CN113944649B - Pump cavitation risk judgment method and device, electronic equipment and storage medium - Google Patents

Pump cavitation risk judgment method and device, electronic equipment and storage medium Download PDF

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CN113944649B
CN113944649B CN202111123672.8A CN202111123672A CN113944649B CN 113944649 B CN113944649 B CN 113944649B CN 202111123672 A CN202111123672 A CN 202111123672A CN 113944649 B CN113944649 B CN 113944649B
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inlet
margin
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CN113944649A (en
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李宏波
邓琬静
王升
何玉雪
宋炎林
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Gree Electric Appliances Inc of Zhuhai
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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    • G—PHYSICS
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    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
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    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract

The application relates to a pump cavitation risk judgment method and device, electronic equipment and a storage medium. The method comprises the following steps: acquiring monitoring data obtained by detecting a pump in real time, wherein the monitoring data comprises: monitoring temperature, inlet fluid velocity, and inlet pressure; acquiring pump physical property parameters corresponding to the monitored temperature; determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical parameter; determining a required cavitation margin for the pump based on the inlet fluid velocity; determining whether the pump is at risk of pump cavitation based on the effective cavitation margin of the pump, the required cavitation margin. By adopting the method, the precision of judging whether the pump cavitation risk exists can be improved.

Description

Pump cavitation risk judgment method and device, electronic equipment and storage medium
Technical Field
The present application relates to the field of industrial technologies, and in particular, to a pump cavitation risk determination method and apparatus, an electronic device, and a storage medium.
Background
With the development of industrial technology, pumps are used more and more widely, specifically, the pumps can be used as indispensable key equipment for cold energy delivery in a central air-conditioning system, and pump cavitation can occur in the operation process of the central air-conditioning system, so that a pump body, an impeller, a machine seal and a bearing are damaged.
In the traditional technology, whether pump cavitation occurs or not is mostly judged through noise of the pump during operation, and the method for judging the risk of pump cavitation is low in precision, and finally the service life of the pump is shortened.
Disclosure of Invention
In view of the above, it is desirable to provide a pump cavitation risk determination method, a pump cavitation risk determination apparatus, an electronic device, and a storage medium, which can improve the accuracy of determining a pump cavitation risk.
A method of pump cavitation risk determination, the method comprising:
acquiring monitoring data obtained by detecting a pump in real time, wherein the monitoring data comprises: monitoring temperature, inlet fluid velocity, and inlet pressure;
acquiring pump physical property parameters corresponding to the monitored temperature;
determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical parameter;
obtaining a required cavitation margin of the pump corresponding to the inlet fluid velocity;
determining whether the pump is at risk of pump cavitation based on the effective cavitation margin of the pump, the required cavitation margin.
In one embodiment, the acquiring of the pump property parameter corresponding to the monitored temperature includes:
the pump property parameter corresponding to the fluid medium type and the monitored temperature is acquired from the fluid property parameters based on the fluid medium type of the fluid entering the pump.
In one embodiment, the monitoring data further comprises: a viscosity value of a fluid entering the pump;
a manner of determining a fluid medium type of fluid entering the pump, comprising:
determining a fluid medium class of the fluid entering the pump based on the viscosity value of the fluid entering the pump.
In one embodiment, the pump physical parameters include a vaporization pressure of the pump, a fluid weight;
the determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump property parameter, comprising:
determining an effective cavitation margin of the pump as a difference between a sum of a first parameter determined from a quotient of the inlet pressure and the fluid severity and a second parameter determined from a quotient of a squared division of the inlet fluid and a gravitational acceleration, and a third parameter determined from a quotient of the gasification pressure and the fluid severity.
In one embodiment, the determining a required cavitation margin for the pump based on the inlet fluid velocity comprises:
acquiring a pump performance curve corresponding to the type of the pump according to the type of the pump, wherein the pump performance curve is a curve of inlet fluid flow and the necessary cavitation allowance of the pump;
determining an inlet fluid flow rate corresponding to the inlet fluid velocity;
determining a required cavitation margin of the pump corresponding to the inlet fluid flow based on the pump performance curve.
In one embodiment, the determining a required cavitation margin for the pump based on the inlet fluid velocity comprises: calculating and obtaining an average fluid velocity at the inlet of a working wheel of the pump and an average fluid relative velocity at the inlet of the working wheel based on the inlet fluid velocity;
acquiring an average speed parameter of the pump corresponding to the average speed of the fluid, wherein the average speed parameter is used for representing the average distance of the fluid flow;
determining an average relative velocity parameter of the pump based on the average relative velocity of the fluid, the average relative velocity parameter being indicative of an average relative distance of the fluid flow;
determining a sum of the average speed parameter and the average relative speed parameter as a required cavitation margin for the pump.
