Performance detection method and device for gear flow pump of dialysis machine

Abstract

A performance testing method and apparatus for a gear flow pump used in a dialysis machine are disclosed. The performance testing method includes: acquiring standard performance parameters of the gear flow pump under test; controlling the gear flow pump under test to operate under a combination of multiple preset speeds and multiple preset load paths; under each combination of operating conditions, collecting the inlet pressure, outlet pressure, and actual output flow of the gear flow pump under test; establishing a correspondence between the actual output flow and the absolute value of the actual inlet and outlet pressure difference of the gear flow pump at each preset speed; extracting the actual theoretical flow coefficient and the actual leakage coefficient of the gear flow pump under test based on the correspondence between the actual output flow and the absolute value of the actual inlet and outlet pressure difference; comparing the actual theoretical flow coefficient with the standard theoretical flow coefficient and the actual leakage coefficient with the standard leakage coefficient, respectively, and outputting the performance evaluation result of the gear flow pump under test based on the comparison results.

Description

Technical Field

[0001] This invention relates to the field of dialysis machine technology, and in particular to a method and apparatus for testing the performance of a gear flow pump used in dialysis machines. Background Technology

[0002] Hemodialysis machines are essential medical devices used for extracorporeal blood purification in patients with renal failure. The gear flow pump in a hemodialysis machine is a key fluid delivery component, responsible for delivering dialysate or related fluids at a set flow rate to ensure the stability and accuracy of the dialysate supply. For dialysis treatment, the flow stability, pressure adaptability, and long-term operational reliability of the dialysate flow pump directly affect the adequacy of dialysis and the safety of the treatment.

[0003] Given the unique working pressure and flow rate of gear flow pumps used in dialysis machines, there is a lack of technical means in the market to test the performance of gear flow pumps used in dialysis machines. How to test the performance of gear flow pumps used in dialysis machines has become a technical problem that urgently needs to be solved in the industry. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a performance testing method and apparatus for gear flow pumps used in dialysis machines, thereby solving the problem of performance testing for gear flow pumps used in dialysis machines.

[0005] To achieve the above objectives, this application provides a performance testing method for a gear flow pump used in a dialysis machine, comprising: Obtain the standard performance parameters of the gear flow pump under test. The standard performance parameters include the standard theoretical flow coefficient and the standard leakage coefficient. The gear flow pump under test is controlled to operate under a combination of multiple preset speeds and multiple preset load paths, wherein the multiple preset load paths are load paths with different equivalent pipeline resistances. Under each operating condition, the inlet pressure, outlet pressure, and actual output flow of the gear flow pump under test are collected, and the absolute value of the actual inlet and outlet pressure difference is determined based on the inlet and outlet pressures. Establish the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference of the gear flow pump under test at each preset speed; Based on the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test are extracted. The actual theoretical flow coefficient is compared with the standard theoretical flow coefficient, and the actual leakage coefficient is compared with the standard leakage coefficient. Based on the comparison results, the performance evaluation results of the gear flow pump under test are output.

[0006] Preferably, the step of establishing the correspondence between the actual output flow rate of the geared flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference includes: At the same preset speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load channels to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ; in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

[0007] Preferably, the average theoretical flow coefficient is obtained by averaging the theoretical flow coefficients at multiple preset speeds; The theoretical flow deviation rate is determined based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient. The average leakage coefficient is obtained by averaging the actual leakage coefficients at multiple preset speeds. The leakage growth rate is determined based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

[0008] Preferably, the formula for calculating the leakage growth rate is: ; in, The leakage growth rate; The average leakage coefficient of the gear pump under test; The standard leakage coefficient; The formula for calculating the theoretical flow deviation rate is: ; in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; This is the standard theoretical flow coefficient.

[0009] Preferably, it further includes: Calculate the goodness of fit of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and determine the average goodness of fit based on the goodness of fit under multiple preset speeds. The average goodness of fit is used to evaluate the linearity of the response between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference. Based on the degree of dispersion of the leakage coefficient obtained at multiple preset speeds, a leakage coefficient speed consistency index is determined. The leakage coefficient rotational speed consistency index is used to evaluate the consistency of the leakage coefficient at different rotational speeds.

