Pump device performance curve determination method and device and terminal

Abstract

The invention provides a method and device for determining a performance curve of a pump device and a terminal, and the method comprises the steps: obtaining a plurality of performance test sample data sets of the pump device under the same impeller diameter value and the same pump device rotating speed value, so as to determine a performance parameter association relation of the pump device under the impeller diameter value and the pump device rotating speed value; the method comprises the following steps: acquiring a power-rotating speed relationship between motor output power and motor rotating speed of a motor adopted in a pump device, and calculating the rotating speed value of the pump device according to the rotating speed value of the pump device, the power-rotating speed relationship and a fluid mechanical similarity conversion principle; determining values of corresponding power parameters and values of other performance parameters of the pump device under the condition that the rotating speed of the pump device is different from the rotating speed value of the pump device, and further determining a performance curve of the pump device; the relation among the performance parameters of the pump device under other rotating speed values can be obtained through the relation among the performance parameters of the pump device under a certain rotating speed value, then the full characteristic curve data of the pump device can be obtained, and testing resources and testing cost are saved.

Description

Technical Field

[0001] The present application relates to the technical field of pump device performance analysis, and in particular to a method, device and terminal for determining a pump device performance curve. Background Art

[0002] Centrifugal pumps are essential basic equipment for inter-basin and regional water transfer, agricultural irrigation and drainage, industrial cooling circulation, and urban water supply and drainage. Their hydraulic performance is directly related to the operational safety and engineering benefits of water supply and drainage systems. At present, the hydraulic performance of centrifugal pumps can be further analyzed through their performance curves. Therefore, how to determine the performance curve of centrifugal pumps has become a technical problem that needs to be solved urgently. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a method, device and terminal for determining a performance curve of a pump device to solve the above-mentioned technical problems.

[0004] In one aspect, a method for determining a performance curve of a pump device is provided, the method comprising:

[0005] Acquire multiple performance test sample data sets of the pump device under the same impeller diameter value and the same pump device speed value; each of the performance test sample data sets includes the value of the power parameter and the value of other performance parameters of the pump device; the other performance parameters include at least one of a flow parameter and a head parameter;

[0006] Determine the performance parameter association relationship of the pump device at the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups; the performance parameter association relationship includes a first parameter association relationship, and the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the other performance parameters;

[0007] Obtaining a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device;

[0008] Determining a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship;

[0009] Determine the value of the other performance parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the performance parameter;

[0010] According to the power value of the pump device, the values ​​of the other performance parameters corresponding to the power value of the pump device and the principle of fluid mechanical similarity conversion, determine the value of the power parameter and the values ​​of the other performance parameters corresponding to the pump device at a pump device speed different from the pump device speed value;

[0011] The performance curve of the pump device is determined according to the value of the power parameter and the values ​​of the other performance parameters of the pump device at different pump device rotation speeds.

[0012] In one embodiment, determining the correlation relationship between the performance parameters of the pump device at the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups includes:

[0013] Substituting the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the values ​​of the other performance parameters into a preset polynomial fitting model for calculation, to obtain a fitting coefficient corresponding to the polynomial fitting model;

[0014] Substitute the fitting coefficients into the polynomial fitting model to obtain corresponding performance parameter association relationships.

[0015] In one embodiment, the other performance parameters include a first parameter and a second parameter, the first parameter is the flow parameter, and the second parameter is the head parameter; or, the first parameter is the head parameter, and the second parameter is the flow parameter;

[0016] The first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the first parameter, and the performance parameter association relationship also includes a second parameter association relationship, and the second parameter association relationship is used to indicate the relationship between the value of the first parameter of the pump device and the value of the second parameter;

[0017] The determining the value of the other performance parameter corresponding to the pump device power value according to the association relationship between the pump device power value and the performance parameter comprises:

[0018] Determine the value of the first parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the first parameter;

[0019] The value of the second parameter corresponding to the power value of the pump device is determined according to the association relationship between the value of the first parameter corresponding to the power value of the pump device and the second parameter.

[0020] In one embodiment, the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the values ​​of the other performance parameters are substituted into a preset polynomial fitting model for calculation to obtain a fitting coefficient corresponding to the polynomial fitting model, including:

[0021] Substituting the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the first parameter value into a preset first polynomial fitting model for calculation to obtain a first fitting coefficient corresponding to the first polynomial fitting model;

[0022] Substitute the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the second parameter value into a preset second polynomial fitting model for calculation to obtain a second fitting coefficient corresponding to the second polynomial fitting model.

