Measurement of reed valve kinematics

Michael Fenkl,Václav Dvořák,Tomáš Vít,P Dančová,M Veselý

doi:10.1051/epjconf/201611402020

Abstract

The measurement of key kinematic parameters of a reed valve movement is necessary for the further development of the reed valve system. These parameters are dependent on the geometry and material properties of the valve. As they directly affect the quantity of air flowing around the valve, a simple and easy to implement measurement of various valve configuration based on the air flow has been devised and is described in this paper, along with its technical parameters and drawbacks when evaluating reed valves used in reciprocating air compressors. Results are presented for a specimen of a compressor under examination. All kinematic parameters, and timing of the opening and closing of the valve, obtained from the measurement are presented and discussed.

Highlights

Reed valve systems are thanks to their simplicity frequently used for regulation of suction and discharge strokes of reciprocating compressors
The measurement of key kinematic parameters of a reed valve movement is necessary for the further development of the reed valve system
As they directly affect the quantity of air flowing around the valve, a simple and easy to implement measurement of various valve configuration based on the air flow has been devised and is described in this paper, along with its technical parameters and drawbacks when evaluating reed valves used in reciprocating air compressors

Summary

Introduction

Reed valve systems are thanks to their simplicity frequently used for regulation of suction and discharge strokes of reciprocating compressors. Measurement on a test stand, where the valve motion is simulated using compressed gas and the motion is recorded by a high-speed camera, is one of the simplest measurement methods [1] This approach, does not reflect all effects present during realworld operation of the compressor. Given the substantial complexity of the computations and quantity of the input data the interaction of a compressible fluid (gas) and a non-rigid body (valve) is greatly simplified, leading to less accurate results. Another approach is based on the use of an endoscope coupled to a high-speed camera to record a realistic reed valve movement [4], which requires, a rather complex data analysis. Another method is the examination of a combustion engine valve motion relative to the cam shape using a vibrometer [5]

Measurement setup

Results and discussion

Drawbacks of the measurement method