Research On Testing Method Of Pressure In Axial Piston Pump Cavity

The axial plunger pump is the important component of the hydraulic system,and plays an important role in the aerospace,engineering machinery,marine and other industrial fields.Vibration,noise and flow pulsation are the three key indicators that affect the performance of the plunger pump.These indicators are related to the pressure in the plunger cavity.The predecessors carried out the pressure test of the plunger pump cavity by building an experimental platform,etc.,but these methods have a large workload and the test accuracy is low.Therefore,the design of a reasonable pressure test method for the plunger cavity is helpful to promote the research of the axial plunger pump,and has important engineering significance and high academic value.In this paper,according to the characteristics and structural of the axial piston pump,a wireless test method for the pressure in the piston pump cavity is designed.This method is based on the existing wireless sensor technology,by installing a miniature pressure sensor at the transition zone of the plunger pump cylinder;designing the sensor wiring holes on the cylinder and the rotating shaft;arranging wireless data collection and receiving at the rotating shaft and the rear cover Node to achieve wireless testing of the pressure in the plunger pump cavity.This method has high data acquisition accuracy and minimizes the impact on the working characteristics of the plunger pump.In terms of hardware design of the acquisition node,a modular design idea is adopted for the application of the node.Design data amplification module,data acquisition and processing module,data storage module,wireless data transmission module and wireless power supply module.Using such a hardware structure can enhance the performance of the node,reduce the complexity of the node circuit design,and enable it to perform continuous high-speed data collection.In terms of software design of the acquisition node,a software design method based on an embedded real-time operating system is adopted to improve the portability and stability of the software.At the end of the article,the node’s data collection accuracy and data wireless transmission and reception were tested and analyzed.After testing,the node has high stability and precision,and can still transmit data wirelessly in an environment full of hydraulic oil,which can meet the data collection and wireless transmission of the internal pressure of the axial piston pump.