Gas injection type accumulator flow state test device and test method

Abstract

The application provides a kind of gas injection type pressure accumulator flow state test device and test method.The test device is characterized by comprising: gas injection type pressure accumulator body (26), storage tank (11), pressurization control assembly (37), pressure accumulator inflation assembly (38), filling discharge assembly (39), circulating supply assembly (40), gas supply assembly (41), measurement control assembly (42);The pressurization control assembly (37) provides different flow pressurized gas for the control of storage tank (11), realizes the stable control of the pressure of storage tank (11);The pressure accumulator inflation assembly (38) provides constant flow pressurized gas for gas injection type pressure accumulator body (26);The filling discharge assembly (39) provides liquid filling and discharge for storage tank (11) and gas injection type pressure accumulator body (26).The application can test the influence of liquid flow state change in conveying pipe on the performance of gas injection type pressure accumulator, and can reliably verify the working performance of gas injection type pressure accumulator under liquid flow working condition.

Description

Technical Field

[0001] This invention relates to the field of accumulator testing technology, and more particularly to a test apparatus and method for testing the flow state of an injection-type accumulator. Background Technology

[0002] POGO vibration in liquid rockets is a dynamic instability problem caused by the coupling of pressure pulsations in the propulsion system and longitudinal vibrations of the structure. It affects the low-frequency vibration environment and flight reliability of the launch vehicle. A common method to address this is to install an accumulator between the propellant delivery pipe and the engine to lower the natural frequency of the piping system, thus differentiating it from the natural frequency of the rocket body structure and suppressing the POGO effect. As launch vehicles become larger and their overall frequency decreases, larger accumulator volumes are required. Traditional metal diaphragm accumulators are no longer sufficient. Gas-injection accumulators, which offer simpler manufacturing processes, higher structural efficiency, and larger volumes, will be used in next-generation large launch vehicles.

[0003] Currently, the pressure cycling test method used for performance testing of metal diaphragm accumulators is not suitable for the dynamic performance testing of gas-injected accumulators. A search of existing technologies revealed that patent CN113820136A, "A Pressure Balance Test Device and Test Method for Gas-Injected Accumulators," discloses a pressure balance test device and test method for gas-injected accumulators based on an excitation device. However, this test device is only applicable when the liquid inside the accumulator is in a non-flowing state, falling under the category of static testing, and cannot test the impact of changes in the liquid flow state within the delivery pipe on the performance of the gas-injected accumulator. Therefore, there is an urgent need for a test device that can reliably verify the working performance of gas-injected accumulators under liquid flow conditions, applicable to the research and development testing of gas-injected accumulators. Summary of the Invention

[0004] The purpose of this invention is to provide a test device and method for testing the flow state of an air-injected accumulator, which can test the influence of changes in the flow state of liquid in the delivery pipe on the performance of the air-injected accumulator and reliably verify the working performance of the air-injected accumulator under liquid flow conditions.

[0005] To achieve the above objectives, the present invention provides a flow state testing device for an injection-type accumulator, characterized in that it comprises: an injection-type accumulator body 26, a storage tank 11, a pressure boosting control component 37, an accumulator charging component 38, a filling and discharging component 39, a circulation supply component 40, a gas supply and distribution component 41, and a measurement and control component 42; the pressure boosting control component 37 provides pressurized gas at different flow rates for the stable control of the pressure in the storage tank 11, thereby achieving stable pressure control in the storage tank 11; the accumulator charging component 38 is the injection-type accumulator body 26 provides a constant flow of pressurized gas; the filling and draining assembly 39 provides liquid filling and draining for the storage tank 11 and the gas-filled accumulator body 26; the circulation supply assembly 40 realizes closed-loop circulation of liquid within the test device and has the function of switching between open-loop and closed-loop tests; the gas supply and distribution assembly 41 provides gas source pressures under different conditions for the test device; the measurement and control assembly 42 collects pressure, flow rate and weight information during the test process, and controls the opening and closing of the solenoid valve through pressure feedback, thereby controlling the pressure and liquid level of the system.

[0006] Furthermore, the pressurization control component 37 includes a first solenoid valve 1, a second solenoid valve 2, a first orifice plate 3, and a second orifice plate 4. It is connected in series with a pressurization check valve 5 and a tank exhaust valve 6 via a high-pressure resistant metal hard pipe. One end of the pipeline of the pressurization control component 37 is connected to the high-pressure outlet of the gas distribution platform 33 of the gas distribution component 41, and the other end is connected to the top of the tank 11 at the position between the pressurization check valve 5 and the tank exhaust valve 6. The pressurization check valve 5 and the gas distribution platform 33 include a first branch pipe and a second branch pipe connected in parallel. The first solenoid valve 1 and the first orifice plate 3 are arranged in the first branch pipe, and the second solenoid valve 2 and the second orifice plate 4 are arranged in the second branch pipe.

[0007] Furthermore, the inflation pipeline in the pressurization control component 37 is connected via a VCR connector. The first orifice plate 3 and the second orifice plate 4 are both located inside the inflation pipeline and have the function of disassembly and replacement. The inflation flow rate can be adjusted by using orifice plates of different diameters to meet the inflation flow rate requirements under different liquid flow rate conditions in the storage tank 11. The pressure in the storage tank 11 is maintained within a constant range by the opening and closing of the first solenoid valve 1 and the second solenoid valve 2.