[0010] Preferably, the wear type or abnormality type of the gear flow pump under test is identified based on at least two of the following: theoretical flow deviation rate, leakage growth rate, average goodness of fit, and leakage coefficient speed consistency index. Wear types or abnormalities include increased axial clearance, gear wear, increased radial clearance, localized damage to tooth surfaces, abnormal sealing, and air ingress or air bubbles in pipelines.

[0011] To achieve the above objectives, embodiments of the present invention also provide a performance testing device for a gear flow pump used in a dialysis machine, comprising: Liquid circulation module, used to provide circulation test liquid path; The drive module is used to drive the gear flow pump under test to operate at multiple preset speeds; The pipeline load formation and pressure measurement module is used to form multiple preset load paths with different equivalent pipeline resistances on the outlet side of the gear flow pump under test, and to collect the inlet pressure and outlet pressure of the gear flow pump under test. The data acquisition module is used to collect the actual output flow of the gear flow pump under test under various combined operating conditions; The data processing module is used to determine the absolute value of the actual inlet and outlet pressure difference based on the inlet and outlet pressures, and to establish the correspondence between the actual output flow rate of the gear flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference. The data processing module is also used to extract the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test based on the correspondence between the actual output flow rate and the actual absolute value of the inlet and outlet pressure difference. It compares the actual theoretical flow coefficient with the standard theoretical flow coefficient of the gear flow pump under test and the actual leakage coefficient with the standard leakage coefficient of the gear flow pump under test, and outputs the performance evaluation result of the gear flow pump under test based on the comparison results.

[0012] Preferably, establishing the correspondence between the actual output flow rate of the geared flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference further includes: At the same preset speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load channels to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ; in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

[0013] Preferably, the data processing module is also used to average the theoretical flow coefficients at multiple preset speeds to obtain the average theoretical flow coefficient; The theoretical flow deviation rate is determined based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient. The average leakage coefficient is obtained by averaging the actual leakage coefficients at multiple preset speeds. The leakage growth rate is determined based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

[0014] Preferably, the formula for calculating the leakage growth rate is: ; in, The leakage growth rate; The average leakage coefficient of the gear pump under test; The standard leakage coefficient; The formula for calculating the theoretical flow deviation rate is: ; in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; This is the standard theoretical flow coefficient.

[0015] Preferably, the data processing module is also used to calculate the goodness of fit of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and to determine the average goodness of fit based on the goodness of fit under multiple preset speeds. The average goodness of fit is used to evaluate the linearity of the response between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference. Based on the degree of dispersion of the leakage coefficient obtained at multiple preset speeds, a leakage coefficient speed consistency index is determined. The leakage coefficient rotational speed consistency index is used to evaluate the consistency of the leakage coefficient at different rotational speeds.

[0016] Preferably, the data processing module is also used to identify the wear type or abnormality type of the gear flow pump under test based on at least two of the following: theoretical flow deviation rate, leakage growth rate, average goodness of fit, and leakage coefficient speed consistency index. Wear types or abnormalities include increased axial clearance, gear wear, increased radial clearance, localized damage to tooth surfaces, abnormal sealing, and air ingress or air bubbles in pipelines.

[0017] The above technical solution not only solves the problem of testing the performance of gear flow pumps used in dialysis machines, but also makes the test data more accurate; it can accurately judge various abnormal conditions of gear flow pumps.

[0018] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present application and form part of the specification. Together with the embodiments of the present application, they serve to explain the present application but do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic flowchart of a performance testing method for a gear flow pump for a dialysis machine according to an embodiment of this application; Figure 2 This is a schematic diagram of the performance testing device for a gear flow pump for a dialysis machine according to an embodiment of this application. Detailed Implementation

[0020] The preferred embodiments of this application are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0021] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0022] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0023] It should be noted that the terms "first" and "second" may be used in this application only to distinguish different devices, components or parts, and are not used to define the order of functions performed by these devices, components or parts or their interdependence.

