Filtering tank

Abstract

The present disclosure provides a canister for adsorbing evaporated fuel generated in a fuel tank of a vehicle, the canister being provided with a plurality of bulk adsorbents and an atmosphere port. The plurality of blocky adsorbents are arranged side by side along the flow direction of the evaporated fuel in a flow path through which the evaporated fuel passes, and the plurality of blocky adsorbents adsorb the evaporated fuel. The atmosphere port is provided at an end of the flow path and is open to the atmosphere. The plurality of blocky adsorbents include at least a first blocky adsorbent and a second blocky adsorbent adjacent to each other. The first adsorbent lumps have at least one protrusion, and the at least one protrusion protrudes from a surface of the first adsorbent lumps facing the second adsorbent lumps. The at least one convex portion forms a gap located between the first bulk adsorbent and the second bulk adsorbent around the at least one convex portion.

Description

Technical Field

[0001] The present disclosure relates to filter canisters. Background Art

[0002] A canister is installed in a vehicle such as a car, and is used to suppress the emission of evaporated fuel generated in the fuel tank into the atmosphere. The inside of the canister is filled with an adsorbent such as activated carbon. The evaporated fuel generated from the fuel tank is introduced into the inside of the canister and is temporarily adsorbed by the adsorbent. When the internal combustion engine is started, the evaporated fuel is desorbed from the adsorbent and supplied to the internal combustion engine.

[0003] Japanese Patent No. 7244553 discloses an evaporated fuel processing device. The evaporated fuel processing device has a plurality of adsorption chambers. The plurality of adsorption chambers are arranged along the flow path of evaporated fuel inside the canister. Each adsorption chamber has an adsorption layer filled with an adsorbent therein. Summary of the invention

[0004] In the evaporated fuel processing device disclosed in Japanese Patent Gazette No. 7244553, a block adsorbent is filled in the adsorption layer. For example, the block adsorbent is formed using fibrous activated carbon or the like. The block adsorbent is, for example, cylindrical or polygonal. In the evaporated fuel processing device, the evaporated fuel adsorbed in the block adsorbent moves inside the block adsorbent under the action of intermolecular forces in an attempt to reach an equilibrium state. Therefore, the evaporated fuel adsorbed in the block adsorbent crosses the block adsorbent from the fuel tank side located on the evaporated fuel flow path and moves to the atmosphere side located on the flow path, so that the evaporated fuel is easily discharged into the atmosphere.

[0005] In one aspect of the present disclosure, it is desirable to reduce the amount of evaporated fuel emitted into the atmosphere.

[0006] One scheme of the present disclosure is a filter canister, which is used to adsorb evaporated fuel generated in a fuel tank of a vehicle, and the filter canister is provided with a plurality of block adsorbents and an atmospheric port. The plurality of block adsorbents are arranged along the flow direction of the evaporated fuel in a flow path through which the evaporated fuel passes, and the plurality of block adsorbents are used to adsorb the evaporated fuel. The atmospheric port is provided at the end of the flow path and is open to the atmosphere. The plurality of block adsorbents include at least a first block adsorbent and a second block adsorbent adjacent to each other. The first block adsorbent has at least one protrusion, and the at least one protrusion protrudes from a surface of the first block adsorbent opposite to the second block adsorbent. The at least one protrusion forms a gap between the first block adsorbent and the second block adsorbent around the at least one protrusion.

[0007] According to the above configuration, a gap is formed between the first adsorbent and the second adsorbent. Therefore, it is possible to suppress the evaporated fuel from moving between the first adsorbent and the second adsorbent. Therefore, it is possible to reduce the amount of evaporated fuel discharged into the atmosphere.

[0008] In one embodiment of the present disclosure, the filter canister may have a plurality of adsorption chambers in the flow path, and the plurality of adsorption chambers are used to adsorb evaporated fuel. The plurality of adsorption chambers may be arranged along the flow direction. The first block adsorbent and the second block adsorbent may be arranged in the adsorption chambers closest to the atmosphere port in the flow direction among the plurality of adsorption chambers.

