Turbomachine Lubrication System with an Anti-Siphon Valve for Windmilling

Inactive Publication Date: 2014-11-13
TECHSPACE AERO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present application is about an oil feed system and turbojet for aircraft. The oil feed system is automatic and can be easily opened or closed depending on the turbojet's operating condition. The system has several modes of operation depending on the fan's rotational speed, and can lubricate the bearings and cut off the circulation to prevent leaks without any external control. The system is safe and efficient, providing full flow at conventional speeds and cutting off when the turbojet is at rest.

Problems solved by technology

However, the number of devices to be controlled, and the various modes to be taken into account necessitate a large number of control valves and a plurality of controls and sensors.
Their number increases the cost of such an oil circuit, and its reliability is reduced.
However, it requires complex control mechanisms.
The safety of this system when windmilling is based on calibrated valves, the latter being subject to attack by flames in the event of a turbomachine fire.
In addition, this system does not meet the specific needs of certain devices in terms of safety, as these devices must remain supplied with oil in the event of windmilling.

Method used

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  • Turbomachine Lubrication System with an Anti-Siphon Valve for Windmilling
  • Turbomachine Lubrication System with an Anti-Siphon Valve for Windmilling
  • Turbomachine Lubrication System with an Anti-Siphon Valve for Windmilling

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Experimental program
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first embodiment

[0045]FIG. 2 is a representation of a turbojet 2 with an oil feed system according to the present application.

[0046]The oil is fed from the tank 16 to the various devices on the turbojet 2 via a primary feed 24. The devices may comprise a chamber for lubricating a bearing and a heat exchanger. The system includes a first feed pump 26 placed on the primary feed 24 and which draws oil from the tank 16. The pump's suction and discharge rates can be set according to its speed. That may be its rotational speed in the case of a rotary pump, or its frequency in the case of an oscillating pump. These pressures are also dependent on the viscosity of the oil at a given temperature.

[0047]The feed system further comprises a first means of closure, such as an anti-siphon valve 28, designed to prevent or enable the flow of oil from the tank 16 to the devices. It may be located at the lowest point of the tank 16. The valve 28 is located upstream of the first pump 26, and preferably upstream of any...

second embodiment

[0057]FIG. 3 illustrates a turbojet 2 with an oil feed system in accordance with the present application. FIG. 3 has the same numbering scheme as in previous figures for the same or similar elements, but the numbering is incremented by 100. Specific numbers are used for items specific to this embodiment.

[0058]The feed system comprises a tank 116, a primary feed 124 and a secondary feed 125. They are both connected to the tank 116. The primary feed 124 comprises a first valve 128 and a first feed pump 126 downstream. The secondary feed 124 comprises a second valve 128 and a second feed pump 126 downstream. These feeds are advantageously in parallel. They each supply different devices For example, one may supply a bearing, and the other a heat exchanger.

[0059]The feed system comprises a scavenge pipe 130 with a scavenge pump 132. This scavenge pipe can be divided upstream and enables oil to be collected from different devices at different rates and pressures. The pumps (126, 127, 132)...

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Abstract

The present application relates an oil feed system for a turbomachine having a tank designed to contain a volume of oil, a pump designed to suck the oil from the tank and discharge it to at least one device on the turbomachine, and an anti-siphon valve designed to prevent the flow of oil to the device or devices. The anti-siphon valve is located upstream of the pump and is designed to allow the flow of oil when the speed of the pump becomes higher than a speed R1. The present application also relates to a turbojet fitted with a fan and two anti-siphon valves designed to open at different rotational speeds of the first pump.

Description

[0001]This application claims priority under 35 U.S.C. §119 to European Patent Application No. 13167305.5, filed 10 May 2013, titled “Turbomachine Lubrication System with an Anti-Siphon Valve for Windmilling,” which is incorporated herein by reference for all purposes.BACKGROUND[0002]1. Field of the Application[0003]The present application relates to a circuit for distributing oil to an aircraft turbomachine. More specifically, the present application relates to one or more hydraulic circuits for actuating, cooling and / or lubricating the devices in an aircraft turbine engine. The present application relates also to an axial turbomachine in accordance with the present application.[0004]2. Description of Related Art[0005]An A turbomachine uses oil for different functions. This oil can be used both to lubricate moving parts and to cool them. The oil may also be used to actuate or feed devices because of its pressure. For example, it can be used to adjust the pitch of the fan blades of ...

Claims

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Application Information

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IPC IPC(8): F01C21/04
CPCF01C21/045F01D25/18F01D25/20F01M2001/123F01M1/12F01M2001/126F02C7/06F01M7/00
InventorRAIMARCKERS, NICOLASCORNET, ALBERT
OwnerTECHSPACE AERO