[0008] Furthermore, the accumulator charging assembly 38 includes a third solenoid valve 17, a pressure reducing valve 18, a gas flow meter 19, a flow regulating valve 20, and a charging check valve 21 connected in sequence. The accumulator charging assembly 38 is connected in series with an accumulator exhaust valve 14 and a pipeline venting valve 16 via a metal pipeline. One end of the pipeline is connected to the top of the gas-injection accumulator body 26 at a position between the charging check valve 21 and the accumulator exhaust valve 14, and the other end is connected to the high-pressure outlet of the gas distribution platform 33. The pressure reducing valve 18 maintains a constant downstream pressure output, and the flow regulating valve 20 works together to charge the gas-injection accumulator body 26 with a constant flow rate.

[0009] Furthermore, the circulating supply component 40 includes a second water pump 27 and a second manual shut-off valve 15. The bottom of the storage tank 11 is provided with a first manual shut-off valve 12, which is connected to the air-injection accumulator body 26 through a metal rigid pipe. A branch line is led out after the first manual shut-off valve 12 in series with the second manual shut-off valve 15 and the second water pump 27. The outlet pipe of the second water pump 27 is connected to the downstream pipe of the liquid flow meter 28 and merges. After the merging pipe, a pneumatic ball valve 29 and a pneumatic butterfly valve 30 are connected.

[0010] Furthermore, when the first manual shut-off valve 12 is closed and the second manual shut-off valve 15 is open, the test device is in closed test mode, and the second water pump 27 has a variable frequency speed regulation function. During the test, the pulsating change of the liquid flow rate in the delivery pipe is simulated by the real-time change of the frequency of the circulating water pump. When the first manual shut-off valve 12 is open and the second manual shut-off valve 15 is closed, the test device is in open test mode. A pneumatic ball valve 29 and a pneumatic butterfly valve 30 are installed in the drain pipeline. The required drain flow rate is obtained by adjusting the opening degree of the pneumatic butterfly valve 30.

[0011] Furthermore, the measurement and control component 42 includes a measurement controller 36, a tank level sensor 9, a tank pressure sensor 10, an accumulator level sensor 22, an accumulator pressure sensor Pz, a first temperature sensor Tq for the charging path, a second temperature sensor Tj for the charging path, a first pressure sensor Pq for the charging path, a second pressure sensor Pj for the charging path, a gas flow meter 19, a delivery pipe pressure sensor Pc for the bottom outlet pipe of the gas-injection accumulator body 26, a liquid flow meter 28, and an electronic scale 24. The electronic scale 24 is located below the exhaust and discharge port outlet of the gas-injection accumulator and is used for real-time measurement of the weight of the discharged liquid. The measurement controller 36 collects, records, and stores the signals from each pressure sensor, temperature sensor, level sensor, and electronic scale, and then automatically controls each valve to control the pressure and liquid level of the system.

[0012] Furthermore, the electronic scale 24 has remote data transmission and storage functions.

[0013] Furthermore, glass observation windows are provided on the straight section of the gas-injection accumulator body 26 and the side wall of the delivery pipe. A first camera 25 is provided next to the observation window of the gas-injection accumulator body 26, and a second camera 31 is provided next to the observation window on the side wall of the delivery pipe, for observing the liquid level fluctuation of the gas-injection accumulator body 26 and the liquid entrainment in the delivery pipe during the test.

[0014] Furthermore, the gas supply and distribution assembly 41 includes a high-pressure gas cylinder group 35 and a gas distribution platform 33; the filling and draining assembly 39 includes a first water pump 34 and a filling valve 13. The first water pump 34 of the filling and draining assembly 39 is connected to the filling valve 13 through a plastic hose, and the filling valve 13 is installed at the bottom of the storage tank 11.

[0015] The present invention also provides a method for testing the flow state of an injection-type accumulator, characterized in that it uses the above-mentioned injection-type accumulator flow state testing device and includes the following steps:

[0016] S1 test preparation, including filling tank 11 and the gas-injection accumulator body 26 and pre-pressurizing tank 11;

[0017] The filling of the storage tank 11 and the gas-injection accumulator body 26 includes: turning on the test controller 36, checking and confirming that the initial values ​​of the measurement parameters are all normal, keeping all valves of the test device in the closed state, opening only the storage tank exhaust valve 6, and simultaneously turning on the first water pump 34 and the filling valve 13. When the reading of the storage tank liquid level sensor 9 reaches the set value, the first water pump 34 and the filling valve 13 are turned off. After the liquid level in the storage tank 11 stabilizes, the storage tank exhaust valve 6 is turned off.

[0018] Pre-pressurization of storage tank 11 includes: opening the switch valve of high-pressure gas cylinder group 35, supplying high-pressure gas to pressurization control component 37 and accumulator charging component 38 through gas distribution platform 33, providing low-pressure gas to valve control gas circuit, and alternately controlling the first solenoid valve 1 and the second solenoid valve 2 in pressurization control component 37 and the third solenoid valve 17 in accumulator charging component 38 to charge storage tank 11 and gas-injection accumulator body 26 respectively until the reading of delivery pipe pressure sensor Pc reaches the set value. At the same time, the first camera 25 monitors the liquid level position in gas-injection accumulator body 26 to keep it near the limit hole.

