Filtering canister

Abstract

A filter can includes at least one chamber, an inlet, an atmospheric port, an outlet, and a plurality of rod-shaped portions. An adsorbent for fuel vapor is disposed in the at least one chamber. The plurality of rod-shaped portions are disposed at an elongated portion of a target chamber, which is any of the at least one chamber. The adsorbent disposed in the target chamber is formed as a plurality of granular components. At least a portion of the plurality of rod-shaped portions has at least one recess formed in an outer peripheral surface thereof.

Description

Technical Field

[0001] This disclosure relates to a filter canister for adsorbing fuel vapors generated from a fuel tank. Background Technology

[0002] As disclosed in Japanese Patent Application Publication No. 2018-96254, a technique is known in which multiple rod-shaped portions extending substantially parallel to the flow direction of fuel vapor are provided in the chamber of a filter canister in order to suppress ventilation resistance. Summary of the Invention

[0003] However, in recent years, due to improvements in fuel efficiency, vehicle engine displacement has tended to decrease, resulting in a reduction in the amount of purge air used to remove fuel buildup in the filter canister. Furthermore, to effectively remove fuel buildup in the filter canister with a small amount of purge air, it is necessary to reduce the filter canister's ventilation resistance.

[0004] Furthermore, in recent years, due to environmental measures, the performance requirements for filter canisters have become increasingly stringent. Generally, the performance of a filter canister improves with the increase of the L / D ratio. Here, L refers to the length of the filter canister chamber in the direction of gas flow, and D refers to the equivalent diameter of the cross-section of the chamber orthogonal to the direction of gas flow. However, as the L / D ratio increases, the ventilation resistance of the filter canister increases, resulting in a greater pressure loss.

[0005] One aspect of this disclosure is to reduce the ventilation resistance of the filter canister.

[0006] One aspect of this disclosure relates to a filter canister configured for installation on a vehicle with an engine. The filter canister includes at least one chamber, an inlet, an air outlet, an outlet, and a plurality of rod-shaped portions. An adsorbent for adsorbing fuel vapor is disposed in the at least one chamber. The inlet is configured to allow fuel vapor to flow from the vehicle's fuel tank into the at least one chamber. The air outlet is configured to allow air to flow from outside the vehicle into the at least one chamber. The outlet is configured to allow the fuel vapor adsorbed on the adsorbent to flow towards the engine via the air flowing in from the air outlet. The plurality of rod-shaped portions are elongated portions disposed in the target chamber, which can be any of the at least one chamber. The adsorbent disposed in the target chamber is formed into a plurality of granular components. At least a portion of the rod-shaped portions has at least one recess formed on its outer peripheral surface.

[0007] According to the above configuration, a gap is formed between the recess in the rod-shaped portion and the adsorbent, which consists of multiple granular components, in the target chamber. Therefore, the ventilation resistance of the filter canister can be suppressed.

[0008] In one embodiment of this disclosure, multiple rod-shaped portions may extend substantially parallel to the flow direction of the gas in the target chamber.

[0009] Based on the above configuration, in the target chamber, the gap between the recess of the rod-shaped portion and the adsorbent is formed along the gas flow direction. Therefore, the ventilation resistance of the filter canister can be further suppressed.

[0010] In one aspect of this disclosure, at least one recess may be a groove-shaped portion that extends substantially parallel to the extending direction of the rod-shaped portion on which the at least one recess is provided.

[0011] According to the above configuration, in the target chamber, the gap between the recess of the rod-shaped portion and the adsorbent is formed along the extending direction of the rod-shaped portion. Therefore, the ventilation resistance of the filter canister can be further suppressed.

[0012] In one embodiment of this disclosure, the plurality of granular components disposed in the target chamber as adsorbents can each be formed in a generally cylindrical shape. The width of at least one recess can be less than the diameter of the cross section orthogonal to the extension direction of each of the plurality of granular components.

[0013] Based on the above configuration, it is possible to suppress the entry of each particulate component, which serves as the adsorbent, into the inner side of the recess formed in the rod-shaped portion, thereby promoting the formation of a gap between the recess of the rod-shaped portion and the adsorbent. Therefore, it is possible to further suppress the ventilation resistance of the filter canister.

