Lubricating oil tank with high-temperature-resistant heat insulation structure

Abstract

The utility model discloses a lubricating oil tank with a high-temperature-resistant heat insulation structure. An oil tank shell of the lubricating oil tank is wrapped by a heat insulation cover. The lubricating oil tank is mainly composed of a heat shield, an oil tank shell, an oil supply connector, an oil return connector, an oil scale, an oil level sensor, a gravity oil filler cap, an oil drainage connector, an overflow connector and the like. High temperature outside the shell is blocked through the heat insulation cover, so that the situation that lubricating oil in the oil tank is overheated, and heat influences are generated on an engine lubricating system is avoided. Lubricating oil with a certain volume is stored in the oil tank shell and used by an engine lubricating system, through the design of an oil supply and return pipeline of the lubricating oil tank, engine circulating lubricating oil enters the oil tank shell from the oil tank oil return connector and then circulates to the oil supply connector through the interior of the oil tank shell for continuous oil supply, and heat is taken away due to wrapping of the heat insulation cover and the circulating oil supply process. And the temperature of lubricating oil in the oil tank does not exceed the normal working temperature in a high-temperature environment. The engine lubricating oil tank can effectively solve the problem that lubricating oil in the engine lubricating oil tank is overheated in a high-temperature environment.

Description

Technical Field

[0001] This utility model belongs to the technical field of aero-engine lubrication system, and relates to a high-temperature resistant and heat-insulating structure lubricating oil tank. Background Technology

[0002] The temperature of the lubricating oil in the lubrication system of an aircraft engine directly affects the normal and safe operation of the engine. To prevent the lubricating oil in the lubrication system from rapidly overheating and exceeding its normal operating temperature due to high ambient temperatures during oil circulation with the engine, the design of the lubrication transmission system's lubrication tank must consider the impact of its internal lubricating oil temperature on other engine components. During engine operation, lubricating oil primarily serves to lubricate, cool, and clean the engine. During a flight mission, the engine, along with the aircraft, experiences high-temperature conditions. Under these conditions, it is essential to ensure that the engine lubrication system continuously supplies oil at its normal operating temperature. This invention is developed based on this objective need. Summary of the Invention

[0003] The present invention aims to provide a high-temperature resistant and heat-insulating structure for oil tanks, in order to solve the problem that the lubricating oil inside the engine's lubrication system exceeds the normal operating temperature under high-temperature conditions, so as to ensure that the engine's lubrication system continuously and normally supplies oil and keeps the engine in a good operating condition.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A high-temperature resistant and heat-insulating lubricating oil tank, comprising:

[0006] The fuel tank housing is a ring with a central angle of less than 180°. The difference between the outer and inner radial dimensions of the fuel tank housing is less than the axial length and circumferential arc length of the fuel tank housing, making the fuel tank housing have an arc-shaped and flat structure. The axial direction of the fuel tank housing is parallel to the flight direction of the aircraft.

[0007] A heat shield, which covers the outer surface of the fuel tank shell, is mainly composed of an outer skin, heat insulation material, and an inner skin, wherein:

[0008] The inner surface of the inner skin wraps around the outer surface of the fuel tank shell, and the shape of the inner skin is the same as the shape of the outer surface of the fuel tank shell.

[0009] Thermal insulation material is laid on the outer surface of the inner skin;

[0010] The outer skin is wrapped around the insulation material and welded to the inner skin, thereby sealing the insulation material between the outer and inner skins.

[0011] Alternatively, the outer skin is a corrugated skin, which is cross-shaped.

[0012] As one embodiment, an overflow connector, a drain connector, and a return connector are fitted on the circumferential end face of the fuel tank housing, corresponding to the bottom position of the fuel tank housing, wherein:

[0013] The overflow connector is connected to the internal overflow pipe of the fuel tank housing. One end of the internal overflow pipe is open, and the opening corresponds to the normal fuel level position inside the fuel tank housing.

