JPH08191788A - Dishwasher dryer - Google Patents

Abstract

PURPOSE: To provide a dishwasher dryer performing an economic and optimum drying by controlling the drying stroke according to the output change of a temperature sensor. CONSTITUTION: In a dishwasher dryer having temperature detecting means 10, 11, 12 for detecting the internal temperature of a washing tank 2, a control circuit 13 is formed of an actuator control means 14 for controlling a heating device 6, a washing nozzle 8, a circulating pump, a drain pump, a feed water device 4, and an air intake device; a stroke control means for controlling washing and drying strokes; a memory means for storing the detected values from the stroke and temperature detecting means; and a drying end detecting means for judging the drying end time by the time change of detected value of the temperature detecting means to control the drying time, and the drying stroke is controlled according to the detected value from the temperature detecting means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dishwasher / dryer used at home or in industrial use.

[0002]

2. Description of the Related Art In a conventional dishwasher / dryer, a user can select from a plurality of predetermined times regardless of the amount of dishes and the washing time can be set before the equipment is driven.
After deciding the rinsing time and drying time, wash, rinse,
It was to be dried.

[0003]

However, in the above method, since the set time in each process is determined regardless of the amount of dishes, each process is performed according to the washing or drying condition of the dishes. It was difficult to set the time. Especially in the drying process, if the drying process is performed regardless of the dry condition, the drying time will be too long and the temperature of the tableware will rise abnormally, making it difficult to remove the tableware after the drying process, or the user may get burned. In addition, inconvenience may occur such that the tableware is deteriorated and damaged.

On the other hand, if the drying time is too short,
Even after the drying process was completed, there was a problem that water remained in the inside of the glass cup, the depression of the tableware, etc., and the drying was not sufficient.

The present invention is intended to solve such a problem, and it is economical and accurate by knowing the dry state of the tableware in the refrigerator from the output change of the temperature sensor and controlling the drying process time. A first object is to provide a dishwasher that performs optimal drying.

A second object of the present invention is to infer the end of drying of the tableware in the refrigerator from the output change of the temperature sensor and the like, and control the drying process time to economically and optimally perform the dishwashing and drying. Is to provide a machine.

A third object of the present invention is to perform a more economical and optimum dish washing by further analyzing the dry state of the dish in the refrigerator from the change of the output of the temperature sensor and controlling the drying end time. It is to provide a dryer.

[0008]

The first means for achieving the first object of the present invention is a main body, a washing tank for washing dishes, a heating device for heating washing water and dry air, and washing water. Detects the temperature inside the cleaning tank, the circulation pump that circulates the cleaning water, the drainage pump that drains the cleaning water, the water supply device that supplies the cleaning water, the suction device that generates dry air, and the cleaning tank. In the dishwasher and dryer having a temperature detecting means for controlling and a control circuit for controlling these, the control circuit has an actuator control means for controlling the heating device, the cleaning nozzle, the circulation pump, the drainage pump, the water supply device and the intake device,
Process management means for managing the cleaning / drying process, storage means for storing the detected values from the process and temperature detection means, and drying end for controlling the drying time by determining the drying end time based on the time change of the detected value of the temperature detection means The temperature detecting means detects the dry state of the inside of the refrigerator and controls the drying time corresponding thereto.

A second means for attaining the second object of the present invention is that the drying end detecting means compares the time change of the temperature detecting means and detects the bending point of the temperature change, and the position of the bending point and the bending point. (EN) A dishwasher / dryer that determines the end time of drying by inferring the heat capacity in the cleaning tank from the time change amount before and after.

A third means for achieving the third object of the present invention is that the drying completion detecting means compares the time change of the detection value of the temperature detecting means to detect the bending point of the temperature change in the cleaning tank. ,
The position of the bending point and the amount of time change of the detection value of the temperature detecting means before and after the bending point are used to infer the heat capacity in the cleaning tank, and the heat capacity determines the drying end time. Until the drying finish time is detected, and if it detects that the wall is dry, the wall wetting detection means for instructing the drying finish time determination means to infer the drying finish time earlier With.

