CN215334940U - Flexible corrugated fuel pipe - Google Patents

Abstract

The utility model discloses a flexible corrugated fuel pipe, which comprises a pipe body, wherein a corrugated section is arranged on the pipe body; the tube body comprises an inner layer, a barrier layer and an outer layer; the material of inlayer and skin is PA12, the barrier layer includes three-layer EVOH. The flexible corrugated fuel pipe adopts the barrier layer containing the EVOH, and has a good partition effect on fuel gas. And the corrugated section is arranged, so that the mounting space around the oil tank can be well adapted, the pipeline can not contact with the oil tank and can not turn to generate abnormal noise, the mounting stress is reduced, vibration is filtered, and the noise is reduced.

Description

Flexible corrugated fuel pipe

Technical Field

The utility model relates to the technical field of fuel pipes, in particular to a flexible corrugated fuel pipe.

Background

At present, with the continuous improvement of the degree of social industrialization, the problem of environmental pollution becomes more and more serious, and as an important factor of air pollution, the problem of automobile emission is also more and more concerned by society. Indicators including automobile exhaust emissions and fuel system permeability are also continually increasing. In this large context, the permeability, anti-bleeding properties of vehicle fuel storage systems and fuel delivery systems are more of a concern. So that new built-in tank structures are more adopted. New built-in tanks require new piping systems to be fitted to them.

Due to the execution of the national six regulations, the fuel system increases the amount of fuel vapor recovery. Fuel vapor in the fuel tank of the automobile needs to be rapidly absorbed by the canister. The design scheme of each large host factory at the initial stage is to increase the pipe diameter of the fuel exhaust pipe, but the installation space around the fuel tank is very narrow. The pipe diameter is great and unable installation to the pipeline can produce the contact abnormal sound with oil tank and automobile body.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a flexible corrugated fuel pipe, which adds a corrugated pipe structure on an original straight pipe without flexibility, reduces installation stress, filters vibration and reduces noise.

In order to solve the technical problem, the utility model aims to realize that:

the utility model relates to a flexible corrugated fuel pipe which comprises a pipe body, wherein a corrugated section is arranged on the pipe body;

the tube body comprises an inner layer, a barrier layer and an outer layer;

the material of inlayer and skin is PA12, the barrier layer includes three-layer EVOH.

On the basis of the above scheme and as a preferable scheme of the scheme: the corrugated sections comprise a first corrugated section and a second corrugated section; and a first smooth section is arranged between the first corrugated section and the second corrugated section.

On the basis of the above scheme and as a preferable scheme of the scheme: a first middle layer is arranged between the blocking layer and the outer layer, and the first middle layer is made of PA 612.

On the basis of the above scheme and as a preferable scheme of the scheme: a second middle layer is arranged between the barrier layer and the inner layer; the second intermediate layer is made of high-density polyethylene, cross-linked polyethylene or high-temperature modified polyethylene.

On the basis of the above scheme and as a preferable scheme of the scheme: the barrier layer 12 comprises a first EVOH layer, a second EVOH layer and a third EVOH layer; a first PA1012 layer is arranged between the first EVOH layer and the second EVOH layer; and a second PA1012 layer is arranged between the second EVOH layer and the third EVOH layer.

The utility model has the beneficial effects that: the flexible corrugated fuel pipe adopts the barrier layer containing the EVOH, and has a good partition effect on fuel gas. And the corrugated section is arranged, so that the mounting space around the oil tank can be well adapted, the pipeline can not contact with the oil tank and can not turn to generate abnormal noise, the mounting stress is reduced, vibration is filtered, and the noise is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a flexible corrugated fuel pipe according to an embodiment;

FIG. 2 is a cross-sectional view of a tube according to an embodiment;

FIG. 3 is a schematic view of a barrier layer according to an embodiment;

fig. 4 is a schematic cross-sectional view of a pipe body according to a second embodiment;

fig. 5 is a schematic structural view of a barrier layer according to a third embodiment.

The designations in the figures illustrate the following: 1-a first corrugated segment; 2-a second ripple section; 3-a first smooth section; 11-an inner layer; 12-a barrier layer; 13-an outer layer; 14-a first intermediate layer; 15-a second intermediate layer; 121-a first EVOH layer; 122-a second EVOH layer; 123-a third EVOH layer; 124-first PA1012 layer; 125-second PA1012 layer.

Detailed Description

The utility model is further described with reference to the following figures and specific examples.

Example one

The present embodiment will be described in detail with reference to fig. 1, 2 and 3. The flexible corrugated fuel pipe comprises a pipe body, wherein a corrugated section is arranged on the pipe body.

The body comprises an inner layer 11, a barrier layer 12 and an outer layer 13. The inner layer 11 and the outer layer 13 are made of PA12, and the barrier layer 12 comprises three layers of EVOH. EVOH combines processability of ethylene polymers with barrier effect of vinyl alcohol polymers, and ethylene-vinyl alcohol copolymers exhibit not only excellent processability but also excellent barrier effect against gases, odors, perfumes, solvents, and the like.