[0019] S2 testing includes open test mode and closed test mode;

[0020] Open test mode: Close the second manual shut-off valve 15, open the first manual shut-off valve 12, open the pneumatic ball valve 29, adjust the control current of the pneumatic butterfly valve 30, observe the reading of the liquid flow meter 28, when the flow rate reaches the set value, keep the opening of the pneumatic butterfly valve 30 unchanged, record the current value, and close the pneumatic ball valve 29; replenish air to the storage tank 11 and the air-injection accumulator body 26 until Pc returns to the set value, while keeping the liquid level in the air-injection accumulator body 26 near the limit hole, and control the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 17 in sequence through the measurement and control component 42. The fourth solenoid valve 23 and the pneumatic ball valve 29 allow high-pressure gas to enter the storage tank 11 through the pressurization control component 37 for pressurization and drainage. Another high-pressure gas enters the gas-injection accumulator body 26 at a constant flow rate through the accumulator charging component 38. The liquid and gas inside the gas-injection accumulator body 26 are discharged through the exhaust and drainage holes. The temperature, pressure, liquid level, and weight parameters at each measuring point are observed and recorded during the test. The gas and liquid states in the gas-injection accumulator body 26 and the delivery pipe are observed through the first camera 25 and the second camera 31. The test ends when the test device runs for the set time.

[0021] Closed-loop test mode: Open the second manual shut-off valve 15 and close the first manual shut-off valve 12. Control the third solenoid valve 17, the fourth solenoid valve 23 and the second water pump 27 in sequence through the measurement and control component 42. High-pressure gas enters the gas-injection accumulator body 26 at a constant flow rate through the accumulator charging component 38. Liquid and gas in the gas-injection accumulator body 26 are discharged through the exhaust and drainage holes. Adjust the frequency of the second water pump 27 to change the liquid flow state. Observe and record the temperature, pressure and weight parameters of each measuring point during the test, and observe the liquid level state in the gas-injection accumulator body 26 through the second camera 31. The test ends when the test device runs for the set time.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] First, the air-injection accumulator flow state test device of the present invention adopts a clever design of two parallel throttling branches with different throttling ring configurations, which can work individually or in combination to achieve a wide range of fine flow regulation. In addition, the air-injection pipeline adopts a VCR connector connection method, which facilitates the installation and replacement of the orifice plate while achieving high-pressure sealing.

[0024] Secondly, the measurement and control component 42 of the present invention has an automatic control function, which integrates the real-time measurement and storage of temperature, pressure, flow rate, liquid level and weight parameters in the test device. In particular, the electronic weighing instrument has remote data transmission and storage functions, which ensures the synchronization of the recording of the liquid discharge weight of the gas-injected accumulator body with the progress of the test, thereby ensuring the high accuracy of the liquid discharge weight measurement of the gas-injected accumulator body.

[0025] Third, the accumulator inflation assembly 38 of the present invention adopts the design of a flow regulating valve and an inflation check valve, which enables the inflation circuit to have a real-time flow regulation function and reduces the disassembly and assembly of the test device; at the same time, it has the ability to prevent the liquid from flowing back into the inflation pipeline due to excessive pressure in the body of the air-injected accumulator, thereby reducing the risk of valve blockage caused by liquid backflow.

[0026] Fourth, the gas-injection accumulator flow state test device of the present invention has a visualization function. The gas-injection accumulator body and the delivery pipeline are equipped with observation windows and cameras, which can be used to observe the liquid level fluctuation and gas-liquid flow state during the test.

[0027] Fifth, the gas-injection accumulator flow state test device of the present invention has the function of switching between open test and closed cycle test. The test mode can be changed by directly reusing most of the equipment and simply switching a few valves.

[0028] In summary, the gas-injection accumulator flow state test device of the present invention can test the influence of changes in the liquid flow state in the delivery pipe on the performance of the gas-injection accumulator, and can reliably verify the working performance of the gas-injection accumulator under liquid flow conditions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the flow state test device for the gas-injection accumulator of the present invention.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1 is the first solenoid valve, 2 is the second solenoid valve, 3 is the first orifice plate, 4 is the second orifice plate, 5 is the booster check valve, 6 is the tank vent valve, 7 is the diffuser, 8 is the tank safety valve, 9 is the tank level sensor, 10 is the tank pressure sensor, 11 is the tank, 12 is the first manual shut-off valve, 13 is the filling valve, 14 is the accumulator vent valve, 15 is the second manual shut-off valve, 16 is the pipeline vent valve, 17 is the third solenoid valve, 18 is the pressure reducing valve, 19 is the gas flow meter, 20 is the flow regulating valve, 21 is the charging check valve, 22 is the accumulator level sensor, 23 is the fourth solenoid valve, 24 is the electronic scale, 25 is the first camera, and 26 is the gas-injection accumulator. The main body consists of: 27 (second water pump), 28 (liquid flow meter), 29 (pneumatic ball valve), 30 (pneumatic butterfly valve), 31 (second camera), 32 (manual drain valve), 33 (gas distribution platform), 34 (first filling valve), 35 (high-pressure gas cylinder group), 36 (measurement controller), 37 (pressurization control component), 38 (accumulator filling component), 39 (filling and draining component), 40 (circulation supply component), 41 (gas supply and distribution component), 42 (measurement control component), Pz (accumulator pressure sensor), Pc (delivery pipe pressure sensor), Tq (first temperature sensor in the filling path), Tj (second temperature sensor in the filling path), Pq (first pressure sensor in the filling path), and Pj (second pressure sensor in the filling path). Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following detailed description of the gas injection accumulator flow state test device and test method proposed in the present invention is provided in conjunction with the accompanying drawings and specific embodiments.

