Dual-Impeller Microwave Oven Venting for Shorter Suction Paths
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Solution Overview
Problem
Ventilation microwave ovens with double exhaust fans face high resistance and reduced air/exhaust fumes suction due to the long path air with exhaust fumes needs to travel, and the limited cabinet depth restricts fan placement, leading to increased pressure and noise.
Innovation Solution
The design includes a housing with left and right air inlets at the bottom and an air outlet, with left and right fans having front and rear impellers spaced from the driving motor and adjacent to the chamber walls, reducing the air/exhaust fumes path and allowing efficient suction without increasing fan speed or noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the air inlet is positioned at the bottom plate and air is sucked from both front and rear ends of the fan, then the fan can be installed within the cabinet, but the air must change direction which increases the suction path length and resistance
Solution Approach 1:
The patent repositions the air inlet from the bottom plate to the front plate, changing the spatial dimension of air intake. This allows air to enter the fan directly from the front without requiring directional changes, thereby shortening the suction path length while maintaining cabinet installation compatibility
2Length of stationary object
If the air inlet is positioned close to the front and rear plates to fit within cabinet depth, then the cabinet depth limitation is satisfied, but large pressure is generated to the fan reducing air suction amount
Solution Approach 1:
The patent divides the air intake function into two separate inlets: a first air inlet on the front plate and a second air inlet on the rear plate. This segmentation allows each inlet to be optimally positioned for its specific function, with the front inlet providing direct air supply to reduce pressure on the fan, while maintaining compact cabinet depth
3Productivity
If the rotating speed of the fan is increased to ensure air suction amount, then adequate air suction is achieved, but the noise is correspondingly increased
Solution Approach 1:
The patent pre-positions the air inlet on the front plate to directly supply air to the fan before the fan operates. This preliminary air supply reduces the pressure burden on the fan during operation, allowing the fan to run at lower speeds while maintaining adequate air suction amount, thereby reducing noise generation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances air and exhaust fumes suction efficiency, reduces noise, and improves cooling of the motor, resulting in a microwave oven with high efficiency and low noise.
Implementation Method 1
a left air channel being formed between a left side wall of said receiving chamber and a left side of said inner case and being in communication with said left air inlet and said air outlet of the housing, a right air channel being formed between a right side wall of said receiving chamber and a right side of said inner case and being in communication with said right air inlet and said air outlet of the housing
Implementation Method 2
a left fan and a right fan, said left fan being provided in the left air channel and said right fan being provided in the right air channel, the left fan and the right fan each including a front impeller, a rear impeller and a driving motor
Implementation Method 3
the left fan and the right fan each including a front impeller, a rear impeller and a driving motor
Data Source
AI summary
A microwave oven includes a housing having a receiving chamber therein. An inner case is provided in the receiving chamber. A left air channel is formed between a left side wall of the receiving chamber and a left side of the inner case, a right air channel is formed between a right side wall of the receiving chamber and a right side of the inner case. Respective fans are provided in the left and right air channels, each of the left and right fans including a front impeller, a rear impeller and a driving motor. At least one of the front and rear impellers is adjacent to at least one of front and rear walls of the receiving chamber which is corresponding thereto, at least one of the front and rear impellers is spaced from the driving motor at a predetermined distance.