Centrifugal separator
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Solution Overview
Problem
Conventional centrifugal separators, such as spin dryers, experience undesired vibrations and noise during operation, leading to uneven wear on parts and potential safety concerns.
Innovation Solution
A centrifugal separator design featuring a stationary chamber with a spinning basket, a flexible driveshaft, an electronically operated caliper brake, and a controller that adjusts speed and direction to minimize vibrations and noise, along with additional features like a balance ring, moisture sensor, and ultraviolet light for enhanced operation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional centrifugal separator is used, then the basic separation function is achieved, but vibrations and noise occur during operation
Solution Approach 1:
A balance ring is mounted on the exterior surface of the basket to rotate therewith, providing counterbalancing weight to offset vibrations generated during spin drying operation
Solution Approach 2:
A flexible coupling is provided between the motor output shaft and the driveshaft, acting as an intermediary element that reduces vibration transmission while maintaining power transmission
2Productivity
If high spinning speed is used for efficient water removal, then productivity increases, but vibrations and noise increase
Solution Approach 1:
The balance ring rotates with the basket at high speeds, providing dynamic counterbalancing that enables high-speed operation while minimizing vibrations and noise
Solution Approach 2:
The controller ramps up the speed of the basket during starting and ramp down the speed during stopping, and can vary spinning speed through regions of increased vibration to optimize performance while controlling harmful effects
3Strength
If rigid mechanical connections are used for power transmission, then structural strength is maintained, but uneven wear on interconnected parts occurs
Solution Approach 1:
A flexible coupling is provided between the motor output shaft and the driveshaft, allowing for accommodiation of misalignment and uneven wear while maintaining structural integrity
Solution Approach 2:
The flexible coupling introduces dynamic flexibility to the rigid power transmission system, allowing for movement and adjustment that prevents uneven wear on interconnected parts
4Reliability
If a simple brake system is used, then device complexity is reduced, but safety and control precision are compromised
Solution Approach 1:
An electronically operated caliper brake is provided, replacing simple mechanical braking with an electronically controlled system that offers improved safety and control precision
Solution Approach 2:
The controller manages the electronically operated caliper brake, providing feedback control for precise stopping and safety management during spin drying operation
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 design significantly reduces vibrations and noise, provides smoother operation, and enhances safety with automatic power shut-off and braking, while allowing for larger capacity and easier maintenance, resulting in a more efficient and user-friendly spin drying process.
Implementation Method 1
A balance ring having an annular chamber holding a balance fluid, is mounted to an outside of the basket to rotate therewith
Implementation Method 2
The caliper has brake shoes that are engagable to opposite faces of the brake disc
Implementation Method 3
A flexible coupling is provided between the motor output shaft and the driveshaft
Implementation Method 4
a centrifugal separator which uses centrifugal force to separate liquid from solids
Data Source
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AI summary
A centrifugal separator, such as a spin dryer that separates water from wet clothing includes a stationary chamber. A perforated basket is arranged to spin within the stationary chamber. A DC or AC motor is arranged below the bottom floor fastened to a mechanical floor. A driveshaft can be connected to the motor output shaft via a flexible coupling and passes through the bottom floor and is connected to the basket. A brake disc is operatively fixed to the output shaft, and a brake caliper is fixed to the mechanical floor to stop the brake disc. A balance ring, having an annular chamber holding a balance fluid, is mounted to an outside of the basket. The centrifugal separator can include a cycle controller that can ramp up or down the basket speed and reverse spinning direction of the basket.