Flowmeter calibration method in supergravity environment

Abstract

The invention discloses a flowmeter calibration method in a supergravity environment, which belongs to the technical field of flowmeter calibration, and comprises the following steps: S1, arranging a standard flowmeter and a flowmeter to be measured in a fluid loop, S2, adjusting the output flow of a water pump station, and respectively setting the flow values as a plurality of different calibration flow points; s3, in a constant gravity environment, calculating a relative error e0 of each calibration flow point; s4, when the flowmeter is in a supergravity environment, calculating a relative error e1 of each calibration flow point; and S5, comparing the maximum relative error e1max in the supergravity environment with the maximum relative error e0max in the constant gravity environment. According to the method, the to-be-tested flowmeter and the standard flowmeter are subjected to multi-calibration-flow-point comparison test in the constant-gravity environment and the supergravity environment respectively, the maximum relative error comparison method is adopted, and precise evaluation and correction of the performance change of the flowmeter in the supergravity environment are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of flowmeter calibration, and in particular to a flowmeter calibration method in a hypergravity environment. Background Art

[0002] With the widespread application of hypergravity technology in aerospace, military, energy, and materials science, more and more equipment is required to operate and function in hypergravity environments for extended periods of time. Flowmeters, as key fluid measurement and control components, have a direct impact on the efficiency and safety of the entire system. However, most current flowmeters are designed and calibrated based on measurement standards for normal gravity environments and are not directly applicable to hypergravity environments.

[0003] In existing calibration methods, comparison and calibration are usually performed through standard flow meters or static measurement methods, but these methods are mostly limited to normal gravity environments. The accuracy detection and calibration technology for flow meters under supergravity conditions is not yet mature, and the relevant national or industry standards are also blank. Some known technologies, such as patent CN118500474A, use a centrifuge system to achieve flow measurement under supergravity conditions, but have the following shortcomings: the calibration process uses dynamically changing flow rather than a stable average flow, which does not meet the current national measurement specifications for stable flow during flow meter calibration; the referenced standard flow value is obtained through theoretical calculations, which is different from the actual working conditions, resulting in inaccurate calibration results;

[0004] In summary, existing technologies are still unable to achieve high-precision, high-reliability and effective calibration of flowmeters in hypergravity environments. Therefore, there is an urgent need to provide a new method and system for flowmeter calibration in hypergravity environments to improve the accuracy and reliability of calibration and meet the needs of fluid measurement under hypergravity conditions. Summary of the Invention

[0005] The present invention provides a flowmeter calibration method in a hypergravity environment to solve the technical problem that the prior art cannot achieve effective calibration of a flowmeter with high precision and high reliability in a hypergravity environment.

[0006] According to one aspect of the present invention, a flow meter calibration method in a hypergravity environment is provided, comprising the following steps:

[0007] S1, set a standard flow meter and a flow meter to be tested in the fluid circuit, the standard flow meter is used to provide a reference flow value Q, and the flow meter to be tested is used to detect its own output flow value Q';

[0008] S2, adjust the output flow of the water pump station so that the flow value is set to multiple different calibration flow points, and confirm the reference flow value Q at each calibration flow point through a standard flow meter;

[0009] S3. Under normal gravity environment, record the readings of the standard flowmeter and the flowmeter to be measured at each calibration flow point respectively. Calculate the relative error e0 at each calibration flow point according to the following formula: e0 = (Q' - Q) / Q. Calculate multiple e0 values based on multiple different calibration flow points respectively, and select the maximum value e0max therefrom.

[0010] S4. Start the centrifuge to make the flowmeter to be measured in a hypergravity environment. After the hypergravity value is stable, record the readings of the flowmeter to be measured at each calibration flow point respectively. Calculate the relative error e1 at each calibration flow point according to the following formula: e1 = (Q' - Q) / Q. Calculate multiple e1 values based on multiple different calibration flow points respectively, and select the maximum value e1max therefrom.

[0011] S5. Compare the maximum relative error e1max in the hypergravity environment with the maximum relative error e0max in the normal gravity environment. If the two are the same, it is confirmed that the accuracy of the flowmeter to be measured meets the requirements. If they are different, calibrate the flowmeter to be measured according to the readings of the standard flowmeter.

[0012] Optionally, the standard flowmeter and the pump station are arranged on the ground or the external platform of the centrifuge. The flowmeter to be measured is installed on the centrifuge basket. A fluid circuit connection is realized between the standard flowmeter and the flowmeter to be measured through a rotary joint arranged at the rotary center of the centrifuge.

