JPH07260160A - Heating cooker - Google Patents

Abstract

PURPOSE:To partly heat a control relay, etc., in the case of thawing without damage. CONSTITUTION:A heating cooker thaws to cook by an operation of a magnetron 3, and comprises thawing control means 1 for operating the magnetron 3 with full power in a first step and so operating the magnetron 3 as to shorten an ON-OFF period shorter toward its later step.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to improvement of the defrosting operation of a heating cooker.

[0002]

2. Description of the Related Art A conventional defrosting operation in a heating cooker is performed, for example, as shown in FIG. 4, when the magnetron is fully powered at time T. When performing the defrosting operation only in full power operation as described above, for example, when ice on the surface portion of frozen food is melted into water, microwaves are intensively absorbed in the water portion, and only that portion has high temperature. There will be a problem of boiling.

Therefore, as shown in FIG. 5, the magnetron is operated at full power up to midway (T ₁ hour) and then turned on and off (T ₂ hour) to perform the partial heating. Avoiding that is also done.
That is, when the magnetron is turned on and off, the power is reduced and the surface is less likely to be thawed.

In this case, heat conduction from the surface is effectively used for thawing the inside of the food.

[0005]

In the above ON-OFF operation, it is effective to avoid partial heating by shortening the ON time as much as possible and delaying the thawing of the surface.
If the OFF cycle is shortened too much, the problem of shortening the contact life of the ON-OFF control relay occurs.

The present invention has been made in view of the above circumstances, and an object thereof is to enable partial heating during thawing without damaging a control relay or the like.

[0007]

And, in the present invention,
In a heating cooker that performs defrosting cooking by operating a magnetron, the magnetron is operated with full power in a first step, and in a plurality of steps after the second step, the ON-OFF cycle becomes shorter as it goes to a later step. Thus, the structure is provided with a thawing control means for operating the magnetron.

[0008]

According to the present invention, the ON time of the magnetron can be shortened as a whole, so that partial heating of food can be effectively avoided, and the number of times the ON-OFF control relay is activated is increased to the minimum in the subsequent steps. R.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a simplified diagram showing the construction of a heating cooker according to the present invention.

Reference numeral 1 is a control unit as decompression control means,
An operation unit 2 and a magnetron 3 are connected to the control unit 1.

The defrosting operation of this heating cooker will be described with reference to FIG. The defrosting operation is performed in the first step (T ₁ ) and the second step.
The process (T ₂ ) and the third process (T ₃ ) are performed.

The magnetron 3 is operated at full power in the first step, the first ON-OFF cycle (duty ratio 40%) in the second step, and the second step in the third step. ON / OFF cycle (duty ratio 25%).

FIG. 3 shows the change in the surface temperature of the food product accompanying the above-mentioned thawing process. The surface temperature of the food product becomes O degrees C by moving to the second process and the third process, that is, the surface is It becomes delayed to become water. In this way, the thawing proceeds while the surface is less likely to become water, so that the partial heating of the surface is avoided, and the ON-OFF cycle is shortened only in the third stroke. The number of activations of the OFF control relay is increased to a minimum. Even if the surface temperature does not rise as described above, thawing inside the food will not be possible with O of Magnetron 3.
The thawing time is not so long because it is performed by the penetration of microwaves at N hours and the heat conduction from the surface.

In the above embodiment, the thawing process consists of three steps, but it may be four or more steps.

[0015]

According to the present invention, the magnetron O
Since the N time can be shortened as a whole, partial heating of food is effectively avoided, and the number of times the ON-OFF control relay is activated is increased to a minimum in the subsequent steps, which makes it possible to control partial heating during thawing. You will be able to do it without damaging it.

[Brief description of drawings]

FIG. 1 is a simplified block diagram of a heating cooker according to the present invention.

FIG. 2 is an operation explanatory view of the heating cooker of the present invention.

FIG. 3 is a temperature change diagram of a food surface when the heating cooker according to the present invention is in operation.

FIG. 4 is an operation explanatory diagram of a conventional heating cooker.

FIG. 5 is an operation explanatory view of another conventional cooking device.

[Explanation of symbols]

 1 Control unit (defrosting control means) 3 Magnetron

Claims (1)

[Claims] 1. A heating cooker for performing defrosting cooking by operating a magnetron, wherein the magnetron is operated by full power in a first step, and the plurality of steps after the second step are turned on in later steps. -OF
A heating cooker provided with a defrosting control means for operating the magnetron so that the F cycle becomes shorter.