Further, the corrugated sections include a first corrugated section 1 and a second corrugated section 2; and a first smooth section 3 is arranged between the first corrugated section 1 and the second corrugated section 2. Smooth sections are arranged among the first corrugated section 1, the second corrugated section and the joint. The provision of a first smooth section between the first corrugated section 1 and the second corrugated section 2 may make it possible to increase the stability of the corrugated sections.

For the flexible corrugated fuel pipe according to the first embodiment, the inner layer 11 has a thickness of 0.5mm, the barrier layer has a thickness of 0.5mm, and the outer layer 13 has a thickness of 0.5 mm. The elongation at break is tested, and the test result is 245%, which is more than or equal to 200% higher than the standard specification of the elongation at break.

The test structure of the flexible corrugated fuel pipe is 1.5MPa under the bursting pressure at room temperature, which is higher than or equal to 1MPa required by the standard.

And (3) testing the low-temperature impact performance of the related flexible corrugated oil pipe: the pipe is placed at the temperature of minus 40 ℃ for 4 hours, then a 1kg drop weight is used to impact the pipe freely at 500mm, the surface of the pipe has no cracks, and the explosion pressure is 80% at the normal temperature in the low-temperature environment, so that the requirement of 75% is met.

Example two

This embodiment will be described in detail with reference to fig. 4. The flexible corrugated fuel pipe comprises a pipe body, wherein a corrugated section is arranged on the pipe body.

The body comprises an inner layer 11, a barrier layer 12 and an outer layer 13. The inner layer 11 and the outer layer 12 are made of PA12, and the barrier layer 12 comprises three layers of EVOH.

And a first intermediate layer 14 is arranged between the barrier layer 12 and the outer layer 13, and the material of the first intermediate layer 14 is PA 612. PA612, also known as polyamide 612 or nylon 612, has a polyhexamethylene dodecanedioyl diamine component. The PA612 has the characteristics of common PA, and also has the advantages of small relative density, lower water absorption and density, good dimensional stability, higher tensile strength and impact strength.

A second intermediate layer 15 is arranged between the barrier layer 12 and the inner layer 11; the second intermediate layer 15 is made of high-density polyethylene, cross-linked polyethylene or high-temperature modified polyethylene. Because the price of PA12 is expensive, high-density polyethylene can be arranged between the inner layer 11 and the barrier layer 12 to replace PA12, so that the use amount of PA12 can be reduced, and the cost is further reduced.

EXAMPLE III

This embodiment will be described in detail with reference to fig. 5. The flexible corrugated fuel pipe according to the present embodiment is different from the first embodiment in that: the barrier layer 12 in this example includes a first EVOH layer 121, a second EVOH layer 122, and a third EVOH layer 123; a first PA1012 layer 124 is arranged between the first EVOH layer 121 and the second EVOH layer 122; a second PA1012 layer 125 is disposed between the second EVOH layer 122 and the third EVOH layer 123.

Polyamides (polyamides, PA), also known as nylons, tend to be very important among five major engineering plastics (polycarbonates, polyamides, polyphenylene oxides, polyoxymethylene, polybutylene terephthalate). In a plurality of polyamide varieties such as PA6, PA66, PA46, PA11, PA12, PA1010, PA612, PA6T, PA9T and the like, PA66 and PA6 occupy the leading position of the market and are the key points of research. The nylon can be classified into short carbon chain nylon and long carbon chain nylon, and the long carbon chain nylon refers to nylon with more than 10 carbon atoms between two amide groups, such as PA1010, PA1012, PA1212 and the like. The long carbon chain nylon has unique physical and chemical properties, such as low water absorption, good dimensional stability, good toughness, excellent shock resistance and cold resistance, and the like.

The foregoing detailed description of the preferred embodiments of the utility model has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.

Claims (5)

1. The flexible corrugated fuel pipe is characterized by comprising a pipe body, wherein a corrugated section is arranged on the pipe body;

the tube body comprises an inner layer (11), a barrier layer (12) and an outer layer (13);

the material of the inner layer (11) and the outer layer (13) is PA12, and the barrier layer (12) comprises three layers of EVOH.

2. Flexible corrugated fuel pipe according to claim 1, characterized in that the corrugated sections comprise a first corrugated section (1) and a second corrugated section (2); and a first smooth section (3) is arranged between the first corrugated section (1) and the second corrugated section (2).

3. Flexible corrugated fuel pipe according to claim 1, characterized in that a first intermediate layer (14) is arranged between the barrier layer (12) and the outer layer (13), the material of the first intermediate layer (14) being PA 612.

4. Flexible corrugated fuel pipe according to claim 1, characterized in that a second intermediate layer (15) is arranged between the barrier layer (12) and the inner layer (11).

5. Flexible corrugated fuel pipe according to claim 1, characterized in that the barrier layer (12) comprises a first EVOH layer (121), a second EVOH layer (122) and a third EVOH layer (123); a first PA1012 layer (124) is arranged between the first EVOH layer (121) and the second EVOH layer (122); a second PA1012 layer (125) is arranged between the second EVOH layer (122) and the third EVOH layer (123).

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