Filtering tank

Abstract

The present disclosure provides a canister. The canister is provided with at least one chamber, an inflow port, an atmosphere port, an outflow port, and a housing member. An adsorbent that adsorbs fuel vapor is disposed in at least one of the chambers. The housing part is one of the at least one chamber and forms a specific chamber in which the particulate adsorbent is disposed. In addition, the housing member has a side wall portion and at least one protruding portion. The side wall portion extends from a first end portion to a second end portion in the specific chamber in the flow direction of the fluid, and forms an inner circumferential surface of the specific chamber. The at least one protruding portion is formed integrally with the side wall portion and protrudes from the inner peripheral surface of the side wall portion.

Description

Technical Field

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

[0002] As described in Japanese Patent Application Publication No. 2022-164344 and Japanese Patent Application Publication No. 2022-164345, there is a known technique of arranging a component having a plurality of rod-shaped portions extending in the same direction in a chamber of a filter tank in which a granular adsorbent is arranged. According to the above technique, a gap is formed between each rod-shaped portion of the component and the granular adsorbent arranged in the chamber, and as a result, ventilation resistance can be reduced. Summary of the invention

[0003] However, in the chamber of the filter tank, the flow of the fluid tends to stagnate near the wall surface forming the chamber. In this regard, in the technology disclosed in Japanese Patent Publication No. 2022-164344 and Japanese Patent Publication No. 2022-164345, the rod-shaped portion is mainly located in the center of the chamber. Moreover, the rod-shaped portion is formed as a component separate from the shell, which may increase the number of components constituting the filter tank.

[0004] In one aspect of the present disclosure, it is desirable to suppress the ventilation resistance of the canister while suppressing an increase in the number of components.

[0005] One scheme of the present disclosure is a canister configured to be installed in a vehicle having an engine, the canister comprising at least one chamber, an inlet, an atmospheric port, an outlet, and a shell member. An adsorbent for adsorbing fuel vapor is disposed in at least one chamber. The inlet is configured to allow fuel vapor to flow from a fuel tank of the vehicle into the at least one chamber. The atmospheric port is configured to be open to the atmosphere. The outlet is configured to allow the fuel vapor adsorbed in the adsorbent to flow out toward the engine through the atmosphere flowing in from the atmospheric port. The shell member is one of the at least one chamber and forms a specific chamber in which a granular adsorbent is disposed. In addition, the shell member has a side wall portion and at least one protrusion. The side wall portion extends from a first end portion in the flow direction of the fluid in the specific chamber to a second end portion and forms an inner peripheral surface of the specific chamber. At least one protrusion is a portion formed integrally with the side wall portion and is a portion protruding from the inner peripheral surface of the side wall portion.

[0006] According to the above configuration, a gap is formed between at least one protrusion formed integrally with the side wall and the granular adsorbent around the inner peripheral surface of the specific chamber, thereby promoting the flow of fluid around the inner peripheral surface. Thus, the increase in the number of components can be suppressed, and the ventilation resistance of the filter tank can be suppressed.

[0007] In one embodiment of the present disclosure, either the inlet and outlet may be provided at the first end of the specific chamber, or the air port may be provided at the first end of the specific chamber. At least one protrusion may extend from the first end of the specific chamber along the flow direction.

[0008] According to the above configuration, the flow of the fluid around the inner peripheral surface of the specific chamber can be further promoted, thereby suppressing the ventilation resistance of the canister.

[0009] In one aspect of the present disclosure, at least one protrusion may extend in a straight line.

[0010] According to the above configuration, the ventilation resistance of the canister can be suppressed favorably.

[0011] In one aspect of the present disclosure, the canister may further include an outer shell, which is a component forming the outer peripheral surface of the canister and having at least one chamber disposed therein. The shell component may be a component disposed inside the outer shell.

[0012] According to the above configuration, it is possible to suppress the ventilation resistance of the canister while suppressing an increase in the number of components.

[0013] In one aspect of the present disclosure, a plurality of protrusions may be arranged on the inner peripheral surface of the side wall portion so as to surround the specific cavity.

[0014] According to the above configuration, the flow of the fluid around the inner peripheral surface can be further promoted, thereby further suppressing the ventilation resistance of the canister.

[0015] In one embodiment of the present disclosure, the inlet and outlet may be disposed at the first end of the specific chamber, or the air port may be disposed at the first end of the specific chamber. The height of at least one protrusion from the inner circumference to the top of the protrusion may increase as it approaches the first end.

[0016] In a chamber provided with a port, an area where the fluid flows relatively well is considered to be an area fanning out from the port along the flow direction of the fluid. In this regard, according to the above configuration, the protrusion can be arranged in an area where the fluid flow is relatively poor, thereby promoting the flow of the fluid in this area. In this way, the ventilation resistance of the filter tank can be further suppressed.

