CN212106074U

CN212106074U - Filtering device and fuel evaporation control system

Info

Publication number: CN212106074U
Application number: CN202020674931.0U
Authority: CN
Inventors: 王志国; 陈胜晖
Original assignee: Mahle Automobile Technology China Co ltd
Current assignee: Mahle Automobile Technology China Co ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2020-12-08
Anticipated expiration: 2030-04-28

Abstract

The application provides a filter equipment and fuel evaporation control system for fuel evaporation control system, filter equipment includes: a housing; the end cover is connected with the shell, and a cavity is enclosed by the end cover and the shell; the filter element is arranged in the cavity, the cavity is divided into a first cavity and a second cavity by the filter element, the filter element comprises a filter element main body, and the filter element main body can enable gas to pass through and can filter impurities in the gas; and a check valve capable of allowing gas to pass therethrough in a one-way manner, the filter element main body and the check valve being provided in parallel. Through adopting above-mentioned technical scheme, filter equipment can be when the carbon tank desorption, and filtering quality does not receive the influence of check valve, and when the carbon tank adsorbs, the check valve can be opened, makes partial gas flow through the check valve, reduces filter equipment's resistance, makes the ride comfort of refueling good to and reduce the risk of refueling the in-process and jump the rifle many times.

Description

Filtering device and fuel evaporation control system

Technical Field

The application belongs to the field of automobiles, and particularly relates to a filtering device and a fuel evaporation control system.

Background

After implementation of the light vehicle pollutant emission limit and measurement method (sixth stage of china), the vehicle needs to be equipped with an OBD (on-board diagnostics) system to monitor the sealing performance of the fuel evaporation control system. In order to ensure that the on-board diagnostic element is not affected by dust in the atmosphere, the end of the fuel evaporation control system communicated with the atmosphere needs to be provided with a filtering device. However, because of the long path and the large number of components of the fuel evaporation system, the resistance of the gas passing through the fuel evaporation system is increased. When the automobile is refueled, in order to ensure the smoothness of refueling and reduce the risk of frequently jumping a gun during refueling, the resistance of a fuel evaporation system is reduced as much as possible. Therefore, it becomes particularly important to reduce the resistance to the passage of gas in the fuel evaporation system.

The prior art filter devices (ash filters) require filter paper to pass the gas as it passes from the canister to the atmosphere, but the gas passing to the atmosphere does not require filtering, and filter paper causes a large resistance to the passage of the gas through the filter device.

SUMMERY OF THE UTILITY MODEL

The application aims at providing a filter equipment and fuel evaporation control system for fuel evaporation control system, solves the problem that the resistance is great when gas passes through the fuel evaporation system and leads to the atmosphere and leads to the poor smoothness of refueling to and there is the problem of the risk of frequently jumping the rifle when refueling.

The application provides a fuel evaporation is filter equipment for control system, filter equipment includes:

a housing;

the end cover is connected with the shell, and a cavity is enclosed by the end cover and the shell;

the filter element is arranged in the cavity, the cavity is divided into a first cavity and a second cavity by the filter element, the filter element comprises a filter element main body, and the filter element main body can enable gas to pass through and can filter impurities in the gas; and

a one-way valve capable of one-way passage of gas, the cartridge body and the one-way valve being disposed in parallel, the one-way valve being constructed and arranged to:

when gas passes through the filter element from the first cavity to the second cavity, the one-way valve is closed, so that the gas passes from the first cavity to the second cavity through the filter element main body;

when gas passes through the cartridge from the second chamber to the first chamber, the one-way valve can be opened, allowing gas to pass from the second chamber to the first chamber via the cartridge body and the one-way valve.

Preferably, the filter element further comprises a bottom plate, the filter element main body and the one-way valve are both connected to the bottom plate, and the edge of the bottom plate is hermetically connected with the shell and the end cap.

Preferably, the check valve includes air vent, valve block and valve block installation department, the air vent set up in the bottom plate, the valve block connect in elastically the bottom plate the place side of first cavity, the valve block connect in the valve block installation department, the valve block installation department is located the next door of air vent, the valve block can cover completely the air vent.