[0024] It should be noted that the terms "one" and "more" used in this application are illustrative rather than restrictive, and those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "More" should be understood as two or more.

[0025] The performance testing method for the gear flow pump used in dialysis machines disclosed in this application includes: Obtain the standard performance parameters of the gear flow pump under test. The standard performance parameters include the standard theoretical flow coefficient and the standard leakage coefficient. The gear flow pump under test is controlled to operate under a combination of multiple preset speeds and multiple preset load paths, wherein the multiple preset load paths are load paths with different equivalent pipeline resistances. Under each operating condition, the inlet pressure, outlet pressure, and actual output flow of the gear flow pump under test are collected, and the absolute value of the actual inlet and outlet pressure difference is determined based on the inlet and outlet pressures. Establish the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference of the gear flow pump under test at each preset speed; Based on the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test are extracted. The actual theoretical flow coefficient is compared with the standard theoretical flow coefficient, and the actual leakage coefficient is compared with the standard leakage coefficient. Based on the comparison results, the performance evaluation results of the gear flow pump under test are output.

[0026] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0027] Example 1 Figure 1 This is a schematic flowchart of a performance testing method for a gear flow pump for a dialysis machine according to an embodiment of this application. Figure 1 As shown in the embodiment of this application, the performance testing method for a gear flow pump used in a dialysis machine is used to test the performance of the gear flow pump used in a dialysis machine, such as whether it has a fault, and if so, what the cause is.

[0028] First, in step 101, the standard performance parameters of the gear flow pump under test are obtained. The standard performance parameters include the standard theoretical flow coefficient and the standard leakage coefficient.

[0029] In one exemplary embodiment, the corresponding standard performance parameters are obtained according to the model of the gear flow pump under test; if necessary, the standard performance parameters may be pre-stored information, for example, this information is set in a storage unit.

[0030] In one exemplary embodiment, if the standard performance parameters corresponding to the model of the gear flow pump under test are not pre-stored, standard performance parameters for that model of gear flow pump can be established. The specific method for establishing these parameters is as follows: Control the same model of new gear flow pump to operate under combined operating conditions formed by multiple preset speeds and multiple preset load paths; collect the actual absolute values ​​of the inlet and outlet pressure differences and the actual output flow rate of the same model of new gear flow pump under each combined operating condition; establish a correspondence between flow rate and pressure difference based on the actual absolute values ​​of the inlet and outlet pressure differences and the actual output flow rate of the same model of new gear flow pump under each preset speed; obtain the theoretical flow coefficient and leakage coefficient of the same model of new gear flow pump according to the correspondence between flow rate and pressure difference; determine the standard theoretical flow coefficient and standard leakage coefficient based on the theoretical flow coefficient and leakage coefficient of the same model of new gear flow pump. To establish standard performance parameters, at least two same model of new gear flow pumps can be used for separate testing, or one same model of new gear flow pump can be used for at least two rounds of repeated testing, and the standard performance parameters can be determined based on at least two valid test results.

[0031] In one exemplary implementation, the standard theoretical flow coefficient, also known as the fitted zero-pressure flow coefficient, can be understood as data calculated by fitting new gear flow pump test data.

[0032] Step 102: Control the gear flow pump under test to operate under a combination of multiple preset speeds and multiple preset load paths, wherein the multiple preset load paths are load paths with different equivalent pipeline resistances.

[0033] In one exemplary embodiment, the preset load path can be formed by one or more of the following: a throttle valve, a fixed throttle orifice, a damping pipeline, a multi-way solenoid valve, a fixed flow limiter, a proportional valve, a servo valve, or a manual regulating valve.

[0034] Step 103: Under each combination of operating conditions, collect the inlet pressure, outlet pressure, and actual output flow of the gear flow pump under test, and determine the absolute value of the actual inlet and outlet pressure difference based on the inlet pressure and outlet pressure.

