A refueling hose that meets low emission requirements

Abstract

This utility model discloses a refueling hose designed to meet low emission requirements, comprising a metal main refueling pipe and a metal circulation pipe. One end of the metal circulation pipe is connected to the inlet end of the metal main refueling pipe. The metal main refueling pipe includes a metal bent pipe, a metal corrugated pipe, and a metal connecting pipe connected in sequence. The end of the metal connecting pipe is connected to one end of a quick-connect fitting, and the other end of the quick-connect fitting is connected to an ICV valve. The ICV valve includes a welded frustum and a tubular valve body extending into the quick-connect fitting. A convex ring is provided on the outer periphery of the tubular valve body. The quick-connect fitting includes a locking head and a locking spring. The locking spring is movably connected to the locking head to lock the convex ring within the locking head. Several sealing rings are provided between the tubular valve body and the quick-connect fitting, and sealing rings are provided between the quick-connect fitting and the metal connecting pipe. This utility model has the advantages of high sealing performance, resistance to vibration fatigue, and long service life.

Description

Technical Field

[0001] This utility model belongs to the field of refueling pipe technology, and specifically relates to a refueling pipe that meets low emission requirements. Background Technology

[0002] As global emphasis on environmental protection and carbon emission control continues to rise, standards for controlling vehicle exhaust emissions and fuel evaporative emissions are becoming increasingly stringent. my country's upcoming "National VII" emission standards (hereinafter referred to as "National VII") impose even stricter requirements on fuel system evaporative emissions. In the refueling system of gasoline vehicles, the refueling hose, as a crucial path connecting the fuel tank and the refueling port, directly affects the overall vehicle's evaporative emission levels through its sealing performance and structural reliability.

[0003] Traditional fuel hoses are mostly made of rubber or plastic, which have a certain degree of flexibility, but their resistance to high temperatures, UV aging, and fuel corrosion is limited. After long-term use, the hose is prone to cracking, hardening, or local expansion due to material deterioration, leading to leakage of the hose itself. At the same time, the connection between the hose and the metal joint (such as the clamp fixing point) is prone to stress relaxation under temperature cycling due to the difference in the coefficient of thermal expansion of the materials, ultimately causing interface leakage. Utility Model Content

[0004] The purpose of this utility model is to provide a refueling pipe that meets low emission requirements, featuring a refueling pipe structure that combines high sealing performance, resistance to vibration fatigue, and long service life, in order to support the implementation of the China VII emission regulations.

[0005] The purpose of this utility model is achieved as follows: a refueling pipe for meeting low emission requirements, comprising a metal refueling main pipe and a metal circulation pipe, one end of which is connected to the oil inlet end of the metal refueling main pipe. The metal refueling main pipe comprises a metal bent pipe, a metal corrugated pipe, and a metal connecting pipe connected in sequence. The end of the metal connecting pipe is connected to one end of a quick-connect fitting, and the other end of the quick-connect fitting is connected to an ICV valve. The ICV valve comprises a welded frustum and a tubular valve body extending into the quick-connect fitting. A convex ring is provided on the outer periphery of the tubular valve body. The quick-connect fitting comprises a locking head and a locking spring. The locking spring is movably connected to the locking head to lock the convex ring within the locking head. A plurality of sealing rings (first type) are provided between the tubular valve body and the quick-connect fitting, and sealing rings (second type) are provided between the quick-connect fitting and the metal connecting pipe.

[0006] When in use, the metal bellows has good flexibility, which can absorb and buffer vibrations and impacts during vehicle operation, reducing the risk of loosening of connections and sealing failures caused by vibration. The combination of the rigid structure of the metal bent pipe and metal connecting pipe with the flexibility of the metal bellows ensures that the refueling pipe can maintain overall stability while adapting to various deformations. The movable connection between the locking spring and the locking head ensures that the convex ring is always locked in the locking head, preventing the ICV valve and quick connector from separating due to vibration, further ensuring the overall sealing of the refueling pipe. At the same time, sealing ring one and sealing ring two form multiple sealing lines at the pipe connection, which can effectively prevent fuel from leaking from the interface during transmission. In addition, sealing ring one and sealing ring two can further enhance the sealing effect under refueling pressure, ensuring that all fuel enters the fuel tank and preventing fuel vapor from escaping into the atmosphere. After the ICV valve is closed, it can prevent fuel vapor in the fuel tank from leaking to the outside through the refueling pipe.

