Filtering tank

Abstract

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 charging port, a purge port, an atmosphere port, a first adsorption chamber and a second adsorption chamber connected to the charging port and the purge port directly or via another chamber, a first adsorption member housed in the first adsorption chamber, and a second adsorption member housed in the second adsorption chamber. The first adsorption member has: an adsorption sheet formed of fibers having adsorbability to adsorb evaporated fuel; and particles that are dispersed on the surface or inside of the adsorbent sheet and have adsorbability to adsorb evaporated fuel. The adsorption sheet is wound or folded so as to form a plurality of 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 the fuel is desorbed from the adsorption member by inhaled air for purging, thereby supplying the evaporated fuel to the engine.

[0003] As the adsorption member of the canister, a laminated body formed by laminating a plurality of 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, the pore size of the adsorption sheets is fixed, so the adsorption and desorption performance of evaporated fuel is effective only for evaporated fuel with a certain concentration. Therefore, when the concentration of evaporated fuel varies greatly, sufficient adsorption may not be performed.

[0005] One aspect of the present disclosure is to provide a canister capable of exerting an adsorption effect on evaporated fuel having a wide concentration range.

[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: an adsorption sheet, the adsorption sheet being formed of fibers having an adsorption property for adsorbing evaporated fuel; and granular bodies, the granular bodies being dispersed and arranged on the surface or inside of the adsorption sheet and having an adsorption property for adsorbing evaporated fuel, the adsorption sheet being wound or folded in a manner of forming a plurality of layers. Specifically, one of the first adsorption chamber and the second adsorption chamber is directly connected to the filling port and the purge port, and the other adsorption chamber is connected to the filling port and the purge port via other chambers.

[0007] According to the above configuration, by combining the adsorption capacity of the adsorption sheet and the adsorption capacity of the granular body, the first adsorption component can exhibit an adsorption effect on the evaporated fuel having a wide concentration range. That is, the adsorption performance of the first adsorption component can be adjusted by selecting the granular body. In addition, the first adsorption component can be formed by winding or folding the adsorption sheet in a state where the granular body is wound in the adsorption sheet, so there is no need to use an adhesive to fix the granular body and to bond the layers together.

[0008] In one embodiment of the present disclosure, the first adsorption component may have first and second granules that are different from each other as granules. The adsorption sheet may have a first region in which the first granules are arranged and a second region in which the second granules are arranged. According to the above configuration, the range of evaporated fuels in which the first adsorption component exerts an adsorption effect can be expanded. For example, the adsorption effect can be achieved for evaporated fuels having a wider concentration range.

[0009] In one aspect of the present disclosure, the adsorption sheet may include a third region where the granular bodies are arranged and a fourth region where the granular bodies are not arranged. According to the above configuration, the range of the evaporated fuel over which the first adsorption member exerts an adsorption effect can also be expanded.

[0010] In one aspect of the present disclosure, the adsorption sheet may be wound so as to constitute a plurality of layers. According to the above configuration, it is easy to form the first adsorption member having a plurality of layers.

[0011] In one embodiment of the present disclosure, the first adsorption component may further include a core material. The adsorption sheet may be wound around the core material. According to the above configuration, the core material can improve the adhesion between adjacent layers. Thus, the gap in the first adsorption component can be reduced, thereby suppressing the penetration 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 2BA 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 adsorption sheet in the first adsorption component.

[0019] Figure 5A is with Figure 4 Schematic expansion diagram of the adsorption sheet in different embodiments.

[0020] Figure 5B Is has Figure 5A A schematic three-dimensional view of the first adsorption component of the adsorption sheet.

[0021] Fig. 6A is with Figure 4 Schematic expansion diagram of the adsorption sheet in different embodiments.

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

[0023] Fig. 7A is with Figure 4 Schematic expansion diagram of the adsorption sheet in different embodiments.

