Anti-flashback valve testing apparatus and method

Abstract

The application discloses an anti-rebound valve testing device, which comprises a test table, a piston accumulator assembly, a high-pressure gas cylinder and an air compressor connected in sequence, and the test table and the piston accumulator assembly are connected with a hydraulic station respectively; the testing device further comprises a test bench assembly and a spare oil tank; the hydraulic station, the air compressor, the piston accumulator assembly, the test table and the test bench assembly are connected with a lower computer, and the lower computer is connected with an upper computer; the application further discloses a method for testing the anti-rebound valve by using the testing device. The anti-rebound valve testing device is simple in structure, safe and reliable, can provide the required instantaneous cut-off flow during the anti-rebound valve test, and meets the test requirements of the anti-rebound valve pressure test, the main valve core automatic reset test, the emergency cut-off test and the proportional control test; the test process of the test method is closer to the actual working condition of the anti-rebound valve.

Description

Technical Field

[0001] This invention belongs to the field of marine oil drilling equipment technology, specifically relating to an anti-backflow valve testing device. This invention also relates to a method for testing anti-backflow valves using the above-mentioned testing device. Background Technology

[0002] Riser tensioners are crucial equipment in wave compensation systems on floating drilling platforms or drilling vessels, and are indispensable in deep-sea resource extraction. Anti-backflow valves are key components ensuring the stable and reliable operation of riser tensioners. Specifically installed in the fluid passages of the tensioner cylinder and accumulator, these valves primarily control fluid velocity and ensure the safety of the tensioner and riser system. Their main functions include: providing a flow path for the fluid under normal operating conditions; urgently cutting off the fluid passage to protect the tensioner cylinder in case of mechanical failure of the riser tensioner; and controlling the flow rate by adjusting the opening size of the main valve in case of emergency riser detachment, thereby controlling the tensioner tension and protecting the equipment.

[0003] In the development of anti-backflow valves, the testing equipment is a crucial part of the design verification process. Currently, there is no single testing equipment and method that is completely suitable for anti-backflow valves. The only available reference is the testing method using speed-limiting shut-off valves with similar functions. Existing type tests for speed-limiting shut-off valves are mainly achieved in two ways: one is to simulate the shut-off condition using a hydraulic pump source; the other is to simulate the shut-off condition by using a direct-acting hydraulic cylinder with a weight on the cylinder to provide the system's required pressure. For anti-backflow valves used in water-tightening pipe tensioners, the instantaneous shut-off flow rate required by the anti-backflow valve is enormous. The hydraulic pump source method cannot meet the flow supply and response requirements, and neither method can meet the proportional control test requirements of the anti-backflow valve, nor can it reflect the follow-up changes of the hydraulic-pneumatic spring downstream of the anti-backflow valve. Summary of the Invention

[0004] The purpose of this invention is to provide a test device for an anti-backflow valve. This test device can provide the instantaneous cut-off flow required for the anti-backflow valve test and can meet the test requirements of pressure resistance test, main valve core automatic reset test, emergency cut-off test and proportional control test of the anti-backflow valve.

[0005] Another objective of this invention is to provide a method for testing an anti-backflow valve using the aforementioned anti-backflow valve testing device, wherein the testing process of this method is closer to the actual operating conditions of the anti-backflow valve.

[0006] The technical solution adopted in this invention is:

[0007] The anti-backflow valve testing device includes a test bench, a piston accumulator assembly, a high-pressure gas cylinder, and an air compressor connected in sequence. The test bench and the piston accumulator assembly are respectively connected to a hydraulic station. The testing device also includes a test bench assembly and a spare oil tank. The hydraulic station, air compressor, piston accumulator assembly, test bench, and test bench assembly are all connected to a lower-level computer, which is connected to a higher-level computer.

[0008] The invention is further characterized by:

[0009] The hydraulic power unit includes a hydraulic pump. The suction port of the hydraulic pump is connected to the oil tank. The pressure port of the hydraulic pump is connected to the inlet of the check valve. The outlet of the check valve is connected to the inlet of the relief valve, the inlet of pressure sensor A, and the inlet of the filter, respectively. The outlet of the relief valve is connected to the oil tank. The outlet of the filter is connected to the pressure port of the hydraulic power unit. Pressure sensor A is connected to the lower-level machine.

[0010] The piston accumulator assembly includes a piston accumulator. The piston accumulator has a filling port at its liquid end, and a filling check valve is installed at the filling port. The inlet of the filling check valve is connected to the pressure oil port of the hydraulic station. The piston accumulator liquid end is also equipped with a piston displacement sensor and a pressure sensor c. The piston accumulator gas end is connected in sequence to the outlet of the high-pressure gas cylinder and the outlet of the air compressor. A normally open ball valve is installed on the pipeline connecting the piston accumulator gas end and the high-pressure gas cylinder. The piston accumulator gas end is also equipped with a safety valve. Both the gas end and liquid end of the piston accumulator are equipped with pressure sensors d. Pressure sensors d, piston displacement sensors, and pressure sensors c are all connected to the lower-level machine.

