Scroll Compressor Retainer Block Structure for Shorter Bypass Holes

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Solution Overview

Problem

Existing scroll compressors suffer from overcompression and increased dead volume due to lengthy bypass holes and complex fastening structures for bypass valves, leading to decreased efficiency and increased manufacturing costs.

Innovation Solution

A scroll compressor design featuring a block insertion groove in the non-orbiting scroll with a retainer block and block support member, allowing for secure fixation of bypass valves without additional fastening members, reducing bypass hole length and simplifying assembly.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a bypass valve is supported by an elastic member in a separated state, then the bypass valve can open and close the bypass hole, but the number of components increases and modularization becomes difficult

Engineering Contradiction:

Improvebypass valve operationVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The bypass valve is integrated with the bypass hole to form a unified structure. The valve body directly forms the bypass hole, eliminating the need for separate elastic members and multiple components. This merging approach maintains the opening/closing function while reducing component count and enabling modularization.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The valve body serves multiple functions: it forms the bypass hole, provides the opening/closing mechanism, and integrates the elastic member support structure. This multi-functionality eliminates the need for separate components and simplifies the overall design.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If the bypass hole length is increased to accommodate fastening structures, then the bypass valve can be securely fixed, but overcompression occurs due to discharge delay and dead volume increases

Engineering Contradiction:

Improvebypass valve fixationVSAvoidrefrigerant discharge efficiency

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The fastening structure is moved from the bypass hole path to the end plate dimension. The through hole is formed in the end plate rather than extending through the bypass hole, allowing secure fixation without increasing the bypass hole length. This dimensional shift resolves the conflict between fixation security and discharge efficiency.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The fastening function is separated from the bypass hole structure. The through hole in the end plate provides fastening capability independently of the bypass hole, allowing the bypass hole to maintain its optimal short length for efficient refrigerant discharge.

Inventive Principle:

Principle #1Segmentation

3Reliability

If rivets or pins are used to fix the bypass valve to the non-orbiting scroll, then the bypass valve can be securely attached, but the end plate thickness must increase to accommodate rivet depth or pin depth

Engineering Contradiction:

Improvebypass valve attachmentVSAvoidend plate thickness

Core Design Contradiction:

ReliabilityVSLength of stationary object

Solution Approach 1:

The attachment structure is merged with the end plate itself. The through hole formed in the end plate serves as both the attachment feature and structural element, eliminating the need for additional thickness to accommodate separate rivets or pins.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The fastening function is extracted from the bypass valve assembly and integrated into the end plate structure. The through hole in the end plate provides the attachment capability, removing the need for the end plate to be thick enough to accommodate rivet or pin depths.

Inventive Principle:

Principle #2Taking out (Extraction)

4Reliability

If a complex fastening structure is used for the bypass valve, then the bypass valve can be securely fixed, but the assembly process becomes more complex and manufacturing costs increase

Engineering Contradiction:

Improvebypass valve fixationVSAvoidassembly process

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The fastening structure is merged with the end plate as a integrated through hole feature, eliminating the need for separate fastening components and complex assembly steps. This simplifies both manufacturing and assembly processes while maintaining secure fixation.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The end plate's through hole structure provides self-contained fastening capability, eliminating the need for additional fastening components or complex assembly procedures. The structure serves its own fastening function without external assistance.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS20250327447A1Scroll compressor

Publication Date: 2025.10.23 LG ELECTRONICS INC

AI summary

Disclosed is a scroll compressor. The scroll compressor may comprise: a retainer block inserted into a block insertion groove of a non-orbiting scroll; and a block support member that is provided between the retainer block and a back pressure chamber assembly facing same and supports the retainer block toward the non-orbiting scroll. Accordingly, a bypass valve that suppresses overcompression of a compression chamber is not fastened to a non-orbiting end plate, and thus the non-orbiting end plate can be formed thin. Also, the length of a bypass hole decreases as the non-orbiting end plate becomes thinner, thus reducing the dead volume in the bypass hole. In addition, the retainer block can be fixed tightly and securely to the block insertion groove of the non-orbiting scroll.