CN121408232A - A method and system for testing the seals of submersible sewage pumps based on coupling interface state recognition - Google Patents
A method and system for testing the seals of submersible sewage pumps based on coupling interface state recognitionInfo
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Abstract
本发明提供了一种基于耦合界面状态识别的潜污泵密封测试方法及系统，涉及机械密封性能测试技术领域。该方法通过在潜污泵进水侧设置扰动施加单元，施加扰动激发耦合界面产生与密封状态相关的响应变化，在响应数据采集装置安装在进水处靠近耦合端，实时采集与密封性相关的响应数据，并生成响应变化曲线，基于曲线提取多维度响应特征，并将耦合界面划分为紧密贴合、局部间隙和松动三类状态，确定每个状态对应的响应特征范围，通过响应特征与响应特征范围进行比对，准确识别耦合界面的当前密封状态。本发明能够实现潜污泵密封状态的实时监控和早期预警，有效避免传统方法中的误判和漏检问题，提高检测精度和效率，降低了潜污泵的维护成本。
This invention provides a method and system for testing the sealing of submersible sewage pumps based on coupling interface state recognition, belonging to the field of mechanical seal performance testing technology. The method involves setting a disturbance application unit on the inlet side of the submersible sewage pump to apply disturbance and excite response changes at the coupling interface related to the sealing state. A response data acquisition device is installed near the coupling end at the inlet to collect response data related to sealing performance in real time and generate response change curves. Based on the curves, multi-dimensional response features are extracted, and the coupling interface is divided into three states: tight fit, local gap, and looseness. The response feature range corresponding to each state is determined, and the current sealing state of the coupling interface is accurately identified by comparing the response features with the response feature range. This invention enables real-time monitoring and early warning of the sealing state of submersible sewage pumps, effectively avoiding misjudgment and missed detection problems in traditional methods, improving detection accuracy and efficiency, and reducing the maintenance cost of submersible sewage pumps.
Description
Technical Field
The invention relates to the technical field of mechanical sealing performance test, in particular to a submersible sewage pump sealing test method and system based on coupling interface state identification.
Background
With the wide application of pump-like devices in industrial and municipal environments, submersible sewage pumps play a vital role in sewage treatment, drainage systems, and other liquid delivery systems. In order to ensure the normal operation of the submersible sewage pump and prolong the service life of the submersible sewage pump, the monitoring and evaluation of the sealing performance become key links. At present, the detection of the tightness of the submersible sewage pump mainly depends on the following several prior technologies:
the vibration and temperature monitoring method is to install sensors in different parts of the submersible sewage pump to monitor vibration and temperature change of the pump body to judge the sealing performance. These signals are typically associated with the operating state of the device, but are affected by noise inside the device and do not directly reflect the sealing state at the coupling interface, and therefore are less accurate and sensitive.
The sealing performance of the submersible sewage pump is evaluated by monitoring pressure fluctuation or change of the submersible sewage pump in the running process based on a pressure change monitoring method. While pressure changes may indicate potential seal failure, relying solely on pressure changes is not sufficient to accurately determine the specific state of the seal interface.
The acoustic detection method is used for judging the running state of the submersible sewage pump by detecting acoustic signals generated by the pump body and the coupling interface. Although acoustic signals provide some hermeticity cues, the accuracy of acoustic methods is greatly affected by differences in acoustic propagation characteristics between noisy environments and devices.
Therefore, the prior art cannot provide sufficiently accurate sealing performance evaluation in a complex environment, and is difficult to realize omnibearing and multidimensional state identification.
Disclosure of Invention
Aiming at the problems, the invention provides a submersible sewage pump sealing test method and a submersible sewage pump sealing test system based on coupling interface state identification, which excite a coupling interface to generate response change related to the sealing state by applying disturbance on the water inlet side of the submersible sewage pump, and response data are acquired, and the current sealing state of the coupling interface is judged by comparing the response characteristics of the coupling interface with the standard response characteristic range, so that the limitation in the prior art is avoided, and the omnibearing and multidimensional tightness evaluation can be provided.