[0009] According to the above configuration, evaporated fuel is adsorbed in adsorption chambers other than the adsorption chambers in which the first block adsorbent and the second block adsorbent are arranged, thereby reducing the evaporated fuel adsorbed by the first block adsorbent and the second block adsorbent. Therefore, the amount of evaporated fuel discharged into the atmosphere can be reduced.

[0010] In one aspect of the present disclosure, at least one protrusion may abut against the second block-shaped adsorbent.

[0011] According to the above configuration, it is possible to suppress the first block-shaped adsorbent and the second block-shaped adsorbent from moving due to vibration, etc. Therefore, it is possible to improve the stability of the first block-shaped adsorbent and the second block-shaped adsorbent.

[0012] In one embodiment of the present disclosure, at least one convex portion may have a shape in which the area of ​​the first cross section is smaller than the area of ​​the second cross section. The first cross section and the second cross section are cross sections perpendicular to the protruding direction of the at least one convex portion. The first cross section is located closer to the second block-shaped adsorbent than the second cross section.

[0013] According to the above configuration, the contact area between the first block-shaped adsorbent and the second block-shaped adsorbent is reduced, so that the evaporated fuel can be suppressed from moving between the first adsorbent and the second adsorbent, thereby reducing the amount of evaporated fuel discharged into the atmosphere.

[0014] In one embodiment of the present disclosure, the surface area of ​​the surface facing the atmosphere port of the block adsorbent closest to the atmosphere port in the flow direction among the plurality of block adsorbents may be smaller than the surface area of ​​the surface of the block adsorbent located on the opposite side of the surface facing the atmosphere port.

[0015] According to the above configuration, the surface area of ​​the surface of the block-shaped adsorbent adjacent to the atmosphere port facing the atmosphere port can be reduced, thereby reducing the amount of evaporated fuel discharged into the atmosphere. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic cross-sectional view of the filter tank.

[0017] Figure 2 This is a perspective view of the block-shaped adsorbent in the canister according to the first embodiment.

[0018] Figure 3 This is a cross-sectional view of a plurality of block-shaped adsorbents arranged in a flow path of evaporated fuel in the canister according to the first embodiment.

[0019] Figure 4 This is a perspective view of a block adsorbent in a canister according to another embodiment.

[0020] Figure 5 This is a perspective view of a block adsorbent in a canister according to another embodiment.

[0021] Fig. 6A is a cross-sectional view of a plurality of block-shaped adsorbents arranged in a filter tank according to another embodiment so that convex portions face each other; Figure 6B This is a cross-sectional view of a plurality of block-shaped adsorbents having convex portions of different shapes in a canister according to another embodiment.

[0022] Fig. 7A is a cross-sectional view of a plurality of block adsorbents in a canister according to another embodiment, and is a cross-sectional view of a block adsorbent sandwiched between two block adsorbents having convex portions formed on both sides in the flow direction of evaporated fuel; Figure 7B It is a cross-sectional view of a plurality of adsorbents including a block-shaped adsorbent having no convex portion in a canister according to another embodiment. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0024] The embodiments of the present disclosure are not limited to the following embodiments, and can be implemented in various forms within the technical scope to which the present disclosure belongs.

[0025] [1. First embodiment]

[0026] [1-1. Structure]

[0027] [1-1-1. Overall structure]

[0028] Figure 1 The canister 1 shown is mounted on a vehicle such as an automobile. The canister 1 adsorbs evaporated fuel generated in a fuel tank of the vehicle, thereby preventing the evaporated fuel from flowing out of the vehicle. The canister 1 desorbs the adsorbed evaporated fuel by introducing air from the outside of the vehicle. The canister 1 allows the desorbed evaporated fuel to flow out to the internal combustion engine of the vehicle.

[0029] The filter tank 1 has a filling port 2, a purge port 3, an atmospheric port 4, and an adsorption portion 5 including a plurality of adsorption chambers. The filter tank 1 has a flow path inside thereof, and the flow path is used for the flow of fluids such as evaporated fuel and atmosphere. A portion of the flow path functions as an adsorption chamber. As an example in this embodiment, the flow path is folded back at the connecting channel 6. The flow path is generally U-shaped. Hereinafter, the direction in which the fluid flows inside the filter tank 1 is referred to as the flow direction A.

