JP3997574B2 - High-frequency heating device with heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a high-frequency heating device with a heater.
[0002]
[Prior art]
In the case of a conventional high-frequency heating apparatus with a heater having upper and lower heaters, there are lower heaters in which a sheathed heater is arranged at the bottom of the heating chamber and those in which a planar heater as shown in FIG. 6 is arranged in the bottom of the heating chamber. . This planar heater has a configuration in which a heater wire 1 is wound around a winding frame 2 made of a heat-resistant insulating material such as mica and the upper and lower sides thereof are sandwiched by an insulating plate 3 such as mica. They are arranged with screws or the like so as to be in contact with the outer surface 5.
[0003]
In addition, these heaters are intermittently controlled by a temperature sensor provided in the heating chamber so as to maintain the heating chamber atmosphere temperature at a predetermined temperature, or only provided with a safety device that is turned off only at an excessive temperature rise. .
[0004]
In recent years, electromagnetic induction heating heaters have been used in cooking appliances such as plates for pottery because of their excellent safety, cleanliness, and high efficiency, as well as the fact that the pots and plates themselves, which are loads, generate heat directly. For example, Japanese Patent Application Laid-Open No. 8-138864 has filed a patent that describes application to a high-frequency heating apparatus with a heater.
[0005]
[Problems to be solved by the invention]
However, in the conventional high-frequency heating device with a heater, it is desirable to perform both heating of the microwave and the heater at the same time from the viewpoint of shortening the cooking time, but in practice, due to the limitation of the power supply capacity, the magnetron and the heater are energized. It is difficult to simultaneously perform these operations, and these must be operated by energizing them alternately, or one input must be squeezed in some way. As is well known, this is a general high-frequency heating device having a high-frequency output of 500 W, even though a general household breaker capacity is 100 V, 15 A and about 1400 W is the practical upper limit, and about 1000 W. It is clear from the fact that power consumption is required. As a result, the time required for cooking is increased, the amount of dehydrated food is increased, and cooking cannot be performed with good finish.
[0006]
In order to alleviate the problem, there are many cases in which preheating operation is instructed, but it is necessary to perform preheating manually immediately before use, which is complicated and takes time for preheating. In addition, even if preheating is performed, if the door is opened to put food, most of the hot air is released, resulting in a large energy loss and little effect on improving the finishing of cooking.
[0007]
Further, when a planar heater is used at the outer bottom of the heating chamber, the insulating material and heat insulating material constituting the heater and the wall surface of the heating chamber must first be heated, so that it takes time to start up and the reactivity is poor.
[0008]
In addition, when an induction heating type heater is used, not only the problem cannot be solved, but also the temperature directly above the heating coil tends to raise the temperature, so that uneven baking occurs and cooking cannot be performed well.
[0009]
Furthermore, the conventional high-frequency heating device with a heater is configured to control the heater so that the temperature in the heating chamber becomes a predetermined temperature or continuously energizes, and the heater is controlled regardless of the temperature of the food. There was a problem that power could not be supplied efficiently, the temperature rise at the beginning of cooking was slow and time consuming, and it burned at the end of cooking.
[0010]
[Means for Solving the Problems]
In order to solve the above problems, a heating chamber for storing food, a waveguide for guiding microwaves generated by a magnetron to the upper side of the heating chamber, a rotating antenna for radiating the microwaves to the heating chamber, and the food A heating plate heater having a structure in which two sheathed heaters are embedded in a heat block having a large heat capacity is used as the lower heater. The heater is configured to preheat by energizing the lower heater of the plate heater, and the temperature of the heat block surface at the substantially central portion of the surface opposite to the surface to be heated of the hot plate heater is measured by the temperature detecting means. The heater is intermittently controlled so that the temperature of the heater becomes a preset temperature, and energization for preheating to the hot plate heater provided at the bottom of the heating chamber is preliminarily supplied from the operation unit. It is started by the start signal and is controlled to keep the temperature A for a predetermined time after reaching the temperature A after the final preheating start signal or the final door opening or closing signal input according to the pattern stored in the control unit in advance. Thereafter, the temperature B lower than the temperature A is controlled to be maintained for a predetermined time including the transition time from A to B, and the heat generated by the sheathed heater is efficiently transferred to the heat block. Diffuses and hardly causes uneven baking.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
A high-frequency heating apparatus with a heater of the present invention includes a heating chamber for storing food, a waveguide for guiding microwaves generated by a magnetron to the upper side of the heating chamber, a rotating antenna for radiating the microwaves to the heating chamber, An upper heater that radiates and heats the food, and a lower heater that conducts and heats the food, and uses a hot plate heater that has two sheathed heaters embedded in a heat block having a large heat capacity as the lower heater. It is configured to conduct preheating by energizing the lower heater of the hot plate heater, and measure the heat block surface temperature at the substantially central portion of the surface opposite to the heated object mounting surface of the hot plate heater with the temperature detecting means, The heater is intermittently controlled so that the temperature of the part becomes a preset temperature, and energization for preheating to the hot plate heater provided at the bottom of the heating chamber is operated. Initiated by preheating start signal from accordance pattern is stored in advance in the control unit, the final preheat start signal or the last door open or closed signal input temperature A reaches at later after a predetermined time so as to keep the temperature A Thereafter, the temperature B lower than the temperature A is controlled to be maintained for a predetermined time including the transition time from A to B.