In one embodiment, the determining whether there is a risk of pump cavitation based on the effective cavitation margin of the pump and the required cavitation margin of the pump includes:
determining that a risk of pump cavitation exists when an effective cavitation margin of the pump is less than a required cavitation margin of the pump for a preset period of time.
In one embodiment, the method further comprises:
and when the pump is determined to have the pump cavitation risk based on the effective cavitation allowance and the necessary cavitation allowance of the pump, outputting prompt information.
A pump cavitation risk assessment device, the device comprising:
the monitoring data acquisition module is used for acquiring monitoring data obtained by detecting the pump in real time, and the monitoring data comprises: monitoring temperature, inlet fluid velocity, and inlet pressure;
the physical property parameter acquisition module is used for acquiring the physical property parameter of the pump corresponding to the monitored temperature;
an effective cavitation margin acquisition module for determining an effective cavitation margin of the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical property parameter;
a required cavitation margin acquisition module for acquiring a required cavitation margin of the pump corresponding to the inlet fluid speed;
and the pump cavitation risk judgment module is used for determining whether the pump has a pump cavitation risk or not based on the effective cavitation allowance and the necessary cavitation allowance of the pump.
A pump cavitation risk detection system comprising a temperature sensor, a turbine sensor, a pressure sensor, and a processor;
the temperature sensor is arranged at a fluid inlet of the pump and used for detecting the temperature of fluid entering the pump in real time, obtaining a monitored temperature and outputting the monitored temperature to the processor;
the turbine sensor is arranged at a fluid inlet of the pump and used for detecting the speed of fluid entering the pump in real time, obtaining the speed of inlet fluid and outputting the speed of the inlet fluid to the processor;
the pressure sensor is arranged at a fluid inlet of the pump and used for detecting the inlet pressure of the pump in real time, obtaining the inlet pressure and outputting the inlet pressure to the processor;
the processor is used for acquiring the pump physical property parameter corresponding to the monitored temperature; determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical parameter; obtaining a required cavitation margin of the pump corresponding to the inlet fluid velocity; determining whether the pump is at risk of pump cavitation based on the effective cavitation margin of the pump, the required cavitation margin.
In one embodiment, the system further comprises: the viscosity sensor is arranged at the inlet of the pump and used for detecting the viscosity of the inlet fluid of the pump in real time to obtain the viscosity value of the inlet fluid;
the processor is further configured to determine a fluid medium class of the fluid entering the pump based on the viscosity value.
An electronic device comprises a memory and a processor, wherein the memory stores a computer program, and the processor realizes the steps of the pump cavitation risk judgment method when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned pump cavitation risk judgment method.
According to the pump cavitation risk judgment method and device, the electronic equipment and the storage medium, the pump is subjected to real-time detection to obtain monitoring data, wherein the monitoring data comprise: the method comprises the steps of monitoring temperature, inlet fluid speed and inlet pressure, obtaining pump physical parameters corresponding to the monitored temperature, determining effective cavitation allowance of a pump based on the inlet fluid speed, the inlet pressure and the pump physical parameters, determining necessary cavitation allowance of the pump based on the inlet fluid speed, and finally judging whether pump cavitation risks occur or not according to the effective cavitation allowance of the pump and the necessary cavitation allowance of the pump. By the method, whether the pump has cavitation failure or not can be found in time, so that the safety and reliability of the operation of the pump can be improved.
Drawings
FIG. 1 is a diagram of an exemplary pump cavitation risk assessment method;
FIG. 2 is a diagram of an exemplary pump cavitation risk assessment method;
FIG. 3 is a diagram of an exemplary application of the pump cavitation risk determination method;
FIG. 4 is a schematic flow chart illustrating a pump cavitation risk determination method according to an embodiment;
FIG. 5 is a schematic flow chart illustrating a pump cavitation risk determination method according to an embodiment;
FIG. 6 is a block diagram showing a pump cavitation risk judging means in one embodiment;
FIG. 7 is a diagram of the internal structure of an electronic device in one embodiment;
FIG. 8 is a diagram illustrating the internal architecture of an electronic device in one embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The pump cavitation risk judgment method provided by the application can be applied to a pump cavitation risk judgment system shown in fig. 1. The pump cavitation risk judgment system may include the electronic device 10 and the monitoring device 20, wherein the monitoring device 20 may include a temperature sensor, a turbine sensor, and a pressure sensor. Wherein the monitoring device 20 is connected to the electronic device 10. In some embodiments, the electronic device 10 may be a terminal device, which may be separate from the monitoring device 20 or may be integrated with the monitoring device 20, as shown in FIG. 2. The terminal device may be, but is not limited to, various control chips, personal computers, notebook computers, smart phones, tablet computers, and portable wearable devices. In other embodiments, the electronic device 10 may also be a server independent from the monitoring device 20, and the server may be implemented by a separate server or a server cluster composed of a plurality of servers.
