Breaking Device Pressure Chamber Cavitation Control
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Solution Overview
Problem
Cavitation in the pressure chamber of breaking devices, such as rock drilling machines and breaking hammers, leads to deterioration of the frame and malfunction due to the continuous variation of pressure, causing metal pieces to detach and potentially leading to pressure medium leakage.
Innovation Solution
The breaking device incorporates multiple low and high pressure ports and channels connected to accumulators positioned at the outer circumference of the frame, arranged in specific radial and axial directions to minimize pressure losses and cavitation effects, along with a control valve to manage pressure flow between the rear and front pressure chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single low pressure port and channel configuration is used in the rear pressure chamber, then the device structure is simple, but cavitation occurs causing metal detachment and frame deterioration
Solution Approach 1:
The single low pressure port and channel is divided into multiple segments (at least two low pressure ports and channels) arranged at different positions in the axial direction. This segmentation distributes the pressure relief function across multiple locations, preventing cavitation at any single point and eliminating the metal detachment problem while maintaining reasonable structural complexity.
2Ease of operation
If pressure medium flows continuously through the rear pressure chamber, then the percussion piston moves smoothly, but cavitation causes harmful deterioration of the frame
Solution Approach 1:
Multiple low pressure accumulators are introduced as intermediary elements between the rear pressure chamber and the external environment. These accumulators act as buffer zones that absorb pressure fluctuations and prevent direct cavitation formation in the frame, allowing smooth percussion piston movement while protecting the frame from cavitation damage.
3Volume of moving object
If accumulators are positioned at the same axial position, then the device structure is compact, but pressure losses increase and cavitation effects are not minimized
Solution Approach 1:
The accumulators are arranged not only in the radial direction but also distributed in the axial direction at different positions. This three-dimensional arrangement optimizes the pressure distribution throughout the rear pressure chamber, minimizing pressure losses and cavitation effects while maintaining a compact overall device volume through efficient spatial utilization.
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 configuration reduces cavitation, maintains pressure stability, and prevents metal detachment, ensuring the operational integrity and efficiency of the breaking device by effectively managing pressure dynamics.
Implementation Method 1
Due to a continuous variation of the pressure of a pressure medium in the rear pressure chamber, cavitation may occur in the rear pressure chamber
Implementation Method 2
For moving the percussion piston into the impact direction, a high pressure is provided into the rear pressure chamber. For moving the percussion piston back, i.e. towards the return direction, a low pressure is provided in the rear pressure chamber
Data Source
AI summary
A breaking device includes a frame, an impact device having a pressure chamber with a rear pressure chamber and a front pressure chamber. The breaking device further includes a first low pressure port at the rear pressure chamber, a first low pressure channel and a first low pressure accumulator connected to the first low pressure channel. The breaking device further includes a second low pressure port at the rear pressure chamber substantially opposite to the first low pressure port, second low pressure channel and a second low pressure accumulator connected to the second low pressure channel. The first low pressure accumulator and the second low pressure accumulator are arranged at the outer circumference of the frame of the breaking device at different positions in the axial direction of the breaking device.