LNG low-temperature high-pressure immersed pump hydraulic test system

Abstract

The utility model relates to the field of hydraulic detection, and provides an LNG (Liquefied Natural Gas) low-temperature and high-pressure immersed pump hydraulic test system, which aims at solving the problems that the existing immersed pump test system is complicated in structure, difficult to accurately position a fault part and the like, and comprises a hydraulic unit, a test control unit, a test board and a tested assembly, the hydraulic unit comprises an oil tank, a driving motor, a metering pump, a one-way valve, a speed regulating valve and an electromagnetic reversing valve; a weighing sensor is arranged between the test board and the tested assembly, and the tested assembly comprises an LNG low-temperature high-pressure immersed pump, a low-temperature medium storage tank and a heat exchanger; the electromagnetic reversing valve is connected with the LNG low-temperature high-pressure immersed pump through a hydraulic hose, and the output end of the heat exchanger is connected with a first low-temperature stop valve and a low-temperature overflow valve. A second low-temperature stop valve and a first pressure sensor are arranged in parallel with the low-temperature overflow valve, and the test control unit is used for controlling a switch of the driving motor, controlling the reversing frequency of the electromagnetic reversing valve and monitoring and collecting monitoring data of the weighing sensor and the first pressure sensor.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic testing systems, specifically to a hydraulic testing system for an LNG cryogenic high-pressure submersible pump. Background Technology

[0002] LNG cryogenic high-pressure submerged pumps are key equipment in the liquefied natural gas industry chain. They have advantages such as high efficiency, low noise, safety and reliability and long service life. LNG cryogenic high-pressure submerged pumps usually adopt a multi-stage centrifugal structure, with large flow rate and head, and are suitable for large FLNG ships and vehicle-mounted LNG gas supply systems.

[0003] The motion control system of the LNG cryogenic high-pressure submersible pump is related to the engine's operating status. Therefore, the LNG cryogenic high-pressure submersible pump is usually bench-tested in conjunction with the engine to test its performance. Then, it is actually installed in a vehicle for road testing to verify whether the various performance characteristics of the LNG cryogenic high-pressure submersible pump meet the actual use requirements.

[0004] However, the existing test system for cryogenic high-pressure LNG submersible pumps has a relatively complex structure and a long test cycle, which is not conducive to the performance testing of LNG cryogenic high-pressure LNG submersible pumps during the research and development stage and the mass production stage. Furthermore, when problems are found, it is difficult to accurately locate the faulty part, and the accuracy and reliability of various performance test data need to be improved. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of existing LNG cryogenic high-pressure submersible pump test systems, such as complex structure, long test cycle, which are not conducive to performance testing of LNG cryogenic high-pressure submersible pumps in the research and development and mass production stages, and difficulty in accurately locating faulty parts. Therefore, this invention proposes a hydraulic test system for LNG cryogenic high-pressure submersible pumps.

[0006] To achieve the above objectives, the technical solution proposed by this utility model is as follows:

[0007] An LNG cryogenic high-pressure submersible pump hydraulic test system includes a hydraulic unit, a test control unit, a test bench, and the component under test mounted on the test bench. Its distinctive feature is that:

[0008] The hydraulic unit includes an oil tank and a drive motor. A metering pump, a check valve, a speed control valve and a solenoid directional valve are sequentially installed on the oil outlet pipe of the oil tank. The drive motor is used to drive the metering pump to draw oil from the oil tank for pressurization.

[0009] At least one weighing sensor is provided between the test bench and the component under test for real-time acquisition of the weight of the component under test.

[0010] The tested components include an LNG cryogenic high-pressure submerged pump, a cryogenic medium storage tank, and a heat exchanger; the output end and return oil input end of the electromagnetic reversing valve are respectively connected to the hydraulic oil inlet end and outlet end of the LNG cryogenic high-pressure submerged pump 171, and the return oil output end of the electromagnetic reversing valve is connected to the oil tank, which is used to drive the LNG cryogenic high-pressure submerged pump to reciprocate.

