JPS6032771B2 - heating cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a so-called hot air circulation type heating cooker that increases the temperature inside a heating chamber using hot air, and its purpose is to provide an efficient heating cooker with good cooking performance. It is on offer.

Recently, electric ovens, gas ovens, etc. equipped with high-frequency heating devices have been commercialized based on the idea that circulating the air within the heating chamber will equalize the heat distribution within the heating chamber. However, after testing various commercially available products, it became clear that the above idea had made a big mistake. That is, in the case of the hot air circulation method, the parts of the object to be heated that are hit by the hot air are strongly scorched, and the parts that are not hit by the hot air are hardly scorched. An electric opener equipped with a high-frequency heating device, which has recently been released, will be described as an example with reference to FIGS. 5 and 6. FIG. 5 is a top view, and FIG. 6 is a front sectional view, in which a heating chamber 2 is formed within the main body 1.

On the bottom wall of the heating chamber 2, a rotary table 4 supported by rollers 3 is rotationally driven by a motor 6 via a transmission shaft 5, and an object to be heated 7 placed on the rotary layer table 4 is rotated. .
An air duct 10 that communicates with the heating chamber 2, an intake square 8, and an outlet 9 is installed on the upper wall outside the heating chamber, and a fan 11 and a heater 12 for circulating air in the air duct 10 are installed. Therefore, when the fan 11 is rotated by another driving source, the air in the heating chamber 2 and the air duct 10 circulates as shown by the arrow, and the object to be heated 7 is heated by the hot air from the heater 12.
In this case, the object to be heated 7 is rotating, so if the hot air is blown uniformly over the surface, the surface will be heated evenly and browned, but the back side of the object to be heated 7 will not be browned because the hot air does not hit it. was there. Also, when looking at high-frequency heating, since the air duct 10 is installed at the center of the upper wall outside the heating chamber, the waveguide 13, the power supply port I4, etc. are located at the periphery of the upper wall of the heating chamber.
The electric field temperature in the center of the heating chamber has become weaker, and the rotating
The problem is that the so-called donut phenomenon tends to occur, which is non-uniformity between the center and the periphery. Note that 15 is a magnetron that generates high frequency waves. The present invention relates to a completely new heating device that eliminates the above-mentioned drawbacks, and one embodiment in which the present invention is implemented in a high-frequency heating device with a heater will be described below with reference to FIGS. 1 to 4.

There is a heating chamber 2 in the main body 1 for cooking food.

A door 3 is attached to the front opening of the heating chamber 2 so as to be openable and closable. A power supply port 4 is formed on the upper wall of the heating chamber 2 and is connected to a magnetron 5, which is a high frequency generator, through a waveguide 6, and radiates high frequency waves into the heating chamber 2. The power supply port 4 is covered with a cover 7 made of a dielectric material to prevent food particles, water vapor, etc. from entering the waveguide 6. A magnet-driven rotary teaching table 8 is attached to the bottom wall of the heating chamber 2, and a saucer is placed on top of this rotating teaching table 8.

In other words, a magnet AIO is attached to the lower part of the rotary calendar table 8, and when the pulley AII attached to the bottom wall outside the heating chamber rotates, the magnet B12 attached to the pulley AI I rotates, and the magnet AIO is attracted to the magnet B12. The rotary calendar table 8 supported by the rollers 3 rotates. The bottom wall of the heating chamber and the metal plate 14 to which the magnet is attached are made of SUS304 and a non-magnetic metal plate such as aluminum, so that magnetism can pass therethrough. Next, a corner chamber 16 is provided on the rear wall outside the heating chamber with a diaphragm plate 15, and the compartment 16 is equipped with a heater 17 that increases the temperature inside the heating chamber 2, and the air inside the heating chamber 2 and the compartment 16 is circulated. A fan 18 is installed to cause this. The rear wall 19 of the heating chamber is provided with an inlet 20 corresponding to the center of the fan 18, and air outlets 21 are provided on the left, right, upper and lower sides, so that when the fan 18 rotates, air circulates as shown by the arrows in FIG. That is, the air in the heating chamber 2 enters the compartment 16 through the outlet 20, and the air that enters the compartment 16 is heated by the heater 17 and becomes hot air, which is blown out into the heating chamber 2 through the outlet 21 and heated. The object to be heated 2 is sent to the saucer 9 which is rotating in the chamber 2.
Cook 2. As shown in FIG. 3, the saucer 9 is made up of a food calendar table 23 made of a metal plate and a support plate 24 made of a metal plate. Since they are connected by legs 25 formed of rods, the hot air blown out from the air outlet 21 below the food grade table 23 passes around the lower part of the food grade table 23 and reaches the air outlet 20.
The food counterfeit table 23 is heated evenly and uniformly, and the food to be heated can be browned. Further, when the ambient temperature in the heating chamber 2 exceeds a certain level, the temperature detecting device 26 attached to the compartment side of the air outlet 21 controls the electric power entering the heater 17 to maintain the temperature in the heating chamber constant. Next, a method of driving the rotation of the rotating Dungeon table 8 and the circulation fan 18 will be explained.

