CN116278728A - Liquid fuel recovery system and vehicle with same - Google Patents

Abstract

The invention provides a liquid fuel recovery system and a vehicle with the same, comprising: the oil tank is internally provided with an oil filling limit valve and a gravity valve, the gravity valve is provided with a first exhaust port, and the gravity valve is communicated with an oil storage space of the oil tank; the first air inlet of the first-stage oil-gas separator is communicated with the oil filling limiting valve, the first-stage oil-gas separator is provided with a second air outlet, the second-stage oil-gas separator is positioned in the oil tank, the second-stage oil-gas separator is provided with a second air inlet, a third air inlet and a third air outlet, the second air inlet is communicated with the second air outlet, the third air inlet is communicated with the first air outlet, the third air outlet is communicated with the activated carbon tank, and the second air outlet and the second air inlet are arranged in a height difference in the height direction of the oil tank. The oil-gas separators are all arranged in the oil tank, so that the leakage of the fuel oil is avoided, and after the liquid fuel oil in the first-stage oil-gas separator enters the second-stage oil-gas separator, the secondary oil-gas separation is performed, so that the liquid fuel oil is prevented from entering the activated carbon tank.

Description

Liquid fuel recovery system and vehicle with same

Technical Field

The invention relates to the technical field of vehicle fuel, in particular to a liquid fuel recycling system and a vehicle with the same.

Background

In order to reduce the pollution of harmful emissions of automobiles to the atmosphere, fuel vapor is not directly discharged into the atmosphere, but flows into the activated carbon tank, and the activated carbon in the activated carbon tank can effectively adsorb the fuel vapor, so that the fuel evaporation emission value is effectively reduced. The most important factor causing the reduction of the working capacity of the carbon tank is that liquid fuel enters the active carbon tank, the liquid fuel enters the active carbon tank to cause irreversible reduction of the working capacity of active carbon powder, and if the liquid fuel enters the active carbon tank, the reduction of the working capacity of the active carbon tank is more than 10 percent, the fuel evaporation emission value of the whole vehicle exceeds the standard, and meanwhile, the risk of leakage of fuel vapor is increased, and the risk of fire is also increased. If a large amount of oil is filled in the activated carbon tank, liquid fuel also has the risk of entering the engine, and if the liquid fuel enters the engine, the engine can work unstably and even stall.

At present, two valves are usually adopted in the oil tank, one is an oil filling limit valve (FLVV valve), the other is a gravity valve (GVV valve), the oil filling limit valve (FLVV valve) is a normally open valve, when the oil filling amount reaches a rated volume, the valve is closed, the oil filling amount can be effectively controlled, the gravity valve (GVV valve) is a pressure opening valve, the closing height is higher than the oil filling limit valve (FLVvalve), the normal respiration of the oil tank under the closed state of the FLVV valve can be ensured, and the following four methods for preventing liquid fuel from entering the activated carbon tank are adopted:

first, the tank only has the FLVV valve and the GVV valve, and the risk that liquid fuel generated by dynamic leakage of the valve enters the active carbon tank is great due to the lack of the oil-gas separator structure.

Secondly, the oil tank adopts a valve overhead oil-gas separator structure, namely, an overhead oil-gas separation structure is integrated on the FLVV valve, a single-stage oil-gas separator is adopted, separation is incomplete, and when the oil quantity in the oil tank is large and a refueling limit valve (FLVV valve) is closed, liquid fuel in the oil-gas separator cannot flow back to the oil tank, so that the risk of flowing into an activated carbon tank exists.

Thirdly, the oil tank adopts a built-in independent oil-gas separator structure, and the arrangement position is usually low due to the limitation of space, so that the problem that liquid fuel entering the oil-gas separator cannot flow back exists, and the independent oil-gas separator structure is also usually unsatisfactory in separation effect.

Fourthly, an external oil-gas separator structure is adopted, or the arrangement position of the external oil-gas separator structure arranged on the oil tank or near the oil filling pipe is generally higher, and the liquid fuel backflow effect is better, but because the oil-gas separator is external, on one hand, space arrangement is difficult, and meanwhile, the oil-gas separator is external, the evaporation emission amount can be increased, and the evaporation emission value is easy to exceed the standard.

