CN217327519U

CN217327519U - Breather valve and mechanical seal fuel oil system ventilate

Info

Publication number: CN217327519U
Application number: CN202221347467.XU
Authority: CN
Inventors: 李卫民; 雷瀚; 段文强; 冉林
Original assignee: Tengsuo Auto Parts Huangshi Co ltd
Current assignee: Tengsuo Auto Parts Huangshi Co ltd
Priority date: 2022-05-31
Filing date: 2022-05-31
Publication date: 2022-08-30
Anticipated expiration: 2032-05-31

Abstract

The application relates to a ventilation breather valve and a mechanical seal fuel oil system, belonging to the technical field of commercial vehicle fuel tanks, comprising a valve body, a valve seat and a valve cover, wherein the valve seat is provided with a top opening and is sealed at the periphery, the valve cover is positioned at the top of the valve seat and seals the top opening of the valve seat, a guide pipe column extending vertically and upwards is arranged in the valve seat, and the valve cover is provided with an exhaust hole communicated with the guide pipe column; and the valve core comprises a plug positioned in the guide pipe column and a compression spring for driving the plug to seal the exhaust hole, and when the turning angle of the valve body is smaller than a set value, the plug enables the compression spring to compress so as to open the exhaust hole. This application has guaranteed that the oil tank is under normal operating mode, and the breather valve of ventilating communicates oil tank and atmosphere to make the oil tank can normally breathe, when the vehicle turned on one's side, the breather valve of ventilating can self-closing, prevents that the oil tank fuel from leaking, has improved the security performance.

Description

Breather valve and mechanical seal fuel oil system ventilate

Technical Field

The application relates to the technical field of fuel tanks of commercial vehicles, in particular to a ventilation breather valve and a mechanical seal fuel system.

Background

Light-duty commercial gasoline car ORVR technical route on the market at present adopts the mechanical seal design scheme more, realizes through the FLVV valve that refuel the in-process with the fuel steam leading-in refuel the volume in controlling the oil tank simultaneously, has realized breathing under the static and dynamic road conditions of vehicle through the ROV valve, prevents that fluid from spilling the oil tank under the circumstances of overturning.

Normally, the FLVV valve is in an open state, fuel steam is led into the carbon tank in the refueling process, pollutant discharge is controlled, and when the refueling volume liquid level reaches the FLVV valve closing liquid level, the FLVV valve enables the float to move upwards to block the vent hole by utilizing the buoyancy principle so as to close the breathing hole. Pressure in the oil tank rises, and fluid twines the filler tube inner wall, submergence nozzle trigger hole, causes the nozzle to jump the rifle.

The ROV valve realizes that the breathing port is closed through utilizing buoyancy principle to design a float, and the ROV valve guarantees to ventilate under normal condition, plays the respiration under the static and dynamic condition of vehicle, and when the condition of overturning, the float of ROV valve closes the breathing port to prevent that oil from leaking the oil tank.

However, in the actual use process of the fuel system, the FLVV valve cannot play a role in controlling the refueling volume of the fuel tank, but is easily closed in advance in the refueling process, so that fuel vapor in the fuel tank cannot be introduced into the carbon tank in the refueling process, the pressure in the fuel tank rises, the fuel tank is abnormally deformed, and the function of the fuel tank fails in a severe case.

After the FLVV valve is closed abnormally, when oil is added and a gun is pulled out, potential safety hazards such as personnel injury or fire hazard can be caused by reverse spraying, reverse surge and splashing of oil liquid due to overlarge pressure in an oil tank.

Disclosure of Invention

The embodiment of the application provides a breather valve and mechanical seal fuel oil system to FLVV valve closes in advance easily among the solution correlation technique, leads to the unable leading-in carbon canister of fuel steam in the fuel tank among the refueling process, makes the pressure rise in the fuel tank, leads to the oil tank to take place abnormal deformation, can make the problem of oil tank functional failure when serious.

