CN209838560U - Carbon tank - Google Patents

Abstract

The utility model provides a carbon tank, it includes: the carbon tank comprises a carbon tank main body, wherein the carbon tank main body is provided with an accommodating space for accommodating an adsorbing material, the accommodating space is provided with a head end and a tail end in an adsorbing direction, the carbon tank main body is provided with an adsorbing port and a desorbing port, the adsorbing port and the desorbing port are positioned at the head end, the carbon tank main body is provided with a cavity, the cavity is positioned at the tail end, and the cavity is provided with a first vent communicated with the atmosphere; the electromagnetic valve is arranged in the cavity and used for controlling the opening and closing of the first air vent, the cavity is provided with an installation port for the electromagnetic valve to be installed, the installation port is provided with a clamping portion, the electromagnetic valve is provided with a buckle, and the electromagnetic valve is installed in the cavity through the cooperation of the buckle and the clamping portion. The utility model discloses a carbon tank is owing to saved the pipeline among the prior art, consequently saves installation space, and reduce cost is and when avoiding the carbon tank desorption the oil tank is inhaled flat or is damaged.

Description

Carbon tank

Technical Field

The utility model relates to a fuel evaporation control system of car, concretely relates to carbon tank.

Background

In the regulations of the limit of emission of pollutants for light vehicles and the measurement method (sixth stage of china) released recently, the requirement for monitoring the sealing performance of an evaporation control system by an OBD system (on-board diagnostic system) is added, so that parts of the corresponding OBD system are added to the vehicle.

Fig. 1 shows a canister of the related art, which includes a canister body 10, an ash filter 20, a solenoid valve 30, and a pipe 40. The carbon tank main body 10 comprises an adsorption port 101, a desorption port 102 and an atmosphere port 103 of the carbon tank, and the ash filter 20 comprises a carbon tank port 201 and an atmosphere port 202 of the ash filter. The canister body 10 is arranged spaced apart from the ash filter 20, and the solenoid valve 30 is connected to the atmospheric vent 103 of the canister and the carbon canister port 201 of the ash filter, respectively, through the pipe 40.

In the above prior art, because the carbon canister needs to consider the direction of the pipeline 40, the pipeline 40 is prevented from interfering with other parts, and the carbon canister body 10, the ash filter 20 and the electromagnetic valve 30 need to be fixed to the vehicle body, the carbon canister needs to occupy a larger installation space and use a longer pipeline 40 to connect the parts, and the cost of the pipeline 40 increases. The components to which the conduit 40 is connected also need to be connected by a crossover joint, resulting in an increased number of ports and an increased risk of seal leakage. The longer path of the entire canister conduit 40 increases the desorption resistance of the system, and as the canister desorbs, the greater negative pressure generated by the engine may be replenished from the tank, which may result in the tank being deflated or damaged.

In another prior art, the solenoid valve is connected to the canister body, but the solenoid valve easily drops from the canister body during transportation, and the solenoid valve protrudes from the surface of the canister body, so that the solenoid valve is more easily damaged during installation and use.

SUMMERY OF THE UTILITY MODEL

Based on the problem of above-mentioned prior art, the utility model aims at providing a carbon tank, it can save installation space, and reduce cost reduces the risk of sealed leakage, and the oil tank is inhaled flat or is damaged when avoiding the carbon tank desorption to and make the solenoid valve connect reliably simple to operate.

The utility model provides a carbon tank, carbon tank includes:

the carbon tank comprises a carbon tank main body, wherein the carbon tank main body is provided with an accommodating space for accommodating an adsorbing material, the accommodating space is provided with a head end and a tail end in an adsorbing direction, the carbon tank main body is provided with an adsorbing port and a desorbing port, the adsorbing port and the desorbing port are positioned at the head end of the accommodating space in the adsorbing direction, the carbon tank main body is provided with a cavity, the cavity is positioned at the tail end of the accommodating space in the adsorbing direction, and the cavity is provided with a first vent communicated with the atmosphere;

the solenoid valve, the solenoid valve set up sealingly in the cavity for control the switching of first blow vent, the cavity is equipped with the confession the installing port that the solenoid valve was packed into, the installing port is provided with joint portion, the solenoid valve is provided with the buckle, through the buckle with joint portion cooperation makes the solenoid valve install in the cavity.