[0035] In one exemplary embodiment, the collected data is obtained as needed under specified test liquid, specified test temperature, and specified pipeline structure conditions, all of which refer to the operating environment specifications of the gear flow pump under test.

[0036] In one exemplary embodiment, the absolute value of the actual inlet and outlet pressure difference is the absolute value of the difference between the inlet pressure and the outlet pressure. Since the outlet pressure is the rear end of the gear flow pump being tested, its pressure value is definitely positive. The inlet pressure is obtained from the front end of the gear flow pump being tested. Moreover, since the water tank is connected to the atmosphere, the outlet pressure minus the inlet pressure under the suction effect of the gear flow pump being tested is definitely a positive value. That is, the absolute value of the actual inlet and outlet pressure difference is still equal to the outlet pressure minus the inlet pressure.

[0037] In one exemplary embodiment, to improve data accuracy, multiple sets of inlet pressure, outlet pressure, actual output flow rate, and actual rotational speed data can be collected, and statistical processing can be performed on each set of data to obtain the average absolute value of the actual inlet-outlet pressure difference, the average output flow rate, and the average actual rotational speed under the combined operating conditions. Using the average absolute value of the actual inlet-outlet pressure difference, the average output flow rate, and the average actual rotational speed instead of the individually collected inlet pressure, outlet pressure, actual output flow rate, and actual rotational speed data can improve the accuracy of the parameters.

[0038] In one exemplary implementation, when it is necessary to calculate the average absolute value of the actual inlet and outlet pressure difference, the average value of multiple actual inlet and outlet pressure difference absolute values ​​is used.

[0039] Step 104: Establish the correspondence between the actual output flow rate of the gear flow pump under test and the absolute value of the actual inlet and outlet pressure difference at each preset speed.

[0040] In one exemplary embodiment, at the same preset rotational speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load channels to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ; in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

[0041] Step 105: Based on the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, extract the actual theoretical flow coefficient and the actual leakage coefficient of the gear flow pump under test.

[0042] In one exemplary embodiment, the theoretical flow coefficients at multiple preset speeds are averaged to obtain an average theoretical flow coefficient; the theoretical flow deviation rate is determined based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient; and the actual leakage coefficients at multiple preset speeds are averaged to obtain an average leakage coefficient. The leakage growth rate is determined based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

[0043] In one exemplary embodiment, the formula for calculating the leakage growth rate is: ; in, The leakage growth rate; The average leakage coefficient of the gear pump under test; The standard leakage coefficient; The formula for calculating the standard leakage coefficient is: ; in, The average leakage coefficient; The number of valid tests; The formula for calculating the theoretical flow deviation rate is: ; in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; The standard theoretical flow coefficient; The formula for calculating the standard theoretical flow coefficient is: ; in, For the first The average theoretical flow coefficient corresponding to each valid test result; The number of valid tests.

[0044] In one exemplary implementation, the actual theoretical flow coefficient is calculated in the same way as the standard theoretical flow coefficient. The difference is that the actual theoretical flow coefficient is calculated by fitting the test data of the gear flow pump being tested. In other words, this lays the foundation for subsequent comparison and judgment between the test data of the gear flow pump being tested and the data obtained from the new gear flow pump test.

[0045] In one exemplary embodiment, the method further includes: calculating the goodness of fit of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and determining the average goodness of fit based on the goodness of fit at multiple preset speeds; the average goodness of fit is used to evaluate the linearity of the response of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference; and determining the leakage coefficient speed consistency index based on the dispersion of the leakage coefficient obtained at multiple preset speeds; the leakage coefficient speed consistency index is used to evaluate the consistency of the leakage coefficient at different speeds.

[0046] Step 106: Compare the actual theoretical flow coefficient with the standard theoretical flow coefficient and the actual leakage coefficient with the standard leakage coefficient, and output the performance evaluation results of the gear flow pump under test based on the comparison results.