[0014] In one embodiment of this disclosure, a connecting portion may be included, which connects each of the plurality of rod-shaped portions to the other rod-shaped portions. The connecting portion may be provided at the ends of the plurality of rod-shaped portions.

[0015] Based on the above structure, it is easy to manufacture multiple rod-shaped parts and connecting parts. Furthermore, it can reduce the workload when placing the adsorbent in the target chamber.

[0016] In one embodiment of this disclosure, a connecting portion may be included, which connects each of the plurality of rod-shaped portions to the other rod-shaped portions. The connecting portion may be located at a position away from the ends of the plurality of rod-shaped portions.

[0017] According to the above configuration, the connection portion can be avoided from being located at the end of the object chamber, thereby suppressing the bias of the flow of air and fuel vapor at the end of the object chamber. As a result, the flow of air and fuel vapor can be made more uniform throughout the object chamber.

[0018] In one embodiment of this disclosure, the plurality of rod-shaped portions may include at least one specific rod-shaped portion. The at least one specific rod-shaped portion has at least one recess and may have at least two intervals arranged along the extension direction of the at least one specific rod-shaped portion. The shapes of the cross-sections of the at least one specific rod-shaped portion in adjacent intervals that are orthogonal to the extension direction may differ from each other.

[0019] Based on the above configuration, the ventilation resistance of the target room can be adjusted more flexibly.

[0020] In one aspect of this disclosure, the plurality of rod-shaped portions may include at least two types of rod-shaped portions. The shapes of the cross-sections of the various types of rod-shaped portions orthogonal to their extension directions may differ from one another.

[0021] Based on the above configuration, the ventilation resistance of the target room can be adjusted more flexibly.

[0022] In one aspect of this disclosure, at least a portion of the rod-shaped portions may have a plurality of recesses formed on their outer peripheral surfaces. Furthermore, in another aspect of this disclosure, each of the plurality of rod-shaped portions may have at least one recess formed therein.

[0023] Based on the above configuration, the ventilation resistance of the filter canister can be further suppressed. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of the filter tank of the first embodiment viewed from the side.

[0025] Figure 2 This is an explanatory diagram of the adsorbent composed of activated carbon particles in the first embodiment.

[0026] Figure 3 This is a front view of the grid component in the first embodiment.

[0027] Figure 4 This is a side view of the grid component according to the first embodiment.

[0028] Figure 5 This is a bottom view of the grid member of the first embodiment as seen from the first end side.

[0029] Figure 6 This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0030] Figure 7 This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0031] Figure 8 This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0032] Figure 9 This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0033] Figure 10 This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0034] Figure 11This is a cross-sectional view of the rod-shaped portion of the first embodiment, orthogonal to the extension direction.

[0035] Figure 12 This is a front view of the grid component in the second embodiment.

[0036] Figure 13 This is a side view of the grid component according to the second embodiment.

[0037] Figure 14 This is a bottom view of the grid member of the second embodiment as seen from the first end side. Detailed Implementation

[0038] The embodiments of this disclosure will now be described with reference to the accompanying drawings.

[0039] The embodiments disclosed herein are not limited to the embodiments described below, and various embodiments may be adopted within the scope of the technology to which this disclosure pertains.

[0040] [First Implementation]

[0041] [1. Composition of the filter tank]

[0042] The filter canister 1 of the first embodiment is installed in a vehicle (see reference). Figure 1 The vehicle equipped with the filter canister 1 will be referred to as "this vehicle" below. The filter canister 1 has a container 10 made of synthetic resin, the container 10 having a first chamber 20 to a third chamber 40, and each of the first chamber 20 to the third chamber 40 is provided with an adsorbent 60 to 62 for adsorbing fuel vapor. In addition, the number of chambers of the filter canister 1 may be, for example, two or less or four or more.

[0043] The adsorbent 60 in chamber 1 20 may be composed of, for example, powdered activated carbon or granules as described later.

