JPH01256722A - Microwave oven - Google Patents

Abstract

PURPOSE:To improve an operating characteristic, convenience in use and a cleaning characteristic and the like by a method wherein a magnetic sensitive element for detecting a fixing or a removal of a bread container is enclosed by an insulation material, fixed to a side wall of a cavity resonator, a pair of insulation materials having the same shape to each other are enclosed by interlaying the magnetic sensitive element and its connection part. CONSTITUTION:A fixing or a removal of a bread container 11 is detected by a magnetic sensitive element 38 responding to a magnetic field passing through a bottom surface of a heating chamber 1 from a permanent magnet 36 fixed to an inner surface of a lower part of a supporting table 12 of the bread container 11 fixed within the heating chamber 1. When a heating with a heater is carried out, the container is increased up to its high temperature through its thermal conduction, resulting in that the magnetic sensitive element 38 is required to perform a thermal insulation and an electrical insulation in respect to a cavity resonator 26. Then, the magnetic sensitive element 35 is enclosed by an insulation material. In order to improve a storing control of the insulation material 40 and its assembling operation, a pair of two insulation materials 40 having the same shape to each other are applied to interlay the magnetic sensitive element 38 and its connection part. In addition, in order to attain efficient reaching of a magnetic field from the permanent magnet 36 to the magnetic sensitive element 38, the supporting table 12, the bottom surface of the heating chamber 1 and the cavity resonator 26 are made of non-magnetic metallic material.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a high frequency heating device having a food hiding function.

2. 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 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 touches the actuator of a microswitch installed 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.

Problems to be Solved by the Invention According to the above-mentioned 4Mr. (a) A hole is provided in the bottom of the heating chamber to detect attachment and detachment of the kneader. 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 turn it through a predetermined angle ψ1, so the hole has to be large. Therefore, there is a strong possibility that a large amount of food particles, liquid liquid, etc. may flow out from this hole.

(b) Since both the upper heater and the lower heater are located within the heating chamber, they become a nuisance when the kneader is taken in and out, and the effective space, particularly the height, within the heating chamber is reduced.

There were problems like this.

An object of the present invention is to solve the above-mentioned problems and provide a high-frequency heating device with a stirring function that is easy to operate, use, and clean.

Means for Solving the Problems The high-frequency heating device of the present invention uses a high-frequency oscillator, an upper flat heater, and a lower flat heater as heating sources, and includes a heating chamber having at least a bottom surface made of a non-magnetic metal plate; A bread container used for everything from kneading bread ingredients to baking, a fixing claw provided on the outer surface of the lower part of a support stand fixed to the bottom of the bread container to hold the bread container on the bottom surface of the heating chamber, and A hook piece that is fixed and engages with the fixing claw, a permanent magnet attached to the inner surface of the lower part of the support base, and a first movement that opens the kneading blade in the bread container through the through hole in the bottom of the heating chamber. The f! i! It is surrounded by edge material and attached to the side wall of the cavity resonator. Further, two insulating materials having the same shape are arranged in pairs to sandwich and surround the magnetically sensitive element and its connecting portion.

Effects With the above configuration, (a) the bread container can be fixed in the heating chamber by engaging the fixing claw provided on the outer surface of the lower part of the support base fixed to the container with the hook fixed to the bottom surface of the heating chamber; There is no need to make holes for fixing the container on 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) Using an upper plane heater and a lower plane heater,
The heater is removed from the heating chamber so that the heater does not get in the way when attaching and detaching the bread container, and the effective space in the heating chamber, particularly the height, can be increased.

(d) 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.

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

(f) The cavity resonator, on which the magnetically sensitive element is mounted, is a metal body and is fixed to the bottom surface of the heating chamber 1, and becomes high in temperature due to thermal conduction when the heater is heated. However, since the magnetically sensitive element is surrounded by an insulating material, it provides insulation and electrical protection for the cavity resonator. You can do the edge.

(g) Since the insulating material is made up of pairs of the same shape and sandwiched between the magnetically sensitive element and its connecting portion, storage management and assembly workability are improved.

