JP2017089500A - Canister - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a canister capable of suppressing emission of fuel components to the atmosphere.SOLUTION: A passage capable of circulating a fluid is formed inside of a canister 1, an evaporated fuel introduction port 11 and a purge port 12 are disposed at one end side of the passage, and an atmospheric opening port 13 is disposed at the other end side of the passage. On the passage, a first chamber 21 accommodating a first adsorber 51 capable of adsorbing/desorbing an evaporated fuel, and a second chamber 22 accommodating a second adsorber 61 capable of adsorbing/desorbing the evaporated fuel are successively disposed from one end side, and the passage is constituted to be substantially horizontal in a state of being mounted on a vehicle. On the second chamber 22, a lower partitioning plate 68 for partitioning a lower side of the second chamber 22 in the state of being mounted on the vehicle is disposed at an atmospheric opening port 13 side of the second adsorber 61, and an upper partitioning plate 69 for partitioning an upper side of the second chamber 22 in the state of being mounted in the vehicle is disposed at an anti-atmospheric opening port 13 side of the second adsorber 61.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a canister that is mounted on a vehicle such as an automobile and that adsorbs and desorbs evaporated fuel.

  Patent Document 1 discloses a canister that adsorbs and desorbs evaporated fuel. This canister is formed with a passage through which fluid can flow, and at one end of the passage, an evaporative fuel introduction port for introducing evaporative fuel from the fuel tank and a purge port for communicating the intake passage of the engine And an air release port communicating with the atmosphere is provided on the other end side of the passage. In addition, on the passage, in order from the one end side, a first chamber in which a first adsorbent capable of adsorbing and desorbing evaporated fuel is housed, and a second adsorbent capable of adsorbing and desorbing evaporated fuel And a second chamber in which is accommodated.

  Such a canister is often mounted on a vehicle in a posture in which the passage is horizontal as disclosed in Patent Document 2 due to the convenience of in-vehicle layout.

JP2015-117603A JP 2014-208518 A

  In a canister having a configuration as described in Patent Document 1, the fuel component adsorbed by the adsorbent in the first chamber and the second chamber is typically desorbed using the negative pressure in the intake passage during engine operation. The purge introduced into the intake passage is performed.

  During purging, the fuel component adsorbed by the adsorbent in the first chamber and the second chamber moves toward the intake passage due to the negative pressure in the intake passage. For example, the fuel adsorbed by the second adsorbent in the second chamber moves to the first chamber side. On the other hand, when the engine is stopped and purge is not performed, the negative pressure in the intake passage disappears, and the fuel component adsorbed (remaining) in the adsorbent in the first chamber and the second chamber is taken into the intake air. While it does not move to the passage side, it moves downward in the adsorbent by gravity.

  In such a state where the purge is not performed, a propulsive force that tries to keep the fuel component concentration in equilibrium works inside the adsorbent in the first chamber and the second chamber. For example, when the fuel component remaining in the second adsorbent in the second chamber reaches a certain concentration or higher, the fuel component is propelled toward the atmosphere opening port in the second adsorbent. The fuel component that has reached the end of the second adsorbent on the atmosphere release port side may be released from the atmosphere release port.

  An object of the present invention is to provide a canister capable of suppressing the release of fuel components into the atmosphere.

The invention according to claim 1 of the present application is
A canister mounted on a vehicle that adsorbs and desorbs evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port for introducing evaporative fuel from the fuel tank and a purge port for communicating with the intake passage of the engine are provided on one end side of the passage,
At the other end of the passage, an air release port communicating with the atmosphere is provided,
A first chamber in which a first adsorbent capable of adsorbing and desorbing evaporated fuel and a second adsorbent capable of adsorbing and desorbing evaporated fuel are accommodated in order from the one end side on the passage. A second chamber is provided,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the second chamber, a lower partition plate for partitioning the lower side of the second chamber in a vehicle-mounted state is provided on the atmosphere release port side of the second adsorbent, and the anti-atmosphere of the second adsorbent. An upper partition plate that partitions the upper side of the second chamber when the vehicle is mounted is provided on the open port side.

The invention according to claim 2 of the present application is the invention according to claim 1,
A plurality of the second adsorbents are accommodated in the second chamber,
In the second chamber, the second adsorbent and the space are alternately arranged in the extending direction of the passage,
The lower partition plate and the upper partition plate are provided corresponding to each of the second adsorbents.

The invention according to claim 3 of the present application is the invention according to claim 2,
The plurality of second adsorbents adsorb vaporized fuel on the second adsorbent located on the atmosphere open port side in the extending direction of the passage than on the second adsorbent located on the anti-atmosphere open port side. It is configured to increase ability.