[0030] The charging port 2 and the purge port 3 are both provided at the first end of the filter tank 1 in the flow direction A. The atmosphere port 4 is provided at the second end of the filter tank 1 in the flow direction A, and the second end is located on the opposite side of the first end. Hereinafter, the side provided with the charging port 2 and the purge port 3 in the flow direction A is referred to as the vehicle side. The side provided with the atmosphere port 4 in the flow direction A is referred to as the atmosphere side.

[0031] The filling port 2 is connected to the fuel tank via a pipe and is configured to introduce evaporated fuel into the canister 1 .

[0032] The purge port 3 is connected to an intake pipe of the vehicle internal combustion engine and is configured to allow evaporated fuel to flow out from the inside of the canister 1 .

[0033] The atmosphere port 4 is connected to the outside of the vehicle and is open to the atmosphere. The atmosphere port 4 is configured to introduce air into the interior of the canister 1. In addition, the atmosphere port 4 is configured to release the gas that has been processed to remove the evaporated fuel into the atmosphere.

[0034] A plurality of adsorption chambers are provided in the flow path inside the filter tank 1. An adsorbent for adsorbing evaporated fuel is arranged in each of the plurality of adsorption chambers. The filter tank 1 has a first adsorption chamber 51, a second adsorption chamber 52, and a third adsorption chamber 53 as the plurality of adsorption chambers. An example of the adsorbent includes porous materials such as activated carbon, zeolite, and silica gel. An example of activated carbon includes granular activated carbon, activated carbon agglomerates formed into a honeycomb shape, and activated carbon agglomerates formed into a sheet shape, a rectangular parallelepiped shape, a cylindrical shape, a polygonal prism shape, etc. using fibrous activated carbon.

[0035] A plurality of adsorption chambers are connected in series along the flow direction. The plurality of adsorption chambers are arranged in the order of the first adsorption chamber 51, the second adsorption chamber 52, and the third adsorption chamber 53 from the atmospheric port 4 side. The second adsorption chamber 52 and the third adsorption chamber 53 are connected to each other via the connecting channel 6. In other words, in the flow direction A, the first adsorption chamber 51 and the second adsorption chamber 52 are arranged at positions closer to the atmospheric side than the connecting channel 6. In the flow direction A, the third adsorption chamber 53 is arranged at a position closer to the vehicle side than the connecting channel 6. In the present embodiment, the lengths of the plurality of adsorption chambers in the flow direction A are ranked in the order of the third adsorption chamber 53, the second adsorption chamber 52, and the first adsorption chamber 51.

[0036] [1-1-2. Composition of block adsorbent]

[0037] A plurality of block-shaped adsorbents 70 are disposed inside the first adsorption chamber 51. The plurality of block-shaped adsorbents 70 are block-shaped adsorbents for adsorbing evaporated fuel. Figure 2 As shown, each block adsorbent 70 includes a main body 71 and at least one convex portion 72. At least one convex portion 72 protrudes from the surface of the main body 71. As an example of each block adsorbent 70, there is an activated carbon agglomerate obtained by forming fibrous activated carbon. Figure 2 In the example shown, each block-shaped adsorbent 70 has a plurality of protrusions 72 as at least one protrusion 72.

[0038] The main body 71 has a cylindrical outer shape corresponding to the inner wall shape of the first adsorption chamber 51 accommodating the block adsorbent 70. The main body 71 has a first surface 711 and a second surface 712 facing each other, and a side surface 713. The protrusion 72 is a portion protruding from the first surface 711 of the main body 71. The protrusion 72 is formed so that the area of ​​the cross section of the protrusion 72 perpendicular to the protruding direction of the protrusion 72 becomes smaller as it moves away from the first surface 711. In the present embodiment, as an example, five protrusions 72 are formed on the first surface 711 of each block adsorbent 70. The five protrusions 72 have a ridge shape parallel to each other.

[0039] The convex portion 72 is formed by using a mold with a concave portion when forming the block adsorbent 70. According to another example, the convex portion 72 may be formed by cutting a portion of the block adsorbent 70. The convex portion 72 may also be formed on the main body 71 of the block adsorbent 70 by bonding such as gluing.

