An integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion

Abstract

The present invention provides an integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion, characterized in that it includes the following steps: collecting signals; setting evaluation indicators; determining corresponding assignments according to the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators; respectively determining the weight coefficients of the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators; judging whether there is blockage according to the sum of the assignments of the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators multiplied by the corresponding weight coefficients. The present invention monitors the various characteristic parameter indicators of the integrated sewage pump station, and uses the fuzzy reasoning weighted fusion method to assign values ​​to various factors that affect the diagnosis of blockage faults to calculate a comprehensive evaluation index for judging the blockage of the pump station.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic machinery fault diagnosis, and in particular to an integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion. Background Art

[0002] Traditional concrete pumping stations have the disadvantages of being immobile, occupying a large area, consuming a lot of manpower and material resources, and having a low degree of automation, and they will produce waste gas and noise to pollute the environment. With the widespread application of integrated sewage pumping stations in the fields of river drainage, water conservancy regulation, and ecological restoration, pumping stations have to deal with sewage containing a large amount of waste at all times during operation. Real-time monitoring and fault diagnosis of pumping stations have become a rigid demand. At present, many pumping station monitoring systems used in China adopt the traditional semi-automatic mode, which has the disadvantages of low measurement accuracy, poor real-time performance, and poor reliability. Integrated pumping stations can solve the above problems very well. With the advantages of flexibility, short construction time, and convenient installation and maintenance, they have been widely used at home and abroad. With the continuous development of remote intelligent control technology, integrated pumping stations are also developing in the direction of high automation. It is imperative to develop a remote intelligent monitoring system to realize remote data collection and monitoring, which can effectively save costs. In actual engineering situations, the liquid level of the pumping station will change with hydrological and meteorological factors. As the pumping station runs for a period of time, faults such as seal ring wear will occur inside the pump, and the energy consumption of the pumping station will change. Therefore, the energy consumption of pump operation should also be monitored and predicted, and attention should be paid to early maintenance of the pump, which will help save the operating costs of the pump station.

[0003] Multi-sensor information fusion technology is a technology specifically designed for the comprehensive processing of multiple information sources, based on the cross-development of computer hardware and software, artificial intelligence technology, data acquisition and processing methods, and Internet communications. Its basic principle and starting point is to combine the complementary or redundant information of a single dimension measured by multiple sensors into multi-dimensional information from time series and space series, obtain a consistent description or explanation of the observed object, and derive more sufficient information from it to improve the effective performance of the entire system. Its functions mainly include increasing the dimension of the characteristic vector of the target object, optimizing detectability, and enhancing spatiotemporal resolution; enhancing the accuracy and confidence of information; enhancing the system's fault tolerance and adaptability, reducing the ambiguity of reasoning, and making decisions more targeted.

[0004] In the existing public fault diagnosis systems, there are few diagnostic technologies for integrated sewage pumping station faults, and most of them are based on a single sensor information, which can no longer meet the system's needs for accurately judging the blockage failure mode of the integrated sewage pumping station, and there is a high probability of causing misjudgment, false information, omissions, etc. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides an integrated sewage pumping station blockage fault diagnosis method based on multi-sensor information fusion. By monitoring the various characteristic parameter indicators of the integrated sewage pumping station, the fuzzy reasoning weighted fusion method is used to assign values ​​to various factors affecting the diagnosis of blockage faults to calculate a comprehensive evaluation index for judging the blockage situation of the pumping station.

[0006] The present invention achieves the above technical objectives through the following technical means.

