Diesel oil filter element with long service life

Abstract

The utility model relates to the technical field of diesel filters, and discloses a long-service-life diesel filter element which comprises an upper end cover and a lower end cover, a central pipe is bonded between the upper end cover and the lower end cover, the outer wall of the central pipe is wrapped by inner-layer filter paper, the outer wall of the inner-layer filter paper is wrapped by outer-layer filter paper of a folding structure, and the outer-layer filter paper of a folding structure is bonded between the upper end cover and the lower end cover. By means of the layered structure of the outer-layer filter paper and the inner-layer filter paper, particle impurities and water in diesel oil can be effectively separated and coalesced when passing through the filter element, the outer-layer filter paper firstly filters the particle impurities, tiny emulsified water drops are coalesced into large water drops, and the large water drops are filtered out through the inner-layer filter paper. The inner layer filter paper further coalesces large water drops into larger water drops, the water filter screen effectively intercepts the water drops, water is prevented from entering a fuel system, it is guaranteed that the water separation capacity of the filter element in the whole life cycle is kept efficient, and stable operation of the engine fuel system is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel oil filter technical field especially relates to a long life diesel oil filter element. BACKGROUND

[0002] With the increasingly strict global environmental protection standard, especially the increasing requirement of diesel engine to emission, the performance of diesel oil filter and filter element also faces higher and higher requirement. The main function of diesel oil filter is to filter the impurities and moisture in diesel oil, to ensure that diesel oil reaches the clean and qualified standard when entering engine, thereby guaranteeing the stable operation and long life of engine. In diesel engine, especially in heavy machine application, the performance of filter element is very important. In the actual use process of traditional diesel oil filter element, the following problems often exist.

[0003] For diesel engine, especially heavy machine, the conventional structure diesel oil filter element in the market is difficult to meet the long life in the true sense, that is, the water separation efficiency is stable in the whole life cycle to meet the requirement of engine fuel system, and also meets the requirement of low flow resistance, compact structure, light weight and other aspects. UTILITY MODEL CONTENTS

[0004] The utility model discloses a long life diesel oil filter element to solve the shortcomings in the prior art.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] A long life diesel oil filter element, including upper end cover and lower end cover, the upper end cover and lower end cover are bonded with the center tube, the outer wall of the center tube is wrapped with the inner layer filter paper, the outer wall of the inner layer filter paper is wrapped with the outer layer filter paper of folding structure, the inside of the center tube is provided with filter screen support and filter water net, the top of the filter screen support is provided with support step two, the top of the center tube is provided with support step one, and support step one and support step two contact and support.

[0007] Preferably, the top outer diameter of the filter screen support and the top inner diameter of the center tube are transitionally matched.

[0008] Preferably, the inner hole opening position of the upper end cover is provided with a retraction structure.

[0009] Preferably, the upper end of the upper end cover is connected with the filter upper shell, and the lower end of the lower end cover is connected with the filter lower shell.

[0010] Preferably, the upper end cover is bonded with the outer layer filter paper and the inner layer filter paper, and the lower end cover is bonded with the outer layer filter paper and the inner layer filter paper.

[0011] Preferably, a sealing ring I is sleeved at the circumference of the upper end cover for sealing connection with the upper shell of the filter to isolate the media before and after filtration.

[0012] Preferably, a sealing ring II is sleeved at the circumference of the lower end cover for sealing connection with the lower shell of the filter to isolate the media before and after filtration.

[0013] Preferably, the filter screen support and the filter screen are integrally injection molded.

[0014] Preferably, the inner layer filter paper and the center tube have the same height.

[0015] The beneficial effects of the utility model are:

[0016] 1. Stable filtration efficiency and water separation capacity: The filter core design ensures that particulate impurities and water in diesel fuel can be effectively separated and coalesced when passing through the filter core through the layered structure of the outer layer filter paper and the inner layer filter paper. The outer layer filter paper first filters particulate impurities and coalesces tiny emulsified water droplets into larger water droplets, and the inner layer filter paper further coalesces larger water droplets into even larger water droplets. The filter screen effectively intercepts these water droplets, preventing water from entering the fuel system and ensuring that the water separation capacity of the filter core remains efficient throughout its life cycle, ensuring stable operation of the engine fuel system.