[0011] The test bench includes a proportional throttle valve. The inlet of the proportional throttle valve is connected to the inlet of the electromagnetic unloading valve, and the pressure oil inlets A and B of the test bench. The outlet of the electromagnetic unloading valve is connected to the return port of the hydraulic station through a hydraulic pipeline. An oil inlet check valve is installed at the pressure oil inlet A of the test bench. The pressure oil inlet B of the test bench is connected to the liquid end port of the piston accumulator assembly. Both the proportional throttle valve and the electromagnetic unloading valve are connected to the lower-level machine.

[0012] A ball valve (a) and a pressure sensor (b) are installed at the outlet of the high-pressure gas cylinder.

[0013] The test bench assembly includes a test bench, a lifting pulley system mounted on the top of the test bench, dead rope anchors and winches mounted on the bottom two sides of the test bench, a test cylinder mounted on the test bench, and the piston rod end of the test cylinder connected to the simulated load via a suspension rope; the motor driving the winch is connected to the lower computer.

[0014] The test bench includes a base and a support frame mounted on the base. A lifting pulley assembly is installed on the top of the support frame. Two hydraulic cylinder guide rails extending from the base to the top of the support frame are installed inside the support frame. A lifting device is mounted on the hydraulic cylinder guide rails and is rigidly connected to the hydraulic cylinders. A dead rope fixer and a winch are installed on both sides of the bottom of the support frame. The wire rope on the winch passes through the lifting pulley assembly and is fixed to the dead rope fixer.

[0015] The hydraulic cylinder guide rail is equipped with upward and downward stroke limit protection switches, which are connected to the lower-level machine; the hydraulic cylinder guide rail is also equipped with upward and downward stroke protection buffer cylinders.

[0016] The test cylinder is equipped with a piston position sensor, which is connected to the lower-level computer.

[0017] Another technical solution adopted in this invention is:

[0018] The test method for anti-backflow valves shall be carried out in accordance with the following steps:

[0019] Step 1: Seal the outlet of the anti-backflow valve under test with a flange, connect the inlet of the anti-backflow valve under test to the outlet of the proportional throttle valve on the test bench, install a differential pressure sensor between the inlet and outlet of the anti-backflow valve under test, install ball valves b at both ends of the differential pressure sensor, and connect the anti-backflow valve under test and the differential pressure sensor to the lower-level machine.

[0020] Step 2, Pressure Resistance Test

[0021] Step 2.1: Disconnect the hydraulic station pressure oil port from the piston accumulator liquid end filling port, connect the pressure oil port to the test bench pressure oil inlet A, and at the same time disconnect the test bench pressure oil inlet B from the piston accumulator liquid end oil port, and seal the test bench pressure oil inlet B with flange.

[0022] Step 2.2: The main valve core of the proportional throttle valve on the test bench is fully open, and the anti-backflow valve under test is in normal flow mode with the main valve core fully open; after starting the hydraulic pump to pressurize the system circuit to the required test pressure, the hydraulic pump stops working, and the system begins to maintain pressure;

[0023] Step 2.3: After the pressure holding is completed, the electromagnetic unloading valve of the test bench is energized, the valve core opens, the pressure oil flows back to the oil tank, and the system is depressurized.

[0024] Step 3: Automatic Reset Test of Main Valve Core

[0025] Step 3.1: After the anti-backflow valve under test passes the pressure test, close the solenoid valve core of the test bench electromagnetic unloading valve, adjust the anti-backflow valve under test to the proportional regulation mode, at which time the main valve core is fully open; start the hydraulic pump to fill the system circuit with liquid and pressurize it to the test required pressure, and then stop the hydraulic pump.

[0026] Step 3.2: Operate the anti-backflow valve under test to fully close the main valve core, slowly open the electromagnetic unloading valve, observe whether the main valve core of the anti-backflow valve under test automatically reopens, and record the pressure difference on both sides of the main valve core when it opens.

[0027] Step 4: Emergency Cut-off Test

[0028] Step 4.1: Remove the flange that plugs the outlet of the anti-backflow valve under test, and connect the outlet of the anti-backflow valve under test to the spare oil tank;

[0029] Step 4.2: The proportional throttle valve and electromagnetic unloading valve on the test bench are de-energized and the valve cores are closed; the main valve core of the anti-backflow valve under test is in normal flow state and the main valve core is fully open.