[0033] Figure 1 This is a schematic diagram of the flow state testing device for the gas-injection accumulator of the present invention. Figure 1 As shown, the gas-injection accumulator flow state test device of the present invention includes a gas-injection accumulator body 26, a storage tank 11, a pressurization control component 37, an accumulator charging component 38, a filling and discharging component 39, a circulation supply component 40, a gas supply and distribution component 41, a measurement and control component 42, a first camera 25, and a second camera 31. This device can test the influence of changes in the liquid flow state in the delivery pipe on the performance of the gas-injection accumulator, record the temperature, pressure, liquid level, and weight parameters at each measuring point during the test, and observe the gas and liquid states in the gas-injection accumulator body 26 and the delivery pipe through the cameras.

[0034] The pressurization control component 37 provides pressurized gas at different flow rates to stabilize the pressure of the storage tank 11, thereby achieving stable pressure control of the storage tank 11; the accumulator charging component 38 provides pressurized gas at a constant flow rate to the gas-injected accumulator body 26; the filling and discharging component 39 provides liquid filling and discharging for the storage tank 11 and the gas-injected accumulator body 26; the circulation supply component 40 realizes closed-loop circulation of liquid within the test device; the gas supply and distribution component 41 provides gas source pressures under different conditions for the test device; and the measurement and control component 42 collects pressure, temperature, flow rate, and weight information during the test process and controls the opening and closing of the solenoid valve through pressure feedback.

[0035] Glass observation windows are provided on the straight section of the gas-injection accumulator body 26 and the side wall of the delivery pipe. A first camera 25 is installed next to the observation window of the gas-injection accumulator body 26, and a second camera 31 is installed next to the observation window on the side wall of the delivery pipe, for observing the liquid level fluctuation of the gas-injection accumulator body 26 and the liquid entrainment in the delivery pipe during the test.

[0036] The pressurization control component 37 includes a first solenoid valve 1, a second solenoid valve 2, a first throttling orifice plate 3, and a second throttling orifice plate 4. By coordinating the opening and closing of different solenoid valves, the air flow rate is adjusted to achieve stable control of the pressure in the storage tank 11.

[0037] The first orifice plate 3 and the second orifice plate 4 in the pressurization control component 37 are both located in the air filling pipeline and have the function of disassembly and replacement. By using orifice plates with different diameters in combination, the air filling flow rate can be adjusted to meet the air filling flow rate requirements under different liquid flow rate conditions in the storage tank 11. The pressure of the storage tank 11 is maintained within a constant range by the opening and closing of the first solenoid valve 1 and the second solenoid valve 2.

[0038] The booster control component 37 connects the booster check valve 5 and the tank exhaust valve 6 in series via a high-pressure resistant metal hard pipe. One end of the pipe is connected to the high-pressure outlet of the gas distribution platform 33, and the other end is connected to the top of the tank 11.

[0039] One end of the pipeline of the boost control component 37 is connected to the high-pressure outlet of the gas distribution platform 33, and the other end is connected to the top of the storage tank 11 at the position between the boost check valve 5 and the storage tank exhaust valve 6. The boost check valve 5 and the gas distribution platform 33 are connected in parallel as a first branch pipe and a second branch pipe. The first solenoid valve 1 and the first throttling orifice plate 3 are set in the first branch pipe, and the second solenoid valve 2 and the second throttling orifice plate 4 are set in the second branch pipe.

[0040] The air supply line in the pressurization control component 37 is connected via a VCR connector, which achieves high-pressure sealing while facilitating the installation and replacement of the orifice plate. The metal sealing gasket inside the VCR connector replaces the traditional orifice plate, and a hole is drilled in its center to enable it to function as an orifice plate.

[0041] The top of the storage tank 11 is equipped with a storage tank safety valve 8, a storage tank level sensor 9, and a storage tank pressure sensor 10.

[0042] The accumulator charging assembly 38 includes a third solenoid valve 17, a pressure reducing valve 18, a gas flow meter 19, a flow regulating valve 20, and a charging check valve 21 connected in sequence. The pressure reducing valve 18 and the flow regulating valve 20 work together to charge the accumulator body 26 at the required constant flow rate. The charging check valve 21 prevents liquid backflow into the charging line caused by excessive pressure inside the accumulator body 26, reducing the risk of valve blockage due to liquid backflow.

