Compressor Guide Pipe Cylinder Position Stability

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Solution Overview

Problem

In compressor systems, the cylinder may shift due to pressure from the intake pipe, affecting the compressor's operation, as it is not directly fixed to the housing but rather supported by a bearing apparatus, leading to instability in the axial center position.

Innovation Solution

The compressor system incorporates a guide pipe with a large diameter portion and a widening diameter portion, and a suction pipe with corresponding diameter portions, where the suction pipe's outer surface abuts the guide pipe's inner surface, preventing the cylinder from being pushed and ensuring stable operation by maintaining the cylinder's position.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If the cylinder is supported by a bearing apparatus instead of being directly fixed to the housing, then the ease of assembly and maintenance is improved, but the stability of the cylinder position deteriorates

Engineering Contradiction:
Improveease of assemblyVSAvoidcylinder position stability
Core Design Contradiction:
Ease of manufactureVSStability of the object's composition

Solution Approach 1:

The guide pipe acts as an intermediary component between the suction pipe and the cylinder. It provides a stable reference structure that prevents the suction pipe from pushing the cylinder, while allowing the cylinder to remain supported by the bearing apparatus for ease of assembly and maintenance.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Device complexity

If the suction pipe is inserted directly into the cylinder without a guide pipe, then the device complexity is reduced, but the cylinder position stability deteriorates

Engineering Contradiction:
Improvestructure complexityVSAvoidcylinder position stability
Core Design Contradiction:
Device complexityVSStability of the object's composition

Solution Approach 1:

The guide pipe serves as a mediator that provides structural support and positioning guidance. It prevents the suction pipe from directly pushing the cylinder, thereby maintaining position stability without requiring direct fixation of the cylinder to the housing.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The guide pipe creates a stable reference position for the suction pipe insertion, ensuring that the cylinder maintains a consistent axial center position regardless of insertion variations, achieving positional equipotentiality.

Inventive Principle:
Principle #12Equipotentiality

3Reliability

If the suction pipe pushes the cylinder during insertion, then the sealing between components is improved, but the cylinder position stability deteriorates

Engineering Contradiction:
Improvesealing performanceVSAvoidcylinder position stability
Core Design Contradiction:
ReliabilityVSStability of the object's composition

Solution Approach 1:

The guide pipe acts as an intermediary that absorbs the pushing force from the suction pipe insertion. It transmits this force to the housing structure rather than allowing it to push the cylinder, thereby maintaining sealing performance through proper component contact while preserving cylinder position stability.

Inventive Principle:
Principle #24Intermediary (Mediator)

Data Source

PatentEP3550146B1Compressor system
Publication Date: 2021.05.19 MITSUBISHI HEAVY IND THERMAL SYST
  • EP3550146B1 patent drawingFigure 1
  • EP3550146B1 patent drawingFigure 2
  • EP3550146B1 patent drawingFigure 3

AI summary

The compressor system includes guide pipes (30A and 30B) fixed to a housing (11), and suction pipes (26A and 26B) inserted through suction ports (23A and 23B) formed in a cylinder accommodated in the housing (11). The guide pipes (30A and 30B) each have a guide pipe widening diameter portion (303A) having a diameter that gradually increases. The suction pipes (26A and 26B) have a suction pipe widening diameter portion (263A) having a diameter that gradually increases from a suction pipe small diameter portion (261A) side inserted through a guide pipe small diameter portion (301A) toward a suction pipe large diameter portion (262A) having a diameter larger than that of the guide pipe small diameter portion (301A), and having an outer circumferential surface that abuts an inner circumferential surface of a guide pipe widening diameter portion (303A).