Coolant Compressor Valve Covering Prevention

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Solution Overview

Problem

Refrigerant compressors in motor vehicles often experience valve finger breakage due to high pressure, leading to complete coverage of outlet openings and increased pressure buildup, which can result in cylinder head destruction.

Innovation Solution

Incorporating a covering prevention device, such as geometric matching of valve fingers and outlet openings, elevations, depressions, or pins, to prevent complete coverage of outlet openings, ensuring a flow channel and maintaining coolant flow.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If valve fingers are provided on the pressure valve to cover openings in the valve plate, then the pressure valve can control refrigerant flow, but the valve fingers can break off under high pressure and completely cover the outlet opening, leading to increased pressure buildup and potential cylinder head destruction

Engineering Contradiction:

Improvepressure valve controlVSAvoidvalve finger breakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A covering prevention device is introduced as an intermediary element between the valve finger and the outlet opening. This device prevents direct contact and complete coverage, allowing refrigerant to escape through flow channels even if the valve finger breaks off, thus preventing excessive pressure buildup and cylinder head destruction

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The covering prevention device is designed in advance to compensate for potential valve finger breakage. By providing elevations, depressions, or pins that prevent complete coverage before failure occurs, the system prepares a safety mechanism that activates only when needed, preventing catastrophic failure

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Productivity

If the outlet opening is made large to ensure refrigerant flow, then cooling efficiency improves, but the risk of complete coverage by broken valve fingers increases, leading to higher pressure buildup

Engineering Contradiction:

Improverefrigerant flowVSAvoidoutlet opening coverage risk

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The outlet opening is designed with non-uniform geometry, incorporating local elevations and depressions in specific areas. This local quality variation ensures that even if a valve finger breaks off and covers part of the outlet opening, refrigerant can still escape through the flow channels created by these geometric features, maintaining cooling efficiency while preventing complete blockage

Inventive Principle:

Principle #3Local quality

Data Source

PatentEP2183483B1Coolant compressor

Publication Date: 2012.05.16 IXETIC BAD HOMBURG

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AI summary

A coolant compressor is proposed, comprising a shaft and at least one piston disposed parallel to the shaft, said piston interacting with a valve device having a pressure valve (3), and further comprising a pressure chamber (11) having at least one outlet opening (21), said pressure chamber being delimited by the pressure valve (3) and a cylinder head (9).