Method for measuring axial force of magnetic energy-saving pump in instantaneous high temperature difference environment

Abstract

The invention discloses a method for measuring axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment, relates to the field of magnetic energy-saving pumps, and solves the problem of low measurement accuracy of correspondingly calculated axial force of the magnetic energy-saving pump. The method comprises the following steps: acquiring component contours and material types of different components in the magnetic energy-saving pump; constructing a three-dimensional model of the magnetic energy-saving pump according to the component contours of the different components, and solving a varying temperature field of the magnetic energy-saving pump according to the material types of the different components; the surface temperature measured by the thermal infrared imager is compared with the simulated temperature value of the varying temperature field, and the accuracy of the varying temperature field is judged; performing structural mechanical analysis on the magnetic energy-saving pump to obtain a thermal stress corresponding to the magnetic energy-saving pump, and obtaining a calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; according to the method, the corresponding calculation axial force of the magnetic energy-saving pump is accurately measured, and safe operation of the magnetic energy-saving pump is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetic energy-saving pumps, and specifically relates to a method for measuring axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment. Background Technique

[0002] A magnetic energy-saving pump is a leak-free pump that uses a magnetic coupling to transmit torque. It realizes the transmission of torque through magnetic force, thus avoiding the mechanical seal problem in traditional pumps. It has the advantages of no leakage, low noise, low vibration, high efficiency, etc. Axial force refers to the force along the axis of an object, that is, the force acting on an object to make it move or maintain balance along the axis. In physics and engineering, axial force usually refers to the component of the force along the axis of an object; when the axial force in a magnetic energy-saving pump is too large, it will break through the limit of the thrust disk and cause damage to the magnetic energy-saving pump. Therefore, it is necessary to accurately measure the axial force of the magnetic energy-saving pump.

[0003] However, at present, when calculating the axial force of a magnetic energy-saving pump, the eddy current displacement sensor method is commonly used. However, due to the influence of high temperature factors, the measurement accuracy of the traditional method drops sharply, which leads to the inability to judge the tolerance of the thrust disk, resulting in the destruction of the magnetic energy-saving pump and threatening the personal safety and property of users. Therefore, the present invention proposes a method for measuring axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment. Summary of the Invention

[0004] The purpose of the present invention is to propose a method for measuring axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment to solve the problems raised in the above background technique.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A method for measuring axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment, the method includes: Step S1, collecting the component profiles and material types of different components in the magnetic energy-saving pump; Step S2, constructing a three-dimensional model of the magnetic energy-saving pump according to the component profiles of different components, and solving the variable temperature field of the magnetic energy-saving pump according to the material types of different components; Step S3, comparing the surface temperature measured by an infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field; Step S4, performing structural mechanics analysis on the magnetic energy-saving pump to obtain the corresponding thermal stress of the magnetic energy-saving pump, and obtaining the corresponding calculated axial force of the magnetic energy-saving pump based on the thermal stress; Step S5, judging the tolerance of the thrust disk according to the calculated axial force and giving an alarm.

[0006] Further, the step S2 includes the following sub-steps: Step S21, obtain the component profiles of different components in the magnetic energy-saving pump; Step S22, collect the CAD drawings of the magnetic energy-saving pump, and construct a three-dimensional geometric model of the magnetic energy-saving pump in combination with the component profiles of different components; Step S23, establish a three-dimensional coordinate system with the geometric center of the magnetic energy-saving pump as the origin, and only regard the magnetic energy-saving pump as an effective coordinate point in the three-dimensional coordinate system; Step S24, solve the temperature field of the magnetic energy-saving pump under the steady-state temperature condition; Step S25, solve the temperature field of the magnetic energy-saving pump under the dynamic temperature condition Step S26, obtain the variable temperature field affected by the temperature change of the fluid medium by taking the difference between the temperature field of the magnetic energy-saving pump under the dynamic temperature condition and the temperature field of the magnetic energy-saving pump under the steady-state temperature condition; Step S27, superimpose the variable temperature field and the three-dimensional coordinate system to obtain the variable temperature field corresponding to different coordinate points of the magnetic energy-saving pump.

[0007] Furthermore, the steady-state temperature condition means that the fluid medium transported in the magnetic energy-saving pump is at a constant temperature and regarded as the ambient temperature; The dynamic temperature condition means that the fluid medium transported in the magnetic energy-saving pump has a variable temperature.

