Control valve performance comprehensive test board based on particle image velocity measurement technology

Abstract

The utility model discloses a control valve performance comprehensive test board based on a particle image velocity measurement technology, which comprises a medium storage box, a sealing pipeline and the medium storage box form a medium circulation loop, and the sealing pipeline is provided with a test area; the test tube assembly is located in the test area and detachably connected with the sealing pipeline in series, the test tube assembly is provided with a transparent observation tube and a to-be-tested control valve, and the sealing pipeline is provided with temperature and pressure sensors corresponding to the upstream and downstream of the test area respectively; the circulating pump is connected to the side, close to the discharging port, of the sealing pipeline and provides pressure medium fluid for the sealing pipeline, and a pipeline pressure sensor is arranged on the side, close to the circulating pump, of the sealing pipeline; the data acquisition system shoots and acquires the flow state of the medium in the observation pipe in the test area, and the computer is used for displaying the pressure, flow velocity and temperature parameters of the medium in the sealed pipeline in real time and analyzing the corrosion resistance, flow field characteristics, pressure loss, temperature control performance, flow velocity distribution and sealing performance of the test pipe assembly.

Description

Technical Field

[0001] This utility model belongs to the field of control valve sealing performance testing equipment, specifically involving a comprehensive test and verification device for testing the erosion wear, flow field characteristics, durability, and sealing performance of control valve sealing pairs. Background Technology

[0002] High-end control valves serve in a wide variety of applications under unique conditions, including ultra-high pressure and ultra-high temperature pipelines, nuclear and conventional island safety systems, aero-engine power systems, space station environmental control and life support systems, and submarine buoyancy and balancing systems. These environments place extremely stringent demands on the sealing reliability of control valves. Unlike traditional mechanical seals, high-end control valve seals operate in extremely harsh conditions such as high temperature, high pressure differentials, strong corrosion, and severe wear, leading to serious problems such as cavitation, erosion, corrosion, thermal deformation, blockage, pressure damage, and scratches. Particularly during the opening and closing of the control valve, high-speed jets are generated at the opening and closing gaps, severely damaging the sealing surface. This erosion is particularly pronounced when the medium is a weak acid / weak alkali or a strong acid / strong alkali. Furthermore, unlike traditional static and dynamic seals, control valve seals must maintain a high level of sealing performance throughout the static closing and dynamic opening processes of the control valve.

[0003] Current mainstream sealing theories are primarily based on the sealing pressure model, which considers factors such as the material properties, roughness, and dimensions of the sealing surface. According to this model, the sealing pressure generated by the sealing force must be greater than the required sealing pressure. Under normal operating conditions, the sealing design of control valves can obtain effective theoretical support using the sealing pressure model. However, in the development of high-end control valve products, the applicability of the sealing pressure model under extreme conditions is limited. In some cases, even if the indentation on the sealing surface does not reach the designed width (fit less than 65%), the product can still pass the sealing performance test. Some products, although their sealing surfaces meet the model requirements, still cannot achieve effective sealing. Furthermore, the erosion problem of the sealing pair in media of weak acids and weak bases or strong acids and strong bases is particularly prominent under extreme conditions, which is also a factor that existing sealing pressure models have not fully considered.

[0004] The sealing performance test of a control valve is used to test the sealing performance of the control valve in the closed state to ensure that the control valve can effectively prevent media leakage; common test methods are as follows:

[0005] Chinese patent CN219391251U discloses a device for detecting leakage in a valve under low-pressure gas seal test. Although it can solve the problems of low accuracy and poor precision in measuring the number of leaking bubbles and leakage flow rate in existing devices by using bubble counting or flow measurement methods, the method still has the following shortcomings: (1) The detection device is mainly for detecting low-pressure gas seal performance. It may not be applicable to high-pressure environments or other types of sealing tests, or it may need to be adjusted accordingly; (2) The device is designed to detect the gas leakage of valves under low-pressure conditions. It does not explicitly mention the ability to detect liquid leakage. If it is necessary to detect liquid leakage, additional devices or modifications to existing devices may be required.