Preferably, the valve plate installation portion includes the stand, the stand connect in the bottom plate, the valve plate is provided with the mounting hole, the valve plate passes through the mounting hole cover is located the stand, the radial dimension of stand is greater than the radial dimension of mounting hole.

Preferably, the valve plate installation portion further comprises an anti-release cap, one end of the stand column is connected to the bottom plate, the other end of the stand column is connected to the anti-release cap, and the radial size of the anti-release cap is larger than that of the stand column.

Preferably, the bottom plate is provided with a flat plate part, the flat plate part extends in the horizontal direction, the first cavity and the second cavity are respectively arranged on two sides of the flat plate part, the vent hole and the valve plate mounting part are formed in the flat plate part, and the valve plate is located above the flat plate part.

Preferably, the inner peripheral edge of the vent hole is provided with a support rib extending from the inner peripheral edge of the vent hole to the center of the vent hole.

Preferably, the shell is provided with a first interface communicated with the first cavity, and the end cover is provided with a second interface communicated with the second cavity.

The application also provides a fuel evaporation control system, which comprises the filtering device in any one of the technical schemes.

Preferably, the fuel evaporation control system further comprises a carbon tank and an on-board diagnostic element, the carbon tank is connected to the filtering device, the on-board diagnostic element is located between the carbon tank and the filtering device, the first cavity is communicated to the atmosphere through the first interface, and the second cavity is communicated with the carbon tank through the second interface.

Through adopting above-mentioned technical scheme, the fuel evaporation control system of this application can obtain at least one in following beneficial effect with filter equipment and fuel evaporation control system:

(1) through set up the check valve on filter equipment, when the carbon tank desorption, the check valve is closed, and gaseous can only pass through the filter core main part, and the on-vehicle diagnosis component of the air current after the filtration flows into the carbon tank, and filter equipment's filtering quality does not receive the influence of check valve.

(2) Through set up the check valve on filter equipment, when the carbon tank adsorbs, when the gas that has great flow passes through filter equipment from the carbon tank and gets into the atmosphere, the check valve can open. Part of gas flows through the one-way valve, so that the gas is prevented from only passing through the filter element main body, and the resistance of the filter device is greatly reduced. The smoothness of refueling is good, and the risk of gun jump for many times in the refueling process is reduced.

(3) The check valve is formed by using fewer parts, so that the structure of the check valve is simple, the occupied space is small, the arrangement space of the whole vehicle is saved, and the cost of the whole vehicle is reduced.

Drawings

Fig. 1 shows a schematic configuration diagram of a fuel evaporation control system according to an embodiment of the present application.

Fig. 2 shows an exploded schematic view of a filter device of a fuel evaporation control system according to an embodiment of the present application.

Fig. 3 shows a schematic view of a filter cartridge of a filter device of a fuel evaporation control system according to an embodiment of the present application.

Fig. 4 shows a cross-sectional view of a filter cartridge of a filter device of a fuel evaporation control system according to an embodiment of the present application.

Description of the reference numerals

100 filter device

200 vehicle-mounted diagnostic element

300 carbon tank

1 housing 11 first cavity 12 first interface

2 filter element 21 filter element main body 22 bottom plate 23 flat plate part

3 end cap 31 second cavity 32 second interface

4 one-way valve

41 air vent 411 support rib 412 sealing ring

42 valve sheet 421 mounting hole

43 sheet mount 431 post 432 drop off prevention cap 433 boss.

Detailed Description

In order to more clearly illustrate the above objects, features and advantages of the present application, a detailed description of the present application is provided in this section in conjunction with the accompanying drawings. This application is capable of embodiments in addition to those described herein, and is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this application pertains and which fall within the limits of the appended claims. The protection scope of the present application shall be subject to the claims.

As shown in fig. 1, the present application proposes a fuel evaporation control system, for example, a fuel evaporation control system of an automobile, which includes a filter device 100, an On Board Diagnostics (OBD) element 200, and a canister 300. The filter device 100, the on-board diagnostic element 200 and the canister 300 are connected in series, and in the fuel evaporation control system of the automobile, the filter device 100 is generally called an ash filter. During the desorption process, gas flows from the filter device 100 to the canister 300 through the on-board diagnostic element, and during the adsorption process, gas flows from the canister 300 to the filter device 100 through the on-board diagnostic element.