[0011] The LNG cryogenic high-pressure submersible pump is installed obliquely inside the cryogenic medium storage tank, with the drive hydraulic cylinder of the LNG cryogenic high-pressure submersible pump extending beyond the outlet end of the cryogenic medium storage tank. The LNG cryogenic high-pressure submersible pump, inlet check valve, outlet check valve, and heat exchanger are integrated into a single structure. The LNG cryogenic high-pressure submersible pump draws in the cryogenic medium through the inlet check valve, and after pressurization, it is discharged sequentially through the outlet check valve and the heat exchanger. A first cryogenic shut-off valve and a cryogenic overflow valve are sequentially connected to the output end of the heat exchanger. A second cryogenic shut-off valve and a first pressure sensor are sequentially installed in parallel on the parallel path of the cryogenic overflow valve. The cryogenic overflow valve and the second cryogenic shut-off valve cooperate to adjust the outlet pressure of the tested component.

[0012] The test control unit is electrically connected to the drive motor, the solenoid directional valve, the weighing sensor, and the first pressure sensor, respectively, and is used to control the switching of the drive motor, control the directional frequency of the solenoid directional valve, and monitor and collect the monitoring data of the weighing sensor and the first pressure sensor.

[0013] Furthermore, a low-temperature pressure gauge is connected between the first low-temperature shut-off valve and the low-temperature overflow valve, and at the rear end of the first pressure sensor, to monitor the outlet pressure of the component under test and transmit the collected data to the test control unit.

[0014] Furthermore, four weighing sensors are installed between the test bench and the component under test to monitor and collect the weight changes of the component under test.

[0015] Furthermore, an oil suction filter and a first shut-off valve are sequentially installed on the pipeline between the oil tank and the metering pump. The oil suction filter is located inside the oil tank, and the first shut-off valve is used to cut off or open the oil flow between the oil tank and the metering pump.

[0016] A post-pump filter and a flow meter are sequentially installed on the oil outlet pipeline between the check valve and the speed control valve. The flow meter is used to monitor the oil flow rate in the test system.

[0017] The oil suction filter, post-pump filter, and flow meter are electrically connected to the test control unit.

[0018] Furthermore, a level gauge is installed inside the oil tank to monitor the oil level.

[0019] The outer wall of the oil tank is also equipped with a level transmitter and a temperature transmitter, which are electrically connected to the test control unit.

[0020] Furthermore, a pressure monitoring pipeline is connected between the one-way valve and the post-pump filter. A second shut-off valve, a pressure gauge, and a second pressure sensor are sequentially installed on the pressure monitoring pipeline to monitor the pressure of the test system. The output end of the second pressure sensor is electrically connected to the test control unit.

[0021] Furthermore, two overflow pipelines connecting the metering pump and the check valve are provided between the metering pump and the oil tank. A third shut-off valve and an overflow valve are respectively provided on the two overflow pipelines, which are used to directly return the hydraulic oil in the metering pump to the oil tank when the test system needs to be interrupted.

[0022] Furthermore, the return oil input end of the electromagnetic reversing valve is connected to the oil tank through a return oil filter, and the return oil filter is electrically connected to the test control unit.

[0023] The beneficial effects of this utility model are:

[0024] (1) The hydraulic test system for LNG cryogenic high pressure submersible pump of this utility model has a simple structure and strong stability. It can test various performance of LNG cryogenic high pressure submersible pump under different working conditions, realize the automated detection of various test data of LNG cryogenic high pressure submersible pump, the operation process is simple, the test cycle is short, and it effectively improves the test efficiency of preliminary performance testing of LNG cryogenic high pressure submersible pump in the research and development stage and the mass production stage. It can be applied to the performance testing of various reciprocating volumetric pumps and has high practicality and applicability.

