Compressor Shell Offset Mounting Pins Oil Pocket
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Solution Overview
Problem
In refrigerant compressors, the risk of lubricant interruption and increased wear occurs when the compressor shell is not mounted completely horizontal, leading to malfunctions due to the oil pickup not immersing in the lubricant sump, and there is a need for a design that reduces the overall size of the compressor shell while ensuring proper lubrication.
Innovation Solution
The compressor shell design features offset mounting pins and a convexly curved bottom wall forming an oil pocket, ensuring the oil sump accumulates at the lowest point, even when the compressor is inclined, and includes support areas for mounting pins and integrated dampening elements to absorb movements and vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compressor shell is designed with a flat bottom wall and symmetric mounting pin arrangement, then the manufacturing is simple and the structure is stable, but the oil pickup cannot reliably immerse in the lubricant sump when the compressor is mounted on an inclined surface
Solution Approach 1:
The patent applies asymmetry by offsetting the mounting pins from the geometric center of the compressor shell. The mounting pins are positioned at specific coordinates that create an asymmetric arrangement, which shifts the oil sump formation location relative to the pump unit. This asymmetric design ensures that the oil pickup remains immersed in the oil sump even when the compressor is mounted on an inclined surface, thereby maintaining reliable lubrication without requiring a complex curved bottom wall structure.
Solution Approach 2:
The patent applies local quality by creating a specific geometric relationship between the mounting pin positions and the bottom wall structure. The mounting pins are positioned at optimized locations that locally affect the oil distribution pattern, ensuring proper lubrication at the critical oil pickup location while maintaining a simple overall shell structure. This localized optimization allows the system to achieve reliable lubrication without global structural complexity.
2Reliability
If the mounting pins are arranged symmetrically at the center of the compressor shell, then the structural stability is maximized, but the oil sump formation location cannot be controlled to ensure proper lubrication
Solution Approach 1:
The patent deliberately introduces asymmetry in the mounting pin arrangement to control the oil sump formation location. The mounting pins are positioned at asymmetric coordinates relative to the shell center, which creates a predictable oil distribution pattern that ensures the oil pickup remains immersed in the oil sump during operation and transportation, while maintaining adequate structural stability.
Solution Approach 2:
The patent applies parameter changes by optimizing the positional parameters of the mounting pins. Specific coordinates and spacing dimensions are defined for the mounting pins to achieve the desired oil sump formation characteristics. By carefully selecting these geometric parameters, the system ensures proper lubrication while maintaining structural integrity and stability.
3Reliability
If the compressor shell is designed with a larger size to accommodate proper oil sump formation, then the lubrication is ensured, but the overall device size increases and space efficiency decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the geometric parameters of the mounting pin arrangement to control oil sump formation. By adjusting the position, spacing, and configuration parameters of the mounting pins, the system achieves reliable lubrication with a compact shell design, avoiding the need for excessive shell volume while ensuring proper oil distribution and pickup immersion.
Solution Approach 2:
The patent applies local quality by focusing the oil sump formation control at the critical lubrication zone near the oil pickup. The mounting pins are positioned to create optimal oil distribution locally at the pump unit location, ensuring reliable lubrication without requiring the entire shell volume to be increased. This localized optimization maintains compact overall dimensions while ensuring proper lubrication.
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 ensures consistent lubrication and reduced size, preventing malfunctions and wear by maintaining the oil pickup's submersion in the oil sump and allowing for efficient lubrication, even when the compressor is not mounted perfectly horizontal, while also reducing the overall size and enhancing stability.
Implementation Method 1
A curved section of the bottom wall is convexly curved in order to form an oil pocket, wherein a lowest point of the oil pocket, seen in the height direction, is aligned with the first centre point in the horizontal plane
Data Source
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AI summary
The invention relates to a compressor shell for a refrigerant compressor; wherein the compressor shell encloses an inner containing space (130) for housing a pump unit of the refrigerant compressor; wherein four mounting pins (140) are extending from the bottom wall (111) into the containing space (130), wherein each mounting pin (140) is configured to mount a support spring assembly for supporting the pump unit, wherein the four mounting pins (140) are arranged in a rectangular shape. In order to improve the compressor shell (100) design with regard to the formation of an oil pocket (104) in which an oil sump forms during operation so as to reduce the probability of malfunction of the lubricant conveying system it is provided according to the invention that a first centre point (C1) of the four mounting pins (140) is offset in the length direction (x) with regard to a second centre point (C2) of an outline of the compressor shell (100) and that a curved section (111a) of a bottom wall (111) of a lower shell part (110) is convexly curved in order to form an oil pocket (104), wherein a lowest point of the oil pocket (104), seen in the height direction (z), is aligned with the first centre point (C1).