CN111098705A

CN111098705A - Air exhaust structure for national six-automobile fuel tank and fuel tank

Info

Publication number: CN111098705A
Application number: CN202010163177.9A
Authority: CN
Inventors: 椤惧嘲; 顾峰
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-10
Filing date: 2020-03-10
Publication date: 2020-05-05

Abstract

The invention discloses an exhaust structure for a fuel tank of a national six-wheeled automobile and the fuel tank: comprises an upper cover, wherein the upper cover is provided with a slot connected with a fuel tank; the upper cover is hermetically welded with the upper cavity, and the bottom of the upper cavity is provided with a main through hole; an involute spiral wall is arranged in the upper cavity; the baffle is arranged in the upper cavity body, and the baffle is connected with the involute spiral wall to divide the upper cavity body into two areas: the buffer comprises a first buffer area and a second buffer area, wherein an interface is arranged on the side surface of the first buffer area; the first buffer area is provided with auxiliary through holes; an air outlet is arranged on the side edge of the second buffer area; the second buffer area is provided with a lower short wall which surrounds the inlet of the exhaust port; a lower cavity is arranged below the upper cavity. This technical scheme effectively merges and refuels exhaust and work exhaust, reduces liquid and gathers, and the exhaust is unobstructed.

Description

Air exhaust structure for national six-automobile fuel tank and fuel tank

Technical Field

The invention relates to an automobile fuel tank, in particular to a venting structure for a national six-part automobile fuel tank and the fuel tank.

Background

Most of automobile fuels are volatile liquids, such as unleaded gasoline, ethanol gasoline, methanol and the like, and automobile fuel tanks also need to control and manage fuel vapor inside the fuel tanks while storing and sending the fuel. For fuel saving and environmental protection, the vapors are discharged into the canister, and the canister is filled with activated carbon with strong adsorption capacity, which can adsorb a large amount of fuel vapors to prevent the fuel vapors from being discharged into the atmosphere directly to cause environmental pollution.

Compared with the prior laws and regulations, the national emission laws and regulations in the sixth stage increase the pollutant emission experiments in the refueling process, require vehicles to collect vapor exhausted from a fuel tank in the refueling process, reduce the pollution of oil-gas emission to the environment in the automobile refueling process, save energy, and therefore a refueling exhaust valve with larger flow rate needs to be connected to a carbon tank.

However, when the vehicle runs on a bumpy road or a rugged road, the liquid in the fuel tank of the vehicle shakes violently, the fuel vapor discharged by the valve contains not only fuel gas but also liquid fuel, so that the liquid fuel is accumulated in the exhaust system to block the smoothness of exhaust, further liquid fuel enters the carbon canister under the action of pressure, and the liquid fuel cannot be effectively adsorbed and stored by the activated carbon in the carbon canister, so that the carbon canister fails to work, and the air is polluted.

In order to meet the requirements of new laws and regulations, a refueling vent valve needs to be connected to a carbon canister, but the flow of vapor discharged from the refueling vent valve in the refueling process is large, the speed is high and far greater than the working capacity of the working vent valve, and how to effectively connect two valves to the carbon canister simultaneously and reduce the accumulation of liquid fuel in the whole exhaust system is a technical problem which needs to be solved urgently in the technical field.

Disclosure of Invention

The invention aims to solve the technical problems mentioned above and provides a venting structure for a national six-degree automobile fuel tank and the fuel tank, and the technical scheme realizes the effective combination of working venting and refueling venting of the automobile fuel tank, meets the technical requirements of national six regulations on an automobile fuel system, reduces the accumulation of liquid fuel in the venting system, ensures the smoothness of a venting channel of the fuel tank and reduces the risk of carbon canister failure caused by the liquid fuel entering the carbon canister.

In order to achieve the purpose, the technical scheme of the invention is as follows, which is used for the exhaust structure and the fuel tank of the national six-wheeled automobile fuel tank: comprises an upper cover, wherein the upper cover is provided with a slot connected with a fuel tank; the upper cover is hermetically welded with the upper cavity, and the bottom of the upper cavity is provided with a main through hole with a larger drift diameter; an involute spiral wall projected as an involute spiral line is arranged in the upper cavity, and the involute spiral wall gradually opens outwards around the main through hole; the baffle is arranged in the upper cavity body, and the baffle is connected with the involute spiral wall to divide the upper cavity body into two areas: the first buffer area is used for buffering working exhaust; the second buffer area is used for oiling and exhausting for buffering, the first buffer area and the second buffer area are not directly communicated in the upper cavity, and an interface is arranged on the side surface of the first buffer area and is used for being connected with a working exhaust valve; the first buffer area is provided with auxiliary through holes with smaller drift diameters; an exhaust port is arranged on the side edge of the second buffer area and is used for connecting a carbon tank; the second buffer area is provided with a lower short wall which surrounds the inlet of the air outlet, so that the second buffer area and the air outlet are communicated only from the upper part of the short wall; a lower cavity is arranged below the upper cavity, two sides of the side wall of the lower cavity extend downwards to form a support, and the support is provided with a fixing structure for fixing an oil filling exhaust valve; the side wall of the lower cavity and the top of the oil filling exhaust valve surround to form the inner space of the lower cavity.

