Oil seal system suitable for various aero-engines and control method

Abstract

The invention provides an oil seal system suitable for multiple types of aero-engines and a control method.The oil seal system comprises an oil tank, the oil tank is connected with a three-position four-way reversing valve through an oil suction filter, a system ball valve, a motor pump set, a first one-way valve, a first-stage oil filter, a second-stage oil filter and a flowmeter, and the three-position four-way reversing valve is connected with a second one-way valve and a first two-position two-way electromagnetic valve at the same time; the second one-way valve and the first two-position two-way electromagnetic valve are simultaneously connected with a second two-position two-way electromagnetic valve, a third two-position two-way electromagnetic valve, a fourth two-position two-way electromagnetic valve, a fifth two-position two-way electromagnetic valve and a sixth two-position two-way electromagnetic valve respectively; and the nitrogen supply system is used for providing a stable nitrogen source. The oil sealing system can be used for providing lubricating oil meeting the requirements for pressure, flow, temperature, pollution degree and moisture content for an aircraft engine fuel oil system to conduct oil sealing, unsealing, nitrogen charging and oil removing work of all fuel oil subsystems of an engine.

Description

Technical Field

[0001] The invention belongs to the field of aviation support equipment, and in particular relates to an oil seal system and a control method applicable to multiple types of aircraft engines. Background Art

[0002] The engine oil seal system is used to provide lubricating oil that meets the pressure, flow, temperature, contamination and moisture content requirements for the engine fuel system of XX-10 series and XX series aircraft, and to perform oil sealing, unsealing, nitrogen filling and oil removal work on each fuel subsystem of the engine.

[0003] At present, there is no systematic unified standard for the development of engine oil seal systems by various manufacturers, which leads to the strong model-specificity of the products developed by each manufacturer. Although each product can meet the oil seal operation requirements of the adapted aircraft, it cannot be used universally between similar models or even aircraft of the same series. The lack of universal and serialized design makes it difficult to ensure the oil seal operation of multiple aircraft types. Based on the current status and actual use needs of the engine oil seal system used by the troops, this design intends to develop a universal engine oil seal system design suitable for multiple aircraft types. Summary of the invention

[0004] The purpose of the present invention is to provide an oil sealing system suitable for various types of aircraft engines. This oil sealing system can be used to provide lubricating oil that meets the pressure, flow, temperature, contamination and moisture content requirements of the aircraft engine fuel system to perform oil sealing, unsealing, nitrogen filling and oil removal work on various fuel subsystems of the engine. This system uses sensors, flow meters and online detection devices to achieve automatic control, digital display and intelligent detection and alarm of the oil sealing system. It has good versatility and can well meet the oil sealing operations of various types of aircraft.

[0005] In order to achieve the above technical features, the purpose of the present invention is achieved as follows: an oil seal system suitable for multiple types of aircraft engines includes an oil tank, the oil tank is connected to a three-position four-way reversing valve through an oil suction filter, a system ball valve, a motor pump group, a first one-way valve, a first-stage oil filter, a second-stage oil filter, and a flow meter, the three-position four-way reversing valve is simultaneously connected to the second one-way valve and the first two-position two-way solenoid valve, the second one-way valve and the first two-position two-way solenoid valve are simultaneously connected to the second two-position two-way solenoid valve, the third two-position two-way solenoid valve, the fourth two-position two-way solenoid valve, the fifth two-position two-way solenoid valve and the sixth two-position two-way solenoid valve; and also includes a nitrogen supply system for providing a stable nitrogen source.

[0006] Preferably, the oil tank is provided with a liquid level gauge for displaying the liquid level; A liquid level sensor, a vacuum pressure gauge and a temperature sensor are arranged on one side of the top of the oil tank; A second throttle valve and a second air filter are arranged on the other side of the top of the oil tank.

[0007] Preferably, a heater is provided inside the oil tank.

[0008] Preferably, the top of the oil tank is also connected to a vacuum dehydration system, which includes a vacuum pump. The vacuum pump is connected to the top of the oil tank through a cooler, and a drain valve, a first throttle valve and a first air filter are installed on the pipeline between the cooler and the vacuum pump.

