JP5959369B2 - Cooker - Google Patents

Description

  The present invention relates to a heating cooker having a heat retaining step for maintaining a preheating temperature in the preheating step as a heat retaining temperature.

  As a conventional heating cooker, while continuously energizing the upper heater and operating the hot air fan, when the internal temperature is equal to or higher than the predetermined temperature, the energization to the upper heater is stopped while maintaining the operation of the hot air fan, There is one in which the hot air heater is turned on to continue the preheating (for example, see Patent Document 1).

JP 2009-127985 A (6th page, FIG. 8)

  In the technique described in Patent Document 1 described above, when the temperature in the heating chamber exceeds a predetermined temperature, the hot air fan and the hot air heater are continuously operated to prevent abnormal overheating of the apparatus top plate. Since the hot air heater is continuously operated, the power consumption may increase.

The present invention has been made to solve the above-described problems, and a first object is to obtain a heating cooker that can suppress power consumption in the heat retention process after the preheating process. .
In addition to the first object, the second object is to obtain a cooking device capable of speeding up the temperature rise in the heating chamber even if the preheating temperature is changed in the heat retaining step.
In addition to the first and second objects, the third object is to obtain a heating cooker that can prevent the object to be heated from being burned too much in the cooking process after the heat retention process.

A heating cooker according to the present invention includes a heating chamber for cooking an object to be heated, a heater for heating the object to be heated housed in the heating chamber, and a temperature detecting means for detecting the temperature of the heating chamber. An operation unit for inputting a heating condition for heating an object to be heated; and a preheating step for heating at least the heating chamber until the preheating temperature is reached when the input heating condition includes setting of a preheating temperature, and a preheating step And a control means for controlling the temperature of each step of the heat retaining step for maintaining the temperature in the heating chamber at a predetermined temperature after the completion of heating by using a heater, and as the heater, an upper heater for heating the object to be heated from above, and the object to be heated A hot air heater having a lower heater for heating from below and an air blowing means for sucking and circulating hot air in the heating chamber, and further heating the hot air sucked by the air blowing means into hot air The control means has at least any two heaters, and the control means energizes the plurality of heaters in the preheating process, and two or more heaters in the heat retention process after the temperature detected by the temperature detection means reaches the preheating temperature. of, have rows insulation control of the heating chamber only at the heater towards low power consumption required for insulation the temperature of the heating chamber at a predetermined temperature, and in incubating process, higher than the insulation temperature new preheat temperature Is input as a heating condition, the upper heater and the hot air heater among two or more heaters are energized to enter the preheating process again and the heating chamber becomes a new preheating temperature, and the detected temperature of the temperature detecting means When the temperature reaches a new preheating temperature, only the hot air heater is energized so that the new preheating temperature is maintained as the new heat retention temperature.

  According to the present invention, in the preheating step, the plurality of heaters are energized, and in the heat retention step after the temperature detected by the temperature detecting means reaches the preheating temperature, the temperature of the heating chamber among the plurality of heaters is set at a predetermined temperature. Heat insulation control in the heating chamber is performed only with a heater having a smaller power consumption necessary for heat insulation. Thereby, the electric energy required for heat insulation in a heating chamber can be suppressed.

FIG. 3 is a perspective view showing the heating cooker according to the first embodiment. The sectional side view of the heating cooker shown in FIG. FIG. 3 is a block diagram showing a schematic configuration of a heating cooker according to the first embodiment. The temperature change figure of the heating chamber at the time of the oven heating with preheating in the heating cooker which concerns on Embodiment 1, the change figure of power consumption, and the operation | movement waveform figure of each heater and a hot air circulation unit. In the heating cooker of Embodiment 1, the temperature change in the heating chamber and the change in power consumption and the change in the power consumption in the heating chamber when the upper heater is used in addition to the hot air heater are shown. Figure. The temperature change figure of the heating chamber at the time of oven heating with preheating in the heating cooker which concerns on Embodiment 2, and the operation | movement waveform diagram of each heater and a hot air circulation unit. The temperature change figure of the heating chamber at the time of oven heating with preheating in the heating cooker which concerns on Embodiment 3, and the operation | movement waveform diagram of each heater and a hot air circulation unit. Side sectional drawing which shows the modification of the upper heater provided in the top | upper surface of the heating chamber of the heating cooker which concerns on Embodiment 1-3.

