JPH01266437A - High frequency heating device - Google Patents

Abstract

PURPOSE:To perform forced convection of heat energy from an upper flat heater and a lower heater and to enable the execution of 2-stage cooking by a method wherein a high frequency oscillator, an upper flat heater, and a lower heater form a heating source, and a heating chamber at least the bottom of which is formed by a metallic plate of a non-magnetic substance and a circulating blower mounted to the outside of the side wall of the heating chamber are provided. CONSTITUTION:A high frequency oscillator 2, an upper flat heater 6, and a lower heater 8 form a heating source. A heating chamber 1 at least the bottom of which is formed by a metallic plate of a non-magnetic substance and a blower 9 for circulation mounted to the outside of the side wall of the heating chamber 1 so that the interior of the heating chamber 1 is brought into forced convection are provided. By performing processing ranging from kneading of dough for cake bread and pizza to primary fermentation by using a containerfull amount of a bread material, dough in a proper amount matching 2-stage cooking is handled. Thereby, through forced convection of heat energy from the upper flat heater 6 and the lower heater 8 with the aid of a blower 9 for circulation, 2-stage cooking by a turn table 32 and a turn table 32a with a leg is practicable.

Description

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

(Prior art) A conventional high-frequency heating device of this type
This is proposed in Publication No. 82. In this proposed configuration, the upper heater is disposed downward and away from the upper surface of the heating chamber. The lower heater is disposed floating above the bottom surface of the heating chamber, and is located above the bottom surface of the kneader. Furthermore, the bottom of the kneader is in direct contact with the bottom of the heating chamber. When the fixing piece protruding from the bottom of the kneading machine is inserted into the mounting hole provided on the bottom of the heating chamber and rotated by a predetermined angle, the fixing claw formed on the fixing piece will catch on the back side of the bottom of the heating chamber, and the kneading machine will The device can be attached to the heating chamber. The claw comes into contact with the actuator of a microswitch provided on the back side of the bottom of the heating chamber, and when the microswitch is turned on, bread-specific sequences such as fermentation and kneading can be performed.

(Problem to be solved by the invention) According to the above configuration.

(a) A hole is provided at the bottom of the heating chamber to detect whether the kneader is attached or detached. This hole is also used to secure the kneader to the bottom of the heating chamber. During this fixing, it is necessary to insert the fixing piece into the hole and rotate it by a predetermined angle, so the hole has to be large.

Therefore, there is a strong possibility that a large amount of food particles, liquid juice, etc. will flow out from this hole, causing an inconvenience.

(b) The upper heater is placed downward from the top of the heating chamber, and the lower heater is placed floating above the bottom of the heating chamber, so it gets in the way when putting in and taking out the kneading machine, and Effective space, especially height, is reduced.

(C) The lower heater is located above the kneader,
Since the bottom of the kneading device is in direct contact with the bottom of the heating chamber, the heating of the bottom and top portions of the dough placed in the kneading device becomes uneven.

There were problems like.

The purpose of the present invention is to solve the above problems and improve usability.

An object of the present invention is to provide a high-frequency heating device with a stirring function that is easy to clean and has a good finish.

(Means for Solving the Problems) The high-frequency heating device of the present invention includes a heating chamber that uses a high-frequency oscillator, an upper flat heater, and a lower heater as heating sources, and has at least a bottom surface made of a non-magnetic metal plate.

A circulation blower is installed on the outside of the side wall of the heating chamber to create forced convection within the heating chamber, and a bread container is used to perform everything from kneading bread ingredients to baking within the heating chamber.

In order to hold the bread container on the bottom surface of the heating chamber, a fixing claw is provided on the outer surface of the lower part of the support stand fixed to the bottom of the bread container, and a hook piece is fixed to the bottom surface of the heating chamber and engages with the fixing claw. , a permanent magnet attached to the inner surface of the lower part of the support base, a first drive shaft that drives the kneading blades in the bread container through the through hole in the bottom of the heating chamber, and a radio wave seal provided around this drive shaft. A magnetic sensing element is attached to the side wall of the cavity resonator, and a magnetic sensing element is operated by the magnetic field from the nine permanent magnets to detect attachment and detachment of the bread container.

Further, the lower heater is disposed in a recess in the bottom of the heating chamber and is located below the bottom of the bread container. Further, an upper plane heater is disposed above the upper surface of the heating chamber.

(for production) With the above configuration.

(a) The bread container can be fixed in the heating chamber by engaging the fixing claws provided on the outer surface of the lower part of the support base fixed to the container with the hooks fixed to the bottom of the heating chamber. There is no need to make a hole in the bottom of the heating chamber.

