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Diaphragm pump one-way valve fault self-diagnosis device and diagnosis method

A diagnostic method and one-way valve technology, applied in pump testing, liquid variable displacement machinery, machines/engines, etc., can solve the waste of resources and equipment, lack of self-adaptive evaluation mechanism for maintenance and replacement of one-way valves, and no one-way Valve fault automatic diagnosis system and other issues to achieve the effect of improving accuracy and reliability

Active Publication Date: 2018-04-24
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the application and research of check valves in high-pressure diaphragm pumps are mainly focused on the monitoring of process parameters. No matter whether it is imported or domestic diaphragm pumps, there is no automatic fault diagnosis system for check valves. to the timeliness and accuracy of troubleshooting
In addition, the maintenance and replacement of the one-way valve lacks an adaptive evaluation mechanism, and a regular (usually 1200 hours) inspection and maintenance and replacement mechanism is usually adopted
Regular replacement will inevitably result in waste of resources and equipment (sometimes the replaced one-way valve is not broken and can still be used)
However, due to the lack of an adaptive evaluation mechanism, it is impossible to perform early warning replacement when the check valve is close to damage

Method used

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  • Diaphragm pump one-way valve fault self-diagnosis device and diagnosis method
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  • Diaphragm pump one-way valve fault self-diagnosis device and diagnosis method

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Effect test

Embodiment 1

[0037] Embodiment 1: When the feeding one-way valve is stuck, the fault self-diagnosis steps of the present invention are as follows:

[0038] Step 1. In the first T / 2 cycles, the pressure transmitter 6 collects the pressure signal of the feed check valve 12 . The average amplitude of the pressure signal AM_mean=P_in is calculated by formula (A), and |AM_mean-P_out|>0. That is, it is shown as the feed pressure P_in, which does not rise to the normal discharge pressure P_out. The preliminary judgment result is that the feed check valve is faulty, such as Figure 4 shown.

[0039] Step2, the acceleration sensor 7 collects the vibration signal of the feed check valve 12, calculated by the formula (B), at the time of the previous T / 2, the average amplitude of the vibration signal AM_mean>0; at the time of the rear T / 2, the average amplitude of the signal Value AM_mean<0. Repeat for subsequent sampling periods with consistent regularity. The periodic "convex" feature of the si...

Embodiment 2

[0041] Embodiment 2: When a stuck fault occurs in the discharge check valve, the fault self-diagnosis steps of the present invention are as follows:

[0042] Step1, in the last T / 2 cycles, the pressure transmitter 6 collects the pressure signal of the discharge check valve 5, and calculates the average amplitude of the pressure signal AM_mean=P_out>P_in (normal feed pressure by formula (A) ), and |AM_mean-P_in|>0. The preliminary judgment result is that the discharge check valve is faulty, and the display results are as follows: Figure 7 shown.

[0043]Step2. The acceleration sensor 7 collects the vibration signal of the discharge check valve 5, and is calculated by the formula (B). At the time of the first T / 2, the average amplitude of the vibration signal AM_mean>0; at the time of the last T / 2, the average amplitude of the signal is AM_mean<0. Repeat for subsequent sampling periods with consistent regularity. The periodic "convex" feature of the signal is obtained, and ...

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Abstract

The invention relates to a fault self-diagnosis device for a one-way valve of a membrane pump and a diagnosis method, and belongs to the technical field of automatic control. The fault self-diagnosis device comprises pressure transmitters, acceleration sensors, high masked data connecting lines, a multichannel data collecting card, an industrial control computer and a fault alarm. According to the fault self-diagnosis device, the fault of the one-way valve of the membrane pump can be monitored in real time, operation and maintenance personnel can be reminded to maintain or replace the one-way valve in time, and the huge loss caused by the fault of the one-way valve is avoided. Meanwhile, technological parameter detection and a signal processing based detection method are organically combined, and the accuracy and reliability of fault judgment of the one-way valve of the membrane pump are improved.

Description

technical field [0001] The invention relates to a diaphragm pump one-way valve fault self-diagnosis device and a diagnosis method, belonging to the technical field of automatic control. Background technique [0002] Large-scale diaphragm pumps belong to the category of reciprocating pumps. They are used to transport solid-liquid two-phase media under complex working conditions such as high pressure, high temperature, and high corrosion. They are widely used in industrial production fields such as petroleum, chemical industry, coal, metallurgy, sugar refining, and sewage treatment. . As an important mechanical part of the pump, the check valve needs to have good quick opening / closing, sealing and pressure resistance, so it is more prone to failure than other parts of the pump. The failure of the one-way valve will cause the pressure and flow of the equipment to fluctuate, which will cause equipment vibration, cause equipment damage, and even cause major safety production acc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B51/00
CPCF04B51/00
Inventor 马军吴建德王晓东姜迪冷婷婷范玉刚黄国勇邹金慧李富玉张馨予
Owner KUNMING UNIV OF SCI & TECH