CN206770081U - Carbon dust fuel tank cap and engine - Google Patents

Abstract

The utility model discloses a kind of carbon dust fuel tank cap and engine, fuel tank cap includes shell and tank body, there is the exhaust gear for being used for adsorbing oil vapour in tank body, exhaust gear, which includes one, makes adsorption chamber that is that steam connect by the column air intake duct that is flowed up in fuel tank and with the gas outlet of column air intake duct and being full of carbon dust, the air inlet of column air intake duct is located at bottom, and gas outlet is located at top；Column inlet channel of the present utility model and the tank body of fuel tank cap are contour, with enough distances so as to avoiding fuel oil from being directly entered adsorption chamber, and the distance to set demisting layer (drop adsorption layer) in column air intake duct, further avoids fluid from entering adsorption chamber；There is column air intake duct that there is height enough, the setting for adsorption chamber also has the possibility for lengthening steam flow, steam, so as to reach preferable clean-up effect, is met the requirement to environmental protection by whole carbon dusts, is also met the requirement of CARB discharge vaporizations.

Description

Carbon dust fuel tank cap and engine

Technical field

It the utility model is related to a kind of engine components and engine, more particularly to carbon dust fuel tank cap and engine.

Background technology

For engine oil tank, annex is adsorbed come the pressure in trim tank by oil vapour, to ensure fully to supply Oil.For put-put, said process is completed by setting adsorption structure in fuel tank cap.In the prior art, compared with More is carbon dust will to be filled inside fuel tank cap, and when the pressure in fuel tank is more than ambient pressure, the oil gas in fuel tank passes through carbon dust Chamber is discharged into the external world to reach internal and external pressure balance, and when oil gas is by carbon dust chamber, fuel oil is received by carbon dust part, after filtering Gas is discharged into the external world, to reach the purpose of purification fuel-steam.This structure is after gasoline vapor entrance, generally along nearer Path escaped within the relatively short time in air, clean-up effect is undesirable, and fuel oil is easily accessible inside, can soak Powdered carbon near air admission hole, influence to ventilate.To solve the above problems, have also appeared big chamber one volume of bottom design very Independent small chamber small, with labyrinth structure；Although gasoline liquid can be increased into the path of the big chamber where powdered carbon, But structure is complex, or even this single chamber also needs to seal to be sealed, and absorption and clean-up effect Also unobvious, discharge can not meet the increasingly strict environmental protection index of requirement, for example can not meet the requirement of CARB discharge vaporizations, shadow Ring the world market of national engine.

Therefore, it is necessary to be improved to the fuel tank cap of existing filling carbon dust, effectively fuel oil can be avoided to be filled out into carbon dust Region is filled, and adsorption effect can be ensured, the index of purified gas is also ensured that, disclosure satisfy that environmental requirement.

Utility model content

In view of this, the purpose of this utility model is to provide a kind of carbon dust fuel tank cap and engine, can effectively avoid firing Oil enters packing carbon powder region, and can ensure adsorption effect, also ensures that the index of purified gas, disclosure satisfy that environmental requirement.

Carbon dust fuel tank cap of the present utility model, including shell and tank body, tank body is interior to have the exhaust for being used for adsorbing oil vapour Mechanism, the exhaust gear, which includes one, makes steam by the column air intake duct that is flowed up in fuel tank and the outlet with column air intake duct Adsorption chamber that is that mouth connects and being full of carbon dust, the air inlet of the column air intake duct are located at bottom, and gas outlet is located at top；Column Air intake duct is general by the way of being vertically arranged, and bottom is towards fuel tank internal, by the sky for being fixed on tank base and upwardly extending Stem forms (being typically formed in one), and gas outlet is formed by column air intake duct upper end edge opening；And column air intake duct and tank Body is contour, can set adsorption chamber around it as needed；Annexation between the shell and tank body of fuel tank cap belongs to existing Technology, it will not be repeated here.

