CN211737339U - Air removing structure of low-pressure fuel system of engine - Google Patents

Abstract

The utility model relates to an engine low pressure fuel oil system air clearing structure, including main fuel tank, bellytank, oil feed change-over valve, fuel strainer, fuel fine filter, fuel injection pump, engine and oil return change-over valve, the oil-out of main fuel tank and bellytank passes through the pipe connection oil feed change-over valve, and the oil feed change-over valve passes through the oil inlet of pipe connection fuel strainer, and the oil-out of fuel strainer passes through the pipe connection fuel fine filter, and the oil-out of fuel fine filter passes through the pipe connection engine, and the engine passes through the pipe connection oil return change-over valve, and the oil return change-over valve passes through the oil inlet of pipe; an exhaust electric pump is arranged in the fuel oil coarse filter. The utility model discloses utilize the inside electric pump of fuel strainer with the air pump to the oil tank of engine low pressure oil circuit to avoided the harmful effects that the air caused in the engine low pressure oil circuit, can effectively improve engine start and dynamic property.

Description

An air scavenging structure for an engine low-pressure fuel system

technical field

The utility model relates to an air removal structure for an engine low-pressure fuel system, which belongs to the technical field of a diesel engine fuel supply system.

Background technique

Due to the improvement of the performance of the vehicle diesel engine, it will inevitably lead to further improvement and improvement of the low-pressure fuel supply system of the engine. The air in the low pressure fuel supply system of the engine can make the vehicle difficult to start, and in severe cases it will not be able to start. Therefore, the removal of air in the low pressure fuel supply system of the engine plays a crucial role in the performance of the diesel engine. Therefore, in order to ensure the efficient and reliable operation of the low-pressure oil supply system, its functions must be improved.

SUMMARY OF THE INVENTION

The purpose of the utility model is to overcome the deficiencies in the prior art, and to provide an engine low-pressure fuel system air removal structure, which is used to actively and forcefully discharge air, and has strong layout advantages and market competitiveness.

According to the technical scheme provided by the present utility model: an engine low-pressure fuel system air scavenging structure, including a main fuel tank, an auxiliary fuel tank, an oil inlet switching valve, a crude fuel filter, a fuel fine filter, a fuel injection pump, an engine and an oil return switching valve. The oil outlet of the main fuel tank and the auxiliary fuel tank is connected to the oil inlet switching valve through a pipeline, and the fuel inlet switching valve is connected to the oil inlet of the primary fuel filter through a pipeline, and the oil outlet of the primary fuel filter is connected to the secondary fuel filter through a pipeline. The oil outlet is connected to the engine through a pipeline, the engine is connected to the oil return switching valve through a pipeline, and the oil return switching valve is connected to the oil inlet of the main fuel tank and the auxiliary fuel tank through a pipeline;

The primary fuel filter comprises a main casing, a lower end cover is arranged in the main casing, the lower end cover forms two upper and lower cavities in the main casing, the upper cavity is a filter cavity, and the upper end of the lower end cover is provided with a filter element assembly, the The main casing is provided with an oil inlet that communicates with the filter cavity; the cavity below the filter cavity is divided into an exhaust cavity, an exhaust electric pump is arranged in the exhaust cavity, and the output end of the exhaust electric pump is connected to the oil outlet; A first conduit is arranged in the middle of the filter element assembly, and the lower end of the first conduit passes through the lower end cover and communicates with the exhaust chamber.

Further, the filter element assembly is also provided with a second conduit, the second conduit is shorter than the first conduit, the outlet of the second conduit is connected to the one-way valve, and the outlet of the one-way valve is connected to the oil outlet.

Further, the oil inlet switching valve and the oil return switching valve are combined into a fuel switching valve.

Further, the main fuel tank and the auxiliary fuel tank are connected in parallel.

Compared with the prior art, the utility model has the following advantages:

(1) It can actively remove the air in the low-pressure fuel supply system of the engine.

(2) The electric pump inside the primary fuel filter is used to pump the air from the low-pressure oil circuit of the engine to the fuel tank, thereby avoiding the adverse effects caused by the air in the low-pressure oil circuit of the engine, and can effectively improve the starting and power performance of the engine.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic diagram of the structure of the fuel pre-filter.

Description of reference numerals: 1-main fuel tank, 2-auxiliary fuel tank, 3-fuel inlet switching valve, 4-fuel primary filter, 5-fuel secondary filter, 6-fuel injection pump, 7-engine, 8-fuel return switching valve, 9- Fuel switching valve, 41- Main casing, 42- Lower end cover, 43- Filter element assembly, 44- Oil inlet, 45- Filter cavity, 46- Exhaust cavity, 47- Exhaust electric pump, 48- Out Oil port, 49-first conduit, 410-second conduit, 411-check valve.

Detailed ways

The utility model and the embodiments are further described below in conjunction with the specific drawings.

