Double-material injection oil tank valve body

Abstract

The utility model provides a double-material injection oil tank valve body which comprises an inner framework layer and an outer wrapping layer, the inner framework layer is integrally wrapped in the outer wrapping layer, and a plurality of positions between the inner framework layer and the outer wrapping layer are tightly connected together through inner buckling structures. The valve body comprises a welding part, a first connecting end and a second connecting end are arranged at the two ends of the welding part respectively, the outer diameter of the first connecting end is smaller than that of the second connecting end, the first connecting end is used for being connected with an air return pipe, and the second connecting end is used for being connected with a carbon tank through a pipeline. A flange end used for being connected with an oil tank exhaust port is arranged on the side wall of the welding part. The valve body realizes the connection of the joint of the inner layer and the outer layer through the inner buckling structure, and has the characteristics of good forming effect and strong permeability.

Description

Technical Field

[0001] The utility model relates to the technical field of oil tank valve bodies, in particular to a double-material injection oil tank valve body with good molding effect and strong permeability. Background Art

[0002] Fuel tanks for gasoline and hybrid vehicles are typically made of metal or plastic. The latter, due to its flexible shape, is widely used in compact passenger cars. Fuel tanks are typically equipped with valves to connect pipes of varying diameters.

[0003] In order to improve the fuel penetration resistance of the valve body, the current mostly adopted technology is rubber coating. The inner layer is made of PA or other penetration-resistant materials, and the outer layer is completely wrapped with HDPE. However, there is still a gap between the two layers, and its penetration resistance effect still cannot meet the actual use requirements. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to overcome the deficiencies in the prior art, the utility model provides a double-material injection oil tank valve body with good molding effect and strong permeability.

[0005] The technical solution to be adopted by the present invention to solve its technical problems is: a double-injection fuel tank valve body, including an inner skeleton layer and an outer covering layer, the inner skeleton layer is entirely covered in the outer covering layer, and the inner skeleton layer and the outer covering layer are tightly connected together by adopting an inner buckle structure at multiple locations; the valve body includes a welding portion, and the two ends of the welding portion are respectively provided with a first connecting end and a second connecting end, and the outer diameter of the first connecting end is smaller than the outer diameter of the second connecting end, the first connecting end is used to connect to the return air pipe, and the second connecting end is used to connect to the carbon canister through a pipeline; the welding portion A flange end for connecting to the exhaust port of the fuel tank is provided on the side wall of the part; a first inward-buckled structure is provided at the junction of the inner skeleton layer and the outer covering layer of the first connecting end, and the connection is made through the first inward-buckled structure; a second inward-buckled structure is provided at the junction of the inner skeleton layer and the outer covering layer of the second connecting end, and the connection is made through the second inward-buckled structure; a third inward-buckled structure is provided at the junction of the inner skeleton layer and the outer covering layer of the flange end, and the connection is made through the third inward-buckled structure; the inner skeleton layer and the outer covering layer of the welding part are provided with a fourth inward-buckled structure, and the connection is made through the fourth inward-buckled structure.

[0006] Furthermore, the wall thickness of the outer covering layer at the welding portion is greater than the wall thickness at other positions of the outer covering layer.

[0007] Furthermore, the connection between the outer coating layer of the welding portion and the outer coating layers of the first connection end and the second connection end adopts an arc-shaped transition. When the outer coating layer is injected, it is ensured that it can completely fill the mold.

[0008] Specifically, the first inward-buckling structure includes a first inner chamfered surface provided at the end of the inner skeleton layer. When the outer covering layer is injected, the first inner chamfered surface is covered inside to form the inward-buckling structure.

[0009] Specifically, the second inward-buckling structure includes a second inner chamfered surface provided at the end of the inner skeleton layer. When the outer covering layer is injected, the second inner chamfered surface is covered inside to form the inward-buckling structure.

[0010] Specifically, the third inward-buttoning structure includes a radial protrusion arranged on the inner skeleton layer, and a hook portion is provided on the outer edge of the lower end surface of the radial protrusion. When the outer layer is injected, the radial protrusion and the hook portion are covered by the outer covering layer to form an inward-buttoning structure.

[0011] Specifically, the fourth inward-buttoning structure includes a radially outward protrusion provided on the inner skeleton layer, and a groove formed on the inner wall of the outer covering layer during injection, wherein the groove covers the protrusion to form an inward-buttoning structure.

[0012] Furthermore, a curved plate is provided on the inner frame layer of the welded portion, positioned between the first and second connecting ends, with the concave surface of the curved plate facing the first connecting end. The curved plate serves two purposes: first, it supports the inner frame layer during injection molding, ensuring its stability and ensuring good injection molding of the outer layer; second, it blocks the first and second connecting ends, preventing airflow interference between them.

[0013] Furthermore, the inner skeleton layer is made of PA material, and the outer covering layer is made of HDPE material.

[0014] The beneficial effects of the utility model are:

[0015] (1) Fully enclosed structure: This is equivalent to putting a layer of protective structure on the outside of the inner material, especially at the welding position, where the wall thickness is thicker, which can improve the overall strength and durability of the product. In the event of an emergency, it can also better protect the internal structure to prevent it from failing quickly and causing problems such as fuel tank leakage.