[0044] Furthermore, the adsorbent 61 in chamber 2 30 is composed of granular activated carbon, i.e., granules (see reference). Figure 2 As an example, the particles are approximately cylindrical, and the diameter of the cross-section of the particle orthogonal to the extension direction (in other words, the axial direction) will be defined as R below. However, the shape of the particles is not limited to cylindrical; for example, it can also be spherical. Furthermore, when the particles are spherical, the diameter of the particles can also be defined as R. In addition, the adsorbent 61 can also be composed of granular adsorbents other than the particles.

[0045] Furthermore, as an example, the adsorbent 62 in the third chamber 40 can be composed of honeycomb activated carbon, which has lower ventilation resistance than powdered activated carbon and granular activated carbon. The honeycomb activated carbon has cylindrical sidewalls and is disposed in the third chamber 40 extending in the direction of gas flow. In addition, multiple flow paths penetrating the honeycomb activated carbon in the extending direction are provided on the inner side of the sidewalls.

[0046] Furthermore, the adsorbent 62 in the third chamber 40 can be composed of powdered activated carbon or granules. Additionally, the adsorbents 60 to 62 in the first to third chambers 40 can also be composed of materials other than activated carbon.

[0047] The container 10 is provided with an inlet 11, an outlet 12, and an air vent 13 at its end. The inlet 11 and the outlet 12 connect the interior of the first chamber 20 to the exterior of the container 10, and the air vent 13 connects the interior of the third chamber 40 to the exterior of the container 10.

[0048] The side of the container 10 of the filter tank 1 that has the inlet 11, the outlet 12, and the vent 13 will be referred to as the inlet side. Furthermore, the container 10 has an opening on the opposite side of the inlet side. This opening is closed by the cover member 14. The side opposite to the inlet side (in other words, the side where the cover member 14 is located) will be referred to as the cover side.

[0049] The inlet 11 is connected to the fuel tank of the vehicle's engine. Fuel vapor generated in the fuel tank flows into the interior of the filter canister 1 through the inlet 11 and is adsorbed in the adsorbents 60-62 in each chamber. As a result, fuel accumulates inside the filter canister 1.

[0050] Furthermore, outlet 12 is connected to the intake manifold of the vehicle's engine, and atmospheric outlet 13 is connected to the outside of the vehicle. Atmospheric air (in other words, purge air) flows into the interior of filter canister 1 through atmospheric outlet 13 by utilizing the engine's intake negative pressure. The flowing purge air desorbs the fuel adsorbed in adsorbents 60-62, and the desorbed fuel and purge air flow together from outlet 12 toward the intake manifold. Thus, purging is performed to remove the fuel adsorbed in adsorbents 60-62, thereby regenerating adsorbents 60-62.

[0051] That is, the fuel vapor that has flowed in from the inlet 11, the fuel vapor that flows out from the outlet 12 during purging, and the purging air that flows in from the atmospheric outlet 13 during purging flow in each of the chambers 20 to 40 in the direction where the ends on the inlet side and the ends on the cover side face each other.

[0052] As an example, the first chamber 20 is generally rectangular in shape, and the opening end of the first chamber 20 is connected to the inlet 11 and the outlet 12. In addition, filters 21 and 22 are respectively disposed at the opening end and the cover end of the first chamber 20, and an adsorbent 60 is disposed between the filters 21 and 22.

[0053] Furthermore, the end of the first chamber 20 on the cover side is connected to the channel 15. The channel 15 is provided along the cover member 14 and connects the first chamber 20 and the second chamber 30. A permeable perforated plate 23 is disposed between the filter 22 on the cover side of the first chamber 20 and the channel 15, and a helical spring 16 is disposed between the perforated plate 23 and the cover member 14. The helical spring 16 presses the perforated plate 23 towards the opening side. Therefore, inside the filter tank 1, fluid can travel back and forth between the first chamber 20 and the second chamber 30 via the channel 15.

[0054] Furthermore, both the second chamber 30 and the third chamber 40 are adjacent to the first chamber 20 and each has an elongated shape extending from the cap side to the opening side. Moreover, the second chamber 30 and the third chamber 40 are arranged end-to-end from the cap side to the opening side, and are separated by a permeable, plate-shaped partition member 18. Therefore, fluid can travel between the interior spaces of the second chamber 30 and the third chamber 40 through the partition member 18.