[0008] Furthermore, the specific process of solving the temperature field corresponding to the magnetic energy-saving pump under the steady-state temperature condition is as follows: Step S241, collect the ambient temperature HW of the environment where the magnetic energy-saving pump is located and the actual temperature BW of the corresponding outer shell surface of the magnetic energy-saving pump; Step S242, calculate the external heat convection WR of the corresponding outer shell surface of the magnetic energy-saving pump based on Newton's cooling law, and the specific formula is as follows: WR = h × (BW - HW); where h is the convective heat transfer coefficient; Step S243, then collect the impeller speed ZS, impeller diameter ZJ of the impeller in the magnetic energy-saving pump, and the medium density ρ and effective cross-sectional area JMJ of the fluid medium.

[0009] Furthermore, the process of solving the temperature field corresponding to the magnetic energy-saving pump under the steady-state temperature condition also includes: Step S244, calculate the frictional heat convection MR at the impeller through the formula, and the specific formula is as follows: ; where μ is the dynamic viscosity of the fluid medium; Step S245, regard the heat transfer of the magnetic energy-saving pump under the steady-state temperature condition as uniform, and solve T1 through the formula to obtain the temperature of any point in the temperature field. The specific formula is: ▽×(k▽T1) + MR + WR = 0; where k is the thermal conductivity and ▽ is the gradient operator.

[0010] Furthermore, the solution process of the temperature field corresponding to the magnetic energy-saving pump under the dynamic temperature state is as follows: Step S251, set the total temperature change value WBZ and the temperature change duration WSC of the fluid medium; Step S252, divide the temperature change duration into multiple temperature change intervals, and record the number of each group as i, i = 1, 2,..., z, where z is a positive integer; Step S253, for any temperature change interval, obtain the temperature change rate of the corresponding temperature change interval by subtracting the temperature value corresponding to the left endpoint from the temperature value corresponding to the right endpoint and dividing by the interval duration; Step S254, record the temperature values of multiple coordinate points in the magnetic energy-saving pump at the end of the temperature change interval, calculate the difference between the corresponding temperature value and the ambient temperature, and obtain the temperature change rate of the corresponding coordinate point by dividing the difference by the interval duration.

[0011] Furthermore, the solution process of the temperature field corresponding to the magnetic energy-saving pump under the dynamic temperature state also includes: Step S255, obtain the proportionality coefficient of the corresponding coordinate point by dividing the temperature change rate of any coordinate point by the temperature change rate of the temperature change interval; calculate the remaining proportionality coefficient of the corresponding coordinate point according to the remaining temperature change intervals; add up all the proportionality coefficients corresponding to the same coordinate point and take the average to obtain the average proportionality coefficient of the corresponding coordinate point; calculate the standard deviation of the proportionality coefficient corresponding to the corresponding coordinate point according to the average proportionality coefficient; Take the average proportionality coefficient plus the standard deviation of the proportionality coefficient as the right endpoint, and the average proportionality coefficient minus the standard deviation of the proportionality coefficient as the left endpoint to obtain the screening interval; remove the proportionality coefficients outside the screening interval, and add up the remaining proportionality coefficients to obtain the optimized proportionality coefficient of the corresponding coordinate point; similarly, calculate the optimized proportionality coefficients of all coordinate points according to the temperature change intervals; Step S256, comprehensively consider all the optimized proportionality coefficients to obtain the relationship between the temperature changes at all positions in the temperature field corresponding to the electromagnetic energy-saving pump and the temperature change of the fluid medium; denoted as LTW = λ×WDC; where LTW is the temperature value of the fluid medium, WDC is the temperature value of any point in the temperature field corresponding to the electromagnetic energy-saving pump, and λ is the optimized proportionality coefficient; Step S257, solve for T2 through the formula to obtain the temperature of any point in the temperature field. The specific formula is: ; where ρ2 is the density of different components corresponding to the electromagnetic energy-saving pump, C is the specific heat capacity at constant pressure of different components corresponding to the electromagnetic energy-saving pump, and DMR is the frictional heat convection at the impeller of the electromagnetic energy-saving pump under the dynamic temperature state.

[0012] Furthermore, the step S3 includes the following sub-steps: Step S31: Inject the actual fluid medium into the magnetic energy-saving pump and set the actual change temperature and temperature change duration of the fluid medium. Step S32: Set multiple temperature monitoring points on different components of the magnetic energy-saving pump, and collect the real-time temperature values of the temperature monitoring points at the acquisition moment. Step S33: Calculate the actual change temperature of the fluid medium at the acquisition moment, and then obtain the corresponding varying temperature field. Read the simulated temperature values at the corresponding positions of the temperature monitoring points according to the varying temperature field. Step S34: Compare the real-time temperature value and the simulated temperature value corresponding to the same temperature monitoring point, calculate the difference between the real-time temperature value and the simulated temperature value, and take the absolute value, which is recorded as the monitoring temperature difference.