Invention of Claim 4 of this application is
A canister mounted on a vehicle that adsorbs and desorbs evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port for introducing evaporative fuel from the fuel tank and a purge port for communicating with the intake passage of the engine are provided on one end side of the passage,
At the other end of the passage, an air release port communicating with the atmosphere is provided,
On the passage, there is provided a storage chamber for storing an adsorbent capable of adsorbing and desorbing evaporated fuel,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the storage chamber, a lower partition plate is provided on the air release port side of the adsorbent so as to partition the lower side of the storage chamber in a vehicle-mounted state, and on the anti-atmosphere release port side of the adsorbent. An upper partition plate that partitions the upper side of the accommodation chamber in the mounted state is provided.

The invention according to claim 5 of the present application is the invention according to claim 4,
A plurality of the adsorbents are accommodated in the accommodation chamber,
In the storage chamber, the adsorbent and the space are alternately arranged in the extending direction of the passage,
The lower partition plate and the upper partition plate are provided corresponding to each of the adsorbents.

The invention according to claim 6 of the present application is the invention according to claim 5,
The adsorbents located on the atmosphere opening port side in the extending direction of the passage have a higher adsorption ability of the evaporated fuel than the adsorbents located on the anti-atmosphere opening port side. It is configured.

  According to the invention described in claim 1 of the present application, in the second chamber, the lower partition plate that partitions the lower side of the second chamber in the vehicle mounted state is provided on the air release port side of the second adsorbent. At the same time, the upper partition plate for partitioning the upper side of the second chamber in the vehicle mounted state is provided on the anti-atmosphere release port side of the second adsorbent so that the fuel component is propelled toward the atmosphere release port. The second adsorbent enters the second adsorbent from below the upper partition plate on the anti-atmosphere port side of the second adsorbent and from above the lower partition plate on the air port side of the second adsorbent, that is, against the gravity. It must be propelled to get over the lower partition and exit to the atmosphere opening port. In short, it becomes difficult for the fuel component in the second adsorbent to be propelled to the atmosphere opening port side when no gas flow occurs in the canister, for example, when the engine is stopped. Therefore, the speed at which the fuel component in the second adsorbent is propelled toward the atmosphere opening port can be made slower than in the prior art. As a result, the time from when the engine is stopped until the fuel component reaches the end of the adsorbent on the atmosphere opening port side becomes longer, and thus the release of the fuel component into the atmosphere is suppressed.

  According to the invention described in claim 2 of the present application, a plurality of the second adsorbents are accommodated in the second chamber, and in the second chamber, the second adsorbent and the space portion extend the passage. Since the lower partition plate and the upper partition plate are provided corresponding to each of the second adsorbents, the lower partition plate and the upper partition plate are propelled upward against the above-described gravity. It is necessary to get over the board several times.

  In addition, due to the presence of air between the second adsorbents, the residual fuel component in one second adsorbent is propelled to the adjacent second adsorbent when there is no gas flow in the canister. It becomes difficult. That is, the residual fuel component in the second adsorbent becomes difficult to propel to the atmosphere opening port side.

  As a result, the time from when the engine is stopped until the fuel component reaches the end of the adsorbent on the atmosphere opening port side becomes longer, and thus the release of the fuel component into the atmosphere is better suppressed.

  According to the invention described in claim 3 of the present application, the plurality of second adsorbents are such that the second adsorbent positioned on the atmosphere opening port side in the passage extending direction is positioned on the anti-atmosphere opening port side. Since the adsorbing capability of the evaporated fuel is higher than that of the two adsorbents, the propulsion of the residual fuel component to the atmosphere open port side by the capillary phenomenon in the second adsorbent is performed on the atmosphere open port side. The closer you are, the slower it gets. Therefore, it is possible to further increase the time from when the engine is stopped until the fuel component reaches the atmosphere opening port. Accordingly, the release of fuel components into the atmosphere is better suppressed.

  According to the invention described in claims 4, 5, and 6 of the present application, when there is only one storage chamber in which the adsorbent is stored, the same effect as in claims 1, 2, and 3 is obtained in the storage chamber. can get.

It is a perspective view which shows the external appearance of the canister of Embodiment 1 of this invention. It is a bottom view of the vehicle by which the canister of Embodiment 1 of this invention was mounted. 1 is a rear view of a vehicle on which a canister according to Embodiment 1 of the present invention is mounted. It is a schematic block diagram of the evaporative fuel processing system which has the canister of Embodiment 1 of this invention. It is sectional drawing of the canister of Embodiment 1 of this invention. It is sectional drawing by the AA line of FIG. It is a front view (arrow view by arrow B of FIG. 5) of the lower partition flow board of the canister of Embodiment 1 of this invention. It is a front view (an arrow line view by the arrow B of FIG. 5) of the upper partition flow board of the canister of Embodiment 1 of this invention.