A first aspect of embodiments of the present application provides a ventilation breather valve, comprising:

the valve body comprises a valve seat with a top opening and a periphery closed, and a valve cover which is positioned at the top of the valve seat and closes the top opening of the valve seat, wherein a guide pipe column which extends vertically and upwards is arranged in the valve seat, and the valve cover is provided with an exhaust hole communicated with the guide pipe column;

and the valve core comprises a plug positioned in the guide pipe column and a compression spring for driving the plug to seal the vent hole, and when the turning angle of the valve body is smaller than a set value, the plug compresses the compression spring to open the vent hole.

In some embodiments: the bottom of the valve seat is provided with an air inlet, the side wall of the guide pipe column is provided with a plurality of air vents, and the air vents are circumferentially arranged along the pipe wall of the guide pipe column.

In some embodiments: the gravity of the plug is larger than the elastic force of the compression spring, and when the turning angle of the valve body is larger than a set value, the elastic force of the compression spring is larger than the gravity component of the plug.

In some embodiments: the exhaust hole is of a conical structure with a small upper caliber and a large lower caliber, the plug is of a spherical structure, and the maximum caliber of the exhaust hole is smaller than the diameter of the plug.

In some embodiments: the exhaust hole is of a conical structure with a small upper caliber and a large lower caliber, the plug is of a cylindrical structure, and the maximum caliber of the exhaust hole is smaller than the diameter of the plug.

In some embodiments: the exhaust hole is of a conical structure with a small upper caliber and a large lower caliber, the plug is of a circular truncated cone-shaped structure with a small upper diameter and a large lower diameter, and the maximum caliber of the exhaust hole is smaller than the maximum diameter of the plug.

In some embodiments: when the turning angle of the valve body is smaller than 60 degrees, the plug compresses the compression spring to open the exhaust hole.

In some embodiments: the valve comprises a valve seat, a valve cover and a valve seat, wherein the valve cover is provided with a plurality of valve seats, the valve seat is provided with a plurality of valve seats, the valve seats are arranged in the valve seats, the valve covers are provided with buckles extending into the valve seats at the periphery, and the side walls of the valve seats are provided with connecting holes connected with the buckles.

In some embodiments: the valve cover is provided with an annular groove connected with the guide pipe column, the annular groove is located around the exhaust hole, and the top of the guide pipe column is located in the annular groove.

A second aspect of an embodiment of the present application provides a mechanically sealed fuel system, comprising the breather valve of any of the above embodiments;

the fuel tank is used for accommodating the ventilation and respiration valve, and the ventilation and respiration valve is fixed on the top surface of the fuel tank;

the fuel tank is provided with a filling pipe extending into the fuel tank, and an oil outlet of the filling pipe is lower than the bottom surface of the ventilation breather valve;

the carbon tank is connected with the ventilation breather valve and is connected with the exhaust hole of the ventilation breather valve through a pipeline.

The beneficial effect that technical scheme that this application provided brought includes:

the embodiment of the application provides a breather valve and mechanical seal fuel oil system ventilates, because the breather valve of ventilating of this application has set up the valve body, this valve body includes the confined disk seat all around of open-top to and be located the top of disk seat and seal its open-top's valve gap, be equipped with the vertical guide pipe post that upwards extends in the disk seat, set up the exhaust hole with the guide pipe post intercommunication on the valve gap. And the valve core comprises a plug positioned in the guide pipe column and a compression spring for driving the plug to seal the exhaust hole, and when the turning angle of the valve body is smaller than a set value, the plug enables the compression spring to contract to open the exhaust hole.

Consequently, the breather valve of ventilating of this application has set up the end cap in guide pipe post, and the drive end cap seals the compression spring in exhaust hole, under the normal condition, the gravity of end cap is greater than compression spring's elasticity, the end cap compresses compression spring to a certain position until the gravity of end cap and compression spring's elasticity reach balanced state, the exhaust hole of breather valve of ventilating this moment is in the open mode, refuel the in-process through the breather valve of ventilating with fuel steam leading-in to the carbon tank, the exhaust hole can not be closed at the in-process of refueling, and the breathing of oil tank has been guaranteed under the static and dynamic road conditions of vehicle.

