JPH01256720A - Microwave oven - Google Patents

Abstract

PURPOSE:To perform a proper cooking in compliance with a purpose, to prevent a spark or a fire ignition and causes a microwave oven to be endurable for its use of long period of time by a method wherein a variable speed driving part for performing a low speed rotation of a turn table or a high speed rotation of a kneading vane is arranged below a heating chamber and claws arranged at a driving piece of an upper part of a first driving shaft is arranged within a cylindrical projection. CONSTITUTION:A turn table 19 installed within a heating chamber 1 and a transmission driving part 16 arranged below the heating chamber 1 may perform a heating operation while rotating a heated item 18 itself. A bread container 12 and a transmission driving part 16 are used while the bread container 12 is kept still. A kneading vane 14 is rotated at a high speed to knead dough 13. Then, the material is processed with fermentation, removal of gas and a formation together with a fermentation and the like and the material can be baked. In addition, a cylindrical projection 67 winding around a through-pass hole 52 at a bottom surface of a heating chamber and claws 17b arranged within a cylindrical projection 67 arranged at a driving piece 17a at an upper part of a first driving shaft 17 for use in driving the kneading vane 14 are not exposed to a high frequency within the heating chamber and also not exposed to a maximum electric field at an inlet port of a choke. When a microwave heating is carried out, a food scum or carbide such as soup and the like entered in the space between it and the claw 17b is prevented from being sparked or ignited.

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) Conventionally, this type of high-frequency heating device was developed in U.S. Pat.
This is proposed in Publication No. 9. In this configuration.

A container is removably attached to a turntable rotatably provided in a heating chamber, and a stirring blade provided inside the container is removably attached to a fixed shaft passing through the rotating shaft of the turntable.

(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 5 to 5 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 eliminate the above-mentioned drawbacks, and uses a high frequency oscillator and a heat generating source such as an upper and lower heater as a heating source, and includes a turntable on which an object to be heated is placed, and a kneading machine. Either one of the bread containers containing rotatable blades is selectively installed in the heating chamber, and a gearbox is set below the heating chamber to drive either the low-speed rotation of the turntable or the high-speed rotation of the kneading blades. A cylindrical protrusion is provided in a through-hole at the bottom of the heating chamber surrounding the through-hole, and a cylindrical protrusion is provided on a drive piece at the top of the first drive shaft that drives the kneading blades through the through-hole. A claw is arranged within the cylindrical protrusion. The cylindrical protrusion also limits the size of the chimique cavity provided around the first drive shaft.

This maximizes the damping effect.

(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 5 to 6 rpm. 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 high speed at around 20 rpm to knead the bread ingredients. After that, it can be fermented, degassed, shaped and fermented, and then baked. Furthermore, a cylindrical protrusion surrounding the through hole on the bottom of the heating chamber, and a drive piece on the upper part of the first drive shaft that drives the kneading blades through the through hole are arranged in the cylindrical protrusion. The claws are not exposed to the high frequency waves in the heating chamber, nor are they exposed to the maximum electric field at the entrance of the chimney.

It works to prevent sparks and ignition of charred substances such as food particles and broth that get between the claws during high-frequency 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 to the heating chamber 1 via a waveguide 3 for directly dielectrically heating the inside of the food. 4 is an upper heater, and 5 is a lower heater, which are heating sources used during open cooking such as cakes and bread baking. 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. 1o is an outer box, and 11 is a leg attached to the lower surface of the outer box 1o. 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 variable speed drive unit, which drives a turntable 19 (FIG. 6) on which the object to be heated 18 is placed at a speed of 5 to 5 rpm.
A table motor 22 rotates at a low speed, and a kneading blade 14 is rotated 20 or more times when baking bread using the bread container 12.
The driving source is a kneading motor 23 that rotates at high speed around m.

17 is a first drive shaft which transfers the rotational force of the kneading motor 23 to a small boot 9-24, a belt 26. This is for transmitting the signal to the rotating shaft 16 of the kneading blade 14 via the 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 430 or 8US420.

A drive piece 17a made of die-cast aluminum or zinc and suitable for machining complex shapes is press-fitted into the upper end of the first drive 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 the second drive shaft, which is the table motor 2.
This is for transmitting the rotational force of No. 2 to the rotary connection shaft 21 of the turntable 2o which rotatably supports the turntable 19 as shown in FIG. Note that the second drive shaft 27 is made of a dielectric material that is transparent to high frequencies. 28 is the first drive shaft 1
7, and 29 is the bearing B for the rotating shaft 16.
It is made by impregnating sintered metal with lubricating oil. The second drive shaft 27 passes through a hollow portion of the first drive shaft 17. 31 is a motor mounting base for mounting the table motor 22 and the kneading motor 23 so as not to expose them to the heating chamber 1 side. 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 drive 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 rotating shaft 15 from coming off upward, and is fitted to the upper driving piece 17a of the first drive shaft 17 to form a dog clutch. It is something to do. 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.

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. Reference numeral 43 denotes a rivet for fixing the support base 42 and the bread container 12.

Note that the bearing B29 for the rotating shaft 15 of the kneading blade 14 is press-fitted into a bearing holder 69, and this bearing holder 69 is formed integrally with the support base 42. A bearing holder 59 protrudes from the bottom surface of the bread container 12, but in order to prevent the upper outer surface of the protruding bearing holder 59 from being directly exposed inside the bread container 12, a cracked aluminum cap 39 coated with tetrafluoroethylene resin is attached to the bearing holder. It is fixed to the top of 59. Reference numeral 44 denotes a fixture for removably fixing the support base 42 to the bottom of the heating chamber 1. As shown in FIG. It is formed by drawing.

