CN217270557U - Fuel pipeline exhaust apparatus and engine - Google Patents

Abstract

The utility model relates to the technical field of engine fuel supply systems, and discloses a fuel pipeline exhaust device and an engine, wherein the fuel pipeline exhaust device comprises a shell and a floating valve core positioned in the shell; a cavity is arranged in the shell, an oil inlet communicated with the cavity is formed in the side wall of the shell, an air outlet communicated with the cavity is formed in the top wall of the shell, and an oil outlet communicated with the cavity is formed in the bottom wall of the shell; the floating valve core comprises a valve core main body, the valve core main body is movably arranged in the cavity and used for floating on fuel oil in the cavity, a first plugging portion is arranged on one side, facing the top wall of the shell, of the valve core main body, and a second plugging portion is arranged on one side, facing the bottom wall of the shell, of the valve core main body. The fuel pipeline exhaust device can automatically discharge air in an oil return pipeline of an engine without manual operation, so that the normal operation of the engine is ensured, the oil return pipeline is automatically closed when the engine is started for the first time, an oil transfer pump cannot suck air, and the normal starting is not influenced.

Description

Fuel pipeline exhaust device and engine

Technical Field

The utility model relates to an engine fuel oil supply system technical field, in particular to fuel oil pipeline exhaust apparatus and engine.

Background

At present, an exhaust device is generally arranged on a low-pressure fuel pipeline of a diesel engine, however, exhausted gas and fuel are connected to an oil return passage of the diesel engine, some oil return passages are directly connected to an oil inlet passage, the exhausted gas in the front can be sealed in the pipeline, the pipeline cannot be exhausted, and then the exhausted gas enters the oil inlet passage again, so that the normal operation of the diesel engine is influenced.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a fuel pipeline exhaust apparatus and engine, among this fuel pipeline exhaust apparatus, can rely on floating of floating case, make the fuel flow from the oil-out smoothly, and can discharge the gas in the fuel pipeline through the gas vent outside the pipeline, under the condition that does not need artificial operation, realize the air in the automatic discharge engine oil return pipeline, guarantee engine normal operating, and the engine starts for the first time, it is empty for the time to return the oil pipeline, return oil pipeline self-closing, the fuel delivery pump can not inhale empty, do not influence normal start.

In order to achieve the above purpose, the utility model provides the following technical scheme:

a fuel line vent apparatus comprising: the valve comprises a shell and a floating valve core positioned in the shell;

a cavity for containing fuel oil is arranged in the shell, an oil inlet communicated with the cavity is formed in the side wall of the shell, an exhaust port communicated with the cavity is formed in the top wall of the shell, the exhaust port is far away from the liquid level of the fuel oil in the cavity, and an oil outlet communicated with the cavity is formed in the bottom wall of the shell;

the floating valve core comprises a valve core main body, the valve core main body is movably arranged in the cavity along the direction that the bottom wall of the shell points to the top wall of the shell, the valve core main body is used for floating on fuel oil in the cavity, one side, facing the top wall of the shell, of the valve core main body is provided with a first plugging portion used for plugging the exhaust port, and one side, facing the bottom wall of the shell, of the valve core main body is provided with a second plugging portion used for plugging the oil outlet.

In the fuel pipeline exhaust device, fuel can smoothly flow out of the oil outlet by depending on the floating of the floating valve core, and gas in the fuel pipeline can be discharged out of the pipeline through the exhaust port, so that the air in an oil return pipeline of an engine can be automatically discharged without manual operation, the normal operation of the engine is ensured, the engine is started for the first time, the oil return pipeline is automatically closed when the oil return pipeline is empty, an oil transfer pump cannot suck air, and the normal starting is not influenced.

Optionally, when the second blocking portion is in sealing fit with the oil outlet, a gap is formed between the floating valve core and the bottom wall of the housing.

Optionally, a guide portion is arranged on the outer side of the top wall of the housing, the guide portion is opposite to the exhaust port, the guide portion is provided with a guide hole penetrating through the guide portion along a direction perpendicular to the top wall, and the guide hole is opposite to and communicated with the exhaust port; one side of the first plugging portion, which is far away from the valve core main body, is connected with a guide post, the guide post is in sliding fit with the guide hole, an exhaust channel is formed between the guide hole and the guide post, the exhaust channel is communicated with the exhaust port, and an air inlet of the exhaust channel is connected with the exhaust port.