In one embodiment, the temperature sensor is disposed at the fluid inlet of the pump, and is configured to detect the temperature of the fluid entering the pump in real time, obtain a monitored temperature, and output the monitored temperature to the electronic device 10;
in one embodiment, a turbine sensor is disposed at the fluid inlet of the pump for detecting the velocity of the fluid entering the pump in real time, obtaining the inlet fluid velocity, and outputting the inlet fluid velocity to the electronic device 10.
In one embodiment, a pressure sensor is disposed at the fluid inlet of the pump for detecting the inlet pressure of the pump in real time, obtaining the inlet pressure, and outputting the inlet pressure to the electronic device 10.
In one embodiment, referring to fig. 3, the monitoring device 20 may further include a viscosity sensor, wherein the viscosity sensor is disposed at the inlet of the pump and is used for detecting the viscosity of the inlet fluid of the pump in real time to obtain a viscosity value of the inlet fluid.
Specifically, when pump cavitation risk judgment is performed, the electronic device 10 acquires monitoring data obtained by performing real-time detection on the pump, where the monitoring data includes: monitoring temperature, inlet fluid velocity, and inlet pressure; acquiring pump physical property parameters corresponding to the monitored temperature; determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical property parameter; acquiring a necessary cavitation margin of the pump corresponding to the inlet fluid velocity; determining whether the pump is at risk of pump cavitation based on the effective cavitation margin of the pump and the necessary cavitation margin.
The centrifugal water pump, the positive displacement pump and the like may have a risk of pump cavitation in the operation process, and the centrifugal water pump in the central air-conditioning system is greatly affected by the pump cavitation, so in the embodiments of the present application, the centrifugal water pump of the central air-conditioning system is taken as an example for explanation.
In one embodiment, as shown in fig. 4, a pump cavitation risk determination method is provided, which is described by taking the method as an example applied to the electronic device in fig. 1, and includes the following steps:
step S402, acquiring monitoring data obtained by real-time detection of the pump, wherein the monitoring data comprises: the temperature, inlet fluid velocity, and inlet pressure are monitored.
In one embodiment, the pump is a refrigeration capacity delivery device in a central air conditioning system, specifically, fluid flowing into the pump cannot naturally flow due to the restriction of resistance, the pump can drive the fluid to circulate for the purpose of heat exchange, the monitored temperature refers to the temperature of fluid at the inlet of the pump, the speed of the fluid at the inlet refers to the distance traveled by the fluid in unit time, and the inlet pressure refers to the liquid supply pressure at the water inlet end of the pump.
The temperature of the pump fluid can be detected in real time by arranging a temperature sensor at the fluid inlet of the pump, the inlet fluid speed can be detected in real time by arranging a turbine sensor, and the inlet pressure can be detected in real time by arranging a pressure sensor.
And S404, acquiring pump physical property parameters corresponding to the monitoring temperature.
In one embodiment, the pump property parameter refers to the obtained related parameters of the fluid at different temperatures, wherein the pump property parameter can be obtained through experiments and stored in the pump property parameter library. After the real-time monitoring temperature is obtained, the pump physical property parameter corresponding to the monitoring temperature can be obtained.
Step S406, determining an effective cavitation margin of the pump based on the inlet fluid velocity, the inlet pressure, and the pump physical property parameter.
In one embodiment, the effective cavitation margin of the pump refers to the surplus energy of super-supersaturated vapor pressure per unit weight when the fluid flows to the inlet of the pump, and the effective cavitation margin of the pump can be determined through the inlet fluid speed, the inlet pressure and the physical parameters of the pump.
In step S408, a necessary cavitation margin for the pump is determined based on the inlet fluid velocity.
In one embodiment, the necessary cavitation margin of the pump is the pressure drop of the fluid flowing from the pump inlet to the lowest pressure at the vane inlet of the pump, and the necessary cavitation margin of the pump is determined by the inlet fluid velocity.
And step S410, determining whether the pump has a pump cavitation risk or not based on the effective cavitation allowance and the necessary cavitation allowance of the pump.
In one embodiment, based on the effective cavitation margin and the required cavitation margin of the pump, it may be determined whether the pump is at risk of pump cavitation.
In the method for judging the risk of pump cavitation, the pump is subjected to real-time detection to obtain monitoring data, wherein the monitoring data comprises: the method comprises the steps of monitoring temperature, inlet fluid speed and inlet pressure, obtaining pump physical parameters corresponding to the monitored temperature, determining effective cavitation allowance of a pump based on the inlet fluid speed, the inlet pressure and the pump physical parameters, determining necessary cavitation allowance of the pump based on the inlet fluid speed, and finally judging whether pump cavitation risks occur or not according to the effective cavitation allowance of the pump and the necessary cavitation allowance of the pump. By the method, whether the pump has cavitation failure or not can be found in time, so that the safety and reliability of the operation of the pump can be improved.