Embodiment 1 FIG.
1 is a perspective view showing a heating cooker according to Embodiment 1, and FIG. 2 is a side sectional view of the heating cooker shown in FIG.
In FIG.1 and FIG.2, the cooking-by-heating machine 1 is formed in the substantially rectangular parallelepiped shape, and the box-shaped heating chamber 2 by which the front was opened inside is provided. A door 3 for opening and closing the opening of the heating chamber 2 is provided in front of the heating chamber 2. A glass window 3a made of heat-resistant glass is attached to the door 3 so that the state of the object to be heated 5 during cooking can be confirmed. A handle 3 b for opening and closing the door 3 is provided on the upper portion of the door 3. Further, the cooking device 1 is provided with an operation panel 4 adjacent to the door 3.

  The operation panel 4 is provided with an operation unit 4a and a display unit 4b composed of a liquid crystal display. Various keys for setting heating conditions for heating the article to be heated 5 are arranged on the operation unit 4a. For example, a range key for setting microwave heating, an oven key for setting either oven heating or oven heating with preheating, a setting dial for inputting heating temperature and heating time, a start key for starting cooking, etc. are provided. Yes.

  On both side surfaces of the side of the heating chamber 2, mounting shelves (not shown) for supporting the cooking plate 6 are provided. Moreover, an upper exhaust port and a lower exhaust port (both not shown) for releasing the air in the heating chamber 2 to the outside are provided on one side surface of both side surfaces, and an external exhaust port is provided on the other side surface. An air inlet (not shown) for taking in air is provided. The above-described upper exhaust port is provided on the upper side of the mounting shelf, and the lower exhaust port is provided on the lower side of the mounting shelf.

  Outside the top surface of the heating chamber 2, an upper heater 10 made of a flat heater configured by sandwiching a nichrome wire as a heating element with mica is installed. The upper heater 10 is housed in a recess formed by the sheet metal 12 inside the upper portion of the heating cooker 1 with the upper surface covered with the heat insulating material 11, and the heating chamber 2 through the top surface of the heating chamber 2. It is configured to heat the inside. A bottom plate 13 is fixed to the bottom surface of the heating chamber 2 with silicon or the like. The bottom plate 13 is made of a ceramic member that easily transmits microwaves.

  A lower heating chamber 14 is formed by the bottom plate 13 described above. Housed in the lower heating chamber 14 are an antenna 16 attached to the tip of the rotating shaft 15 a of the motor 15 and a lower heater 17, such as a sheathed heater, disposed around the antenna 16. Under the lower heating chamber 14, a waveguide 18 connected to a magnetron (not shown) of a microwave generator is installed. The waveguide 18 guides the microwave generated by the magnetron to the antenna 16 and radiates the microwave from the antenna 16 into the heating chamber 2.

  Further, a temperature sensor 28 made of, for example, a thermistor for detecting the temperature in the heating chamber 2 is provided on the top surface of the heating chamber 2 on the back surface 2a side. Although it has been described that the temperature sensor 28 is provided on the top surface of the heating chamber 2, this is merely an example, and the side surface of the heating chamber 2 may be used.

  A hot air circulation unit 21 is provided at a position separating the back surface 2 a at the back of the heating chamber 2. The hot air circulation unit 21 forms a circulation chamber 24 by surrounding the hot air heater 22 having a hot air circulation fan 23a, a hot air motor 23 having a hot air circulation fan 23a, and the hot air heater 22 and the hot air circulation fan 23a with a back surface 2a. A partition plate 25 is provided. The hot air motor 23 and the hot air circulation fan 23a constitute a blowing means. A portion of the back surface 2a facing the hot air heater 22 is provided with an outlet 26 for blowing hot air generated by the hot air circulation unit 21 into the heating chamber 2, and also facing the hot air circulation fan 23a of the back surface 2a. The part is provided with a suction port 27 for sucking hot air in the heating chamber 2.

