JP4790671B2 - Cooker - Google Patents

Description

The present invention relates to a heating cooker that heats an object to be heated by supplying heat from a heating source to a heating chamber that accommodates the object to be heated, and particularly enables steam supply to the heating chamber at an arbitrary timing. Related to improved technology.

  There is a heating cooker that heats a heating chamber containing an object to be heated with a heater and supplies steam to the heating chamber to perform cooking (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 7-39714

  The heating cooker disclosed in Patent Document 1 makes it possible to perform efficient cooking by filling the heating chamber with steam in parallel with the heat treatment by electric heat. In addition to this, there is also a heating cooker having a high-frequency heating function in addition to the steam generating function. In such a heating cooker, cooking can be performed by appropriately combining electric heating and heating by high frequency.

  In the heating cooker as described above, the steam supply to the heating chamber is an alternative selection method of always supplying during heating or not supplying. In some automatic cooking modes, a predetermined amount of steam is supplied at a predetermined timing. However, the timing and supply amount of steam to the heating chamber is required to be finely adjusted by the operator of the cooking device depending on the preference and the quality and quantity of the cooking materials. Even in cooking, cooking is not necessarily performed as expected because cooking is performed based on a standard amount of standard cooking material and an optimum setting value in an average temperature and humidity environment. In particular, when cooking bread such as French bread and sponge cake, the workmanship of cooking may be greatly affected by the timing of steam supply, making automation difficult.

  Furthermore, when grilling to heat meat, fish, etc., the temperature difference between the surface of the object to be heated and the inside tends to increase, and the surface becomes overheated, while the inside may become insufficiently heated. there were. Therefore, by supplying steam to the heating chamber, it is possible to suppress the burning of the surface of the object to be heated by the latent heat and heat capacity of the steam, and to heat the inside of the object to be heated evenly. The steam supply could not be performed at the necessary timing according to the intention of the person, and a sufficient effect by the steam supply could not be obtained.

In addition, there is a heating cooker with a steam supply source such as a boiler provided outside the heating chamber, but in this configuration, the boiler must be preheated before cooking. It takes a long preparation time. Further, since supplying steam from the heating chamber outside, such as scale accumulates in the heating unit, on causing hygienic problems, trouble such as decomposition to clean the scale takes usability is not good.

  In addition, it may be possible to increase the steam generation capacity of the steam supply source so that steam can be supplied instantaneously. However, the apparatus itself is increased in size, and costs are reduced or saved for cooking appliances for general households. It is not preferable from the viewpoint of energy.

  The present invention has been made in view of the above circumstances, and has an object to provide a cooking device capable of supplying steam to a heating chamber at an arbitrary timing while having a low power and a small configuration. Yes.

A heating cooker according to the present invention is a heating cooker that supplies heat to a heating chamber that accommodates an object to be heated and grill-heats the object to be heated, and includes heating means for heating the grill and steam in the heating chamber. A steam generator to be supplied; an evaporator heater for heating the steam generator; water supply means for supplying water to the steam generator; and heating control of the evaporator heater; A steam supply operation means that is a switch for supplying water to the generator, and a control section that is supplied with electric power from a power supply section connected to a commercial power supply, wherein the control section supplies steam from the steam supply operation section. When there is a request and the sum of the amount of power supplied to the heating means and the amount of power supplied to the evaporation section heater exceeds the rated power of the heating cooker, the amount of power supplied to the heating means is limited and the evaporation section Excellent power supply to the heater And the steam generating unit is configured to keep the object to be heated during cooking by the heating means for heating the grill so as to suppress a temperature difference between the surface and the inside of the object to be heated. A heating chamber temperature sensor for detecting the temperature of the heating object and a heated object temperature sensor for detecting the temperature of the object to be heated. The control unit increases the amount of power supplied to the evaporation unit heater when the temperature detection value by the heated object temperature sensor is equal to or higher than a predetermined temperature, and the steam supply operation means performs a predetermined time by a single operation. The necessary amount of steam is continuously supplied according to the cooking content of the object to be heated.

