Hermetic Compressor Centrifugal Pump Aperture Plate Assembly
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Solution Overview
Problem
Conventional hermetic compressors produce fine metal powder during manufacturing due to inadequate chamfering or burr removal at the tip-end outer circumference of the oil-feeding pipe, which can lead to compressor failure as the powder mixes with lubricating oil and accumulates in sliding parts.
Innovation Solution
The hermetic compressor incorporates a centrifugal pump with a cylindrical portion and an aperture plate that is plastically deformed to securely contact the cylindrical portion, preventing the production of fine metal powder during assembly and ensuring reliable operation by maintaining the aperture plate's position without dropping or removing it from the opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tip-end outer circumference of the oil-feeding pipe is press-fitted into the shaft opening without adequate chamfering or burr removal, then the assembly process is simple and fast, but fine metal powder is produced that contaminates the lubricating oil and causes compressor failure
Solution Approach 1:
The harmful factor (tip-end outer circumference of oil-feeding pipe) is extracted and separately processed through chamfering and burr removal operations before assembly, eliminating the source of metal powder contamination while maintaining assembly efficiency
Solution Approach 2:
Chamfering and burr removal are performed as preliminary actions on the oil-feeding pipe before the press-fit assembly operation, preventing metal powder generation during assembly while maintaining production efficiency
2Ease of manufacture
If the aperture plate is simply inserted into the cylindrical portion without plastic deformation, then the assembly process is simple, but the aperture plate may drop or be removed from the opening during operation
Solution Approach 1:
The aperture plate undergoes preliminary plastic deformation to expand its outer circumference before insertion, creating an interference fit that secures the plate in position without requiring additional fastening mechanisms
Solution Approach 2:
The physical state of the aperture plate is changed through plastic deformation, permanently altering its dimensional parameters (outer circumference) to create a secure interference fit with the cylindrical portion
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
This design prevents the formation of fine metal powder, ensuring high reliability and preventing compressor failure by maintaining the aperture plate's secure position, thus ensuring stable lubrication and operation of the compressor.
Implementation Method 1
Oil-feeding pipe 12 having the tip end opening to lubricating oil 4 rotates to generate a pressure in oil-feeding pipe 12 by centrifugal pump effects. This pressure causes lubricating oil 4 to be sucked to oil-feeding pipe 12
Implementation Method 2
an aperture plate having a suction aperture formed therein. The aperture plate has an inner edge facing the suction aperture, and an outer edge of the aperture plate contacting an inner surface of the cylindrical portion. A portion of the aperture plate between the inner edge and the outer edge of the aperture plate is positioned more outward from the cylindrical portion than the inner edge and the outer edge are
Data Source
AI summary
A hermetic compressor includes a hermetic container arranged to store lubricating oil, a motor element accommodated in the hermetic container, an oil-feeding mechanism arranged to carry the lubricating oil, and a centrifugal pump arranged to carry the lubricating oil to the oil-feeding mechanism. The centrifugal pump includes a cylindrical portion having a hollow opening at the opening, and an aperture plate having a suction aperture formed therein. The aperture plate has an inner edge facing the suction aperture, and an outer edge of the aperture plate contacting an inner surface of the cylindrical portion. A portion of the aperture plate between the inner edge and the outer edge of the aperture plate is positioned more outward from the cylindrical portion than the inner edge and the outer edge are. This hermetic compressor does not produce fine metal powder during manufactured, having high reliability.