[0013] Optionally, the standard flowmeter is installed at the rotary center of the centrifuge. The pump station and the flowmeter to be measured are jointly installed on the centrifuge basket. The standard flowmeter, the flowmeter to be measured and the pump station rotate synchronously with the centrifuge basket. The standard flowmeter is located at the rotary center.

[0014] Optionally, the pump station includes: a pump for providing the output flow of the system fluid; a water tank for storing and recycling the circulating fluid; a first regulating valve connected in parallel with the pump. The first regulating valve is used to control part of the fluid to flow back to the water tank, and when its opening degree increases, the flow rate flowing into the water tank increases; a second regulating valve connected in series with the outlet end of the parallel structure of the pump and the first regulating valve. The second regulating valve is used to control the fluid flow to the flowmeter to be measured, and when its opening degree increases, the flow rate flowing into the flowmeter to be measured increases.

[0015] Optionally, the pump station is a variable-frequency controlled pump or a hydraulic pump station, and stable control of the fluid output flow rate is realized through variable-frequency regulation or hydraulic system regulation.

[0016] Optionally, the values of the multiple different calibration flow points are taken between the maximum range value Qmax and the minimum range value of the flowmeter to be measured, including four flow points: Qmax, 0.75Qmax, 0.5Qmax and 0.25Qmax.

[0017] Optionally, the fluid circuit composed of the standard flowmeter, the flowmeter to be measured, and the water pump station is completely arranged inside the centrifuge rotation system, and the system power supply and data acquisition are realized through the built-in power supply system or wireless power supply and data transmission system.

[0018] Optionally, the rotary joint has a sealing structure to prevent fluid flow deviation caused by internal leakage of the rotary joint, and the sealing structure includes a multi-stage sealing ring.

[0019] Optionally, the step of calibrating the flowmeter to be measured according to the reading of the standard flowmeter includes:

[0020] In the hypergravity environment, according to the measured value Q of the standard flowmeter at multiple different calibration flow points and the corresponding measured value Q' of the flowmeter to be measured, the correction coefficient or correction function of the flowmeter to be measured is calculated;

[0021] And based on the correction coefficient or correction function, the output flow value of the flowmeter to be measured is corrected to make the output flow value of the flowmeter to be measured consistent with the reference value of the standard flowmeter.

[0022] Optionally, an abnormal state detection module is further provided, which is used to monitor the pressure, flow rate, and / or temperature parameters in the fluid circuit in real time. When the parameters exceed the preset safety range, an alarm device is triggered, and the system automatically stops the operation of the centrifuge and the output of the water pump station to avoid system failures and measurement errors.

[0023] In summary, the present application includes at least one of the following beneficial technical effects:

[0024] By respectively conducting comparative tests of multiple calibration flow points on the flowmeter to be measured and the standard flowmeter in the normal gravity and hypergravity environments, and using the method of maximum relative error comparison, the accurate evaluation and correction of the performance change of the flowmeter in the hypergravity environment are realized, and the problems in the prior art that the hydrodynamic changes and equipment errors caused by hypergravity cannot be accurately reflected and corrected are solved. By introducing a standard flowmeter to provide a reference flow value, the error caused by relying on theoretical calculation of the standard value is avoided. Combining multi-point calibration measurement and the maximum error screening mechanism improves the comprehensiveness and rigor of the evaluation. At the same time, when it is detected that the error in the hypergravity environment exceeds the allowable range, the flowmeter to be measured is dynamically corrected by calculating the correction coefficient or correction function, effectively compensating for the influence of hypergravity conditions on the measurement accuracy of the flowmeter, ensuring its high reliability and high precision under different working conditions, and overcoming the problem in the prior art that effective calibration cannot be achieved in the hypergravity environment.

[0025] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 is the schematic diagram of the flowmeter test for Embodiment 1 of the present invention;

[0028] Figure 2 is the schematic diagram of the flowmeter test for Embodiment 2 of the present invention.

[0029] Legend description:

[0030] 1. Pumping station; 11. Water pump; 12. First regulating valve; 13. Second regulating valve; 14. Water tank; 2. Flowmeter to be tested; 3. Suspension basket; 4. Standard flowmeter. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0032] The following combines the attached Figure 1-2 to further describe the present application in detail.

[0033] The embodiments of the present application disclose a method for calibrating a flowmeter under a hypergravity environment.