Further, it is provided with the column air intake duct at gas outlet and removes vaporware；Except vaporware is typically using breathable And can effectively block the material that liquid passes through and be made, including ventilative layer of cloth, foam etc., preferably foam, foam has preferable Venting capability, and be not in the problem of residue drops, ensure the cleaning of liquid level of fuel oil in fuel tank；During installation, in column air intake duct Wall is located at top and forms downward heavy platform, described except vaporware (foam) is held in the palm on heavy platform, and is pushed down by top cover；Effectively prevent Liquid enters adsorption chamber, simple in construction, and installation is stable；Except the length of the column inlet channel shared by vaporware is 1/3rd or so To be optimal, during column air inlet is logical, bottom be without any filler, can effectively subtract climbing upwards for light gasoline liquid.

Further, the adsorption chamber is included to be multiple, and multiple adsorption chambers are each filled with carbon dust and be sequentially communicated to be arranged in column Behind the gas outlet of air intake duct, wherein first adsorption chamber is communicated in the gas outlet of column air intake duct, tail end adsorption chamber by purified gas most Discharge eventually；Adsorption chamber is multiple serial communications, increases operation length, constrains the flow direction of steam, beneficial to guarantee adsorption effect.

Further, the column air intake duct is located in the middle part of tank body, and multiple adsorption chambers are around arranging around column air intake duct And between adjacent adsorbent room and each share common sidewalls between adsorption chamber and column air intake duct, the air inlet of each adsorption chamber and go out Gas port is relative up and down across carbon dust region so that flow of the gas in adsorption chamber passes through whole carbon dust region；In this structure, enter Across carbon dust region and also in position opposing upper and lower among gas port and gas outlet so that flowing in each adsorption chamber Steam passes through whole carbon dust region, forms the more full utilization to carbon dust；Meanwhile multiple absorption are set in limited region Room, adsorption process is effectively increased in a circumferential direction, with reference to effective utilization of carbon dust in single adsorption chamber, avoid one big inhale Carbon dust existing for alcove utilizes incomplete problem, greatly ensure that adsorption effect so that fuel tank cap of the present utility model exists It can ensure to evaporate the sufficiently cleaned up of oil vapour during use, and be met using the engine of the fuel tank cap and fuel tank The requirement of CARB discharge vaporizations.

Further, the tail end adsorption chamber by purified gas eventually through the column exhaust passage being arranged in tail end adsorption chamber Discharge, the air inlet of the column exhaust passage are located at upper end and gas is flowed to from top to bottom positioned at column exhaust passage bottom Exhaust outlet, the air inlet of the tail end adsorption chamber is relative across carbon dust region with column exhaust passage and close to bottom, tail end The gas outlet of adsorption chamber is the air inlet of column exhaust passage；Column exhaust passage is equally by being fixed on tank base and upward The hollow cylindrical of extension sets exhaust outlet into (being typically formed in one), column exhaust passage bottom, and the diameter of outlet is less than The diameter of column exhaust passage；Exhaust outlet positioned at bottom is more conducive to prevent foreign object from entering, beneficial to waterproof.

Further, air inlet or the gas outlet that each adsorption chamber has close to bottom, the air inlet or outlet are directed to Mouth in upper and lower list structure or has setpoint distance apart from bottom；In i.e. all adsorption chambers, respectively with air inlet or Gas outlet, as long as positioned at the position of close bottom, there is setpoint distance in upper and lower list structure or apart from bottom, During use, the particulate after powdered carbon refinement can be deposited on the bottom of adsorption chamber under effect of vibration, and the structure can avoid refining Carbon dust afterwards blocks air inlet and gas outlet after sinking to the bottom；Thus, in design process, can typically set list structure height and The height of other structures opening is higher than the height of the carbon dust after the refinement of prediction；The utility model is preferably list structure Opening, increase throughput and avoid blocking, ensure that the circulation of oil vapour and balanced gas is smooth.

Further, the column air intake duct is shaped in tank body, and arc is internally formed on the bottom of the column air intake duct Face depressed deformation, the air inlet of the column air intake duct are located at the center of the cambered surface depressed deformation；Cambered surface depressed deformation can increase The height of gas port is added, and the edge being recessed can stop the entrance of fuel droplets, ensure that using effect；Meanwhile cambered surface is recessed Deformation can also make the fluid of attachment back downward into fuel tank.