[0017] 2. Low flow resistance design: By optimizing the fluid path and structure design of the filter core, the filter core achieves low flow resistance, avoiding the problem of traditional filter cores affecting engine performance due to excessive fluid resistance. Optimized fluid flow path makes diesel flow more smoothly, reducing resistance during fluid flow, which helps improve engine fuel economy and power output.

[0018] 3. Lightweight and compact structure: The filter core adopts a lightweight design with a compact structure, reducing unnecessary parts and weight, greatly reducing the overall weight of the filter core. This not only reduces production and transportation costs, but also optimizes the spatial layout of diesel engines, suitable for heavy machinery and other applications with strict requirements for weight and space.

[0019] 4. Excellent mechanical strength and durability: The consistency of the height of the center tube and the filter paper layer of the filter core, as well as the injection molded filter screen support and filter screen structure, improves the mechanical strength and durability of the filter core. The filter core is not prone to deformation or aging under high temperature, high pressure and long-term operation conditions, greatly extending the service life, reducing the replacement frequency and reducing maintenance costs.

[0020] 5. Efficient water separation and drainage: Through the precise design of the water separation function, the filter element can efficiently remove the water in the diesel fuel, avoiding damage to the engine fuel system. The efficient interception of the filter screen ensures that water droplets quickly settle to the bottom of the lower housing of the filter under the action of gravity and can be drained through the drain valve, ensuring the cleanliness and reliability of the fuel system.

[0021] 6. Simplified manufacturing and assembly process: The filter screen support and filter screen are integrated using injection molding technology, which not only improves production efficiency but also avoids the problems of looseness or poor connection that may occur during traditional assembly. The high consistency of the inner filter paper and the center tube simplifies the manufacturing and assembly process, ensuring accurate fitting and efficient operation of the filter element components.

[0022] 7. Reliable sealing performance: The upper end cover and the lower end cover are both provided with a sealing ring to ensure the sealing between the filter element and the filter housing during installation, isolating the pre-filter medium and the post-filter medium, avoiding cross-contamination between unfiltered diesel fuel and filtered diesel fuel, and improving the sealing and safety of the entire system. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 A structure diagram of a long-life diesel filter element is provided for the embodiments of the present application.

[0024] Figure 2 A local structure enlarged view of A in Figure 1

[0025] Figure 3 A top view structure diagram of the outer filter paper, inner filter paper, and filter screen in the long-life diesel filter element is provided for the embodiments of the present application.

[0026] Figure 4 A filter condition diagram of the long-life diesel filter element is provided for the embodiments of the present application.

[0027] In the figure: 1 - sealing ring one, 2 - upper end cover, 3 - outer filter paper, 4 - center tube, 5 - inner filter paper, 6 - filter screen support, 7 - filter screen, 8 - lower end cover, 9 - sealing ring two, 10 - inwardly retracted structure, 11 - support step one, 12 - support step two. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0029] Referring to Figures 1 to 4 ​The utility model provides a long -life diesel filter element, including upper end cover 2 and lower end cover 8, and the centre tube 4 is bonded between upper end cover 2 and lower end cover 8, the outer wall of centre tube 4 is wrapped with inner layer filter paper 5, the outer wall of inner layer filter paper 5 is wrapped with the outer layer filter paper 3 of folding structure, and the inside of centre tube 4 is provided with filter screen support 6 and filter screen 7, the top of filter screen support 6 is provided with support step two 12, the top of centre tube 4 is provided with support step one 11, and support step one 11 contacts with support step two 12 and supports.

[0030] Diesel flows into the filter element from the outer cylindrical surface of the filter element to the center direction, first passes through the outer layer filter paper 3, the outer layer filter paper 3 effectively filters the particulate impurities in diesel through its folding structure, and at the same time, can coalesce the tiny emulsified water droplets in diesel into larger water droplets during the filtration process; the larger water droplets flow to the inner layer filter paper 5 along with the diesel, after entering the inner layer filter paper 5, the inner layer filter paper 5 further coalesces the larger water droplets into larger water droplets, further improving the water separation effect; the diesel filtered by the inner layer filter paper 5 then flows to the filter screen 7, which can effectively intercept the water droplets coalesced into larger droplets. Since the density of water is greater than that of diesel, the intercepted water droplets will settle to the bottom of the lower shell of the filter under the action of gravity, ensuring that the water is effectively separated and accumulated at the bottom. The clean diesel after threefold filtration finally flows out of the filter element from the inside of the filter screen 7, and is discharged through the upper end cover 2. At the same time, the water droplets intercepted by the filter screen 7 settle to the bottom by gravity and are discharged through the drain valve, ensuring that the entire system continuously provides clean diesel and prevents water from entering the engine fuel system.

