Liquid Ring Pump Inclined Bottom Wall for Suction Pressure
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Solution Overview
Problem
Liquid ring pumps are limited by vapor pressure of the ring liquid and dynamic flow processes, leading to restricted suction pressure and high noise levels, making them less suitable for applications requiring lower suction pressures and quieter operation.
Innovation Solution
The design includes eccentrically positioned impellers with inclined bottom walls and separate pumping chambers, along with non-return valves and a control ring, to optimize the flow of gases and liquids, reducing mixture formation and enhancing suction pressure while minimizing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If conventional liquid ring pump design is used, then the pump can convey gases and generate vacuum, but the achievable suction pressure is limited by vapor pressure of ring liquid and dynamic flow processes
Solution Approach 1:
The pump wheel is divided into multiple independent pumping chambers separated by partition walls, each chamber handling gas compression and discharge independently. This segmentation allows optimized flow paths and reduces the impact of vapor pressure limitations on overall pump performance.
Solution Approach 2:
The bottom wall of each pumping chamber is inclined specifically at the outlet opening area to promote streamlined flow and complete gas expulsion, while other areas maintain the liquid seal. This localized geometric modification optimizes the critical region where gas-liquid separation occurs without compromising the overall liquid ring seal.
2Productivity
If conventional liquid ring pump design is used, then the pump can compress and displace gas, but dynamic flow processes cause liquid-gas mixture formation and deflagration
Solution Approach 1:
The bottom wall is inclined specifically in the region of the outlet opening to create a streamlined shape that directs gas flow smoothly toward the discharge opening. This localized geometric feature prevents sudden pressure relief and reduces the formation of liquid-gas mixtures that could cause deflagration.
Solution Approach 2:
The inclined bottom wall design proactively prevents the formation of harmful liquid-gas mixtures by establishing streamlined flow conditions before gas discharge occurs. This preventive geometry reduces the risk of deflagration by avoiding sudden pressure changes and mixture formation in the first place.
3Reliability
If conventional liquid ring pump design is used, then the pump can seal impeller from pump housing, but sudden pressure relief causes high noise levels
Solution Approach 1:
The inclined bottom wall at the outlet opening creates a streamlined flow path that prevents sudden pressure relief. This localized geometric modification smooths the discharge process and significantly reduces the noise generated by deflagration, while maintaining the overall sealing function of the liquid ring.
Solution Approach 2:
The streamlined bottom wall geometry proactively prevents sudden pressure relief by establishing smooth gas flow toward the outlet opening. This preventive design eliminates the conditions that lead to noisy deflagration events while preserving the reliable sealing function of the liquid ring pump.
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 design allows for suction pressures closer to the vapor pressure of the ring liquid, reduces noise, and improves the efficiency of the liquid ring pump by ensuring complete expulsion of gases and minimizing deflagration effects.
Implementation Method 1
forms a liquid ring along the inner circumference of the pump housing due to centrifugal force when the pump wheel rotates at a sufficient speed
Implementation Method 2
the pump liquid also serves as a cooling medium and, in particular, absorbs the thermal energy that occurs during the compression of the gases
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
The invention relates to a liquid ring pump (1), which has a pump housing (2), which surrounds a pump chamber (3), into which a pump liquid (14) is filled in the normal operating state. Furthermore, the liquid ring pump (1) has an impeller (4) for conveying a gaseous working medium, which impeller is arranged within the pump chamber (3) and can be rotated about an axis of rotation (6). The impeller (4) has, on the outer circumference thereof, a number of conveying chambers (8) separated from each other at least in the circumferential direction. The impeller (4) also has, for each conveying chamber, an outlet opening (12) associated with the conveying chamber (8) for fluidically connecting the conveying chamber (8) to a pressure region (20) of the pump chamber (3), the outlet opening being formed locally in a bottom wall (24) of the impeller (4) that delimits the conveying chamber (8) radially inside. The bottom wall (24) extends along the axis of rotation (6) on both sides of the outlet opening (12), at least in some portions with a tilt with respect to the axis of rotation (6), toward the outlet opening (12). Said outlet opening (12) is arranged at a point of the conveying chamber (8) having the smallest radial distance from the axis of rotation (6).