Fuel oil pressure reducing device

Abstract

The invention discloses a fuel oil pressure reducing device which comprises a fuel oil pressure reducing device for supplying fuel oil to an engine according to the original pressure of an oil depot or supplying the fuel oil to the engine after the fuel oil is subjected to pressure reduction. Fuel oil can be supplied to engines of different models at different pressures through the oil discharging and pressure releasing path, the fuel oil pressure reducing path and the pressure supplying path, and the fuel oil pressure adjusting function needed by tests of the engines of different models is matched.

Description

Technical Field

[0001] The present invention relates to a fuel pressure reducing device, belonging to the technical field of ground tests of aeroengines. Background Art

[0002] When the test bench supplies fuel to the engine, the supplied fuel needs to have a certain pressure and flow rate and maintain a stable supply within a certain pressure range. Different types of engines have different requirements for the fuel inlet pressure. Therefore, the fuel system of the test bench also needs to have a fuel pressure regulating function to match the test requirements of different types of engines. Summary of the Invention

[0003] To solve the above technical problems, the present invention provides a fuel pressure reducing device.

[0004] The present invention is achieved through the following technical solutions.

[0005] A fuel pressure reducing device provided by the present invention includes:

[0006] A fuel pressure reducing device for supplying fuel to the engine with the original pressure of the oil depot or supplying fuel to the engine after fuel pressure reduction.

[0007] Including: an oil discharge and pressure relief path, a fuel pressure reduction path, and a pressure supply path arranged in parallel.

[0008] The fuel pressure reduction path consists of a flowmeter, a manual valve B, an electric switch valve B, and a pressure reducing valve.

[0009] The pressure supply path consists of a flowmeter, a manual valve B, and an electric switch valve A.

[0010] The oil discharge and pressure relief path consists of a flowmeter, a manual valve A, and an electric switch valve C.

[0011] The inlet of the flowmeter is used to communicate with the oil depot, and the outlet of the flowmeter is connected in parallel with a manual valve A and a manual valve B; the outlet of the manual valve A is connected in parallel with a waste oil pipe and an electric switch valve C, and the waste oil pipe is used to communicate with the waste oil tank;

[0012] The outlet of the manual valve B is connected in parallel with an electric switch valve A and an electric switch valve B, the outlet of the electric switch valve B is connected to the pressure reducing valve, and an oil pressure gauge is installed at the outlet of the pressure reducing valve;

[0013] The outlet of the pressure reducing valve is connected to the outlet of the electric switch valve C and then connected in series with a manual valve C;

[0014] The outlet of the manual valve C is connected to the outlet of the electric switch valve A and then connected to the engine fuel supply pipe, and the engine fuel supply pipe is used to supply fuel to different types of engines.

[0015] The beneficial effects of the present invention are as follows: Fuel can supply oil to different models of engines at different pressures through the oil drainage and pressure relief circuit, the fuel pressure reduction circuit, and the pressure supply circuit respectively, matching the fuel pressure adjustment function required for different models of engine tests. Brief Description of the Drawings

[0016] Figure 1 is a distribution schematic diagram of the present invention;

[0017] In the figure: 1 - flow meter; 2 - manual valve A; 3 - manual valve B; 31 - waste oil pipe; 32 - electric switch valve C; 4 - electric switch valve A; 51 - electric switch valve B; 52 - pressure reducing valve; 53 - oil pressure gauge; 6 - manual valve C; 7 - engine fuel supply pipe. Detailed Description of the Invention

[0018] The technical solution of the present invention will be further described below, but the scope of protection is not limited thereto.

[0019] As Figure 1 shown.

[0020] A fuel pressure reduction device of the present application includes:

[0021] A flow meter 1 with an inlet for communicating with an oil depot, and a manual valve A2 and a manual valve B3 are connected in parallel at the outlet of the flow meter 1.

[0022] A waste oil pipe 31 and an electric switch valve C32 are connected in parallel at the outlet of the manual valve A2, and the waste oil pipe 31 is used to communicate with a waste oil tank. When the manual valve A2 is opened and the electric switch valve C32 and the manual valve B3 are closed, the fuel in the oil depot is depressurized to the waste oil tank. The flow meter 1, the manual valve A2, and the electric switch valve C32 form an oil drainage and pressure relief circuit.

[0023] An electric switch valve A4 and an electric switch valve B51 are connected in parallel at the outlet of the manual valve B3, the outlet of the electric switch valve B51 is connected to a pressure reducing valve 52, and an oil pressure gauge 53 is installed at the outlet of the pressure reducing valve 52.

[0024] The outlet of the pressure reducing valve 52 is connected to the outlet of the electric switch valve C32 and then connected in series with a manual valve C6.

[0025] The outlet of the manual valve C6 is connected to the outlet of the electric switch valve A4 and then connected to an engine fuel supply pipe 7, and the engine fuel supply pipe 7 is used to supply oil to different models of engines.

[0026] The flow meter 1, the manual valve B3, the electric switch valve B51, and the pressure reducing valve 52 form a fuel pressure reduction circuit. The flow meter 1, the manual valve B3, and the electric switch valve A4 form a pressure supply circuit.

[0027] The oil drainage and pressure relief circuit, the fuel pressure reduction circuit, and the pressure supply circuit are connected in parallel.

