Diesel filter with narrow upper and wide lower sealing groove structure

Abstract

The utility model belongs to diesel oil filter technical field, concretely relates to the upper narrow lower wide sealing groove structure diesel oil filter, including the center tube and base, the outside fixed connection of center tube has filter paper cylinder, the outside of filter paper cylinder is provided with reinforcing cage mechanism, the upper end of base is provided with upper narrow lower wide sealing groove, the inside slide connection of upper narrow lower wide sealing groove has upper narrow lower wide sealing washer, the upper end fixed connection of base has filter sleeve. The utility model discloses through the upper connecting rib and lower connecting rib and fix the connection of upper sleeve ring, middle sleeve ring and lower sleeve ring, so that the upper connecting rib and lower connecting rib, upper sleeve ring, middle sleeve ring and lower sleeve ring are wrapped the outside of filter paper cylinder, thereby increase the protection to filter paper cylinder, reduce the deformation of filter paper cylinder after long time to be soaked by oil and affect use, and through the setting of ring cover and bottom plate, the upper and lower two ends of filter paper cylinder are wrapped and reinforced respectively, thereby the upper and lower two ends and lateral wall of filter paper cylinder are wrapped and reinforced respectively.

Description

Technical Field

[0001] This utility model relates to the field of diesel filter technology, specifically a diesel filter with a sealing groove structure that is narrow at the top and wide at the bottom. Background Technology

[0002] Diesel fuel filters are the core filtration component of diesel engine fuel systems. They remove solid particles, gum, and moisture from diesel fuel through physical interception, preventing impurities from entering precision components such as high-pressure fuel pumps and injectors. Their structure includes filter elements made of filter paper, felt, or polymer materials. Some models integrate moisture and temperature sensors for real-time fuel condition monitoring. Based on maintenance needs, they are available in two types: replaceable filter elements and spin-on replacement filters, suitable for use in tractors, dump trucks, generator sets, and other equipment.

[0003] Patent publication number CN105508103A discloses a diesel fuel filter, including a housing and a filter element assembly disposed inside the housing. It also includes a flow guiding structure disposed between the housing and the filter element assembly, used to guide oil entering the housing to the inner wall surface of the housing. This diesel fuel filter, by providing a flow guiding structure inside the housing, directs diesel fuel and impurities entering the housing to the inner wall of the housing, allowing them to fall to the bottom of the housing by gravity. This prevents impurities in the fuel from adhering to the filter paper element and causing clogging of the filter element assembly, reducing the frequency of filter element assembly replacement and extending the service life of the diesel fuel filter.

[0004] Currently, there are no protective devices limiting the filter paper cartridge on the outside of diesel filters. This makes the filter paper cartridge prone to deformation and damage after prolonged use due to immersion in oil. This not only reduces the effectiveness of the filter paper cartridge but also shortens its service life. In addition, when oil flows into the diesel filter, it falls directly to the lower part of the filter. After prolonged use, the repeated impact of oil on the lower part of the filter can easily cause impact deformation and damage to the lower part of the filter. Furthermore, the oil cannot easily pass through the upper part of the filter paper cartridge for filtration. Utility Model Content

[0005] The purpose of this invention is to provide a diesel filter with a sealing groove structure that is narrow at the top and wide at the bottom, which solves the problems of reinforcing and protecting the filter paper cylinder and guiding the flow of oil.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a diesel filter with a narrow upper and wide lower sealing groove structure, comprising a central tube and a base. A filter paper cylinder is fixedly connected to the outside of the central tube, and a reinforcing cage mechanism is provided on the outside of the filter paper cylinder. A narrow upper and wide lower sealing groove is provided at the upper end of the base, and a narrow upper and wide lower sealing gasket is slidably connected inside the narrow upper and wide lower sealing groove. A filter sleeve is fixedly connected to the upper end of the base, and an end cap is slidably connected to the upper end of the filter sleeve. A flow guiding mechanism is provided at the lower end of the end cap, and the end cap has multiple flow holes and a flow outlet. A retaining ring is fixedly connected to the upper end of the end cap.