51 is 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 is connected by setting the gap size P between adjacent portions 51 to 1/2 or less of the used wavelength λ, and then passing the support plate 42 (!: from the through hole on the bottom of the heating chamber 1 through the gap on the bottom of the heating chamber 1). This serves as a cutoff for high frequencies that tend to leak 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 46 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 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 53 denotes a set screw 6 that tightly attaches the periphery of the fixture 44 to the bottom surface of the heating chamber 1.
This is a small hole through which 4 is passed. 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 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 64 provided on the support base 42 with a screw 65. 46 is the first drive shaft 1
This is a cavity wall surface made of a metal body such as aluminum die-casting for forming a choke cavity 47 for reducing high frequency waves that try to leak to the outside of the heating chamber 1 through the outer periphery of the heating chamber 1 . By shortening the second drive shaft 27 as much as possible, the variable speed drive unit 1
In order to increase the effective space of 6, choke cavity 47
The diameter in the direction perpendicular to the first drive shaft 17 is set larger than the thickness of the first drive shaft 17 in the axial direction. It is configured to form a so-called radial line.

Radio waves entering from the entrance 48 of the f-yoke cavity 47 travel toward the cavity wall 4e, are reflected by the cavity wall 46, and return to the entrance 48.

Note that the first drive shaft 17 drives the kneading blades 14 through a through hole 62 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 A2B. In order to prevent this from entering, a waterproof plate 60 that extends around the outer periphery of the first drive shaft 17 is provided above the bearing A2B. The liquid that has fallen onto the waterproof plate 5o falls onto the motor mounting base 31 through a small hole 46a made in the cavity wall and a small hole 26b made in 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. 3, a drive piece 17 on the top of the first drive shaft 17 drives the kneading blades 14 through the through hole 62 on the bottom of the heating chamber 1.
The pawl 17b provided at a is disposed within a cylindrical protrusion 67 surrounding the through hole 62.

The cylindrical protrusion 67 regulates the dimension A of the inlet 48 of the choke cavity 47 provided around the first drive shaft 17 .

This maximizes the damping effect.

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 placed in the bread container 12, and the kneading blades 14 are rotated at around 20 Orpm by the variable speed drive unit 16 to knead the bread raw material 13, after which heating is appropriately applied using the upper and lower heaters 4, 6 and high frequency energy.

After fermentation, degassing by rotating the kneading blade 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 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. 6, the turntable 19 on which the object to be heated 18 is placed and the rotary stand 2o that supports the turntable 19 are placed in the heating chamber 1, as in the case of a single-function microwave oven or a microwave oven. The turntable 19 is installed in
Rotate at rpm. The 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.

Furthermore, the pawl 17b provided on the drive piece 17a is not directly exposed to the high frequency waves in the heating chamber 1, and the inlet 4 of the choke cavity 47
Because it is not exposed to the maximum electric field of 8.

It has been experimentally confirmed that even if food waste or broth gets into the space between the pawls 17b and becomes carbonized during high-frequency dry baking, it will not cause sparks or ignition.

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 gas heater as a heat source.

(Effects of the Invention) According to the present invention, the high frequency oscillator and the upper and lower heaters are used as heating sources to heat either the turntable on which the object to be heated is placed or the bread container in which the kneading blades are rotatably incorporated. It is installed selectively in the room, and is equipped with an irregular drive unit 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 cylindrical protrusion is provided in the through hole at the bottom of the heating chamber surrounding the through hole, and a pawl is provided on the drive piece at the top of the first drive shaft that drives the kneading blades through the through hole. is arranged in the cylindrical protrusion, and the cylindrical protrusion regulates the dimensions of the choke cavity provided around the first drive shaft to maximize the damping effect, so that during high frequency dry firing, Even if food particles or boiling liquid get caught between the claws and become carbonized, they will not cause sparks or ignition, making them durable for long-term use.

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.

The effects of implementation are significant.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional view of a high-frequency heating heating device (for home bakery) showing one embodiment of the present invention, and Fig. 6 is a cross-sectional view of the same (for home bakery use).
(for microwave oven), Figure 6 is the same cross-sectional view (for electric oven)
It is. 1...Heating chamber, 2...High frequency oscillator, 4...Upper heater, 5...Lower heater, 12...Bread container, 1
3... Bread raw material, 14... Kneading blade, 16... Irregular drive unit. 17...First drive shaft, 17a...Drive piece, 17b...
・Tlaws. 18... Heated object, 19... Turntable, 47
. . . Choke cavity, 48. Inlet, 52. Through hole, 6. . . Cylindrical protrusion.

Claims (2)

[Claims] (1), high frequency oscillator (2) and upper and lower heaters (4),
(5) etc. as a heating source, a turntable (19) on which an object to be heated (18) is rotatably placed, and a kneading blade (14) for rotatably performing a kneading operation are built-in, and bread ingredients ( Either one of the bread containers (12) for performing the kneading operation to baking in step 13) is selectively installed in the heating chamber (1), and a low-speed turntable (19) is placed below the heating chamber (1). It is equipped with a variable speed drive unit (16) that drives either rotation or high-speed rotation of the kneading blade (14), and the through hole (52) is connected to the through hole (62) on the bottom of the heating chamber (1).
), and a cylindrical protrusion (67) is provided on the drive piece (17a) above the first drive shaft (17) that drives the kneading blade (14) through the through hole (52). A high-frequency heating device characterized in that a claw (17b) is disposed within the cylindrical protrusion (67). (2) A cylindrical protrusion (67) is provided to regulate the dimension (A) of the inlet (48) of the choke cavity (47) provided around the first drive shaft (17) and to maximize the damping effect. The high frequency heating device according to claim 1.