[0009] Preferably, a system safety valve is connected to the pipeline between the motor pump group and the first one-way valve, and the oil return pipe of the system safety valve is connected to the oil tank; The pipeline between the secondary oil filter and the flow meter is connected with a two-position three-way electromagnetic reversing valve, and the two-position three-way electromagnetic reversing valve is connected with the oil return pipe through a relief valve.

[0010] Preferably, an air-cooled radiator and an oil online detector are installed on the oil return pipe; A refueling / draining ball valve is installed on the pipeline between the system ball valve and the motor pump group.

[0011] Preferably, a sampling valve and a first pressure sensor are installed on the pipeline between the flow meter and the three-position four-way reversing valve.

[0012] Preferably, a first pressure sensor and an accumulator are installed on the pipeline between the second one-way valve and the second two-position two-way solenoid valve.

[0013] Preferably, the nitrogen supply system includes a high-pressure nitrogen source, which is connected to the second two-position two-way solenoid valve, the third two-position two-way solenoid valve, the fourth two-position two-way solenoid valve, the fifth two-position two-way solenoid valve and the sixth two-position two-way solenoid valve in sequence through a third air filter, a pressure reducing valve, a pressure gauge, a gas safety valve and a third one-way valve.

[0014] Preferably, the control method for the oil seal system of various types of aircraft engines is as follows: The system adopts frequency conversion control and pipeline flow resistance adaptation mode. On the basis of ensuring that the equipment system pipeline diameter meets the maximum oil seal flow capacity on the machine, the frequency conversion motor speed is adjusted to increase the system flow, thereby providing the system with the required oil seal back pressure, and realizing the precise adjustment of the oil seal pressure of each fuel subsystem of the engine; the maximum system pressure in each oil seal mode is limited by the corresponding overflow valve / system safety valve; The specific control process includes: The motor pump group is used as the power source of the system, and adopts the method of variable frequency motor + quantitative pump to provide a stable and reliable pressure source for the system; The two-position three-way solenoid reversing valve is used to switch the overflow valve / system safety valve in different oil sealing modes of cold oil sealing and hot oil sealing, wherein the system safety valve is used to limit the maximum output pressure of the system in the cold oil sealing mode, and the overflow valve is used to limit the maximum output pressure of the system in the hot oil sealing mode; The flow meter is used to detect the oil seal flow output by the system; The three-position four-way reversing valve is used to switch the system self-circulation and oil seal working modes; The accumulator is used to output the oil seal lubricating oil to the onboard system in a pulsed manner, so as to make the cold oil seal more sufficient; The air-cooled radiator is used for cooling the oil after the vacuum dehydration system heats and removes the water from the lubricating oil. The oil online detector is used to detect the solid contamination level and water content of the system lubricating oil online; The nitrogen supply system is used to reduce the standard nitrogen source to a fixed value and provide a stable nitrogen source for the unsealing function.

[0015] The present invention has the following beneficial effects: 1. This oil seal system can be used to provide the aircraft engine fuel system with lubricating oil that meets the requirements of pressure, flow, temperature, contamination and moisture content to perform oil sealing, unsealing, nitrogen filling and oil removal of various fuel subsystems of the engine. This system uses sensors, flow meters and online detection devices to achieve automatic control, digital display and intelligent detection and alarm of the oil seal system. It has good versatility and can well meet the oil seal operations of various aircraft types.

[0016] 2. The liquid level gauge can be used to display the oil height inside the oil tank.

[0017] 3. The vacuum pressure gauge is used to detect the vacuum degree inside the oil tank, and the temperature sensor can be used to detect the temperature inside the oil tank.

[0018] 4. The above-mentioned heater can be used to heat the oil.

[0019] 5. The vacuum dehydration system can be used to remove water from oil.

[0020] 6. The system safety valve can be used to ensure the safety of the system. It is used to limit the maximum output pressure of the system in the cold oil seal mode.

[0021] 7. The above-mentioned overflow valve is used to limit the maximum output pressure of the system in the thermal oil seal mode.

[0022] 8. The above-mentioned accumulator is used to output the oil seal lubricating oil to the onboard system in a pulsed manner, so that the cold oil seal can be more sufficient.