According to such a configuration, when the temperature of the heating chamber or the surface temperature of the object to be heated is equal to or higher than a predetermined temperature, the amount of power supplied to the evaporation section heater is increased and steam is generated, and the surface temperature of the object to be heated The rise is suppressed by the supplied steam, and excessive scoring can be prevented. Further, the steam supply operation means can supply steam in a simple manner with a single operation by supplying a necessary amount of steam according to the cooking content of the heated object continuously for a predetermined time by one operation .

  As described above in detail, according to the heating cooker according to the present invention, a steam generation unit including an evaporation unit heater is provided in the heating chamber, and water can be supplied to the steam generation unit by water supply means. The steam supply operation means enables steam to be supplied from the steam generator to the heating chamber at an arbitrary timing, so that steam can be supplied without using a boiler that requires preheating, and the timing restriction is eliminated. Can do. As a result, it is possible to supply steam with a low power and a small configuration, and it is possible to supply steam at an arbitrary timing, thereby enhancing the flexibility of cooking.

Hereinafter, preferred embodiments of a heating cooker and a control method thereof according to the present invention will be described in detail with reference to the drawings.
FIG. 1 is a front view showing a state where an opening / closing door of a heating cooker according to the present invention is opened, FIG. 2 is a control block diagram of the heating cooker, and FIG. 3 is a front view showing a switch arrangement example of an operation panel.

  As shown in FIG. 1 to FIG. 3, the heating cooker 100 heats the object to be heated by supplying at least one of heat and steam from a heating source to a heating chamber 11 that houses the object to be heated. As shown in FIG. 1, the cooking device is a magnetron (high frequency generator) 13 that generates high frequency, which is one of the heating sources, a steam generator 15 that generates steam in the heating chamber 11, and heating. An upper heater 17 that is disposed above the chamber 11 and is one of preheating means and a heating source, and a steam supply switch 19 (see FIG. 3) as steam supply operation means are provided as basic components.

  The high frequency from the high frequency generation part 13 is disperse | distributed to the whole heating chamber 11 by the stirrer blade 23 for the electric wave stirring which is rotationally driven. The steam generator 15 is configured to be supplied with water from a water supply tank 27 provided on the side of the heating chamber 11.

  The steam generation unit 15 is provided on at least one corner on the back side of the bottom surface of the heating chamber 11. In the present embodiment, as an example, a configuration in which two units are arranged at both rear corners is shown, but a configuration in which one unit is arranged on one side may be used. A heating chamber temperature sensor 31 such as a thermistor or an infrared sensor is attached to the back side surface of the heating chamber 11 to measure the temperature of the heating chamber 11. A heated object temperature sensor 32 such as an infrared sensor is attached to the back side of the heating chamber 11 to measure the temperature of the heated object.

  The heating cooker 100 of the present invention includes an indoor air heating unit 37 including a circulation fan 33 that stirs and circulates the air in the heating chamber 11 and a convection heater 35 that heats the air circulated in the heating chamber 11. It may be attached. The operation of each of these units is performed by a control command from the control unit 39 including a microprocessor.

  Further, an operation panel 91 provided as an example in FIG. 3 provided on the open / close door 41 includes a start switch 93 for instructing the start of heating, a cooking switch 94 for manual mode, and an automatic cooking switch for selecting a cooking program prepared in advance. 97, in addition to various operation switches such as the steam supply switch 19, a lamp 98, which is one of notification means 99 for notifying the steam supply status, is provided.

  And the control part 39 is supplied with electric power from the power supply part 40 connected to a commercial power supply, so that the heating power of the high-frequency generator 13, the upper heater 17, the steam generator 15, etc. does not exceed the allowable power value. The power distribution to each part is controlled.

  The heating chamber 11 is formed inside a box-shaped main body case 10 that is open on the front surface, and an open / close door 41 with a translucent window 41 a that opens and closes a heated object outlet of the heating chamber 11 on the front surface of the main body case 10. Is attached to open and close.

