Spiral HC catching device and carbon tank assembly

Abstract

The invention discloses a spiral HC capturing device and a carbon canister assembly. The spiral HC capturing device comprises at least one spiral HC capturing unit, and each spiral HC capturing unit comprises a base, an activated carbon spiral cylinder and an elastic piece end cover; the base comprises a base base table, an HC airflow buffering cavity is formed in the lower portion of the base base table, and a vent hole is formed in the middle of the HC airflow buffering cavity. The activated carbon spiral cylinder is of a cylindrical structure formed by spirally surrounding an activated carbon base material, and a spiral carbon cavity is formed in the activated carbon spiral cylinder; when HC airflow flows into the activated carbon spiral cylinder from the HC airflow buffer cavity, the HC airflow enters the innermost ring of the activated carbon spiral cylinder through the vent holes and spirally flows from the inner ring to the outer ring along a spiral carbon cavity of the activated carbon spiral cylinder; one end of the activated carbon spiral cylinder is installed on the base platform and communicated with the vent hole, and the other end of the activated carbon spiral cylinder is connected with the inner end face of the elastic piece end cover. The spiral HC capturing device is combined with the carbon canister, and the purpose of low emission of the carbon canister is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of carbon canisters, and in particular relates to a spiral HC capture device and a carbon canister assembly. Background Art

[0002] Gasoline is a highly volatile liquid fuel. When the car is refueled or encounters ambient temperature fluctuations, its molecules will vaporize, causing a large amount of oil and gas to escape into the air, which constitutes an environmental pollution source that cannot be ignored. In order to further reduce the HC emissions of activated carbon canisters, the use of honeycomb activated carbon rods (Honeycombs) with low permeability characteristics has become the main choice.

[0003] Honeycomb activated carbon rod is an HC (hydrocarbon) adsorption material sintered from activated carbon powder and ceramic material. The overall shape is cylindrical, with a thick outer edge and multiple thin walls inside that intersect to form multiple square grids. After being assembled in the carbon canister, the honeycomb activated carbon rod can achieve the best effect when it is horizontal to the ground. When the gas containing HC (hydrocarbon) molecules passes through the carbon canister, these molecules are effectively adsorbed by the activated carbon layer due to the wall adhesion effect. During the desorption process, a small amount of clean air can effectively release the previously adsorbed HC molecules, thereby achieving lower emission performance. If the honeycomb activated carbon rod and the ground are not in a horizontal state, especially when it is vertical to the ground, the activated carbon will release heat in the adsorption state. Especially when the vehicle is refueling, the heat inside the carbon canister forms a large temperature difference relative to the outside world, and the internal grid of the honeycomb activated carbon rod (each grid is like a small chimney) forms a "chimney effect", which accelerates the diffusion rate of HC in the carbon canister, resulting in a decrease in the adsorption performance of the activated carbon.

[0004] Therefore, it is necessary to design a spiral HC capture device and a carbon canister assembly to improve the adsorption performance of activated carbon and achieve the purpose of low emission of the carbon canister. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the above-mentioned background technology and to provide a spiral HC capture device and a carbon canister assembly. The present invention can solve the problems of limited arrangement orientation, heavy weight and high cost of honeycomb activated carbon rods, and combine the spiral HC capture device with the carbon canister to achieve the purpose of low emission of the carbon canister.

[0006] To achieve the above object, the present invention provides a spiral HC capture device, comprising at least one spiral HC capture unit, wherein the spiral HC capture unit comprises a base, an activated carbon spiral cylinder and a spring end cover;

[0007] The base comprises a base platform, a HC airflow buffer cavity is arranged below the base platform, and a vent hole penetrating the base platform is arranged in the middle of the HC airflow buffer cavity;

[0008] The activated carbon spiral cylinder is a cylindrical structure made of an activated carbon substrate spirally wound, and a spiral carbon cavity is formed inside the activated carbon spiral cylinder; when HC airflow flows from the HC airflow buffer cavity into the activated carbon spiral cylinder, the HC airflow enters the innermost circle of the activated carbon spiral cylinder through the vent hole, and flows spirally from the inner circle to the outer circle along the spiral carbon cavity of the activated carbon spiral cylinder;

[0009] One end of the activated carbon spiral cylinder is installed on the base and communicated with the vent hole, and the other end of the activated carbon spiral cylinder is connected to the inner end surface of the spring end cover.

