Anti-cavitation structure of fuel pump
An anti-cavitation, fuel pump technology, applied in the direction of pumps, pump components, non-variable-capacity pumps, etc., can solve problems such as anti-cavitation of fuel pumps
Active Publication Date: 2021-04-06
JINCHENG NANJING ELECTROMECHANICAL HYDRAULIC PRESSURE ENG RES CENT AVIATION IND OF CHINA
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Problems solved by technology
[0004]
Purpose of the invention: to solve the technical problem of fuel pump anti-cavitation
Method used
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[0023] The present invention will be further described in detail through specific embodiments below.
[0024] An anti-cavitation structure of a fuel pump is provided, including a volute 1, a guide vane 2 and a centrifugal impeller 3; the volute includes an axial oil inlet channel 4 and a radial oil outlet channel 5, and the centrifugal impeller 3 After the incoming oil is pressurized, it is exported from the radial passage, and the guide vane 2 is fixed in the radial oil outlet passage 5 for guiding the pressurized fuel;
[0025] The volute housing is provided with a diversion passage 7, one end of the diversion passage is opened in the radial oil outlet passage 6, and the other end is opened in the axial oil inlet passage 8; it is used to pressurize the centrifugal impeller The fuel oil is introduced into the upstream of the centrifugal impeller, and the fuel inflowing from the upstream is pressurized; the ratio of the cross-sectional area of the guide passage to the cross-...
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The invention belongs to the field of aviation fuel pumps, and relates to an anti-cavitation structure of a fuel pump. The structure comprises a volute 1, a guide vane 2, a centrifugal impeller 3, an axial oil inlet channel opening 4, a radial oil outlet channel 5, a drainage hole opening 6, a drainage hole 7, a drainage hole opening 8, a retainer 9 and an induction impeller 10. An aviation fuel pump is a core part of an aviation fuel system. In a high altitude state of an air plane, the air pressure is very low, a fuel tank communicates with the external atmosphere, the fuel level pressure is also very low, the fuel is easily cavitated due to the fact that the fuel is lower than saturated vapor pressure when the air pressure is low and the flow is large, the cavitation phenomenon is caused to the fuel pump, and the fuel pump loses the function and performance, thereby even threatening aircraft flight safety. A high-pressure fuel supercharged by the impeller in the radial oil outlet channel of the volute of the fuel pump is guided to the upstream of the centrifugal impeller of the fuel pump through the volute drainage hole, so that the fuel pressure at the inlet of the fuel pump is increased, the fuel cavitation phenomenon of the fuel pump in a high-altitude state is improved, and the cavitation resistance of the fuel pump is improved at the cost of sacrificing part of the hydraulic efficiency of the fuel pump.
Description
technical field [0001] The invention belongs to the field of aviation fuel pumps and relates to a fuel pump anti-cavitation structure. Background technique [0002] The aviation fuel pump is the core component of the aviation fuel system. When the aircraft is at high altitude, the air pressure is very low, the fuel tank is connected to the outside atmosphere, and the oil surface pressure is also very low. The cavitation phenomenon will cause the fuel pump to lose its function and performance, and even threaten the flight safety of the aircraft. [0003] In order to improve the anti-cavitation ability of the fuel pump, the present invention proposes an anti-cavitation structure of the fuel pump to increase the fuel pressure at the inlet of the fuel pump, improve the high-level cavitation phenomenon of the fuel pump, and improve the anti-cavitation ability of the fuel pump. Contents of the invention [0004] The purpose of the invention is to solve the technical problem of ...
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IPC IPC(8): F04D29/66F04D29/42F04D29/44F04D29/22F02C7/22
CPCF04D29/669F04D29/426F04D29/448F04D29/2222F02C7/22
Inventor 崔宗泰刘娟沈洵胡红林苌城
Owner JINCHENG NANJING ELECTROMECHANICAL HYDRAULIC PRESSURE ENG RES CENT AVIATION IND OF CHINA