Fuel filter

Abstract

A fuel filter comprises a shell, a sealing cover is connected to the lower end of the shell, a water drainage hole is formed in the lower end of the sealing cover, and a water drainage plug is arranged in the water drainage hole. An outlet pipe is arranged at the upper end of the shell, an inlet pipe is arranged in the middle of the shell, a strip-shaped channel hole is formed in the surface of the inlet pipe, and the inlet pipe is sleeved with a filtering assembly; the filter assembly comprises an oil-water separation filter element, an upper end cover and a lower end cover, the upper end cover and the lower end cover are fixedly connected to the upper end and the lower end of the oil-water separation filter element respectively, a filter screen end cover is installed above the upper end cover, the filter screen end cover is in sealed connection with the inner wall of the shell through a first sealing ring, and an inner cavity of the shell is divided into a lower cavity body and an upper cavity body by the filter screen end cover; a water blocking filter screen is fixedly embedded in the side surface of the filter screen end cover, the lower cavity is communicated with the upper cavity through the water blocking filter screen, the outlet pipe is communicated with the upper cavity, a supporting plate is fixedly installed in the sealing cover, and the lower end cover is fixedly installed on the supporting plate. The oil-water separator overcomes the defects in the prior art so as to effectively improve the oil-water separation efficiency and stability.

Description

Technical Field

[0001] The utility model relates to an internal combustion engine, in particular to a fuel filter technology, in particular to a fuel filter. Background Art

[0002] In the fuel system, the fuel may contain a certain amount of water. If this water is not effectively separated, it may have an adverse effect on the normal operation of the fuel system. There are various fuel filters in the prior art, some of which are achieved through a water-collecting layer structure inside the filter element. The water is absorbed by the water-collecting layer and then slides to the bottom along the water-collecting layer under gravity to achieve water separation. In addition, there is a filter screen that covers the outside of the filter element with a circle of filter paper. The oil can pass through the filter screen but the water is blocked. The blocked water sinks to the bottom along the surface of the mesh structure under gravity to achieve water separation. However, the solution of collecting and separating water inside the filter element is easily affected by the flow of the inlet liquid, resulting in the separated water being impacted and unable to be stably maintained in the water collection chamber. In addition, the gap between the filter screen and the filter paper is small, and the space for the separated water to sink is narrow, resulting in the separated water having difficulty sinking and falling due to lateral impact. Utility Model Content

[0003] In view of the deficiencies of the prior art, the utility model provides a fuel filter, which aims to solve the problems of low water separation efficiency and limited filter structure space in fuel filtration.

[0004] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0005] A fuel filter comprises a housing, a sealing cap being threadedly connected to the lower end of the housing, a drain hole being formed at the lower end of the sealing cap, and a drain plug being installed in the drain hole; an outlet pipe being provided at the upper end of the housing, and an inlet pipe being vertically provided in the middle of the housing, the lower end of the inlet pipe being sealed, the upper end of the inlet pipe passing through the housing and communicating with the outside, a strip-shaped passage hole being formed on the side surface of the inlet pipe, and a filter assembly being sleeved on the outer side of the inlet pipe;

[0006] The filter assembly includes an oil-water separation filter element, an upper end cover and a lower end cover, the oil-water separation filter element is sleeved on the outer surface of the inlet pipe, the upper end cover and the lower end of the oil-water separation filter element are respectively fixedly connected to the upper end and the lower end of the oil-water separation filter element, the upper end cover is fixedly installed with a filter end cover, the outer side of the filter end cover is fixedly installed with a first sealing ring, the filter end cover is sealed with the inner wall of the shell through the first sealing ring, the filter end cover divides the inner cavity of the shell into a lower cavity and an upper cavity, a water-blocking filter is fixedly embedded in the side surface of the filter end cover, the lower cavity is connected to the upper cavity through the water-blocking filter, the outlet pipe is connected to the upper cavity, a support plate is fixedly installed in the cover, and the lower end cover is fixedly installed on the support plate.

[0007] Preferably, a support ring is fixedly mounted on the outer surface of the oil-water separation filter element.

[0008] Preferably, a buckle is fixedly connected above the upper end cover, a female buckle is provided inside the filter end cover, and the buckle is snap-connected with the female buckle.