In order to achieve the above object, in a first aspect, the present invention provides a submersible sewage pump seal test method based on coupling interface state recognition, comprising the steps of,
A disturbance applying unit is arranged on the water inlet side of the submersible sewage pump, disturbance for exciting interface response is applied to the coupling interface, and response change related to interface state is generated on the coupling interface;
A response data acquisition device is arranged at the water inlet of the submersible sewage pump and close to the coupling end, response data related to the tightness of the coupling interface are acquired by the response data acquisition device in the disturbance applying process, and a response change curve is calculated based on the acquired response data;
Acquiring response characteristics for reflecting the state of the coupling interface based on the response change curve, wherein the response characteristics comprise amplitude characteristics, fluctuation characteristics, steady-state time characteristics and attenuation characteristics;
Dividing the coupling interface into a close fitting state, a local clearance state and a loosening state, and determining a response characteristic range corresponding to each type of state as a judging basis for the state identification of the coupling interface;
Comparing the obtained response characteristics with response characteristic ranges corresponding to each type of state, and identifying the current state of the coupling interface;
and determining a sealing performance evaluation result of the coupling interface according to the current state of the coupling interface.
In order to achieve the above object, another aspect of the present invention provides a submersible sewage pump seal test system based on coupling interface state recognition, which specifically includes,
The disturbance applying module is used for applying disturbance on the water inlet side of the submersible sewage pump, and applying disturbance for exciting interface response to the coupling interface so that the coupling interface generates corresponding change with the interface state;
the response data acquisition module is used for acquiring response data related to the tightness of the coupling interface in the process of applying disturbance and calculating a response change curve based on the acquired response data;
The response characteristic acquisition module is used for acquiring response characteristics for reflecting the state of the coupling interface based on the response change curve, wherein the response characteristics comprise amplitude characteristics, fluctuation characteristics, steady-state time characteristics and attenuation characteristics;
The state judging basis module is used for dividing the coupling interface into a close fitting state, a local clearance state and a loosening state, determining a response characteristic range corresponding to each type of state, and taking the response characteristic range as a judging basis for the state identification of the coupling interface;
the state identification module is used for comparing the acquired response characteristics with response characteristic ranges corresponding to each type of state and identifying the current state of the coupling interface;
And the evaluation module is used for determining the sealing performance evaluation result of the coupling interface according to the current state of the coupling interface.
The technical scheme provided by the invention has at least the following technical effects or advantages that the sealing performance of the submersible sewage pump can be monitored in real time by the submersible sewage pump sealing test method based on the coupling interface state identification, the sealing state of the coupling interface can be accurately identified, and the limitations of the traditional detection method are avoided. The method comprises the steps of applying disturbance on a water inlet side of a submersible sewage pump, exciting a coupling interface to generate response change, enabling the coupling interface to respond more sensitively and accurately to the change of the sealing state, collecting response data related to the sealing performance of the coupling interface in real time through arrangement of a response data collecting device at the water inlet position of the submersible sewage pump, generating a response change curve, providing reliable real-time data for sealing performance evaluation, acquiring amplitude characteristics, fluctuation characteristics, steady-state time characteristics and attenuation characteristics for reflecting the state of the coupling interface based on the response change curve, comprehensively reflecting the sealing state of the coupling interface through the response characteristics of multiple dimensions, dividing the coupling interface into a close fitting state, a local clearance state and a loosening state, setting a corresponding response characteristic range for each type of state, providing a powerful basis for accurate identification of the sealing state through setting a standard response characteristic range, comparing the obtained response characteristic with the response characteristic range corresponding to each type of state, enabling accurate identification of the current sealing state of the coupling interface, guaranteeing accurate and reliable evaluation results of the sealing performance, and finally, reflecting the sealing state of the submersible sewage pump in time and providing scientific maintenance basis for the follow-up sealing state. Compared with the prior art, the technical scheme of the invention breaks through the limitation of the traditional detection method, realizes the omnibearing monitoring of the state of the coupling interface, can discover potential leakage risks in time through accurate state identification, provides reliable data support for real-time operation and fault early warning of the submersible sewage pump, and obviously reduces the fault rate and maintenance cost of equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments, which are merely examples of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a submersible sewage pump seal test method based on coupling interface state identification provided by an embodiment of the application;
FIG. 2 is a schematic structural diagram of a submersible sewage pump seal test system based on coupling interface state identification according to an embodiment of the present application;
Reference numerals indicate that the disturbance applying module 11, the response data acquiring module 12, the response characteristic acquiring module 13, the state judging and judging module 14, the state identifying module 15 and the evaluating module 16.
