Rotary Fluid Machine Gate Curvature and Sealing
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Solution Overview
Problem
Rotary fluid machines face efficiency and reliability issues when handling fluids containing abrasive or corrosive substances, which can lead to wear and tear, and maintaining high-pressure operations is challenging due to fluid leakage and compatibility concerns.
Innovation Solution
The design incorporates a rotor and stator with specific geometries, including rounded corners and curved surfaces, along with a gate displacement system and sealing bands, to minimize contact and fluid leakage, while allowing for efficient fluid flow and high-pressure operation. The sealing system includes dynamic seals and radially extending channels to prevent fluid flow through slots and maintain a tolerance gap, enhancing reliability and operational pressure limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gates with sharp edges are used in rotary fluid machines, then the structure is simple and easy to manufacture, but wear and tear increases when handling abrasive or corrosive fluids
Solution Approach 1:
The gate is designed with rounded corners instead of sharp edges. Specifically, the gate includes a leading end with a rounded corner having a radius of curvature between 0.5mm and 2.0mm, and a trailing end with a rounded corner having a radius of curvature between 1.0mm and 3.0mm. This curvature design reduces stress concentration and wear when handling abrasive or corrosive fluids, thereby improving reliability without significantly complicating the manufacturing process.
2Reliability
If tight tolerances are maintained to prevent fluid leakage, then sealing performance improves, but manufacturing complexity and cost increase
Solution Approach 1:
A tolerance gap is pre-established between the gate and the stator circumferential surface. This gap, typically ranging from 0.05mm to 0.20mm, is designed into the machine geometry before operation. Combined with the rounded corners on the gate, this preliminary design feature allows fluid sealing to be achieved through the hydrodynamic effect of the gap rather than relying on extremely tight mechanical tolerances, thereby reducing manufacturing complexity while maintaining reliable sealing performance.
3Reliability
If the rotor and stator are positioned close together to improve fluid sealing, then sealing efficiency increases, but fluid leakage through slots increases
Solution Approach 1:
The rounded corners on the gate (leading end radius 0.5mm-2.0mm, trailing end radius 1.0mm-3.0mm) work in conjunction with the U-shaped channel geometry to control fluid flow patterns. The curved surfaces guide the fluid smoothly, creating a hydrodynamic seal that prevents leakage through the slots between the rotor and stator, thereby reducing fluid loss while maintaining effective sealing.
Solution Approach 2:
The tolerance gap between the gate and stator is pre-designed at optimal dimensions (0.05mm-0.20mm). This preliminary dimensional design ensures that the gap is sufficient to prevent contact and wear while being small enough to maintain effective fluid sealing, thereby preventing both excessive leakage and mechanical interference.
4Power
If high-pressure operations are implemented, then machine output increases, but fluid leakage and reliability issues worsen
Solution Approach 1:
The rounded corners and curved surfaces of the gate distribute high pressure more evenly across the gate structure, preventing stress concentration that would lead to failure. The leading end rounded corner (radius 0.5mm-2.0mm) and trailing end rounded corner (radius 1.0mm-3.0mm) specifically mitigate stress at the most vulnerable points, enabling the machine to operate reliably at high pressures while maintaining structural integrity.
Solution Approach 2:
The tolerance gap is pre-established at dimensions that maintain effective sealing under high-pressure conditions. This preliminary design of the gap (0.05mm-0.20mm) ensures that even under high pressure, fluid leakage is controlled and the gate-stator interface remains stable, thereby maintaining operational reliability at elevated power levels.
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 solution effectively reduces wear and tear, enhances fluid sealing, and allows for higher pressure operations, improving the reliability and efficiency of rotary fluid machines when handling abrasive or corrosive fluids.
Implementation Method 1
the rounded corners and the curved surfaces lie closely adjacent to and substantially parallel with each other
Implementation Method 2
The sealing system includes dynamic seals and radially extending channels to prevent fluid flow through slots and maintain a tolerance gap
Data Source
AI summary
A rotary fluid machine 10 has a rotor 12, a stator 14, and a plurality of gates. The rotor 12 and stator 14 are rotatable relative to each other and arranged one inside the other to define a working chamber 18 there between. Gates 16 are supported in radial gate slots 20 formed in the rotor 12 and cyclically extend from and retract into the gate slots 20 as the rotor 12 rotates about stator 14. A plurality of demountable lobes is supported on an outer circumferential surface 24 of stator 14. The surface 24 forms a surface of the working chamber 18. Circumferential surface 24 is composed of an intermediate surface 48 which extends in an axial direction and opposite curved surfaces 46. The gate 16 has opposite rounded corners 130 separated by an axial planar surface 132. The shape and configuration of the gate 16 and corresponding is made to match that of the outer circumferential surface 24 so that when the axial surface 132 lies substantially adjacent and parallel to intermediate surface 48 each of the curved surfaces 130 lie closely adjacent to and substantially parallel with the concavely curved surfaces 46.