[0011]

Function The drying time of the dishwasher is determined according to the heat capacity of the object to be dried. This heat capacity is determined not only by the amount of dishes but also by the internal temperature and humidity. During the drying process, heat is applied and steam is forcedly exhausted at the same time to evaporate the moisture in the refrigerator and dry the dishes. At the beginning of the drying process, the temperature inside the chamber rises,
Evaporation of water inside the chamber starts, and the amount of steam inside the chamber rapidly increases. Therefore, both the temperature and the humidity inside the chamber rise, and when the water evaporation amount and the exhaust gas amount become almost the same, the equilibrium state is reached. After that, the storage wall with high thermal conductivity is dried first, and after the storage wall is dried, the temperature further rises and the equilibrium state collapses. At this time, the evaporation amount is less than the exhaust amount, and the humidity gradually decreases. Eventually, the temperature rises gradually, and the tableware dries during this time. Considering such a transition of the drying process, it is considered possible to estimate the heat capacity in the refrigerator by the time until the equilibrium state is reached. In other words, by observing the temperature condition (dry condition) of the storage wall that has the same capacity, we can estimate the heat capacity of the entire storage that should have affected it, and thus estimate the time to finish drying the dishes. Is considered possible.

The first means of the present invention operates as follows. Economical by controlling the drying process by estimating the drying end time of the tableware by measuring the change in the temperature inside the chamber using the temperature detection unit that detects the temperature inside the chamber and estimating the heat capacity inside the chamber. Moreover, it is possible to provide a dishwasher for optimal drying.

The second means of the present invention operates as follows. By comparing the time change of the output of the temperature detection means in the chamber, detecting the bending point of the temperature change, and inferring the heat capacity in the cleaning tank by the position of the bending point and the amount of time change before and after the bending point, The end time of drying is determined and the end of drying is detected. By controlling the drying process in this way, it is possible to provide a dishwasher that performs economical and optimal drying.

The third means of the present invention operates as follows. The drying end detecting means compares the time change of the temperature detecting means and detects the bending point of the temperature change, and infers the heat capacity in the cleaning tank by the position of the bending point and the time change amount before and after the bending point. Heat capacity inference means,
Drying end time determination means for determining the drying end time based on this heat capacity, and detection of drying of the inner wall of the cleaning tank based on the time to the bending point and its size, and if the wall is detected to be dry, the drying end time is advanced. By using the wall wetting detection means for instructing the drying end time determination means so as to deduce to the above, by detecting the drying end, by controlling the drying process, it is possible to realize an economical and optimal dishwashing dryer. Can be provided.

[0015]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, 4, and 5.

As shown in FIG. 1, this embodiment includes a main body 1 and
Washing tank 2 for washing dishes and dish basket 3 for storing dishes
A water supply means 4 for supplying wash water, an intake means 5 for taking in dry air, and a heating means 6 for heating wash water or dry air.
A circulation pump 7 for circulating the cleaning water, a cleaning nozzle 8 for ejecting the cleaning water, a drainage means 9 for draining the cleaning water, and a first unit mounted on the ceiling of the cleaning tank for detecting the temperature inside the cleaning tank. Temperature detecting means 10, second temperature detecting means 11 for detecting the temperature of the bottom of the cleaning tank, third temperature detecting means 12 for detecting the outside air temperature, a microcomputer for controlling each actuator and each detecting means, and an electronic device. The control means 13 is composed of a circuit. Control means 13
Is composed of an actuator control circuit 14 for controlling each of the actuators 4 to 9, a temperature detection circuit 15 for controlling the temperature detection means and processing a signal, and a microcomputer 16 for controlling the 14, 15.

As shown in FIG. 2, the microcomputer 1
Reference numeral 6 denotes a drying end detecting means 17 for detecting the drying end by a signal from the temperature detecting circuit 15, and a step managing means 18 for managing and controlling each step of the dishwasher / dryer.
And a storage means 19 for storing constants and variables required in. Further, the drying end detecting means 17 detects the bending point of the temperature change based on the time series of the temperature change stored in the time series storing means 23 in the storage means 19 and the input from the temperature detecting means. It is composed of a means 20, a heat capacity inferring means 21 for inferring a heat capacity based on the position of this bending point and a change in temperature before and after, and a drying end time determining means 22 determined by the inferred heat capacity. Also, the storage means 19
Is a time series storage means 23 for storing the output from the temperature detection circuit, an inference constant storage means 24 for storing the constant of the inference formula used for the heat capacity inference, and the required time in each step,
It is constituted by a stroke storage means 25 for storing control constants and the like.

