Scroll Compressor Support Fit Design for Vibration Absorption
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Solution Overview
Problem
Existing scroll compressors face challenges in effectively reducing noise and vibration due to misalignment and pressure changes during operation.
Innovation Solution
The compressor design incorporates a housing with a fixation target member that is rotatably supported and fixed to the casing via multiple welds in a circumferential direction, ensuring a specific fit relationship between the housing and casing that allows for slight movement and vibration absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the fixation target member is rigidly fixed to the casing, then structural stability is improved, but noise and vibration increase
Solution Approach 1:
The fixation target member is designed with dynamic characteristics that allow it to move slightly relative to the casing during operation. This slight movement enables the member to absorb vibrations generated by the compression mechanism, converting kinetic energy into thermal energy through friction, thereby reducing noise and vibration while maintaining structural stability through multiple welds in a circumferential direction.
2Reliability
If multiple welds are provided in a circumferential direction, then fixation reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The fixation structure is segmented into multiple discrete welds distributed in a circumferential direction around the barrel. This segmentation allows each weld to independently contribute to the overall fixation reliability, while the circumferential distribution pattern provides systematic arrangement that facilitates manufacturing processes and quality control.
3Object-generated harmful factors
If a fit relationship with specific tolerance classes is maintained, then vibration absorption is improved, but manufacturing precision requirements increase
Solution Approach 1:
The invention specifies particular fit relationship parameter combinations (H8/f7, F8/h9, H7/f7, F8/h6, H7/g6, or G7/h6) between the barrel inner diameter and fixation target member outer diameter. These parameter changes define optimal clearance or interference fit conditions that enable vibration absorption through controlled slight movement, while representing achievable manufacturing precision levels for industrial production.
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 design reduces noise and vibration by converting kinetic energy into thermal energy through friction, effectively attenuating vibrations and improving the operational quietness of the scroll compressor.
Implementation Method 1
reduces noise and vibration by converting kinetic energy into thermal energy through friction
Data Source
AI summary
A compressor includes a casing having a tubular barrel, a fixation target member housed in the casing and fixed to the barrel, and a plurality of welds provided in a circumferential direction of the barrel. The welds connect the barrel and the fixation target member to each other. The fixation target member is a support configured to rotatably support a compression mechanism configured to compress a refrigerant or a drive shaft connected to the compression mechanism. An inner diameter of the barrel and an outer diameter of the fixation target member in a rated operating state of the compressor being in a fit relationship in which a combination of a tolerance class for a hole and a tolerance class for a shaft (hole/shaft) defined in ISO 286 corresponds to H8/f7, F8/h9, H7/f7, F8/h6, H7/g6, or G7/h6.