[0043] The accumulator charging assembly 38 maintains a constant downstream pressure output through the pressure reducing valve 18, and works with the flow regulating valve 20 to charge the air-injection accumulator body 26 at a constant flow rate. The flow regulating valve 20 has a real-time flow regulation function, which reduces the disassembly and assembly of the test device. Before the test, the valve opening is adjusted to achieve the required charging flow rate.

[0044] The accumulator charging assembly 38 is connected in series with the accumulator exhaust valve 14 and the pipeline venting valve 16 via a metal pipeline. One end of the pipeline is connected to the top of the air-injection accumulator body 26, and the other end is connected to the high-pressure outlet of the gas distribution platform 33. A first temperature sensor Tq, a second temperature sensor Tj, a first pressure sensor Pq, and a second pressure sensor Pj are installed on the pipeline.

[0045] The filling and draining assembly 39 includes a first water pump 34 and a filling valve 13, which realizes the filling and draining of liquid in the storage tank 11 and the gas-filled accumulator body 26.

[0046] The first water pump 34 of the filling and draining assembly 39 is connected to the filling valve 13 via a plastic hose. The filling valve 13 is installed at the bottom of the storage tank 11.

[0047] The circulating supply component 40 includes a second water pump 27 and a second manual shut-off valve 15, which switches from an open flow state to a closed circulating flow state through the opening and closing switching test device of the second manual shut-off valve 15.

[0048] The bottom of the storage tank 11 is equipped with a first manual shut-off valve 12, which is connected to the air-injection accumulator body 26 through a metal rigid pipe. A pressure sensor Pc is installed on the outlet delivery pipe of the air-injection accumulator body 26. A branch line is led out after the first manual shut-off valve 12 and connected in series with the second water pump 27 and the second manual shut-off valve 15. The outlet pipe of the second water pump 27 is connected to the downstream pipe of the liquid flow meter 28 and merges. After the merging pipe, a pneumatic ball valve 29 and a pneumatic butterfly valve 30 are connected.

[0049] The circulating supply component 40 has an open-loop test and closed-loop test switching function, which is achieved by switching the opening and closing of the first manual shut-off valve 12 and the second manual shut-off valve 15.

[0050] When the first manual shut-off valve 12 is closed and the second manual shut-off valve 15 is open, the test device is in closed test mode. The second water pump 27 has a variable frequency speed regulation function. During the test, the pulsating change of the liquid flow rate in the delivery pipe is simulated by the real-time change of the frequency of the circulating water pump.

[0051] When the first manual shut-off valve 12 is in the open state and the second manual shut-off valve 15 is in the closed state, the test device is in open test mode. A pneumatic ball valve 29 and a pneumatic butterfly valve 30 are installed in the drain line. The required drain flow rate is obtained by adjusting the opening degree of the pneumatic butterfly valve 30.

[0052] The gas supply and distribution assembly 41 includes a high-pressure gas cylinder group 35 and a gas distribution platform 33, which provide gas source pressures under different conditions for the test device.

[0053] The measurement and control component 42 is used to collect pressure, temperature, flow rate and weight information during the test, and to control the opening and closing of the solenoid valve through pressure feedback.

[0054] The measurement and control component 42 includes a measurement controller 36, a tank level sensor 9, a tank pressure sensor 10, an accumulator level sensor 22, an accumulator pressure sensor Pz, a delivery pipe pressure sensor Pc, a first temperature sensor Tq for the charging path, a second temperature sensor Tj for the charging path, a first pressure sensor Pq for the charging path, a second pressure sensor Pj for the charging path, a gas flow meter 19, a liquid flow meter 28, and an electronic scale 24. The electronic scale 24 is located below the outlet of the vent and drain hole of the gas-injection accumulator and is used for real-time measurement of the weight of the discharged liquid. The signals from each sensor are connected to the measurement controller 36 via a bus. The measurement controller 36 collects, records, and stores the signals from each pressure sensor, temperature sensor, level sensor, and electronic scale, and then automatically controls each valve to control the system's pressure and liquid level.

[0055] The electronic scale 24 in the measurement and control component 42 has remote data transmission and storage functions, ensuring the synchronization of the recording of the liquid discharge weight of the gas-injected accumulator body 26 with the progress of the test, thereby ensuring the high accuracy of the liquid discharge weight measurement of the gas-injected accumulator body 26.

[0056] The present invention also provides a testing method for the above-mentioned test apparatus, comprising the following steps.

[0057] S1 test preparation includes filling the storage tank 11 and the gas-injection accumulator body 26, and pre-pressurizing the storage tank 11. After filling the storage tank 11 and the gas-injection accumulator body 26, the test controller 36 is turned on. The initial values ​​of the measured parameters are checked and confirmed to be normal. All valves of the test device are kept closed, except for the storage tank exhaust valve 6. Simultaneously, the first water pump 34 and the filling valve 13 are turned on. When the reading of the storage tank level sensor 9 reaches the set value, the first water pump 34 is turned off, and the filling valve 13 is turned off. After the liquid level in the storage tank 11 stabilizes, the storage tank exhaust valve 6 is turned off.

