JP3109312B2 - Heating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to shortening of cooking time in a heating device.

[0002]

2. Description of the Related Art In a heating cooker described in Japanese Patent Application Laid-Open No. Sho 59-1667933, a food 2 is accommodated in a heating chamber 1 and a high-frequency heating source 3 is connected to the heating chamber 1 as shown in FIG. Have been.

A sub-heating chamber 5 partitioned by a perforated plate 4 is provided on the rear surface of the heating chamber 1, and an electric heating device 6 and a circulation fan 7 for circulating hot air into the heating chamber 1 are provided in the sub-heating chamber 5. Have been.

The high-frequency heating source 3 and the electric heating device 6 are supplied with power substantially simultaneously. With such a configuration, the property of heating the food from the inside of the high-frequency heating and the property of scorching the surface of the food by the hot air of the electric heating work effectively, and the quality can be improved.

[0005]

However, in the above configuration, the food does not burn unless the temperature in the heating chamber 1 rises to the temperature at which the food burns. Heating the entire heating chamber 1 to a predetermined temperature requires heat dissipation and the like, and it takes time. Therefore, even if the internal temperature of the food is raised in a short time by a high-frequency heating source, it is difficult for the food to be browned and the cooking time is long. There is a disadvantage that.

Further, the power consumption of the entire heating device is limited, and if much power is supplied to the electric heating device 6 while increasing the temperature inside the heating chamber 1 is emphasized, sufficient power cannot be supplied to the high frequency heating source 3. However, there is a disadvantage that the temperature inside the food rises slowly and the cooking time is long.

Accordingly, the present invention provides a method of heating by an electric heating device,
An object of the present invention is to provide a heating device in which the heating by a high-frequency heating source is effectively utilized and cooking time is shortened and cooking is completed.

[0008]

In order to solve the above problems, a heating apparatus according to the present invention comprises a heating key for instructing the kind of an object to be heated and a plurality of heating keys having different radiation intensities and radiation distributions of generated infrared rays. The configuration includes a heating element, a high-frequency heating source, a plurality of heating elements, and a control unit that controls switching of power supply to the high-frequency heating source.

[0009]

According to the heating device of the present invention,
Depending on the type of the object to be heated specified by the heating key,
The control unit can be changed freely and the conduction ratio of the plurality of heating elements, by changing the energizing ratio of the plurality of heating elements and high-frequency heating source infrared radiation intensity and radiation distribution and high-frequency output,
Rather than the ambient temperature, the food is scorched in a short time by radiant heat which is optimal for the food, and the internal temperature can be raised in a short time by the high frequency heating, so that the cooking time is shortened and the finish is improved.

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a heating apparatus according to an embodiment of the present invention.

FIG. 2 is a front perspective view of a heating apparatus according to an embodiment of the present invention. A door 9 is supported on the front surface of a main body 8 so as to be openable and closable, and a heating chamber 10 for accommodating an object to be heated. The opening is closed. On the operation panel 11, a heating key 12 for instructing a kind of an object to be heated, a category of heating, and the like is arranged.

FIG. 3 is a plan view of a main part of a heating device according to one embodiment of the present invention. A group of small holes 13 is formed in the center of the ceiling of the heating chamber 10, and a radiant heating element 14 is installed to face the small holes 13. The radiation type heating element 14 is formed of a hollow protective tube having a circular or elliptical cross section, and a heating wire surrounded by an insulating material having a good infrared transmittance, such as a quartz tube or a crystallized glass tube. .

A planar heating element 1 is formed around the ceiling of the heating chamber in an annular shape.
5 are arranged. As such a sheet heating element, for example, a sheet heater described in Japanese Patent Publication No. 4-54138 can be used. That is, the heating element is wound around a winding frame made of a heat-resistant insulating material such as mica, and the upper and lower portions thereof are similarly sandwiched between insulating materials such as mica and pressed against the ceiling of the heating chamber from outside. No through hole is formed in the ceiling wall surface facing the planar heater. A high-frequency heating source 16 is provided on a side surface of the heating chamber 10 and is coupled to the heating chamber 10.