[0012]
And since the heat | fever which generate | occur | produced with the sheathed heater is efficiently transmitted and spread | diffused to a heat block by the good heat-transfer property of aluminum, a baking nonuniformity does not arise easily.
[0013]
In addition, since the temperature of the heater can be measured directly, it is possible to realize highly accurate temperature control with good reactivity, supply the appropriate amount of energy necessary for heating in a timely manner, increase the cooking speed, The variation in cooking can be suppressed, and the quality of cooking can be improved.
[0014]
Furthermore, heat can be stored in a heat block that has heat capacity for energy saving during non-cooking, and the stored energy can be used for food heating during cooking, so that cooking can be performed at high speed within limited power consumption, and in preheating operation. Since the heat is stored in the heat block instead of raising the atmosphere in the cabinet, most of the energy is not released by opening the door.
[0015]
Moreover, it was set as the structure which uses the two sheathed heaters which can be controlled independently.
[0016]
When there is a sufficient power capacity, such as when preheating is started up or when cooking without using microwaves, the two can be energized at the same time to quickly raise the heat block temperature and the food temperature. By using only this, simultaneous cooking of microwave heating and heater heating can be realized in a form that satisfies the limitation of power supply capacity.
[0017]
Further, the heating object mounting surface of the hot plate heater is exposed to the bottom surface of the heating chamber and forms a part or all of the bottom surface of the heating chamber.
[0018]
And since a heater can heat a foodstuff directly without inclusions, heating efficiency is good.
[0019]
In addition, an operation unit that inputs a heating code, a storage unit that stores heating conditions, and a control unit, the control unit searches the storage unit based on the heating code input from the operation unit, The heating method corresponding to the cord is called, and the food is heated by controlling the upper and lower heaters and the magnetron accordingly.
[0020]
And food can be heated optimally by simple operation.
[0021]
【Example】
Hereinafter, a high-frequency heating apparatus with a heater according to an embodiment of the present invention will be described with reference to the drawings.
[0022]
FIG. 1 is a partial front sectional view of a high-frequency heating apparatus with a heater according to an embodiment of the present invention. Above the heating chamber 6, a waveguide 7 that guides the microwave generated by the magnetron, a rotating antenna 8 that radiates the microwave to the heating chamber 6, and an upper sheathed heater 9 are disposed. For the purpose of preventing contamination of the rotating antenna 8 between the rotating antenna 8 and the upper sheathed heater 9, the partition plate 10 made of a heat-resistant material with low dielectric loss such as crystallized glass is attached so as to contact the upper wall of the heating chamber. It is attached using a metal fitting 11.
[0023]
Further, the upper sheathed heater 9 has a shape as shown in FIG. 2 when viewed from the upper part of the heating chamber 6, and a holder 12 made of a heat-resistant insulating material such as pottery is located at a position slightly away from the upper wall surface of the heating chamber 6. Is held by.
[0024]
On the bottom surface of the heating chamber 6, a hot plate heater having a structure in which two lower sheathed heaters 14 a and 14 b that can be independently controlled are embedded in a heat block 13 having a thickness made of an aluminum alloy is used. The mounting surface is exposed to the heating chamber 6, and most of the bottom surface of the heating chamber 6 is formed. The lower sheathed heaters 14 a and 14 b have the shape and arrangement as shown in FIG. 3 when viewed from the top of the heating chamber 6, and are embedded in the bottom of the heat block 13 so as to be in contact with each other.
[0025]
In addition, a temperature detection means 15 is disposed on the substantially central surface of the back surface of the heat block 13 to detect the temperature of the heat block 13 so that the temperature of the portion becomes a preset temperature. 14b is configured to perform intermittent control.
[0026]
FIG. 4 is a time chart of the preheating operation of the high frequency heating apparatus with a heater according to the embodiment of the present invention, and FIG. 5 is a block diagram thereof.
[0027]
Energization for preheating the lower sheathed heaters 14a and 14b is started by a preheating start signal from the operation unit 16, and according to a pattern stored in the control unit 17 in advance, a final preheating start signal or a final door opening, or After reaching the temperature A after the closing signal is input, the temperature A is controlled to be maintained for a predetermined time, and thereafter, the temperature B lower than the temperature A is maintained for a predetermined time including the transition time from A to B. Controlled.
[0028]
Furthermore, when a heating code corresponding to food is input from the operation unit 16, the control unit 17 searches the storage unit 18 based on the heating code, calls a heating method corresponding to the code, and accordingly, the upper sheath heater 9 or The lower sheathed heaters 14 a and 14 b and the magnetron 19 are controlled to heat the food 20.
[0029]
【The invention's effect】
As is clear from the above description, the following effects can be obtained according to the high-frequency heating apparatus with a heater of the present invention.
