JPH07265255A - Control device for dish drier - Google Patents

Abstract

PURPOSE:To provide a dish drier preventing the fusion of a thermal fuse under the normal operating condition and capable of securing safety even if the plugging of an intake filter or the fusion of the thermal fuse occurs. CONSTITUTION:A microcomputer 9 individually controlling a heater 2 and a fan motor 3 operates the fan motor 3 regardless of the action of an automatic power breaker 5 provided near the heater 2 and prevents the fusion of a thermal fuse 6. A monitoring means 11 detects the number of actions of the automatic power breaker 5 and informs a user of the plugging of a filter with an inspection indicator 14. When the thermal fuse 6 is fused, it is detected by a monitoring means 16, and the fan motor 3 is forcibly stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a controller for a tableware dryer for drying tableware.

[0002]

2. Description of the Related Art Generally, tableware dryers that can easily clean and dry washed tableware after meals are in widespread use.

Conventionally, a control device for this type of tableware dryer is
The configuration shown in FIGS. 7 and 8 has been common.

As shown in the figure, the tableware dryer main body 101 has a heater 102 and a fan motor 103, and a drying chamber 104 is provided on the discharge side of the fan motor 103.
In the vicinity of 02, an automatic power circuit breaker 105 that temporarily cuts off power supply when the temperature rises abnormally, and a temperature fuse 106 that melts and cuts off power supply when the temperature rises further abnormally are connected in series with the heater 102. A suction port 108 provided with a filter 107 is opened on the surface of the tableware dryer main body 101 to communicate with the intake side of the fan motor 103. A signal input means 110 is connected to the input side of the microcomputer 109, and the heater 102 and the fan motor 10 are connected to the output side.
The switch 111 to 3 is connected. The microcomputer 109 is supplied with power from a power supply circuit 112.

In the above structure, when a signal is input from the signal input means 110 to the microcomputer 109,
The heater 109 and the fan motor 103 are simultaneously energized by the microcomputer 109, and the airflow sucked from the suction port 108 is heated by the heater 102 and becomes warm air and is sent to the storage unit 104. Further, when the ambient temperature of the heater 102 is heated for some reason, the automatic power breaker 105 or the temperature fuse 106 is activated to operate the heater 1
02 and the fan motor 103 are turned off.

[0006]

In such a conventional control device for a tableware dryer, if the fan motor 103 cannot sufficiently blow air when the suction port 108 is covered,
As shown by the broken line in FIG. 2, the temperature around the heater 102 gradually rises and the automatic power breaker 105 operates,
Power to the fan motor 103 is cut off, but the heater 1
There is a problem that the ambient temperature of the heater 102 may further rise above the fusing temperature T2 of the thermal fuse 106 due to the residual heat of 02, and the thermal fuse 106 may be fused.

The intake filter 10 is used after a long period of use.
When the 7th clogging occurs, the temperature around the heater 102 rises due to the decrease in the air flow rate, so that the automatic power breaker 105 repeatedly operates. However, there is a problem that the user does not notice the clogging of the intake filter 107 and continues the abnormal use state.

Further, when the thermal fuse 106 is blown, only the fan motor 103 is operated, so that there is a problem that the fan operation is performed without heating, and the fan is used in a state where the drying function is not exhibited.

SUMMARY OF THE INVENTION The first object of the present invention is to prevent the thermal fuse from being blown out by residual heat when the temperature around the heater rises and the automatic power breaker operates.

A second object is to notify the user of this phenomenon when the temperature around the heater becomes abnormal due to clogging of the filter or the like.

A third object is to easily detect the fusing of the thermal fuse to prevent an irregular operation.

[0012]

A first means for achieving the first object of the present invention is to provide an automatic reset type automatic power breaker and a temperature fuse connected in series with a heater, and a heater in parallel with the heater. It has a fan motor to be connected, a microcomputer that individually controls the operation of the heater and the fan motor, and the automatic power breaker and the thermal fuse are installed in the vicinity of the heater to operate the automatic power breaker. Regardless, the microcomputer is configured to control the fan motor to continue to operate.

A second means for achieving the second object is a monitoring means connected in parallel with the automatic power breaker,
An alarm means for notifying an abnormality, and a microcomputer for connecting the monitoring means to the input side and connecting the alarm means to the output side. When the number of detection times of the monitoring means is a predetermined value or more, the microcomputer is The configuration is such that the notifying means is driven.

The third means for achieving the third object has a monitoring means connected in parallel with the automatic power breaker and the temperature fuse, and a microcomputer connecting this monitoring means to the input side. The microcomputer is configured to stop the operation of the fan motor and the heater when the monitoring means detects the non-energization at the start of the operation.

[0015]

According to the present invention, by the structure of the first means described above, the temperature around the heater can be prevented from rising due to the residual heat by continuing to energize the fan motor even when the automatic power breaker operates.

With the configuration of the second means, when the automatic power breaker operates due to the clogging of the filter or the like and the temperature increase around the heater, when the operating frequency is a predetermined number of times or more, the notifying means is used. It can inform you of abnormal usage.