[0007] Compared with the prior art, the beneficial effects of this utility model are as follows: the metal bending pipe, corrugated pipe and connecting pipe are all made of metal materials, which can meet the flexibility requirements during assembly. Compared with traditional rubber / plastic hoses, they have better high temperature resistance, corrosion resistance and aging resistance. Long-term use is not prone to cracking or deformation due to material deterioration, which fundamentally reduces the risk of leakage caused by material aging. The quick-connect coupling can realize the rapid assembly of the ICV valve through the movable connection of the locking spring and the locking head, which improves the production cycle. Through sealing ring one and sealing ring two, two sealing barriers are formed: "valve body-connector" and "connector-main pipe". Even if a sealing point fails due to abnormal wear, the other seal can still prevent fuel / vapor leakage, meeting the strict standards of high sealing performance in low emission regulations.

[0008] As a further improvement of this utility model, the lock head includes a lock body, several annular protrusions and a tubular connector on the same axis, the lock spring is slidably connected to the lock body, the protruding ring is located in the lock body, and the tubular valve body passes through the lock body and several annular protrusions and abuts against the end face of the tubular connector.

[0009] As a further improvement of this utility model, the metal connecting pipe includes an integrally connected connecting section, a sealing section, a snap-fit ​​section, and a flared section.

[0010] As a further improvement of this utility model, the connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the snap-fit ​​section is provided with several buckles on its outer periphery, the tubular joint is provided with several slots on its outer periphery, the buckles are tightly fastened to the corresponding slots, and the flared section is sleeved on the outside of the tubular joint.

[0011] As a further improvement of this utility model, the connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the snap-fit ​​section is provided with several buckles on the outer periphery, the tubular joint is provided with several slots on the outer periphery, the buckles are tightly fastened to the corresponding slots, and the flared section is close to or closely attached to the adjacent annular protrusion.

[0012] As a further improvement of this utility model, the connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the outer periphery of the snap-fit ​​section is provided with several buckles, a groove is provided between two adjacent annular protrusions, the several buckles are tightly fastened to the groove, and the flared section is close to or close to the lock body.

[0013] As a further improvement of this utility model, the lock spring includes an arc-shaped body. The lower side of the arc-shaped body is provided with two short hooks and two long hooks that are symmetrically distributed. The lock body has a first groove for the short hooks to pass through and a second groove for the long hooks to pass through in a direction perpendicular to its own axis. The lock body has a fixing groove at the end of the first groove and a limit block at the end of the second groove. The short hooks are engaged with the fixing groove and the long hooks are engaged with the limit block.

[0014] As a further improvement of this utility model, the inner wall of the annular protrusion is provided with a sealing groove, the sealing ring is disposed in the sealing groove, and the outer periphery of the tubular joint is provided with a sealing groove, the sealing ring is disposed in the sealing groove.

[0015] As a further improvement of this utility model, the metal refueling main pipe also includes a metal flange and a metal cup. The metal flange is disposed on the outside of the end of the metal bent pipe, and the metal cup is fixedly connected to the end of the metal bent pipe. Rubber gaskets are provided at the connection between the metal flange and the metal bent pipe and at the connection between the metal bent pipe and the metal cup.

[0016] As a further improvement of this utility model, it also includes several metal supports, and the metal circulation pipe is connected to the metal bending pipe as a whole through several metal supports. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model.

[0018] Figure 2 This is a front view of the quick-connect connector connection point in Embodiment 1 of this utility model.