[0007] An integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion includes the following steps:

[0008] Collect the current signal of the electrical cabinet; collect the vibration signal of the pipeline intersection of the integrated sewage pump station; collect the air flux signal at the inlet pipe, outlet pipe and check valve respectively; collect the inlet and outlet pressure pulsation signal of the submersible sewage pump; collect the viscosity signal of the fluid medium of the inlet pipe and outlet pipe respectively; collect the temperature signal of the fluid medium and the submersible sewage pump respectively;

[0009] Setting evaluation indicators: The evaluation indicators include the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators; the integrated sewage pump station blockage characteristic indicator D includes the inlet pipe air flux D1, the inlet pipe fluid medium temperature D2, the inlet pipe fluid medium viscosity D3, the outlet pipe air flux D4, the outlet pipe fluid medium temperature D5, the outlet pipe fluid medium viscosity D6, the check valve air flux D7, and the submersible sewage pump temperature D8; the submersible sewage pump characteristic parameter indicator B includes the current characteristic parameter B1, the submersible sewage pump pressure pulsation characteristic parameter B2 and the integrated sewage pump station vibration characteristic parameter B3;

[0010] Determine the corresponding assignment according to the blockage characteristic index of the integrated sewage pump station and the characteristic parameter index of the submersible sewage pump;

[0011] Determine the weight coefficients of the blockage characteristic index of the integrated sewage pumping station and the characteristic parameter index of the submersible sewage pump respectively;

[0012] Whether there is blockage is determined by multiplying the values ​​of the integrated sewage pumping station blockage characteristic index and the submersible sewage pump characteristic parameter index by the sum of the corresponding weight coefficients.

[0013] Furthermore, the variance of the current signal is taken as the current characteristic parameter B1; the standard deviation of the vibration signal at the pipeline intersection is taken as the vibration characteristic parameter B3 of the integrated sewage pumping station; and the information entropy value of the pressure pulsation signal at the inlet and outlet of the submersible sewage pump is taken as the pressure pulsation characteristic parameter B2 of the submersible sewage pump.

[0014] Furthermore, the corresponding values ​​are determined according to the blockage characteristic index of the integrated sewage pumping station, specifically:

[0015] Set three parameters m1, m2 and m3 respectively, and m1 <m2<m3;

[0016] For the inlet pipe air flux D1, outlet pipe air flux D4 and check valve air flux D7: when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is 0, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m1; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is between 0 and 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m2; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is greater than 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m3; where Q is the flow rate under standard conditions of the pump station;

[0017] For the inlet pipe fluid medium temperature D2, the outlet pipe fluid medium temperature D5 and the submersible sewage pump temperature D8: when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is 0℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m1; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is between 0 and 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m2; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is greater than 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m3;

[0018] For the inlet pipe fluid medium viscosity D3 and the outlet pipe fluid medium viscosity D6: when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≤20, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m1; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is between 20 and 100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m2; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≥100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m3.

[0019] Furthermore, the corresponding values ​​are determined according to the characteristic parameter indicators of the submersible sewage pump, specifically:

[0020] For the current characteristic parameter B1: when the current characteristic parameter B1=0, the current characteristic parameter B1 is assigned to m1; when the current characteristic parameter B1∈(0,1], the current characteristic parameter B1 is assigned to m2; when the current characteristic parameter B1>1, the current characteristic parameter B1 is assigned to m3;

[0021] For the pressure pulsation characteristic parameter B2 of the submersible sewage pump: when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is 0, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m1; when the pressure pulsation characteristic parameter B2∈(0,10], the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m2; when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is>10, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m3;

[0022] For the vibration characteristic parameter B3 of the integrated sewage pumping station: when the vibration characteristic parameter B3 of the integrated sewage pumping station is 0, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m1; when the vibration characteristic parameter B3∈(0, 0.05], the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m2; when the vibration characteristic parameter B3 of the integrated sewage pumping station is >0.05, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m3.

[0023] Furthermore, the weight coefficient relationship is determined according to the blockage characteristic index of the integrated sewage pumping station, which is as follows:

[0024] Among them, the weight coefficient of the inlet pipe air flux D1, the weight coefficient of the outlet pipe air flux D4 and the weight coefficient of the check valve air flux D7 are all air flux weight coefficients; the weight coefficient of the inlet pipe fluid medium temperature D2, the weight coefficient of the outlet pipe fluid medium temperature D5 and the weight coefficient of the submersible sewage pump temperature D8 are all medium temperature weight coefficients; the weight coefficient of the inlet pipe fluid medium viscosity D3 and the weight coefficient of the outlet pipe fluid medium viscosity D6 are all medium viscosity weight coefficients; the air flux weight coefficient>medium viscosity weight coefficient>medium temperature weight coefficient.

