JPH01277129A - High frequency heater - Google Patents

Abstract

PURPOSE:To obtain a high frequency heater which has many functions of good operativity, treatability and cleanability by providing the high frequency heater with a catching piece which is engaged with a fixed pawl and fixed on the bottom face, a permanent magnet which is attached to the lower inner face of a support stand and a magnetic induction element which detects the detachment of a bread vessel. CONSTITUTION:It is sufficient for fixing a bread vessel 11 on the bottom face of a heating chamber 1 to engage a fixed pawl 13 provided on the lower outer face of a support stand 12 attached to the bread vessel 11 with a catching piece 14 fixed on the bottom of the heating chamber 1 and fixing holes need not be drilled in the bottom face of the bread vessel 11. Further, since the detection of the detachment of the bread vessel 11 is performed by a lead switch 38 in response to a magnetic field which permeates the bottom face of the heating chamber 1 from a permanent magnet 36 attached to the lower inner face of the support stand 12 of the bread vessel 11 fixed in the heating chamber 1, detecting holes need not be drilled in the bottom face of the heating chamber 1 and operability, treatability and cleaning can be improved.

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 Conventional high frequency heating devices of this type include
This is proposed in Japanese Patent No. 42382. In the configuration of this proposal, the upper heater and lower heater are built into the heating chamber, and when the fixing piece protruding from the bottom of the kneader is inserted into the mounting hole provided on the bottom of the heating chamber and rotated at a predetermined angle. The fixing claw formed on the fixing piece is hooked on the back side of the bottom of the heating chamber, so that the kneader can be attached to the heating chamber.

The pawl comes into contact with the actuator of a microswitch provided on the back side of the bottom of the heating chamber, and when the microswitch is turned on, bread-specific sequences such as fermentation and kneading can be performed.

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 possibility that a large amount of food particles, liquid liquid, etc. may flow out from this hole, causing an inconvenience.

(b) Also, since the upper heater and lower heater are both located inside the heating chamber, there are problems such as getting in the way when putting in and taking out the kneading machine, and reducing the effective space in the heating chamber, especially the height. .

Means for Solving the Problems The present invention has been made to solve the above problems, and uses a high frequency oscillator, an upper flat heater, and a lower flat heater as heating sources, and at least the bottom surface is made of a non-magnetic metal plate. A heating chamber, a bread container in which the bread ingredients are kneaded and baked in the heating chamber, and a fixing provided on the outer surface of the lower part of the support stand fixed to the bottom of the bread container to hold the bread container on the bottom surface of the heating chamber. It sticks to the nail and the bottom of the heating chamber.

A hook piece that engages with the fixing claw, a permanent magnet attached to the inner surface of the lower part of the support base, and a magnetic sensor that operates 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. It is equipped with an element.

Function With the above structure, (a) The bread container can be moved into the heating chamber by engaging the fixing claw provided on the outer surface of the lower part of the support base fixed to the bread container with the hook fixed to the bottom surface of the heating chamber. It can be fixed to
There is no need to make holes in the bottom of the heating chamber for fixing the bread container.

(b) Also, 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 heating chamber.

(c) Furthermore, by using an upper plane heater and a lower plane heater, the heater is removed from the heating chamber so that it does not get in the way when installing and removing bread containers, and the effective space in the heating chamber, especially the height, is saved. I'm trying to make it bigger.

(d) Also, since 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, the permanent magnet is positioned close to the bottom of the heating chamber. It becomes possible to install it. therefore,
Accordingly, the magnetically sensitive element can be brought to a position far from the bottom of the heating chamber where the temperature is lower during heating with the heater, and the element can be used at a lower operating temperature.

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

The configuration of the embodiment is as shown in FIGS. 1 to 5.

First, the present device will be explained by dividing it into five components according to function, with reference to a schematic cross-sectional view of the device in use as an automatic bread maker (home bakery) as shown in FIG.

That is, as for these components, the first is related to high frequency heating, the second is related to heater heating, the fourth is related to the bread container, the fourth is related to the rotation drive part, 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 first high-frequency heating-related configuration will be described.