[0007] Preferably, the reinforcing cage mechanism includes a ring cover, the upper end of the central tube is fixedly connected to the ring cover, the lower end of the central tube is fixedly connected to the bottom plate, the outer side of the filter paper cylinder is slidably connected to an upper collar, the outer side of the filter paper cylinder is slidably connected to a middle collar, and the outer side of the filter paper cylinder is slidably connected to a lower collar.

[0008] Preferably, the upper end of the middle collar is fixedly connected with a plurality of upper connecting ribs, and the lower end of the middle collar is fixedly connected with a plurality of lower connecting ribs.

[0009] Preferably, the upper end of the upper connecting rib is fixedly connected to the lower end of the upper collar, and the lower end of the lower connecting rib is fixedly connected to the upper end of the lower collar.

[0010] Preferably, the flow guiding mechanism includes a flow guiding cover, a plurality of flow guiding covers are fixedly connected to the lower end of the end cover, a flow guiding ring is fixedly connected to the lower end of the flow guiding cover, and the flow guiding ring has a plurality of grooves.

[0011] Preferably, the flow guide ring is fixedly connected to a buffer mesh ring, and the buffer mesh ring is fixedly connected to multiple reinforcing blocks.

[0012] Preferably, one side of the reinforcing block is fixedly connected to the flow guide ring, and the flow guide ring is connected to the upper inner end of the filter sleeve.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses upper and lower connecting ribs to fix the upper, middle, and lower sleeve rings together, so that the upper and lower connecting ribs, the upper, middle, and lower sleeve rings wrap around the outside of the filter paper cylinder, thereby increasing the protection of the filter paper cylinder and reducing the deformation of the filter paper cylinder after being immersed in oil for a long time, which would affect its use. Moreover, through the setting of the ring cover and the bottom plate, the upper and lower ends of the filter paper cylinder are wrapped and reinforced respectively, thereby wrapping and reinforcing the upper and lower ends and the side wall of the filter paper cylinder respectively.

[0014] 2. This utility model uses a flow guide cover to suspend the flow guide ring at the lower end of the end cover, which can then catch the oil discharged from the flow hole. The oil then enters the interior of the groove, is filtered and buffered by the buffer mesh ring, and is discharged to the upper outer side of the filter paper cylinder. The oil then flows down the filter paper cylinder for filtration, avoiding direct impact on the upper end of the base and increasing the filtration effect of the oil. Attached Figure Description

[0015] Figure 1 This is a perspective view of the overall structure of this utility model; Figure 2 This is a partial three-dimensional structure of the present invention. Figure 1 ; Figure 3 This is a partial three-dimensional structure of the present invention. Figure 2 ; Figure 4 This is a partial three-dimensional structure of the present invention. Figure 3 ; Figure 5 This is a partial three-dimensional structure of the present invention. Figure 4 .

[0016] In the diagram: 1. Central tube; 2. Filter paper tube; 3. Reinforcing cage mechanism; 4. Base; 5. Sealing groove (narrower at the top, wider at the bottom); 6. Sealing gasket (narrower at the top, wider at the bottom); 7. Filter sleeve; 8. End cap; 9. Flow guiding mechanism; 10. Flow hole; 11. Flow outlet; 12. Baffle ring; 31. Ring cap; 32. Base plate; 33. Upper collar ring; 34. Middle collar ring; 35. Lower collar ring; 36. Upper connecting rib; 37. Lower connecting rib; 91. Flow guiding cover; 92. Flow guiding ring; 93. Groove; 94. Buffer mesh ring; 95. Reinforcing block. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5The diesel filter with a narrow upper and wide lower sealing groove structure includes a central tube 1 and a base 4. The base 4 blocks and limits the lower end of the base plate 32. A filter paper cylinder 2 is fixedly connected to the outside of the central tube 1, and the filter paper cylinder 2 is slidably sleeved on the outside of the central tube 1. The central tube 1 and the filter paper cylinder 2 are fixed together using existing technology. A reinforcing cage mechanism 3 is provided on the outside of the filter paper cylinder 2. The upper end of the base 4 has a narrow upper and wide lower sealing groove 5, which is used to engage a narrow upper and wide lower sealing gasket 6, sealing the installation of the base 4 and the base plate 32. The narrow upper and wide lower sealing groove 5 prevents the narrow upper and wide lower sealing gasket 6 from detaching from the interior of the groove, increasing the limiting stability and preventing the narrow upper and wide lower sealing gasket 6 from detaching from the groove 5. Inside the filter sleeve 7, a sealing gasket 6 with a narrow upper part and a wide lower part is slidably connected to the sealing groove 5. A filter sleeve 7 is fixedly connected to the upper end of the base 4. The filter sleeve 7 wraps around the central tube 1 and the filter paper cylinder 2. An end cap 8 is slidably connected to the upper end of the filter sleeve 7. The end cap 8 blocks the upper end of the central tube 1 and the filter paper cylinder 2. A flow guiding mechanism 9 is provided at the lower end of the end cap 8. The end cap 8 has multiple flow holes 10. The flow holes 10 facilitate the flow of oil to the outside of the filter paper cylinder 2 and the inside of the filter sleeve 7. The end cap 8 has an outlet 11. The outlet 11 facilitates the discharge of oil. A retaining ring 12 is fixedly connected to the upper end of the end cap 8. The retaining ring 12 isolates the flow holes 10 and the outlet 11.