[0006] Chinese patent CN117168706A discloses a valve sealing performance testing device. Although it can detect whether a valve is completely sealed, thus solving the technical problems in related technologies where it is difficult to observe small leaks in valves through foaming agents or differential pressure gauges, and the valve performance cannot be fully evaluated by only conducting valve airtightness tests under the same external pressure, the method still has the following shortcomings: (1) The device is designed to identify small leaks in valves through underwater detection, but this method is not very usable for special materials or applications that cannot come into contact with water; (2) The device is designed for specific types of valves, and may require customized adjustments for valves of different sizes or types, which will increase the overall testing cost; (3) The main goal of the device is to detect the sealing performance of valves, especially to determine whether there are small leaks by observing whether bubbles are generated. This is a qualitative rather than quantitative detection method, and it does not provide specific means to quantify the amount of leakage, such as leakage rate or leakage volume. This means that if the amount of leakage needs to be accurately measured, it may need to be combined with other equipment or technologies to meet a wider range of detection needs.

[0007] The flow field characteristic test of the control valve is used to detect the flow field characteristics of the control valve core under different opening states; Chinese patent CN112525275B discloses a three-dimensional flow field measurement system for pipelines based on the PIV method. Although this measurement system can complete flow field measurement and provide experimental conditions for flow meter manufacturers to conduct mechanism analysis and product performance optimization, the method still has the following shortcomings: (1) The equipment may simulate actual working conditions, especially in multiphase flow systems, which may affect the accuracy and reliability of the test results; (2) For different test requirements or more complex test conditions, the device may need additional modification or upgrade.

[0008] The erosion wear test of the sealing pair of the control valve is used to detect the erosion wear of the sealing pair of the control valve under a certain opening degree and under high pressure jet and extreme working conditions. Chinese patent CN110160902A discloses a detachable ring-type gas-liquid-solid erosion wear combined test device. Although the test section of the plexiglass is used to test the corresponding flow pattern / flow state in the pipeline, the erosion wear test of pipelines and valves with different gas, liquid and solid ratios can be realized. However, the method still has the following shortcomings: (1) Although the equipment can test the erosion wear of pipelines and valves with different gas, liquid and solid ratios, it may not be able to fully simulate all the complex conditions in the actual working conditions, such as the chemical properties of the fluid, the shape and hardness of the particles, etc.; (2) The structure of the equipment is relatively complex, involving multiple components and connection points, which may make installation and operation more difficult; (3) Although the equipment mentions detachable plexiglass test pipes many times, it does not provide any detection technology or equipment.

[0009] Chinese patent CN117517111A discloses an erosion wear testing device. Although it can achieve erosion wear testing of single-phase flow or multiphase flow to a certain extent, the method still has the following shortcomings: (1) Under multiphase flow conditions, the flow dynamics may be very complex, which may make it difficult to obtain accurate and repeatable test results, and the interaction between different phases may affect the wear mechanism, thereby affecting the test results; (2) The device may be optimized for specific types of media and wear conditions, but this limits its application in other types of wear tests.

[0010] In conclusion, it is necessary to construct a multifunctional comprehensive scientific research and testing platform to address issues such as the corrosion resistance of control valve sealing pairs, flow field characteristics, pressure loss, temperature control performance, flow velocity distribution, and sealing performance under extreme operating conditions.

[0011] Therefore, how to provide a comprehensive test bench for control valve performance based on particle image velocimetry technology is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0012] In view of this, the present invention provides a comprehensive test bench for control valve performance based on particle image velocimetry technology. It is reasonably designed, simple in structure, easy to process, and can easily obtain test data and test range, and can meet the test requirements of different performance of control valves.

[0013] To achieve the above objectives, the present invention adopts the following technical solution: a comprehensive test bench for the performance of control valves based on particle image velocity measurement technology, comprising: a medium storage tank, wherein the medium storage tank contains a fluid medium for providing the detection process, and the medium storage tank is provided with a discharge port and a return port;

[0014] A sealed pipeline is provided, with one end connected to the outlet and the other end connected to the return port, forming a medium circulation loop with the medium storage tank. A test area is provided on the sealed pipeline, and a flow sensor is provided on the side of the sealed pipeline near the return port.

[0015] The test tube assembly is located in the test area and is detachably connected in series with the sealed pipeline. The test tube assembly is equipped with a transparent observation tube and a control valve to be tested. Temperature and pressure sensors are respectively installed upstream and downstream of the test area in the sealed pipeline.

[0016] A circulating pump is connected to the side of the sealed pipeline near the outlet and provides pressure medium fluid to the sealed pipeline. A pipeline pressure sensor is provided on the side of the sealed pipeline near the circulating pump.

