Rotating Control Valve for Mining Hydraulic Cavitation
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Solution Overview
Problem
Control valves in hydraulic systems of mining machines, such as rock drilling machines, suffer from cavitation damages due to the concentrated pressure fluid flow, leading to chipping and potential blockages, which reduces their durability and service life.
Innovation Solution
The control valve openings are designed to allow the pressure fluid to rotate the valve, distributing the cavitation effects over a larger area by having walls that are not parallel to the radial direction, thereby reducing the concentration of damage on a single area of the inner surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control valve has openings enabling pressure fluid flow to discharge channel and tank, then the control valve can control hydraulic flow, but cavitation damages occur on the inner surface of the valve
Solution Approach 1:
The control valve is designed to rotate about its longitudinal axis during operation. This dynamic movement transforms the static valve into a rotating component, causing cavitation damages to be distributed across different areas of the inner surface over time rather than concentrated at a single location, thereby extending service life
Solution Approach 2:
The opening in the control valve is designed with asymmetric positioning and orientation relative to the valve axis. This asymmetric configuration creates an unbalanced force distribution when pressure fluid flows through the opening, generating a moment that causes the valve to rotate, which in turn distributes cavitation damage across the valve surface
2Productivity
If the pressure fluid flows through the opening in the control valve, then the hydraulic system can discharge fluid to the tank, but metal chips are generated that may cause blockages
Solution Approach 1:
The cavitation effect, which was previously a harmful factor causing localized damage and metal chip generation, is converted into a beneficial force that drives the rotation of the control valve. By positioning the opening asymmetrically, the pressure differential across the valve wall creates a rotational moment, transforming the harmful cavitation into a useful driving force for valve rotation
Solution Approach 2:
The control valve transitions from a static component to a dynamically rotating component. This rotation continuously changes the location where cavitation occurs and where metal chips are generated, preventing accumulation at a single point and reducing the likelihood of blockages in the hydraulic system
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 extends the service life and life cycle of the control valve by dispersing cavitation damages over a larger area, reducing the risk of chipping and blockages, and enhancing the overall durability of the valve.
Implementation Method 1
the at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve... such that the pressure fluid flowing through the opening may be arranged to rotate the control valve
Implementation Method 2
cavitation damages may occur on the inner surface of the sleeve-like valve on the side opposite to the opening through which the pressure fluid flows
Data Source
AI summary
A control valve for controlling flow of a pressure fluid in a breaking device includes a sleeve-like control valve having at least one opening enabling flow of the pressure fluid through the opening. The at least one opening includes at least one wall, at least a part of which is not arranged in a direction parallel to a radial direction of the control valve extending through the middle point of the cross section of the opening on the outer circumference of the control valve, such that the pressure fluid flowing through the opening may be arranged to rotate the control valve about the longitudinal axis of the control valve.