Filtering tank

Abstract

One aspect of the present disclosure provides a canister for adsorbing and desorbing evaporated fuel generated in a fuel tank of a vehicle. The canister is provided with: a charge port through which evaporated fuel is introduced; a purge port through which the evaporated fuel is discharged; an atmosphere port which opens to the atmosphere; a first adsorption chamber and a second adsorption chamber which are connected to the charge port and the purge port directly or through another chamber; the first adsorption member has: a plurality of adsorption layers having adsorbability to adsorb evaporated fuel; and an adjustment layer which has air permeability and is sandwiched between the plurality of adsorption layers.

Description

Technical Field

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

[0002] A canister is installed in a fuel tank of a vehicle to prevent evaporated fuel from being released into the atmosphere. The canister adsorbs evaporated fuel in an adsorption member and is purged by desorbing fuel from the adsorbent with inhaled air, thereby supplying the evaporated fuel to the engine.

[0003] As the adsorption member of the canister, a laminated body formed by laminating adsorption sheets as described in Japanese Patent No. 7250145 is known. Summary of the invention

[0004] In the adsorption member formed by stacking adsorption sheets as described above, there is a possibility that the density between the stacked adsorption sheets increases, and the ventilation resistance increases.

[0005] One aspect of the present disclosure is to provide a filter canister capable of reducing ventilation resistance of an adsorption component having a multi-layer structure.

[0006] One scheme of the present disclosure is a canister for adsorbing and desorbing evaporated fuel generated in a fuel tank of a vehicle. The canister includes: a filling port for introducing evaporated fuel; a purge port for discharging evaporated fuel; an atmospheric port for opening to the atmosphere; a first adsorption chamber and a second adsorption chamber, the first adsorption chamber and the second adsorption chamber being connected to the filling port and the purge port directly or via other chambers; a first adsorption component, the first adsorption component being accommodated in the first adsorption chamber; and a second adsorption component, the second adsorption component being accommodated in the second adsorption chamber. The first adsorption component includes: a plurality of adsorption layers, the plurality of adsorption layers having an adsorption property for adsorbing evaporated fuel; and an adjustment layer, the adjustment layer having air permeability and being sandwiched between the plurality of adsorption layers. Specifically, one of the first adsorption chamber and the second adsorption chamber is directly connected to the filling port and the purge port, while the other adsorption chamber is connected to the filling port and the purge port via other chambers.

[0007] According to the above configuration, the ventilation resistance between the adsorption layers can be reduced by arranging the adjustment layer between the adsorption layers. Therefore, the ventilation resistance of the first adsorption member having a multi-layer structure can be reduced using a relatively simple configuration.

[0008] In one embodiment of the present disclosure, the ventilation resistance of the adjustment layer may be smaller than the ventilation resistance of the plurality of adsorption layers. According to the above configuration, the effect of reducing the ventilation resistance between the adsorption layers can be promoted.

[0009] In one aspect of the present disclosure, the first adsorption member may have a region where no adjustment layer is arranged between the plurality of adsorption layers. According to the above configuration, the air flow resistance of the first adsorption member can be easily adjusted.

[0010] In one embodiment of the present disclosure, the plurality of adsorption layers and the adjustment layer are part of a roll body composed of an adsorption sheet and an adjustment sheet stacked on the adsorption sheet. According to the above configuration, the first adsorption member having the plurality of adsorption layers and the adjustment layer can be easily formed.

[0011] In one embodiment of the present disclosure, the first adsorption component may also have a core material. The adsorption sheet and the adjustment sheet may be wound around the core material. According to the above configuration, the adhesion between adjacent layers can be improved by the core material. As a result, the gap in the first adsorption component can be reduced, thereby reducing the ventilation resistance of the first adsorption component and suppressing the passage of evaporated fuel.

[0012] In one aspect of the present disclosure, the first adsorption chamber may be directly connected to the atmospheric port. According to the above configuration, the amount of evaporated fuel leaking from the atmospheric port can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of a filter tank in an embodiment.

[0014] Figure 2A yes Figure 1 A schematic three-dimensional view of the first adsorption component in the filter tank.

[0015] Figure 2B yes Figure 2A A schematic top view of the first adsorption component.

[0016] Figure 3A is with Figure 2A , Figure 2B A schematic plan view of a first adsorption member according to a different embodiment.

[0017] Figure 3B yes Figure 3A A schematic three-dimensional diagram of the first adsorption component.

[0018] Figure 4 yes Figure 2A , Figure 2B A schematic expanded view of the suction piece and the adjustment piece in the first suction component.