[0017] In one embodiment of the present disclosure, either the inlet and outlet may be provided at the first end of the specific chamber, or the air port may be provided at the first end of the specific chamber. The side wall portion may have a reduction portion located at the periphery of the first end of the specific chamber. The reduction portion may be configured such that the area of ​​the cross section orthogonal to the flow direction in the specific chamber decreases as it approaches the first end. At least one protrusion may be provided at the reduction portion.

[0018] According to the above configuration, the flow of the fluid can be promoted by the shape of the constricted portion in addition to the protruding portion inside the constricted portion of the specific chamber, thereby suppressing the ventilation resistance of the canister.

[0019] In one aspect of the present disclosure, at least one protrusion may extend from at least a first end to a second end of the narrowing portion in the flow direction.

[0020] According to the above configuration, the ventilation resistance of the canister can be suppressed favorably. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a cross-sectional view of the canister according to the first embodiment, taken along the flow direction of the fluid.

[0022] Figure 2 This is a cross-sectional view of the first chamber of the canister according to the first embodiment, taken in a direction perpendicular to the flow direction of the fluid.

[0023] Figure 3 This is a cross-sectional perspective view of the protruding portion in the canister according to the first embodiment.

[0024] Figure 4 This is a cross-sectional perspective view of the protruding portion in the canister according to the first embodiment.

[0025] Figure 5 This is a cross-sectional perspective view of the protruding portion in the canister according to the first embodiment.

[0026] Figure 6 This is a cross-sectional view of the canister according to the second embodiment, taken along the flow direction of the fluid.

[0027] Figure 7 It is a cross-sectional view of the reduced portion of the canister according to the third embodiment, taken along the flow direction of the fluid.

[0028] Figure 8 It is a cross-sectional view of the reduced portion of the modified example along the flow direction of the fluid.

[0029] Fig. 9 It is a cross-sectional view of the reduced portion of the modified example along the flow direction of the fluid.

[0030] Fig.10 It is a cross-sectional view of the reduced portion of the modified example along the flow direction of the fluid. DETAILED DESCRIPTION

[0031] Embodiments of the present disclosure will be described below with reference to the drawings.

[0032] 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.

[0033] [1. First embodiment]

[0034] [(1) Structure of filter tank]

[0035] The canister 1 of the first embodiment is mounted on a vehicle (see Figure 1 ). The canister 1 has an outer shell 10 made of resin forming the outer peripheral surface of the canister 1, and a first chamber 20 and a second chamber 30 are provided inside the outer shell 10. An adsorbent 4 for adsorbing fuel vapor is arranged in the above chambers. In addition, the number of chambers in the canister 1 can be, for example, one or more than three.

[0036] An inlet 11, an outlet 12, and an air port 13 are provided at the end of the outer shell 10. Hereinafter, the side of the outer shell 10 of the filter tank 1 on which the inlet 11, the outlet 12, and the air port 13 are provided is referred to as the port side. In addition, the outer shell 10 has an opening on the side opposite to the port side. The opening is closed by a cover member 14. Hereinafter, the side opposite to the port side (in other words, the side on which the cover member 14 is provided) is referred to as the cover side.

[0037] The first chamber 20 forms a space of a substantially rectangular parallelepiped shape extending from the port side to the cover side, and an inlet 11 and an outlet 12 are provided at the end portion on the port side (hereinafter referred to as the first end portion F), and the inlet 11 and the outlet 12 communicate the first chamber 20 with the outside of the filter tank 1. In addition, the shape of the space in the first chamber 20 is not limited to a substantially rectangular parallelepiped shape, and may be, for example, cylindrical. In addition, a filter 21 and a filter 22 are respectively arranged at the first end portion F and the end portion on the cover side (hereinafter referred to as the second end portion S) of the first chamber 20, and an adsorbent 4 is arranged between the filter 21 and the filter 22. The second end portion S of the first chamber 20 is connected to the connecting passage 15. Moreover, a permeable porous plate 23 is arranged between the filter 22 on the cover side of the first chamber 20 and the connecting passage 15, and a coil spring 16 is arranged between the porous plate 23 and the cover member 14. The coil spring 16 presses the porous plate 23 toward the port side.

