A mixing device for simulating the oil-gas two-phase state of an aero-engine

Abstract

This application belongs to the field of mixing devices, specifically a mixing device for simulating the two-phase state of oil and air in an aero-engine. It includes a first pipe connector, a second pipe connector, a third pipe connector, a mixing cylinder, and a mixing turbulence device. The mixing cylinder has a mixing chamber and three interfaces communicating with the mixing chamber. The mixing cylinder is connected to the first, second, and third pipe connectors, respectively. The third pipe connector is connected to the test piece. The mixing turbulence device is fixed inside the mixing chamber, and the second pipe connector abuts against it. The mixing turbulence device has a pointed conical structure, with the conical direction aligned with the flow direction of the lubricating oil. This simpler structure achieves effective mixing of lubricating oil and air, and also features: compact structure, small footprint; relatively simple structure, low processing cost; and after oil-air mixing, it retains the pressure and flow rate of the oil-air mixture, eliminating the need for an oil supply pump in the test system.

Description

Technical Field

[0001] This application belongs to the field of mixing devices, and specifically relates to a mixing device for simulating the two-phase state of oil and gas in an aero-engine. Background Technology

[0002] The bearing cavities, transmission gearboxes, and other transmission components of aircraft engines operate under conditions characterized by high speed and large ventilation volume. Therefore, after lubricating these components, the lubricating oil in the engine will carry a large amount of air into the engine's lubricating oil return system, forming a mixture of oil and gas in a two-phase state.

[0003] Currently, the commonly used oil-air mixing devices in the lubrication component level testing of aero-engines are shown in [link to relevant documentation]. Figure 1 As shown.

[0004] Liquid lubricating oil is supplied to the oil-air mixing device using a return oil pump, while compressed air is supplied at the same time. Inside the chamber of the oil-air mixing device, the lubricating oil and air mix naturally in the upper part of the chamber, and the resulting mixture is drawn out by the oil supply pump at the bottom and supplied to the test piece for testing.

[0005] Existing oil-gas blending devices have shortcomings in terms of oil-gas mixing effect, simplicity of the testing system, and testing cost, as detailed below: 1) The upper mixing space of the oil-gas blending device is an open space, and some pure lubricating oil does not come into contact with air, resulting in insufficient mixing with air. At the same time, the blended oil-gas mixture settles at the bottom of the device, and the oil and gas separate due to gravity, resulting in insufficient mixing of oil and gas in the test specimens. 2) In order to supply lubricating oil to the test specimen, the system uses a return oil pump and a supply oil pump working together, which increases the complexity of the system and the difficulty of operation; 3) The oil supply pump draws oil and gas mixtures for a long time, which can easily cause cavitation on the rotor inside the pump, increasing the maintenance cost of the test equipment.

[0006] Therefore, how to achieve thorough mixing of test specimens simply and efficiently is a problem that needs to be solved. Summary of the Invention

[0007] The purpose of this application is to provide a mixing device for simulating the two-phase state of oil and gas in aero-engines, so as to solve the problems of complex structure and insufficient oil-gas mixing in existing test pieces.

[0008] The technical solution of this application is: a mixing device for simulating the two-phase state of oil and gas in an aero-engine, comprising a first pipeline joint, a second pipeline joint, a third pipeline joint, a mixing cylinder, and a mixing turbulence device; the mixing cylinder is provided with a mixing chamber, and the mixing cylinder has three interfaces communicating with the mixing chamber. The mixing cylinder is connected to the first pipeline joint, the second pipeline joint, and the third pipeline joint respectively. The first pipeline joint is a lubricating oil inlet, the second pipeline joint is an air inlet, and the third pipeline joint is an oil-gas mixture outlet and is connected to a test piece. The mixing turbulence device is fixed inside the mixing chamber, and the second pipeline joint abuts against the mixing turbulence device; the mixing turbulence device has a pointed cone structure, and the direction of the cone is against the direction of lubricating oil flow; the mixing turbulence device is provided with a vent hole that communicates the interior of the mixing turbulence device with the mixing chamber.

[0009] Preferably, O-rings are provided between the first pipe joint, the second pipe joint, the third pipe joint and the mixing cylinder.

[0010] Preferably, the number of vent holes gradually decreases from the bottom to the top of the cone.

[0011] Preferably, the mixing cylinder has a Y-shaped structure and the main axis of the mixing cylinder is inclined to the main axis of the second pipeline joint, and the included angle between the first pipeline joint and the second pipeline joint is greater than 90°.

[0012] Preferably, the tip of the mixing and turbulence device is located below the axis of the mixing cylinder, and the top of the mixing and turbulence device is open.

[0013] Preferably, the first pipe joint, the second pipe joint, and the third pipe joint are all threadedly connected to the mixing cylinder.

[0014] The mixing device for simulating the two-phase state of oil and air in an aircraft engine, as described in this application, achieves effective mixing of lubricating oil and air with a simpler structure, and also has the following features: Compared to existing devices, the present invention has a compact structure and occupies less space; The structure is relatively simple and the processing cost is low; After the oil and gas are mixed, the pressure and flow rate of the oil and gas mixture are retained, eliminating the need for an oil supply pump in the test system. Attached Figure Description

[0015] To more clearly illustrate the technical solutions provided in this application, the accompanying drawings will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application.

[0016] Figure 1 This is a schematic diagram of the working principle of an oil-gas blending device in the background technology. Figure 2This is an exploded view of the overall structure of this application; Figure 3 This is a cross-sectional view of the overall structure of this application; Figure 4 This is a schematic diagram of the working principle of the oil-gas blending device in this application.