Preferably, the carbon tank further comprises a first housing for accommodating the filter element, and the first housing is provided with a second vent;

the cavity is provided with a second shell surrounding the first vent hole on the outer wall, and the first shell and the second shell are mutually matched and are in sealing connection, so that the first vent hole and the second vent hole are separated by the filter element.

Preferably, the cavity is cylindrical, the axial direction of the cavity extends along the direction of the adsorption airflow or the desorption airflow, and one axial end of the cavity is open to form the mounting port;

the clamping portion comprises a guide surface which faces back to the cavity along the axial direction of the cavity, the guide surface comprises a straight section and an inclined section which are connected with each other, the straight section extends along the circumferential direction of the cavity, the inclined section is inclined relative to the straight section and is positioned at one end of the straight section in the circumferential direction, the inclined section tends to the straight section more and more towards the axial front side of the cavity, and the electromagnetic valve is installed into the cavity from the axial rear side to the axial front side of the cavity.

Preferably, the clamping portion comprises an elastic portion located on the radial outer side of the straight section, one end of the elastic portion is connected with the mounting port, and the other end of the elastic portion can elastically deform outwards along the radial direction;

the elastic part is provided with a convex block protruding towards the radial inner side, the convex block is provided with an inclined plane back to the cavity, the inclined plane tends to the axial front side of the cavity and tends to the radial inner side of the cavity, and the elastic part can elastically deform towards the radial outer side by pressing the buckle against the inclined plane.

Preferably, the projection is provided with another inclined surface facing the circumferential direction of the cavity, the inclined surface being more inclined toward the radially inner side of the cavity as the inclined section is more inclined, and the elastic portion is elastically deformable radially outward of the cavity by the snap being pressed against the other inclined surface.

Preferably, the buckle comprises a groove, the groove is provided with an opening facing the radial outer side of the electromagnetic valve, and the buckle and the clamping portion are matched and connected through the lug embedded in the groove.

Preferably, the buckle comprises a matching surface facing the guide surface along the axial direction of the cavity, and the matching surface and the guide surface are matched to enable the electromagnetic valve to move along the axial direction when the electromagnetic valve rotates along the circumferential direction of the cavity.

Preferably, the electromagnetic valve is circumferentially provided with a plurality of buckles, the plurality of buckles have different sizes, the clamping portion is circumferentially provided with a plurality of clamping portions, the plurality of clamping portions have different sizes, and therefore the electromagnetic valve is installed in the cavity in a uniquely determined posture through the cooperation of the buckles and the clamping portions.

Preferably, the inner diameter of the axial rear side of the cavity is smaller than the inner diameter of the axial front side, and the axial front side is provided with an axial positioning portion which axially limits the electromagnetic valve when the electromagnetic valve is installed in the cavity.

Through adopting the technical scheme, the utility model discloses a carbon tank is owing to saved the pipeline among the prior art, consequently can save installation space, and reduce cost reduces sealed risk of leaking and the oil tank is inhaled flat or is damaged when avoiding the carbon tank desorption.

In addition, through the clamping parts with different sizes and the corresponding buckling fit, the electromagnetic valve and the carbon tank body can be conveniently and reliably installed together.

Drawings

Fig. 1 shows a schematic view of a carbon canister of the prior art.

Fig. 2 shows an exploded view of a carbon canister according to an embodiment of the invention.

Fig. 3 shows a partial exploded view of a carbon canister according to an embodiment of the invention.

Fig. 4 shows a partial enlarged view of a canister body of a canister according to an embodiment of the present invention.

Fig. 5 shows a partial cross-sectional view of a carbon canister according to an embodiment of the invention.