[0034] The method for calibrating a flowmeter under a hypergravity environment disclosed by the present invention is mainly used for calibrating a flowmeter with high precision under hypergravity conditions. The flowmeter calibrated by this method can be widely applied to hypergravity fields such as aerospace, deep space exploration, centrifuge simulation experiments, and material preparation to ensure its measurement accuracy and reliability in a hypergravity environment. It is especially suitable for fluid measurement systems that need to operate long-term in a hypergravity or high centripetal acceleration environment. This method is based on a closed-loop circulating fluid circuit system. The fluid circuit provides a power source through the pumping station 1 to drive the fluid (such as water or other experimental liquids) to continuously circulate in the closed system, flowing through the standard flowmeter 4 and the flowmeter to be tested 2 to form a comparison and analysis of flow data. The fluid circuit structure is optimized to enable the system to achieve stable flow control and data acquisition in different experimental environments, ensuring the accuracy and repeatability of the calibration process.

[0035] According to the spatial layout differences between the standard flowmeter 4 and the pumping station 1, the present invention provides two different fluid circuit schemes to adapt to different experimental conditions and system structure requirements.

[0036] Embodiment 1, referring to Figure 1, in this solution, the standard flowmeter 4 and the water pump station 1 are integrally installed on the external platform or the ground of the centrifuge and do not rotate with the centrifuge. The flowmeter 2 to be measured is installed inside the centrifuge hanging basket 3 and rotates synchronously with the hanging basket 3, being in a hypergravity environment. In order to achieve fluid transportation and circulation between the ground stationary system and the rotating system of the hanging basket 3, a special rotary joint is designed and installed at the center of rotation of the centrifuge.

[0037] The water pump station 1 is the power source of the system. Its structure includes a water pump 11, a water tank 14, a first regulating valve 12, and a second regulating valve 13. The water pump 11 uses a variable-frequency controlled water pump 11 or a hydraulic pump station, mainly responsible for driving the fluid to circulate in the entire closed loop and outputting stable flow and pressure; the water tank 14 is used to store and recycle the circulating fluid to maintain the stability of the liquid volume of the system; the first regulating valve 12 is arranged in parallel between the outlet of the water pump 11 and the water tank 14 to form a bypass channel. By controlling its opening degree, the flow rate of the fluid flowing into the water tank 14 can be adjusted. When the opening degree increases, more flow returns to the water tank 14, reducing the flow entering the main loop, playing a role in regulating the total flow rate of the system and balancing the system pressure; the second regulating valve 13 is arranged in series at the outlet end of the parallel structure of the water pump 11 and the first regulating valve 12, mainly controlling the flow rate of the fluid entering the flowmeter 2 to be measured. By adjusting the opening degree, the system can meet the flow distribution and stability requirements under different working conditions.

[0038] The water pump 11 pumps out the fluid from the water tank 14 and pressurizes and outputs it. The fluid first passes through the standard flowmeter 4 to obtain an accurate flow reference value Q, and then the fluid continues to enter the centrifuge hanging basket 3 through the liquid inlet channel of the rotary joint. Inside the hanging basket 3, the fluid successively flows through the flowmeter 2 to be measured to complete the flow measurement, and then the fluid returns to the water pump station 1 through the liquid return channel of the rotary joint. The reflux part realizes flow regulation through the second regulating valve 13 and the first regulating valve 12. Part of the fluid returns to the water tank 14, and the remaining part continues to circulate. In order to improve the sealing performance, the rotary joint has a multi-stage sealing structure to ensure the reliability of fluid sealing under high rotational speed and high centrifugal acceleration conditions, prevent leakage, and ensure accurate flow measurement.

[0039] In this embodiment, both the standard flowmeter 4 and the water pump station 1 are installed on the ground or the external platform of the centrifuge and are in a stationary state, avoiding the adverse effects of centrifugal force on the measurement accuracy of the standard flowmeter 4 and the stability of the water pump station 1, ensuring the accuracy of the reference flow value and the stability of the flow output by the water pump 11. At the same time, the water pump station 1 and the standard flowmeter 4 in this solution do not need to bear the hypergravity environment, which is convenient for maintenance and debugging, and reduces the operation and maintenance costs of the system. Through the highly sealed rotary joint set at the center of rotation of the centrifuge, efficient fluid transmission between the stationary system and the rotating system is achieved, ensuring the reliability and safety of the closed loop of the system.

