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Fuel gear pump intended, in particular, as a high-pressure pump

A fuel pump and gear pump technology, which is applied in the fuel delivery of turbine/propulsion devices, components of pumping devices for elastic fluids, liquid fuel engines, etc., can solve problems such as insufficient gear meshing pressing force

Active Publication Date: 2017-02-15
SAFRAN AIRCRAFT ENGINES SAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, if the pressure at the pump terminals decreases, the gear mesh squeeze becomes insufficient

Method used

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  • Fuel gear pump intended, in particular, as a high-pressure pump
  • Fuel gear pump intended, in particular, as a high-pressure pump
  • Fuel gear pump intended, in particular, as a high-pressure pump

Examples

Experimental program
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Embodiment Construction

[0023] We will now describe the first figure.

[0024] figure 1 The fuel circuit of an aircraft engine is shown. The aircraft fuel tank 1 feeds a low-pressure pump 2 , which subsequently feeds a high-pressure pump 4 through a filter and exchanger 3 . The pressurized fuel is supplied to the proportional pump 5, which feeds the combustion chamber 6, the actuator and the servo valve 7; as with the fluid used in the actuator and servo valve 7, the excess flow is returned to the high pressure pump through the return conduit 8 4 upstream.

[0025] This device does not limit the invention as it relates to a dedicated pump which is of particular benefit in this application and this device, but is fully adaptable to other applications and devices.

[0026] will now discuss figure 2 and image 3 .

[0027] figure 2 A perspective view showing essential parts of a known high-pressure pump 4 to be improved by the present invention, image 3Is the general layout of the device. Th...

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PUM

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Abstract

A fuel gear pump (4') works to supply a pre-defined flow rate, but with low or zero pressure rise. In order to ensure the hydrodynamic lifting of bearings (19) supporting the pinions (11), or some of them, a sealing lining (46) is added between them, in order to delimit a closed cavity (47), in order to ensure lifting by a fluid having more suitable viscosity properties, instead of the lifting being ensured by the fuel itself which is pumped. Possible application to fuel pumps of aircraft engines, in which the pump (4') is a high-pressure pump combined with a low-pressure pump.

Description

technical field [0001] The subject of the invention is a gear pump designed in particular as a high-pressure fuel pump, without excluding other applications. Background technique [0002] An aircraft engine includes a main fuel pump at the heart of its governing system. Aircraft engines supply fuel to the combustion chambers by pumping the required flow from the fuel tank. The output flow from these pumps is also used as hydraulic fluid to actuate actuators similar to those used to open the airflow discharge dampers from the engine core flow to the fan flow. [0003] The pump may comprise two stages, a low-pressure pump and a high-pressure pump, the invention being more particularly suitable for high-pressure pumps. These two stages have different functions: the former outputs the pressure increment of the applied flow, and the latter outputs the flow of the applied pressure difference at its limit. These two stages are usually combined into the same housing to save space...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C2/18F04C15/00F02C7/236
CPCF02C7/236F04C2/18F04C15/0038F04C2210/1044F05D2240/53F01D25/186F04D1/00F04D13/12F04D29/0473F04C11/005Y02T50/60F04C2/08F04C11/001F04C2240/30F05D2220/323
Inventor 飞利浦·沃特努尔贝拉·瓦萨
Owner SAFRAN AIRCRAFT ENGINES SAS