Description of the reference numerals

10 carbon tank main body 101 adsorption port 102 desorption port 103 carbon tank vent to atmosphere port 20 ash filter 201 carbon tank port 202 ash filter vent to atmosphere port 30 solenoid valve 40 pipeline

1 carbon canister body 11 adsorption port 12 desorption port 13 cavity 14 second housing 141 positioning groove 15 first air vent 16 first clamping part 161 first guide surface 1611 first inclined section 1612 first flat section 162 first elastic part 163 first lug 164 first inclined plane 165 third inclined plane 17 second clamping part 171 second guide surface 1711 second inclined section 1712 second flat section 172 second elastic part 173 second lug 174 second inclined plane 175 fourth inclined plane

2 electromagnetic valve 21 valve body 211 sealing ring 212 conical positioning part 22 valve core 23 valve plate 24 third vent 25 inlet 26 outlet 27 first catch 271 first groove 28 second catch 281 second groove

3 filter element 31 filter paper 32 baffle 33 positioning boss

4 first casing 41 second vent

The near canister side S2 of S1 is near the atmosphere side.

Detailed Description

Exemplary embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the detailed description is only intended to teach one skilled in the art how to practice the invention, and is not intended to exhaust all possible ways of practicing the invention, nor is it intended to limit the scope of the invention.

Unless otherwise specified, in the following description, the axial direction refers to the axial direction of the cavity 13, the circumferential direction refers to the circumferential direction of the cavity 13, and the radial direction refers to the radial direction of the cavity 13. The direction in which the solenoid valve 2 is fitted into the cavity 13 is the axial front side, and the direction in which the solenoid valve 2 is removed from the cavity is the axial rear side.

As shown in fig. 2 to 5, the utility model provides a carbon tank, which comprises a carbon tank main body 1, a solenoid valve 2, a filter element 3 and a first shell 4.

As shown in fig. 2 to 4, the canister body 1 is provided with an adsorption port 11 and a desorption port 12, the adsorption port 11 can be used for connecting an oil tank of an automobile, and the desorption port 12 can be used for connecting an engine of the automobile. The inside of carbon canister main part 1 has the accommodation space that can be used to hold the active carbon, and this accommodation space is used for the splendid attire active carbon, and the active carbon has good adsorption, can be used for adsorbing fuel steam molecule. It will be appreciated that although the containment space is referred to above as containing activated carbon, the invention may also be used with other adsorbent materials instead of, or in part instead of, activated carbon.

Accommodation space has the ascending head end of absorption direction and tail end, adsorbs mouthful 11 and desorption mouth 12 and all communicates accommodation space's head end.

The carbon tank main body 1 is formed with a cavity 13, the cavity 13 is located the tail end of the accommodating space in the adsorption direction, and a first vent 15 communicated with the atmosphere is formed in the cavity 13. The cavity 13 is hermetically provided with a solenoid valve 2, and the opening and closing of the first vent 15 can be controlled by the solenoid valve 2. The cavity 13 may be cylindrical, one axial end of the cavity 13 is provided with a mounting port into which the electromagnetic valve 2 is fitted, and the other axial end of the cavity 13 may be communicated with the accommodating space of the canister body 1 containing the activated carbon. A second housing 14 surrounding the first vent 15 is provided on the outer wall of the cavity 13, and the first housing 4 and the second housing 14 are fitted and hermetically connected to each other. The filter element 3 is accommodated in the first housing 4, the first housing 4 is provided with a second vent 41, and the first vent 15 and the second vent 41 are spaced apart from each other by the filter element 3.

The utility model discloses a carbon tank is arranged in the OBD system, opens at the first blow vent 15 of OBD system stop work time solenoid valve 2 control, closes at the first blow vent 15 of OBD system during operation solenoid valve 2 control.

When the carbon canister adsorbs, first vent 15 is opened, and fuel vapor gets into the inside of carbon canister main part 1 from the absorption mouth 11 of carbon canister main part 1, and fuel vapor leads to the tail end by accommodation space's head end, is discharged by second vent 41 through first vent 15. When the carbon tank is desorbed, the first vent 15 is opened, negative pressure is generated near the desorption port 12, air enters the inside of the carbon tank main body 1 from the second vent 41 through the first vent 15, the air is led to the head end from the tail end of the accommodating space, and the air is discharged out of the carbon tank from the desorption port 12 and enters the engine.

