JPH01256727A - Microwave oven - Google Patents

Abstract

PURPOSE:To perform suitable cooking operation, prevent faulty insulation and improve safety by a method wherein a fixing element and a magnetic sensitive element operated under a magnetic field from a permanent magnet penetrating a bottom surface of a heating chamber and for detecting a fixing or a removal of an agitating device are provided and the agitating vane is rotated at a high speed only when the agitating vane is installed. CONSTITUTION:A turn table 19 arranged within a heating chamber 1 and a transmission driving part 16 arranged below the heating chamber 1 perform a heating process while rotating a heated item 18 itself at a low speed of about 5 to 6rpm. An agitating container 12 and the transmission driving part 16 arranged below the heating chamber 1 are used while the agitating container 12 is kept still. The agitating vane 14 is rotated at a high speed of about 200rpm to enable the food raw material 13 to be agitated. A supporting table 42 fixed below the agitating container 12 can keep the agitating container 12 at a bottom surface of the heating chamber 1. A permanent magnet 67 fixed to the supporting table 42 and the magnetic sensitive element 68 arranged at an outer side of the heating chamber 1 are operated through a magnetic field from the permanent magnet 67. The agitating vane 14 is operated at a high speed only when this operation is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a high-frequency heating device having a food stirring function.

(Prior art) This type of high-frequency heating device that has a food stirring function is
This is proposed in Japanese Utility Model Application Publication No. 56-71489. In this configuration, a container is removably attached to a turntable that is rotatably provided in a heating chamber, and a stirring blade provided inside the container is removably attached to a fixed shaft that passes through the rotation axis of the turntable. It is.

(Problem to be solved by the invention) According to the above configuration, the stirring blade is stationary.

The container attached to the turntable itself rotates, so if you try to rotate it at high speed (relatively faster than a normal turntable).

The object to be heated will fly out due to inertia. Therefore, the rotation speed of the turntable during normal high-frequency heating is limited to 6 to 6 rpm, and there is a problem that sufficient stirring performance cannot be obtained.

(Means for Solving the Problems) The present invention has been made to solve the above problems, and uses a high-frequency oscillator as a heating source, and a turntable on which an object to be heated is placed and a stirring blade are rotatably provided. Either one of the built-in stirring vessels is selectively installed in the heating chamber, and a variable speed drive unit is provided below the heating chamber to drive either the low-speed rotation of the turntable or the high-speed rotation of the stirring blade. , a support for holding the stirring container on the bottom of the heating chamber is fixed to the bottom of the stirring container, and a fixture is provided for detachably fixing the support to the bottom of the heating chamber, the bottom of the heating chamber, The support base and fixture are formed from a non-magnetic metal body,
A permanent magnet is attached to the outer surface of the lower part of the support base, and a magnetic sensing element is installed that operates by the magnetic field from the permanent magnet that passes through the fixing device and the bottom of the heating chamber to detect attachment and detachment of the stirring container, and only when the stirring container is attached. The stirring blade rotates at high speed.

(Function) With the above configuration, the turntable provided inside the heating chamber and the variable speed drive section provided below the heating chamber perform heat treatment while rotating the object to be heated at a low speed of about 6 to 6 rpm. The stirring vessel installed inside the heating chamber and the variable speed drive section installed below the heating chamber allow the stirring vessel to be used in a stationary state.

Food raw materials can be stirred by rotating the stirring blade at a high speed of around 20 rpm. In addition, the support stand fixed to the bottom of the stirring vessel can hold the stirring vessel at the bottom of the heating chamber, and the permanent magnet attached to this support stand and the magnetic sensing element installed outside the heating chamber are attached to this permanent magnet. It is operated by a magnetic field from the turret, and only during this operation it has the effect of causing the stirring blade to rotate at high speed.

(Embodiment) FIG. 1 is a cross-sectional view of a main part of a high-frequency heating device according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of the main part.

Figure 3 is a top view of the fixture, Figure 4 is a cross-sectional view of the high-frequency heating device (for home bakeries), Figure 6 is a cross-sectional view of the same (for microwave ovens), and Figure 6 is a cross-sectional view of the same (for electric ovens). (for open use).