FIG. 4 is a diagram showing the wavelength and radiation intensity of infrared rays emitted by the heating element group according to the present invention. The horizontal axis represents the infrared wavelength, the vertical axis represents the radiation intensity, and the relationship between the two is shown using the heater temperature as a parameter. Group A represents the characteristics of the radiant heating element in FIG. 3, and group B represents the characteristics of the planar heating element. The heater temperature is realized by intermittently supplying power to the heater and changing the power supply rate.
That is, the maximum temperature can be obtained by continuous energization, and the heater temperature decreases as the off-time increases.

FIGS. 5A and 5B are diagrams showing the heat distribution of such a heating element group in five levels of radiation intensity. FIG. 5A shows the heat distribution pattern of the radiation heating element, and FIG. Represents the distribution pattern. As shown in the figure, the radiation type heating element has a configuration in which strong radiation is concentrated at the center, and has a large difference from the surroundings. On the other hand, the maximum value of the sheet heating element is small, but gentle radiation is uniformly radiated to the whole.

The numerical values in the figure indicate the radiation level, and the higher the numerical value, the higher the radiation level. That is, level 5
Has the highest radiation intensity.

FIG. 1 is a block diagram showing an embodiment of the configuration of the present invention. The command input from the heating key 12 is decoded by the control unit 17. The control unit 17 can be constituted by a microcomputer, for example. Depending on the type of the object to be heated input from the heating key 12, the control unit 17
8, a radiation heating element 14 and a sheet heating element 15 arranged on one ceiling on the same plane of the heating chamber 10, a sheet heating element 19 arranged on the bottom of the heating chamber 10, and a high-frequency heating source The power supply is performed at a predetermined power supply ratio predetermined in step S16.

FIG. 7 is a time chart showing the energization of the three types of heating elements and the high-frequency heating source. That is,
(A) supplies power to the radiation heating element 14, (b) supplies power to the planar heating element 18 on the ceiling, (c) supplies power to the planar heating element 19 on the bottom face, and (d) supplies power to the planar heating element 19 on the bottom face. The power supply to the high frequency heating source 16 is shown. In this embodiment, each heating element has a rated voltage specification, and the power supply is switched one after another. The energization ratios T _A / T _B to the radiant heating element and the planar heating element on the ceiling,
Than it is varied according to T _D and heating keys commanded one period length T _o energization.

FIG. 6 is a diagram showing the relationship between the obtained infrared radiation intensity and the radiation distribution when two types of heating elements on the ceiling are energized by the above control. The horizontal axis represents the radiation intensity, and the vertical axis represents the distribution unevenness by the deviation σ. The deviation of the distribution unevenness is caused by the radiation of the object to be heated on a plurality of places, for example, 25 places.
It can be obtained by measuring over the point and applying the statistical processing to this radiation amount to obtain the variance. Naturally, the smaller the numerical value, the smaller the unevenness, and the larger the numerical value, the more severe the unevenness.

Point A is the infrared radiation intensity and radiation distribution obtained by a single radiation type heating element, and point B is the infrared radiation intensity and radiation distribution obtained by a single planar heating element. Point A is suitable, for example, for baking fish at once with high radiation, and point B is suitable for baking cakes, cookies, and other sweets in a uniform atmosphere with reduced radiation. The main ingredients of cakes and cookies are eggs, sugar, flour, oils and fats, which are much easier to brown than fish, so they can be browned even if radiation is suppressed.

It is preferable that the radiation of meat be suppressed more than that of fish, and if the radiation and the unevenness are not further reduced, the inside of the gratin cannot be burnt and the surface cannot be finished in a fine brown color unless the radiation and unevenness are reduced. When heating the food or the cooking category located between the points A and B in this way, the present invention performs alternating heating as shown in FIG. 7 and changes the energization ratio. By such control, the infrared radiation intensity and the radiation distribution can be freely selected, and heating according to the object to be heated can be performed.