[0025] (2) This utility model uses the first low temperature shut-off valve, the low temperature overflow valve, the second low temperature shut-off valve and the first pressure sensor to cooperate with each other, adjust the second low temperature shut-off valve and the low temperature overflow valve to adjust the outlet pressure of the tested component, simulate the load performance test and no-load performance test of the tested component, realize the performance test of the tested component under different working conditions, effectively improve the flexibility of the test system, and can accurately locate the fault part in the test process, effectively improve the accuracy and reliability of the various performance test data of the LNG low temperature high pressure submersible pump.

[0026] (3) This utility model adjusts the flow rate of the metering pump and the switching frequency of the electromagnetic reversing valve through the test control unit to simulate the motion law of the LNG cryogenic high-pressure submersible pump under typical working conditions. It can quickly test the various performances of the LNG cryogenic high-pressure submersible pump without connecting to external engine, electric unit and other components, which effectively improves the test efficiency.

[0027] (4) This utility model monitors the overall weight of the component under test by multiple weighing sensors, and monitors the outlet pressure value of the component under test by a low temperature pressure gauge and a first pressure sensor, thereby indirectly calculating the outlet flow rate value of the component under test, which effectively reduces the structural cost of the system. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an embodiment of the LNG cryogenic high-pressure submersible pump hydraulic test system of this utility model;

[0029] Figure 2 This is a schematic diagram illustrating the structural distribution principle of an embodiment of the present utility model;

[0030] Figure 3 This is a top view of the fuel tank in an embodiment of this utility model;

[0031] Figure 4 This is a side view of the component under test in an embodiment of this utility model;

[0032] Figure label:

[0033] 1-Oil tank, 2-Test control unit, 3-Suction filter, 4-First shut-off valve, 5-Drive motor, 6-Metering pump, 7-Third shut-off valve, 8-Relief valve, 9-Check valve, 10-Second shut-off valve, 11-Second pressure sensor, 12-Pressure gauge, 13-Post-pump filter, 14-Flow meter, 15-Speed ​​control valve, 16-Solenoid directional valve, 17-Component under test, 171-LNG cryogenic high-pressure submersible pump, 172-Cryogenic medium storage Tank, 173-Inlet check valve, 174-Drain check valve, 175-Heat exchanger, 18-Weighing sensor, 19-First cryogenic shut-off valve, 20-Cryogenic pressure gauge, 21-First pressure sensor, 22-Second cryogenic shut-off valve, 23-Cryogenic overflow valve, 24-Return oil filter, 25-Level gauge, 26-Level transmitter, 27-Temperature transmitter, 28-Test bench, 29-Heat exchange medium inlet pipe, 30-Heat exchange medium outlet pipe. Detailed Implementation

[0034] like Figure 1 and Figure 2 As shown, an LNG cryogenic high-pressure submersible pump hydraulic test system includes a hydraulic unit, a test control unit 2, a test bench 28, and a component under test 17 mounted on the test bench 28; four weighing sensors 18 are arranged between the test bench 28 and the component under test 17 to monitor and collect the weight changes of the component under test 17.

[0035] like Figure 3As shown, the hydraulic unit includes an oil tank 1, an oil outlet pipeline, and a drive motor 5. A level gauge 25 is installed inside the oil tank 1 to monitor the oil level. A level transmitter 26 and a temperature transmitter 27 are installed on the outer wall of the oil tank 1 to monitor its operating status. The oil outlet pipeline of the oil tank 1 is sequentially equipped with an oil suction filter 3, a first shut-off valve 4, a fixed displacement pump 6, a check valve 9, a post-pump filter 13, a flow meter 14, a speed control valve 15, and a solenoid directional valve 16. The first shut-off valve 4 can be used to cut off the oil flow during system maintenance. Oil flows between tank 1 and the component under test 17; the metering pump 6 is connected to the drive motor 5, and the drive motor 5 drives the metering pump 6 to draw oil from tank 1 and pressurize it, introducing the oil into the component under test 17; the check valve 9 is used to prevent hydraulic oil backflow; the test control unit 2 is electrically connected to the drive motor 5, the solenoid directional valve 16, the weighing sensor 18 and the first pressure sensor 21 respectively, and is used to control the switching of the drive motor 5, control the switching frequency of the solenoid directional valve 16, and monitor and collect the data of the weighing sensor 18 and the first pressure sensor 21.

