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Abstract:
A novel test apparatus used to measure the pressure distribution of the
non-circular opening spool is proposed. Thus the mechanism of the noise
differences related to the different spools can be investigated. A
method using this test apparatus is also developed to measure the
pressure distributions on the grooves and the walls of return chamber.
This method being developed is named as “the method of the sleeve
shift”. The key point of this method is to stop the leakage among these
small holes. Several ways are introduced, which include the hydraulic
force used to close the gaps between the sleeve and valve body, the
expansion effect of the sleeve wall in the return chamber on the gaps
between holes to minimize the internal leakage and a high requirement of
small clearances between the body, the spool and the sleeve. The effect
of this test apparatus on the flow field inside the valve is limited to
the minimum to improve the accuracy of the method proposed. The
experiment-al results
are agreed well with the CFD results. The test apparatus and
correspondence methods to measure the pressure distribution are
easy to be standardized and used for other hydraulic components with the
grooves.
Key words: Non-circular opening spool valve Throttling grooves Pressure
distribution measurement Flow field simulation
CLC No:
TH137.5
国家自然科学基金
(50175097)和高等学校博士学科点专项科研基金(20010335037)资助项目. Received 30927, received in
revised form 20031225
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