[0040] Example 2. In this example, the standard flowmeter 4, the flowmeter 2 to be measured, and the water pump station 1 are all installed inside the centrifuge hanging basket 3 and rotate synchronously with the hanging basket 3. The standard flowmeter 4 is installed at the center of rotation of the centrifuge to avoid the influence of centrifugal force. The water pump station 1 and the flowmeter 2 to be measured are arranged on the periphery of the hanging basket 3. The water pump station 1 in this example includes a water tank 14 and a water pump 11 connected to the water tank 14.

[0041] In this example, the water pump 11 pumps out and pressurizes the fluid in the water tank 14, and the output fluid enters the standard flowmeter 4 to obtain the standard flow value Q. The fluid flows to the flowmeter 2 to be measured after passing through the standard flowmeter 4 to complete the flow detection, and the fluid returns to the water tank 14 after passing through the flowmeter 2 to be measured, realizing a closed-loop circulation. The fluid circuit composed of the standard flowmeter 4, the flowmeter 2 to be measured, and the water pump station 1 is completely arranged inside the centrifuge rotation system, and the system power supply and data acquisition are realized through the built-in power supply system or wireless power supply and data transmission system.

[0042] The standard flowmeter 4, the water pump station 1, and the flowmeter 2 to be measured in this example are all installed in the centrifuge hanging basket 3 and rotate synchronously with the entire centrifugal system, realizing the design of a closed internal fluid circuit for the whole system, and completely eliminating the sealing risk and energy loss problems brought by the transmission of fluid through the rotary joint between the static and dynamic systems. The standard flowmeter 4 is installed at the center of rotation of the centrifuge, avoiding the influence of centrifugal force on its measurement accuracy and ensuring the stability and reliability of the flow reference value.

[0043] Based on the above fluid circuit, the flowmeter calibration method under the hypergravity environment in this example includes the following steps:

[0044] S1. Set the standard flowmeter 4 and the flowmeter 2 to be measured in the fluid circuit. The standard flowmeter 4 is used to provide the reference flow value Q, and the flowmeter 2 to be measured is used to detect its own output flow value Q'.

[0045] In this step, a closed-loop circulating fluid circuit system is constructed, and the standard flowmeter 4 and the flowmeter 2 to be measured are installed in sequence. The standard flowmeter 4 is used as the calibration reference, and it has high measurement accuracy and can stably provide the reference flow value Q in both normal gravity and hypergravity environments. The flowmeter 2 to be measured is installed at the corresponding position in the system and is used to detect the output flow value Q' in real time when the fluid passes through. The function of this step is to provide a data acquisition basis for subsequent comparison and analysis, ensuring that the reference flow value and the flow value to be measured can be measured in the same fluid circuit and under the same conditions, and ensuring the accuracy and comparability of the data.

[0046] S2. Adjust the output flow of the water pump station 1 so that the flow values are set to multiple different calibration flow points respectively, and confirm the reference flow value Q at each calibration flow point through the standard flowmeter 4.

[0047] In this step, the output flow rate of the water pump 11 is controlled by the frequency conversion adjustment of the water pump 11 or the adjustment of the hydraulic system to achieve fine adjustment of the fluid flow rate and pressure of the system. With the coordinated control of the first regulating valve 12 and the second regulating valve 13, the flow rate is respectively set to multiple different calibrated flow rate points, and the values of the multiple different calibrated flow rate points are taken between the maximum range value Qmax and the minimum range value of the flowmeter 2 to be measured. In a specific embodiment, the calibrated flow rate points include four flow rate points: Qmax, 0.75Qmax, 0.5Qmax, and 0.25Qmax. The standard flowmeter 4 is used to detect and confirm the flow rate value Q at each calibration point in real time to ensure the accuracy and stability of the set flow rate points.

[0048] Setting multiple different calibrated flow rate points is to comprehensively evaluate the measurement performance and accuracy of the flowmeter 2 to be measured in different flow rate ranges, and ensure that its linearity and accuracy within the entire range meet the requirements. The flowmeter may have non-linear errors or sensitivity changes under different flow rate conditions. Calibrating only through a single flow rate point cannot reflect its performance status within the entire range. By selecting multiple calibrated flow rate points, the maximum range to the minimum range of the flowmeter can be covered, accurately revealing its measurement errors under different working conditions, and improving the measurement reliability of the flowmeter in the hypergravity environment.

[0049] S3. Under normal gravity environment, record the readings of the standard flowmeter 4 and the flowmeter 2 to be measured at each calibrated flow rate point respectively, and calculate the relative error e0 at each calibrated flow rate point according to the following formula: e0 = (Q' - Q) / Q, and calculate multiple e0 values based on multiple different calibrated flow rate points, and select the maximum value e0max therefrom.

