A high-precision fuel flow stabilization regulation system

Abstract

The present invention discloses a high-precision fuel flow stabilization regulation system, including a fuel supply system, a fuel return system and a main oil circuit flow regulation system; the fuel supply system includes a fuel storage tank, a fuel pump and a pressure-stabilizing tank connected in sequence; the fuel return system includes a first back pressure valve, the inlet of the first back pressure valve is connected to the inlet of the pressure-stabilizing tank, and the outlet of the back pressure valve is connected to the fuel storage tank; the main oil circuit flow regulation system includes a flow meter, an electric regulating valve and a pressure transmitter connected in sequence, and the inlet of the flow meter is connected to the outlet of the pressure-stabilizing tank. The present invention can realize multi-level fuel flow regulation with different precisions, improve the fuel flow regulation precision, reduce pressure pulsation, ensure the fuel supply precision and stability in the combustion test, and improve the reliability of the combustion test results.

Description

Technical Field

[0001] The invention relates to the field of combustion tests of aviation engine parts, and in particular to a high-precision fuel flow stabilization regulating system. Background Art

[0002] During the development of aircraft engines, the combustion chamber, as a core component of aircraft engines, must complete sufficient combustion tests. In the combustion test, important parameters such as oil-gas ratio, combustion efficiency, ignition boundary, and flameout boundary are all related to the fuel flow rate. Therefore, the fuel flow rate must be accurately controlled to ensure the accuracy of the measured parameters. At present, combustion tests mostly use the oil supply method of oil storage tanks and oil pumps. When the fuel supply flow range is large, the rated fuel supply pressure is high. Under low flow conditions, the fuel supply pressure of the oil pump is reduced, resulting in a decrease in the fuel pressure before the regulating valve, a decrease in the fuel pressure drop of the regulating valve and the front and rear oil circuits, and a decrease in the fuel flow control accuracy, affecting the reliability of the test results. Therefore, it is necessary to improve the existing fuel flow stabilization regulation system. Summary of the invention

[0003] The present invention aims to provide a high-precision fuel flow stabilization regulation system to solve the technical problems of reduced fuel supply accuracy and insufficient fuel supply stability in existing fuel flow stabilization regulation systems when the fuel supply flow range is large.

[0004] To achieve the above purpose, the present invention adopts the following technical solutions:

[0005] A high-precision fuel flow stabilization regulation system comprises an oil supply system, an oil return system and a main oil circuit flow regulation system; the oil supply system comprises an oil storage tank, an oil pump and a pressure-stabilizing tank connected in sequence; the oil return system comprises a first back-pressure valve, the inlet of the first back-pressure valve is connected to the inlet of the pressure-stabilizing tank, and the outlet of the back-pressure valve is connected to the oil storage tank; the main oil circuit flow regulation system comprises a flow meter, an electric regulating valve and a pressure transmitter connected in sequence, and the inlet of the flow meter is connected to the outlet of the pressure-stabilizing tank.

[0006] Furthermore, the oil pump is a diaphragm pump.

[0007] Furthermore, a diaphragm damper and a second back pressure valve are sequentially arranged on the oil outlet pipeline of the oil pump.

[0008] Furthermore, the main oil circuit flow regulation system also includes a two-position three-way valve and a bypass nozzle, the oil inlet of the two-position three-way valve is connected to the oil outlet of the pressure transmitter, and the oil outlet of the two-position three-way valve is connected to the bypass nozzle.

[0009] Furthermore, a first T-type filter is provided between the oil storage tank and the oil pump, and a second T-type filter is provided between the pressure stabilizing tank and the flow meter.

[0010] Furthermore, the main oil circuit flow regulating system also includes a ball valve, which is arranged on the oil inlet pipeline of the main oil circuit regulating system.

[0011] Furthermore, the pressure stabilizing tank includes a stainless steel container and steel balls arranged in the stainless steel container.

[0012] Furthermore, a second safety valve is provided on the pressure stabilizing tank.

[0013] Furthermore, the diameter of the steel ball is 8 mm.

[0014] Furthermore, the oil storage tank is provided with a feed port, an observation port, a spray port, a discharge port and a respirator, and a liquid level meter is installed on the side of the oil storage tank.