As an embodiment, the radial dimension of the cavity 13 may not be constant along the axial direction of the cavity 13, for example, in the region for accommodating the solenoid valve 2, the radial dimension of the cavity 13 is gradually reduced in the direction in which the solenoid valve 2 is installed in the cavity 13 (in the direction from the axial rear side of the cavity 13 to the axial front side), so that the inner wall of the cavity 13 gradually shrinks to form a cone shape. The solenoid valve 2 is accommodated in a portion near the mounting opening of the cavity 13 in the axial direction of the cavity 13. The conical inner wall surface can act as a stop for the solenoid valve 2 when the solenoid valve 2 is inserted into the cavity 13.

The mounting opening of the cavity 13 is circumferentially provided with a plurality of clamping portions (such as a first clamping portion 16 and a second clamping portion 17) with different sizes, each clamping portion comprises a guide surface (such as a first guide surface 161 and a second guide surface 171) and an elastic portion (such as a first elastic portion 162 and a second elastic portion 172), each elastic portion is elastically connected with the carbon tank main body 1, and the electromagnetic valve 2 can be connected to the carbon tank main body 1 through the matching of the clamping portions and the electromagnetic valve 2. The guide surface includes an inclined section including a first inclined section 1611 and a second inclined section 1711, and a flat section including a first flat section 1612 and a second flat section 1712. The elastic part includes a bump (e.g., a first bump 163 and a second bump 173). The projection is provided with a ramp (first ramp 164 and second ramp 174) and another ramp (third ramp 165 and fourth ramp 175).

Specifically, the side wall of the mounting opening of the cavity 13 is provided with a first snap-in portion 16 and a second snap-in portion 17. The first and second clip portions 16 and 17 may have different sizes, for example, the circumferential size of the first clip portion 16 is larger than the circumferential size of the second clip portion 17. In other embodiments of the present invention, the first clip portion 16 and the second clip portion 17 may have different shapes so that the first clip portion 16 can be mated with the first catch 27 and the second clip portion 17 can be mated with the second catch 28, but cannot be interchangeably universally mated.

The first clamping portion 16 includes a first guide surface 161 and a first elastic portion 162, one circumferential end of the first elastic portion 162 is connected with the mounting opening, and the other end can be elastically deformed radially outward. The first elastic portion 162 is provided with a first projection 163 projecting toward the radially inner side, and the first projection 163 is provided with a first slope 164 facing away from the cavity 13, the first slope 164 being more toward the radially inner side of the cavity 13 as the first slope 164 is more toward the axially front side of the cavity 13. For example, when the solenoid valve 2 is axially inserted into the cavity 13, the solenoid valve 2 abuts against the first inclined surface 164 to elastically deform the first projection 163 radially outward. First guide surface 161 includes first inclined section 1611 and first straight section 1612 connected to each other, and first inclined section 1611 is located more toward first straight section 1612 than toward the axial front side of cavity 13. The first elastic portion 162 is located radially outward of the first straight section 1612. A first straight section 1612 is connected to one side of the first inclined section 1611 in the circumferential direction, the first straight section 1612 extending in the circumferential direction of the cavity 13 and being perpendicular to the axial direction of the cavity 13. In short, first inclined section 1611 is inclined with respect to first flat section 1612 and first flat section 1612 is located axially forward of first inclined section 1611. For example, the solenoid valve 2 moves from the first straight section 1612 to the first inclined section 1611 in the circumferential direction of the cavity 13, while the solenoid valve 2 moves rearward in the axial direction by being guided by the first inclined section 1611.

