Centrifugal pump performance test bench

Abstract

The invention belongs to the technical field of pump test devices. The centrifugal pump performance test bench comprises a main oil tank, an auxiliary oil tank, a circulating pump, an outlet flow control system, a fuel oil temperature control system, an electrical control system, a discharge pipeline and a discharge control valve, wherein the outlet flow control system is connected with the centrifugal pump and the main oil tank respectively; the fuel oil temperature control system is connected with the circulating pump; the discharge pipeline is connected with the main oil tank; the main oil tank is connected with the centrifugal pump through an inlet pipeline, and the electrical control system is electrically connected with the outlet flow control system and the fuel oil temperature control system. The main oil tank and the auxiliary oil tank are respectively connected with the circulating pump through an oil discharge pipeline, the fuel oil temperature control system is respectively connected with the auxiliary oil tank through an auxiliary oil return pipeline and connected with the main oil tank through a main oil filling pipeline, and the oil discharge pipeline, the auxiliary oil return pipeline and the main oil filling pipeline are respectively provided with an oil path switch valve which is electrically connected with the electrical control system. The problem that an existing test bed is low in efficiency is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to a centrifugal pump performance test bench, belonging to the technical field of pump test device. BACKGROUND

[0002] As the core component of the aircraft, the performance of the centrifugal pump in the fuel system of the aero-engine directly affects the safety and reliability of the aircraft. In order to test the performance of the centrifugal pump, multiple tests need to be carried out under different medium flow, pressure and temperature conditions. At present, the domestic centrifugal pump test bench generally has the problems of single function and low efficiency, which is difficult to meet the increasing demand for multifunction and high efficiency of centrifugal pump testing.

[0003] The low test efficiency of the centrifugal pump test bench is reflected in many aspects. For example: after the first test record is completed when the medium flow, pressure and temperature parameters are set, the next test record needs to be adjusted to set different flow, pressure and temperature parameters. At this time, the adjustment of the temperature is generally through the heat exchanger in the fuel temperature control system to heat the fuel in the pipeline to achieve the required temperature for the next test. However, the heating of the fuel, such as heating the fuel to a higher temperature required for the next test, is not a one-time process and needs to wait for a certain period of time. Since the performance test of the centrifugal pump needs to be tested multiple times, the waiting period of the fuel heating process will affect the test efficiency. SUMMARY

[0004] The present application aims to provide a centrifugal pump performance test bench to solve the problem of low test efficiency of the existing test bench.

[0005] In order to achieve the above purpose, the technical solution adopted by the present application is:

[0006] A centrifugal pump performance test bench, comprising a main oil tank, an outlet flow control system, a fuel temperature control system, an electrical control system, a discharge pipeline connected with the main oil tank and a discharge control valve arranged on the discharge pipeline; the main oil tank is connected with a centrifugal pump through an inlet pipeline, the outlet flow control system is connected with the centrifugal pump and the main oil tank respectively, and the electrical control system is electrically connected with the outlet flow control system and the fuel temperature control system respectively.

[0007] The centrifugal pump performance test bench further comprises a secondary oil tank and a circulating pump; the main oil tank and the secondary oil tank are connected with the circulating pump through oil discharge pipelines respectively, the circulating pump is connected with the fuel temperature control system, the fuel temperature control system is connected with the secondary oil tank through a secondary oil return pipeline and connected with the main oil tank through a main oil supply pipeline respectively, and oil way on-off valves electrically connected with the electrical control system are arranged on the oil discharge pipelines, the secondary oil return pipeline and the main oil supply pipeline.