  Embodiments of the present invention will be described below.

(Embodiment 1)
A canister 1 according to Embodiment 1 of the present invention will be described. FIG. 1 is a perspective view showing an appearance of a canister according to Embodiment 1 of the present invention. As shown in FIG. 1, the canister 1 has a case 10. The case 10 has a bottomed cylindrical shape, and an evaporative fuel introduction port 11, a purge port 12, and an air release port 13 are formed on the bottom wall on one end side in the cylinder axis direction. Inside the canister 1, as will be described in detail later, a passage through which a fluid can flow is formed, and an evaporative fuel introduction port 11 and a purge port 12 are provided on one end side of the passage. At the end side, an air release port 13 communicating with the atmosphere is provided. In addition, a first adsorbent capable of adsorbing / desorbing evaporated fuel and a second adsorbent capable of adsorbing / desorbing evaporated fuel in that order from the one end side on the passage. And a second chamber in which is accommodated. In other words, the first chamber and the second chamber constitute a part of the entire passage of the canister 1. And the extension direction of the channel | path in a 1st chamber and a 2nd chamber substantially corresponds with a cylinder axis direction.

  The canister 1 according to this embodiment is mounted on a vehicle such as an automobile. FIG. 2 is a bottom view of the vehicle on which the canister 1 according to the first embodiment of the present invention is mounted. FIG. 3 is a rear view of the vehicle on which the canister 1 according to the first embodiment of the present invention is mounted. As shown in FIG. 2, a pair of left and right side frames 41 </ b> L and 41 </ b> R extend from the front to the rear of the vehicle on the left and right side portions of the vehicle. An engine 30 is mounted between the left and right side frames 41L and 41R at the front of the vehicle. An exhaust pipe 39 extends from the engine 30 to the rear of the vehicle and is connected to the silencer 40. The fuel tank 31 is disposed on the lower surface side of the floor panel on the rear side of the vehicle. The canister 1 is disposed behind the fuel tank 31, in the vicinity of the front portion of the silencer 40, and on the inner side in the vehicle width direction of the left side frame 41L. The purpose of arranging the canister 1 in the vicinity of the front portion of the silencer 40 is to warm the canister 1 with the silencer 40 and to make it easy for the canister 1 to introduce the warmed air. The canister 1 is placed horizontally so that the cylinder axis direction is substantially horizontal. As shown in FIGS. 2 and 3, the canister 1 is disposed at the same height position as the fuel tank 31 using the space below the floor panel. A purge passage 35 that connects the engine 30 (the intake passage 34 thereof) and the purge port 12 of the canister 1 extends in the vehicle front-rear direction along the left side frame 41L. An evaporative fuel introduction passage 32 connecting the fuel tank 31 and the evaporative fuel introduction port 11 of the canister 1 extends in the front-rear direction therebetween. The atmosphere release pipe 38 connected to the atmosphere release port 13 of the canister 1 extends to a space in the rear fender behind the left rear wheel 42L of the left and right rear wheels 42L, 42R.

  FIG. 3 is a rear view of the vehicle on which the canister 1 according to the first embodiment of the present invention is mounted. The canister 1 is disposed at substantially the same height as the fuel tank 31 and effectively uses the space under the floor panel.

  FIG. 4 is a schematic configuration diagram of an evaporative fuel processing system having the canister 1 according to the first embodiment of the present invention. The evaporative fuel processing system is a system that processes evaporative fuel generated in the fuel tank 31. The evaporated fuel gas including the evaporated fuel generated in the fuel tank 31 is introduced into the canister 1 through the evaporated fuel introduction passage 32 and the evaporated fuel introduction port 11, and the introduced evaporated fuel is adsorbent in the canister 1. It is adsorbed by. The purge port 12 is connected to the intake passage 34 of the engine 30 via the purge passage 35. When the intake passage 34 becomes negative pressure by the opening / closing operation of the throttle valve 37 during the operation of the engine 30, the air release port 13 is opened. When the air is introduced into the canister 1 through the fuel, the fuel component adsorbed by the adsorbent is desorbed, and the desorbed fuel component is introduced into the combustion chamber of the engine 30 through the intake passage 34 and burned. It is used as fuel. By controlling the opening degree of the purge valve 36, the amount of evaporated fuel introduced into the intake passage 34 by purging can be controlled. Further, by controlling the opening degree of the evaporated fuel introduction valve 33, the amount of evaporated fuel introduced into the canister 1 can be controlled. The opening degree of each valve is controlled by an engine controller (ECU (not shown)) (not shown) based on the operating state of the engine 30 and the like.

