A composite filter element assembly and fuel filter

Abstract

The utility model discloses a kind of composite filter element assembly and fuel filter, it is related to fuel filtration technical field, including a center filter tube, the center filter tube is densely and uniformly distributed with several through holes, and it is covered with inside precision filter layer, middle dust-containing layer and outside coarse filter layer from inside to outside in turn;The middle dust-containing layer is embedded with the skeleton for reinforcing structural strength. In this way, outside coarse filter layer first intercepts large particle impurities, middle dust-containing layer utilizes its thickness and pore to accommodate a large number of medium particles, and finally by inside precision filter layer is filtered. This clear division of labor structure avoids that precision filter layer is blocked by large particle prematurely, significantly prolongs the service life of filter element, and maintains stable high filtration accuracy in whole life cycle;Skeleton embedded in middle dust-containing layer effectively enhances the overall structural strength of composite filter element assembly, ensures that filter layer does not collapse or deform when oil pressure fluctuates and impurity load increases, ensures the reliability of filtration.

Description

Technical Field

[0001] This utility model relates to the field of fuel filtration technology, and in particular to a composite filter element assembly and a fuel filter. Background Technology

[0002] A filter is a common filtration device, which can be broadly classified into gas filtration, liquid filtration, and dust filtration based on the medium being filtered. In fuel-powered equipment such as diesel engines, the fuel filter is a crucial device for ensuring fuel cleanliness, protecting precision engine components, and ensuring combustion efficiency. To protect the safety of the diesel engine and ensure fuel combustion efficiency, impurities in the fuel need to be removed through separation and filtration methods. These filters mainly include volumetric, self-cleaning, and manually cleaned types. Volumetric fuel filters are widely used in low-fuel-consumption equipment and offline filtration scenarios due to their simple structure and convenient maintenance.

[0003] However, most volumetric filter cartridges on the market are standard parts made of single filter paper or non-environmentally friendly synthetic materials, which have the following limitations: (1) Single filtration level: It is difficult to simultaneously take into account the dust holding capacity of large particles and the filtration accuracy of small particles, resulting in the filter cartridge being either easy to clog or having poor filtration effect; (2) Insufficient structural strength: Especially after containing a lot of impurities, the filter material is easy to deform and break under oil pressure, resulting in filtration failure.

[0004] Therefore, there is an urgent need for a composite filter element assembly and its fuel filter with high filtration efficiency, large dust holding capacity and good structural strength. Utility Model Content

[0005] To address the technical problems existing in the background art, this utility model proposes a composite filter element assembly and a fuel filter.

[0006] The present invention proposes a composite filter element assembly, comprising a central filter tube, wherein a plurality of through holes are densely and evenly distributed on the central filter tube, and the central filter tube is sequentially covered from the inside to the outside with an inner fine filter layer, a middle dust holding layer and an outer coarse filter layer; the middle dust holding layer is embedded with a skeleton for enhancing structural strength.

[0007] Preferably, the outer coarse filter layer is a cotton cloth cover, the middle dust-collecting layer is a hemp felt, and the inner fine filter layer is a filter paper.

[0008] Preferably, the two ends of the cotton cover are reversed, and its ends are pressed between the central filter tube and the filter paper, and fixed by a sealing head.

[0009] Preferably, the skeleton is a stainless steel mesh embedded inside the hemp felt layer.

[0010] Preferably, the filter paper is configured with a double-layer structure and its filtration accuracy is 5-20μm.

[0011] This utility model also proposes a fuel filter using any of the composite filter elements described above, including a filter housing, a filter cover, and a clean oil collection pipe assembly. The filter housing has a filter inlet on its side and a filter outlet at its bottom. The clean oil collection pipe assembly includes a clean oil collection pipe and a clamping nut on the clean oil collection pipe. The composite filter element assembly is sleeved on the outside of the clean oil collection pipe, and the sealing ring located at the top of the composite filter element assembly is axially compressed by tightening the clamping nut.

[0012] Preferably, the filter cover is connected to the filter cylinder by mounting bolts.

[0013] Preferably, the upper end of the clean oil collection pipe is a sealed structure.

[0014] In summary, this invention offers the following advantages: the outer coarse filter layer first intercepts large particulate impurities, the middle dust-holding layer utilizes its thickness and pores to accommodate a large number of medium-sized particles, and finally, the inner fine filter layer performs fine filtration. This clearly defined structure prevents the fine filter layer from being clogged by large particles prematurely, significantly extending the service life of the filter element and maintaining stable high filtration accuracy throughout its lifespan. The skeleton embedded in the middle dust-holding layer effectively enhances the overall structural strength of the composite filter element assembly, ensuring that the filter layer does not collapse or deform under oil pressure fluctuations and increased impurity load, thus guaranteeing filtration reliability.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a cross-sectional view of the composite filter element assembly according to an embodiment of the present utility model;

[0017] Figure 2 This is a partial cross-sectional view of the composite filter element assembly and fuel filter according to an embodiment of the present invention.

