JPH01256725A - Microwave oven - Google Patents

Abstract

PURPOSE:To improve cleaning characteristic, operating characteristic and convenience in use by a method wherein a high frequency heating device is provided with a hooking piece engaged with a fixing claw, a permanent magnet interlaid between a supporting column and an inner surface of a lower part of a supporting table and fixed by a screw arranged at a lower surface of the supporting column and a magnetic sensitive element for use in detecting a fixing or a removal of a bread container under an operation of a magnetic field. CONSTITUTION:A fixing claw 13 arranged at a lower outer surface of a supporting table 12 fixed to a bread container 11 is engaged with a hooking piece 14 fixed to a bottom surface of a heating chamber 1 and then the bread container 11 is fixed to a bottom surface of the heating chamber 1. A fixing or a removal of the bread container 11 is detected by the magnetic sensitive element 38 corresponding to a magnetic field penetrating a bottom surface of the heating chamber 1 form the permanent magnet 36 fixed to a lower inner surface of the supporting table 12 of the bread container 11 fixed within the heating chamber 1. The permanent magnet 36 is held between the supporting column 12a extended from an upper surface of the supporting table 12 toward a downward position and a lower inner surface of the supporting table 12 and fixed by a setting screw 37. A condition of applied temperature of the magnetic sensitive element 38 is made effective and a fixing operation of the permanent magnet 36 is facilitated and cost reduction of the device is contrived.

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 stirring function for food.

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. When the claw comes into contact with the actuator of a microswitch provided on the back side of the bottom of the heating chamber, and 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 configuration, (a) A hole is provided in the bottom surface 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 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) 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, especially the height, within the heating chamber is reduced.

There were problems like this.

The purpose of the present invention is to solve the above-mentioned problems and improve cleanability.

An object of the present invention is to provide a high-frequency heating device with a heating function that is easy to operate and use.

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 is inserted between the support 12a extending downward from the upper surface of the support and the lower inner surface of the support 2, and the support 1
It is equipped with a permanent magnet fixed by a screw 37 provided on the lower surface of the bread container 2a, and a magnetically sensitive element that is operated by the magnetic field from the permanent magnet to detect attachment and detachment of the bread container.

action 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 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) A permanent magnet is inserted between the column that extends downward from the top of the support and the inner surface of the lower part of the support, and is fixed with a set screw provided on the bottom of the column, so it is necessary to install the permanent magnet. is easy.

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

First, FIG. 2, 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, one device will be divided into five components according to function and explained. 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 5US304.
It is formed of. 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 fitting 10 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 the used wavelength 172 or a dielectric molded product such as Pyrex that transmits high frequency waves. Reference numeral 12 denotes a support base made of a non-magnetic metal material 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 supports and rotates the device in a detachable manner.

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.

21 is a fighting piece whose upper part fits with the driven piece 20 through the through hole 1a of the heating chamber 1 to form one side of the dog clutch, and whose lower part is connected to the large pulley 22. It is a moving axis. 23 is a large pulley 22 and a small pulley 24
This is a belt that rotatably connects the

25 is a small pulley 24 for rotating the kneading blade 16.
For example, the kneading blades 16 are moved by a kneading motor connected to
Rotate at a high speed of about 0 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 bearing (equal bearing) that rotatably supports the first latch shaft 21 is fitted into the wall surface of the hollow portion 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. 3, 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 rotating table 33
This is the second drive shaft that detachably supports and drives the. 35 is a table motor connected to the second drive shaft 34 through a plurality of gears (equal) and rotates the turntable 32 at a low speed of, for example, 5 to 10 rpm. In addition, the second
The 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.

A permanent magnet 36 is inserted between the inner surface of the lower part of the support base 12 together with the support base 12 extending downward from the upper surface of the support base 12, and is fixed by a set screw 37 provided on the lower surface of the support base 12a. 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 with mounting screws 41 and 42. 43
is a leader line that connects the element 38 to the control circuit (equivalent).

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 is easy to clean, operate, and use.

(a) In order to fix the bread container 11 to the bottom surface of the heating chamber 1, a fixing claw 13 provided on the lower outer surface of the support stand 12 attached to the bread container 11 is engaged with a hook piece 14 fixed to the bottom surface of the heating chamber 1. Therefore, there is no need to make a hole in the bottom of the heating chamber 1 for fixing the bread container.

(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. moreover.

The following (d) and (e) make the operating temperature conditions of the magnetically sensitive element 38 that detects attachment and detachment of the bread container 11 favorable, and also facilitates the work of attaching the permanent magnet 36, thereby reducing costs.

(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. 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.

(e) In order to facilitate the installation work of the permanent magnet 36, the support 12a and the support 1 extend downward from the upper surface of the support 12.
A permanent magnet 36 is inserted between the lower inner surfaces of 2 and fixed with a set screw 37.

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 a hole is made in this contact surface, a large amount of food particles and liquid juice will easily flow down, which is not preferable.

On the other hand, there is a through hole 1a in the bottom 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, 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 the sequence such as mochi mochi and 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 having multiple functions such as an automatic bread maker, an oven range, and a single-function microwave oven that are easy to clean, operate, and use.

Furthermore, the use temperature conditions of the magnetically sensitive element that detects the bread container are made favorable, and the installation work of the permanent magnet is facilitated, thereby reducing costs.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of the main parts showing the detection means of the bread container and its mounting structure, and FIG. 2 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. Third
The figure is a sectional view of the main parts when used as a microwave oven or a single-function microwave oven. 1... Heating chamber, 2... High frequency oscillator, 6
... Upper plane heater, 8... Lower plane heater,
11...Bread container, 12...Support stand, 12
a... Prop, 13... Fixing claw, 14
...Hook piece, 15...Bread ingredients, 36.
...Permanent magnet, 37... Set screw. 38... Magnetic sensing element (reed switch).

Claims (1)

[Claims] A heating chamber (1) whose heating sources include a high frequency oscillator (2), an upper flat heater, and lower flat 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 column (12a) extending downward from the upper surface of the support stand (12)
and the lower inner surface of the support stand (12).
The bread container (11) is operated by a permanent magnet (36) fixed by a set screw (37) provided on the bottom surface of the heating chamber (1) and a magnetic field from the permanent magnet (36) that passes through the bottom surface 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.