A fuel system flow resistance test bench based on PLC control and its test method

Abstract

The present invention discloses a fuel system flow resistance test bench based on PLC control, including a power oil supply pressure stabilization system, a test measurement system and a PLC control system; the power oil supply pressure stabilization system is connected to the test measurement system through an oil pipe, and the power oil supply pressure stabilization system, the test measurement system and the PLC control system are all connected through a data transmission line. The present invention adopts the same basic platform and can complete a wide range of flow resistance tests; it adopts a programmable logic controller, which has high reliability, less maintenance workload and easy automatic control; it adopts a simple and direct design mode that can measure a wide range of ranges, so that the test bench is low in cost and easy to use; it adopts a front and rear pressure difference to calibrate the pressure difference sensor to meet the flow resistance value, and adopts a large range of pressure difference sensors in combination with a small range, so that the range of measurable flow resistance values ​​is very large. The present invention also discloses a test method using the above-mentioned fuel system flow resistance test bench based on PLC control.

Description

Technical Field

[0001] The present invention belongs to the technical field of a fuel system flow resistance test system based on PLC control in aerospace, and in particular relates to a fuel system flow resistance test bench based on PLC control, and also relates to a test method using the flow resistance test bench. Background Art

[0002] At present, in the field of aerospace, especially in combustion injection systems, lubricating oil system parts, etc., flow resistance values ​​are required. With the continuous development of science and technology, there are more and more requirements for flow resistance testing. The flow resistance test method is to measure the pressure loss generated when a certain flow rate and pressure of fuel passes through the oil filter. That is, when the fuel filter passes through the specified flow rate and pressure, the pressure difference before and after the oil filter is detected. Therefore, there are clear requirements for the flow and pressure of the system, and the flow and pressure of the fuel system must be able to be adjusted over a large range.

[0003] Therefore, it is necessary to develop and design a new type of modern high-precision control fuel system flow resistance test bench and its test method based on PLC control that is low in cost, easy to manufacture, convenient to maintain, and quick and easy to use. Summary of the invention

[0004] The object of the present invention is to provide a fuel system flow resistance test bench based on PLC control which has high reliability, is easy to maintain and can measure a large range of flow resistance values.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fuel system flow resistance test bench based on PLC control includes a power oil supply pressure stabilization system, a test measurement system and a PLC control system; the power oil supply pressure stabilization system is connected to the test measurement system through an oil pipe, and the power oil supply pressure stabilization system, the test measurement system and the PLC control system are all connected through a data transmission line; the power oil supply pressure stabilization system includes a fuel tank, on which a first filter, a first pressure gauge, a gear-type oil replenishment pump, a standby pump, a second pressure gauge, a pressure stabilizing tank and a second filter are sequentially connected through an oil supply pipeline; a precision regulating pump is arranged in parallel with the standby pump, and a first stop valve and a first check valve are respectively arranged on the oil supply pipelines on the front and rear sides of the standby pump, and a second stop valve and a second check valve are respectively arranged on the oil supply pipelines on the front and rear sides of the precision regulating pump; the gear-type oil replenishment pump is driven by the oil replenishment pump motor, the standby pump is driven by the standby pump motor, and the precision regulating The pump is driven by a regulating pump motor; a first return pipeline is arranged between the gear-type oil replenishment pump and the standing pump, the first return pipeline is connected to the oil tank, and a third pressure gauge and an oil replenishment overflow valve are arranged on the first return pipeline; a second return pipeline is arranged between the second pressure gauge and the pressure-stabilizing tank, the second return pipeline is connected to the oil tank, and an overflow loading valve is arranged on the second return pipeline; the test measurement system includes an oil inlet pipeline and an oil outlet pipeline, one end of the oil inlet pipeline is provided with a first test installation interface, and the other end is connected to the outlet end of the oil supply pipeline; one end of the oil outlet pipeline is provided with a second test installation interface, and the other end is connected to the oil tank; a large-range differential pressure sensor, a small-range differential pressure sensor and a third stop valve are arranged in parallel between the oil inlet pipeline and the oil outlet pipeline, and a large-range flowmeter and a small-range flowmeter are also arranged in parallel on the oil outlet pipeline, a first electromagnetic reversing valve is arranged in series with the large-range flowmeter, and a second electromagnetic reversing valve is arranged in series with the small-range flowmeter.