[0010] As a preferred embodiment, a support rib group is provided in the HC airflow buffer cavity, and the support rib group is arranged at intervals in the circumferential direction around the vent hole.

[0011] As a preferred embodiment, the support rib group includes a plurality of first support ribs and second support ribs arranged alternately, the first support ribs are fixedly connected to the inner wall of the HC airflow buffer cavity, and a gap is left between the second support ribs and the inner wall of the HC airflow buffer cavity.

[0012] As a preferred embodiment, the base further includes a base flange, an outer ring of the base flange is provided with an annular groove, and a sealing ring is installed in the annular groove.

[0013] As a preferred embodiment, the activated carbon spiral cylinder is an activated carbon substrate arranged in an Archimedean curve; the innermost circle diameter of the activated carbon spiral cylinder is larger than the diameter of the vent hole; the outer edge of the vent hole is equidistant from the innermost circle of the activated carbon spiral cylinder.

[0014] As a preferred embodiment, the thickness of the activated carbon substrate used in the activated carbon spiral cylinder is less than 3mm, and the distance between the activated carbon substrates of two adjacent turns of the activated carbon spiral cylinder is less than 3mm; the activated carbon substrate is made by firing ceramic clay and activated carbon, or the activated carbon substrate is a solid substrate coated with an activated carbon layer, and the solid substrate is selected from glass, ceramics, plastic, metal or paper.

[0015] As a preferred embodiment, the spring sheet end cover comprises an end cover body, and a plurality of spring sheets are arranged on the outer end surface of the end cover body;

[0016] The end cover body is provided with a notch for ventilation; the spring sheet comprises an oblique spring sheet and a horizontal spring sheet, one end of the oblique spring sheet is connected to the outer end surface of the end cover body, and the other end of the oblique spring sheet extends obliquely outward and is fixedly connected to the horizontal spring sheet.

[0017] As a preferred implementation, the thickness of the spring piece is less than 3 mm, the angle between the oblique spring piece and the end cover body is less than 90°, and the outer diameter of the spring piece is smaller than the outer diameter of the end cover body.

[0018] As a preferred embodiment, when the number of the spiral HC capture units is two or more, the base or the elastic end cover of one spiral HC capture unit abuts against the base or the elastic end cover of another adjacent spiral HC capture unit.

[0019] The present invention also provides a carbon canister assembly, comprising a main adsorption chamber, a secondary adsorption chamber and a HC capture chamber, wherein the main adsorption chamber is provided with an adsorption pipe opening communicating with the fuel tank and a desorption pipe opening communicating with the engine, the HC capture chamber is arranged above the secondary adsorption chamber and communicates with the secondary adsorption chamber, the HC capture chamber is provided with an atmospheric pipe opening, the HC capture chamber is provided with a spiral HC capture device as described above, the base of the spiral HC capture device is sealed with the inner wall of the HC capture chamber, and a gap is left between the spring end cover and the inner wall of the HC capture chamber.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] Firstly, a spiral carbon cavity is formed inside the activated carbon spiral cylinder of the spiral HC capture device of the present invention, and the airflow flows along the spiral path, which prolongs the contact time between the airflow and the activated carbon, improves the HC capture efficiency, and effectively captures the small molecule HC migrating from the fuel tank and the auxiliary adsorption cavity to avoid its direct discharge into the atmosphere.

[0022] Secondly, the activated carbon spiral cylinder of the present invention is made of an activated carbon substrate wrapped around a spiral and arranged in an Archimedean curve. The spacing and thickness of the activated carbon substrate are optimized and designed, and the outer edge of the vent is at an equal distance from the innermost circle of the activated carbon spiral cylinder, so as to obtain the maximum ventilation area as much as possible and ensure that the overall pressure drop does not increase.

[0023] Thirdly, an HC airflow buffer cavity is provided on the base of the present invention, and a supporting rib plate group is designed in the HC airflow buffer cavity to play a role in rectification and convergence, avoid airflow turbulence, and improve the stability of airflow; the spiral cavity and supporting structure design avoid the generation of airflow dead zones and ensure the full effectiveness of the filtering material.