[0023] 9. The nitrogen supply system is used to reduce the pressure of the 15MPa standard nitrogen source to provide a stable nitrogen source for the unsealing function. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1This is a system diagram of the present invention.

[0026] Figure 2 For the present invention Figure 1 System diagram where the motor pump unit is located.

[0027] Figure 3 For the present invention Figure 1 System diagram of the location of the three-position four-way directional valve.

[0028] Figure 4 For the present invention Figure 1 System diagram of where the nitrogen supply system is located.

[0029] In the figure: oil filling / draining ball valve 1, system ball valve 2, oil suction filter 3, liquid level meter 4, liquid level sensor 5, vacuum pressure gauge 6, temperature sensor 7, motor pump group 8, first non-return valve 9, primary oil filter 10, secondary oil filter 11, system safety valve 12, relief valve 13, two-position three-way electromagnetic reversing valve 14, flow meter 15, first pressure sensor 16, three-position four-way reversing valve 17, second non-return valve 18, accumulator 19, second two-position two-way electromagnetic valve 20, third non-return valve 21, gas safety valve 22, pressure gauge 23, pressure reducing valve 24, third gas filter 25, air-cooled radiator 26, sampling valve 27, line detector 28, vacuum pump 29, first gas filter 30, first throttle valve 31, drain valve 32, cooler 33, heater 34, oil tank 35; A first two-position two-way solenoid valve 20.1, a third two-position two-way solenoid valve 20.2, a fourth two-position two-way solenoid valve 20.3, a fifth two-position two-way solenoid valve 20.4 and a sixth two-position two-way solenoid valve 20.5; The second air filter 30.1 and the second throttle valve 31.1. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0031] Embodiment 1: See also Figure 1-4, an oil seal system suitable for various types of aircraft engines, including an oil tank 35, the oil tank 35 is connected to a three-position four-way reversing valve 17 through an oil suction filter 3, a system ball valve 2, a motor pump group 8, a first non-return valve 9, a primary oil filter 10, a secondary oil filter 11, and a flow meter 15, the three-position four-way reversing valve 17 is simultaneously connected to a second non-return valve 18 and a first two-position two-way solenoid valve 20.1, the second non-return valve 18 and the first two-position two-way solenoid valve 20.1 are simultaneously connected to a second two-position two-way solenoid valve 20, a third two-position two-way solenoid valve 20.2, a fourth two-position two-way solenoid valve 20.3, a fifth two-position two-way solenoid valve 20.4, and a sixth two-position two-way solenoid valve 20.5; and also includes a nitrogen supply system for providing a stable nitrogen source. This oil seal system can be used to provide the aircraft engine fuel system with lubricating oil that meets the pressure, flow, temperature, contamination and moisture content requirements to perform oil sealing, unsealing, nitrogen filling and oil removal work on various fuel subsystems of the engine. This system uses sensors, flow meters and online detection devices to achieve automatic control, digital display and intelligent detection and alarm of the oil seal system. It has good versatility and can well meet the oil seal operations of various aircraft types.

[0032] Furthermore, a liquid level gauge 4 for displaying the liquid level is provided on the oil tank 35. The liquid level gauge 4 is used to display the oil height inside the oil tank 35.

[0033] Furthermore, a liquid level sensor 5, a vacuum pressure gauge 6 and a temperature sensor 7 are provided on one side of the top of the oil tank 35. The liquid level sensor 5 can be used to detect the oil height in the oil tank 35. The vacuum pressure gauge 6 can be used to detect the vacuum degree inside the oil tank 35, and the temperature sensor 7 can be used to detect the temperature inside the oil tank 35.

[0034] Furthermore, a second throttle valve 31.1 and a second air filter 30.1 are provided on the other side of the top of the oil tank 35. The second throttle valve 31.1 and the second air filter 30.1 can be used to exhaust the oil tank 35.

[0035] Furthermore, a heater 34 is provided inside the oil tank 35. The heater 34 can be used to heat the oil.

[0036] Furthermore, the top of the oil tank 35 is also connected to a vacuum dehydration system, which includes a vacuum pump 29, which is connected to the top of the oil tank 35 through a cooler 33, and a drain valve 32, a first throttle valve 31 and a first air filter 30 are installed on the pipeline between the cooler 33 and the vacuum pump 29. The vacuum dehydration system can be used to remove water from the oil.