[0050] The function of this step is to determine the measurement error benchmark of the flowmeter 2 to be measured under normal working conditions, and provide a reference standard for the subsequent error comparison in the hypergravity environment. At the same time, e0max is an important basis for measuring whether the performance of the flowmeter under normal gravity environment is qualified. Selecting the maximum value of the relative errors at multiple calibrated flow rate points is to ensure strict evaluation and control of the measurement errors of the flowmeter 2 to be measured under the most unfavorable working conditions. The measurement errors of the flowmeter at different flow rate points may vary. If only the average value or partial errors are referred to, it is easy to ignore the greater error risks under certain working conditions. By selecting the maximum value of the relative errors at each calibrated flow rate point, the worst performance of the flowmeter within the entire range can be comprehensively reflected, ensuring the safety margin and reliability during the calibration process.

[0051] S4. Start the centrifuge to place the flowmeter 2 to be measured in a hypergravity environment. After the hypergravity value stabilizes, record the readings of the flowmeter 2 to be measured at each calibrated flow point respectively. Calculate the relative error e1 at each calibrated flow point according to the following formula: e1 = (Q' - Q) / Q, and calculate multiple e1 values based on multiple different calibrated flow points respectively, and select the maximum value e1max therefrom.

[0052] After completing the error analysis in the normal gravity environment, start the centrifuge to make the flowmeter 2 to be measured enter the hypergravity environment. After the centrifuge speed stabilizes and the hypergravity state is stable, adjust the output flow of the pump station 1 in turn to ensure that the system operates according to multiple previous calibrated flow points. Record the readings of the standard flowmeter 4 and the flowmeter 2 to be measured respectively, and calculate the relative error e1 at each calibrated flow point according to the formula. Finally, screen out the maximum value e1max from multiple e1 values. The function of this step is to evaluate the measurement performance of the flowmeter 2 to be measured in the hypergravity environment, and detect whether its accuracy decreases or the error is too large due to the influence of centrifugal acceleration, so as to provide a basis for subsequent correction or confirmation.

[0053] S5. Compare the maximum relative error e1max in the hypergravity environment with the maximum relative error e0max in the normal gravity environment. If the two are the same, it is confirmed that the accuracy of the flowmeter 2 to be measured meets the requirements. If they are different, calibrate the flowmeter 2 to be measured according to the readings of the standard flowmeter 4.

[0054] Compare and analyze the maximum relative error e1max obtained in the hypergravity environment with the maximum relative error e0max in the normal gravity environment. If the two are basically the same, it means that the flowmeter 2 to be measured still maintains good measurement stability and accuracy in the hypergravity environment and does not need further calibration; if e1max is significantly greater than e0max, it indicates that the hypergravity environment affects the measurement accuracy of the flowmeter 2 to be measured, and it is necessary to calibrate and correct the flowmeter 2 to be measured according to the reference value Q of the standard flowmeter 4.

[0055] Specifically, the steps of calibrating the flowmeter 2 to be measured according to the readings of the standard flowmeter 4 include:

[0056] In the hypergravity environment, calculate the correction coefficient or correction function of the flowmeter 2 to be measured according to the measured values Q of the standard flowmeter 4 at multiple different calibrated flow points and the corresponding measured values Q' of the flowmeter 2 to be measured; and correct the output flow value of the flowmeter 2 to be measured based on the correction coefficient or correction function to make the output flow value of the flowmeter 2 to be measured consistent with the reference value of the standard flowmeter 4.

[0057] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A flowmeter calibration method under a hypergravity environment, characterized in that It includes the following steps: S1. A standard flowmeter (4) and a flowmeter to be measured (2) are arranged in a fluid circuit. The standard flowmeter (4) is used to provide a reference flow value Q, and the flowmeter to be measured (2) is used to detect its own output flow value Q'. S2. Adjust the output flow of the pump station (1) so that the flow values are respectively set to multiple different calibration flow points, and confirm the reference flow value Q at each calibration flow point through the standard flowmeter (4). S3. Under a normal gravity environment, record the readings of the standard flowmeter (4) and the flowmeter to be measured (2) at each calibration flow point respectively. Calculate the relative error e0 at each calibration flow point according to the following formula: e0 = (Q' - Q) / Q. Calculate multiple e0 values respectively based on multiple different calibration flow points, and select the maximum value e0max therefrom. S4. Start the centrifuge to make the flowmeter to be measured (2) in a hypergravity environment. After the hypergravity value is stable, record the readings of the flowmeter to be measured (2) at each calibration flow point respectively. Calculate the relative error e1 at each calibration flow point according to the following formula: e1 = (Q' - Q) / Q. Calculate multiple e1 values respectively based on multiple different calibration flow points, and select the maximum value e1max therefrom. S5. Compare the maximum relative error e1max in the hypergravity environment with the maximum relative error e0max in the normal gravity environment. If the two are the same, it is confirmed that the accuracy of the flowmeter to be measured (2) meets the requirements. If they are different, calibrate the flowmeter to be measured (2) according to the reading of the standard flowmeter (4).