[0030] Step 4.3: Start the air compressor to pre-charge the piston accumulator and high-pressure gas cylinder to the required test pressure; start the hydraulic pump of the hydraulic station to fill and pressurize the piston accumulator, and then stop the hydraulic pump after completion.

[0031] Step 4.4: When the proportional throttle valve is energized, the valve core opens rapidly and fully. Observe whether the main valve core of the anti-backflow valve under test is closed.

[0032] Step 4.5: Based on the changes in the flow rate of the tested anti-backflow valve and the data from the main valve core displacement sensor collected by the host computer, record the trigger closing flow rate of the tested anti-backflow valve and the complete closing time of the main valve core.

[0033] Step 5: Proportional Control Test

[0034] Step 5.1: Disconnect the outlet of the anti-backlash valve under test from the spare oil tank, and connect the outlet of the anti-backlash valve under test to the piston rod chamber of the hydraulic cylinder of the test cylinder;

[0035] Step 5.2: The proportional throttle valve on the test bench is energized, and the valve core is fully open; the main valve core of the anti-backflow valve under test is in normal flow state, and the main valve core is fully open.

[0036] Step 5.3: Start the air compressor to pre-charge the piston accumulator and high-pressure gas cylinder to the required test pressure; start the hydraulic pump of the hydraulic station to fill and pressurize the piston accumulator. During this process, continuously adjust the tension of the wire rope through the winch to ensure that the piston of the test cylinder is in the middle of its stroke when the hoisting rope for lifting the simulated load is taut. Then continue to pressurize the system to the test set pressure.

[0037] Step 5.4: The tested anti-backflow valve enters the proportional control mode. The host computer sends a winch lifting and lowering signal to simulate the movement of the water-proof pipe string relative to the tensioner. The host computer controls the opening degree of the main valve core of the tested anti-backflow valve according to the control curve set therein.

[0038] Step 5.5: After the test is completed, plot the actual proportional control curve of the tested anti-backflow valve based on the data recorded by the system sensors, and compare it with the set curve to determine whether the proportional control function and adjustment characteristics of the tested anti-backflow valve meet the design requirements.

[0039] The beneficial effects of this invention are:

[0040] (1) In the emergency cut-off test, the accumulator and high-pressure gas cylinder can provide a huge instantaneous flow rate in the test device of the present invention; in the proportional control test, the host computer sends a winch control signal to drive the winch to lift and lower the test cylinder with the wire rope, which can simulate the movement of the water-proof pipe string relative to the tensioner. At the same time, the host computer sends a control signal to the anti-backflow valve according to the preset control curve to test the proportional adjustment function and closed-loop adjustment characteristics of the anti-backflow valve, which can verify the performance of the anti-backflow valve more closely with the actual working conditions.

[0041] (2) The proportional control test bench and the hydraulic spring system in the test device of the present invention also meet the test requirements of the riser tensioning system and drill string compensation, which can improve the utilization rate of the test device and reduce the test cost.

[0042] (3) In the emergency cut-off test of the test device of the present invention, the piston speed is calculated based on the piston displacement of the piston accumulator, and then the flow rate and flow rate change are calculated. This can respond to the flow rate change more frequently and quickly, and accurately reflect the flow rate and peak flow rate of the anti-backflow valve cut-off action.

[0043] (4) The experimental device of the present invention uses a proportional throttle valve with a large flow rate and high response speed to obtain a huge flow rate instantaneously from the piston accumulator, which can simulate the load loss condition of the anti-backflow valve, and is simple and reliable. Attached Figure Description

[0044] Figure 1 This is a schematic diagram of the anti-backflow valve testing device of the present invention;

[0045] Figure 2 This is a schematic diagram of the test bench assembly in the anti-backflow valve test device of the present invention.

[0046] In the diagram, 1. Hydraulic station, 1-1. Oil tank, 1-2. Hydraulic pump, 1-3. Check valve, 1-4. Relief valve, 1-5. Pressure sensor a, 1-6. Filter, 2. Air compressor, 3. High-pressure gas cylinder, 3-2. Ball valve a, 3-3. Pressure sensor b, 4. Piston accumulator assembly, 4-1. Piston accumulator, 4-2. Filling check valve, 4-3. Normally open ball valve, 4-4. Pressure sensor d, 4-5. Piston displacement sensor, 4-6. Safety valve, 5. Test bench, 5-1. Proportional throttle valve, 5-2. Anti-backlash valve under test. 5-3. Oil inlet check valve; 5-4. Electromagnetic unloading valve; 5-5. Differential pressure sensor; 5-6. Ball valve b; 6. Spare oil tank; 7. Test cylinder; 7-1. Piston position sensor; 7-2. Lifting rope; 8. Test bench; 8-1. Base; 8-2. Support frame; 8-3. Cylinder guide rail; 8-4. Limit protection switch; 8-5. Lifting device; 8-6. Buffer cylinder; 9. Lifting pulley block; 10. Winch; 10-1. Wire rope; 11. Dead rope fixing device; 12. Simulated load; 13. Lower computer; 14. Upper computer. Detailed Implementation

[0047] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0048] The anti-backflow valve testing device of the present invention has the following structure: Figure 1 As shown, it includes a hydraulic station 1, an air compressor 2, a high-pressure gas cylinder 3, a piston accumulator assembly 4, a test bench 5, a spare oil tank 6, a test bench assembly, a lower-level computer 13, and a higher-level computer 14.