As shown in fig. 1 to 4, the present application also proposes a filter device 100, wherein the filter device 100 comprises a housing 1, a filter element 2 and an end cap 3, the housing 1 and the end cap 3 are hermetically connected together, for example, by vibration friction welding, and the housing 1 and the end cap 3 enclose a cavity. It is understood that the end cap 3 may be in the form of a half shell or a shell 1, and the shell 1 may be in the form of a half shell or an end cap, as long as the two enclose a cavity capable of accommodating the filter element 2, and the structures of the two are not particularly limited in the present application. The filter element 2 is arranged in the cavity, and the filter element 2 divides the cavity into a first cavity 11 and a second cavity 31.

As shown in fig. 1 and 2, the housing 1 is provided with a first port 12, and when the filter device 100 is connected to the fuel evaporation control system, the first chamber 11 is located on the atmosphere side, and the first chamber 11 is communicated to the atmosphere through the first port 12. The end cover 3 is provided with a second port 32, and when the filter device 100 is connected to a fuel evaporation control system, the second chamber 31 is located on the carbon canister side, and the second chamber 31 is communicated to the carbon canister 300 through the second port 32.

As shown in fig. 2 and 3, the filter element 2 includes a filter element main body 21 and a bottom plate 22, the bottom plate 22 is provided with the check valve 4, the filter element main body 21 and the check valve 4 are arranged in parallel, both the filter element main body 21 and the check valve 4 are connected to the bottom plate 22, and the edge of the bottom plate 22 is hermetically connected to the housing 1 and the end cap 3. Specifically, the cartridge body 21 may be filter paper, and the filter paper and the bottom plate 22 may be integrally formed by injection molding.

As shown in fig. 2 to 4, the check valve 4 includes a vent hole 41, a valve sheet 42, and a sheet mounting portion 43. A vent hole 41 is formed in the bottom plate 22, and the vent hole 41 communicates the first chamber 11 and the second chamber 31. The valve plate 42 is elastically connected to the first cavity 11 side of the base plate 22, and the valve plate 42 may have elasticity itself and/or the connection portion of the valve plate 42 and the base plate 22 may have elasticity. For example, the valve sheet 42 may be made of a rubber material. Specifically, the valve sheet mounting portion 43 is provided on the bottom plate 22, the valve sheet 42 is connected to the valve sheet mounting portion 43, the valve sheet mounting portion 43 is located beside the vent hole 41, and the valve sheet 42 can completely cover the vent hole 41.

The bottom plate 22 is provided with a flat plate portion 23, two sides of the flat plate portion 23 are respectively the first cavity 11 and the second cavity 31, and the flat plate portion 23 may be formed by protruding toward the first cavity 11. The vent hole 41 and the valve sheet mounting portion 43 are formed in the flat plate portion 23, the flat plate portion 23 extends in the horizontal direction, and the valve sheet 42 is positioned above the flat plate portion 23, so that the valve sheet 42 easily covers the vent hole 41 under the action of gravity.

The valve sheet 42 is provided with mounting holes 421, the valve sheet 42 is connected to the valve sheet mounting portion 43 through the mounting holes 421, and two mounting holes 421 may be provided.

Further, valve sheet mounting portion 43 includes a column 431 and an anti-drop cap 432, column 431 may be cylindrical, one end of column 431 is connected to flat plate portion 23, and the other end of column 431 is connected to anti-drop cap 432. The valve plate 42 is sleeved on the column 431 through the mounting hole 421, and the radial size of the column 431 is larger than that of the mounting hole 421 of the valve plate 42, so that the valve plate 42 is not easy to move when the valve plate 42 is sleeved on the column 431. The radial dimension of the anti-slip cap 432 is slightly larger than the radial dimension of the post 431. When the valve sheet 42 is mounted on the valve sheet mounting portion 43, the mounting hole 421 can be elastically deformed so that the separation prevention cap 432 passes through the mounting hole 421, and the separation prevention cap 432 can prevent the valve sheet 42 from separating.