Further, the tank body has a top cover, and the top seal is pressed on tank body upper opening and by column air intake duct And the upper opening sealing of each adsorption chamber, the carbon dust top of each adsorption chamber are pressed with ventilative packing layer, the head Ventilative resistance carbon-coating is also separated between the packing layer and carbon dust of individual adsorption chamber；Filled with ventilative in the column exhaust passage Separation layer；Packing typically uses the preferable foam of venting capability, and stability is higher, has preferable vibration isolating effect, and Gas permeability is preferable, effectively mitigates or extend refinement and micronized of the powdered carbon under engine luggine effect, to ensure making for carbon dust With the life-span, and ensure to play not being blocked.The purpose for hindering carbon-coating has been to prevent outlet of the powdered carbon particulate by column inlet channel Mouth enters the passage, and travels further into fuel tank, so as to influence the normal use of fuel oil；Carbon-coating is hindered typically using the tool such as non-woven fabrics There are the material of preferable air permeable effect and some strength, preferably non-woven fabrics；The adsorption chamber is two to eight, disclosure satisfy that suction Sub conditione, and be centered around around column air intake duct, compact structure is formed, and preferable clean-up effect can be realized；Although The more adsorption effects of adsorption chamber quantity can be more preferable, but can also increase resistance, and the discharge to fuel tank internal balance and oil vapour is inhaled It is attached to cause difficulty, and cause bigger difficulty for manufacturing process；Through final it is demonstrated experimentally that two to eight adsorption chambers can be complete Adsorption effect needed for full satisfaction, meet the utility model purpose, and good balance requirement can be reached.

Further, the adsorption chamber is four, and along the circumferential direction decile is arranged in around column air intake duct, respectively first Adsorption chamber, the second adsorption chamber, the 3rd adsorption chamber and the 4th adsorption chamber, first adsorption chamber are inhaled as first adsorption chamber, the 4th Alcove is tail end adsorption chamber；First adsorption chamber, the gas outlet of the 3rd adsorption chamber are close to bottom and to should be used as the second absorption Room and the air inlet of the 4th adsorption chamber, the gas outlet of the second adsorption chamber is close to top and as the air inlet of the 3rd adsorption chamber；Adopt With the structure of four adsorption chambers, and relative symmetry, beneficial to integral arrangement, and it is easy to process, there is preferable manufacturability；Four suctions Alcove be centered around around column inlet channel and with its share common sidewalls, meanwhile, the adjacent also share common sidewalls of four adsorption chambers, directly It is connected in side wall and staggeredly opens up air inlet or gas outlet up and down, it is simple and compact for structure, ensure enough adsorption process.

Continuous projection is provided with along the upper surface of the tank body, the top cover corresponds to described continuous after covering on tank body Projection uses ultrasonic bonding between top cover and tank body.The upper surface of tank body includes the upper surface at the edge of tank body, each suction The upper surface of the side wall of alcove and the upper surface of the side wall of column air intake duct, the continuous raised upper end along the edge of tank body Face, each adsorption chamber side wall upper surface and column air intake duct side wall upper surface length direction on continuously set, The top cover corresponds to the continuous projection and ultrasonic bonding is used between top cover and tank body after covering on tank body.

The gas outlet of the column air intake duct and each adsorption chamber are close to the air inlet at top or gas outlet by side The opening on wall top is formed, and the continuous projection avoids the opening.

During actual use, the top cover is provided with downward continuous stopper slot, the upper end at the edge of the stopper slot and tank body The upper surface of the side wall of face and each adsorption chamber is corresponding, cause after the upper surface insertion annular spacing groove it is continuous it is raised with Stopper slot bottom land contacts, between top cover and tank body between the continuous projection of the upper surface of annular spacing groove bottom land and tank body Using ultrasonic bonding；As illustrated, top cover, which is covered behind top, forms relatively independent adsorption chamber and column inlet channel, remove Connected by more air inlet with gas outlet, not without passage, ensure that adsorption process.

As illustrated, the section of annular protrusion is triangle, after when carrying out ultrasonic bonding, the annular protrusion dissolves with Top cover is welded as a whole, and has good welding procedure, saves manufacturing cost, and ensure overall sealing.

