Vibration stabilizer assembly for a compressor in a transport refrigeration unit
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Solution Overview
Problem
Variable-speed compressors in transport refrigeration units (TRUs) generate excessive noise and vibrations at high speeds, leading to structural instability, premature wear, and increased maintenance costs.
Innovation Solution
A vibration stabilizer assembly is introduced, comprising a plurality of first buffers with radial stiffness of less than 1000 pounds per inch, and second buffers with specific axial-to-radial stiffness ratios, strategically positioned between the compressor's bottom plate and the TRU's frame to stabilize vibrations and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If variable-speed compressor operates at high speed, then productivity is improved, but vibration and noise increase causing structural instability
Solution Approach 1:
The patent introduces vibration isolators as intermediary elements positioned between the compressor and the TRU frame. These isolators act as mediators that decouple the vibration source (compressor) from the structure (frame), allowing the compressor to operate at high speeds while preventing vibration transmission that would cause structural instability.
Solution Approach 2:
The patent specifies precise stiffness parameters for the vibration isolators (radial stiffness of 50-500 lb/in and axial stiffness of 250-2000 lb/in). By carefully selecting and controlling these physical parameters, the system allows high-speed operation while maintaining structural stability through optimized vibration isolation characteristics.
2Productivity
If variable-speed compressor operates at high speed, then productivity is improved, but harmful factors increase including noise and vibration
Solution Approach 1:
Vibration isolators serve as intermediary components that block the transmission path of harmful vibrations and noise from the compressor to the TRU frame and surrounding environment, enabling high-speed operation without proportionally increasing harmful factors.
Solution Approach 2:
The patent converts the harmful vibrations generated by high-speed compressor operation into a beneficial isolation effect. By designing isolators with specific stiffness characteristics, the system uses the vibration energy to test and optimize the isolator performance, ultimately reducing noise and vibration transmission to acceptable levels.
3Strength
If rigid mounting is used to secure compressor, then strength is improved, but vibration transfer increases causing premature wear
Solution Approach 1:
The patent transitions from rigid mounting (infinite stiffness) to elastic mounting with specifically engineered stiffness parameters. The radial stiffness (50-500 lb/in) and axial stiffness (250-2000 lb/in) are optimized to provide sufficient mounting strength while introducing compliance that reduces vibration transfer and prevents premature wear.
Solution Approach 2:
The vibration isolators function as flexible elastic elements that replace rigid mounting structures. These flexible components maintain the mechanical connection and load-bearing capacity while introducing compliance that absorbs vibrations and protects the compressor from wear caused by rigid mounting constraints.
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
The assembly effectively minimizes the transfer of vibrations and noise from the compressor to the TRU's frame, enhancing structural stability, reducing maintenance needs, and attenuating noise pollution.
Implementation Method 1
a plurality of first buffers configured between a bottom plate associated with the compressor and a frame of the TRU, wherein each of the first buffers has a radial stiffness of less than 1000 pounds per inch
Data Source
AI summary
A vibration stabilizer assembly for a compressor in a transport refrigeration unit (TRU) is disclosed. The assembly comprises a plurality of first buffers configured between a bottom plate associated with the compressor and a frame of the TRU, where each of the first buffers has a radial stiffness of less than 1000 pounds per inch.