JPH0819504A - Dish washing machine - Google Patents

Abstract

PURPOSE:To provide a dish washing machine to wash dishes, etc., accommodated in a washing chamber by flushing them with a washing water, with which the dishes, etc., in the chamber are cooled without being left at a high temp. in case a thermostat for prevention of over-rise of the temp. is actuated. CONSTITUTION:A washing water or air in a washing chamber 1 in which dishes, etc., 2 are accommodated is heated by a heater 7, and the temp. in the chamber 1 is sensed by a thermistor 8, and the steam in the chamber 1 is sent to the outside by a blower fan 9. When attainment of the specified temp. in the chamber 1 is sensed, a thermostat 14 shuts off current feed to the heater 7. A control means 16 controls the program sequence including the washing, rinsing, and drying processes and actuates the blower fan 9 in case the thermostat 14 is actuated until the first predetermined specified period of time will have elapsed or the thermistor 8 senses the first specific temp.

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 by spraying washing water on the dishes stored in a washing tank.

[0002]

2. Description of the Related Art In recent years, there has been proposed a dishwasher equipped with a thermostat (excessive temperature rise preventing means) that shuts off energization of a load when the temperature in a washing tank reaches a predetermined temperature.

Conventionally, this kind of dishwasher has been constructed as shown in FIG. The configuration will be described below.

As shown in the figure, a cleaning tank 1 stores dishes 2 inside and stores cleaning water at the bottom. Cleaning nozzle 3
Is rotatably supported in the washing tank 1 and spouts washing water toward the tableware 2. The washing pump 4 sends the washing water to the washing nozzle 3, and the washing pump 4 uses a motor 5
Driven by. The water level sensor 6 detects the water level in the cleaning tank 1 and outputs it as an electric signal. The heater 7 is arranged at the bottom of the cleaning tank 1 to heat the cleaning water. The thermistor (temperature detection means) 8 is attached to the bottom of the cleaning tank 1 so as to be in close contact with the outside, and detects the temperature of the cleaning water.

The blower fan 9 (exhaust means) sends out the vapor in the cleaning tank 1 and is discharged from the exhaust port 10 to the outside of the machine. The tableware basket 11 is for arranging the tableware 2 and is arranged in the cleaning tank 1. The water supply unit 12 supplies tap water into the cleaning tank 1, and the drainage unit 13 discharges the cleaning water in the cleaning tank 1 to the outside of the tank. The thermostat (over-temperature rise preventing means) 14 has a predetermined temperature (for example, 100 ° C.) in the cleaning tank 1.
(° C) is detected, the power supply to the load such as the motor 5 and the heater 7 is cut off. The control means 15 controls the sequential operation of a series of program sequences of cleaning, rinsing and drying processes.

To explain the operation of the above configuration, when the user places the tableware 2 in the tableware basket 11 and stores it in the cleaning tank 1 and puts detergent into it and starts the operation, first, the cleaning tank 1
A predetermined amount of tap water is supplied by the water supply means 12 until the water level sensor 6 detects a predetermined water level at the bottom of the. And
The motor 5 and the heater 7 are energized and the washing water is heated and jetted from the washing nozzle 3 toward the dishes 2 by the washing pump 4. At this time, the temperature of the wash water is detected by the thermistor 8, and the control means 15 always grasps the temperature of the wash water.

The temperature of the wash water reaches a predetermined temperature, and
When a predetermined time has elapsed from the start of cleaning, the control means 15 ends the cleaning process and the drain means 13 drains the cleaning water out of the tank. Next, tap water is newly supplied, and the same operation as the above-mentioned washing process is performed for several minutes to drain the water. After this rinsing step is repeated several times, the same operation as a washing step called a heat rinsing step is performed, and when the predetermined temperature is reached, the operation is finished and drained. Finally, the blower fan 9 is operated to wash the cleaning tank 1.
At the same time that the steam inside is discharged to the outside of the machine, the heater 7 is intermittently energized to heat the tableware 2 and dry the attached water droplets.