[0019] Please see Figure 1 , Figure 2 , Figure 4 , Figure 5 The reinforcing cage mechanism 3 includes a ring cover 31. The upper end of the central tube 1 is fixedly connected to the ring cover 31, which limits the upper ends of the central tube 1 and the filter paper cylinder 2. The lower end of the central tube 1 is fixedly connected to a base plate 32, which also limits the lower ends of the central tube 1 and the filter paper cylinder 2. An upper collar 33 is slidably connected to the outer side of the filter paper cylinder 2, a middle collar 34 is slidably connected to the outer side of the filter paper cylinder 2, and a lower collar 35 is slidably connected to the outer side of the filter paper cylinder 2. 33. The middle collar 34 and the lower collar 35 are respectively used to wrap and reinforce the outside of the filter paper tube 2. The upper end of the middle collar 34 is fixedly connected with multiple upper connecting ribs 36, and the lower end of the middle collar 34 is fixedly connected with multiple lower connecting ribs 37. Through the setting of the upper connecting ribs 36 and the lower connecting ribs 37, the upper collar 33, the middle collar 34 and the lower collar 35 are connected respectively. The upper end of the upper connecting rib 36 is fixedly connected to the lower end of the upper collar 33, and the lower end of the lower connecting rib 37 is fixedly connected to the upper end of the lower collar 35.

[0020] Please see Figure 1 , Figure 2 , Figure 3The flow guiding mechanism 9 includes a flow guiding cover 91. Multiple flow guiding covers 91 are fixedly connected to the lower end of the end cover 8. The flow guiding ring 92 is suspended by the flow guiding cover 91. The flow guiding ring 92 is fixedly connected to the lower end of the flow guiding cover 91. The flow guiding ring 92 has multiple grooves 93. The grooves 93 facilitate the flow guidance of oil. The flow guiding ring 92 is fixedly connected to a buffer mesh ring 94. The buffer mesh ring 94 filters the oil. Multiple reinforcing blocks 95 are fixedly connected to the buffer mesh ring 94. The reinforcing blocks 95 reinforce the buffer mesh ring 94. One side of the reinforcing block 95 is fixedly connected to the flow guiding ring 92. The flow guiding ring 92 is connected to the upper end of the inside of the filter sleeve 7.

[0021] The specific implementation process of this utility model is as follows: the oil flows through multiple flow holes 10 to the outside of the filter paper cylinder 2 and the upper inside of the filter sleeve 7. Then, the oil flows through the guide cover 91 to the inside of the groove 93. Then, it is filtered and buffered by the buffer mesh ring 94 to reduce the impact force on the filter paper cylinder 2. Then, the oil is filtered from top to bottom along the filter paper cylinder 2. The dirt inside the oil flows through the filter paper cylinder 2 and flows into the drain groove of the central tube 1 and enters the interior of the central tube 1. Then, it is discharged through the upper end of the central tube 1 and the outlet 11. The filter paper cylinder 2 is wrapped by an upper collar 33, a middle collar 34 and a lower collar 35. The upper collar 33, the middle collar 34 and the lower collar 35 are assembled and connected by multiple upper connecting ribs 36 and lower connecting ribs 37, thereby increasing the protection of the outside of the filter paper cylinder 2, reducing the damage caused by long-term immersion in oil, and increasing the performance and service life of the filter paper cylinder 2.