Detailed Description
According to the submersible sewage pump sealing test method based on the coupling interface state recognition, the coupling interface state recognition mechanism and the multidimensional response characteristic analysis are introduced, the coupling interface response data are collected and analyzed in real time, so that the sealing state change can be accurately recognized, a more reliable and efficient sealing performance evaluation scheme is provided, the operation safety and reliability of the submersible sewage pump are improved, and meanwhile, the maintenance cost is reduced.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, the terms "first," "second," and the like in the description of the present application and the above drawings are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, platform, article, or server that comprises a list of steps or elements is not necessarily limited to those steps or elements that are expressly listed or inherent to such process, method, article, or apparatus, but may include other steps or modules not expressly listed.
In a first embodiment, as shown in fig. 1, a submersible sewage pump seal testing method based on coupling interface state identification includes the following steps,
S1, arranging a disturbance applying unit at the water inlet of the submersible sewage pump and close to the coupling end to enable the coupling interface to generate response change related to the interface state,
Specifically, a disturbance applying unit is arranged at the water inlet of the submersible sewage pump and close to the coupling end, and is connected to an operation control system of the submersible sewage pump, the operation control system of the submersible sewage pump at least comprises an operation data processing unit for collecting and processing data capacity, a communication module for realizing data transmission and an output unit for feedback, the operation control system of the submersible sewage pump controls the disturbance applying unit to apply disturbance for exciting interface response to a coupling interface with preset disturbance parameters, so that the coupling interface generates observable response change in a short time, the application disturbance mode can adopt a pressure change disturbance, a flow pulse disturbance application mode or a water head abrupt change disturbance application mode, the transient response differences caused by various disturbances can reflect the interface state differences in a pressure change curve and a flow change curve, the disturbance application can lead the coupling interface to show response changes directly related to the interface state under different external conditions, an available data basis is provided for the subsequent collection of response data and the identification interface state,
The pressure change disturbance applying mode is that a water source with adjustable pressure is arranged on the water inlet side of the submersible sewage pump, the operation control system of the submersible sewage pump adjusts the pressure of the water source according to preset pressure change parameters, so that the pressure in a channel where a coupling interface is positioned changes within a set range, the pressure adjustment adopts a stepped boosting or reducing mode, so that the response difference of the coupling interface under different pressures is excited,
The application mode of flow pulse disturbance is that a controllable switch is arranged in a water supply flow path of the submersible sewage pump, the controllable switch is controlled to be turned on or off by an operation control system of the submersible sewage pump, so that flow pulses are formed in a short time by water flow, the coupling interface is subjected to transient load by pulse flow, thereby inducing flow response change related to the fitting tightness degree of the coupling interface,
The method comprises the steps of adjusting the operation working condition of the submersible sewage pump through an operation control system of the submersible sewage pump, changing the water head condition in a short time to form water head mutation, enabling a coupling interface to bear transient water head difference, and enabling pressure and flow at the interface to simultaneously respond to change due to water head mutation.
S2, arranging a response data acquisition device at the water inlet of the submersible sewage pump and close to the coupling end, acquiring response data related to the tightness of the coupling interface by the response data acquisition device in the disturbance applying process, calculating a response change curve based on the acquired response data,
Specifically, a response data acquisition device is arranged at the water inlet of the submersible sewage pump and close to the coupling end, the response data acquisition device can be a pressure sensor or a flowmeter, the operation control system of the submersible sewage pump coordinates and triggers the operation of the response data acquisition device while disturbance is applied to the coupling interface, a pressure value sequence of a pressure measuring point at the water inlet of the submersible sewage pump or a flow value sequence of a flow measuring point at the water inlet of the submersible sewage pump is recorded and used as response data reflecting the tightness of the coupling interface, after the acquisition is completed, the acquired data are arranged in time to generate a response change curve for representing the response change process along with time,
Further, the response profile is a pressure profile or a flow rate profile, wherein,
The method comprises the steps that a pressure change curve is obtained through the change of pressure at an inlet of a submersible sewage pump along with time, specifically, a pressure measuring point is arranged at a position, close to a coupling end, of a water inlet of the submersible sewage pump, the position of the pressure measuring point is 1-3 times of the pipe diameter from the coupling end, the pressure sensor is arranged at the position of the pressure measuring point, a running control system of the submersible sewage pump synchronously triggers pressure data acquisition in a disturbance application process, the change of the pressure along with time is recorded in real time in the disturbance application process, the sampling frequency is set to be 50-200 Hz, a pressure value sequence { P (t 0),P(t1),…,P(tn) } which is arranged in time sequence is obtained, wherein P is a pressure value acquired at a corresponding time point t, t is a corresponding time point in the disturbance process, and a pressure change curve for reflecting the pressure change process is generated based on the pressure value sequence;
The flow change curve is obtained by monitoring the change of the flow at the inlet of the submersible sewage pump along with time through a flow meter, specifically, a flow measuring point is arranged at the position, close to a coupling end, of the water inlet of the submersible sewage pump, the position of the flow measuring point is 1-3 times of the pipe diameter from the coupling end, the flow meter is arranged at the flow measuring point, a flow data acquisition is synchronously triggered by an operation control system of the submersible sewage pump in the disturbance application process, the change of the flow along with time is recorded in real time in the disturbance application process, the sampling frequency is set to 20-100 Hz, a flow value sequence { Q (t 0),Q(t1),…,Q(tn) } which is arranged in time sequence is obtained, wherein Q is a flow value acquired at a corresponding time point t, t is a corresponding time point in the disturbance process, and the flow change curve for reflecting the flow change process is generated based on the flow value sequence.