The valve in the oil tank and the arrangement mode of the oil-gas separator have risks of flowing liquid fuel to the activated carbon tank or leaking fuel steam.

Disclosure of Invention

The invention mainly aims to provide a liquid fuel recovery system and a vehicle with the same, which are used for solving the technical problem that liquid fuel flows to an activated carbon tank or fuel steam leaks in the arrangement mode of a valve and an oil-gas separator in an oil tank in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a liquid fuel recovery system comprising: the oil tank is internally provided with an oil filling limit valve and a gravity valve, the gravity valve is provided with a first exhaust port, and the gravity valve is communicated with an oil storage space of the oil tank; the first air inlet of the first oil-gas separator is communicated with the oil filling limit valve, and the first oil-gas separator is provided with a second air outlet; the second-stage oil-gas separator is positioned in the oil tank, the second-stage oil-gas separator is provided with a second air inlet, a third air inlet and a third air outlet, the second air inlet is communicated with the second air outlet, the third air inlet is communicated with the first air outlet, the third air outlet is communicated with the activated carbon tank, and the second air outlet and the second air inlet are arranged in a height difference manner in the height direction of the oil tank.

Further, at least part of the liquid fuel flowing into the secondary oil-gas separator flows back to the oil tank under the action of gravity or negative pressure.

Further, the height of the second exhaust port is lower than that of the second air inlet in the height direction of the oil tank, and liquid fuel flowing into the secondary oil-gas separator flows back to the oil tank through the second exhaust port.

Further, the third air inlet is positioned at the bottom of the second-stage oil-gas separator, an extending pipe extending vertically downwards is arranged at the third air inlet and is communicated with the first air outlet, and liquid fuel in the second-stage oil-gas separator flows back to the oil tank through the first air outlet and the gravity valve in sequence.

Further, a one-way valve is arranged at the bottom of the secondary oil-gas separator, and liquid fuel flowing into the secondary oil-gas separator flows back to the oil tank through the one-way valve.

Further, the check valves have at least two, and the at least two check valves are disposed in series in the height direction of the tank.

Further, a plurality of first baffles are arranged in the cavity of the first-stage oil-gas separator, gaps are reserved between the first baffles and the inner top wall of the first-stage oil-gas separator, and at least one of the first baffles is arranged around the second exhaust port.

Further, a plurality of second baffles are arranged in the cavity of the secondary oil-gas separator, gaps are reserved between the second baffles and the inner top wall of the secondary oil-gas separator, and at least one of the second baffles is arranged around the third exhaust port.

Further, the difference between the closed position of the fuel filling limit valve and the lower edge surface of the second air outlet in the height direction of the fuel tank is more than 30mm.

According to another aspect of the present invention there is provided a vehicle comprising a liquid fuel recovery system as described above.

By applying the technical scheme of the invention, the two-stage oil-gas separator is arranged in the oil tank, and fuel steam in the first-stage oil-gas separator and the gravity valve enters the active carbon tank after passing through the second-stage oil-gas separator, so that the leakage of fuel is avoided. When the liquid fuel in the first-stage oil-gas separator enters the second-stage oil-gas separator along with fuel steam, the second-stage oil-gas separator performs secondary oil-gas separation, so that the liquid fuel is left in the second-stage oil-gas separator or flows back into the oil tank, and the reduction of the working capacity of the liquid fuel caused by the liquid fuel entering the active carbon tank is avoided.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a liquid fuel recovery system according to the present invention;

fig. 2 shows a schematic structural view of a second embodiment of a liquid fuel recovery system according to the invention;

FIG. 3 is a schematic view showing the structure of the check valve in the present invention;

FIG. 4 shows a schematic diagram of the internal structure of the primary oil-gas separator of the present invention;

FIG. 5 shows a schematic diagram of the internal structure of the secondary oil-gas separator of the present invention;

FIG. 6 shows a schematic diagram of the integration relationship of the primary oil-gas separator and the oil filling limit valve in the invention.

