JP2021071202A - Heating cooker - Google Patents

Abstract

To provide a heating cooker capable of suppressing temperature change in a cooking chamber at a setting temperature, by suppressing occurrence of voltage flicker and by promptly settling and stabilizing at a set temperature.SOLUTION: A hot air unit of an oven is configured so that a power value of a main heater 27a is greater than a power value of a sub heater 27b. After a temperature T1 in a cooking chamber reaches a first threshold value Th1 which is a set temperature or less, if the temperature in the cooking chamber is within a second threshold value Th2 which exceeds a predetermined temperature from the set temperature, a heat cooking controller 67 sends a control signal to hot air heater driving means 62a so as to perform PWM control for the sub heater 27b while keeping energization of the main heater 27a, and if the temperature in the cooking chamber exceeds the second threshold value Th2, the heat cooking controller 67 sends the control signal to the hot air heater driving means 62a so as to de-energize both of the main heater 27a and the sub heater.SELECTED DRAWING: Figure 8

Description

The present invention relates to a heating cooker provided with a hot air unit that supplies hot air to a cooking chamber to heat and cook an object to be cooked.

As this type of cooking cooker, for example, Patent Document 1 describes a cooking room for accommodating an object to be cooked, a hot air unit for heating the object to be cooked with hot air convection, and a thermista for detecting the temperature in the cooking chamber. The hot air unit provides a hot air heater that heats air, a hot air heater driving means that cuts off the hot air heater, a hot air fan that sends heated air into the cooking chamber and circulates the hot air fan, and the hot air fan in a predetermined direction. A microwave oven equipped with a hot air motor that rotates in a cooking oven is disclosed.

JP-A-2017-194174

In a conventional cooking device such as the microwave oven of Patent Document 1, the temperature inside the cooking chamber in a saturated state at a set temperature in the cooking chamber is uneven and the temperature changes greatly, so that a dish to be cooked such as bread is browned. When it was applied, it was a factor that caused the brown color of the food to be cooked to vary.

Figure 14 is a timing chart showing the transition of the cooking chamber internal temperature at the time of an oven heated by conventional heating cooker, in the conventional heating cooker, the temperature T _p of the cooking chamber is at a set temperature When the thermistor is detected when there at 200 ° C., a hot air heater driving means so that the deenergized the entire hot air heater, thermistor temperature T _p is below 200 ° C. of the cooking chamber is detected, the hot air heater driving means across hot air heater energization Due to the temperature control (see FIG. 9), T _p overshooted up to about 230 ° C., and the amount of overshoot from the set temperature was large. Therefore, it took about 15 minutes to stabilize the convergence at 200 ° C and bring it to a saturated state, and the temperature change Diff in the saturated state at 200 ° C became as large as 23 ° C to 25 ° C. In addition, since the entire hot air heater is disconnected, voltage flicker may occur due to the application and interruption of the input voltage applied to the hot air heater if the power is cut off frequently. Accurate hot air heater control was not possible.

In addition, the food to be cooked is originally cooked in a stone oven, and the flame from the firewood used as fuel inside the stone oven, that is, the firewood flame gently shakes to bake the food to be cooked, so that the food to be cooked is deliciously baked. Is said to be possible. Therefore, the stone oven is characterized by a large heat capacity with little temperature change, and there is a problem that it is overheated in a place near the flame and insufficiently heated in a place far from the flame. However, the firewood flame in the stone oven fluctuates irregularly, and it is possible to add an appropriate accent to the heating of the object to be cooked. A fresh feeling can be added to the texture. On the other hand, the conventional heating cooker has less temperature unevenness than the stone oven, but has a problem that the temperature change is large as described above, and it is difficult to change the heating irregularly. It was not possible to add a moderate accent to the heating.

Therefore, in view of the above circumstances, the present invention can suppress the occurrence of voltage flicker, quickly converge and stabilize at a set temperature to saturate the state, and suppress the temperature change in the saturated state at the set temperature in the cooking chamber. The primary purpose is to provide a cooker.

A second object of the present invention is to provide a heating cooker capable of adding an appropriate accent to the heating of the object to be cooked.

The present invention comprises a cooking room for accommodating an object to be cooked, an oven heating means for heating the object to be cooked by hot air convection, a means for detecting a temperature inside the cooking chamber to detect the temperature in the cooking chamber, and the object to be cooked. The oven heating means includes a cooking control unit that controls the oven heating means so as to cook at a set temperature, and the oven heating means includes a main heater, a sub heater, and a hot air heater driving means, and the main heater. The value of the electric power is configured to be larger than the value of the electric power of the sub-heater, and after the temperature in the cooking chamber reaches the first threshold value equal to or lower than the set temperature, the set temperature is exceeded by a predetermined temperature. When it is equal to or less than the threshold value of 2, the cooking control unit sends a control signal to the hot air heater driving means so as to PWM control the sub heater while maintaining the energization of the main heater, and sends a control signal to the cooking chamber. When the temperature of the above exceeds the second threshold value, the cooking control unit sends a control signal to the hot air heater driving means so as to cut off both the main heater and the sub heater. To do.

According to the invention of claim 1, since the PWM-controlled hot air heater is only a sub-heater having a low electric power value, it is possible to suppress the occurrence of voltage flicker due to the application and interruption of the input voltage applied to the hot air heater. .. Further, since the amount of the temperature in the cooking chamber overshooting from the set temperature can be suppressed, the temperature in the cooking chamber can be quickly converged and stabilized at the set temperature to be saturated. Then, it is possible to suppress the temperature change in the saturated state at the set temperature in the cooking chamber.

According to the invention of claim 2, the heating of the PWM-controlled sub-heater changes irregularly like "1 / f fluctuation", and the fluctuation of the wood flame is reproduced by intentionally not keeping the temperature inside the refrigerator constant. Since an appropriate accent can be added to the heating of the object to be cooked, the finished product can be appropriately changed each time the dish is cooked to add a fresh feeling to the taste and texture.

According to the invention of claim 3, since the mist is instantly vaporized into superheated steam and the object to be cooked in the cooking chamber is heated with an appropriate amount of water molecules (superheated steam), the temperature inside the cooking chamber fluctuates irregularly. Therefore, the amount of the temperature change is suppressed and made uniform, and the surface can be baked crispy while adding an appropriate accent to the heating of the object to be cooked.

According to the invention of claim 4, the rotation speed of the phase-controlled hot air fan fluctuates irregularly like "1 / f fluctuation", and the fluctuation of the wood flame is reproduced by intentionally not keeping the temperature inside the refrigerator constant. Since it is possible to add an appropriate accent to the heating of the object to be cooked, the finished product to be cooked can be appropriately changed each time the dish is cooked to add a fresh feeling to the taste and texture.

