High-pressure flow path sealing performance detection system, method and equipment and storage medium

Abstract

The invention provides a high-pressure flow path sealing performance detection system, method and device and a storage medium, and the system comprises a liquid inlet subsystem which is used for conveying a specified solvent to a pump body unit; the pump body unit comprises a driving device and a plunger rod, and the driving device is used for driving the plunger rod to move forwards or backwards; the pressure sensor is used for detecting the pressure in the high-pressure flow path; the control equipment is used for controlling the driving state of the driving device according to the pressure information detected by the pressure sensor, so that the pressure in the high-pressure flow path is linearly increased until the target pressure is reached; under the condition that the pressure in the high-pressure flow path reaches the target pressure, the pressure in the high-pressure flow path is maintained to be the target pressure, and under the condition that it is determined that the leakage rate calculation starting time is reached, the leakage rate of the high-pressure flow path is calculated. The high-pressure flow path sealing performance detection system can improve the accuracy of high-pressure flow path sealing performance detection.

Description

Technical Field

[0001] The present application relates to the field of high-pressure flow path control technology, and in particular to a high-pressure flow path sealing detection system, method, device and storage medium. Background Art

[0002] High-pressure flow lines refer to piping systems used to transport high-pressure fluids (liquids or gases). These types of flow lines are typically used in applications requiring high pressures, and due to limitations in sealing technology, leakage is unavoidable.

[0003] The measurement of leakage rate in high-pressure flow paths has become a hot research direction. Summary of the Invention

[0004] In view of this, the present application provides a high-pressure flow path sealing detection system, method, device and storage medium.

[0005] Specifically, this application is implemented through the following technical solutions:

[0006] According to a first aspect of an embodiment of the present application, a high-pressure flow path sealing detection system is provided, comprising: a control device, a pump unit, a liquid inlet subsystem, and a pressure sensor; wherein:

[0007] The liquid inlet subsystem is in communication with the pump unit and is used to deliver a specified solvent to the pump unit;

[0008] The pump unit includes a driving device and a plunger rod, wherein the driving device is used to drive the plunger rod to move forward or backward to increase or decrease the pressure in the high-pressure flow path;

[0009] The pressure sensor is used to detect the pressure in the high-pressure flow path;

[0010] The control device is respectively connected to the pressure sensor and the drive device of the pump body unit, and is used to control the driving state of the drive device based on the pressure information detected by the pressure sensor, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached; when the pressure in the high-pressure flow path reaches the target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that the starting time for leakage rate calculation is reached, the leakage rate of the high-pressure flow path is calculated.

[0011] According to a second aspect of an embodiment of the present application, a high-pressure flow path sealing detection method is provided, which is applied to a control device in a high-pressure flow path sealing detection system. The method includes:

[0012] Acquiring pressure information detected by a pressure sensor; wherein the pressure sensor is used to detect the pressure in the high-pressure flow path;

[0013] controlling the driving state of the driving device of the pump unit according to the pressure information detected by the pressure sensor so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached;

[0014] When the pressure in the high-pressure flow path reaches a target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that a leakage rate calculation start time has been reached, the leakage rate of the high-pressure flow path is calculated.

[0015] According to a third aspect of an embodiment of the present application, an electronic device is provided, comprising a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor is used to execute the machine-executable instructions to implement the method provided in the first aspect.

[0016] According to a fourth aspect of an embodiment of the present application, a machine-readable storage medium is provided, wherein the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are executed by a processor, the method provided in the first aspect is implemented.

[0017] The technical solution provided by this application can at least bring the following beneficial effects:

[0018] The control device can control the driving state of the driving device according to the pressure information in the high-pressure flow path detected by the pressure sensor, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached. Compared with the traditional scheme in which the driving device of the pump body unit is constantly driven during the pressurization process, when the pressurization time is similar, the linear increase method can effectively reduce the temperature of the solvent at the end of the pressurization, thereby reducing the volume of the solvent that shrinks due to thermal effects during the pressure holding process and improving the accuracy of the high-pressure flow path sealing detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a structural diagram of a high-pressure flow path sealing detection system shown in an exemplary embodiment of the present application;