[0036] A pressure monitoring pipeline is connected between the one-way valve 9 and the post-pump filter 13. The pressure monitoring pipeline is sequentially equipped with a second shut-off valve 10, a third pressure gauge 12, and a second pressure sensor 11 for monitoring the pressure of the test system. The output end of the second pressure sensor 11, the oil suction filter 3, the post-pump filter 13, and the flow meter 14 are electrically connected to the test control unit 2. The flow meter 14 is used to monitor the flow rate of the test system. The speed control valve 15 adjusts the flow rate of the test system.

[0037] The tested component 17 includes an LNG cryogenic high-pressure submersible pump 171, a cryogenic medium storage tank 172, and a heat exchanger 175, wherein the LNG cryogenic high-pressure submersible pump 171 is a cryogenic high-pressure piston pump.

[0038] The output end and return oil input end of the electromagnetic directional valve 16 are connected to the hydraulic oil inlet end and outlet end of the LNG cryogenic high-pressure submersible pump 171, respectively. The return oil output end of the electromagnetic directional valve 16 is connected to the oil tank 1 and is used to drive the LNG cryogenic high-pressure submersible pump 171 to reciprocate. The return oil input end of the electromagnetic directional valve 16 is connected to the oil tank 1 through the return oil filter 24.

[0039] Two overflow pipes are provided between the metering pump 6 and the check valve 9, connecting to the oil tank 1. A third shut-off valve 7 and an overflow valve 8 are respectively provided on the two overflow pipes, which are used to directly return the hydraulic oil in the metering pump 6 to the oil tank 1 when the test system needs to be interrupted.

[0040] An LNG cryogenic high-pressure submersible pump 171 is installed obliquely inside a cryogenic medium storage tank 172, with the drive hydraulic cylinder of the LNG cryogenic high-pressure submersible pump 171 extending beyond the outlet of the cryogenic medium storage tank 172. The LNG cryogenic high-pressure submersible pump 171, along with the inlet check valve 173, the outlet check valve 174, and the heat exchanger 175, form an integrated structure. The LNG cryogenic high-pressure submersible pump 171 draws in cryogenic medium through the inlet check valve 173, and after pressurization, it is discharged sequentially through the outlet check valve 174 and the heat exchanger 175. A first cryogenic shut-off valve 19 and a cryogenic overflow valve 23 are sequentially connected to the output end of the heat exchanger 175. When adding cryogenic medium to the cryogenic medium storage tank 172, closing the first cryogenic shut-off valve 19 can prevent leakage of the medium inside the cryogenic medium storage tank 172. Opening the first cryogenic shut-off valve 19 allows for performance testing of the tested component 17 under different operating conditions.

[0041] like Figure 4 As shown, a second low-temperature shut-off valve 22 and a first pressure sensor 21 are sequentially arranged on the parallel line of the low-temperature overflow valve 23. Low-temperature pressure gauges 20 are connected between the first low-temperature shut-off valve 19 and the low-temperature overflow valve 23, and at the rear end of the second low-temperature shut-off valve 22, to monitor the outlet pressure of the tested component 17 and transmit the collected data to the test control unit 2.

[0042] When the second cryogenic shut-off valve 22 is fully open, the outlet pressure of the tested component 17 is 0, at which point the test system can be tested for trial operation or no-load performance. When the second cryogenic shut-off valve 22 is fully closed, the cryogenic overflow valve 23 is adjusted by the test control unit 2, thereby adjusting the outlet pressure of the tested component 17, and the test system is tested under load. Then, the outlet pressure of the tested component 17 is monitored by the cryogenic pressure gauge 20 and the first pressure sensor 21, and the weight change of the tested component 17 is monitored by the weighing sensor 18. The outlet flow rate of the tested component 17 is calculated, and the performance test data of the LNG cryogenic high-pressure submersible pump 171 is obtained.

