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 core material and an adsorption sheet wound around the core material and having adsorbability to adsorb evaporated fuel.

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, there is known a laminated body formed by laminating a plurality of adsorption sheets, as described in Japanese Patent No. 7250145. The laminated body can also be obtained by winding adsorption sheets. Summary of the invention

[0004] When the adsorption member can be formed by winding the adsorption sheet as described above, there is a possibility that a gap will be formed between adjacent layers. If such a gap exists, the evaporated fuel may not be adsorbed by the adsorption sheet but pass through the adsorption member.

[0005] One aspect of the present disclosure is to provide a canister capable of reducing gaps between adsorption components composed of a wound adsorption sheet.

[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 core material; and an adsorption sheet, the adsorption sheet being wound on the core material, and the adsorption sheet having an adsorption property for adsorbing evaporated fuel. 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, by winding the adsorption sheet around the core material, the adhesion between adjacent layers of the adsorption sheet can be improved. Thus, the gap in the first adsorption member can be reduced, and the penetration of the evaporated fuel can be suppressed.

[0008] In one aspect of the present disclosure, the core material may have non-air permeability. According to the above configuration, it is possible to suppress the evaporated fuel from passing through the core material.

[0009] In one embodiment of the present disclosure, the evaporated fuel can flow in the first adsorption chamber along the axial direction of the core material. According to the above configuration, by making the core material exist at the center of the first adsorption member, it is possible to suppress the gas flowing in the first adsorption chamber from deviating toward the center of the first adsorption member, thereby making it possible to disperse the flow of the evaporated fuel in the entire first adsorption chamber.

[0010] In one embodiment of the present disclosure, the cross-sectional shape of the outer peripheral surface of the core material perpendicular to the axial direction of the core material is similar to the cross-sectional shape of the inner peripheral surface of the first adsorption chamber perpendicular to the axial direction of the core material. According to the above structure, the first adsorption component can be formed according to the shape of the first adsorption chamber. Therefore, the design freedom of the first adsorption chamber can be improved.

[0011] In one aspect of the present disclosure, the core material may have a holding mechanism for holding a portion of the adsorption sheet. According to the above configuration, since the adsorption sheet can be prevented from being displaced when the adsorption sheet is wound, the adhesion between adjacent layers of the adsorption sheet can be improved.

[0012] In one embodiment of the present disclosure, the adsorption sheet may be formed of fibers having an adsorption property for adsorbing evaporated fuel. The first adsorption member may further include granular bodies, which are dispersed on the surface or inside of the adsorption sheet and have an adsorption property for adsorbing evaporated fuel. According to the above configuration, by combining the adsorption capacity of the adsorption sheet with the adsorption capacity of the granular bodies, the first adsorption member can exert an adsorption effect on evaporated fuel having a wide concentration range.

[0013] 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

[0014] Figure 1 Schematic diagram of a filter tank in an embodiment.

[0015] Figure 2A yes Figure 1 A schematic three-dimensional view of the first adsorption component in the filter tank.

[0016] Figure 2B yes Figure 2A A schematic top view of the first adsorption component.

[0017] Figure 3A is with Figure 2A A schematic plan view of a first adsorption member according to a different embodiment.

[0018] Figure 3B yes Figure 3A A schematic three-dimensional diagram of the first adsorption component.

[0019] Figure 4Ayes Figure 2A , Figure 2B A schematic three-dimensional view of the core material in the first adsorption component.

[0020] Figure 4B yes Figure 2A , Figure 2B A schematic three-dimensional view of the core material in the first adsorption component.

[0021] Figure 4C is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0022] Figure 4D is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0023] Figure 5A is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0024] Figure 5B is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0025] Figure 5C is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0026] Figure 5D is with Figure 4A , Figure 4B Schematic perspective views of core materials in different embodiments.

[0027] Figure 6 yes Figure 2A , Figure 2B A schematic expanded view of the adsorption sheet in the first adsorption component.

[0028] Figure 7 is with Figure 2A , Figure 2B A schematic perspective view of a first adsorption member according to a different embodiment. DETAILED DESCRIPTION

[0029] Embodiments to which the present disclosure is applied will be described below with reference to the drawings.

[0030] [1. First embodiment]

[0031] [1-1. Structure]

[0032] 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.

[0033] 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 .

[0034] <Charging port>

[0035] 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.

[0036] <Purge port>

[0037] 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.

[0038] <Atmospheric port>

[0039] 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.

[0040] <1st adsorption chamber>

[0041] 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.

[0042] <Second adsorption chamber>

[0043] 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.

[0044] <3rd adsorption chamber>

[0045] The third adsorption chamber 5 accommodates the third adsorption member 9. The third adsorption chamber 5 is arranged between the first adsorption chamber 3 and the second adsorption chamber 4 in the flow path of the evaporated fuel.

[0046] 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.

[0047] 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.

[0048] Furthermore, by taking in the atmosphere from the atmosphere port 2C, the evaporated fuel adsorbed by the adsorption members 7 to 9 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.

[0049] <First suction member>

[0050] 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 .

[0051] <Core material>

[0052] 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).

[0053] 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 .

[0054] 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).

[0055] 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).

