Refrigerant bypass solution

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Solution Overview

Problem

Filter-type oil separators in cooling systems face efficiency decreases at medium compressor speeds, leading to unsatisfactory oil levels in the compressor, affecting both compressor durability and oil separation efficiency.

Innovation Solution

A system with a bypass line and valve that adjusts based on compressor speed, bypassing a portion of the refrigerant and lubricant around the filter-type oil separator, managed by a controller that calculates refrigerant gas flow rate and adjusts the bypass valve openness accordingly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If all compressed mixture passes through the filter-type oil separator, then oil separation is achieved, but compressor speed control becomes limited and oil level becomes insufficient at medium speeds

Engineering Contradiction:

Improveoil level in compressorVSAvoidcompressor speed range

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The compressed mixture flow is divided into two separate paths: one path directs a first portion through the filter-type oil separator for oil separation, while another path directs a second portion through a bypass line around the separator. This segmentation allows the system to maintain oil separation functionality while enabling flexible speed control across a broader range, resolving the contradiction between reliable oil level maintenance and adaptability to different compressor speeds.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system dynamically changes the flow distribution parameter by adjusting the bypass valve opening based on compressor speed. At medium compressor speeds, the bypass valve opens to allow more mixture to bypass the separator, preventing oil level depletion. This parameter adjustment enables the system to adapt to varying operating conditions while maintaining sufficient oil levels, resolving the contradiction between reliability and adaptability.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If bypass line is added to the system, then compressor speed adaptability improves, but device complexity increases

Engineering Contradiction:

Improvecompressor speed rangeVSAvoidseparator system structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The bypass line and bypass valve are integrated into the existing oil separator system, allowing the same hardware to serve multiple functions: oil separation when the bypass valve is closed and flow diversion when the bypass valve is open. This multi-functionality approach enables expanded compressor speed adaptability without proportionally increasing device complexity, as the bypass components work in conjunction with rather than alongside the separator.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If bypass valve is adjusted to maintain oil level, then oil reclamation efficiency improves, but refrigerant flow through separator decreases

Engineering Contradiction:

Improveoil reclamation efficiencyVSAvoidrefrigerant flow through separator

Core Design Contradiction:

ProductivityVSQuantity of substance

Solution Approach 1:

Instead of directing all compressed mixture through the bypass line, the system uses partial action by adjusting the bypass valve to allow only a second portion of the mixture to bypass the separator. This partial bypass maintains sufficient refrigerant flow through the separator to sustain oil reclamation efficiency while providing enough bypass flow to prevent oil level depletion at medium compressor speeds, resolving the contradiction between productivity and quantity of substance.

Inventive Principle:

Principle #16Partial or excessive 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

Maintains a sufficient oil level in the compressor, improving both compressor and oil separator efficiency by optimizing oil reclamation and reducing refrigerant flow through the separator.

Implementation Method 1

a bypass line configured to bypass a second portion of the compressed mixture of refrigerant and lubricant around the filter-type oil separator

Methodology Applied

Scientific EffectFluid flow:

Implementation Method 2

receiving a first pressure value from a first pressure transducer at a suction side of the compressor, receiving a second pressure value from a second pressure transducer at the discharge side of the compressor

Methodology Applied

Scientific EffectPressure measurement:

Implementation Method 3

The filter-type oil separator achieves oil separation by passing the mixture through baffling and filters, thereby causing oil particles to combine and form heavier particles as they flow down an inner wall of the separator

Methodology Applied

Scientific EffectFiltration: Filter (physical)

Implementation Method 4

a compressor configured to compress and pressurize a mixture of refrigerant and lubricant

Methodology Applied

Scientific EffectCompression: Compression

Data Source

PatentUS12104836B2Refrigerant bypass solution

Publication Date: 2024.10.01 SCHNEIDER ELECTRIC IT CORP

AI summary

Systems, methods, and computer-readable mediums are provided for improving the efficiency of a filter-type oil separator in a cooling system including a compressor that pumps a mixture of lubricating oil and refrigerant through the filter-type oil separator. The filter type oil separator is configured to receive a first portion of the mixture from the compressor, and a bypass line is configured to bypass a second portion of the mixture around the filter-type oil separator. The bypass line ensures a sufficient amount of oil is present in the compressor.