This example shows an example in which two food ingredients are bread ingredients, a stirring container is a bread container into which the bread ingredients are placed, and a stirring blade is a kneading blade for kneading the bread ingredients.

In the figure, 1 is a heating chamber provided within the high-frequency heating device. At least the bottom surface of the heating chamber 1 is made of a non-magnetic metal material 9, such as SUS 304.

Reference numeral 2 denotes a high frequency oscillator that supplies high frequency energy to the heating chamber 1 via a waveguide 3 for directly dielectrically heating the inside of the food. 4 is the upper heater, 6 is the lower heater for cake,
It is a heating source for browning during open cooking such as baking bread. Reference numeral 6 denotes a plate tray that supports square plates 7 (Fig. 6) used during open cooking. 8 is a door for opening and closing the front entrance of the heating chamber 1, and 9 is an operation panel for controlling heating. 10 is an outer box, and 11 is a leg attached to the lower surface of the outer box 1o. 12 is one food product, and in this example, it is flour.

Knead bread ingredients 13 consisting of yeast, water, etc.
This is a stirring container (bread container) that automatically stirs bread until it is baked using high-frequency heating and heater heating.

Reference numeral 14 denotes a stirring blade (kneading blade) rotatably provided in the lower part of the stirring container 12. 16 is a rotating shaft of the kneading blade 140.

In FIG. 1, reference numeral 16 denotes a table motor 22 that rotates a turntable 19 (FIG. 6) on which an object to be heated 18 is placed at a low speed of 5 to 6 rpm, and a table motor 22 that rotates a kneading blade 14 at a speed of 20 rpm when baking bread using the bread container 12. This is a variable speed drive unit whose driving source is a kneading motor 23 that rotates at high speed in the front and back. 17 is a small boob IJ-24. Belt 26. This is a first drive shaft that transmits power to the rotating shaft 16 of the kneading blade 14 via a large pulley 26. The first drive shaft 17 is made of 5US303, SUS
It is made of a metal cylinder made of highly hard stainless steel such as SUS 430 or SUS 420. A drive piece 17a made of aluminum or zinc cast material suitable for machining complicated shapes is press-fitted into the upper end of the first drive shaft 17. Only the outer periphery of the large pulley 26 is made of synthetic resin with good workability, and the other parts are made of a metal plate molded product 26a. 27 is a receiver A that receives the rotational force of the table motor 220 as shown in FIG. 29 is a bearing B for the rotating shaft 16
in.

This is sintered metal impregnated with lubricating oil. The second drive shaft 27 passes through a hollow portion of the first drive shaft 17. 31 is the table motor 22 and the kneading motor 2
This is a motor mounting base for attaching 3. Reference numeral 32 denotes an intake hole for taking in outside air into the motor mounting base 31 to cool electrical components. 33 is a nut for fixing the large pulley 26 to the first drive shaft 17. 33a
is a reinforcing plate that increases the contact area and prevents wobbling when the large pulley 26 is attached to the first drive shaft 17.

34 is a hollow disc that receives the thrust load of the drive piece 17a on the upper part of the first drive shaft 17. Reference numeral 36 denotes a support fitting 3 fixed to the rotating shaft 16 to prevent the rotating shaft 16 from coming off upward.
This is an oil seal made of rubber or the like and is attached to the lower part of e with a rivet 37 or the like. 42 is a support stand fixed to the lower part of the bread container 12 in order to hold the bread container 12 on the bottom surface inside the heating chamber 1. The support base 42 is die-cast from a non-magnetic metal body 2, such as aluminum or zinc. Reference numeral 43 denotes a rivet for fixing the support base 42 and the bread container 12. Note that the bearing B29 for the kneading blade 140 rotation shaft 16 is formed integrally with the support base 42 and the bearing holder 69. A bearing holder 69 protrudes from the bottom surface of the bread container 12, but an aluminum cap 39 coated with tetrafluoroethylene resin is attached to the bearing holder so that the upper outer surface of the protruding bearing holder 69 is not directly exposed inside the bread container 12. It is fixed to the top of 69. Reference numeral 44 denotes a fixture for removably fixing the support base 42 to the bottom of the heating chamber 1. It has a shape as shown in FIG. The hook formed on the fixture 44 for fixing is a portion that engages with the foot portion 42a of the support base 42. The above-mentioned hook passes through the gap between the support base 42 and the bottom of the heating chamber 1 by setting the gap P between adjacent parts 61 to 1/2 or less of the wavelength λ used, and passes through the through hole in the bottom of the heating chamber 1 to the outside. This is a cutoff for high frequencies that are about to leak.