[0049] Test bench 5 is connected in sequence to piston accumulator assembly 4, high-pressure gas cylinder 3 and air compressor 2, and test bench 5 and piston accumulator assembly 4 are both connected to hydraulic station 1; hydraulic station 1, air compressor 2, piston accumulator assembly 4, test bench 5 and test bench assembly are all connected to lower computer 13, and lower computer 13 is connected to upper computer 14.

[0050] Hydraulic station 1 includes hydraulic pump 1-2. The suction port of hydraulic pump 1-2 is connected to oil tank 1-1. The pressure port of hydraulic pump 1-2 is connected to the inlet of check valve 1-3. The outlet of check valve 1-3 is connected to the inlet of relief valve 1-4, the inlet of pressure sensor a1-5, and the inlet of filter 1-6. The outlet of relief valve 1-4 is connected to oil tank 1-1. The outlet of filter 1-6 is connected to the pressure port P of hydraulic station 1. Pressure sensor a1-5 is connected to lower-level machine 13.

[0051] A ball valve a3-2 and a pressure sensor b3-3 are installed at the outlet of the high-pressure gas cylinder 3.

[0052] The piston accumulator assembly 4 includes a piston accumulator 4-1. The piston accumulator 4-1 has a filling port A1 at its liquid end, and a filling check valve 4-2 is installed at the filling port A1. The inlet of the filling check valve 4-2 is connected to the pressure oil port P of the hydraulic station 1. The piston accumulator 4-1 is also equipped with a piston displacement sensor 4-5 and a pressure sensor c at its liquid end. The piston accumulator 4-1 is connected in sequence to the outlet of the high-pressure gas cylinder 3 and the outlet of the air compressor 2. A normally open ball valve 4-3 is installed on the pipeline connecting the piston accumulator 4-1 to the high-pressure gas cylinder 3. The piston accumulator 4-1 is also equipped with a safety valve 4-6 at its liquid end. Both the liquid end and the gas end of the piston accumulator 4-1 are equipped with a pressure sensor d4-4. The pressure sensor d4-4, the piston displacement sensor 4-5, and the pressure sensor c are all connected to the lower-level machine 13.

[0053] Test bench 5 includes a proportional throttle valve 5-1. The inlet B3 of the proportional throttle valve 5-1 is connected to the inlet of the electromagnetic unloading valve 5-4, and the pressure oil inlets A2 and B2 of test bench 5. The outlet of the electromagnetic unloading valve 5-4 is connected to the return port T of the hydraulic station 1 via a hydraulic pipeline. An inlet check valve 5-3 is installed at the pressure oil inlet A2 of test bench 5, which is normally in a blocked state. The pressure oil inlet B2 of test bench 5 is connected to the liquid end port B1 of the piston accumulator assembly 4. Both the proportional throttle valve 5-1 and the electromagnetic unloading valve 5-4 are connected to the lower-level machine 13.

[0054] When testing the anti-backflow valve 5-2, the piston displacement sensor 4-5 at the liquid end of the piston accumulator 4-1 serves as a safety protection device for the piston accumulator 4-1's stroke and a flow rate sensor for the anti-backflow valve 5-2. Based on the parameters of the piston accumulator 4-1 and the trigger flow rate of the anti-backflow valve 5-2, the piston stroke of the piston accumulator 4-1 is set. When the piston stroke exceeds the calculated set value, the system protection function is triggered, and the proportional throttle valve 5-1 of the test bench 5 is shut off to protect the equipment. The piston speed is calculated based on the piston displacement of the piston accumulator 4-1, and then the flow rate and flow change through the anti-backflow valve 5-2 are calculated.

[0055] like Figure 2 As shown, the test bench assembly includes a test bench 8. A lifting pulley block 9 is installed on the top of the test bench 8. A dead rope fixing device 11 and a winch 10 are respectively installed on both sides of the bottom of the test bench 8. A test cylinder 7 is mounted on the test bench 8. The piston rod end of the test cylinder 7 is connected to the simulated load 12 through a suspension rope 7-2. The motor driving the winch 10 is connected to the lower-level machine 13.