[0019] Figure 5A is with Figure 4 Schematic expansion diagrams of suction sheets and adjustment sheets in different embodiments.

[0020] Figure 5B Is has Figure 5AA schematic three-dimensional diagram of the first adsorption component of the adsorption sheet and the adjustment sheet.

[0021] Fig. 6A is with Figure 4 Schematic expansion diagrams of suction sheets and adjustment sheets in different embodiments.

[0022] Figure 6B Is has Fig. 6A A schematic three-dimensional diagram of the first adsorption component of the adsorption sheet and the adjustment sheet.

[0023] Figure 7 is with Figure 2A , Figure 2B A schematic perspective view of a first adsorption member according to a different embodiment.

[0024] Fig. 8A is with Figure 2A , Figure 2B Schematic diagram of the first adsorption member in different embodiments.

[0025] Figure 8B is with Figure 2A , Figure 2B Schematic diagram of the first adsorption member in different embodiments. DETAILED DESCRIPTION

[0026] Embodiments to which the present disclosure is applied will be described below with reference to the drawings.

[0027] [1. First embodiment]

[0028] [1-1. Structure]

[0029] Figure 1 The canister 1 shown is an evaporated fuel processing device for adsorbing and desorbing evaporated fuel generated in a fuel tank of a vehicle.

[0030] The canister 1 includes a filling port 2A, a purge port 2B, an atmosphere port 2C, a first adsorption chamber 3 , a second adsorption chamber 4 , a third adsorption chamber 5 , a first adsorption member 7 , a second adsorption member 8 , and a third adsorption member 9 .

[0031] <Charging port>

[0032] The filling port 2A is connected to the fuel tank of the vehicle through a pipe. The filling port 2A is configured to introduce evaporated fuel generated in the fuel tank into the canister 1.

[0033] <Purge port>

[0034] The purge port 2B is connected to an intake pipe of a vehicle engine via a purge valve. The purge port 2B is configured to discharge evaporated fuel in the canister 1 from the canister 1 and supply the evaporated fuel to the engine.

[0035] <Atmospheric port>

[0036] The atmospheric port 2C is open to the atmosphere. The atmospheric port 2C releases the gas from which the evaporated fuel has been removed into the atmosphere. In addition, the atmospheric port 2C introduces external air (ie, purge air) to desorb (ie, purge) the evaporated fuel adsorbed in the canister 1.

[0037] <1st adsorption chamber>

[0038] The first adsorption chamber 3 accommodates the first adsorption member 7. The atmospheric port 2C is directly connected to the first adsorption chamber 3 without passing through other adsorption chambers. The first adsorption chamber 3 communicates with the atmospheric port 2C and the third adsorption chamber 5. The first adsorption chamber 3 discharges gas in which the evaporated fuel has been adsorbed from the atmospheric port 2C.

[0039] <Second adsorption chamber>

[0040] The second adsorption chamber 4 accommodates the second adsorption member 8. The charging port 2A and the purge port 2B are directly connected to the second adsorption chamber 4 without passing through other adsorption chambers. The second adsorption chamber 4 is connected to the charging port 2A, the purge port 2B, and the third adsorption chamber 5. The second adsorption chamber 4 adsorbs the evaporated fuel introduced from the charging port 2A. In addition, the second adsorption chamber 4 discharges the adsorbed evaporated fuel from the purge port 2B.

[0041] <3rd adsorption chamber>

[0042] The third adsorption chamber 5 accommodates the third adsorption member 9. The third adsorption chamber 5 is located between the first adsorption chamber 3 and the second adsorption chamber 4 in the flow path of the evaporated fuel.

[0043] The evaporated fuel introduced from the charging port 2A is adsorbed by the second adsorption member 8 in the second adsorption chamber 4. The evaporated fuel that is not completely adsorbed in the second adsorption chamber 4 moves to the third adsorption chamber 5 and is adsorbed by the third adsorption member 9 in the third adsorption chamber 5.

[0044] Furthermore, the evaporated fuel that is not completely adsorbed in the third adsorption chamber 5 moves to the first adsorption chamber 3 and is adsorbed by the first adsorption member 7 in the first adsorption chamber 3. The gas in which the evaporated fuel has been adsorbed is released from the atmosphere port 2C.

[0045] Furthermore, by taking in the atmosphere from the atmosphere port 2C, the evaporated fuel adsorbed by the adsorption members in the first adsorption chamber 3, the second adsorption chamber 4, and the third adsorption chamber 5 is discharged from the purge port 2B to the engine. Therefore, air containing the evaporated fuel is supplied to the engine.