The second engaging portion 17 includes a second guide surface 171 and a second elastic portion 172, one circumferential end of the second elastic portion 172 is connected to the mounting opening, and the other end is elastically deformable radially outward. The second elastic portion 172 is provided with a second projection 173 projecting toward the radially inner side, and the second projection 173 is provided with a second inclined surface 174 facing away from the cavity 13, the second inclined surface 174 being more toward the radially inner side of the cavity 13 toward the axially front side of the cavity 13. For example, when the solenoid valve 2 is axially inserted into the cavity 13, the solenoid valve 2 abuts against the second inclined surface 174 to elastically deform the second boss 173 radially outward. The circumferential dimension of the first bump 163 is greater than the circumferential dimension of the second bump 173. The second guide surface 171 includes a second inclined section 1711 and a second straight section 1712 connected to each other, and the second inclined section 1711 is more inclined toward the axial front side of the cavity 13 than the second straight section 1712. The second elastic portion 172 is located radially outward of the second straight section 1712. The second straight section 1712 is connected to one side of the second inclined section 1711 in the circumferential direction, and the second straight section 1712 extends in the circumferential direction of the cavity 13 and is perpendicular to the axial direction of the cavity 13. In short, the second inclined segment 1711 is inclined with respect to the second straight segment 1712 and the second straight segment 1712 is located axially forward of the second inclined segment 1711. For example, the solenoid valve 2 moves from the second straight section 1712 to the second inclined section 1711 in the circumferential direction of the cavity 13, while the solenoid valve 2 moves rearward in the axial direction by being guided by the second inclined section 1711.

As shown in fig. 2, 3 and 5, the electromagnetic valve 2 includes a valve body 21, a valve core 22, a valve plate 23, a third vent hole 24, an air inlet 25 and an air outlet 26, and the valve body 21 is generally cylindrical. The third vent port 24 is located inside the valve body 21. In the direction of the air flow through the solenoid valve 2, the air inlet 25 and the air outlet 26 are located on both sides of the third vent 24, the air inlet 25 is located at the front end of the valve body 21, and the air outlet 26 is located on the side wall of the valve body 21. The air inlet 25 communicates with the accommodating space, and the air outlet 26 communicates with the first air vent 15. Magnetic force can make valve core 22 drive valve sheet 23 and remove, makes valve sheet 23 shelter from third vent 24. The electromagnetic valve 2 is in a normally open state, when the electromagnetic valve 2 is not electrified, the valve plate 23 does not shield the third vent 24, so that the air inlet 25 is communicated with the air outlet 26, and when the electromagnetic valve 2 is electrified, the valve plate 23 shields the third vent 24, so that the air inlet 25 is separated from the air outlet 26.

The valve body 21 may be sleeved with a sealing ring 211, the sealing ring 211 is located at two ends of the air outlet 26, for example, two axial ends of the valve body 21 are respectively sleeved with an O-ring 211, and the valve body 21 and the inner side wall of the cavity 13 can form a seal by the two O-rings 211.

The front end of the valve body 21 is provided with a conical positioning portion 212, the diameter of the conical positioning portion 212 decreases toward the axial front end of the electromagnetic valve 2, and the conical positioning portion 212 is matched with the conical inner wall surface of the cavity 13, so that when the electromagnetic valve 2 is installed in the cavity 13, the axial limiting effect on the electromagnetic valve 2 can be achieved.

The solenoid valve 2 is provided with a plurality of different sized catches (e.g., a first catch 27 and a second catch 28) in the circumferential direction, the catches having grooves (e.g., a first groove 271 and a second groove 281) that accommodate the projections of the catching portions. For example, the solenoid valve 2 is provided with a first catch 27 and a second catch 28, both the first catch 27 and the second catch 28 being provided at the rear end portion of the valve body 21, the first catch 27 and the second catch 28 being spaced apart in the circumferential direction of the solenoid valve 2. The first catch 27 has a first recess 271 and the second catch 28 has a second recess 281. The first groove 271 and the second groove 281 open toward the radially outer side of the solenoid valve 2. Specifically, the circumferential dimension of the first catch 27 is greater than the circumferential dimension of the second catch 28, and the circumferential dimension of the first groove 271 is greater than the circumferential dimension of the second groove 281. When the solenoid valve 2 is mounted to the canister body 1, the first boss 163 is received in the first recess 271, and the second boss 173 is received in the second recess 281. It is to be understood that the different dimensions are not limited to circumferential dimensions but may also be radial dimensions.

Referring to fig. 3, for example, the first and second grooves 217 and 281 are respectively defined by two circumferential side walls and a bottom wall near the axial front side. The circumferential side wall may achieve circumferential limitation with the first and second bosses 163, 173 and the bottom wall may achieve axial limitation with the first and second bosses 163, 173.