[0047] In one exemplary embodiment, the wear type or abnormality type of the gear flow pump under test is identified based on at least two of the following: theoretical flow deviation rate, leakage growth rate, average goodness of fit, and leakage coefficient speed consistency index: wear type or abnormality type includes increased axial clearance, gear wear, increased radial clearance, local damage to tooth surface, sealing abnormality, air ingress or air bubbles in pipeline.

[0048] In one exemplary embodiment, to further identify the type of wear or anomaly, a leakage coefficient-speed consistency index, i.e., a leakage coefficient-speed consistency coefficient, can be calculated. Let the standard deviation of the leakage coefficient at different effective speeds be... Then the leakage coefficient and the rotational speed consistency coefficient can be expressed as: ; in, Leakage coefficient and rotational speed consistency coefficient.

[0049] When leakage coefficient and rotational speed consistency coefficient When the leakage coefficient is not greater than 15%, it indicates that the overall internal clearance of the gear flow pump has increased or that stable leakage has increased; when the leakage coefficient and speed consistency coefficient are... A value greater than 15% indicates localized damage to the tooth surface, air bubble effect, pipeline abnormality, or unstable test data.

[0050] In one exemplary embodiment, the low-pressure residual index can be used to assist in identifying sealing anomalies. Let the measured flow rate under the lowest reference load level or lowest measured differential pressure condition be... The corresponding fitted flow rate is The residual rate of the low-voltage section can be expressed as: ; When the residual rate of the low-pressure section is significantly abnormal, while the data of the high-pressure section shows a different trend, it may indicate that there is a sealing abnormality, low-pressure external leakage, or fluid circuit connection problem.

[0051] In an exemplary embodiment, if the actual output flow rate continuously collected within a single combined operating condition fluctuates significantly, and the goodness of fit between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference is low (i.e., the goodness of fit is less than 0.95), it can indicate that there is air inlet in the pipeline, bubble influence, abnormal flow sensor, or unstable liquid circuit status.

[0052] In an exemplary embodiment, if the leakage growth rate increases significantly (i.e., the leakage growth rate is not less than 30%), while the theoretical flow deviation rate is small (i.e., the absolute value of the theoretical flow deviation rate is not greater than 5%), and the goodness of fit is high (i.e., the goodness of fit is not less than 0.95), then it can be determined that the internal clearance of the gear flow pump has increased, which may correspond to an increase in axial clearance or radial clearance.

[0053] In an exemplary implementation, if the theoretical flow deviation rate is significantly negative or the absolute value of the deviation is large (i.e., the absolute value of the theoretical flow deviation rate is greater than 5%), and the leakage growth rate is also increased (i.e., the leakage growth rate is not less than 30%), then it can be determined that the effective discharge volume has decreased, which may correspond to gear wear, tooth tip wear, or housing wear.

[0054] In an exemplary embodiment, if the goodness of fit between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference is low (i.e., the goodness of fit is less than 0.95), the leakage coefficient has a large degree of dispersion at different speeds (i.e., the leakage growth rate is not less than 30%), and the flow rate fluctuates significantly within a single combined operating condition, it can be determined that there is local damage to the tooth surface, air inlet in the pipeline, bubble influence, or unstable liquid circuit status.

[0055] In one exemplary embodiment, the low-pressure residual index can be used to assist in identifying sealing abnormalities, external leaks, or connection anomalies. Let the measured flow rate under the lowest reference load level or lowest measured differential pressure condition be... The corresponding fitted flow rate, calculated based on the relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference at the same preset speed, is: Low-voltage section residual rate It can be represented as: ; when When the residual value exceeds a preset low-pressure section threshold, the low-pressure section residual index is considered abnormal, and the deviation between the measured flow rate and the fitted flow rate under low-pressure conditions is considered significant. The preset low-pressure section residual threshold can be 5% to 10%, preferably 8%. For example, when the preset low-pressure section residual threshold is 8%, and... When the residual rate of the low-pressure section is abnormal, it can indicate that there is a sealing abnormality, external leakage, or abnormal connection. When the residual rate of the low-pressure section is abnormal and the data of the high-pressure section shows a different trend, it can further indicate that there is a low-pressure external leakage, abnormal sealing component, or fluid circuit connection problem.