  FIG. 5 is a cross-sectional view of the canister 1 according to the first embodiment of the present invention. As shown in FIG. 5, the canister 1 has a case 10. Case 10 includes a case main body 10A having a bottomed cylindrical shape and a lid 10B that closes an opening end surface of case main body 10A. Case 10 is formed, for example with resin.

  On the outside of the canister of the bottom plate 10x of the case main body 10A, an evaporative fuel introduction port 11, an air release port 13, and a purge port 12 are formed.

  A first partition wall 14 and a second partition wall 15 are formed on the inside of the canister of the bottom plate 10x of the case body 10A. The first partition wall 14 and the second partition wall 15 project in the cylinder axis direction within the space of the case body 10A. The first partition wall 14 has a distal end extending to the vicinity of the lid 10 </ b> B, a first chamber 21 communicating with the purge port 12 and the evaporated fuel introduction port 11 in the case body 10 </ b> A, and a second chamber communicating with the atmosphere release port 13. Partition into chamber 22. The second partition wall 15 is formed with a protrusion amount smaller than the protrusion amount of the first partition wall 14. The first partition wall 14 partitions the space on the one end side in the cylinder axis direction of the first chamber 21 into two spaces of the evaporated fuel introduction port 11 side and the purge port 12 side.

  In the first chamber 21, a ventilation plate 54, a filter plate 53, a first adsorbent 51, a filter plate 53, and a ventilation plate 54 are accommodated in this order from the bottom plate 10x side of the case body 10A. The cylindrical wall of the case body 10A and the first partition wall 14 are formed with stoppers 16 protruding inward of the first chamber 21 in the vicinity of the bottom plate 10x of the case body 10A. A spring 55 is interposed between the lid 10B and the spring 55 presses the vent plate 54, the filter plate 53, the first adsorbent 51, the filter plate 53, and the vent plate 54 toward the stopper 16 side. Therefore, adjacent members of the ventilation plate 54, the filter plate 53, and the first adsorbent 51 are pressed against each other so that no gap is generated between the members or between the first adsorbent 51 and the case 10. It has become. According to the configuration as described above, this structure can be easily realized by putting the above-described members into the first chamber 21 in the order described above from the opening side of the case main body 10A.

  The first adsorbent 51 adsorbs / desorbs the evaporated fuel generated in the fuel tank 31. As the first adsorbent 51, for example, activated carbon capable of adsorbing and desorbing evaporated fuel can be used. As the activated carbon for the first adsorbent 51, for example, an activated carbon having a pellet shape (for example, a diameter of 2 mm and an axial length of 4 mm) and having a peak in the vicinity of 5 nm in the volume distribution of the pore size is used.

  The filter plate 53 is made of, for example, a nonwoven fabric. The filter plate 53 suppresses the activated carbon finely pulverized by vibration or the like from entering each passage through each port.

  The ventilation plate 54 is, for example, a lattice-shaped plate material having a large number of through holes 54a. The ventilation plate 54 is made of, for example, resin.

  Spaces are provided between the ventilation plate 54 and the lid 10B of the first chamber 21 and between the ventilation plate 64 and the lid 10B of the second chamber 22, respectively, and on the lid 10B side of the partition plate 14 A gap is provided between the end portion and the lid 10 </ b> B, and a communication portion T that connects the first chamber 21 and the second chamber 22 is configured by the space and the gap.

  In the second chamber 22, a lower partition plate 68, a filter plate 63, a second adsorbent 61, a filter plate 63, an upper partition plate 69, a space formation are sequentially formed from the bottom plate 10 x side (atmosphere release port 13 side) of the case body 10 </ b> A. Member 66, lower partition plate 68, filter plate 63, second adsorbent 61, filter plate 63, upper partition plate 69, space forming member 66, lower partition plate 68, filter plate 63, second adsorbent 61, filter plate 63 The upper partition plate 69 is accommodated. A stopper 16 projecting inward of the second chamber 22 is formed in the vicinity of the bottom plate 10x of the case main body 10A on the cylindrical wall and the first partition wall 14 of the case main body 10A. A spring 65 is interposed between the lid 10 </ b> B and the spring 65 presses the upper partition plate 69 against the stopper 16. Therefore, the lower partition plate 68, the filter plate 63, the second adsorbent 61, the filter plate 63, the upper partition plate 69, the space forming member 66, the lower partition plate 68, the filter plate 63, the second adsorbent 61, and the filter plate. 63, the upper partition plate 69, the space forming member 66, the lower partition plate 68, the filter plate 63, the second adsorbent 61, the filter plate 63, and the upper partition plate 69, the adjacent members are pressed against each other, 2 No gap is formed between the adsorbent 61 and the case 10. According to the above configuration, this structure can be easily realized by putting the above-mentioned members into the second chamber 22 from the opening side of the case main body 10A in the above order.