The first catch 27 has a first mating face (front surface) facing the first guide face 161 in the axial direction of the cavity 13, and the second catch 28 has a second mating face (front surface) facing the second guide face 171 in the axial direction of the cavity 13. When the solenoid valve 2 is mounted to the canister body 1, at least a portion of the first mating surface opposes the first straight section 1612 of the first guide surface 161, and at least a portion of the second mating surface opposes the second straight section 1712 of the second guide surface 171.

When the solenoid valve 2 is connected with the canister body 1, the solenoid valve 2 is axially installed in the cavity 13, the first buckle 27 corresponds to the first clamping portion 16, the second buckle 28 corresponds to the second clamping portion 17, the force is applied to the solenoid valve 2 along the axial direction of the solenoid valve 2 to enable the first buckle 27 to press against the first inclined surface 164 of the first bump 163, and the second buckle 28 presses against the second inclined surface 174 of the second bump 173. Thereby elastically deforming the first elastic portion 162 and the second elastic portion 172 radially outward, the first mating surface presses against the first straight section 1612 of the first guide surface 161, and the second mating surface presses against the second straight section 1712 of the second guide surface 171. After the solenoid valve 2 is mounted in place, the first protrusion 163 is inserted into the first recess 271, and the second protrusion 173 is inserted into the second recess 281.

When the solenoid valve 2 is axially installed in the cavity 13, even if the first catch 27 is not completely aligned with the first catch portion 16 and the second catch 28 is not completely aligned with the second catch portion 17, the force is applied to the solenoid valve 2 in the axial direction of the solenoid valve 2 to press the first catch 27 against the first inclined surface 164 of the first protrusion 163 and the second catch 28 against the second inclined surface 174 of the second protrusion 173, so that after the first elastic portion 162 and the second elastic portion 172 are elastically deformed radially outward, a portion of the first mating surface presses against the first inclined section 1611 of the first guiding surface 161, and a portion of the second mating surface presses against the second inclined section 1711 of the second guiding surface 171. Under the guidance of the first inclined section 1611 and the second inclined section 1711, the solenoid valve 2 is rotated clockwise in fig. 4 so that the first projection 163 can be easily fitted into the first recess 271, and the second projection 173 can be easily fitted into the second recess 281, so that the solenoid valve 2 is mounted in place.

It can be understood that two buckles with different sizes and two clamping parts with different sizes are adopted for matching, so that only the first buckle 27 and the first clamping part 16 can be matched, and the second buckle 28 and the second clamping part 17 can be matched in the assembling process of the electromagnetic valve 2. Therefore, the problem that the first air vent 15 and the air outlet 26 of the electromagnetic valve 2 cannot be aligned due to wrong installation angles of the electromagnetic valve 2 is avoided. When the solenoid valve 2 is rotated by the guiding action of the first guide surface 161 and the second guide surface 171, the solenoid valve 2 can be directly pressed and installed without aligning the first projection 163 with the first recess 271 and aligning the second projection 173 with the second recess 281.

The first projection 163 is also provided with a third inclined surface 165 (another inclined surface) facing the circumferential direction of the cavity 13, the further the third inclined surface 165 tends toward the first inclined section 1611, the further the radially inner side of the cavity 13. The second protrusion 173 is further provided with a fourth slope 175 (another slope) toward the circumferential direction of the cavity 13, the more the fourth slope 175 tends toward the radially inner side of the cavity 13 than the second slope 1711. When the solenoid valve 2 is detached from the canister body 1, rotating the solenoid valve 2 in the counterclockwise direction in fig. 4 may press the first catch 27 against the third inclined surface 165, press the second catch 28 against the fourth inclined surface 175, elastically deform the first elastic portion 162 and the second elastic portion 172 radially outward, withdraw the first protrusion 163 from the first recess 271, and withdraw the second protrusion 173 from the second recess 281. The first engagement surface engages with the first guide surface 161, and the second engagement surface engages with the second guide surface 171, so that the solenoid valve 2 moves backward in the axial direction of the solenoid valve 2 when rotated, and is withdrawn from the cavity 13. Through the cooperation of buckle and joint portion, can make solenoid valve 2 and carbon tank main part 1 convenient operation when installation and dismantlement.

