A fuel pump with safety valve

Abstract

The invention relates to a fuel pump with a safety valve. The fuel pump comprises a fuel pump body (1), an upper cover (2) and a lower cover (3), wherein a negative pressure spring (10), a spring convex piece (9) and a negative pressure membrane (8) are sequentially arranged between the upper cover (2) and the fuel pump body (1); an oil outlet membrane (7) is arranged between the lower cover (3) and the fuel pump body (1); the fuel pump body (1) is internally provided with an oil inlet chamber (16), a negative pressure control chamber (17) and an oil outlet chamber (18); a one-way valve piece (6) and a limiting piece (5) are respectively installed at the outlet of the oil inlet chamber (16) and the inlet of the oil outlet chamber (18); the fuel pump body (1) is further provided with an oil inlet tube (13); and an oil inlet spring (11) and a ball valve (12) are arranged at the intersection of the oil inlet tube (13) and the fuel pump body (1). The fuel pump provided by the invention has the advantages of stable working, strong environmental adaptability and long service life.

Description

technical field [0001] The invention relates to a component of an oil inlet system of a general mechanical engine, in particular to a fuel pump with a safety valve. Background technique [0002] For fuel engine products, the fuel in the fuel tank is usually supplied to the engine under the action of gravity, but when many engines are designed, due to various reasons, the position of the fuel tank is very low, resulting in insufficient pressure when the fuel is supplied to meet the engine's work requirements. Therefore, the fuel pump is designed, and the fuel pump is widely used in the engine design where the position of the fuel tank is low and the fuel supply pressure cannot meet the engine demand. The oil well outlet pipe in the oil supply chamber of the fuel pump enters the engine, and after the engine is saturated with oil, a part of the pressure oil will return to the oil supply chamber of the fuel pump through the return pipe. During this process, due to the oil return...

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Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art, to provide a fuel pump with a safety valve that is stable in operation, strong in adapting to the environment, and has a long service life, so as to solve the problem of instantaneous closing of the accelerator when the engine is reduced from high speed to low speed. Instantaneous high-pressure oil return pressure will damage the diaphragm and components of the fuel pump, resulting in unstable oil supply to the engine and even oil leakage.

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