[0031] As a preferred embodiment of the utility model, the top outer diameter of the filter screen support 6 is transitionally fitted with the top inner diameter of the center tube 4, ensuring that the connection between the filter screen support 6 and the center tube 4 has precise transition fitting, which can effectively avoid looseness or gap between structures, providing higher sealing and stability. Through this transition fitting, the connection between the filter screen support 6 and the center tube 4 is more compact, enhancing the overall structural strength of the filter element and reducing the influence of vibration on the performance of the filter element.

[0032] In addition, the transition fitting can also optimize the flow path of the fluid, reduce the flow resistance, and ensure that the flow rate and distribution of diesel flowing inside the filter element are more uniform, which helps to improve the filtration efficiency and water separation effect of the filter element. This transition fitting design enables diesel to maintain a relatively stable flow rate when flowing through the outer layer filter paper 3, the inner layer filter paper 5, and the filter screen 7, avoiding incomplete filtration or reduced water separation efficiency due to uneven flow rate.

[0033] In summary, the transition fit of the outer diameter of the top of the filter screen support 6 and the inner diameter of the top of the center tube 4 not only enhances the structural stability of the filter element, ensuring that it is not easily loosened or prone to water leakage during operation, but also effectively optimizes the diesel flow path, improving overall filtration and water separation performance.

[0034] As a preferred embodiment of the present utility model, the inner hole opening position of the upper end cover 2 is provided with an inwardly recessed structure 10, which can effectively prevent the overflow of glue during the process, ensuring that the bonding process of the upper end cover 2 with the outer filter paper 3, the inner filter paper 5 and the center tube 4 is more accurate and stable. Specifically, the inwardly recessed structure 10 sets an inwardly recessed shape at the opening position of the inner hole of the upper end cover 2, which can form a physical barrier when the glue is applied, effectively limiting the overflow of glue during assembly, avoiding unnecessary contact of glue with filter materials or other components. This not only improves the process control accuracy in the production process, but also reduces the problem of loose bonding or contamination caused by glue overflow, thereby improving the overall quality and reliability of the filter element.

[0035] In addition, the inwardly recessed structure 10 optimizes the glue application area, ensuring that the glue is evenly distributed only on the required contact surface, enhancing the bonding strength and sealing performance of the glued parts. In this way, not only does it ensure that the filter element maintains stable sealing performance during operation, avoiding cross-contamination of diesel and water, but it also improves the bonding effect between the upper end cover and other components (such as filter paper and center tube), thereby prolonging the service life of the filter element.

[0036] The design of this inwardly recessed structure 10 also helps to improve production efficiency, as it reduces the need for manual intervention and forms a more standardized control method during production, reducing fluctuations in product quality caused by improper human operation.

[0037] In summary, the inwardly recessed structure 10 at the inner hole opening position of the upper end cover 2 effectively prevents glue overflow during the process, not only improving the bonding quality and overall sealing performance of the filter element, but also optimizing the production process to improve the reliability and stability of the filter element, ensuring its efficient filtration and water separation performance in actual use.

[0038] As a preferred embodiment of the present utility model, the upper end of the upper end cover 2 is connected to the upper shell of the filter, and the lower end of the lower end cover 8 is connected to the lower shell of the filter.

[0039] As a preferred embodiment of the present utility model, the upper end cover 2 is bonded with the outer filter paper 3 and the inner filter paper 5, and the lower end cover 8 is bonded with the outer filter paper 3 and the inner filter paper 5, through precise application and firm bonding of the adhesive, ensuring the tight combination between the various components of the filter element. This bonding method can effectively prevent the filter paper from loosening, falling off or leaking due to pressure, vibration or temperature changes during use, ensuring the efficiency and safety of the filtration process.

[0040] By bonding the upper end cover 2 and the lower end cover 8, the filter element forms a complete sealing structure, effectively preventing impurities and water in diesel from leaking during filtration. This sealing design not only enhances the water separation effect of the filter element, but also ensures that the filtration medium (such as diesel and water) is isolated from the external environment, avoiding contamination of other parts of the filter or the engine fuel system, improving the reliability and stability of filtration.