[0058] The storage tank 11 is pre-pressurized. The high-pressure gas cylinder group 35 switch valve is opened, and high-pressure gas is delivered to the pressurization control component 37 and the accumulator charging component 38 through the gas distribution platform 33. Low-pressure gas is provided to the valve control gas circuit. The first solenoid valve 1 and the second solenoid valve 2 in the pressurization control component 37 and the third solenoid valve 17 in the accumulator charging component 38 are alternately controlled to charge the storage tank 11 and the gas-injection accumulator body 26 respectively until the pressure sensor Pc reading of the delivery pipe reaches the set value. At the same time, the liquid level in the gas-injection accumulator body 26 is monitored through the first camera 25 to keep it near the limit hole.

[0059] S2 testing includes open test mode and closed test mode;

[0060] In open test mode, close the second manual shut-off valve 15, open the first manual shut-off valve 12, open the pneumatic ball valve 29, adjust the control current of the pneumatic butterfly valve 30, observe the reading of the liquid flow meter 28, and when the flow rate reaches the set value, keep the opening of the pneumatic butterfly valve 30 unchanged, record the current value, and close the pneumatic ball valve 29; replenish air to the storage tank 11 and the air-injection accumulator body 26 until Pc returns to the set value, while keeping the liquid level in the air-injection accumulator body 26 near the limit hole, and control the first solenoid valve 1, the second solenoid valve 2, and the third solenoid valve 17 in sequence through the measurement controller 36. The fourth solenoid valve 23 and the pneumatic ball valve 29 allow high-pressure gas to enter the storage tank 11 through the pressurization control component 37 for pressurization and drainage. Another high-pressure gas enters the gas-injection accumulator body 26 at a constant flow rate through the accumulator charging component 38. The liquid and gas inside the gas-injection accumulator body 26 are discharged through the exhaust and drainage holes. The temperature, pressure, liquid level, and weight parameters at each measuring point are observed and recorded during the test. The gas and liquid states in the gas-injection accumulator body 26 and the delivery pipe are observed through the first camera 25 and the second camera 31. The test ends when the test device runs for the set time.

[0061] In the closed-loop test mode, the second manual shut-off valve 15 is opened and the first manual shut-off valve 12 is closed. The third solenoid valve 17, the fourth solenoid valve 23, and the second water pump 27 are controlled sequentially by the measurement controller 36. High-pressure gas enters the gas-injection accumulator body 26 at a constant flow rate through the accumulator charging component 38. The liquid and gas in the gas-injection accumulator body 26 are discharged through the exhaust and drainage holes. The frequency of the second water pump 27 is adjusted to change the liquid flow state. The temperature, pressure, and weight parameters at each measuring point are observed and recorded during the test, and the liquid level in the gas-injection accumulator body 26 is observed by the second camera 31. The test ends when the test device runs for the set time.

[0062] In one embodiment, the testing method of the above-described test apparatus of the present invention includes the following steps:

[0063] S1 Test Preparation: Turn on the test controller 36, open only the tank exhaust valve 6, and simultaneously turn on the first water pump 34 and the filling valve 13. When the tank level sensor 9 reaches the set value, turn off the first water pump 34 and the filling valve 13 to complete the filling of the tank 11. Turn on the high pressure gas cylinder group 35 switch valve and the gas distribution platform 33, and alternately control the first solenoid valve 1, the second solenoid valve 2 and the third solenoid valve 17 in the accumulator charging assembly 38 to charge the tank 11 and the gas-injecting accumulator body 26 respectively until the pressure sensor Pc of the delivery pipe reaches the set value. At the same time, monitor the liquid level position inside the gas-injecting accumulator body 26 through the first camera 25 to keep it near the limit hole to complete the pre-pressurization of the tank 11.

[0064] S2 test, open test: Close the second manual shut-off valve 15, open the first manual shut-off valve 12, open the pneumatic ball valve 29, adjust the control current of the pneumatic butterfly valve 30, observe the reading of the liquid flow meter 28, when the flow rate reaches the set value, keep the opening of the pneumatic butterfly valve 30 unchanged, and close the pneumatic ball valve 29; replenish the storage tank 11 and the gas injection accumulator body 26 with gas until Pc returns to the set value, while keeping the liquid level in the gas injection accumulator body 26 near the limit hole, and control the first solenoid valve 1, the second solenoid valve 2, the third solenoid valve 17, the fourth solenoid valve 23 and the pneumatic ball valve 29 in sequence. High-pressure gas enters the storage tank 11 for pressurization and drainage, and another high-pressure gas enters the gas injection accumulator body 26 at a constant flow rate. The liquid and gas in the gas injection accumulator body 26 are discharged through the exhaust and drainage holes. The test ends when the test device runs for the set value.

[0065] In the closed test mode, open the second manual shut-off valve 15 and close the first manual shut-off valve 12. Control the third solenoid valve 17, the fourth solenoid valve 23 and the second water pump 27 in sequence. High-pressure gas enters the gas-injection accumulator body 26 at a constant flow rate through the accumulator charging component 38. Liquid and gas in the gas-injection accumulator body 26 are discharged through the exhaust and drainage holes. Adjust the frequency of the second water pump 27 to change the liquid flow state. The test ends when the test device runs for the set time.