(h) Since the support base, the bottom of the heating chamber, and the cavity resonator are all made of nonmagnetic metal, the magnetic field from the permanent magnet efficiently reaches the magnetic sensing element without being affected by anything.

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 device of the present invention is used as an automatic bread maker, will be described. With reference to this diagram, the present device will be explained by dividing it into five components according to function. That is, as these components, the first one is related to high frequency heating, the second one is related to heater heating,
The third is related to the bread container, the fourth is related to the rotation drive unit, and the fifth is related to the 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. This heating chamber 1 has at least a bottom surface made of a non-magnetic metal plate, for example 5tlS30.
It is formed by 4. Reference numeral 2 denotes a high frequency oscillator, 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. 5 is a cooling fan for cooling the high frequency oscillator 2.

The components related to heater heating will be explained.

6 is an upper plane heater attached to the outside 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. 8 is a lower flat heater attached to the outside of the bottom of the heating chamber 1. 9
is a heat insulating material that prevents heat from escaping below the lower flat heater 8. Reference numeral 10 denotes a holding fitting for holding the lower flat heater 8 and the heat insulating material 9 on the outside of the bottom surface of the heating chamber. However, the mounting member of the presser metal fitting IO itself is omitted.

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. Reference numeral 12 denotes a support base consisting of a non-magnetic full-shoulder body fixed to the lower part of the 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 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 15 and degassing it. 17 is kneading feather 16
It is a rotating shaft that removably supports and makes one rotation.

18 is an oil seal made of silicone rubber or the like.

Reference numeral 19 denotes a bearing that rotatably supports the rotating shaft 17. 2
0 is a driven piece whose upper part is fixed to the rotating 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 is fitted 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. . A belt 23 rotatably connects the large pulley 22 and the small pulley 24.

25 is a small pulley 24 for rotating the kneading blade 16.
With the kneading motor connected to the
Rotate at a high speed of about 00 rpm. Reference numeral 26 denotes a cavity resonator made of a non-magnetic metal material that takes in high frequency energy that would otherwise leak out of the heating chamber 1 along the shaft 21 and prevents it from being released. A bearing (equal) that rotatably supports the first vibration @21 is fitted into the central wall of the resonator 26.

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

Next, 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. FIG. 5, 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 rotated. 33 is a rotary table that detachably supports the turntable 32 and rotates it. 34 is a second drive shaft that detachably supports the rotary table 33 and rotates it. 35 is a table motor connected to the second moving shaft 34 via a plurality of gears (circuits) and rotates the turntable 32 at a low speed of, for example, 5 to 10 rpm. Note that the second drive shaft 34 passes through the central axis of the first drive shaft 21, and both shafts 34.2I are configured 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, 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 40. 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 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 glass tube axis direction of the permanent magnet 36 and the NS pole arrangement direction of the permanent magnet 36 are approximately parallel to each other, and the directions of both 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 M edge material 40 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 recess for housing a connection part that is shallower than 0a. 40d.

40e is an outlet for the leader line 43. 40f is a protrusion formed of the same mold and inserted into the other matching hole 40g when the reed switch 38 is housed together.

That is, two insulating materials 40 are stored in pairs to surround the reed switch 38 and the connection part, and the mounting brackets 49 are
Insert it into the recess. Alternatively, the insulating materials 40 may be integrally molded in such a manner that a pair of insulating materials 40 are placed back to back on the side opposite to the outlet ports 40d and 40e and can be opened and closed. In this case, the projection 40f1 and the matching hole 40g are unnecessary. Insulation material 4
If the reed switch 38 is made of silicone rubber molded material and the outer surface is coated with silicone adhesive after the reed switch 38 is housed to prevent moisture from coming into contact with the ferromagnetic lead and the conductor part of the lead wire 43, durability will be improved.

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

Due to the following (a), (b), and (c), the high-frequency heating device of the present invention has good operability, ease of use, and easy cleaning.

(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. Therefore, it is not necessary to make a hole for fixing the bread container in the bottom surface 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 and a lower plane heater 8 are provided, and the heaters are removed from the heating chamber 1, thereby increasing the effective space, especially the height, within the heating chamber 1. ing. Furthermore, the following (d), (e),
By (f) and (g), the cost of the magnetic sensing element 38 and its mounting member can be reduced without affecting the performance of detecting the attachment and detachment of the bread container 11.