(b) The attachment and detachment of the bread container is detected by a magnetic sensing element that responds to the magnetic field transmitted through the bottom of the heating chamber from a permanent magnet attached to the inner surface of the lower part of the support base of the bread container fixed in the heating chamber. There is no need to provide a detection hole in the bottom of the chamber.

(C) The upper flat heater placed above the top of the heating chamber and the lower heater placed in the recess at the bottom of the heating chamber are used to prevent the heater from getting in the way when the bread container is attached or removed. The effective space, especially the height, can be increased.

(d) Two-stage cooking is possible by forcing thermal energy from the upper plane heater and the lower heater to be forced into convection by a circulation blower installed outside the side wall of the heating chamber. This is convenient for carrying out the primary fermentation of sweet bread, pizza, etc. in a bread container, and then dividing the container into two stages and baking them simultaneously. This is because the internal volume of the bread container is quite large, and the secondary fermentation
This is because the volume increases during the baking process, making it increasingly necessary to bake in two stages at the same time.

(e) When using a bread container, the lower heater is mainly used to perform primary fermentation, secondary fermentation, and baking, but since the lower heater 8 is located lower than the bottom of the bread container, natural convection and radiation are used to improve the dough. The top and bottom can be heated evenly.

(f) The permanent magnet is attached to the lower inner surface of the support base so that the hook piece does not get in the way when the bread container is rotated at a predetermined angle to fix the bread container, so the permanent magnet can be installed close to the bottom of the heating chamber. becomes possible. Therefore, the magnetically sensitive element can be brought to a position where the temperature during heating by the heater is lower, which is further away from the bottom of the heating chamber, and an element with a lower operating temperature rating can be used.

(g) Since the magnetic sensing element is attached to the side wall of the cavity resonator, the number of attachment parts can be reduced.

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

First, a description will be given of FIG. 4, which is a schematic cross-sectional view when the high-frequency heating device of the present invention is used as an automatic bread machine (home bakery).

With reference to this diagram, one device will be divided into five components according to function and explained. That is, the first component is related to high frequency heating, the second is related to heater heating, the third is related to bread container, the fourth is related to rotation drive unit, and the sixth is related to outer shell. However, the number of members for attaching each element and auxiliary electrical parts shall be kept to the minimum necessary. Each component will be explained below.

The components related to high frequency heating will be explained.

Reference numeral 1 denotes a heating chamber surrounded by a metal plate that reflects high frequency energy and is provided in a high frequency heating device. At least the bottom of this heating chamber 1 is a non-magnetic metal plate.

For example, it is made of 5US304. Reference numeral 2 designates a high frequency oscillator 2, such as a magnetron, which supplies high frequency energy into the heating chamber 1 through a waveguide 3. 4 is a coupling port between the waveguide 3 and the heating chamber 1, from which high frequency energy is irradiated into the heating chamber 1. 6 is a cooling blower for cooling the high frequency oscillator 2.

The components related to heater heating will be explained.

Reference numeral 6 denotes an upper plane heater attached to the upper side of the upper surface of the heating chamber 1. 7 is a heat insulating material that prevents heat from escaping to the top so that the heat from the upper flat heater 6 is efficiently irradiated into the heating chamber 1 through the upper surface of the heating chamber 1. A lower heater 8 is disposed in the recess 1b in the bottom of the heating chamber 1 and located below the bottom of the bread container 11. The upper flat heater 6 is used for grilled food, or is alternately energized with the lower heater 8 and used for general oven cooking. The lower heater 8 is used for the primary fermentation, secondary fermentation, baking, etc. when the bread container 11 is used by intermittently heating the bread container 11 as needed. When the bread container 11 is used, not only the lower heater 8 but also the upper flat heater 6 may be used auxiliary. Reference numeral 9 denotes a circulation blower attached to the outside of the side surface of the heating chamber 1 in order to force convection of thermal energy from the upper flat heater 6 and the lower heater 8 within the heating chamber 1. 1d is the suction port of the circulation blower 9.

1C is an air outlet. 1o is a circulation chamber that houses a circulation blower 9.

The components related to bread containers will be explained.

Reference numeral 11 denotes a bread container in which at least one side of the inlet is made of a metal molded product such as aluminum whose high frequency energy is larger than 1/2 of the wavelength used, or a dielectric molded product such as Pyrex that transmits high frequency waves.