[0015] The high-precision fuel flow stabilization regulation system of the present invention includes a fuel supply system, a return oil system and a main oil circuit flow regulation system. The fuel supply system includes a fuel storage tank, a fuel pump and a pressure-stabilizing tank connected in sequence. The fuel storage tank and the fuel pump are used to supply fuel to the fuel flow stabilization regulation system and pressurize the fuel. The pressure-stabilizing tank can eliminate the pressure pulsation caused by the fuel pump. The fuel flow of the system can be adjusted in a large range by adjusting the output value of the fuel pump. The return oil system includes a first back pressure valve, the inlet of the first back pressure valve is connected to the inlet of the pressure-stabilizing tank, and the outlet of the back pressure valve is connected to the fuel storage tank. By adjusting the pressure of the back pressure valve, the oil pressure before the oil inlet pipeline of the main oil circuit flow regulation system can be adjusted, and the fuel flow of the return oil pipeline can be adjusted to achieve fuel flow regulation in a large range. The main oil circuit flow regulation system includes a flow meter, an electric regulating valve and a pressure transmitter connected in sequence. The inlet of the flow meter is connected to the outlet of the pressure-stabilizing tank. By adjusting the opening of the electric regulating valve, high-precision fuel flow regulation in a small range can be achieved. The high-precision fuel flow stabilization regulation system of the present invention realizes multi-level fuel flow regulation with different precisions through the above-mentioned technical means, improves the fuel flow regulation precision, reduces pressure pulsation, ensures the fuel supply precision and stability in the combustion test, and improves the reliability of the combustion test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 This is a schematic structural diagram of a high-precision fuel flow stabilization regulation system according to a preferred embodiment of the present invention;

[0017] Attached Figure 2 It is a structural schematic diagram of the oil supply system and the oil return system of the preferred embodiment of the present invention;

[0018] Attached Figure 3 It is a structural schematic diagram of a main oil circuit flow regulating system of a preferred embodiment of the present invention;

[0019] Attached Figure 4 The fuel flow deviation rate diagram and error diagram of the first embodiment of the present invention;

[0020] Attached Figure 5 This is a fuel flow deviation rate diagram and an error diagram of the second embodiment of the present invention.

[0021] Description of reference numerals:

[0022] 1. Oil supply system, 2. Oil return system, 3. Main oil flow control system, 11. Oil storage tank, 12. Oil pump, 121. First safety valve, 13. Pressure regulating tank, 131. Second safety valve, 14. Diaphragm damper, 15. Second back pressure valve, 16. First T-type filter, 21. First back pressure valve, 31. Flow meter, 32. Electric regulating valve, 33. Pressure transmitter, 34. Ball valve, 35. Second T-type filter DETAILED DESCRIPTION

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0024] like Figure 1 As shown, this embodiment provides a high-precision fuel flow stabilization regulation system, including a fuel supply system 1, a fuel return system 2 and a main fuel line flow regulation system 3, the fuel supply system 1 includes a fuel storage tank 11, a fuel pump 14 and a pressure stabilizing tank 13 connected in sequence, the fuel storage tank 11 and the fuel pump 14 are used to supply fuel and pressurize the fuel, the diaphragm damper 14, the second back pressure valve 15, and the pressure stabilizing tank 13 can eliminate the pressure pulsation caused by the fuel pump 14, and the fuel flow of the system can be adjusted in a wide range by adjusting the output value of the fuel pump 14; the fuel return system 2 includes a first back pressure valve 21, the inlet of the first back pressure valve 21 is connected to the pressure stabilizing tank 1 3, the outlet of the first back pressure valve 21 is connected to the oil storage tank 11. By adjusting the pressure of the first back pressure valve 21, the oil pressure before the oil inlet pipeline of the main oil flow regulation system 3 can be adjusted to a medium range, and the fuel flow of the return oil pipeline can be adjusted to achieve fuel flow regulation within a medium range; the main oil flow regulation system 3 includes a flow meter 31, an electric regulating valve 32 and a pressure transmitter 33 connected in sequence. The inlet of the flow meter 31 is connected to the outlet of the pressure regulating tank 13. By adjusting the valve opening of the electric regulating valve 32, high-precision fuel flow regulation within a small range can be achieved. Through the above technical means, multi-level fuel flow regulation with different precisions can be achieved, the fuel flow regulation precision can be improved, the pressure pulsation can be reduced, the fuel supply precision and stability in the combustion test can be guaranteed, and the reliability of the combustion test results can be improved.

