Double-wall fuel pipe sealing structure

Abstract

The utility model discloses a double-wall fuel pipe sealing structure which comprises an inner-layer wall pipe and an outer-layer wall pipe, the outer-layer wall pipe is connected to the outer side face of the inner-layer wall pipe in a sleeved mode, a notch pipe sleeve is arranged at the connecting position of the inner-layer wall pipe and the outer-layer wall pipe, one end of the inner-layer wall pipe is communicated with a fuel conveying channel of a fuel injector, and the other end of the inner-layer wall pipe is communicated with the outer-layer wall pipe. A clamping sleeve is arranged between the fuel injector and the inner-layer wall pipe, a sealing pipe connector is connected between the outer-layer wall pipe and the outer side face of the fuel injector in a sealed mode, according to the double-wall fuel pipe sealing structure, when the situation that sealing of the inner-layer pipeline fails due to part faults occurs, fuel cannot leak, and the safety of fuel conveying is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of engine fuel delivery, in particular to a double-wall fuel pipe sealing structure. Background Art

[0002] A double-wall structure is usually used for marine engine fuel supply pipelines, mainly to prevent fuel leakage. However, when a component failure causes the inner pipeline seal to fail, the fuel will leak from the connection between the inner pipeline and the fuel injector, causing a safety accident. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the existing defects and provide a double-wall fuel pipe sealing structure. When a component failure causes the inner pipe seal to fail, the fuel will not leak, which can effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a double-wall fuel pipe sealing structure, comprising an inner wall tube and an outer wall tube, the outer wall tube being sleeved on the outer side surface of the inner wall tube, a notched pipe sleeve being arranged between the connection between the inner wall tube and the outer wall tube, one end of the inner wall tube being connected to the fuel delivery channel of a fuel injector, a ferrule being arranged between the fuel injector and the inner wall tube, and a sealed pipe joint being sealed between the outer wall tube and the outer side surface of the fuel injector.

[0005] As a preferred technical solution of the utility model, a notch is provided on the notch pipe sleeve.

[0006] As a preferred technical solution of the utility model, the notched tube sleeve is interference fit with the inner wall tube and the outer wall tube.

[0007] As a preferred technical solution of the utility model, the interior of the sealing pipe joint is provided with an outer wall tube sealing section, a ferrule clamping boss section, a threaded section and a fuel injector outer wall sealing section in sequence, the inner side surfaces of the outer wall tube sealing section and the fuel injector outer wall sealing section are both provided with sealing ring grooves, and the two sealing ring grooves are respectively provided with a first sealing ring and a second sealing ring for achieving sealing between the sealing pipe joint and the outer wall tube and the fuel injector, the inner side surface of the ferrule clamping boss section is provided with a boss for clamping the ferrule, and the threaded section is threadedly connected to the external thread on the fuel injector.

[0008] As a preferred technical solution of the utility model, a 30° notch is formed on the boss in the clamping boss section.

[0009] Compared with the prior art, the beneficial effects of the utility model are as follows: the sealing structure of the double-wall fuel pipe is reasonably designed and ingeniously conceived. By arranging a notched pipe sleeve between the inner wall pipe and the outer wall pipe, the sealing of the inner wall pipe is achieved. By arranging a sealed pipe connection between the outer wall pipe and the fuel injector, if a component failure causes the sealing of the inner layer pipeline to fail, the fuel can be stored in the chamber between the inner and outer layer pipelines to achieve sealing, thereby greatly improving the safety of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a schematic diagram of the structure of the utility model;

[0011] Figure 2 It is a structural schematic diagram of a notched pipe sleeve;

[0012] Figure 3 It is a structural schematic diagram of a sealed pipe joint;

[0013] Figure 4 for Figure 3 Top view of the .

[0014] In the figure: 1 inner wall tube, 2 outer wall tube, 3 fuel injector, 4 notched tube sleeve, 5 sealed pipe joint, 51 outer wall tube sealing section, 52 ferrule pressing boss section, 53 threaded section, 54 fuel injector outer wall sealing section, 6 ferrule, 7 first sealing ring, 8 second sealing ring. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments (for the convenience of description and understanding, the following is a schematic diagram of the present invention). Figure 1 Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0016] See also Figure 1-4 The utility model provides a technical solution: a double-wall fuel pipe sealing structure, including an inner wall tube 1 and an outer wall tube 2, the outer wall tube 2 is sleeved on the outer side of the inner wall tube 1, a notched tube sleeve 4 is arranged between the connection between the inner wall tube 1 and the outer wall tube 2, the notched tube sleeve 4 and the inner wall tube 1 and the outer wall tube 2 are all interference fit, which can ensure the sealing between the inner wall tube 1 and the outer wall tube 2, and at the same time ensure that the inner wall tube 1 and the outer wall tube 2 are a concentric structure;