FIG. 3 is a block diagram showing a schematic configuration of the heating cooker according to the first embodiment.
The control circuit 41 of the heating cooker 1 heats the article to be heated 5 according to the heating condition input by the operation of the operation unit 4a. For example, the control circuit 41 controls the upper heater energizing circuit 42 and the lower heater energizing circuit 43 to heat the object to be heated 5 in the heating chamber 2 from above and below when it is determined that the heating is performed by natural convection from the input heating conditions. Let

In addition, when the control circuit 41 determines that the heating air is heated from the input heating condition, the control circuit 41 controls the upper heater energizing circuit 42, the hot air heater energizing circuit 44, and the hot air motor driving circuit 45, respectively. The object 5 is heated from above and heated with hot air. The heater power of the upper heater 10, the lower heater 17, and the hot air heater 22 is 700 W each, and the upper heater 10 and the hot air heater 22 are turned on at the same time or the upper heater 10 By turning on the lower heater 17 at the same time, a total of 1,400 W of heater power is obtained. That is, it is configured such that a larger heater power can be obtained by simultaneously turning on a plurality of heaters according to the heating mode.
In addition, when the heating condition includes preheating, the control circuit 41 includes a preheating step for heating the heating chamber 2 until the preheating temperature is reached, a heat retaining step for maintaining the preheating temperature as a heat retaining temperature, and the object to be heated 5. Each step of the cooking step for cooking by heating is performed. This point will be described in detail when the operation is described. Furthermore, when the control circuit 41 determines that the heating is performed by the microwave from the input heating condition, the control circuit 41 controls the inverter circuit 46 to generate a high-frequency voltage, and supplies the high-frequency voltage to the magnetron to generate the microwave.

Next, the operation of the oven heating with preheating in the cooking device configured as described above will be described with reference to FIG.
FIG. 4 is a temperature change diagram of a heating chamber, a power consumption amount change diagram, and an operation waveform diagram of each heater and the hot air circulation unit during oven heating with preheating in the heating cooker according to the first embodiment.
When the oven heating with preheating is set by the oven key of the operation unit 4a and then the heating temperature (preheating temperature) and the heating time are input by the operation of the setting dial, the control circuit 41 uses these as heating conditions as the heating conditions. When the heating temperature and the heating time are displayed in 4b and the start key is turned on, the preheating process is started first.

  In the preheating process, the control circuit 41 continuously energizes the upper heater 10 and continuously energizes the hot air heater 22 of the hot air circulation unit 21 and drives the hot air motor 23 to circulate hot air as shown in FIG. The fan 23a is turned on. At this time, the air in the heating chamber 2 heated by the upper heater 10 is sucked into the hot air circulation unit 21 by the hot air circulation fan 23a, becomes hot hot air by the hot air heater 22, and is blown out into the heating chamber 2 for circulation. To do.

  On the other hand, the control circuit 41 uses the input heating temperature as the preheating temperature and compares it with the temperature in the heating chamber 2 detected by the temperature sensor 28. When the temperature in the heating chamber 2 has not reached the preheating temperature, Continue the above control. By this control, the temperature in the heating chamber 2 rises as shown in FIG. 4A, and the power consumption increases in proportion to the elapsed time as shown in FIG. 4B.

  When the temperature in the heating chamber 2 detected by the temperature sensor 28 reaches the preheating temperature, the control circuit 41 turns off the energization of the upper heater 10 and the hot air heater 22 while maintaining the hot air circulation fan 23a on. Then, the warming process starts from the preheating process. In the heat insulation process, the control circuit 41 supplies power to the hot air heater 22 that consumes less power for maintaining the heat insulation temperature in the heating chamber 2 than the upper heater 10. In this case, the control circuit 41 energizes the hot air heater 22 when the temperature in the heating chamber 2 falls below the heat retention temperature so that the preheating temperature is maintained as the heat retention temperature, and the temperature in the heating chamber 2 is maintained at the heat retention temperature. When it becomes higher, the energization to the hot air heater 22 is turned off, and this heat retention control is repeated until the cooking process is started.