[0008] When conducting the first test, all parameters are debugged first, such as setting the flow rate through the outlet flow control system, setting the temperature through the fuel temperature control system, and controlling the power supply through the electrical control system. Then the centrifugal pump starts working to conduct the test, that is, the fuel in the main oil tank is sucked out by the centrifugal pump through the inlet pipeline and then returns to the main oil tank through the outlet flow control system. After the centrifugal pump is working stably, the relevant parameters are recorded to complete the first test. During the first test, when the centrifugal pump is working, that is, when the fuel in the main oil tank is sucked in and returned to the main oil tank, the discharge control valve is closed, the oil circuit switch valve on the main refueling pipeline and the oil discharge pipeline connected to the main oil tank is closed, and the oil circuit switch valve on the auxiliary return pipeline and the oil discharge pipeline connected to the auxiliary oil tank is opened. At this time, the fuel in the auxiliary oil tank is sucked out by the circulation pump and then passes through the fuel temperature control system for heat exchange and returns to the auxiliary oil tank. That is, at this time, the fuel in the auxiliary oil tank is constantly circulating and exchanging heat. When the next test is conducted, the flow rate can be readjusted through the outlet flow control system. Regarding temperature, since the fuel in the auxiliary tank has already been preheated during the previous test, there is no need to wait for the fuel temperature control system to reheat the fuel in the pipeline. Instead, the discharge control valve can be opened to discharge the fuel from the main tank. The oil circuit switch valves on the main refueling line and the oil discharge line connected to the auxiliary tank can then be directly opened. The oil circuit switch valve on the auxiliary return line can be closed. The preheated fuel can then be refueled into the main tank through the main refueling line using a circulating pump. The test process can then be continued. This centrifugal pump performance test bench shortens the waiting period for fuel heat exchange between the previous and subsequent tests, solving the problem of low test efficiency in existing test benches.

[0009] Furthermore, an oil receiving box is provided on the main oil tank at the bottom of the centrifugal pump, and the oil receiving box is connected to the residual oil tank through a pipeline; the residual oil tank is connected to the fuel temperature control system through a residual oil recovery pipeline, and the residual oil recovery pipeline is provided with a residual oil filter, a residual oil recovery pump and a residual oil switch valve electrically connected to the electrical control system.

[0010] Furthermore, the residual oil switch valve is arranged between the fuel temperature control system and the residual oil recovery pump, and a residual oil recovery valve is provided on the residual oil recovery pipeline between the residual oil switch valve and the residual oil recovery pump, and the residual oil recovery valve is electrically connected to the electrical control system; the discharge pipeline is arranged between the residual oil switch valve and the residual oil recovery valve and is connected to the residual oil recovery pipeline.

[0011] Furthermore, the fuel temperature control system includes a cooling system and an indirect heating system; the cooling system includes a first heat exchanger, a cold source connected to the first heat exchanger to form a cooling circuit, and a cooling switch valve arranged on the cooling circuit; the indirect heating system includes a second heat exchanger connected to the first heat exchanger, a thermal oil tank connected to the second heat exchanger to form an indirect heating circuit, and a thermal oil pump and heater and an indirect heating switch valve arranged on the indirect heating circuit; the cooling switch valve and the indirect heating switch valve are both electrically connected to the electrical control system.

[0012] Furthermore, the outlet flow control system includes at least three flow meters with different flow measurement ranges, one end of each flow meter is connected to the centrifugal pump, and the other end is connected to the main oil tank through a flow regulating valve and a flow switching valve.

[0013] Furthermore, the centrifugal pump performance test bench also includes an air pressure control system connected to the main oil tank and the auxiliary oil tank respectively, and the air pressure control system is electrically connected to the electrical control system.

[0014] Furthermore, the air pressure control system includes a buffer tank and vacuum pipelines connected to the buffer tank respectively, and a compressed air increasing and decreasing pressure circuit; the buffer tank is connected to the main oil tank and the auxiliary oil tank respectively, and the vacuum pipeline is provided with a vacuum pump, a vacuum valve and a vacuum regulating valve, and the compressed air increasing and decreasing pressure circuit is provided with an intake valve, an intake regulating valve and an exhaust valve.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The centrifugal pump performance test bench of the present invention shortens the waiting period for fuel heat exchange during parameter adjustment during the pre- and post-test processes by connecting the auxiliary oil tank, circulation pump, oil discharge pipeline, auxiliary oil return pipeline, main refueling pipeline and oil circuit switch valve, thereby improving test efficiency.

[0017] 2. The centrifugal pump performance test bench of the present invention assists the main oil tank in oil unloading and oil return by adding a subsidiary oil tank to cooperate with the main oil tank. It can simulate different working conditions more flexibly and complete functions such as conventional performance testing and low oil level oil absorption performance testing of centrifugal pumps, thereby achieving multifunctionality and high efficiency.