12 is a support stand fixed to the lower part of this container 11. To fix the bread container 11 in a predetermined position, the bread container 11 is rotated by a predetermined angle, and the fixing claw 13 provided on the outer surface of the lower part of the support base 12 is engaged with the hook piece 14 fixed to the bottom surface of the heating chamber 1. match. Reference numeral 16 indicates a bread raw material consisting of wheat flour, water, yeast, etc., and FIG. 4 shows the so-called mountain-shaped bread cross-sectional shape after baking. 16 kneads bread ingredients 16,
It is a kneading blade for releasing gas. Reference numeral 17 is a rotating shaft that detachably supports the kneading blade 16 and rotates it once. 18
is an oil seal made of silicone rubber or the like. 19
is a bearing that rotatably supports the rotating shaft 17. Reference numeral 20 is a driven piece whose upper part is fixed to the rotation shaft 17 and whose lower part engages to form one side of the clutch.

Components related to the rotation drive section will be explained.

Reference numeral 21 denotes a drive piece whose upper part engages with the driven piece 2o through the through hole 1a of the heating chamber 1 to form one side of a dog clutch, and whose lower part is a first drive shaft connected to a large pulley 22. be. A belt 23 rotatably connects the large pulley 22 and the small pulley 24. 26 is kneading feather 1
A kneading motor connected to a small pulley 24 rotates the kneading blades 16 at a high speed of, for example, about 20 rpm. Reference numeral 26 denotes a cavity resonator that takes in high frequency energy that would otherwise leak out of the heating chamber 1 along the drive shaft 21 and prevents it from being released.

A first drive shaft 21 is provided on the wall surface of the central hollow part of the resonator 26.
A bearing (circuit) is fitted to support the motor so that it can rotate freely.

The components related to the outer shell will be explained.

27 is an outer box made of a conductor. Reference numeral 28 denotes a door that opens and closes the front entrance of the heating chamber 1, and is used to minimize the release of high frequency energy and heater thermal energy to the outside during heating. Reference numeral 29 is a control panel for selecting a bread baking sequence as an automatic bread maker, or a heating operation as an oven range or single-function microwave oven.

3o is a leg that separates the entire device from the installation surface and prevents damage to the installation surface.

Next, a schematic sectional view of the case where components related to the rotational movement of the object to be heated 31 are set in the heating chamber 1 instead of the components related to the bread container shown in FIG. 4 and used as a single-function microwave oven. FIG. 5, which shows the following, will be explained.

32 is a turntable on which the object to be heated 31 is placed and moved one rotation. Reference numeral 33 denotes a rotary table that detachably supports the turntable 32 and rotates it once.

34 is a second drive shaft that detachably supports and drives the rotary table 33. 36 is a second drive shaft 34 and a plurality of gears (circuits)
For example, the turntable 32 is
This is a table motor that rotates at a low speed of ~10rl)m. Note that the second drive shaft 34 passes through the central axis of the first drive shaft 21.

Both shafts 34.21 are adapted to rotate independently of each other.

Next, a description will be given of FIG. 6, which is a schematic cross-sectional view when thermal energy from the upper plane heater 6 and the lower plane heater 8 is forced to convect within the heating chamber 1 by the circulation blower 9.

32a is a turntable with legs that is used by placing it on the turntable 32 in the case of two-stage cooking.

In the case of sweet bread, pizza, etc., the dough is kneaded to primary fermentation in a bread container 11, formed into nine pieces, placed on a turntable 32 and a turntable with feet 32a, and subjected to secondary fermentation and baking.

The volume after firing expands by about 2 to 3 times the initial volume.

The internal volume of the bread container 11 is approximately 21 for one loaf of bread! .

About 31 for 1.5 loaves! Quite a lot. Therefore, with 11 bread containers, it is possible to prepare just the right amount of dough for two-stage cooking using the turntable 32 and the turntable with legs 32a, from kneading to primary fermentation, making it extremely convenient to use.

Next, a description will be given of FIG. 1, which shows a detection means for detecting attachment and detachment of the bread container 11 and an enlarged cross-sectional view of a main part of its mounting structure.

36 is a column 12a extending downward from the upper surface of the support base 12
This is a permanent magnet attached to the inner surface of the lower part of the support base 12 with a stop pin 37. This permanent magnet 36 faces the magnetically sensitive element 38 via the bottom surface of the heating chamber 1 . The magnetically sensitive element 38 is a reed switch in which a contact portion connected to two ferromagnetic leads is sealed together with an inert gas in a glass tube.

'It is a Hall element whose resistance value changes depending on the magnetic field.

In this embodiment, a case is shown in which the element 38 is a reed switch.

