Filtering canister

Abstract

The present disclosure provides a filter can capable of reducing manufacturing costs. One aspect of the present disclosure relates to a filter can. The filter can includes an outer case having a filling port through which evaporated fuel is introduced, a purge port through which the evaporated fuel is discharged, and an atmosphere port that is open to the atmosphere; an inner case that is disposed inside the outer case and has an internal space that is connected to the atmosphere port; a first adsorption chamber that is disposed in the internal space of the inner case; and a second adsorption chamber that is disposed in the internal space of the inner case at a position on a flow path of the evaporated fuel between the first adsorption chamber and the atmosphere port. An area of a cross section of the second adsorption chamber that is perpendicular to a flow direction of gas and an area of a cross section of the first adsorption chamber that is perpendicular to the flow direction of the gas are different.

Description

Technical Field

[0001] This disclosure relates to filter tanks. Background Technology

[0002] A filter canister is installed in the vehicle's fuel tank to prevent evaporated fuel from being emitted into the atmosphere. The filter canister adsorbs evaporated fuel onto an adsorbent and uses drawn-in air to desorb the fuel from the adsorbent for purging, and then supplies the desorbed fuel to the engine.

[0003] The filter tank typically contains multiple adsorption chambers. The ventilation resistance can be adjusted by changing the cross-sectional area of ​​these multiple adsorption chambers (see Japanese Patent Application Publication No. 2015-57551). Summary of the Invention

[0004] In a filter canister with multiple adsorption chambers having different cross-sectional areas as described above, during the molding of the filter canister shell, sometimes parts cannot be removed from the mold due to the configuration and shape of the adsorption chambers. In this case, it is necessary to divide the shell into multiple parts.

[0005] If the shell is divided into multiple parts, the number of welded sections in the shell will increase during the manufacture of the filter canister. This results in modifications to the welding equipment and increased manufacturing time, thereby increasing the manufacturing cost of the filter canister.

[0006] One aspect of this disclosure preferably provides a filter canister that can reduce manufacturing costs.

[0007] One aspect of this disclosure relates to a filter canister that adsorbs and desorbs evaporating fuel generated in a vehicle's fuel tank. The filter canister comprises: an outer shell having a filling port for introducing evaporating fuel, a purging port for discharging evaporating fuel, and an atmospheric port open to the atmosphere; an inner shell disposed inside the outer shell and having an internal space directly connected to the atmospheric port or connected to the atmospheric port via other chambers; a first adsorption chamber; a second adsorption chamber; a first adsorbent housed in the first adsorption chamber; and a second adsorbent housed in the second adsorption chamber.

[0008] The first adsorption chamber is located within the internal space of the inner shell. The second adsorption chamber is located within the internal space of the inner shell, positioned between the first adsorption chamber and the atmospheric vent in the flow path of the evaporated fuel. The cross-sectional area of ​​the second adsorption chamber perpendicular to the gas flow direction differs from that of the first adsorption chamber.

[0009] According to the structure described above, the inner shell is inserted into the interior of the outer shell, thereby obtaining a filter canister with a first adsorption chamber and a second adsorption chamber having different cross-sectional areas. Therefore, the number of welded sections in the filter canister shell can be reduced, thus reducing the manufacturing cost of the filter canister.

[0010] In one embodiment of this disclosure, the filter canister may further include a third adsorption chamber and a third adsorbent. The third adsorption chamber is disposed inside the outer shell and outside the inner shell, and both the filling port and the purging port are connected to the third adsorption chamber. The third adsorbent is housed within the third adsorption chamber. According to the structure described above, the volume of the third adsorption chamber, which serves as the main chamber, can be easily ensured.

[0011] In one embodiment of this disclosure, the area of ​​the cross-section of the second adsorption chamber perpendicular to the gas flow direction can be larger than the area of ​​the cross-section of the first adsorption chamber perpendicular to the gas flow direction. According to the structure described above, the manufacturing cost of the filter canister can be reduced, and the ventilation resistance of the filter canister can be decreased.

[0012] In one embodiment of this disclosure, the gas flow direction in the second adsorption chamber can be parallel to the gas flow direction in the first adsorption chamber. Based on the structure described above, the structure of the inner shell can be simplified. This facilitates a reduction in the manufacturing cost of the filter canister.