In one embodiment, the acquiring of the pump property parameter corresponding to the monitored temperature includes:
the pump property parameter corresponding to the fluid medium type and the monitored temperature is acquired from the fluid property parameters based on the fluid medium type of the fluid entering the pump.
In one embodiment, the fluid medium type of the fluid of the pump refers to a type of the fluid flowing into the inlet of the pump, wherein the fluid type may be ethanol, water, or the like, different fluid media may correspond to corresponding fluid property parameters, specifically, water corresponds to a water property parameter, ethanol corresponds to an ethanol property parameter library, when the fluid medium type of the fluid is water, the pump property parameter corresponding to water and the monitored temperature may be obtained from the water property parameter, and when the fluid medium type of the fluid is ethanol, the pump property parameter corresponding to water and the monitored temperature may be obtained from the ethanol property parameter. According to the method, the pump physical property parameter corresponding to the monitored temperature can be obtained according to the type of the fluid medium.
In one embodiment, the detecting data further comprises: a viscosity value of a fluid entering the pump;
a manner of determining a fluid medium type of fluid entering the pump, comprising:
determining a fluid medium class of the fluid entering the pump based on the viscosity value of the fluid entering the pump.
In one embodiment, the viscosity value of the fluid of the pump refers to the density of the fluid, and by arranging the viscosity sensor at the inlet of the pump, the viscosity of the inlet fluid of the pump can be detected in real time to obtain the viscosity value of the inlet fluid, so that the fluid medium category of the fluid can be determined by the method.
In one embodiment, the pump physical parameters include a vaporization pressure of the pump, a fluid weight;
the determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump property parameter, comprising:
determining an effective cavitation margin of the pump as a difference between a sum of a first parameter determined from a quotient of the inlet pressure and the fluid severity and a second parameter determined from a quotient of a squared inlet fluid velocity divided by a gravitational acceleration, and a third parameter determined from a quotient of the gasification pressure and the fluid severity.
In one embodiment, the physical parameters of the pump may include a vaporization pressure of the pump, a fluid gravity, and a fluid velocity of the pump, wherein the vaporization pressure of the pump refers to a pressure at which vaporization occurs when a liquid level pressure of the liquid at a certain temperature drops to a certain value, and the fluid gravity refers to a gravity of the fluid per unit volume, and the effective cavitation margin of the pump may be determined by the inlet fluid velocity, the inlet pressure, and the physical parameters of the pump, and specifically, the effective cavitation margin of the pump may be determined by the following formula:
Figure BDA0003277955650000081
where NPSHa refers to the effective cavitation margin of the pump, ps refers to the inlet pressure, λ refers to the fluid gravity, vs refers to the inlet fluid velocity, g refers to the gravitational acceleration, and Pv refers to the gasification pressure.
In one embodiment, the determining a required cavitation margin for the pump based on the inlet fluid velocity comprises:
acquiring a pump performance curve corresponding to the type of the pump according to the type of the pump, wherein the pump performance curve is a curve of inlet fluid flow and the necessary cavitation allowance of the pump;
determining an inlet fluid flow rate corresponding to the inlet fluid velocity;
determining a required cavitation margin of the pump corresponding to the inlet fluid flow based on the pump performance curve.
In one embodiment, the pumps of different models each have a corresponding pump performance curve, the pump performance curve is a curve of an inlet fluid flow rate and a required cavitation margin of the pump, the inlet fluid flow rate is a fluid amount delivered by the pump in a unit time, and after the inlet fluid flow rate corresponding to the inlet fluid speed is determined, the required cavitation margin of the pump corresponding to the determined inlet fluid flow rate can be obtained based on the pump performance curve. So that the necessary cavitation margin of the pump can be determined quickly by the above-described method.
In one embodiment, the determining a required cavitation margin for the pump based on the inlet fluid velocity comprises, in one embodiment:
calculating and obtaining an average fluid velocity at the inlet of a working wheel of the pump and an average fluid relative velocity at the inlet of the working wheel based on the inlet fluid velocity;
an average speed parameter of the pump corresponding to the average speed of the fluid is obtained, the average speed parameter being an average distance representing the fluid flow.
Determining an average relative velocity parameter of the pump based on the average relative velocity of the fluid, the average relative velocity parameter being indicative of an average relative distance of the fluid flow;
determining a sum of the average speed parameter and the average relative speed parameter as a required cavitation margin for the pump.