[0055] Furthermore, a filter 31 is provided at the end of the second chamber 30 on the cover side, and an adsorbent 61 is disposed between the filter 31 and the partition member 18. Additionally, a filter 41 is provided at the end of the third chamber 40 on the opening side, and an adsorbent 62 is disposed between the filter 41 and the partition member 18.

[0056] Furthermore, a permeable perforated plate 32 is disposed between the filter 31 and the channel 15 on the cover side of the second chamber 30, and a coil spring 17 is disposed between the perforated plate 32 and the cover member 14. The coil spring 17 presses the perforated plate 32 toward the opening side. In addition, the opening side end of the third chamber 40 is connected to the atmospheric opening 13.

[0057] [2. Grid Component]

[0058] In the first embodiment, as an example, the second chamber 30 is configured as an object chamber, and a grid member 5 (see reference) is provided in the second chamber 30. Figure 1 As an example, the grid member 5 is integrally formed of resin, and the grid member 5 includes a plurality of rod-shaped portions 50, a first connecting portion 52 and a second connecting portion 53, and a first isolation portion 54 and a second isolation portion 55 (see reference). Figures 3-5 Alternatively, the grid component 5 can also be made of materials other than resin.

[0059] The plurality of rod-shaped portions 50 are elongated portions that extend substantially parallel to each other at intervals. As an example, the plurality of rod-shaped portions 50 are arranged in a manner forming a first row 5C to a third row 5E. The plurality of rod-shaped portions 50 have substantially the same length and are arranged in the entire region of the second chamber 30 in a manner that extends substantially parallel to the gas flow direction. The first end 5A of each rod-shaped portion 50 is located at or near the end of the second chamber 30 on the opening side, and the second end 5B is located at or near the end of the second chamber 30 on the cover side.

[0060] Furthermore, the number of rows of multiple rod-shaped portions 50 and the number of rod-shaped portions 50 arranged in each row can be appropriately specified according to the size of the chamber for which the grid member 5 is configured. In addition, the first end 5A of each rod-shaped portion 50 can be located at the end on the cover side of the second chamber 30, and the second end 5B can be located at the end on the opening side.

[0061] Furthermore, the outer peripheral surface of each rod-shaped portion 50 can be made parallel to the extending direction while keeping the thickness (in other words, the area of ​​the cross-section) of each rod-shaped portion 50 constant, or the outer peripheral surface of each rod-shaped portion 50 can be made inclined relative to the extending direction. More specifically, the outer peripheral surface of each rod-shaped portion 50 can be inclined relative to the extending direction by tapering from the first connecting portion 52 and the second connecting portion 53 toward the end.

[0062] The first connecting portion 52 and the second connecting portion 53 are disposed at approximately the center of each rod-shaped portion 50 in the extending direction, and connect each rod-shaped portion 50 to at least one other rod-shaped portion 50. As an example, the first connecting portion 52 and the second connecting portion 53 connect each rod-shaped portion 50 of the first column 5C and the third column 5E to the rod-shaped portion 50 of the second column 5D closest to that rod-shaped portion. Furthermore, the first connecting portion 52 and the second connecting portion 53 connect each rod-shaped portion 50 of the second column 5D to one or two other rod-shaped portions 50 adjacent to that rod-shaped portion 50 in the second column 5D.

[0063] Furthermore, the first connecting portion 52 is located at a position closer to the first end 5A than the center of the rod-shaped portion 50 in the extending direction, and the second connecting portion 53 is located at a position closer to the second end 5B than the center. However, the positions of the first connecting portion 52 and the second connecting portion 53 are not limited to these positions; their positions can be appropriately specified. Preferably, the first connecting portion 52 and the second connecting portion 53 are located away from the ends of the plurality of rod-shaped portions 50 (in other words, the ends of the second chamber 30).