[0019] Figure 3 This is a cross-sectional view of the quick-connect connector connection in Embodiment 1 of this utility model.

[0020] Figure 4 This is a top view of the lock head in Embodiment 1 of this utility model.

[0021] Figure 5 This is a three-dimensional structural diagram of the locking spring in Embodiment 1 of this utility model.

[0022] Figure 6 This is a cross-sectional view of the quick-connect connector connection in Embodiment 2 of this utility model.

[0023] Figure 7 This is a cross-sectional view of the quick-connect connector connection in Embodiment 3 of this utility model.

[0024] Among them, 1 is a metal circulation pipe, 2 is a metal bracket, 3 is a metal cup, 4 is a metal bent pipe, 5 is a metal bellows, 6 is a metal connecting pipe, 601 is a connecting section, 602 is a sealing section, 603 is a snap-fit ​​section, 603a is a snap fastener, 604 is a flared section, 7 is a metal flange, 8 is a rubber gasket, 9 is an ICV valve, 901 is a welded frustum, 902 is a tubular valve body, 903 is a raised ring, 10 is a quick-connect fitting, 1001 is a lock head, 1001a is a lock body, 1001b is an annular protrusion, 1001c is a tubular fitting, 1001d is a slide groove one, 1001e is a slide groove two, 1001f is a fixing groove, 1001g is a limiting block, 1001h is a slot, 1002 is a locking spring, 1002a is an arc-shaped body, 1002b is a short hook, 1002c is a long hook, 11 is a sealing ring one, 12 is a sealing ring two, and 13 is a groove. Detailed Implementation Example 1

[0025] like Figure 1-2 As shown, a refueling hose designed to meet low emission requirements includes a main metal refueling pipe, a metal circulation pipe 1, and three metal supports 2. The main metal refueling pipe includes a metal cup 3, a metal bent pipe 4, a metal bellows pipe 5, and a metal connecting pipe 6 connected sequentially along the oil inlet direction. One end of the metal circulation pipe 1 is connected to the oil inlet end of the main metal refueling pipe and is integrated with the metal bent pipe 4 via the three metal supports 2. A metal flange 7 is welded to the outside of the oil inlet end of the metal bent pipe 4. At the connection between the metal flange 7 and the metal bent pipe 4, a metal... A rubber pad 8 is provided at the connection between the bent tube 4 and the metal cup 3; the oil outlet end of the metal connecting tube 6 is connected to one end of the plastic quick connector 10, and the other end of the plastic quick connector 10 is connected to the ICV valve 9; the ICV valve 9 includes a welded frustum 901 and a tubular valve body 902 extending into the quick connector 10, and a protruding ring 903 is provided on the outer periphery of the tubular valve body 902; the quick connector 10 includes a locking head 1001 and a locking spring 1002, and the locking spring 1002 is movably connected to the locking head 1001 to lock the protruding ring 903 in the locking head 1001.

[0026] like Figure 3-5As shown, the lock head 1001 includes a lock body 1001a, two annular protrusions 1001b, and a tubular connector 1001c, all on the same axis. A lock spring 1002 is slidably connected to the lock body 1001a. A convex ring 903 is located inside the lock body 1001a. A tubular valve body 902 passes through the lock body 1001a and the two annular protrusions 1001b and abuts against the end face of the tubular connector 1001c. The metal connecting pipe 6 includes an integrally connected connecting section 601, a sealing section 602, a snap-fit ​​section 603, and a flared section 604. The lock spring 1002 includes an arc-shaped body 1002a, with a lower part of the arc-shaped body 1002a... The lock body 1001a has two symmetrically distributed short hooks 1002b and two symmetrically distributed long hooks 1002c. The lock body 1001a has a first groove 1001d that allows the short hooks 1002b to pass through and a second groove 1001e that allows the long hooks 1002c to pass through in a direction perpendicular to its own axis. The lock body 1001a has a fixing groove 1001f at the end of the first groove 1001d and a limit block 1001g at the end of the second groove 1001e. The short hooks 1002b are engaged with the fixing groove 1001f and the long hooks 1002c are engaged with the limit block 1001g.

[0027] To provide dual protection at critical connection points and improve sealing performance to meet low-emission leakage control requirements, two sealing rings 11 are provided between the tubular valve body 902 and the quick-connect fitting 10, and a sealing ring 12 is provided between the quick-connect fitting 10 and the metal connecting pipe 6; a sealing groove 1 is provided on the inner wall of the annular protrusion 1001b, and the sealing ring 11 is placed in the sealing groove 1; a sealing groove 2 is provided on the outer periphery of the tubular fitting 1001c, and the sealing ring 12 is placed in the sealing groove 2.

[0028] In this embodiment, the connecting section 601 is welded to the inner wall of the welded metal corrugated pipe 5, the sealing section 602 is sleeved on the outside of the tubular joint 1001c, the snap-fit ​​section 603 is provided with four snap buckles 603a on its outer periphery, the tubular joint 1001c is provided with four slots 1001h on its outer periphery, the snap buckles 603a are tightly fastened to the corresponding slots 1001h, and the flared section 604 is sleeved on the outside of the tubular joint 1001c. Example 2

[0029] The difference between this embodiment and Embodiment 1 is that the flared section 604 is close to or in close contact with the adjacent annular protrusion 1001b. Example 3

[0030] The difference between this embodiment and embodiment one is that: the connecting section 601 is welded to the inner wall of the welded metal bellows 5, the sealing section 602 is sleeved on the outside of the tubular joint 1001c, the snap-fit ​​section 603 has four snaps 603a on its outer periphery, the groove 13 is provided between two adjacent annular protrusions 1001b, the four snaps 603a are tightly fastened to the groove 13, and the flared section 604 is close to or tightly attached to the lock body 1001a.

[0031] In use, the connecting section 601 is welded to the metal bellows 5, bearing the vibration and deformation transmission from the bellows and avoiding direct stress on the subsequent snap-fit / sealing parts; the sealing section 602 is sleeved on the outside of the tubular joint 1001c, and achieves radial sealing through interference fit or compression deformation with the sealing ring 12, concentrating the sealing function in this section and reducing the sealing pressure in other parts; the snap-fit ​​section 603 is provided with four snaps 603a that are tightly engaged with the slots 1001h of the tubular joint 1001c, providing axial constraint through mechanical snap-fit ​​to ensure the axial positioning of the connecting section 601 and the tubular joint 1001c; the folded edge of the flared section 604 can provide clear axial guidance for the insertion of the tubular joint 1001c, avoiding misalignment of the snaps 603a or damage to the sealing ring caused by oblique insertion, and reducing assembly difficulty.

[0032] The advantages of this utility model are as follows: the installation and sealing method of the ICV valve 9 are optimized by the structure of the welded frustum 901 and the tubular valve body 902. The welded frustum 901 enhances the connection strength between the valve body and the oil tank, reducing the risk of leakage at the weld. The structure of the tubular valve body 902 extending into the quick-connect fitting 10, combined with the locking of the convex ring 903 and the locking spring 1002, makes the connection between the valve body and the quick-connect fitting 10 tighter. Combined with the sealing ring 11, the sealing performance between the valve body and the fitting is further improved, avoiding leakage caused by valve operation or vibration. The convex ring 903 on the outer periphery of the tubular valve body 902 and the locking spring 1002 of the quick-connect fitting 10 are precisely matched, which not only ensures the consistency of the valve body insertion depth, avoiding insufficient compression of the sealing ring due to shallow valve body insertion, but also enhances the interface contact pressure through the radial compression of the convex ring 903 by the locking spring 1002, further improving the sealing reliability.

[0033] This utility model is not limited to the above embodiments. Based on the technical solutions disclosed in this utility model, those skilled in the art can make some substitutions and modifications to some of the technical features without creative labor, and these substitutions and modifications are all within the protection scope of this utility model.