  The high-frequency generator 13 is disposed in a space below the heating chamber 11, and a stirrer blade 23 is provided at a position that receives a high-frequency generated from the magnetron at the substantially center of the bottom surface of the heating chamber 11. The high frequency generator 13 and the stirrer blade 23 are not limited to the bottom of the heating chamber 11 but can be provided on the other surface side of the heating chamber 11. Moreover, it is good also as a structure provided with the turntable instead of the stirrer blade | wing 23. FIG.

  The steam generation unit 15 includes a heating block (metal base) 45 having a water reservoir recess (heating surface) 45a that generates steam by heating.

Here, the basic principle of steam generation in the heating cooker 100 will be briefly described.
FIG. 4 is an explanatory diagram showing the basic principle of steam generation in the cooking device.
According to this, the water stored in the water supply tank 27 is supplied to the water supply pipe 51 through the check valve 49. In the intermediate pipe 51a of the water supply pipe 51, the heat in the sheath heater 53 of the heating block 45 is transferred to heat the water in the intermediate pipe 51a. A part of the heated water boils when it becomes hot water, generates bubbles, and rapidly expands in volume. At this time, the check valve 49 on the water supply tank 27 side of the water supply pipe 51 is closed, and backflow to the water supply tank 27 side is prevented. Accordingly, the volume-expanded water is intermittently supplied to the discharge side pipe 55. As a result, the water level rises in the discharge side pipe 55, and excess steam is discharged from the air vent hole 57 formed in the upper part, and the heated water is discharged from the discharge port 59 to the water concavity 45 a of the heating block 45. Intermittently.

  On the other hand, the water reservoir 45 a is also heated by the sheathed heater 53, and the dropped heated water is evaporated here and supplied to the heating chamber 11. In other words, the water is supplied to the water reservoir 45a by the heat generated by the sheathed heater 53 of the heating block 45, and the water reservoir 45a is heated. Thus, since heated water is supplied to the water reservoir 45a, steam can be generated in a shorter time.

A specific configuration example for realizing the steam generation will be described in detail below.
FIG. 5 shows an external perspective view of the heating block. (A) is an upper surface side, (b) is a back surface side.
The heating block 45 is a die cast product of aluminum that is lightweight and has high thermal conductivity. In the heating block 45, a U-shaped sheathed heater 53 is embedded in the body 61 as an evaporating section heater. A heating part 45 b that covers the intermediate pipe 51 a of the pipe 51 is formed. The water reservoir 45a and the heating part 45b are integrally formed by die casting, and there is no connection surface or the like, so that the heat generated by the sheathed heater 53 can be conducted with high efficiency.

  That is, at least a part of the sheathed heater 53 is embedded in the heating block 45, and the steam generating unit 15 and the sheathed heater 53 are integrated, so that there is no connection surface and the sheathed heater 53 is highly efficient. Is transmitted to the heating block 45, and a high evaporation effect in the water reservoir 45a is obtained. Further, the heating block 45 is formed by aluminum die casting and integrated with a metal material having high thermal conductivity, so that the heat of the sheathed heater 53 can be transferred to the water reservoir 45a with high efficiency. .

  Further, a thermistor 65 as an evaporating dish temperature sensor for detecting the temperature is inserted into the accommodation hole 63 located below the water reservoir 45a, and the temperature in the vicinity of the sheathed heater 53 of the main body 61 is measured. An opening hole 67 is formed on one end of the water reservoir 45a, and water from the discharge port 59 (see FIG. 4) is supplied into the water reservoir 45a. In addition, the shape, attachment position, etc. of the sheathed heater 53, the heating part 45b, etc. can be suitably changed according to the heating amount required, the installation space in the housing | casing of the heating cooker 100, etc. The sheathed heater 53 may be another type of heater such as a wire heater or a ceramic heater.

