Hydrostatic Drive Throttle for Cavitation Prevention
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Solution Overview
Problem
Existing hydrostatic drives face inefficiencies and high costs due to the need for large hydraulic components to handle maximum pressure medium volume flow, which occurs rarely, leading to cavitation risks and suboptimal operation.
Innovation Solution
A hydrostatic drive with a double-acting hydraulic cylinder and a pressure medium connection system that includes a third throttle device with an adjustable opening cross section, allowing partial volume flow regeneration and pressure control to prevent cavitation, enabling smaller hydraulic machine and pump designs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-capacity hydraulic components are used to handle maximum pressure medium volume flow, then the system can accommodate peak demand, but the components operate far below capacity most of the time, increasing costs and reducing efficiency
Solution Approach 1:
The patent applies dynamics by making the throttle device adjustable, allowing the opening cross-section to be adapted to different operating conditions. This enables the hydraulic system to optimize flow rates dynamically, matching component operation to actual demand rather than operating at fixed maximum capacity.
Solution Approach 2:
The patent changes the parameter of throttle opening cross-section to control pressure medium flow. By adjusting this parameter, the system can regulate flow rates to match actual operational needs, preventing oversized components from operating inefficiently while still handling peak demands when necessary.
2Reliability
If large-capacity hydraulic components are designed for maximum flow, then peak demand is met, but component size and cost increase
Solution Approach 1:
The adjustable throttle device allows the system to adapt to varying flow demands, enabling the use of smaller, more cost-effective hydraulic components that can be dynamically optimized rather than oversized for peak conditions only.
Solution Approach 2:
By adjusting the throttle opening cross-section parameter, the system can maximize the utilization of smaller hydraulic components, allowing them to operate closer to their optimal capacity range and reducing the need for expensive oversized equipment.
3Productivity
If pressure medium flows directly between piston chambers, then regeneration occurs and pump size is reduced, but cavitation risk increases in the expanding chamber
Solution Approach 1:
The throttle device acts as an intermediary between the piston chambers, controlling the pressure medium flow during regeneration. It mediates the flow rate to ensure sufficient pressure medium supply to the expanding chamber, preventing cavitation while maintaining regeneration efficiency.
Solution Approach 2:
The throttle device changes the flow parameter by adjusting its opening cross-section, regulating the pressure medium flow during regeneration to prevent cavitation in the expanding piston chamber while maintaining efficient energy recovery.
4Device complexity
If the throttle opening cross-section is fixed, then the system is simple, but it cannot adapt to varying pressure conditions and may cause cavitation
Solution Approach 1:
The throttle device is made adjustable rather than fixed, allowing the opening cross-section to be adapted to different pressure conditions and flow demands, preventing cavitation while maintaining reasonable system simplicity.
Solution Approach 2:
The throttle opening cross-section parameter can be adjusted to adapt to varying operating conditions, providing cavitation protection and optimized performance without significantly increasing system complexity.
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 solution reduces costs and improves efficiency by allowing the hydraulic pump to operate within its optimal range more frequently, while preventing cavitation and maintaining sufficient pressure for load handling.
Implementation Method 1
there is a constant need to prevent cavitation in the expanding piston chamber or at least to reduce the risk of cavitation
Implementation Method 2
a third pressure medium connection with a third throttle device with a third opening cross section which can be adjusted as a function of the pressure of the other piston chamber
Implementation Method 3
a second pressure medium connection, via which the other piston chamber can be supplied with a partial volume flow of an outflow volume flow flowing out of one piston chamber
Data Source
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AI summary
Offenbart is a hydrostatic drive with a hydraulic cylinder for moving a load, one piston chamber of which can be fluidically connected to a hydraulic machine and/or a hydraulic accumulator for recuperating hydraulic energy from the hydraulic cylinder. Offenbart is also a valve device for this drive.