JPH0612403Y2 - microwave - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Technical Field> The present invention mainly relates to a microwave oven having an additional function such as a baking function.

<Prior Art> A microwave oven heats food by microwave, but recently, a microwave oven is provided with a heater so that the surface of the food is burnt with this heater, and a microwave oven has a baking function. There is something.

In a microwave oven having a baking function, a container having a kneading blade can be detachably set in a heating chamber. The container has bread dough stored therein and is set at a predetermined position in the heating chamber. In the set state, the blades inside the container are interlocked with and driven by a motor provided on the microwave oven main body side, whereby the bread ingredients are kneaded and the bread dough is produced. Then, this bread dough is heated by a microwave or a heater to be fermented and baked.

By the way, when the bread is baked in the heating chamber as described above, it is necessary to strictly control the temperature of the bread dough, and the accuracy of the temperature management greatly affects the quality of baked bread.

However, in the conventional microwave oven, the ambient temperature in the heating chamber is detected, and since the temperature of the object to be heated is indirectly detected, strict temperature control is difficult,
When baking bread, it is not possible to accurately detect the temperature of the bread dough, and therefore good baking cannot be expected.

<Purpose of Invention> On the other hand, in a microwave oven having a baking function, in order to prevent a user's erroneous operation, it is necessary to detect whether or not the container containing the bread material is set at a predetermined position in the heating chamber. For this reason, it is usual that the bottom of the heating chamber is provided with a detector for detecting the presence or absence of a container. And
A part of the detection part always contacts the container.

According to the present invention, as described above, in a microwave oven that uses a container for baking bread or the like, a detection unit for detecting the presence or absence of the container is provided in the heating chamber, and a part of the detection unit always contacts the container. Focusing on this point, it is an object of the present invention to make it possible to accurately detect the temperature of an object to be heated such as bread dough inside the container to enable strict temperature control.

<Construction of the Invention> In order to achieve the above object, the present invention provides a contactor for detecting the presence or absence of a container at the bottom of the heating chamber, and attaches a temperature detecting element to the contactor, while A peripheral wall portion is provided on the bottom portion so as to surround a portion that comes into contact with the temperature detecting element.

<Embodiment> Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

1 to 6 relate to an embodiment of the present invention. FIG. 1 is a vertical sectional view showing a schematic structure of an entire microwave oven, FIG. 2 is an enlarged sectional view of essential parts, and FIG. 3 is an electric circuit. Fig. 4 (A) is a schematic side view showing the relationship between the container and the heating chamber, Fig. 4 (B) is a schematic front view of the same, Fig. 5 is an enlarged view of a main part, and Fig. 6 is a lower part of the protrusion. It is the perspective view seen from.

In FIG. 1, 1 is a magnetron, 2 is an antenna of the magnetron 1, 3 is a waveguide, and 4 is a heating chamber.

Inside the heating chamber 4, a container 5 for baking bread is detachably set. That is, the bottom of the heating chamber 4 is provided with a guide 25 for guiding the leg portion 5a of the container 5 in the front-rear direction, and the container 5 is attached and detached by being inserted from the front of the heating chamber 4. Has become.

The container 5 has a kneading blade 6 rotatably mounted on the inner bottom portion thereof, and a passive gear 26 as a passive portion which is engageable / disengageable is provided on the outer surface of the bottom portion. The container 5 is made of a metal material having good thermal conductivity such as aluminum, but may have a surface coated with a microwave absorbing material so as to absorb microwaves and generate heat.

On the other hand, the main body side of the microwave oven is provided with a motor 8 for rotationally driving the kneading blade 6 of the container 5, and a transmission shaft 9 for transmitting the rotational force of the motor 8 to the kneading blade 6. There is. The drive shaft 8a of the motor 8 and the transmission shaft 9 are interlockingly connected via pulleys 10 and 11 and a belt 12. The transmission shaft 9 projects from the bottom plate 4a of the heating chamber 4 to the inside of the heating chamber 4, and the projecting end portion thereof serves as a transmission portion to serve as the container 5
A transmission gear 27 that meshes with the passive gear 26 is provided. The passive gear 26 and the transmission gear 27 are arranged so as to be in mesh with each other and displaced in the direction perpendicular to the paper surface of FIG.

As shown in an enlarged view in FIG. 2, a contactor 13 for detecting the presence or absence of the container 5 is provided at the bottom of the heating chamber 4 so as to penetrate the bottom plate 4a. This contactor 13 is a leaf spring 1
It is supported on the lower surface side of the bottom plate 4a via 4 so as to be vertically movable. Reference numeral 15 is a flange of the contactor 13. The free end of the leaf spring 14 faces the switch piece 17a of the detection switch 17 fixed to the lower surface side of the bottom plate 4a by the mounting plate 16.

Further, the contactor 13 is composed of a cylindrical body whose upper end is closed, and a temperature detecting element 18 such as a thermistor is inserted inside the cylindrical body. 18a is a temperature detecting element 1
The lead wires 8 and 19 are fixing resins for the temperature detecting element 18.

