JPH0551818B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides a heating device that can detect this using a distance sensor and issue an alarm when the shelf position of a heating device is erroneously manipulated. Regarding equipment.

2. Description of the Related Art In heating devices such as electric ovens and gas ovens that raise the ambient temperature in a heating chamber and cook objects by convection heating, the baking temperature, cooking time, etc. are determined depending on the type of object to be heated. Since the shelf positions of the mounting plates are different, separate keys are generally provided on the operation panel for each type and category of the object to be heated. In other words, for oven dishes such as kutskiy, cakes, schew, and butter rolls, the user of the heating device presses separate keys on the operation panel to select the desired baking temperature and heating time, and then places the tray on the designated shelf. Set aside and start cooking.

In addition to the temperature and time, the position of the mounting plate must also be selected because the temperature distribution within the heating chamber naturally changes slightly in the height direction.
This is because there is an optimal vertical balance depending on the type of object to be heated.

Problems to be Solved by the Invention For this reason, the user of the heating device must select the desired key from among the many keys on the operation panel and select the appropriate shelf position according to the type of object to be heated. If it was placed in the wrong position, the heat balance would be disrupted and you would not be able to cook properly.
In addition, the user often does not realize that he or she has misplaced the shelf until the cooking is finished, that is, until the cooking ends in failure, and the user often ends up wiping out the ingredients.

As mentioned above, in conventional heating devices that use convection heating for oven cooking, it is necessary to press different keys depending on the type of object to be heated, such as cookies or cakes, and to set the tray correctly on the predetermined shelf position. In addition, it was unclear whether the settings were correct or not, and the user had to spend an anxious time until the cooking was completed.

In view of this background, it is an object of the present invention to realize a heating device that, when a heating command key is pressed, detects whether or not a mounting plate is set at a position suitable for the object to be heated belonging to that key, and can issue an alarm if there is an erroneous operation. It is something to do.

Means for Solving the Problems In order to solve the above problems, the present invention provides a distance measuring sensor to detect the distance to the object to be heated or the mounting plate. A plurality of heating command keys are arranged on the operation panel to select the type or category of the object to be heated. Further, an alarm means is provided to notify of incorrect insertion of the mounting plate.

Effect The heating device of the present invention has a distance sensor that detects the distance to the object to be heated or the distance to the device pan,
The control section determines the position of the mounting plate based on this distance data, and determines whether the selected heating command key is set at an appropriate position. If there is an erroneous operation, the alarm means is used to notify this.

Embodiment Hereinafter, a heating device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 2 is a perspective view of the main body of the heating device according to the present invention. A door body 2 is pivotally supported on the front surface of the main body 1 so as to be freely openable and closable, and an operation panel 3 is provided. A plurality of heating command keys 4 are arranged on this operation panel.

FIG. 1 is a block diagram showing the construction of such a heating device. The heating command input from the heating command key 4 is decoded by the control unit 5. Then, the control unit 5 uses the distance measuring sensor 6 to measure the distance D to the mounting plate 8 on which the object to be heated 7 is mounted.

A plurality of pairs of shelf rails 10 are provided on opposing side walls of the heating chamber 9, and an appropriate shelf position is selected depending on the object to be heated. For example, kutsky is on the top shelf, siews and butter rolls are on the middle shelf, and cakes are on the bottom shelf. Which shelf position is appropriate is determined mainly by the design of the heating chamber, and the optimal shelf position is determined by heat distribution to the upper and lower heaters, overall heat balance, material distribution of the dough, etc.

Now, when the mounting plate 8 is at the upper stage, the detection distance D is the smallest, and the distance D becomes larger as the mounting plate 8 moves to the middle and lower stages. In other words, by detecting the distance D, the position of the mounting plate can be determined.

The mounting tray 8 is a rectangular metal part as shown in the perspective view of FIG. 3, and the flange portion of the periphery rests on the shelf rail. The entire surface is treated with enamel to increase corrosion resistance.

Returning to FIG. 1, with the above configuration, the control section 5
can detect the position of the mounting plate 8 using the distance measuring sensor 6, and based on this determination, it is determined whether the selected mounting is suitable for the selected heating command key. do.

If the result of this judgment detects an error in the operation, the control section 5 uses the alarm means 11 to notify this. The alarm means 11 may be a buzzer, a voice synthesis circuit, or other device that emits an alarm sound, a device that displays a warning, or a combination thereof.

12 is a display section, and FIG. 4 shows an embodiment using this display section as an alarm means.

The display section 12 includes a time display section 13 and a temperature display section 1.
4, a menu name display section 15 and a shelf position display section 16.

When a heating command key is pressed, one of the corresponding menu name display sections lights up and at the same time the correct shelf position is displayed. If you set the tray incorrectly, this shelf position display will flash to warn you.

With this configuration, there is no need to add a new buzzer or the like as a warning means, and the correct shelf position to be set can be displayed, so the operability is very good.