[0022] The filter mainly consists of an internal core component and an external housing component. The internal core component is centered on a central tube 1, which is made of corrosion-resistant metal or high-strength composite material. Multiple radial oil inlet holes (not shown separately in the diagram) are precisely cut into its wall and integrated into the structure, serving as a collection channel for filtered clean diesel fuel. A filter paper cartridge 2 is fixed to the outside of the central tube 1 using a high-strength adhesive or hot-melt process. It is composed of multiple layers of filter paper of different precision and materials, such as glass fiber, plant fiber, or synthetic fiber, wound together to form a deep filtration structure. The external housing component includes a base 4, a filter sleeve 7, and end caps 8, providing a sealed cavity and external connection interface for the internal components.

[0023] The ring cap 31 and the base plate 32 are rigidly connected to the upper and lower ends of the central tube 1, respectively, forming a rigid clamping force on the filter paper cylinder 2 in the axial direction. This is not merely a simple physical limitation; its core function is to apply pre-tightening force. During assembly, appropriate pressure is applied to press the ring cap and base plate against the end face of the filter paper cylinder, generating an initial axial compressive stress. This pre-tightening force effectively counteracts the tension caused by the diesel pressure acting on the end face of the filter paper cylinder, resulting in axial expansion, and compresses the filter paper layers more tightly, significantly improving the bonding strength and anti-delamination ability between the filter paper layers.

[0024] The upper ring 33, the middle ring 34 and the lower ring 35 are arranged equidistantly or in a mechanically optimal distribution along the axial direction of the filter paper tube 2. They are welded or integrally cast into a rigid spatial truss structure, namely the "reinforced cage", by the radially evenly distributed upper connecting ribs 36 and lower connecting ribs 37.

[0025] Uniform Load Distribution and Suppression of Bulging: When diesel pressure acts on the inner wall of the filter paper cylinder 2, attempting to cause it to expand radially and create a "bulging" effect, the collar structure of the reinforcing cage acts as an external constraint ring, uniformly absorbing and distributing the expansion force to multiple connecting ribs. This design transforms localized high stress concentration into uniform stress distributed along the circumference of the collar and the axial direction of the connecting ribs, greatly suppressing excessive deformation at any point on the filter paper cylinder. This allows it to maintain a near-perfect circular cross-section throughout its entire lifespan, ensuring uniformity in the filtration gap and thus maintaining stable filtration accuracy and flow rate.

[0026] Overall rigidity and fatigue resistance: The cage-like frame, composed of collars and connecting ribs, has a moment of inertia much greater than that of a single filter paper tube. This gives the entire filter element assembly higher bending and torsional stiffness. In the vibration environment of vehicle operation or under severe diesel pressure fluctuations, this reinforced cage can effectively resist alternating stress, prevent the filter paper material from being damaged by fatigue, and fundamentally extend the structural life of the filter element.

[0027] Three-dimensional protection: The reinforcing cage, together with the upper and lower end caps and the bottom plate, forms a fully enclosed three-dimensional reinforced frame. This frame not only constrains the filter paper cylinder from the outside, but the connection between its upper and lower ends and the caps and bottom plate also forms a complete force transmission path. This efficiently transmits and disperses the complex loads, internal pressure, vibrations, and impacts on the filter paper cylinder to the more robust central tube and shell, achieving "all-round close protection" for the fragile filter paper medium.

[0028] Fluid sealing dynamics principle of sealing structures 5 and 6 (narrower at the top and wider at the bottom) The upper narrow and lower wide sealing groove 5 on the base 4 and the corresponding upper narrow and lower wide sealing gasket 6 constitute the dynamic adaptive sealing system of this device.