With the configuration of the third means, the automatic power breaker is normally closed at the start of the operation, but when the temperature fuse is blown, the monitoring means detects non-energization. The detection signal allows the microcomputer to stop the operation of the fan motor.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.

As shown in the figure, the tableware dryer main body 1 has a heater 2 and a fan motor 3, a drying chamber 4 is provided on the discharge side of the fan motor 3, and a heater is provided near the heater 2 when the temperature rises abnormally. Automatic power breaker 5 that temporarily cuts off power supply to 2
Is attached, and a thermal fuse 6 is attached to cut off the energization of the heater 2 by melting when the temperature further rises.
The automatic power breaker 5 and the thermal fuse 6 are connected in series with the heater 2, and the fan motor 3 is connected in parallel with the heater 2. Further, a suction port 8 provided with a filter 7 is opened on the lower surface of the tableware dryer main body 1 and communicates with the intake side of the fan motor 3.

A signal input means 10 is connected to the input side of the microcomputer 9, and a heater switch 12a for controlling the heater 2 and a fan motor 3 are connected to the output side.
The blower switches 12b for controlling the air conditioners are connected respectively. The microcomputer 9 is supplied with power from a power supply circuit 13.

In the above configuration, first, the signal input means 10
When the timer time t1 is set, the microcomputer 9 energizes the heater 2 and the fan motor 3,
Warm air is blown into the drying chamber 4. Figure 2
As indicated by the alternate long and short dash line, the heater 2 and the fan motor 3 are energized to perform the drying operation until time t1, and the operating temperature T1 of the automatic power breaker 5 is not exceeded during the operation. Even when the timer time t1 has elapsed, the microcomputer 9 operates only the fan motor 3 for several minutes to cool the thermal fuse 6 so as not to be blown by the residual heat of the heater 2.

Next, when the suction port 8 is closed or the intake filter 7 is clogged, the fan motor 3 cannot sufficiently blow air, and as shown by the solid line in FIG. Rises above the temperature T1, the automatic power breaker 5 automatically operates to cut off the power supply to the heater 3. At this time, since the microcomputer 9 keeps the blower switch 12b closed, the fan motor 3
Continues to rotate, the temperature around the heater 2 drops, and the temperature T1
When the temperature becomes below, the heater 2 is automatically energized again. Therefore, while the fan motor 3 is operating, the heater 2 is turned on and off.
The FF operation is repeated until the timer setting time t1. That is, when the automatic power breaker 7 operates, the heater 2
However, the fan motor 3 continues to operate, the temperature rise around the heater 2 is reduced, and the thermal fuse 6 can be prevented from being blown.

As described above, according to the first embodiment of the present invention,
Even if the temperature around the heater 2 rises due to the suction port 8 being covered and the automatic power breaker 5 operates, the fan motor 3 continues to operate and cools the periphery of the heater 2 with a temperature fuse. Can be prevented from melting.

Next, a second embodiment of the present invention will be described with reference to FIG.
-It demonstrates, referring FIG. 4 and FIG. The same components as those in the first embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in the figure, the microcomputer 9
The monitoring means 11 connected in parallel with the automatic power breaker 5 is connected to the input side of the, and the inspection display 14 is connected to the output side. The monitoring means 11 includes a detection circuit 11a through which a current flows depending on the state of the automatic power breaker 5,
ON-OFF by the current flowing in the detection circuit 11a
Switch 11b for switching.

With the above-mentioned structure, the monitoring means 1 is used because the automatic power breaker 5 is in the energized state in the normal use state.
No current flows through the detection circuit 11a of No. 1 and the switch 11b
Is OFF, and the input signal from the monitoring means 11 to the microcomputer 9 is a Hi signal. However, when the amount of air blown through the suction port 8 decreases due to clogging of the filter 7 or the like, the ambient temperature of the heater 2 increases and the The power breaker 5 operates and the heater 2
Power to the is stopped. At this time, a current flows through the detection circuit 11a of the monitoring means 11 to turn on the switch 11b,
The Lo signal is input from the monitoring means 11 to the microcomputer 9. However, since the fan motor 3 continues to operate, the periphery of the heater 2 is rapidly cooled, the automatic power breaker 5 is turned on again, and the Hi signal is input from the monitoring means 11 to the microcomputer 9. That is, since the temperature around the heater 2 is repeatedly turned on and off at regular intervals as shown by the solid line in FIG. 2, the microcomputer 9 causes the automatic power breaker 5 until the timer setting time t1.
When the number of operations is read from the monitoring means 11 and the number of operations is three or more, the inspection display 14 is turned on as shown in steps 32 to 34 of FIG. Further, when the number of times of operation of the automatic power breaker 5 is large, the power supply to the heater 2 may be stopped.

Thus, according to the second embodiment of the present invention,
When the amount of air blown from the suction port 8 decreases due to clogging of the filter 7 or the like, the phenomenon that the frequency of operation of the automatic power cutoff device 5 increases is used, and abnormal use is detected by the number of times of operation, which reduces the amount of air blown The check indicator 14 can be turned on to notify the user that the user is not in a proper usage state.