Reference numeral 63 designates a small hole through which a set screw 64 is inserted, which brings the periphery of the fixture 44 into close contact with the bottom surface of the heating chamber 1. Reference numeral 45 denotes a buffer member made of a dielectric material, and the fixture 44 is hooked to the lower part of the part 61 in order to prevent vibration noise caused by the impact between the bottom surface of the heating chamber 1 and the support base 42 when the kneading blades 14 rotate. belongs to. This buffer member 46 is fixed to the lowermost part of the support base 42 by a buffer member support 66 that is fixed to a column 84 provided on the support base 42 with a screw 65. 47 is the first
This is a choke cavity surrounded by a cylindrical peripheral wall 4e made of a non-magnetic metal material such as die-cast aluminum for reducing high frequency waves that tend to leak to the outside of the heating chamber 1 through the outer periphery of the drive shaft 17. In order to shorten the length of the second drive shaft 2 as much as possible to increase the effective space of the variable speed drive unit 16, the choke cavity 47 is arranged at right angles to the first drive shaft 17 than the axial thickness of the first drive shaft 17. Increase the diameter in the direction.

It is configured to form a so-called radial line.

Radio waves entering from the entrance 48 of the choke cavity 47 are confined within the choke cavity 47 and are not radiated to the outside.

Note that the first drive shaft 17 drives the kneading blades 14 through a through hole in the bottom of the heating chamber 1, but the liquid that falls from this through hole as indicated by the dotted arrow 49 does not enter the sliding part of the bearing A28. In order to do this, a waterproof plate 50 that surrounds the outer periphery of the first drive shaft 17 and protrudes is provided above the bearing A2B. The liquid that has fallen onto the waterproof plate 6o is drained through a small hole 4 made in the cavity wall.
6a, it falls onto the motor mount 31 through the small hole 26b made in the large pulley 26, flows along the mount 31, and is finally discharged to the outside through the intake hole 32.

On the other hand, as shown in FIG. 2, a permanent magnet 67 is attached to the support base 42, and the fixture 44. A permanent magnet e that passes through the bottom of the heating chamber 1
A magnetically sensitive element 68 provided outside the heating chamber 1 is operated by the magnetic field from the heating chamber 1, and the kneading blades 14 are rotated at high speed during this operation, that is, when the bread container 12 is in operation. Examples of the magnetically sensitive element 68 include a reed switch in which two ferromagnetic leads are sealed in a glass tube, a Hall element whose resistance value changes depending on a magnetic field, and the like.

Next, the operation of this embodiment having the above configuration will be explained.

In the case of bread baking using the bread container 12, the bread container 12 is installed in the heating chamber 1 as in a home bakery, as shown in FIG. Put the bread raw material 13 into the bread container 12 and knead the bread raw material 13 by rotating the kneading blade 14 at around 20 rpm by the variable speed drive unit 16.
2nd fermentation by adding heating using lower heaters 4 and 6 and high frequency energy as appropriate.

After a process such as degassing by rotating the kneading blade 14 for several seconds, baking can be carried out in a short time. In this case, the bread has the cross-sectional shape of the bread container 12 and becomes a so-called mountain-shaped bread with a raised upper part.

When making bread of other shapes such as rolls, knead and ferment in the bread container 12, and then transfer the dough to the bread container 1.
2 is taken out from the heating chamber 1, the bread raw materials 13 are divided into pieces according to the desired type of bread, rolled into balls, and placed on a square plate 7 as in an electric open or open range as shown in Fig. 6 for shaping and fermentation. You can do everything from cooking to baking.