[0056] The test bench 8 includes a base 8-1 and a support frame 8-2 mounted on the base. A lifting pulley assembly 9 is installed on the top of the support frame 8-2. Two hydraulic cylinder guide rails 8-3 extending from the base 8-1 to the top of the support frame 8-2 are installed inside the support frame 8-2. A lifting device 8-5 is mounted on the hydraulic cylinder guide rails 8-3 and is rigidly connected to the hydraulic cylinder 7. A dead rope fixing device 11 and a winch 10 are installed on both sides of the bottom of the support frame 8-2. The wire rope 10-1 on the winch 10 passes through the lifting pulley assembly 9 and is fixed to the dead rope fixing device 11. The hydraulic cylinder guide rails 8-3 are equipped with upward and downward travel limit protection switches 8-4. When the hydraulic cylinder lifting device 8-5 triggers the limit protection switch 8-4, the system immediately stops the winch 10 to protect the equipment. The limit protection switch 8-4 is connected to the lower-level machine 13. The hydraulic cylinder guide rail 8-3 is also equipped with an upward and downward stroke protection buffer cylinder 8-6, which stops the hoisting device 8-5 and protects the equipment safety when the winch 10 is out of control or the limit protection switch 8-4 fails.

[0057] The test cylinder 7 is equipped with a piston position sensor 7-1. When the piston displacement of the test cylinder 7 exceeds the maximum / minimum limit value, the system protection function will be triggered, and the system will shut off the liquid supply channel. The piston position sensor 7-1 is connected to the lower-level computer 13.

[0058] The lower-level computer 13 is connected to all sensors, solenoid valves, the tested anti-backflow valve 5-2, and the winch 10 on the test device. It reads the equipment status data and feeds the data back to the upper-level computer 14. The upper-level computer 14 can display and record various signal changes, and make a judgment on whether it is safe to intervene based on the feedback data. It then sends action commands to the lower-level computer 13. The lower-level computer 13 interprets the commands sent by the upper-level computer 14 into corresponding control signals to control the equipment.

[0059] The specific steps of this invention for conducting pressure resistance tests, main valve core automatic reset tests, emergency shut-off tests, and proportional control tests on the anti-backflow valve using the aforementioned testing apparatus are as follows:

[0060] Step 1: Seal the outlet A4 of the anti-backflow valve 5-2 under test with a flange. Connect the inlet B4 of the anti-backflow valve 5-2 under test to the outlet A3 of the proportional throttle valve 5-1 on the test bench 5. Install a differential pressure sensor 5-5 between the inlet B4 and outlet A4 of the anti-backflow valve 5-2 under test. Install ball valves b5-6 at both ends of the differential pressure sensor 5-5. Connect the anti-backflow valve 5-2 under test and the differential pressure sensor 5-5 to the lower-level machine 13.

[0061] Step 2, Pressure Resistance Test

[0062] Step 2.1: Disconnect the connection between the pressure oil port P of hydraulic station 1 and the liquid end filling port A1 of piston accumulator 4-1, connect the pressure oil port P to the pressure oil inlet A2 of test bench 5, and at the same time disconnect the connection between the pressure oil inlet B2 of test bench 5 and the liquid end oil port B1 of piston accumulator 4-1, and seal the pressure oil inlet B2 of test bench 5 with flange.

[0063] Step 2.2: On test bench 5, the main valve core of proportional throttle valve 5-1 is fully open, and the anti-backflow valve 5-2 under test is in normal flow mode with its main valve core fully open; after starting hydraulic pump 1-2 to pressurize the system circuit to the required test pressure, hydraulic pump 1-2 stops working, and the system begins to maintain pressure;

[0064] Step 2.3: After the pressure holding is completed, the electromagnetic unloading valve 5-4 of the test bench 5 is energized, the valve core opens, the pressure oil flows back to the oil tank 1-1, and the system is depressurized.

[0065] Step 3: Automatic Reset Test of Main Valve Core

[0066] Step 3.1: After the anti-backflow valve 5-2 under test passes the pressure test, close the solenoid valve core of the electromagnetic unloading valve 5-4 on the test bench 5, and adjust the anti-backflow valve 5-2 under test to the proportional adjustment mode. At this time, the main valve core is fully open. Start the hydraulic pump 1-2 to fill the system circuit with liquid and pressurize it to the test pressure. After that, the hydraulic pump 1-2 stops working.

[0067] Step 3.2: Operate the tested anti-backflow valve 5-2 to fully close the main valve core, slowly open the electromagnetic unloading valve 5-4, observe whether the main valve core of the tested anti-backflow valve 5-2 automatically reopens, and record the pressure difference on both sides of the main valve core when it opens.