[0014] The drain connector is directly connected to the interior of the oil tank housing;

[0015] The oil return connector is connected to the internal oil return pipeline of the oil tank housing on one hand, and to the oil return pipeline of the engine lubrication system on the other hand.

[0016] As one embodiment, the axial end face of the oil tank housing is equipped with an oil supply connector, a metal end signal device, and a pressure filling valve, wherein:

[0017] The oil supply connector is connected to the internal oil supply pipeline of the oil tank housing, and oil is continuously supplied to the engine lubrication system through the oil supply connector;

[0018] The metal shavings detector is connected to the internal oil return line of the oil tank housing and is used to detect metal shavings in the internal oil return line.

[0019] The pressure filling valve is used to inject pressurized oil into the interior of the oil tank housing.

[0020] As one embodiment, a gravity-fed filler cap, a dipstick, and a fuel level sensor are mounted on the outer circumferential surface of the fuel tank housing, wherein:

[0021] The gravity filler cap is used to fill the fuel tank with fuel by gravity.

[0022] The dipstick is used to read the oil level inside the tank housing;

[0023] The oil level sensor provides real-time feedback on the oil level inside the tank via a capacitive signal.

[0024] Furthermore, the high-temperature resistant and heat-insulating lubricating oil tank also includes a clamp mounting position on the outer surface of the oil tank shell without a heat insulation cover, and the clamp mounting position is set along the circumference of the oil tank shell.

[0025] This invention employs a heat-insulating wrapping structure and a circulating oil supply heat-insulating method to design the lubricating oil tank, ensuring that the lubricating oil tank can adapt to working conditions in high-temperature environments.

[0026] This invention optimizes the position of the oil tank connectors, primarily enabling the oil tank to overflow, fill, drain, and supply oil functions. The overflow connector controls the filling amount; when the filling reaches a specified value, excess oil flows out through the overflow connector. The drain connector is used to drain the oil inside the oil tank during maintenance. The return connector is an important component of the circulating oil system, receiving the oil circulated back from the engine lubrication system and circulating it inside the oil tank. The supply connector provides the engine with the required amount of oil.

[0027] The heat insulation cover and connector in this invention are detachable, making maintenance and installation convenient.

[0028] Compared with existing technologies, this utility model provides a high-temperature resistant, heat-insulating oil tank, addressing both the heat insulation structure design and the internal oil circulation cooling. The heat insulation cover effectively blocks most of the heat conduction into the oil tank, while the circulating oil supply process inside the tank shell removes heat, ultimately ensuring that the oil temperature inside the tank does not exceed the normal operating temperature even in high-temperature environments. This effectively solves the problem of oil overheating in engine oil tanks under high-temperature conditions. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of a high-temperature resistant, heat-insulated lubricating oil tank.

[0030] Figure 2 This is a schematic diagram illustrating the working principle of a high-temperature resistant, heat-insulated lubricating oil tank.

[0031] Figure 3 Schematic diagram of the heat insulation cover structure for a high-temperature resistant and heat-insulating lubricating oil tank;

[0032] In the diagram: 1. Heat shield; 2. Oil tank housing; 3. Overflow connector; 4. Drain connector; 5. Return connector; 6. Oil supply connector; 7. Metal end signal; 8. Pressure filling valve; 9. Gravity filling port cover; 10. Oil dipstick; 11. Oil level sensor. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. Any modifications, substitutions and alterations made based on ordinary technical knowledge and conventional means in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0034] It should be noted that the radial, axial, and circumferential directions mentioned in this embodiment are based on the cylinder. The axial direction refers to the direction of the central axis of the cylinder, the radial direction refers to the diameter direction of the circumference of the cylinder perpendicular to the central axis and centered on the central axis, and the circumferential direction refers to the circumference direction of the cylinder perpendicular to the central axis and centered on the central axis.