S3, obtaining response characteristics for reflecting the state of the coupling interface based on the response change curve, wherein the response characteristics comprise amplitude characteristics, fluctuation characteristics, steady-state time characteristics and attenuation characteristics,
Specifically, after the response change curve is generated, the response change curve is processed by an operation control system of the submersible sewage pump, response characteristics for reflecting the state of the coupling interface are extracted from the response change curve, wherein the amplitude characteristics are determined based on the amplitude change of the pressure change curve or the flow change curve, the fluctuation characteristics are determined based on the fluctuation degree of the pressure change curve or the flow change curve, the steady-state time characteristics are determined based on the time required for the pressure change curve or the flow change curve to reach steady state, the attenuation characteristics are determined based on the attenuation process of the pressure change curve or the flow change curve,
Further, the acquisition of the amplitude characteristic, the fluctuation characteristic, the steady-state time characteristic and the attenuation characteristic specifically comprises,
S300, obtaining amplitude characteristics by analyzing the maximum fluctuation amplitude of the response change curve relative to the average value of the response value sequence in the stable stage before disturbance, for reflecting the maximum response intensity caused by disturbance,
Firstly, collecting a pressure value sequence or a flow value sequence in a period of time in a stable stage without disturbance, calculating an average value of the sequence to be used as an average value of a stable stage response value sequence before disturbance, then, calculating an absolute value of a difference value between a response value of each collection moment and the average value of the stable stage response value sequence before disturbance according to the collected pressure value sequence or the flow value sequence in a disturbance application process to obtain a fluctuation amplitude sequence for representing the instantaneous fluctuation degree of disturbance, and finally, selecting the maximum value in the fluctuation amplitude sequence to be used as an amplitude characteristic to reflect the maximum response intensity caused by disturbance;
s301, obtaining fluctuation characteristics by analyzing the overall fluctuation degree of the response change curve relative to the average value of the response value sequence in the stable stage before disturbance, which is used for reflecting the overall fluctuation condition of the response process,
Specifically, in the disturbance applying process, calculating the difference value between the response value of each acquisition time relative to the average value of the response value sequence in the stable stage before disturbance according to the acquired pressure value sequence or flow value sequence, summing the squares of the difference values, averaging and dividing the squares to obtain a fluctuation metric value for representing the overall fluctuation degree, and taking the fluctuation metric value as a fluctuation characteristic for reflecting the overall fluctuation condition of the response process;
s302, obtaining a steady-state time characteristic by determining the time from the time point when the response change curve deviates from the average value of the response value sequence of the steady-state stage before disturbance to the time when the response change curve returns to the preset fluctuation range and keeps steady, limiting the time required for the response to return to steady after the disturbance is ended,
Then, in the disturbance application process, according to the pressure value sequence or flow value sequence obtained by acquisition, calculating the absolute value of the difference value of the response value of each acquisition time relative to the average value of the response value sequence of the stable stage before disturbance, obtaining a fluctuation amplitude sequence used for representing the instantaneous fluctuation degree of disturbance, when the fluctuation amplitude is continuously in the preset fluctuation amplitude range, judging that the response is restored to the stable state, then, recording the time point of the pressure change curve or the flow change curve which is reentered and kept in the preset fluctuation amplitude range as T s as the moment of restoring the stable state, finally, calculating the time difference between T s and T 0, obtaining a stable time characteristic T for limiting the time required for restoring the response to the stable state after the disturbance is ended, wherein the preset fluctuation amplitude range is determined according to the natural fluctuation condition of the stable stage before disturbance, particularly, acquiring the response value sequence in the stable stage before disturbance, calculating the response value sequence in a period of time when the fluctuation amplitude is continuously in the preset fluctuation amplitude range, and calculating the maximum fluctuation amplitude delta of the response value of the stable stage before disturbance is set to be the stable state, and setting the maximum fluctuation amplitude delta is 1, wherein the stable amplitude is 1, and the stable amplitude can be repeatedly set to be 1, and the stable amplitude can be ensured, and the stability is also can be ensured, and the stable amplitude is set to be stable and can be 1;
