Self-Rotating Control Valve to Reduce Cavitation Damage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing hydraulic impact devices in rock breaking apparatuses face durability issues due to the limitations of conventional control valves.
Innovation Solution
A control valve with elongated design and radial slanted surfaces that generate torque when subjected to hydraulic fluid flow, allowing the valve to rotate and change position automatically without external actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional control valve is used in a hydraulic impact device, then the device can control hydraulic fluid flow, but the control valve suffers from reduced durability due to cavitation damage and lack of automatic position adjustment
Solution Approach 1:
The control valve is designed with slanted radial surfaces that automatically generate torque when hydraulic fluid flows over them during cavitation events. This self-generated torque rotates the control valve to change its position, allowing it to self-adjust and avoid prolonged exposure to harmful cavitation zones, thereby improving its own durability without external intervention
Solution Approach 2:
The invention converts the harmful cavitation fluid flow into a beneficial force by designing slanted surfaces that transform the linear fluid flow into rotational torque. The cavitation fluid that would normally cause damage instead generates the torque needed to rotate the control valve, protecting it from damage while maintaining its control function
2Ease of operation
If external actuators are used to adjust control valve position, then precise control is achieved, but device complexity and cost increase
Solution Approach 1:
The control valve eliminates the need for external actuators by incorporating slanted radial surfaces that automatically generate rotational torque from hydraulic fluid flow. The valve self-adjusts its position based on the fluid flow dynamics, achieving ease of operation without adding complex external control mechanisms
Solution Approach 2:
The invention removes external actuators from the system entirely, extracting the position adjustment function from the control valve design and replacing it with an intrinsic self-adjustment mechanism based on slanted surfaces that convert fluid flow into rotational motion
3Reliability
If the control valve is designed with slanted radial surfaces, then automatic rotation and durability are improved, but manufacturing complexity may increase
Solution Approach 1:
The slanted surfaces are applied locally only to specific radial surfaces of the control valve where fluid flow contact occurs during operation. This localized application of the slanted surface feature minimizes manufacturing complexity while maximizing the durability benefit in the critical areas subjected to cavitation
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
The solution enhances the durability of the control valve by allowing it to adjust its position automatically, reducing the risk of cavitation damage, and simplifies manufacturing while requiring minimal modifications to the impact device.
Implementation Method 1
the fluid flow causes on the slanted surfaces torque around the central axis of the control valve and makes the control valve to rotate
Implementation Method 2
The control valve may be subjected to cavitation whereby cavitation damages of the control valve can be decreased
Data Source
AI summary
A control valve, an impact device for a rock breaking apparatus, and a method are provided. The control valve is an elongated piece with a central axis and radial outer and inner surfaces (Ros, Ris). The control valve includes several control surfaces disposed at axial distances from each other for controlling hydraulic fluid flows (Hff) in response to axial control movement (M). One or more radial surfaces of the control valve include one or more slanted surface (SS) a longitudinal direction of which have oblique orientation in relation to the central axis (Ca) of the control valve. The control valve rotates or turns during a working cycle due to hydraulic flow effecting on the slanted surfaces.