[0009] Preferably, a second sealing ring is installed in the inner ring wall of the upper end cover, and the upper end cover is sealed to the outer side surface of the inlet pipe through the second sealing ring.

[0010] Preferably, a third sealing ring is fixedly installed between the upper end cover and the filter end cover.

[0011] Preferably, a fourth sealing ring is fixedly mounted on the inner ring of the lower end cover, and the lower end cover is sealed to the outer side surface of the inlet pipe via the fourth sealing ring.

[0012] Preferably, a fifth sealing ring is fixedly mounted on the outer surface of the drain plug, and the drain plug is sealedly connected to the drain hole via the fifth sealing ring.

[0013] The utility model provides a fuel filter. It has the following beneficial effects: by directing the fuel to be filtered from the interior of the oil-water separation filter element outward through the filter, and passing it upward from the outer lower cavity through an axially arranged water-blocking filter screen, the axially designed water-blocking filter screen can be increased in length in the axial direction, thereby increasing the filter screen area, thereby effectively reducing resistance to the fuel and improving the fuel flow rate. Furthermore, because the oil-water separation function is implemented within the lower cavity and there is no filter screen blocking the exterior of the oil-water separation filter element, there is a wider space, which reduces the impact on the separated water and allows it to sink more smoothly, thereby facilitating the maintenance of a stable water level in the inner cavity of the cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the present invention or the prior art, the following briefly introduces the drawings required for describing the prior art.

[0015] Figure 1 A schematic diagram of the cross-sectional structure of the present utility model;

[0016] Figure 2 A schematic cross-sectional view of the filter assembly and filter end cover in the present invention;

[0017] Figure 3 A schematic cross-sectional view of the filter assembly and filter end cap in the present invention;

[0018] Figure 4 A schematic structural diagram of the filter assembly in the present utility model;

[0019] Figure 5 A schematic structural diagram of the filter end cover of the utility model;

[0020] Description of the numbers in the figure:

[0021] 1. Shell; 2. Sealing cover; 3. Drain hole; 4. Drain plug; 5. Outlet pipe; 6. Inlet pipe; 7. Oil-water separation filter element; 8. Upper end cover; 9. Lower end cover; 10. Filter end cover; 11. First sealing ring; 12. Support plate; 13. Water-blocking filter; 14. Support ring; 15. Buckle; 16. Female buckle; 17. Second sealing ring; 18. Third sealing ring; 19. Fourth sealing ring; 20. Fifth sealing ring; 21. Strip channel hole; 101. Lower cavity; 102. Upper cavity. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention.

[0023] Example 1, as shown in the attached Figure 1-5 As shown, a fuel filter includes a housing 1, a cover 2 being threadedly connected to the lower end of the housing 1, a drain hole 3 being formed at the lower end of the cover 2, and a drain plug 4 being installed in the drain hole 3; an outlet pipe 5 being provided at the upper end of the housing 1, and an inlet pipe 6 being vertically provided in the middle of the housing 1. The lower end of the inlet pipe 6 is sealed, and the upper end of the inlet pipe 6 passes through the housing 1 and is connected to the outside. A strip-shaped channel hole 21 is formed on the side surface of the inlet pipe 6, and a filter assembly is sleeved on the outer side of the inlet pipe 6;

[0024] The filter assembly includes an oil-water separation filter element 7, an upper end cover 8 and a lower end cover 9. The oil-water separation filter element 7 is sleeved on the outer surface of the inlet pipe 6. The upper end cover 8 and the lower end cover 9 are fixedly connected to the upper and lower ends of the oil-water separation filter element 7 respectively. The strip channel hole 21 on the surface of the inlet pipe 6 is located between the upper end cover 8 and the lower end cover 9. A filter end cover 10 is fixedly installed above the upper end cover 8. A first sealing ring 11 is fixedly installed on the outside of the filter end cover 10. The filter end cover 10 is sealed to the inner wall of the shell 1 through the first sealing ring 11. The filter end cover 10 divides the inner cavity of the shell 1 into a lower cavity 101 and an upper cavity 102. A water-blocking filter screen 13 is fixedly embedded in the side surface of the filter end cover 10. The lower cavity 101 is connected to the upper cavity 102 through the water-blocking filter screen 13, and the outlet pipe 5 is connected to the upper cavity 102. A support plate 12 is fixedly installed in the cover 2, and the lower end cover 9 is fixedly installed on the support plate 12.

