JPH028618A - High frequency heating device - Google Patents

Abstract

PURPOSE:To improve a convenience in use of a device having a food agitating function by a method wherein a permanent magnet is arranged at a lower inner surface of a supporting table for use in fixing a bread container to a heating chamber and a magnetic sensitive element is arranged below a bottom surface of the heating chamber. CONSTITUTION:A supporting table 12 for supporting a bread container 11 at a bottom surface of a heating chamber 1 is arranged at a lower part of the bread container 11 and then a permanent magnet 36 is arranged at a lower inner surface of it. In turn, a magnetic sensitive element 38 is arranged at a lower part of the bottom surface of the heating chamber 1 and a permanent magnet 36 is opposed through a bottom surface of the heating chamber 1. With this arrangement, when the bread container 11 is fixed through an engagement between a fixing claw 13 and a hook piece 14 at bottom surface of the heating chamber 1, the magnetic sensitive element 38 may be operated with a magnetic field of the permanent magnet 36. Its operating signal is taken out to a control circuit not shown by a line 43 and then a fixing or removal of the bread container is detected. In this way, the convenience in use of the device can be improved.

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 and lower heater are built into 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.
The kneader 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 when the kneader is attached or detached. This hole is also used to secure the kneader to the bottom of the heating chamber. During this fixation.

Since it is necessary to insert the fixing piece into the hole and rotate it by a predetermined angle, 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.

([)] Both the upper and lower heaters are inside the heating chamber, so they get in the way when you put in and take out the kneading machine.

Moreover, the effective space in the heating chamber, especially the height, becomes smaller.

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 crystallized glass tube 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, and fixing claws provided on the lower outer surface of a support base fixed to the lower part of the bread container to hold this bread container on the bottom surface of the heating chamber.

a hook piece that is fixed to the bottom surface of the heating chamber and that engages with the fixing claw; and a permanent magnet that is attached to the inner surface of the lower part of the support base;
The device is equipped with a magnetically sensitive element that is activated by the magnetic field from the permanent magnet that passes through the bottom of the heating chamber to detect attachment and detachment of the bread container.

In addition, two upper crystallized glass tube heaters are installed.

They are placed on the front and back sides of the bread container, respectively, from directly above the center of the top. 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.

(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 at the bottom of the heating chamber.

(b) The attachment and detachment of the bread container is detected by a magnetically sensitive element that responds to the magnetic field transmitted through the bottom surface 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 on the bottom of the chamber.

(c) Using the upper crystallized glass tube heater housed in the upward recess on the top of the heating chamber and the lower heater placed in the recess on the bottom of the heating chamber, the heater does not get in the way when the bread container is attached or removed. (d) When bread is baked in a bread container, the center of the top of the bread approaches the top of the heating chamber due to expansion.

The upper crystallized glass tube heater is placed so as to avoid directly above the center of the top of the bread container, and the heat energy is dispersed back and forth from the center of the top of the bread container, resulting in a good finished product with less burnt bits. can get.

(e) 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 when fixing the bread container, so the permanent magnet should 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.

(Example) 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 maker (home bakery).

With reference to this figure, the two 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.

High frequency heating related components 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. O2 heater heating related components will be explained.

6 is an upper crystallized glass tube heater with a coiled heating wire inserted into a crystallized glass (product name: Miraclon) tube, which is a type of ceramic that has excellent corrosion resistance against salt and oil contained in foods that are scattered during cooking. It is. The upper crystallized glass tube heater e is divided into two pieces, and upward recesses (1b) and (1c) are provided on the upper surface of the heating chamber 1, which are located on the front side and the rear side of the upper center of the bread container 11, respectively. stored inside.

It is arranged so as not to protrude below the upper surface of the heating chamber 1. 7a and 7b are trapezoidal wall surfaces for forming recesses 1b and 1c, respectively. Reference numeral 8 denotes a lower heater disposed within the recess 1d in the bottom of the heating chamber 1 and mounted so as to be located below the bottom of the bread container 11.

Bread container related components will be explained.

Reference numeral 11 denotes a bread container made of a metal molded product such as aluminum whose inlet side has at least one side larger than 1/2 of the wavelength used for high-frequency energy, 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. 15 is flour,
It is a bread ingredient consisting of water, yeast, etc., and Fig. 4 shows the cross-sectional shape of so-called mountain-shaped bread after baking.

15 is a kneading blade for kneading the bread raw material 15 and degassing it. Reference numeral 17 denotes a rotating shaft that detachably supports the kneading blade 15 and rotates it once. 18 is an oil seal made of silicone rubber or the like. Reference numeral 19 denotes a bearing that rotatably supports the rotating shaft 1. 2° is a driven piece whose upper part is fixed to the rotating shaft 17 and whose lower part engages and forms one side of the clutch.

The rotation drive unit related components 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 10 to form one side of a dog clutch, and whose lower part is a first drive shaft connected to a large pulley 22. . 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 15 at a high speed of about 200 rpm, for example.

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 bearing (circuit) that rotatably supports the first drive shaft 21 is mounted on the wall of the central hollow part of the resonator 26.
is embedded.