[0040] [1-1-3. Configuration of block adsorbent]

[0041] The filter tank 1 includes at least a first block adsorbent 70a and a second block adsorbent 70b as a plurality of block adsorbents 70. The shapes and materials of the first block adsorbent 70a and the second block adsorbent 70b are similar to those of the filter tank 1. Figure 2 The block adsorbent 70 shown is the same. However, the shapes and materials of the first block adsorbent 70a and the second block adsorbent 70b are not limited thereto and may be different from each other. The first block adsorbent 70a has a first main body 71a as the main body 71 and a first convex portion 72a as the convex portion 72. The second block adsorbent 70b has a second main body 71b as the main body 71 and a second convex portion 72b as the convex portion 72.

[0042] like Figure 3As shown, the first block adsorbent 70a and the second block adsorbent 70b are arranged in the flow path along the flow direction A in such a manner that the first convex portion 72a and the second convex portion 72b are respectively oriented toward the vehicle side in the flow direction A. The first block adsorbent 70a and the second block adsorbent 70b are particularly arranged inside the first adsorption chamber 51. The surfaces of the first block adsorbent 70a and the second block adsorbent 70b on which the first convex portion 72a and the second convex portion 72b are respectively formed (i.e., the first surface 711) are both substantially orthogonal to the flow direction A.

[0043] The first block adsorbent 70a is arranged on the atmospheric side closer to the flow direction A than the second block adsorbent 70b. The first block adsorbent 70a is adjacent to the atmospheric port 4. The first convex portion 72a and the second convex portion 72b are not formed on the surface of the first block adsorbent 70a and the second block adsorbent 70b on the atmospheric side in the flow direction A. The surface is a roughly planar shape. In other words, the surface area of ​​the surface of the first block adsorbent 70a facing the atmospheric port 4 is smaller than the surface area of ​​the surface of the first block adsorbent 70a on the opposite side of the surface facing the atmospheric port 4 (in other words, the surface facing the second block adsorbent 70b). Similarly, the surface area of ​​the surface of the second block adsorbent 70b facing the first block adsorbent 70a is smaller than the surface area of ​​the surface of the second block adsorbent 70b on the opposite side of the surface facing the first block adsorbent 70a. The difference in the surface area between the block-shaped adsorbents 70a and 70b is caused by the presence or absence of the convex portions 72a and 72b.

[0044] The first protrusion 72a of the first block adsorbent 70a abuts against the surface of the second block adsorbent 70b that is opposite to the first block adsorbent 70a. The first protrusion 72a forms a gap 8 between the first block adsorbent 70a and the second block adsorbent 70b around the first protrusion 72a. The first protrusion 72a is formed so that the area of ​​the cross section of the first protrusion 72a perpendicular to the protruding direction of the first protrusion 72a decreases as it approaches the second block adsorbent 70b.

[0045] The first block adsorbent 70a and the second block adsorbent 70b are fixed to the inside of the first adsorption chamber 51 by being pressed in. According to other embodiments, the first block adsorbent 70a and the second block adsorbent 70b may be fixed by a fixing component provided inside the first adsorption chamber 51. In the present embodiment, the cross section of the first adsorption chamber 51 perpendicular to the flow direction A is circular. The side surfaces of the first block adsorbent 70a and the second block adsorbent 70b abut against the inner circumferential surface of the first adsorption chamber 51 so that no gap is generated between the side surfaces of the first block adsorbent 70a and the side surfaces of the second block adsorbent 70b and the surface along the flow direction A in the first adsorption chamber 51.

[0046] [1-2. Action and effect]

[0047] According to the embodiments described in detail above, the following functions and effects can be achieved.

[0048] (1a) The first block adsorbent 70a is arranged at a position closer to the atmosphere side in the flow direction A than the second block adsorbent 70b. The first protrusion 72a of the first block adsorbent 70a abuts against the surface of the second block adsorbent 70b that is opposite to the first block adsorbent 70a. The first protrusion 72a forms a gap 8 between the first block adsorbent 70a and the second block adsorbent 70b around the first protrusion 72a.