Here, with reference to FIG. 5, the case where the heat insulation temperature is maintained using the upper heater 10 in addition to the hot air heater 22 will be described in comparison with the first embodiment.
FIG. 5 shows changes in temperature and power consumption in the heating chamber in the case where the upper heater is used in addition to the change in temperature and power consumption in the heating chamber in the heat-retaining step of the first embodiment. It is a figure which shows a change. In addition, T1 of Fig.5 (a) shows the temperature change in the heating chamber 2 in the heating cooker 1 of Embodiment 1, and T2 shows the temperature change at the time of using an upper heater in addition to a hot air heater. Moreover, W1 of FIG.5 (b) shows the change of the power consumption in the heating cooker 1 of Embodiment 1, and W2 shows the change of the power consumption when an upper heater is used in addition to a hot air heater.

  As shown in the figure, in the heating cooker 1 according to the first embodiment, the temperature T1 changes finely compared to T2 while the power consumption W1 is small because the upper heater 10 is not used. It can be seen that the temperature is maintained. This is because the upper heater 10 is configured to heat the inside of the heating chamber 2 through the top surface of the heating chamber 2 as compared with the hot air heater 22 that directly heats the air circulating in the heating chamber 2. The ability to maintain the temperature of the chamber 2 results from being inferior to the hot air heater 22. In addition, the temperature change is fine because the upper heater 10 is not energized and the instantaneous heater power is reduced, so that the temperature change in the heating chamber 2 is moderate. This is because the hot air heater 22 directly heats the air in the heating chamber 2, so that a temperature difference (shift in correlation) between the temperature in the heating chamber 2 and the temperature sensor 28 is less likely to occur. That is, the heat insulation temperature can be maintained only by using the hot air heater 22 and the hot air circulation fan 23a, and the power consumption W1 can be suppressed.

  As described above, according to the first embodiment, the hot air heater 22 that consumes less power for maintaining the heat insulation temperature in the heating chamber 2 than the upper heater 10 is used when the preheat process is shifted to the heat insulation process. Since it does in this way, the electric energy required for the heat retention in the heating chamber 2 can be suppressed. In other words, in the heat insulation process, the heat insulation control is performed by energizing only the heater that requires the smallest amount of electric power required for the predetermined temperature rise in the heating chamber 2 among the plurality of heaters. The amount of power required for heat insulation can be suppressed.

Embodiment 2. FIG.
FIG. 6 is a temperature change diagram of the heating chamber at the time of oven heating with preheating in the heating cooker according to the second embodiment, and operation waveform diagrams of each heater and the hot air circulation unit. In addition, in this Embodiment 2, since the structure and block diagram of the heating cooker 1 are the same as Embodiment 1, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1, and Embodiment. The control circuit 41 different from 1 will be described.

  The control circuit 41 of the heating cooker 1 according to the second embodiment turns on / off the energization to the hot air heater 22 of the hot air circulation unit 21 so that the heat insulation temperature is maintained in the heat insulation process, and the hot air circulation fan 23a. When the high-temperature air (hot air) in the heating chamber 2 is circulated by, for example, as shown in FIG. 6B, the preheating temperature is higher than the temperature during the heat retention (referred to as the second preheating temperature). ), The upper heater 10 is continuously energized again, the energization of the hot air heater 22 is switched to continuous energization, and the preheating process is started again.

  Then, the control circuit 41 compares the temperature in the heating chamber 2 detected by the temperature sensor 28 with the second preheating temperature. As shown in FIG. 6A, the control circuit 41 continues the above-described control when the temperature in the heating chamber 2 has not reached the second preheating temperature, and the temperature in the heating chamber 2 increases. When the second preheating temperature is reached, the power supply to the upper heater 10 and the hot air heater 22 is turned off. Thereafter, the control circuit 41 starts energization of the hot air heater 22 again so that the second preheating temperature is maintained as a new warming temperature. In this case, the control circuit 41 energizes the hot air heater 22 when the temperature in the heating chamber 2 falls below the heat insulation temperature, and energizes the hot air heater 22 when the temperature in the heating chamber 2 becomes higher than the heat insulation temperature. Is turned off, and this heat retention control is repeated until the cooking process is started.

