CN215111016U - Fuel pipe that six hyposmosis of state discharged - Google Patents

Abstract

The application provides a fuel pipe with national six low permeation discharge, which sequentially comprises a first barrier layer, a first glue layer, a second barrier layer, a second glue layer and an outer layer from the inside to the outside of the fuel pipe; the first barrier layer is a fluorine resin layer, and the second barrier layer is an ethylene-vinyl alcohol copolymer layer. According to the fuel pipe, the multilayer pipe layered structure is redesigned, the fuel pipe comprises two blocking layers, the first blocking layer is a fluororesin (EFEP) layer, and a polytetrafluoroethylene molecular chain in the fluororesin is regularly and compactly distributed, so that the fluororesin layer has good blocking performance; the second barrier layer is ethyleneThe ethylene-vinyl alcohol copolymer (EVOH) has good barrier effect, the fuel oil seepage prevention capability is greatly improved and the fuel oil seepage amount is greatly reduced through the double barrier effect of the first barrier layer and the second barrier layer, and the seepage emission value is less than 26.5mg/m²And d, meeting the requirement of environmental protection.

Description

Fuel pipe that six hyposmosis of state discharged

Technical Field

The application relates to the technical field of automobiles, in particular to a fuel pipe for low-permeability discharge of China-six.

Background

The statements in this application as background to the related art related to this application are merely provided to illustrate and facilitate an understanding of the contents of the present application and are not to be construed as an admission that the applicant expressly or putatively admitted the prior art of the filing date of the present application at the first filing date.

The fuel evaporative emission is an important component of the emission pollution source of gasoline vehicles and is also an emission source which is strictly controlled by the nation aiming at the fuel evaporative emission of motor vehicles. The fuel oil permeation and discharge of the vehicle oil pipe is one of the main channels of the fuel oil evaporation and discharge of the gasoline vehicle.

With the transformation of the whole vehicle emission from 'national five' to 'national six', the requirements on low precipitation and flame retardance of fuel pipes are more and more strict. Meanwhile, in order to effectively reduce evaporative permeation emission of pollutants, evaporative permeation of fuel oil from a fuel oil pipe needs to be reduced, so that the aims of safety, energy conservation and environmental protection are fulfilled. This also makes the automotive industry further put demands on lower precipitation and lower permeability of fuel lines.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a fuel pipe with national six low permeation discharge, which sequentially comprises a first barrier layer, a first glue layer, a second barrier layer, a second glue layer and an outer layer from the inside to the outside of the fuel pipe; the first barrier layer is a fluorine resin layer, and the second barrier layer is an ethylene-vinyl alcohol copolymer layer.

In some of the embodiments, the thickness of the fluororesin layer is 0.05mm to 0.15 mm.

In some of these embodiments, the ethylene vinyl alcohol copolymer layer has a thickness of 0.05mm to 0.15 mm.

In some embodiments, the first adhesive layer and the second adhesive layer are both adhesive resin layers, the thickness of the first adhesive layer is 0.25 mm-0.35 mm, and the thickness of the first adhesive layer is 0.05-0.15 mm.

In some of the embodiments, the outer layer is a polydodecalactam layer, and the thickness of the outer layer is 0.35-0.45 mm.

The above technical scheme of this application has following advantage: by redesigning the layered structure of the multilayer pipe, the fuel pipe comprises two barrier layers, the first barrier layer is a fluororesin (EFEP) layer, and the regular and dense arrangement of polytetrafluoroethylene molecular chains in the fluororesin can enable the fluororesin layer to have good barrier property; the second barrier layer is an ethylene-vinyl alcohol copolymer (EVOH) layer, the ethylene-vinyl alcohol copolymer has good barrier effect, and the dual barrier effect of the first barrier layer and the second barrier layer greatly improves the fuel oil permeation prevention capability, namely greatly reduces the fuel oil permeation amount, and the permeation emission value is less than 26.5mg/m²And d, thereby achieving the purposes of safety, energy conservation and environmental protection.

Additional aspects and advantages of the present application will be set forth in part in the description which follows, or may be learned by practice of the present application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic cross-sectional view of a low-permeability fuel pipe of the national model six of the present application.

Wherein, the corresponding relation between the reference numbers and the part names in fig. 1 is:

a first barrier layer 10, a first glue layer 20, a second barrier layer 30, a second glue layer 40, an outer layer 50.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

The following discussion provides a number of embodiments of the application. While each embodiment represents a single combination of applications, the various embodiments of the disclosure may be substituted or combined in any combination, and thus, the disclosure is intended to include all possible combinations of the same and/or different embodiments of what is described. Thus, if one embodiment comprises A, B, C and another embodiment comprises a combination of B and D, then this application should also be considered to comprise an embodiment that comprises A, B, C, D in all other possible combinations, although this embodiment may not be explicitly recited in the text below.