It is external perspective view of the cooking apparatus which shows 1st Embodiment of this invention. Same as above, it is a view seen from the front front when the door is opened. The same is the vertical sectional view seen from the side surface. Same as above, it is a view seen from the front front with the cabinet and the rear plate of the oven removed. Same as above, it is a vertical cross-sectional view of a main part of a microwave generator and its surroundings as seen from the side surface. The same is a schematic view showing the internal structure of the main body. Same as above, it is a block diagram which shows the main electrical composition. The same is the circuit diagram of the main part related to the operation of the hot air heater. It is a timing chart showing the transition between the temperature inside the cooking chamber when heating in the oven and the voltage input to the hot air heater in the conventional cooking device and the heating cooker according to the first embodiment of the present invention. It is a circuit diagram of the main part related to the operation of the hot air heater of the heating cooker which shows the 2nd Embodiment of this invention. It is a timing chart showing the transition between the temperature inside the cooking chamber when heating in the oven and the voltage input to the hot air heater in the conventional cooking device and the cooking device of the second embodiment of the present invention. It is a circuit diagram of the main part related to the operation of the hot air fan of the heating cooker which shows the 3rd Embodiment of this invention. The transition between the temperature inside the cooking chamber when heating in the oven, the number of rotations of the hot air fan, and the voltage input to the hot air heater in the conventional heating cooker and the heating cooker according to the third embodiment of the present invention. This is the timing chart that appears. It shows the transition between the temperature inside the cooking chamber and the voltage input to the hot air heater when steam heating using mist superheated steam in the conventional cooking cooker and the heating cooker according to the fourth embodiment of the present invention. It is a timing chart. It is a timing chart showing the transition of the temperature inside the cooking chamber when heating in an oven with a conventional heating cooker.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

First, the overall configuration of the first embodiment of the microwave oven as a cooking cooker of the present invention will be described with reference to FIGS. 1 to 7. Reference numeral 1 denotes a main body having a substantially rectangular box shape, and the main body 1 has a substantially rectangular box shape. A metal cabinet 2 is provided as a member for covering the outer shell of the microwave oven to be a product. Reference numeral 3 denotes a door that can be opened and closed provided on the front surface of the main body 1.

The upper part of the door 3 is provided with a handle 4 for opening / closing operation, which is used when opening / closing the vertically opening door 3, and the lower part of the door 3 is an operation panel portion 5 for displaying, notifying, and operating. It has. In addition to the display means 6 for displaying the cooking setting contents and the progress status, the operation panel unit 5 is provided with the operation means 7 that enables various operation inputs related to cooking. Although not shown, an operation panel PC (printing circuit) board is arranged inside the door 3 on the rear side of the operation panel unit 5 in order to control the display means 6 and the operation means 7.

A water supply cassette 8 and a water receiver 9 that can be attached to and detached from the front surface of the main body 1 are respectively arranged in the lower part of the main body 1. The water supply cassette 8 is a bottomed container in which water to be liquid is put as a supply source of mist ejected from the mist supply device 43 described later. The water receiver 9 is a bottomed container that receives food waste, water droplets, steam, etc. from the main body 1.

The cabinet 2 forming the left and right side surfaces and the upper surface of the main body 1 covers the oven front plate 12 forming the front surface of the main body 1 and the rear surface of the main body 1 so as to cover the main body 1 and the oven bottom plate 11 forming the bottom surface of the microwave oven. It is provided between the oven rear plate 13 to be formed. Further, the main body 1 is provided with a cooking chamber 14 for accommodating an object S to be cooked and a thermistor 15 which is a temperature detecting element for detecting the temperature of the cooking chamber 14. The front surface of the cooking chamber 14 reaches the front plate 12 of the oven and is opened for taking in and out the object S to be cooked, and this opening is opened and closed by the door 3. Further, the thermistor 15 serving as an internal temperature detecting means is arranged in the vicinity of the door 3 inside the cooking room 14. Further, in the thermistor 15 of the present embodiment, the detection width is limited so that the 1 digit becomes several degrees Celsius, and the resolution is improved and the sensitivity is increased as compared with the thermistor of the conventional microwave oven in which the 1 digit is about 20 ° C. ing.

The peripheral wall forming the inner surface of the cooking chamber 14 is composed of a ceiling wall 14a, a bottom wall 14b, a left side wall 14c, a right side wall 14d, and a back wall 14e. The back wall 14e of the cooking chamber 14 is provided with a suction port 16 in the center thereof, and a plurality of outlets 17 are provided around the suction port 16. Further, an upper heater 18 for a grill that radiates and heats the object S to be cooked from above the cooking room 14 is provided on the upper part of the main body 1 facing the dome-shaped ceiling wall 14a which is the upper wall surface of the cooking room 14. A microwave generator 19 including a magnetron is provided at the bottom of the main body 1 in order to supply microwaves, which are radio waves, into the cooking room 14. As a result, the object S to be cooked stored in the cooking chamber 14 is grill-heated from above by heat radiation accompanying the energization of the upper heater 18, and the inside of the cooking chamber 14 is energized by the microwave generator 19. Microwaves are radiated to the object to be cooked S housed in the above, and the object to be cooked S is heated in a microwave oven. As will be described later, in addition to the thermistor 15, the temperature is near the placement position of the object S to be cooked, for example, in the lower center of the left side wall 14c or the right side wall 14d or near the placement position of the object S to be cooked on the bottom wall 14b. A thermistor as a detection element may be provided so that the temperature information in the vicinity of the object to be cooked S can be fed back more quickly and accurately from the thermistor, as will be described later.

The left side wall 14c and the right side wall 14d of the cooking room 14 are provided with a pair of left and right shelf supports 22 in two upper and lower stages in order to store and hold the metal square plate 21 in a suspended state inside the cooking room 14. There is. The square plate 21 used here is formed by a bottomed concave shape having an open upper surface and a non-perforated housing portion 21A, and a flange portion 21B extending in the horizontal direction outside the upper end of the housing portion 21A. It is composed. Further, a vent hole 21C is formed in the flange portion 21B to allow hot air to flow through the square plate 21. FIG. 2 shows a state in which the flange portion 21B of the square plate 21 is placed on the lower shelf support 22 inside the cooking chamber 14 and the object to be cooked S is placed on the accommodating portion 21A. The plate 21 may be placed only on the upper shelf support 22, or two square plates 21 may be placed on the upper and lower shelf supports 22, respectively. Instead of the square plate 21, a grill net (not shown) Other accessories such as may be accommodated and retained. Further, in the microwave oven heating by the microwave generator 19 described above, a container capable of microwave oven heating the object S to be cooked inside the cooking chamber 14 without putting a square plate 21 or a grill inside the cooking chamber 14 (FIG. FIG. Can be cooked in a microwave oven (not shown).

Reference numeral 24 denotes a hot air unit for heating the oven, which is provided inside the main body 1 from the rear outside to the bottom of the cooking room 14. As a means for heating the object S to be cooked, the hot air unit 24 sends a convex casing 26 attached to the back wall 14e, a hot air heater 27 for heating air, and heated air into the cooking chamber 14 to circulate the heated air. It is generally composed of a hot air fan 28, an electric hot air motor 29 that rotates the hot air fan 28 in a predetermined direction, and a transmission mechanism 30 that transmits the driving force from the hot air motor 29 to the hot air fan 28. As an internal space between the back wall 14e and the casing 26, a hot air heater 27 and a hot air fan 28 are respectively arranged in the heating chamber 31 formed behind the outside of the cooking chamber 14, while the inside of the main body 1 is provided. A hot air motor 29 is arranged in the lower space 32 between the cooking chamber 14 and the oven bottom plate 11 formed in the oven. Then, the oven rear plate 13 is arranged at the rear part of the main body 1 so as to cover the entire hot air unit 24 from the rear side outside.