[0025] Furthermore, the weight coefficient relationship is determined according to the characteristic parameter indicators of the submersible sewage pump, specifically: the weight coefficient of the submersible sewage pump pressure pulsation characteristic parameter B2> the weight coefficient of the current characteristic parameter B1> the weight coefficient of the integrated sewage pump station vibration characteristic parameter B3.

[0026] Furthermore, the air flux weight coefficient is 0.6; the medium viscosity weight coefficient is 0.4; the medium temperature weight coefficient is 0.2; the submersible sewage pump pressure pulsation characteristic parameter B2 weight coefficient is 0.4; the current characteristic parameter B1 weight coefficient is 0.3; the integrated sewage pump station vibration characteristic parameter B3 weight coefficient is 0.2.

[0027] Furthermore, the comprehensive evaluation index S for blockage failure is set by multiplying the values ​​of the integrated sewage pumping station blockage characteristic index and the submersible sewage pump characteristic parameter index by the corresponding weight coefficients. If S<1.5, the integrated sewage pumping station is not blocked or the blockage degree does not affect the operation of the pumping station; if 1.5≤S<2.5, the integrated sewage pumping station is blocked and affects the working efficiency of the pumping station; if 2.5≤S<3.5, the integrated sewage pumping station is seriously blocked and the working efficiency is greatly reduced.

[0028] The beneficial effects of the present invention are:

[0029] 1. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion described in the present invention gives full play to the superiority of multi-sensor information fusion in the field of fault diagnosis, improves the shortcomings of the traditional use of a single physical signal, such as insufficient judgment accuracy and serious information loss, and can achieve efficient and accurate diagnosis of integrated sewage pump station blockage fault modes.

[0030] 2. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion described in the present invention can realize comprehensive evaluation and judgment of the blockage position and blockage degree of the integrated sewage pump station when blockage occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. The drawings described below are some embodiments of the present invention. For ordinary technicians in this field, it is obvious that other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a simplified structural diagram of the integrated sewage pumping station described in the present invention.

[0033] Figure 2 Flow chart of the integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion described in the present invention;

[0034] Figure 3 The collected vibration signal graph;

[0035] Figure 4 It is a characteristic parameter diagram of the current signal;

[0036] In the figure:

[0037] 1-Embossed manhole cover; 2-Ventilation pipe; 3-Electrical cabinet; 4-Gate valve; 5-Ladder; 6-Maintenance platform; 7-Grille; 8-Inlet pipe; 9-Submersible sewage pump; 10-Coupling guide rod; 11-Outlet pipe; 12-Pressure pipeline intersection; 13-Pressure pipeline system; 14-Check valve; 15-Level gauge and protective cover; 16-Float system; 17-Coupling base. DETAILED DESCRIPTION

[0038] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "axial", "radial", "vertical", "horizontal", "inner", "outer" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] like Figure 1 The integrated sewage pumping station comprises a submersible sewage pump 9, an inlet pipe 8, an outlet pipe 11, a ladder 5 and a maintenance platform 6. The structure of the integrated sewage pumping station is prior art and will not be described in detail here.

[0042] like Figure 2As shown, the integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion of the present invention comprises the following steps:

[0043] The current measuring points arranged on the electrical cabinet 3 are used to collect current signals, such as Figure 4 As shown; a vibration measuring point is arranged at the pipeline intersection 12 of the integrated sewage pumping station to collect vibration signals, such as Figure 3 As shown; air sensors are arranged at the inlet pipe 8, the outlet pipe 11 and the check valve 14 respectively, for collecting air flux signals; pressure measuring points are arranged at the inlet and outlet of the submersible sewage pump 9 respectively, for collecting inlet and outlet pressure pulsation signals; viscosity sensors are arranged at the inlet pipe 8 and outlet pipe 11 of the integrated sewage pump station respectively, for collecting inlet and outlet fluid medium viscosity signals; infrared thermometers are arranged at the submersible sewage pump 9, the inlet pipe 8 and the outlet pipe 11 respectively, for obtaining fluid medium and submersible sewage pump temperature signals;

