Carbon-Coated Pressure Cover for Abrasion-Resistant Centrifugal Pumps
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Solution Overview
Problem
Centrifugal pumps face significant wear and tear due to abrasive media, leading to reduced functionality and short service life, especially when handling solids, and existing materials provide limited protection against wear and corrosion.
Innovation Solution
A centrifugal pump design featuring a pressure cover with a carbon layer, particularly a tetrahedral hydrogen-free amorphous carbon (ta-C) coating on contact surfaces, combined with a mechanical seal arrangement including an O-ring and counter ring, to enhance wear resistance and prevent damage to the shaft seal seat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If conventional materials (metal, rubber, plastic, enamel) are used for pump housing and pressure cover, then manufacturing costs are low and ease of manufacture is good, but wear resistance is insufficient and service life is reduced due to abrasion from solids-containing media
Solution Approach 1:
The patent applies a diamond-like carbon (DLC) coating layer on the pressure cover surface, creating a composite structure that combines the mechanical strength of metal with the exceptional wear resistance of carbon. This composite approach resolves the contradiction by providing both durability and abrasion resistance.
Solution Approach 2:
The patent changes the surface properties of the pressure cover by applying a DLC coating, which fundamentally alters the surface hardness and friction characteristics. This parameter change enables the surface to withstand abrasive wear from solids-containing media while maintaining the base material's structural integrity.
2Object-affected harmful factors
If wear-resistant coatings are applied to the pressure cover, then wear resistance improves and service life extends, but manufacturing complexity increases and manufacturing costs rise
Solution Approach 1:
The patent replaces complex mechanical wear protection systems with a thin-film DLC coating applied through vapor deposition processes. This substitution simplifies the overall manufacturing approach while providing superior wear resistance compared to traditional thick coatings or mechanical hardening methods.
Solution Approach 2:
The DLC coating process operates at relatively low temperatures and can be applied in a single step, changing the deposition parameters to achieve thin, uniform layers. This reduces manufacturing complexity compared to traditional high-temperature heat treatment or multi-layer coating systems.
3Stability of the object's composition
If the pressure cover is made from corrosion-resistant non-metallic materials, then corrosion resistance improves, but strength and wear resistance are limited
Solution Approach 1:
The patent creates a composite system where a metal pressure cover (providing strength) is coated with DLC (providing both corrosion and wear resistance). This composite approach overcomes the limitations of non-metallic materials by combining the advantages of different material classes.
Solution Approach 2:
The DLC coating modifies the surface chemistry and physical properties of the metal pressure cover, providing corrosion resistance comparable to non-metallic materials while retaining the underlying metal's mechanical strength and structural properties.
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 carbon layer significantly reduces abrasive wear, extends the service life of the pump, and maintains reliability while ensuring easy installation and low manufacturing costs, with the ta-C coating providing exceptional hardness and chemical resistance.
Implementation Method 1
The coating according to the invention protects the pressure cover component, particularly when pumping media containing solids, from abrasive action by the pumped medium
Implementation Method 2
The impeller shaft, which is provided with a shaft seal to prevent leakage, is guided into the pump interior by the pressure cover
Data Source
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AI summary
The invention relates to a centrifugal pump with a pump housing (10) and a pressure cover (7). One surface of the pressure cover (7) has at least a partial carbon layer.