Movable-Blade Hydraulic Actuation Without a Pressure Oil Tank
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Solution Overview
Problem
Existing movable-blade operation systems for hydraulic machines, such as bulb turbines, face challenges with high hydraulic oil usage and environmental impact due to oil leakage, and require extensive remodeling and long maintenance times when transitioning from pressure oil tank systems to direct-pressurizing systems.
Innovation Solution
A movable-blade operation system that includes an oil hydraulic cylinder within the rotational shaft, a bidirectional pump, a pump drive motor, and a control unit, allowing direct pressurization of hydraulic oil to adjustable runner vanes without a pressure oil tank, reducing oil usage and enabling easier system modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure oil tank and compressor system is used, then the movable blades can be adjusted reliably, but a large amount of hydraulic oil is consumed and environmental harm increases due to oil leakage
Solution Approach 1:
The invention extracts and removes the pressure oil tank from the system, transitioning to a direct-pressurizing configuration where hydraulic oil is supplied directly from the hydraulic oil supply device to the oil hydraulic cylinder without intermediate storage, thereby reducing hydraulic oil consumption and environmental harm
Solution Approach 2:
The invention introduces a check valve as an intermediary component in the direct-pressurizing configuration to maintain pressure and ensure reliable operation of the movable blades without requiring a large pressure oil tank, thus resolving the contradiction between reliability and oil consumption
2Quantity of substance
If a direct-pressurizing system is implemented, then hydraulic oil consumption is reduced, but extensive remodeling of the hydraulic machine body is required
Solution Approach 1:
The invention designs the direct-pressurizing configuration with standardized components and interfaces that can be applied to various hydraulic machine types (bulb turbines, Kaplan turbines), making the system universally adaptable and reducing modification workload through multi-functional design
Solution Approach 2:
The invention segments the hydraulic system into modular components (hydraulic oil supply device, check valve, oil hydraulic cylinder) that can be independently installed and configured, facilitating easier system modification and reducing overall remodeling complexity
3Ease of operation
If the runner vane controller is installed within the main body near the rotational shaft, then direct pressurization is achieved, but the modification process becomes complex and time-consuming
Solution Approach 1:
The invention incorporates preliminary design considerations for direct pressurization in the controller configuration, pre-positioning the hydraulic oil supply device and connecting pathways to enable direct pressurization without extensive on-site remodeling, thus reducing modification time
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 hydraulic oil consumption, minimizes environmental impact, and allows for lower energy consumption and easier maintenance by eliminating the need for extensive remodeling, while maintaining efficient operation of the movable blades.
Implementation Method 1
a bidirectional pump, a pump drive motor for driving the bidirectional pump... The bidirectional pump selectively feeds pressurized hydraulic oil to one of the first cylinder chamber and the second cylinder chamber
Implementation Method 2
an oil hydraulic cylinder in the rotational shaft... The oil hydraulic cylinder includes a piston connected to the movable blades, and a first cylinder chamber and a second cylinder chamber defined by the piston
Data Source
AI summary
A movable-blade operation system for a hydraulic machine according to an embodiment includes an oil hydraulic cylinder installed within a rotational shaft, a bidirectional pump, a pump drive motor, a control unit, and an oil head installed in the hydraulic machine. The bidirectional pump selectively feeds pressurized hydraulic oil to one of a first cylinder chamber and a second cylinder chamber. The oil head couples the rotational shaft rotatably, and the hydraulic oil fed from the bidirectional pump to the first cylinder chamber and the second cylinder chamber flows through the oil head. The bidirectional pump, the pump drive motor, and the control unit are installed outside the hydraulic machine.