[0064] The first isolation portion 54 is a portion that separates the plurality of rod-shaped portions 50 from the inner wall of the second chamber 30, and the first isolation portion 54 is disposed at approximately the center in the extending direction of each of the rod-shaped portions 50 located at both ends of the first column 5C and the third column 5E. The first isolation portion 54 protrudes from the outer peripheral surface of the rod-shaped portion 50 toward the inner wall of the second chamber 30 and abuts against the inner wall of the second chamber 30.

[0065] Furthermore, the second isolation portion 55 is a portion that separates the plurality of rod-shaped portions 50 from the inner wall of the second chamber 30, and the second isolation portion 55 is provided at the first end 5A of the two rod-shaped portions 50 located in the center of each of the first column 5C and the third column 5E. The second isolation portion 55 has a first portion that abuts against the inner wall of the second chamber 30, and a second portion that connects the first portion to the outer peripheral surface of each of the two rod-shaped portions 50.

[0066] Alternatively, either chamber 1 20 or chamber 3 40 can be configured as the target chamber for the grid member 5, or two or more of chambers 1 20 to 3 40 can be configured as target chambers. Furthermore, a granular adsorbent, such as granules, is disposed in the target chamber.

[0067] [3. Details of the rod-shaped part]

[0068] At least one recess 51 is formed on the outer peripheral surface of each rod-shaped portion 50 in the grid member 5 (see reference). Figures 3-5 As an example, the recess 51 is a groove-shaped portion that extends from or near the first end 5A to or near the second end 5B in a manner substantially parallel to the extending direction of the rod-shaped portion 50. Furthermore, the grid member 5 may use rod-shaped portions 50 of various shapes.

[0069] Specifically, for example, each rod-shaped portion 50 can be formed in such a way that the cross section (hereinafter referred to as the cross section) orthogonal to the extension direction of each rod-shaped portion 50 is approximately circular, and a plurality of recesses 51 are formed on the outer peripheral surface of each rod-shaped portion 50 in such a way that they are arranged at approximately equal intervals along the edge of the cross section (see reference). Figure 6 ).

[0070] Furthermore, for example, each rod-shaped portion 50 can be formed such that its cross-section is approximately square, and a recess 51 is formed at each of the four corners of the cross-section on the outer peripheral surface of each rod-shaped portion 50 (see reference). Figure 7 ).

[0071] Furthermore, for example, each rod-shaped portion 50 can be formed in such a way that the cross-section is approximately rectangular, and a plurality of recesses 51 can be formed on the outer peripheral surface of each rod-shaped portion 50 in such a way that they are arranged at approximately equal intervals along the edge of the cross-section (see reference). Figure 8 ).

[0072] Furthermore, for example, each rod-shaped portion 50 can be formed in such a way that the cross-section is X-shaped, and a plurality of recesses 51 can be formed on the outer peripheral surface of each rod-shaped portion 50 in such a way that they are arranged at approximately equal intervals along the edge of the cross-section (see reference). Figure 9 ).

[0073] Furthermore, for example, each rod-shaped portion 50 can be formed in a way that makes the cross-section a curved rectangular shape, and a plurality of recesses 51 can be formed on the outer peripheral surface of each rod-shaped portion 50 in such a way that they are arranged at approximately equal intervals along the edge of the cross-section (see reference). Figure 10 ).

[0074] Furthermore, the width W of the recess 51 is smaller than the cross-sectional diameter R of the adsorbent 61, which is composed of cylindrical particles. However, this is not a limitation; the width W of the recess 51 can be appropriately specified, and it can also be greater than or equal to the cross-sectional diameter R of the adsorbent 61. Additionally, each rod-shaped portion 50 may also have a recess 51.

[0075] [4. Examples of deformation of the rod-shaped part]

[0076] In addition, the grid member 5 can be constructed from two or more rod-shaped portions 50 with different cross-sectional shapes (in other words, different numbers, positions, sizes, and / or shapes of the recesses 51). Specifically, for example, different types of first to third rod-shaped portions can be provided, and the first to third rod-shaped portions can be arranged in the first column 5C to the third column 5E respectively (see reference). Figure 4 , 5 ).

