Scroll Compressor Bed Plate Channels for Oil Distribution

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing scroll compressors face oiling shortages due to asymmetric tooth profiles, which compromise lap strength and lead to inefficient oil distribution between external and internal line side compression rooms, resulting in inadequate lubrication and reduced reliability.

Innovation Solution

A scroll compressor design featuring an asymmetric tooth profile with fluid effluence channels and communicating section control grooves on the bed plate, allowing intermittent communication between the back pressure room and compression rooms, ensuring oil supply to both external and internal line side compression rooms without sacrificing lap strength.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If oil feed channels are provided within the scroll lap to supply oil to compression rooms, then oil supply is improved, but the strength of the lap is adversely affected

Engineering Contradiction:

Improveoil supplyVSAvoidlap strength

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent extracts the oil feed channels from the scroll lap structure and relocates them to the bed plate. This separation allows the lap to maintain its structural integrity while still achieving reliable oil supply to the compression rooms through the bed plate channels, resolving the contradiction between oil supply and lap strength.

Inventive Principle:

Principle #2Taking out (Extraction)

2Strength

If the scroll compressor has an asymmetric tooth profile with oil inlet opening toward tooth bottom, then lap strength is maintained, but only one compression room can communicate with the back pressure room, causing oiling shortage in the other compression room

Engineering Contradiction:

Improvelap strengthVSAvoidoil supply to compression rooms

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent segments the oil supply system by providing separate oil feed channels in the bed plate for each compression room (external line side and internal line side). This segmentation allows both compression rooms to independently receive oil supply from the back pressure room through their respective channels, eliminating the oiling shortage problem while maintaining lap strength through the asymmetric tooth profile design.

Inventive Principle:

Principle #1Segmentation

3Reliability

If fluid effluence channels are formed on the bed plate with inlet openings facing each other, then oil supply to both compression rooms is improved, but the structure becomes more complex

Engineering Contradiction:

Improveuniform oil distributionVSAvoidchannel structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent merges the oil supply function into the existing bed plate structure by forming fluid effluence channels within it. The inlet openings of these channels are positioned to face each other across the bed plate, creating a unified structure that simultaneously provides oil supply to both compression rooms without adding separate complex oil delivery systems.

Inventive Principle:

Principle #5Merging (Combining)

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 prevents oiling shortages, maintains stable pressure in the back pressure room, reduces energy losses, and enhances the reliability and efficiency of the scroll compressor by ensuring uniform oil distribution and appropriate lubrication.

Implementation Method 1

the compression room is compressed by reducing its volume by orbiting the orbiting scroll

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 2

a communicating section control groove that lets the back pressure room and the external line side compression room intermittently communicate with each other by letting the inlet side opening of the fluid effluence channel for the external line side compression room and the back pressure room intermittently communicate with each other along with the orbiting motion of the orbiting scroll

Methodology Applied

Scientific EffectPressure gradient driven flow: Pressure Gradient

Data Source

PatentUS9181945B2Scroll compressor with channels intermittently communicating internal and external compression chambers with back pressure chamber

Publication Date: 2015.11.10 HITACHI JOHNSON CONTROLS AIR CONDITIONING INC

AI summary

The lap shapes of a fixed scroll and an orbiting scroll are configured in an asymmetric tooth profile. In the bed plate of an orbiting scroll, a fluid effluence channel communicating with an external line side compression room of an orbiting scroll lap and another fluid effluence channel communicating with an internal line side compression room are formed, and the outlet side opening of each fluid effluence channel opens in the lap tooth bottom of the orbiting scroll, and inlet side openings are formed in a face of the bed plate that is in sliding contact with the bed plate face of the fixed scroll. In the face of the bed plate, a communicating section control groove that lets the inlet side openings of the two fluid effluence channels and the back pressure room intermittently communicate with each other.