JPH11135255A - High frequency heating device with heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the cooking time and enhance the finishing workmanship of cooking by introducing such an arrangement that the microwave heating and heating with a heater can be performed simultaneously while the capacity of power supply is put under restriction. SOLUTION: As a bottom heater of a heating chamber 6, a hot plate heater is used of such a structure that sheath heaters 14a and 14b are embedded in a heat block 13 having a large thermal capacity made of aluminum or aluminum alloy, and at the time of preheat running, current is carried to two heaters 14a and 14b so that heat is accumulated in the heat block 13 quickly, and at the time of cooking, the accumulated thermal energy is used to heat the food in combination with one of the heaters. Thereby simultaneous cooking with a heating with heater and microwave heating can be accomplished while the capacity of power supply is put under restriction, and it is possible to cook quickly with fine finishing workmanship ensured, and the heat generated by the two sheath heaters 14a and 14b are transmitted to the heat block and dispersed effectively, and unevenness in the baking workmanship is not likely generated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device equipped with a heater.

[0002]

2. Description of the Related Art Conventionally, in the case of a high-frequency heating apparatus with a heater having upper and lower heaters, a lower heater is provided with a sheathed heater at the bottom of the heating chamber or a lower heater at the bottom of the heating chamber as shown in FIG.
As shown in FIG. 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 portions thereof are similarly sandwiched between insulating plates 3 such as mica. It is arranged with screws or the like so as to be in contact with the outer surface 5.

In addition, these heaters are either intermittently controlled by a temperature sensor provided in the heating chamber so as to maintain the temperature of the heating chamber at a predetermined temperature, or provided only with a safety device which is turned off only when the temperature is excessively high. Met.

[0004] In recent years, electromagnetic induction heating type heaters have excellent characteristics such as safety, cleanliness and high efficiency, and also have the characteristic that the pot or plate itself, which is a load, directly generates heat. For example, Japanese Patent Application Laid-Open No. 8-138864 has also filed a patent describing its application to a high-frequency heating device with a heater.

[0005]

However, in the conventional high-frequency heating apparatus 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 and the like. Moreover, it is difficult to energize the magnetron and energize the heater at the same time.
These must be alternately energized to operate, or one of the inputs must be used in a certain manner. As is well known, although the practical upper limit is about 1400 W at a breaker capacity of 100 V and 15 A for a general household which is widely used, the high frequency output of a general high frequency heating device is 500 W, and it is about 1000 W. It is evident from the need for power consumption. As a result, the time required for cooking increases, the amount of dehydration of the food increases, and it is not possible to cook well.

[0006] In order to alleviate the above-mentioned problems, it is often instructed to perform a preheating operation. However, it is necessary to manually perform the preheating immediately before use, which is complicated and time-consuming. Also, if you open the door to put food even if you preheat it, most of the hot air will be released,
The energy loss is large and the effect of improving the finish of cooking is small.

[0007] When a planar heater is used at the bottom of the heating chamber, the temperature of the insulating material and the heat insulating material constituting the heater and the wall surface of the heating chamber must be increased first, and it takes a long time to start up and the reactivity is low. bad.

[0008] Even when an induction heating type heater is used, the above-mentioned problems cannot be solved, and the temperature of the upper portion of the heating coil is easily increased, so that uneven grilling occurs and cooking cannot be performed well.

Furthermore, the conventional high-frequency heating apparatus with a heater has a configuration in which the heater is controlled so that the ambient temperature of the heating chamber is at a predetermined temperature or a configuration in which continuous energization is performed, and the heater is controlled regardless of the food temperature. However, power cannot be efficiently supplied to the heater, and it takes a long time to elevate the temperature at the beginning of cooking, and there is a problem of burning in the latter half of cooking.

[0010]

Means for Solving the Problems To solve the above problems, a high frequency heating apparatus equipped with a heater has a configuration in which a sheath heater is embedded in a heat block having a large heat capacity in the bottom heater, so that the heat generated by the sheath heater is obtained. Is efficiently transmitted to the heat block and diffused, and uneven baking is unlikely to occur.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION The high-frequency heating apparatus with a heater according to the present invention uses a hot plate heater in which two sheathed heaters are embedded in a heat block having a large heat capacity in a bottom heater.

Since the heat generated by the sheathed heater is efficiently transmitted and diffused to the heat block due to the good heat transfer properties of aluminum, unevenness in baking hardly occurs.

Further, two sheathed heaters embedded in the hot plate heater were formed in a similar shape, and embedded in the heat block in such a manner that the heat generating portions of the two sheathed heaters were in contact with each other.

The two heaters function as a single heater whose output can be switched between two stages, and there is almost no difference in heat distribution when either one is used or when two are used simultaneously. .