[0077] Alternatively, at least one recess 51 may be formed in all of the first to third rod-shaped portions, or one or two of the first to third rod-shaped portions may not have a recess 51 formed. Furthermore, as an example, the cross-section of the rod-shaped portion 50 without a recess 51 may be circular (see reference). Figure 11 Furthermore, each of the first to third rod-shaped portions may have the following characteristics: Figures 6-10 The cross-section shown is arbitrary. Furthermore, two or more rod-shaped sections with different cross-sectional shapes can be arranged in each column.

[0078] Furthermore, at least a portion of the multiple rod-shaped portions 50 can be configured as a specific rod-shaped portion. The specific rod-shaped portion has multiple intervals arranged along its extension direction. The cross-sectional shapes of adjacent intervals are different from each other. Furthermore, the cross-sectional shapes of each interval within the specific rod-shaped portion can be different from each other. Specifically, for example, the specific rod-shaped portion may have a boundary at the portion where the first connecting portion 52 or the second connecting portion 53 is provided, and a first interval 50A is provided at a position closer to the first end 5A than the boundary, and a second interval 50B is provided at a position closer to the second end 5B than the boundary (see reference). Figure 3 , 4Of course, the junction can also be provided at a position in a specific rod-shaped portion that is different from the first connecting portion 52 or the second connecting portion 53.

[0079] Alternatively, at least one recess 51 may be formed in both the first interval 50A and the second interval 50B, or no recess 51 may be formed in one of the intervals 50A and 50B. Furthermore, each of the first interval 50A and the second interval 50B having at least one recess 51 may have the following characteristics: Figures 6-10 The arbitrary cross-section shown.

[0080] Furthermore, the grid member 5 can be constructed from at least one specific rod-shaped portion and at least one rod-shaped portion 50 (hereinafter referred to as a general rod-shaped portion) with substantially the same cross-sectional shape from the first end 5A to the second end 5B. In this case, the grid member 5 may have two or more specific rod-shaped portions with different cross-sectional shapes in at least one interval, or it may have two or more general rod-shaped portions with different cross-sectional shapes.

[0081] Furthermore, as described above, it is assumed that the outer peripheral surface of each rod-shaped portion 50 is inclined relative to the extending direction, and the thickness of each rod-shaped portion 50 is not constant. In this case, the cross-sections of the rod-shaped portions 50 located at different positions in the extending direction have approximately the same shape but different sizes (in other words, similar cross-sections). It should be further clarified that the aforementioned cross-sections do not belong to the category of "cross-sections with different shapes" mentioned above.

[0082] [Second Implementation]

[0083] [5. Grid Component]

[0084] Next, the filter tank 1 of the second embodiment will be described. The filter tank 1 of the second embodiment differs from that of the first embodiment in the structure of the grid member 7. The filter tank 1 of the second embodiment will be described below in terms of the differences from the first embodiment.

[0085] Similar to the first embodiment, as an example, the grid member 7 is integrally formed of resin, and the grid member 7 includes a plurality of rod-shaped portions 70 and connecting portions 72 (see reference). Figures 12-14 Alternatively, the grid component 7 can also be made of materials other than resin.

[0086] The plurality of rod-shaped portions 70 have the same structure as in the first embodiment, and like in the first embodiment, the plurality of rod-shaped portions 70 are also disposed in the chamber of the filter canister 1. Furthermore, like in the first embodiment, the plurality of rod-shaped portions 70 may be provided with at least one recess 71, and the cross-sectional shape of each rod-shaped portion 70 may be specified in the same manner as in the first embodiment.

[0087] On the other hand, the grid member 7 in the second embodiment differs from that in the first embodiment in the structure of the connecting portion 72. That is, the connecting portion 72 is provided at the first end 7A of each rod-shaped portion 70, and the connecting portion 72 connects each rod-shaped portion 70 to at least one other rod-shaped portion 70. Alternatively, the connecting portion 72 may also be provided at the second end 7B of each rod-shaped portion 70.

[0088] In addition, similar to the first embodiment, an isolation portion (not shown) for separating the plurality of rod-shaped portions 70 from the inner wall of the second chamber 30 may also be provided on the grid member 7 of the second embodiment.