[0013] Furthermore, the step S3 also includes: Step S35: Compare the monitoring temperature difference with the temperature difference threshold. If the temperature monitoring difference of any one temperature monitoring point is greater than or equal to the temperature difference threshold, an abnormal signal is generated. Step S36: If the temperature monitoring differences of all temperature monitoring points are greater than the temperature difference threshold, add up all the temperature monitoring differences and take the average value to obtain the average temperature monitoring difference. Compare the average temperature monitoring difference with the average temperature difference threshold. When the average temperature monitoring difference is greater than or equal to the average temperature difference threshold, an abnormal signal is generated. When the average temperature monitoring difference is less than the average temperature difference threshold, it is determined that the accuracy rate of the varying temperature field is qualified, and the subsequent steps are carried out. Step S37: If an abnormal signal is generated, it is determined that the accuracy rate of the varying temperature field is unqualified, and a new varying temperature field is generated.

[0014] Furthermore, the step S4 includes the following sub-steps: Step S41: Obtain the material types of different components of the electromagnetic energy-saving pump, and read the corresponding material thermal expansion coefficient α according to the material type. Step S42: Collect the real-time ambient temperature SHW, and read the real-time temperature value SWDn of any coordinate point in the electromagnetic energy-saving pump according to the varying temperature field. Here, n is the number of any coordinate point in the magnetic energy-saving pump, n = 1, 2,..., j, and j is a positive integer. Step S43: According to the law of thermal expansion, thermal strain is proportional to temperature. Therefore, the thermal strain RLn of the coordinate point can be obtained as RLn = α × (SWDn - SHW). Step S44: Calculate the thermal stress of multiple coordinate points corresponding to the same component, add them up and take the average value as the thermal stress RYLp of the corresponding component of the magnetic energy-saving pump, where p is the number of different components. Step S45: Integrate the thermal stress with respect to the axial force to obtain the calculated axial force JZZ corresponding to the magnetic energy-saving pump. The specific formula is as follows: ; ; where JZLp is the calculated axial force of different components, R is the cross-sectional area of the impeller, and u is the upper limit value of p.

