Filter element assembly for fuel filter

Abstract

The filter element assembly comprises an upper end cover, a lower end cover and a coalescence filter element fixedly connected between the upper end cover and the lower end cover, an inner ring of the upper end cover extends towards the interior of the coalescence filter element to form a first extension portion, an inner ring of the lower end cover extends towards the interior of the coalescence filter element to form a second extension portion, and the first extension portion and the second extension portion are arranged in the coalescence filter element. A central pipe and an inner framework are fixedly connected between the first extension part and the second extension part, the inner framework is positioned on the inner wall of the coalescence filter element, and the central pipe is positioned at the central holes of the first extension part and the second extension part and is communicated with the central holes of the first extension part and the second extension part; a clean liquid channel is formed among the central pipe, the inner framework, the first extension part and the second extension part, a through hole communicated with the clean liquid channel is formed in the first extension part, and a sealing part used for sealing the inner wall of a shell of the fuel filter is arranged on the outer ring of the upper end cover; the utility model has the advantages of simple structure, high strength, long service life and low cost.

Description

Technical Field

[0001] This utility model relates to fuel filters, and more specifically to a filter element assembly for a fuel filter. Background Technology

[0002] Fuel filters are used to filter fuel to obtain high-quality fuel, which plays a crucial role in engine performance. According to CN214997977U, a fuel coalescing filter element assembly and fuel filter, and CN216767607U, a fuel filter assembly and its filter element, the fuel filter includes a vertical housing with a flange fixedly installed at the upper end of the housing. Fluid passage holes are distributed around the circumference of the flange, and the central hole and through hole of the flange are used for oil inlet and outlet, respectively. Currently, there is a need for a filter element assembly with external inlet and internal outlet. The existing filter element assembly structure is relatively complex and the cost is high. Utility Model Content

[0003] In response to the needs of the prior art, this utility model provides a filter element assembly for a fuel filter, which currently focuses on simplifying the filter element structure and reducing production costs.

[0004] A filter element assembly for a fuel filter includes an upper end cover and a lower end cover, and a coalescing filter element fixedly connected between the upper end cover and the lower end cover. The inner ring of the upper end cover extends into the coalescing filter element to form a first extension, and the inner ring of the lower end cover extends into the coalescing filter element to form a second extension. A central tube and an inner skeleton are fixedly connected between the first extension and the second extension. The inner skeleton is located on the inner wall of the coalescing filter element, and the central tube is located at the central hole of the first extension and the second extension and communicates with the central hole of the first extension and the second extension. A clean fluid channel is formed between the central tube, the inner skeleton, the first extension, and the second extension. A through hole communicating with the clean fluid channel is provided on the first extension. A sealing part for sealing with the inner wall of the fuel filter housing is provided on the outer ring of the upper end cover.

[0005] Further, the sealing part includes a vertical ring body, which is sleeved on the coalescing filter element and integrally connected with the upper end cover. The outer side of the upper end cover protrudes outside the vertical ring body. A transverse ring body is sleeved on the lower part of the vertical ring body. An annular groove is formed between the transverse ring body, the vertical ring body and the upper end cover. The annular groove is used to embed the sealing ring.

[0006] Furthermore, an annular baffle is integrally provided on the upper end cover at a position corresponding to the inner ring of the inner frame, and the annular baffle stops on the inner ring at the top of the inner frame.

[0007] Furthermore, the internal frame is made of perforated plate.

[0008] Furthermore, the through holes are waist-shaped holes, with the long direction of the waist-shaped holes arranged around the circumference of the central hole of the first extension, and several through holes are evenly distributed at the central hole of the first extension.

[0009] Furthermore, the top of the central tube extends through the first extension to form a spout.

[0010] Further, the outer edge of the lower end cap is folded upward to form a first stop ring, and the inner ring of the first stop ring is in contact with the lower part of the outer circumference of the coalescing filter element; the inner edge of the second extension is folded upward to form a second stop ring, and the inner ring of the second stop ring is in contact with or close to the lower part of the central tube.

[0011] Furthermore, the coalescing filter element is formed by pleating composite filter media or synthetic fiber filter media and ultrasonically welding the two ends along the pleating direction.

[0012] The beneficial effects of this utility model are as follows: By forming a clean liquid channel between the central tube, the inner skeleton, the first extension and the second extension, and connecting the through hole on the first extension with the clean liquid channel, and sealing the inner wall of the fuel filter housing with the upper end cap, the oil enters between the coalescing filter element and the housing through the central tube. After being filtered by the coalescing filter element, the oil is discharged through the clean liquid channel and the through hole in sequence. This utility model has a simple structure, high strength, long service life and low cost. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 This is a schematic diagram of the assembly structure of the present invention in a fuel filter. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings. Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. The directional terms such as left, center, right, top, and bottom in the embodiments of the present invention are only relative concepts or referenced to the normal use state of the product, and should not be considered restrictive.

