JP4307332B2 - Electromagnetic cooker - Google Patents

Description

  The present invention relates to an electromagnetic cooker that arranges a food item on a heating coil and heats the food item by induction heating.

  In a general electromagnetic cooker, an induction heating coil is disposed under the heat-resistant glass top plate mounted on the top surface of the appliance body, and a temperature sensor is disposed at a substantially central position of the induction heating coil. Cooking is performed by heating the cooking object to the set temperature by detecting the temperature of the cooking object by the sensor and controlling the power supplied to the induction heating coil.

In addition, the electromagnetic cooker has a fried food function and a water heater function, as shown in Patent Document 1, for example. In the water heater function, boiling water control such as boiling detection is performed based on the temperature detected by the pan bottom thermistor 73 as a temperature sensor. It is carried out.
JP 2004-95295 A

  On the other hand, as shown in the above-mentioned Patent Document 1, when performing boiling water control based on the temperature detected by the temperature sensor, the temperature change accuracy of the temperature sensor deteriorates due to the material of the pan, the initial temperature of the top plate, etc. There are problems such as a long boiling time.

  Moreover, although there exist some which detect the temperature of a to-be-cooked object with an infrared sensor, there exists a problem that manufacturing cost becomes expensive in this case.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to perform boiling water control in a shorter time with a relatively inexpensive configuration.

According to a first aspect of the present invention, there is provided a heat source for heating the object to be cooked, a temperature sensor for detecting the temperature of the object to be cooked, an input means for manually inputting heating conditions by the heat source, and an input by the input means. A display means for displaying contents and the like, and a control means for controlling the heat source and the display means based on temperature data from the temperature sensor and input data from the input means. The water amount is input by the input means, and the water source is cooked by operating the heat source for a predetermined time set in accordance with the input water amount.

According to a second aspect of the present invention, in the configuration of the first aspect, the control means measures the integrated input electric energy until the temperature of the object to be cooked rises to a predetermined temperature set in advance from the start of heating. In the case where the input power amount is less than the preset set power amount, additional heating is performed .

  According to a third aspect of the present invention, in the configuration of the first or second aspect, the control means is configured to display the amount of water input from the input means on the display means.

  According to a fourth aspect of the present invention, in the configuration according to any one of the first to third aspects, the control means is configured to display the remaining time corresponding to the amount of water input from the input means by the display means. Is.

According to a fifth aspect of the present invention, in the configuration according to any one of the first to fourth aspects, the control means is operated at a maximum heating power that can be set by the input means until a predetermined time or a set time before the predetermined time . After the cooking object is heated, the heating power of the heat source is lowered and further heated.

According to a sixth aspect of the present invention, in the configuration according to any one of the first to fifth aspects, the control means is configured to respond to manual heating for setting and heating the amount of water to be cooked, and a temperature detected by the temperature sensor. it is obtained by enabling constructed switching between automatic heating to set the cooking time Te.

  According to the configuration of the first aspect of the present invention, it is configured such that the amount of water to be cooked is set and boiling water cooking is performed, so that it is influenced by the characteristic change of the temperature sensor depending on the material of the pan for storing the food to be cooked. Therefore, it is possible to perform the water heater control with higher accuracy in a relatively short time.

According to the configuration of the second aspect of the present invention, the integrated input electric energy is measured until the temperature of the object to be cooked rises to a predetermined temperature set in advance from the start of heating, and the integrated input electric energy is set in advance. When it is less than the amount, it is configured to perform additional heating, so even if the position where the cooking container is placed is misaligned or the material of the cooking container is not suitable for induction heating, boiling water control by manual heating is performed. failure in which it can be done more accurately without.

  With the configuration according to the third aspect of the present invention, the display unit displays the amount of water input from the input unit, so that the set amount of water can be easily confirmed, and it is possible to prevent spilling due to a setting error. Is something you can do.

  With the configuration according to claim 4 of the present invention, when the boiling water cooking is started, the remaining time is displayed by the display means, so that the heating time can be easily confirmed visually, and the workability of other work and the like is improved. It can be improved.

According to the configuration described in claim 5 of the present invention, after a predetermined time or until a set time before the predetermined time, after heating at the maximum heating power that can be set by the input means, the heating power is lowered and further heating is performed. By heating with a strong heating power such as 3 kW for a predetermined time and lowering the heating power before and after boiling, the heating time can be shortened and the blow-off due to bumping can be prevented. is there.

  By the configuration according to claim 6 of the present invention, it is configured to switch between manual heating for setting and heating the amount of water by input means and automatic heating controlled according to the temperature detected by the temperature sensor. It is possible to select a desired mode according to the type of container to be used, the frequency of use by the user, and the like, thereby improving usability.

  First, an embodiment according to the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes a cooker body of an electromagnetic cooker that is used in a drop-in manner, for example, in a system kitchen or the like. And a pair of left and right induction heating coils 3 and 4 and a radiant heater 5 are incorporated in the lower part of the top plate as a heat source.