[0030]
This is a high-frequency heating device with a heater that starts preheating with a heater, and the bottom heater uses a hot plate heater with a heat block embedded in a heat block with a large heat capacity. Due to the good transmission, it is efficiently transmitted and diffused to the heat block, so that uneven baking is less likely to occur.
[0031]
Also, measure the heat block surface temperature at the approximate center opposite to the surface on which the object to be heated of the hot plate heater is placed, using the temperature detection means, and turn the heater on and off so that the temperature of that part becomes the preset temperature. By adopting a control structure, the temperature of the heater can be measured directly, so that highly accurate temperature control with good reactivity can be realized, and the proper amount of energy necessary for heating can be supplied in a timely manner, and the cooking speed can be increased. In addition to being quicker, it is possible to suppress variations in cooking such as burnt colors, and improve the quality of cooking.
[0032]
In addition, energization for preheating to the hot plate heater provided on the bottom surface of the heating chamber is started by a preheating start signal from the operation unit, and according to a pattern stored in the control unit in advance, a final preheating start signal or a final door After reaching the temperature A after the opening or closing signal is input, the predetermined time is controlled so as to keep the temperature A. After that, the temperature B lower than the temperature A is included in the predetermined time including the transition time from A to B. By controlling so as to keep the time, heat is stored in a heat block with heat capacity for energy saving during non-cooking, and cooking is performed at high speed within limited power consumption by using the heat storage energy for food heating during cooking together may be, since the heat storage in the heat block rather than enhance the internal atmosphere in the preheating operation, this, which would release a major portion of the precious energy by door opening There is no.
[0033]
In addition, by enabling the two sheathed heaters to be controlled independently, when there is sufficient power capacity, such as when preheating is started up or when cooking is not performed using microwaves, the two heaters are energized at the same time, and the heat block temperature is increased quickly. In addition, the temperature of the food can be raised, and the simultaneous cooking of the microwave heating and the heater heating can be realized in a form satisfying the limitation of the power supply capacity by using only one food.
[0034]
In addition, since the heated object mounting surface of the hot plate heater is exposed on the bottom surface of the heating chamber and forms part or all of the bottom surface of the heating chamber, the heater can directly heat food without inclusions. Heating efficiency is good.
[0035]
Also, an operation unit that inputs a heating code, a storage unit that stores heating conditions, and a control unit, the control unit searches the storage unit based on the heating code input from the operation unit, By calling up the heating method corresponding to the cord and controlling the upper and lower heaters and magnetron accordingly to heat the food, the food can be optimally heated with a simple operation.
[Brief description of the drawings]
FIG. 1 is a front partial sectional view of a high-frequency heating apparatus with a heater in an embodiment of the present invention. FIG. 2 is a top view of an upper sheathed heater of the high-frequency heating apparatus with the heater. Top view of sheathed heater [Fig. 4] Time chart of preheating operation of high-frequency heating device with same heater [Fig. 5] Block diagram of high-frequency heating device with same heater [Fig. 6] Planar heater of conventional high-frequency heating device with heater Configuration diagram [Explanation of symbols]
6 Heating chamber 7 Waveguide 8 Rotating antenna 9 Upper sheathed heater 13 Heat block 14a Lower sheathed heater a
14b Lower sheathed heater b
DESCRIPTION OF SYMBOLS 15 Temperature detection means 16 Operation part 17 Control part 18 Memory | storage part 19 Magnetron

Claims (4)

A heating chamber for storing food, a waveguide for guiding the microwave generated by the magnetron to the upper side of the heating chamber, a rotating antenna for radiating the microwave to the heating chamber, an upper heater for radiant heating of the food, A heat plate heater having a structure in which two food heaters are embedded in a heat block having a large heat capacity is used as the lower heater, and the lower heater is energized to the lower heater of the heat plate heater. The temperature of the heat block is measured by the temperature detecting means at the substantially central portion of the surface opposite to the surface on which the object to be heated of the hot plate heater is placed, and the temperature of the portion is set to a preset temperature. As described above, the heater is intermittently controlled, and energization for preheating to the hot plate heater provided on the bottom of the heating chamber is started by a preheating start signal from the operation unit, In accordance with the pattern stored in advance in the control unit, the temperature is controlled to be maintained for a predetermined time after reaching the temperature A after the final preheating start signal or the final door opening or closing signal is input, and thereafter A high-frequency heating apparatus with a heater, which is controlled so as to maintain a temperature B lower than the temperature A for a predetermined time including a transition time from A to B.   The high frequency heating apparatus with a heater according to claim 1, wherein the two sheathed heaters embedded in the hot plate heater are independently controllable and are energized at the same time when the preheating is started.   The high-frequency heating apparatus with a heater according to claim 1, wherein a surface on which the object to be heated of the hot plate heater is exposed is exposed to a bottom surface of the heating chamber and forms a part or the whole of the bottom surface of the heating chamber. An operation unit that inputs a heating code, a storage unit that stores a heating condition, and a control unit. The control unit searches the storage unit based on the heating code input from the operation unit, and the code The high frequency heating apparatus with a heater according to claim 1, wherein the food is heated by calling a heating method corresponding to the above and controlling the upper and lower heaters and the magnetron accordingly.

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