[0006] Preferably, a low liquid level detector and a high liquid level detector are respectively arranged on the tank wall of the oil tank, and a temperature regulator and an air filter are also installed on the oil tank.

[0007] Preferably, a tachometer is installed on the precision regulating pump.

[0008] Preferably, the oil inlet pipeline is also provided with a fourth pressure gauge and an oil inlet pipeline pressure differential sensor, and the oil inlet pipeline pressure differential sensor is switched by controlling the first sensor cut-off valve.

[0009] Preferably, the oil outlet pipeline is also provided with an oil outlet pipeline pressure difference sensor and a fifth pressure gauge, and the oil outlet pipeline pressure difference sensor is switched by controlling the second sensor cut-off valve.

[0010] Preferably, a third filter is further provided at the outlet end of the oil outlet pipeline, a third return pipeline is provided on the oil outlet pipeline at the front end of the third filter, the third return pipeline is connected to the oil tank, and an overflow valve is provided on the third return pipeline.

[0011] Preferably, the PLC control system includes a PLC master control system, a pressure-stabilizing oil supply controller, a pressure difference measurement controller and a flow measurement controller which are signal-connected to the PLC master control system.

[0012] Another object of the present invention is to provide a test method using the above-mentioned fuel system flow resistance test bench based on PLC control.

[0013] To achieve the above object, the present invention provides the following technical solution: a test method of a fuel system flow resistance test bench based on PLC control, comprising the following steps:

[0014] a. Install the test piece between the first test installation interface and the second test installation interface, and turn on the PLC master control system and the pressure-stabilizing oil supply controller, the pressure difference measurement controller, and the flow measurement controller;

[0015] b. Turn on the charge pump motor to drive the gear charge pump to work, and the excess fuel flows back to the tank from the charge overflow valve; turn on the regulating pump motor and the standby pump motor to drive the standby pump and the precision regulating pump to work, and the excess fuel flows back to the tank from the overflow loading valve; under the pressure stabilization state of the pressure stabilization tank, ensure that the fuel pressure is stable and the flow rate reaches the first test installation interface accurately to enter the test piece for testing;

[0016] c. Select different measuring ranges according to the piece to be tested, and select a large-range differential pressure sensor and a large-range flow meter, or select a small-range differential pressure sensor and a small-range flow meter, or use precision adjustment together, and obtain the flow resistance test data of the piece to be tested through the control and data collection of the PLC master control system.

[0017] Compared with the prior art, the beneficial effects of the present invention are: first, the same basic platform is used to complete a wide range of flow resistance tests; second, a programmable logic controller (PLC) is used, which has high reliability, strong anti-interference ability, complete functions, less maintenance workload, online programming and easy automatic control; third, a simple and direct design mode that can measure a wide range of range is adopted, so that the test bench is low in cost, easy to manufacture, convenient to maintain, and convenient and quick to use; fourth, the front and rear pressure differentials are used to calibrate the pressure differential sensor to meet the flow resistance value, and a large range of pressure differential sensors with small ranges, electromagnetic reversing valves, and flow meters are used in combination, and a large range of flow resistance values ​​can be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a brief schematic diagram of the structural principle of the test bench of the present invention;

[0019] Figure 2 It is a detailed schematic diagram of the structural principle of the test bench of the present invention;