[0016] (2) Inner buckle structure: The inner and outer materials are tightly buckled together through their respective protrusions and depressions, which greatly enhances the overall strength; and has good sealing performance and strong resistance to oil, gas and oil leakage.

[0017] (3) The connection between different parts adopts arc surface transition, which ensures that the outer coating layer can completely fill the mold when it is injected.

[0018] (4) PA material has good fluidity and can quickly fill the mold. At the same time, its melting temperature is high and it is not easy to cool, so it can greatly avoid the occurrence of shrinkage and shrinkage problems. The inner layer is made of PA material and the outer layer is wrapped with HDPE material. The melting point of PA material is much higher than that of HDPE material. Therefore, when the outer layer is injected, the inner layer material will not be deformed due to the similar temperature, and it will not cause peeling or back-puncture problems under the action of impact. Therefore, the permeability of the valve body is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0020] Figure 1 It is a structural schematic diagram of the double-material injection fuel tank valve body of the utility model.

[0021] Figure 2 It is a structural schematic diagram of the double-material injection fuel tank valve body of the utility model.

[0022] Figure 3 It is a schematic top view of the structure of the double-material injection fuel tank valve body of the utility model.

[0023] Figure 4 yes Figure 3 Schematic diagram of the cross-sectional structure of AA.

[0024] Figure 5 It is a schematic diagram of the cross-sectional model of the double-injection fuel tank valve body.

[0025] Figure 6 yes Figure 4 Schematic diagram of the structure of the first inward-facing structure.

[0026] Figure 7 yes Figure 4 Schematic diagram of the structure of the second inward-facing structure.

[0027] Figure 8 yes Figure 4 Schematic diagram of the structure of the third inward-facing structure.

[0028] Figure 9 yes Figure 4 Schematic diagram of the structure of the fourth inward-facing structure.

[0029] In the figure: 1. Inner skeleton layer, 2. Outer covering layer, 3. Welding part, 4. First connecting end, 5. Second connecting end, 6. Flange end, 7. Arc plate, 8. First inward-facing structure, 8.1. First inner chamfered surface, 9. Second inward-facing structure, 9.1. Second inner chamfered surface, 10. Third inward-facing structure, 10.1. Radial convex edge, 10.2. Hook part, 11. Fourth inward-facing structure, 11.1. Protrusion, 11.2. Groove. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating the basic structure of the present invention only in a schematic manner. They therefore only show components relevant to the present invention, and directions and references (e.g., up, down, left, right, etc.) are intended solely to facilitate the description of features in the drawings. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the claimed subject matter is defined solely by the appended claims and their equivalents.

[0031] like Figure 1-Figure 5 As shown, the utility model is a double-material injection fuel tank valve body, including an inner skeleton layer 1 and an outer covering layer 2. The inner skeleton layer 1 is entirely covered in the outer covering layer 2, and the inner skeleton layer 1 and the outer covering layer 2 are tightly connected together at multiple locations using an inner buckle structure; the inner skeleton layer 1 is made of PA material, and the outer covering layer 2 is made of HDPE material. The valve body includes a welding part 3, and a first connecting end 4 and a second connecting end 5 are respectively provided at both ends of the welding part 3, and the outer diameter of the first connecting end 4 is smaller than the outer diameter of the second connecting end 5, the first connecting end 4 is used to connect to the return air pipe, and the second connecting end 5 is used to connect to the carbon canister through a pipeline; a flange end 6 for connecting to the exhaust port of the fuel tank is provided on the side wall of the welding part 3; a first inward-buttoning structure 8 is provided at the junction of the inner skeleton layer 1 and the outer covering layer 2 of the first connecting end 4, and the two are connected through the first inward-buttoning structure 8; a second inward-buttoning structure 9 is provided at the junction of the inner skeleton layer 1 and the outer covering layer 2 of the second connecting end 5, and the two are connected through the second inward-buttoning structure 9; a third inward-buttoning structure 10 is provided at the junction of the inner skeleton layer 1 and the outer covering layer 2 of the flange end 6, and the two are connected through the third inward-buttoning structure 10; the inner skeleton layer 1 and the outer covering layer 2 of the welding part 3 are provided with a fourth inward-buttoning structure 11, and the two are connected through the fourth inward-buttoning structure 11. The inner layer material is used to prevent oil and gas penetration, and the outer layer material is mainly responsible for welding on the fuel tank and plays a fixing role. The inner layer structure of PA material can improve the permeability of the product.

