JPH054237Y2 - - Google Patents

Description

[Detailed explanation of the invention] Purpose of the invention (industrial application field) This invention is related to microwave ovens, and in particular, a propeller fan is installed between the inner box that forms the cooking chamber and the outer box that covers the inner box. At the same time, an air inlet is provided on the rear wall of the propeller fan, and a heating element such as a magnetron or transformer is placed in front of the propeller fan, so that as the propeller fan rotates, air from the air inlet is directed forward. sprayed on,
The present invention relates to a microwave oven in which the heating element is cooled.

(Problems to be solved by conventional technology and invention) In this type of conventional microwave oven, when the propeller fan rotates, the air blown forward from the propeller fan cools and heats the heating element. After that, the air is moved upward along the wall located in front of the heating element and moved backward along the top plate of the outer box, creating a circulating air flow that reaches the rear of the propeller fan. There was a problem in that fresh air from outside was not effectively introduced from the air inlet at the rear of the propeller fan, and the cooling effect of the heating element was significantly deteriorated.

Structure of the device (Means for solving the problem) This device was created by focusing on the problems mentioned above. A propeller fan is provided between the propeller fan, an air inlet is provided on the rear wall of the propeller fan, and heat generating elements such as magnetrons and transformers are placed vertically in front of the propeller fan, allowing the propeller fan to rotate. Accordingly, in a microwave oven in which air from the air inlet is blown forward to cool a heating element such as the magnetron and a transformer, there is a space between the upper part of the magnetron and the lower surface of the top plate of the outer box. An obstacle plate is provided to obstruct the circulating air flow generated by the rotation of the propeller fan, and at least a portion of the upper end of the obstacle plate disposed close to the top plate of the outer box is oblique. is formed.

(Function) Therefore, in the microwave oven of this invention, the circulating air flow generated by the rotation of the propeller fan 17 is obstructed by the obstruction plate 22 above the heating elements such as the magnetron 13 and the transformer 15, and To effectively cool the heating elements 13 and 15 by diffusing the air to the left and right on the heating element without being guided backwards, and effectively introducing new air from the outside from the air inlet 18 at the rear of the propeller fan 17. I can do it. Further, as described above, the obstacle plate 22 of this invention has a part of the upper end that is sloped, so that it has spring properties and prevents deformation of the top plate portion 3a.

(Example) This example will be described in detail below with reference to the drawings.

Now, in the microwave oven of this embodiment, a heating cooking chamber 2 with an open front is formed inside the inner box 1, and as shown in FIG. It protrudes outward from the circumferential side wall of No. 2. An outer box 3 is attached to the outside of the inner box 2 and covers the inner box 2 from the outside, and is composed of a top plate part 3a and a pair of side plate parts 3b. Also, inner box 1
A bottom plate 4 is attached to the lower part of the bottom plate 4, and a plurality of support legs 5 are protruded from the bottom surface of the bottom plate 4. A door 6 is attached to the entire surface of the inner box 1, and covers the entire open portion of the heating cooking chamber 2 so as to be openable and closable. A heating cooking chamber 2 is located between the front and rear walls 1a and 1b of the inner box 1.
A housing space 7 is formed between the right end wall of the cooking chamber 2 and the right side plate 3b of the outer box 3, and a gap 8 is formed between the upper wall of the cooking chamber 2 and the top plate 3b of the outer box 3. ing.

A synthetic resin coupling 9 is rotatably supported at the inner bottom of the heating cooking chamber 2, and a reduction gear mechanism 1 is driven by a motor 10 mounted on the lower surface of the inner box 2.
1 and is designed to be rotationally driven. A glass turntable 12 for placing an object to be heated is removably supported on the coupling ring 10, and is adapted to be rotated integrally with the coupling ring 10.

A magnetron 13 is mounted on a support plate 14 on the right outer surface of the inner box 1 so as to be located in the upper part of the housing space 7.
The turntable 12 is supported through the turntable 12 and supplies high frequency energy into the heating cooking chamber 2 to heat and cook the object on the turntable 12 . Accommodation space 7
A transformer 15 is mounted and fixed on the bottom plate 4 so as to be located below the magnetron 13 in the interior.
A high voltage is supplied to the magnetron 13.

