System and method for measuring surface pressure of pump impeller blade

Abstract

The invention belongs to the technical field of water pumps, and discloses a system and a method for measuring the surface pressure of a pump impeller blade. The system comprises piezoelectric film sensors, a signal sending device, a signal receiving device, a data acquisition and monitoring system and a computer. The method comprises the following steps that the piezoelectric film sensors are stuck on the working surface and the back face of the pump impeller blade, a leading wire for the piezoelectric film sensors is introduced in a radial hole of a pump shaft through a wiring trough of an impeller rear cover plate and is further introduced in an axial hole of the pump shaft; the signal sending device is mounted on one side, close to a coupling, of the right side of the axial hole, and converts pressure signals into digital signals, the digital signals are wirelessly transmitted, are received by the signal receiving device, and are further transmitted to the data acquisition and monitoring system, and after being acquired, all the signals are transmitted to the computer to be analyzed. The problems of low applicability and low precision in a conventional method are solved, and the system is convenient and flexible to mount.

Description

technical field [0001] The invention belongs to the technical field of water pumps, in particular to a system and method for measuring the surface pressure of pump impeller blades. Background technique [0002] As a general-purpose machine, the pump is mainly used to convert the mechanical energy of the prime mover into the energy of the liquid. There are many types of pumps, and they are widely used in various sectors of the national economy and high-tech fields such as aerospace ships. When the pump is running under non-design conditions, there are generally unstable problems such as pressure pulsation, which will cause vibration and noise. In severe cases, the structural vibration of the pump unit will be aggravated, and sometimes resonance will be caused. Therefore, certain measures must be taken to predict and reduce the vibration of the pump and improve its operation stability. At present, it is the most critical and reliable method to analyze the pressure pulsation i...

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Problems solved by technology

[0003] Aiming at the problems existing in the above-mentioned existing measurement methods, the present invention proposes a system and a universal method capable of measuring the surface pressure of pump impeller blades, aiming to solve the current problem of measuring the surface pressure of blades, and proposes a method suitable for centrifugal pumps and axial flow pumps. Method for measuring surface pressure of impeller blades and general purpose mixed flow pumps

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