CN113236878A

CN113236878A - Plastic oil filling pipe

Info

Publication number: CN113236878A
Application number: CN202110578546.5A
Authority: CN
Inventors: 姜林; 高德俊; 吕昊; 顾华; 张涛; 郝飞; 葛学继; 刘建林
Original assignee: Yapp Automotive Parts Co Ltd
Current assignee: Yapp Automotive Parts Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2021-08-10

Abstract

The application discloses plastics add oil pipe, plastics add oil pipe and are connected with the fuel tank, and plastics add oil pipe and include at least one flexible ripple section, and the wall thickness of the crest of flexible ripple section is greater than the wall thickness of the trough of flexible ripple section. This application makes to add the oil pipe and has certain flexibility on the basis of keeping its mechanical strength performance through the different wall thicknesses of crest and trough department, avoids appearing the oil pipe fracture oil leak that adds that the car side collision in-process produced.

Description

Plastic oil filling pipe

Technical Field

The application relates to the technical field of automobile fuel tanks, in particular to a plastic oil filling pipe.

Background

Carry out the rigid connection through the welding between traditional plastics oil filling pipe and the plastics oil tank, plastics oil filling pipe and welded connection structure make whole structure do not possess any flexibility, when the automobile takes place side collision, probably have the problem that the oil filling pipe fracture leads to the oil leak.

At present, one of the forming methods of plastic hollow pipes (such as plastic oil filling pipes) is extrusion forming, the extrusion forming process has great advantages in forming linear hollow pipes, the uniformity of the wall thickness of the pipes is good, the length is not limited, but the cross sections of the pipes are unique in the forming process and cannot realize the alternate change of the sizes of the cross sections on the same pipe, so the design freedom degree of the plastic hollow pipes in the extrusion forming process is low.

In addition, the ripple that traditional extrusion molding technology produced adds oil pipe and stereotypes and prevent that the rubble from strikeing through backplate structure, and accessory quantity is many to the accessory occupies and adds oil pipe border space on every side, has improved the installation requirement and has installed the degree of difficulty.

Disclosure of Invention

The application provides a plastics adds oil pipe makes to add oil pipe and has certain flexibility on the basis that keeps its mechanical strength performance through the different wall thicknesses of crest and trough department, avoids appearing the oil pipe fracture oil leak that adds that car side collision in-process produced.

The application provides a plastics adds oil pipe, plastics add oil pipe and are connected with the fuel tank, and plastics add oil pipe and include at least one flexible ripple section, and the wall thickness of the crest of flexible ripple section is greater than the wall thickness of the trough of flexible ripple section.

Preferably, the minimum wall thickness of the flexible corrugated section is greater than the first threshold value, and the minimum wall thickness is located at the trough of the wave.

Preferably, the ratio of the wave height to the wavelength of the flexible wave band is greater than the second threshold value.

Preferably, the wave height is equal to or greater than the third threshold value.

Preferably, a first smooth section and a second smooth section are respectively arranged at two ends of the plastic oil filling pipe, and a third smooth section is arranged between adjacent flexible corrugated sections;

the plastic oil filling pipe is integrally formed through a blow molding process.

Preferably, the plastic oil filling pipe comprises a conductive layer, a first new material layer, a blocking layer, a material returning layer and a second new material layer from inside to outside, and adhesives are arranged between the first new material layer and the blocking layer and between the blocking layer and the material returning layer.

Preferably, the barrier layer is an ethylene vinyl alcohol copolymer material.

Preferably, the first and second virgin layers are each a high density polyethylene material.

Preferably, the regrind layer is a high density polyethylene material.

Preferably, the end of the second smooth section is provided with a welding boss.

Further features of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

FIG. 1 is a block diagram of a plastic filler tube provided herein;

FIG. 2 is a schematic cross-sectional view of a plastic filler tube provided herein;

FIG. 3 is a schematic diagram of a flexible corrugated section provided herein.