[0018] 3. The centrifugal pump performance test bench of the present invention can recover residual oil and utilize the recovered residual oil to participate in the entire oil circuit circulation through the connection arrangement of the docking oil box, residual oil tank, residual oil recovery pipeline, residual oil filter, residual oil recovery pump and residual oil switch valve, thereby saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a hydraulic principle diagram of an embodiment of the present invention;

[0020] Figure 2 It is a structural diagram of an embodiment of the present invention.

[0021] In the figure: 1. Main oil tank; 2. Auxiliary oil tank; 3. Oil discharge pipeline; 4. Circulating pump; 5. Outlet flow control system; 51. Flow meter; 52. Flow regulating valve; 53. Flow on / off valve; 6. Air pressure control system; 61. Buffer tank; 62. Vacuum pump; 63. Vacuum valve; 64. Vacuum regulating valve; 65. Air source triplex; 66. Inlet valve; 67. Inlet regulating valve; 68. Exhaust valve; 7. Fuel temperature control system; 71. First heat exchanger; 72. Cooling on / off valve; 73. Circulating water filter; 74. Direct heating on / off valve; 75. Second heat exchanger; 76. Thermal oil tank ;77. Thermal oil pump;78. Heater;79. Indirect heating switch valve;8. Auxiliary return oil pipeline;9. Main refueling pipeline;10. Electrical control system;11. Discharge pipeline;12. Discharge control valve;13. Oil circuit switch valve;14. Centrifugal pump;15. Inlet pipeline;16. Oil receiving box;17. Residual oil tank;18. Residual oil recovery pipeline;19. Residual oil filter;20. Residual oil recovery pump;21. Residual oil switch valve;22. Residual oil recovery valve;23. Liquid level gauge;24. Temperature sensor;25. Pressure sensor;26. Pressure gauge;27. Manual valve;28. Return oil filter. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings.

[0023] See also Figures 1 to 2 This embodiment provides a centrifugal pump performance test bench. The centrifugal pump performance test bench includes a main oil tank 1, a subsidiary oil tank 2, a circulating pump 4 connected to the main oil tank 1 and the subsidiary oil tank 2 via an oil discharge line 3, an outlet flow control system 5, an air pressure control system 6, a fuel temperature control system 7 connected to the return oil filter 28 of the subsidiary oil tank 2 via an auxiliary return oil line 8 and to the return oil filter 28 of the main oil tank 1 via a main refueling line 9, an electrical control system 10, a discharge line 11 connected to the main oil tank 1, a discharge control valve 12 provided on the discharge line 11, and an oil circuit switching valve 13 provided on the oil discharge line 3, the subsidiary return oil line 8, and the main refueling line 9. A centrifugal pump 14 is installed inside the main oil tank 1 and draws oil from the main oil tank 1 via an inlet line 15.

[0024] The outlet flow control system 5 is connected to the centrifugal pump 14 and the main oil tank 1 respectively, and the outlet flow control system 5 is used to control and regulate the flow of fuel pumped out by the centrifugal pump 14. The air pressure control system 6 is connected to the main oil tank 1 and the auxiliary oil tank 2 respectively, and the air pressure control system 6 is used to increase or decrease the pressure of the fuel and to draw a vacuum. The electrical control system 10 is electrically connected to the outlet flow control system 5, the air pressure control system 6 and the fuel temperature control system 7 respectively; the electrical control system 10 includes an AC variable frequency power supply, a DC power supply, a DC voltage and current regulated power supply, a power cabinet, a control cabinet and an electrical control cabinet, etc.; the electrical control system 10 is used for power supply and control. The circulating pump 4 is connected to the fuel temperature control system 7. The oil circuit switching valve 13 is a solenoid valve, which is electrically connected to the electrical control system 10. Liquid level gauges 23 are provided inside the main oil tank 1 and the auxiliary oil tank 2. Temperature sensors 24, pressure sensors 25 and pressure gauges 26 are provided on the main oil tank 1, the auxiliary oil tank 2 and the oil outlet pipelines of the centrifugal pump 14 for measurement and recording. By setting these sensors, the inlet and outlet oil temperatures and pressures of the centrifugal pump 14 are monitored in real time during the temperature and pressure control process, and the flow rate of the heat exchange medium is controlled by real-time feedback, thereby achieving precise control of temperature and pressure.