[0046] <First suction member>

[0047] The first adsorption member 7 is accommodated in the first adsorption chamber 3. Figure 2A and2B As shown, the first adsorption member 7 includes a core material 71 , an adsorption sheet 72 , and an adjustment sheet 73 .

[0048] <Core material>

[0049] The core material 71 is a non-gas-permeable rod-shaped member. The core material 71 is made of a substantially gas-impermeable material and has a structure that substantially does not allow gas to pass therethrough (ie, has no connection holes or communication spaces).

[0050] The first adsorption member 7 is disposed so that the axial direction of the core material 71 is parallel to the flow direction G of the evaporated fuel in the first adsorption chamber 3 . That is, in the first adsorption chamber 3 , the evaporated fuel flows along the axial direction of the core material 71 .

[0051] like Figure 2B As shown, the cross-sectional shape S1 of the outer circumferential surface of the core material 71 perpendicular to the axial direction of the core material 71 (hereinafter referred to as the "first shape") and the cross-sectional shape S2 of the inner circumferential surface of the first adsorption chamber 3 perpendicular to the axial direction of the core material 71 (hereinafter referred to as the "second shape") are similar shapes. For example, if the second shape S2 of the first adsorption chamber 3 is circular (that is, the internal space of the first adsorption chamber 3 is a cylinder), the first shape S1 of the core material 71 is also circular (that is, the core material 71 is a cylinder).

[0052] In addition, for example Figure 3A As shown, if the second shape S2 of the first adsorption chamber 3 is a quadrilateral (that is, the internal space of the first adsorption chamber 3 is a quadrangular prism), the first shape S1 of the core material 71 is also a quadrilateral (that is, Figure 3B As shown, the core material 71 is a quadrangular prism).

[0053] <Adsorption sheet>

[0054] like Figure 2A and Figure 2B As shown, the adsorption sheet 72 and the adjustment sheet 73 are wound together on the core material 71. The adsorption sheet 72 has an adsorption property of adsorbing the evaporated fuel. That is, the adsorption sheet 72 adsorbs the evaporated fuel and butane supplied to the canister 1 together with the air, etc. In addition, the adsorption sheet 72 desorbs the evaporated fuel and butane by introducing the outside air.

[0055] Specifically, the adsorption sheet 72 is made of fibers having an adsorbent property for adsorbing the evaporated fuel. For example, a woven fabric, a knitted fabric, or a non-woven fabric of carbon fibers is suitable for use as the adsorption sheet 72 .

[0056] In addition, if Figure 4As shown, the granular bodies 74 are dispersed on the surface or inside of the adsorption sheet 72. The granular bodies 74 have an adsorption property for adsorbing evaporated fuel. That is, the first adsorption member 7 has the granular bodies 74 dispersed on the surface or inside of the adsorption sheet 72 and having an adsorption property for adsorbing evaporated fuel.

[0057] As the granular body 74, for example, activated carbon, zeolite, etc. can be cited. The granular body 74 enters into the gaps between the fibers constituting the adsorption sheet 72 (that is, is entangled in the fibers) and is fixed in the adsorption sheet 72. The adsorption sheet 72 is wound around the core material 71 in a state where the granular body 74 is arranged therein. The granular body 74 is arranged in the adsorption sheet 72 by, for example, spraying, coating, etc.

[0058] The adsorption performance of the adsorption sheet 72 and the adsorption performance of the granular body 74 are different from each other. In addition, the adsorption sheet 72 may be provided with a plurality of types (i.e., granular bodies 74 having different adsorption capacities and / or desorption capacities). In addition, the adsorption sheet 72 may be provided with a first region provided with the granular body 74 and a second region not provided with the granular body 74.

[0059] <Adjustment sheet>

[0060] like Figure 2A and Figure 2B As shown, the adjustment sheet 73 and the suction sheet 72 are wound together on the core material 71. The adjustment sheet 73 has air permeability.

[0061] The ventilation resistance and density of the adjustment sheet 73 are respectively smaller than those of the adsorption sheet 72. In addition, the adjustment sheet 73 may or may not have the adsorption property to adsorb the evaporated fuel. The material of the adjustment sheet 73 is, for example, polyurethane foam.

[0062] like Figure 4 As shown, the adjustment sheet 73 is wound around the core material 71 in a manner overlapping the surface of one side of the adsorption sheet 72. Figure 2B As shown, the adsorption sheet 72 and the adjustment sheet 73 are wound on the core material 71, thereby forming a plurality of cylindrical adsorption layers 72A and a plurality of cylindrical adjustment layers 73A.