[0023] In one embodiment, the first polynomial fitting model is:

[0024] D=a1+a2*A+a3*P+a4*A 2 +a5*A*P+a6*P 2 +a7*A 3 +a8*A 2 *P+

[0025] a9*A*P 2 +a10*P 3 +a11*A 4 +a12*A 3 *P+a13*A 2 *P 2 +a14*A*P 3 +a15*P 4 ;

[0026] The second polynomial fitting model is:

[0027] D=b1+b2*A+b3*B+b4*A 2 +b5*A*B+b6*B 2 +b7*A 3 +b8*A 2 *B+

[0028] b9*A*B 2 +b10*B 3 +b11*A 4 +b12*A 3 *B+b13*A 2 *B 2 +b14*A*B 3 +b15*B 4 ;

[0029] Among them, D represents the impeller diameter value, A represents the first parameter, P represents the power parameter, B represents the second parameter, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14 and a15 represent the first fitting coefficients, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14 and b15 represent the second fitting coefficients.

[0030] In one embodiment, the determining, based on the pump device power value, the values ​​of the other performance parameters corresponding to the pump device power value, and the fluid mechanical similarity conversion principle, the value of the power parameter and the value of the other performance parameters corresponding to the pump device at a pump device speed different from the pump device speed value comprises:

[0031] According to the pump device power value and formula calculating a value of the power parameter of the pump device corresponding to a pump device speed different from the pump device speed value;

[0032] According to the value of the head parameter corresponding to the power value of the pump device and the formula Calculating the value of the head parameter corresponding to a pump device speed different from the pump device speed value;

[0033] According to the value of the flow parameter corresponding to the power value of the pump device and the formula Calculating a value of the flow parameter corresponding to a pump device speed different from the pump device speed value;

[0034] Among them, P 0 Indicates the power value of the pump device, H 0 represents the value of the head parameter corresponding to the power value of the pump device, Q 0 represents the value of the flow parameter corresponding to the power value of the pump device, n 0 Indicates the speed value of the pump device, n i represents a value of the pump speed different from the pump speed value, P i Indicates that the pump device is at a speed n i The corresponding power parameter value, H i Indicates that the pump device is at a speed n i The value of the lift parameter corresponding to the following is Q i Indicates that the pump device is at a speed n i The value of the traffic parameter corresponding to the following.

[0035] In one embodiment, the step of obtaining the power-speed relationship between the motor output power and the motor speed of the motor used in the pump device includes:

[0036] Acquire multiple calibration data sets of the motor used in the pump device; each calibration data set includes a value of a calibrated output power and a value of a calibrated rotational speed of the motor;

[0037] A power-speed relationship between the motor output power and the motor speed of the motor is determined according to the calibration data set and a preset power-speed correlation model.

[0038] In one embodiment, the power-speed correlation model is a linear model.

[0039] In another aspect, a device for determining a performance curve of a pump device is provided, comprising:

[0040] A first acquisition module is used to acquire a plurality of performance test sample data groups of the pump device under the same impeller diameter value and the same pump device speed value; each of the performance test sample data groups includes the value of the power parameter and the value of other performance parameters of the pump device; the other performance parameters include at least one of a flow parameter and a head parameter;

[0041] A first determination module is used to determine the performance parameter association relationship of the pump device under the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups; the performance parameter association relationship includes a first parameter association relationship, and the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the other performance parameters;

[0042] A second acquisition module, used to acquire a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device;

[0043] A second determination module is used to determine a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship;

[0044] A third determination module, configured to determine the value of the other performance parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the performance parameter;

[0045] A fourth determination module, for determining the value of the power parameter and the value of the other performance parameter of the pump device corresponding to a pump device speed different from the pump device speed value according to the pump device power value, the value of the other performance parameter corresponding to the pump device power value and the fluid mechanical similarity conversion principle;

[0046] The fifth determination module is used to determine the performance curve of the pump device according to the value of the power parameter and the values ​​of the other performance parameters of the pump device at different pump device rotation speeds.

[0047] On the other hand, a terminal is provided, including a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement any of the above methods.

[0048] The present application provides a method, device and terminal for determining a performance curve of a pump device, by obtaining a plurality of performance test sample data groups of the pump device at the same impeller diameter value and the same pump device speed value, determining the performance parameter correlation relationship of the pump device at the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups, obtaining the power-speed relationship between the motor output power and the motor speed of the motor used in the pump device, determining the pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship, determining the values ​​of other performance parameters corresponding to the pump device power value according to the pump device power value and the performance parameter correlation relationship, and determining the pump device power value, the power parameter correlation relationship between the pump device power value and the pump device power value, and the power parameter correlation relationship between the pump device power value and the pump device power value. The values ​​of other performance parameters corresponding to the values ​​and the similar conversion principle of fluid machinery are used to determine the values ​​of power parameters and other performance parameters corresponding to the pump device at a pump device speed different from the pump device speed value; the performance curve of the pump device is determined according to the values ​​of power parameters and other performance parameters of the pump device at different pump device speeds; the relationship between the performance parameters of the pump device at other speed values ​​can be obtained through the relationship between the performance parameters of the pump device at a certain speed value, and then the full characteristic curve data of the pump device can be obtained. In the present application, the sample data of the pump device variant is obtained through limited performance test sample data. This process saves testing resources and testing costs and shortens the product development life cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 A schematic flow chart of a method for determining a performance curve of a pump device provided in Example 1 of the present application;