[0044] Setting evaluation indicators: The evaluation indicators include the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators; the integrated sewage pump station blockage characteristic indicator D includes the inlet pipe air flux D1, the inlet pipe fluid medium temperature D2, the inlet pipe fluid medium viscosity D3, the outlet pipe air flux D4, the outlet pipe fluid medium temperature D5, the outlet pipe fluid medium viscosity D6, the check valve air flux D7, and the submersible sewage pump temperature D8; the submersible sewage pump characteristic parameter indicator B includes the current characteristic parameter B1, the submersible sewage pump pressure pulsation characteristic parameter B2 and the integrated sewage pump station vibration characteristic parameter B3;

[0045] Before extracting the features of the collected current signal, a digital filter is used to filter out the interference of the power frequency signal. The specific steps are to convert the original current signal into a digital signal through an analog-to-digital converter, then filter the signal through a digital signal filter, and finally reverse it through a digital-to-analog converter to a current signal after filtering out the power frequency. The amplitude information of the signal is extracted from the time domain perspective of the current, and the variance of the current signal is used as the current characteristic parameter B1.

[0046] The collected vibration signal is subjected to wavelet threshold denoising, and the wavelet threshold denoising comprises the following steps: determining the wavelet basis function and the number of decomposition layers, performing wavelet decomposition on the acquired vibration signal to obtain wavelet coefficients of each layer, then selecting a threshold value and a threshold coefficient, performing threshold denoising on the wavelet coefficients, and finally inversely transforming each wavelet coefficient after denoising to obtain a denoised vibration signal, and taking the standard deviation of the vibration signal as the vibration characteristic parameter B3 of the integrated sewage pumping station;

[0047] Perform frequency domain analysis on the pressure pulsation signal to determine the amplitude and frequency of the interference signal, remove it and restore the normal pressure pulsation signal, and calculate the information entropy value of the pressure pulsation signal. As the pressure pulsation characteristic parameter B2 of the submersible sewage pump.i is the pressure pulsation signal collected for the ith time, and N is the maximum number of collections.

[0048] The various indicators of the integrated sewage pumping station are normalized using the segmented membership function, and the values ​​are assigned as follows: m1, m2, m3, where m3>m2>m1. The relevant indicators are set as follows:

[0049] For the inlet pipe air flux D1, outlet pipe air flux D4 and check valve air flux D7: when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is 0, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m1; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is between 0 and 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m2; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is greater than 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m3; where Q is the flow rate under standard conditions of the pump station;

[0050] For the inlet pipe fluid medium temperature D2, the outlet pipe fluid medium temperature D5 and the submersible sewage pump temperature D8: when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is 0℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m1; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is between 0 and 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m2; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is greater than 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m3;

[0051] For the inlet pipe fluid medium viscosity D3 and the outlet pipe fluid medium viscosity D6: when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≤20, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m1; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is between 20 and 100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m2; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≥100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m3.

[0052] For the current characteristic parameter B1: when the current characteristic parameter B1=0, the current characteristic parameter B1 is assigned to m1; when the current characteristic parameter B1∈(0,1], the current characteristic parameter B1 is assigned to m2; when the current characteristic parameter B1>1, the current characteristic parameter B1 is assigned to m3;

[0053] For the pressure pulsation characteristic parameter B2 of the submersible sewage pump: when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is 0, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m1; when the pressure pulsation characteristic parameter B2∈(0,10], the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m2; when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is>10, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m3;

[0054] For the vibration characteristic parameter B3 of the integrated sewage pumping station: when the vibration characteristic parameter B3 of the integrated sewage pumping station is 0, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m1; when the vibration characteristic parameter B3∈(0, 0.05], the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m2; when the vibration characteristic parameter B3 of the integrated sewage pumping station is >0.05, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m3.