The invention also discloses a kind of general purpose engine, engine employs described carbon dust fuel tank cap, the carbon Powder fuel tank cap is used for the fuel tank of the engine.

The beneficial effects of the utility model：Carbon dust fuel tank cap of the present utility model and engine, the exhaust gear of fuel tank cap Inlet channel make steam by the column air intake duct that is flowed up in fuel tank using one, the tank of the column inlet channel and fuel tank cap Body is contour, has enough distances so as to avoid fuel oil from being directly entered adsorption chamber, and the distance to set in column air intake duct Demisting layer (drop adsorption layer) is possibly realized, and further avoids fluid from entering adsorption chamber；There is column air intake duct that there is height enough, Setting for adsorption chamber also has the possibility for lengthening steam flow, makes steam by whole carbon dusts, preferable so as to reach Clean-up effect, meet the requirement to environmental protection, also meet the requirement of CARB discharge vaporizations.

Brief description of the drawings

The utility model is further described with reference to the accompanying drawings and examples.

Fig. 1 is the tank structure schematic diagram of the utility model fuel tank cap；

Fig. 2 is Fig. 1 along A-A to sectional view (being assembled into fuel tank cap)；

Fig. 3 is Fig. 1 along B-B direction sectional view (being assembled into fuel tank cap)；

Fig. 4 is enlarged drawing at Fig. 2 C；

Fig. 5 is cap structure schematic diagram.

Embodiment

Fig. 1 is the tank structure schematic diagram of the utility model fuel tank cap, and Fig. 2 is that Fig. 1 (is assembled into oil along A-A to sectional view Case lid), Fig. 3 be Fig. 1 along B-B direction sectional view (being assembled into fuel tank cap), Fig. 4 is enlarged drawing at Fig. 2 C, as shown in the figure：The present embodiment Carbon dust fuel tank cap, including shell 14 and tank body 1, there is the exhaust gear for being used for adsorbing oil vapour, the air exhauster in tank body 1 Structure, which includes one, makes steam by the column air intake duct 2 that is flowed up in fuel tank and connecting with the gas outlet 8 of column air intake duct 2 and fill The adsorption chamber of full carbon dust, the air inlet 23 of the column air intake duct 2 are located at bottom, and gas outlet is located at top；Column air intake duct one As by the way of being vertically arranged, bottom towards fuel tank internal, by the hollow cylindrical that is fixed on tank base and upwardly extends into (being typically formed in one, be preferably formed in one), gas outlet are formed by column air intake duct upper end edge opening；And column air inlet Road is contour with tank body, can set adsorption chamber around it as needed；Annexation category between the shell and tank body of fuel tank cap In prior art, will not be repeated here.

It is provided with the present embodiment, in the column air intake duct 2 at gas outlet 8 and removes vaporware 28；Except vaporware 28 is typically adopted With breathable and can effectively block the material that liquid passes through and be made, including ventilative layer of cloth, foam etc., preferred foam, foam With preferable venting capability, and be not in the problem of residue drops, ensure the cleaning of liquid level of fuel oil in fuel tank；During installation, post Shape air intake duct inwall is located at top and forms downward heavy platform, described except vaporware (foam) is held in the palm on heavy platform, and by top cover pressure Firmly；Effectively prevent liquid from entering adsorption chamber, simple in construction, installation is stable；Except the length of the column inlet channel shared by vaporware exists 1/3rd or so is optimal, during column air inlet is logical, bottom be without any filler, can effectively subtract the upward of light gasoline liquid Climb.

In the present embodiment, the adsorption chamber is included to be multiple, and multiple adsorption chambers are each filled with carbon dust and be sequentially communicated to be arranged in Behind the gas outlet of column air intake duct, wherein first adsorption chamber is communicated in the gas outlet of column air intake duct, tail end adsorption chamber will purify Gas is finally discharged；Adsorption chamber is multiple serial communications, increases operation length, constrains the flow direction of steam, is adsorbed beneficial to guarantee Effect.

It is 4 adsorption chambers in figure, the carbon dust of filling is respectively 15,16,17,18.