  The steam generation unit 15 is configured to supply steam from the bottom surface of the heating chamber 11 and efficiently diffuse the steam in the heating chamber 11. The surface of the water recess 45a of the heating block 45 is treated with a hydrophilic material containing silicic acid (SiO2), etc., so that a large contact area can be secured without generating water in a spherical shape, and more steam is generated. It is easy to let them. Moreover, even if dirt adheres, it can be easily removed. For example, in the process of steam generation, calcium, magnesium, chlorine compounds, etc. in the water may be concentrated and settled and fixed to the bottom of the water reservoir 45a, but the water reservoir 45a is open in the heating chamber 11. Therefore, such dirt can be wiped cleanly only by wiping the water reservoir 45a with a cloth or the like.

Here, in order to explain the water supply path from the water supply tank 27 to the heating block 45 shown in FIG. 1, FIG. 6 shows a view in the direction of arrow B in FIG.
4 is similar to FIG. 4 illustrating the principle of steam generation described above, but the water in the water supply tank 27 is supplied to the water supply pipe 51 through the check valve 49 and heated by the heating unit 45b of the heating block 45 to be discharged on the discharge side pipe 55. To be supplied. The heated water is intermittently supplied from the discharge port 59 to the water reservoir recess of the heating block 45. As the water supply pipe 51, a material having high thermal conductivity such as a copper pipe is preferably used particularly in the vicinity of the heating unit 45b that receives heat transfer. The water supply tank 27, the check valve 49, the water supply pipe 51, the heating unit 45 b, and the discharge side pipe 55 constitute a water supply means 69.

  The steam supply switch 19 controls the heating of the sheathed heater 53 when pressed, and supplies water to the steam generating unit 15 by the water supply means 69. If the temperature of the water reservoir 45a is already detected by the temperature detection from the thermistor 65, the heating of the sheathed heater 53 may be omitted. In this way, the steam supply operation means functions as one switch (steam supply switch 19), and when the steam supply switch 19 is pressed, the sheathed heater 53 is controlled to be heated, and at the same time, water is supplied by the water supply means 69. Supplied. That is, steam can be generated by one-touch operation with a single switch, steam supply operation to the heating chamber 11 becomes extremely simple, and delicate cooking tamming can be avoided.

  Therefore, the cooking device 100 can supply steam without using a boiler or the like that requires preheating, and can supply steam into the heating chamber at an arbitrary timing and with good responsiveness. Accordingly, it is possible to supply steam with a low power and a small configuration, and it is possible to supply steam at an arbitrary timing, thereby enhancing the flexibility of cooking.

Here, various operation examples of the steam supply switch 19 will be described. The steam supply switch 19 is basically a switch that can generate steam by a one-touch operation. As a detailed operation example, the following variations can be given. FIG. 7 shows an operation example corresponding to the switch operation in (a) to (c).
As shown in FIG. 7A, the steam supply switch 19 can be a switch that continuously supplies steam for a predetermined time by being pressed once. By setting it as such an operation switch, when it is pressed once, the steam is continuously supplied for a predetermined time t, and the steam can be easily supplied with one touch.

  Further, as shown in FIG. 7B, the steam supply switch 19 can be an operation switch that switches between a steam supply start and a steam supply stop each time it is pressed. By using such an operation switch, the steam supply start and the steam supply stop are switched each time the switch is pressed, and the steam supply for an arbitrary period can be easily performed.

  Further, as shown in FIG. 7C, the steam supply switch 19 can be an operation switch that supplies steam only while being pressed. By setting it as such an operation switch, steam supply is performed only while it is pressed, and it becomes possible to easily supply steam for an arbitrary period with one touch.

  In addition, the steam supply time may be set only for a certain period after the steam supply switch 19 is pressed. Specifically, when the steam supply switch 19 is pressed, the steam supply time of 1 minute, 3 minutes, 5 minutes, etc. is switched every time the switch is pressed for a certain period of time so that it can be selectively set. To do. Alternatively, the steam supply time is arbitrarily designated by operating the knob 96 (see FIG. 3) of the operation panel 19 by setting the steam supply time input mode for a certain period after the steam supply switch 19 is pressed, and the fixed period has elapsed. Later, the designated steam supply time is set as an input value. According to this, the steam supply time can be easily set to an arbitrary time according to cooking, and the usability is improved.