[0055] The weight coefficient relationship is determined based on the blockage characteristic index of the integrated sewage pump station and the characteristic parameter index of the submersible sewage pump, specifically:

[0056] The weight coefficients of the air flux D1 in the inlet pipe, the air flux D4 in the outlet pipe, and the air flux D7 of the check valve are all air flux weight coefficients; the weight coefficients of the fluid medium temperature D2 in the inlet pipe, the fluid medium temperature D5 in the outlet pipe, and the temperature D8 of the submersible sewage pump are all medium temperature weight coefficients; the weight coefficients of the fluid medium viscosity D3 in the inlet pipe and the fluid medium viscosity D6 in the outlet pipe are all medium viscosity weight coefficients; the air flux weight coefficient > the medium viscosity weight coefficient > the medium temperature weight coefficient; the weight coefficient of the pressure pulsation characteristic parameter B2 of the submersible sewage pump > the weight coefficient of the current characteristic parameter B1 > the weight coefficient of the vibration characteristic parameter B3 of the integrated sewage pumping station.

[0057] Multiply the assignment values of the blockage characteristic index of the integrated sewage pumping station and the characteristic parameter index of the submersible sewage pump by the sum of the corresponding weight coefficients to obtain the comprehensive evaluation index S of the blockage fault. If S < 1.5, the integrated sewage pumping station is not blocked or the degree of blockage does not affect the operation of the pumping station; if 1.5 ≤ S < 2.5, the integrated sewage pumping station is blocked and the working efficiency of the pumping station is affected; if 2.5 ≤ S < 3.5, the integrated sewage pumping station is severely blocked and the working efficiency drops significantly.

[0058] Example 1

[0059] The air flux weight coefficient is 0.6; the medium viscosity weight coefficient is 0.4; the medium temperature weight coefficient is 0.2; the weight coefficient of the pressure pulsation characteristic parameter B2 of the submersible sewage pump is 0.4; the weight coefficient of the current characteristic parameter B1 is 0.3; the weight coefficient of the vibration characteristic parameter B3 of the integrated sewage pumping station is 0.2; let m1 = 0, m2 = 0.5, m3 = 1;

[0060] The air flux D1 in the inlet pipe = 3.7m 3 / h, 0 < D1 < 0.1Q, so the assignment value is 0.5; the temperature rise rate of the fluid medium temperature D2 in the inlet pipe ≈ 0 °C / min, the assignment value is 0; the fluid medium viscosity D3 in the inlet pipe = 33, the assignment value is 1; the air flux D4 in the outlet pipe = 27.5m 3 / h, D4 > 0.1Q, the assignment value is 1; the temperature rise rate of the fluid medium temperature D5 in the outlet pipe ≈ 0 °C / min, the assignment value is 0; the fluid medium viscosity D6 in the outlet pipe = 14, the assignment value is 0.5; the air flux D7 of the check valve = 12.2m 3 / h > 0.1Q, the assignment value is 1; the temperature rise rate of the submersible sewage pump temperature D8 = 0.034 °C / min, 0 < D8 < 0.1 °C / min, the assignment value is 0.5; the variance of the current characteristic parameter B1 = 0.078 ∈ (0, 1], the assignment value is 0.5; the pressure pulsation characteristic parameter B2 of the submersible sewage pump is calculated to be 4.275, B2 ∈ (0, 10], the assignment value is 0.5; the vibration characteristic parameter B3 of the integrated sewage pumping station = 0.0678, B3 > 0.05, the assignment value is 1.

[0061] To exclude other faults and the possible impacts on diagnosing the blockage fault of the integrated sewage pump station concurrently, the process of concurrent fault verification includes:

[0062] For other simple fault modes, diagnosis can be achieved only by using single fault characteristic parameters. For example, for mechanical faults such as intense vibration and abnormal sounds, loose bearing bushes, and loose coupling guide rods in similar integrated sewage pump stations, the time-domain and frequency-domain characteristics of vibration signals can be used to clearly distinguish them from normal operating conditions; for hydraulic faults such as gas-liquid two-phase and water injection chemical phenomena, the frequency-domain characteristics of pressure pulsation signals can be used for diagnosis; for electrical faults such as motor overload operation, single-phase operation, leakage, and three-phase output burnout accidents, the time-frequency domain characteristics of current signals are used for identification;