In one embodiment, the average distance of the fluid flow is a parameter obtained by dividing the average fluid velocity by the gravitational acceleration, the average relative distance of the fluid flow is a parameter used for representing that the average relative distance of the fluid flow is calculated by an experimental coefficient, the average fluid relative velocity and the gravitational acceleration, and the average fluid velocity at the inlet of the working wheel of the pump and the average fluid relative velocity at the inlet of the working wheel can be obtained by calculating the fluid velocity at the inlet;
in one embodiment, the necessary cavitation margin may be calculated using the following equation:
Figure BDA0003277955650000091
wherein NPSHr refers to the necessary cavitation margin of the pump, V 0 Means the average velocity of the fluid, λ 2 Is referred to as the experimental coefficient, w 0 Refers to the average relative velocity of the fluid, and g refers to the acceleration of gravity.
In one embodiment, the determining whether there is a risk of pump cavitation based on the effective cavitation margin of the pump and the required cavitation margin of the pump includes:
determining that a risk of pump cavitation exists when an effective cavitation margin of the pump is less than a required cavitation margin of the pump for a preset period of time.
In one embodiment, the preset time period may be 1 minute or 30 minutes, and the specific time of the preset time period may be adjusted according to an actual situation, wherein when the preset time period is 1 minute, the effective cavitation allowance of the pump may be set to be compared with the necessary cavitation allowance of the pump every 5s, so as to obtain a comparison result. In one minute, when the effective cavitation margin of the pump is continuously smaller than the necessary cavitation margin of the pump, that is, the effective cavitation margin of the pump is smaller than the necessary cavitation margin of the pump in the 12 comparison results, it may be determined that the risk of cavitation exists, or when the number of times that the effective cavitation margin of the pump is smaller than the necessary cavitation margin of the pump is greater than one-half of the total number of the comparison results, that is, greater than 6 times, it is determined that the risk of cavitation exists. So that it is possible to determine whether a risk of cavitation has occurred by the above-described method.
In one embodiment, the method further comprises:
and when the pump is determined to have cavitation risk, outputting prompt information.
In one embodiment, when it is determined that the pump has a risk of cavitation, a prompt message may be output, where the prompt message may be a voice message, a text message, or the like, and when the prompt message is a text message, the text message may be adjusting an opening of an outlet valve of the pump, decreasing a flow rate of the pump, decreasing a working water temperature of the pump, decreasing a rotation speed of the pump, or the like. Therefore, the method can give the fault diagnosis advice in time, so that the relevant personnel can solve the problems in time.
In one embodiment, as shown in fig. 5, a schematic flow chart of a pump cavitation risk judgment method in a specific embodiment is shown:
the monitoring device may include a temperature sensor, a turbine sensor, a pressure sensor, and a viscosity sensor, the monitoring device is connected to the electronic device, the temperature sensor is disposed at a fluid inlet of the pump and is configured to detect a temperature of a fluid entering the pump in real time to obtain a monitored temperature, the turbine sensor is disposed at the fluid inlet of the pump and is configured to detect a speed of the fluid entering the pump in real time to obtain an inlet fluid speed, the pressure sensor is disposed at the fluid inlet of the pump and is configured to detect an inlet pressure of the pump in real time to obtain the inlet pressure, and the viscosity sensor is disposed at an inlet of the pump and is configured to detect a viscosity of the inlet fluid of the pump in real time to obtain a viscosity value of the inlet fluid.
The electronic device can acquire monitoring data obtained by detecting the pump in real time, and the monitoring data comprises: the method comprises the steps of monitoring temperature, inlet fluid speed, inlet pressure and inlet fluid viscosity, wherein after the real-time monitored temperature is obtained, pump physical property parameters corresponding to the monitored temperature can be obtained, the pump physical property parameters refer to obtained related parameters of the fluid at different temperatures, and the pump physical property parameters can be obtained through experiments and stored in a pump physical property parameter library.
Specifically, when the pump property parameter is acquired, the pump property parameter corresponding to the fluid medium type and the monitored temperature may be acquired from the fluid property parameter based on the fluid medium type of the fluid entering the pump, the fluid medium type of the fluid of the pump may be a type of the fluid flowing into the pump inlet, the fluid type may be ethanol, water, or the like, different fluid media may correspond to the corresponding fluid property parameter, specifically, water corresponds to the water property parameter, and ethanol corresponds to the ethanol property parameter library.
The effective cavitation margin of the pump can be determined through the inlet fluid speed, the inlet pressure and the pump physical parameters, wherein the effective cavitation margin of the pump refers to the surplus energy of super-supersaturated steam pressure per unit weight when the fluid flows to the inlet of the pump.
Wherein, through the inlet fluid speed, the necessary cavitation allowance of the pump can be determined, and the necessary cavitation allowance of the pump refers to the pressure drop of the fluid flowing from the inlet of the pump to the lowest pressure of the inlet of the vane of the pump.
