Plastic Pump Assembly Gas-Rebound Mechanism for Recyclability
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Solution Overview
Problem
Existing pump assemblies with contents discharge functions are difficult to recycle due to the integration of metal springs with plastic components, as recycling standards require separate recycling of plastic and metal materials, and the springs are tightly mounted, making disassembly challenging.
Innovation Solution
A pump assembly design that uses a piston and gas cavities to facilitate rebounding without the need for a spring, allowing the entire assembly to be made of plastic and easily recycled, as the piston portion rebounds under the action of gas pressure in sealed and communication cavities to drive the rod body to re-press, eliminating the need for a spring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal spring is used inside the pump main body to enable rebounding, then the rebounding function is achieved, but the recyclability of the pump assembly deteriorates due to the integration of metal and plastic materials
Solution Approach 1:
The invention extracts and removes the metal spring from the pump assembly, replacing it with a gas-based rebounding mechanism. The pump main body is divided into a first gas cavity (sealed) and a second gas cavity (communicating with the outside), where gas pressure differential provides the rebounding force without requiring any metal components, thus achieving full plastic construction for easy recycling.
Solution Approach 2:
The invention uses gas pressure differential between a sealed first gas cavity and an open second gas cavity to create the rebounding force. When the press rod is pressed down, the gas in the first cavity is compressed and the gas in the second cavity expands, creating a pressure differential that drives the rebounding motion, replacing the traditional mechanical spring with a pneumatic-hydraulic mechanism.
2Device complexity
If a metal spring is tightly mounted inside the pump main body, then the compact structure is achieved, but the disassembly difficulty increases making recycling challenging
Solution Approach 1:
The invention removes the metal spring entirely from the assembly, eliminating the need to disassemble or separate metal components from plastic housing. The gas cavity structure is integrated into the pump main body design, allowing the entire assembly to be made of plastic and easily separated for recycling without complex disassembly procedures.
3Ease of manufacture
If plastic materials are used for the entire pump assembly, then the recyclability is improved, but the rebounding mechanism becomes more complex requiring gas cavities
Solution Approach 1:
The invention merges the rebounding mechanism with the pump main body structure itself. The first and second gas cavities are integrated into the housing design, with the piston portion forming part of the internal structure. This integration eliminates the need for separate rebounding components while maintaining the plastic-only construction for recyclability.
Solution Approach 2:
The invention uses a gas-based mechanism where the sealed first gas cavity and open second gas cavity create pressure differential for rebounding. This pneumatic-hydraulic approach replaces complex mechanical spring assemblies with a simpler gas pressure-based system that can be fully plastic and easily recyclable.
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 solution enables the pump assembly to be entirely made of plastic, facilitating easy recycling and improving user experience by eliminating the need for metal components and enhancing the rebounding mechanism for smoother operation.
Implementation Method 1
the piston portion is configured to rebound under the action of the resultant force of a gas pressure in the first gas cavity and a gas pressure in the second gas cavity
Data Source
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AI summary
The present invention aims to provide a pump assembly and a container with a contents discharge function. The pump assembly is adapted to be mounted on a container body, and comprises a pump main body and a press rod, wherein the press rod has a rod body and a piston portion; the pump main body has a first cavity; the rod body is slidably provided in the first cavity in a penetrating manner, and one end thereof extends out of the first cavity; and the piston portion is connected to the rod body and is located in the first cavity so as to divide the first cavity into a first gas cavity and a second gas cavity, wherein the first gas cavity and/or the second gas cavity are sealed cavities. Since the piston portion can rebound under the action of the resultant force of a gas pressure in the first gas cavity and a gas pressure in the second gas cavity, so as to drive the rod body to rebound, the pump main body does not need to be provided with a spring for rebounding the rod body. As a result, the pump assembly can be entirely made of a plastic material, and no metal material is mixed, so that the pump assembly is easily recycled. The container with a contents discharge function comprises the pump assembly described above.