Scroll Compressor Buffer Member Reduces Vibration Noise

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Solution Overview

Problem

Conventional scroll compressors experience noise vibration issues due to the rotation clearance between the shaft and eccentric bush, leading to shock sounds when the rotating speed is reduced or the shaft is stopped.

Innovation Solution

A scroll compressor design that includes a buffer member between the orbiting groove and balance weight, which compresses between the outer circumferential surface of the balance weight and the inner circumferential surface of the orbiting groove, preventing contact between the eccentric bush and shaft and reducing noise by absorbing the shock.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rotation clearance is provided between the shaft and eccentric bush to prevent scroll breakage during initial operation, then reliability is improved, but noise vibration increases when rotating speed is reduced or shaft is stopped

Engineering Contradiction:

Improvescroll breakage preventionVSAvoidnoise vibration

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A buffer member is introduced as an intermediary element between the balance weight and the orbiting groove. This buffer member absorbs the shock and prevents direct contact between the eccentric bush and shaft, thereby eliminating noise vibration while preserving the rotation clearance needed for reliability during initial operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer member is positioned in advance between the balance weight and orbiting groove to cushion against potential shock and contact. This pre-positioned cushioning prevents the harmful contact that would otherwise occur when rotation speed is reduced or the shaft stops, without interfering with normal operation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Ease of operation

If rotation clearance is provided between the shaft and eccentric bush, then smooth operation during liquid refrigerant compression is improved, but impact noise occurs when the shaft stops

Engineering Contradiction:

Improvesmooth operationVSAvoidimpact noise

Core Design Contradiction:

Ease of operationVSObject-generated harmful factors

Solution Approach 1:

The buffer member serves as a mediator that absorbs impact forces when the shaft stops or slows down, preventing direct contact between the eccentric bush and shaft. This eliminates impact noise while preserving the rotation clearance necessary for smooth operation during liquid refrigerant compression.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The buffer member converts the harmful impact force into a beneficial cushioning effect. By absorbing the shock when the shaft stops or slows, the buffer member transforms what would be damaging impact noise into a controlled, dampened motion that protects the scroll compressor components.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 buffer member effectively absorbs the shock between the eccentric bush and shaft, preventing breakage and noise, ensuring stable operation and reduced vibration even at reduced speeds or when the shaft is stopped.

Implementation Method 1

a buffer member (900) which is compressed between the outer circumferential surface (432) of the balance weight (430) and the inner circumferential surface (114a) of the orbiting groove (114)

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS11261864B2Scroll compressor with buffer member between the orbiting groove and the balance weight

Publication Date: 2022.03.01 HANON SYST CO LTD

AI summary

Scroll compressor includes a shaft rotatably supported to a casing; an eccentric bush having a recess part into which one end portion of the shaft is inserted, an eccentric part eccentric to the shaft, and a balance weight disposed at the opposite side of the eccentric part with respect to the recess part; an orbiting scroll for performing the orbiting motion in interlock with the eccentric part; and a fixed scroll for forming a compression chamber together with the orbiting scroll. The casing has an orbiting groove in which the eccentric bush performs the orbiting motion, a buffer member is interposed between the orbiting groove and the balance weight. Rotation clearance is formed between the recess part and the shaft. The buffer member is compressed between the balance weight and the orbiting groove before the recess part and the shaft contact each other by the rotation clearance.