JPH01266436A - High frequency heating device - Google Patents

Abstract

PURPOSE:To prevent a heating element from being a hindrance when a bread container is mounted and demounted and to increase the effective space of the interior of a heating chamber, especially the height thereof being increased thereby, by a method wherein a high frequency oscillator, an upper positioned heater, and lower heater form a heating source, and the lower heater is placed in the recessed part of the bottom of a heating chamber and in a level lower than that of the bottom of a bread container. CONSTITUTION:A high frequency oscillator 2, an upper flat heater 6, and a lower heaters 8 form a heating source. In order to facilitate the mounting and demounting of a bread container 11, the upper flat heater 6 is disposed on the upper surface side of a heating chamber 1, and the lower flat heater 8 is disposed in a recessed part 1b of the bottom of the heating chamber 1. Arrangement of the heaters 6 and 8 increases the effective space of the interior of the heating chamber 1, especially the height thereof.

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 was developed in Japanese Utility Model Publication No. 61-423
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 contacts 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 second 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. may flow out from this hole, causing an inconvenience.

(b) The upper heater is placed downwardly from the top surface of the heating chamber, and the lower heater gate 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 The effective space, especially the height, is reduced.

(C) Since the lower heater is located above the bottom of the kneader and the bottom of the kneader is in direct contact with the bottom of the heating chamber, uneven heating of the bottom and top of the bread dough placed in the kneader may occur. Becomes large.

There were problems like this.

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

It is an object of the present invention 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 bread container that performs everything from kneading bread ingredients to baking in this heating chamber, a fixing claw provided on the outer surface of the lower part of a support base fixed to the bottom of the bread container to hold this bread container on the bottom surface of the heating chamber, and and a hook piece that is fixed to the bottom of the chamber and engaged 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 a through hole in the bottom of the heating chamber, and a cavity for 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 permanent magnet 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) When using a bread container, the lower heater is mainly used for 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 cause the upper part of the dough to rise. The lower part can be heated evenly.

(e) The permanent magnet is attached to the inner surface of the lower part of the support base so that the hook piece does not get in the way when the bread container is rotated by a predetermined angle when fixing 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.

(f) 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, FIG. 4, which is a schematic cross-sectional view when the high-frequency heating apparatus of the present invention is used as an automatic bread maker (home bakery), will be described.

With reference to this diagram, the nine devices 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 8US304. Reference numeral 2 designates a high frequency oscillator 1, 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 on the bottom of the heating chamber 1 and located below the bottom of the bread container 11. The upper plane 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. Depending on the food, not only the lower heater 8 may be used when using the bread container 11.
The upper plane heater 6 may be used supplementarily.

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 secure the bread container 11 in place, the bread container 11
A hook piece 14 is fixed to the bottom surface of the heating chamber 1 by rotating it by a predetermined angle to fix the fixing claw 13 provided on the outer surface of the lower part of the support base 12.
engage with. Reference numeral 15 indicates a bread raw material consisting of wheat flour, water, yeast, etc., and FIG. 4 shows the cross-sectional shape of the so-called mountain-shaped bread after baking. 16 is a kneading blade for kneading the bread raw material 16 and degassing it. Reference numeral 17 is a rotating shaft that detachably supports the kneading blade 16 and rotates it once. 1
8 is an oil seal made of silicone rubber or the like. 1
Reference numeral 9 denotes a bearing that rotatably supports the rotating shaft 17. 2o
is a driven piece whose upper part is fixed to the rotary shaft 17 and whose lower part is engaged and forms 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 20 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. 26 is the heating chamber 1 along the drive shaft 21
It is a cavity resonator that captures high-frequency energy that would otherwise leak out 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 outline 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.

Reference numeral 30 is a leg for separating the entire device from the installation surface and preventing damage to the installation surface.

Next, components related to the rotational movement of the object to be heated 31 are placed in the heating chamber 1 instead of the components related to the bread container shown in FIG. FIG. 6, which shows a schematic cross-sectional view, will be explained.

