Composite Pressure Container Dome Shape for Stable Fiber Winding
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Solution Overview
Problem
Pressure containers face challenges in increasing capacity while minimizing occupancy space and preventing quality degradation due to unstable winding of fiber-reinforced resin materials, which can lead to local unevenness and reduced pressure resistance in the dome parts.
Innovation Solution
The design features a cylindrical straight body part with hemispherical dome parts that have a convex outer surface shape falling within specific elliptical ranges (ellipse A and ellipse B) and varying thicknesses, along with projection/recess portions to stabilize the winding of fiber-reinforced resin materials, ensuring a large capacity without enlarging occupancy space or degrading quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the height of the dome part is decreased to increase capacity while curbing occupancy space, then the capacity increases and occupancy space is reduced, but the fiber-reinforced resin material slips during winding and quality degradation occurs
Solution Approach 1:
The invention changes the geometric parameters of the dome part by defining specific curvature radius ratios (R1/R2 between 0.5-1.5) and height-to-diameter ratios (H/D between 0.2-0.4). These parameter optimizations ensure that the dome surface provides adequate winding stability for fiber-reinforced resin materials while maintaining reduced height for increased capacity
Solution Approach 2:
The invention applies curved surface geometry to the dome part with specifically controlled curvature radii. The first curvature radius R1 (in the direction toward the straight body part) and second curvature radius R2 (in the direction toward the equator) are optimized to create a surface that prevents material slip during winding while achieving compact height
2Volume of moving object
If the straight body part length is increased to increase capacity, then the capacity increases, but the occupancy space envelope becomes larger
Solution Approach 1:
The invention optimizes the dimensional distribution of the pressure container by reducing the dome height (vertical dimension) and compensating with increased straight body length (horizontal dimension). This dimensional redistribution increases internal capacity while maintaining a compact overall envelope suitable for vehicle installation
3Volume of moving object
If the dome part height is reduced to improve capacity density, then the capacity-to-space ratio improves, but local unevenness of outer shell thickness occurs
Solution Approach 1:
The invention optimizes the curvature radius parameters (R1 and R2) and their ratio (0.5-1.5) to ensure that the fiber-reinforced resin material distributes evenly during winding. This parameter optimization prevents local thickness unevenness while maintaining the reduced dome height for improved capacity density
Data Source
AI summary
The present invention can ensure a large capacity while curbing enlargement of occupancy space or quality degradation due to unstable winding of a fiber-reinforced resin material. A pressure container (1) is provided with: a container body (2); and a cylindrical straight body part (10) and a hemispherical dome part (12) which are formed of an outer shell (3) made of a fiber-reinforced resin material, wherein, in a cross-section of the dome part (12) taken along the central axis of the straight body part (10), the shape of the outer surface (21) of the dome part (12) of the container body (2) is a curved shape that falls within the range of ellipse A and ellipse B when the outside diameter of the straight body part (10) of the container body (2) is defined as 2a. The ellipse A is an ellipse that satisfies b/a=0.55, where the major axis thereof is defined as a straight line k connecting boundary points p between the straight body part (10) and the outer surface (21) of the dome part (12) of the container body (2), the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b. The ellipse B is an ellipse that satisfies b/a=0.70, where the major axis thereof is defined as the straight line k, the diameter along the major axis is defined as 2a, and the diameter along the minor axis is defined as 2b.