. A light emitting element and a light receiving element for detecting a change in the rate are arranged, and when the change in the amount of light received by the light receiving element disappears, the cleaning, rinsing, draining and drying processes are finished.

At the time of cleaning, the nozzle pump is intermittently operated at predetermined time intervals including a short dwell time, and the permeability of the wash water is detected at each dwell time.

[0004]

By the way, during cleaning, food residue is floating in the cleaning water passing through the water absorption path. Usually, a filter is placed in the water absorption route to collect such food waste,
Complete recovery is not possible. Then, the floating food debris eventually sinks when the pump is stopped.

In the vicinity of the suction port of the pump, fine bubbles may be generated due to the cavitation phenomenon.
Then, such bubbles disappear in due time when the pump is stopped.

However, in the above-mentioned conventional example, when it is attempted to detect the permeability immediately after the pump is stopped, food residues are still floating or bubbles have not disappeared. As a result, food dust or bubbles may interfere with the light traveling from the light emitting element to the light receiving element, and the transmittance of the cleaning water itself may not be accurately detected.

[0007] In general, it is desirable to raise the temperature of washing water to soften the oil and wash the oil stain, but conversely,
Protein stains such as eggs will need to be washed at a low temperature because the wash water will coagulate if the temperature of the wash water becomes high (60 ° C or higher).

However, in the above-mentioned conventional example, although the cleaning state of the dirt adhering to the tableware can be detected, the sequence corresponding to the quality of such dirt is not carried out, so that an oil film is formed on the tableware after cleaning. Sometimes they remained, or eggs remained stuck to them.

The present invention relates to a dishwasher and solves such a problem.

[0010]

Means for Solving the Problems The means of the present invention for solving the above-mentioned problems include a cavity for storing dishes, a water supply means for supplying washing water into the cavity, and a cavity arranged in the cavity. A water sending means for sending washing water to the nozzles and spraying it on the dishes, a heating means for heating the washing water in the cavity, a light emitting element and a light receiving element facing each other, and a transmittance detecting means for detecting the transmittance of the washing water. A stop means for stopping the operation of the water supply means at any time during the cleaning step, a measuring means for measuring a predetermined time from the stop of the water supply means by the stop means, and a permeation of the wash water after the predetermined time has elapsed. Reading means for reading the degree of transparency from the transparency detecting means, and control means for controlling a sequence of subsequent cleaning, rinsing, etc. based on the transparency read by the reading means. It is.

Further, in the above structure, before the water supply means first operates in the cleaning step, an initial reading means for reading the permeability of the cleaning water as an initial permeability is provided, and the stopping means further comprises the water supply means. Performs a first stop of the water supply means after a first predetermined time from the first operation in the cleaning step and a second stop after a second predetermined time longer than the first predetermined time, and the reading means is No. 1 read the permeability of the wash water as the first permeability and read the permeability of the second wash water as the second permeability, and the control means sets the initial permeability, the first This is a configuration for controlling the sequence of subsequent cleaning, rinsing, etc. based on the transmittance and the second transmittance.

Further, in the above-mentioned structure, a comparison means for comparing the initial transmittance and the first transmittance is provided, and the control means can obtain a result that the first transmittance is large by the comparison means. For example, the sequence is controlled without using the initial transparency.

[0013]

When reading the permeability of the wash water from the permeability detecting means, first, the water feeding operation of the water feeding means is stopped. Then, it waits for a predetermined time, for example, 1 minute, and waits for the food residue floating in the wash water during the water supply operation to sink or for the bubbles generated by the cavitation phenomenon to disappear. Then, the permeability of the wash water is read from the permeability detecting means.

Further, the permeability of the cleaning water is read as the initial permeability before the water supply means operates to start the cleaning, and further, the permeability of the water supply operation after the lapse of the first predetermined time from the start of the cleaning. At the time of stop, and at the time of stop of the water supply operation after a second predetermined time after that, they are read as the first permeability and the second permeability, respectively.

When the amount of stains on the tableware is large, the first and second permeabilities, which are the permeabilities at the time of cleaning, become smaller, and when the amount of stains is small, the permeabilities at the time of cleaning are smaller. Not much different from before washing. Therefore, how much the amount of dirt is can be determined by the difference between the initial transmittance which is the transmittance before cleaning and the first transmittance or the second transmittance which is the transmittance during cleaning.