As shown in Figure 1, an engine low-pressure fuel system air purging structure includes a main fuel tank 1, an auxiliary fuel tank 2, a fuel inlet switching valve 3, a primary fuel filter 4, a secondary fuel filter 5, a fuel injection pump 6, an engine 7 and a return oil Switching valve 8, the oil outlet of the main fuel tank 1 and the auxiliary fuel tank 2 is connected to the oil inlet switching valve 3 through the pipeline, and the oil inlet switching valve 3 is connected to the oil inlet of the primary fuel filter 4 through the pipeline, and the oil outlet of the primary fuel filter 4 The fuel fine filter 5 is connected through a pipeline, the oil outlet of the fuel filter 5 is connected to the engine 7 through a pipeline, the engine 7 is connected to the oil return switching valve 8 through a pipeline, and the oil return switching valve 8 is connected to the main fuel tank 1 and the auxiliary fuel tank 2 through pipelines. mouth;

As shown in FIG. 2 , the primary fuel filter 4 includes a main casing 41 . A lower end cover 42 is arranged in the main casing 41 . The lower end cover 42 forms two upper and lower cavities in the main casing 41 , and the upper cavity is a filter cavity. 45, the upper end of the lower end cover 42 is provided with a filter element assembly 43, the main housing 41 is provided with an oil inlet 44 that communicates with the filter cavity 45; the cavity below the filter cavity 45 is divided into an exhaust cavity 46, An exhaust electric pump 47 is arranged in the exhaust cavity 46, and the output end of the exhaust electric pump 47 is connected to the oil outlet 48; a first conduit 49 is arranged in the middle of the filter element assembly 43, and the lower end of the first conduit 49 passes through the lower end cover 42 communicates with the exhaust chamber 46 .

The filter element assembly 43 is also provided with a second conduit 410 , the second conduit 410 is shorter than the first conduit 49 , the outlet of the second conduit 410 is connected to the check valve 411 , and the outlet of the check valve 411 is connected to the oil outlet 48 .

The oil inlet switching valve 3 and the oil return switching valve 8 are combined into a fuel switching valve 9 .

The main fuel tank 1 and the auxiliary fuel tank 2 are connected in parallel, and the outlet of the main fuel tank 1 is provided with an fuel inlet switching valve 3, so that the system can adapt to different ambient temperatures and working conditions, thereby saving fuel costs.

An exhaust electric pump 47 is arranged in the primary fuel filter 4, which can make the fuel or air flow in the low-pressure oil circuit. The main fuel tank 1, the auxiliary fuel tank 2, the fuel inlet switching valve 3, the primary fuel filter 4, the secondary fuel filter 5, the fuel injection pump 6, the engine 7 and the fuel return switching valve 8 constitute the low pressure fuel system circuit of the engine.

The utility model firstly turns on the ignition switch to supply power to the exhaust electric pump 47, so that the exhaust electric pump 47 can be used to pump the air in the main fuel tank 1, the auxiliary fuel tank 2 and the fuel inlet switching valve 3 at the front end of the fuel prefilter 4 to the fuel prefilter 4 inside, and then pump to the engine 7, and then return to the main oil tank 1 and the auxiliary oil tank 2 through the oil return pipeline of the engine 7.

It can be understood that the above embodiments are only exemplary embodiments adopted to illustrate the principle of the present invention, but the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims (4)

1. An engine low-pressure fuel system air scavenging structure, characterized in that it comprises a main fuel tank (1), an auxiliary fuel tank (2), an oil inlet switching valve (3), a primary fuel filter (4), a fine fuel filter (5), A fuel injection pump (6), an engine (7) and an oil return switch valve (8), the oil outlets of the main fuel tank (1) and the auxiliary fuel tank (2) are connected to the oil inlet switch valve (3) through pipelines, and the oil inlet switch The valve (3) is connected to the oil inlet of the primary fuel filter (4) through a pipeline, the oil outlet of the primary fuel filter (4) is connected to the secondary fuel filter (5) through a pipeline, and the oil outlet of the primary fuel filter (5) is connected through a pipeline Connect the engine (7), the engine (7) is connected to the oil return switching valve (8) through a pipeline, and the oil return switching valve (8) is connected to the oil inlets of the main fuel tank (1) and the auxiliary fuel tank (2) through a pipeline; The primary fuel filter (4) includes a main casing (41), a lower end cover (42) is arranged in the main casing (41), and the lower end cover (42) forms two upper and lower cavities in the main casing (41), The upper cavity is a filter cavity (45), the upper end of the lower end cover (42) is provided with a filter element assembly (43), and the main housing (41) is provided with an oil inlet (44) that communicates with the filter cavity (45). ); the cavity below the filter cavity (45) is divided into an exhaust cavity (46), an electric exhaust pump (47) is arranged in the exhaust cavity (46), and the output end of the electric exhaust pump (47) is connected to An oil port (48); a first conduit (49) is arranged in the middle of the filter element assembly (43), and the lower end of the first conduit (49) communicates with the exhaust chamber (46) through the lower end cover (42). 2. The structure for removing air from a low-pressure fuel system of an engine according to claim 1, wherein the filter element assembly (43) is further provided with a second conduit (410), and the second conduit (410) is shorter than the first conduit (410). The conduit (49), the outlet of the second conduit (410) is connected to the one-way valve (411), and the outlet of the one-way valve (411) is connected to the oil outlet (48). 3 . The air purging structure of the low-pressure fuel system of an engine according to claim 1 , wherein the oil inlet switching valve ( 3 ) and the oil return switching valve ( 8 ) are combined into a fuel switching valve ( 9 ). 4 . 4. The air purging structure of the low-pressure fuel system of an engine according to claim 1, wherein the main fuel tank (1) is connected in parallel with the auxiliary fuel tank (2).

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