A motor 16 is attached to the front surface of the rear wall portion 1b of the inner box 1 so as to be located behind the heat generating elements such as the magnetron 13 and the transformer 15 in the housing space 7, and a propeller fan 17 is attached to the motor shaft. It is being A large number of air introduction ports 18 are formed in the rear wall portion 1b of the inner box 1 behind the propeller fan 17, and external air is introduced into the housing space 7 through the air introduction ports 18 as the propeller fan 17 rotates. It is becoming more and more common. Then, the magnetron 13 and transformer 15 are
A part of the cooled air is guided to the front of the housing space 7 and discharged to the outside from an exhaust port 19 provided in the bottom plate 4. An air guide 20 is attached to the right outer surface of the inner box 1 so as to be located close to the front of the magnetron 13, and a part of the air heated by cooling the magnetron 13 flows through the air guide 20 and the right side of the inner box 1. Air is introduced into the heating cooking chamber 2 through an air intake port 21 consisting of a large number of small holes formed in the wall to prevent the glass of the see-through window provided in the door 6 from fogging up.

An obstacle plate 22 is provided upright on the upper surface of the support plate 14 so as to be located above the heat generating elements such as the magnetron 13 and the transformer 15, and its upper and right edges are connected to the top plate of the outer box 3. 3a and right side plate part 3
b, and the upper part of the support plate 14 is shielded over almost the entire area. And the first and second
As shown by the arrow in the figure, the propeller fan 17
Circulating airflow generated within the accommodation space 7 as the propeller fan 17 rotates is obstructed by the obstruction plate 22 and diffused to the left and right, so that it is not guided to the rear of the propeller fan 17.

Further, a protrusion 22a is provided at the left end of the obstacle plate 22.
is provided, and this protrusion 22 is provided as shown in FIG.
a is placed in the gap 8 between the upper parts of the inner box 1 and the outer box 3, and a part of the air diffused from side to side on the front surface of the obstacle plate 22 flows along this protrusion 22a into the gap 8. At the same time, a part of the air within the gap 8 is also guided to the rear side of the propeller fan 17 through the rear surface of the protrusion 22a. Further, a slanted portion 22b that slopes backward downward is provided on a part of the upper edge side of the obstacle plate 22, and when a downward pressing force is applied to the top plate portion 3a of the outer box 3, this slanted portion 22b is bent downward due to its spring property, allowing uniform curvature of the top plate portion 3a, and the obstacle plate 22
Partial upward bulge-like bending of the portion corresponding to the upper end is prevented.

Therefore, when this microwave oven is used for cooking, the circulating air flow generated within the housing space 7 due to the rotation of the propeller fan 17 is generated above the heating elements such as the magnetron 13 and the tunnel lance 15. The obstacle plate 22 is obstructed by the obstacle plate 22 and is not guided to the rear of the propeller fan 17.
It is diffused in the left and right direction in front of the. For this purpose, the air inlet 18 at the rear of the propeller fan 17 is
Fresh air from the outside is effectively introduced from the gap 8, and a small amount of air is also introduced from the gap 8 through the rear surface of the obstacle plate 22, so that the heat generating elements such as the magnetron 13 and the transformer 15 are effectively cooled.

Note that this invention is not limited to the configuration of the above embodiment, and the configuration of each part may be modified without departing from the spirit of this invention, such as forming the obstacle plate 22 obliquely over the entire area between the upper and lower ends. It is also possible to change and embody it as desired.

Effects of the device As detailed above, this device prevents the circulating air flow generated by the rotation of the propeller fan from being guided to the rear of the propeller fan by blocking it with the obstruction plate above the heating element such as the magnetron or transformer. It is diffused horizontally over the heating element, and fresh air from outside is effectively introduced from the air inlet at the rear of the propeller fan, which not only makes it possible to effectively cool the heating element, but also cools down the top plate. It has an excellent effect of preventing physical deformation.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a main part showing an embodiment of a microwave oven embodying this invention, FIG. 2 is a front sectional view of the same main part, and FIG. 3 is a partially exploded perspective view. 1...Inner box, 2...Heating cooking chamber, 3...Outer box,
13... Magnetron, 15... Transformer, 17
...Propeller fan, 18...Air inlet, 22
...Obstacle board.

Claims (1)

[Scope of claim for utility model registration] Inner box 1 constituting heating cooking chamber 2 and inner box 1
A propeller fan 17 is provided between the propeller fan 17 and the outer box 3 that covers the propeller fan 17.
Heating elements such as a magnetron 13 and a transformer 15 are arranged vertically in front of the magnetron 13 and transformer 15, and as the propeller fan 17 rotates, air from the air inlet 18 is blown forward, causing the magnetron 13 and transformer 15 to generate heat. In a microwave oven designed to cool the body, the airflow between the upper part of the magnetron 13 and the lower surface of the top plate part 3a of the outer box 3 is caused by the rotation of the propeller fan 17. The microwave oven is characterized in that at least a part of the upper end of the obstacle plate 22 disposed close to the top plate 3a of the outer box 3 is formed in an oblique shape.