As shown in fig. 1, the fuel pipe with low permeation and emission in the sixth aspect of the present application includes, in order from inside to outside of the fuel pipe, a first barrier layer 10, a first glue layer 20, a second barrier layer 30, a second glue layer 40, and an outer layer 50; the first barrier layer 10 is a fluororesin layer, and the second barrier layer 30 is an ethylene-vinyl alcohol copolymer layer. A thermoplastic resin containing fluorine atoms in the molecular structure of the fluororesin. Has the characteristics of excellent high and low temperature resistance, dielectric property, chemical stability, weather resistance, incombustibility, non-adhesiveness, low friction coefficient and the like. The main types of the fluororesin include Polytetrafluoroethylene (PTFE), Polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), ethylene-tetrafluoroethylene copolymer (ETFE), ethylene-chlorotrifluoroethylene copolymer (ECTFE), polyvinyl fluoride (PVF), and the like. Wherein polytetrafluoroethylene is taken as the main material. The ethylene-vinyl alcohol copolymer not only shows excellent processability, but also shows excellent blocking effect on gas, smell, perfume, solvent and the like, has higher mechanical strength, elasticity, surface hardness, wear resistance and weather resistance, has stronger antistatic property, and is a high-barrier material which is applied most frequently all the time.

According to the low-permeability fuel pipe for the national six, a multilayer pipe layered structure is redesigned, the fuel pipe comprises two blocking layers, the first blocking layer 10 is a fluororesin (EFEP) layer, and polytetrafluoroethylene molecular chains in the fluororesin are regularly and compactly distributed, so that the fluororesin layer has good blocking performance; the second barrier layer 30 is an ethylene-vinyl alcohol copolymer (EVOH) layer, the ethylene-vinyl alcohol copolymer has good barrier effect, the fuel oil permeation prevention capacity is greatly improved through the double barrier effect of the first barrier layer 10 and the second barrier layer 30, the fuel oil permeation amount is greatly reduced, and the permeation emission value is smaller than that of the fuel oil

26.5mg/m²And d, thereby achieving the purposes of safety, energy conservation and environmental protection.

In one embodiment of the present application, the fluororesin layer has a thickness of 0.05mm to 0.15 mm.

If the thickness of the fluororesin layer is less than 0.05mm, the thickness of the fluororesin layer is thin, the barrier effect of the fluororesin layer is low, and fuel easily seeps out of the fluororesin layer. If the thickness of the fluororesin layer is more than 0.15mm, the thickness of the fluororesin layer is thick, wasting material, and thus, the thickness of the fluororesin layer is 0.05mm

Within 0.15mm, the fuel can be effectively prevented from leaking out of the fluororesin layer, and the material of which the fluororesin layer is made is minimized.

In one embodiment of the present application, the ethylene vinyl alcohol copolymer layer has a thickness of 0.05mm

～0.15mm。

If the thickness of the ethylene-vinyl alcohol copolymer layer is less than 0.05mm, the thickness of the ethylene-vinyl alcohol copolymer layer is small, the barrier effect of the ethylene-vinyl alcohol copolymer layer is low, and fuel easily seeps out of the ethylene-vinyl alcohol copolymer layer. If the thickness of the ethylene-vinyl alcohol copolymer layer is greater than 0.15mm, the thickness of the ethylene-vinyl alcohol copolymer layer is thick, which wastes material, and therefore, the thickness of the ethylene-vinyl alcohol copolymer layer is within 0.05mm to 0.15mm, which can effectively prevent fuel from leaking out of the ethylene-vinyl alcohol copolymer layer, and the material of which the ethylene-vinyl alcohol copolymer layer is made is minimized.

In one embodiment of the application, the first adhesive layer and the second adhesive layer are both adhesive resin layers, the thickness of the first adhesive layer is 0.25 mm-0.35 mm, and the thickness of the first adhesive layer is 0.05-0.15 mm.

The adhesive resin is a kind of graft modified polymer, and by grafting the comonomer on the main chain of the polymer to form a functional branched chain, the functional branched chain exposed outside the main chain can quickly and efficiently react with the adhered material, thereby realizing the adhesion of the material.

In one embodiment of the application, the outer layer is a polydodecalactam (PA12) layer, and the thickness of the outer layer is 0.35-0.45 mm.

PA12 is a very good electrical insulator and, like other polyamides, does not affect the insulating properties due to moisture. It has excellent impact resistance and mechanical and chemical stability.

In addition, the fuel pipe that six hyposmosis of country protected of the utility model discharged adopts multilayer coextrusion technology preferentially to the advantage of multiple material of full play, some shortcomings of avoiding single material.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application. The term "plurality" means two or more unless expressly limited otherwise. The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (6)

1. The fuel pipe with low permeation and discharge for China and China is characterized by comprising a first barrier layer, a first glue layer, a second barrier layer, a second glue layer and an outer layer from the inside to the outside of the fuel pipe in sequence; the first barrier layer is a fluorine resin layer, and the second barrier layer is an ethylene-vinyl alcohol copolymer layer.

2. The fuel pipe according to claim 1,

the thickness of the fluorine resin layer is 0.05 mm-0.15 mm.

3. The fuel pipe according to claim 1,

the thickness of the ethylene-vinyl alcohol copolymer layer is 0.05 mm-0.15 mm.

4. The fuel pipe according to claim 1,

the first glue film and the second glue film are both bonding resin layers, the thickness of the first glue film is 0.25 mm-0.35 mm, and the thickness of the first glue film is 0.05-0.15 mm.

5. The fuel pipe according to claim 1,

the outer layer is a polydodecalactam layer, and the thickness of the outer layer is 0.35-0.45 mm.

6. The fuel pipe of claim 1, formed using a multi-layer co-extrusion process.

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