Flow-empty prevention device for diesel engine fuel oil low-pressure pipeline

Abstract

The invention discloses a flow-empty prevention device for a diesel engine fuel oil low-pressure pipeline. The flow-empty prevention device comprises an oil inlet pipe connecting an oil tank with an oil delivery pump. A flow-empty prevention mechanism is arranged at the input end of the oil inlet pipe and comprises a hollow-structure cylinder inserted in an inner hole of the oil inlet pipe. An annular boss is arranged in an inner cavity of the cylinder and divides the inner cavity of the cylinder into an inlet cavity and an outlet cavity. A spring is arranged in the outlet cavity. The two endsof the spring are provided with a limiting part and a seal part correspondingly, the limiting part is used for blocking the spring, and the seal part can seal the rotary face of the annular boss. Thetwo ends of the spring tightly abut against the limiting part and the seal part correspondingly. Through the flow-empty prevention device, the flow-empty condition of the diesel engine fuel oil low-pressure pipeline can be effectively prevented, simple and practical effects are achieved, and cost is low.

Description

technical field [0001] The invention relates to the technical field of engine fuel supply, more specifically, it relates to an anti-flow emptying device for a low-pressure fuel pipeline of a diesel engine. Background technique [0002] The fuel system of the engine is an important factor affecting its starting performance, such as figure 1 As shown, the fuel system is generally composed of fuel tank A, fuel inlet pipe B, diesel pre-filter C, fuel delivery pump D, diesel fine filter E, fuel injection pump F, fuel injector G, and fuel return pipe H. The air entering the fuel system is one of the most common faults of diesel engines. It will cause poor or interrupted diesel fuel supply, which will cause difficulty in starting and unstable operation; especially the standby emergency diesel engine, the shutdown time is very long. , has very high requirements for starting performance; at present, the main method to solve the problem of air entering the fuel system is to improve t...

AI Technical Summary

Problems solved by technology

The air entering the fuel system is one of the most common faults of diesel engines. It will cause poor or interrupted diesel oil supply, which will cause difficulty in starting and unstable operation; especially the standby emergency diesel engine, the shutdown time is very long. , has very high requirements on starting performance; at present, the main method to solve the problem of air entering the fuel system is to improve the starting performance of the engine by optimizing the components and overall layout design after the fuel delivery pump, ignoring the impact of the low-pressure pipeline before the fuel delivery pump on engine startup. Impact

[0003] At present, most of the generators in the generator set industry are equipped with low-level fuel tanks, and the low-pressure oil circuit of the fuel system of the diesel engine is connected by a large number of plastic pipes. With the extension of use time, the oil pipes are prone to aging, deterioration and hardening, especially the oil pipes and joints are prone to failure. Leakage, and most of the filters will also accumulate air with the prolongation of the use time. Under the action of the gravity potential energy of the diesel in the pipe, it will cause the diesel in the low-pressure pipeline to flow out and enter the air, making it difficult to start the engine. A lot of work such as emptying the oil system

[0004] Especially for emergency engine units, due to the long shutdown time of the engine and the requirement that the engine can be started immediately when in use, if there is air in the low-pressure pipeline, it will seriously affect the success rate of the engine's one-time start and cause unnecessary economic losses.

[0005] At present, there is a lack of a device that can effectively prevent the low-pressure pipeline of the diesel engine from flowing out

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