Fuel oil inlet pipe

Abstract

The utility model belongs to the technical field of oil inlet pipes, and particularly relates to a fuel oil inlet pipe which comprises a pipe body, a first connecting joint is arranged at the end of the pipe body, and the first connecting joint is connected with a second connecting joint in a matched mode, and the second connecting joint is arranged at an oil inlet of a fuel oil pump connected with the fuel oil inlet pipe. A sealing gasket for sealing the first connecting joint and the second connecting joint is arranged between the first connecting joint and the second connecting joint, a first annular groove is formed in the joint of the first connecting joint and the second connecting joint, and a wear-resistant ring is arranged in the first annular groove; the first annular groove is formed in the connecting position of the first connecting joint of the fuel oil connecting pipe and the second connecting joint located at the fuel oil inlet of the fuel oil pump, and the wear-resisting ring is arranged in the first annular groove, so that the sealing gasket can be prevented from being scoured and eroded through shielding of the wear-resisting ring on the sealing gasket; the service life of the sealing gasket is effectively prolonged, and long-acting sealing is guaranteed.

Description

Technical Field

[0001] This utility model belongs to the field of fuel inlet pipe technology, and particularly relates to a fuel inlet pipe. Background Technology

[0002] In small and medium-sized or traditional agricultural machinery, a low-pressure fuel supply system is usually used. In the low-pressure fuel supply system, the fuel inlet pipe is usually connected by two connectors. For example, one end of the fuel inlet pipe is connected to the fuel tank and the other end is connected to the fuel pump. In order to facilitate the disassembly of the fuel inlet pipe, the connector is usually connected to the fuel pump inlet and a sealing gasket is installed at the connection.

[0003] Traditional connection methods typically compress and deform the gasket at the joint to ensure sealing performance. However, this deformation often causes one end of the gasket to protrude from the inner wall of the joint, making it susceptible to erosion and corrosion from fuel flow. This can damage the gasket, shorten its lifespan, and even lead to fuel leakage, creating safety hazards. Even if the gasket size is adjusted so that it doesn't protrude from the inner wall under pressure, the inner end face of the deformed gasket is not smooth. Therefore, even if one end of the gasket doesn't protrude from the inner wall, it will still create grooves or other uneven surfaces at the joint, causing eddy currents and further eroding and corroding the gasket, thus affecting its lifespan. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned technical problems by providing a fuel inlet pipe that extends the service life of the sealing gasket at the connection between the connector and the fuel pump, ensuring a long-lasting seal.

[0005] In view of this, the present invention provides a fuel inlet pipe, comprising:

[0006] The pipe body has a first connecting joint at one end;

[0007] The second connecting connector is located at the fuel inlet of the fuel pump connected to the fuel inlet pipe and can be connected to the first connecting connector.

[0008] A sealing gasket is installed between the first connecting joint and the second connecting joint, and is used to seal the connection between the two.

[0009] Specifically, a first annular groove is formed at the connection between the first connecting joint and the second connecting joint, and a wear-resistant ring is provided in the first annular groove.

[0010] In the above technical solution, further:

[0011] The second connecting joint has a first annular groove at the first annular groove, and forms a cavity for installing a sealing gasket with the side of the wear-resistant ring away from the axis.

[0012] In the above technical solution, further:

[0013] The chamber is set corresponding to the middle section of the wear-resistant ring.

[0014] In the above technical solution, further:

[0015] Both the first connecting joint and the second connecting joint have inclined inner walls that slope away from the axis on the side closest to the first annular groove.

[0016] The inclination angle of the inclined inner wall is 3-5°.

[0017] In the above technical solution, further:

[0018] The inner wall of the wear-resistant ring on the side near the shaft center smoothly transitions with the inner walls of the first and second connecting joints.

[0019] In the above technical solution, further:

[0020] The surface of the first connecting joint is provided with multiple second annular grooves, and a sealing ring is fitted inside the second annular grooves.

[0021] In the above technical solution, further:

[0022] The second connecting joint has a second annular groove at one end near the first connecting joint, and a third annular groove is formed on the inner wall of the second annular groove.

[0023] The first connecting joint has an annular protrusion that mates with the second annular groove, and a retaining spring is provided in the third annular groove to axially limit the first connecting joint.

[0024] In the above technical solution, further:

[0025] The first connecting joint has a third annular groove at one end near the pipe body, and one end of the pipe body is located in the third annular groove, with a smooth transition between the inner wall of the pipe body and the inner wall of the first connecting joint.

[0026] The beneficial effects of this utility model are as follows:

[0027] 1. By setting a first annular groove at the connection between the first connecting joint of the fuel connection pipe and the second connecting joint located at the fuel pump inlet, and setting a wear-resistant ring in the first annular groove, the wear-resistant ring can shield the gasket to prevent erosion and corrosion, effectively extend the service life of the gasket, and ensure long-term sealing.