  On the other hand, an operation panel 6 is disposed on the right side of the front surface of the electromagnetic cooker body 1, and a grill door 8 for the grill 7 is disposed on the left side of the operation panel so as to be freely retractable. The operation panel 6 is provided with a seesaw type power switch 9, a plurality of operation keys 10..., A push-push type operation knob 11. When the operation knob 11 is pulled out by a push operation, the energization of the induction heating coils 3 and 4 and the radiant heater 5 is started. When the operation knob 11 is pushed in, the operation is stopped. The cooking temperature is set.

  Further, the outer peripheral edge of the top plate 2 is pressed and fixed by the top plate frame 12, and an operation window 13 is perforated at the front end portion of the top plate frame, and a non-contact type touch key is formed in the operation window. The operation unit 14 configured as described above is disposed, and a pair of left and right intake and exhaust covers 15 and 15 are detachably attached to the rear end portion of the top frame 12. On the other hand, a glass plate 15 serving as an operation surface at the time of input is disposed below the operation window 13 as shown in FIG. 2, and a thermal key 16. Touch areas such as the water heater key 17 and the fried food key 18 are arranged by printing. The input operation to each key is performed by an operation circuit board (described later) disposed on the back surface of the glass plate 15, and the capacitance of the touch circuit by the touch of a finger or the like is reduced on the operation circuit board. An input operation is detected by a change.

  Further, a display 19 composed of a liquid crystal display with a backlight or the like is disposed below the front portion of the top plate 2 between the induction heating coils 3 and 4. The time and cooking temperature are displayed.

FIG. 3 shows a part of a circuit block diagram for controlling energization to the induction heating coils 3, 4, etc., and a DC conversion circuit 32 is connected to a commercial 200 V power supply 31 via the power switch 9, An inverter circuit 33 is connected to the output of the DC conversion circuit, and a series circuit of the induction heating coil 4 and coil current detection means 34 for detecting the current value supplied to the coil is connected to the output of the inverter circuit. is doing.

  Reference numeral 35 denotes a control circuit mainly composed of a microcomputer. The inverter circuit 33 and the alarm buzzer 36 are connected to the output port, and the operation panel 6 and the operation circuit board 37 are connected to the input / output ports. Connected to the storage means 38 such as a volatile memory and the input port connected to the output of the input current detection means 39 connected between the power source 31 and the DC conversion circuit 32 and the output of the DC conversion circuit 32 An output of the voltage detection means 40 and an output of a temperature sensor 41 such as a thermistor disposed at a substantially central portion of the induction heating coil 4 are connected.

  The temperature sensor 41 is configured to detect the temperature of the cooking container 42 that accommodates an object to be cooked placed on the top plate 2 via the top plate 2.

  Also, the input power is calculated from the outputs of the input current detection means 39 and the input voltage detection means 40, and these constitute an input power monitor circuit.

Thus, the operation when boiling and heating is performed according to the configuration of the present invention will be described. After the cooking container 42 is placed on the top 2 such as the induction heating coil 4, the power switch 9 is turned on, and then the operation panel is operated. Pull out the 6 of the knob 11a and-flops Tsu shoe operation, the kettle key 17 by turning on operation, to start the kettle cooking, for example, by the automatic.

On the other hand, when the hot water key 17 is further turned on, the manual hot water cooking mode is set. Here, the knob 11a is rotated and the amount of water put in the cooking container 42 is set and inputted, and then the hot water key 17 is turned on again. by operating, for starting heating is energized to the induction heating coil 4 at the output of the maximum heating power that can be set, for example, 3 k W.

  When the water amount is input, for example, as shown in FIG. 4, if the set water amount is 0.5 liter, for example, “0.5” is displayed 20. Set to 8 steps of 5, 1, 1.5, 2, 2.5, 3, 3.5, 4 and for convenience, 0.5 liter is set to “1” and 1 liter is set to “2” sequentially. The control circuit 35 is configured to display 21.

  When manual heating is set by pressing the water heater key 17 twice, for example, the above display blinks with “00”, so that the next input operation can be easily understood and the operability can be improved.

  Further, in the above embodiment, it is configured to set automatic heating when the water heater key 17 is turned on once, but is set to manual heating when it is turned on once, and is set to automatic heating when pressed twice. It is also possible to energize the induction heating coil by turning on the water heater key 17 after inputting the amount of water, and to prevent deterioration of the water heater performance due to erroneous operation or differences in operation time. However, for example, energization may be started if there is no input operation for a predetermined time after inputting the amount of water.

  On the other hand, when the induction heating coil 4 is energized in the manual hot water cooking mode to start heating, for example, as shown in FIG. 5, the remaining time is displayed on the display 20 and the display 21 is left as it is. The control circuit 35 is configured so that the amount of water can be constantly confirmed. Thereby, the remaining time can always be confirmed on the display 20, and other operations can be performed efficiently.