[0013] In one embodiment of this disclosure, the gas flow direction in the second adsorption chamber may intersect with the gas flow direction in the first adsorption chamber. Based on the structure described above, the degree of freedom in the external dimensions of the filter canister can be increased, thereby enabling miniaturization of the filter canister. Attached Figure Description

[0014] Figure 1 This is a schematic cross-sectional view of the filter tank in the embodiment.

[0015] Figure 2 yes Figure 1 A schematic cross-sectional view of the main body of the outer shell of the filter tank.

[0016] Figure 3A yes Figure 1 A schematic perspective view of the inner shell of the filter tank.

[0017] Figure 3B yes Figure 3A A schematic cross-sectional view of the inner shell.

[0018] Figure 4A as well as Figure 4B yes Figure 1 A modified example of the first adsorption chamber of the filter tank.

[0019] Figure 5Is with Figure 1 Schematic cross-sectional view of filter tanks in different implementations.

[0020] Figure 6A yes Figure 5 A schematic perspective view of the inner shell of the filter tank.

[0021] Figure 6B yes Figure 6A A schematic cross-sectional view of the inner shell.

[0022] Figure 7A yes Figure 5 A modified example of the first adsorption chamber of the filter tank.

[0023] Figure 7B yes Figure 5 A variation of the filter configuration of the filter tank.

[0024] Figure 8 yes Figure 5 Example of deformation of the inner shell of the filter tank. Detailed Implementation

[0025] Exemplary embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0026] [1. First Embodiment]

[0027] [1-1. Structure]

[0028] Figure 1 The filter canister 1 shown is an evaporative fuel treatment device that adsorbs and desorbs evaporative fuel generated in the fuel tank of a vehicle.

[0029] The filter tank 1 has an outer shell 2, an inner shell 3, a first adsorption chamber 4, a second adsorption chamber 5, a third adsorption chamber 6, a first adsorbent 7, a second adsorbent 8, and a third adsorbent 9.

[0030] <Outer shell>

[0031] The outer shell 2 is a shell having an internal space with an inner shell 3 and a third adsorption chamber 6, a filling port 21, a purging port 22, and an atmospheric port 23.

[0032] The filling port 21 is connected to the vehicle's fuel tank via a pipe. The filling port 21 is configured to guide the evaporated fuel generated in the fuel tank into the filter canister 1.

[0033] The purge port 22 is connected to the intake manifold of the vehicle's engine via a purge valve. The purge port 22 is configured to discharge evaporated fuel from the filter canister 1 and supply the evaporated fuel to the engine.

[0034] Atmospheric vent 23 opens to the atmosphere. Atmospheric vent 23 discharges the gas from which the evaporated fuel has been removed into the atmosphere. In addition, atmospheric vent 23 desorbs the evaporated fuel adsorbed in filter canister 1 by introducing external air (i.e., purging air) (i.e., purging).

[0035] The outer casing 2 has a main body 2A and a cover 2B. The main body 2A is provided with a filling port 21, a purging port 22, and an atmospheric port 23, and has an opening that allows the inner casing 3 to be inserted. The cover 2B is installed at the opening of the main body 2A.

[0036] like Figure 2 As shown, the main body 2A has a first space 2C in which the inner shell 3 is disposed, a second space 2D in which the third adsorption chamber 6 is disposed, and a connecting portion 2E forming a connecting path between the first space 2C and the second space 2D.

[0037] <Inner shell>

[0038] Figure 3A as well as Figure 3B The inner housing 3 shown is disposed inside the outer housing 2 and has an internal space that is connected to the atmospheric vent 23 in a communicating manner. The inner housing 3 is manufactured, for example, by resin molding using a mold.

[0039] Specifically, the inner housing 3 has a cylindrical body 31 and a sealing member 32. The cylindrical body 31 has a first end 31A that expands in a stepped manner toward the axially outward and a second end 31B that is flange-shaped.

[0040] The first end 31A is the end that connects to the atmospheric opening 23 (see reference). Figure 1 The first end portion 31A has a first enlarged diameter portion 31D and a second enlarged diameter portion 31E. The inner diameter of the first enlarged diameter portion 31D is larger than the inner diameter of the central space 31F, which is located inside the first end portion 31A. The inner diameter of the second enlarged diameter portion 31E is larger than the inner diameter of the first enlarged diameter portion 31D. In the central space 31F, a first adsorption chamber 4 is formed by distributing a first adsorbent 7.