[0066] The measurement and control component 42 records the temperature, pressure, liquid level and weight parameters at each measuring point during the test, and observes the gas and liquid state in the gas injection accumulator body 26 and the delivery pipe through the first camera 25 and the second camera 31.

[0067] During the test, the temperature, pressure, liquid level and weight parameters of each measuring point are recorded by the measurement and control component 42, and the gas and liquid status in the gas injection accumulator body 26 and the delivery pipe are observed by the first camera and the second camera.

[0068] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A flow state testing device for an injection-type accumulator, characterized in that, include: The accumulator body (26), storage tank (11), pressure control component (37), accumulator charging component (38), filling and draining component (39), circulation supply component (40), gas supply and distribution component (41), and measurement and control component (42) are as follows: The pressure control component (37) provides pressurized gas with different flow rates to stabilize the pressure of the storage tank (11), thereby achieving stable pressure control of the storage tank (11); The accumulator charging component (38) provides pressurized gas with a constant flow rate to the accumulator body (26). The filling and draining assembly (39) provides liquid filling and draining for the storage tank (11) and the gas-filled accumulator body (26); the circulating supply assembly (40) realizes closed-loop circulation of liquid in the test device and has the function of switching between open test and closed-loop test; the gas supply and distribution assembly (41) provides gas source pressure in different states for the test device; the measurement and control assembly (42) collects pressure, flow and weight information during the test process, and controls the opening and closing of the solenoid valve through pressure feedback, thereby controlling the pressure and liquid level of the system; The circulating supply component (40) includes a second water pump (27) and a second manual shut-off valve (15). The bottom of the storage tank (11) is provided with a first manual shut-off valve (12) and is connected to the air-injection accumulator body (26) through a metal hard pipe. A branch line is led out after the first manual shut-off valve (12) and connected in series with the second manual shut-off valve (15) and the second water pump (27). The outlet pipeline of the second water pump (27) is connected to the pipeline after the liquid flow meter (28) and merges. After the merged pipeline, a pneumatic ball valve (29) and a pneumatic butterfly valve (30) are connected. When the first manual shut-off valve (12) is closed and the second manual shut-off valve (15) is open, the test device is in closed test mode. The second water pump (27) has variable frequency speed regulation function. During the test, the pulsating change of liquid flow in the delivery pipe is simulated by the real-time change of the frequency of the circulating water pump. When the first manual shut-off valve (12) is open and the second manual shut-off valve (15) is closed, the test device is in open test mode. A pneumatic ball valve (29) and a pneumatic butterfly valve (30) are installed in the drain pipeline. The required drain flow rate is obtained by adjusting the opening degree of the pneumatic butterfly valve (30).

2. The flow state test apparatus for an injection-type accumulator as described in claim 1, characterized in that, The boosting control component (37) includes a first solenoid valve (1), a second solenoid valve (2), a first throttling orifice plate (3), and a second throttling orifice plate (4). It is connected in series with a boosting check valve (5) and a tank exhaust valve (6) through a high-pressure resistant metal hard pipe. One end of the pipeline of the boosting control component (37) is connected to the high-pressure outlet of the gas distribution platform (33) of the gas distribution component (41), and the other end is connected to the top of the tank (11) at the position between the boosting check valve (5) and the tank exhaust valve (6). The boosting check valve (5) and the gas distribution platform (33) include a first branch pipe and a second branch pipe connected in parallel. The first solenoid valve (1) and the first throttling orifice plate (3) are set in the first branch pipe, and the second solenoid valve (2) and the second throttling orifice plate (4) are set in the second branch pipe.

3. The flow state test apparatus for an injection-type accumulator as described in claim 2, characterized in that, The inflation pipeline in the pressurization control component (37) is connected by a VCR connector. The first orifice plate (3) and the second orifice plate (4) are both located in the inflation pipeline and have the function of disassembly and replacement. The inflation flow rate is adjusted by the use of orifice plates with different diameters to meet the inflation flow rate requirements of different liquid flow rates in the storage tank (11). The pressure of the storage tank (11) is maintained within a constant range by the opening and closing of the first solenoid valve (1) and the second solenoid valve (2).

4. The flow state test apparatus for an injection-type accumulator as described in claim 1, characterized in that, The accumulator charging assembly (38) includes a third solenoid valve (17), a pressure reducing valve (18), a gas flow meter (19), a flow regulating valve (20), and a charging check valve (21) connected in sequence. The accumulator charging assembly (38) is connected in series with an accumulator exhaust valve (14) and a pipeline venting valve (16) through a metal pipeline. One end of the pipeline is connected to the top of the gas-injection accumulator body (26) between the charging check valve (21) and the accumulator exhaust valve (14), and the other end is connected to the high-pressure outlet of the gas distribution platform (33). The pressure reducing valve (18) maintains a constant downstream pressure output, and the flow regulating valve (20) charges the gas-injection accumulator body (26) with a constant flow rate.