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 5O3304. 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 configuration related to heating by the second heater will be explained.

6 is an upper plane heater attached to the outside of the upper surface of the heating chamber 1. Reference numeral 7 denotes an upper heat insulating member that prevents heat from escaping to the upper part 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 lower heat insulating member that prevents heat from escaping below the lower flat heater 8. Reference numeral 10 denotes a presser metal fitting for holding the lower flat heater 8 and the lower heat insulating member 9 on the outside of the bottom surface of the heating chamber 1. However, the mounting member of the presser fitting 10 itself is omitted.

The configuration related to the third bread container 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 this bread container 11
It is a support stand fixed to the bottom of the.

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 is a bread raw material consisting of wheat flour, water, yeast 1 to bacteria, etc., and in FIG. 4, the cross-sectional shape after baking shows what is called a Yamagata loaf of bread. 16 is a kneading blade for kneading the bread raw material 15 and degassing it. Reference numeral 17 is a rotating shaft that detachably supports the kneading blade 16 and rotates it once. 18 is an oil seal made of silicone rubber or the like. Reference numeral 19 denotes a bearing that rotatably supports the rotating shaft 17. Reference numeral 20 is a driven piece whose upper part is fixed to the rotating shaft 17 and whose lower part engages to form one side of the clutch.

The configuration of the fourth rotational movement relationship will be explained.

21 constitutes the other side of a dog clutch whose upper part engages with the driven piece 20 through the through hole 1a of the heating chamber 1.

This is a first drive shaft with a large pulley 22 connected to its lower part. A belt 23 rotatably connects the large pulley 22 and the small pulley 24. Reference numeral 25 denotes a kneading motor connected to the small pulley 24 for rotating the kneading blades 16, which rotates the kneading blades 16 at a high speed of, for example, about 200 rpm+. Reference numeral 26 denotes a cavity resonator that takes in high frequency energy that is about to leak out of the heating chamber 1 along the first drive shaft 21 and prevents it from being released. The wall surface of the central hollow part of this cavity resonator 26 has an 11th
A bearing (not shown) that rotatably supports the moving shaft 21 is fitted.

The configuration of the fifth outline relationship will be explained. 27 is an outer box made of a conductor. A door 28 opens and closes the front entrance of the heating chamber 1, and is used to minimize the release of high frequency energy and heater heat 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, instead of the components related to the bread container 11 shown in FIG. 4, components related to the rotational movement of the object to be heated 31 are set in the heating chamber 1 as shown in FIG. I will explain when it is used as a microwave. 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 twice. 34 detachably supports the rotary table 33;
This is a second drive shaft. A table motor 35 is connected to the second rocking shaft 34 through a plurality of gears (not shown) and rotates the turntable 32 at a low speed of, for example, 5 to 10 rpm. Note that the second shame axis 34 is
It passes through the axial center of the M moving shaft 21, and both shafts 34 and 21 rotate independently of each other.

Next, a detection means for detecting attachment and detachment of the bread container 11.

FIG. 1 showing an enlarged cross-sectional view of a main part of the mounting structure and a cross-sectional view of the vicinity of the housing portion of the magnetically sensitive element taken along the line AB in FIG. 1 will be described. A permanent magnet 36 is attached by a fixing pin 37 between the lower part of the support column 12a extending downward from the upper surface inside the support base I2 and the lower inner surface of the outer wall of the support base 12. 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 38a and 38b is sealed in a glass tube together with an inert gas, or a Hall element whose resistance value changes depending on the magnetic field. . In this embodiment, the magnetically sensitive element 38 will be described below as a reed switch. 39 is the insulating member 4
This mounting bracket is made of a non-magnetic metal body and has a recess with a U-shaped cross section for housing the reed switch 38 wrapped in a reed switch 38.

This mounting bracket 39 is fixed to the side wall 26a within the cavity resonator 26 by mounting screws 41,42. Reference numeral 43 represents a connection lead wire for connecting the reed switch 38 to a control circuit (not shown).

In order to maximize the sensitivity of the reed switch 38, the axial direction of the glass tube of the reed switch 38 and the NS pole arrangement direction of the permanent magnet 36 are made almost parallel, and the directions of both the reed switch 38 and the permanent magnet 36 are aligned in the heating chamber. 1 so that it is approximately parallel to the bottom surface of the base.