[0041] The first enlarged diameter portion 31D is disposed adjacent to the central space 31F, and the first enlarged diameter portion 31D and the central space 31F are separated by, for example, a grid-like partition 31C. The first enlarged diameter portion 31D forms a space that connects the first adsorption chamber 4 and the second adsorption chamber 5.

[0042] A second diameter expansion section 31E is provided axially outward from the first diameter expansion section 31D. A second adsorption chamber 5 is formed in the second diameter expansion section 31E by distributing a second adsorbent 8.

[0043] The second end 31B is the end located on the opposite side of the first end 31A. That is, the second end 31B is the end that communicates with the third adsorption chamber 6. The outer diameter of the second end 31B is larger than the outer diameter of the portion of the cylinder 31 other than the second end 31B. However, the outer diameter of the second end 31B may be smaller than or equal to the outer diameter of the first end 31A.

[0044] A sealing member 32 is disposed on the outer peripheral surface of the second end 31B. The sealing member 32 is an elastic, annular component and is embedded in a groove provided on the outer peripheral surface of the second end 31B. The sealing member 32 is disposed in such a way as to fill the gap at the joint between the outer housing 2 and the inner housing 3.

[0045] As the sealing member 32, an O-ring, gasket, or the like can be used. The inner housing 3 is held in position relative to the outer housing 2 by the friction of the sealing member 32. Furthermore, in this embodiment, the inner housing 3 does not engage with the outer housing 2 at any point other than the sealing member 32. That is, in this embodiment, there is no weld point between the inner housing 3 and the outer housing 2. However, the inner housing 3 may also contact the outer housing 2 at any point other than the sealing member 32.

[0046] <First Adsorption Chamber>

[0047] like Figure 1 As shown, the first adsorption chamber 4 is disposed in the internal space of the inner shell 3 (specifically, the central space 31F).

[0048] The first adsorption chamber 4 houses the first adsorbent 7 and is connected to the third adsorption chamber 6, allowing gas to flow freely between the first adsorption chamber 4 and the third adsorption chamber 6 via the flow path formed by the outer shell 2. The first adsorption chamber 4 is arranged in parallel to the third adsorption chamber 6 in the radial direction, such that the gas flow direction is parallel to the third adsorption chamber 6.

[0049] The first adsorption chamber 4 is defined by a first filter 4A and a second filter 4B disposed inside the cylinder 31 of the inner housing 3. The first filter 4A contacts the partition 31C and separates the second adsorption chamber 5 and the first adsorption chamber 4.

[0050] The second filter 4B separates the first adsorption chamber 4 and the communication path between the first adsorption chamber 4 and the third adsorption chamber 6. The spring 4E presses the second filter 4B towards the second adsorption chamber 5 and the atmospheric opening 23 via a grid-like perforated element 4C. Furthermore, the perforated element 4C can be slit-shaped, porous, etc.

[0051] The first filter 4A and the second filter 4B defining the first adsorption chamber 4 are configured such that the first adsorbent 7 cannot pass through the first filter 4A and the second filter 4B, while allowing the gas to pass through the first filter 4A and the second filter 4B. That is, the filters 4A and 4B hold the first adsorbent 7 within the first adsorption chamber 4.

[0052] <Second Adsorption Chamber>

[0053] The second adsorption chamber 5 is disposed in the internal space of the inner shell 3 (specifically, inside the first end 31A).

[0054] The second adsorption chamber 5 houses the second adsorbent 8 and is positioned between the first adsorption chamber 4 and the atmospheric port 23 in the flow path of the evaporated fuel. The second adsorption chamber 5 is connected to the first adsorption chamber 4 and also to the atmospheric port 23. The gas flow direction in the second adsorption chamber 5 is parallel to the gas flow direction in the first adsorption chamber 4.

[0055] The area of ​​the cross-section perpendicular to the gas flow direction of the second adsorption chamber 5 is greater than the area of ​​the cross-section perpendicular to the gas flow direction of the first adsorption chamber 4. Furthermore, the length of the second adsorption chamber 5 in the gas flow direction is less than the length of the first adsorption chamber 4 in the gas flow direction. However, the length of the second adsorption chamber 5 in the gas flow direction may also be greater than the length of the first adsorption chamber 4 in the gas flow direction.