[0049] According to the above-mentioned structure, the evaporated fuel flowing into the first adsorption chamber 51 is firstly adsorbed by the second block adsorbent 70b. The evaporated fuel adsorbed in the second block adsorbent 70b moves to the first block adsorbent 70a by the intermolecular force acting between the second block adsorbent 70b and the first block adsorbent 70a. At this time, the portion of the first block adsorbent 70a that abuts against the second block adsorbent 70b is the first protrusion 72a, not the first surface of the first main body 71a of the first block adsorbent 70a. Therefore, the area of ​​the abutting portion is smaller than the area of ​​the first surface of the first main body 71a of the first block adsorbent 70a in contact with the second block adsorbent 70b when the first protrusion 72a is not formed on the first block adsorbent 70a.

[0050] Furthermore, the first protrusion 72a is formed so that the area of ​​the cross section of the first protrusion 72a perpendicular to the protruding direction of the first protrusion 72a (hereinafter referred to as the cross-sectional area of ​​the first protrusion 72a) decreases toward the second block-shaped adsorbent 70b.

[0051] According to the above configuration, the area of ​​the portion of the first block adsorbent 70a that contacts the second block adsorbent 70b is smaller than the area when the cross-sectional area of ​​the first convex portion 72a is constant. The area of ​​the contact portion is also smaller than the area when the cross-sectional area of ​​the first convex portion 72a increases toward the second block adsorbent 70b.

[0052] Therefore, the intermolecular force is not likely to act between the evaporated fuel adsorbed in the second block adsorbent 70b and the first block adsorbent 70a. Therefore, the evaporated fuel adsorbed in the second block adsorbent 70b can be suppressed from moving to the first block adsorbent 70a. Therefore, the amount of evaporated fuel discharged from the first block adsorbent 70a to the atmosphere through the atmosphere port 4 can be reduced.

[0053] (1b) The first block adsorbent 70a and the second block adsorbent 70b are arranged in the first adsorbent chamber 51, the second adsorbent chamber 52, and the third adsorbent chamber 53, and are arranged inside the first adsorbent chamber 51 which is closest to the atmospheric port 4. The evaporated fuel introduced into the canister 1 from the filling port 2 passes through the third adsorbent chamber 53, the second adsorbent chamber 52, and the first adsorbent chamber 51 in sequence. The first adsorbent chamber 51, the second adsorbent chamber 52, and the third adsorbent chamber 53 are arranged with adsorbents for adsorbing the evaporated fuel.

[0054] According to the above configuration, a part of the evaporated fuel introduced into the canister 1 from the filling port 2 is adsorbed by the adsorbents arranged in the second adsorption chamber 52 and the third adsorption chamber 53. Therefore, the concentration of the evaporated fuel flowing into the first adsorption chamber 51 is lower than the concentration of the evaporated fuel flowing into the second adsorption chamber 52 or the third adsorption chamber 53. Therefore, the amount of evaporated fuel discharged from the first block-shaped adsorbent 70a arranged in the first adsorption chamber 51 to the atmosphere via the atmosphere port 4 can be reduced.

[0055] (1c) The surface areas of the first and second block adsorbents 70a and 70b on the atmosphere side in the flow direction A are smaller than the surface areas of the first and second block adsorbents 70a and 70b on the vehicle side in the flow direction A.

[0056] According to the above configuration, the amount of evaporated fuel discharged from the first block adsorbent 70 a through the atmosphere port 4 into the atmosphere can be further reduced.

[0057] (1d) The first convex portion 72a of the first block adsorbent 70a abuts against the surface of the second block adsorbent 70b that faces the first block adsorbent 70a.

[0058] According to the above configuration, the first adsorbent block 70a and the second adsorbent block 70b can be restricted from being displaced in the flow direction A due to vibration or the like. Therefore, the stability and durability of the first convex portion 72a and the second convex portion 72b can be improved.

[0059] (1e) A plurality of first protrusions 72a are formed on the first adsorbent block 70a. The plurality of first protrusions 72a abut against the surface of the second adsorbent block 70b that faces the first adsorbent block 70a.