  The notification means 99 can be notified visually or by sound or both by using an LED or a buzzer. The notification means 99 operates to perform notification for limiting the steam supply request from the steam supply switch 19 when the temperature of the heating chamber 11 is equal to or lower than a predetermined temperature under the control of the control unit 39. In this case, for example, when an LED is used, notification is performed by a blinking operation or the like. Therefore, for example, when steam is to be supplied by the steam supply switch 19 when the temperature of the heating chamber 11 is equal to or lower than a predetermined temperature, the notification means 99 is activated, and steam supply can be restricted. Thereby, when the heating chamber temperature is low, the steam is supplied as usual even though the heating chamber temperature is low, and the dew condensation in the heating chamber is prevented from increasing.

  In addition, the notification means 99 notifies that the steam is being supplied while supplying steam to the heating chamber 11. In this case, for example, when an LED is used, notification is performed by a lighting operation or the like. Therefore, when evaporation is supplied, the notification means 99 notifies that, and it becomes possible to reliably grasp the steam supply state that is difficult to visually recognize from the appearance of the heating cooker 100, and the safety against high-temperature steam is improved.

Next, the operation of the cooking device 100 according to the present invention will be described.
For example, in order to supply steam while performing grill heating using the heating cooker 100 of the present invention, an object to be heated is placed in the heating chamber 11, the open / close door 41 is closed, and various switches provided on the operation panel 91 are set. After operating to set a desired heating mode, the start switch 93 is pressed. When heating is performed in the automatic cooking mode, the cooking content (cooking program) prepared in advance in the storage unit 95 (see FIG. 2) is selected by pressing the automatic cooking switch 97, and then the start switch 93 is pressed. Press.

  When the upper heater 17 starts to generate heat in response to pressing of the start switch 93, the object to be heated is heated by radiant heat. On the other hand, the high frequency generated from the high frequency generator 13 is diffused and supplied into the heating chamber 11 by the rotation of the stirrer blade 23. Thereby, the generated high frequency is supplied to the heating chamber 11 to heat the object to be heated at high frequency. Depending on the heating target, a high-frequency absorber may be disposed in the heating chamber 11 and heat generated by the high-frequency absorber may be supplied to the object to be heated.

  Furthermore, if necessary, the convection heater 35 of the room air heating unit 37 is heated to rotate the circulation fan 33, whereby the object to be heated can be heated more uniformly at a high temperature.

  Here, at the time of the heating, the control unit 39 controls the steam in accordance with the temperature detected from the thermistor 65 of the heating block 45, the heating chamber temperature sensor 31 that detects the temperature in the heating chamber, or the temperature sensor 32 to be heated. The generated amount and heater heating amount are feedback-controlled, and the temperature and steam amount in the heating chamber 11 are set appropriately. Thereby, it is possible to easily perform egg cooking and the like whose temperature is difficult to control.

In the cooking device 100, the steam supply switch 19 can supply only the necessary amount of steam according to the cooking content of the object to be heated under the control of the control unit 39.
According to such a control method, a necessary amount of steam required for cooking contents of the object to be heated is supplied. In other words, since the cooking time is specified in advance in automatic cooking, the required amount of steam is known, and if only that amount is supplied, the deterioration of workmanship due to insufficient supply or excessive supply is reduced, and there is no waste. Cooking is possible. In addition, when the steam supply switch 19 is pressed during cooking, the amount of steam required for cooking after the time of pressing is calculated according to the elapsed time and the heating temperature, and the amount of steam is supplied. You can also.

