JP2002031349A - High frequency heating device with heater - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To improve the cooking performance of a high-frequency heating device with a heater, shorten the cooking time by enabling simultaneous heating of the microwave and the heater under the limitation of the power supply capacity. The purpose is to improve the finish of cooking. SOLUTION: A heat block 1 having a large heat capacity made of aluminum or an aluminum alloy is provided to a bottom heater of a heating chamber 6.
3 is a hot plate heater in which two sheathed heaters 14a and 14b are embedded.
a, 14b is energized, heat is stored in the heat block 13 at a high speed, and the heat storage energy and one heater are used for food heating during cooking, so that the simultaneous heating of the heater and the microwave can be performed under the limitation of the power supply capacity. Can be realized,
Cooking can be performed at a high speed as much as possible, and the heat generated by the two sheathed heaters 14a and 14b can be efficiently transmitted and diffused to the heat block, so that uneven grilling hardly occurs.

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. 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 of the breaker capacity of a general household widely used is 100 V, 15 A and about 1400 W is the practical upper limit, 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 In order to solve the above problems, a high frequency heating apparatus equipped with a heater has a structure in which a sheath heater is embedded in a heat block having a large heat capacity, and is embedded in a hot plate heater. The two sheathed heaters were formed in a similar shape, and the heat generating portions of the two sheathed heaters were embedded in the heat block so as to be in contact with each other. Therefore, the heat generated by the sheathed heater is efficiently transmitted and diffused to the heat block, and uneven baking is unlikely to occur. Also, the two heaters function as one heater that can switch the output in two stages,
There is almost no difference in the heat distribution when using the book and when using two at the same time.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 is a heating chamber for storing food, a waveguide for guiding microwaves generated by a magnetron above the heating chamber, and radiating the microwaves to the heating chamber. A rotating antenna, an upper heater for radiantly heating the food, and a lower heater for conduction heating the food, wherein the lower heater has a heat block having a large heat capacity and two sheathed heaters embedded therein. A high-frequency heating device with a heater is characterized in that a plate heater is used, and the two sheathed heaters are similar in shape and the heat generating portions of the sheathed heater are embedded in contact with each other.

Thus, the heat generated by the sheathed heater is efficiently transmitted and diffused to the heat block due to the good heat transfer property of aluminum, so that uneven baking is less likely to occur.

Further, the two heaters function as a single heater whose output 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 simultaneously. .

[0014]

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 sheathed 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 a 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 device 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.

[0021]

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.

Further, two sheathed heaters embedded in the hot plate heater are formed in a similar shape, and the two 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. 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.

[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 (1)

[Claims] 1. A heating chamber for storing food, a waveguide for guiding microwaves generated by a magnetron above the heating chamber,
A rotating antenna that radiates the microwaves to the heating chamber, an upper heater that radiates and heats the food, and a lower heater that conducts the food by conduction heating. While using a hot plate heater with a configuration in which the sheathed heater is embedded,
A high-frequency heating apparatus with a heater, wherein the two sheathed heaters are similar in shape and the heat generating portions of the sheathed heater are embedded in contact with each other.