The figures are labeled as follows:

1-first smooth segment 2-flexible corrugated segment 3-second smooth segment

4-fuel tank connecting part 5-assembling part 21-wave crest

22-trough H-wave height D1-positive half-cycle wavelength

D2-negative half-cycle wave length a-conductive layer b-first novel material layer

c-Binder d-Barrier e-Binder

f-recycled material layer g-second new material layer

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

The application provides a plastics adds oil pipe and is connected with the fuel tank, and this plastics adds oil pipe and passes through blow molding technology integrated into one piece. The plastics oil filling pipe includes first smooth section 1, the smooth section 3 of second and the setting of both ends and is equipped with the smooth section of third between the smooth section 2 of adjacent flexible ripple section 2 at least one between first smooth section 1 and the smooth section 3 of second. The end of the first smooth section is provided with an assembly part 5 for assembly with other parts to form a filler pipe assembly connected with the fuel tank. The end of the second smooth section 3 is provided with a fuel tank connection 4 for connection to a fuel tank. The assembling part 5, the fuel tank connecting part 4 and the flexible corrugated section are integrally formed, independent processing is not needed, the processing technology is simplified, and meanwhile the integral quality of the oil filling pipe is also ensured.

It should be noted that the smooth section is referred to as a flexible corrugated section, meaning that the smooth section is not provided with a corrugated structure.

As an example, a flexible corrugated section 2 is provided on the plastic filler tube as shown in FIG. 1.

The structure of the flexible corrugated section 2 is shown in fig. 3, the flexible corrugated section 2 has a wave height H, a positive half-cycle wavelength D1 and a negative half-cycle wavelength D2, and the sum of D1 and D2 is the wavelength D.

In the present application, the corrugated structure of the flexible corrugated segment may be a symmetrical sine wave corrugated structure (D1 ≠ D2), or an asymmetrical sine wave corrugated structure (D1 ≠ D2).

In the present application, as shown in fig. 3, the wall thickness of the crests 21 of the flexible corrugated section 2 is greater than the wall thickness of the troughs 22 of the flexible corrugated section 2. The minimum wall thickness of the flexible corrugated section 2 is greater than a first threshold value and the minimum wall thickness is located at the wave trough 22. The wave height H is equal to or greater than the third threshold value. The ratio of the wave height H to the wavelength D of the flexible wave band 2 is greater than or equal to a second threshold value.

Preferably, the first threshold is 0.8 mm.

Preferably, the second threshold is 0.4. .

Preferably, the third threshold is 4 mm.

During blow molding, if the wave height is too small, the molding material of the oil filling pipe cannot be effectively stretched in the mold, so that the wall thicknesses of the wave crests and the wave troughs are uniform, and the flexibility and the strength are difficult to be considered in the structure. In this application, great crest wall thickness makes plastics oil pipe possess better mechanical strength performance on the flexible ripple section, need not the backplate and just can satisfy resistant rubble and strike, and less trough wall thickness makes plastics oil pipe possess better flexibility for the flexibility and the intensity of ripple section can both satisfy the engineering requirement. The larger the wavelength and wavenumber, the larger the angle of bending of the flexible corrugated section.

In this application, fuel tank connecting portion 5 is connected with the fuel tank through welding or grabbing the mode to satisfy different demands. The filler tube assembly is connected with the fuel tank to form a fuel tank assembly system.

As an embodiment, the fuel tank connecting part 5 is a welding boss, and the outer surface of the welding boss is the outer layer material of the oil filling pipe and is used for being welded with the fuel tank. The inner surface of the welding boss is a conductive layer, so that good conductive characteristics are ensured. The welding boss increases the thickness of the oil filling pipe and ensures the welding strength. And, be equipped with smooth transition portion on the smooth section 3 of second near the welding boss, guarantee good refuel smoothness nature.

As another embodiment, the fuel connecting part 5 is a clamping connecting structure, the second smooth section 3 is connected with the fuel inlet control valve or a quick-inserting structure in the hot state of the plastic fuel filling pipe, and good sealing performance is obtained through external extrusion or natural cooling pipeline compression connecting structure.