Furthermore, the heating cooker 100 controls the control unit 39 to control the amount of power supplied to the sheathed heater 53 of the heating block 45 according to the temperature detection value of the heating chamber 11 by the heating chamber temperature sensor 31 (with a continuous heating time described later). May be increased or decreased.
According to such a control method, when the temperature of the heating chamber 11 is higher than a predetermined value, the amount of power supplied to the sheathed heater 53 during steam generation is reduced, and the temperature detection value of the heating chamber 11 is lower than the predetermined value. The amount of power supplied to the sheathed heater 53 is increased. Thus, the responsiveness from the pressing of the steam supply switch to the supply of steam can be improved regardless of the temperature of the heating chamber 11. That is, the heating chamber 11 when the required number of heating amount at a low temperature, increasing the heating amount of the sheathed heater 53, quickly water is to be evaporated. On the other hand, when the heating chamber 11 is at a high temperature, the temperature of the water reservoir 45a of the heating block 45 has already been raised to such an extent that the water evaporates. .

In addition, the cooking device 100 may increase or decrease the amount of steam generated according to the temperature detection value by the heated object temperature sensor 32 under the control of the control unit 39.
According to such a control method, when the surface temperature of the object to be heated is equal to or higher than a predetermined temperature, the amount of power supplied to the sheathed heater 53 of the heating block 45 is increased and water is supplied to the water reservoir 45a. Due to the generated steam, the surface temperature of the object to be heated is prevented from rising by the supplied steam, and excessive scoring can be prevented.

The heating cooker 100 is controlled by the controller 39, the heating chamber temperature sensor 31 to the temperature detection signal from the least even one of the heated object temperature sensor 32 is outputted steam supply to the heating chamber 11 You may make it restrict | limit.
According to such a control method, least supply of steam limitations in temperature unmanageable state under from one to the detection signal of a predetermined temperature is the output of the heating chamber temperature sensor 31 or the heated object temperature sensor 32 is, for example, the temperature of the heating chamber 11 is rather low, despite the time slow evaporation rate, are excessively prevented from water is supplied. Accordingly, it is possible to prevent the steam from being supplied as usual even though the heating chamber temperature is low, thereby increasing the condensation in the heating chamber.

  Furthermore, in the heating cooker 100 of the present embodiment, since two steam generators 15 are provided at the bottom corner of the heating chamber 11, the amount of steam generated according to the heating content of the object to be heated can be varied. It is possible to classify what needs a large amount of steam, what needs only a small amount, and the like, and it is possible to arbitrarily set a steam supply pattern so that a desired steam supply amount is obtained.

Next, examples of heat treatment using the above-described heating cooker 100 will be exemplified, and the remarkable effects of the present invention that are exhibited by each heat treatment will be described in detail in order.
For example, in the oven cooking heating pattern, preheating is performed by supplying power to the circulation fan 33 and the convection heater 35 or the upper heater 17 for a predetermined time in the initial stage of heating. After the preheating is completed, the heating chamber 11 is heated by supplying power to the circulation fan 33 and the convection heater 35 and, if necessary, the upper heater 17. When the steam supply switch 19 is pressed at an arbitrary timing, power is supplied to the sheathed heater 53 of the heating block 45 and water is supplied to the water reservoir 45a. As a result, the water supplied to the water reservoir 45 a is evaporated by receiving heat from the sheathed heater 53, and steam is supplied into the heating chamber 11. The temperature change in the heating chamber 11 in such a heating pattern is that when the door is opened and the object to be heated is placed in the heating chamber 11 after the preheating is completed, the temperature in the heating chamber is temporarily lowered. The temperature rises steeply and quickly approaches the desired set temperature.

  Further, by performing a pre-heat treatment for heating the heating chamber 11 in advance before cooking, steam can be generated quickly when the steam supply switch 19 is pressed. Thereby, it becomes possible to supply steam at a necessary timing. The preheating can be performed by the upper heater 17 or the convection heater 35, but it is preferable to perform the preheating by the upper heater 17 because the heating chamber 11 can be directly heated.