[0060] According to the above configuration, the impact on the first convex portion 72a due to vibration or the like is dispersed. In addition, since there are a plurality of portions of the first adsorbent block 70a that abut against the second adsorbent block 70b, the position of the first adsorbent block 70a relative to the second adsorbent block 70b is stabilized. Thus, the stability and durability of the first convex portion 72a can be improved.

[0061] (1f) The side surfaces of the first block adsorbent 70a and the second block adsorbent 70b abut against the inner circumferential surface of the first adsorption chamber 51 so that no gap is generated between the side surfaces of the first block adsorbent 70a and the side surfaces of the second block adsorbent 70b and the surfaces along the flow direction A in the first adsorption chamber 51.

[0062] According to the above configuration, the evaporated fuel flowing into the first adsorption chamber 51 passes through the first block adsorbent 70a and the second block adsorbent 70b. Therefore, the amount of evaporated fuel discharged from the first adsorption chamber 51 to the atmosphere through the atmosphere port 4 can be further reduced.

[0063] (1g) The first convex portion 72a of the first block adsorbent 70a contacts the surface of the second block adsorbent 70b that faces the first block adsorbent 70a. A gap 8 is formed around the first convex portion 72a.

[0064] According to the above configuration, the gap 8 can be formed between the first adsorbent block 70 a and the second adsorbent block 70 b without using a separator such as a filter.

[0065] (1h) The first adsorbent block 70a and the second adsorbent block 70b have the same shape. Therefore, the first adsorbent block 70a and the second adsorbent block 70b can be formed by the same manufacturing method. Therefore, the manufacturing cost of the first adsorbent block 70a and the second adsorbent block 70b can be reduced.

[0066] [2. Other embodiments]

[0067] The embodiments of the present disclosure are described above, but the present disclosure is not limited to the above embodiments and can be implemented in various forms.

[0068] (2a) In the above embodiment, five convex portions 72 of the adsorbent block 70 are formed on the first surface 711 of the adsorbent block 70. These convex portions 72 have a convex strip shape parallel to each other. However, the shape and number of the convex portions 72 are not limited thereto.

[0069] For example, the block adsorbent 70 may be replaced with Figure 4 The block adsorbent 270 is shown. The block adsorbent 270 includes a main body 271 and a protrusion 272. The shape of the main body 271 is the same as the main body 71 of the block adsorbent 70. The protrusion 272 has a conical shape and protrudes from the first surface of the main body 271. At least one protrusion 272 is formed on the first surface of the main body 271. For example, a plurality of protrusions 272 are formed.

[0070] Alternatively, the block adsorbent 70 may be replaced by Figure 5The block adsorbent 370 is shown. The block adsorbent 370 includes a main body 371 and a protrusion 372. The shape of the main body 371 is the same as that of the main body 71 of the block adsorbent 70. The protrusion 372 protrudes from the first surface of the main body 371 and extends in a ring shape around the axis of the cylindrical main body 371. At least one protrusion 372 is formed on the first surface of the main body 371. For example, a plurality of protrusions 372 are formed.

[0071] (2b) In the above embodiment, the plurality of block adsorbents 70 arranged inside the first adsorption chamber 51 are both the first block adsorbent 70a and the second block adsorbent 70b. The first block adsorbent 70a and the second block adsorbent 70b have the same shape. The first block adsorbent 70a and the second block adsorbent 70b are arranged along the flow direction A inside the first adsorption chamber 51 in such a manner that the first protrusion 72a and the second protrusion 72b are both facing the vehicle side in the flow direction A. However, the shape, number, and direction of the plurality of block adsorbents 70 arranged inside the first adsorption chamber 51 are not limited thereto. The shapes of the plurality of block adsorbents 70 may be different from each other. The number of the plurality of block adsorbents 70 may be more than three. The protrusion 72 may face either the atmosphere side or the vehicle side in the flow direction A.

[0072] For example Fig. 6A As shown, the second block adsorbent 70b may be arranged so that the second convex portion 72b faces the atmosphere side in the flow direction A. In other words, the first block adsorbent 70a and the second block adsorbent 70b may be arranged so that the first convex portion 72a of the first block adsorbent 70a and the second convex portion 72b of the second block adsorbent 70b face each other. At this time, the first convex portion 72a and the second convex portion 72b may be arranged so as to abut against each other.