Wherein the above figures include the following reference numerals:

10. an oil tank;

20. a fueling limit valve; 21. a guide post; 22. the boss is clamped; 23. a clamping groove; 24. a float; 25. an oil inlet window; 26. a seal ring; 27. an air outlet; 28. a valve inner housing; 29. a valve housing; 210. sealing cover;

30. a gravity valve; 31. a first exhaust port;

40. a first-stage oil-gas separator; 41. a second exhaust port; 42. a first baffle; 43. a first air inlet;

50. a second-stage oil-gas separator; 51. a second air inlet; 52. a third air inlet; 53. a third exhaust port; 54. an extension tube; 55. a second baffle;

60. an activated carbon canister; 61. an adsorption pipe orifice; 62. an atmospheric orifice; 63. desorbing the pipe orifice;

70. a one-way valve; 71. a first-stage one-way valve; 72. a two-stage one-way valve; 73. a first-stage baffle; 74. a second-stage baffle;

80. full oil level;

90. a first pipeline; 91. a second pipeline; 92. and a third pipeline.

Detailed Description

It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

Referring to fig. 1-6, a liquid fuel recovery system is provided according to an embodiment of the present application.

Specifically, the liquid fuel recovery system includes: the oil tank 10, the primary oil separator 40 and the secondary oil separator 50. The fuel tank 10 is internally provided with a fuel filling limit valve 20 and a gravity valve 30, the gravity valve 30 is provided with a first exhaust port 31, and the gravity valve 30 is communicated with a fuel storage space of the fuel tank 10. The first-stage oil-gas separator 40 is located in the oil tank 10, a first air inlet 43 of the first-stage oil-gas separator 40 is communicated with the oil filling limit valve 20, and a second air outlet 41 is formed in the first-stage oil-gas separator 40. The secondary oil-gas separator 50 is located in the oil tank 10, the secondary oil-gas separator 50 is provided with a second air inlet 51, a third air inlet 52 and a third air outlet 53, the second air inlet 51 is communicated with the second air outlet 41, the third air inlet 52 is communicated with the first air outlet 31, the third air outlet 53 is communicated with the charcoal canister 60, and the second air outlet 41 and the second air inlet 51 are arranged with a height difference in the height direction of the oil tank 10.

The fuel filling limit valve 20 is a normally open valve, and when the fuel filling amount reaches the rated volume, the valve is closed, so that the fuel filling amount can be effectively controlled. The gravity valve 30 is a pressure-opening valve that closes at a height higher than that of the fuel tank limit valve 20, i.e., a height difference between the gravity valve 30 and the full level 80, to ensure proper breathing of the fuel tank 10 in the closed state of the fuel tank limit valve 20.

In the embodiment of the application, a two-stage oil-gas separator is arranged in the oil tank 10, and fuel steam in the first-stage oil-gas separator 40 and the gravity valve 30 enters the active carbon tank after passing through the second-stage oil-gas separator 50, so that the leakage of fuel is avoided. After the liquid fuel in the first-stage oil-gas separator 40 enters the second-stage oil-gas separator 50 along with the fuel steam, the second-stage oil-gas separator 50 performs secondary oil-gas separation, so that the liquid fuel is left in the second-stage oil-gas separator 50 or flows back into the oil tank 10, and the working capacity of the liquid fuel is prevented from being reduced due to the fact that the liquid fuel enters the activated carbon tank 60.

In one exemplary embodiment of the present application, the secondary vapor separator 50 is positioned between the primary vapor separator 40 and the gravity valve 30 to facilitate the placement of the connecting lines. Specifically, the second air outlet 41 of the primary oil-gas separator 40 is communicated with the second air inlet 51 of the secondary separator through a first pipeline 90, the first air outlet 31 of the gravity valve 30 is communicated with the third air inlet 52 of the secondary oil-gas separator 50 through a second pipeline 91, and the third air outlet 53 of the secondary oil-gas separator 50 is communicated with the charcoal canister 60 through a third pipeline 92.