  As described above, according to the second embodiment, when the preheating temperature is changed to a temperature higher than the temperature during the heat retaining process, the upper heater 10 is continuously energized again and the operation of the hot air circulation fan 23a is maintained. Since the energization of the hot air heater 22 is switched to the continuous energization while maintaining the temperature, the temperature in the heating chamber 2 can be quickly raised.

Embodiment 3 FIG.
FIG. 7 is a temperature change diagram of the heating chamber at the time of oven heating with preheating in the heating cooker according to Embodiment 3, and operation waveform diagrams of each heater and the hot air circulation unit. In addition, in this Embodiment 3, since the structure and block diagram of the heating cooker 1 are the same as Embodiment 1, the same code | symbol is attached | subjected to the same or equivalent part as Embodiment 1, and Embodiment. The control circuit 41 different from 1 will be described.

  When the control circuit 41 of the heating cooker 1 according to Embodiment 3 detects the opening of the door 3 of the heating cooker 1 while performing the heat retaining step, as shown in FIG. The energization of the heater 22 is turned off, the driving of the hot air motor 23 is stopped, and the operation of the hot air circulation fan 23a is turned off. At this time, the temperature in the heating chamber is drastically lowered by opening the door 3 and stopping the heating operation (see FIG. 7A).

  When the control circuit 41 detects the start of cooking by operating the start key of the operation unit 4a, the control circuit 41 determines that the door 3 is closed, starts energization of the upper heater 10 and the lower heater 17, and hot air circulation unit 21. The operation of only the hot air circulation fan 23a is resumed, and the process proceeds from the preheating process to the cooking process. At this time, the hot air circulation fan 23a is operated because the hot air heater 22 is energized in the preheating step and the heat retaining step, so that hot air is hot inside the hot air heater 21 and the hot air circulation unit 21. This hot air prevents the back side of the heated object 5 from being burnt and becomes uneven, and helps to increase the temperature in the heating chamber 2 by circulating the heated hot air in the heating chamber 2 and quickly This is to make the uniform. By this operation, high-temperature air (hot air) in the heating chamber 2 circulates, whereby the temperature in the heating chamber 2 due to radiant heat from the upper heater 10 and the lower heater 17 becomes uniform, and the heated object 5 is heated. Is done. In this state, the temperature in the heating chamber 2 gradually increases.

  The control circuit 41 determines whether or not a predetermined time (for example, 3 minutes) has elapsed since the start of the cooking process. When the predetermined time has not elapsed, the control circuit 41 maintains the aforementioned control, and when the predetermined time has elapsed. Then, the operation of the hot air circulation fan 23a is turned off. Then, the control circuit 41 turns on the energization of the upper heater 10 and the lower heater 17 from continuous energization so that the temperature is maintained when the temperature in the heating chamber 2 rises to near the heat retention temperature. Switch to OFF.

  As described above, according to the third embodiment, in the cooking process in which the heated object 5 is cooked by the upper heater 10 and the lower heater 17, the hot air heater 22 is turned off and the hot air circulation fan 23a is operated. I do it for 3 minutes. Thereby, since the temperature in the heating chamber 2 becomes uniform, the object to be heated 5 can be cooked without unevenness, and the object to be heated 5 is partially heated by the hot air that has flown in the hot air heater 22 or the hot air circulation unit 21. You won't be scorched.

  In the third embodiment, the hot air circulation fan 23a is operated for 3 minutes when shifting from the heat retaining process to the cooking process, but the time is an example and is not limited. Moreover, you may make it drive | operate until it reaches predetermined temperature instead of time. For example, when the temperature in the heating chamber 2 falls below a preset temperature with respect to the preheating set temperature, the temperature in the hot air heater 22 and the hot air circulation unit 21 is determined to be low, The operation time may be determined according to the temperature in the heating chamber 2 detected by the sensor 28.

  Moreover, in Embodiment 1-3, although the upper heater 10 installed in the top | upper surface of the heating chamber 2 was made into the flat heater, it is not limited to this. For example, as shown in FIG. 8, an upper heater 10 a of any one of a glass tube heater, a halogen heater, and a carbon heater may be installed on the top surface of the heating chamber 2.

