Oven Fan Motor Leaf-Spring Mounting for Noise Reduction
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Solution Overview
Problem
Domestic ovens generate noise due to high amplitude vibrations from fan motors, and existing solutions like rubber vibration attenuators are ineffective at high temperatures and occupy significant space.
Innovation Solution
The oven design features a fan motor mounted outside the rear wall with metal leaf springs, specifically spring steel, that extend between motor lugs and a mounting plate to attenuate vibrations, reducing noise and allowing for easy assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If rubber vibration attenuators are used to reduce fan motor noise, then noise is reduced, but the attenuators occupy much space and can be harmed by melting due to high temperatures
Solution Approach 1:
The patent changes the material parameter from rubber to metal leaf spring, which has different thermal and mechanical properties. The metal leaf spring can withstand high temperatures without melting and provides vibration attenuation through elastic deformation, resolving the contradiction between noise reduction and space/temperature constraints.
Solution Approach 2:
The metal leaf spring is a simple, inexpensive component that replaces complex rubber attenuators. It provides effective vibration damping through its elastic properties without requiring large space or special temperature-resistant materials, making it a practical short-term solution.
2Object-generated harmful factors
If rubber vibration attenuators are used to reduce fan motor noise, then noise is reduced, but the attenuators can be harmed by melting due to high temperatures and lose their dampening properties
Solution Approach 1:
The patent changes the material parameter from rubber to metal leaf spring, which has different thermal and mechanical properties. The metal leaf spring can withstand high temperatures without melting and provides vibration attenuation through elastic deformation, resolving the contradiction between noise reduction and space/temperature constraints.
3Volume of stationary object
If the fan motor is mounted inside the heating chamber, then space is saved, but the motor is affected by high temperatures
Solution Approach 1:
The patent extracts the fan motor from the high-temperature heating chamber environment and mounts it on the rear wall. This separation allows the motor to operate in a cooler environment while the leaf spring vibration attenuators are positioned to reduce noise transmission to the chamber, resolving the contradiction between space utilization and temperature exposure.
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 effectively reduces fan motor noise by minimizing vibration transmission to the oven's rear wall, maintaining performance at high temperatures without the space constraints of traditional rubber dampers.
Implementation Method 1
The leaf spring stretches in the direction the lug extends and attenuates the vibrations of the fan motor in the parallel direction to the mounting plate
Implementation Method 2
The leaf spring is produced of metal, preferably of spring steel
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to an oven (1 ) that comprises a heating chamber (2) wherein the cooking process is performed, a heater disposed in and at the back side of the heating chamber (2), a rear wall (4) covering the rear side of the heating chamber (2), a fan motor (5) mounted outside the rear wall (4) for rotating the fan (3) in the heating chamber (2), a mounting plate (7) secured outside the rear wall (4) for mounting the fan motor (5) outside the rear wall (4) and wherein the fan motor (5) vibrations transmitted to the heating chamber (2) is reduced by means of the leaf springs (8) disposed between the motor lugs (6) and the mounting plate (7).