As a preferable aspect of the present invention: the slot of upper cover has arranged the locating hole for the spacing of inserted position when upper cover and fuel tank installation increases assembly structure's drawing force.

As a preferable aspect of the present invention: the bottom of the upper cavity is a smooth curved surface and is provided with only one lowest point which is funnel-shaped, the lowest point of the funnel shape is the main through hole, and therefore liquid is not easy to accumulate at the bottom of the upper cavity and can flow back to the inside of the fuel tank through the main through hole.

As a preferable aspect of the present invention: the upper cavity is in a combined shape of a cylinder and an inverted cone, the main through hole is arranged at the vertex of the inverted cone and can be coaxial with a valve similar to the cylinder after being assembled, so that the assembled valve is uniformly stressed, and liquid can quickly flow back into the fuel tank through the main through hole.

As a preferable aspect of the present invention: the involute spiral wall rotates at least 360 degrees around the axis of the involute spiral wall, and the baffle plates are distributed at the beginning end and the tail end which are close to the involute spiral wall, so that the first buffer zone obtains a longer channel.

As a preferable aspect of the present invention: the auxiliary through hole is close to the minimum radius of the involute spiral wall in the first buffer area, so that liquid can reversely flow back to the fuel tank along the involute spiral wall through the auxiliary through hole in the first buffer area and is not easy to accumulate.

As a preferable aspect of the present invention: the interface is arranged on the other side in the first buffer area channel opposite to the auxiliary through hole, so that gas-liquid mixed gas coming out of the interface releases pressure due to the reducing of the channel, and the back pressure of the working exhaust channel is relieved.

As a preferable aspect of the present invention: the fixing structure is a hook with an opening or a triangular, trapezoidal and semicircular cross section, and the corresponding oil filling exhaust valve is provided with a bulge or a groove with a triangular, trapezoidal and semicircular cross section.

The invention also provides a fuel tank, wherein the fuel tank comprises the vent structure for the fuel tank of the national six automobile, and the upper cover slot of the vent structure is assembled and connected with the plug in the fuel tank.

The invention achieves the following beneficial effects:

1) the technical scheme effectively combines the work exhaust and the refueling exhaust of the fuel tank into one exhaust port, reduces the connection with the carbon canister, and realizes the collection of refueling emission pollutants required by national six regulations.

2) The involute spiral wall, the baffle and the funnel-shaped bottom surface of the exhaust structure arrangement provided by the technical scheme effectively reduce the accumulation of liquid fuel in the exhaust system, reduce the pressure obstruction of the exhaust system and reduce the risk of the liquid fuel entering the carbon canister.

Drawings

The invention is further described with reference to the following figures and examples, which are provided for reference and illustration only and are not intended to be limiting of the invention.

FIG. 1 is a schematic view of a preferred embodiment of the venting structure and valve attachment of the present invention;

FIG. 2 is an internal schematic view of a preferred embodiment of the venting structure of the present invention;

FIG. 3 is a schematic cross-sectional view of a preferred embodiment of the venting structure of the present invention;

in the figure: 100. the structure comprises an upper cover, 110, a slot, 200, an upper cavity, 210, a main through hole, 220, an involute spiral wall, 230, a baffle, 240, a first buffer area, 250, a second buffer area, 260, a connector, 270, an auxiliary through hole, 280, an exhaust port, 290, a short wall, 300, a lower cavity, 310, a bracket, 311, a fixed structure and 400, an oil filling exhaust valve.