[0068] Step 4: Emergency Cut-off Test

[0069] Step 4.1: Remove the flange sealing the outlet A4 of the anti-backflow valve 5-2 under test, and connect the outlet A4 of the anti-backflow valve 5-2 under test to the spare oil tank 6;

[0070] Step 4.2: The proportional throttle valve 5-1 and the electromagnetic unloading valve 5-4 on the test bench are de-energized and their valve cores are closed; the main valve core of the anti-backflow valve 5-2 under test is in normal flow state and the main valve core is fully open.

[0071] Step 4.3: Start air compressor 2 to pre-charge the piston accumulator 4-1 and high-pressure gas cylinder 3 to the required test pressure; start hydraulic station 1 and hydraulic pump 1-2 to fill and pressurize the piston accumulator 4-1. After completion, hydraulic pump 1-2 stops working.

[0072] Step 4.4: When the proportional throttle valve 5-1 is energized, the valve core will quickly open fully. Observe whether the main valve core of the anti-backflow valve 5-2 under test is closed.

[0073] Step 4.5: Based on the changes in the flow rate of the tested anti-backflow valve 5-2 and the data from the main valve core displacement sensor collected by the host computer 14, record the trigger closing flow rate of the tested anti-backflow valve 5-2 and the complete closing time of the main valve core.

[0074] Step 5: Proportional Control Test

[0075] Step 5.1: Disconnect the connection between outlet A4 of the anti-backlash valve 5-2 under test and the spare oil tank 6, and connect outlet A4 of the anti-backlash valve 5-2 under test to the piston rod chamber of the hydraulic cylinder 7 of the test cylinder;

[0076] Ensure that the piston accumulator 4-1 is reliably connected to the air compressor 2, hydraulic station 1, and test bench 5; that the test bench 5 is reliably connected to the test cylinder 7; that all mechanical installations and connections of the test bench frame 8 are safe and reliable; that the wire rope 10-1 on the winch 10 and the lifting pulley block 9 is correctly and reliably wound; and that the simulated load 12 is reliably connected to the test cylinder 7.

[0077] Step 5.2: The proportional throttle valve 5-1 on the test bench is energized and the valve core is fully open; the main valve core of the anti-backflow valve 5-2 under test is in normal flow state and the main valve core is fully open.

[0078] Step 5.3: Start the air compressor 2 to pre-charge the piston accumulator 4-1 and high-pressure gas cylinder 3 to the required test pressure; start the hydraulic pump 1-2 of the hydraulic station 1 to fill and pressurize the piston accumulator 4-1. During this process, continuously adjust the tension of the wire rope 10-1 through the winch 10 to ensure that the piston of the test cylinder 7 is in the middle of its stroke when the hoisting rope 7-2 for lifting the simulated load 12 is taut. Then continue to pressurize the system to the test set pressure.

[0079] Step 5.4: The tested anti-backflow valve 5-2 enters the proportional control mode. The host computer 14 gives the winch 10 a lifting and lowering signal to simulate the movement of the water-proof pipe string relative to the tensioner. The host computer 14 controls the opening degree of the main valve core of the tested anti-backflow valve 5-2 according to the control curve set therein.

[0080] Step 5.5: After the test is completed, plot the actual proportional control curve of the tested anti-backflow valve 5-2 based on the data recorded by the system sensors, and compare it with the set curve to determine whether the proportional control function and adjustment characteristics of the tested anti-backflow valve 5-2 meet the design requirements.

[0081] In the automatic reset test, emergency shut-off test, and proportional control test of the tested anti-backflow valve 5-2, the test pressure does not need to reach the maximum working pressure designed for the tested anti-backflow valve 5-2. In the automatic reset test, the focus is on ensuring that the pressure at inlet B4 of the tested anti-backflow valve 5-2 decreases from the same pressure as the outlet A4 to the opening pressure of the main valve core reset control valve. In the emergency shut-off test and proportional control test, the test pressure only needs to ensure that the maximum flow rate provided by the piston accumulator 4-1 meets the shut-off trigger flow rate of the tested anti-backflow valve 5-2. Specific values ​​can be determined through simulation based on the flow characteristics of the proportional throttle valve 5-1, parameters 3 of the high-pressure gas cylinder, parameters 4-1 of the piston accumulator, and parameters 7 of the test cylinder.