[0056] The second adsorption chamber 5 is defined by a filter 5A configured to block the first end 31A of the inner housing 3, and a step within the first end 31A. The filter 5A separates the space communicating with the atmospheric vent 23 from the second adsorption chamber 5. The filter 5A defining the second adsorption chamber 5 has the same function as the filters 4A and 4B of the first adsorption chamber 4.

[0057] The filter 5A is fixed to the outer housing 2 by, for example, ultrasonic welding. The inner housing 3 is inserted into the outer housing 2 such that the first end 31A presses against the filter 5A.

[0058] Alternatively, the filter 5A can be fixed to the inner housing 3 by, for example, ultrasonic welding. In this case, the filter 5A is installed onto the outer housing 2 by inserting it into the inner housing 3.

[0059] In this embodiment, the second adsorbent 8 is a block-shaped aggregate formed by solidifying granular adsorbent, or an aggregate of fibrous adsorbent. The surface of the second adsorbent 8 opposite to the atmospheric vent 23 is in contact with the step of the first end 31A. Therefore, a buffer space formed by the first enlarged diameter portion 31D is provided between the second adsorbent 8 and the partition 31C. No adsorbent is placed in this buffer space. Furthermore, when using the above-described block or aggregate second adsorbent 8, the filter 5A for retaining the adsorbent may not be provided.

[0060] In this embodiment, since welding is not performed in the second adsorption chamber 5, the separation of adsorbent clumps or aggregates due to vibration during welding can be suppressed. Furthermore, since the cross-sectional area of ​​the second adsorption chamber 5 is larger than that of the first adsorption chamber 4, even if clumps or aggregates with high ventilation resistance are used as the second adsorbent 8, the increase in ventilation resistance of the filter tank 1 can be suppressed.

[0061] Furthermore, the inner shell 3 is assembled into the main body 2A of the outer shell 2 in the state of a box filled with the second adsorbent 8. After assembling the inner shell 3, the first adsorbent 7 is filled in, and then the cover 2B of the outer shell 2 is installed into the main body 2A.

[0062] <Third Adsorption Chamber>

[0063] The third adsorption chamber 6 is disposed inside the outer shell 2 and outside the inner shell 3 (specifically, disposed in the second space 2D of the outer shell 2).

[0064] The third adsorption chamber 6 contains the third adsorbent 9, and both the filling port 21 and the purging port 22 are connected to the third adsorption chamber 6. The third adsorption chamber 6 adsorbs the evaporated fuel introduced from the filling port 21. In addition, the adsorbed evaporated fuel is discharged from the third adsorption chamber 6 through the purging port 22.

[0065] The third adsorption chamber 6 is defined by a first filter 6A and a second filter 6B respectively disposed inside the outer housing 2. The first filter 6A separates the third adsorption chamber 6 and the space that connects the filling port 21 and the purging port 22 connected to the third adsorption chamber 6.

[0066] The second filter 6B separates the third adsorption chamber 6 and the communication path between the third adsorption chamber 6 and the first adsorption chamber 4. A spring 6D presses the second filter 6B toward the filling port 21 and the purge port 22 via a grid-like perforated element 6C. Furthermore, the perforated element 6C can be slit-shaped, porous, etc.

[0067] The filters 6A and 6B that define the third adsorption chamber 6 have the same function as the filters 4A and 4B of the first adsorption chamber 4.

[0068] The evaporated fuel introduced through the filling port 21 is adsorbed by the third adsorbent 9 in the third adsorption chamber 6. The evaporated fuel that is not completely adsorbed in the third adsorption chamber 6 moves to the first adsorption chamber 4 inside the inner shell 3 and is adsorbed by the first adsorbent 7 in the first adsorption chamber 4.

[0069] Furthermore, any unadsorbed evaporated fuel in the first adsorption chamber 4 moves to the second adsorption chamber 5 within the inner shell 3, where it is adsorbed by the second adsorbent 8. The gas containing the adsorbed evaporated fuel is then discharged from the atmospheric outlet 23.

[0070] Furthermore, by introducing air through the atmospheric vent 23, the evaporated fuel adsorbed by the adsorbent in each of the first adsorption chamber 4, the second adsorption chamber 5, and the third adsorption chamber 6 is discharged into the engine through the purge port 22. This supplies air containing the evaporated fuel into the engine.

