Heat Pump Rotary Compressor Vibration Damping for Quiet Drying
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Solution Overview
Problem
Household appliances with rotary compressors experience noise and fatigue issues due to torsional vibrations, which can lead to refrigerant loss and compressor failure.
Innovation Solution
An oscillatable mass is attached to the compressor's foot elements, with its natural frequency matched to the torsional vibrations, to absorb and resonate against the stator's vibrations, reducing compressor amplitude and refrigerant line vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a rotary compressor is used in a heat pump, then energy efficiency is improved, but torsional vibrations increase causing noise and fatigue problems
Solution Approach 1:
The patent converts the harmful torsional vibrations into a beneficial effect by using a vibration absorber tuned to the same frequency. The absorber mass resonates with the compressor vibrations, converting mechanical vibration energy into controlled oscillations that cancel out the harmful effects, thereby reducing noise and fatigue while maintaining the energy-efficient rotary compressor operation
2Object-generated harmful factors
If vibration absorbers are added to reduce noise, then noise level is reduced, but device complexity increases
Solution Approach 1:
The patent applies local quality by positioning the vibration absorber specifically at the base plate where torsional vibrations are most pronounced. The absorber is strategically located to target the fundamental frequency of the compressor, providing localized vibration control without requiring complex systems throughout the entire device. This focused approach reduces noise effectively while minimizing added complexity
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 solution effectively reduces noise and enhances the fatigue strength of pipelines and connections by aligning the oscillatable mass's natural frequency with the compressor's torsional vibrations, minimizing the risk of refrigerant loss and compressor failure.
Implementation Method 1
at least one oscillatable mass is assigned to the compressor as a vibration damper, the natural frequency of which is matched to the torsional vibrations generated by the compressor
Implementation Method 2
an oscillatable mass is arranged jointly on several foot elements... it is easy to manufacture and assemble
Data Source
Figure 1~2
Figure 3~3a
Figure 4~4c
AI summary
The invention relates to a household appliance with a drying unit, such as a clothes dryer (10), a washer-dryer, or a dishwasher, wherein the drying is carried out by or with the assistance of a heat pump arrangement (1) which includes a rotary compressor, in particular a rotary piston compressor. To reduce noise generation, it is proposed that the compressor (3) be assigned at least one vibrating mass as a vibration damper, the natural frequency of which is tuned to the torsional vibrations generated by the compressor (3).