[0050] Figure 2 A first fitting schematic diagram provided for Example 1 of the present application;

[0051] Figure 3 A second fitting schematic diagram provided in Example 1 of the present application;

[0052] Figure 4 A schematic diagram of the structure of a device for determining a performance curve of a pump device provided in Example 2 of the present application;

[0053] Figure 5 This is a schematic diagram of the structure of the terminal provided in Example 3 of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] Embodiment 1:

[0056] The present application embodiment provides a method for determining a pump device performance curve, which is applied to a terminal. For details, see Figure 1 As shown, the following steps may be included:

[0057] S101: Acquire multiple performance test sample data sets of a pump device at the same impeller diameter value and the same pump device rotation speed value.

[0058] Each performance test sample data group includes the value of the power parameter of the pump device and the value of other performance parameters; the other performance parameters include at least one of a flow parameter and a head parameter.

[0059] S102: Determine, based on a plurality of performance test sample data groups, a correlation relationship between performance parameters of the pump device at the impeller diameter value and the pump device rotation speed value.

[0060] The performance parameter association relationship in the embodiment of the present application includes a first parameter association relationship, and the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the values ​​of other performance parameters.

[0061] S103: Obtaining a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device.

[0062] S104: Determine a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship.

[0063] S105: Determine values ​​of other performance parameters corresponding to the power value of the pump device according to the correlation between the power value of the pump device and the performance parameters.

[0064] S106: According to the power value of the pump device, the values ​​of other performance parameters corresponding to the power value of the pump device and the principle of fluid mechanical similarity conversion, determine the value of the power parameter and other performance parameters corresponding to the pump device at a pump device speed different from the pump device speed value.

[0065] S107: Determine a performance curve of the pump device according to the values ​​of the power parameters and other performance parameters of the pump device at different pump device rotation speeds.

[0066] The following is a detailed introduction to the above steps.

[0067] The pump device in the embodiment of the present application may be a centrifugal pump. It is understandable that the method for determining the performance curve of the pump device provided in the embodiment of the present application may also be applied to other types of pumps.

[0068] The performance parameters of the pump device in the embodiment of the present application may be any parameters that can affect the performance of the pump device, including but not limited to impeller diameter, rotation speed, power, head, and flow parameters.

[0069] In step S101, the impeller diameter and rotation speed of a certain type of pump device can be fixed, and then a performance test can be performed to obtain multiple performance sample test data groups, thereby obtaining multiple performance test sample data groups for the pump device at the same impeller diameter value and the same pump device rotation speed value, and then these data are input into the terminal for subsequent determination of the performance curve of the pump device.

[0070] Each performance test sample data set includes the value of the power parameter and other performance parameter values ​​of the pump device, and the other performance parameters include flow parameters and / or head parameters. Exemplarily, for the pump device whose performance curve is to be determined, the impeller diameter of the pump device is set to D 0 , the speed is set to n 0 The performance test was carried out and the pump device was found to have an impeller diameter of D 0 , the pump speed value is n 0 Under multiple performance test sample data groups, for example, multiple performance test sample data groups are obtained as {P 1 ,Q 1 ,H 1}、{P 2 ,Q 2 ,H 2}、{P 3 ,Q 3 ,H 3}、{P 4 ,Q 4 ,H 4}.

[0071] For step S102, the impeller diameter value, the power parameter values ​​in multiple performance test sample data groups, and the values ​​of other performance parameters can be substituted into a preset polynomial fitting model for calculation to obtain a fitting coefficient corresponding to the polynomial fitting model, and the fitting coefficient is substituted into the polynomial fitting model to obtain the corresponding performance parameter association relationship.

[0072] In step S103, the power-speed relationship may be stored in advance in the terminal. Generally speaking, the power-speed relationship of a standard motor can be directly obtained according to the model of the motor. If the power-speed relationship is not pre-stored on the terminal side, the power-speed relationship between the motor output power and the motor speed of the motor used in the pump device may be calculated in the following manner:

[0073] Sub-step 1: Acquire multiple calibration data sets of the motor used in the pump device; each calibration data set includes the value of the calibrated output power and the value of the calibrated speed of the motor.

[0074] Sub-step 2: Determine the power-speed relationship between the motor output power and the motor speed of the motor according to the calibration data set and a preset power-speed correlation model.

[0075] The power-speed correlation model preset in the embodiment of the present application may be a linear model, for example, y=dx+e, where y represents the motor power, x represents the motor speed, and d and e represent the coefficients of the power-speed correlation model. It is understandable that other types of models may also be used as the power-speed correlation model in other embodiments.