[0015] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are as follows: 1. The present invention first collects the component contours and material types of different components in the magnetic energy-saving pump; then constructs a three-dimensional model of the magnetic energy-saving pump based on the component contours of different components, and solves the variable temperature field of the magnetic energy-saving pump according to the material types of different components; furthermore, compares the surface temperature measured by an infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field; the present invention realizes the determination of the corresponding variable temperature field of the magnetic energy-saving pump. 2. The present invention conducts a structural mechanics analysis on the magnetic energy-saving pump to obtain the corresponding thermal stress of the magnetic energy-saving pump, and obtains the calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; finally, judges the tolerance of the thrust disc according to the calculated axial force and issues an alarm; the present invention realizes the accurate calculation of the calculated axial force corresponding to the magnetic energy-saving pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] For the convenience of those skilled in the art to understand, the present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 is the overall method flow block diagram of the present invention; Figure 2 is the structural schematic diagram of the magnetic energy-saving pump in the present invention; Figure 3 is the structural schematic diagram of the computer device in the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Example 1, please refer to Figure 1 and Figure 2 as shown. The technical solution provided by the present invention is: a method for measuring the axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment, as Figure 2As shown in the figure, the magnetic energy-saving pump is composed of an impeller, a shielding cover, an outer magnetic cylinder, an inner magnetic cylinder, a thrust disc, a bearing box, a coupling and an electric motor. Among them, the axial force in the magnetic energy-saving pump is mainly generated by the pressure difference on both sides of the impeller, and its direction is along the axis of the pump shaft. The axial force will be transmitted along the pump shaft and finally act on the bearing. In this embodiment, the magnetic energy-saving pump under steady-state temperature conditions and dynamic temperature conditions is thermally analyzed to solve the distribution of the temperature field under the corresponding temperature conditions. Then, through differential operation, the relationship between the temperature field of the magnetic energy-saving pump and the change of the fluid medium temperature is obtained. Then, taking the distribution of the temperature field as an input item, the magnetic energy-saving pump is structurally analyzed to obtain the thermal stress, and then the thermal stress is integrated to obtain the corresponding axial force of the magnetic energy-saving pump. In the present invention, the method for measuring the axial force is specifically as follows: Step S1: Collect the part profiles and material types of different components in the magnetic energy-saving pump. Among them, the different components include: impeller, pump casing, outer magnetic cylinder, inner magnetic cylinder and bearing box. Step S2: Construct a three-dimensional model of the magnetic energy-saving pump based on the part profiles of different components, and solve the variable temperature field of the magnetic energy-saving pump according to the material types of different components. In the present invention, step S2 includes the following sub-steps: Step S21: Obtain the part profiles of different components in the magnetic energy-saving pump. Step S22: Collect the CAD drawings of the magnetic energy-saving pump, and construct a three-dimensional geometric model of the magnetic energy-saving pump in combination with the part profiles of different components. When specifically modeling, details such as bolt holes and chamfers are ignored. Step S23: Establish a three-dimensional coordinate system with the geometric center of the magnetic energy-saving pump as the origin, and only regard the magnetic energy-saving pump as an effective coordinate point in the three-dimensional coordinate system. Step S24: Solve the temperature field of the magnetic energy-saving pump under steady-state temperature conditions. Among them, the steady-state temperature condition means that the fluid medium transported in the magnetic energy-saving pump is at a constant temperature and regarded as the ambient temperature. In the present invention, the solution process of the temperature field corresponding to the magnetic energy-saving pump under the steady-state temperature condition is specifically as follows: Step S241: Collect the ambient temperature HW of the environment where the magnetic energy-saving pump is located and the actual temperature BW of the corresponding outer shell surface of the magnetic energy-saving pump. Step S242: Calculate the external heat convection WR of the corresponding outer shell surface of the magnetic energy-saving pump based on Newton's law of cooling. The specific formula is as follows: WR = h×(BW - HW); in the formula, h is the convective heat transfer coefficient, which represents the heat transferred through surface convection per unit area and unit temperature difference; the positive and negative of the external heat source only represent the direction of heat flow. Step S243, then collect the impeller rotation speed ZS, impeller diameter ZJ of the impeller in the magnetic energy-saving pump, and the medium density ρ and effective cross-sectional area JMJ of the fluid medium; Among them, the effective cross-sectional area refers to the minimum cross-sectional area actually passed when the fluid medium flows in the magnetic energy-saving pump; if the magnetic energy-saving pump is a circular pipe, the effective cross-sectional area is the inner diameter cross-sectional area; if the magnetic energy-saving pump is a rectangular pipe, the effective cross-sectional area is the width × height of the rectangular pipe; if there are structures such as blades and guide plates in the pipe, the thickness of the blades or guide plates needs to be deducted according to the actual flow space, and then the area is adjusted; Step S244, calculate the convective heat transfer MR at the impeller through the formula. The specific formula is as follows: ; In the formula, μ is the dynamic viscosity of the fluid medium, which characterizes the ability of the fluid medium to resist shear deformation; Step S245, consider the heat transfer of the magnetic energy-saving pump in the steady temperature state as uniform, and solve T1 through the formula to obtain the temperature at any point in the temperature field. The specific formula is: ▽×(k▽T1)+MR + WR = 0; In the formula, k is the thermal conductivity, which characterizes the ability to conduct heat; ▽ is the gradient operator, which represents the spatial variation of the temperature field; Step S25, solve the temperature field of the magnetic energy-saving pump in the dynamic temperature state; among them, the dynamic temperature state means that the fluid medium transported in the magnetic energy-saving pump is a variable temperature; In the present invention, the solution process of the temperature field corresponding to the magnetic energy-saving pump in the dynamic temperature state is specifically as follows: Step S251, set the total temperature change value WBZ and temperature change duration WSC of the fluid medium; Step S252, divide the temperature change duration into multiple temperature change intervals, and record the number of each group as i, i = 1, 2,..., z, where z is a positive integer; Step S253, for any temperature change interval, obtain the temperature change rate of the corresponding temperature change interval by subtracting the temperature value corresponding to the left endpoint from the temperature value corresponding to the right endpoint and dividing by the interval duration; Step S254, record the temperature values of multiple coordinate points in the magnetic energy-saving pump at the end of the temperature change interval, and calculate the difference between the corresponding temperature value and the ambient temperature. Divide the difference by the interval duration to obtain the temperature change rate of the corresponding coordinate point; Step S255, obtain the proportionality coefficient of the corresponding coordinate point by dividing the temperature change rate of any coordinate point by the temperature change rate of the temperature change interval; calculate the remaining proportionality coefficient of the corresponding coordinate point according to the remaining temperature change intervals; Sum up all the proportionality coefficients corresponding to the same coordinate point and take the average value to obtain the average proportionality coefficient of the corresponding coordinate point; calculate the standard deviation of the proportionality coefficient corresponding to the corresponding coordinate point according to the average proportionality coefficient; Take the mean of the proportionality coefficients plus the standard deviation of the proportionality coefficients as the right endpoint, and take the mean of the proportionality coefficients minus the standard deviation of the proportionality coefficients as the left endpoint to obtain the screening interval; remove the proportionality coefficients outside the screening interval, and sum the remaining proportionality coefficients to obtain the optimized proportionality coefficients for the corresponding coordinate points; similarly, calculate the optimized proportionality coefficients for all coordinate points according to the temperature change interval. Step S256, synthesize all the optimized proportionality coefficients to obtain the relationship between the temperature change of all positions in the temperature field corresponding to the electromagnetic energy-saving pump and the temperature change of the fluid medium; denoted as LTW = λ × WDC; where, LTW is the temperature value of the fluid medium, WDC is the temperature value of any point in the temperature field corresponding to the electromagnetic energy-saving pump, and λ is the optimized proportionality coefficient. Step S257, solve for T2 through the formula to obtain the temperature of any point in the temperature field. The specific formula is: ; in the formula, ρ2 is the density of different components corresponding to the electromagnetic energy-saving pump, C is the constant-pressure specific heat capacity of different components corresponding to the electromagnetic energy-saving pump, representing the heat required for unit mass of solid to increase the temperature by 1K, and DMR is the frictional heat convection at the impeller of the electromagnetic energy-saving pump in the dynamic temperature state. Step S26, obtain the variable temperature field affected by the temperature change of the fluid medium by taking the difference between the temperature field of the magnetic energy-saving pump in the dynamic temperature state and the temperature field of the magnetic energy-saving pump in the steady temperature state. Step S27, superimpose the variable temperature field with the three-dimensional coordinate system to obtain the variable temperature field corresponding to different coordinate points of the magnetic energy-saving pump. Step S3, compare the surface temperature measured by the infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field. In the present invention, the step S3 includes the following sub-steps: Step S31, inject the actual fluid medium into the magnetic energy-saving pump, and set the actual change temperature and temperature change duration of the fluid medium. Step S32, set multiple temperature monitoring points on different components of the magnetic energy-saving pump, and collect the real-time temperature values of the temperature monitoring points at the acquisition moment. Step S33, calculate the actual change temperature of the fluid medium at the acquisition moment, and then obtain the corresponding variable temperature field. Read the simulated temperature value at the position corresponding to the temperature monitoring point according to the variable temperature field. Directly read the optimized proportionality coefficient corresponding to the coordinate point and the center position of the variable temperature field through the position coordinates of the coordinate point, and obtain the simulated temperature value by multiplying the optimized proportionality coefficient by the actual change temperature of the fluid medium. It should be noted that the variable temperature field is a physical concept that describes the temperature distribution in a spatial region, reflecting the variation law of temperature in space, that is, the proportional relationship of temperature values between different coordinate points in space and the central position of the variable temperature field (i.e., the actual changing temperature of the fluid medium); Step S34: Compare the real-time temperature value corresponding to the same temperature monitoring point with the simulated temperature value, calculate the difference between the real-time temperature value and the simulated temperature value, and record the absolute value as the monitoring temperature difference; Step S35: Compare the monitoring temperature difference with the temperature difference threshold. If the temperature monitoring difference of any one temperature monitoring point is greater than or equal to the temperature difference threshold, an abnormal signal is generated; Step S36: If the temperature monitoring differences of all temperature monitoring points are greater than the temperature difference threshold, sum up all the temperature monitoring differences and take the average value to obtain the average temperature monitoring difference; compare the average temperature monitoring difference with the average temperature difference threshold. When the average temperature monitoring difference is greater than or equal to the average temperature difference threshold, an abnormal signal is generated; when the average temperature monitoring difference is less than the average temperature difference threshold, it is determined that the accuracy rate of the variable temperature field is qualified, and the subsequent steps are carried out; Step S37: If an abnormal signal is generated, it is determined that the accuracy rate of the variable temperature field is unqualified, and the variable temperature field is regenerated.