In the present embodiment, the column air intake duct 2 is located at the middle part of tank body 1, and multiple adsorption chambers were around column air intake duct 2 weeks Enclose between arrangement and adjacent adsorbent room and each share common sidewalls, each adsorption chamber between adsorption chamber and column air intake duct 2 enter Gas port and gas outlet are relative up and down across carbon dust region so that flow of the gas in adsorption chamber passes through whole carbon dust region；This In structure, across carbon dust region and also in position opposing upper and lower among air inlet and gas outlet so that each adsorption chamber The steam of interior flowing passes through whole carbon dust region, forms the more full utilization to carbon dust；Meanwhile set in limited region Multiple adsorption chambers are put, are effectively increased adsorption process in a circumferential direction, with reference to effective utilization of carbon dust in single adsorption chamber, are avoided One big carbon dust existing for adsorption chamber utilizes incomplete problem, greatly ensure that adsorption effect so that the utility model Fuel tank cap can ensure to evaporate the sufficiently cleaned up of oil vapour in use, and use the hair of the fuel tank cap and fuel tank Motivation meets CARB discharge vaporization requirements.

In the present embodiment, purified gas is vented by the tail end adsorption chamber eventually through the column being arranged in tail end adsorption chamber Passage 5 is discharged, and the air inlet 13 of the column exhaust passage 5 is located at upper end and gas is flowed to from top to bottom to be vented positioned at column The exhaust outlet 12 of the bottom of passage 5, the air inlet of the tail end adsorption chamber is relative across carbon dust region with column exhaust passage and leans on Nearly bottom, the gas outlet of tail end adsorption chamber are the air inlet of column exhaust passage；Column exhaust passage 5 is equally by being fixed on tank Body bottom and the hollow cylindrical that upwardly extends are into (being typically formed in one, be preferably formed in one), the bottom of column exhaust passage 5 Exhaust outlet 12 is set, as illustrated, exhaust outlet 12 is directly machined in the bottom of tank body 1 and 5 corresponding position of column exhaust passage；Should The diameter of exhaust outlet 12 is less than the diameter of column exhaust passage, avoids inner material from flowing out, is also easy to fill out in column exhaust passage Fill material；Exhaust outlet positioned at bottom is more conducive to prevent foreign object from entering, beneficial to waterproof.

In the present embodiment, be directed to air inlet or gas outlet that each adsorption chamber has close to bottom, the air inlet or Gas outlet in upper and lower list structure or has setpoint distance apart from bottom；In i.e. all adsorption chambers, respectively with air inlet Or gas outlet, as long as positioned at close to the position of bottom, there is setting in upper and lower list structure or apart from bottom Distance, during use, the particulate after powdered carbon refinement can be deposited on the bottom of adsorption chamber under effect of vibration, and the structure can avoid Carbon dust after refinement blocks air inlet and gas outlet after sinking to the bottom；Thus, in design process, the height of list structure can typically be set And the height of other structures opening is higher than the height of the carbon dust after the refinement of prediction；The utility model is preferably strip knot The opening of structure, increase throughput and avoid blocking, ensure that the circulation of oil vapour and balanced gas is smooth.

In the present embodiment, the column air intake duct 2 is shaped in tank body 1, and the bottom of the column air intake duct 2 is internally Cambered surface depressed deformation 31 is formed, the air inlet 23 of the column air intake duct 5 is located at the center of the cambered surface depressed deformation, and diameter is small In the internal diameter of column air intake duct；As illustrated, air inlet is directly machined in tank base position corresponding with column inlet channel, The namely bottom of inlet channel；Cambered surface depressed deformation 31 can increase the height of air inlet, be easy to guide oil vapour to enter, and The edge of depression can stop the entrance of fuel droplets, ensure that using effect；Meanwhile cambered surface depressed deformation can also make the oil of attachment Liquid backs downward into fuel tank.

