A screw compressor fault diagnosis method and system

Abstract

The invention discloses a method and system for judging faults of screw compressors, wherein the method for judging faults comprises the following steps: step A, monitoring whether the screw compressor is stopped, and in the case of the stoppage of the screw compressor, jumping to step B; step B , From the time when the screw compressor is stopped, after a set period of time, check whether the normally closed contact of the pressure switch is disconnected. If the normally closed contact of the pressure switch is not disconnected, it is judged that the screw compressor is faulty. The invention utilizes the existing equipment, according to the working principle of the screw compressor, and can realize the timely identification of the fault state of the screw compressor by adding a logic judgment function in the control unit, which is simple and reliable, and ensures the operation safety of the locomotive and the vehicle.

Description

technical field [0001] The invention particularly relates to a screw compressor fault judgment method and system. Background technique [0002] The existing locomotive air source system uses a screw compressor. During the control process of the screw compressor, the air pressure in the screw compressor is generally monitored through an internal pressure switch. When the internal pressure exceeds a certain value, the pressure switch is disconnected. The switch outputs an unavailable signal to prevent the locomotive from starting the screw compressor to start the screw compressor with load and damage the screw compressor. [0003] At the same time, when the internal pressure of the screw compressor is lower than the set pressure, the pressure switch outputs an available signal of the screw compressor, allowing the screw compressor to start. [0004] However, in the prior art, when a fault such as a broken shaft occurs inside the screw compressor and the air blowing ability is...

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Problems solved by technology

[0004] However, in the prior art, when a fault such as a broken shaft occurs inside the screw compressor and the air blowing ability is lost, the pressure switch will still output a usable signal, which cannot be protected and prompted. At this time, the air source system cannot provide the braking system Compressed air cannot guarantee the effectiveness of the braking force of locomotives and vehicles, which will affect the safe operation of locomotives and vehicles

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