  The second adsorbent 61 adsorbs / desorbs the evaporated fuel generated in the fuel tank 31. As the second adsorbent 61, for example, activated carbon capable of adsorbing and desorbing evaporated fuel can be used. More specifically, the second adsorbent 61 uses activated carbon that has a lower adsorption capacity than the first adsorbent 51 but has a high desorption performance. This is because the second adsorbent 61 is required to adsorb fuel while the adsorbed fuel component is easily desorbed during purging. On the other hand, the first adsorbent 51 is required to adsorb as much fuel as possible, hold the adsorbed fuel, and move as little as possible to the second chamber 22 side.

  As the activated carbon for the second adsorbent 61, for example, one having a pellet or monolith shape having a particle size larger than that of the first adsorbent 51 and having a peak in the vicinity of 1000 nm in the pore size volume distribution. Use.

  The filter plate 63 is made of, for example, a nonwoven fabric. The filter plate 63 suppresses the activated carbon finely pulverized by vibration or the like from entering each passage through each port.

  6 is a cross-sectional view taken along line AA in FIG. FIG. 7A is a front view of the lower partition plate 68 of the canister 1 according to the first embodiment of the present invention (a view taken in the direction of arrow B in FIG. 5). FIG. 7B is a front view of the upper partition plate 69 of the canister 1 according to the first embodiment of the present invention (a view taken in the direction of arrow B in FIG. 5). The lower partition plate 68 is formed of, for example, resin, and has a plurality of through holes 68a on the upper side, and allows fluid to flow through these through holes 68a. The upper partition plate 69 is made of, for example, resin, and has a plurality of through holes 69a on the lower side, and allows fluid to flow through these through holes 69a.

  Between the lower partition plate 68 and the second adsorbent 61 and between the upper partition plate 69 and the second adsorbent 61, the filter plate 63 made of the above-mentioned nonwoven fabric is provided, respectively. Functions as an air layer (space) through which fluid can flow.

  Here, among the filter plates 63, the filter plate 63 in contact with the lower partition plate 68 is made of non-woven fabric only on the upper side portion facing the through hole 68a of the lower partition plate 68, and other portions such as the lower side are ventilated. A portion made of a non-woven resin or the like and made of a non-woven fabric functions as an air layer (space) through which fluid can flow. Further, the filter plate 63 in contact with the upper partition plate 69 is made of non-woven fabric only at the lower portion facing the through hole 69a of the upper partition plate 69, and other portions such as the upper portion are not permeable to air. The part which consists of a member of this and consists of a nonwoven fabric functions as an air layer (space) through which a fluid can distribute | circulate. The filter plate 63 may be formed only in the upper part of the lower partition plate 68 facing the through hole 68a and only in the lower part of the upper partition plate 69 facing the through hole 69a.

2. Operation The operation of the canister 1 of this embodiment will be described. For example, evaporative fuel gas containing evaporative fuel generated by evaporating fuel in the fuel tank 31 at the time of refueling or parking is transmitted via the evaporative fuel introduction port 11 as the internal pressure of the fuel tank 31 increases. Introduced into the canister 1. Then, the fuel component is adsorbed by the activated carbon in the first chamber 21 and the second chamber 22 and the gas from which the fuel component is almost removed is released from the atmosphere opening port 13 to the atmosphere.

  Here, when the evaporated fuel gas continues to be adsorbed by the first adsorbent 51 and the fuel component concentration in the first adsorbent 51 becomes higher than a certain level, the evaporated fuel gas advances into the communication portion T, and further, the communication portion When the fuel component concentration in T becomes higher than a certain level, it is adsorbed by the second adsorbent 61 in the second chamber 22 from its anti-atmospheric release port 13 side. And if the fuel component concentration at the end of the second adsorbent 61 on the atmosphere release port 13 side becomes higher than a certain value, there is a possibility that it will be released to the atmosphere via the atmosphere release port 13. When the engine 30 is operated and purged, the fuel component is gradually desorbed from the atmosphere opening port 13 side of the second adsorbent 61.

  Specifically, for example, when the engine 30 is operated, if the purge valve 36 is opened due to an ECU (not shown) or a pressure difference, the air in the atmosphere is brought into the canister via the atmosphere release port 13 due to the intake negative pressure of the engine 30. 1 is introduced into the second chamber 22 and the first chamber 21. At this time, the evaporated fuel is desorbed (purged) from the first adsorbent 51 in the first chamber 21 and the second adsorbent 61 in the second chamber 22, and enters the intake passage 34 of the engine 30 via the purge port 12 together with the air. Supplied.

