Outer Rotor Compressor Cylinder Block Vibration Control

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Solution Overview

Problem

Compressors with inner rotor type motors face challenges in vibration attenuation, rigidity reinforcement, and heat radiation due to unbalanced moments and mass distribution, particularly during rapid speed changes and start/stop operations.

Innovation Solution

The compressor design incorporates an outer rotor type motor with a cylinder block that distributes mass outwardly to enhance rotation inertia, includes a noise chamber for vibration attenuation, and utilizes oil holes for heat radiation, featuring a shaft support and multiple radial supports to connect and reinforce the structure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If mass is concentrated at the center of the cylinder block, then structural compactness is improved, but rotation inertia is reduced leading to increased vibration during rapid speed changes

Engineering Contradiction:

Improvestructural compactnessVSAvoidrotation inertia

Core Design Contradiction:

Stability of the object's compositionVSForce

Solution Approach 1:

The patent redistributes mass from a centralized configuration to a peripheral configuration by positioning the cylinder bore and piston assembly away from the center of the cylinder block. This dimensional redistribution increases the moment of inertia about the rotation axis, thereby reducing vibration during rapid speed changes while maintaining structural compactness through the integrated support structures.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Weight of moving object

If the cylinder block structure is simplified to reduce weight, then manufacturing cost is reduced, but rigidity is compromised affecting vibration attenuation

Engineering Contradiction:

Improvecylinder block weightVSAvoidstructural rigidity

Core Design Contradiction:

Weight of moving objectVSStrength

Solution Approach 1:

The cylinder block is segmented into functional zones: a central support structure for rotational stability, a peripheral cylinder bore for compression, and integrated noise chambers for vibration attenuation. This segmentation allows each zone to be optimized independently - the central structure provides rigidity while the peripheral elements provide compression space, achieving both weight reduction and structural strength.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs composite construction by integrating multiple functional elements (cylinder bore, noise chambers, support structures) into a unified cylinder block assembly. This composite approach allows the structure to achieve high rigidity-to-weight ratio by combining structural support functions with compression and vibration attenuation functions in a single integrated component.

Inventive Principle:

Principle #40Composite materials

3Temperature

If the cylinder block is designed with minimal mass distribution, then heat radiation efficiency is improved, but rotation inertia is reduced causing increased mechanical vibration

Engineering Contradiction:

Improveheat radiation efficiencyVSAvoidrotation inertia

Core Design Contradiction:

TemperatureVSForce

Solution Approach 1:

The cylinder block features localized mass concentration at the periphery where the cylinder bore is positioned, creating a weight imbalance that increases rotation inertia. This local quality modification allows the overall structure to remain lightweight for heat radiation efficiency while the specific peripheral mass distribution provides the necessary rotational stability to reduce vibration during operation.

Inventive Principle:

Principle #3Local quality

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 improves vibration attenuation, reinforces rigidity, and enhances heat radiation characteristics, resulting in improved motor performance and reduced noise and vibration.

Implementation Method 1

a noise chamber defined at at least one side of the cylinder portion

Methodology Applied

Scientific EffectAcoustic absorption: Acoustic Absorption

Implementation Method 2

radiating heat of a stator fixed to a rotary shaft portion through oil

Methodology Applied

Scientific EffectHeat conduction: Conduction (thermal)

Implementation Method 3

radiating heat of a stator fixed to a rotary shaft portion through oil

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11536258B2Compressor including cylinder block corresponding to outer rotor type motor

Publication Date: 2022.12.27 LG ELECTRONICS INC

AI summary

A cylinder block for a compressor includes: a shaft support configured to support a rotary shaft of an outer rotor type motor; a first support that is arranged radially outward of the shaft support and that extends along a circumferential direction about a center of the shaft support; a second support that is arranged radially outward of the first support and that extends along the circumferential direction about the center of the shaft support; a third support that connects the first support to the second support; a cylinder portion that defines a cylindrical inner space at a position radially away from the center of the shaft support; and a noise chamber defined at at least one side of the cylinder portion.