S303, obtaining attenuation characteristics by determining the time from the maximum fluctuation amplitude of the response change curve relative to the average value of the response value sequence in the stable stage before disturbance to the fluctuation range corresponding to the preset proportion, wherein the time is used for representing the speed of weakening response deviation along with time,
Specifically, first, the maximum fluctuation amplitude Δp of the response change curve with respect to the average value of the pre-disturbance steady-state response value sequence is obtained while taking the point in time at which the maximum fluctuation amplitude occurs as the start time of the attenuation analysis, denoted as t p, and then, during the disturbance application, the fluctuation amplitude of the response value at each acquisition time with respect to the average value of the pre-disturbance steady-state response value sequence is calculated from the acquired pressure value sequence or flow value sequence, and the point in time at which the fluctuation amplitude falls into and remains at the upper limit value of the attenuation target deviation range for the first time is denoted asAs the time when the preset attenuation proportion is reached, finally, calculating the time when the preset attenuation proportion is reachedThe time difference between the time t p and the starting time of the attenuation analysis, to obtain the attenuation characteristicThe method is used for representing the speed of weakening response fluctuation along with time, wherein the upper limit value of the fluctuation range of the attenuation target is determined according to the product of a preset attenuation proportion r and the maximum fluctuation amplitude deltap of the response change curve relative to the average value of the response value sequence of the stable phase before disturbance, and is recorded as r multiplied by deltap, the attenuation proportion r is determined according to the natural fluctuation level of the stable phase before disturbance, specifically, the ratio of the maximum fluctuation amplitude deltamax of the response value sequence relative to the average value of the sequence in the stable phase without disturbance to the maximum fluctuation amplitude deltap of the response change curve relative to the average value of the response value sequence of the stable phase before disturbance is set as the attenuation proportion r, and r=deltamax/deltap, so that the attenuation target can reflect the actual change degree of the attenuation process and erroneous judgment caused by steady-state noise or tiny fluctuation is avoided.
S4, dividing the coupling interface into a close fitting state, a local clearance state and a loose state, determining a response characteristic range corresponding to each type of state as a judging basis for the state identification of the coupling interface,
Specifically, the coupling interface is divided into a close fitting state, a local clearance state and a loosening state according to the calibrated maximum allowable clearance and minimum allowable sealing pressure at the coupling interface, the values of response characteristics corresponding to each type of state are counted through a plurality of disturbance experiments under each state of the coupling interface, the values of response characteristics including the values of amplitude characteristics, the values of fluctuation characteristic ranges, the values of steady-state time characteristics and the values of attenuation characteristics are counted, the amplitude characteristic ranges, the fluctuation characteristic ranges, the steady-state time characteristic ranges and the attenuation characteristic ranges corresponding to the close fitting state are respectively determined according to the ranges of the values of the response characteristics corresponding to the three states, the amplitude characteristic ranges, the fluctuation characteristic ranges, the steady-state time characteristic ranges and the attenuation characteristic ranges corresponding to the local clearance state, the amplitude characteristic ranges, the fluctuation characteristic ranges, the steady-state time characteristic ranges and the attenuation characteristic ranges corresponding to the loosening state are stored in a database associated with the operation control process of the submersible pump so as to be called in the subsequent coupling interface state identification as a judging basis.