Further, an adsorption nozzle 61, an atmospheric nozzle 62 and a desorption nozzle 63 are provided on the canister, wherein the third exhaust port 53 of the secondary oil separator 50 communicates with the adsorption nozzle 61 of the canister 60 through a third pipe 92. When the engine works, fuel vapor adsorbed in the active carbon tank flows to the engine through the desorption pipe orifice 63 to be burnt, fresh air flows into the active carbon tank through the atmosphere pipe orifice 62 to perform pressure compensation, so that the pressure balance in the active carbon tank is ensured, and the desorbed active carbon tank can continuously adsorb the fuel vapor, so that the operation is repeated.

In one exemplary embodiment of the present application, the liquid fuel that enters the secondary vapor separator 50 through the primary vapor separator 40 may remain in the secondary vapor separator 50.

In another exemplary embodiment of the present application, at least a portion of the liquid fuel flowing into the secondary vapor separator 50 is returned to the fuel tank 10 under gravity or negative pressure. The liquid fuel is returned to the fuel tank 10, so that the liquid fuel is prevented from exceeding the third air outlet 53 of the secondary air-fuel separator 50 due to continuous accumulation, or is splashed out of the third air outlet 53 due to vehicle shake, and finally, the liquid fuel is caused to enter the charcoal canister 60.

In one specific exemplary embodiment of the present application, as shown in fig. 1, the height of the second air outlet 41 is lower than the height of the second air inlet 51 in the height direction of the fuel tank 10, and the liquid fuel flowing into the secondary air separator 50 flows back to the fuel tank 10 through the second air outlet 41. Under the action of gravity, part of the liquid fuel entering the first pipeline 90 can flow back to the first oil-gas separator, so that the liquid fuel in the first pipeline 90 is reduced to enter the second-stage oil-gas separator 50, and more separation space is reserved in the second-stage oil-gas separator 50. The liquid fuel entering the secondary oil-gas separator 50 can flow back into the primary oil-gas separator 40 through the second air inlet 51 and the first pipeline 90 due to the height difference and the gravity, and in the running process of the vehicle, the air outlet 27 of the oil-filling limit valve 20 is opened due to the consumption of the liquid fuel, and the liquid fuel in the first oil-gas separator flows back to the oil tank 10 through the oil-filling limit valve 20.

It should be noted that, the arrangement space in the oil tank 10 is relatively sufficient, and the position of the secondary oil-gas separator 50 is higher than the position of the primary oil-gas separator 40 in the height direction of the oil tank 10, so that the design requirement that the height of the second air outlet 41 is lower than the height of the second air inlet 51 in the height direction of the oil tank 10 can be satisfied.

In another specific exemplary embodiment of the present application, as shown in fig. 2, the third air inlet 52 is located at the bottom of the secondary oil-gas separator 50, and an extension pipe 54 extending vertically downward is provided at the third air inlet 52, where the extension pipe 54 is communicated with the first air outlet 31, and the liquid fuel in the secondary oil-gas separator 50 flows back to the oil tank 10 through the first air outlet 31 and the gravity valve 30 in sequence. Wherein, the pipe diameters of the extension pipe 54 and the second pipeline 91 are not larger than 5mm, so as to ensure that the extension pipe 54 is filled with a small amount of liquid fuel in the secondary oil-gas separator 50; after the extension pipe 54 is filled, the liquid fuel is gradually pressed into the second pipeline 91 under the action of negative pressure, and the liquid fuel is kept in a continuous state in the second pipeline 91 because the pipe diameter of the second pipeline 91 is smaller; the gravity valve 30 is always communicated with the oil storage space of the oil tank 10, so that the liquid fuel in the second pipeline 91 flows back into the oil tank 10 through the gravity valve 30.

It should be noted that the space for arrangement in the oil tank 10 is limited, and in the height direction of the oil tank 10, the position of the secondary gas-oil separator 50 is lower than the position of the primary gas-oil separator 40, and in the height direction of the oil tank 10, it is difficult to ensure that the height of the second gas inlet 51 is higher than the height of the second gas outlet 41.