[0025] In an optional embodiment, the oil storage tank 11 is provided with a feed port, an observation port, a spray port, a discharge port and a respirator. The oil storage tank 11 is refueled and returned through the feed port. The provision of the spray port and the respirator can prevent microorganisms and particulate matter in the air from contaminating the fuel and slow down the deterioration of the fuel. A liquid level gauge is installed on the side of the oil storage tank 11, and the remaining fuel inside the oil storage tank 11 can be directly observed. A discharge port is provided at the bottom of the oil storage tank 11 for quickly discharging the remaining fuel in the oil storage tank 11. The oil storage tank 11 is connected to the oil circuit with a clamp.

[0026] Preferably, the oil pump 14 is a diaphragm pump, which is provided with a first safety valve 121, and the oil outlet pipeline of the diaphragm pump is provided with a diaphragm damper 14 and a second back pressure valve 15 in sequence. The diaphragm pump sucks the fuel from the oil storage tank 11 into the pump body and pressurizes it. The pressurized fuel passes through the diaphragm damper 14 and the second back pressure valve 15, which preliminarily reduces the pressure pulsation of the fuel and reduces the fuel pressure at the outlet of the diaphragm pump.

[0027] Preferably, the pressure stabilizing tank 13 includes a stainless steel container and a steel ball disposed in the stainless steel container, and a second safety valve 131 is disposed on the pressure stabilizing tank 13. The pressure stabilizing tank 13 composed of a stainless steel container with a built-in steel ball can further eliminate fuel pressure pulsation and keep the fuel flow rate substantially constant. The second safety valve 131 is disposed on the pressure stabilizing tank 13 to prevent overpressure from damaging the pipeline system due to oil line blockage.

[0028] In another optional embodiment, the flow meter 31 is a mass flow meter, and more preferably a Coriolis mass flow meter. The inlet of the mass flow meter is connected to the outlet of the pressure regulating tank 13, and the outlet of the mass flow meter is connected to the inlet of the electric control valve 32. The mass flow meter is used to measure the fuel flow rate of the oil inlet pipeline of the main oil flow regulation system 3 in real time. The oil outlet of the electric control valve 32 is connected to the pressure transmitter 33, and the pressure transmitter 33 is used to detect the fuel pressure of the oil outlet pipeline of the electric control valve 32, so as to adjust the fuel flow rate in time.

[0029] Optionally, a first T-type filter 16 is provided between the oil storage tank 11 and the oil pump 14, and a second T-type filter 35 is provided between the surge tank 13 and the mass flow meter. The first T-type filter 16 and the second T-type filter 35 are used to filter particulate matter in the fuel to prevent damage to the diaphragm pump and the mass flow meter.

[0030] Optionally, the main oil circuit flow regulating system 3 further includes a ball valve 34 , which is disposed between the pressure stabilizing tank 13 and the second T-type filter 35 .

[0031] In another optional embodiment, the main oil circuit flow regulating system 3 also includes a two-position three-way valve and a bypass nozzle. The outlet of the pressure transmitter 33 is respectively connected to the combustion chamber and the oil inlet of the two-position three-way valve, and the oil outlet of the two-position three-way valve is connected to the bypass nozzle. A two-position three-way valve bypass connected in parallel with the combustion chamber is provided in the main oil circuit flow regulating system 3. The delay in fuel supply and stop caused by the long pipeline can be alleviated by the switching operation of the two-position three-way valve. Specifically, before the test, the bypass nozzle is opened. After the oil supply is turned on, the pipeline pressure in front of the two-position three-way valve bypass gradually increases. When the pipeline pressure is stable, the flow is stable, and then the fuel flow is switched to the combustion chamber through the two-position three-way valve switch, so as to realize the rapid response of fuel supply and stop of the combustion chamber.