  In this case, in the present embodiment, a lower partition plate 68 that partitions the lower side of the second chamber 22 in a vehicle-mounted state is provided on the air release port 13 side of the second adsorbent 61, and the second adsorption. An upper partition plate 69 that partitions the upper side of the second chamber 22 in a vehicle-mounted state is provided on the anti-atmospheric release port 13 side of the agent 61. Thus, in order to propel the fuel component toward the atmosphere release port 13, the fuel component enters the second adsorbent 61 from below the upper partition plate 69 on the side opposite to the atmosphere release port 13 of the second adsorbent 61. The adsorbent 61 must be propelled from above the lower partition plate 68 on the atmosphere release port 13 side, that is, against the gravity, to get over the lower partition plate 68 and exit to the atmosphere release port 13 side. In short, it becomes difficult for the fuel component in the second adsorbent 61 to be propelled toward the atmosphere opening port 13 when no gas flow occurs in the canister 1, for example, when the engine is stopped. Therefore, the speed at which the fuel component in the second adsorbent 61 is propelled toward the atmosphere opening port 13 can be reduced as compared with the prior art. Thereby, it takes a long time for the fuel component to reach the end of the second adsorbent 61 on the atmosphere opening port 13 side after the engine 30 is stopped, and thus the release of the fuel component to the atmosphere is suppressed.

  In the present embodiment, a plurality of second adsorbents 61 are accommodated in the second chamber 22, and in the second chamber 22, the second adsorbent 61 and the space S are in the extending direction of the passage. Since the lower partition plates 68 and the upper partition plates 69 are provided corresponding to the second adsorbents 61, the lower partition plates 68 are propelled upward against the above-described gravity to cause the lower partition plates 68 to move. It is necessary to get over several times. In addition, since air exists between the second adsorbents 61, in the state where there is no gas flow in the canister 1, the residual fuel component in one second adsorbent 61 is adjacent to the second adsorbent. 61 becomes difficult to propel. That is, it becomes difficult for the residual fuel component in the second adsorbent 61 to be propelled to the atmosphere opening port 13 side. As a result, the time from when the engine 30 is stopped until the fuel component reaches the end of the second adsorbent 61 on the atmosphere release port 13 side becomes longer, and therefore, the release of the fuel component to the atmosphere is better suppressed. Is done.

  In the present embodiment, only the second chamber 22 has the plurality of lower partition plates 68 and the upper partition plate 69 and the plurality of second adsorbents 61. When such a labyrinth-like structure is adopted, the ventilation resistance is slightly increased as compared with the case where it is not adopted. Therefore, in the present embodiment, the above labyrinth structure is employed only in the second chamber 22 in consideration of suppression of the release of the fuel component from the atmosphere opening port 13 and an increase in the allowable ventilation resistance.

(Embodiment 2)
A canister 1 according to a second embodiment of the present invention will be described. The drawing is common to the first embodiment. In the second embodiment, the plurality of second adsorbents 61 are the second adsorbent 61 in which the second adsorbent 61 located on the atmosphere release port 13 side in the passage extending direction is located on the side opposite to the atmosphere release port 13. Rather, it is configured so that the evaporative fuel adsorption capacity is higher. Here, if the adsorption capacities of all the second adsorbents 61 are uniformly increased, the amount of fuel component remaining in the second adsorbent 61 on the side of the anti-atmosphere port 13 at the end of purging increases, and the fuel stops after the engine stops. The time until the component reaches the end on the atmosphere opening port 13 side is shortened. For this reason, the second adsorbent 61 on the anti-atmosphere release port 13 side is set to have a lower adsorption capacity than the second adsorbent 61 on the atmosphere release port 13 side.

  The adsorption capability of the evaporated fuel is generally expressed by butane working capacity (BWC). In the present embodiment, the second adsorbent 61 is located on the side of the atmosphere opening port 13 in the direction in which the passage extends, which is the anti-atmosphere opening port. It is comprised so that the value of a butane working capacity (BWC) may become larger than 13 side.

  The adsorbent having a large BWC value is obtained by increasing the pore density per unit volume of activated carbon used for the adsorbent. For example, when the second adsorbent 61 is formed, it is conceivable that the anti-atmosphere release port 13 side is formed by laying pellets having a larger particle diameter than the atmosphere release port 13 side.

  Further, not only the adsorption capability of the second adsorbent 61 on the atmosphere release port 13 side should be high, but it must be able to be surely removed when purging, so the setting of the adsorption capability is It is preferable to carry out in consideration of the balance with the desorption performance at the time of purging.