[0038] In addition, the second chamber 30 is adjacent to the first chamber 20, and the volume of the second chamber 30 is smaller than that of the first chamber 20, and has a shape of an elongated cylindrical shape extending from the cover side to the port side. In addition, the shape of the second chamber 30 is not limited to a cylindrical shape, and may be, for example, a prism shape. An atmospheric port 13 is provided at the end of the second chamber 30 located on the port side (hereinafter referred to as the first end F), and the atmospheric port 13 connects the second chamber 30 with the outside of the filter tank 1. Similar to the first chamber 20, a filter 31 and a filter 32 are respectively arranged at the first end F and the end located on the cover side (hereinafter referred to as the second end S) of the second chamber 30, and an adsorbent 4 is arranged between the filter 31 and the filter 32. In addition, the second end S of the second chamber 30 is connected to the connecting channel 15, and a porous plate 33 is arranged between the filter 32 located on the cover side of the second chamber 30 and the connecting channel 15. Further, similarly to the first chamber 20 , the coil spring 17 is disposed between the porous plate 33 and the cover member 14 , and the porous plate 33 is pressed toward the port side by the coil spring 17 .

[0039] Furthermore, the connection passage 15 is provided along the cover member 14 , and the connection passage 15 connects the first chamber 20 and the second chamber 30 to each other. Therefore, inside the canister 1 , the fluid can reciprocate between the first chamber 20 and the second chamber 30 via the connection passage 15 .

[0040] The inlet 11 is connected to a fuel tank of the vehicle engine. Fuel vapor generated in the fuel tank flows into the canister 1 through the inlet 11 and is adsorbed by the adsorbent 4 in each chamber. Thus, fuel is accumulated in the canister 1.

[0041] In addition, the outflow port 12 is connected to the intake pipe of the engine of the vehicle, and the atmospheric port 13 is connected to the outside of the vehicle and is open to the atmosphere. Moreover, due to the negative pressure of the intake of the engine, air (in other words, purge air) flows into the interior of the canister 1 through the atmospheric port 13. Due to the inflow of the purge air, the fuel vapor adsorbed on the adsorbent 4 is desorbed, and the desorbed fuel vapor flows from the outflow port 12 to the intake pipe together with the purge air. Thus, the fuel vapor adsorbed on the adsorbent 4 is removed by purging, and the adsorbent 4 is regenerated.

[0042] Furthermore, in the first chamber 20 and the second chamber 30 , fuel vapor and purge air (hereinafter also referred to as fluid) flow in the direction in which the first end F and the second end S are opposed to each other.

[0043] [(2) Protrusion]

[0044] The first chamber 20 and the second chamber 30 are configured as specific chambers. A plurality of protrusions 25 are provided on the side wall 24 of the first chamber 20, and a plurality of protrusions 35 are provided on the side wall 34 of the second chamber 30 (see Figure 1 ) In addition, one of the first chamber 20 and the second chamber 30 may be configured as a specific chamber.

[0045] The portion of the outer housing 10 that constitutes the first chamber 20 has a side wall portion 24 (see Figure 2 The side wall portion 24 extends from the first end portion F to the second end portion S of the first chamber 20, and the side wall portion 24 surrounds the first chamber 20 from the side and forms the inner peripheral surface of the first chamber 20. In addition, the same side wall portion 34 is also provided in the portion constituting the second chamber 30 in the outer shell 10.

[0046] A plurality of protrusions 25, 35 protruding from the inner circumferential surface are provided on the side wall portions 24, 34, respectively. In addition, the side wall portions 24, 34 are parts made of resin and are formed integrally with the outer housing 10. In addition, the plurality of protrusions 25, 35 are also parts made of resin and are formed integrally with the side wall portions 24, 34 and further with the outer housing 10. That is, the side wall portions 24, 34 and the plurality of protrusions 25, 35 are formed as a part of the outer housing 10 when the outer housing 10 is formed by, for example, injection molding.

[0047] Each protrusion 25 of the first chamber 20 is a rib-shaped elongated portion, and extends linearly from the first end F of the first chamber 20 along the flow direction of the fluid toward the second end S (in other words, toward the cover). However, not limited to this, each protrusion 25 can also extend toward the cover side in a zigzag or curved manner, or can extend along a direction different from the flow direction of the fluid, for example, along a direction orthogonal to the flow direction. In addition, as an example, each protrusion 25 extends from the first end F to the second end S. However, each protrusion 25 may not reach the second end S, and the end of each protrusion 25 located on the cover side may be located, for example, at the central periphery of the side wall portion 24 in the flow direction of the fluid or the periphery of the first end F. In addition, each protrusion 25 may extend from a position away from the first end F. In addition, each protrusion 25 may be a rod-shaped portion protruding from the inner circumference of the side wall portion 24.

[0048] In addition, the plurality of protrusions 25 are arranged at substantially fixed intervals from each other in a manner surrounding the side surface of the first chamber 20. Of course, the present invention is not limited thereto, and the intervals between adjacent protrusions 25 may not be substantially fixed. In addition, the plurality of protrusions 25 may also be provided at specific positions on the inner circumference of the side wall portion 24, without surrounding the side surface of the first chamber 20.

