JPH01272090A - Microwave oven - Google Patents

Abstract

PURPOSE:To allow cooking actions according to objectives and prevent spark and abnormal heating by providing a speed change driving section driving one of the high-speed rotation of a kneading blade at the lower section of a heating chamber and the low-speed rotation of a turn table and a shade-shaped suppressing plate made of metal on a rotary connecting shaft. CONSTITUTION:When bread is to be baked using a bread container 12, bread dough is put in the bread container 12, a kneading blade 14 is rotated by a speed change driving section 16 at about 200rpm to knead the bread dough, then bread is baked through various processes. When a turn table 19 is to be used, the turn table 19 mounting an object to be heated and a rotary bed 20 are installed in the heating chamber 1, the table 19 is rotated by the speed change driving section 16 at 5-6rpm. The high-frequency energy entering the gap between the rotary bed 20 and the bottom of the heating chamber 1 is hard to infiltrate into a through-hole 52 as h1/h2 is made smaller, where h1 is the gap between a shade-shaped suppressing plate 67 and the bottom of the heating chamber 1 and h2 is the gap with the rotary bed 20. The occurrence of a spark and abnormal heating is prevented even when food waste or the like is stuck to the first driving shaft 17.

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.

2. Prior Art A conventional high-frequency heating device of this type was developed in U.S. Pat.
This is proposed in Publication No. 89. 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 limited to 5 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 provides a turntable on which an object to be heated is rotatably placed, using a high frequency oscillator and heat sources such as upper and lower heaters as heating sources. and,
Either one of the bread containers containing rotatably built-in kneading blades is selectively installed in the heating chamber, and the speed changer drives either the high-speed rotation of the kneading blades or the low-speed rotation of the turntable below the heating chamber. A second drive shaft is provided which passes through the central axis of the first drive shaft that drives the kneading blades through a through hole in the bottom of the heating chamber and drives the turntable, and when the turntable is used, the turntable is activated. A rotary connecting shaft that engages with the second drive shaft is fixed to a rotary table that is detachably supported, and high frequency energy that has entered the gap between the rotary table and the bottom surface of the heating chamber is prevented from entering the through hole. A metal cap-shaped deterrent plate is attached to suppress this, and the diameter of the cap-shaped deterrent plate is made larger than the diameter of the through hole.

Operation With the above configuration, the turntable provided in the heating chamber and the variable speed drive section provided below the heating chamber have the function of performing heat treatment while rotating the object to be heated at a low speed of about 5 to 6 rpm. 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 It can be degassed, molded and fermented, and then baked. Furthermore, the second sleeping shaft is attached to the center axis of the first moving shaft, which is provided through the through hole in the bottom of the heating chamber, and to the rotary table that removably supports the turntable when the turntable is used. A rotary connection shaft that engages with the second drive shaft, and a metal deterrent disk whose diameter is larger than the diameter of the through hole attached to the rotary connection shaft. Even if it adheres, the high frequency energy that has entered the gap with the bottom surface of the heating chamber is suppressed from entering the through hole, thereby preventing the occurrence of sparks and abnormal heating.

Example An embodiment of the present invention will be described below with reference to the drawings.

The configuration of the embodiment is as shown in FIGS. 1 to 6.

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 through a waveguide 3 to the heating chamber 1 for directly dielectrically heating the inside of 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 surface 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. Reference numeral 12 denotes a bread container that automatically kneads bread ingredients 13 made of flour, yeast, water, etc. and bakes them using 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 variable speed drive unit, which drives a turntable 19 (FIG. 5) on which the object to be heated 18 is placed.
The table motor 22 rotates at a low speed of 200 pm, and the kneading blade 14 is rotated at 200 pm when baking bread using the bread container 12.
The kneading motor 23, which rotates at high speed before and after rp, is used as a waste power source. 17 is a first drive shaft, which transfers the rotational force of the kneading motor 23 to a small pulley 24, a belt 25,
This is for transmitting the signal to the rotating shaft 15 of the kneading blade 14 via the large pulley 26. Note that the first drive shaft 17 is 5U.
It is made of a metal cylinder made of highly hard stainless steel such as S303.5US430.5US420.

A driving piece 17a made of die-cast aluminum or zinc and suitable for machining complicated shapes is press-fitted into the upper part of the first N driving shaft 17. The large pulley 26 is made of synthetic resin with good workability only on the outer periphery, and the other parts are made of metal plate molded product 26.
It is a. , 27 is a second drive shaft which transfers the rotational force of the table motor 22 to the turntable 19 as shown in FIG.
This is for transmitting the information to the rotational connection shaft 21 of the rotating table 20 that rotatably supports the rotational speed. Note that the second drive shaft 27 is made of a dielectric material that is transparent to high frequencies. 28 is a bearing A for the first deer movement shaft 17. A bearing B 29 for the rotating shaft 15 is made of sintered metal impregnated with lubricating oil.