[0020] Figure 2 1 is a structural diagram of a high-pressure flow path sealing detection system shown in an exemplary embodiment of the present application;

[0021] Figure 3 1 is a flow chart of a method for detecting the sealing performance of a high-pressure flow path according to an exemplary embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of the hardware structure of an electronic device shown in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0024] The terms used in this application are for the purpose of describing particular embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0025] In order to enable those skilled in the art to better understand the technical solutions provided by the embodiments of the present application, and to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application are further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that the serial numbers of the steps in the embodiments of the present application do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0027] See Figure 1 , is a structural diagram of a high-pressure flow path sealing detection system provided in an embodiment of the present application, such as Figure 1 As shown, the high-pressure flow path sealing detection system may include: a control device 110, a pump unit 120, a liquid inlet subsystem 130, and a pressure sensor 140; wherein:

[0028] The liquid inlet subsystem 130 is in communication with the pump unit 120 and is used to deliver a specified solvent to the pump unit;

[0029] The pump unit 120 includes a drive device 121 and a plunger rod 122. The drive device 121 is used to drive the plunger rod to move forward or backward to increase or decrease the pressure in the high-pressure flow path.

[0030] a pressure sensor 140 for detecting the pressure in the high-pressure flow path;

[0031] The control device 110 is respectively connected to the pressure sensor 140 and the driving device 121 of the pump body unit 120, and is used to control the driving state of the driving device 121 based on the pressure information detected by the pressure sensor 140, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached; when the pressure in the high-pressure flow path reaches the target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that the starting time for leakage rate calculation is reached, the leakage rate of the high-pressure flow path is calculated.

[0032] It should be noted that in the embodiment of the present application, in order to ensure close contact between the plunger rod and the pump body unit, a seal (not shown in the figure) can also be provided on the plunger rod to make the plunger rod and the pump body unit in closer contact and achieve a sealed environment.

[0033] In the embodiment of the present application, considering that the high-pressure flow path sealing detection (i.e., leakage test) process is carried out under high pressure, the solvent needs to be pressurized to the target pressure first and then maintained under pressure. Due to the existence of compression heat effect, the temperature of the solvent will inevitably increase during the pressurization process, and thus the temperature of the solvent will decrease and the volume will shrink due to heat exchange during the pressure maintenance process. This part of the shrunk volume is calculated into the leakage amount, resulting in the calculated leakage rate (also known as leakage rate) being too large, that is, the solvent volume reduced during the pressure maintenance stage = the volume of the solvent leaked + the volume of the solvent shrunk due to the thermal effect.

[0034] Therefore, reducing the volume of solvent that shrinks due to thermal effects during the pressure holding process can improve the accuracy of the high-pressure flow path leakage rate statistics.

[0035] The volume of solvent that shrinks due to thermal effects during the packing process is positively correlated with the initial temperature of the solvent during the packing process. Lowering the initial temperature of the solvent during the packing process can effectively reduce the volume of solvent that shrinks due to thermal effects during the packing process.

[0036] Accordingly, in an embodiment of the present application, the pressure in the high-pressure flow path can be detected by a pressure sensor, and the control device can obtain the pressure information in the high-pressure flow path through the pressure sensor, and control the driving state (such as the motor speed) of the driving device (such as a motor) of the pump body unit based on the obtained pressure information, so that the pressure in the high-pressure flow path increases linearly.

[0037] Exemplarily, the high-pressure flow path includes a flow path within the pump body unit, ie, the sealing performance of the pump body unit itself is detected.

[0038] Alternatively, the high-pressure flow path includes a high-pressure flow path formed by the pump body unit communicating with the high-pressure fluid device to be measured.

[0039] Exemplarily, in the case of linear increase, during the pressurization stage, the rate of increase of the pressure in the high-pressure flow path is constant.

[0040] Compared with the traditional solution in which the driving device of the pump unit is constantly driven during the pressurization process (such as constant motor speed), the linear increase method can effectively reduce the temperature of the solvent at the end of the pressurization when the pressurization time is similar. Thereby, the volume of the solvent that shrinks due to thermal effects during the pressure holding process can be reduced, and the accuracy of high-pressure flow path sealing detection can be improved.