In the above-mentioned successive series of operations, due to factors such as failure of the heater drive circuit and the thermistor 8 during heating by the heater 7, the temperature in the cleaning tank 1 cannot be adjusted properly and the temperature in the cleaning tank 1 is not adjusted. If it becomes extremely hot,
Explaining with reference to the flowchart of FIG. 7, when the thermostat 14 detects an abnormal temperature (100 ° C.) in the cleaning tank 1 in step 20 of FIG. 7, the thermostat 14 forcibly shuts off the energization of the heater 7 in a circuit. However, in step 21, the control means 15 learns that the thermostat 14 has operated, and temporarily interrupts the energization of the heater 7, and in step 22, notifies the abnormality.

[0009]

In such a conventional dishwasher, when the temperature of the washing tank 1 in the thermostat 14 becomes abnormally high due to a failure of the heater drive circuit or the thermistor 8, the heater 7 Power is cut off to notify the user of the abnormality and call attention to the user. On the other hand, the dish 2 made of plastic is discolored or deformed due to the high temperature, because the washing tank 1 is left at a high temperature. Had.

The present invention solves the above problems. When the heater driving circuit or thermistor fails, the temperature inside the cleaning tank becomes abnormally high and the thermostat operates, so that the dishes in the cleaning tank are heated to a high temperature. The first purpose is to cool without leaving it as it is.

A second object of the present invention is to cool the dishes in the washing tank without leaving them at a high temperature when the thermostat operates even under a high ambient temperature surrounding the dishwasher.

Further, in the process of cooling the dishes in the washing tank with the operation of the thermostat, when the user notices an abnormality and takes out the dishes from the washing tank, the cooling of the dishes should be promptly stopped. It has a third purpose.

[0013]

In order to achieve the first object, the present invention provides a cleaning tank for storing dishes, a heater for heating cleaning water or air in the cleaning tank, and the cleaning tank. Thermistor that detects the temperature inside (temperature detection means)
A blower fan (exhaust means) for sending the steam in the cleaning tank to the outside of the tank; and a thermostat (excess temperature rise preventing means) for cutting off the electric power supply to the heater (load) when a predetermined temperature in the cleaning tank is detected. , A control means for controlling a series of program sequences of washing, rinsing, and drying steps of the tableware, the control means, when the thermostat operates, until the first predetermined time elapses, or the thermistor. The first problem solving means is that the blower fan is operated until the first predetermined temperature is detected.

In order to achieve the second object, in addition to the means for solving the first problem, a water supply means for supplying tap water into the cleaning tank, and the cleaning water in the cleaning tank for tableware. A cleaning nozzle that ejects toward the cleaning tank, a cleaning pump that feeds the cleaning water accumulated in the cleaning tank to the cleaning nozzle, and a motor that drives the cleaning pump are provided. When the thermistor cannot detect the second predetermined temperature even after a lapse of time, water is supplied to the predetermined water level by the water supply means and the third predetermined time elapses, or the thermistor detects the third predetermined temperature. Up to now, the operation of the cleaning pump is the second means for solving the problems.

Further, in order to achieve the third object, in addition to the means for solving the above-mentioned first problem, there is provided an opening and closing door provided for putting in and taking out dishes in and from the washing tank, and the control means is a thermostat. When the blower fan is operated in accordance with the operation of, and the door is opened and closed for the fourth predetermined time,
The third problem solving means is that the blower fan is uniquely stopped.

[0016]

According to the first means for solving the above problems, the present invention provides:
If the temperature inside the cleaning tank becomes abnormally high due to a failure of the heater drive circuit or the thermistor and the thermostat (overheating prevention means) operates, the first predetermined time elapses or the thermistor (temperature Detection means) is the first
Since the blower fan (exhaust means) is operated until the predetermined temperature is detected, it is possible to prevent the tableware from being left at a high temperature.