In the present invention, the check indicator 14 is used as the notification means for notifying the user of the ambient temperature of the heater 2, but a buzzer or the like may be used as the notification means.

Next, a third embodiment of the present invention will be described with reference to FIGS. 3, 5 and 6. The first
The same components as those in the embodiment and the second embodiment are designated by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG.
An automatic power breaker 5 and a thermal fuse 6 are provided on the input side to
Is connected in parallel with the monitoring means 16, and the output side is connected with a fusing indicator 15 which is turned on when the thermal fuse 6 is blown. Further, the monitoring means 16 is the automatic power breaker 5
A detection circuit 16a in which a current flows depending on the above state and a switch 16b which is turned on and off by a current flowing in the detection circuit 16a.

With the above configuration, first, when the timer time t1 is set by the signal input means 10, the microcomputer 9 reads the signal from the monitoring means 16. At the start of normal operation, the automatic power breaker 5 is in the ON state, and the thermal fuse 6 is in the energized state. Therefore, no current flows in the detection circuit 16a of the monitoring means 16, and the switch 16b is OFF, so that the monitoring means 16 The signal input to the microcomputer 9 from is a Hi signal. At this time, as shown in the third embodiment, the operating state of the automatic power breaker 5 can be detected to detect the abnormal use state. Next, when the thermal fuse 6 is blown, the monitoring means 1 is immediately after the start of operation.
Since a current flows through the detection circuit 16a of No. 6, the switch 16
b is turned on, and the monitoring means 16 causes the microcomputer 9
Lo signal is input to. Therefore, the microcomputer 9 can easily determine whether or not the thermal fuse 6 is blown. Therefore, if it is detected that the thermal fuse 6 is blown, steps 22 to 24 in FIG.
, The microcomputer 9 immediately turns off the heater switch 12a and the blower switch 12b,
At the same time, the fusing indicator 15 is turned on.

Thus, according to the third embodiment of the present invention,
The signal from the monitoring means 11 causes the microcomputer 9 to
Since the thermal fuse 6 can easily determine the fusing, it is possible to immediately stop the irregular operation of only the blowing and turn on the fusing indicator 15 to notify the user.

[0033]

As is apparent from the above embodiments, according to the present invention, when the temperature around the heater rises due to the suction port of the tableware dryer being covered, the automatic power breaker. Thus, it is possible to provide a controller for a tableware dryer that can prevent the thermal fuse from being blown due to residual heat by cutting off the power supply to only the heater and rotating the fan motor.

Further, when the automatic power breaker repeatedly operates due to the temperature rise around the heater, the frequency of operation thereof can be detected to notify the user of an abnormal use state such as clogging of the filter. A dryer control device can be provided.

Further, the microcomputer can detect an abnormal use state such as clogging of the filter from the monitoring means having a simple structure, and can easily detect the fusing of the temperature fuse to immediately stop the irregular operation only by blowing air. It is possible to provide a control device for a tableware dryer that can do this.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a controller for a tableware dryer according to a first embodiment of the present invention.

FIG. 2 is a temperature characteristic diagram around a heater of the tableware dryer of the first and second embodiments.

FIG. 3 is a sectional view of the tableware dryer of the first to third embodiments.

FIG. 4 is a circuit diagram of a controller for a tableware dryer according to the second embodiment.

FIG. 5 is the same circuit diagram of the third embodiment.

FIG. 6 is the same flowchart of the second and third embodiments.

FIG. 7 is a circuit diagram of a conventional controller for a tableware dryer.

FIG. 8 is a sectional view of the tableware dryer.

[Explanation of symbols]

 2 heater 3 fan motor 5 automatic power breaker 6 temperature fuse 9 microcomputer 11 monitoring means 14 inspection indicator 16 monitoring means

Claims (3)

[Claims] 1. An automatic reset type automatic power source breaker and a temperature fuse connected in series to a heater, a fan motor connected in parallel with the heater, and a microcomputer for individually controlling the operation of the heater and the fan motor. The automatic power cutoff device and the temperature fuse are installed in the vicinity of the heater, and the microcomputer controls the fan motor to continuously operate the fan motor regardless of the operation of the automatic power cutoff device. Control device. 2. A monitoring means connected in parallel with the automatic power circuit breaker, a notification means for notifying an abnormality, and a microcomputer for connecting the monitoring means to an input side and the notification means to an output side. 2. The control device for a tableware dryer according to claim 1, wherein the microcomputer drives the notifying unit when the number of detections by the monitoring unit is a predetermined value or more. 3. An automatic power breaker and a temperature fuse are connected in parallel, and a microcomputer connecting this monitoring means to the input side is provided. This microcomputer is de-energized by the monitoring means at the start of operation. The control device for the tableware dryer according to claim 1 or 2, wherein the fan motor and the heater are stopped when they are detected.