[0017] The data acquisition system is used to capture images of the medium flow state within the observation tube of the test area.

[0018] The computer is electrically connected to a temperature and pressure sensor, a flow sensor, a pipeline pressure sensor, and a data acquisition system. The computer is used to display the pressure, flow rate, and temperature parameters of the medium in the sealed pipeline in real time and to analyze the corrosion resistance, flow field characteristics, pressure loss, temperature control performance, flow rate distribution, and sealing performance of the test tube assembly.

[0019] The beneficial effects of this utility model are as follows: the medium storage tank provides the necessary fluid medium for the test; the test area is used for disassembling and installing the test tube assembly; the test tube assembly is connected in series to the sealed pipeline during testing; the circulation pump provides the necessary medium pumping pressure for the entire system; the test tube assembly includes an observation tube and the control valve under test; the observation tube is used by an external data acquisition system to collect fluid state data inside the tube, providing data support for corresponding analysis; this utility model has strong versatility, and according to different test needs, the corresponding test tube assembly can be replaced in the test area; it can test various performances of the control valve, including but not limited to valve sealing performance, flow field characteristics, durability and sealing pair erosion wear tests, etc., and can meet the testing needs of a single test device for multiple test schemes.

[0020] Preferably, the medium storage tank is equipped with a heating tube and a temperature sensor, and the bottom of the medium storage tank is equipped with a vent valve.

[0021] The resulting technical effect is that the heating element and temperature sensor can control and monitor the temperature of the medium. This setup is for testing the temperature control performance of the control valve sealing pair. By providing medium environments with different temperatures, the working performance and temperature resistance of the control valve under test are tested under different temperature conditions. The vent valve at the bottom of the medium tank is conducive to emptying the medium and avoiding the retention of medium, which would affect subsequent testing.

[0022] Preferably, an electric regulating valve is provided on the side of the sealed pipeline near the return port, and the electric regulating valve controls the stability of the medium and flow rate in the sealed pipeline.

[0023] The resulting technical effect is that, in order to ensure the stability of the medium pressure and flow rate in the sealed pipeline, an electric regulating valve is installed to ensure that the flow rate of the test medium meets the test requirements.

[0024] Preferably, a pressure stabilizing tank is connected in series downstream of the circulating pump in the sealed pipeline. The pressure stabilizing tank is equipped with a pressure regulating valve to regulate the medium pressure in the sealed pipeline. A pressure stabilizing tank exhaust valve is provided at the top of the pressure stabilizing tank, and a pressure stabilizing tank vent valve is provided at the bottom of the pressure stabilizing tank.

[0025] The resulting technical effects are as follows: the pressure stabilizing tank ensures stable medium pressure in the sealed pipeline, preventing damage to the sealed pipeline due to large pressure fluctuations; the pressure regulating valve adjusts the pipeline pressure to avoid excessively high or low pressure; the pressure stabilizing tank exhaust valve ensures medium filling; and the pressure stabilizing tank vent valve facilitates medium release and subsequent cleaning and maintenance.

[0026] Preferably, the sealed pipeline is provided with a manual valve and a one-way check valve on the side near the discharge port, and a back pressure valve on the side near the return port.

[0027] The resulting technical effects are: manual valves, one-way check valves, and back pressure valves can ensure the flow direction of the medium inside the sealed pipeline, prevent backflow of the medium, and ensure the pressure stability of the pipeline and the safe use of the circulating pump.

[0028] Preferably, a pressure relief pipeline is connected in parallel upstream of the sealed pipeline and near the test area, and the end of the pressure relief pipeline is connected to the medium storage tank.

[0029] The resulting technical effect is that the pressure relief pipeline is a safety feature that can prevent the pipeline from being damaged due to excessive pressure.

[0030] Preferably, in accordance with the testing requirements for the performance of the control valve under test, the medium storage tank is filled with a neutral fluid, an alkaline fluid, or an acidic fluid.

[0031] The resulting technical effect is that it is necessary to select the appropriate medium for different test conditions. For example, when testing the corrosion resistance of valves or special pipe materials in test pipe assemblies, it is necessary to replace the medium with strong acid and strong alkali or weak acid and weak alkali. However, when testing the sealing performance or flow field characteristics of valves, neutral water can be used instead.