[0024] Fourthly, the present invention realizes flexible assembly through the spring sheet structure and provides ventilation gaps to ensure easy operation and reliable performance.

[0025] Fifthly, the base of the present invention is designed with a sealing ring to ensure the sealing between the device and the carbon canister cavity and effectively prevent leakage.

[0026] Sixthly, the multiple spiral HC capture units of the present invention can be flexibly connected in series according to needs to adapt to different carbon canister capacities and desorption volumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the explosion of a spiral HC capture device;

[0028] Figure 2 It is a schematic diagram of the main structure of a spiral HC capture device;

[0029] Figure 3 for Figure 2 Schematic diagram of the cross-sectional structure along the AA direction;

[0030] Figure 4 is a schematic diagram of the three-dimensional structure of the base;

[0031] Figure 5 It is a schematic diagram of the main structure of the base;

[0032] Figure 6 for Figure 5 A schematic diagram of the cross-sectional structure along the BB direction;

[0033] Figure 7 is a schematic diagram of the rear view structure of the base;

[0034] Figure 8 It is a schematic diagram of the assembly structure of the activated carbon spiral cylinder and the base;

[0035] Fig. 9 It is a schematic diagram of the top view of the structure after the activated carbon spiral cylinder and the base are assembled;

[0036] Fig.10 It is a schematic diagram of the three-dimensional structure of the shrapnel end cover;

[0037] Fig.11 It is a schematic diagram of the main structure of the shrapnel end cover;

[0038] Fig.12 It is a schematic diagram of the top view of the structure of the shrapnel end cover;

[0039] Fig.13 It is a schematic diagram of the first assembly method of the spiral HC capture unit;

[0040] Fig.14 It is a schematic diagram of the second assembly method of the spiral HC capture unit;

[0041] Fig.15 It is a schematic diagram of the third assembly method of the spiral HC capture unit;

[0042] Fig.16 A schematic diagram of a carbon canister assembly of the present invention;

[0043] In the figure, the main adsorption chamber 100, the adsorption pipe port 101, the desorption pipe port 102, the auxiliary adsorption chamber 200, the HC capture chamber 300, the air vent pipe port 301, the spiral HC capture unit 400, the base 410, the base base 411, the HC airflow buffer chamber 412, the vent 413, the support rib plate group 414, the first support rib plate 4141, the second support rib plate 4142, the base flange 415, the annular groove 416, the sealing ring 417, the activated carbon spiral cylinder 420, the innermost circle 420a, the spiral carbon chamber 421, the spring end cover 430, the end cover body 431, the end cover outer diameter 431a, the spring 432, the oblique spring 4321, the horizontal spring 4322, the spring outer diameter 432a, and the notch 433. DETAILED DESCRIPTION

[0044] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention, and is only used as an example. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. At the same time, the advantages of the present invention will become clearer and easier to understand by explaining.

[0045] like Figure 1-3 As shown, a spiral HC capture device of the present invention includes at least one spiral HC capture unit 400, and the spiral HC capture unit 400 includes a base 410, an activated carbon spiral cylinder 420, and a spring end cap 430. The base 410 can be combined with the activated carbon spiral cylinder 420 into a whole by bonding, welding, or injection molding. The inner end surface of the spring end cap 430 can be fixedly connected to the activated carbon spiral cylinder 420 by infrared welding, hot plate welding, or bonding. The base 410 includes a base platform 411, and an HC airflow buffer chamber 412 is arranged below the base platform 411. A vent hole 413 penetrating the base platform 411 is arranged in the middle of the HC airflow buffer chamber 412. The HC airflow buffer chamber 412 can realize airflow rectification and convergence in various directions, and flow into the spiral carbon chamber through the vent hole 413; the activated carbon spiral cylinder 420 is a cylindrical structure made of a spirally wound activated carbon substrate, and a spiral carbon chamber 421 is formed inside the activated carbon spiral cylinder 420; when HC airflow flows from the HC airflow buffer chamber 412 to the activated carbon spiral cylinder 420, the HC airflow enters the innermost circle 420a of the activated carbon spiral cylinder 420 through the vent hole 413, and spirally flows from the inner circle to the outer circle along the spiral carbon chamber 421 of the activated carbon spiral cylinder 420; one end of the activated carbon spiral cylinder 420 is installed on the base platform 411 and connected to the vent hole 413, and the other end of the activated carbon spiral cylinder 420 is connected to the inner end surface of the spring end cover 430.