Further, in the embodiment shown in fig. 1 and 2, the bottom of the secondary air-fuel separator 50 may be provided with a check valve 70, and the liquid fuel flowing into the secondary air-fuel separator 50 flows back to the fuel tank 10 through the check valve 70. The arrangement of the check valve 70 increases the return path of the liquid fuel and is simple.

Specifically, in the embodiment shown in fig. 1, the check valve 70 is added, when the vehicle is inclined or jolts severely, the liquid fuel in the primary oil-gas separator 40 may flow into the secondary oil-gas separator 50 through the first pipeline 90, and the liquid fuel flowing into the secondary oil-gas separator 50 may flow back to the oil tank 10 through the check valve 70.

It should be noted that, in the embodiment shown in fig. 2, the full oil level 80 is higher than the position of the check valve 70, that is, the check valve 70 is submerged by the liquid fuel, the liquid fuel in the secondary oil-gas separator 50 cannot flow back to the oil tank 10 through the check valve 70, at this time, the liquid fuel in the secondary oil-gas separator 50 fills the extension pipe 54, and under the action of negative pressure, the liquid fuel is gradually pressed into the second pipeline 91, so that the liquid fuel flows back to the oil tank 10 through the gravity valve 30. The full oil level 80 refers to the level of the oil tank 10 after filling.

Further, the check valve 70 has at least two, and at least two check valves 70 are disposed in series in the height direction of the tank 10. As shown in fig. 3 in particular, the check valve 70 includes: the one-stage check valve 71, the second-stage check valve 72, the one-stage baffle 73 and the second-stage baffle 74, the one-stage baffle 73 is located under the one-stage check valve 71, the second-stage baffle 74 is located under the second-stage check valve 72, the one-stage baffle 73 and the second-stage baffle 74 play a limiting and supporting role, and sealing caused by transition deformation of the check valve is prevented from being loose. The first-stage baffle 73 and the second-stage baffle 74 are respectively provided with a through hole so as to ensure that the liquid fuel in the second-stage oil-gas separator 50 smoothly flows out. When the oil tank 10 shakes, the valve core of the check valve may incline, a small amount of liquid fuel entering the secondary oil-gas separator 50 through the secondary check valve 72 may be blocked by the primary check valve 71, and the probability of liquid fuel entering the secondary oil-gas separator 50 through the two-stage check valve 70 is very low.

As shown in fig. 4, a plurality of first baffles 42 are provided in the cavity of the primary oil separator 40, gaps are left between the first baffles 42 and the inner top wall of the primary oil separator 40, at least one of the plurality of first baffles 42 is provided around the second exhaust port 41, and fuel vapor flows out from the second exhaust port 41 through the gaps. Specifically, the first baffle plate 42 has four cylindrical structures, one of the first baffle plates 42 has a U-shaped structure, the first baffle plate 42 with the U-shaped structure is arranged around the second exhaust port 41, the remaining three first baffle plates 42 are arranged around the first air inlet 43 of the first oil-gas separator 40, and an outlet is reserved between two adjacent first baffle plates 42, so that splashed liquid fuel can gradually collide and settle. The first baffle plate 42 plays a role in buffering, and after the liquid fuel entering the first-stage oil-gas separator 40 through the first air inlet 43 collides with the first baffle plate 42, the liquid fuel flows downwards to the bottom of the cavity along the first baffle plate 42, so that the liquid fuel is prevented from splashing from the second air outlet 41.

The shape of the first-stage oil separator 40 is not limited, and may be rectangular, polygonal, or the like. The shape and number of the first barrier 42 are not limited as long as the collision buffer function is provided.