[0032] Preferably, the data acquisition end of the data acquisition system includes, but is not limited to, a high-speed camera and a scanning electron microscope. By changing the opening degree of the valve in the test tube assembly and using particle image velocimetry technology, the transient velocity field data of the flow field of the valve at different opening degrees are obtained, and the flow characteristics of the fluid passing through the valve are obtained by computer analysis.

[0033] The resulting technical effect is that the data acquisition terminal of the data acquisition system can obtain the medium state data in the pipeline of the test area. Combined with particle image velocimetry technology, the transient velocity field data of the flow field of the control valve under test at different opening degrees can be obtained, and the flow characteristics of the fluid when passing through the valve, such as the formation and shedding of vortices, can be analyzed.

[0034] Preferably, the sealing pipeline is provided with an opening and closing adjustment hole downstream of the test area. When the valve sealing performance test is carried out, the control valve under test in the test tube assembly is closed, and the sealing performance of the valve is quantitatively analyzed by collecting the leakage medium in the adjustment hole.

[0035] The resulting technical effect is that when testing the sealing performance of a control valve, the leakage amount can be quantified, and its sealing performance can be studied. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a comprehensive performance testing platform for control valves based on particle image velocimetry technology according to this utility model. Figure 1 ;

[0037] Figure 2 This is a schematic diagram of a comprehensive performance testing platform for control valves based on particle image velocimetry technology according to this utility model. Figure 2 ;

[0038] Figure 3 This is a schematic diagram of the data acquisition system of a comprehensive test bench for control valve performance based on particle image velocimetry technology according to this utility model.

[0039] 1. Medium storage tank, 2. Sealed pipeline, 3. Test area, 4. Flow sensor, 5. Test tube assembly, 501. Observation tube, 502. Control valve under test, 6. Temperature and pressure sensor, 7. Circulating pump, 8. Pipeline pressure sensor, 9. Data acquisition system, 10. Heating tube, 11. Temperature sensor, 12. Electric regulating valve, 13. Pressure stabilizing tank, 1301. Pressure stabilizing tank exhaust valve, 1302. Pressure stabilizing tank vent valve, 14. Manual valve, 15. One-way check valve, 16. Back pressure valve, 17. Pressure relief pipeline. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0041] See appendix to this utility model Figures 1 to 3 According to an embodiment of the present invention, a comprehensive test bench for the performance of a control valve based on particle image velocity measurement technology is provided, comprising: a medium storage tank 1, wherein the medium storage tank 1 contains a fluid medium for providing the detection process, and the medium storage tank 1 is provided with a discharge port and a return port;

[0042] The sealed pipeline 2 has one end connected to the outlet and the other end connected to the return port, forming a medium circulation loop with the medium storage tank 1. The sealed pipeline 2 is provided with a test area 3, and a flow sensor 4 is provided on the side of the sealed pipeline 2 near the return port. The flow sensor is used to detect the flow status in the sealed pipeline.

[0043] Test tube assembly 5 is located in the test area and is connected in series with a detachable sealed pipeline 2. The test tube assembly 5 is equipped with a transparent observation tube 501 and a control valve 502 under test. Temperature and pressure sensors 6 are respectively installed upstream and downstream of the test area in the sealed pipeline 2. The upstream and downstream temperature and pressure sensors can measure the pressure loss state of the test tube assembly. By obtaining the pressure difference between the inflow and outflow of the medium in the test area, the pressure loss of the control valve under test under different operating conditions (weak acid and weak base, strong acid and strong base media, different opening degree and medium flow rate) can be evaluated, and then the flow resistance characteristics of the valve (control valve under test) can be analyzed.

[0044] The circulating pump 7 is connected to the side of the sealed pipeline near the outlet and provides pressure medium fluid to the sealed pipeline. The sealed pipeline 2 is equipped with a pipeline pressure sensor 8 on the side near the circulating pump 7. In the early stage of the test, the pipeline pressure sensor and flow sensor are used to ensure that the pressure and flow rate in the sealed pipeline meet the test requirements, so as to provide preliminary preparation for subsequent tests.

[0045] Data acquisition system 9 captures images of the medium flow state inside the observation tube in the test area, including but not limited to the medium's flow velocity and flow field state.

