JPH0315923Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> The present invention relates to a microwave oven capable of convection cooking, etc.

<Prior art> Conventionally, a damper mechanism for a convection using a heat-sensitive elastic material such as a shape memory alloy spring of a microwave oven with a convection supplies current to a heat-sensitive elastic material 1 as shown in FIG. The material 1 heats itself due to its own heat generation, thereby changing the shape of the heat-sensitive elastic material 1 and opening and closing the damper 2.

In this case, if the voltage of the power source 3 (for example, 100V) is supplied as it is, excessive self-heating will occur, so the shape of the heat-sensitive elastic material 1 is changed by supplying current with a voltage of several volts divided from the convection electric motor 4. damper 2 is opened and closed. If we look at this from a cost perspective, the electric motor 4 for convection requires the addition of one terminal to divide the voltage, making it a special motor, and the heat-sensitive elastic material is insulated to supply current. Since terminal 5 is required, the cost is high. Note that 6 is a magnetron cooling fan.

<Purpose> Therefore, the present invention aims to provide a microwave oven with a simple structure and low cost, in which a damper can be opened and closed without supplying current to the heat-sensitive elastic material.

<Example> Hereinafter, an example of the present invention will be explained with reference to FIGS. 1, 2, and 3. This microwave oven has a heater 7 for convection heating and a damper 2, and a heater 7 for opening and closing the damper 2. Equipped with a heat-sensitive elastic material 1,
The heat-sensitive elastic material 1 is placed behind the heater 7 so as to efficiently receive the radiant heat from the heater 7, and in order to improve the thermal responsiveness of the heat-sensitive elastic material 1, the radiant heat of the heater 7 is directed toward the heat-sensitive elastic material 1. An auxiliary reflecting plate R that reflects light to the heater 7 is provided opposite to the heater 7. The heater 7 is provided behind the rear wall 9a of the oven 9 having the punched metal portion 9p, and a reflective wall 10 for convection heating is formed behind the heater 7.
A convection electric motor 4 connected to a power source 3 is provided on the rear side of the reflecting wall 10.
A rotating shaft 4a of the electric motor 4 is formed to pass through the reflecting wall 10, and a convection fan 8 is provided on the rotating shaft 4a.

In addition, in this embodiment, a shape memory alloy spring is used for the heat-sensitive elastic material 1.

Further, a tightly wound heat-sensitive elastic material 1 which has been subjected to shape memory treatment is arranged behind the reflective wall 10, and one end thereof is connected to a locking protrusion 10a formed on the rear side of the reflective wall 10. , and the other end thereof is respectively locked to the door 2a of the convection damper 2 provided on the side wall 9b of the oven 9 via a pulley 11 provided on the rear side of the reflecting wall 10.
The vent 2b of the damper 2 is made of punching metal, and air enters and exits from the vent 2b through the door 2.
It is adjusted by opening and closing a. The damper 2 has
A tension coil spring (bias spring) 12 for opening and closing the door 2a of the damper 2 is locked, and one end of the tension coil spring 12 is locked to the door 2a of the damper 2, and the other end is locked to the main body A. ing.

Further, a cooling fan 6 for the magnetron 13 is provided outside the side wall 9b of the oven 9.

In this embodiment, when the convection operation is started, the cooling fan 6 is turned on as shown in FIG.
Since the door 2a of the damper 2 is open, a portion of the air emitted from the damper 2 is flowed into the oven 9, while the heater 7 is energized to generate heat. The hot air from the heater 7 is stirred by the rotation of a convection fan 8 connected to the convection electric motor 4 and flows into the oven 9. Then, the heat-sensitive elastic material 1 is heated by the radiant heat of the heater 7, and this temperature rise causes the heat-sensitive elastic material 1 to contract. In this case, the radiant heat of the heater 7 is reflected by the auxiliary reflecting plate R toward the heat-sensitive elastic material 1, thereby promoting heating of the heat-sensitive elastic material 1. Then, the door 2a of the damper 2, which is in the open state due to the tension of the tension coil spring 12, is moved in the closing direction via the pulley 11 due to the restoring force of the heat-sensitive elastic material 1. At this time, the tension coil spring 12 is in an extended state. Next, as shown in FIG. 2, the damper 2 is closed, so that only the hot air from the heater 7 circulates inside the oven, and convection cooking is carried out satisfactorily.

Then, when switching to microwave operation, the heater 7 is de-energized and the heat-sensitive elastic material 1 is cooled and stretched to its original length, so the damper 2 is opened by the restoring force of the stretched tension coil spring 12. Then, the air that has cooled the magnetron 13 is sufficiently flowed into the oven 9, and microwave cooking is performed satisfactorily.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and it goes without saying that many modifications and changes can be made to the above-mentioned embodiments within the scope of the present invention. It is also possible to use a bimetal instead of a shape memory alloy spring.

<Effects> As is clear from the above description, the present invention includes a heat-sensitive elastic material that has a heating heater and a damper and opens and closes the damper, and the heat-sensitive elastic material has the following features:
A reflecting plate is disposed behind the heater to efficiently receive the radiant heat from the heater, and is opposed to the heater and reflects the radiant heat of the heater toward the heat-sensitive elastic material in order to improve the thermal responsiveness of the heat-sensitive elastic material. It was established by

Therefore, according to the present invention, the opening/closing of the damper using the heat-sensitive elastic material uses the radiant heat of the heater from the reflector plate, which simplifies the structure, makes it inexpensive to manufacture, and reduces electricity consumption. .

In addition, the heat-sensitive elastic material is placed behind the heater to efficiently receive radiant heat from the heater.
In order to improve the thermal responsiveness of the thermosensitive elastic material, a reflector plate that reflects the radiant heat from the heater toward the thermosensitive elastic material is provided opposite the heater, so that the damper can be opened and closed accurately by the thermosensitive elastic material. can.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view of the embodiment of the microwave oven of the present invention in a damper open state, Fig. 2 is a cross-sectional plan view of the damper closed state, Fig. 3 is an overall perspective view, and Fig. 4 is a transverse plan view of a conventional microwave oven. It is a diagram. 1: Heat-sensitive elastic material, 2: Damper, 7: Heater, R: Reflector.

Claims (1)

[Scope of utility model registration request] It has a heater for heating and a damper, and a heat-sensitive elastic material for opening and closing the damper, and the heat-sensitive elastic material is arranged behind the heater to efficiently receive radiant heat from the heater. In order to improve the heat-sensitive response of the microwave oven, a reflecting plate is provided opposite to the heater to reflect the radiant heat of the heater toward the heat-sensitive elastic material.