[0020] Step S4: Conduct a structural mechanics analysis on the magnetic energy-saving pump to obtain the thermal stress corresponding to the magnetic energy-saving pump, and calculate the axial force based on the thermal stress corresponding to the magnetic energy-saving pump; In the present invention, the said Step S4 includes the following sub-steps: Step S41: Obtain the material types of different components of the electromagnetic energy-saving pump, and read the corresponding material thermal expansion coefficient α according to the material type; Step S42: Collect the real-time ambient temperature SHW, and read the real-time temperature value SWDn of any coordinate point in the electromagnetic energy-saving pump according to the variable temperature field; where n is the number of any coordinate point in the magnetic energy-saving pump, n = 1, 2,..., j, and j is a positive integer; Step S43: According to the law of thermal expansion, it can be known that thermal strain is proportional to temperature. Therefore, the thermal strain RLn of the coordinate point can be obtained as RLn = α × (SWDn - SHW); Step S44: Calculate the thermal stress of multiple coordinate points corresponding to the same component, sum them up and take the average value as the thermal stress RYLp of the corresponding component of the magnetic energy-saving pump, where p is the number of different components; Step S45: Integrate the thermal stress to obtain the calculated axial force JZZ of the corresponding magnetic energy-saving pump. The specific formula is as follows: ; ; In the formula, JZLp is the calculated axial force of different components, R is the cross-sectional area of the impeller, and u is the upper limit value of p; Step S5: Determine the tolerance of the thrust disk based on the calculated axial force and issue an alarm. Specifically, for the thrust disk, compare the calculated axial force with the maximum force that the thrust disk can withstand. If the calculated axial force is greater than or equal to the maximum force of the thrust disk, generate an alarm signal; if the calculated axial force is less than the maximum force of the thrust disk, no operation is performed.