[0025] Working principle:

[0026] During use, the fuel to be filtered enters the inner cavity of the inlet pipe 6 through the inlet pipe 6 and then flows outward along the strip-shaped channel holes 21 on the surface of the inlet pipe 6. The fuel then enters the oil-water separator filter 7 through the inner surface of the oil-water separator filter 7, thereby filtering impurities and water from the fuel through the oil-water separator filter 7. The filtered fuel passes through the oil-water separator filter 7 and enters the lower cavity 101 of the housing 1. The filtered and separated water accumulates on the surface of the oil-water separator filter 7. After accumulating a certain amount, it flows downward along the oil-water separator filter 7 into the inner cavity of the cover 2 due to gravity. The filtered fuel then passes through the water-blocking filter 13 on the side of the filter end cap 10 and upward into the upper cavity 102, and is then output to the application end through the outlet pipe 5. The filtered and separated water that does not directly sink is also blocked by the water-blocking filter 13 and retained in the outer cavity. It then enters the inner cavity of the cover 2 due to its own gravity, thereby effectively achieving the oil-water separation effect. When a certain amount of water is collected in the inner cavity of the cover 2 , the drain plug 4 can be opened to drain the filtered water.

[0027] The present invention filters the fuel to be filtered from the interior of the oil-water separator filter element 7 outward, and then passes upward from the outer lower cavity through the axially arranged water-blocking screen 13. The axially designed water-blocking screen 13 increases the axial length and thus the filter area, thereby effectively reducing resistance to the fuel and improving the fuel's flow rate. Furthermore, since the oil-water separation function is implemented within the lower cavity 101 and there is no filter screen obstructing the exterior of the oil-water separator filter element 7, there is a wider space, which reduces the impact on the separated water and allows it to sink more smoothly, thereby helping to maintain a stable water level in the inner cavity of the cover 2.

[0028] In this embodiment, the oil-water separation filter element 7 adopts a cylindrical water-collecting filter paper structure, and the water-blocking filter screen 13 has a water-repellent effect. Among them, the cylindrical water-collecting filter paper and the water-blocking filter screen 13 both adopt well-known solutions in the prior art, which are already understood by those skilled in the art and will not be repeated here.

[0029] In the second embodiment, as a further preferred embodiment of the first embodiment, a support ring 14 is fixedly mounted on the outer surface of the oil-water separation filter element 7. The support ring 14 provides a position-limiting support for the oil-water separation filter element 7, thereby effectively preventing the oil-water separation filter element 7 from expanding and deforming outward due to the impact force of the fuel flowing outward from the interior of the oil-water separation filter element 7.

[0030] In the third embodiment, as a further preferred embodiment of the first embodiment, a buckle 15 is fixedly connected to the upper end cover 8, and a female buckle 16 is provided inside the filter end cover 10, and the buckle 15 and the female buckle 16 are engaged. Therefore, during installation, the filter end cover 10 can be coaxially mounted on the upper end cover 8, so that the buckle 15 on the upper end cover 8 is directly engaged with the female buckle 16 inside the filter end cover 10, thereby achieving a fixed connection between the upper end cover 8 and the filter end cover 10.

[0031] In the fourth embodiment, as a further preferred embodiment of the first embodiment, a second sealing ring 17 is installed in the inner ring wall of the upper end cover 8, and the upper end cover 8 is sealed to the outer side surface of the inlet pipe 6 via the second sealing ring 17. The second sealing ring 17 is used to achieve a sealing effect between the upper end cover 8 and the inlet pipe 6, preventing the liquid in the inlet pipe 6 from flowing into the upper cavity 102 through the gap between the upper end cover 8 and the inlet pipe 6.

