An aircraft engine lubricating oil system capable of long-term inverted flight

Abstract

The present application provides an aircraft engine lubricating oil system capable of long-term inverted flight, comprising: a plurality of lubricating oil chambers, each lubricating oil chamber having a ventilation path above and an oil return path below, the oil supply path extending from the upper part of the lubricating oil chamber into each lubricating oil chamber; a lubricating oil pump connected to the oil supply path, and a radiator and a lubricating oil filter connected in series on the oil supply path, a conversion valve is provided at the intersection of the ventilation path and the oil return path of each lubricating oil chamber, and the conversion valve is connected to the lubricating oil pump; a ventilator connected to the conversion valve of each lubricating oil chamber to form a ventilation path, the ventilation path is connected to the lubricating oil tank and partially extends into the lubricating oil tank to form an oil tank inverted flight ventilation pipe; the lubricating oil tank has an oil suction port and an oil return port, the oil suction port is connected to the lubricating oil pump through the total oil suction path, the oil return port is connected to the lubricating oil pump through the total oil return path, the total oil suction path and the total oil return path intersect and a conversion valve is provided at the intersection. The lubricating oil system of the present application forms a system capable of forward and reverse circulation, thereby realizing long-term inverted flight of the aircraft.

Description

Technical Field

[0001] The present application belongs to the field of aircraft engine technology, and in particular relates to an aircraft engine lubricating oil system capable of long-term inverted flight. Background Art

[0002] Inverted flight refers to a flight action in which the aircraft's belly is facing upward and its back is facing downward. Traditional aircraft cannot fly inverted continuously, and the inverted flight time can only last for 30 seconds at most. After that, the engine oil system cannot continue to circulate, the oil system cannot work, and cannot meet the lubrication and cooling needs of the transmission system.

[0003] As the inverted flight time requirement of aircraft increases, an aircraft engine lubricating oil system that can continuously meet the inverted flight requirements of the aircraft is needed. Summary of the invention

[0004] The purpose of the present application is to provide an aircraft engine lubricating oil system capable of long-term inverted flight, characterized in that it solves or alleviates at least one problem in the background technology.

[0005] The technical solution of the present application is: an aircraft engine lubricating oil system capable of long-term inverted flight, the lubricating oil system comprising:

[0006] A plurality of lubricating oil chambers, each of which has a ventilation passage above and an oil return passage below, and an oil supply passage extending from the upper portion of the lubricating oil chamber into each lubricating oil chamber;

[0007] A lubricating oil pump is connected to the oil supply line, and a radiator and a lubricating oil filter are connected in series on the oil supply line. A conversion valve is provided at the intersection of the ventilation path and the oil return path of each lubricating oil chamber, and is connected to the lubricating oil pump through the conversion valve;

[0008] A ventilator connected to the conversion valve of each lubricating oil chamber to form a ventilation path, wherein the ventilation path is connected to the lubricating oil tank and partially extends into the lubricating oil tank to form an oil tank inverted flight ventilation pipe;

[0009] The lubricating oil tank has an oil suction port and an oil return port. The oil suction port is connected to the lubricating oil pump through a total oil suction line, and the oil return port is connected to the lubricating oil pump through a total oil return line. The total oil suction line and the total oil return line intersect and a conversion valve is provided at the intersection.

[0010] Furthermore, the length of the oil supply passage extending into the oil cavity is such that when the aircraft flies inverted, the oil in the oil cavity will not return from the oil supply passage.

[0011] Furthermore, the oil suction port and the oil return port of the lubricating oil tank are respectively close to the upper end and the lower end of the lubricating oil tank, so that oil can be supplied from the oil suction port during forward flight and from the oil return port during inverted flight.

[0012] Furthermore, the oil tank inverted flight ventilation pipe extends into the oil tank to such a length that when the aircraft flies inverted, the oil in the oil tank will not return through the oil tank inverted flight ventilation pipe.

[0013] Furthermore, during forward flight, the conversion valve at the bottom of each lubricating oil chamber connects the ventilation path leading out from the top of each lubricating oil chamber with the ventilator, and connects the return oil path below each lubricating oil chamber with the lubricating oil pump.

[0014] Furthermore, during inverted flight, the conversion valve at the bottom of each lubricating oil chamber connects the ventilation path leading out from the top of each lubricating oil chamber with the lubricating oil pump, and connects the return oil path below each lubricating oil chamber with the ventilator.

[0015] Furthermore, during forward flight, the conversion valve where the main oil suction circuit and the main oil return circuit meet causes the lubricating oil pump to suck oil from the oil suction port of the lubricating oil tank and return oil from the oil return port.

[0016] Furthermore, during reverse flight, the conversion valve where the total oil suction circuit and the total oil return circuit meet causes the lubricating oil pump to suck oil from the oil return port of the lubricating oil tank and return oil from the oil suction port.