[0046] The computer is connected to the temperature and pressure sensor 6, flow sensor 4, pipeline pressure sensor 8, and data acquisition system 9 via electrical signals. The computer has a built-in analysis and processing module and a display module. The computer is used to monitor and display the pressure, flow rate, and temperature parameters of the medium in the sealed pipeline 2 in real time, and can analyze the corrosion resistance, flow field characteristics, pressure loss, temperature control performance, flow rate distribution, and sealing performance of the test pipe assembly.

[0047] It should be noted that the test area is the section where the test tube assembly is replaced. In this section, the data acquisition system is used to photograph and collect data of the test area. The input end of the data acquisition system is connected to the high-speed camera's shooting end, and the output end is connected to the computer. The acquisition end also includes other data acquisition equipment such as scanning electron microscopes.

[0048] To meet different testing requirements and provide different medium temperatures, the medium storage tank 1 is equipped with a heating tube 10 and a temperature sensor 11 to facilitate testing the working performance and temperature resistance of the control valve under test under different temperature conditions. The bottom of the medium storage tank 1 is equipped with a vent valve to ensure that the medium with different pH values ​​in the medium storage tank is not left behind after the test, so as not to affect the pipeline life and subsequent testing use.

[0049] In order to control the medium pressure and flow rate in the sealed pipeline, an electric regulating valve 12 is installed on the side of the sealed pipeline 2 near the return port. The electric regulating valve 12 controls the stability of the medium and flow rate in the sealed pipeline 2 to ensure that the flow rate of the test medium is ≥5m / s.

[0050] In some other embodiments, a pressure stabilizing tank 13 is connected in series downstream of the circulating pump 7 in the sealed pipeline 2 to ensure that the medium pressure is stable and that the pipeline is not damaged due to large pressure fluctuations. The pressure stabilizing tank 13 is equipped with a pressure regulating valve to regulate the medium pressure in the sealed pipeline 2. The top of the pressure stabilizing tank 13 is equipped with a pressure stabilizing tank exhaust valve 1301. When in use, all the gas in the sealed pipeline needs to be vented. The bottom of the pressure stabilizing tank 13 is equipped with a pressure stabilizing tank vent valve 1302 to facilitate subsequent cleaning and maintenance.

[0051] In some other specific embodiments, a manual valve 14 and a one-way check valve 15 are provided on the side of the sealed pipeline 2 near the discharge port to prevent the medium from flowing back and damaging the pump body. The manual valve is used for emergency shut-off or manual adjustment of the pipeline. A back pressure valve 16 is provided on the side of the sealed pipeline 2 near the return port to ensure the flow direction of the medium in the sealed pipeline and improve the safety of the test process.

[0052] In other embodiments, a pressure relief line 17 is connected in parallel to the sealed line 2 and upstream of the test area. The end of the pressure relief line 17 is connected to the medium storage tank 1 to ensure the safe use of the sealed line and to provide emergency pressure relief when the pressure is too high.

[0053] In some other embodiments, depending on the testing purpose, the medium storage tank 1 is filled with a neutral fluid, an alkaline fluid, or an acidic fluid. Neutral water is used when testing the sealing performance of the control valve under test or when testing its impact on fluid flow. Alkaline or acidic media are selected when testing the corrosion resistance of the control valve under test.

[0054] The data acquisition terminal of the data acquisition system 9 includes, but is not limited to, a high-speed camera and a scanning electron microscope. By changing the opening degree of the valve in the test tube assembly and using particle image velocimetry technology, the transient velocity field data of the flow field of the valve at different opening degrees are obtained. The flow characteristics of the fluid passing through the valve are obtained by computer analysis.

[0055] The downstream of the test area corresponding to the sealing pipeline 2 is equipped with an opening and closing adjustment hole. When the valve sealing performance test is carried out, the control valve under test in the test tube assembly 5 is closed, and the valve sealing performance is quantitatively analyzed by collecting the leakage medium in the adjustment hole.

[0056] It should be noted that all component connections in the sealed pipeline of this utility model must be sealed to prevent leakage. Flange connections can be used to ensure sealing. To ensure the long-term operation of the system pipeline, all related components are required to have corrosion resistance, high temperature resistance, and high pressure resistance.

