Centrifugal Separator Piston Assembly Pneumatic Solids Discharge
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Solution Overview
Problem
Conventional centrifugal separators face challenges with sticky solids, sensitive materials, and high shear forces, leading to poor yields, contamination, and maintenance issues, particularly in pharmaceutical processes.
Innovation Solution
A centrifugal separator design featuring a cylindrical bowl with a conical lower end and a piston assembly that allows for low-shear acceleration and pneumatic/hydraulic solids discharge without external mechanical equipment, enabling operator-independent operation and in-place cleaning/sterilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional separators use high-speed rotation to separate solids, then separation efficiency is improved, but shear forces damage sensitive materials
Solution Approach 1:
The patent applies preliminary action by allowing feed material to accelerate gradually along the conical surface before reaching the high-speed rotation zone. The conical geometry provides a transition path that increases rotational speed progressively, reducing sudden shear forces on sensitive materials while still achieving effective separation.
Solution Approach 2:
The conical lower end changes the geometric parameter of the bowl from cylindrical to conical, which fundamentally alters the flow dynamics and acceleration profile of the feed material. This parameter change enables gradual acceleration and reduces harmful shear forces while maintaining separation efficiency.
2Productivity
If conventional separators use internal scrapers to discharge solids, then solids removal is improved, but contamination risk increases
Solution Approach 1:
The patent extracts the scraper mechanism from the internal environment and replaces it with an external pneumatic discharge system. Compressed gas is introduced through ports in the bowl wall to fluidize and discharge solids externally, eliminating the need for internal mechanical scrapers that pose contamination risks.
Solution Approach 2:
The patent replaces the mechanical scraper system with a pneumatic system. Instead of using mechanical contact to discharge solids, compressed gas is used to fluidize and propel solids through discharge ports, substituting mechanical action with pneumatic action to eliminate contamination sources.
3Adaptability or versatility
If conventional separators use numerous mechanical components for solids recovery, then solids handling capability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The patent applies pneumatics by using compressed gas introduced through ports in the bowl wall to discharge accumulated solids. The pneumatic system replaces complex mechanical discharge mechanisms with a simpler gas-pressure-based system that reduces the number of moving parts and maintenance requirements.
Solution Approach 2:
The conical bowl geometry enables self-discharge of solids through gravity and centrifugal force without requiring additional mechanical assistance. The design allows solids to accumulate and then discharge automatically based on the conical surface angle, reducing the need for external discharge mechanisms.
4Ease of operation
If conventional separators require operator intervention for solids discharge, then flexibility in handling is improved, but contamination risk and operational complexity increase
Solution Approach 1:
The separator is designed to automatically discharge solids through the conical bowl geometry and pneumatic system without requiring operator intervention. The system self-regulates the discharge process based on accumulated solids, eliminating the need for manual operation and associated contamination risks.
Solution Approach 2:
The patent replaces manual mechanical operations with an automated pneumatic discharge system. Compressed gas is used to automatically fluidize and discharge solids, substituting operator intervention with an automated pneumatic mechanism that reduces contamination risk.
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 separator effectively handles sticky and sensitive solids with reduced shear forces, minimizing contamination and maintenance costs, while ensuring efficient recovery and easy cleaning/sterilization.
Implementation Method 1
The rotating bowl spins at high speeds and forces components of the mixture that have a high specific gravity to separate therefrom by sedimentation. As a result, dense solids compress as a cake tightly against an inner surface or wall of the bowl
Implementation Method 2
fluid such as compressed gas or hydraulic liquid acts against the upper portion of the piston urging it axially downward to force accumulated solids from the bowl
Implementation Method 3
an exemplary hydraulic liquid for moving the piston in the bowl can include distilled water
Data Source
AI summary
A centrifugal separator includes a cylindrical bowl having a conical lower end with an opening through which feed liquid is injected during a feed mode of operation. During the feed mode, solids separate from the feed liquid and accumulate along the inner surface of the bowl as the bowl rotates at high speed. After accumulation of the solids, the rotation of the bowl is stopped and residual liquid is drained by gravity from the bowl. In a solids discharge mode of operation, a piston of a piston assembly is urged downward along a vertical axis in response to fluid such as compressed gas or hydraulic liquid. The downward movement of the piston forces accumulated solids from the bowl via the opening in the conical lower end thereof. The solids pass from the bowl and into a passage leading to an outlet port, where the solids exit the separator.