As illustrated, baffle plate 27 is additionally provided with positioned at the bottom of tank body 1 is corresponding with the air inlet 23 of column air intake duct 2, the gear Plate 27 is provided with through hole 24, for into oil vapour, meanwhile, also fluid can tentatively be stopped, further avoid fluid from entering Column air intake duct.Meanwhile the baffle plate is still used for fuel tank cap being tightened on load-carrying construction part on fuel tank, during through hole 24 thereon Strip, width is 2mm or so；As illustrated, the baffle plate 27 penetrates tank body simultaneously by rivet in the bottom of tank body 1, rivet Riveted in tank body with a setting reinforcing plate 25, the reinforcing plate 25 is along the circumferential direction embedded in the root of column inlet channel side wall In the annular groove of setting.

In the present embodiment, the adsorption chamber is two to eight, using the structure being centered around around column air intake duct, Neng Gouman Sufficient adsorption conditionses, and be centered around around column air intake duct, compact structure is formed, and preferable clean-up effect can be realized； Although the more adsorption effects of adsorption chamber quantity can be more preferable, it can also increase resistance, to fuel tank internal balance and the row of oil vapour Go out absorption and cause difficulty, and bigger difficulty is caused for manufacturing process；Through final it is demonstrated experimentally that two to eight adsorption chamber energy Adsorption effect needed for enough complete satisfactions, meets the utility model purpose, and can reach good balance requirement.

In the present embodiment, the tank body 1 has top cover 26, and the sealing of top cover 26 is pressed on the upper opening of tank body 1 and will The upper opening sealing of column air intake duct 2 and each adsorption chamber, the carbon dust top of each adsorption chamber are pressed with ventilative shockproof material The bed of material, it is four adsorption chambers in figure, packing layer is respectively 19,20,21,22；The packing layer of the first adsorption chamber Ventilative resistance carbon-coating 29 is also separated between carbon dust；Filled with ventilative separation layer 30 in the column exhaust passage 5, it is generally Column exhaust passage 5 is filled up, forms effectively barrier, avoids material leakage or foreign object from entering；Packing is typically using logical The foam of gas better performances, stability is higher, has preferable vibration isolating effect, and gas permeability is preferable, effectively mitigates or extend charcoal Refinement and micronized of the powder under engine luggine effect, to ensure the service life of carbon dust, and ensure to play not being blocked.Resistance The purpose of carbon-coating has been to prevent powdered carbon particulate from entering the passage by the gas outlet of column inlet channel, and travels further into oil Case, so as to influence the normal use of fuel oil；It is typically with preferable air permeable effect and necessarily strong using non-woven fabrics etc. to hinder carbon-coating 29 The material of degree, preferably non-woven fabrics.

In the present embodiment：Packing layer is pasted onto on top cover 26, is mounted directly during use, thickness is 2-3mm；Hinder carbon The thickness of layer is 5-7mm, ensures first chamber carbon dust total amount amount, and make carbon dust particulate be not easy to penetrate or cross the layer.

In the present embodiment, the adsorption chamber is four, and along the circumferential direction decile is arranged in around column air intake duct, is respectively First adsorption chamber 6, the second adsorption chamber 7, the 3rd adsorption chamber 3 and the 4th adsorption chamber 4, first adsorption chamber is as first absorption Room, the 4th adsorption chamber are tail end adsorption chamber；First adsorption chamber 6, the gas outlet of the 3rd adsorption chamber 3 are close to bottom and corresponding work For the second adsorption chamber 7 and the air inlet of the 4th adsorption chamber 4, as illustrated, the gas outlet 9 of first adsorption chamber 6 is used as second The air inlet of adsorption chamber 7, the gas outlet 11 of the 3rd adsorption chamber 3 are used as the air inlet of the 4th adsorption chamber 4；Second adsorption chamber 7 goes out Gas port 10 is close to top and as the air inlet of the 3rd adsorption chamber 3, and the air inlet close to top is by the side between adjacent adsorbent room Wall upper end open is formed, easy to process；Using the structure of four adsorption chambers, and relative symmetry, beneficial to integral arrangement, and be easy to plus Work, there is preferable manufacturability；Four adsorption chambers be centered around around column inlet channel and with its share common sidewalls, meanwhile, four The adjacent also share common sidewalls of individual adsorption chamber, staggeredly open up air inlet or gas outlet up and down directly in side wall, it is simple in construction tight Gather, ensure enough adsorption process.

