JPH01212824A - High-frequency heater - Google Patents

Abstract

PURPOSE:To make a heater adaptable to different purposes by equipping the heater with a high-frequency oscillator and a set of heating element, such as one part above and another part below, and with a variable speed-drive unit under the heating chamber which rotates either a turntable at a low speed or a kneading blade at a high speed. CONSTITUTION:When bread is baked in a baking pan 12, the dough 13 contained in the baking pan 12 loaded in place in the heating chamber 1 are kneaded by a kneading blade 14 driven by a variable speed-drive 16 at about 200rpm, then fermented under heating by the upper heating element 4 and the lower one 5 and additional application of high-frequency wave energy, and through breathing with the help of rotation of the kneading blade 14 for several seconds, and so on, the baking is completed through an integrated process for a short time. When a turntable 19 is used, a turntable 19 on which food 18 to be heated is loaded and a rotary support 20 on which the turntable is fitted are mounted in place in the heating chamber 1 and the turntable 19 is rotated by the variable speed-drive 16 at 5-6rpm; the food 18 to be cooked is heated by high-frequency wave energy emitted from a high-frequency oscillator 2 into the heating chamber 1 or by the upper heating element 4 and the lower one 5.

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.

Conventional technology This kind of high frequency heating device with food stirring function is
This is proposed in Japanese Utility Model Application Publication No. 55-71489.

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.

Problems to be Solved by the Invention According to the above configuration, the stirring blade is stationary and the container itself, which is attached to the turntable, rotates. fast rotation).

The object to be heated will fly out due to inertia. Therefore, the rotation speed of the turntable during normal high-frequency heating is 5 to 6 rpm.
There was a problem that sufficient stirring performance could not be obtained.

Means for Solving the Problems The present invention has been made in order to solve the above problems, and uses a high frequency oscillator and heat sources such as upper and lower heaters as heating sources, a turntable on which an object to be heated is placed, and a kneader. Either one of the bread containers containing rotatable blades is selectively installed in the heating chamber, and a speed change is performed to drive either the low-speed rotation of the turntable below the heating chamber or the high-speed rotation of the kneading blades. A support stand is fixed to the bottom of the bread container, and a permanent magnet is attached to this support stand, and the magnetic field from this permanent magnet is generated outside the heating chamber. Operate the magnetically sensitive element,
The kneading blades are rotated at high speed during this operation.

Operation With the above-described configuration, the turntable provided in the heating chamber and the variable speed drive section provided below the heating chamber have the effect of performing heat treatment while rotating the object to be heated at a low speed of about 5 to 6 rp+a. However, the bread container installed in the heating chamber and the variable speed drive unit installed below the heating chamber are used while the bread container is stationary, and the kneading blades are rotated at a high speed of around 20 rpm to knead the bread ingredients, and then fermentation and gas releasing,
After forming and fermenting, it can be baked within a short time by using high frequency heating and heater heating. A support stand fixed to the bottom of the bread container can hold the bread container at the bottom of the heating chamber, and a permanent magnet attached to this support stand,
A magnetically sensitive element provided outside the heating chamber is operated by the magnetic field from this permanent magnet, and has the effect of causing the kneading blades to rotate at high speed during this operation.

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, FIG. 2 is an enlarged cross-sectional view of the same main part, FIG. 3 is a top view of the fixture, and FIG. Figure 5 is a cross-sectional view of the high-frequency heating device (for home bakery use), and Figure 5 is the same cross-sectional view (for microwave oven use).
, FIG. 6 is a sectional view of the same (for electronic oven).

In the figure, 1 is a heating chamber provided within the high-frequency heating device. Reference numeral 2 denotes a high frequency oscillator that supplies high frequency energy to the heating chamber 1 via a waveguide 3 for internally dielectrically heating the food. 4 is an upper heater, and 5 is a lower heater, which are heat sources for browning oven dishes such as cakes and breads.

Reference numeral 6 denotes a plate tray that supports a square plate 7 (FIG. 6) used during oven 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 10. 12 is flour and yeast.

This bread container automatically kneads bread ingredients 13 made of water and the like and bakes them by high frequency heating and heater heating. Reference numeral 14 denotes a kneading blade rotatably provided at the lower part of the bread container 12. 15 is a rotation axis of the kneading blade 14.