[0021] In this application, if there are corresponding calculation formulas, the above calculation formulas are all calculated by taking the numerical values without considering the dimensions. For the coefficients such as the weight coefficient and the proportionality coefficient in the formula, the magnitudes set are for obtaining a result value by quantifying each parameter. Regarding the magnitudes of the weight coefficient and the proportionality coefficient, as long as the proportional relationship between the parameters and the result value is not affected.

[0022] Embodiment 2 Figure 3 It is a schematic structural diagram of a computer device, which may include: a processor, a communication interface, a memory, and a communication bus. Among them, the processor, the communication interface, and the memory complete mutual communication through the communication bus. The processor can call the logical instructions in the memory to execute a method for measuring the axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment. The method includes: collecting the component profiles and material types of different components in the magnetic energy-saving pump; constructing a three-dimensional model of the magnetic energy-saving pump based on the component profiles of different components, and solving the varying temperature field of the magnetic energy-saving pump based on the material types of different components; comparing the surface temperature measured by an infrared thermal imager with the simulated temperature value of the varying temperature field to determine the accuracy of the varying temperature field; performing a structural mechanics analysis on the magnetic energy-saving pump to obtain the thermal stress corresponding to the magnetic energy-saving pump, and obtaining the calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; determining the tolerance of the thrust disk based on the calculated axial force and issuing an alarm.

[0023] In addition, when the above logical instructions in the memory are implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. And the aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs and other various media that can store program codes.

[0024] On the other hand, the present application also provides a computer program product. The computer program product includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute a method for measuring the axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment provided by each of the above methods. The method includes: collecting the component profiles and material types of different components in the magnetic energy-saving pump; constructing a three-dimensional model of the magnetic energy-saving pump according to the component profiles of different components, and solving the variable temperature field of the magnetic energy-saving pump according to the material types of different components; comparing the surface temperature measured by an infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field; performing a structural mechanics analysis on the magnetic energy-saving pump to obtain the thermal stress corresponding to the magnetic energy-saving pump, and obtaining the calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; judging the tolerance of the thrust disc according to the calculated axial force and giving an alarm.

[0025] In another aspect, the present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is implemented to execute a method for measuring the axial force of a magnetic energy-saving pump in an instantaneous high temperature difference environment provided by each of the above. The method includes: collecting the component profiles and material types of different components in the magnetic energy-saving pump; constructing a three-dimensional model of the magnetic energy-saving pump according to the component profiles of different components, and solving the variable temperature field of the magnetic energy-saving pump according to the material types of different components; comparing the surface temperature measured by an infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field; performing a structural mechanics analysis on the magnetic energy-saving pump to obtain the thermal stress corresponding to the magnetic energy-saving pump, and obtaining the calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; judging the tolerance of the thrust disc according to the calculated axial force and giving an alarm.

[0026] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative labor.

