Refrigerant System Bypass Valve for Compressor Pressure Equalization

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Solution Overview

Problem

The high pressure difference between the oil separator and the compressor in refrigerant systems leads to increased load on the compressor, potential damage to internal components, and reduced operating efficiency, along with increased energy consumption.

Innovation Solution

A refrigerant system with a bypass solenoid valve and oil solenoid valve is used to equalize pressure differences between the oil separator and evaporator, ensuring lubrication before startup and controlled shutdown to minimize load and energy consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the oil separator is under high pressure to separate refrigerant and oil effectively, then the separation function is improved, but the compressor experiences huge start-up load and potential bearing damage

Engineering Contradiction:

Improveoil separation functionVSAvoidcompressor start-up load and bearing damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The bypass solenoid valve is opened before compressor startup to equalize pressure between the oil separator and evaporator in advance. This preliminary pressure equalization action prevents the huge pressure difference from causing excessive start-up load and bearing damage, while maintaining effective oil separation during operation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bypass pipe acts as an intermediary pressure equalization path between the oil separator and evaporator. By opening the bypass solenoid valve, refrigerant can flow through this intermediary path to balance pressures, protecting the compressor from direct high-pressure冲击 during startup.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the compressor operates under high pressure difference conditions, then the refrigeration efficiency is improved, but the energy consumption increases and operating efficiency declines

Engineering Contradiction:

Improverefrigeration efficiencyVSAvoidcompressor energy consumption

Core Design Contradiction:

ProductivityVSUse of energy by moving object

Solution Approach 1:

The system dynamically adjusts the bypass solenoid valve state based on operating conditions. During startup, the valve is opened to reduce pressure difference and energy consumption. During normal operation, the valve is closed to maintain efficient refrigeration cycles, achieving optimal performance at different operational phases.

Inventive Principle:

Principle #15Dynamics

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 solution reduces start-up load on the compressor, prevents damage to internal components, and enhances operating efficiency while reducing energy consumption.

Implementation Method 1

The bypass solenoid valve is disposed on the bypass pipe to equalize a pressure difference between the oil separator and the evaporator

Methodology Applied

Scientific EffectPressure equalization: Pressure Gradient

Implementation Method 2

The high-pressure gaseous refrigerant and the lubricating oil are first transported to the oil separator, which separates the high-pressure gaseous refrigerant and the lubricating oil

Methodology Applied

Scientific EffectCentrifugal separation: Centrifugal Separation

Implementation Method 3

the compressor extracts the low-pressure gaseous refrigerant from the evaporator and compresses the low-pressure gaseous refrigerant into high-pressure gaseous refrigerant

Methodology Applied

Scientific EffectMechanical compression: Compression

Implementation Method 4

The high-pressure gaseous refrigerant is exothermic in the condenser to form high-pressure liquid refrigerant

Methodology Applied

Scientific EffectExothermic condensation: Condensation

Implementation Method 5

The high-pressure gaseous refrigerant is exothermic in the condenser to form high-pressure liquid refrigerant

Methodology Applied

Scientific EffectHeat exchange: Heat Exchanger

Implementation Method 6

the high-pressure liquid refrigerant flows through the expansion valve and is depressurized to a low-pressure liquid refrigerant

Methodology Applied

Scientific EffectThrottling depressurization: Pressure Drop

Implementation Method 7

the low-pressure liquid refrigerant flows into the evaporator and absorbs heat in the evaporator to form low-pressure gaseous refrigerant

Methodology Applied

Scientific EffectEndothermic evaporation: Evaporation

Data Source

PatentUS12601530B2Refrigerant system and controlling method thereof for equalizing pressure difference between oil separator and evaporator

Publication Date: 2026.04.14 FUSHENG IND CO LTD

AI summary

A refrigerant system including a compressor, an oil separator, an oil solenoid valve, a condenser, an evaporator, a bypass pipe, and a bypass solenoid valve is disclosed. The oil separator is connected to an output end of the compressor. The oil solenoid valve is disposed between the oil cooler and the compressor. The condenser is connected to the oil separator. The evaporator is connected to the condenser. The bypass pipe has a first end and a second end opposite to the first end. The first end is connected between the oil separator and the condenser, and the second end is connected between the evaporator and an input end of the compressor. The bypass solenoid valve is disposed on the bypass pipe. A controlling method for the refrigerant system is also disclosed.