[0032] Preferably, the high-precision fuel flow stabilization regulation system of the present invention includes multiple sets of main oil circuit flow regulation systems 3, and the multiple sets of main oil circuit flow regulation systems 3 are connected in parallel.

[0033] The high-precision fuel flow stable regulation system of the present invention can adjust the output of the oil pump 14, the opening of the electric regulating valve 32, and then adjust the fuel flow. The fuel flow regulation will cause excess fuel to be generated between the outlet of the oil pump 14 and the main oil circuit flow regulation system 3. The excess fuel flows back to the oil storage tank 11 through the return oil system 2. The return oil system 2 includes a return oil pipeline and a first back pressure valve 21 arranged on the return oil pipeline. By adjusting the first back pressure valve 21, the fuel pressure in the oil supply oil circuit can be adjusted and the pressure threshold of the return oil can be limited. When the fuel flow in the main oil circuit flow regulation system 3 is adjusted, the fuel flow in the main oil circuit flow regulation system 3 is reduced, the oil supply oil circuit pressure of the main oil circuit flow regulation system 3 is increased, the fuel pressure at the inlet of the first back pressure valve 21 exceeds the set pressure of the first back pressure valve 21, the first back pressure valve 21 channel is opened, and the fuel flows back to the oil storage tank 11. In the experiment, the return oil flow and the upstream pressure of the return oil pipeline can be changed by adjusting the set pressure of the first back pressure valve 21, thereby adjusting the flow and pressure of the oil supply circuit of the main oil circuit flow regulation system 3 within a certain range.

[0034] Embodiment 1

[0035] like Figure 2 As shown, in this embodiment, the diaphragm pump is preferably a diaphragm metering pump, with a rated flow rate of 144L / h and a rated pressure of 3.5MPa. The output flow rate of the diaphragm metering pump can be adjusted by adjusting the operating frequency of its motor and the position of the bypass switch in the piston activity stroke of the diaphragm metering pump. A diaphragm damper 14 and a second back pressure valve 15 are provided on the outlet oil circuit of the diaphragm metering pump. The output pressure of the outlet oil circuit of the diaphragm metering pump can be adjusted by adjusting the pressure of the second back pressure valve 15, and the combined use of the diaphragm damper 14 and the second back pressure valve 15 can preliminarily reduce the pressure pulsation caused by the piston activity of the diaphragm metering pump. In this embodiment, more than 90% of the pressure pulsation can be eliminated.

[0036] The pressure stabilizing tank 13 includes a stainless steel container with a capacity of 5L and a steel ball with a diameter of 8mm built in. The stainless steel container and the steel ball together form a solid damper. When working, the fuel flows in from the lower inlet of the pressure stabilizing tank 13 and flows out from the upper outlet. The pressure stabilizing tank 13 can further eliminate the pressure pulsation caused by the oil pump 14, and cooperates with the diaphragm damper 14 and the second back pressure valve 15 configured on the oil outlet pipeline of the oil pump 14. After testing, the steel ball with a diameter of 8mm is selected, and in combination with the flow stabilization regulation system of the present invention, it can eliminate more than 97% of the pressure pulsation and obtain a stable fuel flow supply. For specific experimental results, please refer to the attached Figure 4 and attached Figure 5 .

[0037] The first T-type filter 16 and the second T-type filter 35 both have a filtration accuracy of 30.

[0038] The flow measurement range of the mass flow meter is 0-150kg / h, and the accuracy level is 0.2.

[0039] The electric regulating valve 32 can achieve 0-0.2m 3 / h flow rate is proportionally adjusted, and the total stroke of the actuator of the electric regulating valve 32 is 16mm. The electric regulating valve 32 can be remotely controlled by the electric actuator, and the opening state of the electric regulating valve 32 can also be remotely read through the feedback signal. Preferably, the electric regulating valve 32 is also provided with a manual adjustment interface, and the opening of the electric regulating valve 32 can be manually adjusted through the manual adjustment interface, and the adjustment accuracy can reach 1%.

[0040] In this embodiment, the high-precision fuel flow stabilization regulation system includes two sets of main oil circuit flow regulation systems 3, and the two sets of main oil circuit flow regulation systems 3 are connected in parallel.