[0016] A filter element assembly for a fuel filter, such as Figure 1As shown, the filter includes an upper end cover 1, a lower end cover 5, and a coalescing filter element 4 fixedly connected between the upper end cover 1 and the lower end cover 5. The inner ring of the upper end cover 1 extends into the coalescing filter element 4 to form a first extension 10, and the inner ring of the lower end cover 5 extends into the coalescing filter element 4 to form a second extension 50. A central tube 2 and an inner frame 7 are fixedly connected between the first extension 10 and the second extension 50. The inner frame 7 is located on the inner wall of the coalescing filter element 4. To improve the strength of the inner frame 7, it is preferably a perforated plate. The central tube 2 is located on the inner wall of the coalescing filter element 4. The first extension 10 and the second extension 50 are connected at their central holes, forming a clean liquid channel between the central tube 2, the inner frame 7, the first extension 10, and the second extension 50. A through hole 11 connected to the clean liquid channel is provided on the first extension 10. To increase the flow rate of the through hole 11, the through hole 11 is an oblong shape, with its longitudinal direction arranged along the circumference of the central hole of the first extension 10. Several through holes 11 are evenly distributed at the central hole of the first extension 10. Figure 2 As shown, to facilitate the connection and sealing between the central tube 2 and the inlet channel 61 in the fuel filter, the top of the central tube 2 passes through the first extension 10 to form a connector 21, which facilitates sealing and fixing of a sealing gasket on the connector 21; a sealing part 3 is provided on the outer ring of the upper end cover 1 for sealing with the inner wall of the housing 65 of the fuel filter. The sealing part 3 includes a vertical ring 32, which is sleeved on the coalescing filter element 4 and integrally connected with the upper end cover 1. The outer side of the upper end cover 1 protrudes outside the vertical ring 32. A transverse ring 33 is sleeved on the lower part of the vertical ring 32. An annular groove 31 is formed between the transverse ring 33, the vertical ring 32 and the upper end cover 1. The annular groove 31 is used to embed the sealing ring 64.

[0017] To facilitate the positioning of the inner frame 7, an annular baffle 12 is integrally installed on the upper end cover 1 at a position corresponding to the inner ring of the inner frame 7. The annular baffle 12 stops on the inner ring at the top of the inner frame 7 and limits the inner frame 7, preventing it from moving inward. To improve the stability of the structure at the lower end cover 5, the outer edge of the lower end cover 5 is folded upward to form a first stop ring 51, the inner ring of the first stop ring 51 is in contact with the lower part of the outer circumference of the coalescing filter element 4; the inner edge of the second extension 50 is folded upward to form a second stop ring 52, the inner ring of the second stop ring 52 is in contact with or close to the lower part of the central tube 2. To increase the filtration area of ​​the coalescing filter element 4, the coalescing filter element 4 is formed by pleating composite filter material or synthetic fiber filter material and ultrasonically welding the two ends along the pleating direction. It can not only filter fuel and remove dust and small metal particles and other solid impurities, but also coalesce non-dissolved water into large water droplets, which facilitates subsequent water-oil separation.

[0018] During operation, the inner wall of the fuel filter housing 65 is sealed to the upper end cover 1 by the sealing ring 64. The oil enters the housing 65 through the inlet channel 61 and the central tube 2 and diffuses into the space between the coalescing filter element 4 and the housing 65. After being filtered by the coalescing filter element 4, the oil passes through the clean liquid channel and the through hole 11 in sequence, and then exits the fuel filter through the liquid passage 621 of the flange 62 and the liquid outlet channel 63.

[0019] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A filter element assembly for a fuel filter, comprising an upper end cover and a lower end cover, and a coalescing filter element fixedly connected between the upper end cover and the lower end cover, characterized in that: The inner ring of the upper end cover extends into the coalescing filter element to form a first extension, and the inner ring of the lower end cover extends into the coalescing filter element to form a second extension. A central tube and an inner skeleton are fixedly connected between the first extension and the second extension. The inner skeleton is located on the inner wall of the coalescing filter element, and the central tube is located at the central hole of the first extension and the second extension and connects the central holes of the first extension and the second extension. A clean fluid channel is formed between the central tube, the inner skeleton, the first extension, and the second extension. A through hole connected to the clean fluid channel is provided on the first extension. A sealing part is provided on the outer ring of the upper end cover for sealing with the inner wall of the fuel filter housing.

2. The filter element assembly for a fuel filter according to claim 1, characterized in that: The sealing part includes a vertical ring body, which is sleeved on the coalescing filter element and integrally connected with the upper end cover. The outer side of the upper end cover protrudes outside the vertical ring body. A transverse ring body is sleeved on the lower part of the vertical ring body. An annular groove is formed between the transverse ring body, the vertical ring body and the upper end cover. The annular groove is used to embed the sealing ring.

3. The filter element assembly for a fuel filter according to claim 1 or 2, characterized in that: An annular baffle is integrally installed on the upper end cover at a position corresponding to the inner ring of the inner frame. The annular baffle stops on the inner ring at the top of the inner frame.

4. The filter element assembly for a fuel filter according to claim 1, characterized in that: The internal frame is made of perforated plate.

5. The filter element assembly for a fuel filter according to claim 1, characterized in that: The through holes are waist-shaped holes, and the long direction of the waist-shaped holes is arranged along the circumference of the central hole of the first extension. Several through holes are evenly distributed at the central hole of the first extension.

6. The filter element assembly for a fuel filter according to claim 1 or 5, characterized in that: The top of the central tube passes through the first extension to form a connector.

7. The filter element assembly for a fuel filter according to claim 1, characterized in that: The outer edge of the lower end cap is folded upward to form a first stop ring, and the inner ring of the first stop ring is in contact with the lower part of the outer circumference of the coalescing filter element; the inner edge of the second extension is folded upward to form a second stop ring, and the inner ring of the second stop ring is in contact with or close to the lower part of the central tube.

8. The filter element assembly for a fuel filter according to claim 1, characterized in that: The coalescing filter element is formed by pleating composite filter media or synthetic fiber filter media and ultrasonically welding the two ends along the pleating direction.

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