When the stains on the dishes are oily stains, the washing water is heated by the heating means during washing, but immediately after the washing is started, the temperature of the washing water is still low, so immediately. Dirt is hard to remove. Then, with the lapse of time, the temperature of the wash water rises, and the dirt comes to fall off the dishes.
Therefore, in the case of oil stain, the difference between the first transmittance and the second transmittance becomes large. On the other hand, in the case of stains such as proteins other than oil stains, most of them fall off immediately after the start of washing, so the difference between the first permeability and the second permeability becomes small. In this way, the quality of dirt can be judged by the difference between the first transmittance and the second transmittance.

The control means uses a sequence of cleaning, rinsing, etc., based on the amount of stains and the quality of stains, for example, fuzzy reasoning, to lengthen the washing time if the dishes are well soiled. If the oil stains are severe, the temperature of the washing water is raised, and if the dishes are lightly soiled, the washing time is shortened.

Further, when the result which is not considered normally is that the initial transmittance before cleaning is smaller than the first transmittance during cleaning, the control means does not use the initial transmittance and The sequence is controlled only by the first transparency and the second transparency.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes an opening in the front surface, a cavity for accommodating tableware from the opening, 2 a door for closing the opening of the cavity 1, and 3 a rotatably mounted substantially at the center of the bottom surface of the cavity 1. Nozzle, 4 is cavity 1
And a heater for heating the cleaning water in the cavity 1. Reference numeral 5 denotes a concave portion formed in front of the bottom of the cavity 1 and has a discharge port 6 for discharging the cleaning water from the bottom of the concave portion 5 to the side. Reference numeral 7 denotes a cleaning / draining pump mounted on the outer bottom surface of the cavity 1, and includes a pump casing 11 having a suction port 8, a discharge port 9, and an impeller 10. When the washing / draining pump 7 rotates forward, water is supplied to the nozzle 3 from the discharge port 9 of the pump casing 11 to inject washing water into the dishes in the cavity 1. Drain the washing water outside the machine. Further, a step is provided by setting the position of the suction port 8 of the pump casing 11 to be higher than the discharge port 6 of the recess 5 by about 15 mm. The cleaning / drainage pump 7 also serves as a cleaning pump and a drainage pump, but the present invention is not limited to the embodiment, and a cleaning pump and a drainage pump may be provided respectively.

Reference numeral 12 is a pipe made of rubber, which connects the suction port 8 and the discharge port 6, and 13 is a filter which is provided in the recess 5 and removes the residual food in the washing water. Reference numeral 14 denotes an outer tank that covers the cavity 1, and 15 denotes a rear plate that is attached to the outer tank 14 at a predetermined interval from the rear surface of the cavity 1. Between the rear plate 15 and the cavity 1, a circulation air passage 17 and a cooling air passage 18 partitioned by a double-sided fan 16 are provided. The circulation air passage 17 communicates with an exhaust port 19 provided on the upper rear surface of the cavity 1 and an intake port 20 on the lower rear surface thereof, and the air in the cavity 1 is forcibly forced from the exhaust port 19 by the double-sided fan 16. The air is exhausted into the circulating air passage 17, and the air dehumidified by heat exchange by the double-sided fan is sucked into the cavity 1 again through the air inlet 20.

Reference numeral 22 is a water supply valve provided on the rear surface side of the cavity 1, 23 is a water supply port provided in the circulation air passage 17 and connected to the water supply valve 22, 24 is a motor for rotationally driving the double-sided fan 16, and 25 is It is a control unit that controls the operation of the dishwasher.

In FIGS. 2 and 3, reference numeral 26 denotes a connecting portion with the pipe 12 on the suction port 8 side of the pump casing 11, and 27
Is provided on the left side of the connecting portion 26 toward the suction port 8, and a light emitting portion formed of a transparent member, 28 is provided on the right side of the connecting portion 26 facing the light emitting portion 27, A light receiving / transmitting part formed of a transparent member, 29 is a light emitting element such as a diode, 30 is a light receiving element such as a phototransistor, and 31 is a pump casing 11 for fixing the light emitting element 29 to the light emitting / transmitting part 27 of the connecting part 26. A light emitting element mounting portion 32 is screwed to the pump casing 11 to fix the light receiving element 30 to the light transmitting portion 28. The above-mentioned light emitting / transmitting part 2
7, light-transmitting portion 28, light-emitting element 29, light-receiving element 30, light-emitting attachment portion 31, light-receiving attachment portion 32,
Is configured.