[0089] [6. Effects]

[0090] (1) According to the above embodiment, in the second chamber 30, which serves as the target chamber, gaps are formed between the recesses 51, 71 formed by the plurality of rod-shaped portions 50, 70 and the adsorbent 61, which serves as the material particles. Therefore, the ventilation resistance of the filter canister 1 can be suppressed. As a result, the increase in pressure loss can be suppressed, and the L / D ratio of the filter canister 1 can be improved.

[0091] Furthermore, in the above embodiment, honeycomb carbon was used as the adsorbent 62 in the third chamber 40 as an example to suppress ventilation resistance. However, honeycomb carbon is more expensive than powdered activated carbon or granules. To address this, the ventilation resistance of the second chamber 30 is suppressed by arranging grid components 5 and 7 in the second chamber 30, thereby achieving miniaturization of the honeycomb carbon and reducing the cost of the filter canister 1.

[0092] (2) Furthermore, the multiple rod-shaped portions 50, 70 extend approximately parallel to the gas flow direction in the second chamber 30. Therefore, in the second chamber 30, gaps are formed between the recesses 51, 71 of the multiple rod-shaped portions 50, 70 and the adsorbent 61 along the gas flow direction. This further suppresses the ventilation resistance of the filter canister 1.

[0093] (3) Furthermore, the recesses 51 and 71 are groove-shaped portions that extend substantially parallel to the extending directions of the plurality of rod-shaped portions 50 and 70. Therefore, in the second chamber 30, the gap between the recesses 51 and 71 and the adsorbent 61 is formed along the extending directions of the plurality of rod-shaped portions 50 and 70. This further suppresses the ventilation resistance of the filter canister 1.

[0094] (4) Furthermore, the width W of the recesses 51 and 71 is smaller than the cross-sectional diameter R of the particles that serve as adsorbent 61. Therefore, it is possible to suppress the entry of particles into the inner side of the recesses 51 and 71, thereby promoting the formation of gaps between the recesses 51 and 71 and the particles. This further suppresses the ventilation resistance of the filter tank 1.

[0095] (5) Furthermore, in the first embodiment, the first connecting portion 52 and the second connecting portion 53 are located approximately at the center of the plurality of rod-shaped portions 50. Therefore, it is possible to suppress the flow of air and fuel vapor from becoming biased at the end of the second chamber 30. As a result, it is possible to promote a more uniform flow of air and fuel vapor throughout the second chamber 30.

[0096] (6) Furthermore, in the second embodiment, the connecting portion 72 is provided at the ends of the plurality of rod-shaped portions 70. Therefore, for example, when the grid member 7 is formed as an integral component by injection molding or the like, it is easy to manufacture the grid member 7.

[0097] Furthermore, during the manufacturing process of the filter tank 1, after the grid member 7 is arranged in the second chamber 30 through the opening of the container 10 such that the connecting part 72 is located on the opening side, the adsorbent 61 can be disposed in the second chamber 30 through the opening. Therefore, the workload when disposing of the adsorbent 61 in the second chamber 30 can be reduced.

[0098] (7) Furthermore, the grid components 5 and 7 can be composed of two or more rod-shaped parts 50 and 70 with different cross-sectional shapes, and can include at least one specific rod-shaped part. As a result, the ventilation resistance of the target chamber can be adjusted more flexibly.

[0099] [7. Other Implementation Methods]

[0100] (1) In the above embodiments, the grid members 5 and 7 can be configured such that a plurality of rod-shaped portions 50 and 70 extend in a direction different from the gas flow direction (e.g., a direction substantially perpendicular to the gas flow direction). Furthermore, the plurality of rod-shaped portions 50 and 70 of the grid members 5 and 7 can have a curved shape, can have different lengths, and can extend in different directions.