[0041] Not only does it strengthen the overall structural stability and sealing of the filter element, but it also optimizes the process control during production, ensuring stable and durable filtration performance. This precise bonding design plays a crucial role in improving the durability, reliability, and filtration effect of the filter element, meeting the technical requirements of efficient filtration and water separation.

[0042] As a preferred embodiment of the present application, a sealing ring one 1 is provided at the circumference of the upper end cover 2 for sealing connection with the upper shell of the filter, isolating the medium before and after filtration.

[0043] The sealing ring one 1 is provided at the circumference of the upper end cover 2, forming a complete sealing structure with the upper shell of the filter. This sealing structure effectively prevents diesel or water from leaking during filtration, avoiding the entry of unfiltered diesel or water into the external environment of the filter, ensuring the working efficiency and safety of the entire filtration system. The use of the sealing ring one 1 can greatly improve the sealing effect, avoiding contamination or fluid leakage problems caused by poor sealing, thereby ensuring the stability of the filter element during long-term use.

[0044] The sealing ring one 1 is made of high-quality sealing material, capable of withstanding pressure fluctuations inside the diesel system and long-term contact with diesel and water and other chemical media. By selecting materials resistant to high temperature and corrosion, the sealing ring one 1 can maintain good elasticity and sealing performance during the use of the filter element, avoiding aging, deformation, or failure due to temperature changes or long-term use. This high-performance sealing ring not only improves the durability of the filter element, but also ensures that the filter element can still maintain its efficient filtration and water separation function in harsh working environments.

[0045] The sealing ring one 1 at the circumference of the upper end cover 2 is precisely designed in cooperation with the upper shell of the filter, ensuring automatic positioning and uniform compression between the sealing ring and the upper shell. When the filter element is assembled into the filter, the sealing ring one 1 can be uniformly compressed between the upper shell and the upper end cover, forming a uniform sealing surface, avoiding oil or water leakage problems caused by uneven sealing. This precise design not only simplifies the production and assembly process, but also improves the assembly precision, reducing the risk of sealing failure caused by human operation errors.

[0046] The sealing ring 1 forms a barrier between the filter element and the upper housing of the filter, ensuring strict separation between unfiltered diesel and filtered diesel. This separation is crucial in preventing the spread of contaminants into unfiltered diesel, ensuring that the filter element remains clean at all times and preventing contaminants from re-entering the diesel system, affecting the normal operation of the engine. Additionally, this separation reduces the mixing of water and diesel during operation, preventing water from directly entering the fuel system.

[0047] The effective sealing of the sealing ring 1 ensures the separation of media inside and outside the filter element, preventing the mixing of water, particulate matter, or other impurities in diesel with unfiltered diesel, enhancing the overall filtration efficiency of the filter element. This not only improves the filtration effect of the filter element but also prolongs its service life, as it reduces the burden of excessive water or contaminants on the materials inside the filter element, slowing down the wear and tear of the filter element and ensuring its long-term stable operation.

[0048] As a key component connecting the filter element and the filter housing, the sealing ring 1 enhances the overall structural stability between the filter element and the upper housing of the filter. During long-term use, the elasticity and sealing ability of the sealing ring can effectively resist the influence of external mechanical vibration, temperature changes, and other factors, maintaining the close connection between the filter element and the filter, and avoiding leakage or contamination problems caused by loose connection.

[0049] As a preferred embodiment of the present utility model, the sealing ring 2 9 is provided at the circumference of the lower end cover 8 for sealing connection with the lower housing of the filter, isolating the media before and after filtration. By providing efficient sealing and reliable isolation effect, it ensures that the media before and after filtration does not cross-contaminate, improving the filtration efficiency and stability of the entire filter element. The sealing ring 2 9 not only resists high pressure and corrosion, but also optimizes the diesel flow path, reducing the risk of leakage, thereby prolonging the service life of the filter element and maintaining high filtration performance throughout the service life. Through this design, the filter element can operate stably under various working conditions, ensuring efficient, safe, and long-term operation of the engine fuel system.