[0076] Specifically, in sub-step 1, two sets of calibration data groups can be obtained, and the two sets of calibration data groups are substituted into the power-speed correlation model y=dx+e to obtain the values ​​of coefficients d and e, and then the obtained values ​​of coefficients d and e are substituted into y=dx+e to obtain the power-speed relationship. In this way, the power-speed relationship of a special pump device under a specific motor type can be obtained.

[0077] It should be noted that the motor power here can be the output effective power of the motor or the input power of the motor. When the motor power here is the output effective power, the corresponding power parameters in step S101 represent the output power parameters of the pump device. When the motor power here is the input power of the motor, the corresponding power parameters in step S101 represent the input power parameters of the pump device.

[0078] When it is necessary to establish a performance curve relationship between speed-power-head-flow, the other performance parameters in step S101 need to include flow parameters and head parameters. Specifically, the following implementation methods may be included:

[0079] In a first optional implementation, the performance parameter association relationship includes not only the first parameter association relationship but also the second parameter association relationship, wherein the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the first parameter, and the second parameter association relationship is used to indicate the relationship between the value of the first parameter and the value of the second parameter of the pump device. The first parameter is a flow parameter and the second parameter is a head parameter; or the first parameter is a head parameter and the second parameter is a flow parameter.

[0080] Based on the first implementation manner described above, step S105 may include the following sub-steps:

[0081] Sub-step 1: Determine the value of the first parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the first parameter.

[0082] Sub-step 2: Determine the value of the second parameter corresponding to the power value of the pump device according to the association relationship between the value of the first parameter corresponding to the power value of the pump device and the second parameter.

[0083] Here, a specific method of determining the first parameter association relationship and the second parameter association relationship in this embodiment is described.

[0084] In this embodiment, the impeller diameter value, the power parameter values ​​in multiple performance test sample data groups and the corresponding first parameter value can be substituted into a preset first polynomial fitting model for calculation to obtain a first fitting coefficient corresponding to the first polynomial fitting model, and the first fitting coefficient is substituted into the first polynomial fitting model, so that the first parameter association relationship can be obtained.

[0085] Similarly, the impeller diameter value, the power parameter values ​​in multiple performance test sample data groups and the corresponding second parameter values ​​can be substituted into the preset second polynomial fitting model for calculation to obtain the second fitting coefficient corresponding to the second polynomial fitting model, and the second fitting coefficient can be substituted into the second polynomial fitting model to obtain the second parameter association relationship.

[0086] Exemplarily, the first polynomial fitting model in this embodiment may be:

[0087] D=a1+a2*A+a3*P+a4*A 2 +a5*A*P+a6*P 2 +a7*A 3 +a8*A 2 *P+

[0088] a9*A*P 2 +a10*P 3 +a11*A 4 +a12*A 3*P+a13*A 2 *P 2 +a14*A*P 3 +a15*P 4 ;

[0089] The second polynomial fitting model can be:

[0090] D=b1+b2*A+b3*B+b4*A 2 +b5*A*B+b6*B 2 +b7*A 3 +b8*A 2 *B+

[0091] b9*A*B 2 +b10*B 3 +b11*A 4 +b12*A 3 *B+b13*A 2 *B 2 +b14*A*B 3 +b15*B 4 ;

[0092] Among them, D represents the impeller diameter value, A represents the first parameter, P represents the power parameter, B represents the second parameter, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14 and a15 represent the first fitting coefficients, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14 and b15 represent the second fitting coefficients.

[0093] For ease of understanding, the first parameter is the flow parameter and the second parameter is the head parameter. At this time, in step S102, the impeller diameter value, the power parameter value in the plurality of performance test sample data groups and the corresponding flow parameter value in step S101 can be substituted into the preset first polynomial fitting model for calculation to obtain the first fitting coefficient corresponding to the first polynomial fitting model, and the first fitting coefficient is substituted into the first polynomial fitting model, so that the first parameter correlation relationship can be obtained. The corresponding fitting schematic diagram can be seen in Figure 2 As shown, Figure 2The relationship between the flow parameter value and the power parameter value under different impeller diameter values ​​is shown in FIG. 1 . Similarly, the impeller diameter value in step S101, the power parameter value in multiple performance test sample data groups, and the corresponding head parameter value can be substituted into the preset second polynomial fitting model for calculation to obtain the second fitting coefficient corresponding to the second polynomial fitting model, and the second fitting coefficient is substituted into the second polynomial fitting model to obtain the second parameter association relationship. The corresponding fitting schematic diagram can be seen in FIG. Figure 3 As shown, Figure 3 The relationship between the values ​​of the flow parameter and the head parameter at different impeller diameter values ​​is shown in FIG.