  With this configuration, the propulsion of the residual fuel component to the atmosphere opening port 13 side due to the capillary phenomenon in the second adsorbent 61 becomes slower as it approaches the atmosphere opening port 13 side. Therefore, the time from when the engine 30 is stopped until the fuel component reaches the atmosphere opening port 13 can be further increased. Accordingly, the release of fuel components into the atmosphere is better suppressed.

(Embodiment 3)
In the first and second embodiments, three combinations of the lower partition plate 68, the second adsorbent 61, and the upper partition plate 69 are provided. However, these combinations may be only one set. Even in this case, in order for the fuel component to be propelled toward the atmosphere release port 13 in the second chamber 22, the lower adsorbent 61 has to be seen from below the upper partition plate 69 on the side opposite to the atmosphere release port 13. The air enters the second adsorbent 61 and is propelled from above the lower partition plate 68 on the air release port 13 side of the second adsorbent 61, that is, against the gravity, over the lower partition plate 68 and over the lower partition plate 68. Must go to the 13th side. In short, it becomes difficult for the fuel component in the second adsorbent 61 to be propelled to the atmosphere opening port 13 side. Therefore, it is possible to delay the fuel component in the second adsorbent 61 from starting to be propelled toward the atmosphere opening port 13 as compared with the conventional case. Thereby, it takes a long time for the fuel component to reach the end of the second adsorbent 61 on the atmosphere opening port 13 side after the engine 30 is stopped, and thus the release of the fuel component to the atmosphere is suppressed.

  In the third embodiment as well, as in the second embodiment, the second adsorbent 61 has a higher adsorption capability of the evaporated fuel on the atmosphere opening port 13 side in the passage extending direction than on the anti-atmosphere opening port 13 side. You may comprise so that it may become. Thereby, the same effect as in the second embodiment can be obtained.

3. Summary The canister 1 of the embodiment has the following configuration and characteristics.

The canister 1 of Embodiments 1-3 is
A canister 1 mounted on a vehicle for adsorbing and desorbing evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port 11 for introducing evaporative fuel from the fuel tank 31 and a purge port 12 for communicating the intake passage 34 of the engine 30 are provided on one end side of the passage,
At the other end side of the passage, an atmosphere opening port 13 communicating with the atmosphere is provided,
On the passage, in order from the one end side, a first chamber 21 in which a first adsorbent 51 capable of adsorbing and desorbing evaporated fuel is housed, and a second adsorbent capable of adsorbing and desorbing evaporated fuel And a second chamber 22 in which 61 is accommodated,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the second chamber 22, a lower partition plate 68 is provided on the air release port 13 side of the second adsorbent 61 so as to partition the lower side of the second chamber 22 when the vehicle is mounted. An upper partition plate 69 that partitions the upper side of the second chamber 22 in a vehicle-mounted state is provided on the anti-atmosphere release port 13 side.

In Embodiments 1 and 2,
A plurality of second adsorbents 61 are accommodated in the second chamber 22,
In the second chamber 22, the second adsorbent 61 and the space S are alternately arranged in the extending direction of the passage,
The lower partition plate 68 and the upper partition plate 69 are provided corresponding to each of the second adsorbents 61.

In Embodiment 2,
The plurality of second adsorbents 61 evaporate in the second adsorbent 61 located on the atmosphere release port 13 side in the extending direction of the passage than in the second adsorbent 61 located on the anti-atmosphere release port 13 side. The fuel adsorbing ability is increased.

(Other embodiments)
In the first to third embodiments, three combinations of the lower partition plate 68, the second adsorbent 61, and the upper partition plate 69 are provided. However, the number of combinations of these combinations may be two, or four or more. Alternatively, only one set may be used.

  In the first to third embodiments, the case 10 includes the case main body 10A and the lid 10B. However, the case may be divided into an upper case and a lower case. In this case, for example, an upper partition wall may be provided in the upper case and an upper partition wall may be provided in the lower case.

  In each embodiment, the first chamber 21 and the second chamber 22 are divided. However, the present invention is also applicable to a case where the first chamber 21 and the second chamber 22 are not divided.

That is, the canister of another embodiment is
A canister 1 mounted on a vehicle for adsorbing and desorbing evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port 11 for introducing evaporative fuel from the fuel tank and a purge port 12 for communicating the intake passage 34 of the engine 30 are provided on one end side of the passage.
At the other end side of the passage, an atmosphere opening port 13 communicating with the atmosphere is provided,
On the passage, there is provided a storage chamber for storing an adsorbent capable of adsorbing and desorbing evaporated fuel,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the accommodation chamber, a lower partition plate 68 that partitions the lower side of the accommodation chamber in a vehicle-mounted state is provided on the atmosphere release port 13 side of the adsorbent, and the anti-atmosphere release port 13 side of the adsorbent. In addition, an upper partition plate 69 that partitions the upper side of the accommodation chamber in the vehicle mounted state is provided.