Further, according to the second means for solving the problem, when the thermostat operates under the condition that the ambient temperature surrounding the dishwasher is high, the expected cooling effect cannot be sufficiently obtained even if the blower fan is operated. In the same manner, the water is supplied to the predetermined water level by the water supply means, and the washing pump is operated until the third predetermined time elapses or the thermistor detects the third predetermined temperature, so that the tableware is left at a high temperature. The tableware can be cooled effectively without any.

According to the third means for solving the problems, in the process of cooling the dishes in the washing tank by operating the blower fan in accordance with the thermostat operation, the user notices the abnormality notification and removes the dishes from the washing tank. When it is taken out, the control means knows that the door has been opened and closed and uniquely stops the blower fan, so that the cooling of the tableware can be stopped quickly.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIG. The same components as those of the above-mentioned conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the control means 16 controls a series of program sequences for the washing, rinsing and drying steps of the tableware 2, and when the thermostat (over temperature rise preventing means) 14 operates, the thermistor ( The blower fan (exhaust means) 9 is operated until the temperature detection means detects the first predetermined temperature (for example, 40 ° C.).

The operation of the above configuration will be described with reference to FIG. The series of sequential operations of the cleaning, rinsing, and drying process of the tableware 2 by the control means 16 are the same as in the conventional example, and therefore the description thereof is omitted and the thermostat 14 is omitted.
The process of detecting an abnormal temperature in the cleaning tank 1 and cooling the tableware 2 in the cleaning tank 1 by means of will be described.

The user stores the tableware 2 in the washing tank 1,
When the program sequence is started and the temperature inside the cleaning tank 1 detects an abnormal temperature (100 ° C.) in step 20 of FIG. 2, the control means 16 cuts off the power supply to the heater 7 in step 21, and step 22 At step 23, the user is alerted and the blower fan 9 is operated to discharge the high temperature steam in the cleaning tank 1 to the outside of the tank. At step 24, the thermistor 8 is used to clean the inside of the cleaning tank 1. Temperature is first
The blower fan 9 is operated until the predetermined temperature (40 ° C.) is detected.

As a result, it is possible to prevent the tableware 2 from being left at a high temperature when the thermostat 14 operates.

In the above embodiment, the thermostat 1
The specific temperature and timing of the thermistor 8 for determining the operation temperature of No. 4 and the end of the operation of the blower fan 9 are shown. This is particularly for the method of detecting an abnormal temperature in the cleaning tank 1 by the thermostat 14 and the tableware in the cleaning tank 1. The means of the cooling treatment of 2 is not limited.

In the above embodiment, the thermostat 1
4 operates, the blower fan 9 is operated until the thermistor 8 detects the first predetermined temperature, but for the first predetermined time (until the temperature in the cleaning tank 1 reaches about 40 ° C.). The blower fan 9 may be operated until the time () has elapsed.

Next, a second embodiment of the present invention will be described. In the control means 16 in FIG. 1, even if the thermostat 14 operates and a second predetermined time (for example, 20 minutes) elapses, the thermistor 8 has a second predetermined temperature (for example, 4).
If 0 ° C.) cannot be detected, the water supply means 12 supplies water to a predetermined water level, and the cleaning pump 4 is operated until the third predetermined time (for example, 1 minute) has elapsed. The other structure is the same as that of the first embodiment.

The operation of the above configuration will be described with reference to FIG. It should be noted that steps 20 to 22 in FIG. 3 are the same as those in the first embodiment, and therefore description thereof will be omitted.

Step 20, Step 21, Step 2
In step 2, the thermostat 14 operates to cut off the energization to the heater 7 to notify the abnormality and call the user's attention. Then, in step 25, the control means 16 starts the timer measurement, and in step 23. The operation of the blower fan 9 is started, the timer measurement time t is known in step 26, and step 27
If the timer measurement time t is equal to or less than the second predetermined time (20 minutes), the blower fan 9 is used by the thermistor 8 in step 24 until the temperature in the cleaning tank 1 reaches the second predetermined temperature (40 ° C.). To operate.