[0073] Or, if Figure 6B As shown, the second block adsorbent 70b can be replaced with a third block adsorbent 70c. In the third block adsorbent 70c, instead of the second protrusion 72b in the second block adsorbent 70b, a third protrusion 72c is provided, and the third protrusion 72c is different from the first protrusion 72a of the first block adsorbent 70a in at least one of the number and shape. The third protrusion 72c is formed on the third body 71c.

[0074] Or, if Fig. 7AAs shown, the fourth block adsorbent 70d may be arranged between the first block adsorbent 70a and the second block adsorbent 70b, or the fourth block adsorbent 70d may be arranged instead of the second block adsorbent 70b. The fourth block adsorbent 70d may have a fourth protrusion, and the fourth protrusion includes at least one fourth protrusion 721 and at least one fourth protrusion 722. The fourth protrusion 721 is a portion protruding from the surface of the fourth body 71d on the atmosphere side in the flow direction A. The fourth protrusion 722 is a portion protruding from the surface of the fourth body 71d on the vehicle side in the flow direction A. The fourth protrusion 721 may abut against the first protrusion 72a. The fourth protrusion 722 may abut against the second protrusion 72b.

[0075] Or, if Figure 7B As shown, the fifth block adsorbent 70e without the protrusion 72 can be arranged at a position closer to the atmosphere side in the flow direction A than the first block adsorbent 70a. The surface of the fifth block adsorbent 70e on the atmosphere side in the flow direction A can be a flat shape. At this time, the first block adsorbent 70a and the second block adsorbent 70b can be arranged so that the first protrusion 72a and the second protrusion 72b are both facing the atmosphere side in the flow direction A. The first protrusion 72a can abut the surface of the fifth block adsorbent 70e opposite to the first block adsorbent 70a. The second protrusion 72b can abut the surface of the first block adsorbent 70a opposite to the second block adsorbent 70b.

[0076] (2c) In the above embodiment, the block adsorbent 70 is cylindrical. However, the shape of the block adsorbent 70 is not limited to a cylindrical shape. For example, the shape of the block adsorbent 70 may be any shape that fits into the inner circumference of the first adsorption chamber 51. When the cross section of the first adsorption chamber 51 perpendicular to the flow direction A is a polygon, the block adsorbent 70 may be a polygonal column shape that fits into the inner circumference of the first adsorption chamber 51.

[0077] (2d) In the above embodiment, the convex portion 72 is formed such that the area of ​​the cross section perpendicular to the protruding direction of the convex portion 72 decreases toward the outside of the block-shaped adsorbent 70. However, the cross section area is not limited thereto.

[0078] For example, the first convex portion 72a may be formed so that, in a first section and a second section perpendicular to the protruding direction of the first convex portion 72a, the area of ​​the first section located closer to the second block-shaped adsorbent 70b than the second section is smaller than the area of ​​the second section. The convex portion 72 may be formed so that the cross section parallel to the protruding direction of the convex portion 72 has a stepped shape.

[0079] Alternatively, the area of ​​the cross section of the convex portion 72 perpendicular to the protruding direction of the convex portion 72 may be constant. In other words, the shape of the convex portion 72 may be a cylindrical shape, a polygonal column shape, or the like.

[0080] (2e) Multiple functions of one component in the above-mentioned embodiment may be realized by multiple components, or one function of one component in the above-mentioned embodiment may be realized by multiple components. In addition, multiple functions of multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. In addition, part of the structure of the above-mentioned embodiment may be omitted. At least part of the structure of the above-mentioned embodiment may be added to the structure of the above-mentioned other embodiment, or at least part of the structure of the above-mentioned embodiment may be replaced with the structure of the above-mentioned other embodiment.