[0025] The outlet flow control system 5 includes at least three flow meters 51 with different flow measurement ranges. Each flow meter 51 is connected to the centrifugal pump 14 at one end and to the return oil filter 28 on the main fuel tank 1 at the other end via a flow control valve 52 and a flow switch valve 53. The flow measurement ranges of the three flow meters 51 are 0 L / h to 6000 L / h, 6000 L / h to 16000 L / h, and 16000 L / h to 60000 L / h. Through adjustment of the flow control valves 52, the test bench achieves a fuel flow control range of 0 L / h to 60000 L / h, covering a wide range of flow testing requirements.

[0026] The air pressure control system 6 includes a buffer tank 61 and vacuum lines connected to the buffer tank 61, as well as a compressed air pressure increase and decrease circuit. The buffer tank 61 is connected to the space above the liquid level inside the main oil tank 1 and the auxiliary oil tank 2, respectively, so that the liquid level pressure of the oil tank can be automatically adjusted. The vacuum line is equipped with a vacuum pump 62, a vacuum valve 63, a vacuum regulating valve 64, and an air source triplet 65. The valves therein can all be solenoid valves and electrically connected to the electrical control system 10. A manual valve 27 can also be provided for venting or connection. The vacuum line and its accessories are used for vacuuming to simulate vacuum and negative pressure environments. The compressed air pressure increase and decrease circuit is equipped with an air source triplet 65, an air inlet valve 66, an air inlet regulating valve 67, and an air exhaust valve 68. The valves therein can all be solenoid valves and electrically connected to the electrical control system 10. The compressed air pressure increase and decrease circuit and its accessories are used for pressurization or decompression. By setting up the air pressure control system 6, the test bench achieves continuous adjustment of the fuel pressure from -0.1Mpa to +0.3Mpa, with a control accuracy better than ±1.5%, ensuring the compliance of the system functions and performance.

[0027] The fuel temperature control system 7 includes a cooling system, a direct heating system, and an indirect heating system. The cooling system includes a first heat exchanger 71, a cold source connected to the first heat exchanger 71 to form a cooling circuit, and a cooling on / off valve 72 located in the cooling circuit. The cold source is a cooling water source, and the cooling circuit is also equipped with a circulating water filter 73. The cooling on / off valve 72 is a solenoid valve electrically connected to the electrical control system 10. Temperature control accuracy is primarily adjusted by the cooling circuit. The direct heating system includes a heat source connected to the first heat exchanger 71 to form a direct heating circuit, and a direct heating on / off valve 74 located in the direct heating circuit. The heat source is a steam source. The indirect heating system includes a second heat exchanger 75 connected to the first heat exchanger 71, a thermal oil tank 76 connected to the second heat exchanger 75 to form an indirect heating circuit, a thermal oil pump 77, a heater 78, and an indirect heating on / off valve 79 located in the indirect heating circuit. The indirect heating on / off valve 79 is a solenoid valve electrically connected to the electrical control system 10. The indirect heating system is an independent heating system with rapid temperature rise capabilities. To achieve more precise temperature control, a heating scheme using thermal oil heat exchange is proposed. To meet the system's explosion-proof requirements, heater 78 is not used to directly heat the fuel oil. Instead, heater 78 heats the thermal oil, which then exchanges heat with the fuel oil through a second heat exchanger 75. By configuring the cooling system and indirect heating system, the test bench achieves both rapid temperature rise and cooling capabilities, enabling fuel oil operating temperature control and ensuring a continuously adjustable operating temperature between 15°C and 35°C. Once the temperature stabilizes, the control accuracy requirement of ±2°C is met.