[0049] In addition, the height of each protrusion 25 increases as it approaches the first end F. In addition, the height refers to the length between the top of the protrusion 25 and the inner peripheral surface of the side wall portion 24, that is, the length of the protrusion 25 in the protruding direction. Of course, this is not limited to this, and the height of each protrusion 25 may not be substantially constant, but may increase as it approaches the second end S.

[0050] In addition, as an example, each protrusion 25 has a cross section perpendicular to its extension direction (in other words, the flow direction of the fluid) that is substantially polygonal in shape. Specifically, the cross section may be, for example, a triangle, a quadrangle, or a pentagon (see Figures 2 to 4 In addition, for example, the top of each protrusion 25 may be formed to have a rounded shape (see Figure 5 ) In addition, each protrusion 25 may have the same shape or different shapes.

[0051] The plurality of protrusions 35 in the second cavity 30 also have the same configuration as the plurality of protrusions 25 in the first cavity 20. Alternatively, one protrusion 25, 35 may be provided in the first cavity 20 and / or the second cavity 30, respectively.

[0052] In addition, the adsorbent 4 arranged in the specific chamber is composed of granules, which are granular activated carbon. The granules can have various shapes, such as roughly cylindrical or spherical. Of course, the adsorbent 4 can also be a granular adsorbent composed of a material other than activated carbon. On the other hand, the adsorbent 4 arranged in the chamber other than the specific chamber is not limited to granular, and various adsorbents can be arranged.

[0053] [2. Second embodiment]

[0054] [(1) Summary]

[0055] The canister 1 of the second embodiment is different from the first embodiment in the structure of the second chamber 50 (see Figure 6 ). That is, in the filter tank 1 of the second embodiment, the inner shell 5 is arranged inside the outer shell 10, and the second chamber 50 is formed inside the inner shell 5. Moreover, only the second chamber 50 is configured as a specific chamber. Of course, the first chamber 20 can also be configured as a specific chamber. Hereinafter, the configuration of the second chamber 50 in the filter tank 1 of the second embodiment will be described.

[0056] [(2) Accommodation section]

[0057] The outer shell 10 of the canister 1 is provided with a housing 18 adjacent to the first chamber 20 (see Figure 6). Like the second chamber 50 of the first embodiment, the accommodating portion 18 also has a cylindrical elongated shape extending from the cover side to the port side, and a accommodating space 19 for accommodating the inner shell 5 is formed inside the accommodating portion 18. In addition, the accommodating portion 18 is not limited to a cylindrical shape, and may also be a prismatic shape, for example. An air port 13 is provided at the end of the accommodating portion 18 on the port side (hereinafter referred to as the first end). In addition, the end of the accommodating portion 18 on the cover side (hereinafter referred to as the second end) is connected to the connecting channel 15.

[0058] The inner shell 5 is a cylindrical component made of resin, and a second chamber 50 is formed inside the inner shell 5. In addition, the inner shell 5 is not limited to a cylindrical shape, and may be, for example, a square cylinder. The first end of the inner shell 5 is adjacent to the air port 13, and the air port 13 is substantially provided at the end of the second chamber 50 located on the port side (hereinafter referred to as the first end F). In addition, the second end of the inner shell 5 is adjacent to the connecting channel 15, and the end of the second chamber 50 located on the cover side (hereinafter referred to as the second end S) is connected to the connecting channel 15. The inner shell 5 includes a side wall portion 51, filters 52, 53, a partition plate 54, a porous component 55, an abutment portion 56, a flange portion 57, and a plurality of protrusions 58 (described in detail below).

[0059] The side wall portion 51 is a cylindrical portion, and the second chamber 50 is formed inside the side wall portion 51. In addition, the side wall portion 51 is not limited to a cylindrical shape, and may be, for example, a square cylindrical shape. The filters 52 and 53 are respectively arranged at the first end F and the second end S of the second chamber 50, and the granular adsorbent 4 similar to the first embodiment is arranged between the filters 52 and 53. The filter 52 located at the first end F is supported from the atmospheric port 13 side by a permeable partition 54. In addition, the second end S of the second chamber 50 is connected to the connecting channel 15. Moreover, a porous component 55 through which fluid can pass is arranged between the filter 53 located on the cover side of the second chamber 50 and the connecting channel 15, and a coil spring 17 is arranged between the porous component 55 and the cover component 14. The coil spring 17 presses the porous component 55 toward the port side.

[0060] Furthermore, the contact portion 56 is provided so as to surround the opening at the first end of the inner housing 5. The contact portion 56 contacts the accommodation portion 18 at a step portion provided near the first end of the accommodation portion 18 and is supported by the step portion.

[0061] In addition, the flange portion 57 is provided so as to surround the opening at the second end of the inner housing 5, and is a flange-shaped portion protruding to the side. The end surface of the flange portion 57 abuts against the accommodating portion 18 at the second end of the accommodating portion 18. In addition, a groove portion is formed on the end surface of the flange portion 57 so as to surround the above-mentioned opening of the inner housing 5, and a sealing member (as an example, an O-ring) is arranged in the groove. The sealing member abuts against the accommodating portion 18.