Detailed Description

[ example 1 ]

As shown in fig. 1 and 2: the technical scheme of the invention is as follows, which is used for the exhaust structure of the fuel tank of the national six automobiles and the fuel tank: comprises an upper cover 100, wherein the upper cover 100 is provided with a slot 110 connected with a fuel tank; the upper cover is hermetically welded with the upper cavity 200, and the bottom of the upper cavity 200 is provided with a main through hole 210 with a larger drift diameter; an involute spiral wall 220 with an involute spiral line projection is arranged in the upper cavity 200, and the involute spiral wall 220 gradually opens outwards around the main through hole 210; a baffle 230 is disposed in the upper chamber 200, and the baffle 230 is connected with the involute spiral wall 220 to divide the upper chamber 200 into two regions: a first buffer area 240 for work exhaust buffering; the second buffer area 250 is used for oil filling and exhaust buffering, the first buffer area 240 and the second buffer area 250 are not directly communicated in the upper cavity 200, and an interface 260 is arranged on the side surface of the first buffer area 240 and used for being connected with a working exhaust valve; the first buffer area 240 is provided with a secondary through hole 270 with a smaller drift diameter; an exhaust port 280 is arranged at the side edge of the second buffer area 250 and is used for connecting a carbon canister; the second buffer area 250 is provided with a lower short wall 290, the short wall 290 surrounds the inlet of the exhaust port 280, so that the second buffer area 250 and the exhaust port 280 are communicated only from the upper part of the short wall 290; a lower cavity 300 is arranged below the upper cavity 200, two sides of the side wall of the lower cavity 300 extend downwards to form a bracket 310, and the bracket 310 is provided with a fixing structure 311 for fixing the refueling exhaust valve 400; the side wall of the lower cavity 300 and the top of the refueling exhaust valve 400 surround to form the inner space of the lower cavity 300.

The path distribution of the refueling exhaust and the working exhaust is as follows: the gas-liquid mixed gas enters the lower cavity 300 from the refueling vent valve 400 in the refueling process, the pressure of the gas-liquid mixed gas is released due to the enlarged space, the liquid in the gas-liquid mixed gas sinks under the gravity and can flow back to the fuel tank through the refueling vent valve 400, the gas in the gas-liquid mixed gas rises and passes through the main through hole 210, the pressure and the separated liquid are further released through the second buffer area 250, and finally the gas reaches the vent port 280 from the upper part of the short wall and is discharged into the carbon canister, and the liquid flows back through the main through hole 210; the gas-liquid mixture in the working exhaust process enters the first buffer area 240 through the interface 260 to realize pressure relief, enters the lower cavity 300 through the auxiliary through hole 270, then upwards converges to the refueling exhaust channel through the main through hole 210 to be discharged outwards, and the liquid therein reaches the lower cavity 300 through the auxiliary through hole 270 under the influence of gravity and further flows back to the fuel tank through the refueling exhaust valve 400.

[ example 2 ]

As shown in fig. 1: the top of the slot 110 of the upper cover 100 is provided with a positioning hole for limiting the insertion position of the upper cover 100 and the fuel tank during installation, and the drawing force of the assembly structure is increased, so that the whole exhaust structure is reliably fixed in the fuel tank.

[ example 3 ]

As shown in fig. 1 and 2: the bottom of the upper cavity 200 is a smooth curved surface and has only one lowest point, which presents a funnel shape, the lowest point of the funnel shape is the main through hole 210, so that liquid is not easy to accumulate at the bottom of the upper cavity 200, and can flow back to the inside of the fuel tank through the main through hole 210.

[ example 4 ]

As shown in fig. 3: the upper cavity 200 may be a combined shape of a cylinder and an inverted cone, and the main through hole 210 is arranged at the vertex of the inverted cone, so that on one hand, the main through hole can be coaxially assembled with the refueling vent valve 400 similar to a cylinder, so that the assembled refueling vent valve 400 is uniformly stressed, and on the other hand, liquid can quickly flow back into the fuel tank through the main through hole 210.

[ example 5 ]

As shown in fig. 2: the involute spiral wall 220 rotates at least 360 degrees around the axis thereof, and the baffle plates 230 are distributed near the beginning and end sections of the involute spiral wall, so that the first buffer area 240 has a longer passage, and gas-liquid mixed gas entering from the interface 260 has enough space to release pressure during working and exhausting, and liquid is separated.

[ example 6 ]

As shown in fig. 2: the auxiliary through hole 270 is close to the minimum radius of the involute spiral wall 220 in the first buffer area 240, so that in the first buffer area 240, liquid can reversely flow back to the fuel tank along the involute spiral wall 220 through the auxiliary through hole 270 and is not easy to accumulate, and as the radius of the involute spiral wall 220 is gradually increased, the liquid is easy to flow back to an area with a smaller radius, the liquid is not easy to accumulate in the first buffer area 240, and the smoothness of a gas exhaust channel is kept.

