Scroll Compressor Blocking Structure for Oil Mist Separation

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Solution Overview

Problem

Existing compressors face challenges in efficiently separating oil mist from compressed gas refrigerant, leading to increased oil loss and reduced efficiency due to the deposition and scattering of oil on internal components.

Innovation Solution

Incorporation of a blocking part on components like the oil return guide, gas guide, and lower frame to prevent oil deposition by redirecting the flow of gas refrigerant and guiding lubricant back to the reservoir, thereby reducing oil scattering and enhancing compressor efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of substance

If a gas guide with circumferential guide portion is used to create swirling flow for oil separation, then oil separation capability is improved, but oil deposition on facing surfaces occurs due to collision of gas flow

Engineering Contradiction:

Improveoil lossVSAvoidoil deposition on facing surfaces

Core Design Contradiction:

Loss of substanceVSObject-generated harmful factors

Solution Approach 1:

The invention converts the harmful effect of gas flow collision (which causes oil deposition) into a beneficial separation mechanism. By strategically positioning blocking parts, the collision that would normally deposit oil is redirected to push oil toward collection areas, transforming a harmful deposition effect into a useful separation and collection mechanism.

Inventive Principle:

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

Solution Approach 2:

The blocking part acts as an intermediary element between the gas flow and the facing surface. Instead of allowing direct collision between gas flow and the facing surface (which causes oil deposition), the blocking part intercepts the gas flow and redirects it, preventing oil from depositing on the facing surface while maintaining the swirling flow's oil separation capability.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If lubricant is supplied to sliding parts for compression mechanism, then compression efficiency is improved, but oil mist mixes with compressed gas refrigerant leading to oil loss

Engineering Contradiction:

Improvecompression efficiencyVSAvoidoil loss

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The invention segments the compressor internal space into distinct zones: a lubrication zone where oil is supplied to sliding parts for efficient compression, and a separation zone where oil mist is separated from compressed gas. The blocking parts create spatial separation between these functions, allowing lubricant to be supplied where needed while preventing oil mist from contaminating the discharge gas.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention extracts oil mist from the compressed gas stream using the blocking parts and swirling flow mechanism. The blocking parts create regions where oil mist can be separated and removed from the gas flow, extracting the harmful oil component while maintaining the beneficial compression function.

Inventive Principle:

Principle #2Taking out (Extraction)

3Loss of substance

If blocking part is added to prevent oil deposition, then oil loss is reduced, but device complexity increases

Engineering Contradiction:

Improveoil lossVSAvoidstructure complexity

Core Design Contradiction:

Loss of substanceVSDevice complexity

Solution Approach 1:

The blocking parts are designed to perform multiple functions simultaneously: they block gas flow to prevent oil deposition, create swirling motion for oil separation, define separation zones, and guide oil mist toward collection areas. This multi-functionality reduces the need for additional separate components, minimizing the increase in device complexity while achieving effective oil loss prevention.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 blocking parts effectively minimize oil loss by preventing oil from being redeposited and scattered, maintaining compressor efficiency and performance.

Implementation Method 1

a collision of the gas flow... block a flow of oil deposited on the facing surface due to a collision of the gas flow

Methodology Applied

Scientific EffectDeposition: Deposition (physical)

Implementation Method 2

redirecting the flow of gas refrigerant and guiding lubricant back to the reservoir

Methodology Applied

Scientific EffectFluid flow redirection:

Data Source

PatentUS12571394B2Scroll compressor with blocking part for oil separation

Publication Date: 2026.03.10 DAIKIN INDUSTRIES LTD

AI summary

A compressor includes a casing, an electric motor housed in the casing, and a compression mechanism driven by the electric motor. The compression mechanism discharges a gas compressed to an internal space of the casing. The gas discharged from the compression mechanism forms a gas flow that flows in a predetermined direction in the internal space of the casing. A component having a facing surface that faces against the gas flow is arranged in the internal space of the casing. The component is provided with a blocking part configured to block a flow of oil deposited on the facing surface due to a collision of the gas flow.