After obtaining the effective cavitation allowance and the necessary cavitation allowance of the pump, determining whether a risk of pump cavitation exists based on the effective cavitation allowance and the necessary cavitation allowance of the pump, specifically, in a preset time period, when the effective cavitation allowance of the pump is smaller than the necessary cavitation allowance of the pump, determining that the risk of pump cavitation exists, the preset time period may be 1 minute or 30 minutes, and the specific time of the preset time period may be adjusted according to an actual situation, wherein when the preset time period is 1 minute, the effective cavitation allowance of the pump and the necessary cavitation allowance of the pump may be compared once every 5s to obtain a comparison result. In one minute, when the effective cavitation margin of the pump is continuously smaller than the necessary cavitation margin of the pump, that is, the effective cavitation margin of the pump is smaller than the necessary cavitation margin of the pump in the 12 comparison results, it may be determined that the risk of cavitation exists, or when the number of times that the effective cavitation margin of the pump is smaller than the necessary cavitation margin of the pump is greater than one-half of the total number of the comparison results, that is, greater than 6 times, it is determined that the risk of cavitation exists. So that it is possible to determine whether a risk of cavitation has occurred by the above-described method.
When the pump is determined to have cavitation risk, prompt information can be output, wherein the prompt information can be voice information, text information and the like, and when the prompt information is the text information, the text information can be used for adjusting the opening of an outlet valve of the pump, reducing the flow rate of the pump, reducing the working water temperature of the pump, reducing the rotating speed of the pump and the like. Therefore, the method can give the fault diagnosis advice in time, so that the relevant personnel can solve the problems in time.
It should be understood that although the various steps in the flow charts of fig. 4-5 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 4-5 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed in turn or alternately with other steps or at least some of the other steps.
In one embodiment, as shown in fig. 6, there is provided a pump cavitation risk judging device including: a monitoring data obtaining module 602, a physical property parameter obtaining module 604, an effective cavitation margin obtaining module 606, a necessary cavitation margin obtaining module 608, and a pump cavitation risk determining module 610, wherein:
a monitoring data obtaining module 602, configured to obtain monitoring data obtained by performing real-time detection on the pump, where the monitoring data includes: the temperature, inlet fluid velocity, and inlet pressure are monitored.
And a physical property parameter obtaining module 604, configured to obtain a pump physical property parameter corresponding to the monitored temperature.
An effective cavitation margin acquisition module 606 for acquiring a required cavitation margin of the pump corresponding to the inlet fluid speed.
A required cavitation margin acquisition module 608 to determine a required cavitation margin for the pump based on the inlet fluid speed.
The pump cavitation risk determination module 610 determines whether the pump has a risk of pump cavitation based on the effective cavitation margin of the pump and the required cavitation margin.
In one embodiment, the property parameter acquiring module is configured to acquire a pump property parameter corresponding to the fluid medium type and the monitored temperature from the fluid property parameter based on the fluid medium type of the fluid entering the pump.
In one embodiment, the apparatus further comprises:
a fluid medium class determination module to determine a fluid medium class of the fluid entering the pump based on the viscosity value of the fluid entering the pump.
In one embodiment, the effective cavitation margin obtaining module is configured to determine an effective cavitation margin of the pump as a difference between a sum of a first parameter and a second parameter, the first parameter being determined according to a quotient of the inlet pressure and the fluid weight, the second parameter being determined according to a quotient of a squared division of the inlet fluid and the gravitational acceleration, and a third parameter being determined according to a quotient of the gasification pressure and the fluid weight, and the pump physical property parameters include the gasification pressure and the fluid weight of the pump.
In one embodiment, the system comprises a necessary cavitation allowance acquisition module, a pump performance curve acquisition module and a control module, wherein the necessary cavitation allowance acquisition module is used for acquiring a pump performance curve corresponding to the model of the pump according to the model of the pump, and the pump performance curve is a curve of inlet fluid flow and necessary cavitation allowance of the pump; determining an inlet fluid flow rate corresponding to the inlet fluid velocity; determining a required cavitation margin of the pump corresponding to the inlet fluid flow based on the pump performance curve.
In one embodiment, the necessary cavitation margin acquisition module is used for calculating and obtaining the average fluid speed at the inlet of a working wheel of the pump and the average fluid relative speed at the inlet of the working wheel based on the inlet fluid speed; acquiring an average speed parameter of the pump corresponding to the average speed of the fluid, wherein the average speed parameter is used for representing the average distance of the fluid flow; determining an average relative velocity parameter of the pump based on the average relative velocity of the fluid, the average relative velocity parameter being indicative of an average relative distance of the fluid flow; determining a sum of the average speed parameter and the average relative speed parameter as a required cavitation margin for the pump.
In one embodiment, the pump cavitation risk determination module is configured to determine that a pump cavitation risk exists when an effective cavitation margin of the pump is less than a required cavitation margin of the pump in a preset time period.
In one embodiment, the apparatus further comprises:
and the prompt information output module is used for outputting prompt information when the pump is determined to have the pump cavitation risk based on the effective cavitation allowance and the necessary cavitation allowance of the pump.