The outline related components 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 the outside of the heater 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 open range or a 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 cross-section of the case where components related to the rotational movement of the object to be heated 310 are set in the heating chamber 1 instead of the components related to the bread container shown in FIG. 4 and used as an open range or a single-function microwave oven. 6, which shows the diagram, 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 twice. 34 is a second drive shaft that detachably supports and drives the rotary table 33. 35 is a table motor connected to the second drive shaft 34 via a plurality of gears (circuits) and rotates the turntable 32 at a low speed of, for example, 6 to 10 rpm. The second drive 11III 134 passes through the central axis of the first drive shaft 21, so that the two cars and one bolt rotate 34 degrees 21 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 3θ faces the magnetically sensitive element 38 via the heating chamber 1. The magnetically sensitive element 38 is, for example, a reed switch in which a contact portion connected to two ferromagnetic leads is sealed in a glass tube together with an inert gas, or a Hall element whose resistance value changes depending on a 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 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 by mounting screws 41, 42. 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 housing portion of the magnetically sensitive element 38 as viewed from the direction Art in FIG. 1. When the magnetic sensing element 38 is J-type as in this embodiment, in order to maximize the sensitivity, the glass tube axis direction of the switch 38 and the NS pole arrangement direction of the permanent magnet 36 are made almost parallel, and both are parallel to each other. 38 and 36 are arranged so that both directions are substantially parallel to the bottom surface of the heating chamber 1.

Next, FIG. 3 showing an enlarged perspective view of the insulating material 40 will be described.

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

40t) 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 40c are outlet ports for the leader line 43. 40
f is formed with the same mold, and the two are put together to form the reed switch 3.
This is a protrusion that is inserted into the other matching hole 40g when storing it. That is, the insulating materials 40 are placed in pairs so as to surround the reed switch 38 and the connecting portion, and inserted into the recesses of the mounting bracket 39. Or insulation material 40
The openings may be integrally molded with a pair of openings 40d and 40c placed back to back on the side opposite to the bow exits 40d and 40c so that they can be opened and closed. In this case, the protrusion 40f and the alignment hole 40g are unnecessary. The insulating material 40 is made of a silicone comb molded product, 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 lead wire 43, improving durability. do.

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

Due to the following (a), (h), (C), and (d), the high frequency heating device of the present invention is easy to use, easy to clean, and has a good finish.

(a) To fix the bread container 11 to the bottom of the heating chamber 1.

A hook piece 14 fixes a fixing claw 13 provided on the lower outer surface of the support stand 12 attached to the bread container 11 to the bottom of the heating chamber 1.
The hole for fixing the bread container should be in the heating chamber 1.
There is no need to open it to the bottom.

fb) The attachment and detachment of the bread container 11 is detected by a magnetic sensing element 38 that responds to the magnetic field transmitted through the bottom surface of the heating chamber 1 from a 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. Therefore, there is no need to make a detection hole at the bottom of the heating chamber 1.

(c) Easily attaching and detaching the bread container 11 and heating chamber 1
In order to increase the effective space, especially the height, the upper crystallized glass tube heater 6 is housed in the upward recesses 1b and lc provided on the top surface of the heating chamber 1.

A lower heater 8 is disposed in a recess 1d on the bottom of the heating chamber 1.

(d) When bread is baked in the bread container 11, the top center of the bread approaches the top surface of the heating chamber 1 due to expansion. The upper crystallized glass tube heater 6 is arranged to avoid this.

In addition, thermal energy is dispersed back and forth with respect to the upper center of the bread container 11.

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. The magnet 36 can be brought close to the bottom surface of the heating chamber 1, and the l-J magnetic sensing element 3
8 can be brought to a position where the temperature during heating by the heater is low, away from the bottom of the heating chamber 1.

In addition, in order to effectively use the space in the height direction inside the heating chamber 1, it is better that the position of the contact surface between the support stand 12 and the bottom of the heating chamber 1 be as low as possible. If holes are made, a large amount of food particles and liquid juices 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 interlocking flange portion passes, and the vicinity of this hole 1a is formed into an upward convex shape to prevent food particles and liquid juice from flowing down.

2. When the present invention detects that a cooking container is fixed in the heating chamber, a control circuit centered on a microcomputer controls the sequence from kneading to baking a single loaf of bread, as well as rice cake, rice cooking, sweet bread, and pizza. Applicable to high-frequency heating equipment that is automatically selected from a sequential control panel such as

(Effects of the Invention) According to the present invention, there is an automatic bread maker (home bakery) that is easy to use, easy to clean, and has a good finish.
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. 6 is a sectional view of the main part when used as a microwave oven or a single-function microwave oven. 1.° heating chamber, 1b, 1c, 1d...dent, 2
...High frequency oscillator, 6... Upper crystallized glass tube heater 8... Lower heater, 11°° bread container, 12.
・Support stand, 13・Fixing claw, 14・Hook piece, 1
5. Bread ingredients.

Claims (1)

[Scope of Claims] (1) A heating chamber in which a high-frequency oscillator (2), an upper crystallized glass tube heater, and lower heaters (6) and (8) are used as heat sources, and at least the bottom surface is made of a non-magnetic metal plate. (1), a bread container (11) in which bread ingredients (15) are kneaded and baked in this heating chamber (1), and this bread container (1).
1) to hold the bread container (
A fixing claw (13) provided on the outer surface of the lower part of the support base (12) fixed to the lower part of the heating chamber (11), and a hook that engages with this fixing claw (13) and fixed to the bottom surface of the heating chamber (1). piece (14) and a permanent magnet (
36) and the bread container (11) operated by the magnetic field from the permanent magnet (36) that passes through the bottom of the heating chamber (1).
) A high-frequency heating device characterized by comprising a magnetically sensitive element (38) for detecting attachment and detachment of the device. (2) Two upper crystallized glass tube heaters (6),
An upward recess (1b) provided on the top surface of the heating chamber (1), respectively.
), (1c). (3) The high-frequency heating device according to claim (2), wherein the recesses (1b) and (1c) are respectively located on the front side and the rear side of the upper center of the bread container (11). (4) Connect the lower heater (8) to the recess (1) on the bottom of the heating chamber (1).
d) and located below the bottom of the bread container (11).