[0094] The first polynomial fit model in this example is:

[0095] D=a1+a2*Q+a3*P+a4*Q 2 +a5*Q*P+a6*P 2 +a7*Q 3 +a8*Q 2 *P+

[0096] a9*Q*P 2 +a10*P 3 +a11*Q 4 +a12*Q 3 *P+a13*Q 2 *P 2 +a14*Q*P 3 +a15*P 4 ;

[0097] The second polynomial fit model in this example is:

[0098] D=b1+b2*Q+b3*H+b4*Q 2 +b5*Q*H+b6*H 2 +b7*Q 3 +b8*Q 2 *H+

[0099] b9*Q*H 2 +b10*H 3 +b11*Q 4 +b12*Q 3 *H+b13*Q 2 *H 2 +b14*Q*H 3 +b15*H 4 ;

[0100] Among them, D represents the impeller diameter value, Q represents the flow parameter, P represents the power parameter, H represents the head parameter, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14 and a15 represent the first fitting coefficients, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14 and b15 represent the second fitting coefficients.

[0101] Correspondingly, in step S105, the value of the flow parameter corresponding to the pump device power value can be determined according to the association between the pump device power value and the first parameter. The value of the head parameter corresponding to the pump device power value can be determined according to the association between the pump device power value and the second parameter.

[0102] The above describes the specific contents of the performance parameter association relationship including the first parameter association relationship and the second parameter association relationship. The following describes an implementation method in which the performance parameter association relationship only includes the first parameter association relationship.

[0103] In a second optional embodiment, the performance parameter association relationship includes two first parameter association relationships, one of which is used to indicate the relationship between the value of the power parameter of the pump device and the value of the flow parameter, and the other is used to indicate the relationship between the value of the power parameter of the pump device and the value of the head parameter. In step S102 of this embodiment, the two first parameter association relationships in this embodiment can be obtained by referring to the method of determining the first parameter association relationship in the first embodiment. In step S105 of this embodiment, the two first parameter association relationships can be directly used to directly obtain the value of the flow parameter and the value of the head parameter corresponding to the power value of the pump device in step S104.

[0104] When the other performance parameters include flow parameters and lift parameters, step S106 may include the following sub-steps:

[0105] Sub-step 1: Based on the pump device power value and formula A value of a power parameter of the pump device corresponding to a pump device rotation speed different from the pump device rotation speed value is calculated.

[0106] Sub-step 2: Based on the value of the head parameter corresponding to the pump device power value and the formula The value of the head parameter corresponding to the pump device rotation speed different from the pump device rotation speed value is calculated.

[0107] Sub-step 3: Based on the value of the flow parameter corresponding to the pump device power value and the formula The value of the flow rate parameter corresponding to the pump device rotation speed different from the pump device rotation speed value is calculated.

[0108] Among them, P 0 represents the pump device power value obtained in step S104, H 0 Indicates the value of the head parameter corresponding to the power value of the pump device, Q 0 Indicates the value of the flow parameter corresponding to the power value of the pump device, n 0 Indicates the pump speed value, n i represents a value of the pump speed different from the pump speed value, P i Indicates the pump device at a speed n i The corresponding power parameter value, H i Indicates the pump device at speed n i The corresponding lift parameter value, Q i Indicates the pump device at a speed n i The corresponding traffic parameter value is as follows.

[0109] It is understandable that, in step S106, a random algorithm or other algorithm may be used to generate a plurality of speed values ​​n corresponding to the pump device. 0 Different speed values, and then for each speed value, according to the above-mentioned fluid mechanical similarity conversion principle, that is, according to the formula The power parameter, head parameter and flow parameter corresponding to each speed value are obtained by reverse calculation. 0 The pump device corresponds to {P 0 ,H 0 ,Q 0}, the speed n can be obtained according to the similarity conversion principle of fluid machinery i The corresponding {P i ,H i ,Q i}.

[0110] Each set of speed value, power parameter value, head parameter value, flow parameter value and impeller direct value D 0 As a target data set, the impeller diameter value here is the impeller diameter value mentioned in step S101, and multiple data sets {D 0 ,n i ,P i ,H i ,Q i} as the independent variable, the pump device can be fitted with the impeller diameter value D 0 The performance curve under the impeller diameter value D 0 The relationship between the speed, power parameters, head parameters and flow parameters.

[0111] It should be noted that in step S101, the performance test sample data groups corresponding to the multiple different impeller diameter values ​​can be obtained respectively. For the performance test sample data groups corresponding to each impeller diameter value, the above steps S102 to S107 are executed to obtain the performance curves corresponding to each impeller diameter value. The collection of each performance curve is the performance surface. According to the performance surface, the standard performance curve under the conditions of any impeller diameter value and the required motor power within the range of the surface can be obtained. For example, it can be combined with the formula The efficiency value of the pump device is calculated, where η represents the hydraulic efficiency of the pump device, ρ represents the density of the liquid transported by the pump device, and P1 represents the input power of the motor used by the pump device.

[0112] The method for determining the performance curve of a pump device provided in the embodiment of the present application obtains sample data of variants of the pump device through limited performance test sample data, thereby saving test resources and test costs and shortening the life cycle of product development.