In FIG. 1, reference numeral 16 denotes a table motor 22 that rotates a turntable 19 (FIG. 5) 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 low speed of 5 to 6 rpm on which a heated object 18 is placed. ．． The kneading motor 23 is a variable speed drive unit whose driving source is a kneading motor 23 that rotates at high speed before and after Orpm. A first drive shaft 17 transmits the rotational force of the kneading motor 23 to the rotating shaft 15 of the kneading blade 14 via a small pulley 24, a belt 25, and a large pulley 26. The first driving shaft 17 is 5 (IS304.5US43
It is made of a metal cylinder made of stainless steel with high hardness such as 0.5US420. A drive piece 17a made of die-cast aluminum or zinc and suitable for lowering a complicated shape 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. A second drive shaft 27 transmits the rotational force of the table motor 22 to the rotational connection shaft 21 of the turntable 20 that rotatably supports the turntable 19, as shown in FIG. Note that the second moving shaft 27 is made of a dielectric material that is transparent to high frequencies.

28 is the first yJ, a bearing A for the moving shaft 17. 29
A bearing B for the rotating shaft 15 is made of sintered metal impregnated with lubricating oil. 21st i! The moving shaft 27 passes through a hollow portion of the first drive shaft 17. Reference numeral 31 is a motor mounting base for mounting the table motor 22 and the table motor 23. 32 is the motor mounting stand 31
This is an air intake hole that brings in outside air to cool electrical components. 33 is a nut for fixing the large pulley 26 to the first drive shaft 17. 33a is large pulley 2
6 is a reinforcing plate that increases the contact area and prevents shaking when 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 moving shaft 17. Reference numeral 35 denotes a driven piece attached by a rivet 37 or the like to the lower part of a support fitting 36 fixed to the rotating shaft 15 to prevent the rotating shaft 15 from being dislodged upward;
It fits into the upper moving piece 17a to form a dog clutch. Reference numeral 38 denotes an oil seal made of silicone rubber or the like to prevent the bread ingredients 13 contained in the bread container 12, especially the liquid, from spilling. 42 is a bread container 12 for holding the bread container 12 on the bottom surface inside the heating chamber 1;
It is a support stand fixed to the bottom of the. Reference numeral 43 denotes a rivet for fixing the support base 42 and the bread container 12. The bearing B29 for the rotating shaft 15 of the kneading blade 14 is the bearing holder 5.
Although the bearing holder 59 is press-fitted into the bearing holder 9 , the bearing holder 59 is formed integrally with the support base 42 . A bearing holder 59 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 59 is not directly exposed inside the bread container 12. It is fixed to the top of 59. 44 is a fixture for detachably fixing the support base 42 to the bottom surface of the heating chamber 1;

It has a shape as shown in FIG. 3, and is formed by drawing a non-magnetic material made of the same material as the bottom of the heating chamber 1, for example, a metal plate of 5US304. 51 is a support stand 42 for the bread container 12
A hook is formed on the fixture 44 for hooking and fixing the lower end of the support base 42, and the hook engages with the foot 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 to the outside through the through hole in the bottom of the heating chamber 1 by setting the gap size P between adjacent portions 51 to 1/2 or less of the wavelength λ used. This is a cutoff for high frequencies that are about to leak. Reference numeral 53 indicates a small hole through which a set screw 54 is inserted, which brings the periphery of the fixture 44 into close contact with the bottom surface of the heating chamber 1. Reference numeral 645 indicates a buffer member made of a dielectric material,
The hook is provided at the lower part of the part 51 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 blade 14 rotates. This buffer member 45 is fixed to the lowest part of the support base 42 by a buffer member support 66 that is fixed to a column 64 provided on the support base 42 with a screw 65. Reference numeral 47 denotes a cylindrical peripheral wall 4 made of a metal body such as die-cast aluminum for reducing high frequency waves that attempt to leak to the outside of the heating chamber 1 through the outer periphery of the first drive shaft 17.
It is a choke cavity surrounded by 6.

In order to shorten the second drive shaft 27 as much as possible to increase the effective space of the variable speed drive unit 16, the choke cavity 47 is designed to be thicker than the axial thickness of the first II moving shaft 17. It is configured to form a so-called radial line with a large diameter in the perpendicular direction. Radio waves entering from the entrance 48 of the choke cavity 47 travel toward the cylindrical peripheral wall 46 and are reflected by the cylindrical peripheral wall 46 to reach the entrance 48.
come back to.

