Compressor Casing Tapered Sealing for Roller Assembly

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Solution Overview

Problem

Conventional vertical split type compressors face difficulties in assembly due to the bundle roller struggling to move over steps on the inner casing surface, leading to potential scratches and leakage if flaws occur, making it challenging for non-experts to assemble the compressor.

Innovation Solution

The inner circumferential surface of the compressor casing features a tapered connection between sealing surfaces, allowing the bundle roller to roll smoothly during assembly and disassembly, preventing scratches and maintaining sealing integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If steps are provided on the inner circumferential surface of the casing to minimize clearance, then the sealing performance is improved, but the bundle roller cannot move smoothly and may cause scratches

Engineering Contradiction:

Improvesealing performanceVSAvoidassembly ease

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The inner circumferential surface is divided into multiple sealing surfaces separated by steps, with tapered connection portions between them. This segmentation allows the roller to move through each step via the tapered transition zones while maintaining multiple sealing contact points for reliable sealing performance.

Inventive Principle:

Principle #1Segmentation

2Manufacturing precision

If steps are provided on the inner circumferential surface of the casing, then the clearance is minimized, but the bundle roller may develop flaws when moving over steps

Engineering Contradiction:

Improveclearance controlVSAvoidsurface integrity

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The tapered connection portions are pre-formed on the inner circumferential surface before assembly. These pre-formed tapered guides prepare the path for the roller, enabling it to transition smoothly over steps without sudden impacts that could cause surface flaws or defects.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If steps are provided on the inner circumferential surface of the casing, then the sealing contact is improved, but the assembly process becomes difficult for non-experts

Engineering Contradiction:

Improvesealing contactVSAvoidassembly difficulty

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The tapered connection portions act as intermediary transition zones between the stepped sealing surfaces. These intermediaries guide the roller smoothly through the assembly process, making the operation intuitive and easy to perform even for non-experts while maintaining reliable sealing contact at each step.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP2679830B1Compressor and method of assembling the same

Publication Date: 2021.01.20 MITSUBISHI HEAVY INDUSTIES COMPRESSOR CORP

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AI summary

A compressor casing to allow easy assemblage and disassembling, a compressor provided with the same, and a method of assembling the compressor are provided. The compressor casing includes a substantially tubular casing (3), a plurality of sealing surfaces (6) provided on an inner circumferential surface of the casing (3) along an axial direction thereof, a sealing means (7) provided for each sealing surface (6), a substantially cylindrical bundle (2) for accommodating a blade inside and for being assembled to the casing (3) so as to contact with the sealing surfaces (6), and a roller provided on an outer circumferential surface of the bundle (2), for rolling on the inner circumferential surface of the casing (3) when the bundle (2) is assembled to or removed from the casing (3). The sealing surfaces (6) are connected with one another tapered surfaces.