[0113] It should be understood that, although the various steps in the above-mentioned flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above-mentioned flow chart may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0114] Embodiment 2:

[0115] Based on the same inventive concept, the present application embodiment provides a device for determining a performance curve of a pump device, see Figure 4 As shown, including:

[0116] The first acquisition module 401 is used to acquire a plurality of performance test sample data sets of the pump device under the same impeller diameter value and the same pump device speed value; each of the performance test sample data sets includes the value of the power parameter and other performance parameter values ​​of the pump device; the other performance parameters include at least one of a flow parameter and a head parameter;

[0117] A first determination module 402 is used to determine the performance parameter association relationship of the pump device under the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups; the performance parameter association relationship includes a first parameter association relationship, and the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the other performance parameters;

[0118] A second acquisition module 403 is used to acquire a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device;

[0119] A second determination module 404 is used to determine a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship;

[0120] A third determination module 405, for determining the value of the other performance parameter corresponding to the pump device power value according to the association relationship between the pump device power value and the performance parameter;

[0121] A fourth determination module 406 is used to determine the value of the power parameter and the value of the other performance parameter corresponding to the pump device at a pump device speed different from the pump device speed value according to the pump device power value, the value of the other performance parameter corresponding to the pump device power value and the fluid mechanical similarity conversion principle;

[0122] The fifth determination module 407 is used to determine the performance curve of the pump device according to the value of the power parameter and the values ​​of the other performance parameters of the pump device at different pump device rotation speeds.

[0123] Furthermore, the first determination module 402 is used to substitute the impeller diameter value, the value of the power parameter in the multiple performance test sample data groups, and the value of the other performance parameters into a preset polynomial fitting model for calculation to obtain a fitting coefficient corresponding to the polynomial fitting model; substitute the fitting coefficient into the polynomial fitting model to obtain a corresponding performance parameter association relationship.

[0124] Further, the other performance parameters include a first parameter and a second parameter, the first parameter is the flow parameter, and the second parameter is the head parameter; or, the first parameter is the head parameter, and the second parameter is the flow parameter; the first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the first parameter, and the performance parameter association relationship also includes a second parameter association relationship, and the second parameter association relationship is used to indicate the relationship between the value of the first parameter of the pump device and the value of the second parameter; the third determination module 405 is used to determine the value of the first parameter corresponding to the power value of the pump device according to the power value of the pump device and the first parameter association relationship; determine the value of the second parameter corresponding to the power value of the pump device according to the value of the first parameter corresponding to the power value of the pump device and the second parameter association relationship.

[0125] Furthermore, the first determination module 402 is used to substitute the impeller diameter value, the values ​​of the power parameters in the multiple performance test sample data groups, and the value of the first parameter into a preset first polynomial fitting model for calculation, so as to obtain a first fitting coefficient corresponding to the first polynomial fitting model; and substitute the impeller diameter value, the values ​​of the power parameters in the multiple performance test sample data groups, and the value of the second parameter into a preset second polynomial fitting model for calculation, so as to obtain a second fitting coefficient corresponding to the second polynomial fitting model.

[0126] Furthermore, the first polynomial fitting model is:

[0127] D=a1+a2*A+a3*P+a4*A 2 +a5*A*P+a6*P 2 +a7*A 3 +a8*A 2 *P+

[0128] a9*A*P 2 +a10*P 3 +a11*A 4 +a12*A 3 *P+a13*A 2 *P 2 +a14*A*P 3 +a15*P 4 ;

[0129] The second polynomial fitting model is:

[0130] D=b1+b2*A+b3*B+b4*A 2 +b5*A*B+b6*B 2 +b7*A 3 +b8*A2 *B+

[0131] b9*A*B 2 +b10*B 3 +b11*A 4 +b12*A 3 *B+b13*A 2 *B 2 +b14*A*B 3 +b15*B 4 ;

[0132] Among them, D represents the impeller diameter value, A represents the first parameter, P represents the power parameter, B represents the second parameter, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14 and a15 represent the first fitting coefficients, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14 and b15 represent the second fitting coefficients.

[0133] Further, the fourth determination module 406 is used to determine the pump device power value according to the formula Calculate the value of the power parameter of the pump device at a pump device speed different from the pump device speed value; and calculate the value of the head parameter corresponding to the pump device power value according to the formula Calculate the value of the head parameter corresponding to the pump device speed different from the pump device speed value; and calculate the value of the flow parameter corresponding to the pump device power value according to the formula Calculate the value of the flow parameter corresponding to the pump device speed different from the pump device speed value; wherein, P 0 Indicates the power value of the pump device, H 0 represents the value of the head parameter corresponding to the power value of the pump device, Q 0 represents the value of the flow parameter corresponding to the power value of the pump device, n 0 Indicates the speed value of the pump device, n i represents a value of the pump speed different from the pump speed value, P i Indicates that the pump device is at a speed n i The corresponding power parameter value, H i Indicates that the pump device is at a speed n i The value of the lift parameter corresponding to the following is Q i Indicates that the pump device is at a speed n i The value of the traffic parameter corresponding to the following.