Next, the operation of the present embodiment will be described with reference to FIG. First, when a user sets dishes in the dish basket 3 and puts them in the main body 1 and then turns on the power, the dishwasher automatically enters the washing process. Then, after a rinsing step and finally draining, the drying step is started. When entering the drying process as shown in FIG. 4, first, the heating means 6 and the intake means 5 are energized to heat the inside of the refrigerator, and the air in the refrigerator is replaced with the outside air by the intake means 5. When the two means are energized, the process of detecting the end of drying is started.
During the drying completion detection process, the heating device control process interrupts at regular intervals, and the heating device control process controls the temperature of the heating device as shown in FIG. When the end of drying detection is completed, the heating means 6 and the intake means 5 are energized until the end of drying time. During this time, the heating means control routine interrupts at regular intervals to detect the heater temperature and control the temperature inside the refrigerator.

Next, the process of detecting the end of drying will be described with reference to FIG. At the end of the drying process, the temperature detecting means 1
The temperatures inside the cleaning tank, the bottom of the cleaning tank, and the outside air are measured by 0, 11, and 12. The signal processed by the temperature detection circuit 15 is input to the inflection point analysis means 20, is stored in the time series storage means 23, and is analyzed at the inflection point.

The method of bending point analysis will be described below. T (n) -Tp = DELTA_T (n) T (n): Input measured temperature tn-tn-1 Δt Tp: Previously input measured temperature (= T (n-1)) In this formula, T and If the time between Tp is very short, DELTA_T will be equal to the derivative of the time series T. As shown in FIG. 7, in the normal temperature curve (a), DELTA_T is almost constant initially, but at A, it changes and DELTA_T suddenly decreases. Further, as the drying progresses, it reaches B and DELTA_T changes suddenly again. And finally settles down to a small value. At this time, in A and B, the time series T can be said to have a bending point. That is, it can be said that the time series T has three bending points. After detecting the positions of these bending points, the heat capacity is inferred based on this information. That is, the heat capacity is determined by the time between the bending point 1 and the bending point 2 (tAB in FIG. 7), the temperature change from A to B, and the time until reaching the bending point 1 (tA). The larger the heat capacity, the longer tAB and tA, and the smaller the temperature change. The drying end time is determined based on the heat capacity deduced here.

As shown in FIG. 6, the temperature detected by the first temperature detection means is processed by the detection circuit and stored in the time series storage means, and the temperature inputted to the inflection point analysis means. The difference between T2 and the newly input temperature T1, DE
Calculate LTA_T. Further, the difference between DELTA_T calculated last time and DELTA_T calculated this time is calculated, and if the difference is larger than the threshold value, it is determined that the time measured this time hits the bending point of the temperature curve. When the second bending point is determined, the time between the two bending points is calculated, and the heat capacity proportional to this is determined based on the graph of FIG. Further, the time required until the end of drying is determined by the graph of FIG. 10 based on the determined heat capacity and the outside air temperature measured by the third temperature detecting means. In this embodiment, the heat capacity is inferred based on the time and temperature changes, but it is of course possible to infer it by performing pattern recognition of the T curve using a neural network.

(Embodiment 2) An embodiment of the present invention will be described with reference to FIG. The basic configuration of the dishwasher in this embodiment is the same as that in the first embodiment. As shown in FIG. 8, an actuator control circuit 14 that controls each actuator
And a control circuit 13 including a temperature detection circuit 15 and a control means 16. The actuator control circuit 14 and the temperature detection circuit 15 are the same as those in the first embodiment. Drying completion detecting means 2 in the control means 16
6 is composed of a bending point analyzing means 27, a heat capacity inferring means 28, a drying end time determining means 30, and a wall wetting detecting means 29. The bending point analysis means 27, the heat capacity inference means 28, and the drying end time determination means 30 are the same as those in the first embodiment.