[0027] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the essence of the above technical solution, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to enable a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0028] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. Step S1, collecting component profiles and material types of different components in the magnetic energy-saving pump; Step S2, constructing a three-dimensional model of the magnetic energy-saving pump according to the component contours of different components, and solving the variable temperature field of the magnetic energy-saving pump according to the material types of different components; Step S3, comparing the surface temperature measured by the infrared thermal imager with the simulated temperature value of the variable temperature field to determine the accuracy of the variable temperature field; Step S4, performing structural mechanics analysis on the magnetic energy-saving pump to obtain thermal stress corresponding to the magnetic energy-saving pump, and obtaining a calculated axial force corresponding to the magnetic energy-saving pump based on the thermal stress; Step S5, judging the tolerance of the thrust plate based on the calculated axial force and issuing an alarm.

2. According to claim 1, a method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment is characterized in that: The step S2 includes the following sub-steps: Step S21, obtaining component profiles of different components in the magnetic energy-saving pump; Step S22, collecting CAD drawings of the magnetic energy-saving pump, and building a three-dimensional geometric model of the magnetic energy-saving pump in combination with the component contours of different components; Step S23, establishing a three-dimensional coordinate system with the geometric center of the magnetic energy-saving pump as the origin, and the three-dimensional coordinate system only regards the magnetic energy-saving pump as a valid coordinate point; Step S24, solving the temperature field of the magnetic energy-saving pump under a steady temperature state; Step S25, solving the temperature field of the magnetic energy-saving pump under the dynamic temperature state Step S26, obtaining a variable temperature field affected by the temperature change of the fluid medium by differentiating the temperature field of the magnetic energy-saving pump in a dynamic temperature state from the temperature field of the magnetic energy-saving pump in a steady temperature state; Step S27, superimposing the variable temperature field with the three-dimensional coordinate system to obtain the variable temperature field of the magnetic energy-saving pump corresponding to different coordinate points.

3. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 2 is characterized in that: Steady temperature state means that the fluid medium transported in the magnetic energy-saving pump is at a constant temperature and is regarded as the ambient temperature; The dynamic temperature state means that the fluid medium transported in the magnetic energy-saving pump is of variable temperature.

4. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 2 is characterized in that: The specific solution process of the temperature field corresponding to the magnetic energy-saving pump under the steady-state temperature state is as follows: Step S241, collecting the ambient temperature HW of the environment where the magnetic energy-saving pump is located and the actual temperature BW of the surface of the shell corresponding to the magnetic energy-saving pump; Step S242, based on Newton's cooling law, the external heat convection WR of the magnetic energy-saving pump corresponding to the shell surface is calculated, and the specific formula is as follows: WR=h×(BW-HW); where h is the convective heat transfer coefficient; Step S243, then collect the impeller speed ZS, impeller diameter ZJ of the impeller in the magnetic energy-saving pump, and the medium density ρ and effective cross-sectional area JMJ of the fluid medium.

5. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 4 is characterized in that: The process of solving the temperature field corresponding to the magnetic energy-saving pump under the steady-state temperature state also includes: Step S244, calculate the friction heat convection MR at the impeller by using the formula, the specific formula is as follows: ; In the formula, μ is the dynamic viscosity of the fluid medium; Step S245, the heat transfer of the magnetic energy-saving pump in the steady-state temperature state is considered to be uniform, and the temperature of any point in the temperature field can be obtained by solving T1 by the formula, and the specific formula is: ▽×(k▽T1)+MR+WR=0; where k is the thermal conductivity and ▽ is the gradient operator.

6. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 2 is characterized in that: The specific solution process of the temperature field corresponding to the magnetic energy-saving pump under the dynamic temperature state is as follows: Step S251, setting the total temperature change value WBZ and the temperature change duration WSC of the fluid medium; Step S252, dividing the temperature change duration into multiple groups of temperature change intervals, and numbering each group as i, where i=1, 2, ..., z, where z is a positive integer; Step S253, for any set of temperature change intervals, the temperature change rate of the corresponding temperature change interval is obtained by subtracting the temperature value corresponding to the left endpoint from the temperature value corresponding to the right endpoint and dividing by the interval duration; Step S254, recording the temperature values ​​of multiple coordinate points in the magnetic energy-saving pump at the end of the temperature change interval, and calculating the difference between the corresponding temperature value and the ambient temperature, and obtaining the temperature change rate of the corresponding coordinate point by dividing the difference by the interval duration.

7. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 6 is characterized in that: The process of solving the temperature field corresponding to the magnetic energy-saving pump under the dynamic temperature state also includes: Step S255, obtaining the proportionality coefficient of the corresponding coordinate point by dividing the temperature change rate of any coordinate point by the temperature change rate of the temperature change interval; calculating the remaining proportionality coefficient of the corresponding coordinate point according to the remaining temperature change interval; adding and averaging all the proportionality coefficients corresponding to the same coordinate point to obtain the mean of the proportionality coefficients of the corresponding coordinate point; and calculating the standard deviation of the proportionality coefficients corresponding to the corresponding coordinate point according to the mean of the proportionality coefficients; The mean of the proportional coefficient plus the standard deviation of the proportional coefficient is taken as the right endpoint, and the mean of the proportional coefficient minus the standard deviation of the proportional coefficient is taken as the left endpoint to obtain the screening interval; the proportional coefficients outside the screening interval are removed, and the remaining proportional coefficients are added and summed to obtain the optimized proportional coefficients of the corresponding coordinate points; similarly, the optimized proportional coefficients of all coordinate points are calculated according to the temperature change interval; Step S256, synthesizing all optimized proportional coefficients, obtaining the relationship between the temperature change of all positions in the temperature field corresponding to the electromagnetic energy-saving pump and the temperature change of the fluid medium; recorded as LTW=λ×WDC; wherein LTW is the temperature value of the fluid medium, WDC is the temperature value of any point in the temperature field corresponding to the electromagnetic energy-saving pump, and λ is the optimized proportional coefficient; Step S257, the temperature of any point in the temperature field can be obtained by solving T2 through the formula, and the specific formula is: ; In the formula, ρ2 is the density of different components of the electromagnetic energy-saving pump, C is the constant-pressure specific heat capacity of different components of the electromagnetic energy-saving pump, and DMR is the friction heat convection at the impeller of the electromagnetic energy-saving pump under dynamic temperature conditions.

8. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 1 is characterized in that: The step S3 includes the following sub-steps: Step S31, injecting actual fluid medium into the magnetic energy-saving pump, and setting the actual change temperature and temperature change duration of the fluid medium; Step S32, setting a plurality of temperature monitoring points on different components of the magnetic energy-saving pump, and collecting real-time temperature values ​​of the temperature monitoring points at the collection time; Step S33, calculating the actual temperature change of the fluid medium at the time of acquisition, and then obtaining the corresponding variable temperature field, and reading the simulated temperature value of the corresponding position of the temperature monitoring point according to the variable temperature field; Step S34, comparing the real-time temperature value and the simulated temperature value corresponding to the same temperature monitoring point, calculating the difference between the real-time temperature value and the simulated temperature value, taking the absolute value and recording it as the monitored temperature difference.

9. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 8, characterized in that: The step S3 further comprises: Step S35, monitoring the temperature difference and comparing it with the temperature difference threshold, if the temperature monitoring difference of any temperature monitoring point is greater than or equal to the temperature difference threshold, an abnormal signal is generated; Step S36, if the temperature monitoring differences of all temperature monitoring points are greater than the temperature difference threshold, then all temperature monitoring differences are added and averaged to obtain the temperature monitoring average difference; the temperature monitoring average difference is compared with the temperature monitoring average difference threshold, and when the temperature monitoring average difference is greater than or equal to the temperature monitoring average difference threshold, an abnormal signal is generated; when the temperature monitoring average difference is less than the temperature monitoring average difference threshold, it is determined that the accuracy of the variable temperature field is qualified, and the subsequent steps are performed; Step S37: if an abnormal signal is generated, it is determined that the accuracy of the variable temperature field is unqualified, and the variable temperature field is regenerated.

10. The method for measuring the axial force of a magnetic energy-saving pump under an instantaneous high temperature difference environment according to claim 1, characterized in that: The step S4 includes the following sub-steps: Step S41, obtaining the material types of different components of the electromagnetic energy-saving pump, and reading the corresponding material thermal expansion coefficient α according to the material type; Step S42, collecting the real-time ambient temperature SHW, and reading the real-time temperature value SWDn of any coordinate point in the electromagnetic energy-saving pump according to the variable temperature field; wherein n is the number of any coordinate point in the magnetic energy-saving pump, n=1, 2, ... j, j is a positive integer; Step S43, according to the law of thermal expansion, thermal strain is proportional to temperature, so the thermal strain of the coordinate point RLn=α×(SWDn-SHW); Step S44, calculating the thermal stress of multiple coordinate points corresponding to the same component, and adding and taking the average value as the thermal stress RYLp of the corresponding component of the magnetic energy-saving pump, where p is the number of different components; Step S45, the axial force integration of the thermal stress is performed to obtain the calculated axial force JZZ of the corresponding magnetic energy-saving pump, and the specific formula is as follows: ; ; In the formula, JZLp is the calculated axial force of different components, R is the cross-sectional area of ​​the impeller, and u is the upper limit value of p.

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