Scroll Compressor End Plate Oil Drain Passage

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Solution Overview

Problem

The existing scroll compressor design experiences increased power loss due to the eccentric rotation of the movable scroll's end plate, which causes stirring loss of lubricating oil in the annular space, leading to inefficiencies in the compression mechanism.

Innovation Solution

Incorporating a back-pressure chamber and an oil drain groove on the movable scroll's end plate, which allows oil from the annular space to flow into the compression chamber via a movable-side passage, reducing oil pressure and stirring loss by guiding the oil back into the compression mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the movable scroll eccentrically rotates in the annular space, then the compression mechanism operates, but the oil is stirred and power loss increases

Engineering Contradiction:

Improvepower lossVSAvoidstirring loss of oil

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The patent extracts the oil from the annular space by providing a communication passage that allows oil to flow from the annular space into the compression chamber, thereby removing the source of stirring loss while maintaining compression operation

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The communication passage acts as an intermediary channel that mediates oil flow between the annular space and compression chamber, enabling oil to be transferred without direct stirring in the annular space

Inventive Principle:

Principle #24Intermediary (Mediator)

2Strength

If the end plate is thickened to maintain structural integrity, then strength is improved, but manufacturing complexity increases

Engineering Contradiction:

Improveend plate strengthVSAvoidprocessability

Core Design Contradiction:

StrengthVSEase of manufacture

Solution Approach 1:

The patent introduces a new dimensional aspect by creating a communication passage through the end plate that allows oil flow in the radial direction, enabling the end plate to maintain structural integrity without excessive thickening

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 configuration effectively reduces power loss and oil pressure in the annular space, enhancing the efficiency of the compression mechanism by utilizing the oil for lubrication and reducing the need for thickening the end plate, thus improving processability and structural simplicity.

Implementation Method 1

This configuration therefore enables a drain of the oil from the annular space (65) to suppress stirring loss of the oil

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Data Source

PatentEP3779196B1Scroll compressor

Publication Date: 2021.09.01 DAIKIN INDUSTRIES LTD

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AI summary

A compression mechanism (30) has a back-pressure chamber (19) defined on a back face of an end plate (51) of a movable scroll (50). The compression mechanism (30) has an annular space (65) defined at an outer periphery of the end plate (51) of the movable scroll (50). The movable scroll (50) has a movable-side passage (55) through which a compression chamber (56) intermittently communicates with the back-pressure chamber (19) in accordance with eccentric rotation of the movable scroll (50). The end plate (51) of the movable scroll (50) has a communication space (70, 76) through which the movable-side passage (55) communicates with the annular space (65).