The valve sheet mounting portion 43 may be provided in plural, for example, two, and the plural valve sheet mounting portions 43 may prevent the position of the valve sheet 42 after mounting from being deflected.

Further, the inner peripheral edge of the vent hole 41 is provided with a support rib 411, and the support rib 411 extends from the inner peripheral edge of the vent hole 41 toward the center of the vent hole 41. The support rib 411 can be used for supporting the valve plate 42, and when the air pressure of the first cavity 11 is too large, the support rib 411 can support the valve plate 42, so that the valve plate 42 is prevented from being excessively deformed or even damaged. It will be appreciated that excessive deformation or even damage to the valve plate 42 will result in failure of the check valve 4. The support rib 411 may be provided in plural number, for example, 3

When the canister 300 is desorbed, air outside the filter device 100 enters the first cavity 11 of the filter device 100 from the first port 12. Under the action of gravity, elastic force and air pressure, the valve sheet 42 is attached to the flat plate portion 23 to close the check valve 4. Then the air can only pass from the first cavity 11 to the second cavity 31 through the filter element main body 21, and the air filtered by the filter element main body 21 can pass through the on-board diagnostic element 200 and the carbon canister 300, so as to filter the dust in the air and prevent the on-board diagnostic element 200 from being damaged.

Further, the edge of the vent hole 41 may be provided with a ring of sealing ring 412 protruding toward the valve sheet 42, and the surface of the sealing ring 412 is smooth, so that the valve sheet 42 can be easily attached to the sealing ring 412 to seal the vent hole 41. The joint of the flat plate portion 23 and the pillar 431 is provided with a boss 433, and the upper surface of the boss 433 and the upper surface of the seal ring 412 are located on the same plane, so that the valve sheet 42 is easily attached to the seal ring 412 when the valve sheet is not subjected to an external force to keep the original shape.

When the fuel is supplied to the fuel tank or the temperature rises, the volume of the gas inside the fuel tank expands and the canister 300 performs an adsorption process. The hydrocarbon-removed gas adsorbed by the canister 300 enters the second chamber 31 of the filter device 100 from the second port 32.

If the air pressure in the second cavity 31 is small, the thrust force of the air pressure on the valve plate 42 is smaller than the gravity and the elastic force of the valve plate 42, and the check valve 4 is still closed, the air can only pass through the filter element main body 21 to pass from the second cavity 31 to the first cavity 11, and is diffused to the atmosphere through the first interface 12 communicated with the atmosphere.

If the air pressure of the second cavity 31 is larger, the thrust of the air pressure acting on the valve plate 42 is larger than the gravity and the elastic force of the valve plate 42, the elastically connected valve plate 42 tilts upwards, and the check valve 4 is opened. Gas can pass from the second chamber 31 to the first chamber 11 either through the cartridge body 21 or through the vent 41 of the one-way valve 4 and then to atmosphere through the first port 12. The larger the flow and/or flow rate of the gas entering the filter device 100 from the second connector 32 is, the larger the thrust on the valve plate 42 is, and the larger the gap where the valve plate 42 is tilted is, so that the resistance of the gas passing through the filter device 100 can be greatly reduced.

The filtering device and the fuel evaporation control system have the following beneficial effects:

(1) by providing the check valve 4 in the filter device 100, when the canister 300 is desorbed, the check valve 4 is closed, the gas can only pass through the filter element main body 21, the filtered air flows into the canister 300 through the on-vehicle diagnostic device 200, and the filter performance of the filter device 100 is not affected by the check valve 4.

(2) By providing the check valve 4 on the filter device 100, the check valve 4 can be opened when a large flow of gas passes from the canister 300 through the filter device 100 into the atmosphere when the canister 300 is adsorbed. Part of the gas flows through the check valve 4, avoiding the gas to pass through only the path of the cartridge body 21, thus greatly reducing the resistance of the filter device 100. The smoothness of refueling is good, and the risk of gun jump for many times in the refueling process is reduced.