In the present embodiment, the second housing 14 may be made of plastic.

As shown in fig. 2 and 3, the filter cartridge 3 includes a filter paper 31 and a partition 32, the partition 32 may be made of a plastic material, and the filter paper 31 and the partition 32 may be integrally injection-molded. The partition 32 is provided with a plurality of positioning bosses 33, for example, 4 positioning bosses 33 are provided at four corners of the partition 32. The second casing 14 is provided with a positioning groove 141, and the positioning boss 33 and the positioning groove 141 are matched, so that the filter element 3 can not shake in the first casing 4.

The filter cartridge 3 is located between the canister body 1 and the first housing 4. The first housing 4 is provided with a second vent 41, the atmospheric vent and the vent being located on either side of the cartridge. The first housing 4 and the second housing 14 can be made of plastic material, and the edges of the first housing 4 and the second housing 14 can be connected by vibration friction welding, so that the edges of the filter element 3 are also sealed, and the gas flowing between the two sides of the filter element 3 is filtered by the filter element 3.

At OBD system during operation, the utility model discloses a 2 circular telegrams of solenoid valve of carbon tank make case 22 drive valve block 23 and remove backward. The valve plate 23 closes the third vent 24, so that the air inlet 25 and the air outlet 26 of the electromagnetic valve 2 are isolated, thereby cutting off the communication between the evaporation control system and the atmosphere. Therefore, whether the leakage exists in the evaporation control system can be judged by detecting the pressure change value of the evaporation control system in a certain time.

At OBD system stop work time, the utility model discloses a 2 outage of solenoid valve of carbon tank, the position of case is as shown in FIG. 5, and the valve block does not have the blow vent that seals the solenoid valve, makes the air inlet and the gas outlet intercommunication of solenoid valve.

The gas flowing process of the carbon tank during adsorption and desorption and the working principle of the carbon tank when the OBD system stops working are described below. When the canister adsorbs, fuel vapor enters the interior of the canister body 1 from the adsorption port 11 of the canister body 1. The sucked fuel vapor may flow along an internal passage in the canister body 1, and in the process, fuel vapor molecules in the air flow may be adsorbed by the activated carbon inside the canister body 1. The gas adsorbed by the activated carbon enters the interior of the valve body 21 from the gas inlet 25 of the electromagnetic valve 2, passes through the third vent hole 24, and flows out from the gas outlet 26 on the side surface of the valve body 21. Then, the gas flow passes through the first vent hole 15 of the canister body 1 to the space enclosed by the first casing 4 and the second casing 14, the gas flow passes from the canister side S1 of the filter element 3 to the atmosphere side S2 of the filter element 3 after being filtered by the filter paper 31, and finally the gas is introduced into the atmosphere through the second vent hole 41 of the first casing 4.

When the canister is desorbed, negative pressure is generated by the engine near the desorption port 12. Air enters the canister through the second vent 41, and the air reaches the canister side S1 of the filter element 3 by being filtered by the filter paper 31 from the near-atmosphere side S2 of the filter element 3. The filter paper 31 can filter dust and impurities in the air, so that the dust and the impurities are prevented from entering the electromagnetic valve 2, and the electromagnetic valve 2 is not tightly sealed or loses efficacy due to accumulation inside the electromagnetic valve 2, so that the problem of gas leakage occurs during detection of an OBD system. The filtered gas enters the interior of the valve body 21 through the first vent 15 of the canister body 1 and the gas outlet 26 on the side of the solenoid valve, and then enters the interior of the canister body 1 through the third vent 24 and the gas inlet 25. The gas then flows along the passage in the canister body 1, in the process, the high-speed gas flow carries away the fuel vapor molecules stored in the pores of the activated carbon, and finally the fuel vapor molecules are desorbed to the engine through the desorption port 12 to be combusted.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (9)