[0071] <Adsorbent>

[0072] The first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 each adsorb the evaporated fuel and / or butane supplied to the filter canister 1 along with air. The evaporated fuel and / or butane are desorbed by introducing external air. The desorbed evaporated fuel is then supplied to the engine.

[0073] Materials used as the first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 can include, for example, activated carbon and zeolite. Activated carbon can be, for example, aggregates of granular activated carbon, shaped activated carbon formed into a honeycomb structure, or activated carbon formed from fibrous activated carbon into sheets, cuboids, cylinders, or prisms. The first adsorbent 7, the second adsorbent 8, and the third adsorbent 9 can be the same type of adsorbent or different types of adsorbents.

[0074] <Modifications of the first embodiment>

[0075] like Figure 4A As shown, the first adsorption chamber 4 can be divided into multiple chambers using a separator filter 4D and along the flow path of the evaporated fuel. That is, the filter tank 1 can have multiple first adsorption chambers 4. The adsorbents disposed in the multiple first adsorption chambers 4 can be of the same type or different types.

[0076] In addition, such as Figure 4B As shown, the first adsorption chamber 4 can also be extended to the first diameter expansion section 31D. In this case, it is not configured... Figure 1 The first filter 4A, and the boundary between the first adsorbent 7 and the second adsorbent 8 is directly used as the boundary between the first adsorption chamber 4 and the second adsorption chamber 5.

[0077] [1-2. Effects]

[0078] The following effects can be obtained by implementing the methods described in detail above.

[0079] (1a) By inserting the inner shell 3 into the interior of the outer shell 2, a filter canister 1 with first adsorption chamber 4 and second adsorption chamber 5 having different cross-sectional areas can be obtained. Therefore, the number of welded parts in the shell of the filter canister 1 can be reduced. This reduces the manufacturing cost of the filter canister 1.

[0080] (1b) The third adsorption chamber 6 is disposed outside the inner housing 3, thereby making it easy to ensure the volume of the third adsorption chamber 6, which is provided as the main chamber.

[0081] (1c) The area of ​​the cross section of the second adsorption chamber 5 perpendicular to the gas flow direction is greater than the area of ​​the cross section of the first adsorption chamber 4 perpendicular to the gas flow direction. As a result, the manufacturing cost of the filter canister 1 can be reduced and the ventilation resistance of the filter canister 1 can be reduced.

[0082] (1d) The gas flow direction in the second adsorption chamber 5 is parallel to the gas flow direction in the first adsorption chamber 4, thereby simplifying the structure of the inner shell 3. This helps to reduce the manufacturing cost of the filter canister 1.

[0083] [2. Second Implementation]

[0084] [2-1. Structure]

[0085] Figure 5 The filter canister 101 shown adsorbs and desorbs evaporated fuel generated in the fuel tank. The filter canister 101 includes an outer shell 2, an inner shell 103, a first adsorption chamber 4, a second adsorption chamber 105, a third adsorption chamber 6, a first adsorbent 7, a second adsorbent 8, and a third adsorbent 9.

[0086] The outer shell 2 of filter tank 101, the first adsorption chamber 4, the third adsorption chamber 6, and the adsorbents 7, 8, and 9 Figure 1 The corresponding structure in the filter tank 1 is the same, therefore the same symbol is used and the description is omitted. Furthermore, in this embodiment, the outer shell 2 has the same shape as... Figure 1 Different, but with the same internal structure Figure 1 same.

[0087] <Inner shell>

[0088] The inner housing 103 is disposed inside the outer housing 2 and has an internal space that is connected to the atmospheric port 23 in a communicating manner. The inner housing 103 is manufactured, for example, by resin molding using a mold.

[0089] like Figure 6A as well as Figure 6BAs shown, the inner housing 103 has a cylindrical body 131 and a sealing member 132. The cylindrical body 131 has a first end 131A that changes the flow direction of the gas and a flange-shaped second end 131B.

[0090] The first end 131A is the end that connects to the atmospheric opening 23 (see reference). Figure 5 The first end portion 131A has a rotating portion 131D and an expanding portion 131E. The rotating portion 131D rotates the gas flow direction approximately 90° from the central space 131F. The inner diameter of the expanding portion 131E is larger than the inner diameter of the rotating portion 131D. In the central space 131F, a first adsorption chamber 4 is formed by distributing a first adsorbent 7.