[0046] like Figure 4-7 As shown, a support rib plate group 414 is provided in the HC airflow buffer cavity 412, and the support rib plate group 414 is arranged circumferentially around the vent hole 413. The support rib plate group 414 includes a plurality of first support rib plates 4141 and second support rib plates 4142 arranged alternately, the first support rib plates 4141 are fixedly connected to the inner wall of the HC airflow buffer cavity 412, and a gap is left between the second support rib plates 4142 and the inner wall of the HC airflow buffer cavity 412. In this way, a plurality of broken rib plates or columns are designed to play a role in supporting the filter material.

[0047] The base 410 further includes a base flange 415, which can be connected to the inner wall of the HC capture cavity by bonding and welding to form a sealed state. As a preferred design, the outer ring of the base flange 415 is provided with an annular groove 416, and an O-shaped sealing ring 417 is installed in the annular groove 416, so that it can be flexibly assembled under the premise of ensuring sealing.

[0048] like Figure 8-9 As shown, the activated carbon spiral cylinder 420 is an activated carbon substrate arranged in an Archimedean curve; the innermost circle diameter of the activated carbon spiral cylinder 420 is larger than the diameter of the vent 413; the outer edge of the vent 413 is equidistant from the innermost circle of the activated carbon spiral cylinder 420. The height of the activated carbon spiral cylinder 420 needs to be set according to the height of the HC capture chamber 300, and can usually be set to standard heights such as 30mm, 50mm and 100mm. The thickness of the activated carbon substrate used in the activated carbon spiral cylinder 420 is less than 3mm, and the preferred thickness is set to 0.5mm; the distance between the activated carbon substrates of two adjacent circles of the activated carbon spiral cylinder 420 is less than 3mm, and the preferred distance is set to 1mm; the activated carbon substrate is made of ceramic clay and activated carbon, or the activated carbon substrate is a solid substrate coated with an activated carbon layer, and the solid substrate is selected from glass, ceramic, plastic, metal or paper. As a preference, the activated carbon layer can be coated on a paper material, which will be less expensive.

[0049] like Figure 10-12As shown, the spring end cover 430 includes a cover body 431, and a plurality of springs 432 are arranged on the outer end surface of the cover body 431. The cover body 431 and the springs 432 are integrally injection molded; a notch 433 for ventilation is arranged on the cover body 431; the springs 432 include an oblique spring 4321 and a horizontal spring 4322, one end of the oblique spring 4321 is connected to the outer end surface of the cover body 431, and the other end of the oblique spring 4321 extends obliquely outward and is fixedly connected to the horizontal spring 4322. The thickness of the spring 432 is less than 3mm, and the angle between the oblique spring 4321 and the cover body 431 is less than 90°, which is preferably set to 20° to 30°. The outer diameter 432a of the spring 432 is smaller than the outer diameter 431a of the cover body 431. In order to ensure that it has a certain degree of elasticity, the single-piece structure is a sheet-like structure, and the number should be ≥ 2 pieces; the end cover body 431 is an overall cylindrical structure, and a notch 433 for ventilation is designed on the outer edge of the end cover body 431. The spiral HC capture device can be used by a single spiral HC capture unit 400, or multiple spiral HC capture units 400 can be used in series, and the series connection method is flexible. When the number of spiral HC capture units 400 is two or more, the base 410 or the spring end cover 430 of one of the spiral HC capture units 400 abuts against the base 410 or the spring end cover 430 of another adjacent spiral HC capture unit 400. Fig.13 As shown, the base 410 of one spiral HC capture unit 400 abuts against the spring end cover 430 of another adjacent spiral HC capture unit 400. Fig.14 As shown, the spring sheet end cover 430 of one spiral HC capture unit 400 abuts against the spring sheet end cover 430 of another adjacent spiral HC capture unit 400. Fig.15 As shown, the base 410 of one spiral HC capturing unit 400 abuts against the base 410 of another adjacent spiral HC capturing unit 400 .