[0056] The specific faults or anomalies corresponding to each parameter are similar to those shown in the table below: ; A significantly increased leakage rate can be defined as a leakage rate greater than or equal to 30%; a small theoretical flow deviation rate can be defined as an absolute value of the theoretical flow deviation rate less than or equal to 5%; a high average goodness of fit can be defined as an average goodness of fit greater than or equal to 0.95, while a low average goodness of fit indicates an average goodness of fit less than 0.95; good consistency between the leakage coefficient and rotational speed can be defined as a leakage coefficient variation coefficient less than or equal to 15%, while poor consistency between the leakage coefficient and rotational speed indicates a leakage coefficient greater than 15%. The above thresholds are merely examples and can be adjusted based on the gear flow pump model, standard performance parameters, test liquid and temperature conditions, and maintenance experience.

[0057] Example 2 Figure 2 This is a schematic diagram of the performance testing device for a gear flow pump for a dialysis machine according to an embodiment of this application. Now, in conjunction with... Figure 2 This application provides a detailed description of the performance testing device for a gear flow pump used in a dialysis machine according to embodiments of the present application.

[0058] In one exemplary embodiment, the performance testing device for the gear flow pump of the dialysis machine in this application embodiment may also be used to perform testing as needed, employing the performance testing method for the gear flow pump of the dialysis machine described above.

[0059] In one exemplary embodiment, the performance testing device for a gear flow pump used in a dialysis machine according to this application includes: a liquid circulation module 201, a drive module 202, a pipeline load formation and pressure measurement module 203, a data acquisition module 204, and a data processing module 205, such as... Figure 2 As shown.

[0060] In one exemplary embodiment, the liquid circulation module 201 is used to provide a circulating test liquid path, that is, a circulating test liquid path is required when testing with test liquid, and the path is provided by the liquid circulation module 201.

[0061] In one exemplary embodiment, the drive module 202 is used to drive the gear flow pump under test to operate at multiple preset speeds, and its driving force is matched with that of the gear flow pump under test.

[0062] In one exemplary embodiment, the pipeline load formation and pressure measurement module 203 is used to form multiple preset load passages with different equivalent pipeline resistances on the outlet side of the gear flow pump under test, and to collect the inlet pressure and outlet pressure of the gear flow pump under test.

[0063] In one exemplary embodiment, the data acquisition module 204 is used to acquire the actual output flow rate of the gear flow pump under various combined operating conditions; of course, it can also be used to acquire rotational speed data as needed.

[0064] In one exemplary embodiment, the data processing module 205 is used to determine the absolute value of the actual inlet and outlet pressure difference based on the inlet pressure and the outlet pressure, and to establish a correspondence between the actual output flow rate of the gear flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference.

[0065] In one exemplary embodiment, establishing the correspondence between the actual output flow rate of the gear flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference further includes: At the same preset speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load channels to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ; in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

[0066] In an exemplary embodiment, the data processing module 205 is further configured to: average the theoretical flow coefficients at multiple preset speeds to obtain an average theoretical flow coefficient; determine the theoretical flow deviation rate based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient; average the actual leakage coefficients at multiple preset speeds to obtain an average leakage coefficient; and determine the leakage growth rate based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

[0067] In one exemplary embodiment, the formula for calculating the leakage growth rate is: ; in, The leakage growth rate; The average leakage coefficient of the gear pump under test; The standard leakage coefficient; The formula for calculating the theoretical flow deviation rate is: ; in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; This is the standard theoretical flow coefficient.

[0068] In an exemplary embodiment, the data processing module 205 is further configured to calculate the goodness of fit of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and determine the average goodness of fit based on the goodness of fit at multiple preset speeds; the average goodness of fit is used to evaluate the linearity of the response of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference; and to determine the leakage coefficient speed consistency index based on the dispersion of the leakage coefficient obtained at multiple preset speeds; the leakage coefficient speed consistency index is used to evaluate the consistency of the leakage coefficient at different speeds.