For the specific definition of the pump cavitation risk judgment device, reference may be made to the above definition of the pump cavitation risk judgment method, which is not described herein again. All or part of the modules in the pump cavitation risk judgment device can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent of a processor in the electronic device, or can be stored in a memory in the electronic device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, an electronic device is provided, which may be a server, and its internal structure diagram may be as shown in fig. 7. The electronic device includes a processor, a memory, and a network interface connected by a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The database of the electronic device is used for storing monitoring data. The network interface of the electronic device is used for connecting and communicating with an external terminal through a network. The computer program is executed by a processor to implement a pump cavitation risk determination method.
In one embodiment, an electronic device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The electronic device comprises a processor, a memory, a communication interface, a display screen and an input device which are connected through a system bus. Wherein the processor of the electronic device is configured to provide computing and control capabilities. The memory of the electronic equipment comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the electronic device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a pump cavitation risk determination method. The display screen of the electronic equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the electronic equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the electronic equipment, an external keyboard, a touch pad or a mouse and the like.
It will be understood by those skilled in the art that the configurations shown in fig. 7 and 8 are only block diagrams of some configurations relevant to the present disclosure, and do not constitute a limitation on the electronic devices to which the present disclosure may be applied, and a particular electronic device may include more or less components than those shown in the drawings, or may combine certain components, or have a different arrangement of components.
In one embodiment, an electronic device is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the pump cavitation risk judgment method when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of the above-mentioned pump cavitation risk judgment method.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method for determining risk of pump cavitation, the method comprising:
acquiring monitoring data obtained by detecting a pump in real time, wherein the monitoring data comprises: monitoring temperature, inlet fluid velocity, and inlet pressure, the pump being a refrigeration delivery device in a central air conditioning system;
determining a fluid media class of the fluid entering the pump based on a viscosity value of the fluid entering the pump, the fluid media class being a type of fluid flowing into a pump inlet;
acquiring pump physical property parameters corresponding to the fluid medium type and the monitored temperature from fluid physical property parameters based on the fluid medium type, wherein the pump physical property parameters comprise the gasification pressure and the fluid gravity of a pump;
determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and a gasification pressure, fluid severity, of the pump;
obtaining a required cavitation margin of the pump corresponding to the inlet fluid velocity;
determining whether the pump is at risk of pump cavitation based on the effective cavitation margin of the pump, the required cavitation margin;
the determining whether a risk of pump cavitation exists based on the effective cavitation margin of the pump, the required cavitation margin of the pump, comprises:
in a preset time period, comparing the effective cavitation allowance of the pump with the necessary cavitation allowance of the pump at intervals of a preset time length to obtain a comparison result, and when the effective cavitation allowance of the pump in the preset time period is continuously smaller than the necessary cavitation allowance of the pump, or the number of times that the effective cavitation allowance of the pump in the preset time period is smaller than the necessary cavitation allowance of the pump is larger than one-half of the total number of the comparison results, determining that the risk of pump cavitation exists, wherein the preset time length is smaller than the preset time period.
2. The method of claim 1,
the determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and the pump property parameter, comprising:
determining an effective cavitation margin of the pump as a difference between a sum of a first parameter determined from a quotient of the inlet pressure and the fluid severity and a second parameter determined from a quotient of a square of the inlet fluid and the gravitational acceleration, and a third parameter determined from a quotient of the gasification pressure and the fluid severity.
3. The method of claim 1, wherein the determining a necessary cavitation margin for the pump based on the inlet fluid velocity comprises:
acquiring a pump performance curve corresponding to the type of the pump according to the type of the pump, wherein the pump performance curve is a curve of inlet fluid flow and the necessary cavitation allowance of the pump;
determining an inlet fluid flow rate corresponding to the inlet fluid velocity;
determining a required cavitation margin for the pump corresponding to the inlet fluid flow based on the pump performance curve;
or the like, or, alternatively,
calculating and obtaining an average fluid velocity at the inlet of a working wheel of the pump and an average fluid relative velocity at the inlet of the working wheel based on the inlet fluid velocity;
acquiring an average speed parameter of the pump corresponding to the average speed of the fluid, wherein the average speed parameter is used for representing the average distance of the fluid flow;
determining an average relative velocity parameter of the pump based on the average relative velocity of the fluid, the average relative velocity parameter being indicative of an average relative distance of the fluid flow;
determining a sum of the average speed parameter and the average relative speed parameter as a required cavitation margin for the pump.
4. The method of claim 1, further comprising:
and when the pump is determined to have the pump cavitation risk based on the effective cavitation allowance and the necessary cavitation allowance of the pump, outputting prompt information.