As shown in fig. 5, a plurality of second baffles 55 are arranged in the cavity of the secondary oil-gas separator 50, gaps are reserved between the second baffles 55 and the inner top wall of the secondary oil-gas separator 50, at least one of the second baffles 55 is arranged around the third exhaust port 53, and fuel vapor flows out of the third exhaust port 53 through the gaps. Specifically, the second baffle plate 55 has four rectangular structures, one of the second baffle plates 55 has a U-shaped structure, the second baffle plate 55 with the U-shaped structure is arranged around the third exhaust port 53, and the remaining three second baffle plates 55 are arranged at intervals along the length direction of the second oil-gas separator 50, and an outlet is reserved between two adjacent second baffle plates 55, so that splashed liquid fuel can gradually collide and subside. The second baffle plate 55 plays a role in buffering, and after the liquid fuel entering the secondary oil-gas separator 50 collides with the second baffle plate 55, the liquid fuel flows downwards to the bottom of the cavity along the second baffle plate 55, so that the liquid fuel is prevented from splashing out of the third exhaust port 53.

The shape of the first-stage oil separator 40 is not limited, and may be cylindrical, polygonal, or the like. The shape and number of the second barrier 55 are not limited as long as the collision buffer function is provided.

As shown in fig. 6, the primary oil-gas separator 40 is integrated on the top of the oil filling limit valve 20, and the first air inlet 43 of the primary oil-gas separator 40 is disposed opposite to the air outlet 27 of the oil filling limit valve 20. Specifically, the fueling limit valve 20 includes: the oil filling limit valve comprises a valve outer shell 29, a valve inner shell 28, a clamping boss 22, a guide pillar 21, a floater 24, an oil inlet window 25, a sealing ring 26, an air outlet 27 and a sealing cover 210, wherein the valve outer shell 29 and the valve inner shell 28 are sleeved and connected to form a cavity of the oil filling limit valve 20, the valve outer shell 29 is provided with the oil inlet window 25, the oil inlet window 25 is communicated with the cavity of the oil filling limit valve 20, the top of the floater 24 is connected with the sealing cover 210, and the sealing cover 210 is used for sealing the air outlet 27. The primary oil-gas separator 40 is provided with an outwardly extending connecting sleeve, the connecting sleeve is provided with a clamping groove 23, the primary oil-gas separator 40 is sleeved and connected with a valve shell 29 of the oiling limit valve 20 through the connecting sleeve, and the valve shell 29 is clamped and connected with the clamping groove 23 through a clamping boss 22. The periphery of the valve inner shell 28 is provided with a sealing ring 26, the valve inner shell 28 is in sealing connection with a connecting sleeve of the primary oil-gas separator 40 through the sealing ring 26, and the sealing ring 26 is positioned above the oil inlet window 25. The structure of the overhead primary oil-gas separator 40 can realize the real-time backflow of the dynamic leaked fuel oil, and the risk of fuel oil leakage is reduced more effectively.

In the initial stage of refueling, the float 24 is located at the lower part of the refueling limit valve 20 due to gravity, and fuel vapor in the fuel tank 10 flows into the primary gas-oil separator 40 through the fuel inlet window 25, the air outlet 27 and the first air inlet 43 in sequence, and then enters the secondary gas-oil separator 50 through the second air outlet 41. When the liquid level after refueling reaches the lower edge of the oil inlet window 25 of the refueling limit valve 20, liquid fuel can flow into the refueling limit valve 20 from the oil inlet window 25, the float 24 rises along the guide post 21 under the action of buoyancy, when the sealing cover 210 at the top of the float 24 contacts with the inner wall of the refueling limit valve 20 and plugs the air outlet 27, fuel vapor in the oil tank 10 cannot be discharged, the pressure in the oil tank 10 rises rapidly, liquid fuel cannot be continuously added, the refueling gun jumps, the refueling process is finished, and the liquid level in the oil tank 10 just reaches the full oil level 80.

As an alternative embodiment, the primary oil-gas separator 40 and the fueling limiting valve 20 may be non-integrated structures, and in the opened state of the fueling limiting valve 20, it is only required to ensure that the first air inlet 43 of the primary oil-gas separator 40 is communicated with the air outlet 27 of the fueling limiting valve 20.

