Scroll Compressor Buffer Member Reduces Impact Noise
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Solution Overview
Problem
Existing scroll compressors experience noise and vibration issues due to rotational clearance between the shaft and eccentric bush, leading to potential damage from liquid refrigerant compression and increased inertial and unbalance forces when using buffer members to mitigate impact sounds.
Innovation Solution
A scroll compressor design incorporating a buffer member that can perform relative motion with respect to the shaft and eccentric bush, featuring a ring-shaped structure with specific diameter and thickness configurations to prevent contact and reduce inertial forces, while being segmented or featuring curved and bent parts to minimize contact areas and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotational clearance is provided between the shaft and eccentric bush to prevent scroll damage during initial operation, then the risk of scroll damage from liquid refrigerant compression is reduced, but impact sounds and vibrations occur due to eccentric bush rotation relative to the shaft
Solution Approach 1:
A buffer member is introduced as an intermediary element between the shaft and the eccentric bush. This buffer member absorbs the impact during initial operation when the eccentric bush rotates relative to the shaft, preventing direct contact and impact sounds while still allowing the necessary rotational clearance to protect the scrolls from liquid refrigerant damage.
Solution Approach 2:
The buffer member provides beforehand cushioning by being pre-positioned between the shaft and eccentric bush. During normal operation, it maintains a cushioning effect that prevents impact sounds when the eccentric bush rotates due to rotational clearance, while still allowing the rotational movement necessary for scroll protection during startup.
2Object-generated harmful factors
If a buffer member is fixed to the shaft or eccentric bush to reduce impact sound, then impact sounds are reduced, but inertial force increases leading to increased power consumption and worsened noise and vibration
Solution Approach 1:
The buffer member is designed to be movable rather than fixed, allowing it to dynamically adjust its position based on operational conditions. During startup, it provides cushioning when the eccentric bush rotates relative to the shaft, but during normal operation, it moves with the system without adding significant inertial force, thus avoiding increased power consumption and additional noise and vibration.
Solution Approach 2:
The buffer member's physical parameters (position, contact state) change based on operational phase. During initial operation, it is positioned to provide cushioning against impact sounds. During normal operation, its parameters adjust to minimize inertial force effects, thereby avoiding increased power consumption and preventing worsening of noise and vibration.
3Object-generated harmful factors
If the buffer member is made larger to improve cushioning effect, then impact sound reduction is enhanced, but weight increases leading to increased inertial force and unbalance force
Solution Approach 1:
The buffer member is designed with non-uniform local quality, having greater thickness or material density in specific areas where cushioning is most needed (such as the area facing the shaft during eccentric rotation). This localized enhancement provides effective impact sound reduction during startup while keeping the overall weight low to minimize inertial and unbalance forces during normal operation.
Solution Approach 2:
The buffer member features an asymmetric design where the cushioning structure is concentrated on one side or in specific regions rather than being uniformly distributed. This asymmetric configuration provides effective cushioning during the specific operational phase when impact sounds occur (initial rotation) while minimizing the overall weight and associated inertial and unbalance forces during normal operation.
Data Source
AI summary
A scroll compressor includes a shaft being rotated by a drive source, an eccentric bush including a recess part into which the shaft is inserted and an eccentric part being eccentric to the shaft, an orbiting scroll configured to perform an orbiting motion in interlock with the eccentric part, a fixed scroll tooth-engaged with the orbiting scroll, and a buffer member configured to prevent an outer periphery of the shaft and an inner periphery of the recess part from coming in contact with each other, wherein the buffer member is formed to be able to perform a relative motion with respect to the shaft and the recess part. Accordingly, the scrolls are prevented from being damaged, an impact sound is prevented from being generated, and an increase of an inertial force and an unbalance force of a rotating body is suppressed.