[0134] Furthermore, the second acquisition module 403 is used to acquire multiple calibration data groups of the motor used in the pump device; each of the calibration data groups includes the value of the calibrated output power and the value of the calibrated speed of the motor; and the power-speed relationship between the motor output power and the motor speed of the motor is determined based on the calibration data group and a preset power-speed association model.

[0135] Furthermore, the power-speed correlation model is a linear model.

[0136] It should be noted that, for the sake of brevity, the contents described in the above embodiments will not be repeated in this embodiment.

[0137] Embodiment three:

[0138] Based on the same inventive concept, the present application embodiment provides a terminal 500, see Figure 5 As shown, the terminal 500 includes a processor 501 and a memory 502, in which a computer program is stored. The processor 501 and the memory 502 communicate via a communication bus, and the processor 501 executes the computer program to implement the steps of the method in the above-mentioned embodiment 1 and embodiment 2, which will not be repeated here.

[0139] Understandably, Figure 5 The structure shown is for illustration only. The terminal may also include Figure 5 More or fewer components as shown, or with Figure 5 Different configurations shown.

[0140] The processor 501 may be an integrated circuit chip with signal processing capabilities. The processor 501 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. It may implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0141] The memory 502 may include, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable read-only memory (EPROM), electrically erasable read-only memory (EEPROM), etc.

[0142] This embodiment also provides a computer-readable storage medium, such as a floppy disk, a CD, a hard disk, a flash memory, a USB flash disk, an SD card, an MMC card, etc., in which one or more programs for implementing the above steps are stored. The one or more programs can be executed by one or more processors 501 to implement the steps of the method in the above embodiment 1, which will not be repeated here.

[0143] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be a random change, and the component layout type may also be more complicated. The structure, ratio, size, etc. illustrated in the drawings of the present specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0144] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0145] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A method for determining a performance curve of a pump device, characterized in that: include: Acquire multiple performance test sample data groups of the pump device under the same impeller diameter value and the same pump device speed value; Each of the performance test sample data sets includes the value of the power parameter of the pump device and the value of other performance parameters; the other performance parameters include at least one of a flow parameter and a head parameter; Determine the correlation relationship between the performance parameters of the pump device at the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups; The performance parameter association relationship includes a first parameter association relationship, the first parameter association relationship being used to indicate a relationship between a value of a power parameter of the pump device and a value of the other performance parameter; Obtaining a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device; Determining a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship; Determine the value of the other performance parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the performance parameter; According to the power value of the pump device, the values ​​of the other performance parameters corresponding to the power value of the pump device and the principle of fluid mechanical similarity conversion, determine the value of the power parameter and the values ​​of the other performance parameters corresponding to the pump device at a pump device speed different from the pump device speed value; The performance curve of the pump device is determined according to the value of the power parameter and the values ​​of the other performance parameters of the pump device at different pump device rotation speeds.

2. The method for determining a pump device performance curve according to claim 1, characterized in that: Determining the correlation relationship between the performance parameters of the pump device at the impeller diameter value and the pump device speed value according to the plurality of performance test sample data groups includes: Substituting the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the values ​​of the other performance parameters into a preset polynomial fitting model for calculation, to obtain a fitting coefficient corresponding to the polynomial fitting model; Substitute the fitting coefficients into the polynomial fitting model to obtain corresponding performance parameter association relationships.

3. The method for determining a pump device performance curve according to claim 2, characterized in that: The other performance parameters include a first parameter and a second parameter, the first parameter is the flow parameter, and the second parameter is the head parameter; or, the first parameter is the head parameter, and the second parameter is the flow parameter; The first parameter association relationship is used to indicate the relationship between the value of the power parameter of the pump device and the value of the first parameter, and the performance parameter association relationship also includes a second parameter association relationship, and the second parameter association relationship is used to indicate the relationship between the value of the first parameter of the pump device and the value of the second parameter; The determining the value of the other performance parameter corresponding to the pump device power value according to the association relationship between the pump device power value and the performance parameter comprises: Determine the value of the first parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the first parameter; The value of the second parameter corresponding to the power value of the pump device is determined according to the association relationship between the value of the first parameter corresponding to the power value of the pump device and the second parameter.

4. The method for determining a pump device performance curve according to claim 3, characterized in that: Substituting the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the values ​​of the other performance parameters into a preset polynomial fitting model for calculation to obtain a fitting coefficient corresponding to the polynomial fitting model includes: Substituting the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the first parameter value into a preset first polynomial fitting model for calculation to obtain a first fitting coefficient corresponding to the first polynomial fitting model; Substitute the impeller diameter value, the power parameter values ​​in the plurality of performance test sample data groups, and the second parameter value into a preset second polynomial fitting model for calculation to obtain a second fitting coefficient corresponding to the second polynomial fitting model.