[0017] The aircraft engine lubricating oil system provided by the present application utilizes the layout of the lubricating oil return path and the ventilation path in the lubricating oil chamber just below and above the lubricating oil chamber, reasonably connects them, and changes the flow direction by controlling the conversion valve to achieve back and forth switching of the ventilation path and the oil return path, so that the lubricating oil system forms a system that can circulate forward and reverse, thereby realizing long-term inverted flight of the aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0019] Figure 1 This is a schematic diagram of the aircraft engine oil system (in flight) of the present application.

[0020] Figure 2 This is a schematic diagram of the aircraft engine oil system (inverted flight) of the present application. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0022] like Figure 1 As shown, the aircraft engine lubricating oil system capable of long-term inverted flight provided by the present application includes: three lubricating oil chambers - the first lubricating oil chamber 11 to the third lubricating oil chamber 13, a lubricating oil pump 2, a ventilator 3, a radiator 4, a lubricating oil filter 5, a lubricating oil tank 6 and the first conversion valve 71 to the fourth conversion valve 74.

[0023] The top 11A of the first lubricating oil chamber 11, the second lubricating oil chamber 12, and the third lubricating oil chamber 13 is provided with an oil supply passage ( Figure 1 The first lubricating oil chamber 11, the second lubricating oil chamber 12 and the third lubricating oil chamber 13 are supplied with oil through the oil supply passage, which is connected to the oil supply end of the lubricating oil pump 2. The radiator 4 and the lubricating oil filter 5 are connected in series in the oil supply passage from the lubricating oil pump 2 to the top of the first lubricating oil chamber 11 to the top of the third lubricating oil chamber 13. Among them, the oil supply passage part arranged at the top of the first lubricating oil chamber 11, the second lubricating oil chamber 12 and the third lubricating oil chamber 13 extends into each lubricating oil chamber to prevent oil return during reverse flight.

[0024] In addition, a ventilation path is provided directly above the first lubricating oil chamber 11 to the third lubricating oil chamber 13. Figure 1 The first oil chamber 11 is connected to the end of the ventilation path with a first conversion valve 71, which is connected to the bottom 11B of the first oil chamber 11 and the oil pump 2 through the first conversion valve 71 to form an oil return path of the first oil chamber 11 ( Figure 1 The end of the ventilation path of the second lubricating oil chamber 12 is connected to a second conversion valve 72, which is connected to the bottom 12B of the second lubricating oil chamber 12 and the lubricating oil pump 2 to form an oil return path of the second lubricating oil chamber 12 ( Figure 1 The end of the ventilation path of the third lubricating oil chamber 13 is connected to a third conversion valve 73, which is connected to the bottom 13B of the lubricating oil chamber 13 and the lubricating oil pump 2 to form an oil return path of the third lubricating oil chamber 13 ( Figure 1 middle single dotted line).

[0025] The first switching valve 71 to the third switching valve 73 converge to form a ventilation path ( Figure 1 The middle double realization) connects the top of the ventilator 3 and the oil box 6, and partially extends into the oil box 6 to form an oil box reverse flight ventilation pipe. Through the ventilator 3, the first oil chamber 11 to the third oil chamber 13 can be ventilated.

[0026] The lubricating oil pump 2 is respectively connected to the main oil return line ( Figure 1 The double-dotted line) and the total oil suction line ( Figure 1 The main oil return line (in the middle thick solid line) is connected to the oil return port 61 and the oil suction port 62 of the oil tank 6, and the oil return port 61 and the oil suction port 62 are respectively close to the top and the bottom of the oil tank 6. The fourth conversion valve 74 is set at the intersection of the main oil return line and the main oil suction line.

[0027] In the present application, by setting the oil return port 61 and the oil suction port 62 near the upper side and the lower side of the oil tank 6, and setting the fourth conversion valve 74 at the intersection of the total oil return circuit and the total oil suction circuit, the conversion of the fourth conversion valve 74 is controlled to control the aircraft to switch back and forth between the forward flight mode and the inverted flight mode, so that the oil tank 6 has the inverted flight function.

[0028] like Figure 1The working principle diagram of the lubricating oil system during forward flight is shown. When the aircraft is flying forward, the lubricating oil pump 2 is connected to the oil suction port 62 of the lubricating oil tank 6 through the total oil suction line to suck oil. After the lubricating oil passes through the radiator 4 and the lubricating oil filter 5, the oil supply line is provided to supply oil to the first lubricating oil chamber 11, the second lubricating oil chamber 12 and the third lubricating oil chamber 13. The three ventilation paths just above the first lubricating oil chamber 11, the second lubricating oil chamber 12 and the third lubricating oil chamber 13 are converged through the first conversion valve 71, the second conversion valve 72 and the third conversion valve 73, and then connected to the lubricating oil tank 6 through the ventilation path at the bottom. At the same time, the return oil path at the bottom of each lubricating oil chamber flows back to the lubricating oil pump 2 under the control of the first conversion valve 71, the second conversion valve 72 and the third conversion valve 73. The total return oil path of the lubricating oil pump 2 is connected to the return oil port 61 of the lubricating oil tank 6 under the control of the fourth conversion valve 74. Thus, the oil supply and return of the lubricating oil in the forward flight state, and the oil supply and ventilation of the lubricating oil chamber are completed.