[0028] To recover excess oil and utilize it in the entire oil circulation, an oil receiving box 16 is installed on the main oil tank 1 near the bottom of the centrifugal pump 14. This box 16 is connected to a residual oil tank 17 via a pipeline. The residual oil tank 17 is connected to the fuel temperature control system 7 via a residual oil recovery pipeline 18. This residual oil recovery pipeline 18 is equipped with a residual oil filter 19, a residual oil recovery pump 20, and a residual oil on / off valve 21 electrically connected to the electrical control system 10. The residual oil receiving box 16 and the residual oil tank 17 are used to collect excess medium in the system, maintaining a clean test environment. After the residual oil tank 17 collects some of the residual oil that leaked from the oil receiving box 16, the residual oil on / off valve 21 opens, and the residual oil recovery pump 20 pumps the residual oil to the fuel temperature control system 7, where it is simultaneously pumped back into circulation by the circulating pump 4.

[0029] To facilitate fuel discharge from the main tank 1, the discharge pipe 11 can be directly installed at the bottom of the main tank 1. When fuel needs to be discharged from the main tank 1, the discharge control valve 12 on the discharge pipe 11 can be opened. Alternatively, to facilitate fuel discharge and simplify the piping layout, a residual oil on-off valve 21 can be installed between the fuel temperature control system 7 and the residual oil recovery pump 20. A residual oil recovery valve 22 electrically connected to the electrical control system 10 can be installed on the residual oil recovery pipe 18 and between the residual oil on-off valve 21 and the residual oil recovery pump 20. In this case, the discharge pipe 11 can also be installed between the residual oil on-off valve 21 and the residual oil recovery valve 22 and connected to the residual oil recovery pipe 18. In this case, when only residual oil needs to be discharged, the discharge control valve 12 and the residual oil recovery valve 22 can be opened and the residual oil on-off valve 21 can be closed. At this time, the operating conditions of the main tank 1 and the auxiliary tank 2 and the circulating pump 4 and other piping accessories connected thereto do not affect the operating conditions of the residual oil recovery pump 20 in discharging residual oil, that is, they are isolated by the closed residual oil on-off valve 21. When the oil in the main oil tank 1 and / or the auxiliary oil tank 2 needs to be drained, the oil circuit switching valve 13 on the oil discharge line 3 connected to the main oil tank 1 and / or the oil circuit switching valve 13 on the oil discharge line 3 connected to the auxiliary oil tank 2 is opened, the discharge control valve 12 and the residual oil switching valve 21 are opened, and the residual oil recovery valve 22, the auxiliary oil return line 8, and the oil circuit switching valve 13 on the main refueling line 9 are closed. The discharge control valve 12 can be a manual valve 27 or a solenoid valve.

[0030] The following is a brief description of the routine performance test process:

[0031] S1, open a flow switch valve 53 of the outlet flow control system 5, turn on the power, and start the centrifugal pump 14;

[0032] S2. Adjust the power frequency to 400 Hz and the voltage to 115 / 200 V through the electrical control system 10. Adjust the liquid level pressure in the main oil tank 1 to 0 kPa through the air pressure control system 6. Adjust the flow rate to 12,800 L / h through the flow regulating valve 52 of the outlet flow control system 5. Adjust the medium temperature to T0 through the fuel temperature control system 7. Maintain operation for 15 minutes. After operation stabilizes, record the inlet and outlet pressure difference of the centrifugal pump 14.

[0033] S3. Adjust the flow rate to 11500 L / h, adjust the liquid surface pressure to -54 kPa, adjust the medium temperature to T1, and operate for 5 minutes. After the operation stabilizes, record the inlet and outlet pressure difference of centrifugal pump 14;

[0034] S4. Adjust the flow rate to 10897 L / h, adjust the liquid surface pressure to -70.5 kPa, adjust the medium temperature to T2, and operate for 5 minutes. After the operation stabilizes, record the inlet and outlet pressure difference of centrifugal pump 14;

[0035] S5. Turn off the power and the test ends.

