JP2574479B2 - Microwave cooking equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an apparatus for irradiating food materials with artificial microwaves of 2,450 MHz (± 50 MHz), heating and cooking, and in particular, relates to the apparatus. It is applied to a large cooking device for business use.

[Conventional technology]

This type of device is widely used as a so-called microwave oven.

However, conventional microwave ovens are small for home use, and large ones for business use have not been put to practical use.

Even in the case of using a microwave oven for business use, it is a fact that many small ones of about 1 to 2 kilowatts are used side by side.

The reason why the development of a large microwave oven is desired but not realized is that a large amount of the object to be heated (food material) cannot be heated uniformly, resulting in uneven heating.

Theoretical elucidation and experimental research on uneven heating in microwave ovens are discussed in Nippon Kogyo Shimbun's "Microwave Oven, Microwave, Food Use Handbook" by Atsuko Higo, pages 22-32, March 1987. .

The largest reason that a large-sized microwave cooking device cannot be put to practical use due to uneven heating is that microwaves incident on the object to be heated attenuate relatively quickly and do not reach a deep part.

Since the state of attenuation greatly varies depending on various conditions, it cannot be said unconditionally. However, according to the above-mentioned known literature, a report has been introduced that, for example, the microwave half-depth in the case of beef is about 0.8 to 1.5 cm.

When the object to be heated is a liquid having a low viscosity, soaking by convection can be used, but soaking of food by general convection cannot be expected.

In the past, technologies developed to prevent uneven heating in small microwave cookers were to mix air and oil into the workpiece, devise the shape and size of the container, and to use extra Blocking radio waves,
And interrupting the heating and stirring manually.

[Problems to be solved by the invention]

A difficulty in commercializing a large-scale microwave cooking device for business use is the problem of uneven heating.

A possible solution to this problem is to provide a stirring device.

For example, large meat chunks and the like cannot be stirred, but if it is a normal cooked product, it can be heated by stirring.

Nevertheless, the reason that the microwave cooking device having the stirring function cannot be put to practical use until today is due to the following technical difficulties.

a. Microwave cookers must be placed in a metal heating cabinet and shielded so as not to injure the human body.

For this reason, it is not easy to provide a stirring device in the heating container and to provide a transmission system for rotating the stirring device without disturbing the operation of taking food material in and out of the shielded heating container.

b.If the metal members are in contact with or close to each other,
In the meantime, a spark discharge occurs. For this reason, a machine element (for example, a shaft and a bearing metal, a bolt and a nut, etc.) in which the metal members are in contact cannot be used.

The present invention has been made in view of the above circumstances, has no risk of causing microwave leakage that is harmful to the human body, facilitates the operation of taking in and out the food material in the heating vessel, and automatically automates the food material to be heated. It is an object of the present invention to provide a microwave cooking apparatus (in other words, a large-scale microwave oven for business use) which can be stirred stably and does not generate spark discharge by microwaves.

[Means for solving the problem]

In order to achieve the above object, the apparatus of the present invention is provided with a microwave device that radiates microwaves in an upper part of a heating chamber surrounded by a metal plate, and puts an object to be heated in the heating chamber. In a microwave cooking apparatus provided with a heating container, the heating container is integrally formed of a metal material, and is connected to the heating chamber via a non-metallic bush by a pair of shafts arranged along a horizontal axis. Is instructed to be tiltable, and is separated from other metal members by 2 mm or more, and one of the pair of shafts has a cylindrical portion, and the pair of shafts has a cylindrical shape. A stirring blade having a pair of shafts at both ends is disposed in the heating container, and one of the pair of shafts penetrates the cylindrical shaft and protrudes outside the heating chamber; A conductive member for rotational drive is attached to the part protruding outside the refrigerator, and Portion where the stirring blade is positioned within the heating chamber is characterized by being composed of a non-metallic material.

The interval (distance between metal members) required to prevent spark discharge varies depending on various operating conditions, particularly the output of the microwave device. The inventor has experimentally confirmed that the required interval under the worst condition that can occur at the minimum value (500 W) of the wattage range having practical value to which the present invention is applied is 2 mm.

In the present invention, being integrally formed of a metal material means that the connection is performed in a state where there is no contact electric resistance, or in a state where the contact electric resistance is small enough to be practically regarded as zero. However, bolting and riveting are not applicable.

(Operation)

According to the above configuration, since the axis of the heating vessel and the axis of the stirring blade are arranged concentrically and project outside the heating chamber, without obstructing the microwave shielding function of the heating chamber,
The tilting operation of the heating vessel and the rotational drive of the stirring blade are possible.

And since the heating container can be tilted, the operation of taking in and out the contents is easy.