[0024] Figure 7B Is has Fig. 7A A schematic three-dimensional view of the first adsorption component of the adsorption sheet.

[0025] Figure 8 is with Figure 2A , Figure 2B A schematic perspective view of a first adsorption member according to a different embodiment.

[0026] Fig. 9 is with Figure 2A , Figure 2B Schematic diagram of the first adsorption member in different embodiments. DETAILED DESCRIPTION

[0027] Embodiments to which the present disclosure is applied will be described below with reference to the drawings.

[0028] [1. First embodiment]

[0029] [1-1. Structure]

[0030] Figure 1The canister 1 shown is an evaporated fuel processing device for adsorbing and desorbing evaporated fuel generated in a fuel tank of a vehicle.

[0031] 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 .

[0032] <Charging port>

[0033] 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.

[0034] <Purge port>

[0035] 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.

[0036] <Atmospheric port>

[0037] 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.

[0038] <1st adsorption chamber>

[0039] 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.

[0040] <Second adsorption chamber>

[0041] 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.

[0042] <3rd adsorption chamber>

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] <First suction member>

[0048] The first adsorption member 7 is accommodated in the first adsorption chamber 3. Figure 2A and 2B As shown, the first adsorption member 7 includes a core material 71 and an adsorption sheet 72 .

[0049] <Core material>

[0050] 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).

[0051] 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 .

[0052] 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).

[0053] 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).

[0054] <Adsorption sheet>

[0055] like Figure 2A and Figure 2B As shown, the adsorption sheet 72 is wound around 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.

[0056] 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 nonwoven fabric of carbon fibers is suitable for use as the adsorption sheet 72 .

[0057] In addition, if Figure 4 As shown, the granular bodies 73 are dispersed on the surface or inside of the adsorption sheet 72. The granular bodies 73 have an adsorption property for adsorbing the evaporated fuel. That is, the first adsorption member 7 has the granular bodies 73 dispersed on the surface or inside of the adsorption sheet 72 and having an adsorption property for adsorbing the evaporated fuel.

[0058] As the granular body 73, for example, activated carbon, zeolite, etc. can be cited. The granular body 73 is fixed in the adsorption sheet 72 by entering the gaps between the fibers constituting the adsorption sheet 72 (that is, being entangled in the fibers). The adsorption sheet 72 is wound around the core material 71 in a state where the granular body 73 is arranged therein. The granular body 73 is arranged in the adsorption sheet 72 by, for example, spraying, coating, etc.

[0059] The adsorption performance of the adsorption sheet 72 and the adsorption performance of the granular body 73 are different from each other. Figure 5A As shown, the adsorption sheet 72 may be provided with a first granular body 73A and a second granular body 73B that are different from each other as the granular body 73. In this case, the adsorption sheet 72 has a first region 721 provided with the first granular body 73A and a second region 722 provided with the second granular body 73B. As a result, the range of evaporated fuels in which the first adsorbent 7 exerts an adsorption effect can be expanded. Here, the "range of evaporated fuels" means that it may include concentration differences, type (component) differences, etc. In addition, "different from each other" means that the adsorption capacity and / or desorption capacity are different from each other.

[0060] exist Figure 5A In the example of , the first region 721 and the second region 722 are divided in the direction along the winding axis of the adsorption sheet 72 (ie, the axial direction of the core material 71). Figure 5B As shown, the first region 721 is located downstream of the second region 722 in the direction F in which the gas flows toward the atmospheric port 2C in the first adsorption chamber 3 .

[0061] As a combination of the first granular body 73A and the second granular body 73B, a combination in which the first granular body 73A has a higher desorption capacity for desorbing the evaporated fuel than the second granular body 73B and the second granular body 73B has a higher adsorption capacity than the first granular body 73A can be exemplified. Conversely, a combination in which the first granular body 73A has a higher adsorption capacity than the second granular body 73B can be adopted.

