Screw Spindle Pump Gas Liquid Mixture Delivery
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Solution Overview
Problem
Conventional screw spindle pumps experience inefficiencies when delivering gas/liquid mixtures with large gas proportions due to hyperbolic pressure buildup from liquid backflow through gaps, leading to high power requirements and potential damage from compressing fluids with high liquid content.
Innovation Solution
The method involves optimizing the pump geometry and rotational speed to minimize liquid backflow by ensuring the liquid acts as a rigid wall during gas compression, reducing pressure increase to 20% or less of the suction to outlet pressure difference, and using a smaller number of pump chambers to maintain efficiency even with high gas proportions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional screw spindle pumps deliver gas/liquid mixtures with large gas proportions, then the pump can handle diverse fluid compositions, but hyperbolic pressure buildup occurs due to liquid backflow through gaps, resulting in high power requirements
Solution Approach 1:
The patent changes the operating parameters by controlling the rotational speed of the spindles and adjusting the pump geometry to minimize liquid backflow. This optimization ensures that the pressure increase in pump chambers remains below 20% of the suction to outlet pressure difference, significantly reducing power consumption while maintaining the ability to deliver gas/liquid mixtures with varying compositions
2Power
If gas compression is achieved by changing compressor chamber geometry, then efficient gas compression is achieved, but the approach cannot handle applications with large liquid proportions as the fluid would require excessive compression forces
Solution Approach 1:
The patent creates a universal pump system that can efficiently handle both gas/liquid mixtures with large gas proportions and applications with large liquid proportions (up to 100% liquid). This is achieved by maintaining a pressure increase limit of 20% or less in pump chambers, which prevents excessive compression forces while still enabling effective gas compression through controlled liquid backflow minimization
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
This approach significantly reduces power requirements by minimizing liquid backflow and torque contributions, allowing efficient delivery of gas/liquid mixtures with large gas proportions while maintaining efficiency for pure liquids, and enabling delivery of fluids with up to 100% liquid content.
Implementation Method 1
owing to the compressibility of the gas proportion and to the constantly present radial and axial gaps between the individual spindles or between the spindles and the housing, liquid can flow from chambers with a relatively high pressure back into the preceding chambers, whereby the gas present there is compressed
Implementation Method 2
the pressure increases at least approximately linearly from a pressure at the fluid inlet to a pressure at the fluid outlet
Data Source
AI summary
Method for delivering a gas/liquid mixture fluid via a screw spindle pump that has a housing in which a drive spindle and a running spindle are accommodated. The spindles delimit together with the housing multiple pump chambers. A respective one of the pump chambers that is initially open toward the respective fluid inlet is closed off. The resulting closed-off pump chamber is moved axially toward the fluid outlet and, there, upon attainment of an opening rotation angle, is opened toward the fluid outlet. The drive spindle is driven so that the pressure in the respective pump chamber prior to and/or upon attainment of the opening rotation angle is increased in relation to the suction pressure of the screw spindle pump by at most 20% or by at most 10% of a difference in pressure between the suction pressure and the pressure in the region of the fluid outlet.