[0062] [(3) Protrusion]

[0063] The second chamber 50 is configured as a specific chamber in which a plurality of protrusions 58 are provided. The plurality of protrusions 58 protrude from the inner peripheral surface of the side wall portion 51 of the inner housing 5 (see Figure 6 ) The plurality of protrusions 58 have the same configuration as the plurality of protrusions 25 and 35 in the first embodiment.

[0064] That is, the plurality of protrusions 58 are made of resin, and the plurality of protrusions 58 are formed integrally with the side wall portion 51 and further with the inner housing 5. In addition, similar to the first embodiment, the plurality of protrusions 58 are rib-shaped elongated portions, and extend from the first end F of the second chamber 50 along the flow direction of the fluid toward the second end S. As an example, each protrusion 58 extends from the first end F of the second chamber 50 to the second end S, but each protrusion 58 may also be separated from the first end F and / or the second end S.

[0065] In addition, similarly to the first embodiment, the plurality of protrusions 58 are arranged at substantially fixed intervals to surround the side surface of the second chamber 50, and the height of each protrusion 58 decreases as it approaches the second end S. However, this is not limiting, and the arrangement and height of the plurality of protrusions 58 may be set as needed. In addition, the cross-sectional shape of each protrusion 58 may also be set in the same manner as in the first embodiment.

[0066] [3. Third embodiment]

[0067] [(1) Summary]

[0068] The canister 1 of the third embodiment is different from the first embodiment in that two reduction portions 27 are provided in the first chamber 20 as a specific chamber (see Figure 7 The reduction portion 27 is disposed around the first end F of the first chamber 20 (in other words, the specific chamber), and the reduction portion 27 is configured so that the area of ​​the cross section orthogonal to the flow direction of the fluid in the first chamber 20 decreases as it approaches the port side (in other words, the first end F).

[0069] In the third embodiment, the side wall portion 24 includes a main body portion 26 and two reduced portions 27. The main body portion 26 is a portion including an end portion located on the cover side of the side wall portion 24. The two reduced portions 27 are arranged along a direction orthogonal to the flow direction of the fluid at the end portion located on the port side of the main body portion 26, more specifically, along the direction in which the first chamber 20 and the second chamber 30 are arranged.

[0070] The first end F of the first chamber 20 is composed of the ends of the two reduction portions 27 located on the port side. The inlet 11 and the outlet 12 are provided at the ends (in other words, at each first end F). A filter 21 is provided at each first end F of the first chamber 20.

[0071] The two reduced portions 27 are formed integrally with the side wall portion 24 and the outer housing 10. Each reduced portion 27 is provided with a plurality of protrusions 25. The detailed configuration of the reduced portion 27 and the configuration of the plurality of protrusions 25 are described below.

[0072] [(2) Detailed structure of the shrinking part]

[0073] The narrowing portion 27 corresponding to the inlet 1 is provided so as to extend from the first end F of the first chamber 20 where the inlet 11 is provided to the cover side (in other words, the second end S) (see Figure 7 ) On the other hand, the reduction portion 27 corresponding to the outflow port 12 is provided so as to extend from the first end portion F of the first chamber 20 where the outflow port 12 is provided to the cover side.

[0074] Each of the reduction portions 27 surrounds an area around the corresponding port in the first chamber 20. In addition, each of the reduction portions 27 is tapered. That is, each of the reduction portions 27 extends in a straight line on a cross section including a virtual axis A, which passes through the inlet 11 or the outlet 12 and extends along the flow direction of the fluid. In addition, each of the reduction portions 27 is inclined relative to the flow direction of the fluid in such a manner that it approaches the axis A as it approaches the port side.

[0075] [(3) Protrusion]

[0076] A plurality of protrusions 25 (see FIG. 2 ) protruding from the inner circumferential surface of each of the reduced portions 27 are provided. Figure 7 The plurality of protrusions 25 are made of resin, and are formed integrally with the reduced portion 27 provided with the plurality of protrusions 25, and are further formed integrally with the side wall portion 24 and the outer housing 10. In addition, the plurality of protrusions 25 may be provided in one of the two reduced portions 27.

[0077] As in the first embodiment, each protrusion 25 is a rib-shaped elongated portion, and each protrusion 25 extends from the end portion of each reduction portion 27 located on the port side (in other words, the first end portion F) along the flow direction of the fluid to the end portion located on the cover side. However, the present invention is not limited thereto, and each protrusion 25 may extend to the main body 26 over the end portion of the reduction portion 27 located on the cover side, and each protrusion 25 may not reach the end portion. In addition, each protrusion 25 may be separated from the first end portion F of the reduction portion 27. In addition, as in the first embodiment, a plurality of protrusions 25 are arranged at substantially fixed intervals from each other in a manner surrounding the side surface of each reduction portion 27.