In a rollover state, when the turnover angle of the ventilation breather valve reaches a set value or more, the elastic force of the compression spring is greater than the gravity component of the plug, the plug is elastically supported by the elastic force of the compression spring, and the vent hole of the valve cover is sealed by the plug, so that the ventilation breather valve reaches a closed state, and oil is prevented from leaking out of the oil tank. This application has guaranteed that the oil tank is under normal operating mode, and the breather valve of ventilating communicates oil tank and atmosphere to make the oil tank can normally breathe, when the vehicle turned on one's side, the breather valve of ventilating can self-closing, prevents that the oil tank fuel from leaking, has improved the security performance.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of a ventilated exhalation valve of a first embodiment of the present application in an open state;

FIG. 2 is a schematic structural view of a ventilated exhalation valve of the first embodiment of the present application in a closed state;

FIG. 3 is a schematic structural view of a ventilated exhalation valve of a second embodiment of the present application in an open state;

FIG. 4 is a schematic structural view of a second embodiment of a ventilated exhalation valve of the present application in a closed state;

FIG. 5 is a schematic structural view of a ventilated exhalation valve of a third embodiment of the present application in an open state;

FIG. 6 is a schematic diagram of a third embodiment of a ventilated exhalation valve of the present application in a closed position;

FIG. 7 is a schematic structural diagram of a mechanically sealed fuel system according to an embodiment of the present disclosure.

Reference numerals:

1. a valve body; 11. a valve seat; 12. a valve cover; 13. guiding the pipe column; 14. an exhaust hole; 15. an annular groove; 16. buckling; 17. connecting holes;

2. a valve core; 21. a compression spring; 22. a plug; 23. an air inlet; 24. a vent hole;

100. a ventilation breather valve; 200. an oil tank; 300. carbon tank, 400, add oil pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The embodiment of the application provides a breather valve and mechanical seal fuel oil system, and it can solve FLVV valve and close in advance easily among the correlation technique, leads to the unable leading-in carbon tank of fuel steam in the fuel tank among the refueling process, makes the pressure rise in the fuel tank, leads to the oil tank to take place abnormal deformation, can make the problem of oil tank functional failure when serious.

Referring to fig. 1 to 6, a first aspect of an embodiment of the present application provides a ventilation breather valve 100, including:

the valve body 1, this valve body 1 include that open-top encloses valve seat 11 all around to and be located the top of valve seat 11 and seal its open-top's valve gap 12, be equipped with vertical upwards extending guide pipe post 13 in valve seat 11, offer the exhaust hole 14 with guide pipe post 13 intercommunication on valve gap 12, exhaust hole 14 is used for providing breathing passage for oil tank 200, with the pressure differential between balanced oil tank 200 and the outside annular.

The valve core 2, the valve core 2 comprises a plug 22 positioned in the guide column 13, and a compression spring 21 driving the plug 22 to close the exhaust hole 14, wherein the compression spring 21 is used for elastically supporting the plug 22 to move up and down in the guide column 13. When the plug 22 moves downwards to the set position, the plug 22 opens the vent hole 14, and when the plug 22 moves upwards to the set position, the plug 22 closes the vent hole 14. When the turning angle of the valve body 1 is smaller than the set value, the choke plug 22 contracts the compression spring 21 to open the exhaust hole 14.