[0063] That is, the first adsorption member 7 includes a plurality of adsorption layers 72A and a plurality of adjustment layers 73A, wherein the adsorption layer 72A has an adsorption property for adsorbing evaporated fuel, and the adjustment layer 73A has air permeability and is sandwiched between the plurality of adsorption layers 72A in the radial direction of the core material 71. The adsorption layer 72A and the adjustment layer 73A are part of a winding body composed of an adsorption sheet 72 and an adjustment sheet 73 stacked on the adsorption sheet 72. The ventilation resistance and density of the adjustment layer 73A are smaller than those of the adsorption layer 72A.

[0064] The outer peripheral surface of the adjustment layer 73A contacts the inner peripheral surface of the adsorption layer 72A, and the inner peripheral surface of the adjustment layer 73A contacts the outer peripheral surface of the adsorption layer 72A. That is, the adjustment layer 73A is sandwiched between the two adsorption layers 72A in the thickness direction. In addition, the outermost layer of the first adsorption member 7 is the adsorption layer 72A. That is, the adsorption layer 72 and the adjustment layer 73 are wound together in such a way that the adsorption layer 72 is located on the outside.

[0065] like Figure 5A As shown, the suction sheet 72 may have a non-overlapping area 721, where the adjustment sheet 73 is not overlapped. The non-overlapping area 721 is provided in the suction sheet 72, in an area opposite to the area where the core material 71 is overlapped when the suction sheet 72 is started to be wound (i.e., an area near the end where the winding is finished).

[0066] Through Figure 5A As shown in FIG. 1 , the adsorption sheet 72 and the adjustment sheet 73 are wound around the Figure 5B As shown, the first adsorption member 7 is provided with a non-adjustment region 7A where no adjustment layer 73A is arranged between the plurality of adsorption layers 72A. This makes it easy to adjust the air flow resistance of the first adsorption member 7.

[0067] exist Figure 5B In the example of FIG. 1 , the non-adjustment region 7A is provided near the outer peripheral surface of the first adsorption member 7 (i.e., a region away from the core material 71). In the non-adjustment region 7A, two adjacent adsorption layers 72A are directly stacked on each other. That is, the outer peripheral surface of the inner adsorption layer 72A contacts the inner peripheral surface of the outer adsorption layer 72A.

[0068] In addition, if Fig. 6A As shown, the non-overlapping region 721 may also be provided in the region of the adsorption sheet 72 where the core material 71 is overlapped when the adsorption sheet 72 begins to be rolled up (ie, the region close to the end where the rolling begins).

[0069] Through Fig. 6A As shown in FIG. 1 , the adsorption sheet 72 and the adjustment sheet 73 are wound around the Figure 6B As shown, the first adsorption member 7 can be obtained in which the non-adjustment region 7A is provided near the center of the wound body (that is, a region close to the core material 71).

[0070] <Second Suction Member and Third Suction Member>

[0071] The second adsorption member 8 and the third adsorption member 9 respectively adsorb the evaporated fuel and butane supplied to the canister 1 together with the air etc. The second adsorption member 8 and the third adsorption member 9 desorb the evaporated fuel and butane by introducing the outside air.

[0072] As materials for the second adsorption component 8 and the third adsorption component 9, for example, activated carbon, zeolite, etc. can be used. As activated carbon, for example, a polymer of granular adsorbents, shaped activated carbon formed into a honeycomb shape, etc., fibrous activated carbon formed into a sheet, a rectangular parallelepiped shape, a cylindrical shape, or a prism shape, etc. can be used. The second adsorption component 8 and the third adsorption component 9 can be the same type of adsorbent or different types of adsorbents. In addition, similar to the first adsorption component 7, the second adsorption component 8 and the third adsorption component 9 can also have a core material and an adsorption sheet wound on the core material.

[0073] [1-2. Effect]

[0074] According to the embodiments described in detail above, the following effects can be achieved.

[0075] (1a) By disposing the adjustment layer 73A between the adsorption layers 72A, the air flow resistance between the adsorption layers 72A can be reduced. Therefore, the air flow resistance of the first adsorption member 7 having a multi-layer structure can be reduced using a relatively simple configuration.

[0076] (1b) By making the ventilation resistance of the adjustment layer 73A smaller than the ventilation resistance of the adsorption layer 72A, the effect of reducing the ventilation resistance between the adsorption layers 72A can be promoted.