Note that the first M moving 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 make it so, the first [! A waterproof plate 50 extending around the outer periphery of the moving shaft 17 is provided above the bearing A28. The liquid that has fallen onto the waterproof plate 50 falls onto the motor mount 31 through the small hole 46a made in the cavity wall and the small hole 26b made in the large pulley 26, flows along the mount 31, and finally is discharged to the outside through the intake hole 32.

On the other hand, a permanent magnet 67 is attached to the support base 42 as shown in FIG. It is made to rotate at high speed. The magnetically sensitive element 68 is, for example, a reed switch in which two ferromagnetic leads are sealed in a glass tube, a ball element whose resistance value changes depending on a magnetic field, or 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. The bread raw material 13 is put into the bread container 12, and the kneading blade 14 is rotated at around 200 rpm by the variable speed drive unit 16 to knead the bread raw material 13, and then the dough is kneaded.
By appropriately applying heating using the lower heaters 4 and 5 and high-frequency energy, processes such as fermentation, degassing by rotating the kneading blades 14 for several seconds, and 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 is 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, then remove the bread container 12 from the heating chamber 1 and mix the bread ingredients 13 according to the type of bread intended. It can be divided, rolled, placed on a square plate 7 in the same way as an electric oven or microwave oven as shown in Fig. 6, and subjected to the process from shaping and fermentation to baking.

When using the turntable 19, as shown in FIG. The turntable 19 is installed in
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
, 5, the object to be heated 18 can be heated and cooked.

Further, a permanent magnet 6 attached to the support base 42 of the bread container 12
7 and a magnetically sensitive element 68 provided outside the heating chamber 1, the kneading blades 14 are made to rotate at high speed only when the bread container 12 is installed inside the heating chamber 1 without making a hole in the heating chamber 1. Therefore, it is possible to prevent insulation failure due to falling and adhering of food scraps and liquid juices to the electrical components in the lower part of the heating chamber 1, and furthermore, there is no need to provide a special radio wave leakage prevention structure.

Further, in this embodiment, the upper and lower heaters 4 and 5 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, a high-frequency oscillator, upper and lower heaters, etc. are used as heating sources, and either a turntable on which an object to be heated is placed or a bread container in which kneading blades are rotatably incorporated are placed in a heating chamber. It is installed selectively and is equipped with a variable-speed drive section below the heating chamber that drives either the low-speed rotation of the turntable or the high-speed rotation of the kneading blades, allowing for appropriate cooking operations depending on the purpose. A support stand is fixed to the bottom of the bread container to hold the bread container on the bottom of the heating chamber, a permanent magnet is attached to this support stand, and the magnetic field from this permanent magnet allows heating without making a hole in the heating chamber. Activate the magnetically sensitive element installed outside the chamber.

Since the kneading blades are rotated at high speed during this operation, it is possible to prevent insulation failure due to falling food scraps and liquid juices onto the electrical components in the heating wire cavity, and it is also possible to prevent the need for a special radio wave leakage prevention structure. Safety is improved without any problems.

Furthermore, it can perform the functions of three machines such as a microwave oven, electric oven, and home bakery, making it economical and
It is also advantageous in terms of space saving, and the effects of implementing it are significant.

[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 5 is a cross-sectional view of the same (for microwave ovens), and Figure 6 is a cross-sectional view of the same (for microwave ovens). (for oven use). 1... Heating chamber, 2... High frequency oscillator, 4...
・Upper heater, 5...Lower heater, 12...Bread container, 13...Bread raw material, 14...Kneading blade,
16... Variable speed drive unit, 18... Heated object, 19...
- Turntable, 42... Support stand, 67... Permanent magnet. 68...Magnetic sensing element.

Claims (1)

[Claims] A high frequency oscillator (2) and a heat generating source such as upper and lower heaters (4) and (5) are used as heating sources, and an object to be heated (1) is placed in the heating chamber (1).
8), a turntable (19) on which is rotatably mounted;
A bread container (12) for kneading bread ingredients (13) to baking, a kneading blade (14) rotatably provided inside the bread container (12), and a heating chamber (1) that turns downward. Low speed rotation of table (19) and kneading blade (1
A variable speed drive unit (16) that drives one of the high-speed rotations of 4), and a support stand fixed to the bottom of the bread container (12) to hold the bread container (12) on the bottom surface of the heating chamber (1). (42), and a permanent magnet (6) is attached to this support (42).
7) is attached, and the magnetic field from this permanent magnet (67) operates the magnetic sensing element (68) provided outside the heating chamber (1), so that the kneading blade (14) rotates at high speed during this operation. A high-frequency heating device characterized by: