Low-emission flange for fuel tank valve and valve

Abstract

According to the low-emission flange and the valve for the fuel tank valve, the low-emission flange is provided with the first material layer and the second material layer which are connected, and the first material layer is used for forming a fuel tank connecting structure connected to a fuel tank; the fuel tank connecting structure extends to form a valve body connecting structure, the valve body connecting structure is used for being connected to an external fuel tank valve body, and transition areas between the fuel tank connecting structure and the valve body connecting structure are all the first material layers; therefore, after the low-emission flange is installed on the external fuel tank, the first material layer is connected from the joint of the first material layer and the external fuel tank to the joint of the first material layer and the valve body of the external fuel tank, namely, no joint of the first material layer and the second material layer is exposed in an inner cavity of the external fuel tank. And therefore, oil in the fuel tank is prevented from leaking into the pipeline from the joint of the two materials.

Description

TECHNICAL FIELD

[0001] The utility model belongs to fuel system technical field especially relates to a low emission flange and valve for fuel tank valve. BACKGROUND

[0002] The release of "Guo six" standard means that the requirement of the whole fuel system's evaporation emission is more and more strict, and the requirement of fuel tank's dynamic leakage (generally including horizontal shaking test, angle overturning shaking test and six-axis shaking test etc.) is also improved, so the design of valve has certain test, no matter it is refueling limit valve or overturning valve or combination valve, because the valve is installed and fixed on the fuel tank, the valve core is communicated with the inside of fuel tank, and the pipe mouth of valve is generally connected to carbon tank through pipeline.When the vehicle appears fluctuation in the process of driving, the fuel in the fuel tank also surges, if the valve core in the valve cannot seal the exhaust passage in time, then the fuel has certain probability to pour out the exhaust passage of valve, flows out through the pipe mouth, and forms leakage phenomenon.

[0003] When the vehicle is in the working condition of fierce driving, the fuel tank shakes greatly, and the fuel surges and impacts the valve in the fuel tank.Long time fierce driving can make the valve leak a certain amount of fuel.In the prior art, the flange is usually installed on the valve, and the input pipeline of the flange is communicated to the carbon tank, the fuel tank valve and the flange are usually made of nonmetal, so part of oil does not enter the carbon tank for adsorption and utilization, but penetrates into the atmosphere from the flange, oil gas escapes, and the emission increases.

[0004] In the prior art, two materials are usually used for manufacturing, the harder material (for example, POM) is arranged to be sealingly connected to the valve body of fuel tank valve, and the softer material (for example, HDPE) is used to coat the harder material, and the output connecting pipe (used for connecting the input pipeline of carbon tank) and the welding with the fuel tank are formed by the softer material, but the prior art flange has the problem that the combination of the two materials is exposed in the inner cavity of fuel tank and the output connecting pipe of flange respectively, so the oil in the fuel tank leaks from the gap between the two materials to the inside of the output connecting pipe and finally flows to the carbon tank, the dynamic leakage of fuel tank increases, and the evaporation emission performance of the whole fuel system is affected. TECHNICAL PROBLEM

[0005] The utility model solves the technical problem that the oil leaks from the combination of two materials of the prior art fuel tank valve connecting flange, and the dynamic leakage of fuel tank increases.

[0006] To solve the above problems, the technical scheme of the utility model is as follows:

[0007] The utility model discloses a low emission flange for fuel tank valve, including:

[0008] Flange body, the flange body includes the first material layer and the second material layer of being connected,

[0009] The first material layer forms the fuel tank connecting structure for connecting to the external fuel tank and the valve body connecting structure for connecting to the external fuel tank valve valve body, wherein the transition area between the fuel tank connecting structure and the valve body connecting structure is the first material layer.

[0010] The utility model discloses a low emission flange for fuel tank valve, the first material layer is configured with gas-liquid discharge cavity and the pipe mouth connecting structure and the valve body connecting structure at both ends of the gas-liquid discharge cavity,

[0011] Second material layer, arrange in the inner chamber surface of at least partial gas-liquid discharge cavity, and the joint formed between the second material layer and the first material layer is all located in the gas-liquid discharge cavity.

[0012] The utility model discloses a low emission flange for fuel tank valve, the first material layer includes flange main part, the pipe mouth connecting structure extends in the side of flange main part, and the valve body connecting structure extends in the lower end of flange main part,

[0013] At least partial outer lateral wall surface of the pipe mouth connecting structure is configured as the extension and sealed connection to the external pipeline, and at least partial inner lateral wall surface of the valve body connecting structure is configured as the sleeve and sealed connection to the external fuel tank valve valve body.

[0014] The utility model discloses a low emission flange for fuel tank valve, at least one first structure reinforcing groove is equipped in the valve body connecting structure, and the second material layer is arranged in the first structure reinforcing groove.

[0015] The utility model discloses a low emission flange for fuel tank valve, the valve body connecting structure is annular connecting structure, and the first structure reinforcing groove is annular recessed groove in the annular connecting structure.

[0016] The utility model discloses a low emission flange for fuel tank valve, the pipe mouth connecting structure includes the intermediate pipe section and the connecting pipe section of arranging in sequence along the direction away from the flange main part, and the outer pipe surface of connecting pipe section is equipped with a plurality of annular protrusions.

[0017] The utility model discloses a low emission flange for fuel tank valve, the second material layer is arranged in the inner pipe surface of the intermediate pipe section and at least partial inner pipe surface of the connecting pipe section.

[0018] The utility model discloses a low emission flange for fuel tank valve, and the first material layer is plastic formed in the second material layer.

[0019] The first material layer and the second material layer are not chemically connected.

[0020] The valve comprises the low-emission flange for the fuel tank valve.

[0021] Compared with the prior art, the low-emission flange for the fuel tank valve has the following advantages and positive effects:

[0022] 1. In the embodiment, the low-emission flange is provided with the first material layer and the second material layer which are connected, the first material layer is used to form a fuel tank connecting structure connected to the fuel tank, the first material layer is further provided with a valve body connecting structure extended from the fuel tank connecting structure, the valve body connecting structure is used to be connected to an external fuel tank valve body, and the transition area between the fuel tank connecting structure and the valve body connecting structure is the first material layer, so that the first material layer of the low-emission flange is connected from the connection between the low-emission flange and the external fuel tank to the connection between the low-emission flange and the external fuel tank valve body after the low-emission flange is installed to the external fuel tank, that is, there is no joint between the first material layer and the second material layer exposed to the inner cavity of the external fuel tank, so that the oil in the fuel tank is prevented from leaking to the inside of the pipeline through the joint between the two materials, the dynamic leakage of the fuel tank is effectively controlled, and the overall evaporation emission performance of the fuel system is good.

[0023] 2. In the embodiment, the first material layer is further provided with a gas-liquid discharge cavity and a pipe opening connecting structure used to connect an external pipeline, that is, the main structure of the low-emission flange is formed by the first material layer, the second material layer is further provided on the inner cavity surface of the gas-liquid discharge cavity, the second material layer is combined with the first material layer to improve the overall structural strength of the formed low-emission flange, and the joint between the two material layers is located in the gas-liquid discharge cavity formed by the first material layer, that is, the oil entering the gas-liquid discharge cavity from the fuel tank valve will not leak from the joint between the two material layers, and the gas emission pollution caused by the leakage of gas from the joint is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0024] Fig. 1 FIG. 1 is a schematic view of the low-emission flange for the fuel tank valve of the utility model installed on a fuel tank valve body;

[0025] Fig. 2 FIG. 2 is a sectional view of the low-emission flange for the fuel tank valve of the utility model;

[0026] Fig. 3 FIG. 3 is a schematic view of the low-emission flange for the fuel tank valve of the utility model;

[0027] Fig. 4 The utility model discloses a schematic view for low emission flange for fuel tank valve is installed to fuel tank.

[0028] Mark explanation: 1, first material layer, 101, valve body connecting structure, 1011, first structure reinforcing groove, 102, fuel tank connecting structure, 103, transition area, 104, flange main part, 1041, second structure reinforcing groove, 105, pipe mouth connecting structure, 1051, intermediate pipe section, 1052, connecting pipe section, 2, second material layer, 3, external fuel tank valve valve body, 4, external fuel tank. DETAILED DESCRIPTION

[0029] The utility model discloses a low emission flange for fuel tank valve and valve further in detail below combining with the drawings and specific embodiment are proposed, and the advantages and features of the utility model will be more clear according to the following description and claims.

[0030] Example one

[0031] Reference Figs. 1 to 4 In one embodiment, a low emission flange for fuel tank valve, comprising a flange body, the flange body comprises connected first material layer 1 and second material layer 2.

[0032] The first material layer 1 forms the fuel tank connecting structure 102 for connecting to the external fuel tank 4 and the valve body connecting structure 101 for connecting to the external fuel tank valve valve body 3. Wherein, the transition area 103 between the fuel tank connecting structure 102 and the valve body connecting structure 101 is the first material layer 1.

[0033] The embodiment is by the low emission flange that is connected first material layer 1 and second material layer 2, first material layer 1 is used to form the fuel tank connecting structure 102 connected to the fuel tank, and further first material layer 1 is arranged to be extended from the fuel tank connecting structure 102 and form the valve body connecting structure 101, the valve body connecting structure 101 is used to connect to the external fuel tank valve valve body 3, and the transition area 103 between the fuel tank connecting structure 102 and the valve body connecting structure 101 is the first material layer 1, to make the low emission flange of the embodiment after being installed to the external fuel tank 4, first material layer 1 is coherent from its connection with the external fuel tank 4 to its connection with the external fuel tank valve valve body 3, that is, any first material layer 1 and second material layer 2 joint are not exposed to the inner cavity of the external fuel tank 4, to avoid the oil in the fuel tank from the joint of two materials to leak to the inside of the pipeline, effectively control the dynamic leakage of fuel tank, and the overall evaporation emission performance of fuel system is good.

[0034] The specific structure of the low emission flange for fuel tank valve of the embodiment is further described as follows:

[0035] In the embodiment, the first material layer 1 is configured to have a gas-liquid discharge cavity and the pipe connection structure 105 and the valve body connection structure 101 at both ends of the gas-liquid discharge cavity. The second material layer 2 is arranged on the inner cavity surface of at least part of the gas-liquid discharge cavity, and the joint between the first material layer 1 and the second material layer 2 is located in the gas-liquid discharge cavity.

[0036] By setting the first material layer 1 to further have a gas-liquid discharge cavity and a pipe connection structure 105 for connecting external pipelines, that is, forming the main structure of the low-emission flange by the first material layer 1, and further arranging the second material layer 2 on the inner cavity surface of the gas-liquid discharge cavity, the second material layer 2 is combined with the first material layer 1 to improve the overall structural strength of the formed low-emission flange, and the joint between the two material layers is located in the gas-liquid discharge cavity formed by the first material layer 1, that is, the oil entering the gas-liquid discharge cavity from the fuel tank valve will not leak from the joint between the two material layers, reducing the gas emission pollution caused by gas leakage from the joint.

[0037] In the embodiment, the first material layer 1 can specifically include a flange body 104, the pipe connection structure 105 extends on the side surface of the flange body 104, and the valve body connection structure 101 extends on the lower end of the flange body 104. Among them, at least part of the outer side wall surface of the pipe connection structure 105 is configured to extend into and be sealingly connected to the external pipeline, and at least part of the inner side wall surface of the valve body connection structure 101 is configured to be sleeved and sealingly connected to the external fuel tank valve body 3.

[0038] Further, the fuel tank connection structure 102 can be specifically an annular skirt extending downward from the lower end of the flange body 104, which surrounds the valve body connection structure 101.

[0039] Further, since the first material layer 1 is used to be connected to the external fuel tank 4 (usually welded), the hardness of the first material layer 1 is low, and the oil gas evaporation emission performance is poor, and the second material layer 2 is arranged in the first material layer 1, which serves to enhance the overall structural strength of the flange and reduce the oil gas evaporation emission of the overall flange by using the good oil gas evaporation emission performance. Based on this, and part of the valve body connection structure 101 needs a certain structural strength to ensure the sealing connection between the fuel tank valve body, the valve body connection structure 101 of the embodiment can be provided with at least one first structure reinforcing groove 1011, and the second material layer 2 is arranged in the first structure reinforcing groove 1011, that is, the second material layer 2 extends into the first structure reinforcing groove 1011 to increase the structural strength of the part of the valve body connection structure 101.

[0040] Specifically, the valve body connecting structure 101 can be an annular connecting structure, the first structure reinforcing groove 1011 is an annular recessed groove in the annular connecting structure, and the second material layer 2 extends into the annular recessed groove to form a structure reinforcing ring, which facilitates molding.

[0041] In the embodiment, the pipe connecting structure 105 includes an intermediate pipe segment 1051 and a connecting pipe segment 1052 arranged in sequence in a direction away from the flange body 104, and the outer pipe surface of the connecting pipe segment 1052 is provided with a plurality of annular protrusions, which can be specifically configured as a bamboo joint structure.

[0042] Further, in order to improve the strength of the pipe connecting structure 105, the second material layer 2 can also be arranged on the inner pipe surface of the intermediate pipe segment 1051 and at least part of the inner pipe surface of the connecting pipe segment 1052.

[0043] In the embodiment, in order to further improve the structural strength of the flange body 104 part, a plurality of second structure reinforcing grooves 1041 can also be further arranged in the gas-liquid discharge cavity of the flange body 104, which are filled with the second material layer 2 to improve the material strength, for example, another annular recessed groove can be arranged around the above-mentioned first structure reinforcing groove 1011 and located in the fuel tank connecting structure 102.