[0032] Example 5, as a further preferred embodiment of Example 1, a third sealing ring 18 is fixedly installed between the upper end cover 8 and the filter end cover 10. The third sealing ring 18 achieves a sealing effect between the upper end cover 8 and the filter end cover 10, thereby preventing the liquid in the lower cavity 101 from directly flowing into the upper cavity 102 through the gap between the upper end cover 8 and the filter end cover 10.

[0033] Example 6, as a further preferred embodiment of Example 1, a fourth sealing ring 19 is fixedly mounted on the inner ring of the lower end cover 9, and the lower end cover 9 is sealed to the outer side of the inlet pipe 6 via the fourth sealing ring 19. The fourth sealing ring 19 provides a sealing effect between the lower end cover 9 and the inlet pipe 6, preventing the liquid in the inlet pipe 6 from flowing into the inner cavity of the cover 2 through the gap between the lower end cover 9 and the inlet pipe 6.

[0034] In the seventh embodiment, as a further preferred embodiment of the first embodiment, a fifth sealing ring 20 is fixedly mounted on the outer surface of the drain plug 4. The drain plug 4 is sealed to the drain hole 3 via the fifth sealing ring 20. The fifth sealing ring 20 ensures a sealing effect after the drain plug 4 is installed in the drain hole 3.

[0035] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A fuel filter, characterized in that: The invention comprises a shell (1), wherein the lower end of the shell (1) is connected to a sealing cover (2) by a thread, the lower end of the sealing cover (2) is provided with a drain hole (3), and a drain plug (4) is installed in the drain hole (3); an outlet pipe (5) is provided at the upper end of the shell (1), and an inlet pipe (6) is vertically provided in the middle of the shell (1), the lower end of the inlet pipe (6) is sealed, the upper end of the inlet pipe (6) passes through the shell (1) and is connected to the outside, a strip-shaped channel hole (21) is provided in the side surface of the inlet pipe (6), and a filter assembly is sleeved on the outside of the inlet pipe (6); The filter assembly comprises an oil-water separation filter element (7), an upper end cover (8) and a lower end cover (9); the oil-water separation filter element (7) is sleeved on the outer surface of the inlet pipe (6); the upper end cover (8) and the lower end cover (9) are fixedly connected to the upper end and the lower end of the oil-water separation filter element (7), respectively; a filter end cover (10) is fixedly installed above the upper end cover (8); a first sealing ring (11) is fixedly installed on the outer side of the filter end cover (10); the filter end cover (10) is connected to the housing (10) through the first sealing ring (11). ) inner wall is sealed and connected, the filter end cover (10) divides the inner cavity of the shell (1) into a lower cavity (101) and an upper cavity (102), the side surface of the filter end cover (10) is fixedly embedded with a water-blocking filter (13), the lower cavity (101) is connected to the upper cavity (102) through the water-blocking filter (13), the outlet pipe (5) is connected to the upper cavity (102), a support plate (12) is fixedly installed in the cover (2), and the lower end cover (9) is fixedly installed on the support plate (12).

2. A fuel filter according to claim 1, characterized in that: A support ring (14) is fixedly mounted on the outer surface of the oil-water separation filter element (7).

3. The fuel filter according to claim 1, characterized in that: A buckle (15) is fixedly connected to the upper end cover (8), and a female buckle (16) is provided in the filter end cover (10), and the buckle (15) is snap-connected with the female buckle (16).

4. The fuel filter according to claim 1, characterized in that: A second sealing ring (17) is installed in the inner ring wall of the upper end cover (8), and the upper end cover (8) is sealed and connected to the outer side surface of the inlet pipe (6) through the second sealing ring (17).

5. The fuel filter according to claim 1, characterized in that: A third sealing ring (18) is fixedly installed between the upper end cover (8) and the filter end cover (10).

6. The fuel filter according to claim 1, characterized in that: A fourth sealing ring (19) is fixedly mounted on the inner ring of the lower end cover (9), and the lower end cover (9) is sealedly connected to the outer side surface of the inlet pipe (6) via the fourth sealing ring (19).

7. The fuel filter according to claim 1, characterized in that: A fifth sealing ring (20) is fixedly mounted on the outer surface of the drain plug (4), and the drain plug (4) is sealedly connected to the drain hole (3) via the fifth sealing ring (20).

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