[0101] (2) Furthermore, the recesses 51, 71 formed on the plurality of rod-shaped portions 50, 70 can be formed as groove-shaped portions extending in a direction different from the extension direction. Specifically, for example, the recesses 51, 71 can extend circumferentially on the cross-section of the rod-shaped portions 50, 70, or they can extend spirally. In addition, the recesses 51, 71 are not limited to being groove-shaped; for example, the recesses 51, 71 can be formed as a plurality of point-shaped regions on the outer peripheral surface of the rod-shaped portions 50, 70.

[0102] (3) In the above embodiments, the multiple functions of one constituent element can be implemented by multiple constituent elements, or the single function of one constituent element can be implemented by multiple constituent elements. Furthermore, the multiple functions of multiple constituent elements can be implemented by one constituent element, or one constituent element can implement the single function implemented by multiple constituent elements. Additionally, a portion of the configuration of the above embodiments can be omitted. Furthermore, at least a portion of the configuration of the above embodiments can be added to the configuration of other embodiments, or at least a portion of the configuration of the above embodiments can be substituted with the configuration of other embodiments.

Claims

1. A filter canister configured for installation on a vehicle having an engine, characterized in that, have: At least one chamber, wherein the at least one chamber is provided with an adsorbent for adsorbing fuel vapors; An inlet, configured to allow fuel vapor to flow from the vehicle's fuel tank into the at least one chamber; An air vent, configured to allow air to flow from outside the vehicle into the at least one chamber; An outlet is configured to allow fuel vapor adsorbed on the adsorbent to flow toward the engine through the air flowing in from the atmospheric inlet; Multiple rod-shaped portions, the multiple rod-shaped portions being elongated and disposed in an object chamber, the object chamber being any one of the at least one chambers; as well as A connecting portion, wherein each of the plurality of rod-shaped portions is connected to the other rod-shaped portions, and The adsorbent disposed in the target chamber is formed into a plurality of granular components. At least a portion of the rod-shaped portions has at least one recess formed on its outer peripheral surface. The connecting portion is located at the end of the plurality of rod-shaped portions.

2. A filter canister configured to be installed on a vehicle having an engine, characterized in that, have: At least one chamber, wherein the at least one chamber is provided with an adsorbent for adsorbing fuel vapors; An inlet, configured to allow fuel vapor to flow from the vehicle's fuel tank into the at least one chamber; An air vent, configured to allow air to flow from outside the vehicle into the at least one chamber; An outlet is configured to allow fuel vapor adsorbed on the adsorbent to flow toward the engine through the air flowing in from the atmospheric inlet; as well as A plurality of rod-shaped portions, the plurality of rod-shaped portions being elongated, are disposed in an object chamber, the object chamber being any one of the at least one chambers, and The adsorbent disposed in the target chamber is formed into a plurality of granular components. At least a portion of the rod-shaped portions has at least one recess formed on its outer peripheral surface. The plurality of rod-shaped portions extend approximately parallel to the flow direction of the gas in the target chamber. The at least one recess is a groove-shaped portion that extends substantially parallel to the extending direction of the rod-shaped portion on which the at least one recess is provided. The plurality of granular components disposed in the target chamber as adsorbents are each activated carbon particles formed in a generally cylindrical shape. The width of the at least one recess is less than the diameter of the cross section orthogonal to the extension direction of each of the plurality of granular components.

3. The filter tank according to claim 1 or 2, characterized in that, The plurality of rod-shaped portions includes at least one specific rod-shaped portion. The at least one specific rod-shaped portion is provided with the at least one recess, and has at least two intervals arranged along the extending direction of the at least one specific rod-shaped portion. The cross-sections of at least one particular rod-shaped portion in adjacent intervals that are orthogonal to the extension direction have different shapes from each other.

4. The filter tank according to claim 1 or 2, characterized in that, The plurality of rod-shaped portions include at least two types of rod-shaped portions. The shapes of the cross sections of the rod-shaped portions of each type that are orthogonal to the extension direction of the rod-shaped portion are different from each other.

5. The filter tank according to claim 1 or 2, characterized in that, At least a portion of the rod-shaped portions have multiple recesses formed on their outer peripheral surfaces.

6. The filter tank according to claim 1 or 2, characterized in that, Each of the plurality of rod-shaped portions has at least one recess.

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