[0050] like Fig.16 A carbon canister assembly is shown, comprising a main adsorption chamber 100, a secondary adsorption chamber 200 and a HC capture chamber 300. The main adsorption chamber 100 is provided with an adsorption pipe opening 101 communicating with the fuel tank and a desorption pipe opening 102 communicating with the engine. The HC capture chamber 300 is arranged above the secondary adsorption chamber 200 and communicates therewith. The HC capture chamber 300 is provided with an atmosphere opening 301. The HC capture chamber 300 is provided with a spiral HC capture device as described above. The base 410 of the spiral HC capture device is sealed with the inner wall of the HC capture chamber 300, and a gap is left between the spring end cover 430 and the inner wall of the HC capture chamber 300.

[0051] The working method of the carbon canister assembly of the present invention is as follows:

[0052] The carbon canister assembly can be divided into a main adsorption chamber 100, a secondary adsorption chamber 200 and a HC capture chamber 300. The main function of the main adsorption chamber 100 is to adsorb most of the HC volatilized from the fuel tank. The chamber is usually filled with activated carbon powder with high adsorption performance. The outside is designed with an adsorption pipe port connected to the fuel tank and a desorption pipe port connected to the engine; the secondary adsorption chamber is mainly used to adsorb a small amount of HC escaping from the main adsorption chamber. The chamber is usually filled with activated carbon powder with low residual performance. The main function of the HC capture chamber is to capture small molecules of HC that migrate from the main adsorption chamber and the secondary adsorption chamber due to the temperature difference between day and night. The chamber is equipped with a spiral HC capture device. The spiral HC capture device is adjusted according to the desorption volume of the carbon canister, the structural size and shape of the canister, the ventilation pressure drop and other parameters. The spiral HC capture device can be used alone or in series. This embodiment is explained in detail with two cases in series.

[0053] The small HC molecules and air that migrated from the secondary adsorption cavity enter the spiral HC capture device from the sub-cavity vents. HC passes through the spiral carbon cavity. Due to the weight difference between air and HC molecules, clean air is concentrated in the middle of the airflow, while small HC molecules are mostly concentrated near the wall of the spiral cavity. Because activated carbon is arranged on the wall, they are captured by the activated carbon, and the relatively clean air is discharged into the atmosphere or enters another spiral HC capture device. The two spiral HC capture devices are designed with a cavity structure to avoid the formation of airflow dead zones. When the canister assembly is desorbed, because the clean air enters the spiral carbon cavity in the reverse direction, and because the activated carbon layer attached to the wall of the spiral carbon cavity is relatively thin, the residual amount of HC is relatively low, and the HC concentration difference between the clean air and the outside is small, the HC diffusion ability is relatively poor, so when the temperature of the vehicle changes day and night, the HC emission is low.

[0054] It should be noted that the description of the above technical solutions is exemplary, and this specification can be embodied in different forms and should not be interpreted as being limited to the technical solutions set forth herein. On the contrary, providing these descriptions will make the disclosure of the present invention thorough and complete, and will fully convey the scope disclosed in this specification to those skilled in the art. In addition, the technical solutions of the present invention are limited only by the scope of the claims.

[0055] The shapes, sizes, ratios, angles, and numbers disclosed for describing various aspects of the present specification and claims are merely examples, and therefore, the present specification and claims are not limited to the details shown. In the following description, when the detailed description of the related known functions or configurations is determined to be unnecessarily obscuring the focus of the present specification and claims, the detailed description will be omitted.

[0056] The features of various embodiments of the present invention may be combined or spliced ​​with each other in part or in whole, and may be performed in various different configurations as those skilled in the art may fully understand. The embodiments of the present invention may be performed independently of each other, or may be performed together through interdependent relationships.

[0057] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field.

