Corrosive Fluid Pump With Conductive Plastic Sealing
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Solution Overview
Problem
Pumps used in industrial processes for corrosive and potentially explosive fluids face challenges in resisting corrosion and preventing explosions due to static electricity buildup, as existing materials are not adequately resistant or conductive to manage these risks effectively.
Innovation Solution
The development of pumps with components made from conductive plastics, non-conducting plastics with conducting particles, semi-conducting ceramics, and their combinations, such as PTFE with carbon particles or silicon carbide, which form a sealed internal chamber to prevent leakage and static electricity discharge, using magnetic couplings and specific couplings like polygonal and pre-stressed couplings to ensure safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional non-conductive plastic materials are used for pump components exposed to corrosive fluids, then corrosion resistance is improved, but static electricity buildup occurs leading to explosion risk
Solution Approach 1:
The patent changes the electrical conductivity parameter of the plastic material from non-conductive to conductive by adding carbon particles or other conductive fillers. This transforms the material's electrical properties while maintaining its chemical corrosion resistance, thereby resolving the contradiction between corrosion protection and static electricity prevention.
Solution Approach 2:
The patent uses composite materials consisting of plastic matrix combined with conductive particles (such as carbon particles, graphite, or metal powders). This composite structure combines the chemical inertness and corrosion resistance of plastics with the electrical conductivity of the added particles, simultaneously addressing both requirements.
2Object-generated harmful factors
If conductive materials are used to prevent static electricity buildup, then explosion risk is reduced, but corrosion resistance to aggressive chemicals deteriorates
Solution Approach 1:
The patent employs composite materials where a corrosion-resistant plastic matrix (such as PTFE, polypropylene, or PVDF) is combined with conductive particles. The plastic matrix provides chemical inertness and corrosion resistance, while the dispersed conductive particles provide electrical conductivity for static electricity dissipation, achieving both properties simultaneously.
Solution Approach 2:
The conductive properties are introduced locally through particle distribution within the plastic matrix rather than using fully conductive materials. This allows the bulk material to maintain its corrosion-resistant plastic properties while specific regions (where conductive particles are present) provide the necessary electrical conductivity.
3Reliability
If magnetic coupling systems are implemented to drive the pump, then sealing and explosion prevention are improved, but device complexity increases
Solution Approach 1:
The patent replaces direct mechanical coupling (which would require shaft seals and penetrations) with magnetic coupling. The magnetic field transmits rotational force across the sealed barrier without physical contact, eliminating the need for shaft seals and maintaining complete sealing integrity while reducing explosion risk.
Solution Approach 2:
The magnetic field acts as an intermediary to transmit mechanical energy from the driver to the pump impeller without direct physical connection. This allows power transmission while maintaining the integrity of the sealed chamber, as the magnetic field can penetrate non-magnetic materials (such as the pump housing) without creating seal openings.
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 provides enhanced resistance to corrosive fluids and significantly reduces the risk of explosions by effectively managing static electricity, ensuring a safer and longer service life for pumps in corrosive and explosive environments.
Implementation Method 1
The drive shaft is configured for magnetically coupling to an external motor
Implementation Method 2
manufacturing components of the pump exposed to the corrosive fluid from a conductive plastic, a non-conducting plastic with conducting particles, a semi-conducting ceramic
Data Source
AI summary
The pump includes a pumping chamber within a sealed internal chamber, a pump inlet connected to the pumping chamber, a pump outlet connected to the pumping chamber, and a rotational pumping element configured to pump the corrosive fluid from the pump inlet to the pump outlet. The rotational pumping element is within the pumping chamber. The pump includes a drive shaft for driving the rotational pumping element. The drive shaft is completely within the sealed internal chamber. The drive shaft is configured for magnetically coupling to an external motor. A pump housing forms the sealed internal chamber. The rotational element, the pumping chamber, and the pump housing are formed from any one a conductive plastic, a non-conducting plastic with conducting particles, a semi-conducing ceramic, and combinations thereof. The drive shaft is formed from the semi-conducting ceramic.