A multi-stage filtration fuel water separation filter element

Abstract

The utility model relates to fuel filtration technical field, and disclose a kind of multistage filtration's fuel water separation filter core, including upper end cover, lower end cover, skeleton, filter assembly and limiting component. Filter assembly is from inside to outside polypropylene meltblown layer, glass fibre layer, ePTFE hydrophobic membrane and support net, can multistage filtration impurity and separate moisture. Limiting component contains limiting block, limiting plate and spring, and recess of cooperation skeleton realizes quick dismounting and mounting;Upper end cover and lower end cover are respectively equipped with first sealing ring, second sealing ring sealing. When working, fuel enters by liquid inlet, and sequentially purifies by filter assembly, and then flows out by support net. It improves purification effect by multistage filtration, limiting structure is convenient to dismount, and sealing ring guarantees sealing, and it is suitable for fuel purification of engine and other equipment.

Description

Technical Field

[0001] This utility model relates to the field of fuel filtration technology, specifically a multi-stage fuel-water separation filter element. Background Technology

[0002] In the fuel supply systems of engines and other equipment, water and impurities in the fuel can severely affect the normal operation of the equipment, reducing its performance and service life. However, existing filtration devices generally suffer from insufficient filtration stages, making it difficult to efficiently remove water and various impurities from the fuel; the disassembly and assembly process is cumbersome, hindering rapid maintenance and replacement; and the sealing performance is poor, easily leading to fuel leakage and other problems. These shortcomings fail to meet the practical application requirements for efficient fuel purification and convenient maintenance. Therefore, there is an urgent need for a filter element with multi-stage filtration capabilities, capable of efficiently separating fuel and water, easy to disassemble and assemble, and with reliable sealing. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a multi-stage fuel-water separator filter element to solve the problems of existing filtration devices being unable to efficiently remove water and various impurities from fuel, as well as being difficult to maintain and replace quickly.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a multi-stage filtration fuel-water separator filter element, comprising an upper end cover, a lower end cover, a filter assembly, and a limiting assembly. The upper end cover has a liquid inlet in the middle, and a lower end cover is provided below the upper end cover. A frame is provided between the upper end cover and the lower end cover. The filter assembly is sleeved on the outside of the frame. An annular fixing block is provided at the upper end of the frame. Two grooves are provided opposite each other on the inner wall of the annular fixing block. A cavity is provided on the upper end cover corresponding to the grooves. An opening is provided on the side of the cavity away from the liquid inlet. The radial dimension of the opening is smaller than the radial dimension of the cavity, forming a stepped limiting structure. A limiting assembly is provided inside the cavity.

[0005] The limiting assembly includes a limiting block, a limiting plate, and a spring. The limiting block has a lower inclined surface and a left inclined surface at one end near the cavity opening. The end of the limiting block away from the opening is fixedly connected to one end of the limiting plate. The radial dimension of the limiting plate is larger than the radial dimension of the opening and smaller than the radial dimension of the cavity. The other end of the limiting plate is fixedly connected to one end of the spring, and the other end of the spring is fixedly connected to the side of the inner wall of the cavity away from the opening.

[0006] Preferably, the filter assembly fitted on the outer side of the skeleton consists of, from the inside out, a polypropylene meltblown layer, a glass fiber layer, an ePTFE hydrophobic membrane, and a support mesh.

[0007] Preferably, the outer periphery of the skeleton is provided with a plurality of through holes arranged in a ring array.

[0008] Preferably, the lower end cover is provided with a mounting block on its top, the mounting block is provided with an internal thread on its outer periphery, and the lower end of the frame is provided with a matching external thread on its inner periphery, so that the lower end cover and the frame are threadedly connected through the internal thread and the external thread.

[0009] Preferably, a first sealing ring is fixedly connected to the bottom of the upper end cover, and the first sealing ring is located on the outer periphery of the top of the support mesh.

[0010] Preferably, a second sealing ring is fixedly connected to the top of the lower end cover, and the second sealing ring is located on the outer periphery of the bottom end of the support mesh.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The filter employs an inward-outward gradient filtration structure to sequentially intercept particles, coalesce water droplets, and efficiently separate free water, significantly improving fuel cleanliness. A design incorporating a limiting component utilizes the double-sloped surface of the limiting block in conjunction with a spring to enable quick-release of the filter frame, avoiding the cumbersome operation of traditional threaded disassembly. The stepped limiting structure ensures the reliability of the limiting component in preventing detachment. The design of the first sealing ring on the upper end cap and the second sealing ring on the lower end cap forms a radial sealing barrier at both ends of the support mesh, effectively preventing bypass leakage of unfiltered fuel. The threaded connection between the lower end cap and the filter frame facilitates the individual replacement of the filter component, ultimately achieving simultaneous optimization of filtration efficiency, sealing reliability, and maintenance convenience. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0014] Figure 2 This is a schematic diagram of the filter assembly structure of this utility model;

[0015] Figure 3 This is a cross-sectional view of the internal structure of the upper end cap of this utility model;

[0016] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the middle.