Optionally, at least one strip-shaped vent groove extending along the extending direction of the axial lead of the guide hole is arranged on the inner wall of the guide hole, the vent groove is communicated with the exhaust port, and the vent groove forms the exhaust channel.

Optionally, a strip-shaped recessed portion extending along the extending direction of the axial lead of the guide post is arranged on the outer side of the guide post, the recessed portion is communicated with the exhaust port, and the recessed portion forms the exhaust passage; or,

have in the guide post along the extending direction of its axial lead and run through the through-hole of self, the guide post is close to the tip of the one end of first shutoff portion has the trompil, the trompil with the through-hole intercommunication, just the trompil with the gas vent passes through space intercommunication in the cavity, the terminal surface that the guide post deviates from first shutoff portion has the opening with the through-hole intercommunication, the through-hole constitutes exhaust passage.

Optionally, the first blocking part has a first conical structure, the side wall of the exhaust port has a first conical surface matching with the shape of the first conical structure, and when the first conical structure is completely matched with the first conical surface, the exhaust port is closed; and/or the presence of a gas in the gas,

the second blocking part is provided with a second conical structure, the side wall of the oil outlet is provided with a second conical surface matched with the shape of the second conical structure, and when the second conical structure is completely matched with the second conical surface, the oil outlet is closed.

Optionally, a circumferential side of the first blocking portion is sleeved with a first sealing ring, and/or a circumferential side of the second blocking portion is sleeved with a second sealing ring.

Optionally, a cavity structure is provided in the valve core body.

Optionally, an oil-gas separator communicated with the exhaust port is connected to the outer side of the top wall of the shell.

The utility model also provides an engine, including oil tank, oil feed route, oil return route, sprayer and an arbitrary fuel line exhaust apparatus who provides as above-mentioned technical scheme, the oil inlet of sprayer passes through the oil feed route with the oil tank is connected, the oil return opening of sprayer passes through the oil return route with the oil tank or the oil inlet of oil feed route is connected, wherein, fuel line exhaust apparatus connect in the oil return route, just fuel line exhaust apparatus's oil inlet with the oil return opening of sprayer is connected, fuel line exhaust apparatus's oil-out with the oil inlet of oil tank or oil feed route is connected.

Optionally, the engine further comprises a fuel coarse filter, a fuel delivery pump, a fuel fine filter and a high-pressure oil pump which are arranged in the oil inlet passage, and the fuel coarse filter, the fuel delivery pump, the fuel fine filter and the high-pressure oil pump are sequentially connected between the oil tank and the oil injector;

an oil outlet of the fuel oil pipeline exhaust device is connected with an oil inlet of the oil tank or the oil transfer pump through a first pipeline, and a heat exchanger is arranged in the first pipeline.

Drawings

Fig. 1 is a schematic structural diagram of a fuel pipeline exhaust device provided in an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

fig. 3 is a schematic structural diagram of a fuel pipeline exhaust device provided by an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a fuel pipeline exhaust device provided by an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view taken along line B-B of FIG. 4;

fig. 6 is a schematic structural view of the guide portion and the guide post according to an embodiment of the present invention;

FIG. 7 is a top view of the guide portion and guide post configuration of FIG. 6;

fig. 8 is a schematic structural view of the guide portion and the guide post according to the embodiment of the present invention;

FIG. 9 is a top view of the guide portion and guide post arrangement of FIG. 8;

fig. 10 is a schematic structural view of a guide portion and a guide post according to an embodiment of the present invention;

FIG. 11 is a top view of the guide portion and guide post arrangement of FIG. 10;

fig. 12 is a schematic structural diagram of a fuel supply system of an engine according to an embodiment of the present invention;