[0032] like Figure 4As shown, the wall thickness of the outer covering layer 2 at the welding part 3 is greater than the wall thickness of the outer covering layer 2 at other positions, which can improve the overall strength and durability of the product. The connection between the outer covering layer 2 of the welding part 3 and the outer covering layer 2 of the first connecting end 4 and the second connecting end 5 adopts an arc surface transition. When the outer covering layer 2 is injected, it is ensured that it can completely fill the mold. An arc plate 7 is provided on the inner skeleton layer 1 of the welding part 3, and the arc plate 7 is arranged between the first connecting end 4 and the second connecting end 5, and the concave surface of the arc plate 7 faces the side of the first connecting end 4. The arc plate 7 has two functions. On the one hand, when the outer layer is injected, the arc plate 7 serves as a support for the inner skeleton layer 1 to ensure its stability during the injection process, thereby ensuring good injection of the outer layer; on the other hand, the arc plate 7 is blocked between the first connecting end 4 and the second connecting end 5 to avoid airflow interference between the two.

[0033] like Figure 6 As shown, the first inward-buckling structure 8 includes a first inner chamfered surface 8.1 provided at the end of the inner skeleton layer 1. When the outer covering layer 2 is injected, the first inner chamfered surface 8.1 is covered inside to form an inward-buckling structure.

[0034] like Figure 7 As shown, the second inward-buckling structure 9 includes a second inner chamfered surface 9.1 provided at the end of the inner skeleton layer 1. When the outer covering layer 2 is injected, the second inner chamfered surface 9.1 is covered inside to form an inward-buckling structure.

[0035] like Figure 8 As shown, the third inward-buttoning structure 10 includes a radial flange 10.1 arranged on the inner skeleton layer 1, and a hook portion 10.2 is provided on the outer edge of the lower end surface of the radial flange 10.1. When the outer layer is injected, the radial flange 10.1 and the hook portion 10.2 are covered by the outer coating layer 2 to form an inward-buttoning structure.

[0036] like Figure 9 As shown, the fourth inward-buttoning structure 11 includes a radially outward protrusion 11.1 arranged on the inner skeleton layer 1, and a groove 11.2 formed on the inner wall of the outer coating layer 2 during injection, and the groove 11.2 covers the protrusion 11.1 to form an inward-buttoning structure.

[0037] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the scope of the present invention. The technical scope of this utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A double-injection fuel tank valve body, characterized by: It includes an inner skeleton layer and an outer covering layer, the inner skeleton layer is entirely covered in the outer covering layer, and the inner skeleton layer and the outer covering layer are tightly connected together at multiple locations using an inner-button structure; the valve body includes a welding part, and the two ends of the welding part are respectively provided with a first connecting end and a second connecting end, and the outer diameter of the first connecting end is smaller than the outer diameter of the second connecting end, the first connecting end is used to connect to the return air pipe, and the second connecting end is used to connect to the carbon canister through a pipeline; a flange end for connecting to the exhaust port of the fuel tank is provided on the side wall of the welding part; a first inner-button structure is provided at the junction of the inner skeleton layer and the outer covering layer of the first connecting end, and are connected through the first inner-button structure; a second inner-button structure is provided at the junction of the inner skeleton layer and the outer covering layer of the second connecting end, and are connected through the second inner-button structure; a third inner-button structure is provided at the junction of the inner skeleton layer and the outer covering layer of the flange end, and are connected through the third inner-button structure; the inner skeleton layer and the outer covering layer of the welding part are provided with a fourth inner-button structure, and are connected through the fourth inner-button structure.

2. The dual injection fuel tank valve body according to claim 1, characterized in that: The wall thickness of the outer covering layer at the welding portion is greater than the wall thickness at other positions of the outer covering layer.

3. The dual injection fuel tank valve body according to claim 2, characterized in that: The connection between the outer covering layer of the welding portion and the outer covering layers of the first connecting end and the second connecting end adopts an arc-shaped surface transition.

4. The dual injection fuel tank valve body according to claim 1, characterized in that: The first inward-buckling structure includes a first inner chamfered surface arranged at the end of the inner skeleton layer. When the outer covering layer is injected, the first inner chamfered surface is covered inside to form the inward-buckling structure.

5. The dual injection fuel tank valve body according to claim 1, characterized in that: The second inward-buckling structure includes a second inner chamfered surface arranged at the end of the inner skeleton layer. When the outer covering layer is injected, the second inner chamfered surface is covered inside to form the inward-buckling structure.

6. The dual injection fuel tank valve body according to claim 1, characterized in that: The third inward-buttoning structure includes a radial protrusion arranged on the inner skeleton layer, and a hook portion is provided on the outer edge of the lower end surface of the radial protrusion. When the outer layer is injected, the radial protrusion and the hook portion are covered by the outer covering layer to form an inward-buttoning structure.

7. The dual injection fuel tank valve body according to claim 1, characterized in that: The fourth inward-buckling structure includes a radially outward protrusion arranged on the inner skeleton layer, and a groove formed on the inner wall of the outer coating layer during injection, wherein the groove covers the protrusion to form an inward-buckling structure.

8. The dual injection fuel tank valve body according to claim 1, characterized in that: An arc-shaped plate is provided on the inner skeleton layer of the welding portion. The arc-shaped plate is arranged between the first connecting end and the second connecting end, and the concave surface of the arc-shaped plate faces the first connecting end.

9. The dual injection fuel tank valve body according to claim 1, characterized in that: The inner skeleton layer is made of PA material, and the outer covering layer is made of HDPE material.

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