[0017] The components are as follows: 1. Upper end cap; 101. Liquid inlet; 102. First sealing ring; 103. Cavity; 2. Lower end cap; 201. Mounting block; 202. Internal thread; 203. Second sealing ring; 3. Skeleton; 301. Annular fixing block; 302. Groove; 303. Through hole; 4. Polypropylene meltblown layer; 5. Glass fiber layer; 6. ePTFE hydrophobic membrane; 7. Support mesh; 8. Limiting block; 9. Limiting plate; 10. Spring. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1 - Figure 4 A multi-stage filtration fuel-water separator filter element, characterized in that: it includes an upper end cover 1, a lower end cover 2, a filter assembly, and a limiting assembly. The upper end cover 1 has a liquid inlet 101 in the middle, and the lower end cover 2 is provided below the upper end cover 1. A frame 3 is provided between the upper end cover 1 and the lower end cover 2. The filter assembly is sleeved on the outside of the frame 3. An annular fixing block 301 is provided at the upper end of the frame 3. Two grooves 302 are provided opposite to each other on the inner wall of the annular fixing block 301. A cavity 103 is provided on the upper end cover 1 corresponding to the grooves 302. An opening is provided on the side of the cavity 103 away from the liquid inlet 101. The radial dimension of the opening is smaller than the radial dimension of the cavity 103, forming a stepped limiting structure. A limiting assembly is provided inside the cavity 103.

[0020] The limiting assembly includes a limiting block 8, a limiting plate 9, and a spring 10. The limiting block 8 has a lower inclined surface and a left inclined surface at one end near the opening of the cavity 103. The end of the limiting block 8 away from the opening is fixedly connected to one end of the limiting plate 9. The radial dimension of the limiting plate 9 is greater than the radial dimension of the opening and less than the radial dimension of the cavity 103. The other end of the limiting plate 9 is fixedly connected to one end of the spring 10. The other end of the spring 10 is fixedly connected to the side of the inner wall of the cavity 103 away from the opening.

[0021] The lower end cover 2 is provided with a mounting block 201 on its top. The mounting block 201 is provided with an internal thread 202 on its outer periphery. The lower end of the frame 3 is provided with a matching external thread on its inner periphery. The lower end cover 2 and the frame 3 are connected by the internal thread 202 and the external thread.

[0022] Through the above technical solution, in the limiting component, the design of the lower inclined surface and the left inclined surface of the limiting block 8, combined with the elastic force of the spring 10, allows the frame 3 to compress the lower inclined surface during installation, causing the limiting block 8 to retract into the cavity 103. After rotation, it is secured into the groove 302 by the pushing force of the spring 10. During disassembly, the frame 3 is rotated in the opposite direction, and the side wall of the groove 302 compresses the left inclined surface, causing the limiting block 8 to retract, achieving quick disassembly and assembly and greatly improving maintenance efficiency. The threaded connection between the lower end cover 2 and the frame 3 not only ensures the sealing and stability of the connection, but also facilitates the separate disassembly of the lower end cover 2 to replace the filter component, reducing the cost of use.

[0023] This utility model provides a technical solution in which the filter assembly sleeved on the outside of the skeleton 3 consists of a polypropylene meltblown layer 4, a glass fiber layer 5, an ePTFE hydrophobic membrane 6, and a support mesh 7, from the inside to the outside.

[0024] Through the above technical solution, fuel flows from the inside out through the polypropylene meltblown layer 4 to intercept solid particles, the glass fiber layer 5 to aggregate tiny water droplets, the ePTFE hydrophobic membrane 6 to block free water, and finally the support mesh 7 to provide structural protection, forming a physical barrier for gradient filtration. This achieves efficient separation of impurities and water in the fuel in stages while ensuring high flowability.

[0025] This utility model provides a technical solution in which a first sealing ring 102 is fixedly connected to the bottom of the upper end cover 1, and the first sealing ring 102 is located on the outer periphery of the top end of the support net 7. A second sealing ring 203 is fixedly connected to the top of the lower end cover 2, and the second sealing ring 203 is located on the outer periphery of the bottom end of the support net 7.