[0015] Further, a configuration is used in which two sheathed heaters which can be controlled independently are used. When there is enough power capacity, such as when starting up preheating or cooking without using microwaves, two power supplies can be energized at the same time to quickly raise the heat block temperature or food temperature. With the use of only the heater, the simultaneous cooking of the microwave heating and the heater heating can be realized while satisfying the limitation of the power supply capacity.

Further, the object-to-be-heated surface of the hot plate heater is exposed to the bottom surface of the heating chamber to form a part or all of the bottom surface of the heating chamber.

Since the heater can directly heat the food without inclusions, the heating efficiency is high. In addition, the temperature of the heat block surface at a substantially central portion of the surface of the hot plate heater opposite to the surface on which the object is to be heated is measured by a temperature detecting means, and the heater is turned on and off so that the temperature of the portion becomes a preset temperature. The control was performed.

Further, since the temperature of the heater can be directly measured, a highly responsive and accurate temperature control can be realized, the energy required for heating can be supplied in an appropriate amount in a timely manner, and the cooking speed is increased and Variations in cooking such as color can be suppressed, and the quality of cooking can be improved.

The energization for preheating 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 the final preheating start signal or a final preheating start signal or a preheating signal is stored according to a pattern stored in the control unit in advance. After reaching the temperature A after the final door opening or closing signal is input, the temperature is controlled to be maintained at the temperature A for a predetermined time, and thereafter, the temperature B lower than the temperature A and the transition time from A to B are also controlled. It is controlled so as to keep it for a predetermined time.

By storing heat in a heat block having a heat capacity for energy saving during non-cooking and using the stored heat for cooking food during cooking, cooking can be performed at high speed with limited power consumption. The pre-heating operation stores the heat in the heat block instead of increasing the atmosphere inside the chamber, so that most of the energy is not released by opening the door.

[0021] The apparatus further includes an operation unit for inputting a heating code, a storage unit for storing heating conditions, and a control unit. The control unit stores the storage unit based on the heating code input from the operation unit. A search was made, a heating method corresponding to the code was called, and the food was heated by controlling the upper and lower heaters and the magnetron accordingly.

Further, the food can be optimally heated by a simple operation.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A high-frequency heating device with a heater according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a front partial 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 for guiding microwaves generated by a magnetron, a rotating antenna 8 for radiating the microwaves to the heating chamber 6, and an upper sheath heater 9 are arranged. A rotating antenna 8 is provided between the rotating antenna 8 and the upper sheath heater 9.
A partition plate 10 made of a low-dielectric-loss heat-resistant material such as crystallized glass is attached to the upper wall of the heating chamber using a mounting bracket 11 in order to prevent contamination of the heating chamber.

The upper sheath heater 9 has a shape as shown in FIG. 2 when viewed from above the heating chamber 6.
Is held at a position slightly away from the upper wall surface by a holder 12 made of a heat-resistant insulating material such as pottery.

On the bottom surface of the heating chamber 6, a hot plate heater having a structure in which two independently controlled lower sheath heaters 14a and 14b are embedded in a heat block 13 having a thickness made of an aluminum alloy is used. The heated object mounting surface is exposed to the heating chamber 6 and forms most of the bottom surface of the heating chamber 6. The lower sheathed heaters 14a and 14b are shaped and arranged as shown in FIG. 3 when viewed from above the heating chamber 6, and are embedded in the bottom of the heat block 13 so that they are in contact with each other.

A temperature detecting means 15 is disposed on the substantially central portion of the back surface of the heat block 13 to detect the temperature of the heat block 13 and to lower the temperature of the portion to a preset temperature. Heaters 14a and 14
The intermittent control of b is performed.

FIG. 4 is a time chart of a 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 of the same. The 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 input of the close signal, the temperature is controlled so as to maintain the temperature A 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. Is controlled.

Further, when a heating code corresponding to the 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 calls the upper sheath heater. 9, the lower sheathed heaters 14a and 14b, and the magnetron 19 are controlled to heat the food 20.

[0030]

As is clear from the above description, the high-frequency heating apparatus with a heater according to the present invention has the following effects.

By using a heat plate heater having a configuration in which a sheath heater is embedded in a heat block having a large heat capacity as the bottom heater, heat generated by the sheath heater is efficiently transmitted to the heat block due to the good heat transfer property of aluminum. Due to diffusion, uneven baking is unlikely to occur.

Also, two sheathed heaters embedded in the hot plate heater are formed in a similar shape, and the two sheathed heaters are embedded in a heat block in such a manner that the heat generating portions of the two sheathed heaters are in contact with each other, so that the two heaters output power. Functions as one heater that can be switched in two stages, and there is almost no difference in heat distribution when either one is used or when two are used at the same time.