  In Embodiments 1 to 3, the hot air heater 22 and the hot air circulation fan 23a are used to maintain the heat insulation temperature when the preheat process is shifted to the heat insulation process, but instead of the hot air heater 22, heating is performed. You may make it use the upper heater 10 with small power consumption required to maintain the heat retention temperature in the chamber 2.

  Moreover, although Embodiment 1-3 demonstrated the heating cooker provided with the oven function and the range function, it is not limited to this, The heating cooker provided only with the oven function may be sufficient.

  DESCRIPTION OF SYMBOLS 1 Heating cooker, 2 Heating chamber, 2a Back surface, 3 Door, 3a Glass window, 3b Handle, 4 Operation panel, 4a Operation part, 4b Display part, 5 Heated object, 6 Cooking plate, 10, 10a Upper heater, 11 Insulation, 12 Sheet metal, 13 Bottom plate, 14 Lower heating chamber, 15 Motor, 15a Rotating shaft, 16 Antenna, 17 Lower heater, 18 Waveguide, 21 Hot air circulation unit, 22 Hot air heater, 23 Hot air motor, 23a Hot air circulation Fan, 24 Circulation chamber, 25 Partition plate, 26 Air outlet, 27 Air inlet, 28 Temperature sensor, 41 Control circuit, 42 Upper heater energizing circuit, 43 Lower heater energizing circuit, 44 Hot air heater energizing circuit, 45 Hot air motor drive circuit, 46 Inverter circuit.

Claims (6)

A heating chamber for cooking the object to be heated;
A heater for heating an object to be heated stored in the heating chamber;
Temperature detecting means for detecting the temperature of the heating chamber;
An operation unit for inputting a heating condition for heating an object to be heated;
When the input heating condition includes setting of a preheating temperature, a preheating step of heating at least the heating chamber until the preheating temperature is reached, and a heat retaining step of maintaining the heating chamber at a predetermined temperature after the preheating step is completed. And a control means for controlling the temperature of each step using the heater,
The heater includes an upper heater that heats the object to be heated from above, a lower heater that heats the object to be heated from below, and a blowing unit that sucks and circulates high-temperature air in the heating chamber. Among the hot air heaters that further heat the high-temperature air sucked in by the air to make hot air, the heater has at least any two heaters,
In the preheating step, the control means energizes the plurality of heaters, and in the heat retention step after the temperature detected by the temperature detection means reaches the preheating temperature, the heating means among the two or more heaters. There line heat keeping control of the heating chamber only at the heater towards low power consumption required to heat retaining temperature of the chamber at a predetermined temperature, and in incubating process, new preheating temperature higher than the retained temperature heating conditions Is input, the upper heater and the hot air heater among the two or more heaters are energized so that the heating chamber again enters a preheating step and the heating chamber becomes a new preheating temperature. when the detected temperature reaches a new preheat temperature, as a new preheat temperature is maintained as the new retained temperature, pressure, characterized by energizing only the hot air heater Cooker. Wherein the plurality of heaters includes a hot air heater, the heater towards low power consumption required for insulation the temperature of the heating chamber at a predetermined temperature, according to claim 1 Symbol, characterized in that the said hot-air heater The listed cooking device. Wherein the plurality of heaters includes upper heaters, heater towards low power consumption required for insulation the temperature of the heating chamber at a predetermined temperature, according to claim 1 Symbol, characterized in that the said on a heater The listed cooking device. The heater includes an upper heater, a lower heater, and a hot air heater,
The control means includes a cooking process in which the object to be heated is cooked after the heat retention process. In the cooking process, the upper heater and the lower heater are energized, and the blowing means of the hot air heater is operated. The cooking device according to any one of claims 1 to 3, wherein the cooking device is a cooking device. The cooking device according to claim 4 , wherein the control means operates the air blowing means from a start of the cooking process to a preset time. The cooking device according to claim 4 , wherein the control means operates the blowing means until the temperature in the heating chamber is lowered below a preset temperature from the start of the cooking process.

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