[0081] [Technical ideas disclosed in this specification]

[0082] [Project 1]

[0083] A canister for absorbing evaporated fuel generated in a fuel tank of a vehicle, the canister being characterized by comprising:

[0084] a plurality of block adsorbents arranged along a flow direction of the evaporated fuel in a flow path through which the evaporated fuel passes, and the plurality of block adsorbents are used to adsorb the evaporated fuel; and

[0085] an atmospheric port, the atmospheric port being disposed at an end of the flow path and open to the atmosphere, and

[0086] The plurality of block-shaped adsorbents include at least a first block-shaped adsorbent and a second block-shaped adsorbent adjacent to each other.

[0087] The first block-shaped adsorbent has at least one convex portion, and the at least one convex portion protrudes from a surface of the first block-shaped adsorbent that is opposite to the second block-shaped adsorbent.

[0088] The at least one protrusion forms a gap between the first block-shaped adsorbent and the second block-shaped adsorbent around the at least one protrusion.

[0089] [Project 2]

[0090] The filter tank according to item 1 is characterized in that:

[0091] The canister includes a plurality of adsorption chambers in the flow path, and the plurality of adsorption chambers are used to adsorb the evaporated fuel.

[0092] The plurality of adsorption chambers are arranged along the flow direction,

[0093] The first block-shaped adsorbent and the second block-shaped adsorbent are arranged in adsorption chambers closest to the atmospheric port in the flow direction among the plurality of adsorption chambers.

[0094] [Item 3]

[0095] The filter tank according to item 1 or 2 is characterized in that:

[0096] The at least one protrusion contacts the second block-shaped adsorbent.

[0097] [Item 4]

[0098] The filter tank according to item 3 is characterized in that:

[0099] The at least one convex portion has a shape in which the area of ​​the first cross section is smaller than the area of ​​the second cross section,

[0100] The first cross section and the second cross section are cross sections perpendicular to the protruding direction of the at least one convex portion,

[0101] The first cross section is located closer to the second block-shaped adsorbent than the second cross section.

[0102] [Item 5]

[0103] The filter tank according to any one of items 1 to 4, characterized in that

[0104] A surface of a block adsorbent closest to the atmospheric port in the flow direction among the plurality of block adsorbents facing the atmospheric port has a smaller surface area than a surface of the block adsorbent located opposite to the surface facing the atmospheric port.

Claims

1. A canister for absorbing evaporated fuel generated in a fuel tank of a vehicle, the canister comprising: a plurality of block adsorbents arranged along a flow direction of the evaporated fuel in a flow path through which the evaporated fuel passes, and the plurality of block adsorbents are used to adsorb the evaporated fuel; and an atmospheric port, the atmospheric port being disposed at an end of the flow path and open to the atmosphere, and The plurality of block-shaped adsorbents include at least a first block-shaped adsorbent and a second block-shaped adsorbent adjacent to each other. The first block-shaped adsorbent has at least one convex portion, and the at least one convex portion protrudes from a surface of the first block-shaped adsorbent that is opposite to the second block-shaped adsorbent. The at least one protrusion forms a gap between the first block-shaped adsorbent and the second block-shaped adsorbent around the at least one protrusion.

2. The filter tank according to claim 1, characterized in that: The canister includes a plurality of adsorption chambers in the flow path, and the plurality of adsorption chambers are used to adsorb the evaporated fuel. The plurality of adsorption chambers are arranged along the flow direction, The first block-shaped adsorbent and the second block-shaped adsorbent are arranged in adsorption chambers closest to the atmospheric port in the flow direction among the plurality of adsorption chambers.

3. The filter tank according to claim 1 or 2, characterized in that: The at least one protrusion contacts the second block-shaped adsorbent.

4. The filter tank according to claim 3, characterized in that: The at least one convex portion has a shape in which the area of ​​the first cross section is smaller than the area of ​​the second cross section, The first cross section and the second cross section are cross sections perpendicular to the protruding direction of the at least one convex portion, The first cross section is located closer to the second block-shaped adsorbent than the second cross section.

5. The filter tank according to claim 1 or 2, characterized in that: A surface of a block adsorbent closest to the atmospheric port in the flow direction among the plurality of block adsorbents facing the atmospheric port has a smaller surface area than a surface of the block adsorbent located opposite to the surface facing the atmospheric port.

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