[0063] For faults with multiple faults occurring simultaneously or requiring collaborative diagnosis using multiple signals, it is necessary to optimize the information fusion parameters of vibration, current, and pressure pulsation signals to obtain more complementary or redundant information, and establish a comprehensive evaluation index for diagnostic differentiation:

[0064] The comprehensive evaluation index for the blockage fault of the integrated sewage pump station:

[0065] S = 0.5×0.6 + 0×0.2 + 1×0.4 + 1×0.6 + 0×0.2 + 0.5×0.4 + 1×0.6 + 0.5×0.2 + 0.5×0.3 + 0.5×0.4 + 1×0.2 = 2.65

[0066] Because 2.5 < S < 3.5, the integrated sewage pump station has suffered a serious blockage and its working efficiency has decreased significantly.

[0067] Statistically analyze the rough judgment records, pre-judgment records, detailed records, fault records, and maintenance plans of the integrated sewage pump station when faults occur. Convert the state parameters when blockage faults of different degrees occur into modes that the system can recognize and process, and send them into the signal processing system and input them into the attribute table of the equipment comprehensive information management database established with SQL Server 2008 to establish a fault information diagnosis knowledge base for the integrated sewage pump station, providing empirical knowledge for monitoring and diagnosing sewage pump stations of the same type.

[0068] It should be understood that although this specification is described according to each embodiment, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementation manners that can be understood by those skilled in the art.

[0069] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. An integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion, characterized in that: The steps include: Collecting current signals from the electrical cabinet (3); collecting vibration signals from the pipeline intersection point (12) of the integrated sewage pump station; collecting air flux signals at the inlet pipe (8), outlet pipe (11) and check valve (14); collecting inlet and outlet pressure pulsation signals of the submersible sewage pump (9); collecting viscosity signals of the fluid medium at the inlet pipe (8) and outlet pipe (11); and collecting temperature signals of the fluid medium and the submersible sewage pump (9); Setting evaluation indicators: The evaluation indicators include the integrated sewage pump station blockage characteristic indicators and the submersible sewage pump characteristic parameter indicators; the integrated sewage pump station blockage characteristic indicator D includes the inlet pipe air flux D1, the inlet pipe fluid medium temperature D2, the inlet pipe fluid medium viscosity D3, the outlet pipe air flux D4, the outlet pipe fluid medium temperature D5, the outlet pipe fluid medium viscosity D6, the check valve air flux D7, and the submersible sewage pump temperature D8; the submersible sewage pump characteristic parameter indicator B includes the current characteristic parameter B1, the submersible sewage pump pressure pulsation characteristic parameter B2 and the integrated sewage pump station vibration characteristic parameter B3; Determine the corresponding assignment according to the blockage characteristic index of the integrated sewage pump station and the characteristic parameter index of the submersible sewage pump; Determine the weight coefficients of the blockage characteristic index of the integrated sewage pumping station and the characteristic parameter index of the submersible sewage pump respectively; Whether there is blockage is determined by multiplying the values ​​of the integrated sewage pumping station blockage characteristic index and the submersible sewage pump characteristic parameter index by the sum of the corresponding weight coefficients.

2. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 1 is characterized in that: The variance of the current signal is used as the current characteristic parameter B1; the standard deviation of the vibration signal at the pipeline intersection (12) is used as the vibration characteristic parameter B3 of the integrated sewage pumping station; The information entropy value of the inlet and outlet pressure pulsation signal of the submersible sewage pump (9) is used as the pressure pulsation characteristic parameter B2 of the submersible sewage pump.

3. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 1 is characterized in that: The corresponding values ​​are determined according to the blockage characteristic index of the integrated sewage pumping station, specifically: Set three parameters m1, m2 and m3 respectively, and m1 <m2<m3; For the inlet pipe air flux D1, outlet pipe air flux D4 and check valve air flux D7: when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is 0, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m1; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is between 0 and 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m2; when the air flux of the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is greater than 0.1Q, the inlet pipe air flux D1 or the outlet pipe air flux D4 or the check valve air flux D7 is assigned a value of m3; where Q is the flow rate under standard conditions of the pump station; For the inlet pipe fluid medium temperature D2, the outlet pipe fluid medium temperature D5 and the submersible sewage pump temperature D8: when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is 0℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m1; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is between 0 and 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m2; when the temperature rise rate per unit time of the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is greater than 0.1℃ / min, the inlet pipe fluid medium temperature D2 or the outlet pipe fluid medium temperature D5 or the submersible sewage pump temperature D8 is assigned a value of m3; For the inlet pipe fluid medium viscosity D3 and the outlet pipe fluid medium viscosity D6: when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≤20, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m1; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is between 20 and 100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m2; when the viscosity of the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is ≥100, the inlet pipe fluid medium viscosity D3 or the outlet pipe fluid medium viscosity D6 is assigned a value of m3.

4. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 3 is characterized in that: Determine the corresponding value according to the characteristic parameter index of the submersible sewage pump, specifically: For the current characteristic parameter B1: when the current characteristic parameter B1=0, the current characteristic parameter B1 is assigned to m1; when the current characteristic parameter B1∈(0,1], the current characteristic parameter B1 is assigned to m2; when the current characteristic parameter B1>1, the current characteristic parameter B1 is assigned to m3; For the pressure pulsation characteristic parameter B2 of the submersible sewage pump: when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is 0, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m1; when the pressure pulsation characteristic parameter B2∈(0,10], the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m2; when the pressure pulsation characteristic parameter B2 of the submersible sewage pump is>10, the pressure pulsation characteristic parameter B2 of the submersible sewage pump is assigned to m3; For the vibration characteristic parameter B3 of the integrated sewage pumping station: when the vibration characteristic parameter B3 of the integrated sewage pumping station is 0, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m1; when the vibration characteristic parameter B3∈(0, 0.05], the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m2; when the vibration characteristic parameter B3 of the integrated sewage pumping station is >0.05, the vibration characteristic parameter B3 of the integrated sewage pumping station is assigned to m3.

5. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 1 is characterized in that: The weight coefficient relationship is determined according to the blockage characteristic index of the integrated sewage pumping station, specifically: Among them, the weight coefficient of the inlet pipe air flux D1, the weight coefficient of the outlet pipe air flux D4 and the weight coefficient of the check valve air flux D7 are all air flux weight coefficients; the weight coefficient of the inlet pipe fluid medium temperature D2, the weight coefficient of the outlet pipe fluid medium temperature D5 and the weight coefficient of the submersible sewage pump temperature D8 are all medium temperature weight coefficients; the weight coefficient of the inlet pipe fluid medium viscosity D3 and the weight coefficient of the outlet pipe fluid medium viscosity D6 are all medium viscosity weight coefficients; the air flux weight coefficient>medium viscosity weight coefficient>medium temperature weight coefficient.

6. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 5 is characterized in that: The weight coefficient relationship is determined according to the characteristic parameter indicators of the submersible sewage pump, specifically: the weight coefficient of the submersible sewage pump pressure pulsation characteristic parameter B2> the weight coefficient of the current characteristic parameter B1> the weight coefficient of the integrated sewage pump station vibration characteristic parameter B3.

7. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to any one of claims 5-6 is characterized in that: The weight coefficient of air flux is 0.6; the weight coefficient of medium viscosity is 0.4; the weight coefficient of medium temperature is 0.2; the weight coefficient of submersible sewage pump pressure pulsation characteristic parameter B2 is 0.4; The weight coefficient of the current characteristic parameter B1 is 0.3; the weight coefficient of the integrated sewage pumping station vibration characteristic parameter B3 is 0.

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8. The integrated sewage pump station blockage fault diagnosis method based on multi-sensor information fusion according to claim 1 is characterized in that: The comprehensive evaluation index S for blockage failure is set by multiplying the values ​​of the integrated sewage pumping station blockage characteristic index and the submersible sewage pump characteristic parameter index by the corresponding weight coefficient. If S<1.5, the integrated sewage pumping station is not blocked or the degree of blockage does not affect the operation of the pumping station; if 1.5≤S<2.5, the integrated sewage pumping station is blocked and affects the working efficiency of the pumping station; if 2.5≤S<3.5, the integrated sewage pumping station is seriously blocked and the working efficiency is greatly reduced.

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