5. The flow state test apparatus for an injection-type accumulator as described in claim 1, characterized in that, The measurement and control assembly (42) includes a measurement controller (36), a tank level sensor (9), a tank pressure sensor (10), an accumulator level sensor (22), an accumulator pressure sensor Pz, a first temperature sensor Tq for the charging path, a second temperature sensor Tj for the charging path, a first pressure sensor Pq for the charging path, a second pressure sensor Pj for the charging path, a gas flow meter (19), a delivery pipe pressure sensor Pc for the bottom outlet pipe of the gas-injection accumulator body (26), a liquid flow meter (28), and an electronic scale (24). The electronic scale (24) is located below the outlet of the gas-injection accumulator's exhaust and liquid discharge hole and is used for real-time measurement of the weight of the discharged liquid. The measurement controller (36) collects, records, and stores the signals from each pressure sensor, temperature sensor, level sensor, and electronic scale, and then automatically controls each valve to control the system's pressure and liquid level. The electronic scale (24) has remote data transmission and storage functions.

6. The flow state test apparatus for an injection-type accumulator as described in claim 1, characterized in that, The straight section of the gas-injection accumulator body (26) and the side wall of the delivery pipe are equipped with glass observation windows. A first camera (25) is installed next to the observation window of the gas-injection accumulator body (26), and a second camera (31) is installed next to the observation window of the side wall of the delivery pipe, which are used to observe the liquid level fluctuation of the gas-injection accumulator body (26) and the liquid entrainment in the delivery pipe during the test.

7. The flow state test apparatus for an injection-type accumulator as described in claim 1, characterized in that, The gas supply and distribution assembly (41) includes a high-pressure gas cylinder group (35) and a gas distribution platform (33); the filling and draining assembly (39) includes a first water pump (34) and a filling valve (13). The first water pump (34) of the filling and draining assembly (39) is connected to the filling valve (13) through a plastic hose. The filling valve (13) is installed at the bottom of the storage tank (11).

8. A method for testing the flow state of an injection-type accumulator, characterized in that, The method of using the gas-injection accumulator flow state test apparatus according to any one of claims 1 to 7 includes the following steps: S1 test preparation, including filling the storage tank (11) and the gas-injected accumulator body (26) and pre-pressurizing the storage tank (11); The filling of the storage tank (11) and the gas-filled accumulator body (26) includes: turning on the measurement controller (36), checking and confirming that the initial values ​​of the measurement parameters are normal, keeping all valves of the test device in the closed state, opening only the storage tank exhaust valve (6), and simultaneously turning on the first water pump (34) and the filling valve (13). When the reading of the storage tank level sensor (9) reaches the set value, turn off the first water pump (34) and the filling valve (13). After the liquid level in the storage tank (11) stabilizes, turn off the storage tank exhaust valve (6). The pre-pressurization of the storage tank (11) includes: opening the switch valve of the high-pressure gas cylinder group (35), supplying high-pressure gas to the pressurization control component (37) and the accumulator charging component (38) through the gas distribution platform (33), providing low-pressure gas to the valve control gas circuit, and alternately controlling the first solenoid valve (1), the second solenoid valve (2) in the pressurization control component (37) and the third solenoid valve (17) in the accumulator charging component (38) to charge the storage tank (11) and the gas-injection accumulator body (26) respectively until the reading of the delivery pipe pressure sensor Pc reaches the set value. At the same time, the liquid level position inside the gas-injection accumulator body (26) is monitored through the first camera (25) to keep it near the limit hole. S2 testing includes open test mode and closed test mode; Open test mode: Close the second manual shut-off valve (15), open the first manual shut-off valve (12), open the pneumatic ball valve (29), adjust the control current of the pneumatic butterfly valve (30), observe the reading of the liquid flow meter (28), when the flow reaches the set value, keep the opening of the pneumatic butterfly valve (30) unchanged, record the current value, and close the pneumatic ball valve (29); replenish the storage tank (11) and the gas-injection accumulator body (26) with gas until Pc returns to the set value, while keeping the liquid level in the gas-injection accumulator body (26) near the limit hole, and control the first solenoid valve (1), the second solenoid valve (2), and the third solenoid valve (28) in sequence through the measurement control component (42). 17) The fourth solenoid valve (23) and the pneumatic ball valve (29) allow high-pressure gas to enter the storage tank (11) through the pressurization control component (37) for pressurization and drainage. Another high-pressure gas enters the gas-injection accumulator body (26) at a constant flow rate through the accumulator charging component (38). The liquid and gas in the gas-injection accumulator body (26) are discharged through the exhaust and drainage holes. The temperature, pressure, liquid level and weight parameters of each measuring point are observed and recorded during the test. The gas and liquid status of the gas-injection accumulator body (26) and the delivery pipe are observed through the first camera (25) and the second camera (31). The test ends when the test device runs for the set time. Closed test mode: Open the second manual shut-off valve (15), close the first manual shut-off valve (12), and control the third solenoid valve (17), the fourth solenoid valve (23), and the second water pump (27) in sequence through the measurement control component (42). High pressure gas enters the gas-injection accumulator body (26) at a constant flow rate through the accumulator charging component (38). Liquid and gas in the gas-injection accumulator body (26) are discharged through the exhaust and drainage holes. Adjust the frequency of the second water pump (27) to change the liquid flow state. Observe and record the temperature, pressure, and weight parameters of each measuring point during the test, and observe the liquid level in the gas-injection accumulator body (26) through the second camera (31). The test ends when the test device runs for the set time.

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