The hot air fan 28 of the present embodiment is provided as a so-called centrifugal fan that discharges air taken in in the axial direction in a radial direction perpendicular to the axial direction by centrifugal force during rotation, and the tubular hot air heater 27 is a hot air fan. It is arranged so as to surround the radial direction of 28. As the hot air heater 27, which is also a heat generating portion, for example, a sheathed heater, a mica heater, a quartz tube heater, a halogen heater, or the like is used. The suction port 16 and the hot air outlet 17 described above function as a ventilation unit that communicates between the cooking chamber 14 and the heating chamber 31.

Then, in the present embodiment, when the hot air fan 28 is rotationally driven with the energization of the hot air motor 29, the air sucked from the inside of the cooking chamber 14 through the suction port 16 is blown out in the radiation direction of the hot air fan 28 and energized. It is heated by the hot air heater 27, and the hot air passes through the outlet 17 and is supplied into the cooking chamber 14. As a result, a path for circulating hot air inside and outside the cooking chamber 14 is formed, and the object S to be cooked in the cooking chamber 14 is heated by hot air convection.

Subsequently, as a heating means for heating the object S to be cooked, a microwave generator 19 as a microwave heating means and a detailed structure around the microwave generator 19 will be described. The bottom wall 14b of the cooking chamber 14 is configured by covering the upper surface opening of the concave antenna storage portion 35 formed in the metal plate material 34 with a bottom plate 36 such as a ceramic plate that can transmit microwaves. The metal plate material 34, which cannot transmit microwaves, integrally forms not only the peripheral portion of the bottom wall 14b but also the left side wall 14c, the right side wall 14d, and the back wall 14e. The inner surface of the surface is made of a material that does not allow microwaves to pass through.

The microwave generator 19 guides the microwave oscillated by the magnetron directly under the antenna housing portion 35 in the lower space 32 inside the main body 1 in addition to the magnetron (not shown) which is the source of the microwave. The wave tube 37, the antenna motor 38 arranged below the waveguide 37, and the antenna holder 39 whose lower end is arranged inside the waveguide 37 and attached and fixed to the rotating shaft of the antenna motor 38. A cylindrical cable shaft 40 that is inserted and fixed in the antenna holder 39, and an antenna 41 that is rotatably provided inside the antenna storage portion 35 with the upper end portion of the cable shaft 40 attached and fixed at the center thereof. Mainly composed. In a state where the upper surface opening of the antenna storage portion 35 is closed by the bottom plate 36, the entire antenna 41 is arranged parallel to the bottom plate 36 so as to face the flat plate-shaped bottom plate 36 forming the bottom wall 14b of the cooking chamber 14.

In addition to the water supply cassette 8 described above, the mist supply device 43 that sends mist into the kitchen 14 is connected between the nozzle 45 that makes the water to be supplied into a mist shape and the water supply cassette 8 and the nozzle 45. A water supply pipe 46 is provided, a water supply pump 47 that guides water from the water supply cassette 8 to the nozzle 45, and a plurality of mist ejection holes 44 that communicate with the nozzle 45. As a result, during the operation of the mist supply device 43, the water from the water supply cassette 8 is sent to the nozzle 45 by the water supply pump 47, and the water supplied by the nozzle 45 is turned into mist, and the water supplied by the nozzle 45 is turned into mist, and the water supplied from the nozzle 45 is turned into mist, and the water supplied from the mist ejection hole 44 is used in the cooking room 14. Supplied inside. At this time, if the temperature in the cooking room 14 is higher than 100 ° C. (hereinafter, the temperature value is the value of the temperature in the cooking room 14 at atmospheric pressure), this mist is instantly generated in the cooking room 14. By vaporizing to become superheated steam, the object to be cooked S placed in the cooking chamber 14 is quickly and evenly heated with appropriate water molecules (superheated steam).

FIG. 7 illustrates the main electrical configuration of the microwave oven. In the figure, 51 is a control means composed of a microcomputer, and as is well known, the control means 51 includes a CPU as an arithmetic processing means, a memory as a storage means, a timer as a timekeeping means, and an input. It is equipped with an output device.

The input port of the control means 51 is configured by equipping the infrared sensor 53A, which is a detection element, with a swing mechanism in addition to the operation means 7 using the keys and the touch panel described above, and detects the temperature distribution in the entire kitchen 14. As a result, the temperature of the object to be cooked 53, which enables the surface temperature of the object to be cooked S housed therein to be detected by the infrared sensor 53A, and the temperature inside the chamber 14 such as the thermistor 15 for detecting the temperature inside the cooking chamber 14 are detected. The means 54, the hot air motor rotation detecting means 55 for detecting the rotation of the hot air motor 29, the door opening / closing detecting means 56 for detecting the open / closed state of the door 3, and the origin position of the antenna constituting the microwave generator 19 are detected. The antenna position detecting means 57 are electrically connected to each other.

In addition to the display means 6 described above, the output port of the control means 51 includes a microwave heating means 61 including a magnetron of the microwave generator 19 and a driving means thereof, an upper heater 18 for heating the grill, and an oven heating. A heater driving means 62 such as a relay for passing and disconnecting the hot air heater 27, an antenna driving means 63 for rotationally driving an antenna that radiates microwaves in the cooking room 14, and a hot air motor 29 for rotationally driving the hot air motor 29. The hot air motor driving means 64 and the pump driving means 65 for operating the water supply pump 47 of the mist supply device 43 are electrically connected to each other.

The control means 51 includes an operation signal from the operation means 7, a food temperature detecting means 53, an internal temperature detecting means 54, a hot air motor rotation detecting means 55, a door opening / closing detecting means 56, and an antenna position detecting means. Upon receiving each detection signal from 57, the microwave heating means 61, the heater driving means 62, the antenna driving means 63, the hot air motor driving means 64, and the pump drive are performed at a predetermined timing based on the time counting from the time measuring means. The means 65 has a function of outputting a control signal for driving, and the display means 6 has a function of outputting a control signal for display. Such a function is realized by reading a program recorded in the memory as a storage medium by the control means 51. In particular, in the present embodiment, the control means 51 is used as a cooking control unit 67 and a display notification control unit 68. It has a program to make it work.

The cooking control unit 67 mainly controls the operation of each part related to cooking of the object S to be cooked, and when it receives an operation signal accompanying the operation of the operation means 7, it receives a detection signal from the door open / close detection means 56. When it is determined that the door 3 is closed, the microwave heating means 61, the heater driving means 62, the antenna driving means 63, the hot air motor driving means 64, and the pump driving means 65 depend on the operation signal. A control signal is sent to control the cooking of the object S to be cooked in the cooking chamber 14. Further, a plurality of cooking menus are stored in the memory in advance as cooking information including the ingredients of the object S to be cooked and the heating conditions for executing various cooking, and the cooking control unit 67 is an operating means. When the menu selection setting means 7A incorporated in 7 is appropriately operated, one or a plurality of cooking menus selected from the cooking menus are set as specific cooking menus to be cooked from now on, and a predetermined cooking menu is followed. The structure is such that the object to be cooked S is automatically cooked according to the procedure.