On the other hand, on the bottom surface of the container 5, a protrusion 28 for pushing down the contact 13 is provided in a protruding manner. This protrusion 28 is shown in FIGS.
As clearly shown in the drawing, the insertion front surface has a tapered surface 29, and a portion that comes into contact with the contactor 18, that is, the tapered surface 2
At the lower end of 9 is a skirt (peripheral wall) that is open to the front side of insertion
0 is provided.

FIG. 3 is a circuit diagram of an electric circuit including the detection switch 17 and the temperature detection element 18. Both detection signals of the detection switch 17 and the temperature detection element 18 are sent to a single LSI via a container detection circuit 20 or a temperature detection circuit 21, respectively.
Is input to the determination circuit 22 and the detection content is determined by the determination circuit 22. The determination signal of the determination circuit 22 is input to the control circuit 23, and the control circuit 23 controls the operation of the magnetron 1 and the motor 8 via the drive circuit 24 according to the cooking mode selected by the operation switch (not shown). To do.

Next, the operation of the above configuration will be described. First, ingredients such as flour, butter, sugar, salt, yeast, and water are put into the bread baking container 5. Then, guide the leg 5a of the container 5 to the guide 2
The container 5 is slid and inserted into the heating chamber 4 in a state in which the container 5 is fitted. Then, the contactor 13 first comes into contact with the taper surface 29 of the projection 28, and thus is pressed down by the taper surface 29 without difficulty and fits inside the skirt 30. Is positioned. When the contact 13 is pushed down, the detection switch 17 is switched via the leaf spring 14, and the presence of the container 5 is detected. At this time, the passive gear 26 of the container 5 meshes with the transmission gear 27 on the main body side, and the kneading blade 6 in the container 5 can be driven to rotate.

When the setting of the container 5 is completed in this way, the control circuit 23
The motor 8 is started in response to the command of, and the kneading blades 6 of the container 5 are rotated by the driving of the motor 8 to knead the above-mentioned ingredients to make bread dough.

After the dough is kneaded, it is heated by the microwave of the magnetron 1 or the heat generated by a heater (not shown) provided in the heating chamber 4, fermented and baked.

In this case, the heating control by the magnetron 1 or the heater needs to be strictly performed according to the temperature of the bread dough that is the object to be heated, but the temperature detection element 18 is the contactor that is in contact with the bottom of the container 5. It is built in 13, and the tip of the contact 13 is surrounded by the skirt 30. Therefore, the temperature detecting element 18 can accurately detect the actual temperature of the bread dough through the outer wall of the container 5 without being affected by the heat inside the heating chamber 4, and the strict temperature control according to the temperature of the bread dough is performed.

In the embodiment, the bread baking container 5 is slidably inserted from the front of the heating chamber 4, but the method of setting the container 5 and the method of pushing down the contact 13 are not limited to this. Needless to say, it is also possible to place the above-mentioned on the bottom of the heating chamber 4 from above and push down the contact 13 by this placement.

Further, in the embodiment, the temperature detecting element 18 is inserted inside the contactor 13, but the temperature detecting element 1 is not always connected to the contactor 13.
It is not necessary to cover the entire 8 and the temperature detecting element 18 may be partially exposed to the outside of the contactor 13.

Furthermore, in the embodiment, the container 5 for baking is shown as the container to be set in the heating chamber 4, but the container 5 for baking bread has a kneading blade 6. Good.

<Effects of the Invention> As described above, according to the present invention, the temperature detecting element is attached to the contactor that contacts the container, and the peripheral wall portion is provided on the bottom of the container so as to surround the portion contacting the temperature detecting element. Since it is provided, it is possible to directly detect the temperature of the object to be heated in the container through the outer wall of the container without being affected by the heat in the heating chamber, and it is possible to be affected by the ambient temperature in the heating chamber as in the conventional case. In addition, accurate temperature detection is possible, and heating cooking that requires strict temperature control such as baking can be performed without problems.

Moreover, the structure of the container is simple because the detection part of the container also serves as the temperature detection part while detecting the presence / absence of the container and the temperature of the object to be heated.

Further, when the temperature detecting element is built in the contactor as in the embodiment, the temperature detecting element is protected by the outer wall of the contactor, and the temperature detecting element is prevented from being damaged.

[Brief description of drawings]

1 to 6 relate to an embodiment of the present invention. FIG. 1 is a vertical sectional view showing a schematic structure of the entire microwave oven, FIG. 2 is an enlarged sectional view of essential parts, and FIG. 3 is an electric circuit diagram. FIG. 4 (A) is a schematic side view showing the relationship between the container and the heating chamber, FIG. 4 (B) is a schematic front view thereof, FIG. 5 is an enlarged view of a main part, and FIG. FIG. 4 ... Heating chamber, 5 ... Container, 13 ... Contactor, 17 ...
Detection switch, 18 ... Temperature detection element, 30 ... Skirt (peripheral wall).

Claims (1)

[Scope of utility model registration request] 1. A contact for detecting the presence or absence of a container is provided at the bottom of a heating chamber, and a temperature detecting element is attached to this contact, while the bottom of the container encloses a portion in contact with the temperature detecting element. A microwave oven characterized by having a peripheral wall section.