[0069] In an exemplary embodiment, the data processing module 205 is further configured to extract the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test based on the correspondence between the actual output flow rate and the actual inlet and outlet pressure difference absolute value, compare the actual theoretical flow coefficient with the standard theoretical flow coefficient of the gear flow pump under test, compare the actual leakage coefficient with the standard leakage coefficient of the gear flow pump under test, and output the performance evaluation result of the gear flow pump under test based on the comparison result.

[0070] In one exemplary embodiment, the data processing module 205 is further configured to identify the wear type or abnormality type of the gear flow pump under test based on at least two of the following: theoretical flow deviation rate, leakage growth rate, average goodness of fit, and leakage coefficient speed consistency index. Wear types or abnormalities include increased axial clearance, gear wear, increased radial clearance, localized damage to tooth surfaces, abnormal sealing, and air ingress or air bubbles in pipelines.

[0071] It will be understood by those skilled in the art that the above are merely preferred embodiments of this application and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for testing the performance of a gear flow pump used in a dialysis machine, characterized in that, include: Obtain the standard performance parameters of the gear flow pump under test, including the standard theoretical flow coefficient and the standard leakage coefficient; The gear flow pump under test is controlled to operate under a combination of multiple preset speeds and multiple preset load paths, wherein the multiple preset load paths are load paths with different equivalent pipeline resistances. Under each of the aforementioned combined operating conditions, the inlet pressure, outlet pressure, and actual output flow of the gear flow pump under test are collected, and the absolute value of the actual inlet and outlet pressure difference is determined based on the inlet pressure and the outlet pressure. Establish the correspondence between the actual output flow rate of the gear flow pump under test and the absolute value of the actual inlet and outlet pressure difference at each preset speed; Based on the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test are extracted. The actual theoretical flow coefficient is compared with the standard theoretical flow coefficient, and the actual leakage coefficient is compared with the standard leakage coefficient. Based on the comparison results, the performance evaluation result of the gear flow pump under test is output.

2. The performance testing method for the gear flow pump for dialysis machines according to claim 1, characterized in that, The step of establishing the correspondence between the actual output flow rate of the gear pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference includes: At the same preset rotational speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load paths to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ； in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

3. The performance testing method for the gear flow pump for dialysis machines according to claim 2, characterized in that, The average theoretical flow coefficient is obtained by averaging the theoretical flow coefficients at multiple preset rotation speeds. The theoretical flow deviation rate is determined based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient; The average leakage coefficient is obtained by averaging the actual leakage coefficients at multiple preset speeds. The leakage growth rate is determined based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

4. The performance testing method for the gear flow pump for dialysis machines according to claim 3, characterized in that, The formula for calculating the leakage growth rate is: ； in, The leakage growth rate; The average leakage coefficient of the gear flow pump under test; The standard leakage coefficient is mentioned above; The formula for calculating the theoretical flow deviation rate is: ； in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; The standard theoretical flow coefficient is given.

5. The performance testing method for the gear flow pump for dialysis machines according to claim 4, characterized in that, Also includes: Calculate the goodness of fit of the relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and determine the average goodness of fit based on the goodness of fit at multiple preset speeds. The average goodness of fit is used to evaluate the linearity of the response between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference. Based on the degree of dispersion of the leakage coefficients obtained at multiple preset speeds, a leakage coefficient speed consistency index is determined; The leakage coefficient rotational speed consistency index is used to evaluate the consistency of the leakage coefficient at different rotational speeds.

6. The performance testing method for the gear flow pump for dialysis machines according to claim 5, characterized in that, The wear type or abnormality type of the tested gear flow pump is identified based on at least two of the theoretical flow deviation rate, the leakage growth rate, the average goodness of fit, and the leakage coefficient speed consistency index. The wear types or abnormalities include increased axial clearance, gear wear, increased radial clearance, localized damage to the tooth surface, abnormal sealing, and air ingress or air bubbles in the pipeline.