[0078] Here, the region extending from the end face of the first end F corresponding to the inlet 11 or the outlet 12 in the first chamber 20 to the cover side along the flow direction of the fluid is referred to as the front region 20A. The front region 20A is a columnar region, and its cross section perpendicular to the extension direction has the same shape as the end face. The top of each protrusion 25 extends along the boundary of the front region 20A. Of course, it is not limited to this, and the shape of the end of each protrusion 25 can also be set as needed.

[0079] [(4) Modification 1]

[0080] The reduction portion 27 may be provided at a position slightly away from the first end F around the first end F of the first chamber 20 (see Figure 8 Specifically, the narrowing portion 27 and the straight portion 28 may be provided on the side wall portion 24 of the first chamber 20 corresponding to the inlet 11 or the outlet 12 .

[0081] The straight portion 28 is a cylindrical portion and is provided to extend substantially straight along the flow direction of the fluid. That is, the cross section of the straight portion 28 perpendicular to the flow direction of the fluid is substantially constant. In addition, the cross section has substantially the same shape as the end face of the first end F forming the first chamber 20.

[0082] The straight portion 28 is provided to extend from the first end F in the first chamber 20 where the corresponding port is provided to the cover side, and the reduced portion 27 is provided at the end of the straight portion 28 located on the cover side. Moreover, the end of the reduced portion 27 located on the cover side is connected to the main body 26. That is, the straight portion 28 and the reduced portion 27 surround the area around the corresponding port in the first chamber 20.

[0083] In addition, as an example, the reduced portion 27 has a tapered shape. In addition, as an example, both ends of the reduced portion 27 in the flow direction of the fluid may be formed with roundness.

[0084] Moreover, similarly to the third embodiment, a plurality of protrusions 25 are provided on the inner peripheral surface of the reduction portion 27. Similar to the third embodiment, each protrusion 25 extends from the end portion of each reduction portion 27 located on the port side to the end portion located on the cover side along the flow direction of the fluid, and the top of each protrusion 25 extends along the boundary of the front area 20A. Of course, the present invention is not limited to this, and the shape and arrangement position of each protrusion 25 can be set as needed.

[0085] In addition, the shape of the reduction portion 27 is not limited to a cone, and can be set as needed. Specifically, for example, the reduction portion 27 can be a stepped portion extending in a direction perpendicular to the flow direction of the fluid (see Fig. 9 ).

[0086] In addition, the number of the narrowing portions 27 and the number of the straight portions 28 provided corresponding to the inlet 11 or the outlet 12 can be set as needed. Fig. 9 As shown, the first reduction portion 27A, the second reduction portion 27B, and the first to third straight portions 28A to 28C may be provided in a stepped manner corresponding to the inlet 11 or the outlet 12. That is, the first straight portion 28A is provided to extend from the first end F in the first chamber 20 where the corresponding port is provided to the cover side, and the first reduction portion 27A is provided at the end of the first straight portion 28A located on the cover side. In addition, the second straight portion 28B is provided to extend from the end of the first reduction portion 27A located on the outer peripheral side to the cover side, and the second reduction portion 27B is provided at the end of the second straight portion 28B located on the cover side. In addition, the third straight portion 28C is provided to extend from the end of the second reduction portion 27B located on the outer peripheral side to the cover side, and the end of the third straight portion 28C located on the cover side is connected to the main body 26. That is, the first to third straight portions 28A to 28C, the first reduced portion 27A, and the second reduced portion 27B surround the area around the corresponding ports in the first chamber 20 .

[0087] In addition, similar to the third embodiment, a plurality of protrusions 25 are provided on the inner circumferences of the second straight portion 28B, the third straight portion 28C, the first reduced portion 27A, and the second reduced portion 27B. Each protrusion 25 extends from the end portion of the above-mentioned portion located on the port side to the cover end along the flow direction of the fluid, and the top of each protrusion 25 extends along the boundary of the front area 20A. Of course, the shape and position of each protrusion 25 are not limited to this and can be set as needed.

[0088] In addition, the above-mentioned reduction portion 27 and straight portion 28 may be provided corresponding to one of the inlet port 11 or the outlet port 12, or may be provided corresponding to both of these ports. In addition, the reduction portion and the plurality of protrusions may be provided in the same manner on the side wall portion 34 of the second chamber 30 corresponding to the air port 13 in the second chamber 30. In addition, the reduction portion and the plurality of protrusions may be provided in the same manner on the side wall portion 51 of the second chamber 50 formed by the inner shell 5 in the second embodiment corresponding to the air port 13.