[0036] In the above steps S3 to S4, that is, when the medium temperature is to be adjusted from T1 to T2, during step S3, the discharge control valve 12 is closed, the main refueling pipeline 9 and the oil circuit switching valve 13 on the oil discharge pipeline 3 connected to the main oil tank 1 are closed, and the auxiliary return oil pipeline 8 and the oil circuit switching valve 13 on the oil discharge pipeline 3 connected to the auxiliary oil tank 2 are opened. At this time, the fuel in the auxiliary oil tank 2 is sucked out by the circulation pump 4 and then passes through the fuel temperature control system 7 for heat exchange and returns to the auxiliary oil tank 2. That is, at this time, the fuel in the auxiliary oil tank 2 is continuously circulated and heat exchanged until the heat exchange temperature reaches a temperature greater than or equal to T2. When performing step S4, the flow rate and pressure can be readjusted through the outlet flow control system 5 and the air pressure control system 6 respectively; as for the temperature, since the fuel in the auxiliary oil tank 2 has been pre-heated during step S3, there is no need to spend a long time waiting for the fuel temperature control system 7 to heat the fuel in the pipeline again. The discharge control valve 12 can be opened first to discharge the fuel in the main oil tank 1, and then the main refueling pipeline 9 and the oil circuit switching valve 13 on the oil discharge pipeline 3 connected to the auxiliary oil tank 2 can be directly opened, and the oil circuit switching valve 13 on the auxiliary return oil pipeline 8 can be closed. The fuel that has been pre-heated can be refueled into the main oil tank 1 through the main refueling pipeline 9 by the circulating pump 4, and then the corresponding test process can be carried out.

[0037] The low oil level oil absorption performance test process is briefly described as follows:

[0038] S1, open a flow switch valve 53 of the outlet flow control system 5, turn on the power, and start the centrifugal pump 14;

[0039] S2. Adjust the power frequency to 400 Hz and the voltage to 115 / 200 V through the electrical control system 10, adjust the liquid level pressure in the main oil tank 1 to 0 kPa through the air pressure control system 6, adjust the flow rate to 12,800 L / h through the flow regulating valve 52 of the outlet flow control system 5, and adjust the medium temperature to T0 through the fuel temperature control system 7. Maintain the working time for 5 minutes.

[0040] The first two steps are to keep the centrifugal pump 14 working normally;

[0041] S3. Drain the fuel from the main tank 1 until the oil inlet of the centrifugal pump 14 leaks out of the liquid level. The centrifugal pump 14 continues to work for 2 minutes and then stops working. The fuel discharged from the main tank 1 enters the auxiliary tank 2 for standby use.

[0042] S4. Pump the spare fuel in the auxiliary tank 2 out through the circulating pump 4, and add fuel to the main tank 1 through the main refueling line 9 until the liquid level is 700 mm above the oil inlet of the centrifugal pump 14, or in other words, ensure that the liquid level submerges the inlet of the inlet line 15 by 60 mm. Start the centrifugal pump 14. At this time, the centrifugal pump 14 should be able to start and work normally in less than 15 seconds.

[0043] The test bench can improve testing efficiency by connecting and arranging the auxiliary oil tank 2, the circulating pump 4, the oil discharge line 3, the auxiliary oil return line 8, the main refueling line 9, and the oil circuit switch valve 13. This efficiency improvement is mainly reflected in the following aspects: on the one hand, when parameters need to be adjusted during the previous and subsequent tests, the waiting period for fuel heat exchange during the adjustment is shortened; on the other hand, after the main oil tank 1 is tested, in order to pour out the oil inside or add oil to the tank, there is no need to manually open the tank. Instead, the oil in the main oil tank 1 can be directly stored in the auxiliary oil tank 2 for standby use or the oil can be automatically added to the main oil tank 1 directly through the auxiliary oil tank 2, saving time; thirdly, when a low oil level oil absorption performance test is required after the routine performance test is completed, there is no need to pour out the oil in the main oil tank 1. The oil in the main oil tank 1 can be directly automatically introduced into the auxiliary oil tank 2 for storage through the circulating pump 4 and the oil circuit switch valve 13 on the oil discharge line 3 connected to the main oil tank 1, thereby achieving both multifunctionality and efficiency.

[0044] The embodiments of the present invention are described above in conjunction with the accompanying drawings. The embodiments of the present invention and the features thereof may be combined with each other unless there is any conflict. The present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Under the guidance of the present invention, those skilled in the art may devise various forms without departing from the spirit of the present invention and the scope of protection of the claims. All of these forms fall within the scope of protection of the present invention.