[0035] As an example, to meet the high-temperature requirements of engines, the lubricating oil in the oil tank of its lubrication system is generally kept below 200°C, with a filling volume between 11L and 12L. To meet normal operation at an ambient temperature of 300°C and for high-temperature storage, under conditions of an ambient temperature of 300°C and a lubricating oil volume in the oil tank not exceeding 11.5L, high-temperature storage should last at least 60 minutes, and the lubricating oil in the oil tank should not be heated from 60°C to above 200°C.

[0036] Due to the temperature difference between the inside and outside of the oil tank, when the engine is operating at an ambient temperature of 300℃, a conventional oil tank structure would cause the lubricating oil to exceed its normal operating temperature by 200℃ during operation. The high-temperature resistant, heat-insulating oil tank design of this invention uses a heat shield to block the high temperature outside the casing, thus preventing the lubricating oil inside the tank from overheating and causing thermal effects on the engine lubrication system.

[0037] like Figures 1-3 As shown, this utility model discloses a high-temperature resistant and heat-insulating oil tank, comprising an arc-shaped, flat oil tank shell 2 and a heat insulation cover 1 wrapped around the outside of the oil tank shell 2. Wherein, as... Figure 3 As shown, the inner surface of the heat shield 1 is connected to the outer surface of the fuel tank shell 2. The heat shield 1 is similar to a skin structure, specifically divided into an outer skin 12, a heat insulation material 13, and an inner skin 14. All of them adopt a conformal design (here, conformal design means according to the shape of the fuel tank shell 2). The shape of the inner skin 14 is the same as the outer surface shape of the fuel tank shell 2 where the heat shield 1 is covered. The outer skin 12 is covered by the heat insulation material 13 after the inner skin 14 is laid on the outside. The inner skin 14 and the outer skin 12 are connected by spot welding. The heat insulation material 13 serves as a filling layer between the inner skin 14 and the outer skin 12.

[0038] Figure 1 In the middle, there are two grooves on the circumferential surface (outer ring surface) of the fuel tank shell 2, which are of equal length to the circumferential arc length of the fuel tank shell 2. These two grooves are the locations where the heat shield 1 is not covered. These locations are used to install clamps to secure the fuel tank shell 2 to the aircraft. Figure 1 The axial left end face of the fuel tank shell 2 is set in the same direction as the flight path, which helps to increase the heat dissipation area of ​​the fluid (air) during flight in the same direction, that is, it can increase the area of ​​the heat shield 1 and reflect more heat.

[0039] The outer skin 12 of the heat insulation cover 1 is a corrugated skin in a cross shape. The corrugations on the outer skin 12 can increase the strength of the outer skin 12 and at the same time play a certain role in diffuse reflection of heat radiation, thereby improving the heat insulation performance of the lubricating oil box. The inner skin 14 and the outer skin 12 wrap around the heat insulation material 13 and at the same time play a certain role in diffuse reflection of heat radiation, thereby improving the heat insulation performance of the product.

[0040] The fuel tank housing 2 is also equipped with an overflow connector 3, a drain connector 4, a return connector 5, a supply connector 6, a metal end signal device 7, a pressure filling valve 8, a gravity filling port cover 9, a dipstick 10, and a fuel level sensor 11. Figure 1 As shown, the fuel tank housing 2 is an annular body with a central angle of approximately 85°. Figure 1 The front side (the convex side of the arc) of the medium toroid is the outer circumferential surface, and the back side (the concave side of the arc) is the inner circumferential surface. The left and right sides of the toroid in the figure are the left and right axial end faces, respectively, and the upper and lower end faces of the toroid in the figure are the two circumferential end faces.

[0041] Overflow connector 3 is located at the bottom of oil tank housing 2 (corresponding to) Figure 1 The lower circumferential end face of the middle annular body) is connected to the internal overflow pipe of the oil tank housing 2, such as Figure 2 One end of the internal overflow pipe is at the normal oil level. When the oil level is higher than the opening, the lubricating oil flows out along the pipe to the overflow connector 3.

[0042] The drain connector 4 is located at the bottom of the oil tank housing 2 and is directly connected to the inside of the oil tank housing 2. Opening it will drain the lubricating oil inside the oil tank.