Specifically, the menu selection setting means 7A is provided on the surface of the LED display which is the display means 6, and is a touch key which enables a specific menu to be selected from a plurality of menus displayed on the LED display. When a specific menu is selected and pressed by the operation of the touch key, the specific menu is set and memorized by the cooking control unit 67, and the object to be cooked S is in a predetermined procedure according to the specific menu. It consists of a start key to start cooking. It should be noted that this is just an example, and the configuration of the menu selection setting means 7A is not particularly limited.

Next, the operation of the microwave oven having the above configuration will be described in detail. With the object S to be cooked in the cooking room 14 in advance, the door 3 is closed while holding the handle 4 by hand, and a specific cooking menu is selected and operated by the menu selection setting means 7A or the like, and then the item S to be cooked When the start of cooking is instructed, the control signal generated corresponding to the selected cooking menu is output from the output port of the control means 51 at a predetermined timing according to the control program embedded in the memory of the control means 51, and the cooked menu is received. The cooked food S is cooked.

Here, for example, when the menu of microwave oven cooking is selected, the cooking control unit 67 receives the detection signal from the cooking object temperature detecting means 53, and the antenna is heated so that the cooking object S is heated to the set temperature. While confirming the origin position of the antenna 41 by the detection signal from the position detecting means 57, an appropriate control signal is sent to the microwave heating means 61 and the antenna driving means 63, respectively. As a result, the magnetron and the antenna 41 of the microwave generator 19 operate, the microwave generated from the surface of the rotating antenna 41 is supplied into the cooking chamber 14, and the object S in the cooking chamber 14 is heated at high frequency. Will be done.

When the grill cooking menu is selected, the cooking control unit 67 receives a detection signal from the internal temperature detecting means 54 and uses the heater driving means 62 to heat the inside of the cooking chamber 14 to a set temperature. The power transmission / disconnection of the upper heater 18 is controlled, and the object S to be cooked in the cooking chamber 14 is grill-heated from above.

When the menu of steamed cooking (steam cooking) using mist superheated steam is selected, the heating cooking control unit 67 receives a detection signal from the internal temperature detecting means 54 and heats the inside of the cooking chamber 14 to a set temperature. The heater driving means 62 controls the power transmission / disconnection of the upper heater 18. Then, when the cooking control unit 67 determines that the temperature inside the cooking chamber 14 has reached the set temperature, a control signal is sent to the pump driving means 65, and the operation of the water supply pump 47 incorporated in the mist supply device 43 is performed. Is controlled to eject water from the mist ejection hole 44 into the cooking chamber 14 to supply the mist. At this time, the heating / cooking control unit 67 controls the operation of the water supply pump 47 so that water equal to or less than the upper limit of the amount that can be vaporized at the set temperature is ejected in the cooking chamber 14 at one time. As a result, since the inside of the cooking chamber 14 is heated to the set temperature, the mist is instantly vaporized into superheated steam, and the mist that is not vaporized at this time also comes into contact with any of the walls 14a to 14e of the cooking chamber 14. As a result, it evaporates and vaporizes into superheated steam, and the object S to be cooked in the cooking chamber 14 is quickly and evenly heated by appropriate water molecules (superheated steam). Therefore, the wateriness of the object S to be cooked can be reduced and the dish S can be baked deliciously. Further, since the amount of water W used can be halved, the amount of drain can be reduced and almost eliminated, and the water receiver 9 and the cooking room 14 can be easily maintained.

When the mist is supplied to the inside of the cooking chamber 14, the temperature inside the cooking chamber 14 decreases. When the cooking control unit 67 determines whether or not the temperature inside the cooking chamber 14 has reached the set temperature based on the detection signal from the temperature detecting means 54 inside the cooking chamber 14, and when the cooking control unit 67 determines that the temperature has not reached the set temperature. The heating / cooking control unit 67 controls the power transmission / disconnection of the upper heater 18 by the heater driving means 62 so that the inside of the cooking chamber 14 is heated to a set temperature. When the cooking control unit 67 determines that the temperature inside the cooking chamber 14 has reached the set temperature, water is ejected into the cooking chamber 14 to supply the mist again as described above. As a result, the mist is instantly vaporized into superheated steam, and the object S to be cooked in the cooking chamber 14 is heated with an appropriate amount of water molecules (superheated steam), so that it has a function of reducing salt and deoiling oil during heating. Can be done. Further, by baking the cooked food S in a charred state, the original taste of the cooked food S can be brought out.

Here, the operation when the oven heating menu is selected will be described with reference to FIGS. 8 and 9. FIG. 8 shows a circuit configuration of a main part particularly related to the operation of the hot air heater 27. In the figure, 71 is a cord with a power plug, 72 is a power supply circuit that generates and outputs an AC voltage from a commercial voltage supplied from the cord 71 with a power plug, and the AC voltage from the power supply circuit 72 is the next stage. It is applied to the hot air heater 27 as an input voltage. The hot air heater 27 of the present embodiment includes a main heater 27a and a sub heater 27b, and the value of the electric power of the main heater 27a is larger than the value of the electric power of the sub heater 27b, and only the sub heater 27b is PWM-controlled. , The generation of voltage flicker due to the application and interruption of the input voltage applied to the hot air heater 27 is suppressed. In the present embodiment, the main heater 27a is 1200 W and the sub heater 27b is 200 W, but the value is not limited to this. One end of the main heater 27a and one end of the sub heater 27b are connected in parallel with one side of the power supply circuit 72. The other end of the main heater 27a and the other end of the sub heater 27b are connected to the hot air heater driving means 62a of the heater driving means 62, and the hot air heater driving means 62a is connected to the other side of the power supply circuit 72.

The hot air heater driving means 62a is an IGBT element for passing a current through a first switch element 73 made of a relay, a second switch element 74 made of a triac, and an LED element on the light emitting side of the second switch element 74. The hot air heater driving means 62a is composed of 75 and a resistor 76, and the PWM control circuit 67a of the cooking control unit 67 is connected to the hot air heater driving means 62a. Specifically, one end of the first switch element 74 is connected in series with the main heater 27a, and the other end is connected to the other side of the power supply circuit 72. The input voltage is applied to and cut off from the main heater 27a.

In the second switch element 74, one end of the phototriac element on the light receiving side is connected in series with the subheater 27b, and the other end of the phototriac element is parallel to the first switch element 74 on the other side of the power supply circuit 72. Is connected with. Then, the cathode of the LED element on the light emitting side of the second switch element 74 is connected to one end of the resistor 76, the anode of this LED element is connected to the emitter of the IGBT element 75, and a current flows through the LED element to turn it on. Then, the phototriac element is turned on, the second switch element 74 is turned on, and the input voltage is applied to the subheater 27b.

