Control Valve Leakage Path Design for Rotary Pump Governability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control valves in rotary pumps face challenges in efficiently managing the throughflow volume and reducing vibration of delivered fluids, leading to suboptimal governability and increased fluid vibration.
Innovation Solution
A control valve design featuring a piston space subdivided into multiple valve spaces with intentionally designed leakage paths, where the first leakage path is larger than the second leakage path, achieved through varying sealing gaps and piston surface areas, allowing for controlled fluid flow and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional control valves are used in rotary pumps, then the basic control function is provided, but the governability is suboptimal and fluid vibration increases
Solution Approach 1:
The piston space is divided into multiple valve spaces (first, second, third valve spaces) separated by sealing gaps. This segmentation allows different leakage paths with different characteristics to be created, enabling independent control of fluid flow through each path. The control piston subdivides the piston space into at least a first valve space and a second valve space, with a third valve space also present, allowing differentiated leakage management
Solution Approach 2:
Different sealing gaps are created with different dimensions to provide different leakage characteristics. The first sealing gap between the control piston and valve housing provides a first leakage path with specific flow characteristics, while the second sealing gap provides a second leakage path with different characteristics. This local differentiation of gap sizes enables optimized control across different operating conditions, improving governability and reducing fluid vibration
2Reliability
If tight sealing is used between valve spaces, then leakage is minimized, but pressure distribution and governability are reduced
Solution Approach 1:
Instead of using a single sealing gap with uniform dimensions, the invention employs sealing gaps with different dimensional parameters. The first sealing gap has different dimensions compared to the second sealing gap, allowing each gap to provide appropriate leakage characteristics for its specific function. This parameter differentiation maintains reliable sealing while enabling the desired leakage paths for pressure control
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 enhances the spread of pressure over the duty cycle, improving governability and reducing fluid vibration by allowing a 4% change per bar instead of 2% change, thereby optimizing pump performance.
Implementation Method 1
The first valve space and second valve space are connected to each other via a first leakage path, wherein the first leakage path is an intended or design-specific leakage path which is not set by the tolerances of the components. The first leakage path sets a desired first leakage, i.e. a preferably predetermined or design-specific first leakage, between the first valve space and the second valve space.
Implementation Method 2
The control piston can preferably sub-divide the piston space into at least three valve spaces, wherein the first valve space and the third valve space immediately follow the second valve space on opposite sides
Data Source
AI summary
A control valve including: a valve housing including a piston space; and a control piston which is movably arranged in the piston space and sub-divides the piston space into at least a first valve space and a second valve space, the control valve including at least a leakage path which sets a desired leakage between the first valve space and the second valve space. A motor vehicle device including an adjustable rotary pump including an adjusting means, for adjusting a delivery volume of the rotary pump, and the control valve, using which a pressure for adjusting the adjusting means can be governed, the motor vehicle device including a means which presses the control piston into a first position and holds it there, and the at least one other inlet of the control valve is connected to a high-pressure side of the rotary pump when the rotary pump is in operation.