(d) In order to make it easier to adopt the magnetic sensing element 38, which 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 of the heating chamber 1, and the magnetically sensitive element 38 can be brought to a position where the temperature is lower when the heater is heated, extending from the bottom of the heating chamber 1. .

(e) 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.

(f) Cavity resonator 26 which is the mounting surface of the magnetically sensitive element 38
is a metal body and is fixed to the bottom surface of the heating chamber 1, and the temperature becomes high due to heat conduction when the heater is heated. Therefore, the magnetic sensing element 38 needs to be thermally insulated and electrically insulated from the cavity resonator 26. Therefore, the magnetically sensitive element 38 is surrounded by an insulating material.

(g) f (!! In order to improve the storage management and assembly workability of the edge material 40, two insulating materials 40 of the same shape are used as a pair so that the magnetic sensing element 38 and its connecting portion can be sandwiched. .

(h) In order to allow the magnetic field from the permanent magnet 36 to reach the magnetically sensitive element 38 efficiently, the support base 12, the bottom surface of the heating chamber 1, and the cavity resonator 26 are all made of non-magnetic metal scrap.

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 juices will easily flow down, which is undesirable.

On the other hand, the bottom of the heating chamber 1 is provided with a through hole 1a through which the dog clutch portion passes, and the vicinity of the hole Ia is made convex 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 bread to baking, as well as from mochi to rice cooking. Applicable to high-frequency heating equipment that is automatically selected from a control panel.

Effects of the Invention According to the present invention, it is possible to provide a high-frequency heating device that has multiple functions such as an automatic bread maker, oven range, and single-function microwave oven that is easy to operate, use, and clean.

Furthermore, the cost of the magnetically sensitive element and its mounting member can be reduced without affecting the performance of detecting attachment and detachment of the bread container.

[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. So, Figure 3 shows the #! that surrounds the magnetically sensitive element. Fig. 4 is an enlarged perspective view showing the shape of forest lumber, Fig. 4 is a cross-sectional view of the main parts when the high-frequency heating device of the present invention is used as an automatic bread maker, and Fig. 5 is an oven oven or single-function microwave oven. FIG. 3 is a cross-sectional view of main parts when used as 1...Heating chamber, la...Through hole, 2...
・High frequency oscillator, 6... Upper plane heater, 8...
・Lower plane heater, 11... Bread container, 12... Support stand, 13.
...Fixing claw, 14...Hook piece, 15...
・Bread ingredients, 16...Kneading blade, 21...First drive shaft, 26...Cavity resonator, 26a...Side wall, 36...Permanent magnet, 38...Magnetic sensing element (lead) switch), 40...insulating material.

Claims (3)

[Claims] (1) A heating chamber (1) whose heating sources are a high-frequency oscillator (2), an upper plane heater, and lower plane heaters (6) and (8).
), a bread container (11) in which the bread ingredients (15) are kneaded and baked in the heating chamber (1), and a bread container (11) for holding the bread container (11) on the bottom of the heating chamber (1). 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 container (11) and a fixing claw (13) fixed to the bottom surface of the heating chamber (1) and engaged with the fixing claw (13). A hook piece (14), a permanent magnet (3b) attached to the lower inner surface of the support base (12), and a kneading blade (
16) through the through hole (1a) in the bottom of the heating chamber (1), and a cavity resonator (26) for radio wave sealing provided around this drive shaft (21). A magnetically sensitive element (38) that is operated by the magnetic field from the permanent magnet (3b) to detect attachment and detachment of the bread container (11) is surrounded by an insulating material (40), and the cavity resonator (26) is A high frequency heating device characterized in that it is attached to a side wall (26a). (2) The high-frequency heating device according to claim 1, wherein the insulating material (40) is a pair of identically shaped materials sandwiching and surrounding the magnetically sensitive element (38) and its connecting portion. (3) The high-frequency heating device according to claim 1, wherein at least the bottom surface of the heating chamber (1), the support base (12), and the cavity resonator (26) are formed from a non-magnetic metal material.