  In addition, when heating in oven cooking, as shown in FIG. 8, power is basically supplied to the upper heater (heater A) 17 and the convection heater (heater B) 35. Power is supplied to the sheathed heater 53 of the heating block 45. In that case, for example, any one of the heaters (for example, heater A) and the sheathed heater 53 are alternately heated, and the total power required for the heat generation of each heater does not exceed the allowable power value of the cooking device 100. Set to maximum. Thereby, heating can be continued within the allowable power range without interrupting heating for oven cooking for a long time, and the cooking time can be shortened by maximizing the heating effect.

Further, when the steam supply switch 19 is pressed at an arbitrary timing, when the water reservoir 45a of the heating block 45 is not heated to evaporate water, the steam supply amount is increased rapidly, so that the predetermined time is continuous. Thus, it is preferable to heat the sheathed heater 53 of the heating block 45. Therefore, as shown in FIG. 9, when the steam supply switch 19 is pressed at an arbitrary timing after the start of the heater heating, the sheath heater 53 is continuously supplied with power ta for a predetermined time. During this predetermined time ta, for example, the output of the heater A is stopped or the output level is lowered to set the total power so as not to exceed the allowable power value. Thereafter, the output of the heater A that has been stopped or the output level has been lowered is switched to the output control of the alternating power supply as shown in FIG. Then, after the steam supply is completed, the heaters A and B are continuously output in the same manner as when the heater heating is started. The length of the predetermined time ta is the sheathed heater 53 of the heating block 45 described above.
Similarly to the increase / decrease control of the amount of power supplied to the heater, it is set longer when the temperature is lower and shorter when the temperature is higher, according to the temperature of the heating chamber 11 and the temperature of the object to be heated.

  By the above control, the steam generating unit 15 is preferentially heated, and the heating effect can be maximized while ensuring the supply of steam within a range not exceeding the rated power of the cooking device 100. Note that the temperature of the heating chamber and the temperature of the object to be heated do not change so much even when the power supply for heating is stopped for a short time in the upper heater 17. This control uses this fact to preferentially heat the steam generation unit 15 and aim to generate steam more quickly.

Next, an example of grill cooking will be described.
In grill cooking, an object to be heated is placed and heated so that the object to be heated is burnt by the heat generated by the upper heater 17. In this case, the temperature change of the object to be heated after the main heating is started after preheating increases the temperature quickly by heating on the upper surface, but the rate of temperature increase by heating is slow inside the object to be heated. The temperature difference between the inside and the inside tends to gradually increase from the start of heating. That is, the upper surface of the object to be heated close to the upper heater 17 is heated relatively steeply by heating, but it takes time until the heat of the surface of the object to be heated is transferred to the inside of the object to be heated. The rate of temperature rise is low.

  Therefore, as shown in FIG. 10, by supplying steam into the heating chamber at any timing during the main heating, steam lower than the surface temperature of the object to be heated is applied to the object to be heated. The temperature can be temporarily lowered (decrease of ΔT1). On the other hand, in the inside of the object to be heated, the heat capacity is about twice as large as that of the air in the heating chamber, and steam higher in temperature than the inside of the object to be heated is applied to the object to be heated. Heat is transferred well, and the temperature of the object to be heated can be accelerated (temperature increase of ΔT2). Thereby, the temperature difference between the surface of the article to be heated and the inside can be kept small.

  In addition, steam supply during heating has the effect of moistening and softening the heated object when supplied in the first half of cooking, and when supplying in the latter half of cooking, the steam supply is heated. It has the effect of improving the internal fire passage and uniformizing the color of baking. Even if the surface of the object to be heated has irregularities, the steam prevents the local unevenness of the object to be heated from entering the unevenness and makes the baking condition uniform. In the case of heating with the upper heater 17, the amount of heating is reduced with respect to the portion that is the shadow of the unevenness, but such unevenness is less likely to occur by using the steam heating together. Furthermore, the heating unevenness of the upper heater 17 with respect to the heating chamber, that is, the amount of heating at the center of the heating chamber increases, and the amount of heating at the corner of the heating chamber decreases. It is possible to prevent an object from being heated excessively and scorching, and an object to be heated located in the corner of the heating chamber from being finished in a state of insufficient heating.