[0077] (1c) Since the adsorption layer 72A and the adjustment layer 73A are part of the wound body composed of the adsorption sheet 72 and the adjustment sheet 73, it is easy to form the first adsorption member 7 including the plurality of adsorption layers 72A and the adjustment layer 73A.

[0078] (1d) By winding the adsorption sheet 72 and the adjustment sheet 73 around the core material 71, the adhesion between adjacent layers can be improved by the core material 71. Thus, the gap in the first adsorption member 7 can be reduced, thereby reducing the ventilation resistance of the first adsorption member 7 and suppressing the penetration of evaporated fuel.

[0079] (1e) By accommodating the first adsorption member 7 in the first adsorption chamber 3 connected to the atmosphere port 2C, the amount of evaporated fuel leaking from the atmosphere port 2C can be reduced.

[0080] [2. Other embodiments]

[0081] As mentioned above, although embodiment of this disclosure is described, this disclosure is not limited to the said embodiment, It can be implemented in various forms.

[0082] (2a) In the canister of the above embodiment, the evaporated fuel may not flow along the axial direction of the core material in the first adsorption chamber. Figure 7As shown, the first adsorption member 7 may be arranged so that the axial direction of the core material 71 intersects with the flow direction G of the evaporated fuel in the first adsorption chamber. In this case, the core material 71 may be hollow (ie, cylindrical).

[0083] (2b) In the filter tank of the above embodiment, the first adsorption component may not have a core material. In addition, the adsorption sheet and the adjustment sheet may not be wound together. For example Fig. 8A As shown, the adsorption sheet 72 can be folded to form a plurality of adsorption layers 72A. Fig. 8A In the example of , a plurality of adjustment sheets 73 are arranged between the folded adsorption sheets 72. Figure 8B As shown, a plurality of adsorption sheets 72 and adjustment sheets 73 may be stacked to form a plurality of adsorption layers 72A and adjustment layers 73A.

[0084] (2c) In the canister of the above embodiment, the first adsorption member may not have granular material. Furthermore, the material of the adsorption sheet (ie, adsorption layer) may be any material having air permeability and adsorption properties, and is not limited to fibers.

[0085] (2d) In the canister of the above embodiment, the first adsorption member may not be housed in the adsorption chamber connected to the atmosphere port. For example, the first adsorption member may be housed in the adsorption chamber connected to the charging port and the purge port.

[0086] (2e) The functions of one component in the above-mentioned embodiment may be dispersed among a plurality of components, or the functions of a plurality of components may be integrated into one component. In addition, a part of the components of the above-mentioned embodiment may be omitted. At least a part of the components of the above-mentioned embodiment may be added to the components of the above-mentioned other embodiments, or at least a part of the components of the above-mentioned embodiment may be replaced with the components of the above-mentioned other embodiments. In addition, all the modes included in the technical ideas determined by the statements recorded in the present disclosure are embodiments of the present disclosure.

Claims

1. A canister for adsorbing and desorbing evaporated fuel generated in a fuel tank of a vehicle, the canister comprising: a filling port, the filling port introducing the evaporated fuel; a purge port, the purge port discharging the evaporated fuel; An atmospheric port, the atmospheric port being open to the atmosphere; a first adsorption chamber and a second adsorption chamber, wherein the first adsorption chamber and the second adsorption chamber are connected to the filling port and the purge port directly or via other chambers; a first adsorption member housed in the first adsorption chamber; and a second adsorption member, the second adsorption member being housed in the second adsorption chamber, and The first adsorption component comprises: a plurality of adsorption layers, the plurality of adsorption layers having an adsorption property for adsorbing the evaporated fuel; and The adjustment layer has air permeability and is sandwiched between the plurality of adsorption layers.

2. The filter tank according to claim 1, characterized in that: The ventilation resistance of the adjustment layer is smaller than the ventilation resistance of the plurality of adsorption layers.

3. The filter tank according to claim 1 or 2, characterized in that: The first adsorption member has a region where the adjustment layer is not arranged between the plurality of adsorption layers.

4. The filter tank according to claim 1 or 2, characterized in that: The plurality of adsorption layers and the adjustment layer are part of a rolled body consisting of an adsorption sheet and an adjustment sheet stacked on the adsorption sheet.

5. The filter tank according to claim 4, characterized in that: The first adsorption component further comprises a core material. The adsorption sheet and the adjustment sheet are wound around the core material.

6. The filter tank according to claim 1 or 2, characterized in that: The first adsorption chamber is directly connected to the atmospheric port.

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