Further, the coupling interface is divided into a close fitting state, a partial gap state and a loose state, specifically including,
Dividing the coupling interface into a close fitting state and a non-close fitting state according to the maximum allowable gap marked at the coupling interface,
Specifically, by acquiring the design tolerance range of the sealing element designed by the submersible sewage pump and the shell, the maximum allowable gap at the coupling interface can be determined, the data can be directly obtained through product design parameters, the maximum allowable gap determined by the sealing element manufacturing and assembling process is known by the industry accepted sealing element design principle, and is a critical assembling gap value for ensuring that the sealing element is kept in effective contact with the shell and the sealing performance is maintained, so the critical assembling gap value can be used as a basis for judging whether the coupling interface is tightly attached or not, so the assembling state that the assembled gap at the coupling interface is smaller than or equal to the maximum allowable gap is set as the tightly attached state of the coupling interface, and the assembling state that is larger than the maximum allowable gap is set as the non-tightly attached state of the coupling interface;
the non-close fitting condition is further divided into a partial gap condition and a loose condition according to a minimum allowable sealing pressure calibrated at the coupling interface,
Specifically, whether the submersible sewage pump is still in a sealed state can not pass through the calibrated clearance parameter of the product as a reference quantity is judged, but the nominal minimum sealing pressure calibrated by the sealing element designed by the product and the shell can be taken as the reference quantity, the nominal minimum sealing pressure calibrated by the sealing element designed by the submersible sewage pump and the shell can be obtained, the minimum allowable sealing pressure at the coupling interface can be determined, the data can be directly obtained through the product design parameter, the nominal minimum sealing pressure corresponds to the critical contact pressure value required by the sealing element to realize effective sealing at the coupling interface as known by the design principle of the sealing element recognized in the industry, and above the critical pressure, the sealing element can maintain enough contact stress to prevent medium from penetrating or leaking, so the method can be used as the judging basis for judging whether the coupling interface is in a loose state when the coupling interface is in a non-tight fit state, the contact pressure born at the coupling interface is less than or equal to the minimum allowable sealing pressure assembly state is set as the local clearance state of the coupling interface, and the assembly state greater than the minimum allowable sealing pressure is set as the loose state of the coupling interface.
Further, a response characteristic range corresponding to each type of state is determined, and the response characteristic range specifically comprises,
Counting the values of each response characteristic obtained by the multiple disturbance experiments in the close fitting state, determining the minimum value and the maximum value of each response characteristic as the response characteristic range corresponding to the close fitting state,
Specifically, a plurality of submersible sewage pumps with the same specification are adopted as experimental samples, disturbance experiments are carried out under standard working conditions, gaps between a compression surface of a sealing gasket and a shell plane are adjusted by adjusting the assembly amount of a sealing piece for each experimental sample, gap measuring tools such as a feeler gauge, a three-coordinate measuring instrument or a laser measuring instrument are adopted during adjustment, gaps between the two are repeatedly measured until the gaps between the two are in a maximum allowable gap at a coupling interface, at the moment, the experiment is carried out with the coupling interface of each sample in a critical state of close fit, multiple disturbance experiments are carried out on each experimental sample, pressure or flow response data before disturbance and in the disturbance process in the disturbance experiments are collected, response characteristic data of each experiment are obtained through calculation, amplitude characteristics, fluctuation characteristics, steady-state time characteristics and minimum and maximum values of attenuation characteristics obtained through all experimental samples and multiple experiments are counted, and the intervals corresponding to the characteristics are organized as response characteristic ranges corresponding to the close fit states, namely, the amplitude characteristic ranges corresponding to the close fit states are [ A_min1, A_max1], the amplitude characteristic ranges corresponding to the close fit states are [ F_min 1], and the amplitude characteristic ranges corresponding to the fluctuation ranges corresponding to the close fit states [ W_min 1] are [ W_min 1] and the steady-state damping characteristic ranges corresponding to W_min 1] and the response characteristic ranges corresponding to W_max 1.