an icon: 1-an oil tank; 2-a fuel oil coarse filter; 3-an oil transfer pump; 4-essential oil coarse strainer; 5-a high-pressure oil pump; 6-oil injector; 7-fuel line exhaust; 8-an oil-gas separator; 9-a heat exchanger; 71-a housing; 72-a floating spool; 73-a first sealing ring; 74-a second seal ring; 711-chamber; 712-an oil inlet; 713-an oil outlet; 714-an exhaust port; 715-a guide part; 721-a valve cartridge body; 722-a first blocking portion; 723-a second occlusion; 724-guide post; 7151-pilot holes; 7152-vent channel; 7241-a recess; 7242-a through hole; 7243 opening holes.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As shown in fig. 1 and fig. 3, the embodiment of the present invention provides a fuel pipeline exhaust device, which is applied to a fuel supply system of an engine, and for convenience of description, the arrangement distribution direction of the top wall and the bottom wall of a housing 71 of the fuel pipeline exhaust device is a vertical direction. Specifically, this fuel pipeline exhaust apparatus includes: a housing 71 and a floating spool 72 located within the housing 71; a cavity 711 for containing fuel oil is arranged in the shell 71, the shell 71 is provided with a top wall and a bottom wall which are spaced up and down, side walls are connected around the edges of the top wall and the bottom wall and are positioned between the top wall and the bottom wall, an oil inlet 712 communicated with the cavity 711 is arranged on the side wall of the shell 71, an exhaust port 714 communicated with the cavity 711 is arranged on the top wall of the shell 71, the exhaust port 714 is far away from the liquid level of the fuel oil in the cavity 711, an oil outlet 713 communicated with the cavity 711 is arranged on the bottom wall of the shell 71, and the oil outlet 713 can be arranged opposite to the exhaust port 714; the floating valve core 72 specifically comprises a valve core main body 721, the valve core main body 721 is movably installed in the chamber 711 along the direction that the bottom wall of the housing 71 points to the top wall of the housing 71, the valve core main body 721 can move up and down along the vertical direction, the valve core main body 721 can float on the fuel in the chamber 711, the valve core main body 721 floats upwards by the buoyancy of the fuel flowing into the chamber 711, in addition, a first blocking part 722 for blocking the exhaust port 714 is arranged on one side of the valve core main body 721 facing the top wall of the housing 71, a second blocking part 723 for blocking the oil outlet 713 is arranged on one side of the valve core main body 721 facing the bottom wall of the housing 71, and the first blocking part 722 and the second blocking part 723 are respectively arranged on two sides of the valve core main body 721 and are opposite to each other.

When the fuel line exhaust described above is connected to the fuel supply system of the engine, the oil outlet 713 of the fuel line exhaust faces downward and the exhaust port 714 faces upward, and specifically the fuel line exhaust is installed into the return line of the fuel system, the specific exhaust principle is as follows: when the engine is not started or no fuel flows into the chamber 711 from the oil inlet 712, as shown in fig. 1 and fig. 2, the floating valve core 72 falls on the bottom of the chamber 711 due to the gravity of the floating valve core 72 and is located at the first station, the second blocking portion 723 of the floating valve core 72 is matched and sealed with the oil outlet 713, the oil outlet 713 is blocked by the second blocking portion 723 to prevent the fuel from being emptied, and the chamber 711 is communicated with the exhaust port 714, so that when the engine is started for the first time, the oil return line is empty, the oil transfer pump cannot be emptied, air cannot enter the fuel line, and an oil suction pump in the fuel supply system can normally suck oil in the oil tank, so that the engine is normally started; when fuel oil flows into the cavity 711 from the oil inlet 712, the fuel oil flows into the bottom of the cavity 711, the floating force of the fuel oil floats the floating valve core 72, the floating valve core 72 can float on the liquid level of the fuel oil, the floating valve core 72 is away from the bottom of the cavity 711 by a certain distance, the sealing between the second blocking part 723 and the oil outlet 713 is released, the second blocking part 723 is separated from the oil outlet 713, the fuel oil can flow out of the oil outlet 713, the floating height of the floating valve core 72 does not reach the top of the cavity 711, and the cavity 711 is communicated with the exhaust port 714, so that gas entering the cavity 711 from the oil inlet 712 can be discharged from the exhaust port 714 to the outside and discharged out of the fuel oil pipeline, and under the condition that no manual operation is needed, the air in the oil return pipeline of the engine can be automatically discharged, the normal operation of the engine is ensured, and as shown in fig. 3, the oil inlet 712 of the general fuel oil exhaust device cannot be excessively large, the float spool 72 generally floats on the fuel, with the top side not reaching the top wall of the housing 71; in addition, when the amount of fuel entering from the oil inlet 712 is relatively large, as shown in fig. 4 and 5, a certain preset amount is reached, that is, the whole cavity 711 can be filled, the floating height of the floating valve core 72 reaches the top of the cavity 711, the floating valve core 72 is located at the second station, the first blocking portion 722 can be in sealing fit with the exhaust port 714, and the first blocking portion 722 blocks the exhaust port 714 to prevent the fuel from overflowing.