[0018] In the picture:

[0019] 1. Composite filter element assembly; 11. Cotton cloth cover; 12. Frame; 13. Hemp felt; 14. Filter paper; 15. Filter tube; 2. Filter cylinder; 21. Filter inlet; 22. Filter outlet; 3. Clean oil collection pipe assembly; 31. Clean oil collection pipe; 32. Compression nut; 33. Sealing ring; 4. Filter cover; 41. Mounting bolts. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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 this utility model, and should not be construed as limiting this utility model.

[0021] like Figure 1-2 As shown, the composite filter element assembly proposed in this embodiment includes a central filter tube 15, which has a number of through holes densely and evenly distributed on it, and is covered with an inner fine filter layer, a middle dust holding layer and an outer coarse filter layer from the inside to the outside; thus forming a gradient filtration channel from sparse to dense and from large to small. The middle dust holding layer is embedded with a skeleton 12 for enhancing the structural strength.

[0022] Specifically, the frame 12 is a stainless steel mesh embedded inside the felt layer. Its function is to provide radial support for the entire filter element, especially the middle layer with the largest dirt holding capacity, without significantly increasing flow resistance, thus preventing the filter element from being crushed.

[0023] In this way, the outer coarse filter layer first intercepts large particulate impurities, the middle dust-holding layer uses its thickness and pores to accommodate a large number of medium-sized particles, and finally, the inner fine filter layer performs fine filtration. This clearly defined structure avoids the fine filter layer from being blocked by large particles too early, significantly extending the service life of the filter element and maintaining a stable high filtration accuracy throughout its life cycle. The skeleton embedded in the middle dust-holding layer effectively enhances the overall structural strength of the composite filter element assembly 1, ensuring that the filter layer does not collapse or deform when oil pressure fluctuates and impurity load increases, thus guaranteeing the reliability of filtration.

[0024] Furthermore, the outer coarse filter layer is a cotton cloth cover 11, the middle dust-holding layer is a hemp felt 13, and the inner fine filter layer is a filter paper 14. The cotton cloth cover 11 first intercepts large particles of impurities, the hemp felt 13 uses its thickness and pores to hold a large number of medium-sized particles, and finally, the filter paper 14 performs fine filtration. The core filter materials [cotton cloth cover 11, hemp felt 12, and filter paper 14] are all natural fibers that are biodegradable or easily disposed of harmlessly. After disposal, they can be disposed of harmlessly by incineration or landfill, which conforms to the concept of green environmental protection and avoids the problem of secondary pollution to the environment caused by improper disposal of waste filter cartridges.

[0025] It should be noted that the extra-thick hemp felt layer is designed specifically for the distribution characteristics of fuel impurity particles. Its huge pore space can accommodate most of the impurities with a high volume ratio, demonstrating the advantages of volumetric filtration.

[0026] Furthermore, the two ends of the cotton cover 11 are reversed and pressed between the central filter tube 15 and the filter paper 14, and then secured by a sealing head. This method utilizes the tension of the material itself to achieve a tight fit between the layers, eliminating the need for chemical adhesives, resulting in a stable structure and environmental friendliness.

[0027] The filter paper 14 is designed with a double-layer structure and has a filtration accuracy of 5-20μm.

[0028] The manufacturing process of the composite filter element assembly in this embodiment is as follows:

[0029] a. Prepare a metal central filter tube 15 with dense through holes;

[0030] b. Wrap the double-layer filter paper 14, which serves as the inner fine filtration layer, around the outer periphery of the central filter tube 15;

[0031] c. Begin by winding the hemp felt 13, which serves as the intermediate dust-holding layer, around the outer layer of the filter paper 14. When the thickness reaches about 2 / 3, place the frame (stainless steel mesh) over the wound hemp felt 13, and then continue winding the remaining hemp felt 13, embedding and fixing the frame 12 within it.

[0032] d. The entire hemp felt layer is completely covered with a cotton cloth cover 11, which serves as the outer coarse filter layer;

[0033] e. End fixing: Turn one end of the cotton cloth cover 11 over and tighten it evenly so that its covering layer is pressed into the gap between the central filter tube 15 and the filter paper 14; then turn the other end over in the opposite direction, tighten it and press it in. Finally, use a cap to press and fix the end of the central filter tube 15, thereby forming a tightly structured and strong integrated composite filter element assembly 1.