[0050] As a preferred embodiment of the present utility model, the filter screen support 6 and the water filter screen 7 are integrally injection molded structures. By integrally injection molding the filter screen support 6 and the water filter screen 7, a unified and strong structure is formed. Compared with the traditional method of manufacturing the support and filter screen separately and then assembling them, this integrated design significantly improves the structural strength and stability of the overall component. During the injection molding process, the combination of the support and the filter screen is seamless, which avoids the problems of loose assembly, misalignment, or failure that may occur in the traditional assembly process, thereby ensuring the stability of the water filter screen 7 during long-term use and reducing the risk of damage or loosening of the component due to factors such as vibration, pressure changes, or temperature fluctuations.

[0051] One-piece injection molding simplifies the manufacturing process of the filter screen support 6 and the water filter screen 7 during production. Through the injection molding process, the support and filter screen do not need to be separately manufactured and assembled during production, greatly improving production efficiency and reducing labor costs and material waste during production. This process also ensures the precise fit between the filter screen support and the water filter screen of each filter element, improving batch consistency and avoiding quality instability problems caused by assembly errors. Especially for mass production, the efficiency and consistency of injection molding are particularly prominent.

[0052] The main function of the water filter screen 7 is to intercept the water droplets coalesced in the filter element and remove the water by gravity. Through the structure of one-piece injection molding, the filter screen support 6 and the water filter screen 7 can better cooperate to achieve a more efficient water separation effect. The surface and structure design of the water filter screen 7 can effectively improve the water droplet capture ability and retain larger water droplets in the water filter screen, while clean diesel smoothly passes through the water filter screen into the diesel system. This integrated design ensures that water droplets do not reverse osmosis or leak when passing through the water filter screen 7, thereby improving the efficiency of water separation and reducing the risk of failure that may occur due to water entering the fuel system.

[0053] In traditional designs, the filter screen support 6 and the water filter screen 7 often need to be fixed through methods such as gluing, welding, or mechanical connection. These connection methods may loosen or age during use due to factors such as pressure and temperature, affecting overall performance. After adopting the one-piece injection molding structure, the connection between the filter screen support 6 and the water filter screen 7 becomes more secure and stable, avoiding potential problems caused by traditional connection methods. Since there are no additional connection components, the possible contact point wear and structural fatigue are reduced, further improving the durability and reliability of the filter element during long-term use.

[0054] The integrated filter screen support 6 and water filter screen 7 design makes the filter element structure more compact, reducing the redundant space in traditional multi-component designs. Due to the integration of the support and filter screen, the overall filter element can be designed more compactly, thereby saving space and improving assembly efficiency. At the same time, the simplified design allows the overall weight of the filter element to be reduced, which is beneficial to the lightweight requirements of the filter, especially suitable for heavy-duty engines or space-limited application scenarios.

[0055] The integrated injection molding structure allows for more uniform material selection for the filter screen support 6 and the water filter screen 7, typically using high-wear-resistant and high-corrosion-resistant plastic materials that can withstand high temperatures, chemical corrosion, and mechanical impact in the harsh environment of diesel systems. Compared with traditional split structures, the integrally formed structure can effectively avoid performance degradation due to aging, deformation, or corrosion of the connection parts. Through the selection of high-quality materials, the durability of the water filter screen 7 is significantly improved, and excellent filtering effect can be maintained for a long time.

[0056] After adopting the injection molding process, the design of the filter screen support 6 and the water filter screen 7 is more flexible, and can be accurately customized according to different use requirements and design requirements. For example, the pore size, filter layer number of the water filter screen 7 and the structure of the support can be adjusted according to actual needs, so that each filter element can be optimized for specific diesel filtration requirements. This flexibility enables the product to achieve the best filtering effect in different diesel engine applications and can quickly adapt and adjust to market demand.

[0057] As a preferred embodiment of the present application, the height of the inner layer filter paper 5 and the center tube 4 is the same, which ensures that the inner layer filter paper 5 completely covers the center tube 4, and there is no excess gap or uneven gap between the inner layer filter paper 5 and the center tube 4. In this way, the inner layer filter paper 5 can be more firmly attached to the center tube 4, reducing the possibility of air or unfiltered medium flowing into the inner layer filter paper 5. Its close fit also effectively avoids the phenomenon of material leakage between the inner and outer filter paper layers, thereby improving the filtering precision and water separation effect of the entire filter element.

