Plastic Double Piston Pump for Weight Reduction
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Solution Overview
Problem
Conventional piston pump devices with double pistons are heavy and large due to their steel or dimensionally stable metal construction, making them unsuitable for mobile applications where weight and space savings are essential.
Innovation Solution
The piston pump device uses plastic materials for the double piston and/or second housing part, specifically unreinforced plastics like polyamide or fiberglass-reinforced plastics, to reduce weight while maintaining stability, and incorporates a stabilizing sleeve and annular space to manage high pressures, along with a pot-shaped design and ventilation system for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If steel or dimensionally stable metal is used for the piston pump device, then high pressure resistance is achieved, but weight and size increase significantly
Solution Approach 1:
The patent employs composite material construction by combining plastic components (piston, second housing part) with metal stabilizing elements. This allows the main body to be lightweight plastic while metal reinforcement provides the necessary pressure resistance, resolving the contradiction between weight reduction and pressure capability.
Solution Approach 2:
Instead of making the entire device from heavy metal, the patent applies metal stabilizing sleeves and reinforcement elements only in specific high-stress areas where pressure resistance is critical. The majority of the device uses lightweight plastic, achieving local optimization of strength-to-weight ratio.
2Stability of the object's composition
If steel or dimensionally stable metal is used for the piston pump device, then structural stability is maintained, but space requirements increase
Solution Approach 1:
The combination of plastic and metal stabilizing elements creates a composite structure that achieves structural stability without the bulk required by solid metal construction. The plastic components provide the basic structural framework while metal reinforcements add stability only where needed, reducing overall device volume.
Solution Approach 2:
The device is segmented into plastic components and metal stabilizing elements that can be separately optimized. The plastic parts provide the main structure with minimal volume, while discrete metal elements add stability only in critical zones, avoiding the need for throughout metal construction that would increase volume.
3Weight of moving object
If unreinforced plastic is used for the piston and housing parts, then weight is reduced, but pressure withstanding capability decreases
Solution Approach 1:
Unreinforced plastic components are combined with metal stabilizing sleeves and reinforcement elements. The plastic provides lightweight construction while the metal elements provide the necessary pressure withstanding capability, allowing the use of unreinforced plastic without sacrificing pressure resistance.
Solution Approach 2:
Metal stabilizing sleeves act as intermediary elements between the unreinforced plastic components and the high-pressure environment. These sleeves transfer and distribute pressure loads, protecting the plastic components from direct pressure exposure while maintaining the lightweight plastic construction.
4Stability of the object's composition
If reinforced plastic is used for the housing, then dimensional stability improves, but sealing surface quality deteriorates
Solution Approach 1:
The housing is constructed with differentiated local qualities: reinforced plastic is used for sections requiring dimensional stability and pressure resistance, while unreinforced or differently finished plastic sections provide smooth sealing surfaces. This local differentiation allows both dimensional stability and sealing quality to be optimized in their respective areas.
Solution Approach 2:
The housing combines reinforced plastic sections with smooth-finish sections, potentially using different plastic compositions or surface treatments in different areas. This composite construction allows the housing to provide both dimensional stability from the reinforced sections and high-quality sealing surfaces from the smooth sections.
Data Source
Figure 1~2
Figure 3~5
AI summary
The present invention relates to a piston pump device (1), in particular for a lubricant pump, with a double piston (8) comprising a working piston (8a) and a delivery piston (8b) connected to each other via a piston rod (20), wherein the working piston (8a) is arranged sealingly in a first housing part (10; 12) and the delivery piston (8b) is arranged sealingly in a second housing part (10; 12), such that the working piston (8a) and the first housing part (10; 12) define a working chamber (16) for a working medium and the delivery piston (8b) and the second housing part (10; 12) define a delivery chamber (34) for a delivery medium, wherein the double piston (8) and/or the first and/or the second housing part (10; 12) are made of plastic, and a lubricant pump (100) with such a piston pump device (1).