Plastic Pump Assembly With Segmented Sealing for Easier Recycling
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Solution Overview
Problem
Existing pump assemblies require complex manufacturing processes due to the need for precise slidable sealing contact between the piston portion and the pump housing, making them difficult to recycle.
Innovation Solution
A pump assembly design featuring a pressing rod assembly with mating portions that allow for slidable sealing contact between the piston member and the housing, enabling assembly into an integral piece, reducing manufacturing complexity and facilitating recycling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the piston portion and piston body are both required to be in slidable sealing contact with the inner cavity of the pump housing, then the sealing performance is improved, but the manufacturing process becomes difficult
Solution Approach 1:
The pressing rod assembly is divided into separate components: the pressing rod body with first and second mating portions, the inner sleeve member with a fourth mating portion, and the piston member with a third mating portion. These segmented parts are assembled together to achieve the required sealing contact without requiring complex monolithic structures, thus improving manufacturability while maintaining sealing performance.
Solution Approach 2:
The inner sleeve member acts as an intermediary component between the pressing rod body and the piston member. It transmits the pressing force while maintaining sealing contact with the housing through the mating portions, simplifying the manufacturing process by distributing the sealing requirements across multiple simpler components rather than requiring complex integrated sealing structures.
2Ease of repair
If the pump assembly is designed to be easily recycled by making it entirely of plastic, then the recyclability is improved, but the manufacturing precision required for slidable sealing contact becomes more difficult to achieve
Solution Approach 1:
The pressing rod assembly is segmented into multiple plastic components (pressing rod body, inner sleeve member, piston member) that can be separately manufactured and then assembled. This segmentation allows each component to be manufactured with standard plastic molding precision, avoiding the need for extremely high precision in a single complex component, while still achieving the required sealing performance through the assembled mating portions.
Solution Approach 2:
The design uses multiple mating portions (first, second, third, and fourth mating portions) spaced at specific distances along the axial direction. By changing the geometric parameters and spacing of these mating portions, the assembly achieves reliable sealing contact through cumulative effect rather than requiring extreme precision in any single interface, making plastic manufacturing feasible.
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
The assembly method simplifies manufacturing by ensuring slidable sealing contact without the need for additional components, making the pump assembly easier to produce and recycle.
Implementation Method 1
the piston member has a piston portion at one end and a third mating portion at the other end, and can be mounted on an outer periphery of the inner sleeve member in a sleeving manner. In an assembled state, the piston portion is located in the annular chamber and is in slidable sealing contact with both an outer wall surface of the inner cylinder wall and an inner wall surface of the outer cylinder wall
Data Source
Figure 1
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Figure 4
AI summary
A container and a pump assembly thereof. The pump assembly (1) comprises a main housing (10), a built-in member (11), and a pressing rod assembly (12), wherein the pressing rod assembly includes a pressing rod body (120), an inner sleeve member (121), and a piston member (122), and in an assembled state, the movement of the inner sleeve member and the piston member in an axial direction of the pressing rod body is limited, and at the same time, a first mating portion (1201) of the pressing rod body is in slidable sealing contact with at least one part of the interior of the main housing. The pump assembly having this configuration is easy to manufacture while being ensured to be easily recycled.