JPH039275Y2 - - Google Patents

Description

[Detailed explanation of the idea] (b) Industrial application fields The present invention relates to a microwave oven.

(b) Prior art As prior art, Japanese Utility Model Application Publication No. 170784/1984 discloses that the intake sides of a Shirotsko fan and a propeller fan are placed close to each other near the same intake port in the electrical equipment room, and the magnetron is connected to the Shirotsko fan and the propeller is A microwave oven is described that uses a fan to cool other electrical parts such as a transformer. This uses the high pressure and small air volume characteristics of the Sirotskov fan, and the low pressure and large air volume characteristics of the propeller fan, but since the propeller fan has a suction effect at the center even on its output side, it is different from the prior art described above. In the configuration,
Air entering from the intake port tends to flow toward the Sirotskov fan, and the propeller fan cannot demonstrate its original characteristics.

(c) Problems to be Solved by the Invention The present invention provides a microwave oven structure in which a Sirotskov fan and a propeller fan are used in common, in which both fans can take full advantage of their respective characteristics.

(d) Means for solving the problem The microwave oven of the present invention has a first air outlet that goes out to the exhaust port of the electrical equipment room after cooling the transformer etc. arranged in the electrical equipment room.
A cooling path, a second cooling path that cools the magnetron arranged in the electrical equipment room and then exits to the outside via the heating chamber, a propeller fan that takes air from the intake port of the electrical equipment room and blows it to the first cooling path, and A Shirotsuko fan that takes in a part of the output air and sends it to the second cooling path, and a partition wall that prevents short paths between the intake passages of the propeller fan and the Shirotsuko fan.

(E) Effect Almost all of the air that enters from the intake port enters the propeller fan, so the propeller fan's air volume is sufficiently secured, and the load pressure on the propeller fan is greatly reduced by the suction action of the Sirotskov fan. The air volume increases compared to when used alone, and the air volume of the Shirotsuko fan also increases because some wind pressure is applied to the suction side.

(f) Example The figure shows the inside of the electrical compartment 1 of the microwave oven of this example. Propeller fan 3 driven by motor 2
The air is taken in through the intake port 4 of the electrical equipment room, and a portion of the output air cools electrical components such as the transformer 5 and the capacitor 6, and then proceeds through the first cooling path leading to the exhaust port 7 of the electrical equipment room.

On the other hand, the output air from the Sirotskov fan 8, which is also driven by the motor 2, cools the magnetron 9, is guided through the duct 10, enters the heating chamber through the punched hole 11 on the side wall of the heating chamber, and then exits from the exhaust duct 12. Proceed through the second cooling path that exits.

The intake port of the Sirotskov fan 8 itself is located at the upper part on the opposite side from the propeller fan 3, and its intake path and the intake path of the propeller fan 3 are separated by a partition wall 13.
Short circuit is prevented. Therefore, the air entering from the intake port 4 of the electrical equipment room is not directly taken into the Sirotskov fan 8, and a part of the output air from the propeller fan 3 bypasses the periphery of the duct 10 and enters the Sirotskov fan 8.

Therefore, the air entering from the intake port 4 is not fought between the Shirotsuko fan 8 and the propeller fan 3, and a sufficient air volume of the propeller fan 3 is ensured, and the intake action of the Shirotsuko fan 8 is controlled by the propeller fan 3.
The load pressure of the propeller fan 3 is lowered to further increase the air volume of the propeller fan 3. Furthermore, since a part of the wind pressure of the propeller fan 3 is applied to the intake side of the Shirotsuko fan 8, the air volume of the Shirotsuko fan increases somewhat. When the radio wave stirring blades in the heating chamber are rotationally driven by the wind passing through the heating chamber, it is preferable that the air volume of the Sirotskov fan is large.

(g) Effects of the invention According to the invention, in a configuration in which a propeller fan and a Sirotskov fan are used together, the characteristics of both fans can be fully exhibited, and the cooling effect can be enhanced.

[Brief explanation of drawings]

The figure is a sectional view showing an embodiment of the present invention. 1...Electrical equipment room, 2...Motor, 3...Propeller fan, 4...Intake port, 5...Transformer, 7...
Exhaust port, 8... Sirotskov fan, 9... Magnetron, 13... Bulkhead.

Claims (1)

[Scope of utility model registration request] A first cooling path that cools the transformer etc. placed in the electrical equipment room and then exits to the exhaust port of the electrical equipment room, a second cooling path that cools the magnetron located in the electrical equipment room and then exits to the outside via the heating room, the electrical equipment room. A propeller fan that takes in air from the intake port of the propeller fan and sends it to the first cooling path, a Sirotskov fan that takes in a part of the output air of the propeller fan and sends it to the second cooling path, and a short-circuit between the propeller fan and the Sirotskov fan. A microwave oven equipped with a blocking bulkhead.