[0020] In the figure: 1. Power oil supply pressure stabilizing system; 2. Test and measurement system; 3. PLC control system; 4. Fuel tank; 5. Low level detector; 6. High level detector; 7. Temperature regulator; 8. Air filter; 9. First filter; 10. First pressure gauge; 11. Gear type oil supply pump; 12. Oil supply pump motor; 13. Third pressure gauge; 14. Oil supply overflow valve; 15. Second stop valve; 16. Tachometer; 17. Precision regulating pump; 18. Regulating pump motor; 19. Second check valve; 20. First stop valve; 21. Standby pump motor; 22. Standby pump; 23. First check valve; 24. Second pressure gauge; 25. Overflow loading valve; 26. Second filter; 27. Pressure stabilizing tank; 28. , the fourth pressure gauge; 29, the first sensor stop valve; 30, the oil inlet pipeline pressure differential sensor; 31, the first test installation interface; 32, the second test installation interface; 33, the oil inlet end stop valve; 34, the third stop valve; 35, the large-range pressure differential sensor; 36, the small-range pressure differential sensor; 37, the oil outlet end stop valve; 38, the second sensor stop valve; 39, the oil outlet pipeline pressure differential sensor; 40, the fifth pressure gauge; 41, the first electromagnetic reversing valve; 42, the large-range flow meter; 43, the second electromagnetic reversing valve; 44, the small-range flow meter; 45, the third filter; 46, the overflow valve; 47, the pressure-stabilizing oil supply controller; 48, the pressure differential measurement controller; 49, the flow measurement controller; 50, the PLC master control system. DETAILED DESCRIPTION

[0021] A preferred embodiment of the present invention will be described below in conjunction with the accompanying drawings to clearly and completely describe the technical solution in a preferred embodiment of the present invention.

[0022] See also Figure 1 The present invention includes a power oil supply pressure stabilizing system 1, a test measurement system 2 and a PLC control system 3; the power oil supply pressure stabilizing system 1 and the test measurement system 2 are connected through an oil pipe, and the power oil supply pressure stabilizing system 1, the test measurement system 2 and the PLC control system 3 are all connected through a data transmission line.

[0023] See also Figure 2The power oil supply pressure stabilization system 1 includes an oil tank 4, on which a first filter 9, a first pressure gauge 10, a gear-type oil replenishment pump 11, a standby pump 22, a second pressure gauge 24, a pressure stabilizing tank 27 and a second filter 26 are sequentially connected through an oil supply pipeline; a precision regulating pump 17 is arranged in parallel with the standby pump 22, and the oil supply pipelines on the front and rear sides of the standby pump 22 are respectively provided with a first stop valve 20 and a first check valve 23, and the oil supply pipelines on the front and rear sides of the precision regulating pump 17 are respectively provided with a second stop valve 15 and a second check valve 19, and the precision regulating pump 17 is installed There is a tachometer 16; the gear-type oil replenishment pump 11 is driven by the oil replenishment pump motor 12, the standby pump 22 is driven by the standby pump motor 21, and the precision regulating pump 17 is driven by the regulating pump motor 18; a first return pipeline is arranged between the gear-type oil replenishment pump 11 and the standby pump 22, the first return pipeline is connected to the oil tank 4, and a third pressure gauge 13 and an oil replenishment overflow valve 14 are arranged on the first return pipeline; a second return pipeline is arranged between the second pressure gauge 24 and the pressure-stabilizing tank 27, the second return pipeline is connected to the oil tank 4, and an overflow loading valve 25 is arranged on the second return pipeline.

[0024] The gear type oil replenishing pump 11 must be turned on as soon as the machine is turned on. It draws oil from the oil tank 4 and maintains a certain pressure. The standing pump 22 and the precision regulating pump 17 are used in parallel. Generally, as long as the standing pump 22 is turned on, the requirements can be met. If high adjustment accuracy is required, the precision regulating pump needs to be turned on for precise adjustment. That is, the precision regulating pump 17 is not turned on all the time, and is only turned on when high-precision precision adjustment is required.