[0057] In practical implementation, the temperature sensor, pressure sensor, and flow sensor in the system all have specific requirements. They are made of 316L stainless steel. The temperature sensor has a detection limit of >300℃ and is pressure and corrosion resistant. The pressure sensor has a corrosion resistance requirement of (pH 3-4), a high temperature resistance requirement of (200-300℃), and a measurement range of ≥1MPa. The flow sensor has a corrosion resistance requirement of (pH 3-4), a high temperature resistance requirement of (200-300℃), and a liquid flow rate of ≥5m / s.

[0058] Detailed test results:

[0059] When conducting pipeline flow field characteristic tests, it is necessary to first install observation tubes and test tube assemblies in the test area of ​​the sealed pipeline. After turning on the circulation pump to pump the medium in the medium storage tank into the sealed pipeline for a few minutes, adjust the pressure stabilizing tank, and observe the pipeline pressure sensor and flow sensor to ensure that the pressure and flow velocity in the pipeline meet the test requirements. Then, by changing the valve opening of the control valve under test, the transient velocity field data of the flow field of the valve at different openings are obtained using particle image velocimetry technology. The flow characteristics of the fluid when passing through the valve are analyzed, such as the formation and shedding of vortices.

[0060] When conducting corrosion resistance tests on valves or special pipeline materials, the test tube assembly to be tested and verified must first be installed in the test area. After installation and commissioning, the medium in the medium storage tank is replaced with a strong acid-strong alkali or a weak acid-weak alkali medium. The circulation pump is turned on to pump the medium in the medium storage tank into the sealed pipeline. After a few minutes, the pressure stabilizing tank is adjusted, and the pipeline pressure sensor and flow sensor are observed to ensure that the pressure and flow rate in the pipeline meet the test requirements. The test platform is then continuously operated in the corrosive medium for a long period of time. After a period of operation, the test tube assembly is removed for observation to verify its corrosion resistance performance in medium fluids with different pH values.

[0061] When conducting valve sealing performance tests, test tube assemblies need to be installed in the test area to ensure the stability of the control valve under test. The test section is sealed by connecting it with a flange. After the pumped medium is pressurized and stabilized, the leaked medium is collected through the regulating hole downstream of the test area for quantitative analysis, or the data from the flow sensor 18 is observed to study its sealing performance.

[0062] When conducting erosion wear tests on control valve sealing pairs, it is necessary to first install observation tubes and test pieces in the test area. After turning on the circulation pump to pump the medium from the medium storage tank into the sealing pipeline for a few minutes, adjust the pressure stabilizing tank and observe the values ​​of the pipeline pressure sensor and flow sensor to ensure that the pressure and flow rate in the pipeline meet the test requirements. Then, by changing the valve opening of the control valve under test and keeping the valve opening constant, the test tube assembly can be removed after running the platform for a certain period of time to study the location and degree of erosion wear of the sealing pair, and the variable relationship between the opening, medium properties, medium pressure and flow rate.

[0063] When conducting valve flow velocity distribution tests, the flow rate of the medium inside the sealed pipeline is monitored by a flow sensor. Combined with particle image velocimetry technology, the flow velocity distribution inside the sealed pipeline can be analyzed in detail.

[0064] The temperature control performance of the control valve sealing pair is tested. The medium temperature is heated by heating tubes. The temperature and pressure sensors upstream and downstream of the test area can obtain the pressure loss changes of the test tube assembly, and can also test the working performance and temperature resistance of the test valve under different temperature conditions.

[0065] This utility model has at least the following technical effects:

[0066] Through different test tube components and data acquisition systems within the test area, it is capable of conducting a variety of tests related to the performance of control valves, including but not limited to: valve sealing performance, flow field characteristics, durability and erosion wear of sealing pairs, etc., which can meet the testing needs of a single test device for multiple test schemes;

[0067] By using particle image velocimetry to measure and analyze the flow field after a valve, transient velocity field data of the flow field at different valve openings can be obtained, and the flow characteristics of fluid passing through the valve, such as the formation and shedding of vortices, can be analyzed.

[0068] The pressure, flow rate, and valve opening of the medium in the sealed pipeline can be adjusted to simulate the working state of the control valve under different extreme conditions. Based on this, the sealing performance of the control valve can be tested to more comprehensively evaluate the sealing performance of the control valve and improve the accuracy of the test results.

[0069] By monitoring the pressure difference between the inflow and outflow of the medium in the test area, the pressure loss of the control valve under test under different operating conditions (weak acid and weak base, strong acid and strong base media, different opening degrees and medium flow rates) can be evaluated, and the flow resistance characteristics of the valve can be analyzed.