[0044] Further, a corresponding recessed groove can also be arranged at the fuel tank connecting structure 102 (annular skirt), which is filled with the second material layer 2 to improve the material strength.

[0045] In the embodiment, the first material layer 1 is over-molded on the second material layer 2, that is, the second material layer 2 is first one-time injection molded, and then the first material layer 1 is two-time injection molded on the basis of the molded second material layer 2.

[0046] In the embodiment, the material of the first material layer 1 and the material of the second material layer 2 do not chemically connect, specifically, the material of the first material layer 1 can be HDPE, and the material of the second material layer 2 can be POM. In other embodiments, the materials of the first material layer 1 and the second material layer 2 can also be other materials, as long as they do not chemically connect.

[0047] Embodiment Two

[0048] The embodiment provides a valve, comprising the low emission flange for the fuel tank valve in the first embodiment. By setting the low emission flange as the first material layer 1 and the second material layer 2 connected, the first material layer 1 is used to form the fuel tank connecting structure 102 connected to the fuel tank, and the first material layer 1 is further set to extend from the fuel tank connecting structure 102 and form the valve body connecting structure 101 used to be connected to the external fuel tank valve valve body 3, and the transition area 103 between the fuel tank connecting structure 102 and the valve body connecting structure 101 is the first material layer 1, so that the low emission flange of the embodiment is connected from the connection with the external fuel tank 4 to the connection with the external fuel tank valve valve body 3 after being installed to the external fuel tank 4, that is, there is no joint of the first material layer 1 and the second material layer 2 exposed to the inner cavity of the external fuel tank 4, so that the oil in the fuel tank is prevented from leaking to the pipeline inside from the joint of the two materials, the dynamic leakage of the fuel tank is effectively controlled, and the overall evaporative emission performance of the fuel system is good.

[0049] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments. Even if various changes are made to the utility model, if the changes belong to the scope of the utility model claims and equivalent technologies, they still fall within the protection scope of the utility model.

Claims

1. A low emission flange for a fuel tank valve, characterized in that, The flange body comprises a first material layer and a second material layer connected together. The first material layer forms a fuel tank connecting structure for connecting to an external fuel tank and a valve body connecting structure for connecting to an external fuel tank valve valve body; wherein the transition area between the fuel tank connecting structure and the valve body connecting structure is the first material layer. The first material layer is configured to have a gas-liquid discharge cavity and a pipe connecting structure and the valve body connecting structure at both ends of the gas-liquid discharge cavity.

2. A low emission flange for a fuel tank valve as defined in claim 1, wherein, The second material layer is arranged on the inner cavity surface of at least part of the gas-liquid discharge cavity, and the joint formed between the second material layer and the first material layer is located in the gas-liquid discharge cavity. The first material layer comprises a flange body, the pipe connecting structure extends from the side surface of the flange body, and the valve body connecting structure extends from the lower end of the flange body.

3. A low emission flange for a fuel tank valve as defined in claim 2, wherein, At least part of the outer side wall surface of the pipe connecting structure is configured to extend into and be sealingly connected to an external pipeline, and at least part of the inner side wall surface of the valve body connecting structure is configured to be sleeved and sealingly connected to an external fuel tank valve valve body. The valve body connecting structure is provided with at least one first structure reinforcing groove, and the second material layer is arranged in the first structure reinforcing groove.

4. A low emission flange for a fuel tank valve as defined in claim 1, wherein, The valve body connecting structure is an annular connecting structure, and the first structure reinforcing groove is an annular recess in the annular connecting structure.

5. A low emission flange for a fuel tank valve as defined in claim 4, wherein, The pipe connecting structure comprises a middle pipe section and a connecting pipe section arranged in sequence away from the flange body, and the outer pipe surface of the connecting pipe section is provided with a plurality of annular protrusions.

6. A low emission flange for a fuel tank valve as defined in claim 3, wherein, The second material layer is arranged on the inner pipe surface of the middle pipe section and at least part of the inner pipe surface of the connecting pipe section.

7. A low emission flange for a fuel tank valve as defined in claim 6, wherein, The first material layer is overmolded on the second material layer.

8. A low emission flange for a fuel tank valve as defined in claim 1, wherein, The material of the first material layer and the material of the second material layer do not chemically connect.

9. A low emission flange for a fuel tank valve as defined in claim 1, wherein, A low-emission flange for a fuel tank valve comprising any one of claims 1 to 9.

10. A valve characterized by, ​

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