[0043] When conducting performance tests on the LNG cryogenic high-pressure submersible pump 171, if the heat exchanger 175 is not required to participate in the operation, the heat exchange medium inlet pipe 29 and the heat exchange medium outlet pipe 30 of the heat exchanger 175 can be blocked; if the heat exchanger 175 is required to participate in the operation of the LNG cryogenic high-pressure submersible pump 171, the heat exchange medium can be introduced into the heat exchange medium inlet pipe 29 to heat the cryogenic medium pumped out by the LNG cryogenic high-pressure submersible pump 171 before it is discharged.

[0044] When the test needs to be interrupted, the third shut-off valve 7 and the overflow valve 8 can be opened to allow the hydraulic oil in the metering pump 6 to flow directly back to the oil tank 1. This eliminates the need to operate the LNG cryogenic high-pressure submersible pump 171 to stop, thereby improving the stability and safety of the LNG cryogenic high-pressure submersible pump 171 and extending its service life.

[0045] The test control unit 2 is electrically connected to the suction filter 3, drive motor 5, second pressure sensor 11, post-pump filter 13, flow meter 14, solenoid directional valve 16, weighing sensor 18, first pressure sensor 21, return oil filter 24, level transmitter 26, and temperature transmitter 27, respectively. It is used to control and collect data from each component and perform analysis and processing. In the cryogenic high-pressure submersible pump test system of this embodiment, the test control unit 2 only needs to control the on / off state of the drive motor 5 and the operating frequency of the solenoid directional valve 16. Other system status parameters, such as pressure, flow rate, temperature, and liquid level, only need to be displayed in the test control unit 2. Comprehensive monitoring data can be obtained without control, making the operation simple and convenient, and effectively improving the comprehensiveness and reliability of the test data.

[0046] In this embodiment, the test control unit 2 adjusts the flow rate of the metering pump 6 and the switching frequency of the electromagnetic reversing valve 16 to simulate the motion law of the LNG cryogenic high-pressure submersible pump 171 under typical working conditions. Without connecting to external components such as engines and electric units, it can quickly test the various performance characteristics of the LNG cryogenic high-pressure submersible pump 171, effectively improving test efficiency.

[0047] The test control unit 2 can control the start or stop of the drive motor 5, control the switching frequency of the solenoid directional valve 16, and control the opening or closing of each shut-off valve. At the same time, it monitors the operating status of the drive motor 5, monitors the working status of the oil tank 1 through the level transmitter 26 and the temperature transmitter 27, collects the monitoring data of the flow meter 14, the post-pump filter 13, the return oil filter 24, and the pressure values ​​of each pressure sensor, and analyzes and processes them to obtain relevant data for the performance test of the LNG cryogenic high-pressure submersible pump 171. This allows for the testing of various performance characteristics of the LNG cryogenic high-pressure submersible pump 171, effectively improving the test efficiency and accuracy.