[0026] Through the above technical solution, the first sealing ring 102 and the second sealing ring 203 form a bidirectional radial sealing barrier at the top and bottom of the support net 7, respectively, effectively blocking the bypass leakage path of unfiltered fuel along the gap between the support net 7 and the end cap, ensuring that the fuel is forced to flow through the gradient filter layer, and at the same time, the elastic seal compensates for the deformation under assembly tolerance and vibration conditions, taking into account both sealing reliability and structural adaptability.

[0027] The working principle of this utility model is as follows:

[0028] Fuel enters the central channel of the frame 3 through the inlet 101 of the upper cap 1. As it flows radially outward through the through-hole 303 of the frame 3, it sequentially passes through the polypropylene melt-blown layer 4 to intercept solid particles, the glass fiber layer 5 to coalesce and emulsify water droplets, and the ePTFE hydrophobic membrane 6 to block free water molecules. Finally, clean fuel is output through the filter layer reinforced by the support mesh 7. When the frame 3 is not installed, the spring 10 pushes the limiting plate 9 to abut against the stepped limiting structure, so that only the inclined part of the limiting block 8 is exposed at the opening. During installation, the frame 3 is inserted upwards, limiting the movement. The lower inclined surface of block 8 is squeezed into cavity 103. After rotating the frame 3 so that the groove 302 is aligned with the opening, the spring 10 pushes the limiting block 8 to lock in place. At the same time, the lower end of the frame 3 is fastened to the lower end cover 2 by threads. When disassembling, rotate the frame in the opposite direction. The side wall of the groove 302 squeezes the left inclined surface of the limiting block 8 to release the lock and pull it out. During this process, the sealing rings of the upper and lower end covers continuously press the two ends of the support net 7 to form a radial seal, forcing the fuel to flow through the entire filter layer and blocking the bypass leakage, thus achieving the synergistic operation of efficient separation and reliable sealing.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-stage filtered fuel water separation cartridge, characterized by: The device includes an upper end cover (1), a lower end cover (2), a filter assembly, and a limiting assembly. The upper end cover (1) has an inlet (101) in the middle. The lower end cover (2) is located below the upper end cover (1). A frame (3) is located between the upper end cover (1) and the lower end cover (2). The filter assembly is sleeved on the outside of the frame (3). An annular fixing block (301) is located at the upper end of the frame (3). Two grooves (302) are arranged opposite each other on the inner wall of the annular fixing block (301). A cavity (103) is provided on the upper end cover (1) corresponding to the grooves (302). An opening is provided on the side of the cavity (103) away from the inlet (101). The radial dimension of the opening is smaller than the radial dimension of the cavity (103), forming a stepped limiting structure. A limiting assembly is provided inside the cavity (103). The limiting assembly includes a limiting block (8), a limiting plate (9), and a spring (10). The limiting block (8) has a lower inclined surface and a left inclined surface at one end near the opening of the cavity (103). The end of the limiting block (8) away from the opening is fixedly connected to one end of the limiting plate (9). The radial dimension of the limiting plate (9) is greater than the radial dimension of the opening and less than the radial dimension of the cavity (103). The other end of the limiting plate (9) is fixedly connected to one end of the spring (10). The other end of the spring (10) is fixedly connected to the side of the inner wall of the cavity (103) away from the opening.

2. A multi-stage filtered fuel water separation cartridge according to claim 1, characterized in that: The filter components fitted on the outside of the skeleton (3) consist, from the inside out, a polypropylene meltblown layer (4), a glass fiber layer (5), an ePTFE hydrophobic membrane (6), and a support mesh (7).

3. A multi-stage filtered fuel water separation cartridge according to claim 1, characterized in that: The skeleton (3) has multiple through holes (303) arranged in a ring array on its outer periphery.

4. A multi-stage filtered fuel water separation cartridge according to claim 1, characterized in that: The lower end cover (2) is provided with a mounting block (201) on the top. The mounting block (201) is provided with an internal thread (202) on the outer periphery. The lower end of the skeleton (3) is provided with a matching external thread. The lower end cover (2) and the skeleton (3) are connected by the internal thread (202) and the external thread.

5. A multi-stage filtered fuel water separation cartridge according to claim 1, characterized in that: The bottom of the upper cover (1) is fixedly connected to a first sealing ring (102), which is located on the outer periphery of the top of the support net (7).

6. A multi-stage filtered fuel water separation cartridge according to claim 1, characterized in that: The lower end cover (2) is fixedly connected to the top of a second sealing ring (203), which is located on the outer periphery of the bottom end of the support net (7).

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