[0025] The test measurement system 2 includes an oil inlet pipeline and an oil outlet pipeline, one end of the oil inlet pipeline is provided with a first test installation interface 31, and the other end is connected to the outlet end of the oil supply pipeline; one end of the oil outlet pipeline is provided with a second test installation interface 32, and the other end is connected to the oil tank 4; a large-range differential pressure sensor 35, a small-range differential pressure sensor 36 and a third stop valve 34 are arranged in parallel between the oil inlet pipeline and the oil outlet pipeline, and a large-range flowmeter 42 and a small-range flowmeter 44 are also arranged in parallel on the oil outlet pipeline, a first electromagnetic reversing valve 41 is arranged in series with the large-range flowmeter 42, and a second electromagnetic reversing valve 43 is arranged in series with the small-range flowmeter 44. The two ends of the parallel circuit formed by the large-range flowmeter 42 and the small-range flowmeter 44 are also provided with an oil inlet end stop valve 33 and an oil outlet end stop valve 37, respectively.

[0026] In this embodiment, a low-level liquid level detector 5 and a high-level liquid level detector 6 are respectively provided on the tank wall of the oil tank 4 , and a temperature regulator 7 and an air filter 8 are also installed on the oil tank 4 .

[0027] In this embodiment, the oil inlet pipeline is further provided with a fourth pressure gauge 28 and an oil inlet pipeline pressure differential sensor 30, and the oil inlet pipeline pressure differential sensor 30 is controlled to switch through the first sensor cut-off valve 29; the oil outlet pipeline is further provided with an oil outlet pipeline pressure differential sensor 39 and a fifth pressure gauge 40, and the oil outlet pipeline pressure differential sensor 39 is controlled to switch through the second sensor cut-off valve 38. The oil inlet pipeline pressure differential sensor 30 and the oil outlet pipeline pressure differential sensor 39 respectively measure the pressure change of the fuel during the pipeline transmission process.

[0028] In this embodiment, a third filter 45 is further provided at the outlet end of the oil outlet pipeline, a third return pipeline is provided on the oil outlet pipeline at the front end of the third filter 45, the third return pipeline is connected to the fuel tank 4, and a relief valve 46 is provided on the third return pipeline. When too much fuel passes through the third filter 45, the excess fuel flows back to the tank 4 from the relief valve 46.

[0029] In this embodiment, three return pipes are provided, wherein:

[0030] The first reflux is composed of the first filter 9, the gear type oil replenishment pump 11, and the oil replenishment relief valve 14. That is, when the machine is turned on, when the second stop valve 15 and the first stop valve 20 are closed, the unused oil or the excess oil returns to the oil tank 4 from the oil replenishment relief valve 14; the pressure balance of the gear type oil replenishment pump 11 is maintained.

[0031] The second reflux is composed of the first filter 9, the gear type oil replenishment pump 11, the first stop valve 20, the standing pump 22, the first one-way valve 23, the overflow loading valve 25, and the third filter 45. That is, the oil that has not passed through the second filter 26 or the excess oil returns to the oil tank from the overflow loading valve 25 to maintain the pressure balance of the gear type oil replenishment pump 11, the standing pump 22 and the precision regulating pump 17 when needed.

[0032] The third reflux means that the oil continues to pass through the second filter 26, the first test installation interface 31, and then enters the tested product, and then returns to the oil tank through the second test installation interface 32, the first electromagnetic reversing valve 41, and the large-range flowmeter 42, or returns to the oil tank 4 through the second electromagnetic reversing valve 43 and the small-range flowmeter 44. The third filter 45 only has a filtering function. When the pressure of the third filter 45 is too high, it returns to the oil tank through the overflow valve 46. The overflow valve 46 protects the third filter 45.