[0089] [(5) Modification 2]

[0090] The reduction portion 27 may also be provided corresponding to the inlet 11 and the outlet 12 (see Fig.10 That is, the reduction portion 27 may be provided to extend from a first end portion F in the first chamber 20 where the inlet 11 and the outlet 12 are provided to the second end portion S. In other words, the reduction portion 27 surrounds the area around the inlet 11 and the outlet 12 in the first chamber 20.

[0091] In addition, the reduction portion 27 may be, for example, tapered. Moreover, as in the third embodiment, a plurality of protrusions 25 are provided on the inner circumferential surface of the reduction portion 27. Each protrusion 25 extends from the end portion of the reduction portion 27 located on the port side to the end portion located on the cover side along the flow direction of the fluid, and the top of each protrusion 25 extends along the boundary of the front region 20A. In addition, the front region 20A in the second modification refers to a region extending from the end face of the first end portion F in the first chamber 20 where the inlet 11 and the outlet 12 are formed to the cover side along the flow direction of the fluid. Of course, this is not limited to this, and the shape and configuration position of each protrusion 25 can be set as needed.

[0092] In the second modification, the straight portion 28 and the reduced portion 27 can be provided together, and the number of the reduced portions 27 and the number of the straight portions 28 can be set as needed, as in the first modification. In addition, the shape of the reduced portion 27 is not limited to a cone, and may be, for example, a stepped shape. In this case, a plurality of protrusions 25 may be provided on the inner circumferential surface of the reduced portion 27 in the same manner as in the third embodiment or the first modification.

[0093] [4. Effect]

[0094] (1) According to the above-mentioned embodiment, gaps are formed between each protrusion and the granular adsorbent around the inner peripheral surface of the side wall portion of the specific chamber, thereby promoting the flow of the fluid around the inner peripheral surface. In addition, each protrusion is formed as a whole with the outer shell 10 or the inner shell 5. Thereby, it is possible to suppress the increase in the number of components and the ventilation resistance of the filter tank 1, as a result of which the desorption performance of the fuel vapor adsorbed on the adsorbent can be improved. Moreover, due to the improvement in the desorption performance, a small amount of adsorbent 4 can be used to effectively accumulate fuel vapor, thereby improving the adsorption performance of the fuel vapor. In addition, by configuring the first chamber 20 with a relatively large volume as a specific chamber, the desorption performance and the adsorption performance can be more effectively improved.

[0095] (2) Each of the protrusions 25, 35, 58 extends from the first end F of the specific chamber along the flow direction of the fluid. This can further promote the flow of the fluid around the inner peripheral surface of the specific chamber, resulting in the reduction of ventilation resistance of the canister 1.

[0096] (3) In the third embodiment, in addition to the plurality of protrusions, the fluid flow is promoted by the shape of the constricted portion 27 inside the specific chamber. Therefore, the ventilation resistance of the canister 1 can be suppressed.

[0097] (4) In addition, the protrusions 25, 35, 58 are arranged so as to surround the side surfaces of the corresponding side walls 24, 34, 51. Therefore, the flow of the fluid around the inner circumference of the side walls 24, 34, 51 can be further promoted. Thus, the ventilation resistance of the canister 1 can be further suppressed.

[0098] (5) In addition, in the chamber provided with the port, the region where the fluid flows relatively well is considered to be a region that expands in a substantially fan-shaped manner along the flow direction of the fluid from the port on a cross section including the axis A. In this regard, according to the above embodiment, since the height of each protrusion 25, 35, 58 increases as it approaches the first end F of the specific chamber, the protrusion can be arranged in a region where the flow of the fluid is relatively poor. As a result, the flow of the fluid in this region can be promoted, and as a result, the ventilation resistance of the filter tank 1 can be further suppressed.

[0099] [5. Other embodiments]

[0100] (1) The number of chambers provided in the filter tank 1 is not limited to two in the above-mentioned embodiment, and can be set as needed. In addition, a chamber configured as a specific chamber can be provided as needed. In addition, the filter tank 1 can also have a chamber without a port, and such a chamber can constitute a specific chamber. In addition, for example, not limited to the second chamber, the first chamber can also be composed of an inner shell, and the first chamber can be configured as a specific chamber.

[0101] (2) In the above embodiment, the filter tank 1 can be formed by assembling a plurality of shell components. That is, the outer peripheral surface of the filter tank 1 can be formed by a plurality of shell components, and at least one chamber can be provided inside each shell component. In this case, the plurality of protrusions in a specific chamber can be formed as one body with the shell component constituting the specific chamber.

[0102] (3) 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.