In FIG. 4, reference numeral 34 is a transparency detecting means 33.
Are the same buffer MB, 36 is the same buffer MC, 37 is the same buffer MD, 38 is the buffer ME for temporarily suspending the operation result, 39 is the same buffer MF, and 40 is the cleaning time. ,
A counter 41 for counting the rinsing time and the drying time, and 41 obtains an additional cleaning time, a rinsing time and a drying time by fuzzy inference based on the detection value detected by the transmittance detecting means 33, and performs each process based on the data. This is the control unit to be executed.

The control unit 41 also serves as a comparison unit for comparing the transmittance at the beginning of the cleaning process (corresponding to the initial transmittance) and the transmittance at the elapse of a predetermined time (corresponding to the first transmittance).

The operation of the above structure will be described with reference to FIGS. When the operation is started, first, the transmittance is detected by the transmittance detecting means 33 (S-1), and the detected value is stored in the buffer MA34 (S-2). (S-3). If a predetermined amount of water is supplied, the temperature of the supplied cleaning water is detected (S-
4) and if it is 52 degrees or more, the arrival flag is set (S-
5) Do. Thereafter, the transmittance is detected by the transmittance detecting means 33 (S-6), and the detected value is stored in the buffer MB35 (S-7). After storing the detected value in the buffer MB35, the stored value of the buffer MA34 is compared with the stored value of the buffer MB35, and the larger value is stored in the buffer ME38 (S-8). Then, the cleaning and drainage pump 7 is rotated forward and the heater 4 is turned on (S-9) to start the cleaning process.

In the cleaning step, the cleaning / drainage pump 7 is stopped (S-10) two minutes after the cleaning is started, and one minute after that, the transmittance is detected by the transmittance detecting means 33 and the detected value is detected. Is stored in the buffer MC36, and the cleaning / drainage pump 7 is normally rotated again (S-11). When 8 minutes have passed from the start of cleaning, the arrival flag is detected, and if it is set, that is, if the supplied cleaning water is 52 degrees or more, the process proceeds to the fuzzy inference step (S-14). During the washing process, it is detected whether or not the temperature of the washing water has reached 52 degrees, and if it has reached 52 degrees, the temperature flag is set (S-12).
To do. At this time, the heater 4 is not turned off, and if the heating is further continued and reaches 58 degrees, the heater 4 is turned off (S-13).

When 9 minutes have passed since the cleaning was started, the temperature flag is first detected. If the temperature flag is set, the flow shifts to the fuzzy process (S-15). If the temperature flag is not set, the washing process is continued until the washing water reaches 52 degrees, and when the temperature reaches 52 degrees, the process shifts to the fuzzy process.

In the fuzzy process, the cleaning / drainage pump 7 and the heater 4 are turned off (S-16), 1 minute later, the transmittance is detected by the transmittance detecting means 33 (S-17), and the detected value is buffered. The data is stored in the MD 37 (S-18). Buffer MD3
7, the value stored in the buffer MC36 is compared with the value stored in the buffer MD37, and the smaller value is stored in the buffer M3.
It is stored in F39 (S-19).

Thereafter, if the buffer MD37 is stored in the buffer MF39 in step (S-19), the buffer M37 is stored.
E38 and the buffer MC36 are compared, and the step (S
If the buffer MD37 is stored in the buffer MF39 in step -19), the buffer ME38 and the buffer MD37 are compared (S-49), and if it is determined that the buffer ME38 is small, the content of the buffer MF39 is set as the amount of dirt. (S-50), buffer MD37 to buffer MC36
Is used as the quality of dirt (S-51), and fuzzy inference (S-23) is performed based on these values.

That is, if the transmittance before the start of cleaning is smaller than the transmittance after the start of cleaning, the transmittance before the start of cleaning is ignored, and the detected value (transmittance) at the detection 3 or the detection 4 as the amount of dirt. Of the contamination and the difference between the detection values of the detection 3 and the detection 4, and the fuzzy inference is performed based on the data of the contamination amount and the contamination quality.

In step (S-49), the buffer M
If E38 is determined to be large, then the buffer ME38
And the buffer MF39 are compared (S-20). As a result, if the stored value of the buffer ME38 is large, (reference voltage)
× (MF / ME) is calculated and the calculation result is used as the amount of dirt.
If the stored value of the buffer MF39 is large, the amount of dirt in the buffer MF39 is set (S-21).

After calculating the amount of dirt, ((buffer MD-
(Buffer MC) / ME) × (reference voltage) (S-2
2) Then, the calculation result is used as the quality of the stain.