7. A performance testing device for a gear flow pump used in a dialysis machine, characterized in that, include: Liquid circulation module, used to provide circulation test liquid path; The drive module is used to drive the gear flow pump under test to operate at multiple preset speeds; The pipeline load formation and pressure measurement module is used to form multiple preset load paths with different equivalent pipeline resistances on the outlet side of the gear flow pump under test, and to collect the inlet pressure and outlet pressure of the gear flow pump under test. The data acquisition module is used to collect the actual output flow of the gear flow pump under test under various combined operating conditions; The data processing module is used to determine the absolute value of the actual inlet and outlet pressure difference based on the inlet pressure and the outlet pressure, and to establish the correspondence between the actual output flow rate of the gear flow pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference. The data processing module is also used to extract the actual theoretical flow coefficient and actual leakage coefficient of the gear flow pump under test according to the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, compare the actual theoretical flow coefficient with the standard theoretical flow coefficient of the gear flow pump under test, compare the actual leakage coefficient with the standard leakage coefficient of the gear flow pump under test, and output the performance evaluation result of the gear flow pump under test according to the comparison result.

8. The performance testing device for the gear flow pump for a dialysis machine according to claim 7, characterized in that, The step of establishing the correspondence between the actual output flow rate of the gear pump under test at each preset speed and the absolute value of the actual inlet and outlet pressure difference also includes: At the same preset rotational speed, linear fitting is performed on the absolute values ​​of the actual inlet and outlet pressure differences and the actual output flow rate corresponding to multiple preset load paths to obtain the fitting relationship between the actual output flow rate and the absolute value of the actual inlet and outlet pressure differences. The calculation formula is as follows: ； in, This refers to the actual output flow rate; This is the theoretical flow coefficient; Rotational speed; This represents the actual leakage coefficient. This represents the absolute value of the actual pressure difference between the inlet and outlet.

9. The performance testing device for the gear flow pump for a dialysis machine according to claim 8, characterized in that, The data processing module is also used to average the theoretical flow coefficients at multiple preset rotation speeds to obtain the average theoretical flow coefficient. The theoretical flow deviation rate is determined based on the relative difference between the average theoretical flow coefficient and the standard theoretical flow coefficient; The average leakage coefficient is obtained by averaging the actual leakage coefficients at multiple preset speeds. The leakage growth rate is determined based on the relative difference between the average leakage coefficient and the standard leakage coefficient.

10. The performance testing device for the gear flow pump for a dialysis machine according to claim 9, characterized in that, The formula for calculating the leakage growth rate is: ； in, The leakage growth rate; The average leakage coefficient of the gear flow pump under test; The standard leakage coefficient is mentioned above; The formula for calculating the theoretical flow deviation rate is: ； in, This represents the theoretical flow deviation rate. The average theoretical flow coefficient of the gear pump under test; The standard theoretical flow coefficient is given.

11. The performance testing device for the gear flow pump for a dialysis machine according to claim 10, characterized in that, The data processing module is also used to calculate the goodness of fit of the correspondence between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference, and to determine the average goodness of fit based on the goodness of fit under multiple preset speeds. The average goodness of fit is used to evaluate the linearity of the response between the actual output flow rate and the absolute value of the actual inlet and outlet pressure difference. Based on the degree of dispersion of the leakage coefficients obtained at multiple preset speeds, a leakage coefficient speed consistency index is determined; The leakage coefficient rotational speed consistency index is used to evaluate the consistency of the leakage coefficient at different rotational speeds.

12. The performance testing device for the gear flow pump for a dialysis machine according to claim 11, characterized in that, The data processing module is also used to identify the wear type or abnormality type of the gear flow pump under test based on at least two of the theoretical flow deviation rate, the leakage growth rate, the average goodness of fit, and the leakage coefficient speed consistency index. The wear types or abnormalities include increased axial clearance, gear wear, increased radial clearance, localized damage to the tooth surface, abnormal sealing, and air ingress or air bubbles in the pipeline.

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