In addition, by making the two sheathed heaters independently controllable, two heaters can be energized at the same time when there is sufficient power capacity, such as at the time of starting preheating or cooking without using microwaves. The temperature of the heat block and 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 piece.

The heated platen mounting surface of the hot plate heater is
With a configuration in which the heater is exposed to the bottom surface of the heating chamber and partially or entirely forms the bottom surface of the heating chamber, the heater can directly heat the food without any inclusions, so that the heating efficiency is high.

Further, the temperature of the heat block surface at the approximate center of the surface of the hot plate heater opposite to the surface on which the object is to be heated is measured by temperature detecting means, and the temperature of the portion is set to a preset temperature. By adopting a configuration that performs intermittent control of the heater, the temperature of the heater can be measured directly, realizing highly accurate temperature control with good reactivity, supplying the necessary amount of energy necessary for heating in a timely manner, As the cooking speed increases, variations in cooking such as burnt colors can be suppressed, and the quality of cooking can be improved.

The energization for the preheating of the hot plate heater provided at the bottom 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 After reaching the temperature A after the final door opening or closing signal is input, the temperature is controlled to be maintained at the temperature A for a predetermined time, and thereafter, the temperature B lower than the temperature A and the transition time from A to B are also controlled. By controlling so as to keep it for a predetermined time, heat is stored in a heat block with heat capacity for energy saving during non-cooking, and the heat storage energy is used for heating food during cooking, so that high speed can be achieved within limited power consumption. Not only can cooking be performed, but also the preheating operation saves the atmosphere inside the chamber, instead of storing it in the heat block, so most of the energy is released by opening the door. Never would.

[0037] Further, there is provided an operation section for inputting a heating code, a storage section for storing heating conditions, and a control section, wherein the control section stores the storage section based on the heating code input from the operation section. By searching and calling the heating method corresponding to the code and controlling the upper and lower heaters and the magnetron to heat the food according to the search, the food can be optimally heated by a simple operation.

[Brief description of the drawings]

FIG. 1 is a front partial cross-sectional view of a high-frequency heating device with a heater according to an embodiment of the present invention.

FIG. 2 is a top view of the upper sheathed heater of the high-frequency heating device with the heater.

FIG. 3 is a top view of a lower sheathed heater of the high-frequency heating device with the heater.

FIG. 4 is a time chart of a preheating operation of the high-frequency heating device with the heater.

FIG. 5 is a block diagram of the high-frequency heating device with the heater.

FIG. 6 is a configuration diagram of a planar heater of a conventional high-frequency heating device with a heater.

[Explanation of symbols]

 Reference Signs List 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 15 temperature detecting means 16 operating unit 17 control unit 18 storage unit 19 magnetron

Claims (7)

[Claims] A heating chamber for accommodating food, a waveguide for guiding microwaves generated by a magnetron above the heating chamber, and a rotating antenna for radiating the microwaves to the heating chamber;
A hot plate heater having an upper heater for radiantly heating the food and a lower heater for the food in a conduction heating system, and having the heat block having a large heat capacity and two sheathed heaters embedded therein as the lower heater. A high-frequency heating device equipped with a heater. 2. The high-frequency heating apparatus with a heater according to claim 1, wherein the two sheathed heaters embedded in the hot plate heater are similar in shape, and the heat generating portions of the sheathed heater are embedded in contact with each other. 3. The high-frequency heating apparatus with a heater according to claim 1, wherein the two sheathed heaters embedded in the hot plate heater can be independently controlled, and are simultaneously energized at the time of starting preheating. . 4. The high-frequency heating apparatus with a heater according to claim 1, wherein the object-to-be-heated surface of the hot plate heater is exposed at the bottom of the heating chamber and forms a part or the whole of the bottom of the heating chamber. . 5. A heat block surface temperature at a substantially central portion of a hot plate heater opposite to a surface on which an object to be heated is placed is measured by temperature detecting means, and the temperature of the portion is set to a preset temperature. The high-frequency heating device with a heater according to claim 1, wherein the intermittent control of the heater is performed. 6. The energization for preheating 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 is performed according to a pattern stored in the control unit in advance.
After reaching the temperature A after the final preheating start signal or the final door opening or closing signal is input, the temperature is controlled to be maintained at the temperature A for a predetermined time, and thereafter, the temperature B lower than the temperature A is changed from A to The high-frequency heating apparatus with a heater according to claim 1, wherein the apparatus is controlled so as to maintain a predetermined time including a transition time to B. 7. An operation unit for inputting a heating code, a storage unit for storing heating conditions, and a control unit, wherein the control unit operates the storage unit based on the heating code input from the operation unit. 2. The high frequency heating apparatus with a heater according to claim 1, wherein the heating is performed by searching, calling a heating method corresponding to the code, and controlling the upper and lower heaters and the magnetron in accordance with the retrieved method.