[0091] The rotating part 131D is disposed adjacent to the central space 131F, and the rotating part 131D and the central space 131F are separated by a partition member 131C extending along the axial direction. The rotating part 131D forms a space that connects the first adsorption chamber 4 and the second adsorption chamber 105. The central axis of the cylinder 131 bends at the rotating part 131D.

[0092] An enlarged diameter section 131E is provided continuously from the rotating section 131D at a location axially outer of the rotating section 131D. A second adsorption chamber 105 is formed in the enlarged diameter section 131E by distributing a second adsorbent 8.

[0093] The second end 131B is the end located on the opposite side of the first end 131A. That is, the second end 131B is the end that communicates with the third adsorption chamber 6. The outer diameter of the second end 131B is larger than the outer diameter of the portion of the cylinder 131 other than the second end 131B. However, the outer diameter of the second end 131B may also be equal to or smaller than the outer diameter of the first end 131A.

[0094] A sealing member 132 is disposed on the outer peripheral surface of the second end 131B. The sealing member 132 is an elastic, annular component. The function of the sealing member 132 is the same as that of the sealing member 32 in the first embodiment.

[0095] <Second Adsorption Chamber>

[0096] like Figure 5 As shown, the second adsorption chamber 105 is disposed in the internal space of the inner housing 103 (specifically, inside the first end 131A).

[0097] The second adsorption chamber 105 houses the second adsorbent 8 and is positioned between the first adsorption chamber 4 and the atmospheric port 23 in the flow path of the evaporated fuel. The second adsorption chamber 105 is connected to the first adsorption chamber 4 and to the atmospheric port 23. The flow direction of the gas in the second adsorption chamber 105 intersects (specifically, is approximately orthogonal) the flow direction of the gas in the first adsorption chamber 4.

[0098] The area of ​​the cross-section of the second adsorption chamber 105 perpendicular to the gas flow direction is greater than the area of ​​the cross-section of the first adsorption chamber 4 perpendicular to the gas flow direction. Furthermore, the length of the second adsorption chamber 105 in the gas flow direction is less than the length of the first adsorption chamber 4 in the gas flow direction. However, the length of the second adsorption chamber 105 in the gas flow direction may also be greater than the length of the first adsorption chamber 4 in the gas flow direction.

[0099] The second adsorption chamber 105 is defined by a first filter 105A configured to block the first end 131A of the inner housing 103, and a step within the first end 131A. Furthermore, a second filter 105B is disposed between the first filter 105A and the atmospheric vent 23.

[0100] The first filter 105A separates the space communicating with the atmospheric vent 23 and the second adsorption chamber 105. The first filter 105A defining the second adsorption chamber 105 has the same function as the filters 4A and 4B of the first adsorption chamber 4.

[0101] In this embodiment, the first filter 105A is opposite to the inner wall of the outer housing 2. Therefore, the evaporated fuel after the addition of the second adsorption chamber 105 changes its flow direction due to collision with the inner wall.

[0102] The first filter 105A is pressed into the first end 131A. Furthermore, the second filter 105B is fixed to the outer housing 2 by, for example, ultrasonic welding. The inner housing 103 is inserted into the outer housing 2 such that the first end 131A presses against the second filter 105B.

[0103] In this embodiment, the second adsorbent 8 is a block-shaped aggregate or a fibrous aggregate of adsorbent formed by solidifying granular adsorbent. The surface of the second adsorbent 8 opposite to the atmospheric vent 23 contacts the step of the first end 131A. Therefore, a buffer space formed by the rotating part 131D is provided between the second adsorbent 8 and the separating member 131C. No adsorbent is placed in this buffer space. Furthermore, when using the second adsorbent 8 as described above, which is a block or aggregate, the first filter 105A for retaining the adsorbent may not be provided.

[0104] The gas that has passed through the first adsorption chamber 4 changes its flow direction at the rotating part 131D and enters the second adsorption chamber 105. Then, the gas that has passed through the second adsorption chamber 105 changes its flow direction again by means of the inner wall of the outer casing 2 opposite to the first filter 105A. After that, the gas is discharged from the atmospheric port 23.