[0103] [6. Technical ideas disclosed in this specification]

[0104] [Project 1]

[0105] A canister is installed in a vehicle having an engine, wherein the canister is characterized by comprising:

[0106] at least one chamber, wherein an adsorbent for adsorbing fuel vapor is disposed in the at least one chamber;

[0107] an inlet configured to allow fuel vapor to flow from a fuel tank of the vehicle into the at least one chamber;

[0108] an atmospheric port, the atmospheric port being configured to be open to the atmosphere;

[0109] an outflow port configured to allow the fuel vapor adsorbed in the adsorbent to flow out toward the engine by the atmosphere flowing in from the atmosphere port; and

[0110] a housing member, the housing member being one of the at least one chamber and forming a specific chamber in which a granular adsorbent is disposed, and

[0111] The housing component has:

[0112] a side wall portion extending from a first end portion to a second end portion of the specific chamber in a flow direction of the fluid and forming an inner peripheral surface of the specific chamber; and

[0113] At least one protrusion is a portion formed integrally with the side wall portion and is a portion protruding from the inner peripheral surface of the side wall portion.

[0114] [Project 2]

[0115] The filter tank according to item 1 is characterized in that:

[0116] or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber,

[0117] The at least one protrusion extends from the first end of the specific chamber along the flow direction.

[0118] [Item 3]

[0119] The filter tank according to item 1 or 2 is characterized in that:

[0120] The filter tank further includes an outer shell, which is a member forming an outer peripheral surface of the filter tank and a member in which the at least one chamber is provided.

[0121] The housing member is a member disposed inside the outer housing.

[0122] [Item 4]

[0123] The filter tank according to any one of items 1 to 3 is characterized in that

[0124] A plurality of protrusions are arranged on the inner peripheral surface of the side wall portion so as to surround the specific cavity.

[0125] [Item 5]

[0126] The filter tank according to any one of items 1 to 4, characterized in that

[0127] or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber,

[0128] The height of the at least one protrusion from the inner peripheral surface to the top of the protrusion increases as it approaches the first end portion.

[0129] [Item 6]

[0130] The filter tank according to any one of items 1 to 5, characterized in that

[0131] or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber,

[0132] The side wall portion has a narrowed portion located around the first end portion of the specific chamber,

[0133] The shrinking portion is configured such that an area of ​​a cross section perpendicular to the flow direction in the specific chamber decreases toward the first end.

[0134] The at least one protrusion is disposed at the reduced portion.

[0135] [7. Correspondence of terms]

[0136] The outer housing 10 in the first and third embodiments and the inner housing 5 in the second embodiment correspond to an example of the housing member.

Claims

1. A canister installed in a vehicle having an engine, wherein the canister is characterized by: at least one chamber, wherein an adsorbent for adsorbing fuel vapor is disposed in the at least one chamber; an inlet configured to allow fuel vapor to flow from a fuel tank of the vehicle into the at least one chamber; an atmospheric port, the atmospheric port being configured to be open to the atmosphere; an outflow port configured to allow the fuel vapor adsorbed in the adsorbent to flow out toward the engine by the atmosphere flowing in from the atmosphere port; and a housing member, the housing member being one of the at least one chamber and forming a specific chamber in which a granular adsorbent is disposed, and The housing component has: a side wall portion extending from a first end portion to a second end portion of the specific chamber in a flow direction of the fluid and forming an inner peripheral surface of the specific chamber, and At least one protrusion is a portion formed integrally with the side wall portion and is a portion protruding from the inner peripheral surface of the side wall portion.

2. The filter tank according to claim 1, characterized in that: or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber, The at least one protrusion extends from the first end of the specific chamber along the flow direction.

3. The filter tank according to claim 1 or 2, characterized in that: The at least one protrusion extends in a straight line.

4. The filter tank according to any one of claims 1 to 3, characterized in that: The filter tank further includes an outer shell, which is a member forming an outer peripheral surface of the filter tank and a member in which the at least one chamber is provided. The housing member is a member disposed inside the outer housing.

5. The filter tank according to any one of claims 1 to 4, characterized in that: A plurality of protrusions are arranged on the inner peripheral surface of the side wall portion so as to surround the specific cavity.

6. The filter tank according to any one of claims 1 to 5, characterized in that: or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber, The height of the at least one protrusion from the inner peripheral surface to the top of the protrusion increases as it approaches the first end portion.

7. The filter tank according to any one of claims 1 to 6, characterized in that: or the inlet and the outlet are provided at the first end of the specific chamber, or the air port is provided at the first end of the specific chamber, The side wall portion has a narrowing portion located around the first end portion of the specific chamber, The shrinking portion is configured such that an area of ​​a cross section perpendicular to the flow direction in the specific chamber decreases toward the first end. The at least one protrusion is disposed at the reduced portion.

8. The filter tank according to claim 7, characterized in that: The at least one protrusion extends at least from a first end to a second end of the narrowing portion in the flow direction.

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