On the other hand, at step 27, the timer measurement time t
Exceeds the second predetermined time (20 minutes), step 2
In step 8, tap water is supplied to the predetermined water level indicated by the water level sensor 6 by the water supply means 12, and in step 29, the heater 7 is not energized and the cleaning process is performed for the third predetermined time (1 minute). That is, the cold tap water supplied can be directly sprayed on the tableware 2 to cool the tableware 2.

As a result, under the condition that the ambient temperature surrounding the dishwasher is high, as the thermostat 14 operates, even when the blower fan 9 is operated and the expected cooling effect is not sufficiently obtained, the tableware The tableware 2 can be effectively cooled without leaving the 2 at a high temperature.

In the above embodiment, the thermostat 1
4 operates and the thermistor 8 cannot detect the second predetermined temperature even after the second predetermined time has elapsed, water is supplied to the predetermined water level by the water supply means 12 and the cleaning pump 4 is supplied until the third predetermined time elapses. However, the cleaning pump 4 may be operated until the thermistor 8 detects the third predetermined temperature (for example, 40 ° C.).

Next, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

As shown in the figure, the door 17 is provided so that it can be opened and closed in order to put the dishes 2 in and out of the washing tank 1.
The control means 18 operates the blower fan 9 in accordance with the operation of the thermostat 14, and uniquely stops the blower fan 9 when the door 17 is opened / closed for longer than the fourth predetermined time. Here, the fourth predetermined time is a time required to take out the tableware 2 and is, for example, 30 seconds.

The operation of the above configuration will be described with reference to FIG. It should be noted that steps 20 to 24 in FIG. 5 are the same as those in the above-described first embodiment, and a description thereof will be omitted.

Step 20, Step 21, Step 2
2. In step 23, the control means 18 knows that the thermostat 14 has operated, cuts off the power supply to the heater 7,
If the door 17 is not opened / closed in step 30 after the abnormality is notified and the user is alerted to start the operation of the blower fan 9, the temperature inside the cleaning tank 1 is set to 40 ° C. by the thermistor 8 in step 24. The blower fan 9 is operated until it becomes.

On the other hand, when it is determined in step 30 that the door 17 has been opened / closed, the control means 18 causes the dishes 2 in the washing tank 1 to
It is judged that the user has taken out of the tank. Here, since it is expected that the tableware 2 will be sufficiently cooled by opening and closing the door 17 even if the tableware 2 is not actually taken out of the tank, the blower fan 9 is uniquely opened in step 31. Stop the operation.

As a result, in accordance with the operation of the thermostat 14, the blower fan 9 is operated and the dishes 2 in the washing tank 1 are operated.
When the user notices the abnormality notification and takes out the tableware 2 from the cleaning tank 1 in the process of cooling the tableware 2, the cooling of the tableware 2 can be quickly stopped.

[0038]

As is apparent from the above embodiments, according to the present invention, a washing tank for storing dishes, a heater for heating washing water or air in the washing tank, and a temperature in the washing tank are provided. Thermistor (temperature detecting means) for detecting the temperature, and a blower fan (exhausting means) for sending the vapor in the cleaning tank to the outside of the tank
And a thermostat (excessive temperature rise prevention means) for shutting off energization to a heater (load) when a predetermined temperature in the cleaning tank is detected, and a series of program sequences for cleaning, rinsing and drying the dishes. And a control means,
The control means, when the thermostat operates,
Since the blower fan is operated until the first predetermined time elapses or until the thermistor detects the first predetermined temperature, the temperature in the cleaning tank is increased due to the failure of the heater drive circuit or the thermistor. If the thermostat operates due to abnormally high temperature, the blower fan is operated until the first predetermined time elapses or the thermistor detects the first predetermined temperature. It is possible to prevent discoloration or deformation of the tableware.