[0043] The return oil connector 5 is located at the bottom of the oil tank housing 2 and is connected to the internal return oil pipeline of the oil tank housing 2. The lubricating oil flowing back from the return oil pipeline of the engine lubrication system returns to the oil tank housing 2 through the return oil connector 5, and is supplied to the engine for circulation through the oil supply connector 6.

[0044] The oil supply connector 6 is located on the right side of the oil tank housing 2 and is connected to the internal oil supply pipeline of the oil tank housing 2. Oil is continuously supplied to the engine lubrication system through the oil supply connector 6 and flows back to the oil tank housing 2 through the engine lubrication system return pipeline.

[0045] Metal End Signaler 7( Figure 2 The Xm is located on the right side of the oil tank housing 2 and is connected to the internal oil return pipeline of the oil tank housing 2 to detect metal shavings in the oil return pipeline.

[0046] The pressure filling valve 8 is located on the right side of the oil tank housing 2 and is connected to the oil tank housing 2. It can add lubricating oil into the oil tank housing 2 through an external filling gun.

[0047] The gravity filler cap 9 is located on the upper part of the oil tank housing 2 and is connected to the oil tank housing 2. It can be manually unscrewed to pour lubricating oil into the oil tank housing 2 by gravity.

[0048] The dipstick 10 is located on the upper part of the oil tank housing 2 and is connected to the oil tank housing 2. The internal dipstick 10 has an oil-holding function, and the oil level in the oil tank housing 2 can be read by the scale on the dipstick 10.

[0049] Oil level sensor 11 ( Figure 2 The Lhyw is located on the upper part of the oil tank housing 2 and is connected to the oil tank housing 2. It provides real-time feedback on the internal lubricating oil level of the oil tank housing 2 through a capacitor signal.

[0050] like Figure 1 As shown, the oil tank adopts a design of wrapping the oil tank shell 2 with a heat insulation cover 1. The heat insulation cover 1 blocks the high temperature outside the oil tank shell 2 to avoid the oil inside the oil tank from overheating and causing thermal impact on the engine lubrication system.

[0051] like Figure 2 As shown, the lubricating oil tank mainly consists of a heat shield 1, an oil tank shell 2, an overflow connector 3, a drain connector 4, a return connector 5, a supply connector 6, a metal end signal device 7, a pressure filling valve 8, a gravity filling port cover 9, an oil dipstick 10, and an oil level sensor 11. The oil tank shell 2 stores a certain volume of lubricating oil for the engine lubrication system. Through the design of the oil supply and return pipelines, the engine circulating lubricating oil enters the oil tank shell 2 from the oil tank return connector 5, and then circulates through the oil tank shell 2 to the supply connector 6 for continuous oil supply. Due to the heat shield 1 and the heat removal during the circulation process, the temperature of the lubricating oil in the oil tank can be guaranteed not to exceed the normal operating temperature in high-temperature environments.

[0052] like Figure 3 The heat shield 1 has an outer skin 12 and an inner skin 14, both of which are conformal (following the shape of the fuel tank shell 2). The inner skin 14 has the same shape as the outer surface of the fuel tank shell 2 covering the heat shield 1. The outer skin 12 is covered by heat insulation material 13 after the inner skin 14 is laid on the outside. The inner skin 14 and the outer skin 12 are connected by spot welding. Figure 3 In the diagram, arrow D represents heat generated from the engine combustion chamber and turbine components, while arrow E represents heat conducted to the oil pan. The size of the arrow indicates the amount of heat conducted. Figure 3 Arrows A, B, and C represent the temperature gradient from the outside to the inside of the heat shield 1, gradually decreasing from the high temperature at arrow A to the low temperature at arrow C.