[0041] Exemplarily, the liquid inlet subsystem may include a solvent storage device, a liquid inlet channel and a one-way valve. The solvent storage device is used to store a specified solvent, the liquid inlet channel is used to transport the specified solvent to the pump body unit, and the one-way valve is used to ensure that the solvent is transported from the liquid inlet subsystem to the pump body unit in one direction.

[0042] For example, during the liquid inlet phase, the controller can control the pump unit's drive mechanism to drive the plunger rod backward, creating a negative pressure within the pump unit. This allows the designated solvent within the liquid inlet subsystem to be delivered to the pump unit. After the pump unit has absorbed sufficient solvent, the drive mechanism drives the plunger rod within the pump unit forward, increasing the pressure within the flow path and achieving pressurization.

[0043] In an embodiment of the present application, when the pressure in the high-pressure flow circuit reaches the target pressure, the controller can maintain the pressure in the high-pressure flow circuit at the target pressure (i.e., maintain pressure), and calculate the leakage rate of the high-pressure flow circuit when it is determined that the starting time for leakage rate calculation is reached.

[0044] For example, the leakage rate calculation time may be the time when the pressure in the high-pressure flow path reaches the target pressure, or a certain time point after the pressure in the high-pressure flow path reaches the target pressure.

[0045] For example, at any moment, the leakage rate of the high-pressure flow path at that moment can be the solvent volume reduced from the leakage rate calculation start time to the current moment, divided by the difference between the current moment and the leakage rate calculation start time. That is:

[0046]

[0047] Where η(t) is the leakage rate at time t, t is the current time, t0 is the starting time for leakage rate calculation, and V is the volume of solvent reduced from t0 to t.

[0048] It can be seen that in Figure 1In the high-pressure flow path sealing detection system shown, the control device can control the driving state of the driving device based on the pressure information in the high-pressure flow path detected by the pressure sensor, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached. Compared with the traditional scheme in which the driving device of the pump body unit is constantly driven during the pressurization process, when the pressurization time is similar, the linear increase method can effectively reduce the temperature of the solvent at the end of the pressurization, thereby reducing the volume of the solvent that shrinks due to thermal effects during the pressure holding process, and improving the accuracy of the high-pressure flow path sealing detection.

[0049] In some embodiments, the control device is specifically configured to control the driving state of the driving device at a target linear pressure increase rate so that the pressure in the high-pressure flow path increases linearly;

[0050] The target linear boost rate is determined based on a balance between detection efficiency and detection result accuracy. The detection result accuracy is negatively correlated with the linear boost rate, while the detection efficiency is positively correlated with the linear boost rate.

[0051] For example, considering that the linear pressurization rate is too high, although the target pressure can be reached quickly, the solvent temperature will be high when the target pressure is reached. Therefore, the volume of the solvent that shrinks due to the thermal effect during the pressurization process will be large, which will have a greater impact on the accuracy of the leakage rate calculation.

[0052] When the linear pressurization rate is too low, although the solvent temperature will be low when the target pressure is reached, the pressurization time will be too long, which will lead to low detection efficiency.

[0053] Therefore, in order to efficiently and accurately determine the leakage rate of the high-pressure flow path, the linear boost rate (which can be called the target linear boost rate) can be balanced and determined based on the detection efficiency and the accuracy of the detection results. In the boost stage, the control device can control the driving state of the driving device at the target linear boost rate to make the pressure in the high-pressure flow path increase linearly.

[0054] In some embodiments, the control device is specifically configured to determine that the leakage rate calculation start time has been reached when the pressure in the high-pressure flow path is maintained at a target pressure and the slope of the displacement curve of the plunger rod is less than a first preset threshold.

[0055] For example, in order to further reduce the impact of thermal shrinkage during the pressure holding process on the leakage rate calculation, when the pressure in the high-pressure flow path reaches the target pressure, the leakage rate calculation can be performed at a time when the solvent temperature is relatively low.

[0056] For example, the leakage rate calculation start time may be selected based on the displacement curve of the plunger rod.

[0057] For example, considering that during the pressure holding process, the slope of the displacement curve of the plunger rod usually decreases gradually, and the smaller the slope of the displacement curve of the plunger rod, the lower the current solvent temperature is, and the smaller the impact of thermal effect shrinkage on the leakage rate calculation is.