Reference numeral 39 denotes a mounting bracket made of a non-magnetic metal body and having a recess with a U-shaped cross section for accommodating a magnetically sensitive element wrapped in an insulating material 40. This metal fitting 39 is fixed to the side wall 26a inside the cavity resonator 26 with mounting screws 41 and 42. 4
Reference numeral 3 denotes a leader line that connects the element 38 to a control circuit (circuit).

Next, a description will be given of FIG. 2, which is a cross-sectional view of the vicinity of the storage portion of the magnetically sensitive element 38 as viewed from the AB force direction in FIG. 1.

When the magnetic sensing element 38 is a reed switch as in this embodiment, in order to maximize the sensitivity, the switch 38
The axial direction of the glass tube and the north-south pole arrangement direction of the permanent magnet 36 are made almost parallel, and both directions of 38° and 36 are parallel to the heating chamber 1.
Place it so that it is almost parallel to the bottom surface of the

Next, FIG. 3 showing an enlarged perspective view of the insulating material 4o will be described.

40a is a tube storage recess into which a glass tube is fitted.

Reference numerals 40b and 40C are recesses for accommodating the connection portions that are shallower than the recess 40a, and are for storing the connection portions between the ferromagnetic leads coming out from both ends of the glass tube and the connection lead wires 43.

40d and 40e are outlets for connecting lead wires 43. 40f is a protrusion that comes into contact with the side wall 26a. The reed switch 38 is sandwiched between the two sides of the insulating material 4o, and inserted into the recess of the mounting bracket 49. Alternatively, the insulating material 4o may be integrally molded in such a manner that a pair of insulating materials 4o are placed back to back on the side opposite to the protrusion 40f and can be opened and closed. The insulating material 4o is made of silicone rubber molded material, and after the reed switch 38 is housed, the outer surface is coated with silicone adhesive to prevent moisture from coming into contact with the ferromagnetic lead and the conductor part of the connection lead wire 43 to increase durability. will improve.

The functions and effects of the above configuration will be described.

Due to the following (a), (b), (C), and (d), the harmonic heating device of the present invention is easy to use and easy to clean.

(a) To fix the bread container 11 to the bottom surface of the heating chamber 1, engage the fixing claw 13 provided on the lower outer surface of the support base 12 attached to the bread container 11 with the hook piece 14 fixed to the bottom surface of the heating chamber 1. Because you can.

There is no need to make a hole for fixing the bread container in the bottom of the heating chamber 1.

(b) The attachment and detachment of the bread container 11 is detected by a magnetic sensing element that responds to the magnetic field transmitted through the bottom surface of the heating chamber 1 from the permanent magnet 36 attached to the inner surface of the lower part of the support base 12 of the bread container 11 fixed in the heating chamber 1. 38, there is no need to make a detection hole in the bottom of the heating chamber 1.

(C) In order to facilitate attachment and detachment of the bread container 11, an upper plane heater 6 is disposed above the upper surface of the heating chamber 1.

A lower heater 8 is disposed within a recess 1b in the bottom surface of the heating chamber 1. This arrangement of the heater 6.8 increases the effective space within the heating chamber 1, particularly the height.

(d) If you use the 11-cup bread container to process the dough for pastries, pizza, etc. from kneading to primary fermentation, you can handle just the right amount of dough for two-stage cooking.

A circulation blower 9 provided on the outside of the side wall of the heating chamber 1 causes forced convection of thermal energy from the upper flat heater 6 and the lower heater 8 to generate the turntable 32 and the turntable with feet 3.
2a enables two-step cooking.

The following (e) improves the finished product when the bread container 11 is used.

(e) In order to uniformly heat the upper and lower parts of the bread dough when the bread container 11 is used, the lower heater 8, which is mainly used when the bread container 11 is used, is arranged at a position lower than the bottom surface of the bread container 11, and heat is generated by natural convection and radiation. Energy is bread container 11
We try to ensure that the information is transmitted evenly. In addition, since a home bakery that is integrated with a microwave oven generally has a larger heating chamber than a dedicated home bakery, there is more leeway in selecting the spatial distance between the bread container 11 and the lower heater 8. It is easy to reduce uneven heating.

Furthermore, the following (f) and (g) make the operating temperature conditions of the magnetically sensitive element 38 that detects the attachment and detachment of the bread container 11 advantageous, and the cost of the mounting member can be reduced0 (f) Generally, the operating temperature rating is low. In order to facilitate the adoption of the magnetically sensitive element 38, a permanent magnet 36 is attached to the inner surface of the lower part of the support base 12 so that the hook piece 14 does not get in the way when the bread container 11 is rotated at a predetermined angle when the bread container 11 is fixed. The magnetic sensing element 38 can be moved closer to the bottom surface.
The heating chamber 1 can be brought to a position away from the bottom surface of the heating chamber 1 where the temperature is low during heating.