2. The flowmeter calibration method under a hypergravity environment according to claim 1, wherein: The standard flowmeter (4) and the pump station (1) are arranged on the ground or an external platform of the centrifuge. The flowmeter to be measured (2) is installed on the centrifuge hanging basket (3). A fluid circuit connection is realized between the standard flowmeter (4) and the flowmeter to be measured (2) through a rotary joint arranged at the rotary center of the centrifuge.

3. The flowmeter calibration method under a hypergravity environment according to claim 1, wherein: The standard flowmeter (4) is installed at the rotary center of the centrifuge. The pump station (1) and the flowmeter to be measured (2) are jointly installed on the centrifuge hanging basket (3). The standard flowmeter (4), the flowmeter to be measured (2) and the pump station (1) rotate synchronously with the centrifuge hanging basket (3). Since the standard flowmeter (4) is located at the rotary center.

4. The flowmeter calibration method under the hypergravity environment according to claim 2, wherein The pump station (1) includes: A water pump (11) for providing the output flow of the system fluid; A water tank (14) for storing and recycling the circulating fluid; A first regulating valve (12) connected in parallel with the water pump (11). The first regulating valve (12) is used to control part of the fluid to flow back to the water tank (14), and when its opening degree increases, the flow rate flowing into the water tank (14) increases; A second regulating valve (13) connected in series with the outlet end of the parallel structure of the water pump (11) and the first regulating valve (12). The second regulating valve (13) is used to control the fluid flow to the flowmeter to be measured (2), and when its opening degree increases, the flow rate flowing into the flowmeter to be measured (2) increases.

5. The flowmeter calibration method under a hypergravity environment according to any one of claims 1-4, characterized in that: The pump station (1) is a variable-frequency controlled pump (11) or a hydraulic pump station, and stable control of the fluid output flow rate is achieved through variable-frequency regulation or hydraulic system regulation.

6. The flowmeter calibration method under a hypergravity environment according to claim 1, characterized in that: The values of multiple different calibration flow rate points are taken between the maximum range value Qmax and the minimum range value of the flowmeter to be measured (2), including four flow rate points of Qmax, 0.75Qmax, 0.5Qmax, and 0.25Qmax.

7. The flowmeter calibration method under a hypergravity environment according to claim 3, characterized in that: The fluid circuit composed of the standard flowmeter (4), the flowmeter to be measured (2), and the pump station (1) is completely arranged inside the centrifuge rotation system, and system power supply and data acquisition are realized through an internal power supply system or a wireless power supply and data transmission system.

8. The flowmeter calibration method under a hypergravity environment according to claim 2, characterized in that: The rotary joint has a sealing structure to prevent fluid flow rate deviation caused by internal leakage of the rotary joint, and the sealing structure includes multiple-stage sealing rings.

9. The flowmeter calibration method under a hypergravity environment according to claim 1, characterized in that: The step of calibrating the flowmeter to be measured (2) based on the reading of the standard flowmeter (4) includes: Under a hypergravity environment, according to the measured value Q of the standard flowmeter (4) at multiple different calibration flow rate points and the corresponding measured value Q' of the flowmeter to be measured (2), the correction coefficient or correction function of the flowmeter to be measured (2) is calculated; And based on the correction coefficient or correction function, the output flow rate value of the flowmeter to be measured (2) is corrected to make the output flow rate value of the flowmeter to be measured (2) consistent with the reference value of the standard flowmeter (4).

10. The flowmeter calibration method under a hypergravity environment according to claim 1, characterized in that: An abnormal state detection module is further provided, which is used to monitor the pressure, flow rate, and / or temperature parameters in the fluid circuit in real time. When the parameters exceed the preset safety range, an alarm device is triggered, and the system automatically stops the operation of the centrifuge and the output of the pump station (1) to avoid system failures and measurement errors.

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