Centrifugal Crankcase Purifier with Adaptive Flow Channel
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Solution Overview
Problem
Existing centrifugation devices for purifying gases from motor vehicle crankcases suffer from inefficiencies and pressure drops across a range of fluid flow rates, with fixed structures failing to optimize performance and adjustable designs facing issues like structural complexity and deformation.
Innovation Solution
A centrifugation device with a fixed cylindrical structure and a movable leaf spring that adjusts the fluid circulation channel section based on flow rate, using elastic means to change the channel's dimensions and maintain optimal fluid speed for efficient separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the body is fixedly mounted in the sleeve, then the device structure is simple, but the device cannot adapt to different flow rates and does not give complete satisfaction over the entire possible range of fluid flow rates
Solution Approach 1:
The body is made movable within the sleeve along the axial direction instead of being fixedly mounted. The body can translate axially to adjust the cross-sectional area of the fluid circulation zone, allowing the device to adapt to different flow rates while maintaining a relatively simple cylindrical structure
Solution Approach 2:
The cross-sectional area parameter of the fluid circulation zone is made variable by allowing the body to move axially. This parameter change enables the device to optimize performance across different flow rates without fundamentally changing the device structure
2Adaptability or versatility
If the body is made movable to adjust the circulation zone section, then the device can adapt to different flow rates, but the structural complexity increases and spring deformation occurs under gravity
Solution Approach 1:
The body is made movable within the sleeve along the axial direction instead of being fixedly mounted. The body can translate axially to adjust the cross-sectional area of the fluid circulation zone, allowing the device to adapt to different flow rates while maintaining a relatively simple cylindrical structure
Solution Approach 2:
The cross-sectional area parameter of the fluid circulation zone is made variable by allowing the body to move axially. This parameter change enables the device to optimize performance across different flow rates without fundamentally changing the device structure
3Stress or pressure
If the circulation zone section is increased to reduce pressure drops at high flow rate, then the pressure drops decrease, but the centrifugation efficiency decreases
Solution Approach 1:
The body position is made dynamically adjustable based on flow rate. At high flow rates, the body moves to increase the circulation zone area to reduce pressure drops; at low flow rates, the body returns to its original position to maintain high centrifugation efficiency
Solution Approach 2:
The cross-sectional area parameter of the fluid circulation zone is made variable by allowing the body to move axially. This parameter change enables the device to optimize performance across different flow rates without fundamentally changing the device structure
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 device achieves a balanced efficiency and pressure drop ratio, ensuring optimal performance across varying flow rates without manual adjustment, thereby enhancing the separation of gas and oil particles effectively.
Implementation Method 1
said member being urged by elastic means towards its rest position and being capable of being folded back against the structure, counter to the elastic means, by the passage of the fluid
Implementation Method 2
at least one helical projection formed on the outer face of the cylindrical portion and extending substantially as far as the inner face of the liner; a fluid circulation zone thus being defined along the helical projection between the body and the sleeve, to allow the centrifugation of the fluid
Data Source
Figure 1~4
Figure 2
Figure 5~7
AI summary
The device (1) has a body (3) fixedly mounted in a cylindrical housing (2), and comprising a cylindrical portion (10). A curved flap (19) is mounted in a fluid circulation zone, and forms a fluid circulation channel in the circulation zone when the flap occupies a rest position. The channel has a section larger than a section of the circulation zone. The flap is stressed by an elastically deformable spring plate (5) towards its rest position, and is adapted to be folded against the spring plate due to passage of the fluid such that the section of the channel is increased.