In the IGBT element 75, the collector terminal is connected to the Vcc voltage terminal Vcc, and the gate terminal is connected to the PWM control circuit 67a. Then, the other end of the resistor 76 is connected to the ground terminal G, and when a signal from the PWM control circuit 67A is input to the gate terminal of the IGBT element 75, a current from the terminal Vcc flows between the collector and the emitter, and this current flows. Passes through the phototriac element on the light receiving side of the second switch element 74, and flows to the ground terminal G via the resistor 76.

The PWM control means 67a receives the detection signal from the internal temperature detecting means 54 and outputs a PWM control signal to the IGBT element 75 so that the internal temperature is maintained at the set temperature, and the hot air heater driving means. The sub-heater 27b is PWM-controlled by 62a. Further, the PWM control means 67a of the present embodiment is PWM-controlled with an energization rate of 50% to 100%, and the energization rate is changed according to the object to be cooked S. For example, when the object to be cooked S is bread, the energization rate is 60%, but the present invention is not limited to this value. The cooking control unit 67 controls so that both the first switch element 73 and the second switch element 74 are turned off when the temperature inside the refrigerator exceeds the set temperature by a predetermined temperature. On the other hand, when the temperature inside the refrigerator is within a predetermined temperature from the set temperature, the PWM control means 67a keeps the first switch element 73 ON and applies the input voltage to the main heater 27a. The sub-heater 27b is configured to be PWM-controlled, suppresses the occurrence of voltage flicker due to the application and interruption of the input voltage, and reduces the change in the temperature inside the kitchen 14.

The operation when the oven heating menu is selected will be described with reference to FIG. In FIG. 9, T ₁ is a graph of the temperature inside the microwave oven of the present embodiment, and T _p is a graph of the temperature inside the conventional microwave oven whose temperature is controlled by the entire hot air heater 27. First, the cooking control unit 67 receives the detection signal from the internal temperature detecting means 54, and the heater driving means 62 and the hot air motor driving means 64 are heated so that the inside of the cooking chamber 14 is heated to the set temperature of 200 ° C. It sends each control signal, for controlling the hot air heater 27 or the main heater 27a and the sub heater 27b, the hot air motor 29, a through-energized (step _S 1) to. As a result, the rotational force generated in the hot air motor 29 is transmitted to the hot air fan 28, the hot air fan 28 rotates inside the heating chamber 31, and the rotation speed is increased to the heating cooking control unit 67 by the hot air motor rotation detecting means 55. It is captured. Further, by the rotation of the hot air fan 28, the air sucked into the heating chamber 31 from the cooking chamber 14 through the suction port 16 is sent to the hot air heater 27 side, and the heated air is sent to the cooking chamber 14 as hot air through the outlet 17. By supplying, the object S to be cooked in the cooking chamber 14 is heated by hot air convection.

In the microwave oven of the present embodiment, when the cooking control unit 67 receives the detection signal from the internal temperature detecting means 54 _{and determines that the internal temperature T 1 has reached the first} threshold value Th 1, the first one is determined. while maintaining the switching element 73 to oN, the sub-heater 27b to PWM control by the PWM control unit 67a, and sends a control signal to the hot air heater drive unit 62a of the heater driving means 62 (step _S 2). The first value of threshold Th _1, considering the internal rate of increase in the temperature T ₁ of the at Step S _1, is preferably set to the following values 200 ° C. is a temperature set. Thus, while the input voltage applied to the main heater 27a, the sub-heater 27b is PWM controlled, thereby reducing the change in the internal temperature T ₁ of the cooking chamber 14. The thermistor 15 as the inside temperature detection unit 54 of the present embodiment, since the better resolution, more and the internal temperature T ₁ of can be precisely detected, it is PWM controlled more reliably sub heater 27b .. At this time, the thermistor as the internal temperature detecting means 54 is located near the mounting position of the cooked object S, for example, in the lower center of the left side wall 14c or the right side wall 14d or in the vicinity of the mounted position of the cooked object S on the bottom wall 14b. When is provided, the temperature information in the vicinity of the object to be cooked S can be fed back from the thermistor to the cooking control unit 67 more quickly and accurately, so that the sub-heater 27b can be PWM-controlled more quickly and accurately.

In response to the detection signal from the internal temperature detecting means 54, the cooking control unit 67 has reached a _{second threshold value Th 2 in which the internal temperature T 1} exceeds the set temperature of 200 ° C. by a predetermined temperature. If it is determined that, it sends a control signal to the first switching element 73 and second switching element 74 to the hot air heater drive unit 62a so as both to OFF (step S _3). Thereby, the main heater 27a and the sub heater 27b are both are deenergized, the inside temperature T ₁ is reduced.

After that, when the heating cooking control unit 67 receives the detection signal from the internal temperature detecting means 54 _{and determines that the internal temperature T 1} has fallen below 200 ° C., the first switch element 73 is kept ON again. in the sub-heater 27b to PWM control by the PWM control unit 67a, and sends a control signal to the hot air heater drive unit 62a of the heater driving means 62 (step _S 4). As a result, the amount of the internal temperature overshooting from the set temperature can be suppressed, so that the temperature can be quickly converged and stabilized at the set temperature to achieve the saturated state, and the temperature change in the saturated state at the set temperature can be changed. It can be suppressed. Then, when the cooking control unit 67 receives the detection signal from the internal temperature detecting means 54 _{and determines that the internal temperature T 1 has reached the second} threshold value Th 2 again, the first switch element 73 again. and second switching element 74 either sends a control signal to the hot air heater drive unit 62a so as to OFF (step S _5). Then, exit timer time measurement as clock means of the control means 51 to the oven heating is completed, cooking controller 67 repeats the operations in steps S ₄ to S ₅ mentioned above.

9, in this embodiment the internal temperature T ₁ of the microwave oven, when comparing the internal temperature T _p of a conventional microwave oven for temperature control by the overall hot air heater 27, from 200 ° C. is a temperature set The maximum value of the amount of overshoot is such that the internal temperature T _p of the conventional microwave oven is approximately 30 ° C, whereas the internal temperature T _{1 of the} microwave oven of the present embodiment is approximately 5 ° C. It was confirmed that it was suppressed. Time to converge stably be brought to saturation in this order 200 ° C. is that the internal temperature T _p of the conventional microwave oven is 15 minutes approximately, the internal temperature T ₁ of the microwave oven of this embodiment It took about 5 minutes, and it was confirmed that the temperature was quickly converged and stabilized at the set temperature to achieve saturation. Further, in the temperature change Diff in the saturated state at 200 ° C., the _{internal temperature T 1 of the} microwave oven of the present embodiment is 8 ° C. _{, whereas the internal temperature T p of the conventional microwave oven is 23 to 25 ° C.} It was also confirmed that the temperature change in the saturated state at the set temperature was suppressed, and the superiority of the microwave oven of the present embodiment was confirmed.

