Scroll Compressor Oil Discharge Grooves for Radial Lubrication

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Solution Overview

Problem

Existing scroll compressors inadequately supply oil to the radially inward spaces of the compression chamber, leading to inefficient lubrication and sealing performance.

Innovation Solution

The design includes oil discharge grooves on the facing surface of the fixed scroll that communicate with the suction port through an oil collection path, ensuring oil is supplied to both radially inward and outward spaces of the movable scroll, with an intermittent communication mechanism to prevent excessive oil discharge and heat dissipation in the oil collection path.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If the movable-side oil groove communicates with the compression chamber space radially outward of the movable scroll, then oil is supplied to the radially outward space, but oil supply to the radially inward space is insufficient

Engineering Contradiction:

Improveoil supply quantityVSAvoidlubrication performance

Core Design Contradiction:

Quantity of substanceVSReliability

Solution Approach 1:

The oil discharge mechanism is segmented into multiple discharge ports: a first oil discharge port communicating with the radially outward space and a second oil discharge port communicating with the radially inward space. This segmentation allows independent oil supply to different regions, resolving the contradiction by ensuring both spaces receive adequate oil for reliable lubrication.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the compression chamber are provided with different oil supply characteristics. The first oil discharge port supplies oil to the radially outward space while the second oil discharge port supplies oil to the radially inward space. This local differentiation ensures each region receives appropriate oil quantity and distribution for optimal lubrication performance.

Inventive Principle:

Principle #3Local quality

2Reliability

If continuous oil supply is provided to the compression chamber, then lubrication is maintained, but excessive oil discharge and heat generation occur

Engineering Contradiction:

Improvelubrication continuityVSAvoidheat dissipation

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The oil supply system employs periodic action through the intermittent communication mechanism. The third oil discharge port is selectively opened or closed based on operational conditions, providing oil supply in periodic cycles rather than continuously. This maintains lubrication reliability while reducing excessive oil discharge and associated heat generation during periods when full lubrication is not required.

Inventive Principle:

Principle #19Periodic action

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 enhances oil sealing performance by evenly distributing oil to all areas of the compression chamber, reducing leakage and improving the overall efficiency of the scroll compressor.

Implementation Method 1

an oil collection path (90) which is provided apart from the facing surface and through which the oil discharger (81, 82) communicates with a suction port (64) of the compression chamber (S)

Methodology Applied

Scientific EffectFluid flow through communication path:

Implementation Method 2

an intermittent communication mechanism (87) configured to allow the oil supplier (80) to intermittently communicate with the oil discharger (81, 82)

Methodology Applied

Scientific EffectIntermittent fluid flow:

Implementation Method 3

heat dissipation in the oil collection path

Methodology Applied

Scientific EffectHeat dissipation:

Data Source

PatentEP3933202B1Scroll compressor

Publication Date: 2023.06.07 DAIKIN INDUSTRIES LTD

Figure 1
Figure 2~3
Figure 4

AI summary

First and second oil discharge grooves (81, 82) are formed in a facing surface of a fixed scroll (60). Part of first and second oil discharge grooves (81, 82) is open at a position radially outward of a sliding range of a movable scroll (70). The first and second oil discharge grooves (81, 82) and a suction port (64) of a compression chamber (S) communicate with each other through an oil collection path (90).