[ example 7 ]

As shown in fig. 2: on the basis of the above embodiment 6, the interface 260 is arranged on the other side of the channel in the first buffer area 240 opposite to the secondary through hole 270, so that the gas-liquid mixture gas coming out from the interface 260 passes through the longest channel, and the back pressure of the working exhaust channel is relieved due to the pressure release caused by the diameter change of the channel.

[ example 8 ]

As shown in fig. 1 and 3: the fixing structure 311 is an open hole or a hook with a triangular, trapezoidal and semicircular cross section, and the corresponding oil filling exhaust valve 400 is provided with a protrusion or a groove with a triangular, trapezoidal and semicircular cross section, so that the valve can be reliably fixed with the exhaust structure, and connecting pipelines are reduced.

[ example 9 ]

The invention also provides a fuel tank, wherein the fuel tank comprises the vent structure for the fuel tank of the national six automobile, the upper cover slot of the vent structure is assembled and connected with the inner plug of the fuel tank, so that the fuel tank meets the requirement of refueling pollutant collection of national six regulations, the pressure in a vent system is reduced, the smoothness of a vent channel is kept, and the risk of liquid entering the carbon canister is reduced.

The present invention can also combine two or more selected technical features from the above embodiments 2-8 with embodiment 1 or embodiment 9 to form a new implementation.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention. In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.

Claims

1. A exhaust structure and fuel tank for six car fuel tanks in nation: comprises an upper cover, wherein the upper cover is provided with a slot connected with a fuel tank; the upper cover is hermetically welded with the upper cavity, and the bottom of the upper cavity is provided with a main through hole with a larger drift diameter; an involute spiral wall projected as an involute spiral line is arranged in the upper cavity, and the involute spiral wall gradually opens outwards around the main through hole; the baffle is arranged in the upper cavity body, and the baffle is connected with the involute spiral wall to divide the upper cavity body into two areas: the first buffer area is used for buffering working exhaust; the second buffer area is used for oiling and exhausting for buffering, the first buffer area and the second buffer area are not directly communicated in the upper cavity, and an interface is arranged on the side surface of the first buffer area and is used for being connected with a working exhaust valve; the first buffer area is provided with auxiliary through holes with smaller drift diameters; an exhaust port is arranged on the side edge of the second buffer area and is used for connecting a carbon tank; the second buffer area is provided with a lower short wall which surrounds the inlet of the air outlet, so that the second buffer area and the air outlet are communicated only from the upper part of the short wall; a lower cavity is arranged below the upper cavity, two sides of the side wall of the lower cavity extend downwards to form a support, and the support is provided with a fixing structure for fixing an oil filling exhaust valve; the side wall of the lower cavity and the top of the oil filling exhaust valve surround to form the inner space of the lower cavity.

2. The venting structure and fuel tank for a fuel tank of a sixty-country vehicle according to claim 1, wherein the insertion groove of the upper cover is disposed with a positioning hole.

3. The venting structure and fuel tank of claim 1 wherein the bottom of the upper cavity is smoothly curved and has only one lowest point, and the lowest point of the funnel shape is the main through hole.

4. The venting structure and fuel tank for a fuel tank of a domestic six automobile according to claim 1, wherein the upper cavity is in the shape of a combination of a cylinder and an inverted cone, and the main through hole is arranged at the apex of the inverted cone.

5. The venting structure and fuel tank as claimed in claim 1, wherein the involute spiral wall turns at least 360 degrees around its axis, and the baffles are distributed near the beginning and end of the involute spiral wall to allow the first buffer zone to have a longer passage.

6. The venting structure and fuel tank as claimed in claim 1, wherein the secondary through hole is located near the smallest radius of the involute spiral wall in the first buffer area.

7. The venting structure and fuel tank for a fuel tank of a sixty-country vehicle of claim 6, wherein the interface is disposed on the other side of the passage in the first buffer area opposite the secondary through hole.

8. The venting structure and fuel tank for a fuel tank of a domestic six automobile as claimed in claim 1, wherein the fixing structure is a hook with an opening or a triangular, trapezoidal or semicircular cross section, and the corresponding refueling vent valve is provided with a protrusion or a groove with a triangular, trapezoidal or semicircular cross section.

9. A fuel tank comprising the vent structure for a fuel tank of a domestic six vehicle as claimed in any one of claims 1 to 8, wherein said vent structure has a cap-receiving slot for fitting into said fuel tank plug.