[0058] Accordingly, the starting time for calculating the leakage rate can be determined when the pressure in the high-pressure flow path is maintained at the target pressure and the slope of the displacement curve of the plunger rod is less than a preset threshold (which can be called the first preset threshold, and the specific value can be set according to actual needs).

[0059] It should be noted that if the starting time for leakage rate calculation is selected too late, it will also affect the sealing detection efficiency of the high-pressure flow path. Therefore, when selecting the above-mentioned first preset threshold, the detection efficiency and the accuracy of the detection results can be balanced.

[0060] In some embodiments, the control device is specifically configured to determine that the leakage rate calculation start time has been reached when the pressure in the high-pressure flow path is maintained at a target pressure and the change in the average speed of the plunger rod per unit time is less than a second preset threshold.

[0061] For example, in order to further reduce the impact of thermal shrinkage during the pressure holding process on the leakage rate calculation, when the pressure in the high-pressure flow path reaches the target pressure, the leakage rate calculation can be performed at a time when the solvent temperature is relatively low.

[0062] For example, considering that during the pressure holding process, the change in the average speed of the plunger rod per unit time usually decreases gradually, and the smaller the change in the average speed of the plunger rod per unit time, the lower the current solvent temperature will be, and the smaller the impact of thermal effect shrinkage on the leakage rate calculation will be.

[0063] Accordingly, the starting time for calculating the leakage rate can be determined when the pressure in the high-pressure flow path is maintained at the target pressure and the change in the average speed of the plunger rod per unit time is less than a preset threshold (which can be called a second preset threshold, and the specific value can be set according to actual needs).

[0064] It should be noted that if the starting time for leakage rate calculation is selected too late, it will also affect the sealing detection efficiency of the high-pressure flow path. Therefore, when selecting the above-mentioned second preset threshold, the detection efficiency and the accuracy of the detection results can be balanced.

[0065] In order to enable those skilled in the art to better understand the technical solutions provided by the embodiments of the present application, the technical solutions provided by the embodiments of the present application are described below with reference to specific examples.

[0066] In this embodiment, by using a linear pressurization method during the pressurization stage and selecting a suitable leakage rate calculation interval during the pressure holding process, the impact of shrinkage due to the solvent thermal effect is reduced as much as possible, thereby obtaining a more accurate leakage rate while ensuring detection efficiency.

[0067] See Figure 2 , is a structural diagram of a high-pressure flow path sealing detection system provided in an embodiment of the present application, such as Figure 2 As shown, the high-pressure flow path sealing detection system may include: a pump unit, a liquid inlet subsystem (including a solvent storage device, a one-way valve, and a liquid inlet channel in the figure), a pressure sensor, a control device (including a PC and a controller in the figure), and a dead blockage.

[0068] Pump unit: used to pump high-pressure liquid;

[0069] One-way valve: used to make the liquid in the flow path flow in one direction;

[0070] Pressure sensor: used to obtain the pressure in the flow path in real time;

[0071] Dead block: used to block the flow outlet;

[0072] The controller is used to control the motor speed according to the system status (such as the pressure in the flow path).

[0073] It should be noted that, in the case where a sealing test is required for the high-pressure flow path device, the pump unit may be connected to the high-pressure flow path device via a two-way connection.

[0074] In this embodiment, the leakage rate is calculated as follows:

[0075]

[0076] Where, t represents the current time, t2 represents the starting time for calculating the leakage rate (i.e., the above starting time), V 漏 Indicates the volume of solvent leakage due to insufficient flow path sealing. V(t2) represents the volume of the solvent that contracts due to temperature drop. V(t2) represents the volume in the flow path at time t2, and T2 represents the temperature of the solvent at time t2.

[0077] β is the thermal expansion coefficient of the solvent, C p is the constant-pressure specific heat of the solvent, and ρ is the density of the solvent. The three are related to the properties of the solvent itself.

[0078] It should be noted that in the above formula, V 漏 and cannot be determined separately, but the reduced solvent volume (i.e. V 漏 and the sum of the two).