[0028] When supplying fuel to the engine with the fuel at the original pressure of the oil depot, manual valve A2 and electric switch valve B51 are closed, and manual valve B3 and electric switch valve A4 are opened; when the fuel needs to be depressurized before being supplied to the engine, manual valve A2 and electric switch valve A4 are closed, and manual valve B3, electric switch valve B51 and pressure reducing valve 52 are opened; when fuel supply to the engine is not required, manual valve A2 is opened, electric switch valve C32 and manual valve B3 are closed, and the fuel in the oil depot is depressurized to the waste oil tank.

[0029] When supplying fuel to the engine through the fuel pressure reducing circuit, opening electric switch valve C32 can cause the fuel to be discharged to the waste oil tank through the waste oil pipe 31 for pressure relief.

[0030] When this application is in use, the fuel can supply fuel to engines of different models at different pressures through the oil drainage and pressure relief circuit, the fuel pressure reducing circuit and the pressure supply circuit respectively, matching the fuel pressure adjustment function required for tests of engines of different models.

[0031] The pressure reducing valve is an ERPF electric pressure reducing valve. This type of valve has a double-piston balanced structure and has the advantages of high control accuracy and convenient operation. During the selection and review process of the pressure reducing valve, based on an inlet pressure of 0.3 MPa, an outlet pressure of 0.2 MPa, and a maximum fuel supply flow rate of 30 t / h, the selection and calculation were carried out. Through the selection calculation, the theoretical CV value of the pressure reducing valve is 26, and the selected CV value is 28.

[0032] According to the pressure downstream of the pressure reducing valve and the calculation of the pressure reducing flow rate, the maximum supply flow rate of the pressure reducing valve is determined.

[0033] When the pressure difference before and after the pressure reducing valve is less than 0.086, the supply flow rate of the pressure reducing valve will be less than 20 t / h. During the working process of the pressure reducing valve, it is necessary to ensure that the pressure difference before and after the pressure reducing valve ≥ 0.1 MPa. In this state, the supply flow rate of the pressure reducing valve is greater than the maximum supply flow rate required by the test.

[0034] A pressure reducing valve is a pressure regulating valve that makes the outlet pressure (secondary oil circuit pressure) of the valve lower than the inlet pressure (primary oil circuit pressure). Generally, pressure reducing valves are constant pressure type. The valve orifice gap of the pressure reducing valve adjusts itself with the change of the inlet pressure. Therefore, it can automatically ensure that the outlet pressure of the valve is constant. The pressure reducing valve divides the fuel system into oil circuits with different pressures according to different needs. The pressure reducing valve and the electric switch valve are connected in series to ensure that the pressure difference before and after the electric switch valve is constant, and the amount of oil flowing through the valve does not change with the load.

[0035] When the control current of the pressure reducing valve remains unchanged and the working flow rate downstream of the pressure reducing valve < the maximum supply flow rate of the pressure reducing valve, the working pressure downstream of the pressure reducing valve is constant, and the increase and decrease of the working flow rate do not affect the supply pressure downstream of the pressure reducing valve.

[0036] The pressure reducing valve is controlled by a 4 mA - 20 mA current. During the process of gradually increasing the control current of the pressure reducing valve from 4 mA power supply to 20 mA, the downstream pressure of the pressure reducing valve gradually rises from low to high. Since the pressure reducing valve has no leakage port, during the process of reducing the control current of the pressure reducing valve from 20 mA to 4 mA, the downstream pressure of the pressure reducing valve remains unchanged. It is necessary to open the pressure relief electric valve to release the downstream pressure of the pressure reducing valve before adjusting it to the pressure value corresponding to the current current of the pressure reducing valve.

Claims

1. A fuel pressure reducing device, characterized in that: include: A fuel pressure reducing device that supplies fuel to the engine at the original pressure of the fuel tank or after the fuel is reduced in pressure.

2. The fuel pressure reducing device according to claim 1, characterized in that: include: The oil discharge pressure relief circuit, fuel pressure relief circuit and pressure supply circuit are arranged in parallel.

3. The fuel pressure reducing device according to claim 2, characterized in that: The fuel pressure reducing route is composed of a flow meter (1), a manual valve B (3), an electric switch valve B (51), and a pressure reducing valve (52).

4. The fuel pressure reducing device according to claim 2, characterized in that: The pressure supply route is composed of a flow meter (1), a manual valve B (3), and an electric switch valve A (4).

5. The fuel pressure reducing device according to claim 2, characterized in that: The oil discharge and pressure relief route is composed of a flow meter (1), a manual valve A (2), and an electric switch valve C (32).

6. The fuel pressure reducing device according to claim 3, 4 or 5, characterized in that: The inlet of the flow meter (1) is used to communicate with the oil depot, and the outlet of the flow meter (1) is connected in parallel with a manual valve A (2) and a manual valve B (3); the outlet of the manual valve A (2) is connected in parallel with a waste oil pipe (31) and an electric switch valve C (32), and the waste oil pipe (31) is used to communicate with a waste oil tank; The outlet of the manual valve B (3) is connected in parallel to the electric switch valve A (4) and the electric switch valve B (51), the outlet of the electric switch valve B (51) is connected to the pressure reducing valve (52), and the outlet of the pressure reducing valve (52) is installed with an oil pressure gauge (53); The outlet of the pressure reducing valve (52) is connected to the outlet of the electric switch valve C (32) and then connected in series with the manual valve C (6); The outlet of the manual valve C (6) is connected to the outlet of the electric switch valve A (4) and then connected to the engine oil supply pipe (7). The engine oil supply pipe (7) is used to supply oil to engines of different models.

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