[0053] In this embodiment, the high-temperature resistant insulation structure is a non-integral fuel tank. The heat shield 1 and external joints and components can be maintained and disassembled. The lubricating oil inside the fuel tank is in a dynamic circulation state, unlike traditional fuel tanks which only store fuel and provide insulation. In this embodiment, the high-temperature resistant insulation structure is located in the engine lubrication system compartment, blocking the heat radiated from the engine combustion chamber, and the lubricating oil is in a circulating state.

[0054] Those skilled in the art can make various adjustments to this application based on the actual circumstances. Therefore, this application is not limited to the structure shown in the specific embodiments, but is to be accorded the widest scope consistent with the principles and features set forth in the claims of this application.

Claims

1. A high-temperature resistant, heat-insulating lubricating oil tank, characterized in that, include: The fuel tank housing (2) is a ring with a central angle of less than 180°. The difference between the outer ring radial dimension and the inner ring radial dimension of the fuel tank housing (2) is less than the axial length dimension and the circumferential arc length dimension of the fuel tank housing (2), so that the fuel tank housing (2) has an arc-shaped and flat structure, and the axial direction of the fuel tank housing (2) is parallel to the flight direction of the aircraft. A heat shield (1) is provided, which covers the outer surface of the tank shell (2). The heat shield (1) is mainly composed of an outer skin (12), a heat insulation material (13), and an inner skin (14), wherein: The inner surface of the inner skin (14) wraps around the outer surface of the tank shell (2), and the shape of the inner skin (14) is the same as the shape of the outer surface of the tank shell (2). Thermal insulation material (13) is laid on the outer surface of the inner skin (14); The outer skin (12) is wrapped around the heat insulation material (13) and welded to the inner skin (14), thereby sealing the heat insulation material (13) between the outer skin (12) and the inner skin (14).

2. The high-temperature resistant and heat-insulating lubricating oil tank according to claim 1, characterized in that: The outer skin (12) is a corrugated skin, which is cross-shaped.

3. The high-temperature resistant and heat-insulating lubricating oil tank according to claim 1, characterized in that: An overflow connector (3), a drain connector (4), and a return connector (5) are fitted on the circumferential end face of the oil tank housing (2) and at the position corresponding to the bottom of the oil tank housing (2), wherein: The overflow connector (3) is connected to the internal overflow pipe of the oil tank shell (2), one end of the internal overflow pipe is open, and the opening corresponds to the normal oil level position inside the oil tank shell (2). The drain connector (4) is directly connected to the interior of the oil tank housing (2); The oil return connector (5) is connected to the internal oil return pipeline of the oil tank housing (2) on the one hand, and to the oil return pipeline of the engine lubrication system on the other hand.

4. The high-temperature resistant and heat-insulating lubricating oil tank according to claim 1, characterized in that: The oil tank housing (2) is equipped with an oil supply connector (6), a metal end signal device (7), and a pressure filling valve (8) on its axial end face, wherein: The oil supply connector (6) is connected to the internal oil supply pipeline of the oil tank housing (2), and oil is continuously supplied to the engine lubrication system through the oil supply connector (6); The metal shavings detector (7) is connected to the internal oil return pipeline of the oil tank housing (2) and is used to detect metal shavings in the internal oil return pipeline. The pressure filling valve (8) is used to inject oil into the tank housing (2) under pressure.

5. The high-temperature resistant and heat-insulating lubricating oil tank according to claim 1, characterized in that: The outer circumferential surface of the fuel tank housing (2) is equipped with a gravity filler cap (9), a dipstick (10), and a fuel level sensor (11), wherein: The gravity filling port cap (9) is used to fill the oil tank shell (2) with oil by gravity; The dipstick (10) is used to read the oil level inside the oil tank housing (2); The oil level sensor (11) provides real-time feedback on the oil level inside the oil tank housing (2) via a capacitance signal.

6. The high-temperature resistant and heat-insulating lubricating oil tank according to claim 1, characterized in that: It also includes a band mounting position on the outer surface of the tank housing (2) where the heat insulation cover (1) is not covered, and the band mounting position is set along the circumference of the tank housing (2).

Images