  Each heating pattern described above is stored in advance as a cooking program in the storage unit 95 connected to the control unit 39 shown in FIG. 2, and is arbitrarily selected and executed by operating the automatic cooking switch 97 or the like of the operation panel 91. It is good also as composition to do. Even in that case, the temperature of the object to be heated in the heating chamber is detected by the heating chamber temperature sensor 31, and the elapsed time such as the heating time is measured by the timer 101 according to the temperature of the object to be heated. Set the control timing of each part. As described above, the steam generation timing is automatically set based on a preset cooking program in addition to the configuration in which the supply is started at an arbitrary timing when the steam supply switch 19 is pressed. It may have a function.

  As described above in detail, according to the heating cooker according to the present invention, a steam generation unit including an evaporation unit heater is provided in the heating chamber, and water can be supplied to the steam generation unit by water supply means. The steam supply operation means enables steam to be supplied from the steam generator to the heating chamber at an arbitrary timing, so that steam can be supplied without using a boiler that requires preheating, and the timing restriction is eliminated. Can do. As a result, it is possible to supply steam with a low power and a small configuration, and it is possible to supply steam at an arbitrary timing, thereby enhancing the flexibility of cooking.

It is a front view which shows the state which opened the opening-and-closing door of the heating cooker which concerns on this invention. It is a control block diagram of a heating cooker. It is a front view which shows the switch array example of an operation panel. It is explanatory drawing showing the basic principle of the steam generation of a heating cooker. In the external view of a heating block, (a) is an upper surface side, (b) is a perspective view of the back surface side. It is a B direction arrow line view of FIG. It is operation | movement explanatory drawing which showed the operation example according to switch operation with (a)-(c). It is explanatory drawing of the electric power feeding condition at the time of normal vapor | steam supply. It is explanatory drawing of the electric power feeding condition at the time of the steam supply of arbitrary time. It is a graph which shows the temperature change of the to-be-heated material at the time of steam supply.

11 Heating chamber 13 High frequency generator (heating source)
15 Steam generator 17 Upper heater (heating source)
19 Steam supply switch (steam supply operation means)
31 Heating chamber temperature sensor 32 Heated object temperature sensor 35 Convection heater (heating source)
45 Heating block (metal base)
45a Water reservoir (heating surface)
53 Seeds heater (heater for evaporating section)
69 Water supply means 99 Notification means 100 Heating cooker

Claims (1)

A heating cooker that supplies heat to a heating chamber that accommodates an object to be heated to grill-heat the object to be heated,
Heating means for heating the grill;
A steam generator for supplying steam to the heating chamber;
An evaporating section heater for heating the steam generating section;
Water supply means for supplying water to the steam generator;
While controlling the heating of the evaporation section heater, steam supply operation means that is a switch for supplying water to the steam generation section by the water supply means, a control section that is supplied with power from a power supply section connected to a commercial power source, With
When the sum of the amount of power supplied to the heating means and the amount of power supplied to the evaporation unit heater exceeds the rated power of the heating cooker, the control unit has a request for steam supply from the steam supply operation means. While preferentially securing the power supply amount to the evaporation unit heater by limiting the power supply amount to the heating means ,
The steam generation unit is configured to suppress steam having a temperature lower than the surface temperature of the object to be heated during cooking by the heating means for heating the grill in order to suppress a temperature difference between the surface and the inside of the object to be heated. Can be supplied into the heating chamber at any timing,
Furthermore, a heating chamber temperature sensor for detecting the temperature of the heating chamber and a heating object temperature sensor for detecting the temperature of the object to be heated are provided, and the control unit has a temperature detection value by the object temperature sensor to be a predetermined temperature In the above case, increase the amount of power supplied to the evaporator heater,
The said steam supply operation means is a heating cooker which supplies the required quantity of steam according to the cooking content of the said to-be-heated material continuously for one predetermined time by one operation.

Images