The breather valve 100 of this application embodiment has set up end cap 22 in guide pipe post 13 to and the drive end cap 22 seals the compression spring 21 of exhaust hole 14, under normal conditions, the gravity of end cap 22 is greater than compression spring 21's elasticity, end cap 22 compresses compression spring 21 to a certain position until end cap 22's gravity and compression spring 21's elasticity reach balanced state, the exhaust hole 14 of breather valve 100 is in the open mode this moment, refuel in-process through breather valve 100 with fuel steam leading-in to carbon tank 300, exhaust hole 14 can not closed in refueling in-process, and guaranteed the breathing of oil tank 200 under the static and dynamic road conditions of vehicle.

In a rollover state, when the turning angle of the ventilation breather valve 100 reaches a set value or more, the elastic force of the compression spring 21 is greater than the gravity component of the plug 22, at this time, the elastic force of the compression spring 21 elastically supports the plug 22, and the plug 22 closes the exhaust hole 14 of the valve cover 12, so that the ventilation breather valve 100 is in a closed state, and oil is prevented from leaking out of the oil tank 200. This application has guaranteed that oil tank 200 is under normal operating mode, and breather valve 100 of ventilating communicates oil tank 200 and atmosphere to make oil tank 200 can normally breathe, when the vehicle turned on one's side, breather valve 100 of ventilating can self-closing, prevents that oil tank 200 fuel from leaking, has improved the security performance.

In some alternative embodiments: referring to fig. 1 to 6, in the present embodiment, an air inlet 23 is disposed at the bottom of a valve seat 11 of the ventilation breather valve 100, a plurality of air vents 24 are disposed on a side wall of a guide column 13, and the plurality of air vents 24 are circumferentially arranged along a tube wall of the guide column 13. The air inlet hole 23 is positioned at the bottom of the valve seat 11 to discharge the air in the oil tank into the ventilation breather valve 100, and a plurality of vent holes 24 are opened on the side wall of the guide pipe column 13 to communicate the air inlet hole 23 with the air outlet hole 14, so that the air entering the ventilation breather valve 100 is discharged to the atmosphere from the air inlet hole 23 and the air outlet hole 14.

The gravity of the plug 22 is greater than the elastic force of the compression spring 21, when the turning angle of the valve body 1 is greater than 60 degrees, the elastic force of the compression spring 21 is greater than the gravity component of the plug 22, and the compression spring 21 drives the plug 22 to plug the exhaust hole 14. When the turning angle of the valve body 1 is less than 60 degrees, the plug 22 contracts the compression spring 21 by means of the self gravity to open the exhaust hole 14, so that the ventilation breather valve 100 communicates the oil tank 200 with the atmosphere.

In some alternative embodiments: referring to fig. 1 and 2, in the embodiment of the present invention, a ventilation breather valve is provided, in which a vent hole 14 of the ventilation breather valve 100 is in a conical structure with a small upper caliber and a large lower caliber, a plug 22 is in a spherical structure, the plug 22 is preferably, but not limited to, a steel ball, and the maximum caliber of the vent hole 14 is smaller than the diameter of the plug 22, so that good sealing performance is achieved after the plug 22 contacts with the vent hole 14.

In some alternative embodiments: referring to fig. 3 and 4, in the ventilation breather valve 100, the vent hole 14 has a conical structure with a small upper caliber and a large lower caliber, the plug 22 has a cylindrical structure, and the maximum caliber of the vent hole 14 is smaller than the diameter of the plug 22, so that the plug 22 and the vent hole 14 are in contact to achieve good sealing performance.

In some alternative embodiments: referring to fig. 5 and 6, in the ventilation breather valve 100, the vent hole 14 has a conical structure with a small upper diameter and a large lower diameter, the plug 22 has a truncated cone-shaped structure with a small upper diameter and a large lower diameter, and the maximum diameter of the vent hole 14 is smaller than the maximum diameter of the plug 22, so that the plug 22 and the vent hole 14 are in contact to achieve good sealing performance.