Continuous raised 1a is provided with along the upper surface of the tank body 1, the top cover 26 corresponds to described after covering on tank body 1 Continuous raised 1a uses ultrasonic bonding between top cover and tank body.The upper surface of tank body 1 includes the upper end at the edge of tank body Face, each adsorption chamber side wall upper surface and column air intake duct side wall upper surface, this is continuous raised along tank body The upper surface at edge, each adsorption chamber side wall upper surface and column air intake duct side wall upper surface length direction on Continuously set, the top cover corresponds to the continuous projection and supersonic welding is used between top cover and tank body after covering on tank body Connect.

(the first adsorption chamber 6, the second adsorption chamber the 7, the 3rd are inhaled for the gas outlet of the column air intake duct 2 and each adsorption chamber The adsorption chamber 4 of alcove 3 and the 4th) close to top air inlet or gas outlet (gas outlet of the second adsorption chamber) by side wall upper part Opening formed, top cover then forms complete air inlet or gas outlet after covering, and the continuous projection avoids described open Mouthful.

During actual use, the top cover 26 is provided with downward continuous stopper slot 26a, stopper slot 26a and tank body 1 side The upper surface of the side wall of the upper surface on edge and each adsorption chamber is corresponding, causes after the upper surface insertion annular spacing groove 26a Continuous raised 1a is contacted with stopper slot 26a bottom lands, and annular spacing groove 26a bottom lands and tank body 1 are located between top cover 26 and tank body 1 Upper surface it is continuous it is raised between use ultrasonic bonding；As illustrated, top cover cover behind top formed it is relatively independent Adsorption chamber and column inlet channel, except being connected by more air inlet with gas outlet, not without passage, it ensure that absorption stream Journey.

It is mounted directly because packing layer is pasted onto on top cover 26, and it is corresponding with each adsorption chamber, and stopper slot is not But beneficial to installation and welding, moreover it is possible to ensure that the packing on top cover is corresponding with each adsorption chamber, improve installation effectiveness.

As illustrated, after welding, the top side wall at the edge of tank body, the side wall of adsorption chamber and column inlet channel is put down Together, top cover, which is covered behind top, forms relatively independent adsorption chamber and column inlet channel, except passing through more air inlet and outlet Mouth is connected, and not without passage, ensure that adsorption process.

As illustrated, annular protrusion 1a section is triangle, after when carrying out ultrasonic bonding, the annular protrusion dissolves It is welded as a whole with top cover, there is good welding procedure, saves manufacturing cost, and ensure overall sealing.

The invention also discloses a kind of general purpose engine, engine employs described carbon dust fuel tank cap, the carbon Powder fuel tank cap is used for the fuel tank of the engine.

The utility model is when in use：

Route of the gasoline vapor to air：As shown by arrows in FIG., steam is from the air inlet of column inlet channel bottom, on Top vent is raised to, the first adsorption chamber is entered by the exhaust outlet；Again from (the second absorption of the gas outlet of the first adsorption chamber bottom The air inlet of room) enter the second adsorption chamber；Enter again from the gas outlet (air inlet of the 3rd adsorption chamber) at the top of the second adsorption chamber 3rd adsorption chamber；From the gas outlet of the 3rd adsorption chamber bottom, (air inlet of the 4th adsorption chamber) enters the 4th adsorption chamber again；Finally Enter column exhaust passage from the air inlet at the top of column exhaust passage, discharged by the exhaust outlet of column exhaust passage bottom.

On the route of gasoline vapor approach, the powdered carbon of four adsorption chambers can sufficiently be adsorbed to it, be reduced last The gasoline vapor spilt into air, so as to meet the laws and regulations requirement of discharge vaporization.

In engine working process, fresh air is externally entering, and flow on the contrary, can also carry out blowback if necessary；From And the pressure balance in the inside and outside portion of fuel tank is realized, ensure the normal use of engine.

Finally illustrate, above example is only unrestricted to illustrate the technical solution of the utility model, although ginseng The utility model is described in detail according to preferred embodiment, it will be understood by those within the art that, can be to this The technical scheme of utility model is modified or equivalent substitution, without departing from the objective and model of technical solutions of the utility model Enclose, it all should cover among right of the present utility model.