Therefore, in the fuel pipeline exhaust device, fuel can smoothly flow out of the fuel outlet by depending on the floating of the floating valve core, gas in the fuel pipeline can be discharged out of the pipeline through the exhaust port, air in an oil return pipeline of an engine can be automatically discharged without manual operation, the normal operation of the engine is ensured, the engine is started for the first time, the oil return pipeline is automatically closed when the oil return pipeline is empty, an oil transfer pump cannot suck air, and the normal starting is not influenced.

In a possible embodiment, as shown in fig. 1, when the second blocking portion 723 is in sealing fit with the oil outlet 713, a certain gap is provided between the floating valve spool 72 and the bottom wall of the housing 71, and when the floating valve spool 72 falls on the bottom of the chamber 711, a gap is formed between the bottom side of the floating valve spool 72 and the bottom wall of the housing 71, so that the valve spool body 721 can be prevented from being completely buckled on the bottom surface of the chamber 711, fuel cannot flow below the valve spool body 721, the gap is good, fuel can easily flow to the bottom of the chamber 711, an upward buoyancy is generated on the floating valve spool 72, and it is beneficial for the floating valve spool 72 to easily float so that the oil outlet 713 is opened.

Moreover, as shown in fig. 1, in order to make the floating valve element float more easily, a cavity structure may be specifically provided in the valve element main body 721, so that the valve element main body 721 forms a hollow structure, and compared with its own weight, the floating valve element 72 may have sufficient buoyancy on fuel oil, so that the floating valve element is more convenient to float; in addition, the valve core main body 721 can be made of a material with a low density, so that the valve core main body 721 can float conveniently. Specifically, the valve body 721 may include a main core, the first blocking portion 722 and the second blocking portion 723 are respectively disposed at the upper and lower ends of the main core, the main core has a hollow structure inside, a side plate is disposed around the main core, a space is provided between the side plate and the main core, and one end of the side plate facing the first blocking portion 722 is connected to the main core through an extension plate facing the main core.

In the above-mentioned fuel pipeline exhaust device, as shown in fig. 3, in order to ensure the stability of the up-and-down movement of the floating valve core 72, a guide structure is provided between the floating valve core 72 and the housing 71, specifically, a guide part 715 is provided on the outer side of the top wall of the housing 71, the guide part 715 is opposite to the exhaust port 714, and the guide part 715 extends in the direction perpendicular to the top wall, a guide hole 7151 penetrating through the guide part 715 in the direction perpendicular to the top wall is provided on the guide part 715, the guide hole 7151 is opposite to and communicated with the exhaust port 714, and the guide hole 7151 is directly connected with the exhaust port 714; one side of the first blocking portion 722, which is away from the valve core main body 721, is connected with a guide post 724, the guide post 724 extends into the guide hole 7151 and is in sliding fit with the guide hole 7151, in order to exhaust smoothly, an exhaust passage is formed between the guide hole 7151 and the guide post 724, the exhaust passage is communicated with the exhaust port 714, and an air inlet of the exhaust passage is connected with the exhaust port 714, so that the exhaust is smooth.

There are various options for the arrangement of the exhaust gas passage between the pilot hole and the pilot post, preferably as follows:

the first method is as follows:

as shown in fig. 1 and 2, at least one strip-shaped vent groove 7152 extending along the extending direction of the axial line of the guide hole 7151 is disposed on the inner wall of the guide hole 7151, the vent groove 7152 is communicated with the exhaust port 714, a channel is formed between the vent groove 7152 of the guide hole 7151 and the outer wall of the guide post 724, the vent groove 7152 forms an exhaust channel, when the first blocking portion 722 is in sealing fit with the exhaust port 714, the air inlet of the vent groove 7152 is blocked, oil leakage can be effectively avoided, and the vent groove 7152 has a simple structure and is convenient to manufacture.

Specifically, the number of the vent grooves 7152 may also be two, three, or other numbers, which is not limited in this embodiment, each vent groove 7152 is circumferentially distributed around the axis of the axial line of the guide hole 7151 at intervals, and each vent groove 7152 is communicated with the exhaust port 714, so that smooth exhaust is facilitated.

