Fuel tank ventilation pipeline and automobile fuel tank
By using an oil-resistant PE inner layer and a PP outer layer structure in the fuel tank venting pipeline, combined with an adhesive layer and an anti-permeability layer, the problem of excessive precipitates was solved, achieving the effects of low precipitates and cost reduction.
Patent Information
- Application Number
- CN202520411365.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-10
- Publication Date
- 2026-02-24
- Estimated Expiration
- 2035-03-10
AI Technical Summary
Existing fuel tank vent pipe materials release too much residue when in contact with fuel, leading to problems such as fuel injector blockage. Furthermore, current technology is insufficient to meet OEMs' requirements for low residue levels.
It adopts a PE oil-resistant inner layer and a PP outer layer structure with an adhesive layer in the middle. The outer layer can be a waterproof layer with an optimized thickness ratio of 20-60%:5-20%:20-60% to reduce precipitates. It adopts a PE/HV/PP three-layer or PE/HV/EVOH/HV/PP five-layer structure to improve oil resistance and mechanical properties.
Significantly reduces precipitates, achieving insoluble precipitates of 0.04 g/m² and soluble precipitates of 3.48 g/m², far below the standard, reducing costs by 25-50% while maintaining pipeline performance.
Smart Images
Figure CN223939021U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of fuel tank vent pipe technology, specifically to fuel tank vent pipe and automobile fuel tank. Background Technology
[0002] Fuel tank vent lines are divided into internal fuel tank vent lines and external fuel tank vent lines. External fuel tank vent lines, depending on requirements, have fuel permeability requirements and need to add a barrier layer. The material of existing fuel tank vent lines is mostly EVOH (ethylene-vinyl alcohol copolymer).
[0003] In existing piping structures, such as internal pipes (where both inner and outer materials come into contact with fuel) made of PE / HV / PA6 and external pipes (where the inner layer of the pipe comes into contact with fuel) made of PA12 / HV / EVOH / HV / PA12, substances (plasticizers, lubricants, etc. used in nylon modification) will leach out when in contact with fuel or fuel vapor. Excessive leachate can cause problems such as injector clogging. Currently, more and more OEMs are demanding low leachate levels in their piping systems. Utility Model Content
[0004] The purpose of this invention is to provide a fuel tank venting pipe and a car fuel tank to alleviate the technical problem of excessive exudate on the surface of the venting pipe in the prior art.
[0005] In a first aspect, this utility model embodiment provides an oil tank venting pipeline, comprising an oil-resistant PE inner layer and a PP outer layer;
[0006] The PP outer layer is sleeved over the PE oil-resistant inner layer, and an adhesive layer is provided between the PP outer layer and the PE oil-resistant inner layer;
[0007] The thickness ratio of the PP outer layer, the adhesive layer, and the PE oil-resistant inner layer is between 20-60%: 5-20%: 20-60%.
[0008] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thickness ratio of the PP outer layer, the adhesive layer, and the PE oil-resistant inner layer is 60%:5%:35%.
[0009] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thickness ratio of the PP outer layer, the adhesive layer and the PE oil-resistant inner layer is 35%:5%:60%.
[0010] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thickness ratio of the PP outer layer, the adhesive layer and the PE oil-resistant inner layer is 40%:20%:40%.
[0011] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thickness ratio of the PP outer layer, the adhesive layer and the PE oil-resistant inner layer is 45%:10%:45%.
[0012] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the above-mentioned oil tank venting pipeline further includes an anti-permeability layer;
[0013] The anti-permeability layer is sleeved on the outside of the PE oil-resistant inner layer, and a first adhesive layer is provided between the anti-permeability layer and the PE oil-resistant inner layer;
[0014] The PP outer layer is fitted over the PE oil-resistant inner layer; a second adhesive layer is provided between the PP outer layer and the anti-permeability layer.
[0015] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thickness ratio of the PP outer layer, the first adhesive layer, the anti-permeability layer, the second adhesive layer and the PE oil-resistant inner layer is between 20-60%: 5-20%: 5-20%: 5-20%: 20-60%.
[0016] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thicknesses of the PP outer layer, the first adhesive layer, the anti-permeability layer, the second adhesive layer, and the PE oil-resistant inner layer are 40%:5%:10%:5%:40%.
[0017] In conjunction with the first aspect, this utility model embodiment provides a possible implementation of the first aspect, wherein the thicknesses of the PP outer layer, the first adhesive layer, the anti-permeability layer, the second adhesive layer, and the PE oil-resistant inner layer are 30%:5%:10%:5%:50%.
[0018] Secondly, this utility model embodiment provides a car fuel tank, including the fuel tank vent pipe.