[0079] It can be seen from the above leakage rate calculation formula that in order to obtain the true leakage rate during the leakage test, it is necessary to minimize the volume of the solvent that shrinks due to the thermal effect, so as to obtain a leakage rate that is closer to the true one.

[0080] Under the same test conditions, if you want to reduce the volume shrinkage caused by the thermal effect of the solvent, you can mainly achieve it by lowering the temperature of the solvent at time t2.

[0081] In this embodiment, the implementation of lowering the temperature of the solvent at time t2 may include:

[0082] 1) Reduce the compression heat effect during the supercharging process by linear supercharging;

[0083] 2) Select an appropriate leakage rate calculation interval.

[0084] The following describes the implementation process of the high-pressure flow path sealing detection in this embodiment.

[0085] S1, pressurization stage (time period from t0 to t1): After the pump body absorbs sufficient solvent, the motor drives the plunger rod in the pump body to move forward to increase the pressure in the flow path. During this process, the pressure sensor provides real-time feedback on the current pressure in the flow path, and the controller is used to adjust the motor speed in real time, thereby controlling the pressure in the flow path to rise linearly over time until the target pressure is reached.

[0086] S2, Pressure Holding Phase (t1 to t4): When the pressure reaches the target pressure, the controller maintains the pressure in the pipeline. Starting at t2, the leakage rate is calculated in real time from t3 to t4 using the above formula.

[0087] S3, decompression stage: decompression by reversing the motor to restore the pressure in the flow path to normal pressure, and compare the calculated leakage rate with the set threshold (which can be called the third threshold) to determine whether the flow path meets the sealing standard.

[0088] Illustratively, in this embodiment, in order to further reduce the volume of the solvent that shrinks due to thermal effects during the pressure holding process, a solvent with less thermal shrinkage may be used for testing.

[0089] Preferably, methanol can be selected as the solvent for high-pressure flow path sealing detection.

[0090] In order to enable those skilled in the art to better understand the technical effects of the technical solutions provided in the embodiments of the present application, the test results of the technical solutions provided in the embodiments of the present application and the implementation scheme of the constant speed of the motor in the traditional scheme are compared below.

[0091] Test conditions: Tested on the same dual pump fixture, with target pressures of 14,000 psi for the secondary pump and 12,000 psi for the primary pump.

[0092] Test solvent: methanol.

[0093]

[0094] For example, based on the above test results, during the pressurization stage, the target linear pressurization rate is 400psi / s; the 50th second when the pressure in the high-pressure flow path reaches the target pressure is the starting time for leakage rate calculation, which can better balance the detection efficiency and the accuracy of the detection results.

[0095] It can be seen that in the high-pressure flow path sealing detection, the method of the present invention can find a balance between the detection efficiency and the accuracy of the detection results, while ensuring the detection efficiency, reducing the interference of the solvent adiabatic compression heat effect on the leakage rate, thereby improving the accuracy of the flow path sealing detection.

[0096] The present application also provides a method for detecting the sealing performance of a high-pressure flow path. Figure 3 , is a flow chart of a high-pressure flow path sealing detection method provided in an embodiment of the present application, wherein the high-pressure flow path sealing detection method can be applied to a control device in a high-pressure flow path sealing detection system, for example, Figure 1 Control equipment in high-pressure flow path sealing detection system, such as Figure 3 As shown, the high-pressure flow path sealing detection method may include the following steps:

[0097] Step S300: Obtain pressure information detected by a pressure sensor; wherein the pressure sensor is used to detect the pressure in the high-pressure flow path.

[0098] Step S310: Control the driving state of the driving device of the pump unit according to the pressure information detected by the pressure sensor, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached.

[0099] In the embodiment of the present application, considering that the high-pressure flow path sealing detection (i.e., leakage test) process is carried out under high pressure, the solvent needs to be pressurized to the target pressure first and then maintained under pressure. Due to the existence of compression heat effect, the temperature of the solvent will inevitably increase during the pressurization process, and thus the temperature of the solvent will decrease and the volume will shrink due to heat exchange during the pressure maintenance process. This part of the shrunk volume is calculated into the leakage amount, resulting in the calculated leakage rate (also known as leakage rate) being too large, that is, the solvent volume reduced during the pressure maintenance stage = the volume of the solvent leaked + the volume of the solvent shrunk due to the thermal effect.