Further, the difference in height between the closed position of the fuel addition limiting valve 20 and the lower edge surface of the second vent 41 in the height direction of the fuel tank 10 is greater than 30mm. Specifically, as shown in fig. 6, the distance between the full oil level 80 and the lower edge surface of the second exhaust port 41 is H, which is greater than 30mm. That is, the full oil level 80 is maintained at a sufficient level difference from the second exhaust port 41, and the splashing of the liquid fuel from the second exhaust port 41 is reduced.

According to another embodiment of the present application, there is provided a vehicle including a liquid fuel recovery system, the liquid fuel recovery system being the liquid fuel recovery system in the above embodiment.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., mean that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described in general terms in the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the invention.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A liquid fuel recovery system, comprising:

the oil tank (10), the oil tank (10) is internally provided with a refueling limit valve (20) and a gravity valve (30), the gravity valve (30) is provided with a first exhaust port (31), and the gravity valve (30) is communicated with an oil storage space of the oil tank (10);

the first-stage oil-gas separator (40) is positioned in the oil tank (10), a first air inlet (43) of the first-stage oil-gas separator (40) is communicated with the oil filling limit valve (20), and a second air outlet (41) is formed in the first-stage oil-gas separator (40);

the secondary oil-gas separator (50), secondary oil-gas separator (50) are located in oil tank (10), secondary oil-gas separator (50) are equipped with second air inlet (51), third air inlet (52) and third gas vent (53), second air inlet (51) with second gas vent (41) intercommunication, third air inlet (52) with first gas vent (31) intercommunication, third gas vent (53) communicate with charcoal canister (60), second gas vent (41) and second air inlet (51) are in the direction of height of oil tank (10) has the difference in height to set up.

2. The liquid fuel recovery system according to claim 1, wherein at least part of the liquid fuel flowing into the secondary gas-oil separator (50) is returned to the fuel tank (10) by gravity or negative pressure.

3. The liquid fuel recovery system according to claim 2, wherein the second air outlet (41) is lower in height than the second air inlet (51) in the height direction of the fuel tank (10), and the liquid fuel flowing into the secondary air separator (50) flows back to the fuel tank (10) through the second air outlet (41).

4. The liquid fuel recovery system according to claim 2, wherein the third air inlet (52) is located at the bottom of the secondary oil-gas separator (50), an extension pipe (54) extending vertically downwards is arranged at the third air inlet (52), the extension pipe (54) is communicated with the first air outlet (31), and liquid fuel in the secondary oil-gas separator (50) flows back to the fuel tank (10) through the first air outlet (31) and the gravity valve (30) in sequence.

5. The liquid fuel recovery system according to any one of claims 1 to 4, wherein a check valve (70) is provided at the bottom of the secondary gas-oil separator (50), and the liquid fuel flowing into the secondary gas-oil separator (50) flows back to the fuel tank (10) through the check valve (70).

6. The liquid fuel recovery system according to claim 5, wherein the check valve (70) has at least two, at least two of the check valves (70) being disposed in series in a height direction of the fuel tank (10).

7. The liquid fuel recovery system according to claim 1, wherein a plurality of first baffles (42) are arranged in the cavity of the primary oil-gas separator (40), gaps are reserved between the first baffles (42) and the inner top wall of the primary oil-gas separator (40), and at least one of the first baffles (42) is arranged around the second exhaust port (41).

8. The liquid fuel recovery system according to claim 1, wherein a plurality of second baffles (55) are arranged in the cavity of the secondary oil-gas separator (50), gaps are reserved between the second baffles (55) and the inner top wall of the secondary oil-gas separator (50), and at least one of the second baffles (55) is arranged around the third exhaust port (53).

9. The liquid fuel recovery system according to claim 1, characterized in that the difference in height between the closed position of the refuelling limiting valve (20) and the lower edge surface of the second vent (41) in the height direction of the fuel tank (10) is greater than 30mm.

10. A vehicle comprising a liquid fuel recovery system, characterized in that the liquid fuel recovery system is a liquid fuel recovery system according to any one of claims 1-9.

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