Next, FIG. 3 showing an enlarged perspective view of the insulating member 40 will be described. 40a is a tube storage recess into which a glass tube is fitted. Reference numerals 40b and 40c are stepped portions that accommodate the connecting portions between the ferromagnetic leads 38a and 38b extending from both ends of the glass tube and the connecting lead wire 43, and are formed shallower than the recessed portion 40a. 40d and 40e are outlets for connecting lead wires 43. 40f is a protrusion that comes into contact with the side wall 26a. The reed switch 38 is sandwiched between the two insulating members 40 described above, and the two are inserted into the recess 40a of the mounting bracket 49. Or the insulating member 40.

Two pieces may be made into a pair and placed back to back on the opposite side of the protrusion 40f, and may be integrally formed so as to be able to be closed.

The material of the insulating member 40 is a silicone rubber 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 leads 38a, 38b and the conductor portion of the connection lead wire 43. This will improve durability.

Next, the operation of this embodiment having the above configuration will be explained.

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 may be 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 for fixing the bread container 11 in the bottom surface of the heating chamber 1. Also, detection of attachment and detachment of the bread container 11 is performed by a reed switch 38 that responds to a 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 drill a detection hole in the bottom of the heating chamber 1. Also, in order to facilitate attachment and detachment of the bread container 11, an upper flat heater 6 and a lower flat heater 8 are provided to eliminate the heater from the heating chamber 1. and the effective space within heating chamber 1.

In particular, the height is increased.

In this way, operability, usability, and cleaning efficiency are improved.

Furthermore, a reed switch 3 detects attachment/detachment of the bread container 11.
8 generally makes it easier to use a product with a low operating temperature.
Hook piece 1 when rotating at a predetermined angle when fixing the bread container 11
A permanent magnet 36 is placed on the inner surface of the lower part of the support base 12 where 4 does not get in the way.
is attached so that the permanent magnet 36 can be brought close to the bottom of the heating chamber 1, and the reed switch 38 can be brought to a position far from the bottom of the heating chamber 1 where the temperature is lower during heating by the heater. There is.

In this manner, reed switch 38 favors operating temperature conditions.

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 on the bottom surface of the heating chamber 1 through which the meshing clutch section passes, and the vicinity of the through 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 1, a control circuit centered on a microcomputer controls the sequence from kneading bread to baking, as well as the sequence for mochi and rice cooking. This is applied to high-frequency heating equipment that automatically selects and performs heating from a control panel.

Effects of the Invention According to the present invention, an automatic bread maker (home bakery), 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 of the reed switch for detecting the bread container can be made more favorable.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of essential parts showing a detecting means and its mounting structure for a bread container of a high-frequency heating device according to an embodiment of the present invention;
Fig. 2 is a sectional view showing the stored state of the magnetically sensitive element (reed switch) seen from the direction of arrow AB in Fig. 1, and Fig. 3 is an enlarged perspective view showing the shape of the insulating member surrounding the magnetically sensitive element. 4 is a sectional view of the main part when used as the automatic bread maker, and FIG. 5 is a sectional view of the main part when used as the microwave oven or 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, 1
3...Fixing claw, 14...Hook piece, 1
5...Bread ingredients, 36...Permanent magnet, 38
...Magnetic sensing element (reed switch).

Claims (1)

[Claims] The heating chamber (1) has a high frequency oscillator (2), an upper flat heater (6), a lower flat heater (8) as heating sources, and has at least a bottom surface made of a non-magnetic metal plate.
) in which bread ingredients (15) are kneaded and baked, and a bread container (11) that is fixed to the bottom of the bread container (11) to hold the bread container (11) on the bottom of the heating chamber (1). The fixing claw (13) provided on the outer surface of the lower part of the support base (12) is engaged with the fixing claw (13), and the heating chamber (1
), the permanent magnet (36) attached to the lower inner surface of the support base (12), and 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) that is operated by a magnetic field to detect attachment and detachment of the bread container (11).