Claims

1. A refueling pipe for meeting low emission requirements, comprising a metal refueling main pipe and a metal circulation pipe, wherein one end of the metal circulation pipe is connected to the inlet end of the metal refueling main pipe, characterized in that, The metal refueling main pipe includes a metal bent pipe, a metal corrugated pipe, and a metal connecting pipe connected in sequence. One end of the metal connecting pipe is connected to one end of a quick-connect fitting, and the other end of the quick-connect fitting is connected to an ICV valve. The ICV valve includes a welded frustum and a tubular valve body extending into the quick-connect fitting. A convex ring is provided on the outer periphery of the tubular valve body. The quick-connect fitting includes a locking head and a locking spring. The locking spring is movably connected to the locking head and is used to lock the convex ring in the locking head. Several sealing rings are provided between the tubular valve body and the quick-connect fitting, and sealing rings are provided between the quick-connect fitting and the metal connecting pipe.

2. A filler pipe to meet low emission requirements according to claim 1, characterized in that The lock head includes a lock body on the same axis, several annular protrusions and a tubular connector. The lock spring is slidably connected to the lock body. The protruding ring is located inside the lock body. The tubular valve body passes through the lock body and several annular protrusions and abuts against the end face of the tubular connector.

3. A filler pipe to meet low emission requirements according to claim 2, characterized in that The metal connecting pipe includes an integrally connected connecting section, a sealing section, a snap-fit ​​section, and a flared section.

4. A filler pipe to meet low emission requirements according to claim 3, characterized in that The connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the snap-fit ​​section has several buckles on its outer periphery, the tubular joint has several slots on its outer periphery, the buckles are tightly fastened to the corresponding slots, and the flared section is sleeved on the outside of the tubular joint.

5. A filler pipe to meet low emission requirements according to claim 3, characterized in that The connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the snap-fit ​​section has several buckles on its outer periphery, the tubular joint has several slots on its outer periphery, the buckles are tightly fastened to the corresponding slots, and the flared section is close to or abuts the adjacent annular protrusion.

6. A refueling hose for meeting low emission requirements according to claim 3, characterized in that, The connecting section is fixedly connected to the metal corrugated pipe, the sealing section is sleeved on the outside of the tubular joint, the snap-fit ​​section has several buckles on its outer periphery, a groove is provided between two adjacent annular protrusions, the buckles are tightly engaged with the groove, and the flared section is close to or close to the lock body.

7. A fuel filler pipe for meeting low emission requirements according to claim 1, characterized in that The locking spring includes an arc-shaped body. Two short hooks and two long hooks are symmetrically distributed on the lower side of the arc-shaped body. The lock body has a first groove for the short hooks to pass through and a second groove for the long hooks to pass through in a direction perpendicular to its own axis. The lock body has a fixing groove at the end of the first groove and a limit block at the end of the second groove. The short hooks are engaged with the fixing groove and the long hooks are engaged with the limit block.

8. A fuel filler pipe for meeting low emission requirements according to claim 2, characterized in that The inner wall of the annular protrusion is provided with a sealing groove, and the sealing ring is disposed in the sealing groove. The outer periphery of the tubular joint is provided with a sealing groove, and the sealing ring is disposed in the sealing groove.

9. A fuel filler pipe for meeting low emission requirements according to claim 1, characterized in that The metal refueling main pipe also includes a metal flange and a metal cup. The metal flange is located on the outside of the end of the metal bent pipe, and the metal cup is fixedly connected to the end of the metal bent pipe. Rubber gaskets are provided at the connection between the metal flange and the metal bent pipe, and at the connection between the metal bent pipe and the metal cup.

10. A filler pipe to meet low emission requirements according to claim 2, characterized in that It also includes several metal supports, and the metal circulation pipe is connected to the metal bending pipe as a whole through several metal supports.

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