In other embodiments,
A plurality of the adsorbents are accommodated in the accommodation chamber,
In the storage chamber, the adsorbent and the space are alternately arranged in the extending direction of the passage,
The lower partition plate 68 and the upper partition plate 69 are provided corresponding to each of the adsorbents.

In other embodiments,
In the plurality of adsorbents, the adsorbent located on the atmosphere opening port 13 side in the extending direction of the passage has a higher adsorption capacity for the evaporated fuel than the adsorbent located on the anti-atmosphere opening port 13 side. It is configured as follows.

  The canister of the present invention is mounted on a vehicle such as an automobile and may be widely used in a canister that adsorbs and desorbs evaporated fuel.

DESCRIPTION OF SYMBOLS 1 Canister 10 Case 10A Case main body 10B Cover 11 Evaporated fuel introduction port 12 Purge port 13 Atmospheric release port 14 Partition wall 15 Partition wall 16 Stopper 21 First chamber 22 Second chamber 30 Engine 31 Fuel tank 32 Evaporated fuel introduction passage 33 Evaporated fuel Inlet valve 34 Intake passage 35 Purge passage 36 Purge valve 37 Throttle valve 38 Atmospheric release pipe 39 Exhaust pipe 40 Silencer 41L Left side frame 41R Right side frame 42L Left rear wheel 42R Right rear wheel 51 First adsorbent 53 Filter plate 54 Ventilation plate 54a Through hole 55 Spring 61 Second adsorbent 63 Filter plate 64 Ventilation plate 64a Through hole 65 Spring 66 Space forming member 68 Lower partition plate 68a Through hole 69 Upper partition plate 69a Through hole S Space portion T Communication portion

Claims (6)

A canister mounted on a vehicle that adsorbs and desorbs evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port for introducing evaporative fuel from the fuel tank and a purge port for communicating with the intake passage of the engine are provided on one end side of the passage,
At the other end of the passage, an air release port communicating with the atmosphere is provided,
A first chamber in which a first adsorbent capable of adsorbing and desorbing evaporated fuel and a second adsorbent capable of adsorbing and desorbing evaporated fuel are accommodated in order from the one end side on the passage. A second chamber is provided,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the second chamber, a lower partition plate for partitioning the lower side of the second chamber in a vehicle-mounted state is provided on the atmosphere release port side of the second adsorbent, and the anti-atmosphere of the second adsorbent. On the open port side, an upper partition plate that partitions the upper side of the second chamber in a vehicle mounted state is provided.
Canister. A plurality of the second adsorbents are accommodated in the second chamber,
In the second chamber, the second adsorbent and the space are alternately arranged in the extending direction of the passage,
The lower partition plate and the upper partition plate are provided corresponding to each of the second adsorbents,
The canister according to claim 1. The plurality of second adsorbents adsorb vaporized fuel on the second adsorbent located on the atmosphere open port side in the extending direction of the passage than on the second adsorbent located on the anti-atmosphere open port side. Configured to be more capable,
The canister according to claim 2. A canister mounted on a vehicle that adsorbs and desorbs evaporated fuel,
A passage through which fluid can flow is formed,
An evaporative fuel introduction port for introducing evaporative fuel from the fuel tank and a purge port for communicating with the intake passage of the engine are provided on one end side of the passage,
At the other end of the passage, an air release port communicating with the atmosphere is provided,
On the passage, there is provided a storage chamber for storing an adsorbent capable of adsorbing and desorbing evaporated fuel,
In the vehicle mounted state, the passage is configured to be substantially horizontal,
In the storage chamber, a lower partition plate is provided on the air release port side of the adsorbent so as to partition the lower side of the storage chamber in a vehicle-mounted state, and on the anti-atmosphere release port side of the adsorbent. An upper partition plate that partitions the upper side of the storage chamber in the mounted state is provided,
Canister. A plurality of the adsorbents are accommodated in the accommodation chamber,
In the storage chamber, the adsorbent and the space are alternately arranged in the extending direction of the passage,
The lower partition plate and the upper partition plate are provided corresponding to each of the adsorbents,
The canister according to claim 4. The adsorbents located on the atmosphere opening port side in the extending direction of the passage have a higher adsorption ability of the evaporated fuel than the adsorbents located on the anti-atmosphere opening port side. It is configured,
The canister according to claim 5.

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