[0028] 2. By using the radial limiting function of the wear-resistant ring itself, and in conjunction with the first annular groove and the end face of the first connecting joint to form a cavity, the sealing gasket is restricted and filled into the cavity, which can effectively ensure the sealing performance of the connection between the first connecting joint and the second connecting joint.

[0029] 3. By opening multiple second annular grooves on the surface of the first connecting joint and fitting a sealing ring inside the second annular groove, a multi-seal design can be formed between the first connecting joint and the second connecting joint, providing sealing performance between the first connecting joint and the second connecting joint even after the sealing gasket fails.

[0030] 4. By using a snap ring to axially limit the first connecting joint, the ease of disassembly and assembly between the first and second connecting joints is effectively improved, while still being sufficient to handle the low-pressure fuel supply system, thus increasing the efficiency of replacing the fuel inlet pipe that needs to be replaced. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is an internal sectional view of the present invention;

[0033] Figure 3 This is a utility model Figure 2 Enlarged view of point A in the middle;

[0034] Figure 4 This is an exploded view of the present invention;

[0035] The markings in the diagram are as follows: 1. Pipe body; 2. First connecting joint; 3. Second connecting joint; 4. Sealing gasket; 5. First annular groove; 6. Wear-resistant ring; 7. First annular groove; 8. Inclined inner wall; 9. Second annular groove; 10. Sealing ring; 11. Second annular groove; 12. Third annular groove; 13. Annular protrusion; 14. Snap ring; 15. Third annular groove. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0037] Example 1:

[0038] This embodiment provides a fuel inlet pipe, including:

[0039] Pipe body 1, with a first connecting joint 2 at one end;

[0040] The second connecting connector 3 is located at the fuel inlet of the fuel pump connected to the fuel inlet pipe, and can be connected to the first connecting connector 2.

[0041] A sealing gasket 4 is installed between the first connecting joint 2 and the second connecting joint 3 and is used to seal the connection between the two.

[0042] Wherein, a first annular groove 5 is provided at the connection between the first connecting joint 2 and the second connecting joint 3, and a wear-resistant ring 6 is provided in the first annular groove 5;

[0043] Furthermore, the first annular groove 5 is composed of two annular grooves respectively formed on the first connecting joint 2 and the second connecting joint 3;

[0044] Meanwhile, the second connecting joint 3 is a conventional setting for traditional fuel pumps, so its connection with the fuel pump is existing technology and will not be described in detail here. The sealing gasket 4 can be made of rubber, and the wear ring 6 can be made of polyetheretherketone (PEEK), hard chrome plated metal ring or tungsten carbide ceramic ring.

[0045] As can be seen from this embodiment, by setting a first annular groove 5 at the connection between the first connecting joint 2 of the fuel connection pipe and the second connecting joint 3 located at the fuel pump inlet, and setting a wear-resistant ring 6 in the first annular groove 5, the wear-resistant ring 6 can block the sealing gasket 4, thereby avoiding the scouring and erosion of the sealing gasket 4, effectively extending the service life of the sealing gasket 4, and ensuring long-term sealing.

[0046] Example 2:

[0047] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0048] The second connecting joint 3 has a first annular groove 7 at the first annular groove 5, and forms a cavity for installing the sealing gasket 4 with the side of the wear-resistant ring 6 away from the axis.

[0049] As can be seen from this embodiment, by using the radial limiting function of the wear-resistant ring 6 itself, and in conjunction with the first annular groove 7 and the end face of the first connecting joint 2 to form a cavity, the sealing gasket 4 is restricted and filled into the cavity, which can effectively ensure the sealing performance of the connection between the first connecting joint 2 and the second connecting joint 3.

[0050] Example 3:

[0051] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0052] The chamber is set in a corresponding manner to the middle section of the wear-resistant ring 6.

[0053] As can be seen from this embodiment, by setting the chamber to correspond with the middle section of the wear-resistant ring 6, the distance at which a very small portion of the fuel at both ends of the wear-resistant ring 6 enters the sealing gasket 4 through the gap between the wear-resistant ring 6 and the first annular groove 5 can be effectively balanced, thus avoiding a greater degree of erosion of the sealing gasket 4 by the fuel due to the short distance on one side.

[0054] Example 4:

[0055] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0056] The inner wall of the wear-resistant ring 6 near the shaft center transitions smoothly with the inner walls of the first connecting joint 2 and the second connecting joint 3.

[0057] As can be seen from this embodiment, the smooth transition between the wear ring 6 and the inner walls of the first connecting joint 2 and the second connecting joint 3 can effectively reduce the impact of eddies or turbulence on the stability of fuel flow caused by sudden changes in diameter, and avoid increasing the erosion intensity on the wear ring 6.

[0058] Example 5:

[0059] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0060] Both the first connecting joint 2 and the second connecting joint 3 have inclined inner walls 8 that slope away from the axis on the side near the first annular groove 5.

[0061] The inclination angle of the inclined inner wall 8 is 3-5°, and the inclination angle adopted in this application is 4°.