[0034] This embodiment also proposes a fuel filter using the composite filter element assembly described in the above embodiments, including a filter housing 2, a filter cover 4, and a clean oil collection pipe assembly 3. The filter housing 2 has a filter inlet 21 on its side and a filter outlet 22 at its bottom. The clean oil collection pipe assembly 3 includes a clean oil collection pipe 31 and a clamping nut 32 on the clean oil collection pipe 31. The composite filter element assembly 1 is sleeved on the outside of the clean oil collection pipe 31. By tightening the clamping nut 32, the sealing ring 33 located at the top of the composite filter element assembly 1 is axially compressed. This achieves a reliable seal between the upper end of the composite filter element assembly 1 and the clean oil collection pipe 31, ensuring that unfiltered fuel cannot short-circuit into the clean oil side.

[0035] Furthermore, the filter cover 4 is connected to the upper opening of the filter housing 2 via mounting bolts 41. Loosening the mounting bolts 41 allows the filter cover 4 to be opened, enabling direct removal or replacement of the composite filter element assembly 1, making maintenance simple and quick.

[0036] It should be noted that the upper end of the clean oil collection pipe 31 is a sealed structure.

[0037] The assembly and operation process of the fuel filter in this embodiment is as follows:

[0038] a. Place the assembled composite filter element assembly 1 onto the clean oil collection pipe 31, ensuring that the through hole on the central filter pipe 15 is aligned with the oil inlet channel on the clean oil collection pipe 31;

[0039] b. Place a sealing ring 33 at the top of the composite filter element assembly 1, and then tighten the clamping nut 32 to press the sealing ring 33 and the composite filter element assembly 1 with axial pressure to achieve a reliable seal on the upper end face;

[0040] c. Place the collection tube assembly 3 containing the composite filter element assembly 1 into the filter housing 2, cover it with the filter cover 4, and tighten it with the mounting bolts 41 to complete the assembly of the entire fuel filter.

[0041] Working process: Fuel enters the filter cylinder 2 from the filter inlet 21. Under pressure, it passes through the cotton cloth sleeve 11 (coarse filter) -> hemp felt 13 (dust trap) -> filter paper 14 (fine filter) of the composite filter element assembly 1 in sequence. Impurities are intercepted step by step. Clean fuel enters the cavity of the central filter tube 15 and flows into the clean oil collection tube 31. Finally, it flows out from the filter outlet 22 and supplies the engine.

[0042] When the composite filter element assembly 1 needs to be replaced, simply loosen the mounting bolt 41, open the filter cover 4, and you can easily remove the old composite filter element assembly 1 and replace it with a new filter element.

[0043] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0045] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A composite filter element assembly, comprising a central filter tube (15), characterized in that, The central filter tube (15) has several through holes densely and evenly distributed, and it is covered with an inner fine filter layer, a middle dust-holding layer and an outer coarse filter layer from the inside to the outside; the middle dust-holding layer is embedded with a skeleton (12) for enhancing the structural strength.

2. The composite filter assembly according to claim 1, characterized in that, The outer coarse filter layer is made of cotton cloth (11), the middle dust-holding layer is made of hemp felt (13), and the inner fine filter layer is made of filter paper (14).

3. The composite filter element assembly according to claim 2, characterized in that, The two ends of the cotton cloth cover (11) are reversed and their ends are pressed between the central filter tube (15) and the filter paper (14) and fixed by the end cap.

4. The composite filter element assembly according to claim 2, characterized in that, The skeleton (12) is made of stainless steel mesh and embedded inside the hemp felt (13) layer.

5. The composite filter element assembly according to claim 2, characterized in that, The filter paper (14) is designed with a double-layer structure and has a filtration accuracy of 5-20μm.

6. A fuel filter using a composite filter element assembly as described in any one of claims 1-5, comprising a filter housing (2), a filter cover (4), and a clean oil collection pipe (31), characterized in that, The composite filter element assembly is sleeved on the outside of the clean oil collection pipe (31); a clamping nut (32) is provided on the clean oil collection pipe (31), and the sealing ring (33) located on the top of the composite filter element assembly is axially clamped by tightening the clamping nut (32).

7. The fuel filter according to claim 6, characterized in that, The filter cover (4) is connected to the filter cylinder (2) by mounting bolts (41).

8. The fuel filter according to claim 6, characterized in that, The upper end of the clean oil collection pipe (31) is a sealed structure.

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