[0041] In order to verify the working stability of the high-precision fuel flow stabilization regulation system of this embodiment under low flow conditions, this embodiment tests the use effect of the system under low flow conditions.

[0042] In this embodiment, the mass flow rate is set to 4g / s, and the fuel supply flow rate of the system is tested in the time period of 1320s-1440s to obtain the fuel flow rate deviation rate diagram and error diagram, as shown in Figure 4 As shown in the figure, S is the oil supply flow rate, and S' is the mass flow rate set by the system. The unit is grams per second.

[0043] Depend on Figure 4 It can be seen that in the high-precision fuel flow stabilization regulation system of this embodiment, the fuel flow deviation rate is between -1.5% and 1%, and the fuel supply flow rate is between 3.94g / s and 4.04g / s.

[0044] Embodiment 2

[0045] In this embodiment, the mass flow rate is set to 3g / s, and the fuel supply flow rate of the system is tested in the time period of 1040s-1160s to obtain the fuel flow rate deviation rate diagram and error diagram, as shown in Figure 5 As shown in the figure, S is the oil supply flow rate, and S' is the mass flow rate set by the system. The unit is grams per second.

[0046] The other configurations of this embodiment are the same as those of the first embodiment.

[0047] Depend on Figure 5 It can be seen that in the high-precision fuel flow stabilization regulation system of this embodiment, the fuel flow deviation rate is between -1% and 1.5%, and the fuel supply flow rate is between 2.97g / s and 3.04g / s.

[0048] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A high-precision fuel flow stabilization regulation system, characterized in that: It comprises an oil supply system (1), an oil return system (2) and a main oil circuit flow regulating system (3); The oil supply system (1) comprises an oil storage tank (11), an oil pump (12) and a pressure-surge tank (13) which are connected in sequence; The oil return system (2) comprises a first back pressure valve (21), the inlet of the first back pressure valve (21) is connected to the inlet of the pressure stabilizing tank (13), and the outlet of the back pressure valve is connected to the oil storage tank (11); The main oil circuit flow regulating system (3) comprises a flow meter (31), an electric regulating valve (32) and a pressure transmitter (33) which are connected in sequence, the inlet of the flow meter (31) is connected to the outlet of a pressure regulating tank (13), and the pressure regulating tank (13) comprises a stainless steel container and a steel ball arranged in the stainless steel container.

2. The high-precision fuel flow stabilization regulation system according to claim 1, characterized in that: The oil pump (12) is a diaphragm pump.

3. The high-precision fuel flow stabilization regulation system according to claim 2, characterized in that: A diaphragm damper (14) and a second back pressure valve (15) are sequentially arranged on the oil outlet pipeline of the oil pump (12).

4. The high-precision fuel flow stabilization regulation system according to any one of claims 1 to 3, characterized in that: The main oil circuit flow regulating system (3) further comprises a two-position three-way valve and a bypass nozzle, wherein the oil inlet of the two-position three-way valve is connected to the oil outlet of the pressure transmitter (33), and the oil outlet of the two-position three-way valve is connected to the bypass nozzle.

5. The high-precision fuel flow stabilization regulation system according to claim 4, characterized in that: A first T-type filter (16) is provided between the oil storage tank (11) and the oil pump (12), and a second T-type filter (35) is provided between the pressure stabilizing tank (13) and the flow meter (31).

6. The high-precision fuel flow stabilization regulation system according to claim 4, characterized in that: The main oil circuit flow rate regulating system (3) further comprises a ball valve (34), wherein the ball valve (34) is arranged on the oil inlet pipeline of the main oil circuit flow rate regulating system.

7. The high-precision fuel flow stabilization regulation system according to claim 1, characterized in that: The pressure stabilizing tank (13) is provided with a second safety valve (131).

8. The high-precision fuel flow stabilization regulation system according to claim 7, characterized in that: The diameter of the steel ball is 8 mm.

9. The high-precision fuel flow stabilization regulation system according to claim 4, characterized in that: The oil storage tank (11) is provided with a feed port, an observation port, a spray port, a discharge port and a respirator, and a liquid level meter is installed on the side of the oil storage tank (11).

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