[0062] As can be seen from this embodiment, by setting the inclined inner wall 8, the scouring and erosion at the connection between the first connecting joint 2 and the second connecting joint 3 can be mainly concentrated on the wear-resistant ring 6, which can help extend the service life of the first connecting joint 2 and the second connecting joint 3 to a certain extent.

[0063] Furthermore, the first connector 2 and the second connector 3 can be made of conventional alloy materials, which helps to reduce costs.

[0064] Example 6:

[0065] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0066] The surface of the first connecting joint 2 is provided with a plurality of second annular grooves 9, and a sealing ring 10 is fitted inside the second annular grooves 9;

[0067] The sealing ring 10 can be made of rubber.

[0068] As can be seen from this embodiment, by opening multiple second annular grooves 9 on the surface of the first connecting joint 2 and fitting a sealing ring 10 inside the second annular grooves 9, a multi-seal design can be formed between the first connecting joint 2 and the second connecting joint 3, so that even after the sealing gasket 4 fails, it can provide sealing performance between the first connecting joint 2 and the second connecting joint 3.

[0069] Example 7:

[0070] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0071] The second connecting joint 3 has a second annular groove 11 at one end near the first connecting joint 2, and a third annular groove 12 is provided on the inner wall of the second annular groove 11.

[0072] The first connecting joint 2 is provided with an annular protrusion 13 that cooperates with the second annular groove 11, and a retaining spring 14 is provided in the third annular groove 12 to axially limit the first connecting joint 2.

[0073] As can be seen from this embodiment, by using a snap ring 14 to axially limit the first connecting joint 2, the ease of disassembly and assembly between the first connecting joint 2 and the second connecting joint 3 is effectively improved, while still being sufficient to handle the low-pressure fuel supply system, thus improving the efficiency of replacing the fuel inlet pipe that needs to be replaced.

[0074] Example 8:

[0075] This embodiment provides a fuel inlet pipe, which, in addition to the technical solutions of the above embodiments, also has the following technical features:

[0076] The first connecting joint 2 has a third annular groove 15 at one end near the pipe body 1, and one end of the pipe body 1 is located in the third annular groove 15, and the inner wall of the pipe body 1 and the inner wall of the first connecting joint 2 are smoothly connected.

[0077] The pipe body 1 and the first connecting joint 2 are welded together.

[0078] As can be seen from this embodiment, by opening the third annular groove 15 and smoothly transitioning between the inner wall of the pipe body 1 and the inner wall of the first connecting joint 2, the possibility of eddies or turbulence generated at the connection point of the two during fuel flow can be effectively reduced, thereby effectively improving the stability of fuel flow, reducing scouring and erosion, and extending service life.

[0079] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A fuel filler pipe, characterized by, include: The pipe body (1) has a first connecting joint (2) at its end; The second connecting connector (3) is located at the fuel inlet of the fuel pump connected to the fuel inlet pipe and can be connected to the first connecting connector (2). A sealing gasket (4) is installed between the first connecting joint (2) and the second connecting joint (3) and is used for sealing the connection between the two. Wherein, a first annular groove (5) is opened at the connection between the first connecting joint (2) and the second connecting joint (3), and a wear-resistant ring (6) is provided in the first annular groove (5).

2. The fuel inlet pipe according to claim 1, characterized in that: The second connecting joint (3) has a first annular groove (7) at the first annular groove (5), and forms a cavity for installing the sealing gasket (4) with the side of the wear-resistant ring (6) away from the axis.

3. The fuel inlet pipe according to claim 2, characterized in that: The chamber is set in a manner corresponding to the middle section of the wear-resistant ring (6).

4. The fuel inlet pipe according to claim 1, characterized in that: The inner wall of the wear-resistant ring (6) near the shaft center is smoothly connected to the inner walls of the first connecting joint (2) and the second connecting joint (3).

5. The fuel inlet pipe according to claim 4, characterized in that: The first connecting joint (2) and the second connecting joint (3) are both provided with inclined inner walls (8) that are inclined away from the axis on the side near the first annular groove (5). The inclination angle of the inclined inner wall (8) is 3-5°.

6. The fuel inlet pipe according to claim 1, characterized in that: The surface of the first connecting joint (2) is provided with a plurality of second annular grooves (9), and a sealing ring (10) is fitted inside the second annular grooves (9).

7. The fuel inlet pipe according to claim 1, characterized in that: The second connecting joint (3) has a second annular groove (11) at one end near the first connecting joint (2), and a third annular groove (12) is provided on the inner wall of the second annular groove (11). The first connecting joint (2) is provided with an annular protrusion (13) that cooperates with the second annular groove (11), and a retaining spring (14) is provided in the third annular groove (12) to axially limit the first connecting joint (2).

8. The fuel inlet pipe according to claim 1, characterized in that: The first connecting joint (2) has a third annular groove (15) at one end near the pipe body (1), and one end of the pipe body (1) is located in the third annular groove (15), and the inner wall of the pipe body (1) and the inner wall of the first connecting joint (2) are smoothly connected.

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