5. A pump cavitation risk judgment device, characterized in that the device comprises:
the monitoring data acquisition module is used for acquiring monitoring data obtained by detecting the pump in real time, and the monitoring data comprises: monitoring temperature, inlet fluid velocity, and inlet pressure, the pump being a refrigeration delivery device in a central air conditioning system;
the physical property parameter acquisition module is used for determining the fluid medium category of the fluid entering the pump based on the viscosity value of the fluid entering the pump, wherein the fluid medium category is the type of the fluid flowing into the inlet of the pump; acquiring a pump physical property parameter corresponding to the fluid medium type and the monitored temperature from fluid physical property parameters based on the fluid medium type; the physical parameters of the pump comprise the gasification pressure and the fluid gravity of the pump;
an effective cavitation margin acquisition module for determining an effective cavitation margin of the pump based on the inlet fluid speed, the inlet pressure, and the gasification pressure and fluid severity of the pump;
a required cavitation margin acquisition module for acquiring a required cavitation margin of the pump corresponding to the inlet fluid speed;
and the pump cavitation risk judgment module is used for comparing the effective cavitation allowance of the pump with the necessary cavitation allowance of the pump at intervals of preset time to obtain a comparison result, and when the effective cavitation allowance of the pump in the preset time is continuously smaller than the necessary cavitation allowance of the pump, or the number of times that the effective cavitation allowance of the pump in the preset time is smaller than the necessary cavitation allowance of the pump is larger than one-half of the total number of the comparison results, determining that the pump cavitation risk exists, wherein the preset time is smaller than the preset time.
6. The apparatus of claim 5, wherein the effective cavitation margin acquisition module is further configured to: determining an effective cavitation margin of the pump as a difference between a sum of a first parameter determined from a quotient of the inlet pressure and the fluid severity and a second parameter determined from a quotient of a square of the inlet fluid and the gravitational acceleration, and a third parameter determined from a quotient of the gasification pressure and the fluid severity.
7. The apparatus of claim 5, further comprising:
and the prompt information output module is used for outputting prompt information when the pump is determined to have the pump cavitation risk based on the effective cavitation allowance and the necessary cavitation allowance of the pump.
8. A pump cavitation risk detection system comprising a temperature sensor, a turbine sensor, a pressure sensor, a viscosity sensor, and a processor;
the temperature sensor is arranged at a fluid inlet of the pump and used for detecting the temperature of fluid entering the pump in real time to obtain a monitored temperature and outputting the monitored temperature to the processor, and the pump is cold energy conveying equipment in a central air-conditioning system;
the turbine sensor is arranged at a fluid inlet of the pump and used for detecting the speed of fluid entering the pump in real time, obtaining the speed of inlet fluid and outputting the speed of the inlet fluid to the processor;
the pressure sensor is arranged at a fluid inlet of the pump and used for detecting the inlet pressure of the pump in real time, obtaining the inlet pressure and outputting the inlet pressure to the processor;
the viscosity sensor is arranged at the inlet of the pump and used for detecting the viscosity of the inlet fluid of the pump in real time to obtain the viscosity value of the inlet fluid;
the processor is configured to determine a fluid medium category of the fluid entering the pump based on a viscosity value of the fluid entering the pump, the fluid medium category being a type of fluid flowing into an inlet of the pump; acquiring pump physical property parameters corresponding to the fluid medium type and the monitored temperature from fluid physical property parameters based on the fluid medium type, wherein the pump physical property parameters comprise the gasification pressure and the fluid gravity of a pump; determining an effective cavitation margin for the pump based on the inlet fluid velocity, the inlet pressure, and a gasification pressure, fluid severity, of the pump; obtaining a required cavitation margin of the pump corresponding to the inlet fluid velocity; in a preset time period, comparing the effective cavitation allowance of the pump with the necessary cavitation allowance of the pump at intervals of a preset time length to obtain a comparison result, and when the effective cavitation allowance of the pump in the preset time period is continuously smaller than the necessary cavitation allowance of the pump, or the number of times that the effective cavitation allowance of the pump in the preset time period is smaller than the necessary cavitation allowance of the pump is larger than one-half of the total number of the comparison results, determining that the risk of pump cavitation exists, wherein the preset time length is smaller than the preset time period.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any of claims 1 to 4 when executing the computer program.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 4.
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CN101846105B (en) * 2010-06-11 2011-12-07 华北电力科学研究院(西安)有限公司 Anti-cavitation protection device of feedwater pump
CN105224810A (en) * 2015-10-15 2016-01-06 中国大唐集团科学技术研究院有限公司华东分公司 A kind of method of quick judgement pump cavitation
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CN110821849B (en) * 2019-12-03 2020-10-30 湖南凯利特泵业有限公司 Cavitation monitoring method for fire pump
CN111946671A (en) * 2020-08-20 2020-11-17 福建蓝海节能科技有限公司 Method for effectively preventing cavitation of water pump
CN113202787B (en) * 2021-06-07 2022-08-09 中国计量大学 Numerical simulation prediction method for necessary cavitation allowance of volute type centrifugal pump

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