Counting the values of each response characteristic obtained by the multiple disturbance experiments of the local gap state, and determining the minimum value and the maximum value of each response characteristic as a response characteristic range corresponding to the local gap state;
Specifically, the bolts are assembled on the coupling interface in a test prototype, the actual axial load and the interface compaction effect of the bolts under different torques are obtained, the bolt axial load corresponding to the coupling interface compaction pressure reaching the minimum allowable sealing pressure is determined, the bolt assembly torque value corresponding to the minimum allowable sealing pressure at the coupling interface is obtained by recording the bolt tightening torque corresponding to the axial load, a plurality of submersible sewage pumps with the same specification are adopted as test samples, a disturbance test is carried out under standard working conditions, the torque of each test sample is adjusted to reach the bolt assembly torque value corresponding to the minimum allowable sealing pressure at the coupling interface, at the moment, the coupling interface of each test sample is in a critical state of a local clearance state, a plurality of disturbance tests are carried out on each test sample, pressure or flow response data before disturbance and in the disturbance process are collected, response characteristic data of each test are calculated, the amplitude characteristics, the fluctuation characteristics, the minimum values and the maximum values of steady state time characteristics and the attenuation characteristics of all test samples and the amplitude characteristics obtained by the plurality of the test samples are counted, and the amplitude characteristics, the minimum values and the maximum values of the steady state time characteristics are organized into sections corresponding to each characteristic response states, namely the local clearance states are used as the local response ranges, namely the local clearance states: the amplitude characteristic range corresponding to the local gap state is [ A_min2, A_max2], the fluctuation characteristic range corresponding to the local gap state is [ F_min2, F_max2], the steady-state time characteristic range corresponding to the local gap state is [ W_m2, W_max2], and the attenuation characteristic range corresponding to the local gap state is [ D_m2, D_max2].
A characteristic value interval larger than the upper limit value of the response characteristic range corresponding to the local clearance state is determined as the response characteristic range corresponding to the loosening state,
Specifically, the upper limit value of the response characteristic range corresponding to the local clearance state is data obtained according to an experimental sample assembled according to a bolt assembly torque value corresponding to the minimum allowable sealing pressure at the coupling interface, and the minimum allowable sealing pressure at the coupling interface corresponds to a critical contact pressure value required by the sealing element to realize effective sealing at the coupling interface, so that the upper limit value of the response characteristic range corresponding to the local clearance state can be selected as a reference, the response characteristic range corresponding to the loosening state is determined, specifically, the upper limit value of the amplitude characteristic range corresponding to the local clearance state, the upper limit value of the fluctuation characteristic range, the upper limit value of the steady-state time characteristic range and the upper limit value of the attenuation characteristic range are respectively used as the amplitude characteristic range corresponding to the loosening state, the fluctuation characteristic range, the steady-state time characteristic range and the attenuation characteristic range, namely, the amplitude characteristic range corresponding to the loosening state is (A_max2, -), the fluctuation characteristic range corresponding to the loosening state is (F_max2, -), the steady-state time characteristic range corresponding to the loosening state is (W_max2, -), and the attenuation characteristic range corresponding to the loosening state is (D_maχ2, -).
S5, comparing the obtained response characteristic with a response characteristic range corresponding to each type of state, identifying the current state of the coupling interface,
Further, identifying the current state of the coupling interface specifically includes,
If all the acquired data of the amplitude characteristic, the fluctuation characteristic, the steady-state time characteristic and the attenuation characteristic fall into the response characteristic range corresponding to the close fitting state corresponding to each characteristic, judging that the coupling interface is in the close fitting state;
if at least one item of data of the acquired amplitude characteristic, fluctuation characteristic, steady-state time characteristic and attenuation characteristic does not fall into a response characteristic range corresponding to the close fitting state corresponding to each characteristic, and all the data do not exceed a response characteristic range corresponding to the local clearance state corresponding to each characteristic, judging that the coupling interface is in the local clearance state;
If any item of data of the acquired amplitude characteristic, fluctuation characteristic, steady-state time characteristic and attenuation characteristic falls into a response characteristic range corresponding to the loosening state corresponding to each characteristic, the coupling interface is judged to be in the loosening state.