Next, the operation of this embodiment will be described. The process other than the judgment of the drying time end in the drying end detection process is the same as that in the first embodiment. Entering the drying process, heating device 6 and intake device 5
After the power is turned on, the dry end detection process starts, and the bending point analysis starts. The bending point analysis is performed in the same manner as in the first embodiment, but at this time, if the second bending point is not detected even after a lapse of a certain time (see (b) of FIG. 7), the wall wetting detection means 29. Informs the drying end time determination means 30 that the wall is not wet. In response to this, the drying end time determination means 30 sets the drying end time shorter than that when the wall is wet, using the graph of FIG. 11 based on tA.
When it is determined that the wall is wet, the drying end time is determined by the same procedure as in the first embodiment. Other stroke operations are performed in the same manner as in the first embodiment.

[0024]

According to the present invention, it is possible to provide a dishwasher for economically and optimally controlling the drying process by controlling the output change of the temperature sensor. By performing the drying end time based on the time-series data of the internal temperature, it is possible to cope with a change in the middle, and it is possible to perform the drying with the optimum drying time. Furthermore, since the drying time is determined by calculating the internal heat capacity, it is possible to determine the drying time in accordance with how to put the dishes, the material, and the like.

[Brief description of drawings]

FIG. 1 is a block diagram of the dishwasher / dryer of the present invention

FIG. 2 is a configuration diagram of a control circuit according to a first embodiment of the present invention.

FIG. 3 is a flowchart of the basic operation of the present invention.

FIG. 4 is a flowchart of the drying process of the present invention.

FIG. 5 is a flowchart of the heating means control process of the present invention.

FIG. 6 is a flowchart of a drying end detection process according to the first embodiment of this invention.

FIG. 7 is a diagram showing the output of the temperature detection circuit of the present invention.

FIG. 8 is a configuration diagram of a control circuit according to a second embodiment of the present invention.

FIG. 9 is a characteristic diagram for determining heat capacity.

FIG. 10 is a characteristic diagram for determining the drying time.

FIG. 11 is a characteristic diagram for determining a drying time when wall wetness is detected.

[Explanation of symbols]

 1 main body 2 washing tank 3 tableware basket 4 water supply device 5 intake device 6 heating device 7 circulation pump 8 washing nozzle 9 drainage pump 10 first temperature detecting means 11 second temperature detecting means 12 third temperature detecting means 13 control circuit

Claims (3)

[Claims] 1. A main body, a washing tank for washing dishes, a heating device for heating washing water and dry air, a washing nozzle for ejecting washing water, a circulation pump for circulating the washing water, and draining the washing water. A drainage pump, a water supply device for supplying cleaning water, an intake device for taking in dry air from outside the machine, a temperature detecting means for detecting the temperature in the cleaning tank, and a control circuit for controlling these. The control circuit is a heating device, a cleaning nozzle,
An actuator control means for controlling the circulation pump, the drainage pump, the water supply device and the intake device, a stroke management means for managing the washing / drying process, a storage means for storing the detected values from the stroke and temperature detection means, and a temperature detection means. A dishwasher / dryer, which comprises a drying end detection unit that determines the drying end time based on the change in the detected value and controls the drying time, and controls the drying process based on the detection value from the temperature detection unit. 2. Drying completion detecting means detects a bending point of the temperature change in the cleaning tank by comparing the time change of the detected value of the temperature detecting means, and detects the position of the bending point and the temperature detecting means before and after the bending point. 2. The dishwasher / dryer according to claim 1, wherein the heat capacity in the cleaning tank is inferred from the time change amount of the detected value, and the drying end time for determining the drying end time is determined by the heat capacity. 3. Drying completion detecting means detects the bending point of the temperature change in the cleaning tank by comparing the time change of the detection value of the temperature detecting means, and detects the position of the bending point and the temperature detecting means before and after the bending point. The heat capacity in the cleaning tank is inferred from the amount of change in the detected value over time, and the determination means for determining the drying end time is determined by this heat capacity, and the time to the bending point and the size of the cleaning tank inner wall The dishwasher / dryer according to claim 1, further comprising: a wall wetting detection unit for instructing the drying end time determination unit to infer the drying end time earlier if the drying is detected and the wall is detected to be dry.