[0019] Beneficial effects:
[0020] This utility model provides a fuel tank venting pipeline, including a PE oil-resistant inner layer and a PP outer layer; the PP outer layer is sleeved on the outside of the PE oil-resistant inner layer, and an adhesive layer is provided between the PP outer layer and the PE oil-resistant inner layer; the thickness ratio of the PP outer layer, the adhesive layer and the PE oil-resistant inner layer is between 20-60%: 5-20%: 20-60%.
[0021] Specifically, the system employs an oil-resistant PE inner layer and a PP outer layer. PE material is used for the inner layer due to its excellent oil resistance, while PP material is used for the outer layer due to its superior mechanical properties, heat resistance, cold resistance, weather resistance, and chemical resistance. This outermost layer ensures that the fuel delivery system is unaffected by environmental factors. Furthermore, precipitation tests show that the insoluble precipitates in the fuel tank venting pipe with the PE oil-resistant inner layer and PP outer layer are 0.04 g / m² and soluble precipitates are 3.48 g / m², far below the acceptable limits of ≤0.5 g / m² for insoluble precipitates and ≤6 g / m² for soluble precipitates. Moreover, the cost of the fuel tank venting pipe using the PE oil-resistant inner layer and PP outer layer is 25% lower than existing technologies.
[0022] This utility model provides a car fuel tank, including a fuel tank vent pipe.
[0023] Specifically, the automotive fuel tank provided by this utility model has the aforementioned advantages compared with the prior art, which will not be elaborated here. Attached Figure Description
[0024] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0025] Figure 1 A cross-sectional view of the fuel tank venting pipeline provided in this embodiment of the present utility model, which has a three-layer structure;
[0026] Figure 2 A cross-sectional view of the fuel tank venting pipeline provided in this embodiment of the utility model, which has a five-layer structure.
[0027] icon:
[0028] 100-PE oil-resistant inner layer;
[0029] 200-PP outer layer;
[0030] 300 - Adhesive layer;
[0031] 400 - Impermeable layer. Detailed Implementation
[0032] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0033] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0036] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.
[0037] See Figure 1 and Figure 2 As shown, this embodiment provides a fuel tank venting pipeline, including a PE oil-resistant inner layer 100 and a PP outer layer 200; the PP outer layer 200 is sleeved on the PE oil-resistant inner layer 100, and an adhesive layer 300 is provided between the PP outer layer 200 and the PE oil-resistant inner layer 100; the thickness ratio of the PP outer layer 200, the adhesive layer 300 and the PE oil-resistant inner layer 100 is between 20-60%: 5-20%: 20-60%.
[0038] Specifically, the system employs an oil-resistant PE (polyethylene) inner layer and a PP (polypropylene) outer layer. PE, with its excellent oil resistance, forms the inner layer, while PP, with its superior mechanical properties, heat resistance, cold resistance, weather resistance, and chemical resistance, ensures that the fuel delivery system remains unaffected by environmental factors. Furthermore, a precipitation test using the PE oil-resistant inner layer 100 and the PP outer layer 200 showed an insoluble precipitate of 0.04 g / m² and a soluble precipitate of 3.48 g / m², significantly lower than the acceptable standards of ≤0.5 g / m² for insoluble matter and ≤6 g / m² for soluble matter. Moreover, the cost of the fuel tank venting system using the PE oil-resistant inner layer 100 and the PP outer layer 200 is 25% lower than existing technologies.
[0039] The thickness ratio of the PP outer layer 200, adhesive layer 300, and PE oil-resistant inner layer 100 can be set to 60%:5%:35%. Alternatively, the thickness ratio can be set to 35%:5%:60%. Or, the thickness ratio can be set to 45%:10%:45%. Or, the thickness ratio can be set to 40%:20%:40%. Or, the thickness ratio can be set to 60%:20%:20%. Or, the thickness ratio can be set to 20%:20%:60%.
[0040] See Figure 1 and Figure 2 As shown, in the optional embodiment, the oil tank venting pipeline further includes an anti-permeability layer 400; the anti-permeability layer 400 is sleeved on the outside of the PE oil-resistant inner layer 100, and a first adhesive layer 300 is provided between the anti-permeability layer 400 and the PE oil-resistant inner layer 100; the PP outer layer 200 is sleeved on the outside of the PE oil-resistant inner layer 100; and a second adhesive layer 300 is provided between the PP outer layer 200 and the anti-permeability layer 400.
[0041] The adhesive layer 300 can be made of HV (synthetic resin).
[0042] The anti-permeability layer 400 can be made of EVOH (ethylene-vinyl alcohol copolymer), which has excellent barrier properties and can prevent fuel vapor from permeating outward through the pipeline.
[0043] The thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 is between 20-60%: 5-20%: 5-20%: 5-20%: 20-60%.