As described above, the oven range of the present embodiment includes the cooking chamber 14 that houses the object S to be cooked, the hot air unit 24 as the oven heating means for heating the object S to be cooked by hot air convection, and the inside of the cooking chamber 14. Cooking control unit 67 that controls the internal temperature detecting means 54 for detecting the temperature T ₁ of the hot air unit 24, the heater driving means 62 of the hot air unit 24 and the hot air motor driving means 64 so as to cook the object S to be cooked at a set temperature. The hot air unit 24 includes a main heater 27a and a sub heater 27b for heating air, and a hot air heater driving means 62a for cutting off the main heater 27a and the sub heater 27b. The value is configured to be larger than the value of the electric power of the sub-heater 27b, and after the temperature T _{1 in the cooking chamber 14 reaches the first} threshold value Th 1 of 200 ° C. or lower, which is the set temperature, the value is determined from 200 ° C. When the temperature exceeds the second threshold value Th _{2 or} less, the cooking control unit 67 controls the hot air heater driving means 62a so as to PWM control the sub heater 27b while maintaining the energization of the main heater 27a. When a signal is sent and the temperature in the cooking chamber 14 _{exceeds the second threshold value Th 2} , the cooking control unit 67 hot air heater driving means 62a so as to cut off both the main heater 62a and the sub heater 62b. It is configured to send a control signal to.

In this case, since the hot air heater 27 that is PWM-controlled is only the sub-heater 27b having a low electric power value, it is possible to suppress the occurrence of voltage flicker due to the application and interruption of the input voltage applied to the hot air heater 27. _{Further, since the amount of the temperature T 1} in the cooking chamber 14 overshooting from 200 ° C. can be suppressed, it is possible to quickly converge and stabilize at the set temperature to achieve the saturated state. _{Then, at the temperature T 1} in the cooking chamber 14, the temperature change Diff in the saturated state at 200 ° C. can be suppressed.

Further, the thermistor, which is the temperature detecting means 54 in the refrigerator of the present embodiment, may be provided in the vicinity of the placement position of the object to be cooked S, and the temperature information in the vicinity of the object to be cooked S may be heated more quickly and accurately from the thermistor. Since the feedback can be fed back to the cooking control unit 67, the sub-heater 27b can be PWM-controlled more quickly and accurately.

Hereinafter, a second embodiment of the microwave oven as a cooking device in the present invention will be described with reference to FIGS. 10 and 11. In the present embodiment, in addition to the configuration of the microwave oven of the first embodiment, the fluctuation data storage unit 81 that stores the fluctuation data of the firewood flame is provided.

FIG. 10 shows the circuit configuration of the main part related to the operation of the hot air heater 27 in the present embodiment, and the point that the fluctuation data storage unit 81 is incorporated in the PWM control means 67a is shown in FIG. It is different from the circuit configuration of the first embodiment described. Other configurations are the same as in the first embodiment.

The fluctuation data storage unit 81 stores "fluctuation data" corresponding to the fluctuation of the firewood flame. This "fluctuation data" is a data of "1 / f fluctuation" whose signal strength changes irregularly with time. It is said that there are sound fluctuations that people feel comfortable with in the natural world, and there are many fluctuations such as heartbeats, river babbling, flame swaying, ripples, and rain sounds. All of these seem to be constant, and there are unpredictable irregular fluctuations in them, which is known as "1 / f fluctuation". The flame of the firewood used in the stone oven also sways irregularly like "1 / f fluctuation" to heat the food to be cooked and heal the human heart. Using the fluctuation data to realize the behavior, a predetermined heating pattern in which the output of the sub-heater 27b changes continuously and fluctuates irregularly is set by the PWM control circuit 67a, and according to the set predetermined heating pattern. , The PWM control circuit 67a controls the sub-heater 27b. Therefore, the fluctuation data stored in the fluctuation data storage unit 81 is read into the PWM control circuit 67a and reflected in the PMW control of the sub-heater 27b.

It should be noted that the signal strength of the data randomly waveformd in the true sense may not change irregularly, and may not fluctuate irregularly such as "1 / f fluctuation". Therefore, the fluctuation data of the present embodiment is pre-programmed with data in which the energization rate, period, etc. are irregularly fluctuated such as "1 / f fluctuation", and the programmed fluctuation data is stored in the fluctuation data storage unit 81. It is remembered.

The operation when the oven heating menu is selected in the present embodiment will be described with reference to FIG. In FIG. 11, T ₂ is a graph of the temperature inside the microwave oven of the present embodiment, and T _p is a graph of the temperature inside the conventional microwave oven whose temperature is controlled by the entire hot air heater 27. Since the action of converging and stabilizing at 200 ° C., which is the set temperature of the oven range of the present embodiment, is the same as that of the first embodiment, the description thereof will be omitted.

Upon receiving the detection signal from the internal temperature detecting means 54, the heating cooking control unit 67 said that _{the temperature change Diff of the internal temperature T 2} became 8 ° C. or less, which is a predetermined value, and became saturated at 200 ° C. Judging (where P _1), the fluctuation data stored in the fluctuation data storage unit 81 sends a control signal to deliver to the PWM control circuit 67a. The PWM control circuit 67a that has received the fluctuation data reads the fluctuation data and irregularly changes the energization rate of the PWM control of the sub heater 27b from 50% to 100% so that the hot air heater driving means 62a of the heater driving means 62 Sends a control signal to. As a result, the heating of the PWM-controlled sub-heater 27b changes irregularly like "1 / f fluctuation", and the fluctuation of the wood flame is reproduced by intentionally not keeping the _{temperature T 2 in the refrigerator constant, and the food to be cooked.} Since an appropriate accent can be added to the heating of S, the finished product S can be appropriately changed each time cooking is performed, and a fresh feeling can be added to the taste and texture.

Cooking control unit 67 determines that the oven heating has reached the time t ₁ of the finishing in response to a signal from the timer as time measuring means (location P _2), the fluctuation data storage to stop the transmission of fluctuation data A control signal is sent to unit 81. As a result, the PWM control circuit 67a sends a control signal to the hot air heater driving means 62a so as to perform the PWM control as described in the first embodiment, and the internal temperature T ₂ overshoots from 200 ° C. Is suppressed, and the temperature change in the saturated state at 200 ° C. is suppressed. Therefore, it is possible to stably reduce the temperature change Diff of the internal temperature T ₂ and eliminate the unevenness of the brown color with respect to the object S to be cooked.

As described above, the microwave oven of the present embodiment includes a fluctuation data storage unit 81 as a first storage means for storing fluctuation data in which "1 / f fluctuation" is converted into data by the heating / cooking control unit 67, and heat cooking is performed. The PWM control circuit 67a of the control unit 67 reads the fluctuation data from the fluctuation data storage unit 81 and sends a control signal to the hot air heater driving means 62a so as to irregularly change the energization rate of the PWM control of the sub heater 27b. It is supposed to be.

In this case, the heating of the PWM-controlled sub-heater 27b fluctuates irregularly like "1 / f fluctuation", and the fluctuation of the wood flame is reproduced by intentionally not keeping the _{temperature T 2 in the refrigerator constant, and the food is cooked.} Since an appropriate accent can be added to the heating of the object S, the finished product S can be appropriately changed each time it is cooked to add a fresh feeling to the taste and texture.

