JPS5931034Y2 - microwave heating device - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a microwave heating device, and particularly aims to heat an object to be heated to a desired state, in which each part of the object has different heating characteristics.

Conventionally, when heated items such as packed lunches have different heating characteristics in different parts of the heated item, the temperature of the cooked rice and side foods differs from each other in terms of dielectric power factor, specific heat, etc. when heated by microwaves, so the temperature of the two items rises at different rates. Therefore, even if one of the two reaches the sterilizing function temperature (70°C) or higher, the other will not be able to reach the sterilizing function temperature, and by the time the other reaches the sterilizing function temperature, one will already have undesired charring. There was an inconvenience that this could occur.

This invention was developed in view of this point, and one embodiment will be explained below.

1 is a heating chamber; 2, 3... are magnetrons fixed to the upper wall 4 of the heating chamber with their antennas 2a, 3a... facing the heating chamber 1; 5 is a heating chamber population Conveyor belt 9 conveys the objects 8 to be heated from 6 to the heating nitriding lower, 9... is the object 8 to be heated 8...
The position of the heated object 8 is regulated as will be described later.
. This is a radio wave shielding partition plate formed by forming a plurality of .13.

The partition plate 10 and the partition plate 11 are fixed to the heating chamber upper wall 4 and the heating chamber bottom wall 14, and the partition plate 10 and the partition plate 11 are fixed to the heating chamber upper wall 4 and the heating chamber bottom wall 14, and are
A gap 15 is formed through which the object to be heated 8 located at the boundary between the two is inserted.

The object to be heated 8 has different temperature rise characteristics in each part of the object to be heated, and specifically, it is a packed lunch 8.

This packaged lunch box 8 is made up of a radio wave transparent outer box 16 containing pre-cooked rice 17 and side food 18.

Moreover, the cooked rice 17 and the side food 18 have different compositions and differ in terms of dielectric power factor, specific heat, etc., so if they are placed in the same microwave area, one of them will be overheated or underheated.

Magnetron 2... and magnetron 3...
... are arranged in areas 12 and 13, and high voltage is applied from a high voltage generation circuit (not shown) to generate high frequency oscillation.

Further, the magnetrons 2, 3, . . . have the same output power, and only three magnetrons are arranged in the area 12, and five magnetrons are arranged in the area 13.

Therefore, zone 13 has a higher heating power than zone 12.

In the packaged lunch box 8, the cooked rice portion 17', which has a large amount of food, is the high output area 13.
The side food section 18', which faces the
It is placed on the belt conveyor 5 in a state facing the front.

Therefore, a large amount of microwave energy is absorbed in the cooked rice portion 17', which has a large amount of food, corresponding to the amount of cooked rice, and only a small amount of microwave energy, corresponding to the amount of side food, is absorbed into the side food portion 18', which has a small amount of food. It is not absorbed, so the cooked rice part 17'
The temperature of the auxiliary food portion 18' and the side food portion 18' rise uniformly.

In this embodiment, the microwave outputs of the corresponding areas 13 and 12 are adjusted in consideration of various conditions such as the quantity of each of the cooked rice portion 17' and the side food portion 18', dielectric power factor, and specific heat.

Adjustment of the microwave output in the areas 12 and 13 is performed by increasing the number of magnetrons 2, 3, and so on.

Since this invention is configured as described above, it is possible to uniformly raise the temperature of each part of the object to be heated, even though each part of the object to be heated has different temperature rise characteristics.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of this invention, Fig. 2 is a sectional view of the embodiment as seen from the front, Fig. 3 is a sectional view of a part of the embodiment, and Fig. 4 is a heated object. FIG. 1... Heating chamber, 8... Heated object, 10
．． 11...Radio wave transparent partition plate, 12.13...
... area, 17', 18'... each part of the object to be heated.

Claims (1)

[Scope of utility model registration request] The heating chamber is partitioned with a radio wave shielding partition plate to form a plurality of microwave-independent areas, and each part of the object to be heated has a different temperature rise characteristic as desired for each part of the object to be heated. A microwave heating device characterized by comprising means for placing the heating chamber in a state facing the area.