1. A canister, comprising:

the carbon tank comprises a carbon tank main body (1), wherein the carbon tank main body (1) is provided with an accommodating space for accommodating an adsorbing material, the accommodating space is provided with a head end and a tail end in an adsorbing direction, the carbon tank main body (1) is provided with an adsorbing port (11) and a desorbing port (12), the adsorbing port (11) and the desorbing port (12) are located at the head end in the adsorbing direction of the accommodating space, a cavity (13) is formed in the carbon tank main body (1), the cavity (13) is located at the tail end in the adsorbing direction of the accommodating space, and a first vent hole (15) communicated with the atmosphere is formed in the cavity (13);

solenoid valve (2), solenoid valve (2) set up sealedly in cavity (13), be used for control the switching of first blow vent (15), cavity (13) are equipped with the confession solenoid valve (2) the installing port of packing into, the installing port is provided with joint portion, solenoid valve (2) are provided with the buckle, through the buckle with joint portion cooperation makes solenoid valve (2) install in cavity (13).

2. The canister according to claim 1, further comprising a first housing (4) for housing a filter element (3), the first housing (4) being provided with a second vent (41);

the cavity (13) is provided with a second shell (14) surrounding the first vent hole (15) on the outer wall, and the first shell (4) and the second shell (14) are mutually matched and connected in a sealing mode, so that the first vent hole (15) and the second vent hole (41) are separated through the filter element (3).

3. The canister according to claim 1, wherein the cavity (13) is cylindrical, the axial direction of the cavity (13) extends in the direction of the adsorption gas flow or the desorption gas flow, and one axial end of the cavity (13) is open to provide the mounting port;

the clamping portion comprises a guide surface which faces away from the cavity (13) along the axial direction of the cavity (13), the guide surface comprises a straight section and an inclined section which are connected with each other, the straight section extends along the circumferential direction of the cavity (13), the inclined section is inclined relative to the straight section and is positioned at one end of the straight section in the circumferential direction, the inclined section tends to the straight section more towards the axial front side of the cavity (13), and the electromagnetic valve (2) is installed into the cavity (13) from the axial rear side to the axial front side of the cavity (13).

4. The carbon canister of claim 3, wherein the clamping portion comprises an elastic portion located at a radial outer side of the straight section, one end of the elastic portion is connected with the mounting port, and the other end of the elastic portion can be elastically deformed radially outward;

the elastic part is provided with a convex block protruding towards the radial inner side, the convex block is provided with an inclined plane back to the cavity (13), the inclined plane tends to the axial front side of the cavity (13) and tends to the radial inner side of the cavity (13), and the elastic part can elastically deform towards the radial outer side by pressing the buckle against the inclined plane.

5. Carbon canister according to claim 4, characterised in that the projection is provided with a further bevel facing the circumference of the cavity (13), the further bevel being more inclined towards the radially inner side of the cavity (13) than the inclined section, the resilient portion being resiliently deformable radially outwardly of the cavity (13) by the snap being pressed against the further bevel.

6. The canister according to claim 4, wherein the catch comprises a recess with an opening facing radially outwards of the solenoid valve (2), the catch and the catch completing a mating connection by the projection engaging in the recess.

7. Canister according to claim 3, characterized in that the catch comprises a mating surface facing the guide surface in the axial direction of the cavity (13), by means of which mating surface and the guide surface the solenoid valve (2) can be moved in the axial direction when rotating in the circumferential direction of the cavity (13).

8. The canister according to any of the claims 1-7, characterized in that the snap is provided in plurality in the circumferential direction of the solenoid valve (2), the plurality of snaps having different sizes, the snap portion is provided in plurality in the circumferential direction of the side wall of the cavity (13), the plurality of snap portions having different sizes, so that the solenoid valve (2) is mounted to the cavity (13) in a uniquely determined posture by the snap and the snap portion cooperating.

9. Canister according to any of claims 1-7, characterized in that the cavity (13) has a smaller inner diameter on the axially rear side than on the axially front side and is provided with an axial positioning portion on the axially front side, which axially limits the solenoid valve (2) when the solenoid valve (2) is fitted into the cavity (13).