FIG. 13 is a diagram showing the relationship between the amount of dirt and the transmittance.
Shows the relationship between stain quality and permeability. It should be noted that before the water supply operation, the time point when the transmittance is detected is detected 1 (data stored in the buffer MA), the time point of the permeability detection after water supply is detected 2 (the data stored in the buffer MB), and the cleaning is started. Detects the point at which the transmittance is detected after 3 minutes
(Data stored in the buffer MC), and the point in time when the transmittance is detected during the fuzzy process is defined as detection 4 (data stored in the buffer MD).

In FIG. 13, when the dishes are heavily soiled, the wash water is often turbid, and therefore the transmittance detected by the detection 3 or the detection 4 is small (characteristic A). In the case of light dirt, the transmittance is slightly lower than the transmittance before washing, but the transmittance is relatively large because the washing water is not so dirty (characteristic b). That is,
If the transmittance of the detection 3 or the detection 4 is small, the stain is severe, and if it is large, the stain is light.

In FIG. 14, in the case of oil stains, it is necessary to first soften the oil with warm water, and it takes time to remove it from the dishes. Accordingly, since the oil content has not dropped from the tableware, the transmittance of the detection 3 is large, but the transmittance of the detection 4 is smaller due to the oil content and exhibits the characteristic (a). Further, in the case of protein stains other than oil stains, most of the stains are removed at the time of the detection 3, so that there is almost no difference between the transmittance of the detection 3 and the transmittance of the detection 4, and the characteristic (b) is exhibited. That is, if the difference between the detection 3 and the detection 4 is large, the amount of oil stain is large, and if the difference is small, the stain such as protein other than oil stain is indicated.

The amount of dirt obtained in (S-21) and (S-
Fuzzy inference is performed by the controller 41 based on the rule of FIG. 15 and the membership functions of FIG. 16 and FIG. 17 using the quality of the soil obtained in 22) as input data (S-23), and the additional cleaning temperature DA and the additional Cleaning time DB, rinse cleaning time D
C, hot water rinsing temperature DD, rinsing frequency DE, drying time D
Determine F. For example, when the amount of dirt is small and the quality of dirt is large, that is, when it is determined that the oil stain is a little
The additional washing temperature is set slightly higher, the additional washing time is set slightly longer, the rinsing time is set shorter, the hot water rinsing temperature is set at an intermediate temperature, and the drying time is set shorter. When the control unit 41 performs the fuzzy inference, the process proceeds to the next additional cleaning process.

In the additional cleaning step, first, the cleaning / drainage pump 7 is used.
And the heater 4 is turned on (S-24). Thereafter, the control unit 41 detects the temperature of the cleaning water until the temperature reaches the additional cleaning temperature DA (S-25). When the cleaning water reaches the additional cleaning temperature DA, the additional cleaning time DB is set in the counter 40 (S-26), and the additional cleaning is continued (S-27) until it is counted up. When the counter 40 counts up, the washing / draining pump 7 is stopped and the heater 4 is turned off (S-28). Then, the pump 7 is reversed to start draining (S-29). When drainage is completed, the process moves to the next rinse process.

In the rinsing step, first, the rinsing and cleaning time DC is set in the counter 40 (S-30), and water supply is started (S).
-31). When a predetermined amount of rinsing water is supplied, the washing / draining pump 7 is rotated forward (S-32) to start rinsing. The time set in the counter 40 is counted (S
-33), the pump 7 is reversed to drain the rinse water in the cavity 1 (S-34). And counter 4
The rinsing time 1 minute is set to 0 (S-35). with this,
This means that one rinsing operation has been completed. If the above-described rinsing operation is executed for the number of times of rinsing DD calculated by fuzzy inference (S-36), the process moves to the next hot water rinsing process.

In the hot water rinsing step, first, a predetermined amount of rinsing water is supplied into the cavity 1 (S-37). afterwards,
The cleaning / drainage pump 7 is rotated in the normal direction, and the heater 4 is turned on (S-38) to heat the rinse water. If the rinsing water reaches the hot water rinsing temperature DE (S-39), the counter 40 is set to the hot water rinsing time of 3 minutes (S-40), and the set time is counted up (S-4).
1) The heater 4 is turned off (S-42), and the rinsing water in the cavity 1 is drained by reversing the washing / draining pump 7 (S-43).