Now, after the control unit 5 has made the above shelf position determination,
Power supply to the heating means 18 via the driver 17 is started. If there is an incorrect operation of the mounting plate, power supply to the heating means will not start.

In this embodiment, the heating means 17 is a planar electric heater arranged vertically outside the heating chamber, but it may also be an electric oven of a hot air circulation type, or of course a gas oven equipped with a gas burner. It goes without saying that the present invention can also be applied to.

Now, the control unit 5 sets the heating temperature corresponding to the input menu, and controls the power supply to the upper and lower heaters while monitoring the temperature in the heating chamber with the temperature sensor 19. Power distribution up and down and heating time are also changed according to the menu.

Reference numeral 20 indicates a distance measurement sensor detection circuit, and 21 indicates a temperature sensor detection circuit. Temperature sensor detection circuit 2
Although an A/D converter or the like is used as the control section 1, if the control section 5 is configured with a microcomputer or the like, one with a built-in A/D circuit can be used.

Next, an example of the configuration of the distance measuring sensor 6 and its detection circuit 20 will be described. FIG. 5 shows an ultrasonic sensor as an example of a distance measuring sensor.

The ultrasonic sensor includes a piezoelectric element 22 and a conical resonator 24 that engages with the piezoelectric element 22 via a coupling shaft 23.
, a terminal 26 connected to the piezoelectric element 22 by a lead wire 25, a terminal plate 27 that fixes the terminal 26, a case 28 forming an outer shell, and an opening of the case 28 on the conical resonator 24 side. Beam shaping plate 2
9 and a sound absorbing sheet 30 provided on the inner surface of the terminal board 27. (National Technical Report P.504-514 Vol.29 No.3 1983) In addition, optical sensors such as infrared sensors and photocouplers can also be used as the distance measuring sensor 6. Next, FIG. 6 shows the detection circuit 20 of the ultrasonic sensor.
FIG. 2 is a block diagram showing an example of the configuration.

The control unit 5 is composed of a microcomputer, etc., and performs timing control to
One ultrasonic sensor transmits an ultrasonic wave of several tens of kHz, and when receiving it, it is switched to a receiver.

31 is a transmitting circuit, and 32 is a receiving circuit. The comparison circuit 33 compares the reference voltage and the received signal, latches the received signal exceeding the reference voltage, and inputs it to the control section 5. The control unit 5 counts the time from transmitting the ultrasonic wave until receiving it, calculates the distance to the mounting plate or the heated object from the propagation velocity of the ultrasonic wave, and calculates the position of the mounting plate and the heated object from this. Detect the height of an object.

With the above configuration, the position of the mounting plate and the height of the object to be heated can be detected, and if the mounting plate is set at a shelf position that is not suitable for the selected heating command key,
This can be detected and an alarm can be issued.

Note that the present invention is also applicable to a so-called microwave oven, which is a combination of a microwave oven and an electric or gas oven. Regarding the heating method of the oven, in this example, only a temperature sensor was provided, but a humidity sensor etc. were also used.
Of course, a configuration that detects the completion of food is also possible.

Effects of the Invention As described above, the heating device of the present invention is equipped with a distance measuring sensor, which detects the position of the mounting plate and the height of the object to be heated, and then detects the position of the mounting plate and the height of the object to be heated. It is possible to determine whether the tray has been inserted into the correct shelf position, and an alarm can be issued if an erroneous operation is discovered.

Therefore, the user of the heating device does not have to worry about noticing the erroneous operation of the shelf position due to a failure in cooking after the heating has finished, as in the conventional case. It would be even more effective if the configuration was configured to prohibit the start of heating if the mounting plate is incorrectly inserted.

As described above, according to the present invention, the shelf position can be selected without error, and a heating device that can be operated safely can be realized.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of a heating device according to an embodiment of the present invention, Fig. 2 is a perspective view of the main body, Fig. 3 is a perspective view of the mounting tray, and Fig. 4 is a front view of the display section. 5 is a sectional view of an ultrasonic sensor as an example of a distance measuring sensor, and FIG. 6 is a circuit block diagram showing an example of the configuration of a detection circuit of the ultrasonic sensor. 4...Heating command key, 5...Control unit, 6...Distance sensor, 7...Object to be heated, 8...Place plate, 9...
...Heating chamber, 10...Shelf rail, 11...Alarm means, 18...Heating means.

Claims (1)

[Claims] 1 A heating chamber that stores an object to be heated, a heating means provided in the heating chamber, a control unit that controls power supply to the heating means, and a plurality of heating command keys that can select heating of a desired object to be heated. , a placing plate on which the object to be heated is placed, a distance sensor for detecting distance, and an alarm means, the placing plate is positioned at a predetermined height within the heating chamber, and the control unit uses the distance measurement sensor to detect the distance from the distance measurement sensor to the object to be heated or the placement plate, thereby determining the position of the placement plate in the heating chamber, and detecting whether the placement plate is If the heating device is not detected at a position determined by selection of the heating command key, the heating device is configured to notify by the alarm means.