[0017] One end of the inner wall tube 1 is connected to the fuel delivery channel of the fuel injector 3, a ferrule 6 is arranged between the fuel injector 3 and the inner wall tube 1, a conical structure is arranged on the outer side of the fuel injector 3, the ferrule 6 is sleeved at the conical position, and a sealing pipe joint 5 is sealed between the outer wall tube 2 and the outer side of the fuel injector 3;

[0018] The interior of the sealing pipe connection 5 is provided with an outer wall tube sealing section 51, a ferrule pressing boss section 52, a threaded section 53 and a fuel injector outer wall sealing section 54 in sequence. The inner sides of the outer wall tube sealing section 51 and the fuel injector outer wall sealing section 54 are both provided with sealing ring grooves, and the first sealing ring 7 and the second sealing ring 8 are respectively provided in the two sealing ring grooves for achieving sealing between the sealing pipe connection 5 and the outer wall tube 2 and the fuel injector 3. The inner side surface of the ferrule pressing boss section 52 is provided with a boss for pressing the ferrule 6, and the threaded section 53 is threadedly connected with the external thread on the fuel injector 3.

[0019] Furthermore, in order to allow the fuel to be collected into the fuel leakage channel when the inner wall tube 1 leaks, a notch is provided on the notch tube sleeve 4 .

[0020] Furthermore, in order to facilitate the flow of leaked fuel between the fuel injector 3 and the inner wall tube 1, a 30° notch is provided on the boss in the ferrule pressing boss section 52 .

[0021] The ferrule pressing boss section 52 of the sealing pipe joint 5 applies stress to the ferrule 6 under the limiting condition of the fuel injector 3. After the ferrule 6 is deformed, it forms a seal together with the conical structure of the fuel injector 3, thereby sealing the inner wall tube 1. The fuel can be transported in the inner wall tube 1 without leakage.

[0022] The stress of deformation of the ferrule 6 is applied by the axial movement provided by the threaded section 53 of the sealing pipe connection 5 and the thread on the fuel injector 3, thereby achieving sealing reliability.

[0023] The utility model uses the concentric structure of the inner wall tube 1 and the outer wall tube 2 to transport the fuel in the inner wall tube, and the notched tube sleeve 4 is provided to achieve the sealing of the inner wall tube 2; by providing the ferrule 6 and the sealing pipe joint 5, when the sealing of the inner pipeline fails due to a component failure, the fuel can be collected in the fuel leakage channel between the inner wall tube 1 and the outer wall tube 2, thereby achieving sealing and improving the safety of use.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-wall fuel pipe sealing structure, comprising an inner wall pipe (1) and an outer wall pipe (2), wherein the outer wall pipe (2) is sleeved on the outer side of the inner wall pipe (1), characterized in that: A notched tube sleeve (4) is provided between the connection between the inner wall tube (1) and the outer wall tube (2); one end of the inner wall tube (1) is connected to a fuel delivery channel of a fuel injector (3); a ferrule (6) is provided between the fuel injector (3) and the inner wall tube (1); and a sealed tube joint (5) is provided between the outer wall tube (2) and the outer side surface of the fuel injector (3) for sealing connection.

2. A double-wall fuel pipe sealing structure according to claim 1, characterized in that: The notched pipe sleeve (4) is provided with a notch.

3. A double-wall fuel pipe sealing structure according to claim 1, characterized in that: The notched tube sleeve (4) is in interference fit with the inner wall tube (1) and the outer wall tube (2).

4. A double-wall fuel pipe sealing structure according to claim 1, characterized in that: The interior of the sealing pipe joint (5) is provided with an outer wall tube sealing section (51), a ferrule pressing boss section (52), a threaded section (53) and a fuel injector outer wall sealing section (54) in sequence; the inner side surfaces of the outer wall tube sealing section (51) and the fuel injector outer wall sealing section (54) are both provided with sealing ring grooves; a first sealing ring (7) and a second sealing ring (8) are respectively provided in the two sealing ring grooves for achieving sealing between the sealing pipe joint (5) and the outer wall tube (2) and the fuel injector (3); the inner side surface of the ferrule pressing boss section (52) is provided with a boss for pressing the ferrule (6); the threaded section (53) is threadedly connected with the external thread on the fuel injector (3).

5. A double-wall fuel pipe sealing structure according to claim 4, characterized in that: The boss in the clamping sleeve pressing boss section (52) is provided with a 30° notch.

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