[0100] Therefore, reducing the volume of solvent that shrinks due to thermal effects during the pressure holding process can improve the accuracy of the high-pressure flow path leakage rate statistics.

[0101] The volume of solvent that shrinks due to thermal effects during the packing process is positively correlated with the initial temperature of the solvent during the packing process. Lowering the initial temperature of the solvent during the packing process can effectively reduce the volume of solvent that shrinks due to thermal effects during the packing process.

[0102] Accordingly, in an embodiment of the present application, the pressure in the high-pressure flow path can be detected by a pressure sensor, and the control device can obtain the pressure information in the high-pressure flow path through the pressure sensor, and control the driving state (such as the motor speed) of the driving device (such as a motor) of the pump body unit based on the obtained pressure information, so that the pressure in the high-pressure flow path increases linearly.

[0103] Exemplarily, in the case of linear increase, during the pressurization stage, the rate of increase of the pressure in the high-pressure flow path is constant.

[0104] Compared with the traditional solution in which the driving device of the pump unit is constantly driven during the pressurization process (such as constant motor speed), the linear increase method can effectively reduce the temperature of the solvent at the end of the pressurization when the pressurization time is similar. Thereby, the volume of the solvent that shrinks due to thermal effects during the pressure holding process can be reduced, and the accuracy of high-pressure flow path sealing detection can be improved.

[0105] Step S320: When the pressure in the high-pressure flow path reaches the target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that the leakage rate calculation start time has been reached, the leakage rate of the high-pressure flow path is calculated.

[0106] In an embodiment of the present application, when the pressure in the high-pressure flow circuit reaches the target pressure, the controller can maintain the pressure in the high-pressure flow circuit at the target pressure (i.e., maintain pressure), and calculate the leakage rate of the high-pressure flow circuit when it is determined that the starting time for leakage rate calculation is reached.

[0107] For example, the leakage rate calculation time may be the time when the pressure in the high-pressure flow path reaches the target pressure, or a certain time point after the pressure in the high-pressure flow path reaches the target pressure.

[0108] For example, at any moment, the leakage rate of the high-pressure flow path at that moment can be the solvent volume reduced from the leakage rate calculation start time to the current moment, divided by the difference between the current moment and the leakage rate calculation start time. That is:

[0109]

[0110] Where η(t) is the leakage rate at time t, t is the current time, t0 is the starting time for leakage rate calculation, and V is the volume of solvent reduced from t0 to t.

[0111] In some embodiments, controlling the driving state of the driving device of the pump unit so as to linearly increase the pressure in the high-pressure flow path may include:

[0112] controlling the driving state of the driving device at a target linear pressure increase rate so that the pressure in the high-pressure flow path increases linearly;

[0113] The target linear boost rate is determined based on a balance between detection efficiency and detection result accuracy. The detection result accuracy is negatively correlated with the linear boost rate, while the detection efficiency is positively correlated with the linear boost rate.

[0114] For example, considering that the linear pressurization rate is too high, although the target pressure can be reached quickly, the solvent temperature will be high when the target pressure is reached. Therefore, the volume of the solvent that shrinks due to the thermal effect during the pressurization process will be large, which will have a greater impact on the accuracy of the leakage rate calculation.

[0115] When the linear pressurization rate is too low, although the solvent temperature will be low when the target pressure is reached, the pressurization time will be too long, which will lead to low detection efficiency.

[0116] Therefore, in order to efficiently and accurately determine the leakage rate of the high-pressure flow path, the linear boost rate (which can be called the target linear boost rate) can be balanced and determined based on the detection efficiency and the accuracy of the detection results. In the boost stage, the control device can control the driving state of the driving device at the target linear boost rate to make the pressure in the high-pressure flow path increase linearly.

[0117] In some embodiments, the leakage rate calculation start time is determined by:

[0118] When the pressure in the high-pressure flow path is maintained at the target pressure and the slope of the displacement curve of the plunger rod is less than a first preset threshold, it is determined that the leakage rate calculation start time has been reached.

[0119] For example, in order to further reduce the impact of thermal shrinkage during the pressure holding process on the leakage rate calculation, when the pressure in the high-pressure flow path reaches the target pressure, the leakage rate calculation can be performed at a time when the solvent temperature is relatively low.