[0070] The sealing pipeline and supporting components of this utility model are all corrosion-resistant and temperature-resistant. Therefore, through long-term operation, the control valve under test can be observed for a long time in a corrosive medium to explore the relationship between the control valve material and variables such as medium flow rate, valve opening degree and time under corrosive medium. This is of great research significance for evaluating the corrosion resistance performance of the control valve.

[0071] The apparatus and methods disclosed in the embodiments are described simply because they correspond to the methods disclosed in the embodiments. For relevant details, please refer to the method section.

[0072] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A comprehensive test bench for control valve performance based on particle image velocimetry technology, characterized in that, include: A medium storage tank (1) contains a fluid medium for providing the detection process, and the medium storage tank (1) is provided with a discharge port and a return port; A sealed pipeline (2) is provided. One end of the sealed pipeline (2) is connected to the outlet, and the other end is connected to the return port and forms a medium circulation loop with the medium storage tank (1). A test area (3) is provided on the sealed pipeline (2), and a flow sensor (4) is provided on the side of the sealed pipeline (2) near the return port. Test tube assembly (5), the test tube assembly (5) is located in the test area and is connected in series with the sealed pipeline (2) in a detachable manner. The test tube assembly (5) is provided with a transparent observation tube (501) and a control valve to be tested (502). The sealed pipeline (2) is provided with temperature and pressure sensors (6) upstream and downstream of the test area respectively. A circulating pump (7) is connected to the side of the sealed pipeline near the outlet and provides pressure medium fluid to the sealed pipeline. A pipeline pressure sensor (8) is provided on the side of the sealed pipeline (2) near the circulating pump (7). Data acquisition system (9), wherein the data acquisition system (9) captures and collects images of the medium flow state inside the observation tube in the test area; The computer is electrically connected to a temperature and pressure sensor (6), a flow sensor (4), a pipeline pressure sensor (8), and a data acquisition system (9). The computer is used to display the pressure, flow rate, and temperature parameters of the medium in the sealed pipeline (2) in real time and to analyze the corrosion resistance, flow field characteristics, pressure loss, temperature control performance, flow rate distribution, and sealing performance of the test pipe assembly.

2. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, The medium storage tank (1) is equipped with a heating tube (10) and a temperature sensor (11), and the bottom of the medium storage tank (1) is equipped with a vent valve.

3. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, An electric regulating valve (12) is provided on the side of the sealed pipeline (2) near the return port. The electric regulating valve (12) controls the stability of the medium and flow rate in the sealed pipeline (2).

4. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, The sealed pipeline (2) is connected in series with a pressure stabilizing tank (13) downstream of the circulating pump (7). The pressure stabilizing tank (13) is equipped with a pressure regulating valve to regulate the medium pressure of the sealed pipeline (2). The pressure stabilizing tank (13) is equipped with a pressure stabilizing tank exhaust valve (1301) at the top and a pressure stabilizing tank vent valve (1302) at the bottom.

5. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, The sealed pipeline (2) is equipped with a manual valve (14) and a one-way check valve (15) on the side near the discharge port, and a back pressure valve (16) is equipped on the side near the return port.

6. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to any one of claims 1-5, characterized in that, A pressure relief pipe (17) is connected in parallel to the upstream of the sealed pipe (2) and near the test area, and the end of the pressure relief pipe (17) is connected to the medium storage tank (1).

7. A comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 6, characterized in that, To meet the testing requirements for the performance of the control valve under test, the medium storage tank (1) is filled with neutral fluid, alkaline fluid or acidic fluid.

8. The comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, The data acquisition system (9) includes, but is not limited to, a high-speed camera and a scanning electron microscope. By changing the opening degree of the valve in the test tube assembly and using particle image velocimetry technology, the transient velocity field data of the flow field of the valve at different opening degrees are obtained. The flow characteristics of the fluid passing through the valve are obtained by computer analysis.

9. A comprehensive test bench for control valve performance based on particle image velocimetry technology according to claim 1, characterized in that, The sealing pipeline (2) is provided with an opening and closing adjustment hole downstream of the test area. When the valve sealing performance test is carried out, the control valve to be tested in the test pipe assembly (5) is closed, and the valve sealing performance is quantitatively analyzed by collecting the leakage medium in the adjustment hole.

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