FIG. 8 shows data obtained by actually measuring the process of increasing the temperature inside the food when the food is heated only by the heater (dotted line) and when the heater and the high-frequency heating are alternately heated (solid line). It can be seen that when the heater and the high-frequency heating source are switched alternately (solid line), the internal temperature rise is clearly faster, and a significant time reduction is possible. The high frequency output can be freely selected by changing T _D / T _o in the figure. As described above, the infrared radiation intensity, the radiation distribution can be optimally selected according to the ease of burning of the food, the optimal browning can be given in a short time, and the internal temperature can be increased in a short time by high frequency heating, Shorten cooking time,
The workmanship is improved.

In this embodiment, the planar heating elements on the bottom of the heating chamber are also configured to alternately supply power, similarly to the heating elements on the ceiling. However, the voltage specifications of the three heating elements are appropriately selected.
When the power supply voltage is 100V, if the three heaters are set to 50V, only the two types of heating elements on the ceiling can be powered alternately, and the planar heating elements on the bottom can be energized continuously except for the high-frequency heating time. It is.

Also, the driver 10 is a semiconductor switch capable of continuously controlling the current value, not the on / off control as in the relay of the present embodiment, and the duty ratio is changed instead of the on / off time. The same effect can be obtained even if it is performed.

[0025]

As is apparent from the above description, according to the present invention, a heating chamber for accommodating an object to be heated, a heating key for instructing the type of the object to be heated, and the like are provided on the same plane of the heating chamber. La
A plurality of heating elements having different radiation intensity and radiation distribution of the generated infrared light, a high-frequency heating source coupled to the heating chamber, and a control unit that controls power supply to the plurality of heating elements and switching control of the high-frequency heating source. The control unit may control the plurality of heating elements according to the type of the object to be heated, which is instructed by the heating key.
Each energization ratio of food to the optimum infrared radiation intensity with the configuration for changing the the power energization percentage is varied radiation intensity and radiation distribution and a high frequency output of the high frequency heating source and the plurality of heating elements, radiation distribution High-frequency output can be selected to shorten cooking time and improve workmanship.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of a heating device according to an embodiment of the present invention.

FIG. 2 is a front perspective view of the heating device.

FIG. 3 is a plan view of a heating element of the heating device.

FIG. 4 is a diagram showing the infrared wavelength and radiation intensity of the heating element.

FIG. 5 is a diagram showing a heat distribution on a mounting surface of the heating device.

FIG. 6 is a diagram showing infrared radiation intensity and radiation distribution deviation of a heating element of the heating device.

FIG. 7 is a time chart showing power supply to a heating element of the heating device.

FIG. 8 is a diagram showing the progress of an increase in internal temperature when heating is performed by the heating device.

FIG. 9 is a side sectional view showing a configuration of a cooking device in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Heating chamber 12 Heating key 14 (radiation type) heating element 15 (plane) heating element 16 High frequency heating source 17 Control part

Continuation of the front page (72) Inventor Shigeki Ueda 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-54-65849 (JP, A) , U)

Claims (1)

(57) [Claims] A heating chamber for accommodating an object to be heated, a heating key for instructing the kind of the object to be heated, etc., are provided on the same plane as the heating chamber.
And a plurality of heating elements having different radiation intensity and radiation distribution of the generated infrared light, a high-frequency heating source coupled to the heating chamber, and switching control between power supply to the plurality of heating elements and power supply to the high-frequency heating source. more become a control unit which, according to the type of the object to be heated which is commanded by the heating key, the control unit before
Serial plurality of each energization ratio of the heating element, the plurality of heat-generating body and the high-frequency heating source by changing the power energization percentage of radiation intensity and radiation distribution and heating device for changing the high frequency output.