[0017] 1. First pipe joint; 2. Second pipe joint; 3. Third pipe joint; 4. Mixing cylinder; 5. Mixing and turbulence device; 6. O-ring seal. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] A mixing device for simulating the two-phase state of oil and gas in an aero-engine is used to simulate the two-phase conditions of oil and gas in the lubricating oil system of an aero-engine on a component testing apparatus.

[0020] like Figures 2-4 As shown, the system includes a first pipe connector 1, a second pipe connector 2, a third pipe connector 3, a mixing cylinder 4, and a mixing and turbulence device 5. The mixing cylinder 4 has a mixing chamber and three interfaces communicating with it. The mixing cylinder 4 is connected to the first pipe connector 1, the second pipe connector 2, and the third pipe connector 3, respectively. The first pipe connector 1 is the lubricating oil inlet, the second pipe connector 2 is the air inlet, and the third pipe connector 3 is the oil-air mixture outlet and is connected to the test piece. The mixing and turbulence device 5 is fixed inside the mixing chamber, and the second pipe connector 2 abuts against the mixing and turbulence device 5.

[0021] The mixing and turbulence device 5 has a pointed cone structure, with the cone pointing in the opposite direction to the flow of lubricating oil. This structure and layout can reduce the flow resistance of the lubricating oil in the mixing part, thereby eliminating the need for the oil supply pump in the original oil-gas mixing device test system.

[0022] The mixing and turbulence device 5 is provided with a vent hole that connects the interior of the mixing and turbulence device 5 to the mixing chamber, so as to fully mix the air from the second pipeline joint 2 into the lubricating oil to form a uniform oil-gas two-phase mixture.

[0023] The above design allows oil and gas to be more fully mixed in the device and supplied to the test specimen in a timely manner, avoiding the re-separation of oil and gas in the device. At the same time, it eliminates the need to install an oil supply pump after mixing, allowing the mixed mixture to be directly supplied to the test specimen.

[0024] Preferably, in order to improve the sealing performance, O-rings 6 are provided between the first pipe joint 1, the second pipe joint 2, the third pipe joint 3 and the mixing cylinder 4, thereby improving the sealing performance and ensuring sufficient internal cavity pressure.

[0025] Preferably, the number of vent holes gradually decreases from the bottom to the top of the cone. Since the bottom of the mixing and turbulence device 5 is far from the axis of the mixing cylinder 4, this design can ensure that the mixing cylinder 4 can obtain relatively uniform air.

[0026] Preferably, the mixing cylinder 4 has a Y-shaped structure and the main axis of the mixing cylinder 4 is inclined to the main axis of the second pipe joint 2. The included angle between the first pipe joint 1 and the second pipe joint 2 is greater than 90°, so that the incoming air and lubricating oil will generate convection when they come into contact, thereby effectively improving the mixing efficiency.

[0027] Preferably, the tip of the mixing and turbulence device 5 is located below the axis of the mixing cylinder 4, and the top of the mixing and turbulence device 5 is open, thereby ensuring that the mixing cylinder 4 can obtain relatively uniform air at all circumferential positions.

[0028] Preferably, the first pipe joint 1, the second pipe joint 2, and the third pipe joint 3 are all threadedly connected to the mixing cylinder 4, making installation convenient and stable.

[0029] In summary, this application achieves effective mixing of lubricating oil and air with a simpler structure, and also has the following advantages: Compared to existing devices, the present invention has a compact structure and occupies less space; The structure is relatively simple and the processing cost is low; After the oil and gas are mixed, the pressure and flow rate of the oil and gas mixture are retained, eliminating the need for an oil supply pump in the test system.

[0030] Finally, it should be noted that the accompanying drawings of the embodiments disclosed in this invention only involve the structures involved in the embodiments disclosed in this invention. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of this invention can be combined with each other. In conclusion, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A mixing device for simulating the two-phase state of oil and gas in an aircraft engine, characterized in that: The system includes a first pipe connector (1), a second pipe connector (2), a third pipe connector (3), a mixing cylinder (4), and a mixing and turbulence device (5). The mixing cylinder (4) has a mixing chamber and three interfaces that communicate with the mixing chamber. The mixing cylinder (4) is connected to the first pipe connector (1), the second pipe connector (2), and the third pipe connector (3), respectively. The first pipe connector (1) is the lubricating oil inlet, the second pipe connector (2) is the air inlet, and the third pipe connector (3) is the oil-air mixture outlet and is connected to the test piece. The mixing and turbulence device (5) is fixed inside the mixing chamber and the second pipe connector (2) abuts against the mixing and turbulence device (5). The mixing and turbulence device (5) has a pointed cone structure, and the direction of the cone is against the direction of lubricating oil flow. The mixing and turbulence device (5) is provided with a vent hole that communicates the interior of the mixing and turbulence device (5) with the mixing chamber. The mixing cylinder (4) has a Y-shaped structure and the main axis of the mixing cylinder (4) is inclined to the axis of the second pipe joint (2). The included angle between the first pipe joint (1) and the second pipe joint (2) is greater than 90°. The tip of the mixing and turbulence device (5) is located below the main axis of the mixing cylinder (4), and the tip of the mixing and turbulence device (5) is open.

2. The mixing device for simulating the two-phase state of oil and gas in an aero-engine as described in claim 1, characterized in that: O-rings (6) are provided between the first pipe joint (1), the second pipe joint (2), the third pipe joint (3) and the mixing cylinder (4).

3. The mixing device for simulating the two-phase state of oil and gas in an aero-engine as described in claim 1, characterized in that: The number of vents gradually decreases from the bottom to the top of the cone.

4. The mixing device for simulating the two-phase state of oil and gas in an aero-engine as described in claim 1, characterized in that: The first pipe joint (1), the second pipe joint (2) and the third pipe joint (3) are all threadedly connected to the mixing cylinder (4).

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