[0105] <Modifications of the second embodiment>

[0106] like Figure 7A As shown, the first adsorption chamber 4 can be divided into multiple chambers using a separator filter 4D and along the flow path of the evaporated fuel. That is, the filter canister 101 can have multiple first adsorption chambers 4. The adsorbents disposed in the multiple first adsorption chambers 4 can be of the same type or different types.

[0107] In addition, such as Figure 7B As shown, the filter canister 101 may also not have a second filter 105B disposed between the atmospheric port 23 and the first filter 105A (see reference). Figure 5 In this embodiment, for example, the first filter 105A is fixed to the inner housing 103 by ultrasonic welding, and thus performs its function. Figure 5 The function of the second filter 105B.

[0108] In addition, such as Figure 8 As shown, the opening at the first end 131A of the inner shell 103 can also be quadrilateral.

[0109] [2-2. Effect]

[0110] The following effects can be obtained by implementing the methods described in detail above.

[0111] (2a) The gas flow direction in the second adsorption chamber 105 intersects with the gas flow direction in the first adsorption chamber 4, thereby increasing the degree of freedom in the external dimensions of the filter canister 101. This enables the miniaturization of the filter canister 101.

[0112] [3. Other Implementation Methods]

[0113] The embodiments of this disclosure have been described above. However, this disclosure is not limited to the above embodiments, and various embodiments can be adopted.

[0114] (3a) In the filter tank of the above embodiment, an auxiliary chamber for storing adsorbent may also be provided between the inner shell and the atmospheric vent. That is, the atmospheric vent may also be connected to the inner shell via another chamber (i.e., the auxiliary chamber).

[0115] (3b) The function of one constituent element in the above embodiments can be distributed among multiple constituent elements, or the functions of multiple constituent elements can be integrated into one constituent element. Furthermore, a portion of the structure of the above embodiments can be omitted. At least a portion of the structure of one embodiment can be added to the structure of other embodiments, or at least a portion of the structure of one embodiment can be substituted with the structure of other embodiments. Additionally, all forms encompassed by the technical concept defined by the statements in the claims are embodiments of this disclosure.

Claims

1. A filter canister for adsorbing and desorbing evaporated fuel generated in a vehicle's fuel tank, characterized in that, have: The outer casing has a charging port for introducing the evaporated fuel, a purging port for discharging the evaporated fuel, and an atmospheric port open to the atmosphere. An inner housing is disposed inside the outer housing and has an internal space that is directly connected to the vent or connected to the vent via other chambers; The first adsorption chamber is disposed in the internal space of the inner shell; The second adsorption chamber is disposed in the internal space of the inner shell at a position between the first adsorption chamber and the atmospheric vent in the flow path of the evaporated fuel. A first adsorbent, wherein the first adsorbent is contained in the first adsorption chamber; and The second adsorbent is contained in the second adsorption chamber, and The area of ​​the cross section perpendicular to the gas flow direction of the second adsorption chamber is greater than the area of ​​the cross section perpendicular to the gas flow direction of the first adsorption chamber.

2. The filter tank according to claim 1, characterized in that, It also has a third adsorption chamber and a third adsorbent. The third adsorption chamber is disposed inside the outer shell and outside the inner shell, and both the filling port and the purging port are connected to the third adsorption chamber. The third adsorbent is contained in the third adsorption chamber.

3. The filter tank according to claim 1, characterized in that, The gas flow direction in the second adsorption chamber is parallel to the gas flow direction in the first adsorption chamber.

4. A filter canister for adsorbing and desorbing evaporated fuel generated in a vehicle's fuel tank, characterized in that, have: The outer casing has a charging port for introducing the evaporated fuel, a purging port for discharging the evaporated fuel, and an atmospheric port open to the atmosphere. An inner housing is disposed inside the outer housing and has an internal space that is directly connected to the vent or connected to the vent via other chambers; The first adsorption chamber is disposed in the internal space of the inner shell; The second adsorption chamber is disposed in the internal space of the inner shell at a position between the first adsorption chamber and the atmospheric vent in the flow path of the evaporated fuel. A first adsorbent, wherein the first adsorbent is contained in the first adsorption chamber; and The second adsorbent is contained in the second adsorption chamber, and The area of ​​the cross-section perpendicular to the gas flow direction of the second adsorption chamber is different from the area of ​​the cross-section perpendicular to the gas flow direction of the first adsorption chamber. The gas flow direction in the second adsorption chamber intersects with the gas flow direction in the first adsorption chamber.

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