Specifically, based on the amplitude characteristic, the fluctuation characteristic, the steady-state time characteristic and the attenuation characteristic when disturbance for exciting the interface response is applied to the coupling interface, and the data stored in the response characteristic range corresponding to each type of state in the database related to the submersible pump operation control process are called, the amplitude characteristic is compared with the amplitude characteristic range corresponding to each type of state, the fluctuation characteristic is compared with the fluctuation characteristic range corresponding to each type of state, the steady-state time characteristic is compared with the steady-state time characteristic range corresponding to each type of state, the attenuation characteristic is compared with the attenuation characteristic range corresponding to each type of state, when the acquired amplitude characteristic, the fluctuation characteristic, the steady-state time characteristic and the attenuation characteristic respectively fall into the amplitude characteristic range, the fluctuation characteristic range, the steady-state time characteristic range and the attenuation characteristic range corresponding to the close fit state, the coupling interface can be judged, when at least one of the acquired amplitude characteristic, the fluctuation characteristic, the steady-state time characteristic and the attenuation characteristic does not fall into the amplitude characteristic range, the fluctuation characteristic range, the steady-state time characteristic range or the attenuation characteristic range corresponding to the close fit state, and the amplitude characteristic can be judged, and the attenuation characteristic can be judged when all the acquired characteristic data do not fall into the amplitude characteristic range, the fluctuation characteristic range, the steady-state time characteristic and the attenuation characteristic fall into the amplitude characteristic range corresponding to the close fit state, the fluctuation characteristic and the attenuation characteristic range are judged, and the amplitude characteristic is in any amplitude-state coupling characteristic and the amplitude characteristic and the attenuation characteristic range, and finally, recording the judging result into a database associated with the submersible sewage pump operation control process.
S6, determining the sealing performance evaluation result of the coupling interface according to the current state of the coupling interface,
The operation control system of the submersible sewage pump can trigger corresponding output feedback according to the evaluation result of the sealing performance, wherein the operation control system comprises a coupling interface, a coupling interface and a submersible sewage pump, wherein the coupling interface is in a close fit state, the sealing performance in the state is judged to be qualified, the coupling interface has an expected sealing effect and can effectively prevent leakage if the coupling interface is in a local clearance state, the sealing performance in the state is judged to be checked and can still be used for a certain period of time if the coupling interface is in a loose state, the sealing performance in the state is judged to be unqualified if the coupling interface is in a loose state, the sealing performance is judged to be invalid, the sealing performance is in a large leakage risk, repair measures are needed to be immediately adopted or related sealing elements are replaced, and the operation control system of the submersible sewage pump can trigger corresponding output feedback according to the evaluation result of the sealing performance.
In the second embodiment, based on the same inventive concept as the submersible sewage pump seal test method based on the coupling interface state recognition in the previous embodiment, as shown in fig. 2, the present application provides a submersible sewage pump seal test system based on the coupling interface state recognition, and the system and the method in the embodiment of the present application are based on the same inventive concept. Wherein the system comprises:
the disturbance applying module is used for applying disturbance on the water inlet side of the submersible sewage pump, and applying disturbance for exciting interface response to the coupling interface so that the coupling interface generates corresponding change with the interface state;
the response data acquisition module is used for acquiring response data related to the tightness of the coupling interface in the process of applying disturbance and calculating a response change curve based on the acquired response data;
The response characteristic acquisition module is used for acquiring response characteristics for reflecting the state of the coupling interface based on the response change curve, wherein the response characteristics comprise amplitude characteristics, fluctuation characteristics, steady-state time characteristics and attenuation characteristics;
The state judging basis module is used for dividing the coupling interface into a close fitting state, a local clearance state and a loosening state, determining a response characteristic range corresponding to each type of state, and taking the response characteristic range as a judging basis for the state identification of the coupling interface;
the state identification module is used for comparing the acquired response characteristics with response characteristic ranges corresponding to each type of state and identifying the current state of the coupling interface;
And the evaluation module is used for determining the sealing performance evaluation result of the coupling interface according to the current state of the coupling interface.
Although the present application makes various references to certain modules in a system according to an embodiment of the present application, any number of different modules may be used and run on a user terminal and/or a server, and each unit and module included are merely divided according to functional logic, but are not limited to the above-described division, so long as the corresponding functions can be implemented, and in addition, specific names of each functional unit are only for convenience of distinguishing from each other, and are not intended to limit the scope of protection of the present application.
The above embodiments do not limit the scope of the present application. It will be apparent to those skilled in the art that various modifications, combinations, and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the scope of the present application.
Claims (7)
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| CN202511959625.5A CN121408232A (en) | 2025-12-24 | 2025-12-24 | A method and system for testing the seals of submersible sewage pumps based on coupling interface state recognition |
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| CN202511959625.5A CN121408232A (en) | 2025-12-24 | 2025-12-24 | A method and system for testing the seals of submersible sewage pumps based on coupling interface state recognition |
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