These are driven by one motor, and a pulley B28 attached to this motor shaft 27 and made integrally.
One of them drives the circulation fan 18 via a belt A31 to a pulley C30 attached to a shaft 29 of the circulation fan 18, and the other drives a pulley D34 attached to a worm gear 32 via a belt B32, and the other drives a pulley D34 attached to a worm gear 32 via a belt B32. The rotary platform 8 is driven by rotating a pulley AII from a pulley E35 mounted on the output track of 33 via a belt C36. The magnetron 5 is cooled by a fan motor 37, and the cooled air passes through an air guide 38 and an exhaust guide 39 to exhaust steam generated in the heating chamber during high frequency operation. Next, the heat insulating plate installed adjacent to the heating chamber wall will be explained.

On the upper wall of the heating chamber, two heat insulating plates 40 are attached with their corners separated for a certain distance, and the upper heat insulating plate extends to the top of the waveguide. On the rear wall of the heating chamber, a heat insulating board B41 is attached to the rear of the diaphragm plate 15 that forms the compartment 16, and this heat insulating board B41 has a bearing 42 that supports the circulation fan shaft 28, and a bearing mounting plate 43.
is respected. On the side wall of the heating chamber, a heat insulating plate 44 is made with a long lower part bent into a substantially L-shape, while keeping a constant distance from the side wall of the heating chamber, and is attached so that the lowermost part is in contact with the bottom wall of the heating chamber. As mentioned above, the following effects can be expected by blowing hot air from the side between the tray consisting of the food tray and the support plate.

'1' The heated part receives hot air in the horizontal direction, and the hot air also circulates around the bottom surface of the food rack on which the object to be heated is placed, so it is not only exposed to the top surface of the object to be heated, but also from the side and bottom surfaces. It can also be cooked and browned.

Moreover, since the object to be heated is rotating, it receives heat from all directions every time it rotates, so it is heated and cooked evenly.
■ The food counter, support plate, and legs are made of iron plates, which are then treated with a enamel to prevent rust. However, these have a heat capacity of 4 mm compared to glass pottery, etc., so the rise in temperature in the heating chamber is The cooking time is faster, the efficiency is better, and especially when cooking in batches, the temperature rises faster in the center, resulting in uniform cooking between the center and the periphery.

'3} When an iron plate is treated with a hollow finish, even if it is placed on a rotating metal platform and high-frequency cooking is performed, there will be no electrical discharge and no local heating will occur.

Therefore, since it can be used for both high-frequency heating and heater heating, there is no need to change the saucer for each cooking, making it easy to use and extremely economical. Moreover, iron plates are cheaper than glass pottery and require no storage space. '4} When the door opens from the front, if the height when the door is open, the height of the bottom wall of the heating chamber, and the height of the rotary teaching table are made equal, you can enter and exit by holding the flange of the food placing table, making it easier to use. In addition, since the support plate is disk-shaped, the object to be heated can be stably placed on the support plate.

{5) The disk-shaped support plate has the effect of short-circuiting and weakening the strong electric field (short ring effect), and no sparks are generated by the electric field.

'6) By stacking the food rack tables in two tiers, you can cook in two tiers, allowing you to cook more food at once.

Note that even when the saucer 9 is placed at a corner of the heating chamber as shown in FIG. Since it rotates even when placed on the floor, the object to be heated does not move or fall over, making it extremely convenient to use.

[Brief explanation of the drawing]

FIG. 1 is a top sectional view of a heating cooker showing an embodiment of the present invention, FIG. 2 is a front view of the same, and FIG. 3 is a perspective view of the main part of the saucer.
Figure 4 is a diagram explaining the dimensional relationship between the rotating teaching table and the saucer.
FIG. 5 is a top view of a conventional cooking device, and FIG. 6 is a front sectional view thereof. 1. ．． ．． Main body, 2... Heating chamber, 5... Magnetron, 6... Waveguide, 8... Rotating calendar table, 9... Saucer, 16... Compartment, 17... Heater , 18... Fan, 19... Heating chamber rear wall, 23... Food calendar, 2
4...Support plate. Figure 2 Figure 1 Figure 3 Figure 4 Figure 5 Figure 6

Claims (1)

[Scope of Claims] 1. A heating chamber in which an object to be heated is stored and cooked within a main body, a compartment adjacent to the side wall or back wall of the heating chamber, a heater provided in this compartment, the heating chamber, and the compartment. a fan device for circulating air, a rotary mounting table and a saucer for rotating the object to be heated on the bottom wall of the heating chamber, and a hot air outlet provided on the side wall or back wall of the heating chamber on both sides of the wall The tray is provided in the vertical direction and has a downward outlet at a position corresponding to the space through which the hot air passes. What is claimed is: 1. A heating cooker comprising: a disk-shaped support plate that can make surface contact with the food product; and a space through which hot air passes is provided between the food placement table and the support plate. 2. The cooking device according to claim 1, wherein the support plate is placed on the rotary mounting table even when the saucer is placed at a corner of the heating chamber.