Dead Space Alignment Sleeve for Crankcase Venting and Wear Control
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Solution Overview
Problem
Internal combustion engines face alignment issues and increased friction due to sideways forces, and the 'dead space' between compression and crosshead cylinders leads to unwanted heat and load pulsations, especially when compressing natural gas at high pressures.
Innovation Solution
The introduction of alignment sleeves with apertures between the compression and crosshead cylinders, which create a sealed flow passage to vent air and prevent gas mixing, ensuring alignment and reducing friction by allowing controlled ventilation and leakage detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If drilling flow passages into the crosshead piston or designing it open to the crankcase, then the trapped air can pass freely from the dead space to the crankcase, but oil mist and spray will enter the compression cylinder and gas will leak directly into the crankcase if seals fail
Solution Approach 1:
The patent introduces a dead space alignment sleeve as an intermediary component between the compression piston and crosshead piston. This sleeve provides a controlled pathway for venting trapped air from the dead space while maintaining seal integrity. The sleeve includes apertures that allow communication between dead space and crankcase, eliminating the need for flow passages in the crosshead piston or open design, thereby preventing oil mist entry and gas leakage while still relieving pressure buildup.
Solution Approach 2:
The invention segments the dead space ventilation function from the piston structure itself by introducing a separate alignment sleeve component. This segmentation allows the ventilation function to be independent of the seal integrity concerns, as the sleeve provides a dedicated, controlled pathway that does not compromise the sealing surfaces of the pistons.
2Ease of manufacture
If no alignment structure is provided, then the structure is simpler, but sideways forces cause intolerable wear on the compression piston and cylinder and increase friction
Solution Approach 1:
The dead space alignment sleeve serves multiple functions simultaneously: it provides compression cylinder alignment to prevent sideways forces and wear, vents trapped air from the dead space to eliminate pressure buildup, and maintains seal integrity. By combining these functions in a single component, the invention achieves proper alignment without significantly increasing structural complexity.
3Device complexity
If the compression cylinder is not aligned, then the structure is simpler, but friction and wear increase significantly
Solution Approach 1:
The alignment sleeve acts as a mediator that provides precise alignment between the compression cylinder and piston while maintaining overall structural simplicity. The sleeve's apertures and locating features enable proper alignment without requiring complex alignment mechanisms, thereby reducing friction and wear while minimizing added complexity.
Data Source
AI summary
A cylinder aligning sleeve and adapter plate for use within an internal combustion engine. The sleeve includes apertures placed contiguously with holes within the adapter plate to form a flow passage through the dead space between compression and crosshead pistons. The flow passage exits to a vent line where gas detection may occur along with safe venting of any gas detected. The sleeve serves to ensure concentric alignment of the compression cylinder with the engine block bore.