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Magnetic suspension outer culvert fan used for aero-turbofan engine

A technology of turbofan engine and magnetic levitation, which is applied in the direction of machines/engines, liquid fuel engines, and components of pumping devices for elastic fluids, etc. It can solve problems such as complex gear transmission mechanism, increased engine weight, and harsh working conditions. Achieve the effect of reducing design difficulty, reducing processing difficulty and improving work efficiency

Active Publication Date: 2017-11-03
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the many high-speed and heavy-duty gears and bearings, the working conditions are harsh and the number of parts is large, so it is difficult to ensure high reliability
And the gear transmission mechanism is very complicated, which greatly increases the weight of the engine

Method used

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  • Magnetic suspension outer culvert fan used for aero-turbofan engine
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  • Magnetic suspension outer culvert fan used for aero-turbofan engine

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Embodiment Construction

[0015] A magnetic levitation external fan for aviation turbofan engines proposed by the present invention will be described in detail below in conjunction with the accompanying drawings. In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "left", "right", "upper", "lower", "bottom" etc. is based on the orientation or positional relationship shown in the drawings The positional relationship is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, "first", "second", etc. It does not indicate the importance of components, so it should not be construed as limiting the present invention. The specific dimensions used in this embodiment are only for illustrating the technical solution, and do not limit th...

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Abstract

The invention discloses a magnetic suspension outer culvert fan used for an aero-turbofan engine. The magnetic suspension outer culvert fan comprises an outer casing, a distribution casing, a hub, fan blades, blade tip magnetic rings and the like, wherein the outer casing comprises coils which are distributed on the outer casing body and have different winding directions, a controller and an axial displacement sensor. Each blade tip magnetic ring part comprises permanent magnets circumferentially arranged on the magnetic ring. The fan blades are mounted on the hub. The permanent magnets surround the hub circumferentially. The distribution casing comprises a coil surrounding the distribution casing body, a radial displacement sensor and a controller. The outer culvert fan has no mechanical relation with the internal turbojet engine, and thus the rotation speed of the fan can be adjusted in real time. The working efficiency of the aero-turbofan engine is greatly improved, the steps of a low-pressure gas compressor and a turbine are lowered, the engine mass is lowered, and the engine overall performance is improved. The design difficulty and the machining difficulty of the aero-turbofan engine are greatly lowered.

Description

technical field [0001] The invention belongs to the technical field of impeller machinery, and in particular relates to a magnetic levitation external fan used for an aviation turbofan engine. Background technique [0002] At present, in high-bypass turbofan engines with high thrust (greater than 70.00 kN), the fans are directly driven by the low-pressure turbine; generally, a 3-5 stage booster compressor (sometimes also called a low-pressure compressor) is installed behind the fan rotor. To increase the total pressure ratio of the engine and the internal air flow. However, this design has inherent disadvantages, that is, the fan is connected to the low-pressure turbine shaft, and at the same time, there is a booster compressor inside. Therefore, in order to take into account the boost ratio and speed of the inside, the fan speed will not be very small, resulting in the linear speed of the outside fan. If it is too large, when the outer diameter is too large, the shock wave...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02K3/04F04D25/08F04D29/40F04D27/00
CPCF02K3/04F04D25/08F04D27/004F04D29/403F05D2220/36
Inventor 屠宝锋
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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