Deformable Double-Headed Piston for Swash Plate Compressor Jamming
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Solution Overview
Problem
The double-headed piston type swash plate compressor experiences jamming issues due to misalignment between the piston and cylinder bores, leading to fluid leakage and efficiency losses when gaps are widened to prevent jamming.
Innovation Solution
The design includes a double-headed piston with deformable coupling portions and a neck that can deform in the radial and widthwise directions, aligning the piston with the cylinder bores to prevent jamming while minimizing gap size and fluid leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sufficient gap is formed between the head of the double-headed piston and the wall surfaces of the cylinder bores to prevent jamming, then jamming is prevented, but fluid easily leaks from the compression chambers and loss increases
Solution Approach 1:
The coupling portions are designed to be deformable in the widthwise direction, allowing the piston to dynamically adjust its position and shape during operation. This dynamic adaptability enables the piston to accommodate misalignment between cylinder bores without requiring excessive gaps, thereby preventing jamming while minimizing fluid leakage.
Solution Approach 2:
The invention changes the physical state of the coupling portions from rigid to deformable. By allowing the coupling portions to deform elastically in the widthwise direction, the piston can adapt to misalignment conditions, maintaining reliable operation without the need for enlarged gaps that would cause fluid leakage.
2Reliability
If the gap between the double-headed piston and cylinder bores is widened to accommodate misalignment, then jamming is prevented, but compressor efficiency decreases due to increased fluid leakage
Solution Approach 1:
The deformable coupling portions enable the piston to dynamically adapt to misalignment during operation, maintaining close clearance without jamming. This dynamic adjustment preserves compressor efficiency by minimizing the gap size while ensuring reliable operation under misaligned conditions.
Solution Approach 2:
By changing the coupling portions from rigid to deformable, the system can maintain smaller gap dimensions while accommodating misalignment. This parameter change preserves compressor efficiency by reducing fluid leakage paths while ensuring operational reliability.
3Ease of manufacture
If rigid coupling portions are used to maintain structural integrity, then manufacturing is simpler, but jamming occurs more easily due to inability to accommodate misalignment
Solution Approach 1:
The coupling portions are designed with deformability in the widthwise direction, allowing them to adapt to misalignment during operation. This dynamic characteristic enhances reliability by preventing jamming while maintaining relatively simple manufacturing processes.
Solution Approach 2:
The invention introduces deformability as a key parameter of the coupling portions. This parameter change enables the structure to accommodate misalignment without requiring complex manufacturing, balancing ease of manufacture with improved reliability.
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 solution allows the double-headed piston to reciprocate smoothly in misaligned cylinder bores, reducing jamming and fluid leakage, and maintaining compressor efficiency without the need for enlarged gaps, thus enhancing operational reliability and reducing wear.
Implementation Method 1
The neck is larger in the widthwise direction than in the opposing direction so that the neck is deformable in the opposing direction when the swash plate applies load to the double-headed piston. Each of the two coupling portions has a width that is less than or equal to a width of the neck. The inner portion includes a narrow portion having a width that is less than or equal to a width of each of the shoe holders. The narrow portion is at least partially located closer to the head than the shoe holder in the inner portion. The two coupling portions are deformable in the widthwise direction when the swash plate applies load to the double-headed piston.
Data Source
AI summary
A double-headed piston type swash plate compressor includes a rotation shaft, a housing, a swash plate, two cylinder bores, a double-headed piston, and two shoes. The double-headed piston includes two shoe holders, a neck, two heads, and two coupling portions. Each of the coupling portions includes an outer portion and an inner portion. A direction orthogonal to both of an opposing direction of the inner portion and the outer portion and the axial direction of the double-headed piston is referred to as a widthwise direction. The neck is larger in the widthwise direction than in the opposing direction so that the neck is deformable in the opposing direction. Each of the two coupling portions has a width that is less than or equal to a width of the neck. The inner portion includes a narrow portion. The narrow portion is at least partially located closer to the head than the shoe holder in the inner portion. The two coupling portions are deformable in the widthwise direction when the swash plate applies load to the double-headed piston.