32 is a turntable on which the object to be heated 31 is placed and moved twice. 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. 35 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 ~1 orpm. 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. 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.

These are Hall elements, etc. whose resistance value changes depending on the boundary.

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 the magnetically sensitive element 38 wrapped in an insulating material 4o. This metal fitting 39 is fixed to the side wall 26a inside the cavity resonator 26 with mounting screws 41 and 42.

Reference numeral 43 is 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 and south pole arrangement direction of the permanent magnets 36 are approximately 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.

40b and 40C are the places where the connection parts between the ferromagnetic leads coming out from both ends of the glass tube and the lead wire 43 are housed.

This is a connection portion storage recess that is shallower than the recess 40a.

40d and 40e are outlet ports for the leader line 43. 4o
f is formed with the same mold, and the two are put together to form the reed switch 3.
8 is a protrusion that is inserted into the other matching hole 40g when storing it. That is, two insulating materials 40 are housed in pairs so as to surround the reed switch 38 and the connecting portion, and inserted into the recess of the mounting bracket 39. Or insulation material 40
may be integrally molded in such a manner that a pair of two pieces are placed back to back on the side opposite to the outlet ports 4Qd and 40e and can be opened and closed. In this case, the projection aof and the alignment hole 40g are unnecessary. The material of the insulation material 4o is a silicone rubber molded product.

After reed switch 38 is stored, the outer surface is coated with silicone adhesive to prevent moisture from ferromagnetic lead and lead wire 43.
Durability will improve if you avoid touching the conductor part.

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

Due to the following (a), (b), and (C), 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 flat heater 6 is disposed above the upper surface of the heating chamber 1, and a lower flat heater 8 is disposed within the recess 1b at the bottom of the heating chamber 1. This arrangement of the heater 6.8 increases the effective space within the heating chamber 1, particularly the height.

The following (d) improves the quality of the finished product when the bread container 11 is used.

(d) In order to uniformly heat the upper and lower parts of the 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. The energy is uniformly transmitted to the bread container 11.

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 operating temperature conditions of the magnetically sensitive element 38 for detecting attachment and detachment of the bread container 11 are made advantageous due to the following (e).

(e) In order to facilitate the adoption of a magnetic sensing element 38 that generally has a low operating temperature rating, 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 fixed and rotated by a predetermined angle. Therefore, the magnet 36 can be brought close to the bottom surface of the heating chamber 1, and the magnetically sensitive element 38 can be brought to a position where the temperature is lower when heating the heater, which is further away from the bottom surface of the heating chamber 1.

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 scraps and liquid juice will easily flow down, which is not preferable.

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

In addition, in the present invention, when it is detected that a cooking container is fixed in the heating chamber, a control circuit centered on a microcomputer controls the sequence from kneading to baking bread, 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,
A high-frequency heating device having multiple functions such as a single-function microwave oven can be provided.

Furthermore, the operating temperature conditions for the magnetically sensitive element that detects the bread container are favorable.

[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. 5 is a sectional view of main parts when used as a microwave oven or a single-function microwave oven. 1... Heating chamber, 1b... Recess, 2... High frequency oscillator. 6...Top plane heater, 8...Bottom heater, 11...
・・Bread container, 12・・Support stand, 13・・Fixing claw,
14...Hook piece, 16...Bread ingredients, 36...
·permanent magnet. 38... Magnetic sensing element (reed switch-7-).

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 bread container (11) in which the bread ingredients (15) are kneaded and baked; a fixing claw (13) provided on the outer surface of the lower part of the fixed support base (12); a hook piece (14) that engages with the fixing claw (13) and is fixed to the bottom surface of the heating chamber (1); A permanent magnet (36) attached to the lower inner surface of the support base (12) and a permanent magnet (36) that passes through the bottom of the heating chamber (1).
A high-frequency heating device characterized by comprising: a magnetic sensing element (38) which is operated by a magnetic field from the bread container (11) to detect attachment/detachment of the bread container (11). (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).