In some alternative embodiments: referring to fig. 1 to 6, in the embodiment of the present invention, a clamping buckle 16 extending into a valve seat 11 is disposed around a valve cover 12 of a ventilation breather valve 100, and a connecting hole 17 connected with the clamping buckle 16 is disposed on a side wall of the valve seat 11. The valve cover 12 is detachably connected with the valve seat 11 through a buckle 16, so that the assembly and the maintenance of the valve cover 12 and the valve seat 11 are facilitated. An annular groove 15 connected with the guide pipe column 13 is formed in the valve cover 12, the annular groove 15 is located on the periphery of the exhaust hole 14, the top of the guide pipe column 13 is located in the annular groove 15, and the annular groove 15 is used for locating the guide pipe column 13, so that the guide pipe column 13 and the exhaust hole 14 are coaxially arranged.

Referring to fig. 7, a second aspect of the embodiment of the present application provides a mechanically sealed fuel system, including the breather valve 100 of any of the above embodiments, and a fuel tank 200 housing the breather valve 100, wherein the breather valve 100 is fixed on the top surface of the fuel tank 200. The fuel tank 200 is provided with a filler tube 400 extending into the fuel tank 200, and the fuel outlet of the filler tube 400 is lower than the bottom surface of the breather valve 100.

When the fluid liquid level in the fuel tank 200 does not reach the height of the ventilation breather valve 100 in the refueling process, and the fluid liquid level reaches the height of the refueling pipe 400, the pressure in the refueling pipe 400 is increased, the fluid is wound on the inner wall of the refueling pipe 400, and the fuel gun triggers the hole by immersion of the fluid, so that the fuel gun jumps, thereby achieving the purpose of controlling refueling, wherein the ventilation breather valve 100 is always in an open state, and the internal pressure and the external pressure of the fuel tank 200 are consistent.

The fuel tank 200 is provided with a canister 300 connected with the breather valve 100, the canister 300 is connected with the exhaust hole 14 of the breather valve 100 through a pipeline, and the oil gas exhausted from the fuel tank 200 enters the canister 300 and is stored.

Principle of operation

The embodiment of the application provides a breather valve and mechanical seal fuel oil system ventilates, because the breather valve 100 of ventilating of this application has set up valve body 1, this valve body 1 includes open-top closed disk seat 11 all around to and be located the top of disk seat 11 and seal its open-top's valve gap 12, be equipped with the vertical guide pipe post 13 that upwards extends in disk seat 11, offer the exhaust hole 14 with guide pipe post 13 intercommunication on valve gap 12. And the valve core 2, wherein the valve core 2 comprises a plug 22 positioned in the guide pipe column 13 and a compression spring 21 for driving the plug 22 to close the exhaust hole 14, and when the turning angle of the valve body 1 is smaller than a set value, the plug 22 enables the compression spring 21 to contract to open the exhaust hole 14.

Therefore, the ventilation breather valve 100 of the present application has set up the choke plug 22 in the guide pipe post 13, and the compression spring 21 that drives the choke plug 22 to seal the exhaust hole 14, under normal circumstances, the gravity of choke plug 22 is greater than the elasticity of compression spring 21, the choke plug 22 compresses compression spring 21 to a certain position until the gravity of choke plug 22 and the elasticity of compression spring 21 reach the equilibrium state, the exhaust hole 14 of ventilation breather valve 100 is in the open state this moment, in the refueling process through ventilation breather valve 100 with fuel steam guide to carbon tank 300, exhaust hole 14 can not be closed in the refueling process, and guaranteed the breathing of oil tank 200 under the static and dynamic road conditions of vehicle, the internal and external pressure of oil tank 200 is the same.