[0037] Furthermore, the pipeline between the motor pump group 8 and the first one-way valve 9 is connected with a system safety valve 12, and the oil return pipe of the system safety valve 12 is connected to the oil tank 35. The system safety valve 12 can be used to ensure the safety of the system and to limit the maximum output pressure of the system in the cold oil seal mode.

[0038] Furthermore, the pipeline between the secondary oil filter 11 and the flow meter 15 is connected with a two-position three-way electromagnetic reversing valve 14, which is connected to the oil return pipe through a relief valve 13. The relief valve 13 is used to limit the maximum output pressure of the system in the thermal oil sealing mode.

[0039] Furthermore, an air-cooled radiator 26 and an oil online detector 28 are installed on the oil return pipe, which are used for online detection of the solid contamination level and water content of the system lubricating oil.

[0040] Furthermore, a refueling / draining ball valve 1 is installed on the pipeline between the system ball valve 2 and the motor pump group 8, which can be used for draining or refueling the oil tank 35.

[0041] Furthermore, a sampling valve 27 and a first pressure sensor 16 are installed on the pipeline between the flow meter 15 and the three-position four-way reversing valve 17. The sampling valve 27 facilitates sampling of the oil.

[0042] Furthermore, a first pressure sensor 16.1 and an accumulator 19 are installed on the pipeline between the second one-way valve 18 and the second two-position two-way solenoid valve 20. The accumulator 19 is used to output the oil seal lubricating oil to the onboard system in a pulsed manner, so that the cold oil seal is more sufficient.

[0043] Further, the nitrogen supply system includes a high-pressure nitrogen source, which is connected to the second two-position two-way solenoid valve 20, the third two-position two-way solenoid valve 20.2, the fourth two-position two-way solenoid valve 20.3, the fifth two-position two-way solenoid valve 20.4 and the sixth two-position two-way solenoid valve 20.5 in sequence through the third air filter 25, the pressure reducing valve 24, the pressure gauge 23, the gas safety valve 22 and the third one-way valve 21. The nitrogen supply system is used to perform a constant value pressure reduction on the 15MPa standard nitrogen source to provide a stable nitrogen source for the unsealing function.

[0044] Embodiment 2: Control method for oil seal system applicable to various types of aircraft engines: The system adopts frequency conversion control and pipeline flow resistance adaptation mode. On the basis of ensuring that the equipment system pipeline diameter meets the maximum oil seal flow capacity on the machine, the frequency conversion motor speed is adjusted to increase the system flow, thereby providing the system with the required oil seal back pressure, and realizing the precise adjustment of the oil seal pressure of each fuel subsystem of the engine; the maximum system pressure in each oil seal mode is limited by the corresponding overflow valve / system safety valve; The specific control process includes: The motor pump group 8 is used as the power source of the system, and adopts the method of variable frequency motor + quantitative pump to provide a stable and reliable pressure source for the system; The two-position three-way electromagnetic reversing valve 14 is used to switch the overflow valve / system safety valve in different oil sealing modes of cold oil sealing and hot oil sealing, wherein the system safety valve 12 is used to limit the maximum output pressure of the system in the cold oil sealing mode, and the overflow valve 13 is used to limit the maximum output pressure of the system in the hot oil sealing mode; The system takes the maximum working pressure of the cold oil seal of 2.7MPa as a reference, and the opening pressure of the system safety valve 12 is approved to be 105~115% of the maximum working pressure of the cold oil seal of 2.7MPa.

[0045] The system uses the maximum working pressure of the thermal oil seal of 0.25MPa as a reference, and the opening pressure of the relief valve 13 is approved to be 105-115% of the maximum working pressure of the thermal oil seal of 0.25MPa.

[0046] The flow meter 15 is used to detect the oil seal flow output by the system; The three-position four-way reversing valve 17 is used to switch the system self-circulation and oil seal working modes; The accumulator 19 is used to output the oil seal lubricating oil to the onboard system in a pulsed manner, so as to make the cold oil seal more sufficient; The air-cooled radiator 26 is used for cooling the oil after the vacuum dehydration system heats and removes the water from the lubricating oil; The oil online detector 28 is used to detect the solid contamination level and water content of the system lubricating oil online; The nitrogen supply system is used to reduce the standard nitrogen source to a fixed value and provide a stable nitrogen source for the unsealing function.