The second method comprises the following steps:

as shown in fig. 6 to 8, a strip-shaped recess 7241 extending in the extending direction of the axial line of the guide post 724 is provided on the outer side of the guide post 724, the recess 7241 communicates with the exhaust port 714, a passage is formed between the recess 7241 of the guide post 724 and the inner wall of the guide hole 7151, and the recess 7241 constitutes an exhaust passage; when the first blocking portion 722 is in sealing fit with the air outlet 714, the air inlet of the recess 7241 is blocked, so that oil leakage can be effectively avoided, and the recess 7241 has a simple structure and is convenient to manufacture.

Specifically, the number of the concave portions 7241 may be two, three, four, or other numbers, which is not limited in this embodiment, and each concave portion 7241 is distributed at intervals around the axis of the axial line of the guide post 724, and each concave portion 7241 is communicated with the exhaust port 714, which is more favorable for smooth exhaust.

As shown in fig. 6 and 7, the shape of the recess may be formed by cutting off a portion of the side surface of the guide post 724 directly along the extending direction of the shaft axis to form a plane, and the recess 7241 may be an arc-shaped notch when viewed in cross section of the guide post 724; alternatively, as shown in fig. 8 and 9, the recess 7241 is directly a strip-shaped groove on the outer wall of the guide post 724, the groove extending in the extending direction of the shaft axis of the guide post 724, further, the number of the grooves may be two, and each groove may penetrate the guide post 724 through the shaft axis of the guide post 724, the two grooves intersect, and the groove is in a cross-shape as viewed in the cross-section of the guide post 724.

The third method comprises the following steps:

as shown in fig. 10 and 11, a through hole 7242 penetrating through the guide post 724 along the extending direction of the axial line thereof is arranged in the guide post 724, an end portion of the guide post 724 close to one end of the first blocking portion 722 is provided with an opening 7243, the opening 7243 is communicated with the through hole 7242, the opening 7243 is communicated with the exhaust port 714 through a space in the cavity 711, an end face of the guide post 724 facing away from the first blocking portion 722 is provided with an opening communicated with the through hole 7242, the through hole 7242 forms an exhaust passage, the opening 7243 forms an air inlet of the exhaust passage, when the first blocking portion 722 is in sealing fit with the exhaust port 714, the guide post 724 completely extends into the guide hole 7151, the opening 7243 enters the guide hole 7151 and is sealed by the inner wall of the guide hole 7151, namely, the air inlet of the through hole 7242 is sealed, and oil leakage can be effectively avoided.

It should be noted that the exhaust passage connected to the exhaust port between the guide post and the guide hole may be arranged in other manners, and this embodiment is not limited thereto.

As shown in fig. 3, in order to increase the sealing performance when the floating valve spool 72 is matched with the exhaust port 714 and the oil outlet 713, the first blocking portion 722 is provided with a first conical structure, the side wall of the exhaust port 714 has a first conical surface matched with the outer shape of the first conical structure, when the first conical structure is completely matched with the first conical surface, the exhaust port 714 is closed, and the first conical structure is matched with the first conical surface through an inclined surface, so that the sealing performance is better, or the second blocking portion 723 is provided with a second conical structure, the side wall of the oil outlet 713 has a second conical surface matched with the outer shape of the second conical structure, when the second conical structure is completely matched with the second conical surface, the oil outlet 713 is closed, and the second conical structure is matched with the second conical surface through an inclined surface, so that the sealing performance is better; alternatively, the first blocking portion 722 is provided with a first conical structure, the side wall of the exhaust port 714 has a first conical surface matching with the external shape of the first conical structure, meanwhile, the second blocking portion 723 is provided with a second conical structure, and the side wall of the oil outlet 713 has a second conical surface matching with the external shape of the second conical structure, so that the sealing performance of the floating valve spool 72 matching with the exhaust port 714 and the oil outlet 713 is improved.

Specifically, as shown in fig. 1, in order to further increase the sealing performance when the floating valve element 72 is engaged with the exhaust port 714 and the oil outlet 713, the first sealing ring 73 may be sleeved on the peripheral side of the first blocking portion 722, the second sealing ring 74 may be sleeved on the peripheral side of the second blocking portion 723, or the first sealing ring 73 may be sleeved on the peripheral side of the first blocking portion 722, and the second sealing ring 74 may be sleeved on the peripheral side of the second blocking portion 723. The first sealing ring 73 and the second sealing ring 74 can effectively increase the sealing performance, and the sealing performance of the floating valve core 72 when being matched with the exhaust port 714 and the oil outlet 713 can be improved.