[0029] Geometric advantages: The trapezoidal cross-section of the sealing groove, narrower at the top and wider at the bottom, creates a gradually expanding accommodating space. The gasket, in its free state, has a cross-section slightly larger than the groove opening; during installation, it is compressed into the groove, generating initial contact stress and achieving a static seal.

[0030] Self-tightening effect and pressure activation: The core principle lies in "pressure-activated self-reinforcing seal". When the internal working pressure P of the filter increases, the pressurized diesel medium will seep into or act on the inner inclined surface of the sealing gasket 6. Due to the narrow top and wide bottom structure of the groove, the pressure P generates a vertical component force Fn on the inclined surface of the gasket. Fn can be further decomposed into a radially outward component force Fr. This radial component force Fr will force the gasket material to expand and compress further towards the wider bottom area of ​​the groove wall. The higher the pressure, the greater the radial compression force generated, and the sealing specific pressure will automatically increase accordingly. This perfectly solves the drawback of traditional rectangular sealing grooves where the gasket may "extrude" or "gap bite" under high pressure or pressure pulsation, leading to leakage, and achieves a reliable seal that "tightens with pressure", which is especially suitable for diesel engines with a wide operating pressure range and pressure shock conditions.

[0031] 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 diesel filter with a sealing groove structure that is narrow at the top and wide at the bottom, comprising a central tube (1) and a base (4), characterized in that: A filter paper cylinder (2) is fixedly connected to the outside of the central tube (1). A reinforcing cage mechanism (3) is provided on the outside of the filter paper cylinder (2). A sealing groove (5) with a narrow upper part and a wide lower part is opened at the upper end of the base (4). A sealing gasket (6) with a narrow upper part and a wide lower part is slidably connected inside the sealing groove (5). A filter sleeve (7) is fixedly connected to the upper end of the base (4). An end cap (8) is slidably connected to the upper end of the filter sleeve (7). A flow guiding mechanism (9) is provided at the lower end of the end cap (8). A plurality of flow holes (10) are opened on the end cap (8). A flow outlet (11) is opened on the end cap (8). A retaining ring (12) is fixedly connected to the upper end of the end cap (8).

2. The diesel filter with a narrow upper and wide lower sealing groove structure according to claim 1, characterized in that: The reinforcing cage mechanism (3) includes a ring cover (31), the upper end of the central tube (1) is fixedly connected to the ring cover (31), the lower end of the central tube (1) is fixedly connected to the bottom plate (32), the outer side of the filter paper tube (2) is slidably connected to the upper collar (33), the outer side of the filter paper tube (2) is slidably connected to the middle collar (34), and the outer side of the filter paper tube (2) is slidably connected to the lower collar (35).

3. The diesel filter with a narrow upper and wide lower sealing groove structure according to claim 2, characterized in that: The upper end of the middle collar (34) is fixedly connected with a plurality of upper connecting ribs (36), and the lower end of the middle collar (34) is fixedly connected with a plurality of lower connecting ribs (37).

4. The diesel filter with a narrow upper and wide lower sealing groove structure according to claim 3, characterized in that: The upper end of the upper connecting rib (36) is fixedly connected to the lower end of the upper collar (33), and the lower end of the lower connecting rib (37) is fixedly connected to the upper end of the lower collar (35).

5. The diesel filter with a narrow upper and wide lower sealing groove structure according to claim 1, characterized in that: The flow guiding mechanism (9) includes a flow guiding cover (91), and a plurality of flow guiding covers (91) are fixedly connected to the lower end of the end cover (8). A flow guiding ring (92) is fixedly connected to the lower end of the flow guiding cover (91), and the flow guiding ring (92) has a plurality of grooves (93).

6. The diesel filter with a narrow upper and wide lower sealing groove structure according to claim 5, characterized in that: The flow guide ring (92) is fixedly connected to a buffer mesh ring (94), and the buffer mesh ring (94) is fixedly connected to multiple reinforcing blocks (95).

7. The diesel filter with a sealing groove structure that is narrower at the top and wider at the bottom according to claim 6, characterized in that: One side of the reinforcing block (95) is fixedly connected to the guide ring (92), and the guide ring (92) is connected to the upper inside of the filter sleeve (7).

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