In this application, as shown in fig. 2, the plastics add oil pipe from inside to outside including conducting layer a, first new bed of material b, barrier layer d, feed back layer f and the new bed of material g of second, be equipped with binder c and e between first new bed of material b and the barrier layer d and between barrier layer d and the feed back layer f respectively.

Preferably, the barrier layer d is an ethylene-vinyl alcohol copolymer material (EVOH). EVOH has fuel penetration resistance properties and reduces emissions.

Preferably, the first and second virgin layers b, g, respectively, are high density polyethylene materials (HDPE).

Preferably, the return layer f is a high density polyethylene material (HDPE).

This application adopts cavity body forming die to produce plastics to add oil pipe. The hollow pipe body forming die comprises an upper die and a lower die, wherein an upper die cavity is arranged on the upper die, a lower die cavity is arranged on the lower die, the upper die cavity and the lower die cavity are arranged oppositely, and the buckled die cavity forms the outline of the hollow pipe body.

Specifically, the upper cavity is a non-integral type cavity, the upper cavity is provided with an upper core-pulling device, the lower cavity is a non-integral type cavity, and the lower cavity is provided with a lower core-pulling device. The upper core-pulling device and the lower core-pulling device are arranged oppositely, the upper core-pulling device is independent of the main body of the upper cavity and moves forwards or backwards, and the lower core-pulling device is independent of the main body of the lower cavity and moves forwards or backwards, so that the corrugated structure with the wall thickness can be obtained conveniently, and demolding is easy. And after demoulding, cutting off the air blowing and air outlet parts of the high-pressure blowing needles at the head and the tail of the oil filling pipe, and cooling to obtain the plastic oil filling pipe. This application is through last device of loosing core and the control of the regional wall thickness of device realization ripple down, and high temperature HDPE plastic material blow molding in the mould utilizes the tensile flow characteristic of high temperature HDPE material in the mould, reasonable overall mould design to obtain the ripple structure of ideal.

The utility model provides a plastics adds oil pipe and adopts multilayer material, High Density Polyethylene (HDPE) is as the main material, the intermediate level adopts EVOH barrier material, conducting material is adopted to the inlayer, when making plastics add oil pipe and fuel tank welding, utilize outer High Density Polyethylene (HDPE) material to weld, welding strength has been guaranteed, intermediate level EVOH material and inlayer conducting material make plastics add oil pipe and possess low fuel permeability and good electric conductive property simultaneously, plastics add oil pipe and have lower emission performance and higher security.

Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims

1. The plastic fuel filling pipe is connected with a fuel tank and is characterized by comprising at least one flexible corrugated section, wherein the wall thickness of the wave crest of the flexible corrugated section is larger than that of the wave trough of the flexible corrugated section.

2. The plastic fuel filler tube of claim 1, wherein the flexible corrugated section has a minimum wall thickness greater than a first threshold and the minimum wall thickness is at a trough of a wave.

3. The plastic fuel filler tube of claim 1 or 2, wherein the flexible corrugated section has a wave height to wavelength ratio greater than a second threshold.

4. The plastic fuel filler tube of claim 3, wherein the wave height is equal to or greater than a third threshold.

5. The plastic fuel filler tube of claim 1, wherein a first smooth section and a second smooth section are provided at each end of the plastic fuel filler tube, and a third smooth section is provided between adjacent flexible corrugated sections;

6. The plastic fuel filler tube of claim 1, comprising, from the inside out, a conductive layer, a first virgin layer, a barrier layer, a regrind layer, and a second virgin layer, wherein an adhesive is disposed between the first virgin layer and the barrier layer and between the barrier layer and the regrind layer.

7. The plastic fuel filler tube of claim 6, wherein said barrier layer is an ethylene vinyl alcohol copolymer material.

8. The plastic filler tube of claim 6 or 7, wherein the first and second virgin plies are each of high density polyethylene material.

9. The plastic filler tube of claim 6, wherein the backfill layer is a high density polyethylene material.

10. The plastic fuel filler tube of claim 5, wherein the end of said second smooth section is provided with a weld boss.