Further, the microwave oven of the present embodiment is further provided with a timer as a time measuring means, and when the oven heating as heating cooking _{reaches the finishing time t 1} (place P ₂ ), the PWM control circuit 67a is transferred to the fluctuation data storage unit. The control signal is sent to the hot air heater driving means so as to stop reading the fluctuation data from the 81 and control the sub-heater 27b by PWM.

In this case, _{the amount of overshoot of the internal temperature T 2} from the set temperature of 200 ° C. is suppressed, and the temperature change Diff in the saturated state at 200 ° C. is suppressed. Therefore, it is possible to stably reduce the temperature change Diff of the internal temperature T ₂ and eliminate the unevenness of the brown color with respect to the object S to be cooked.

Hereinafter, a third embodiment of the microwave oven as a cooking device in the present invention will be described with reference to FIGS. 12 and 13. In the present embodiment, by irregularly changing the rotation speed of the hot air fan 28, _{the fluctuation of the firewood flame is reproduced by intentionally not keeping the temperature T 3} in the refrigerator constant, which is appropriate for heating the object S to be cooked. I'm adding an accent.

FIG. 12 shows the circuit configuration of the main part related to the operation of the hot air fan 28 in this embodiment. In the figure, one end of the hot air motor 29 is connected in parallel with one side of the power supply circuit 72, and an AC voltage from the power supply circuit 72 is applied to the hot air motor 29 in the next stage as an input voltage. The other end of the hot air motor 29 is connected to the hot air motor driving means 64, and the hot air motor driving means 64 is connected to the other side of the power supply circuit 72.

The hot air motor driving means 64 is composed of a third switch element 84 made of a triac, an IGBT element 85 for passing a current through the LED element on the light emitting side of the third switch element 84, and a resistor 86. The phase control circuit 67b of the cooking control unit 67 is connected to the hot air motor driving means 64. Since the connection between the third switch element 84, the IGBT element 85, and the resistor 86 is the same as that of the hot air heater driving means 62a described above, the description thereof will be omitted.

The phase control circuit 67b receives the detection signal from the hot air motor rotation detecting means 55 and changes the ratio of the ON time in each cycle of the input voltage of the hot air motor 29 so that the hot air fan 28 rotates at a predetermined rotation speed. A control signal is output to the IGBT element 85, and the hot air motor driving means 64 controls the phase of the hot air motor 29. The phase control circuit 67b in the first and second embodiments outputs a phase control signal to the IGBT element 85 so that the hot air fan 28 is maintained at a predetermined rotation speed when the hot air convection heating is performed.

The phase control circuit 67b of the present embodiment incorporates a fluctuation data storage unit 81', and the fluctuation data storage unit 81' stores "fluctuation data" corresponding to the above-mentioned fluctuation of the firewood flame. .. Then, this fluctuation data is read into the phase control circuit 67b and reflected in the phase control of the hot air motor 29.

The operation when the oven heating menu is selected in the present embodiment will be described with reference to FIG. In FIG. 13, T ₃ is a graph of the temperature inside the microwave oven of the present embodiment, and T _p is a graph of the temperature inside the conventional microwave oven whose temperature is controlled by the entire hot air heater 27. Since the action of converging and stabilizing at 200 ° C., which is the set temperature of the oven range of the present embodiment, is the same as that of the first embodiment, the description thereof will be omitted.

Cooking control unit 67 receives the detection signal from the inside temperature detection unit 54, temperature change Diff in internal temperature T ₃ becomes less 8 ° C. is a predetermined value, becomes saturated with 200 ° C. and Judging (where P _3), and sends a control signal to deliver the fluctuation data stored in the fluctuation data storage unit 81 'to the phase control circuit 67b. The phase control circuit 67b that has received the fluctuation data reads the fluctuation data and controls the hot air motor driving means 64 so that the rotation speed of the hot air fan 28 is irregularly changed within a predetermined range, for example, between 500 rpm and 2500 rpm. Send a signal. Also doing so, the rotational speed of the phase-controlled hot air fan 28 is irregularly variable such as "1 / f fluctuation", the fluctuation of firewood flame the internal temperature T ₃ dare by not constant Since it is possible to reproduce and add an appropriate accent to the heating of the object to be cooked S, it is possible to appropriately change the finished product of the object to be cooked S each time it is cooked to add a fresh feeling to the taste and texture. it can.

Cooking control unit 67 determines that the oven heated in response to a signal from the timer as time measuring means of the control means 51 has reached the time t ₂ of the finishing (location P _4), so as to stop the transmission of fluctuation data A control signal is sent to the fluctuation data storage unit 81'. As a result, the phase control circuit 67b sends a control signal to the hot air motor driving means 64 so that the hot air fan 28 is maintained at a predetermined rotation speed, and suppresses the temperature change Diff in the saturated state at 200 ° C. .. Thus as in the second embodiment, and stably reduce the temperature variation Diff in internal temperature T _3, it is possible to eliminate the browning unevenness of for the food S.

As described above, the hot air unit 24 as the oven heating means of the present embodiment includes a hot air fan 28 that sends heated air into the cooking chamber 14 and circulates it, and a hot air motor 29 that rotates the hot air fan 28 in a predetermined direction. , A hot air motor driving means 64 for rotationally driving the hot air motor, and a cooking control unit 67 as a second storage means for storing fluctuation data obtained by converting "1 / f fluctuation" into data. The phase control circuit 67b of the cooking control unit 67 including the storage unit 81'reads the fluctuation data from the fluctuation data storage unit 81' so that the rotation speed of the hot air fan 28 is irregularly changed within a predetermined range. The control signal is sent to the hot air motor driving means 64.

In this case, the rotational speed of the phase-controlled hot air fan 28 is irregularly variable such as "1 / f fluctuation", dare to reproduce fluctuation firewood flame by not constant internal temperature T _3, Since an appropriate accent can be added to the heating of the object S to be cooked, the finished product S can be appropriately changed each time the dish is cooked to add a fresh feeling to the taste and texture.

Further, the microwave oven of the present embodiment further includes a timer as a time measuring means, and when the oven heating as heating cooking _{reaches the finishing time t 2} , the phase control circuit 67b fluctuates from the fluctuation data storage unit 81'. The data reading is stopped, and the control signal is sent to the hot air motor driving means 64 so that the hot air fan 28 is maintained at a predetermined rotation speed.

In this case, _{the amount of overshoot of the internal temperature T 3} from the set temperature of 200 ° C. is suppressed, and the temperature change Diff in the saturated state at 200 ° C. is suppressed. Thus was stably less temperature variation Diff in internal temperature T _3, it is possible to eliminate the browning unevenness of for the food S.

Hereinafter, a fourth embodiment of the microwave oven as a cooking device in the present invention will be described with reference to FIG. In the present embodiment, steam cooking is performed using mist superheated steam in the configuration of the microwave oven of the second embodiment.

In FIG. 14, T ₄ is a graph of the temperature inside the microwave oven of the present embodiment, and T _p is a graph of the temperature inside the conventional microwave oven whose temperature is controlled by the entire hot air heater 27. Since the control of the main heater 27a and the sub heater 27b of the microwave oven of the present embodiment is the same as that of the second embodiment, the description thereof will be omitted.