Claims

1. A LNG cryogenic high-pressure submerged pump hydraulic test system, comprising a hydraulic unit, a test control unit (2), a test bench (28) and a measured assembly (17) installed on the test bench (28), characterized in that: the hydraulic unit comprises an oil tank (1) and a drive motor (5), and a quantitative pump (6), a one-way valve (9), a speed regulating valve (15) and an electromagnetic reversing valve (16) are sequentially arranged on the oil outlet pipeline of the oil tank (1); the drive motor (5) is used to drive the quantitative pump (6) to suck oil and pressurize from the oil tank (1); at least one weighing sensor (18) is arranged between the test bench (28) and the measured assembly (17) to collect the weight of the measured assembly (17) in real time; the measured assembly (17) comprises a LNG cryogenic high-pressure submerged pump (171), a low-temperature medium storage tank (172) inlet one-way valve (173), a liquid discharge one-way valve (174) and a heat exchanger (175); the output end and the oil return input end of the electromagnetic reversing valve (16) are connected with the hydraulic oil inlet end and the outlet end of the LNG cryogenic high-pressure submerged pump (171) respectively, and the oil return output end of the electromagnetic reversing valve (16) is connected with the oil tank (1), which is used to drive the LNG cryogenic high-pressure submerged pump (171) to reciprocate; the LNG cryogenic high-pressure submerged pump (171) is obliquely inserted into the low-temperature medium storage tank (172), and the drive hydraulic cylinder end of the LNG cryogenic high-pressure submerged pump (171) extends out of the outlet end of the low-temperature medium storage tank (172); the LNG cryogenic high-pressure submerged pump (171) is an integrated structure with the inlet one-way valve (173), the liquid discharge one-way valve (174) and the heat exchanger (175), and the LNG cryogenic high-pressure submerged pump (171) sucks in low-temperature medium through the inlet one-way valve (173), and discharges after pressurization through the liquid discharge one-way valve (174) and the heat exchanger (175) in sequence; the output end of the heat exchanger (175) is sequentially connected with a first low-temperature stop valve (19) and a low-temperature overflow valve (23); a second low-temperature stop valve (22) and a first pressure sensor (21) are sequentially arranged on the parallel path of the low-temperature overflow valve (23), and the low-temperature overflow valve (23) and the second low-temperature stop valve (22) cooperate to adjust the outlet pressure of the measured assembly (17); the test control unit (2) is electrically connected with the drive motor (5), the electromagnetic reversing valve (16), the weighing sensor (18) and the first pressure sensor (21) respectively, and is used to control the switch of the drive motor (5), control the reversing frequency of the electromagnetic reversing valve (16), and monitor and collect the data of the weighing sensor (18) and the first pressure sensor (21).

2. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 1, characterized in that: a low-temperature pressure gauge (20) is connected between the first low-temperature stop valve (19) and the low-temperature overflow valve (23) and the rear end of the first pressure sensor (21), which is used to monitor the outlet pressure of the measured assembly (17) and transmit the collected data to the test control unit (2). ​ ​ 3. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 2, characterized in that: Four weighing sensors (18) are arranged between the test bench (28) and the measured component (17) to monitor and collect the weight change of the measured component (17).

4. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 3, characterized in that: An oil suction filter (3) and a first stop valve (4) are arranged in sequence on the pipeline between the oil tank (1) and the constant pump (6), the oil suction filter (3) is located in the oil tank (1), and the first stop valve (4) is used to cut off or conduct the oil flow between the oil tank (1) and the constant pump (6); A pump post filter (13) and a flow meter (14) are arranged in sequence on the oil outlet pipeline between the one-way valve (9) and the speed regulating valve (15), and the flow meter (14) is used to monitor the oil flow in the test system; The oil suction filter (3), the pump post filter (13) and the flow meter (14) are electrically connected with the test control unit (2) respectively.

5. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 4, characterized in that: A liquid level meter (25) is arranged in the oil tank (1) to monitor the liquid level of the oil in the oil tank (1); A liquid level transmitter (26) and a temperature transmitter (27) are further arranged on the outer wall of the oil tank (1), and the liquid level transmitter (26) and the temperature transmitter (27) are electrically connected with the test control unit (2) respectively.

6. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 5, characterized in that: A pressure monitoring pipeline is connected between the one-way valve (9) and the pump post filter (13), a second stop valve (10), a pressure gauge (12) and a second pressure sensor (11) are arranged in sequence on the pressure monitoring pipeline to monitor the pressure of the test system; the output end of the second pressure sensor (11) is electrically connected with the test control unit (2).

7. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 6, characterized in that: Two overflow pipelines connected with the oil tank (1) are arranged between the constant pump (6) and the one-way valve (9), a third stop valve (7) and an overflow valve (8) are arranged on the two overflow pipelines respectively to directly flow the hydraulic oil in the constant pump (6) back to the oil tank (1) when the test system needs to be interrupted.

8. The LNG cryogenic high-pressure submerged pump hydraulic test system according to claim 7, characterized in that: The oil return input end of the electromagnetic reversing valve (16) is connected with the oil tank (1) through an oil return filter (24), and the oil return filter (24) is electrically connected with the test control unit (2).

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