[0120] For example, the leakage rate calculation start time may be selected based on the displacement curve of the plunger rod.

[0121] For example, considering that during the pressure holding process, the slope of the displacement curve of the plunger rod usually decreases gradually, and the smaller the slope of the displacement curve of the plunger rod, the lower the current solvent temperature is, and the smaller the impact of thermal effect shrinkage on the leakage rate calculation is.

[0122] Accordingly, the starting time for calculating the leakage rate can be determined when the pressure in the high-pressure flow path is maintained at the target pressure and the slope of the displacement curve of the plunger rod is less than a preset threshold (which can be called the first preset threshold, and the specific value can be set according to actual needs).

[0123] It should be noted that if the starting time for leakage rate calculation is selected too late, it will also affect the sealing detection efficiency of the high-pressure flow path. Therefore, when selecting the above-mentioned first preset threshold, the detection efficiency and the accuracy of the detection results can be balanced.

[0124] In some embodiments, the leakage rate calculation start time is determined by:

[0125] When the pressure in the high-pressure flow path is maintained at the target pressure and the change in the average speed of the plunger rod per unit time is less than a second preset threshold, it is determined that the leakage rate calculation start time has been reached.

[0126] For example, in order to further reduce the impact of thermal shrinkage during the pressure holding process on the leakage rate calculation, when the pressure in the high-pressure flow path reaches the target pressure, the leakage rate calculation can be performed at a time when the solvent temperature is relatively low.

[0127] For example, considering that during the pressure holding process, the change in the average speed of the plunger rod per unit time usually decreases gradually, and the smaller the change in the average speed of the plunger rod per unit time, the lower the current solvent temperature will be, and the smaller the impact of thermal effect shrinkage on the leakage rate calculation will be.

[0128] Accordingly, the starting time for calculating the leakage rate can be determined when the pressure in the high-pressure flow path is maintained at the target pressure and the change in the average speed of the plunger rod per unit time is less than a preset threshold (which can be called a second preset threshold, and the specific value can be set according to actual needs).

[0129] It should be noted that if the starting time for leakage rate calculation is selected too late, it will also affect the sealing detection efficiency of the high-pressure flow path. Therefore, when selecting the above-mentioned second preset threshold, the detection efficiency and the accuracy of the detection results can be balanced.

[0130] An embodiment of the present application provides an electronic device, including a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor is used to execute the machine-executable instructions to implement the high-pressure flow path sealing detection method described above.

[0131] See Figure 4 , is a schematic diagram of the hardware structure of an electronic device provided in an embodiment of the present application. The electronic device may include a processor 401 and a memory 402 storing machine-executable instructions. The processor 401 and the memory 402 may communicate via a system bus 403. Furthermore, by reading and executing the machine-executable instructions corresponding to the high-pressure flow path sealing detection logic in the memory 402, the processor 401 may perform the high-pressure flow path sealing detection method described above.

[0132] The memory 402 mentioned herein may be any electronic, magnetic, optical, or other physical storage device that may contain or store information, such as executable instructions, data, and the like. For example, the machine-readable storage medium may be: RAM (Random Access Memory), volatile memory, non-volatile memory, flash memory, a storage drive (such as a hard disk drive), a solid-state drive, any type of storage disk (such as a CD, DVD, etc.), or similar storage media, or a combination thereof.

[0133] In some embodiments, a machine-readable storage medium is also provided. Figure 4 The memory 402 in the machine-readable storage medium stores machine-executable instructions. When executed by the processor, the machine-executable instructions implement the high-pressure flow path leak detection method described above. For example, the storage medium may be a ROM, RAM, CD-ROM, magnetic tape, floppy disk, or optical data storage device.

[0134] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0135] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A high-pressure flow path sealing detection system, characterized in that: include: Control equipment, pump unit, liquid inlet subsystem, pressure sensor; including: The liquid inlet subsystem is in communication with the pump unit and is used to deliver a specified solvent to the pump unit; The pump unit includes a driving device and a plunger rod, wherein the driving device is used to drive the plunger rod to move forward or backward to increase or decrease the pressure in the high-pressure flow path; The pressure sensor is used to detect the pressure in the high-pressure flow path; The control device is respectively connected to the pressure sensor and the drive device of the pump body unit, and is used to control the driving state of the drive device based on the pressure information detected by the pressure sensor, so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached; when the pressure in the high-pressure flow path reaches the target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that the starting time for leakage rate calculation is reached, the leakage rate of the high-pressure flow path is calculated.