Specifically, an annular seal groove is formed in the periphery of the first blocking portion 722, the first seal ring 73 is sleeved in the annular seal groove, stability is good, an annular seal groove is formed in the periphery of the second blocking portion 723, and the second seal ring 74 is sleeved in the annular seal groove, so that installation stability of the second seal ring 74 is guaranteed.

In specific implementation, the outer side of the top wall of the shell 71 is connected with the oil-gas separator 8 communicated with the exhaust port 714, the oil-gas separator 8 can be specifically connected to the top end of the guide hole 7151, exhaust gas can be subjected to oil-gas separation, separated fuel oil is recycled, and waste of the fuel oil is avoided. And specifically, an oil outlet of the oil-gas separator is also connected with a single oil storage container, or the oil outlet of the oil-gas separator is directly connected with an oil tank of the engine through a pipeline.

Based on the same design concept, the present invention further provides an engine, which may be a diesel engine, specifically, as shown in fig. 12, the engine includes an oil tank 1, an oil inlet passage, an oil return passage, an oil injector 6 and any one of the fuel pipeline exhaust devices 7 as in the above embodiments, the oil injector has an oil inlet, an oil nozzle and an oil return port, the oil return port is an outlet for discharging low-pressure oil, the oil inlet of the oil injector is connected with the oil tank through the oil inlet passage, the oil return port of the oil injector is connected with the oil inlet of the oil tank or the oil inlet passage through the oil return passage, the oil pressure in the oil inlet passage can be gradually increased, high-pressure oil is sprayed out from the oil nozzle after reaching the oil injector, the remaining oil which has not been sprayed out can become low-pressure oil to be discharged from the oil return port, and returns to the oil tank through the oil return passage or reenters the oil inlet passage, wherein the fuel pipeline exhaust device is connected in the oil return passage, and the oil inlet of the fuel pipeline exhaust device is connected with the oil return port of the oil injector, and the oil outlet of the fuel pipeline exhaust device is connected with the oil inlet of the oil tank or the oil inlet passage, so that the oil way arrangement of the diesel engine is simplified. The fuel pipeline exhaust device can automatically exhaust air in an oil return pipeline of an engine without manual operation, so that the normal operation of the engine is ensured, the engine is started for the first time, the oil return pipeline is automatically closed when the oil return pipeline is empty, an oil transfer pump cannot suck air, and the normal starting is not influenced.

Specifically, as shown in fig. 12, the engine further includes a fuel coarse filter 2, a fuel delivery pump 3, a fuel fine filter 4 and a high-pressure fuel pump 5 which are arranged in the fuel inlet passage, and the fuel coarse filter 2, the fuel delivery pump 3, the fuel fine filter 4 and the high-pressure fuel pump 5 are sequentially connected between the fuel tank 1 and the fuel injector 6, and the fuel fine filter 4 has an air bleed hole besides an oil inlet and an oil outlet which are connected in the fuel inlet passage, the air bleed hole of the fuel fine filter is connected to an oil inlet of the fuel pipeline exhaust device 7 through a pipeline, the high-pressure fuel pump 5 has an oil return port for discharging overflowed oil besides the oil inlet and the oil outlet which are connected in the fuel inlet passage, and the oil return port of the high-pressure fuel pump is connected to the oil inlet of the fuel pipeline exhaust device 7 through a pipeline; an oil outlet of the fuel pipeline exhaust device 7 is connected with an oil inlet of the oil tank 1 or the fuel strainer 2 through a first pipeline, a heat exchanger 9 is arranged in the first pipeline, the heat exchanger 9 can cool fuel oil discharged from the oil outlet of the fuel pipeline exhaust device, the fuel oil is enabled to return to an oil inlet passage to be normally used, normal operation of an engine is guaranteed, the engine is started for the first time, when the oil return pipeline is empty, the oil return pipeline is automatically closed, an oil transfer pump cannot suck air, and normal starting is not affected.