Further, a water supply means for supplying tap water into the cleaning tank, a cleaning nozzle for ejecting the cleaning water in the cleaning tank toward the dishes, and the cleaning water accumulated in the cleaning tank for the cleaning nozzle. And a motor for driving the cleaning pump, wherein the control means controls the water supply means when the thermostat operates and the thermistor cannot detect the second predetermined temperature even after the second predetermined time has elapsed. The washing pump is operated until the third predetermined time elapses, or until the thermistor detects the third predetermined temperature, so that the ambient temperature surrounding the dishwasher is high. Under the conditions, even if the blower fan is operated and the expected cooling effect is not obtained sufficiently with the operation of the thermostat, the prescribed water is supplied by the water supply means. Until the third predetermined time has elapsed or the thermistor detects the third predetermined temperature, the washing pump is operated, so that the tableware can be effectively removed without leaving it at a high temperature. It can be cooled and thus prevent discoloration or deformation of the tableware.

Further, it is provided with a door which is provided for opening and closing the dishes to and from the washing tank, and the control means operates the blower fan in accordance with the operation of the thermostat, and the door is operated for a fourth predetermined time or longer. When opened / closed, the blower fan is uniquely stopped.Therefore, when the thermostat operates, the blower fan is operated to cool the dishes in the washing tank, and the user notices the abnormality and cleans the dish. When the tableware is taken out of the tank, the control means knows that the door has been opened and closed and uniquely stops the blowing fan, so that the tableware can be quickly cooled.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a dishwasher according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation of the thermostat of the dishwasher and a process of processing.

FIG. 3 is a flow chart showing the operation and processing steps of the thermostat of the dishwasher according to the second embodiment of the present invention.

FIG. 4 is a system configuration diagram of a dishwasher according to a third embodiment of the present invention.

FIG. 5 is a flowchart showing the operation and processing steps of the thermostat of the dishwasher.

[Fig. 6] System configuration diagram of a conventional dishwasher

FIG. 7 is a flowchart showing an operation of the thermostat of the dishwasher and a process of processing.

[Explanation of symbols]

 1 Cleaning Tank 2 Tableware 7 Heater (Load) 8 Thermistor (Temperature Detecting Unit) 9 Blower Fan (Exhaust Means) 14 Thermostat (Excessive Temperature Overheating Prevention Means) 16 Control Means

Claims (3)

[Claims] 1. A cleaning tank for storing dishes, a heater for heating cleaning water or air in the cleaning tank, a temperature detecting means for detecting a temperature in the cleaning tank, and a steam in the cleaning tank. Exhaust means for sending out to the outside of the bath, temperature overrise preventing means for shutting off energization to the load when a predetermined temperature in the washing bath is detected, and a series of program sequences for washing, rinsing and drying steps of the tableware are controlled. And a control unit that controls the exhaust gas until the first predetermined time elapses or the temperature detection unit detects the first predetermined temperature when the temperature excess temperature prevention unit operates. Dishwasher made to work means. 2. A water supply means for supplying tap water into the cleaning tank, a cleaning nozzle for ejecting the cleaning water in the cleaning tank toward the dishes, and the cleaning water accumulated in the cleaning tank for the cleaning nozzle. And a motor for driving the cleaning pump. The control means detects the second predetermined temperature even after the second predetermined time has elapsed due to the operation of the excessive temperature rise prevention means. If not possible, water is supplied to the predetermined water level by the water supply means, and a third predetermined time elapses, or until the temperature detection means detects a third predetermined temperature,
The dishwasher according to claim 1, wherein the washing pump is operated. 3. A door provided to open and close dishes to and from the washing tank is opened and closed, and the control means operates the exhaust means in accordance with the operation of the excessive temperature rise preventing means, and the door is set to the fourth predetermined value. The dishwasher according to claim 1, wherein the exhaust means is uniquely stopped when the opening / closing is performed over a time period.