Axially Movable Insert for Vane Cell Machine Wear Reduction
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Solution Overview
Problem
Vane cell machines in reverse osmosis systems face challenges in maintaining internal tightness while minimizing wear between the rotor and side wall, as excessive force leads to friction and leakage, which reduces efficiency and increases wear.
Innovation Solution
The introduction of an axially movable insert in the side wall with pressure application surfaces inside and outside, allowing for hydraulic balance and reduced wear by dividing the side wall into two elements, with a sealing ring to prevent fluid leakage and an eccentric bore for rotor support, ensuring the vanes rest on a friction-reducing material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the rotor and side wall bear on each other with large force to reduce internal leakage, then internal tightness is improved, but friction and wear between rotor and side wall increase
Solution Approach 1:
The side wall is segmented into a stationary outer side wall and a movable insert, allowing the insert to move axially in response to pressure differences while the outer side wall remains fixed. This segmentation enables the system to achieve both tightness and reduced wear by allowing controlled movement of the insert against the rotor.
Solution Approach 2:
The insert is made axially movable rather than fixed, allowing it to dynamically adjust its position based on pressure conditions. The insert can move closer to or farther from the rotor surface, enabling the system to maintain optimal contact force for tightness while reducing friction and wear through controlled movement.
2Duration of action of stationary object
If the rotor and side wall bear on each other with small force to reduce friction and wear, then service life is improved, but internal leakage increases
Solution Approach 1:
The axial movement of the insert is driven by hydraulic pressure differences acting on pressure application surfaces with different areas. The pressure differential creates axial forces that move the insert toward or away from the rotor, automatically adjusting the contact force to maintain tightness while minimizing wear, without requiring external mechanical actuation.
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
Achieves satisfactory internal tightness and minimizes wear by optimizing the force distribution between the rotor and side wall, preventing leakage and reducing frictional contact to steel, thus enhancing the operational efficiency and longevity of the vane cell machine.
Implementation Method 1
When the pressure application surfaces and the pressures acting upon them are adapted to each other accordingly, a hydraulic balance can be achieved, so that the insert and the rotor bear on each other with a force that is chosen so that on the one hand a satisfactory tightness is achieved and on the other hand the wear can be kept small.
Implementation Method 2
a sealing ring is arranged between the stator and the insert. This sealing ring, for example an O-ring, seals the insert towards the outside.
Data Source
AI summary
The invention concerns a vane cell machine with a stator and a rotor having radially displaceable vanes arranged in guides, said vanes bearing on an inside of the stator and bordering, together with the rotor, the stator and a side wall, work chambers at each axial end of the rotor. It is endeavored to provide a vane cell machine that has a good internal tightness, in which the wear is still kept small. For this purpose, in a radially internal area the side wall comprises an insert that is axially movable in the side wall and has a pressure application surface axially inside and axially outside.