[0044] Specifically, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 20%:5%:10%:5%:60%. Alternatively, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 20%:20%:20%:20%:20%. Alternatively, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 25%:5%:5%:5%:60%. Alternatively, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 30%:5%:10%:5%:50%. Alternatively, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 40%:5%:10%:5%:40%. Alternatively, the thickness ratio of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 50%:5%:10%:5%:30%. Alternatively, the thicknesses of the PP outer layer 200, the first adhesive layer 300, the anti-permeability layer 400, the second adhesive layer 300, and the PE oil-resistant inner layer 100 can be set to 60%:5%:10%:5%:20%.
[0045] It should be noted that the oil tank venting pipeline provided in this embodiment uses a PE / HV / PP three-layer structure and a PE / HV / EVOH / HV / PP five-layer structure. The insoluble precipitate is 0.04 g / m2 and the soluble precipitate is 3.48 g / m2. The commonly used judgment standard for precipitation test is: insoluble precipitate ≤ 0.5 g / m2 and soluble precipitate ≤ 6 g / m2.
[0046] Furthermore, the fuel tank venting pipeline provided in this embodiment, employing a PE / HV / PP three-layer structure, reduces costs by approximately 25% compared to the existing PE / HV / PA6 three-layer structure; the fuel tank venting pipeline provided in this embodiment, employing a PE / HV / EVOH / HV / PP five-layer structure, reduces costs by approximately 50% compared to the existing PA12 / HV / EVOH / HV / PA12 five-layer structure. Thus, the fuel tank venting pipeline provided in this embodiment can reduce production costs without compromising pipeline performance.
[0047] In addition, the fuel tank venting pipe provided in this embodiment can adopt a bare pipe structure or a corrugated pipe structure.
[0048] This embodiment provides a car fuel tank, including a fuel tank vent pipe.
[0049] Specifically, the automotive fuel tank provided in this embodiment has the advantages of the aforementioned fuel tank venting pipeline compared to the prior art, which will not be elaborated here.
[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A fuel tank vent pipe, characterized in that, include: PE oil-resistant inner layer (100) and PP outer layer (200); The PP outer layer (200) is sleeved on the PE oil-resistant inner layer (100), and an adhesive layer (300) is provided between the PP outer layer (200) and the PE oil-resistant inner layer (100); The thickness ratio of the PP outer layer (200), the adhesive layer (300), and the PE oil-resistant inner layer (100) is between 20-60%: 5-20%: 20-60%.
2. The fuel tank venting pipeline according to claim 1, characterized in that, The thickness ratio of the PP outer layer (200), the adhesive layer (300), and the PE oil-resistant inner layer (100) is 60%:5%:35%.
3. The fuel tank venting pipeline according to claim 1, characterized in that, The thickness ratio of the PP outer layer (200), the adhesive layer (300), and the PE oil-resistant inner layer (100) is 35%:5%:60%.
4. The fuel tank venting pipeline according to claim 1, characterized in that, The thickness ratio of the PP outer layer (200), the adhesive layer (300), and the PE oil-resistant inner layer (100) is 40%:20%:40%.
5. The fuel tank venting pipeline according to claim 1, characterized in that, The thickness ratio of the PP outer layer (200), the adhesive layer (300), and the PE oil-resistant inner layer (100) is 45%:10%:45%.
6. The fuel tank venting pipeline according to claim 1, characterized in that, It also includes an impermeable layer (400); The anti-permeability layer (400) is sleeved on the outside of the PE oil-resistant inner layer (100), and a first adhesive layer (300) is provided between the anti-permeability layer (400) and the PE oil-resistant inner layer (100); The PP outer layer (200) is sleeved on the outside of the PE oil-resistant inner layer (100); a second adhesive layer (300) is provided between the PP outer layer (200) and the anti-permeability layer (400).
7. The fuel tank venting pipeline according to claim 6, characterized in that, The thickness ratio of the PP outer layer (200), the first adhesive layer (300), the anti-permeability layer (400), the second adhesive layer (300), and the PE oil-resistant inner layer (100) is between 20-60%: 5-20%: 5-20%: 5-20%: 20-60%.
8. The fuel tank venting pipeline according to claim 7, characterized in that, The thicknesses of the PP outer layer (200), the first adhesive layer (300), the anti-permeability layer (400), the second adhesive layer (300), and the PE oil-resistant inner layer (100) are 40%:5%:10%:5%:40%.
9. The fuel tank venting pipeline according to claim 7, characterized in that, The thicknesses of the PP outer layer (200), the first adhesive layer (300), the anti-permeability layer (400), the second adhesive layer (300), and the PE oil-resistant inner layer (100) are 30%: 5%: 10%: 5%: 50%.
10. A car fuel tank, characterized in that, Includes the fuel tank venting line as described in any one of claims 1-9.