In addition, during boiling water cooking by the above-mentioned manual heating, for example, 60 seconds in the case of 0.5 liters and heating for a predetermined time such as 2 minutes in the case of 1 liter, the temperature sensor 41 is set from the start of heating. For example, when the integrated input power amount until the temperature rise to 98 ° C. is detected, and this input power amount is insufficient from the preset power amount for some reason such as the influence of the material of the cooking container 42 The control circuit 35 is configured to perform additional heating for the amount of insufficient power.

  With these configurations, even when the position where the cooking container 42 is placed is deviated from the center, or when the material of the cooking container 42 is not suitable for induction heating, hot water cooking is performed with little failure despite manual heating. Can improve the water heater performance.

  In the above embodiment, the cooking time setting by the water amount setting and the heating correction by the temperature sensor 41 are combined. However, the present invention is not limited to this, and it may be configured to heat only the setting time.

The insufficient power amount of the induction heating coil 4 can be measured by the difference between the input power amount detected by the input power monitor circuit and the coil current detected by the coil current detection means 34.

Further in the above embodiment, for example, as shown in FIG. 6, constitutes the control circuit 35 so as reduce the thermal induction heating coil 4 to the set time before Ta reaches the predetermined time T, for example, in 2 k W, As a result, the bumping phenomenon when the amount of water is small can be prevented, and the temperature difference between the cooking vessel 42 and the top plate 2 can be reduced, and the detection accuracy by the temperature sensor 41 can be improved.

In the above embodiment, after the predetermined time has elapsed or after the additional heating has elapsed, the buzzer 36 is operated to notify the end of boiling and cooking, and at the same time, the power supplied to the induction heating coil 4 is reduced to 0, for example. set to .5 k W, it is configured so as to warm the cooking container 42.

  In addition, in the said Example, although comprised so that the thermal power of an induction heating coil may be reduced before the set time which reaches | attains predetermined time, you may heat with the maximum thermal power for predetermined time, without being limited to this, For example, the thermal power may be reduced only when the set water amount is small.

  Further, in the above embodiment, the heating time is set based on the set water amount at the time of manual heating, but ideal temperature characteristic data at the time of automatic heating is stored, and the temperature rise characteristic detected by the temperature sensor 41 is close to the stored data. In this case, the control circuit 35 may be configured to prioritize the output of the temperature sensor and set the cooking time based on the temperature detected by the temperature sensor 41.

  With this configuration, it is possible to select the most appropriate heating mode according to the cooking conditions by automatically switching to automatic heating when the cooking conditions such as the material of the cooking container 42 are good. It is possible to improve cooking performance and shorten cooking time.

It is a perspective view which shows the Example by this invention. It is a top view which similarly shows the one Example of an operation part. It is a block diagram which similarly shows the Example of a control part. It is a front view which similarly shows the Example of a display means. It is a front view which similarly shows the Example of a display means. It is a time chart which similarly shows the characteristic and operation | movement at the time of boiling water.

Explanation of symbols

3 Induction heating coil (heat source)
4 Induction heating coil (heat source)
6 Operation panel (input means)
14 Operation part (input means)
19 Display (display means)
35 Control circuit (control means)
41 Temperature sensor 42 Cooking container (cooking object)

Claims (6)

A heat source for heating the object to be cooked, a temperature sensor for detecting the temperature of the object to be cooked, an input means for manually inputting heating conditions and the like by the heat source, a display means for displaying the input content by the input means, And a control means for controlling the heat source and the display means based on the temperature data from the temperature sensor and the input data from the input means. An electromagnetic cooker configured to perform boiling water cooking by operating the heat source for a predetermined time set in advance according to the input amount of water. The control means, the cumulative input power amount to the temperature of the object to be cooked is increased to a predetermined temperature set in advance from the start of heating was measured, the integrated input power amount is insufficient from the set power amount which is set in advance In the case, the electromagnetic cooker according to claim 1 , wherein additional heating is performed . The electromagnetic cooking device according to claim 1 or 2, wherein the control means is configured to display the amount of water input from the input means on the display means. The electromagnetic cooker according to any one of claims 1 to 3, wherein the control means is configured to display the remaining time corresponding to the amount of water input from the input means by the display means. . The control means is configured to heat the food to be cooked with the maximum heating power that can be set by the input means until the predetermined time or a predetermined time before the predetermined time, and then further reduce the heating power of the heat source to further heat. The electromagnetic cooking device according to any one of claims 1 to 4, wherein the cooking device is characterized by things. The control means is configured to be able to switch between manual heating for setting and heating the amount of water of the food to be cooked and automatic heating for setting cooking time according to the temperature detected by the temperature sensor, The electromagnetic cooker according to any one of claims 1 to 5.

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