[0056] like Figure 4A and 4B As shown, the core material 71 has a holding mechanism 71A for holding a portion of the suction sheet 72. The holding mechanism 71A has a base 71B and a pressing portion 71C. The base 71B and the pressing portion 71C each have a holding surface 71D, and the suction sheet 72 is superimposed on the holding surface 71D.

[0057] The pressing portion 71C is configured to be movable relative to the base 71B. The pressing portion 71C can be in the release position (see Figure 4A ) and hold position (refer to Figure 4B ), wherein the release position is a position away from the base 71B, and the holding position is a position where the pressing portion 71C and the base 71B jointly clamp a portion (e.g., an end) of the adsorption sheet 72. Specifically, the pressing portion 71C is configured such that the pressing portion 71C is connected to the base 71B at a first end 711 in the axial direction of the core material 71 and can swing around the first end 711.

[0058] The contact surface between the base 71B, the pressing portion 71C and the suction sheet 72 (ie, the holding surface 71D) is provided with a concavoconvex shape 71E for preventing the suction sheet 72 from sliding. The concavoconvex shape 71E may be a convex strip extending in the axial direction of the core material 71, for example.

[0059] In addition, if Figure 4C and 4D or Figure 5A and 5B As shown, the holding mechanism 71A may have a snap-fit ​​structure 71F, which is used to fix the pressing portion 71C located at the holding position to the base 71B. Figure 5C and 5D As shown, the pressing portion 71C may be configured to press the second end portion 712 into the base 71B, wherein the second end portion 712 is located on the opposite side of the first end portion 711 connected to the base 71B.

[0060] <Adsorption sheet>

[0061] 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.

[0062] 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 .

[0063] In addition, if Figure 6 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.

[0064] 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.

[0065] The adsorption performance of the adsorption sheet 72 and the adsorption performance of the granular body 73 are different from each other. In addition, the adsorption sheet 72 may be provided with a plurality of types (i.e., granular bodies 73 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 73 and a second region not provided with the granular body 73.

[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 winding the adsorption sheet 72 around the core material 71, it is possible to improve the adhesion between adjacent layers of the adsorption sheet 72. This can reduce the gaps in the first adsorption member 7, thereby suppressing the penetration of evaporated fuel.

[0073] (1b) By making the core material 71 non-permeable, it is possible to suppress the evaporated fuel from passing through the core material 71 .

[0074] (1c) By making the evaporated fuel flow along the axial direction of the core material 71, since the core material 71 is located at the center of the first adsorption member 7, it is possible to suppress the gas flowing in the first adsorption chamber 3 from being biased toward the center of the first adsorption member 7. Therefore, the flow of the evaporated fuel can be dispersed throughout the first adsorption chamber 3.

[0075] (1d) By making the first shape S1 of the core material 71 and the second shape S2 of the first adsorption chamber 3 similar, the first adsorption member 7 can be formed in accordance with the shape of the first adsorption chamber 3. Therefore, the degree of freedom in designing the first adsorption chamber 3 can be increased.

[0076] (1e) Since the core material 71 has the holding mechanism 71A, it is possible to suppress the displacement of the adsorption sheet 72 when the adsorption sheet 72 is wound, so that the adhesion between adjacent layers of the adsorption sheet 72 can be improved.

[0077] (1f) By providing the first adsorption member with the granular bodies 73 dispersed on the adsorption sheet 72, the adsorption capabilities of the adsorption sheet 72 and the granular bodies 73 are combined, thereby enabling the first adsorption member 7 to exhibit an adsorption effect on evaporated fuel having a wide concentration range.

[0078] (1g) 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.

[0079] [2. Other embodiments]

[0080] 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.

[0081] (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 7 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).

[0082] (2b) In the filter tank of the above embodiment, the core material may not have a holding mechanism for holding the adsorption sheet. In addition, the adsorption sheet may be fixed to the core material by a fixing method such as an adhesive. In addition, after the wound body of the adsorption sheet is arranged in the adsorption chamber, the core material may be inserted into the wound body.

[0083] (2c) In the canister of the above embodiment, the first adsorption member may not have granular material. In addition, the material of the adsorption sheet may be any material having air permeability and adsorption properties, and is not limited to fiber.

[0084] (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.

[0085] (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 accommodated in the second adsorption chamber, and The first adsorption component comprises: Core material; and An adsorption sheet is wound around the core material and has an adsorption property for adsorbing the evaporated fuel.

2. The filter tank according to claim 1, characterized in that: The core material has non-air-permeability.

3. The filter tank according to claim 2, characterized in that: In the first adsorption chamber, the evaporated fuel flows along the axial direction of the core material.

4. The filter tank according to claim 1 or 2, characterized in that: A cross-sectional shape of the outer peripheral surface of the core material perpendicular to the axial direction of the core material is similar to a cross-sectional shape of the inner peripheral surface of the first adsorption chamber perpendicular to the axial direction of the core material.

5. The filter tank according to claim 1 or 2, characterized in that: The core material has a holding mechanism that holds a portion of the adsorption sheet.

6. The filter tank according to claim 1 or 2, characterized in that: The adsorption sheet is formed of fibers having an adsorption property for adsorbing the evaporated fuel. The first adsorption member further includes granular bodies which are dispersed on the surface or inside of the adsorption sheet and have an adsorption property for adsorbing the evaporated fuel.

7. 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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