The second drive shaft 27 passes through the central axis of the first drive shaft 17 and also passes through the through hole 52 on the bottom surface of the heating chamber 1. 31 is a table motor 22 and a kneading motor 23
This is a motor mounting base for attaching the motor. Reference numeral 32 denotes an intake hole for taking in outside air into the motor mounting base 31 to cool electrical components. Numeral 33 is a nut for fixing the large tail z6 to the first drive shaft 17. 33a is a state in which the large pulley 26 is attached to the first drive shaft 17,
This is a reinforcing plate that increases the contact area and prevents shaking. 3
4 is a hollow disk that receives the thrust load of the drive piece 17a on the upper part of the first rfA moving shaft 17.

Reference numeral 35 denotes a driven piece attached by a rivet 37 or the like to the lower part of the support fitting 36 that prevents the rotation shaft 15 from being dislodged upward, and is fitted to the drive piece 17a on the upper part of the first drive shaft 17 to form a dog clutch. It is something. 38 is the bread raw material 13 placed in the bread container 12. In particular, this is an oil seal made of silicone rubber to prevent liquid from spilling. Reference numeral 42 denotes 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. 4
Reference numeral 3 denotes a rivet for fixing the support base 42 and the bread container 12. Note that the bearing B2 for the rotating shaft 15 of the kneading blade 14
9 is press-fitted into a bearing holder 59, and this 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 support stand 4
2 to the bottom of the heating chamber 1 in a removable manner.As shown in FIG. It is something. Reference numeral 51 denotes a hook formed on the fixture 44 for hooking and fixing the lower end of the support base 42 of the bread container 12, and the hook 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 size P between adjacent parts 51 to 172 or less of the wavelength λ used, and passes through the bottom through-hole 5 of the heating chamber 1.
This is a cut-off for high frequencies that are about to leak from the 2 to the outside. Reference numeral 53 denotes 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 45 denotes a buffer member made of a dielectric material, and the fixture 44 is hooked onto the lower part of the part 51 when the kneading blades 14 rotate.
This is to prevent vibration noise caused by impact between the bottom surface of the support base 42 and the support base 42. This buffer member 45 is
A buffer member support 6 is fixed to a column 64 provided in the
646 is fixed to the lowest part of the support base 42 by a choke cavity 47 for reducing high frequency waves that are about to leak to the outside of the heating chamber 1 through the outer periphery of the first drive shaft 17. It is a cavity wall surface made of a metal body such as aluminum die-casting for forming. In order to make the second drive shaft 27 as short as possible to increase the effective space of the variable speed drive unit 16, the choke cavity 47 is formed in a direction perpendicular to the first drive shaft 17, which is larger than the axial thickness of the first drive shaft 17. Make the diameter larger. It is configured to form a so-called radial line. Radio waves entering from the entrance 48 of the choke cavity 47 travel toward the cavity wall 46, are reflected by the cavity wall 46, and return to the entrance 48.

Note that the first m moving shaft 17 drives the kneading blades 14 through a through hole 52 in the bottom of the heating chamber 1, and the liquid that falls from this through hole 52 as indicated by a dotted arrow 49 hits the sliding part of the bearing A28. In order to prevent this from entering, a waterproof plate 50 that extends around the outer periphery of the first drive shaft 17 is provided above the bearing A28. The liquid that has fallen onto the waterproof board 50 falls onto the motor mounting base 31 through the small hole 46a made in the cavity wall and the small hole 26b made on the large pulley 26, and then falls onto the motor mounting base 31.
, and is finally discharged to the outside through the intake hole 32. In FIG. 2, 68 is a connecting plate that connects the rotary table 20 and the rotary connecting shaft 21. As shown in FIG. 67 is the rotation connecting shaft 2
This is a metal cap-shaped restraining plate fixed to 1. This vertical suppression plate 67 suppresses the high frequency energy that has entered the gap between the rotating table 20 and the bottom surface of the heating chamber 1 from entering the through hole 52 . The diameter of the cap-shaped restraining disk 67 is made larger than the diameter of the through hole 52.

Further, in order to prevent the boiling liquid from flowing down from the bottom surface of the heating chamber 1, a protrusion 1a surrounding the through hole 52 is provided, and cap-shaped restraining plates 9 are disposed on the protrusion 1a at approximately equal intervals.