In the drying process, first, the drying time DF is set in the counter 40 (S-44), and the heater 4 and the motor 24 are turned on (S-45). Until the counter 40 counts up, the heater 4 is turned on and off (S-46) so that the temperature in the cavity 1 is maintained at 65 degrees, and the double-sided fan 16 is rotated by the motor 24 to rotate the inside of the cavity 1 Is circulated to the circulation air passage 17. By doing so, the air in the cavity 1 is dehumidified, and the dried air is applied to the tableware to be dried. When the counter 40 counts up (S-47), the heater 4 and the motor 24 are turned off (S-48), and the drying process is completed.

[0041]

According to the construction of the dishwasher / dryer of the present invention, after stopping the water supply operation of the water supply means, the apparatus waits for a predetermined time, and food residue floating in the wash water during the water supply operation sinks or cavitation occurs. Waiting for the bubbles generated by the phenomenon to disappear, the permeability of the cleaning water is read, so that the light traveling from the light emitting element to the light receiving element is not obstructed by the debris or bubbles of the food. It can correctly detect its own transparency.

Furthermore, since the amount and quality of dirt adhering to the dishes is judged based on the difference in the transparency and the sequence of cleaning, rinsing, etc. is determined, the cleaning can be more tailored to the dirt and the cleaning power is improved.

Further, it is judged whether or not the initial transmittance read before cleaning is reliable. If the initial transmittance is not reliable, the quantity and quality of dirt are judged without using this transmittance.
It is possible to prevent the detection accuracy of the amount and quality of dirt from decreasing.

[Brief description of drawings]

FIG. 1 is a side sectional view of the dishwasher of the present invention.

FIG. 2 is an enlarged view of the bottom of the cavity.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a control block diagram.

FIG. 5 is an operation flowchart of a cleaning process.

FIG. 6 is a continuation of the flowchart in FIG. 5;

FIG. 7 is a continuation of the flowchart of FIG.

FIG. 8 is an operation flowchart of a fuzzy process.

FIG. 9 is a flowchart of an additional cleaning step.

FIG. 10 is an operation flowchart of a rinsing step.

FIG. 11 is an operation flowchart of a hot water rinsing step.

FIG. 12 is an operation flowchart of a drying process.

FIG. 13 is a diagram showing the relationship between the amount of dirt and the permeability of cleaning water.

FIG. 14 is a diagram showing the relationship between the quality of dirt and the permeability of cleaning water.

FIG. 15 is a diagram showing a rule table for fuzzy inference.

FIG. 16 is a diagram showing a membership function relating to the amount of dirt.

FIG. 17 is a diagram showing a membership function relating to stain quality.

[Explanation of symbols]

1 Cavity 3 Nozzle 4 Heater (Heating Means) 7 Cleaning / Drainage Pump (Water Supply Means) 33 Permeability Detection Means 41 Control Unit (Stop Means, Measuring Means, Reading Means, Control Means, Initial Reading Means, Comparison Means)

Claims (3)

[Claims] 1. A cavity for accommodating tableware, a water supply means for supplying cleaning water into the cavity, a water supply means for supplying cleaning water to a nozzle arranged in the cavity and spraying the same onto the tableware, and inside the cavity. Heating means for heating the washing water, a light emitting element and a light receiving element facing each other, and a permeability detecting means for detecting the permeability of the washing water, and the operation of the water feeding means is stopped at an arbitrary point during the washing process. Stopping means, measuring means for measuring a predetermined time from the stop of the water supply means by the stopping means, reading means for reading the permeability of washing water after the predetermined time from the permeability detecting means, and reading by the reading means A dishwasher / dryer, comprising: a control unit that controls a sequence of subsequent cleaning, rinsing, and the like based on the permeation rate. 2. An initial reading means for reading the permeability of cleaning water as an initial permeability before the water supply means first operates in the cleaning step, and the stopping means further comprises: The first stop of the water supply means is performed after a first predetermined time from the first operation, and the second stop is performed after a second predetermined time longer than the first predetermined time. First the permeability of the wash water
At the same time as reading the permeability, the permeability of the cleaning water at the second stop is read as the second permeability, and the control means performs the subsequent cleaning based on the initial permeability, the first permeability and the second permeability. The dishwasher / dryer according to claim 1, which controls a sequence of rinsing, rinsing, and the like. 3. The comparison means for comparing the initial transmission rate and the first transmission rate is provided, and the control means sets the initial transmission rate if the comparison means obtains a result that the first transmission rate is large. The dishwasher of claim 2, wherein the sequence is controlled without using transparency.