(g) In order to reduce the number of mounting members for the magnetically sensitive element 38, the element 38 is attached to the side wall 26a of the cavity resonator 26.

Furthermore, in order to effectively use the space in the height direction within the heating chamber 1, it is preferable that the position of the contact surface between the support stand 12 and the bottom surface of the heating chamber 1 be as low as possible. therefore.

If holes are made in this contact surface, a large amount of food particles and liquid juice will easily flow down, which is not desirable.

On the other hand, there is a through hole 1a on the bottom surface of the heating chamber 1 through which the dog clutch part passes, and the vicinity of this hole 1a is made convex to prevent food particles and liquid juice from flowing down.

In addition, according to the present invention, when a cooking container detects a stick stuck in the heating chamber, a control circuit centered on a microcomputer controls the sequence from kneading bread to baking, as well as sweet bread.

It is applied to high-frequency heating equipment that automatically selects the sequence for cooking pizza, mochi, rice, etc. from a control panel.

(Effects of the Invention) According to the present invention, an automatic bread maker (home bakery), a microwave oven,
Multi-function such as a single-function microwave oven.

It is possible to provide a high frequency heating device having the following.

Furthermore, the operating temperature conditions of the magnetically sensitive element for detecting the bread container can be made favorable, and the cost of the mounting member for the element can be reduced.

[Brief explanation of the drawing]

Fig. 1 is an enlarged cross-sectional view of the essential parts showing the detection means of the bread container and its mounting structure, and Fig. 2 is a cross-sectional view showing the storage state of the magnetically sensitive element (reed switch) viewed from the direction of arrow AB in Fig. 1. Fig. 3 is an enlarged perspective view showing the shape of the insulating material surrounding the magnetically sensitive element, and Fig. 4 is a sectional view of the main parts when the high-frequency heating device of the present invention is used as an automatic bread maker. in. FIG. 6 is a cross-sectional view of the main parts when the microwave oven is used as a microwave oven or a single-function microwave oven, and FIG. 6 is a cross-sectional view of the main parts when the microwave oven is used for two-stage cooking using hot air. DESCRIPTION OF SYMBOLS 1... Heating chamber, 1a... Through hole, 1b... Recess, 2... High frequency oscillator, 6... Upper plane heater, 8... Lower plane heater, 11... Bread container, 1
2...Support stand. 13...Fixing claw, 14...Hook piece, 15...
- Bread raw material, 16... Kneading blade, 21:... First drive shaft, 26... Cavity resonator, 26a... Side wall, 36...
·permanent magnet. 38... Magnetic sensing element (reed switch), 9...
Circulating blower.

Claims (3)

[Claims] (1) A heating chamber (1) whose heating sources include a high frequency oscillator (2), an upper flat heater, and lower heaters (6) and (8), and whose bottom surface is made of a non-magnetic metal plate;
1) A circulation blower (9) installed on the outside of the side wall of the heating chamber (1) to create forced convection inside the chamber, and a bread container (1) that performs everything from kneading to baking of bread ingredients (15) within the heating chamber (1). 11) and this bread container (11) into the heating chamber (1).
A fixing claw (13) is provided on the outer surface of the lower part of the support stand (12) fixed to the lower part of the bread container (11) in order to hold it on the bottom surface of the bread container (11).
) and the bottom of the heating chamber (1), and the fixing claw (1)
3), and a hook piece (14) that engages with the support base (1).
A first drive shaft (2) that drives the permanent magnet (36) attached to the lower inner surface of the bread container (11) and the kneading blades (16) in the bread container (11) through the through hole (1a) in the bottom of the heating chamber (1). 21) and a cavity resonator (26) for radio wave sealing provided around the drive shaft (21), and is operated by the magnetic field from the permanent magnet (36) to attach and detach the bread container (11). A high frequency heating device characterized in that a magnetic sensing element (38) for sensing is attached to a side wall (26a) of the cavity resonator (26). (2) Connect the lower heater (8) to the recess (1) on the bottom of the heating chamber (1).
The high-frequency heating device according to claim 1, wherein the high-frequency heating device is disposed within the bread container (11) and is located below the bottom surface of the bread container (11). (3) The high-frequency heating device according to claim 1, wherein the upper plane heater (6) is disposed above the upper surface of the heating chamber (1).