Claims (10)

1. A kind of 1. carbon dust fuel tank cap, it is characterised in that：There is the exhaust for being used for adsorbing oil vapour including shell and tank body, in tank body Mechanism, the exhaust gear, which includes one, makes steam by the column air intake duct that is flowed up in fuel tank and the outlet with column air intake duct Adsorption chamber that is that mouth connects and being full of carbon dust, the air inlet of the column air intake duct are located at bottom, and gas outlet is located at top.
2. 2. carbon dust fuel tank cap according to claim 1, it is characterised in that：Set in the column air intake duct at gas outlet Have and remove vaporware.
3. 3. carbon dust fuel tank cap according to claim 1, it is characterised in that：It is multiple, multiple absorption that the adsorption chamber, which includes, After room is each filled with carbon dust and is sequentially communicated and is arranged in the gas outlet of column air intake duct, wherein first adsorption chamber is communicated in column air inlet The gas outlet in road, tail end adsorption chamber finally discharge purified gas.
4. 4. carbon dust fuel tank cap according to claim 3, it is characterised in that：The column air intake duct is located in the middle part of tank body, more Individual adsorption chamber around around column air intake duct between arrangement and adjacent adsorbent room and each adsorption chamber and column air intake duct it Between share common sidewalls, the air inlet of each adsorption chamber and gas outlet are relative up and down across carbon dust region so that gas is in adsorption chamber Flow pass through whole carbon dust region.
5. 5. carbon dust fuel tank cap according to claim 3, it is characterised in that：The tail end adsorption chamber by purified gas eventually through The column exhaust passage discharge being arranged in tail end adsorption chamber, the air inlet of the column exhaust passage are located at upper end and make gas Flow direction is positioned at the exhaust outlet of column exhaust passage bottom, air inlet and the column exhaust passage of the tail end adsorption chamber from top to bottom Relative across carbon dust region and close bottom.
6. 6. carbon dust fuel tank cap according to claim 3, it is characterised in that：It is directed to what each adsorption chamber had close to bottom Air inlet or gas outlet, either gas outlet in upper and lower list structure or has setpoint distance to the air inlet apart from bottom.
7. 7. carbon dust fuel tank cap according to claim 2, it is characterised in that：The column air intake duct is shaped in tank body, Cambered surface depressed deformation internally formed on the bottom of the column air intake duct, and it is recessed that the air inlet of the column air intake duct is located at the cambered surface The center of notch distortion.
8. 8. carbon dust fuel tank cap according to claim 5, it is characterised in that：The tank body has top cover, the top seal It is pressed on tank body upper opening and seals the upper opening of column air intake duct and each adsorption chamber, the carbon dust of each adsorption chamber Top is pressed with ventilative packing layer, and ventilative resistance carbon is also separated between the packing layer and carbon dust of the first adsorption chamber Layer；Filled with ventilative separation layer in the column exhaust passage；The adsorption chamber is two to eight.
9. 9. carbon dust fuel tank cap according to claim 8, it is characterised in that：The adsorption chamber is four, along the circumferential direction etc. Divide and be arranged in around column air intake duct, respectively the first adsorption chamber, the second adsorption chamber, the 3rd adsorption chamber and the 4th adsorption chamber, institute The first adsorption chamber is stated as first adsorption chamber, the 4th adsorption chamber is tail end adsorption chamber；First adsorption chamber, the 3rd adsorption chamber Close to bottom and to should be used as the air inlet of the second adsorption chamber and the 4th adsorption chamber, the gas outlet of the second adsorption chamber is close for gas outlet Top and as the air inlet of the 3rd adsorption chamber；

   Continuous projection is provided with along the upper surface of the tank body, the top cover corresponds to described continuous raised after covering on tank body Ultrasonic bonding is used between top cover and tank body,

   The gas outlet of the column air intake duct and each adsorption chamber are close to the air inlet at top or gas outlet by side wall The opening in portion is formed, and the continuous projection avoids the opening.
10. A kind of 10. general purpose engine, it is characterised in that：Engine employs the carbon described in claim 1 to 9 any claim Powder fuel tank cap, the carbon dust fuel tank cap are used for the fuel tank of the engine.