[0062] In addition, if Fig. 6A As shown, the adsorption sheet 72 may be provided with a third region 723 where the granular bodies 73 are arranged and a fourth region 724 where the granular bodies 73 are not arranged. This can expand the range of the evaporated fuel over which the first adsorption member 7 exhibits an adsorption effect.

[0063] exist Fig. 6A In the example of FIG. 7 , the third region 723 and the fourth region 724 are divided in the direction along the winding axis of the adsorption sheet 72 (ie, the axial direction of the core material 71 ). Figure 6B As shown, the third region 723 is located downstream of the fourth region 724 in the direction F.

[0064] In addition, if Fig. 7A and 7B As shown, the third region 723 may be located upstream of the fourth region 724 in the direction F.

[0065] In addition, a plurality of types of granular bodies 73 may be arranged in the third region 723. That is, the first region 721 and the second region 722 in which different types of granular bodies 73 are arranged may be provided in the third region 723, respectively.

[0066] The adsorption sheet 72 is wound on the core material 71 in a manner of forming a plurality of cylindrical layers. That is, the adsorption sheet 72 in the wound state has a plurality of layers stacked in the radial direction. The outer peripheral surface of the inner layer formed by the adsorption sheet 72 is in contact with the inner peripheral surface of the outer layer. Therefore, there is substantially no path for air to pass through along the axial direction of the core material 71 inside the adsorption sheet 72 in the wound state.

[0067] <Second Suction Member and Third Suction Member>

[0068] 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.

[0069] 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.

[0070] [1-2. Effect]

[0071] According to the embodiments described in detail above, the following effects can be achieved.

[0072] (1a) By combining the adsorption capacity of the adsorption sheet 72 and the adsorption capacity of the granular body 73, the first adsorption member 7 can exhibit an adsorption effect on the evaporated fuel having a wide concentration range. In other words, the adsorption performance of the first adsorption member 7 can be adjusted by selecting the granular body 73. In addition, the first adsorption member 7 can be formed by winding the adsorption sheet 72 in a state where the granular body 73 is wound around the adsorption sheet 72, so there is no need to use an adhesive to fix the granular body 73 and to bond the layers together.

[0073] (1b) By winding the adsorption sheet 72, it is easy to form the first adsorption member 7 having a plurality of layers.

[0074] (1c) By winding the adsorption sheet 72 around the core material 71, the adhesion between adjacent layers can be improved through the core material 71. This can reduce the gap in the first adsorption member 7, thereby suppressing the penetration of evaporated fuel.

[0075] (1d) 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.

[0076] [2. Other embodiments]

[0077] 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.

[0078] (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 8 As 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).

[0079] (2b) In the filter tank of the above embodiment, the first adsorption component may not have a core material. In addition, the adsorption sheet may not be wound together. For example Fig. 9 As shown, the adsorption sheet 72 may be folded to form a plurality of layers.

[0080] (2c) 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.

[0081] (2d) 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 accommodated in the second adsorption chamber, and The first adsorption component comprises: an adsorption sheet formed of fibers having an adsorption property for adsorbing the evaporated fuel; and a granular body, wherein the granular body is dispersed on the surface or inside of the adsorption sheet and has an adsorption property for adsorbing the evaporated fuel, The adsorption sheet is rolled or folded in a manner to constitute a plurality of layers.

2. The filter tank according to claim 1, characterized in that: The first adsorption member includes first and second granular bodies that are different from each other as the granular bodies. The adsorption sheet has a first region where the first granular body is arranged and a second region where the second granular body is arranged.

3. The filter tank according to claim 1 or 2, characterized in that: The adsorption sheet includes a third region where the granular bodies are arranged and a fourth region where the granular bodies are not arranged.

4. The filter tank according to claim 1 or 2, characterized in that: The adsorption sheet is wound to form a plurality of layers.

5. The filter tank according to claim 4, characterized in that: The first adsorption component further comprises a core material. The adsorption sheet is 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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