2. The high-pressure flow path sealing detection system according to claim 1, characterized in that: The control device is specifically configured to control the driving state of the driving device at a target linear pressure increase rate so as to increase the pressure in the high-pressure flow path linearly; The target linear boost rate is determined based on a balance between detection efficiency and detection result accuracy. The detection result accuracy is negatively correlated with the linear boost rate, and the detection efficiency is positively correlated with the linear boost rate.

3. The high-pressure flow path sealing detection system according to claim 1, characterized in that: The control device is specifically configured to determine that a leakage rate calculation start time has been reached when the pressure in the high-pressure flow path is maintained at the target pressure and the slope of the displacement curve of the plunger rod is less than a first preset threshold.

4. The high-pressure flow path sealing detection system according to claim 1, characterized in that: The control device is specifically configured to determine that the leakage rate calculation start time has been reached when the pressure in the high-pressure flow path is maintained at the target pressure and the change in the average speed of the plunger rod per unit time is less than a second preset threshold.

5. The high-pressure flow path sealing detection system according to any one of claims 1 to 4, characterized in that: During the pressurization phase, the target linear pressurization rate is 400 psi / s; the 50th second after the pressure in the high-pressure flow path reaches the target pressure is the starting time for leakage rate calculation; and / or, The designated solvent is methanol.

6. The high-pressure flow path sealing detection system according to any one of claims 1 to 4, characterized in that: The high-pressure flow path includes a flow path in the pump body unit; or, The high-pressure flow path includes a high-pressure flow path formed by the pump body unit communicating with the high-pressure fluid device to be measured.

7. A method for detecting the sealing performance of a high-pressure flow path, characterized in that: A control device applied to a high-pressure flow path sealing detection system, the method comprising: Acquiring pressure information detected by a pressure sensor; wherein the pressure sensor is used to detect the pressure in the high-pressure flow path; controlling the driving state of the driving device of the pump unit according to the pressure information detected by the pressure sensor so that the pressure in the high-pressure flow path increases linearly until the target pressure is reached; When the pressure in the high-pressure flow path reaches a target pressure, the pressure in the high-pressure flow path is maintained at the target pressure, and when it is determined that a leakage rate calculation start time has been reached, the leakage rate of the high-pressure flow path is calculated.

8. The method according to claim 7, characterized in that The controlling the driving state of the driving device of the pump unit so as to linearly increase the pressure in the high-pressure flow path comprises: controlling the driving state of the driving device at a target linear pressure increase rate so that the pressure in the high-pressure flow path increases linearly; The target linear boost rate is determined based on a balance between detection efficiency and detection result accuracy, wherein the detection result accuracy is negatively correlated with the linear boost rate, and the detection efficiency is positively correlated with the linear boost rate; and / or, The leakage rate calculation start time is determined by the following method: When the pressure in the high-pressure flow path is maintained at the target pressure and the slope of the displacement curve of the plunger rod is less than a first preset threshold, determining that the leakage rate calculation start time has been reached; and / or, The leakage rate calculation start time is determined by the following method: When the pressure in the high-pressure flow path is maintained at the target pressure and the change in the average speed of the plunger rod per unit time is less than a second preset threshold, determining that the leakage rate calculation start time has been reached; and / or, During the pressurization phase, the target linear pressurization rate is 400 psi / s; the 50th second after the pressure in the high-pressure flow path reaches the target pressure is the starting time for leakage rate calculation; and / or, The high-pressure flow path includes a flow path in the pump body unit; or, the high-pressure flow path includes a high-pressure flow path formed by the pump body unit communicating with the high-pressure fluid device to be measured.

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor is configured to execute the machine-executable instructions to implement the method according to claim 7 or 8.

10. A machine-readable storage medium, characterized in that The machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are executed by a processor, the method according to claim 7 or 8 is implemented.

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