Hermetic Compressor Integrated Accumulator Design
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Solution Overview
Problem
Hermetic compressors with external accumulators face issues of increased size, complex assembly processes, and higher refrigerant leakage due to separate connections, limiting design flexibility and efficiency.
Innovation Solution
A hermetic compressor design where the accumulator is integrated within the shell, using a cylindrical shell with a stator, rotor, and stationary shaft, and a manufacturing method that includes a shrink-fit assembly of the stator and lower frame, temporary gap-maintainer insertion, and coupling of the accumulator to the stationary shaft, simplifying assembly and reducing leakage risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the accumulator is installed at an outer portion of the shell, then the accumulator can be separately connected to the shell, but the size of the compressor increases and design flexibility is limited
Solution Approach 1:
The accumulator is integrated within the shell by forming an accumulating chamber using the internal space of the shell, merging the accumulator and compressor shell into a single unified structure. This eliminates the need for separate external installation and reduces overall compressor size while simplifying assembly.
Solution Approach 2:
The accumulator chamber is nested within the shell structure, with the accumulating chamber formed by the internal space of the shell. The shell serves dual purposes as both the compressor housing and the accumulator container, optimizing space utilization.
2Reliability
If the accumulator is connected to a separate suction pipe at the outside of the shell, then the assembly works of the shell and accumulator can be isolated, but the assembly process becomes complex and the number of connecting portions increases
Solution Approach 1:
The accumulator and compressor shell are merged into a single integrated structure, eliminating separate connecting portions for refrigerant pipes. This reduces the number of potential leakage points while simplifying the assembly process as the components are manufactured as one unified unit.
3Ease of manufacture
If the accumulator is installed at the outside of the shell, then the assembly process can be isolated, but the area occupied by the compressor increases
Solution Approach 1:
The accumulator is combined with the compressor shell to form an integrated unit, eliminating the need for separate external installation. This reduces the overall area occupied by the compressor while maintaining manufacturing feasibility through unified production processes.
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 integrated accumulator design reduces the compressor's size, simplifies assembly, and minimizes refrigerant leakage, enhancing manufacturing efficiency and design flexibility.
Implementation Method 1
fixing the lower frame and the stator to inside of a cylindrical shell by a shrink fit
Data Source
AI summary
A hermetic compressor is provided. The hermetic compressor includes a cylindrical shell; a stator fixed to an inner surface of the shell; a rotor rotatably installed with respect to the stator; a compression device combined with the rotor to be rotated together with the rotor; a stationary shaft including an eccentric portion around which the compression device is supported to be stationary with respect to a longitudinal direction thereof; an accumulator fixed to an inside of the shell in such a manner so as to seal an upper end of the shell and fixedly support a first end of the stationary shaft above the stator; a lower frame fixed to the inside of the shell, that fixedly supports a second end of the stationary shaft; an upper cap to seal an upper end of the accumulator; and a lower cap to seal a lower end of the shell.