[0033] In this embodiment, the PLC control system 3 includes a PLC master control system 50, a pressure-stabilized oil supply controller 47, a pressure difference measurement controller 48, and a flow measurement controller 49 connected to the PLC master control system 50. The pressure-stabilized oil supply controller 47 is respectively connected to the replenishment pump motor 12, the third pressure gauge 13, the tachometer 16, the regulating pump motor 18, the standby pump motor 21, and the second pressure gauge 24; the pressure difference measurement controller 48 is respectively connected to the fourth pressure gauge 28, the oil inlet pipeline pressure difference sensor 30, the large-range pressure difference sensor 35, the small-range pressure difference sensor 36, the oil outlet pipeline pressure difference sensor 39, the fifth pressure gauge 40, and the like; the flow measurement controller 49 is respectively connected to the first electromagnetic reversing valve 41, the large-range flow meter 42, the second electromagnetic reversing valve 43, the small-range flow meter 44, and the like.

[0034] The test method of the fuel system flow resistance test bench based on PLC control comprises the following steps:

[0035] a. Install the test piece between the first test installation interface 31 and the second test installation interface 32, and turn on the PLC master control system 50 and the pressure-stabilizing oil supply controller 47, the pressure difference measurement controller 48, and the flow measurement controller 49;

[0036] b. Turn on the oil replenishment pump motor 12 to drive the gear type oil replenishment pump 11 to work, and the excess fuel flows back to the fuel tank 4 from the oil replenishment overflow valve 14; turn on the regulating pump motor 18 and the standing pump motor 21 to drive the standing pump 22 and the precision regulating pump 17 to work, and the excess fuel flows back to the fuel tank 4 from the overflow loading valve 25; under the pressure stabilization state of the pressure stabilizing tank 27, ensure that the fuel oil pressure is stable and the flow rate reaches the first test installation interface 31 accurately to enter the test piece for testing;

[0037] c. Select different measuring ranges according to the piece to be tested, select a large-range differential pressure sensor 35 and a large-range flow meter 42, or select a small-range differential pressure sensor 36 and a small-range flow meter 44, or use precise adjustment together, and obtain the flow resistance test data of the piece to be tested through the control and data collection of the PLC master control system 50.

[0038] In order to meet the test technical standards and requirements, the present invention is based on a programmable logic controller (PLC for short), which has the characteristics of high reliability, strong anti-interference ability, complete functions, less maintenance workload, online programming and easy automatic control, and the test bench has few parameters for testing and control, so the test bench adopts PLC to fully meet the needs of the system. The test bench is based on PLC and touch screen, and an automatic measurement and control system is designed to control and adjust the working state of the test bench. It can complete the automatic test of flow resistance, and can display and print the work of the automatic test part in real time. Because the touch screen is used as the input, output and display device, the operation is simple, convenient and easy to master.