[0058] The inner layer filter paper 5, as an important filtering part of the filter element, its height consistency with the center tube 4 helps to ensure the uniformity of the filtering medium flowing in the filter element. When the filtering medium enters the filter element from the outside, it is first coarsely filtered by the outer layer filter paper, and when it passes through the inner layer filter paper, larger water droplets and impurities in the liquid are further filtered and coalesced. By ensuring the height consistency of the inner layer filter paper and the center tube, deformation or collapse of the inner layer filter paper can be avoided, thereby ensuring that the coalescence effect of water droplets is not affected, and ultimately improving the overall water separation effect and filtering efficiency of the filter element.

[0059] Due to the height consistency of the inner layer filter paper and the center tube, the fluid flow path inside the entire filter element is optimized, reducing local stagnation or flow resistance fluctuations in fluid flow. This consistent design reduces the phenomenon of increased local resistance caused by deformation of the inner layer filter paper, thereby maintaining the stability of fluid flow inside the filter element, reducing the flow resistance (flow resistance) of the filter element during operation, improving the performance of the filter element during long-term use, and avoiding the problem of premature failure of the filter element.

[0060] The height of the inner layer filter paper 5 is the same as that of the center tube 4, which ensures the stability of the entire filter core structure and avoids the inner layer filter paper from warping or sagging due to insufficient support. If the inner layer filter paper deforms during long-term filtration, it will not only lead to a decline in filtration efficiency, but also may cause damage or rupture of the filter core structure. Through this design, the inner layer filter paper can be uniformly supported, avoiding performance degradation caused by uneven stress, and enhancing the durability and service life of the filter core.

[0061] The height consistency of the inner layer filter paper 5 and the center tube 4 also makes the assembly of the entire filter core more accurate. During assembly, the accurate position and height of the inner layer filter paper can ensure a sealed fit with other components, avoiding poor sealing or fluid leakage problems caused by dimensional errors. In addition, the precise matching between the inner layer filter paper and the center tube ensures smooth flow of the filtered fluid, avoiding unnecessary medium flow obstruction or leakage.

[0062] The above is only the preferred specific implementation of the present application, but the protection scope of the present application is not limited to this. Any skilled person in the art, according to the technical scheme and the inventive concept of the present application, can make equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A long-life diesel fuel filter element, characterized in that, It includes an upper end cap (2) and a lower end cap (8), and a central tube (4) is bonded between the upper end cap (2) and the lower end cap (8). The outer wall of the central tube (4) is wrapped with an inner layer of filter paper (5), and the outer wall of the inner layer of filter paper (5) is wrapped with an outer layer of filter paper (3) with a folded structure. The interior of the central tube (4) is provided with a filter screen support (6) and a water filter screen (7). The top of the filter support (6) is provided with a second support step (12), and the top of the central tube (4) is provided with a first support step (11). The first support step (11) contacts and supports the second support step (12).

2. The long-life diesel filter element according to claim 1, characterized in that, The top outer diameter of the filter support (6) is fitted with the top inner diameter of the central tube (4).

3. The long-life diesel filter element according to claim 1, characterized in that, The upper end cap (2) has an inward-shrinking structure (10) at the opening position of the inner hole.

4. The long-life diesel filter element according to claim 1, characterized in that, The upper end of the upper cover (2) is connected to the upper housing of the filter, and the lower end of the lower cover (8) is connected to the lower housing of the filter.

5. A long-life diesel filter element according to claim 1, characterized in that, The upper end cap (2) is bonded to the outer layer filter paper (3) and the inner layer filter paper (5), and the lower end cap (8) is bonded to the outer layer filter paper (3) and the inner layer filter paper (5).

6. A long-life diesel filter element according to claim 1, characterized in that, A sealing ring (1) is fitted around the circumference of the upper end cover (2) for sealing connection with the upper housing of the filter.

7. A long-life diesel filter element according to claim 1, characterized in that, A sealing ring 2 (9) is fitted around the circumference of the lower end cover (8) for sealing connection with the lower housing of the filter.

8. A long-life diesel filter element according to claim 1, characterized in that, The filter support (6) and the water filter (7) are integrally injection molded structures.

9. A long-life diesel filter element according to any one of claims 1-8, characterized in that, The inner filter paper (5) and the central tube (4) are at the same height.

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