Claims

1. A spiral HC capture device, characterized in that: It comprises at least one spiral HC capture unit (400), wherein the spiral HC capture unit (400) comprises a base (410), an activated carbon spiral cylinder (420) and a spring end cover (430); The base (410) comprises a base platform (411), an HC airflow buffer cavity (412) is arranged below the base platform (411), and a vent hole (413) penetrating the base platform (411) is arranged in the middle of the HC airflow buffer cavity (412); The activated carbon spiral cylinder (420) is a cylindrical structure made of an activated carbon substrate spirally wound, and a spiral carbon cavity (421) is formed inside the activated carbon spiral cylinder (420); when the HC airflow flows from the HC airflow buffer cavity (412) into the activated carbon spiral cylinder (420), the HC airflow enters the innermost circle (420a) of the activated carbon spiral cylinder (420) through the vent hole (413), and flows spirally from the inner circle to the outer circle along the spiral carbon cavity (421) of the activated carbon spiral cylinder (420); One end of the activated carbon spiral cylinder (420) is mounted on the base pedestal (411) and communicates with the vent hole (413), and the other end of the activated carbon spiral cylinder (420) is connected to the inner end surface of the spring end cover (430).

2. The spiral HC capture device according to claim 1, characterized in that: A support rib plate group (414) is provided in the HC airflow buffer cavity (412), and the support rib plate group (414) is arranged at intervals in the circumferential direction around the vent hole (413).

3. The spiral HC capture device according to claim 2, characterized in that: The support rib group (414) includes a plurality of first support ribs (4141) and second support ribs (4142) that are alternately arranged, wherein the first support ribs (4141) are fixedly connected to the inner wall of the HC airflow buffer cavity (412), and a gap is left between the second support ribs (4142) and the inner wall of the HC airflow buffer cavity (412).

4. The spiral HC capture device according to claim 1, 2 or 3, characterized in that: The base (410) further comprises a base flange (415), the outer ring of the base flange (415) is provided with an annular groove (416), and a sealing ring (417) is installed in the annular groove (416).

5. The spiral HC capture device according to claim 1, 2 or 3, characterized in that: The activated carbon spiral cylinder (420) is an activated carbon substrate arranged in an Archimedean curve; the outer edge of the vent hole (413) is equidistant from the innermost circle of the activated carbon spiral cylinder (420).

6. The spiral HC capture device according to claim 1, 2 or 3, characterized in that: The thickness of the activated carbon substrate used in the activated carbon spiral cylinder (420) is less than 3 mm, and the distance between two adjacent turns of the activated carbon substrate of the activated carbon spiral cylinder (420) is less than 3 mm; the activated carbon substrate is made by firing ceramic clay and activated carbon, or the activated carbon substrate is a solid substrate coated with an activated carbon layer, and the solid substrate is selected from glass, ceramics, plastic, metal or paper.

7. The spiral HC capture device according to claim 1, 2 or 3, characterized in that: The spring-piece end cover (430) comprises an end cover body (431), and a plurality of spring pieces (432) are arranged on the outer end surface of the end cover body (431); The end cover body (431) is provided with a notch (433) for ventilation; the spring piece (432) comprises an oblique spring piece (4321) and a horizontal spring piece (4322); one end of the oblique spring piece (4321) is connected to the outer end surface of the end cover body (431), and the other end of the oblique spring piece (4321) extends obliquely outward and is fixedly connected to the horizontal spring piece (4322).

8. The spiral HC capture device according to claim 7, characterized in that: The thickness of the spring sheet (432) is less than 3 mm, the angle between the oblique spring sheet (4321) and the end cover body (431) is less than 90°, and the spring sheet outer diameter (432a) of the spring sheet (432) is smaller than the end cover outer diameter (431a) of the end cover body (431).

9. The spiral HC capture device according to claim 1, 2 or 3, characterized in that: When the number of the spiral HC capture units (400) is two or more, the base (410) or the elastic end cover (430) of one spiral HC capture unit (400) abuts against the base (410) or the elastic end cover (430) of another adjacent spiral HC capture unit (400).

10. A carbon canister assembly, comprising a main adsorption chamber (100), a secondary adsorption chamber (200) and a HC capture chamber (300), wherein the main adsorption chamber (100) is provided with an adsorption pipe opening (101) communicating with a fuel tank and a desorption pipe opening (102) communicating with an engine, the HC capture chamber (300) is arranged above the secondary adsorption chamber (200) and communicates therewith, and the HC capture chamber (300) is provided with an atmosphere opening (301), characterized in that: The HC capture cavity (300) is provided with a spiral HC capture device according to any one of claims 1 to 9, the base (410) of the spiral HC capture device is sealed with the inner wall of the HC capture cavity (300), and a gap is left between the spring end cover (430) and the inner wall of the HC capture cavity (300).

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