Claims

1. A test apparatus for anti-backflow valves, characterized in that, The test device includes a test bench (5), a piston accumulator assembly (4), a high-pressure gas cylinder (3), and an air compressor (2) connected in sequence. The test bench (5) and the piston accumulator assembly (4) are respectively connected to the hydraulic station (1). The test device also includes a test bench assembly and a spare oil tank (6). The hydraulic station (1), the air compressor (2), the piston accumulator assembly (4), the test bench (5), and the test bench assembly are all connected to the lower computer (13), and the lower computer (13) is connected to the upper computer (14). The hydraulic station (1) includes a hydraulic pump (1-2), the suction port of the hydraulic pump (1-2) is connected to the oil tank (1-1), the pressure port of the hydraulic pump (1-2) is connected to the inlet of the check valve (1-3), the outlet of the check valve (1-3) is connected to the inlet of the relief valve (1-4), the inlet of the pressure sensor a (1-5) and the inlet of the filter (1-6), the outlet of the relief valve (1-4) is connected to the oil tank (1-1), the outlet of the filter (1-6) is connected to the pressure port P of the hydraulic station (1), and the pressure sensor a (1-5) is connected to the lower computer (13). The piston accumulator assembly (4) includes a piston accumulator (4-1). The piston accumulator (4-1) has a filling port at its liquid end, and a filling check valve (4-2) is installed at the filling port. The inlet of the filling check valve (4-2) is connected to the pressure oil port P of the hydraulic station (1). The piston accumulator (4-1) also has a piston displacement sensor (4-5) and a pressure sensor c at its liquid end. The piston accumulator (4-1) is connected in sequence to the high-pressure gas cylinder (3). The outlet of the air compressor (2) and the pipeline connecting the gas end of the piston accumulator (4-1) to the high-pressure gas cylinder (3) are provided with a normally open ball valve (4-3), and the gas end of the piston accumulator (4-1) is also provided with a safety valve (4-6); the gas end and liquid end of the piston accumulator (4-1) are both provided with pressure sensors d (4-4); the pressure sensors d (4-4), piston displacement sensors (4-5) and pressure sensors c are all connected to the lower-level machine (13). The test bench (5) includes a proportional throttle valve (5-1). The inlet of the proportional throttle valve (5-1) is connected to the inlet of the electromagnetic unloading valve (5-4), the first pressure oil inlet and the second pressure oil inlet of the test bench (5). The outlet of the electromagnetic unloading valve (5-4) is connected to the return oil port T of the hydraulic station (1) through a hydraulic pipeline. The first pressure oil inlet of the test bench (5) is equipped with an oil inlet check valve (5-3). The second pressure oil inlet of the test bench (5) is connected to the liquid end oil port of the piston accumulator assembly (4). The proportional throttle valve (5-1) and the electromagnetic unloading valve (5-4) are both connected to the lower computer (13).

2. The anti-backflow valve testing device according to claim 1, characterized in that, The high-pressure gas cylinder (3) is equipped with a ball valve a (3-2) and a pressure sensor b (3-3) at its outlet.

3. The anti-backflow valve testing device according to claim 2, characterized in that, The test bench assembly includes a test bench (8), a lifting pulley group (9) is installed on the top of the test bench (8), a dead rope fixing device (11) and a winch (10) are installed on the bottom two sides of the test bench (8), a test cylinder (7) is mounted on the test bench (8), and the piston rod end of the test cylinder (7) is connected to the simulated load (12) through a hoisting rope (7-2); the motor driving the winch (10) is connected to the lower machine (13).

4. The anti-backflow valve testing device according to claim 3, characterized in that, The test bench (8) includes a base (8-1) and a support frame (8-2) mounted on the base. The lifting pulley assembly (9) is mounted on the top of the support frame (8-2). Two hydraulic cylinder guide rails (8-3) extending from the base (8-1) to the top of the support frame (8-2) are installed inside the support frame (8-2). A lifting device (8-5) is mounted on the hydraulic cylinder guide rails (8-3). The lifting device (8-5) is rigidly connected to the test hydraulic cylinder (7). The dead rope fixer (11) and the winch (10) are installed on both sides of the bottom of the support frame (8-2). The wire rope (10-1) on the winch (10) passes through the lifting pulley assembly (9) and is fixed on the dead rope fixer (11).

5. The anti-backflow valve testing device according to claim 4, characterized in that, The hydraulic cylinder guide rail (8-3) is provided with an upward and downward stroke limit protection switch (8-4), and the limit protection switch (8-4) is connected to the lower computer (13); the hydraulic cylinder guide rail (8-3) is also provided with an upward and downward stroke protection buffer cylinder (8-6).

6. The anti-backflow valve testing device according to claim 5, characterized in that, The test cylinder (7) is equipped with a piston position sensor (7-1), which is connected to the lower computer (13).