[0039] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fuel system flow resistance test bench based on PLC control, characterized by: The invention comprises a power oil supply pressure stabilizing system (1), a test measurement system (2) and a PLC control system (3); the power oil supply pressure stabilizing system (1) and the test measurement system (2) are connected via an oil pipe, and the power oil supply pressure stabilizing system (1), the test measurement system (2) and the PLC control system (3) are all connected via a data transmission line; The power oil supply pressure stabilization system (1) comprises an oil tank (4), on which a first filter (9), a first pressure gauge (10), a gear-type oil replenishment pump (11), a standby pump (22), a second pressure gauge (24), a pressure stabilization tank (27) and a second filter (26) are sequentially connected through an oil supply pipeline; a precision regulating pump (17) is arranged in parallel with the standby pump (22), and the oil supply pipelines on both sides of the standby pump (22) are respectively provided with a first stop valve (20) and a first non-return valve (23), and the oil supply pipelines on both sides of the standby pump (22) are respectively provided with a second stop valve (15) and a second non-return valve (19); The gear type oil replenishment pump (11) is driven by the oil replenishment pump motor (12), the standby pump (22) is driven by the standby pump motor (21), and the precision regulating pump (17) is driven by the regulating pump motor (18); a first return pipeline is provided between the gear type oil replenishment pump (11) and the standby pump (22), the first return pipeline is connected to the oil tank (4), and a third pressure gauge (13) and an oil replenishment overflow valve (14) are provided on the first return pipeline; a second return pipeline is provided between the second pressure gauge (24) and the pressure stabilizing tank (27), the second return pipeline is connected to the oil tank (4), and an overflow loading valve (25) is provided on the second return pipeline; The test measurement system (2) comprises an oil inlet pipeline and an oil outlet pipeline, wherein a first test installation interface (31) is provided at one end of the oil inlet pipeline, and the other end is communicated with the outlet end of the oil supply pipeline; a second test installation interface (32) is provided at one end of the oil outlet pipeline, and the other end is communicated with the oil tank (4); a large-range differential pressure sensor (35), a small-range differential pressure sensor (36) and a third stop valve (34) are arranged in parallel between the oil inlet pipeline and the oil outlet pipeline, and a large-range flow meter (42) and a small-range flow meter (44) are also arranged in parallel on the oil outlet pipeline, a first electromagnetic reversing valve (41) is arranged in series with the large-range flow meter (42), and a second electromagnetic reversing valve (43) is arranged in series with the small-range flow meter (44); A low-level liquid level detector (5) and a high-level liquid level detector (6) are respectively arranged on the wall of the oil tank (4), and a temperature regulator (7) and an air filter (8) are also installed on the oil tank (4); The PLC control system (3) comprises a PLC master control system (50), a pressure-stabilizing oil supply controller (47), a pressure difference measurement controller (48) and a flow measurement controller (49) which are signal-connected to the PLC master control system (50).

2. The fuel system flow resistance test bench based on PLC control according to claim 1 is characterized in that: The precision regulating pump (17) is provided with a tachometer (16).

3. The fuel system flow resistance test bench based on PLC control according to claim 1 is characterized in that: The oil inlet pipeline is also provided with a fourth pressure gauge (28) and an oil inlet pipeline pressure difference sensor (30), and the oil inlet pipeline pressure difference sensor (30) is controlled to switch via a first sensor stop valve (29).

4. The fuel system flow resistance test bench based on PLC control according to claim 3 is characterized by: The oil outlet pipeline is also provided with an oil outlet pipeline pressure difference sensor (39) and a fifth pressure gauge (40), and the oil outlet pipeline pressure difference sensor (39) is switched on and off via a second sensor stop valve (38).

5. The fuel system flow resistance test bench based on PLC control according to claim 4 is characterized in that: A third filter (45) is also provided at the outlet end of the oil outlet pipeline, a third return pipeline is provided on the oil outlet pipeline at the front end of the third filter (45), the third return pipeline is connected to the oil tank (4), and an overflow valve (46) is provided on the third return pipeline.

6. A test method using the fuel system flow resistance test bench based on PLC control according to any one of claims 1 to 5, characterized in that: The following steps are included: a. Install the test piece between the first test installation interface (31) and the second test installation interface (32), and turn on the PLC master control system (50) and the pressure-stabilizing oil supply controller (47), the pressure difference measurement controller (48), and the flow measurement controller (49); b. Turn on the oil replenishment pump motor (12) to drive the gear type oil replenishment pump (11) to work, and the excess fuel flows back to the oil tank (4) from the oil replenishment overflow valve (14); turn on the regulating pump motor (18) and the standby pump motor (21) to drive the standby pump (22) and the precision regulating pump (17) to work, and the excess fuel flows back to the oil tank (4) from the overflow loading valve (25); under the pressure stabilization state of the pressure stabilization tank (27), ensure that the fuel oil pressure is stable and the flow rate reaches the first test installation interface (31) accurately to enter the test piece for testing; c. Select different measuring ranges according to the test piece, select a large-range differential pressure sensor (35) and a large-range flow meter (42), or select a small-range differential pressure sensor (36) and a small-range flow meter (44), or use both for precise adjustment, and obtain the flow resistance test data of the test piece through the control and data collection of the PLC master control system (50).

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