In a rollover state, when the turning angle of the ventilation breather valve 100 reaches a set value or more, the elastic force of the compression spring 21 is greater than the gravity component of the plug 22, at this time, the elastic force of the compression spring 21 elastically supports the plug 22, and the plug 22 closes the exhaust hole 14 of the valve cover 12, so that the ventilation breather valve 100 is in a closed state, and oil is prevented from leaking out of the oil tank 200. This application has guaranteed that oil tank 200 is under normal operating mode, and breather valve 100 of ventilating communicates oil tank 200 and atmosphere to make oil tank 200 can normally breathe, when the vehicle turned on one's side, breather valve 100 of ventilating can self-closing, prevents that the oil tank fuel from leaking, has improved the security performance.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ventilation breather valve (100), comprising:

the valve comprises a valve body (1), wherein the valve body (1) comprises a valve seat (11) with a top opening and a periphery closed, and a valve cover (12) which is positioned at the top of the valve seat (11) and closes the top opening of the valve seat, a guide pipe column (13) which vertically extends upwards is arranged in the valve seat (11), and an exhaust hole (14) communicated with the guide pipe column (13) is formed in the valve cover (12);

the valve core (2) comprises a plug (22) positioned in the guide pipe column (13) and a compression spring (21) for driving the plug (22) to close the exhaust hole (14), and when the overturning angle of the valve body (1) is smaller than a set value, the plug (22) compresses the compression spring (21) to open the exhaust hole (14).

2. A ventilation breather valve as defined in claim 1, wherein:

the bottom of the valve seat (11) is provided with an air inlet (23), the side wall of the guide pipe column (13) is provided with a plurality of vent holes (24), and the vent holes (24) are circumferentially arranged along the pipe wall of the guide pipe column (13).

3. A ventilation respiratory valve as claimed in claim 1 wherein:

the gravity of the plug (22) is larger than the elastic force of the compression spring (21), and when the overturning angle of the valve body (1) is larger than a set value, the elastic force of the compression spring (21) is larger than the gravity component of the plug (22).

4. A ventilation respiratory valve as claimed in claim 1 wherein:

the exhaust hole (14) is of a conical structure with a small upper caliber and a large lower caliber, the plug (22) is of a spherical structure, and the maximum caliber of the exhaust hole (14) is smaller than the diameter of the plug (22).

5. A ventilation breather valve as defined in claim 1, wherein:

the exhaust hole (14) is of a conical structure with a small upper caliber and a large lower caliber, the plug (22) is of a cylindrical structure, and the maximum caliber of the exhaust hole (14) is smaller than the diameter of the plug (22).

6. A ventilation breather valve as defined in claim 1, wherein:

the exhaust hole (14) is of a conical structure with a small upper caliber and a large lower caliber, the plug (22) is of a circular truncated cone-shaped structure with a small upper diameter and a large lower diameter, and the maximum caliber of the exhaust hole (14) is smaller than the maximum diameter of the plug (22).

7. A ventilation breather valve as defined in claim 1, wherein:

when the turning angle of the valve body (1) is smaller than 60 degrees, the plug (22) compresses the compression spring (21) to open the exhaust hole (14).

8. A ventilation breather valve as defined in claim 1, wherein:

the valve is characterized in that buckles (16) extending into the valve seat (11) are arranged on the periphery of the valve cover (12), and connecting holes (17) connected with the buckles (16) are formed in the side wall of the valve seat (11).

9. A ventilation breather valve as defined in claim 1, wherein:

the valve cover (12) is provided with an annular groove (15) connected with the guide pipe column (13), the annular groove (15) is positioned around the exhaust hole (14), and the top of the guide pipe column (13) is positioned in the annular groove (15).

10. A mechanically sealed fuel system, characterized by comprising a breather valve (100) according to any one of claims 1 to 9;

and a fuel tank (200) accommodating the ventilation and respiration valve (100), wherein the ventilation and respiration valve (100) is fixed on the top surface of the fuel tank (200);

the fuel tank (200) is provided with a filling pipe (400) extending into the fuel tank (200), and the oil outlet of the filling pipe (400) is lower than the bottom surface of the ventilation breather valve (100);

the carbon tank (300) connected with the ventilation breather valve (100) is arranged on the fuel tank (200), and the carbon tank (300) is connected with the exhaust hole (14) of the ventilation breather valve (100) through a pipeline.