7. A test method for an anti-backflow valve, characterized in that, The anti-backflow valve testing device as described in claim 6 is implemented according to the following steps: Step 1: Seal the outlet of the anti-backflow valve (5-2) under test with a flange, connect the inlet of the anti-backflow valve (5-2) under test to the outlet of the proportional throttle valve (5-1) on the test bench (5), install a differential pressure sensor (5-5) between the inlet and outlet of the anti-backflow valve (5-2) under test, install ball valves b (5-6) at both ends of the differential pressure sensor (5-5), and connect the anti-backflow valve (5-2) under test and the differential pressure sensor (5-5) to the lower computer (13); Step 2, Pressure Resistance Test Step 2.1: Disconnect the connection between the pressure oil port P of the hydraulic station (1) and the liquid end filling port of the piston accumulator (4-1), connect the pressure oil port P to the first pressure oil inlet of the test bench (5), and at the same time disconnect the connection between the second pressure oil inlet of the test bench (5) and the liquid end oil port of the piston accumulator (4-1), and seal the second pressure oil inlet of the test bench (5) with the flange. Step 2.2: On the test bench (5), the main valve core of the proportional throttle valve (5-1) is fully open, and the anti-backlash valve (5-2) under test is in normal flow mode with the main valve core fully open; after starting the hydraulic pump (1-2) to pressurize the system circuit to the required test pressure, the hydraulic pump (1-2) stops working and the system begins to maintain pressure; Step 2.3: After the pressure holding is completed, the electromagnetic unloading valve (5-4) of the test bench (5) is energized, the valve core opens, the pressure oil flows back to the oil tank (1-1), and the system is depressurized; Step 3: Automatic Reset Test of Main Valve Core Step 3.1 After the tested anti-backlash valve (5-2) passes the pressure test, close the solenoid valve core of the electromagnetic unloading valve (5-4) on the test bench (5), and adjust the tested anti-backlash valve (5-2) to the proportional adjustment mode. At this time, the main valve core is fully open. Start the hydraulic pump (1-2) to fill the system circuit with liquid and pressurize it to the test pressure. After that, the hydraulic pump (1-2) stops working. Step 3.2: Operate the tested anti-backflow valve (5-2) to fully close the main valve core, slowly open the electromagnetic unloading valve (5-4), observe whether the main valve core of the tested anti-backflow valve (5-2) automatically reopens, and record the pressure difference on both sides of the main valve core when it opens. Step 4: Emergency Cut-off Test Step 4.1: Remove the flange that plugs the outlet of the anti-backflow valve (5-2) under test, and connect the outlet of the anti-backflow valve (5-2) under test to the spare oil tank (6). Step 4.2: The proportional throttle valve (5-1) and electromagnetic unloading valve (5-4) of the test bench (5) are de-energized and the valve cores are closed; the main valve core of the anti-backflow valve (5-2) under test is in normal flow state and the main valve core is fully open. Step 4.3: Start the air compressor (2) to pre-charge the piston accumulator (4-1) and high-pressure gas cylinder (3) to the required test pressure; start the hydraulic station (1) and hydraulic pump (1-2) to fill and pressurize the piston accumulator (4-1). After completion, the hydraulic pump (1-2) stops working. Step 4.4: When the proportional throttle valve (5-1) is energized, the valve core will quickly open fully. Observe whether the main valve core of the anti-backflow valve (5-2) under test is closed. Step 4.5: Based on the changes in the flow rate of the tested anti-backflow valve (5-2) and the data from the main valve core displacement sensor collected by the host computer (14), record the trigger closing flow rate of the tested anti-backflow valve (5-2) and the complete closing time of the main valve core. Step 5: Proportional Control Test Step 5.1: Disconnect the outlet of the anti-backlash valve (5-2) under test from the spare oil tank (6), and connect the outlet of the anti-backlash valve (5-2) under test to the piston rod chamber of the hydraulic cylinder (7) of the test cylinder. Step 5.2: The proportional throttle valve (5-1) of the test bench (5) is energized and the valve core is fully open; the main valve core of the anti-backflow valve (5-2) under test is in normal flow state and the main valve core is fully open. Step 5.3: Start the air compressor (2) to pre-charge the piston accumulator (4-1) and high-pressure gas cylinder (3) to the required test pressure; start the hydraulic pump (1-2) of the hydraulic station (1) to fill and pressurize the piston accumulator (4-1). During this period, continuously adjust the tension of the wire rope (10-1) through the winch (10) to ensure that the piston of the test cylinder (7) is in the middle of its stroke when the hoisting rope (7-2) for lifting the simulated load (12) is taut. Then continue to pressurize the system to the test set pressure. Step 5.4: The tested anti-backflow valve (5-2) enters the proportional control mode. The host computer (14) gives the winch (10) to lift and lower, simulating the movement of the water-proof pipe string relative to the tensioner. The host computer (14) controls the opening degree of the main valve core of the tested anti-backflow valve (5-2) according to the control curve set therein. Step 5.5: After the test is completed, plot the actual proportional control curve of the tested anti-backlash valve (5-2) based on the data recorded by the system sensors, and compare it with the set curve to determine whether the proportional control function and adjustment characteristics of the tested anti-backlash valve (5-2) meet the design requirements.

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