Claims

1. A centrifugal pump performance test bench, comprising a main oil tank (1), an outlet flow control system (5), a fuel temperature control system (7), an electrical control system (10), a discharge pipeline (11) connected to the main oil tank (1), and a discharge control valve (12) provided on the discharge pipeline (11); the main oil tank (1) is connected to a centrifugal pump (14) via an inlet pipeline (15), the outlet flow control system (5) is connected to the centrifugal pump (14) and the main oil tank (1), respectively, and the electrical control system (10) is electrically connected to the outlet flow control system (5) and the fuel temperature control system (7), respectively; and characterized in that: The centrifugal pump performance test bench further comprises a subsidiary oil tank (2) and a circulation pump (4); the main oil tank (1) and the subsidiary oil tank (2) are respectively connected to the circulation pump (4) via an oil discharge pipeline (3); the circulation pump (4) is connected to a fuel temperature control system (7); the fuel temperature control system (7) is respectively connected to the subsidiary oil tank (2) via a subsidiary oil return pipeline (8) and to the main oil tank (1) via a main refueling pipeline (9); and the oil discharge pipeline (3), the subsidiary oil return pipeline (8) and the main refueling pipeline (9) are all provided with an oil circuit switch valve (13) electrically connected to the electrical control system (10).

2. The centrifugal pump performance test bench according to claim 1, characterized in that: An oil receiving box (16) is provided on the main oil tank (1) at the bottom of the centrifugal pump (14), and the oil receiving box (16) is connected to a residual oil tank (17) through a pipeline; the residual oil tank (17) is connected to a fuel temperature control system (7) through a residual oil recovery pipeline (18), and the residual oil recovery pipeline (18) is provided with a residual oil filter (19), a residual oil recovery pump (20), and a residual oil switch valve (21) electrically connected to the electrical control system (10).

3. The centrifugal pump performance test bench according to claim 2, characterized in that: The residual oil switch valve (21) is arranged between the fuel temperature control system (7) and the residual oil recovery pump (20); a residual oil recovery valve (22) is provided on the residual oil recovery pipeline (18) between the residual oil switch valve (21) and the residual oil recovery pump (20); the residual oil recovery valve (22) is electrically connected to the electrical control system (10); and the discharge pipeline (11) is arranged between the residual oil switch valve (21) and the residual oil recovery valve (22) and is in communication with the residual oil recovery pipeline (18).

4. The centrifugal pump performance test bench according to claim 1, characterized in that: The fuel temperature control system (7) includes a cooling system and an indirect heating system; the cooling system includes a first heat exchanger (71), a cold source connected to the first heat exchanger (71) to form a cooling circuit, and a cooling switch valve (72) arranged on the cooling circuit; the indirect heating system includes a second heat exchanger (75) connected to the first heat exchanger (71), a heat transfer oil tank (76) connected to the second heat exchanger (75) to form an indirect heating circuit, and a heat transfer oil pump (77) and a heater (78) and an indirect heating switch valve (79) arranged on the indirect heating circuit; the cooling switch valve (72) and the indirect heating switch valve (79) are both electrically connected to the electrical control system (10).

5. The centrifugal pump performance test bench according to claim 1, characterized in that: The outlet flow control system (5) comprises at least three flow meters (51) with different flow measurement ranges, one end of each flow meter (51) being connected to the centrifugal pump (14) and the other end being connected to the main oil tank (1) via a flow regulating valve (52) and a flow switching valve (53).

6. The centrifugal pump performance test bench according to claim 1, characterized in that: The centrifugal pump performance test bench further comprises an air pressure control system (6) connected to the main oil tank (1) and the auxiliary oil tank (2), respectively, and the air pressure control system (6) is electrically connected to the electrical control system (10).

7. The centrifugal pump performance test bench according to claim 6, characterized in that: The air pressure control system (6) comprises a buffer tank (61), a vacuum pumping pipeline respectively connected to the buffer tank (61), and a compressed air pressure-increasing and decompressing circuit; the buffer tank (61) is respectively connected to the main oil tank (1) and the auxiliary oil tank (2); the vacuum pumping pipeline is provided with a vacuum pump (62), a vacuum pumping valve (63), and a vacuum regulating valve (64); and the compressed air pressure-increasing and decompressing circuit is provided with an air intake valve (66), an air intake regulating valve (67), and an air exhaust valve (68).

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