When the menu of steamed cooking (steam cooking) using mist superheated steam is selected in the present embodiment, the timer as the time measuring means of the control means 51 starts the time counting, and the heating cooking control unit 67 is the heating cooking control unit 67. Upon receiving the detection signal from 54, the main heater 27a and the sub heater 27b are controlled in the same manner as in the second embodiment. The cooking controller 67 has determined to have reached the 200 ° C. the temperature at which the internal temperature T ₄ is set by receiving a detection signal from the inside temperature detection unit 54, sends a control signal to the pump drive means 65 Then, the operation of the water supply pump 47 incorporated in the mist supply device 43 is controlled to eject water from the mist ejection hole 44 into the cooking chamber 14 to supply the mist. As a result, the temperature inside the oven T ₄ fluctuates irregularly, while the amount of the temperature change Diff is suppressed and made uniform more than the amount of the temperature change Diff of the oven heating of the microwave oven of the second embodiment. The surface can be crispy while adding an appropriate accent to the heating of the cooked food S. Further, since the mist is instantly vaporized into superheated steam and the object S to be cooked in the cooking chamber 14 is heated with an appropriate amount of water molecules (superheated steam), it can have a function of reducing salt and deoiling oil during heating. ..

In this case the cooking controller 67, from the jet of water to the inside of the cooking chamber 14, is set the time to eject water again, the time t ₃ the timer time measurement is finished of the control means 51 Until it reaches, the cooking control unit 67 repeats the above-described operation. The cooking control unit 67 may be configured so that the user can set the time until the water is ejected again.

Cooking control unit 67 determines that the menu signal received by steam cooking from the timer as time counting means has reached the time t ₃ of the finishing (location P _5), the fluctuation so as to stop the transmission of fluctuation data A control signal is sent to the data storage unit 81, and the PWM control circuit 67a sends a control signal to the hot air heater driving means 62a so as to perform PWM control as described in the first embodiment, and the temperature is 200 ° C. Suppresses temperature change Diff in saturated state. At the same time, the cooking control unit 67 stops the transmission of the control signal to the pump driving means 65, and stops the supply of mist to the inside of the cooking chamber 14. Is Consequently, the temperature change Diff in internal temperature T ₄ and stably reduced, leaving little it is possible to eliminate the uneven heating for the food S, a drain for the water in the cooking chamber 14 hardly remains It can be drainless.

As described above, the microwave oven of the present embodiment further includes a mist supply device 43 as a mist supply means for ejecting water as a liquid into a mist in the cooking chamber 14, and the cooking control unit 67 is a cooking chamber. The water supply pump 43 of the mist supply device 43 is controlled so that water is ejected when the temperature T _{4 in 14 reaches the set temperature of 200 ° C.}

In this case, vaporized in superheated steam mist instantaneously to heat the object to be cooked S of the cooking chamber 14 at a moderate water molecule (superheated steam), while the inside temperature T ₄ is varied irregularly The amount of the temperature change Diff is suppressed and made uniform as compared with the oven heating of the microwave oven of the second embodiment, and the surface can be baked crispy while adding an appropriate accent to the heating of the object S to be cooked. ..

Further, the microwave oven of the present embodiment is further provided with a timer as a measuring means, and when steam cooking as heating cooking _{reaches the finishing time t 3} (place P ₃ ), the PWM control circuit 67a is used as a fluctuation data storage unit. The reading of the fluctuation data from the 81 is stopped, the control signal is sent to the hot air heater driving means 62a so as to control the sub-heater 27b by PWM, and the supply of mist to the inside of the cooking room 14 is stopped. , The transmission of the control signal to the pump driving means 65 is stopped.

Of this case, the temperature change Diff in internal temperature T ₄ and stably reduced, leaving little it is possible to eliminate the uneven heating for the food S, a drain for the water in the cooking chamber 14 hardly remains It can be drainless.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the first to fourth embodiments may be combined and implemented, and if the occurrence of voltage flicker due to the application and interruption of the input voltage can be suppressed, the power value of the main heater 27a is higher than the power value of the sub heater 27b. May be less. Further, the configuration and shape of each part of the first to fourth embodiments are not limited to those shown in the drawings, and can be changed as appropriate.

1 Microwave oven body (heat cooker)
14 Cooking room 24 Hot air unit (oven heating means)
27a Main heater 27b Sub heater 28 Hot air fan 29 Hot air motor 43 Mist supply device (mist supply means)
47 Water supply pump (mist supply means)
54 Internal temperature detecting means 62 Heater driving means (oven heating means)
62a Hot air heater driving means 64 Hot air motor driving means (oven heating means, hot air motor driving means)
67 Cooking control unit 67a PWM control circuit (heating cooking control unit)
67b Phase control circuit (cooking control unit)
81 Fluctuation data storage unit (first storage means)
81'Fluctuation data storage unit (second storage means)
S Food to be cooked Th ₁ First threshold Th ₂ Second threshold

Claims (4)

A kitchen that houses the food to be cooked and
An oven heating means for heating the object to be cooked by hot air convection,
An internal temperature detecting means for detecting the temperature in the cooking chamber and
A cooking control unit that controls the oven heating means so as to cook the object to be cooked at a set temperature is provided.
The oven heating means includes a main heater and a sub-heater for heating air, and a hot air heater driving means for passing the main heater and the sub-heater through, and the electric power value of the main heater is higher than the electric power value of the sub-heater. Is configured to be more
When the temperature in the cooking chamber reaches the first threshold value equal to or lower than the set temperature and then exceeds the second threshold value exceeding the set temperature by a predetermined temperature, the cooking control unit sends the main heater to the main heater. A control signal is sent to the hot air heater driving means so as to PWM control the sub-heater while maintaining the energization of the above.
When the temperature in the cooking chamber exceeds the second threshold value, the cooking control unit sends a control signal to the hot air heater driving means so as to cut off both the main heater and the sub heater. A cooking device featuring. The cooking control unit includes a first storage means for storing fluctuation data obtained by converting 1 / f fluctuation into data.
The claim is characterized in that the cooking control unit reads the fluctuation data from the storage means and sends a control signal to the hot air heater driving means so as to irregularly change the energization rate of the PWM control. The heating cooker according to 1. A mist supply means for ejecting a liquid into a mist in the cooking chamber is further provided.
The cooking cooker according to claim 2, wherein the cooking control unit controls the mist supply means so as to eject the liquid when the temperature in the cooking chamber reaches the set temperature. The oven heating means further includes a hot air fan that sends heated air into the cooking chamber and circulates it, a hot air motor that rotates the hot air fan in a predetermined direction, and a hot air motor driving means that rotationally drives the hot air motor. Prepare,
The cooking control unit includes a second storage means for storing fluctuation data obtained by converting 1 / f fluctuation into data.
The cooking control unit reads the fluctuation data from the storage means and receives the fluctuation data.
The heating cooker according to claim 1, wherein a control signal is sent to the hot air motor driving means so that the rotation speed of the hot air fan is irregularly changed within a predetermined range.

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