(3) The check valve 4 is formed by using fewer parts, so that the check valve 4 is simple in structure and small in occupied space, the arrangement space of the whole vehicle is saved, and the cost of the whole vehicle is reduced.

Claims

1. A filter device for a fuel evaporation control system, characterized in that the filter device (100) comprises:

a housing (1);

the end cover (3), the end cover (3) and the shell (1) are connected together, and the end cover (3) and the shell (1) enclose a cavity;

the filter element (2) is arranged in the cavity, the cavity is divided into a first cavity (11) and a second cavity (31) by the filter element (2), the filter element (2) comprises a filter element main body (21), and the filter element main body (21) can enable gas to pass through and can filter impurities in the gas; and

a one-way valve (4), the one-way valve (4) being capable of one-way passage of gas, the cartridge body (21) and the one-way valve (4) being disposed in parallel, the one-way valve (4) being constructed and arranged to:

when gas passes through the filter element (2) from the first cavity (11) to the second cavity (31), the one-way valve (4) is closed, so that the gas passes from the first cavity (11) to the second cavity (31) through the filter element body (21);

when gas is passed from the second chamber (31) to the first chamber (11) through the cartridge (2), the one-way valve (4) can be opened, allowing gas to pass from the second chamber (31) to the first chamber (11) via the cartridge body (21) and the one-way valve (4).

2. The filtering device according to claim 1, characterized in that the cartridge (2) further comprises a bottom plate (22), the cartridge body (21) and the non-return valve (4) being connected to the bottom plate (22), the edges of the bottom plate (22) being sealingly connected with the casing (1) and the end cap (3).

3. The filter device according to claim 2, wherein the check valve (4) comprises a vent hole (41), a valve plate (42) and a valve plate installation portion (43), the vent hole (41) is formed in the bottom plate (22), the valve plate (42) is elastically connected to the side of the first cavity (11) of the bottom plate (22), the valve plate (42) is connected to the valve plate installation portion (43), the valve plate installation portion (43) is located beside the vent hole (41), and the vent hole (41) can be completely covered by the valve plate (42).

4. The filter device according to claim 3, wherein the valve plate mounting portion (43) comprises a column (431), the column (431) is connected to the bottom plate (22), the valve plate (42) is provided with a mounting hole (421), the valve plate (42) is sleeved on the column (431) through the mounting hole (421), and the radial dimension of the column (431) is larger than that of the mounting hole (421).

5. The filter device according to claim 4, wherein the valve sheet mounting portion (43) further comprises a separation prevention cap (432), one end of the pillar (431) is connected to the bottom plate (22), the other end of the pillar (431) is connected to the separation prevention cap (432), and the radial dimension of the separation prevention cap (432) is larger than that of the pillar (431).

6. The filtering device according to claim 3, wherein the bottom plate (22) is provided with a flat plate portion (23), the flat plate portion (23) extends in a horizontal direction, the first cavity (11) and the second cavity (31) are respectively disposed on two sides of the flat plate portion (23), the vent hole (41) and the valve sheet mounting portion (43) are formed in the flat plate portion (23), and the valve sheet (42) is located above the flat plate portion (23).

7. A filter device as claimed in claim 3, wherein an inner peripheral edge of the vent hole (41) is provided with a support rib (411), the support rib (411) extending from the inner peripheral edge of the vent hole (41) toward the center of the vent hole (41).

8. The filtering device according to any one of claims 1 to 7, characterized in that the housing (1) is provided with a first port (12), the first port (12) communicating with the first cavity (11), the end cap (3) being provided with a second port (32), the second port (32) communicating with the second cavity (31).

9. A fuel evaporation control system, characterized in that it comprises a filter device (100) according to any one of claims 1 to 8.

10. The fuel evaporation control system according to claim 9, further comprising a canister (300) and an on-board diagnostics unit (200), the canister (300) being connected to the filter device (100), the on-board diagnostics unit (200) being located between the canister (300) and the filter device (100), the first cavity (11) being open to the atmosphere via the first port (12), the second cavity (31) being open to the canister (300) via the second port (32).