When using the turntable 19, as shown in FIG. 6, the turntable 19 on which the object to be heated 18 is placed and the turntable 2° supporting the turntable 19 are placed in the heating chamber, similar to a single-function microwave oven or microwave oven. 1, and the turntable 19 is moved from 6 to o by the variable speed drive unit 16.
Rotate at rpm. High frequency energy supplied from the high frequency oscillator 2 into the heating chamber 1 or the upper and lower heaters 4
, 6, the object to be heated 18 can be heated and cooked.

Furthermore, since the permanent magnet θ7 attached to the support base 42 of the bread container 12 and the magnetically sensitive element provided outside the heating chamber 1 are rotated at high speed, electrical components at the bottom of the heating chamber 1 are It is possible to prevent insulation defects caused by food scraps and liquid juices falling onto the device, and there is no need to provide a special structure to prevent leakage of radio waves.

Further, in this embodiment, the upper and lower heaters 4 and 6 are used as heat sources, but similar cooking performance can be obtained even if hot air is blown from outside the heating chamber 1 using an electric heater or a gas heater as a heat source.

(Effects of the Invention) According to the present invention, one of a turntable on which an object to be heated is placed and a stirring vessel rotatably built in a stirring blade using a high-frequency oscillator as a heating source is placed in a heating chamber. Be sure to install it selectively.

A variable-speed drive unit is installed below the heating chamber to drive either the low-speed rotation of the turntable or the high-speed rotation of the stirring blades, allowing for appropriate cooking operations depending on the purpose and heating of the stirring container. A magnetically sensitive element installed outside the solid chamber is operated at the bottom of the stirring vessel, and the stirring blade is rotated at high speed only during this operation. It is possible to prevent the insulating subfloor from falling and adhering food scraps and liquids to electrical components, and furthermore, there is no need to provide a special radio wave leakage prevention structure, and safety is improved.

Furthermore, it can be expanded to various functions such as microwave ovens, electric ovens, and home bakeries, and is advantageous in terms of economy and space saving, and the effects of implementation are great.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a high-frequency heating device showing an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the main part. Figure 3 is a top view of the fixture, Figure 4 is a cross-sectional view of the high-frequency heating device (for home bakeries), Figure 6 is a cross-sectional view of the same (for microwave ovens), and Figure 6 is a cross-sectional view of the same (for electric ovens). (for oven use). 1... Heating chamber, 2... High frequency oscillator, 12... Stirring container (bread container), 13... Food raw material (bread raw material)
. 14... Stirring blade (kneading blade), 16... Variable speed drive unit. 18.゛Heated object 19. Turntable, 42
. . . Support stand, 44 . Fixture, 67 . Permanent magnet, 68 . Magnetic sensing element.

Claims (1)

[Claims] A turntable (using a high frequency oscillator (2) as a heating source and rotatably placing an object to be heated (18) in a heating chamber (1)
19), a stirring container (12) for stirring the food raw material (13), a stirring blade (14) rotatably provided inside the stirring container (12), and a heating chamber ( 1
) Below is a variable speed drive unit (16) that drives either the low speed rotation of the turntable (19) or the high speed rotation of the stirring blade (14), and the stirring container (12) is connected to the heating chamber (1).
a support stand (42) fixed to the bottom of the stirring vessel (12) to hold it on the bottom of the heating chamber (12); and a fixture (44) for removably fixing this support (42) to the bottom of the heating chamber (1). The bottom surface of the heating chamber (1), the support stand (42) and the fixture (44) are formed from a non-magnetic metal material, and the support stand (42)
Attach the permanent magnet (67) to the outer surface of the lower part and attach the fixture (44).
, a magnetically sensitive element (68) is provided which is operated by the magnetic field from the permanent magnet (67) passing through the bottom of the heating chamber (1) to detect attachment and detachment of the stirring vessel (12).
A high-frequency heating device characterized in that the stirring blade (14) rotates at high speed only when it is attached.