[0047] Embodiment 4: Functional Overview: The universal engine oil seal system is used to provide lubricating oil that meets the pressure, flow, temperature, contamination and moisture content requirements to the fuel system of XX-10 series 5 and XX-31 series 2 engines, and to perform oil sealing, unsealing, nitrogen filling and oil removal work on each fuel subsystem of the engine.

[0048] Embodiment 5: Tactical indicators: (1) The engine oil seal system is used to perform oil sealing and unsealing (nitrogen filling and oil removal) on XX-10 series 5 and XX series 2 engines; (2) The equipment is equipped with corresponding electrical connection cables according to the electrical connection interface characteristics of the XX-10 series 5 type and XX series 2 type engine oil seals; (3) The equipment is equipped with adapters, adapter tubes, replacement interfaces and other components according to the interface characteristics of the oil seal pipelines of the XX-10 series 5 and XX series 2 engines, which can realize the matching use of the connection components and meet the requirements of the oil seal pipelines and interfaces of the two types of engines; (4) Both bodies of the equipment are equipped with two fixed and two universal wheel assemblies, and a traction assembly, so that one person can tow the equipment to move; (5) The equipment system pipeline adopts two connection forms: wire braided rubber hose and stainless steel pipeline. The pipeline joint connection adopts 24° cone with rubber ring ferrule joint, which is convenient for disassembly and assembly and reliable sealing; (6) The system is equipped with a filtration system with a self-circulating oil purification function. The oil solid contamination purification level is not inferior to level 7 specified in GJB420B, which can ensure that the lubricating oil outlet contamination level meets the requirements and prevent pollution inside the engine; (7) It has the functions of oil constant temperature heating and vacuum dehydration, with the dehydration temperature ≤85°C, which can achieve rapid dehydration of lubricating oil, and the dehydration capacity can reach an oil water content of no more than 300ppm; (8) It has the functions of online automatic detection, display and printing of oil solid contamination and water content; (9) It has the function of rapid oil circulation cooling, which can automatically cool the oil temperature to the oil seal temperature range according to the system working mode; (10) It has the functions of monitoring, testing and displaying parameters such as lubricating oil temperature, pressure and flow, and also has the functions of alarming for over-limit of each parameter and control circuit failure; (11) It has energy storage pulse oil sealing function, and the oil sealing is efficient and sufficient; (12) Equipped with lifting and mooring interfaces to facilitate transportation and lifting; (13) The oil seal hose is managed by customized partitions, and the oil seal joints and accessory switches are managed by traceable patterns, which makes management and access easy.

[0049] Embodiment 6: Technical indicators: The performance parameters of general engine oil seal system are shown in Table 1.

[0050] Table 1 Performance parameters of general engine oil seal system .

Claims

1. Applicable to the oil seal system of various aircraft engines, characterized in that: The invention comprises an oil tank (35), wherein the oil tank (35) is connected to a three-position four-way reversing valve (17) via an oil suction filter (3), a system ball valve (2), a motor pump group (8), a first one-way valve (9), a primary oil filter (10), a secondary oil filter (11), and a flow meter (15); the three-position four-way reversing valve (17) is simultaneously connected to a second one-way valve (18) and a first two-position two-way solenoid valve (20.1); the second one-way valve (18) and the first two-position two-way solenoid valve (20.1) are simultaneously connected to a second two-position two-way solenoid valve (20), a third two-position two-way solenoid valve (20.2), a fourth two-position two-way solenoid valve (20.3), a fifth two-position two-way solenoid valve (20.4), and a sixth two-position two-way solenoid valve (20.5); and the invention also comprises a nitrogen supply system for providing a stable nitrogen source.

2. The oil seal system applicable to various types of aircraft engines according to claim 1, characterized in that: The oil tank (35) is provided with a liquid level meter (4) for displaying the liquid level; A liquid level sensor (5), a vacuum pressure gauge (6) and a temperature sensor (7) are provided on one side of the top of the oil tank (35); A second throttle valve (31.1) and a second air filter (30.1) are provided on the other side of the top of the oil tank (35).