[0029] like Figure 2 The working principle diagram of the oil system during inverted flight is shown. When the aircraft is inverted, the oil tank 6 is in an inverted state, and its oil return port 61 becomes an oil suction port. The oil pump 2 sucks oil from the oil return port 61, and after passing through the radiator 4 and the oil filter 5, it supplies oil to the first oil chamber 11, the second oil chamber 12 and the third oil chamber 13 through the oil supply path. The radiator 4 and the oil filter 5 are in the oil supply path during both forward and inverted flight. During inverted flight, the first oil chamber 11 to the third oil chamber 13 are also inverted, and the original ventilation path at the top becomes an oil return path at this time. After the first conversion valve 71, the second conversion valve 72 and the third conversion valve 73 are controlled, the original oil return path at the bottom of the first oil chamber 11 to the third oil chamber 13 becomes a ventilation path at this time, and the air is exhausted through the ventilator 3 after passing through the first conversion valve 71, the second conversion valve 72 and the third conversion valve 73. The total oil return path of the lubricating oil pump 2 is connected to the oil suction port 62 of the lubricating oil tank 6 after being diverted by the fourth conversion valve 74. Thus, the oil supply and oil return of the sliding oil in the inverted flight state, and the oil supply and ventilation of the lubricating oil cavity are completed.

[0030] The present application cleverly utilizes the layout of the lubricating oil return path and the ventilation path in the lubricating oil chamber just below and above the lubricating oil chamber, rationally connects them, and changes the flow direction by controlling the conversion valve to achieve back and forth switching of the ventilation path and the oil return path, so that the lubricating oil system forms a system that can circulate forward and reverse, thereby realizing long-term inverted flight of the aircraft.

[0031] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An aircraft engine lubricating oil system capable of long-term inverted flight. It is characterized in that The lubricating oil system comprises: A plurality of lubricating oil chambers, each of which has a ventilation passage above and an oil return passage below, and the oil supply passage extends from the upper part of the moving square of the lubricating oil chamber into each lubricating oil chamber; A lubricating oil pump is connected to the oil supply line, and a radiator and a lubricating oil filter are connected in series on the oil supply line. A conversion valve is provided at the intersection of the ventilation path and the oil return path of each lubricating oil chamber, and is connected to the lubricating oil pump through the conversion valve; A ventilator connected to the conversion valve of each lubricating oil chamber to form a ventilation path, wherein the ventilation path is connected to the lubricating oil tank and partially extends into the lubricating oil tank to form an oil tank inverted flight ventilation pipe; The lubricating oil tank has an oil suction port and an oil return port, the oil suction port is connected to the lubricating oil pump through a total oil suction line, the oil return port is connected to the lubricating oil pump through a total oil return line, the total oil suction line and the total oil return line intersect and a conversion valve is provided at the intersection, the oil suction port and the oil return port of the lubricating oil tank are respectively close to the upper end and the lower end of the lubricating oil tank, so that oil can be supplied from the oil suction port during forward flight, and oil can be supplied from the oil return port during inverted flight; During forward flight, the conversion valve at the bottom of each lubricating oil chamber connects the ventilation path from the top of each lubricating oil chamber to the ventilator, and connects the oil return path below each lubricating oil chamber to the lubricating oil pump; During inverted flight, the conversion valve at the bottom of each lubricating oil chamber connects the ventilation path from the top of each lubricating oil chamber to the lubricating oil pump, and connects the oil return path below each lubricating oil chamber to the ventilator; During forward flight, the conversion valve where the main oil suction line and the main oil return line meet allows the lubricating oil pump to suck oil from the oil suction port of the lubricating oil tank and return oil from the oil return port; During reverse flight, the conversion valve where the main oil suction circuit and the main oil return circuit meet causes the lubricating oil pump to suck oil from the oil return port of the lubricating oil tank and return oil from the oil suction port.

2. The aircraft engine lubricating oil system capable of long-term inverted flight as claimed in claim 1, It is characterized in that The length of the oil supply passage extending into the oil cavity is such that when the aircraft flies inverted, the oil in the oil cavity will not return from the oil supply passage.

3. The aircraft engine lubricating oil system capable of long-term inverted flight as claimed in claim 2, It is characterized in that The oil tank reverse flight ventilation pipe extends into the oil tank to such a length that the oil in the oil tank will not return through the oil tank reverse flight ventilation pipe when the aircraft is reversed.

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