5. The method for determining a pump device performance curve according to claim 4, characterized in that: The first polynomial fitting model is: <h2 style=";text-align:left;direction:ltr">D = a1 + a2 * A + a3 * P + a4 * A<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +a5*A*P+a6*P<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> +a7*A<h2 style=";text-align:left;direction:ltr"> 3 <h2 style=";text-align:left;direction:ltr"> +a8*A<h2 style=";text-align:left;direction:ltr"> 2 <h2 style=";text-align:left;direction:ltr"> *P+ a9*A*P 2 +a10*P 3 +a11*A 4 +a12*A 3 *P+a13*A 2 *P 2 +a14*A*P 3 +a15*P 4 ; The second polynomial fitting model is: D=b1+b2*A+b3*B+b4*A 2 +b5*A*B+b6*B 2 +b7*A 3 +b8*A 2 *B+ b9*A*B 2 +b10*B 3 +b11*A 4 +b12*A 3 *B+b13*A 2 *B 2 +b14*A*B 3 +b15*B 4 ; Among them, D represents the impeller diameter value, A represents the first parameter, P represents the power parameter, B represents the second parameter, a1, a2, a3, a4, a5, a6, a7, a8, a9, a10, a11, a12, a13, a14 and a15 represent the first fitting coefficients, b1, b2, b3, b4, b5, b6, b7, b8, b9, b10, b11, b12, b13, b14 and b15 represent the second fitting coefficients.

6. The method for determining a pump device performance curve according to claim 3, characterized in that: The method of determining the value of the power parameter and the value of the other performance parameter corresponding to the pump device at a pump device speed different from the pump device speed value according to the pump device power value, the values ​​of the other performance parameters corresponding to the pump device power value, and the fluid mechanical similarity conversion principle includes: According to the pump device power value and formula calculating a value of the power parameter of the pump device corresponding to a pump device speed different from the pump device speed value; According to the value of the head parameter corresponding to the power value of the pump device and the formula Calculating the value of the head parameter corresponding to a pump device speed different from the pump device speed value; According to the value of the flow parameter corresponding to the power value of the pump device and the formula Calculating a value of the flow parameter corresponding to a pump device speed different from the pump device speed value; Wherein, P0 represents the power value of the pump device, H0 represents the value of the head parameter corresponding to the power value of the pump device, Q0 represents the value of the flow parameter corresponding to the power value of the pump device, n0 represents the speed value of the pump device, n i represents a value of the pump speed different from the pump speed value, P i Indicates that the pump device is at a speed n i The corresponding power parameter value, H i Indicates that the pump device is at a speed n i The corresponding value of the lift parameter, Q i Indicates that the pump device is at a speed n i The value of the traffic parameter corresponding to the following.

7. The method for determining a pump device performance curve according to claim 1, characterized in that: The obtaining of the power-speed relationship between the motor output power and the motor speed of the motor used in the pump device comprises: Acquire multiple calibration data sets of the motor used in the pump device; each calibration data set includes a value of a calibrated output power and a value of a calibrated rotational speed of the motor; A power-speed relationship between the motor output power and the motor speed of the motor is determined according to the calibration data set and a preset power-speed correlation model.

8. The method for determining a pump device performance curve according to claim 7, characterized in that: The power-speed correlation model is a linear model.

9. A device for determining a performance curve of a pump device, characterized in that: include: A first acquisition module is used to acquire a plurality of performance test sample data groups of the pump device under the same impeller diameter value and the same pump device speed value; Each of the performance test sample data sets includes the value of the power parameter of the pump device and the value of other performance parameters; the other performance parameters include at least one of a flow parameter and a head parameter; A first determination module, configured to determine, based on a plurality of the performance test sample data groups, a correlation relationship between the performance parameters of the pump device at the impeller diameter value and the pump device rotation speed value; The performance parameter association relationship includes a first parameter association relationship, the first parameter association relationship being used to indicate a relationship between a value of a power parameter of the pump device and a value of the other performance parameter; A second acquisition module, used to acquire a power-speed relationship between a motor output power and a motor speed of a motor used in the pump device; A second determination module is used to determine a pump device power value corresponding to the pump device speed value according to the pump device speed value and the power-speed relationship; A third determination module, configured to determine the value of the other performance parameter corresponding to the power value of the pump device according to the association relationship between the power value of the pump device and the performance parameter; A fourth determination module, for determining the value of the power parameter and the value of the other performance parameter of the pump device corresponding to a pump device speed different from the pump device speed value according to the pump device power value, the value of the other performance parameter corresponding to the pump device power value and the fluid mechanical similarity conversion principle; The fifth determination module is used to determine the performance curve of the pump device according to the value of the power parameter and the values ​​of the other performance parameters of the pump device at different pump device rotation speeds.

10. A terminal, characterized in that: The method comprises a processor and a memory, wherein a computer program is stored in the memory, and the processor executes the computer program to implement the method according to any one of claims 1 to 8.

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