3. The oil seal system applicable to various types of aircraft engines according to claim 2, characterized in that: A heater (34) is provided inside the oil tank (35).

4. The oil seal system applicable to various types of aircraft engines according to claim 2, characterized in that: The top of the oil tank (35) is also connected to a vacuum dewatering system, which includes a vacuum pump (29). The vacuum pump (29) is connected to the top of the oil tank (35) through a cooler (33). A drain valve (32), a first throttle valve (31) and a first air filter (30) are installed on the pipeline between the cooler (33) and the vacuum pump (29).

5. The oil seal system applicable to various types of aircraft engines according to claim 1, characterized in that: The pipeline between the motor pump group (8) and the first one-way valve (9) is connected to a system safety valve (12), and the oil return pipe of the system safety valve (12) is connected to the oil tank (35); The pipeline between the secondary oil filter (11) and the flow meter (15) is connected to a two-position three-way electromagnetic reversing valve (14), and the two-position three-way electromagnetic reversing valve (14) is connected to the oil return pipe through a relief valve (13).

6. The oil seal system applicable to various types of aircraft engines according to claim 5, characterized in that: An air-cooled radiator (26) and an oil online detector (28) are installed on the oil return pipe; An oil filling / draining ball valve (1) is installed on the pipeline between the system ball valve (2) and the motor pump unit (8).

7. The oil seal system applicable to various types of aircraft engines according to claim 1, characterized in that: A sampling valve (27) and a first pressure sensor (16) are installed on the pipeline between the flow meter (15) and the three-position four-way reversing valve (17).

8. The oil seal system applicable to various types of aircraft engines according to claim 1, characterized in that: A first pressure sensor (16.1) and an accumulator (19) are installed on the pipeline between the second one-way valve (18) and the second two-position two-way solenoid valve (20).

9. The oil seal system applicable to various types of aircraft engines according to claim 1, characterized in that: The nitrogen supply system comprises a high-pressure nitrogen source, which is connected to a second two-position two-way solenoid valve (20), a third two-position two-way solenoid valve (20.2), a fourth two-position two-way solenoid valve (20.3), a fifth two-position two-way solenoid valve (20.4) and a sixth two-position two-way solenoid valve (20.5) in sequence through a third air filter (25), a pressure reducing valve (24), a pressure gauge (23), a gas safety valve (22) and a third one-way valve (21).

10. The control method of the oil seal system applicable to various types of aircraft engines according to any one of claims 1 to 9, characterized in that: The system adopts frequency conversion control and pipeline flow resistance adaptation mode. On the basis of ensuring that the pipeline diameter of the equipment system meets the maximum oil seal flow capacity on the machine, the frequency conversion motor speed is adjusted to increase the system flow, thereby providing the system with the required oil seal back pressure, thereby realizing the precise adjustment of the oil seal pressure of each fuel subsystem of the engine; The maximum system pressure in each oil seal mode is limited by the corresponding relief valve / system safety valve; The specific control process includes: The motor pump unit (8) is used as the power source of the system, and adopts a variable frequency motor + quantitative pump method to provide a stable and reliable pressure source for the system; The two-position three-way electromagnetic reversing valve (14) is used to switch the overflow valve / system safety valve in different oil sealing modes of cold oil sealing and hot oil sealing, wherein the system safety valve (12) is used to limit the maximum output pressure of the system in the cold oil sealing mode, and the overflow valve (13) is used to limit the maximum output pressure of the system in the hot oil sealing mode; The flow meter (15) is used to detect the oil seal flow output by the system; The three-position four-way reversing valve (17) is used to switch the system self-circulation mode and the oil seal working mode; The accumulator (19) is used to output the oil seal lubricating oil to the onboard system in a pulsed manner, so as to make the cold oil seal more sufficient; The air-cooled radiator (26) is used for cooling the oil after the lubricating oil is heated and dehydrated by the vacuum dehydration system; The oil online detector (28) is used for online detection of the solid contamination level and water content of the system lubricating oil; The nitrogen supply system is used to reduce the standard nitrogen source to a fixed value and provide a stable nitrogen source for the unsealing function.

Images