It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (11)

1. A fuel line venting device, comprising: the valve comprises a shell and a floating valve core positioned in the shell;

a cavity for containing fuel oil is formed in the shell, an oil inlet communicated with the cavity is formed in the side wall of the shell, an exhaust port communicated with the cavity is formed in the top wall of the shell, the exhaust port is far away from the liquid level of the fuel oil in the cavity, and an oil outlet communicated with the cavity is formed in the bottom wall of the shell;

the floating valve core comprises a valve core main body, the valve core main body is movably arranged in the cavity along the direction that the bottom wall of the shell points to the top wall of the shell, the valve core main body is used for floating on fuel oil in the cavity, one side, facing the top wall of the shell, of the valve core main body is provided with a first plugging portion used for plugging the exhaust port, and one side, facing the bottom wall of the shell, of the valve core main body is provided with a second plugging portion used for plugging the oil outlet.

2. The fuel line venting device of claim 1, wherein a clearance is provided between the floating spool and the bottom wall of the housing when the second blocking portion is in sealing engagement with the outlet port.

3. The fuel line vent apparatus of claim 1, wherein a guide portion is provided on an outer side of a top wall of the housing, the guide portion being opposed to the vent port, the guide portion having a guide hole penetrating therethrough in a direction perpendicular to the top wall, the guide hole being opposed to and in communication with the vent port; one side of the first plugging portion, which is far away from the valve core main body, is connected with a guide post, the guide post is in sliding fit with the guide hole, an exhaust passage is formed between the guide hole and the guide post, the exhaust passage is communicated with the exhaust port, and an air inlet of the exhaust passage is connected with the exhaust port.

4. The fuel pipeline exhaust device as claimed in claim 3, wherein the inner wall of the guide hole is provided with at least one strip-shaped vent groove extending along the extension direction of the axis of the guide hole, the vent groove is communicated with the exhaust port, and the vent groove forms the exhaust channel.

5. The fuel pipeline exhaust device as claimed in claim 3, wherein the guide post is provided at an outer side thereof with a strip-shaped recess extending in an extending direction of an axial lead of the guide post, the recess communicating with the exhaust port, the recess constituting the exhaust passage; or,

have in the guide post along the extending direction of its axial lead and run through the through-hole of self, the guide post is close to the tip of the one end of first shutoff portion has the trompil, the trompil with the through-hole intercommunication, just the trompil with the gas vent passes through space intercommunication in the cavity, the terminal surface that the guide post deviates from first shutoff portion has the opening with the through-hole intercommunication, the through-hole constitutes exhaust passage.

6. The fuel line venting device of claim 1, wherein the first blocking portion has a first conical configuration, the side wall of the vent port has a first conical surface that mates with the profile of the first conical configuration, and the vent port is closed when the first conical configuration is fully mated with the first conical surface; and/or the presence of a gas in the gas,

the second blocking part is provided with a second conical structure, the side wall of the oil outlet is provided with a second conical surface matched with the shape of the second conical structure, and when the second conical structure is completely matched with the second conical surface, the oil outlet is closed.

7. The fuel pipeline exhaust device as claimed in claim 1, wherein a first sealing ring is sleeved on the peripheral side of the first blocking part, and/or a second sealing ring is sleeved on the peripheral side of the second blocking part.

8. The fuel line venting device of claim 1, wherein the valve spool body has a cavity structure therein.

9. The fuel pipeline exhaust device as claimed in claim 1, wherein an oil-gas separator communicated with the exhaust port is connected to the outer side of the top wall of the housing.

10. An engine, characterized in that, including oil tank, oil feed route, oil return route, sprayer and according to any claim 1-9 the fuel pipeline exhaust apparatus, the oil inlet of sprayer pass through the oil feed route with the oil tank is connected, the oil return mouth of sprayer pass through the oil return route with the oil tank or the oil inlet of oil feed route is connected, wherein, the fuel pipeline exhaust apparatus connect in the oil return route, and the oil inlet of fuel pipeline exhaust apparatus with the oil return mouth of sprayer is connected, the oil-out of fuel pipeline exhaust apparatus with the oil inlet of oil tank or oil feed route is connected.

11. The engine of claim 10, further comprising a fuel strainer, a fuel delivery pump, a fuel fine filter and a high-pressure fuel pump disposed in the fuel inlet passage, and the fuel strainer, the fuel delivery pump, the fuel fine filter and the high-pressure fuel pump are sequentially connected between the fuel tank and the fuel injector;

an oil outlet of the fuel pipeline exhaust device is connected with an oil inlet of the oil tank or the oil transfer pump through a first pipeline, and a heat exchanger is arranged in the first pipeline.

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