Further, of the stirring blade, a portion that may be exposed to microwaves is made of a non-metallic member, and the heating vessel is integrally formed of a metal material, and is 2 mm without contacting other metal members. Since it is farther away, spark discharge due to microwaves does not occur.

〔Example〕

FIG. 1 is a sectional view showing one embodiment of a microwave cooking device according to the present invention.

A microwave device 2 is installed in an upper part of a heating chamber 1 made of a metal plate, and emits microwaves downward.

A metal heating vessel 3 is provided in the heating chamber 1.

The heating vessel 3 has an operation axis 3 _a along the horizontal axis HH.
And the cylindrical shaft _3b are integrally formed.

The operation shaft 3 _a is inserted into the through anchored Teflon bushing 4 _a in the heating chamber 1, the handle 3 _c is attached to the distal end.

The tubular shaft 3 _b is fitted through a teflon bushing 4 _b and is rotatably supported by the through anchored metallic cylindrical bearing 5 in the heating chamber 1. Thus, the heating container 3 is separated from the heating chamber 1 by 2 mm or more. Three
_d is a peeping window described later with reference to FIG.

Reference numeral 6 denotes a stirring blade arranged in the heating vessel 3, and a portion located in the heating chamber 1 is made of a nonmetallic material.

In this example, ceramics was used as the nonmetallic material, but an appropriate material such as a reinforced plastic containing glass fiber can be arbitrarily selected and used.

The stirring blade 6 has a support shaft _6b and a drive shaft _6c connected to both ends of _a crank arm 6a.

Support shaft 6 _b of the is rotatably fitted into the cylindrical portion 3 _a-1 formed in the operation shaft 3 _a as described above.

On the other hand, the drive shaft _6c is inserted through the above-described cylindrical bearing 5 and protrudes out of the heating chamber 1, and a pulley 9 for rotational driving is fixed to the end thereof. Thus, the stirring blade 6 can be driven to rotate via the pulley 9.

Since the heating container 3 is integrally formed of a metal material and is separated by 2 mm or more without contacting other metallic members, there is no possibility that a spark discharge is generated even when receiving the microwave.

Also, since the stirring blade 6 is made of a non-metallic material,
There is no risk of spark discharge even when receiving microwaves.

The above-mentioned heating chamber 1, microwave device 2, and heating container 3
FIG. 2 shows the AA cross section.

A door 10 is attached so as to be openable and closable, covering an opening provided on a side surface of the heating cabinet 1. The door 10 is provided with _a window 10a and a cover _10b having a microwave shielding function.

In opposition to the window 10 above the window 3 _d provided in the heating container 3, is mounted a transparent cover 3 _e having heat resistance.

Tilting the heating vessel 3 by turning the handle 3 _c shown in FIG. 1, becomes as the 3 'drawn in phantom in Figure 2, which is convenient for loading and unloading the contents.

〔The invention's effect〕

As described above, according to the microwave cooking device of the present invention, there is no possibility of causing microwave leakage that is harmful to the human body, the food material can be easily taken in and out of the heating container, and the food material to be heated can be obtained. It has an excellent practical effect that it can automatically agitate and does not generate spark discharges due to microwaves, greatly contributing to the practical use of large microwave cooking devices for business use.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of a microwave cooking device according to the present invention. FIG. 2 is a sectional view taken along the line AA of the heating container, the microwave device, and the heating cabinet in the above embodiment. 1 ... heating chamber, 2 ... microwave device, 3 ... heating vessel, 3 _a ... operating shaft, 3 _a-1 ... cylindrical part, 3 _b ... cylindrical shaft, 3 _c
… Handle, 3 _d … Window, 4 _{a a} , 4 _b … Teflon bush, 5… cylindrical bearing, 6… stirring blade, 6 _a … crank arm, 6 _b … support shaft, 6 _c … Drive shaft, 9… Pulley.

Claims (1)

(57) [Claims] 1. A microwave cooking apparatus in which a microwave device for radiating microwaves is installed in an upper part of a heating chamber surrounded by a metal plate, and a heating container for putting an object to be heated is installed in the heating chamber. In the above, the heating container is integrally formed of a metal material, and is supported by a pair of shafts arranged along a horizontal axis so as to be tiltable with respect to the heating chamber via a non-metallic bush,
And, apart from the other metal member by 2 mm or more, one of the pair of shafts has a cylindrical portion, the pair of shafts is cylindrical, in the heating vessel, A stirring blade having a pair of shafts at both ends is disposed, and one of the pair of shafts penetrates through the cylindrical shaft and protrudes out of the heating chamber, and rotates in a portion protruding out of the heating chamber. A microwave cooking device to which a driving conductive member is attached and a portion where the stirring blade is located in the heating chamber is made of a nonmetallic material.