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. Bread ingredients 13 are put into the bread container 12, and the kneading blades 14 are rotated at 200 rpm+a by the variable speed drive unit 16.
Knead bread ingredients 13 by rotating back and forth.

After that, heating by the lower heaters 4 and 5 and high frequency energy is added as appropriate, and through processes such as fermentation and degassing by rotating the kneading blades 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, 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 rp+m. From high frequency oscillator 2 to heating chamber 1
The object to be heated 18 can be heated and cooked by the high frequency energy supplied inside or by the upper and lower heaters 4 and 5.

Furthermore, the high frequency energy that has entered the gap between the rotary table 20 and the bottom of the heating chamber 1 is hi/ The smaller h2 is, the more difficult it is to enter the through hole 52. Furthermore, if the diameter of the cap-shaped restraining plate 67 is made larger than the diameter of the through hole 52, the high-frequency energy reaches the vicinity of the upper part of the first moving shaft 17 after being divided vertically by the cap-shaped restraining plate 67. Therefore, in the unlikely event that food particles are deposited on the top of the first drive shaft 17,
No sparks or abnormal heating will occur even if boiling liquid etc. adheres to the product.

Further, in this embodiment, upper and lower heaters 4.5 are used as heat sources, but similar cooking performance can be obtained by blowing hot air 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 and a heat generating source such as an electric heater are used as heating sources, and either a turntable on which an object to be heated is placed, or a bread container rotatably incorporating kneading blades. are selectively installed in the heating chamber, and a variable-speed drive section is installed below the heating chamber to drive either the high-speed rotation of the kneading blades or the low-speed rotation of the turntable, allowing for appropriate cooking according to the purpose. can be operated.

Also, the first g that drives the kneading blades through the through hole on the bottom of the heating chamber! A second drive shaft is provided that passes through the center axis of the drive shaft and drives the turntable, and a rotary connection shaft that engages with the second drive shaft is fixed to a rotary table that removably supports the turntable when the turntable is used.

A metal cap-shaped suppression plate with an outer diameter larger than the diameter of the through-hole is attached to the rotating connection shaft to prevent high-frequency energy that has entered the gap between the rotating table and the bottom of the heating chamber from entering the through-hole. Even if food waste, broth, etc. adhere to the upper part of the first drive shaft, the cap-shaped suppression plate suppresses high frequency energy entering the through hole, thereby preventing sparks and abnormal heating.

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 the main parts of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is an enlarged sectional view of the main parts showing the turntable mounting structure, Fig. 3 is a plan view of the fixture, and Fig. 4 The figure is a cross-sectional view of the high-frequency heating device (for home bakery use), FIG. 5 is the same cross-sectional view (for microwave oven use), and FIG. 6 is the same cross-sectional view (for electric oven use). 1... Heating chamber, 2... High frequency oscillator, 4...
...Upper heater, 5...Lower heater. 12... Bread container, 13... Bread raw materials. 14... Kneading blade, 16... Variable speed drive unit, 1
7... First drive shaft, 18... Heated object, 19.
... Turntable, 20... Turntable, 21...
Rotating connection shaft, 27... Second drive shaft, 52... Through hole, 67... Cap-shaped restraining plate.

Claims (1)

[Claims] 1. High frequency oscillator (2), upper and lower heaters (4), (
A turntable (19) on which an object to be heated (18) is rotatably placed, and a kneading blade (14) for kneading bread ingredients are rotatably built in, using a heat source such as 5) as a heating source. Either one of the bread containers (12) is selectively installed in the heating chamber (1), and the high-speed rotation of the kneading blade (14) and the low-speed rotation of the turntable (19) are arranged below the heating chamber (1). The central axis of the first drive shaft (17) that drives the kneading blades (14) through the through hole (52) in the bottom of the heating chamber (1) is A second drive shaft (
27), and a rotary table (20) that removably supports the turntable (19) when the turntable (19) is used.
A rotary connecting shaft (21) that engages with the second drive shaft (27) is fixed to the rotary connecting shaft (21), and the high-frequency energy that has entered the gap between the rotary table (20) and the bottom of the heating chamber (1) is fixed to the rotary connecting shaft (21). A high-frequency heating device characterized in that a metal cap-shaped prevention plate (67) is attached to prevent the metal from entering the through hole (52). 2. The high-frequency heating device according to claim 1, wherein the diameter of the cap-shaped restraining plate (67) is larger than the diameter of the through hole (52).